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 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
501 #ifdef CONFIG_MODULE_UNLOAD
502 /* Init the unload section of the module. */
503 static void module_unload_init(struct module
*mod
)
507 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
508 for (i
= 0; i
< NR_CPUS
; i
++)
509 local_set(&mod
->ref
[i
].count
, 0);
510 /* Hold reference count during initialization. */
511 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
512 /* Backwards compatibility macros put refcount during init. */
513 mod
->waiter
= current
;
516 /* modules using other modules */
519 struct list_head list
;
520 struct module
*module_which_uses
;
523 /* Does a already use b? */
524 static int already_uses(struct module
*a
, struct module
*b
)
526 struct module_use
*use
;
528 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
529 if (use
->module_which_uses
== a
) {
530 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
534 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
538 /* Module a uses b */
539 static int use_module(struct module
*a
, struct module
*b
)
541 struct module_use
*use
;
544 if (b
== NULL
|| already_uses(a
, b
)) return 1;
546 if (!strong_try_module_get(b
))
549 DEBUGP("Allocating new usage for %s.\n", a
->name
);
550 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
552 printk("%s: out of memory loading\n", a
->name
);
557 use
->module_which_uses
= a
;
558 list_add(&use
->list
, &b
->modules_which_use_me
);
559 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
563 /* Clear the unload stuff of the module. */
564 static void module_unload_free(struct module
*mod
)
568 list_for_each_entry(i
, &modules
, list
) {
569 struct module_use
*use
;
571 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
572 if (use
->module_which_uses
== mod
) {
573 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
575 list_del(&use
->list
);
577 sysfs_remove_link(i
->holders_dir
, mod
->name
);
578 /* There can be at most one match. */
585 #ifdef CONFIG_MODULE_FORCE_UNLOAD
586 static inline int try_force_unload(unsigned int flags
)
588 int ret
= (flags
& O_TRUNC
);
590 add_taint(TAINT_FORCED_RMMOD
);
594 static inline int try_force_unload(unsigned int flags
)
598 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
607 /* Whole machine is stopped with interrupts off when this runs. */
608 static int __try_stop_module(void *_sref
)
610 struct stopref
*sref
= _sref
;
612 /* If it's not unused, quit unless we are told to block. */
613 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
614 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
618 /* Mark it as dying. */
619 sref
->mod
->state
= MODULE_STATE_GOING
;
623 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
625 struct stopref sref
= { mod
, flags
, forced
};
627 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
630 unsigned int module_refcount(struct module
*mod
)
632 unsigned int i
, total
= 0;
634 for (i
= 0; i
< NR_CPUS
; i
++)
635 total
+= local_read(&mod
->ref
[i
].count
);
638 EXPORT_SYMBOL(module_refcount
);
640 /* This exists whether we can unload or not */
641 static void free_module(struct module
*mod
);
643 static void wait_for_zero_refcount(struct module
*mod
)
645 /* Since we might sleep for some time, drop the semaphore first */
646 mutex_unlock(&module_mutex
);
648 DEBUGP("Looking at refcount...\n");
649 set_current_state(TASK_UNINTERRUPTIBLE
);
650 if (module_refcount(mod
) == 0)
654 current
->state
= TASK_RUNNING
;
655 mutex_lock(&module_mutex
);
659 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
662 char name
[MODULE_NAME_LEN
];
665 if (!capable(CAP_SYS_MODULE
))
668 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
670 name
[MODULE_NAME_LEN
-1] = '\0';
672 if (mutex_lock_interruptible(&module_mutex
) != 0)
675 mod
= find_module(name
);
681 if (!list_empty(&mod
->modules_which_use_me
)) {
682 /* Other modules depend on us: get rid of them first. */
687 /* Doing init or already dying? */
688 if (mod
->state
!= MODULE_STATE_LIVE
) {
689 /* FIXME: if (force), slam module count and wake up
691 DEBUGP("%s already dying\n", mod
->name
);
696 /* If it has an init func, it must have an exit func to unload */
697 if (mod
->init
&& !mod
->exit
) {
698 forced
= try_force_unload(flags
);
700 /* This module can't be removed */
706 /* Set this up before setting mod->state */
707 mod
->waiter
= current
;
709 /* Stop the machine so refcounts can't move and disable module. */
710 ret
= try_stop_module(mod
, flags
, &forced
);
714 /* Never wait if forced. */
715 if (!forced
&& module_refcount(mod
) != 0)
716 wait_for_zero_refcount(mod
);
718 /* Final destruction now noone is using it. */
719 if (mod
->exit
!= NULL
) {
720 mutex_unlock(&module_mutex
);
722 mutex_lock(&module_mutex
);
724 /* Store the name of the last unloaded module for diagnostic purposes */
725 sprintf(last_unloaded_module
, mod
->name
);
729 mutex_unlock(&module_mutex
);
733 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
735 struct module_use
*use
;
736 int printed_something
= 0;
738 seq_printf(m
, " %u ", module_refcount(mod
));
740 /* Always include a trailing , so userspace can differentiate
741 between this and the old multi-field proc format. */
742 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
743 printed_something
= 1;
744 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
747 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
748 printed_something
= 1;
749 seq_printf(m
, "[permanent],");
752 if (!printed_something
)
756 void __symbol_put(const char *symbol
)
758 struct module
*owner
;
759 const unsigned long *crc
;
762 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
767 EXPORT_SYMBOL(__symbol_put
);
769 void symbol_put_addr(void *addr
)
771 struct module
*modaddr
;
773 if (core_kernel_text((unsigned long)addr
))
776 if (!(modaddr
= module_text_address((unsigned long)addr
)))
780 EXPORT_SYMBOL_GPL(symbol_put_addr
);
782 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
783 struct module
*mod
, char *buffer
)
785 return sprintf(buffer
, "%u\n", module_refcount(mod
));
788 static struct module_attribute refcnt
= {
789 .attr
= { .name
= "refcnt", .mode
= 0444 },
793 void module_put(struct module
*module
)
796 unsigned int cpu
= get_cpu();
797 local_dec(&module
->ref
[cpu
].count
);
798 /* Maybe they're waiting for us to drop reference? */
799 if (unlikely(!module_is_live(module
)))
800 wake_up_process(module
->waiter
);
804 EXPORT_SYMBOL(module_put
);
806 #else /* !CONFIG_MODULE_UNLOAD */
807 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
809 /* We don't know the usage count, or what modules are using. */
810 seq_printf(m
, " - -");
813 static inline void module_unload_free(struct module
*mod
)
817 static inline int use_module(struct module
*a
, struct module
*b
)
819 return strong_try_module_get(b
);
822 static inline void module_unload_init(struct module
*mod
)
825 #endif /* CONFIG_MODULE_UNLOAD */
827 static ssize_t
show_initstate(struct module_attribute
*mattr
,
828 struct module
*mod
, char *buffer
)
830 const char *state
= "unknown";
832 switch (mod
->state
) {
833 case MODULE_STATE_LIVE
:
836 case MODULE_STATE_COMING
:
839 case MODULE_STATE_GOING
:
843 return sprintf(buffer
, "%s\n", state
);
846 static struct module_attribute initstate
= {
847 .attr
= { .name
= "initstate", .mode
= 0444 },
848 .show
= show_initstate
,
851 static struct module_attribute
*modinfo_attrs
[] = {
855 #ifdef CONFIG_MODULE_UNLOAD
861 static const char vermagic
[] = VERMAGIC_STRING
;
863 #ifdef CONFIG_MODVERSIONS
864 static int check_version(Elf_Shdr
*sechdrs
,
865 unsigned int versindex
,
868 const unsigned long *crc
)
870 unsigned int i
, num_versions
;
871 struct modversion_info
*versions
;
873 /* Exporting module didn't supply crcs? OK, we're already tainted. */
877 versions
= (void *) sechdrs
[versindex
].sh_addr
;
878 num_versions
= sechdrs
[versindex
].sh_size
879 / sizeof(struct modversion_info
);
881 for (i
= 0; i
< num_versions
; i
++) {
882 if (strcmp(versions
[i
].name
, symname
) != 0)
885 if (versions
[i
].crc
== *crc
)
887 printk("%s: disagrees about version of symbol %s\n",
889 DEBUGP("Found checksum %lX vs module %lX\n",
890 *crc
, versions
[i
].crc
);
893 /* Not in module's version table. OK, but that taints the kernel. */
894 if (!(tainted
& TAINT_FORCED_MODULE
))
895 printk("%s: no version for \"%s\" found: kernel tainted.\n",
897 add_taint_module(mod
, TAINT_FORCED_MODULE
);
901 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
902 unsigned int versindex
,
905 const unsigned long *crc
;
906 struct module
*owner
;
908 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
910 return check_version(sechdrs
, versindex
, "struct_module", mod
,
914 /* First part is kernel version, which we ignore. */
915 static inline int same_magic(const char *amagic
, const char *bmagic
)
917 amagic
+= strcspn(amagic
, " ");
918 bmagic
+= strcspn(bmagic
, " ");
919 return strcmp(amagic
, bmagic
) == 0;
922 static inline int check_version(Elf_Shdr
*sechdrs
,
923 unsigned int versindex
,
926 const unsigned long *crc
)
931 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
932 unsigned int versindex
,
938 static inline int same_magic(const char *amagic
, const char *bmagic
)
940 return strcmp(amagic
, bmagic
) == 0;
942 #endif /* CONFIG_MODVERSIONS */
944 /* Resolve a symbol for this module. I.e. if we find one, record usage.
945 Must be holding module_mutex. */
946 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
947 unsigned int versindex
,
951 struct module
*owner
;
953 const unsigned long *crc
;
955 ret
= __find_symbol(name
, &owner
, &crc
,
956 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
));
958 /* use_module can fail due to OOM,
959 or module initialization or unloading */
960 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
961 !use_module(mod
, owner
))
969 * /sys/module/foo/sections stuff
970 * J. Corbet <corbet@lwn.net>
972 #ifdef CONFIG_KALLSYMS
973 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
974 struct module
*mod
, char *buf
)
976 struct module_sect_attr
*sattr
=
977 container_of(mattr
, struct module_sect_attr
, mattr
);
978 return sprintf(buf
, "0x%lx\n", sattr
->address
);
981 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
985 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
986 kfree(sect_attrs
->attrs
[section
].name
);
990 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
991 char *secstrings
, Elf_Shdr
*sechdrs
)
993 unsigned int nloaded
= 0, i
, size
[2];
994 struct module_sect_attrs
*sect_attrs
;
995 struct module_sect_attr
*sattr
;
996 struct attribute
**gattr
;
998 /* Count loaded sections and allocate structures */
999 for (i
= 0; i
< nsect
; i
++)
1000 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1002 size
[0] = ALIGN(sizeof(*sect_attrs
)
1003 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1004 sizeof(sect_attrs
->grp
.attrs
[0]));
1005 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1006 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1007 if (sect_attrs
== NULL
)
1010 /* Setup section attributes. */
1011 sect_attrs
->grp
.name
= "sections";
1012 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1014 sect_attrs
->nsections
= 0;
1015 sattr
= §_attrs
->attrs
[0];
1016 gattr
= §_attrs
->grp
.attrs
[0];
1017 for (i
= 0; i
< nsect
; i
++) {
1018 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1020 sattr
->address
= sechdrs
[i
].sh_addr
;
1021 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1023 if (sattr
->name
== NULL
)
1025 sect_attrs
->nsections
++;
1026 sattr
->mattr
.show
= module_sect_show
;
1027 sattr
->mattr
.store
= NULL
;
1028 sattr
->mattr
.attr
.name
= sattr
->name
;
1029 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1030 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1034 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1037 mod
->sect_attrs
= sect_attrs
;
1040 free_sect_attrs(sect_attrs
);
1043 static void remove_sect_attrs(struct module
*mod
)
1045 if (mod
->sect_attrs
) {
1046 sysfs_remove_group(&mod
->mkobj
.kobj
,
1047 &mod
->sect_attrs
->grp
);
1048 /* We are positive that no one is using any sect attrs
1049 * at this point. Deallocate immediately. */
1050 free_sect_attrs(mod
->sect_attrs
);
1051 mod
->sect_attrs
= NULL
;
1056 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1059 struct module_notes_attrs
{
1060 struct kobject
*dir
;
1062 struct bin_attribute attrs
[0];
1065 static ssize_t
module_notes_read(struct kobject
*kobj
,
1066 struct bin_attribute
*bin_attr
,
1067 char *buf
, loff_t pos
, size_t count
)
1070 * The caller checked the pos and count against our size.
1072 memcpy(buf
, bin_attr
->private + pos
, count
);
1076 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1079 if (notes_attrs
->dir
) {
1081 sysfs_remove_bin_file(notes_attrs
->dir
,
1082 ¬es_attrs
->attrs
[i
]);
1083 kobject_del(notes_attrs
->dir
);
1088 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1089 char *secstrings
, Elf_Shdr
*sechdrs
)
1091 unsigned int notes
, loaded
, i
;
1092 struct module_notes_attrs
*notes_attrs
;
1093 struct bin_attribute
*nattr
;
1095 /* Count notes sections and allocate structures. */
1097 for (i
= 0; i
< nsect
; i
++)
1098 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1099 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1105 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1106 + notes
* sizeof(notes_attrs
->attrs
[0]),
1108 if (notes_attrs
== NULL
)
1111 notes_attrs
->notes
= notes
;
1112 nattr
= ¬es_attrs
->attrs
[0];
1113 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1114 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1116 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1117 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1118 nattr
->attr
.mode
= S_IRUGO
;
1119 nattr
->size
= sechdrs
[i
].sh_size
;
1120 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1121 nattr
->read
= module_notes_read
;
1127 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1128 if (!notes_attrs
->dir
)
1131 for (i
= 0; i
< notes
; ++i
)
1132 if (sysfs_create_bin_file(notes_attrs
->dir
,
1133 ¬es_attrs
->attrs
[i
]))
1136 mod
->notes_attrs
= notes_attrs
;
1140 free_notes_attrs(notes_attrs
, i
);
1143 static void remove_notes_attrs(struct module
*mod
)
1145 if (mod
->notes_attrs
)
1146 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1151 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1152 char *sectstrings
, Elf_Shdr
*sechdrs
)
1156 static inline void remove_sect_attrs(struct module
*mod
)
1160 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1161 char *sectstrings
, Elf_Shdr
*sechdrs
)
1165 static inline void remove_notes_attrs(struct module
*mod
)
1168 #endif /* CONFIG_KALLSYMS */
1171 int module_add_modinfo_attrs(struct module
*mod
)
1173 struct module_attribute
*attr
;
1174 struct module_attribute
*temp_attr
;
1178 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1179 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1181 if (!mod
->modinfo_attrs
)
1184 temp_attr
= mod
->modinfo_attrs
;
1185 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1187 (attr
->test
&& attr
->test(mod
))) {
1188 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1189 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1196 void module_remove_modinfo_attrs(struct module
*mod
)
1198 struct module_attribute
*attr
;
1201 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1202 /* pick a field to test for end of list */
1203 if (!attr
->attr
.name
)
1205 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1209 kfree(mod
->modinfo_attrs
);
1214 int mod_sysfs_init(struct module
*mod
)
1217 struct kobject
*kobj
;
1219 if (!module_sysfs_initialized
) {
1220 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1226 kobj
= kset_find_obj(module_kset
, mod
->name
);
1228 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1234 mod
->mkobj
.mod
= mod
;
1236 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1237 mod
->mkobj
.kobj
.kset
= module_kset
;
1238 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1241 kobject_put(&mod
->mkobj
.kobj
);
1243 /* delay uevent until full sysfs population */
1248 int mod_sysfs_setup(struct module
*mod
,
1249 struct kernel_param
*kparam
,
1250 unsigned int num_params
)
1254 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1255 if (!mod
->holders_dir
) {
1260 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1262 goto out_unreg_holders
;
1264 err
= module_add_modinfo_attrs(mod
);
1266 goto out_unreg_param
;
1268 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1272 module_param_sysfs_remove(mod
);
1274 kobject_put(mod
->holders_dir
);
1276 kobject_put(&mod
->mkobj
.kobj
);
1281 static void mod_kobject_remove(struct module
*mod
)
1283 module_remove_modinfo_attrs(mod
);
1284 module_param_sysfs_remove(mod
);
1285 kobject_put(mod
->mkobj
.drivers_dir
);
1286 kobject_put(mod
->holders_dir
);
1287 kobject_put(&mod
->mkobj
.kobj
);
1291 * unlink the module with the whole machine is stopped with interrupts off
1292 * - this defends against kallsyms not taking locks
1294 static int __unlink_module(void *_mod
)
1296 struct module
*mod
= _mod
;
1297 list_del(&mod
->list
);
1301 /* Free a module, remove from lists, etc (must hold module_mutex). */
1302 static void free_module(struct module
*mod
)
1304 /* Delete from various lists */
1305 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1306 remove_notes_attrs(mod
);
1307 remove_sect_attrs(mod
);
1308 mod_kobject_remove(mod
);
1310 unwind_remove_table(mod
->unwind_info
, 0);
1312 /* Arch-specific cleanup. */
1313 module_arch_cleanup(mod
);
1315 /* Module unload stuff */
1316 module_unload_free(mod
);
1318 /* This may be NULL, but that's OK */
1319 module_free(mod
, mod
->module_init
);
1322 percpu_modfree(mod
->percpu
);
1324 /* Free lock-classes: */
1325 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1327 /* Finally, free the core (containing the module structure) */
1328 module_free(mod
, mod
->module_core
);
1331 void *__symbol_get(const char *symbol
)
1333 struct module
*owner
;
1334 unsigned long value
;
1335 const unsigned long *crc
;
1338 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1339 if (value
&& !strong_try_module_get(owner
))
1343 return (void *)value
;
1345 EXPORT_SYMBOL_GPL(__symbol_get
);
1348 * Ensure that an exported symbol [global namespace] does not already exist
1349 * in the kernel or in some other module's exported symbol table.
1351 static int verify_export_symbols(struct module
*mod
)
1353 const char *name
= NULL
;
1354 unsigned long i
, ret
= 0;
1355 struct module
*owner
;
1356 const unsigned long *crc
;
1358 for (i
= 0; i
< mod
->num_syms
; i
++)
1359 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1360 name
= mod
->syms
[i
].name
;
1365 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1366 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1367 name
= mod
->gpl_syms
[i
].name
;
1374 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1375 mod
->name
, name
, module_name(owner
));
1380 /* Change all symbols so that st_value encodes the pointer directly. */
1381 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1382 unsigned int symindex
,
1384 unsigned int versindex
,
1385 unsigned int pcpuindex
,
1388 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1389 unsigned long secbase
;
1390 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1393 for (i
= 1; i
< n
; i
++) {
1394 switch (sym
[i
].st_shndx
) {
1396 /* We compiled with -fno-common. These are not
1397 supposed to happen. */
1398 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1399 printk("%s: please compile with -fno-common\n",
1405 /* Don't need to do anything */
1406 DEBUGP("Absolute symbol: 0x%08lx\n",
1407 (long)sym
[i
].st_value
);
1412 = resolve_symbol(sechdrs
, versindex
,
1413 strtab
+ sym
[i
].st_name
, mod
);
1415 /* Ok if resolved. */
1416 if (sym
[i
].st_value
!= 0)
1419 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1422 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1423 mod
->name
, strtab
+ sym
[i
].st_name
);
1428 /* Divert to percpu allocation if a percpu var. */
1429 if (sym
[i
].st_shndx
== pcpuindex
)
1430 secbase
= (unsigned long)mod
->percpu
;
1432 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1433 sym
[i
].st_value
+= secbase
;
1441 /* Update size with this section: return offset. */
1442 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1446 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1447 *size
= ret
+ sechdr
->sh_size
;
1451 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1452 might -- code, read-only data, read-write data, small data. Tally
1453 sizes, and place the offsets into sh_entsize fields: high bit means it
1455 static void layout_sections(struct module
*mod
,
1456 const Elf_Ehdr
*hdr
,
1458 const char *secstrings
)
1460 static unsigned long const masks
[][2] = {
1461 /* NOTE: all executable code must be the first section
1462 * in this array; otherwise modify the text_size
1463 * finder in the two loops below */
1464 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1465 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1466 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1467 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1471 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1472 sechdrs
[i
].sh_entsize
= ~0UL;
1474 DEBUGP("Core section allocation order:\n");
1475 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1476 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1477 Elf_Shdr
*s
= &sechdrs
[i
];
1479 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1480 || (s
->sh_flags
& masks
[m
][1])
1481 || s
->sh_entsize
!= ~0UL
1482 || strncmp(secstrings
+ s
->sh_name
,
1485 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1486 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1489 mod
->core_text_size
= mod
->core_size
;
1492 DEBUGP("Init section allocation order:\n");
1493 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1494 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1495 Elf_Shdr
*s
= &sechdrs
[i
];
1497 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1498 || (s
->sh_flags
& masks
[m
][1])
1499 || s
->sh_entsize
!= ~0UL
1500 || strncmp(secstrings
+ s
->sh_name
,
1503 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1504 | INIT_OFFSET_MASK
);
1505 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1508 mod
->init_text_size
= mod
->init_size
;
1512 static void set_license(struct module
*mod
, const char *license
)
1515 license
= "unspecified";
1517 if (!license_is_gpl_compatible(license
)) {
1518 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1519 printk(KERN_WARNING
"%s: module license '%s' taints "
1520 "kernel.\n", mod
->name
, license
);
1521 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1525 /* Parse tag=value strings from .modinfo section */
1526 static char *next_string(char *string
, unsigned long *secsize
)
1528 /* Skip non-zero chars */
1531 if ((*secsize
)-- <= 1)
1535 /* Skip any zero padding. */
1536 while (!string
[0]) {
1538 if ((*secsize
)-- <= 1)
1544 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1549 unsigned int taglen
= strlen(tag
);
1550 unsigned long size
= sechdrs
[info
].sh_size
;
1552 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1553 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1554 return p
+ taglen
+ 1;
1559 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1560 unsigned int infoindex
)
1562 struct module_attribute
*attr
;
1565 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1568 get_modinfo(sechdrs
,
1574 #ifdef CONFIG_KALLSYMS
1575 static int is_exported(const char *name
, const struct module
*mod
)
1577 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1580 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1587 static char elf_type(const Elf_Sym
*sym
,
1589 const char *secstrings
,
1592 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1593 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1598 if (sym
->st_shndx
== SHN_UNDEF
)
1600 if (sym
->st_shndx
== SHN_ABS
)
1602 if (sym
->st_shndx
>= SHN_LORESERVE
)
1604 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1606 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1607 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1608 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1610 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1615 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1616 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1621 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1622 ".debug", strlen(".debug")) == 0)
1627 static void add_kallsyms(struct module
*mod
,
1629 unsigned int symindex
,
1630 unsigned int strindex
,
1631 const char *secstrings
)
1635 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1636 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1637 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1639 /* Set types up while we still have access to sections. */
1640 for (i
= 0; i
< mod
->num_symtab
; i
++)
1641 mod
->symtab
[i
].st_info
1642 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1645 static inline void add_kallsyms(struct module
*mod
,
1647 unsigned int symindex
,
1648 unsigned int strindex
,
1649 const char *secstrings
)
1652 #endif /* CONFIG_KALLSYMS */
1654 /* Allocate and load the module: note that size of section 0 is always
1655 zero, and we rely on this for optional sections. */
1656 static struct module
*load_module(void __user
*umod
,
1658 const char __user
*uargs
)
1662 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1664 unsigned int symindex
= 0;
1665 unsigned int strindex
= 0;
1666 unsigned int setupindex
;
1667 unsigned int exindex
;
1668 unsigned int exportindex
;
1669 unsigned int modindex
;
1670 unsigned int obsparmindex
;
1671 unsigned int infoindex
;
1672 unsigned int gplindex
;
1673 unsigned int crcindex
;
1674 unsigned int gplcrcindex
;
1675 unsigned int versindex
;
1676 unsigned int pcpuindex
;
1677 unsigned int gplfutureindex
;
1678 unsigned int gplfuturecrcindex
;
1679 unsigned int unwindex
= 0;
1680 unsigned int unusedindex
;
1681 unsigned int unusedcrcindex
;
1682 unsigned int unusedgplindex
;
1683 unsigned int unusedgplcrcindex
;
1684 unsigned int markersindex
;
1685 unsigned int markersstringsindex
;
1688 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1689 struct exception_table_entry
*extable
;
1690 mm_segment_t old_fs
;
1692 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1694 if (len
< sizeof(*hdr
))
1695 return ERR_PTR(-ENOEXEC
);
1697 /* Suck in entire file: we'll want most of it. */
1698 /* vmalloc barfs on "unusual" numbers. Check here */
1699 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1700 return ERR_PTR(-ENOMEM
);
1701 if (copy_from_user(hdr
, umod
, len
) != 0) {
1706 /* Sanity checks against insmoding binaries or wrong arch,
1707 weird elf version */
1708 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1709 || hdr
->e_type
!= ET_REL
1710 || !elf_check_arch(hdr
)
1711 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1716 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1719 /* Convenience variables */
1720 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1721 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1722 sechdrs
[0].sh_addr
= 0;
1724 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1725 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1726 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1729 /* Mark all sections sh_addr with their address in the
1731 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1733 /* Internal symbols and strings. */
1734 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1736 strindex
= sechdrs
[i
].sh_link
;
1737 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1739 #ifndef CONFIG_MODULE_UNLOAD
1740 /* Don't load .exit sections */
1741 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1742 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1746 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1747 ".gnu.linkonce.this_module");
1749 printk(KERN_WARNING
"No module found in object\n");
1753 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1755 if (symindex
== 0) {
1756 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1762 /* Optional sections */
1763 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1764 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1765 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1766 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1767 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1768 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1769 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1770 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1771 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1772 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1773 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1774 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1775 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1776 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1777 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1778 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1779 #ifdef ARCH_UNWIND_SECTION_NAME
1780 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1783 /* Don't keep modinfo section */
1784 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1785 #ifdef CONFIG_KALLSYMS
1786 /* Keep symbol and string tables for decoding later. */
1787 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1788 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1791 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1793 /* Check module struct version now, before we try to use module. */
1794 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1799 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1800 /* This is allowed: modprobe --force will invalidate it. */
1802 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1803 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1805 } else if (!same_magic(modmagic
, vermagic
)) {
1806 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1807 mod
->name
, modmagic
, vermagic
);
1812 /* Now copy in args */
1813 args
= strndup_user(uargs
, ~0UL >> 1);
1815 err
= PTR_ERR(args
);
1819 if (find_module(mod
->name
)) {
1824 mod
->state
= MODULE_STATE_COMING
;
1826 /* Allow arches to frob section contents and sizes. */
1827 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1832 /* We have a special allocation for this section. */
1833 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1834 sechdrs
[pcpuindex
].sh_addralign
,
1840 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1841 mod
->percpu
= percpu
;
1844 /* Determine total sizes, and put offsets in sh_entsize. For now
1845 this is done generically; there doesn't appear to be any
1846 special cases for the architectures. */
1847 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1849 /* Do the allocs. */
1850 ptr
= module_alloc(mod
->core_size
);
1855 memset(ptr
, 0, mod
->core_size
);
1856 mod
->module_core
= ptr
;
1858 ptr
= module_alloc(mod
->init_size
);
1859 if (!ptr
&& mod
->init_size
) {
1863 memset(ptr
, 0, mod
->init_size
);
1864 mod
->module_init
= ptr
;
1866 /* Transfer each section which specifies SHF_ALLOC */
1867 DEBUGP("final section addresses:\n");
1868 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1871 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1874 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1875 dest
= mod
->module_init
1876 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1878 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1880 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1881 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1882 sechdrs
[i
].sh_size
);
1883 /* Update sh_addr to point to copy in image. */
1884 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1885 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1887 /* Module has been moved. */
1888 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1890 /* Now we've moved module, initialize linked lists, etc. */
1891 module_unload_init(mod
);
1893 /* add kobject, so we can reference it. */
1894 err
= mod_sysfs_init(mod
);
1898 /* Set up license info based on the info section */
1899 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1901 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1902 add_taint(TAINT_PROPRIETARY_MODULE
);
1903 if (strcmp(mod
->name
, "driverloader") == 0)
1904 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1906 /* Set up MODINFO_ATTR fields */
1907 setup_modinfo(mod
, sechdrs
, infoindex
);
1909 /* Fix up syms, so that st_value is a pointer to location. */
1910 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1915 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1916 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1917 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1919 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1920 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1921 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1923 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1924 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1925 sizeof(*mod
->gpl_future_syms
);
1926 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1927 sizeof(*mod
->unused_syms
);
1928 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1929 sizeof(*mod
->unused_gpl_syms
);
1930 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1931 if (gplfuturecrcindex
)
1932 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1934 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1936 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1937 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1938 if (unusedgplcrcindex
)
1939 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1941 #ifdef CONFIG_MODVERSIONS
1942 if ((mod
->num_syms
&& !crcindex
) ||
1943 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1944 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1945 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1946 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1947 printk(KERN_WARNING
"%s: No versions for exported symbols."
1948 " Tainting kernel.\n", mod
->name
);
1949 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1952 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
1953 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
1954 "__markers_strings");
1956 /* Now do relocations. */
1957 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1958 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1959 unsigned int info
= sechdrs
[i
].sh_info
;
1961 /* Not a valid relocation section? */
1962 if (info
>= hdr
->e_shnum
)
1965 /* Don't bother with non-allocated sections */
1966 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1969 if (sechdrs
[i
].sh_type
== SHT_REL
)
1970 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1971 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1972 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1977 #ifdef CONFIG_MARKERS
1978 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
1980 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
1983 /* Find duplicate symbols */
1984 err
= verify_export_symbols(mod
);
1989 /* Set up and sort exception table */
1990 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1991 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1992 sort_extable(extable
, extable
+ mod
->num_exentries
);
1994 /* Finally, copy percpu area over. */
1995 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1996 sechdrs
[pcpuindex
].sh_size
);
1998 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2000 #ifdef CONFIG_MARKERS
2002 marker_update_probe_range(mod
->markers
,
2003 mod
->markers
+ mod
->num_markers
, NULL
, NULL
);
2005 err
= module_finalize(hdr
, sechdrs
, mod
);
2009 /* flush the icache in correct context */
2014 * Flush the instruction cache, since we've played with text.
2015 * Do it before processing of module parameters, so the module
2016 * can provide parameter accessor functions of its own.
2018 if (mod
->module_init
)
2019 flush_icache_range((unsigned long)mod
->module_init
,
2020 (unsigned long)mod
->module_init
2022 flush_icache_range((unsigned long)mod
->module_core
,
2023 (unsigned long)mod
->module_core
+ mod
->core_size
);
2029 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2032 /* Size of section 0 is 0, so this works well if no params */
2033 err
= parse_args(mod
->name
, mod
->args
,
2034 (struct kernel_param
*)
2035 sechdrs
[setupindex
].sh_addr
,
2036 sechdrs
[setupindex
].sh_size
2037 / sizeof(struct kernel_param
),
2042 err
= mod_sysfs_setup(mod
,
2043 (struct kernel_param
*)
2044 sechdrs
[setupindex
].sh_addr
,
2045 sechdrs
[setupindex
].sh_size
2046 / sizeof(struct kernel_param
));
2049 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2050 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2052 /* Size of section 0 is 0, so this works well if no unwind info. */
2053 mod
->unwind_info
= unwind_add_table(mod
,
2054 (void *)sechdrs
[unwindex
].sh_addr
,
2055 sechdrs
[unwindex
].sh_size
);
2057 /* Get rid of temporary copy */
2064 module_arch_cleanup(mod
);
2066 kobject_del(&mod
->mkobj
.kobj
);
2067 kobject_put(&mod
->mkobj
.kobj
);
2069 module_unload_free(mod
);
2070 module_free(mod
, mod
->module_init
);
2072 module_free(mod
, mod
->module_core
);
2075 percpu_modfree(percpu
);
2080 return ERR_PTR(err
);
2083 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2089 * link the module with the whole machine is stopped with interrupts off
2090 * - this defends against kallsyms not taking locks
2092 static int __link_module(void *_mod
)
2094 struct module
*mod
= _mod
;
2095 list_add(&mod
->list
, &modules
);
2099 /* This is where the real work happens */
2101 sys_init_module(void __user
*umod
,
2103 const char __user
*uargs
)
2108 /* Must have permission */
2109 if (!capable(CAP_SYS_MODULE
))
2112 /* Only one module load at a time, please */
2113 if (mutex_lock_interruptible(&module_mutex
) != 0)
2116 /* Do all the hard work */
2117 mod
= load_module(umod
, len
, uargs
);
2119 mutex_unlock(&module_mutex
);
2120 return PTR_ERR(mod
);
2123 /* Now sew it into the lists. They won't access us, since
2124 strong_try_module_get() will fail. */
2125 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2127 /* Drop lock so they can recurse */
2128 mutex_unlock(&module_mutex
);
2130 blocking_notifier_call_chain(&module_notify_list
,
2131 MODULE_STATE_COMING
, mod
);
2133 /* Start the module */
2134 if (mod
->init
!= NULL
)
2137 /* Init routine failed: abort. Try to protect us from
2138 buggy refcounters. */
2139 mod
->state
= MODULE_STATE_GOING
;
2140 synchronize_sched();
2142 mutex_lock(&module_mutex
);
2144 mutex_unlock(&module_mutex
);
2148 /* Now it's a first class citizen! */
2149 mutex_lock(&module_mutex
);
2150 mod
->state
= MODULE_STATE_LIVE
;
2151 /* Drop initial reference. */
2153 unwind_remove_table(mod
->unwind_info
, 1);
2154 module_free(mod
, mod
->module_init
);
2155 mod
->module_init
= NULL
;
2157 mod
->init_text_size
= 0;
2158 mutex_unlock(&module_mutex
);
2163 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2165 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2168 #ifdef CONFIG_KALLSYMS
2170 * This ignores the intensely annoying "mapping symbols" found
2171 * in ARM ELF files: $a, $t and $d.
2173 static inline int is_arm_mapping_symbol(const char *str
)
2175 return str
[0] == '$' && strchr("atd", str
[1])
2176 && (str
[2] == '\0' || str
[2] == '.');
2179 static const char *get_ksymbol(struct module
*mod
,
2181 unsigned long *size
,
2182 unsigned long *offset
)
2184 unsigned int i
, best
= 0;
2185 unsigned long nextval
;
2187 /* At worse, next value is at end of module */
2188 if (within(addr
, mod
->module_init
, mod
->init_size
))
2189 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2191 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2193 /* Scan for closest preceeding symbol, and next symbol. (ELF
2194 starts real symbols at 1). */
2195 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2196 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2199 /* We ignore unnamed symbols: they're uninformative
2200 * and inserted at a whim. */
2201 if (mod
->symtab
[i
].st_value
<= addr
2202 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2203 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2204 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2206 if (mod
->symtab
[i
].st_value
> addr
2207 && mod
->symtab
[i
].st_value
< nextval
2208 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2209 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2210 nextval
= mod
->symtab
[i
].st_value
;
2217 *size
= nextval
- mod
->symtab
[best
].st_value
;
2219 *offset
= addr
- mod
->symtab
[best
].st_value
;
2220 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2223 /* For kallsyms to ask for address resolution. NULL means not found.
2224 We don't lock, as this is used for oops resolution and races are a
2226 /* FIXME: Risky: returns a pointer into a module w/o lock */
2227 const char *module_address_lookup(unsigned long addr
,
2228 unsigned long *size
,
2229 unsigned long *offset
,
2233 const char *ret
= NULL
;
2236 list_for_each_entry(mod
, &modules
, list
) {
2237 if (within(addr
, mod
->module_init
, mod
->init_size
)
2238 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2240 *modname
= mod
->name
;
2241 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2249 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2254 list_for_each_entry(mod
, &modules
, list
) {
2255 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2256 within(addr
, mod
->module_core
, mod
->core_size
)) {
2259 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2262 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2272 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2273 unsigned long *offset
, char *modname
, char *name
)
2278 list_for_each_entry(mod
, &modules
, list
) {
2279 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2280 within(addr
, mod
->module_core
, mod
->core_size
)) {
2283 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2287 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2289 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2299 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2300 char *name
, char *module_name
, int *exported
)
2305 list_for_each_entry(mod
, &modules
, list
) {
2306 if (symnum
< mod
->num_symtab
) {
2307 *value
= mod
->symtab
[symnum
].st_value
;
2308 *type
= mod
->symtab
[symnum
].st_info
;
2309 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2311 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2312 *exported
= is_exported(name
, mod
);
2316 symnum
-= mod
->num_symtab
;
2322 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2326 for (i
= 0; i
< mod
->num_symtab
; i
++)
2327 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2328 mod
->symtab
[i
].st_info
!= 'U')
2329 return mod
->symtab
[i
].st_value
;
2333 /* Look for this name: can be of form module:name. */
2334 unsigned long module_kallsyms_lookup_name(const char *name
)
2338 unsigned long ret
= 0;
2340 /* Don't lock: we're in enough trouble already. */
2342 if ((colon
= strchr(name
, ':')) != NULL
) {
2344 if ((mod
= find_module(name
)) != NULL
)
2345 ret
= mod_find_symname(mod
, colon
+1);
2348 list_for_each_entry(mod
, &modules
, list
)
2349 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2355 #endif /* CONFIG_KALLSYMS */
2357 /* Called by the /proc file system to return a list of modules. */
2358 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2360 mutex_lock(&module_mutex
);
2361 return seq_list_start(&modules
, *pos
);
2364 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2366 return seq_list_next(p
, &modules
, pos
);
2369 static void m_stop(struct seq_file
*m
, void *p
)
2371 mutex_unlock(&module_mutex
);
2374 static char *module_flags(struct module
*mod
, char *buf
)
2379 mod
->state
== MODULE_STATE_GOING
||
2380 mod
->state
== MODULE_STATE_COMING
) {
2382 if (mod
->taints
& TAINT_PROPRIETARY_MODULE
)
2384 if (mod
->taints
& TAINT_FORCED_MODULE
)
2387 * TAINT_FORCED_RMMOD: could be added.
2388 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2392 /* Show a - for module-is-being-unloaded */
2393 if (mod
->state
== MODULE_STATE_GOING
)
2395 /* Show a + for module-is-being-loaded */
2396 if (mod
->state
== MODULE_STATE_COMING
)
2405 static int m_show(struct seq_file
*m
, void *p
)
2407 struct module
*mod
= list_entry(p
, struct module
, list
);
2410 seq_printf(m
, "%s %lu",
2411 mod
->name
, mod
->init_size
+ mod
->core_size
);
2412 print_unload_info(m
, mod
);
2414 /* Informative for users. */
2415 seq_printf(m
, " %s",
2416 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2417 mod
->state
== MODULE_STATE_COMING
? "Loading":
2419 /* Used by oprofile and other similar tools. */
2420 seq_printf(m
, " 0x%p", mod
->module_core
);
2424 seq_printf(m
, " %s", module_flags(mod
, buf
));
2426 seq_printf(m
, "\n");
2430 /* Format: modulename size refcount deps address
2432 Where refcount is a number or -, and deps is a comma-separated list
2435 const struct seq_operations modules_op
= {
2442 /* Given an address, look for it in the module exception tables. */
2443 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2445 const struct exception_table_entry
*e
= NULL
;
2449 list_for_each_entry(mod
, &modules
, list
) {
2450 if (mod
->num_exentries
== 0)
2453 e
= search_extable(mod
->extable
,
2454 mod
->extable
+ mod
->num_exentries
- 1,
2461 /* Now, if we found one, we are running inside it now, hence
2462 we cannot unload the module, hence no refcnt needed. */
2467 * Is this a valid module address?
2469 int is_module_address(unsigned long addr
)
2475 list_for_each_entry(mod
, &modules
, list
) {
2476 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2488 /* Is this a valid kernel address? */
2489 struct module
*__module_text_address(unsigned long addr
)
2493 list_for_each_entry(mod
, &modules
, list
)
2494 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2495 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2500 struct module
*module_text_address(unsigned long addr
)
2505 mod
= __module_text_address(addr
);
2511 /* Don't grab lock, we're oopsing. */
2512 void print_modules(void)
2517 printk("Modules linked in:");
2518 list_for_each_entry(mod
, &modules
, list
)
2519 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2520 if (last_unloaded_module
[0])
2521 printk(" [last unloaded: %s]", last_unloaded_module
);
2525 #ifdef CONFIG_MODVERSIONS
2526 /* Generate the signature for struct module here, too, for modversions. */
2527 void struct_module(struct module
*mod
) { return; }
2528 EXPORT_SYMBOL(struct_module
);
2531 #ifdef CONFIG_MARKERS
2532 void module_update_markers(struct module
*probe_module
, int *refcount
)
2536 mutex_lock(&module_mutex
);
2537 list_for_each_entry(mod
, &modules
, list
)
2539 marker_update_probe_range(mod
->markers
,
2540 mod
->markers
+ mod
->num_markers
,
2541 probe_module
, refcount
);
2542 mutex_unlock(&module_mutex
);