1 /* Rewritten by Rusty Russell, on the backs of many others...
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/config.h>
20 #include <linux/module.h>
21 #include <linux/moduleloader.h>
22 #include <linux/init.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/cpu.h>
31 #include <linux/moduleparam.h>
32 #include <linux/errno.h>
33 #include <linux/err.h>
34 #include <linux/vermagic.h>
35 #include <linux/notifier.h>
36 #include <linux/stop_machine.h>
37 #include <linux/device.h>
38 #include <asm/uaccess.h>
39 #include <asm/semaphore.h>
40 #include <asm/cacheflush.h>
45 #define DEBUGP(fmt , a...)
48 #ifndef ARCH_SHF_SMALL
49 #define ARCH_SHF_SMALL 0
52 /* If this is set, the section belongs in the init part of the module */
53 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
55 /* Protects module list */
56 static DEFINE_SPINLOCK(modlist_lock
);
58 /* List of modules, protected by module_mutex AND modlist_lock */
59 static DECLARE_MUTEX(module_mutex
);
60 static LIST_HEAD(modules
);
62 static DECLARE_MUTEX(notify_mutex
);
63 static struct notifier_block
* module_notify_list
;
65 int register_module_notifier(struct notifier_block
* nb
)
69 err
= notifier_chain_register(&module_notify_list
, nb
);
73 EXPORT_SYMBOL(register_module_notifier
);
75 int unregister_module_notifier(struct notifier_block
* nb
)
79 err
= notifier_chain_unregister(&module_notify_list
, nb
);
83 EXPORT_SYMBOL(unregister_module_notifier
);
85 /* We require a truly strong try_module_get() */
86 static inline int strong_try_module_get(struct module
*mod
)
88 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
90 return try_module_get(mod
);
93 /* A thread that wants to hold a reference to a module only while it
94 * is running can call ths to safely exit.
95 * nfsd and lockd use this.
97 void __module_put_and_exit(struct module
*mod
, long code
)
102 EXPORT_SYMBOL(__module_put_and_exit
);
104 /* Find a module section: 0 means not found. */
105 static unsigned int find_sec(Elf_Ehdr
*hdr
,
107 const char *secstrings
,
112 for (i
= 1; i
< hdr
->e_shnum
; i
++)
113 /* Alloc bit cleared means "ignore it." */
114 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
115 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
120 /* Provided by the linker */
121 extern const struct kernel_symbol __start___ksymtab
[];
122 extern const struct kernel_symbol __stop___ksymtab
[];
123 extern const struct kernel_symbol __start___ksymtab_gpl
[];
124 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
125 extern const unsigned long __start___kcrctab
[];
126 extern const unsigned long __start___kcrctab_gpl
[];
128 #ifndef CONFIG_MODVERSIONS
129 #define symversion(base, idx) NULL
131 #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL)
134 /* Find a symbol, return value, crc and module which owns it */
135 static unsigned long __find_symbol(const char *name
,
136 struct module
**owner
,
137 const unsigned long **crc
,
143 /* Core kernel first. */
145 for (i
= 0; __start___ksymtab
+i
< __stop___ksymtab
; i
++) {
146 if (strcmp(__start___ksymtab
[i
].name
, name
) == 0) {
147 *crc
= symversion(__start___kcrctab
, i
);
148 return __start___ksymtab
[i
].value
;
152 for (i
= 0; __start___ksymtab_gpl
+i
<__stop___ksymtab_gpl
; i
++)
153 if (strcmp(__start___ksymtab_gpl
[i
].name
, name
) == 0) {
154 *crc
= symversion(__start___kcrctab_gpl
, i
);
155 return __start___ksymtab_gpl
[i
].value
;
159 /* Now try modules. */
160 list_for_each_entry(mod
, &modules
, list
) {
162 for (i
= 0; i
< mod
->num_syms
; i
++)
163 if (strcmp(mod
->syms
[i
].name
, name
) == 0) {
164 *crc
= symversion(mod
->crcs
, i
);
165 return mod
->syms
[i
].value
;
169 for (i
= 0; i
< mod
->num_gpl_syms
; i
++) {
170 if (strcmp(mod
->gpl_syms
[i
].name
, name
) == 0) {
171 *crc
= symversion(mod
->gpl_crcs
, i
);
172 return mod
->gpl_syms
[i
].value
;
177 DEBUGP("Failed to find symbol %s\n", name
);
181 /* Find a symbol in this elf symbol table */
182 static unsigned long find_local_symbol(Elf_Shdr
*sechdrs
,
183 unsigned int symindex
,
188 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
190 /* Search (defined) internal symbols first. */
191 for (i
= 1; i
< sechdrs
[symindex
].sh_size
/sizeof(*sym
); i
++) {
192 if (sym
[i
].st_shndx
!= SHN_UNDEF
193 && strcmp(name
, strtab
+ sym
[i
].st_name
) == 0)
194 return sym
[i
].st_value
;
199 /* Search for module by name: must hold module_mutex. */
200 static struct module
*find_module(const char *name
)
204 list_for_each_entry(mod
, &modules
, list
) {
205 if (strcmp(mod
->name
, name
) == 0)
212 /* Number of blocks used and allocated. */
213 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
214 /* Size of each block. -ve means used. */
215 static int *pcpu_size
;
217 static int split_block(unsigned int i
, unsigned short size
)
219 /* Reallocation required? */
220 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
221 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
226 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
227 pcpu_num_allocated
*= 2;
232 /* Insert a new subblock */
233 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
234 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
237 pcpu_size
[i
+1] -= size
;
242 static inline unsigned int block_size(int val
)
249 /* Created by linker magic */
250 extern char __per_cpu_start
[], __per_cpu_end
[];
252 static void *percpu_modalloc(unsigned long size
, unsigned long align
)
258 BUG_ON(align
> SMP_CACHE_BYTES
);
260 ptr
= __per_cpu_start
;
261 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
262 /* Extra for alignment requirement. */
263 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
264 BUG_ON(i
== 0 && extra
!= 0);
266 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
269 /* Transfer extra to previous block. */
270 if (pcpu_size
[i
-1] < 0)
271 pcpu_size
[i
-1] -= extra
;
273 pcpu_size
[i
-1] += extra
;
274 pcpu_size
[i
] -= extra
;
277 /* Split block if warranted */
278 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
279 if (!split_block(i
, size
))
283 pcpu_size
[i
] = -pcpu_size
[i
];
287 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
292 static void percpu_modfree(void *freeme
)
295 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
297 /* First entry is core kernel percpu data. */
298 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
300 pcpu_size
[i
] = -pcpu_size
[i
];
307 /* Merge with previous? */
308 if (pcpu_size
[i
-1] >= 0) {
309 pcpu_size
[i
-1] += pcpu_size
[i
];
311 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
312 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
315 /* Merge with next? */
316 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
317 pcpu_size
[i
] += pcpu_size
[i
+1];
319 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
320 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
324 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
326 const char *secstrings
)
328 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
331 static int percpu_modinit(void)
334 pcpu_num_allocated
= 2;
335 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
337 /* Static in-kernel percpu data (used). */
338 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
340 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
341 if (pcpu_size
[1] < 0) {
342 printk(KERN_ERR
"No per-cpu room for modules.\n");
348 __initcall(percpu_modinit
);
349 #else /* ... !CONFIG_SMP */
350 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
)
354 static inline void percpu_modfree(void *pcpuptr
)
358 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
360 const char *secstrings
)
364 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
367 /* pcpusec should be 0, and size of that section should be 0. */
370 #endif /* CONFIG_SMP */
372 #ifdef CONFIG_MODULE_UNLOAD
373 /* Init the unload section of the module. */
374 static void module_unload_init(struct module
*mod
)
378 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
379 for (i
= 0; i
< NR_CPUS
; i
++)
380 local_set(&mod
->ref
[i
].count
, 0);
381 /* Hold reference count during initialization. */
382 local_set(&mod
->ref
[_smp_processor_id()].count
, 1);
383 /* Backwards compatibility macros put refcount during init. */
384 mod
->waiter
= current
;
387 /* modules using other modules */
390 struct list_head list
;
391 struct module
*module_which_uses
;
394 /* Does a already use b? */
395 static int already_uses(struct module
*a
, struct module
*b
)
397 struct module_use
*use
;
399 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
400 if (use
->module_which_uses
== a
) {
401 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
405 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
409 /* Module a uses b */
410 static int use_module(struct module
*a
, struct module
*b
)
412 struct module_use
*use
;
413 if (b
== NULL
|| already_uses(a
, b
)) return 1;
415 if (!strong_try_module_get(b
))
418 DEBUGP("Allocating new usage for %s.\n", a
->name
);
419 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
421 printk("%s: out of memory loading\n", a
->name
);
426 use
->module_which_uses
= a
;
427 list_add(&use
->list
, &b
->modules_which_use_me
);
431 /* Clear the unload stuff of the module. */
432 static void module_unload_free(struct module
*mod
)
436 list_for_each_entry(i
, &modules
, list
) {
437 struct module_use
*use
;
439 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
440 if (use
->module_which_uses
== mod
) {
441 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
443 list_del(&use
->list
);
445 /* There can be at most one match. */
452 #ifdef CONFIG_MODULE_FORCE_UNLOAD
453 static inline int try_force(unsigned int flags
)
455 int ret
= (flags
& O_TRUNC
);
457 tainted
|= TAINT_FORCED_MODULE
;
461 static inline int try_force(unsigned int flags
)
465 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
474 /* Whole machine is stopped with interrupts off when this runs. */
475 static int __try_stop_module(void *_sref
)
477 struct stopref
*sref
= _sref
;
479 /* If it's not unused, quit unless we are told to block. */
480 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
481 if (!(*sref
->forced
= try_force(sref
->flags
)))
485 /* Mark it as dying. */
486 sref
->mod
->state
= MODULE_STATE_GOING
;
490 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
492 struct stopref sref
= { mod
, flags
, forced
};
494 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
497 unsigned int module_refcount(struct module
*mod
)
499 unsigned int i
, total
= 0;
501 for (i
= 0; i
< NR_CPUS
; i
++)
502 total
+= local_read(&mod
->ref
[i
].count
);
505 EXPORT_SYMBOL(module_refcount
);
507 /* This exists whether we can unload or not */
508 static void free_module(struct module
*mod
);
510 static void wait_for_zero_refcount(struct module
*mod
)
512 /* Since we might sleep for some time, drop the semaphore first */
515 DEBUGP("Looking at refcount...\n");
516 set_current_state(TASK_UNINTERRUPTIBLE
);
517 if (module_refcount(mod
) == 0)
521 current
->state
= TASK_RUNNING
;
526 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
529 char name
[MODULE_NAME_LEN
];
532 if (!capable(CAP_SYS_MODULE
))
535 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
537 name
[MODULE_NAME_LEN
-1] = '\0';
539 if (down_interruptible(&module_mutex
) != 0)
542 mod
= find_module(name
);
548 if (!list_empty(&mod
->modules_which_use_me
)) {
549 /* Other modules depend on us: get rid of them first. */
554 /* Doing init or already dying? */
555 if (mod
->state
!= MODULE_STATE_LIVE
) {
556 /* FIXME: if (force), slam module count and wake up
558 DEBUGP("%s already dying\n", mod
->name
);
563 /* If it has an init func, it must have an exit func to unload */
564 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
566 forced
= try_force(flags
);
568 /* This module can't be removed */
574 /* Set this up before setting mod->state */
575 mod
->waiter
= current
;
577 /* Stop the machine so refcounts can't move and disable module. */
578 ret
= try_stop_module(mod
, flags
, &forced
);
582 /* Never wait if forced. */
583 if (!forced
&& module_refcount(mod
) != 0)
584 wait_for_zero_refcount(mod
);
586 /* Final destruction now noone is using it. */
587 if (mod
->exit
!= NULL
) {
599 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
601 struct module_use
*use
;
602 int printed_something
= 0;
604 seq_printf(m
, " %u ", module_refcount(mod
));
606 /* Always include a trailing , so userspace can differentiate
607 between this and the old multi-field proc format. */
608 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
609 printed_something
= 1;
610 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
614 printed_something
= 1;
615 seq_printf(m
, "[unsafe],");
618 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
619 printed_something
= 1;
620 seq_printf(m
, "[permanent],");
623 if (!printed_something
)
627 void __symbol_put(const char *symbol
)
629 struct module
*owner
;
631 const unsigned long *crc
;
633 spin_lock_irqsave(&modlist_lock
, flags
);
634 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
637 spin_unlock_irqrestore(&modlist_lock
, flags
);
639 EXPORT_SYMBOL(__symbol_put
);
641 void symbol_put_addr(void *addr
)
645 spin_lock_irqsave(&modlist_lock
, flags
);
646 if (!kernel_text_address((unsigned long)addr
))
649 module_put(module_text_address((unsigned long)addr
));
650 spin_unlock_irqrestore(&modlist_lock
, flags
);
652 EXPORT_SYMBOL_GPL(symbol_put_addr
);
654 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
655 struct module
*mod
, char *buffer
)
657 /* sysfs holds a reference */
658 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
661 static struct module_attribute refcnt
= {
662 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
666 #else /* !CONFIG_MODULE_UNLOAD */
667 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
669 /* We don't know the usage count, or what modules are using. */
670 seq_printf(m
, " - -");
673 static inline void module_unload_free(struct module
*mod
)
677 static inline int use_module(struct module
*a
, struct module
*b
)
679 return strong_try_module_get(b
);
682 static inline void module_unload_init(struct module
*mod
)
685 #endif /* CONFIG_MODULE_UNLOAD */
687 #ifdef CONFIG_OBSOLETE_MODPARM
688 /* Bounds checking done below */
689 static int obsparm_copy_string(const char *val
, struct kernel_param
*kp
)
691 strcpy(kp
->arg
, val
);
695 int set_obsolete(const char *val
, struct kernel_param
*kp
)
697 unsigned int min
, max
;
698 unsigned int size
, maxsize
;
702 struct obsolete_modparm
*obsparm
= kp
->arg
;
705 printk(KERN_ERR
"Parameter %s needs an argument\n", kp
->name
);
709 /* type is: [min[-max]]{b,h,i,l,s} */
711 min
= simple_strtol(p
, &endp
, 10);
712 if (endp
== obsparm
->type
)
714 else if (*endp
== '-') {
716 max
= simple_strtol(p
, &endp
, 10);
721 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
722 1, param_set_byte
, &dummy
);
724 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
725 sizeof(short), param_set_short
, &dummy
);
727 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
728 sizeof(int), param_set_int
, &dummy
);
730 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
731 sizeof(long), param_set_long
, &dummy
);
733 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
734 sizeof(char *), param_set_charp
, &dummy
);
737 /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars,
738 and the decl is "char xxx[5][50];" */
740 maxsize
= simple_strtol(p
, &endp
, 10);
741 /* We check lengths here (yes, this is a hack). */
743 while (p
[size
= strcspn(p
, ",")]) {
750 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
751 maxsize
, obsparm_copy_string
, &dummy
);
753 printk(KERN_ERR
"Unknown obsolete parameter type %s\n", obsparm
->type
);
757 "Parameter %s doesn't fit in %u chars.\n", kp
->name
, maxsize
);
761 static int obsolete_params(const char *name
,
763 struct obsolete_modparm obsparm
[],
766 unsigned int symindex
,
769 struct kernel_param
*kp
;
773 kp
= kmalloc(sizeof(kp
[0]) * num
, GFP_KERNEL
);
777 for (i
= 0; i
< num
; i
++) {
778 char sym_name
[128 + sizeof(MODULE_SYMBOL_PREFIX
)];
780 snprintf(sym_name
, sizeof(sym_name
), "%s%s",
781 MODULE_SYMBOL_PREFIX
, obsparm
[i
].name
);
783 kp
[i
].name
= obsparm
[i
].name
;
785 kp
[i
].set
= set_obsolete
;
788 = (void *)find_local_symbol(sechdrs
, symindex
, strtab
,
790 if (!obsparm
[i
].addr
) {
791 printk("%s: falsely claims to have parameter %s\n",
792 name
, obsparm
[i
].name
);
796 kp
[i
].arg
= &obsparm
[i
];
799 ret
= parse_args(name
, args
, kp
, num
, NULL
);
805 static int obsolete_params(const char *name
,
807 struct obsolete_modparm obsparm
[],
810 unsigned int symindex
,
814 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
818 #endif /* CONFIG_OBSOLETE_MODPARM */
820 static const char vermagic
[] = VERMAGIC_STRING
;
822 #ifdef CONFIG_MODVERSIONS
823 static int check_version(Elf_Shdr
*sechdrs
,
824 unsigned int versindex
,
827 const unsigned long *crc
)
829 unsigned int i
, num_versions
;
830 struct modversion_info
*versions
;
832 /* Exporting module didn't supply crcs? OK, we're already tainted. */
836 versions
= (void *) sechdrs
[versindex
].sh_addr
;
837 num_versions
= sechdrs
[versindex
].sh_size
838 / sizeof(struct modversion_info
);
840 for (i
= 0; i
< num_versions
; i
++) {
841 if (strcmp(versions
[i
].name
, symname
) != 0)
844 if (versions
[i
].crc
== *crc
)
846 printk("%s: disagrees about version of symbol %s\n",
848 DEBUGP("Found checksum %lX vs module %lX\n",
849 *crc
, versions
[i
].crc
);
852 /* Not in module's version table. OK, but that taints the kernel. */
853 if (!(tainted
& TAINT_FORCED_MODULE
)) {
854 printk("%s: no version for \"%s\" found: kernel tainted.\n",
856 tainted
|= TAINT_FORCED_MODULE
;
861 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
862 unsigned int versindex
,
865 const unsigned long *crc
;
866 struct module
*owner
;
868 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
870 return check_version(sechdrs
, versindex
, "struct_module", mod
,
874 /* First part is kernel version, which we ignore. */
875 static inline int same_magic(const char *amagic
, const char *bmagic
)
877 amagic
+= strcspn(amagic
, " ");
878 bmagic
+= strcspn(bmagic
, " ");
879 return strcmp(amagic
, bmagic
) == 0;
882 static inline int check_version(Elf_Shdr
*sechdrs
,
883 unsigned int versindex
,
886 const unsigned long *crc
)
891 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
892 unsigned int versindex
,
898 static inline int same_magic(const char *amagic
, const char *bmagic
)
900 return strcmp(amagic
, bmagic
) == 0;
902 #endif /* CONFIG_MODVERSIONS */
904 /* Resolve a symbol for this module. I.e. if we find one, record usage.
905 Must be holding module_mutex. */
906 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
907 unsigned int versindex
,
911 struct module
*owner
;
913 const unsigned long *crc
;
915 spin_lock_irq(&modlist_lock
);
916 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
918 /* use_module can fail due to OOM, or module unloading */
919 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
920 !use_module(mod
, owner
))
923 spin_unlock_irq(&modlist_lock
);
929 * /sys/module/foo/sections stuff
930 * J. Corbet <corbet@lwn.net>
932 #ifdef CONFIG_KALLSYMS
933 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
934 struct module
*mod
, char *buf
)
936 struct module_sect_attr
*sattr
=
937 container_of(mattr
, struct module_sect_attr
, mattr
);
938 return sprintf(buf
, "0x%lx\n", sattr
->address
);
941 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
942 char *secstrings
, Elf_Shdr
*sechdrs
)
944 unsigned int nloaded
= 0, i
, size
[2];
945 struct module_sect_attrs
*sect_attrs
;
946 struct module_sect_attr
*sattr
;
947 struct attribute
**gattr
;
949 /* Count loaded sections and allocate structures */
950 for (i
= 0; i
< nsect
; i
++)
951 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
953 size
[0] = ALIGN(sizeof(*sect_attrs
)
954 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
955 sizeof(sect_attrs
->grp
.attrs
[0]));
956 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
957 if (! (sect_attrs
= kmalloc(size
[0] + size
[1], GFP_KERNEL
)))
960 /* Setup section attributes. */
961 sect_attrs
->grp
.name
= "sections";
962 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
964 sattr
= §_attrs
->attrs
[0];
965 gattr
= §_attrs
->grp
.attrs
[0];
966 for (i
= 0; i
< nsect
; i
++) {
967 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
969 sattr
->address
= sechdrs
[i
].sh_addr
;
970 strlcpy(sattr
->name
, secstrings
+ sechdrs
[i
].sh_name
,
971 MODULE_SECT_NAME_LEN
);
972 sattr
->mattr
.show
= module_sect_show
;
973 sattr
->mattr
.store
= NULL
;
974 sattr
->mattr
.attr
.name
= sattr
->name
;
975 sattr
->mattr
.attr
.owner
= mod
;
976 sattr
->mattr
.attr
.mode
= S_IRUGO
;
977 *(gattr
++) = &(sattr
++)->mattr
.attr
;
981 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
984 mod
->sect_attrs
= sect_attrs
;
990 static void remove_sect_attrs(struct module
*mod
)
992 if (mod
->sect_attrs
) {
993 sysfs_remove_group(&mod
->mkobj
.kobj
,
994 &mod
->sect_attrs
->grp
);
995 /* We are positive that no one is using any sect attrs
996 * at this point. Deallocate immediately. */
997 kfree(mod
->sect_attrs
);
998 mod
->sect_attrs
= NULL
;
1004 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1005 char *sectstrings
, Elf_Shdr
*sechdrs
)
1009 static inline void remove_sect_attrs(struct module
*mod
)
1012 #endif /* CONFIG_KALLSYMS */
1015 #ifdef CONFIG_MODULE_UNLOAD
1016 static inline int module_add_refcnt_attr(struct module
*mod
)
1018 return sysfs_create_file(&mod
->mkobj
.kobj
, &refcnt
.attr
);
1020 static void module_remove_refcnt_attr(struct module
*mod
)
1022 return sysfs_remove_file(&mod
->mkobj
.kobj
, &refcnt
.attr
);
1025 static inline int module_add_refcnt_attr(struct module
*mod
)
1029 static void module_remove_refcnt_attr(struct module
*mod
)
1035 static int mod_sysfs_setup(struct module
*mod
,
1036 struct kernel_param
*kparam
,
1037 unsigned int num_params
)
1041 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1042 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1045 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1046 mod
->mkobj
.mod
= mod
;
1047 err
= kobject_register(&mod
->mkobj
.kobj
);
1051 err
= module_add_refcnt_attr(mod
);
1055 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1062 kobject_unregister(&mod
->mkobj
.kobj
);
1067 static void mod_kobject_remove(struct module
*mod
)
1069 module_remove_refcnt_attr(mod
);
1070 module_param_sysfs_remove(mod
);
1072 kobject_unregister(&mod
->mkobj
.kobj
);
1076 * unlink the module with the whole machine is stopped with interrupts off
1077 * - this defends against kallsyms not taking locks
1079 static int __unlink_module(void *_mod
)
1081 struct module
*mod
= _mod
;
1082 list_del(&mod
->list
);
1086 /* Free a module, remove from lists, etc (must hold module mutex). */
1087 static void free_module(struct module
*mod
)
1089 /* Delete from various lists */
1090 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1091 remove_sect_attrs(mod
);
1092 mod_kobject_remove(mod
);
1094 /* Arch-specific cleanup. */
1095 module_arch_cleanup(mod
);
1097 /* Module unload stuff */
1098 module_unload_free(mod
);
1100 /* This may be NULL, but that's OK */
1101 module_free(mod
, mod
->module_init
);
1104 percpu_modfree(mod
->percpu
);
1106 /* Finally, free the core (containing the module structure) */
1107 module_free(mod
, mod
->module_core
);
1110 void *__symbol_get(const char *symbol
)
1112 struct module
*owner
;
1113 unsigned long value
, flags
;
1114 const unsigned long *crc
;
1116 spin_lock_irqsave(&modlist_lock
, flags
);
1117 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1118 if (value
&& !strong_try_module_get(owner
))
1120 spin_unlock_irqrestore(&modlist_lock
, flags
);
1122 return (void *)value
;
1124 EXPORT_SYMBOL_GPL(__symbol_get
);
1126 /* Change all symbols so that sh_value encodes the pointer directly. */
1127 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1128 unsigned int symindex
,
1130 unsigned int versindex
,
1131 unsigned int pcpuindex
,
1134 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1135 unsigned long secbase
;
1136 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1139 for (i
= 1; i
< n
; i
++) {
1140 switch (sym
[i
].st_shndx
) {
1142 /* We compiled with -fno-common. These are not
1143 supposed to happen. */
1144 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1145 printk("%s: please compile with -fno-common\n",
1151 /* Don't need to do anything */
1152 DEBUGP("Absolute symbol: 0x%08lx\n",
1153 (long)sym
[i
].st_value
);
1158 = resolve_symbol(sechdrs
, versindex
,
1159 strtab
+ sym
[i
].st_name
, mod
);
1161 /* Ok if resolved. */
1162 if (sym
[i
].st_value
!= 0)
1165 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1168 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1169 mod
->name
, strtab
+ sym
[i
].st_name
);
1174 /* Divert to percpu allocation if a percpu var. */
1175 if (sym
[i
].st_shndx
== pcpuindex
)
1176 secbase
= (unsigned long)mod
->percpu
;
1178 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1179 sym
[i
].st_value
+= secbase
;
1187 /* Update size with this section: return offset. */
1188 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1192 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1193 *size
= ret
+ sechdr
->sh_size
;
1197 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1198 might -- code, read-only data, read-write data, small data. Tally
1199 sizes, and place the offsets into sh_entsize fields: high bit means it
1201 static void layout_sections(struct module
*mod
,
1202 const Elf_Ehdr
*hdr
,
1204 const char *secstrings
)
1206 static unsigned long const masks
[][2] = {
1207 /* NOTE: all executable code must be the first section
1208 * in this array; otherwise modify the text_size
1209 * finder in the two loops below */
1210 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1211 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1212 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1213 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1217 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1218 sechdrs
[i
].sh_entsize
= ~0UL;
1220 DEBUGP("Core section allocation order:\n");
1221 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1222 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1223 Elf_Shdr
*s
= &sechdrs
[i
];
1225 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1226 || (s
->sh_flags
& masks
[m
][1])
1227 || s
->sh_entsize
!= ~0UL
1228 || strncmp(secstrings
+ s
->sh_name
,
1231 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1232 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1235 mod
->core_text_size
= mod
->core_size
;
1238 DEBUGP("Init section allocation order:\n");
1239 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1240 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1241 Elf_Shdr
*s
= &sechdrs
[i
];
1243 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1244 || (s
->sh_flags
& masks
[m
][1])
1245 || s
->sh_entsize
!= ~0UL
1246 || strncmp(secstrings
+ s
->sh_name
,
1249 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1250 | INIT_OFFSET_MASK
);
1251 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1254 mod
->init_text_size
= mod
->init_size
;
1258 static inline int license_is_gpl_compatible(const char *license
)
1260 return (strcmp(license
, "GPL") == 0
1261 || strcmp(license
, "GPL v2") == 0
1262 || strcmp(license
, "GPL and additional rights") == 0
1263 || strcmp(license
, "Dual BSD/GPL") == 0
1264 || strcmp(license
, "Dual MPL/GPL") == 0);
1267 static void set_license(struct module
*mod
, const char *license
)
1270 license
= "unspecified";
1272 mod
->license_gplok
= license_is_gpl_compatible(license
);
1273 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1274 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1275 mod
->name
, license
);
1276 tainted
|= TAINT_PROPRIETARY_MODULE
;
1280 /* Parse tag=value strings from .modinfo section */
1281 static char *next_string(char *string
, unsigned long *secsize
)
1283 /* Skip non-zero chars */
1286 if ((*secsize
)-- <= 1)
1290 /* Skip any zero padding. */
1291 while (!string
[0]) {
1293 if ((*secsize
)-- <= 1)
1299 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1304 unsigned int taglen
= strlen(tag
);
1305 unsigned long size
= sechdrs
[info
].sh_size
;
1307 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1308 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1309 return p
+ taglen
+ 1;
1314 #ifdef CONFIG_KALLSYMS
1315 int is_exported(const char *name
, const struct module
*mod
)
1320 for (i
= 0; __start___ksymtab
+i
< __stop___ksymtab
; i
++)
1321 if (strcmp(__start___ksymtab
[i
].name
, name
) == 0)
1325 for (i
= 0; i
< mod
->num_syms
; i
++)
1326 if (strcmp(mod
->syms
[i
].name
, name
) == 0)
1332 static char elf_type(const Elf_Sym
*sym
,
1334 const char *secstrings
,
1337 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1338 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1343 if (sym
->st_shndx
== SHN_UNDEF
)
1345 if (sym
->st_shndx
== SHN_ABS
)
1347 if (sym
->st_shndx
>= SHN_LORESERVE
)
1349 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1351 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1352 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1353 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1355 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1360 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1361 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1366 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1367 ".debug", strlen(".debug")) == 0)
1372 static void add_kallsyms(struct module
*mod
,
1374 unsigned int symindex
,
1375 unsigned int strindex
,
1376 const char *secstrings
)
1380 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1381 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1382 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1384 /* Set types up while we still have access to sections. */
1385 for (i
= 0; i
< mod
->num_symtab
; i
++)
1386 mod
->symtab
[i
].st_info
1387 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1390 static inline void add_kallsyms(struct module
*mod
,
1392 unsigned int symindex
,
1393 unsigned int strindex
,
1394 const char *secstrings
)
1397 #endif /* CONFIG_KALLSYMS */
1399 /* Allocate and load the module: note that size of section 0 is always
1400 zero, and we rely on this for optional sections. */
1401 static struct module
*load_module(void __user
*umod
,
1403 const char __user
*uargs
)
1407 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1408 unsigned int i
, symindex
= 0, strindex
= 0, setupindex
, exindex
,
1409 exportindex
, modindex
, obsparmindex
, infoindex
, gplindex
,
1410 crcindex
, gplcrcindex
, versindex
, pcpuindex
;
1414 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1415 struct exception_table_entry
*extable
;
1417 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1419 if (len
< sizeof(*hdr
))
1420 return ERR_PTR(-ENOEXEC
);
1422 /* Suck in entire file: we'll want most of it. */
1423 /* vmalloc barfs on "unusual" numbers. Check here */
1424 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1425 return ERR_PTR(-ENOMEM
);
1426 if (copy_from_user(hdr
, umod
, len
) != 0) {
1431 /* Sanity checks against insmoding binaries or wrong arch,
1432 weird elf version */
1433 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1434 || hdr
->e_type
!= ET_REL
1435 || !elf_check_arch(hdr
)
1436 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1441 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1444 /* Convenience variables */
1445 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1446 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1447 sechdrs
[0].sh_addr
= 0;
1449 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1450 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1451 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1454 /* Mark all sections sh_addr with their address in the
1456 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1458 /* Internal symbols and strings. */
1459 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1461 strindex
= sechdrs
[i
].sh_link
;
1462 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1464 #ifndef CONFIG_MODULE_UNLOAD
1465 /* Don't load .exit sections */
1466 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1467 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1471 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1472 ".gnu.linkonce.this_module");
1474 printk(KERN_WARNING
"No module found in object\n");
1478 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1480 if (symindex
== 0) {
1481 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1487 /* Optional sections */
1488 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1489 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1490 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1491 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1492 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1493 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1494 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1495 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1496 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1497 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1499 /* Don't keep modinfo section */
1500 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1501 #ifdef CONFIG_KALLSYMS
1502 /* Keep symbol and string tables for decoding later. */
1503 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1504 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1507 /* Check module struct version now, before we try to use module. */
1508 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1513 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1514 /* This is allowed: modprobe --force will invalidate it. */
1516 tainted
|= TAINT_FORCED_MODULE
;
1517 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1519 } else if (!same_magic(modmagic
, vermagic
)) {
1520 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1521 mod
->name
, modmagic
, vermagic
);
1526 /* Now copy in args */
1527 arglen
= strlen_user(uargs
);
1532 args
= kmalloc(arglen
, GFP_KERNEL
);
1537 if (copy_from_user(args
, uargs
, arglen
) != 0) {
1542 if (find_module(mod
->name
)) {
1547 mod
->state
= MODULE_STATE_COMING
;
1549 /* Allow arches to frob section contents and sizes. */
1550 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1555 /* We have a special allocation for this section. */
1556 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1557 sechdrs
[pcpuindex
].sh_addralign
);
1562 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1563 mod
->percpu
= percpu
;
1566 /* Determine total sizes, and put offsets in sh_entsize. For now
1567 this is done generically; there doesn't appear to be any
1568 special cases for the architectures. */
1569 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1571 /* Do the allocs. */
1572 ptr
= module_alloc(mod
->core_size
);
1577 memset(ptr
, 0, mod
->core_size
);
1578 mod
->module_core
= ptr
;
1580 ptr
= module_alloc(mod
->init_size
);
1581 if (!ptr
&& mod
->init_size
) {
1585 memset(ptr
, 0, mod
->init_size
);
1586 mod
->module_init
= ptr
;
1588 /* Transfer each section which specifies SHF_ALLOC */
1589 DEBUGP("final section addresses:\n");
1590 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1593 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1596 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1597 dest
= mod
->module_init
1598 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1600 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1602 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1603 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1604 sechdrs
[i
].sh_size
);
1605 /* Update sh_addr to point to copy in image. */
1606 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1607 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1609 /* Module has been moved. */
1610 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1612 /* Now we've moved module, initialize linked lists, etc. */
1613 module_unload_init(mod
);
1615 /* Set up license info based on the info section */
1616 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1618 /* Fix up syms, so that st_value is a pointer to location. */
1619 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1624 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1625 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1626 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1628 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1629 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1630 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1632 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1634 #ifdef CONFIG_MODVERSIONS
1635 if ((mod
->num_syms
&& !crcindex
) ||
1636 (mod
->num_gpl_syms
&& !gplcrcindex
)) {
1637 printk(KERN_WARNING
"%s: No versions for exported symbols."
1638 " Tainting kernel.\n", mod
->name
);
1639 tainted
|= TAINT_FORCED_MODULE
;
1643 /* Now do relocations. */
1644 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1645 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1646 unsigned int info
= sechdrs
[i
].sh_info
;
1648 /* Not a valid relocation section? */
1649 if (info
>= hdr
->e_shnum
)
1652 /* Don't bother with non-allocated sections */
1653 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1656 if (sechdrs
[i
].sh_type
== SHT_REL
)
1657 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1658 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1659 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1665 /* Set up and sort exception table */
1666 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1667 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1668 sort_extable(extable
, extable
+ mod
->num_exentries
);
1670 /* Finally, copy percpu area over. */
1671 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1672 sechdrs
[pcpuindex
].sh_size
);
1674 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1676 err
= module_finalize(hdr
, sechdrs
, mod
);
1682 err
= obsolete_params(mod
->name
, mod
->args
,
1683 (struct obsolete_modparm
*)
1684 sechdrs
[obsparmindex
].sh_addr
,
1685 sechdrs
[obsparmindex
].sh_size
1686 / sizeof(struct obsolete_modparm
),
1688 (char *)sechdrs
[strindex
].sh_addr
);
1690 printk(KERN_WARNING
"%s: Ignoring new-style "
1691 "parameters in presence of obsolete ones\n",
1694 /* Size of section 0 is 0, so this works well if no params */
1695 err
= parse_args(mod
->name
, mod
->args
,
1696 (struct kernel_param
*)
1697 sechdrs
[setupindex
].sh_addr
,
1698 sechdrs
[setupindex
].sh_size
1699 / sizeof(struct kernel_param
),
1705 err
= mod_sysfs_setup(mod
,
1706 (struct kernel_param
*)
1707 sechdrs
[setupindex
].sh_addr
,
1708 sechdrs
[setupindex
].sh_size
1709 / sizeof(struct kernel_param
));
1712 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1714 /* Get rid of temporary copy */
1721 module_arch_cleanup(mod
);
1723 module_unload_free(mod
);
1724 module_free(mod
, mod
->module_init
);
1726 module_free(mod
, mod
->module_core
);
1729 percpu_modfree(percpu
);
1734 if (err
< 0) return ERR_PTR(err
);
1738 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1744 * link the module with the whole machine is stopped with interrupts off
1745 * - this defends against kallsyms not taking locks
1747 static int __link_module(void *_mod
)
1749 struct module
*mod
= _mod
;
1750 list_add(&mod
->list
, &modules
);
1754 /* This is where the real work happens */
1756 sys_init_module(void __user
*umod
,
1758 const char __user
*uargs
)
1763 /* Must have permission */
1764 if (!capable(CAP_SYS_MODULE
))
1767 /* Only one module load at a time, please */
1768 if (down_interruptible(&module_mutex
) != 0)
1771 /* Do all the hard work */
1772 mod
= load_module(umod
, len
, uargs
);
1775 return PTR_ERR(mod
);
1778 /* Flush the instruction cache, since we've played with text */
1779 if (mod
->module_init
)
1780 flush_icache_range((unsigned long)mod
->module_init
,
1781 (unsigned long)mod
->module_init
1783 flush_icache_range((unsigned long)mod
->module_core
,
1784 (unsigned long)mod
->module_core
+ mod
->core_size
);
1786 /* Now sew it into the lists. They won't access us, since
1787 strong_try_module_get() will fail. */
1788 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1790 /* Drop lock so they can recurse */
1793 down(¬ify_mutex
);
1794 notifier_call_chain(&module_notify_list
, MODULE_STATE_COMING
, mod
);
1797 /* Start the module */
1798 if (mod
->init
!= NULL
)
1801 /* Init routine failed: abort. Try to protect us from
1802 buggy refcounters. */
1803 mod
->state
= MODULE_STATE_GOING
;
1804 synchronize_sched();
1806 printk(KERN_ERR
"%s: module is now stuck!\n",
1810 down(&module_mutex
);
1817 /* Now it's a first class citizen! */
1818 down(&module_mutex
);
1819 mod
->state
= MODULE_STATE_LIVE
;
1820 /* Drop initial reference. */
1822 module_free(mod
, mod
->module_init
);
1823 mod
->module_init
= NULL
;
1825 mod
->init_text_size
= 0;
1831 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
1833 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
1836 #ifdef CONFIG_KALLSYMS
1838 * This ignores the intensely annoying "mapping symbols" found
1839 * in ARM ELF files: $a, $t and $d.
1841 static inline int is_arm_mapping_symbol(const char *str
)
1843 return str
[0] == '$' && strchr("atd", str
[1])
1844 && (str
[2] == '\0' || str
[2] == '.');
1847 static const char *get_ksymbol(struct module
*mod
,
1849 unsigned long *size
,
1850 unsigned long *offset
)
1852 unsigned int i
, best
= 0;
1853 unsigned long nextval
;
1855 /* At worse, next value is at end of module */
1856 if (within(addr
, mod
->module_init
, mod
->init_size
))
1857 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
1859 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
1861 /* Scan for closest preceeding symbol, and next symbol. (ELF
1862 starts real symbols at 1). */
1863 for (i
= 1; i
< mod
->num_symtab
; i
++) {
1864 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
1867 /* We ignore unnamed symbols: they're uninformative
1868 * and inserted at a whim. */
1869 if (mod
->symtab
[i
].st_value
<= addr
1870 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
1871 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1872 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1874 if (mod
->symtab
[i
].st_value
> addr
1875 && mod
->symtab
[i
].st_value
< nextval
1876 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1877 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1878 nextval
= mod
->symtab
[i
].st_value
;
1884 *size
= nextval
- mod
->symtab
[best
].st_value
;
1885 *offset
= addr
- mod
->symtab
[best
].st_value
;
1886 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
1889 /* For kallsyms to ask for address resolution. NULL means not found.
1890 We don't lock, as this is used for oops resolution and races are a
1892 const char *module_address_lookup(unsigned long addr
,
1893 unsigned long *size
,
1894 unsigned long *offset
,
1899 list_for_each_entry(mod
, &modules
, list
) {
1900 if (within(addr
, mod
->module_init
, mod
->init_size
)
1901 || within(addr
, mod
->module_core
, mod
->core_size
)) {
1902 *modname
= mod
->name
;
1903 return get_ksymbol(mod
, addr
, size
, offset
);
1909 struct module
*module_get_kallsym(unsigned int symnum
,
1910 unsigned long *value
,
1916 down(&module_mutex
);
1917 list_for_each_entry(mod
, &modules
, list
) {
1918 if (symnum
< mod
->num_symtab
) {
1919 *value
= mod
->symtab
[symnum
].st_value
;
1920 *type
= mod
->symtab
[symnum
].st_info
;
1922 mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
1927 symnum
-= mod
->num_symtab
;
1933 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
1937 for (i
= 0; i
< mod
->num_symtab
; i
++)
1938 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0)
1939 return mod
->symtab
[i
].st_value
;
1943 /* Look for this name: can be of form module:name. */
1944 unsigned long module_kallsyms_lookup_name(const char *name
)
1948 unsigned long ret
= 0;
1950 /* Don't lock: we're in enough trouble already. */
1951 if ((colon
= strchr(name
, ':')) != NULL
) {
1953 if ((mod
= find_module(name
)) != NULL
)
1954 ret
= mod_find_symname(mod
, colon
+1);
1957 list_for_each_entry(mod
, &modules
, list
)
1958 if ((ret
= mod_find_symname(mod
, name
)) != 0)
1963 #endif /* CONFIG_KALLSYMS */
1965 /* Called by the /proc file system to return a list of modules. */
1966 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
1968 struct list_head
*i
;
1971 down(&module_mutex
);
1972 list_for_each(i
, &modules
) {
1981 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1983 struct list_head
*i
= p
;
1985 if (i
->next
== &modules
)
1990 static void m_stop(struct seq_file
*m
, void *p
)
1995 static int m_show(struct seq_file
*m
, void *p
)
1997 struct module
*mod
= list_entry(p
, struct module
, list
);
1998 seq_printf(m
, "%s %lu",
1999 mod
->name
, mod
->init_size
+ mod
->core_size
);
2000 print_unload_info(m
, mod
);
2002 /* Informative for users. */
2003 seq_printf(m
, " %s",
2004 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2005 mod
->state
== MODULE_STATE_COMING
? "Loading":
2007 /* Used by oprofile and other similar tools. */
2008 seq_printf(m
, " 0x%p", mod
->module_core
);
2010 seq_printf(m
, "\n");
2014 /* Format: modulename size refcount deps address
2016 Where refcount is a number or -, and deps is a comma-separated list
2019 struct seq_operations modules_op
= {
2026 /* Given an address, look for it in the module exception tables. */
2027 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2029 unsigned long flags
;
2030 const struct exception_table_entry
*e
= NULL
;
2033 spin_lock_irqsave(&modlist_lock
, flags
);
2034 list_for_each_entry(mod
, &modules
, list
) {
2035 if (mod
->num_exentries
== 0)
2038 e
= search_extable(mod
->extable
,
2039 mod
->extable
+ mod
->num_exentries
- 1,
2044 spin_unlock_irqrestore(&modlist_lock
, flags
);
2046 /* Now, if we found one, we are running inside it now, hence
2047 we cannot unload the module, hence no refcnt needed. */
2051 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2052 struct module
*__module_text_address(unsigned long addr
)
2056 list_for_each_entry(mod
, &modules
, list
)
2057 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2058 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2063 struct module
*module_text_address(unsigned long addr
)
2066 unsigned long flags
;
2068 spin_lock_irqsave(&modlist_lock
, flags
);
2069 mod
= __module_text_address(addr
);
2070 spin_unlock_irqrestore(&modlist_lock
, flags
);
2075 /* Don't grab lock, we're oopsing. */
2076 void print_modules(void)
2080 printk("Modules linked in:");
2081 list_for_each_entry(mod
, &modules
, list
)
2082 printk(" %s", mod
->name
);
2086 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2091 /* Don't check return code; this call is idempotent */
2092 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2094 EXPORT_SYMBOL(module_add_driver
);
2096 void module_remove_driver(struct device_driver
*drv
)
2100 sysfs_remove_link(&drv
->kobj
, "module");
2102 EXPORT_SYMBOL(module_remove_driver
);
2104 #ifdef CONFIG_MODVERSIONS
2105 /* Generate the signature for struct module here, too, for modversions. */
2106 void struct_module(struct module
*mod
) { return; }
2107 EXPORT_SYMBOL(struct_module
);