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 struct kernel_symbol __start___ksymtab_unused
[];
126 extern const struct kernel_symbol __stop___ksymtab_unused
[];
127 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
128 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
129 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
130 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
131 extern const unsigned long __start___kcrctab
[];
132 extern const unsigned long __start___kcrctab_gpl
[];
133 extern const unsigned long __start___kcrctab_gpl_future
[];
134 extern const unsigned long __start___kcrctab_unused
[];
135 extern const unsigned long __start___kcrctab_unused_gpl
[];
137 #ifndef CONFIG_MODVERSIONS
138 #define symversion(base, idx) NULL
140 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
143 /* lookup symbol in given range of kernel_symbols */
144 static const struct kernel_symbol
*lookup_symbol(const char *name
,
145 const struct kernel_symbol
*start
,
146 const struct kernel_symbol
*stop
)
148 const struct kernel_symbol
*ks
= start
;
149 for (; ks
< stop
; ks
++)
150 if (strcmp(ks
->name
, name
) == 0)
155 static void printk_unused_warning(const char *name
)
157 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
158 "however this module is using it.\n", name
);
159 printk(KERN_WARNING
"This symbol will go away in the future.\n");
160 printk(KERN_WARNING
"Please evalute if this is the right api to use, "
161 "and if it really is, submit a report the linux kernel "
162 "mailinglist together with submitting your code for "
166 /* Find a symbol, return value, crc and module which owns it */
167 static unsigned long __find_symbol(const char *name
,
168 struct module
**owner
,
169 const unsigned long **crc
,
173 const struct kernel_symbol
*ks
;
175 /* Core kernel first. */
177 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
179 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
183 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
184 __stop___ksymtab_gpl
);
186 *crc
= symversion(__start___kcrctab_gpl
,
187 (ks
- __start___ksymtab_gpl
));
191 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
192 __stop___ksymtab_gpl_future
);
195 printk(KERN_WARNING
"Symbol %s is being used "
196 "by a non-GPL module, which will not "
197 "be allowed in the future\n", name
);
198 printk(KERN_WARNING
"Please see the file "
199 "Documentation/feature-removal-schedule.txt "
200 "in the kernel source tree for more "
203 *crc
= symversion(__start___kcrctab_gpl_future
,
204 (ks
- __start___ksymtab_gpl_future
));
208 ks
= lookup_symbol(name
, __start___ksymtab_unused
,
209 __stop___ksymtab_unused
);
211 printk_unused_warning(name
);
212 *crc
= symversion(__start___kcrctab_unused
,
213 (ks
- __start___ksymtab_unused
));
218 ks
= lookup_symbol(name
, __start___ksymtab_unused_gpl
,
219 __stop___ksymtab_unused_gpl
);
221 printk_unused_warning(name
);
222 *crc
= symversion(__start___kcrctab_unused_gpl
,
223 (ks
- __start___ksymtab_unused_gpl
));
227 /* Now try modules. */
228 list_for_each_entry(mod
, &modules
, list
) {
230 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
232 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
237 ks
= lookup_symbol(name
, mod
->gpl_syms
,
238 mod
->gpl_syms
+ mod
->num_gpl_syms
);
240 *crc
= symversion(mod
->gpl_crcs
,
241 (ks
- mod
->gpl_syms
));
245 ks
= lookup_symbol(name
, mod
->unused_syms
, mod
->unused_syms
+ mod
->num_unused_syms
);
247 printk_unused_warning(name
);
248 *crc
= symversion(mod
->unused_crcs
, (ks
- mod
->unused_syms
));
253 ks
= lookup_symbol(name
, mod
->unused_gpl_syms
,
254 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
);
256 printk_unused_warning(name
);
257 *crc
= symversion(mod
->unused_gpl_crcs
,
258 (ks
- mod
->unused_gpl_syms
));
262 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
263 (mod
->gpl_future_syms
+
264 mod
->num_gpl_future_syms
));
267 printk(KERN_WARNING
"Symbol %s is being used "
268 "by a non-GPL module, which will not "
269 "be allowed in the future\n", name
);
270 printk(KERN_WARNING
"Please see the file "
271 "Documentation/feature-removal-schedule.txt "
272 "in the kernel source tree for more "
275 *crc
= symversion(mod
->gpl_future_crcs
,
276 (ks
- mod
->gpl_future_syms
));
280 DEBUGP("Failed to find symbol %s\n", name
);
284 /* Search for module by name: must hold module_mutex. */
285 static struct module
*find_module(const char *name
)
289 list_for_each_entry(mod
, &modules
, list
) {
290 if (strcmp(mod
->name
, name
) == 0)
297 /* Number of blocks used and allocated. */
298 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
299 /* Size of each block. -ve means used. */
300 static int *pcpu_size
;
302 static int split_block(unsigned int i
, unsigned short size
)
304 /* Reallocation required? */
305 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
306 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
311 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
312 pcpu_num_allocated
*= 2;
317 /* Insert a new subblock */
318 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
319 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
322 pcpu_size
[i
+1] -= size
;
327 static inline unsigned int block_size(int val
)
334 /* Created by linker magic */
335 extern char __per_cpu_start
[], __per_cpu_end
[];
337 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
344 if (align
> SMP_CACHE_BYTES
) {
345 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
346 name
, align
, SMP_CACHE_BYTES
);
347 align
= SMP_CACHE_BYTES
;
350 ptr
= __per_cpu_start
;
351 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
352 /* Extra for alignment requirement. */
353 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
354 BUG_ON(i
== 0 && extra
!= 0);
356 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
359 /* Transfer extra to previous block. */
360 if (pcpu_size
[i
-1] < 0)
361 pcpu_size
[i
-1] -= extra
;
363 pcpu_size
[i
-1] += extra
;
364 pcpu_size
[i
] -= extra
;
367 /* Split block if warranted */
368 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
369 if (!split_block(i
, size
))
373 pcpu_size
[i
] = -pcpu_size
[i
];
377 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
382 static void percpu_modfree(void *freeme
)
385 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
387 /* First entry is core kernel percpu data. */
388 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
390 pcpu_size
[i
] = -pcpu_size
[i
];
397 /* Merge with previous? */
398 if (pcpu_size
[i
-1] >= 0) {
399 pcpu_size
[i
-1] += pcpu_size
[i
];
401 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
402 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
405 /* Merge with next? */
406 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
407 pcpu_size
[i
] += pcpu_size
[i
+1];
409 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
410 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
414 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
416 const char *secstrings
)
418 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
421 static int percpu_modinit(void)
424 pcpu_num_allocated
= 2;
425 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
427 /* Static in-kernel percpu data (used). */
428 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
430 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
431 if (pcpu_size
[1] < 0) {
432 printk(KERN_ERR
"No per-cpu room for modules.\n");
438 __initcall(percpu_modinit
);
439 #else /* ... !CONFIG_SMP */
440 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
445 static inline void percpu_modfree(void *pcpuptr
)
449 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
451 const char *secstrings
)
455 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
458 /* pcpusec should be 0, and size of that section should be 0. */
461 #endif /* CONFIG_SMP */
463 #define MODINFO_ATTR(field) \
464 static void setup_modinfo_##field(struct module *mod, const char *s) \
466 mod->field = kstrdup(s, GFP_KERNEL); \
468 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
469 struct module *mod, char *buffer) \
471 return sprintf(buffer, "%s\n", mod->field); \
473 static int modinfo_##field##_exists(struct module *mod) \
475 return mod->field != NULL; \
477 static void free_modinfo_##field(struct module *mod) \
482 static struct module_attribute modinfo_##field = { \
483 .attr = { .name = __stringify(field), .mode = 0444, \
484 .owner = THIS_MODULE }, \
485 .show = show_modinfo_##field, \
486 .setup = setup_modinfo_##field, \
487 .test = modinfo_##field##_exists, \
488 .free = free_modinfo_##field, \
491 MODINFO_ATTR(version
);
492 MODINFO_ATTR(srcversion
);
494 #ifdef CONFIG_MODULE_UNLOAD
495 /* Init the unload section of the module. */
496 static void module_unload_init(struct module
*mod
)
500 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
501 for (i
= 0; i
< NR_CPUS
; i
++)
502 local_set(&mod
->ref
[i
].count
, 0);
503 /* Hold reference count during initialization. */
504 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
505 /* Backwards compatibility macros put refcount during init. */
506 mod
->waiter
= current
;
509 /* modules using other modules */
512 struct list_head list
;
513 struct module
*module_which_uses
;
516 /* Does a already use b? */
517 static int already_uses(struct module
*a
, struct module
*b
)
519 struct module_use
*use
;
521 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
522 if (use
->module_which_uses
== a
) {
523 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
527 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
531 /* Module a uses b */
532 static int use_module(struct module
*a
, struct module
*b
)
534 struct module_use
*use
;
535 if (b
== NULL
|| already_uses(a
, b
)) return 1;
537 if (!strong_try_module_get(b
))
540 DEBUGP("Allocating new usage for %s.\n", a
->name
);
541 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
543 printk("%s: out of memory loading\n", a
->name
);
548 use
->module_which_uses
= a
;
549 list_add(&use
->list
, &b
->modules_which_use_me
);
553 /* Clear the unload stuff of the module. */
554 static void module_unload_free(struct module
*mod
)
558 list_for_each_entry(i
, &modules
, list
) {
559 struct module_use
*use
;
561 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
562 if (use
->module_which_uses
== mod
) {
563 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
565 list_del(&use
->list
);
567 /* There can be at most one match. */
574 #ifdef CONFIG_MODULE_FORCE_UNLOAD
575 static inline int try_force_unload(unsigned int flags
)
577 int ret
= (flags
& O_TRUNC
);
579 add_taint(TAINT_FORCED_RMMOD
);
583 static inline int try_force_unload(unsigned int flags
)
587 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
596 /* Whole machine is stopped with interrupts off when this runs. */
597 static int __try_stop_module(void *_sref
)
599 struct stopref
*sref
= _sref
;
601 /* If it's not unused, quit unless we are told to block. */
602 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
603 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
607 /* Mark it as dying. */
608 sref
->mod
->state
= MODULE_STATE_GOING
;
612 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
614 struct stopref sref
= { mod
, flags
, forced
};
616 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
619 unsigned int module_refcount(struct module
*mod
)
621 unsigned int i
, total
= 0;
623 for (i
= 0; i
< NR_CPUS
; i
++)
624 total
+= local_read(&mod
->ref
[i
].count
);
627 EXPORT_SYMBOL(module_refcount
);
629 /* This exists whether we can unload or not */
630 static void free_module(struct module
*mod
);
632 static void wait_for_zero_refcount(struct module
*mod
)
634 /* Since we might sleep for some time, drop the semaphore first */
635 mutex_unlock(&module_mutex
);
637 DEBUGP("Looking at refcount...\n");
638 set_current_state(TASK_UNINTERRUPTIBLE
);
639 if (module_refcount(mod
) == 0)
643 current
->state
= TASK_RUNNING
;
644 mutex_lock(&module_mutex
);
648 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
651 char name
[MODULE_NAME_LEN
];
654 if (!capable(CAP_SYS_MODULE
))
657 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
659 name
[MODULE_NAME_LEN
-1] = '\0';
661 if (mutex_lock_interruptible(&module_mutex
) != 0)
664 mod
= find_module(name
);
670 if (!list_empty(&mod
->modules_which_use_me
)) {
671 /* Other modules depend on us: get rid of them first. */
676 /* Doing init or already dying? */
677 if (mod
->state
!= MODULE_STATE_LIVE
) {
678 /* FIXME: if (force), slam module count and wake up
680 DEBUGP("%s already dying\n", mod
->name
);
685 /* If it has an init func, it must have an exit func to unload */
686 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
688 forced
= try_force_unload(flags
);
690 /* This module can't be removed */
696 /* Set this up before setting mod->state */
697 mod
->waiter
= current
;
699 /* Stop the machine so refcounts can't move and disable module. */
700 ret
= try_stop_module(mod
, flags
, &forced
);
704 /* Never wait if forced. */
705 if (!forced
&& module_refcount(mod
) != 0)
706 wait_for_zero_refcount(mod
);
708 /* Final destruction now noone is using it. */
709 if (mod
->exit
!= NULL
) {
710 mutex_unlock(&module_mutex
);
712 mutex_lock(&module_mutex
);
717 mutex_unlock(&module_mutex
);
721 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
723 struct module_use
*use
;
724 int printed_something
= 0;
726 seq_printf(m
, " %u ", module_refcount(mod
));
728 /* Always include a trailing , so userspace can differentiate
729 between this and the old multi-field proc format. */
730 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
731 printed_something
= 1;
732 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
736 printed_something
= 1;
737 seq_printf(m
, "[unsafe],");
740 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
741 printed_something
= 1;
742 seq_printf(m
, "[permanent],");
745 if (!printed_something
)
749 void __symbol_put(const char *symbol
)
751 struct module
*owner
;
753 const unsigned long *crc
;
755 spin_lock_irqsave(&modlist_lock
, flags
);
756 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
759 spin_unlock_irqrestore(&modlist_lock
, flags
);
761 EXPORT_SYMBOL(__symbol_put
);
763 void symbol_put_addr(void *addr
)
765 struct module
*modaddr
;
767 if (core_kernel_text((unsigned long)addr
))
770 if (!(modaddr
= module_text_address((unsigned long)addr
)))
774 EXPORT_SYMBOL_GPL(symbol_put_addr
);
776 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
777 struct module
*mod
, char *buffer
)
779 /* sysfs holds a reference */
780 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
783 static struct module_attribute refcnt
= {
784 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
788 #else /* !CONFIG_MODULE_UNLOAD */
789 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
791 /* We don't know the usage count, or what modules are using. */
792 seq_printf(m
, " - -");
795 static inline void module_unload_free(struct module
*mod
)
799 static inline int use_module(struct module
*a
, struct module
*b
)
801 return strong_try_module_get(b
);
804 static inline void module_unload_init(struct module
*mod
)
807 #endif /* CONFIG_MODULE_UNLOAD */
809 static struct module_attribute
*modinfo_attrs
[] = {
812 #ifdef CONFIG_MODULE_UNLOAD
818 static const char vermagic
[] = VERMAGIC_STRING
;
820 #ifdef CONFIG_MODVERSIONS
821 static int check_version(Elf_Shdr
*sechdrs
,
822 unsigned int versindex
,
825 const unsigned long *crc
)
827 unsigned int i
, num_versions
;
828 struct modversion_info
*versions
;
830 /* Exporting module didn't supply crcs? OK, we're already tainted. */
834 versions
= (void *) sechdrs
[versindex
].sh_addr
;
835 num_versions
= sechdrs
[versindex
].sh_size
836 / sizeof(struct modversion_info
);
838 for (i
= 0; i
< num_versions
; i
++) {
839 if (strcmp(versions
[i
].name
, symname
) != 0)
842 if (versions
[i
].crc
== *crc
)
844 printk("%s: disagrees about version of symbol %s\n",
846 DEBUGP("Found checksum %lX vs module %lX\n",
847 *crc
, versions
[i
].crc
);
850 /* Not in module's version table. OK, but that taints the kernel. */
851 if (!(tainted
& TAINT_FORCED_MODULE
)) {
852 printk("%s: no version for \"%s\" found: kernel tainted.\n",
854 add_taint(TAINT_FORCED_MODULE
);
859 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
860 unsigned int versindex
,
863 const unsigned long *crc
;
864 struct module
*owner
;
866 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
868 return check_version(sechdrs
, versindex
, "struct_module", mod
,
872 /* First part is kernel version, which we ignore. */
873 static inline int same_magic(const char *amagic
, const char *bmagic
)
875 amagic
+= strcspn(amagic
, " ");
876 bmagic
+= strcspn(bmagic
, " ");
877 return strcmp(amagic
, bmagic
) == 0;
880 static inline int check_version(Elf_Shdr
*sechdrs
,
881 unsigned int versindex
,
884 const unsigned long *crc
)
889 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
890 unsigned int versindex
,
896 static inline int same_magic(const char *amagic
, const char *bmagic
)
898 return strcmp(amagic
, bmagic
) == 0;
900 #endif /* CONFIG_MODVERSIONS */
902 /* Resolve a symbol for this module. I.e. if we find one, record usage.
903 Must be holding module_mutex. */
904 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
905 unsigned int versindex
,
909 struct module
*owner
;
911 const unsigned long *crc
;
913 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
915 /* use_module can fail due to OOM, or module unloading */
916 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
917 !use_module(mod
, owner
))
925 * /sys/module/foo/sections stuff
926 * J. Corbet <corbet@lwn.net>
928 #ifdef CONFIG_KALLSYMS
929 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
930 struct module
*mod
, char *buf
)
932 struct module_sect_attr
*sattr
=
933 container_of(mattr
, struct module_sect_attr
, mattr
);
934 return sprintf(buf
, "0x%lx\n", sattr
->address
);
937 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
938 char *secstrings
, Elf_Shdr
*sechdrs
)
940 unsigned int nloaded
= 0, i
, size
[2];
941 struct module_sect_attrs
*sect_attrs
;
942 struct module_sect_attr
*sattr
;
943 struct attribute
**gattr
;
945 /* Count loaded sections and allocate structures */
946 for (i
= 0; i
< nsect
; i
++)
947 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
949 size
[0] = ALIGN(sizeof(*sect_attrs
)
950 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
951 sizeof(sect_attrs
->grp
.attrs
[0]));
952 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
953 if (! (sect_attrs
= kmalloc(size
[0] + size
[1], GFP_KERNEL
)))
956 /* Setup section attributes. */
957 sect_attrs
->grp
.name
= "sections";
958 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
960 sattr
= §_attrs
->attrs
[0];
961 gattr
= §_attrs
->grp
.attrs
[0];
962 for (i
= 0; i
< nsect
; i
++) {
963 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
965 sattr
->address
= sechdrs
[i
].sh_addr
;
966 strlcpy(sattr
->name
, secstrings
+ sechdrs
[i
].sh_name
,
967 MODULE_SECT_NAME_LEN
);
968 sattr
->mattr
.show
= module_sect_show
;
969 sattr
->mattr
.store
= NULL
;
970 sattr
->mattr
.attr
.name
= sattr
->name
;
971 sattr
->mattr
.attr
.owner
= mod
;
972 sattr
->mattr
.attr
.mode
= S_IRUGO
;
973 *(gattr
++) = &(sattr
++)->mattr
.attr
;
977 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
980 mod
->sect_attrs
= sect_attrs
;
986 static void remove_sect_attrs(struct module
*mod
)
988 if (mod
->sect_attrs
) {
989 sysfs_remove_group(&mod
->mkobj
.kobj
,
990 &mod
->sect_attrs
->grp
);
991 /* We are positive that no one is using any sect attrs
992 * at this point. Deallocate immediately. */
993 kfree(mod
->sect_attrs
);
994 mod
->sect_attrs
= NULL
;
1000 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1001 char *sectstrings
, Elf_Shdr
*sechdrs
)
1005 static inline void remove_sect_attrs(struct module
*mod
)
1008 #endif /* CONFIG_KALLSYMS */
1010 static int module_add_modinfo_attrs(struct module
*mod
)
1012 struct module_attribute
*attr
;
1013 struct module_attribute
*temp_attr
;
1017 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1018 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1020 if (!mod
->modinfo_attrs
)
1023 temp_attr
= mod
->modinfo_attrs
;
1024 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1026 (attr
->test
&& attr
->test(mod
))) {
1027 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1028 temp_attr
->attr
.owner
= mod
;
1029 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1036 static void module_remove_modinfo_attrs(struct module
*mod
)
1038 struct module_attribute
*attr
;
1041 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1042 /* pick a field to test for end of list */
1043 if (!attr
->attr
.name
)
1045 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1049 kfree(mod
->modinfo_attrs
);
1052 static int mod_sysfs_setup(struct module
*mod
,
1053 struct kernel_param
*kparam
,
1054 unsigned int num_params
)
1058 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1059 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1062 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1063 mod
->mkobj
.mod
= mod
;
1064 err
= kobject_register(&mod
->mkobj
.kobj
);
1068 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1072 err
= module_add_modinfo_attrs(mod
);
1079 kobject_unregister(&mod
->mkobj
.kobj
);
1084 static void mod_kobject_remove(struct module
*mod
)
1086 module_remove_modinfo_attrs(mod
);
1087 module_param_sysfs_remove(mod
);
1089 kobject_unregister(&mod
->mkobj
.kobj
);
1093 * unlink the module with the whole machine is stopped with interrupts off
1094 * - this defends against kallsyms not taking locks
1096 static int __unlink_module(void *_mod
)
1098 struct module
*mod
= _mod
;
1099 list_del(&mod
->list
);
1103 /* Free a module, remove from lists, etc (must hold module mutex). */
1104 static void free_module(struct module
*mod
)
1106 /* Delete from various lists */
1107 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1108 remove_sect_attrs(mod
);
1109 mod_kobject_remove(mod
);
1111 unwind_remove_table(mod
->unwind_info
, 0);
1113 /* Arch-specific cleanup. */
1114 module_arch_cleanup(mod
);
1116 /* Module unload stuff */
1117 module_unload_free(mod
);
1119 /* This may be NULL, but that's OK */
1120 module_free(mod
, mod
->module_init
);
1123 percpu_modfree(mod
->percpu
);
1125 /* Finally, free the core (containing the module structure) */
1126 module_free(mod
, mod
->module_core
);
1129 void *__symbol_get(const char *symbol
)
1131 struct module
*owner
;
1132 unsigned long value
, flags
;
1133 const unsigned long *crc
;
1135 spin_lock_irqsave(&modlist_lock
, flags
);
1136 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1137 if (value
&& !strong_try_module_get(owner
))
1139 spin_unlock_irqrestore(&modlist_lock
, flags
);
1141 return (void *)value
;
1143 EXPORT_SYMBOL_GPL(__symbol_get
);
1146 * Ensure that an exported symbol [global namespace] does not already exist
1147 * in the Kernel or in some other modules exported symbol table.
1149 static int verify_export_symbols(struct module
*mod
)
1151 const char *name
= NULL
;
1152 unsigned long i
, ret
= 0;
1153 struct module
*owner
;
1154 const unsigned long *crc
;
1156 for (i
= 0; i
< mod
->num_syms
; i
++)
1157 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1158 name
= mod
->syms
[i
].name
;
1163 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1164 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1165 name
= mod
->gpl_syms
[i
].name
;
1172 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1173 mod
->name
, name
, module_name(owner
));
1178 /* Change all symbols so that sh_value encodes the pointer directly. */
1179 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1180 unsigned int symindex
,
1182 unsigned int versindex
,
1183 unsigned int pcpuindex
,
1186 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1187 unsigned long secbase
;
1188 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1191 for (i
= 1; i
< n
; i
++) {
1192 switch (sym
[i
].st_shndx
) {
1194 /* We compiled with -fno-common. These are not
1195 supposed to happen. */
1196 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1197 printk("%s: please compile with -fno-common\n",
1203 /* Don't need to do anything */
1204 DEBUGP("Absolute symbol: 0x%08lx\n",
1205 (long)sym
[i
].st_value
);
1210 = resolve_symbol(sechdrs
, versindex
,
1211 strtab
+ sym
[i
].st_name
, mod
);
1213 /* Ok if resolved. */
1214 if (sym
[i
].st_value
!= 0)
1217 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1220 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1221 mod
->name
, strtab
+ sym
[i
].st_name
);
1226 /* Divert to percpu allocation if a percpu var. */
1227 if (sym
[i
].st_shndx
== pcpuindex
)
1228 secbase
= (unsigned long)mod
->percpu
;
1230 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1231 sym
[i
].st_value
+= secbase
;
1239 /* Update size with this section: return offset. */
1240 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1244 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1245 *size
= ret
+ sechdr
->sh_size
;
1249 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1250 might -- code, read-only data, read-write data, small data. Tally
1251 sizes, and place the offsets into sh_entsize fields: high bit means it
1253 static void layout_sections(struct module
*mod
,
1254 const Elf_Ehdr
*hdr
,
1256 const char *secstrings
)
1258 static unsigned long const masks
[][2] = {
1259 /* NOTE: all executable code must be the first section
1260 * in this array; otherwise modify the text_size
1261 * finder in the two loops below */
1262 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1263 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1264 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1265 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1269 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1270 sechdrs
[i
].sh_entsize
= ~0UL;
1272 DEBUGP("Core section allocation order:\n");
1273 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1274 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1275 Elf_Shdr
*s
= &sechdrs
[i
];
1277 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1278 || (s
->sh_flags
& masks
[m
][1])
1279 || s
->sh_entsize
!= ~0UL
1280 || strncmp(secstrings
+ s
->sh_name
,
1283 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1284 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1287 mod
->core_text_size
= mod
->core_size
;
1290 DEBUGP("Init section allocation order:\n");
1291 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1292 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1293 Elf_Shdr
*s
= &sechdrs
[i
];
1295 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1296 || (s
->sh_flags
& masks
[m
][1])
1297 || s
->sh_entsize
!= ~0UL
1298 || strncmp(secstrings
+ s
->sh_name
,
1301 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1302 | INIT_OFFSET_MASK
);
1303 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1306 mod
->init_text_size
= mod
->init_size
;
1310 static void set_license(struct module
*mod
, const char *license
)
1313 license
= "unspecified";
1315 mod
->license_gplok
= license_is_gpl_compatible(license
);
1316 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1317 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1318 mod
->name
, license
);
1319 add_taint(TAINT_PROPRIETARY_MODULE
);
1323 /* Parse tag=value strings from .modinfo section */
1324 static char *next_string(char *string
, unsigned long *secsize
)
1326 /* Skip non-zero chars */
1329 if ((*secsize
)-- <= 1)
1333 /* Skip any zero padding. */
1334 while (!string
[0]) {
1336 if ((*secsize
)-- <= 1)
1342 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1347 unsigned int taglen
= strlen(tag
);
1348 unsigned long size
= sechdrs
[info
].sh_size
;
1350 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1351 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1352 return p
+ taglen
+ 1;
1357 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1358 unsigned int infoindex
)
1360 struct module_attribute
*attr
;
1363 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1366 get_modinfo(sechdrs
,
1372 #ifdef CONFIG_KALLSYMS
1373 int is_exported(const char *name
, const struct module
*mod
)
1375 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1378 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1385 static char elf_type(const Elf_Sym
*sym
,
1387 const char *secstrings
,
1390 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1391 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1396 if (sym
->st_shndx
== SHN_UNDEF
)
1398 if (sym
->st_shndx
== SHN_ABS
)
1400 if (sym
->st_shndx
>= SHN_LORESERVE
)
1402 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1404 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1405 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1406 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1408 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1413 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1414 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1419 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1420 ".debug", strlen(".debug")) == 0)
1425 static void add_kallsyms(struct module
*mod
,
1427 unsigned int symindex
,
1428 unsigned int strindex
,
1429 const char *secstrings
)
1433 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1434 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1435 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1437 /* Set types up while we still have access to sections. */
1438 for (i
= 0; i
< mod
->num_symtab
; i
++)
1439 mod
->symtab
[i
].st_info
1440 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1443 static inline void add_kallsyms(struct module
*mod
,
1445 unsigned int symindex
,
1446 unsigned int strindex
,
1447 const char *secstrings
)
1450 #endif /* CONFIG_KALLSYMS */
1452 /* Allocate and load the module: note that size of section 0 is always
1453 zero, and we rely on this for optional sections. */
1454 static struct module
*load_module(void __user
*umod
,
1456 const char __user
*uargs
)
1460 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1462 unsigned int symindex
= 0;
1463 unsigned int strindex
= 0;
1464 unsigned int setupindex
;
1465 unsigned int exindex
;
1466 unsigned int exportindex
;
1467 unsigned int modindex
;
1468 unsigned int obsparmindex
;
1469 unsigned int infoindex
;
1470 unsigned int gplindex
;
1471 unsigned int crcindex
;
1472 unsigned int gplcrcindex
;
1473 unsigned int versindex
;
1474 unsigned int pcpuindex
;
1475 unsigned int gplfutureindex
;
1476 unsigned int gplfuturecrcindex
;
1477 unsigned int unwindex
= 0;
1478 unsigned int unusedindex
;
1479 unsigned int unusedcrcindex
;
1480 unsigned int unusedgplindex
;
1481 unsigned int unusedgplcrcindex
;
1484 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1485 struct exception_table_entry
*extable
;
1486 mm_segment_t old_fs
;
1488 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1490 if (len
< sizeof(*hdr
))
1491 return ERR_PTR(-ENOEXEC
);
1493 /* Suck in entire file: we'll want most of it. */
1494 /* vmalloc barfs on "unusual" numbers. Check here */
1495 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1496 return ERR_PTR(-ENOMEM
);
1497 if (copy_from_user(hdr
, umod
, len
) != 0) {
1502 /* Sanity checks against insmoding binaries or wrong arch,
1503 weird elf version */
1504 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1505 || hdr
->e_type
!= ET_REL
1506 || !elf_check_arch(hdr
)
1507 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1512 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1515 /* Convenience variables */
1516 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1517 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1518 sechdrs
[0].sh_addr
= 0;
1520 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1521 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1522 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1525 /* Mark all sections sh_addr with their address in the
1527 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1529 /* Internal symbols and strings. */
1530 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1532 strindex
= sechdrs
[i
].sh_link
;
1533 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1535 #ifndef CONFIG_MODULE_UNLOAD
1536 /* Don't load .exit sections */
1537 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1538 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1542 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1543 ".gnu.linkonce.this_module");
1545 printk(KERN_WARNING
"No module found in object\n");
1549 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1551 if (symindex
== 0) {
1552 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1558 /* Optional sections */
1559 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1560 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1561 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1562 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1563 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1564 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1565 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1566 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1567 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1568 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1569 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1570 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1571 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1572 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1573 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1574 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1575 #ifdef ARCH_UNWIND_SECTION_NAME
1576 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1579 /* Don't keep modinfo section */
1580 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1581 #ifdef CONFIG_KALLSYMS
1582 /* Keep symbol and string tables for decoding later. */
1583 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1584 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1587 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1589 /* Check module struct version now, before we try to use module. */
1590 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1595 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1596 /* This is allowed: modprobe --force will invalidate it. */
1598 add_taint(TAINT_FORCED_MODULE
);
1599 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1601 } else if (!same_magic(modmagic
, vermagic
)) {
1602 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1603 mod
->name
, modmagic
, vermagic
);
1608 /* Now copy in args */
1609 args
= strndup_user(uargs
, ~0UL >> 1);
1611 err
= PTR_ERR(args
);
1615 if (find_module(mod
->name
)) {
1620 mod
->state
= MODULE_STATE_COMING
;
1622 /* Allow arches to frob section contents and sizes. */
1623 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1628 /* We have a special allocation for this section. */
1629 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1630 sechdrs
[pcpuindex
].sh_addralign
,
1636 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1637 mod
->percpu
= percpu
;
1640 /* Determine total sizes, and put offsets in sh_entsize. For now
1641 this is done generically; there doesn't appear to be any
1642 special cases for the architectures. */
1643 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1645 /* Do the allocs. */
1646 ptr
= module_alloc(mod
->core_size
);
1651 memset(ptr
, 0, mod
->core_size
);
1652 mod
->module_core
= ptr
;
1654 ptr
= module_alloc(mod
->init_size
);
1655 if (!ptr
&& mod
->init_size
) {
1659 memset(ptr
, 0, mod
->init_size
);
1660 mod
->module_init
= ptr
;
1662 /* Transfer each section which specifies SHF_ALLOC */
1663 DEBUGP("final section addresses:\n");
1664 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1667 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1670 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1671 dest
= mod
->module_init
1672 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1674 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1676 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1677 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1678 sechdrs
[i
].sh_size
);
1679 /* Update sh_addr to point to copy in image. */
1680 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1681 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1683 /* Module has been moved. */
1684 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1686 /* Now we've moved module, initialize linked lists, etc. */
1687 module_unload_init(mod
);
1689 /* Set up license info based on the info section */
1690 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1692 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1693 add_taint(TAINT_PROPRIETARY_MODULE
);
1694 if (strcmp(mod
->name
, "driverloader") == 0)
1695 add_taint(TAINT_PROPRIETARY_MODULE
);
1697 /* Set up MODINFO_ATTR fields */
1698 setup_modinfo(mod
, sechdrs
, infoindex
);
1700 /* Fix up syms, so that st_value is a pointer to location. */
1701 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1706 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1707 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1708 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1710 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1711 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1712 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1714 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1715 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1716 sizeof(*mod
->gpl_future_syms
);
1717 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1718 sizeof(*mod
->unused_syms
);
1719 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1720 sizeof(*mod
->unused_gpl_syms
);
1721 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1722 if (gplfuturecrcindex
)
1723 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1725 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1727 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1728 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1729 if (unusedgplcrcindex
)
1730 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1732 #ifdef CONFIG_MODVERSIONS
1733 if ((mod
->num_syms
&& !crcindex
) ||
1734 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1735 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1736 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1737 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1738 printk(KERN_WARNING
"%s: No versions for exported symbols."
1739 " Tainting kernel.\n", mod
->name
);
1740 add_taint(TAINT_FORCED_MODULE
);
1744 /* Now do relocations. */
1745 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1746 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1747 unsigned int info
= sechdrs
[i
].sh_info
;
1749 /* Not a valid relocation section? */
1750 if (info
>= hdr
->e_shnum
)
1753 /* Don't bother with non-allocated sections */
1754 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1757 if (sechdrs
[i
].sh_type
== SHT_REL
)
1758 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1759 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1760 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1766 /* Find duplicate symbols */
1767 err
= verify_export_symbols(mod
);
1772 /* Set up and sort exception table */
1773 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1774 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1775 sort_extable(extable
, extable
+ mod
->num_exentries
);
1777 /* Finally, copy percpu area over. */
1778 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1779 sechdrs
[pcpuindex
].sh_size
);
1781 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1783 err
= module_finalize(hdr
, sechdrs
, mod
);
1787 /* flush the icache in correct context */
1792 * Flush the instruction cache, since we've played with text.
1793 * Do it before processing of module parameters, so the module
1794 * can provide parameter accessor functions of its own.
1796 if (mod
->module_init
)
1797 flush_icache_range((unsigned long)mod
->module_init
,
1798 (unsigned long)mod
->module_init
1800 flush_icache_range((unsigned long)mod
->module_core
,
1801 (unsigned long)mod
->module_core
+ mod
->core_size
);
1807 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
1810 /* Size of section 0 is 0, so this works well if no params */
1811 err
= parse_args(mod
->name
, mod
->args
,
1812 (struct kernel_param
*)
1813 sechdrs
[setupindex
].sh_addr
,
1814 sechdrs
[setupindex
].sh_size
1815 / sizeof(struct kernel_param
),
1820 err
= mod_sysfs_setup(mod
,
1821 (struct kernel_param
*)
1822 sechdrs
[setupindex
].sh_addr
,
1823 sechdrs
[setupindex
].sh_size
1824 / sizeof(struct kernel_param
));
1827 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1829 /* Size of section 0 is 0, so this works well if no unwind info. */
1830 mod
->unwind_info
= unwind_add_table(mod
,
1831 (void *)sechdrs
[unwindex
].sh_addr
,
1832 sechdrs
[unwindex
].sh_size
);
1834 /* Get rid of temporary copy */
1841 module_arch_cleanup(mod
);
1843 module_unload_free(mod
);
1844 module_free(mod
, mod
->module_init
);
1846 module_free(mod
, mod
->module_core
);
1849 percpu_modfree(percpu
);
1854 return ERR_PTR(err
);
1857 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1863 * link the module with the whole machine is stopped with interrupts off
1864 * - this defends against kallsyms not taking locks
1866 static int __link_module(void *_mod
)
1868 struct module
*mod
= _mod
;
1869 list_add(&mod
->list
, &modules
);
1873 /* This is where the real work happens */
1875 sys_init_module(void __user
*umod
,
1877 const char __user
*uargs
)
1882 /* Must have permission */
1883 if (!capable(CAP_SYS_MODULE
))
1886 /* Only one module load at a time, please */
1887 if (mutex_lock_interruptible(&module_mutex
) != 0)
1890 /* Do all the hard work */
1891 mod
= load_module(umod
, len
, uargs
);
1893 mutex_unlock(&module_mutex
);
1894 return PTR_ERR(mod
);
1897 /* Now sew it into the lists. They won't access us, since
1898 strong_try_module_get() will fail. */
1899 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1901 /* Drop lock so they can recurse */
1902 mutex_unlock(&module_mutex
);
1904 blocking_notifier_call_chain(&module_notify_list
,
1905 MODULE_STATE_COMING
, mod
);
1907 /* Start the module */
1908 if (mod
->init
!= NULL
)
1911 /* Init routine failed: abort. Try to protect us from
1912 buggy refcounters. */
1913 mod
->state
= MODULE_STATE_GOING
;
1914 synchronize_sched();
1916 printk(KERN_ERR
"%s: module is now stuck!\n",
1920 mutex_lock(&module_mutex
);
1922 mutex_unlock(&module_mutex
);
1927 /* Now it's a first class citizen! */
1928 mutex_lock(&module_mutex
);
1929 mod
->state
= MODULE_STATE_LIVE
;
1930 /* Drop initial reference. */
1932 unwind_remove_table(mod
->unwind_info
, 1);
1933 module_free(mod
, mod
->module_init
);
1934 mod
->module_init
= NULL
;
1936 mod
->init_text_size
= 0;
1937 mutex_unlock(&module_mutex
);
1942 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
1944 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
1947 #ifdef CONFIG_KALLSYMS
1949 * This ignores the intensely annoying "mapping symbols" found
1950 * in ARM ELF files: $a, $t and $d.
1952 static inline int is_arm_mapping_symbol(const char *str
)
1954 return str
[0] == '$' && strchr("atd", str
[1])
1955 && (str
[2] == '\0' || str
[2] == '.');
1958 static const char *get_ksymbol(struct module
*mod
,
1960 unsigned long *size
,
1961 unsigned long *offset
)
1963 unsigned int i
, best
= 0;
1964 unsigned long nextval
;
1966 /* At worse, next value is at end of module */
1967 if (within(addr
, mod
->module_init
, mod
->init_size
))
1968 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
1970 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
1972 /* Scan for closest preceeding symbol, and next symbol. (ELF
1973 starts real symbols at 1). */
1974 for (i
= 1; i
< mod
->num_symtab
; i
++) {
1975 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
1978 /* We ignore unnamed symbols: they're uninformative
1979 * and inserted at a whim. */
1980 if (mod
->symtab
[i
].st_value
<= addr
1981 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
1982 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1983 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1985 if (mod
->symtab
[i
].st_value
> addr
1986 && mod
->symtab
[i
].st_value
< nextval
1987 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1988 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1989 nextval
= mod
->symtab
[i
].st_value
;
1995 *size
= nextval
- mod
->symtab
[best
].st_value
;
1996 *offset
= addr
- mod
->symtab
[best
].st_value
;
1997 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2000 /* For kallsyms to ask for address resolution. NULL means not found.
2001 We don't lock, as this is used for oops resolution and races are a
2003 const char *module_address_lookup(unsigned long addr
,
2004 unsigned long *size
,
2005 unsigned long *offset
,
2010 list_for_each_entry(mod
, &modules
, list
) {
2011 if (within(addr
, mod
->module_init
, mod
->init_size
)
2012 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2013 *modname
= mod
->name
;
2014 return get_ksymbol(mod
, addr
, size
, offset
);
2020 struct module
*module_get_kallsym(unsigned int symnum
,
2021 unsigned long *value
,
2027 mutex_lock(&module_mutex
);
2028 list_for_each_entry(mod
, &modules
, list
) {
2029 if (symnum
< mod
->num_symtab
) {
2030 *value
= mod
->symtab
[symnum
].st_value
;
2031 *type
= mod
->symtab
[symnum
].st_info
;
2033 mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2035 mutex_unlock(&module_mutex
);
2038 symnum
-= mod
->num_symtab
;
2040 mutex_unlock(&module_mutex
);
2044 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2048 for (i
= 0; i
< mod
->num_symtab
; i
++)
2049 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2050 mod
->symtab
[i
].st_info
!= 'U')
2051 return mod
->symtab
[i
].st_value
;
2055 /* Look for this name: can be of form module:name. */
2056 unsigned long module_kallsyms_lookup_name(const char *name
)
2060 unsigned long ret
= 0;
2062 /* Don't lock: we're in enough trouble already. */
2063 if ((colon
= strchr(name
, ':')) != NULL
) {
2065 if ((mod
= find_module(name
)) != NULL
)
2066 ret
= mod_find_symname(mod
, colon
+1);
2069 list_for_each_entry(mod
, &modules
, list
)
2070 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2075 #endif /* CONFIG_KALLSYMS */
2077 /* Called by the /proc file system to return a list of modules. */
2078 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2080 struct list_head
*i
;
2083 mutex_lock(&module_mutex
);
2084 list_for_each(i
, &modules
) {
2093 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2095 struct list_head
*i
= p
;
2097 if (i
->next
== &modules
)
2102 static void m_stop(struct seq_file
*m
, void *p
)
2104 mutex_unlock(&module_mutex
);
2107 static int m_show(struct seq_file
*m
, void *p
)
2109 struct module
*mod
= list_entry(p
, struct module
, list
);
2110 seq_printf(m
, "%s %lu",
2111 mod
->name
, mod
->init_size
+ mod
->core_size
);
2112 print_unload_info(m
, mod
);
2114 /* Informative for users. */
2115 seq_printf(m
, " %s",
2116 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2117 mod
->state
== MODULE_STATE_COMING
? "Loading":
2119 /* Used by oprofile and other similar tools. */
2120 seq_printf(m
, " 0x%p", mod
->module_core
);
2122 seq_printf(m
, "\n");
2126 /* Format: modulename size refcount deps address
2128 Where refcount is a number or -, and deps is a comma-separated list
2131 struct seq_operations modules_op
= {
2138 /* Given an address, look for it in the module exception tables. */
2139 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2141 unsigned long flags
;
2142 const struct exception_table_entry
*e
= NULL
;
2145 spin_lock_irqsave(&modlist_lock
, flags
);
2146 list_for_each_entry(mod
, &modules
, list
) {
2147 if (mod
->num_exentries
== 0)
2150 e
= search_extable(mod
->extable
,
2151 mod
->extable
+ mod
->num_exentries
- 1,
2156 spin_unlock_irqrestore(&modlist_lock
, flags
);
2158 /* Now, if we found one, we are running inside it now, hence
2159 we cannot unload the module, hence no refcnt needed. */
2163 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2164 struct module
*__module_text_address(unsigned long addr
)
2168 list_for_each_entry(mod
, &modules
, list
)
2169 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2170 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2175 struct module
*module_text_address(unsigned long addr
)
2178 unsigned long flags
;
2180 spin_lock_irqsave(&modlist_lock
, flags
);
2181 mod
= __module_text_address(addr
);
2182 spin_unlock_irqrestore(&modlist_lock
, flags
);
2187 /* Don't grab lock, we're oopsing. */
2188 void print_modules(void)
2192 printk("Modules linked in:");
2193 list_for_each_entry(mod
, &modules
, list
)
2194 printk(" %s", mod
->name
);
2198 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2203 /* Don't check return code; this call is idempotent */
2204 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2206 EXPORT_SYMBOL(module_add_driver
);
2208 void module_remove_driver(struct device_driver
*drv
)
2212 sysfs_remove_link(&drv
->kobj
, "module");
2214 EXPORT_SYMBOL(module_remove_driver
);
2216 #ifdef CONFIG_MODVERSIONS
2217 /* Generate the signature for struct module here, too, for modversions. */
2218 void struct_module(struct module
*mod
) { return; }
2219 EXPORT_SYMBOL(struct_module
);