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 void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
437 for_each_possible_cpu(cpu)
438 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
441 static int percpu_modinit(void)
444 pcpu_num_allocated = 2;
445 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
447 /* Static in-kernel percpu data (used). */
448 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
450 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
451 if (pcpu_size[1] < 0) {
452 printk(KERN_ERR "No per-cpu room for modules.\n");
458 __initcall(percpu_modinit);
459 #else /* ... !CONFIG_SMP */
460 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
465 static inline void percpu_modfree(void *pcpuptr)
469 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
471 const char *secstrings)
475 static inline void percpu_modcopy(void *pcpudst, const void *src,
478 /* pcpusec should be 0, and size of that section should be 0. */
481 #endif /* CONFIG_SMP */
483 #define MODINFO_ATTR(field) \
484 static void setup_modinfo_##field(struct module *mod, const char *s) \
486 mod->field = kstrdup(s, GFP_KERNEL); \
488 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
489 struct module *mod, char *buffer) \
491 return sprintf(buffer, "%s\n", mod->field); \
493 static int modinfo_##field##_exists(struct module *mod) \
495 return mod->field != NULL; \
497 static void free_modinfo_##field(struct module *mod) \
502 static struct module_attribute modinfo_##field = { \
503 .attr = { .name = __stringify(field), .mode = 0444 }, \
504 .show = show_modinfo_##field, \
505 .setup = setup_modinfo_##field, \
506 .test = modinfo_##field##_exists, \
507 .free = free_modinfo_##field, \
510 MODINFO_ATTR(version);
511 MODINFO_ATTR(srcversion);
513 static char last_unloaded_module[MODULE_NAME_LEN+1];
515 #ifdef CONFIG_MODULE_UNLOAD
516 /* Init the unload section of the module. */
517 static void module_unload_init(struct module *mod)
521 INIT_LIST_HEAD(&mod->modules_which_use_me);
522 for (i = 0; i < NR_CPUS; i++)
523 local_set(&mod->ref[i].count, 0);
524 /* Hold reference count during initialization. */
525 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
526 /* Backwards compatibility macros put refcount during init. */
527 mod->waiter = current;
530 /* modules using other modules */
533 struct list_head list;
534 struct module *module_which_uses;
537 /* Does a already use b? */
538 static int already_uses(struct module *a, struct module *b)
540 struct module_use *use;
542 list_for_each_entry(use, &b->modules_which_use_me, list) {
543 if (use->module_which_uses == a) {
544 DEBUGP("%s uses %s!\n", a->name, b->name);
548 DEBUGP("%s does not use %s!\n", a->name, b->name);
552 /* Module a uses b */
553 static int use_module(struct module *a, struct module *b)
555 struct module_use *use;
558 if (b == NULL || already_uses(a, b)) return 1;
560 /* If we're interrupted or time out, we fail. */
561 if (wait_event_interruptible_timeout(
562 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
564 printk("%s: gave up waiting for init of module %s.\n",
569 /* If strong_try_module_get() returned a different error, we fail. */
573 DEBUGP("Allocating new usage for %s.\n", a->name);
574 use = kmalloc(sizeof(*use), GFP_ATOMIC);
576 printk("%s: out of memory loading\n", a->name);
581 use->module_which_uses = a;
582 list_add(&use->list, &b->modules_which_use_me);
583 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
587 /* Clear the unload stuff of the module. */
588 static void module_unload_free(struct module *mod)
592 list_for_each_entry(i, &modules, list) {
593 struct module_use *use;
595 list_for_each_entry(use, &i->modules_which_use_me, list) {
596 if (use->module_which_uses == mod) {
597 DEBUGP("%s unusing %s\n", mod->name, i->name);
599 list_del(&use->list);
601 sysfs_remove_link(i->holders_dir, mod->name);
602 /* There can be at most one match. */
609 #ifdef CONFIG_MODULE_FORCE_UNLOAD
610 static inline int try_force_unload(unsigned int flags)
612 int ret = (flags & O_TRUNC);
614 add_taint(TAINT_FORCED_RMMOD);
618 static inline int try_force_unload(unsigned int flags)
622 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
631 /* Whole machine is stopped with interrupts off when this runs. */
632 static int __try_stop_module(void *_sref)
634 struct stopref *sref = _sref;
636 /* If it's not unused, quit unless we are told to block. */
637 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
638 if (!(*sref->forced = try_force_unload(sref->flags)))
642 /* Mark it as dying. */
643 sref->mod->state = MODULE_STATE_GOING;
647 static int try_stop_module(struct module *mod, int flags, int *forced)
649 struct stopref sref = { mod, flags, forced };
651 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
654 unsigned int module_refcount(struct module *mod)
656 unsigned int i, total = 0;
658 for (i = 0; i < NR_CPUS; i++)
659 total += local_read(&mod->ref[i].count);
662 EXPORT_SYMBOL(module_refcount);
664 /* This exists whether we can unload or not */
665 static void free_module(struct module *mod);
667 static void wait_for_zero_refcount(struct module *mod)
669 /* Since we might sleep for some time, drop the semaphore first */
670 mutex_unlock(&module_mutex);
672 DEBUGP("Looking at refcount...\n");
673 set_current_state(TASK_UNINTERRUPTIBLE);
674 if (module_refcount(mod) == 0)
678 current->state = TASK_RUNNING;
679 mutex_lock(&module_mutex);
683 sys_delete_module(const char __user *name_user, unsigned int flags)
686 char name[MODULE_NAME_LEN];
689 if (!capable(CAP_SYS_MODULE))
692 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
694 name[MODULE_NAME_LEN-1] = '\0';
696 if (mutex_lock_interruptible(&module_mutex) != 0)
699 mod = find_module(name);
705 if (!list_empty(&mod->modules_which_use_me)) {
706 /* Other modules depend on us: get rid of them first. */
711 /* Doing init or already dying? */
712 if (mod->state != MODULE_STATE_LIVE) {
713 /* FIXME: if (force), slam module count and wake up
715 DEBUGP("%s already dying\n", mod->name);
720 /* If it has an init func, it must have an exit func to unload */
721 if (mod->init && !mod->exit) {
722 forced = try_force_unload(flags);
724 /* This module can't be removed */
730 /* Set this up before setting mod->state */
731 mod->waiter = current;
733 /* Stop the machine so refcounts can't move and disable module. */
734 ret = try_stop_module(mod, flags, &forced);
738 /* Never wait if forced. */
739 if (!forced && module_refcount(mod) != 0)
740 wait_for_zero_refcount(mod);
742 /* Final destruction now noone is using it. */
743 if (mod->exit != NULL) {
744 mutex_unlock(&module_mutex);
746 mutex_lock(&module_mutex);
748 /* Store the name of the last unloaded module for diagnostic purposes */
749 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
753 mutex_unlock(&module_mutex);
757 static void print_unload_info(struct seq_file *m, struct module *mod)
759 struct module_use *use;
760 int printed_something = 0;
762 seq_printf(m, " %u ", module_refcount(mod));
764 /* Always include a trailing , so userspace can differentiate
765 between this and the old multi-field proc format. */
766 list_for_each_entry(use, &mod->modules_which_use_me, list) {
767 printed_something = 1;
768 seq_printf(m, "%s,", use->module_which_uses->name);
771 if (mod->init != NULL && mod->exit == NULL) {
772 printed_something = 1;
773 seq_printf(m, "[permanent],");
776 if (!printed_something)
780 void __symbol_put(const char *symbol)
782 struct module *owner;
783 const unsigned long *crc;
786 if (IS_ERR_VALUE(__find_symbol(symbol, &owner, &crc, 1)))
791 EXPORT_SYMBOL(__symbol_put);
793 void symbol_put_addr(void *addr)
795 struct module *modaddr;
797 if (core_kernel_text((unsigned long)addr))
800 if (!(modaddr = module_text_address((unsigned long)addr)))
804 EXPORT_SYMBOL_GPL(symbol_put_addr);
806 static ssize_t show_refcnt(struct module_attribute *mattr,
807 struct module *mod, char *buffer)
809 return sprintf(buffer, "%u\n", module_refcount(mod));
812 static struct module_attribute refcnt = {
813 .attr = { .name = "refcnt", .mode = 0444 },
817 void module_put(struct module *module)
820 unsigned int cpu = get_cpu();
821 local_dec(&module->ref[cpu].count);
822 /* Maybe they're waiting for us to drop reference? */
823 if (unlikely(!module_is_live(module)))
824 wake_up_process(module->waiter);
828 EXPORT_SYMBOL(module_put);
830 #else /* !CONFIG_MODULE_UNLOAD */
831 static void print_unload_info(struct seq_file *m, struct module *mod)
833 /* We don't know the usage count, or what modules are using. */
834 seq_printf(m, " - -");
837 static inline void module_unload_free(struct module *mod)
841 static inline int use_module(struct module *a, struct module *b)
843 return strong_try_module_get(b) == 0;
846 static inline void module_unload_init(struct module *mod)
849 #endif /* CONFIG_MODULE_UNLOAD */
851 static ssize_t show_initstate(struct module_attribute *mattr,
852 struct module *mod, char *buffer)
854 const char *state = "unknown";
856 switch (mod->state) {
857 case MODULE_STATE_LIVE:
860 case MODULE_STATE_COMING:
863 case MODULE_STATE_GOING:
867 return sprintf(buffer, "%s\n", state);
870 static struct module_attribute initstate = {
871 .attr = { .name = "initstate", .mode = 0444 },
872 .show = show_initstate,
875 static struct module_attribute *modinfo_attrs[] = {
879 #ifdef CONFIG_MODULE_UNLOAD
885 static const char vermagic[] = VERMAGIC_STRING;
887 #ifdef CONFIG_MODVERSIONS
888 static int check_version(Elf_Shdr *sechdrs,
889 unsigned int versindex,
892 const unsigned long *crc)
894 unsigned int i, num_versions;
895 struct modversion_info *versions;
897 /* Exporting module didn't supply crcs? OK, we're already tainted. */
901 versions = (void *) sechdrs[versindex].sh_addr;
902 num_versions = sechdrs[versindex].sh_size
903 / sizeof(struct modversion_info);
905 for (i = 0; i < num_versions; i++) {
906 if (strcmp(versions[i].name, symname) != 0)
909 if (versions[i].crc == *crc)
911 printk("%s: disagrees about version of symbol %s\n",
913 DEBUGP("Found checksum %lX vs module %lX\n",
914 *crc, versions[i].crc);
917 /* Not in module's version table. OK, but that taints the kernel. */
918 if (!(tainted & TAINT_FORCED_MODULE))
919 printk("%s: no version for \"%s\" found: kernel tainted.\n",
921 add_taint_module(mod, TAINT_FORCED_MODULE);
925 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
926 unsigned int versindex,
929 const unsigned long *crc;
930 struct module *owner;
932 if (IS_ERR_VALUE(__find_symbol("struct_module",
935 return check_version(sechdrs, versindex, "struct_module", mod,
939 /* First part is kernel version, which we ignore. */
940 static inline int same_magic(const char *amagic, const char *bmagic)
942 amagic += strcspn(amagic, " ");
943 bmagic += strcspn(bmagic, " ");
944 return strcmp(amagic, bmagic) == 0;
947 static inline int check_version(Elf_Shdr *sechdrs,
948 unsigned int versindex,
951 const unsigned long *crc)
956 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
957 unsigned int versindex,
963 static inline int same_magic(const char *amagic, const char *bmagic)
965 return strcmp(amagic, bmagic) == 0;
967 #endif /* CONFIG_MODVERSIONS */
969 /* Resolve a symbol for this module. I.e. if we find one, record usage.
970 Must be holding module_mutex. */
971 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
972 unsigned int versindex,
976 struct module *owner;
978 const unsigned long *crc;
980 ret = __find_symbol(name, &owner, &crc,
981 !(mod->taints & TAINT_PROPRIETARY_MODULE));
982 if (!IS_ERR_VALUE(ret)) {
983 /* use_module can fail due to OOM,
984 or module initialization or unloading */
985 if (!check_version(sechdrs, versindex, name, mod, crc) ||
986 !use_module(mod, owner))
994 * /sys/module/foo/sections stuff
995 * J. Corbet <corbet@lwn.net>
997 #ifdef CONFIG_KALLSYMS
998 static ssize_t module_sect_show(struct module_attribute *mattr,
999 struct module *mod, char *buf)
1001 struct module_sect_attr *sattr =
1002 container_of(mattr, struct module_sect_attr, mattr);
1003 return sprintf(buf, "0x%lx\n", sattr->address);
1006 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1010 for (section = 0; section < sect_attrs->nsections; section++)
1011 kfree(sect_attrs->attrs[section].name);
1015 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1016 char *secstrings, Elf_Shdr *sechdrs)
1018 unsigned int nloaded = 0, i, size[2];
1019 struct module_sect_attrs *sect_attrs;
1020 struct module_sect_attr *sattr;
1021 struct attribute **gattr;
1023 /* Count loaded sections and allocate structures */
1024 for (i = 0; i < nsect; i++)
1025 if (sechdrs[i].sh_flags & SHF_ALLOC)
1027 size[0] = ALIGN(sizeof(*sect_attrs)
1028 + nloaded * sizeof(sect_attrs->attrs[0]),
1029 sizeof(sect_attrs->grp.attrs[0]));
1030 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1031 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1032 if (sect_attrs == NULL)
1035 /* Setup section attributes. */
1036 sect_attrs->grp.name = "sections";
1037 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1039 sect_attrs->nsections = 0;
1040 sattr = §_attrs->attrs[0];
1041 gattr = §_attrs->grp.attrs[0];
1042 for (i = 0; i < nsect; i++) {
1043 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1045 sattr->address = sechdrs[i].sh_addr;
1046 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1048 if (sattr->name == NULL)
1050 sect_attrs->nsections++;
1051 sattr->mattr.show = module_sect_show;
1052 sattr->mattr.store = NULL;
1053 sattr->mattr.attr.name = sattr->name;
1054 sattr->mattr.attr.mode = S_IRUGO;
1055 *(gattr++) = &(sattr++)->mattr.attr;
1059 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1062 mod->sect_attrs = sect_attrs;
1065 free_sect_attrs(sect_attrs);
1068 static void remove_sect_attrs(struct module *mod)
1070 if (mod->sect_attrs) {
1071 sysfs_remove_group(&mod->mkobj.kobj,
1072 &mod->sect_attrs->grp);
1073 /* We are positive that no one is using any sect attrs
1074 * at this point. Deallocate immediately. */
1075 free_sect_attrs(mod->sect_attrs);
1076 mod->sect_attrs = NULL;
1081 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1084 struct module_notes_attrs {
1085 struct kobject *dir;
1087 struct bin_attribute attrs[0];
1090 static ssize_t module_notes_read(struct kobject *kobj,
1091 struct bin_attribute *bin_attr,
1092 char *buf, loff_t pos, size_t count)
1095 * The caller checked the pos and count against our size.
1097 memcpy(buf, bin_attr->private + pos, count);
1101 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1104 if (notes_attrs->dir) {
1106 sysfs_remove_bin_file(notes_attrs->dir,
1107 ¬es_attrs->attrs[i]);
1108 kobject_del(notes_attrs->dir);
1113 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1114 char *secstrings, Elf_Shdr *sechdrs)
1116 unsigned int notes, loaded, i;
1117 struct module_notes_attrs *notes_attrs;
1118 struct bin_attribute *nattr;
1120 /* Count notes sections and allocate structures. */
1122 for (i = 0; i < nsect; i++)
1123 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1124 (sechdrs[i].sh_type == SHT_NOTE))
1130 notes_attrs = kzalloc(sizeof(*notes_attrs)
1131 + notes * sizeof(notes_attrs->attrs[0]),
1133 if (notes_attrs == NULL)
1136 notes_attrs->notes = notes;
1137 nattr = ¬es_attrs->attrs[0];
1138 for (loaded = i = 0; i < nsect; ++i) {
1139 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1141 if (sechdrs[i].sh_type == SHT_NOTE) {
1142 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1143 nattr->attr.mode = S_IRUGO;
1144 nattr->size = sechdrs[i].sh_size;
1145 nattr->private = (void *) sechdrs[i].sh_addr;
1146 nattr->read = module_notes_read;
1152 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1153 if (!notes_attrs->dir)
1156 for (i = 0; i < notes; ++i)
1157 if (sysfs_create_bin_file(notes_attrs->dir,
1158 ¬es_attrs->attrs[i]))
1161 mod->notes_attrs = notes_attrs;
1165 free_notes_attrs(notes_attrs, i);
1168 static void remove_notes_attrs(struct module *mod)
1170 if (mod->notes_attrs)
1171 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1176 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1177 char *sectstrings, Elf_Shdr *sechdrs)
1181 static inline void remove_sect_attrs(struct module *mod)
1185 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1186 char *sectstrings, Elf_Shdr *sechdrs)
1190 static inline void remove_notes_attrs(struct module *mod)
1193 #endif /* CONFIG_KALLSYMS */
1196 int module_add_modinfo_attrs(struct module *mod)
1198 struct module_attribute *attr;
1199 struct module_attribute *temp_attr;
1203 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1204 (ARRAY_SIZE(modinfo_attrs) + 1)),
1206 if (!mod->modinfo_attrs)
1209 temp_attr = mod->modinfo_attrs;
1210 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1212 (attr->test && attr->test(mod))) {
1213 memcpy(temp_attr, attr, sizeof(*temp_attr));
1214 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1221 void module_remove_modinfo_attrs(struct module *mod)
1223 struct module_attribute *attr;
1226 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1227 /* pick a field to test for end of list */
1228 if (!attr->attr.name)
1230 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1234 kfree(mod->modinfo_attrs);
1239 int mod_sysfs_init(struct module *mod)
1242 struct kobject *kobj;
1244 if (!module_sysfs_initialized) {
1245 printk(KERN_ERR "%s: module sysfs not initialized\n",
1251 kobj = kset_find_obj(module_kset, mod->name);
1253 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1259 mod->mkobj.mod = mod;
1261 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1262 mod->mkobj.kobj.kset = module_kset;
1263 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1266 kobject_put(&mod->mkobj.kobj);
1268 /* delay uevent until full sysfs population */
1273 int mod_sysfs_setup(struct module *mod,
1274 struct kernel_param *kparam,
1275 unsigned int num_params)
1279 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1280 if (!mod->holders_dir) {
1285 err = module_param_sysfs_setup(mod, kparam, num_params);
1287 goto out_unreg_holders;
1289 err = module_add_modinfo_attrs(mod);
1291 goto out_unreg_param;
1293 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1297 module_param_sysfs_remove(mod);
1299 kobject_put(mod->holders_dir);
1301 kobject_put(&mod->mkobj.kobj);
1306 static void mod_kobject_remove(struct module *mod)
1308 module_remove_modinfo_attrs(mod);
1309 module_param_sysfs_remove(mod);
1310 kobject_put(mod->mkobj.drivers_dir);
1311 kobject_put(mod->holders_dir);
1312 kobject_put(&mod->mkobj.kobj);
1316 * link the module with the whole machine is stopped with interrupts off
1317 * - this defends against kallsyms not taking locks
1319 static int __link_module(void *_mod)
1321 struct module *mod = _mod;
1322 list_add(&mod->list, &modules);
1327 * unlink the module with the whole machine is stopped with interrupts off
1328 * - this defends against kallsyms not taking locks
1330 static int __unlink_module(void *_mod)
1332 struct module *mod = _mod;
1333 list_del(&mod->list);
1337 /* Free a module, remove from lists, etc (must hold module_mutex). */
1338 static void free_module(struct module *mod)
1340 /* Delete from various lists */
1341 stop_machine_run(__unlink_module, mod, NR_CPUS);
1342 remove_notes_attrs(mod);
1343 remove_sect_attrs(mod);
1344 mod_kobject_remove(mod);
1346 unwind_remove_table(mod->unwind_info, 0);
1348 /* Arch-specific cleanup. */
1349 module_arch_cleanup(mod);
1351 /* Module unload stuff */
1352 module_unload_free(mod);
1354 /* This may be NULL, but that's OK */
1355 module_free(mod, mod->module_init);
1358 percpu_modfree(mod->percpu);
1360 /* Free lock-classes: */
1361 lockdep_free_key_range(mod->module_core, mod->core_size);
1363 /* Finally, free the core (containing the module structure) */
1364 module_free(mod, mod->module_core);
1367 void *__symbol_get(const char *symbol)
1369 struct module *owner;
1370 unsigned long value;
1371 const unsigned long *crc;
1374 value = __find_symbol(symbol, &owner, &crc, 1);
1375 if (IS_ERR_VALUE(value))
1377 else if (strong_try_module_get(owner))
1381 return (void *)value;
1383 EXPORT_SYMBOL_GPL(__symbol_get);
1386 * Ensure that an exported symbol [global namespace] does not already exist
1387 * in the kernel or in some other module's exported symbol table.
1389 static int verify_export_symbols(struct module *mod)
1391 const char *name = NULL;
1392 unsigned long i, ret = 0;
1393 struct module *owner;
1394 const unsigned long *crc;
1396 for (i = 0; i < mod->num_syms; i++)
1397 if (!IS_ERR_VALUE(__find_symbol(mod->syms[i].name,
1398 &owner, &crc, 1))) {
1399 name = mod->syms[i].name;
1404 for (i = 0; i < mod->num_gpl_syms; i++)
1405 if (!IS_ERR_VALUE(__find_symbol(mod->gpl_syms[i].name,
1406 &owner, &crc, 1))) {
1407 name = mod->gpl_syms[i].name;
1414 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1415 mod->name, name, module_name(owner));
1420 /* Change all symbols so that st_value encodes the pointer directly. */
1421 static int simplify_symbols(Elf_Shdr *sechdrs,
1422 unsigned int symindex,
1424 unsigned int versindex,
1425 unsigned int pcpuindex,
1428 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1429 unsigned long secbase;
1430 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1433 for (i = 1; i < n; i++) {
1434 switch (sym[i].st_shndx) {
1436 /* We compiled with -fno-common. These are not
1437 supposed to happen. */
1438 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1439 printk("%s: please compile with -fno-common\n",
1445 /* Don't need to do anything */
1446 DEBUGP("Absolute symbol: 0x%08lx\n",
1447 (long)sym[i].st_value);
1452 = resolve_symbol(sechdrs, versindex,
1453 strtab + sym[i].st_name, mod);
1455 /* Ok if resolved. */
1456 if (!IS_ERR_VALUE(sym[i].st_value))
1459 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1462 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1463 mod->name, strtab + sym[i].st_name);
1468 /* Divert to percpu allocation if a percpu var. */
1469 if (sym[i].st_shndx == pcpuindex)
1470 secbase = (unsigned long)mod->percpu;
1472 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1473 sym[i].st_value += secbase;
1481 /* Update size with this section: return offset. */
1482 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1486 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1487 *size = ret + sechdr->sh_size;
1491 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1492 might -- code, read-only data, read-write data, small data. Tally
1493 sizes, and place the offsets into sh_entsize fields: high bit means it
1495 static void layout_sections(struct module *mod,
1496 const Elf_Ehdr *hdr,
1498 const char *secstrings)
1500 static unsigned long const masks[][2] = {
1501 /* NOTE: all executable code must be the first section
1502 * in this array; otherwise modify the text_size
1503 * finder in the two loops below */
1504 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1505 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1506 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1507 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1511 for (i = 0; i < hdr->e_shnum; i++)
1512 sechdrs[i].sh_entsize = ~0UL;
1514 DEBUGP("Core section allocation order:\n");
1515 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1516 for (i = 0; i < hdr->e_shnum; ++i) {
1517 Elf_Shdr *s = &sechdrs[i];
1519 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1520 || (s->sh_flags & masks[m][1])
1521 || s->sh_entsize != ~0UL
1522 || strncmp(secstrings + s->sh_name,
1525 s->sh_entsize = get_offset(&mod->core_size, s);
1526 DEBUGP("\t%s\n", secstrings + s->sh_name);
1529 mod->core_text_size = mod->core_size;
1532 DEBUGP("Init section allocation order:\n");
1533 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1534 for (i = 0; i < hdr->e_shnum; ++i) {
1535 Elf_Shdr *s = &sechdrs[i];
1537 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1538 || (s->sh_flags & masks[m][1])
1539 || s->sh_entsize != ~0UL
1540 || strncmp(secstrings + s->sh_name,
1543 s->sh_entsize = (get_offset(&mod->init_size, s)
1544 | INIT_OFFSET_MASK);
1545 DEBUGP("\t%s\n", secstrings + s->sh_name);
1548 mod->init_text_size = mod->init_size;
1552 static void set_license(struct module *mod, const char *license)
1555 license = "unspecified";
1557 if (!license_is_gpl_compatible(license)) {
1558 if (!(tainted & TAINT_PROPRIETARY_MODULE))
1559 printk(KERN_WARNING "%s: module license '%s' taints "
1560 "kernel.\n", mod->name, license);
1561 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1565 /* Parse tag=value strings from .modinfo section */
1566 static char *next_string(char *string, unsigned long *secsize)
1568 /* Skip non-zero chars */
1571 if ((*secsize)-- <= 1)
1575 /* Skip any zero padding. */
1576 while (!string[0]) {
1578 if ((*secsize)-- <= 1)
1584 static char *get_modinfo(Elf_Shdr *sechdrs,
1589 unsigned int taglen = strlen(tag);
1590 unsigned long size = sechdrs[info].sh_size;
1592 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1593 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1594 return p + taglen + 1;
1599 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1600 unsigned int infoindex)
1602 struct module_attribute *attr;
1605 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1608 get_modinfo(sechdrs,
1614 #ifdef CONFIG_KALLSYMS
1615 static int is_exported(const char *name, const struct module *mod)
1617 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1620 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1627 static char elf_type(const Elf_Sym *sym,
1629 const char *secstrings,
1632 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1633 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1638 if (sym->st_shndx == SHN_UNDEF)
1640 if (sym->st_shndx == SHN_ABS)
1642 if (sym->st_shndx >= SHN_LORESERVE)
1644 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1646 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1647 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1648 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1650 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1655 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1656 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1661 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1662 ".debug", strlen(".debug")) == 0)
1667 static void add_kallsyms(struct module *mod,
1669 unsigned int symindex,
1670 unsigned int strindex,
1671 const char *secstrings)
1675 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1676 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1677 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1679 /* Set types up while we still have access to sections. */
1680 for (i = 0; i < mod->num_symtab; i++)
1681 mod->symtab[i].st_info
1682 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1685 static inline void add_kallsyms(struct module *mod,
1687 unsigned int symindex,
1688 unsigned int strindex,
1689 const char *secstrings)
1692 #endif /* CONFIG_KALLSYMS */
1694 /* Allocate and load the module: note that size of section 0 is always
1695 zero, and we rely on this for optional sections. */
1696 static struct module *load_module(void __user *umod,
1698 const char __user *uargs)
1702 char *secstrings, *args, *modmagic, *strtab = NULL;
1704 unsigned int symindex = 0;
1705 unsigned int strindex = 0;
1706 unsigned int setupindex;
1707 unsigned int exindex;
1708 unsigned int exportindex;
1709 unsigned int modindex;
1710 unsigned int obsparmindex;
1711 unsigned int infoindex;
1712 unsigned int gplindex;
1713 unsigned int crcindex;
1714 unsigned int gplcrcindex;
1715 unsigned int versindex;
1716 unsigned int pcpuindex;
1717 unsigned int gplfutureindex;
1718 unsigned int gplfuturecrcindex;
1719 unsigned int unwindex = 0;
1720 unsigned int unusedindex;
1721 unsigned int unusedcrcindex;
1722 unsigned int unusedgplindex;
1723 unsigned int unusedgplcrcindex;
1724 unsigned int markersindex;
1725 unsigned int markersstringsindex;
1728 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1729 struct exception_table_entry *extable;
1730 mm_segment_t old_fs;
1732 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1734 if (len < sizeof(*hdr))
1735 return ERR_PTR(-ENOEXEC);
1737 /* Suck in entire file: we'll want most of it. */
1738 /* vmalloc barfs on "unusual" numbers. Check here */
1739 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1740 return ERR_PTR(-ENOMEM);
1741 if (copy_from_user(hdr, umod, len) != 0) {
1746 /* Sanity checks against insmoding binaries or wrong arch,
1747 weird elf version */
1748 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1749 || hdr->e_type != ET_REL
1750 || !elf_check_arch(hdr)
1751 || hdr->e_shentsize != sizeof(*sechdrs)) {
1756 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1759 /* Convenience variables */
1760 sechdrs = (void *)hdr + hdr->e_shoff;
1761 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1762 sechdrs[0].sh_addr = 0;
1764 for (i = 1; i < hdr->e_shnum; i++) {
1765 if (sechdrs[i].sh_type != SHT_NOBITS
1766 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1769 /* Mark all sections sh_addr with their address in the
1771 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1773 /* Internal symbols and strings. */
1774 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1776 strindex = sechdrs[i].sh_link;
1777 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1779 #ifndef CONFIG_MODULE_UNLOAD
1780 /* Don't load .exit sections */
1781 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1782 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1786 modindex = find_sec(hdr, sechdrs, secstrings,
1787 ".gnu.linkonce.this_module");
1789 printk(KERN_WARNING "No module found in object\n");
1793 mod = (void *)sechdrs[modindex].sh_addr;
1795 if (symindex == 0) {
1796 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1802 /* Optional sections */
1803 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1804 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1805 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1806 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1807 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
1808 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1809 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1810 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1811 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1812 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
1813 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1814 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1815 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1816 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1817 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1818 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1819 #ifdef ARCH_UNWIND_SECTION_NAME
1820 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1823 /* Don't keep modinfo section */
1824 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1825 #ifdef CONFIG_KALLSYMS
1826 /* Keep symbol and string tables for decoding later. */
1827 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1828 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1831 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1833 /* Check module struct version now, before we try to use module. */
1834 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1839 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1840 /* This is allowed: modprobe --force will invalidate it. */
1842 add_taint_module(mod, TAINT_FORCED_MODULE);
1843 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1845 } else if (!same_magic(modmagic, vermagic)) {
1846 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1847 mod->name, modmagic, vermagic);
1852 /* Now copy in args */
1853 args = strndup_user(uargs, ~0UL >> 1);
1855 err = PTR_ERR(args);
1859 if (find_module(mod->name)) {
1864 mod->state = MODULE_STATE_COMING;
1866 /* Allow arches to frob section contents and sizes. */
1867 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1872 /* We have a special allocation for this section. */
1873 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1874 sechdrs[pcpuindex].sh_addralign,
1880 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1881 mod->percpu = percpu;
1884 /* Determine total sizes, and put offsets in sh_entsize. For now
1885 this is done generically; there doesn't appear to be any
1886 special cases for the architectures. */
1887 layout_sections(mod, hdr, sechdrs, secstrings);
1889 /* Do the allocs. */
1890 ptr = module_alloc(mod->core_size);
1895 memset(ptr, 0, mod->core_size);
1896 mod->module_core = ptr;
1898 ptr = module_alloc(mod->init_size);
1899 if (!ptr && mod->init_size) {
1903 memset(ptr, 0, mod->init_size);
1904 mod->module_init = ptr;
1906 /* Transfer each section which specifies SHF_ALLOC */
1907 DEBUGP("final section addresses:\n");
1908 for (i = 0; i < hdr->e_shnum; i++) {
1911 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1914 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1915 dest = mod->module_init
1916 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1918 dest = mod->module_core + sechdrs[i].sh_entsize;
1920 if (sechdrs[i].sh_type != SHT_NOBITS)
1921 memcpy(dest, (void *)sechdrs[i].sh_addr,
1922 sechdrs[i].sh_size);
1923 /* Update sh_addr to point to copy in image. */
1924 sechdrs[i].sh_addr = (unsigned long)dest;
1925 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1927 /* Module has been moved. */
1928 mod = (void *)sechdrs[modindex].sh_addr;
1930 /* Now we've moved module, initialize linked lists, etc. */
1931 module_unload_init(mod);
1933 /* add kobject, so we can reference it. */
1934 err = mod_sysfs_init(mod);
1938 /* Set up license info based on the info section */
1939 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1941 if (strcmp(mod->name, "ndiswrapper") == 0)
1942 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1943 if (strcmp(mod->name, "driverloader") == 0)
1944 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1946 /* Set up MODINFO_ATTR fields */
1947 setup_modinfo(mod, sechdrs, infoindex);
1949 /* Fix up syms, so that st_value is a pointer to location. */
1950 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1955 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1956 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1957 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1959 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1960 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1961 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1963 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1964 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1965 sizeof(*mod->gpl_future_syms);
1966 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
1967 sizeof(*mod->unused_syms);
1968 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
1969 sizeof(*mod->unused_gpl_syms);
1970 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1971 if (gplfuturecrcindex)
1972 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
1974 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
1976 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
1977 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
1978 if (unusedgplcrcindex)
1979 mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
1981 #ifdef CONFIG_MODVERSIONS
1982 if ((mod->num_syms && !crcindex) ||
1983 (mod->num_gpl_syms && !gplcrcindex) ||
1984 (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
1985 (mod->num_unused_syms && !unusedcrcindex) ||
1986 (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
1987 printk(KERN_WARNING "%s: No versions for exported symbols."
1988 " Tainting kernel.\n", mod->name);
1989 add_taint_module(mod, TAINT_FORCED_MODULE);
1992 markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
1993 markersstringsindex = find_sec(hdr, sechdrs, secstrings,
1994 "__markers_strings");
1996 /* Now do relocations. */
1997 for (i = 1; i < hdr->e_shnum; i++) {
1998 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1999 unsigned int info = sechdrs[i].sh_info;
2001 /* Not a valid relocation section? */
2002 if (info >= hdr->e_shnum)
2005 /* Don't bother with non-allocated sections */
2006 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2009 if (sechdrs[i].sh_type == SHT_REL)
2010 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2011 else if (sechdrs[i].sh_type == SHT_RELA)
2012 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2017 #ifdef CONFIG_MARKERS
2018 mod->markers = (void *)sechdrs[markersindex].sh_addr;
2020 sechdrs[markersindex].sh_size / sizeof(*mod->markers);
2023 /* Find duplicate symbols */
2024 err = verify_export_symbols(mod);
2029 /* Set up and sort exception table */
2030 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
2031 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
2032 sort_extable(extable, extable + mod->num_exentries);
2034 /* Finally, copy percpu area over. */
2035 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2036 sechdrs[pcpuindex].sh_size);
2038 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2040 #ifdef CONFIG_MARKERS
2042 marker_update_probe_range(mod->markers,
2043 mod->markers + mod->num_markers, NULL, NULL);
2045 err = module_finalize(hdr, sechdrs, mod);
2049 /* flush the icache in correct context */
2054 * Flush the instruction cache, since we've played with text.
2055 * Do it before processing of module parameters, so the module
2056 * can provide parameter accessor functions of its own.
2058 if (mod->module_init)
2059 flush_icache_range((unsigned long)mod->module_init,
2060 (unsigned long)mod->module_init
2062 flush_icache_range((unsigned long)mod->module_core,
2063 (unsigned long)mod->module_core + mod->core_size);
2069 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2072 /* Now sew it into the lists so we can get lockdep and oops
2073 * info during argument parsing. Noone should access us, since
2074 * strong_try_module_get() will fail. */
2075 stop_machine_run(__link_module, mod, NR_CPUS);
2077 /* Size of section 0 is 0, so this works well if no params */
2078 err = parse_args(mod->name, mod->args,
2079 (struct kernel_param *)
2080 sechdrs[setupindex].sh_addr,
2081 sechdrs[setupindex].sh_size
2082 / sizeof(struct kernel_param),
2087 err = mod_sysfs_setup(mod,
2088 (struct kernel_param *)
2089 sechdrs[setupindex].sh_addr,
2090 sechdrs[setupindex].sh_size
2091 / sizeof(struct kernel_param));
2094 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2095 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2097 /* Size of section 0 is 0, so this works well if no unwind info. */
2098 mod->unwind_info = unwind_add_table(mod,
2099 (void *)sechdrs[unwindex].sh_addr,
2100 sechdrs[unwindex].sh_size);
2102 /* Get rid of temporary copy */
2109 stop_machine_run(__unlink_module, mod, NR_CPUS);
2110 module_arch_cleanup(mod);
2112 kobject_del(&mod->mkobj.kobj);
2113 kobject_put(&mod->mkobj.kobj);
2115 module_unload_free(mod);
2116 module_free(mod, mod->module_init);
2118 module_free(mod, mod->module_core);
2121 percpu_modfree(percpu);
2126 return ERR_PTR(err);
2129 printk(KERN_ERR "Module len %lu truncated\n", len);
2134 /* This is where the real work happens */
2136 sys_init_module(void __user *umod,
2138 const char __user *uargs)
2143 /* Must have permission */
2144 if (!capable(CAP_SYS_MODULE))
2147 /* Only one module load at a time, please */
2148 if (mutex_lock_interruptible(&module_mutex) != 0)
2151 /* Do all the hard work */
2152 mod = load_module(umod, len, uargs);
2154 mutex_unlock(&module_mutex);
2155 return PTR_ERR(mod);
2158 /* Drop lock so they can recurse */
2159 mutex_unlock(&module_mutex);
2161 blocking_notifier_call_chain(&module_notify_list,
2162 MODULE_STATE_COMING, mod);
2164 /* Start the module */
2165 if (mod->init != NULL)
2168 /* Init routine failed: abort. Try to protect us from
2169 buggy refcounters. */
2170 mod->state = MODULE_STATE_GOING;
2171 synchronize_sched();
2173 mutex_lock(&module_mutex);
2175 mutex_unlock(&module_mutex);
2176 wake_up(&module_wq);
2180 /* Now it's a first class citizen! */
2181 mutex_lock(&module_mutex);
2182 mod->state = MODULE_STATE_LIVE;
2183 /* Drop initial reference. */
2185 unwind_remove_table(mod->unwind_info, 1);
2186 module_free(mod, mod->module_init);
2187 mod->module_init = NULL;
2189 mod->init_text_size = 0;
2190 mutex_unlock(&module_mutex);
2191 wake_up(&module_wq);
2196 static inline int within(unsigned long addr, void *start, unsigned long size)
2198 return ((void *)addr >= start && (void *)addr < start + size);
2201 #ifdef CONFIG_KALLSYMS
2203 * This ignores the intensely annoying "mapping symbols" found
2204 * in ARM ELF files: $a, $t and $d.
2206 static inline int is_arm_mapping_symbol(const char *str)
2208 return str[0] == '$' && strchr("atd", str[1])
2209 && (str[2] == '\0' || str[2] == '.');
2212 static const char *get_ksymbol(struct module *mod,
2214 unsigned long *size,
2215 unsigned long *offset)
2217 unsigned int i, best = 0;
2218 unsigned long nextval;
2220 /* At worse, next value is at end of module */
2221 if (within(addr, mod->module_init, mod->init_size))
2222 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2224 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2226 /* Scan for closest preceeding symbol, and next symbol. (ELF
2227 starts real symbols at 1). */
2228 for (i = 1; i < mod->num_symtab; i++) {
2229 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2232 /* We ignore unnamed symbols: they're uninformative
2233 * and inserted at a whim. */
2234 if (mod->symtab[i].st_value <= addr
2235 && mod->symtab[i].st_value > mod->symtab[best].st_value
2236 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2237 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2239 if (mod->symtab[i].st_value > addr
2240 && mod->symtab[i].st_value < nextval
2241 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2242 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2243 nextval = mod->symtab[i].st_value;
2250 *size = nextval - mod->symtab[best].st_value;
2252 *offset = addr - mod->symtab[best].st_value;
2253 return mod->strtab + mod->symtab[best].st_name;
2256 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2257 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2258 char *module_address_lookup(unsigned long addr,
2259 unsigned long *size,
2260 unsigned long *offset,
2265 const char *ret = NULL;
2268 list_for_each_entry(mod, &modules, list) {
2269 if (within(addr, mod->module_init, mod->init_size)
2270 || within(addr, mod->module_core, mod->core_size)) {
2272 *modname = mod->name;
2273 ret = get_ksymbol(mod, addr, size, offset);
2277 /* Make a copy in here where it's safe */
2279 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2286 int lookup_module_symbol_name(unsigned long addr, char *symname)
2291 list_for_each_entry(mod, &modules, list) {
2292 if (within(addr, mod->module_init, mod->init_size) ||
2293 within(addr, mod->module_core, mod->core_size)) {
2296 sym = get_ksymbol(mod, addr, NULL, NULL);
2299 strlcpy(symname, sym, KSYM_NAME_LEN);
2309 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2310 unsigned long *offset, char *modname, char *name)
2315 list_for_each_entry(mod, &modules, list) {
2316 if (within(addr, mod->module_init, mod->init_size) ||
2317 within(addr, mod->module_core, mod->core_size)) {
2320 sym = get_ksymbol(mod, addr, size, offset);
2324 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2326 strlcpy(name, sym, KSYM_NAME_LEN);
2336 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2337 char *name, char *module_name, int *exported)
2342 list_for_each_entry(mod, &modules, list) {
2343 if (symnum < mod->num_symtab) {
2344 *value = mod->symtab[symnum].st_value;
2345 *type = mod->symtab[symnum].st_info;
2346 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2348 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2349 *exported = is_exported(name, mod);
2353 symnum -= mod->num_symtab;
2359 static unsigned long mod_find_symname(struct module *mod, const char *name)
2363 for (i = 0; i < mod->num_symtab; i++)
2364 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2365 mod->symtab[i].st_info != 'U')
2366 return mod->symtab[i].st_value;
2370 /* Look for this name: can be of form module:name. */
2371 unsigned long module_kallsyms_lookup_name(const char *name)
2375 unsigned long ret = 0;
2377 /* Don't lock: we're in enough trouble already. */
2379 if ((colon = strchr(name, ':')) != NULL) {
2381 if ((mod = find_module(name)) != NULL)
2382 ret = mod_find_symname(mod, colon+1);
2385 list_for_each_entry(mod, &modules, list)
2386 if ((ret = mod_find_symname(mod, name)) != 0)
2392 #endif /* CONFIG_KALLSYMS */
2394 /* Called by the /proc file system to return a list of modules. */
2395 static void *m_start(struct seq_file *m, loff_t *pos)
2397 mutex_lock(&module_mutex);
2398 return seq_list_start(&modules, *pos);
2401 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2403 return seq_list_next(p, &modules, pos);
2406 static void m_stop(struct seq_file *m, void *p)
2408 mutex_unlock(&module_mutex);
2411 static char *module_flags(struct module *mod, char *buf)
2416 mod->state == MODULE_STATE_GOING ||
2417 mod->state == MODULE_STATE_COMING) {
2419 if (mod->taints & TAINT_PROPRIETARY_MODULE)
2421 if (mod->taints & TAINT_FORCED_MODULE)
2424 * TAINT_FORCED_RMMOD: could be added.
2425 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2429 /* Show a - for module-is-being-unloaded */
2430 if (mod->state == MODULE_STATE_GOING)
2432 /* Show a + for module-is-being-loaded */
2433 if (mod->state == MODULE_STATE_COMING)
2442 static int m_show(struct seq_file *m, void *p)
2444 struct module *mod = list_entry(p, struct module, list);
2447 seq_printf(m, "%s %lu",
2448 mod->name, mod->init_size + mod->core_size);
2449 print_unload_info(m, mod);
2451 /* Informative for users. */
2452 seq_printf(m, " %s",
2453 mod->state == MODULE_STATE_GOING ? "Unloading":
2454 mod->state == MODULE_STATE_COMING ? "Loading":
2456 /* Used by oprofile and other similar tools. */
2457 seq_printf(m, " 0x%p", mod->module_core);
2461 seq_printf(m, " %s", module_flags(mod, buf));
2463 seq_printf(m, "\n");
2467 /* Format: modulename size refcount deps address
2469 Where refcount is a number or -, and deps is a comma-separated list
2472 const struct seq_operations modules_op = {
2479 /* Given an address, look for it in the module exception tables. */
2480 const struct exception_table_entry *search_module_extables(unsigned long addr)
2482 const struct exception_table_entry *e = NULL;
2486 list_for_each_entry(mod, &modules, list) {
2487 if (mod->num_exentries == 0)
2490 e = search_extable(mod->extable,
2491 mod->extable + mod->num_exentries - 1,
2498 /* Now, if we found one, we are running inside it now, hence
2499 we cannot unload the module, hence no refcnt needed. */
2504 * Is this a valid module address?
2506 int is_module_address(unsigned long addr)
2512 list_for_each_entry(mod, &modules, list) {
2513 if (within(addr, mod->module_core, mod->core_size)) {
2525 /* Is this a valid kernel address? */
2526 struct module *__module_text_address(unsigned long addr)
2530 list_for_each_entry(mod, &modules, list)
2531 if (within(addr, mod->module_init, mod->init_text_size)
2532 || within(addr, mod->module_core, mod->core_text_size))
2537 struct module *module_text_address(unsigned long addr)
2542 mod = __module_text_address(addr);
2548 /* Don't grab lock, we're oopsing. */
2549 void print_modules(void)
2554 printk("Modules linked in:");
2555 list_for_each_entry(mod, &modules, list)
2556 printk(" %s%s", mod->name, module_flags(mod, buf));
2557 if (last_unloaded_module[0])
2558 printk(" [last unloaded: %s]", last_unloaded_module);
2562 #ifdef CONFIG_MODVERSIONS
2563 /* Generate the signature for struct module here, too, for modversions. */
2564 void struct_module(struct module *mod) { return; }
2565 EXPORT_SYMBOL(struct_module);
2568 #ifdef CONFIG_MARKERS
2569 void module_update_markers(struct module *probe_module, int *refcount)
2573 mutex_lock(&module_mutex);
2574 list_for_each_entry(mod, &modules, list)
2576 marker_update_probe_range(mod->markers,
2577 mod->markers + mod->num_markers,
2578 probe_module, refcount);
2579 mutex_unlock(&module_mutex);