2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/init.h>
22 #include <linux/kallsyms.h>
23 #include <linux/sysfs.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/elf.h>
28 #include <linux/seq_file.h>
29 #include <linux/syscalls.h>
30 #include <linux/fcntl.h>
31 #include <linux/rcupdate.h>
32 #include <linux/capability.h>
33 #include <linux/cpu.h>
34 #include <linux/moduleparam.h>
35 #include <linux/errno.h>
36 #include <linux/err.h>
37 #include <linux/vermagic.h>
38 #include <linux/notifier.h>
39 #include <linux/sched.h>
40 #include <linux/stop_machine.h>
41 #include <linux/device.h>
42 #include <linux/string.h>
43 #include <linux/mutex.h>
44 #include <linux/unwind.h>
45 #include <asm/uaccess.h>
46 #include <asm/semaphore.h>
47 #include <asm/cacheflush.h>
48 #include <linux/license.h>
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 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
70 int register_module_notifier(struct notifier_block
* nb
)
72 return blocking_notifier_chain_register(&module_notify_list
, nb
);
74 EXPORT_SYMBOL(register_module_notifier
);
76 int unregister_module_notifier(struct notifier_block
* nb
)
78 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
80 EXPORT_SYMBOL(unregister_module_notifier
);
82 /* We require a truly strong try_module_get(): 0 means failure due to
83 ongoing or failed initialization etc. */
84 static inline int strong_try_module_get(struct module
*mod
)
86 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
88 return try_module_get(mod
);
91 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
98 * A thread that wants to hold a reference to a module only while it
99 * is running can call this to safely exit. nfsd and lockd use this.
101 void __module_put_and_exit(struct module
*mod
, long code
)
106 EXPORT_SYMBOL(__module_put_and_exit
);
108 /* Find a module section: 0 means not found. */
109 static unsigned int find_sec(Elf_Ehdr
*hdr
,
111 const char *secstrings
,
116 for (i
= 1; i
< hdr
->e_shnum
; i
++)
117 /* Alloc bit cleared means "ignore it." */
118 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
119 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
124 /* Provided by the linker */
125 extern const struct kernel_symbol __start___ksymtab
[];
126 extern const struct kernel_symbol __stop___ksymtab
[];
127 extern const struct kernel_symbol __start___ksymtab_gpl
[];
128 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
129 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
130 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
131 extern const struct kernel_symbol __start___ksymtab_unused
[];
132 extern const struct kernel_symbol __stop___ksymtab_unused
[];
133 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
134 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
135 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
136 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
137 extern const unsigned long __start___kcrctab
[];
138 extern const unsigned long __start___kcrctab_gpl
[];
139 extern const unsigned long __start___kcrctab_gpl_future
[];
140 extern const unsigned long __start___kcrctab_unused
[];
141 extern const unsigned long __start___kcrctab_unused_gpl
[];
143 #ifndef CONFIG_MODVERSIONS
144 #define symversion(base, idx) NULL
146 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
149 /* lookup symbol in given range of kernel_symbols */
150 static const struct kernel_symbol
*lookup_symbol(const char *name
,
151 const struct kernel_symbol
*start
,
152 const struct kernel_symbol
*stop
)
154 const struct kernel_symbol
*ks
= start
;
155 for (; ks
< stop
; ks
++)
156 if (strcmp(ks
->name
, name
) == 0)
161 static void printk_unused_warning(const char *name
)
163 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
164 "however this module is using it.\n", name
);
165 printk(KERN_WARNING
"This symbol will go away in the future.\n");
166 printk(KERN_WARNING
"Please evalute if this is the right api to use, "
167 "and if it really is, submit a report the linux kernel "
168 "mailinglist together with submitting your code for "
172 /* Find a symbol, return value, crc and module which owns it */
173 static unsigned long __find_symbol(const char *name
,
174 struct module
**owner
,
175 const unsigned long **crc
,
179 const struct kernel_symbol
*ks
;
181 /* Core kernel first. */
183 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
185 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
189 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
190 __stop___ksymtab_gpl
);
192 *crc
= symversion(__start___kcrctab_gpl
,
193 (ks
- __start___ksymtab_gpl
));
197 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
198 __stop___ksymtab_gpl_future
);
201 printk(KERN_WARNING
"Symbol %s is being used "
202 "by a non-GPL module, which will not "
203 "be allowed in the future\n", name
);
204 printk(KERN_WARNING
"Please see the file "
205 "Documentation/feature-removal-schedule.txt "
206 "in the kernel source tree for more "
209 *crc
= symversion(__start___kcrctab_gpl_future
,
210 (ks
- __start___ksymtab_gpl_future
));
214 ks
= lookup_symbol(name
, __start___ksymtab_unused
,
215 __stop___ksymtab_unused
);
217 printk_unused_warning(name
);
218 *crc
= symversion(__start___kcrctab_unused
,
219 (ks
- __start___ksymtab_unused
));
224 ks
= lookup_symbol(name
, __start___ksymtab_unused_gpl
,
225 __stop___ksymtab_unused_gpl
);
227 printk_unused_warning(name
);
228 *crc
= symversion(__start___kcrctab_unused_gpl
,
229 (ks
- __start___ksymtab_unused_gpl
));
233 /* Now try modules. */
234 list_for_each_entry(mod
, &modules
, list
) {
236 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
238 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
243 ks
= lookup_symbol(name
, mod
->gpl_syms
,
244 mod
->gpl_syms
+ mod
->num_gpl_syms
);
246 *crc
= symversion(mod
->gpl_crcs
,
247 (ks
- mod
->gpl_syms
));
251 ks
= lookup_symbol(name
, mod
->unused_syms
, mod
->unused_syms
+ mod
->num_unused_syms
);
253 printk_unused_warning(name
);
254 *crc
= symversion(mod
->unused_crcs
, (ks
- mod
->unused_syms
));
259 ks
= lookup_symbol(name
, mod
->unused_gpl_syms
,
260 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
);
262 printk_unused_warning(name
);
263 *crc
= symversion(mod
->unused_gpl_crcs
,
264 (ks
- mod
->unused_gpl_syms
));
268 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
269 (mod
->gpl_future_syms
+
270 mod
->num_gpl_future_syms
));
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", name
);
276 printk(KERN_WARNING
"Please see the file "
277 "Documentation/feature-removal-schedule.txt "
278 "in the kernel source tree for more "
281 *crc
= symversion(mod
->gpl_future_crcs
,
282 (ks
- mod
->gpl_future_syms
));
286 DEBUGP("Failed to find symbol %s\n", name
);
290 /* Search for module by name: must hold module_mutex. */
291 static struct module
*find_module(const char *name
)
295 list_for_each_entry(mod
, &modules
, list
) {
296 if (strcmp(mod
->name
, name
) == 0)
303 /* Number of blocks used and allocated. */
304 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
305 /* Size of each block. -ve means used. */
306 static int *pcpu_size
;
308 static int split_block(unsigned int i
, unsigned short size
)
310 /* Reallocation required? */
311 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
314 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
319 pcpu_num_allocated
*= 2;
323 /* Insert a new subblock */
324 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
325 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
328 pcpu_size
[i
+1] -= size
;
333 static inline unsigned int block_size(int val
)
340 /* Created by linker magic */
341 extern char __per_cpu_start
[], __per_cpu_end
[];
343 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
350 if (align
> PAGE_SIZE
) {
351 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
352 name
, align
, PAGE_SIZE
);
356 ptr
= __per_cpu_start
;
357 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
358 /* Extra for alignment requirement. */
359 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
360 BUG_ON(i
== 0 && extra
!= 0);
362 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
365 /* Transfer extra to previous block. */
366 if (pcpu_size
[i
-1] < 0)
367 pcpu_size
[i
-1] -= extra
;
369 pcpu_size
[i
-1] += extra
;
370 pcpu_size
[i
] -= extra
;
373 /* Split block if warranted */
374 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
375 if (!split_block(i
, size
))
379 pcpu_size
[i
] = -pcpu_size
[i
];
383 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
388 static void percpu_modfree(void *freeme
)
391 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
393 /* First entry is core kernel percpu data. */
394 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
396 pcpu_size
[i
] = -pcpu_size
[i
];
403 /* Merge with previous? */
404 if (pcpu_size
[i
-1] >= 0) {
405 pcpu_size
[i
-1] += pcpu_size
[i
];
407 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
408 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
411 /* Merge with next? */
412 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
413 pcpu_size
[i
] += pcpu_size
[i
+1];
415 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
416 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
420 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
422 const char *secstrings
)
424 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
427 static int percpu_modinit(void)
430 pcpu_num_allocated
= 2;
431 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
433 /* Static in-kernel percpu data (used). */
434 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
436 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
437 if (pcpu_size
[1] < 0) {
438 printk(KERN_ERR
"No per-cpu room for modules.\n");
444 __initcall(percpu_modinit
);
445 #else /* ... !CONFIG_SMP */
446 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
451 static inline void percpu_modfree(void *pcpuptr
)
455 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
457 const char *secstrings
)
461 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
464 /* pcpusec should be 0, and size of that section should be 0. */
467 #endif /* CONFIG_SMP */
469 #define MODINFO_ATTR(field) \
470 static void setup_modinfo_##field(struct module *mod, const char *s) \
472 mod->field = kstrdup(s, GFP_KERNEL); \
474 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
475 struct module *mod, char *buffer) \
477 return sprintf(buffer, "%s\n", mod->field); \
479 static int modinfo_##field##_exists(struct module *mod) \
481 return mod->field != NULL; \
483 static void free_modinfo_##field(struct module *mod) \
488 static struct module_attribute modinfo_##field = { \
489 .attr = { .name = __stringify(field), .mode = 0444 }, \
490 .show = show_modinfo_##field, \
491 .setup = setup_modinfo_##field, \
492 .test = modinfo_##field##_exists, \
493 .free = free_modinfo_##field, \
496 MODINFO_ATTR(version
);
497 MODINFO_ATTR(srcversion
);
499 #ifdef CONFIG_MODULE_UNLOAD
500 /* Init the unload section of the module. */
501 static void module_unload_init(struct module
*mod
)
505 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
506 for (i
= 0; i
< NR_CPUS
; i
++)
507 local_set(&mod
->ref
[i
].count
, 0);
508 /* Hold reference count during initialization. */
509 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
510 /* Backwards compatibility macros put refcount during init. */
511 mod
->waiter
= current
;
514 /* modules using other modules */
517 struct list_head list
;
518 struct module
*module_which_uses
;
521 /* Does a already use b? */
522 static int already_uses(struct module
*a
, struct module
*b
)
524 struct module_use
*use
;
526 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
527 if (use
->module_which_uses
== a
) {
528 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
532 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
536 /* Module a uses b */
537 static int use_module(struct module
*a
, struct module
*b
)
539 struct module_use
*use
;
542 if (b
== NULL
|| already_uses(a
, b
)) return 1;
544 if (!strong_try_module_get(b
))
547 DEBUGP("Allocating new usage for %s.\n", a
->name
);
548 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
550 printk("%s: out of memory loading\n", a
->name
);
555 use
->module_which_uses
= a
;
556 list_add(&use
->list
, &b
->modules_which_use_me
);
557 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
561 /* Clear the unload stuff of the module. */
562 static void module_unload_free(struct module
*mod
)
566 list_for_each_entry(i
, &modules
, list
) {
567 struct module_use
*use
;
569 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
570 if (use
->module_which_uses
== mod
) {
571 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
573 list_del(&use
->list
);
575 sysfs_remove_link(i
->holders_dir
, mod
->name
);
576 /* There can be at most one match. */
583 #ifdef CONFIG_MODULE_FORCE_UNLOAD
584 static inline int try_force_unload(unsigned int flags
)
586 int ret
= (flags
& O_TRUNC
);
588 add_taint(TAINT_FORCED_RMMOD
);
592 static inline int try_force_unload(unsigned int flags
)
596 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
605 /* Whole machine is stopped with interrupts off when this runs. */
606 static int __try_stop_module(void *_sref
)
608 struct stopref
*sref
= _sref
;
610 /* If it's not unused, quit unless we are told to block. */
611 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
612 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
616 /* Mark it as dying. */
617 sref
->mod
->state
= MODULE_STATE_GOING
;
621 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
623 struct stopref sref
= { mod
, flags
, forced
};
625 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
628 unsigned int module_refcount(struct module
*mod
)
630 unsigned int i
, total
= 0;
632 for (i
= 0; i
< NR_CPUS
; i
++)
633 total
+= local_read(&mod
->ref
[i
].count
);
636 EXPORT_SYMBOL(module_refcount
);
638 /* This exists whether we can unload or not */
639 static void free_module(struct module
*mod
);
641 static void wait_for_zero_refcount(struct module
*mod
)
643 /* Since we might sleep for some time, drop the semaphore first */
644 mutex_unlock(&module_mutex
);
646 DEBUGP("Looking at refcount...\n");
647 set_current_state(TASK_UNINTERRUPTIBLE
);
648 if (module_refcount(mod
) == 0)
652 current
->state
= TASK_RUNNING
;
653 mutex_lock(&module_mutex
);
657 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
660 char name
[MODULE_NAME_LEN
];
663 if (!capable(CAP_SYS_MODULE
))
666 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
668 name
[MODULE_NAME_LEN
-1] = '\0';
670 if (mutex_lock_interruptible(&module_mutex
) != 0)
673 mod
= find_module(name
);
679 if (!list_empty(&mod
->modules_which_use_me
)) {
680 /* Other modules depend on us: get rid of them first. */
685 /* Doing init or already dying? */
686 if (mod
->state
!= MODULE_STATE_LIVE
) {
687 /* FIXME: if (force), slam module count and wake up
689 DEBUGP("%s already dying\n", mod
->name
);
694 /* If it has an init func, it must have an exit func to unload */
695 if (mod
->init
&& !mod
->exit
) {
696 forced
= try_force_unload(flags
);
698 /* This module can't be removed */
704 /* Set this up before setting mod->state */
705 mod
->waiter
= current
;
707 /* Stop the machine so refcounts can't move and disable module. */
708 ret
= try_stop_module(mod
, flags
, &forced
);
712 /* Never wait if forced. */
713 if (!forced
&& module_refcount(mod
) != 0)
714 wait_for_zero_refcount(mod
);
716 /* Final destruction now noone is using it. */
717 if (mod
->exit
!= NULL
) {
718 mutex_unlock(&module_mutex
);
720 mutex_lock(&module_mutex
);
725 mutex_unlock(&module_mutex
);
729 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
731 struct module_use
*use
;
732 int printed_something
= 0;
734 seq_printf(m
, " %u ", module_refcount(mod
));
736 /* Always include a trailing , so userspace can differentiate
737 between this and the old multi-field proc format. */
738 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
739 printed_something
= 1;
740 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
743 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
744 printed_something
= 1;
745 seq_printf(m
, "[permanent],");
748 if (!printed_something
)
752 void __symbol_put(const char *symbol
)
754 struct module
*owner
;
755 const unsigned long *crc
;
758 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
763 EXPORT_SYMBOL(__symbol_put
);
765 void symbol_put_addr(void *addr
)
767 struct module
*modaddr
;
769 if (core_kernel_text((unsigned long)addr
))
772 if (!(modaddr
= module_text_address((unsigned long)addr
)))
776 EXPORT_SYMBOL_GPL(symbol_put_addr
);
778 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
779 struct module
*mod
, char *buffer
)
781 return sprintf(buffer
, "%u\n", module_refcount(mod
));
784 static struct module_attribute refcnt
= {
785 .attr
= { .name
= "refcnt", .mode
= 0444 },
789 void module_put(struct module
*module
)
792 unsigned int cpu
= get_cpu();
793 local_dec(&module
->ref
[cpu
].count
);
794 /* Maybe they're waiting for us to drop reference? */
795 if (unlikely(!module_is_live(module
)))
796 wake_up_process(module
->waiter
);
800 EXPORT_SYMBOL(module_put
);
802 #else /* !CONFIG_MODULE_UNLOAD */
803 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
805 /* We don't know the usage count, or what modules are using. */
806 seq_printf(m
, " - -");
809 static inline void module_unload_free(struct module
*mod
)
813 static inline int use_module(struct module
*a
, struct module
*b
)
815 return strong_try_module_get(b
);
818 static inline void module_unload_init(struct module
*mod
)
821 #endif /* CONFIG_MODULE_UNLOAD */
823 static ssize_t
show_initstate(struct module_attribute
*mattr
,
824 struct module
*mod
, char *buffer
)
826 const char *state
= "unknown";
828 switch (mod
->state
) {
829 case MODULE_STATE_LIVE
:
832 case MODULE_STATE_COMING
:
835 case MODULE_STATE_GOING
:
839 return sprintf(buffer
, "%s\n", state
);
842 static struct module_attribute initstate
= {
843 .attr
= { .name
= "initstate", .mode
= 0444 },
844 .show
= show_initstate
,
847 static struct module_attribute
*modinfo_attrs
[] = {
851 #ifdef CONFIG_MODULE_UNLOAD
857 static const char vermagic
[] = VERMAGIC_STRING
;
859 #ifdef CONFIG_MODVERSIONS
860 static int check_version(Elf_Shdr
*sechdrs
,
861 unsigned int versindex
,
864 const unsigned long *crc
)
866 unsigned int i
, num_versions
;
867 struct modversion_info
*versions
;
869 /* Exporting module didn't supply crcs? OK, we're already tainted. */
873 versions
= (void *) sechdrs
[versindex
].sh_addr
;
874 num_versions
= sechdrs
[versindex
].sh_size
875 / sizeof(struct modversion_info
);
877 for (i
= 0; i
< num_versions
; i
++) {
878 if (strcmp(versions
[i
].name
, symname
) != 0)
881 if (versions
[i
].crc
== *crc
)
883 printk("%s: disagrees about version of symbol %s\n",
885 DEBUGP("Found checksum %lX vs module %lX\n",
886 *crc
, versions
[i
].crc
);
889 /* Not in module's version table. OK, but that taints the kernel. */
890 if (!(tainted
& TAINT_FORCED_MODULE
))
891 printk("%s: no version for \"%s\" found: kernel tainted.\n",
893 add_taint_module(mod
, TAINT_FORCED_MODULE
);
897 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
898 unsigned int versindex
,
901 const unsigned long *crc
;
902 struct module
*owner
;
904 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
906 return check_version(sechdrs
, versindex
, "struct_module", mod
,
910 /* First part is kernel version, which we ignore. */
911 static inline int same_magic(const char *amagic
, const char *bmagic
)
913 amagic
+= strcspn(amagic
, " ");
914 bmagic
+= strcspn(bmagic
, " ");
915 return strcmp(amagic
, bmagic
) == 0;
918 static inline int check_version(Elf_Shdr
*sechdrs
,
919 unsigned int versindex
,
922 const unsigned long *crc
)
927 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
928 unsigned int versindex
,
934 static inline int same_magic(const char *amagic
, const char *bmagic
)
936 return strcmp(amagic
, bmagic
) == 0;
938 #endif /* CONFIG_MODVERSIONS */
940 /* Resolve a symbol for this module. I.e. if we find one, record usage.
941 Must be holding module_mutex. */
942 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
943 unsigned int versindex
,
947 struct module
*owner
;
949 const unsigned long *crc
;
951 ret
= __find_symbol(name
, &owner
, &crc
,
952 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
));
954 /* use_module can fail due to OOM,
955 or module initialization or unloading */
956 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
957 !use_module(mod
, owner
))
965 * /sys/module/foo/sections stuff
966 * J. Corbet <corbet@lwn.net>
968 #ifdef CONFIG_KALLSYMS
969 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
970 struct module
*mod
, char *buf
)
972 struct module_sect_attr
*sattr
=
973 container_of(mattr
, struct module_sect_attr
, mattr
);
974 return sprintf(buf
, "0x%lx\n", sattr
->address
);
977 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
981 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
982 kfree(sect_attrs
->attrs
[section
].name
);
986 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
987 char *secstrings
, Elf_Shdr
*sechdrs
)
989 unsigned int nloaded
= 0, i
, size
[2];
990 struct module_sect_attrs
*sect_attrs
;
991 struct module_sect_attr
*sattr
;
992 struct attribute
**gattr
;
994 /* Count loaded sections and allocate structures */
995 for (i
= 0; i
< nsect
; i
++)
996 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
998 size
[0] = ALIGN(sizeof(*sect_attrs
)
999 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1000 sizeof(sect_attrs
->grp
.attrs
[0]));
1001 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1002 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1003 if (sect_attrs
== NULL
)
1006 /* Setup section attributes. */
1007 sect_attrs
->grp
.name
= "sections";
1008 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1010 sect_attrs
->nsections
= 0;
1011 sattr
= §_attrs
->attrs
[0];
1012 gattr
= §_attrs
->grp
.attrs
[0];
1013 for (i
= 0; i
< nsect
; i
++) {
1014 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1016 sattr
->address
= sechdrs
[i
].sh_addr
;
1017 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1019 if (sattr
->name
== NULL
)
1021 sect_attrs
->nsections
++;
1022 sattr
->mattr
.show
= module_sect_show
;
1023 sattr
->mattr
.store
= NULL
;
1024 sattr
->mattr
.attr
.name
= sattr
->name
;
1025 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1026 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1030 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1033 mod
->sect_attrs
= sect_attrs
;
1036 free_sect_attrs(sect_attrs
);
1039 static void remove_sect_attrs(struct module
*mod
)
1041 if (mod
->sect_attrs
) {
1042 sysfs_remove_group(&mod
->mkobj
.kobj
,
1043 &mod
->sect_attrs
->grp
);
1044 /* We are positive that no one is using any sect attrs
1045 * at this point. Deallocate immediately. */
1046 free_sect_attrs(mod
->sect_attrs
);
1047 mod
->sect_attrs
= NULL
;
1052 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1055 struct module_notes_attrs
{
1056 struct kobject
*dir
;
1058 struct bin_attribute attrs
[0];
1061 static ssize_t
module_notes_read(struct kobject
*kobj
,
1062 struct bin_attribute
*bin_attr
,
1063 char *buf
, loff_t pos
, size_t count
)
1066 * The caller checked the pos and count against our size.
1068 memcpy(buf
, bin_attr
->private + pos
, count
);
1072 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1075 if (notes_attrs
->dir
) {
1077 sysfs_remove_bin_file(notes_attrs
->dir
,
1078 ¬es_attrs
->attrs
[i
]);
1079 kobject_del(notes_attrs
->dir
);
1084 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1085 char *secstrings
, Elf_Shdr
*sechdrs
)
1087 unsigned int notes
, loaded
, i
;
1088 struct module_notes_attrs
*notes_attrs
;
1089 struct bin_attribute
*nattr
;
1091 /* Count notes sections and allocate structures. */
1093 for (i
= 0; i
< nsect
; i
++)
1094 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1095 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1101 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1102 + notes
* sizeof(notes_attrs
->attrs
[0]),
1104 if (notes_attrs
== NULL
)
1107 notes_attrs
->notes
= notes
;
1108 nattr
= ¬es_attrs
->attrs
[0];
1109 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1110 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1112 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1113 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1114 nattr
->attr
.mode
= S_IRUGO
;
1115 nattr
->size
= sechdrs
[i
].sh_size
;
1116 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1117 nattr
->read
= module_notes_read
;
1123 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1124 if (!notes_attrs
->dir
)
1127 for (i
= 0; i
< notes
; ++i
)
1128 if (sysfs_create_bin_file(notes_attrs
->dir
,
1129 ¬es_attrs
->attrs
[i
]))
1132 mod
->notes_attrs
= notes_attrs
;
1136 free_notes_attrs(notes_attrs
, i
);
1139 static void remove_notes_attrs(struct module
*mod
)
1141 if (mod
->notes_attrs
)
1142 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1147 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1148 char *sectstrings
, Elf_Shdr
*sechdrs
)
1152 static inline void remove_sect_attrs(struct module
*mod
)
1156 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1157 char *sectstrings
, Elf_Shdr
*sechdrs
)
1161 static inline void remove_notes_attrs(struct module
*mod
)
1164 #endif /* CONFIG_KALLSYMS */
1167 int module_add_modinfo_attrs(struct module
*mod
)
1169 struct module_attribute
*attr
;
1170 struct module_attribute
*temp_attr
;
1174 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1175 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1177 if (!mod
->modinfo_attrs
)
1180 temp_attr
= mod
->modinfo_attrs
;
1181 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1183 (attr
->test
&& attr
->test(mod
))) {
1184 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1185 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1192 void module_remove_modinfo_attrs(struct module
*mod
)
1194 struct module_attribute
*attr
;
1197 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1198 /* pick a field to test for end of list */
1199 if (!attr
->attr
.name
)
1201 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1205 kfree(mod
->modinfo_attrs
);
1210 int mod_sysfs_init(struct module
*mod
)
1214 if (!module_sysfs_initialized
) {
1215 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1220 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1221 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1224 mod
->mkobj
.kobj
.kset
= module_kset
;
1225 mod
->mkobj
.kobj
.ktype
= &module_ktype
;
1226 mod
->mkobj
.mod
= mod
;
1228 kobject_init(&mod
->mkobj
.kobj
);
1234 int mod_sysfs_setup(struct module
*mod
,
1235 struct kernel_param
*kparam
,
1236 unsigned int num_params
)
1240 /* delay uevent until full sysfs population */
1241 err
= kobject_add(&mod
->mkobj
.kobj
);
1245 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1246 if (!mod
->holders_dir
) {
1251 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1253 goto out_unreg_holders
;
1255 err
= module_add_modinfo_attrs(mod
);
1257 goto out_unreg_param
;
1259 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1263 module_param_sysfs_remove(mod
);
1265 kobject_unregister(mod
->holders_dir
);
1267 kobject_del(&mod
->mkobj
.kobj
);
1268 kobject_put(&mod
->mkobj
.kobj
);
1274 static void mod_kobject_remove(struct module
*mod
)
1276 module_remove_modinfo_attrs(mod
);
1277 module_param_sysfs_remove(mod
);
1278 kobject_unregister(mod
->mkobj
.drivers_dir
);
1279 kobject_unregister(mod
->holders_dir
);
1280 kobject_unregister(&mod
->mkobj
.kobj
);
1284 * unlink the module with the whole machine is stopped with interrupts off
1285 * - this defends against kallsyms not taking locks
1287 static int __unlink_module(void *_mod
)
1289 struct module
*mod
= _mod
;
1290 list_del(&mod
->list
);
1294 /* Free a module, remove from lists, etc (must hold module_mutex). */
1295 static void free_module(struct module
*mod
)
1297 /* Delete from various lists */
1298 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1299 remove_notes_attrs(mod
);
1300 remove_sect_attrs(mod
);
1301 mod_kobject_remove(mod
);
1303 unwind_remove_table(mod
->unwind_info
, 0);
1305 /* Arch-specific cleanup. */
1306 module_arch_cleanup(mod
);
1308 /* Module unload stuff */
1309 module_unload_free(mod
);
1311 /* This may be NULL, but that's OK */
1312 module_free(mod
, mod
->module_init
);
1315 percpu_modfree(mod
->percpu
);
1317 /* Free lock-classes: */
1318 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1320 /* Finally, free the core (containing the module structure) */
1321 module_free(mod
, mod
->module_core
);
1324 void *__symbol_get(const char *symbol
)
1326 struct module
*owner
;
1327 unsigned long value
;
1328 const unsigned long *crc
;
1331 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1332 if (value
&& !strong_try_module_get(owner
))
1336 return (void *)value
;
1338 EXPORT_SYMBOL_GPL(__symbol_get
);
1341 * Ensure that an exported symbol [global namespace] does not already exist
1342 * in the kernel or in some other module's exported symbol table.
1344 static int verify_export_symbols(struct module
*mod
)
1346 const char *name
= NULL
;
1347 unsigned long i
, ret
= 0;
1348 struct module
*owner
;
1349 const unsigned long *crc
;
1351 for (i
= 0; i
< mod
->num_syms
; i
++)
1352 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1353 name
= mod
->syms
[i
].name
;
1358 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1359 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1360 name
= mod
->gpl_syms
[i
].name
;
1367 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1368 mod
->name
, name
, module_name(owner
));
1373 /* Change all symbols so that st_value encodes the pointer directly. */
1374 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1375 unsigned int symindex
,
1377 unsigned int versindex
,
1378 unsigned int pcpuindex
,
1381 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1382 unsigned long secbase
;
1383 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1386 for (i
= 1; i
< n
; i
++) {
1387 switch (sym
[i
].st_shndx
) {
1389 /* We compiled with -fno-common. These are not
1390 supposed to happen. */
1391 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1392 printk("%s: please compile with -fno-common\n",
1398 /* Don't need to do anything */
1399 DEBUGP("Absolute symbol: 0x%08lx\n",
1400 (long)sym
[i
].st_value
);
1405 = resolve_symbol(sechdrs
, versindex
,
1406 strtab
+ sym
[i
].st_name
, mod
);
1408 /* Ok if resolved. */
1409 if (sym
[i
].st_value
!= 0)
1412 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1415 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1416 mod
->name
, strtab
+ sym
[i
].st_name
);
1421 /* Divert to percpu allocation if a percpu var. */
1422 if (sym
[i
].st_shndx
== pcpuindex
)
1423 secbase
= (unsigned long)mod
->percpu
;
1425 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1426 sym
[i
].st_value
+= secbase
;
1434 /* Update size with this section: return offset. */
1435 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1439 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1440 *size
= ret
+ sechdr
->sh_size
;
1444 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1445 might -- code, read-only data, read-write data, small data. Tally
1446 sizes, and place the offsets into sh_entsize fields: high bit means it
1448 static void layout_sections(struct module
*mod
,
1449 const Elf_Ehdr
*hdr
,
1451 const char *secstrings
)
1453 static unsigned long const masks
[][2] = {
1454 /* NOTE: all executable code must be the first section
1455 * in this array; otherwise modify the text_size
1456 * finder in the two loops below */
1457 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1458 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1459 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1460 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1464 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1465 sechdrs
[i
].sh_entsize
= ~0UL;
1467 DEBUGP("Core section allocation order:\n");
1468 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1469 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1470 Elf_Shdr
*s
= &sechdrs
[i
];
1472 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1473 || (s
->sh_flags
& masks
[m
][1])
1474 || s
->sh_entsize
!= ~0UL
1475 || strncmp(secstrings
+ s
->sh_name
,
1478 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1479 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1482 mod
->core_text_size
= mod
->core_size
;
1485 DEBUGP("Init section allocation order:\n");
1486 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1487 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1488 Elf_Shdr
*s
= &sechdrs
[i
];
1490 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1491 || (s
->sh_flags
& masks
[m
][1])
1492 || s
->sh_entsize
!= ~0UL
1493 || strncmp(secstrings
+ s
->sh_name
,
1496 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1497 | INIT_OFFSET_MASK
);
1498 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1501 mod
->init_text_size
= mod
->init_size
;
1505 static void set_license(struct module
*mod
, const char *license
)
1508 license
= "unspecified";
1510 if (!license_is_gpl_compatible(license
)) {
1511 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1512 printk(KERN_WARNING
"%s: module license '%s' taints "
1513 "kernel.\n", mod
->name
, license
);
1514 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1518 /* Parse tag=value strings from .modinfo section */
1519 static char *next_string(char *string
, unsigned long *secsize
)
1521 /* Skip non-zero chars */
1524 if ((*secsize
)-- <= 1)
1528 /* Skip any zero padding. */
1529 while (!string
[0]) {
1531 if ((*secsize
)-- <= 1)
1537 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1542 unsigned int taglen
= strlen(tag
);
1543 unsigned long size
= sechdrs
[info
].sh_size
;
1545 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1546 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1547 return p
+ taglen
+ 1;
1552 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1553 unsigned int infoindex
)
1555 struct module_attribute
*attr
;
1558 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1561 get_modinfo(sechdrs
,
1567 #ifdef CONFIG_KALLSYMS
1568 static int is_exported(const char *name
, const struct module
*mod
)
1570 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1573 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1580 static char elf_type(const Elf_Sym
*sym
,
1582 const char *secstrings
,
1585 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1586 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1591 if (sym
->st_shndx
== SHN_UNDEF
)
1593 if (sym
->st_shndx
== SHN_ABS
)
1595 if (sym
->st_shndx
>= SHN_LORESERVE
)
1597 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1599 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1600 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1601 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1603 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1608 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1609 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1614 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1615 ".debug", strlen(".debug")) == 0)
1620 static void add_kallsyms(struct module
*mod
,
1622 unsigned int symindex
,
1623 unsigned int strindex
,
1624 const char *secstrings
)
1628 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1629 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1630 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1632 /* Set types up while we still have access to sections. */
1633 for (i
= 0; i
< mod
->num_symtab
; i
++)
1634 mod
->symtab
[i
].st_info
1635 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1638 static inline void add_kallsyms(struct module
*mod
,
1640 unsigned int symindex
,
1641 unsigned int strindex
,
1642 const char *secstrings
)
1645 #endif /* CONFIG_KALLSYMS */
1647 /* Allocate and load the module: note that size of section 0 is always
1648 zero, and we rely on this for optional sections. */
1649 static struct module
*load_module(void __user
*umod
,
1651 const char __user
*uargs
)
1655 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1657 unsigned int symindex
= 0;
1658 unsigned int strindex
= 0;
1659 unsigned int setupindex
;
1660 unsigned int exindex
;
1661 unsigned int exportindex
;
1662 unsigned int modindex
;
1663 unsigned int obsparmindex
;
1664 unsigned int infoindex
;
1665 unsigned int gplindex
;
1666 unsigned int crcindex
;
1667 unsigned int gplcrcindex
;
1668 unsigned int versindex
;
1669 unsigned int pcpuindex
;
1670 unsigned int gplfutureindex
;
1671 unsigned int gplfuturecrcindex
;
1672 unsigned int unwindex
= 0;
1673 unsigned int unusedindex
;
1674 unsigned int unusedcrcindex
;
1675 unsigned int unusedgplindex
;
1676 unsigned int unusedgplcrcindex
;
1677 unsigned int markersindex
;
1678 unsigned int markersstringsindex
;
1681 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1682 struct exception_table_entry
*extable
;
1683 mm_segment_t old_fs
;
1685 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1687 if (len
< sizeof(*hdr
))
1688 return ERR_PTR(-ENOEXEC
);
1690 /* Suck in entire file: we'll want most of it. */
1691 /* vmalloc barfs on "unusual" numbers. Check here */
1692 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1693 return ERR_PTR(-ENOMEM
);
1694 if (copy_from_user(hdr
, umod
, len
) != 0) {
1699 /* Sanity checks against insmoding binaries or wrong arch,
1700 weird elf version */
1701 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1702 || hdr
->e_type
!= ET_REL
1703 || !elf_check_arch(hdr
)
1704 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1709 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1712 /* Convenience variables */
1713 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1714 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1715 sechdrs
[0].sh_addr
= 0;
1717 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1718 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1719 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1722 /* Mark all sections sh_addr with their address in the
1724 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1726 /* Internal symbols and strings. */
1727 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1729 strindex
= sechdrs
[i
].sh_link
;
1730 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1732 #ifndef CONFIG_MODULE_UNLOAD
1733 /* Don't load .exit sections */
1734 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1735 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1739 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1740 ".gnu.linkonce.this_module");
1742 printk(KERN_WARNING
"No module found in object\n");
1746 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1748 if (symindex
== 0) {
1749 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1755 /* Optional sections */
1756 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1757 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1758 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1759 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1760 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1761 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1762 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1763 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1764 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1765 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1766 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1767 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1768 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1769 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1770 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1771 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1772 #ifdef ARCH_UNWIND_SECTION_NAME
1773 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1776 /* Don't keep modinfo section */
1777 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1778 #ifdef CONFIG_KALLSYMS
1779 /* Keep symbol and string tables for decoding later. */
1780 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1781 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1784 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1786 /* Check module struct version now, before we try to use module. */
1787 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1792 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1793 /* This is allowed: modprobe --force will invalidate it. */
1795 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1796 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1798 } else if (!same_magic(modmagic
, vermagic
)) {
1799 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1800 mod
->name
, modmagic
, vermagic
);
1805 /* Now copy in args */
1806 args
= strndup_user(uargs
, ~0UL >> 1);
1808 err
= PTR_ERR(args
);
1812 if (find_module(mod
->name
)) {
1817 mod
->state
= MODULE_STATE_COMING
;
1819 /* Allow arches to frob section contents and sizes. */
1820 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1825 /* We have a special allocation for this section. */
1826 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1827 sechdrs
[pcpuindex
].sh_addralign
,
1833 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1834 mod
->percpu
= percpu
;
1837 /* Determine total sizes, and put offsets in sh_entsize. For now
1838 this is done generically; there doesn't appear to be any
1839 special cases for the architectures. */
1840 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1842 /* Do the allocs. */
1843 ptr
= module_alloc(mod
->core_size
);
1848 memset(ptr
, 0, mod
->core_size
);
1849 mod
->module_core
= ptr
;
1851 ptr
= module_alloc(mod
->init_size
);
1852 if (!ptr
&& mod
->init_size
) {
1856 memset(ptr
, 0, mod
->init_size
);
1857 mod
->module_init
= ptr
;
1859 /* Transfer each section which specifies SHF_ALLOC */
1860 DEBUGP("final section addresses:\n");
1861 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1864 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1867 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1868 dest
= mod
->module_init
1869 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1871 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1873 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1874 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1875 sechdrs
[i
].sh_size
);
1876 /* Update sh_addr to point to copy in image. */
1877 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1878 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1880 /* Module has been moved. */
1881 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1883 /* Now we've moved module, initialize linked lists, etc. */
1884 module_unload_init(mod
);
1886 /* Initialize kobject, so we can reference it. */
1887 err
= mod_sysfs_init(mod
);
1891 /* Set up license info based on the info section */
1892 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1894 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1895 add_taint(TAINT_PROPRIETARY_MODULE
);
1896 if (strcmp(mod
->name
, "driverloader") == 0)
1897 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1899 /* Set up MODINFO_ATTR fields */
1900 setup_modinfo(mod
, sechdrs
, infoindex
);
1902 /* Fix up syms, so that st_value is a pointer to location. */
1903 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1908 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1909 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1910 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1912 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1913 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1914 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1916 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1917 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1918 sizeof(*mod
->gpl_future_syms
);
1919 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1920 sizeof(*mod
->unused_syms
);
1921 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1922 sizeof(*mod
->unused_gpl_syms
);
1923 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1924 if (gplfuturecrcindex
)
1925 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1927 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1929 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1930 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1931 if (unusedgplcrcindex
)
1932 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1934 #ifdef CONFIG_MODVERSIONS
1935 if ((mod
->num_syms
&& !crcindex
) ||
1936 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1937 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1938 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1939 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1940 printk(KERN_WARNING
"%s: No versions for exported symbols."
1941 " Tainting kernel.\n", mod
->name
);
1942 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1945 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
1946 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
1947 "__markers_strings");
1949 /* Now do relocations. */
1950 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1951 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1952 unsigned int info
= sechdrs
[i
].sh_info
;
1954 /* Not a valid relocation section? */
1955 if (info
>= hdr
->e_shnum
)
1958 /* Don't bother with non-allocated sections */
1959 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1962 if (sechdrs
[i
].sh_type
== SHT_REL
)
1963 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1964 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1965 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1970 #ifdef CONFIG_MARKERS
1971 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
1973 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
1976 /* Find duplicate symbols */
1977 err
= verify_export_symbols(mod
);
1982 /* Set up and sort exception table */
1983 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1984 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1985 sort_extable(extable
, extable
+ mod
->num_exentries
);
1987 /* Finally, copy percpu area over. */
1988 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1989 sechdrs
[pcpuindex
].sh_size
);
1991 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1993 #ifdef CONFIG_MARKERS
1995 marker_update_probe_range(mod
->markers
,
1996 mod
->markers
+ mod
->num_markers
, NULL
, NULL
);
1998 err
= module_finalize(hdr
, sechdrs
, mod
);
2002 /* flush the icache in correct context */
2007 * Flush the instruction cache, since we've played with text.
2008 * Do it before processing of module parameters, so the module
2009 * can provide parameter accessor functions of its own.
2011 if (mod
->module_init
)
2012 flush_icache_range((unsigned long)mod
->module_init
,
2013 (unsigned long)mod
->module_init
2015 flush_icache_range((unsigned long)mod
->module_core
,
2016 (unsigned long)mod
->module_core
+ mod
->core_size
);
2022 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2025 /* Size of section 0 is 0, so this works well if no params */
2026 err
= parse_args(mod
->name
, mod
->args
,
2027 (struct kernel_param
*)
2028 sechdrs
[setupindex
].sh_addr
,
2029 sechdrs
[setupindex
].sh_size
2030 / sizeof(struct kernel_param
),
2035 err
= mod_sysfs_setup(mod
,
2036 (struct kernel_param
*)
2037 sechdrs
[setupindex
].sh_addr
,
2038 sechdrs
[setupindex
].sh_size
2039 / sizeof(struct kernel_param
));
2042 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2043 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2045 /* Size of section 0 is 0, so this works well if no unwind info. */
2046 mod
->unwind_info
= unwind_add_table(mod
,
2047 (void *)sechdrs
[unwindex
].sh_addr
,
2048 sechdrs
[unwindex
].sh_size
);
2050 /* Get rid of temporary copy */
2057 module_arch_cleanup(mod
);
2059 module_unload_free(mod
);
2060 module_free(mod
, mod
->module_init
);
2062 module_free(mod
, mod
->module_core
);
2065 percpu_modfree(percpu
);
2070 return ERR_PTR(err
);
2073 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2079 * link the module with the whole machine is stopped with interrupts off
2080 * - this defends against kallsyms not taking locks
2082 static int __link_module(void *_mod
)
2084 struct module
*mod
= _mod
;
2085 list_add(&mod
->list
, &modules
);
2089 /* This is where the real work happens */
2091 sys_init_module(void __user
*umod
,
2093 const char __user
*uargs
)
2098 /* Must have permission */
2099 if (!capable(CAP_SYS_MODULE
))
2102 /* Only one module load at a time, please */
2103 if (mutex_lock_interruptible(&module_mutex
) != 0)
2106 /* Do all the hard work */
2107 mod
= load_module(umod
, len
, uargs
);
2109 mutex_unlock(&module_mutex
);
2110 return PTR_ERR(mod
);
2113 /* Now sew it into the lists. They won't access us, since
2114 strong_try_module_get() will fail. */
2115 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2117 /* Drop lock so they can recurse */
2118 mutex_unlock(&module_mutex
);
2120 blocking_notifier_call_chain(&module_notify_list
,
2121 MODULE_STATE_COMING
, mod
);
2123 /* Start the module */
2124 if (mod
->init
!= NULL
)
2127 /* Init routine failed: abort. Try to protect us from
2128 buggy refcounters. */
2129 mod
->state
= MODULE_STATE_GOING
;
2130 synchronize_sched();
2132 mutex_lock(&module_mutex
);
2134 mutex_unlock(&module_mutex
);
2138 /* Now it's a first class citizen! */
2139 mutex_lock(&module_mutex
);
2140 mod
->state
= MODULE_STATE_LIVE
;
2141 /* Drop initial reference. */
2143 unwind_remove_table(mod
->unwind_info
, 1);
2144 module_free(mod
, mod
->module_init
);
2145 mod
->module_init
= NULL
;
2147 mod
->init_text_size
= 0;
2148 mutex_unlock(&module_mutex
);
2153 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2155 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2158 #ifdef CONFIG_KALLSYMS
2160 * This ignores the intensely annoying "mapping symbols" found
2161 * in ARM ELF files: $a, $t and $d.
2163 static inline int is_arm_mapping_symbol(const char *str
)
2165 return str
[0] == '$' && strchr("atd", str
[1])
2166 && (str
[2] == '\0' || str
[2] == '.');
2169 static const char *get_ksymbol(struct module
*mod
,
2171 unsigned long *size
,
2172 unsigned long *offset
)
2174 unsigned int i
, best
= 0;
2175 unsigned long nextval
;
2177 /* At worse, next value is at end of module */
2178 if (within(addr
, mod
->module_init
, mod
->init_size
))
2179 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2181 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2183 /* Scan for closest preceeding symbol, and next symbol. (ELF
2184 starts real symbols at 1). */
2185 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2186 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2189 /* We ignore unnamed symbols: they're uninformative
2190 * and inserted at a whim. */
2191 if (mod
->symtab
[i
].st_value
<= addr
2192 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2193 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2194 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2196 if (mod
->symtab
[i
].st_value
> addr
2197 && mod
->symtab
[i
].st_value
< nextval
2198 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2199 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2200 nextval
= mod
->symtab
[i
].st_value
;
2207 *size
= nextval
- mod
->symtab
[best
].st_value
;
2209 *offset
= addr
- mod
->symtab
[best
].st_value
;
2210 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2213 /* For kallsyms to ask for address resolution. NULL means not found.
2214 We don't lock, as this is used for oops resolution and races are a
2216 /* FIXME: Risky: returns a pointer into a module w/o lock */
2217 const char *module_address_lookup(unsigned long addr
,
2218 unsigned long *size
,
2219 unsigned long *offset
,
2223 const char *ret
= NULL
;
2226 list_for_each_entry(mod
, &modules
, list
) {
2227 if (within(addr
, mod
->module_init
, mod
->init_size
)
2228 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2230 *modname
= mod
->name
;
2231 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2239 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2244 list_for_each_entry(mod
, &modules
, list
) {
2245 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2246 within(addr
, mod
->module_core
, mod
->core_size
)) {
2249 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2252 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2262 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2263 unsigned long *offset
, char *modname
, char *name
)
2268 list_for_each_entry(mod
, &modules
, list
) {
2269 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2270 within(addr
, mod
->module_core
, mod
->core_size
)) {
2273 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2277 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2279 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2289 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2290 char *name
, char *module_name
, int *exported
)
2295 list_for_each_entry(mod
, &modules
, list
) {
2296 if (symnum
< mod
->num_symtab
) {
2297 *value
= mod
->symtab
[symnum
].st_value
;
2298 *type
= mod
->symtab
[symnum
].st_info
;
2299 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2301 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2302 *exported
= is_exported(name
, mod
);
2306 symnum
-= mod
->num_symtab
;
2312 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2316 for (i
= 0; i
< mod
->num_symtab
; i
++)
2317 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2318 mod
->symtab
[i
].st_info
!= 'U')
2319 return mod
->symtab
[i
].st_value
;
2323 /* Look for this name: can be of form module:name. */
2324 unsigned long module_kallsyms_lookup_name(const char *name
)
2328 unsigned long ret
= 0;
2330 /* Don't lock: we're in enough trouble already. */
2332 if ((colon
= strchr(name
, ':')) != NULL
) {
2334 if ((mod
= find_module(name
)) != NULL
)
2335 ret
= mod_find_symname(mod
, colon
+1);
2338 list_for_each_entry(mod
, &modules
, list
)
2339 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2345 #endif /* CONFIG_KALLSYMS */
2347 /* Called by the /proc file system to return a list of modules. */
2348 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2350 mutex_lock(&module_mutex
);
2351 return seq_list_start(&modules
, *pos
);
2354 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2356 return seq_list_next(p
, &modules
, pos
);
2359 static void m_stop(struct seq_file
*m
, void *p
)
2361 mutex_unlock(&module_mutex
);
2364 static char *taint_flags(unsigned int taints
, char *buf
)
2370 if (taints
& TAINT_PROPRIETARY_MODULE
)
2372 if (taints
& TAINT_FORCED_MODULE
)
2375 * TAINT_FORCED_RMMOD: could be added.
2376 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2386 static int m_show(struct seq_file
*m
, void *p
)
2388 struct module
*mod
= list_entry(p
, struct module
, list
);
2391 seq_printf(m
, "%s %lu",
2392 mod
->name
, mod
->init_size
+ mod
->core_size
);
2393 print_unload_info(m
, mod
);
2395 /* Informative for users. */
2396 seq_printf(m
, " %s",
2397 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2398 mod
->state
== MODULE_STATE_COMING
? "Loading":
2400 /* Used by oprofile and other similar tools. */
2401 seq_printf(m
, " 0x%p", mod
->module_core
);
2405 seq_printf(m
, " %s", taint_flags(mod
->taints
, buf
));
2407 seq_printf(m
, "\n");
2411 /* Format: modulename size refcount deps address
2413 Where refcount is a number or -, and deps is a comma-separated list
2416 const struct seq_operations modules_op
= {
2423 /* Given an address, look for it in the module exception tables. */
2424 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2426 const struct exception_table_entry
*e
= NULL
;
2430 list_for_each_entry(mod
, &modules
, list
) {
2431 if (mod
->num_exentries
== 0)
2434 e
= search_extable(mod
->extable
,
2435 mod
->extable
+ mod
->num_exentries
- 1,
2442 /* Now, if we found one, we are running inside it now, hence
2443 we cannot unload the module, hence no refcnt needed. */
2448 * Is this a valid module address?
2450 int is_module_address(unsigned long addr
)
2456 list_for_each_entry(mod
, &modules
, list
) {
2457 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2469 /* Is this a valid kernel address? */
2470 struct module
*__module_text_address(unsigned long addr
)
2474 list_for_each_entry(mod
, &modules
, list
)
2475 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2476 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2481 struct module
*module_text_address(unsigned long addr
)
2486 mod
= __module_text_address(addr
);
2492 /* Don't grab lock, we're oopsing. */
2493 void print_modules(void)
2498 printk("Modules linked in:");
2499 list_for_each_entry(mod
, &modules
, list
)
2500 printk(" %s%s", mod
->name
, taint_flags(mod
->taints
, buf
));
2504 #ifdef CONFIG_MODVERSIONS
2505 /* Generate the signature for struct module here, too, for modversions. */
2506 void struct_module(struct module
*mod
) { return; }
2507 EXPORT_SYMBOL(struct_module
);
2510 #ifdef CONFIG_MARKERS
2511 void module_update_markers(struct module
*probe_module
, int *refcount
)
2515 mutex_lock(&module_mutex
);
2516 list_for_each_entry(mod
, &modules
, list
)
2518 marker_update_probe_range(mod
->markers
,
2519 mod
->markers
+ mod
->num_markers
,
2520 probe_module
, refcount
);
2521 mutex_unlock(&module_mutex
);