2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/init.h>
22 #include <linux/kallsyms.h>
23 #include <linux/sysfs.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/elf.h>
28 #include <linux/seq_file.h>
29 #include <linux/syscalls.h>
30 #include <linux/fcntl.h>
31 #include <linux/rcupdate.h>
32 #include <linux/capability.h>
33 #include <linux/cpu.h>
34 #include <linux/moduleparam.h>
35 #include <linux/errno.h>
36 #include <linux/err.h>
37 #include <linux/vermagic.h>
38 #include <linux/notifier.h>
39 #include <linux/sched.h>
40 #include <linux/stop_machine.h>
41 #include <linux/device.h>
42 #include <linux/string.h>
43 #include <linux/mutex.h>
44 #include <linux/unwind.h>
45 #include <asm/uaccess.h>
46 #include <asm/semaphore.h>
47 #include <asm/cacheflush.h>
48 #include <linux/license.h>
53 #define DEBUGP(fmt , a...)
56 #ifndef ARCH_SHF_SMALL
57 #define ARCH_SHF_SMALL 0
60 /* If this is set, the section belongs in the init part of the module */
61 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
63 /* List of modules, protected by module_mutex or preempt_disable
64 * (add/delete uses stop_machine). */
65 static DEFINE_MUTEX(module_mutex);
66 static LIST_HEAD(modules);
68 /* Waiting for a module to finish initializing? */
69 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
71 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
73 int register_module_notifier(struct notifier_block * nb)
75 return blocking_notifier_chain_register(&module_notify_list, nb);
77 EXPORT_SYMBOL(register_module_notifier);
79 int unregister_module_notifier(struct notifier_block * nb)
81 return blocking_notifier_chain_unregister(&module_notify_list, nb);
83 EXPORT_SYMBOL(unregister_module_notifier);
85 /* We require a truly strong try_module_get(): 0 means failure due to
86 ongoing or failed initialization etc. */
87 static inline int strong_try_module_get(struct module *mod)
89 if (mod && mod->state == MODULE_STATE_COMING)
91 if (try_module_get(mod))
97 static inline void add_taint_module(struct module *mod, unsigned flag)
104 * A thread that wants to hold a reference to a module only while it
105 * is running can call this to safely exit. nfsd and lockd use this.
107 void __module_put_and_exit(struct module *mod, long code)
112 EXPORT_SYMBOL(__module_put_and_exit);
114 /* Find a module section: 0 means not found. */
115 static unsigned int find_sec(Elf_Ehdr *hdr,
117 const char *secstrings,
122 for (i = 1; i < hdr->e_shnum; i++)
123 /* Alloc bit cleared means "ignore it." */
124 if ((sechdrs[i].sh_flags & SHF_ALLOC)
125 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
130 /* Provided by the linker */
131 extern const struct kernel_symbol __start___ksymtab[];
132 extern const struct kernel_symbol __stop___ksymtab[];
133 extern const struct kernel_symbol __start___ksymtab_gpl[];
134 extern const struct kernel_symbol __stop___ksymtab_gpl[];
135 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
136 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
137 extern const struct kernel_symbol __start___ksymtab_unused[];
138 extern const struct kernel_symbol __stop___ksymtab_unused[];
139 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
140 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
141 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
142 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
143 extern const unsigned long __start___kcrctab[];
144 extern const unsigned long __start___kcrctab_gpl[];
145 extern const unsigned long __start___kcrctab_gpl_future[];
146 extern const unsigned long __start___kcrctab_unused[];
147 extern const unsigned long __start___kcrctab_unused_gpl[];
149 #ifndef CONFIG_MODVERSIONS
150 #define symversion(base, idx) NULL
152 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
155 /* lookup symbol in given range of kernel_symbols */
156 static const struct kernel_symbol *lookup_symbol(const char *name,
157 const struct kernel_symbol *start,
158 const struct kernel_symbol *stop)
160 const struct kernel_symbol *ks = start;
161 for (; ks < stop; ks++)
162 if (strcmp(ks->name, name) == 0)
167 static void printk_unused_warning(const char *name)
169 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
170 "however this module is using it.\n", name);
171 printk(KERN_WARNING "This symbol will go away in the future.\n");
172 printk(KERN_WARNING "Please evalute if this is the right api to use, "
173 "and if it really is, submit a report the linux kernel "
174 "mailinglist together with submitting your code for "
178 /* Find a symbol, return value, crc and module which owns it */
179 static unsigned long __find_symbol(const char *name,
180 struct module **owner,
181 const unsigned long **crc,
185 const struct kernel_symbol *ks;
187 /* Core kernel first. */
189 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
191 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
195 ks = lookup_symbol(name, __start___ksymtab_gpl,
196 __stop___ksymtab_gpl);
198 *crc = symversion(__start___kcrctab_gpl,
199 (ks - __start___ksymtab_gpl));
203 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
204 __stop___ksymtab_gpl_future);
207 printk(KERN_WARNING "Symbol %s is being used "
208 "by a non-GPL module, which will not "
209 "be allowed in the future\n", name);
210 printk(KERN_WARNING "Please see the file "
211 "Documentation/feature-removal-schedule.txt "
212 "in the kernel source tree for more "
215 *crc = symversion(__start___kcrctab_gpl_future,
216 (ks - __start___ksymtab_gpl_future));
220 ks = lookup_symbol(name, __start___ksymtab_unused,
221 __stop___ksymtab_unused);
223 printk_unused_warning(name);
224 *crc = symversion(__start___kcrctab_unused,
225 (ks - __start___ksymtab_unused));
230 ks = lookup_symbol(name, __start___ksymtab_unused_gpl,
231 __stop___ksymtab_unused_gpl);
233 printk_unused_warning(name);
234 *crc = symversion(__start___kcrctab_unused_gpl,
235 (ks - __start___ksymtab_unused_gpl));
239 /* Now try modules. */
240 list_for_each_entry(mod, &modules, list) {
242 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
244 *crc = symversion(mod->crcs, (ks - mod->syms));
249 ks = lookup_symbol(name, mod->gpl_syms,
250 mod->gpl_syms + mod->num_gpl_syms);
252 *crc = symversion(mod->gpl_crcs,
253 (ks - mod->gpl_syms));
257 ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms);
259 printk_unused_warning(name);
260 *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms));
265 ks = lookup_symbol(name, mod->unused_gpl_syms,
266 mod->unused_gpl_syms + mod->num_unused_gpl_syms);
268 printk_unused_warning(name);
269 *crc = symversion(mod->unused_gpl_crcs,
270 (ks - mod->unused_gpl_syms));
274 ks = lookup_symbol(name, mod->gpl_future_syms,
275 (mod->gpl_future_syms +
276 mod->num_gpl_future_syms));
279 printk(KERN_WARNING "Symbol %s is being used "
280 "by a non-GPL module, which will not "
281 "be allowed in the future\n", name);
282 printk(KERN_WARNING "Please see the file "
283 "Documentation/feature-removal-schedule.txt "
284 "in the kernel source tree for more "
287 *crc = symversion(mod->gpl_future_crcs,
288 (ks - mod->gpl_future_syms));
292 DEBUGP("Failed to find symbol %s\n", name);
296 /* Search for module by name: must hold module_mutex. */
297 static struct module *find_module(const char *name)
301 list_for_each_entry(mod, &modules, list) {
302 if (strcmp(mod->name, name) == 0)
309 /* Number of blocks used and allocated. */
310 static unsigned int pcpu_num_used, pcpu_num_allocated;
311 /* Size of each block. -ve means used. */
312 static int *pcpu_size;
314 static int split_block(unsigned int i, unsigned short size)
316 /* Reallocation required? */
317 if (pcpu_num_used + 1 > pcpu_num_allocated) {
320 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
325 pcpu_num_allocated *= 2;
329 /* Insert a new subblock */
330 memmove(&pcpu_size[i+1], &pcpu_size[i],
331 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
334 pcpu_size[i+1] -= size;
339 static inline unsigned int block_size(int val)
346 /* Created by linker magic */
347 extern char __per_cpu_start[], __per_cpu_end[];
349 static void *percpu_modalloc(unsigned long size, unsigned long align,
356 if (align > PAGE_SIZE) {
357 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
358 name, align, PAGE_SIZE);
362 ptr = __per_cpu_start;
363 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
364 /* Extra for alignment requirement. */
365 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
366 BUG_ON(i == 0 && extra != 0);
368 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
371 /* Transfer extra to previous block. */
372 if (pcpu_size[i-1] < 0)
373 pcpu_size[i-1] -= extra;
375 pcpu_size[i-1] += extra;
376 pcpu_size[i] -= extra;
379 /* Split block if warranted */
380 if (pcpu_size[i] - size > sizeof(unsigned long))
381 if (!split_block(i, size))
385 pcpu_size[i] = -pcpu_size[i];
389 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
394 static void percpu_modfree(void *freeme)
397 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
399 /* First entry is core kernel percpu data. */
400 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
402 pcpu_size[i] = -pcpu_size[i];
409 /* Merge with previous? */
410 if (pcpu_size[i-1] >= 0) {
411 pcpu_size[i-1] += pcpu_size[i];
413 memmove(&pcpu_size[i], &pcpu_size[i+1],
414 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
417 /* Merge with next? */
418 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
419 pcpu_size[i] += pcpu_size[i+1];
421 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
422 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
426 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
428 const char *secstrings)
430 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
433 static int percpu_modinit(void)
436 pcpu_num_allocated = 2;
437 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
439 /* Static in-kernel percpu data (used). */
440 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
442 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
443 if (pcpu_size[1] < 0) {
444 printk(KERN_ERR "No per-cpu room for modules.\n");
450 __initcall(percpu_modinit);
451 #else /* ... !CONFIG_SMP */
452 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
457 static inline void percpu_modfree(void *pcpuptr)
461 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
463 const char *secstrings)
467 static inline void percpu_modcopy(void *pcpudst, const void *src,
470 /* pcpusec should be 0, and size of that section should be 0. */
473 #endif /* CONFIG_SMP */
475 #define MODINFO_ATTR(field) \
476 static void setup_modinfo_##field(struct module *mod, const char *s) \
478 mod->field = kstrdup(s, GFP_KERNEL); \
480 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
481 struct module *mod, char *buffer) \
483 return sprintf(buffer, "%s\n", mod->field); \
485 static int modinfo_##field##_exists(struct module *mod) \
487 return mod->field != NULL; \
489 static void free_modinfo_##field(struct module *mod) \
494 static struct module_attribute modinfo_##field = { \
495 .attr = { .name = __stringify(field), .mode = 0444 }, \
496 .show = show_modinfo_##field, \
497 .setup = setup_modinfo_##field, \
498 .test = modinfo_##field##_exists, \
499 .free = free_modinfo_##field, \
502 MODINFO_ATTR(version);
503 MODINFO_ATTR(srcversion);
505 static char last_unloaded_module[MODULE_NAME_LEN+1];
507 #ifdef CONFIG_MODULE_UNLOAD
508 /* Init the unload section of the module. */
509 static void module_unload_init(struct module *mod)
513 INIT_LIST_HEAD(&mod->modules_which_use_me);
514 for (i = 0; i < NR_CPUS; i++)
515 local_set(&mod->ref[i].count, 0);
516 /* Hold reference count during initialization. */
517 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
518 /* Backwards compatibility macros put refcount during init. */
519 mod->waiter = current;
522 /* modules using other modules */
525 struct list_head list;
526 struct module *module_which_uses;
529 /* Does a already use b? */
530 static int already_uses(struct module *a, struct module *b)
532 struct module_use *use;
534 list_for_each_entry(use, &b->modules_which_use_me, list) {
535 if (use->module_which_uses == a) {
536 DEBUGP("%s uses %s!\n", a->name, b->name);
540 DEBUGP("%s does not use %s!\n", a->name, b->name);
544 /* Module a uses b */
545 static int use_module(struct module *a, struct module *b)
547 struct module_use *use;
550 if (b == NULL || already_uses(a, b)) return 1;
552 /* If we're interrupted or time out, we fail. */
553 if (wait_event_interruptible_timeout(
554 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
556 printk("%s: gave up waiting for init of module %s.\n",
561 /* If strong_try_module_get() returned a different error, we fail. */
565 DEBUGP("Allocating new usage for %s.\n", a->name);
566 use = kmalloc(sizeof(*use), GFP_ATOMIC);
568 printk("%s: out of memory loading\n", a->name);
573 use->module_which_uses = a;
574 list_add(&use->list, &b->modules_which_use_me);
575 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
579 /* Clear the unload stuff of the module. */
580 static void module_unload_free(struct module *mod)
584 list_for_each_entry(i, &modules, list) {
585 struct module_use *use;
587 list_for_each_entry(use, &i->modules_which_use_me, list) {
588 if (use->module_which_uses == mod) {
589 DEBUGP("%s unusing %s\n", mod->name, i->name);
591 list_del(&use->list);
593 sysfs_remove_link(i->holders_dir, mod->name);
594 /* There can be at most one match. */
601 #ifdef CONFIG_MODULE_FORCE_UNLOAD
602 static inline int try_force_unload(unsigned int flags)
604 int ret = (flags & O_TRUNC);
606 add_taint(TAINT_FORCED_RMMOD);
610 static inline int try_force_unload(unsigned int flags)
614 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
623 /* Whole machine is stopped with interrupts off when this runs. */
624 static int __try_stop_module(void *_sref)
626 struct stopref *sref = _sref;
628 /* If it's not unused, quit unless we are told to block. */
629 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
630 if (!(*sref->forced = try_force_unload(sref->flags)))
634 /* Mark it as dying. */
635 sref->mod->state = MODULE_STATE_GOING;
639 static int try_stop_module(struct module *mod, int flags, int *forced)
641 struct stopref sref = { mod, flags, forced };
643 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
646 unsigned int module_refcount(struct module *mod)
648 unsigned int i, total = 0;
650 for (i = 0; i < NR_CPUS; i++)
651 total += local_read(&mod->ref[i].count);
654 EXPORT_SYMBOL(module_refcount);
656 /* This exists whether we can unload or not */
657 static void free_module(struct module *mod);
659 static void wait_for_zero_refcount(struct module *mod)
661 /* Since we might sleep for some time, drop the semaphore first */
662 mutex_unlock(&module_mutex);
664 DEBUGP("Looking at refcount...\n");
665 set_current_state(TASK_UNINTERRUPTIBLE);
666 if (module_refcount(mod) == 0)
670 current->state = TASK_RUNNING;
671 mutex_lock(&module_mutex);
675 sys_delete_module(const char __user *name_user, unsigned int flags)
678 char name[MODULE_NAME_LEN];
681 if (!capable(CAP_SYS_MODULE))
684 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
686 name[MODULE_NAME_LEN-1] = '\0';
688 if (mutex_lock_interruptible(&module_mutex) != 0)
691 mod = find_module(name);
697 if (!list_empty(&mod->modules_which_use_me)) {
698 /* Other modules depend on us: get rid of them first. */
703 /* Doing init or already dying? */
704 if (mod->state != MODULE_STATE_LIVE) {
705 /* FIXME: if (force), slam module count and wake up
707 DEBUGP("%s already dying\n", mod->name);
712 /* If it has an init func, it must have an exit func to unload */
713 if (mod->init && !mod->exit) {
714 forced = try_force_unload(flags);
716 /* This module can't be removed */
722 /* Set this up before setting mod->state */
723 mod->waiter = current;
725 /* Stop the machine so refcounts can't move and disable module. */
726 ret = try_stop_module(mod, flags, &forced);
730 /* Never wait if forced. */
731 if (!forced && module_refcount(mod) != 0)
732 wait_for_zero_refcount(mod);
734 /* Final destruction now noone is using it. */
735 if (mod->exit != NULL) {
736 mutex_unlock(&module_mutex);
738 mutex_lock(&module_mutex);
740 /* Store the name of the last unloaded module for diagnostic purposes */
741 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
745 mutex_unlock(&module_mutex);
749 static void print_unload_info(struct seq_file *m, struct module *mod)
751 struct module_use *use;
752 int printed_something = 0;
754 seq_printf(m, " %u ", module_refcount(mod));
756 /* Always include a trailing , so userspace can differentiate
757 between this and the old multi-field proc format. */
758 list_for_each_entry(use, &mod->modules_which_use_me, list) {
759 printed_something = 1;
760 seq_printf(m, "%s,", use->module_which_uses->name);
763 if (mod->init != NULL && mod->exit == NULL) {
764 printed_something = 1;
765 seq_printf(m, "[permanent],");
768 if (!printed_something)
772 void __symbol_put(const char *symbol)
774 struct module *owner;
775 const unsigned long *crc;
778 if (!__find_symbol(symbol, &owner, &crc, 1))
783 EXPORT_SYMBOL(__symbol_put);
785 void symbol_put_addr(void *addr)
787 struct module *modaddr;
789 if (core_kernel_text((unsigned long)addr))
792 if (!(modaddr = module_text_address((unsigned long)addr)))
796 EXPORT_SYMBOL_GPL(symbol_put_addr);
798 static ssize_t show_refcnt(struct module_attribute *mattr,
799 struct module *mod, char *buffer)
801 return sprintf(buffer, "%u\n", module_refcount(mod));
804 static struct module_attribute refcnt = {
805 .attr = { .name = "refcnt", .mode = 0444 },
809 void module_put(struct module *module)
812 unsigned int cpu = get_cpu();
813 local_dec(&module->ref[cpu].count);
814 /* Maybe they're waiting for us to drop reference? */
815 if (unlikely(!module_is_live(module)))
816 wake_up_process(module->waiter);
820 EXPORT_SYMBOL(module_put);
822 #else /* !CONFIG_MODULE_UNLOAD */
823 static void print_unload_info(struct seq_file *m, struct module *mod)
825 /* We don't know the usage count, or what modules are using. */
826 seq_printf(m, " - -");
829 static inline void module_unload_free(struct module *mod)
833 static inline int use_module(struct module *a, struct module *b)
835 return strong_try_module_get(b) == 0;
838 static inline void module_unload_init(struct module *mod)
841 #endif /* CONFIG_MODULE_UNLOAD */
843 static ssize_t show_initstate(struct module_attribute *mattr,
844 struct module *mod, char *buffer)
846 const char *state = "unknown";
848 switch (mod->state) {
849 case MODULE_STATE_LIVE:
852 case MODULE_STATE_COMING:
855 case MODULE_STATE_GOING:
859 return sprintf(buffer, "%s\n", state);
862 static struct module_attribute initstate = {
863 .attr = { .name = "initstate", .mode = 0444 },
864 .show = show_initstate,
867 static struct module_attribute *modinfo_attrs[] = {
871 #ifdef CONFIG_MODULE_UNLOAD
877 static const char vermagic[] = VERMAGIC_STRING;
879 #ifdef CONFIG_MODVERSIONS
880 static int check_version(Elf_Shdr *sechdrs,
881 unsigned int versindex,
884 const unsigned long *crc)
886 unsigned int i, num_versions;
887 struct modversion_info *versions;
889 /* Exporting module didn't supply crcs? OK, we're already tainted. */
893 versions = (void *) sechdrs[versindex].sh_addr;
894 num_versions = sechdrs[versindex].sh_size
895 / sizeof(struct modversion_info);
897 for (i = 0; i < num_versions; i++) {
898 if (strcmp(versions[i].name, symname) != 0)
901 if (versions[i].crc == *crc)
903 printk("%s: disagrees about version of symbol %s\n",
905 DEBUGP("Found checksum %lX vs module %lX\n",
906 *crc, versions[i].crc);
909 /* Not in module's version table. OK, but that taints the kernel. */
910 if (!(tainted & TAINT_FORCED_MODULE))
911 printk("%s: no version for \"%s\" found: kernel tainted.\n",
913 add_taint_module(mod, TAINT_FORCED_MODULE);
917 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
918 unsigned int versindex,
921 const unsigned long *crc;
922 struct module *owner;
924 if (!__find_symbol("struct_module", &owner, &crc, 1))
926 return check_version(sechdrs, versindex, "struct_module", mod,
930 /* First part is kernel version, which we ignore. */
931 static inline int same_magic(const char *amagic, const char *bmagic)
933 amagic += strcspn(amagic, " ");
934 bmagic += strcspn(bmagic, " ");
935 return strcmp(amagic, bmagic) == 0;
938 static inline int check_version(Elf_Shdr *sechdrs,
939 unsigned int versindex,
942 const unsigned long *crc)
947 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
948 unsigned int versindex,
954 static inline int same_magic(const char *amagic, const char *bmagic)
956 return strcmp(amagic, bmagic) == 0;
958 #endif /* CONFIG_MODVERSIONS */
960 /* Resolve a symbol for this module. I.e. if we find one, record usage.
961 Must be holding module_mutex. */
962 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
963 unsigned int versindex,
967 struct module *owner;
969 const unsigned long *crc;
971 ret = __find_symbol(name, &owner, &crc,
972 !(mod->taints & TAINT_PROPRIETARY_MODULE));
974 /* use_module can fail due to OOM,
975 or module initialization or unloading */
976 if (!check_version(sechdrs, versindex, name, mod, crc) ||
977 !use_module(mod, owner))
985 * /sys/module/foo/sections stuff
986 * J. Corbet <corbet@lwn.net>
988 #ifdef CONFIG_KALLSYMS
989 static ssize_t module_sect_show(struct module_attribute *mattr,
990 struct module *mod, char *buf)
992 struct module_sect_attr *sattr =
993 container_of(mattr, struct module_sect_attr, mattr);
994 return sprintf(buf, "0x%lx\n", sattr->address);
997 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1001 for (section = 0; section < sect_attrs->nsections; section++)
1002 kfree(sect_attrs->attrs[section].name);
1006 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1007 char *secstrings, Elf_Shdr *sechdrs)
1009 unsigned int nloaded = 0, i, size[2];
1010 struct module_sect_attrs *sect_attrs;
1011 struct module_sect_attr *sattr;
1012 struct attribute **gattr;
1014 /* Count loaded sections and allocate structures */
1015 for (i = 0; i < nsect; i++)
1016 if (sechdrs[i].sh_flags & SHF_ALLOC)
1018 size[0] = ALIGN(sizeof(*sect_attrs)
1019 + nloaded * sizeof(sect_attrs->attrs[0]),
1020 sizeof(sect_attrs->grp.attrs[0]));
1021 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1022 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1023 if (sect_attrs == NULL)
1026 /* Setup section attributes. */
1027 sect_attrs->grp.name = "sections";
1028 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1030 sect_attrs->nsections = 0;
1031 sattr = §_attrs->attrs[0];
1032 gattr = §_attrs->grp.attrs[0];
1033 for (i = 0; i < nsect; i++) {
1034 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1036 sattr->address = sechdrs[i].sh_addr;
1037 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1039 if (sattr->name == NULL)
1041 sect_attrs->nsections++;
1042 sattr->mattr.show = module_sect_show;
1043 sattr->mattr.store = NULL;
1044 sattr->mattr.attr.name = sattr->name;
1045 sattr->mattr.attr.mode = S_IRUGO;
1046 *(gattr++) = &(sattr++)->mattr.attr;
1050 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1053 mod->sect_attrs = sect_attrs;
1056 free_sect_attrs(sect_attrs);
1059 static void remove_sect_attrs(struct module *mod)
1061 if (mod->sect_attrs) {
1062 sysfs_remove_group(&mod->mkobj.kobj,
1063 &mod->sect_attrs->grp);
1064 /* We are positive that no one is using any sect attrs
1065 * at this point. Deallocate immediately. */
1066 free_sect_attrs(mod->sect_attrs);
1067 mod->sect_attrs = NULL;
1072 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1075 struct module_notes_attrs {
1076 struct kobject *dir;
1078 struct bin_attribute attrs[0];
1081 static ssize_t module_notes_read(struct kobject *kobj,
1082 struct bin_attribute *bin_attr,
1083 char *buf, loff_t pos, size_t count)
1086 * The caller checked the pos and count against our size.
1088 memcpy(buf, bin_attr->private + pos, count);
1092 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1095 if (notes_attrs->dir) {
1097 sysfs_remove_bin_file(notes_attrs->dir,
1098 ¬es_attrs->attrs[i]);
1099 kobject_del(notes_attrs->dir);
1104 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1105 char *secstrings, Elf_Shdr *sechdrs)
1107 unsigned int notes, loaded, i;
1108 struct module_notes_attrs *notes_attrs;
1109 struct bin_attribute *nattr;
1111 /* Count notes sections and allocate structures. */
1113 for (i = 0; i < nsect; i++)
1114 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1115 (sechdrs[i].sh_type == SHT_NOTE))
1121 notes_attrs = kzalloc(sizeof(*notes_attrs)
1122 + notes * sizeof(notes_attrs->attrs[0]),
1124 if (notes_attrs == NULL)
1127 notes_attrs->notes = notes;
1128 nattr = ¬es_attrs->attrs[0];
1129 for (loaded = i = 0; i < nsect; ++i) {
1130 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1132 if (sechdrs[i].sh_type == SHT_NOTE) {
1133 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1134 nattr->attr.mode = S_IRUGO;
1135 nattr->size = sechdrs[i].sh_size;
1136 nattr->private = (void *) sechdrs[i].sh_addr;
1137 nattr->read = module_notes_read;
1143 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1144 if (!notes_attrs->dir)
1147 for (i = 0; i < notes; ++i)
1148 if (sysfs_create_bin_file(notes_attrs->dir,
1149 ¬es_attrs->attrs[i]))
1152 mod->notes_attrs = notes_attrs;
1156 free_notes_attrs(notes_attrs, i);
1159 static void remove_notes_attrs(struct module *mod)
1161 if (mod->notes_attrs)
1162 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1167 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1168 char *sectstrings, Elf_Shdr *sechdrs)
1172 static inline void remove_sect_attrs(struct module *mod)
1176 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1177 char *sectstrings, Elf_Shdr *sechdrs)
1181 static inline void remove_notes_attrs(struct module *mod)
1184 #endif /* CONFIG_KALLSYMS */
1187 int module_add_modinfo_attrs(struct module *mod)
1189 struct module_attribute *attr;
1190 struct module_attribute *temp_attr;
1194 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1195 (ARRAY_SIZE(modinfo_attrs) + 1)),
1197 if (!mod->modinfo_attrs)
1200 temp_attr = mod->modinfo_attrs;
1201 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1203 (attr->test && attr->test(mod))) {
1204 memcpy(temp_attr, attr, sizeof(*temp_attr));
1205 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1212 void module_remove_modinfo_attrs(struct module *mod)
1214 struct module_attribute *attr;
1217 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1218 /* pick a field to test for end of list */
1219 if (!attr->attr.name)
1221 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1225 kfree(mod->modinfo_attrs);
1230 int mod_sysfs_init(struct module *mod)
1234 if (!module_sysfs_initialized) {
1235 printk(KERN_ERR "%s: module sysfs not initialized\n",
1240 mod->mkobj.mod = mod;
1242 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1243 mod->mkobj.kobj.kset = module_kset;
1244 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1247 kobject_put(&mod->mkobj.kobj);
1249 /* delay uevent until full sysfs population */
1254 int mod_sysfs_setup(struct module *mod,
1255 struct kernel_param *kparam,
1256 unsigned int num_params)
1260 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1261 if (!mod->holders_dir) {
1266 err = module_param_sysfs_setup(mod, kparam, num_params);
1268 goto out_unreg_holders;
1270 err = module_add_modinfo_attrs(mod);
1272 goto out_unreg_param;
1274 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1278 module_param_sysfs_remove(mod);
1280 kobject_put(mod->holders_dir);
1282 kobject_put(&mod->mkobj.kobj);
1287 static void mod_kobject_remove(struct module *mod)
1289 module_remove_modinfo_attrs(mod);
1290 module_param_sysfs_remove(mod);
1291 kobject_put(mod->mkobj.drivers_dir);
1292 kobject_put(mod->holders_dir);
1293 kobject_put(&mod->mkobj.kobj);
1297 * unlink the module with the whole machine is stopped with interrupts off
1298 * - this defends against kallsyms not taking locks
1300 static int __unlink_module(void *_mod)
1302 struct module *mod = _mod;
1303 list_del(&mod->list);
1307 /* Free a module, remove from lists, etc (must hold module_mutex). */
1308 static void free_module(struct module *mod)
1310 /* Delete from various lists */
1311 stop_machine_run(__unlink_module, mod, NR_CPUS);
1312 remove_notes_attrs(mod);
1313 remove_sect_attrs(mod);
1314 mod_kobject_remove(mod);
1316 unwind_remove_table(mod->unwind_info, 0);
1318 /* Arch-specific cleanup. */
1319 module_arch_cleanup(mod);
1321 /* Module unload stuff */
1322 module_unload_free(mod);
1324 /* This may be NULL, but that's OK */
1325 module_free(mod, mod->module_init);
1328 percpu_modfree(mod->percpu);
1330 /* Free lock-classes: */
1331 lockdep_free_key_range(mod->module_core, mod->core_size);
1333 /* Finally, free the core (containing the module structure) */
1334 module_free(mod, mod->module_core);
1337 void *__symbol_get(const char *symbol)
1339 struct module *owner;
1340 unsigned long value;
1341 const unsigned long *crc;
1344 value = __find_symbol(symbol, &owner, &crc, 1);
1345 if (value && strong_try_module_get(owner) != 0)
1349 return (void *)value;
1351 EXPORT_SYMBOL_GPL(__symbol_get);
1354 * Ensure that an exported symbol [global namespace] does not already exist
1355 * in the kernel or in some other module's exported symbol table.
1357 static int verify_export_symbols(struct module *mod)
1359 const char *name = NULL;
1360 unsigned long i, ret = 0;
1361 struct module *owner;
1362 const unsigned long *crc;
1364 for (i = 0; i < mod->num_syms; i++)
1365 if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
1366 name = mod->syms[i].name;
1371 for (i = 0; i < mod->num_gpl_syms; i++)
1372 if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
1373 name = mod->gpl_syms[i].name;
1380 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1381 mod->name, name, module_name(owner));
1386 /* Change all symbols so that st_value encodes the pointer directly. */
1387 static int simplify_symbols(Elf_Shdr *sechdrs,
1388 unsigned int symindex,
1390 unsigned int versindex,
1391 unsigned int pcpuindex,
1394 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1395 unsigned long secbase;
1396 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1399 for (i = 1; i < n; i++) {
1400 switch (sym[i].st_shndx) {
1402 /* We compiled with -fno-common. These are not
1403 supposed to happen. */
1404 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1405 printk("%s: please compile with -fno-common\n",
1411 /* Don't need to do anything */
1412 DEBUGP("Absolute symbol: 0x%08lx\n",
1413 (long)sym[i].st_value);
1418 = resolve_symbol(sechdrs, versindex,
1419 strtab + sym[i].st_name, mod);
1421 /* Ok if resolved. */
1422 if (sym[i].st_value != 0)
1425 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1428 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1429 mod->name, strtab + sym[i].st_name);
1434 /* Divert to percpu allocation if a percpu var. */
1435 if (sym[i].st_shndx == pcpuindex)
1436 secbase = (unsigned long)mod->percpu;
1438 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1439 sym[i].st_value += secbase;
1447 /* Update size with this section: return offset. */
1448 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1452 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1453 *size = ret + sechdr->sh_size;
1457 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1458 might -- code, read-only data, read-write data, small data. Tally
1459 sizes, and place the offsets into sh_entsize fields: high bit means it
1461 static void layout_sections(struct module *mod,
1462 const Elf_Ehdr *hdr,
1464 const char *secstrings)
1466 static unsigned long const masks[][2] = {
1467 /* NOTE: all executable code must be the first section
1468 * in this array; otherwise modify the text_size
1469 * finder in the two loops below */
1470 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1471 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1472 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1473 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1477 for (i = 0; i < hdr->e_shnum; i++)
1478 sechdrs[i].sh_entsize = ~0UL;
1480 DEBUGP("Core section allocation order:\n");
1481 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1482 for (i = 0; i < hdr->e_shnum; ++i) {
1483 Elf_Shdr *s = &sechdrs[i];
1485 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1486 || (s->sh_flags & masks[m][1])
1487 || s->sh_entsize != ~0UL
1488 || strncmp(secstrings + s->sh_name,
1491 s->sh_entsize = get_offset(&mod->core_size, s);
1492 DEBUGP("\t%s\n", secstrings + s->sh_name);
1495 mod->core_text_size = mod->core_size;
1498 DEBUGP("Init section allocation order:\n");
1499 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1500 for (i = 0; i < hdr->e_shnum; ++i) {
1501 Elf_Shdr *s = &sechdrs[i];
1503 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1504 || (s->sh_flags & masks[m][1])
1505 || s->sh_entsize != ~0UL
1506 || strncmp(secstrings + s->sh_name,
1509 s->sh_entsize = (get_offset(&mod->init_size, s)
1510 | INIT_OFFSET_MASK);
1511 DEBUGP("\t%s\n", secstrings + s->sh_name);
1514 mod->init_text_size = mod->init_size;
1518 static void set_license(struct module *mod, const char *license)
1521 license = "unspecified";
1523 if (!license_is_gpl_compatible(license)) {
1524 if (!(tainted & TAINT_PROPRIETARY_MODULE))
1525 printk(KERN_WARNING "%s: module license '%s' taints "
1526 "kernel.\n", mod->name, license);
1527 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1531 /* Parse tag=value strings from .modinfo section */
1532 static char *next_string(char *string, unsigned long *secsize)
1534 /* Skip non-zero chars */
1537 if ((*secsize)-- <= 1)
1541 /* Skip any zero padding. */
1542 while (!string[0]) {
1544 if ((*secsize)-- <= 1)
1550 static char *get_modinfo(Elf_Shdr *sechdrs,
1555 unsigned int taglen = strlen(tag);
1556 unsigned long size = sechdrs[info].sh_size;
1558 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1559 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1560 return p + taglen + 1;
1565 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1566 unsigned int infoindex)
1568 struct module_attribute *attr;
1571 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1574 get_modinfo(sechdrs,
1580 #ifdef CONFIG_KALLSYMS
1581 static int is_exported(const char *name, const struct module *mod)
1583 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1586 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1593 static char elf_type(const Elf_Sym *sym,
1595 const char *secstrings,
1598 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1599 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1604 if (sym->st_shndx == SHN_UNDEF)
1606 if (sym->st_shndx == SHN_ABS)
1608 if (sym->st_shndx >= SHN_LORESERVE)
1610 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1612 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1613 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1614 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1616 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1621 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1622 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1627 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1628 ".debug", strlen(".debug")) == 0)
1633 static void add_kallsyms(struct module *mod,
1635 unsigned int symindex,
1636 unsigned int strindex,
1637 const char *secstrings)
1641 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1642 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1643 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1645 /* Set types up while we still have access to sections. */
1646 for (i = 0; i < mod->num_symtab; i++)
1647 mod->symtab[i].st_info
1648 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1651 static inline void add_kallsyms(struct module *mod,
1653 unsigned int symindex,
1654 unsigned int strindex,
1655 const char *secstrings)
1658 #endif /* CONFIG_KALLSYMS */
1660 /* Allocate and load the module: note that size of section 0 is always
1661 zero, and we rely on this for optional sections. */
1662 static struct module *load_module(void __user *umod,
1664 const char __user *uargs)
1668 char *secstrings, *args, *modmagic, *strtab = NULL;
1670 unsigned int symindex = 0;
1671 unsigned int strindex = 0;
1672 unsigned int setupindex;
1673 unsigned int exindex;
1674 unsigned int exportindex;
1675 unsigned int modindex;
1676 unsigned int obsparmindex;
1677 unsigned int infoindex;
1678 unsigned int gplindex;
1679 unsigned int crcindex;
1680 unsigned int gplcrcindex;
1681 unsigned int versindex;
1682 unsigned int pcpuindex;
1683 unsigned int gplfutureindex;
1684 unsigned int gplfuturecrcindex;
1685 unsigned int unwindex = 0;
1686 unsigned int unusedindex;
1687 unsigned int unusedcrcindex;
1688 unsigned int unusedgplindex;
1689 unsigned int unusedgplcrcindex;
1690 unsigned int markersindex;
1691 unsigned int markersstringsindex;
1694 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1695 struct exception_table_entry *extable;
1696 mm_segment_t old_fs;
1698 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1700 if (len < sizeof(*hdr))
1701 return ERR_PTR(-ENOEXEC);
1703 /* Suck in entire file: we'll want most of it. */
1704 /* vmalloc barfs on "unusual" numbers. Check here */
1705 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1706 return ERR_PTR(-ENOMEM);
1707 if (copy_from_user(hdr, umod, len) != 0) {
1712 /* Sanity checks against insmoding binaries or wrong arch,
1713 weird elf version */
1714 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1715 || hdr->e_type != ET_REL
1716 || !elf_check_arch(hdr)
1717 || hdr->e_shentsize != sizeof(*sechdrs)) {
1722 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1725 /* Convenience variables */
1726 sechdrs = (void *)hdr + hdr->e_shoff;
1727 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1728 sechdrs[0].sh_addr = 0;
1730 for (i = 1; i < hdr->e_shnum; i++) {
1731 if (sechdrs[i].sh_type != SHT_NOBITS
1732 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1735 /* Mark all sections sh_addr with their address in the
1737 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1739 /* Internal symbols and strings. */
1740 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1742 strindex = sechdrs[i].sh_link;
1743 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1745 #ifndef CONFIG_MODULE_UNLOAD
1746 /* Don't load .exit sections */
1747 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1748 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1752 modindex = find_sec(hdr, sechdrs, secstrings,
1753 ".gnu.linkonce.this_module");
1755 printk(KERN_WARNING "No module found in object\n");
1759 mod = (void *)sechdrs[modindex].sh_addr;
1761 if (symindex == 0) {
1762 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1768 /* Optional sections */
1769 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1770 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1771 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1772 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1773 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
1774 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1775 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1776 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1777 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1778 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
1779 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1780 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1781 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1782 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1783 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1784 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1785 #ifdef ARCH_UNWIND_SECTION_NAME
1786 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1789 /* Don't keep modinfo section */
1790 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1791 #ifdef CONFIG_KALLSYMS
1792 /* Keep symbol and string tables for decoding later. */
1793 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1794 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1797 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1799 /* Check module struct version now, before we try to use module. */
1800 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1805 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1806 /* This is allowed: modprobe --force will invalidate it. */
1808 add_taint_module(mod, TAINT_FORCED_MODULE);
1809 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1811 } else if (!same_magic(modmagic, vermagic)) {
1812 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1813 mod->name, modmagic, vermagic);
1818 /* Now copy in args */
1819 args = strndup_user(uargs, ~0UL >> 1);
1821 err = PTR_ERR(args);
1825 if (find_module(mod->name)) {
1830 mod->state = MODULE_STATE_COMING;
1832 /* Allow arches to frob section contents and sizes. */
1833 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1838 /* We have a special allocation for this section. */
1839 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1840 sechdrs[pcpuindex].sh_addralign,
1846 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1847 mod->percpu = percpu;
1850 /* Determine total sizes, and put offsets in sh_entsize. For now
1851 this is done generically; there doesn't appear to be any
1852 special cases for the architectures. */
1853 layout_sections(mod, hdr, sechdrs, secstrings);
1855 /* Do the allocs. */
1856 ptr = module_alloc(mod->core_size);
1861 memset(ptr, 0, mod->core_size);
1862 mod->module_core = ptr;
1864 ptr = module_alloc(mod->init_size);
1865 if (!ptr && mod->init_size) {
1869 memset(ptr, 0, mod->init_size);
1870 mod->module_init = ptr;
1872 /* Transfer each section which specifies SHF_ALLOC */
1873 DEBUGP("final section addresses:\n");
1874 for (i = 0; i < hdr->e_shnum; i++) {
1877 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1880 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1881 dest = mod->module_init
1882 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1884 dest = mod->module_core + sechdrs[i].sh_entsize;
1886 if (sechdrs[i].sh_type != SHT_NOBITS)
1887 memcpy(dest, (void *)sechdrs[i].sh_addr,
1888 sechdrs[i].sh_size);
1889 /* Update sh_addr to point to copy in image. */
1890 sechdrs[i].sh_addr = (unsigned long)dest;
1891 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1893 /* Module has been moved. */
1894 mod = (void *)sechdrs[modindex].sh_addr;
1896 /* Now we've moved module, initialize linked lists, etc. */
1897 module_unload_init(mod);
1899 /* add kobject, so we can reference it. */
1900 err = mod_sysfs_init(mod);
1904 /* Set up license info based on the info section */
1905 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1907 if (strcmp(mod->name, "ndiswrapper") == 0)
1908 add_taint(TAINT_PROPRIETARY_MODULE);
1909 if (strcmp(mod->name, "driverloader") == 0)
1910 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1912 /* Set up MODINFO_ATTR fields */
1913 setup_modinfo(mod, sechdrs, infoindex);
1915 /* Fix up syms, so that st_value is a pointer to location. */
1916 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1921 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1922 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1923 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1925 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1926 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1927 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1929 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1930 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1931 sizeof(*mod->gpl_future_syms);
1932 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
1933 sizeof(*mod->unused_syms);
1934 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
1935 sizeof(*mod->unused_gpl_syms);
1936 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1937 if (gplfuturecrcindex)
1938 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
1940 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
1942 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
1943 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
1944 if (unusedgplcrcindex)
1945 mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
1947 #ifdef CONFIG_MODVERSIONS
1948 if ((mod->num_syms && !crcindex) ||
1949 (mod->num_gpl_syms && !gplcrcindex) ||
1950 (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
1951 (mod->num_unused_syms && !unusedcrcindex) ||
1952 (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
1953 printk(KERN_WARNING "%s: No versions for exported symbols."
1954 " Tainting kernel.\n", mod->name);
1955 add_taint_module(mod, TAINT_FORCED_MODULE);
1958 markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
1959 markersstringsindex = find_sec(hdr, sechdrs, secstrings,
1960 "__markers_strings");
1962 /* Now do relocations. */
1963 for (i = 1; i < hdr->e_shnum; i++) {
1964 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1965 unsigned int info = sechdrs[i].sh_info;
1967 /* Not a valid relocation section? */
1968 if (info >= hdr->e_shnum)
1971 /* Don't bother with non-allocated sections */
1972 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1975 if (sechdrs[i].sh_type == SHT_REL)
1976 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1977 else if (sechdrs[i].sh_type == SHT_RELA)
1978 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1983 #ifdef CONFIG_MARKERS
1984 mod->markers = (void *)sechdrs[markersindex].sh_addr;
1986 sechdrs[markersindex].sh_size / sizeof(*mod->markers);
1989 /* Find duplicate symbols */
1990 err = verify_export_symbols(mod);
1995 /* Set up and sort exception table */
1996 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1997 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1998 sort_extable(extable, extable + mod->num_exentries);
2000 /* Finally, copy percpu area over. */
2001 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2002 sechdrs[pcpuindex].sh_size);
2004 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2006 #ifdef CONFIG_MARKERS
2008 marker_update_probe_range(mod->markers,
2009 mod->markers + mod->num_markers, NULL, NULL);
2011 err = module_finalize(hdr, sechdrs, mod);
2015 /* flush the icache in correct context */
2020 * Flush the instruction cache, since we've played with text.
2021 * Do it before processing of module parameters, so the module
2022 * can provide parameter accessor functions of its own.
2024 if (mod->module_init)
2025 flush_icache_range((unsigned long)mod->module_init,
2026 (unsigned long)mod->module_init
2028 flush_icache_range((unsigned long)mod->module_core,
2029 (unsigned long)mod->module_core + mod->core_size);
2035 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2038 /* Size of section 0 is 0, so this works well if no params */
2039 err = parse_args(mod->name, mod->args,
2040 (struct kernel_param *)
2041 sechdrs[setupindex].sh_addr,
2042 sechdrs[setupindex].sh_size
2043 / sizeof(struct kernel_param),
2048 err = mod_sysfs_setup(mod,
2049 (struct kernel_param *)
2050 sechdrs[setupindex].sh_addr,
2051 sechdrs[setupindex].sh_size
2052 / sizeof(struct kernel_param));
2055 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2056 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2058 /* Size of section 0 is 0, so this works well if no unwind info. */
2059 mod->unwind_info = unwind_add_table(mod,
2060 (void *)sechdrs[unwindex].sh_addr,
2061 sechdrs[unwindex].sh_size);
2063 /* Get rid of temporary copy */
2070 module_arch_cleanup(mod);
2072 kobject_del(&mod->mkobj.kobj);
2073 kobject_put(&mod->mkobj.kobj);
2075 module_unload_free(mod);
2076 module_free(mod, mod->module_init);
2078 module_free(mod, mod->module_core);
2081 percpu_modfree(percpu);
2086 return ERR_PTR(err);
2089 printk(KERN_ERR "Module len %lu truncated\n", len);
2095 * link the module with the whole machine is stopped with interrupts off
2096 * - this defends against kallsyms not taking locks
2098 static int __link_module(void *_mod)
2100 struct module *mod = _mod;
2101 list_add(&mod->list, &modules);
2105 /* This is where the real work happens */
2107 sys_init_module(void __user *umod,
2109 const char __user *uargs)
2114 /* Must have permission */
2115 if (!capable(CAP_SYS_MODULE))
2118 /* Only one module load at a time, please */
2119 if (mutex_lock_interruptible(&module_mutex) != 0)
2122 /* Do all the hard work */
2123 mod = load_module(umod, len, uargs);
2125 mutex_unlock(&module_mutex);
2126 return PTR_ERR(mod);
2129 /* Now sew it into the lists. They won't access us, since
2130 strong_try_module_get() will fail. */
2131 stop_machine_run(__link_module, mod, NR_CPUS);
2133 /* Drop lock so they can recurse */
2134 mutex_unlock(&module_mutex);
2136 blocking_notifier_call_chain(&module_notify_list,
2137 MODULE_STATE_COMING, mod);
2139 /* Start the module */
2140 if (mod->init != NULL)
2143 /* Init routine failed: abort. Try to protect us from
2144 buggy refcounters. */
2145 mod->state = MODULE_STATE_GOING;
2146 synchronize_sched();
2148 mutex_lock(&module_mutex);
2150 mutex_unlock(&module_mutex);
2151 wake_up(&module_wq);
2155 /* Now it's a first class citizen! */
2156 mutex_lock(&module_mutex);
2157 mod->state = MODULE_STATE_LIVE;
2158 /* Drop initial reference. */
2160 unwind_remove_table(mod->unwind_info, 1);
2161 module_free(mod, mod->module_init);
2162 mod->module_init = NULL;
2164 mod->init_text_size = 0;
2165 mutex_unlock(&module_mutex);
2166 wake_up(&module_wq);
2171 static inline int within(unsigned long addr, void *start, unsigned long size)
2173 return ((void *)addr >= start && (void *)addr < start + size);
2176 #ifdef CONFIG_KALLSYMS
2178 * This ignores the intensely annoying "mapping symbols" found
2179 * in ARM ELF files: $a, $t and $d.
2181 static inline int is_arm_mapping_symbol(const char *str)
2183 return str[0] == '$' && strchr("atd", str[1])
2184 && (str[2] == '\0' || str[2] == '.');
2187 static const char *get_ksymbol(struct module *mod,
2189 unsigned long *size,
2190 unsigned long *offset)
2192 unsigned int i, best = 0;
2193 unsigned long nextval;
2195 /* At worse, next value is at end of module */
2196 if (within(addr, mod->module_init, mod->init_size))
2197 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2199 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2201 /* Scan for closest preceeding symbol, and next symbol. (ELF
2202 starts real symbols at 1). */
2203 for (i = 1; i < mod->num_symtab; i++) {
2204 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2207 /* We ignore unnamed symbols: they're uninformative
2208 * and inserted at a whim. */
2209 if (mod->symtab[i].st_value <= addr
2210 && mod->symtab[i].st_value > mod->symtab[best].st_value
2211 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2212 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2214 if (mod->symtab[i].st_value > addr
2215 && mod->symtab[i].st_value < nextval
2216 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2217 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2218 nextval = mod->symtab[i].st_value;
2225 *size = nextval - mod->symtab[best].st_value;
2227 *offset = addr - mod->symtab[best].st_value;
2228 return mod->strtab + mod->symtab[best].st_name;
2231 /* For kallsyms to ask for address resolution. NULL means not found.
2232 We don't lock, as this is used for oops resolution and races are a
2234 /* FIXME: Risky: returns a pointer into a module w/o lock */
2235 const char *module_address_lookup(unsigned long addr,
2236 unsigned long *size,
2237 unsigned long *offset,
2241 const char *ret = NULL;
2244 list_for_each_entry(mod, &modules, list) {
2245 if (within(addr, mod->module_init, mod->init_size)
2246 || within(addr, mod->module_core, mod->core_size)) {
2248 *modname = mod->name;
2249 ret = get_ksymbol(mod, addr, size, offset);
2257 int lookup_module_symbol_name(unsigned long addr, char *symname)
2262 list_for_each_entry(mod, &modules, list) {
2263 if (within(addr, mod->module_init, mod->init_size) ||
2264 within(addr, mod->module_core, mod->core_size)) {
2267 sym = get_ksymbol(mod, addr, NULL, NULL);
2270 strlcpy(symname, sym, KSYM_NAME_LEN);
2280 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2281 unsigned long *offset, char *modname, char *name)
2286 list_for_each_entry(mod, &modules, list) {
2287 if (within(addr, mod->module_init, mod->init_size) ||
2288 within(addr, mod->module_core, mod->core_size)) {
2291 sym = get_ksymbol(mod, addr, size, offset);
2295 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2297 strlcpy(name, sym, KSYM_NAME_LEN);
2307 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2308 char *name, char *module_name, int *exported)
2313 list_for_each_entry(mod, &modules, list) {
2314 if (symnum < mod->num_symtab) {
2315 *value = mod->symtab[symnum].st_value;
2316 *type = mod->symtab[symnum].st_info;
2317 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2319 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2320 *exported = is_exported(name, mod);
2324 symnum -= mod->num_symtab;
2330 static unsigned long mod_find_symname(struct module *mod, const char *name)
2334 for (i = 0; i < mod->num_symtab; i++)
2335 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2336 mod->symtab[i].st_info != 'U')
2337 return mod->symtab[i].st_value;
2341 /* Look for this name: can be of form module:name. */
2342 unsigned long module_kallsyms_lookup_name(const char *name)
2346 unsigned long ret = 0;
2348 /* Don't lock: we're in enough trouble already. */
2350 if ((colon = strchr(name, ':')) != NULL) {
2352 if ((mod = find_module(name)) != NULL)
2353 ret = mod_find_symname(mod, colon+1);
2356 list_for_each_entry(mod, &modules, list)
2357 if ((ret = mod_find_symname(mod, name)) != 0)
2363 #endif /* CONFIG_KALLSYMS */
2365 /* Called by the /proc file system to return a list of modules. */
2366 static void *m_start(struct seq_file *m, loff_t *pos)
2368 mutex_lock(&module_mutex);
2369 return seq_list_start(&modules, *pos);
2372 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2374 return seq_list_next(p, &modules, pos);
2377 static void m_stop(struct seq_file *m, void *p)
2379 mutex_unlock(&module_mutex);
2382 static char *module_flags(struct module *mod, char *buf)
2387 mod->state == MODULE_STATE_GOING ||
2388 mod->state == MODULE_STATE_COMING) {
2390 if (mod->taints & TAINT_PROPRIETARY_MODULE)
2392 if (mod->taints & TAINT_FORCED_MODULE)
2395 * TAINT_FORCED_RMMOD: could be added.
2396 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2400 /* Show a - for module-is-being-unloaded */
2401 if (mod->state == MODULE_STATE_GOING)
2403 /* Show a + for module-is-being-loaded */
2404 if (mod->state == MODULE_STATE_COMING)
2413 static int m_show(struct seq_file *m, void *p)
2415 struct module *mod = list_entry(p, struct module, list);
2418 seq_printf(m, "%s %lu",
2419 mod->name, mod->init_size + mod->core_size);
2420 print_unload_info(m, mod);
2422 /* Informative for users. */
2423 seq_printf(m, " %s",
2424 mod->state == MODULE_STATE_GOING ? "Unloading":
2425 mod->state == MODULE_STATE_COMING ? "Loading":
2427 /* Used by oprofile and other similar tools. */
2428 seq_printf(m, " 0x%p", mod->module_core);
2432 seq_printf(m, " %s", module_flags(mod, buf));
2434 seq_printf(m, "\n");
2438 /* Format: modulename size refcount deps address
2440 Where refcount is a number or -, and deps is a comma-separated list
2443 const struct seq_operations modules_op = {
2450 /* Given an address, look for it in the module exception tables. */
2451 const struct exception_table_entry *search_module_extables(unsigned long addr)
2453 const struct exception_table_entry *e = NULL;
2457 list_for_each_entry(mod, &modules, list) {
2458 if (mod->num_exentries == 0)
2461 e = search_extable(mod->extable,
2462 mod->extable + mod->num_exentries - 1,
2469 /* Now, if we found one, we are running inside it now, hence
2470 we cannot unload the module, hence no refcnt needed. */
2475 * Is this a valid module address?
2477 int is_module_address(unsigned long addr)
2483 list_for_each_entry(mod, &modules, list) {
2484 if (within(addr, mod->module_core, mod->core_size)) {
2496 /* Is this a valid kernel address? */
2497 struct module *__module_text_address(unsigned long addr)
2501 list_for_each_entry(mod, &modules, list)
2502 if (within(addr, mod->module_init, mod->init_text_size)
2503 || within(addr, mod->module_core, mod->core_text_size))
2508 struct module *module_text_address(unsigned long addr)
2513 mod = __module_text_address(addr);
2519 /* Don't grab lock, we're oopsing. */
2520 void print_modules(void)
2525 printk("Modules linked in:");
2526 list_for_each_entry(mod, &modules, list)
2527 printk(" %s%s", mod->name, module_flags(mod, buf));
2528 if (last_unloaded_module[0])
2529 printk(" [last unloaded: %s]", last_unloaded_module);
2533 #ifdef CONFIG_MODVERSIONS
2534 /* Generate the signature for struct module here, too, for modversions. */
2535 void struct_module(struct module *mod) { return; }
2536 EXPORT_SYMBOL(struct_module);
2539 #ifdef CONFIG_MARKERS
2540 void module_update_markers(struct module *probe_module, int *refcount)
2544 mutex_lock(&module_mutex);
2545 list_for_each_entry(mod, &modules, list)
2547 marker_update_probe_range(mod->markers,
2548 mod->markers + mod->num_markers,
2549 probe_module, refcount);
2550 mutex_unlock(&module_mutex);