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 <asm/uaccess.h>
43 #include <asm/semaphore.h>
44 #include <asm/cacheflush.h>
49 #define DEBUGP(fmt , a...)
52 #ifndef ARCH_SHF_SMALL
53 #define ARCH_SHF_SMALL 0
56 /* If this is set, the section belongs in the init part of the module */
57 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
59 /* Protects module list */
60 static DEFINE_SPINLOCK(modlist_lock
);
62 /* List of modules, protected by module_mutex AND modlist_lock */
63 static DECLARE_MUTEX(module_mutex
);
64 static LIST_HEAD(modules
);
66 static DECLARE_MUTEX(notify_mutex
);
67 static struct notifier_block
* module_notify_list
;
69 int register_module_notifier(struct notifier_block
* nb
)
73 err
= notifier_chain_register(&module_notify_list
, nb
);
77 EXPORT_SYMBOL(register_module_notifier
);
79 int unregister_module_notifier(struct notifier_block
* nb
)
83 err
= notifier_chain_unregister(&module_notify_list
, nb
);
87 EXPORT_SYMBOL(unregister_module_notifier
);
89 /* We require a truly strong try_module_get() */
90 static inline int strong_try_module_get(struct module
*mod
)
92 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
94 return try_module_get(mod
);
97 /* A thread that wants to hold a reference to a module only while it
98 * is running can call ths to safely exit.
99 * nfsd and lockd use this.
101 void __module_put_and_exit(struct module
*mod
, long code
)
106 EXPORT_SYMBOL(__module_put_and_exit
);
108 /* Find a module section: 0 means not found. */
109 static unsigned int find_sec(Elf_Ehdr
*hdr
,
111 const char *secstrings
,
116 for (i
= 1; i
< hdr
->e_shnum
; i
++)
117 /* Alloc bit cleared means "ignore it." */
118 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
119 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
124 /* Provided by the linker */
125 extern const struct kernel_symbol __start___ksymtab
[];
126 extern const struct kernel_symbol __stop___ksymtab
[];
127 extern const struct kernel_symbol __start___ksymtab_gpl
[];
128 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
129 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
130 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
131 extern const unsigned long __start___kcrctab
[];
132 extern const unsigned long __start___kcrctab_gpl
[];
133 extern const unsigned long __start___kcrctab_gpl_future
[];
135 #ifndef CONFIG_MODVERSIONS
136 #define symversion(base, idx) NULL
138 #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL)
141 /* lookup symbol in given range of kernel_symbols */
142 static const struct kernel_symbol
*lookup_symbol(const char *name
,
143 const struct kernel_symbol
*start
,
144 const struct kernel_symbol
*stop
)
146 const struct kernel_symbol
*ks
= start
;
147 for (; ks
< stop
; ks
++)
148 if (strcmp(ks
->name
, name
) == 0)
153 /* Find a symbol, return value, crc and module which owns it */
154 static unsigned long __find_symbol(const char *name
,
155 struct module
**owner
,
156 const unsigned long **crc
,
160 const struct kernel_symbol
*ks
;
162 /* Core kernel first. */
164 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
166 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
170 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
171 __stop___ksymtab_gpl
);
173 *crc
= symversion(__start___kcrctab_gpl
,
174 (ks
- __start___ksymtab_gpl
));
178 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
179 __stop___ksymtab_gpl_future
);
182 printk(KERN_WARNING
"Symbol %s is being used "
183 "by a non-GPL module, which will not "
184 "be allowed in the future\n", name
);
185 printk(KERN_WARNING
"Please see the file "
186 "Documentation/feature-removal-schedule.txt "
187 "in the kernel source tree for more "
190 *crc
= symversion(__start___kcrctab_gpl_future
,
191 (ks
- __start___ksymtab_gpl_future
));
195 /* Now try modules. */
196 list_for_each_entry(mod
, &modules
, list
) {
198 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
200 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
205 ks
= lookup_symbol(name
, mod
->gpl_syms
,
206 mod
->gpl_syms
+ mod
->num_gpl_syms
);
208 *crc
= symversion(mod
->gpl_crcs
,
209 (ks
- mod
->gpl_syms
));
213 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
214 (mod
->gpl_future_syms
+
215 mod
->num_gpl_future_syms
));
218 printk(KERN_WARNING
"Symbol %s is being used "
219 "by a non-GPL module, which will not "
220 "be allowed in the future\n", name
);
221 printk(KERN_WARNING
"Please see the file "
222 "Documentation/feature-removal-schedule.txt "
223 "in the kernel source tree for more "
226 *crc
= symversion(mod
->gpl_future_crcs
,
227 (ks
- mod
->gpl_future_syms
));
231 DEBUGP("Failed to find symbol %s\n", name
);
235 /* Find a symbol in this elf symbol table */
236 static unsigned long find_local_symbol(Elf_Shdr
*sechdrs
,
237 unsigned int symindex
,
242 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
244 /* Search (defined) internal symbols first. */
245 for (i
= 1; i
< sechdrs
[symindex
].sh_size
/sizeof(*sym
); i
++) {
246 if (sym
[i
].st_shndx
!= SHN_UNDEF
247 && strcmp(name
, strtab
+ sym
[i
].st_name
) == 0)
248 return sym
[i
].st_value
;
253 /* Search for module by name: must hold module_mutex. */
254 static struct module
*find_module(const char *name
)
258 list_for_each_entry(mod
, &modules
, list
) {
259 if (strcmp(mod
->name
, name
) == 0)
266 /* Number of blocks used and allocated. */
267 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
268 /* Size of each block. -ve means used. */
269 static int *pcpu_size
;
271 static int split_block(unsigned int i
, unsigned short size
)
273 /* Reallocation required? */
274 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
275 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
280 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
281 pcpu_num_allocated
*= 2;
286 /* Insert a new subblock */
287 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
288 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
291 pcpu_size
[i
+1] -= size
;
296 static inline unsigned int block_size(int val
)
303 /* Created by linker magic */
304 extern char __per_cpu_start
[], __per_cpu_end
[];
306 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
313 if (align
> SMP_CACHE_BYTES
) {
314 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
315 name
, align
, SMP_CACHE_BYTES
);
316 align
= SMP_CACHE_BYTES
;
319 ptr
= __per_cpu_start
;
320 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
321 /* Extra for alignment requirement. */
322 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
323 BUG_ON(i
== 0 && extra
!= 0);
325 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
328 /* Transfer extra to previous block. */
329 if (pcpu_size
[i
-1] < 0)
330 pcpu_size
[i
-1] -= extra
;
332 pcpu_size
[i
-1] += extra
;
333 pcpu_size
[i
] -= extra
;
336 /* Split block if warranted */
337 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
338 if (!split_block(i
, size
))
342 pcpu_size
[i
] = -pcpu_size
[i
];
346 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
351 static void percpu_modfree(void *freeme
)
354 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
356 /* First entry is core kernel percpu data. */
357 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
359 pcpu_size
[i
] = -pcpu_size
[i
];
366 /* Merge with previous? */
367 if (pcpu_size
[i
-1] >= 0) {
368 pcpu_size
[i
-1] += pcpu_size
[i
];
370 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
371 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
374 /* Merge with next? */
375 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
376 pcpu_size
[i
] += pcpu_size
[i
+1];
378 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
379 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
383 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
385 const char *secstrings
)
387 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
390 static int percpu_modinit(void)
393 pcpu_num_allocated
= 2;
394 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
396 /* Static in-kernel percpu data (used). */
397 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
399 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
400 if (pcpu_size
[1] < 0) {
401 printk(KERN_ERR
"No per-cpu room for modules.\n");
407 __initcall(percpu_modinit
);
408 #else /* ... !CONFIG_SMP */
409 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
414 static inline void percpu_modfree(void *pcpuptr
)
418 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
420 const char *secstrings
)
424 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
427 /* pcpusec should be 0, and size of that section should be 0. */
430 #endif /* CONFIG_SMP */
432 #define MODINFO_ATTR(field) \
433 static void setup_modinfo_##field(struct module *mod, const char *s) \
435 mod->field = kstrdup(s, GFP_KERNEL); \
437 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
438 struct module *mod, char *buffer) \
440 return sprintf(buffer, "%s\n", mod->field); \
442 static int modinfo_##field##_exists(struct module *mod) \
444 return mod->field != NULL; \
446 static void free_modinfo_##field(struct module *mod) \
451 static struct module_attribute modinfo_##field = { \
452 .attr = { .name = __stringify(field), .mode = 0444, \
453 .owner = THIS_MODULE }, \
454 .show = show_modinfo_##field, \
455 .setup = setup_modinfo_##field, \
456 .test = modinfo_##field##_exists, \
457 .free = free_modinfo_##field, \
460 MODINFO_ATTR(version
);
461 MODINFO_ATTR(srcversion
);
463 #ifdef CONFIG_MODULE_UNLOAD
464 /* Init the unload section of the module. */
465 static void module_unload_init(struct module
*mod
)
469 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
470 for (i
= 0; i
< NR_CPUS
; i
++)
471 local_set(&mod
->ref
[i
].count
, 0);
472 /* Hold reference count during initialization. */
473 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
474 /* Backwards compatibility macros put refcount during init. */
475 mod
->waiter
= current
;
478 /* modules using other modules */
481 struct list_head list
;
482 struct module
*module_which_uses
;
485 /* Does a already use b? */
486 static int already_uses(struct module
*a
, struct module
*b
)
488 struct module_use
*use
;
490 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
491 if (use
->module_which_uses
== a
) {
492 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
496 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
500 /* Module a uses b */
501 static int use_module(struct module
*a
, struct module
*b
)
503 struct module_use
*use
;
504 if (b
== NULL
|| already_uses(a
, b
)) return 1;
506 if (!strong_try_module_get(b
))
509 DEBUGP("Allocating new usage for %s.\n", a
->name
);
510 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
512 printk("%s: out of memory loading\n", a
->name
);
517 use
->module_which_uses
= a
;
518 list_add(&use
->list
, &b
->modules_which_use_me
);
522 /* Clear the unload stuff of the module. */
523 static void module_unload_free(struct module
*mod
)
527 list_for_each_entry(i
, &modules
, list
) {
528 struct module_use
*use
;
530 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
531 if (use
->module_which_uses
== mod
) {
532 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
534 list_del(&use
->list
);
536 /* There can be at most one match. */
543 #ifdef CONFIG_MODULE_FORCE_UNLOAD
544 static inline int try_force_unload(unsigned int flags
)
546 int ret
= (flags
& O_TRUNC
);
548 add_taint(TAINT_FORCED_RMMOD
);
552 static inline int try_force_unload(unsigned int flags
)
556 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
565 /* Whole machine is stopped with interrupts off when this runs. */
566 static int __try_stop_module(void *_sref
)
568 struct stopref
*sref
= _sref
;
570 /* If it's not unused, quit unless we are told to block. */
571 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
572 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
576 /* Mark it as dying. */
577 sref
->mod
->state
= MODULE_STATE_GOING
;
581 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
583 struct stopref sref
= { mod
, flags
, forced
};
585 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
588 unsigned int module_refcount(struct module
*mod
)
590 unsigned int i
, total
= 0;
592 for (i
= 0; i
< NR_CPUS
; i
++)
593 total
+= local_read(&mod
->ref
[i
].count
);
596 EXPORT_SYMBOL(module_refcount
);
598 /* This exists whether we can unload or not */
599 static void free_module(struct module
*mod
);
601 static void wait_for_zero_refcount(struct module
*mod
)
603 /* Since we might sleep for some time, drop the semaphore first */
606 DEBUGP("Looking at refcount...\n");
607 set_current_state(TASK_UNINTERRUPTIBLE
);
608 if (module_refcount(mod
) == 0)
612 current
->state
= TASK_RUNNING
;
617 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
620 char name
[MODULE_NAME_LEN
];
623 if (!capable(CAP_SYS_MODULE
))
626 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
628 name
[MODULE_NAME_LEN
-1] = '\0';
630 if (down_interruptible(&module_mutex
) != 0)
633 mod
= find_module(name
);
639 if (!list_empty(&mod
->modules_which_use_me
)) {
640 /* Other modules depend on us: get rid of them first. */
645 /* Doing init or already dying? */
646 if (mod
->state
!= MODULE_STATE_LIVE
) {
647 /* FIXME: if (force), slam module count and wake up
649 DEBUGP("%s already dying\n", mod
->name
);
654 /* If it has an init func, it must have an exit func to unload */
655 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
657 forced
= try_force_unload(flags
);
659 /* This module can't be removed */
665 /* Set this up before setting mod->state */
666 mod
->waiter
= current
;
668 /* Stop the machine so refcounts can't move and disable module. */
669 ret
= try_stop_module(mod
, flags
, &forced
);
673 /* Never wait if forced. */
674 if (!forced
&& module_refcount(mod
) != 0)
675 wait_for_zero_refcount(mod
);
677 /* Final destruction now noone is using it. */
678 if (mod
->exit
!= NULL
) {
690 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
692 struct module_use
*use
;
693 int printed_something
= 0;
695 seq_printf(m
, " %u ", module_refcount(mod
));
697 /* Always include a trailing , so userspace can differentiate
698 between this and the old multi-field proc format. */
699 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
700 printed_something
= 1;
701 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
705 printed_something
= 1;
706 seq_printf(m
, "[unsafe],");
709 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
710 printed_something
= 1;
711 seq_printf(m
, "[permanent],");
714 if (!printed_something
)
718 void __symbol_put(const char *symbol
)
720 struct module
*owner
;
722 const unsigned long *crc
;
724 spin_lock_irqsave(&modlist_lock
, flags
);
725 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
728 spin_unlock_irqrestore(&modlist_lock
, flags
);
730 EXPORT_SYMBOL(__symbol_put
);
732 void symbol_put_addr(void *addr
)
736 spin_lock_irqsave(&modlist_lock
, flags
);
737 if (!kernel_text_address((unsigned long)addr
))
740 module_put(module_text_address((unsigned long)addr
));
741 spin_unlock_irqrestore(&modlist_lock
, flags
);
743 EXPORT_SYMBOL_GPL(symbol_put_addr
);
745 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
746 struct module
*mod
, char *buffer
)
748 /* sysfs holds a reference */
749 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
752 static struct module_attribute refcnt
= {
753 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
757 #else /* !CONFIG_MODULE_UNLOAD */
758 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
760 /* We don't know the usage count, or what modules are using. */
761 seq_printf(m
, " - -");
764 static inline void module_unload_free(struct module
*mod
)
768 static inline int use_module(struct module
*a
, struct module
*b
)
770 return strong_try_module_get(b
);
773 static inline void module_unload_init(struct module
*mod
)
776 #endif /* CONFIG_MODULE_UNLOAD */
778 static struct module_attribute
*modinfo_attrs
[] = {
781 #ifdef CONFIG_MODULE_UNLOAD
787 #ifdef CONFIG_OBSOLETE_MODPARM
788 /* Bounds checking done below */
789 static int obsparm_copy_string(const char *val
, struct kernel_param
*kp
)
791 strcpy(kp
->arg
, val
);
795 static int set_obsolete(const char *val
, struct kernel_param
*kp
)
797 unsigned int min
, max
;
798 unsigned int size
, maxsize
;
802 struct obsolete_modparm
*obsparm
= kp
->arg
;
805 printk(KERN_ERR
"Parameter %s needs an argument\n", kp
->name
);
809 /* type is: [min[-max]]{b,h,i,l,s} */
811 min
= simple_strtol(p
, &endp
, 10);
812 if (endp
== obsparm
->type
)
814 else if (*endp
== '-') {
816 max
= simple_strtol(p
, &endp
, 10);
821 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
822 1, param_set_byte
, &dummy
);
824 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
825 sizeof(short), param_set_short
, &dummy
);
827 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
828 sizeof(int), param_set_int
, &dummy
);
830 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
831 sizeof(long), param_set_long
, &dummy
);
833 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
834 sizeof(char *), param_set_charp
, &dummy
);
837 /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars,
838 and the decl is "char xxx[5][50];" */
840 maxsize
= simple_strtol(p
, &endp
, 10);
841 /* We check lengths here (yes, this is a hack). */
843 while (p
[size
= strcspn(p
, ",")]) {
850 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
851 maxsize
, obsparm_copy_string
, &dummy
);
853 printk(KERN_ERR
"Unknown obsolete parameter type %s\n", obsparm
->type
);
857 "Parameter %s doesn't fit in %u chars.\n", kp
->name
, maxsize
);
861 static int obsolete_params(const char *name
,
863 struct obsolete_modparm obsparm
[],
866 unsigned int symindex
,
869 struct kernel_param
*kp
;
873 kp
= kmalloc(sizeof(kp
[0]) * num
, GFP_KERNEL
);
877 for (i
= 0; i
< num
; i
++) {
878 char sym_name
[128 + sizeof(MODULE_SYMBOL_PREFIX
)];
880 snprintf(sym_name
, sizeof(sym_name
), "%s%s",
881 MODULE_SYMBOL_PREFIX
, obsparm
[i
].name
);
883 kp
[i
].name
= obsparm
[i
].name
;
885 kp
[i
].set
= set_obsolete
;
888 = (void *)find_local_symbol(sechdrs
, symindex
, strtab
,
890 if (!obsparm
[i
].addr
) {
891 printk("%s: falsely claims to have parameter %s\n",
892 name
, obsparm
[i
].name
);
896 kp
[i
].arg
= &obsparm
[i
];
899 ret
= parse_args(name
, args
, kp
, num
, NULL
);
905 static int obsolete_params(const char *name
,
907 struct obsolete_modparm obsparm
[],
910 unsigned int symindex
,
914 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
918 #endif /* CONFIG_OBSOLETE_MODPARM */
920 static const char vermagic
[] = VERMAGIC_STRING
;
922 #ifdef CONFIG_MODVERSIONS
923 static int check_version(Elf_Shdr
*sechdrs
,
924 unsigned int versindex
,
927 const unsigned long *crc
)
929 unsigned int i
, num_versions
;
930 struct modversion_info
*versions
;
932 /* Exporting module didn't supply crcs? OK, we're already tainted. */
936 versions
= (void *) sechdrs
[versindex
].sh_addr
;
937 num_versions
= sechdrs
[versindex
].sh_size
938 / sizeof(struct modversion_info
);
940 for (i
= 0; i
< num_versions
; i
++) {
941 if (strcmp(versions
[i
].name
, symname
) != 0)
944 if (versions
[i
].crc
== *crc
)
946 printk("%s: disagrees about version of symbol %s\n",
948 DEBUGP("Found checksum %lX vs module %lX\n",
949 *crc
, versions
[i
].crc
);
952 /* Not in module's version table. OK, but that taints the kernel. */
953 if (!(tainted
& TAINT_FORCED_MODULE
)) {
954 printk("%s: no version for \"%s\" found: kernel tainted.\n",
956 add_taint(TAINT_FORCED_MODULE
);
961 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
962 unsigned int versindex
,
965 const unsigned long *crc
;
966 struct module
*owner
;
968 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
970 return check_version(sechdrs
, versindex
, "struct_module", mod
,
974 /* First part is kernel version, which we ignore. */
975 static inline int same_magic(const char *amagic
, const char *bmagic
)
977 amagic
+= strcspn(amagic
, " ");
978 bmagic
+= strcspn(bmagic
, " ");
979 return strcmp(amagic
, bmagic
) == 0;
982 static inline int check_version(Elf_Shdr
*sechdrs
,
983 unsigned int versindex
,
986 const unsigned long *crc
)
991 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
992 unsigned int versindex
,
998 static inline int same_magic(const char *amagic
, const char *bmagic
)
1000 return strcmp(amagic
, bmagic
) == 0;
1002 #endif /* CONFIG_MODVERSIONS */
1004 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1005 Must be holding module_mutex. */
1006 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
1007 unsigned int versindex
,
1011 struct module
*owner
;
1013 const unsigned long *crc
;
1015 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
1017 /* use_module can fail due to OOM, or module unloading */
1018 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
1019 !use_module(mod
, owner
))
1027 * /sys/module/foo/sections stuff
1028 * J. Corbet <corbet@lwn.net>
1030 #ifdef CONFIG_KALLSYMS
1031 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1032 struct module
*mod
, char *buf
)
1034 struct module_sect_attr
*sattr
=
1035 container_of(mattr
, struct module_sect_attr
, mattr
);
1036 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1039 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1040 char *secstrings
, Elf_Shdr
*sechdrs
)
1042 unsigned int nloaded
= 0, i
, size
[2];
1043 struct module_sect_attrs
*sect_attrs
;
1044 struct module_sect_attr
*sattr
;
1045 struct attribute
**gattr
;
1047 /* Count loaded sections and allocate structures */
1048 for (i
= 0; i
< nsect
; i
++)
1049 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1051 size
[0] = ALIGN(sizeof(*sect_attrs
)
1052 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1053 sizeof(sect_attrs
->grp
.attrs
[0]));
1054 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1055 if (! (sect_attrs
= kmalloc(size
[0] + size
[1], GFP_KERNEL
)))
1058 /* Setup section attributes. */
1059 sect_attrs
->grp
.name
= "sections";
1060 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1062 sattr
= §_attrs
->attrs
[0];
1063 gattr
= §_attrs
->grp
.attrs
[0];
1064 for (i
= 0; i
< nsect
; i
++) {
1065 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1067 sattr
->address
= sechdrs
[i
].sh_addr
;
1068 strlcpy(sattr
->name
, secstrings
+ sechdrs
[i
].sh_name
,
1069 MODULE_SECT_NAME_LEN
);
1070 sattr
->mattr
.show
= module_sect_show
;
1071 sattr
->mattr
.store
= NULL
;
1072 sattr
->mattr
.attr
.name
= sattr
->name
;
1073 sattr
->mattr
.attr
.owner
= mod
;
1074 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1075 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1079 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1082 mod
->sect_attrs
= sect_attrs
;
1088 static void remove_sect_attrs(struct module
*mod
)
1090 if (mod
->sect_attrs
) {
1091 sysfs_remove_group(&mod
->mkobj
.kobj
,
1092 &mod
->sect_attrs
->grp
);
1093 /* We are positive that no one is using any sect attrs
1094 * at this point. Deallocate immediately. */
1095 kfree(mod
->sect_attrs
);
1096 mod
->sect_attrs
= NULL
;
1102 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1103 char *sectstrings
, Elf_Shdr
*sechdrs
)
1107 static inline void remove_sect_attrs(struct module
*mod
)
1110 #endif /* CONFIG_KALLSYMS */
1112 static int module_add_modinfo_attrs(struct module
*mod
)
1114 struct module_attribute
*attr
;
1115 struct module_attribute
*temp_attr
;
1119 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1120 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1122 if (!mod
->modinfo_attrs
)
1125 temp_attr
= mod
->modinfo_attrs
;
1126 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1128 (attr
->test
&& attr
->test(mod
))) {
1129 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1130 temp_attr
->attr
.owner
= mod
;
1131 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1138 static void module_remove_modinfo_attrs(struct module
*mod
)
1140 struct module_attribute
*attr
;
1143 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1144 /* pick a field to test for end of list */
1145 if (!attr
->attr
.name
)
1147 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1151 kfree(mod
->modinfo_attrs
);
1154 static int mod_sysfs_setup(struct module
*mod
,
1155 struct kernel_param
*kparam
,
1156 unsigned int num_params
)
1160 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1161 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1164 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1165 mod
->mkobj
.mod
= mod
;
1166 err
= kobject_register(&mod
->mkobj
.kobj
);
1170 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1174 err
= module_add_modinfo_attrs(mod
);
1181 kobject_unregister(&mod
->mkobj
.kobj
);
1186 static void mod_kobject_remove(struct module
*mod
)
1188 module_remove_modinfo_attrs(mod
);
1189 module_param_sysfs_remove(mod
);
1191 kobject_unregister(&mod
->mkobj
.kobj
);
1195 * unlink the module with the whole machine is stopped with interrupts off
1196 * - this defends against kallsyms not taking locks
1198 static int __unlink_module(void *_mod
)
1200 struct module
*mod
= _mod
;
1201 list_del(&mod
->list
);
1205 /* Free a module, remove from lists, etc (must hold module mutex). */
1206 static void free_module(struct module
*mod
)
1208 /* Delete from various lists */
1209 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1210 remove_sect_attrs(mod
);
1211 mod_kobject_remove(mod
);
1213 /* Arch-specific cleanup. */
1214 module_arch_cleanup(mod
);
1216 /* Module unload stuff */
1217 module_unload_free(mod
);
1219 /* This may be NULL, but that's OK */
1220 module_free(mod
, mod
->module_init
);
1223 percpu_modfree(mod
->percpu
);
1225 /* Finally, free the core (containing the module structure) */
1226 module_free(mod
, mod
->module_core
);
1229 void *__symbol_get(const char *symbol
)
1231 struct module
*owner
;
1232 unsigned long value
, flags
;
1233 const unsigned long *crc
;
1235 spin_lock_irqsave(&modlist_lock
, flags
);
1236 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1237 if (value
&& !strong_try_module_get(owner
))
1239 spin_unlock_irqrestore(&modlist_lock
, flags
);
1241 return (void *)value
;
1243 EXPORT_SYMBOL_GPL(__symbol_get
);
1246 * Ensure that an exported symbol [global namespace] does not already exist
1247 * in the Kernel or in some other modules exported symbol table.
1249 static int verify_export_symbols(struct module
*mod
)
1251 const char *name
= NULL
;
1252 unsigned long i
, ret
= 0;
1253 struct module
*owner
;
1254 const unsigned long *crc
;
1256 for (i
= 0; i
< mod
->num_syms
; i
++)
1257 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1258 name
= mod
->syms
[i
].name
;
1263 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1264 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1265 name
= mod
->gpl_syms
[i
].name
;
1272 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1273 mod
->name
, name
, module_name(owner
));
1278 /* Change all symbols so that sh_value encodes the pointer directly. */
1279 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1280 unsigned int symindex
,
1282 unsigned int versindex
,
1283 unsigned int pcpuindex
,
1286 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1287 unsigned long secbase
;
1288 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1291 for (i
= 1; i
< n
; i
++) {
1292 switch (sym
[i
].st_shndx
) {
1294 /* We compiled with -fno-common. These are not
1295 supposed to happen. */
1296 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1297 printk("%s: please compile with -fno-common\n",
1303 /* Don't need to do anything */
1304 DEBUGP("Absolute symbol: 0x%08lx\n",
1305 (long)sym
[i
].st_value
);
1310 = resolve_symbol(sechdrs
, versindex
,
1311 strtab
+ sym
[i
].st_name
, mod
);
1313 /* Ok if resolved. */
1314 if (sym
[i
].st_value
!= 0)
1317 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1320 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1321 mod
->name
, strtab
+ sym
[i
].st_name
);
1326 /* Divert to percpu allocation if a percpu var. */
1327 if (sym
[i
].st_shndx
== pcpuindex
)
1328 secbase
= (unsigned long)mod
->percpu
;
1330 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1331 sym
[i
].st_value
+= secbase
;
1339 /* Update size with this section: return offset. */
1340 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1344 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1345 *size
= ret
+ sechdr
->sh_size
;
1349 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1350 might -- code, read-only data, read-write data, small data. Tally
1351 sizes, and place the offsets into sh_entsize fields: high bit means it
1353 static void layout_sections(struct module
*mod
,
1354 const Elf_Ehdr
*hdr
,
1356 const char *secstrings
)
1358 static unsigned long const masks
[][2] = {
1359 /* NOTE: all executable code must be the first section
1360 * in this array; otherwise modify the text_size
1361 * finder in the two loops below */
1362 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1363 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1364 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1365 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1369 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1370 sechdrs
[i
].sh_entsize
= ~0UL;
1372 DEBUGP("Core section allocation order:\n");
1373 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1374 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1375 Elf_Shdr
*s
= &sechdrs
[i
];
1377 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1378 || (s
->sh_flags
& masks
[m
][1])
1379 || s
->sh_entsize
!= ~0UL
1380 || strncmp(secstrings
+ s
->sh_name
,
1383 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1384 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1387 mod
->core_text_size
= mod
->core_size
;
1390 DEBUGP("Init section allocation order:\n");
1391 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1392 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1393 Elf_Shdr
*s
= &sechdrs
[i
];
1395 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1396 || (s
->sh_flags
& masks
[m
][1])
1397 || s
->sh_entsize
!= ~0UL
1398 || strncmp(secstrings
+ s
->sh_name
,
1401 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1402 | INIT_OFFSET_MASK
);
1403 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1406 mod
->init_text_size
= mod
->init_size
;
1410 static inline int license_is_gpl_compatible(const char *license
)
1412 return (strcmp(license
, "GPL") == 0
1413 || strcmp(license
, "GPL v2") == 0
1414 || strcmp(license
, "GPL and additional rights") == 0
1415 || strcmp(license
, "Dual BSD/GPL") == 0
1416 || strcmp(license
, "Dual MPL/GPL") == 0);
1419 static void set_license(struct module
*mod
, const char *license
)
1422 license
= "unspecified";
1424 mod
->license_gplok
= license_is_gpl_compatible(license
);
1425 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1426 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1427 mod
->name
, license
);
1428 add_taint(TAINT_PROPRIETARY_MODULE
);
1432 /* Parse tag=value strings from .modinfo section */
1433 static char *next_string(char *string
, unsigned long *secsize
)
1435 /* Skip non-zero chars */
1438 if ((*secsize
)-- <= 1)
1442 /* Skip any zero padding. */
1443 while (!string
[0]) {
1445 if ((*secsize
)-- <= 1)
1451 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1456 unsigned int taglen
= strlen(tag
);
1457 unsigned long size
= sechdrs
[info
].sh_size
;
1459 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1460 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1461 return p
+ taglen
+ 1;
1466 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1467 unsigned int infoindex
)
1469 struct module_attribute
*attr
;
1472 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1475 get_modinfo(sechdrs
,
1481 #ifdef CONFIG_KALLSYMS
1482 int is_exported(const char *name
, const struct module
*mod
)
1484 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1487 if (lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1494 static char elf_type(const Elf_Sym
*sym
,
1496 const char *secstrings
,
1499 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1500 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1505 if (sym
->st_shndx
== SHN_UNDEF
)
1507 if (sym
->st_shndx
== SHN_ABS
)
1509 if (sym
->st_shndx
>= SHN_LORESERVE
)
1511 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1513 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1514 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1515 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1517 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1522 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1523 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1528 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1529 ".debug", strlen(".debug")) == 0)
1534 static void add_kallsyms(struct module
*mod
,
1536 unsigned int symindex
,
1537 unsigned int strindex
,
1538 const char *secstrings
)
1542 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1543 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1544 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1546 /* Set types up while we still have access to sections. */
1547 for (i
= 0; i
< mod
->num_symtab
; i
++)
1548 mod
->symtab
[i
].st_info
1549 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1552 static inline void add_kallsyms(struct module
*mod
,
1554 unsigned int symindex
,
1555 unsigned int strindex
,
1556 const char *secstrings
)
1559 #endif /* CONFIG_KALLSYMS */
1561 /* Allocate and load the module: note that size of section 0 is always
1562 zero, and we rely on this for optional sections. */
1563 static struct module
*load_module(void __user
*umod
,
1565 const char __user
*uargs
)
1569 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1570 unsigned int i
, symindex
= 0, strindex
= 0, setupindex
, exindex
,
1571 exportindex
, modindex
, obsparmindex
, infoindex
, gplindex
,
1572 crcindex
, gplcrcindex
, versindex
, pcpuindex
, gplfutureindex
,
1577 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1578 struct exception_table_entry
*extable
;
1579 mm_segment_t old_fs
;
1581 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1583 if (len
< sizeof(*hdr
))
1584 return ERR_PTR(-ENOEXEC
);
1586 /* Suck in entire file: we'll want most of it. */
1587 /* vmalloc barfs on "unusual" numbers. Check here */
1588 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1589 return ERR_PTR(-ENOMEM
);
1590 if (copy_from_user(hdr
, umod
, len
) != 0) {
1595 /* Sanity checks against insmoding binaries or wrong arch,
1596 weird elf version */
1597 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1598 || hdr
->e_type
!= ET_REL
1599 || !elf_check_arch(hdr
)
1600 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1605 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1608 /* Convenience variables */
1609 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1610 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1611 sechdrs
[0].sh_addr
= 0;
1613 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1614 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1615 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1618 /* Mark all sections sh_addr with their address in the
1620 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1622 /* Internal symbols and strings. */
1623 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1625 strindex
= sechdrs
[i
].sh_link
;
1626 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1628 #ifndef CONFIG_MODULE_UNLOAD
1629 /* Don't load .exit sections */
1630 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1631 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1635 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1636 ".gnu.linkonce.this_module");
1638 printk(KERN_WARNING
"No module found in object\n");
1642 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1644 if (symindex
== 0) {
1645 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1651 /* Optional sections */
1652 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1653 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1654 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1655 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1656 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1657 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1658 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1659 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1660 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1661 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1662 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1663 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1665 /* Don't keep modinfo section */
1666 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1667 #ifdef CONFIG_KALLSYMS
1668 /* Keep symbol and string tables for decoding later. */
1669 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1670 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1673 /* Check module struct version now, before we try to use module. */
1674 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1679 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1680 /* This is allowed: modprobe --force will invalidate it. */
1682 add_taint(TAINT_FORCED_MODULE
);
1683 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1685 } else if (!same_magic(modmagic
, vermagic
)) {
1686 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1687 mod
->name
, modmagic
, vermagic
);
1692 /* Now copy in args */
1693 arglen
= strlen_user(uargs
);
1698 args
= kmalloc(arglen
, GFP_KERNEL
);
1703 if (copy_from_user(args
, uargs
, arglen
) != 0) {
1708 /* Userspace could have altered the string after the strlen_user() */
1709 args
[arglen
- 1] = '\0';
1711 if (find_module(mod
->name
)) {
1716 mod
->state
= MODULE_STATE_COMING
;
1718 /* Allow arches to frob section contents and sizes. */
1719 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1724 /* We have a special allocation for this section. */
1725 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1726 sechdrs
[pcpuindex
].sh_addralign
,
1732 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1733 mod
->percpu
= percpu
;
1736 /* Determine total sizes, and put offsets in sh_entsize. For now
1737 this is done generically; there doesn't appear to be any
1738 special cases for the architectures. */
1739 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1741 /* Do the allocs. */
1742 ptr
= module_alloc(mod
->core_size
);
1747 memset(ptr
, 0, mod
->core_size
);
1748 mod
->module_core
= ptr
;
1750 ptr
= module_alloc(mod
->init_size
);
1751 if (!ptr
&& mod
->init_size
) {
1755 memset(ptr
, 0, mod
->init_size
);
1756 mod
->module_init
= ptr
;
1758 /* Transfer each section which specifies SHF_ALLOC */
1759 DEBUGP("final section addresses:\n");
1760 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1763 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1766 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1767 dest
= mod
->module_init
1768 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1770 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1772 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1773 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1774 sechdrs
[i
].sh_size
);
1775 /* Update sh_addr to point to copy in image. */
1776 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1777 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1779 /* Module has been moved. */
1780 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1782 /* Now we've moved module, initialize linked lists, etc. */
1783 module_unload_init(mod
);
1785 /* Set up license info based on the info section */
1786 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1788 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1789 add_taint(TAINT_PROPRIETARY_MODULE
);
1790 if (strcmp(mod
->name
, "driverloader") == 0)
1791 add_taint(TAINT_PROPRIETARY_MODULE
);
1793 /* Set up MODINFO_ATTR fields */
1794 setup_modinfo(mod
, sechdrs
, infoindex
);
1796 /* Fix up syms, so that st_value is a pointer to location. */
1797 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1802 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1803 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1804 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1806 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1807 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1808 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1810 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1811 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1812 sizeof(*mod
->gpl_future_syms
);
1813 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1814 if (gplfuturecrcindex
)
1815 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1817 #ifdef CONFIG_MODVERSIONS
1818 if ((mod
->num_syms
&& !crcindex
) ||
1819 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1820 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
)) {
1821 printk(KERN_WARNING
"%s: No versions for exported symbols."
1822 " Tainting kernel.\n", mod
->name
);
1823 add_taint(TAINT_FORCED_MODULE
);
1827 /* Now do relocations. */
1828 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1829 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1830 unsigned int info
= sechdrs
[i
].sh_info
;
1832 /* Not a valid relocation section? */
1833 if (info
>= hdr
->e_shnum
)
1836 /* Don't bother with non-allocated sections */
1837 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1840 if (sechdrs
[i
].sh_type
== SHT_REL
)
1841 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1842 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1843 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1849 /* Find duplicate symbols */
1850 err
= verify_export_symbols(mod
);
1855 /* Set up and sort exception table */
1856 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1857 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1858 sort_extable(extable
, extable
+ mod
->num_exentries
);
1860 /* Finally, copy percpu area over. */
1861 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1862 sechdrs
[pcpuindex
].sh_size
);
1864 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1866 err
= module_finalize(hdr
, sechdrs
, mod
);
1870 /* flush the icache in correct context */
1875 * Flush the instruction cache, since we've played with text.
1876 * Do it before processing of module parameters, so the module
1877 * can provide parameter accessor functions of its own.
1879 if (mod
->module_init
)
1880 flush_icache_range((unsigned long)mod
->module_init
,
1881 (unsigned long)mod
->module_init
1883 flush_icache_range((unsigned long)mod
->module_core
,
1884 (unsigned long)mod
->module_core
+ mod
->core_size
);
1890 err
= obsolete_params(mod
->name
, mod
->args
,
1891 (struct obsolete_modparm
*)
1892 sechdrs
[obsparmindex
].sh_addr
,
1893 sechdrs
[obsparmindex
].sh_size
1894 / sizeof(struct obsolete_modparm
),
1896 (char *)sechdrs
[strindex
].sh_addr
);
1898 printk(KERN_WARNING
"%s: Ignoring new-style "
1899 "parameters in presence of obsolete ones\n",
1902 /* Size of section 0 is 0, so this works well if no params */
1903 err
= parse_args(mod
->name
, mod
->args
,
1904 (struct kernel_param
*)
1905 sechdrs
[setupindex
].sh_addr
,
1906 sechdrs
[setupindex
].sh_size
1907 / sizeof(struct kernel_param
),
1913 err
= mod_sysfs_setup(mod
,
1914 (struct kernel_param
*)
1915 sechdrs
[setupindex
].sh_addr
,
1916 sechdrs
[setupindex
].sh_size
1917 / sizeof(struct kernel_param
));
1920 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1922 /* Get rid of temporary copy */
1929 module_arch_cleanup(mod
);
1931 module_unload_free(mod
);
1932 module_free(mod
, mod
->module_init
);
1934 module_free(mod
, mod
->module_core
);
1937 percpu_modfree(percpu
);
1942 return ERR_PTR(err
);
1945 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1951 * link the module with the whole machine is stopped with interrupts off
1952 * - this defends against kallsyms not taking locks
1954 static int __link_module(void *_mod
)
1956 struct module
*mod
= _mod
;
1957 list_add(&mod
->list
, &modules
);
1961 /* This is where the real work happens */
1963 sys_init_module(void __user
*umod
,
1965 const char __user
*uargs
)
1970 /* Must have permission */
1971 if (!capable(CAP_SYS_MODULE
))
1974 /* Only one module load at a time, please */
1975 if (down_interruptible(&module_mutex
) != 0)
1978 /* Do all the hard work */
1979 mod
= load_module(umod
, len
, uargs
);
1982 return PTR_ERR(mod
);
1985 /* Now sew it into the lists. They won't access us, since
1986 strong_try_module_get() will fail. */
1987 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1989 /* Drop lock so they can recurse */
1992 down(¬ify_mutex
);
1993 notifier_call_chain(&module_notify_list
, MODULE_STATE_COMING
, mod
);
1996 /* Start the module */
1997 if (mod
->init
!= NULL
)
2000 /* Init routine failed: abort. Try to protect us from
2001 buggy refcounters. */
2002 mod
->state
= MODULE_STATE_GOING
;
2003 synchronize_sched();
2005 printk(KERN_ERR
"%s: module is now stuck!\n",
2009 down(&module_mutex
);
2016 /* Now it's a first class citizen! */
2017 down(&module_mutex
);
2018 mod
->state
= MODULE_STATE_LIVE
;
2019 /* Drop initial reference. */
2021 module_free(mod
, mod
->module_init
);
2022 mod
->module_init
= NULL
;
2024 mod
->init_text_size
= 0;
2030 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2032 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2035 #ifdef CONFIG_KALLSYMS
2037 * This ignores the intensely annoying "mapping symbols" found
2038 * in ARM ELF files: $a, $t and $d.
2040 static inline int is_arm_mapping_symbol(const char *str
)
2042 return str
[0] == '$' && strchr("atd", str
[1])
2043 && (str
[2] == '\0' || str
[2] == '.');
2046 static const char *get_ksymbol(struct module
*mod
,
2048 unsigned long *size
,
2049 unsigned long *offset
)
2051 unsigned int i
, best
= 0;
2052 unsigned long nextval
;
2054 /* At worse, next value is at end of module */
2055 if (within(addr
, mod
->module_init
, mod
->init_size
))
2056 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2058 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2060 /* Scan for closest preceeding symbol, and next symbol. (ELF
2061 starts real symbols at 1). */
2062 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2063 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2066 /* We ignore unnamed symbols: they're uninformative
2067 * and inserted at a whim. */
2068 if (mod
->symtab
[i
].st_value
<= addr
2069 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2070 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2071 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2073 if (mod
->symtab
[i
].st_value
> addr
2074 && mod
->symtab
[i
].st_value
< nextval
2075 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2076 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2077 nextval
= mod
->symtab
[i
].st_value
;
2083 *size
= nextval
- mod
->symtab
[best
].st_value
;
2084 *offset
= addr
- mod
->symtab
[best
].st_value
;
2085 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2088 /* For kallsyms to ask for address resolution. NULL means not found.
2089 We don't lock, as this is used for oops resolution and races are a
2091 const char *module_address_lookup(unsigned long addr
,
2092 unsigned long *size
,
2093 unsigned long *offset
,
2098 list_for_each_entry(mod
, &modules
, list
) {
2099 if (within(addr
, mod
->module_init
, mod
->init_size
)
2100 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2101 *modname
= mod
->name
;
2102 return get_ksymbol(mod
, addr
, size
, offset
);
2108 struct module
*module_get_kallsym(unsigned int symnum
,
2109 unsigned long *value
,
2115 down(&module_mutex
);
2116 list_for_each_entry(mod
, &modules
, list
) {
2117 if (symnum
< mod
->num_symtab
) {
2118 *value
= mod
->symtab
[symnum
].st_value
;
2119 *type
= mod
->symtab
[symnum
].st_info
;
2121 mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2126 symnum
-= mod
->num_symtab
;
2132 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2136 for (i
= 0; i
< mod
->num_symtab
; i
++)
2137 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2138 mod
->symtab
[i
].st_info
!= 'U')
2139 return mod
->symtab
[i
].st_value
;
2143 /* Look for this name: can be of form module:name. */
2144 unsigned long module_kallsyms_lookup_name(const char *name
)
2148 unsigned long ret
= 0;
2150 /* Don't lock: we're in enough trouble already. */
2151 if ((colon
= strchr(name
, ':')) != NULL
) {
2153 if ((mod
= find_module(name
)) != NULL
)
2154 ret
= mod_find_symname(mod
, colon
+1);
2157 list_for_each_entry(mod
, &modules
, list
)
2158 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2163 #endif /* CONFIG_KALLSYMS */
2165 /* Called by the /proc file system to return a list of modules. */
2166 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2168 struct list_head
*i
;
2171 down(&module_mutex
);
2172 list_for_each(i
, &modules
) {
2181 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2183 struct list_head
*i
= p
;
2185 if (i
->next
== &modules
)
2190 static void m_stop(struct seq_file
*m
, void *p
)
2195 static int m_show(struct seq_file
*m
, void *p
)
2197 struct module
*mod
= list_entry(p
, struct module
, list
);
2198 seq_printf(m
, "%s %lu",
2199 mod
->name
, mod
->init_size
+ mod
->core_size
);
2200 print_unload_info(m
, mod
);
2202 /* Informative for users. */
2203 seq_printf(m
, " %s",
2204 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2205 mod
->state
== MODULE_STATE_COMING
? "Loading":
2207 /* Used by oprofile and other similar tools. */
2208 seq_printf(m
, " 0x%p", mod
->module_core
);
2210 seq_printf(m
, "\n");
2214 /* Format: modulename size refcount deps address
2216 Where refcount is a number or -, and deps is a comma-separated list
2219 struct seq_operations modules_op
= {
2226 /* Given an address, look for it in the module exception tables. */
2227 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2229 unsigned long flags
;
2230 const struct exception_table_entry
*e
= NULL
;
2233 spin_lock_irqsave(&modlist_lock
, flags
);
2234 list_for_each_entry(mod
, &modules
, list
) {
2235 if (mod
->num_exentries
== 0)
2238 e
= search_extable(mod
->extable
,
2239 mod
->extable
+ mod
->num_exentries
- 1,
2244 spin_unlock_irqrestore(&modlist_lock
, flags
);
2246 /* Now, if we found one, we are running inside it now, hence
2247 we cannot unload the module, hence no refcnt needed. */
2251 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2252 struct module
*__module_text_address(unsigned long addr
)
2256 list_for_each_entry(mod
, &modules
, list
)
2257 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2258 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2263 struct module
*module_text_address(unsigned long addr
)
2266 unsigned long flags
;
2268 spin_lock_irqsave(&modlist_lock
, flags
);
2269 mod
= __module_text_address(addr
);
2270 spin_unlock_irqrestore(&modlist_lock
, flags
);
2275 /* Don't grab lock, we're oopsing. */
2276 void print_modules(void)
2280 printk("Modules linked in:");
2281 list_for_each_entry(mod
, &modules
, list
)
2282 printk(" %s", mod
->name
);
2286 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2291 /* Don't check return code; this call is idempotent */
2292 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2294 EXPORT_SYMBOL(module_add_driver
);
2296 void module_remove_driver(struct device_driver
*drv
)
2300 sysfs_remove_link(&drv
->kobj
, "module");
2302 EXPORT_SYMBOL(module_remove_driver
);
2304 #ifdef CONFIG_MODVERSIONS
2305 /* Generate the signature for struct module here, too, for modversions. */
2306 void struct_module(struct module
*mod
) { return; }
2307 EXPORT_SYMBOL(struct_module
);