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>
53 #define DEBUGP(fmt , a...)
56 #ifndef ARCH_SHF_SMALL
57 #define ARCH_SHF_SMALL 0
60 /* If this is set, the section belongs in the init part of the module */
61 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
63 /* List of modules, protected by module_mutex or preempt_disable
64 * (add/delete uses stop_machine). */
65 static DEFINE_MUTEX(module_mutex
);
66 static LIST_HEAD(modules
);
68 /* Waiting for a module to finish initializing? */
69 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
71 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
73 /* Bounds of module allocation, for speeding __module_text_address */
74 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
76 int register_module_notifier(struct notifier_block
* nb
)
78 return blocking_notifier_chain_register(&module_notify_list
, nb
);
80 EXPORT_SYMBOL(register_module_notifier
);
82 int unregister_module_notifier(struct notifier_block
* nb
)
84 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
86 EXPORT_SYMBOL(unregister_module_notifier
);
88 /* We require a truly strong try_module_get(): 0 means failure due to
89 ongoing or failed initialization etc. */
90 static inline int strong_try_module_get(struct module
*mod
)
92 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
94 if (try_module_get(mod
))
100 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
103 mod
->taints
|= (1U << flag
);
107 * A thread that wants to hold a reference to a module only while it
108 * is running can call this to safely exit. nfsd and lockd use this.
110 void __module_put_and_exit(struct module
*mod
, long code
)
115 EXPORT_SYMBOL(__module_put_and_exit
);
117 /* Find a module section: 0 means not found. */
118 static unsigned int find_sec(Elf_Ehdr
*hdr
,
120 const char *secstrings
,
125 for (i
= 1; i
< hdr
->e_shnum
; i
++)
126 /* Alloc bit cleared means "ignore it." */
127 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
128 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
133 /* Provided by the linker */
134 extern const struct kernel_symbol __start___ksymtab
[];
135 extern const struct kernel_symbol __stop___ksymtab
[];
136 extern const struct kernel_symbol __start___ksymtab_gpl
[];
137 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
138 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
139 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
140 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
141 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
142 extern const unsigned long __start___kcrctab
[];
143 extern const unsigned long __start___kcrctab_gpl
[];
144 extern const unsigned long __start___kcrctab_gpl_future
[];
145 #ifdef CONFIG_UNUSED_SYMBOLS
146 extern const struct kernel_symbol __start___ksymtab_unused
[];
147 extern const struct kernel_symbol __stop___ksymtab_unused
[];
148 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
149 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
150 extern const unsigned long __start___kcrctab_unused
[];
151 extern const unsigned long __start___kcrctab_unused_gpl
[];
154 #ifndef CONFIG_MODVERSIONS
155 #define symversion(base, idx) NULL
157 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
161 const struct kernel_symbol
*start
, *stop
;
162 const unsigned long *crcs
;
171 static bool each_symbol_in_section(const struct symsearch
*arr
,
172 unsigned int arrsize
,
173 struct module
*owner
,
174 bool (*fn
)(const struct symsearch
*syms
,
175 struct module
*owner
,
176 unsigned int symnum
, void *data
),
181 for (j
= 0; j
< arrsize
; j
++) {
182 for (i
= 0; i
< arr
[j
].stop
- arr
[j
].start
; i
++)
183 if (fn(&arr
[j
], owner
, i
, data
))
190 /* Returns true as soon as fn returns true, otherwise false. */
191 static bool each_symbol(bool (*fn
)(const struct symsearch
*arr
,
192 struct module
*owner
,
193 unsigned int symnum
, void *data
),
197 const struct symsearch arr
[] = {
198 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
199 NOT_GPL_ONLY
, false },
200 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
201 __start___kcrctab_gpl
,
203 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
204 __start___kcrctab_gpl_future
,
205 WILL_BE_GPL_ONLY
, false },
206 #ifdef CONFIG_UNUSED_SYMBOLS
207 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
208 __start___kcrctab_unused
,
209 NOT_GPL_ONLY
, true },
210 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
211 __start___kcrctab_unused_gpl
,
216 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
219 list_for_each_entry(mod
, &modules
, list
) {
220 struct symsearch arr
[] = {
221 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
222 NOT_GPL_ONLY
, false },
223 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
226 { mod
->gpl_future_syms
,
227 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
228 mod
->gpl_future_crcs
,
229 WILL_BE_GPL_ONLY
, false },
230 #ifdef CONFIG_UNUSED_SYMBOLS
232 mod
->unused_syms
+ mod
->num_unused_syms
,
234 NOT_GPL_ONLY
, true },
235 { mod
->unused_gpl_syms
,
236 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
237 mod
->unused_gpl_crcs
,
242 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
248 struct find_symbol_arg
{
255 struct module
*owner
;
256 const unsigned long *crc
;
260 static bool find_symbol_in_section(const struct symsearch
*syms
,
261 struct module
*owner
,
262 unsigned int symnum
, void *data
)
264 struct find_symbol_arg
*fsa
= data
;
266 if (strcmp(syms
->start
[symnum
].name
, fsa
->name
) != 0)
270 if (syms
->licence
== GPL_ONLY
)
272 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
273 printk(KERN_WARNING
"Symbol %s is being used "
274 "by a non-GPL module, which will not "
275 "be allowed in the future\n", fsa
->name
);
276 printk(KERN_WARNING
"Please see the file "
277 "Documentation/feature-removal-schedule.txt "
278 "in the kernel source tree for more details.\n");
282 #ifdef CONFIG_UNUSED_SYMBOLS
283 if (syms
->unused
&& fsa
->warn
) {
284 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
285 "however this module is using it.\n", fsa
->name
);
287 "This symbol will go away in the future.\n");
289 "Please evalute if this is the right api to use and if "
290 "it really is, submit a report the linux kernel "
291 "mailinglist together with submitting your code for "
297 fsa
->crc
= symversion(syms
->crcs
, symnum
);
298 fsa
->value
= syms
->start
[symnum
].value
;
302 /* Find a symbol, return value, (optional) crc and (optional) module
304 static unsigned long find_symbol(const char *name
,
305 struct module
**owner
,
306 const unsigned long **crc
,
310 struct find_symbol_arg fsa
;
316 if (each_symbol(find_symbol_in_section
, &fsa
)) {
324 DEBUGP("Failed to find symbol %s\n", name
);
328 /* Search for module by name: must hold module_mutex. */
329 static struct module
*find_module(const char *name
)
333 list_for_each_entry(mod
, &modules
, list
) {
334 if (strcmp(mod
->name
, name
) == 0)
341 /* Number of blocks used and allocated. */
342 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
343 /* Size of each block. -ve means used. */
344 static int *pcpu_size
;
346 static int split_block(unsigned int i
, unsigned short size
)
348 /* Reallocation required? */
349 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
352 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
357 pcpu_num_allocated
*= 2;
361 /* Insert a new subblock */
362 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
363 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
366 pcpu_size
[i
+1] -= size
;
371 static inline unsigned int block_size(int val
)
378 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
385 if (align
> PAGE_SIZE
) {
386 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
387 name
, align
, PAGE_SIZE
);
391 ptr
= __per_cpu_start
;
392 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
393 /* Extra for alignment requirement. */
394 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
395 BUG_ON(i
== 0 && extra
!= 0);
397 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
400 /* Transfer extra to previous block. */
401 if (pcpu_size
[i
-1] < 0)
402 pcpu_size
[i
-1] -= extra
;
404 pcpu_size
[i
-1] += extra
;
405 pcpu_size
[i
] -= extra
;
408 /* Split block if warranted */
409 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
410 if (!split_block(i
, size
))
414 pcpu_size
[i
] = -pcpu_size
[i
];
418 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
423 static void percpu_modfree(void *freeme
)
426 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
428 /* First entry is core kernel percpu data. */
429 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
431 pcpu_size
[i
] = -pcpu_size
[i
];
438 /* Merge with previous? */
439 if (pcpu_size
[i
-1] >= 0) {
440 pcpu_size
[i
-1] += pcpu_size
[i
];
442 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
443 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
446 /* Merge with next? */
447 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
448 pcpu_size
[i
] += pcpu_size
[i
+1];
450 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
451 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
455 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
457 const char *secstrings
)
459 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
462 static void percpu_modcopy(void *pcpudest
, const void *from
, unsigned long size
)
466 for_each_possible_cpu(cpu
)
467 memcpy(pcpudest
+ per_cpu_offset(cpu
), from
, size
);
470 static int percpu_modinit(void)
473 pcpu_num_allocated
= 2;
474 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
476 /* Static in-kernel percpu data (used). */
477 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
479 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
480 if (pcpu_size
[1] < 0) {
481 printk(KERN_ERR
"No per-cpu room for modules.\n");
487 __initcall(percpu_modinit
);
488 #else /* ... !CONFIG_SMP */
489 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
494 static inline void percpu_modfree(void *pcpuptr
)
498 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
500 const char *secstrings
)
504 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
507 /* pcpusec should be 0, and size of that section should be 0. */
510 #endif /* CONFIG_SMP */
512 #define MODINFO_ATTR(field) \
513 static void setup_modinfo_##field(struct module *mod, const char *s) \
515 mod->field = kstrdup(s, GFP_KERNEL); \
517 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
518 struct module *mod, char *buffer) \
520 return sprintf(buffer, "%s\n", mod->field); \
522 static int modinfo_##field##_exists(struct module *mod) \
524 return mod->field != NULL; \
526 static void free_modinfo_##field(struct module *mod) \
531 static struct module_attribute modinfo_##field = { \
532 .attr = { .name = __stringify(field), .mode = 0444 }, \
533 .show = show_modinfo_##field, \
534 .setup = setup_modinfo_##field, \
535 .test = modinfo_##field##_exists, \
536 .free = free_modinfo_##field, \
539 MODINFO_ATTR(version
);
540 MODINFO_ATTR(srcversion
);
542 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
544 #ifdef CONFIG_MODULE_UNLOAD
545 /* Init the unload section of the module. */
546 static void module_unload_init(struct module
*mod
)
550 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
551 for (i
= 0; i
< NR_CPUS
; i
++)
552 local_set(&mod
->ref
[i
].count
, 0);
553 /* Hold reference count during initialization. */
554 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
555 /* Backwards compatibility macros put refcount during init. */
556 mod
->waiter
= current
;
559 /* modules using other modules */
562 struct list_head list
;
563 struct module
*module_which_uses
;
566 /* Does a already use b? */
567 static int already_uses(struct module
*a
, struct module
*b
)
569 struct module_use
*use
;
571 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
572 if (use
->module_which_uses
== a
) {
573 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
577 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
581 /* Module a uses b */
582 static int use_module(struct module
*a
, struct module
*b
)
584 struct module_use
*use
;
587 if (b
== NULL
|| already_uses(a
, b
)) return 1;
589 /* If we're interrupted or time out, we fail. */
590 if (wait_event_interruptible_timeout(
591 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
593 printk("%s: gave up waiting for init of module %s.\n",
598 /* If strong_try_module_get() returned a different error, we fail. */
602 DEBUGP("Allocating new usage for %s.\n", a
->name
);
603 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
605 printk("%s: out of memory loading\n", a
->name
);
610 use
->module_which_uses
= a
;
611 list_add(&use
->list
, &b
->modules_which_use_me
);
612 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
616 /* Clear the unload stuff of the module. */
617 static void module_unload_free(struct module
*mod
)
621 list_for_each_entry(i
, &modules
, list
) {
622 struct module_use
*use
;
624 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
625 if (use
->module_which_uses
== mod
) {
626 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
628 list_del(&use
->list
);
630 sysfs_remove_link(i
->holders_dir
, mod
->name
);
631 /* There can be at most one match. */
638 #ifdef CONFIG_MODULE_FORCE_UNLOAD
639 static inline int try_force_unload(unsigned int flags
)
641 int ret
= (flags
& O_TRUNC
);
643 add_taint(TAINT_FORCED_RMMOD
);
647 static inline int try_force_unload(unsigned int flags
)
651 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
660 /* Whole machine is stopped with interrupts off when this runs. */
661 static int __try_stop_module(void *_sref
)
663 struct stopref
*sref
= _sref
;
665 /* If it's not unused, quit unless we're forcing. */
666 if (module_refcount(sref
->mod
) != 0) {
667 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
671 /* Mark it as dying. */
672 sref
->mod
->state
= MODULE_STATE_GOING
;
676 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
678 if (flags
& O_NONBLOCK
) {
679 struct stopref sref
= { mod
, flags
, forced
};
681 return stop_machine(__try_stop_module
, &sref
, NULL
);
683 /* We don't need to stop the machine for this. */
684 mod
->state
= MODULE_STATE_GOING
;
690 unsigned int module_refcount(struct module
*mod
)
692 unsigned int i
, total
= 0;
694 for (i
= 0; i
< NR_CPUS
; i
++)
695 total
+= local_read(&mod
->ref
[i
].count
);
698 EXPORT_SYMBOL(module_refcount
);
700 /* This exists whether we can unload or not */
701 static void free_module(struct module
*mod
);
703 static void wait_for_zero_refcount(struct module
*mod
)
705 /* Since we might sleep for some time, release the mutex first */
706 mutex_unlock(&module_mutex
);
708 DEBUGP("Looking at refcount...\n");
709 set_current_state(TASK_UNINTERRUPTIBLE
);
710 if (module_refcount(mod
) == 0)
714 current
->state
= TASK_RUNNING
;
715 mutex_lock(&module_mutex
);
719 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
722 char name
[MODULE_NAME_LEN
];
725 if (!capable(CAP_SYS_MODULE
))
728 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
730 name
[MODULE_NAME_LEN
-1] = '\0';
732 if (mutex_lock_interruptible(&module_mutex
) != 0)
735 mod
= find_module(name
);
741 if (!list_empty(&mod
->modules_which_use_me
)) {
742 /* Other modules depend on us: get rid of them first. */
747 /* Doing init or already dying? */
748 if (mod
->state
!= MODULE_STATE_LIVE
) {
749 /* FIXME: if (force), slam module count and wake up
751 DEBUGP("%s already dying\n", mod
->name
);
756 /* If it has an init func, it must have an exit func to unload */
757 if (mod
->init
&& !mod
->exit
) {
758 forced
= try_force_unload(flags
);
760 /* This module can't be removed */
766 /* Set this up before setting mod->state */
767 mod
->waiter
= current
;
769 /* Stop the machine so refcounts can't move and disable module. */
770 ret
= try_stop_module(mod
, flags
, &forced
);
774 /* Never wait if forced. */
775 if (!forced
&& module_refcount(mod
) != 0)
776 wait_for_zero_refcount(mod
);
778 mutex_unlock(&module_mutex
);
779 /* Final destruction now noone is using it. */
780 if (mod
->exit
!= NULL
)
782 blocking_notifier_call_chain(&module_notify_list
,
783 MODULE_STATE_GOING
, mod
);
784 mutex_lock(&module_mutex
);
785 /* Store the name of the last unloaded module for diagnostic purposes */
786 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
787 unregister_dynamic_debug_module(mod
->name
);
791 mutex_unlock(&module_mutex
);
795 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
797 struct module_use
*use
;
798 int printed_something
= 0;
800 seq_printf(m
, " %u ", module_refcount(mod
));
802 /* Always include a trailing , so userspace can differentiate
803 between this and the old multi-field proc format. */
804 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
805 printed_something
= 1;
806 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
809 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
810 printed_something
= 1;
811 seq_printf(m
, "[permanent],");
814 if (!printed_something
)
818 void __symbol_put(const char *symbol
)
820 struct module
*owner
;
823 if (IS_ERR_VALUE(find_symbol(symbol
, &owner
, NULL
, true, false)))
828 EXPORT_SYMBOL(__symbol_put
);
830 void symbol_put_addr(void *addr
)
832 struct module
*modaddr
;
834 if (core_kernel_text((unsigned long)addr
))
837 if (!(modaddr
= module_text_address((unsigned long)addr
)))
841 EXPORT_SYMBOL_GPL(symbol_put_addr
);
843 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
844 struct module
*mod
, char *buffer
)
846 return sprintf(buffer
, "%u\n", module_refcount(mod
));
849 static struct module_attribute refcnt
= {
850 .attr
= { .name
= "refcnt", .mode
= 0444 },
854 void module_put(struct module
*module
)
857 unsigned int cpu
= get_cpu();
858 local_dec(&module
->ref
[cpu
].count
);
859 /* Maybe they're waiting for us to drop reference? */
860 if (unlikely(!module_is_live(module
)))
861 wake_up_process(module
->waiter
);
865 EXPORT_SYMBOL(module_put
);
867 #else /* !CONFIG_MODULE_UNLOAD */
868 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
870 /* We don't know the usage count, or what modules are using. */
871 seq_printf(m
, " - -");
874 static inline void module_unload_free(struct module
*mod
)
878 static inline int use_module(struct module
*a
, struct module
*b
)
880 return strong_try_module_get(b
) == 0;
883 static inline void module_unload_init(struct module
*mod
)
886 #endif /* CONFIG_MODULE_UNLOAD */
888 static ssize_t
show_initstate(struct module_attribute
*mattr
,
889 struct module
*mod
, char *buffer
)
891 const char *state
= "unknown";
893 switch (mod
->state
) {
894 case MODULE_STATE_LIVE
:
897 case MODULE_STATE_COMING
:
900 case MODULE_STATE_GOING
:
904 return sprintf(buffer
, "%s\n", state
);
907 static struct module_attribute initstate
= {
908 .attr
= { .name
= "initstate", .mode
= 0444 },
909 .show
= show_initstate
,
912 static struct module_attribute
*modinfo_attrs
[] = {
916 #ifdef CONFIG_MODULE_UNLOAD
922 static const char vermagic
[] = VERMAGIC_STRING
;
924 static int try_to_force_load(struct module
*mod
, const char *symname
)
926 #ifdef CONFIG_MODULE_FORCE_LOAD
927 if (!test_taint(TAINT_FORCED_MODULE
))
928 printk("%s: no version for \"%s\" found: kernel tainted.\n",
930 add_taint_module(mod
, TAINT_FORCED_MODULE
);
937 #ifdef CONFIG_MODVERSIONS
938 static int check_version(Elf_Shdr
*sechdrs
,
939 unsigned int versindex
,
942 const unsigned long *crc
)
944 unsigned int i
, num_versions
;
945 struct modversion_info
*versions
;
947 /* Exporting module didn't supply crcs? OK, we're already tainted. */
951 /* No versions at all? modprobe --force does this. */
953 return try_to_force_load(mod
, symname
) == 0;
955 versions
= (void *) sechdrs
[versindex
].sh_addr
;
956 num_versions
= sechdrs
[versindex
].sh_size
957 / sizeof(struct modversion_info
);
959 for (i
= 0; i
< num_versions
; i
++) {
960 if (strcmp(versions
[i
].name
, symname
) != 0)
963 if (versions
[i
].crc
== *crc
)
965 DEBUGP("Found checksum %lX vs module %lX\n",
966 *crc
, versions
[i
].crc
);
970 printk(KERN_WARNING
"%s: no symbol version for %s\n",
975 printk("%s: disagrees about version of symbol %s\n",
980 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
981 unsigned int versindex
,
984 const unsigned long *crc
;
986 if (IS_ERR_VALUE(find_symbol("struct_module", NULL
, &crc
, true, false)))
988 return check_version(sechdrs
, versindex
, "struct_module", mod
, crc
);
991 /* First part is kernel version, which we ignore if module has crcs. */
992 static inline int same_magic(const char *amagic
, const char *bmagic
,
996 amagic
+= strcspn(amagic
, " ");
997 bmagic
+= strcspn(bmagic
, " ");
999 return strcmp(amagic
, bmagic
) == 0;
1002 static inline int check_version(Elf_Shdr
*sechdrs
,
1003 unsigned int versindex
,
1004 const char *symname
,
1006 const unsigned long *crc
)
1011 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1012 unsigned int versindex
,
1018 static inline int same_magic(const char *amagic
, const char *bmagic
,
1021 return strcmp(amagic
, bmagic
) == 0;
1023 #endif /* CONFIG_MODVERSIONS */
1025 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1026 Must be holding module_mutex. */
1027 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
1028 unsigned int versindex
,
1032 struct module
*owner
;
1034 const unsigned long *crc
;
1036 ret
= find_symbol(name
, &owner
, &crc
,
1037 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1038 if (!IS_ERR_VALUE(ret
)) {
1039 /* use_module can fail due to OOM,
1040 or module initialization or unloading */
1041 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
1042 !use_module(mod
, owner
))
1049 * /sys/module/foo/sections stuff
1050 * J. Corbet <corbet@lwn.net>
1052 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1053 struct module_sect_attr
1055 struct module_attribute mattr
;
1057 unsigned long address
;
1060 struct module_sect_attrs
1062 struct attribute_group grp
;
1063 unsigned int nsections
;
1064 struct module_sect_attr attrs
[0];
1067 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1068 struct module
*mod
, char *buf
)
1070 struct module_sect_attr
*sattr
=
1071 container_of(mattr
, struct module_sect_attr
, mattr
);
1072 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1075 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1077 unsigned int section
;
1079 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1080 kfree(sect_attrs
->attrs
[section
].name
);
1084 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1085 char *secstrings
, Elf_Shdr
*sechdrs
)
1087 unsigned int nloaded
= 0, i
, size
[2];
1088 struct module_sect_attrs
*sect_attrs
;
1089 struct module_sect_attr
*sattr
;
1090 struct attribute
**gattr
;
1092 /* Count loaded sections and allocate structures */
1093 for (i
= 0; i
< nsect
; i
++)
1094 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1096 size
[0] = ALIGN(sizeof(*sect_attrs
)
1097 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1098 sizeof(sect_attrs
->grp
.attrs
[0]));
1099 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1100 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1101 if (sect_attrs
== NULL
)
1104 /* Setup section attributes. */
1105 sect_attrs
->grp
.name
= "sections";
1106 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1108 sect_attrs
->nsections
= 0;
1109 sattr
= §_attrs
->attrs
[0];
1110 gattr
= §_attrs
->grp
.attrs
[0];
1111 for (i
= 0; i
< nsect
; i
++) {
1112 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1114 sattr
->address
= sechdrs
[i
].sh_addr
;
1115 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1117 if (sattr
->name
== NULL
)
1119 sect_attrs
->nsections
++;
1120 sattr
->mattr
.show
= module_sect_show
;
1121 sattr
->mattr
.store
= NULL
;
1122 sattr
->mattr
.attr
.name
= sattr
->name
;
1123 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1124 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1128 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1131 mod
->sect_attrs
= sect_attrs
;
1134 free_sect_attrs(sect_attrs
);
1137 static void remove_sect_attrs(struct module
*mod
)
1139 if (mod
->sect_attrs
) {
1140 sysfs_remove_group(&mod
->mkobj
.kobj
,
1141 &mod
->sect_attrs
->grp
);
1142 /* We are positive that no one is using any sect attrs
1143 * at this point. Deallocate immediately. */
1144 free_sect_attrs(mod
->sect_attrs
);
1145 mod
->sect_attrs
= NULL
;
1150 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1153 struct module_notes_attrs
{
1154 struct kobject
*dir
;
1156 struct bin_attribute attrs
[0];
1159 static ssize_t
module_notes_read(struct kobject
*kobj
,
1160 struct bin_attribute
*bin_attr
,
1161 char *buf
, loff_t pos
, size_t count
)
1164 * The caller checked the pos and count against our size.
1166 memcpy(buf
, bin_attr
->private + pos
, count
);
1170 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1173 if (notes_attrs
->dir
) {
1175 sysfs_remove_bin_file(notes_attrs
->dir
,
1176 ¬es_attrs
->attrs
[i
]);
1177 kobject_put(notes_attrs
->dir
);
1182 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1183 char *secstrings
, Elf_Shdr
*sechdrs
)
1185 unsigned int notes
, loaded
, i
;
1186 struct module_notes_attrs
*notes_attrs
;
1187 struct bin_attribute
*nattr
;
1189 /* Count notes sections and allocate structures. */
1191 for (i
= 0; i
< nsect
; i
++)
1192 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1193 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1199 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1200 + notes
* sizeof(notes_attrs
->attrs
[0]),
1202 if (notes_attrs
== NULL
)
1205 notes_attrs
->notes
= notes
;
1206 nattr
= ¬es_attrs
->attrs
[0];
1207 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1208 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1210 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1211 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1212 nattr
->attr
.mode
= S_IRUGO
;
1213 nattr
->size
= sechdrs
[i
].sh_size
;
1214 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1215 nattr
->read
= module_notes_read
;
1221 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1222 if (!notes_attrs
->dir
)
1225 for (i
= 0; i
< notes
; ++i
)
1226 if (sysfs_create_bin_file(notes_attrs
->dir
,
1227 ¬es_attrs
->attrs
[i
]))
1230 mod
->notes_attrs
= notes_attrs
;
1234 free_notes_attrs(notes_attrs
, i
);
1237 static void remove_notes_attrs(struct module
*mod
)
1239 if (mod
->notes_attrs
)
1240 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1245 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1246 char *sectstrings
, Elf_Shdr
*sechdrs
)
1250 static inline void remove_sect_attrs(struct module
*mod
)
1254 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1255 char *sectstrings
, Elf_Shdr
*sechdrs
)
1259 static inline void remove_notes_attrs(struct module
*mod
)
1265 int module_add_modinfo_attrs(struct module
*mod
)
1267 struct module_attribute
*attr
;
1268 struct module_attribute
*temp_attr
;
1272 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1273 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1275 if (!mod
->modinfo_attrs
)
1278 temp_attr
= mod
->modinfo_attrs
;
1279 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1281 (attr
->test
&& attr
->test(mod
))) {
1282 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1283 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1290 void module_remove_modinfo_attrs(struct module
*mod
)
1292 struct module_attribute
*attr
;
1295 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1296 /* pick a field to test for end of list */
1297 if (!attr
->attr
.name
)
1299 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1303 kfree(mod
->modinfo_attrs
);
1306 int mod_sysfs_init(struct module
*mod
)
1309 struct kobject
*kobj
;
1311 if (!module_sysfs_initialized
) {
1312 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1318 kobj
= kset_find_obj(module_kset
, mod
->name
);
1320 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1326 mod
->mkobj
.mod
= mod
;
1328 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1329 mod
->mkobj
.kobj
.kset
= module_kset
;
1330 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1333 kobject_put(&mod
->mkobj
.kobj
);
1335 /* delay uevent until full sysfs population */
1340 int mod_sysfs_setup(struct module
*mod
,
1341 struct kernel_param
*kparam
,
1342 unsigned int num_params
)
1346 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1347 if (!mod
->holders_dir
) {
1352 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1354 goto out_unreg_holders
;
1356 err
= module_add_modinfo_attrs(mod
);
1358 goto out_unreg_param
;
1360 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1364 module_param_sysfs_remove(mod
);
1366 kobject_put(mod
->holders_dir
);
1368 kobject_put(&mod
->mkobj
.kobj
);
1372 static void mod_sysfs_fini(struct module
*mod
)
1374 kobject_put(&mod
->mkobj
.kobj
);
1377 #else /* CONFIG_SYSFS */
1379 static void mod_sysfs_fini(struct module
*mod
)
1383 #endif /* CONFIG_SYSFS */
1385 static void mod_kobject_remove(struct module
*mod
)
1387 module_remove_modinfo_attrs(mod
);
1388 module_param_sysfs_remove(mod
);
1389 kobject_put(mod
->mkobj
.drivers_dir
);
1390 kobject_put(mod
->holders_dir
);
1391 mod_sysfs_fini(mod
);
1395 * link the module with the whole machine is stopped with interrupts off
1396 * - this defends against kallsyms not taking locks
1398 static int __link_module(void *_mod
)
1400 struct module
*mod
= _mod
;
1401 list_add(&mod
->list
, &modules
);
1406 * unlink the module with the whole machine is stopped with interrupts off
1407 * - this defends against kallsyms not taking locks
1409 static int __unlink_module(void *_mod
)
1411 struct module
*mod
= _mod
;
1412 list_del(&mod
->list
);
1416 /* Free a module, remove from lists, etc (must hold module_mutex). */
1417 static void free_module(struct module
*mod
)
1419 /* Delete from various lists */
1420 stop_machine(__unlink_module
, mod
, NULL
);
1421 remove_notes_attrs(mod
);
1422 remove_sect_attrs(mod
);
1423 mod_kobject_remove(mod
);
1425 unwind_remove_table(mod
->unwind_info
, 0);
1427 /* Arch-specific cleanup. */
1428 module_arch_cleanup(mod
);
1430 /* Module unload stuff */
1431 module_unload_free(mod
);
1433 /* This may be NULL, but that's OK */
1434 module_free(mod
, mod
->module_init
);
1437 percpu_modfree(mod
->percpu
);
1439 /* Free lock-classes: */
1440 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1442 /* Finally, free the core (containing the module structure) */
1443 module_free(mod
, mod
->module_core
);
1446 void *__symbol_get(const char *symbol
)
1448 struct module
*owner
;
1449 unsigned long value
;
1452 value
= find_symbol(symbol
, &owner
, NULL
, true, true);
1453 if (IS_ERR_VALUE(value
))
1455 else if (strong_try_module_get(owner
))
1459 return (void *)value
;
1461 EXPORT_SYMBOL_GPL(__symbol_get
);
1464 * Ensure that an exported symbol [global namespace] does not already exist
1465 * in the kernel or in some other module's exported symbol table.
1467 static int verify_export_symbols(struct module
*mod
)
1470 struct module
*owner
;
1471 const struct kernel_symbol
*s
;
1473 const struct kernel_symbol
*sym
;
1476 { mod
->syms
, mod
->num_syms
},
1477 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1478 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1479 #ifdef CONFIG_UNUSED_SYMBOLS
1480 { mod
->unused_syms
, mod
->num_unused_syms
},
1481 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1485 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1486 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1487 if (!IS_ERR_VALUE(find_symbol(s
->name
, &owner
,
1488 NULL
, true, false))) {
1490 "%s: exports duplicate symbol %s"
1492 mod
->name
, s
->name
, module_name(owner
));
1500 /* Change all symbols so that st_value encodes the pointer directly. */
1501 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1502 unsigned int symindex
,
1504 unsigned int versindex
,
1505 unsigned int pcpuindex
,
1508 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1509 unsigned long secbase
;
1510 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1513 for (i
= 1; i
< n
; i
++) {
1514 switch (sym
[i
].st_shndx
) {
1516 /* We compiled with -fno-common. These are not
1517 supposed to happen. */
1518 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1519 printk("%s: please compile with -fno-common\n",
1525 /* Don't need to do anything */
1526 DEBUGP("Absolute symbol: 0x%08lx\n",
1527 (long)sym
[i
].st_value
);
1532 = resolve_symbol(sechdrs
, versindex
,
1533 strtab
+ sym
[i
].st_name
, mod
);
1535 /* Ok if resolved. */
1536 if (!IS_ERR_VALUE(sym
[i
].st_value
))
1539 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1542 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1543 mod
->name
, strtab
+ sym
[i
].st_name
);
1548 /* Divert to percpu allocation if a percpu var. */
1549 if (sym
[i
].st_shndx
== pcpuindex
)
1550 secbase
= (unsigned long)mod
->percpu
;
1552 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1553 sym
[i
].st_value
+= secbase
;
1561 /* Update size with this section: return offset. */
1562 static long get_offset(unsigned int *size
, Elf_Shdr
*sechdr
)
1566 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1567 *size
= ret
+ sechdr
->sh_size
;
1571 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1572 might -- code, read-only data, read-write data, small data. Tally
1573 sizes, and place the offsets into sh_entsize fields: high bit means it
1575 static void layout_sections(struct module
*mod
,
1576 const Elf_Ehdr
*hdr
,
1578 const char *secstrings
)
1580 static unsigned long const masks
[][2] = {
1581 /* NOTE: all executable code must be the first section
1582 * in this array; otherwise modify the text_size
1583 * finder in the two loops below */
1584 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1585 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1586 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1587 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1591 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1592 sechdrs
[i
].sh_entsize
= ~0UL;
1594 DEBUGP("Core section allocation order:\n");
1595 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1596 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1597 Elf_Shdr
*s
= &sechdrs
[i
];
1599 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1600 || (s
->sh_flags
& masks
[m
][1])
1601 || s
->sh_entsize
!= ~0UL
1602 || strncmp(secstrings
+ s
->sh_name
,
1605 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1606 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1609 mod
->core_text_size
= mod
->core_size
;
1612 DEBUGP("Init section allocation order:\n");
1613 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1614 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1615 Elf_Shdr
*s
= &sechdrs
[i
];
1617 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1618 || (s
->sh_flags
& masks
[m
][1])
1619 || s
->sh_entsize
!= ~0UL
1620 || strncmp(secstrings
+ s
->sh_name
,
1623 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1624 | INIT_OFFSET_MASK
);
1625 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1628 mod
->init_text_size
= mod
->init_size
;
1632 static void set_license(struct module
*mod
, const char *license
)
1635 license
= "unspecified";
1637 if (!license_is_gpl_compatible(license
)) {
1638 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1639 printk(KERN_WARNING
"%s: module license '%s' taints "
1640 "kernel.\n", mod
->name
, license
);
1641 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1645 /* Parse tag=value strings from .modinfo section */
1646 static char *next_string(char *string
, unsigned long *secsize
)
1648 /* Skip non-zero chars */
1651 if ((*secsize
)-- <= 1)
1655 /* Skip any zero padding. */
1656 while (!string
[0]) {
1658 if ((*secsize
)-- <= 1)
1664 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1669 unsigned int taglen
= strlen(tag
);
1670 unsigned long size
= sechdrs
[info
].sh_size
;
1672 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1673 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1674 return p
+ taglen
+ 1;
1679 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1680 unsigned int infoindex
)
1682 struct module_attribute
*attr
;
1685 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1688 get_modinfo(sechdrs
,
1694 #ifdef CONFIG_KALLSYMS
1696 /* lookup symbol in given range of kernel_symbols */
1697 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1698 const struct kernel_symbol
*start
,
1699 const struct kernel_symbol
*stop
)
1701 const struct kernel_symbol
*ks
= start
;
1702 for (; ks
< stop
; ks
++)
1703 if (strcmp(ks
->name
, name
) == 0)
1708 static int is_exported(const char *name
, const struct module
*mod
)
1710 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1713 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1720 static char elf_type(const Elf_Sym
*sym
,
1722 const char *secstrings
,
1725 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1726 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1731 if (sym
->st_shndx
== SHN_UNDEF
)
1733 if (sym
->st_shndx
== SHN_ABS
)
1735 if (sym
->st_shndx
>= SHN_LORESERVE
)
1737 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1739 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1740 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1741 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1743 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1748 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1749 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1754 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1755 ".debug", strlen(".debug")) == 0)
1760 static void add_kallsyms(struct module
*mod
,
1762 unsigned int symindex
,
1763 unsigned int strindex
,
1764 const char *secstrings
)
1768 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1769 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1770 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1772 /* Set types up while we still have access to sections. */
1773 for (i
= 0; i
< mod
->num_symtab
; i
++)
1774 mod
->symtab
[i
].st_info
1775 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1778 static inline void add_kallsyms(struct module
*mod
,
1780 unsigned int symindex
,
1781 unsigned int strindex
,
1782 const char *secstrings
)
1785 #endif /* CONFIG_KALLSYMS */
1787 #ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
1788 static void dynamic_printk_setup(Elf_Shdr
*sechdrs
, unsigned int verboseindex
)
1790 struct mod_debug
*debug_info
;
1791 unsigned long pos
, end
;
1792 unsigned int num_verbose
;
1794 pos
= sechdrs
[verboseindex
].sh_addr
;
1795 num_verbose
= sechdrs
[verboseindex
].sh_size
/
1796 sizeof(struct mod_debug
);
1797 end
= pos
+ (num_verbose
* sizeof(struct mod_debug
));
1799 for (; pos
< end
; pos
+= sizeof(struct mod_debug
)) {
1800 debug_info
= (struct mod_debug
*)pos
;
1801 register_dynamic_debug_module(debug_info
->modname
,
1802 debug_info
->type
, debug_info
->logical_modname
,
1803 debug_info
->flag_names
, debug_info
->hash
,
1808 static inline void dynamic_printk_setup(Elf_Shdr
*sechdrs
,
1809 unsigned int verboseindex
)
1812 #endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
1814 static void *module_alloc_update_bounds(unsigned long size
)
1816 void *ret
= module_alloc(size
);
1819 /* Update module bounds. */
1820 if ((unsigned long)ret
< module_addr_min
)
1821 module_addr_min
= (unsigned long)ret
;
1822 if ((unsigned long)ret
+ size
> module_addr_max
)
1823 module_addr_max
= (unsigned long)ret
+ size
;
1828 /* Allocate and load the module: note that size of section 0 is always
1829 zero, and we rely on this for optional sections. */
1830 static noinline
struct module
*load_module(void __user
*umod
,
1832 const char __user
*uargs
)
1836 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1838 unsigned int symindex
= 0;
1839 unsigned int strindex
= 0;
1840 unsigned int setupindex
;
1841 unsigned int exindex
;
1842 unsigned int exportindex
;
1843 unsigned int modindex
;
1844 unsigned int obsparmindex
;
1845 unsigned int infoindex
;
1846 unsigned int gplindex
;
1847 unsigned int crcindex
;
1848 unsigned int gplcrcindex
;
1849 unsigned int versindex
;
1850 unsigned int pcpuindex
;
1851 unsigned int gplfutureindex
;
1852 unsigned int gplfuturecrcindex
;
1853 unsigned int unwindex
= 0;
1854 #ifdef CONFIG_UNUSED_SYMBOLS
1855 unsigned int unusedindex
;
1856 unsigned int unusedcrcindex
;
1857 unsigned int unusedgplindex
;
1858 unsigned int unusedgplcrcindex
;
1860 unsigned int markersindex
;
1861 unsigned int markersstringsindex
;
1862 unsigned int verboseindex
;
1865 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1866 struct exception_table_entry
*extable
;
1867 mm_segment_t old_fs
;
1869 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1871 if (len
< sizeof(*hdr
))
1872 return ERR_PTR(-ENOEXEC
);
1874 /* Suck in entire file: we'll want most of it. */
1875 /* vmalloc barfs on "unusual" numbers. Check here */
1876 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1877 return ERR_PTR(-ENOMEM
);
1878 if (copy_from_user(hdr
, umod
, len
) != 0) {
1883 /* Sanity checks against insmoding binaries or wrong arch,
1884 weird elf version */
1885 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
1886 || hdr
->e_type
!= ET_REL
1887 || !elf_check_arch(hdr
)
1888 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1893 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1896 /* Convenience variables */
1897 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1898 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1899 sechdrs
[0].sh_addr
= 0;
1901 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1902 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1903 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1906 /* Mark all sections sh_addr with their address in the
1908 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1910 /* Internal symbols and strings. */
1911 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1913 strindex
= sechdrs
[i
].sh_link
;
1914 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1916 #ifndef CONFIG_MODULE_UNLOAD
1917 /* Don't load .exit sections */
1918 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1919 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1923 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1924 ".gnu.linkonce.this_module");
1926 printk(KERN_WARNING
"No module found in object\n");
1930 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1932 if (symindex
== 0) {
1933 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1939 /* Optional sections */
1940 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1941 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1942 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1943 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1944 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1945 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1946 #ifdef CONFIG_UNUSED_SYMBOLS
1947 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1948 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1949 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1950 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1952 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1953 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1954 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1955 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1956 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1957 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1958 #ifdef ARCH_UNWIND_SECTION_NAME
1959 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1962 /* Don't keep modinfo and version sections. */
1963 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1964 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1965 #ifdef CONFIG_KALLSYMS
1966 /* Keep symbol and string tables for decoding later. */
1967 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1968 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1971 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1973 /* Check module struct version now, before we try to use module. */
1974 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1979 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1980 /* This is allowed: modprobe --force will invalidate it. */
1982 err
= try_to_force_load(mod
, "magic");
1985 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
1986 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1987 mod
->name
, modmagic
, vermagic
);
1992 /* Now copy in args */
1993 args
= strndup_user(uargs
, ~0UL >> 1);
1995 err
= PTR_ERR(args
);
1999 if (find_module(mod
->name
)) {
2004 mod
->state
= MODULE_STATE_COMING
;
2006 /* Allow arches to frob section contents and sizes. */
2007 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2012 /* We have a special allocation for this section. */
2013 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
2014 sechdrs
[pcpuindex
].sh_addralign
,
2020 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2021 mod
->percpu
= percpu
;
2024 /* Determine total sizes, and put offsets in sh_entsize. For now
2025 this is done generically; there doesn't appear to be any
2026 special cases for the architectures. */
2027 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2029 /* Do the allocs. */
2030 ptr
= module_alloc_update_bounds(mod
->core_size
);
2035 memset(ptr
, 0, mod
->core_size
);
2036 mod
->module_core
= ptr
;
2038 ptr
= module_alloc_update_bounds(mod
->init_size
);
2039 if (!ptr
&& mod
->init_size
) {
2043 memset(ptr
, 0, mod
->init_size
);
2044 mod
->module_init
= ptr
;
2046 /* Transfer each section which specifies SHF_ALLOC */
2047 DEBUGP("final section addresses:\n");
2048 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2051 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2054 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2055 dest
= mod
->module_init
2056 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2058 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2060 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2061 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2062 sechdrs
[i
].sh_size
);
2063 /* Update sh_addr to point to copy in image. */
2064 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2065 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2067 /* Module has been moved. */
2068 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2070 /* Now we've moved module, initialize linked lists, etc. */
2071 module_unload_init(mod
);
2073 /* add kobject, so we can reference it. */
2074 err
= mod_sysfs_init(mod
);
2078 /* Set up license info based on the info section */
2079 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2082 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2083 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2084 * using GPL-only symbols it needs.
2086 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2087 add_taint(TAINT_PROPRIETARY_MODULE
);
2089 /* driverloader was caught wrongly pretending to be under GPL */
2090 if (strcmp(mod
->name
, "driverloader") == 0)
2091 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2093 /* Set up MODINFO_ATTR fields */
2094 setup_modinfo(mod
, sechdrs
, infoindex
);
2096 /* Fix up syms, so that st_value is a pointer to location. */
2097 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2102 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
2103 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
2104 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
2106 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
2107 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
2108 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
2110 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
2111 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
2112 sizeof(*mod
->gpl_future_syms
);
2113 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
2114 if (gplfuturecrcindex
)
2115 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
2117 #ifdef CONFIG_UNUSED_SYMBOLS
2118 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
2119 sizeof(*mod
->unused_syms
);
2120 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
2121 sizeof(*mod
->unused_gpl_syms
);
2122 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
2124 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
2125 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
2126 if (unusedgplcrcindex
)
2127 mod
->unused_gpl_crcs
2128 = (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
2131 #ifdef CONFIG_MODVERSIONS
2132 if ((mod
->num_syms
&& !crcindex
)
2133 || (mod
->num_gpl_syms
&& !gplcrcindex
)
2134 || (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
)
2135 #ifdef CONFIG_UNUSED_SYMBOLS
2136 || (mod
->num_unused_syms
&& !unusedcrcindex
)
2137 || (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)
2140 printk(KERN_WARNING
"%s: No versions for exported symbols.\n", mod
->name
);
2141 err
= try_to_force_load(mod
, "nocrc");
2146 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
2147 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
2148 "__markers_strings");
2149 verboseindex
= find_sec(hdr
, sechdrs
, secstrings
, "__verbose");
2151 /* Now do relocations. */
2152 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2153 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2154 unsigned int info
= sechdrs
[i
].sh_info
;
2156 /* Not a valid relocation section? */
2157 if (info
>= hdr
->e_shnum
)
2160 /* Don't bother with non-allocated sections */
2161 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2164 if (sechdrs
[i
].sh_type
== SHT_REL
)
2165 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2166 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2167 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2172 #ifdef CONFIG_MARKERS
2173 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
2175 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
2178 /* Find duplicate symbols */
2179 err
= verify_export_symbols(mod
);
2184 /* Set up and sort exception table */
2185 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
2186 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
2187 sort_extable(extable
, extable
+ mod
->num_exentries
);
2189 /* Finally, copy percpu area over. */
2190 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2191 sechdrs
[pcpuindex
].sh_size
);
2193 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2195 #ifdef CONFIG_MARKERS
2197 marker_update_probe_range(mod
->markers
,
2198 mod
->markers
+ mod
->num_markers
);
2200 dynamic_printk_setup(sechdrs
, verboseindex
);
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
);
2271 module_unload_free(mod
);
2272 module_free(mod
, mod
->module_init
);
2274 module_free(mod
, mod
->module_core
);
2277 percpu_modfree(percpu
);
2282 return ERR_PTR(err
);
2285 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2290 /* This is where the real work happens */
2292 sys_init_module(void __user
*umod
,
2294 const char __user
*uargs
)
2299 /* Must have permission */
2300 if (!capable(CAP_SYS_MODULE
))
2303 /* Only one module load at a time, please */
2304 if (mutex_lock_interruptible(&module_mutex
) != 0)
2307 /* Do all the hard work */
2308 mod
= load_module(umod
, len
, uargs
);
2310 mutex_unlock(&module_mutex
);
2311 return PTR_ERR(mod
);
2314 /* Drop lock so they can recurse */
2315 mutex_unlock(&module_mutex
);
2317 blocking_notifier_call_chain(&module_notify_list
,
2318 MODULE_STATE_COMING
, mod
);
2320 /* Start the module */
2321 if (mod
->init
!= NULL
)
2322 ret
= do_one_initcall(mod
->init
);
2324 /* Init routine failed: abort. Try to protect us from
2325 buggy refcounters. */
2326 mod
->state
= MODULE_STATE_GOING
;
2327 synchronize_sched();
2329 blocking_notifier_call_chain(&module_notify_list
,
2330 MODULE_STATE_GOING
, mod
);
2331 mutex_lock(&module_mutex
);
2333 mutex_unlock(&module_mutex
);
2334 wake_up(&module_wq
);
2338 printk(KERN_WARNING
"%s: '%s'->init suspiciously returned %d, "
2339 "it should follow 0/-E convention\n"
2340 KERN_WARNING
"%s: loading module anyway...\n",
2341 __func__
, mod
->name
, ret
,
2346 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2347 mod
->state
= MODULE_STATE_LIVE
;
2348 wake_up(&module_wq
);
2350 mutex_lock(&module_mutex
);
2351 /* Drop initial reference. */
2353 unwind_remove_table(mod
->unwind_info
, 1);
2354 module_free(mod
, mod
->module_init
);
2355 mod
->module_init
= NULL
;
2357 mod
->init_text_size
= 0;
2358 mutex_unlock(&module_mutex
);
2363 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2365 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2368 #ifdef CONFIG_KALLSYMS
2370 * This ignores the intensely annoying "mapping symbols" found
2371 * in ARM ELF files: $a, $t and $d.
2373 static inline int is_arm_mapping_symbol(const char *str
)
2375 return str
[0] == '$' && strchr("atd", str
[1])
2376 && (str
[2] == '\0' || str
[2] == '.');
2379 static const char *get_ksymbol(struct module
*mod
,
2381 unsigned long *size
,
2382 unsigned long *offset
)
2384 unsigned int i
, best
= 0;
2385 unsigned long nextval
;
2387 /* At worse, next value is at end of module */
2388 if (within(addr
, mod
->module_init
, mod
->init_size
))
2389 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2391 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2393 /* Scan for closest preceeding symbol, and next symbol. (ELF
2394 starts real symbols at 1). */
2395 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2396 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2399 /* We ignore unnamed symbols: they're uninformative
2400 * and inserted at a whim. */
2401 if (mod
->symtab
[i
].st_value
<= addr
2402 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2403 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2404 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2406 if (mod
->symtab
[i
].st_value
> addr
2407 && mod
->symtab
[i
].st_value
< nextval
2408 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2409 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2410 nextval
= mod
->symtab
[i
].st_value
;
2417 *size
= nextval
- mod
->symtab
[best
].st_value
;
2419 *offset
= addr
- mod
->symtab
[best
].st_value
;
2420 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2423 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2424 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2425 const char *module_address_lookup(unsigned long addr
,
2426 unsigned long *size
,
2427 unsigned long *offset
,
2432 const char *ret
= NULL
;
2435 list_for_each_entry(mod
, &modules
, list
) {
2436 if (within(addr
, mod
->module_init
, mod
->init_size
)
2437 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2439 *modname
= mod
->name
;
2440 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2444 /* Make a copy in here where it's safe */
2446 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2453 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2458 list_for_each_entry(mod
, &modules
, list
) {
2459 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2460 within(addr
, mod
->module_core
, mod
->core_size
)) {
2463 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2466 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2476 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2477 unsigned long *offset
, char *modname
, char *name
)
2482 list_for_each_entry(mod
, &modules
, list
) {
2483 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2484 within(addr
, mod
->module_core
, mod
->core_size
)) {
2487 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2491 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2493 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2503 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2504 char *name
, char *module_name
, int *exported
)
2509 list_for_each_entry(mod
, &modules
, list
) {
2510 if (symnum
< mod
->num_symtab
) {
2511 *value
= mod
->symtab
[symnum
].st_value
;
2512 *type
= mod
->symtab
[symnum
].st_info
;
2513 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2515 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2516 *exported
= is_exported(name
, mod
);
2520 symnum
-= mod
->num_symtab
;
2526 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2530 for (i
= 0; i
< mod
->num_symtab
; i
++)
2531 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2532 mod
->symtab
[i
].st_info
!= 'U')
2533 return mod
->symtab
[i
].st_value
;
2537 /* Look for this name: can be of form module:name. */
2538 unsigned long module_kallsyms_lookup_name(const char *name
)
2542 unsigned long ret
= 0;
2544 /* Don't lock: we're in enough trouble already. */
2546 if ((colon
= strchr(name
, ':')) != NULL
) {
2548 if ((mod
= find_module(name
)) != NULL
)
2549 ret
= mod_find_symname(mod
, colon
+1);
2552 list_for_each_entry(mod
, &modules
, list
)
2553 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2559 #endif /* CONFIG_KALLSYMS */
2561 /* Called by the /proc file system to return a list of modules. */
2562 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2564 mutex_lock(&module_mutex
);
2565 return seq_list_start(&modules
, *pos
);
2568 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2570 return seq_list_next(p
, &modules
, pos
);
2573 static void m_stop(struct seq_file
*m
, void *p
)
2575 mutex_unlock(&module_mutex
);
2578 static char *module_flags(struct module
*mod
, char *buf
)
2583 mod
->state
== MODULE_STATE_GOING
||
2584 mod
->state
== MODULE_STATE_COMING
) {
2586 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2588 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2591 * TAINT_FORCED_RMMOD: could be added.
2592 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2596 /* Show a - for module-is-being-unloaded */
2597 if (mod
->state
== MODULE_STATE_GOING
)
2599 /* Show a + for module-is-being-loaded */
2600 if (mod
->state
== MODULE_STATE_COMING
)
2609 static int m_show(struct seq_file
*m
, void *p
)
2611 struct module
*mod
= list_entry(p
, struct module
, list
);
2614 seq_printf(m
, "%s %u",
2615 mod
->name
, mod
->init_size
+ mod
->core_size
);
2616 print_unload_info(m
, mod
);
2618 /* Informative for users. */
2619 seq_printf(m
, " %s",
2620 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2621 mod
->state
== MODULE_STATE_COMING
? "Loading":
2623 /* Used by oprofile and other similar tools. */
2624 seq_printf(m
, " 0x%p", mod
->module_core
);
2628 seq_printf(m
, " %s", module_flags(mod
, buf
));
2630 seq_printf(m
, "\n");
2634 /* Format: modulename size refcount deps address
2636 Where refcount is a number or -, and deps is a comma-separated list
2639 const struct seq_operations modules_op
= {
2646 /* Given an address, look for it in the module exception tables. */
2647 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2649 const struct exception_table_entry
*e
= NULL
;
2653 list_for_each_entry(mod
, &modules
, list
) {
2654 if (mod
->num_exentries
== 0)
2657 e
= search_extable(mod
->extable
,
2658 mod
->extable
+ mod
->num_exentries
- 1,
2665 /* Now, if we found one, we are running inside it now, hence
2666 we cannot unload the module, hence no refcnt needed. */
2671 * Is this a valid module address?
2673 int is_module_address(unsigned long addr
)
2679 list_for_each_entry(mod
, &modules
, list
) {
2680 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2692 /* Is this a valid kernel address? */
2693 struct module
*__module_text_address(unsigned long addr
)
2697 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2700 list_for_each_entry(mod
, &modules
, list
)
2701 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2702 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2707 struct module
*module_text_address(unsigned long addr
)
2712 mod
= __module_text_address(addr
);
2718 /* Don't grab lock, we're oopsing. */
2719 void print_modules(void)
2724 printk("Modules linked in:");
2725 list_for_each_entry(mod
, &modules
, list
)
2726 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2727 if (last_unloaded_module
[0])
2728 printk(" [last unloaded: %s]", last_unloaded_module
);
2732 #ifdef CONFIG_MODVERSIONS
2733 /* Generate the signature for struct module here, too, for modversions. */
2734 void struct_module(struct module
*mod
) { return; }
2735 EXPORT_SYMBOL(struct_module
);
2738 #ifdef CONFIG_MARKERS
2739 void module_update_markers(void)
2743 mutex_lock(&module_mutex
);
2744 list_for_each_entry(mod
, &modules
, list
)
2746 marker_update_probe_range(mod
->markers
,
2747 mod
->markers
+ mod
->num_markers
);
2748 mutex_unlock(&module_mutex
);