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
!= NULL
&& mod
->exit
== NULL
)
697 forced
= try_force_unload(flags
);
699 /* This module can't be removed */
705 /* Set this up before setting mod->state */
706 mod
->waiter
= current
;
708 /* Stop the machine so refcounts can't move and disable module. */
709 ret
= try_stop_module(mod
, flags
, &forced
);
713 /* Never wait if forced. */
714 if (!forced
&& module_refcount(mod
) != 0)
715 wait_for_zero_refcount(mod
);
717 /* Final destruction now noone is using it. */
718 if (mod
->exit
!= NULL
) {
719 mutex_unlock(&module_mutex
);
721 mutex_lock(&module_mutex
);
726 mutex_unlock(&module_mutex
);
730 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
732 struct module_use
*use
;
733 int printed_something
= 0;
735 seq_printf(m
, " %u ", module_refcount(mod
));
737 /* Always include a trailing , so userspace can differentiate
738 between this and the old multi-field proc format. */
739 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
740 printed_something
= 1;
741 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
745 printed_something
= 1;
746 seq_printf(m
, "[unsafe],");
749 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
750 printed_something
= 1;
751 seq_printf(m
, "[permanent],");
754 if (!printed_something
)
758 void __symbol_put(const char *symbol
)
760 struct module
*owner
;
761 const unsigned long *crc
;
764 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
769 EXPORT_SYMBOL(__symbol_put
);
771 void symbol_put_addr(void *addr
)
773 struct module
*modaddr
;
775 if (core_kernel_text((unsigned long)addr
))
778 if (!(modaddr
= module_text_address((unsigned long)addr
)))
782 EXPORT_SYMBOL_GPL(symbol_put_addr
);
784 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
785 struct module
*mod
, char *buffer
)
787 return sprintf(buffer
, "%u\n", module_refcount(mod
));
790 static struct module_attribute refcnt
= {
791 .attr
= { .name
= "refcnt", .mode
= 0444 },
795 void module_put(struct module
*module
)
798 unsigned int cpu
= get_cpu();
799 local_dec(&module
->ref
[cpu
].count
);
800 /* Maybe they're waiting for us to drop reference? */
801 if (unlikely(!module_is_live(module
)))
802 wake_up_process(module
->waiter
);
806 EXPORT_SYMBOL(module_put
);
808 #else /* !CONFIG_MODULE_UNLOAD */
809 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
811 /* We don't know the usage count, or what modules are using. */
812 seq_printf(m
, " - -");
815 static inline void module_unload_free(struct module
*mod
)
819 static inline int use_module(struct module
*a
, struct module
*b
)
821 return strong_try_module_get(b
);
824 static inline void module_unload_init(struct module
*mod
)
827 #endif /* CONFIG_MODULE_UNLOAD */
829 static ssize_t
show_initstate(struct module_attribute
*mattr
,
830 struct module
*mod
, char *buffer
)
832 const char *state
= "unknown";
834 switch (mod
->state
) {
835 case MODULE_STATE_LIVE
:
838 case MODULE_STATE_COMING
:
841 case MODULE_STATE_GOING
:
845 return sprintf(buffer
, "%s\n", state
);
848 static struct module_attribute initstate
= {
849 .attr
= { .name
= "initstate", .mode
= 0444 },
850 .show
= show_initstate
,
853 static struct module_attribute
*modinfo_attrs
[] = {
857 #ifdef CONFIG_MODULE_UNLOAD
863 static const char vermagic
[] = VERMAGIC_STRING
;
865 #ifdef CONFIG_MODVERSIONS
866 static int check_version(Elf_Shdr
*sechdrs
,
867 unsigned int versindex
,
870 const unsigned long *crc
)
872 unsigned int i
, num_versions
;
873 struct modversion_info
*versions
;
875 /* Exporting module didn't supply crcs? OK, we're already tainted. */
879 versions
= (void *) sechdrs
[versindex
].sh_addr
;
880 num_versions
= sechdrs
[versindex
].sh_size
881 / sizeof(struct modversion_info
);
883 for (i
= 0; i
< num_versions
; i
++) {
884 if (strcmp(versions
[i
].name
, symname
) != 0)
887 if (versions
[i
].crc
== *crc
)
889 printk("%s: disagrees about version of symbol %s\n",
891 DEBUGP("Found checksum %lX vs module %lX\n",
892 *crc
, versions
[i
].crc
);
895 /* Not in module's version table. OK, but that taints the kernel. */
896 if (!(tainted
& TAINT_FORCED_MODULE
))
897 printk("%s: no version for \"%s\" found: kernel tainted.\n",
899 add_taint_module(mod
, TAINT_FORCED_MODULE
);
903 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
904 unsigned int versindex
,
907 const unsigned long *crc
;
908 struct module
*owner
;
910 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
912 return check_version(sechdrs
, versindex
, "struct_module", mod
,
916 /* First part is kernel version, which we ignore. */
917 static inline int same_magic(const char *amagic
, const char *bmagic
)
919 amagic
+= strcspn(amagic
, " ");
920 bmagic
+= strcspn(bmagic
, " ");
921 return strcmp(amagic
, bmagic
) == 0;
924 static inline int check_version(Elf_Shdr
*sechdrs
,
925 unsigned int versindex
,
928 const unsigned long *crc
)
933 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
934 unsigned int versindex
,
940 static inline int same_magic(const char *amagic
, const char *bmagic
)
942 return strcmp(amagic
, bmagic
) == 0;
944 #endif /* CONFIG_MODVERSIONS */
946 /* Resolve a symbol for this module. I.e. if we find one, record usage.
947 Must be holding module_mutex. */
948 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
949 unsigned int versindex
,
953 struct module
*owner
;
955 const unsigned long *crc
;
957 ret
= __find_symbol(name
, &owner
, &crc
,
958 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
));
960 /* use_module can fail due to OOM, or module unloading */
961 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
962 !use_module(mod
, owner
))
970 * /sys/module/foo/sections stuff
971 * J. Corbet <corbet@lwn.net>
973 #ifdef CONFIG_KALLSYMS
974 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
975 struct module
*mod
, char *buf
)
977 struct module_sect_attr
*sattr
=
978 container_of(mattr
, struct module_sect_attr
, mattr
);
979 return sprintf(buf
, "0x%lx\n", sattr
->address
);
982 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
986 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
987 kfree(sect_attrs
->attrs
[section
].name
);
991 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
992 char *secstrings
, Elf_Shdr
*sechdrs
)
994 unsigned int nloaded
= 0, i
, size
[2];
995 struct module_sect_attrs
*sect_attrs
;
996 struct module_sect_attr
*sattr
;
997 struct attribute
**gattr
;
999 /* Count loaded sections and allocate structures */
1000 for (i
= 0; i
< nsect
; i
++)
1001 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1003 size
[0] = ALIGN(sizeof(*sect_attrs
)
1004 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1005 sizeof(sect_attrs
->grp
.attrs
[0]));
1006 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1007 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1008 if (sect_attrs
== NULL
)
1011 /* Setup section attributes. */
1012 sect_attrs
->grp
.name
= "sections";
1013 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1015 sect_attrs
->nsections
= 0;
1016 sattr
= §_attrs
->attrs
[0];
1017 gattr
= §_attrs
->grp
.attrs
[0];
1018 for (i
= 0; i
< nsect
; i
++) {
1019 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1021 sattr
->address
= sechdrs
[i
].sh_addr
;
1022 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1024 if (sattr
->name
== NULL
)
1026 sect_attrs
->nsections
++;
1027 sattr
->mattr
.show
= module_sect_show
;
1028 sattr
->mattr
.store
= NULL
;
1029 sattr
->mattr
.attr
.name
= sattr
->name
;
1030 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1031 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1035 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1038 mod
->sect_attrs
= sect_attrs
;
1041 free_sect_attrs(sect_attrs
);
1044 static void remove_sect_attrs(struct module
*mod
)
1046 if (mod
->sect_attrs
) {
1047 sysfs_remove_group(&mod
->mkobj
.kobj
,
1048 &mod
->sect_attrs
->grp
);
1049 /* We are positive that no one is using any sect attrs
1050 * at this point. Deallocate immediately. */
1051 free_sect_attrs(mod
->sect_attrs
);
1052 mod
->sect_attrs
= NULL
;
1058 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1059 char *sectstrings
, Elf_Shdr
*sechdrs
)
1063 static inline void remove_sect_attrs(struct module
*mod
)
1066 #endif /* CONFIG_KALLSYMS */
1069 int module_add_modinfo_attrs(struct module
*mod
)
1071 struct module_attribute
*attr
;
1072 struct module_attribute
*temp_attr
;
1076 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1077 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1079 if (!mod
->modinfo_attrs
)
1082 temp_attr
= mod
->modinfo_attrs
;
1083 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1085 (attr
->test
&& attr
->test(mod
))) {
1086 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1087 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1094 void module_remove_modinfo_attrs(struct module
*mod
)
1096 struct module_attribute
*attr
;
1099 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1100 /* pick a field to test for end of list */
1101 if (!attr
->attr
.name
)
1103 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1107 kfree(mod
->modinfo_attrs
);
1112 int mod_sysfs_init(struct module
*mod
)
1116 if (!module_sysfs_initialized
) {
1117 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1122 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1123 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1126 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1127 mod
->mkobj
.mod
= mod
;
1129 kobject_init(&mod
->mkobj
.kobj
);
1135 int mod_sysfs_setup(struct module
*mod
,
1136 struct kernel_param
*kparam
,
1137 unsigned int num_params
)
1141 /* delay uevent until full sysfs population */
1142 err
= kobject_add(&mod
->mkobj
.kobj
);
1146 mod
->holders_dir
= kobject_add_dir(&mod
->mkobj
.kobj
, "holders");
1147 if (!mod
->holders_dir
) {
1152 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1154 goto out_unreg_holders
;
1156 err
= module_add_modinfo_attrs(mod
);
1158 goto out_unreg_param
;
1160 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1164 module_param_sysfs_remove(mod
);
1166 kobject_unregister(mod
->holders_dir
);
1168 kobject_del(&mod
->mkobj
.kobj
);
1169 kobject_put(&mod
->mkobj
.kobj
);
1175 static void mod_kobject_remove(struct module
*mod
)
1177 module_remove_modinfo_attrs(mod
);
1178 module_param_sysfs_remove(mod
);
1179 kobject_unregister(mod
->mkobj
.drivers_dir
);
1180 kobject_unregister(mod
->holders_dir
);
1181 kobject_unregister(&mod
->mkobj
.kobj
);
1185 * unlink the module with the whole machine is stopped with interrupts off
1186 * - this defends against kallsyms not taking locks
1188 static int __unlink_module(void *_mod
)
1190 struct module
*mod
= _mod
;
1191 list_del(&mod
->list
);
1195 /* Free a module, remove from lists, etc (must hold module_mutex). */
1196 static void free_module(struct module
*mod
)
1198 /* Delete from various lists */
1199 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1200 remove_sect_attrs(mod
);
1201 mod_kobject_remove(mod
);
1203 unwind_remove_table(mod
->unwind_info
, 0);
1205 /* Arch-specific cleanup. */
1206 module_arch_cleanup(mod
);
1208 /* Module unload stuff */
1209 module_unload_free(mod
);
1211 /* This may be NULL, but that's OK */
1212 module_free(mod
, mod
->module_init
);
1215 percpu_modfree(mod
->percpu
);
1217 /* Free lock-classes: */
1218 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1220 /* Finally, free the core (containing the module structure) */
1221 module_free(mod
, mod
->module_core
);
1224 void *__symbol_get(const char *symbol
)
1226 struct module
*owner
;
1227 unsigned long value
;
1228 const unsigned long *crc
;
1231 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1232 if (value
&& !strong_try_module_get(owner
))
1236 return (void *)value
;
1238 EXPORT_SYMBOL_GPL(__symbol_get
);
1241 * Ensure that an exported symbol [global namespace] does not already exist
1242 * in the kernel or in some other module's exported symbol table.
1244 static int verify_export_symbols(struct module
*mod
)
1246 const char *name
= NULL
;
1247 unsigned long i
, ret
= 0;
1248 struct module
*owner
;
1249 const unsigned long *crc
;
1251 for (i
= 0; i
< mod
->num_syms
; i
++)
1252 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1253 name
= mod
->syms
[i
].name
;
1258 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1259 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1260 name
= mod
->gpl_syms
[i
].name
;
1267 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1268 mod
->name
, name
, module_name(owner
));
1273 /* Change all symbols so that sh_value encodes the pointer directly. */
1274 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1275 unsigned int symindex
,
1277 unsigned int versindex
,
1278 unsigned int pcpuindex
,
1281 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1282 unsigned long secbase
;
1283 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1286 for (i
= 1; i
< n
; i
++) {
1287 switch (sym
[i
].st_shndx
) {
1289 /* We compiled with -fno-common. These are not
1290 supposed to happen. */
1291 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1292 printk("%s: please compile with -fno-common\n",
1298 /* Don't need to do anything */
1299 DEBUGP("Absolute symbol: 0x%08lx\n",
1300 (long)sym
[i
].st_value
);
1305 = resolve_symbol(sechdrs
, versindex
,
1306 strtab
+ sym
[i
].st_name
, mod
);
1308 /* Ok if resolved. */
1309 if (sym
[i
].st_value
!= 0)
1312 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1315 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1316 mod
->name
, strtab
+ sym
[i
].st_name
);
1321 /* Divert to percpu allocation if a percpu var. */
1322 if (sym
[i
].st_shndx
== pcpuindex
)
1323 secbase
= (unsigned long)mod
->percpu
;
1325 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1326 sym
[i
].st_value
+= secbase
;
1334 /* Update size with this section: return offset. */
1335 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1339 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1340 *size
= ret
+ sechdr
->sh_size
;
1344 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1345 might -- code, read-only data, read-write data, small data. Tally
1346 sizes, and place the offsets into sh_entsize fields: high bit means it
1348 static void layout_sections(struct module
*mod
,
1349 const Elf_Ehdr
*hdr
,
1351 const char *secstrings
)
1353 static unsigned long const masks
[][2] = {
1354 /* NOTE: all executable code must be the first section
1355 * in this array; otherwise modify the text_size
1356 * finder in the two loops below */
1357 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1358 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1359 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1360 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1364 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1365 sechdrs
[i
].sh_entsize
= ~0UL;
1367 DEBUGP("Core section allocation order:\n");
1368 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1369 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1370 Elf_Shdr
*s
= &sechdrs
[i
];
1372 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1373 || (s
->sh_flags
& masks
[m
][1])
1374 || s
->sh_entsize
!= ~0UL
1375 || strncmp(secstrings
+ s
->sh_name
,
1378 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1379 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1382 mod
->core_text_size
= mod
->core_size
;
1385 DEBUGP("Init section allocation order:\n");
1386 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1387 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1388 Elf_Shdr
*s
= &sechdrs
[i
];
1390 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1391 || (s
->sh_flags
& masks
[m
][1])
1392 || s
->sh_entsize
!= ~0UL
1393 || strncmp(secstrings
+ s
->sh_name
,
1396 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1397 | INIT_OFFSET_MASK
);
1398 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1401 mod
->init_text_size
= mod
->init_size
;
1405 static void set_license(struct module
*mod
, const char *license
)
1408 license
= "unspecified";
1410 if (!license_is_gpl_compatible(license
)) {
1411 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1412 printk(KERN_WARNING
"%s: module license '%s' taints "
1413 "kernel.\n", mod
->name
, license
);
1414 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1418 /* Parse tag=value strings from .modinfo section */
1419 static char *next_string(char *string
, unsigned long *secsize
)
1421 /* Skip non-zero chars */
1424 if ((*secsize
)-- <= 1)
1428 /* Skip any zero padding. */
1429 while (!string
[0]) {
1431 if ((*secsize
)-- <= 1)
1437 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1442 unsigned int taglen
= strlen(tag
);
1443 unsigned long size
= sechdrs
[info
].sh_size
;
1445 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1446 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1447 return p
+ taglen
+ 1;
1452 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1453 unsigned int infoindex
)
1455 struct module_attribute
*attr
;
1458 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1461 get_modinfo(sechdrs
,
1467 #ifdef CONFIG_KALLSYMS
1468 static int is_exported(const char *name
, const struct module
*mod
)
1470 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1473 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1480 static char elf_type(const Elf_Sym
*sym
,
1482 const char *secstrings
,
1485 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1486 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1491 if (sym
->st_shndx
== SHN_UNDEF
)
1493 if (sym
->st_shndx
== SHN_ABS
)
1495 if (sym
->st_shndx
>= SHN_LORESERVE
)
1497 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1499 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1500 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1501 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1503 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1508 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1509 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1514 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1515 ".debug", strlen(".debug")) == 0)
1520 static void add_kallsyms(struct module
*mod
,
1522 unsigned int symindex
,
1523 unsigned int strindex
,
1524 const char *secstrings
)
1528 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1529 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1530 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1532 /* Set types up while we still have access to sections. */
1533 for (i
= 0; i
< mod
->num_symtab
; i
++)
1534 mod
->symtab
[i
].st_info
1535 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1538 static inline void add_kallsyms(struct module
*mod
,
1540 unsigned int symindex
,
1541 unsigned int strindex
,
1542 const char *secstrings
)
1545 #endif /* CONFIG_KALLSYMS */
1547 /* Allocate and load the module: note that size of section 0 is always
1548 zero, and we rely on this for optional sections. */
1549 static struct module
*load_module(void __user
*umod
,
1551 const char __user
*uargs
)
1555 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1557 unsigned int symindex
= 0;
1558 unsigned int strindex
= 0;
1559 unsigned int setupindex
;
1560 unsigned int exindex
;
1561 unsigned int exportindex
;
1562 unsigned int modindex
;
1563 unsigned int obsparmindex
;
1564 unsigned int infoindex
;
1565 unsigned int gplindex
;
1566 unsigned int crcindex
;
1567 unsigned int gplcrcindex
;
1568 unsigned int versindex
;
1569 unsigned int pcpuindex
;
1570 unsigned int gplfutureindex
;
1571 unsigned int gplfuturecrcindex
;
1572 unsigned int unwindex
= 0;
1573 unsigned int unusedindex
;
1574 unsigned int unusedcrcindex
;
1575 unsigned int unusedgplindex
;
1576 unsigned int unusedgplcrcindex
;
1579 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1580 struct exception_table_entry
*extable
;
1581 mm_segment_t old_fs
;
1583 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1585 if (len
< sizeof(*hdr
))
1586 return ERR_PTR(-ENOEXEC
);
1588 /* Suck in entire file: we'll want most of it. */
1589 /* vmalloc barfs on "unusual" numbers. Check here */
1590 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1591 return ERR_PTR(-ENOMEM
);
1592 if (copy_from_user(hdr
, umod
, len
) != 0) {
1597 /* Sanity checks against insmoding binaries or wrong arch,
1598 weird elf version */
1599 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1600 || hdr
->e_type
!= ET_REL
1601 || !elf_check_arch(hdr
)
1602 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1607 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1610 /* Convenience variables */
1611 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1612 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1613 sechdrs
[0].sh_addr
= 0;
1615 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1616 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1617 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1620 /* Mark all sections sh_addr with their address in the
1622 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1624 /* Internal symbols and strings. */
1625 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1627 strindex
= sechdrs
[i
].sh_link
;
1628 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1630 #ifndef CONFIG_MODULE_UNLOAD
1631 /* Don't load .exit sections */
1632 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1633 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1637 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1638 ".gnu.linkonce.this_module");
1640 printk(KERN_WARNING
"No module found in object\n");
1644 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1646 if (symindex
== 0) {
1647 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1653 /* Optional sections */
1654 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1655 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1656 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1657 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1658 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1659 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1660 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1661 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1662 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1663 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1664 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1665 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1666 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1667 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1668 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1669 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1670 #ifdef ARCH_UNWIND_SECTION_NAME
1671 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1674 /* Don't keep modinfo section */
1675 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1676 #ifdef CONFIG_KALLSYMS
1677 /* Keep symbol and string tables for decoding later. */
1678 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1679 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1682 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1684 /* Check module struct version now, before we try to use module. */
1685 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1690 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1691 /* This is allowed: modprobe --force will invalidate it. */
1693 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1694 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1696 } else if (!same_magic(modmagic
, vermagic
)) {
1697 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1698 mod
->name
, modmagic
, vermagic
);
1703 /* Now copy in args */
1704 args
= strndup_user(uargs
, ~0UL >> 1);
1706 err
= PTR_ERR(args
);
1710 if (find_module(mod
->name
)) {
1715 mod
->state
= MODULE_STATE_COMING
;
1717 /* Allow arches to frob section contents and sizes. */
1718 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1723 /* We have a special allocation for this section. */
1724 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1725 sechdrs
[pcpuindex
].sh_addralign
,
1731 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1732 mod
->percpu
= percpu
;
1735 /* Determine total sizes, and put offsets in sh_entsize. For now
1736 this is done generically; there doesn't appear to be any
1737 special cases for the architectures. */
1738 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1740 /* Do the allocs. */
1741 ptr
= module_alloc(mod
->core_size
);
1746 memset(ptr
, 0, mod
->core_size
);
1747 mod
->module_core
= ptr
;
1749 ptr
= module_alloc(mod
->init_size
);
1750 if (!ptr
&& mod
->init_size
) {
1754 memset(ptr
, 0, mod
->init_size
);
1755 mod
->module_init
= ptr
;
1757 /* Transfer each section which specifies SHF_ALLOC */
1758 DEBUGP("final section addresses:\n");
1759 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1762 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1765 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1766 dest
= mod
->module_init
1767 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1769 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1771 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1772 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1773 sechdrs
[i
].sh_size
);
1774 /* Update sh_addr to point to copy in image. */
1775 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1776 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1778 /* Module has been moved. */
1779 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1781 /* Now we've moved module, initialize linked lists, etc. */
1782 module_unload_init(mod
);
1784 /* Initialize kobject, so we can reference it. */
1785 if (mod_sysfs_init(mod
) != 0)
1788 /* Set up license info based on the info section */
1789 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1791 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1792 add_taint(TAINT_PROPRIETARY_MODULE
);
1793 if (strcmp(mod
->name
, "driverloader") == 0)
1794 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1796 /* Set up MODINFO_ATTR fields */
1797 setup_modinfo(mod
, sechdrs
, infoindex
);
1799 /* Fix up syms, so that st_value is a pointer to location. */
1800 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1805 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1806 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1807 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1809 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1810 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1811 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1813 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1814 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1815 sizeof(*mod
->gpl_future_syms
);
1816 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1817 sizeof(*mod
->unused_syms
);
1818 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1819 sizeof(*mod
->unused_gpl_syms
);
1820 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1821 if (gplfuturecrcindex
)
1822 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1824 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1826 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1827 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1828 if (unusedgplcrcindex
)
1829 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1831 #ifdef CONFIG_MODVERSIONS
1832 if ((mod
->num_syms
&& !crcindex
) ||
1833 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1834 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1835 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1836 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1837 printk(KERN_WARNING
"%s: No versions for exported symbols."
1838 " Tainting kernel.\n", mod
->name
);
1839 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1843 /* Now do relocations. */
1844 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1845 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1846 unsigned int info
= sechdrs
[i
].sh_info
;
1848 /* Not a valid relocation section? */
1849 if (info
>= hdr
->e_shnum
)
1852 /* Don't bother with non-allocated sections */
1853 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1856 if (sechdrs
[i
].sh_type
== SHT_REL
)
1857 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1858 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1859 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1865 /* Find duplicate symbols */
1866 err
= verify_export_symbols(mod
);
1871 /* Set up and sort exception table */
1872 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1873 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1874 sort_extable(extable
, extable
+ mod
->num_exentries
);
1876 /* Finally, copy percpu area over. */
1877 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1878 sechdrs
[pcpuindex
].sh_size
);
1880 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1882 err
= module_finalize(hdr
, sechdrs
, mod
);
1886 /* flush the icache in correct context */
1891 * Flush the instruction cache, since we've played with text.
1892 * Do it before processing of module parameters, so the module
1893 * can provide parameter accessor functions of its own.
1895 if (mod
->module_init
)
1896 flush_icache_range((unsigned long)mod
->module_init
,
1897 (unsigned long)mod
->module_init
1899 flush_icache_range((unsigned long)mod
->module_core
,
1900 (unsigned long)mod
->module_core
+ mod
->core_size
);
1906 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
1909 /* Size of section 0 is 0, so this works well if no params */
1910 err
= parse_args(mod
->name
, mod
->args
,
1911 (struct kernel_param
*)
1912 sechdrs
[setupindex
].sh_addr
,
1913 sechdrs
[setupindex
].sh_size
1914 / sizeof(struct kernel_param
),
1919 err
= mod_sysfs_setup(mod
,
1920 (struct kernel_param
*)
1921 sechdrs
[setupindex
].sh_addr
,
1922 sechdrs
[setupindex
].sh_size
1923 / sizeof(struct kernel_param
));
1926 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1928 /* Size of section 0 is 0, so this works well if no unwind info. */
1929 mod
->unwind_info
= unwind_add_table(mod
,
1930 (void *)sechdrs
[unwindex
].sh_addr
,
1931 sechdrs
[unwindex
].sh_size
);
1933 /* Get rid of temporary copy */
1940 module_arch_cleanup(mod
);
1942 module_unload_free(mod
);
1943 module_free(mod
, mod
->module_init
);
1945 module_free(mod
, mod
->module_core
);
1948 percpu_modfree(percpu
);
1953 return ERR_PTR(err
);
1956 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1962 * link the module with the whole machine is stopped with interrupts off
1963 * - this defends against kallsyms not taking locks
1965 static int __link_module(void *_mod
)
1967 struct module
*mod
= _mod
;
1968 list_add(&mod
->list
, &modules
);
1972 /* This is where the real work happens */
1974 sys_init_module(void __user
*umod
,
1976 const char __user
*uargs
)
1981 /* Must have permission */
1982 if (!capable(CAP_SYS_MODULE
))
1985 /* Only one module load at a time, please */
1986 if (mutex_lock_interruptible(&module_mutex
) != 0)
1989 /* Do all the hard work */
1990 mod
= load_module(umod
, len
, uargs
);
1992 mutex_unlock(&module_mutex
);
1993 return PTR_ERR(mod
);
1996 /* Now sew it into the lists. They won't access us, since
1997 strong_try_module_get() will fail. */
1998 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2000 /* Drop lock so they can recurse */
2001 mutex_unlock(&module_mutex
);
2003 blocking_notifier_call_chain(&module_notify_list
,
2004 MODULE_STATE_COMING
, mod
);
2006 /* Start the module */
2007 if (mod
->init
!= NULL
)
2010 /* Init routine failed: abort. Try to protect us from
2011 buggy refcounters. */
2012 mod
->state
= MODULE_STATE_GOING
;
2013 synchronize_sched();
2015 printk(KERN_ERR
"%s: module is now stuck!\n",
2019 mutex_lock(&module_mutex
);
2021 mutex_unlock(&module_mutex
);
2026 /* Now it's a first class citizen! */
2027 mutex_lock(&module_mutex
);
2028 mod
->state
= MODULE_STATE_LIVE
;
2029 /* Drop initial reference. */
2031 unwind_remove_table(mod
->unwind_info
, 1);
2032 module_free(mod
, mod
->module_init
);
2033 mod
->module_init
= NULL
;
2035 mod
->init_text_size
= 0;
2036 mutex_unlock(&module_mutex
);
2041 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2043 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2046 #ifdef CONFIG_KALLSYMS
2048 * This ignores the intensely annoying "mapping symbols" found
2049 * in ARM ELF files: $a, $t and $d.
2051 static inline int is_arm_mapping_symbol(const char *str
)
2053 return str
[0] == '$' && strchr("atd", str
[1])
2054 && (str
[2] == '\0' || str
[2] == '.');
2057 static const char *get_ksymbol(struct module
*mod
,
2059 unsigned long *size
,
2060 unsigned long *offset
)
2062 unsigned int i
, best
= 0;
2063 unsigned long nextval
;
2065 /* At worse, next value is at end of module */
2066 if (within(addr
, mod
->module_init
, mod
->init_size
))
2067 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2069 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2071 /* Scan for closest preceeding symbol, and next symbol. (ELF
2072 starts real symbols at 1). */
2073 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2074 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2077 /* We ignore unnamed symbols: they're uninformative
2078 * and inserted at a whim. */
2079 if (mod
->symtab
[i
].st_value
<= addr
2080 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2081 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2082 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2084 if (mod
->symtab
[i
].st_value
> addr
2085 && mod
->symtab
[i
].st_value
< nextval
2086 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2087 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2088 nextval
= mod
->symtab
[i
].st_value
;
2095 *size
= nextval
- mod
->symtab
[best
].st_value
;
2097 *offset
= addr
- mod
->symtab
[best
].st_value
;
2098 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2101 /* For kallsyms to ask for address resolution. NULL means not found.
2102 We don't lock, as this is used for oops resolution and races are a
2104 const char *module_address_lookup(unsigned long addr
,
2105 unsigned long *size
,
2106 unsigned long *offset
,
2111 list_for_each_entry(mod
, &modules
, list
) {
2112 if (within(addr
, mod
->module_init
, mod
->init_size
)
2113 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2115 *modname
= mod
->name
;
2116 return get_ksymbol(mod
, addr
, size
, offset
);
2122 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2126 mutex_lock(&module_mutex
);
2127 list_for_each_entry(mod
, &modules
, list
) {
2128 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2129 within(addr
, mod
->module_core
, mod
->core_size
)) {
2132 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2135 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2136 mutex_unlock(&module_mutex
);
2141 mutex_unlock(&module_mutex
);
2145 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2146 unsigned long *offset
, char *modname
, char *name
)
2150 mutex_lock(&module_mutex
);
2151 list_for_each_entry(mod
, &modules
, list
) {
2152 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2153 within(addr
, mod
->module_core
, mod
->core_size
)) {
2156 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2160 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2162 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2163 mutex_unlock(&module_mutex
);
2168 mutex_unlock(&module_mutex
);
2172 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2173 char *name
, char *module_name
, int *exported
)
2177 mutex_lock(&module_mutex
);
2178 list_for_each_entry(mod
, &modules
, list
) {
2179 if (symnum
< mod
->num_symtab
) {
2180 *value
= mod
->symtab
[symnum
].st_value
;
2181 *type
= mod
->symtab
[symnum
].st_info
;
2182 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2184 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2185 *exported
= is_exported(name
, mod
);
2186 mutex_unlock(&module_mutex
);
2189 symnum
-= mod
->num_symtab
;
2191 mutex_unlock(&module_mutex
);
2195 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2199 for (i
= 0; i
< mod
->num_symtab
; i
++)
2200 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2201 mod
->symtab
[i
].st_info
!= 'U')
2202 return mod
->symtab
[i
].st_value
;
2206 /* Look for this name: can be of form module:name. */
2207 unsigned long module_kallsyms_lookup_name(const char *name
)
2211 unsigned long ret
= 0;
2213 /* Don't lock: we're in enough trouble already. */
2214 if ((colon
= strchr(name
, ':')) != NULL
) {
2216 if ((mod
= find_module(name
)) != NULL
)
2217 ret
= mod_find_symname(mod
, colon
+1);
2220 list_for_each_entry(mod
, &modules
, list
)
2221 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2226 #endif /* CONFIG_KALLSYMS */
2228 /* Called by the /proc file system to return a list of modules. */
2229 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2231 mutex_lock(&module_mutex
);
2232 return seq_list_start(&modules
, *pos
);
2235 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2237 return seq_list_next(p
, &modules
, pos
);
2240 static void m_stop(struct seq_file
*m
, void *p
)
2242 mutex_unlock(&module_mutex
);
2245 static char *taint_flags(unsigned int taints
, char *buf
)
2251 if (taints
& TAINT_PROPRIETARY_MODULE
)
2253 if (taints
& TAINT_FORCED_MODULE
)
2256 * TAINT_FORCED_RMMOD: could be added.
2257 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2267 static int m_show(struct seq_file
*m
, void *p
)
2269 struct module
*mod
= list_entry(p
, struct module
, list
);
2272 seq_printf(m
, "%s %lu",
2273 mod
->name
, mod
->init_size
+ mod
->core_size
);
2274 print_unload_info(m
, mod
);
2276 /* Informative for users. */
2277 seq_printf(m
, " %s",
2278 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2279 mod
->state
== MODULE_STATE_COMING
? "Loading":
2281 /* Used by oprofile and other similar tools. */
2282 seq_printf(m
, " 0x%p", mod
->module_core
);
2286 seq_printf(m
, " %s", taint_flags(mod
->taints
, buf
));
2288 seq_printf(m
, "\n");
2292 /* Format: modulename size refcount deps address
2294 Where refcount is a number or -, and deps is a comma-separated list
2297 const struct seq_operations modules_op
= {
2304 /* Given an address, look for it in the module exception tables. */
2305 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2307 const struct exception_table_entry
*e
= NULL
;
2311 list_for_each_entry(mod
, &modules
, list
) {
2312 if (mod
->num_exentries
== 0)
2315 e
= search_extable(mod
->extable
,
2316 mod
->extable
+ mod
->num_exentries
- 1,
2323 /* Now, if we found one, we are running inside it now, hence
2324 we cannot unload the module, hence no refcnt needed. */
2329 * Is this a valid module address?
2331 int is_module_address(unsigned long addr
)
2337 list_for_each_entry(mod
, &modules
, list
) {
2338 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2350 /* Is this a valid kernel address? */
2351 struct module
*__module_text_address(unsigned long addr
)
2355 list_for_each_entry(mod
, &modules
, list
)
2356 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2357 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2362 struct module
*module_text_address(unsigned long addr
)
2367 mod
= __module_text_address(addr
);
2373 /* Don't grab lock, we're oopsing. */
2374 void print_modules(void)
2379 printk("Modules linked in:");
2380 list_for_each_entry(mod
, &modules
, list
)
2381 printk(" %s%s", mod
->name
, taint_flags(mod
->taints
, buf
));
2386 static char *make_driver_name(struct device_driver
*drv
)
2390 driver_name
= kmalloc(strlen(drv
->name
) + strlen(drv
->bus
->name
) + 2,
2395 sprintf(driver_name
, "%s:%s", drv
->bus
->name
, drv
->name
);
2399 static void module_create_drivers_dir(struct module_kobject
*mk
)
2401 if (!mk
|| mk
->drivers_dir
)
2404 mk
->drivers_dir
= kobject_add_dir(&mk
->kobj
, "drivers");
2407 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2411 struct module_kobject
*mk
= NULL
;
2418 else if (drv
->mod_name
) {
2419 struct kobject
*mkobj
;
2421 /* Lookup built-in module entry in /sys/modules */
2422 mkobj
= kset_find_obj(&module_subsys
, drv
->mod_name
);
2424 mk
= container_of(mkobj
, struct module_kobject
, kobj
);
2425 /* remember our module structure */
2427 /* kset_find_obj took a reference */
2435 /* Don't check return codes; these calls are idempotent */
2436 no_warn
= sysfs_create_link(&drv
->kobj
, &mk
->kobj
, "module");
2437 driver_name
= make_driver_name(drv
);
2439 module_create_drivers_dir(mk
);
2440 no_warn
= sysfs_create_link(mk
->drivers_dir
, &drv
->kobj
,
2445 EXPORT_SYMBOL(module_add_driver
);
2447 void module_remove_driver(struct device_driver
*drv
)
2449 struct module_kobject
*mk
= NULL
;
2455 sysfs_remove_link(&drv
->kobj
, "module");
2458 mk
= &drv
->owner
->mkobj
;
2459 else if (drv
->mkobj
)
2461 if (mk
&& mk
->drivers_dir
) {
2462 driver_name
= make_driver_name(drv
);
2464 sysfs_remove_link(mk
->drivers_dir
, driver_name
);
2469 EXPORT_SYMBOL(module_remove_driver
);
2472 #ifdef CONFIG_MODVERSIONS
2473 /* Generate the signature for struct module here, too, for modversions. */
2474 void struct_module(struct module
*mod
) { return; }
2475 EXPORT_SYMBOL(struct_module
);