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/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
26 #include <linux/elf.h>
27 #include <linux/seq_file.h>
28 #include <linux/syscalls.h>
29 #include <linux/fcntl.h>
30 #include <linux/rcupdate.h>
31 #include <linux/capability.h>
32 #include <linux/cpu.h>
33 #include <linux/moduleparam.h>
34 #include <linux/errno.h>
35 #include <linux/err.h>
36 #include <linux/vermagic.h>
37 #include <linux/notifier.h>
38 #include <linux/stop_machine.h>
39 #include <linux/device.h>
40 #include <linux/string.h>
41 #include <linux/sched.h>
42 #include <linux/mutex.h>
43 #include <asm/uaccess.h>
44 #include <asm/semaphore.h>
45 #include <asm/cacheflush.h>
50 #define DEBUGP(fmt , a...)
53 #ifndef ARCH_SHF_SMALL
54 #define ARCH_SHF_SMALL 0
57 /* If this is set, the section belongs in the init part of the module */
58 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
60 /* Protects module list */
61 static DEFINE_SPINLOCK(modlist_lock
);
63 /* List of modules, protected by module_mutex AND modlist_lock */
64 static DEFINE_MUTEX(module_mutex
);
65 static LIST_HEAD(modules
);
67 static DEFINE_MUTEX(notify_mutex
);
68 static struct notifier_block
* module_notify_list
;
70 int register_module_notifier(struct notifier_block
* nb
)
73 mutex_lock(¬ify_mutex
);
74 err
= notifier_chain_register(&module_notify_list
, nb
);
75 mutex_unlock(¬ify_mutex
);
78 EXPORT_SYMBOL(register_module_notifier
);
80 int unregister_module_notifier(struct notifier_block
* nb
)
83 mutex_lock(¬ify_mutex
);
84 err
= notifier_chain_unregister(&module_notify_list
, nb
);
85 mutex_unlock(¬ify_mutex
);
88 EXPORT_SYMBOL(unregister_module_notifier
);
90 /* We require a truly strong try_module_get() */
91 static inline int strong_try_module_get(struct module
*mod
)
93 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
95 return try_module_get(mod
);
98 /* A thread that wants to hold a reference to a module only while it
99 * is running can call ths to safely exit.
100 * nfsd and lockd use this.
102 void __module_put_and_exit(struct module
*mod
, long code
)
107 EXPORT_SYMBOL(__module_put_and_exit
);
109 /* Find a module section: 0 means not found. */
110 static unsigned int find_sec(Elf_Ehdr
*hdr
,
112 const char *secstrings
,
117 for (i
= 1; i
< hdr
->e_shnum
; i
++)
118 /* Alloc bit cleared means "ignore it." */
119 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
120 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
125 /* Provided by the linker */
126 extern const struct kernel_symbol __start___ksymtab
[];
127 extern const struct kernel_symbol __stop___ksymtab
[];
128 extern const struct kernel_symbol __start___ksymtab_gpl
[];
129 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
130 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
131 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
132 extern const unsigned long __start___kcrctab
[];
133 extern const unsigned long __start___kcrctab_gpl
[];
134 extern const unsigned long __start___kcrctab_gpl_future
[];
136 #ifndef CONFIG_MODVERSIONS
137 #define symversion(base, idx) NULL
139 #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL)
142 /* lookup symbol in given range of kernel_symbols */
143 static const struct kernel_symbol
*lookup_symbol(const char *name
,
144 const struct kernel_symbol
*start
,
145 const struct kernel_symbol
*stop
)
147 const struct kernel_symbol
*ks
= start
;
148 for (; ks
< stop
; ks
++)
149 if (strcmp(ks
->name
, name
) == 0)
154 /* Find a symbol, return value, crc and module which owns it */
155 static unsigned long __find_symbol(const char *name
,
156 struct module
**owner
,
157 const unsigned long **crc
,
161 const struct kernel_symbol
*ks
;
163 /* Core kernel first. */
165 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
167 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
171 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
172 __stop___ksymtab_gpl
);
174 *crc
= symversion(__start___kcrctab_gpl
,
175 (ks
- __start___ksymtab_gpl
));
179 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
180 __stop___ksymtab_gpl_future
);
183 printk(KERN_WARNING
"Symbol %s is being used "
184 "by a non-GPL module, which will not "
185 "be allowed in the future\n", name
);
186 printk(KERN_WARNING
"Please see the file "
187 "Documentation/feature-removal-schedule.txt "
188 "in the kernel source tree for more "
191 *crc
= symversion(__start___kcrctab_gpl_future
,
192 (ks
- __start___ksymtab_gpl_future
));
196 /* Now try modules. */
197 list_for_each_entry(mod
, &modules
, list
) {
199 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
201 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
206 ks
= lookup_symbol(name
, mod
->gpl_syms
,
207 mod
->gpl_syms
+ mod
->num_gpl_syms
);
209 *crc
= symversion(mod
->gpl_crcs
,
210 (ks
- mod
->gpl_syms
));
214 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
215 (mod
->gpl_future_syms
+
216 mod
->num_gpl_future_syms
));
219 printk(KERN_WARNING
"Symbol %s is being used "
220 "by a non-GPL module, which will not "
221 "be allowed in the future\n", name
);
222 printk(KERN_WARNING
"Please see the file "
223 "Documentation/feature-removal-schedule.txt "
224 "in the kernel source tree for more "
227 *crc
= symversion(mod
->gpl_future_crcs
,
228 (ks
- mod
->gpl_future_syms
));
232 DEBUGP("Failed to find symbol %s\n", name
);
236 /* Find a symbol in this elf symbol table */
237 static unsigned long find_local_symbol(Elf_Shdr
*sechdrs
,
238 unsigned int symindex
,
243 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
245 /* Search (defined) internal symbols first. */
246 for (i
= 1; i
< sechdrs
[symindex
].sh_size
/sizeof(*sym
); i
++) {
247 if (sym
[i
].st_shndx
!= SHN_UNDEF
248 && strcmp(name
, strtab
+ sym
[i
].st_name
) == 0)
249 return sym
[i
].st_value
;
254 /* Search for module by name: must hold module_mutex. */
255 static struct module
*find_module(const char *name
)
259 list_for_each_entry(mod
, &modules
, list
) {
260 if (strcmp(mod
->name
, name
) == 0)
267 /* Number of blocks used and allocated. */
268 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
269 /* Size of each block. -ve means used. */
270 static int *pcpu_size
;
272 static int split_block(unsigned int i
, unsigned short size
)
274 /* Reallocation required? */
275 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
276 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
281 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
282 pcpu_num_allocated
*= 2;
287 /* Insert a new subblock */
288 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
289 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
292 pcpu_size
[i
+1] -= size
;
297 static inline unsigned int block_size(int val
)
304 /* Created by linker magic */
305 extern char __per_cpu_start
[], __per_cpu_end
[];
307 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
314 if (align
> SMP_CACHE_BYTES
) {
315 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
316 name
, align
, SMP_CACHE_BYTES
);
317 align
= SMP_CACHE_BYTES
;
320 ptr
= __per_cpu_start
;
321 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
322 /* Extra for alignment requirement. */
323 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
324 BUG_ON(i
== 0 && extra
!= 0);
326 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
329 /* Transfer extra to previous block. */
330 if (pcpu_size
[i
-1] < 0)
331 pcpu_size
[i
-1] -= extra
;
333 pcpu_size
[i
-1] += extra
;
334 pcpu_size
[i
] -= extra
;
337 /* Split block if warranted */
338 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
339 if (!split_block(i
, size
))
343 pcpu_size
[i
] = -pcpu_size
[i
];
347 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
352 static void percpu_modfree(void *freeme
)
355 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
357 /* First entry is core kernel percpu data. */
358 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
360 pcpu_size
[i
] = -pcpu_size
[i
];
367 /* Merge with previous? */
368 if (pcpu_size
[i
-1] >= 0) {
369 pcpu_size
[i
-1] += pcpu_size
[i
];
371 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
372 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
375 /* Merge with next? */
376 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
377 pcpu_size
[i
] += pcpu_size
[i
+1];
379 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
380 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
384 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
386 const char *secstrings
)
388 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
391 static int percpu_modinit(void)
394 pcpu_num_allocated
= 2;
395 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
397 /* Static in-kernel percpu data (used). */
398 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
400 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
401 if (pcpu_size
[1] < 0) {
402 printk(KERN_ERR
"No per-cpu room for modules.\n");
408 __initcall(percpu_modinit
);
409 #else /* ... !CONFIG_SMP */
410 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
415 static inline void percpu_modfree(void *pcpuptr
)
419 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
421 const char *secstrings
)
425 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
428 /* pcpusec should be 0, and size of that section should be 0. */
431 #endif /* CONFIG_SMP */
433 #define MODINFO_ATTR(field) \
434 static void setup_modinfo_##field(struct module *mod, const char *s) \
436 mod->field = kstrdup(s, GFP_KERNEL); \
438 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
439 struct module *mod, char *buffer) \
441 return sprintf(buffer, "%s\n", mod->field); \
443 static int modinfo_##field##_exists(struct module *mod) \
445 return mod->field != NULL; \
447 static void free_modinfo_##field(struct module *mod) \
452 static struct module_attribute modinfo_##field = { \
453 .attr = { .name = __stringify(field), .mode = 0444, \
454 .owner = THIS_MODULE }, \
455 .show = show_modinfo_##field, \
456 .setup = setup_modinfo_##field, \
457 .test = modinfo_##field##_exists, \
458 .free = free_modinfo_##field, \
461 MODINFO_ATTR(version
);
462 MODINFO_ATTR(srcversion
);
464 #ifdef CONFIG_MODULE_UNLOAD
465 /* Init the unload section of the module. */
466 static void module_unload_init(struct module
*mod
)
470 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
471 for (i
= 0; i
< NR_CPUS
; i
++)
472 local_set(&mod
->ref
[i
].count
, 0);
473 /* Hold reference count during initialization. */
474 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
475 /* Backwards compatibility macros put refcount during init. */
476 mod
->waiter
= current
;
479 /* modules using other modules */
482 struct list_head list
;
483 struct module
*module_which_uses
;
486 /* Does a already use b? */
487 static int already_uses(struct module
*a
, struct module
*b
)
489 struct module_use
*use
;
491 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
492 if (use
->module_which_uses
== a
) {
493 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
497 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
501 /* Module a uses b */
502 static int use_module(struct module
*a
, struct module
*b
)
504 struct module_use
*use
;
505 if (b
== NULL
|| already_uses(a
, b
)) return 1;
507 if (!strong_try_module_get(b
))
510 DEBUGP("Allocating new usage for %s.\n", a
->name
);
511 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
513 printk("%s: out of memory loading\n", a
->name
);
518 use
->module_which_uses
= a
;
519 list_add(&use
->list
, &b
->modules_which_use_me
);
523 /* Clear the unload stuff of the module. */
524 static void module_unload_free(struct module
*mod
)
528 list_for_each_entry(i
, &modules
, list
) {
529 struct module_use
*use
;
531 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
532 if (use
->module_which_uses
== mod
) {
533 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
535 list_del(&use
->list
);
537 /* There can be at most one match. */
544 #ifdef CONFIG_MODULE_FORCE_UNLOAD
545 static inline int try_force_unload(unsigned int flags
)
547 int ret
= (flags
& O_TRUNC
);
549 add_taint(TAINT_FORCED_RMMOD
);
553 static inline int try_force_unload(unsigned int flags
)
557 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
566 /* Whole machine is stopped with interrupts off when this runs. */
567 static int __try_stop_module(void *_sref
)
569 struct stopref
*sref
= _sref
;
571 /* If it's not unused, quit unless we are told to block. */
572 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
573 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
577 /* Mark it as dying. */
578 sref
->mod
->state
= MODULE_STATE_GOING
;
582 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
584 struct stopref sref
= { mod
, flags
, forced
};
586 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
589 unsigned int module_refcount(struct module
*mod
)
591 unsigned int i
, total
= 0;
593 for (i
= 0; i
< NR_CPUS
; i
++)
594 total
+= local_read(&mod
->ref
[i
].count
);
597 EXPORT_SYMBOL(module_refcount
);
599 /* This exists whether we can unload or not */
600 static void free_module(struct module
*mod
);
602 static void wait_for_zero_refcount(struct module
*mod
)
604 /* Since we might sleep for some time, drop the semaphore first */
605 mutex_unlock(&module_mutex
);
607 DEBUGP("Looking at refcount...\n");
608 set_current_state(TASK_UNINTERRUPTIBLE
);
609 if (module_refcount(mod
) == 0)
613 current
->state
= TASK_RUNNING
;
614 mutex_lock(&module_mutex
);
618 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
621 char name
[MODULE_NAME_LEN
];
624 if (!capable(CAP_SYS_MODULE
))
627 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
629 name
[MODULE_NAME_LEN
-1] = '\0';
631 if (mutex_lock_interruptible(&module_mutex
) != 0)
634 mod
= find_module(name
);
640 if (!list_empty(&mod
->modules_which_use_me
)) {
641 /* Other modules depend on us: get rid of them first. */
646 /* Doing init or already dying? */
647 if (mod
->state
!= MODULE_STATE_LIVE
) {
648 /* FIXME: if (force), slam module count and wake up
650 DEBUGP("%s already dying\n", mod
->name
);
655 /* If it has an init func, it must have an exit func to unload */
656 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
658 forced
= try_force_unload(flags
);
660 /* This module can't be removed */
666 /* Set this up before setting mod->state */
667 mod
->waiter
= current
;
669 /* Stop the machine so refcounts can't move and disable module. */
670 ret
= try_stop_module(mod
, flags
, &forced
);
674 /* Never wait if forced. */
675 if (!forced
&& module_refcount(mod
) != 0)
676 wait_for_zero_refcount(mod
);
678 /* Final destruction now noone is using it. */
679 if (mod
->exit
!= NULL
) {
680 mutex_unlock(&module_mutex
);
682 mutex_lock(&module_mutex
);
687 mutex_unlock(&module_mutex
);
691 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
693 struct module_use
*use
;
694 int printed_something
= 0;
696 seq_printf(m
, " %u ", module_refcount(mod
));
698 /* Always include a trailing , so userspace can differentiate
699 between this and the old multi-field proc format. */
700 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
701 printed_something
= 1;
702 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
706 printed_something
= 1;
707 seq_printf(m
, "[unsafe],");
710 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
711 printed_something
= 1;
712 seq_printf(m
, "[permanent],");
715 if (!printed_something
)
719 void __symbol_put(const char *symbol
)
721 struct module
*owner
;
723 const unsigned long *crc
;
725 spin_lock_irqsave(&modlist_lock
, flags
);
726 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
729 spin_unlock_irqrestore(&modlist_lock
, flags
);
731 EXPORT_SYMBOL(__symbol_put
);
733 void symbol_put_addr(void *addr
)
737 spin_lock_irqsave(&modlist_lock
, flags
);
738 if (!kernel_text_address((unsigned long)addr
))
741 module_put(module_text_address((unsigned long)addr
));
742 spin_unlock_irqrestore(&modlist_lock
, flags
);
744 EXPORT_SYMBOL_GPL(symbol_put_addr
);
746 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
747 struct module
*mod
, char *buffer
)
749 /* sysfs holds a reference */
750 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
753 static struct module_attribute refcnt
= {
754 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
758 #else /* !CONFIG_MODULE_UNLOAD */
759 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
761 /* We don't know the usage count, or what modules are using. */
762 seq_printf(m
, " - -");
765 static inline void module_unload_free(struct module
*mod
)
769 static inline int use_module(struct module
*a
, struct module
*b
)
771 return strong_try_module_get(b
);
774 static inline void module_unload_init(struct module
*mod
)
777 #endif /* CONFIG_MODULE_UNLOAD */
779 static struct module_attribute
*modinfo_attrs
[] = {
782 #ifdef CONFIG_MODULE_UNLOAD
788 #ifdef CONFIG_OBSOLETE_MODPARM
789 /* Bounds checking done below */
790 static int obsparm_copy_string(const char *val
, struct kernel_param
*kp
)
792 strcpy(kp
->arg
, val
);
796 static int set_obsolete(const char *val
, struct kernel_param
*kp
)
798 unsigned int min
, max
;
799 unsigned int size
, maxsize
;
803 struct obsolete_modparm
*obsparm
= kp
->arg
;
806 printk(KERN_ERR
"Parameter %s needs an argument\n", kp
->name
);
810 /* type is: [min[-max]]{b,h,i,l,s} */
812 min
= simple_strtol(p
, &endp
, 10);
813 if (endp
== obsparm
->type
)
815 else if (*endp
== '-') {
817 max
= simple_strtol(p
, &endp
, 10);
822 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
823 1, param_set_byte
, &dummy
);
825 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
826 sizeof(short), param_set_short
, &dummy
);
828 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
829 sizeof(int), param_set_int
, &dummy
);
831 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
832 sizeof(long), param_set_long
, &dummy
);
834 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
835 sizeof(char *), param_set_charp
, &dummy
);
838 /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars,
839 and the decl is "char xxx[5][50];" */
841 maxsize
= simple_strtol(p
, &endp
, 10);
842 /* We check lengths here (yes, this is a hack). */
844 while (p
[size
= strcspn(p
, ",")]) {
851 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
852 maxsize
, obsparm_copy_string
, &dummy
);
854 printk(KERN_ERR
"Unknown obsolete parameter type %s\n", obsparm
->type
);
858 "Parameter %s doesn't fit in %u chars.\n", kp
->name
, maxsize
);
862 static int obsolete_params(const char *name
,
864 struct obsolete_modparm obsparm
[],
867 unsigned int symindex
,
870 struct kernel_param
*kp
;
874 kp
= kmalloc(sizeof(kp
[0]) * num
, GFP_KERNEL
);
878 for (i
= 0; i
< num
; i
++) {
879 char sym_name
[128 + sizeof(MODULE_SYMBOL_PREFIX
)];
881 snprintf(sym_name
, sizeof(sym_name
), "%s%s",
882 MODULE_SYMBOL_PREFIX
, obsparm
[i
].name
);
884 kp
[i
].name
= obsparm
[i
].name
;
886 kp
[i
].set
= set_obsolete
;
889 = (void *)find_local_symbol(sechdrs
, symindex
, strtab
,
891 if (!obsparm
[i
].addr
) {
892 printk("%s: falsely claims to have parameter %s\n",
893 name
, obsparm
[i
].name
);
897 kp
[i
].arg
= &obsparm
[i
];
900 ret
= parse_args(name
, args
, kp
, num
, NULL
);
906 static int obsolete_params(const char *name
,
908 struct obsolete_modparm obsparm
[],
911 unsigned int symindex
,
915 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
919 #endif /* CONFIG_OBSOLETE_MODPARM */
921 static const char vermagic
[] = VERMAGIC_STRING
;
923 #ifdef CONFIG_MODVERSIONS
924 static int check_version(Elf_Shdr
*sechdrs
,
925 unsigned int versindex
,
928 const unsigned long *crc
)
930 unsigned int i
, num_versions
;
931 struct modversion_info
*versions
;
933 /* Exporting module didn't supply crcs? OK, we're already tainted. */
937 versions
= (void *) sechdrs
[versindex
].sh_addr
;
938 num_versions
= sechdrs
[versindex
].sh_size
939 / sizeof(struct modversion_info
);
941 for (i
= 0; i
< num_versions
; i
++) {
942 if (strcmp(versions
[i
].name
, symname
) != 0)
945 if (versions
[i
].crc
== *crc
)
947 printk("%s: disagrees about version of symbol %s\n",
949 DEBUGP("Found checksum %lX vs module %lX\n",
950 *crc
, versions
[i
].crc
);
953 /* Not in module's version table. OK, but that taints the kernel. */
954 if (!(tainted
& TAINT_FORCED_MODULE
)) {
955 printk("%s: no version for \"%s\" found: kernel tainted.\n",
957 add_taint(TAINT_FORCED_MODULE
);
962 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
963 unsigned int versindex
,
966 const unsigned long *crc
;
967 struct module
*owner
;
969 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
971 return check_version(sechdrs
, versindex
, "struct_module", mod
,
975 /* First part is kernel version, which we ignore. */
976 static inline int same_magic(const char *amagic
, const char *bmagic
)
978 amagic
+= strcspn(amagic
, " ");
979 bmagic
+= strcspn(bmagic
, " ");
980 return strcmp(amagic
, bmagic
) == 0;
983 static inline int check_version(Elf_Shdr
*sechdrs
,
984 unsigned int versindex
,
987 const unsigned long *crc
)
992 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
993 unsigned int versindex
,
999 static inline int same_magic(const char *amagic
, const char *bmagic
)
1001 return strcmp(amagic
, bmagic
) == 0;
1003 #endif /* CONFIG_MODVERSIONS */
1005 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1006 Must be holding module_mutex. */
1007 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
1008 unsigned int versindex
,
1012 struct module
*owner
;
1014 const unsigned long *crc
;
1016 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
1018 /* use_module can fail due to OOM, or module unloading */
1019 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
1020 !use_module(mod
, owner
))
1028 * /sys/module/foo/sections stuff
1029 * J. Corbet <corbet@lwn.net>
1031 #ifdef CONFIG_KALLSYMS
1032 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1033 struct module
*mod
, char *buf
)
1035 struct module_sect_attr
*sattr
=
1036 container_of(mattr
, struct module_sect_attr
, mattr
);
1037 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1040 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1041 char *secstrings
, Elf_Shdr
*sechdrs
)
1043 unsigned int nloaded
= 0, i
, size
[2];
1044 struct module_sect_attrs
*sect_attrs
;
1045 struct module_sect_attr
*sattr
;
1046 struct attribute
**gattr
;
1048 /* Count loaded sections and allocate structures */
1049 for (i
= 0; i
< nsect
; i
++)
1050 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1052 size
[0] = ALIGN(sizeof(*sect_attrs
)
1053 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1054 sizeof(sect_attrs
->grp
.attrs
[0]));
1055 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1056 if (! (sect_attrs
= kmalloc(size
[0] + size
[1], GFP_KERNEL
)))
1059 /* Setup section attributes. */
1060 sect_attrs
->grp
.name
= "sections";
1061 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1063 sattr
= §_attrs
->attrs
[0];
1064 gattr
= §_attrs
->grp
.attrs
[0];
1065 for (i
= 0; i
< nsect
; i
++) {
1066 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1068 sattr
->address
= sechdrs
[i
].sh_addr
;
1069 strlcpy(sattr
->name
, secstrings
+ sechdrs
[i
].sh_name
,
1070 MODULE_SECT_NAME_LEN
);
1071 sattr
->mattr
.show
= module_sect_show
;
1072 sattr
->mattr
.store
= NULL
;
1073 sattr
->mattr
.attr
.name
= sattr
->name
;
1074 sattr
->mattr
.attr
.owner
= mod
;
1075 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1076 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1080 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1083 mod
->sect_attrs
= sect_attrs
;
1089 static void remove_sect_attrs(struct module
*mod
)
1091 if (mod
->sect_attrs
) {
1092 sysfs_remove_group(&mod
->mkobj
.kobj
,
1093 &mod
->sect_attrs
->grp
);
1094 /* We are positive that no one is using any sect attrs
1095 * at this point. Deallocate immediately. */
1096 kfree(mod
->sect_attrs
);
1097 mod
->sect_attrs
= NULL
;
1103 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1104 char *sectstrings
, Elf_Shdr
*sechdrs
)
1108 static inline void remove_sect_attrs(struct module
*mod
)
1111 #endif /* CONFIG_KALLSYMS */
1113 static int module_add_modinfo_attrs(struct module
*mod
)
1115 struct module_attribute
*attr
;
1116 struct module_attribute
*temp_attr
;
1120 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1121 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1123 if (!mod
->modinfo_attrs
)
1126 temp_attr
= mod
->modinfo_attrs
;
1127 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1129 (attr
->test
&& attr
->test(mod
))) {
1130 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1131 temp_attr
->attr
.owner
= mod
;
1132 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1139 static void module_remove_modinfo_attrs(struct module
*mod
)
1141 struct module_attribute
*attr
;
1144 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1145 /* pick a field to test for end of list */
1146 if (!attr
->attr
.name
)
1148 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1152 kfree(mod
->modinfo_attrs
);
1155 static int mod_sysfs_setup(struct module
*mod
,
1156 struct kernel_param
*kparam
,
1157 unsigned int num_params
)
1161 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1162 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1165 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1166 mod
->mkobj
.mod
= mod
;
1167 err
= kobject_register(&mod
->mkobj
.kobj
);
1171 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1175 err
= module_add_modinfo_attrs(mod
);
1182 kobject_unregister(&mod
->mkobj
.kobj
);
1187 static void mod_kobject_remove(struct module
*mod
)
1189 module_remove_modinfo_attrs(mod
);
1190 module_param_sysfs_remove(mod
);
1192 kobject_unregister(&mod
->mkobj
.kobj
);
1196 * unlink the module with the whole machine is stopped with interrupts off
1197 * - this defends against kallsyms not taking locks
1199 static int __unlink_module(void *_mod
)
1201 struct module
*mod
= _mod
;
1202 list_del(&mod
->list
);
1206 /* Free a module, remove from lists, etc (must hold module mutex). */
1207 static void free_module(struct module
*mod
)
1209 /* Delete from various lists */
1210 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1211 remove_sect_attrs(mod
);
1212 mod_kobject_remove(mod
);
1214 /* Arch-specific cleanup. */
1215 module_arch_cleanup(mod
);
1217 /* Module unload stuff */
1218 module_unload_free(mod
);
1220 /* This may be NULL, but that's OK */
1221 module_free(mod
, mod
->module_init
);
1224 percpu_modfree(mod
->percpu
);
1226 /* Finally, free the core (containing the module structure) */
1227 module_free(mod
, mod
->module_core
);
1230 void *__symbol_get(const char *symbol
)
1232 struct module
*owner
;
1233 unsigned long value
, flags
;
1234 const unsigned long *crc
;
1236 spin_lock_irqsave(&modlist_lock
, flags
);
1237 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1238 if (value
&& !strong_try_module_get(owner
))
1240 spin_unlock_irqrestore(&modlist_lock
, flags
);
1242 return (void *)value
;
1244 EXPORT_SYMBOL_GPL(__symbol_get
);
1247 * Ensure that an exported symbol [global namespace] does not already exist
1248 * in the Kernel or in some other modules exported symbol table.
1250 static int verify_export_symbols(struct module
*mod
)
1252 const char *name
= NULL
;
1253 unsigned long i
, ret
= 0;
1254 struct module
*owner
;
1255 const unsigned long *crc
;
1257 for (i
= 0; i
< mod
->num_syms
; i
++)
1258 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1259 name
= mod
->syms
[i
].name
;
1264 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1265 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1266 name
= mod
->gpl_syms
[i
].name
;
1273 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1274 mod
->name
, name
, module_name(owner
));
1279 /* Change all symbols so that sh_value encodes the pointer directly. */
1280 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1281 unsigned int symindex
,
1283 unsigned int versindex
,
1284 unsigned int pcpuindex
,
1287 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1288 unsigned long secbase
;
1289 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1292 for (i
= 1; i
< n
; i
++) {
1293 switch (sym
[i
].st_shndx
) {
1295 /* We compiled with -fno-common. These are not
1296 supposed to happen. */
1297 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1298 printk("%s: please compile with -fno-common\n",
1304 /* Don't need to do anything */
1305 DEBUGP("Absolute symbol: 0x%08lx\n",
1306 (long)sym
[i
].st_value
);
1311 = resolve_symbol(sechdrs
, versindex
,
1312 strtab
+ sym
[i
].st_name
, mod
);
1314 /* Ok if resolved. */
1315 if (sym
[i
].st_value
!= 0)
1318 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1321 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1322 mod
->name
, strtab
+ sym
[i
].st_name
);
1327 /* Divert to percpu allocation if a percpu var. */
1328 if (sym
[i
].st_shndx
== pcpuindex
)
1329 secbase
= (unsigned long)mod
->percpu
;
1331 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1332 sym
[i
].st_value
+= secbase
;
1340 /* Update size with this section: return offset. */
1341 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1345 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1346 *size
= ret
+ sechdr
->sh_size
;
1350 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1351 might -- code, read-only data, read-write data, small data. Tally
1352 sizes, and place the offsets into sh_entsize fields: high bit means it
1354 static void layout_sections(struct module
*mod
,
1355 const Elf_Ehdr
*hdr
,
1357 const char *secstrings
)
1359 static unsigned long const masks
[][2] = {
1360 /* NOTE: all executable code must be the first section
1361 * in this array; otherwise modify the text_size
1362 * finder in the two loops below */
1363 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1364 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1365 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1366 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1370 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1371 sechdrs
[i
].sh_entsize
= ~0UL;
1373 DEBUGP("Core section allocation order:\n");
1374 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1375 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1376 Elf_Shdr
*s
= &sechdrs
[i
];
1378 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1379 || (s
->sh_flags
& masks
[m
][1])
1380 || s
->sh_entsize
!= ~0UL
1381 || strncmp(secstrings
+ s
->sh_name
,
1384 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1385 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1388 mod
->core_text_size
= mod
->core_size
;
1391 DEBUGP("Init section allocation order:\n");
1392 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1393 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1394 Elf_Shdr
*s
= &sechdrs
[i
];
1396 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1397 || (s
->sh_flags
& masks
[m
][1])
1398 || s
->sh_entsize
!= ~0UL
1399 || strncmp(secstrings
+ s
->sh_name
,
1402 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1403 | INIT_OFFSET_MASK
);
1404 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1407 mod
->init_text_size
= mod
->init_size
;
1411 static inline int license_is_gpl_compatible(const char *license
)
1413 return (strcmp(license
, "GPL") == 0
1414 || strcmp(license
, "GPL v2") == 0
1415 || strcmp(license
, "GPL and additional rights") == 0
1416 || strcmp(license
, "Dual BSD/GPL") == 0
1417 || strcmp(license
, "Dual MPL/GPL") == 0);
1420 static void set_license(struct module
*mod
, const char *license
)
1423 license
= "unspecified";
1425 mod
->license_gplok
= license_is_gpl_compatible(license
);
1426 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1427 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1428 mod
->name
, license
);
1429 add_taint(TAINT_PROPRIETARY_MODULE
);
1433 /* Parse tag=value strings from .modinfo section */
1434 static char *next_string(char *string
, unsigned long *secsize
)
1436 /* Skip non-zero chars */
1439 if ((*secsize
)-- <= 1)
1443 /* Skip any zero padding. */
1444 while (!string
[0]) {
1446 if ((*secsize
)-- <= 1)
1452 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1457 unsigned int taglen
= strlen(tag
);
1458 unsigned long size
= sechdrs
[info
].sh_size
;
1460 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1461 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1462 return p
+ taglen
+ 1;
1467 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1468 unsigned int infoindex
)
1470 struct module_attribute
*attr
;
1473 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1476 get_modinfo(sechdrs
,
1482 #ifdef CONFIG_KALLSYMS
1483 int is_exported(const char *name
, const struct module
*mod
)
1485 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1488 if (lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1495 static char elf_type(const Elf_Sym
*sym
,
1497 const char *secstrings
,
1500 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1501 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1506 if (sym
->st_shndx
== SHN_UNDEF
)
1508 if (sym
->st_shndx
== SHN_ABS
)
1510 if (sym
->st_shndx
>= SHN_LORESERVE
)
1512 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1514 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1515 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1516 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1518 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1523 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1524 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1529 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1530 ".debug", strlen(".debug")) == 0)
1535 static void add_kallsyms(struct module
*mod
,
1537 unsigned int symindex
,
1538 unsigned int strindex
,
1539 const char *secstrings
)
1543 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1544 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1545 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1547 /* Set types up while we still have access to sections. */
1548 for (i
= 0; i
< mod
->num_symtab
; i
++)
1549 mod
->symtab
[i
].st_info
1550 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1553 static inline void add_kallsyms(struct module
*mod
,
1555 unsigned int symindex
,
1556 unsigned int strindex
,
1557 const char *secstrings
)
1560 #endif /* CONFIG_KALLSYMS */
1562 /* Allocate and load the module: note that size of section 0 is always
1563 zero, and we rely on this for optional sections. */
1564 static struct module
*load_module(void __user
*umod
,
1566 const char __user
*uargs
)
1570 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1571 unsigned int i
, symindex
= 0, strindex
= 0, setupindex
, exindex
,
1572 exportindex
, modindex
, obsparmindex
, infoindex
, gplindex
,
1573 crcindex
, gplcrcindex
, versindex
, pcpuindex
, gplfutureindex
,
1578 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1579 struct exception_table_entry
*extable
;
1580 mm_segment_t old_fs
;
1582 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1584 if (len
< sizeof(*hdr
))
1585 return ERR_PTR(-ENOEXEC
);
1587 /* Suck in entire file: we'll want most of it. */
1588 /* vmalloc barfs on "unusual" numbers. Check here */
1589 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1590 return ERR_PTR(-ENOMEM
);
1591 if (copy_from_user(hdr
, umod
, len
) != 0) {
1596 /* Sanity checks against insmoding binaries or wrong arch,
1597 weird elf version */
1598 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1599 || hdr
->e_type
!= ET_REL
1600 || !elf_check_arch(hdr
)
1601 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1606 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1609 /* Convenience variables */
1610 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1611 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1612 sechdrs
[0].sh_addr
= 0;
1614 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1615 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1616 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1619 /* Mark all sections sh_addr with their address in the
1621 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1623 /* Internal symbols and strings. */
1624 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1626 strindex
= sechdrs
[i
].sh_link
;
1627 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1629 #ifndef CONFIG_MODULE_UNLOAD
1630 /* Don't load .exit sections */
1631 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1632 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1636 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1637 ".gnu.linkonce.this_module");
1639 printk(KERN_WARNING
"No module found in object\n");
1643 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1645 if (symindex
== 0) {
1646 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1652 /* Optional sections */
1653 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1654 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1655 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1656 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1657 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1658 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1659 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1660 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1661 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1662 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1663 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1664 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1666 /* Don't keep modinfo section */
1667 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1668 #ifdef CONFIG_KALLSYMS
1669 /* Keep symbol and string tables for decoding later. */
1670 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1671 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1674 /* Check module struct version now, before we try to use module. */
1675 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1680 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1681 /* This is allowed: modprobe --force will invalidate it. */
1683 add_taint(TAINT_FORCED_MODULE
);
1684 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1686 } else if (!same_magic(modmagic
, vermagic
)) {
1687 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1688 mod
->name
, modmagic
, vermagic
);
1693 /* Now copy in args */
1694 arglen
= strlen_user(uargs
);
1699 args
= kmalloc(arglen
, GFP_KERNEL
);
1704 if (copy_from_user(args
, uargs
, arglen
) != 0) {
1709 /* Userspace could have altered the string after the strlen_user() */
1710 args
[arglen
- 1] = '\0';
1712 if (find_module(mod
->name
)) {
1717 mod
->state
= MODULE_STATE_COMING
;
1719 /* Allow arches to frob section contents and sizes. */
1720 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1725 /* We have a special allocation for this section. */
1726 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1727 sechdrs
[pcpuindex
].sh_addralign
,
1733 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1734 mod
->percpu
= percpu
;
1737 /* Determine total sizes, and put offsets in sh_entsize. For now
1738 this is done generically; there doesn't appear to be any
1739 special cases for the architectures. */
1740 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1742 /* Do the allocs. */
1743 ptr
= module_alloc(mod
->core_size
);
1748 memset(ptr
, 0, mod
->core_size
);
1749 mod
->module_core
= ptr
;
1751 ptr
= module_alloc(mod
->init_size
);
1752 if (!ptr
&& mod
->init_size
) {
1756 memset(ptr
, 0, mod
->init_size
);
1757 mod
->module_init
= ptr
;
1759 /* Transfer each section which specifies SHF_ALLOC */
1760 DEBUGP("final section addresses:\n");
1761 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1764 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1767 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1768 dest
= mod
->module_init
1769 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1771 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1773 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1774 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1775 sechdrs
[i
].sh_size
);
1776 /* Update sh_addr to point to copy in image. */
1777 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1778 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1780 /* Module has been moved. */
1781 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1783 /* Now we've moved module, initialize linked lists, etc. */
1784 module_unload_init(mod
);
1786 /* Set up license info based on the info section */
1787 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1789 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1790 add_taint(TAINT_PROPRIETARY_MODULE
);
1791 if (strcmp(mod
->name
, "driverloader") == 0)
1792 add_taint(TAINT_PROPRIETARY_MODULE
);
1794 /* Set up MODINFO_ATTR fields */
1795 setup_modinfo(mod
, sechdrs
, infoindex
);
1797 /* Fix up syms, so that st_value is a pointer to location. */
1798 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1803 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1804 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1805 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1807 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1808 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1809 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1811 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1812 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1813 sizeof(*mod
->gpl_future_syms
);
1814 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1815 if (gplfuturecrcindex
)
1816 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1818 #ifdef CONFIG_MODVERSIONS
1819 if ((mod
->num_syms
&& !crcindex
) ||
1820 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1821 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
)) {
1822 printk(KERN_WARNING
"%s: No versions for exported symbols."
1823 " Tainting kernel.\n", mod
->name
);
1824 add_taint(TAINT_FORCED_MODULE
);
1828 /* Now do relocations. */
1829 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1830 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1831 unsigned int info
= sechdrs
[i
].sh_info
;
1833 /* Not a valid relocation section? */
1834 if (info
>= hdr
->e_shnum
)
1837 /* Don't bother with non-allocated sections */
1838 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1841 if (sechdrs
[i
].sh_type
== SHT_REL
)
1842 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1843 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1844 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1850 /* Find duplicate symbols */
1851 err
= verify_export_symbols(mod
);
1856 /* Set up and sort exception table */
1857 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1858 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1859 sort_extable(extable
, extable
+ mod
->num_exentries
);
1861 /* Finally, copy percpu area over. */
1862 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1863 sechdrs
[pcpuindex
].sh_size
);
1865 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1867 err
= module_finalize(hdr
, sechdrs
, mod
);
1871 /* flush the icache in correct context */
1876 * Flush the instruction cache, since we've played with text.
1877 * Do it before processing of module parameters, so the module
1878 * can provide parameter accessor functions of its own.
1880 if (mod
->module_init
)
1881 flush_icache_range((unsigned long)mod
->module_init
,
1882 (unsigned long)mod
->module_init
1884 flush_icache_range((unsigned long)mod
->module_core
,
1885 (unsigned long)mod
->module_core
+ mod
->core_size
);
1891 err
= obsolete_params(mod
->name
, mod
->args
,
1892 (struct obsolete_modparm
*)
1893 sechdrs
[obsparmindex
].sh_addr
,
1894 sechdrs
[obsparmindex
].sh_size
1895 / sizeof(struct obsolete_modparm
),
1897 (char *)sechdrs
[strindex
].sh_addr
);
1899 printk(KERN_WARNING
"%s: Ignoring new-style "
1900 "parameters in presence of obsolete ones\n",
1903 /* Size of section 0 is 0, so this works well if no params */
1904 err
= parse_args(mod
->name
, mod
->args
,
1905 (struct kernel_param
*)
1906 sechdrs
[setupindex
].sh_addr
,
1907 sechdrs
[setupindex
].sh_size
1908 / sizeof(struct kernel_param
),
1914 err
= mod_sysfs_setup(mod
,
1915 (struct kernel_param
*)
1916 sechdrs
[setupindex
].sh_addr
,
1917 sechdrs
[setupindex
].sh_size
1918 / sizeof(struct kernel_param
));
1921 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1923 /* Get rid of temporary copy */
1930 module_arch_cleanup(mod
);
1932 module_unload_free(mod
);
1933 module_free(mod
, mod
->module_init
);
1935 module_free(mod
, mod
->module_core
);
1938 percpu_modfree(percpu
);
1943 return ERR_PTR(err
);
1946 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1952 * link the module with the whole machine is stopped with interrupts off
1953 * - this defends against kallsyms not taking locks
1955 static int __link_module(void *_mod
)
1957 struct module
*mod
= _mod
;
1958 list_add(&mod
->list
, &modules
);
1962 /* This is where the real work happens */
1964 sys_init_module(void __user
*umod
,
1966 const char __user
*uargs
)
1971 /* Must have permission */
1972 if (!capable(CAP_SYS_MODULE
))
1975 /* Only one module load at a time, please */
1976 if (mutex_lock_interruptible(&module_mutex
) != 0)
1979 /* Do all the hard work */
1980 mod
= load_module(umod
, len
, uargs
);
1982 mutex_unlock(&module_mutex
);
1983 return PTR_ERR(mod
);
1986 /* Now sew it into the lists. They won't access us, since
1987 strong_try_module_get() will fail. */
1988 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1990 /* Drop lock so they can recurse */
1991 mutex_unlock(&module_mutex
);
1993 mutex_lock(¬ify_mutex
);
1994 notifier_call_chain(&module_notify_list
, MODULE_STATE_COMING
, mod
);
1995 mutex_unlock(¬ify_mutex
);
1997 /* Start the module */
1998 if (mod
->init
!= NULL
)
2001 /* Init routine failed: abort. Try to protect us from
2002 buggy refcounters. */
2003 mod
->state
= MODULE_STATE_GOING
;
2004 synchronize_sched();
2006 printk(KERN_ERR
"%s: module is now stuck!\n",
2010 mutex_lock(&module_mutex
);
2012 mutex_unlock(&module_mutex
);
2017 /* Now it's a first class citizen! */
2018 mutex_lock(&module_mutex
);
2019 mod
->state
= MODULE_STATE_LIVE
;
2020 /* Drop initial reference. */
2022 module_free(mod
, mod
->module_init
);
2023 mod
->module_init
= NULL
;
2025 mod
->init_text_size
= 0;
2026 mutex_unlock(&module_mutex
);
2031 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2033 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2036 #ifdef CONFIG_KALLSYMS
2038 * This ignores the intensely annoying "mapping symbols" found
2039 * in ARM ELF files: $a, $t and $d.
2041 static inline int is_arm_mapping_symbol(const char *str
)
2043 return str
[0] == '$' && strchr("atd", str
[1])
2044 && (str
[2] == '\0' || str
[2] == '.');
2047 static const char *get_ksymbol(struct module
*mod
,
2049 unsigned long *size
,
2050 unsigned long *offset
)
2052 unsigned int i
, best
= 0;
2053 unsigned long nextval
;
2055 /* At worse, next value is at end of module */
2056 if (within(addr
, mod
->module_init
, mod
->init_size
))
2057 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2059 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2061 /* Scan for closest preceeding symbol, and next symbol. (ELF
2062 starts real symbols at 1). */
2063 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2064 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2067 /* We ignore unnamed symbols: they're uninformative
2068 * and inserted at a whim. */
2069 if (mod
->symtab
[i
].st_value
<= addr
2070 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2071 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2072 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2074 if (mod
->symtab
[i
].st_value
> addr
2075 && mod
->symtab
[i
].st_value
< nextval
2076 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2077 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2078 nextval
= mod
->symtab
[i
].st_value
;
2084 *size
= nextval
- mod
->symtab
[best
].st_value
;
2085 *offset
= addr
- mod
->symtab
[best
].st_value
;
2086 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2089 /* For kallsyms to ask for address resolution. NULL means not found.
2090 We don't lock, as this is used for oops resolution and races are a
2092 const char *module_address_lookup(unsigned long addr
,
2093 unsigned long *size
,
2094 unsigned long *offset
,
2099 list_for_each_entry(mod
, &modules
, list
) {
2100 if (within(addr
, mod
->module_init
, mod
->init_size
)
2101 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2102 *modname
= mod
->name
;
2103 return get_ksymbol(mod
, addr
, size
, offset
);
2109 struct module
*module_get_kallsym(unsigned int symnum
,
2110 unsigned long *value
,
2116 mutex_lock(&module_mutex
);
2117 list_for_each_entry(mod
, &modules
, list
) {
2118 if (symnum
< mod
->num_symtab
) {
2119 *value
= mod
->symtab
[symnum
].st_value
;
2120 *type
= mod
->symtab
[symnum
].st_info
;
2122 mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2124 mutex_unlock(&module_mutex
);
2127 symnum
-= mod
->num_symtab
;
2129 mutex_unlock(&module_mutex
);
2133 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2137 for (i
= 0; i
< mod
->num_symtab
; i
++)
2138 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2139 mod
->symtab
[i
].st_info
!= 'U')
2140 return mod
->symtab
[i
].st_value
;
2144 /* Look for this name: can be of form module:name. */
2145 unsigned long module_kallsyms_lookup_name(const char *name
)
2149 unsigned long ret
= 0;
2151 /* Don't lock: we're in enough trouble already. */
2152 if ((colon
= strchr(name
, ':')) != NULL
) {
2154 if ((mod
= find_module(name
)) != NULL
)
2155 ret
= mod_find_symname(mod
, colon
+1);
2158 list_for_each_entry(mod
, &modules
, list
)
2159 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2164 #endif /* CONFIG_KALLSYMS */
2166 /* Called by the /proc file system to return a list of modules. */
2167 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2169 struct list_head
*i
;
2172 mutex_lock(&module_mutex
);
2173 list_for_each(i
, &modules
) {
2182 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2184 struct list_head
*i
= p
;
2186 if (i
->next
== &modules
)
2191 static void m_stop(struct seq_file
*m
, void *p
)
2193 mutex_unlock(&module_mutex
);
2196 static int m_show(struct seq_file
*m
, void *p
)
2198 struct module
*mod
= list_entry(p
, struct module
, list
);
2199 seq_printf(m
, "%s %lu",
2200 mod
->name
, mod
->init_size
+ mod
->core_size
);
2201 print_unload_info(m
, mod
);
2203 /* Informative for users. */
2204 seq_printf(m
, " %s",
2205 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2206 mod
->state
== MODULE_STATE_COMING
? "Loading":
2208 /* Used by oprofile and other similar tools. */
2209 seq_printf(m
, " 0x%p", mod
->module_core
);
2211 seq_printf(m
, "\n");
2215 /* Format: modulename size refcount deps address
2217 Where refcount is a number or -, and deps is a comma-separated list
2220 struct seq_operations modules_op
= {
2227 /* Given an address, look for it in the module exception tables. */
2228 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2230 unsigned long flags
;
2231 const struct exception_table_entry
*e
= NULL
;
2234 spin_lock_irqsave(&modlist_lock
, flags
);
2235 list_for_each_entry(mod
, &modules
, list
) {
2236 if (mod
->num_exentries
== 0)
2239 e
= search_extable(mod
->extable
,
2240 mod
->extable
+ mod
->num_exentries
- 1,
2245 spin_unlock_irqrestore(&modlist_lock
, flags
);
2247 /* Now, if we found one, we are running inside it now, hence
2248 we cannot unload the module, hence no refcnt needed. */
2252 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2253 struct module
*__module_text_address(unsigned long addr
)
2257 list_for_each_entry(mod
, &modules
, list
)
2258 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2259 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2264 struct module
*module_text_address(unsigned long addr
)
2267 unsigned long flags
;
2269 spin_lock_irqsave(&modlist_lock
, flags
);
2270 mod
= __module_text_address(addr
);
2271 spin_unlock_irqrestore(&modlist_lock
, flags
);
2276 /* Don't grab lock, we're oopsing. */
2277 void print_modules(void)
2281 printk("Modules linked in:");
2282 list_for_each_entry(mod
, &modules
, list
)
2283 printk(" %s", mod
->name
);
2287 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2292 /* Don't check return code; this call is idempotent */
2293 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2295 EXPORT_SYMBOL(module_add_driver
);
2297 void module_remove_driver(struct device_driver
*drv
)
2301 sysfs_remove_link(&drv
->kobj
, "module");
2303 EXPORT_SYMBOL(module_remove_driver
);
2305 #ifdef CONFIG_MODVERSIONS
2306 /* Generate the signature for struct module here, too, for modversions. */
2307 void struct_module(struct module
*mod
) { return; }
2308 EXPORT_SYMBOL(struct_module
);