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
;
540 if (b
== NULL
|| already_uses(a
, b
)) return 1;
542 if (!strong_try_module_get(b
))
545 DEBUGP("Allocating new usage for %s.\n", a
->name
);
546 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
548 printk("%s: out of memory loading\n", a
->name
);
553 use
->module_which_uses
= a
;
554 list_add(&use
->list
, &b
->modules_which_use_me
);
558 /* Clear the unload stuff of the module. */
559 static void module_unload_free(struct module
*mod
)
563 list_for_each_entry(i
, &modules
, list
) {
564 struct module_use
*use
;
566 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
567 if (use
->module_which_uses
== mod
) {
568 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
570 list_del(&use
->list
);
572 /* There can be at most one match. */
579 #ifdef CONFIG_MODULE_FORCE_UNLOAD
580 static inline int try_force_unload(unsigned int flags
)
582 int ret
= (flags
& O_TRUNC
);
584 add_taint(TAINT_FORCED_RMMOD
);
588 static inline int try_force_unload(unsigned int flags
)
592 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
601 /* Whole machine is stopped with interrupts off when this runs. */
602 static int __try_stop_module(void *_sref
)
604 struct stopref
*sref
= _sref
;
606 /* If it's not unused, quit unless we are told to block. */
607 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
608 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
612 /* Mark it as dying. */
613 sref
->mod
->state
= MODULE_STATE_GOING
;
617 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
619 struct stopref sref
= { mod
, flags
, forced
};
621 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
624 unsigned int module_refcount(struct module
*mod
)
626 unsigned int i
, total
= 0;
628 for (i
= 0; i
< NR_CPUS
; i
++)
629 total
+= local_read(&mod
->ref
[i
].count
);
632 EXPORT_SYMBOL(module_refcount
);
634 /* This exists whether we can unload or not */
635 static void free_module(struct module
*mod
);
637 static void wait_for_zero_refcount(struct module
*mod
)
639 /* Since we might sleep for some time, drop the semaphore first */
640 mutex_unlock(&module_mutex
);
642 DEBUGP("Looking at refcount...\n");
643 set_current_state(TASK_UNINTERRUPTIBLE
);
644 if (module_refcount(mod
) == 0)
648 current
->state
= TASK_RUNNING
;
649 mutex_lock(&module_mutex
);
653 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
656 char name
[MODULE_NAME_LEN
];
659 if (!capable(CAP_SYS_MODULE
))
662 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
664 name
[MODULE_NAME_LEN
-1] = '\0';
666 if (mutex_lock_interruptible(&module_mutex
) != 0)
669 mod
= find_module(name
);
675 if (!list_empty(&mod
->modules_which_use_me
)) {
676 /* Other modules depend on us: get rid of them first. */
681 /* Doing init or already dying? */
682 if (mod
->state
!= MODULE_STATE_LIVE
) {
683 /* FIXME: if (force), slam module count and wake up
685 DEBUGP("%s already dying\n", mod
->name
);
690 /* If it has an init func, it must have an exit func to unload */
691 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
693 forced
= try_force_unload(flags
);
695 /* This module can't be removed */
701 /* Set this up before setting mod->state */
702 mod
->waiter
= current
;
704 /* Stop the machine so refcounts can't move and disable module. */
705 ret
= try_stop_module(mod
, flags
, &forced
);
709 /* Never wait if forced. */
710 if (!forced
&& module_refcount(mod
) != 0)
711 wait_for_zero_refcount(mod
);
713 /* Final destruction now noone is using it. */
714 if (mod
->exit
!= NULL
) {
715 mutex_unlock(&module_mutex
);
717 mutex_lock(&module_mutex
);
722 mutex_unlock(&module_mutex
);
726 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
728 struct module_use
*use
;
729 int printed_something
= 0;
731 seq_printf(m
, " %u ", module_refcount(mod
));
733 /* Always include a trailing , so userspace can differentiate
734 between this and the old multi-field proc format. */
735 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
736 printed_something
= 1;
737 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
741 printed_something
= 1;
742 seq_printf(m
, "[unsafe],");
745 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
746 printed_something
= 1;
747 seq_printf(m
, "[permanent],");
750 if (!printed_something
)
754 void __symbol_put(const char *symbol
)
756 struct module
*owner
;
758 const unsigned long *crc
;
760 spin_lock_irqsave(&modlist_lock
, flags
);
761 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
764 spin_unlock_irqrestore(&modlist_lock
, flags
);
766 EXPORT_SYMBOL(__symbol_put
);
768 void symbol_put_addr(void *addr
)
770 struct module
*modaddr
;
772 if (core_kernel_text((unsigned long)addr
))
775 if (!(modaddr
= module_text_address((unsigned long)addr
)))
779 EXPORT_SYMBOL_GPL(symbol_put_addr
);
781 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
782 struct module
*mod
, char *buffer
)
784 /* sysfs holds a reference */
785 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
788 static struct module_attribute refcnt
= {
789 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
793 void module_put(struct module
*module
)
796 unsigned int cpu
= get_cpu();
797 local_dec(&module
->ref
[cpu
].count
);
798 /* Maybe they're waiting for us to drop reference? */
799 if (unlikely(!module_is_live(module
)))
800 wake_up_process(module
->waiter
);
804 EXPORT_SYMBOL(module_put
);
806 #else /* !CONFIG_MODULE_UNLOAD */
807 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
809 /* We don't know the usage count, or what modules are using. */
810 seq_printf(m
, " - -");
813 static inline void module_unload_free(struct module
*mod
)
817 static inline int use_module(struct module
*a
, struct module
*b
)
819 return strong_try_module_get(b
);
822 static inline void module_unload_init(struct module
*mod
)
825 #endif /* CONFIG_MODULE_UNLOAD */
827 static ssize_t
show_initstate(struct module_attribute
*mattr
,
828 struct module
*mod
, char *buffer
)
830 const char *state
= "unknown";
832 switch (mod
->state
) {
833 case MODULE_STATE_LIVE
:
836 case MODULE_STATE_COMING
:
839 case MODULE_STATE_GOING
:
843 return sprintf(buffer
, "%s\n", state
);
846 static struct module_attribute initstate
= {
847 .attr
= { .name
= "initstate", .mode
= 0444, .owner
= THIS_MODULE
},
848 .show
= show_initstate
,
851 static struct module_attribute
*modinfo_attrs
[] = {
855 #ifdef CONFIG_MODULE_UNLOAD
861 static const char vermagic
[] = VERMAGIC_STRING
;
863 #ifdef CONFIG_MODVERSIONS
864 static int check_version(Elf_Shdr
*sechdrs
,
865 unsigned int versindex
,
868 const unsigned long *crc
)
870 unsigned int i
, num_versions
;
871 struct modversion_info
*versions
;
873 /* Exporting module didn't supply crcs? OK, we're already tainted. */
877 versions
= (void *) sechdrs
[versindex
].sh_addr
;
878 num_versions
= sechdrs
[versindex
].sh_size
879 / sizeof(struct modversion_info
);
881 for (i
= 0; i
< num_versions
; i
++) {
882 if (strcmp(versions
[i
].name
, symname
) != 0)
885 if (versions
[i
].crc
== *crc
)
887 printk("%s: disagrees about version of symbol %s\n",
889 DEBUGP("Found checksum %lX vs module %lX\n",
890 *crc
, versions
[i
].crc
);
893 /* Not in module's version table. OK, but that taints the kernel. */
894 if (!(tainted
& TAINT_FORCED_MODULE
))
895 printk("%s: no version for \"%s\" found: kernel tainted.\n",
897 add_taint_module(mod
, TAINT_FORCED_MODULE
);
901 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
902 unsigned int versindex
,
905 const unsigned long *crc
;
906 struct module
*owner
;
908 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
910 return check_version(sechdrs
, versindex
, "struct_module", mod
,
914 /* First part is kernel version, which we ignore. */
915 static inline int same_magic(const char *amagic
, const char *bmagic
)
917 amagic
+= strcspn(amagic
, " ");
918 bmagic
+= strcspn(bmagic
, " ");
919 return strcmp(amagic
, bmagic
) == 0;
922 static inline int check_version(Elf_Shdr
*sechdrs
,
923 unsigned int versindex
,
926 const unsigned long *crc
)
931 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
932 unsigned int versindex
,
938 static inline int same_magic(const char *amagic
, const char *bmagic
)
940 return strcmp(amagic
, bmagic
) == 0;
942 #endif /* CONFIG_MODVERSIONS */
944 /* Resolve a symbol for this module. I.e. if we find one, record usage.
945 Must be holding module_mutex. */
946 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
947 unsigned int versindex
,
951 struct module
*owner
;
953 const unsigned long *crc
;
955 ret
= __find_symbol(name
, &owner
, &crc
,
956 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
));
958 /* use_module can fail due to OOM, or module unloading */
959 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
960 !use_module(mod
, owner
))
968 * /sys/module/foo/sections stuff
969 * J. Corbet <corbet@lwn.net>
971 #ifdef CONFIG_KALLSYMS
972 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
973 struct module
*mod
, char *buf
)
975 struct module_sect_attr
*sattr
=
976 container_of(mattr
, struct module_sect_attr
, mattr
);
977 return sprintf(buf
, "0x%lx\n", sattr
->address
);
980 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
984 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
985 kfree(sect_attrs
->attrs
[section
].name
);
989 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
990 char *secstrings
, Elf_Shdr
*sechdrs
)
992 unsigned int nloaded
= 0, i
, size
[2];
993 struct module_sect_attrs
*sect_attrs
;
994 struct module_sect_attr
*sattr
;
995 struct attribute
**gattr
;
997 /* Count loaded sections and allocate structures */
998 for (i
= 0; i
< nsect
; i
++)
999 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1001 size
[0] = ALIGN(sizeof(*sect_attrs
)
1002 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1003 sizeof(sect_attrs
->grp
.attrs
[0]));
1004 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1005 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1006 if (sect_attrs
== NULL
)
1009 /* Setup section attributes. */
1010 sect_attrs
->grp
.name
= "sections";
1011 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1013 sect_attrs
->nsections
= 0;
1014 sattr
= §_attrs
->attrs
[0];
1015 gattr
= §_attrs
->grp
.attrs
[0];
1016 for (i
= 0; i
< nsect
; i
++) {
1017 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1019 sattr
->address
= sechdrs
[i
].sh_addr
;
1020 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1022 if (sattr
->name
== NULL
)
1024 sect_attrs
->nsections
++;
1025 sattr
->mattr
.show
= module_sect_show
;
1026 sattr
->mattr
.store
= NULL
;
1027 sattr
->mattr
.attr
.name
= sattr
->name
;
1028 sattr
->mattr
.attr
.owner
= mod
;
1029 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1030 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1034 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1037 mod
->sect_attrs
= sect_attrs
;
1040 free_sect_attrs(sect_attrs
);
1043 static void remove_sect_attrs(struct module
*mod
)
1045 if (mod
->sect_attrs
) {
1046 sysfs_remove_group(&mod
->mkobj
.kobj
,
1047 &mod
->sect_attrs
->grp
);
1048 /* We are positive that no one is using any sect attrs
1049 * at this point. Deallocate immediately. */
1050 free_sect_attrs(mod
->sect_attrs
);
1051 mod
->sect_attrs
= NULL
;
1057 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1058 char *sectstrings
, Elf_Shdr
*sechdrs
)
1062 static inline void remove_sect_attrs(struct module
*mod
)
1065 #endif /* CONFIG_KALLSYMS */
1067 static int module_add_modinfo_attrs(struct module
*mod
)
1069 struct module_attribute
*attr
;
1070 struct module_attribute
*temp_attr
;
1074 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1075 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1077 if (!mod
->modinfo_attrs
)
1080 temp_attr
= mod
->modinfo_attrs
;
1081 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1083 (attr
->test
&& attr
->test(mod
))) {
1084 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1085 temp_attr
->attr
.owner
= mod
;
1086 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1093 static void module_remove_modinfo_attrs(struct module
*mod
)
1095 struct module_attribute
*attr
;
1098 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1099 /* pick a field to test for end of list */
1100 if (!attr
->attr
.name
)
1102 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1106 kfree(mod
->modinfo_attrs
);
1109 static int mod_sysfs_setup(struct module
*mod
,
1110 struct kernel_param
*kparam
,
1111 unsigned int num_params
)
1115 if (!module_subsys
.kset
.subsys
) {
1116 printk(KERN_ERR
"%s: module_subsys not initialized\n",
1121 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1122 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1125 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1126 mod
->mkobj
.mod
= mod
;
1128 /* delay uevent until full sysfs population */
1129 kobject_init(&mod
->mkobj
.kobj
);
1130 err
= kobject_add(&mod
->mkobj
.kobj
);
1134 mod
->drivers_dir
= kobject_add_dir(&mod
->mkobj
.kobj
, "drivers");
1135 if (!mod
->drivers_dir
)
1138 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1140 goto out_unreg_drivers
;
1142 err
= module_add_modinfo_attrs(mod
);
1144 goto out_unreg_param
;
1146 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1150 kobject_unregister(mod
->drivers_dir
);
1152 module_param_sysfs_remove(mod
);
1154 kobject_del(&mod
->mkobj
.kobj
);
1155 kobject_put(&mod
->mkobj
.kobj
);
1160 static void mod_kobject_remove(struct module
*mod
)
1162 module_remove_modinfo_attrs(mod
);
1163 module_param_sysfs_remove(mod
);
1164 kobject_unregister(mod
->drivers_dir
);
1166 kobject_unregister(&mod
->mkobj
.kobj
);
1170 * unlink the module with the whole machine is stopped with interrupts off
1171 * - this defends against kallsyms not taking locks
1173 static int __unlink_module(void *_mod
)
1175 struct module
*mod
= _mod
;
1176 list_del(&mod
->list
);
1180 /* Free a module, remove from lists, etc (must hold module mutex). */
1181 static void free_module(struct module
*mod
)
1183 /* Delete from various lists */
1184 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1185 remove_sect_attrs(mod
);
1186 mod_kobject_remove(mod
);
1188 unwind_remove_table(mod
->unwind_info
, 0);
1190 /* Arch-specific cleanup. */
1191 module_arch_cleanup(mod
);
1193 /* Module unload stuff */
1194 module_unload_free(mod
);
1196 /* This may be NULL, but that's OK */
1197 module_free(mod
, mod
->module_init
);
1200 percpu_modfree(mod
->percpu
);
1202 /* Free lock-classes: */
1203 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1205 /* Finally, free the core (containing the module structure) */
1206 module_free(mod
, mod
->module_core
);
1209 void *__symbol_get(const char *symbol
)
1211 struct module
*owner
;
1212 unsigned long value
, flags
;
1213 const unsigned long *crc
;
1215 spin_lock_irqsave(&modlist_lock
, flags
);
1216 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1217 if (value
&& !strong_try_module_get(owner
))
1219 spin_unlock_irqrestore(&modlist_lock
, flags
);
1221 return (void *)value
;
1223 EXPORT_SYMBOL_GPL(__symbol_get
);
1226 * Ensure that an exported symbol [global namespace] does not already exist
1227 * in the Kernel or in some other modules exported symbol table.
1229 static int verify_export_symbols(struct module
*mod
)
1231 const char *name
= NULL
;
1232 unsigned long i
, ret
= 0;
1233 struct module
*owner
;
1234 const unsigned long *crc
;
1236 for (i
= 0; i
< mod
->num_syms
; i
++)
1237 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1238 name
= mod
->syms
[i
].name
;
1243 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1244 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1245 name
= mod
->gpl_syms
[i
].name
;
1252 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1253 mod
->name
, name
, module_name(owner
));
1258 /* Change all symbols so that sh_value encodes the pointer directly. */
1259 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1260 unsigned int symindex
,
1262 unsigned int versindex
,
1263 unsigned int pcpuindex
,
1266 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1267 unsigned long secbase
;
1268 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1271 for (i
= 1; i
< n
; i
++) {
1272 switch (sym
[i
].st_shndx
) {
1274 /* We compiled with -fno-common. These are not
1275 supposed to happen. */
1276 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1277 printk("%s: please compile with -fno-common\n",
1283 /* Don't need to do anything */
1284 DEBUGP("Absolute symbol: 0x%08lx\n",
1285 (long)sym
[i
].st_value
);
1290 = resolve_symbol(sechdrs
, versindex
,
1291 strtab
+ sym
[i
].st_name
, mod
);
1293 /* Ok if resolved. */
1294 if (sym
[i
].st_value
!= 0)
1297 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1300 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1301 mod
->name
, strtab
+ sym
[i
].st_name
);
1306 /* Divert to percpu allocation if a percpu var. */
1307 if (sym
[i
].st_shndx
== pcpuindex
)
1308 secbase
= (unsigned long)mod
->percpu
;
1310 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1311 sym
[i
].st_value
+= secbase
;
1319 /* Update size with this section: return offset. */
1320 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1324 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1325 *size
= ret
+ sechdr
->sh_size
;
1329 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1330 might -- code, read-only data, read-write data, small data. Tally
1331 sizes, and place the offsets into sh_entsize fields: high bit means it
1333 static void layout_sections(struct module
*mod
,
1334 const Elf_Ehdr
*hdr
,
1336 const char *secstrings
)
1338 static unsigned long const masks
[][2] = {
1339 /* NOTE: all executable code must be the first section
1340 * in this array; otherwise modify the text_size
1341 * finder in the two loops below */
1342 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1343 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1344 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1345 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1349 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1350 sechdrs
[i
].sh_entsize
= ~0UL;
1352 DEBUGP("Core section allocation order:\n");
1353 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1354 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1355 Elf_Shdr
*s
= &sechdrs
[i
];
1357 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1358 || (s
->sh_flags
& masks
[m
][1])
1359 || s
->sh_entsize
!= ~0UL
1360 || strncmp(secstrings
+ s
->sh_name
,
1363 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1364 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1367 mod
->core_text_size
= mod
->core_size
;
1370 DEBUGP("Init section allocation order:\n");
1371 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1372 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1373 Elf_Shdr
*s
= &sechdrs
[i
];
1375 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1376 || (s
->sh_flags
& masks
[m
][1])
1377 || s
->sh_entsize
!= ~0UL
1378 || strncmp(secstrings
+ s
->sh_name
,
1381 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1382 | INIT_OFFSET_MASK
);
1383 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1386 mod
->init_text_size
= mod
->init_size
;
1390 static void set_license(struct module
*mod
, const char *license
)
1393 license
= "unspecified";
1395 if (!license_is_gpl_compatible(license
)) {
1396 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1397 printk(KERN_WARNING
"%s: module license '%s' taints "
1398 "kernel.\n", mod
->name
, license
);
1399 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1403 /* Parse tag=value strings from .modinfo section */
1404 static char *next_string(char *string
, unsigned long *secsize
)
1406 /* Skip non-zero chars */
1409 if ((*secsize
)-- <= 1)
1413 /* Skip any zero padding. */
1414 while (!string
[0]) {
1416 if ((*secsize
)-- <= 1)
1422 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1427 unsigned int taglen
= strlen(tag
);
1428 unsigned long size
= sechdrs
[info
].sh_size
;
1430 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1431 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1432 return p
+ taglen
+ 1;
1437 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1438 unsigned int infoindex
)
1440 struct module_attribute
*attr
;
1443 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1446 get_modinfo(sechdrs
,
1452 #ifdef CONFIG_KALLSYMS
1453 int is_exported(const char *name
, const struct module
*mod
)
1455 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1458 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1465 static char elf_type(const Elf_Sym
*sym
,
1467 const char *secstrings
,
1470 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1471 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1476 if (sym
->st_shndx
== SHN_UNDEF
)
1478 if (sym
->st_shndx
== SHN_ABS
)
1480 if (sym
->st_shndx
>= SHN_LORESERVE
)
1482 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1484 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1485 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1486 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1488 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1493 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1494 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1499 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1500 ".debug", strlen(".debug")) == 0)
1505 static void add_kallsyms(struct module
*mod
,
1507 unsigned int symindex
,
1508 unsigned int strindex
,
1509 const char *secstrings
)
1513 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1514 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1515 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1517 /* Set types up while we still have access to sections. */
1518 for (i
= 0; i
< mod
->num_symtab
; i
++)
1519 mod
->symtab
[i
].st_info
1520 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1523 static inline void add_kallsyms(struct module
*mod
,
1525 unsigned int symindex
,
1526 unsigned int strindex
,
1527 const char *secstrings
)
1530 #endif /* CONFIG_KALLSYMS */
1532 /* Allocate and load the module: note that size of section 0 is always
1533 zero, and we rely on this for optional sections. */
1534 static struct module
*load_module(void __user
*umod
,
1536 const char __user
*uargs
)
1540 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1542 unsigned int symindex
= 0;
1543 unsigned int strindex
= 0;
1544 unsigned int setupindex
;
1545 unsigned int exindex
;
1546 unsigned int exportindex
;
1547 unsigned int modindex
;
1548 unsigned int obsparmindex
;
1549 unsigned int infoindex
;
1550 unsigned int gplindex
;
1551 unsigned int crcindex
;
1552 unsigned int gplcrcindex
;
1553 unsigned int versindex
;
1554 unsigned int pcpuindex
;
1555 unsigned int gplfutureindex
;
1556 unsigned int gplfuturecrcindex
;
1557 unsigned int unwindex
= 0;
1558 unsigned int unusedindex
;
1559 unsigned int unusedcrcindex
;
1560 unsigned int unusedgplindex
;
1561 unsigned int unusedgplcrcindex
;
1564 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1565 struct exception_table_entry
*extable
;
1566 mm_segment_t old_fs
;
1568 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1570 if (len
< sizeof(*hdr
))
1571 return ERR_PTR(-ENOEXEC
);
1573 /* Suck in entire file: we'll want most of it. */
1574 /* vmalloc barfs on "unusual" numbers. Check here */
1575 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1576 return ERR_PTR(-ENOMEM
);
1577 if (copy_from_user(hdr
, umod
, len
) != 0) {
1582 /* Sanity checks against insmoding binaries or wrong arch,
1583 weird elf version */
1584 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1585 || hdr
->e_type
!= ET_REL
1586 || !elf_check_arch(hdr
)
1587 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1592 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1595 /* Convenience variables */
1596 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1597 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1598 sechdrs
[0].sh_addr
= 0;
1600 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1601 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1602 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1605 /* Mark all sections sh_addr with their address in the
1607 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1609 /* Internal symbols and strings. */
1610 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1612 strindex
= sechdrs
[i
].sh_link
;
1613 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1615 #ifndef CONFIG_MODULE_UNLOAD
1616 /* Don't load .exit sections */
1617 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1618 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1622 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1623 ".gnu.linkonce.this_module");
1625 printk(KERN_WARNING
"No module found in object\n");
1629 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1631 if (symindex
== 0) {
1632 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1638 /* Optional sections */
1639 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1640 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1641 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1642 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1643 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1644 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1645 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1646 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1647 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1648 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1649 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1650 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1651 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1652 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1653 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1654 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1655 #ifdef ARCH_UNWIND_SECTION_NAME
1656 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1659 /* Don't keep modinfo section */
1660 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1661 #ifdef CONFIG_KALLSYMS
1662 /* Keep symbol and string tables for decoding later. */
1663 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1664 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1667 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1669 /* Check module struct version now, before we try to use module. */
1670 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1675 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1676 /* This is allowed: modprobe --force will invalidate it. */
1678 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1679 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1681 } else if (!same_magic(modmagic
, vermagic
)) {
1682 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1683 mod
->name
, modmagic
, vermagic
);
1688 /* Now copy in args */
1689 args
= strndup_user(uargs
, ~0UL >> 1);
1691 err
= PTR_ERR(args
);
1695 if (find_module(mod
->name
)) {
1700 mod
->state
= MODULE_STATE_COMING
;
1702 /* Allow arches to frob section contents and sizes. */
1703 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1708 /* We have a special allocation for this section. */
1709 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1710 sechdrs
[pcpuindex
].sh_addralign
,
1716 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1717 mod
->percpu
= percpu
;
1720 /* Determine total sizes, and put offsets in sh_entsize. For now
1721 this is done generically; there doesn't appear to be any
1722 special cases for the architectures. */
1723 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1725 /* Do the allocs. */
1726 ptr
= module_alloc(mod
->core_size
);
1731 memset(ptr
, 0, mod
->core_size
);
1732 mod
->module_core
= ptr
;
1734 ptr
= module_alloc(mod
->init_size
);
1735 if (!ptr
&& mod
->init_size
) {
1739 memset(ptr
, 0, mod
->init_size
);
1740 mod
->module_init
= ptr
;
1742 /* Transfer each section which specifies SHF_ALLOC */
1743 DEBUGP("final section addresses:\n");
1744 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1747 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1750 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1751 dest
= mod
->module_init
1752 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1754 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1756 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1757 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1758 sechdrs
[i
].sh_size
);
1759 /* Update sh_addr to point to copy in image. */
1760 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1761 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1763 /* Module has been moved. */
1764 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1766 /* Now we've moved module, initialize linked lists, etc. */
1767 module_unload_init(mod
);
1769 /* Set up license info based on the info section */
1770 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1772 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1773 add_taint(TAINT_PROPRIETARY_MODULE
);
1774 if (strcmp(mod
->name
, "driverloader") == 0)
1775 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1777 /* Set up MODINFO_ATTR fields */
1778 setup_modinfo(mod
, sechdrs
, infoindex
);
1780 /* Fix up syms, so that st_value is a pointer to location. */
1781 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1786 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1787 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1788 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1790 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1791 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1792 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1794 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1795 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1796 sizeof(*mod
->gpl_future_syms
);
1797 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1798 sizeof(*mod
->unused_syms
);
1799 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1800 sizeof(*mod
->unused_gpl_syms
);
1801 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1802 if (gplfuturecrcindex
)
1803 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1805 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1807 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1808 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1809 if (unusedgplcrcindex
)
1810 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1812 #ifdef CONFIG_MODVERSIONS
1813 if ((mod
->num_syms
&& !crcindex
) ||
1814 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1815 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1816 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1817 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1818 printk(KERN_WARNING
"%s: No versions for exported symbols."
1819 " Tainting kernel.\n", mod
->name
);
1820 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1824 /* Now do relocations. */
1825 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1826 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1827 unsigned int info
= sechdrs
[i
].sh_info
;
1829 /* Not a valid relocation section? */
1830 if (info
>= hdr
->e_shnum
)
1833 /* Don't bother with non-allocated sections */
1834 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1837 if (sechdrs
[i
].sh_type
== SHT_REL
)
1838 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1839 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1840 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1846 /* Find duplicate symbols */
1847 err
= verify_export_symbols(mod
);
1852 /* Set up and sort exception table */
1853 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1854 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1855 sort_extable(extable
, extable
+ mod
->num_exentries
);
1857 /* Finally, copy percpu area over. */
1858 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1859 sechdrs
[pcpuindex
].sh_size
);
1861 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1863 err
= module_finalize(hdr
, sechdrs
, mod
);
1867 /* flush the icache in correct context */
1872 * Flush the instruction cache, since we've played with text.
1873 * Do it before processing of module parameters, so the module
1874 * can provide parameter accessor functions of its own.
1876 if (mod
->module_init
)
1877 flush_icache_range((unsigned long)mod
->module_init
,
1878 (unsigned long)mod
->module_init
1880 flush_icache_range((unsigned long)mod
->module_core
,
1881 (unsigned long)mod
->module_core
+ mod
->core_size
);
1887 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
1890 /* Size of section 0 is 0, so this works well if no params */
1891 err
= parse_args(mod
->name
, mod
->args
,
1892 (struct kernel_param
*)
1893 sechdrs
[setupindex
].sh_addr
,
1894 sechdrs
[setupindex
].sh_size
1895 / sizeof(struct kernel_param
),
1900 err
= mod_sysfs_setup(mod
,
1901 (struct kernel_param
*)
1902 sechdrs
[setupindex
].sh_addr
,
1903 sechdrs
[setupindex
].sh_size
1904 / sizeof(struct kernel_param
));
1907 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1909 /* Size of section 0 is 0, so this works well if no unwind info. */
1910 mod
->unwind_info
= unwind_add_table(mod
,
1911 (void *)sechdrs
[unwindex
].sh_addr
,
1912 sechdrs
[unwindex
].sh_size
);
1914 /* Get rid of temporary copy */
1921 module_arch_cleanup(mod
);
1923 module_unload_free(mod
);
1924 module_free(mod
, mod
->module_init
);
1926 module_free(mod
, mod
->module_core
);
1929 percpu_modfree(percpu
);
1934 return ERR_PTR(err
);
1937 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1943 * link the module with the whole machine is stopped with interrupts off
1944 * - this defends against kallsyms not taking locks
1946 static int __link_module(void *_mod
)
1948 struct module
*mod
= _mod
;
1949 list_add(&mod
->list
, &modules
);
1953 /* This is where the real work happens */
1955 sys_init_module(void __user
*umod
,
1957 const char __user
*uargs
)
1962 /* Must have permission */
1963 if (!capable(CAP_SYS_MODULE
))
1966 /* Only one module load at a time, please */
1967 if (mutex_lock_interruptible(&module_mutex
) != 0)
1970 /* Do all the hard work */
1971 mod
= load_module(umod
, len
, uargs
);
1973 mutex_unlock(&module_mutex
);
1974 return PTR_ERR(mod
);
1977 /* Now sew it into the lists. They won't access us, since
1978 strong_try_module_get() will fail. */
1979 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1981 /* Drop lock so they can recurse */
1982 mutex_unlock(&module_mutex
);
1984 blocking_notifier_call_chain(&module_notify_list
,
1985 MODULE_STATE_COMING
, mod
);
1987 /* Start the module */
1988 if (mod
->init
!= NULL
)
1991 /* Init routine failed: abort. Try to protect us from
1992 buggy refcounters. */
1993 mod
->state
= MODULE_STATE_GOING
;
1994 synchronize_sched();
1996 printk(KERN_ERR
"%s: module is now stuck!\n",
2000 mutex_lock(&module_mutex
);
2002 mutex_unlock(&module_mutex
);
2007 /* Now it's a first class citizen! */
2008 mutex_lock(&module_mutex
);
2009 mod
->state
= MODULE_STATE_LIVE
;
2010 /* Drop initial reference. */
2012 unwind_remove_table(mod
->unwind_info
, 1);
2013 module_free(mod
, mod
->module_init
);
2014 mod
->module_init
= NULL
;
2016 mod
->init_text_size
= 0;
2017 mutex_unlock(&module_mutex
);
2022 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2024 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2027 #ifdef CONFIG_KALLSYMS
2029 * This ignores the intensely annoying "mapping symbols" found
2030 * in ARM ELF files: $a, $t and $d.
2032 static inline int is_arm_mapping_symbol(const char *str
)
2034 return str
[0] == '$' && strchr("atd", str
[1])
2035 && (str
[2] == '\0' || str
[2] == '.');
2038 static const char *get_ksymbol(struct module
*mod
,
2040 unsigned long *size
,
2041 unsigned long *offset
)
2043 unsigned int i
, best
= 0;
2044 unsigned long nextval
;
2046 /* At worse, next value is at end of module */
2047 if (within(addr
, mod
->module_init
, mod
->init_size
))
2048 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2050 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2052 /* Scan for closest preceeding symbol, and next symbol. (ELF
2053 starts real symbols at 1). */
2054 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2055 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2058 /* We ignore unnamed symbols: they're uninformative
2059 * and inserted at a whim. */
2060 if (mod
->symtab
[i
].st_value
<= addr
2061 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2062 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2063 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2065 if (mod
->symtab
[i
].st_value
> addr
2066 && mod
->symtab
[i
].st_value
< nextval
2067 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2068 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2069 nextval
= mod
->symtab
[i
].st_value
;
2075 *size
= nextval
- mod
->symtab
[best
].st_value
;
2076 *offset
= addr
- mod
->symtab
[best
].st_value
;
2077 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2080 /* For kallsyms to ask for address resolution. NULL means not found.
2081 We don't lock, as this is used for oops resolution and races are a
2083 const char *module_address_lookup(unsigned long addr
,
2084 unsigned long *size
,
2085 unsigned long *offset
,
2090 list_for_each_entry(mod
, &modules
, list
) {
2091 if (within(addr
, mod
->module_init
, mod
->init_size
)
2092 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2094 *modname
= mod
->name
;
2095 return get_ksymbol(mod
, addr
, size
, offset
);
2101 struct module
*module_get_kallsym(unsigned int symnum
, unsigned long *value
,
2102 char *type
, char *name
, size_t namelen
)
2106 mutex_lock(&module_mutex
);
2107 list_for_each_entry(mod
, &modules
, list
) {
2108 if (symnum
< mod
->num_symtab
) {
2109 *value
= mod
->symtab
[symnum
].st_value
;
2110 *type
= mod
->symtab
[symnum
].st_info
;
2111 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2113 mutex_unlock(&module_mutex
);
2116 symnum
-= mod
->num_symtab
;
2118 mutex_unlock(&module_mutex
);
2122 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2126 for (i
= 0; i
< mod
->num_symtab
; i
++)
2127 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2128 mod
->symtab
[i
].st_info
!= 'U')
2129 return mod
->symtab
[i
].st_value
;
2133 /* Look for this name: can be of form module:name. */
2134 unsigned long module_kallsyms_lookup_name(const char *name
)
2138 unsigned long ret
= 0;
2140 /* Don't lock: we're in enough trouble already. */
2141 if ((colon
= strchr(name
, ':')) != NULL
) {
2143 if ((mod
= find_module(name
)) != NULL
)
2144 ret
= mod_find_symname(mod
, colon
+1);
2147 list_for_each_entry(mod
, &modules
, list
)
2148 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2153 #endif /* CONFIG_KALLSYMS */
2155 /* Called by the /proc file system to return a list of modules. */
2156 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2158 struct list_head
*i
;
2161 mutex_lock(&module_mutex
);
2162 list_for_each(i
, &modules
) {
2171 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2173 struct list_head
*i
= p
;
2175 if (i
->next
== &modules
)
2180 static void m_stop(struct seq_file
*m
, void *p
)
2182 mutex_unlock(&module_mutex
);
2185 static char *taint_flags(unsigned int taints
, char *buf
)
2191 if (taints
& TAINT_PROPRIETARY_MODULE
)
2193 if (taints
& TAINT_FORCED_MODULE
)
2196 * TAINT_FORCED_RMMOD: could be added.
2197 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2207 static int m_show(struct seq_file
*m
, void *p
)
2209 struct module
*mod
= list_entry(p
, struct module
, list
);
2212 seq_printf(m
, "%s %lu",
2213 mod
->name
, mod
->init_size
+ mod
->core_size
);
2214 print_unload_info(m
, mod
);
2216 /* Informative for users. */
2217 seq_printf(m
, " %s",
2218 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2219 mod
->state
== MODULE_STATE_COMING
? "Loading":
2221 /* Used by oprofile and other similar tools. */
2222 seq_printf(m
, " 0x%p", mod
->module_core
);
2226 seq_printf(m
, " %s", taint_flags(mod
->taints
, buf
));
2228 seq_printf(m
, "\n");
2232 /* Format: modulename size refcount deps address
2234 Where refcount is a number or -, and deps is a comma-separated list
2237 const struct seq_operations modules_op
= {
2244 /* Given an address, look for it in the module exception tables. */
2245 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2247 unsigned long flags
;
2248 const struct exception_table_entry
*e
= NULL
;
2251 spin_lock_irqsave(&modlist_lock
, flags
);
2252 list_for_each_entry(mod
, &modules
, list
) {
2253 if (mod
->num_exentries
== 0)
2256 e
= search_extable(mod
->extable
,
2257 mod
->extable
+ mod
->num_exentries
- 1,
2262 spin_unlock_irqrestore(&modlist_lock
, flags
);
2264 /* Now, if we found one, we are running inside it now, hence
2265 we cannot unload the module, hence no refcnt needed. */
2270 * Is this a valid module address?
2272 int is_module_address(unsigned long addr
)
2274 unsigned long flags
;
2277 spin_lock_irqsave(&modlist_lock
, flags
);
2279 list_for_each_entry(mod
, &modules
, list
) {
2280 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2281 spin_unlock_irqrestore(&modlist_lock
, flags
);
2286 spin_unlock_irqrestore(&modlist_lock
, flags
);
2292 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2293 struct module
*__module_text_address(unsigned long addr
)
2297 list_for_each_entry(mod
, &modules
, list
)
2298 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2299 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2304 struct module
*module_text_address(unsigned long addr
)
2307 unsigned long flags
;
2309 spin_lock_irqsave(&modlist_lock
, flags
);
2310 mod
= __module_text_address(addr
);
2311 spin_unlock_irqrestore(&modlist_lock
, flags
);
2316 /* Don't grab lock, we're oopsing. */
2317 void print_modules(void)
2322 printk("Modules linked in:");
2323 list_for_each_entry(mod
, &modules
, list
)
2324 printk(" %s%s", mod
->name
, taint_flags(mod
->taints
, buf
));
2328 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2335 /* Don't check return codes; these calls are idempotent */
2336 no_warn
= sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2337 no_warn
= sysfs_create_link(mod
->drivers_dir
, &drv
->kobj
, drv
->name
);
2339 EXPORT_SYMBOL(module_add_driver
);
2341 void module_remove_driver(struct device_driver
*drv
)
2345 sysfs_remove_link(&drv
->kobj
, "module");
2346 if (drv
->owner
&& drv
->owner
->drivers_dir
)
2347 sysfs_remove_link(drv
->owner
->drivers_dir
, drv
->name
);
2349 EXPORT_SYMBOL(module_remove_driver
);
2351 #ifdef CONFIG_MODVERSIONS
2352 /* Generate the signature for struct module here, too, for modversions. */
2353 void struct_module(struct module
*mod
) { return; }
2354 EXPORT_SYMBOL(struct_module
);