1 /* Rewritten by Rusty Russell, on the backs of many others...
2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/config.h>
20 #include <linux/module.h>
21 #include <linux/moduleloader.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
26 #include <linux/elf.h>
27 #include <linux/seq_file.h>
28 #include <linux/syscalls.h>
29 #include <linux/fcntl.h>
30 #include <linux/rcupdate.h>
31 #include <linux/capability.h>
32 #include <linux/cpu.h>
33 #include <linux/moduleparam.h>
34 #include <linux/errno.h>
35 #include <linux/err.h>
36 #include <linux/vermagic.h>
37 #include <linux/notifier.h>
38 #include <linux/stop_machine.h>
39 #include <linux/device.h>
40 #include <linux/string.h>
41 #include <linux/sched.h>
42 #include <linux/mutex.h>
43 #include <linux/unwind.h>
44 #include <asm/uaccess.h>
45 #include <asm/semaphore.h>
46 #include <asm/cacheflush.h>
47 #include <linux/license.h>
52 #define DEBUGP(fmt , a...)
55 #ifndef ARCH_SHF_SMALL
56 #define ARCH_SHF_SMALL 0
59 /* If this is set, the section belongs in the init part of the module */
60 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
62 /* Protects module list */
63 static DEFINE_SPINLOCK(modlist_lock
);
65 /* List of modules, protected by module_mutex AND modlist_lock */
66 static DEFINE_MUTEX(module_mutex
);
67 static LIST_HEAD(modules
);
69 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
71 int register_module_notifier(struct notifier_block
* nb
)
73 return blocking_notifier_chain_register(&module_notify_list
, nb
);
75 EXPORT_SYMBOL(register_module_notifier
);
77 int unregister_module_notifier(struct notifier_block
* nb
)
79 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
81 EXPORT_SYMBOL(unregister_module_notifier
);
83 /* We require a truly strong try_module_get() */
84 static inline int strong_try_module_get(struct module
*mod
)
86 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
88 return try_module_get(mod
);
91 /* A thread that wants to hold a reference to a module only while it
92 * is running can call ths to safely exit.
93 * nfsd and lockd use this.
95 void __module_put_and_exit(struct module
*mod
, long code
)
100 EXPORT_SYMBOL(__module_put_and_exit
);
102 /* Find a module section: 0 means not found. */
103 static unsigned int find_sec(Elf_Ehdr
*hdr
,
105 const char *secstrings
,
110 for (i
= 1; i
< hdr
->e_shnum
; i
++)
111 /* Alloc bit cleared means "ignore it." */
112 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
113 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
118 /* Provided by the linker */
119 extern const struct kernel_symbol __start___ksymtab
[];
120 extern const struct kernel_symbol __stop___ksymtab
[];
121 extern const struct kernel_symbol __start___ksymtab_gpl
[];
122 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
123 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
124 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
125 extern const unsigned long __start___kcrctab
[];
126 extern const unsigned long __start___kcrctab_gpl
[];
127 extern const unsigned long __start___kcrctab_gpl_future
[];
129 #ifndef CONFIG_MODVERSIONS
130 #define symversion(base, idx) NULL
132 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
135 /* lookup symbol in given range of kernel_symbols */
136 static const struct kernel_symbol
*lookup_symbol(const char *name
,
137 const struct kernel_symbol
*start
,
138 const struct kernel_symbol
*stop
)
140 const struct kernel_symbol
*ks
= start
;
141 for (; ks
< stop
; ks
++)
142 if (strcmp(ks
->name
, name
) == 0)
147 /* Find a symbol, return value, crc and module which owns it */
148 static unsigned long __find_symbol(const char *name
,
149 struct module
**owner
,
150 const unsigned long **crc
,
154 const struct kernel_symbol
*ks
;
156 /* Core kernel first. */
158 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
160 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
164 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
165 __stop___ksymtab_gpl
);
167 *crc
= symversion(__start___kcrctab_gpl
,
168 (ks
- __start___ksymtab_gpl
));
172 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
173 __stop___ksymtab_gpl_future
);
176 printk(KERN_WARNING
"Symbol %s is being used "
177 "by a non-GPL module, which will not "
178 "be allowed in the future\n", name
);
179 printk(KERN_WARNING
"Please see the file "
180 "Documentation/feature-removal-schedule.txt "
181 "in the kernel source tree for more "
184 *crc
= symversion(__start___kcrctab_gpl_future
,
185 (ks
- __start___ksymtab_gpl_future
));
189 /* Now try modules. */
190 list_for_each_entry(mod
, &modules
, list
) {
192 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
194 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
199 ks
= lookup_symbol(name
, mod
->gpl_syms
,
200 mod
->gpl_syms
+ mod
->num_gpl_syms
);
202 *crc
= symversion(mod
->gpl_crcs
,
203 (ks
- mod
->gpl_syms
));
207 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
208 (mod
->gpl_future_syms
+
209 mod
->num_gpl_future_syms
));
212 printk(KERN_WARNING
"Symbol %s is being used "
213 "by a non-GPL module, which will not "
214 "be allowed in the future\n", name
);
215 printk(KERN_WARNING
"Please see the file "
216 "Documentation/feature-removal-schedule.txt "
217 "in the kernel source tree for more "
220 *crc
= symversion(mod
->gpl_future_crcs
,
221 (ks
- mod
->gpl_future_syms
));
225 DEBUGP("Failed to find symbol %s\n", name
);
229 /* Search for module by name: must hold module_mutex. */
230 static struct module
*find_module(const char *name
)
234 list_for_each_entry(mod
, &modules
, list
) {
235 if (strcmp(mod
->name
, name
) == 0)
242 /* Number of blocks used and allocated. */
243 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
244 /* Size of each block. -ve means used. */
245 static int *pcpu_size
;
247 static int split_block(unsigned int i
, unsigned short size
)
249 /* Reallocation required? */
250 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
251 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
256 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
257 pcpu_num_allocated
*= 2;
262 /* Insert a new subblock */
263 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
264 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
267 pcpu_size
[i
+1] -= size
;
272 static inline unsigned int block_size(int val
)
279 /* Created by linker magic */
280 extern char __per_cpu_start
[], __per_cpu_end
[];
282 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
289 if (align
> SMP_CACHE_BYTES
) {
290 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
291 name
, align
, SMP_CACHE_BYTES
);
292 align
= SMP_CACHE_BYTES
;
295 ptr
= __per_cpu_start
;
296 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
297 /* Extra for alignment requirement. */
298 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
299 BUG_ON(i
== 0 && extra
!= 0);
301 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
304 /* Transfer extra to previous block. */
305 if (pcpu_size
[i
-1] < 0)
306 pcpu_size
[i
-1] -= extra
;
308 pcpu_size
[i
-1] += extra
;
309 pcpu_size
[i
] -= extra
;
312 /* Split block if warranted */
313 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
314 if (!split_block(i
, size
))
318 pcpu_size
[i
] = -pcpu_size
[i
];
322 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
327 static void percpu_modfree(void *freeme
)
330 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
332 /* First entry is core kernel percpu data. */
333 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
335 pcpu_size
[i
] = -pcpu_size
[i
];
342 /* Merge with previous? */
343 if (pcpu_size
[i
-1] >= 0) {
344 pcpu_size
[i
-1] += pcpu_size
[i
];
346 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
347 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
350 /* Merge with next? */
351 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
352 pcpu_size
[i
] += pcpu_size
[i
+1];
354 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
355 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
359 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
361 const char *secstrings
)
363 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
366 static int percpu_modinit(void)
369 pcpu_num_allocated
= 2;
370 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
372 /* Static in-kernel percpu data (used). */
373 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
375 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
376 if (pcpu_size
[1] < 0) {
377 printk(KERN_ERR
"No per-cpu room for modules.\n");
383 __initcall(percpu_modinit
);
384 #else /* ... !CONFIG_SMP */
385 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
390 static inline void percpu_modfree(void *pcpuptr
)
394 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
396 const char *secstrings
)
400 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
403 /* pcpusec should be 0, and size of that section should be 0. */
406 #endif /* CONFIG_SMP */
408 #define MODINFO_ATTR(field) \
409 static void setup_modinfo_##field(struct module *mod, const char *s) \
411 mod->field = kstrdup(s, GFP_KERNEL); \
413 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
414 struct module *mod, char *buffer) \
416 return sprintf(buffer, "%s\n", mod->field); \
418 static int modinfo_##field##_exists(struct module *mod) \
420 return mod->field != NULL; \
422 static void free_modinfo_##field(struct module *mod) \
427 static struct module_attribute modinfo_##field = { \
428 .attr = { .name = __stringify(field), .mode = 0444, \
429 .owner = THIS_MODULE }, \
430 .show = show_modinfo_##field, \
431 .setup = setup_modinfo_##field, \
432 .test = modinfo_##field##_exists, \
433 .free = free_modinfo_##field, \
436 MODINFO_ATTR(version
);
437 MODINFO_ATTR(srcversion
);
439 #ifdef CONFIG_MODULE_UNLOAD
440 /* Init the unload section of the module. */
441 static void module_unload_init(struct module
*mod
)
445 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
446 for (i
= 0; i
< NR_CPUS
; i
++)
447 local_set(&mod
->ref
[i
].count
, 0);
448 /* Hold reference count during initialization. */
449 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
450 /* Backwards compatibility macros put refcount during init. */
451 mod
->waiter
= current
;
454 /* modules using other modules */
457 struct list_head list
;
458 struct module
*module_which_uses
;
461 /* Does a already use b? */
462 static int already_uses(struct module
*a
, struct module
*b
)
464 struct module_use
*use
;
466 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
467 if (use
->module_which_uses
== a
) {
468 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
472 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
476 /* Module a uses b */
477 static int use_module(struct module
*a
, struct module
*b
)
479 struct module_use
*use
;
480 if (b
== NULL
|| already_uses(a
, b
)) return 1;
482 if (!strong_try_module_get(b
))
485 DEBUGP("Allocating new usage for %s.\n", a
->name
);
486 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
488 printk("%s: out of memory loading\n", a
->name
);
493 use
->module_which_uses
= a
;
494 list_add(&use
->list
, &b
->modules_which_use_me
);
498 /* Clear the unload stuff of the module. */
499 static void module_unload_free(struct module
*mod
)
503 list_for_each_entry(i
, &modules
, list
) {
504 struct module_use
*use
;
506 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
507 if (use
->module_which_uses
== mod
) {
508 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
510 list_del(&use
->list
);
512 /* There can be at most one match. */
519 #ifdef CONFIG_MODULE_FORCE_UNLOAD
520 static inline int try_force_unload(unsigned int flags
)
522 int ret
= (flags
& O_TRUNC
);
524 add_taint(TAINT_FORCED_RMMOD
);
528 static inline int try_force_unload(unsigned int flags
)
532 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
541 /* Whole machine is stopped with interrupts off when this runs. */
542 static int __try_stop_module(void *_sref
)
544 struct stopref
*sref
= _sref
;
546 /* If it's not unused, quit unless we are told to block. */
547 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
548 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
552 /* Mark it as dying. */
553 sref
->mod
->state
= MODULE_STATE_GOING
;
557 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
559 struct stopref sref
= { mod
, flags
, forced
};
561 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
564 unsigned int module_refcount(struct module
*mod
)
566 unsigned int i
, total
= 0;
568 for (i
= 0; i
< NR_CPUS
; i
++)
569 total
+= local_read(&mod
->ref
[i
].count
);
572 EXPORT_SYMBOL(module_refcount
);
574 /* This exists whether we can unload or not */
575 static void free_module(struct module
*mod
);
577 static void wait_for_zero_refcount(struct module
*mod
)
579 /* Since we might sleep for some time, drop the semaphore first */
580 mutex_unlock(&module_mutex
);
582 DEBUGP("Looking at refcount...\n");
583 set_current_state(TASK_UNINTERRUPTIBLE
);
584 if (module_refcount(mod
) == 0)
588 current
->state
= TASK_RUNNING
;
589 mutex_lock(&module_mutex
);
593 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
596 char name
[MODULE_NAME_LEN
];
599 if (!capable(CAP_SYS_MODULE
))
602 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
604 name
[MODULE_NAME_LEN
-1] = '\0';
606 if (mutex_lock_interruptible(&module_mutex
) != 0)
609 mod
= find_module(name
);
615 if (!list_empty(&mod
->modules_which_use_me
)) {
616 /* Other modules depend on us: get rid of them first. */
621 /* Doing init or already dying? */
622 if (mod
->state
!= MODULE_STATE_LIVE
) {
623 /* FIXME: if (force), slam module count and wake up
625 DEBUGP("%s already dying\n", mod
->name
);
630 /* If it has an init func, it must have an exit func to unload */
631 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
633 forced
= try_force_unload(flags
);
635 /* This module can't be removed */
641 /* Set this up before setting mod->state */
642 mod
->waiter
= current
;
644 /* Stop the machine so refcounts can't move and disable module. */
645 ret
= try_stop_module(mod
, flags
, &forced
);
649 /* Never wait if forced. */
650 if (!forced
&& module_refcount(mod
) != 0)
651 wait_for_zero_refcount(mod
);
653 /* Final destruction now noone is using it. */
654 if (mod
->exit
!= NULL
) {
655 mutex_unlock(&module_mutex
);
657 mutex_lock(&module_mutex
);
662 mutex_unlock(&module_mutex
);
666 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
668 struct module_use
*use
;
669 int printed_something
= 0;
671 seq_printf(m
, " %u ", module_refcount(mod
));
673 /* Always include a trailing , so userspace can differentiate
674 between this and the old multi-field proc format. */
675 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
676 printed_something
= 1;
677 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
681 printed_something
= 1;
682 seq_printf(m
, "[unsafe],");
685 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
686 printed_something
= 1;
687 seq_printf(m
, "[permanent],");
690 if (!printed_something
)
694 void __symbol_put(const char *symbol
)
696 struct module
*owner
;
698 const unsigned long *crc
;
700 spin_lock_irqsave(&modlist_lock
, flags
);
701 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
704 spin_unlock_irqrestore(&modlist_lock
, flags
);
706 EXPORT_SYMBOL(__symbol_put
);
708 void symbol_put_addr(void *addr
)
710 struct module
*modaddr
;
712 if (core_kernel_text((unsigned long)addr
))
715 if (!(modaddr
= module_text_address((unsigned long)addr
)))
719 EXPORT_SYMBOL_GPL(symbol_put_addr
);
721 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
722 struct module
*mod
, char *buffer
)
724 /* sysfs holds a reference */
725 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
728 static struct module_attribute refcnt
= {
729 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
733 #else /* !CONFIG_MODULE_UNLOAD */
734 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
736 /* We don't know the usage count, or what modules are using. */
737 seq_printf(m
, " - -");
740 static inline void module_unload_free(struct module
*mod
)
744 static inline int use_module(struct module
*a
, struct module
*b
)
746 return strong_try_module_get(b
);
749 static inline void module_unload_init(struct module
*mod
)
752 #endif /* CONFIG_MODULE_UNLOAD */
754 static struct module_attribute
*modinfo_attrs
[] = {
757 #ifdef CONFIG_MODULE_UNLOAD
763 static const char vermagic
[] = VERMAGIC_STRING
;
765 #ifdef CONFIG_MODVERSIONS
766 static int check_version(Elf_Shdr
*sechdrs
,
767 unsigned int versindex
,
770 const unsigned long *crc
)
772 unsigned int i
, num_versions
;
773 struct modversion_info
*versions
;
775 /* Exporting module didn't supply crcs? OK, we're already tainted. */
779 versions
= (void *) sechdrs
[versindex
].sh_addr
;
780 num_versions
= sechdrs
[versindex
].sh_size
781 / sizeof(struct modversion_info
);
783 for (i
= 0; i
< num_versions
; i
++) {
784 if (strcmp(versions
[i
].name
, symname
) != 0)
787 if (versions
[i
].crc
== *crc
)
789 printk("%s: disagrees about version of symbol %s\n",
791 DEBUGP("Found checksum %lX vs module %lX\n",
792 *crc
, versions
[i
].crc
);
795 /* Not in module's version table. OK, but that taints the kernel. */
796 if (!(tainted
& TAINT_FORCED_MODULE
)) {
797 printk("%s: no version for \"%s\" found: kernel tainted.\n",
799 add_taint(TAINT_FORCED_MODULE
);
804 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
805 unsigned int versindex
,
808 const unsigned long *crc
;
809 struct module
*owner
;
811 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
813 return check_version(sechdrs
, versindex
, "struct_module", mod
,
817 /* First part is kernel version, which we ignore. */
818 static inline int same_magic(const char *amagic
, const char *bmagic
)
820 amagic
+= strcspn(amagic
, " ");
821 bmagic
+= strcspn(bmagic
, " ");
822 return strcmp(amagic
, bmagic
) == 0;
825 static inline int check_version(Elf_Shdr
*sechdrs
,
826 unsigned int versindex
,
829 const unsigned long *crc
)
834 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
835 unsigned int versindex
,
841 static inline int same_magic(const char *amagic
, const char *bmagic
)
843 return strcmp(amagic
, bmagic
) == 0;
845 #endif /* CONFIG_MODVERSIONS */
847 /* Resolve a symbol for this module. I.e. if we find one, record usage.
848 Must be holding module_mutex. */
849 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
850 unsigned int versindex
,
854 struct module
*owner
;
856 const unsigned long *crc
;
858 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
860 /* use_module can fail due to OOM, or module unloading */
861 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
862 !use_module(mod
, owner
))
870 * /sys/module/foo/sections stuff
871 * J. Corbet <corbet@lwn.net>
873 #ifdef CONFIG_KALLSYMS
874 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
875 struct module
*mod
, char *buf
)
877 struct module_sect_attr
*sattr
=
878 container_of(mattr
, struct module_sect_attr
, mattr
);
879 return sprintf(buf
, "0x%lx\n", sattr
->address
);
882 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
883 char *secstrings
, Elf_Shdr
*sechdrs
)
885 unsigned int nloaded
= 0, i
, size
[2];
886 struct module_sect_attrs
*sect_attrs
;
887 struct module_sect_attr
*sattr
;
888 struct attribute
**gattr
;
890 /* Count loaded sections and allocate structures */
891 for (i
= 0; i
< nsect
; i
++)
892 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
894 size
[0] = ALIGN(sizeof(*sect_attrs
)
895 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
896 sizeof(sect_attrs
->grp
.attrs
[0]));
897 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
898 if (! (sect_attrs
= kmalloc(size
[0] + size
[1], GFP_KERNEL
)))
901 /* Setup section attributes. */
902 sect_attrs
->grp
.name
= "sections";
903 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
905 sattr
= §_attrs
->attrs
[0];
906 gattr
= §_attrs
->grp
.attrs
[0];
907 for (i
= 0; i
< nsect
; i
++) {
908 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
910 sattr
->address
= sechdrs
[i
].sh_addr
;
911 strlcpy(sattr
->name
, secstrings
+ sechdrs
[i
].sh_name
,
912 MODULE_SECT_NAME_LEN
);
913 sattr
->mattr
.show
= module_sect_show
;
914 sattr
->mattr
.store
= NULL
;
915 sattr
->mattr
.attr
.name
= sattr
->name
;
916 sattr
->mattr
.attr
.owner
= mod
;
917 sattr
->mattr
.attr
.mode
= S_IRUGO
;
918 *(gattr
++) = &(sattr
++)->mattr
.attr
;
922 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
925 mod
->sect_attrs
= sect_attrs
;
931 static void remove_sect_attrs(struct module
*mod
)
933 if (mod
->sect_attrs
) {
934 sysfs_remove_group(&mod
->mkobj
.kobj
,
935 &mod
->sect_attrs
->grp
);
936 /* We are positive that no one is using any sect attrs
937 * at this point. Deallocate immediately. */
938 kfree(mod
->sect_attrs
);
939 mod
->sect_attrs
= NULL
;
945 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
946 char *sectstrings
, Elf_Shdr
*sechdrs
)
950 static inline void remove_sect_attrs(struct module
*mod
)
953 #endif /* CONFIG_KALLSYMS */
955 static int module_add_modinfo_attrs(struct module
*mod
)
957 struct module_attribute
*attr
;
958 struct module_attribute
*temp_attr
;
962 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
963 (ARRAY_SIZE(modinfo_attrs
) + 1)),
965 if (!mod
->modinfo_attrs
)
968 temp_attr
= mod
->modinfo_attrs
;
969 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
971 (attr
->test
&& attr
->test(mod
))) {
972 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
973 temp_attr
->attr
.owner
= mod
;
974 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
981 static void module_remove_modinfo_attrs(struct module
*mod
)
983 struct module_attribute
*attr
;
986 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
987 /* pick a field to test for end of list */
988 if (!attr
->attr
.name
)
990 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
994 kfree(mod
->modinfo_attrs
);
997 static int mod_sysfs_setup(struct module
*mod
,
998 struct kernel_param
*kparam
,
999 unsigned int num_params
)
1003 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1004 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1007 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1008 mod
->mkobj
.mod
= mod
;
1009 err
= kobject_register(&mod
->mkobj
.kobj
);
1013 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1017 err
= module_add_modinfo_attrs(mod
);
1024 kobject_unregister(&mod
->mkobj
.kobj
);
1029 static void mod_kobject_remove(struct module
*mod
)
1031 module_remove_modinfo_attrs(mod
);
1032 module_param_sysfs_remove(mod
);
1034 kobject_unregister(&mod
->mkobj
.kobj
);
1038 * unlink the module with the whole machine is stopped with interrupts off
1039 * - this defends against kallsyms not taking locks
1041 static int __unlink_module(void *_mod
)
1043 struct module
*mod
= _mod
;
1044 list_del(&mod
->list
);
1048 /* Free a module, remove from lists, etc (must hold module mutex). */
1049 static void free_module(struct module
*mod
)
1051 /* Delete from various lists */
1052 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1053 remove_sect_attrs(mod
);
1054 mod_kobject_remove(mod
);
1056 unwind_remove_table(mod
->unwind_info
, 0);
1058 /* Arch-specific cleanup. */
1059 module_arch_cleanup(mod
);
1061 /* Module unload stuff */
1062 module_unload_free(mod
);
1064 /* This may be NULL, but that's OK */
1065 module_free(mod
, mod
->module_init
);
1068 percpu_modfree(mod
->percpu
);
1070 /* Finally, free the core (containing the module structure) */
1071 module_free(mod
, mod
->module_core
);
1074 void *__symbol_get(const char *symbol
)
1076 struct module
*owner
;
1077 unsigned long value
, flags
;
1078 const unsigned long *crc
;
1080 spin_lock_irqsave(&modlist_lock
, flags
);
1081 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1082 if (value
&& !strong_try_module_get(owner
))
1084 spin_unlock_irqrestore(&modlist_lock
, flags
);
1086 return (void *)value
;
1088 EXPORT_SYMBOL_GPL(__symbol_get
);
1091 * Ensure that an exported symbol [global namespace] does not already exist
1092 * in the Kernel or in some other modules exported symbol table.
1094 static int verify_export_symbols(struct module
*mod
)
1096 const char *name
= NULL
;
1097 unsigned long i
, ret
= 0;
1098 struct module
*owner
;
1099 const unsigned long *crc
;
1101 for (i
= 0; i
< mod
->num_syms
; i
++)
1102 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1103 name
= mod
->syms
[i
].name
;
1108 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1109 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1110 name
= mod
->gpl_syms
[i
].name
;
1117 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1118 mod
->name
, name
, module_name(owner
));
1123 /* Change all symbols so that sh_value encodes the pointer directly. */
1124 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1125 unsigned int symindex
,
1127 unsigned int versindex
,
1128 unsigned int pcpuindex
,
1131 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1132 unsigned long secbase
;
1133 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1136 for (i
= 1; i
< n
; i
++) {
1137 switch (sym
[i
].st_shndx
) {
1139 /* We compiled with -fno-common. These are not
1140 supposed to happen. */
1141 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1142 printk("%s: please compile with -fno-common\n",
1148 /* Don't need to do anything */
1149 DEBUGP("Absolute symbol: 0x%08lx\n",
1150 (long)sym
[i
].st_value
);
1155 = resolve_symbol(sechdrs
, versindex
,
1156 strtab
+ sym
[i
].st_name
, mod
);
1158 /* Ok if resolved. */
1159 if (sym
[i
].st_value
!= 0)
1162 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1165 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1166 mod
->name
, strtab
+ sym
[i
].st_name
);
1171 /* Divert to percpu allocation if a percpu var. */
1172 if (sym
[i
].st_shndx
== pcpuindex
)
1173 secbase
= (unsigned long)mod
->percpu
;
1175 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1176 sym
[i
].st_value
+= secbase
;
1184 /* Update size with this section: return offset. */
1185 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1189 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1190 *size
= ret
+ sechdr
->sh_size
;
1194 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1195 might -- code, read-only data, read-write data, small data. Tally
1196 sizes, and place the offsets into sh_entsize fields: high bit means it
1198 static void layout_sections(struct module
*mod
,
1199 const Elf_Ehdr
*hdr
,
1201 const char *secstrings
)
1203 static unsigned long const masks
[][2] = {
1204 /* NOTE: all executable code must be the first section
1205 * in this array; otherwise modify the text_size
1206 * finder in the two loops below */
1207 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1208 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1209 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1210 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1214 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1215 sechdrs
[i
].sh_entsize
= ~0UL;
1217 DEBUGP("Core section allocation order:\n");
1218 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1219 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1220 Elf_Shdr
*s
= &sechdrs
[i
];
1222 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1223 || (s
->sh_flags
& masks
[m
][1])
1224 || s
->sh_entsize
!= ~0UL
1225 || strncmp(secstrings
+ s
->sh_name
,
1228 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1229 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1232 mod
->core_text_size
= mod
->core_size
;
1235 DEBUGP("Init section allocation order:\n");
1236 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1237 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1238 Elf_Shdr
*s
= &sechdrs
[i
];
1240 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1241 || (s
->sh_flags
& masks
[m
][1])
1242 || s
->sh_entsize
!= ~0UL
1243 || strncmp(secstrings
+ s
->sh_name
,
1246 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1247 | INIT_OFFSET_MASK
);
1248 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1251 mod
->init_text_size
= mod
->init_size
;
1255 static void set_license(struct module
*mod
, const char *license
)
1258 license
= "unspecified";
1260 mod
->license_gplok
= license_is_gpl_compatible(license
);
1261 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1262 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1263 mod
->name
, license
);
1264 add_taint(TAINT_PROPRIETARY_MODULE
);
1268 /* Parse tag=value strings from .modinfo section */
1269 static char *next_string(char *string
, unsigned long *secsize
)
1271 /* Skip non-zero chars */
1274 if ((*secsize
)-- <= 1)
1278 /* Skip any zero padding. */
1279 while (!string
[0]) {
1281 if ((*secsize
)-- <= 1)
1287 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1292 unsigned int taglen
= strlen(tag
);
1293 unsigned long size
= sechdrs
[info
].sh_size
;
1295 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1296 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1297 return p
+ taglen
+ 1;
1302 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1303 unsigned int infoindex
)
1305 struct module_attribute
*attr
;
1308 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1311 get_modinfo(sechdrs
,
1317 #ifdef CONFIG_KALLSYMS
1318 int is_exported(const char *name
, const struct module
*mod
)
1320 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1323 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1330 static char elf_type(const Elf_Sym
*sym
,
1332 const char *secstrings
,
1335 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1336 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1341 if (sym
->st_shndx
== SHN_UNDEF
)
1343 if (sym
->st_shndx
== SHN_ABS
)
1345 if (sym
->st_shndx
>= SHN_LORESERVE
)
1347 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1349 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1350 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1351 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1353 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1358 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1359 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1364 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1365 ".debug", strlen(".debug")) == 0)
1370 static void add_kallsyms(struct module
*mod
,
1372 unsigned int symindex
,
1373 unsigned int strindex
,
1374 const char *secstrings
)
1378 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1379 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1380 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1382 /* Set types up while we still have access to sections. */
1383 for (i
= 0; i
< mod
->num_symtab
; i
++)
1384 mod
->symtab
[i
].st_info
1385 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1388 static inline void add_kallsyms(struct module
*mod
,
1390 unsigned int symindex
,
1391 unsigned int strindex
,
1392 const char *secstrings
)
1395 #endif /* CONFIG_KALLSYMS */
1397 /* Allocate and load the module: note that size of section 0 is always
1398 zero, and we rely on this for optional sections. */
1399 static struct module
*load_module(void __user
*umod
,
1401 const char __user
*uargs
)
1405 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1406 unsigned int i
, symindex
= 0, strindex
= 0, setupindex
, exindex
,
1407 exportindex
, modindex
, obsparmindex
, infoindex
, gplindex
,
1408 crcindex
, gplcrcindex
, versindex
, pcpuindex
, gplfutureindex
,
1409 gplfuturecrcindex
, unwindex
= 0;
1412 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1413 struct exception_table_entry
*extable
;
1414 mm_segment_t old_fs
;
1416 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1418 if (len
< sizeof(*hdr
))
1419 return ERR_PTR(-ENOEXEC
);
1421 /* Suck in entire file: we'll want most of it. */
1422 /* vmalloc barfs on "unusual" numbers. Check here */
1423 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1424 return ERR_PTR(-ENOMEM
);
1425 if (copy_from_user(hdr
, umod
, len
) != 0) {
1430 /* Sanity checks against insmoding binaries or wrong arch,
1431 weird elf version */
1432 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1433 || hdr
->e_type
!= ET_REL
1434 || !elf_check_arch(hdr
)
1435 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1440 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1443 /* Convenience variables */
1444 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1445 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1446 sechdrs
[0].sh_addr
= 0;
1448 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1449 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1450 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1453 /* Mark all sections sh_addr with their address in the
1455 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1457 /* Internal symbols and strings. */
1458 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1460 strindex
= sechdrs
[i
].sh_link
;
1461 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1463 #ifndef CONFIG_MODULE_UNLOAD
1464 /* Don't load .exit sections */
1465 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1466 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1470 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1471 ".gnu.linkonce.this_module");
1473 printk(KERN_WARNING
"No module found in object\n");
1477 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1479 if (symindex
== 0) {
1480 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1486 /* Optional sections */
1487 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1488 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1489 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1490 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1491 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1492 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1493 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1494 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1495 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1496 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1497 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1498 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1499 #ifdef ARCH_UNWIND_SECTION_NAME
1500 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1503 /* Don't keep modinfo section */
1504 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1505 #ifdef CONFIG_KALLSYMS
1506 /* Keep symbol and string tables for decoding later. */
1507 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1508 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1511 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1513 /* Check module struct version now, before we try to use module. */
1514 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1519 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1520 /* This is allowed: modprobe --force will invalidate it. */
1522 add_taint(TAINT_FORCED_MODULE
);
1523 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1525 } else if (!same_magic(modmagic
, vermagic
)) {
1526 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1527 mod
->name
, modmagic
, vermagic
);
1532 /* Now copy in args */
1533 args
= strndup_user(uargs
, ~0UL >> 1);
1535 err
= PTR_ERR(args
);
1539 if (find_module(mod
->name
)) {
1544 mod
->state
= MODULE_STATE_COMING
;
1546 /* Allow arches to frob section contents and sizes. */
1547 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1552 /* We have a special allocation for this section. */
1553 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1554 sechdrs
[pcpuindex
].sh_addralign
,
1560 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1561 mod
->percpu
= percpu
;
1564 /* Determine total sizes, and put offsets in sh_entsize. For now
1565 this is done generically; there doesn't appear to be any
1566 special cases for the architectures. */
1567 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1569 /* Do the allocs. */
1570 ptr
= module_alloc(mod
->core_size
);
1575 memset(ptr
, 0, mod
->core_size
);
1576 mod
->module_core
= ptr
;
1578 ptr
= module_alloc(mod
->init_size
);
1579 if (!ptr
&& mod
->init_size
) {
1583 memset(ptr
, 0, mod
->init_size
);
1584 mod
->module_init
= ptr
;
1586 /* Transfer each section which specifies SHF_ALLOC */
1587 DEBUGP("final section addresses:\n");
1588 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1591 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1594 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1595 dest
= mod
->module_init
1596 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1598 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1600 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1601 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1602 sechdrs
[i
].sh_size
);
1603 /* Update sh_addr to point to copy in image. */
1604 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1605 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1607 /* Module has been moved. */
1608 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1610 /* Now we've moved module, initialize linked lists, etc. */
1611 module_unload_init(mod
);
1613 /* Set up license info based on the info section */
1614 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1616 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1617 add_taint(TAINT_PROPRIETARY_MODULE
);
1618 if (strcmp(mod
->name
, "driverloader") == 0)
1619 add_taint(TAINT_PROPRIETARY_MODULE
);
1621 /* Set up MODINFO_ATTR fields */
1622 setup_modinfo(mod
, sechdrs
, infoindex
);
1624 /* Fix up syms, so that st_value is a pointer to location. */
1625 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1630 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1631 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1632 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1634 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1635 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1636 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1638 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1639 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1640 sizeof(*mod
->gpl_future_syms
);
1641 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1642 if (gplfuturecrcindex
)
1643 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1645 #ifdef CONFIG_MODVERSIONS
1646 if ((mod
->num_syms
&& !crcindex
) ||
1647 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1648 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
)) {
1649 printk(KERN_WARNING
"%s: No versions for exported symbols."
1650 " Tainting kernel.\n", mod
->name
);
1651 add_taint(TAINT_FORCED_MODULE
);
1655 /* Now do relocations. */
1656 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1657 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1658 unsigned int info
= sechdrs
[i
].sh_info
;
1660 /* Not a valid relocation section? */
1661 if (info
>= hdr
->e_shnum
)
1664 /* Don't bother with non-allocated sections */
1665 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1668 if (sechdrs
[i
].sh_type
== SHT_REL
)
1669 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1670 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1671 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1677 /* Find duplicate symbols */
1678 err
= verify_export_symbols(mod
);
1683 /* Set up and sort exception table */
1684 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1685 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1686 sort_extable(extable
, extable
+ mod
->num_exentries
);
1688 /* Finally, copy percpu area over. */
1689 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1690 sechdrs
[pcpuindex
].sh_size
);
1692 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1694 err
= module_finalize(hdr
, sechdrs
, mod
);
1698 /* flush the icache in correct context */
1703 * Flush the instruction cache, since we've played with text.
1704 * Do it before processing of module parameters, so the module
1705 * can provide parameter accessor functions of its own.
1707 if (mod
->module_init
)
1708 flush_icache_range((unsigned long)mod
->module_init
,
1709 (unsigned long)mod
->module_init
1711 flush_icache_range((unsigned long)mod
->module_core
,
1712 (unsigned long)mod
->module_core
+ mod
->core_size
);
1718 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
1721 /* Size of section 0 is 0, so this works well if no params */
1722 err
= parse_args(mod
->name
, mod
->args
,
1723 (struct kernel_param
*)
1724 sechdrs
[setupindex
].sh_addr
,
1725 sechdrs
[setupindex
].sh_size
1726 / sizeof(struct kernel_param
),
1731 err
= mod_sysfs_setup(mod
,
1732 (struct kernel_param
*)
1733 sechdrs
[setupindex
].sh_addr
,
1734 sechdrs
[setupindex
].sh_size
1735 / sizeof(struct kernel_param
));
1738 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1740 /* Size of section 0 is 0, so this works well if no unwind info. */
1741 mod
->unwind_info
= unwind_add_table(mod
,
1742 (void *)sechdrs
[unwindex
].sh_addr
,
1743 sechdrs
[unwindex
].sh_size
);
1745 /* Get rid of temporary copy */
1752 module_arch_cleanup(mod
);
1754 module_unload_free(mod
);
1755 module_free(mod
, mod
->module_init
);
1757 module_free(mod
, mod
->module_core
);
1760 percpu_modfree(percpu
);
1765 return ERR_PTR(err
);
1768 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1774 * link the module with the whole machine is stopped with interrupts off
1775 * - this defends against kallsyms not taking locks
1777 static int __link_module(void *_mod
)
1779 struct module
*mod
= _mod
;
1780 list_add(&mod
->list
, &modules
);
1784 /* This is where the real work happens */
1786 sys_init_module(void __user
*umod
,
1788 const char __user
*uargs
)
1793 /* Must have permission */
1794 if (!capable(CAP_SYS_MODULE
))
1797 /* Only one module load at a time, please */
1798 if (mutex_lock_interruptible(&module_mutex
) != 0)
1801 /* Do all the hard work */
1802 mod
= load_module(umod
, len
, uargs
);
1804 mutex_unlock(&module_mutex
);
1805 return PTR_ERR(mod
);
1808 /* Now sew it into the lists. They won't access us, since
1809 strong_try_module_get() will fail. */
1810 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1812 /* Drop lock so they can recurse */
1813 mutex_unlock(&module_mutex
);
1815 blocking_notifier_call_chain(&module_notify_list
,
1816 MODULE_STATE_COMING
, mod
);
1818 /* Start the module */
1819 if (mod
->init
!= NULL
)
1822 /* Init routine failed: abort. Try to protect us from
1823 buggy refcounters. */
1824 mod
->state
= MODULE_STATE_GOING
;
1825 synchronize_sched();
1827 printk(KERN_ERR
"%s: module is now stuck!\n",
1831 mutex_lock(&module_mutex
);
1833 mutex_unlock(&module_mutex
);
1838 /* Now it's a first class citizen! */
1839 mutex_lock(&module_mutex
);
1840 mod
->state
= MODULE_STATE_LIVE
;
1841 /* Drop initial reference. */
1843 unwind_remove_table(mod
->unwind_info
, 1);
1844 module_free(mod
, mod
->module_init
);
1845 mod
->module_init
= NULL
;
1847 mod
->init_text_size
= 0;
1848 mutex_unlock(&module_mutex
);
1853 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
1855 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
1858 #ifdef CONFIG_KALLSYMS
1860 * This ignores the intensely annoying "mapping symbols" found
1861 * in ARM ELF files: $a, $t and $d.
1863 static inline int is_arm_mapping_symbol(const char *str
)
1865 return str
[0] == '$' && strchr("atd", str
[1])
1866 && (str
[2] == '\0' || str
[2] == '.');
1869 static const char *get_ksymbol(struct module
*mod
,
1871 unsigned long *size
,
1872 unsigned long *offset
)
1874 unsigned int i
, best
= 0;
1875 unsigned long nextval
;
1877 /* At worse, next value is at end of module */
1878 if (within(addr
, mod
->module_init
, mod
->init_size
))
1879 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
1881 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
1883 /* Scan for closest preceeding symbol, and next symbol. (ELF
1884 starts real symbols at 1). */
1885 for (i
= 1; i
< mod
->num_symtab
; i
++) {
1886 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
1889 /* We ignore unnamed symbols: they're uninformative
1890 * and inserted at a whim. */
1891 if (mod
->symtab
[i
].st_value
<= addr
1892 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
1893 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1894 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1896 if (mod
->symtab
[i
].st_value
> addr
1897 && mod
->symtab
[i
].st_value
< nextval
1898 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1899 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1900 nextval
= mod
->symtab
[i
].st_value
;
1906 *size
= nextval
- mod
->symtab
[best
].st_value
;
1907 *offset
= addr
- mod
->symtab
[best
].st_value
;
1908 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
1911 /* For kallsyms to ask for address resolution. NULL means not found.
1912 We don't lock, as this is used for oops resolution and races are a
1914 const char *module_address_lookup(unsigned long addr
,
1915 unsigned long *size
,
1916 unsigned long *offset
,
1921 list_for_each_entry(mod
, &modules
, list
) {
1922 if (within(addr
, mod
->module_init
, mod
->init_size
)
1923 || within(addr
, mod
->module_core
, mod
->core_size
)) {
1924 *modname
= mod
->name
;
1925 return get_ksymbol(mod
, addr
, size
, offset
);
1931 struct module
*module_get_kallsym(unsigned int symnum
,
1932 unsigned long *value
,
1938 mutex_lock(&module_mutex
);
1939 list_for_each_entry(mod
, &modules
, list
) {
1940 if (symnum
< mod
->num_symtab
) {
1941 *value
= mod
->symtab
[symnum
].st_value
;
1942 *type
= mod
->symtab
[symnum
].st_info
;
1944 mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
1946 mutex_unlock(&module_mutex
);
1949 symnum
-= mod
->num_symtab
;
1951 mutex_unlock(&module_mutex
);
1955 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
1959 for (i
= 0; i
< mod
->num_symtab
; i
++)
1960 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
1961 mod
->symtab
[i
].st_info
!= 'U')
1962 return mod
->symtab
[i
].st_value
;
1966 /* Look for this name: can be of form module:name. */
1967 unsigned long module_kallsyms_lookup_name(const char *name
)
1971 unsigned long ret
= 0;
1973 /* Don't lock: we're in enough trouble already. */
1974 if ((colon
= strchr(name
, ':')) != NULL
) {
1976 if ((mod
= find_module(name
)) != NULL
)
1977 ret
= mod_find_symname(mod
, colon
+1);
1980 list_for_each_entry(mod
, &modules
, list
)
1981 if ((ret
= mod_find_symname(mod
, name
)) != 0)
1986 #endif /* CONFIG_KALLSYMS */
1988 /* Called by the /proc file system to return a list of modules. */
1989 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
1991 struct list_head
*i
;
1994 mutex_lock(&module_mutex
);
1995 list_for_each(i
, &modules
) {
2004 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2006 struct list_head
*i
= p
;
2008 if (i
->next
== &modules
)
2013 static void m_stop(struct seq_file
*m
, void *p
)
2015 mutex_unlock(&module_mutex
);
2018 static int m_show(struct seq_file
*m
, void *p
)
2020 struct module
*mod
= list_entry(p
, struct module
, list
);
2021 seq_printf(m
, "%s %lu",
2022 mod
->name
, mod
->init_size
+ mod
->core_size
);
2023 print_unload_info(m
, mod
);
2025 /* Informative for users. */
2026 seq_printf(m
, " %s",
2027 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2028 mod
->state
== MODULE_STATE_COMING
? "Loading":
2030 /* Used by oprofile and other similar tools. */
2031 seq_printf(m
, " 0x%p", mod
->module_core
);
2033 seq_printf(m
, "\n");
2037 /* Format: modulename size refcount deps address
2039 Where refcount is a number or -, and deps is a comma-separated list
2042 struct seq_operations modules_op
= {
2049 /* Given an address, look for it in the module exception tables. */
2050 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2052 unsigned long flags
;
2053 const struct exception_table_entry
*e
= NULL
;
2056 spin_lock_irqsave(&modlist_lock
, flags
);
2057 list_for_each_entry(mod
, &modules
, list
) {
2058 if (mod
->num_exentries
== 0)
2061 e
= search_extable(mod
->extable
,
2062 mod
->extable
+ mod
->num_exentries
- 1,
2067 spin_unlock_irqrestore(&modlist_lock
, flags
);
2069 /* Now, if we found one, we are running inside it now, hence
2070 we cannot unload the module, hence no refcnt needed. */
2074 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2075 struct module
*__module_text_address(unsigned long addr
)
2079 list_for_each_entry(mod
, &modules
, list
)
2080 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2081 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2086 struct module
*module_text_address(unsigned long addr
)
2089 unsigned long flags
;
2091 spin_lock_irqsave(&modlist_lock
, flags
);
2092 mod
= __module_text_address(addr
);
2093 spin_unlock_irqrestore(&modlist_lock
, flags
);
2098 /* Don't grab lock, we're oopsing. */
2099 void print_modules(void)
2103 printk("Modules linked in:");
2104 list_for_each_entry(mod
, &modules
, list
)
2105 printk(" %s", mod
->name
);
2109 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2114 /* Don't check return code; this call is idempotent */
2115 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2117 EXPORT_SYMBOL(module_add_driver
);
2119 void module_remove_driver(struct device_driver
*drv
)
2123 sysfs_remove_link(&drv
->kobj
, "module");
2125 EXPORT_SYMBOL(module_remove_driver
);
2127 #ifdef CONFIG_MODVERSIONS
2128 /* Generate the signature for struct module here, too, for modversions. */
2129 void struct_module(struct module
*mod
) { return; }
2130 EXPORT_SYMBOL(struct_module
);