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>
40 #include "module-verify.h"
45 #define DEBUGP(fmt , a...)
48 #ifndef ARCH_SHF_SMALL
49 #define ARCH_SHF_SMALL 0
52 /* If this is set, the section belongs in the init part of the module */
53 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
55 /* Protects module list */
56 static spinlock_t modlist_lock = SPIN_LOCK_UNLOCKED;
58 /* List of modules, protected by module_mutex AND modlist_lock */
59 static DECLARE_MUTEX(module_mutex);
60 static LIST_HEAD(modules);
62 static DECLARE_MUTEX(notify_mutex);
63 static struct notifier_block * module_notify_list;
65 int register_module_notifier(struct notifier_block * nb)
69 err = notifier_chain_register(&module_notify_list, nb);
73 EXPORT_SYMBOL(register_module_notifier);
75 int unregister_module_notifier(struct notifier_block * nb)
79 err = notifier_chain_unregister(&module_notify_list, nb);
83 EXPORT_SYMBOL(unregister_module_notifier);
85 /* We require a truly strong try_module_get() */
86 static inline int strong_try_module_get(struct module *mod)
88 if (mod && mod->state == MODULE_STATE_COMING)
90 return try_module_get(mod);
93 /* A thread that wants to hold a reference to a module only while it
94 * is running can call ths to safely exit.
95 * nfsd and lockd use this.
97 void __module_put_and_exit(struct module *mod, long code)
102 EXPORT_SYMBOL(__module_put_and_exit);
104 /* Find a module section: 0 means not found. */
105 static unsigned int find_sec(Elf_Ehdr *hdr,
107 const char *secstrings,
112 for (i = 1; i < hdr->e_shnum; i++)
113 /* Alloc bit cleared means "ignore it." */
114 if ((sechdrs[i].sh_flags & SHF_ALLOC)
115 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
120 /* Provided by the linker */
121 extern const struct kernel_symbol __start___ksymtab[];
122 extern const struct kernel_symbol __stop___ksymtab[];
123 extern const struct kernel_symbol __start___ksymtab_gpl[];
124 extern const struct kernel_symbol __stop___ksymtab_gpl[];
125 extern const unsigned long __start___kcrctab[];
126 extern const unsigned long __start___kcrctab_gpl[];
128 #ifndef CONFIG_MODVERSIONS
129 #define symversion(base, idx) NULL
131 #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL)
134 /* Find a symbol, return value, crc and module which owns it */
135 static unsigned long __find_symbol(const char *name,
136 struct module **owner,
137 const unsigned long **crc,
143 /* Core kernel first. */
145 for (i = 0; __start___ksymtab+i < __stop___ksymtab; i++) {
146 if (strcmp(__start___ksymtab[i].name, name) == 0) {
147 *crc = symversion(__start___kcrctab, i);
148 return __start___ksymtab[i].value;
152 for (i = 0; __start___ksymtab_gpl+i<__stop___ksymtab_gpl; i++)
153 if (strcmp(__start___ksymtab_gpl[i].name, name) == 0) {
154 *crc = symversion(__start___kcrctab_gpl, i);
155 return __start___ksymtab_gpl[i].value;
159 /* Now try modules. */
160 list_for_each_entry(mod, &modules, list) {
162 for (i = 0; i < mod->num_syms; i++)
163 if (strcmp(mod->syms[i].name, name) == 0) {
164 *crc = symversion(mod->crcs, i);
165 return mod->syms[i].value;
169 for (i = 0; i < mod->num_gpl_syms; i++) {
170 if (strcmp(mod->gpl_syms[i].name, name) == 0) {
171 *crc = symversion(mod->gpl_crcs, i);
172 return mod->gpl_syms[i].value;
177 DEBUGP("Failed to find symbol %s\n", name);
181 /* Find a symbol in this elf symbol table */
182 static unsigned long find_local_symbol(Elf_Shdr *sechdrs,
183 unsigned int symindex,
188 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
190 /* Search (defined) internal symbols first. */
191 for (i = 1; i < sechdrs[symindex].sh_size/sizeof(*sym); i++) {
192 if (sym[i].st_shndx != SHN_UNDEF
193 && strcmp(name, strtab + sym[i].st_name) == 0)
194 return sym[i].st_value;
199 /* Search for module by name: must hold module_mutex. */
200 static struct module *find_module(const char *name)
204 list_for_each_entry(mod, &modules, list) {
205 if (strcmp(mod->name, name) == 0)
212 /* Number of blocks used and allocated. */
213 static unsigned int pcpu_num_used, pcpu_num_allocated;
214 /* Size of each block. -ve means used. */
215 static int *pcpu_size;
217 static int split_block(unsigned int i, unsigned short size)
219 /* Reallocation required? */
220 if (pcpu_num_used + 1 > pcpu_num_allocated) {
221 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2,
226 memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated);
227 pcpu_num_allocated *= 2;
232 /* Insert a new subblock */
233 memmove(&pcpu_size[i+1], &pcpu_size[i],
234 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
237 pcpu_size[i+1] -= size;
242 static inline unsigned int block_size(int val)
249 /* Created by linker magic */
250 extern char __per_cpu_start[], __per_cpu_end[];
252 static void *percpu_modalloc(unsigned long size, unsigned long align)
258 BUG_ON(align > SMP_CACHE_BYTES);
260 ptr = __per_cpu_start;
261 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
262 /* Extra for alignment requirement. */
263 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
264 BUG_ON(i == 0 && extra != 0);
266 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
269 /* Transfer extra to previous block. */
270 if (pcpu_size[i-1] < 0)
271 pcpu_size[i-1] -= extra;
273 pcpu_size[i-1] += extra;
274 pcpu_size[i] -= extra;
277 /* Split block if warranted */
278 if (pcpu_size[i] - size > sizeof(unsigned long))
279 if (!split_block(i, size))
283 pcpu_size[i] = -pcpu_size[i];
287 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
292 static void percpu_modfree(void *freeme)
295 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
297 /* First entry is core kernel percpu data. */
298 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
300 pcpu_size[i] = -pcpu_size[i];
307 /* Merge with previous? */
308 if (pcpu_size[i-1] >= 0) {
309 pcpu_size[i-1] += pcpu_size[i];
311 memmove(&pcpu_size[i], &pcpu_size[i+1],
312 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
315 /* Merge with next? */
316 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
317 pcpu_size[i] += pcpu_size[i+1];
319 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
320 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
324 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
326 const char *secstrings)
328 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
331 static int percpu_modinit(void)
334 pcpu_num_allocated = 2;
335 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
337 /* Static in-kernel percpu data (used). */
338 pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
340 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
341 if (pcpu_size[1] < 0) {
342 printk(KERN_ERR "No per-cpu room for modules.\n");
348 __initcall(percpu_modinit);
349 #else /* ... !CONFIG_SMP */
350 static inline void *percpu_modalloc(unsigned long size, unsigned long align)
354 static inline void percpu_modfree(void *pcpuptr)
358 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
360 const char *secstrings)
364 static inline void percpu_modcopy(void *pcpudst, const void *src,
367 /* pcpusec should be 0, and size of that section should be 0. */
370 #endif /* CONFIG_SMP */
372 static int add_attribute(struct module *mod, struct kernel_param *kp)
374 struct module_attribute *a;
377 a = &mod->mkobj->attr[mod->mkobj->num_attributes];
378 a->attr.name = (char *)kp->name;
380 a->attr.mode = kp->perm;
382 retval = sysfs_create_file(&mod->mkobj->kobj, &a->attr);
384 mod->mkobj->num_attributes++;
388 #ifdef CONFIG_MODULE_UNLOAD
389 /* Init the unload section of the module. */
390 static void module_unload_init(struct module *mod)
394 INIT_LIST_HEAD(&mod->modules_which_use_me);
395 for (i = 0; i < NR_CPUS; i++)
396 local_set(&mod->ref[i].count, 0);
397 /* Hold reference count during initialization. */
398 local_set(&mod->ref[smp_processor_id()].count, 1);
399 /* Backwards compatibility macros put refcount during init. */
400 mod->waiter = current;
403 /* modules using other modules */
406 struct list_head list;
407 struct module *module_which_uses;
410 /* Does a already use b? */
411 static int already_uses(struct module *a, struct module *b)
413 struct module_use *use;
415 list_for_each_entry(use, &b->modules_which_use_me, list) {
416 if (use->module_which_uses == a) {
417 DEBUGP("%s uses %s!\n", a->name, b->name);
421 DEBUGP("%s does not use %s!\n", a->name, b->name);
425 /* Module a uses b */
426 static int use_module(struct module *a, struct module *b)
428 struct module_use *use;
429 if (b == NULL || already_uses(a, b)) return 1;
431 if (!strong_try_module_get(b))
434 DEBUGP("Allocating new usage for %s.\n", a->name);
435 use = kmalloc(sizeof(*use), GFP_ATOMIC);
437 printk("%s: out of memory loading\n", a->name);
442 use->module_which_uses = a;
443 list_add(&use->list, &b->modules_which_use_me);
447 /* Clear the unload stuff of the module. */
448 static void module_unload_free(struct module *mod)
452 list_for_each_entry(i, &modules, list) {
453 struct module_use *use;
455 list_for_each_entry(use, &i->modules_which_use_me, list) {
456 if (use->module_which_uses == mod) {
457 DEBUGP("%s unusing %s\n", mod->name, i->name);
459 list_del(&use->list);
461 /* There can be at most one match. */
468 #ifdef CONFIG_MODULE_FORCE_UNLOAD
469 static inline int try_force(unsigned int flags)
471 int ret = (flags & O_TRUNC);
473 tainted |= TAINT_FORCED_MODULE;
477 static inline int try_force(unsigned int flags)
481 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
490 /* Whole machine is stopped with interrupts off when this runs. */
491 static inline int __try_stop_module(void *_sref)
493 struct stopref *sref = _sref;
495 /* If it's not unused, quit unless we are told to block. */
496 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
497 if (!(*sref->forced = try_force(sref->flags)))
501 /* Mark it as dying. */
502 sref->mod->state = MODULE_STATE_GOING;
506 static int try_stop_module(struct module *mod, int flags, int *forced)
508 struct stopref sref = { mod, flags, forced };
510 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
513 unsigned int module_refcount(struct module *mod)
515 unsigned int i, total = 0;
517 for (i = 0; i < NR_CPUS; i++)
518 total += local_read(&mod->ref[i].count);
521 EXPORT_SYMBOL(module_refcount);
523 /* This exists whether we can unload or not */
524 static void free_module(struct module *mod);
526 static void wait_for_zero_refcount(struct module *mod)
528 /* Since we might sleep for some time, drop the semaphore first */
531 DEBUGP("Looking at refcount...\n");
532 set_current_state(TASK_UNINTERRUPTIBLE);
533 if (module_refcount(mod) == 0)
537 current->state = TASK_RUNNING;
542 sys_delete_module(const char __user *name_user, unsigned int flags)
545 char name[MODULE_NAME_LEN];
548 if (!capable(CAP_SYS_MODULE))
551 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
553 name[MODULE_NAME_LEN-1] = '\0';
555 if (down_interruptible(&module_mutex) != 0)
558 mod = find_module(name);
564 if (!list_empty(&mod->modules_which_use_me)) {
565 /* Other modules depend on us: get rid of them first. */
570 /* Doing init or already dying? */
571 if (mod->state != MODULE_STATE_LIVE) {
572 /* FIXME: if (force), slam module count and wake up
574 DEBUGP("%s already dying\n", mod->name);
579 /* If it has an init func, it must have an exit func to unload */
580 if ((mod->init != NULL && mod->exit == NULL)
582 forced = try_force(flags);
584 /* This module can't be removed */
590 /* Set this up before setting mod->state */
591 mod->waiter = current;
593 /* Stop the machine so refcounts can't move and disable module. */
594 ret = try_stop_module(mod, flags, &forced);
596 /* Never wait if forced. */
597 if (!forced && module_refcount(mod) != 0)
598 wait_for_zero_refcount(mod);
600 /* Final destruction now noone is using it. */
601 if (mod->exit != NULL) {
613 static void print_unload_info(struct seq_file *m, struct module *mod)
615 struct module_use *use;
616 int printed_something = 0;
618 seq_printf(m, " %u ", module_refcount(mod));
620 /* Always include a trailing , so userspace can differentiate
621 between this and the old multi-field proc format. */
622 list_for_each_entry(use, &mod->modules_which_use_me, list) {
623 printed_something = 1;
624 seq_printf(m, "%s,", use->module_which_uses->name);
628 printed_something = 1;
629 seq_printf(m, "[unsafe],");
632 if (mod->init != NULL && mod->exit == NULL) {
633 printed_something = 1;
634 seq_printf(m, "[permanent],");
637 if (!printed_something)
641 void __symbol_put(const char *symbol)
643 struct module *owner;
645 const unsigned long *crc;
647 spin_lock_irqsave(&modlist_lock, flags);
648 if (!__find_symbol(symbol, &owner, &crc, 1))
651 spin_unlock_irqrestore(&modlist_lock, flags);
653 EXPORT_SYMBOL(__symbol_put);
655 void symbol_put_addr(void *addr)
659 spin_lock_irqsave(&modlist_lock, flags);
660 if (!kernel_text_address((unsigned long)addr))
663 module_put(module_text_address((unsigned long)addr));
664 spin_unlock_irqrestore(&modlist_lock, flags);
666 EXPORT_SYMBOL_GPL(symbol_put_addr);
668 static int refcnt_get_fn(char *buffer, struct kernel_param *kp)
670 struct module *mod = container_of(kp, struct module, refcnt_param);
672 /* sysfs holds one reference. */
673 return sprintf(buffer, "%u", module_refcount(mod)-1);
676 static inline int sysfs_unload_setup(struct module *mod)
678 mod->refcnt_param.name = "refcnt";
679 mod->refcnt_param.perm = 0444;
680 mod->refcnt_param.get = refcnt_get_fn;
682 return add_attribute(mod, &mod->refcnt_param);
685 #else /* !CONFIG_MODULE_UNLOAD */
686 static void print_unload_info(struct seq_file *m, struct module *mod)
688 /* We don't know the usage count, or what modules are using. */
689 seq_printf(m, " - -");
692 static inline void module_unload_free(struct module *mod)
696 static inline int use_module(struct module *a, struct module *b)
698 return strong_try_module_get(b);
701 static inline void module_unload_init(struct module *mod)
706 sys_delete_module(const char __user *name_user, unsigned int flags)
711 static inline int sysfs_unload_setup(struct module *mod)
715 #endif /* CONFIG_MODULE_UNLOAD */
717 #ifdef CONFIG_OBSOLETE_MODPARM
718 /* Bounds checking done below */
719 static int obsparm_copy_string(const char *val, struct kernel_param *kp)
721 strcpy(kp->arg, val);
725 int set_obsolete(const char *val, struct kernel_param *kp)
727 unsigned int min, max;
728 unsigned int size, maxsize;
732 struct obsolete_modparm *obsparm = kp->arg;
735 printk(KERN_ERR "Parameter %s needs an argument\n", kp->name);
739 /* type is: [min[-max]]{b,h,i,l,s} */
741 min = simple_strtol(p, &endp, 10);
742 if (endp == obsparm->type)
744 else if (*endp == '-') {
746 max = simple_strtol(p, &endp, 10);
751 return param_array(kp->name, val, min, max, obsparm->addr,
752 1, param_set_byte, &dummy);
754 return param_array(kp->name, val, min, max, obsparm->addr,
755 sizeof(short), param_set_short, &dummy);
757 return param_array(kp->name, val, min, max, obsparm->addr,
758 sizeof(int), param_set_int, &dummy);
760 return param_array(kp->name, val, min, max, obsparm->addr,
761 sizeof(long), param_set_long, &dummy);
763 return param_array(kp->name, val, min, max, obsparm->addr,
764 sizeof(char *), param_set_charp, &dummy);
767 /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars,
768 and the decl is "char xxx[5][50];" */
770 maxsize = simple_strtol(p, &endp, 10);
771 /* We check lengths here (yes, this is a hack). */
773 while (p[size = strcspn(p, ",")]) {
780 return param_array(kp->name, val, min, max, obsparm->addr,
781 maxsize, obsparm_copy_string, &dummy);
783 printk(KERN_ERR "Unknown obsolete parameter type %s\n", obsparm->type);
787 "Parameter %s doesn't fit in %u chars.\n", kp->name, maxsize);
791 static int obsolete_params(const char *name,
793 struct obsolete_modparm obsparm[],
796 unsigned int symindex,
799 struct kernel_param *kp;
803 kp = kmalloc(sizeof(kp[0]) * num, GFP_KERNEL);
807 for (i = 0; i < num; i++) {
808 char sym_name[128 + sizeof(MODULE_SYMBOL_PREFIX)];
810 snprintf(sym_name, sizeof(sym_name), "%s%s",
811 MODULE_SYMBOL_PREFIX, obsparm[i].name);
813 kp[i].name = obsparm[i].name;
815 kp[i].set = set_obsolete;
818 = (void *)find_local_symbol(sechdrs, symindex, strtab,
820 if (!obsparm[i].addr) {
821 printk("%s: falsely claims to have parameter %s\n",
822 name, obsparm[i].name);
826 kp[i].arg = &obsparm[i];
829 ret = parse_args(name, args, kp, num, NULL);
835 static int obsolete_params(const char *name,
837 struct obsolete_modparm obsparm[],
840 unsigned int symindex,
844 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
848 #endif /* CONFIG_OBSOLETE_MODPARM */
850 static const char vermagic[] = VERMAGIC_STRING;
852 #ifdef CONFIG_MODVERSIONS
853 static int check_version(Elf_Shdr *sechdrs,
854 unsigned int versindex,
857 const unsigned long *crc)
859 unsigned int i, num_versions;
860 struct modversion_info *versions;
862 /* Exporting module didn't supply crcs? OK, we're already tainted. */
866 versions = (void *) sechdrs[versindex].sh_addr;
867 num_versions = sechdrs[versindex].sh_size
868 / sizeof(struct modversion_info);
870 for (i = 0; i < num_versions; i++) {
871 if (strcmp(versions[i].name, symname) != 0)
874 if (versions[i].crc == *crc)
876 printk("%s: disagrees about version of symbol %s\n",
878 DEBUGP("Found checksum %lX vs module %lX\n",
879 *crc, versions[i].crc);
882 /* Not in module's version table. OK, but that taints the kernel. */
883 if (!(tainted & TAINT_FORCED_MODULE)) {
884 printk("%s: no version for \"%s\" found: kernel tainted.\n",
886 tainted |= TAINT_FORCED_MODULE;
891 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
892 unsigned int versindex,
895 const unsigned long *crc;
896 struct module *owner;
898 if (!__find_symbol("struct_module", &owner, &crc, 1))
900 return check_version(sechdrs, versindex, "struct_module", mod,
904 /* First part is kernel version, which we ignore. */
905 static inline int same_magic(const char *amagic, const char *bmagic)
907 amagic += strcspn(amagic, " ");
908 bmagic += strcspn(bmagic, " ");
909 return strcmp(amagic, bmagic) == 0;
912 static inline int check_version(Elf_Shdr *sechdrs,
913 unsigned int versindex,
916 const unsigned long *crc)
921 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
922 unsigned int versindex,
928 static inline int same_magic(const char *amagic, const char *bmagic)
930 return strcmp(amagic, bmagic) == 0;
932 #endif /* CONFIG_MODVERSIONS */
934 /* Resolve a symbol for this module. I.e. if we find one, record usage.
935 Must be holding module_mutex. */
936 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
937 unsigned int versindex,
941 struct module *owner;
943 const unsigned long *crc;
945 spin_lock_irq(&modlist_lock);
946 ret = __find_symbol(name, &owner, &crc, mod->license_gplok);
948 /* use_module can fail due to OOM, or module unloading */
949 if (!check_version(sechdrs, versindex, name, mod, crc) ||
950 !use_module(mod, owner))
953 spin_unlock_irq(&modlist_lock);
959 * /sys/module/foo/sections stuff
960 * J. Corbet <corbet@lwn.net>
962 #ifdef CONFIG_KALLSYMS
963 static void module_sect_attrs_release(struct kobject *kobj)
965 kfree(container_of(kobj, struct module_sections, kobj));
968 static ssize_t module_sect_show(struct kobject *kobj, struct attribute *attr,
971 struct module_sect_attr *sattr =
972 container_of(attr, struct module_sect_attr, attr);
973 return sprintf(buf, "0x%lx\n", sattr->address);
976 static struct sysfs_ops module_sect_ops = {
977 .show = module_sect_show,
980 static struct kobj_type module_sect_ktype = {
981 .sysfs_ops = &module_sect_ops,
982 .release = module_sect_attrs_release,
985 static void add_sect_attrs(struct module *mod, unsigned int nsect,
986 char *secstrings, Elf_Shdr *sechdrs)
988 unsigned int nloaded = 0, i;
989 struct module_sect_attr *sattr;
994 /* Count loaded sections and allocate structures */
995 for (i = 0; i < nsect; i++)
996 if (sechdrs[i].sh_flags & SHF_ALLOC)
998 mod->sect_attrs = kmalloc(sizeof(struct module_sections) +
999 nloaded*sizeof(mod->sect_attrs->attrs[0]), GFP_KERNEL);
1000 if (! mod->sect_attrs)
1003 /* sections entry setup */
1004 memset(mod->sect_attrs, 0, sizeof(struct module_sections));
1005 if (kobject_set_name(&mod->sect_attrs->kobj, "sections"))
1007 mod->sect_attrs->kobj.parent = &mod->mkobj->kobj;
1008 mod->sect_attrs->kobj.ktype = &module_sect_ktype;
1009 if (kobject_register(&mod->sect_attrs->kobj))
1012 /* And the section attributes. */
1013 sattr = &mod->sect_attrs->attrs[0];
1014 for (i = 0; i < nsect; i++) {
1015 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1017 sattr->address = sechdrs[i].sh_addr;
1018 strlcpy(sattr->name, secstrings + sechdrs[i].sh_name,
1019 MODULE_SECT_NAME_LEN);
1020 sattr->attr.name = sattr->name;
1021 sattr->attr.owner = mod;
1022 sattr->attr.mode = S_IRUGO;
1023 (void) sysfs_create_file(&mod->sect_attrs->kobj, &sattr->attr);
1028 kfree(mod->sect_attrs);
1029 mod->sect_attrs = NULL;
1032 static void remove_sect_attrs(struct module *mod)
1034 if (mod->sect_attrs) {
1035 kobject_unregister(&mod->sect_attrs->kobj);
1036 mod->sect_attrs = NULL;
1042 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1043 char *sectstrings, Elf_Shdr *sechdrs)
1047 static inline void remove_sect_attrs(struct module *mod)
1050 #endif /* CONFIG_KALLSYMS */
1055 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
1057 static ssize_t module_attr_show(struct kobject *kobj,
1058 struct attribute *attr,
1062 struct module_attribute *attribute = to_module_attr(attr);
1064 if (!attribute->param->get)
1067 count = attribute->param->get(buf, attribute->param);
1075 /* sysfs always hands a nul-terminated string in buf. We rely on that. */
1076 static ssize_t module_attr_store(struct kobject *kobj,
1077 struct attribute *attr,
1078 const char *buf, size_t len)
1081 struct module_attribute *attribute = to_module_attr(attr);
1083 if (!attribute->param->set)
1086 err = attribute->param->set(buf, attribute->param);
1092 static struct sysfs_ops module_sysfs_ops = {
1093 .show = module_attr_show,
1094 .store = module_attr_store,
1097 static void module_kobj_release(struct kobject *kobj)
1099 kfree(container_of(kobj, struct module_kobject, kobj));
1102 static struct kobj_type module_ktype = {
1103 .sysfs_ops = &module_sysfs_ops,
1104 .release = &module_kobj_release,
1106 static decl_subsys(module, &module_ktype, NULL);
1108 static int mod_sysfs_setup(struct module *mod,
1109 struct kernel_param *kparam,
1110 unsigned int num_params)
1115 /* We overallocate: not every param is in sysfs, and maybe no refcnt */
1116 mod->mkobj = kmalloc(sizeof(*mod->mkobj)
1117 + sizeof(mod->mkobj->attr[0]) * (num_params+1),
1122 memset(&mod->mkobj->kobj, 0, sizeof(mod->mkobj->kobj));
1123 err = kobject_set_name(&mod->mkobj->kobj, mod->name);
1126 kobj_set_kset_s(mod->mkobj, module_subsys);
1127 err = kobject_register(&mod->mkobj->kobj);
1131 mod->mkobj->num_attributes = 0;
1133 for (i = 0; i < num_params; i++) {
1134 if (kparam[i].perm) {
1135 err = add_attribute(mod, &kparam[i]);
1140 err = sysfs_unload_setup(mod);
1146 for (i = 0; i < mod->mkobj->num_attributes; i++)
1147 sysfs_remove_file(&mod->mkobj->kobj,&mod->mkobj->attr[i].attr);
1148 /* Calls module_kobj_release */
1149 kobject_unregister(&mod->mkobj->kobj);
1156 static void mod_kobject_remove(struct module *mod)
1159 for (i = 0; i < mod->mkobj->num_attributes; i++)
1160 sysfs_remove_file(&mod->mkobj->kobj,&mod->mkobj->attr[i].attr);
1161 /* Calls module_kobj_release */
1162 kobject_unregister(&mod->mkobj->kobj);
1165 /* Free a module, remove from lists, etc (must hold module mutex). */
1166 static void free_module(struct module *mod)
1168 /* Delete from various lists */
1169 spin_lock_irq(&modlist_lock);
1170 list_del(&mod->list);
1171 spin_unlock_irq(&modlist_lock);
1173 remove_sect_attrs(mod);
1174 mod_kobject_remove(mod);
1176 /* Arch-specific cleanup. */
1177 module_arch_cleanup(mod);
1179 /* Module unload stuff */
1180 module_unload_free(mod);
1182 /* This may be NULL, but that's OK */
1183 module_free(mod, mod->module_init);
1186 percpu_modfree(mod->percpu);
1188 /* Finally, free the core (containing the module structure) */
1189 module_free(mod, mod->module_core);
1192 void *__symbol_get(const char *symbol)
1194 struct module *owner;
1195 unsigned long value, flags;
1196 const unsigned long *crc;
1198 spin_lock_irqsave(&modlist_lock, flags);
1199 value = __find_symbol(symbol, &owner, &crc, 1);
1200 if (value && !strong_try_module_get(owner))
1202 spin_unlock_irqrestore(&modlist_lock, flags);
1204 return (void *)value;
1206 EXPORT_SYMBOL_GPL(__symbol_get);
1208 /* Change all symbols so that sh_value encodes the pointer directly. */
1209 static int simplify_symbols(Elf_Shdr *sechdrs,
1210 unsigned int symindex,
1212 unsigned int versindex,
1213 unsigned int pcpuindex,
1216 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1217 unsigned long secbase;
1218 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1221 for (i = 1; i < n; i++) {
1222 switch (sym[i].st_shndx) {
1224 /* We compiled with -fno-common. These are not
1225 supposed to happen. */
1226 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1227 printk("%s: please compile with -fno-common\n",
1233 /* Don't need to do anything */
1234 DEBUGP("Absolute symbol: 0x%08lx\n",
1235 (long)sym[i].st_value);
1240 = resolve_symbol(sechdrs, versindex,
1241 strtab + sym[i].st_name, mod);
1243 /* Ok if resolved. */
1244 if (sym[i].st_value != 0)
1247 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1250 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1251 mod->name, strtab + sym[i].st_name);
1256 /* Divert to percpu allocation if a percpu var. */
1257 if (sym[i].st_shndx == pcpuindex)
1258 secbase = (unsigned long)mod->percpu;
1260 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1261 sym[i].st_value += secbase;
1269 /* Update size with this section: return offset. */
1270 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1274 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1275 *size = ret + sechdr->sh_size;
1279 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1280 might -- code, read-only data, read-write data, small data. Tally
1281 sizes, and place the offsets into sh_entsize fields: high bit means it
1283 static void layout_sections(struct module *mod,
1284 const Elf_Ehdr *hdr,
1286 const char *secstrings)
1288 static unsigned long const masks[][2] = {
1289 /* NOTE: all executable code must be the first section
1290 * in this array; otherwise modify the text_size
1291 * finder in the two loops below */
1292 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1293 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1294 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1295 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1299 for (i = 0; i < hdr->e_shnum; i++)
1300 sechdrs[i].sh_entsize = ~0UL;
1302 DEBUGP("Core section allocation order:\n");
1303 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1304 for (i = 0; i < hdr->e_shnum; ++i) {
1305 Elf_Shdr *s = &sechdrs[i];
1307 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1308 || (s->sh_flags & masks[m][1])
1309 || s->sh_entsize != ~0UL
1310 || strncmp(secstrings + s->sh_name,
1313 s->sh_entsize = get_offset(&mod->core_size, s);
1314 DEBUGP("\t%s\n", secstrings + s->sh_name);
1317 mod->core_text_size = mod->core_size;
1320 DEBUGP("Init section allocation order:\n");
1321 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1322 for (i = 0; i < hdr->e_shnum; ++i) {
1323 Elf_Shdr *s = &sechdrs[i];
1325 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1326 || (s->sh_flags & masks[m][1])
1327 || s->sh_entsize != ~0UL
1328 || strncmp(secstrings + s->sh_name,
1331 s->sh_entsize = (get_offset(&mod->init_size, s)
1332 | INIT_OFFSET_MASK);
1333 DEBUGP("\t%s\n", secstrings + s->sh_name);
1336 mod->init_text_size = mod->init_size;
1340 static inline int license_is_gpl_compatible(const char *license)
1342 return (strcmp(license, "GPL") == 0
1343 || strcmp(license, "GPL v2") == 0
1344 || strcmp(license, "GPL and additional rights") == 0
1345 || strcmp(license, "Dual BSD/GPL") == 0
1346 || strcmp(license, "Dual MPL/GPL") == 0);
1349 static void set_license(struct module *mod, const char *license)
1352 license = "unspecified";
1354 mod->license_gplok = license_is_gpl_compatible(license);
1355 if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) {
1356 printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
1357 mod->name, license);
1358 tainted |= TAINT_PROPRIETARY_MODULE;
1362 /* Parse tag=value strings from .modinfo section */
1363 static char *next_string(char *string, unsigned long *secsize)
1365 /* Skip non-zero chars */
1368 if ((*secsize)-- <= 1)
1372 /* Skip any zero padding. */
1373 while (!string[0]) {
1375 if ((*secsize)-- <= 1)
1381 static char *get_modinfo(Elf_Shdr *sechdrs,
1386 unsigned int taglen = strlen(tag);
1387 unsigned long size = sechdrs[info].sh_size;
1389 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1390 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1391 return p + taglen + 1;
1396 #ifdef CONFIG_KALLSYMS
1397 int is_exported(const char *name, const struct module *mod)
1402 for (i = 0; __start___ksymtab+i < __stop___ksymtab; i++)
1403 if (strcmp(__start___ksymtab[i].name, name) == 0)
1407 for (i = 0; i < mod->num_syms; i++)
1408 if (strcmp(mod->syms[i].name, name) == 0)
1414 static char elf_type(const Elf_Sym *sym,
1416 const char *secstrings,
1419 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1420 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1425 if (sym->st_shndx == SHN_UNDEF)
1427 if (sym->st_shndx == SHN_ABS)
1429 if (sym->st_shndx >= SHN_LORESERVE)
1431 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1433 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1434 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1435 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1437 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1442 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1443 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1448 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1449 ".debug", strlen(".debug")) == 0)
1454 static void add_kallsyms(struct module *mod,
1456 unsigned int symindex,
1457 unsigned int strindex,
1458 const char *secstrings)
1462 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1463 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1464 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1466 /* Set types up while we still have access to sections. */
1467 for (i = 0; i < mod->num_symtab; i++)
1468 mod->symtab[i].st_info
1469 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1472 static inline void add_kallsyms(struct module *mod,
1474 unsigned int symindex,
1475 unsigned int strindex,
1476 const char *secstrings)
1479 #endif /* CONFIG_KALLSYMS */
1481 /* Allocate and load the module: note that size of section 0 is always
1482 zero, and we rely on this for optional sections. */
1483 static struct module *load_module(void __user *umod,
1485 const char __user *uargs)
1489 char *secstrings, *args, *modmagic, *strtab = NULL;
1490 unsigned int i, symindex = 0, strindex = 0, setupindex, exindex,
1491 exportindex, modindex, obsparmindex, infoindex, gplindex,
1492 crcindex, gplcrcindex, versindex, pcpuindex;
1496 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1497 struct exception_table_entry *extable;
1500 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1502 if (len < sizeof(*hdr))
1503 return ERR_PTR(-ENOEXEC);
1505 /* Suck in entire file: we'll want most of it. */
1506 /* vmalloc barfs on "unusual" numbers. Check here */
1507 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1508 return ERR_PTR(-ENOMEM);
1509 if (copy_from_user(hdr, umod, len) != 0) {
1514 /* Sanity checks against insmoding binaries or wrong arch,
1515 weird elf version */
1516 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1517 || hdr->e_type != ET_REL
1518 || !elf_check_arch(hdr)
1519 || hdr->e_shentsize != sizeof(*sechdrs)) {
1524 /* verify the module (validates ELF and checks signature) */
1526 err = module_verify(hdr, len);
1532 /* Convenience variables */
1533 sechdrs = (void *)hdr + hdr->e_shoff;
1534 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1535 sechdrs[0].sh_addr = 0;
1537 for (i = 1; i < hdr->e_shnum; i++) {
1538 if (sechdrs[i].sh_type != SHT_NOBITS
1539 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1542 /* Mark all sections sh_addr with their address in the
1544 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1546 /* Internal symbols and strings. */
1547 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1549 strindex = sechdrs[i].sh_link;
1550 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1552 #ifndef CONFIG_MODULE_UNLOAD
1553 /* Don't load .exit sections */
1554 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1555 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1559 modindex = find_sec(hdr, sechdrs, secstrings,
1560 ".gnu.linkonce.this_module");
1562 printk(KERN_WARNING "No module found in object\n");
1566 mod = (void *)sechdrs[modindex].sh_addr;
1567 mod->gpgsig_ok = gpgsig_ok;
1569 if (symindex == 0) {
1570 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1576 /* Optional sections */
1577 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1578 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1579 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1580 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1581 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1582 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1583 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1584 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1585 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1586 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1588 /* Don't keep modinfo section */
1589 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1590 #ifdef CONFIG_KALLSYMS
1591 /* Keep symbol and string tables for decoding later. */
1592 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1593 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1596 /* Check module struct version now, before we try to use module. */
1597 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1602 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1603 /* This is allowed: modprobe --force will invalidate it. */
1605 tainted |= TAINT_FORCED_MODULE;
1606 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1608 } else if (!same_magic(modmagic, vermagic)) {
1609 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1610 mod->name, modmagic, vermagic);
1615 /* Now copy in args */
1616 arglen = strlen_user(uargs);
1621 args = kmalloc(arglen, GFP_KERNEL);
1626 if (copy_from_user(args, uargs, arglen) != 0) {
1631 if (find_module(mod->name)) {
1636 mod->state = MODULE_STATE_COMING;
1638 /* Allow arches to frob section contents and sizes. */
1639 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1644 /* We have a special allocation for this section. */
1645 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1646 sechdrs[pcpuindex].sh_addralign);
1651 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1652 mod->percpu = percpu;
1655 /* Determine total sizes, and put offsets in sh_entsize. For now
1656 this is done generically; there doesn't appear to be any
1657 special cases for the architectures. */
1658 layout_sections(mod, hdr, sechdrs, secstrings);
1660 /* Do the allocs. */
1661 ptr = module_alloc(mod->core_size);
1666 memset(ptr, 0, mod->core_size);
1667 mod->module_core = ptr;
1669 ptr = module_alloc(mod->init_size);
1670 if (!ptr && mod->init_size) {
1674 memset(ptr, 0, mod->init_size);
1675 mod->module_init = ptr;
1677 /* Transfer each section which specifies SHF_ALLOC */
1678 DEBUGP("final section addresses:\n");
1679 for (i = 0; i < hdr->e_shnum; i++) {
1682 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1685 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1686 dest = mod->module_init
1687 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1689 dest = mod->module_core + sechdrs[i].sh_entsize;
1691 if (sechdrs[i].sh_type != SHT_NOBITS)
1692 memcpy(dest, (void *)sechdrs[i].sh_addr,
1693 sechdrs[i].sh_size);
1694 /* Update sh_addr to point to copy in image. */
1695 sechdrs[i].sh_addr = (unsigned long)dest;
1696 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1698 /* Module has been moved. */
1699 mod = (void *)sechdrs[modindex].sh_addr;
1701 /* Now we've moved module, initialize linked lists, etc. */
1702 module_unload_init(mod);
1704 /* Set up license info based on the info section */
1705 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1707 /* Fix up syms, so that st_value is a pointer to location. */
1708 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1713 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1714 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1715 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1717 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1718 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1719 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1721 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1723 #ifdef CONFIG_MODVERSIONS
1724 if ((mod->num_syms && !crcindex) ||
1725 (mod->num_gpl_syms && !gplcrcindex)) {
1726 printk(KERN_WARNING "%s: No versions for exported symbols."
1727 " Tainting kernel.\n", mod->name);
1728 tainted |= TAINT_FORCED_MODULE;
1732 /* Now do relocations. */
1733 for (i = 1; i < hdr->e_shnum; i++) {
1734 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1735 unsigned int info = sechdrs[i].sh_info;
1737 /* Not a valid relocation section? */
1738 if (info >= hdr->e_shnum)
1741 /* Don't bother with non-allocated sections */
1742 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1745 if (sechdrs[i].sh_type == SHT_REL)
1746 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1747 else if (sechdrs[i].sh_type == SHT_RELA)
1748 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1754 /* Set up and sort exception table */
1755 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1756 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1757 sort_extable(extable, extable + mod->num_exentries);
1759 /* Finally, copy percpu area over. */
1760 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
1761 sechdrs[pcpuindex].sh_size);
1763 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
1765 err = module_finalize(hdr, sechdrs, mod);
1771 err = obsolete_params(mod->name, mod->args,
1772 (struct obsolete_modparm *)
1773 sechdrs[obsparmindex].sh_addr,
1774 sechdrs[obsparmindex].sh_size
1775 / sizeof(struct obsolete_modparm),
1777 (char *)sechdrs[strindex].sh_addr);
1779 printk(KERN_WARNING "%s: Ignoring new-style "
1780 "parameters in presence of obsolete ones\n",
1783 /* Size of section 0 is 0, so this works well if no params */
1784 err = parse_args(mod->name, mod->args,
1785 (struct kernel_param *)
1786 sechdrs[setupindex].sh_addr,
1787 sechdrs[setupindex].sh_size
1788 / sizeof(struct kernel_param),
1791 err = mod_sysfs_setup(mod,
1792 (struct kernel_param *)
1793 sechdrs[setupindex].sh_addr,
1794 sechdrs[setupindex].sh_size
1795 / sizeof(struct kernel_param));
1798 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
1800 /* Get rid of temporary copy */
1807 module_arch_cleanup(mod);
1809 module_unload_free(mod);
1810 module_free(mod, mod->module_init);
1812 module_free(mod, mod->module_core);
1815 percpu_modfree(percpu);
1820 if (err < 0) return ERR_PTR(err);
1824 printk(KERN_ERR "Module len %lu truncated\n", len);
1829 /* This is where the real work happens */
1831 sys_init_module(void __user *umod,
1833 const char __user *uargs)
1838 /* Must have permission */
1839 if (!capable(CAP_SYS_MODULE))
1842 /* Only one module load at a time, please */
1843 if (down_interruptible(&module_mutex) != 0)
1846 /* Do all the hard work */
1847 mod = load_module(umod, len, uargs);
1850 return PTR_ERR(mod);
1853 /* Flush the instruction cache, since we've played with text */
1854 if (mod->module_init)
1855 flush_icache_range((unsigned long)mod->module_init,
1856 (unsigned long)mod->module_init
1858 flush_icache_range((unsigned long)mod->module_core,
1859 (unsigned long)mod->module_core + mod->core_size);
1861 /* Now sew it into the lists. They won't access us, since
1862 strong_try_module_get() will fail. */
1863 spin_lock_irq(&modlist_lock);
1864 list_add(&mod->list, &modules);
1865 spin_unlock_irq(&modlist_lock);
1867 /* Drop lock so they can recurse */
1870 down(¬ify_mutex);
1871 notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod);
1874 /* Start the module */
1875 if (mod->init != NULL)
1878 /* Init routine failed: abort. Try to protect us from
1879 buggy refcounters. */
1880 mod->state = MODULE_STATE_GOING;
1881 synchronize_kernel();
1883 printk(KERN_ERR "%s: module is now stuck!\n",
1887 down(&module_mutex);
1894 /* Now it's a first class citizen! */
1895 down(&module_mutex);
1896 mod->state = MODULE_STATE_LIVE;
1897 /* Drop initial reference. */
1899 module_free(mod, mod->module_init);
1900 mod->module_init = NULL;
1902 mod->init_text_size = 0;
1908 static inline int within(unsigned long addr, void *start, unsigned long size)
1910 return ((void *)addr >= start && (void *)addr < start + size);
1913 #ifdef CONFIG_KALLSYMS
1914 static const char *get_ksymbol(struct module *mod,
1916 unsigned long *size,
1917 unsigned long *offset)
1919 unsigned int i, best = 0;
1920 unsigned long nextval;
1922 /* At worse, next value is at end of module */
1923 if (within(addr, mod->module_init, mod->init_size))
1924 nextval = (unsigned long)mod->module_init+mod->init_text_size;
1926 nextval = (unsigned long)mod->module_core+mod->core_text_size;
1928 /* Scan for closest preceeding symbol, and next symbol. (ELF
1929 starts real symbols at 1). */
1930 for (i = 1; i < mod->num_symtab; i++) {
1931 if (mod->symtab[i].st_shndx == SHN_UNDEF)
1934 /* We ignore unnamed symbols: they're uninformative
1935 * and inserted at a whim. */
1936 if (mod->symtab[i].st_value <= addr
1937 && mod->symtab[i].st_value > mod->symtab[best].st_value
1938 && *(mod->strtab + mod->symtab[i].st_name) != '\0' )
1940 if (mod->symtab[i].st_value > addr
1941 && mod->symtab[i].st_value < nextval
1942 && *(mod->strtab + mod->symtab[i].st_name) != '\0')
1943 nextval = mod->symtab[i].st_value;
1949 *size = nextval - mod->symtab[best].st_value;
1950 *offset = addr - mod->symtab[best].st_value;
1951 return mod->strtab + mod->symtab[best].st_name;
1954 /* For kallsyms to ask for address resolution. NULL means not found.
1955 We don't lock, as this is used for oops resolution and races are a
1957 const char *module_address_lookup(unsigned long addr,
1958 unsigned long *size,
1959 unsigned long *offset,
1964 list_for_each_entry(mod, &modules, list) {
1965 if (within(addr, mod->module_init, mod->init_size)
1966 || within(addr, mod->module_core, mod->core_size)) {
1967 *modname = mod->name;
1968 return get_ksymbol(mod, addr, size, offset);
1974 struct module *module_get_kallsym(unsigned int symnum,
1975 unsigned long *value,
1981 down(&module_mutex);
1982 list_for_each_entry(mod, &modules, list) {
1983 if (symnum < mod->num_symtab) {
1984 *value = mod->symtab[symnum].st_value;
1985 *type = mod->symtab[symnum].st_info;
1987 mod->strtab + mod->symtab[symnum].st_name,
1992 symnum -= mod->num_symtab;
1998 static unsigned long mod_find_symname(struct module *mod, const char *name)
2002 for (i = 0; i < mod->num_symtab; i++)
2003 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0)
2004 return mod->symtab[i].st_value;
2008 /* Look for this name: can be of form module:name. */
2009 unsigned long module_kallsyms_lookup_name(const char *name)
2013 unsigned long ret = 0;
2015 /* Don't lock: we're in enough trouble already. */
2016 if ((colon = strchr(name, ':')) != NULL) {
2018 if ((mod = find_module(name)) != NULL)
2019 ret = mod_find_symname(mod, colon+1);
2022 list_for_each_entry(mod, &modules, list)
2023 if ((ret = mod_find_symname(mod, name)) != 0)
2028 #endif /* CONFIG_KALLSYMS */
2030 /* Called by the /proc file system to return a list of modules. */
2031 static void *m_start(struct seq_file *m, loff_t *pos)
2033 struct list_head *i;
2036 down(&module_mutex);
2037 list_for_each(i, &modules) {
2046 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2048 struct list_head *i = p;
2050 if (i->next == &modules)
2055 static void m_stop(struct seq_file *m, void *p)
2060 static int m_show(struct seq_file *m, void *p)
2062 struct module *mod = list_entry(p, struct module, list);
2063 seq_printf(m, "%s %lu",
2064 mod->name, mod->init_size + mod->core_size);
2065 print_unload_info(m, mod);
2067 /* Informative for users. */
2068 seq_printf(m, " %s",
2069 mod->state == MODULE_STATE_GOING ? "Unloading":
2070 mod->state == MODULE_STATE_COMING ? "Loading":
2072 /* Used by oprofile and other similar tools. */
2073 seq_printf(m, " 0x%p", mod->module_core);
2075 seq_printf(m, "\n");
2079 /* Format: modulename size refcount deps address
2081 Where refcount is a number or -, and deps is a comma-separated list
2084 struct seq_operations modules_op = {
2091 /* Given an address, look for it in the module exception tables. */
2092 const struct exception_table_entry *search_module_extables(unsigned long addr)
2094 unsigned long flags;
2095 const struct exception_table_entry *e = NULL;
2098 spin_lock_irqsave(&modlist_lock, flags);
2099 list_for_each_entry(mod, &modules, list) {
2100 if (mod->num_exentries == 0)
2103 e = search_extable(mod->extable,
2104 mod->extable + mod->num_exentries - 1,
2109 spin_unlock_irqrestore(&modlist_lock, flags);
2111 /* Now, if we found one, we are running inside it now, hence
2112 we cannot unload the module, hence no refcnt needed. */
2116 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2117 struct module *__module_text_address(unsigned long addr)
2121 list_for_each_entry(mod, &modules, list)
2122 if (within(addr, mod->module_init, mod->init_text_size)
2123 || within(addr, mod->module_core, mod->core_text_size))
2128 struct module *module_text_address(unsigned long addr)
2131 unsigned long flags;
2133 spin_lock_irqsave(&modlist_lock, flags);
2134 mod = __module_text_address(addr);
2135 spin_unlock_irqrestore(&modlist_lock, flags);
2140 /* Don't grab lock, we're oopsing. */
2141 void print_modules(void)
2145 printk("Modules linked in:");
2146 list_for_each_entry(mod, &modules, list) {
2147 printk(" %s", mod->name);
2148 #if CONFIG_MODULE_SIG
2149 if (!mod->gpgsig_ok)
2156 #ifdef CONFIG_MODVERSIONS
2157 /* Generate the signature for struct module here, too, for modversions. */
2158 void struct_module(struct module *mod) { return; }
2159 EXPORT_SYMBOL(struct_module);
2162 static int __init modules_init(void)
2164 return subsystem_register(&module_subsys);
2166 __initcall(modules_init);