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/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <linux/license.h>
51 #include <asm/sections.h>
52 #include <linux/tracepoint.h>
53 #include <linux/ftrace.h>
54 #include <linux/async.h>
55 #include <linux/percpu.h>
56 #include <linux/kmemleak.h>
61 #define DEBUGP(fmt , a...)
64 #ifndef ARCH_SHF_SMALL
65 #define ARCH_SHF_SMALL 0
68 /* If this is set, the section belongs in the init part of the module */
69 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
71 /* List of modules, protected by module_mutex or preempt_disable
72 * (delete uses stop_machine/add uses RCU list operations). */
73 DEFINE_MUTEX(module_mutex
);
74 EXPORT_SYMBOL_GPL(module_mutex
);
75 static LIST_HEAD(modules
);
77 /* Block module loading/unloading? */
78 int modules_disabled
= 0;
80 /* Waiting for a module to finish initializing? */
81 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
83 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
85 /* Bounds of module allocation, for speeding __module_address */
86 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
88 int register_module_notifier(struct notifier_block
* nb
)
90 return blocking_notifier_chain_register(&module_notify_list
, nb
);
92 EXPORT_SYMBOL(register_module_notifier
);
94 int unregister_module_notifier(struct notifier_block
* nb
)
96 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
98 EXPORT_SYMBOL(unregister_module_notifier
);
100 /* We require a truly strong try_module_get(): 0 means failure due to
101 ongoing or failed initialization etc. */
102 static inline int strong_try_module_get(struct module
*mod
)
104 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
106 if (try_module_get(mod
))
112 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
115 mod
->taints
|= (1U << flag
);
119 * A thread that wants to hold a reference to a module only while it
120 * is running can call this to safely exit. nfsd and lockd use this.
122 void __module_put_and_exit(struct module
*mod
, long code
)
127 EXPORT_SYMBOL(__module_put_and_exit
);
129 /* Find a module section: 0 means not found. */
130 static unsigned int find_sec(Elf_Ehdr
*hdr
,
132 const char *secstrings
,
137 for (i
= 1; i
< hdr
->e_shnum
; i
++)
138 /* Alloc bit cleared means "ignore it." */
139 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
140 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
145 /* Find a module section, or NULL. */
146 static void *section_addr(Elf_Ehdr
*hdr
, Elf_Shdr
*shdrs
,
147 const char *secstrings
, const char *name
)
149 /* Section 0 has sh_addr 0. */
150 return (void *)shdrs
[find_sec(hdr
, shdrs
, secstrings
, name
)].sh_addr
;
153 /* Find a module section, or NULL. Fill in number of "objects" in section. */
154 static void *section_objs(Elf_Ehdr
*hdr
,
156 const char *secstrings
,
161 unsigned int sec
= find_sec(hdr
, sechdrs
, secstrings
, name
);
163 /* Section 0 has sh_addr 0 and sh_size 0. */
164 *num
= sechdrs
[sec
].sh_size
/ object_size
;
165 return (void *)sechdrs
[sec
].sh_addr
;
168 /* Provided by the linker */
169 extern const struct kernel_symbol __start___ksymtab
[];
170 extern const struct kernel_symbol __stop___ksymtab
[];
171 extern const struct kernel_symbol __start___ksymtab_gpl
[];
172 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
173 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
174 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
175 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
176 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
177 extern const unsigned long __start___kcrctab
[];
178 extern const unsigned long __start___kcrctab_gpl
[];
179 extern const unsigned long __start___kcrctab_gpl_future
[];
180 #ifdef CONFIG_UNUSED_SYMBOLS
181 extern const struct kernel_symbol __start___ksymtab_unused
[];
182 extern const struct kernel_symbol __stop___ksymtab_unused
[];
183 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
184 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
185 extern const unsigned long __start___kcrctab_unused
[];
186 extern const unsigned long __start___kcrctab_unused_gpl
[];
189 #ifndef CONFIG_MODVERSIONS
190 #define symversion(base, idx) NULL
192 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
195 static bool each_symbol_in_section(const struct symsearch
*arr
,
196 unsigned int arrsize
,
197 struct module
*owner
,
198 bool (*fn
)(const struct symsearch
*syms
,
199 struct module
*owner
,
200 unsigned int symnum
, void *data
),
205 for (j
= 0; j
< arrsize
; j
++) {
206 for (i
= 0; i
< arr
[j
].stop
- arr
[j
].start
; i
++)
207 if (fn(&arr
[j
], owner
, i
, data
))
214 /* Returns true as soon as fn returns true, otherwise false. */
215 bool each_symbol(bool (*fn
)(const struct symsearch
*arr
, struct module
*owner
,
216 unsigned int symnum
, void *data
), void *data
)
219 const struct symsearch arr
[] = {
220 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
221 NOT_GPL_ONLY
, false },
222 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
223 __start___kcrctab_gpl
,
225 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
226 __start___kcrctab_gpl_future
,
227 WILL_BE_GPL_ONLY
, false },
228 #ifdef CONFIG_UNUSED_SYMBOLS
229 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
230 __start___kcrctab_unused
,
231 NOT_GPL_ONLY
, true },
232 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
233 __start___kcrctab_unused_gpl
,
238 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
241 list_for_each_entry_rcu(mod
, &modules
, list
) {
242 struct symsearch arr
[] = {
243 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
244 NOT_GPL_ONLY
, false },
245 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
248 { mod
->gpl_future_syms
,
249 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
250 mod
->gpl_future_crcs
,
251 WILL_BE_GPL_ONLY
, false },
252 #ifdef CONFIG_UNUSED_SYMBOLS
254 mod
->unused_syms
+ mod
->num_unused_syms
,
256 NOT_GPL_ONLY
, true },
257 { mod
->unused_gpl_syms
,
258 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
259 mod
->unused_gpl_crcs
,
264 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
269 EXPORT_SYMBOL_GPL(each_symbol
);
271 struct find_symbol_arg
{
278 struct module
*owner
;
279 const unsigned long *crc
;
280 const struct kernel_symbol
*sym
;
283 static bool find_symbol_in_section(const struct symsearch
*syms
,
284 struct module
*owner
,
285 unsigned int symnum
, void *data
)
287 struct find_symbol_arg
*fsa
= data
;
289 if (strcmp(syms
->start
[symnum
].name
, fsa
->name
) != 0)
293 if (syms
->licence
== GPL_ONLY
)
295 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
296 printk(KERN_WARNING
"Symbol %s is being used "
297 "by a non-GPL module, which will not "
298 "be allowed in the future\n", fsa
->name
);
299 printk(KERN_WARNING
"Please see the file "
300 "Documentation/feature-removal-schedule.txt "
301 "in the kernel source tree for more details.\n");
305 #ifdef CONFIG_UNUSED_SYMBOLS
306 if (syms
->unused
&& fsa
->warn
) {
307 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
308 "however this module is using it.\n", fsa
->name
);
310 "This symbol will go away in the future.\n");
312 "Please evalute if this is the right api to use and if "
313 "it really is, submit a report the linux kernel "
314 "mailinglist together with submitting your code for "
320 fsa
->crc
= symversion(syms
->crcs
, symnum
);
321 fsa
->sym
= &syms
->start
[symnum
];
325 /* Find a symbol and return it, along with, (optional) crc and
326 * (optional) module which owns it */
327 const struct kernel_symbol
*find_symbol(const char *name
,
328 struct module
**owner
,
329 const unsigned long **crc
,
333 struct find_symbol_arg fsa
;
339 if (each_symbol(find_symbol_in_section
, &fsa
)) {
347 DEBUGP("Failed to find symbol %s\n", name
);
350 EXPORT_SYMBOL_GPL(find_symbol
);
352 /* Search for module by name: must hold module_mutex. */
353 struct module
*find_module(const char *name
)
357 list_for_each_entry(mod
, &modules
, list
) {
358 if (strcmp(mod
->name
, name
) == 0)
363 EXPORT_SYMBOL_GPL(find_module
);
367 #ifdef CONFIG_HAVE_DYNAMIC_PER_CPU_AREA
369 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
374 if (align
> PAGE_SIZE
) {
375 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
376 name
, align
, PAGE_SIZE
);
380 ptr
= __alloc_reserved_percpu(size
, align
);
383 "Could not allocate %lu bytes percpu data\n", size
);
387 static void percpu_modfree(void *freeme
)
392 #else /* ... !CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
394 /* Number of blocks used and allocated. */
395 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
396 /* Size of each block. -ve means used. */
397 static int *pcpu_size
;
399 static int split_block(unsigned int i
, unsigned short size
)
401 /* Reallocation required? */
402 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
405 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
410 pcpu_num_allocated
*= 2;
414 /* Insert a new subblock */
415 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
416 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
419 pcpu_size
[i
+1] -= size
;
424 static inline unsigned int block_size(int val
)
431 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
439 if (align
> PAGE_SIZE
) {
440 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
441 name
, align
, PAGE_SIZE
);
445 ptr
= __per_cpu_start
;
446 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
447 /* Extra for alignment requirement. */
448 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
449 BUG_ON(i
== 0 && extra
!= 0);
451 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
454 /* Transfer extra to previous block. */
455 if (pcpu_size
[i
-1] < 0)
456 pcpu_size
[i
-1] -= extra
;
458 pcpu_size
[i
-1] += extra
;
459 pcpu_size
[i
] -= extra
;
462 /* Split block if warranted */
463 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
464 if (!split_block(i
, size
))
467 /* add the per-cpu scanning areas */
468 for_each_possible_cpu(cpu
)
469 kmemleak_alloc(ptr
+ per_cpu_offset(cpu
), size
, 0,
473 pcpu_size
[i
] = -pcpu_size
[i
];
477 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
482 static void percpu_modfree(void *freeme
)
485 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
488 /* First entry is core kernel percpu data. */
489 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
491 pcpu_size
[i
] = -pcpu_size
[i
];
498 /* remove the per-cpu scanning areas */
499 for_each_possible_cpu(cpu
)
500 kmemleak_free(freeme
+ per_cpu_offset(cpu
));
502 /* Merge with previous? */
503 if (pcpu_size
[i
-1] >= 0) {
504 pcpu_size
[i
-1] += pcpu_size
[i
];
506 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
507 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
510 /* Merge with next? */
511 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
512 pcpu_size
[i
] += pcpu_size
[i
+1];
514 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
515 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
519 static int percpu_modinit(void)
522 pcpu_num_allocated
= 2;
523 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
525 /* Static in-kernel percpu data (used). */
526 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
528 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
529 if (pcpu_size
[1] < 0) {
530 printk(KERN_ERR
"No per-cpu room for modules.\n");
536 __initcall(percpu_modinit
);
538 #endif /* CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
540 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
542 const char *secstrings
)
544 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
547 static void percpu_modcopy(void *pcpudest
, const void *from
, unsigned long size
)
551 for_each_possible_cpu(cpu
)
552 memcpy(pcpudest
+ per_cpu_offset(cpu
), from
, size
);
555 #else /* ... !CONFIG_SMP */
557 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
562 static inline void percpu_modfree(void *pcpuptr
)
566 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
568 const char *secstrings
)
572 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
575 /* pcpusec should be 0, and size of that section should be 0. */
579 #endif /* CONFIG_SMP */
581 #define MODINFO_ATTR(field) \
582 static void setup_modinfo_##field(struct module *mod, const char *s) \
584 mod->field = kstrdup(s, GFP_KERNEL); \
586 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
587 struct module *mod, char *buffer) \
589 return sprintf(buffer, "%s\n", mod->field); \
591 static int modinfo_##field##_exists(struct module *mod) \
593 return mod->field != NULL; \
595 static void free_modinfo_##field(struct module *mod) \
600 static struct module_attribute modinfo_##field = { \
601 .attr = { .name = __stringify(field), .mode = 0444 }, \
602 .show = show_modinfo_##field, \
603 .setup = setup_modinfo_##field, \
604 .test = modinfo_##field##_exists, \
605 .free = free_modinfo_##field, \
608 MODINFO_ATTR(version
);
609 MODINFO_ATTR(srcversion
);
611 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
613 #ifdef CONFIG_MODULE_UNLOAD
614 /* Init the unload section of the module. */
615 static void module_unload_init(struct module
*mod
)
619 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
620 for_each_possible_cpu(cpu
)
621 local_set(__module_ref_addr(mod
, cpu
), 0);
622 /* Hold reference count during initialization. */
623 local_set(__module_ref_addr(mod
, raw_smp_processor_id()), 1);
624 /* Backwards compatibility macros put refcount during init. */
625 mod
->waiter
= current
;
628 /* modules using other modules */
631 struct list_head list
;
632 struct module
*module_which_uses
;
635 /* Does a already use b? */
636 static int already_uses(struct module
*a
, struct module
*b
)
638 struct module_use
*use
;
640 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
641 if (use
->module_which_uses
== a
) {
642 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
646 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
650 /* Module a uses b */
651 int use_module(struct module
*a
, struct module
*b
)
653 struct module_use
*use
;
656 if (b
== NULL
|| already_uses(a
, b
)) return 1;
658 /* If we're interrupted or time out, we fail. */
659 if (wait_event_interruptible_timeout(
660 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
662 printk("%s: gave up waiting for init of module %s.\n",
667 /* If strong_try_module_get() returned a different error, we fail. */
671 DEBUGP("Allocating new usage for %s.\n", a
->name
);
672 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
674 printk("%s: out of memory loading\n", a
->name
);
679 use
->module_which_uses
= a
;
680 list_add(&use
->list
, &b
->modules_which_use_me
);
681 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
684 EXPORT_SYMBOL_GPL(use_module
);
686 /* Clear the unload stuff of the module. */
687 static void module_unload_free(struct module
*mod
)
691 list_for_each_entry(i
, &modules
, list
) {
692 struct module_use
*use
;
694 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
695 if (use
->module_which_uses
== mod
) {
696 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
698 list_del(&use
->list
);
700 sysfs_remove_link(i
->holders_dir
, mod
->name
);
701 /* There can be at most one match. */
708 #ifdef CONFIG_MODULE_FORCE_UNLOAD
709 static inline int try_force_unload(unsigned int flags
)
711 int ret
= (flags
& O_TRUNC
);
713 add_taint(TAINT_FORCED_RMMOD
);
717 static inline int try_force_unload(unsigned int flags
)
721 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
730 /* Whole machine is stopped with interrupts off when this runs. */
731 static int __try_stop_module(void *_sref
)
733 struct stopref
*sref
= _sref
;
735 /* If it's not unused, quit unless we're forcing. */
736 if (module_refcount(sref
->mod
) != 0) {
737 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
741 /* Mark it as dying. */
742 sref
->mod
->state
= MODULE_STATE_GOING
;
746 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
748 if (flags
& O_NONBLOCK
) {
749 struct stopref sref
= { mod
, flags
, forced
};
751 return stop_machine(__try_stop_module
, &sref
, NULL
);
753 /* We don't need to stop the machine for this. */
754 mod
->state
= MODULE_STATE_GOING
;
760 unsigned int module_refcount(struct module
*mod
)
762 unsigned int total
= 0;
765 for_each_possible_cpu(cpu
)
766 total
+= local_read(__module_ref_addr(mod
, cpu
));
769 EXPORT_SYMBOL(module_refcount
);
771 /* This exists whether we can unload or not */
772 static void free_module(struct module
*mod
);
774 static void wait_for_zero_refcount(struct module
*mod
)
776 /* Since we might sleep for some time, release the mutex first */
777 mutex_unlock(&module_mutex
);
779 DEBUGP("Looking at refcount...\n");
780 set_current_state(TASK_UNINTERRUPTIBLE
);
781 if (module_refcount(mod
) == 0)
785 current
->state
= TASK_RUNNING
;
786 mutex_lock(&module_mutex
);
789 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
793 char name
[MODULE_NAME_LEN
];
796 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
799 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
801 name
[MODULE_NAME_LEN
-1] = '\0';
803 /* Create stop_machine threads since free_module relies on
804 * a non-failing stop_machine call. */
805 ret
= stop_machine_create();
809 if (mutex_lock_interruptible(&module_mutex
) != 0) {
814 mod
= find_module(name
);
820 if (!list_empty(&mod
->modules_which_use_me
)) {
821 /* Other modules depend on us: get rid of them first. */
826 /* Doing init or already dying? */
827 if (mod
->state
!= MODULE_STATE_LIVE
) {
828 /* FIXME: if (force), slam module count and wake up
830 DEBUGP("%s already dying\n", mod
->name
);
835 /* If it has an init func, it must have an exit func to unload */
836 if (mod
->init
&& !mod
->exit
) {
837 forced
= try_force_unload(flags
);
839 /* This module can't be removed */
845 /* Set this up before setting mod->state */
846 mod
->waiter
= current
;
848 /* Stop the machine so refcounts can't move and disable module. */
849 ret
= try_stop_module(mod
, flags
, &forced
);
853 /* Never wait if forced. */
854 if (!forced
&& module_refcount(mod
) != 0)
855 wait_for_zero_refcount(mod
);
857 mutex_unlock(&module_mutex
);
858 /* Final destruction now noone is using it. */
859 if (mod
->exit
!= NULL
)
861 blocking_notifier_call_chain(&module_notify_list
,
862 MODULE_STATE_GOING
, mod
);
863 async_synchronize_full();
864 mutex_lock(&module_mutex
);
865 /* Store the name of the last unloaded module for diagnostic purposes */
866 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
867 ddebug_remove_module(mod
->name
);
871 mutex_unlock(&module_mutex
);
873 stop_machine_destroy();
877 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
879 struct module_use
*use
;
880 int printed_something
= 0;
882 seq_printf(m
, " %u ", module_refcount(mod
));
884 /* Always include a trailing , so userspace can differentiate
885 between this and the old multi-field proc format. */
886 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
887 printed_something
= 1;
888 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
891 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
892 printed_something
= 1;
893 seq_printf(m
, "[permanent],");
896 if (!printed_something
)
900 void __symbol_put(const char *symbol
)
902 struct module
*owner
;
905 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
910 EXPORT_SYMBOL(__symbol_put
);
912 /* Note this assumes addr is a function, which it currently always is. */
913 void symbol_put_addr(void *addr
)
915 struct module
*modaddr
;
916 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
918 if (core_kernel_text(a
))
921 /* module_text_address is safe here: we're supposed to have reference
922 * to module from symbol_get, so it can't go away. */
923 modaddr
= __module_text_address(a
);
927 EXPORT_SYMBOL_GPL(symbol_put_addr
);
929 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
930 struct module
*mod
, char *buffer
)
932 return sprintf(buffer
, "%u\n", module_refcount(mod
));
935 static struct module_attribute refcnt
= {
936 .attr
= { .name
= "refcnt", .mode
= 0444 },
940 void module_put(struct module
*module
)
943 unsigned int cpu
= get_cpu();
944 local_dec(__module_ref_addr(module
, cpu
));
945 /* Maybe they're waiting for us to drop reference? */
946 if (unlikely(!module_is_live(module
)))
947 wake_up_process(module
->waiter
);
951 EXPORT_SYMBOL(module_put
);
953 #else /* !CONFIG_MODULE_UNLOAD */
954 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
956 /* We don't know the usage count, or what modules are using. */
957 seq_printf(m
, " - -");
960 static inline void module_unload_free(struct module
*mod
)
964 int use_module(struct module
*a
, struct module
*b
)
966 return strong_try_module_get(b
) == 0;
968 EXPORT_SYMBOL_GPL(use_module
);
970 static inline void module_unload_init(struct module
*mod
)
973 #endif /* CONFIG_MODULE_UNLOAD */
975 static ssize_t
show_initstate(struct module_attribute
*mattr
,
976 struct module
*mod
, char *buffer
)
978 const char *state
= "unknown";
980 switch (mod
->state
) {
981 case MODULE_STATE_LIVE
:
984 case MODULE_STATE_COMING
:
987 case MODULE_STATE_GOING
:
991 return sprintf(buffer
, "%s\n", state
);
994 static struct module_attribute initstate
= {
995 .attr
= { .name
= "initstate", .mode
= 0444 },
996 .show
= show_initstate
,
999 static struct module_attribute
*modinfo_attrs
[] = {
1001 &modinfo_srcversion
,
1003 #ifdef CONFIG_MODULE_UNLOAD
1009 static const char vermagic
[] = VERMAGIC_STRING
;
1011 static int try_to_force_load(struct module
*mod
, const char *reason
)
1013 #ifdef CONFIG_MODULE_FORCE_LOAD
1014 if (!test_taint(TAINT_FORCED_MODULE
))
1015 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
1017 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1024 #ifdef CONFIG_MODVERSIONS
1025 static int check_version(Elf_Shdr
*sechdrs
,
1026 unsigned int versindex
,
1027 const char *symname
,
1029 const unsigned long *crc
)
1031 unsigned int i
, num_versions
;
1032 struct modversion_info
*versions
;
1034 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1038 /* No versions at all? modprobe --force does this. */
1040 return try_to_force_load(mod
, symname
) == 0;
1042 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1043 num_versions
= sechdrs
[versindex
].sh_size
1044 / sizeof(struct modversion_info
);
1046 for (i
= 0; i
< num_versions
; i
++) {
1047 if (strcmp(versions
[i
].name
, symname
) != 0)
1050 if (versions
[i
].crc
== *crc
)
1052 DEBUGP("Found checksum %lX vs module %lX\n",
1053 *crc
, versions
[i
].crc
);
1057 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1058 mod
->name
, symname
);
1062 printk("%s: disagrees about version of symbol %s\n",
1063 mod
->name
, symname
);
1067 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1068 unsigned int versindex
,
1071 const unsigned long *crc
;
1073 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1076 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
);
1079 /* First part is kernel version, which we ignore if module has crcs. */
1080 static inline int same_magic(const char *amagic
, const char *bmagic
,
1084 amagic
+= strcspn(amagic
, " ");
1085 bmagic
+= strcspn(bmagic
, " ");
1087 return strcmp(amagic
, bmagic
) == 0;
1090 static inline int check_version(Elf_Shdr
*sechdrs
,
1091 unsigned int versindex
,
1092 const char *symname
,
1094 const unsigned long *crc
)
1099 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1100 unsigned int versindex
,
1106 static inline int same_magic(const char *amagic
, const char *bmagic
,
1109 return strcmp(amagic
, bmagic
) == 0;
1111 #endif /* CONFIG_MODVERSIONS */
1113 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1114 Must be holding module_mutex. */
1115 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1116 unsigned int versindex
,
1120 struct module
*owner
;
1121 const struct kernel_symbol
*sym
;
1122 const unsigned long *crc
;
1124 sym
= find_symbol(name
, &owner
, &crc
,
1125 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1126 /* use_module can fail due to OOM,
1127 or module initialization or unloading */
1129 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
1130 !use_module(mod
, owner
))
1137 * /sys/module/foo/sections stuff
1138 * J. Corbet <corbet@lwn.net>
1140 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1141 struct module_sect_attr
1143 struct module_attribute mattr
;
1145 unsigned long address
;
1148 struct module_sect_attrs
1150 struct attribute_group grp
;
1151 unsigned int nsections
;
1152 struct module_sect_attr attrs
[0];
1155 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1156 struct module
*mod
, char *buf
)
1158 struct module_sect_attr
*sattr
=
1159 container_of(mattr
, struct module_sect_attr
, mattr
);
1160 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1163 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1165 unsigned int section
;
1167 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1168 kfree(sect_attrs
->attrs
[section
].name
);
1172 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1173 char *secstrings
, Elf_Shdr
*sechdrs
)
1175 unsigned int nloaded
= 0, i
, size
[2];
1176 struct module_sect_attrs
*sect_attrs
;
1177 struct module_sect_attr
*sattr
;
1178 struct attribute
**gattr
;
1180 /* Count loaded sections and allocate structures */
1181 for (i
= 0; i
< nsect
; i
++)
1182 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1184 size
[0] = ALIGN(sizeof(*sect_attrs
)
1185 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1186 sizeof(sect_attrs
->grp
.attrs
[0]));
1187 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1188 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1189 if (sect_attrs
== NULL
)
1192 /* Setup section attributes. */
1193 sect_attrs
->grp
.name
= "sections";
1194 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1196 sect_attrs
->nsections
= 0;
1197 sattr
= §_attrs
->attrs
[0];
1198 gattr
= §_attrs
->grp
.attrs
[0];
1199 for (i
= 0; i
< nsect
; i
++) {
1200 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1202 sattr
->address
= sechdrs
[i
].sh_addr
;
1203 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1205 if (sattr
->name
== NULL
)
1207 sect_attrs
->nsections
++;
1208 sattr
->mattr
.show
= module_sect_show
;
1209 sattr
->mattr
.store
= NULL
;
1210 sattr
->mattr
.attr
.name
= sattr
->name
;
1211 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1212 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1216 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1219 mod
->sect_attrs
= sect_attrs
;
1222 free_sect_attrs(sect_attrs
);
1225 static void remove_sect_attrs(struct module
*mod
)
1227 if (mod
->sect_attrs
) {
1228 sysfs_remove_group(&mod
->mkobj
.kobj
,
1229 &mod
->sect_attrs
->grp
);
1230 /* We are positive that no one is using any sect attrs
1231 * at this point. Deallocate immediately. */
1232 free_sect_attrs(mod
->sect_attrs
);
1233 mod
->sect_attrs
= NULL
;
1238 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1241 struct module_notes_attrs
{
1242 struct kobject
*dir
;
1244 struct bin_attribute attrs
[0];
1247 static ssize_t
module_notes_read(struct kobject
*kobj
,
1248 struct bin_attribute
*bin_attr
,
1249 char *buf
, loff_t pos
, size_t count
)
1252 * The caller checked the pos and count against our size.
1254 memcpy(buf
, bin_attr
->private + pos
, count
);
1258 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1261 if (notes_attrs
->dir
) {
1263 sysfs_remove_bin_file(notes_attrs
->dir
,
1264 ¬es_attrs
->attrs
[i
]);
1265 kobject_put(notes_attrs
->dir
);
1270 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1271 char *secstrings
, Elf_Shdr
*sechdrs
)
1273 unsigned int notes
, loaded
, i
;
1274 struct module_notes_attrs
*notes_attrs
;
1275 struct bin_attribute
*nattr
;
1277 /* Count notes sections and allocate structures. */
1279 for (i
= 0; i
< nsect
; i
++)
1280 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1281 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1287 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1288 + notes
* sizeof(notes_attrs
->attrs
[0]),
1290 if (notes_attrs
== NULL
)
1293 notes_attrs
->notes
= notes
;
1294 nattr
= ¬es_attrs
->attrs
[0];
1295 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1296 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1298 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1299 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1300 nattr
->attr
.mode
= S_IRUGO
;
1301 nattr
->size
= sechdrs
[i
].sh_size
;
1302 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1303 nattr
->read
= module_notes_read
;
1309 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1310 if (!notes_attrs
->dir
)
1313 for (i
= 0; i
< notes
; ++i
)
1314 if (sysfs_create_bin_file(notes_attrs
->dir
,
1315 ¬es_attrs
->attrs
[i
]))
1318 mod
->notes_attrs
= notes_attrs
;
1322 free_notes_attrs(notes_attrs
, i
);
1325 static void remove_notes_attrs(struct module
*mod
)
1327 if (mod
->notes_attrs
)
1328 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1333 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1334 char *sectstrings
, Elf_Shdr
*sechdrs
)
1338 static inline void remove_sect_attrs(struct module
*mod
)
1342 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1343 char *sectstrings
, Elf_Shdr
*sechdrs
)
1347 static inline void remove_notes_attrs(struct module
*mod
)
1353 int module_add_modinfo_attrs(struct module
*mod
)
1355 struct module_attribute
*attr
;
1356 struct module_attribute
*temp_attr
;
1360 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1361 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1363 if (!mod
->modinfo_attrs
)
1366 temp_attr
= mod
->modinfo_attrs
;
1367 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1369 (attr
->test
&& attr
->test(mod
))) {
1370 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1371 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1378 void module_remove_modinfo_attrs(struct module
*mod
)
1380 struct module_attribute
*attr
;
1383 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1384 /* pick a field to test for end of list */
1385 if (!attr
->attr
.name
)
1387 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1391 kfree(mod
->modinfo_attrs
);
1394 int mod_sysfs_init(struct module
*mod
)
1397 struct kobject
*kobj
;
1399 if (!module_sysfs_initialized
) {
1400 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1406 kobj
= kset_find_obj(module_kset
, mod
->name
);
1408 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1414 mod
->mkobj
.mod
= mod
;
1416 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1417 mod
->mkobj
.kobj
.kset
= module_kset
;
1418 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1421 kobject_put(&mod
->mkobj
.kobj
);
1423 /* delay uevent until full sysfs population */
1428 int mod_sysfs_setup(struct module
*mod
,
1429 struct kernel_param
*kparam
,
1430 unsigned int num_params
)
1434 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1435 if (!mod
->holders_dir
) {
1440 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1442 goto out_unreg_holders
;
1444 err
= module_add_modinfo_attrs(mod
);
1446 goto out_unreg_param
;
1448 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1452 module_param_sysfs_remove(mod
);
1454 kobject_put(mod
->holders_dir
);
1456 kobject_put(&mod
->mkobj
.kobj
);
1460 static void mod_sysfs_fini(struct module
*mod
)
1462 kobject_put(&mod
->mkobj
.kobj
);
1465 #else /* CONFIG_SYSFS */
1467 static void mod_sysfs_fini(struct module
*mod
)
1471 #endif /* CONFIG_SYSFS */
1473 static void mod_kobject_remove(struct module
*mod
)
1475 module_remove_modinfo_attrs(mod
);
1476 module_param_sysfs_remove(mod
);
1477 kobject_put(mod
->mkobj
.drivers_dir
);
1478 kobject_put(mod
->holders_dir
);
1479 mod_sysfs_fini(mod
);
1483 * unlink the module with the whole machine is stopped with interrupts off
1484 * - this defends against kallsyms not taking locks
1486 static int __unlink_module(void *_mod
)
1488 struct module
*mod
= _mod
;
1489 list_del(&mod
->list
);
1493 /* Free a module, remove from lists, etc (must hold module_mutex). */
1494 static void free_module(struct module
*mod
)
1496 /* Delete from various lists */
1497 stop_machine(__unlink_module
, mod
, NULL
);
1498 remove_notes_attrs(mod
);
1499 remove_sect_attrs(mod
);
1500 mod_kobject_remove(mod
);
1502 /* Arch-specific cleanup. */
1503 module_arch_cleanup(mod
);
1505 /* Module unload stuff */
1506 module_unload_free(mod
);
1508 /* Free any allocated parameters. */
1509 destroy_params(mod
->kp
, mod
->num_kp
);
1511 /* This may be NULL, but that's OK */
1512 module_free(mod
, mod
->module_init
);
1515 percpu_modfree(mod
->percpu
);
1516 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1518 percpu_modfree(mod
->refptr
);
1520 /* Free lock-classes: */
1521 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1523 /* Finally, free the core (containing the module structure) */
1524 module_free(mod
, mod
->module_core
);
1527 void *__symbol_get(const char *symbol
)
1529 struct module
*owner
;
1530 const struct kernel_symbol
*sym
;
1533 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1534 if (sym
&& strong_try_module_get(owner
))
1538 return sym
? (void *)sym
->value
: NULL
;
1540 EXPORT_SYMBOL_GPL(__symbol_get
);
1543 * Ensure that an exported symbol [global namespace] does not already exist
1544 * in the kernel or in some other module's exported symbol table.
1546 static int verify_export_symbols(struct module
*mod
)
1549 struct module
*owner
;
1550 const struct kernel_symbol
*s
;
1552 const struct kernel_symbol
*sym
;
1555 { mod
->syms
, mod
->num_syms
},
1556 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1557 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1558 #ifdef CONFIG_UNUSED_SYMBOLS
1559 { mod
->unused_syms
, mod
->num_unused_syms
},
1560 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1564 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1565 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1566 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1568 "%s: exports duplicate symbol %s"
1570 mod
->name
, s
->name
, module_name(owner
));
1578 /* Change all symbols so that st_value encodes the pointer directly. */
1579 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1580 unsigned int symindex
,
1582 unsigned int versindex
,
1583 unsigned int pcpuindex
,
1586 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1587 unsigned long secbase
;
1588 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1590 const struct kernel_symbol
*ksym
;
1592 for (i
= 1; i
< n
; i
++) {
1593 switch (sym
[i
].st_shndx
) {
1595 /* We compiled with -fno-common. These are not
1596 supposed to happen. */
1597 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1598 printk("%s: please compile with -fno-common\n",
1604 /* Don't need to do anything */
1605 DEBUGP("Absolute symbol: 0x%08lx\n",
1606 (long)sym
[i
].st_value
);
1610 ksym
= resolve_symbol(sechdrs
, versindex
,
1611 strtab
+ sym
[i
].st_name
, mod
);
1612 /* Ok if resolved. */
1614 sym
[i
].st_value
= ksym
->value
;
1619 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1622 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1623 mod
->name
, strtab
+ sym
[i
].st_name
);
1628 /* Divert to percpu allocation if a percpu var. */
1629 if (sym
[i
].st_shndx
== pcpuindex
)
1630 secbase
= (unsigned long)mod
->percpu
;
1632 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1633 sym
[i
].st_value
+= secbase
;
1641 /* Additional bytes needed by arch in front of individual sections */
1642 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1643 unsigned int section
)
1645 /* default implementation just returns zero */
1649 /* Update size with this section: return offset. */
1650 static long get_offset(struct module
*mod
, unsigned int *size
,
1651 Elf_Shdr
*sechdr
, unsigned int section
)
1655 *size
+= arch_mod_section_prepend(mod
, section
);
1656 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1657 *size
= ret
+ sechdr
->sh_size
;
1661 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1662 might -- code, read-only data, read-write data, small data. Tally
1663 sizes, and place the offsets into sh_entsize fields: high bit means it
1665 static void layout_sections(struct module
*mod
,
1666 const Elf_Ehdr
*hdr
,
1668 const char *secstrings
)
1670 static unsigned long const masks
[][2] = {
1671 /* NOTE: all executable code must be the first section
1672 * in this array; otherwise modify the text_size
1673 * finder in the two loops below */
1674 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1675 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1676 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1677 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1681 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1682 sechdrs
[i
].sh_entsize
= ~0UL;
1684 DEBUGP("Core section allocation order:\n");
1685 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1686 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1687 Elf_Shdr
*s
= &sechdrs
[i
];
1689 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1690 || (s
->sh_flags
& masks
[m
][1])
1691 || s
->sh_entsize
!= ~0UL
1692 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1694 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1695 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1698 mod
->core_text_size
= mod
->core_size
;
1701 DEBUGP("Init section allocation order:\n");
1702 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1703 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1704 Elf_Shdr
*s
= &sechdrs
[i
];
1706 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1707 || (s
->sh_flags
& masks
[m
][1])
1708 || s
->sh_entsize
!= ~0UL
1709 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1711 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1712 | INIT_OFFSET_MASK
);
1713 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1716 mod
->init_text_size
= mod
->init_size
;
1720 static void set_license(struct module
*mod
, const char *license
)
1723 license
= "unspecified";
1725 if (!license_is_gpl_compatible(license
)) {
1726 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1727 printk(KERN_WARNING
"%s: module license '%s' taints "
1728 "kernel.\n", mod
->name
, license
);
1729 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1733 /* Parse tag=value strings from .modinfo section */
1734 static char *next_string(char *string
, unsigned long *secsize
)
1736 /* Skip non-zero chars */
1739 if ((*secsize
)-- <= 1)
1743 /* Skip any zero padding. */
1744 while (!string
[0]) {
1746 if ((*secsize
)-- <= 1)
1752 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1757 unsigned int taglen
= strlen(tag
);
1758 unsigned long size
= sechdrs
[info
].sh_size
;
1760 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1761 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1762 return p
+ taglen
+ 1;
1767 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1768 unsigned int infoindex
)
1770 struct module_attribute
*attr
;
1773 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1776 get_modinfo(sechdrs
,
1782 #ifdef CONFIG_KALLSYMS
1784 /* lookup symbol in given range of kernel_symbols */
1785 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1786 const struct kernel_symbol
*start
,
1787 const struct kernel_symbol
*stop
)
1789 const struct kernel_symbol
*ks
= start
;
1790 for (; ks
< stop
; ks
++)
1791 if (strcmp(ks
->name
, name
) == 0)
1796 static int is_exported(const char *name
, unsigned long value
,
1797 const struct module
*mod
)
1799 const struct kernel_symbol
*ks
;
1801 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1803 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1804 return ks
!= NULL
&& ks
->value
== value
;
1808 static char elf_type(const Elf_Sym
*sym
,
1810 const char *secstrings
,
1813 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1814 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1819 if (sym
->st_shndx
== SHN_UNDEF
)
1821 if (sym
->st_shndx
== SHN_ABS
)
1823 if (sym
->st_shndx
>= SHN_LORESERVE
)
1825 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1827 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1828 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1829 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1831 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1836 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1837 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1842 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1847 static void add_kallsyms(struct module
*mod
,
1849 unsigned int symindex
,
1850 unsigned int strindex
,
1851 const char *secstrings
)
1855 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1856 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1857 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1859 /* Set types up while we still have access to sections. */
1860 for (i
= 0; i
< mod
->num_symtab
; i
++)
1861 mod
->symtab
[i
].st_info
1862 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1865 static inline void add_kallsyms(struct module
*mod
,
1867 unsigned int symindex
,
1868 unsigned int strindex
,
1869 const char *secstrings
)
1872 #endif /* CONFIG_KALLSYMS */
1874 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
1876 #ifdef CONFIG_DYNAMIC_DEBUG
1877 if (ddebug_add_module(debug
, num
, debug
->modname
))
1878 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
1883 static void *module_alloc_update_bounds(unsigned long size
)
1885 void *ret
= module_alloc(size
);
1888 /* Update module bounds. */
1889 if ((unsigned long)ret
< module_addr_min
)
1890 module_addr_min
= (unsigned long)ret
;
1891 if ((unsigned long)ret
+ size
> module_addr_max
)
1892 module_addr_max
= (unsigned long)ret
+ size
;
1897 #ifdef CONFIG_DEBUG_KMEMLEAK
1898 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1899 Elf_Shdr
*sechdrs
, char *secstrings
)
1903 /* only scan the sections containing data */
1904 kmemleak_scan_area(mod
->module_core
, (unsigned long)mod
-
1905 (unsigned long)mod
->module_core
,
1906 sizeof(struct module
), GFP_KERNEL
);
1908 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1909 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1911 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
1912 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
1915 kmemleak_scan_area(mod
->module_core
, sechdrs
[i
].sh_addr
-
1916 (unsigned long)mod
->module_core
,
1917 sechdrs
[i
].sh_size
, GFP_KERNEL
);
1921 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1922 Elf_Shdr
*sechdrs
, char *secstrings
)
1927 /* Allocate and load the module: note that size of section 0 is always
1928 zero, and we rely on this for optional sections. */
1929 static noinline
struct module
*load_module(void __user
*umod
,
1931 const char __user
*uargs
)
1935 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1938 unsigned int symindex
= 0;
1939 unsigned int strindex
= 0;
1940 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
1943 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1944 mm_segment_t old_fs
;
1946 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1948 if (len
< sizeof(*hdr
))
1949 return ERR_PTR(-ENOEXEC
);
1951 /* Suck in entire file: we'll want most of it. */
1952 /* vmalloc barfs on "unusual" numbers. Check here */
1953 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1954 return ERR_PTR(-ENOMEM
);
1956 if (copy_from_user(hdr
, umod
, len
) != 0) {
1961 /* Sanity checks against insmoding binaries or wrong arch,
1962 weird elf version */
1963 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
1964 || hdr
->e_type
!= ET_REL
1965 || !elf_check_arch(hdr
)
1966 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1971 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1974 /* Convenience variables */
1975 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1976 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1977 sechdrs
[0].sh_addr
= 0;
1979 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1980 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1981 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1984 /* Mark all sections sh_addr with their address in the
1986 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1988 /* Internal symbols and strings. */
1989 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1991 strindex
= sechdrs
[i
].sh_link
;
1992 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1994 #ifndef CONFIG_MODULE_UNLOAD
1995 /* Don't load .exit sections */
1996 if (strstarts(secstrings
+sechdrs
[i
].sh_name
, ".exit"))
1997 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2001 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
2002 ".gnu.linkonce.this_module");
2004 printk(KERN_WARNING
"No module found in object\n");
2008 /* This is temporary: point mod into copy of data. */
2009 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2011 if (symindex
== 0) {
2012 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2018 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
2019 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
2020 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
2022 /* Don't keep modinfo and version sections. */
2023 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2024 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2025 #ifdef CONFIG_KALLSYMS
2026 /* Keep symbol and string tables for decoding later. */
2027 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
2028 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
2031 /* Check module struct version now, before we try to use module. */
2032 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
2037 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2038 /* This is allowed: modprobe --force will invalidate it. */
2040 err
= try_to_force_load(mod
, "bad vermagic");
2043 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2044 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2045 mod
->name
, modmagic
, vermagic
);
2050 staging
= get_modinfo(sechdrs
, infoindex
, "staging");
2052 add_taint_module(mod
, TAINT_CRAP
);
2053 printk(KERN_WARNING
"%s: module is from the staging directory,"
2054 " the quality is unknown, you have been warned.\n",
2058 /* Now copy in args */
2059 args
= strndup_user(uargs
, ~0UL >> 1);
2061 err
= PTR_ERR(args
);
2065 if (find_module(mod
->name
)) {
2070 mod
->state
= MODULE_STATE_COMING
;
2072 /* Allow arches to frob section contents and sizes. */
2073 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2078 /* We have a special allocation for this section. */
2079 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
2080 sechdrs
[pcpuindex
].sh_addralign
,
2086 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2087 mod
->percpu
= percpu
;
2090 /* Determine total sizes, and put offsets in sh_entsize. For now
2091 this is done generically; there doesn't appear to be any
2092 special cases for the architectures. */
2093 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2095 /* Do the allocs. */
2096 ptr
= module_alloc_update_bounds(mod
->core_size
);
2098 * The pointer to this block is stored in the module structure
2099 * which is inside the block. Just mark it as not being a
2102 kmemleak_not_leak(ptr
);
2107 memset(ptr
, 0, mod
->core_size
);
2108 mod
->module_core
= ptr
;
2110 ptr
= module_alloc_update_bounds(mod
->init_size
);
2112 * The pointer to this block is stored in the module structure
2113 * which is inside the block. This block doesn't need to be
2114 * scanned as it contains data and code that will be freed
2115 * after the module is initialized.
2117 kmemleak_ignore(ptr
);
2118 if (!ptr
&& mod
->init_size
) {
2122 memset(ptr
, 0, mod
->init_size
);
2123 mod
->module_init
= ptr
;
2125 /* Transfer each section which specifies SHF_ALLOC */
2126 DEBUGP("final section addresses:\n");
2127 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2130 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2133 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2134 dest
= mod
->module_init
2135 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2137 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2139 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2140 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2141 sechdrs
[i
].sh_size
);
2142 /* Update sh_addr to point to copy in image. */
2143 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2144 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2146 /* Module has been moved. */
2147 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2148 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2150 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2151 mod
->refptr
= percpu_modalloc(sizeof(local_t
), __alignof__(local_t
),
2158 /* Now we've moved module, initialize linked lists, etc. */
2159 module_unload_init(mod
);
2161 /* add kobject, so we can reference it. */
2162 err
= mod_sysfs_init(mod
);
2166 /* Set up license info based on the info section */
2167 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2170 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2171 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2172 * using GPL-only symbols it needs.
2174 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2175 add_taint(TAINT_PROPRIETARY_MODULE
);
2177 /* driverloader was caught wrongly pretending to be under GPL */
2178 if (strcmp(mod
->name
, "driverloader") == 0)
2179 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2181 /* Set up MODINFO_ATTR fields */
2182 setup_modinfo(mod
, sechdrs
, infoindex
);
2184 /* Fix up syms, so that st_value is a pointer to location. */
2185 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2190 /* Now we've got everything in the final locations, we can
2191 * find optional sections. */
2192 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2193 sizeof(*mod
->kp
), &mod
->num_kp
);
2194 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2195 sizeof(*mod
->syms
), &mod
->num_syms
);
2196 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2197 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2198 sizeof(*mod
->gpl_syms
),
2199 &mod
->num_gpl_syms
);
2200 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2201 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2202 "__ksymtab_gpl_future",
2203 sizeof(*mod
->gpl_future_syms
),
2204 &mod
->num_gpl_future_syms
);
2205 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2206 "__kcrctab_gpl_future");
2208 #ifdef CONFIG_UNUSED_SYMBOLS
2209 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2211 sizeof(*mod
->unused_syms
),
2212 &mod
->num_unused_syms
);
2213 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2214 "__kcrctab_unused");
2215 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2216 "__ksymtab_unused_gpl",
2217 sizeof(*mod
->unused_gpl_syms
),
2218 &mod
->num_unused_gpl_syms
);
2219 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2220 "__kcrctab_unused_gpl");
2222 #ifdef CONFIG_CONSTRUCTORS
2223 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2224 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2227 #ifdef CONFIG_MARKERS
2228 mod
->markers
= section_objs(hdr
, sechdrs
, secstrings
, "__markers",
2229 sizeof(*mod
->markers
), &mod
->num_markers
);
2231 #ifdef CONFIG_TRACEPOINTS
2232 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2234 sizeof(*mod
->tracepoints
),
2235 &mod
->num_tracepoints
);
2237 #ifdef CONFIG_EVENT_TRACING
2238 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2240 sizeof(*mod
->trace_events
),
2241 &mod
->num_trace_events
);
2243 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2244 /* sechdrs[0].sh_size is always zero */
2245 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2247 sizeof(*mod
->ftrace_callsites
),
2248 &mod
->num_ftrace_callsites
);
2250 #ifdef CONFIG_MODVERSIONS
2251 if ((mod
->num_syms
&& !mod
->crcs
)
2252 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2253 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2254 #ifdef CONFIG_UNUSED_SYMBOLS
2255 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2256 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2259 err
= try_to_force_load(mod
,
2260 "no versions for exported symbols");
2266 /* Now do relocations. */
2267 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2268 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2269 unsigned int info
= sechdrs
[i
].sh_info
;
2271 /* Not a valid relocation section? */
2272 if (info
>= hdr
->e_shnum
)
2275 /* Don't bother with non-allocated sections */
2276 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2279 if (sechdrs
[i
].sh_type
== SHT_REL
)
2280 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2281 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2282 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2288 /* Find duplicate symbols */
2289 err
= verify_export_symbols(mod
);
2293 /* Set up and sort exception table */
2294 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2295 sizeof(*mod
->extable
), &mod
->num_exentries
);
2296 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2298 /* Finally, copy percpu area over. */
2299 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2300 sechdrs
[pcpuindex
].sh_size
);
2302 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2305 struct _ddebug
*debug
;
2306 unsigned int num_debug
;
2308 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2309 sizeof(*debug
), &num_debug
);
2311 dynamic_debug_setup(debug
, num_debug
);
2314 err
= module_finalize(hdr
, sechdrs
, mod
);
2318 /* flush the icache in correct context */
2323 * Flush the instruction cache, since we've played with text.
2324 * Do it before processing of module parameters, so the module
2325 * can provide parameter accessor functions of its own.
2327 if (mod
->module_init
)
2328 flush_icache_range((unsigned long)mod
->module_init
,
2329 (unsigned long)mod
->module_init
2331 flush_icache_range((unsigned long)mod
->module_core
,
2332 (unsigned long)mod
->module_core
+ mod
->core_size
);
2337 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2338 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2341 /* Now sew it into the lists so we can get lockdep and oops
2342 * info during argument parsing. Noone should access us, since
2343 * strong_try_module_get() will fail.
2344 * lockdep/oops can run asynchronous, so use the RCU list insertion
2345 * function to insert in a way safe to concurrent readers.
2346 * The mutex protects against concurrent writers.
2348 list_add_rcu(&mod
->list
, &modules
);
2350 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2354 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2357 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2358 if (mod
->sect_attrs
)
2359 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2361 /* Get rid of temporary copy */
2368 /* Unlink carefully: kallsyms could be walking list. */
2369 list_del_rcu(&mod
->list
);
2370 synchronize_sched();
2371 module_arch_cleanup(mod
);
2373 kobject_del(&mod
->mkobj
.kobj
);
2374 kobject_put(&mod
->mkobj
.kobj
);
2376 module_unload_free(mod
);
2377 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2379 percpu_modfree(mod
->refptr
);
2381 module_free(mod
, mod
->module_init
);
2383 module_free(mod
, mod
->module_core
);
2384 /* mod will be freed with core. Don't access it beyond this line! */
2387 percpu_modfree(percpu
);
2392 return ERR_PTR(err
);
2395 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2400 /* Call module constructors. */
2401 static void do_mod_ctors(struct module
*mod
)
2403 #ifdef CONFIG_CONSTRUCTORS
2406 for (i
= 0; i
< mod
->num_ctors
; i
++)
2411 /* This is where the real work happens */
2412 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2413 unsigned long, len
, const char __user
*, uargs
)
2418 /* Must have permission */
2419 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2422 /* Only one module load at a time, please */
2423 if (mutex_lock_interruptible(&module_mutex
) != 0)
2426 /* Do all the hard work */
2427 mod
= load_module(umod
, len
, uargs
);
2429 mutex_unlock(&module_mutex
);
2430 return PTR_ERR(mod
);
2433 /* Drop lock so they can recurse */
2434 mutex_unlock(&module_mutex
);
2436 blocking_notifier_call_chain(&module_notify_list
,
2437 MODULE_STATE_COMING
, mod
);
2440 /* Start the module */
2441 if (mod
->init
!= NULL
)
2442 ret
= do_one_initcall(mod
->init
);
2444 /* Init routine failed: abort. Try to protect us from
2445 buggy refcounters. */
2446 mod
->state
= MODULE_STATE_GOING
;
2447 synchronize_sched();
2449 blocking_notifier_call_chain(&module_notify_list
,
2450 MODULE_STATE_GOING
, mod
);
2451 mutex_lock(&module_mutex
);
2453 mutex_unlock(&module_mutex
);
2454 wake_up(&module_wq
);
2459 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2460 "%s: loading module anyway...\n",
2461 __func__
, mod
->name
, ret
,
2466 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2467 mod
->state
= MODULE_STATE_LIVE
;
2468 wake_up(&module_wq
);
2469 blocking_notifier_call_chain(&module_notify_list
,
2470 MODULE_STATE_LIVE
, mod
);
2472 /* We need to finish all async code before the module init sequence is done */
2473 async_synchronize_full();
2475 mutex_lock(&module_mutex
);
2476 /* Drop initial reference. */
2478 trim_init_extable(mod
);
2479 module_free(mod
, mod
->module_init
);
2480 mod
->module_init
= NULL
;
2482 mod
->init_text_size
= 0;
2483 mutex_unlock(&module_mutex
);
2488 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2490 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2493 #ifdef CONFIG_KALLSYMS
2495 * This ignores the intensely annoying "mapping symbols" found
2496 * in ARM ELF files: $a, $t and $d.
2498 static inline int is_arm_mapping_symbol(const char *str
)
2500 return str
[0] == '$' && strchr("atd", str
[1])
2501 && (str
[2] == '\0' || str
[2] == '.');
2504 static const char *get_ksymbol(struct module
*mod
,
2506 unsigned long *size
,
2507 unsigned long *offset
)
2509 unsigned int i
, best
= 0;
2510 unsigned long nextval
;
2512 /* At worse, next value is at end of module */
2513 if (within_module_init(addr
, mod
))
2514 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2516 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2518 /* Scan for closest preceeding symbol, and next symbol. (ELF
2519 starts real symbols at 1). */
2520 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2521 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2524 /* We ignore unnamed symbols: they're uninformative
2525 * and inserted at a whim. */
2526 if (mod
->symtab
[i
].st_value
<= addr
2527 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2528 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2529 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2531 if (mod
->symtab
[i
].st_value
> addr
2532 && mod
->symtab
[i
].st_value
< nextval
2533 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2534 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2535 nextval
= mod
->symtab
[i
].st_value
;
2542 *size
= nextval
- mod
->symtab
[best
].st_value
;
2544 *offset
= addr
- mod
->symtab
[best
].st_value
;
2545 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2548 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2549 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2550 const char *module_address_lookup(unsigned long addr
,
2551 unsigned long *size
,
2552 unsigned long *offset
,
2557 const char *ret
= NULL
;
2560 list_for_each_entry_rcu(mod
, &modules
, list
) {
2561 if (within_module_init(addr
, mod
) ||
2562 within_module_core(addr
, mod
)) {
2564 *modname
= mod
->name
;
2565 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2569 /* Make a copy in here where it's safe */
2571 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2578 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2583 list_for_each_entry_rcu(mod
, &modules
, list
) {
2584 if (within_module_init(addr
, mod
) ||
2585 within_module_core(addr
, mod
)) {
2588 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2591 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2601 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2602 unsigned long *offset
, char *modname
, char *name
)
2607 list_for_each_entry_rcu(mod
, &modules
, list
) {
2608 if (within_module_init(addr
, mod
) ||
2609 within_module_core(addr
, mod
)) {
2612 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2616 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2618 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2628 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2629 char *name
, char *module_name
, int *exported
)
2634 list_for_each_entry_rcu(mod
, &modules
, list
) {
2635 if (symnum
< mod
->num_symtab
) {
2636 *value
= mod
->symtab
[symnum
].st_value
;
2637 *type
= mod
->symtab
[symnum
].st_info
;
2638 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2640 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2641 *exported
= is_exported(name
, *value
, mod
);
2645 symnum
-= mod
->num_symtab
;
2651 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2655 for (i
= 0; i
< mod
->num_symtab
; i
++)
2656 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2657 mod
->symtab
[i
].st_info
!= 'U')
2658 return mod
->symtab
[i
].st_value
;
2662 /* Look for this name: can be of form module:name. */
2663 unsigned long module_kallsyms_lookup_name(const char *name
)
2667 unsigned long ret
= 0;
2669 /* Don't lock: we're in enough trouble already. */
2671 if ((colon
= strchr(name
, ':')) != NULL
) {
2673 if ((mod
= find_module(name
)) != NULL
)
2674 ret
= mod_find_symname(mod
, colon
+1);
2677 list_for_each_entry_rcu(mod
, &modules
, list
)
2678 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2685 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2686 struct module
*, unsigned long),
2693 list_for_each_entry(mod
, &modules
, list
) {
2694 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2695 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2696 mod
, mod
->symtab
[i
].st_value
);
2703 #endif /* CONFIG_KALLSYMS */
2705 static char *module_flags(struct module
*mod
, char *buf
)
2710 mod
->state
== MODULE_STATE_GOING
||
2711 mod
->state
== MODULE_STATE_COMING
) {
2713 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2715 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2717 if (mod
->taints
& (1 << TAINT_CRAP
))
2720 * TAINT_FORCED_RMMOD: could be added.
2721 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2725 /* Show a - for module-is-being-unloaded */
2726 if (mod
->state
== MODULE_STATE_GOING
)
2728 /* Show a + for module-is-being-loaded */
2729 if (mod
->state
== MODULE_STATE_COMING
)
2738 #ifdef CONFIG_PROC_FS
2739 /* Called by the /proc file system to return a list of modules. */
2740 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2742 mutex_lock(&module_mutex
);
2743 return seq_list_start(&modules
, *pos
);
2746 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2748 return seq_list_next(p
, &modules
, pos
);
2751 static void m_stop(struct seq_file
*m
, void *p
)
2753 mutex_unlock(&module_mutex
);
2756 static int m_show(struct seq_file
*m
, void *p
)
2758 struct module
*mod
= list_entry(p
, struct module
, list
);
2761 seq_printf(m
, "%s %u",
2762 mod
->name
, mod
->init_size
+ mod
->core_size
);
2763 print_unload_info(m
, mod
);
2765 /* Informative for users. */
2766 seq_printf(m
, " %s",
2767 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2768 mod
->state
== MODULE_STATE_COMING
? "Loading":
2770 /* Used by oprofile and other similar tools. */
2771 seq_printf(m
, " 0x%p", mod
->module_core
);
2775 seq_printf(m
, " %s", module_flags(mod
, buf
));
2777 seq_printf(m
, "\n");
2781 /* Format: modulename size refcount deps address
2783 Where refcount is a number or -, and deps is a comma-separated list
2786 static const struct seq_operations modules_op
= {
2793 static int modules_open(struct inode
*inode
, struct file
*file
)
2795 return seq_open(file
, &modules_op
);
2798 static const struct file_operations proc_modules_operations
= {
2799 .open
= modules_open
,
2801 .llseek
= seq_lseek
,
2802 .release
= seq_release
,
2805 static int __init
proc_modules_init(void)
2807 proc_create("modules", 0, NULL
, &proc_modules_operations
);
2810 module_init(proc_modules_init
);
2813 /* Given an address, look for it in the module exception tables. */
2814 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2816 const struct exception_table_entry
*e
= NULL
;
2820 list_for_each_entry_rcu(mod
, &modules
, list
) {
2821 if (mod
->num_exentries
== 0)
2824 e
= search_extable(mod
->extable
,
2825 mod
->extable
+ mod
->num_exentries
- 1,
2832 /* Now, if we found one, we are running inside it now, hence
2833 we cannot unload the module, hence no refcnt needed. */
2838 * is_module_address - is this address inside a module?
2839 * @addr: the address to check.
2841 * See is_module_text_address() if you simply want to see if the address
2842 * is code (not data).
2844 bool is_module_address(unsigned long addr
)
2849 ret
= __module_address(addr
) != NULL
;
2856 * __module_address - get the module which contains an address.
2857 * @addr: the address.
2859 * Must be called with preempt disabled or module mutex held so that
2860 * module doesn't get freed during this.
2862 struct module
*__module_address(unsigned long addr
)
2866 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2869 list_for_each_entry_rcu(mod
, &modules
, list
)
2870 if (within_module_core(addr
, mod
)
2871 || within_module_init(addr
, mod
))
2875 EXPORT_SYMBOL_GPL(__module_address
);
2878 * is_module_text_address - is this address inside module code?
2879 * @addr: the address to check.
2881 * See is_module_address() if you simply want to see if the address is
2882 * anywhere in a module. See kernel_text_address() for testing if an
2883 * address corresponds to kernel or module code.
2885 bool is_module_text_address(unsigned long addr
)
2890 ret
= __module_text_address(addr
) != NULL
;
2897 * __module_text_address - get the module whose code contains an address.
2898 * @addr: the address.
2900 * Must be called with preempt disabled or module mutex held so that
2901 * module doesn't get freed during this.
2903 struct module
*__module_text_address(unsigned long addr
)
2905 struct module
*mod
= __module_address(addr
);
2907 /* Make sure it's within the text section. */
2908 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
2909 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
2914 EXPORT_SYMBOL_GPL(__module_text_address
);
2916 /* Don't grab lock, we're oopsing. */
2917 void print_modules(void)
2922 printk(KERN_DEFAULT
"Modules linked in:");
2923 /* Most callers should already have preempt disabled, but make sure */
2925 list_for_each_entry_rcu(mod
, &modules
, list
)
2926 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2928 if (last_unloaded_module
[0])
2929 printk(" [last unloaded: %s]", last_unloaded_module
);
2933 #ifdef CONFIG_MODVERSIONS
2934 /* Generate the signature for all relevant module structures here.
2935 * If these change, we don't want to try to parse the module. */
2936 void module_layout(struct module
*mod
,
2937 struct modversion_info
*ver
,
2938 struct kernel_param
*kp
,
2939 struct kernel_symbol
*ks
,
2940 struct marker
*marker
,
2941 struct tracepoint
*tp
)
2944 EXPORT_SYMBOL(module_layout
);
2947 #ifdef CONFIG_MARKERS
2948 void module_update_markers(void)
2952 mutex_lock(&module_mutex
);
2953 list_for_each_entry(mod
, &modules
, list
)
2955 marker_update_probe_range(mod
->markers
,
2956 mod
->markers
+ mod
->num_markers
);
2957 mutex_unlock(&module_mutex
);
2961 #ifdef CONFIG_TRACEPOINTS
2962 void module_update_tracepoints(void)
2966 mutex_lock(&module_mutex
);
2967 list_for_each_entry(mod
, &modules
, list
)
2969 tracepoint_update_probe_range(mod
->tracepoints
,
2970 mod
->tracepoints
+ mod
->num_tracepoints
);
2971 mutex_unlock(&module_mutex
);
2975 * Returns 0 if current not found.
2976 * Returns 1 if current found.
2978 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
2980 struct module
*iter_mod
;
2983 mutex_lock(&module_mutex
);
2984 list_for_each_entry(iter_mod
, &modules
, list
) {
2985 if (!iter_mod
->taints
) {
2987 * Sorted module list
2989 if (iter_mod
< iter
->module
)
2991 else if (iter_mod
> iter
->module
)
2992 iter
->tracepoint
= NULL
;
2993 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
2994 iter_mod
->tracepoints
,
2995 iter_mod
->tracepoints
2996 + iter_mod
->num_tracepoints
);
2998 iter
->module
= iter_mod
;
3003 mutex_unlock(&module_mutex
);