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 mod
->mkobj
.mod
= mod
;
1222 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1223 mod
->mkobj
.kobj
.kset
= module_kset
;
1224 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1227 kobject_put(&mod
->mkobj
.kobj
);
1229 /* delay uevent until full sysfs population */
1234 int mod_sysfs_setup(struct module
*mod
,
1235 struct kernel_param
*kparam
,
1236 unsigned int num_params
)
1240 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1241 if (!mod
->holders_dir
) {
1246 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1248 goto out_unreg_holders
;
1250 err
= module_add_modinfo_attrs(mod
);
1252 goto out_unreg_param
;
1254 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1258 module_param_sysfs_remove(mod
);
1260 kobject_put(mod
->holders_dir
);
1262 kobject_put(&mod
->mkobj
.kobj
);
1267 static void mod_kobject_remove(struct module
*mod
)
1269 module_remove_modinfo_attrs(mod
);
1270 module_param_sysfs_remove(mod
);
1271 kobject_put(mod
->mkobj
.drivers_dir
);
1272 kobject_put(mod
->holders_dir
);
1273 kobject_put(&mod
->mkobj
.kobj
);
1277 * unlink the module with the whole machine is stopped with interrupts off
1278 * - this defends against kallsyms not taking locks
1280 static int __unlink_module(void *_mod
)
1282 struct module
*mod
= _mod
;
1283 list_del(&mod
->list
);
1287 /* Free a module, remove from lists, etc (must hold module_mutex). */
1288 static void free_module(struct module
*mod
)
1290 /* Delete from various lists */
1291 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1292 remove_notes_attrs(mod
);
1293 remove_sect_attrs(mod
);
1294 mod_kobject_remove(mod
);
1296 unwind_remove_table(mod
->unwind_info
, 0);
1298 /* Arch-specific cleanup. */
1299 module_arch_cleanup(mod
);
1301 /* Module unload stuff */
1302 module_unload_free(mod
);
1304 /* This may be NULL, but that's OK */
1305 module_free(mod
, mod
->module_init
);
1308 percpu_modfree(mod
->percpu
);
1310 /* Free lock-classes: */
1311 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1313 /* Finally, free the core (containing the module structure) */
1314 module_free(mod
, mod
->module_core
);
1317 void *__symbol_get(const char *symbol
)
1319 struct module
*owner
;
1320 unsigned long value
;
1321 const unsigned long *crc
;
1324 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1325 if (value
&& !strong_try_module_get(owner
))
1329 return (void *)value
;
1331 EXPORT_SYMBOL_GPL(__symbol_get
);
1334 * Ensure that an exported symbol [global namespace] does not already exist
1335 * in the kernel or in some other module's exported symbol table.
1337 static int verify_export_symbols(struct module
*mod
)
1339 const char *name
= NULL
;
1340 unsigned long i
, ret
= 0;
1341 struct module
*owner
;
1342 const unsigned long *crc
;
1344 for (i
= 0; i
< mod
->num_syms
; i
++)
1345 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1346 name
= mod
->syms
[i
].name
;
1351 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1352 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1353 name
= mod
->gpl_syms
[i
].name
;
1360 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1361 mod
->name
, name
, module_name(owner
));
1366 /* Change all symbols so that st_value encodes the pointer directly. */
1367 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1368 unsigned int symindex
,
1370 unsigned int versindex
,
1371 unsigned int pcpuindex
,
1374 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1375 unsigned long secbase
;
1376 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1379 for (i
= 1; i
< n
; i
++) {
1380 switch (sym
[i
].st_shndx
) {
1382 /* We compiled with -fno-common. These are not
1383 supposed to happen. */
1384 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1385 printk("%s: please compile with -fno-common\n",
1391 /* Don't need to do anything */
1392 DEBUGP("Absolute symbol: 0x%08lx\n",
1393 (long)sym
[i
].st_value
);
1398 = resolve_symbol(sechdrs
, versindex
,
1399 strtab
+ sym
[i
].st_name
, mod
);
1401 /* Ok if resolved. */
1402 if (sym
[i
].st_value
!= 0)
1405 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1408 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1409 mod
->name
, strtab
+ sym
[i
].st_name
);
1414 /* Divert to percpu allocation if a percpu var. */
1415 if (sym
[i
].st_shndx
== pcpuindex
)
1416 secbase
= (unsigned long)mod
->percpu
;
1418 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1419 sym
[i
].st_value
+= secbase
;
1427 /* Update size with this section: return offset. */
1428 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1432 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1433 *size
= ret
+ sechdr
->sh_size
;
1437 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1438 might -- code, read-only data, read-write data, small data. Tally
1439 sizes, and place the offsets into sh_entsize fields: high bit means it
1441 static void layout_sections(struct module
*mod
,
1442 const Elf_Ehdr
*hdr
,
1444 const char *secstrings
)
1446 static unsigned long const masks
[][2] = {
1447 /* NOTE: all executable code must be the first section
1448 * in this array; otherwise modify the text_size
1449 * finder in the two loops below */
1450 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1451 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1452 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1453 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1457 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1458 sechdrs
[i
].sh_entsize
= ~0UL;
1460 DEBUGP("Core section allocation order:\n");
1461 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1462 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1463 Elf_Shdr
*s
= &sechdrs
[i
];
1465 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1466 || (s
->sh_flags
& masks
[m
][1])
1467 || s
->sh_entsize
!= ~0UL
1468 || strncmp(secstrings
+ s
->sh_name
,
1471 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1472 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1475 mod
->core_text_size
= mod
->core_size
;
1478 DEBUGP("Init section allocation order:\n");
1479 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1480 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1481 Elf_Shdr
*s
= &sechdrs
[i
];
1483 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1484 || (s
->sh_flags
& masks
[m
][1])
1485 || s
->sh_entsize
!= ~0UL
1486 || strncmp(secstrings
+ s
->sh_name
,
1489 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1490 | INIT_OFFSET_MASK
);
1491 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1494 mod
->init_text_size
= mod
->init_size
;
1498 static void set_license(struct module
*mod
, const char *license
)
1501 license
= "unspecified";
1503 if (!license_is_gpl_compatible(license
)) {
1504 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1505 printk(KERN_WARNING
"%s: module license '%s' taints "
1506 "kernel.\n", mod
->name
, license
);
1507 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1511 /* Parse tag=value strings from .modinfo section */
1512 static char *next_string(char *string
, unsigned long *secsize
)
1514 /* Skip non-zero chars */
1517 if ((*secsize
)-- <= 1)
1521 /* Skip any zero padding. */
1522 while (!string
[0]) {
1524 if ((*secsize
)-- <= 1)
1530 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1535 unsigned int taglen
= strlen(tag
);
1536 unsigned long size
= sechdrs
[info
].sh_size
;
1538 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1539 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1540 return p
+ taglen
+ 1;
1545 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1546 unsigned int infoindex
)
1548 struct module_attribute
*attr
;
1551 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1554 get_modinfo(sechdrs
,
1560 #ifdef CONFIG_KALLSYMS
1561 static int is_exported(const char *name
, const struct module
*mod
)
1563 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1566 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1573 static char elf_type(const Elf_Sym
*sym
,
1575 const char *secstrings
,
1578 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1579 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1584 if (sym
->st_shndx
== SHN_UNDEF
)
1586 if (sym
->st_shndx
== SHN_ABS
)
1588 if (sym
->st_shndx
>= SHN_LORESERVE
)
1590 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1592 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1593 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1594 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1596 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1601 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1602 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1607 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1608 ".debug", strlen(".debug")) == 0)
1613 static void add_kallsyms(struct module
*mod
,
1615 unsigned int symindex
,
1616 unsigned int strindex
,
1617 const char *secstrings
)
1621 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1622 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1623 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1625 /* Set types up while we still have access to sections. */
1626 for (i
= 0; i
< mod
->num_symtab
; i
++)
1627 mod
->symtab
[i
].st_info
1628 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1631 static inline void add_kallsyms(struct module
*mod
,
1633 unsigned int symindex
,
1634 unsigned int strindex
,
1635 const char *secstrings
)
1638 #endif /* CONFIG_KALLSYMS */
1640 /* Allocate and load the module: note that size of section 0 is always
1641 zero, and we rely on this for optional sections. */
1642 static struct module
*load_module(void __user
*umod
,
1644 const char __user
*uargs
)
1648 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1650 unsigned int symindex
= 0;
1651 unsigned int strindex
= 0;
1652 unsigned int setupindex
;
1653 unsigned int exindex
;
1654 unsigned int exportindex
;
1655 unsigned int modindex
;
1656 unsigned int obsparmindex
;
1657 unsigned int infoindex
;
1658 unsigned int gplindex
;
1659 unsigned int crcindex
;
1660 unsigned int gplcrcindex
;
1661 unsigned int versindex
;
1662 unsigned int pcpuindex
;
1663 unsigned int gplfutureindex
;
1664 unsigned int gplfuturecrcindex
;
1665 unsigned int unwindex
= 0;
1666 unsigned int unusedindex
;
1667 unsigned int unusedcrcindex
;
1668 unsigned int unusedgplindex
;
1669 unsigned int unusedgplcrcindex
;
1670 unsigned int markersindex
;
1671 unsigned int markersstringsindex
;
1674 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1675 struct exception_table_entry
*extable
;
1676 mm_segment_t old_fs
;
1678 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1680 if (len
< sizeof(*hdr
))
1681 return ERR_PTR(-ENOEXEC
);
1683 /* Suck in entire file: we'll want most of it. */
1684 /* vmalloc barfs on "unusual" numbers. Check here */
1685 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1686 return ERR_PTR(-ENOMEM
);
1687 if (copy_from_user(hdr
, umod
, len
) != 0) {
1692 /* Sanity checks against insmoding binaries or wrong arch,
1693 weird elf version */
1694 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1695 || hdr
->e_type
!= ET_REL
1696 || !elf_check_arch(hdr
)
1697 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1702 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1705 /* Convenience variables */
1706 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1707 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1708 sechdrs
[0].sh_addr
= 0;
1710 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1711 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1712 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1715 /* Mark all sections sh_addr with their address in the
1717 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1719 /* Internal symbols and strings. */
1720 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1722 strindex
= sechdrs
[i
].sh_link
;
1723 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1725 #ifndef CONFIG_MODULE_UNLOAD
1726 /* Don't load .exit sections */
1727 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1728 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1732 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1733 ".gnu.linkonce.this_module");
1735 printk(KERN_WARNING
"No module found in object\n");
1739 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1741 if (symindex
== 0) {
1742 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1748 /* Optional sections */
1749 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1750 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1751 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1752 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1753 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1754 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1755 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1756 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1757 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1758 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1759 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1760 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1761 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1762 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1763 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1764 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1765 #ifdef ARCH_UNWIND_SECTION_NAME
1766 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1769 /* Don't keep modinfo section */
1770 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1771 #ifdef CONFIG_KALLSYMS
1772 /* Keep symbol and string tables for decoding later. */
1773 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1774 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1777 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1779 /* Check module struct version now, before we try to use module. */
1780 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1785 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1786 /* This is allowed: modprobe --force will invalidate it. */
1788 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1789 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1791 } else if (!same_magic(modmagic
, vermagic
)) {
1792 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1793 mod
->name
, modmagic
, vermagic
);
1798 /* Now copy in args */
1799 args
= strndup_user(uargs
, ~0UL >> 1);
1801 err
= PTR_ERR(args
);
1805 if (find_module(mod
->name
)) {
1810 mod
->state
= MODULE_STATE_COMING
;
1812 /* Allow arches to frob section contents and sizes. */
1813 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1818 /* We have a special allocation for this section. */
1819 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1820 sechdrs
[pcpuindex
].sh_addralign
,
1826 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1827 mod
->percpu
= percpu
;
1830 /* Determine total sizes, and put offsets in sh_entsize. For now
1831 this is done generically; there doesn't appear to be any
1832 special cases for the architectures. */
1833 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1835 /* Do the allocs. */
1836 ptr
= module_alloc(mod
->core_size
);
1841 memset(ptr
, 0, mod
->core_size
);
1842 mod
->module_core
= ptr
;
1844 ptr
= module_alloc(mod
->init_size
);
1845 if (!ptr
&& mod
->init_size
) {
1849 memset(ptr
, 0, mod
->init_size
);
1850 mod
->module_init
= ptr
;
1852 /* Transfer each section which specifies SHF_ALLOC */
1853 DEBUGP("final section addresses:\n");
1854 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1857 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1860 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1861 dest
= mod
->module_init
1862 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1864 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1866 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1867 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1868 sechdrs
[i
].sh_size
);
1869 /* Update sh_addr to point to copy in image. */
1870 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1871 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1873 /* Module has been moved. */
1874 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1876 /* Now we've moved module, initialize linked lists, etc. */
1877 module_unload_init(mod
);
1879 /* add kobject, so we can reference it. */
1880 err
= mod_sysfs_init(mod
);
1884 /* Set up license info based on the info section */
1885 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1887 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1888 add_taint(TAINT_PROPRIETARY_MODULE
);
1889 if (strcmp(mod
->name
, "driverloader") == 0)
1890 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1892 /* Set up MODINFO_ATTR fields */
1893 setup_modinfo(mod
, sechdrs
, infoindex
);
1895 /* Fix up syms, so that st_value is a pointer to location. */
1896 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1901 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1902 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1903 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1905 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1906 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1907 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1909 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1910 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1911 sizeof(*mod
->gpl_future_syms
);
1912 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1913 sizeof(*mod
->unused_syms
);
1914 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1915 sizeof(*mod
->unused_gpl_syms
);
1916 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1917 if (gplfuturecrcindex
)
1918 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1920 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1922 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1923 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1924 if (unusedgplcrcindex
)
1925 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1927 #ifdef CONFIG_MODVERSIONS
1928 if ((mod
->num_syms
&& !crcindex
) ||
1929 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1930 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1931 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1932 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1933 printk(KERN_WARNING
"%s: No versions for exported symbols."
1934 " Tainting kernel.\n", mod
->name
);
1935 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1938 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
1939 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
1940 "__markers_strings");
1942 /* Now do relocations. */
1943 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1944 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1945 unsigned int info
= sechdrs
[i
].sh_info
;
1947 /* Not a valid relocation section? */
1948 if (info
>= hdr
->e_shnum
)
1951 /* Don't bother with non-allocated sections */
1952 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1955 if (sechdrs
[i
].sh_type
== SHT_REL
)
1956 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1957 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1958 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1963 #ifdef CONFIG_MARKERS
1964 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
1966 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
1969 /* Find duplicate symbols */
1970 err
= verify_export_symbols(mod
);
1975 /* Set up and sort exception table */
1976 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1977 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1978 sort_extable(extable
, extable
+ mod
->num_exentries
);
1980 /* Finally, copy percpu area over. */
1981 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1982 sechdrs
[pcpuindex
].sh_size
);
1984 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1986 #ifdef CONFIG_MARKERS
1988 marker_update_probe_range(mod
->markers
,
1989 mod
->markers
+ mod
->num_markers
, NULL
, NULL
);
1991 err
= module_finalize(hdr
, sechdrs
, mod
);
1995 /* flush the icache in correct context */
2000 * Flush the instruction cache, since we've played with text.
2001 * Do it before processing of module parameters, so the module
2002 * can provide parameter accessor functions of its own.
2004 if (mod
->module_init
)
2005 flush_icache_range((unsigned long)mod
->module_init
,
2006 (unsigned long)mod
->module_init
2008 flush_icache_range((unsigned long)mod
->module_core
,
2009 (unsigned long)mod
->module_core
+ mod
->core_size
);
2015 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2018 /* Size of section 0 is 0, so this works well if no params */
2019 err
= parse_args(mod
->name
, mod
->args
,
2020 (struct kernel_param
*)
2021 sechdrs
[setupindex
].sh_addr
,
2022 sechdrs
[setupindex
].sh_size
2023 / sizeof(struct kernel_param
),
2028 err
= mod_sysfs_setup(mod
,
2029 (struct kernel_param
*)
2030 sechdrs
[setupindex
].sh_addr
,
2031 sechdrs
[setupindex
].sh_size
2032 / sizeof(struct kernel_param
));
2035 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2036 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2038 /* Size of section 0 is 0, so this works well if no unwind info. */
2039 mod
->unwind_info
= unwind_add_table(mod
,
2040 (void *)sechdrs
[unwindex
].sh_addr
,
2041 sechdrs
[unwindex
].sh_size
);
2043 /* Get rid of temporary copy */
2050 module_arch_cleanup(mod
);
2052 kobject_del(&mod
->mkobj
.kobj
);
2053 kobject_put(&mod
->mkobj
.kobj
);
2055 module_unload_free(mod
);
2056 module_free(mod
, mod
->module_init
);
2058 module_free(mod
, mod
->module_core
);
2061 percpu_modfree(percpu
);
2066 return ERR_PTR(err
);
2069 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2075 * link the module with the whole machine is stopped with interrupts off
2076 * - this defends against kallsyms not taking locks
2078 static int __link_module(void *_mod
)
2080 struct module
*mod
= _mod
;
2081 list_add(&mod
->list
, &modules
);
2085 /* This is where the real work happens */
2087 sys_init_module(void __user
*umod
,
2089 const char __user
*uargs
)
2094 /* Must have permission */
2095 if (!capable(CAP_SYS_MODULE
))
2098 /* Only one module load at a time, please */
2099 if (mutex_lock_interruptible(&module_mutex
) != 0)
2102 /* Do all the hard work */
2103 mod
= load_module(umod
, len
, uargs
);
2105 mutex_unlock(&module_mutex
);
2106 return PTR_ERR(mod
);
2109 /* Now sew it into the lists. They won't access us, since
2110 strong_try_module_get() will fail. */
2111 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2113 /* Drop lock so they can recurse */
2114 mutex_unlock(&module_mutex
);
2116 blocking_notifier_call_chain(&module_notify_list
,
2117 MODULE_STATE_COMING
, mod
);
2119 /* Start the module */
2120 if (mod
->init
!= NULL
)
2123 /* Init routine failed: abort. Try to protect us from
2124 buggy refcounters. */
2125 mod
->state
= MODULE_STATE_GOING
;
2126 synchronize_sched();
2128 mutex_lock(&module_mutex
);
2130 mutex_unlock(&module_mutex
);
2134 /* Now it's a first class citizen! */
2135 mutex_lock(&module_mutex
);
2136 mod
->state
= MODULE_STATE_LIVE
;
2137 /* Drop initial reference. */
2139 unwind_remove_table(mod
->unwind_info
, 1);
2140 module_free(mod
, mod
->module_init
);
2141 mod
->module_init
= NULL
;
2143 mod
->init_text_size
= 0;
2144 mutex_unlock(&module_mutex
);
2149 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2151 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2154 #ifdef CONFIG_KALLSYMS
2156 * This ignores the intensely annoying "mapping symbols" found
2157 * in ARM ELF files: $a, $t and $d.
2159 static inline int is_arm_mapping_symbol(const char *str
)
2161 return str
[0] == '$' && strchr("atd", str
[1])
2162 && (str
[2] == '\0' || str
[2] == '.');
2165 static const char *get_ksymbol(struct module
*mod
,
2167 unsigned long *size
,
2168 unsigned long *offset
)
2170 unsigned int i
, best
= 0;
2171 unsigned long nextval
;
2173 /* At worse, next value is at end of module */
2174 if (within(addr
, mod
->module_init
, mod
->init_size
))
2175 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2177 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2179 /* Scan for closest preceeding symbol, and next symbol. (ELF
2180 starts real symbols at 1). */
2181 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2182 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2185 /* We ignore unnamed symbols: they're uninformative
2186 * and inserted at a whim. */
2187 if (mod
->symtab
[i
].st_value
<= addr
2188 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2189 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2190 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2192 if (mod
->symtab
[i
].st_value
> addr
2193 && mod
->symtab
[i
].st_value
< nextval
2194 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2195 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2196 nextval
= mod
->symtab
[i
].st_value
;
2203 *size
= nextval
- mod
->symtab
[best
].st_value
;
2205 *offset
= addr
- mod
->symtab
[best
].st_value
;
2206 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2209 /* For kallsyms to ask for address resolution. NULL means not found.
2210 We don't lock, as this is used for oops resolution and races are a
2212 /* FIXME: Risky: returns a pointer into a module w/o lock */
2213 const char *module_address_lookup(unsigned long addr
,
2214 unsigned long *size
,
2215 unsigned long *offset
,
2219 const char *ret
= NULL
;
2222 list_for_each_entry(mod
, &modules
, list
) {
2223 if (within(addr
, mod
->module_init
, mod
->init_size
)
2224 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2226 *modname
= mod
->name
;
2227 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2235 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2240 list_for_each_entry(mod
, &modules
, list
) {
2241 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2242 within(addr
, mod
->module_core
, mod
->core_size
)) {
2245 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2248 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2258 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2259 unsigned long *offset
, char *modname
, char *name
)
2264 list_for_each_entry(mod
, &modules
, list
) {
2265 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2266 within(addr
, mod
->module_core
, mod
->core_size
)) {
2269 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2273 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2275 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2285 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2286 char *name
, char *module_name
, int *exported
)
2291 list_for_each_entry(mod
, &modules
, list
) {
2292 if (symnum
< mod
->num_symtab
) {
2293 *value
= mod
->symtab
[symnum
].st_value
;
2294 *type
= mod
->symtab
[symnum
].st_info
;
2295 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2297 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2298 *exported
= is_exported(name
, mod
);
2302 symnum
-= mod
->num_symtab
;
2308 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2312 for (i
= 0; i
< mod
->num_symtab
; i
++)
2313 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2314 mod
->symtab
[i
].st_info
!= 'U')
2315 return mod
->symtab
[i
].st_value
;
2319 /* Look for this name: can be of form module:name. */
2320 unsigned long module_kallsyms_lookup_name(const char *name
)
2324 unsigned long ret
= 0;
2326 /* Don't lock: we're in enough trouble already. */
2328 if ((colon
= strchr(name
, ':')) != NULL
) {
2330 if ((mod
= find_module(name
)) != NULL
)
2331 ret
= mod_find_symname(mod
, colon
+1);
2334 list_for_each_entry(mod
, &modules
, list
)
2335 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2341 #endif /* CONFIG_KALLSYMS */
2343 /* Called by the /proc file system to return a list of modules. */
2344 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2346 mutex_lock(&module_mutex
);
2347 return seq_list_start(&modules
, *pos
);
2350 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2352 return seq_list_next(p
, &modules
, pos
);
2355 static void m_stop(struct seq_file
*m
, void *p
)
2357 mutex_unlock(&module_mutex
);
2360 static char *taint_flags(unsigned int taints
, char *buf
)
2366 if (taints
& TAINT_PROPRIETARY_MODULE
)
2368 if (taints
& TAINT_FORCED_MODULE
)
2371 * TAINT_FORCED_RMMOD: could be added.
2372 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2382 static int m_show(struct seq_file
*m
, void *p
)
2384 struct module
*mod
= list_entry(p
, struct module
, list
);
2387 seq_printf(m
, "%s %lu",
2388 mod
->name
, mod
->init_size
+ mod
->core_size
);
2389 print_unload_info(m
, mod
);
2391 /* Informative for users. */
2392 seq_printf(m
, " %s",
2393 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2394 mod
->state
== MODULE_STATE_COMING
? "Loading":
2396 /* Used by oprofile and other similar tools. */
2397 seq_printf(m
, " 0x%p", mod
->module_core
);
2401 seq_printf(m
, " %s", taint_flags(mod
->taints
, buf
));
2403 seq_printf(m
, "\n");
2407 /* Format: modulename size refcount deps address
2409 Where refcount is a number or -, and deps is a comma-separated list
2412 const struct seq_operations modules_op
= {
2419 /* Given an address, look for it in the module exception tables. */
2420 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2422 const struct exception_table_entry
*e
= NULL
;
2426 list_for_each_entry(mod
, &modules
, list
) {
2427 if (mod
->num_exentries
== 0)
2430 e
= search_extable(mod
->extable
,
2431 mod
->extable
+ mod
->num_exentries
- 1,
2438 /* Now, if we found one, we are running inside it now, hence
2439 we cannot unload the module, hence no refcnt needed. */
2444 * Is this a valid module address?
2446 int is_module_address(unsigned long addr
)
2452 list_for_each_entry(mod
, &modules
, list
) {
2453 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2465 /* Is this a valid kernel address? */
2466 struct module
*__module_text_address(unsigned long addr
)
2470 list_for_each_entry(mod
, &modules
, list
)
2471 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2472 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2477 struct module
*module_text_address(unsigned long addr
)
2482 mod
= __module_text_address(addr
);
2488 /* Don't grab lock, we're oopsing. */
2489 void print_modules(void)
2494 printk("Modules linked in:");
2495 list_for_each_entry(mod
, &modules
, list
)
2496 printk(" %s%s", mod
->name
, taint_flags(mod
->taints
, buf
));
2500 #ifdef CONFIG_MODVERSIONS
2501 /* Generate the signature for struct module here, too, for modversions. */
2502 void struct_module(struct module
*mod
) { return; }
2503 EXPORT_SYMBOL(struct_module
);
2506 #ifdef CONFIG_MARKERS
2507 void module_update_markers(struct module
*probe_module
, int *refcount
)
2511 mutex_lock(&module_mutex
);
2512 list_for_each_entry(mod
, &modules
, list
)
2514 marker_update_probe_range(mod
->markers
,
2515 mod
->markers
+ mod
->num_markers
,
2516 probe_module
, refcount
);
2517 mutex_unlock(&module_mutex
);