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/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
26 #include <linux/elf.h>
27 #include <linux/seq_file.h>
28 #include <linux/syscalls.h>
29 #include <linux/fcntl.h>
30 #include <linux/rcupdate.h>
31 #include <linux/capability.h>
32 #include <linux/cpu.h>
33 #include <linux/moduleparam.h>
34 #include <linux/errno.h>
35 #include <linux/err.h>
36 #include <linux/vermagic.h>
37 #include <linux/notifier.h>
38 #include <linux/stop_machine.h>
39 #include <linux/device.h>
40 #include <linux/string.h>
41 #include <linux/sched.h>
42 #include <linux/mutex.h>
43 #include <linux/unwind.h>
44 #include <asm/uaccess.h>
45 #include <asm/semaphore.h>
46 #include <asm/cacheflush.h>
51 #define DEBUGP(fmt , a...)
54 #ifndef ARCH_SHF_SMALL
55 #define ARCH_SHF_SMALL 0
58 /* If this is set, the section belongs in the init part of the module */
59 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
61 /* Protects module list */
62 static DEFINE_SPINLOCK(modlist_lock);
64 /* List of modules, protected by module_mutex AND modlist_lock */
65 static DEFINE_MUTEX(module_mutex);
66 static LIST_HEAD(modules);
68 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
70 int register_module_notifier(struct notifier_block * nb)
72 return blocking_notifier_chain_register(&module_notify_list, nb);
74 EXPORT_SYMBOL(register_module_notifier);
76 int unregister_module_notifier(struct notifier_block * nb)
78 return blocking_notifier_chain_unregister(&module_notify_list, nb);
80 EXPORT_SYMBOL(unregister_module_notifier);
82 /* We require a truly strong try_module_get() */
83 static inline int strong_try_module_get(struct module *mod)
85 if (mod && mod->state == MODULE_STATE_COMING)
87 return try_module_get(mod);
90 /* A thread that wants to hold a reference to a module only while it
91 * is running can call ths to safely exit.
92 * nfsd and lockd use this.
94 void __module_put_and_exit(struct module *mod, long code)
99 EXPORT_SYMBOL(__module_put_and_exit);
101 /* Find a module section: 0 means not found. */
102 static unsigned int find_sec(Elf_Ehdr *hdr,
104 const char *secstrings,
109 for (i = 1; i < hdr->e_shnum; i++)
110 /* Alloc bit cleared means "ignore it." */
111 if ((sechdrs[i].sh_flags & SHF_ALLOC)
112 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
117 /* Provided by the linker */
118 extern const struct kernel_symbol __start___ksymtab[];
119 extern const struct kernel_symbol __stop___ksymtab[];
120 extern const struct kernel_symbol __start___ksymtab_gpl[];
121 extern const struct kernel_symbol __stop___ksymtab_gpl[];
122 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
123 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
124 extern const unsigned long __start___kcrctab[];
125 extern const unsigned long __start___kcrctab_gpl[];
126 extern const unsigned long __start___kcrctab_gpl_future[];
128 #ifndef CONFIG_MODVERSIONS
129 #define symversion(base, idx) NULL
131 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
134 /* lookup symbol in given range of kernel_symbols */
135 static const struct kernel_symbol *lookup_symbol(const char *name,
136 const struct kernel_symbol *start,
137 const struct kernel_symbol *stop)
139 const struct kernel_symbol *ks = start;
140 for (; ks < stop; ks++)
141 if (strcmp(ks->name, name) == 0)
146 /* Find a symbol, return value, crc and module which owns it */
147 static unsigned long __find_symbol(const char *name,
148 struct module **owner,
149 const unsigned long **crc,
153 const struct kernel_symbol *ks;
155 /* Core kernel first. */
157 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
159 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
163 ks = lookup_symbol(name, __start___ksymtab_gpl,
164 __stop___ksymtab_gpl);
166 *crc = symversion(__start___kcrctab_gpl,
167 (ks - __start___ksymtab_gpl));
171 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
172 __stop___ksymtab_gpl_future);
175 printk(KERN_WARNING "Symbol %s is being used "
176 "by a non-GPL module, which will not "
177 "be allowed in the future\n", name);
178 printk(KERN_WARNING "Please see the file "
179 "Documentation/feature-removal-schedule.txt "
180 "in the kernel source tree for more "
183 *crc = symversion(__start___kcrctab_gpl_future,
184 (ks - __start___ksymtab_gpl_future));
188 /* Now try modules. */
189 list_for_each_entry(mod, &modules, list) {
191 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
193 *crc = symversion(mod->crcs, (ks - mod->syms));
198 ks = lookup_symbol(name, mod->gpl_syms,
199 mod->gpl_syms + mod->num_gpl_syms);
201 *crc = symversion(mod->gpl_crcs,
202 (ks - mod->gpl_syms));
206 ks = lookup_symbol(name, mod->gpl_future_syms,
207 (mod->gpl_future_syms +
208 mod->num_gpl_future_syms));
211 printk(KERN_WARNING "Symbol %s is being used "
212 "by a non-GPL module, which will not "
213 "be allowed in the future\n", name);
214 printk(KERN_WARNING "Please see the file "
215 "Documentation/feature-removal-schedule.txt "
216 "in the kernel source tree for more "
219 *crc = symversion(mod->gpl_future_crcs,
220 (ks - mod->gpl_future_syms));
224 DEBUGP("Failed to find symbol %s\n", name);
228 /* Search for module by name: must hold module_mutex. */
229 static struct module *find_module(const char *name)
233 list_for_each_entry(mod, &modules, list) {
234 if (strcmp(mod->name, name) == 0)
241 /* Number of blocks used and allocated. */
242 static unsigned int pcpu_num_used, pcpu_num_allocated;
243 /* Size of each block. -ve means used. */
244 static int *pcpu_size;
246 static int split_block(unsigned int i, unsigned short size)
248 /* Reallocation required? */
249 if (pcpu_num_used + 1 > pcpu_num_allocated) {
250 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2,
255 memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated);
256 pcpu_num_allocated *= 2;
261 /* Insert a new subblock */
262 memmove(&pcpu_size[i+1], &pcpu_size[i],
263 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
266 pcpu_size[i+1] -= size;
271 static inline unsigned int block_size(int val)
278 /* Created by linker magic */
279 extern char __per_cpu_start[], __per_cpu_end[];
281 static void *percpu_modalloc(unsigned long size, unsigned long align,
288 if (align > SMP_CACHE_BYTES) {
289 printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n",
290 name, align, SMP_CACHE_BYTES);
291 align = SMP_CACHE_BYTES;
294 ptr = __per_cpu_start;
295 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
296 /* Extra for alignment requirement. */
297 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
298 BUG_ON(i == 0 && extra != 0);
300 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
303 /* Transfer extra to previous block. */
304 if (pcpu_size[i-1] < 0)
305 pcpu_size[i-1] -= extra;
307 pcpu_size[i-1] += extra;
308 pcpu_size[i] -= extra;
311 /* Split block if warranted */
312 if (pcpu_size[i] - size > sizeof(unsigned long))
313 if (!split_block(i, size))
317 pcpu_size[i] = -pcpu_size[i];
321 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
326 static void percpu_modfree(void *freeme)
329 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
331 /* First entry is core kernel percpu data. */
332 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
334 pcpu_size[i] = -pcpu_size[i];
341 /* Merge with previous? */
342 if (pcpu_size[i-1] >= 0) {
343 pcpu_size[i-1] += pcpu_size[i];
345 memmove(&pcpu_size[i], &pcpu_size[i+1],
346 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
349 /* Merge with next? */
350 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
351 pcpu_size[i] += pcpu_size[i+1];
353 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
354 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
358 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
360 const char *secstrings)
362 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
365 static int percpu_modinit(void)
368 pcpu_num_allocated = 2;
369 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
371 /* Static in-kernel percpu data (used). */
372 pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
374 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
375 if (pcpu_size[1] < 0) {
376 printk(KERN_ERR "No per-cpu room for modules.\n");
382 __initcall(percpu_modinit);
383 #else /* ... !CONFIG_SMP */
384 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
389 static inline void percpu_modfree(void *pcpuptr)
393 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
395 const char *secstrings)
399 static inline void percpu_modcopy(void *pcpudst, const void *src,
402 /* pcpusec should be 0, and size of that section should be 0. */
405 #endif /* CONFIG_SMP */
407 #define MODINFO_ATTR(field) \
408 static void setup_modinfo_##field(struct module *mod, const char *s) \
410 mod->field = kstrdup(s, GFP_KERNEL); \
412 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
413 struct module *mod, char *buffer) \
415 return sprintf(buffer, "%s\n", mod->field); \
417 static int modinfo_##field##_exists(struct module *mod) \
419 return mod->field != NULL; \
421 static void free_modinfo_##field(struct module *mod) \
426 static struct module_attribute modinfo_##field = { \
427 .attr = { .name = __stringify(field), .mode = 0444, \
428 .owner = THIS_MODULE }, \
429 .show = show_modinfo_##field, \
430 .setup = setup_modinfo_##field, \
431 .test = modinfo_##field##_exists, \
432 .free = free_modinfo_##field, \
435 MODINFO_ATTR(version);
436 MODINFO_ATTR(srcversion);
438 #ifdef CONFIG_MODULE_UNLOAD
439 /* Init the unload section of the module. */
440 static void module_unload_init(struct module *mod)
444 INIT_LIST_HEAD(&mod->modules_which_use_me);
445 for (i = 0; i < NR_CPUS; i++)
446 local_set(&mod->ref[i].count, 0);
447 /* Hold reference count during initialization. */
448 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
449 /* Backwards compatibility macros put refcount during init. */
450 mod->waiter = current;
453 /* modules using other modules */
456 struct list_head list;
457 struct module *module_which_uses;
460 /* Does a already use b? */
461 static int already_uses(struct module *a, struct module *b)
463 struct module_use *use;
465 list_for_each_entry(use, &b->modules_which_use_me, list) {
466 if (use->module_which_uses == a) {
467 DEBUGP("%s uses %s!\n", a->name, b->name);
471 DEBUGP("%s does not use %s!\n", a->name, b->name);
475 /* Module a uses b */
476 static int use_module(struct module *a, struct module *b)
478 struct module_use *use;
479 if (b == NULL || already_uses(a, b)) return 1;
481 if (!strong_try_module_get(b))
484 DEBUGP("Allocating new usage for %s.\n", a->name);
485 use = kmalloc(sizeof(*use), GFP_ATOMIC);
487 printk("%s: out of memory loading\n", a->name);
492 use->module_which_uses = a;
493 list_add(&use->list, &b->modules_which_use_me);
497 /* Clear the unload stuff of the module. */
498 static void module_unload_free(struct module *mod)
502 list_for_each_entry(i, &modules, list) {
503 struct module_use *use;
505 list_for_each_entry(use, &i->modules_which_use_me, list) {
506 if (use->module_which_uses == mod) {
507 DEBUGP("%s unusing %s\n", mod->name, i->name);
509 list_del(&use->list);
511 /* There can be at most one match. */
518 #ifdef CONFIG_MODULE_FORCE_UNLOAD
519 static inline int try_force_unload(unsigned int flags)
521 int ret = (flags & O_TRUNC);
523 add_taint(TAINT_FORCED_RMMOD);
527 static inline int try_force_unload(unsigned int flags)
531 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
540 /* Whole machine is stopped with interrupts off when this runs. */
541 static int __try_stop_module(void *_sref)
543 struct stopref *sref = _sref;
545 /* If it's not unused, quit unless we are told to block. */
546 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
547 if (!(*sref->forced = try_force_unload(sref->flags)))
551 /* Mark it as dying. */
552 sref->mod->state = MODULE_STATE_GOING;
556 static int try_stop_module(struct module *mod, int flags, int *forced)
558 struct stopref sref = { mod, flags, forced };
560 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
563 unsigned int module_refcount(struct module *mod)
565 unsigned int i, total = 0;
567 for (i = 0; i < NR_CPUS; i++)
568 total += local_read(&mod->ref[i].count);
571 EXPORT_SYMBOL(module_refcount);
573 /* This exists whether we can unload or not */
574 static void free_module(struct module *mod);
576 static void wait_for_zero_refcount(struct module *mod)
578 /* Since we might sleep for some time, drop the semaphore first */
579 mutex_unlock(&module_mutex);
581 DEBUGP("Looking at refcount...\n");
582 set_current_state(TASK_UNINTERRUPTIBLE);
583 if (module_refcount(mod) == 0)
587 current->state = TASK_RUNNING;
588 mutex_lock(&module_mutex);
592 sys_delete_module(const char __user *name_user, unsigned int flags)
595 char name[MODULE_NAME_LEN];
598 if (!capable(CAP_SYS_MODULE))
601 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
603 name[MODULE_NAME_LEN-1] = '\0';
605 if (mutex_lock_interruptible(&module_mutex) != 0)
608 mod = find_module(name);
614 if (!list_empty(&mod->modules_which_use_me)) {
615 /* Other modules depend on us: get rid of them first. */
620 /* Doing init or already dying? */
621 if (mod->state != MODULE_STATE_LIVE) {
622 /* FIXME: if (force), slam module count and wake up
624 DEBUGP("%s already dying\n", mod->name);
629 /* If it has an init func, it must have an exit func to unload */
630 if ((mod->init != NULL && mod->exit == NULL)
632 forced = try_force_unload(flags);
634 /* This module can't be removed */
640 /* Set this up before setting mod->state */
641 mod->waiter = current;
643 /* Stop the machine so refcounts can't move and disable module. */
644 ret = try_stop_module(mod, flags, &forced);
648 /* Never wait if forced. */
649 if (!forced && module_refcount(mod) != 0)
650 wait_for_zero_refcount(mod);
652 /* Final destruction now noone is using it. */
653 if (mod->exit != NULL) {
654 mutex_unlock(&module_mutex);
656 mutex_lock(&module_mutex);
661 mutex_unlock(&module_mutex);
665 static void print_unload_info(struct seq_file *m, struct module *mod)
667 struct module_use *use;
668 int printed_something = 0;
670 seq_printf(m, " %u ", module_refcount(mod));
672 /* Always include a trailing , so userspace can differentiate
673 between this and the old multi-field proc format. */
674 list_for_each_entry(use, &mod->modules_which_use_me, list) {
675 printed_something = 1;
676 seq_printf(m, "%s,", use->module_which_uses->name);
680 printed_something = 1;
681 seq_printf(m, "[unsafe],");
684 if (mod->init != NULL && mod->exit == NULL) {
685 printed_something = 1;
686 seq_printf(m, "[permanent],");
689 if (!printed_something)
693 void __symbol_put(const char *symbol)
695 struct module *owner;
697 const unsigned long *crc;
699 spin_lock_irqsave(&modlist_lock, flags);
700 if (!__find_symbol(symbol, &owner, &crc, 1))
703 spin_unlock_irqrestore(&modlist_lock, flags);
705 EXPORT_SYMBOL(__symbol_put);
707 void symbol_put_addr(void *addr)
709 struct module *modaddr;
711 if (core_kernel_text((unsigned long)addr))
714 if (!(modaddr = module_text_address((unsigned long)addr)))
718 EXPORT_SYMBOL_GPL(symbol_put_addr);
720 static ssize_t show_refcnt(struct module_attribute *mattr,
721 struct module *mod, char *buffer)
723 /* sysfs holds a reference */
724 return sprintf(buffer, "%u\n", module_refcount(mod)-1);
727 static struct module_attribute refcnt = {
728 .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE },
732 #else /* !CONFIG_MODULE_UNLOAD */
733 static void print_unload_info(struct seq_file *m, struct module *mod)
735 /* We don't know the usage count, or what modules are using. */
736 seq_printf(m, " - -");
739 static inline void module_unload_free(struct module *mod)
743 static inline int use_module(struct module *a, struct module *b)
745 return strong_try_module_get(b);
748 static inline void module_unload_init(struct module *mod)
751 #endif /* CONFIG_MODULE_UNLOAD */
753 static struct module_attribute *modinfo_attrs[] = {
756 #ifdef CONFIG_MODULE_UNLOAD
762 static const char vermagic[] = VERMAGIC_STRING;
764 #ifdef CONFIG_MODVERSIONS
765 static int check_version(Elf_Shdr *sechdrs,
766 unsigned int versindex,
769 const unsigned long *crc)
771 unsigned int i, num_versions;
772 struct modversion_info *versions;
774 /* Exporting module didn't supply crcs? OK, we're already tainted. */
778 versions = (void *) sechdrs[versindex].sh_addr;
779 num_versions = sechdrs[versindex].sh_size
780 / sizeof(struct modversion_info);
782 for (i = 0; i < num_versions; i++) {
783 if (strcmp(versions[i].name, symname) != 0)
786 if (versions[i].crc == *crc)
788 printk("%s: disagrees about version of symbol %s\n",
790 DEBUGP("Found checksum %lX vs module %lX\n",
791 *crc, versions[i].crc);
794 /* Not in module's version table. OK, but that taints the kernel. */
795 if (!(tainted & TAINT_FORCED_MODULE)) {
796 printk("%s: no version for \"%s\" found: kernel tainted.\n",
798 add_taint(TAINT_FORCED_MODULE);
803 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
804 unsigned int versindex,
807 const unsigned long *crc;
808 struct module *owner;
810 if (!__find_symbol("struct_module", &owner, &crc, 1))
812 return check_version(sechdrs, versindex, "struct_module", mod,
816 /* First part is kernel version, which we ignore. */
817 static inline int same_magic(const char *amagic, const char *bmagic)
819 amagic += strcspn(amagic, " ");
820 bmagic += strcspn(bmagic, " ");
821 return strcmp(amagic, bmagic) == 0;
824 static inline int check_version(Elf_Shdr *sechdrs,
825 unsigned int versindex,
828 const unsigned long *crc)
833 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
834 unsigned int versindex,
840 static inline int same_magic(const char *amagic, const char *bmagic)
842 return strcmp(amagic, bmagic) == 0;
844 #endif /* CONFIG_MODVERSIONS */
846 /* Resolve a symbol for this module. I.e. if we find one, record usage.
847 Must be holding module_mutex. */
848 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
849 unsigned int versindex,
853 struct module *owner;
855 const unsigned long *crc;
857 ret = __find_symbol(name, &owner, &crc, mod->license_gplok);
859 /* use_module can fail due to OOM, or module unloading */
860 if (!check_version(sechdrs, versindex, name, mod, crc) ||
861 !use_module(mod, owner))
869 * /sys/module/foo/sections stuff
870 * J. Corbet <corbet@lwn.net>
872 #ifdef CONFIG_KALLSYMS
873 static ssize_t module_sect_show(struct module_attribute *mattr,
874 struct module *mod, char *buf)
876 struct module_sect_attr *sattr =
877 container_of(mattr, struct module_sect_attr, mattr);
878 return sprintf(buf, "0x%lx\n", sattr->address);
881 static void add_sect_attrs(struct module *mod, unsigned int nsect,
882 char *secstrings, Elf_Shdr *sechdrs)
884 unsigned int nloaded = 0, i, size[2];
885 struct module_sect_attrs *sect_attrs;
886 struct module_sect_attr *sattr;
887 struct attribute **gattr;
889 /* Count loaded sections and allocate structures */
890 for (i = 0; i < nsect; i++)
891 if (sechdrs[i].sh_flags & SHF_ALLOC)
893 size[0] = ALIGN(sizeof(*sect_attrs)
894 + nloaded * sizeof(sect_attrs->attrs[0]),
895 sizeof(sect_attrs->grp.attrs[0]));
896 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
897 if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL)))
900 /* Setup section attributes. */
901 sect_attrs->grp.name = "sections";
902 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
904 sattr = §_attrs->attrs[0];
905 gattr = §_attrs->grp.attrs[0];
906 for (i = 0; i < nsect; i++) {
907 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
909 sattr->address = sechdrs[i].sh_addr;
910 strlcpy(sattr->name, secstrings + sechdrs[i].sh_name,
911 MODULE_SECT_NAME_LEN);
912 sattr->mattr.show = module_sect_show;
913 sattr->mattr.store = NULL;
914 sattr->mattr.attr.name = sattr->name;
915 sattr->mattr.attr.owner = mod;
916 sattr->mattr.attr.mode = S_IRUGO;
917 *(gattr++) = &(sattr++)->mattr.attr;
921 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
924 mod->sect_attrs = sect_attrs;
930 static void remove_sect_attrs(struct module *mod)
932 if (mod->sect_attrs) {
933 sysfs_remove_group(&mod->mkobj.kobj,
934 &mod->sect_attrs->grp);
935 /* We are positive that no one is using any sect attrs
936 * at this point. Deallocate immediately. */
937 kfree(mod->sect_attrs);
938 mod->sect_attrs = NULL;
944 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
945 char *sectstrings, Elf_Shdr *sechdrs)
949 static inline void remove_sect_attrs(struct module *mod)
952 #endif /* CONFIG_KALLSYMS */
954 static int module_add_modinfo_attrs(struct module *mod)
956 struct module_attribute *attr;
957 struct module_attribute *temp_attr;
961 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
962 (ARRAY_SIZE(modinfo_attrs) + 1)),
964 if (!mod->modinfo_attrs)
967 temp_attr = mod->modinfo_attrs;
968 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
970 (attr->test && attr->test(mod))) {
971 memcpy(temp_attr, attr, sizeof(*temp_attr));
972 temp_attr->attr.owner = mod;
973 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
980 static void module_remove_modinfo_attrs(struct module *mod)
982 struct module_attribute *attr;
985 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
986 /* pick a field to test for end of list */
987 if (!attr->attr.name)
989 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
993 kfree(mod->modinfo_attrs);
996 static int mod_sysfs_setup(struct module *mod,
997 struct kernel_param *kparam,
998 unsigned int num_params)
1002 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1003 err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
1006 kobj_set_kset_s(&mod->mkobj, module_subsys);
1007 mod->mkobj.mod = mod;
1008 err = kobject_register(&mod->mkobj.kobj);
1012 err = module_param_sysfs_setup(mod, kparam, num_params);
1016 err = module_add_modinfo_attrs(mod);
1023 kobject_unregister(&mod->mkobj.kobj);
1028 static void mod_kobject_remove(struct module *mod)
1030 module_remove_modinfo_attrs(mod);
1031 module_param_sysfs_remove(mod);
1033 kobject_unregister(&mod->mkobj.kobj);
1037 * unlink the module with the whole machine is stopped with interrupts off
1038 * - this defends against kallsyms not taking locks
1040 static int __unlink_module(void *_mod)
1042 struct module *mod = _mod;
1043 list_del(&mod->list);
1047 /* Free a module, remove from lists, etc (must hold module mutex). */
1048 static void free_module(struct module *mod)
1050 /* Delete from various lists */
1051 stop_machine_run(__unlink_module, mod, NR_CPUS);
1052 remove_sect_attrs(mod);
1053 mod_kobject_remove(mod);
1055 unwind_remove_table(mod->unwind_info, 0);
1057 /* Arch-specific cleanup. */
1058 module_arch_cleanup(mod);
1060 /* Module unload stuff */
1061 module_unload_free(mod);
1063 /* This may be NULL, but that's OK */
1064 module_free(mod, mod->module_init);
1067 percpu_modfree(mod->percpu);
1069 /* Finally, free the core (containing the module structure) */
1070 module_free(mod, mod->module_core);
1073 void *__symbol_get(const char *symbol)
1075 struct module *owner;
1076 unsigned long value, flags;
1077 const unsigned long *crc;
1079 spin_lock_irqsave(&modlist_lock, flags);
1080 value = __find_symbol(symbol, &owner, &crc, 1);
1081 if (value && !strong_try_module_get(owner))
1083 spin_unlock_irqrestore(&modlist_lock, flags);
1085 return (void *)value;
1087 EXPORT_SYMBOL_GPL(__symbol_get);
1090 * Ensure that an exported symbol [global namespace] does not already exist
1091 * in the Kernel or in some other modules exported symbol table.
1093 static int verify_export_symbols(struct module *mod)
1095 const char *name = NULL;
1096 unsigned long i, ret = 0;
1097 struct module *owner;
1098 const unsigned long *crc;
1100 for (i = 0; i < mod->num_syms; i++)
1101 if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
1102 name = mod->syms[i].name;
1107 for (i = 0; i < mod->num_gpl_syms; i++)
1108 if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
1109 name = mod->gpl_syms[i].name;
1116 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1117 mod->name, name, module_name(owner));
1122 /* Change all symbols so that sh_value encodes the pointer directly. */
1123 static int simplify_symbols(Elf_Shdr *sechdrs,
1124 unsigned int symindex,
1126 unsigned int versindex,
1127 unsigned int pcpuindex,
1130 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1131 unsigned long secbase;
1132 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1135 for (i = 1; i < n; i++) {
1136 switch (sym[i].st_shndx) {
1138 /* We compiled with -fno-common. These are not
1139 supposed to happen. */
1140 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1141 printk("%s: please compile with -fno-common\n",
1147 /* Don't need to do anything */
1148 DEBUGP("Absolute symbol: 0x%08lx\n",
1149 (long)sym[i].st_value);
1154 = resolve_symbol(sechdrs, versindex,
1155 strtab + sym[i].st_name, mod);
1157 /* Ok if resolved. */
1158 if (sym[i].st_value != 0)
1161 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1164 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1165 mod->name, strtab + sym[i].st_name);
1170 /* Divert to percpu allocation if a percpu var. */
1171 if (sym[i].st_shndx == pcpuindex)
1172 secbase = (unsigned long)mod->percpu;
1174 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1175 sym[i].st_value += secbase;
1183 /* Update size with this section: return offset. */
1184 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1188 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1189 *size = ret + sechdr->sh_size;
1193 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1194 might -- code, read-only data, read-write data, small data. Tally
1195 sizes, and place the offsets into sh_entsize fields: high bit means it
1197 static void layout_sections(struct module *mod,
1198 const Elf_Ehdr *hdr,
1200 const char *secstrings)
1202 static unsigned long const masks[][2] = {
1203 /* NOTE: all executable code must be the first section
1204 * in this array; otherwise modify the text_size
1205 * finder in the two loops below */
1206 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1207 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1208 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1209 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1213 for (i = 0; i < hdr->e_shnum; i++)
1214 sechdrs[i].sh_entsize = ~0UL;
1216 DEBUGP("Core section allocation order:\n");
1217 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1218 for (i = 0; i < hdr->e_shnum; ++i) {
1219 Elf_Shdr *s = &sechdrs[i];
1221 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1222 || (s->sh_flags & masks[m][1])
1223 || s->sh_entsize != ~0UL
1224 || strncmp(secstrings + s->sh_name,
1227 s->sh_entsize = get_offset(&mod->core_size, s);
1228 DEBUGP("\t%s\n", secstrings + s->sh_name);
1231 mod->core_text_size = mod->core_size;
1234 DEBUGP("Init section allocation order:\n");
1235 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1236 for (i = 0; i < hdr->e_shnum; ++i) {
1237 Elf_Shdr *s = &sechdrs[i];
1239 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1240 || (s->sh_flags & masks[m][1])
1241 || s->sh_entsize != ~0UL
1242 || strncmp(secstrings + s->sh_name,
1245 s->sh_entsize = (get_offset(&mod->init_size, s)
1246 | INIT_OFFSET_MASK);
1247 DEBUGP("\t%s\n", secstrings + s->sh_name);
1250 mod->init_text_size = mod->init_size;
1254 static inline int license_is_gpl_compatible(const char *license)
1256 return (strcmp(license, "GPL") == 0
1257 || strcmp(license, "GPL v2") == 0
1258 || strcmp(license, "GPL and additional rights") == 0
1259 || strcmp(license, "Dual BSD/GPL") == 0
1260 || strcmp(license, "Dual MIT/GPL") == 0
1261 || strcmp(license, "Dual MPL/GPL") == 0);
1264 static void set_license(struct module *mod, const char *license)
1267 license = "unspecified";
1269 mod->license_gplok = license_is_gpl_compatible(license);
1270 if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) {
1271 printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
1272 mod->name, license);
1273 add_taint(TAINT_PROPRIETARY_MODULE);
1277 /* Parse tag=value strings from .modinfo section */
1278 static char *next_string(char *string, unsigned long *secsize)
1280 /* Skip non-zero chars */
1283 if ((*secsize)-- <= 1)
1287 /* Skip any zero padding. */
1288 while (!string[0]) {
1290 if ((*secsize)-- <= 1)
1296 static char *get_modinfo(Elf_Shdr *sechdrs,
1301 unsigned int taglen = strlen(tag);
1302 unsigned long size = sechdrs[info].sh_size;
1304 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1305 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1306 return p + taglen + 1;
1311 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1312 unsigned int infoindex)
1314 struct module_attribute *attr;
1317 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1320 get_modinfo(sechdrs,
1326 #ifdef CONFIG_KALLSYMS
1327 int is_exported(const char *name, const struct module *mod)
1329 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1332 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1339 static char elf_type(const Elf_Sym *sym,
1341 const char *secstrings,
1344 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1345 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1350 if (sym->st_shndx == SHN_UNDEF)
1352 if (sym->st_shndx == SHN_ABS)
1354 if (sym->st_shndx >= SHN_LORESERVE)
1356 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1358 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1359 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1360 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1362 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1367 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1368 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1373 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1374 ".debug", strlen(".debug")) == 0)
1379 static void add_kallsyms(struct module *mod,
1381 unsigned int symindex,
1382 unsigned int strindex,
1383 const char *secstrings)
1387 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1388 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1389 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1391 /* Set types up while we still have access to sections. */
1392 for (i = 0; i < mod->num_symtab; i++)
1393 mod->symtab[i].st_info
1394 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1397 static inline void add_kallsyms(struct module *mod,
1399 unsigned int symindex,
1400 unsigned int strindex,
1401 const char *secstrings)
1404 #endif /* CONFIG_KALLSYMS */
1406 /* Allocate and load the module: note that size of section 0 is always
1407 zero, and we rely on this for optional sections. */
1408 static struct module *load_module(void __user *umod,
1410 const char __user *uargs)
1414 char *secstrings, *args, *modmagic, *strtab = NULL;
1415 unsigned int i, symindex = 0, strindex = 0, setupindex, exindex,
1416 exportindex, modindex, obsparmindex, infoindex, gplindex,
1417 crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex,
1418 gplfuturecrcindex, unwindex = 0;
1421 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1422 struct exception_table_entry *extable;
1423 mm_segment_t old_fs;
1425 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1427 if (len < sizeof(*hdr))
1428 return ERR_PTR(-ENOEXEC);
1430 /* Suck in entire file: we'll want most of it. */
1431 /* vmalloc barfs on "unusual" numbers. Check here */
1432 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1433 return ERR_PTR(-ENOMEM);
1434 if (copy_from_user(hdr, umod, len) != 0) {
1439 /* Sanity checks against insmoding binaries or wrong arch,
1440 weird elf version */
1441 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1442 || hdr->e_type != ET_REL
1443 || !elf_check_arch(hdr)
1444 || hdr->e_shentsize != sizeof(*sechdrs)) {
1449 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1452 /* Convenience variables */
1453 sechdrs = (void *)hdr + hdr->e_shoff;
1454 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1455 sechdrs[0].sh_addr = 0;
1457 for (i = 1; i < hdr->e_shnum; i++) {
1458 if (sechdrs[i].sh_type != SHT_NOBITS
1459 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1462 /* Mark all sections sh_addr with their address in the
1464 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1466 /* Internal symbols and strings. */
1467 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1469 strindex = sechdrs[i].sh_link;
1470 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1472 #ifndef CONFIG_MODULE_UNLOAD
1473 /* Don't load .exit sections */
1474 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1475 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1479 modindex = find_sec(hdr, sechdrs, secstrings,
1480 ".gnu.linkonce.this_module");
1482 printk(KERN_WARNING "No module found in object\n");
1486 mod = (void *)sechdrs[modindex].sh_addr;
1488 if (symindex == 0) {
1489 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1495 /* Optional sections */
1496 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1497 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1498 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1499 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1500 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1501 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1502 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1503 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1504 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1505 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1506 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1507 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1508 #ifdef ARCH_UNWIND_SECTION_NAME
1509 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1512 /* Don't keep modinfo section */
1513 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1514 #ifdef CONFIG_KALLSYMS
1515 /* Keep symbol and string tables for decoding later. */
1516 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1517 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1520 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1522 /* Check module struct version now, before we try to use module. */
1523 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1528 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1529 /* This is allowed: modprobe --force will invalidate it. */
1531 add_taint(TAINT_FORCED_MODULE);
1532 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1534 } else if (!same_magic(modmagic, vermagic)) {
1535 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1536 mod->name, modmagic, vermagic);
1541 /* Now copy in args */
1542 args = strndup_user(uargs, ~0UL >> 1);
1544 err = PTR_ERR(args);
1548 if (find_module(mod->name)) {
1553 mod->state = MODULE_STATE_COMING;
1555 /* Allow arches to frob section contents and sizes. */
1556 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1561 /* We have a special allocation for this section. */
1562 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1563 sechdrs[pcpuindex].sh_addralign,
1569 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1570 mod->percpu = percpu;
1573 /* Determine total sizes, and put offsets in sh_entsize. For now
1574 this is done generically; there doesn't appear to be any
1575 special cases for the architectures. */
1576 layout_sections(mod, hdr, sechdrs, secstrings);
1578 /* Do the allocs. */
1579 ptr = module_alloc(mod->core_size);
1584 memset(ptr, 0, mod->core_size);
1585 mod->module_core = ptr;
1587 ptr = module_alloc(mod->init_size);
1588 if (!ptr && mod->init_size) {
1592 memset(ptr, 0, mod->init_size);
1593 mod->module_init = ptr;
1595 /* Transfer each section which specifies SHF_ALLOC */
1596 DEBUGP("final section addresses:\n");
1597 for (i = 0; i < hdr->e_shnum; i++) {
1600 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1603 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1604 dest = mod->module_init
1605 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1607 dest = mod->module_core + sechdrs[i].sh_entsize;
1609 if (sechdrs[i].sh_type != SHT_NOBITS)
1610 memcpy(dest, (void *)sechdrs[i].sh_addr,
1611 sechdrs[i].sh_size);
1612 /* Update sh_addr to point to copy in image. */
1613 sechdrs[i].sh_addr = (unsigned long)dest;
1614 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1616 /* Module has been moved. */
1617 mod = (void *)sechdrs[modindex].sh_addr;
1619 /* Now we've moved module, initialize linked lists, etc. */
1620 module_unload_init(mod);
1622 /* Set up license info based on the info section */
1623 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1625 if (strcmp(mod->name, "ndiswrapper") == 0)
1626 add_taint(TAINT_PROPRIETARY_MODULE);
1627 if (strcmp(mod->name, "driverloader") == 0)
1628 add_taint(TAINT_PROPRIETARY_MODULE);
1630 /* Set up MODINFO_ATTR fields */
1631 setup_modinfo(mod, sechdrs, infoindex);
1633 /* Fix up syms, so that st_value is a pointer to location. */
1634 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1639 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1640 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1641 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1643 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1644 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1645 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1647 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1648 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1649 sizeof(*mod->gpl_future_syms);
1650 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1651 if (gplfuturecrcindex)
1652 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
1654 #ifdef CONFIG_MODVERSIONS
1655 if ((mod->num_syms && !crcindex) ||
1656 (mod->num_gpl_syms && !gplcrcindex) ||
1657 (mod->num_gpl_future_syms && !gplfuturecrcindex)) {
1658 printk(KERN_WARNING "%s: No versions for exported symbols."
1659 " Tainting kernel.\n", mod->name);
1660 add_taint(TAINT_FORCED_MODULE);
1664 /* Now do relocations. */
1665 for (i = 1; i < hdr->e_shnum; i++) {
1666 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1667 unsigned int info = sechdrs[i].sh_info;
1669 /* Not a valid relocation section? */
1670 if (info >= hdr->e_shnum)
1673 /* Don't bother with non-allocated sections */
1674 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1677 if (sechdrs[i].sh_type == SHT_REL)
1678 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1679 else if (sechdrs[i].sh_type == SHT_RELA)
1680 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1686 /* Find duplicate symbols */
1687 err = verify_export_symbols(mod);
1692 /* Set up and sort exception table */
1693 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1694 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1695 sort_extable(extable, extable + mod->num_exentries);
1697 /* Finally, copy percpu area over. */
1698 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
1699 sechdrs[pcpuindex].sh_size);
1701 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
1703 err = module_finalize(hdr, sechdrs, mod);
1707 /* flush the icache in correct context */
1712 * Flush the instruction cache, since we've played with text.
1713 * Do it before processing of module parameters, so the module
1714 * can provide parameter accessor functions of its own.
1716 if (mod->module_init)
1717 flush_icache_range((unsigned long)mod->module_init,
1718 (unsigned long)mod->module_init
1720 flush_icache_range((unsigned long)mod->module_core,
1721 (unsigned long)mod->module_core + mod->core_size);
1727 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
1730 /* Size of section 0 is 0, so this works well if no params */
1731 err = parse_args(mod->name, mod->args,
1732 (struct kernel_param *)
1733 sechdrs[setupindex].sh_addr,
1734 sechdrs[setupindex].sh_size
1735 / sizeof(struct kernel_param),
1740 err = mod_sysfs_setup(mod,
1741 (struct kernel_param *)
1742 sechdrs[setupindex].sh_addr,
1743 sechdrs[setupindex].sh_size
1744 / sizeof(struct kernel_param));
1747 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
1749 /* Size of section 0 is 0, so this works well if no unwind info. */
1750 mod->unwind_info = unwind_add_table(mod,
1751 (void *)sechdrs[unwindex].sh_addr,
1752 sechdrs[unwindex].sh_size);
1754 /* Get rid of temporary copy */
1761 module_arch_cleanup(mod);
1763 module_unload_free(mod);
1764 module_free(mod, mod->module_init);
1766 module_free(mod, mod->module_core);
1769 percpu_modfree(percpu);
1774 return ERR_PTR(err);
1777 printk(KERN_ERR "Module len %lu truncated\n", len);
1783 * link the module with the whole machine is stopped with interrupts off
1784 * - this defends against kallsyms not taking locks
1786 static int __link_module(void *_mod)
1788 struct module *mod = _mod;
1789 list_add(&mod->list, &modules);
1793 /* This is where the real work happens */
1795 sys_init_module(void __user *umod,
1797 const char __user *uargs)
1802 /* Must have permission */
1803 if (!capable(CAP_SYS_MODULE))
1806 /* Only one module load at a time, please */
1807 if (mutex_lock_interruptible(&module_mutex) != 0)
1810 /* Do all the hard work */
1811 mod = load_module(umod, len, uargs);
1813 mutex_unlock(&module_mutex);
1814 return PTR_ERR(mod);
1817 /* Now sew it into the lists. They won't access us, since
1818 strong_try_module_get() will fail. */
1819 stop_machine_run(__link_module, mod, NR_CPUS);
1821 /* Drop lock so they can recurse */
1822 mutex_unlock(&module_mutex);
1824 blocking_notifier_call_chain(&module_notify_list,
1825 MODULE_STATE_COMING, mod);
1827 /* Start the module */
1828 if (mod->init != NULL)
1831 /* Init routine failed: abort. Try to protect us from
1832 buggy refcounters. */
1833 mod->state = MODULE_STATE_GOING;
1834 synchronize_sched();
1836 printk(KERN_ERR "%s: module is now stuck!\n",
1840 mutex_lock(&module_mutex);
1842 mutex_unlock(&module_mutex);
1847 /* Now it's a first class citizen! */
1848 mutex_lock(&module_mutex);
1849 mod->state = MODULE_STATE_LIVE;
1850 /* Drop initial reference. */
1852 unwind_remove_table(mod->unwind_info, 1);
1853 module_free(mod, mod->module_init);
1854 mod->module_init = NULL;
1856 mod->init_text_size = 0;
1857 mutex_unlock(&module_mutex);
1862 static inline int within(unsigned long addr, void *start, unsigned long size)
1864 return ((void *)addr >= start && (void *)addr < start + size);
1867 #ifdef CONFIG_KALLSYMS
1869 * This ignores the intensely annoying "mapping symbols" found
1870 * in ARM ELF files: $a, $t and $d.
1872 static inline int is_arm_mapping_symbol(const char *str)
1874 return str[0] == '$' && strchr("atd", str[1])
1875 && (str[2] == '\0' || str[2] == '.');
1878 static const char *get_ksymbol(struct module *mod,
1880 unsigned long *size,
1881 unsigned long *offset)
1883 unsigned int i, best = 0;
1884 unsigned long nextval;
1886 /* At worse, next value is at end of module */
1887 if (within(addr, mod->module_init, mod->init_size))
1888 nextval = (unsigned long)mod->module_init+mod->init_text_size;
1890 nextval = (unsigned long)mod->module_core+mod->core_text_size;
1892 /* Scan for closest preceeding symbol, and next symbol. (ELF
1893 starts real symbols at 1). */
1894 for (i = 1; i < mod->num_symtab; i++) {
1895 if (mod->symtab[i].st_shndx == SHN_UNDEF)
1898 /* We ignore unnamed symbols: they're uninformative
1899 * and inserted at a whim. */
1900 if (mod->symtab[i].st_value <= addr
1901 && mod->symtab[i].st_value > mod->symtab[best].st_value
1902 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
1903 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
1905 if (mod->symtab[i].st_value > addr
1906 && mod->symtab[i].st_value < nextval
1907 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
1908 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
1909 nextval = mod->symtab[i].st_value;
1915 *size = nextval - mod->symtab[best].st_value;
1916 *offset = addr - mod->symtab[best].st_value;
1917 return mod->strtab + mod->symtab[best].st_name;
1920 /* For kallsyms to ask for address resolution. NULL means not found.
1921 We don't lock, as this is used for oops resolution and races are a
1923 const char *module_address_lookup(unsigned long addr,
1924 unsigned long *size,
1925 unsigned long *offset,
1930 list_for_each_entry(mod, &modules, list) {
1931 if (within(addr, mod->module_init, mod->init_size)
1932 || within(addr, mod->module_core, mod->core_size)) {
1933 *modname = mod->name;
1934 return get_ksymbol(mod, addr, size, offset);
1940 struct module *module_get_kallsym(unsigned int symnum,
1941 unsigned long *value,
1947 mutex_lock(&module_mutex);
1948 list_for_each_entry(mod, &modules, list) {
1949 if (symnum < mod->num_symtab) {
1950 *value = mod->symtab[symnum].st_value;
1951 *type = mod->symtab[symnum].st_info;
1953 mod->strtab + mod->symtab[symnum].st_name,
1955 mutex_unlock(&module_mutex);
1958 symnum -= mod->num_symtab;
1960 mutex_unlock(&module_mutex);
1964 static unsigned long mod_find_symname(struct module *mod, const char *name)
1968 for (i = 0; i < mod->num_symtab; i++)
1969 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
1970 mod->symtab[i].st_info != 'U')
1971 return mod->symtab[i].st_value;
1975 /* Look for this name: can be of form module:name. */
1976 unsigned long module_kallsyms_lookup_name(const char *name)
1980 unsigned long ret = 0;
1982 /* Don't lock: we're in enough trouble already. */
1983 if ((colon = strchr(name, ':')) != NULL) {
1985 if ((mod = find_module(name)) != NULL)
1986 ret = mod_find_symname(mod, colon+1);
1989 list_for_each_entry(mod, &modules, list)
1990 if ((ret = mod_find_symname(mod, name)) != 0)
1995 #endif /* CONFIG_KALLSYMS */
1997 /* Called by the /proc file system to return a list of modules. */
1998 static void *m_start(struct seq_file *m, loff_t *pos)
2000 struct list_head *i;
2003 mutex_lock(&module_mutex);
2004 list_for_each(i, &modules) {
2013 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2015 struct list_head *i = p;
2017 if (i->next == &modules)
2022 static void m_stop(struct seq_file *m, void *p)
2024 mutex_unlock(&module_mutex);
2027 static int m_show(struct seq_file *m, void *p)
2029 struct module *mod = list_entry(p, struct module, list);
2030 seq_printf(m, "%s %lu",
2031 mod->name, mod->init_size + mod->core_size);
2032 print_unload_info(m, mod);
2034 /* Informative for users. */
2035 seq_printf(m, " %s",
2036 mod->state == MODULE_STATE_GOING ? "Unloading":
2037 mod->state == MODULE_STATE_COMING ? "Loading":
2039 /* Used by oprofile and other similar tools. */
2040 seq_printf(m, " 0x%p", mod->module_core);
2042 seq_printf(m, "\n");
2046 /* Format: modulename size refcount deps address
2048 Where refcount is a number or -, and deps is a comma-separated list
2051 struct seq_operations modules_op = {
2058 /* Given an address, look for it in the module exception tables. */
2059 const struct exception_table_entry *search_module_extables(unsigned long addr)
2061 unsigned long flags;
2062 const struct exception_table_entry *e = NULL;
2065 spin_lock_irqsave(&modlist_lock, flags);
2066 list_for_each_entry(mod, &modules, list) {
2067 if (mod->num_exentries == 0)
2070 e = search_extable(mod->extable,
2071 mod->extable + mod->num_exentries - 1,
2076 spin_unlock_irqrestore(&modlist_lock, flags);
2078 /* Now, if we found one, we are running inside it now, hence
2079 we cannot unload the module, hence no refcnt needed. */
2083 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2084 struct module *__module_text_address(unsigned long addr)
2088 list_for_each_entry(mod, &modules, list)
2089 if (within(addr, mod->module_init, mod->init_text_size)
2090 || within(addr, mod->module_core, mod->core_text_size))
2095 struct module *module_text_address(unsigned long addr)
2098 unsigned long flags;
2100 spin_lock_irqsave(&modlist_lock, flags);
2101 mod = __module_text_address(addr);
2102 spin_unlock_irqrestore(&modlist_lock, flags);
2107 /* Don't grab lock, we're oopsing. */
2108 void print_modules(void)
2112 printk("Modules linked in:");
2113 list_for_each_entry(mod, &modules, list)
2114 printk(" %s", mod->name);
2118 void module_add_driver(struct module *mod, struct device_driver *drv)
2123 /* Don't check return code; this call is idempotent */
2124 sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module");
2126 EXPORT_SYMBOL(module_add_driver);
2128 void module_remove_driver(struct device_driver *drv)
2132 sysfs_remove_link(&drv->kobj, "module");
2134 EXPORT_SYMBOL(module_remove_driver);
2136 #ifdef CONFIG_MODVERSIONS
2137 /* Generate the signature for struct module here, too, for modversions. */
2138 void struct_module(struct module *mod) { return; }
2139 EXPORT_SYMBOL(struct_module);