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/cpu.h>
32 #include <linux/moduleparam.h>
33 #include <linux/errno.h>
34 #include <linux/err.h>
35 #include <linux/vermagic.h>
36 #include <linux/notifier.h>
37 #include <linux/stop_machine.h>
38 #include <linux/device.h>
39 #include <linux/string.h>
40 #include <linux/sched.h>
41 #include <asm/uaccess.h>
42 #include <asm/semaphore.h>
43 #include <asm/cacheflush.h>
48 #define DEBUGP(fmt , a...)
51 #ifndef ARCH_SHF_SMALL
52 #define ARCH_SHF_SMALL 0
55 /* If this is set, the section belongs in the init part of the module */
56 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
58 /* Protects module list */
59 static DEFINE_SPINLOCK(modlist_lock
);
61 /* List of modules, protected by module_mutex AND modlist_lock */
62 static DECLARE_MUTEX(module_mutex
);
63 static LIST_HEAD(modules
);
65 static DECLARE_MUTEX(notify_mutex
);
66 static struct notifier_block
* module_notify_list
;
68 int register_module_notifier(struct notifier_block
* nb
)
72 err
= notifier_chain_register(&module_notify_list
, nb
);
76 EXPORT_SYMBOL(register_module_notifier
);
78 int unregister_module_notifier(struct notifier_block
* nb
)
82 err
= notifier_chain_unregister(&module_notify_list
, nb
);
86 EXPORT_SYMBOL(unregister_module_notifier
);
88 /* We require a truly strong try_module_get() */
89 static inline int strong_try_module_get(struct module
*mod
)
91 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
93 return try_module_get(mod
);
96 /* A thread that wants to hold a reference to a module only while it
97 * is running can call ths to safely exit.
98 * nfsd and lockd use this.
100 void __module_put_and_exit(struct module
*mod
, long code
)
105 EXPORT_SYMBOL(__module_put_and_exit
);
107 /* Find a module section: 0 means not found. */
108 static unsigned int find_sec(Elf_Ehdr
*hdr
,
110 const char *secstrings
,
115 for (i
= 1; i
< hdr
->e_shnum
; i
++)
116 /* Alloc bit cleared means "ignore it." */
117 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
118 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
123 /* Provided by the linker */
124 extern const struct kernel_symbol __start___ksymtab
[];
125 extern const struct kernel_symbol __stop___ksymtab
[];
126 extern const struct kernel_symbol __start___ksymtab_gpl
[];
127 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
128 extern const unsigned long __start___kcrctab
[];
129 extern const unsigned long __start___kcrctab_gpl
[];
131 #ifndef CONFIG_MODVERSIONS
132 #define symversion(base, idx) NULL
134 #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL)
137 /* Find a symbol, return value, crc and module which owns it */
138 static unsigned long __find_symbol(const char *name
,
139 struct module
**owner
,
140 const unsigned long **crc
,
146 /* Core kernel first. */
148 for (i
= 0; __start___ksymtab
+i
< __stop___ksymtab
; i
++) {
149 if (strcmp(__start___ksymtab
[i
].name
, name
) == 0) {
150 *crc
= symversion(__start___kcrctab
, i
);
151 return __start___ksymtab
[i
].value
;
155 for (i
= 0; __start___ksymtab_gpl
+i
<__stop___ksymtab_gpl
; i
++)
156 if (strcmp(__start___ksymtab_gpl
[i
].name
, name
) == 0) {
157 *crc
= symversion(__start___kcrctab_gpl
, i
);
158 return __start___ksymtab_gpl
[i
].value
;
162 /* Now try modules. */
163 list_for_each_entry(mod
, &modules
, list
) {
165 for (i
= 0; i
< mod
->num_syms
; i
++)
166 if (strcmp(mod
->syms
[i
].name
, name
) == 0) {
167 *crc
= symversion(mod
->crcs
, i
);
168 return mod
->syms
[i
].value
;
172 for (i
= 0; i
< mod
->num_gpl_syms
; i
++) {
173 if (strcmp(mod
->gpl_syms
[i
].name
, name
) == 0) {
174 *crc
= symversion(mod
->gpl_crcs
, i
);
175 return mod
->gpl_syms
[i
].value
;
180 DEBUGP("Failed to find symbol %s\n", name
);
184 /* Find a symbol in this elf symbol table */
185 static unsigned long find_local_symbol(Elf_Shdr
*sechdrs
,
186 unsigned int symindex
,
191 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
193 /* Search (defined) internal symbols first. */
194 for (i
= 1; i
< sechdrs
[symindex
].sh_size
/sizeof(*sym
); i
++) {
195 if (sym
[i
].st_shndx
!= SHN_UNDEF
196 && strcmp(name
, strtab
+ sym
[i
].st_name
) == 0)
197 return sym
[i
].st_value
;
202 /* Search for module by name: must hold module_mutex. */
203 static struct module
*find_module(const char *name
)
207 list_for_each_entry(mod
, &modules
, list
) {
208 if (strcmp(mod
->name
, name
) == 0)
215 /* Number of blocks used and allocated. */
216 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
217 /* Size of each block. -ve means used. */
218 static int *pcpu_size
;
220 static int split_block(unsigned int i
, unsigned short size
)
222 /* Reallocation required? */
223 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
224 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
229 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
230 pcpu_num_allocated
*= 2;
235 /* Insert a new subblock */
236 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
237 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
240 pcpu_size
[i
+1] -= size
;
245 static inline unsigned int block_size(int val
)
252 /* Created by linker magic */
253 extern char __per_cpu_start
[], __per_cpu_end
[];
255 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
262 if (align
> SMP_CACHE_BYTES
) {
263 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
264 name
, align
, SMP_CACHE_BYTES
);
265 align
= SMP_CACHE_BYTES
;
268 ptr
= __per_cpu_start
;
269 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
270 /* Extra for alignment requirement. */
271 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
272 BUG_ON(i
== 0 && extra
!= 0);
274 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
277 /* Transfer extra to previous block. */
278 if (pcpu_size
[i
-1] < 0)
279 pcpu_size
[i
-1] -= extra
;
281 pcpu_size
[i
-1] += extra
;
282 pcpu_size
[i
] -= extra
;
285 /* Split block if warranted */
286 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
287 if (!split_block(i
, size
))
291 pcpu_size
[i
] = -pcpu_size
[i
];
295 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
300 static void percpu_modfree(void *freeme
)
303 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
305 /* First entry is core kernel percpu data. */
306 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
308 pcpu_size
[i
] = -pcpu_size
[i
];
315 /* Merge with previous? */
316 if (pcpu_size
[i
-1] >= 0) {
317 pcpu_size
[i
-1] += pcpu_size
[i
];
319 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
320 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
323 /* Merge with next? */
324 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
325 pcpu_size
[i
] += pcpu_size
[i
+1];
327 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
328 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
332 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
334 const char *secstrings
)
336 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
339 static int percpu_modinit(void)
342 pcpu_num_allocated
= 2;
343 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
345 /* Static in-kernel percpu data (used). */
346 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
348 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
349 if (pcpu_size
[1] < 0) {
350 printk(KERN_ERR
"No per-cpu room for modules.\n");
356 __initcall(percpu_modinit
);
357 #else /* ... !CONFIG_SMP */
358 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
363 static inline void percpu_modfree(void *pcpuptr
)
367 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
369 const char *secstrings
)
373 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
376 /* pcpusec should be 0, and size of that section should be 0. */
379 #endif /* CONFIG_SMP */
381 #ifdef CONFIG_MODULE_UNLOAD
382 #define MODINFO_ATTR(field) \
383 static void setup_modinfo_##field(struct module *mod, const char *s) \
385 mod->field = kstrdup(s, GFP_KERNEL); \
387 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
388 struct module *mod, char *buffer) \
390 return sprintf(buffer, "%s\n", mod->field); \
392 static int modinfo_##field##_exists(struct module *mod) \
394 return mod->field != NULL; \
396 static void free_modinfo_##field(struct module *mod) \
401 static struct module_attribute modinfo_##field = { \
402 .attr = { .name = __stringify(field), .mode = 0444, \
403 .owner = THIS_MODULE }, \
404 .show = show_modinfo_##field, \
405 .setup = setup_modinfo_##field, \
406 .test = modinfo_##field##_exists, \
407 .free = free_modinfo_##field, \
410 MODINFO_ATTR(version
);
411 MODINFO_ATTR(srcversion
);
413 static struct module_attribute
*modinfo_attrs
[] = {
419 /* Init the unload section of the module. */
420 static void module_unload_init(struct module
*mod
)
424 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
425 for (i
= 0; i
< NR_CPUS
; i
++)
426 local_set(&mod
->ref
[i
].count
, 0);
427 /* Hold reference count during initialization. */
428 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
429 /* Backwards compatibility macros put refcount during init. */
430 mod
->waiter
= current
;
433 /* modules using other modules */
436 struct list_head list
;
437 struct module
*module_which_uses
;
440 /* Does a already use b? */
441 static int already_uses(struct module
*a
, struct module
*b
)
443 struct module_use
*use
;
445 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
446 if (use
->module_which_uses
== a
) {
447 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
451 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
455 /* Module a uses b */
456 static int use_module(struct module
*a
, struct module
*b
)
458 struct module_use
*use
;
459 if (b
== NULL
|| already_uses(a
, b
)) return 1;
461 if (!strong_try_module_get(b
))
464 DEBUGP("Allocating new usage for %s.\n", a
->name
);
465 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
467 printk("%s: out of memory loading\n", a
->name
);
472 use
->module_which_uses
= a
;
473 list_add(&use
->list
, &b
->modules_which_use_me
);
477 /* Clear the unload stuff of the module. */
478 static void module_unload_free(struct module
*mod
)
482 list_for_each_entry(i
, &modules
, list
) {
483 struct module_use
*use
;
485 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
486 if (use
->module_which_uses
== mod
) {
487 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
489 list_del(&use
->list
);
491 /* There can be at most one match. */
498 #ifdef CONFIG_MODULE_FORCE_UNLOAD
499 static inline int try_force_unload(unsigned int flags
)
501 int ret
= (flags
& O_TRUNC
);
503 add_taint(TAINT_FORCED_RMMOD
);
507 static inline int try_force_unload(unsigned int flags
)
511 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
520 /* Whole machine is stopped with interrupts off when this runs. */
521 static int __try_stop_module(void *_sref
)
523 struct stopref
*sref
= _sref
;
525 /* If it's not unused, quit unless we are told to block. */
526 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
527 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
531 /* Mark it as dying. */
532 sref
->mod
->state
= MODULE_STATE_GOING
;
536 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
538 struct stopref sref
= { mod
, flags
, forced
};
540 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
543 unsigned int module_refcount(struct module
*mod
)
545 unsigned int i
, total
= 0;
547 for (i
= 0; i
< NR_CPUS
; i
++)
548 total
+= local_read(&mod
->ref
[i
].count
);
551 EXPORT_SYMBOL(module_refcount
);
553 /* This exists whether we can unload or not */
554 static void free_module(struct module
*mod
);
556 static void wait_for_zero_refcount(struct module
*mod
)
558 /* Since we might sleep for some time, drop the semaphore first */
561 DEBUGP("Looking at refcount...\n");
562 set_current_state(TASK_UNINTERRUPTIBLE
);
563 if (module_refcount(mod
) == 0)
567 current
->state
= TASK_RUNNING
;
572 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
575 char name
[MODULE_NAME_LEN
];
578 if (!capable(CAP_SYS_MODULE
))
581 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
583 name
[MODULE_NAME_LEN
-1] = '\0';
585 if (down_interruptible(&module_mutex
) != 0)
588 mod
= find_module(name
);
594 if (!list_empty(&mod
->modules_which_use_me
)) {
595 /* Other modules depend on us: get rid of them first. */
600 /* Doing init or already dying? */
601 if (mod
->state
!= MODULE_STATE_LIVE
) {
602 /* FIXME: if (force), slam module count and wake up
604 DEBUGP("%s already dying\n", mod
->name
);
609 /* If it has an init func, it must have an exit func to unload */
610 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
612 forced
= try_force_unload(flags
);
614 /* This module can't be removed */
620 /* Set this up before setting mod->state */
621 mod
->waiter
= current
;
623 /* Stop the machine so refcounts can't move and disable module. */
624 ret
= try_stop_module(mod
, flags
, &forced
);
628 /* Never wait if forced. */
629 if (!forced
&& module_refcount(mod
) != 0)
630 wait_for_zero_refcount(mod
);
632 /* Final destruction now noone is using it. */
633 if (mod
->exit
!= NULL
) {
645 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
647 struct module_use
*use
;
648 int printed_something
= 0;
650 seq_printf(m
, " %u ", module_refcount(mod
));
652 /* Always include a trailing , so userspace can differentiate
653 between this and the old multi-field proc format. */
654 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
655 printed_something
= 1;
656 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
660 printed_something
= 1;
661 seq_printf(m
, "[unsafe],");
664 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
665 printed_something
= 1;
666 seq_printf(m
, "[permanent],");
669 if (!printed_something
)
673 void __symbol_put(const char *symbol
)
675 struct module
*owner
;
677 const unsigned long *crc
;
679 spin_lock_irqsave(&modlist_lock
, flags
);
680 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
683 spin_unlock_irqrestore(&modlist_lock
, flags
);
685 EXPORT_SYMBOL(__symbol_put
);
687 void symbol_put_addr(void *addr
)
691 spin_lock_irqsave(&modlist_lock
, flags
);
692 if (!kernel_text_address((unsigned long)addr
))
695 module_put(module_text_address((unsigned long)addr
));
696 spin_unlock_irqrestore(&modlist_lock
, flags
);
698 EXPORT_SYMBOL_GPL(symbol_put_addr
);
700 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
701 struct module
*mod
, char *buffer
)
703 /* sysfs holds a reference */
704 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
707 static struct module_attribute refcnt
= {
708 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
712 #else /* !CONFIG_MODULE_UNLOAD */
713 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
715 /* We don't know the usage count, or what modules are using. */
716 seq_printf(m
, " - -");
719 static inline void module_unload_free(struct module
*mod
)
723 static inline int use_module(struct module
*a
, struct module
*b
)
725 return strong_try_module_get(b
);
728 static inline void module_unload_init(struct module
*mod
)
731 #endif /* CONFIG_MODULE_UNLOAD */
733 #ifdef CONFIG_OBSOLETE_MODPARM
734 /* Bounds checking done below */
735 static int obsparm_copy_string(const char *val
, struct kernel_param
*kp
)
737 strcpy(kp
->arg
, val
);
741 static int set_obsolete(const char *val
, struct kernel_param
*kp
)
743 unsigned int min
, max
;
744 unsigned int size
, maxsize
;
748 struct obsolete_modparm
*obsparm
= kp
->arg
;
751 printk(KERN_ERR
"Parameter %s needs an argument\n", kp
->name
);
755 /* type is: [min[-max]]{b,h,i,l,s} */
757 min
= simple_strtol(p
, &endp
, 10);
758 if (endp
== obsparm
->type
)
760 else if (*endp
== '-') {
762 max
= simple_strtol(p
, &endp
, 10);
767 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
768 1, param_set_byte
, &dummy
);
770 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
771 sizeof(short), param_set_short
, &dummy
);
773 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
774 sizeof(int), param_set_int
, &dummy
);
776 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
777 sizeof(long), param_set_long
, &dummy
);
779 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
780 sizeof(char *), param_set_charp
, &dummy
);
783 /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars,
784 and the decl is "char xxx[5][50];" */
786 maxsize
= simple_strtol(p
, &endp
, 10);
787 /* We check lengths here (yes, this is a hack). */
789 while (p
[size
= strcspn(p
, ",")]) {
796 return param_array(kp
->name
, val
, min
, max
, obsparm
->addr
,
797 maxsize
, obsparm_copy_string
, &dummy
);
799 printk(KERN_ERR
"Unknown obsolete parameter type %s\n", obsparm
->type
);
803 "Parameter %s doesn't fit in %u chars.\n", kp
->name
, maxsize
);
807 static int obsolete_params(const char *name
,
809 struct obsolete_modparm obsparm
[],
812 unsigned int symindex
,
815 struct kernel_param
*kp
;
819 kp
= kmalloc(sizeof(kp
[0]) * num
, GFP_KERNEL
);
823 for (i
= 0; i
< num
; i
++) {
824 char sym_name
[128 + sizeof(MODULE_SYMBOL_PREFIX
)];
826 snprintf(sym_name
, sizeof(sym_name
), "%s%s",
827 MODULE_SYMBOL_PREFIX
, obsparm
[i
].name
);
829 kp
[i
].name
= obsparm
[i
].name
;
831 kp
[i
].set
= set_obsolete
;
834 = (void *)find_local_symbol(sechdrs
, symindex
, strtab
,
836 if (!obsparm
[i
].addr
) {
837 printk("%s: falsely claims to have parameter %s\n",
838 name
, obsparm
[i
].name
);
842 kp
[i
].arg
= &obsparm
[i
];
845 ret
= parse_args(name
, args
, kp
, num
, NULL
);
851 static int obsolete_params(const char *name
,
853 struct obsolete_modparm obsparm
[],
856 unsigned int symindex
,
860 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
864 #endif /* CONFIG_OBSOLETE_MODPARM */
866 static const char vermagic
[] = VERMAGIC_STRING
;
868 #ifdef CONFIG_MODVERSIONS
869 static int check_version(Elf_Shdr
*sechdrs
,
870 unsigned int versindex
,
873 const unsigned long *crc
)
875 unsigned int i
, num_versions
;
876 struct modversion_info
*versions
;
878 /* Exporting module didn't supply crcs? OK, we're already tainted. */
882 versions
= (void *) sechdrs
[versindex
].sh_addr
;
883 num_versions
= sechdrs
[versindex
].sh_size
884 / sizeof(struct modversion_info
);
886 for (i
= 0; i
< num_versions
; i
++) {
887 if (strcmp(versions
[i
].name
, symname
) != 0)
890 if (versions
[i
].crc
== *crc
)
892 printk("%s: disagrees about version of symbol %s\n",
894 DEBUGP("Found checksum %lX vs module %lX\n",
895 *crc
, versions
[i
].crc
);
898 /* Not in module's version table. OK, but that taints the kernel. */
899 if (!(tainted
& TAINT_FORCED_MODULE
)) {
900 printk("%s: no version for \"%s\" found: kernel tainted.\n",
902 add_taint(TAINT_FORCED_MODULE
);
907 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
908 unsigned int versindex
,
911 const unsigned long *crc
;
912 struct module
*owner
;
914 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
916 return check_version(sechdrs
, versindex
, "struct_module", mod
,
920 /* First part is kernel version, which we ignore. */
921 static inline int same_magic(const char *amagic
, const char *bmagic
)
923 amagic
+= strcspn(amagic
, " ");
924 bmagic
+= strcspn(bmagic
, " ");
925 return strcmp(amagic
, bmagic
) == 0;
928 static inline int check_version(Elf_Shdr
*sechdrs
,
929 unsigned int versindex
,
932 const unsigned long *crc
)
937 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
938 unsigned int versindex
,
944 static inline int same_magic(const char *amagic
, const char *bmagic
)
946 return strcmp(amagic
, bmagic
) == 0;
948 #endif /* CONFIG_MODVERSIONS */
950 /* Resolve a symbol for this module. I.e. if we find one, record usage.
951 Must be holding module_mutex. */
952 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
953 unsigned int versindex
,
957 struct module
*owner
;
959 const unsigned long *crc
;
961 spin_lock_irq(&modlist_lock
);
962 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
964 /* use_module can fail due to OOM, or module unloading */
965 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
966 !use_module(mod
, owner
))
969 spin_unlock_irq(&modlist_lock
);
975 * /sys/module/foo/sections stuff
976 * J. Corbet <corbet@lwn.net>
978 #ifdef CONFIG_KALLSYMS
979 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
980 struct module
*mod
, char *buf
)
982 struct module_sect_attr
*sattr
=
983 container_of(mattr
, struct module_sect_attr
, mattr
);
984 return sprintf(buf
, "0x%lx\n", sattr
->address
);
987 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
988 char *secstrings
, Elf_Shdr
*sechdrs
)
990 unsigned int nloaded
= 0, i
, size
[2];
991 struct module_sect_attrs
*sect_attrs
;
992 struct module_sect_attr
*sattr
;
993 struct attribute
**gattr
;
995 /* Count loaded sections and allocate structures */
996 for (i
= 0; i
< nsect
; i
++)
997 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
999 size
[0] = ALIGN(sizeof(*sect_attrs
)
1000 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1001 sizeof(sect_attrs
->grp
.attrs
[0]));
1002 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1003 if (! (sect_attrs
= kmalloc(size
[0] + size
[1], GFP_KERNEL
)))
1006 /* Setup section attributes. */
1007 sect_attrs
->grp
.name
= "sections";
1008 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1010 sattr
= §_attrs
->attrs
[0];
1011 gattr
= §_attrs
->grp
.attrs
[0];
1012 for (i
= 0; i
< nsect
; i
++) {
1013 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1015 sattr
->address
= sechdrs
[i
].sh_addr
;
1016 strlcpy(sattr
->name
, secstrings
+ sechdrs
[i
].sh_name
,
1017 MODULE_SECT_NAME_LEN
);
1018 sattr
->mattr
.show
= module_sect_show
;
1019 sattr
->mattr
.store
= NULL
;
1020 sattr
->mattr
.attr
.name
= sattr
->name
;
1021 sattr
->mattr
.attr
.owner
= mod
;
1022 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1023 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1027 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1030 mod
->sect_attrs
= sect_attrs
;
1036 static void remove_sect_attrs(struct module
*mod
)
1038 if (mod
->sect_attrs
) {
1039 sysfs_remove_group(&mod
->mkobj
.kobj
,
1040 &mod
->sect_attrs
->grp
);
1041 /* We are positive that no one is using any sect attrs
1042 * at this point. Deallocate immediately. */
1043 kfree(mod
->sect_attrs
);
1044 mod
->sect_attrs
= NULL
;
1050 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1051 char *sectstrings
, Elf_Shdr
*sechdrs
)
1055 static inline void remove_sect_attrs(struct module
*mod
)
1058 #endif /* CONFIG_KALLSYMS */
1061 #ifdef CONFIG_MODULE_UNLOAD
1062 static inline int module_add_refcnt_attr(struct module
*mod
)
1064 return sysfs_create_file(&mod
->mkobj
.kobj
, &refcnt
.attr
);
1066 static void module_remove_refcnt_attr(struct module
*mod
)
1068 return sysfs_remove_file(&mod
->mkobj
.kobj
, &refcnt
.attr
);
1071 static inline int module_add_refcnt_attr(struct module
*mod
)
1075 static void module_remove_refcnt_attr(struct module
*mod
)
1080 #ifdef CONFIG_MODULE_UNLOAD
1081 static int module_add_modinfo_attrs(struct module
*mod
)
1083 struct module_attribute
*attr
;
1087 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1089 (attr
->test
&& attr
->test(mod
)))
1090 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1095 static void module_remove_modinfo_attrs(struct module
*mod
)
1097 struct module_attribute
*attr
;
1100 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1101 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1107 static int mod_sysfs_setup(struct module
*mod
,
1108 struct kernel_param
*kparam
,
1109 unsigned int num_params
)
1113 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1114 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1117 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1118 mod
->mkobj
.mod
= mod
;
1119 err
= kobject_register(&mod
->mkobj
.kobj
);
1123 err
= module_add_refcnt_attr(mod
);
1127 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1131 #ifdef CONFIG_MODULE_UNLOAD
1132 err
= module_add_modinfo_attrs(mod
);
1140 kobject_unregister(&mod
->mkobj
.kobj
);
1145 static void mod_kobject_remove(struct module
*mod
)
1147 #ifdef CONFIG_MODULE_UNLOAD
1148 module_remove_modinfo_attrs(mod
);
1150 module_remove_refcnt_attr(mod
);
1151 module_param_sysfs_remove(mod
);
1153 kobject_unregister(&mod
->mkobj
.kobj
);
1157 * unlink the module with the whole machine is stopped with interrupts off
1158 * - this defends against kallsyms not taking locks
1160 static int __unlink_module(void *_mod
)
1162 struct module
*mod
= _mod
;
1163 list_del(&mod
->list
);
1167 /* Free a module, remove from lists, etc (must hold module mutex). */
1168 static void free_module(struct module
*mod
)
1170 /* Delete from various lists */
1171 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1172 remove_sect_attrs(mod
);
1173 mod_kobject_remove(mod
);
1175 /* Arch-specific cleanup. */
1176 module_arch_cleanup(mod
);
1178 /* Module unload stuff */
1179 module_unload_free(mod
);
1181 /* This may be NULL, but that's OK */
1182 module_free(mod
, mod
->module_init
);
1185 percpu_modfree(mod
->percpu
);
1187 /* Finally, free the core (containing the module structure) */
1188 module_free(mod
, mod
->module_core
);
1191 void *__symbol_get(const char *symbol
)
1193 struct module
*owner
;
1194 unsigned long value
, flags
;
1195 const unsigned long *crc
;
1197 spin_lock_irqsave(&modlist_lock
, flags
);
1198 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1199 if (value
&& !strong_try_module_get(owner
))
1201 spin_unlock_irqrestore(&modlist_lock
, flags
);
1203 return (void *)value
;
1205 EXPORT_SYMBOL_GPL(__symbol_get
);
1208 * Ensure that an exported symbol [global namespace] does not already exist
1209 * in the Kernel or in some other modules exported symbol table.
1211 static int verify_export_symbols(struct module
*mod
)
1213 const char *name
= NULL
;
1214 unsigned long i
, ret
= 0;
1215 struct module
*owner
;
1216 const unsigned long *crc
;
1218 for (i
= 0; i
< mod
->num_syms
; i
++)
1219 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1220 name
= mod
->syms
[i
].name
;
1225 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1226 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1227 name
= mod
->gpl_syms
[i
].name
;
1234 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1235 mod
->name
, name
, module_name(owner
));
1240 /* Change all symbols so that sh_value encodes the pointer directly. */
1241 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1242 unsigned int symindex
,
1244 unsigned int versindex
,
1245 unsigned int pcpuindex
,
1248 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1249 unsigned long secbase
;
1250 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1253 for (i
= 1; i
< n
; i
++) {
1254 switch (sym
[i
].st_shndx
) {
1256 /* We compiled with -fno-common. These are not
1257 supposed to happen. */
1258 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1259 printk("%s: please compile with -fno-common\n",
1265 /* Don't need to do anything */
1266 DEBUGP("Absolute symbol: 0x%08lx\n",
1267 (long)sym
[i
].st_value
);
1272 = resolve_symbol(sechdrs
, versindex
,
1273 strtab
+ sym
[i
].st_name
, mod
);
1275 /* Ok if resolved. */
1276 if (sym
[i
].st_value
!= 0)
1279 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1282 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1283 mod
->name
, strtab
+ sym
[i
].st_name
);
1288 /* Divert to percpu allocation if a percpu var. */
1289 if (sym
[i
].st_shndx
== pcpuindex
)
1290 secbase
= (unsigned long)mod
->percpu
;
1292 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1293 sym
[i
].st_value
+= secbase
;
1301 /* Update size with this section: return offset. */
1302 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1306 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1307 *size
= ret
+ sechdr
->sh_size
;
1311 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1312 might -- code, read-only data, read-write data, small data. Tally
1313 sizes, and place the offsets into sh_entsize fields: high bit means it
1315 static void layout_sections(struct module
*mod
,
1316 const Elf_Ehdr
*hdr
,
1318 const char *secstrings
)
1320 static unsigned long const masks
[][2] = {
1321 /* NOTE: all executable code must be the first section
1322 * in this array; otherwise modify the text_size
1323 * finder in the two loops below */
1324 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1325 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1326 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1327 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1331 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1332 sechdrs
[i
].sh_entsize
= ~0UL;
1334 DEBUGP("Core section allocation order:\n");
1335 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1336 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1337 Elf_Shdr
*s
= &sechdrs
[i
];
1339 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1340 || (s
->sh_flags
& masks
[m
][1])
1341 || s
->sh_entsize
!= ~0UL
1342 || strncmp(secstrings
+ s
->sh_name
,
1345 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1346 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1349 mod
->core_text_size
= mod
->core_size
;
1352 DEBUGP("Init section allocation order:\n");
1353 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1354 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1355 Elf_Shdr
*s
= &sechdrs
[i
];
1357 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1358 || (s
->sh_flags
& masks
[m
][1])
1359 || s
->sh_entsize
!= ~0UL
1360 || strncmp(secstrings
+ s
->sh_name
,
1363 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1364 | INIT_OFFSET_MASK
);
1365 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1368 mod
->init_text_size
= mod
->init_size
;
1372 static inline int license_is_gpl_compatible(const char *license
)
1374 return (strcmp(license
, "GPL") == 0
1375 || strcmp(license
, "GPL v2") == 0
1376 || strcmp(license
, "GPL and additional rights") == 0
1377 || strcmp(license
, "Dual BSD/GPL") == 0
1378 || strcmp(license
, "Dual MPL/GPL") == 0);
1381 static void set_license(struct module
*mod
, const char *license
)
1384 license
= "unspecified";
1386 mod
->license_gplok
= license_is_gpl_compatible(license
);
1387 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1388 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1389 mod
->name
, license
);
1390 add_taint(TAINT_PROPRIETARY_MODULE
);
1394 /* Parse tag=value strings from .modinfo section */
1395 static char *next_string(char *string
, unsigned long *secsize
)
1397 /* Skip non-zero chars */
1400 if ((*secsize
)-- <= 1)
1404 /* Skip any zero padding. */
1405 while (!string
[0]) {
1407 if ((*secsize
)-- <= 1)
1413 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1418 unsigned int taglen
= strlen(tag
);
1419 unsigned long size
= sechdrs
[info
].sh_size
;
1421 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1422 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1423 return p
+ taglen
+ 1;
1428 #ifdef CONFIG_MODULE_UNLOAD
1429 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1430 unsigned int infoindex
)
1432 struct module_attribute
*attr
;
1435 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1438 get_modinfo(sechdrs
,
1445 #ifdef CONFIG_KALLSYMS
1446 int is_exported(const char *name
, const struct module
*mod
)
1451 for (i
= 0; __start___ksymtab
+i
< __stop___ksymtab
; i
++)
1452 if (strcmp(__start___ksymtab
[i
].name
, name
) == 0)
1456 for (i
= 0; i
< mod
->num_syms
; i
++)
1457 if (strcmp(mod
->syms
[i
].name
, name
) == 0)
1463 static char elf_type(const Elf_Sym
*sym
,
1465 const char *secstrings
,
1468 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1469 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1474 if (sym
->st_shndx
== SHN_UNDEF
)
1476 if (sym
->st_shndx
== SHN_ABS
)
1478 if (sym
->st_shndx
>= SHN_LORESERVE
)
1480 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1482 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1483 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1484 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1486 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1491 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1492 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1497 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1498 ".debug", strlen(".debug")) == 0)
1503 static void add_kallsyms(struct module
*mod
,
1505 unsigned int symindex
,
1506 unsigned int strindex
,
1507 const char *secstrings
)
1511 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1512 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1513 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1515 /* Set types up while we still have access to sections. */
1516 for (i
= 0; i
< mod
->num_symtab
; i
++)
1517 mod
->symtab
[i
].st_info
1518 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1521 static inline void add_kallsyms(struct module
*mod
,
1523 unsigned int symindex
,
1524 unsigned int strindex
,
1525 const char *secstrings
)
1528 #endif /* CONFIG_KALLSYMS */
1530 /* Allocate and load the module: note that size of section 0 is always
1531 zero, and we rely on this for optional sections. */
1532 static struct module
*load_module(void __user
*umod
,
1534 const char __user
*uargs
)
1538 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1539 unsigned int i
, symindex
= 0, strindex
= 0, setupindex
, exindex
,
1540 exportindex
, modindex
, obsparmindex
, infoindex
, gplindex
,
1541 crcindex
, gplcrcindex
, versindex
, pcpuindex
;
1545 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1546 struct exception_table_entry
*extable
;
1547 mm_segment_t old_fs
;
1549 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1551 if (len
< sizeof(*hdr
))
1552 return ERR_PTR(-ENOEXEC
);
1554 /* Suck in entire file: we'll want most of it. */
1555 /* vmalloc barfs on "unusual" numbers. Check here */
1556 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1557 return ERR_PTR(-ENOMEM
);
1558 if (copy_from_user(hdr
, umod
, len
) != 0) {
1563 /* Sanity checks against insmoding binaries or wrong arch,
1564 weird elf version */
1565 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1566 || hdr
->e_type
!= ET_REL
1567 || !elf_check_arch(hdr
)
1568 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1573 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1576 /* Convenience variables */
1577 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1578 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1579 sechdrs
[0].sh_addr
= 0;
1581 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1582 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1583 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1586 /* Mark all sections sh_addr with their address in the
1588 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1590 /* Internal symbols and strings. */
1591 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1593 strindex
= sechdrs
[i
].sh_link
;
1594 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1596 #ifndef CONFIG_MODULE_UNLOAD
1597 /* Don't load .exit sections */
1598 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1599 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1603 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1604 ".gnu.linkonce.this_module");
1606 printk(KERN_WARNING
"No module found in object\n");
1610 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1612 if (symindex
== 0) {
1613 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1619 /* Optional sections */
1620 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1621 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1622 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1623 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1624 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1625 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1626 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1627 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1628 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1629 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1631 /* Don't keep modinfo section */
1632 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1633 #ifdef CONFIG_KALLSYMS
1634 /* Keep symbol and string tables for decoding later. */
1635 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1636 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1639 /* Check module struct version now, before we try to use module. */
1640 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1645 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1646 /* This is allowed: modprobe --force will invalidate it. */
1648 add_taint(TAINT_FORCED_MODULE
);
1649 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1651 } else if (!same_magic(modmagic
, vermagic
)) {
1652 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1653 mod
->name
, modmagic
, vermagic
);
1658 /* Now copy in args */
1659 arglen
= strlen_user(uargs
);
1664 args
= kmalloc(arglen
, GFP_KERNEL
);
1669 if (copy_from_user(args
, uargs
, arglen
) != 0) {
1674 if (find_module(mod
->name
)) {
1679 mod
->state
= MODULE_STATE_COMING
;
1681 /* Allow arches to frob section contents and sizes. */
1682 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1687 /* We have a special allocation for this section. */
1688 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1689 sechdrs
[pcpuindex
].sh_addralign
,
1695 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1696 mod
->percpu
= percpu
;
1699 /* Determine total sizes, and put offsets in sh_entsize. For now
1700 this is done generically; there doesn't appear to be any
1701 special cases for the architectures. */
1702 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1704 /* Do the allocs. */
1705 ptr
= module_alloc(mod
->core_size
);
1710 memset(ptr
, 0, mod
->core_size
);
1711 mod
->module_core
= ptr
;
1713 ptr
= module_alloc(mod
->init_size
);
1714 if (!ptr
&& mod
->init_size
) {
1718 memset(ptr
, 0, mod
->init_size
);
1719 mod
->module_init
= ptr
;
1721 /* Transfer each section which specifies SHF_ALLOC */
1722 DEBUGP("final section addresses:\n");
1723 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1726 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1729 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1730 dest
= mod
->module_init
1731 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1733 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1735 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1736 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1737 sechdrs
[i
].sh_size
);
1738 /* Update sh_addr to point to copy in image. */
1739 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1740 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1742 /* Module has been moved. */
1743 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1745 /* Now we've moved module, initialize linked lists, etc. */
1746 module_unload_init(mod
);
1748 /* Set up license info based on the info section */
1749 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1751 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1752 add_taint(TAINT_PROPRIETARY_MODULE
);
1753 if (strcmp(mod
->name
, "driverloader") == 0)
1754 add_taint(TAINT_PROPRIETARY_MODULE
);
1756 #ifdef CONFIG_MODULE_UNLOAD
1757 /* Set up MODINFO_ATTR fields */
1758 setup_modinfo(mod
, sechdrs
, infoindex
);
1761 /* Fix up syms, so that st_value is a pointer to location. */
1762 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1767 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1768 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1769 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1771 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1772 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1773 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1775 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1777 #ifdef CONFIG_MODVERSIONS
1778 if ((mod
->num_syms
&& !crcindex
) ||
1779 (mod
->num_gpl_syms
&& !gplcrcindex
)) {
1780 printk(KERN_WARNING
"%s: No versions for exported symbols."
1781 " Tainting kernel.\n", mod
->name
);
1782 add_taint(TAINT_FORCED_MODULE
);
1786 /* Now do relocations. */
1787 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1788 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1789 unsigned int info
= sechdrs
[i
].sh_info
;
1791 /* Not a valid relocation section? */
1792 if (info
>= hdr
->e_shnum
)
1795 /* Don't bother with non-allocated sections */
1796 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1799 if (sechdrs
[i
].sh_type
== SHT_REL
)
1800 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1801 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1802 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1808 /* Find duplicate symbols */
1809 err
= verify_export_symbols(mod
);
1814 /* Set up and sort exception table */
1815 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1816 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1817 sort_extable(extable
, extable
+ mod
->num_exentries
);
1819 /* Finally, copy percpu area over. */
1820 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1821 sechdrs
[pcpuindex
].sh_size
);
1823 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1825 err
= module_finalize(hdr
, sechdrs
, mod
);
1829 /* flush the icache in correct context */
1834 * Flush the instruction cache, since we've played with text.
1835 * Do it before processing of module parameters, so the module
1836 * can provide parameter accessor functions of its own.
1838 if (mod
->module_init
)
1839 flush_icache_range((unsigned long)mod
->module_init
,
1840 (unsigned long)mod
->module_init
1842 flush_icache_range((unsigned long)mod
->module_core
,
1843 (unsigned long)mod
->module_core
+ mod
->core_size
);
1849 err
= obsolete_params(mod
->name
, mod
->args
,
1850 (struct obsolete_modparm
*)
1851 sechdrs
[obsparmindex
].sh_addr
,
1852 sechdrs
[obsparmindex
].sh_size
1853 / sizeof(struct obsolete_modparm
),
1855 (char *)sechdrs
[strindex
].sh_addr
);
1857 printk(KERN_WARNING
"%s: Ignoring new-style "
1858 "parameters in presence of obsolete ones\n",
1861 /* Size of section 0 is 0, so this works well if no params */
1862 err
= parse_args(mod
->name
, mod
->args
,
1863 (struct kernel_param
*)
1864 sechdrs
[setupindex
].sh_addr
,
1865 sechdrs
[setupindex
].sh_size
1866 / sizeof(struct kernel_param
),
1872 err
= mod_sysfs_setup(mod
,
1873 (struct kernel_param
*)
1874 sechdrs
[setupindex
].sh_addr
,
1875 sechdrs
[setupindex
].sh_size
1876 / sizeof(struct kernel_param
));
1879 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1881 /* Get rid of temporary copy */
1888 module_arch_cleanup(mod
);
1890 module_unload_free(mod
);
1891 module_free(mod
, mod
->module_init
);
1893 module_free(mod
, mod
->module_core
);
1896 percpu_modfree(percpu
);
1901 return ERR_PTR(err
);
1904 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1910 * link the module with the whole machine is stopped with interrupts off
1911 * - this defends against kallsyms not taking locks
1913 static int __link_module(void *_mod
)
1915 struct module
*mod
= _mod
;
1916 list_add(&mod
->list
, &modules
);
1920 /* This is where the real work happens */
1922 sys_init_module(void __user
*umod
,
1924 const char __user
*uargs
)
1929 /* Must have permission */
1930 if (!capable(CAP_SYS_MODULE
))
1933 /* Only one module load at a time, please */
1934 if (down_interruptible(&module_mutex
) != 0)
1937 /* Do all the hard work */
1938 mod
= load_module(umod
, len
, uargs
);
1941 return PTR_ERR(mod
);
1944 /* Now sew it into the lists. They won't access us, since
1945 strong_try_module_get() will fail. */
1946 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1948 /* Drop lock so they can recurse */
1951 down(¬ify_mutex
);
1952 notifier_call_chain(&module_notify_list
, MODULE_STATE_COMING
, mod
);
1955 /* Start the module */
1956 if (mod
->init
!= NULL
)
1959 /* Init routine failed: abort. Try to protect us from
1960 buggy refcounters. */
1961 mod
->state
= MODULE_STATE_GOING
;
1962 synchronize_sched();
1964 printk(KERN_ERR
"%s: module is now stuck!\n",
1968 down(&module_mutex
);
1975 /* Now it's a first class citizen! */
1976 down(&module_mutex
);
1977 mod
->state
= MODULE_STATE_LIVE
;
1978 /* Drop initial reference. */
1980 module_free(mod
, mod
->module_init
);
1981 mod
->module_init
= NULL
;
1983 mod
->init_text_size
= 0;
1989 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
1991 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
1994 #ifdef CONFIG_KALLSYMS
1996 * This ignores the intensely annoying "mapping symbols" found
1997 * in ARM ELF files: $a, $t and $d.
1999 static inline int is_arm_mapping_symbol(const char *str
)
2001 return str
[0] == '$' && strchr("atd", str
[1])
2002 && (str
[2] == '\0' || str
[2] == '.');
2005 static const char *get_ksymbol(struct module
*mod
,
2007 unsigned long *size
,
2008 unsigned long *offset
)
2010 unsigned int i
, best
= 0;
2011 unsigned long nextval
;
2013 /* At worse, next value is at end of module */
2014 if (within(addr
, mod
->module_init
, mod
->init_size
))
2015 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2017 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2019 /* Scan for closest preceeding symbol, and next symbol. (ELF
2020 starts real symbols at 1). */
2021 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2022 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2025 /* We ignore unnamed symbols: they're uninformative
2026 * and inserted at a whim. */
2027 if (mod
->symtab
[i
].st_value
<= addr
2028 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2029 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2030 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2032 if (mod
->symtab
[i
].st_value
> addr
2033 && mod
->symtab
[i
].st_value
< nextval
2034 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2035 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2036 nextval
= mod
->symtab
[i
].st_value
;
2042 *size
= nextval
- mod
->symtab
[best
].st_value
;
2043 *offset
= addr
- mod
->symtab
[best
].st_value
;
2044 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2047 /* For kallsyms to ask for address resolution. NULL means not found.
2048 We don't lock, as this is used for oops resolution and races are a
2050 const char *module_address_lookup(unsigned long addr
,
2051 unsigned long *size
,
2052 unsigned long *offset
,
2057 list_for_each_entry(mod
, &modules
, list
) {
2058 if (within(addr
, mod
->module_init
, mod
->init_size
)
2059 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2060 *modname
= mod
->name
;
2061 return get_ksymbol(mod
, addr
, size
, offset
);
2067 struct module
*module_get_kallsym(unsigned int symnum
,
2068 unsigned long *value
,
2074 down(&module_mutex
);
2075 list_for_each_entry(mod
, &modules
, list
) {
2076 if (symnum
< mod
->num_symtab
) {
2077 *value
= mod
->symtab
[symnum
].st_value
;
2078 *type
= mod
->symtab
[symnum
].st_info
;
2080 mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2085 symnum
-= mod
->num_symtab
;
2091 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2095 for (i
= 0; i
< mod
->num_symtab
; i
++)
2096 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0)
2097 return mod
->symtab
[i
].st_value
;
2101 /* Look for this name: can be of form module:name. */
2102 unsigned long module_kallsyms_lookup_name(const char *name
)
2106 unsigned long ret
= 0;
2108 /* Don't lock: we're in enough trouble already. */
2109 if ((colon
= strchr(name
, ':')) != NULL
) {
2111 if ((mod
= find_module(name
)) != NULL
)
2112 ret
= mod_find_symname(mod
, colon
+1);
2115 list_for_each_entry(mod
, &modules
, list
)
2116 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2121 #endif /* CONFIG_KALLSYMS */
2123 /* Called by the /proc file system to return a list of modules. */
2124 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2126 struct list_head
*i
;
2129 down(&module_mutex
);
2130 list_for_each(i
, &modules
) {
2139 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2141 struct list_head
*i
= p
;
2143 if (i
->next
== &modules
)
2148 static void m_stop(struct seq_file
*m
, void *p
)
2153 static int m_show(struct seq_file
*m
, void *p
)
2155 struct module
*mod
= list_entry(p
, struct module
, list
);
2156 seq_printf(m
, "%s %lu",
2157 mod
->name
, mod
->init_size
+ mod
->core_size
);
2158 print_unload_info(m
, mod
);
2160 /* Informative for users. */
2161 seq_printf(m
, " %s",
2162 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2163 mod
->state
== MODULE_STATE_COMING
? "Loading":
2165 /* Used by oprofile and other similar tools. */
2166 seq_printf(m
, " 0x%p", mod
->module_core
);
2168 seq_printf(m
, "\n");
2172 /* Format: modulename size refcount deps address
2174 Where refcount is a number or -, and deps is a comma-separated list
2177 struct seq_operations modules_op
= {
2184 /* Given an address, look for it in the module exception tables. */
2185 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2187 unsigned long flags
;
2188 const struct exception_table_entry
*e
= NULL
;
2191 spin_lock_irqsave(&modlist_lock
, flags
);
2192 list_for_each_entry(mod
, &modules
, list
) {
2193 if (mod
->num_exentries
== 0)
2196 e
= search_extable(mod
->extable
,
2197 mod
->extable
+ mod
->num_exentries
- 1,
2202 spin_unlock_irqrestore(&modlist_lock
, flags
);
2204 /* Now, if we found one, we are running inside it now, hence
2205 we cannot unload the module, hence no refcnt needed. */
2209 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2210 struct module
*__module_text_address(unsigned long addr
)
2214 list_for_each_entry(mod
, &modules
, list
)
2215 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2216 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2221 struct module
*module_text_address(unsigned long addr
)
2224 unsigned long flags
;
2226 spin_lock_irqsave(&modlist_lock
, flags
);
2227 mod
= __module_text_address(addr
);
2228 spin_unlock_irqrestore(&modlist_lock
, flags
);
2233 /* Don't grab lock, we're oopsing. */
2234 void print_modules(void)
2238 printk("Modules linked in:");
2239 list_for_each_entry(mod
, &modules
, list
)
2240 printk(" %s", mod
->name
);
2244 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2249 /* Don't check return code; this call is idempotent */
2250 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2252 EXPORT_SYMBOL(module_add_driver
);
2254 void module_remove_driver(struct device_driver
*drv
)
2258 sysfs_remove_link(&drv
->kobj
, "module");
2260 EXPORT_SYMBOL(module_remove_driver
);
2262 #ifdef CONFIG_MODVERSIONS
2263 /* Generate the signature for struct module here, too, for modversions. */
2264 void struct_module(struct module
*mod
) { return; }
2265 EXPORT_SYMBOL(struct_module
);