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 /* Does a already use b? */
540 static int already_uses(struct module
*a
, struct module
*b
)
542 struct module_use
*use
;
544 list_for_each_entry(use
, &b
->source_list
, source_list
) {
545 if (use
->source
== a
) {
546 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
550 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
556 * - we add 'a' as a "source", 'b' as a "target" of module use
557 * - the module_use is added to the list of 'b' sources (so
558 * 'b' can walk the list to see who sourced them), and of 'a'
559 * targets (so 'a' can see what modules it targets).
561 static int add_module_usage(struct module
*a
, struct module
*b
)
564 struct module_use
*use
;
566 DEBUGP("Allocating new usage for %s.\n", a
->name
);
567 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
569 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
575 list_add(&use
->source_list
, &b
->source_list
);
576 list_add(&use
->target_list
, &a
->target_list
);
577 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
581 /* Module a uses b */
582 int use_module(struct module
*a
, struct module
*b
)
586 if (b
== NULL
|| already_uses(a
, b
)) return 1;
588 /* If we're interrupted or time out, we fail. */
589 if (wait_event_interruptible_timeout(
590 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
592 printk("%s: gave up waiting for init of module %s.\n",
597 /* If strong_try_module_get() returned a different error, we fail. */
601 err
= add_module_usage(a
, b
);
608 EXPORT_SYMBOL_GPL(use_module
);
610 /* Clear the unload stuff of the module. */
611 static void module_unload_free(struct module
*mod
)
613 struct module_use
*use
, *tmp
;
615 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
616 struct module
*i
= use
->target
;
617 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
619 list_del(&use
->source_list
);
620 list_del(&use
->target_list
);
622 sysfs_remove_link(i
->holders_dir
, mod
->name
);
626 #ifdef CONFIG_MODULE_FORCE_UNLOAD
627 static inline int try_force_unload(unsigned int flags
)
629 int ret
= (flags
& O_TRUNC
);
631 add_taint(TAINT_FORCED_RMMOD
);
635 static inline int try_force_unload(unsigned int flags
)
639 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
648 /* Whole machine is stopped with interrupts off when this runs. */
649 static int __try_stop_module(void *_sref
)
651 struct stopref
*sref
= _sref
;
653 /* If it's not unused, quit unless we're forcing. */
654 if (module_refcount(sref
->mod
) != 0) {
655 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
659 /* Mark it as dying. */
660 sref
->mod
->state
= MODULE_STATE_GOING
;
664 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
666 if (flags
& O_NONBLOCK
) {
667 struct stopref sref
= { mod
, flags
, forced
};
669 return stop_machine(__try_stop_module
, &sref
, NULL
);
671 /* We don't need to stop the machine for this. */
672 mod
->state
= MODULE_STATE_GOING
;
678 unsigned int module_refcount(struct module
*mod
)
680 unsigned int incs
= 0, decs
= 0;
683 for_each_possible_cpu(cpu
)
684 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
686 * ensure the incs are added up after the decs.
687 * module_put ensures incs are visible before decs with smp_wmb.
689 * This 2-count scheme avoids the situation where the refcount
690 * for CPU0 is read, then CPU0 increments the module refcount,
691 * then CPU1 drops that refcount, then the refcount for CPU1 is
692 * read. We would record a decrement but not its corresponding
693 * increment so we would see a low count (disaster).
695 * Rare situation? But module_refcount can be preempted, and we
696 * might be tallying up 4096+ CPUs. So it is not impossible.
699 for_each_possible_cpu(cpu
)
700 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
703 EXPORT_SYMBOL(module_refcount
);
705 /* This exists whether we can unload or not */
706 static void free_module(struct module
*mod
);
708 static void wait_for_zero_refcount(struct module
*mod
)
710 /* Since we might sleep for some time, release the mutex first */
711 mutex_unlock(&module_mutex
);
713 DEBUGP("Looking at refcount...\n");
714 set_current_state(TASK_UNINTERRUPTIBLE
);
715 if (module_refcount(mod
) == 0)
719 current
->state
= TASK_RUNNING
;
720 mutex_lock(&module_mutex
);
723 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
727 char name
[MODULE_NAME_LEN
];
730 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
733 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
735 name
[MODULE_NAME_LEN
-1] = '\0';
737 if (mutex_lock_interruptible(&module_mutex
) != 0)
740 mod
= find_module(name
);
746 if (!list_empty(&mod
->source_list
)) {
747 /* Other modules depend on us: get rid of them first. */
752 /* Doing init or already dying? */
753 if (mod
->state
!= MODULE_STATE_LIVE
) {
754 /* FIXME: if (force), slam module count and wake up
756 DEBUGP("%s already dying\n", mod
->name
);
761 /* If it has an init func, it must have an exit func to unload */
762 if (mod
->init
&& !mod
->exit
) {
763 forced
= try_force_unload(flags
);
765 /* This module can't be removed */
771 /* Set this up before setting mod->state */
772 mod
->waiter
= current
;
774 /* Stop the machine so refcounts can't move and disable module. */
775 ret
= try_stop_module(mod
, flags
, &forced
);
779 /* Never wait if forced. */
780 if (!forced
&& module_refcount(mod
) != 0)
781 wait_for_zero_refcount(mod
);
783 mutex_unlock(&module_mutex
);
784 /* Final destruction now noone is using it. */
785 if (mod
->exit
!= NULL
)
787 blocking_notifier_call_chain(&module_notify_list
,
788 MODULE_STATE_GOING
, mod
);
789 async_synchronize_full();
790 mutex_lock(&module_mutex
);
791 /* Store the name of the last unloaded module for diagnostic purposes */
792 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
793 ddebug_remove_module(mod
->name
);
797 mutex_unlock(&module_mutex
);
801 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
803 struct module_use
*use
;
804 int printed_something
= 0;
806 seq_printf(m
, " %u ", module_refcount(mod
));
808 /* Always include a trailing , so userspace can differentiate
809 between this and the old multi-field proc format. */
810 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
811 printed_something
= 1;
812 seq_printf(m
, "%s,", use
->source
->name
);
815 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
816 printed_something
= 1;
817 seq_printf(m
, "[permanent],");
820 if (!printed_something
)
824 void __symbol_put(const char *symbol
)
826 struct module
*owner
;
829 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
834 EXPORT_SYMBOL(__symbol_put
);
836 /* Note this assumes addr is a function, which it currently always is. */
837 void symbol_put_addr(void *addr
)
839 struct module
*modaddr
;
840 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
842 if (core_kernel_text(a
))
845 /* module_text_address is safe here: we're supposed to have reference
846 * to module from symbol_get, so it can't go away. */
847 modaddr
= __module_text_address(a
);
851 EXPORT_SYMBOL_GPL(symbol_put_addr
);
853 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
854 struct module
*mod
, char *buffer
)
856 return sprintf(buffer
, "%u\n", module_refcount(mod
));
859 static struct module_attribute refcnt
= {
860 .attr
= { .name
= "refcnt", .mode
= 0444 },
864 void module_put(struct module
*module
)
868 smp_wmb(); /* see comment in module_refcount */
869 __this_cpu_inc(module
->refptr
->decs
);
871 trace_module_put(module
, _RET_IP_
);
872 /* Maybe they're waiting for us to drop reference? */
873 if (unlikely(!module_is_live(module
)))
874 wake_up_process(module
->waiter
);
878 EXPORT_SYMBOL(module_put
);
880 #else /* !CONFIG_MODULE_UNLOAD */
881 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
883 /* We don't know the usage count, or what modules are using. */
884 seq_printf(m
, " - -");
887 static inline void module_unload_free(struct module
*mod
)
891 int use_module(struct module
*a
, struct module
*b
)
893 return strong_try_module_get(b
) == 0;
895 EXPORT_SYMBOL_GPL(use_module
);
897 static inline void module_unload_init(struct module
*mod
)
900 #endif /* CONFIG_MODULE_UNLOAD */
902 static ssize_t
show_initstate(struct module_attribute
*mattr
,
903 struct module
*mod
, char *buffer
)
905 const char *state
= "unknown";
907 switch (mod
->state
) {
908 case MODULE_STATE_LIVE
:
911 case MODULE_STATE_COMING
:
914 case MODULE_STATE_GOING
:
918 return sprintf(buffer
, "%s\n", state
);
921 static struct module_attribute initstate
= {
922 .attr
= { .name
= "initstate", .mode
= 0444 },
923 .show
= show_initstate
,
926 static struct module_attribute
*modinfo_attrs
[] = {
930 #ifdef CONFIG_MODULE_UNLOAD
936 static const char vermagic
[] = VERMAGIC_STRING
;
938 static int try_to_force_load(struct module
*mod
, const char *reason
)
940 #ifdef CONFIG_MODULE_FORCE_LOAD
941 if (!test_taint(TAINT_FORCED_MODULE
))
942 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
944 add_taint_module(mod
, TAINT_FORCED_MODULE
);
951 #ifdef CONFIG_MODVERSIONS
952 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
953 static unsigned long maybe_relocated(unsigned long crc
,
954 const struct module
*crc_owner
)
956 #ifdef ARCH_RELOCATES_KCRCTAB
957 if (crc_owner
== NULL
)
958 return crc
- (unsigned long)reloc_start
;
963 static int check_version(Elf_Shdr
*sechdrs
,
964 unsigned int versindex
,
967 const unsigned long *crc
,
968 const struct module
*crc_owner
)
970 unsigned int i
, num_versions
;
971 struct modversion_info
*versions
;
973 /* Exporting module didn't supply crcs? OK, we're already tainted. */
977 /* No versions at all? modprobe --force does this. */
979 return try_to_force_load(mod
, symname
) == 0;
981 versions
= (void *) sechdrs
[versindex
].sh_addr
;
982 num_versions
= sechdrs
[versindex
].sh_size
983 / sizeof(struct modversion_info
);
985 for (i
= 0; i
< num_versions
; i
++) {
986 if (strcmp(versions
[i
].name
, symname
) != 0)
989 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
991 DEBUGP("Found checksum %lX vs module %lX\n",
992 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
996 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1001 printk("%s: disagrees about version of symbol %s\n",
1002 mod
->name
, symname
);
1006 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1007 unsigned int versindex
,
1010 const unsigned long *crc
;
1012 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1015 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1019 /* First part is kernel version, which we ignore if module has crcs. */
1020 static inline int same_magic(const char *amagic
, const char *bmagic
,
1024 amagic
+= strcspn(amagic
, " ");
1025 bmagic
+= strcspn(bmagic
, " ");
1027 return strcmp(amagic
, bmagic
) == 0;
1030 static inline int check_version(Elf_Shdr
*sechdrs
,
1031 unsigned int versindex
,
1032 const char *symname
,
1034 const unsigned long *crc
,
1035 const struct module
*crc_owner
)
1040 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1041 unsigned int versindex
,
1047 static inline int same_magic(const char *amagic
, const char *bmagic
,
1050 return strcmp(amagic
, bmagic
) == 0;
1052 #endif /* CONFIG_MODVERSIONS */
1054 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1055 Must be holding module_mutex. */
1056 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1057 unsigned int versindex
,
1061 struct module
*owner
;
1062 const struct kernel_symbol
*sym
;
1063 const unsigned long *crc
;
1065 sym
= find_symbol(name
, &owner
, &crc
,
1066 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1067 /* use_module can fail due to OOM,
1068 or module initialization or unloading */
1070 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
, owner
)
1071 || !use_module(mod
, owner
))
1078 * /sys/module/foo/sections stuff
1079 * J. Corbet <corbet@lwn.net>
1081 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1083 static inline bool sect_empty(const Elf_Shdr
*sect
)
1085 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1088 struct module_sect_attr
1090 struct module_attribute mattr
;
1092 unsigned long address
;
1095 struct module_sect_attrs
1097 struct attribute_group grp
;
1098 unsigned int nsections
;
1099 struct module_sect_attr attrs
[0];
1102 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1103 struct module
*mod
, char *buf
)
1105 struct module_sect_attr
*sattr
=
1106 container_of(mattr
, struct module_sect_attr
, mattr
);
1107 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1110 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1112 unsigned int section
;
1114 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1115 kfree(sect_attrs
->attrs
[section
].name
);
1119 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1120 char *secstrings
, Elf_Shdr
*sechdrs
)
1122 unsigned int nloaded
= 0, i
, size
[2];
1123 struct module_sect_attrs
*sect_attrs
;
1124 struct module_sect_attr
*sattr
;
1125 struct attribute
**gattr
;
1127 /* Count loaded sections and allocate structures */
1128 for (i
= 0; i
< nsect
; i
++)
1129 if (!sect_empty(&sechdrs
[i
]))
1131 size
[0] = ALIGN(sizeof(*sect_attrs
)
1132 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1133 sizeof(sect_attrs
->grp
.attrs
[0]));
1134 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1135 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1136 if (sect_attrs
== NULL
)
1139 /* Setup section attributes. */
1140 sect_attrs
->grp
.name
= "sections";
1141 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1143 sect_attrs
->nsections
= 0;
1144 sattr
= §_attrs
->attrs
[0];
1145 gattr
= §_attrs
->grp
.attrs
[0];
1146 for (i
= 0; i
< nsect
; i
++) {
1147 if (sect_empty(&sechdrs
[i
]))
1149 sattr
->address
= sechdrs
[i
].sh_addr
;
1150 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1152 if (sattr
->name
== NULL
)
1154 sect_attrs
->nsections
++;
1155 sysfs_attr_init(&sattr
->mattr
.attr
);
1156 sattr
->mattr
.show
= module_sect_show
;
1157 sattr
->mattr
.store
= NULL
;
1158 sattr
->mattr
.attr
.name
= sattr
->name
;
1159 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1160 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1164 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1167 mod
->sect_attrs
= sect_attrs
;
1170 free_sect_attrs(sect_attrs
);
1173 static void remove_sect_attrs(struct module
*mod
)
1175 if (mod
->sect_attrs
) {
1176 sysfs_remove_group(&mod
->mkobj
.kobj
,
1177 &mod
->sect_attrs
->grp
);
1178 /* We are positive that no one is using any sect attrs
1179 * at this point. Deallocate immediately. */
1180 free_sect_attrs(mod
->sect_attrs
);
1181 mod
->sect_attrs
= NULL
;
1186 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1189 struct module_notes_attrs
{
1190 struct kobject
*dir
;
1192 struct bin_attribute attrs
[0];
1195 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1196 struct bin_attribute
*bin_attr
,
1197 char *buf
, loff_t pos
, size_t count
)
1200 * The caller checked the pos and count against our size.
1202 memcpy(buf
, bin_attr
->private + pos
, count
);
1206 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1209 if (notes_attrs
->dir
) {
1211 sysfs_remove_bin_file(notes_attrs
->dir
,
1212 ¬es_attrs
->attrs
[i
]);
1213 kobject_put(notes_attrs
->dir
);
1218 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1219 char *secstrings
, Elf_Shdr
*sechdrs
)
1221 unsigned int notes
, loaded
, i
;
1222 struct module_notes_attrs
*notes_attrs
;
1223 struct bin_attribute
*nattr
;
1225 /* failed to create section attributes, so can't create notes */
1226 if (!mod
->sect_attrs
)
1229 /* Count notes sections and allocate structures. */
1231 for (i
= 0; i
< nsect
; i
++)
1232 if (!sect_empty(&sechdrs
[i
]) &&
1233 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1239 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1240 + notes
* sizeof(notes_attrs
->attrs
[0]),
1242 if (notes_attrs
== NULL
)
1245 notes_attrs
->notes
= notes
;
1246 nattr
= ¬es_attrs
->attrs
[0];
1247 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1248 if (sect_empty(&sechdrs
[i
]))
1250 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1251 sysfs_bin_attr_init(nattr
);
1252 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1253 nattr
->attr
.mode
= S_IRUGO
;
1254 nattr
->size
= sechdrs
[i
].sh_size
;
1255 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1256 nattr
->read
= module_notes_read
;
1262 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1263 if (!notes_attrs
->dir
)
1266 for (i
= 0; i
< notes
; ++i
)
1267 if (sysfs_create_bin_file(notes_attrs
->dir
,
1268 ¬es_attrs
->attrs
[i
]))
1271 mod
->notes_attrs
= notes_attrs
;
1275 free_notes_attrs(notes_attrs
, i
);
1278 static void remove_notes_attrs(struct module
*mod
)
1280 if (mod
->notes_attrs
)
1281 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1286 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1287 char *sectstrings
, Elf_Shdr
*sechdrs
)
1291 static inline void remove_sect_attrs(struct module
*mod
)
1295 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1296 char *sectstrings
, Elf_Shdr
*sechdrs
)
1300 static inline void remove_notes_attrs(struct module
*mod
)
1306 int module_add_modinfo_attrs(struct module
*mod
)
1308 struct module_attribute
*attr
;
1309 struct module_attribute
*temp_attr
;
1313 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1314 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1316 if (!mod
->modinfo_attrs
)
1319 temp_attr
= mod
->modinfo_attrs
;
1320 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1322 (attr
->test
&& attr
->test(mod
))) {
1323 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1324 sysfs_attr_init(&temp_attr
->attr
);
1325 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1332 void module_remove_modinfo_attrs(struct module
*mod
)
1334 struct module_attribute
*attr
;
1337 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1338 /* pick a field to test for end of list */
1339 if (!attr
->attr
.name
)
1341 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1345 kfree(mod
->modinfo_attrs
);
1348 int mod_sysfs_init(struct module
*mod
)
1351 struct kobject
*kobj
;
1353 if (!module_sysfs_initialized
) {
1354 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1360 kobj
= kset_find_obj(module_kset
, mod
->name
);
1362 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1368 mod
->mkobj
.mod
= mod
;
1370 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1371 mod
->mkobj
.kobj
.kset
= module_kset
;
1372 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1375 kobject_put(&mod
->mkobj
.kobj
);
1377 /* delay uevent until full sysfs population */
1382 int mod_sysfs_setup(struct module
*mod
,
1383 struct kernel_param
*kparam
,
1384 unsigned int num_params
)
1388 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1389 if (!mod
->holders_dir
) {
1394 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1396 goto out_unreg_holders
;
1398 err
= module_add_modinfo_attrs(mod
);
1400 goto out_unreg_param
;
1402 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1406 module_param_sysfs_remove(mod
);
1408 kobject_put(mod
->holders_dir
);
1410 kobject_put(&mod
->mkobj
.kobj
);
1414 static void mod_sysfs_fini(struct module
*mod
)
1416 kobject_put(&mod
->mkobj
.kobj
);
1419 #else /* CONFIG_SYSFS */
1421 static void mod_sysfs_fini(struct module
*mod
)
1425 #endif /* CONFIG_SYSFS */
1427 static void mod_kobject_remove(struct module
*mod
)
1429 module_remove_modinfo_attrs(mod
);
1430 module_param_sysfs_remove(mod
);
1431 kobject_put(mod
->mkobj
.drivers_dir
);
1432 kobject_put(mod
->holders_dir
);
1433 mod_sysfs_fini(mod
);
1437 * unlink the module with the whole machine is stopped with interrupts off
1438 * - this defends against kallsyms not taking locks
1440 static int __unlink_module(void *_mod
)
1442 struct module
*mod
= _mod
;
1443 list_del(&mod
->list
);
1447 /* Free a module, remove from lists, etc (must hold module_mutex). */
1448 static void free_module(struct module
*mod
)
1450 trace_module_free(mod
);
1452 /* Delete from various lists */
1453 stop_machine(__unlink_module
, mod
, NULL
);
1454 remove_notes_attrs(mod
);
1455 remove_sect_attrs(mod
);
1456 mod_kobject_remove(mod
);
1458 /* Arch-specific cleanup. */
1459 module_arch_cleanup(mod
);
1461 /* Module unload stuff */
1462 module_unload_free(mod
);
1464 /* Free any allocated parameters. */
1465 destroy_params(mod
->kp
, mod
->num_kp
);
1467 /* This may be NULL, but that's OK */
1468 module_free(mod
, mod
->module_init
);
1470 percpu_modfree(mod
);
1471 #if defined(CONFIG_MODULE_UNLOAD)
1473 free_percpu(mod
->refptr
);
1475 /* Free lock-classes: */
1476 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1478 /* Finally, free the core (containing the module structure) */
1479 module_free(mod
, mod
->module_core
);
1482 update_protections(current
->mm
);
1486 void *__symbol_get(const char *symbol
)
1488 struct module
*owner
;
1489 const struct kernel_symbol
*sym
;
1492 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1493 if (sym
&& strong_try_module_get(owner
))
1497 return sym
? (void *)sym
->value
: NULL
;
1499 EXPORT_SYMBOL_GPL(__symbol_get
);
1502 * Ensure that an exported symbol [global namespace] does not already exist
1503 * in the kernel or in some other module's exported symbol table.
1505 static int verify_export_symbols(struct module
*mod
)
1508 struct module
*owner
;
1509 const struct kernel_symbol
*s
;
1511 const struct kernel_symbol
*sym
;
1514 { mod
->syms
, mod
->num_syms
},
1515 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1516 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1517 #ifdef CONFIG_UNUSED_SYMBOLS
1518 { mod
->unused_syms
, mod
->num_unused_syms
},
1519 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1523 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1524 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1525 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1527 "%s: exports duplicate symbol %s"
1529 mod
->name
, s
->name
, module_name(owner
));
1537 /* Change all symbols so that st_value encodes the pointer directly. */
1538 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1539 unsigned int symindex
,
1541 unsigned int versindex
,
1542 unsigned int pcpuindex
,
1545 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1546 unsigned long secbase
;
1547 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1549 const struct kernel_symbol
*ksym
;
1551 for (i
= 1; i
< n
; i
++) {
1552 switch (sym
[i
].st_shndx
) {
1554 /* We compiled with -fno-common. These are not
1555 supposed to happen. */
1556 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1557 printk("%s: please compile with -fno-common\n",
1563 /* Don't need to do anything */
1564 DEBUGP("Absolute symbol: 0x%08lx\n",
1565 (long)sym
[i
].st_value
);
1569 ksym
= resolve_symbol(sechdrs
, versindex
,
1570 strtab
+ sym
[i
].st_name
, mod
);
1571 /* Ok if resolved. */
1573 sym
[i
].st_value
= ksym
->value
;
1578 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1581 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1582 mod
->name
, strtab
+ sym
[i
].st_name
);
1587 /* Divert to percpu allocation if a percpu var. */
1588 if (sym
[i
].st_shndx
== pcpuindex
)
1589 secbase
= (unsigned long)mod_percpu(mod
);
1591 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1592 sym
[i
].st_value
+= secbase
;
1600 /* Additional bytes needed by arch in front of individual sections */
1601 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1602 unsigned int section
)
1604 /* default implementation just returns zero */
1608 /* Update size with this section: return offset. */
1609 static long get_offset(struct module
*mod
, unsigned int *size
,
1610 Elf_Shdr
*sechdr
, unsigned int section
)
1614 *size
+= arch_mod_section_prepend(mod
, section
);
1615 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1616 *size
= ret
+ sechdr
->sh_size
;
1620 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1621 might -- code, read-only data, read-write data, small data. Tally
1622 sizes, and place the offsets into sh_entsize fields: high bit means it
1624 static void layout_sections(struct module
*mod
,
1625 const Elf_Ehdr
*hdr
,
1627 const char *secstrings
)
1629 static unsigned long const masks
[][2] = {
1630 /* NOTE: all executable code must be the first section
1631 * in this array; otherwise modify the text_size
1632 * finder in the two loops below */
1633 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1634 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1635 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1636 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1640 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1641 sechdrs
[i
].sh_entsize
= ~0UL;
1643 DEBUGP("Core section allocation order:\n");
1644 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1645 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1646 Elf_Shdr
*s
= &sechdrs
[i
];
1648 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1649 || (s
->sh_flags
& masks
[m
][1])
1650 || s
->sh_entsize
!= ~0UL
1651 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1653 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1654 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1657 mod
->core_text_size
= mod
->core_size
;
1660 DEBUGP("Init section allocation order:\n");
1661 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1662 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1663 Elf_Shdr
*s
= &sechdrs
[i
];
1665 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1666 || (s
->sh_flags
& masks
[m
][1])
1667 || s
->sh_entsize
!= ~0UL
1668 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1670 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1671 | INIT_OFFSET_MASK
);
1672 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1675 mod
->init_text_size
= mod
->init_size
;
1679 static void set_license(struct module
*mod
, const char *license
)
1682 license
= "unspecified";
1684 if (!license_is_gpl_compatible(license
)) {
1685 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1686 printk(KERN_WARNING
"%s: module license '%s' taints "
1687 "kernel.\n", mod
->name
, license
);
1688 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1692 /* Parse tag=value strings from .modinfo section */
1693 static char *next_string(char *string
, unsigned long *secsize
)
1695 /* Skip non-zero chars */
1698 if ((*secsize
)-- <= 1)
1702 /* Skip any zero padding. */
1703 while (!string
[0]) {
1705 if ((*secsize
)-- <= 1)
1711 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1716 unsigned int taglen
= strlen(tag
);
1717 unsigned long size
= sechdrs
[info
].sh_size
;
1719 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1720 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1721 return p
+ taglen
+ 1;
1726 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1727 unsigned int infoindex
)
1729 struct module_attribute
*attr
;
1732 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1735 get_modinfo(sechdrs
,
1741 static void free_modinfo(struct module
*mod
)
1743 struct module_attribute
*attr
;
1746 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1752 #ifdef CONFIG_KALLSYMS
1754 /* lookup symbol in given range of kernel_symbols */
1755 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1756 const struct kernel_symbol
*start
,
1757 const struct kernel_symbol
*stop
)
1759 const struct kernel_symbol
*ks
= start
;
1760 for (; ks
< stop
; ks
++)
1761 if (strcmp(ks
->name
, name
) == 0)
1766 static int is_exported(const char *name
, unsigned long value
,
1767 const struct module
*mod
)
1769 const struct kernel_symbol
*ks
;
1771 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1773 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1774 return ks
!= NULL
&& ks
->value
== value
;
1778 static char elf_type(const Elf_Sym
*sym
,
1780 const char *secstrings
,
1783 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1784 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1789 if (sym
->st_shndx
== SHN_UNDEF
)
1791 if (sym
->st_shndx
== SHN_ABS
)
1793 if (sym
->st_shndx
>= SHN_LORESERVE
)
1795 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1797 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1798 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1799 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1801 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1806 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1807 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1812 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1817 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
1820 const Elf_Shdr
*sec
;
1822 if (src
->st_shndx
== SHN_UNDEF
1823 || src
->st_shndx
>= shnum
1827 sec
= sechdrs
+ src
->st_shndx
;
1828 if (!(sec
->sh_flags
& SHF_ALLOC
)
1829 #ifndef CONFIG_KALLSYMS_ALL
1830 || !(sec
->sh_flags
& SHF_EXECINSTR
)
1832 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
1838 static unsigned long layout_symtab(struct module
*mod
,
1840 unsigned int symindex
,
1841 unsigned int strindex
,
1842 const Elf_Ehdr
*hdr
,
1843 const char *secstrings
,
1844 unsigned long *pstroffs
,
1845 unsigned long *strmap
)
1847 unsigned long symoffs
;
1848 Elf_Shdr
*symsect
= sechdrs
+ symindex
;
1849 Elf_Shdr
*strsect
= sechdrs
+ strindex
;
1852 unsigned int i
, nsrc
, ndst
;
1854 /* Put symbol section at end of init part of module. */
1855 symsect
->sh_flags
|= SHF_ALLOC
;
1856 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
1857 symindex
) | INIT_OFFSET_MASK
;
1858 DEBUGP("\t%s\n", secstrings
+ symsect
->sh_name
);
1860 src
= (void *)hdr
+ symsect
->sh_offset
;
1861 nsrc
= symsect
->sh_size
/ sizeof(*src
);
1862 strtab
= (void *)hdr
+ strsect
->sh_offset
;
1863 for (ndst
= i
= 1; i
< nsrc
; ++i
, ++src
)
1864 if (is_core_symbol(src
, sechdrs
, hdr
->e_shnum
)) {
1865 unsigned int j
= src
->st_name
;
1867 while(!__test_and_set_bit(j
, strmap
) && strtab
[j
])
1872 /* Append room for core symbols at end of core part. */
1873 symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
1874 mod
->core_size
= symoffs
+ ndst
* sizeof(Elf_Sym
);
1876 /* Put string table section at end of init part of module. */
1877 strsect
->sh_flags
|= SHF_ALLOC
;
1878 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
1879 strindex
) | INIT_OFFSET_MASK
;
1880 DEBUGP("\t%s\n", secstrings
+ strsect
->sh_name
);
1882 /* Append room for core symbols' strings at end of core part. */
1883 *pstroffs
= mod
->core_size
;
1884 __set_bit(0, strmap
);
1885 mod
->core_size
+= bitmap_weight(strmap
, strsect
->sh_size
);
1890 static void add_kallsyms(struct module
*mod
,
1893 unsigned int symindex
,
1894 unsigned int strindex
,
1895 unsigned long symoffs
,
1896 unsigned long stroffs
,
1897 const char *secstrings
,
1898 unsigned long *strmap
)
1900 unsigned int i
, ndst
;
1905 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1906 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1907 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1909 /* Set types up while we still have access to sections. */
1910 for (i
= 0; i
< mod
->num_symtab
; i
++)
1911 mod
->symtab
[i
].st_info
1912 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1914 mod
->core_symtab
= dst
= mod
->module_core
+ symoffs
;
1917 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
1918 if (!is_core_symbol(src
, sechdrs
, shnum
))
1921 dst
[ndst
].st_name
= bitmap_weight(strmap
, dst
[ndst
].st_name
);
1924 mod
->core_num_syms
= ndst
;
1926 mod
->core_strtab
= s
= mod
->module_core
+ stroffs
;
1927 for (*s
= 0, i
= 1; i
< sechdrs
[strindex
].sh_size
; ++i
)
1928 if (test_bit(i
, strmap
))
1929 *++s
= mod
->strtab
[i
];
1932 static inline unsigned long layout_symtab(struct module
*mod
,
1934 unsigned int symindex
,
1935 unsigned int strindex
,
1936 const Elf_Ehdr
*hdr
,
1937 const char *secstrings
,
1938 unsigned long *pstroffs
,
1939 unsigned long *strmap
)
1944 static inline void add_kallsyms(struct module
*mod
,
1947 unsigned int symindex
,
1948 unsigned int strindex
,
1949 unsigned long symoffs
,
1950 unsigned long stroffs
,
1951 const char *secstrings
,
1952 const unsigned long *strmap
)
1955 #endif /* CONFIG_KALLSYMS */
1957 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
1959 #ifdef CONFIG_DYNAMIC_DEBUG
1960 if (ddebug_add_module(debug
, num
, debug
->modname
))
1961 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
1966 static void *module_alloc_update_bounds(unsigned long size
)
1968 void *ret
= module_alloc(size
);
1971 /* Update module bounds. */
1972 if ((unsigned long)ret
< module_addr_min
)
1973 module_addr_min
= (unsigned long)ret
;
1974 if ((unsigned long)ret
+ size
> module_addr_max
)
1975 module_addr_max
= (unsigned long)ret
+ size
;
1980 #ifdef CONFIG_DEBUG_KMEMLEAK
1981 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1982 Elf_Shdr
*sechdrs
, char *secstrings
)
1986 /* only scan the sections containing data */
1987 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
1989 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1990 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1992 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
1993 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
1996 kmemleak_scan_area((void *)sechdrs
[i
].sh_addr
,
1997 sechdrs
[i
].sh_size
, GFP_KERNEL
);
2001 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2002 Elf_Shdr
*sechdrs
, char *secstrings
)
2007 /* Allocate and load the module: note that size of section 0 is always
2008 zero, and we rely on this for optional sections. */
2009 static noinline
struct module
*load_module(void __user
*umod
,
2011 const char __user
*uargs
)
2015 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
2018 unsigned int symindex
= 0;
2019 unsigned int strindex
= 0;
2020 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
2023 void *ptr
= NULL
; /* Stops spurious gcc warning */
2024 unsigned long symoffs
, stroffs
, *strmap
;
2025 void __percpu
*percpu
;
2027 mm_segment_t old_fs
;
2029 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2031 if (len
< sizeof(*hdr
))
2032 return ERR_PTR(-ENOEXEC
);
2034 /* Suck in entire file: we'll want most of it. */
2035 /* vmalloc barfs on "unusual" numbers. Check here */
2036 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
2037 return ERR_PTR(-ENOMEM
);
2039 if (copy_from_user(hdr
, umod
, len
) != 0) {
2044 /* Sanity checks against insmoding binaries or wrong arch,
2045 weird elf version */
2046 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2047 || hdr
->e_type
!= ET_REL
2048 || !elf_check_arch(hdr
)
2049 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
2054 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
2057 /* Convenience variables */
2058 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
2059 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
2060 sechdrs
[0].sh_addr
= 0;
2062 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2063 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
2064 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
2067 /* Mark all sections sh_addr with their address in the
2069 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
2071 /* Internal symbols and strings. */
2072 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2074 strindex
= sechdrs
[i
].sh_link
;
2075 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
2077 #ifndef CONFIG_MODULE_UNLOAD
2078 /* Don't load .exit sections */
2079 if (strstarts(secstrings
+sechdrs
[i
].sh_name
, ".exit"))
2080 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2084 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
2085 ".gnu.linkonce.this_module");
2087 printk(KERN_WARNING
"No module found in object\n");
2091 /* This is temporary: point mod into copy of data. */
2092 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2094 if (symindex
== 0) {
2095 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2101 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
2102 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
2103 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
2105 /* Don't keep modinfo and version sections. */
2106 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2107 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2109 /* Check module struct version now, before we try to use module. */
2110 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
2115 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2116 /* This is allowed: modprobe --force will invalidate it. */
2118 err
= try_to_force_load(mod
, "bad vermagic");
2121 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2122 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2123 mod
->name
, modmagic
, vermagic
);
2128 staging
= get_modinfo(sechdrs
, infoindex
, "staging");
2130 add_taint_module(mod
, TAINT_CRAP
);
2131 printk(KERN_WARNING
"%s: module is from the staging directory,"
2132 " the quality is unknown, you have been warned.\n",
2136 /* Now copy in args */
2137 args
= strndup_user(uargs
, ~0UL >> 1);
2139 err
= PTR_ERR(args
);
2143 strmap
= kzalloc(BITS_TO_LONGS(sechdrs
[strindex
].sh_size
)
2144 * sizeof(long), GFP_KERNEL
);
2150 if (find_module(mod
->name
)) {
2155 mod
->state
= MODULE_STATE_COMING
;
2157 /* Allow arches to frob section contents and sizes. */
2158 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2163 /* We have a special allocation for this section. */
2164 err
= percpu_modalloc(mod
, sechdrs
[pcpuindex
].sh_size
,
2165 sechdrs
[pcpuindex
].sh_addralign
);
2168 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2170 /* Keep this around for failure path. */
2171 percpu
= mod_percpu(mod
);
2173 /* Determine total sizes, and put offsets in sh_entsize. For now
2174 this is done generically; there doesn't appear to be any
2175 special cases for the architectures. */
2176 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2177 symoffs
= layout_symtab(mod
, sechdrs
, symindex
, strindex
, hdr
,
2178 secstrings
, &stroffs
, strmap
);
2180 /* Do the allocs. */
2181 ptr
= module_alloc_update_bounds(mod
->core_size
);
2183 * The pointer to this block is stored in the module structure
2184 * which is inside the block. Just mark it as not being a
2187 kmemleak_not_leak(ptr
);
2192 memset(ptr
, 0, mod
->core_size
);
2193 mod
->module_core
= ptr
;
2195 ptr
= module_alloc_update_bounds(mod
->init_size
);
2197 * The pointer to this block is stored in the module structure
2198 * which is inside the block. This block doesn't need to be
2199 * scanned as it contains data and code that will be freed
2200 * after the module is initialized.
2202 kmemleak_ignore(ptr
);
2203 if (!ptr
&& mod
->init_size
) {
2207 memset(ptr
, 0, mod
->init_size
);
2208 mod
->module_init
= ptr
;
2210 /* Transfer each section which specifies SHF_ALLOC */
2211 DEBUGP("final section addresses:\n");
2212 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2215 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2218 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2219 dest
= mod
->module_init
2220 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2222 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2224 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2225 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2226 sechdrs
[i
].sh_size
);
2227 /* Update sh_addr to point to copy in image. */
2228 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2229 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2231 /* Module has been moved. */
2232 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2233 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2235 #if defined(CONFIG_MODULE_UNLOAD)
2236 mod
->refptr
= alloc_percpu(struct module_ref
);
2242 /* Now we've moved module, initialize linked lists, etc. */
2243 module_unload_init(mod
);
2245 /* add kobject, so we can reference it. */
2246 err
= mod_sysfs_init(mod
);
2250 /* Set up license info based on the info section */
2251 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2254 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2255 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2256 * using GPL-only symbols it needs.
2258 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2259 add_taint(TAINT_PROPRIETARY_MODULE
);
2261 /* driverloader was caught wrongly pretending to be under GPL */
2262 if (strcmp(mod
->name
, "driverloader") == 0)
2263 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2265 /* Set up MODINFO_ATTR fields */
2266 setup_modinfo(mod
, sechdrs
, infoindex
);
2268 /* Fix up syms, so that st_value is a pointer to location. */
2269 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2274 /* Now we've got everything in the final locations, we can
2275 * find optional sections. */
2276 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2277 sizeof(*mod
->kp
), &mod
->num_kp
);
2278 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2279 sizeof(*mod
->syms
), &mod
->num_syms
);
2280 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2281 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2282 sizeof(*mod
->gpl_syms
),
2283 &mod
->num_gpl_syms
);
2284 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2285 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2286 "__ksymtab_gpl_future",
2287 sizeof(*mod
->gpl_future_syms
),
2288 &mod
->num_gpl_future_syms
);
2289 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2290 "__kcrctab_gpl_future");
2292 #ifdef CONFIG_UNUSED_SYMBOLS
2293 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2295 sizeof(*mod
->unused_syms
),
2296 &mod
->num_unused_syms
);
2297 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2298 "__kcrctab_unused");
2299 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2300 "__ksymtab_unused_gpl",
2301 sizeof(*mod
->unused_gpl_syms
),
2302 &mod
->num_unused_gpl_syms
);
2303 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2304 "__kcrctab_unused_gpl");
2306 #ifdef CONFIG_CONSTRUCTORS
2307 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2308 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2311 #ifdef CONFIG_TRACEPOINTS
2312 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2314 sizeof(*mod
->tracepoints
),
2315 &mod
->num_tracepoints
);
2317 #ifdef CONFIG_EVENT_TRACING
2318 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2320 sizeof(*mod
->trace_events
),
2321 &mod
->num_trace_events
);
2323 * This section contains pointers to allocated objects in the trace
2324 * code and not scanning it leads to false positives.
2326 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2327 mod
->num_trace_events
, GFP_KERNEL
);
2329 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2330 /* sechdrs[0].sh_size is always zero */
2331 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2333 sizeof(*mod
->ftrace_callsites
),
2334 &mod
->num_ftrace_callsites
);
2336 #ifdef CONFIG_MODVERSIONS
2337 if ((mod
->num_syms
&& !mod
->crcs
)
2338 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2339 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2340 #ifdef CONFIG_UNUSED_SYMBOLS
2341 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2342 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2345 err
= try_to_force_load(mod
,
2346 "no versions for exported symbols");
2352 /* Now do relocations. */
2353 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2354 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2355 unsigned int info
= sechdrs
[i
].sh_info
;
2357 /* Not a valid relocation section? */
2358 if (info
>= hdr
->e_shnum
)
2361 /* Don't bother with non-allocated sections */
2362 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2365 if (sechdrs
[i
].sh_type
== SHT_REL
)
2366 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2367 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2368 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2374 /* Find duplicate symbols */
2375 err
= verify_export_symbols(mod
);
2379 /* Set up and sort exception table */
2380 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2381 sizeof(*mod
->extable
), &mod
->num_exentries
);
2382 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2384 /* Finally, copy percpu area over. */
2385 percpu_modcopy(mod
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2386 sechdrs
[pcpuindex
].sh_size
);
2388 add_kallsyms(mod
, sechdrs
, hdr
->e_shnum
, symindex
, strindex
,
2389 symoffs
, stroffs
, secstrings
, strmap
);
2394 struct _ddebug
*debug
;
2395 unsigned int num_debug
;
2397 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2398 sizeof(*debug
), &num_debug
);
2400 dynamic_debug_setup(debug
, num_debug
);
2403 err
= module_finalize(hdr
, sechdrs
, mod
);
2407 /* flush the icache in correct context */
2412 * Flush the instruction cache, since we've played with text.
2413 * Do it before processing of module parameters, so the module
2414 * can provide parameter accessor functions of its own.
2416 if (mod
->module_init
)
2417 flush_icache_range((unsigned long)mod
->module_init
,
2418 (unsigned long)mod
->module_init
2420 flush_icache_range((unsigned long)mod
->module_core
,
2421 (unsigned long)mod
->module_core
+ mod
->core_size
);
2426 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2427 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2430 /* Now sew it into the lists so we can get lockdep and oops
2431 * info during argument parsing. Noone should access us, since
2432 * strong_try_module_get() will fail.
2433 * lockdep/oops can run asynchronous, so use the RCU list insertion
2434 * function to insert in a way safe to concurrent readers.
2435 * The mutex protects against concurrent writers.
2437 list_add_rcu(&mod
->list
, &modules
);
2439 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2443 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2446 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2447 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2449 /* Get rid of temporary copy */
2452 trace_module_load(mod
);
2458 /* Unlink carefully: kallsyms could be walking list. */
2459 list_del_rcu(&mod
->list
);
2460 synchronize_sched();
2461 module_arch_cleanup(mod
);
2464 kobject_del(&mod
->mkobj
.kobj
);
2465 kobject_put(&mod
->mkobj
.kobj
);
2467 module_unload_free(mod
);
2468 #if defined(CONFIG_MODULE_UNLOAD)
2469 free_percpu(mod
->refptr
);
2472 module_free(mod
, mod
->module_init
);
2474 module_free(mod
, mod
->module_core
);
2475 /* mod will be freed with core. Don't access it beyond this line! */
2477 free_percpu(percpu
);
2483 return ERR_PTR(err
);
2486 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2491 /* Call module constructors. */
2492 static void do_mod_ctors(struct module
*mod
)
2494 #ifdef CONFIG_CONSTRUCTORS
2497 for (i
= 0; i
< mod
->num_ctors
; i
++)
2502 /* This is where the real work happens */
2503 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2504 unsigned long, len
, const char __user
*, uargs
)
2509 /* Must have permission */
2510 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2513 /* Only one module load at a time, please */
2514 if (mutex_lock_interruptible(&module_mutex
) != 0)
2517 /* Do all the hard work */
2518 mod
= load_module(umod
, len
, uargs
);
2520 mutex_unlock(&module_mutex
);
2521 return PTR_ERR(mod
);
2524 /* Drop lock so they can recurse */
2525 mutex_unlock(&module_mutex
);
2527 blocking_notifier_call_chain(&module_notify_list
,
2528 MODULE_STATE_COMING
, mod
);
2531 /* Start the module */
2532 if (mod
->init
!= NULL
)
2533 ret
= do_one_initcall(mod
->init
);
2535 /* Init routine failed: abort. Try to protect us from
2536 buggy refcounters. */
2537 mod
->state
= MODULE_STATE_GOING
;
2538 synchronize_sched();
2540 blocking_notifier_call_chain(&module_notify_list
,
2541 MODULE_STATE_GOING
, mod
);
2542 mutex_lock(&module_mutex
);
2544 mutex_unlock(&module_mutex
);
2545 wake_up(&module_wq
);
2550 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2551 "%s: loading module anyway...\n",
2552 __func__
, mod
->name
, ret
,
2557 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2558 mod
->state
= MODULE_STATE_LIVE
;
2559 wake_up(&module_wq
);
2560 blocking_notifier_call_chain(&module_notify_list
,
2561 MODULE_STATE_LIVE
, mod
);
2563 /* We need to finish all async code before the module init sequence is done */
2564 async_synchronize_full();
2566 mutex_lock(&module_mutex
);
2567 /* Drop initial reference. */
2569 trim_init_extable(mod
);
2570 #ifdef CONFIG_KALLSYMS
2571 mod
->num_symtab
= mod
->core_num_syms
;
2572 mod
->symtab
= mod
->core_symtab
;
2573 mod
->strtab
= mod
->core_strtab
;
2575 module_free(mod
, mod
->module_init
);
2576 mod
->module_init
= NULL
;
2578 mod
->init_text_size
= 0;
2579 mutex_unlock(&module_mutex
);
2584 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2586 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2589 #ifdef CONFIG_KALLSYMS
2591 * This ignores the intensely annoying "mapping symbols" found
2592 * in ARM ELF files: $a, $t and $d.
2594 static inline int is_arm_mapping_symbol(const char *str
)
2596 return str
[0] == '$' && strchr("atd", str
[1])
2597 && (str
[2] == '\0' || str
[2] == '.');
2600 static const char *get_ksymbol(struct module
*mod
,
2602 unsigned long *size
,
2603 unsigned long *offset
)
2605 unsigned int i
, best
= 0;
2606 unsigned long nextval
;
2608 /* At worse, next value is at end of module */
2609 if (within_module_init(addr
, mod
))
2610 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2612 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2614 /* Scan for closest preceeding symbol, and next symbol. (ELF
2615 starts real symbols at 1). */
2616 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2617 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2620 /* We ignore unnamed symbols: they're uninformative
2621 * and inserted at a whim. */
2622 if (mod
->symtab
[i
].st_value
<= addr
2623 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2624 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2625 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2627 if (mod
->symtab
[i
].st_value
> addr
2628 && mod
->symtab
[i
].st_value
< nextval
2629 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2630 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2631 nextval
= mod
->symtab
[i
].st_value
;
2638 *size
= nextval
- mod
->symtab
[best
].st_value
;
2640 *offset
= addr
- mod
->symtab
[best
].st_value
;
2641 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2644 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2645 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2646 const char *module_address_lookup(unsigned long addr
,
2647 unsigned long *size
,
2648 unsigned long *offset
,
2653 const char *ret
= NULL
;
2656 list_for_each_entry_rcu(mod
, &modules
, list
) {
2657 if (within_module_init(addr
, mod
) ||
2658 within_module_core(addr
, mod
)) {
2660 *modname
= mod
->name
;
2661 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2665 /* Make a copy in here where it's safe */
2667 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2674 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2679 list_for_each_entry_rcu(mod
, &modules
, list
) {
2680 if (within_module_init(addr
, mod
) ||
2681 within_module_core(addr
, mod
)) {
2684 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2687 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2697 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2698 unsigned long *offset
, char *modname
, char *name
)
2703 list_for_each_entry_rcu(mod
, &modules
, list
) {
2704 if (within_module_init(addr
, mod
) ||
2705 within_module_core(addr
, mod
)) {
2708 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2712 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2714 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2724 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2725 char *name
, char *module_name
, int *exported
)
2730 list_for_each_entry_rcu(mod
, &modules
, list
) {
2731 if (symnum
< mod
->num_symtab
) {
2732 *value
= mod
->symtab
[symnum
].st_value
;
2733 *type
= mod
->symtab
[symnum
].st_info
;
2734 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2736 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2737 *exported
= is_exported(name
, *value
, mod
);
2741 symnum
-= mod
->num_symtab
;
2747 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2751 for (i
= 0; i
< mod
->num_symtab
; i
++)
2752 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2753 mod
->symtab
[i
].st_info
!= 'U')
2754 return mod
->symtab
[i
].st_value
;
2758 /* Look for this name: can be of form module:name. */
2759 unsigned long module_kallsyms_lookup_name(const char *name
)
2763 unsigned long ret
= 0;
2765 /* Don't lock: we're in enough trouble already. */
2767 if ((colon
= strchr(name
, ':')) != NULL
) {
2769 if ((mod
= find_module(name
)) != NULL
)
2770 ret
= mod_find_symname(mod
, colon
+1);
2773 list_for_each_entry_rcu(mod
, &modules
, list
)
2774 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2781 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2782 struct module
*, unsigned long),
2789 list_for_each_entry(mod
, &modules
, list
) {
2790 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2791 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2792 mod
, mod
->symtab
[i
].st_value
);
2799 #endif /* CONFIG_KALLSYMS */
2801 static char *module_flags(struct module
*mod
, char *buf
)
2806 mod
->state
== MODULE_STATE_GOING
||
2807 mod
->state
== MODULE_STATE_COMING
) {
2809 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2811 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2813 if (mod
->taints
& (1 << TAINT_CRAP
))
2816 * TAINT_FORCED_RMMOD: could be added.
2817 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2821 /* Show a - for module-is-being-unloaded */
2822 if (mod
->state
== MODULE_STATE_GOING
)
2824 /* Show a + for module-is-being-loaded */
2825 if (mod
->state
== MODULE_STATE_COMING
)
2834 #ifdef CONFIG_PROC_FS
2835 /* Called by the /proc file system to return a list of modules. */
2836 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2838 mutex_lock(&module_mutex
);
2839 return seq_list_start(&modules
, *pos
);
2842 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2844 return seq_list_next(p
, &modules
, pos
);
2847 static void m_stop(struct seq_file
*m
, void *p
)
2849 mutex_unlock(&module_mutex
);
2852 static int m_show(struct seq_file
*m
, void *p
)
2854 struct module
*mod
= list_entry(p
, struct module
, list
);
2857 seq_printf(m
, "%s %u",
2858 mod
->name
, mod
->init_size
+ mod
->core_size
);
2859 print_unload_info(m
, mod
);
2861 /* Informative for users. */
2862 seq_printf(m
, " %s",
2863 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2864 mod
->state
== MODULE_STATE_COMING
? "Loading":
2866 /* Used by oprofile and other similar tools. */
2867 seq_printf(m
, " 0x%p", mod
->module_core
);
2871 seq_printf(m
, " %s", module_flags(mod
, buf
));
2873 seq_printf(m
, "\n");
2877 /* Format: modulename size refcount deps address
2879 Where refcount is a number or -, and deps is a comma-separated list
2882 static const struct seq_operations modules_op
= {
2889 static int modules_open(struct inode
*inode
, struct file
*file
)
2891 return seq_open(file
, &modules_op
);
2894 static const struct file_operations proc_modules_operations
= {
2895 .open
= modules_open
,
2897 .llseek
= seq_lseek
,
2898 .release
= seq_release
,
2901 static int __init
proc_modules_init(void)
2903 proc_create("modules", 0, NULL
, &proc_modules_operations
);
2906 module_init(proc_modules_init
);
2909 /* Given an address, look for it in the module exception tables. */
2910 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2912 const struct exception_table_entry
*e
= NULL
;
2916 list_for_each_entry_rcu(mod
, &modules
, list
) {
2917 if (mod
->num_exentries
== 0)
2920 e
= search_extable(mod
->extable
,
2921 mod
->extable
+ mod
->num_exentries
- 1,
2928 /* Now, if we found one, we are running inside it now, hence
2929 we cannot unload the module, hence no refcnt needed. */
2934 * is_module_address - is this address inside a module?
2935 * @addr: the address to check.
2937 * See is_module_text_address() if you simply want to see if the address
2938 * is code (not data).
2940 bool is_module_address(unsigned long addr
)
2945 ret
= __module_address(addr
) != NULL
;
2952 * __module_address - get the module which contains an address.
2953 * @addr: the address.
2955 * Must be called with preempt disabled or module mutex held so that
2956 * module doesn't get freed during this.
2958 struct module
*__module_address(unsigned long addr
)
2962 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2965 list_for_each_entry_rcu(mod
, &modules
, list
)
2966 if (within_module_core(addr
, mod
)
2967 || within_module_init(addr
, mod
))
2971 EXPORT_SYMBOL_GPL(__module_address
);
2974 * is_module_text_address - is this address inside module code?
2975 * @addr: the address to check.
2977 * See is_module_address() if you simply want to see if the address is
2978 * anywhere in a module. See kernel_text_address() for testing if an
2979 * address corresponds to kernel or module code.
2981 bool is_module_text_address(unsigned long addr
)
2986 ret
= __module_text_address(addr
) != NULL
;
2993 * __module_text_address - get the module whose code contains an address.
2994 * @addr: the address.
2996 * Must be called with preempt disabled or module mutex held so that
2997 * module doesn't get freed during this.
2999 struct module
*__module_text_address(unsigned long addr
)
3001 struct module
*mod
= __module_address(addr
);
3003 /* Make sure it's within the text section. */
3004 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3005 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3010 EXPORT_SYMBOL_GPL(__module_text_address
);
3012 /* Don't grab lock, we're oopsing. */
3013 void print_modules(void)
3018 printk(KERN_DEFAULT
"Modules linked in:");
3019 /* Most callers should already have preempt disabled, but make sure */
3021 list_for_each_entry_rcu(mod
, &modules
, list
)
3022 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3024 if (last_unloaded_module
[0])
3025 printk(" [last unloaded: %s]", last_unloaded_module
);
3029 #ifdef CONFIG_MODVERSIONS
3030 /* Generate the signature for all relevant module structures here.
3031 * If these change, we don't want to try to parse the module. */
3032 void module_layout(struct module
*mod
,
3033 struct modversion_info
*ver
,
3034 struct kernel_param
*kp
,
3035 struct kernel_symbol
*ks
,
3036 struct tracepoint
*tp
)
3039 EXPORT_SYMBOL(module_layout
);
3042 #ifdef CONFIG_TRACEPOINTS
3043 void module_update_tracepoints(void)
3047 mutex_lock(&module_mutex
);
3048 list_for_each_entry(mod
, &modules
, list
)
3050 tracepoint_update_probe_range(mod
->tracepoints
,
3051 mod
->tracepoints
+ mod
->num_tracepoints
);
3052 mutex_unlock(&module_mutex
);
3056 * Returns 0 if current not found.
3057 * Returns 1 if current found.
3059 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
3061 struct module
*iter_mod
;
3064 mutex_lock(&module_mutex
);
3065 list_for_each_entry(iter_mod
, &modules
, list
) {
3066 if (!iter_mod
->taints
) {
3068 * Sorted module list
3070 if (iter_mod
< iter
->module
)
3072 else if (iter_mod
> iter
->module
)
3073 iter
->tracepoint
= NULL
;
3074 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
3075 iter_mod
->tracepoints
,
3076 iter_mod
->tracepoints
3077 + iter_mod
->num_tracepoints
);
3079 iter
->module
= iter_mod
;
3084 mutex_unlock(&module_mutex
);