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/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/sched.h>
39 #include <linux/stop_machine.h>
40 #include <linux/device.h>
41 #include <linux/string.h>
42 #include <linux/mutex.h>
43 #include <linux/unwind.h>
44 #include <asm/uaccess.h>
45 #include <asm/semaphore.h>
46 #include <asm/cacheflush.h>
47 #include <linux/license.h>
49 extern int module_sysfs_initialized;
54 #define DEBUGP(fmt , a...)
57 #ifndef ARCH_SHF_SMALL
58 #define ARCH_SHF_SMALL 0
61 /* If this is set, the section belongs in the init part of the module */
62 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
64 /* List of modules, protected by module_mutex or preempt_disable
65 * (add/delete uses stop_machine). */
66 static DEFINE_MUTEX(module_mutex);
67 static LIST_HEAD(modules);
69 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
71 int register_module_notifier(struct notifier_block * nb)
73 return blocking_notifier_chain_register(&module_notify_list, nb);
75 EXPORT_SYMBOL(register_module_notifier);
77 int unregister_module_notifier(struct notifier_block * nb)
79 return blocking_notifier_chain_unregister(&module_notify_list, nb);
81 EXPORT_SYMBOL(unregister_module_notifier);
83 /* We require a truly strong try_module_get() */
84 static inline int strong_try_module_get(struct module *mod)
86 if (mod && mod->state == MODULE_STATE_COMING)
88 return try_module_get(mod);
91 static inline void add_taint_module(struct module *mod, unsigned flag)
98 * A thread that wants to hold a reference to a module only while it
99 * is running can call this to safely exit. nfsd and lockd use this.
101 void __module_put_and_exit(struct module *mod, long code)
106 EXPORT_SYMBOL(__module_put_and_exit);
108 /* Find a module section: 0 means not found. */
109 static unsigned int find_sec(Elf_Ehdr *hdr,
111 const char *secstrings,
116 for (i = 1; i < hdr->e_shnum; i++)
117 /* Alloc bit cleared means "ignore it." */
118 if ((sechdrs[i].sh_flags & SHF_ALLOC)
119 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
124 /* Provided by the linker */
125 extern const struct kernel_symbol __start___ksymtab[];
126 extern const struct kernel_symbol __stop___ksymtab[];
127 extern const struct kernel_symbol __start___ksymtab_gpl[];
128 extern const struct kernel_symbol __stop___ksymtab_gpl[];
129 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
130 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
131 extern const struct kernel_symbol __start___ksymtab_unused[];
132 extern const struct kernel_symbol __stop___ksymtab_unused[];
133 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
134 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
135 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
136 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
137 extern const unsigned long __start___kcrctab[];
138 extern const unsigned long __start___kcrctab_gpl[];
139 extern const unsigned long __start___kcrctab_gpl_future[];
140 extern const unsigned long __start___kcrctab_unused[];
141 extern const unsigned long __start___kcrctab_unused_gpl[];
143 #ifndef CONFIG_MODVERSIONS
144 #define symversion(base, idx) NULL
146 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
149 /* lookup symbol in given range of kernel_symbols */
150 static const struct kernel_symbol *lookup_symbol(const char *name,
151 const struct kernel_symbol *start,
152 const struct kernel_symbol *stop)
154 const struct kernel_symbol *ks = start;
155 for (; ks < stop; ks++)
156 if (strcmp(ks->name, name) == 0)
161 static void printk_unused_warning(const char *name)
163 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
164 "however this module is using it.\n", name);
165 printk(KERN_WARNING "This symbol will go away in the future.\n");
166 printk(KERN_WARNING "Please evalute if this is the right api to use, "
167 "and if it really is, submit a report the linux kernel "
168 "mailinglist together with submitting your code for "
172 /* Find a symbol, return value, crc and module which owns it */
173 static unsigned long __find_symbol(const char *name,
174 struct module **owner,
175 const unsigned long **crc,
179 const struct kernel_symbol *ks;
181 /* Core kernel first. */
183 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
185 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
189 ks = lookup_symbol(name, __start___ksymtab_gpl,
190 __stop___ksymtab_gpl);
192 *crc = symversion(__start___kcrctab_gpl,
193 (ks - __start___ksymtab_gpl));
197 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
198 __stop___ksymtab_gpl_future);
201 printk(KERN_WARNING "Symbol %s is being used "
202 "by a non-GPL module, which will not "
203 "be allowed in the future\n", name);
204 printk(KERN_WARNING "Please see the file "
205 "Documentation/feature-removal-schedule.txt "
206 "in the kernel source tree for more "
209 *crc = symversion(__start___kcrctab_gpl_future,
210 (ks - __start___ksymtab_gpl_future));
214 ks = lookup_symbol(name, __start___ksymtab_unused,
215 __stop___ksymtab_unused);
217 printk_unused_warning(name);
218 *crc = symversion(__start___kcrctab_unused,
219 (ks - __start___ksymtab_unused));
224 ks = lookup_symbol(name, __start___ksymtab_unused_gpl,
225 __stop___ksymtab_unused_gpl);
227 printk_unused_warning(name);
228 *crc = symversion(__start___kcrctab_unused_gpl,
229 (ks - __start___ksymtab_unused_gpl));
233 /* Now try modules. */
234 list_for_each_entry(mod, &modules, list) {
236 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
238 *crc = symversion(mod->crcs, (ks - mod->syms));
243 ks = lookup_symbol(name, mod->gpl_syms,
244 mod->gpl_syms + mod->num_gpl_syms);
246 *crc = symversion(mod->gpl_crcs,
247 (ks - mod->gpl_syms));
251 ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms);
253 printk_unused_warning(name);
254 *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms));
259 ks = lookup_symbol(name, mod->unused_gpl_syms,
260 mod->unused_gpl_syms + mod->num_unused_gpl_syms);
262 printk_unused_warning(name);
263 *crc = symversion(mod->unused_gpl_crcs,
264 (ks - mod->unused_gpl_syms));
268 ks = lookup_symbol(name, mod->gpl_future_syms,
269 (mod->gpl_future_syms +
270 mod->num_gpl_future_syms));
273 printk(KERN_WARNING "Symbol %s is being used "
274 "by a non-GPL module, which will not "
275 "be allowed in the future\n", name);
276 printk(KERN_WARNING "Please see the file "
277 "Documentation/feature-removal-schedule.txt "
278 "in the kernel source tree for more "
281 *crc = symversion(mod->gpl_future_crcs,
282 (ks - mod->gpl_future_syms));
286 DEBUGP("Failed to find symbol %s\n", name);
290 /* Search for module by name: must hold module_mutex. */
291 static struct module *find_module(const char *name)
295 list_for_each_entry(mod, &modules, list) {
296 if (strcmp(mod->name, name) == 0)
303 /* Number of blocks used and allocated. */
304 static unsigned int pcpu_num_used, pcpu_num_allocated;
305 /* Size of each block. -ve means used. */
306 static int *pcpu_size;
308 static int split_block(unsigned int i, unsigned short size)
310 /* Reallocation required? */
311 if (pcpu_num_used + 1 > pcpu_num_allocated) {
314 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
319 pcpu_num_allocated *= 2;
323 /* Insert a new subblock */
324 memmove(&pcpu_size[i+1], &pcpu_size[i],
325 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
328 pcpu_size[i+1] -= size;
333 static inline unsigned int block_size(int val)
340 /* Created by linker magic */
341 extern char __per_cpu_start[], __per_cpu_end[];
343 static void *percpu_modalloc(unsigned long size, unsigned long align,
350 if (align > PAGE_SIZE) {
351 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
352 name, align, PAGE_SIZE);
356 ptr = __per_cpu_start;
357 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
358 /* Extra for alignment requirement. */
359 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
360 BUG_ON(i == 0 && extra != 0);
362 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
365 /* Transfer extra to previous block. */
366 if (pcpu_size[i-1] < 0)
367 pcpu_size[i-1] -= extra;
369 pcpu_size[i-1] += extra;
370 pcpu_size[i] -= extra;
373 /* Split block if warranted */
374 if (pcpu_size[i] - size > sizeof(unsigned long))
375 if (!split_block(i, size))
379 pcpu_size[i] = -pcpu_size[i];
383 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
388 static void percpu_modfree(void *freeme)
391 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
393 /* First entry is core kernel percpu data. */
394 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
396 pcpu_size[i] = -pcpu_size[i];
403 /* Merge with previous? */
404 if (pcpu_size[i-1] >= 0) {
405 pcpu_size[i-1] += pcpu_size[i];
407 memmove(&pcpu_size[i], &pcpu_size[i+1],
408 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
411 /* Merge with next? */
412 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
413 pcpu_size[i] += pcpu_size[i+1];
415 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
416 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
420 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
422 const char *secstrings)
424 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
427 static int percpu_modinit(void)
430 pcpu_num_allocated = 2;
431 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
433 /* Static in-kernel percpu data (used). */
434 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
436 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
437 if (pcpu_size[1] < 0) {
438 printk(KERN_ERR "No per-cpu room for modules.\n");
444 __initcall(percpu_modinit);
445 #else /* ... !CONFIG_SMP */
446 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
451 static inline void percpu_modfree(void *pcpuptr)
455 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
457 const char *secstrings)
461 static inline void percpu_modcopy(void *pcpudst, const void *src,
464 /* pcpusec should be 0, and size of that section should be 0. */
467 #endif /* CONFIG_SMP */
469 #define MODINFO_ATTR(field) \
470 static void setup_modinfo_##field(struct module *mod, const char *s) \
472 mod->field = kstrdup(s, GFP_KERNEL); \
474 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
475 struct module *mod, char *buffer) \
477 return sprintf(buffer, "%s\n", mod->field); \
479 static int modinfo_##field##_exists(struct module *mod) \
481 return mod->field != NULL; \
483 static void free_modinfo_##field(struct module *mod) \
488 static struct module_attribute modinfo_##field = { \
489 .attr = { .name = __stringify(field), .mode = 0444 }, \
490 .show = show_modinfo_##field, \
491 .setup = setup_modinfo_##field, \
492 .test = modinfo_##field##_exists, \
493 .free = free_modinfo_##field, \
496 MODINFO_ATTR(version);
497 MODINFO_ATTR(srcversion);
499 #ifdef CONFIG_MODULE_UNLOAD
500 /* Init the unload section of the module. */
501 static void module_unload_init(struct module *mod)
505 INIT_LIST_HEAD(&mod->modules_which_use_me);
506 for (i = 0; i < NR_CPUS; i++)
507 local_set(&mod->ref[i].count, 0);
508 /* Hold reference count during initialization. */
509 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
510 /* Backwards compatibility macros put refcount during init. */
511 mod->waiter = current;
514 /* modules using other modules */
517 struct list_head list;
518 struct module *module_which_uses;
521 /* Does a already use b? */
522 static int already_uses(struct module *a, struct module *b)
524 struct module_use *use;
526 list_for_each_entry(use, &b->modules_which_use_me, list) {
527 if (use->module_which_uses == a) {
528 DEBUGP("%s uses %s!\n", a->name, b->name);
532 DEBUGP("%s does not use %s!\n", a->name, b->name);
536 /* Module a uses b */
537 static int use_module(struct module *a, struct module *b)
539 struct module_use *use;
542 if (b == NULL || already_uses(a, b)) return 1;
544 if (!strong_try_module_get(b))
547 DEBUGP("Allocating new usage for %s.\n", a->name);
548 use = kmalloc(sizeof(*use), GFP_ATOMIC);
550 printk("%s: out of memory loading\n", a->name);
555 use->module_which_uses = a;
556 list_add(&use->list, &b->modules_which_use_me);
557 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
561 /* Clear the unload stuff of the module. */
562 static void module_unload_free(struct module *mod)
566 list_for_each_entry(i, &modules, list) {
567 struct module_use *use;
569 list_for_each_entry(use, &i->modules_which_use_me, list) {
570 if (use->module_which_uses == mod) {
571 DEBUGP("%s unusing %s\n", mod->name, i->name);
573 list_del(&use->list);
575 sysfs_remove_link(i->holders_dir, mod->name);
576 /* There can be at most one match. */
583 #ifdef CONFIG_MODULE_FORCE_UNLOAD
584 static inline int try_force_unload(unsigned int flags)
586 int ret = (flags & O_TRUNC);
588 add_taint(TAINT_FORCED_RMMOD);
592 static inline int try_force_unload(unsigned int flags)
596 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
605 /* Whole machine is stopped with interrupts off when this runs. */
606 static int __try_stop_module(void *_sref)
608 struct stopref *sref = _sref;
610 /* If it's not unused, quit unless we are told to block. */
611 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
612 if (!(*sref->forced = try_force_unload(sref->flags)))
616 /* Mark it as dying. */
617 sref->mod->state = MODULE_STATE_GOING;
621 static int try_stop_module(struct module *mod, int flags, int *forced)
623 struct stopref sref = { mod, flags, forced };
625 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
628 unsigned int module_refcount(struct module *mod)
630 unsigned int i, total = 0;
632 for (i = 0; i < NR_CPUS; i++)
633 total += local_read(&mod->ref[i].count);
636 EXPORT_SYMBOL(module_refcount);
638 /* This exists whether we can unload or not */
639 static void free_module(struct module *mod);
641 static void wait_for_zero_refcount(struct module *mod)
643 /* Since we might sleep for some time, drop the semaphore first */
644 mutex_unlock(&module_mutex);
646 DEBUGP("Looking at refcount...\n");
647 set_current_state(TASK_UNINTERRUPTIBLE);
648 if (module_refcount(mod) == 0)
652 current->state = TASK_RUNNING;
653 mutex_lock(&module_mutex);
657 sys_delete_module(const char __user *name_user, unsigned int flags)
660 char name[MODULE_NAME_LEN];
663 if (!capable(CAP_SYS_MODULE))
666 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
668 name[MODULE_NAME_LEN-1] = '\0';
670 if (mutex_lock_interruptible(&module_mutex) != 0)
673 mod = find_module(name);
679 if (!list_empty(&mod->modules_which_use_me)) {
680 /* Other modules depend on us: get rid of them first. */
685 /* Doing init or already dying? */
686 if (mod->state != MODULE_STATE_LIVE) {
687 /* FIXME: if (force), slam module count and wake up
689 DEBUGP("%s already dying\n", mod->name);
694 /* If it has an init func, it must have an exit func to unload */
695 if (mod->init && !mod->exit) {
696 forced = try_force_unload(flags);
698 /* This module can't be removed */
704 /* Set this up before setting mod->state */
705 mod->waiter = current;
707 /* Stop the machine so refcounts can't move and disable module. */
708 ret = try_stop_module(mod, flags, &forced);
712 /* Never wait if forced. */
713 if (!forced && module_refcount(mod) != 0)
714 wait_for_zero_refcount(mod);
716 /* Final destruction now noone is using it. */
717 if (mod->exit != NULL) {
718 mutex_unlock(&module_mutex);
720 mutex_lock(&module_mutex);
725 mutex_unlock(&module_mutex);
729 static void print_unload_info(struct seq_file *m, struct module *mod)
731 struct module_use *use;
732 int printed_something = 0;
734 seq_printf(m, " %u ", module_refcount(mod));
736 /* Always include a trailing , so userspace can differentiate
737 between this and the old multi-field proc format. */
738 list_for_each_entry(use, &mod->modules_which_use_me, list) {
739 printed_something = 1;
740 seq_printf(m, "%s,", use->module_which_uses->name);
743 if (mod->init != NULL && mod->exit == NULL) {
744 printed_something = 1;
745 seq_printf(m, "[permanent],");
748 if (!printed_something)
752 void __symbol_put(const char *symbol)
754 struct module *owner;
755 const unsigned long *crc;
758 if (!__find_symbol(symbol, &owner, &crc, 1))
763 EXPORT_SYMBOL(__symbol_put);
765 void symbol_put_addr(void *addr)
767 struct module *modaddr;
769 if (core_kernel_text((unsigned long)addr))
772 if (!(modaddr = module_text_address((unsigned long)addr)))
776 EXPORT_SYMBOL_GPL(symbol_put_addr);
778 static ssize_t show_refcnt(struct module_attribute *mattr,
779 struct module *mod, char *buffer)
781 return sprintf(buffer, "%u\n", module_refcount(mod));
784 static struct module_attribute refcnt = {
785 .attr = { .name = "refcnt", .mode = 0444 },
789 void module_put(struct module *module)
792 unsigned int cpu = get_cpu();
793 local_dec(&module->ref[cpu].count);
794 /* Maybe they're waiting for us to drop reference? */
795 if (unlikely(!module_is_live(module)))
796 wake_up_process(module->waiter);
800 EXPORT_SYMBOL(module_put);
802 #else /* !CONFIG_MODULE_UNLOAD */
803 static void print_unload_info(struct seq_file *m, struct module *mod)
805 /* We don't know the usage count, or what modules are using. */
806 seq_printf(m, " - -");
809 static inline void module_unload_free(struct module *mod)
813 static inline int use_module(struct module *a, struct module *b)
815 return strong_try_module_get(b);
818 static inline void module_unload_init(struct module *mod)
821 #endif /* CONFIG_MODULE_UNLOAD */
823 static ssize_t show_initstate(struct module_attribute *mattr,
824 struct module *mod, char *buffer)
826 const char *state = "unknown";
828 switch (mod->state) {
829 case MODULE_STATE_LIVE:
832 case MODULE_STATE_COMING:
835 case MODULE_STATE_GOING:
839 return sprintf(buffer, "%s\n", state);
842 static struct module_attribute initstate = {
843 .attr = { .name = "initstate", .mode = 0444 },
844 .show = show_initstate,
847 static struct module_attribute *modinfo_attrs[] = {
851 #ifdef CONFIG_MODULE_UNLOAD
857 static const char vermagic[] = VERMAGIC_STRING;
859 #ifdef CONFIG_MODVERSIONS
860 static int check_version(Elf_Shdr *sechdrs,
861 unsigned int versindex,
864 const unsigned long *crc)
866 unsigned int i, num_versions;
867 struct modversion_info *versions;
869 /* Exporting module didn't supply crcs? OK, we're already tainted. */
873 versions = (void *) sechdrs[versindex].sh_addr;
874 num_versions = sechdrs[versindex].sh_size
875 / sizeof(struct modversion_info);
877 for (i = 0; i < num_versions; i++) {
878 if (strcmp(versions[i].name, symname) != 0)
881 if (versions[i].crc == *crc)
883 printk("%s: disagrees about version of symbol %s\n",
885 DEBUGP("Found checksum %lX vs module %lX\n",
886 *crc, versions[i].crc);
889 /* Not in module's version table. OK, but that taints the kernel. */
890 if (!(tainted & TAINT_FORCED_MODULE))
891 printk("%s: no version for \"%s\" found: kernel tainted.\n",
893 add_taint_module(mod, TAINT_FORCED_MODULE);
897 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
898 unsigned int versindex,
901 const unsigned long *crc;
902 struct module *owner;
904 if (!__find_symbol("struct_module", &owner, &crc, 1))
906 return check_version(sechdrs, versindex, "struct_module", mod,
910 /* First part is kernel version, which we ignore. */
911 static inline int same_magic(const char *amagic, const char *bmagic)
913 amagic += strcspn(amagic, " ");
914 bmagic += strcspn(bmagic, " ");
915 return strcmp(amagic, bmagic) == 0;
918 static inline int check_version(Elf_Shdr *sechdrs,
919 unsigned int versindex,
922 const unsigned long *crc)
927 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
928 unsigned int versindex,
934 static inline int same_magic(const char *amagic, const char *bmagic)
936 return strcmp(amagic, bmagic) == 0;
938 #endif /* CONFIG_MODVERSIONS */
940 /* Resolve a symbol for this module. I.e. if we find one, record usage.
941 Must be holding module_mutex. */
942 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
943 unsigned int versindex,
947 struct module *owner;
949 const unsigned long *crc;
951 ret = __find_symbol(name, &owner, &crc,
952 !(mod->taints & TAINT_PROPRIETARY_MODULE));
954 /* use_module can fail due to OOM, or module unloading */
955 if (!check_version(sechdrs, versindex, name, mod, crc) ||
956 !use_module(mod, owner))
964 * /sys/module/foo/sections stuff
965 * J. Corbet <corbet@lwn.net>
967 #ifdef CONFIG_KALLSYMS
968 static ssize_t module_sect_show(struct module_attribute *mattr,
969 struct module *mod, char *buf)
971 struct module_sect_attr *sattr =
972 container_of(mattr, struct module_sect_attr, mattr);
973 return sprintf(buf, "0x%lx\n", sattr->address);
976 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
980 for (section = 0; section < sect_attrs->nsections; section++)
981 kfree(sect_attrs->attrs[section].name);
985 static void add_sect_attrs(struct module *mod, unsigned int nsect,
986 char *secstrings, Elf_Shdr *sechdrs)
988 unsigned int nloaded = 0, i, size[2];
989 struct module_sect_attrs *sect_attrs;
990 struct module_sect_attr *sattr;
991 struct attribute **gattr;
993 /* Count loaded sections and allocate structures */
994 for (i = 0; i < nsect; i++)
995 if (sechdrs[i].sh_flags & SHF_ALLOC)
997 size[0] = ALIGN(sizeof(*sect_attrs)
998 + nloaded * sizeof(sect_attrs->attrs[0]),
999 sizeof(sect_attrs->grp.attrs[0]));
1000 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1001 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1002 if (sect_attrs == NULL)
1005 /* Setup section attributes. */
1006 sect_attrs->grp.name = "sections";
1007 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1009 sect_attrs->nsections = 0;
1010 sattr = §_attrs->attrs[0];
1011 gattr = §_attrs->grp.attrs[0];
1012 for (i = 0; i < nsect; i++) {
1013 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1015 sattr->address = sechdrs[i].sh_addr;
1016 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1018 if (sattr->name == NULL)
1020 sect_attrs->nsections++;
1021 sattr->mattr.show = module_sect_show;
1022 sattr->mattr.store = NULL;
1023 sattr->mattr.attr.name = sattr->name;
1024 sattr->mattr.attr.mode = S_IRUGO;
1025 *(gattr++) = &(sattr++)->mattr.attr;
1029 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1032 mod->sect_attrs = sect_attrs;
1035 free_sect_attrs(sect_attrs);
1038 static void remove_sect_attrs(struct module *mod)
1040 if (mod->sect_attrs) {
1041 sysfs_remove_group(&mod->mkobj.kobj,
1042 &mod->sect_attrs->grp);
1043 /* We are positive that no one is using any sect attrs
1044 * at this point. Deallocate immediately. */
1045 free_sect_attrs(mod->sect_attrs);
1046 mod->sect_attrs = NULL;
1052 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1053 char *sectstrings, Elf_Shdr *sechdrs)
1057 static inline void remove_sect_attrs(struct module *mod)
1060 #endif /* CONFIG_KALLSYMS */
1063 int module_add_modinfo_attrs(struct module *mod)
1065 struct module_attribute *attr;
1066 struct module_attribute *temp_attr;
1070 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1071 (ARRAY_SIZE(modinfo_attrs) + 1)),
1073 if (!mod->modinfo_attrs)
1076 temp_attr = mod->modinfo_attrs;
1077 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1079 (attr->test && attr->test(mod))) {
1080 memcpy(temp_attr, attr, sizeof(*temp_attr));
1081 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1088 void module_remove_modinfo_attrs(struct module *mod)
1090 struct module_attribute *attr;
1093 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1094 /* pick a field to test for end of list */
1095 if (!attr->attr.name)
1097 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1101 kfree(mod->modinfo_attrs);
1106 int mod_sysfs_init(struct module *mod)
1110 if (!module_sysfs_initialized) {
1111 printk(KERN_ERR "%s: module sysfs not initialized\n",
1116 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1117 err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
1120 kobj_set_kset_s(&mod->mkobj, module_subsys);
1121 mod->mkobj.mod = mod;
1123 kobject_init(&mod->mkobj.kobj);
1129 int mod_sysfs_setup(struct module *mod,
1130 struct kernel_param *kparam,
1131 unsigned int num_params)
1135 /* delay uevent until full sysfs population */
1136 err = kobject_add(&mod->mkobj.kobj);
1140 mod->holders_dir = kobject_add_dir(&mod->mkobj.kobj, "holders");
1141 if (!mod->holders_dir) {
1146 err = module_param_sysfs_setup(mod, kparam, num_params);
1148 goto out_unreg_holders;
1150 err = module_add_modinfo_attrs(mod);
1152 goto out_unreg_param;
1154 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1158 module_param_sysfs_remove(mod);
1160 kobject_unregister(mod->holders_dir);
1162 kobject_del(&mod->mkobj.kobj);
1163 kobject_put(&mod->mkobj.kobj);
1169 static void mod_kobject_remove(struct module *mod)
1171 module_remove_modinfo_attrs(mod);
1172 module_param_sysfs_remove(mod);
1173 kobject_unregister(mod->mkobj.drivers_dir);
1174 kobject_unregister(mod->holders_dir);
1175 kobject_unregister(&mod->mkobj.kobj);
1179 * unlink the module with the whole machine is stopped with interrupts off
1180 * - this defends against kallsyms not taking locks
1182 static int __unlink_module(void *_mod)
1184 struct module *mod = _mod;
1185 list_del(&mod->list);
1189 /* Free a module, remove from lists, etc (must hold module_mutex). */
1190 static void free_module(struct module *mod)
1192 /* Delete from various lists */
1193 stop_machine_run(__unlink_module, mod, NR_CPUS);
1194 remove_sect_attrs(mod);
1195 mod_kobject_remove(mod);
1197 unwind_remove_table(mod->unwind_info, 0);
1199 /* Arch-specific cleanup. */
1200 module_arch_cleanup(mod);
1202 /* Module unload stuff */
1203 module_unload_free(mod);
1205 /* This may be NULL, but that's OK */
1206 module_free(mod, mod->module_init);
1209 percpu_modfree(mod->percpu);
1211 /* Free lock-classes: */
1212 lockdep_free_key_range(mod->module_core, mod->core_size);
1214 /* Finally, free the core (containing the module structure) */
1215 module_free(mod, mod->module_core);
1218 void *__symbol_get(const char *symbol)
1220 struct module *owner;
1221 unsigned long value;
1222 const unsigned long *crc;
1225 value = __find_symbol(symbol, &owner, &crc, 1);
1226 if (value && !strong_try_module_get(owner))
1230 return (void *)value;
1232 EXPORT_SYMBOL_GPL(__symbol_get);
1235 * Ensure that an exported symbol [global namespace] does not already exist
1236 * in the kernel or in some other module's exported symbol table.
1238 static int verify_export_symbols(struct module *mod)
1240 const char *name = NULL;
1241 unsigned long i, ret = 0;
1242 struct module *owner;
1243 const unsigned long *crc;
1245 for (i = 0; i < mod->num_syms; i++)
1246 if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
1247 name = mod->syms[i].name;
1252 for (i = 0; i < mod->num_gpl_syms; i++)
1253 if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
1254 name = mod->gpl_syms[i].name;
1261 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1262 mod->name, name, module_name(owner));
1267 /* Change all symbols so that sh_value encodes the pointer directly. */
1268 static int simplify_symbols(Elf_Shdr *sechdrs,
1269 unsigned int symindex,
1271 unsigned int versindex,
1272 unsigned int pcpuindex,
1275 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1276 unsigned long secbase;
1277 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1280 for (i = 1; i < n; i++) {
1281 switch (sym[i].st_shndx) {
1283 /* We compiled with -fno-common. These are not
1284 supposed to happen. */
1285 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1286 printk("%s: please compile with -fno-common\n",
1292 /* Don't need to do anything */
1293 DEBUGP("Absolute symbol: 0x%08lx\n",
1294 (long)sym[i].st_value);
1299 = resolve_symbol(sechdrs, versindex,
1300 strtab + sym[i].st_name, mod);
1302 /* Ok if resolved. */
1303 if (sym[i].st_value != 0)
1306 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1309 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1310 mod->name, strtab + sym[i].st_name);
1315 /* Divert to percpu allocation if a percpu var. */
1316 if (sym[i].st_shndx == pcpuindex)
1317 secbase = (unsigned long)mod->percpu;
1319 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1320 sym[i].st_value += secbase;
1328 /* Update size with this section: return offset. */
1329 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1333 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1334 *size = ret + sechdr->sh_size;
1338 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1339 might -- code, read-only data, read-write data, small data. Tally
1340 sizes, and place the offsets into sh_entsize fields: high bit means it
1342 static void layout_sections(struct module *mod,
1343 const Elf_Ehdr *hdr,
1345 const char *secstrings)
1347 static unsigned long const masks[][2] = {
1348 /* NOTE: all executable code must be the first section
1349 * in this array; otherwise modify the text_size
1350 * finder in the two loops below */
1351 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1352 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1353 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1354 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1358 for (i = 0; i < hdr->e_shnum; i++)
1359 sechdrs[i].sh_entsize = ~0UL;
1361 DEBUGP("Core section allocation order:\n");
1362 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1363 for (i = 0; i < hdr->e_shnum; ++i) {
1364 Elf_Shdr *s = &sechdrs[i];
1366 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1367 || (s->sh_flags & masks[m][1])
1368 || s->sh_entsize != ~0UL
1369 || strncmp(secstrings + s->sh_name,
1372 s->sh_entsize = get_offset(&mod->core_size, s);
1373 DEBUGP("\t%s\n", secstrings + s->sh_name);
1376 mod->core_text_size = mod->core_size;
1379 DEBUGP("Init section allocation order:\n");
1380 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1381 for (i = 0; i < hdr->e_shnum; ++i) {
1382 Elf_Shdr *s = &sechdrs[i];
1384 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1385 || (s->sh_flags & masks[m][1])
1386 || s->sh_entsize != ~0UL
1387 || strncmp(secstrings + s->sh_name,
1390 s->sh_entsize = (get_offset(&mod->init_size, s)
1391 | INIT_OFFSET_MASK);
1392 DEBUGP("\t%s\n", secstrings + s->sh_name);
1395 mod->init_text_size = mod->init_size;
1399 static void set_license(struct module *mod, const char *license)
1402 license = "unspecified";
1404 if (!license_is_gpl_compatible(license)) {
1405 if (!(tainted & TAINT_PROPRIETARY_MODULE))
1406 printk(KERN_WARNING "%s: module license '%s' taints "
1407 "kernel.\n", mod->name, license);
1408 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1412 /* Parse tag=value strings from .modinfo section */
1413 static char *next_string(char *string, unsigned long *secsize)
1415 /* Skip non-zero chars */
1418 if ((*secsize)-- <= 1)
1422 /* Skip any zero padding. */
1423 while (!string[0]) {
1425 if ((*secsize)-- <= 1)
1431 static char *get_modinfo(Elf_Shdr *sechdrs,
1436 unsigned int taglen = strlen(tag);
1437 unsigned long size = sechdrs[info].sh_size;
1439 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1440 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1441 return p + taglen + 1;
1446 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1447 unsigned int infoindex)
1449 struct module_attribute *attr;
1452 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1455 get_modinfo(sechdrs,
1461 #ifdef CONFIG_KALLSYMS
1462 static int is_exported(const char *name, const struct module *mod)
1464 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1467 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1474 static char elf_type(const Elf_Sym *sym,
1476 const char *secstrings,
1479 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1480 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1485 if (sym->st_shndx == SHN_UNDEF)
1487 if (sym->st_shndx == SHN_ABS)
1489 if (sym->st_shndx >= SHN_LORESERVE)
1491 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1493 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1494 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1495 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1497 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1502 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1503 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1508 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1509 ".debug", strlen(".debug")) == 0)
1514 static void add_kallsyms(struct module *mod,
1516 unsigned int symindex,
1517 unsigned int strindex,
1518 const char *secstrings)
1522 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1523 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1524 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1526 /* Set types up while we still have access to sections. */
1527 for (i = 0; i < mod->num_symtab; i++)
1528 mod->symtab[i].st_info
1529 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1532 static inline void add_kallsyms(struct module *mod,
1534 unsigned int symindex,
1535 unsigned int strindex,
1536 const char *secstrings)
1539 #endif /* CONFIG_KALLSYMS */
1541 /* Allocate and load the module: note that size of section 0 is always
1542 zero, and we rely on this for optional sections. */
1543 static struct module *load_module(void __user *umod,
1545 const char __user *uargs)
1549 char *secstrings, *args, *modmagic, *strtab = NULL;
1551 unsigned int symindex = 0;
1552 unsigned int strindex = 0;
1553 unsigned int setupindex;
1554 unsigned int exindex;
1555 unsigned int exportindex;
1556 unsigned int modindex;
1557 unsigned int obsparmindex;
1558 unsigned int infoindex;
1559 unsigned int gplindex;
1560 unsigned int crcindex;
1561 unsigned int gplcrcindex;
1562 unsigned int versindex;
1563 unsigned int pcpuindex;
1564 unsigned int gplfutureindex;
1565 unsigned int gplfuturecrcindex;
1566 unsigned int unwindex = 0;
1567 unsigned int unusedindex;
1568 unsigned int unusedcrcindex;
1569 unsigned int unusedgplindex;
1570 unsigned int unusedgplcrcindex;
1573 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1574 struct exception_table_entry *extable;
1575 mm_segment_t old_fs;
1577 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1579 if (len < sizeof(*hdr))
1580 return ERR_PTR(-ENOEXEC);
1582 /* Suck in entire file: we'll want most of it. */
1583 /* vmalloc barfs on "unusual" numbers. Check here */
1584 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1585 return ERR_PTR(-ENOMEM);
1586 if (copy_from_user(hdr, umod, len) != 0) {
1591 /* Sanity checks against insmoding binaries or wrong arch,
1592 weird elf version */
1593 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1594 || hdr->e_type != ET_REL
1595 || !elf_check_arch(hdr)
1596 || hdr->e_shentsize != sizeof(*sechdrs)) {
1601 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1604 /* Convenience variables */
1605 sechdrs = (void *)hdr + hdr->e_shoff;
1606 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1607 sechdrs[0].sh_addr = 0;
1609 for (i = 1; i < hdr->e_shnum; i++) {
1610 if (sechdrs[i].sh_type != SHT_NOBITS
1611 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1614 /* Mark all sections sh_addr with their address in the
1616 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1618 /* Internal symbols and strings. */
1619 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1621 strindex = sechdrs[i].sh_link;
1622 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1624 #ifndef CONFIG_MODULE_UNLOAD
1625 /* Don't load .exit sections */
1626 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1627 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1631 modindex = find_sec(hdr, sechdrs, secstrings,
1632 ".gnu.linkonce.this_module");
1634 printk(KERN_WARNING "No module found in object\n");
1638 mod = (void *)sechdrs[modindex].sh_addr;
1640 if (symindex == 0) {
1641 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1647 /* Optional sections */
1648 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1649 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1650 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1651 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1652 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
1653 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1654 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1655 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1656 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1657 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
1658 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1659 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1660 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1661 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1662 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1663 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1664 #ifdef ARCH_UNWIND_SECTION_NAME
1665 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1668 /* Don't keep modinfo section */
1669 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1670 #ifdef CONFIG_KALLSYMS
1671 /* Keep symbol and string tables for decoding later. */
1672 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1673 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1676 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1678 /* Check module struct version now, before we try to use module. */
1679 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1684 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1685 /* This is allowed: modprobe --force will invalidate it. */
1687 add_taint_module(mod, TAINT_FORCED_MODULE);
1688 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1690 } else if (!same_magic(modmagic, vermagic)) {
1691 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1692 mod->name, modmagic, vermagic);
1697 /* Now copy in args */
1698 args = strndup_user(uargs, ~0UL >> 1);
1700 err = PTR_ERR(args);
1704 if (find_module(mod->name)) {
1709 mod->state = MODULE_STATE_COMING;
1711 /* Allow arches to frob section contents and sizes. */
1712 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1717 /* We have a special allocation for this section. */
1718 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1719 sechdrs[pcpuindex].sh_addralign,
1725 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1726 mod->percpu = percpu;
1729 /* Determine total sizes, and put offsets in sh_entsize. For now
1730 this is done generically; there doesn't appear to be any
1731 special cases for the architectures. */
1732 layout_sections(mod, hdr, sechdrs, secstrings);
1734 /* Do the allocs. */
1735 ptr = module_alloc(mod->core_size);
1740 memset(ptr, 0, mod->core_size);
1741 mod->module_core = ptr;
1743 ptr = module_alloc(mod->init_size);
1744 if (!ptr && mod->init_size) {
1748 memset(ptr, 0, mod->init_size);
1749 mod->module_init = ptr;
1751 /* Transfer each section which specifies SHF_ALLOC */
1752 DEBUGP("final section addresses:\n");
1753 for (i = 0; i < hdr->e_shnum; i++) {
1756 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1759 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1760 dest = mod->module_init
1761 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1763 dest = mod->module_core + sechdrs[i].sh_entsize;
1765 if (sechdrs[i].sh_type != SHT_NOBITS)
1766 memcpy(dest, (void *)sechdrs[i].sh_addr,
1767 sechdrs[i].sh_size);
1768 /* Update sh_addr to point to copy in image. */
1769 sechdrs[i].sh_addr = (unsigned long)dest;
1770 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1772 /* Module has been moved. */
1773 mod = (void *)sechdrs[modindex].sh_addr;
1775 /* Now we've moved module, initialize linked lists, etc. */
1776 module_unload_init(mod);
1778 /* Initialize kobject, so we can reference it. */
1779 if (mod_sysfs_init(mod) != 0)
1782 /* Set up license info based on the info section */
1783 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1785 if (strcmp(mod->name, "ndiswrapper") == 0)
1786 add_taint(TAINT_PROPRIETARY_MODULE);
1787 if (strcmp(mod->name, "driverloader") == 0)
1788 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1790 /* Set up MODINFO_ATTR fields */
1791 setup_modinfo(mod, sechdrs, infoindex);
1793 /* Fix up syms, so that st_value is a pointer to location. */
1794 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1799 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1800 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1801 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1803 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1804 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1805 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1807 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1808 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1809 sizeof(*mod->gpl_future_syms);
1810 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
1811 sizeof(*mod->unused_syms);
1812 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
1813 sizeof(*mod->unused_gpl_syms);
1814 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1815 if (gplfuturecrcindex)
1816 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
1818 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
1820 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
1821 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
1822 if (unusedgplcrcindex)
1823 mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
1825 #ifdef CONFIG_MODVERSIONS
1826 if ((mod->num_syms && !crcindex) ||
1827 (mod->num_gpl_syms && !gplcrcindex) ||
1828 (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
1829 (mod->num_unused_syms && !unusedcrcindex) ||
1830 (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
1831 printk(KERN_WARNING "%s: No versions for exported symbols."
1832 " Tainting kernel.\n", mod->name);
1833 add_taint_module(mod, TAINT_FORCED_MODULE);
1837 /* Now do relocations. */
1838 for (i = 1; i < hdr->e_shnum; i++) {
1839 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1840 unsigned int info = sechdrs[i].sh_info;
1842 /* Not a valid relocation section? */
1843 if (info >= hdr->e_shnum)
1846 /* Don't bother with non-allocated sections */
1847 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1850 if (sechdrs[i].sh_type == SHT_REL)
1851 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1852 else if (sechdrs[i].sh_type == SHT_RELA)
1853 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1859 /* Find duplicate symbols */
1860 err = verify_export_symbols(mod);
1865 /* Set up and sort exception table */
1866 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1867 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1868 sort_extable(extable, extable + mod->num_exentries);
1870 /* Finally, copy percpu area over. */
1871 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
1872 sechdrs[pcpuindex].sh_size);
1874 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
1876 err = module_finalize(hdr, sechdrs, mod);
1880 /* flush the icache in correct context */
1885 * Flush the instruction cache, since we've played with text.
1886 * Do it before processing of module parameters, so the module
1887 * can provide parameter accessor functions of its own.
1889 if (mod->module_init)
1890 flush_icache_range((unsigned long)mod->module_init,
1891 (unsigned long)mod->module_init
1893 flush_icache_range((unsigned long)mod->module_core,
1894 (unsigned long)mod->module_core + mod->core_size);
1900 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
1903 /* Size of section 0 is 0, so this works well if no params */
1904 err = parse_args(mod->name, mod->args,
1905 (struct kernel_param *)
1906 sechdrs[setupindex].sh_addr,
1907 sechdrs[setupindex].sh_size
1908 / sizeof(struct kernel_param),
1913 err = mod_sysfs_setup(mod,
1914 (struct kernel_param *)
1915 sechdrs[setupindex].sh_addr,
1916 sechdrs[setupindex].sh_size
1917 / sizeof(struct kernel_param));
1920 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
1922 /* Size of section 0 is 0, so this works well if no unwind info. */
1923 mod->unwind_info = unwind_add_table(mod,
1924 (void *)sechdrs[unwindex].sh_addr,
1925 sechdrs[unwindex].sh_size);
1927 /* Get rid of temporary copy */
1934 module_arch_cleanup(mod);
1936 module_unload_free(mod);
1937 module_free(mod, mod->module_init);
1939 module_free(mod, mod->module_core);
1942 percpu_modfree(percpu);
1947 return ERR_PTR(err);
1950 printk(KERN_ERR "Module len %lu truncated\n", len);
1956 * link the module with the whole machine is stopped with interrupts off
1957 * - this defends against kallsyms not taking locks
1959 static int __link_module(void *_mod)
1961 struct module *mod = _mod;
1962 list_add(&mod->list, &modules);
1966 /* This is where the real work happens */
1968 sys_init_module(void __user *umod,
1970 const char __user *uargs)
1975 /* Must have permission */
1976 if (!capable(CAP_SYS_MODULE))
1979 /* Only one module load at a time, please */
1980 if (mutex_lock_interruptible(&module_mutex) != 0)
1983 /* Do all the hard work */
1984 mod = load_module(umod, len, uargs);
1986 mutex_unlock(&module_mutex);
1987 return PTR_ERR(mod);
1990 /* Now sew it into the lists. They won't access us, since
1991 strong_try_module_get() will fail. */
1992 stop_machine_run(__link_module, mod, NR_CPUS);
1994 /* Drop lock so they can recurse */
1995 mutex_unlock(&module_mutex);
1997 blocking_notifier_call_chain(&module_notify_list,
1998 MODULE_STATE_COMING, mod);
2000 /* Start the module */
2001 if (mod->init != NULL)
2004 /* Init routine failed: abort. Try to protect us from
2005 buggy refcounters. */
2006 mod->state = MODULE_STATE_GOING;
2007 synchronize_sched();
2009 mutex_lock(&module_mutex);
2011 mutex_unlock(&module_mutex);
2015 /* Now it's a first class citizen! */
2016 mutex_lock(&module_mutex);
2017 mod->state = MODULE_STATE_LIVE;
2018 /* Drop initial reference. */
2020 unwind_remove_table(mod->unwind_info, 1);
2021 module_free(mod, mod->module_init);
2022 mod->module_init = NULL;
2024 mod->init_text_size = 0;
2025 mutex_unlock(&module_mutex);
2030 static inline int within(unsigned long addr, void *start, unsigned long size)
2032 return ((void *)addr >= start && (void *)addr < start + size);
2035 #ifdef CONFIG_KALLSYMS
2037 * This ignores the intensely annoying "mapping symbols" found
2038 * in ARM ELF files: $a, $t and $d.
2040 static inline int is_arm_mapping_symbol(const char *str)
2042 return str[0] == '$' && strchr("atd", str[1])
2043 && (str[2] == '\0' || str[2] == '.');
2046 static const char *get_ksymbol(struct module *mod,
2048 unsigned long *size,
2049 unsigned long *offset)
2051 unsigned int i, best = 0;
2052 unsigned long nextval;
2054 /* At worse, next value is at end of module */
2055 if (within(addr, mod->module_init, mod->init_size))
2056 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2058 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2060 /* Scan for closest preceeding symbol, and next symbol. (ELF
2061 starts real symbols at 1). */
2062 for (i = 1; i < mod->num_symtab; i++) {
2063 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2066 /* We ignore unnamed symbols: they're uninformative
2067 * and inserted at a whim. */
2068 if (mod->symtab[i].st_value <= addr
2069 && mod->symtab[i].st_value > mod->symtab[best].st_value
2070 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2071 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2073 if (mod->symtab[i].st_value > addr
2074 && mod->symtab[i].st_value < nextval
2075 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2076 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2077 nextval = mod->symtab[i].st_value;
2084 *size = nextval - mod->symtab[best].st_value;
2086 *offset = addr - mod->symtab[best].st_value;
2087 return mod->strtab + mod->symtab[best].st_name;
2090 /* For kallsyms to ask for address resolution. NULL means not found.
2091 We don't lock, as this is used for oops resolution and races are a
2093 const char *module_address_lookup(unsigned long addr,
2094 unsigned long *size,
2095 unsigned long *offset,
2100 list_for_each_entry(mod, &modules, list) {
2101 if (within(addr, mod->module_init, mod->init_size)
2102 || within(addr, mod->module_core, mod->core_size)) {
2104 *modname = mod->name;
2105 return get_ksymbol(mod, addr, size, offset);
2111 int lookup_module_symbol_name(unsigned long addr, char *symname)
2115 mutex_lock(&module_mutex);
2116 list_for_each_entry(mod, &modules, list) {
2117 if (within(addr, mod->module_init, mod->init_size) ||
2118 within(addr, mod->module_core, mod->core_size)) {
2121 sym = get_ksymbol(mod, addr, NULL, NULL);
2124 strlcpy(symname, sym, KSYM_NAME_LEN);
2125 mutex_unlock(&module_mutex);
2130 mutex_unlock(&module_mutex);
2134 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2135 unsigned long *offset, char *modname, char *name)
2139 mutex_lock(&module_mutex);
2140 list_for_each_entry(mod, &modules, list) {
2141 if (within(addr, mod->module_init, mod->init_size) ||
2142 within(addr, mod->module_core, mod->core_size)) {
2145 sym = get_ksymbol(mod, addr, size, offset);
2149 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2151 strlcpy(name, sym, KSYM_NAME_LEN);
2152 mutex_unlock(&module_mutex);
2157 mutex_unlock(&module_mutex);
2161 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2162 char *name, char *module_name, int *exported)
2166 mutex_lock(&module_mutex);
2167 list_for_each_entry(mod, &modules, list) {
2168 if (symnum < mod->num_symtab) {
2169 *value = mod->symtab[symnum].st_value;
2170 *type = mod->symtab[symnum].st_info;
2171 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2173 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2174 *exported = is_exported(name, mod);
2175 mutex_unlock(&module_mutex);
2178 symnum -= mod->num_symtab;
2180 mutex_unlock(&module_mutex);
2184 static unsigned long mod_find_symname(struct module *mod, const char *name)
2188 for (i = 0; i < mod->num_symtab; i++)
2189 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2190 mod->symtab[i].st_info != 'U')
2191 return mod->symtab[i].st_value;
2195 /* Look for this name: can be of form module:name. */
2196 unsigned long module_kallsyms_lookup_name(const char *name)
2200 unsigned long ret = 0;
2202 /* Don't lock: we're in enough trouble already. */
2203 if ((colon = strchr(name, ':')) != NULL) {
2205 if ((mod = find_module(name)) != NULL)
2206 ret = mod_find_symname(mod, colon+1);
2209 list_for_each_entry(mod, &modules, list)
2210 if ((ret = mod_find_symname(mod, name)) != 0)
2215 #endif /* CONFIG_KALLSYMS */
2217 /* Called by the /proc file system to return a list of modules. */
2218 static void *m_start(struct seq_file *m, loff_t *pos)
2220 mutex_lock(&module_mutex);
2221 return seq_list_start(&modules, *pos);
2224 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2226 return seq_list_next(p, &modules, pos);
2229 static void m_stop(struct seq_file *m, void *p)
2231 mutex_unlock(&module_mutex);
2234 static char *taint_flags(unsigned int taints, char *buf)
2240 if (taints & TAINT_PROPRIETARY_MODULE)
2242 if (taints & TAINT_FORCED_MODULE)
2245 * TAINT_FORCED_RMMOD: could be added.
2246 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2256 static int m_show(struct seq_file *m, void *p)
2258 struct module *mod = list_entry(p, struct module, list);
2261 seq_printf(m, "%s %lu",
2262 mod->name, mod->init_size + mod->core_size);
2263 print_unload_info(m, mod);
2265 /* Informative for users. */
2266 seq_printf(m, " %s",
2267 mod->state == MODULE_STATE_GOING ? "Unloading":
2268 mod->state == MODULE_STATE_COMING ? "Loading":
2270 /* Used by oprofile and other similar tools. */
2271 seq_printf(m, " 0x%p", mod->module_core);
2275 seq_printf(m, " %s", taint_flags(mod->taints, buf));
2277 seq_printf(m, "\n");
2281 /* Format: modulename size refcount deps address
2283 Where refcount is a number or -, and deps is a comma-separated list
2286 const struct seq_operations modules_op = {
2293 /* Given an address, look for it in the module exception tables. */
2294 const struct exception_table_entry *search_module_extables(unsigned long addr)
2296 const struct exception_table_entry *e = NULL;
2300 list_for_each_entry(mod, &modules, list) {
2301 if (mod->num_exentries == 0)
2304 e = search_extable(mod->extable,
2305 mod->extable + mod->num_exentries - 1,
2312 /* Now, if we found one, we are running inside it now, hence
2313 we cannot unload the module, hence no refcnt needed. */
2318 * Is this a valid module address?
2320 int is_module_address(unsigned long addr)
2326 list_for_each_entry(mod, &modules, list) {
2327 if (within(addr, mod->module_core, mod->core_size)) {
2339 /* Is this a valid kernel address? */
2340 struct module *__module_text_address(unsigned long addr)
2344 list_for_each_entry(mod, &modules, list)
2345 if (within(addr, mod->module_init, mod->init_text_size)
2346 || within(addr, mod->module_core, mod->core_text_size))
2351 struct module *module_text_address(unsigned long addr)
2356 mod = __module_text_address(addr);
2362 /* Don't grab lock, we're oopsing. */
2363 void print_modules(void)
2368 printk("Modules linked in:");
2369 list_for_each_entry(mod, &modules, list)
2370 printk(" %s%s", mod->name, taint_flags(mod->taints, buf));
2375 static char *make_driver_name(struct device_driver *drv)
2379 driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2,
2384 sprintf(driver_name, "%s:%s", drv->bus->name, drv->name);
2388 static void module_create_drivers_dir(struct module_kobject *mk)
2390 if (!mk || mk->drivers_dir)
2393 mk->drivers_dir = kobject_add_dir(&mk->kobj, "drivers");
2396 void module_add_driver(struct module *mod, struct device_driver *drv)
2400 struct module_kobject *mk = NULL;
2407 else if (drv->mod_name) {
2408 struct kobject *mkobj;
2410 /* Lookup built-in module entry in /sys/modules */
2411 mkobj = kset_find_obj(&module_subsys, drv->mod_name);
2413 mk = container_of(mkobj, struct module_kobject, kobj);
2414 /* remember our module structure */
2416 /* kset_find_obj took a reference */
2424 /* Don't check return codes; these calls are idempotent */
2425 no_warn = sysfs_create_link(&drv->kobj, &mk->kobj, "module");
2426 driver_name = make_driver_name(drv);
2428 module_create_drivers_dir(mk);
2429 no_warn = sysfs_create_link(mk->drivers_dir, &drv->kobj,
2434 EXPORT_SYMBOL(module_add_driver);
2436 void module_remove_driver(struct device_driver *drv)
2438 struct module_kobject *mk = NULL;
2444 sysfs_remove_link(&drv->kobj, "module");
2447 mk = &drv->owner->mkobj;
2448 else if (drv->mkobj)
2450 if (mk && mk->drivers_dir) {
2451 driver_name = make_driver_name(drv);
2453 sysfs_remove_link(mk->drivers_dir, driver_name);
2458 EXPORT_SYMBOL(module_remove_driver);
2461 #ifdef CONFIG_MODVERSIONS
2462 /* Generate the signature for struct module here, too, for modversions. */
2463 void struct_module(struct module *mod) { return; }
2464 EXPORT_SYMBOL(struct_module);