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>
24 #include <linux/sysfs.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/elf.h>
29 #include <linux/proc_fs.h>
30 #include <linux/seq_file.h>
31 #include <linux/syscalls.h>
32 #include <linux/fcntl.h>
33 #include <linux/rcupdate.h>
34 #include <linux/capability.h>
35 #include <linux/cpu.h>
36 #include <linux/moduleparam.h>
37 #include <linux/errno.h>
38 #include <linux/err.h>
39 #include <linux/vermagic.h>
40 #include <linux/notifier.h>
41 #include <linux/sched.h>
42 #include <linux/stop_machine.h>
43 #include <linux/device.h>
44 #include <linux/string.h>
45 #include <linux/mutex.h>
46 #include <linux/rculist.h>
47 #include <asm/uaccess.h>
48 #include <asm/cacheflush.h>
49 #include <linux/license.h>
50 #include <asm/sections.h>
51 #include <linux/tracepoint.h>
52 #include <linux/ftrace.h>
53 #include <linux/async.h>
58 #define DEBUGP(fmt , a...)
61 #ifndef ARCH_SHF_SMALL
62 #define ARCH_SHF_SMALL 0
65 /* If this is set, the section belongs in the init part of the module */
66 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
68 /* List of modules, protected by module_mutex or preempt_disable
69 * (delete uses stop_machine/add uses RCU list operations). */
70 static DEFINE_MUTEX(module_mutex
);
71 static LIST_HEAD(modules
);
73 /* Waiting for a module to finish initializing? */
74 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
76 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
78 /* Bounds of module allocation, for speeding __module_text_address */
79 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
81 int register_module_notifier(struct notifier_block
* nb
)
83 return blocking_notifier_chain_register(&module_notify_list
, nb
);
85 EXPORT_SYMBOL(register_module_notifier
);
87 int unregister_module_notifier(struct notifier_block
* nb
)
89 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
91 EXPORT_SYMBOL(unregister_module_notifier
);
93 /* We require a truly strong try_module_get(): 0 means failure due to
94 ongoing or failed initialization etc. */
95 static inline int strong_try_module_get(struct module
*mod
)
97 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
99 if (try_module_get(mod
))
105 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
108 mod
->taints
|= (1U << flag
);
112 * A thread that wants to hold a reference to a module only while it
113 * is running can call this to safely exit. nfsd and lockd use this.
115 void __module_put_and_exit(struct module
*mod
, long code
)
120 EXPORT_SYMBOL(__module_put_and_exit
);
122 /* Find a module section: 0 means not found. */
123 static unsigned int find_sec(Elf_Ehdr
*hdr
,
125 const char *secstrings
,
130 for (i
= 1; i
< hdr
->e_shnum
; i
++)
131 /* Alloc bit cleared means "ignore it." */
132 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
133 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
138 /* Find a module section, or NULL. */
139 static void *section_addr(Elf_Ehdr
*hdr
, Elf_Shdr
*shdrs
,
140 const char *secstrings
, const char *name
)
142 /* Section 0 has sh_addr 0. */
143 return (void *)shdrs
[find_sec(hdr
, shdrs
, secstrings
, name
)].sh_addr
;
146 /* Find a module section, or NULL. Fill in number of "objects" in section. */
147 static void *section_objs(Elf_Ehdr
*hdr
,
149 const char *secstrings
,
154 unsigned int sec
= find_sec(hdr
, sechdrs
, secstrings
, name
);
156 /* Section 0 has sh_addr 0 and sh_size 0. */
157 *num
= sechdrs
[sec
].sh_size
/ object_size
;
158 return (void *)sechdrs
[sec
].sh_addr
;
161 /* Provided by the linker */
162 extern const struct kernel_symbol __start___ksymtab
[];
163 extern const struct kernel_symbol __stop___ksymtab
[];
164 extern const struct kernel_symbol __start___ksymtab_gpl
[];
165 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
166 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
167 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
168 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
169 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
170 extern const unsigned long __start___kcrctab
[];
171 extern const unsigned long __start___kcrctab_gpl
[];
172 extern const unsigned long __start___kcrctab_gpl_future
[];
173 #ifdef CONFIG_UNUSED_SYMBOLS
174 extern const struct kernel_symbol __start___ksymtab_unused
[];
175 extern const struct kernel_symbol __stop___ksymtab_unused
[];
176 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
177 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
178 extern const unsigned long __start___kcrctab_unused
[];
179 extern const unsigned long __start___kcrctab_unused_gpl
[];
182 #ifndef CONFIG_MODVERSIONS
183 #define symversion(base, idx) NULL
185 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
189 const struct kernel_symbol
*start
, *stop
;
190 const unsigned long *crcs
;
199 static bool each_symbol_in_section(const struct symsearch
*arr
,
200 unsigned int arrsize
,
201 struct module
*owner
,
202 bool (*fn
)(const struct symsearch
*syms
,
203 struct module
*owner
,
204 unsigned int symnum
, void *data
),
209 for (j
= 0; j
< arrsize
; j
++) {
210 for (i
= 0; i
< arr
[j
].stop
- arr
[j
].start
; i
++)
211 if (fn(&arr
[j
], owner
, i
, data
))
218 /* Returns true as soon as fn returns true, otherwise false. */
219 static bool each_symbol(bool (*fn
)(const struct symsearch
*arr
,
220 struct module
*owner
,
221 unsigned int symnum
, void *data
),
225 const struct symsearch arr
[] = {
226 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
227 NOT_GPL_ONLY
, false },
228 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
229 __start___kcrctab_gpl
,
231 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
232 __start___kcrctab_gpl_future
,
233 WILL_BE_GPL_ONLY
, false },
234 #ifdef CONFIG_UNUSED_SYMBOLS
235 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
236 __start___kcrctab_unused
,
237 NOT_GPL_ONLY
, true },
238 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
239 __start___kcrctab_unused_gpl
,
244 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
247 list_for_each_entry_rcu(mod
, &modules
, list
) {
248 struct symsearch arr
[] = {
249 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
250 NOT_GPL_ONLY
, false },
251 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
254 { mod
->gpl_future_syms
,
255 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
256 mod
->gpl_future_crcs
,
257 WILL_BE_GPL_ONLY
, false },
258 #ifdef CONFIG_UNUSED_SYMBOLS
260 mod
->unused_syms
+ mod
->num_unused_syms
,
262 NOT_GPL_ONLY
, true },
263 { mod
->unused_gpl_syms
,
264 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
265 mod
->unused_gpl_crcs
,
270 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
276 struct find_symbol_arg
{
283 struct module
*owner
;
284 const unsigned long *crc
;
288 static bool find_symbol_in_section(const struct symsearch
*syms
,
289 struct module
*owner
,
290 unsigned int symnum
, void *data
)
292 struct find_symbol_arg
*fsa
= data
;
294 if (strcmp(syms
->start
[symnum
].name
, fsa
->name
) != 0)
298 if (syms
->licence
== GPL_ONLY
)
300 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
301 printk(KERN_WARNING
"Symbol %s is being used "
302 "by a non-GPL module, which will not "
303 "be allowed in the future\n", fsa
->name
);
304 printk(KERN_WARNING
"Please see the file "
305 "Documentation/feature-removal-schedule.txt "
306 "in the kernel source tree for more details.\n");
310 #ifdef CONFIG_UNUSED_SYMBOLS
311 if (syms
->unused
&& fsa
->warn
) {
312 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
313 "however this module is using it.\n", fsa
->name
);
315 "This symbol will go away in the future.\n");
317 "Please evalute if this is the right api to use and if "
318 "it really is, submit a report the linux kernel "
319 "mailinglist together with submitting your code for "
325 fsa
->crc
= symversion(syms
->crcs
, symnum
);
326 fsa
->value
= syms
->start
[symnum
].value
;
330 /* Find a symbol, return value, (optional) crc and (optional) module
332 static unsigned long find_symbol(const char *name
,
333 struct module
**owner
,
334 const unsigned long **crc
,
338 struct find_symbol_arg fsa
;
344 if (each_symbol(find_symbol_in_section
, &fsa
)) {
352 DEBUGP("Failed to find symbol %s\n", name
);
356 /* Search for module by name: must hold module_mutex. */
357 static struct module
*find_module(const char *name
)
361 list_for_each_entry(mod
, &modules
, list
) {
362 if (strcmp(mod
->name
, name
) == 0)
369 /* Number of blocks used and allocated. */
370 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
371 /* Size of each block. -ve means used. */
372 static int *pcpu_size
;
374 static int split_block(unsigned int i
, unsigned short size
)
376 /* Reallocation required? */
377 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
380 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
385 pcpu_num_allocated
*= 2;
389 /* Insert a new subblock */
390 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
391 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
394 pcpu_size
[i
+1] -= size
;
399 static inline unsigned int block_size(int val
)
406 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
413 if (align
> PAGE_SIZE
) {
414 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
415 name
, align
, PAGE_SIZE
);
419 ptr
= __per_cpu_start
;
420 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
421 /* Extra for alignment requirement. */
422 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
423 BUG_ON(i
== 0 && extra
!= 0);
425 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
428 /* Transfer extra to previous block. */
429 if (pcpu_size
[i
-1] < 0)
430 pcpu_size
[i
-1] -= extra
;
432 pcpu_size
[i
-1] += extra
;
433 pcpu_size
[i
] -= extra
;
436 /* Split block if warranted */
437 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
438 if (!split_block(i
, size
))
442 pcpu_size
[i
] = -pcpu_size
[i
];
446 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
451 static void percpu_modfree(void *freeme
)
454 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
456 /* First entry is core kernel percpu data. */
457 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
459 pcpu_size
[i
] = -pcpu_size
[i
];
466 /* Merge with previous? */
467 if (pcpu_size
[i
-1] >= 0) {
468 pcpu_size
[i
-1] += pcpu_size
[i
];
470 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
471 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
474 /* Merge with next? */
475 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
476 pcpu_size
[i
] += pcpu_size
[i
+1];
478 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
479 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
483 static int percpu_modinit(void)
486 pcpu_num_allocated
= 2;
487 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
489 /* Static in-kernel percpu data (used). */
490 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
492 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
493 if (pcpu_size
[1] < 0) {
494 printk(KERN_ERR
"No per-cpu room for modules.\n");
500 __initcall(percpu_modinit
);
502 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
504 const char *secstrings
)
506 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
509 static void percpu_modcopy(void *pcpudest
, const void *from
, unsigned long size
)
513 for_each_possible_cpu(cpu
)
514 memcpy(pcpudest
+ per_cpu_offset(cpu
), from
, size
);
517 #else /* ... !CONFIG_SMP */
519 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
524 static inline void percpu_modfree(void *pcpuptr
)
528 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
530 const char *secstrings
)
534 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
537 /* pcpusec should be 0, and size of that section should be 0. */
541 #endif /* CONFIG_SMP */
543 #define MODINFO_ATTR(field) \
544 static void setup_modinfo_##field(struct module *mod, const char *s) \
546 mod->field = kstrdup(s, GFP_KERNEL); \
548 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
549 struct module *mod, char *buffer) \
551 return sprintf(buffer, "%s\n", mod->field); \
553 static int modinfo_##field##_exists(struct module *mod) \
555 return mod->field != NULL; \
557 static void free_modinfo_##field(struct module *mod) \
562 static struct module_attribute modinfo_##field = { \
563 .attr = { .name = __stringify(field), .mode = 0444 }, \
564 .show = show_modinfo_##field, \
565 .setup = setup_modinfo_##field, \
566 .test = modinfo_##field##_exists, \
567 .free = free_modinfo_##field, \
570 MODINFO_ATTR(version
);
571 MODINFO_ATTR(srcversion
);
573 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
575 #ifdef CONFIG_MODULE_UNLOAD
576 /* Init the unload section of the module. */
577 static void module_unload_init(struct module
*mod
)
581 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
582 for_each_possible_cpu(cpu
)
583 local_set(__module_ref_addr(mod
, cpu
), 0);
584 /* Hold reference count during initialization. */
585 local_set(__module_ref_addr(mod
, raw_smp_processor_id()), 1);
586 /* Backwards compatibility macros put refcount during init. */
587 mod
->waiter
= current
;
590 /* modules using other modules */
593 struct list_head list
;
594 struct module
*module_which_uses
;
597 /* Does a already use b? */
598 static int already_uses(struct module
*a
, struct module
*b
)
600 struct module_use
*use
;
602 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
603 if (use
->module_which_uses
== a
) {
604 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
608 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
612 /* Module a uses b */
613 static int use_module(struct module
*a
, struct module
*b
)
615 struct module_use
*use
;
618 if (b
== NULL
|| already_uses(a
, b
)) return 1;
620 /* If we're interrupted or time out, we fail. */
621 if (wait_event_interruptible_timeout(
622 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
624 printk("%s: gave up waiting for init of module %s.\n",
629 /* If strong_try_module_get() returned a different error, we fail. */
633 DEBUGP("Allocating new usage for %s.\n", a
->name
);
634 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
636 printk("%s: out of memory loading\n", a
->name
);
641 use
->module_which_uses
= a
;
642 list_add(&use
->list
, &b
->modules_which_use_me
);
643 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
647 /* Clear the unload stuff of the module. */
648 static void module_unload_free(struct module
*mod
)
652 list_for_each_entry(i
, &modules
, list
) {
653 struct module_use
*use
;
655 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
656 if (use
->module_which_uses
== mod
) {
657 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
659 list_del(&use
->list
);
661 sysfs_remove_link(i
->holders_dir
, mod
->name
);
662 /* There can be at most one match. */
669 #ifdef CONFIG_MODULE_FORCE_UNLOAD
670 static inline int try_force_unload(unsigned int flags
)
672 int ret
= (flags
& O_TRUNC
);
674 add_taint(TAINT_FORCED_RMMOD
);
678 static inline int try_force_unload(unsigned int flags
)
682 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
691 /* Whole machine is stopped with interrupts off when this runs. */
692 static int __try_stop_module(void *_sref
)
694 struct stopref
*sref
= _sref
;
696 /* If it's not unused, quit unless we're forcing. */
697 if (module_refcount(sref
->mod
) != 0) {
698 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
702 /* Mark it as dying. */
703 sref
->mod
->state
= MODULE_STATE_GOING
;
707 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
709 if (flags
& O_NONBLOCK
) {
710 struct stopref sref
= { mod
, flags
, forced
};
712 return stop_machine(__try_stop_module
, &sref
, NULL
);
714 /* We don't need to stop the machine for this. */
715 mod
->state
= MODULE_STATE_GOING
;
721 unsigned int module_refcount(struct module
*mod
)
723 unsigned int total
= 0;
726 for_each_possible_cpu(cpu
)
727 total
+= local_read(__module_ref_addr(mod
, cpu
));
730 EXPORT_SYMBOL(module_refcount
);
732 /* This exists whether we can unload or not */
733 static void free_module(struct module
*mod
);
735 static void wait_for_zero_refcount(struct module
*mod
)
737 /* Since we might sleep for some time, release the mutex first */
738 mutex_unlock(&module_mutex
);
740 DEBUGP("Looking at refcount...\n");
741 set_current_state(TASK_UNINTERRUPTIBLE
);
742 if (module_refcount(mod
) == 0)
746 current
->state
= TASK_RUNNING
;
747 mutex_lock(&module_mutex
);
750 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
754 char name
[MODULE_NAME_LEN
];
757 if (!capable(CAP_SYS_MODULE
))
760 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
762 name
[MODULE_NAME_LEN
-1] = '\0';
764 /* Create stop_machine threads since free_module relies on
765 * a non-failing stop_machine call. */
766 ret
= stop_machine_create();
770 if (mutex_lock_interruptible(&module_mutex
) != 0) {
775 mod
= find_module(name
);
781 if (!list_empty(&mod
->modules_which_use_me
)) {
782 /* Other modules depend on us: get rid of them first. */
787 /* Doing init or already dying? */
788 if (mod
->state
!= MODULE_STATE_LIVE
) {
789 /* FIXME: if (force), slam module count and wake up
791 DEBUGP("%s already dying\n", mod
->name
);
796 /* If it has an init func, it must have an exit func to unload */
797 if (mod
->init
&& !mod
->exit
) {
798 forced
= try_force_unload(flags
);
800 /* This module can't be removed */
806 /* Set this up before setting mod->state */
807 mod
->waiter
= current
;
809 /* Stop the machine so refcounts can't move and disable module. */
810 ret
= try_stop_module(mod
, flags
, &forced
);
814 /* Never wait if forced. */
815 if (!forced
&& module_refcount(mod
) != 0)
816 wait_for_zero_refcount(mod
);
818 mutex_unlock(&module_mutex
);
819 /* Final destruction now noone is using it. */
820 if (mod
->exit
!= NULL
)
822 blocking_notifier_call_chain(&module_notify_list
,
823 MODULE_STATE_GOING
, mod
);
824 async_synchronize_full();
825 mutex_lock(&module_mutex
);
826 /* Store the name of the last unloaded module for diagnostic purposes */
827 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
828 unregister_dynamic_debug_module(mod
->name
);
832 mutex_unlock(&module_mutex
);
834 stop_machine_destroy();
838 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
840 struct module_use
*use
;
841 int printed_something
= 0;
843 seq_printf(m
, " %u ", module_refcount(mod
));
845 /* Always include a trailing , so userspace can differentiate
846 between this and the old multi-field proc format. */
847 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
848 printed_something
= 1;
849 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
852 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
853 printed_something
= 1;
854 seq_printf(m
, "[permanent],");
857 if (!printed_something
)
861 void __symbol_put(const char *symbol
)
863 struct module
*owner
;
866 if (IS_ERR_VALUE(find_symbol(symbol
, &owner
, NULL
, true, false)))
871 EXPORT_SYMBOL(__symbol_put
);
873 void symbol_put_addr(void *addr
)
875 struct module
*modaddr
;
877 if (core_kernel_text((unsigned long)addr
))
880 if (!(modaddr
= module_text_address((unsigned long)addr
)))
884 EXPORT_SYMBOL_GPL(symbol_put_addr
);
886 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
887 struct module
*mod
, char *buffer
)
889 return sprintf(buffer
, "%u\n", module_refcount(mod
));
892 static struct module_attribute refcnt
= {
893 .attr
= { .name
= "refcnt", .mode
= 0444 },
897 void module_put(struct module
*module
)
900 unsigned int cpu
= get_cpu();
901 local_dec(__module_ref_addr(module
, cpu
));
902 /* Maybe they're waiting for us to drop reference? */
903 if (unlikely(!module_is_live(module
)))
904 wake_up_process(module
->waiter
);
908 EXPORT_SYMBOL(module_put
);
910 #else /* !CONFIG_MODULE_UNLOAD */
911 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
913 /* We don't know the usage count, or what modules are using. */
914 seq_printf(m
, " - -");
917 static inline void module_unload_free(struct module
*mod
)
921 static inline int use_module(struct module
*a
, struct module
*b
)
923 return strong_try_module_get(b
) == 0;
926 static inline void module_unload_init(struct module
*mod
)
929 #endif /* CONFIG_MODULE_UNLOAD */
931 static ssize_t
show_initstate(struct module_attribute
*mattr
,
932 struct module
*mod
, char *buffer
)
934 const char *state
= "unknown";
936 switch (mod
->state
) {
937 case MODULE_STATE_LIVE
:
940 case MODULE_STATE_COMING
:
943 case MODULE_STATE_GOING
:
947 return sprintf(buffer
, "%s\n", state
);
950 static struct module_attribute initstate
= {
951 .attr
= { .name
= "initstate", .mode
= 0444 },
952 .show
= show_initstate
,
955 static struct module_attribute
*modinfo_attrs
[] = {
959 #ifdef CONFIG_MODULE_UNLOAD
965 static const char vermagic
[] = VERMAGIC_STRING
;
967 static int try_to_force_load(struct module
*mod
, const char *symname
)
969 #ifdef CONFIG_MODULE_FORCE_LOAD
970 if (!test_taint(TAINT_FORCED_MODULE
))
971 printk("%s: no version for \"%s\" found: kernel tainted.\n",
973 add_taint_module(mod
, TAINT_FORCED_MODULE
);
980 #ifdef CONFIG_MODVERSIONS
981 static int check_version(Elf_Shdr
*sechdrs
,
982 unsigned int versindex
,
985 const unsigned long *crc
)
987 unsigned int i
, num_versions
;
988 struct modversion_info
*versions
;
990 /* Exporting module didn't supply crcs? OK, we're already tainted. */
994 /* No versions at all? modprobe --force does this. */
996 return try_to_force_load(mod
, symname
) == 0;
998 versions
= (void *) sechdrs
[versindex
].sh_addr
;
999 num_versions
= sechdrs
[versindex
].sh_size
1000 / sizeof(struct modversion_info
);
1002 for (i
= 0; i
< num_versions
; i
++) {
1003 if (strcmp(versions
[i
].name
, symname
) != 0)
1006 if (versions
[i
].crc
== *crc
)
1008 DEBUGP("Found checksum %lX vs module %lX\n",
1009 *crc
, versions
[i
].crc
);
1013 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1014 mod
->name
, symname
);
1018 printk("%s: disagrees about version of symbol %s\n",
1019 mod
->name
, symname
);
1023 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1024 unsigned int versindex
,
1027 const unsigned long *crc
;
1029 if (IS_ERR_VALUE(find_symbol("struct_module", NULL
, &crc
, true, false)))
1031 return check_version(sechdrs
, versindex
, "struct_module", mod
, crc
);
1034 /* First part is kernel version, which we ignore if module has crcs. */
1035 static inline int same_magic(const char *amagic
, const char *bmagic
,
1039 amagic
+= strcspn(amagic
, " ");
1040 bmagic
+= strcspn(bmagic
, " ");
1042 return strcmp(amagic
, bmagic
) == 0;
1045 static inline int check_version(Elf_Shdr
*sechdrs
,
1046 unsigned int versindex
,
1047 const char *symname
,
1049 const unsigned long *crc
)
1054 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1055 unsigned int versindex
,
1061 static inline int same_magic(const char *amagic
, const char *bmagic
,
1064 return strcmp(amagic
, bmagic
) == 0;
1066 #endif /* CONFIG_MODVERSIONS */
1068 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1069 Must be holding module_mutex. */
1070 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
1071 unsigned int versindex
,
1075 struct module
*owner
;
1077 const unsigned long *crc
;
1079 ret
= find_symbol(name
, &owner
, &crc
,
1080 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1081 if (!IS_ERR_VALUE(ret
)) {
1082 /* use_module can fail due to OOM,
1083 or module initialization or unloading */
1084 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
1085 !use_module(mod
, owner
))
1092 * /sys/module/foo/sections stuff
1093 * J. Corbet <corbet@lwn.net>
1095 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1096 struct module_sect_attr
1098 struct module_attribute mattr
;
1100 unsigned long address
;
1103 struct module_sect_attrs
1105 struct attribute_group grp
;
1106 unsigned int nsections
;
1107 struct module_sect_attr attrs
[0];
1110 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1111 struct module
*mod
, char *buf
)
1113 struct module_sect_attr
*sattr
=
1114 container_of(mattr
, struct module_sect_attr
, mattr
);
1115 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1118 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1120 unsigned int section
;
1122 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1123 kfree(sect_attrs
->attrs
[section
].name
);
1127 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1128 char *secstrings
, Elf_Shdr
*sechdrs
)
1130 unsigned int nloaded
= 0, i
, size
[2];
1131 struct module_sect_attrs
*sect_attrs
;
1132 struct module_sect_attr
*sattr
;
1133 struct attribute
**gattr
;
1135 /* Count loaded sections and allocate structures */
1136 for (i
= 0; i
< nsect
; i
++)
1137 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1139 size
[0] = ALIGN(sizeof(*sect_attrs
)
1140 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1141 sizeof(sect_attrs
->grp
.attrs
[0]));
1142 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1143 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1144 if (sect_attrs
== NULL
)
1147 /* Setup section attributes. */
1148 sect_attrs
->grp
.name
= "sections";
1149 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1151 sect_attrs
->nsections
= 0;
1152 sattr
= §_attrs
->attrs
[0];
1153 gattr
= §_attrs
->grp
.attrs
[0];
1154 for (i
= 0; i
< nsect
; i
++) {
1155 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1157 sattr
->address
= sechdrs
[i
].sh_addr
;
1158 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1160 if (sattr
->name
== NULL
)
1162 sect_attrs
->nsections
++;
1163 sattr
->mattr
.show
= module_sect_show
;
1164 sattr
->mattr
.store
= NULL
;
1165 sattr
->mattr
.attr
.name
= sattr
->name
;
1166 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1167 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1171 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1174 mod
->sect_attrs
= sect_attrs
;
1177 free_sect_attrs(sect_attrs
);
1180 static void remove_sect_attrs(struct module
*mod
)
1182 if (mod
->sect_attrs
) {
1183 sysfs_remove_group(&mod
->mkobj
.kobj
,
1184 &mod
->sect_attrs
->grp
);
1185 /* We are positive that no one is using any sect attrs
1186 * at this point. Deallocate immediately. */
1187 free_sect_attrs(mod
->sect_attrs
);
1188 mod
->sect_attrs
= NULL
;
1193 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1196 struct module_notes_attrs
{
1197 struct kobject
*dir
;
1199 struct bin_attribute attrs
[0];
1202 static ssize_t
module_notes_read(struct kobject
*kobj
,
1203 struct bin_attribute
*bin_attr
,
1204 char *buf
, loff_t pos
, size_t count
)
1207 * The caller checked the pos and count against our size.
1209 memcpy(buf
, bin_attr
->private + pos
, count
);
1213 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1216 if (notes_attrs
->dir
) {
1218 sysfs_remove_bin_file(notes_attrs
->dir
,
1219 ¬es_attrs
->attrs
[i
]);
1220 kobject_put(notes_attrs
->dir
);
1225 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1226 char *secstrings
, Elf_Shdr
*sechdrs
)
1228 unsigned int notes
, loaded
, i
;
1229 struct module_notes_attrs
*notes_attrs
;
1230 struct bin_attribute
*nattr
;
1232 /* Count notes sections and allocate structures. */
1234 for (i
= 0; i
< nsect
; i
++)
1235 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1236 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1242 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1243 + notes
* sizeof(notes_attrs
->attrs
[0]),
1245 if (notes_attrs
== NULL
)
1248 notes_attrs
->notes
= notes
;
1249 nattr
= ¬es_attrs
->attrs
[0];
1250 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1251 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1253 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1254 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1255 nattr
->attr
.mode
= S_IRUGO
;
1256 nattr
->size
= sechdrs
[i
].sh_size
;
1257 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1258 nattr
->read
= module_notes_read
;
1264 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1265 if (!notes_attrs
->dir
)
1268 for (i
= 0; i
< notes
; ++i
)
1269 if (sysfs_create_bin_file(notes_attrs
->dir
,
1270 ¬es_attrs
->attrs
[i
]))
1273 mod
->notes_attrs
= notes_attrs
;
1277 free_notes_attrs(notes_attrs
, i
);
1280 static void remove_notes_attrs(struct module
*mod
)
1282 if (mod
->notes_attrs
)
1283 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1288 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1289 char *sectstrings
, Elf_Shdr
*sechdrs
)
1293 static inline void remove_sect_attrs(struct module
*mod
)
1297 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1298 char *sectstrings
, Elf_Shdr
*sechdrs
)
1302 static inline void remove_notes_attrs(struct module
*mod
)
1308 int module_add_modinfo_attrs(struct module
*mod
)
1310 struct module_attribute
*attr
;
1311 struct module_attribute
*temp_attr
;
1315 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1316 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1318 if (!mod
->modinfo_attrs
)
1321 temp_attr
= mod
->modinfo_attrs
;
1322 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1324 (attr
->test
&& attr
->test(mod
))) {
1325 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1326 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1333 void module_remove_modinfo_attrs(struct module
*mod
)
1335 struct module_attribute
*attr
;
1338 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1339 /* pick a field to test for end of list */
1340 if (!attr
->attr
.name
)
1342 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1346 kfree(mod
->modinfo_attrs
);
1349 int mod_sysfs_init(struct module
*mod
)
1352 struct kobject
*kobj
;
1354 if (!module_sysfs_initialized
) {
1355 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1361 kobj
= kset_find_obj(module_kset
, mod
->name
);
1363 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1369 mod
->mkobj
.mod
= mod
;
1371 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1372 mod
->mkobj
.kobj
.kset
= module_kset
;
1373 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1376 kobject_put(&mod
->mkobj
.kobj
);
1378 /* delay uevent until full sysfs population */
1383 int mod_sysfs_setup(struct module
*mod
,
1384 struct kernel_param
*kparam
,
1385 unsigned int num_params
)
1389 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1390 if (!mod
->holders_dir
) {
1395 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1397 goto out_unreg_holders
;
1399 err
= module_add_modinfo_attrs(mod
);
1401 goto out_unreg_param
;
1403 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1407 module_param_sysfs_remove(mod
);
1409 kobject_put(mod
->holders_dir
);
1411 kobject_put(&mod
->mkobj
.kobj
);
1415 static void mod_sysfs_fini(struct module
*mod
)
1417 kobject_put(&mod
->mkobj
.kobj
);
1420 #else /* CONFIG_SYSFS */
1422 static void mod_sysfs_fini(struct module
*mod
)
1426 #endif /* CONFIG_SYSFS */
1428 static void mod_kobject_remove(struct module
*mod
)
1430 module_remove_modinfo_attrs(mod
);
1431 module_param_sysfs_remove(mod
);
1432 kobject_put(mod
->mkobj
.drivers_dir
);
1433 kobject_put(mod
->holders_dir
);
1434 mod_sysfs_fini(mod
);
1438 * unlink the module with the whole machine is stopped with interrupts off
1439 * - this defends against kallsyms not taking locks
1441 static int __unlink_module(void *_mod
)
1443 struct module
*mod
= _mod
;
1444 list_del(&mod
->list
);
1448 /* Free a module, remove from lists, etc (must hold module_mutex). */
1449 static void free_module(struct module
*mod
)
1451 /* Delete from various lists */
1452 stop_machine(__unlink_module
, mod
, NULL
);
1453 remove_notes_attrs(mod
);
1454 remove_sect_attrs(mod
);
1455 mod_kobject_remove(mod
);
1457 /* Arch-specific cleanup. */
1458 module_arch_cleanup(mod
);
1460 /* Module unload stuff */
1461 module_unload_free(mod
);
1463 /* release any pointers to mcount in this module */
1464 ftrace_release(mod
->module_core
, mod
->core_size
);
1466 /* This may be NULL, but that's OK */
1467 module_free(mod
, mod
->module_init
);
1470 percpu_modfree(mod
->percpu
);
1471 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1473 percpu_modfree(mod
->refptr
);
1475 /* Free lock-classes: */
1476 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1478 /* Finally, free the core (containing the module structure) */
1479 module_free(mod
, mod
->module_core
);
1482 void *__symbol_get(const char *symbol
)
1484 struct module
*owner
;
1485 unsigned long value
;
1488 value
= find_symbol(symbol
, &owner
, NULL
, true, true);
1489 if (IS_ERR_VALUE(value
))
1491 else if (strong_try_module_get(owner
))
1495 return (void *)value
;
1497 EXPORT_SYMBOL_GPL(__symbol_get
);
1500 * Ensure that an exported symbol [global namespace] does not already exist
1501 * in the kernel or in some other module's exported symbol table.
1503 static int verify_export_symbols(struct module
*mod
)
1506 struct module
*owner
;
1507 const struct kernel_symbol
*s
;
1509 const struct kernel_symbol
*sym
;
1512 { mod
->syms
, mod
->num_syms
},
1513 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1514 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1515 #ifdef CONFIG_UNUSED_SYMBOLS
1516 { mod
->unused_syms
, mod
->num_unused_syms
},
1517 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1521 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1522 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1523 if (!IS_ERR_VALUE(find_symbol(s
->name
, &owner
,
1524 NULL
, true, false))) {
1526 "%s: exports duplicate symbol %s"
1528 mod
->name
, s
->name
, module_name(owner
));
1536 /* Change all symbols so that st_value encodes the pointer directly. */
1537 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1538 unsigned int symindex
,
1540 unsigned int versindex
,
1541 unsigned int pcpuindex
,
1544 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1545 unsigned long secbase
;
1546 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1549 for (i
= 1; i
< n
; i
++) {
1550 switch (sym
[i
].st_shndx
) {
1552 /* We compiled with -fno-common. These are not
1553 supposed to happen. */
1554 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1555 printk("%s: please compile with -fno-common\n",
1561 /* Don't need to do anything */
1562 DEBUGP("Absolute symbol: 0x%08lx\n",
1563 (long)sym
[i
].st_value
);
1568 = resolve_symbol(sechdrs
, versindex
,
1569 strtab
+ sym
[i
].st_name
, mod
);
1571 /* Ok if resolved. */
1572 if (!IS_ERR_VALUE(sym
[i
].st_value
))
1575 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1578 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1579 mod
->name
, strtab
+ sym
[i
].st_name
);
1584 /* Divert to percpu allocation if a percpu var. */
1585 if (sym
[i
].st_shndx
== pcpuindex
)
1586 secbase
= (unsigned long)mod
->percpu
;
1588 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1589 sym
[i
].st_value
+= secbase
;
1597 /* Additional bytes needed by arch in front of individual sections */
1598 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1599 unsigned int section
)
1601 /* default implementation just returns zero */
1605 /* Update size with this section: return offset. */
1606 static long get_offset(struct module
*mod
, unsigned int *size
,
1607 Elf_Shdr
*sechdr
, unsigned int section
)
1611 *size
+= arch_mod_section_prepend(mod
, section
);
1612 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1613 *size
= ret
+ sechdr
->sh_size
;
1617 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1618 might -- code, read-only data, read-write data, small data. Tally
1619 sizes, and place the offsets into sh_entsize fields: high bit means it
1621 static void layout_sections(struct module
*mod
,
1622 const Elf_Ehdr
*hdr
,
1624 const char *secstrings
)
1626 static unsigned long const masks
[][2] = {
1627 /* NOTE: all executable code must be the first section
1628 * in this array; otherwise modify the text_size
1629 * finder in the two loops below */
1630 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1631 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1632 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1633 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1637 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1638 sechdrs
[i
].sh_entsize
= ~0UL;
1640 DEBUGP("Core section allocation order:\n");
1641 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1642 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1643 Elf_Shdr
*s
= &sechdrs
[i
];
1645 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1646 || (s
->sh_flags
& masks
[m
][1])
1647 || s
->sh_entsize
!= ~0UL
1648 || strncmp(secstrings
+ s
->sh_name
,
1651 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1652 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1655 mod
->core_text_size
= mod
->core_size
;
1658 DEBUGP("Init section allocation order:\n");
1659 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1660 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1661 Elf_Shdr
*s
= &sechdrs
[i
];
1663 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1664 || (s
->sh_flags
& masks
[m
][1])
1665 || s
->sh_entsize
!= ~0UL
1666 || strncmp(secstrings
+ s
->sh_name
,
1669 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1670 | INIT_OFFSET_MASK
);
1671 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1674 mod
->init_text_size
= mod
->init_size
;
1678 static void set_license(struct module
*mod
, const char *license
)
1681 license
= "unspecified";
1683 if (!license_is_gpl_compatible(license
)) {
1684 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1685 printk(KERN_WARNING
"%s: module license '%s' taints "
1686 "kernel.\n", mod
->name
, license
);
1687 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1691 /* Parse tag=value strings from .modinfo section */
1692 static char *next_string(char *string
, unsigned long *secsize
)
1694 /* Skip non-zero chars */
1697 if ((*secsize
)-- <= 1)
1701 /* Skip any zero padding. */
1702 while (!string
[0]) {
1704 if ((*secsize
)-- <= 1)
1710 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1715 unsigned int taglen
= strlen(tag
);
1716 unsigned long size
= sechdrs
[info
].sh_size
;
1718 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1719 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1720 return p
+ taglen
+ 1;
1725 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1726 unsigned int infoindex
)
1728 struct module_attribute
*attr
;
1731 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1734 get_modinfo(sechdrs
,
1740 #ifdef CONFIG_KALLSYMS
1742 /* lookup symbol in given range of kernel_symbols */
1743 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1744 const struct kernel_symbol
*start
,
1745 const struct kernel_symbol
*stop
)
1747 const struct kernel_symbol
*ks
= start
;
1748 for (; ks
< stop
; ks
++)
1749 if (strcmp(ks
->name
, name
) == 0)
1754 static int is_exported(const char *name
, unsigned long value
,
1755 const struct module
*mod
)
1757 const struct kernel_symbol
*ks
;
1759 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1761 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1762 return ks
!= NULL
&& ks
->value
== value
;
1766 static char elf_type(const Elf_Sym
*sym
,
1768 const char *secstrings
,
1771 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1772 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1777 if (sym
->st_shndx
== SHN_UNDEF
)
1779 if (sym
->st_shndx
== SHN_ABS
)
1781 if (sym
->st_shndx
>= SHN_LORESERVE
)
1783 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1785 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1786 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1787 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1789 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1794 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1795 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1800 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1801 ".debug", strlen(".debug")) == 0)
1806 static void add_kallsyms(struct module
*mod
,
1808 unsigned int symindex
,
1809 unsigned int strindex
,
1810 const char *secstrings
)
1814 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1815 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1816 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1818 /* Set types up while we still have access to sections. */
1819 for (i
= 0; i
< mod
->num_symtab
; i
++)
1820 mod
->symtab
[i
].st_info
1821 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1824 static inline void add_kallsyms(struct module
*mod
,
1826 unsigned int symindex
,
1827 unsigned int strindex
,
1828 const char *secstrings
)
1831 #endif /* CONFIG_KALLSYMS */
1833 static void dynamic_printk_setup(struct mod_debug
*debug
, unsigned int num
)
1835 #ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
1838 for (i
= 0; i
< num
; i
++) {
1839 register_dynamic_debug_module(debug
[i
].modname
,
1841 debug
[i
].logical_modname
,
1842 debug
[i
].flag_names
,
1843 debug
[i
].hash
, debug
[i
].hash2
);
1845 #endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
1848 static void *module_alloc_update_bounds(unsigned long size
)
1850 void *ret
= module_alloc(size
);
1853 /* Update module bounds. */
1854 if ((unsigned long)ret
< module_addr_min
)
1855 module_addr_min
= (unsigned long)ret
;
1856 if ((unsigned long)ret
+ size
> module_addr_max
)
1857 module_addr_max
= (unsigned long)ret
+ size
;
1862 /* Allocate and load the module: note that size of section 0 is always
1863 zero, and we rely on this for optional sections. */
1864 static noinline
struct module
*load_module(void __user
*umod
,
1866 const char __user
*uargs
)
1870 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1873 unsigned int symindex
= 0;
1874 unsigned int strindex
= 0;
1875 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
1876 unsigned int num_kp
, num_mcount
;
1877 struct kernel_param
*kp
;
1880 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1881 unsigned long *mseg
;
1882 mm_segment_t old_fs
;
1884 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1886 if (len
< sizeof(*hdr
))
1887 return ERR_PTR(-ENOEXEC
);
1889 /* Suck in entire file: we'll want most of it. */
1890 /* vmalloc barfs on "unusual" numbers. Check here */
1891 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1892 return ERR_PTR(-ENOMEM
);
1894 /* Create stop_machine threads since the error path relies on
1895 * a non-failing stop_machine call. */
1896 err
= stop_machine_create();
1900 if (copy_from_user(hdr
, umod
, len
) != 0) {
1905 /* Sanity checks against insmoding binaries or wrong arch,
1906 weird elf version */
1907 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
1908 || hdr
->e_type
!= ET_REL
1909 || !elf_check_arch(hdr
)
1910 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1915 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1918 /* Convenience variables */
1919 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1920 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1921 sechdrs
[0].sh_addr
= 0;
1923 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1924 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1925 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1928 /* Mark all sections sh_addr with their address in the
1930 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1932 /* Internal symbols and strings. */
1933 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1935 strindex
= sechdrs
[i
].sh_link
;
1936 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1938 #ifndef CONFIG_MODULE_UNLOAD
1939 /* Don't load .exit sections */
1940 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1941 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1945 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1946 ".gnu.linkonce.this_module");
1948 printk(KERN_WARNING
"No module found in object\n");
1952 /* This is temporary: point mod into copy of data. */
1953 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1955 if (symindex
== 0) {
1956 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1962 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1963 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1964 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1966 /* Don't keep modinfo and version sections. */
1967 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1968 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1969 #ifdef CONFIG_KALLSYMS
1970 /* Keep symbol and string tables for decoding later. */
1971 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1972 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1975 /* Check module struct version now, before we try to use module. */
1976 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1981 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1982 /* This is allowed: modprobe --force will invalidate it. */
1984 err
= try_to_force_load(mod
, "magic");
1987 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
1988 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1989 mod
->name
, modmagic
, vermagic
);
1994 staging
= get_modinfo(sechdrs
, infoindex
, "staging");
1996 add_taint_module(mod
, TAINT_CRAP
);
1997 printk(KERN_WARNING
"%s: module is from the staging directory,"
1998 " the quality is unknown, you have been warned.\n",
2002 /* Now copy in args */
2003 args
= strndup_user(uargs
, ~0UL >> 1);
2005 err
= PTR_ERR(args
);
2009 if (find_module(mod
->name
)) {
2014 mod
->state
= MODULE_STATE_COMING
;
2016 /* Allow arches to frob section contents and sizes. */
2017 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2021 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2022 mod
->refptr
= percpu_modalloc(sizeof(local_t
), __alignof__(local_t
),
2030 /* We have a special allocation for this section. */
2031 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
2032 sechdrs
[pcpuindex
].sh_addralign
,
2038 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2039 mod
->percpu
= percpu
;
2042 /* Determine total sizes, and put offsets in sh_entsize. For now
2043 this is done generically; there doesn't appear to be any
2044 special cases for the architectures. */
2045 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2047 /* Do the allocs. */
2048 ptr
= module_alloc_update_bounds(mod
->core_size
);
2053 memset(ptr
, 0, mod
->core_size
);
2054 mod
->module_core
= ptr
;
2056 ptr
= module_alloc_update_bounds(mod
->init_size
);
2057 if (!ptr
&& mod
->init_size
) {
2061 memset(ptr
, 0, mod
->init_size
);
2062 mod
->module_init
= ptr
;
2064 /* Transfer each section which specifies SHF_ALLOC */
2065 DEBUGP("final section addresses:\n");
2066 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2069 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2072 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2073 dest
= mod
->module_init
2074 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2076 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2078 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2079 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2080 sechdrs
[i
].sh_size
);
2081 /* Update sh_addr to point to copy in image. */
2082 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2083 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2085 /* Module has been moved. */
2086 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2088 /* Now we've moved module, initialize linked lists, etc. */
2089 module_unload_init(mod
);
2091 /* add kobject, so we can reference it. */
2092 err
= mod_sysfs_init(mod
);
2096 /* Set up license info based on the info section */
2097 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2100 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2101 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2102 * using GPL-only symbols it needs.
2104 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2105 add_taint(TAINT_PROPRIETARY_MODULE
);
2107 /* driverloader was caught wrongly pretending to be under GPL */
2108 if (strcmp(mod
->name
, "driverloader") == 0)
2109 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2111 /* Set up MODINFO_ATTR fields */
2112 setup_modinfo(mod
, sechdrs
, infoindex
);
2114 /* Fix up syms, so that st_value is a pointer to location. */
2115 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2120 /* Now we've got everything in the final locations, we can
2121 * find optional sections. */
2122 kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param", sizeof(*kp
),
2124 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2125 sizeof(*mod
->syms
), &mod
->num_syms
);
2126 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2127 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2128 sizeof(*mod
->gpl_syms
),
2129 &mod
->num_gpl_syms
);
2130 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2131 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2132 "__ksymtab_gpl_future",
2133 sizeof(*mod
->gpl_future_syms
),
2134 &mod
->num_gpl_future_syms
);
2135 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2136 "__kcrctab_gpl_future");
2138 #ifdef CONFIG_UNUSED_SYMBOLS
2139 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2141 sizeof(*mod
->unused_syms
),
2142 &mod
->num_unused_syms
);
2143 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2144 "__kcrctab_unused");
2145 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2146 "__ksymtab_unused_gpl",
2147 sizeof(*mod
->unused_gpl_syms
),
2148 &mod
->num_unused_gpl_syms
);
2149 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2150 "__kcrctab_unused_gpl");
2153 #ifdef CONFIG_MARKERS
2154 mod
->markers
= section_objs(hdr
, sechdrs
, secstrings
, "__markers",
2155 sizeof(*mod
->markers
), &mod
->num_markers
);
2157 #ifdef CONFIG_TRACEPOINTS
2158 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2160 sizeof(*mod
->tracepoints
),
2161 &mod
->num_tracepoints
);
2164 #ifdef CONFIG_MODVERSIONS
2165 if ((mod
->num_syms
&& !mod
->crcs
)
2166 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2167 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2168 #ifdef CONFIG_UNUSED_SYMBOLS
2169 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2170 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2173 printk(KERN_WARNING
"%s: No versions for exported symbols.\n", mod
->name
);
2174 err
= try_to_force_load(mod
, "nocrc");
2180 /* Now do relocations. */
2181 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2182 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2183 unsigned int info
= sechdrs
[i
].sh_info
;
2185 /* Not a valid relocation section? */
2186 if (info
>= hdr
->e_shnum
)
2189 /* Don't bother with non-allocated sections */
2190 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2193 if (sechdrs
[i
].sh_type
== SHT_REL
)
2194 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2195 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2196 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2202 /* Find duplicate symbols */
2203 err
= verify_export_symbols(mod
);
2207 /* Set up and sort exception table */
2208 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2209 sizeof(*mod
->extable
), &mod
->num_exentries
);
2210 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2212 /* Finally, copy percpu area over. */
2213 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2214 sechdrs
[pcpuindex
].sh_size
);
2216 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2219 struct mod_debug
*debug
;
2220 unsigned int num_debug
;
2222 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2223 sizeof(*debug
), &num_debug
);
2224 dynamic_printk_setup(debug
, num_debug
);
2227 /* sechdrs[0].sh_size is always zero */
2228 mseg
= section_objs(hdr
, sechdrs
, secstrings
, "__mcount_loc",
2229 sizeof(*mseg
), &num_mcount
);
2230 ftrace_init_module(mod
, mseg
, mseg
+ num_mcount
);
2232 err
= module_finalize(hdr
, sechdrs
, mod
);
2236 /* flush the icache in correct context */
2241 * Flush the instruction cache, since we've played with text.
2242 * Do it before processing of module parameters, so the module
2243 * can provide parameter accessor functions of its own.
2245 if (mod
->module_init
)
2246 flush_icache_range((unsigned long)mod
->module_init
,
2247 (unsigned long)mod
->module_init
2249 flush_icache_range((unsigned long)mod
->module_core
,
2250 (unsigned long)mod
->module_core
+ mod
->core_size
);
2255 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2256 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2259 /* Now sew it into the lists so we can get lockdep and oops
2260 * info during argument parsing. Noone should access us, since
2261 * strong_try_module_get() will fail.
2262 * lockdep/oops can run asynchronous, so use the RCU list insertion
2263 * function to insert in a way safe to concurrent readers.
2264 * The mutex protects against concurrent writers.
2266 list_add_rcu(&mod
->list
, &modules
);
2268 err
= parse_args(mod
->name
, mod
->args
, kp
, num_kp
, NULL
);
2272 err
= mod_sysfs_setup(mod
, kp
, num_kp
);
2275 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2276 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2278 /* Get rid of temporary copy */
2281 stop_machine_destroy();
2286 stop_machine(__unlink_module
, mod
, NULL
);
2287 module_arch_cleanup(mod
);
2289 kobject_del(&mod
->mkobj
.kobj
);
2290 kobject_put(&mod
->mkobj
.kobj
);
2291 ftrace_release(mod
->module_core
, mod
->core_size
);
2293 module_unload_free(mod
);
2294 module_free(mod
, mod
->module_init
);
2296 module_free(mod
, mod
->module_core
);
2299 percpu_modfree(percpu
);
2300 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2301 percpu_modfree(mod
->refptr
);
2307 stop_machine_destroy();
2308 return ERR_PTR(err
);
2311 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2316 /* This is where the real work happens */
2317 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2318 unsigned long, len
, const char __user
*, uargs
)
2323 /* Must have permission */
2324 if (!capable(CAP_SYS_MODULE
))
2327 /* Only one module load at a time, please */
2328 if (mutex_lock_interruptible(&module_mutex
) != 0)
2331 /* Do all the hard work */
2332 mod
= load_module(umod
, len
, uargs
);
2334 mutex_unlock(&module_mutex
);
2335 return PTR_ERR(mod
);
2338 /* Drop lock so they can recurse */
2339 mutex_unlock(&module_mutex
);
2341 blocking_notifier_call_chain(&module_notify_list
,
2342 MODULE_STATE_COMING
, mod
);
2344 /* Start the module */
2345 if (mod
->init
!= NULL
)
2346 ret
= do_one_initcall(mod
->init
);
2348 /* Init routine failed: abort. Try to protect us from
2349 buggy refcounters. */
2350 mod
->state
= MODULE_STATE_GOING
;
2351 synchronize_sched();
2353 blocking_notifier_call_chain(&module_notify_list
,
2354 MODULE_STATE_GOING
, mod
);
2355 mutex_lock(&module_mutex
);
2357 mutex_unlock(&module_mutex
);
2358 wake_up(&module_wq
);
2362 printk(KERN_WARNING
"%s: '%s'->init suspiciously returned %d, "
2363 "it should follow 0/-E convention\n"
2364 KERN_WARNING
"%s: loading module anyway...\n",
2365 __func__
, mod
->name
, ret
,
2370 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2371 mod
->state
= MODULE_STATE_LIVE
;
2372 wake_up(&module_wq
);
2373 blocking_notifier_call_chain(&module_notify_list
,
2374 MODULE_STATE_LIVE
, mod
);
2376 mutex_lock(&module_mutex
);
2377 /* Drop initial reference. */
2379 module_free(mod
, mod
->module_init
);
2380 mod
->module_init
= NULL
;
2382 mod
->init_text_size
= 0;
2383 mutex_unlock(&module_mutex
);
2388 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2390 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2393 #ifdef CONFIG_KALLSYMS
2395 * This ignores the intensely annoying "mapping symbols" found
2396 * in ARM ELF files: $a, $t and $d.
2398 static inline int is_arm_mapping_symbol(const char *str
)
2400 return str
[0] == '$' && strchr("atd", str
[1])
2401 && (str
[2] == '\0' || str
[2] == '.');
2404 static const char *get_ksymbol(struct module
*mod
,
2406 unsigned long *size
,
2407 unsigned long *offset
)
2409 unsigned int i
, best
= 0;
2410 unsigned long nextval
;
2412 /* At worse, next value is at end of module */
2413 if (within_module_init(addr
, mod
))
2414 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2416 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2418 /* Scan for closest preceeding symbol, and next symbol. (ELF
2419 starts real symbols at 1). */
2420 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2421 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2424 /* We ignore unnamed symbols: they're uninformative
2425 * and inserted at a whim. */
2426 if (mod
->symtab
[i
].st_value
<= addr
2427 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2428 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2429 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2431 if (mod
->symtab
[i
].st_value
> addr
2432 && mod
->symtab
[i
].st_value
< nextval
2433 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2434 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2435 nextval
= mod
->symtab
[i
].st_value
;
2442 *size
= nextval
- mod
->symtab
[best
].st_value
;
2444 *offset
= addr
- mod
->symtab
[best
].st_value
;
2445 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2448 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2449 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2450 const char *module_address_lookup(unsigned long addr
,
2451 unsigned long *size
,
2452 unsigned long *offset
,
2457 const char *ret
= NULL
;
2460 list_for_each_entry_rcu(mod
, &modules
, list
) {
2461 if (within_module_init(addr
, mod
) ||
2462 within_module_core(addr
, mod
)) {
2464 *modname
= mod
->name
;
2465 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2469 /* Make a copy in here where it's safe */
2471 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2478 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2483 list_for_each_entry_rcu(mod
, &modules
, list
) {
2484 if (within_module_init(addr
, mod
) ||
2485 within_module_core(addr
, mod
)) {
2488 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2491 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2501 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2502 unsigned long *offset
, char *modname
, char *name
)
2507 list_for_each_entry_rcu(mod
, &modules
, list
) {
2508 if (within_module_init(addr
, mod
) ||
2509 within_module_core(addr
, mod
)) {
2512 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2516 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2518 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2528 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2529 char *name
, char *module_name
, int *exported
)
2534 list_for_each_entry_rcu(mod
, &modules
, list
) {
2535 if (symnum
< mod
->num_symtab
) {
2536 *value
= mod
->symtab
[symnum
].st_value
;
2537 *type
= mod
->symtab
[symnum
].st_info
;
2538 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2540 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2541 *exported
= is_exported(name
, *value
, mod
);
2545 symnum
-= mod
->num_symtab
;
2551 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2555 for (i
= 0; i
< mod
->num_symtab
; i
++)
2556 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2557 mod
->symtab
[i
].st_info
!= 'U')
2558 return mod
->symtab
[i
].st_value
;
2562 /* Look for this name: can be of form module:name. */
2563 unsigned long module_kallsyms_lookup_name(const char *name
)
2567 unsigned long ret
= 0;
2569 /* Don't lock: we're in enough trouble already. */
2571 if ((colon
= strchr(name
, ':')) != NULL
) {
2573 if ((mod
= find_module(name
)) != NULL
)
2574 ret
= mod_find_symname(mod
, colon
+1);
2577 list_for_each_entry_rcu(mod
, &modules
, list
)
2578 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2584 #endif /* CONFIG_KALLSYMS */
2586 static char *module_flags(struct module
*mod
, char *buf
)
2591 mod
->state
== MODULE_STATE_GOING
||
2592 mod
->state
== MODULE_STATE_COMING
) {
2594 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2596 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2598 if (mod
->taints
& (1 << TAINT_CRAP
))
2601 * TAINT_FORCED_RMMOD: could be added.
2602 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2606 /* Show a - for module-is-being-unloaded */
2607 if (mod
->state
== MODULE_STATE_GOING
)
2609 /* Show a + for module-is-being-loaded */
2610 if (mod
->state
== MODULE_STATE_COMING
)
2619 #ifdef CONFIG_PROC_FS
2620 /* Called by the /proc file system to return a list of modules. */
2621 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2623 mutex_lock(&module_mutex
);
2624 return seq_list_start(&modules
, *pos
);
2627 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2629 return seq_list_next(p
, &modules
, pos
);
2632 static void m_stop(struct seq_file
*m
, void *p
)
2634 mutex_unlock(&module_mutex
);
2637 static int m_show(struct seq_file
*m
, void *p
)
2639 struct module
*mod
= list_entry(p
, struct module
, list
);
2642 seq_printf(m
, "%s %u",
2643 mod
->name
, mod
->init_size
+ mod
->core_size
);
2644 print_unload_info(m
, mod
);
2646 /* Informative for users. */
2647 seq_printf(m
, " %s",
2648 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2649 mod
->state
== MODULE_STATE_COMING
? "Loading":
2651 /* Used by oprofile and other similar tools. */
2652 seq_printf(m
, " 0x%p", mod
->module_core
);
2656 seq_printf(m
, " %s", module_flags(mod
, buf
));
2658 seq_printf(m
, "\n");
2662 /* Format: modulename size refcount deps address
2664 Where refcount is a number or -, and deps is a comma-separated list
2667 static const struct seq_operations modules_op
= {
2674 static int modules_open(struct inode
*inode
, struct file
*file
)
2676 return seq_open(file
, &modules_op
);
2679 static const struct file_operations proc_modules_operations
= {
2680 .open
= modules_open
,
2682 .llseek
= seq_lseek
,
2683 .release
= seq_release
,
2686 static int __init
proc_modules_init(void)
2688 proc_create("modules", 0, NULL
, &proc_modules_operations
);
2691 module_init(proc_modules_init
);
2694 /* Given an address, look for it in the module exception tables. */
2695 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2697 const struct exception_table_entry
*e
= NULL
;
2701 list_for_each_entry_rcu(mod
, &modules
, list
) {
2702 if (mod
->num_exentries
== 0)
2705 e
= search_extable(mod
->extable
,
2706 mod
->extable
+ mod
->num_exentries
- 1,
2713 /* Now, if we found one, we are running inside it now, hence
2714 we cannot unload the module, hence no refcnt needed. */
2719 * Is this a valid module address?
2721 int is_module_address(unsigned long addr
)
2727 list_for_each_entry_rcu(mod
, &modules
, list
) {
2728 if (within_module_core(addr
, mod
)) {
2740 /* Is this a valid kernel address? */
2741 __notrace_funcgraph
struct module
*__module_text_address(unsigned long addr
)
2745 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2748 list_for_each_entry_rcu(mod
, &modules
, list
)
2749 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2750 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2755 struct module
*module_text_address(unsigned long addr
)
2760 mod
= __module_text_address(addr
);
2766 /* Don't grab lock, we're oopsing. */
2767 void print_modules(void)
2772 printk("Modules linked in:");
2773 /* Most callers should already have preempt disabled, but make sure */
2775 list_for_each_entry_rcu(mod
, &modules
, list
)
2776 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2778 if (last_unloaded_module
[0])
2779 printk(" [last unloaded: %s]", last_unloaded_module
);
2783 #ifdef CONFIG_MODVERSIONS
2784 /* Generate the signature for struct module here, too, for modversions. */
2785 void struct_module(struct module
*mod
) { return; }
2786 EXPORT_SYMBOL(struct_module
);
2789 #ifdef CONFIG_MARKERS
2790 void module_update_markers(void)
2794 mutex_lock(&module_mutex
);
2795 list_for_each_entry(mod
, &modules
, list
)
2797 marker_update_probe_range(mod
->markers
,
2798 mod
->markers
+ mod
->num_markers
);
2799 mutex_unlock(&module_mutex
);
2803 #ifdef CONFIG_TRACEPOINTS
2804 void module_update_tracepoints(void)
2808 mutex_lock(&module_mutex
);
2809 list_for_each_entry(mod
, &modules
, list
)
2811 tracepoint_update_probe_range(mod
->tracepoints
,
2812 mod
->tracepoints
+ mod
->num_tracepoints
);
2813 mutex_unlock(&module_mutex
);
2817 * Returns 0 if current not found.
2818 * Returns 1 if current found.
2820 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
2822 struct module
*iter_mod
;
2825 mutex_lock(&module_mutex
);
2826 list_for_each_entry(iter_mod
, &modules
, list
) {
2827 if (!iter_mod
->taints
) {
2829 * Sorted module list
2831 if (iter_mod
< iter
->module
)
2833 else if (iter_mod
> iter
->module
)
2834 iter
->tracepoint
= NULL
;
2835 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
2836 iter_mod
->tracepoints
,
2837 iter_mod
->tracepoints
2838 + iter_mod
->num_tracepoints
);
2840 iter
->module
= iter_mod
;
2845 mutex_unlock(&module_mutex
);