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 int register_module_notifier(struct notifier_block
* nb
)
75 return blocking_notifier_chain_register(&module_notify_list
, nb
);
77 EXPORT_SYMBOL(register_module_notifier
);
79 int unregister_module_notifier(struct notifier_block
* nb
)
81 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
83 EXPORT_SYMBOL(unregister_module_notifier
);
85 /* We require a truly strong try_module_get(): 0 means failure due to
86 ongoing or failed initialization etc. */
87 static inline int strong_try_module_get(struct module
*mod
)
89 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
91 if (try_module_get(mod
))
97 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
104 * A thread that wants to hold a reference to a module only while it
105 * is running can call this to safely exit. nfsd and lockd use this.
107 void __module_put_and_exit(struct module
*mod
, long code
)
112 EXPORT_SYMBOL(__module_put_and_exit
);
114 /* Find a module section: 0 means not found. */
115 static unsigned int find_sec(Elf_Ehdr
*hdr
,
117 const char *secstrings
,
122 for (i
= 1; i
< hdr
->e_shnum
; i
++)
123 /* Alloc bit cleared means "ignore it." */
124 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
125 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
130 /* Provided by the linker */
131 extern const struct kernel_symbol __start___ksymtab
[];
132 extern const struct kernel_symbol __stop___ksymtab
[];
133 extern const struct kernel_symbol __start___ksymtab_gpl
[];
134 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
135 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
136 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
137 extern const struct kernel_symbol __start___ksymtab_unused
[];
138 extern const struct kernel_symbol __stop___ksymtab_unused
[];
139 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
140 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
141 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
142 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
143 extern const unsigned long __start___kcrctab
[];
144 extern const unsigned long __start___kcrctab_gpl
[];
145 extern const unsigned long __start___kcrctab_gpl_future
[];
146 extern const unsigned long __start___kcrctab_unused
[];
147 extern const unsigned long __start___kcrctab_unused_gpl
[];
149 #ifndef CONFIG_MODVERSIONS
150 #define symversion(base, idx) NULL
152 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
155 /* lookup symbol in given range of kernel_symbols */
156 static const struct kernel_symbol
*lookup_symbol(const char *name
,
157 const struct kernel_symbol
*start
,
158 const struct kernel_symbol
*stop
)
160 const struct kernel_symbol
*ks
= start
;
161 for (; ks
< stop
; ks
++)
162 if (strcmp(ks
->name
, name
) == 0)
167 static void printk_unused_warning(const char *name
)
169 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
170 "however this module is using it.\n", name
);
171 printk(KERN_WARNING
"This symbol will go away in the future.\n");
172 printk(KERN_WARNING
"Please evalute if this is the right api to use, "
173 "and if it really is, submit a report the linux kernel "
174 "mailinglist together with submitting your code for "
178 /* Find a symbol, return value, crc and module which owns it */
179 static unsigned long __find_symbol(const char *name
,
180 struct module
**owner
,
181 const unsigned long **crc
,
185 const struct kernel_symbol
*ks
;
187 /* Core kernel first. */
189 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
191 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
195 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
196 __stop___ksymtab_gpl
);
198 *crc
= symversion(__start___kcrctab_gpl
,
199 (ks
- __start___ksymtab_gpl
));
203 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
204 __stop___ksymtab_gpl_future
);
207 printk(KERN_WARNING
"Symbol %s is being used "
208 "by a non-GPL module, which will not "
209 "be allowed in the future\n", name
);
210 printk(KERN_WARNING
"Please see the file "
211 "Documentation/feature-removal-schedule.txt "
212 "in the kernel source tree for more "
215 *crc
= symversion(__start___kcrctab_gpl_future
,
216 (ks
- __start___ksymtab_gpl_future
));
220 ks
= lookup_symbol(name
, __start___ksymtab_unused
,
221 __stop___ksymtab_unused
);
223 printk_unused_warning(name
);
224 *crc
= symversion(__start___kcrctab_unused
,
225 (ks
- __start___ksymtab_unused
));
230 ks
= lookup_symbol(name
, __start___ksymtab_unused_gpl
,
231 __stop___ksymtab_unused_gpl
);
233 printk_unused_warning(name
);
234 *crc
= symversion(__start___kcrctab_unused_gpl
,
235 (ks
- __start___ksymtab_unused_gpl
));
239 /* Now try modules. */
240 list_for_each_entry(mod
, &modules
, list
) {
242 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
244 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
249 ks
= lookup_symbol(name
, mod
->gpl_syms
,
250 mod
->gpl_syms
+ mod
->num_gpl_syms
);
252 *crc
= symversion(mod
->gpl_crcs
,
253 (ks
- mod
->gpl_syms
));
257 ks
= lookup_symbol(name
, mod
->unused_syms
, mod
->unused_syms
+ mod
->num_unused_syms
);
259 printk_unused_warning(name
);
260 *crc
= symversion(mod
->unused_crcs
, (ks
- mod
->unused_syms
));
265 ks
= lookup_symbol(name
, mod
->unused_gpl_syms
,
266 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
);
268 printk_unused_warning(name
);
269 *crc
= symversion(mod
->unused_gpl_crcs
,
270 (ks
- mod
->unused_gpl_syms
));
274 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
275 (mod
->gpl_future_syms
+
276 mod
->num_gpl_future_syms
));
279 printk(KERN_WARNING
"Symbol %s is being used "
280 "by a non-GPL module, which will not "
281 "be allowed in the future\n", name
);
282 printk(KERN_WARNING
"Please see the file "
283 "Documentation/feature-removal-schedule.txt "
284 "in the kernel source tree for more "
287 *crc
= symversion(mod
->gpl_future_crcs
,
288 (ks
- mod
->gpl_future_syms
));
292 DEBUGP("Failed to find symbol %s\n", name
);
296 /* Search for module by name: must hold module_mutex. */
297 static struct module
*find_module(const char *name
)
301 list_for_each_entry(mod
, &modules
, list
) {
302 if (strcmp(mod
->name
, name
) == 0)
309 /* Number of blocks used and allocated. */
310 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
311 /* Size of each block. -ve means used. */
312 static int *pcpu_size
;
314 static int split_block(unsigned int i
, unsigned short size
)
316 /* Reallocation required? */
317 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
320 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
325 pcpu_num_allocated
*= 2;
329 /* Insert a new subblock */
330 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
331 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
334 pcpu_size
[i
+1] -= size
;
339 static inline unsigned int block_size(int val
)
346 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
353 if (align
> PAGE_SIZE
) {
354 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
355 name
, align
, PAGE_SIZE
);
359 ptr
= __per_cpu_start
;
360 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
361 /* Extra for alignment requirement. */
362 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
363 BUG_ON(i
== 0 && extra
!= 0);
365 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
368 /* Transfer extra to previous block. */
369 if (pcpu_size
[i
-1] < 0)
370 pcpu_size
[i
-1] -= extra
;
372 pcpu_size
[i
-1] += extra
;
373 pcpu_size
[i
] -= extra
;
376 /* Split block if warranted */
377 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
378 if (!split_block(i
, size
))
382 pcpu_size
[i
] = -pcpu_size
[i
];
386 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
391 static void percpu_modfree(void *freeme
)
394 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
396 /* First entry is core kernel percpu data. */
397 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
399 pcpu_size
[i
] = -pcpu_size
[i
];
406 /* Merge with previous? */
407 if (pcpu_size
[i
-1] >= 0) {
408 pcpu_size
[i
-1] += pcpu_size
[i
];
410 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
411 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
414 /* Merge with next? */
415 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
416 pcpu_size
[i
] += pcpu_size
[i
+1];
418 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
419 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
423 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
425 const char *secstrings
)
427 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
430 static void percpu_modcopy(void *pcpudest
, const void *from
, unsigned long size
)
434 for_each_possible_cpu(cpu
)
435 memcpy(pcpudest
+ per_cpu_offset(cpu
), from
, size
);
438 static int percpu_modinit(void)
441 pcpu_num_allocated
= 2;
442 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
444 /* Static in-kernel percpu data (used). */
445 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
447 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
448 if (pcpu_size
[1] < 0) {
449 printk(KERN_ERR
"No per-cpu room for modules.\n");
455 __initcall(percpu_modinit
);
456 #else /* ... !CONFIG_SMP */
457 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
462 static inline void percpu_modfree(void *pcpuptr
)
466 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
468 const char *secstrings
)
472 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
475 /* pcpusec should be 0, and size of that section should be 0. */
478 #endif /* CONFIG_SMP */
480 #define MODINFO_ATTR(field) \
481 static void setup_modinfo_##field(struct module *mod, const char *s) \
483 mod->field = kstrdup(s, GFP_KERNEL); \
485 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
486 struct module *mod, char *buffer) \
488 return sprintf(buffer, "%s\n", mod->field); \
490 static int modinfo_##field##_exists(struct module *mod) \
492 return mod->field != NULL; \
494 static void free_modinfo_##field(struct module *mod) \
499 static struct module_attribute modinfo_##field = { \
500 .attr = { .name = __stringify(field), .mode = 0444 }, \
501 .show = show_modinfo_##field, \
502 .setup = setup_modinfo_##field, \
503 .test = modinfo_##field##_exists, \
504 .free = free_modinfo_##field, \
507 MODINFO_ATTR(version
);
508 MODINFO_ATTR(srcversion
);
510 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
512 #ifdef CONFIG_MODULE_UNLOAD
513 /* Init the unload section of the module. */
514 static void module_unload_init(struct module
*mod
)
518 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
519 for (i
= 0; i
< NR_CPUS
; i
++)
520 local_set(&mod
->ref
[i
].count
, 0);
521 /* Hold reference count during initialization. */
522 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
523 /* Backwards compatibility macros put refcount during init. */
524 mod
->waiter
= current
;
527 /* modules using other modules */
530 struct list_head list
;
531 struct module
*module_which_uses
;
534 /* Does a already use b? */
535 static int already_uses(struct module
*a
, struct module
*b
)
537 struct module_use
*use
;
539 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
540 if (use
->module_which_uses
== a
) {
541 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
545 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
549 /* Module a uses b */
550 static int use_module(struct module
*a
, struct module
*b
)
552 struct module_use
*use
;
555 if (b
== NULL
|| already_uses(a
, b
)) return 1;
557 /* If we're interrupted or time out, we fail. */
558 if (wait_event_interruptible_timeout(
559 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
561 printk("%s: gave up waiting for init of module %s.\n",
566 /* If strong_try_module_get() returned a different error, we fail. */
570 DEBUGP("Allocating new usage for %s.\n", a
->name
);
571 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
573 printk("%s: out of memory loading\n", a
->name
);
578 use
->module_which_uses
= a
;
579 list_add(&use
->list
, &b
->modules_which_use_me
);
580 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
584 /* Clear the unload stuff of the module. */
585 static void module_unload_free(struct module
*mod
)
589 list_for_each_entry(i
, &modules
, list
) {
590 struct module_use
*use
;
592 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
593 if (use
->module_which_uses
== mod
) {
594 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
596 list_del(&use
->list
);
598 sysfs_remove_link(i
->holders_dir
, mod
->name
);
599 /* There can be at most one match. */
606 #ifdef CONFIG_MODULE_FORCE_UNLOAD
607 static inline int try_force_unload(unsigned int flags
)
609 int ret
= (flags
& O_TRUNC
);
611 add_taint(TAINT_FORCED_RMMOD
);
615 static inline int try_force_unload(unsigned int flags
)
619 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
628 /* Whole machine is stopped with interrupts off when this runs. */
629 static int __try_stop_module(void *_sref
)
631 struct stopref
*sref
= _sref
;
633 /* If it's not unused, quit unless we are told to block. */
634 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
635 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
639 /* Mark it as dying. */
640 sref
->mod
->state
= MODULE_STATE_GOING
;
644 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
646 struct stopref sref
= { mod
, flags
, forced
};
648 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
651 unsigned int module_refcount(struct module
*mod
)
653 unsigned int i
, total
= 0;
655 for (i
= 0; i
< NR_CPUS
; i
++)
656 total
+= local_read(&mod
->ref
[i
].count
);
659 EXPORT_SYMBOL(module_refcount
);
661 /* This exists whether we can unload or not */
662 static void free_module(struct module
*mod
);
664 static void wait_for_zero_refcount(struct module
*mod
)
666 /* Since we might sleep for some time, release the mutex first */
667 mutex_unlock(&module_mutex
);
669 DEBUGP("Looking at refcount...\n");
670 set_current_state(TASK_UNINTERRUPTIBLE
);
671 if (module_refcount(mod
) == 0)
675 current
->state
= TASK_RUNNING
;
676 mutex_lock(&module_mutex
);
680 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
683 char name
[MODULE_NAME_LEN
];
686 if (!capable(CAP_SYS_MODULE
))
689 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
691 name
[MODULE_NAME_LEN
-1] = '\0';
693 if (mutex_lock_interruptible(&module_mutex
) != 0)
696 mod
= find_module(name
);
702 if (!list_empty(&mod
->modules_which_use_me
)) {
703 /* Other modules depend on us: get rid of them first. */
708 /* Doing init or already dying? */
709 if (mod
->state
!= MODULE_STATE_LIVE
) {
710 /* FIXME: if (force), slam module count and wake up
712 DEBUGP("%s already dying\n", mod
->name
);
717 /* If it has an init func, it must have an exit func to unload */
718 if (mod
->init
&& !mod
->exit
) {
719 forced
= try_force_unload(flags
);
721 /* This module can't be removed */
727 /* Set this up before setting mod->state */
728 mod
->waiter
= current
;
730 /* Stop the machine so refcounts can't move and disable module. */
731 ret
= try_stop_module(mod
, flags
, &forced
);
735 /* Never wait if forced. */
736 if (!forced
&& module_refcount(mod
) != 0)
737 wait_for_zero_refcount(mod
);
739 /* Final destruction now noone is using it. */
740 if (mod
->exit
!= NULL
) {
741 mutex_unlock(&module_mutex
);
743 mutex_lock(&module_mutex
);
745 /* Store the name of the last unloaded module for diagnostic purposes */
746 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
750 mutex_unlock(&module_mutex
);
754 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
756 struct module_use
*use
;
757 int printed_something
= 0;
759 seq_printf(m
, " %u ", module_refcount(mod
));
761 /* Always include a trailing , so userspace can differentiate
762 between this and the old multi-field proc format. */
763 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
764 printed_something
= 1;
765 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
768 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
769 printed_something
= 1;
770 seq_printf(m
, "[permanent],");
773 if (!printed_something
)
777 void __symbol_put(const char *symbol
)
779 struct module
*owner
;
780 const unsigned long *crc
;
783 if (IS_ERR_VALUE(__find_symbol(symbol
, &owner
, &crc
, 1)))
788 EXPORT_SYMBOL(__symbol_put
);
790 void symbol_put_addr(void *addr
)
792 struct module
*modaddr
;
794 if (core_kernel_text((unsigned long)addr
))
797 if (!(modaddr
= module_text_address((unsigned long)addr
)))
801 EXPORT_SYMBOL_GPL(symbol_put_addr
);
803 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
804 struct module
*mod
, char *buffer
)
806 return sprintf(buffer
, "%u\n", module_refcount(mod
));
809 static struct module_attribute refcnt
= {
810 .attr
= { .name
= "refcnt", .mode
= 0444 },
814 void module_put(struct module
*module
)
817 unsigned int cpu
= get_cpu();
818 local_dec(&module
->ref
[cpu
].count
);
819 /* Maybe they're waiting for us to drop reference? */
820 if (unlikely(!module_is_live(module
)))
821 wake_up_process(module
->waiter
);
825 EXPORT_SYMBOL(module_put
);
827 #else /* !CONFIG_MODULE_UNLOAD */
828 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
830 /* We don't know the usage count, or what modules are using. */
831 seq_printf(m
, " - -");
834 static inline void module_unload_free(struct module
*mod
)
838 static inline int use_module(struct module
*a
, struct module
*b
)
840 return strong_try_module_get(b
) == 0;
843 static inline void module_unload_init(struct module
*mod
)
846 #endif /* CONFIG_MODULE_UNLOAD */
848 static ssize_t
show_initstate(struct module_attribute
*mattr
,
849 struct module
*mod
, char *buffer
)
851 const char *state
= "unknown";
853 switch (mod
->state
) {
854 case MODULE_STATE_LIVE
:
857 case MODULE_STATE_COMING
:
860 case MODULE_STATE_GOING
:
864 return sprintf(buffer
, "%s\n", state
);
867 static struct module_attribute initstate
= {
868 .attr
= { .name
= "initstate", .mode
= 0444 },
869 .show
= show_initstate
,
872 static struct module_attribute
*modinfo_attrs
[] = {
876 #ifdef CONFIG_MODULE_UNLOAD
882 static const char vermagic
[] = VERMAGIC_STRING
;
884 #ifdef CONFIG_MODVERSIONS
885 static int check_version(Elf_Shdr
*sechdrs
,
886 unsigned int versindex
,
889 const unsigned long *crc
)
891 unsigned int i
, num_versions
;
892 struct modversion_info
*versions
;
894 /* Exporting module didn't supply crcs? OK, we're already tainted. */
898 versions
= (void *) sechdrs
[versindex
].sh_addr
;
899 num_versions
= sechdrs
[versindex
].sh_size
900 / sizeof(struct modversion_info
);
902 for (i
= 0; i
< num_versions
; i
++) {
903 if (strcmp(versions
[i
].name
, symname
) != 0)
906 if (versions
[i
].crc
== *crc
)
908 printk("%s: disagrees about version of symbol %s\n",
910 DEBUGP("Found checksum %lX vs module %lX\n",
911 *crc
, versions
[i
].crc
);
914 /* Not in module's version table. OK, but that taints the kernel. */
915 if (!(tainted
& TAINT_FORCED_MODULE
))
916 printk("%s: no version for \"%s\" found: kernel tainted.\n",
918 add_taint_module(mod
, TAINT_FORCED_MODULE
);
922 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
923 unsigned int versindex
,
926 const unsigned long *crc
;
927 struct module
*owner
;
929 if (IS_ERR_VALUE(__find_symbol("struct_module",
932 return check_version(sechdrs
, versindex
, "struct_module", mod
,
936 /* First part is kernel version, which we ignore. */
937 static inline int same_magic(const char *amagic
, const char *bmagic
)
939 amagic
+= strcspn(amagic
, " ");
940 bmagic
+= strcspn(bmagic
, " ");
941 return strcmp(amagic
, bmagic
) == 0;
944 static inline int check_version(Elf_Shdr
*sechdrs
,
945 unsigned int versindex
,
948 const unsigned long *crc
)
953 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
954 unsigned int versindex
,
960 static inline int same_magic(const char *amagic
, const char *bmagic
)
962 return strcmp(amagic
, bmagic
) == 0;
964 #endif /* CONFIG_MODVERSIONS */
966 /* Resolve a symbol for this module. I.e. if we find one, record usage.
967 Must be holding module_mutex. */
968 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
969 unsigned int versindex
,
973 struct module
*owner
;
975 const unsigned long *crc
;
977 ret
= __find_symbol(name
, &owner
, &crc
,
978 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
));
979 if (!IS_ERR_VALUE(ret
)) {
980 /* use_module can fail due to OOM,
981 or module initialization or unloading */
982 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
983 !use_module(mod
, owner
))
990 * /sys/module/foo/sections stuff
991 * J. Corbet <corbet@lwn.net>
993 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
994 struct module_sect_attr
996 struct module_attribute mattr
;
998 unsigned long address
;
1001 struct module_sect_attrs
1003 struct attribute_group grp
;
1004 unsigned int nsections
;
1005 struct module_sect_attr attrs
[0];
1008 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1009 struct module
*mod
, char *buf
)
1011 struct module_sect_attr
*sattr
=
1012 container_of(mattr
, struct module_sect_attr
, mattr
);
1013 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1016 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1018 unsigned int section
;
1020 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1021 kfree(sect_attrs
->attrs
[section
].name
);
1025 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1026 char *secstrings
, Elf_Shdr
*sechdrs
)
1028 unsigned int nloaded
= 0, i
, size
[2];
1029 struct module_sect_attrs
*sect_attrs
;
1030 struct module_sect_attr
*sattr
;
1031 struct attribute
**gattr
;
1033 /* Count loaded sections and allocate structures */
1034 for (i
= 0; i
< nsect
; i
++)
1035 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1037 size
[0] = ALIGN(sizeof(*sect_attrs
)
1038 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1039 sizeof(sect_attrs
->grp
.attrs
[0]));
1040 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1041 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1042 if (sect_attrs
== NULL
)
1045 /* Setup section attributes. */
1046 sect_attrs
->grp
.name
= "sections";
1047 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1049 sect_attrs
->nsections
= 0;
1050 sattr
= §_attrs
->attrs
[0];
1051 gattr
= §_attrs
->grp
.attrs
[0];
1052 for (i
= 0; i
< nsect
; i
++) {
1053 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1055 sattr
->address
= sechdrs
[i
].sh_addr
;
1056 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1058 if (sattr
->name
== NULL
)
1060 sect_attrs
->nsections
++;
1061 sattr
->mattr
.show
= module_sect_show
;
1062 sattr
->mattr
.store
= NULL
;
1063 sattr
->mattr
.attr
.name
= sattr
->name
;
1064 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1065 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1069 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1072 mod
->sect_attrs
= sect_attrs
;
1075 free_sect_attrs(sect_attrs
);
1078 static void remove_sect_attrs(struct module
*mod
)
1080 if (mod
->sect_attrs
) {
1081 sysfs_remove_group(&mod
->mkobj
.kobj
,
1082 &mod
->sect_attrs
->grp
);
1083 /* We are positive that no one is using any sect attrs
1084 * at this point. Deallocate immediately. */
1085 free_sect_attrs(mod
->sect_attrs
);
1086 mod
->sect_attrs
= NULL
;
1091 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1094 struct module_notes_attrs
{
1095 struct kobject
*dir
;
1097 struct bin_attribute attrs
[0];
1100 static ssize_t
module_notes_read(struct kobject
*kobj
,
1101 struct bin_attribute
*bin_attr
,
1102 char *buf
, loff_t pos
, size_t count
)
1105 * The caller checked the pos and count against our size.
1107 memcpy(buf
, bin_attr
->private + pos
, count
);
1111 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1114 if (notes_attrs
->dir
) {
1116 sysfs_remove_bin_file(notes_attrs
->dir
,
1117 ¬es_attrs
->attrs
[i
]);
1118 kobject_del(notes_attrs
->dir
);
1123 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1124 char *secstrings
, Elf_Shdr
*sechdrs
)
1126 unsigned int notes
, loaded
, i
;
1127 struct module_notes_attrs
*notes_attrs
;
1128 struct bin_attribute
*nattr
;
1130 /* Count notes sections and allocate structures. */
1132 for (i
= 0; i
< nsect
; i
++)
1133 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1134 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1140 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1141 + notes
* sizeof(notes_attrs
->attrs
[0]),
1143 if (notes_attrs
== NULL
)
1146 notes_attrs
->notes
= notes
;
1147 nattr
= ¬es_attrs
->attrs
[0];
1148 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1149 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1151 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1152 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1153 nattr
->attr
.mode
= S_IRUGO
;
1154 nattr
->size
= sechdrs
[i
].sh_size
;
1155 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1156 nattr
->read
= module_notes_read
;
1162 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1163 if (!notes_attrs
->dir
)
1166 for (i
= 0; i
< notes
; ++i
)
1167 if (sysfs_create_bin_file(notes_attrs
->dir
,
1168 ¬es_attrs
->attrs
[i
]))
1171 mod
->notes_attrs
= notes_attrs
;
1175 free_notes_attrs(notes_attrs
, i
);
1178 static void remove_notes_attrs(struct module
*mod
)
1180 if (mod
->notes_attrs
)
1181 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1186 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1187 char *sectstrings
, Elf_Shdr
*sechdrs
)
1191 static inline void remove_sect_attrs(struct module
*mod
)
1195 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1196 char *sectstrings
, Elf_Shdr
*sechdrs
)
1200 static inline void remove_notes_attrs(struct module
*mod
)
1206 int module_add_modinfo_attrs(struct module
*mod
)
1208 struct module_attribute
*attr
;
1209 struct module_attribute
*temp_attr
;
1213 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1214 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1216 if (!mod
->modinfo_attrs
)
1219 temp_attr
= mod
->modinfo_attrs
;
1220 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1222 (attr
->test
&& attr
->test(mod
))) {
1223 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1224 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1231 void module_remove_modinfo_attrs(struct module
*mod
)
1233 struct module_attribute
*attr
;
1236 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1237 /* pick a field to test for end of list */
1238 if (!attr
->attr
.name
)
1240 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1244 kfree(mod
->modinfo_attrs
);
1247 int mod_sysfs_init(struct module
*mod
)
1250 struct kobject
*kobj
;
1252 if (!module_sysfs_initialized
) {
1253 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1259 kobj
= kset_find_obj(module_kset
, mod
->name
);
1261 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1267 mod
->mkobj
.mod
= mod
;
1269 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1270 mod
->mkobj
.kobj
.kset
= module_kset
;
1271 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1274 kobject_put(&mod
->mkobj
.kobj
);
1276 /* delay uevent until full sysfs population */
1281 int mod_sysfs_setup(struct module
*mod
,
1282 struct kernel_param
*kparam
,
1283 unsigned int num_params
)
1287 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1288 if (!mod
->holders_dir
) {
1293 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1295 goto out_unreg_holders
;
1297 err
= module_add_modinfo_attrs(mod
);
1299 goto out_unreg_param
;
1301 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1305 module_param_sysfs_remove(mod
);
1307 kobject_put(mod
->holders_dir
);
1309 kobject_put(&mod
->mkobj
.kobj
);
1314 static void mod_kobject_remove(struct module
*mod
)
1316 module_remove_modinfo_attrs(mod
);
1317 module_param_sysfs_remove(mod
);
1318 kobject_put(mod
->mkobj
.drivers_dir
);
1319 kobject_put(mod
->holders_dir
);
1320 kobject_put(&mod
->mkobj
.kobj
);
1324 * link the module with the whole machine is stopped with interrupts off
1325 * - this defends against kallsyms not taking locks
1327 static int __link_module(void *_mod
)
1329 struct module
*mod
= _mod
;
1330 list_add(&mod
->list
, &modules
);
1335 * unlink the module with the whole machine is stopped with interrupts off
1336 * - this defends against kallsyms not taking locks
1338 static int __unlink_module(void *_mod
)
1340 struct module
*mod
= _mod
;
1341 list_del(&mod
->list
);
1345 /* Free a module, remove from lists, etc (must hold module_mutex). */
1346 static void free_module(struct module
*mod
)
1348 /* Delete from various lists */
1349 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1350 remove_notes_attrs(mod
);
1351 remove_sect_attrs(mod
);
1352 mod_kobject_remove(mod
);
1354 unwind_remove_table(mod
->unwind_info
, 0);
1356 /* Arch-specific cleanup. */
1357 module_arch_cleanup(mod
);
1359 /* Module unload stuff */
1360 module_unload_free(mod
);
1362 /* This may be NULL, but that's OK */
1363 module_free(mod
, mod
->module_init
);
1366 percpu_modfree(mod
->percpu
);
1368 /* Free lock-classes: */
1369 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1371 /* Finally, free the core (containing the module structure) */
1372 module_free(mod
, mod
->module_core
);
1375 void *__symbol_get(const char *symbol
)
1377 struct module
*owner
;
1378 unsigned long value
;
1379 const unsigned long *crc
;
1382 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1383 if (IS_ERR_VALUE(value
))
1385 else if (strong_try_module_get(owner
))
1389 return (void *)value
;
1391 EXPORT_SYMBOL_GPL(__symbol_get
);
1394 * Ensure that an exported symbol [global namespace] does not already exist
1395 * in the kernel or in some other module's exported symbol table.
1397 static int verify_export_symbols(struct module
*mod
)
1399 const char *name
= NULL
;
1400 unsigned long i
, ret
= 0;
1401 struct module
*owner
;
1402 const unsigned long *crc
;
1404 for (i
= 0; i
< mod
->num_syms
; i
++)
1405 if (!IS_ERR_VALUE(__find_symbol(mod
->syms
[i
].name
,
1406 &owner
, &crc
, 1))) {
1407 name
= mod
->syms
[i
].name
;
1412 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1413 if (!IS_ERR_VALUE(__find_symbol(mod
->gpl_syms
[i
].name
,
1414 &owner
, &crc
, 1))) {
1415 name
= mod
->gpl_syms
[i
].name
;
1422 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1423 mod
->name
, name
, module_name(owner
));
1428 /* Change all symbols so that st_value encodes the pointer directly. */
1429 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1430 unsigned int symindex
,
1432 unsigned int versindex
,
1433 unsigned int pcpuindex
,
1436 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1437 unsigned long secbase
;
1438 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1441 for (i
= 1; i
< n
; i
++) {
1442 switch (sym
[i
].st_shndx
) {
1444 /* We compiled with -fno-common. These are not
1445 supposed to happen. */
1446 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1447 printk("%s: please compile with -fno-common\n",
1453 /* Don't need to do anything */
1454 DEBUGP("Absolute symbol: 0x%08lx\n",
1455 (long)sym
[i
].st_value
);
1460 = resolve_symbol(sechdrs
, versindex
,
1461 strtab
+ sym
[i
].st_name
, mod
);
1463 /* Ok if resolved. */
1464 if (!IS_ERR_VALUE(sym
[i
].st_value
))
1467 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1470 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1471 mod
->name
, strtab
+ sym
[i
].st_name
);
1476 /* Divert to percpu allocation if a percpu var. */
1477 if (sym
[i
].st_shndx
== pcpuindex
)
1478 secbase
= (unsigned long)mod
->percpu
;
1480 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1481 sym
[i
].st_value
+= secbase
;
1489 /* Update size with this section: return offset. */
1490 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1494 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1495 *size
= ret
+ sechdr
->sh_size
;
1499 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1500 might -- code, read-only data, read-write data, small data. Tally
1501 sizes, and place the offsets into sh_entsize fields: high bit means it
1503 static void layout_sections(struct module
*mod
,
1504 const Elf_Ehdr
*hdr
,
1506 const char *secstrings
)
1508 static unsigned long const masks
[][2] = {
1509 /* NOTE: all executable code must be the first section
1510 * in this array; otherwise modify the text_size
1511 * finder in the two loops below */
1512 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1513 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1514 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1515 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1519 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1520 sechdrs
[i
].sh_entsize
= ~0UL;
1522 DEBUGP("Core section allocation order:\n");
1523 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1524 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1525 Elf_Shdr
*s
= &sechdrs
[i
];
1527 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1528 || (s
->sh_flags
& masks
[m
][1])
1529 || s
->sh_entsize
!= ~0UL
1530 || strncmp(secstrings
+ s
->sh_name
,
1533 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1534 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1537 mod
->core_text_size
= mod
->core_size
;
1540 DEBUGP("Init section allocation order:\n");
1541 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1542 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1543 Elf_Shdr
*s
= &sechdrs
[i
];
1545 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1546 || (s
->sh_flags
& masks
[m
][1])
1547 || s
->sh_entsize
!= ~0UL
1548 || strncmp(secstrings
+ s
->sh_name
,
1551 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1552 | INIT_OFFSET_MASK
);
1553 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1556 mod
->init_text_size
= mod
->init_size
;
1560 static void set_license(struct module
*mod
, const char *license
)
1563 license
= "unspecified";
1565 if (!license_is_gpl_compatible(license
)) {
1566 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1567 printk(KERN_WARNING
"%s: module license '%s' taints "
1568 "kernel.\n", mod
->name
, license
);
1569 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1573 /* Parse tag=value strings from .modinfo section */
1574 static char *next_string(char *string
, unsigned long *secsize
)
1576 /* Skip non-zero chars */
1579 if ((*secsize
)-- <= 1)
1583 /* Skip any zero padding. */
1584 while (!string
[0]) {
1586 if ((*secsize
)-- <= 1)
1592 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1597 unsigned int taglen
= strlen(tag
);
1598 unsigned long size
= sechdrs
[info
].sh_size
;
1600 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1601 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1602 return p
+ taglen
+ 1;
1607 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1608 unsigned int infoindex
)
1610 struct module_attribute
*attr
;
1613 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1616 get_modinfo(sechdrs
,
1622 #ifdef CONFIG_KALLSYMS
1623 static int is_exported(const char *name
, const struct module
*mod
)
1625 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1628 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1635 static char elf_type(const Elf_Sym
*sym
,
1637 const char *secstrings
,
1640 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1641 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1646 if (sym
->st_shndx
== SHN_UNDEF
)
1648 if (sym
->st_shndx
== SHN_ABS
)
1650 if (sym
->st_shndx
>= SHN_LORESERVE
)
1652 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1654 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1655 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1656 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1658 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1663 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1664 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1669 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1670 ".debug", strlen(".debug")) == 0)
1675 static void add_kallsyms(struct module
*mod
,
1677 unsigned int symindex
,
1678 unsigned int strindex
,
1679 const char *secstrings
)
1683 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1684 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1685 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1687 /* Set types up while we still have access to sections. */
1688 for (i
= 0; i
< mod
->num_symtab
; i
++)
1689 mod
->symtab
[i
].st_info
1690 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1693 static inline void add_kallsyms(struct module
*mod
,
1695 unsigned int symindex
,
1696 unsigned int strindex
,
1697 const char *secstrings
)
1700 #endif /* CONFIG_KALLSYMS */
1702 /* Allocate and load the module: note that size of section 0 is always
1703 zero, and we rely on this for optional sections. */
1704 static struct module
*load_module(void __user
*umod
,
1706 const char __user
*uargs
)
1710 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1712 unsigned int symindex
= 0;
1713 unsigned int strindex
= 0;
1714 unsigned int setupindex
;
1715 unsigned int exindex
;
1716 unsigned int exportindex
;
1717 unsigned int modindex
;
1718 unsigned int obsparmindex
;
1719 unsigned int infoindex
;
1720 unsigned int gplindex
;
1721 unsigned int crcindex
;
1722 unsigned int gplcrcindex
;
1723 unsigned int versindex
;
1724 unsigned int pcpuindex
;
1725 unsigned int gplfutureindex
;
1726 unsigned int gplfuturecrcindex
;
1727 unsigned int unwindex
= 0;
1728 unsigned int unusedindex
;
1729 unsigned int unusedcrcindex
;
1730 unsigned int unusedgplindex
;
1731 unsigned int unusedgplcrcindex
;
1732 unsigned int markersindex
;
1733 unsigned int markersstringsindex
;
1736 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1737 struct exception_table_entry
*extable
;
1738 mm_segment_t old_fs
;
1740 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1742 if (len
< sizeof(*hdr
))
1743 return ERR_PTR(-ENOEXEC
);
1745 /* Suck in entire file: we'll want most of it. */
1746 /* vmalloc barfs on "unusual" numbers. Check here */
1747 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1748 return ERR_PTR(-ENOMEM
);
1749 if (copy_from_user(hdr
, umod
, len
) != 0) {
1754 /* Sanity checks against insmoding binaries or wrong arch,
1755 weird elf version */
1756 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1757 || hdr
->e_type
!= ET_REL
1758 || !elf_check_arch(hdr
)
1759 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1764 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1767 /* Convenience variables */
1768 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1769 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1770 sechdrs
[0].sh_addr
= 0;
1772 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1773 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1774 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1777 /* Mark all sections sh_addr with their address in the
1779 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1781 /* Internal symbols and strings. */
1782 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1784 strindex
= sechdrs
[i
].sh_link
;
1785 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1787 #ifndef CONFIG_MODULE_UNLOAD
1788 /* Don't load .exit sections */
1789 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1790 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1794 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1795 ".gnu.linkonce.this_module");
1797 printk(KERN_WARNING
"No module found in object\n");
1801 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1803 if (symindex
== 0) {
1804 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1810 /* Optional sections */
1811 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1812 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1813 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1814 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1815 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1816 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1817 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1818 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1819 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1820 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1821 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1822 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1823 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1824 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1825 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1826 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1827 #ifdef ARCH_UNWIND_SECTION_NAME
1828 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1831 /* Don't keep modinfo and version sections. */
1832 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1833 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1834 #ifdef CONFIG_KALLSYMS
1835 /* Keep symbol and string tables for decoding later. */
1836 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1837 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1840 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1842 /* Check module struct version now, before we try to use module. */
1843 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1848 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1849 /* This is allowed: modprobe --force will invalidate it. */
1851 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1852 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1854 } else if (!same_magic(modmagic
, vermagic
)) {
1855 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1856 mod
->name
, modmagic
, vermagic
);
1861 /* Now copy in args */
1862 args
= strndup_user(uargs
, ~0UL >> 1);
1864 err
= PTR_ERR(args
);
1868 if (find_module(mod
->name
)) {
1873 mod
->state
= MODULE_STATE_COMING
;
1875 /* Allow arches to frob section contents and sizes. */
1876 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1881 /* We have a special allocation for this section. */
1882 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1883 sechdrs
[pcpuindex
].sh_addralign
,
1889 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1890 mod
->percpu
= percpu
;
1893 /* Determine total sizes, and put offsets in sh_entsize. For now
1894 this is done generically; there doesn't appear to be any
1895 special cases for the architectures. */
1896 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1898 /* Do the allocs. */
1899 ptr
= module_alloc(mod
->core_size
);
1904 memset(ptr
, 0, mod
->core_size
);
1905 mod
->module_core
= ptr
;
1907 ptr
= module_alloc(mod
->init_size
);
1908 if (!ptr
&& mod
->init_size
) {
1912 memset(ptr
, 0, mod
->init_size
);
1913 mod
->module_init
= ptr
;
1915 /* Transfer each section which specifies SHF_ALLOC */
1916 DEBUGP("final section addresses:\n");
1917 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1920 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1923 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1924 dest
= mod
->module_init
1925 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1927 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1929 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1930 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1931 sechdrs
[i
].sh_size
);
1932 /* Update sh_addr to point to copy in image. */
1933 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1934 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1936 /* Module has been moved. */
1937 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1939 /* Now we've moved module, initialize linked lists, etc. */
1940 module_unload_init(mod
);
1942 /* add kobject, so we can reference it. */
1943 err
= mod_sysfs_init(mod
);
1947 /* Set up license info based on the info section */
1948 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1951 * ndiswrapper is under GPL by itself, but loads proprietary modules.
1952 * Don't use add_taint_module(), as it would prevent ndiswrapper from
1953 * using GPL-only symbols it needs.
1955 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1956 add_taint(TAINT_PROPRIETARY_MODULE
);
1958 /* driverloader was caught wrongly pretending to be under GPL */
1959 if (strcmp(mod
->name
, "driverloader") == 0)
1960 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1962 /* Set up MODINFO_ATTR fields */
1963 setup_modinfo(mod
, sechdrs
, infoindex
);
1965 /* Fix up syms, so that st_value is a pointer to location. */
1966 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1971 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1972 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1973 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1975 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1976 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1977 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1979 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1980 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1981 sizeof(*mod
->gpl_future_syms
);
1982 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1983 sizeof(*mod
->unused_syms
);
1984 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1985 sizeof(*mod
->unused_gpl_syms
);
1986 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1987 if (gplfuturecrcindex
)
1988 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1990 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1992 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1993 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1994 if (unusedgplcrcindex
)
1995 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1997 #ifdef CONFIG_MODVERSIONS
1998 if ((mod
->num_syms
&& !crcindex
) ||
1999 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
2000 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
2001 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
2002 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
2003 printk(KERN_WARNING
"%s: No versions for exported symbols."
2004 " Tainting kernel.\n", mod
->name
);
2005 add_taint_module(mod
, TAINT_FORCED_MODULE
);
2008 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
2009 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
2010 "__markers_strings");
2012 /* Now do relocations. */
2013 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2014 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2015 unsigned int info
= sechdrs
[i
].sh_info
;
2017 /* Not a valid relocation section? */
2018 if (info
>= hdr
->e_shnum
)
2021 /* Don't bother with non-allocated sections */
2022 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2025 if (sechdrs
[i
].sh_type
== SHT_REL
)
2026 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2027 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2028 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2033 #ifdef CONFIG_MARKERS
2034 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
2036 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
2039 /* Find duplicate symbols */
2040 err
= verify_export_symbols(mod
);
2045 /* Set up and sort exception table */
2046 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
2047 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
2048 sort_extable(extable
, extable
+ mod
->num_exentries
);
2050 /* Finally, copy percpu area over. */
2051 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2052 sechdrs
[pcpuindex
].sh_size
);
2054 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2056 #ifdef CONFIG_MARKERS
2058 marker_update_probe_range(mod
->markers
,
2059 mod
->markers
+ mod
->num_markers
);
2061 err
= module_finalize(hdr
, sechdrs
, mod
);
2065 /* flush the icache in correct context */
2070 * Flush the instruction cache, since we've played with text.
2071 * Do it before processing of module parameters, so the module
2072 * can provide parameter accessor functions of its own.
2074 if (mod
->module_init
)
2075 flush_icache_range((unsigned long)mod
->module_init
,
2076 (unsigned long)mod
->module_init
2078 flush_icache_range((unsigned long)mod
->module_core
,
2079 (unsigned long)mod
->module_core
+ mod
->core_size
);
2085 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2088 /* Now sew it into the lists so we can get lockdep and oops
2089 * info during argument parsing. Noone should access us, since
2090 * strong_try_module_get() will fail. */
2091 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2093 /* Size of section 0 is 0, so this works well if no params */
2094 err
= parse_args(mod
->name
, mod
->args
,
2095 (struct kernel_param
*)
2096 sechdrs
[setupindex
].sh_addr
,
2097 sechdrs
[setupindex
].sh_size
2098 / sizeof(struct kernel_param
),
2103 err
= mod_sysfs_setup(mod
,
2104 (struct kernel_param
*)
2105 sechdrs
[setupindex
].sh_addr
,
2106 sechdrs
[setupindex
].sh_size
2107 / sizeof(struct kernel_param
));
2110 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2111 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2113 /* Size of section 0 is 0, so this works well if no unwind info. */
2114 mod
->unwind_info
= unwind_add_table(mod
,
2115 (void *)sechdrs
[unwindex
].sh_addr
,
2116 sechdrs
[unwindex
].sh_size
);
2118 /* Get rid of temporary copy */
2125 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
2126 module_arch_cleanup(mod
);
2128 kobject_del(&mod
->mkobj
.kobj
);
2129 kobject_put(&mod
->mkobj
.kobj
);
2131 module_unload_free(mod
);
2132 module_free(mod
, mod
->module_init
);
2134 module_free(mod
, mod
->module_core
);
2137 percpu_modfree(percpu
);
2142 return ERR_PTR(err
);
2145 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2150 /* This is where the real work happens */
2152 sys_init_module(void __user
*umod
,
2154 const char __user
*uargs
)
2159 /* Must have permission */
2160 if (!capable(CAP_SYS_MODULE
))
2163 /* Only one module load at a time, please */
2164 if (mutex_lock_interruptible(&module_mutex
) != 0)
2167 /* Do all the hard work */
2168 mod
= load_module(umod
, len
, uargs
);
2170 mutex_unlock(&module_mutex
);
2171 return PTR_ERR(mod
);
2174 /* Drop lock so they can recurse */
2175 mutex_unlock(&module_mutex
);
2177 blocking_notifier_call_chain(&module_notify_list
,
2178 MODULE_STATE_COMING
, mod
);
2180 /* Start the module */
2181 if (mod
->init
!= NULL
)
2184 /* Init routine failed: abort. Try to protect us from
2185 buggy refcounters. */
2186 mod
->state
= MODULE_STATE_GOING
;
2187 synchronize_sched();
2189 mutex_lock(&module_mutex
);
2191 mutex_unlock(&module_mutex
);
2192 wake_up(&module_wq
);
2196 printk(KERN_WARNING
"%s: '%s'->init suspiciously returned %d, "
2197 "it should follow 0/-E convention\n"
2198 KERN_WARNING
"%s: loading module anyway...\n",
2199 __func__
, mod
->name
, ret
,
2204 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2205 mod
->state
= MODULE_STATE_LIVE
;
2206 wake_up(&module_wq
);
2208 mutex_lock(&module_mutex
);
2209 /* Drop initial reference. */
2211 unwind_remove_table(mod
->unwind_info
, 1);
2212 module_free(mod
, mod
->module_init
);
2213 mod
->module_init
= NULL
;
2215 mod
->init_text_size
= 0;
2216 mutex_unlock(&module_mutex
);
2221 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2223 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2226 #ifdef CONFIG_KALLSYMS
2228 * This ignores the intensely annoying "mapping symbols" found
2229 * in ARM ELF files: $a, $t and $d.
2231 static inline int is_arm_mapping_symbol(const char *str
)
2233 return str
[0] == '$' && strchr("atd", str
[1])
2234 && (str
[2] == '\0' || str
[2] == '.');
2237 static const char *get_ksymbol(struct module
*mod
,
2239 unsigned long *size
,
2240 unsigned long *offset
)
2242 unsigned int i
, best
= 0;
2243 unsigned long nextval
;
2245 /* At worse, next value is at end of module */
2246 if (within(addr
, mod
->module_init
, mod
->init_size
))
2247 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2249 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2251 /* Scan for closest preceeding symbol, and next symbol. (ELF
2252 starts real symbols at 1). */
2253 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2254 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2257 /* We ignore unnamed symbols: they're uninformative
2258 * and inserted at a whim. */
2259 if (mod
->symtab
[i
].st_value
<= addr
2260 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2261 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2262 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2264 if (mod
->symtab
[i
].st_value
> addr
2265 && mod
->symtab
[i
].st_value
< nextval
2266 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2267 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2268 nextval
= mod
->symtab
[i
].st_value
;
2275 *size
= nextval
- mod
->symtab
[best
].st_value
;
2277 *offset
= addr
- mod
->symtab
[best
].st_value
;
2278 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2281 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2282 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2283 const char *module_address_lookup(unsigned long addr
,
2284 unsigned long *size
,
2285 unsigned long *offset
,
2290 const char *ret
= NULL
;
2293 list_for_each_entry(mod
, &modules
, list
) {
2294 if (within(addr
, mod
->module_init
, mod
->init_size
)
2295 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2297 *modname
= mod
->name
;
2298 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2302 /* Make a copy in here where it's safe */
2304 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2311 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2316 list_for_each_entry(mod
, &modules
, list
) {
2317 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2318 within(addr
, mod
->module_core
, mod
->core_size
)) {
2321 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2324 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2334 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2335 unsigned long *offset
, char *modname
, char *name
)
2340 list_for_each_entry(mod
, &modules
, list
) {
2341 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2342 within(addr
, mod
->module_core
, mod
->core_size
)) {
2345 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2349 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2351 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2361 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2362 char *name
, char *module_name
, int *exported
)
2367 list_for_each_entry(mod
, &modules
, list
) {
2368 if (symnum
< mod
->num_symtab
) {
2369 *value
= mod
->symtab
[symnum
].st_value
;
2370 *type
= mod
->symtab
[symnum
].st_info
;
2371 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2373 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2374 *exported
= is_exported(name
, mod
);
2378 symnum
-= mod
->num_symtab
;
2384 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2388 for (i
= 0; i
< mod
->num_symtab
; i
++)
2389 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2390 mod
->symtab
[i
].st_info
!= 'U')
2391 return mod
->symtab
[i
].st_value
;
2395 /* Look for this name: can be of form module:name. */
2396 unsigned long module_kallsyms_lookup_name(const char *name
)
2400 unsigned long ret
= 0;
2402 /* Don't lock: we're in enough trouble already. */
2404 if ((colon
= strchr(name
, ':')) != NULL
) {
2406 if ((mod
= find_module(name
)) != NULL
)
2407 ret
= mod_find_symname(mod
, colon
+1);
2410 list_for_each_entry(mod
, &modules
, list
)
2411 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2417 #endif /* CONFIG_KALLSYMS */
2419 /* Called by the /proc file system to return a list of modules. */
2420 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2422 mutex_lock(&module_mutex
);
2423 return seq_list_start(&modules
, *pos
);
2426 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2428 return seq_list_next(p
, &modules
, pos
);
2431 static void m_stop(struct seq_file
*m
, void *p
)
2433 mutex_unlock(&module_mutex
);
2436 static char *module_flags(struct module
*mod
, char *buf
)
2441 mod
->state
== MODULE_STATE_GOING
||
2442 mod
->state
== MODULE_STATE_COMING
) {
2444 if (mod
->taints
& TAINT_PROPRIETARY_MODULE
)
2446 if (mod
->taints
& TAINT_FORCED_MODULE
)
2449 * TAINT_FORCED_RMMOD: could be added.
2450 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2454 /* Show a - for module-is-being-unloaded */
2455 if (mod
->state
== MODULE_STATE_GOING
)
2457 /* Show a + for module-is-being-loaded */
2458 if (mod
->state
== MODULE_STATE_COMING
)
2467 static int m_show(struct seq_file
*m
, void *p
)
2469 struct module
*mod
= list_entry(p
, struct module
, list
);
2472 seq_printf(m
, "%s %lu",
2473 mod
->name
, mod
->init_size
+ mod
->core_size
);
2474 print_unload_info(m
, mod
);
2476 /* Informative for users. */
2477 seq_printf(m
, " %s",
2478 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2479 mod
->state
== MODULE_STATE_COMING
? "Loading":
2481 /* Used by oprofile and other similar tools. */
2482 seq_printf(m
, " 0x%p", mod
->module_core
);
2486 seq_printf(m
, " %s", module_flags(mod
, buf
));
2488 seq_printf(m
, "\n");
2492 /* Format: modulename size refcount deps address
2494 Where refcount is a number or -, and deps is a comma-separated list
2497 const struct seq_operations modules_op
= {
2504 /* Given an address, look for it in the module exception tables. */
2505 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2507 const struct exception_table_entry
*e
= NULL
;
2511 list_for_each_entry(mod
, &modules
, list
) {
2512 if (mod
->num_exentries
== 0)
2515 e
= search_extable(mod
->extable
,
2516 mod
->extable
+ mod
->num_exentries
- 1,
2523 /* Now, if we found one, we are running inside it now, hence
2524 we cannot unload the module, hence no refcnt needed. */
2529 * Is this a valid module address?
2531 int is_module_address(unsigned long addr
)
2537 list_for_each_entry(mod
, &modules
, list
) {
2538 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2550 /* Is this a valid kernel address? */
2551 struct module
*__module_text_address(unsigned long addr
)
2555 list_for_each_entry(mod
, &modules
, list
)
2556 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2557 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2562 struct module
*module_text_address(unsigned long addr
)
2567 mod
= __module_text_address(addr
);
2573 /* Don't grab lock, we're oopsing. */
2574 void print_modules(void)
2579 printk("Modules linked in:");
2580 list_for_each_entry(mod
, &modules
, list
)
2581 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2582 if (last_unloaded_module
[0])
2583 printk(" [last unloaded: %s]", last_unloaded_module
);
2587 #ifdef CONFIG_MODVERSIONS
2588 /* Generate the signature for struct module here, too, for modversions. */
2589 void struct_module(struct module
*mod
) { return; }
2590 EXPORT_SYMBOL(struct_module
);
2593 #ifdef CONFIG_MARKERS
2594 void module_update_markers(void)
2598 mutex_lock(&module_mutex
);
2599 list_for_each_entry(mod
, &modules
, list
)
2601 marker_update_probe_range(mod
->markers
,
2602 mod
->markers
+ mod
->num_markers
);
2603 mutex_unlock(&module_mutex
);