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/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/vmalloc.h>
25 #include <linux/elf.h>
26 #include <linux/seq_file.h>
27 #include <linux/syscalls.h>
28 #include <linux/fcntl.h>
29 #include <linux/rcupdate.h>
30 #include <linux/capability.h>
31 #include <linux/cpu.h>
32 #include <linux/moduleparam.h>
33 #include <linux/errno.h>
34 #include <linux/err.h>
35 #include <linux/vermagic.h>
36 #include <linux/notifier.h>
37 #include <linux/sched.h>
38 #include <linux/stop_machine.h>
39 #include <linux/device.h>
40 #include <linux/string.h>
41 #include <linux/mutex.h>
42 #include <linux/unwind.h>
43 #include <asm/uaccess.h>
44 #include <asm/semaphore.h>
45 #include <asm/cacheflush.h>
46 #include <linux/license.h>
51 #define DEBUGP(fmt , a...)
54 #ifndef ARCH_SHF_SMALL
55 #define ARCH_SHF_SMALL 0
58 /* If this is set, the section belongs in the init part of the module */
59 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
61 /* Protects module list */
62 static DEFINE_SPINLOCK(modlist_lock
);
64 /* List of modules, protected by module_mutex AND modlist_lock */
65 static DEFINE_MUTEX(module_mutex
);
66 static LIST_HEAD(modules
);
68 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
70 int register_module_notifier(struct notifier_block
* nb
)
72 return blocking_notifier_chain_register(&module_notify_list
, nb
);
74 EXPORT_SYMBOL(register_module_notifier
);
76 int unregister_module_notifier(struct notifier_block
* nb
)
78 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
80 EXPORT_SYMBOL(unregister_module_notifier
);
82 /* We require a truly strong try_module_get() */
83 static inline int strong_try_module_get(struct module
*mod
)
85 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
87 return try_module_get(mod
);
90 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
96 /* A thread that wants to hold a reference to a module only while it
97 * is running can call ths to safely exit.
98 * nfsd and lockd use this.
100 void __module_put_and_exit(struct module
*mod
, long code
)
105 EXPORT_SYMBOL(__module_put_and_exit
);
107 /* Find a module section: 0 means not found. */
108 static unsigned int find_sec(Elf_Ehdr
*hdr
,
110 const char *secstrings
,
115 for (i
= 1; i
< hdr
->e_shnum
; i
++)
116 /* Alloc bit cleared means "ignore it." */
117 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
118 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
123 /* Provided by the linker */
124 extern const struct kernel_symbol __start___ksymtab
[];
125 extern const struct kernel_symbol __stop___ksymtab
[];
126 extern const struct kernel_symbol __start___ksymtab_gpl
[];
127 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
128 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
129 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
130 extern const struct kernel_symbol __start___ksymtab_unused
[];
131 extern const struct kernel_symbol __stop___ksymtab_unused
[];
132 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
133 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
134 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
135 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
136 extern const unsigned long __start___kcrctab
[];
137 extern const unsigned long __start___kcrctab_gpl
[];
138 extern const unsigned long __start___kcrctab_gpl_future
[];
139 extern const unsigned long __start___kcrctab_unused
[];
140 extern const unsigned long __start___kcrctab_unused_gpl
[];
142 #ifndef CONFIG_MODVERSIONS
143 #define symversion(base, idx) NULL
145 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
148 /* lookup symbol in given range of kernel_symbols */
149 static const struct kernel_symbol
*lookup_symbol(const char *name
,
150 const struct kernel_symbol
*start
,
151 const struct kernel_symbol
*stop
)
153 const struct kernel_symbol
*ks
= start
;
154 for (; ks
< stop
; ks
++)
155 if (strcmp(ks
->name
, name
) == 0)
160 static void printk_unused_warning(const char *name
)
162 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
163 "however this module is using it.\n", name
);
164 printk(KERN_WARNING
"This symbol will go away in the future.\n");
165 printk(KERN_WARNING
"Please evalute if this is the right api to use, "
166 "and if it really is, submit a report the linux kernel "
167 "mailinglist together with submitting your code for "
171 /* Find a symbol, return value, crc and module which owns it */
172 static unsigned long __find_symbol(const char *name
,
173 struct module
**owner
,
174 const unsigned long **crc
,
178 const struct kernel_symbol
*ks
;
180 /* Core kernel first. */
182 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
184 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
188 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
189 __stop___ksymtab_gpl
);
191 *crc
= symversion(__start___kcrctab_gpl
,
192 (ks
- __start___ksymtab_gpl
));
196 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
197 __stop___ksymtab_gpl_future
);
200 printk(KERN_WARNING
"Symbol %s is being used "
201 "by a non-GPL module, which will not "
202 "be allowed in the future\n", name
);
203 printk(KERN_WARNING
"Please see the file "
204 "Documentation/feature-removal-schedule.txt "
205 "in the kernel source tree for more "
208 *crc
= symversion(__start___kcrctab_gpl_future
,
209 (ks
- __start___ksymtab_gpl_future
));
213 ks
= lookup_symbol(name
, __start___ksymtab_unused
,
214 __stop___ksymtab_unused
);
216 printk_unused_warning(name
);
217 *crc
= symversion(__start___kcrctab_unused
,
218 (ks
- __start___ksymtab_unused
));
223 ks
= lookup_symbol(name
, __start___ksymtab_unused_gpl
,
224 __stop___ksymtab_unused_gpl
);
226 printk_unused_warning(name
);
227 *crc
= symversion(__start___kcrctab_unused_gpl
,
228 (ks
- __start___ksymtab_unused_gpl
));
232 /* Now try modules. */
233 list_for_each_entry(mod
, &modules
, list
) {
235 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
237 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
242 ks
= lookup_symbol(name
, mod
->gpl_syms
,
243 mod
->gpl_syms
+ mod
->num_gpl_syms
);
245 *crc
= symversion(mod
->gpl_crcs
,
246 (ks
- mod
->gpl_syms
));
250 ks
= lookup_symbol(name
, mod
->unused_syms
, mod
->unused_syms
+ mod
->num_unused_syms
);
252 printk_unused_warning(name
);
253 *crc
= symversion(mod
->unused_crcs
, (ks
- mod
->unused_syms
));
258 ks
= lookup_symbol(name
, mod
->unused_gpl_syms
,
259 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
);
261 printk_unused_warning(name
);
262 *crc
= symversion(mod
->unused_gpl_crcs
,
263 (ks
- mod
->unused_gpl_syms
));
267 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
268 (mod
->gpl_future_syms
+
269 mod
->num_gpl_future_syms
));
272 printk(KERN_WARNING
"Symbol %s is being used "
273 "by a non-GPL module, which will not "
274 "be allowed in the future\n", name
);
275 printk(KERN_WARNING
"Please see the file "
276 "Documentation/feature-removal-schedule.txt "
277 "in the kernel source tree for more "
280 *crc
= symversion(mod
->gpl_future_crcs
,
281 (ks
- mod
->gpl_future_syms
));
285 DEBUGP("Failed to find symbol %s\n", name
);
289 /* Search for module by name: must hold module_mutex. */
290 static struct module
*find_module(const char *name
)
294 list_for_each_entry(mod
, &modules
, list
) {
295 if (strcmp(mod
->name
, name
) == 0)
302 /* Number of blocks used and allocated. */
303 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
304 /* Size of each block. -ve means used. */
305 static int *pcpu_size
;
307 static int split_block(unsigned int i
, unsigned short size
)
309 /* Reallocation required? */
310 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
311 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
316 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
317 pcpu_num_allocated
*= 2;
322 /* Insert a new subblock */
323 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
324 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
327 pcpu_size
[i
+1] -= size
;
332 static inline unsigned int block_size(int val
)
339 /* Created by linker magic */
340 extern char __per_cpu_start
[], __per_cpu_end
[];
342 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
349 if (align
> SMP_CACHE_BYTES
) {
350 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
351 name
, align
, SMP_CACHE_BYTES
);
352 align
= SMP_CACHE_BYTES
;
355 ptr
= __per_cpu_start
;
356 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
357 /* Extra for alignment requirement. */
358 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
359 BUG_ON(i
== 0 && extra
!= 0);
361 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
364 /* Transfer extra to previous block. */
365 if (pcpu_size
[i
-1] < 0)
366 pcpu_size
[i
-1] -= extra
;
368 pcpu_size
[i
-1] += extra
;
369 pcpu_size
[i
] -= extra
;
372 /* Split block if warranted */
373 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
374 if (!split_block(i
, size
))
378 pcpu_size
[i
] = -pcpu_size
[i
];
382 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
387 static void percpu_modfree(void *freeme
)
390 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
392 /* First entry is core kernel percpu data. */
393 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
395 pcpu_size
[i
] = -pcpu_size
[i
];
402 /* Merge with previous? */
403 if (pcpu_size
[i
-1] >= 0) {
404 pcpu_size
[i
-1] += pcpu_size
[i
];
406 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
407 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
410 /* Merge with next? */
411 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
412 pcpu_size
[i
] += pcpu_size
[i
+1];
414 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
415 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
419 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
421 const char *secstrings
)
423 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
426 static int percpu_modinit(void)
429 pcpu_num_allocated
= 2;
430 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
432 /* Static in-kernel percpu data (used). */
433 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
435 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
436 if (pcpu_size
[1] < 0) {
437 printk(KERN_ERR
"No per-cpu room for modules.\n");
443 __initcall(percpu_modinit
);
444 #else /* ... !CONFIG_SMP */
445 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
450 static inline void percpu_modfree(void *pcpuptr
)
454 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
456 const char *secstrings
)
460 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
463 /* pcpusec should be 0, and size of that section should be 0. */
466 #endif /* CONFIG_SMP */
468 #define MODINFO_ATTR(field) \
469 static void setup_modinfo_##field(struct module *mod, const char *s) \
471 mod->field = kstrdup(s, GFP_KERNEL); \
473 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
474 struct module *mod, char *buffer) \
476 return sprintf(buffer, "%s\n", mod->field); \
478 static int modinfo_##field##_exists(struct module *mod) \
480 return mod->field != NULL; \
482 static void free_modinfo_##field(struct module *mod) \
487 static struct module_attribute modinfo_##field = { \
488 .attr = { .name = __stringify(field), .mode = 0444, \
489 .owner = THIS_MODULE }, \
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
;
762 const unsigned long *crc
;
764 spin_lock_irqsave(&modlist_lock
, flags
);
765 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
768 spin_unlock_irqrestore(&modlist_lock
, flags
);
770 EXPORT_SYMBOL(__symbol_put
);
772 void symbol_put_addr(void *addr
)
774 struct module
*modaddr
;
776 if (core_kernel_text((unsigned long)addr
))
779 if (!(modaddr
= module_text_address((unsigned long)addr
)))
783 EXPORT_SYMBOL_GPL(symbol_put_addr
);
785 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
786 struct module
*mod
, char *buffer
)
788 /* sysfs holds a reference */
789 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
792 static struct module_attribute refcnt
= {
793 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
797 void module_put(struct module
*module
)
800 unsigned int cpu
= get_cpu();
801 local_dec(&module
->ref
[cpu
].count
);
802 /* Maybe they're waiting for us to drop reference? */
803 if (unlikely(!module_is_live(module
)))
804 wake_up_process(module
->waiter
);
808 EXPORT_SYMBOL(module_put
);
810 #else /* !CONFIG_MODULE_UNLOAD */
811 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
813 /* We don't know the usage count, or what modules are using. */
814 seq_printf(m
, " - -");
817 static inline void module_unload_free(struct module
*mod
)
821 static inline int use_module(struct module
*a
, struct module
*b
)
823 return strong_try_module_get(b
);
826 static inline void module_unload_init(struct module
*mod
)
829 #endif /* CONFIG_MODULE_UNLOAD */
831 static ssize_t
show_initstate(struct module_attribute
*mattr
,
832 struct module
*mod
, char *buffer
)
834 const char *state
= "unknown";
836 switch (mod
->state
) {
837 case MODULE_STATE_LIVE
:
840 case MODULE_STATE_COMING
:
843 case MODULE_STATE_GOING
:
847 return sprintf(buffer
, "%s\n", state
);
850 static struct module_attribute initstate
= {
851 .attr
= { .name
= "initstate", .mode
= 0444, .owner
= THIS_MODULE
},
852 .show
= show_initstate
,
855 static struct module_attribute
*modinfo_attrs
[] = {
859 #ifdef CONFIG_MODULE_UNLOAD
865 static const char vermagic
[] = VERMAGIC_STRING
;
867 #ifdef CONFIG_MODVERSIONS
868 static int check_version(Elf_Shdr
*sechdrs
,
869 unsigned int versindex
,
872 const unsigned long *crc
)
874 unsigned int i
, num_versions
;
875 struct modversion_info
*versions
;
877 /* Exporting module didn't supply crcs? OK, we're already tainted. */
881 versions
= (void *) sechdrs
[versindex
].sh_addr
;
882 num_versions
= sechdrs
[versindex
].sh_size
883 / sizeof(struct modversion_info
);
885 for (i
= 0; i
< num_versions
; i
++) {
886 if (strcmp(versions
[i
].name
, symname
) != 0)
889 if (versions
[i
].crc
== *crc
)
891 printk("%s: disagrees about version of symbol %s\n",
893 DEBUGP("Found checksum %lX vs module %lX\n",
894 *crc
, versions
[i
].crc
);
897 /* Not in module's version table. OK, but that taints the kernel. */
898 if (!(tainted
& TAINT_FORCED_MODULE
))
899 printk("%s: no version for \"%s\" found: kernel tainted.\n",
901 add_taint_module(mod
, TAINT_FORCED_MODULE
);
905 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
906 unsigned int versindex
,
909 const unsigned long *crc
;
910 struct module
*owner
;
912 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
914 return check_version(sechdrs
, versindex
, "struct_module", mod
,
918 /* First part is kernel version, which we ignore. */
919 static inline int same_magic(const char *amagic
, const char *bmagic
)
921 amagic
+= strcspn(amagic
, " ");
922 bmagic
+= strcspn(bmagic
, " ");
923 return strcmp(amagic
, bmagic
) == 0;
926 static inline int check_version(Elf_Shdr
*sechdrs
,
927 unsigned int versindex
,
930 const unsigned long *crc
)
935 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
936 unsigned int versindex
,
942 static inline int same_magic(const char *amagic
, const char *bmagic
)
944 return strcmp(amagic
, bmagic
) == 0;
946 #endif /* CONFIG_MODVERSIONS */
948 /* Resolve a symbol for this module. I.e. if we find one, record usage.
949 Must be holding module_mutex. */
950 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
951 unsigned int versindex
,
955 struct module
*owner
;
957 const unsigned long *crc
;
959 ret
= __find_symbol(name
, &owner
, &crc
,
960 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
));
962 /* use_module can fail due to OOM, or module unloading */
963 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
964 !use_module(mod
, owner
))
972 * /sys/module/foo/sections stuff
973 * J. Corbet <corbet@lwn.net>
975 #ifdef CONFIG_KALLSYMS
976 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
977 struct module
*mod
, char *buf
)
979 struct module_sect_attr
*sattr
=
980 container_of(mattr
, struct module_sect_attr
, mattr
);
981 return sprintf(buf
, "0x%lx\n", sattr
->address
);
984 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
988 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
989 kfree(sect_attrs
->attrs
[section
].name
);
993 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
994 char *secstrings
, Elf_Shdr
*sechdrs
)
996 unsigned int nloaded
= 0, i
, size
[2];
997 struct module_sect_attrs
*sect_attrs
;
998 struct module_sect_attr
*sattr
;
999 struct attribute
**gattr
;
1001 /* Count loaded sections and allocate structures */
1002 for (i
= 0; i
< nsect
; i
++)
1003 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1005 size
[0] = ALIGN(sizeof(*sect_attrs
)
1006 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1007 sizeof(sect_attrs
->grp
.attrs
[0]));
1008 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1009 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1010 if (sect_attrs
== NULL
)
1013 /* Setup section attributes. */
1014 sect_attrs
->grp
.name
= "sections";
1015 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1017 sect_attrs
->nsections
= 0;
1018 sattr
= §_attrs
->attrs
[0];
1019 gattr
= §_attrs
->grp
.attrs
[0];
1020 for (i
= 0; i
< nsect
; i
++) {
1021 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1023 sattr
->address
= sechdrs
[i
].sh_addr
;
1024 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1026 if (sattr
->name
== NULL
)
1028 sect_attrs
->nsections
++;
1029 sattr
->mattr
.show
= module_sect_show
;
1030 sattr
->mattr
.store
= NULL
;
1031 sattr
->mattr
.attr
.name
= sattr
->name
;
1032 sattr
->mattr
.attr
.owner
= mod
;
1033 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1034 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1038 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1041 mod
->sect_attrs
= sect_attrs
;
1044 free_sect_attrs(sect_attrs
);
1047 static void remove_sect_attrs(struct module
*mod
)
1049 if (mod
->sect_attrs
) {
1050 sysfs_remove_group(&mod
->mkobj
.kobj
,
1051 &mod
->sect_attrs
->grp
);
1052 /* We are positive that no one is using any sect attrs
1053 * at this point. Deallocate immediately. */
1054 free_sect_attrs(mod
->sect_attrs
);
1055 mod
->sect_attrs
= NULL
;
1061 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1062 char *sectstrings
, Elf_Shdr
*sechdrs
)
1066 static inline void remove_sect_attrs(struct module
*mod
)
1069 #endif /* CONFIG_KALLSYMS */
1071 static int module_add_modinfo_attrs(struct module
*mod
)
1073 struct module_attribute
*attr
;
1074 struct module_attribute
*temp_attr
;
1078 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1079 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1081 if (!mod
->modinfo_attrs
)
1084 temp_attr
= mod
->modinfo_attrs
;
1085 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1087 (attr
->test
&& attr
->test(mod
))) {
1088 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1089 temp_attr
->attr
.owner
= mod
;
1090 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1097 static void module_remove_modinfo_attrs(struct module
*mod
)
1099 struct module_attribute
*attr
;
1102 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1103 /* pick a field to test for end of list */
1104 if (!attr
->attr
.name
)
1106 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1110 kfree(mod
->modinfo_attrs
);
1113 static int mod_sysfs_init(struct module
*mod
)
1117 if (!module_subsys
.kset
.subsys
) {
1118 printk(KERN_ERR
"%s: module_subsys not initialized\n",
1123 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1124 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1127 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1128 mod
->mkobj
.mod
= mod
;
1130 kobject_init(&mod
->mkobj
.kobj
);
1136 static int mod_sysfs_setup(struct module
*mod
,
1137 struct kernel_param
*kparam
,
1138 unsigned int num_params
)
1142 /* delay uevent until full sysfs population */
1143 err
= kobject_add(&mod
->mkobj
.kobj
);
1147 mod
->holders_dir
= kobject_add_dir(&mod
->mkobj
.kobj
, "holders");
1148 if (!mod
->holders_dir
)
1151 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1153 goto out_unreg_holders
;
1155 err
= module_add_modinfo_attrs(mod
);
1157 goto out_unreg_param
;
1159 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1163 module_param_sysfs_remove(mod
);
1165 kobject_unregister(mod
->holders_dir
);
1167 kobject_del(&mod
->mkobj
.kobj
);
1168 kobject_put(&mod
->mkobj
.kobj
);
1173 static void mod_kobject_remove(struct module
*mod
)
1175 module_remove_modinfo_attrs(mod
);
1176 module_param_sysfs_remove(mod
);
1177 if (mod
->mkobj
.drivers_dir
)
1178 kobject_unregister(mod
->mkobj
.drivers_dir
);
1179 if (mod
->holders_dir
)
1180 kobject_unregister(mod
->holders_dir
);
1182 kobject_unregister(&mod
->mkobj
.kobj
);
1186 * unlink the module with the whole machine is stopped with interrupts off
1187 * - this defends against kallsyms not taking locks
1189 static int __unlink_module(void *_mod
)
1191 struct module
*mod
= _mod
;
1192 list_del(&mod
->list
);
1196 /* Free a module, remove from lists, etc (must hold module mutex). */
1197 static void free_module(struct module
*mod
)
1199 /* Delete from various lists */
1200 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1201 remove_sect_attrs(mod
);
1202 mod_kobject_remove(mod
);
1204 unwind_remove_table(mod
->unwind_info
, 0);
1206 /* Arch-specific cleanup. */
1207 module_arch_cleanup(mod
);
1209 /* Module unload stuff */
1210 module_unload_free(mod
);
1212 /* This may be NULL, but that's OK */
1213 module_free(mod
, mod
->module_init
);
1216 percpu_modfree(mod
->percpu
);
1218 /* Free lock-classes: */
1219 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1221 /* Finally, free the core (containing the module structure) */
1222 module_free(mod
, mod
->module_core
);
1225 void *__symbol_get(const char *symbol
)
1227 struct module
*owner
;
1228 unsigned long value
, flags
;
1229 const unsigned long *crc
;
1231 spin_lock_irqsave(&modlist_lock
, flags
);
1232 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1233 if (value
&& !strong_try_module_get(owner
))
1235 spin_unlock_irqrestore(&modlist_lock
, flags
);
1237 return (void *)value
;
1239 EXPORT_SYMBOL_GPL(__symbol_get
);
1242 * Ensure that an exported symbol [global namespace] does not already exist
1243 * in the Kernel or in some other modules exported symbol table.
1245 static int verify_export_symbols(struct module
*mod
)
1247 const char *name
= NULL
;
1248 unsigned long i
, ret
= 0;
1249 struct module
*owner
;
1250 const unsigned long *crc
;
1252 for (i
= 0; i
< mod
->num_syms
; i
++)
1253 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1254 name
= mod
->syms
[i
].name
;
1259 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1260 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1261 name
= mod
->gpl_syms
[i
].name
;
1268 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1269 mod
->name
, name
, module_name(owner
));
1274 /* Change all symbols so that sh_value encodes the pointer directly. */
1275 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1276 unsigned int symindex
,
1278 unsigned int versindex
,
1279 unsigned int pcpuindex
,
1282 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1283 unsigned long secbase
;
1284 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1287 for (i
= 1; i
< n
; i
++) {
1288 switch (sym
[i
].st_shndx
) {
1290 /* We compiled with -fno-common. These are not
1291 supposed to happen. */
1292 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1293 printk("%s: please compile with -fno-common\n",
1299 /* Don't need to do anything */
1300 DEBUGP("Absolute symbol: 0x%08lx\n",
1301 (long)sym
[i
].st_value
);
1306 = resolve_symbol(sechdrs
, versindex
,
1307 strtab
+ sym
[i
].st_name
, mod
);
1309 /* Ok if resolved. */
1310 if (sym
[i
].st_value
!= 0)
1313 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1316 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1317 mod
->name
, strtab
+ sym
[i
].st_name
);
1322 /* Divert to percpu allocation if a percpu var. */
1323 if (sym
[i
].st_shndx
== pcpuindex
)
1324 secbase
= (unsigned long)mod
->percpu
;
1326 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1327 sym
[i
].st_value
+= secbase
;
1335 /* Update size with this section: return offset. */
1336 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1340 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1341 *size
= ret
+ sechdr
->sh_size
;
1345 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1346 might -- code, read-only data, read-write data, small data. Tally
1347 sizes, and place the offsets into sh_entsize fields: high bit means it
1349 static void layout_sections(struct module
*mod
,
1350 const Elf_Ehdr
*hdr
,
1352 const char *secstrings
)
1354 static unsigned long const masks
[][2] = {
1355 /* NOTE: all executable code must be the first section
1356 * in this array; otherwise modify the text_size
1357 * finder in the two loops below */
1358 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1359 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1360 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1361 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1365 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1366 sechdrs
[i
].sh_entsize
= ~0UL;
1368 DEBUGP("Core section allocation order:\n");
1369 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1370 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1371 Elf_Shdr
*s
= &sechdrs
[i
];
1373 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1374 || (s
->sh_flags
& masks
[m
][1])
1375 || s
->sh_entsize
!= ~0UL
1376 || strncmp(secstrings
+ s
->sh_name
,
1379 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1380 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1383 mod
->core_text_size
= mod
->core_size
;
1386 DEBUGP("Init section allocation order:\n");
1387 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1388 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1389 Elf_Shdr
*s
= &sechdrs
[i
];
1391 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1392 || (s
->sh_flags
& masks
[m
][1])
1393 || s
->sh_entsize
!= ~0UL
1394 || strncmp(secstrings
+ s
->sh_name
,
1397 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1398 | INIT_OFFSET_MASK
);
1399 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1402 mod
->init_text_size
= mod
->init_size
;
1406 static void set_license(struct module
*mod
, const char *license
)
1409 license
= "unspecified";
1411 if (!license_is_gpl_compatible(license
)) {
1412 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1413 printk(KERN_WARNING
"%s: module license '%s' taints "
1414 "kernel.\n", mod
->name
, license
);
1415 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1419 /* Parse tag=value strings from .modinfo section */
1420 static char *next_string(char *string
, unsigned long *secsize
)
1422 /* Skip non-zero chars */
1425 if ((*secsize
)-- <= 1)
1429 /* Skip any zero padding. */
1430 while (!string
[0]) {
1432 if ((*secsize
)-- <= 1)
1438 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1443 unsigned int taglen
= strlen(tag
);
1444 unsigned long size
= sechdrs
[info
].sh_size
;
1446 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1447 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1448 return p
+ taglen
+ 1;
1453 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1454 unsigned int infoindex
)
1456 struct module_attribute
*attr
;
1459 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1462 get_modinfo(sechdrs
,
1468 #ifdef CONFIG_KALLSYMS
1469 int is_exported(const char *name
, const struct module
*mod
)
1471 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1474 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1481 static char elf_type(const Elf_Sym
*sym
,
1483 const char *secstrings
,
1486 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1487 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1492 if (sym
->st_shndx
== SHN_UNDEF
)
1494 if (sym
->st_shndx
== SHN_ABS
)
1496 if (sym
->st_shndx
>= SHN_LORESERVE
)
1498 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1500 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1501 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1502 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1504 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1509 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1510 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1515 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1516 ".debug", strlen(".debug")) == 0)
1521 static void add_kallsyms(struct module
*mod
,
1523 unsigned int symindex
,
1524 unsigned int strindex
,
1525 const char *secstrings
)
1529 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1530 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1531 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1533 /* Set types up while we still have access to sections. */
1534 for (i
= 0; i
< mod
->num_symtab
; i
++)
1535 mod
->symtab
[i
].st_info
1536 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1539 static inline void add_kallsyms(struct module
*mod
,
1541 unsigned int symindex
,
1542 unsigned int strindex
,
1543 const char *secstrings
)
1546 #endif /* CONFIG_KALLSYMS */
1548 /* Allocate and load the module: note that size of section 0 is always
1549 zero, and we rely on this for optional sections. */
1550 static struct module
*load_module(void __user
*umod
,
1552 const char __user
*uargs
)
1556 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1558 unsigned int symindex
= 0;
1559 unsigned int strindex
= 0;
1560 unsigned int setupindex
;
1561 unsigned int exindex
;
1562 unsigned int exportindex
;
1563 unsigned int modindex
;
1564 unsigned int obsparmindex
;
1565 unsigned int infoindex
;
1566 unsigned int gplindex
;
1567 unsigned int crcindex
;
1568 unsigned int gplcrcindex
;
1569 unsigned int versindex
;
1570 unsigned int pcpuindex
;
1571 unsigned int gplfutureindex
;
1572 unsigned int gplfuturecrcindex
;
1573 unsigned int unwindex
= 0;
1574 unsigned int unusedindex
;
1575 unsigned int unusedcrcindex
;
1576 unsigned int unusedgplindex
;
1577 unsigned int unusedgplcrcindex
;
1580 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1581 struct exception_table_entry
*extable
;
1582 mm_segment_t old_fs
;
1584 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1586 if (len
< sizeof(*hdr
))
1587 return ERR_PTR(-ENOEXEC
);
1589 /* Suck in entire file: we'll want most of it. */
1590 /* vmalloc barfs on "unusual" numbers. Check here */
1591 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1592 return ERR_PTR(-ENOMEM
);
1593 if (copy_from_user(hdr
, umod
, len
) != 0) {
1598 /* Sanity checks against insmoding binaries or wrong arch,
1599 weird elf version */
1600 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1601 || hdr
->e_type
!= ET_REL
1602 || !elf_check_arch(hdr
)
1603 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1608 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1611 /* Convenience variables */
1612 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1613 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1614 sechdrs
[0].sh_addr
= 0;
1616 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1617 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1618 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1621 /* Mark all sections sh_addr with their address in the
1623 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1625 /* Internal symbols and strings. */
1626 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1628 strindex
= sechdrs
[i
].sh_link
;
1629 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1631 #ifndef CONFIG_MODULE_UNLOAD
1632 /* Don't load .exit sections */
1633 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1634 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1638 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1639 ".gnu.linkonce.this_module");
1641 printk(KERN_WARNING
"No module found in object\n");
1645 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1647 if (symindex
== 0) {
1648 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1654 /* Optional sections */
1655 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1656 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1657 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1658 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1659 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1660 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1661 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1662 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1663 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1664 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1665 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1666 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1667 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1668 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1669 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1670 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1671 #ifdef ARCH_UNWIND_SECTION_NAME
1672 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1675 /* Don't keep modinfo section */
1676 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1677 #ifdef CONFIG_KALLSYMS
1678 /* Keep symbol and string tables for decoding later. */
1679 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1680 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1683 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1685 /* Check module struct version now, before we try to use module. */
1686 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1691 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1692 /* This is allowed: modprobe --force will invalidate it. */
1694 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1695 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1697 } else if (!same_magic(modmagic
, vermagic
)) {
1698 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1699 mod
->name
, modmagic
, vermagic
);
1704 /* Now copy in args */
1705 args
= strndup_user(uargs
, ~0UL >> 1);
1707 err
= PTR_ERR(args
);
1711 if (find_module(mod
->name
)) {
1716 mod
->state
= MODULE_STATE_COMING
;
1718 /* Allow arches to frob section contents and sizes. */
1719 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1724 /* We have a special allocation for this section. */
1725 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1726 sechdrs
[pcpuindex
].sh_addralign
,
1732 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1733 mod
->percpu
= percpu
;
1736 /* Determine total sizes, and put offsets in sh_entsize. For now
1737 this is done generically; there doesn't appear to be any
1738 special cases for the architectures. */
1739 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1741 /* Do the allocs. */
1742 ptr
= module_alloc(mod
->core_size
);
1747 memset(ptr
, 0, mod
->core_size
);
1748 mod
->module_core
= ptr
;
1750 ptr
= module_alloc(mod
->init_size
);
1751 if (!ptr
&& mod
->init_size
) {
1755 memset(ptr
, 0, mod
->init_size
);
1756 mod
->module_init
= ptr
;
1758 /* Transfer each section which specifies SHF_ALLOC */
1759 DEBUGP("final section addresses:\n");
1760 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1763 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1766 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1767 dest
= mod
->module_init
1768 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1770 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1772 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1773 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1774 sechdrs
[i
].sh_size
);
1775 /* Update sh_addr to point to copy in image. */
1776 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1777 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1779 /* Module has been moved. */
1780 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1782 /* Now we've moved module, initialize linked lists, etc. */
1783 module_unload_init(mod
);
1785 /* Initialize kobject, so we can reference it. */
1786 if (mod_sysfs_init(mod
) != 0)
1789 /* Set up license info based on the info section */
1790 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1792 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1793 add_taint(TAINT_PROPRIETARY_MODULE
);
1794 if (strcmp(mod
->name
, "driverloader") == 0)
1795 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1797 /* Set up MODINFO_ATTR fields */
1798 setup_modinfo(mod
, sechdrs
, infoindex
);
1800 /* Fix up syms, so that st_value is a pointer to location. */
1801 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1806 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1807 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1808 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1810 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1811 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1812 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1814 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1815 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1816 sizeof(*mod
->gpl_future_syms
);
1817 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1818 sizeof(*mod
->unused_syms
);
1819 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1820 sizeof(*mod
->unused_gpl_syms
);
1821 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1822 if (gplfuturecrcindex
)
1823 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1825 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1827 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1828 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1829 if (unusedgplcrcindex
)
1830 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1832 #ifdef CONFIG_MODVERSIONS
1833 if ((mod
->num_syms
&& !crcindex
) ||
1834 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1835 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1836 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1837 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1838 printk(KERN_WARNING
"%s: No versions for exported symbols."
1839 " Tainting kernel.\n", mod
->name
);
1840 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1844 /* Now do relocations. */
1845 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1846 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1847 unsigned int info
= sechdrs
[i
].sh_info
;
1849 /* Not a valid relocation section? */
1850 if (info
>= hdr
->e_shnum
)
1853 /* Don't bother with non-allocated sections */
1854 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1857 if (sechdrs
[i
].sh_type
== SHT_REL
)
1858 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1859 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1860 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1866 /* Find duplicate symbols */
1867 err
= verify_export_symbols(mod
);
1872 /* Set up and sort exception table */
1873 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1874 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1875 sort_extable(extable
, extable
+ mod
->num_exentries
);
1877 /* Finally, copy percpu area over. */
1878 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1879 sechdrs
[pcpuindex
].sh_size
);
1881 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1883 err
= module_finalize(hdr
, sechdrs
, mod
);
1887 /* flush the icache in correct context */
1892 * Flush the instruction cache, since we've played with text.
1893 * Do it before processing of module parameters, so the module
1894 * can provide parameter accessor functions of its own.
1896 if (mod
->module_init
)
1897 flush_icache_range((unsigned long)mod
->module_init
,
1898 (unsigned long)mod
->module_init
1900 flush_icache_range((unsigned long)mod
->module_core
,
1901 (unsigned long)mod
->module_core
+ mod
->core_size
);
1907 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
1910 /* Size of section 0 is 0, so this works well if no params */
1911 err
= parse_args(mod
->name
, mod
->args
,
1912 (struct kernel_param
*)
1913 sechdrs
[setupindex
].sh_addr
,
1914 sechdrs
[setupindex
].sh_size
1915 / sizeof(struct kernel_param
),
1920 err
= mod_sysfs_setup(mod
,
1921 (struct kernel_param
*)
1922 sechdrs
[setupindex
].sh_addr
,
1923 sechdrs
[setupindex
].sh_size
1924 / sizeof(struct kernel_param
));
1927 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1929 /* Size of section 0 is 0, so this works well if no unwind info. */
1930 mod
->unwind_info
= unwind_add_table(mod
,
1931 (void *)sechdrs
[unwindex
].sh_addr
,
1932 sechdrs
[unwindex
].sh_size
);
1934 /* Get rid of temporary copy */
1941 module_arch_cleanup(mod
);
1943 module_unload_free(mod
);
1944 module_free(mod
, mod
->module_init
);
1946 module_free(mod
, mod
->module_core
);
1949 percpu_modfree(percpu
);
1954 return ERR_PTR(err
);
1957 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1963 * link the module with the whole machine is stopped with interrupts off
1964 * - this defends against kallsyms not taking locks
1966 static int __link_module(void *_mod
)
1968 struct module
*mod
= _mod
;
1969 list_add(&mod
->list
, &modules
);
1973 /* This is where the real work happens */
1975 sys_init_module(void __user
*umod
,
1977 const char __user
*uargs
)
1982 /* Must have permission */
1983 if (!capable(CAP_SYS_MODULE
))
1986 /* Only one module load at a time, please */
1987 if (mutex_lock_interruptible(&module_mutex
) != 0)
1990 /* Do all the hard work */
1991 mod
= load_module(umod
, len
, uargs
);
1993 mutex_unlock(&module_mutex
);
1994 return PTR_ERR(mod
);
1997 /* Now sew it into the lists. They won't access us, since
1998 strong_try_module_get() will fail. */
1999 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2001 /* Drop lock so they can recurse */
2002 mutex_unlock(&module_mutex
);
2004 blocking_notifier_call_chain(&module_notify_list
,
2005 MODULE_STATE_COMING
, mod
);
2007 /* Start the module */
2008 if (mod
->init
!= NULL
)
2011 /* Init routine failed: abort. Try to protect us from
2012 buggy refcounters. */
2013 mod
->state
= MODULE_STATE_GOING
;
2014 synchronize_sched();
2016 printk(KERN_ERR
"%s: module is now stuck!\n",
2020 mutex_lock(&module_mutex
);
2022 mutex_unlock(&module_mutex
);
2027 /* Now it's a first class citizen! */
2028 mutex_lock(&module_mutex
);
2029 mod
->state
= MODULE_STATE_LIVE
;
2030 /* Drop initial reference. */
2032 unwind_remove_table(mod
->unwind_info
, 1);
2033 module_free(mod
, mod
->module_init
);
2034 mod
->module_init
= NULL
;
2036 mod
->init_text_size
= 0;
2037 mutex_unlock(&module_mutex
);
2042 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2044 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2047 #ifdef CONFIG_KALLSYMS
2049 * This ignores the intensely annoying "mapping symbols" found
2050 * in ARM ELF files: $a, $t and $d.
2052 static inline int is_arm_mapping_symbol(const char *str
)
2054 return str
[0] == '$' && strchr("atd", str
[1])
2055 && (str
[2] == '\0' || str
[2] == '.');
2058 static const char *get_ksymbol(struct module
*mod
,
2060 unsigned long *size
,
2061 unsigned long *offset
)
2063 unsigned int i
, best
= 0;
2064 unsigned long nextval
;
2066 /* At worse, next value is at end of module */
2067 if (within(addr
, mod
->module_init
, mod
->init_size
))
2068 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2070 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2072 /* Scan for closest preceeding symbol, and next symbol. (ELF
2073 starts real symbols at 1). */
2074 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2075 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2078 /* We ignore unnamed symbols: they're uninformative
2079 * and inserted at a whim. */
2080 if (mod
->symtab
[i
].st_value
<= addr
2081 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2082 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2083 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2085 if (mod
->symtab
[i
].st_value
> addr
2086 && mod
->symtab
[i
].st_value
< nextval
2087 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2088 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2089 nextval
= mod
->symtab
[i
].st_value
;
2095 *size
= nextval
- mod
->symtab
[best
].st_value
;
2096 *offset
= addr
- mod
->symtab
[best
].st_value
;
2097 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2100 /* For kallsyms to ask for address resolution. NULL means not found.
2101 We don't lock, as this is used for oops resolution and races are a
2103 const char *module_address_lookup(unsigned long addr
,
2104 unsigned long *size
,
2105 unsigned long *offset
,
2110 list_for_each_entry(mod
, &modules
, list
) {
2111 if (within(addr
, mod
->module_init
, mod
->init_size
)
2112 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2114 *modname
= mod
->name
;
2115 return get_ksymbol(mod
, addr
, size
, offset
);
2121 struct module
*module_get_kallsym(unsigned int symnum
, unsigned long *value
,
2122 char *type
, char *name
, size_t namelen
)
2126 mutex_lock(&module_mutex
);
2127 list_for_each_entry(mod
, &modules
, list
) {
2128 if (symnum
< mod
->num_symtab
) {
2129 *value
= mod
->symtab
[symnum
].st_value
;
2130 *type
= mod
->symtab
[symnum
].st_info
;
2131 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2133 mutex_unlock(&module_mutex
);
2136 symnum
-= mod
->num_symtab
;
2138 mutex_unlock(&module_mutex
);
2142 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2146 for (i
= 0; i
< mod
->num_symtab
; i
++)
2147 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2148 mod
->symtab
[i
].st_info
!= 'U')
2149 return mod
->symtab
[i
].st_value
;
2153 /* Look for this name: can be of form module:name. */
2154 unsigned long module_kallsyms_lookup_name(const char *name
)
2158 unsigned long ret
= 0;
2160 /* Don't lock: we're in enough trouble already. */
2161 if ((colon
= strchr(name
, ':')) != NULL
) {
2163 if ((mod
= find_module(name
)) != NULL
)
2164 ret
= mod_find_symname(mod
, colon
+1);
2167 list_for_each_entry(mod
, &modules
, list
)
2168 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2173 #endif /* CONFIG_KALLSYMS */
2175 /* Called by the /proc file system to return a list of modules. */
2176 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2178 struct list_head
*i
;
2181 mutex_lock(&module_mutex
);
2182 list_for_each(i
, &modules
) {
2191 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2193 struct list_head
*i
= p
;
2195 if (i
->next
== &modules
)
2200 static void m_stop(struct seq_file
*m
, void *p
)
2202 mutex_unlock(&module_mutex
);
2205 static char *taint_flags(unsigned int taints
, char *buf
)
2211 if (taints
& TAINT_PROPRIETARY_MODULE
)
2213 if (taints
& TAINT_FORCED_MODULE
)
2216 * TAINT_FORCED_RMMOD: could be added.
2217 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2227 static int m_show(struct seq_file
*m
, void *p
)
2229 struct module
*mod
= list_entry(p
, struct module
, list
);
2232 seq_printf(m
, "%s %lu",
2233 mod
->name
, mod
->init_size
+ mod
->core_size
);
2234 print_unload_info(m
, mod
);
2236 /* Informative for users. */
2237 seq_printf(m
, " %s",
2238 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2239 mod
->state
== MODULE_STATE_COMING
? "Loading":
2241 /* Used by oprofile and other similar tools. */
2242 seq_printf(m
, " 0x%p", mod
->module_core
);
2246 seq_printf(m
, " %s", taint_flags(mod
->taints
, buf
));
2248 seq_printf(m
, "\n");
2252 /* Format: modulename size refcount deps address
2254 Where refcount is a number or -, and deps is a comma-separated list
2257 const struct seq_operations modules_op
= {
2264 /* Given an address, look for it in the module exception tables. */
2265 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2267 unsigned long flags
;
2268 const struct exception_table_entry
*e
= NULL
;
2271 spin_lock_irqsave(&modlist_lock
, flags
);
2272 list_for_each_entry(mod
, &modules
, list
) {
2273 if (mod
->num_exentries
== 0)
2276 e
= search_extable(mod
->extable
,
2277 mod
->extable
+ mod
->num_exentries
- 1,
2282 spin_unlock_irqrestore(&modlist_lock
, flags
);
2284 /* Now, if we found one, we are running inside it now, hence
2285 we cannot unload the module, hence no refcnt needed. */
2290 * Is this a valid module address?
2292 int is_module_address(unsigned long addr
)
2294 unsigned long flags
;
2297 spin_lock_irqsave(&modlist_lock
, flags
);
2299 list_for_each_entry(mod
, &modules
, list
) {
2300 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2301 spin_unlock_irqrestore(&modlist_lock
, flags
);
2306 spin_unlock_irqrestore(&modlist_lock
, flags
);
2312 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2313 struct module
*__module_text_address(unsigned long addr
)
2317 list_for_each_entry(mod
, &modules
, list
)
2318 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2319 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2324 struct module
*module_text_address(unsigned long addr
)
2327 unsigned long flags
;
2329 spin_lock_irqsave(&modlist_lock
, flags
);
2330 mod
= __module_text_address(addr
);
2331 spin_unlock_irqrestore(&modlist_lock
, flags
);
2336 /* Don't grab lock, we're oopsing. */
2337 void print_modules(void)
2342 printk("Modules linked in:");
2343 list_for_each_entry(mod
, &modules
, list
)
2344 printk(" %s%s", mod
->name
, taint_flags(mod
->taints
, buf
));
2348 static char *make_driver_name(struct device_driver
*drv
)
2352 driver_name
= kmalloc(strlen(drv
->name
) + strlen(drv
->bus
->name
) + 2,
2357 sprintf(driver_name
, "%s:%s", drv
->bus
->name
, drv
->name
);
2361 static void module_create_drivers_dir(struct module_kobject
*mk
)
2363 if (!mk
|| mk
->drivers_dir
)
2366 mk
->drivers_dir
= kobject_add_dir(&mk
->kobj
, "drivers");
2369 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2373 struct module_kobject
*mk
= NULL
;
2380 else if (drv
->mod_name
) {
2381 struct kobject
*mkobj
;
2383 /* Lookup built-in module entry in /sys/modules */
2384 mkobj
= kset_find_obj(&module_subsys
.kset
, drv
->mod_name
);
2386 mk
= container_of(mkobj
, struct module_kobject
, kobj
);
2392 /* Don't check return codes; these calls are idempotent */
2393 no_warn
= sysfs_create_link(&drv
->kobj
, &mk
->kobj
, "module");
2394 driver_name
= make_driver_name(drv
);
2396 module_create_drivers_dir(mk
);
2397 no_warn
= sysfs_create_link(mk
->drivers_dir
, &drv
->kobj
,
2402 EXPORT_SYMBOL(module_add_driver
);
2404 void module_remove_driver(struct device_driver
*drv
)
2411 sysfs_remove_link(&drv
->kobj
, "module");
2412 if (drv
->owner
&& drv
->owner
->mkobj
.drivers_dir
) {
2413 driver_name
= make_driver_name(drv
);
2415 sysfs_remove_link(drv
->owner
->mkobj
.drivers_dir
,
2421 EXPORT_SYMBOL(module_remove_driver
);
2423 #ifdef CONFIG_MODVERSIONS
2424 /* Generate the signature for struct module here, too, for modversions. */
2425 void struct_module(struct module
*mod
) { return; }
2426 EXPORT_SYMBOL(struct_module
);