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>
62 EXPORT_TRACEPOINT_SYMBOL(module_get
);
67 #define DEBUGP(fmt , a...)
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
74 /* If this is set, the section belongs in the init part of the module */
75 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
77 /* List of modules, protected by module_mutex or preempt_disable
78 * (delete uses stop_machine/add uses RCU list operations). */
79 DEFINE_MUTEX(module_mutex
);
80 EXPORT_SYMBOL_GPL(module_mutex
);
81 static LIST_HEAD(modules
);
83 /* Block module loading/unloading? */
84 int modules_disabled
= 0;
86 /* Waiting for a module to finish initializing? */
87 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
89 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
91 /* Bounds of module allocation, for speeding __module_address */
92 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
94 int register_module_notifier(struct notifier_block
* nb
)
96 return blocking_notifier_chain_register(&module_notify_list
, nb
);
98 EXPORT_SYMBOL(register_module_notifier
);
100 int unregister_module_notifier(struct notifier_block
* nb
)
102 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
104 EXPORT_SYMBOL(unregister_module_notifier
);
106 /* We require a truly strong try_module_get(): 0 means failure due to
107 ongoing or failed initialization etc. */
108 static inline int strong_try_module_get(struct module
*mod
)
110 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
112 if (try_module_get(mod
))
118 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
121 mod
->taints
|= (1U << flag
);
125 * A thread that wants to hold a reference to a module only while it
126 * is running can call this to safely exit. nfsd and lockd use this.
128 void __module_put_and_exit(struct module
*mod
, long code
)
133 EXPORT_SYMBOL(__module_put_and_exit
);
135 /* Find a module section: 0 means not found. */
136 static unsigned int find_sec(Elf_Ehdr
*hdr
,
138 const char *secstrings
,
143 for (i
= 1; i
< hdr
->e_shnum
; i
++)
144 /* Alloc bit cleared means "ignore it." */
145 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
146 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
151 /* Find a module section, or NULL. */
152 static void *section_addr(Elf_Ehdr
*hdr
, Elf_Shdr
*shdrs
,
153 const char *secstrings
, const char *name
)
155 /* Section 0 has sh_addr 0. */
156 return (void *)shdrs
[find_sec(hdr
, shdrs
, secstrings
, name
)].sh_addr
;
159 /* Find a module section, or NULL. Fill in number of "objects" in section. */
160 static void *section_objs(Elf_Ehdr
*hdr
,
162 const char *secstrings
,
167 unsigned int sec
= find_sec(hdr
, sechdrs
, secstrings
, name
);
169 /* Section 0 has sh_addr 0 and sh_size 0. */
170 *num
= sechdrs
[sec
].sh_size
/ object_size
;
171 return (void *)sechdrs
[sec
].sh_addr
;
174 /* Provided by the linker */
175 extern const struct kernel_symbol __start___ksymtab
[];
176 extern const struct kernel_symbol __stop___ksymtab
[];
177 extern const struct kernel_symbol __start___ksymtab_gpl
[];
178 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
179 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
180 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
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
518 /* Init the unload section of the module. */
519 static void module_unload_init(struct module
*mod
)
523 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
524 for_each_possible_cpu(cpu
)
525 per_cpu_ptr(mod
->refptr
, cpu
)->count
= 0;
527 /* Hold reference count during initialization. */
528 __this_cpu_write(mod
->refptr
->count
, 1);
529 /* Backwards compatibility macros put refcount during init. */
530 mod
->waiter
= current
;
533 /* modules using other modules */
536 struct list_head list
;
537 struct module
*module_which_uses
;
540 /* Does a already use b? */
541 static int already_uses(struct module
*a
, struct module
*b
)
543 struct module_use
*use
;
545 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
546 if (use
->module_which_uses
== a
) {
547 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
551 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
555 /* Module a uses b */
556 int use_module(struct module
*a
, struct module
*b
)
558 struct module_use
*use
;
561 if (b
== NULL
|| already_uses(a
, b
)) return 1;
563 /* If we're interrupted or time out, we fail. */
564 if (wait_event_interruptible_timeout(
565 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
567 printk("%s: gave up waiting for init of module %s.\n",
572 /* If strong_try_module_get() returned a different error, we fail. */
576 DEBUGP("Allocating new usage for %s.\n", a
->name
);
577 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
579 printk("%s: out of memory loading\n", a
->name
);
584 use
->module_which_uses
= a
;
585 list_add(&use
->list
, &b
->modules_which_use_me
);
586 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
589 EXPORT_SYMBOL_GPL(use_module
);
591 /* Clear the unload stuff of the module. */
592 static void module_unload_free(struct module
*mod
)
596 list_for_each_entry(i
, &modules
, list
) {
597 struct module_use
*use
;
599 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
600 if (use
->module_which_uses
== mod
) {
601 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
603 list_del(&use
->list
);
605 sysfs_remove_link(i
->holders_dir
, mod
->name
);
606 /* There can be at most one match. */
613 #ifdef CONFIG_MODULE_FORCE_UNLOAD
614 static inline int try_force_unload(unsigned int flags
)
616 int ret
= (flags
& O_TRUNC
);
618 add_taint(TAINT_FORCED_RMMOD
);
622 static inline int try_force_unload(unsigned int flags
)
626 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
635 /* Whole machine is stopped with interrupts off when this runs. */
636 static int __try_stop_module(void *_sref
)
638 struct stopref
*sref
= _sref
;
640 /* If it's not unused, quit unless we're forcing. */
641 if (module_refcount(sref
->mod
) != 0) {
642 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
646 /* Mark it as dying. */
647 sref
->mod
->state
= MODULE_STATE_GOING
;
651 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
653 if (flags
& O_NONBLOCK
) {
654 struct stopref sref
= { mod
, flags
, forced
};
656 return stop_machine(__try_stop_module
, &sref
, NULL
);
658 /* We don't need to stop the machine for this. */
659 mod
->state
= MODULE_STATE_GOING
;
665 unsigned int module_refcount(struct module
*mod
)
667 unsigned int total
= 0;
670 for_each_possible_cpu(cpu
)
671 total
+= per_cpu_ptr(mod
->refptr
, cpu
)->count
;
674 EXPORT_SYMBOL(module_refcount
);
676 /* This exists whether we can unload or not */
677 static void free_module(struct module
*mod
);
679 static void wait_for_zero_refcount(struct module
*mod
)
681 /* Since we might sleep for some time, release the mutex first */
682 mutex_unlock(&module_mutex
);
684 DEBUGP("Looking at refcount...\n");
685 set_current_state(TASK_UNINTERRUPTIBLE
);
686 if (module_refcount(mod
) == 0)
690 current
->state
= TASK_RUNNING
;
691 mutex_lock(&module_mutex
);
694 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
698 char name
[MODULE_NAME_LEN
];
701 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
704 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
706 name
[MODULE_NAME_LEN
-1] = '\0';
708 /* Create stop_machine threads since free_module relies on
709 * a non-failing stop_machine call. */
710 ret
= stop_machine_create();
714 if (mutex_lock_interruptible(&module_mutex
) != 0) {
719 mod
= find_module(name
);
725 if (!list_empty(&mod
->modules_which_use_me
)) {
726 /* Other modules depend on us: get rid of them first. */
731 /* Doing init or already dying? */
732 if (mod
->state
!= MODULE_STATE_LIVE
) {
733 /* FIXME: if (force), slam module count and wake up
735 DEBUGP("%s already dying\n", mod
->name
);
740 /* If it has an init func, it must have an exit func to unload */
741 if (mod
->init
&& !mod
->exit
) {
742 forced
= try_force_unload(flags
);
744 /* This module can't be removed */
750 /* Set this up before setting mod->state */
751 mod
->waiter
= current
;
753 /* Stop the machine so refcounts can't move and disable module. */
754 ret
= try_stop_module(mod
, flags
, &forced
);
758 /* Never wait if forced. */
759 if (!forced
&& module_refcount(mod
) != 0)
760 wait_for_zero_refcount(mod
);
762 mutex_unlock(&module_mutex
);
763 /* Final destruction now noone is using it. */
764 if (mod
->exit
!= NULL
)
766 blocking_notifier_call_chain(&module_notify_list
,
767 MODULE_STATE_GOING
, mod
);
768 async_synchronize_full();
769 mutex_lock(&module_mutex
);
770 /* Store the name of the last unloaded module for diagnostic purposes */
771 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
772 ddebug_remove_module(mod
->name
);
776 mutex_unlock(&module_mutex
);
778 stop_machine_destroy();
782 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
784 struct module_use
*use
;
785 int printed_something
= 0;
787 seq_printf(m
, " %u ", module_refcount(mod
));
789 /* Always include a trailing , so userspace can differentiate
790 between this and the old multi-field proc format. */
791 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
792 printed_something
= 1;
793 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
796 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
797 printed_something
= 1;
798 seq_printf(m
, "[permanent],");
801 if (!printed_something
)
805 void __symbol_put(const char *symbol
)
807 struct module
*owner
;
810 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
815 EXPORT_SYMBOL(__symbol_put
);
817 /* Note this assumes addr is a function, which it currently always is. */
818 void symbol_put_addr(void *addr
)
820 struct module
*modaddr
;
821 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
823 if (core_kernel_text(a
))
826 /* module_text_address is safe here: we're supposed to have reference
827 * to module from symbol_get, so it can't go away. */
828 modaddr
= __module_text_address(a
);
832 EXPORT_SYMBOL_GPL(symbol_put_addr
);
834 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
835 struct module
*mod
, char *buffer
)
837 return sprintf(buffer
, "%u\n", module_refcount(mod
));
840 static struct module_attribute refcnt
= {
841 .attr
= { .name
= "refcnt", .mode
= 0444 },
845 void module_put(struct module
*module
)
849 __this_cpu_dec(module
->refptr
->count
);
851 trace_module_put(module
, _RET_IP_
,
852 __this_cpu_read(module
->refptr
->count
));
853 /* Maybe they're waiting for us to drop reference? */
854 if (unlikely(!module_is_live(module
)))
855 wake_up_process(module
->waiter
);
859 EXPORT_SYMBOL(module_put
);
861 #else /* !CONFIG_MODULE_UNLOAD */
862 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
864 /* We don't know the usage count, or what modules are using. */
865 seq_printf(m
, " - -");
868 static inline void module_unload_free(struct module
*mod
)
872 int use_module(struct module
*a
, struct module
*b
)
874 return strong_try_module_get(b
) == 0;
876 EXPORT_SYMBOL_GPL(use_module
);
878 static inline void module_unload_init(struct module
*mod
)
881 #endif /* CONFIG_MODULE_UNLOAD */
883 static ssize_t
show_initstate(struct module_attribute
*mattr
,
884 struct module
*mod
, char *buffer
)
886 const char *state
= "unknown";
888 switch (mod
->state
) {
889 case MODULE_STATE_LIVE
:
892 case MODULE_STATE_COMING
:
895 case MODULE_STATE_GOING
:
899 return sprintf(buffer
, "%s\n", state
);
902 static struct module_attribute initstate
= {
903 .attr
= { .name
= "initstate", .mode
= 0444 },
904 .show
= show_initstate
,
907 static struct module_attribute
*modinfo_attrs
[] = {
911 #ifdef CONFIG_MODULE_UNLOAD
917 static const char vermagic
[] = VERMAGIC_STRING
;
919 static int try_to_force_load(struct module
*mod
, const char *reason
)
921 #ifdef CONFIG_MODULE_FORCE_LOAD
922 if (!test_taint(TAINT_FORCED_MODULE
))
923 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
925 add_taint_module(mod
, TAINT_FORCED_MODULE
);
932 #ifdef CONFIG_MODVERSIONS
933 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
934 static unsigned long maybe_relocated(unsigned long crc
,
935 const struct module
*crc_owner
)
937 #ifdef ARCH_RELOCATES_KCRCTAB
938 if (crc_owner
== NULL
)
939 return crc
- (unsigned long)reloc_start
;
944 static int check_version(Elf_Shdr
*sechdrs
,
945 unsigned int versindex
,
948 const unsigned long *crc
,
949 const struct module
*crc_owner
)
951 unsigned int i
, num_versions
;
952 struct modversion_info
*versions
;
954 /* Exporting module didn't supply crcs? OK, we're already tainted. */
958 /* No versions at all? modprobe --force does this. */
960 return try_to_force_load(mod
, symname
) == 0;
962 versions
= (void *) sechdrs
[versindex
].sh_addr
;
963 num_versions
= sechdrs
[versindex
].sh_size
964 / sizeof(struct modversion_info
);
966 for (i
= 0; i
< num_versions
; i
++) {
967 if (strcmp(versions
[i
].name
, symname
) != 0)
970 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
972 DEBUGP("Found checksum %lX vs module %lX\n",
973 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
977 printk(KERN_WARNING
"%s: no symbol version for %s\n",
982 printk("%s: disagrees about version of symbol %s\n",
987 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
988 unsigned int versindex
,
991 const unsigned long *crc
;
993 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
996 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1000 /* First part is kernel version, which we ignore if module has crcs. */
1001 static inline int same_magic(const char *amagic
, const char *bmagic
,
1005 amagic
+= strcspn(amagic
, " ");
1006 bmagic
+= strcspn(bmagic
, " ");
1008 return strcmp(amagic
, bmagic
) == 0;
1011 static inline int check_version(Elf_Shdr
*sechdrs
,
1012 unsigned int versindex
,
1013 const char *symname
,
1015 const unsigned long *crc
,
1016 const struct module
*crc_owner
)
1021 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1022 unsigned int versindex
,
1028 static inline int same_magic(const char *amagic
, const char *bmagic
,
1031 return strcmp(amagic
, bmagic
) == 0;
1033 #endif /* CONFIG_MODVERSIONS */
1035 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1036 Must be holding module_mutex. */
1037 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1038 unsigned int versindex
,
1042 struct module
*owner
;
1043 const struct kernel_symbol
*sym
;
1044 const unsigned long *crc
;
1046 sym
= find_symbol(name
, &owner
, &crc
,
1047 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1048 /* use_module can fail due to OOM,
1049 or module initialization or unloading */
1051 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
, owner
)
1052 || !use_module(mod
, owner
))
1059 * /sys/module/foo/sections stuff
1060 * J. Corbet <corbet@lwn.net>
1062 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1064 static inline bool sect_empty(const Elf_Shdr
*sect
)
1066 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1069 struct module_sect_attr
1071 struct module_attribute mattr
;
1073 unsigned long address
;
1076 struct module_sect_attrs
1078 struct attribute_group grp
;
1079 unsigned int nsections
;
1080 struct module_sect_attr attrs
[0];
1083 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1084 struct module
*mod
, char *buf
)
1086 struct module_sect_attr
*sattr
=
1087 container_of(mattr
, struct module_sect_attr
, mattr
);
1088 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1091 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1093 unsigned int section
;
1095 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1096 kfree(sect_attrs
->attrs
[section
].name
);
1100 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1101 char *secstrings
, Elf_Shdr
*sechdrs
)
1103 unsigned int nloaded
= 0, i
, size
[2];
1104 struct module_sect_attrs
*sect_attrs
;
1105 struct module_sect_attr
*sattr
;
1106 struct attribute
**gattr
;
1108 /* Count loaded sections and allocate structures */
1109 for (i
= 0; i
< nsect
; i
++)
1110 if (!sect_empty(&sechdrs
[i
]))
1112 size
[0] = ALIGN(sizeof(*sect_attrs
)
1113 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1114 sizeof(sect_attrs
->grp
.attrs
[0]));
1115 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1116 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1117 if (sect_attrs
== NULL
)
1120 /* Setup section attributes. */
1121 sect_attrs
->grp
.name
= "sections";
1122 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1124 sect_attrs
->nsections
= 0;
1125 sattr
= §_attrs
->attrs
[0];
1126 gattr
= §_attrs
->grp
.attrs
[0];
1127 for (i
= 0; i
< nsect
; i
++) {
1128 if (sect_empty(&sechdrs
[i
]))
1130 sattr
->address
= sechdrs
[i
].sh_addr
;
1131 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1133 if (sattr
->name
== NULL
)
1135 sect_attrs
->nsections
++;
1136 sysfs_attr_init(&sattr
->mattr
.attr
);
1137 sattr
->mattr
.show
= module_sect_show
;
1138 sattr
->mattr
.store
= NULL
;
1139 sattr
->mattr
.attr
.name
= sattr
->name
;
1140 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1141 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1145 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1148 mod
->sect_attrs
= sect_attrs
;
1151 free_sect_attrs(sect_attrs
);
1154 static void remove_sect_attrs(struct module
*mod
)
1156 if (mod
->sect_attrs
) {
1157 sysfs_remove_group(&mod
->mkobj
.kobj
,
1158 &mod
->sect_attrs
->grp
);
1159 /* We are positive that no one is using any sect attrs
1160 * at this point. Deallocate immediately. */
1161 free_sect_attrs(mod
->sect_attrs
);
1162 mod
->sect_attrs
= NULL
;
1167 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1170 struct module_notes_attrs
{
1171 struct kobject
*dir
;
1173 struct bin_attribute attrs
[0];
1176 static ssize_t
module_notes_read(struct kobject
*kobj
,
1177 struct bin_attribute
*bin_attr
,
1178 char *buf
, loff_t pos
, size_t count
)
1181 * The caller checked the pos and count against our size.
1183 memcpy(buf
, bin_attr
->private + pos
, count
);
1187 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1190 if (notes_attrs
->dir
) {
1192 sysfs_remove_bin_file(notes_attrs
->dir
,
1193 ¬es_attrs
->attrs
[i
]);
1194 kobject_put(notes_attrs
->dir
);
1199 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1200 char *secstrings
, Elf_Shdr
*sechdrs
)
1202 unsigned int notes
, loaded
, i
;
1203 struct module_notes_attrs
*notes_attrs
;
1204 struct bin_attribute
*nattr
;
1206 /* failed to create section attributes, so can't create notes */
1207 if (!mod
->sect_attrs
)
1210 /* Count notes sections and allocate structures. */
1212 for (i
= 0; i
< nsect
; i
++)
1213 if (!sect_empty(&sechdrs
[i
]) &&
1214 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1220 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1221 + notes
* sizeof(notes_attrs
->attrs
[0]),
1223 if (notes_attrs
== NULL
)
1226 notes_attrs
->notes
= notes
;
1227 nattr
= ¬es_attrs
->attrs
[0];
1228 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1229 if (sect_empty(&sechdrs
[i
]))
1231 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1232 sysfs_bin_attr_init(nattr
);
1233 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1234 nattr
->attr
.mode
= S_IRUGO
;
1235 nattr
->size
= sechdrs
[i
].sh_size
;
1236 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1237 nattr
->read
= module_notes_read
;
1243 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1244 if (!notes_attrs
->dir
)
1247 for (i
= 0; i
< notes
; ++i
)
1248 if (sysfs_create_bin_file(notes_attrs
->dir
,
1249 ¬es_attrs
->attrs
[i
]))
1252 mod
->notes_attrs
= notes_attrs
;
1256 free_notes_attrs(notes_attrs
, i
);
1259 static void remove_notes_attrs(struct module
*mod
)
1261 if (mod
->notes_attrs
)
1262 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1267 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1268 char *sectstrings
, Elf_Shdr
*sechdrs
)
1272 static inline void remove_sect_attrs(struct module
*mod
)
1276 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1277 char *sectstrings
, Elf_Shdr
*sechdrs
)
1281 static inline void remove_notes_attrs(struct module
*mod
)
1287 int module_add_modinfo_attrs(struct module
*mod
)
1289 struct module_attribute
*attr
;
1290 struct module_attribute
*temp_attr
;
1294 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1295 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1297 if (!mod
->modinfo_attrs
)
1300 temp_attr
= mod
->modinfo_attrs
;
1301 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1303 (attr
->test
&& attr
->test(mod
))) {
1304 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1305 sysfs_attr_init(&temp_attr
->attr
);
1306 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1313 void module_remove_modinfo_attrs(struct module
*mod
)
1315 struct module_attribute
*attr
;
1318 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1319 /* pick a field to test for end of list */
1320 if (!attr
->attr
.name
)
1322 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1326 kfree(mod
->modinfo_attrs
);
1329 int mod_sysfs_init(struct module
*mod
)
1332 struct kobject
*kobj
;
1334 if (!module_sysfs_initialized
) {
1335 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1341 kobj
= kset_find_obj(module_kset
, mod
->name
);
1343 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1349 mod
->mkobj
.mod
= mod
;
1351 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1352 mod
->mkobj
.kobj
.kset
= module_kset
;
1353 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1356 kobject_put(&mod
->mkobj
.kobj
);
1358 /* delay uevent until full sysfs population */
1363 int mod_sysfs_setup(struct module
*mod
,
1364 struct kernel_param
*kparam
,
1365 unsigned int num_params
)
1369 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1370 if (!mod
->holders_dir
) {
1375 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1377 goto out_unreg_holders
;
1379 err
= module_add_modinfo_attrs(mod
);
1381 goto out_unreg_param
;
1383 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1387 module_param_sysfs_remove(mod
);
1389 kobject_put(mod
->holders_dir
);
1391 kobject_put(&mod
->mkobj
.kobj
);
1395 static void mod_sysfs_fini(struct module
*mod
)
1397 kobject_put(&mod
->mkobj
.kobj
);
1400 #else /* CONFIG_SYSFS */
1402 static void mod_sysfs_fini(struct module
*mod
)
1406 #endif /* CONFIG_SYSFS */
1408 static void mod_kobject_remove(struct module
*mod
)
1410 module_remove_modinfo_attrs(mod
);
1411 module_param_sysfs_remove(mod
);
1412 kobject_put(mod
->mkobj
.drivers_dir
);
1413 kobject_put(mod
->holders_dir
);
1414 mod_sysfs_fini(mod
);
1418 * unlink the module with the whole machine is stopped with interrupts off
1419 * - this defends against kallsyms not taking locks
1421 static int __unlink_module(void *_mod
)
1423 struct module
*mod
= _mod
;
1424 list_del(&mod
->list
);
1428 /* Free a module, remove from lists, etc (must hold module_mutex). */
1429 static void free_module(struct module
*mod
)
1431 trace_module_free(mod
);
1433 /* Delete from various lists */
1434 stop_machine(__unlink_module
, mod
, NULL
);
1435 remove_notes_attrs(mod
);
1436 remove_sect_attrs(mod
);
1437 mod_kobject_remove(mod
);
1439 /* Arch-specific cleanup. */
1440 module_arch_cleanup(mod
);
1442 /* Module unload stuff */
1443 module_unload_free(mod
);
1445 /* Free any allocated parameters. */
1446 destroy_params(mod
->kp
, mod
->num_kp
);
1448 /* This may be NULL, but that's OK */
1449 module_free(mod
, mod
->module_init
);
1451 percpu_modfree(mod
);
1452 #if defined(CONFIG_MODULE_UNLOAD)
1454 free_percpu(mod
->refptr
);
1456 /* Free lock-classes: */
1457 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1459 /* Finally, free the core (containing the module structure) */
1460 module_free(mod
, mod
->module_core
);
1463 update_protections(current
->mm
);
1467 void *__symbol_get(const char *symbol
)
1469 struct module
*owner
;
1470 const struct kernel_symbol
*sym
;
1473 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1474 if (sym
&& strong_try_module_get(owner
))
1478 return sym
? (void *)sym
->value
: NULL
;
1480 EXPORT_SYMBOL_GPL(__symbol_get
);
1483 * Ensure that an exported symbol [global namespace] does not already exist
1484 * in the kernel or in some other module's exported symbol table.
1486 static int verify_export_symbols(struct module
*mod
)
1489 struct module
*owner
;
1490 const struct kernel_symbol
*s
;
1492 const struct kernel_symbol
*sym
;
1495 { mod
->syms
, mod
->num_syms
},
1496 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1497 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1498 #ifdef CONFIG_UNUSED_SYMBOLS
1499 { mod
->unused_syms
, mod
->num_unused_syms
},
1500 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1504 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1505 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1506 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1508 "%s: exports duplicate symbol %s"
1510 mod
->name
, s
->name
, module_name(owner
));
1518 /* Change all symbols so that st_value encodes the pointer directly. */
1519 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1520 unsigned int symindex
,
1522 unsigned int versindex
,
1523 unsigned int pcpuindex
,
1526 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1527 unsigned long secbase
;
1528 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1530 const struct kernel_symbol
*ksym
;
1532 for (i
= 1; i
< n
; i
++) {
1533 switch (sym
[i
].st_shndx
) {
1535 /* We compiled with -fno-common. These are not
1536 supposed to happen. */
1537 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1538 printk("%s: please compile with -fno-common\n",
1544 /* Don't need to do anything */
1545 DEBUGP("Absolute symbol: 0x%08lx\n",
1546 (long)sym
[i
].st_value
);
1550 ksym
= resolve_symbol(sechdrs
, versindex
,
1551 strtab
+ sym
[i
].st_name
, mod
);
1552 /* Ok if resolved. */
1554 sym
[i
].st_value
= ksym
->value
;
1559 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1562 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1563 mod
->name
, strtab
+ sym
[i
].st_name
);
1568 /* Divert to percpu allocation if a percpu var. */
1569 if (sym
[i
].st_shndx
== pcpuindex
)
1570 secbase
= (unsigned long)mod_percpu(mod
);
1572 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1573 sym
[i
].st_value
+= secbase
;
1581 /* Additional bytes needed by arch in front of individual sections */
1582 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1583 unsigned int section
)
1585 /* default implementation just returns zero */
1589 /* Update size with this section: return offset. */
1590 static long get_offset(struct module
*mod
, unsigned int *size
,
1591 Elf_Shdr
*sechdr
, unsigned int section
)
1595 *size
+= arch_mod_section_prepend(mod
, section
);
1596 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1597 *size
= ret
+ sechdr
->sh_size
;
1601 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1602 might -- code, read-only data, read-write data, small data. Tally
1603 sizes, and place the offsets into sh_entsize fields: high bit means it
1605 static void layout_sections(struct module
*mod
,
1606 const Elf_Ehdr
*hdr
,
1608 const char *secstrings
)
1610 static unsigned long const masks
[][2] = {
1611 /* NOTE: all executable code must be the first section
1612 * in this array; otherwise modify the text_size
1613 * finder in the two loops below */
1614 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1615 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1616 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1617 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1621 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1622 sechdrs
[i
].sh_entsize
= ~0UL;
1624 DEBUGP("Core section allocation order:\n");
1625 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1626 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1627 Elf_Shdr
*s
= &sechdrs
[i
];
1629 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1630 || (s
->sh_flags
& masks
[m
][1])
1631 || s
->sh_entsize
!= ~0UL
1632 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1634 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1635 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1638 mod
->core_text_size
= mod
->core_size
;
1641 DEBUGP("Init section allocation order:\n");
1642 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1643 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1644 Elf_Shdr
*s
= &sechdrs
[i
];
1646 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1647 || (s
->sh_flags
& masks
[m
][1])
1648 || s
->sh_entsize
!= ~0UL
1649 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1651 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1652 | INIT_OFFSET_MASK
);
1653 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1656 mod
->init_text_size
= mod
->init_size
;
1660 static void set_license(struct module
*mod
, const char *license
)
1663 license
= "unspecified";
1665 if (!license_is_gpl_compatible(license
)) {
1666 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1667 printk(KERN_WARNING
"%s: module license '%s' taints "
1668 "kernel.\n", mod
->name
, license
);
1669 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1673 /* Parse tag=value strings from .modinfo section */
1674 static char *next_string(char *string
, unsigned long *secsize
)
1676 /* Skip non-zero chars */
1679 if ((*secsize
)-- <= 1)
1683 /* Skip any zero padding. */
1684 while (!string
[0]) {
1686 if ((*secsize
)-- <= 1)
1692 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1697 unsigned int taglen
= strlen(tag
);
1698 unsigned long size
= sechdrs
[info
].sh_size
;
1700 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1701 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1702 return p
+ taglen
+ 1;
1707 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1708 unsigned int infoindex
)
1710 struct module_attribute
*attr
;
1713 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1716 get_modinfo(sechdrs
,
1722 static void free_modinfo(struct module
*mod
)
1724 struct module_attribute
*attr
;
1727 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1733 #ifdef CONFIG_KALLSYMS
1735 /* lookup symbol in given range of kernel_symbols */
1736 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1737 const struct kernel_symbol
*start
,
1738 const struct kernel_symbol
*stop
)
1740 const struct kernel_symbol
*ks
= start
;
1741 for (; ks
< stop
; ks
++)
1742 if (strcmp(ks
->name
, name
) == 0)
1747 static int is_exported(const char *name
, unsigned long value
,
1748 const struct module
*mod
)
1750 const struct kernel_symbol
*ks
;
1752 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1754 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1755 return ks
!= NULL
&& ks
->value
== value
;
1759 static char elf_type(const Elf_Sym
*sym
,
1761 const char *secstrings
,
1764 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1765 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1770 if (sym
->st_shndx
== SHN_UNDEF
)
1772 if (sym
->st_shndx
== SHN_ABS
)
1774 if (sym
->st_shndx
>= SHN_LORESERVE
)
1776 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1778 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1779 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1780 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1782 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1787 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1788 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1793 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1798 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
1801 const Elf_Shdr
*sec
;
1803 if (src
->st_shndx
== SHN_UNDEF
1804 || src
->st_shndx
>= shnum
1808 sec
= sechdrs
+ src
->st_shndx
;
1809 if (!(sec
->sh_flags
& SHF_ALLOC
)
1810 #ifndef CONFIG_KALLSYMS_ALL
1811 || !(sec
->sh_flags
& SHF_EXECINSTR
)
1813 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
1819 static unsigned long layout_symtab(struct module
*mod
,
1821 unsigned int symindex
,
1822 unsigned int strindex
,
1823 const Elf_Ehdr
*hdr
,
1824 const char *secstrings
,
1825 unsigned long *pstroffs
,
1826 unsigned long *strmap
)
1828 unsigned long symoffs
;
1829 Elf_Shdr
*symsect
= sechdrs
+ symindex
;
1830 Elf_Shdr
*strsect
= sechdrs
+ strindex
;
1833 unsigned int i
, nsrc
, ndst
;
1835 /* Put symbol section at end of init part of module. */
1836 symsect
->sh_flags
|= SHF_ALLOC
;
1837 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
1838 symindex
) | INIT_OFFSET_MASK
;
1839 DEBUGP("\t%s\n", secstrings
+ symsect
->sh_name
);
1841 src
= (void *)hdr
+ symsect
->sh_offset
;
1842 nsrc
= symsect
->sh_size
/ sizeof(*src
);
1843 strtab
= (void *)hdr
+ strsect
->sh_offset
;
1844 for (ndst
= i
= 1; i
< nsrc
; ++i
, ++src
)
1845 if (is_core_symbol(src
, sechdrs
, hdr
->e_shnum
)) {
1846 unsigned int j
= src
->st_name
;
1848 while(!__test_and_set_bit(j
, strmap
) && strtab
[j
])
1853 /* Append room for core symbols at end of core part. */
1854 symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
1855 mod
->core_size
= symoffs
+ ndst
* sizeof(Elf_Sym
);
1857 /* Put string table section at end of init part of module. */
1858 strsect
->sh_flags
|= SHF_ALLOC
;
1859 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
1860 strindex
) | INIT_OFFSET_MASK
;
1861 DEBUGP("\t%s\n", secstrings
+ strsect
->sh_name
);
1863 /* Append room for core symbols' strings at end of core part. */
1864 *pstroffs
= mod
->core_size
;
1865 __set_bit(0, strmap
);
1866 mod
->core_size
+= bitmap_weight(strmap
, strsect
->sh_size
);
1871 static void add_kallsyms(struct module
*mod
,
1874 unsigned int symindex
,
1875 unsigned int strindex
,
1876 unsigned long symoffs
,
1877 unsigned long stroffs
,
1878 const char *secstrings
,
1879 unsigned long *strmap
)
1881 unsigned int i
, ndst
;
1886 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1887 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1888 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1890 /* Set types up while we still have access to sections. */
1891 for (i
= 0; i
< mod
->num_symtab
; i
++)
1892 mod
->symtab
[i
].st_info
1893 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1895 mod
->core_symtab
= dst
= mod
->module_core
+ symoffs
;
1898 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
1899 if (!is_core_symbol(src
, sechdrs
, shnum
))
1902 dst
[ndst
].st_name
= bitmap_weight(strmap
, dst
[ndst
].st_name
);
1905 mod
->core_num_syms
= ndst
;
1907 mod
->core_strtab
= s
= mod
->module_core
+ stroffs
;
1908 for (*s
= 0, i
= 1; i
< sechdrs
[strindex
].sh_size
; ++i
)
1909 if (test_bit(i
, strmap
))
1910 *++s
= mod
->strtab
[i
];
1913 static inline unsigned long layout_symtab(struct module
*mod
,
1915 unsigned int symindex
,
1916 unsigned int strindex
,
1917 const Elf_Ehdr
*hdr
,
1918 const char *secstrings
,
1919 unsigned long *pstroffs
,
1920 unsigned long *strmap
)
1925 static inline void add_kallsyms(struct module
*mod
,
1928 unsigned int symindex
,
1929 unsigned int strindex
,
1930 unsigned long symoffs
,
1931 unsigned long stroffs
,
1932 const char *secstrings
,
1933 const unsigned long *strmap
)
1936 #endif /* CONFIG_KALLSYMS */
1938 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
1940 #ifdef CONFIG_DYNAMIC_DEBUG
1941 if (ddebug_add_module(debug
, num
, debug
->modname
))
1942 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
1947 static void *module_alloc_update_bounds(unsigned long size
)
1949 void *ret
= module_alloc(size
);
1952 /* Update module bounds. */
1953 if ((unsigned long)ret
< module_addr_min
)
1954 module_addr_min
= (unsigned long)ret
;
1955 if ((unsigned long)ret
+ size
> module_addr_max
)
1956 module_addr_max
= (unsigned long)ret
+ size
;
1961 #ifdef CONFIG_DEBUG_KMEMLEAK
1962 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1963 Elf_Shdr
*sechdrs
, char *secstrings
)
1967 /* only scan the sections containing data */
1968 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
1970 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1971 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1973 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
1974 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
1977 kmemleak_scan_area((void *)sechdrs
[i
].sh_addr
,
1978 sechdrs
[i
].sh_size
, GFP_KERNEL
);
1982 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1983 Elf_Shdr
*sechdrs
, char *secstrings
)
1988 /* Allocate and load the module: note that size of section 0 is always
1989 zero, and we rely on this for optional sections. */
1990 static noinline
struct module
*load_module(void __user
*umod
,
1992 const char __user
*uargs
)
1996 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1999 unsigned int symindex
= 0;
2000 unsigned int strindex
= 0;
2001 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
2004 void *ptr
= NULL
; /* Stops spurious gcc warning */
2005 unsigned long symoffs
, stroffs
, *strmap
;
2007 mm_segment_t old_fs
;
2009 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2011 if (len
< sizeof(*hdr
))
2012 return ERR_PTR(-ENOEXEC
);
2014 /* Suck in entire file: we'll want most of it. */
2015 /* vmalloc barfs on "unusual" numbers. Check here */
2016 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
2017 return ERR_PTR(-ENOMEM
);
2019 if (copy_from_user(hdr
, umod
, len
) != 0) {
2024 /* Sanity checks against insmoding binaries or wrong arch,
2025 weird elf version */
2026 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2027 || hdr
->e_type
!= ET_REL
2028 || !elf_check_arch(hdr
)
2029 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
2034 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
2037 /* Convenience variables */
2038 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
2039 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
2040 sechdrs
[0].sh_addr
= 0;
2042 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2043 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
2044 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
2047 /* Mark all sections sh_addr with their address in the
2049 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
2051 /* Internal symbols and strings. */
2052 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2054 strindex
= sechdrs
[i
].sh_link
;
2055 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
2057 #ifndef CONFIG_MODULE_UNLOAD
2058 /* Don't load .exit sections */
2059 if (strstarts(secstrings
+sechdrs
[i
].sh_name
, ".exit"))
2060 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2064 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
2065 ".gnu.linkonce.this_module");
2067 printk(KERN_WARNING
"No module found in object\n");
2071 /* This is temporary: point mod into copy of data. */
2072 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2074 if (symindex
== 0) {
2075 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2081 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
2082 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
2083 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
2085 /* Don't keep modinfo and version sections. */
2086 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2087 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2089 /* Check module struct version now, before we try to use module. */
2090 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
2095 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2096 /* This is allowed: modprobe --force will invalidate it. */
2098 err
= try_to_force_load(mod
, "bad vermagic");
2101 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2102 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2103 mod
->name
, modmagic
, vermagic
);
2108 staging
= get_modinfo(sechdrs
, infoindex
, "staging");
2110 add_taint_module(mod
, TAINT_CRAP
);
2111 printk(KERN_WARNING
"%s: module is from the staging directory,"
2112 " the quality is unknown, you have been warned.\n",
2116 /* Now copy in args */
2117 args
= strndup_user(uargs
, ~0UL >> 1);
2119 err
= PTR_ERR(args
);
2123 strmap
= kzalloc(BITS_TO_LONGS(sechdrs
[strindex
].sh_size
)
2124 * sizeof(long), GFP_KERNEL
);
2130 if (find_module(mod
->name
)) {
2135 mod
->state
= MODULE_STATE_COMING
;
2137 /* Allow arches to frob section contents and sizes. */
2138 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2143 /* We have a special allocation for this section. */
2144 err
= percpu_modalloc(mod
, sechdrs
[pcpuindex
].sh_size
,
2145 sechdrs
[pcpuindex
].sh_addralign
);
2148 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2151 /* Determine total sizes, and put offsets in sh_entsize. For now
2152 this is done generically; there doesn't appear to be any
2153 special cases for the architectures. */
2154 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2155 symoffs
= layout_symtab(mod
, sechdrs
, symindex
, strindex
, hdr
,
2156 secstrings
, &stroffs
, strmap
);
2158 /* Do the allocs. */
2159 ptr
= module_alloc_update_bounds(mod
->core_size
);
2161 * The pointer to this block is stored in the module structure
2162 * which is inside the block. Just mark it as not being a
2165 kmemleak_not_leak(ptr
);
2170 memset(ptr
, 0, mod
->core_size
);
2171 mod
->module_core
= ptr
;
2173 ptr
= module_alloc_update_bounds(mod
->init_size
);
2175 * The pointer to this block is stored in the module structure
2176 * which is inside the block. This block doesn't need to be
2177 * scanned as it contains data and code that will be freed
2178 * after the module is initialized.
2180 kmemleak_ignore(ptr
);
2181 if (!ptr
&& mod
->init_size
) {
2185 memset(ptr
, 0, mod
->init_size
);
2186 mod
->module_init
= ptr
;
2188 /* Transfer each section which specifies SHF_ALLOC */
2189 DEBUGP("final section addresses:\n");
2190 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2193 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2196 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2197 dest
= mod
->module_init
2198 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2200 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2202 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2203 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2204 sechdrs
[i
].sh_size
);
2205 /* Update sh_addr to point to copy in image. */
2206 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2207 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2209 /* Module has been moved. */
2210 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2211 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2213 #if defined(CONFIG_MODULE_UNLOAD)
2214 mod
->refptr
= alloc_percpu(struct module_ref
);
2220 /* Now we've moved module, initialize linked lists, etc. */
2221 module_unload_init(mod
);
2223 /* add kobject, so we can reference it. */
2224 err
= mod_sysfs_init(mod
);
2228 /* Set up license info based on the info section */
2229 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2232 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2233 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2234 * using GPL-only symbols it needs.
2236 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2237 add_taint(TAINT_PROPRIETARY_MODULE
);
2239 /* driverloader was caught wrongly pretending to be under GPL */
2240 if (strcmp(mod
->name
, "driverloader") == 0)
2241 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2243 /* Set up MODINFO_ATTR fields */
2244 setup_modinfo(mod
, sechdrs
, infoindex
);
2246 /* Fix up syms, so that st_value is a pointer to location. */
2247 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2252 /* Now we've got everything in the final locations, we can
2253 * find optional sections. */
2254 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2255 sizeof(*mod
->kp
), &mod
->num_kp
);
2256 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2257 sizeof(*mod
->syms
), &mod
->num_syms
);
2258 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2259 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2260 sizeof(*mod
->gpl_syms
),
2261 &mod
->num_gpl_syms
);
2262 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2263 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2264 "__ksymtab_gpl_future",
2265 sizeof(*mod
->gpl_future_syms
),
2266 &mod
->num_gpl_future_syms
);
2267 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2268 "__kcrctab_gpl_future");
2270 #ifdef CONFIG_UNUSED_SYMBOLS
2271 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2273 sizeof(*mod
->unused_syms
),
2274 &mod
->num_unused_syms
);
2275 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2276 "__kcrctab_unused");
2277 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2278 "__ksymtab_unused_gpl",
2279 sizeof(*mod
->unused_gpl_syms
),
2280 &mod
->num_unused_gpl_syms
);
2281 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2282 "__kcrctab_unused_gpl");
2284 #ifdef CONFIG_CONSTRUCTORS
2285 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2286 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2289 #ifdef CONFIG_TRACEPOINTS
2290 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2292 sizeof(*mod
->tracepoints
),
2293 &mod
->num_tracepoints
);
2295 #ifdef CONFIG_EVENT_TRACING
2296 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2298 sizeof(*mod
->trace_events
),
2299 &mod
->num_trace_events
);
2301 * This section contains pointers to allocated objects in the trace
2302 * code and not scanning it leads to false positives.
2304 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2305 mod
->num_trace_events
, GFP_KERNEL
);
2307 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2308 /* sechdrs[0].sh_size is always zero */
2309 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2311 sizeof(*mod
->ftrace_callsites
),
2312 &mod
->num_ftrace_callsites
);
2314 #ifdef CONFIG_MODVERSIONS
2315 if ((mod
->num_syms
&& !mod
->crcs
)
2316 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2317 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2318 #ifdef CONFIG_UNUSED_SYMBOLS
2319 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2320 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2323 err
= try_to_force_load(mod
,
2324 "no versions for exported symbols");
2330 /* Now do relocations. */
2331 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2332 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2333 unsigned int info
= sechdrs
[i
].sh_info
;
2335 /* Not a valid relocation section? */
2336 if (info
>= hdr
->e_shnum
)
2339 /* Don't bother with non-allocated sections */
2340 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2343 if (sechdrs
[i
].sh_type
== SHT_REL
)
2344 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2345 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2346 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2352 /* Find duplicate symbols */
2353 err
= verify_export_symbols(mod
);
2357 /* Set up and sort exception table */
2358 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2359 sizeof(*mod
->extable
), &mod
->num_exentries
);
2360 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2362 /* Finally, copy percpu area over. */
2363 percpu_modcopy(mod
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2364 sechdrs
[pcpuindex
].sh_size
);
2366 add_kallsyms(mod
, sechdrs
, hdr
->e_shnum
, symindex
, strindex
,
2367 symoffs
, stroffs
, secstrings
, strmap
);
2372 struct _ddebug
*debug
;
2373 unsigned int num_debug
;
2375 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2376 sizeof(*debug
), &num_debug
);
2378 dynamic_debug_setup(debug
, num_debug
);
2381 err
= module_finalize(hdr
, sechdrs
, mod
);
2385 /* flush the icache in correct context */
2390 * Flush the instruction cache, since we've played with text.
2391 * Do it before processing of module parameters, so the module
2392 * can provide parameter accessor functions of its own.
2394 if (mod
->module_init
)
2395 flush_icache_range((unsigned long)mod
->module_init
,
2396 (unsigned long)mod
->module_init
2398 flush_icache_range((unsigned long)mod
->module_core
,
2399 (unsigned long)mod
->module_core
+ mod
->core_size
);
2404 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2405 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2408 /* Now sew it into the lists so we can get lockdep and oops
2409 * info during argument parsing. Noone should access us, since
2410 * strong_try_module_get() will fail.
2411 * lockdep/oops can run asynchronous, so use the RCU list insertion
2412 * function to insert in a way safe to concurrent readers.
2413 * The mutex protects against concurrent writers.
2415 list_add_rcu(&mod
->list
, &modules
);
2417 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2421 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2424 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2425 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2427 /* Get rid of temporary copy */
2430 trace_module_load(mod
);
2436 /* Unlink carefully: kallsyms could be walking list. */
2437 list_del_rcu(&mod
->list
);
2438 synchronize_sched();
2439 module_arch_cleanup(mod
);
2442 kobject_del(&mod
->mkobj
.kobj
);
2443 kobject_put(&mod
->mkobj
.kobj
);
2445 module_unload_free(mod
);
2446 #if defined(CONFIG_MODULE_UNLOAD)
2447 free_percpu(mod
->refptr
);
2450 module_free(mod
, mod
->module_init
);
2452 module_free(mod
, mod
->module_core
);
2453 /* mod will be freed with core. Don't access it beyond this line! */
2455 percpu_modfree(mod
);
2461 return ERR_PTR(err
);
2464 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2469 /* Call module constructors. */
2470 static void do_mod_ctors(struct module
*mod
)
2472 #ifdef CONFIG_CONSTRUCTORS
2475 for (i
= 0; i
< mod
->num_ctors
; i
++)
2480 /* This is where the real work happens */
2481 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2482 unsigned long, len
, const char __user
*, uargs
)
2487 /* Must have permission */
2488 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2491 /* Only one module load at a time, please */
2492 if (mutex_lock_interruptible(&module_mutex
) != 0)
2495 /* Do all the hard work */
2496 mod
= load_module(umod
, len
, uargs
);
2498 mutex_unlock(&module_mutex
);
2499 return PTR_ERR(mod
);
2502 /* Drop lock so they can recurse */
2503 mutex_unlock(&module_mutex
);
2505 blocking_notifier_call_chain(&module_notify_list
,
2506 MODULE_STATE_COMING
, mod
);
2509 /* Start the module */
2510 if (mod
->init
!= NULL
)
2511 ret
= do_one_initcall(mod
->init
);
2513 /* Init routine failed: abort. Try to protect us from
2514 buggy refcounters. */
2515 mod
->state
= MODULE_STATE_GOING
;
2516 synchronize_sched();
2518 blocking_notifier_call_chain(&module_notify_list
,
2519 MODULE_STATE_GOING
, mod
);
2520 mutex_lock(&module_mutex
);
2522 mutex_unlock(&module_mutex
);
2523 wake_up(&module_wq
);
2528 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2529 "%s: loading module anyway...\n",
2530 __func__
, mod
->name
, ret
,
2535 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2536 mod
->state
= MODULE_STATE_LIVE
;
2537 wake_up(&module_wq
);
2538 blocking_notifier_call_chain(&module_notify_list
,
2539 MODULE_STATE_LIVE
, mod
);
2541 /* We need to finish all async code before the module init sequence is done */
2542 async_synchronize_full();
2544 mutex_lock(&module_mutex
);
2545 /* Drop initial reference. */
2547 trim_init_extable(mod
);
2548 #ifdef CONFIG_KALLSYMS
2549 mod
->num_symtab
= mod
->core_num_syms
;
2550 mod
->symtab
= mod
->core_symtab
;
2551 mod
->strtab
= mod
->core_strtab
;
2553 module_free(mod
, mod
->module_init
);
2554 mod
->module_init
= NULL
;
2556 mod
->init_text_size
= 0;
2557 mutex_unlock(&module_mutex
);
2562 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2564 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2567 #ifdef CONFIG_KALLSYMS
2569 * This ignores the intensely annoying "mapping symbols" found
2570 * in ARM ELF files: $a, $t and $d.
2572 static inline int is_arm_mapping_symbol(const char *str
)
2574 return str
[0] == '$' && strchr("atd", str
[1])
2575 && (str
[2] == '\0' || str
[2] == '.');
2578 static const char *get_ksymbol(struct module
*mod
,
2580 unsigned long *size
,
2581 unsigned long *offset
)
2583 unsigned int i
, best
= 0;
2584 unsigned long nextval
;
2586 /* At worse, next value is at end of module */
2587 if (within_module_init(addr
, mod
))
2588 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2590 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2592 /* Scan for closest preceeding symbol, and next symbol. (ELF
2593 starts real symbols at 1). */
2594 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2595 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2598 /* We ignore unnamed symbols: they're uninformative
2599 * and inserted at a whim. */
2600 if (mod
->symtab
[i
].st_value
<= addr
2601 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2602 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2603 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2605 if (mod
->symtab
[i
].st_value
> addr
2606 && mod
->symtab
[i
].st_value
< nextval
2607 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2608 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2609 nextval
= mod
->symtab
[i
].st_value
;
2616 *size
= nextval
- mod
->symtab
[best
].st_value
;
2618 *offset
= addr
- mod
->symtab
[best
].st_value
;
2619 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2622 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2623 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2624 const char *module_address_lookup(unsigned long addr
,
2625 unsigned long *size
,
2626 unsigned long *offset
,
2631 const char *ret
= NULL
;
2634 list_for_each_entry_rcu(mod
, &modules
, list
) {
2635 if (within_module_init(addr
, mod
) ||
2636 within_module_core(addr
, mod
)) {
2638 *modname
= mod
->name
;
2639 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2643 /* Make a copy in here where it's safe */
2645 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2652 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2657 list_for_each_entry_rcu(mod
, &modules
, list
) {
2658 if (within_module_init(addr
, mod
) ||
2659 within_module_core(addr
, mod
)) {
2662 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2665 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2675 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2676 unsigned long *offset
, char *modname
, char *name
)
2681 list_for_each_entry_rcu(mod
, &modules
, list
) {
2682 if (within_module_init(addr
, mod
) ||
2683 within_module_core(addr
, mod
)) {
2686 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2690 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2692 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2702 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2703 char *name
, char *module_name
, int *exported
)
2708 list_for_each_entry_rcu(mod
, &modules
, list
) {
2709 if (symnum
< mod
->num_symtab
) {
2710 *value
= mod
->symtab
[symnum
].st_value
;
2711 *type
= mod
->symtab
[symnum
].st_info
;
2712 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2714 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2715 *exported
= is_exported(name
, *value
, mod
);
2719 symnum
-= mod
->num_symtab
;
2725 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2729 for (i
= 0; i
< mod
->num_symtab
; i
++)
2730 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2731 mod
->symtab
[i
].st_info
!= 'U')
2732 return mod
->symtab
[i
].st_value
;
2736 /* Look for this name: can be of form module:name. */
2737 unsigned long module_kallsyms_lookup_name(const char *name
)
2741 unsigned long ret
= 0;
2743 /* Don't lock: we're in enough trouble already. */
2745 if ((colon
= strchr(name
, ':')) != NULL
) {
2747 if ((mod
= find_module(name
)) != NULL
)
2748 ret
= mod_find_symname(mod
, colon
+1);
2751 list_for_each_entry_rcu(mod
, &modules
, list
)
2752 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2759 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2760 struct module
*, unsigned long),
2767 list_for_each_entry(mod
, &modules
, list
) {
2768 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2769 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2770 mod
, mod
->symtab
[i
].st_value
);
2777 #endif /* CONFIG_KALLSYMS */
2779 static char *module_flags(struct module
*mod
, char *buf
)
2784 mod
->state
== MODULE_STATE_GOING
||
2785 mod
->state
== MODULE_STATE_COMING
) {
2787 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2789 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2791 if (mod
->taints
& (1 << TAINT_CRAP
))
2794 * TAINT_FORCED_RMMOD: could be added.
2795 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2799 /* Show a - for module-is-being-unloaded */
2800 if (mod
->state
== MODULE_STATE_GOING
)
2802 /* Show a + for module-is-being-loaded */
2803 if (mod
->state
== MODULE_STATE_COMING
)
2812 #ifdef CONFIG_PROC_FS
2813 /* Called by the /proc file system to return a list of modules. */
2814 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2816 mutex_lock(&module_mutex
);
2817 return seq_list_start(&modules
, *pos
);
2820 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2822 return seq_list_next(p
, &modules
, pos
);
2825 static void m_stop(struct seq_file
*m
, void *p
)
2827 mutex_unlock(&module_mutex
);
2830 static int m_show(struct seq_file
*m
, void *p
)
2832 struct module
*mod
= list_entry(p
, struct module
, list
);
2835 seq_printf(m
, "%s %u",
2836 mod
->name
, mod
->init_size
+ mod
->core_size
);
2837 print_unload_info(m
, mod
);
2839 /* Informative for users. */
2840 seq_printf(m
, " %s",
2841 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2842 mod
->state
== MODULE_STATE_COMING
? "Loading":
2844 /* Used by oprofile and other similar tools. */
2845 seq_printf(m
, " 0x%p", mod
->module_core
);
2849 seq_printf(m
, " %s", module_flags(mod
, buf
));
2851 seq_printf(m
, "\n");
2855 /* Format: modulename size refcount deps address
2857 Where refcount is a number or -, and deps is a comma-separated list
2860 static const struct seq_operations modules_op
= {
2867 static int modules_open(struct inode
*inode
, struct file
*file
)
2869 return seq_open(file
, &modules_op
);
2872 static const struct file_operations proc_modules_operations
= {
2873 .open
= modules_open
,
2875 .llseek
= seq_lseek
,
2876 .release
= seq_release
,
2879 static int __init
proc_modules_init(void)
2881 proc_create("modules", 0, NULL
, &proc_modules_operations
);
2884 module_init(proc_modules_init
);
2887 /* Given an address, look for it in the module exception tables. */
2888 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2890 const struct exception_table_entry
*e
= NULL
;
2894 list_for_each_entry_rcu(mod
, &modules
, list
) {
2895 if (mod
->num_exentries
== 0)
2898 e
= search_extable(mod
->extable
,
2899 mod
->extable
+ mod
->num_exentries
- 1,
2906 /* Now, if we found one, we are running inside it now, hence
2907 we cannot unload the module, hence no refcnt needed. */
2912 * is_module_address - is this address inside a module?
2913 * @addr: the address to check.
2915 * See is_module_text_address() if you simply want to see if the address
2916 * is code (not data).
2918 bool is_module_address(unsigned long addr
)
2923 ret
= __module_address(addr
) != NULL
;
2930 * __module_address - get the module which contains an address.
2931 * @addr: the address.
2933 * Must be called with preempt disabled or module mutex held so that
2934 * module doesn't get freed during this.
2936 struct module
*__module_address(unsigned long addr
)
2940 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2943 list_for_each_entry_rcu(mod
, &modules
, list
)
2944 if (within_module_core(addr
, mod
)
2945 || within_module_init(addr
, mod
))
2949 EXPORT_SYMBOL_GPL(__module_address
);
2952 * is_module_text_address - is this address inside module code?
2953 * @addr: the address to check.
2955 * See is_module_address() if you simply want to see if the address is
2956 * anywhere in a module. See kernel_text_address() for testing if an
2957 * address corresponds to kernel or module code.
2959 bool is_module_text_address(unsigned long addr
)
2964 ret
= __module_text_address(addr
) != NULL
;
2971 * __module_text_address - get the module whose code contains an address.
2972 * @addr: the address.
2974 * Must be called with preempt disabled or module mutex held so that
2975 * module doesn't get freed during this.
2977 struct module
*__module_text_address(unsigned long addr
)
2979 struct module
*mod
= __module_address(addr
);
2981 /* Make sure it's within the text section. */
2982 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
2983 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
2988 EXPORT_SYMBOL_GPL(__module_text_address
);
2990 /* Don't grab lock, we're oopsing. */
2991 void print_modules(void)
2996 printk(KERN_DEFAULT
"Modules linked in:");
2997 /* Most callers should already have preempt disabled, but make sure */
2999 list_for_each_entry_rcu(mod
, &modules
, list
)
3000 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3002 if (last_unloaded_module
[0])
3003 printk(" [last unloaded: %s]", last_unloaded_module
);
3007 #ifdef CONFIG_MODVERSIONS
3008 /* Generate the signature for all relevant module structures here.
3009 * If these change, we don't want to try to parse the module. */
3010 void module_layout(struct module
*mod
,
3011 struct modversion_info
*ver
,
3012 struct kernel_param
*kp
,
3013 struct kernel_symbol
*ks
,
3014 struct tracepoint
*tp
)
3017 EXPORT_SYMBOL(module_layout
);
3020 #ifdef CONFIG_TRACEPOINTS
3021 void module_update_tracepoints(void)
3025 mutex_lock(&module_mutex
);
3026 list_for_each_entry(mod
, &modules
, list
)
3028 tracepoint_update_probe_range(mod
->tracepoints
,
3029 mod
->tracepoints
+ mod
->num_tracepoints
);
3030 mutex_unlock(&module_mutex
);
3034 * Returns 0 if current not found.
3035 * Returns 1 if current found.
3037 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
3039 struct module
*iter_mod
;
3042 mutex_lock(&module_mutex
);
3043 list_for_each_entry(iter_mod
, &modules
, list
) {
3044 if (!iter_mod
->taints
) {
3046 * Sorted module list
3048 if (iter_mod
< iter
->module
)
3050 else if (iter_mod
> iter
->module
)
3051 iter
->tracepoint
= NULL
;
3052 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
3053 iter_mod
->tracepoints
,
3054 iter_mod
->tracepoints
3055 + iter_mod
->num_tracepoints
);
3057 iter
->module
= iter_mod
;
3062 mutex_unlock(&module_mutex
);