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 <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/module.h>
65 #define DEBUGP(fmt , a...)
68 #ifndef ARCH_SHF_SMALL
69 #define ARCH_SHF_SMALL 0
72 /* If this is set, the section belongs in the init part of the module */
73 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
75 /* List of modules, protected by module_mutex or preempt_disable
76 * (delete uses stop_machine/add uses RCU list operations). */
77 DEFINE_MUTEX(module_mutex
);
78 EXPORT_SYMBOL_GPL(module_mutex
);
79 static LIST_HEAD(modules
);
80 #ifdef CONFIG_KGDB_KDB
81 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
82 #endif /* CONFIG_KGDB_KDB */
85 /* Block module loading/unloading? */
86 int modules_disabled
= 0;
88 /* Waiting for a module to finish initializing? */
89 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
91 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
93 /* Bounds of module allocation, for speeding __module_address */
94 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
96 int register_module_notifier(struct notifier_block
* nb
)
98 return blocking_notifier_chain_register(&module_notify_list
, nb
);
100 EXPORT_SYMBOL(register_module_notifier
);
102 int unregister_module_notifier(struct notifier_block
* nb
)
104 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
106 EXPORT_SYMBOL(unregister_module_notifier
);
108 /* We require a truly strong try_module_get(): 0 means failure due to
109 ongoing or failed initialization etc. */
110 static inline int strong_try_module_get(struct module
*mod
)
112 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
114 if (try_module_get(mod
))
120 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
123 mod
->taints
|= (1U << flag
);
127 * A thread that wants to hold a reference to a module only while it
128 * is running can call this to safely exit. nfsd and lockd use this.
130 void __module_put_and_exit(struct module
*mod
, long code
)
135 EXPORT_SYMBOL(__module_put_and_exit
);
137 /* Find a module section: 0 means not found. */
138 static unsigned int find_sec(Elf_Ehdr
*hdr
,
140 const char *secstrings
,
145 for (i
= 1; i
< hdr
->e_shnum
; i
++)
146 /* Alloc bit cleared means "ignore it." */
147 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
148 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
153 /* Find a module section, or NULL. */
154 static void *section_addr(Elf_Ehdr
*hdr
, Elf_Shdr
*shdrs
,
155 const char *secstrings
, const char *name
)
157 /* Section 0 has sh_addr 0. */
158 return (void *)shdrs
[find_sec(hdr
, shdrs
, secstrings
, name
)].sh_addr
;
161 /* Find a module section, or NULL. Fill in number of "objects" in section. */
162 static void *section_objs(Elf_Ehdr
*hdr
,
164 const char *secstrings
,
169 unsigned int sec
= find_sec(hdr
, sechdrs
, secstrings
, name
);
171 /* Section 0 has sh_addr 0 and sh_size 0. */
172 *num
= sechdrs
[sec
].sh_size
/ object_size
;
173 return (void *)sechdrs
[sec
].sh_addr
;
176 /* Provided by the linker */
177 extern const struct kernel_symbol __start___ksymtab
[];
178 extern const struct kernel_symbol __stop___ksymtab
[];
179 extern const struct kernel_symbol __start___ksymtab_gpl
[];
180 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
181 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
182 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
183 extern const unsigned long __start___kcrctab
[];
184 extern const unsigned long __start___kcrctab_gpl
[];
185 extern const unsigned long __start___kcrctab_gpl_future
[];
186 #ifdef CONFIG_UNUSED_SYMBOLS
187 extern const struct kernel_symbol __start___ksymtab_unused
[];
188 extern const struct kernel_symbol __stop___ksymtab_unused
[];
189 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
190 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
191 extern const unsigned long __start___kcrctab_unused
[];
192 extern const unsigned long __start___kcrctab_unused_gpl
[];
195 #ifndef CONFIG_MODVERSIONS
196 #define symversion(base, idx) NULL
198 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
201 static bool each_symbol_in_section(const struct symsearch
*arr
,
202 unsigned int arrsize
,
203 struct module
*owner
,
204 bool (*fn
)(const struct symsearch
*syms
,
205 struct module
*owner
,
206 unsigned int symnum
, void *data
),
211 for (j
= 0; j
< arrsize
; j
++) {
212 for (i
= 0; i
< arr
[j
].stop
- arr
[j
].start
; i
++)
213 if (fn(&arr
[j
], owner
, i
, data
))
220 /* Returns true as soon as fn returns true, otherwise false. */
221 bool each_symbol(bool (*fn
)(const struct symsearch
*arr
, struct module
*owner
,
222 unsigned int symnum
, void *data
), 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
))
275 EXPORT_SYMBOL_GPL(each_symbol
);
277 struct find_symbol_arg
{
284 struct module
*owner
;
285 const unsigned long *crc
;
286 const struct kernel_symbol
*sym
;
289 static bool find_symbol_in_section(const struct symsearch
*syms
,
290 struct module
*owner
,
291 unsigned int symnum
, void *data
)
293 struct find_symbol_arg
*fsa
= data
;
295 if (strcmp(syms
->start
[symnum
].name
, fsa
->name
) != 0)
299 if (syms
->licence
== GPL_ONLY
)
301 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
302 printk(KERN_WARNING
"Symbol %s is being used "
303 "by a non-GPL module, which will not "
304 "be allowed in the future\n", fsa
->name
);
305 printk(KERN_WARNING
"Please see the file "
306 "Documentation/feature-removal-schedule.txt "
307 "in the kernel source tree for more details.\n");
311 #ifdef CONFIG_UNUSED_SYMBOLS
312 if (syms
->unused
&& fsa
->warn
) {
313 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
314 "however this module is using it.\n", fsa
->name
);
316 "This symbol will go away in the future.\n");
318 "Please evalute if this is the right api to use and if "
319 "it really is, submit a report the linux kernel "
320 "mailinglist together with submitting your code for "
326 fsa
->crc
= symversion(syms
->crcs
, symnum
);
327 fsa
->sym
= &syms
->start
[symnum
];
331 /* Find a symbol and return it, along with, (optional) crc and
332 * (optional) module which owns it */
333 const struct kernel_symbol
*find_symbol(const char *name
,
334 struct module
**owner
,
335 const unsigned long **crc
,
339 struct find_symbol_arg fsa
;
345 if (each_symbol(find_symbol_in_section
, &fsa
)) {
353 DEBUGP("Failed to find symbol %s\n", name
);
356 EXPORT_SYMBOL_GPL(find_symbol
);
358 /* Search for module by name: must hold module_mutex. */
359 struct module
*find_module(const char *name
)
363 list_for_each_entry(mod
, &modules
, list
) {
364 if (strcmp(mod
->name
, name
) == 0)
369 EXPORT_SYMBOL_GPL(find_module
);
373 static inline void __percpu
*mod_percpu(struct module
*mod
)
378 static int percpu_modalloc(struct module
*mod
,
379 unsigned long size
, unsigned long align
)
381 if (align
> PAGE_SIZE
) {
382 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
383 mod
->name
, align
, PAGE_SIZE
);
387 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
390 "Could not allocate %lu bytes percpu data\n", size
);
393 mod
->percpu_size
= size
;
397 static void percpu_modfree(struct module
*mod
)
399 free_percpu(mod
->percpu
);
402 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
404 const char *secstrings
)
406 return find_sec(hdr
, sechdrs
, secstrings
, ".data..percpu");
409 static void percpu_modcopy(struct module
*mod
,
410 const void *from
, unsigned long size
)
414 for_each_possible_cpu(cpu
)
415 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
419 * is_module_percpu_address - test whether address is from module static percpu
420 * @addr: address to test
422 * Test whether @addr belongs to module static percpu area.
425 * %true if @addr is from module static percpu area
427 bool is_module_percpu_address(unsigned long addr
)
434 list_for_each_entry_rcu(mod
, &modules
, list
) {
435 if (!mod
->percpu_size
)
437 for_each_possible_cpu(cpu
) {
438 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
440 if ((void *)addr
>= start
&&
441 (void *)addr
< start
+ mod
->percpu_size
) {
452 #else /* ... !CONFIG_SMP */
454 static inline void __percpu
*mod_percpu(struct module
*mod
)
458 static inline int percpu_modalloc(struct module
*mod
,
459 unsigned long size
, unsigned long align
)
463 static inline void percpu_modfree(struct module
*mod
)
466 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
468 const char *secstrings
)
472 static inline void percpu_modcopy(struct module
*mod
,
473 const void *from
, unsigned long size
)
475 /* pcpusec should be 0, and size of that section should be 0. */
478 bool is_module_percpu_address(unsigned long addr
)
483 #endif /* CONFIG_SMP */
485 #define MODINFO_ATTR(field) \
486 static void setup_modinfo_##field(struct module *mod, const char *s) \
488 mod->field = kstrdup(s, GFP_KERNEL); \
490 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
491 struct module *mod, char *buffer) \
493 return sprintf(buffer, "%s\n", mod->field); \
495 static int modinfo_##field##_exists(struct module *mod) \
497 return mod->field != NULL; \
499 static void free_modinfo_##field(struct module *mod) \
504 static struct module_attribute modinfo_##field = { \
505 .attr = { .name = __stringify(field), .mode = 0444 }, \
506 .show = show_modinfo_##field, \
507 .setup = setup_modinfo_##field, \
508 .test = modinfo_##field##_exists, \
509 .free = free_modinfo_##field, \
512 MODINFO_ATTR(version
);
513 MODINFO_ATTR(srcversion
);
515 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
517 #ifdef CONFIG_MODULE_UNLOAD
519 EXPORT_TRACEPOINT_SYMBOL(module_get
);
521 /* Init the unload section of the module. */
522 static void module_unload_init(struct module
*mod
)
526 INIT_LIST_HEAD(&mod
->source_list
);
527 INIT_LIST_HEAD(&mod
->target_list
);
528 for_each_possible_cpu(cpu
) {
529 per_cpu_ptr(mod
->refptr
, cpu
)->incs
= 0;
530 per_cpu_ptr(mod
->refptr
, cpu
)->decs
= 0;
533 /* Hold reference count during initialization. */
534 __this_cpu_write(mod
->refptr
->incs
, 1);
535 /* Backwards compatibility macros put refcount during init. */
536 mod
->waiter
= current
;
539 /* modules using other modules */
542 struct list_head source_list
;
543 struct list_head target_list
;
544 struct module
*source
, *target
;
547 /* Does a already use b? */
548 static int already_uses(struct module
*a
, struct module
*b
)
550 struct module_use
*use
;
552 list_for_each_entry(use
, &b
->source_list
, source_list
) {
553 if (use
->source
== a
) {
554 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
558 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
564 * - we add 'a' as a "source", 'b' as a "target" of module use
565 * - the module_use is added to the list of 'b' sources (so
566 * 'b' can walk the list to see who sourced them), and of 'a'
567 * targets (so 'a' can see what modules it targets).
569 static int add_module_usage(struct module
*a
, struct module
*b
)
572 struct module_use
*use
;
574 DEBUGP("Allocating new usage for %s.\n", a
->name
);
575 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
577 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
583 list_add(&use
->source_list
, &b
->source_list
);
584 list_add(&use
->target_list
, &a
->target_list
);
585 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
589 /* Module a uses b */
590 int use_module(struct module
*a
, struct module
*b
)
592 struct module_use
*use
;
595 if (b
== NULL
|| already_uses(a
, b
)) return 1;
597 /* If we're interrupted or time out, we fail. */
598 if (wait_event_interruptible_timeout(
599 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
601 printk("%s: gave up waiting for init of module %s.\n",
606 /* If strong_try_module_get() returned a different error, we fail. */
610 err
= add_module_usage(a
, b
);
617 EXPORT_SYMBOL_GPL(use_module
);
619 /* Clear the unload stuff of the module. */
620 static void module_unload_free(struct module
*mod
)
622 struct module_use
*use
, *tmp
;
624 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
625 struct module
*i
= use
->target
;
626 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
628 list_del(&use
->source_list
);
629 list_del(&use
->target_list
);
631 sysfs_remove_link(i
->holders_dir
, mod
->name
);
635 #ifdef CONFIG_MODULE_FORCE_UNLOAD
636 static inline int try_force_unload(unsigned int flags
)
638 int ret
= (flags
& O_TRUNC
);
640 add_taint(TAINT_FORCED_RMMOD
);
644 static inline int try_force_unload(unsigned int flags
)
648 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
657 /* Whole machine is stopped with interrupts off when this runs. */
658 static int __try_stop_module(void *_sref
)
660 struct stopref
*sref
= _sref
;
662 /* If it's not unused, quit unless we're forcing. */
663 if (module_refcount(sref
->mod
) != 0) {
664 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
668 /* Mark it as dying. */
669 sref
->mod
->state
= MODULE_STATE_GOING
;
673 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
675 if (flags
& O_NONBLOCK
) {
676 struct stopref sref
= { mod
, flags
, forced
};
678 return stop_machine(__try_stop_module
, &sref
, NULL
);
680 /* We don't need to stop the machine for this. */
681 mod
->state
= MODULE_STATE_GOING
;
687 unsigned int module_refcount(struct module
*mod
)
689 unsigned int incs
= 0, decs
= 0;
692 for_each_possible_cpu(cpu
)
693 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
695 * ensure the incs are added up after the decs.
696 * module_put ensures incs are visible before decs with smp_wmb.
698 * This 2-count scheme avoids the situation where the refcount
699 * for CPU0 is read, then CPU0 increments the module refcount,
700 * then CPU1 drops that refcount, then the refcount for CPU1 is
701 * read. We would record a decrement but not its corresponding
702 * increment so we would see a low count (disaster).
704 * Rare situation? But module_refcount can be preempted, and we
705 * might be tallying up 4096+ CPUs. So it is not impossible.
708 for_each_possible_cpu(cpu
)
709 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
712 EXPORT_SYMBOL(module_refcount
);
714 /* This exists whether we can unload or not */
715 static void free_module(struct module
*mod
);
717 static void wait_for_zero_refcount(struct module
*mod
)
719 /* Since we might sleep for some time, release the mutex first */
720 mutex_unlock(&module_mutex
);
722 DEBUGP("Looking at refcount...\n");
723 set_current_state(TASK_UNINTERRUPTIBLE
);
724 if (module_refcount(mod
) == 0)
728 current
->state
= TASK_RUNNING
;
729 mutex_lock(&module_mutex
);
732 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
736 char name
[MODULE_NAME_LEN
];
739 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
742 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
744 name
[MODULE_NAME_LEN
-1] = '\0';
746 if (mutex_lock_interruptible(&module_mutex
) != 0)
749 mod
= find_module(name
);
755 if (!list_empty(&mod
->source_list
)) {
756 /* Other modules depend on us: get rid of them first. */
761 /* Doing init or already dying? */
762 if (mod
->state
!= MODULE_STATE_LIVE
) {
763 /* FIXME: if (force), slam module count and wake up
765 DEBUGP("%s already dying\n", mod
->name
);
770 /* If it has an init func, it must have an exit func to unload */
771 if (mod
->init
&& !mod
->exit
) {
772 forced
= try_force_unload(flags
);
774 /* This module can't be removed */
780 /* Set this up before setting mod->state */
781 mod
->waiter
= current
;
783 /* Stop the machine so refcounts can't move and disable module. */
784 ret
= try_stop_module(mod
, flags
, &forced
);
788 /* Never wait if forced. */
789 if (!forced
&& module_refcount(mod
) != 0)
790 wait_for_zero_refcount(mod
);
792 mutex_unlock(&module_mutex
);
793 /* Final destruction now noone is using it. */
794 if (mod
->exit
!= NULL
)
796 blocking_notifier_call_chain(&module_notify_list
,
797 MODULE_STATE_GOING
, mod
);
798 async_synchronize_full();
799 mutex_lock(&module_mutex
);
800 /* Store the name of the last unloaded module for diagnostic purposes */
801 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
802 ddebug_remove_module(mod
->name
);
806 mutex_unlock(&module_mutex
);
810 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
812 struct module_use
*use
;
813 int printed_something
= 0;
815 seq_printf(m
, " %u ", module_refcount(mod
));
817 /* Always include a trailing , so userspace can differentiate
818 between this and the old multi-field proc format. */
819 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
820 printed_something
= 1;
821 seq_printf(m
, "%s,", use
->source
->name
);
824 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
825 printed_something
= 1;
826 seq_printf(m
, "[permanent],");
829 if (!printed_something
)
833 void __symbol_put(const char *symbol
)
835 struct module
*owner
;
838 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
843 EXPORT_SYMBOL(__symbol_put
);
845 /* Note this assumes addr is a function, which it currently always is. */
846 void symbol_put_addr(void *addr
)
848 struct module
*modaddr
;
849 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
851 if (core_kernel_text(a
))
854 /* module_text_address is safe here: we're supposed to have reference
855 * to module from symbol_get, so it can't go away. */
856 modaddr
= __module_text_address(a
);
860 EXPORT_SYMBOL_GPL(symbol_put_addr
);
862 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
863 struct module
*mod
, char *buffer
)
865 return sprintf(buffer
, "%u\n", module_refcount(mod
));
868 static struct module_attribute refcnt
= {
869 .attr
= { .name
= "refcnt", .mode
= 0444 },
873 void module_put(struct module
*module
)
877 smp_wmb(); /* see comment in module_refcount */
878 __this_cpu_inc(module
->refptr
->decs
);
880 trace_module_put(module
, _RET_IP_
);
881 /* Maybe they're waiting for us to drop reference? */
882 if (unlikely(!module_is_live(module
)))
883 wake_up_process(module
->waiter
);
887 EXPORT_SYMBOL(module_put
);
889 #else /* !CONFIG_MODULE_UNLOAD */
890 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
892 /* We don't know the usage count, or what modules are using. */
893 seq_printf(m
, " - -");
896 static inline void module_unload_free(struct module
*mod
)
900 int use_module(struct module
*a
, struct module
*b
)
902 return strong_try_module_get(b
) == 0;
904 EXPORT_SYMBOL_GPL(use_module
);
906 static inline void module_unload_init(struct module
*mod
)
909 #endif /* CONFIG_MODULE_UNLOAD */
911 static ssize_t
show_initstate(struct module_attribute
*mattr
,
912 struct module
*mod
, char *buffer
)
914 const char *state
= "unknown";
916 switch (mod
->state
) {
917 case MODULE_STATE_LIVE
:
920 case MODULE_STATE_COMING
:
923 case MODULE_STATE_GOING
:
927 return sprintf(buffer
, "%s\n", state
);
930 static struct module_attribute initstate
= {
931 .attr
= { .name
= "initstate", .mode
= 0444 },
932 .show
= show_initstate
,
935 static struct module_attribute
*modinfo_attrs
[] = {
939 #ifdef CONFIG_MODULE_UNLOAD
945 static const char vermagic
[] = VERMAGIC_STRING
;
947 static int try_to_force_load(struct module
*mod
, const char *reason
)
949 #ifdef CONFIG_MODULE_FORCE_LOAD
950 if (!test_taint(TAINT_FORCED_MODULE
))
951 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
953 add_taint_module(mod
, TAINT_FORCED_MODULE
);
960 #ifdef CONFIG_MODVERSIONS
961 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
962 static unsigned long maybe_relocated(unsigned long crc
,
963 const struct module
*crc_owner
)
965 #ifdef ARCH_RELOCATES_KCRCTAB
966 if (crc_owner
== NULL
)
967 return crc
- (unsigned long)reloc_start
;
972 static int check_version(Elf_Shdr
*sechdrs
,
973 unsigned int versindex
,
976 const unsigned long *crc
,
977 const struct module
*crc_owner
)
979 unsigned int i
, num_versions
;
980 struct modversion_info
*versions
;
982 /* Exporting module didn't supply crcs? OK, we're already tainted. */
986 /* No versions at all? modprobe --force does this. */
988 return try_to_force_load(mod
, symname
) == 0;
990 versions
= (void *) sechdrs
[versindex
].sh_addr
;
991 num_versions
= sechdrs
[versindex
].sh_size
992 / sizeof(struct modversion_info
);
994 for (i
= 0; i
< num_versions
; i
++) {
995 if (strcmp(versions
[i
].name
, symname
) != 0)
998 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1000 DEBUGP("Found checksum %lX vs module %lX\n",
1001 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1005 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1006 mod
->name
, symname
);
1010 printk("%s: disagrees about version of symbol %s\n",
1011 mod
->name
, symname
);
1015 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1016 unsigned int versindex
,
1019 const unsigned long *crc
;
1021 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1024 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1028 /* First part is kernel version, which we ignore if module has crcs. */
1029 static inline int same_magic(const char *amagic
, const char *bmagic
,
1033 amagic
+= strcspn(amagic
, " ");
1034 bmagic
+= strcspn(bmagic
, " ");
1036 return strcmp(amagic
, bmagic
) == 0;
1039 static inline int check_version(Elf_Shdr
*sechdrs
,
1040 unsigned int versindex
,
1041 const char *symname
,
1043 const unsigned long *crc
,
1044 const struct module
*crc_owner
)
1049 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1050 unsigned int versindex
,
1056 static inline int same_magic(const char *amagic
, const char *bmagic
,
1059 return strcmp(amagic
, bmagic
) == 0;
1061 #endif /* CONFIG_MODVERSIONS */
1063 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1064 Must be holding module_mutex. */
1065 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1066 unsigned int versindex
,
1070 struct module
*owner
;
1071 const struct kernel_symbol
*sym
;
1072 const unsigned long *crc
;
1074 sym
= find_symbol(name
, &owner
, &crc
,
1075 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1076 /* use_module can fail due to OOM,
1077 or module initialization or unloading */
1079 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
, owner
)
1080 || !use_module(mod
, owner
))
1087 * /sys/module/foo/sections stuff
1088 * J. Corbet <corbet@lwn.net>
1090 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1092 static inline bool sect_empty(const Elf_Shdr
*sect
)
1094 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1097 struct module_sect_attr
1099 struct module_attribute mattr
;
1101 unsigned long address
;
1104 struct module_sect_attrs
1106 struct attribute_group grp
;
1107 unsigned int nsections
;
1108 struct module_sect_attr attrs
[0];
1111 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1112 struct module
*mod
, char *buf
)
1114 struct module_sect_attr
*sattr
=
1115 container_of(mattr
, struct module_sect_attr
, mattr
);
1116 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1119 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1121 unsigned int section
;
1123 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1124 kfree(sect_attrs
->attrs
[section
].name
);
1128 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1129 char *secstrings
, Elf_Shdr
*sechdrs
)
1131 unsigned int nloaded
= 0, i
, size
[2];
1132 struct module_sect_attrs
*sect_attrs
;
1133 struct module_sect_attr
*sattr
;
1134 struct attribute
**gattr
;
1136 /* Count loaded sections and allocate structures */
1137 for (i
= 0; i
< nsect
; i
++)
1138 if (!sect_empty(&sechdrs
[i
]))
1140 size
[0] = ALIGN(sizeof(*sect_attrs
)
1141 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1142 sizeof(sect_attrs
->grp
.attrs
[0]));
1143 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1144 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1145 if (sect_attrs
== NULL
)
1148 /* Setup section attributes. */
1149 sect_attrs
->grp
.name
= "sections";
1150 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1152 sect_attrs
->nsections
= 0;
1153 sattr
= §_attrs
->attrs
[0];
1154 gattr
= §_attrs
->grp
.attrs
[0];
1155 for (i
= 0; i
< nsect
; i
++) {
1156 if (sect_empty(&sechdrs
[i
]))
1158 sattr
->address
= sechdrs
[i
].sh_addr
;
1159 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1161 if (sattr
->name
== NULL
)
1163 sect_attrs
->nsections
++;
1164 sysfs_attr_init(&sattr
->mattr
.attr
);
1165 sattr
->mattr
.show
= module_sect_show
;
1166 sattr
->mattr
.store
= NULL
;
1167 sattr
->mattr
.attr
.name
= sattr
->name
;
1168 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1169 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1173 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1176 mod
->sect_attrs
= sect_attrs
;
1179 free_sect_attrs(sect_attrs
);
1182 static void remove_sect_attrs(struct module
*mod
)
1184 if (mod
->sect_attrs
) {
1185 sysfs_remove_group(&mod
->mkobj
.kobj
,
1186 &mod
->sect_attrs
->grp
);
1187 /* We are positive that no one is using any sect attrs
1188 * at this point. Deallocate immediately. */
1189 free_sect_attrs(mod
->sect_attrs
);
1190 mod
->sect_attrs
= NULL
;
1195 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1198 struct module_notes_attrs
{
1199 struct kobject
*dir
;
1201 struct bin_attribute attrs
[0];
1204 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1205 struct bin_attribute
*bin_attr
,
1206 char *buf
, loff_t pos
, size_t count
)
1209 * The caller checked the pos and count against our size.
1211 memcpy(buf
, bin_attr
->private + pos
, count
);
1215 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1218 if (notes_attrs
->dir
) {
1220 sysfs_remove_bin_file(notes_attrs
->dir
,
1221 ¬es_attrs
->attrs
[i
]);
1222 kobject_put(notes_attrs
->dir
);
1227 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1228 char *secstrings
, Elf_Shdr
*sechdrs
)
1230 unsigned int notes
, loaded
, i
;
1231 struct module_notes_attrs
*notes_attrs
;
1232 struct bin_attribute
*nattr
;
1234 /* failed to create section attributes, so can't create notes */
1235 if (!mod
->sect_attrs
)
1238 /* Count notes sections and allocate structures. */
1240 for (i
= 0; i
< nsect
; i
++)
1241 if (!sect_empty(&sechdrs
[i
]) &&
1242 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1248 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1249 + notes
* sizeof(notes_attrs
->attrs
[0]),
1251 if (notes_attrs
== NULL
)
1254 notes_attrs
->notes
= notes
;
1255 nattr
= ¬es_attrs
->attrs
[0];
1256 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1257 if (sect_empty(&sechdrs
[i
]))
1259 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1260 sysfs_bin_attr_init(nattr
);
1261 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1262 nattr
->attr
.mode
= S_IRUGO
;
1263 nattr
->size
= sechdrs
[i
].sh_size
;
1264 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1265 nattr
->read
= module_notes_read
;
1271 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1272 if (!notes_attrs
->dir
)
1275 for (i
= 0; i
< notes
; ++i
)
1276 if (sysfs_create_bin_file(notes_attrs
->dir
,
1277 ¬es_attrs
->attrs
[i
]))
1280 mod
->notes_attrs
= notes_attrs
;
1284 free_notes_attrs(notes_attrs
, i
);
1287 static void remove_notes_attrs(struct module
*mod
)
1289 if (mod
->notes_attrs
)
1290 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1295 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1296 char *sectstrings
, Elf_Shdr
*sechdrs
)
1300 static inline void remove_sect_attrs(struct module
*mod
)
1304 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1305 char *sectstrings
, Elf_Shdr
*sechdrs
)
1309 static inline void remove_notes_attrs(struct module
*mod
)
1315 int module_add_modinfo_attrs(struct module
*mod
)
1317 struct module_attribute
*attr
;
1318 struct module_attribute
*temp_attr
;
1322 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1323 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1325 if (!mod
->modinfo_attrs
)
1328 temp_attr
= mod
->modinfo_attrs
;
1329 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1331 (attr
->test
&& attr
->test(mod
))) {
1332 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1333 sysfs_attr_init(&temp_attr
->attr
);
1334 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1341 void module_remove_modinfo_attrs(struct module
*mod
)
1343 struct module_attribute
*attr
;
1346 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1347 /* pick a field to test for end of list */
1348 if (!attr
->attr
.name
)
1350 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1354 kfree(mod
->modinfo_attrs
);
1357 int mod_sysfs_init(struct module
*mod
)
1360 struct kobject
*kobj
;
1362 if (!module_sysfs_initialized
) {
1363 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1369 kobj
= kset_find_obj(module_kset
, mod
->name
);
1371 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1377 mod
->mkobj
.mod
= mod
;
1379 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1380 mod
->mkobj
.kobj
.kset
= module_kset
;
1381 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1384 kobject_put(&mod
->mkobj
.kobj
);
1386 /* delay uevent until full sysfs population */
1391 int mod_sysfs_setup(struct module
*mod
,
1392 struct kernel_param
*kparam
,
1393 unsigned int num_params
)
1397 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1398 if (!mod
->holders_dir
) {
1403 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1405 goto out_unreg_holders
;
1407 err
= module_add_modinfo_attrs(mod
);
1409 goto out_unreg_param
;
1411 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1415 module_param_sysfs_remove(mod
);
1417 kobject_put(mod
->holders_dir
);
1419 kobject_put(&mod
->mkobj
.kobj
);
1423 static void mod_sysfs_fini(struct module
*mod
)
1425 kobject_put(&mod
->mkobj
.kobj
);
1428 #else /* CONFIG_SYSFS */
1430 static void mod_sysfs_fini(struct module
*mod
)
1434 #endif /* CONFIG_SYSFS */
1436 static void mod_kobject_remove(struct module
*mod
)
1438 module_remove_modinfo_attrs(mod
);
1439 module_param_sysfs_remove(mod
);
1440 kobject_put(mod
->mkobj
.drivers_dir
);
1441 kobject_put(mod
->holders_dir
);
1442 mod_sysfs_fini(mod
);
1446 * unlink the module with the whole machine is stopped with interrupts off
1447 * - this defends against kallsyms not taking locks
1449 static int __unlink_module(void *_mod
)
1451 struct module
*mod
= _mod
;
1452 list_del(&mod
->list
);
1456 /* Free a module, remove from lists, etc (must hold module_mutex). */
1457 static void free_module(struct module
*mod
)
1459 trace_module_free(mod
);
1461 /* Delete from various lists */
1462 stop_machine(__unlink_module
, mod
, NULL
);
1463 remove_notes_attrs(mod
);
1464 remove_sect_attrs(mod
);
1465 mod_kobject_remove(mod
);
1467 /* Arch-specific cleanup. */
1468 module_arch_cleanup(mod
);
1470 /* Module unload stuff */
1471 module_unload_free(mod
);
1473 /* Free any allocated parameters. */
1474 destroy_params(mod
->kp
, mod
->num_kp
);
1476 /* This may be NULL, but that's OK */
1477 module_free(mod
, mod
->module_init
);
1479 percpu_modfree(mod
);
1480 #if defined(CONFIG_MODULE_UNLOAD)
1482 free_percpu(mod
->refptr
);
1484 /* Free lock-classes: */
1485 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1487 /* Finally, free the core (containing the module structure) */
1488 module_free(mod
, mod
->module_core
);
1491 update_protections(current
->mm
);
1495 void *__symbol_get(const char *symbol
)
1497 struct module
*owner
;
1498 const struct kernel_symbol
*sym
;
1501 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1502 if (sym
&& strong_try_module_get(owner
))
1506 return sym
? (void *)sym
->value
: NULL
;
1508 EXPORT_SYMBOL_GPL(__symbol_get
);
1511 * Ensure that an exported symbol [global namespace] does not already exist
1512 * in the kernel or in some other module's exported symbol table.
1514 static int verify_export_symbols(struct module
*mod
)
1517 struct module
*owner
;
1518 const struct kernel_symbol
*s
;
1520 const struct kernel_symbol
*sym
;
1523 { mod
->syms
, mod
->num_syms
},
1524 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1525 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1526 #ifdef CONFIG_UNUSED_SYMBOLS
1527 { mod
->unused_syms
, mod
->num_unused_syms
},
1528 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1532 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1533 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1534 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1536 "%s: exports duplicate symbol %s"
1538 mod
->name
, s
->name
, module_name(owner
));
1546 /* Change all symbols so that st_value encodes the pointer directly. */
1547 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1548 unsigned int symindex
,
1550 unsigned int versindex
,
1551 unsigned int pcpuindex
,
1554 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1555 unsigned long secbase
;
1556 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1558 const struct kernel_symbol
*ksym
;
1560 for (i
= 1; i
< n
; i
++) {
1561 switch (sym
[i
].st_shndx
) {
1563 /* We compiled with -fno-common. These are not
1564 supposed to happen. */
1565 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1566 printk("%s: please compile with -fno-common\n",
1572 /* Don't need to do anything */
1573 DEBUGP("Absolute symbol: 0x%08lx\n",
1574 (long)sym
[i
].st_value
);
1578 ksym
= resolve_symbol(sechdrs
, versindex
,
1579 strtab
+ sym
[i
].st_name
, mod
);
1580 /* Ok if resolved. */
1582 sym
[i
].st_value
= ksym
->value
;
1587 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1590 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1591 mod
->name
, strtab
+ sym
[i
].st_name
);
1596 /* Divert to percpu allocation if a percpu var. */
1597 if (sym
[i
].st_shndx
== pcpuindex
)
1598 secbase
= (unsigned long)mod_percpu(mod
);
1600 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1601 sym
[i
].st_value
+= secbase
;
1609 /* Additional bytes needed by arch in front of individual sections */
1610 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1611 unsigned int section
)
1613 /* default implementation just returns zero */
1617 /* Update size with this section: return offset. */
1618 static long get_offset(struct module
*mod
, unsigned int *size
,
1619 Elf_Shdr
*sechdr
, unsigned int section
)
1623 *size
+= arch_mod_section_prepend(mod
, section
);
1624 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1625 *size
= ret
+ sechdr
->sh_size
;
1629 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1630 might -- code, read-only data, read-write data, small data. Tally
1631 sizes, and place the offsets into sh_entsize fields: high bit means it
1633 static void layout_sections(struct module
*mod
,
1634 const Elf_Ehdr
*hdr
,
1636 const char *secstrings
)
1638 static unsigned long const masks
[][2] = {
1639 /* NOTE: all executable code must be the first section
1640 * in this array; otherwise modify the text_size
1641 * finder in the two loops below */
1642 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1643 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1644 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1645 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1649 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1650 sechdrs
[i
].sh_entsize
= ~0UL;
1652 DEBUGP("Core section allocation order:\n");
1653 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1654 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1655 Elf_Shdr
*s
= &sechdrs
[i
];
1657 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1658 || (s
->sh_flags
& masks
[m
][1])
1659 || s
->sh_entsize
!= ~0UL
1660 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1662 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1663 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1666 mod
->core_text_size
= mod
->core_size
;
1669 DEBUGP("Init section allocation order:\n");
1670 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1671 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1672 Elf_Shdr
*s
= &sechdrs
[i
];
1674 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1675 || (s
->sh_flags
& masks
[m
][1])
1676 || s
->sh_entsize
!= ~0UL
1677 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1679 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1680 | INIT_OFFSET_MASK
);
1681 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1684 mod
->init_text_size
= mod
->init_size
;
1688 static void set_license(struct module
*mod
, const char *license
)
1691 license
= "unspecified";
1693 if (!license_is_gpl_compatible(license
)) {
1694 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1695 printk(KERN_WARNING
"%s: module license '%s' taints "
1696 "kernel.\n", mod
->name
, license
);
1697 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1701 /* Parse tag=value strings from .modinfo section */
1702 static char *next_string(char *string
, unsigned long *secsize
)
1704 /* Skip non-zero chars */
1707 if ((*secsize
)-- <= 1)
1711 /* Skip any zero padding. */
1712 while (!string
[0]) {
1714 if ((*secsize
)-- <= 1)
1720 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1725 unsigned int taglen
= strlen(tag
);
1726 unsigned long size
= sechdrs
[info
].sh_size
;
1728 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1729 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1730 return p
+ taglen
+ 1;
1735 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1736 unsigned int infoindex
)
1738 struct module_attribute
*attr
;
1741 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1744 get_modinfo(sechdrs
,
1750 static void free_modinfo(struct module
*mod
)
1752 struct module_attribute
*attr
;
1755 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1761 #ifdef CONFIG_KALLSYMS
1763 /* lookup symbol in given range of kernel_symbols */
1764 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1765 const struct kernel_symbol
*start
,
1766 const struct kernel_symbol
*stop
)
1768 const struct kernel_symbol
*ks
= start
;
1769 for (; ks
< stop
; ks
++)
1770 if (strcmp(ks
->name
, name
) == 0)
1775 static int is_exported(const char *name
, unsigned long value
,
1776 const struct module
*mod
)
1778 const struct kernel_symbol
*ks
;
1780 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1782 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1783 return ks
!= NULL
&& ks
->value
== value
;
1787 static char elf_type(const Elf_Sym
*sym
,
1789 const char *secstrings
,
1792 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1793 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1798 if (sym
->st_shndx
== SHN_UNDEF
)
1800 if (sym
->st_shndx
== SHN_ABS
)
1802 if (sym
->st_shndx
>= SHN_LORESERVE
)
1804 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1806 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1807 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1808 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1810 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1815 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1816 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1821 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1826 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
1829 const Elf_Shdr
*sec
;
1831 if (src
->st_shndx
== SHN_UNDEF
1832 || src
->st_shndx
>= shnum
1836 sec
= sechdrs
+ src
->st_shndx
;
1837 if (!(sec
->sh_flags
& SHF_ALLOC
)
1838 #ifndef CONFIG_KALLSYMS_ALL
1839 || !(sec
->sh_flags
& SHF_EXECINSTR
)
1841 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
1847 static unsigned long layout_symtab(struct module
*mod
,
1849 unsigned int symindex
,
1850 unsigned int strindex
,
1851 const Elf_Ehdr
*hdr
,
1852 const char *secstrings
,
1853 unsigned long *pstroffs
,
1854 unsigned long *strmap
)
1856 unsigned long symoffs
;
1857 Elf_Shdr
*symsect
= sechdrs
+ symindex
;
1858 Elf_Shdr
*strsect
= sechdrs
+ strindex
;
1861 unsigned int i
, nsrc
, ndst
;
1863 /* Put symbol section at end of init part of module. */
1864 symsect
->sh_flags
|= SHF_ALLOC
;
1865 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
1866 symindex
) | INIT_OFFSET_MASK
;
1867 DEBUGP("\t%s\n", secstrings
+ symsect
->sh_name
);
1869 src
= (void *)hdr
+ symsect
->sh_offset
;
1870 nsrc
= symsect
->sh_size
/ sizeof(*src
);
1871 strtab
= (void *)hdr
+ strsect
->sh_offset
;
1872 for (ndst
= i
= 1; i
< nsrc
; ++i
, ++src
)
1873 if (is_core_symbol(src
, sechdrs
, hdr
->e_shnum
)) {
1874 unsigned int j
= src
->st_name
;
1876 while(!__test_and_set_bit(j
, strmap
) && strtab
[j
])
1881 /* Append room for core symbols at end of core part. */
1882 symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
1883 mod
->core_size
= symoffs
+ ndst
* sizeof(Elf_Sym
);
1885 /* Put string table section at end of init part of module. */
1886 strsect
->sh_flags
|= SHF_ALLOC
;
1887 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
1888 strindex
) | INIT_OFFSET_MASK
;
1889 DEBUGP("\t%s\n", secstrings
+ strsect
->sh_name
);
1891 /* Append room for core symbols' strings at end of core part. */
1892 *pstroffs
= mod
->core_size
;
1893 __set_bit(0, strmap
);
1894 mod
->core_size
+= bitmap_weight(strmap
, strsect
->sh_size
);
1899 static void add_kallsyms(struct module
*mod
,
1902 unsigned int symindex
,
1903 unsigned int strindex
,
1904 unsigned long symoffs
,
1905 unsigned long stroffs
,
1906 const char *secstrings
,
1907 unsigned long *strmap
)
1909 unsigned int i
, ndst
;
1914 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1915 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1916 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1918 /* Set types up while we still have access to sections. */
1919 for (i
= 0; i
< mod
->num_symtab
; i
++)
1920 mod
->symtab
[i
].st_info
1921 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1923 mod
->core_symtab
= dst
= mod
->module_core
+ symoffs
;
1926 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
1927 if (!is_core_symbol(src
, sechdrs
, shnum
))
1930 dst
[ndst
].st_name
= bitmap_weight(strmap
, dst
[ndst
].st_name
);
1933 mod
->core_num_syms
= ndst
;
1935 mod
->core_strtab
= s
= mod
->module_core
+ stroffs
;
1936 for (*s
= 0, i
= 1; i
< sechdrs
[strindex
].sh_size
; ++i
)
1937 if (test_bit(i
, strmap
))
1938 *++s
= mod
->strtab
[i
];
1941 static inline unsigned long layout_symtab(struct module
*mod
,
1943 unsigned int symindex
,
1944 unsigned int strindex
,
1945 const Elf_Ehdr
*hdr
,
1946 const char *secstrings
,
1947 unsigned long *pstroffs
,
1948 unsigned long *strmap
)
1953 static inline void add_kallsyms(struct module
*mod
,
1956 unsigned int symindex
,
1957 unsigned int strindex
,
1958 unsigned long symoffs
,
1959 unsigned long stroffs
,
1960 const char *secstrings
,
1961 const unsigned long *strmap
)
1964 #endif /* CONFIG_KALLSYMS */
1966 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
1968 #ifdef CONFIG_DYNAMIC_DEBUG
1969 if (ddebug_add_module(debug
, num
, debug
->modname
))
1970 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
1975 static void *module_alloc_update_bounds(unsigned long size
)
1977 void *ret
= module_alloc(size
);
1980 /* Update module bounds. */
1981 if ((unsigned long)ret
< module_addr_min
)
1982 module_addr_min
= (unsigned long)ret
;
1983 if ((unsigned long)ret
+ size
> module_addr_max
)
1984 module_addr_max
= (unsigned long)ret
+ size
;
1989 #ifdef CONFIG_DEBUG_KMEMLEAK
1990 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1991 Elf_Shdr
*sechdrs
, char *secstrings
)
1995 /* only scan the sections containing data */
1996 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
1998 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1999 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2001 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
2002 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
2005 kmemleak_scan_area((void *)sechdrs
[i
].sh_addr
,
2006 sechdrs
[i
].sh_size
, GFP_KERNEL
);
2010 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2011 Elf_Shdr
*sechdrs
, char *secstrings
)
2016 /* Allocate and load the module: note that size of section 0 is always
2017 zero, and we rely on this for optional sections. */
2018 static noinline
struct module
*load_module(void __user
*umod
,
2020 const char __user
*uargs
)
2024 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
2027 unsigned int symindex
= 0;
2028 unsigned int strindex
= 0;
2029 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
2032 void *ptr
= NULL
; /* Stops spurious gcc warning */
2033 unsigned long symoffs
, stroffs
, *strmap
;
2034 void __percpu
*percpu
;
2036 mm_segment_t old_fs
;
2038 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2040 if (len
< sizeof(*hdr
))
2041 return ERR_PTR(-ENOEXEC
);
2043 /* Suck in entire file: we'll want most of it. */
2044 /* vmalloc barfs on "unusual" numbers. Check here */
2045 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
2046 return ERR_PTR(-ENOMEM
);
2048 if (copy_from_user(hdr
, umod
, len
) != 0) {
2053 /* Sanity checks against insmoding binaries or wrong arch,
2054 weird elf version */
2055 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2056 || hdr
->e_type
!= ET_REL
2057 || !elf_check_arch(hdr
)
2058 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
2063 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
2066 /* Convenience variables */
2067 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
2068 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
2069 sechdrs
[0].sh_addr
= 0;
2071 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2072 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
2073 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
2076 /* Mark all sections sh_addr with their address in the
2078 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
2080 /* Internal symbols and strings. */
2081 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2083 strindex
= sechdrs
[i
].sh_link
;
2084 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
2086 #ifndef CONFIG_MODULE_UNLOAD
2087 /* Don't load .exit sections */
2088 if (strstarts(secstrings
+sechdrs
[i
].sh_name
, ".exit"))
2089 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2093 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
2094 ".gnu.linkonce.this_module");
2096 printk(KERN_WARNING
"No module found in object\n");
2100 /* This is temporary: point mod into copy of data. */
2101 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2103 if (symindex
== 0) {
2104 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2110 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
2111 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
2112 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
2114 /* Don't keep modinfo and version sections. */
2115 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2116 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2118 /* Check module struct version now, before we try to use module. */
2119 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
2124 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2125 /* This is allowed: modprobe --force will invalidate it. */
2127 err
= try_to_force_load(mod
, "bad vermagic");
2130 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2131 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2132 mod
->name
, modmagic
, vermagic
);
2137 staging
= get_modinfo(sechdrs
, infoindex
, "staging");
2139 add_taint_module(mod
, TAINT_CRAP
);
2140 printk(KERN_WARNING
"%s: module is from the staging directory,"
2141 " the quality is unknown, you have been warned.\n",
2145 /* Now copy in args */
2146 args
= strndup_user(uargs
, ~0UL >> 1);
2148 err
= PTR_ERR(args
);
2152 strmap
= kzalloc(BITS_TO_LONGS(sechdrs
[strindex
].sh_size
)
2153 * sizeof(long), GFP_KERNEL
);
2159 if (find_module(mod
->name
)) {
2164 mod
->state
= MODULE_STATE_COMING
;
2166 /* Allow arches to frob section contents and sizes. */
2167 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2172 /* We have a special allocation for this section. */
2173 err
= percpu_modalloc(mod
, sechdrs
[pcpuindex
].sh_size
,
2174 sechdrs
[pcpuindex
].sh_addralign
);
2177 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2179 /* Keep this around for failure path. */
2180 percpu
= mod_percpu(mod
);
2182 /* Determine total sizes, and put offsets in sh_entsize. For now
2183 this is done generically; there doesn't appear to be any
2184 special cases for the architectures. */
2185 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2186 symoffs
= layout_symtab(mod
, sechdrs
, symindex
, strindex
, hdr
,
2187 secstrings
, &stroffs
, strmap
);
2189 /* Do the allocs. */
2190 ptr
= module_alloc_update_bounds(mod
->core_size
);
2192 * The pointer to this block is stored in the module structure
2193 * which is inside the block. Just mark it as not being a
2196 kmemleak_not_leak(ptr
);
2201 memset(ptr
, 0, mod
->core_size
);
2202 mod
->module_core
= ptr
;
2204 ptr
= module_alloc_update_bounds(mod
->init_size
);
2206 * The pointer to this block is stored in the module structure
2207 * which is inside the block. This block doesn't need to be
2208 * scanned as it contains data and code that will be freed
2209 * after the module is initialized.
2211 kmemleak_ignore(ptr
);
2212 if (!ptr
&& mod
->init_size
) {
2216 memset(ptr
, 0, mod
->init_size
);
2217 mod
->module_init
= ptr
;
2219 /* Transfer each section which specifies SHF_ALLOC */
2220 DEBUGP("final section addresses:\n");
2221 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2224 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2227 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2228 dest
= mod
->module_init
2229 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2231 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2233 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2234 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2235 sechdrs
[i
].sh_size
);
2236 /* Update sh_addr to point to copy in image. */
2237 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2238 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2240 /* Module has been moved. */
2241 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2242 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2244 #if defined(CONFIG_MODULE_UNLOAD)
2245 mod
->refptr
= alloc_percpu(struct module_ref
);
2251 /* Now we've moved module, initialize linked lists, etc. */
2252 module_unload_init(mod
);
2254 /* add kobject, so we can reference it. */
2255 err
= mod_sysfs_init(mod
);
2259 /* Set up license info based on the info section */
2260 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2263 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2264 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2265 * using GPL-only symbols it needs.
2267 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2268 add_taint(TAINT_PROPRIETARY_MODULE
);
2270 /* driverloader was caught wrongly pretending to be under GPL */
2271 if (strcmp(mod
->name
, "driverloader") == 0)
2272 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2274 /* Set up MODINFO_ATTR fields */
2275 setup_modinfo(mod
, sechdrs
, infoindex
);
2277 /* Fix up syms, so that st_value is a pointer to location. */
2278 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2283 /* Now we've got everything in the final locations, we can
2284 * find optional sections. */
2285 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2286 sizeof(*mod
->kp
), &mod
->num_kp
);
2287 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2288 sizeof(*mod
->syms
), &mod
->num_syms
);
2289 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2290 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2291 sizeof(*mod
->gpl_syms
),
2292 &mod
->num_gpl_syms
);
2293 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2294 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2295 "__ksymtab_gpl_future",
2296 sizeof(*mod
->gpl_future_syms
),
2297 &mod
->num_gpl_future_syms
);
2298 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2299 "__kcrctab_gpl_future");
2301 #ifdef CONFIG_UNUSED_SYMBOLS
2302 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2304 sizeof(*mod
->unused_syms
),
2305 &mod
->num_unused_syms
);
2306 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2307 "__kcrctab_unused");
2308 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2309 "__ksymtab_unused_gpl",
2310 sizeof(*mod
->unused_gpl_syms
),
2311 &mod
->num_unused_gpl_syms
);
2312 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2313 "__kcrctab_unused_gpl");
2315 #ifdef CONFIG_CONSTRUCTORS
2316 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2317 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2320 #ifdef CONFIG_TRACEPOINTS
2321 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2323 sizeof(*mod
->tracepoints
),
2324 &mod
->num_tracepoints
);
2326 #ifdef CONFIG_EVENT_TRACING
2327 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2329 sizeof(*mod
->trace_events
),
2330 &mod
->num_trace_events
);
2332 * This section contains pointers to allocated objects in the trace
2333 * code and not scanning it leads to false positives.
2335 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2336 mod
->num_trace_events
, GFP_KERNEL
);
2338 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2339 /* sechdrs[0].sh_size is always zero */
2340 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2342 sizeof(*mod
->ftrace_callsites
),
2343 &mod
->num_ftrace_callsites
);
2345 #ifdef CONFIG_MODVERSIONS
2346 if ((mod
->num_syms
&& !mod
->crcs
)
2347 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2348 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2349 #ifdef CONFIG_UNUSED_SYMBOLS
2350 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2351 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2354 err
= try_to_force_load(mod
,
2355 "no versions for exported symbols");
2361 /* Now do relocations. */
2362 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2363 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2364 unsigned int info
= sechdrs
[i
].sh_info
;
2366 /* Not a valid relocation section? */
2367 if (info
>= hdr
->e_shnum
)
2370 /* Don't bother with non-allocated sections */
2371 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2374 if (sechdrs
[i
].sh_type
== SHT_REL
)
2375 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2376 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2377 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2383 /* Find duplicate symbols */
2384 err
= verify_export_symbols(mod
);
2388 /* Set up and sort exception table */
2389 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2390 sizeof(*mod
->extable
), &mod
->num_exentries
);
2391 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2393 /* Finally, copy percpu area over. */
2394 percpu_modcopy(mod
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2395 sechdrs
[pcpuindex
].sh_size
);
2397 add_kallsyms(mod
, sechdrs
, hdr
->e_shnum
, symindex
, strindex
,
2398 symoffs
, stroffs
, secstrings
, strmap
);
2403 struct _ddebug
*debug
;
2404 unsigned int num_debug
;
2406 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2407 sizeof(*debug
), &num_debug
);
2409 dynamic_debug_setup(debug
, num_debug
);
2412 err
= module_finalize(hdr
, sechdrs
, mod
);
2416 /* flush the icache in correct context */
2421 * Flush the instruction cache, since we've played with text.
2422 * Do it before processing of module parameters, so the module
2423 * can provide parameter accessor functions of its own.
2425 if (mod
->module_init
)
2426 flush_icache_range((unsigned long)mod
->module_init
,
2427 (unsigned long)mod
->module_init
2429 flush_icache_range((unsigned long)mod
->module_core
,
2430 (unsigned long)mod
->module_core
+ mod
->core_size
);
2435 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2436 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2439 /* Now sew it into the lists so we can get lockdep and oops
2440 * info during argument parsing. Noone should access us, since
2441 * strong_try_module_get() will fail.
2442 * lockdep/oops can run asynchronous, so use the RCU list insertion
2443 * function to insert in a way safe to concurrent readers.
2444 * The mutex protects against concurrent writers.
2446 list_add_rcu(&mod
->list
, &modules
);
2448 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2452 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2455 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2456 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2458 /* Get rid of temporary copy */
2461 trace_module_load(mod
);
2467 /* Unlink carefully: kallsyms could be walking list. */
2468 list_del_rcu(&mod
->list
);
2469 synchronize_sched();
2470 module_arch_cleanup(mod
);
2473 kobject_del(&mod
->mkobj
.kobj
);
2474 kobject_put(&mod
->mkobj
.kobj
);
2476 module_unload_free(mod
);
2477 #if defined(CONFIG_MODULE_UNLOAD)
2478 free_percpu(mod
->refptr
);
2481 module_free(mod
, mod
->module_init
);
2483 module_free(mod
, mod
->module_core
);
2484 /* mod will be freed with core. Don't access it beyond this line! */
2486 free_percpu(percpu
);
2492 return ERR_PTR(err
);
2495 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2500 /* Call module constructors. */
2501 static void do_mod_ctors(struct module
*mod
)
2503 #ifdef CONFIG_CONSTRUCTORS
2506 for (i
= 0; i
< mod
->num_ctors
; i
++)
2511 /* This is where the real work happens */
2512 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2513 unsigned long, len
, const char __user
*, uargs
)
2518 /* Must have permission */
2519 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2522 /* Only one module load at a time, please */
2523 if (mutex_lock_interruptible(&module_mutex
) != 0)
2526 /* Do all the hard work */
2527 mod
= load_module(umod
, len
, uargs
);
2529 mutex_unlock(&module_mutex
);
2530 return PTR_ERR(mod
);
2533 /* Drop lock so they can recurse */
2534 mutex_unlock(&module_mutex
);
2536 blocking_notifier_call_chain(&module_notify_list
,
2537 MODULE_STATE_COMING
, mod
);
2540 /* Start the module */
2541 if (mod
->init
!= NULL
)
2542 ret
= do_one_initcall(mod
->init
);
2544 /* Init routine failed: abort. Try to protect us from
2545 buggy refcounters. */
2546 mod
->state
= MODULE_STATE_GOING
;
2547 synchronize_sched();
2549 blocking_notifier_call_chain(&module_notify_list
,
2550 MODULE_STATE_GOING
, mod
);
2551 mutex_lock(&module_mutex
);
2553 mutex_unlock(&module_mutex
);
2554 wake_up(&module_wq
);
2559 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2560 "%s: loading module anyway...\n",
2561 __func__
, mod
->name
, ret
,
2566 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2567 mod
->state
= MODULE_STATE_LIVE
;
2568 wake_up(&module_wq
);
2569 blocking_notifier_call_chain(&module_notify_list
,
2570 MODULE_STATE_LIVE
, mod
);
2572 /* We need to finish all async code before the module init sequence is done */
2573 async_synchronize_full();
2575 mutex_lock(&module_mutex
);
2576 /* Drop initial reference. */
2578 trim_init_extable(mod
);
2579 #ifdef CONFIG_KALLSYMS
2580 mod
->num_symtab
= mod
->core_num_syms
;
2581 mod
->symtab
= mod
->core_symtab
;
2582 mod
->strtab
= mod
->core_strtab
;
2584 module_free(mod
, mod
->module_init
);
2585 mod
->module_init
= NULL
;
2587 mod
->init_text_size
= 0;
2588 mutex_unlock(&module_mutex
);
2593 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2595 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2598 #ifdef CONFIG_KALLSYMS
2600 * This ignores the intensely annoying "mapping symbols" found
2601 * in ARM ELF files: $a, $t and $d.
2603 static inline int is_arm_mapping_symbol(const char *str
)
2605 return str
[0] == '$' && strchr("atd", str
[1])
2606 && (str
[2] == '\0' || str
[2] == '.');
2609 static const char *get_ksymbol(struct module
*mod
,
2611 unsigned long *size
,
2612 unsigned long *offset
)
2614 unsigned int i
, best
= 0;
2615 unsigned long nextval
;
2617 /* At worse, next value is at end of module */
2618 if (within_module_init(addr
, mod
))
2619 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2621 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2623 /* Scan for closest preceeding symbol, and next symbol. (ELF
2624 starts real symbols at 1). */
2625 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2626 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2629 /* We ignore unnamed symbols: they're uninformative
2630 * and inserted at a whim. */
2631 if (mod
->symtab
[i
].st_value
<= addr
2632 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2633 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2634 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2636 if (mod
->symtab
[i
].st_value
> addr
2637 && mod
->symtab
[i
].st_value
< nextval
2638 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2639 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2640 nextval
= mod
->symtab
[i
].st_value
;
2647 *size
= nextval
- mod
->symtab
[best
].st_value
;
2649 *offset
= addr
- mod
->symtab
[best
].st_value
;
2650 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2653 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2654 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2655 const char *module_address_lookup(unsigned long addr
,
2656 unsigned long *size
,
2657 unsigned long *offset
,
2662 const char *ret
= NULL
;
2665 list_for_each_entry_rcu(mod
, &modules
, list
) {
2666 if (within_module_init(addr
, mod
) ||
2667 within_module_core(addr
, mod
)) {
2669 *modname
= mod
->name
;
2670 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2674 /* Make a copy in here where it's safe */
2676 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2683 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2688 list_for_each_entry_rcu(mod
, &modules
, list
) {
2689 if (within_module_init(addr
, mod
) ||
2690 within_module_core(addr
, mod
)) {
2693 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2696 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2706 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2707 unsigned long *offset
, char *modname
, char *name
)
2712 list_for_each_entry_rcu(mod
, &modules
, list
) {
2713 if (within_module_init(addr
, mod
) ||
2714 within_module_core(addr
, mod
)) {
2717 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2721 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2723 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2733 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2734 char *name
, char *module_name
, int *exported
)
2739 list_for_each_entry_rcu(mod
, &modules
, list
) {
2740 if (symnum
< mod
->num_symtab
) {
2741 *value
= mod
->symtab
[symnum
].st_value
;
2742 *type
= mod
->symtab
[symnum
].st_info
;
2743 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2745 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2746 *exported
= is_exported(name
, *value
, mod
);
2750 symnum
-= mod
->num_symtab
;
2756 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2760 for (i
= 0; i
< mod
->num_symtab
; i
++)
2761 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2762 mod
->symtab
[i
].st_info
!= 'U')
2763 return mod
->symtab
[i
].st_value
;
2767 /* Look for this name: can be of form module:name. */
2768 unsigned long module_kallsyms_lookup_name(const char *name
)
2772 unsigned long ret
= 0;
2774 /* Don't lock: we're in enough trouble already. */
2776 if ((colon
= strchr(name
, ':')) != NULL
) {
2778 if ((mod
= find_module(name
)) != NULL
)
2779 ret
= mod_find_symname(mod
, colon
+1);
2782 list_for_each_entry_rcu(mod
, &modules
, list
)
2783 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2790 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2791 struct module
*, unsigned long),
2798 list_for_each_entry(mod
, &modules
, list
) {
2799 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2800 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2801 mod
, mod
->symtab
[i
].st_value
);
2808 #endif /* CONFIG_KALLSYMS */
2810 static char *module_flags(struct module
*mod
, char *buf
)
2815 mod
->state
== MODULE_STATE_GOING
||
2816 mod
->state
== MODULE_STATE_COMING
) {
2818 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2820 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2822 if (mod
->taints
& (1 << TAINT_CRAP
))
2825 * TAINT_FORCED_RMMOD: could be added.
2826 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2830 /* Show a - for module-is-being-unloaded */
2831 if (mod
->state
== MODULE_STATE_GOING
)
2833 /* Show a + for module-is-being-loaded */
2834 if (mod
->state
== MODULE_STATE_COMING
)
2843 #ifdef CONFIG_PROC_FS
2844 /* Called by the /proc file system to return a list of modules. */
2845 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2847 mutex_lock(&module_mutex
);
2848 return seq_list_start(&modules
, *pos
);
2851 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2853 return seq_list_next(p
, &modules
, pos
);
2856 static void m_stop(struct seq_file
*m
, void *p
)
2858 mutex_unlock(&module_mutex
);
2861 static int m_show(struct seq_file
*m
, void *p
)
2863 struct module
*mod
= list_entry(p
, struct module
, list
);
2866 seq_printf(m
, "%s %u",
2867 mod
->name
, mod
->init_size
+ mod
->core_size
);
2868 print_unload_info(m
, mod
);
2870 /* Informative for users. */
2871 seq_printf(m
, " %s",
2872 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2873 mod
->state
== MODULE_STATE_COMING
? "Loading":
2875 /* Used by oprofile and other similar tools. */
2876 seq_printf(m
, " 0x%p", mod
->module_core
);
2880 seq_printf(m
, " %s", module_flags(mod
, buf
));
2882 seq_printf(m
, "\n");
2886 /* Format: modulename size refcount deps address
2888 Where refcount is a number or -, and deps is a comma-separated list
2891 static const struct seq_operations modules_op
= {
2898 static int modules_open(struct inode
*inode
, struct file
*file
)
2900 return seq_open(file
, &modules_op
);
2903 static const struct file_operations proc_modules_operations
= {
2904 .open
= modules_open
,
2906 .llseek
= seq_lseek
,
2907 .release
= seq_release
,
2910 static int __init
proc_modules_init(void)
2912 proc_create("modules", 0, NULL
, &proc_modules_operations
);
2915 module_init(proc_modules_init
);
2918 /* Given an address, look for it in the module exception tables. */
2919 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2921 const struct exception_table_entry
*e
= NULL
;
2925 list_for_each_entry_rcu(mod
, &modules
, list
) {
2926 if (mod
->num_exentries
== 0)
2929 e
= search_extable(mod
->extable
,
2930 mod
->extable
+ mod
->num_exentries
- 1,
2937 /* Now, if we found one, we are running inside it now, hence
2938 we cannot unload the module, hence no refcnt needed. */
2943 * is_module_address - is this address inside a module?
2944 * @addr: the address to check.
2946 * See is_module_text_address() if you simply want to see if the address
2947 * is code (not data).
2949 bool is_module_address(unsigned long addr
)
2954 ret
= __module_address(addr
) != NULL
;
2961 * __module_address - get the module which contains an address.
2962 * @addr: the address.
2964 * Must be called with preempt disabled or module mutex held so that
2965 * module doesn't get freed during this.
2967 struct module
*__module_address(unsigned long addr
)
2971 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2974 list_for_each_entry_rcu(mod
, &modules
, list
)
2975 if (within_module_core(addr
, mod
)
2976 || within_module_init(addr
, mod
))
2980 EXPORT_SYMBOL_GPL(__module_address
);
2983 * is_module_text_address - is this address inside module code?
2984 * @addr: the address to check.
2986 * See is_module_address() if you simply want to see if the address is
2987 * anywhere in a module. See kernel_text_address() for testing if an
2988 * address corresponds to kernel or module code.
2990 bool is_module_text_address(unsigned long addr
)
2995 ret
= __module_text_address(addr
) != NULL
;
3002 * __module_text_address - get the module whose code contains an address.
3003 * @addr: the address.
3005 * Must be called with preempt disabled or module mutex held so that
3006 * module doesn't get freed during this.
3008 struct module
*__module_text_address(unsigned long addr
)
3010 struct module
*mod
= __module_address(addr
);
3012 /* Make sure it's within the text section. */
3013 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3014 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3019 EXPORT_SYMBOL_GPL(__module_text_address
);
3021 /* Don't grab lock, we're oopsing. */
3022 void print_modules(void)
3027 printk(KERN_DEFAULT
"Modules linked in:");
3028 /* Most callers should already have preempt disabled, but make sure */
3030 list_for_each_entry_rcu(mod
, &modules
, list
)
3031 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3033 if (last_unloaded_module
[0])
3034 printk(" [last unloaded: %s]", last_unloaded_module
);
3038 #ifdef CONFIG_MODVERSIONS
3039 /* Generate the signature for all relevant module structures here.
3040 * If these change, we don't want to try to parse the module. */
3041 void module_layout(struct module
*mod
,
3042 struct modversion_info
*ver
,
3043 struct kernel_param
*kp
,
3044 struct kernel_symbol
*ks
,
3045 struct tracepoint
*tp
)
3048 EXPORT_SYMBOL(module_layout
);
3051 #ifdef CONFIG_TRACEPOINTS
3052 void module_update_tracepoints(void)
3056 mutex_lock(&module_mutex
);
3057 list_for_each_entry(mod
, &modules
, list
)
3059 tracepoint_update_probe_range(mod
->tracepoints
,
3060 mod
->tracepoints
+ mod
->num_tracepoints
);
3061 mutex_unlock(&module_mutex
);
3065 * Returns 0 if current not found.
3066 * Returns 1 if current found.
3068 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
3070 struct module
*iter_mod
;
3073 mutex_lock(&module_mutex
);
3074 list_for_each_entry(iter_mod
, &modules
, list
) {
3075 if (!iter_mod
->taints
) {
3077 * Sorted module list
3079 if (iter_mod
< iter
->module
)
3081 else if (iter_mod
> iter
->module
)
3082 iter
->tracepoint
= NULL
;
3083 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
3084 iter_mod
->tracepoints
,
3085 iter_mod
->tracepoints
3086 + iter_mod
->num_tracepoints
);
3088 iter
->module
= iter_mod
;
3093 mutex_unlock(&module_mutex
);