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/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/init.h>
22 #include <linux/kallsyms.h>
23 #include <linux/sysfs.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/elf.h>
28 #include <linux/seq_file.h>
29 #include <linux/syscalls.h>
30 #include <linux/fcntl.h>
31 #include <linux/rcupdate.h>
32 #include <linux/capability.h>
33 #include <linux/cpu.h>
34 #include <linux/moduleparam.h>
35 #include <linux/errno.h>
36 #include <linux/err.h>
37 #include <linux/vermagic.h>
38 #include <linux/notifier.h>
39 #include <linux/sched.h>
40 #include <linux/stop_machine.h>
41 #include <linux/device.h>
42 #include <linux/string.h>
43 #include <linux/mutex.h>
44 #include <linux/unwind.h>
45 #include <asm/uaccess.h>
46 #include <asm/semaphore.h>
47 #include <asm/cacheflush.h>
48 #include <linux/license.h>
49 #include <asm/sections.h>
54 #define DEBUGP(fmt , a...)
57 #ifndef ARCH_SHF_SMALL
58 #define ARCH_SHF_SMALL 0
61 /* If this is set, the section belongs in the init part of the module */
62 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
64 /* List of modules, protected by module_mutex or preempt_disable
65 * (add/delete uses stop_machine). */
66 static DEFINE_MUTEX(module_mutex
);
67 static LIST_HEAD(modules
);
69 /* Waiting for a module to finish initializing? */
70 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
72 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
74 int register_module_notifier(struct notifier_block
* nb
)
76 return blocking_notifier_chain_register(&module_notify_list
, nb
);
78 EXPORT_SYMBOL(register_module_notifier
);
80 int unregister_module_notifier(struct notifier_block
* nb
)
82 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
84 EXPORT_SYMBOL(unregister_module_notifier
);
86 /* We require a truly strong try_module_get(): 0 means failure due to
87 ongoing or failed initialization etc. */
88 static inline int strong_try_module_get(struct module
*mod
)
90 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
92 if (try_module_get(mod
))
98 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
105 * A thread that wants to hold a reference to a module only while it
106 * is running can call this to safely exit. nfsd and lockd use this.
108 void __module_put_and_exit(struct module
*mod
, long code
)
113 EXPORT_SYMBOL(__module_put_and_exit
);
115 /* Find a module section: 0 means not found. */
116 static unsigned int find_sec(Elf_Ehdr
*hdr
,
118 const char *secstrings
,
123 for (i
= 1; i
< hdr
->e_shnum
; i
++)
124 /* Alloc bit cleared means "ignore it." */
125 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
126 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
131 /* Provided by the linker */
132 extern const struct kernel_symbol __start___ksymtab
[];
133 extern const struct kernel_symbol __stop___ksymtab
[];
134 extern const struct kernel_symbol __start___ksymtab_gpl
[];
135 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
136 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
137 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
138 extern const struct kernel_symbol __start___ksymtab_unused
[];
139 extern const struct kernel_symbol __stop___ksymtab_unused
[];
140 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
141 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
142 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
143 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
144 extern const unsigned long __start___kcrctab
[];
145 extern const unsigned long __start___kcrctab_gpl
[];
146 extern const unsigned long __start___kcrctab_gpl_future
[];
147 extern const unsigned long __start___kcrctab_unused
[];
148 extern const unsigned long __start___kcrctab_unused_gpl
[];
150 #ifndef CONFIG_MODVERSIONS
151 #define symversion(base, idx) NULL
153 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
156 /* lookup symbol in given range of kernel_symbols */
157 static const struct kernel_symbol
*lookup_symbol(const char *name
,
158 const struct kernel_symbol
*start
,
159 const struct kernel_symbol
*stop
)
161 const struct kernel_symbol
*ks
= start
;
162 for (; ks
< stop
; ks
++)
163 if (strcmp(ks
->name
, name
) == 0)
168 static void printk_unused_warning(const char *name
)
170 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
171 "however this module is using it.\n", name
);
172 printk(KERN_WARNING
"This symbol will go away in the future.\n");
173 printk(KERN_WARNING
"Please evalute if this is the right api to use, "
174 "and if it really is, submit a report the linux kernel "
175 "mailinglist together with submitting your code for "
179 /* Find a symbol, return value, crc and module which owns it */
180 static unsigned long __find_symbol(const char *name
,
181 struct module
**owner
,
182 const unsigned long **crc
,
186 const struct kernel_symbol
*ks
;
188 /* Core kernel first. */
190 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
192 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
196 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
197 __stop___ksymtab_gpl
);
199 *crc
= symversion(__start___kcrctab_gpl
,
200 (ks
- __start___ksymtab_gpl
));
204 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
205 __stop___ksymtab_gpl_future
);
208 printk(KERN_WARNING
"Symbol %s is being used "
209 "by a non-GPL module, which will not "
210 "be allowed in the future\n", name
);
211 printk(KERN_WARNING
"Please see the file "
212 "Documentation/feature-removal-schedule.txt "
213 "in the kernel source tree for more "
216 *crc
= symversion(__start___kcrctab_gpl_future
,
217 (ks
- __start___ksymtab_gpl_future
));
221 ks
= lookup_symbol(name
, __start___ksymtab_unused
,
222 __stop___ksymtab_unused
);
224 printk_unused_warning(name
);
225 *crc
= symversion(__start___kcrctab_unused
,
226 (ks
- __start___ksymtab_unused
));
231 ks
= lookup_symbol(name
, __start___ksymtab_unused_gpl
,
232 __stop___ksymtab_unused_gpl
);
234 printk_unused_warning(name
);
235 *crc
= symversion(__start___kcrctab_unused_gpl
,
236 (ks
- __start___ksymtab_unused_gpl
));
240 /* Now try modules. */
241 list_for_each_entry(mod
, &modules
, list
) {
243 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
245 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
250 ks
= lookup_symbol(name
, mod
->gpl_syms
,
251 mod
->gpl_syms
+ mod
->num_gpl_syms
);
253 *crc
= symversion(mod
->gpl_crcs
,
254 (ks
- mod
->gpl_syms
));
258 ks
= lookup_symbol(name
, mod
->unused_syms
, mod
->unused_syms
+ mod
->num_unused_syms
);
260 printk_unused_warning(name
);
261 *crc
= symversion(mod
->unused_crcs
, (ks
- mod
->unused_syms
));
266 ks
= lookup_symbol(name
, mod
->unused_gpl_syms
,
267 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
);
269 printk_unused_warning(name
);
270 *crc
= symversion(mod
->unused_gpl_crcs
,
271 (ks
- mod
->unused_gpl_syms
));
275 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
276 (mod
->gpl_future_syms
+
277 mod
->num_gpl_future_syms
));
280 printk(KERN_WARNING
"Symbol %s is being used "
281 "by a non-GPL module, which will not "
282 "be allowed in the future\n", name
);
283 printk(KERN_WARNING
"Please see the file "
284 "Documentation/feature-removal-schedule.txt "
285 "in the kernel source tree for more "
288 *crc
= symversion(mod
->gpl_future_crcs
,
289 (ks
- mod
->gpl_future_syms
));
293 DEBUGP("Failed to find symbol %s\n", name
);
297 /* Search for module by name: must hold module_mutex. */
298 static struct module
*find_module(const char *name
)
302 list_for_each_entry(mod
, &modules
, list
) {
303 if (strcmp(mod
->name
, name
) == 0)
310 /* Number of blocks used and allocated. */
311 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
312 /* Size of each block. -ve means used. */
313 static int *pcpu_size
;
315 static int split_block(unsigned int i
, unsigned short size
)
317 /* Reallocation required? */
318 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
321 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
326 pcpu_num_allocated
*= 2;
330 /* Insert a new subblock */
331 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
332 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
335 pcpu_size
[i
+1] -= size
;
340 static inline unsigned int block_size(int val
)
347 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
354 if (align
> PAGE_SIZE
) {
355 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
356 name
, align
, PAGE_SIZE
);
360 ptr
= __per_cpu_start
;
361 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
362 /* Extra for alignment requirement. */
363 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
364 BUG_ON(i
== 0 && extra
!= 0);
366 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
369 /* Transfer extra to previous block. */
370 if (pcpu_size
[i
-1] < 0)
371 pcpu_size
[i
-1] -= extra
;
373 pcpu_size
[i
-1] += extra
;
374 pcpu_size
[i
] -= extra
;
377 /* Split block if warranted */
378 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
379 if (!split_block(i
, size
))
383 pcpu_size
[i
] = -pcpu_size
[i
];
387 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
392 static void percpu_modfree(void *freeme
)
395 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
397 /* First entry is core kernel percpu data. */
398 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
400 pcpu_size
[i
] = -pcpu_size
[i
];
407 /* Merge with previous? */
408 if (pcpu_size
[i
-1] >= 0) {
409 pcpu_size
[i
-1] += pcpu_size
[i
];
411 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
412 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
415 /* Merge with next? */
416 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
417 pcpu_size
[i
] += pcpu_size
[i
+1];
419 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
420 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
424 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
426 const char *secstrings
)
428 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
431 static void percpu_modcopy(void *pcpudest
, const void *from
, unsigned long size
)
435 for_each_possible_cpu(cpu
)
436 memcpy(pcpudest
+ per_cpu_offset(cpu
), from
, size
);
439 static int percpu_modinit(void)
442 pcpu_num_allocated
= 2;
443 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
445 /* Static in-kernel percpu data (used). */
446 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
448 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
449 if (pcpu_size
[1] < 0) {
450 printk(KERN_ERR
"No per-cpu room for modules.\n");
456 __initcall(percpu_modinit
);
457 #else /* ... !CONFIG_SMP */
458 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
463 static inline void percpu_modfree(void *pcpuptr
)
467 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
469 const char *secstrings
)
473 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
476 /* pcpusec should be 0, and size of that section should be 0. */
479 #endif /* CONFIG_SMP */
481 #define MODINFO_ATTR(field) \
482 static void setup_modinfo_##field(struct module *mod, const char *s) \
484 mod->field = kstrdup(s, GFP_KERNEL); \
486 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
487 struct module *mod, char *buffer) \
489 return sprintf(buffer, "%s\n", mod->field); \
491 static int modinfo_##field##_exists(struct module *mod) \
493 return mod->field != NULL; \
495 static void free_modinfo_##field(struct module *mod) \
500 static struct module_attribute modinfo_##field = { \
501 .attr = { .name = __stringify(field), .mode = 0444 }, \
502 .show = show_modinfo_##field, \
503 .setup = setup_modinfo_##field, \
504 .test = modinfo_##field##_exists, \
505 .free = free_modinfo_##field, \
508 MODINFO_ATTR(version
);
509 MODINFO_ATTR(srcversion
);
511 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
513 #ifdef CONFIG_MODULE_UNLOAD
514 /* Init the unload section of the module. */
515 static void module_unload_init(struct module
*mod
)
519 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
520 for (i
= 0; i
< NR_CPUS
; i
++)
521 local_set(&mod
->ref
[i
].count
, 0);
522 /* Hold reference count during initialization. */
523 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
524 /* Backwards compatibility macros put refcount during init. */
525 mod
->waiter
= current
;
528 /* modules using other modules */
531 struct list_head list
;
532 struct module
*module_which_uses
;
535 /* Does a already use b? */
536 static int already_uses(struct module
*a
, struct module
*b
)
538 struct module_use
*use
;
540 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
541 if (use
->module_which_uses
== a
) {
542 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
546 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
550 /* Module a uses b */
551 static int use_module(struct module
*a
, struct module
*b
)
553 struct module_use
*use
;
556 if (b
== NULL
|| already_uses(a
, b
)) return 1;
558 /* If we're interrupted or time out, we fail. */
559 if (wait_event_interruptible_timeout(
560 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
562 printk("%s: gave up waiting for init of module %s.\n",
567 /* If strong_try_module_get() returned a different error, we fail. */
571 DEBUGP("Allocating new usage for %s.\n", a
->name
);
572 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
574 printk("%s: out of memory loading\n", a
->name
);
579 use
->module_which_uses
= a
;
580 list_add(&use
->list
, &b
->modules_which_use_me
);
581 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
585 /* Clear the unload stuff of the module. */
586 static void module_unload_free(struct module
*mod
)
590 list_for_each_entry(i
, &modules
, list
) {
591 struct module_use
*use
;
593 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
594 if (use
->module_which_uses
== mod
) {
595 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
597 list_del(&use
->list
);
599 sysfs_remove_link(i
->holders_dir
, mod
->name
);
600 /* There can be at most one match. */
607 #ifdef CONFIG_MODULE_FORCE_UNLOAD
608 static inline int try_force_unload(unsigned int flags
)
610 int ret
= (flags
& O_TRUNC
);
612 add_taint(TAINT_FORCED_RMMOD
);
616 static inline int try_force_unload(unsigned int flags
)
620 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
629 /* Whole machine is stopped with interrupts off when this runs. */
630 static int __try_stop_module(void *_sref
)
632 struct stopref
*sref
= _sref
;
634 /* If it's not unused, quit unless we are told to block. */
635 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
636 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
640 /* Mark it as dying. */
641 sref
->mod
->state
= MODULE_STATE_GOING
;
645 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
647 struct stopref sref
= { mod
, flags
, forced
};
649 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
652 unsigned int module_refcount(struct module
*mod
)
654 unsigned int i
, total
= 0;
656 for (i
= 0; i
< NR_CPUS
; i
++)
657 total
+= local_read(&mod
->ref
[i
].count
);
660 EXPORT_SYMBOL(module_refcount
);
662 /* This exists whether we can unload or not */
663 static void free_module(struct module
*mod
);
665 static void wait_for_zero_refcount(struct module
*mod
)
667 /* Since we might sleep for some time, drop the semaphore first */
668 mutex_unlock(&module_mutex
);
670 DEBUGP("Looking at refcount...\n");
671 set_current_state(TASK_UNINTERRUPTIBLE
);
672 if (module_refcount(mod
) == 0)
676 current
->state
= TASK_RUNNING
;
677 mutex_lock(&module_mutex
);
681 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
684 char name
[MODULE_NAME_LEN
];
687 if (!capable(CAP_SYS_MODULE
))
690 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
692 name
[MODULE_NAME_LEN
-1] = '\0';
694 if (mutex_lock_interruptible(&module_mutex
) != 0)
697 mod
= find_module(name
);
703 if (!list_empty(&mod
->modules_which_use_me
)) {
704 /* Other modules depend on us: get rid of them first. */
709 /* Doing init or already dying? */
710 if (mod
->state
!= MODULE_STATE_LIVE
) {
711 /* FIXME: if (force), slam module count and wake up
713 DEBUGP("%s already dying\n", mod
->name
);
718 /* If it has an init func, it must have an exit func to unload */
719 if (mod
->init
&& !mod
->exit
) {
720 forced
= try_force_unload(flags
);
722 /* This module can't be removed */
728 /* Set this up before setting mod->state */
729 mod
->waiter
= current
;
731 /* Stop the machine so refcounts can't move and disable module. */
732 ret
= try_stop_module(mod
, flags
, &forced
);
736 /* Never wait if forced. */
737 if (!forced
&& module_refcount(mod
) != 0)
738 wait_for_zero_refcount(mod
);
740 /* Final destruction now noone is using it. */
741 if (mod
->exit
!= NULL
) {
742 mutex_unlock(&module_mutex
);
744 mutex_lock(&module_mutex
);
746 /* Store the name of the last unloaded module for diagnostic purposes */
747 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
751 mutex_unlock(&module_mutex
);
755 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
757 struct module_use
*use
;
758 int printed_something
= 0;
760 seq_printf(m
, " %u ", module_refcount(mod
));
762 /* Always include a trailing , so userspace can differentiate
763 between this and the old multi-field proc format. */
764 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
765 printed_something
= 1;
766 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
769 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
770 printed_something
= 1;
771 seq_printf(m
, "[permanent],");
774 if (!printed_something
)
778 void __symbol_put(const char *symbol
)
780 struct module
*owner
;
781 const unsigned long *crc
;
784 if (IS_ERR_VALUE(__find_symbol(symbol
, &owner
, &crc
, 1)))
789 EXPORT_SYMBOL(__symbol_put
);
791 void symbol_put_addr(void *addr
)
793 struct module
*modaddr
;
795 if (core_kernel_text((unsigned long)addr
))
798 if (!(modaddr
= module_text_address((unsigned long)addr
)))
802 EXPORT_SYMBOL_GPL(symbol_put_addr
);
804 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
805 struct module
*mod
, char *buffer
)
807 return sprintf(buffer
, "%u\n", module_refcount(mod
));
810 static struct module_attribute refcnt
= {
811 .attr
= { .name
= "refcnt", .mode
= 0444 },
815 void module_put(struct module
*module
)
818 unsigned int cpu
= get_cpu();
819 local_dec(&module
->ref
[cpu
].count
);
820 /* Maybe they're waiting for us to drop reference? */
821 if (unlikely(!module_is_live(module
)))
822 wake_up_process(module
->waiter
);
826 EXPORT_SYMBOL(module_put
);
828 #else /* !CONFIG_MODULE_UNLOAD */
829 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
831 /* We don't know the usage count, or what modules are using. */
832 seq_printf(m
, " - -");
835 static inline void module_unload_free(struct module
*mod
)
839 static inline int use_module(struct module
*a
, struct module
*b
)
841 return strong_try_module_get(b
) == 0;
844 static inline void module_unload_init(struct module
*mod
)
847 #endif /* CONFIG_MODULE_UNLOAD */
849 static ssize_t
show_initstate(struct module_attribute
*mattr
,
850 struct module
*mod
, char *buffer
)
852 const char *state
= "unknown";
854 switch (mod
->state
) {
855 case MODULE_STATE_LIVE
:
858 case MODULE_STATE_COMING
:
861 case MODULE_STATE_GOING
:
865 return sprintf(buffer
, "%s\n", state
);
868 static struct module_attribute initstate
= {
869 .attr
= { .name
= "initstate", .mode
= 0444 },
870 .show
= show_initstate
,
873 static struct module_attribute
*modinfo_attrs
[] = {
877 #ifdef CONFIG_MODULE_UNLOAD
883 static const char vermagic
[] = VERMAGIC_STRING
;
885 #ifdef CONFIG_MODVERSIONS
886 static int check_version(Elf_Shdr
*sechdrs
,
887 unsigned int versindex
,
890 const unsigned long *crc
)
892 unsigned int i
, num_versions
;
893 struct modversion_info
*versions
;
895 /* Exporting module didn't supply crcs? OK, we're already tainted. */
899 versions
= (void *) sechdrs
[versindex
].sh_addr
;
900 num_versions
= sechdrs
[versindex
].sh_size
901 / sizeof(struct modversion_info
);
903 for (i
= 0; i
< num_versions
; i
++) {
904 if (strcmp(versions
[i
].name
, symname
) != 0)
907 if (versions
[i
].crc
== *crc
)
909 printk("%s: disagrees about version of symbol %s\n",
911 DEBUGP("Found checksum %lX vs module %lX\n",
912 *crc
, versions
[i
].crc
);
915 /* Not in module's version table. OK, but that taints the kernel. */
916 if (!(tainted
& TAINT_FORCED_MODULE
))
917 printk("%s: no version for \"%s\" found: kernel tainted.\n",
919 add_taint_module(mod
, TAINT_FORCED_MODULE
);
923 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
924 unsigned int versindex
,
927 const unsigned long *crc
;
928 struct module
*owner
;
930 if (IS_ERR_VALUE(__find_symbol("struct_module",
933 return check_version(sechdrs
, versindex
, "struct_module", mod
,
937 /* First part is kernel version, which we ignore. */
938 static inline int same_magic(const char *amagic
, const char *bmagic
)
940 amagic
+= strcspn(amagic
, " ");
941 bmagic
+= strcspn(bmagic
, " ");
942 return strcmp(amagic
, bmagic
) == 0;
945 static inline int check_version(Elf_Shdr
*sechdrs
,
946 unsigned int versindex
,
949 const unsigned long *crc
)
954 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
955 unsigned int versindex
,
961 static inline int same_magic(const char *amagic
, const char *bmagic
)
963 return strcmp(amagic
, bmagic
) == 0;
965 #endif /* CONFIG_MODVERSIONS */
967 /* Resolve a symbol for this module. I.e. if we find one, record usage.
968 Must be holding module_mutex. */
969 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
970 unsigned int versindex
,
974 struct module
*owner
;
976 const unsigned long *crc
;
978 ret
= __find_symbol(name
, &owner
, &crc
,
979 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
));
980 if (!IS_ERR_VALUE(ret
)) {
981 /* use_module can fail due to OOM,
982 or module initialization or unloading */
983 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
984 !use_module(mod
, owner
))
991 * /sys/module/foo/sections stuff
992 * J. Corbet <corbet@lwn.net>
994 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
995 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
996 struct module
*mod
, char *buf
)
998 struct module_sect_attr
*sattr
=
999 container_of(mattr
, struct module_sect_attr
, mattr
);
1000 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1003 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1007 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1008 kfree(sect_attrs
->attrs
[section
].name
);
1012 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1013 char *secstrings
, Elf_Shdr
*sechdrs
)
1015 unsigned int nloaded
= 0, i
, size
[2];
1016 struct module_sect_attrs
*sect_attrs
;
1017 struct module_sect_attr
*sattr
;
1018 struct attribute
**gattr
;
1020 /* Count loaded sections and allocate structures */
1021 for (i
= 0; i
< nsect
; i
++)
1022 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1024 size
[0] = ALIGN(sizeof(*sect_attrs
)
1025 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1026 sizeof(sect_attrs
->grp
.attrs
[0]));
1027 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1028 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1029 if (sect_attrs
== NULL
)
1032 /* Setup section attributes. */
1033 sect_attrs
->grp
.name
= "sections";
1034 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1036 sect_attrs
->nsections
= 0;
1037 sattr
= §_attrs
->attrs
[0];
1038 gattr
= §_attrs
->grp
.attrs
[0];
1039 for (i
= 0; i
< nsect
; i
++) {
1040 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1042 sattr
->address
= sechdrs
[i
].sh_addr
;
1043 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1045 if (sattr
->name
== NULL
)
1047 sect_attrs
->nsections
++;
1048 sattr
->mattr
.show
= module_sect_show
;
1049 sattr
->mattr
.store
= NULL
;
1050 sattr
->mattr
.attr
.name
= sattr
->name
;
1051 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1052 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1056 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1059 mod
->sect_attrs
= sect_attrs
;
1062 free_sect_attrs(sect_attrs
);
1065 static void remove_sect_attrs(struct module
*mod
)
1067 if (mod
->sect_attrs
) {
1068 sysfs_remove_group(&mod
->mkobj
.kobj
,
1069 &mod
->sect_attrs
->grp
);
1070 /* We are positive that no one is using any sect attrs
1071 * at this point. Deallocate immediately. */
1072 free_sect_attrs(mod
->sect_attrs
);
1073 mod
->sect_attrs
= NULL
;
1078 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1081 struct module_notes_attrs
{
1082 struct kobject
*dir
;
1084 struct bin_attribute attrs
[0];
1087 static ssize_t
module_notes_read(struct kobject
*kobj
,
1088 struct bin_attribute
*bin_attr
,
1089 char *buf
, loff_t pos
, size_t count
)
1092 * The caller checked the pos and count against our size.
1094 memcpy(buf
, bin_attr
->private + pos
, count
);
1098 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1101 if (notes_attrs
->dir
) {
1103 sysfs_remove_bin_file(notes_attrs
->dir
,
1104 ¬es_attrs
->attrs
[i
]);
1105 kobject_del(notes_attrs
->dir
);
1110 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1111 char *secstrings
, Elf_Shdr
*sechdrs
)
1113 unsigned int notes
, loaded
, i
;
1114 struct module_notes_attrs
*notes_attrs
;
1115 struct bin_attribute
*nattr
;
1117 /* Count notes sections and allocate structures. */
1119 for (i
= 0; i
< nsect
; i
++)
1120 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1121 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1127 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1128 + notes
* sizeof(notes_attrs
->attrs
[0]),
1130 if (notes_attrs
== NULL
)
1133 notes_attrs
->notes
= notes
;
1134 nattr
= ¬es_attrs
->attrs
[0];
1135 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1136 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1138 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1139 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1140 nattr
->attr
.mode
= S_IRUGO
;
1141 nattr
->size
= sechdrs
[i
].sh_size
;
1142 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1143 nattr
->read
= module_notes_read
;
1149 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1150 if (!notes_attrs
->dir
)
1153 for (i
= 0; i
< notes
; ++i
)
1154 if (sysfs_create_bin_file(notes_attrs
->dir
,
1155 ¬es_attrs
->attrs
[i
]))
1158 mod
->notes_attrs
= notes_attrs
;
1162 free_notes_attrs(notes_attrs
, i
);
1165 static void remove_notes_attrs(struct module
*mod
)
1167 if (mod
->notes_attrs
)
1168 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1173 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1174 char *sectstrings
, Elf_Shdr
*sechdrs
)
1178 static inline void remove_sect_attrs(struct module
*mod
)
1182 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1183 char *sectstrings
, Elf_Shdr
*sechdrs
)
1187 static inline void remove_notes_attrs(struct module
*mod
)
1193 int module_add_modinfo_attrs(struct module
*mod
)
1195 struct module_attribute
*attr
;
1196 struct module_attribute
*temp_attr
;
1200 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1201 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1203 if (!mod
->modinfo_attrs
)
1206 temp_attr
= mod
->modinfo_attrs
;
1207 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1209 (attr
->test
&& attr
->test(mod
))) {
1210 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1211 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1218 void module_remove_modinfo_attrs(struct module
*mod
)
1220 struct module_attribute
*attr
;
1223 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1224 /* pick a field to test for end of list */
1225 if (!attr
->attr
.name
)
1227 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1231 kfree(mod
->modinfo_attrs
);
1234 int mod_sysfs_init(struct module
*mod
)
1237 struct kobject
*kobj
;
1239 if (!module_sysfs_initialized
) {
1240 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1246 kobj
= kset_find_obj(module_kset
, mod
->name
);
1248 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1254 mod
->mkobj
.mod
= mod
;
1256 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1257 mod
->mkobj
.kobj
.kset
= module_kset
;
1258 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1261 kobject_put(&mod
->mkobj
.kobj
);
1263 /* delay uevent until full sysfs population */
1268 int mod_sysfs_setup(struct module
*mod
,
1269 struct kernel_param
*kparam
,
1270 unsigned int num_params
)
1274 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1275 if (!mod
->holders_dir
) {
1280 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1282 goto out_unreg_holders
;
1284 err
= module_add_modinfo_attrs(mod
);
1286 goto out_unreg_param
;
1288 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1292 module_param_sysfs_remove(mod
);
1294 kobject_put(mod
->holders_dir
);
1296 kobject_put(&mod
->mkobj
.kobj
);
1301 static void mod_kobject_remove(struct module
*mod
)
1303 module_remove_modinfo_attrs(mod
);
1304 module_param_sysfs_remove(mod
);
1305 kobject_put(mod
->mkobj
.drivers_dir
);
1306 kobject_put(mod
->holders_dir
);
1307 kobject_put(&mod
->mkobj
.kobj
);
1311 * link the module with the whole machine is stopped with interrupts off
1312 * - this defends against kallsyms not taking locks
1314 static int __link_module(void *_mod
)
1316 struct module
*mod
= _mod
;
1317 list_add(&mod
->list
, &modules
);
1322 * unlink the module with the whole machine is stopped with interrupts off
1323 * - this defends against kallsyms not taking locks
1325 static int __unlink_module(void *_mod
)
1327 struct module
*mod
= _mod
;
1328 list_del(&mod
->list
);
1332 /* Free a module, remove from lists, etc (must hold module_mutex). */
1333 static void free_module(struct module
*mod
)
1335 /* Delete from various lists */
1336 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1337 remove_notes_attrs(mod
);
1338 remove_sect_attrs(mod
);
1339 mod_kobject_remove(mod
);
1341 unwind_remove_table(mod
->unwind_info
, 0);
1343 /* Arch-specific cleanup. */
1344 module_arch_cleanup(mod
);
1346 /* Module unload stuff */
1347 module_unload_free(mod
);
1349 /* This may be NULL, but that's OK */
1350 module_free(mod
, mod
->module_init
);
1353 percpu_modfree(mod
->percpu
);
1355 /* Free lock-classes: */
1356 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1358 /* Finally, free the core (containing the module structure) */
1359 module_free(mod
, mod
->module_core
);
1362 void *__symbol_get(const char *symbol
)
1364 struct module
*owner
;
1365 unsigned long value
;
1366 const unsigned long *crc
;
1369 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1370 if (IS_ERR_VALUE(value
))
1372 else if (strong_try_module_get(owner
))
1376 return (void *)value
;
1378 EXPORT_SYMBOL_GPL(__symbol_get
);
1381 * Ensure that an exported symbol [global namespace] does not already exist
1382 * in the kernel or in some other module's exported symbol table.
1384 static int verify_export_symbols(struct module
*mod
)
1386 const char *name
= NULL
;
1387 unsigned long i
, ret
= 0;
1388 struct module
*owner
;
1389 const unsigned long *crc
;
1391 for (i
= 0; i
< mod
->num_syms
; i
++)
1392 if (!IS_ERR_VALUE(__find_symbol(mod
->syms
[i
].name
,
1393 &owner
, &crc
, 1))) {
1394 name
= mod
->syms
[i
].name
;
1399 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1400 if (!IS_ERR_VALUE(__find_symbol(mod
->gpl_syms
[i
].name
,
1401 &owner
, &crc
, 1))) {
1402 name
= mod
->gpl_syms
[i
].name
;
1409 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1410 mod
->name
, name
, module_name(owner
));
1415 /* Change all symbols so that st_value encodes the pointer directly. */
1416 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1417 unsigned int symindex
,
1419 unsigned int versindex
,
1420 unsigned int pcpuindex
,
1423 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1424 unsigned long secbase
;
1425 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1428 for (i
= 1; i
< n
; i
++) {
1429 switch (sym
[i
].st_shndx
) {
1431 /* We compiled with -fno-common. These are not
1432 supposed to happen. */
1433 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1434 printk("%s: please compile with -fno-common\n",
1440 /* Don't need to do anything */
1441 DEBUGP("Absolute symbol: 0x%08lx\n",
1442 (long)sym
[i
].st_value
);
1447 = resolve_symbol(sechdrs
, versindex
,
1448 strtab
+ sym
[i
].st_name
, mod
);
1450 /* Ok if resolved. */
1451 if (!IS_ERR_VALUE(sym
[i
].st_value
))
1454 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1457 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1458 mod
->name
, strtab
+ sym
[i
].st_name
);
1463 /* Divert to percpu allocation if a percpu var. */
1464 if (sym
[i
].st_shndx
== pcpuindex
)
1465 secbase
= (unsigned long)mod
->percpu
;
1467 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1468 sym
[i
].st_value
+= secbase
;
1476 /* Update size with this section: return offset. */
1477 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1481 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1482 *size
= ret
+ sechdr
->sh_size
;
1486 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1487 might -- code, read-only data, read-write data, small data. Tally
1488 sizes, and place the offsets into sh_entsize fields: high bit means it
1490 static void layout_sections(struct module
*mod
,
1491 const Elf_Ehdr
*hdr
,
1493 const char *secstrings
)
1495 static unsigned long const masks
[][2] = {
1496 /* NOTE: all executable code must be the first section
1497 * in this array; otherwise modify the text_size
1498 * finder in the two loops below */
1499 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1500 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1501 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1502 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1506 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1507 sechdrs
[i
].sh_entsize
= ~0UL;
1509 DEBUGP("Core section allocation order:\n");
1510 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1511 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1512 Elf_Shdr
*s
= &sechdrs
[i
];
1514 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1515 || (s
->sh_flags
& masks
[m
][1])
1516 || s
->sh_entsize
!= ~0UL
1517 || strncmp(secstrings
+ s
->sh_name
,
1520 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1521 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1524 mod
->core_text_size
= mod
->core_size
;
1527 DEBUGP("Init section allocation order:\n");
1528 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1529 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1530 Elf_Shdr
*s
= &sechdrs
[i
];
1532 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1533 || (s
->sh_flags
& masks
[m
][1])
1534 || s
->sh_entsize
!= ~0UL
1535 || strncmp(secstrings
+ s
->sh_name
,
1538 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1539 | INIT_OFFSET_MASK
);
1540 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1543 mod
->init_text_size
= mod
->init_size
;
1547 static void set_license(struct module
*mod
, const char *license
)
1550 license
= "unspecified";
1552 if (!license_is_gpl_compatible(license
)) {
1553 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1554 printk(KERN_WARNING
"%s: module license '%s' taints "
1555 "kernel.\n", mod
->name
, license
);
1556 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1560 /* Parse tag=value strings from .modinfo section */
1561 static char *next_string(char *string
, unsigned long *secsize
)
1563 /* Skip non-zero chars */
1566 if ((*secsize
)-- <= 1)
1570 /* Skip any zero padding. */
1571 while (!string
[0]) {
1573 if ((*secsize
)-- <= 1)
1579 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1584 unsigned int taglen
= strlen(tag
);
1585 unsigned long size
= sechdrs
[info
].sh_size
;
1587 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1588 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1589 return p
+ taglen
+ 1;
1594 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1595 unsigned int infoindex
)
1597 struct module_attribute
*attr
;
1600 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1603 get_modinfo(sechdrs
,
1609 #ifdef CONFIG_KALLSYMS
1610 static int is_exported(const char *name
, const struct module
*mod
)
1612 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1615 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1622 static char elf_type(const Elf_Sym
*sym
,
1624 const char *secstrings
,
1627 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1628 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1633 if (sym
->st_shndx
== SHN_UNDEF
)
1635 if (sym
->st_shndx
== SHN_ABS
)
1637 if (sym
->st_shndx
>= SHN_LORESERVE
)
1639 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1641 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1642 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1643 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1645 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1650 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1651 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1656 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1657 ".debug", strlen(".debug")) == 0)
1662 static void add_kallsyms(struct module
*mod
,
1664 unsigned int symindex
,
1665 unsigned int strindex
,
1666 const char *secstrings
)
1670 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1671 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1672 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1674 /* Set types up while we still have access to sections. */
1675 for (i
= 0; i
< mod
->num_symtab
; i
++)
1676 mod
->symtab
[i
].st_info
1677 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1680 static inline void add_kallsyms(struct module
*mod
,
1682 unsigned int symindex
,
1683 unsigned int strindex
,
1684 const char *secstrings
)
1687 #endif /* CONFIG_KALLSYMS */
1689 /* Allocate and load the module: note that size of section 0 is always
1690 zero, and we rely on this for optional sections. */
1691 static struct module
*load_module(void __user
*umod
,
1693 const char __user
*uargs
)
1697 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1699 unsigned int symindex
= 0;
1700 unsigned int strindex
= 0;
1701 unsigned int setupindex
;
1702 unsigned int exindex
;
1703 unsigned int exportindex
;
1704 unsigned int modindex
;
1705 unsigned int obsparmindex
;
1706 unsigned int infoindex
;
1707 unsigned int gplindex
;
1708 unsigned int crcindex
;
1709 unsigned int gplcrcindex
;
1710 unsigned int versindex
;
1711 unsigned int pcpuindex
;
1712 unsigned int gplfutureindex
;
1713 unsigned int gplfuturecrcindex
;
1714 unsigned int unwindex
= 0;
1715 unsigned int unusedindex
;
1716 unsigned int unusedcrcindex
;
1717 unsigned int unusedgplindex
;
1718 unsigned int unusedgplcrcindex
;
1719 unsigned int markersindex
;
1720 unsigned int markersstringsindex
;
1723 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1724 struct exception_table_entry
*extable
;
1725 mm_segment_t old_fs
;
1727 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1729 if (len
< sizeof(*hdr
))
1730 return ERR_PTR(-ENOEXEC
);
1732 /* Suck in entire file: we'll want most of it. */
1733 /* vmalloc barfs on "unusual" numbers. Check here */
1734 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1735 return ERR_PTR(-ENOMEM
);
1736 if (copy_from_user(hdr
, umod
, len
) != 0) {
1741 /* Sanity checks against insmoding binaries or wrong arch,
1742 weird elf version */
1743 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1744 || hdr
->e_type
!= ET_REL
1745 || !elf_check_arch(hdr
)
1746 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1751 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1754 /* Convenience variables */
1755 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1756 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1757 sechdrs
[0].sh_addr
= 0;
1759 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1760 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1761 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1764 /* Mark all sections sh_addr with their address in the
1766 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1768 /* Internal symbols and strings. */
1769 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1771 strindex
= sechdrs
[i
].sh_link
;
1772 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1774 #ifndef CONFIG_MODULE_UNLOAD
1775 /* Don't load .exit sections */
1776 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1777 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1781 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1782 ".gnu.linkonce.this_module");
1784 printk(KERN_WARNING
"No module found in object\n");
1788 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1790 if (symindex
== 0) {
1791 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1797 /* Optional sections */
1798 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1799 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1800 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1801 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1802 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1803 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1804 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1805 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1806 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1807 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1808 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1809 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1810 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1811 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1812 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1813 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1814 #ifdef ARCH_UNWIND_SECTION_NAME
1815 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1818 /* Don't keep modinfo section */
1819 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1820 #ifdef CONFIG_KALLSYMS
1821 /* Keep symbol and string tables for decoding later. */
1822 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1823 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1826 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1828 /* Check module struct version now, before we try to use module. */
1829 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1834 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1835 /* This is allowed: modprobe --force will invalidate it. */
1837 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1838 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1840 } else if (!same_magic(modmagic
, vermagic
)) {
1841 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1842 mod
->name
, modmagic
, vermagic
);
1847 /* Now copy in args */
1848 args
= strndup_user(uargs
, ~0UL >> 1);
1850 err
= PTR_ERR(args
);
1854 if (find_module(mod
->name
)) {
1859 mod
->state
= MODULE_STATE_COMING
;
1861 /* Allow arches to frob section contents and sizes. */
1862 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1867 /* We have a special allocation for this section. */
1868 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1869 sechdrs
[pcpuindex
].sh_addralign
,
1875 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1876 mod
->percpu
= percpu
;
1879 /* Determine total sizes, and put offsets in sh_entsize. For now
1880 this is done generically; there doesn't appear to be any
1881 special cases for the architectures. */
1882 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1884 /* Do the allocs. */
1885 ptr
= module_alloc(mod
->core_size
);
1890 memset(ptr
, 0, mod
->core_size
);
1891 mod
->module_core
= ptr
;
1893 ptr
= module_alloc(mod
->init_size
);
1894 if (!ptr
&& mod
->init_size
) {
1898 memset(ptr
, 0, mod
->init_size
);
1899 mod
->module_init
= ptr
;
1901 /* Transfer each section which specifies SHF_ALLOC */
1902 DEBUGP("final section addresses:\n");
1903 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1906 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1909 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1910 dest
= mod
->module_init
1911 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1913 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1915 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1916 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1917 sechdrs
[i
].sh_size
);
1918 /* Update sh_addr to point to copy in image. */
1919 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1920 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1922 /* Module has been moved. */
1923 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1925 /* Now we've moved module, initialize linked lists, etc. */
1926 module_unload_init(mod
);
1928 /* add kobject, so we can reference it. */
1929 err
= mod_sysfs_init(mod
);
1933 /* Set up license info based on the info section */
1934 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1937 * ndiswrapper is under GPL by itself, but loads proprietary modules.
1938 * Don't use add_taint_module(), as it would prevent ndiswrapper from
1939 * using GPL-only symbols it needs.
1941 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1942 add_taint(TAINT_PROPRIETARY_MODULE
);
1944 /* driverloader was caught wrongly pretending to be under GPL */
1945 if (strcmp(mod
->name
, "driverloader") == 0)
1946 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1948 /* Set up MODINFO_ATTR fields */
1949 setup_modinfo(mod
, sechdrs
, infoindex
);
1951 /* Fix up syms, so that st_value is a pointer to location. */
1952 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1957 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1958 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1959 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1961 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1962 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1963 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1965 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1966 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1967 sizeof(*mod
->gpl_future_syms
);
1968 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1969 sizeof(*mod
->unused_syms
);
1970 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1971 sizeof(*mod
->unused_gpl_syms
);
1972 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1973 if (gplfuturecrcindex
)
1974 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1976 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1978 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1979 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1980 if (unusedgplcrcindex
)
1981 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1983 #ifdef CONFIG_MODVERSIONS
1984 if ((mod
->num_syms
&& !crcindex
) ||
1985 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1986 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1987 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1988 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1989 printk(KERN_WARNING
"%s: No versions for exported symbols."
1990 " Tainting kernel.\n", mod
->name
);
1991 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1994 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
1995 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
1996 "__markers_strings");
1998 /* Now do relocations. */
1999 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2000 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2001 unsigned int info
= sechdrs
[i
].sh_info
;
2003 /* Not a valid relocation section? */
2004 if (info
>= hdr
->e_shnum
)
2007 /* Don't bother with non-allocated sections */
2008 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2011 if (sechdrs
[i
].sh_type
== SHT_REL
)
2012 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2013 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2014 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2019 #ifdef CONFIG_MARKERS
2020 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
2022 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
2025 /* Find duplicate symbols */
2026 err
= verify_export_symbols(mod
);
2031 /* Set up and sort exception table */
2032 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
2033 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
2034 sort_extable(extable
, extable
+ mod
->num_exentries
);
2036 /* Finally, copy percpu area over. */
2037 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2038 sechdrs
[pcpuindex
].sh_size
);
2040 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2042 #ifdef CONFIG_MARKERS
2044 marker_update_probe_range(mod
->markers
,
2045 mod
->markers
+ mod
->num_markers
);
2047 err
= module_finalize(hdr
, sechdrs
, mod
);
2051 /* flush the icache in correct context */
2056 * Flush the instruction cache, since we've played with text.
2057 * Do it before processing of module parameters, so the module
2058 * can provide parameter accessor functions of its own.
2060 if (mod
->module_init
)
2061 flush_icache_range((unsigned long)mod
->module_init
,
2062 (unsigned long)mod
->module_init
2064 flush_icache_range((unsigned long)mod
->module_core
,
2065 (unsigned long)mod
->module_core
+ mod
->core_size
);
2071 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2074 /* Now sew it into the lists so we can get lockdep and oops
2075 * info during argument parsing. Noone should access us, since
2076 * strong_try_module_get() will fail. */
2077 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2079 /* Size of section 0 is 0, so this works well if no params */
2080 err
= parse_args(mod
->name
, mod
->args
,
2081 (struct kernel_param
*)
2082 sechdrs
[setupindex
].sh_addr
,
2083 sechdrs
[setupindex
].sh_size
2084 / sizeof(struct kernel_param
),
2089 err
= mod_sysfs_setup(mod
,
2090 (struct kernel_param
*)
2091 sechdrs
[setupindex
].sh_addr
,
2092 sechdrs
[setupindex
].sh_size
2093 / sizeof(struct kernel_param
));
2096 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2097 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2099 /* Size of section 0 is 0, so this works well if no unwind info. */
2100 mod
->unwind_info
= unwind_add_table(mod
,
2101 (void *)sechdrs
[unwindex
].sh_addr
,
2102 sechdrs
[unwindex
].sh_size
);
2104 /* Get rid of temporary copy */
2111 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
2112 module_arch_cleanup(mod
);
2114 kobject_del(&mod
->mkobj
.kobj
);
2115 kobject_put(&mod
->mkobj
.kobj
);
2117 module_unload_free(mod
);
2118 module_free(mod
, mod
->module_init
);
2120 module_free(mod
, mod
->module_core
);
2123 percpu_modfree(percpu
);
2128 return ERR_PTR(err
);
2131 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2136 /* This is where the real work happens */
2138 sys_init_module(void __user
*umod
,
2140 const char __user
*uargs
)
2145 /* Must have permission */
2146 if (!capable(CAP_SYS_MODULE
))
2149 /* Only one module load at a time, please */
2150 if (mutex_lock_interruptible(&module_mutex
) != 0)
2153 /* Do all the hard work */
2154 mod
= load_module(umod
, len
, uargs
);
2156 mutex_unlock(&module_mutex
);
2157 return PTR_ERR(mod
);
2160 /* Drop lock so they can recurse */
2161 mutex_unlock(&module_mutex
);
2163 blocking_notifier_call_chain(&module_notify_list
,
2164 MODULE_STATE_COMING
, mod
);
2166 /* Start the module */
2167 if (mod
->init
!= NULL
)
2170 /* Init routine failed: abort. Try to protect us from
2171 buggy refcounters. */
2172 mod
->state
= MODULE_STATE_GOING
;
2173 synchronize_sched();
2175 mutex_lock(&module_mutex
);
2177 mutex_unlock(&module_mutex
);
2178 wake_up(&module_wq
);
2182 /* Now it's a first class citizen! */
2183 mutex_lock(&module_mutex
);
2184 mod
->state
= MODULE_STATE_LIVE
;
2185 /* Drop initial reference. */
2187 unwind_remove_table(mod
->unwind_info
, 1);
2188 module_free(mod
, mod
->module_init
);
2189 mod
->module_init
= NULL
;
2191 mod
->init_text_size
= 0;
2192 mutex_unlock(&module_mutex
);
2193 wake_up(&module_wq
);
2198 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2200 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2203 #ifdef CONFIG_KALLSYMS
2205 * This ignores the intensely annoying "mapping symbols" found
2206 * in ARM ELF files: $a, $t and $d.
2208 static inline int is_arm_mapping_symbol(const char *str
)
2210 return str
[0] == '$' && strchr("atd", str
[1])
2211 && (str
[2] == '\0' || str
[2] == '.');
2214 static const char *get_ksymbol(struct module
*mod
,
2216 unsigned long *size
,
2217 unsigned long *offset
)
2219 unsigned int i
, best
= 0;
2220 unsigned long nextval
;
2222 /* At worse, next value is at end of module */
2223 if (within(addr
, mod
->module_init
, mod
->init_size
))
2224 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2226 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2228 /* Scan for closest preceeding symbol, and next symbol. (ELF
2229 starts real symbols at 1). */
2230 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2231 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2234 /* We ignore unnamed symbols: they're uninformative
2235 * and inserted at a whim. */
2236 if (mod
->symtab
[i
].st_value
<= addr
2237 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2238 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2239 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2241 if (mod
->symtab
[i
].st_value
> addr
2242 && mod
->symtab
[i
].st_value
< nextval
2243 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2244 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2245 nextval
= mod
->symtab
[i
].st_value
;
2252 *size
= nextval
- mod
->symtab
[best
].st_value
;
2254 *offset
= addr
- mod
->symtab
[best
].st_value
;
2255 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2258 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2259 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2260 const char *module_address_lookup(unsigned long addr
,
2261 unsigned long *size
,
2262 unsigned long *offset
,
2267 const char *ret
= NULL
;
2270 list_for_each_entry(mod
, &modules
, list
) {
2271 if (within(addr
, mod
->module_init
, mod
->init_size
)
2272 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2274 *modname
= mod
->name
;
2275 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2279 /* Make a copy in here where it's safe */
2281 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2288 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2293 list_for_each_entry(mod
, &modules
, list
) {
2294 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2295 within(addr
, mod
->module_core
, mod
->core_size
)) {
2298 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2301 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2311 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2312 unsigned long *offset
, char *modname
, char *name
)
2317 list_for_each_entry(mod
, &modules
, list
) {
2318 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2319 within(addr
, mod
->module_core
, mod
->core_size
)) {
2322 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2326 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2328 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2338 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2339 char *name
, char *module_name
, int *exported
)
2344 list_for_each_entry(mod
, &modules
, list
) {
2345 if (symnum
< mod
->num_symtab
) {
2346 *value
= mod
->symtab
[symnum
].st_value
;
2347 *type
= mod
->symtab
[symnum
].st_info
;
2348 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2350 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2351 *exported
= is_exported(name
, mod
);
2355 symnum
-= mod
->num_symtab
;
2361 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2365 for (i
= 0; i
< mod
->num_symtab
; i
++)
2366 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2367 mod
->symtab
[i
].st_info
!= 'U')
2368 return mod
->symtab
[i
].st_value
;
2372 /* Look for this name: can be of form module:name. */
2373 unsigned long module_kallsyms_lookup_name(const char *name
)
2377 unsigned long ret
= 0;
2379 /* Don't lock: we're in enough trouble already. */
2381 if ((colon
= strchr(name
, ':')) != NULL
) {
2383 if ((mod
= find_module(name
)) != NULL
)
2384 ret
= mod_find_symname(mod
, colon
+1);
2387 list_for_each_entry(mod
, &modules
, list
)
2388 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2394 #endif /* CONFIG_KALLSYMS */
2396 /* Called by the /proc file system to return a list of modules. */
2397 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2399 mutex_lock(&module_mutex
);
2400 return seq_list_start(&modules
, *pos
);
2403 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2405 return seq_list_next(p
, &modules
, pos
);
2408 static void m_stop(struct seq_file
*m
, void *p
)
2410 mutex_unlock(&module_mutex
);
2413 static char *module_flags(struct module
*mod
, char *buf
)
2418 mod
->state
== MODULE_STATE_GOING
||
2419 mod
->state
== MODULE_STATE_COMING
) {
2421 if (mod
->taints
& TAINT_PROPRIETARY_MODULE
)
2423 if (mod
->taints
& TAINT_FORCED_MODULE
)
2426 * TAINT_FORCED_RMMOD: could be added.
2427 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2431 /* Show a - for module-is-being-unloaded */
2432 if (mod
->state
== MODULE_STATE_GOING
)
2434 /* Show a + for module-is-being-loaded */
2435 if (mod
->state
== MODULE_STATE_COMING
)
2444 static int m_show(struct seq_file
*m
, void *p
)
2446 struct module
*mod
= list_entry(p
, struct module
, list
);
2449 seq_printf(m
, "%s %lu",
2450 mod
->name
, mod
->init_size
+ mod
->core_size
);
2451 print_unload_info(m
, mod
);
2453 /* Informative for users. */
2454 seq_printf(m
, " %s",
2455 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2456 mod
->state
== MODULE_STATE_COMING
? "Loading":
2458 /* Used by oprofile and other similar tools. */
2459 seq_printf(m
, " 0x%p", mod
->module_core
);
2463 seq_printf(m
, " %s", module_flags(mod
, buf
));
2465 seq_printf(m
, "\n");
2469 /* Format: modulename size refcount deps address
2471 Where refcount is a number or -, and deps is a comma-separated list
2474 const struct seq_operations modules_op
= {
2481 /* Given an address, look for it in the module exception tables. */
2482 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2484 const struct exception_table_entry
*e
= NULL
;
2488 list_for_each_entry(mod
, &modules
, list
) {
2489 if (mod
->num_exentries
== 0)
2492 e
= search_extable(mod
->extable
,
2493 mod
->extable
+ mod
->num_exentries
- 1,
2500 /* Now, if we found one, we are running inside it now, hence
2501 we cannot unload the module, hence no refcnt needed. */
2506 * Is this a valid module address?
2508 int is_module_address(unsigned long addr
)
2514 list_for_each_entry(mod
, &modules
, list
) {
2515 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2527 /* Is this a valid kernel address? */
2528 struct module
*__module_text_address(unsigned long addr
)
2532 list_for_each_entry(mod
, &modules
, list
)
2533 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2534 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2539 struct module
*module_text_address(unsigned long addr
)
2544 mod
= __module_text_address(addr
);
2550 /* Don't grab lock, we're oopsing. */
2551 void print_modules(void)
2556 printk("Modules linked in:");
2557 list_for_each_entry(mod
, &modules
, list
)
2558 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2559 if (last_unloaded_module
[0])
2560 printk(" [last unloaded: %s]", last_unloaded_module
);
2564 #ifdef CONFIG_MODVERSIONS
2565 /* Generate the signature for struct module here, too, for modversions. */
2566 void struct_module(struct module
*mod
) { return; }
2567 EXPORT_SYMBOL(struct_module
);
2570 #ifdef CONFIG_MARKERS
2571 void module_update_markers(void)
2575 mutex_lock(&module_mutex
);
2576 list_for_each_entry(mod
, &modules
, list
)
2578 marker_update_probe_range(mod
->markers
,
2579 mod
->markers
+ mod
->num_markers
);
2580 mutex_unlock(&module_mutex
);