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/cacheflush.h>
47 #include <linux/license.h>
48 #include <asm/sections.h>
49 #include <linux/tracepoint.h>
50 #include <linux/ftrace.h>
55 #define DEBUGP(fmt , a...)
58 #ifndef ARCH_SHF_SMALL
59 #define ARCH_SHF_SMALL 0
62 /* If this is set, the section belongs in the init part of the module */
63 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
65 /* List of modules, protected by module_mutex or preempt_disable
66 * (add/delete uses stop_machine). */
67 static DEFINE_MUTEX(module_mutex
);
68 static LIST_HEAD(modules
);
70 /* Waiting for a module to finish initializing? */
71 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
73 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
75 /* Bounds of module allocation, for speeding __module_text_address */
76 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
78 int register_module_notifier(struct notifier_block
* nb
)
80 return blocking_notifier_chain_register(&module_notify_list
, nb
);
82 EXPORT_SYMBOL(register_module_notifier
);
84 int unregister_module_notifier(struct notifier_block
* nb
)
86 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
88 EXPORT_SYMBOL(unregister_module_notifier
);
90 /* We require a truly strong try_module_get(): 0 means failure due to
91 ongoing or failed initialization etc. */
92 static inline int strong_try_module_get(struct module
*mod
)
94 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
96 if (try_module_get(mod
))
102 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
109 * A thread that wants to hold a reference to a module only while it
110 * is running can call this to safely exit. nfsd and lockd use this.
112 void __module_put_and_exit(struct module
*mod
, long code
)
117 EXPORT_SYMBOL(__module_put_and_exit
);
119 /* Find a module section: 0 means not found. */
120 static unsigned int find_sec(Elf_Ehdr
*hdr
,
122 const char *secstrings
,
127 for (i
= 1; i
< hdr
->e_shnum
; i
++)
128 /* Alloc bit cleared means "ignore it." */
129 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
130 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
135 /* Provided by the linker */
136 extern const struct kernel_symbol __start___ksymtab
[];
137 extern const struct kernel_symbol __stop___ksymtab
[];
138 extern const struct kernel_symbol __start___ksymtab_gpl
[];
139 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
140 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
141 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
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 #ifdef CONFIG_UNUSED_SYMBOLS
148 extern const struct kernel_symbol __start___ksymtab_unused
[];
149 extern const struct kernel_symbol __stop___ksymtab_unused
[];
150 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
151 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
152 extern const unsigned long __start___kcrctab_unused
[];
153 extern const unsigned long __start___kcrctab_unused_gpl
[];
156 #ifndef CONFIG_MODVERSIONS
157 #define symversion(base, idx) NULL
159 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
163 const struct kernel_symbol
*start
, *stop
;
164 const unsigned long *crcs
;
173 static bool each_symbol_in_section(const struct symsearch
*arr
,
174 unsigned int arrsize
,
175 struct module
*owner
,
176 bool (*fn
)(const struct symsearch
*syms
,
177 struct module
*owner
,
178 unsigned int symnum
, void *data
),
183 for (j
= 0; j
< arrsize
; j
++) {
184 for (i
= 0; i
< arr
[j
].stop
- arr
[j
].start
; i
++)
185 if (fn(&arr
[j
], owner
, i
, data
))
192 /* Returns true as soon as fn returns true, otherwise false. */
193 static bool each_symbol(bool (*fn
)(const struct symsearch
*arr
,
194 struct module
*owner
,
195 unsigned int symnum
, void *data
),
199 const struct symsearch arr
[] = {
200 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
201 NOT_GPL_ONLY
, false },
202 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
203 __start___kcrctab_gpl
,
205 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
206 __start___kcrctab_gpl_future
,
207 WILL_BE_GPL_ONLY
, false },
208 #ifdef CONFIG_UNUSED_SYMBOLS
209 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
210 __start___kcrctab_unused
,
211 NOT_GPL_ONLY
, true },
212 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
213 __start___kcrctab_unused_gpl
,
218 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
221 list_for_each_entry(mod
, &modules
, list
) {
222 struct symsearch arr
[] = {
223 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
224 NOT_GPL_ONLY
, false },
225 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
228 { mod
->gpl_future_syms
,
229 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
230 mod
->gpl_future_crcs
,
231 WILL_BE_GPL_ONLY
, false },
232 #ifdef CONFIG_UNUSED_SYMBOLS
234 mod
->unused_syms
+ mod
->num_unused_syms
,
236 NOT_GPL_ONLY
, true },
237 { mod
->unused_gpl_syms
,
238 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
239 mod
->unused_gpl_crcs
,
244 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
250 struct find_symbol_arg
{
257 struct module
*owner
;
258 const unsigned long *crc
;
262 static bool find_symbol_in_section(const struct symsearch
*syms
,
263 struct module
*owner
,
264 unsigned int symnum
, void *data
)
266 struct find_symbol_arg
*fsa
= data
;
268 if (strcmp(syms
->start
[symnum
].name
, fsa
->name
) != 0)
272 if (syms
->licence
== GPL_ONLY
)
274 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
275 printk(KERN_WARNING
"Symbol %s is being used "
276 "by a non-GPL module, which will not "
277 "be allowed in the future\n", fsa
->name
);
278 printk(KERN_WARNING
"Please see the file "
279 "Documentation/feature-removal-schedule.txt "
280 "in the kernel source tree for more details.\n");
284 #ifdef CONFIG_UNUSED_SYMBOLS
285 if (syms
->unused
&& fsa
->warn
) {
286 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
287 "however this module is using it.\n", fsa
->name
);
289 "This symbol will go away in the future.\n");
291 "Please evalute if this is the right api to use and if "
292 "it really is, submit a report the linux kernel "
293 "mailinglist together with submitting your code for "
299 fsa
->crc
= symversion(syms
->crcs
, symnum
);
300 fsa
->value
= syms
->start
[symnum
].value
;
304 /* Find a symbol, return value, (optional) crc and (optional) module
306 static unsigned long find_symbol(const char *name
,
307 struct module
**owner
,
308 const unsigned long **crc
,
312 struct find_symbol_arg fsa
;
318 if (each_symbol(find_symbol_in_section
, &fsa
)) {
326 DEBUGP("Failed to find symbol %s\n", name
);
330 /* Search for module by name: must hold module_mutex. */
331 static struct module
*find_module(const char *name
)
335 list_for_each_entry(mod
, &modules
, list
) {
336 if (strcmp(mod
->name
, name
) == 0)
343 /* Number of blocks used and allocated. */
344 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
345 /* Size of each block. -ve means used. */
346 static int *pcpu_size
;
348 static int split_block(unsigned int i
, unsigned short size
)
350 /* Reallocation required? */
351 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
354 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
359 pcpu_num_allocated
*= 2;
363 /* Insert a new subblock */
364 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
365 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
368 pcpu_size
[i
+1] -= size
;
373 static inline unsigned int block_size(int val
)
380 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
387 if (align
> PAGE_SIZE
) {
388 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
389 name
, align
, PAGE_SIZE
);
393 ptr
= __per_cpu_start
;
394 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
395 /* Extra for alignment requirement. */
396 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
397 BUG_ON(i
== 0 && extra
!= 0);
399 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
402 /* Transfer extra to previous block. */
403 if (pcpu_size
[i
-1] < 0)
404 pcpu_size
[i
-1] -= extra
;
406 pcpu_size
[i
-1] += extra
;
407 pcpu_size
[i
] -= extra
;
410 /* Split block if warranted */
411 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
412 if (!split_block(i
, size
))
416 pcpu_size
[i
] = -pcpu_size
[i
];
420 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
425 static void percpu_modfree(void *freeme
)
428 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
430 /* First entry is core kernel percpu data. */
431 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
433 pcpu_size
[i
] = -pcpu_size
[i
];
440 /* Merge with previous? */
441 if (pcpu_size
[i
-1] >= 0) {
442 pcpu_size
[i
-1] += pcpu_size
[i
];
444 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
445 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
448 /* Merge with next? */
449 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
450 pcpu_size
[i
] += pcpu_size
[i
+1];
452 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
453 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
457 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
459 const char *secstrings
)
461 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
464 static void percpu_modcopy(void *pcpudest
, const void *from
, unsigned long size
)
468 for_each_possible_cpu(cpu
)
469 memcpy(pcpudest
+ per_cpu_offset(cpu
), from
, size
);
472 static int percpu_modinit(void)
475 pcpu_num_allocated
= 2;
476 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
478 /* Static in-kernel percpu data (used). */
479 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
481 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
482 if (pcpu_size
[1] < 0) {
483 printk(KERN_ERR
"No per-cpu room for modules.\n");
489 __initcall(percpu_modinit
);
490 #else /* ... !CONFIG_SMP */
491 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
496 static inline void percpu_modfree(void *pcpuptr
)
500 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
502 const char *secstrings
)
506 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
509 /* pcpusec should be 0, and size of that section should be 0. */
512 #endif /* CONFIG_SMP */
514 #define MODINFO_ATTR(field) \
515 static void setup_modinfo_##field(struct module *mod, const char *s) \
517 mod->field = kstrdup(s, GFP_KERNEL); \
519 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
520 struct module *mod, char *buffer) \
522 return sprintf(buffer, "%s\n", mod->field); \
524 static int modinfo_##field##_exists(struct module *mod) \
526 return mod->field != NULL; \
528 static void free_modinfo_##field(struct module *mod) \
533 static struct module_attribute modinfo_##field = { \
534 .attr = { .name = __stringify(field), .mode = 0444 }, \
535 .show = show_modinfo_##field, \
536 .setup = setup_modinfo_##field, \
537 .test = modinfo_##field##_exists, \
538 .free = free_modinfo_##field, \
541 MODINFO_ATTR(version
);
542 MODINFO_ATTR(srcversion
);
544 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
546 #ifdef CONFIG_MODULE_UNLOAD
547 /* Init the unload section of the module. */
548 static void module_unload_init(struct module
*mod
)
552 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
553 for (i
= 0; i
< NR_CPUS
; i
++)
554 local_set(&mod
->ref
[i
].count
, 0);
555 /* Hold reference count during initialization. */
556 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
557 /* Backwards compatibility macros put refcount during init. */
558 mod
->waiter
= current
;
561 /* modules using other modules */
564 struct list_head list
;
565 struct module
*module_which_uses
;
568 /* Does a already use b? */
569 static int already_uses(struct module
*a
, struct module
*b
)
571 struct module_use
*use
;
573 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
574 if (use
->module_which_uses
== a
) {
575 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
579 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
583 /* Module a uses b */
584 static int use_module(struct module
*a
, struct module
*b
)
586 struct module_use
*use
;
589 if (b
== NULL
|| already_uses(a
, b
)) return 1;
591 /* If we're interrupted or time out, we fail. */
592 if (wait_event_interruptible_timeout(
593 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
595 printk("%s: gave up waiting for init of module %s.\n",
600 /* If strong_try_module_get() returned a different error, we fail. */
604 DEBUGP("Allocating new usage for %s.\n", a
->name
);
605 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
607 printk("%s: out of memory loading\n", a
->name
);
612 use
->module_which_uses
= a
;
613 list_add(&use
->list
, &b
->modules_which_use_me
);
614 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
618 /* Clear the unload stuff of the module. */
619 static void module_unload_free(struct module
*mod
)
623 list_for_each_entry(i
, &modules
, list
) {
624 struct module_use
*use
;
626 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
627 if (use
->module_which_uses
== mod
) {
628 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
630 list_del(&use
->list
);
632 sysfs_remove_link(i
->holders_dir
, mod
->name
);
633 /* There can be at most one match. */
640 #ifdef CONFIG_MODULE_FORCE_UNLOAD
641 static inline int try_force_unload(unsigned int flags
)
643 int ret
= (flags
& O_TRUNC
);
645 add_taint(TAINT_FORCED_RMMOD
);
649 static inline int try_force_unload(unsigned int flags
)
653 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
662 /* Whole machine is stopped with interrupts off when this runs. */
663 static int __try_stop_module(void *_sref
)
665 struct stopref
*sref
= _sref
;
667 /* If it's not unused, quit unless we're forcing. */
668 if (module_refcount(sref
->mod
) != 0) {
669 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
673 /* Mark it as dying. */
674 sref
->mod
->state
= MODULE_STATE_GOING
;
678 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
680 if (flags
& O_NONBLOCK
) {
681 struct stopref sref
= { mod
, flags
, forced
};
683 return stop_machine(__try_stop_module
, &sref
, NULL
);
685 /* We don't need to stop the machine for this. */
686 mod
->state
= MODULE_STATE_GOING
;
692 unsigned int module_refcount(struct module
*mod
)
694 unsigned int i
, total
= 0;
696 for (i
= 0; i
< NR_CPUS
; i
++)
697 total
+= local_read(&mod
->ref
[i
].count
);
700 EXPORT_SYMBOL(module_refcount
);
702 /* This exists whether we can unload or not */
703 static void free_module(struct module
*mod
);
705 static void wait_for_zero_refcount(struct module
*mod
)
707 /* Since we might sleep for some time, release the mutex first */
708 mutex_unlock(&module_mutex
);
710 DEBUGP("Looking at refcount...\n");
711 set_current_state(TASK_UNINTERRUPTIBLE
);
712 if (module_refcount(mod
) == 0)
716 current
->state
= TASK_RUNNING
;
717 mutex_lock(&module_mutex
);
721 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
724 char name
[MODULE_NAME_LEN
];
727 if (!capable(CAP_SYS_MODULE
))
730 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
732 name
[MODULE_NAME_LEN
-1] = '\0';
734 if (mutex_lock_interruptible(&module_mutex
) != 0)
737 mod
= find_module(name
);
743 if (!list_empty(&mod
->modules_which_use_me
)) {
744 /* Other modules depend on us: get rid of them first. */
749 /* Doing init or already dying? */
750 if (mod
->state
!= MODULE_STATE_LIVE
) {
751 /* FIXME: if (force), slam module count and wake up
753 DEBUGP("%s already dying\n", mod
->name
);
758 /* If it has an init func, it must have an exit func to unload */
759 if (mod
->init
&& !mod
->exit
) {
760 forced
= try_force_unload(flags
);
762 /* This module can't be removed */
768 /* Set this up before setting mod->state */
769 mod
->waiter
= current
;
771 /* Stop the machine so refcounts can't move and disable module. */
772 ret
= try_stop_module(mod
, flags
, &forced
);
776 /* Never wait if forced. */
777 if (!forced
&& module_refcount(mod
) != 0)
778 wait_for_zero_refcount(mod
);
780 mutex_unlock(&module_mutex
);
781 /* Final destruction now noone is using it. */
782 if (mod
->exit
!= NULL
)
784 blocking_notifier_call_chain(&module_notify_list
,
785 MODULE_STATE_GOING
, mod
);
786 mutex_lock(&module_mutex
);
787 /* Store the name of the last unloaded module for diagnostic purposes */
788 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
792 mutex_unlock(&module_mutex
);
796 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
798 struct module_use
*use
;
799 int printed_something
= 0;
801 seq_printf(m
, " %u ", module_refcount(mod
));
803 /* Always include a trailing , so userspace can differentiate
804 between this and the old multi-field proc format. */
805 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
806 printed_something
= 1;
807 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
810 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
811 printed_something
= 1;
812 seq_printf(m
, "[permanent],");
815 if (!printed_something
)
819 void __symbol_put(const char *symbol
)
821 struct module
*owner
;
824 if (IS_ERR_VALUE(find_symbol(symbol
, &owner
, NULL
, true, false)))
829 EXPORT_SYMBOL(__symbol_put
);
831 void symbol_put_addr(void *addr
)
833 struct module
*modaddr
;
835 if (core_kernel_text((unsigned long)addr
))
838 if (!(modaddr
= module_text_address((unsigned long)addr
)))
842 EXPORT_SYMBOL_GPL(symbol_put_addr
);
844 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
845 struct module
*mod
, char *buffer
)
847 return sprintf(buffer
, "%u\n", module_refcount(mod
));
850 static struct module_attribute refcnt
= {
851 .attr
= { .name
= "refcnt", .mode
= 0444 },
855 void module_put(struct module
*module
)
858 unsigned int cpu
= get_cpu();
859 local_dec(&module
->ref
[cpu
].count
);
860 /* Maybe they're waiting for us to drop reference? */
861 if (unlikely(!module_is_live(module
)))
862 wake_up_process(module
->waiter
);
866 EXPORT_SYMBOL(module_put
);
868 #else /* !CONFIG_MODULE_UNLOAD */
869 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
871 /* We don't know the usage count, or what modules are using. */
872 seq_printf(m
, " - -");
875 static inline void module_unload_free(struct module
*mod
)
879 static inline int use_module(struct module
*a
, struct module
*b
)
881 return strong_try_module_get(b
) == 0;
884 static inline void module_unload_init(struct module
*mod
)
887 #endif /* CONFIG_MODULE_UNLOAD */
889 static ssize_t
show_initstate(struct module_attribute
*mattr
,
890 struct module
*mod
, char *buffer
)
892 const char *state
= "unknown";
894 switch (mod
->state
) {
895 case MODULE_STATE_LIVE
:
898 case MODULE_STATE_COMING
:
901 case MODULE_STATE_GOING
:
905 return sprintf(buffer
, "%s\n", state
);
908 static struct module_attribute initstate
= {
909 .attr
= { .name
= "initstate", .mode
= 0444 },
910 .show
= show_initstate
,
913 static struct module_attribute
*modinfo_attrs
[] = {
917 #ifdef CONFIG_MODULE_UNLOAD
923 static const char vermagic
[] = VERMAGIC_STRING
;
925 static int try_to_force_load(struct module
*mod
, const char *symname
)
927 #ifdef CONFIG_MODULE_FORCE_LOAD
928 if (!(tainted
& TAINT_FORCED_MODULE
))
929 printk("%s: no version for \"%s\" found: kernel tainted.\n",
931 add_taint_module(mod
, TAINT_FORCED_MODULE
);
938 #ifdef CONFIG_MODVERSIONS
939 static int check_version(Elf_Shdr
*sechdrs
,
940 unsigned int versindex
,
943 const unsigned long *crc
)
945 unsigned int i
, num_versions
;
946 struct modversion_info
*versions
;
948 /* Exporting module didn't supply crcs? OK, we're already tainted. */
952 /* No versions at all? modprobe --force does this. */
954 return try_to_force_load(mod
, symname
) == 0;
956 versions
= (void *) sechdrs
[versindex
].sh_addr
;
957 num_versions
= sechdrs
[versindex
].sh_size
958 / sizeof(struct modversion_info
);
960 for (i
= 0; i
< num_versions
; i
++) {
961 if (strcmp(versions
[i
].name
, symname
) != 0)
964 if (versions
[i
].crc
== *crc
)
966 DEBUGP("Found checksum %lX vs module %lX\n",
967 *crc
, versions
[i
].crc
);
971 printk(KERN_WARNING
"%s: no symbol version for %s\n",
976 printk("%s: disagrees about version of symbol %s\n",
981 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
982 unsigned int versindex
,
985 const unsigned long *crc
;
987 if (IS_ERR_VALUE(find_symbol("struct_module", NULL
, &crc
, true, false)))
989 return check_version(sechdrs
, versindex
, "struct_module", mod
, crc
);
992 /* First part is kernel version, which we ignore if module has crcs. */
993 static inline int same_magic(const char *amagic
, const char *bmagic
,
997 amagic
+= strcspn(amagic
, " ");
998 bmagic
+= strcspn(bmagic
, " ");
1000 return strcmp(amagic
, bmagic
) == 0;
1003 static inline int check_version(Elf_Shdr
*sechdrs
,
1004 unsigned int versindex
,
1005 const char *symname
,
1007 const unsigned long *crc
)
1012 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1013 unsigned int versindex
,
1019 static inline int same_magic(const char *amagic
, const char *bmagic
,
1022 return strcmp(amagic
, bmagic
) == 0;
1024 #endif /* CONFIG_MODVERSIONS */
1026 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1027 Must be holding module_mutex. */
1028 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
1029 unsigned int versindex
,
1033 struct module
*owner
;
1035 const unsigned long *crc
;
1037 ret
= find_symbol(name
, &owner
, &crc
,
1038 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
), true);
1039 if (!IS_ERR_VALUE(ret
)) {
1040 /* use_module can fail due to OOM,
1041 or module initialization or unloading */
1042 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
1043 !use_module(mod
, owner
))
1050 * /sys/module/foo/sections stuff
1051 * J. Corbet <corbet@lwn.net>
1053 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1054 struct module_sect_attr
1056 struct module_attribute mattr
;
1058 unsigned long address
;
1061 struct module_sect_attrs
1063 struct attribute_group grp
;
1064 unsigned int nsections
;
1065 struct module_sect_attr attrs
[0];
1068 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1069 struct module
*mod
, char *buf
)
1071 struct module_sect_attr
*sattr
=
1072 container_of(mattr
, struct module_sect_attr
, mattr
);
1073 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1076 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1078 unsigned int section
;
1080 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1081 kfree(sect_attrs
->attrs
[section
].name
);
1085 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1086 char *secstrings
, Elf_Shdr
*sechdrs
)
1088 unsigned int nloaded
= 0, i
, size
[2];
1089 struct module_sect_attrs
*sect_attrs
;
1090 struct module_sect_attr
*sattr
;
1091 struct attribute
**gattr
;
1093 /* Count loaded sections and allocate structures */
1094 for (i
= 0; i
< nsect
; i
++)
1095 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1097 size
[0] = ALIGN(sizeof(*sect_attrs
)
1098 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1099 sizeof(sect_attrs
->grp
.attrs
[0]));
1100 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1101 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1102 if (sect_attrs
== NULL
)
1105 /* Setup section attributes. */
1106 sect_attrs
->grp
.name
= "sections";
1107 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1109 sect_attrs
->nsections
= 0;
1110 sattr
= §_attrs
->attrs
[0];
1111 gattr
= §_attrs
->grp
.attrs
[0];
1112 for (i
= 0; i
< nsect
; i
++) {
1113 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1115 sattr
->address
= sechdrs
[i
].sh_addr
;
1116 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1118 if (sattr
->name
== NULL
)
1120 sect_attrs
->nsections
++;
1121 sattr
->mattr
.show
= module_sect_show
;
1122 sattr
->mattr
.store
= NULL
;
1123 sattr
->mattr
.attr
.name
= sattr
->name
;
1124 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1125 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1129 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1132 mod
->sect_attrs
= sect_attrs
;
1135 free_sect_attrs(sect_attrs
);
1138 static void remove_sect_attrs(struct module
*mod
)
1140 if (mod
->sect_attrs
) {
1141 sysfs_remove_group(&mod
->mkobj
.kobj
,
1142 &mod
->sect_attrs
->grp
);
1143 /* We are positive that no one is using any sect attrs
1144 * at this point. Deallocate immediately. */
1145 free_sect_attrs(mod
->sect_attrs
);
1146 mod
->sect_attrs
= NULL
;
1151 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1154 struct module_notes_attrs
{
1155 struct kobject
*dir
;
1157 struct bin_attribute attrs
[0];
1160 static ssize_t
module_notes_read(struct kobject
*kobj
,
1161 struct bin_attribute
*bin_attr
,
1162 char *buf
, loff_t pos
, size_t count
)
1165 * The caller checked the pos and count against our size.
1167 memcpy(buf
, bin_attr
->private + pos
, count
);
1171 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1174 if (notes_attrs
->dir
) {
1176 sysfs_remove_bin_file(notes_attrs
->dir
,
1177 ¬es_attrs
->attrs
[i
]);
1178 kobject_del(notes_attrs
->dir
);
1183 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1184 char *secstrings
, Elf_Shdr
*sechdrs
)
1186 unsigned int notes
, loaded
, i
;
1187 struct module_notes_attrs
*notes_attrs
;
1188 struct bin_attribute
*nattr
;
1190 /* Count notes sections and allocate structures. */
1192 for (i
= 0; i
< nsect
; i
++)
1193 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1194 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1200 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1201 + notes
* sizeof(notes_attrs
->attrs
[0]),
1203 if (notes_attrs
== NULL
)
1206 notes_attrs
->notes
= notes
;
1207 nattr
= ¬es_attrs
->attrs
[0];
1208 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1209 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1211 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1212 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1213 nattr
->attr
.mode
= S_IRUGO
;
1214 nattr
->size
= sechdrs
[i
].sh_size
;
1215 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1216 nattr
->read
= module_notes_read
;
1222 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1223 if (!notes_attrs
->dir
)
1226 for (i
= 0; i
< notes
; ++i
)
1227 if (sysfs_create_bin_file(notes_attrs
->dir
,
1228 ¬es_attrs
->attrs
[i
]))
1231 mod
->notes_attrs
= notes_attrs
;
1235 free_notes_attrs(notes_attrs
, i
);
1238 static void remove_notes_attrs(struct module
*mod
)
1240 if (mod
->notes_attrs
)
1241 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1246 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1247 char *sectstrings
, Elf_Shdr
*sechdrs
)
1251 static inline void remove_sect_attrs(struct module
*mod
)
1255 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1256 char *sectstrings
, Elf_Shdr
*sechdrs
)
1260 static inline void remove_notes_attrs(struct module
*mod
)
1266 int module_add_modinfo_attrs(struct module
*mod
)
1268 struct module_attribute
*attr
;
1269 struct module_attribute
*temp_attr
;
1273 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1274 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1276 if (!mod
->modinfo_attrs
)
1279 temp_attr
= mod
->modinfo_attrs
;
1280 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1282 (attr
->test
&& attr
->test(mod
))) {
1283 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1284 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1291 void module_remove_modinfo_attrs(struct module
*mod
)
1293 struct module_attribute
*attr
;
1296 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1297 /* pick a field to test for end of list */
1298 if (!attr
->attr
.name
)
1300 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1304 kfree(mod
->modinfo_attrs
);
1307 int mod_sysfs_init(struct module
*mod
)
1310 struct kobject
*kobj
;
1312 if (!module_sysfs_initialized
) {
1313 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1319 kobj
= kset_find_obj(module_kset
, mod
->name
);
1321 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1327 mod
->mkobj
.mod
= mod
;
1329 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1330 mod
->mkobj
.kobj
.kset
= module_kset
;
1331 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1334 kobject_put(&mod
->mkobj
.kobj
);
1336 /* delay uevent until full sysfs population */
1341 int mod_sysfs_setup(struct module
*mod
,
1342 struct kernel_param
*kparam
,
1343 unsigned int num_params
)
1347 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1348 if (!mod
->holders_dir
) {
1353 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1355 goto out_unreg_holders
;
1357 err
= module_add_modinfo_attrs(mod
);
1359 goto out_unreg_param
;
1361 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1365 module_param_sysfs_remove(mod
);
1367 kobject_put(mod
->holders_dir
);
1369 kobject_put(&mod
->mkobj
.kobj
);
1373 static void mod_sysfs_fini(struct module
*mod
)
1375 kobject_put(&mod
->mkobj
.kobj
);
1378 #else /* CONFIG_SYSFS */
1380 static void mod_sysfs_fini(struct module
*mod
)
1384 #endif /* CONFIG_SYSFS */
1386 static void mod_kobject_remove(struct module
*mod
)
1388 module_remove_modinfo_attrs(mod
);
1389 module_param_sysfs_remove(mod
);
1390 kobject_put(mod
->mkobj
.drivers_dir
);
1391 kobject_put(mod
->holders_dir
);
1392 mod_sysfs_fini(mod
);
1396 * link the module with the whole machine is stopped with interrupts off
1397 * - this defends against kallsyms not taking locks
1399 static int __link_module(void *_mod
)
1401 struct module
*mod
= _mod
;
1402 list_add(&mod
->list
, &modules
);
1407 * unlink the module with the whole machine is stopped with interrupts off
1408 * - this defends against kallsyms not taking locks
1410 static int __unlink_module(void *_mod
)
1412 struct module
*mod
= _mod
;
1413 list_del(&mod
->list
);
1417 /* Free a module, remove from lists, etc (must hold module_mutex). */
1418 static void free_module(struct module
*mod
)
1420 /* Delete from various lists */
1421 stop_machine(__unlink_module
, mod
, NULL
);
1422 remove_notes_attrs(mod
);
1423 remove_sect_attrs(mod
);
1424 mod_kobject_remove(mod
);
1426 unwind_remove_table(mod
->unwind_info
, 0);
1428 /* Arch-specific cleanup. */
1429 module_arch_cleanup(mod
);
1431 /* Module unload stuff */
1432 module_unload_free(mod
);
1434 /* release any pointers to mcount in this module */
1435 ftrace_release(mod
->module_core
, mod
->core_size
);
1437 /* This may be NULL, but that's OK */
1438 module_free(mod
, mod
->module_init
);
1441 percpu_modfree(mod
->percpu
);
1443 /* Free lock-classes: */
1444 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1446 /* Finally, free the core (containing the module structure) */
1447 module_free(mod
, mod
->module_core
);
1450 void *__symbol_get(const char *symbol
)
1452 struct module
*owner
;
1453 unsigned long value
;
1456 value
= find_symbol(symbol
, &owner
, NULL
, true, true);
1457 if (IS_ERR_VALUE(value
))
1459 else if (strong_try_module_get(owner
))
1463 return (void *)value
;
1465 EXPORT_SYMBOL_GPL(__symbol_get
);
1468 * Ensure that an exported symbol [global namespace] does not already exist
1469 * in the kernel or in some other module's exported symbol table.
1471 static int verify_export_symbols(struct module
*mod
)
1474 struct module
*owner
;
1475 const struct kernel_symbol
*s
;
1477 const struct kernel_symbol
*sym
;
1480 { mod
->syms
, mod
->num_syms
},
1481 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1482 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1483 #ifdef CONFIG_UNUSED_SYMBOLS
1484 { mod
->unused_syms
, mod
->num_unused_syms
},
1485 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1489 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1490 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1491 if (!IS_ERR_VALUE(find_symbol(s
->name
, &owner
,
1492 NULL
, true, false))) {
1494 "%s: exports duplicate symbol %s"
1496 mod
->name
, s
->name
, module_name(owner
));
1504 /* Change all symbols so that st_value encodes the pointer directly. */
1505 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1506 unsigned int symindex
,
1508 unsigned int versindex
,
1509 unsigned int pcpuindex
,
1512 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1513 unsigned long secbase
;
1514 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1517 for (i
= 1; i
< n
; i
++) {
1518 switch (sym
[i
].st_shndx
) {
1520 /* We compiled with -fno-common. These are not
1521 supposed to happen. */
1522 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1523 printk("%s: please compile with -fno-common\n",
1529 /* Don't need to do anything */
1530 DEBUGP("Absolute symbol: 0x%08lx\n",
1531 (long)sym
[i
].st_value
);
1536 = resolve_symbol(sechdrs
, versindex
,
1537 strtab
+ sym
[i
].st_name
, mod
);
1539 /* Ok if resolved. */
1540 if (!IS_ERR_VALUE(sym
[i
].st_value
))
1543 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1546 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1547 mod
->name
, strtab
+ sym
[i
].st_name
);
1552 /* Divert to percpu allocation if a percpu var. */
1553 if (sym
[i
].st_shndx
== pcpuindex
)
1554 secbase
= (unsigned long)mod
->percpu
;
1556 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1557 sym
[i
].st_value
+= secbase
;
1565 /* Update size with this section: return offset. */
1566 static long get_offset(unsigned int *size
, Elf_Shdr
*sechdr
)
1570 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1571 *size
= ret
+ sechdr
->sh_size
;
1575 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1576 might -- code, read-only data, read-write data, small data. Tally
1577 sizes, and place the offsets into sh_entsize fields: high bit means it
1579 static void layout_sections(struct module
*mod
,
1580 const Elf_Ehdr
*hdr
,
1582 const char *secstrings
)
1584 static unsigned long const masks
[][2] = {
1585 /* NOTE: all executable code must be the first section
1586 * in this array; otherwise modify the text_size
1587 * finder in the two loops below */
1588 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1589 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1590 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1591 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1595 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1596 sechdrs
[i
].sh_entsize
= ~0UL;
1598 DEBUGP("Core section allocation order:\n");
1599 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1600 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1601 Elf_Shdr
*s
= &sechdrs
[i
];
1603 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1604 || (s
->sh_flags
& masks
[m
][1])
1605 || s
->sh_entsize
!= ~0UL
1606 || strncmp(secstrings
+ s
->sh_name
,
1609 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1610 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1613 mod
->core_text_size
= mod
->core_size
;
1616 DEBUGP("Init section allocation order:\n");
1617 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1618 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1619 Elf_Shdr
*s
= &sechdrs
[i
];
1621 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1622 || (s
->sh_flags
& masks
[m
][1])
1623 || s
->sh_entsize
!= ~0UL
1624 || strncmp(secstrings
+ s
->sh_name
,
1627 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1628 | INIT_OFFSET_MASK
);
1629 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1632 mod
->init_text_size
= mod
->init_size
;
1636 static void set_license(struct module
*mod
, const char *license
)
1639 license
= "unspecified";
1641 if (!license_is_gpl_compatible(license
)) {
1642 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1643 printk(KERN_WARNING
"%s: module license '%s' taints "
1644 "kernel.\n", mod
->name
, license
);
1645 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1649 /* Parse tag=value strings from .modinfo section */
1650 static char *next_string(char *string
, unsigned long *secsize
)
1652 /* Skip non-zero chars */
1655 if ((*secsize
)-- <= 1)
1659 /* Skip any zero padding. */
1660 while (!string
[0]) {
1662 if ((*secsize
)-- <= 1)
1668 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1673 unsigned int taglen
= strlen(tag
);
1674 unsigned long size
= sechdrs
[info
].sh_size
;
1676 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1677 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1678 return p
+ taglen
+ 1;
1683 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1684 unsigned int infoindex
)
1686 struct module_attribute
*attr
;
1689 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1692 get_modinfo(sechdrs
,
1698 #ifdef CONFIG_KALLSYMS
1700 /* lookup symbol in given range of kernel_symbols */
1701 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1702 const struct kernel_symbol
*start
,
1703 const struct kernel_symbol
*stop
)
1705 const struct kernel_symbol
*ks
= start
;
1706 for (; ks
< stop
; ks
++)
1707 if (strcmp(ks
->name
, name
) == 0)
1712 static int is_exported(const char *name
, const struct module
*mod
)
1714 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1717 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1724 static char elf_type(const Elf_Sym
*sym
,
1726 const char *secstrings
,
1729 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1730 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1735 if (sym
->st_shndx
== SHN_UNDEF
)
1737 if (sym
->st_shndx
== SHN_ABS
)
1739 if (sym
->st_shndx
>= SHN_LORESERVE
)
1741 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1743 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1744 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1745 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1747 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1752 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1753 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1758 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1759 ".debug", strlen(".debug")) == 0)
1764 static void add_kallsyms(struct module
*mod
,
1766 unsigned int symindex
,
1767 unsigned int strindex
,
1768 const char *secstrings
)
1772 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1773 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1774 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1776 /* Set types up while we still have access to sections. */
1777 for (i
= 0; i
< mod
->num_symtab
; i
++)
1778 mod
->symtab
[i
].st_info
1779 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1782 static inline void add_kallsyms(struct module
*mod
,
1784 unsigned int symindex
,
1785 unsigned int strindex
,
1786 const char *secstrings
)
1789 #endif /* CONFIG_KALLSYMS */
1791 static void *module_alloc_update_bounds(unsigned long size
)
1793 void *ret
= module_alloc(size
);
1796 /* Update module bounds. */
1797 if ((unsigned long)ret
< module_addr_min
)
1798 module_addr_min
= (unsigned long)ret
;
1799 if ((unsigned long)ret
+ size
> module_addr_max
)
1800 module_addr_max
= (unsigned long)ret
+ size
;
1805 /* Allocate and load the module: note that size of section 0 is always
1806 zero, and we rely on this for optional sections. */
1807 static noinline
struct module
*load_module(void __user
*umod
,
1809 const char __user
*uargs
)
1813 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1815 unsigned int symindex
= 0;
1816 unsigned int strindex
= 0;
1817 unsigned int setupindex
;
1818 unsigned int exindex
;
1819 unsigned int exportindex
;
1820 unsigned int modindex
;
1821 unsigned int obsparmindex
;
1822 unsigned int infoindex
;
1823 unsigned int gplindex
;
1824 unsigned int crcindex
;
1825 unsigned int gplcrcindex
;
1826 unsigned int versindex
;
1827 unsigned int pcpuindex
;
1828 unsigned int gplfutureindex
;
1829 unsigned int gplfuturecrcindex
;
1830 unsigned int unwindex
= 0;
1831 #ifdef CONFIG_UNUSED_SYMBOLS
1832 unsigned int unusedindex
;
1833 unsigned int unusedcrcindex
;
1834 unsigned int unusedgplindex
;
1835 unsigned int unusedgplcrcindex
;
1837 unsigned int markersindex
;
1838 unsigned int markersstringsindex
;
1839 unsigned int tracepointsindex
;
1840 unsigned int tracepointsstringsindex
;
1841 unsigned int mcountindex
;
1844 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1846 struct exception_table_entry
*extable
;
1847 mm_segment_t old_fs
;
1849 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1851 if (len
< sizeof(*hdr
))
1852 return ERR_PTR(-ENOEXEC
);
1854 /* Suck in entire file: we'll want most of it. */
1855 /* vmalloc barfs on "unusual" numbers. Check here */
1856 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1857 return ERR_PTR(-ENOMEM
);
1858 if (copy_from_user(hdr
, umod
, len
) != 0) {
1863 /* Sanity checks against insmoding binaries or wrong arch,
1864 weird elf version */
1865 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
1866 || hdr
->e_type
!= ET_REL
1867 || !elf_check_arch(hdr
)
1868 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1873 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1876 /* Convenience variables */
1877 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1878 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1879 sechdrs
[0].sh_addr
= 0;
1881 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1882 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1883 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1886 /* Mark all sections sh_addr with their address in the
1888 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1890 /* Internal symbols and strings. */
1891 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1893 strindex
= sechdrs
[i
].sh_link
;
1894 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1896 #ifndef CONFIG_MODULE_UNLOAD
1897 /* Don't load .exit sections */
1898 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1899 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1903 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1904 ".gnu.linkonce.this_module");
1906 printk(KERN_WARNING
"No module found in object\n");
1910 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1912 if (symindex
== 0) {
1913 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1919 /* Optional sections */
1920 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1921 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1922 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1923 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1924 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1925 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1926 #ifdef CONFIG_UNUSED_SYMBOLS
1927 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1928 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1929 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1930 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1932 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1933 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1934 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1935 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1936 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1937 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1938 #ifdef ARCH_UNWIND_SECTION_NAME
1939 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1942 /* Don't keep modinfo and version sections. */
1943 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1944 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1945 #ifdef CONFIG_KALLSYMS
1946 /* Keep symbol and string tables for decoding later. */
1947 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1948 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1951 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1953 /* Check module struct version now, before we try to use module. */
1954 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1959 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1960 /* This is allowed: modprobe --force will invalidate it. */
1962 err
= try_to_force_load(mod
, "magic");
1965 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
1966 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1967 mod
->name
, modmagic
, vermagic
);
1972 /* Now copy in args */
1973 args
= strndup_user(uargs
, ~0UL >> 1);
1975 err
= PTR_ERR(args
);
1979 if (find_module(mod
->name
)) {
1984 mod
->state
= MODULE_STATE_COMING
;
1986 /* Allow arches to frob section contents and sizes. */
1987 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1992 /* We have a special allocation for this section. */
1993 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1994 sechdrs
[pcpuindex
].sh_addralign
,
2000 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2001 mod
->percpu
= percpu
;
2004 /* Determine total sizes, and put offsets in sh_entsize. For now
2005 this is done generically; there doesn't appear to be any
2006 special cases for the architectures. */
2007 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2009 /* Do the allocs. */
2010 ptr
= module_alloc_update_bounds(mod
->core_size
);
2015 memset(ptr
, 0, mod
->core_size
);
2016 mod
->module_core
= ptr
;
2018 ptr
= module_alloc_update_bounds(mod
->init_size
);
2019 if (!ptr
&& mod
->init_size
) {
2023 memset(ptr
, 0, mod
->init_size
);
2024 mod
->module_init
= ptr
;
2026 /* Transfer each section which specifies SHF_ALLOC */
2027 DEBUGP("final section addresses:\n");
2028 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2031 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2034 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2035 dest
= mod
->module_init
2036 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2038 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2040 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2041 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2042 sechdrs
[i
].sh_size
);
2043 /* Update sh_addr to point to copy in image. */
2044 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2045 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2047 /* Module has been moved. */
2048 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2050 /* Now we've moved module, initialize linked lists, etc. */
2051 module_unload_init(mod
);
2053 /* add kobject, so we can reference it. */
2054 err
= mod_sysfs_init(mod
);
2058 /* Set up license info based on the info section */
2059 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2062 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2063 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2064 * using GPL-only symbols it needs.
2066 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2067 add_taint(TAINT_PROPRIETARY_MODULE
);
2069 /* driverloader was caught wrongly pretending to be under GPL */
2070 if (strcmp(mod
->name
, "driverloader") == 0)
2071 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2073 /* Set up MODINFO_ATTR fields */
2074 setup_modinfo(mod
, sechdrs
, infoindex
);
2076 /* Fix up syms, so that st_value is a pointer to location. */
2077 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2082 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
2083 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
2084 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
2086 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
2087 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
2088 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
2090 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
2091 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
2092 sizeof(*mod
->gpl_future_syms
);
2093 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
2094 if (gplfuturecrcindex
)
2095 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
2097 #ifdef CONFIG_UNUSED_SYMBOLS
2098 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
2099 sizeof(*mod
->unused_syms
);
2100 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
2101 sizeof(*mod
->unused_gpl_syms
);
2102 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
2104 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
2105 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
2106 if (unusedgplcrcindex
)
2107 mod
->unused_gpl_crcs
2108 = (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
2111 #ifdef CONFIG_MODVERSIONS
2112 if ((mod
->num_syms
&& !crcindex
)
2113 || (mod
->num_gpl_syms
&& !gplcrcindex
)
2114 || (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
)
2115 #ifdef CONFIG_UNUSED_SYMBOLS
2116 || (mod
->num_unused_syms
&& !unusedcrcindex
)
2117 || (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)
2120 printk(KERN_WARNING
"%s: No versions for exported symbols.\n", mod
->name
);
2121 err
= try_to_force_load(mod
, "nocrc");
2126 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
2127 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
2128 "__markers_strings");
2129 tracepointsindex
= find_sec(hdr
, sechdrs
, secstrings
, "__tracepoints");
2130 tracepointsstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
2131 "__tracepoints_strings");
2133 mcountindex
= find_sec(hdr
, sechdrs
, secstrings
,
2136 /* Now do relocations. */
2137 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2138 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2139 unsigned int info
= sechdrs
[i
].sh_info
;
2141 /* Not a valid relocation section? */
2142 if (info
>= hdr
->e_shnum
)
2145 /* Don't bother with non-allocated sections */
2146 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2149 if (sechdrs
[i
].sh_type
== SHT_REL
)
2150 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2151 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2152 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2157 #ifdef CONFIG_MARKERS
2158 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
2160 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
2162 #ifdef CONFIG_TRACEPOINTS
2163 mod
->tracepoints
= (void *)sechdrs
[tracepointsindex
].sh_addr
;
2164 mod
->num_tracepoints
=
2165 sechdrs
[tracepointsindex
].sh_size
/ sizeof(*mod
->tracepoints
);
2169 /* Find duplicate symbols */
2170 err
= verify_export_symbols(mod
);
2175 /* Set up and sort exception table */
2176 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
2177 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
2178 sort_extable(extable
, extable
+ mod
->num_exentries
);
2180 /* Finally, copy percpu area over. */
2181 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2182 sechdrs
[pcpuindex
].sh_size
);
2184 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2187 #ifdef CONFIG_MARKERS
2188 marker_update_probe_range(mod
->markers
,
2189 mod
->markers
+ mod
->num_markers
);
2191 #ifdef CONFIG_TRACEPOINTS
2192 tracepoint_update_probe_range(mod
->tracepoints
,
2193 mod
->tracepoints
+ mod
->num_tracepoints
);
2197 /* sechdrs[0].sh_size is always zero */
2198 mseg
= (void *)sechdrs
[mcountindex
].sh_addr
;
2199 ftrace_init_module(mseg
, mseg
+ sechdrs
[mcountindex
].sh_size
);
2201 err
= module_finalize(hdr
, sechdrs
, mod
);
2205 /* flush the icache in correct context */
2210 * Flush the instruction cache, since we've played with text.
2211 * Do it before processing of module parameters, so the module
2212 * can provide parameter accessor functions of its own.
2214 if (mod
->module_init
)
2215 flush_icache_range((unsigned long)mod
->module_init
,
2216 (unsigned long)mod
->module_init
2218 flush_icache_range((unsigned long)mod
->module_core
,
2219 (unsigned long)mod
->module_core
+ mod
->core_size
);
2225 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2228 /* Now sew it into the lists so we can get lockdep and oops
2229 * info during argument parsing. Noone should access us, since
2230 * strong_try_module_get() will fail. */
2231 stop_machine(__link_module
, mod
, NULL
);
2233 /* Size of section 0 is 0, so this works well if no params */
2234 err
= parse_args(mod
->name
, mod
->args
,
2235 (struct kernel_param
*)
2236 sechdrs
[setupindex
].sh_addr
,
2237 sechdrs
[setupindex
].sh_size
2238 / sizeof(struct kernel_param
),
2243 err
= mod_sysfs_setup(mod
,
2244 (struct kernel_param
*)
2245 sechdrs
[setupindex
].sh_addr
,
2246 sechdrs
[setupindex
].sh_size
2247 / sizeof(struct kernel_param
));
2250 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2251 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2253 /* Size of section 0 is 0, so this works well if no unwind info. */
2254 mod
->unwind_info
= unwind_add_table(mod
,
2255 (void *)sechdrs
[unwindex
].sh_addr
,
2256 sechdrs
[unwindex
].sh_size
);
2258 /* Get rid of temporary copy */
2265 stop_machine(__unlink_module
, mod
, NULL
);
2266 module_arch_cleanup(mod
);
2268 kobject_del(&mod
->mkobj
.kobj
);
2269 kobject_put(&mod
->mkobj
.kobj
);
2270 ftrace_release(mod
->module_core
, mod
->core_size
);
2272 module_unload_free(mod
);
2273 module_free(mod
, mod
->module_init
);
2275 module_free(mod
, mod
->module_core
);
2278 percpu_modfree(percpu
);
2283 return ERR_PTR(err
);
2286 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2291 /* This is where the real work happens */
2293 sys_init_module(void __user
*umod
,
2295 const char __user
*uargs
)
2300 /* Must have permission */
2301 if (!capable(CAP_SYS_MODULE
))
2304 /* Only one module load at a time, please */
2305 if (mutex_lock_interruptible(&module_mutex
) != 0)
2308 /* Do all the hard work */
2309 mod
= load_module(umod
, len
, uargs
);
2311 mutex_unlock(&module_mutex
);
2312 return PTR_ERR(mod
);
2315 /* Drop lock so they can recurse */
2316 mutex_unlock(&module_mutex
);
2318 blocking_notifier_call_chain(&module_notify_list
,
2319 MODULE_STATE_COMING
, mod
);
2321 /* Start the module */
2322 if (mod
->init
!= NULL
)
2323 ret
= do_one_initcall(mod
->init
);
2325 /* Init routine failed: abort. Try to protect us from
2326 buggy refcounters. */
2327 mod
->state
= MODULE_STATE_GOING
;
2328 synchronize_sched();
2330 blocking_notifier_call_chain(&module_notify_list
,
2331 MODULE_STATE_GOING
, mod
);
2332 mutex_lock(&module_mutex
);
2334 mutex_unlock(&module_mutex
);
2335 wake_up(&module_wq
);
2339 printk(KERN_WARNING
"%s: '%s'->init suspiciously returned %d, "
2340 "it should follow 0/-E convention\n"
2341 KERN_WARNING
"%s: loading module anyway...\n",
2342 __func__
, mod
->name
, ret
,
2347 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2348 mod
->state
= MODULE_STATE_LIVE
;
2349 wake_up(&module_wq
);
2351 mutex_lock(&module_mutex
);
2352 /* Drop initial reference. */
2354 unwind_remove_table(mod
->unwind_info
, 1);
2355 module_free(mod
, mod
->module_init
);
2356 mod
->module_init
= NULL
;
2358 mod
->init_text_size
= 0;
2359 mutex_unlock(&module_mutex
);
2364 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2366 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2369 #ifdef CONFIG_KALLSYMS
2371 * This ignores the intensely annoying "mapping symbols" found
2372 * in ARM ELF files: $a, $t and $d.
2374 static inline int is_arm_mapping_symbol(const char *str
)
2376 return str
[0] == '$' && strchr("atd", str
[1])
2377 && (str
[2] == '\0' || str
[2] == '.');
2380 static const char *get_ksymbol(struct module
*mod
,
2382 unsigned long *size
,
2383 unsigned long *offset
)
2385 unsigned int i
, best
= 0;
2386 unsigned long nextval
;
2388 /* At worse, next value is at end of module */
2389 if (within(addr
, mod
->module_init
, mod
->init_size
))
2390 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2392 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2394 /* Scan for closest preceeding symbol, and next symbol. (ELF
2395 starts real symbols at 1). */
2396 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2397 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2400 /* We ignore unnamed symbols: they're uninformative
2401 * and inserted at a whim. */
2402 if (mod
->symtab
[i
].st_value
<= addr
2403 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2404 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2405 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2407 if (mod
->symtab
[i
].st_value
> addr
2408 && mod
->symtab
[i
].st_value
< nextval
2409 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2410 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2411 nextval
= mod
->symtab
[i
].st_value
;
2418 *size
= nextval
- mod
->symtab
[best
].st_value
;
2420 *offset
= addr
- mod
->symtab
[best
].st_value
;
2421 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2424 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2425 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2426 const char *module_address_lookup(unsigned long addr
,
2427 unsigned long *size
,
2428 unsigned long *offset
,
2433 const char *ret
= NULL
;
2436 list_for_each_entry(mod
, &modules
, list
) {
2437 if (within(addr
, mod
->module_init
, mod
->init_size
)
2438 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2440 *modname
= mod
->name
;
2441 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2445 /* Make a copy in here where it's safe */
2447 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2454 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2459 list_for_each_entry(mod
, &modules
, list
) {
2460 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2461 within(addr
, mod
->module_core
, mod
->core_size
)) {
2464 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2467 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2477 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2478 unsigned long *offset
, char *modname
, char *name
)
2483 list_for_each_entry(mod
, &modules
, list
) {
2484 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2485 within(addr
, mod
->module_core
, mod
->core_size
)) {
2488 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2492 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2494 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2504 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2505 char *name
, char *module_name
, int *exported
)
2510 list_for_each_entry(mod
, &modules
, list
) {
2511 if (symnum
< mod
->num_symtab
) {
2512 *value
= mod
->symtab
[symnum
].st_value
;
2513 *type
= mod
->symtab
[symnum
].st_info
;
2514 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2516 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2517 *exported
= is_exported(name
, mod
);
2521 symnum
-= mod
->num_symtab
;
2527 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2531 for (i
= 0; i
< mod
->num_symtab
; i
++)
2532 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2533 mod
->symtab
[i
].st_info
!= 'U')
2534 return mod
->symtab
[i
].st_value
;
2538 /* Look for this name: can be of form module:name. */
2539 unsigned long module_kallsyms_lookup_name(const char *name
)
2543 unsigned long ret
= 0;
2545 /* Don't lock: we're in enough trouble already. */
2547 if ((colon
= strchr(name
, ':')) != NULL
) {
2549 if ((mod
= find_module(name
)) != NULL
)
2550 ret
= mod_find_symname(mod
, colon
+1);
2553 list_for_each_entry(mod
, &modules
, list
)
2554 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2560 #endif /* CONFIG_KALLSYMS */
2562 /* Called by the /proc file system to return a list of modules. */
2563 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2565 mutex_lock(&module_mutex
);
2566 return seq_list_start(&modules
, *pos
);
2569 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2571 return seq_list_next(p
, &modules
, pos
);
2574 static void m_stop(struct seq_file
*m
, void *p
)
2576 mutex_unlock(&module_mutex
);
2579 static char *module_flags(struct module
*mod
, char *buf
)
2584 mod
->state
== MODULE_STATE_GOING
||
2585 mod
->state
== MODULE_STATE_COMING
) {
2587 if (mod
->taints
& TAINT_PROPRIETARY_MODULE
)
2589 if (mod
->taints
& TAINT_FORCED_MODULE
)
2592 * TAINT_FORCED_RMMOD: could be added.
2593 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2597 /* Show a - for module-is-being-unloaded */
2598 if (mod
->state
== MODULE_STATE_GOING
)
2600 /* Show a + for module-is-being-loaded */
2601 if (mod
->state
== MODULE_STATE_COMING
)
2610 static int m_show(struct seq_file
*m
, void *p
)
2612 struct module
*mod
= list_entry(p
, struct module
, list
);
2615 seq_printf(m
, "%s %u",
2616 mod
->name
, mod
->init_size
+ mod
->core_size
);
2617 print_unload_info(m
, mod
);
2619 /* Informative for users. */
2620 seq_printf(m
, " %s",
2621 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2622 mod
->state
== MODULE_STATE_COMING
? "Loading":
2624 /* Used by oprofile and other similar tools. */
2625 seq_printf(m
, " 0x%p", mod
->module_core
);
2629 seq_printf(m
, " %s", module_flags(mod
, buf
));
2631 seq_printf(m
, "\n");
2635 /* Format: modulename size refcount deps address
2637 Where refcount is a number or -, and deps is a comma-separated list
2640 const struct seq_operations modules_op
= {
2647 /* Given an address, look for it in the module exception tables. */
2648 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2650 const struct exception_table_entry
*e
= NULL
;
2654 list_for_each_entry(mod
, &modules
, list
) {
2655 if (mod
->num_exentries
== 0)
2658 e
= search_extable(mod
->extable
,
2659 mod
->extable
+ mod
->num_exentries
- 1,
2666 /* Now, if we found one, we are running inside it now, hence
2667 we cannot unload the module, hence no refcnt needed. */
2672 * Is this a valid module address?
2674 int is_module_address(unsigned long addr
)
2680 list_for_each_entry(mod
, &modules
, list
) {
2681 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2693 /* Is this a valid kernel address? */
2694 struct module
*__module_text_address(unsigned long addr
)
2698 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2701 list_for_each_entry(mod
, &modules
, list
)
2702 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2703 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2708 struct module
*module_text_address(unsigned long addr
)
2713 mod
= __module_text_address(addr
);
2719 /* Don't grab lock, we're oopsing. */
2720 void print_modules(void)
2725 printk("Modules linked in:");
2726 list_for_each_entry(mod
, &modules
, list
)
2727 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2728 if (last_unloaded_module
[0])
2729 printk(" [last unloaded: %s]", last_unloaded_module
);
2733 #ifdef CONFIG_MODVERSIONS
2734 /* Generate the signature for struct module here, too, for modversions. */
2735 void struct_module(struct module
*mod
) { return; }
2736 EXPORT_SYMBOL(struct_module
);
2739 #ifdef CONFIG_MARKERS
2740 void module_update_markers(void)
2744 mutex_lock(&module_mutex
);
2745 list_for_each_entry(mod
, &modules
, list
)
2747 marker_update_probe_range(mod
->markers
,
2748 mod
->markers
+ mod
->num_markers
);
2749 mutex_unlock(&module_mutex
);
2753 #ifdef CONFIG_TRACEPOINTS
2754 void module_update_tracepoints(void)
2758 mutex_lock(&module_mutex
);
2759 list_for_each_entry(mod
, &modules
, list
)
2761 tracepoint_update_probe_range(mod
->tracepoints
,
2762 mod
->tracepoints
+ mod
->num_tracepoints
);
2763 mutex_unlock(&module_mutex
);
2767 * Returns 0 if current not found.
2768 * Returns 1 if current found.
2770 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
2772 struct module
*iter_mod
;
2775 mutex_lock(&module_mutex
);
2776 list_for_each_entry(iter_mod
, &modules
, list
) {
2777 if (!iter_mod
->taints
) {
2779 * Sorted module list
2781 if (iter_mod
< iter
->module
)
2783 else if (iter_mod
> iter
->module
)
2784 iter
->tracepoint
= NULL
;
2785 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
2786 iter_mod
->tracepoints
,
2787 iter_mod
->tracepoints
2788 + iter_mod
->num_tracepoints
);
2790 iter
->module
= iter_mod
;
2795 mutex_unlock(&module_mutex
);