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 <asm/uaccess.h>
44 #include <asm/semaphore.h>
45 #include <asm/cacheflush.h>
50 #define DEBUGP(fmt , a...)
53 #ifndef ARCH_SHF_SMALL
54 #define ARCH_SHF_SMALL 0
57 /* If this is set, the section belongs in the init part of the module */
58 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
60 /* Protects module list */
61 static DEFINE_SPINLOCK(modlist_lock);
63 /* List of modules, protected by module_mutex AND modlist_lock */
64 static DEFINE_MUTEX(module_mutex);
65 static LIST_HEAD(modules);
67 static DEFINE_MUTEX(notify_mutex);
68 static struct notifier_block * module_notify_list;
70 int register_module_notifier(struct notifier_block * nb)
73 mutex_lock(¬ify_mutex);
74 err = notifier_chain_register(&module_notify_list, nb);
75 mutex_unlock(¬ify_mutex);
78 EXPORT_SYMBOL(register_module_notifier);
80 int unregister_module_notifier(struct notifier_block * nb)
83 mutex_lock(¬ify_mutex);
84 err = notifier_chain_unregister(&module_notify_list, nb);
85 mutex_unlock(¬ify_mutex);
88 EXPORT_SYMBOL(unregister_module_notifier);
90 /* We require a truly strong try_module_get() */
91 static inline int strong_try_module_get(struct module *mod)
93 if (mod && mod->state == MODULE_STATE_COMING)
95 return try_module_get(mod);
98 /* A thread that wants to hold a reference to a module only while it
99 * is running can call ths to safely exit.
100 * nfsd and lockd use this.
102 void __module_put_and_exit(struct module *mod, long code)
107 EXPORT_SYMBOL(__module_put_and_exit);
109 /* Find a module section: 0 means not found. */
110 static unsigned int find_sec(Elf_Ehdr *hdr,
112 const char *secstrings,
117 for (i = 1; i < hdr->e_shnum; i++)
118 /* Alloc bit cleared means "ignore it." */
119 if ((sechdrs[i].sh_flags & SHF_ALLOC)
120 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
125 /* Provided by the linker */
126 extern const struct kernel_symbol __start___ksymtab[];
127 extern const struct kernel_symbol __stop___ksymtab[];
128 extern const struct kernel_symbol __start___ksymtab_gpl[];
129 extern const struct kernel_symbol __stop___ksymtab_gpl[];
130 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
131 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
132 extern const unsigned long __start___kcrctab[];
133 extern const unsigned long __start___kcrctab_gpl[];
134 extern const unsigned long __start___kcrctab_gpl_future[];
136 #ifndef CONFIG_MODVERSIONS
137 #define symversion(base, idx) NULL
139 #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL)
142 /* lookup symbol in given range of kernel_symbols */
143 static const struct kernel_symbol *lookup_symbol(const char *name,
144 const struct kernel_symbol *start,
145 const struct kernel_symbol *stop)
147 const struct kernel_symbol *ks = start;
148 for (; ks < stop; ks++)
149 if (strcmp(ks->name, name) == 0)
154 /* Find a symbol, return value, crc and module which owns it */
155 static unsigned long __find_symbol(const char *name,
156 struct module **owner,
157 const unsigned long **crc,
161 const struct kernel_symbol *ks;
163 /* Core kernel first. */
165 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
167 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
171 ks = lookup_symbol(name, __start___ksymtab_gpl,
172 __stop___ksymtab_gpl);
174 *crc = symversion(__start___kcrctab_gpl,
175 (ks - __start___ksymtab_gpl));
179 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
180 __stop___ksymtab_gpl_future);
183 printk(KERN_WARNING "Symbol %s is being used "
184 "by a non-GPL module, which will not "
185 "be allowed in the future\n", name);
186 printk(KERN_WARNING "Please see the file "
187 "Documentation/feature-removal-schedule.txt "
188 "in the kernel source tree for more "
191 *crc = symversion(__start___kcrctab_gpl_future,
192 (ks - __start___ksymtab_gpl_future));
196 /* Now try modules. */
197 list_for_each_entry(mod, &modules, list) {
199 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
201 *crc = symversion(mod->crcs, (ks - mod->syms));
206 ks = lookup_symbol(name, mod->gpl_syms,
207 mod->gpl_syms + mod->num_gpl_syms);
209 *crc = symversion(mod->gpl_crcs,
210 (ks - mod->gpl_syms));
214 ks = lookup_symbol(name, mod->gpl_future_syms,
215 (mod->gpl_future_syms +
216 mod->num_gpl_future_syms));
219 printk(KERN_WARNING "Symbol %s is being used "
220 "by a non-GPL module, which will not "
221 "be allowed in the future\n", name);
222 printk(KERN_WARNING "Please see the file "
223 "Documentation/feature-removal-schedule.txt "
224 "in the kernel source tree for more "
227 *crc = symversion(mod->gpl_future_crcs,
228 (ks - mod->gpl_future_syms));
232 DEBUGP("Failed to find symbol %s\n", name);
236 /* Search for module by name: must hold module_mutex. */
237 static struct module *find_module(const char *name)
241 list_for_each_entry(mod, &modules, list) {
242 if (strcmp(mod->name, name) == 0)
249 /* Number of blocks used and allocated. */
250 static unsigned int pcpu_num_used, pcpu_num_allocated;
251 /* Size of each block. -ve means used. */
252 static int *pcpu_size;
254 static int split_block(unsigned int i, unsigned short size)
256 /* Reallocation required? */
257 if (pcpu_num_used + 1 > pcpu_num_allocated) {
258 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2,
263 memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated);
264 pcpu_num_allocated *= 2;
269 /* Insert a new subblock */
270 memmove(&pcpu_size[i+1], &pcpu_size[i],
271 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
274 pcpu_size[i+1] -= size;
279 static inline unsigned int block_size(int val)
286 /* Created by linker magic */
287 extern char __per_cpu_start[], __per_cpu_end[];
289 static void *percpu_modalloc(unsigned long size, unsigned long align,
296 if (align > SMP_CACHE_BYTES) {
297 printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n",
298 name, align, SMP_CACHE_BYTES);
299 align = SMP_CACHE_BYTES;
302 ptr = __per_cpu_start;
303 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
304 /* Extra for alignment requirement. */
305 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
306 BUG_ON(i == 0 && extra != 0);
308 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
311 /* Transfer extra to previous block. */
312 if (pcpu_size[i-1] < 0)
313 pcpu_size[i-1] -= extra;
315 pcpu_size[i-1] += extra;
316 pcpu_size[i] -= extra;
319 /* Split block if warranted */
320 if (pcpu_size[i] - size > sizeof(unsigned long))
321 if (!split_block(i, size))
325 pcpu_size[i] = -pcpu_size[i];
329 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
334 static void percpu_modfree(void *freeme)
337 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
339 /* First entry is core kernel percpu data. */
340 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
342 pcpu_size[i] = -pcpu_size[i];
349 /* Merge with previous? */
350 if (pcpu_size[i-1] >= 0) {
351 pcpu_size[i-1] += pcpu_size[i];
353 memmove(&pcpu_size[i], &pcpu_size[i+1],
354 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
357 /* Merge with next? */
358 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
359 pcpu_size[i] += pcpu_size[i+1];
361 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
362 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
366 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
368 const char *secstrings)
370 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
373 static int percpu_modinit(void)
376 pcpu_num_allocated = 2;
377 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
379 /* Static in-kernel percpu data (used). */
380 pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
382 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
383 if (pcpu_size[1] < 0) {
384 printk(KERN_ERR "No per-cpu room for modules.\n");
390 __initcall(percpu_modinit);
391 #else /* ... !CONFIG_SMP */
392 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
397 static inline void percpu_modfree(void *pcpuptr)
401 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
403 const char *secstrings)
407 static inline void percpu_modcopy(void *pcpudst, const void *src,
410 /* pcpusec should be 0, and size of that section should be 0. */
413 #endif /* CONFIG_SMP */
415 #define MODINFO_ATTR(field) \
416 static void setup_modinfo_##field(struct module *mod, const char *s) \
418 mod->field = kstrdup(s, GFP_KERNEL); \
420 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
421 struct module *mod, char *buffer) \
423 return sprintf(buffer, "%s\n", mod->field); \
425 static int modinfo_##field##_exists(struct module *mod) \
427 return mod->field != NULL; \
429 static void free_modinfo_##field(struct module *mod) \
434 static struct module_attribute modinfo_##field = { \
435 .attr = { .name = __stringify(field), .mode = 0444, \
436 .owner = THIS_MODULE }, \
437 .show = show_modinfo_##field, \
438 .setup = setup_modinfo_##field, \
439 .test = modinfo_##field##_exists, \
440 .free = free_modinfo_##field, \
443 MODINFO_ATTR(version);
444 MODINFO_ATTR(srcversion);
446 #ifdef CONFIG_MODULE_UNLOAD
447 /* Init the unload section of the module. */
448 static void module_unload_init(struct module *mod)
452 INIT_LIST_HEAD(&mod->modules_which_use_me);
453 for (i = 0; i < NR_CPUS; i++)
454 local_set(&mod->ref[i].count, 0);
455 /* Hold reference count during initialization. */
456 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
457 /* Backwards compatibility macros put refcount during init. */
458 mod->waiter = current;
461 /* modules using other modules */
464 struct list_head list;
465 struct module *module_which_uses;
468 /* Does a already use b? */
469 static int already_uses(struct module *a, struct module *b)
471 struct module_use *use;
473 list_for_each_entry(use, &b->modules_which_use_me, list) {
474 if (use->module_which_uses == a) {
475 DEBUGP("%s uses %s!\n", a->name, b->name);
479 DEBUGP("%s does not use %s!\n", a->name, b->name);
483 /* Module a uses b */
484 static int use_module(struct module *a, struct module *b)
486 struct module_use *use;
487 if (b == NULL || already_uses(a, b)) return 1;
489 if (!strong_try_module_get(b))
492 DEBUGP("Allocating new usage for %s.\n", a->name);
493 use = kmalloc(sizeof(*use), GFP_ATOMIC);
495 printk("%s: out of memory loading\n", a->name);
500 use->module_which_uses = a;
501 list_add(&use->list, &b->modules_which_use_me);
505 /* Clear the unload stuff of the module. */
506 static void module_unload_free(struct module *mod)
510 list_for_each_entry(i, &modules, list) {
511 struct module_use *use;
513 list_for_each_entry(use, &i->modules_which_use_me, list) {
514 if (use->module_which_uses == mod) {
515 DEBUGP("%s unusing %s\n", mod->name, i->name);
517 list_del(&use->list);
519 /* There can be at most one match. */
526 #ifdef CONFIG_MODULE_FORCE_UNLOAD
527 static inline int try_force_unload(unsigned int flags)
529 int ret = (flags & O_TRUNC);
531 add_taint(TAINT_FORCED_RMMOD);
535 static inline int try_force_unload(unsigned int flags)
539 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
548 /* Whole machine is stopped with interrupts off when this runs. */
549 static int __try_stop_module(void *_sref)
551 struct stopref *sref = _sref;
553 /* If it's not unused, quit unless we are told to block. */
554 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
555 if (!(*sref->forced = try_force_unload(sref->flags)))
559 /* Mark it as dying. */
560 sref->mod->state = MODULE_STATE_GOING;
564 static int try_stop_module(struct module *mod, int flags, int *forced)
566 struct stopref sref = { mod, flags, forced };
568 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
571 unsigned int module_refcount(struct module *mod)
573 unsigned int i, total = 0;
575 for (i = 0; i < NR_CPUS; i++)
576 total += local_read(&mod->ref[i].count);
579 EXPORT_SYMBOL(module_refcount);
581 /* This exists whether we can unload or not */
582 static void free_module(struct module *mod);
584 static void wait_for_zero_refcount(struct module *mod)
586 /* Since we might sleep for some time, drop the semaphore first */
587 mutex_unlock(&module_mutex);
589 DEBUGP("Looking at refcount...\n");
590 set_current_state(TASK_UNINTERRUPTIBLE);
591 if (module_refcount(mod) == 0)
595 current->state = TASK_RUNNING;
596 mutex_lock(&module_mutex);
600 sys_delete_module(const char __user *name_user, unsigned int flags)
603 char name[MODULE_NAME_LEN];
606 if (!capable(CAP_SYS_MODULE))
609 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
611 name[MODULE_NAME_LEN-1] = '\0';
613 if (mutex_lock_interruptible(&module_mutex) != 0)
616 mod = find_module(name);
622 if (!list_empty(&mod->modules_which_use_me)) {
623 /* Other modules depend on us: get rid of them first. */
628 /* Doing init or already dying? */
629 if (mod->state != MODULE_STATE_LIVE) {
630 /* FIXME: if (force), slam module count and wake up
632 DEBUGP("%s already dying\n", mod->name);
637 /* If it has an init func, it must have an exit func to unload */
638 if ((mod->init != NULL && mod->exit == NULL)
640 forced = try_force_unload(flags);
642 /* This module can't be removed */
648 /* Set this up before setting mod->state */
649 mod->waiter = current;
651 /* Stop the machine so refcounts can't move and disable module. */
652 ret = try_stop_module(mod, flags, &forced);
656 /* Never wait if forced. */
657 if (!forced && module_refcount(mod) != 0)
658 wait_for_zero_refcount(mod);
660 /* Final destruction now noone is using it. */
661 if (mod->exit != NULL) {
662 mutex_unlock(&module_mutex);
664 mutex_lock(&module_mutex);
669 mutex_unlock(&module_mutex);
673 static void print_unload_info(struct seq_file *m, struct module *mod)
675 struct module_use *use;
676 int printed_something = 0;
678 seq_printf(m, " %u ", module_refcount(mod));
680 /* Always include a trailing , so userspace can differentiate
681 between this and the old multi-field proc format. */
682 list_for_each_entry(use, &mod->modules_which_use_me, list) {
683 printed_something = 1;
684 seq_printf(m, "%s,", use->module_which_uses->name);
688 printed_something = 1;
689 seq_printf(m, "[unsafe],");
692 if (mod->init != NULL && mod->exit == NULL) {
693 printed_something = 1;
694 seq_printf(m, "[permanent],");
697 if (!printed_something)
701 void __symbol_put(const char *symbol)
703 struct module *owner;
705 const unsigned long *crc;
707 spin_lock_irqsave(&modlist_lock, flags);
708 if (!__find_symbol(symbol, &owner, &crc, 1))
711 spin_unlock_irqrestore(&modlist_lock, flags);
713 EXPORT_SYMBOL(__symbol_put);
715 void symbol_put_addr(void *addr)
719 spin_lock_irqsave(&modlist_lock, flags);
720 if (!kernel_text_address((unsigned long)addr))
723 module_put(module_text_address((unsigned long)addr));
724 spin_unlock_irqrestore(&modlist_lock, flags);
726 EXPORT_SYMBOL_GPL(symbol_put_addr);
728 static ssize_t show_refcnt(struct module_attribute *mattr,
729 struct module *mod, char *buffer)
731 /* sysfs holds a reference */
732 return sprintf(buffer, "%u\n", module_refcount(mod)-1);
735 static struct module_attribute refcnt = {
736 .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE },
740 #else /* !CONFIG_MODULE_UNLOAD */
741 static void print_unload_info(struct seq_file *m, struct module *mod)
743 /* We don't know the usage count, or what modules are using. */
744 seq_printf(m, " - -");
747 static inline void module_unload_free(struct module *mod)
751 static inline int use_module(struct module *a, struct module *b)
753 return strong_try_module_get(b);
756 static inline void module_unload_init(struct module *mod)
759 #endif /* CONFIG_MODULE_UNLOAD */
761 static struct module_attribute *modinfo_attrs[] = {
764 #ifdef CONFIG_MODULE_UNLOAD
770 static const char vermagic[] = VERMAGIC_STRING;
772 #ifdef CONFIG_MODVERSIONS
773 static int check_version(Elf_Shdr *sechdrs,
774 unsigned int versindex,
777 const unsigned long *crc)
779 unsigned int i, num_versions;
780 struct modversion_info *versions;
782 /* Exporting module didn't supply crcs? OK, we're already tainted. */
786 versions = (void *) sechdrs[versindex].sh_addr;
787 num_versions = sechdrs[versindex].sh_size
788 / sizeof(struct modversion_info);
790 for (i = 0; i < num_versions; i++) {
791 if (strcmp(versions[i].name, symname) != 0)
794 if (versions[i].crc == *crc)
796 printk("%s: disagrees about version of symbol %s\n",
798 DEBUGP("Found checksum %lX vs module %lX\n",
799 *crc, versions[i].crc);
802 /* Not in module's version table. OK, but that taints the kernel. */
803 if (!(tainted & TAINT_FORCED_MODULE)) {
804 printk("%s: no version for \"%s\" found: kernel tainted.\n",
806 add_taint(TAINT_FORCED_MODULE);
811 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
812 unsigned int versindex,
815 const unsigned long *crc;
816 struct module *owner;
818 if (!__find_symbol("struct_module", &owner, &crc, 1))
820 return check_version(sechdrs, versindex, "struct_module", mod,
824 /* First part is kernel version, which we ignore. */
825 static inline int same_magic(const char *amagic, const char *bmagic)
827 amagic += strcspn(amagic, " ");
828 bmagic += strcspn(bmagic, " ");
829 return strcmp(amagic, bmagic) == 0;
832 static inline int check_version(Elf_Shdr *sechdrs,
833 unsigned int versindex,
836 const unsigned long *crc)
841 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
842 unsigned int versindex,
848 static inline int same_magic(const char *amagic, const char *bmagic)
850 return strcmp(amagic, bmagic) == 0;
852 #endif /* CONFIG_MODVERSIONS */
854 /* Resolve a symbol for this module. I.e. if we find one, record usage.
855 Must be holding module_mutex. */
856 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
857 unsigned int versindex,
861 struct module *owner;
863 const unsigned long *crc;
865 ret = __find_symbol(name, &owner, &crc, mod->license_gplok);
867 /* use_module can fail due to OOM, or module unloading */
868 if (!check_version(sechdrs, versindex, name, mod, crc) ||
869 !use_module(mod, owner))
877 * /sys/module/foo/sections stuff
878 * J. Corbet <corbet@lwn.net>
880 #ifdef CONFIG_KALLSYMS
881 static ssize_t module_sect_show(struct module_attribute *mattr,
882 struct module *mod, char *buf)
884 struct module_sect_attr *sattr =
885 container_of(mattr, struct module_sect_attr, mattr);
886 return sprintf(buf, "0x%lx\n", sattr->address);
889 static void add_sect_attrs(struct module *mod, unsigned int nsect,
890 char *secstrings, Elf_Shdr *sechdrs)
892 unsigned int nloaded = 0, i, size[2];
893 struct module_sect_attrs *sect_attrs;
894 struct module_sect_attr *sattr;
895 struct attribute **gattr;
897 /* Count loaded sections and allocate structures */
898 for (i = 0; i < nsect; i++)
899 if (sechdrs[i].sh_flags & SHF_ALLOC)
901 size[0] = ALIGN(sizeof(*sect_attrs)
902 + nloaded * sizeof(sect_attrs->attrs[0]),
903 sizeof(sect_attrs->grp.attrs[0]));
904 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
905 if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL)))
908 /* Setup section attributes. */
909 sect_attrs->grp.name = "sections";
910 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
912 sattr = §_attrs->attrs[0];
913 gattr = §_attrs->grp.attrs[0];
914 for (i = 0; i < nsect; i++) {
915 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
917 sattr->address = sechdrs[i].sh_addr;
918 strlcpy(sattr->name, secstrings + sechdrs[i].sh_name,
919 MODULE_SECT_NAME_LEN);
920 sattr->mattr.show = module_sect_show;
921 sattr->mattr.store = NULL;
922 sattr->mattr.attr.name = sattr->name;
923 sattr->mattr.attr.owner = mod;
924 sattr->mattr.attr.mode = S_IRUGO;
925 *(gattr++) = &(sattr++)->mattr.attr;
929 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
932 mod->sect_attrs = sect_attrs;
938 static void remove_sect_attrs(struct module *mod)
940 if (mod->sect_attrs) {
941 sysfs_remove_group(&mod->mkobj.kobj,
942 &mod->sect_attrs->grp);
943 /* We are positive that no one is using any sect attrs
944 * at this point. Deallocate immediately. */
945 kfree(mod->sect_attrs);
946 mod->sect_attrs = NULL;
952 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
953 char *sectstrings, Elf_Shdr *sechdrs)
957 static inline void remove_sect_attrs(struct module *mod)
960 #endif /* CONFIG_KALLSYMS */
962 static int module_add_modinfo_attrs(struct module *mod)
964 struct module_attribute *attr;
965 struct module_attribute *temp_attr;
969 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
970 (ARRAY_SIZE(modinfo_attrs) + 1)),
972 if (!mod->modinfo_attrs)
975 temp_attr = mod->modinfo_attrs;
976 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
978 (attr->test && attr->test(mod))) {
979 memcpy(temp_attr, attr, sizeof(*temp_attr));
980 temp_attr->attr.owner = mod;
981 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
988 static void module_remove_modinfo_attrs(struct module *mod)
990 struct module_attribute *attr;
993 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
994 /* pick a field to test for end of list */
995 if (!attr->attr.name)
997 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1001 kfree(mod->modinfo_attrs);
1004 static int mod_sysfs_setup(struct module *mod,
1005 struct kernel_param *kparam,
1006 unsigned int num_params)
1010 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1011 err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
1014 kobj_set_kset_s(&mod->mkobj, module_subsys);
1015 mod->mkobj.mod = mod;
1016 err = kobject_register(&mod->mkobj.kobj);
1020 err = module_param_sysfs_setup(mod, kparam, num_params);
1024 err = module_add_modinfo_attrs(mod);
1031 kobject_unregister(&mod->mkobj.kobj);
1036 static void mod_kobject_remove(struct module *mod)
1038 module_remove_modinfo_attrs(mod);
1039 module_param_sysfs_remove(mod);
1041 kobject_unregister(&mod->mkobj.kobj);
1045 * unlink the module with the whole machine is stopped with interrupts off
1046 * - this defends against kallsyms not taking locks
1048 static int __unlink_module(void *_mod)
1050 struct module *mod = _mod;
1051 list_del(&mod->list);
1055 /* Free a module, remove from lists, etc (must hold module mutex). */
1056 static void free_module(struct module *mod)
1058 /* Delete from various lists */
1059 stop_machine_run(__unlink_module, mod, NR_CPUS);
1060 remove_sect_attrs(mod);
1061 mod_kobject_remove(mod);
1063 /* Arch-specific cleanup. */
1064 module_arch_cleanup(mod);
1066 /* Module unload stuff */
1067 module_unload_free(mod);
1069 /* This may be NULL, but that's OK */
1070 module_free(mod, mod->module_init);
1073 percpu_modfree(mod->percpu);
1075 /* Finally, free the core (containing the module structure) */
1076 module_free(mod, mod->module_core);
1079 void *__symbol_get(const char *symbol)
1081 struct module *owner;
1082 unsigned long value, flags;
1083 const unsigned long *crc;
1085 spin_lock_irqsave(&modlist_lock, flags);
1086 value = __find_symbol(symbol, &owner, &crc, 1);
1087 if (value && !strong_try_module_get(owner))
1089 spin_unlock_irqrestore(&modlist_lock, flags);
1091 return (void *)value;
1093 EXPORT_SYMBOL_GPL(__symbol_get);
1096 * Ensure that an exported symbol [global namespace] does not already exist
1097 * in the Kernel or in some other modules exported symbol table.
1099 static int verify_export_symbols(struct module *mod)
1101 const char *name = NULL;
1102 unsigned long i, ret = 0;
1103 struct module *owner;
1104 const unsigned long *crc;
1106 for (i = 0; i < mod->num_syms; i++)
1107 if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
1108 name = mod->syms[i].name;
1113 for (i = 0; i < mod->num_gpl_syms; i++)
1114 if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
1115 name = mod->gpl_syms[i].name;
1122 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1123 mod->name, name, module_name(owner));
1128 /* Change all symbols so that sh_value encodes the pointer directly. */
1129 static int simplify_symbols(Elf_Shdr *sechdrs,
1130 unsigned int symindex,
1132 unsigned int versindex,
1133 unsigned int pcpuindex,
1136 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1137 unsigned long secbase;
1138 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1141 for (i = 1; i < n; i++) {
1142 switch (sym[i].st_shndx) {
1144 /* We compiled with -fno-common. These are not
1145 supposed to happen. */
1146 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1147 printk("%s: please compile with -fno-common\n",
1153 /* Don't need to do anything */
1154 DEBUGP("Absolute symbol: 0x%08lx\n",
1155 (long)sym[i].st_value);
1160 = resolve_symbol(sechdrs, versindex,
1161 strtab + sym[i].st_name, mod);
1163 /* Ok if resolved. */
1164 if (sym[i].st_value != 0)
1167 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1170 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1171 mod->name, strtab + sym[i].st_name);
1176 /* Divert to percpu allocation if a percpu var. */
1177 if (sym[i].st_shndx == pcpuindex)
1178 secbase = (unsigned long)mod->percpu;
1180 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1181 sym[i].st_value += secbase;
1189 /* Update size with this section: return offset. */
1190 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1194 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1195 *size = ret + sechdr->sh_size;
1199 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1200 might -- code, read-only data, read-write data, small data. Tally
1201 sizes, and place the offsets into sh_entsize fields: high bit means it
1203 static void layout_sections(struct module *mod,
1204 const Elf_Ehdr *hdr,
1206 const char *secstrings)
1208 static unsigned long const masks[][2] = {
1209 /* NOTE: all executable code must be the first section
1210 * in this array; otherwise modify the text_size
1211 * finder in the two loops below */
1212 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1213 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1214 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1215 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1219 for (i = 0; i < hdr->e_shnum; i++)
1220 sechdrs[i].sh_entsize = ~0UL;
1222 DEBUGP("Core section allocation order:\n");
1223 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1224 for (i = 0; i < hdr->e_shnum; ++i) {
1225 Elf_Shdr *s = &sechdrs[i];
1227 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1228 || (s->sh_flags & masks[m][1])
1229 || s->sh_entsize != ~0UL
1230 || strncmp(secstrings + s->sh_name,
1233 s->sh_entsize = get_offset(&mod->core_size, s);
1234 DEBUGP("\t%s\n", secstrings + s->sh_name);
1237 mod->core_text_size = mod->core_size;
1240 DEBUGP("Init section allocation order:\n");
1241 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1242 for (i = 0; i < hdr->e_shnum; ++i) {
1243 Elf_Shdr *s = &sechdrs[i];
1245 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1246 || (s->sh_flags & masks[m][1])
1247 || s->sh_entsize != ~0UL
1248 || strncmp(secstrings + s->sh_name,
1251 s->sh_entsize = (get_offset(&mod->init_size, s)
1252 | INIT_OFFSET_MASK);
1253 DEBUGP("\t%s\n", secstrings + s->sh_name);
1256 mod->init_text_size = mod->init_size;
1260 static inline int license_is_gpl_compatible(const char *license)
1262 return (strcmp(license, "GPL") == 0
1263 || strcmp(license, "GPL v2") == 0
1264 || strcmp(license, "GPL and additional rights") == 0
1265 || strcmp(license, "Dual BSD/GPL") == 0
1266 || strcmp(license, "Dual MPL/GPL") == 0);
1269 static void set_license(struct module *mod, const char *license)
1272 license = "unspecified";
1274 mod->license_gplok = license_is_gpl_compatible(license);
1275 if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) {
1276 printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
1277 mod->name, license);
1278 add_taint(TAINT_PROPRIETARY_MODULE);
1282 /* Parse tag=value strings from .modinfo section */
1283 static char *next_string(char *string, unsigned long *secsize)
1285 /* Skip non-zero chars */
1288 if ((*secsize)-- <= 1)
1292 /* Skip any zero padding. */
1293 while (!string[0]) {
1295 if ((*secsize)-- <= 1)
1301 static char *get_modinfo(Elf_Shdr *sechdrs,
1306 unsigned int taglen = strlen(tag);
1307 unsigned long size = sechdrs[info].sh_size;
1309 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1310 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1311 return p + taglen + 1;
1316 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1317 unsigned int infoindex)
1319 struct module_attribute *attr;
1322 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1325 get_modinfo(sechdrs,
1331 #ifdef CONFIG_KALLSYMS
1332 int is_exported(const char *name, const struct module *mod)
1334 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1337 if (lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1344 static char elf_type(const Elf_Sym *sym,
1346 const char *secstrings,
1349 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1350 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1355 if (sym->st_shndx == SHN_UNDEF)
1357 if (sym->st_shndx == SHN_ABS)
1359 if (sym->st_shndx >= SHN_LORESERVE)
1361 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1363 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1364 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1365 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1367 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1372 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1373 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1378 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1379 ".debug", strlen(".debug")) == 0)
1384 static void add_kallsyms(struct module *mod,
1386 unsigned int symindex,
1387 unsigned int strindex,
1388 const char *secstrings)
1392 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1393 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1394 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1396 /* Set types up while we still have access to sections. */
1397 for (i = 0; i < mod->num_symtab; i++)
1398 mod->symtab[i].st_info
1399 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1402 static inline void add_kallsyms(struct module *mod,
1404 unsigned int symindex,
1405 unsigned int strindex,
1406 const char *secstrings)
1409 #endif /* CONFIG_KALLSYMS */
1411 /* Allocate and load the module: note that size of section 0 is always
1412 zero, and we rely on this for optional sections. */
1413 static struct module *load_module(void __user *umod,
1415 const char __user *uargs)
1419 char *secstrings, *args, *modmagic, *strtab = NULL;
1420 unsigned int i, symindex = 0, strindex = 0, setupindex, exindex,
1421 exportindex, modindex, obsparmindex, infoindex, gplindex,
1422 crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex,
1426 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1427 struct exception_table_entry *extable;
1428 mm_segment_t old_fs;
1430 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1432 if (len < sizeof(*hdr))
1433 return ERR_PTR(-ENOEXEC);
1435 /* Suck in entire file: we'll want most of it. */
1436 /* vmalloc barfs on "unusual" numbers. Check here */
1437 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1438 return ERR_PTR(-ENOMEM);
1439 if (copy_from_user(hdr, umod, len) != 0) {
1444 /* Sanity checks against insmoding binaries or wrong arch,
1445 weird elf version */
1446 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1447 || hdr->e_type != ET_REL
1448 || !elf_check_arch(hdr)
1449 || hdr->e_shentsize != sizeof(*sechdrs)) {
1454 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1457 /* Convenience variables */
1458 sechdrs = (void *)hdr + hdr->e_shoff;
1459 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1460 sechdrs[0].sh_addr = 0;
1462 for (i = 1; i < hdr->e_shnum; i++) {
1463 if (sechdrs[i].sh_type != SHT_NOBITS
1464 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1467 /* Mark all sections sh_addr with their address in the
1469 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1471 /* Internal symbols and strings. */
1472 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1474 strindex = sechdrs[i].sh_link;
1475 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1477 #ifndef CONFIG_MODULE_UNLOAD
1478 /* Don't load .exit sections */
1479 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1480 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1484 modindex = find_sec(hdr, sechdrs, secstrings,
1485 ".gnu.linkonce.this_module");
1487 printk(KERN_WARNING "No module found in object\n");
1491 mod = (void *)sechdrs[modindex].sh_addr;
1493 if (symindex == 0) {
1494 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1500 /* Optional sections */
1501 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1502 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1503 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1504 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1505 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1506 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1507 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1508 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1509 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1510 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1511 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1512 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1514 /* Don't keep modinfo section */
1515 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1516 #ifdef CONFIG_KALLSYMS
1517 /* Keep symbol and string tables for decoding later. */
1518 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1519 sechdrs[strindex].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 /* Get rid of temporary copy */
1756 module_arch_cleanup(mod);
1758 module_unload_free(mod);
1759 module_free(mod, mod->module_init);
1761 module_free(mod, mod->module_core);
1764 percpu_modfree(percpu);
1769 return ERR_PTR(err);
1772 printk(KERN_ERR "Module len %lu truncated\n", len);
1778 * link the module with the whole machine is stopped with interrupts off
1779 * - this defends against kallsyms not taking locks
1781 static int __link_module(void *_mod)
1783 struct module *mod = _mod;
1784 list_add(&mod->list, &modules);
1788 /* This is where the real work happens */
1790 sys_init_module(void __user *umod,
1792 const char __user *uargs)
1797 /* Must have permission */
1798 if (!capable(CAP_SYS_MODULE))
1801 /* Only one module load at a time, please */
1802 if (mutex_lock_interruptible(&module_mutex) != 0)
1805 /* Do all the hard work */
1806 mod = load_module(umod, len, uargs);
1808 mutex_unlock(&module_mutex);
1809 return PTR_ERR(mod);
1812 /* Now sew it into the lists. They won't access us, since
1813 strong_try_module_get() will fail. */
1814 stop_machine_run(__link_module, mod, NR_CPUS);
1816 /* Drop lock so they can recurse */
1817 mutex_unlock(&module_mutex);
1819 mutex_lock(¬ify_mutex);
1820 notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod);
1821 mutex_unlock(¬ify_mutex);
1823 /* Start the module */
1824 if (mod->init != NULL)
1827 /* Init routine failed: abort. Try to protect us from
1828 buggy refcounters. */
1829 mod->state = MODULE_STATE_GOING;
1830 synchronize_sched();
1832 printk(KERN_ERR "%s: module is now stuck!\n",
1836 mutex_lock(&module_mutex);
1838 mutex_unlock(&module_mutex);
1843 /* Now it's a first class citizen! */
1844 mutex_lock(&module_mutex);
1845 mod->state = MODULE_STATE_LIVE;
1846 /* Drop initial reference. */
1848 module_free(mod, mod->module_init);
1849 mod->module_init = NULL;
1851 mod->init_text_size = 0;
1852 mutex_unlock(&module_mutex);
1857 static inline int within(unsigned long addr, void *start, unsigned long size)
1859 return ((void *)addr >= start && (void *)addr < start + size);
1862 #ifdef CONFIG_KALLSYMS
1864 * This ignores the intensely annoying "mapping symbols" found
1865 * in ARM ELF files: $a, $t and $d.
1867 static inline int is_arm_mapping_symbol(const char *str)
1869 return str[0] == '$' && strchr("atd", str[1])
1870 && (str[2] == '\0' || str[2] == '.');
1873 static const char *get_ksymbol(struct module *mod,
1875 unsigned long *size,
1876 unsigned long *offset)
1878 unsigned int i, best = 0;
1879 unsigned long nextval;
1881 /* At worse, next value is at end of module */
1882 if (within(addr, mod->module_init, mod->init_size))
1883 nextval = (unsigned long)mod->module_init+mod->init_text_size;
1885 nextval = (unsigned long)mod->module_core+mod->core_text_size;
1887 /* Scan for closest preceeding symbol, and next symbol. (ELF
1888 starts real symbols at 1). */
1889 for (i = 1; i < mod->num_symtab; i++) {
1890 if (mod->symtab[i].st_shndx == SHN_UNDEF)
1893 /* We ignore unnamed symbols: they're uninformative
1894 * and inserted at a whim. */
1895 if (mod->symtab[i].st_value <= addr
1896 && mod->symtab[i].st_value > mod->symtab[best].st_value
1897 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
1898 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
1900 if (mod->symtab[i].st_value > addr
1901 && mod->symtab[i].st_value < nextval
1902 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
1903 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
1904 nextval = mod->symtab[i].st_value;
1910 *size = nextval - mod->symtab[best].st_value;
1911 *offset = addr - mod->symtab[best].st_value;
1912 return mod->strtab + mod->symtab[best].st_name;
1915 /* For kallsyms to ask for address resolution. NULL means not found.
1916 We don't lock, as this is used for oops resolution and races are a
1918 const char *module_address_lookup(unsigned long addr,
1919 unsigned long *size,
1920 unsigned long *offset,
1925 list_for_each_entry(mod, &modules, list) {
1926 if (within(addr, mod->module_init, mod->init_size)
1927 || within(addr, mod->module_core, mod->core_size)) {
1928 *modname = mod->name;
1929 return get_ksymbol(mod, addr, size, offset);
1935 struct module *module_get_kallsym(unsigned int symnum,
1936 unsigned long *value,
1942 mutex_lock(&module_mutex);
1943 list_for_each_entry(mod, &modules, list) {
1944 if (symnum < mod->num_symtab) {
1945 *value = mod->symtab[symnum].st_value;
1946 *type = mod->symtab[symnum].st_info;
1948 mod->strtab + mod->symtab[symnum].st_name,
1950 mutex_unlock(&module_mutex);
1953 symnum -= mod->num_symtab;
1955 mutex_unlock(&module_mutex);
1959 static unsigned long mod_find_symname(struct module *mod, const char *name)
1963 for (i = 0; i < mod->num_symtab; i++)
1964 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
1965 mod->symtab[i].st_info != 'U')
1966 return mod->symtab[i].st_value;
1970 /* Look for this name: can be of form module:name. */
1971 unsigned long module_kallsyms_lookup_name(const char *name)
1975 unsigned long ret = 0;
1977 /* Don't lock: we're in enough trouble already. */
1978 if ((colon = strchr(name, ':')) != NULL) {
1980 if ((mod = find_module(name)) != NULL)
1981 ret = mod_find_symname(mod, colon+1);
1984 list_for_each_entry(mod, &modules, list)
1985 if ((ret = mod_find_symname(mod, name)) != 0)
1990 #endif /* CONFIG_KALLSYMS */
1992 /* Called by the /proc file system to return a list of modules. */
1993 static void *m_start(struct seq_file *m, loff_t *pos)
1995 struct list_head *i;
1998 mutex_lock(&module_mutex);
1999 list_for_each(i, &modules) {
2008 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2010 struct list_head *i = p;
2012 if (i->next == &modules)
2017 static void m_stop(struct seq_file *m, void *p)
2019 mutex_unlock(&module_mutex);
2022 static int m_show(struct seq_file *m, void *p)
2024 struct module *mod = list_entry(p, struct module, list);
2025 seq_printf(m, "%s %lu",
2026 mod->name, mod->init_size + mod->core_size);
2027 print_unload_info(m, mod);
2029 /* Informative for users. */
2030 seq_printf(m, " %s",
2031 mod->state == MODULE_STATE_GOING ? "Unloading":
2032 mod->state == MODULE_STATE_COMING ? "Loading":
2034 /* Used by oprofile and other similar tools. */
2035 seq_printf(m, " 0x%p", mod->module_core);
2037 seq_printf(m, "\n");
2041 /* Format: modulename size refcount deps address
2043 Where refcount is a number or -, and deps is a comma-separated list
2046 struct seq_operations modules_op = {
2053 /* Given an address, look for it in the module exception tables. */
2054 const struct exception_table_entry *search_module_extables(unsigned long addr)
2056 unsigned long flags;
2057 const struct exception_table_entry *e = NULL;
2060 spin_lock_irqsave(&modlist_lock, flags);
2061 list_for_each_entry(mod, &modules, list) {
2062 if (mod->num_exentries == 0)
2065 e = search_extable(mod->extable,
2066 mod->extable + mod->num_exentries - 1,
2071 spin_unlock_irqrestore(&modlist_lock, flags);
2073 /* Now, if we found one, we are running inside it now, hence
2074 we cannot unload the module, hence no refcnt needed. */
2078 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2079 struct module *__module_text_address(unsigned long addr)
2083 list_for_each_entry(mod, &modules, list)
2084 if (within(addr, mod->module_init, mod->init_text_size)
2085 || within(addr, mod->module_core, mod->core_text_size))
2090 struct module *module_text_address(unsigned long addr)
2093 unsigned long flags;
2095 spin_lock_irqsave(&modlist_lock, flags);
2096 mod = __module_text_address(addr);
2097 spin_unlock_irqrestore(&modlist_lock, flags);
2102 /* Don't grab lock, we're oopsing. */
2103 void print_modules(void)
2107 printk("Modules linked in:");
2108 list_for_each_entry(mod, &modules, list)
2109 printk(" %s", mod->name);
2113 void module_add_driver(struct module *mod, struct device_driver *drv)
2118 /* Don't check return code; this call is idempotent */
2119 sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module");
2121 EXPORT_SYMBOL(module_add_driver);
2123 void module_remove_driver(struct device_driver *drv)
2127 sysfs_remove_link(&drv->kobj, "module");
2129 EXPORT_SYMBOL(module_remove_driver);
2131 #ifdef CONFIG_MODVERSIONS
2132 /* Generate the signature for struct module here, too, for modversions. */
2133 void struct_module(struct module *mod) { return; }
2134 EXPORT_SYMBOL(struct_module);