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
);
418 #else /* ... !CONFIG_SMP */
420 static inline void __percpu
*mod_percpu(struct module
*mod
)
424 static inline int percpu_modalloc(struct module
*mod
,
425 unsigned long size
, unsigned long align
)
429 static inline void percpu_modfree(struct module
*mod
)
432 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
434 const char *secstrings
)
438 static inline void percpu_modcopy(struct module
*mod
,
439 const void *from
, unsigned long size
)
441 /* pcpusec should be 0, and size of that section should be 0. */
445 #endif /* CONFIG_SMP */
447 #define MODINFO_ATTR(field) \
448 static void setup_modinfo_##field(struct module *mod, const char *s) \
450 mod->field = kstrdup(s, GFP_KERNEL); \
452 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
453 struct module *mod, char *buffer) \
455 return sprintf(buffer, "%s\n", mod->field); \
457 static int modinfo_##field##_exists(struct module *mod) \
459 return mod->field != NULL; \
461 static void free_modinfo_##field(struct module *mod) \
466 static struct module_attribute modinfo_##field = { \
467 .attr = { .name = __stringify(field), .mode = 0444 }, \
468 .show = show_modinfo_##field, \
469 .setup = setup_modinfo_##field, \
470 .test = modinfo_##field##_exists, \
471 .free = free_modinfo_##field, \
474 MODINFO_ATTR(version
);
475 MODINFO_ATTR(srcversion
);
477 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
479 #ifdef CONFIG_MODULE_UNLOAD
480 /* Init the unload section of the module. */
481 static void module_unload_init(struct module
*mod
)
485 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
486 for_each_possible_cpu(cpu
)
487 per_cpu_ptr(mod
->refptr
, cpu
)->count
= 0;
489 /* Hold reference count during initialization. */
490 __this_cpu_write(mod
->refptr
->count
, 1);
491 /* Backwards compatibility macros put refcount during init. */
492 mod
->waiter
= current
;
495 /* modules using other modules */
498 struct list_head list
;
499 struct module
*module_which_uses
;
502 /* Does a already use b? */
503 static int already_uses(struct module
*a
, struct module
*b
)
505 struct module_use
*use
;
507 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
508 if (use
->module_which_uses
== a
) {
509 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
513 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
517 /* Module a uses b */
518 int use_module(struct module
*a
, struct module
*b
)
520 struct module_use
*use
;
523 if (b
== NULL
|| already_uses(a
, b
)) return 1;
525 /* If we're interrupted or time out, we fail. */
526 if (wait_event_interruptible_timeout(
527 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
529 printk("%s: gave up waiting for init of module %s.\n",
534 /* If strong_try_module_get() returned a different error, we fail. */
538 DEBUGP("Allocating new usage for %s.\n", a
->name
);
539 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
541 printk("%s: out of memory loading\n", a
->name
);
546 use
->module_which_uses
= a
;
547 list_add(&use
->list
, &b
->modules_which_use_me
);
548 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
551 EXPORT_SYMBOL_GPL(use_module
);
553 /* Clear the unload stuff of the module. */
554 static void module_unload_free(struct module
*mod
)
558 list_for_each_entry(i
, &modules
, list
) {
559 struct module_use
*use
;
561 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
562 if (use
->module_which_uses
== mod
) {
563 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
565 list_del(&use
->list
);
567 sysfs_remove_link(i
->holders_dir
, mod
->name
);
568 /* There can be at most one match. */
575 #ifdef CONFIG_MODULE_FORCE_UNLOAD
576 static inline int try_force_unload(unsigned int flags
)
578 int ret
= (flags
& O_TRUNC
);
580 add_taint(TAINT_FORCED_RMMOD
);
584 static inline int try_force_unload(unsigned int flags
)
588 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
597 /* Whole machine is stopped with interrupts off when this runs. */
598 static int __try_stop_module(void *_sref
)
600 struct stopref
*sref
= _sref
;
602 /* If it's not unused, quit unless we're forcing. */
603 if (module_refcount(sref
->mod
) != 0) {
604 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
608 /* Mark it as dying. */
609 sref
->mod
->state
= MODULE_STATE_GOING
;
613 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
615 if (flags
& O_NONBLOCK
) {
616 struct stopref sref
= { mod
, flags
, forced
};
618 return stop_machine(__try_stop_module
, &sref
, NULL
);
620 /* We don't need to stop the machine for this. */
621 mod
->state
= MODULE_STATE_GOING
;
627 unsigned int module_refcount(struct module
*mod
)
629 unsigned int total
= 0;
632 for_each_possible_cpu(cpu
)
633 total
+= per_cpu_ptr(mod
->refptr
, cpu
)->count
;
636 EXPORT_SYMBOL(module_refcount
);
638 /* This exists whether we can unload or not */
639 static void free_module(struct module
*mod
);
641 static void wait_for_zero_refcount(struct module
*mod
)
643 /* Since we might sleep for some time, release the mutex first */
644 mutex_unlock(&module_mutex
);
646 DEBUGP("Looking at refcount...\n");
647 set_current_state(TASK_UNINTERRUPTIBLE
);
648 if (module_refcount(mod
) == 0)
652 current
->state
= TASK_RUNNING
;
653 mutex_lock(&module_mutex
);
656 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
660 char name
[MODULE_NAME_LEN
];
663 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
666 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
668 name
[MODULE_NAME_LEN
-1] = '\0';
670 /* Create stop_machine threads since free_module relies on
671 * a non-failing stop_machine call. */
672 ret
= stop_machine_create();
676 if (mutex_lock_interruptible(&module_mutex
) != 0) {
681 mod
= find_module(name
);
687 if (!list_empty(&mod
->modules_which_use_me
)) {
688 /* Other modules depend on us: get rid of them first. */
693 /* Doing init or already dying? */
694 if (mod
->state
!= MODULE_STATE_LIVE
) {
695 /* FIXME: if (force), slam module count and wake up
697 DEBUGP("%s already dying\n", mod
->name
);
702 /* If it has an init func, it must have an exit func to unload */
703 if (mod
->init
&& !mod
->exit
) {
704 forced
= try_force_unload(flags
);
706 /* This module can't be removed */
712 /* Set this up before setting mod->state */
713 mod
->waiter
= current
;
715 /* Stop the machine so refcounts can't move and disable module. */
716 ret
= try_stop_module(mod
, flags
, &forced
);
720 /* Never wait if forced. */
721 if (!forced
&& module_refcount(mod
) != 0)
722 wait_for_zero_refcount(mod
);
724 mutex_unlock(&module_mutex
);
725 /* Final destruction now noone is using it. */
726 if (mod
->exit
!= NULL
)
728 blocking_notifier_call_chain(&module_notify_list
,
729 MODULE_STATE_GOING
, mod
);
730 async_synchronize_full();
731 mutex_lock(&module_mutex
);
732 /* Store the name of the last unloaded module for diagnostic purposes */
733 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
734 ddebug_remove_module(mod
->name
);
738 mutex_unlock(&module_mutex
);
740 stop_machine_destroy();
744 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
746 struct module_use
*use
;
747 int printed_something
= 0;
749 seq_printf(m
, " %u ", module_refcount(mod
));
751 /* Always include a trailing , so userspace can differentiate
752 between this and the old multi-field proc format. */
753 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
754 printed_something
= 1;
755 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
758 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
759 printed_something
= 1;
760 seq_printf(m
, "[permanent],");
763 if (!printed_something
)
767 void __symbol_put(const char *symbol
)
769 struct module
*owner
;
772 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
777 EXPORT_SYMBOL(__symbol_put
);
779 /* Note this assumes addr is a function, which it currently always is. */
780 void symbol_put_addr(void *addr
)
782 struct module
*modaddr
;
783 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
785 if (core_kernel_text(a
))
788 /* module_text_address is safe here: we're supposed to have reference
789 * to module from symbol_get, so it can't go away. */
790 modaddr
= __module_text_address(a
);
794 EXPORT_SYMBOL_GPL(symbol_put_addr
);
796 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
797 struct module
*mod
, char *buffer
)
799 return sprintf(buffer
, "%u\n", module_refcount(mod
));
802 static struct module_attribute refcnt
= {
803 .attr
= { .name
= "refcnt", .mode
= 0444 },
807 void module_put(struct module
*module
)
811 __this_cpu_dec(module
->refptr
->count
);
813 trace_module_put(module
, _RET_IP_
,
814 __this_cpu_read(module
->refptr
->count
));
815 /* Maybe they're waiting for us to drop reference? */
816 if (unlikely(!module_is_live(module
)))
817 wake_up_process(module
->waiter
);
821 EXPORT_SYMBOL(module_put
);
823 #else /* !CONFIG_MODULE_UNLOAD */
824 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
826 /* We don't know the usage count, or what modules are using. */
827 seq_printf(m
, " - -");
830 static inline void module_unload_free(struct module
*mod
)
834 int use_module(struct module
*a
, struct module
*b
)
836 return strong_try_module_get(b
) == 0;
838 EXPORT_SYMBOL_GPL(use_module
);
840 static inline void module_unload_init(struct module
*mod
)
843 #endif /* CONFIG_MODULE_UNLOAD */
845 static ssize_t
show_initstate(struct module_attribute
*mattr
,
846 struct module
*mod
, char *buffer
)
848 const char *state
= "unknown";
850 switch (mod
->state
) {
851 case MODULE_STATE_LIVE
:
854 case MODULE_STATE_COMING
:
857 case MODULE_STATE_GOING
:
861 return sprintf(buffer
, "%s\n", state
);
864 static struct module_attribute initstate
= {
865 .attr
= { .name
= "initstate", .mode
= 0444 },
866 .show
= show_initstate
,
869 static struct module_attribute
*modinfo_attrs
[] = {
873 #ifdef CONFIG_MODULE_UNLOAD
879 static const char vermagic
[] = VERMAGIC_STRING
;
881 static int try_to_force_load(struct module
*mod
, const char *reason
)
883 #ifdef CONFIG_MODULE_FORCE_LOAD
884 if (!test_taint(TAINT_FORCED_MODULE
))
885 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
887 add_taint_module(mod
, TAINT_FORCED_MODULE
);
894 #ifdef CONFIG_MODVERSIONS
895 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
896 static unsigned long maybe_relocated(unsigned long crc
,
897 const struct module
*crc_owner
)
899 #ifdef ARCH_RELOCATES_KCRCTAB
900 if (crc_owner
== NULL
)
901 return crc
- (unsigned long)reloc_start
;
906 static int check_version(Elf_Shdr
*sechdrs
,
907 unsigned int versindex
,
910 const unsigned long *crc
,
911 const struct module
*crc_owner
)
913 unsigned int i
, num_versions
;
914 struct modversion_info
*versions
;
916 /* Exporting module didn't supply crcs? OK, we're already tainted. */
920 /* No versions at all? modprobe --force does this. */
922 return try_to_force_load(mod
, symname
) == 0;
924 versions
= (void *) sechdrs
[versindex
].sh_addr
;
925 num_versions
= sechdrs
[versindex
].sh_size
926 / sizeof(struct modversion_info
);
928 for (i
= 0; i
< num_versions
; i
++) {
929 if (strcmp(versions
[i
].name
, symname
) != 0)
932 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
934 DEBUGP("Found checksum %lX vs module %lX\n",
935 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
939 printk(KERN_WARNING
"%s: no symbol version for %s\n",
944 printk("%s: disagrees about version of symbol %s\n",
949 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
950 unsigned int versindex
,
953 const unsigned long *crc
;
955 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
958 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
962 /* First part is kernel version, which we ignore if module has crcs. */
963 static inline int same_magic(const char *amagic
, const char *bmagic
,
967 amagic
+= strcspn(amagic
, " ");
968 bmagic
+= strcspn(bmagic
, " ");
970 return strcmp(amagic
, bmagic
) == 0;
973 static inline int check_version(Elf_Shdr
*sechdrs
,
974 unsigned int versindex
,
977 const unsigned long *crc
,
978 const struct module
*crc_owner
)
983 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
984 unsigned int versindex
,
990 static inline int same_magic(const char *amagic
, const char *bmagic
,
993 return strcmp(amagic
, bmagic
) == 0;
995 #endif /* CONFIG_MODVERSIONS */
997 /* Resolve a symbol for this module. I.e. if we find one, record usage.
998 Must be holding module_mutex. */
999 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1000 unsigned int versindex
,
1004 struct module
*owner
;
1005 const struct kernel_symbol
*sym
;
1006 const unsigned long *crc
;
1008 sym
= find_symbol(name
, &owner
, &crc
,
1009 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1010 /* use_module can fail due to OOM,
1011 or module initialization or unloading */
1013 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
, owner
)
1014 || !use_module(mod
, owner
))
1021 * /sys/module/foo/sections stuff
1022 * J. Corbet <corbet@lwn.net>
1024 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1026 static inline bool sect_empty(const Elf_Shdr
*sect
)
1028 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1031 struct module_sect_attr
1033 struct module_attribute mattr
;
1035 unsigned long address
;
1038 struct module_sect_attrs
1040 struct attribute_group grp
;
1041 unsigned int nsections
;
1042 struct module_sect_attr attrs
[0];
1045 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1046 struct module
*mod
, char *buf
)
1048 struct module_sect_attr
*sattr
=
1049 container_of(mattr
, struct module_sect_attr
, mattr
);
1050 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1053 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1055 unsigned int section
;
1057 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1058 kfree(sect_attrs
->attrs
[section
].name
);
1062 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1063 char *secstrings
, Elf_Shdr
*sechdrs
)
1065 unsigned int nloaded
= 0, i
, size
[2];
1066 struct module_sect_attrs
*sect_attrs
;
1067 struct module_sect_attr
*sattr
;
1068 struct attribute
**gattr
;
1070 /* Count loaded sections and allocate structures */
1071 for (i
= 0; i
< nsect
; i
++)
1072 if (!sect_empty(&sechdrs
[i
]))
1074 size
[0] = ALIGN(sizeof(*sect_attrs
)
1075 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1076 sizeof(sect_attrs
->grp
.attrs
[0]));
1077 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1078 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1079 if (sect_attrs
== NULL
)
1082 /* Setup section attributes. */
1083 sect_attrs
->grp
.name
= "sections";
1084 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1086 sect_attrs
->nsections
= 0;
1087 sattr
= §_attrs
->attrs
[0];
1088 gattr
= §_attrs
->grp
.attrs
[0];
1089 for (i
= 0; i
< nsect
; i
++) {
1090 if (sect_empty(&sechdrs
[i
]))
1092 sattr
->address
= sechdrs
[i
].sh_addr
;
1093 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1095 if (sattr
->name
== NULL
)
1097 sect_attrs
->nsections
++;
1098 sysfs_attr_init(&sattr
->mattr
.attr
);
1099 sattr
->mattr
.show
= module_sect_show
;
1100 sattr
->mattr
.store
= NULL
;
1101 sattr
->mattr
.attr
.name
= sattr
->name
;
1102 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1103 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1107 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1110 mod
->sect_attrs
= sect_attrs
;
1113 free_sect_attrs(sect_attrs
);
1116 static void remove_sect_attrs(struct module
*mod
)
1118 if (mod
->sect_attrs
) {
1119 sysfs_remove_group(&mod
->mkobj
.kobj
,
1120 &mod
->sect_attrs
->grp
);
1121 /* We are positive that no one is using any sect attrs
1122 * at this point. Deallocate immediately. */
1123 free_sect_attrs(mod
->sect_attrs
);
1124 mod
->sect_attrs
= NULL
;
1129 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1132 struct module_notes_attrs
{
1133 struct kobject
*dir
;
1135 struct bin_attribute attrs
[0];
1138 static ssize_t
module_notes_read(struct kobject
*kobj
,
1139 struct bin_attribute
*bin_attr
,
1140 char *buf
, loff_t pos
, size_t count
)
1143 * The caller checked the pos and count against our size.
1145 memcpy(buf
, bin_attr
->private + pos
, count
);
1149 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1152 if (notes_attrs
->dir
) {
1154 sysfs_remove_bin_file(notes_attrs
->dir
,
1155 ¬es_attrs
->attrs
[i
]);
1156 kobject_put(notes_attrs
->dir
);
1161 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1162 char *secstrings
, Elf_Shdr
*sechdrs
)
1164 unsigned int notes
, loaded
, i
;
1165 struct module_notes_attrs
*notes_attrs
;
1166 struct bin_attribute
*nattr
;
1168 /* failed to create section attributes, so can't create notes */
1169 if (!mod
->sect_attrs
)
1172 /* Count notes sections and allocate structures. */
1174 for (i
= 0; i
< nsect
; i
++)
1175 if (!sect_empty(&sechdrs
[i
]) &&
1176 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1182 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1183 + notes
* sizeof(notes_attrs
->attrs
[0]),
1185 if (notes_attrs
== NULL
)
1188 notes_attrs
->notes
= notes
;
1189 nattr
= ¬es_attrs
->attrs
[0];
1190 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1191 if (sect_empty(&sechdrs
[i
]))
1193 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1194 sysfs_bin_attr_init(nattr
);
1195 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1196 nattr
->attr
.mode
= S_IRUGO
;
1197 nattr
->size
= sechdrs
[i
].sh_size
;
1198 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1199 nattr
->read
= module_notes_read
;
1205 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1206 if (!notes_attrs
->dir
)
1209 for (i
= 0; i
< notes
; ++i
)
1210 if (sysfs_create_bin_file(notes_attrs
->dir
,
1211 ¬es_attrs
->attrs
[i
]))
1214 mod
->notes_attrs
= notes_attrs
;
1218 free_notes_attrs(notes_attrs
, i
);
1221 static void remove_notes_attrs(struct module
*mod
)
1223 if (mod
->notes_attrs
)
1224 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1229 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1230 char *sectstrings
, Elf_Shdr
*sechdrs
)
1234 static inline void remove_sect_attrs(struct module
*mod
)
1238 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1239 char *sectstrings
, Elf_Shdr
*sechdrs
)
1243 static inline void remove_notes_attrs(struct module
*mod
)
1249 int module_add_modinfo_attrs(struct module
*mod
)
1251 struct module_attribute
*attr
;
1252 struct module_attribute
*temp_attr
;
1256 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1257 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1259 if (!mod
->modinfo_attrs
)
1262 temp_attr
= mod
->modinfo_attrs
;
1263 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1265 (attr
->test
&& attr
->test(mod
))) {
1266 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1267 sysfs_attr_init(&temp_attr
->attr
);
1268 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1275 void module_remove_modinfo_attrs(struct module
*mod
)
1277 struct module_attribute
*attr
;
1280 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1281 /* pick a field to test for end of list */
1282 if (!attr
->attr
.name
)
1284 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1288 kfree(mod
->modinfo_attrs
);
1291 int mod_sysfs_init(struct module
*mod
)
1294 struct kobject
*kobj
;
1296 if (!module_sysfs_initialized
) {
1297 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1303 kobj
= kset_find_obj(module_kset
, mod
->name
);
1305 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1311 mod
->mkobj
.mod
= mod
;
1313 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1314 mod
->mkobj
.kobj
.kset
= module_kset
;
1315 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1318 kobject_put(&mod
->mkobj
.kobj
);
1320 /* delay uevent until full sysfs population */
1325 int mod_sysfs_setup(struct module
*mod
,
1326 struct kernel_param
*kparam
,
1327 unsigned int num_params
)
1331 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1332 if (!mod
->holders_dir
) {
1337 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1339 goto out_unreg_holders
;
1341 err
= module_add_modinfo_attrs(mod
);
1343 goto out_unreg_param
;
1345 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1349 module_param_sysfs_remove(mod
);
1351 kobject_put(mod
->holders_dir
);
1353 kobject_put(&mod
->mkobj
.kobj
);
1357 static void mod_sysfs_fini(struct module
*mod
)
1359 kobject_put(&mod
->mkobj
.kobj
);
1362 #else /* CONFIG_SYSFS */
1364 static void mod_sysfs_fini(struct module
*mod
)
1368 #endif /* CONFIG_SYSFS */
1370 static void mod_kobject_remove(struct module
*mod
)
1372 module_remove_modinfo_attrs(mod
);
1373 module_param_sysfs_remove(mod
);
1374 kobject_put(mod
->mkobj
.drivers_dir
);
1375 kobject_put(mod
->holders_dir
);
1376 mod_sysfs_fini(mod
);
1380 * unlink the module with the whole machine is stopped with interrupts off
1381 * - this defends against kallsyms not taking locks
1383 static int __unlink_module(void *_mod
)
1385 struct module
*mod
= _mod
;
1386 list_del(&mod
->list
);
1390 /* Free a module, remove from lists, etc (must hold module_mutex). */
1391 static void free_module(struct module
*mod
)
1393 trace_module_free(mod
);
1395 /* Delete from various lists */
1396 stop_machine(__unlink_module
, mod
, NULL
);
1397 remove_notes_attrs(mod
);
1398 remove_sect_attrs(mod
);
1399 mod_kobject_remove(mod
);
1401 /* Arch-specific cleanup. */
1402 module_arch_cleanup(mod
);
1404 /* Module unload stuff */
1405 module_unload_free(mod
);
1407 /* Free any allocated parameters. */
1408 destroy_params(mod
->kp
, mod
->num_kp
);
1410 /* This may be NULL, but that's OK */
1411 module_free(mod
, mod
->module_init
);
1413 percpu_modfree(mod
);
1414 #if defined(CONFIG_MODULE_UNLOAD)
1416 free_percpu(mod
->refptr
);
1418 /* Free lock-classes: */
1419 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1421 /* Finally, free the core (containing the module structure) */
1422 module_free(mod
, mod
->module_core
);
1425 update_protections(current
->mm
);
1429 void *__symbol_get(const char *symbol
)
1431 struct module
*owner
;
1432 const struct kernel_symbol
*sym
;
1435 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1436 if (sym
&& strong_try_module_get(owner
))
1440 return sym
? (void *)sym
->value
: NULL
;
1442 EXPORT_SYMBOL_GPL(__symbol_get
);
1445 * Ensure that an exported symbol [global namespace] does not already exist
1446 * in the kernel or in some other module's exported symbol table.
1448 static int verify_export_symbols(struct module
*mod
)
1451 struct module
*owner
;
1452 const struct kernel_symbol
*s
;
1454 const struct kernel_symbol
*sym
;
1457 { mod
->syms
, mod
->num_syms
},
1458 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1459 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1460 #ifdef CONFIG_UNUSED_SYMBOLS
1461 { mod
->unused_syms
, mod
->num_unused_syms
},
1462 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1466 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1467 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1468 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1470 "%s: exports duplicate symbol %s"
1472 mod
->name
, s
->name
, module_name(owner
));
1480 /* Change all symbols so that st_value encodes the pointer directly. */
1481 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1482 unsigned int symindex
,
1484 unsigned int versindex
,
1485 unsigned int pcpuindex
,
1488 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1489 unsigned long secbase
;
1490 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1492 const struct kernel_symbol
*ksym
;
1494 for (i
= 1; i
< n
; i
++) {
1495 switch (sym
[i
].st_shndx
) {
1497 /* We compiled with -fno-common. These are not
1498 supposed to happen. */
1499 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1500 printk("%s: please compile with -fno-common\n",
1506 /* Don't need to do anything */
1507 DEBUGP("Absolute symbol: 0x%08lx\n",
1508 (long)sym
[i
].st_value
);
1512 ksym
= resolve_symbol(sechdrs
, versindex
,
1513 strtab
+ sym
[i
].st_name
, mod
);
1514 /* Ok if resolved. */
1516 sym
[i
].st_value
= ksym
->value
;
1521 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1524 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1525 mod
->name
, strtab
+ sym
[i
].st_name
);
1530 /* Divert to percpu allocation if a percpu var. */
1531 if (sym
[i
].st_shndx
== pcpuindex
)
1532 secbase
= (unsigned long)mod_percpu(mod
);
1534 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1535 sym
[i
].st_value
+= secbase
;
1543 /* Additional bytes needed by arch in front of individual sections */
1544 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1545 unsigned int section
)
1547 /* default implementation just returns zero */
1551 /* Update size with this section: return offset. */
1552 static long get_offset(struct module
*mod
, unsigned int *size
,
1553 Elf_Shdr
*sechdr
, unsigned int section
)
1557 *size
+= arch_mod_section_prepend(mod
, section
);
1558 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1559 *size
= ret
+ sechdr
->sh_size
;
1563 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1564 might -- code, read-only data, read-write data, small data. Tally
1565 sizes, and place the offsets into sh_entsize fields: high bit means it
1567 static void layout_sections(struct module
*mod
,
1568 const Elf_Ehdr
*hdr
,
1570 const char *secstrings
)
1572 static unsigned long const masks
[][2] = {
1573 /* NOTE: all executable code must be the first section
1574 * in this array; otherwise modify the text_size
1575 * finder in the two loops below */
1576 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1577 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1578 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1579 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1583 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1584 sechdrs
[i
].sh_entsize
= ~0UL;
1586 DEBUGP("Core section allocation order:\n");
1587 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1588 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1589 Elf_Shdr
*s
= &sechdrs
[i
];
1591 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1592 || (s
->sh_flags
& masks
[m
][1])
1593 || s
->sh_entsize
!= ~0UL
1594 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1596 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1597 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1600 mod
->core_text_size
= mod
->core_size
;
1603 DEBUGP("Init section allocation order:\n");
1604 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1605 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1606 Elf_Shdr
*s
= &sechdrs
[i
];
1608 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1609 || (s
->sh_flags
& masks
[m
][1])
1610 || s
->sh_entsize
!= ~0UL
1611 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1613 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1614 | INIT_OFFSET_MASK
);
1615 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1618 mod
->init_text_size
= mod
->init_size
;
1622 static void set_license(struct module
*mod
, const char *license
)
1625 license
= "unspecified";
1627 if (!license_is_gpl_compatible(license
)) {
1628 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1629 printk(KERN_WARNING
"%s: module license '%s' taints "
1630 "kernel.\n", mod
->name
, license
);
1631 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1635 /* Parse tag=value strings from .modinfo section */
1636 static char *next_string(char *string
, unsigned long *secsize
)
1638 /* Skip non-zero chars */
1641 if ((*secsize
)-- <= 1)
1645 /* Skip any zero padding. */
1646 while (!string
[0]) {
1648 if ((*secsize
)-- <= 1)
1654 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1659 unsigned int taglen
= strlen(tag
);
1660 unsigned long size
= sechdrs
[info
].sh_size
;
1662 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1663 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1664 return p
+ taglen
+ 1;
1669 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1670 unsigned int infoindex
)
1672 struct module_attribute
*attr
;
1675 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1678 get_modinfo(sechdrs
,
1684 static void free_modinfo(struct module
*mod
)
1686 struct module_attribute
*attr
;
1689 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1695 #ifdef CONFIG_KALLSYMS
1697 /* lookup symbol in given range of kernel_symbols */
1698 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1699 const struct kernel_symbol
*start
,
1700 const struct kernel_symbol
*stop
)
1702 const struct kernel_symbol
*ks
= start
;
1703 for (; ks
< stop
; ks
++)
1704 if (strcmp(ks
->name
, name
) == 0)
1709 static int is_exported(const char *name
, unsigned long value
,
1710 const struct module
*mod
)
1712 const struct kernel_symbol
*ks
;
1714 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1716 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1717 return ks
!= NULL
&& ks
->value
== value
;
1721 static char elf_type(const Elf_Sym
*sym
,
1723 const char *secstrings
,
1726 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1727 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1732 if (sym
->st_shndx
== SHN_UNDEF
)
1734 if (sym
->st_shndx
== SHN_ABS
)
1736 if (sym
->st_shndx
>= SHN_LORESERVE
)
1738 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1740 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1741 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1742 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1744 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1749 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1750 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1755 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1760 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
1763 const Elf_Shdr
*sec
;
1765 if (src
->st_shndx
== SHN_UNDEF
1766 || src
->st_shndx
>= shnum
1770 sec
= sechdrs
+ src
->st_shndx
;
1771 if (!(sec
->sh_flags
& SHF_ALLOC
)
1772 #ifndef CONFIG_KALLSYMS_ALL
1773 || !(sec
->sh_flags
& SHF_EXECINSTR
)
1775 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
1781 static unsigned long layout_symtab(struct module
*mod
,
1783 unsigned int symindex
,
1784 unsigned int strindex
,
1785 const Elf_Ehdr
*hdr
,
1786 const char *secstrings
,
1787 unsigned long *pstroffs
,
1788 unsigned long *strmap
)
1790 unsigned long symoffs
;
1791 Elf_Shdr
*symsect
= sechdrs
+ symindex
;
1792 Elf_Shdr
*strsect
= sechdrs
+ strindex
;
1795 unsigned int i
, nsrc
, ndst
;
1797 /* Put symbol section at end of init part of module. */
1798 symsect
->sh_flags
|= SHF_ALLOC
;
1799 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
1800 symindex
) | INIT_OFFSET_MASK
;
1801 DEBUGP("\t%s\n", secstrings
+ symsect
->sh_name
);
1803 src
= (void *)hdr
+ symsect
->sh_offset
;
1804 nsrc
= symsect
->sh_size
/ sizeof(*src
);
1805 strtab
= (void *)hdr
+ strsect
->sh_offset
;
1806 for (ndst
= i
= 1; i
< nsrc
; ++i
, ++src
)
1807 if (is_core_symbol(src
, sechdrs
, hdr
->e_shnum
)) {
1808 unsigned int j
= src
->st_name
;
1810 while(!__test_and_set_bit(j
, strmap
) && strtab
[j
])
1815 /* Append room for core symbols at end of core part. */
1816 symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
1817 mod
->core_size
= symoffs
+ ndst
* sizeof(Elf_Sym
);
1819 /* Put string table section at end of init part of module. */
1820 strsect
->sh_flags
|= SHF_ALLOC
;
1821 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
1822 strindex
) | INIT_OFFSET_MASK
;
1823 DEBUGP("\t%s\n", secstrings
+ strsect
->sh_name
);
1825 /* Append room for core symbols' strings at end of core part. */
1826 *pstroffs
= mod
->core_size
;
1827 __set_bit(0, strmap
);
1828 mod
->core_size
+= bitmap_weight(strmap
, strsect
->sh_size
);
1833 static void add_kallsyms(struct module
*mod
,
1836 unsigned int symindex
,
1837 unsigned int strindex
,
1838 unsigned long symoffs
,
1839 unsigned long stroffs
,
1840 const char *secstrings
,
1841 unsigned long *strmap
)
1843 unsigned int i
, ndst
;
1848 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1849 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1850 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1852 /* Set types up while we still have access to sections. */
1853 for (i
= 0; i
< mod
->num_symtab
; i
++)
1854 mod
->symtab
[i
].st_info
1855 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1857 mod
->core_symtab
= dst
= mod
->module_core
+ symoffs
;
1860 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
1861 if (!is_core_symbol(src
, sechdrs
, shnum
))
1864 dst
[ndst
].st_name
= bitmap_weight(strmap
, dst
[ndst
].st_name
);
1867 mod
->core_num_syms
= ndst
;
1869 mod
->core_strtab
= s
= mod
->module_core
+ stroffs
;
1870 for (*s
= 0, i
= 1; i
< sechdrs
[strindex
].sh_size
; ++i
)
1871 if (test_bit(i
, strmap
))
1872 *++s
= mod
->strtab
[i
];
1875 static inline unsigned long layout_symtab(struct module
*mod
,
1877 unsigned int symindex
,
1878 unsigned int strindex
,
1879 const Elf_Ehdr
*hdr
,
1880 const char *secstrings
,
1881 unsigned long *pstroffs
,
1882 unsigned long *strmap
)
1887 static inline void add_kallsyms(struct module
*mod
,
1890 unsigned int symindex
,
1891 unsigned int strindex
,
1892 unsigned long symoffs
,
1893 unsigned long stroffs
,
1894 const char *secstrings
,
1895 const unsigned long *strmap
)
1898 #endif /* CONFIG_KALLSYMS */
1900 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
1902 #ifdef CONFIG_DYNAMIC_DEBUG
1903 if (ddebug_add_module(debug
, num
, debug
->modname
))
1904 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
1909 static void *module_alloc_update_bounds(unsigned long size
)
1911 void *ret
= module_alloc(size
);
1914 /* Update module bounds. */
1915 if ((unsigned long)ret
< module_addr_min
)
1916 module_addr_min
= (unsigned long)ret
;
1917 if ((unsigned long)ret
+ size
> module_addr_max
)
1918 module_addr_max
= (unsigned long)ret
+ size
;
1923 #ifdef CONFIG_DEBUG_KMEMLEAK
1924 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1925 Elf_Shdr
*sechdrs
, char *secstrings
)
1929 /* only scan the sections containing data */
1930 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
1932 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1933 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1935 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
1936 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
1939 kmemleak_scan_area((void *)sechdrs
[i
].sh_addr
,
1940 sechdrs
[i
].sh_size
, GFP_KERNEL
);
1944 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
1945 Elf_Shdr
*sechdrs
, char *secstrings
)
1950 /* Allocate and load the module: note that size of section 0 is always
1951 zero, and we rely on this for optional sections. */
1952 static noinline
struct module
*load_module(void __user
*umod
,
1954 const char __user
*uargs
)
1958 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1961 unsigned int symindex
= 0;
1962 unsigned int strindex
= 0;
1963 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
1966 void *ptr
= NULL
; /* Stops spurious gcc warning */
1967 unsigned long symoffs
, stroffs
, *strmap
;
1969 mm_segment_t old_fs
;
1971 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1973 if (len
< sizeof(*hdr
))
1974 return ERR_PTR(-ENOEXEC
);
1976 /* Suck in entire file: we'll want most of it. */
1977 /* vmalloc barfs on "unusual" numbers. Check here */
1978 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1979 return ERR_PTR(-ENOMEM
);
1981 if (copy_from_user(hdr
, umod
, len
) != 0) {
1986 /* Sanity checks against insmoding binaries or wrong arch,
1987 weird elf version */
1988 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
1989 || hdr
->e_type
!= ET_REL
1990 || !elf_check_arch(hdr
)
1991 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1996 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1999 /* Convenience variables */
2000 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
2001 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
2002 sechdrs
[0].sh_addr
= 0;
2004 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2005 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
2006 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
2009 /* Mark all sections sh_addr with their address in the
2011 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
2013 /* Internal symbols and strings. */
2014 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2016 strindex
= sechdrs
[i
].sh_link
;
2017 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
2019 #ifndef CONFIG_MODULE_UNLOAD
2020 /* Don't load .exit sections */
2021 if (strstarts(secstrings
+sechdrs
[i
].sh_name
, ".exit"))
2022 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2026 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
2027 ".gnu.linkonce.this_module");
2029 printk(KERN_WARNING
"No module found in object\n");
2033 /* This is temporary: point mod into copy of data. */
2034 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2036 if (symindex
== 0) {
2037 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2043 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
2044 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
2045 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
2047 /* Don't keep modinfo and version sections. */
2048 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2049 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2051 /* Check module struct version now, before we try to use module. */
2052 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
2057 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2058 /* This is allowed: modprobe --force will invalidate it. */
2060 err
= try_to_force_load(mod
, "bad vermagic");
2063 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2064 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2065 mod
->name
, modmagic
, vermagic
);
2070 staging
= get_modinfo(sechdrs
, infoindex
, "staging");
2072 add_taint_module(mod
, TAINT_CRAP
);
2073 printk(KERN_WARNING
"%s: module is from the staging directory,"
2074 " the quality is unknown, you have been warned.\n",
2078 /* Now copy in args */
2079 args
= strndup_user(uargs
, ~0UL >> 1);
2081 err
= PTR_ERR(args
);
2085 strmap
= kzalloc(BITS_TO_LONGS(sechdrs
[strindex
].sh_size
)
2086 * sizeof(long), GFP_KERNEL
);
2092 if (find_module(mod
->name
)) {
2097 mod
->state
= MODULE_STATE_COMING
;
2099 /* Allow arches to frob section contents and sizes. */
2100 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2105 /* We have a special allocation for this section. */
2106 err
= percpu_modalloc(mod
, sechdrs
[pcpuindex
].sh_size
,
2107 sechdrs
[pcpuindex
].sh_addralign
);
2110 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2113 /* Determine total sizes, and put offsets in sh_entsize. For now
2114 this is done generically; there doesn't appear to be any
2115 special cases for the architectures. */
2116 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2117 symoffs
= layout_symtab(mod
, sechdrs
, symindex
, strindex
, hdr
,
2118 secstrings
, &stroffs
, strmap
);
2120 /* Do the allocs. */
2121 ptr
= module_alloc_update_bounds(mod
->core_size
);
2123 * The pointer to this block is stored in the module structure
2124 * which is inside the block. Just mark it as not being a
2127 kmemleak_not_leak(ptr
);
2132 memset(ptr
, 0, mod
->core_size
);
2133 mod
->module_core
= ptr
;
2135 ptr
= module_alloc_update_bounds(mod
->init_size
);
2137 * The pointer to this block is stored in the module structure
2138 * which is inside the block. This block doesn't need to be
2139 * scanned as it contains data and code that will be freed
2140 * after the module is initialized.
2142 kmemleak_ignore(ptr
);
2143 if (!ptr
&& mod
->init_size
) {
2147 memset(ptr
, 0, mod
->init_size
);
2148 mod
->module_init
= ptr
;
2150 /* Transfer each section which specifies SHF_ALLOC */
2151 DEBUGP("final section addresses:\n");
2152 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2155 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2158 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2159 dest
= mod
->module_init
2160 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2162 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2164 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2165 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2166 sechdrs
[i
].sh_size
);
2167 /* Update sh_addr to point to copy in image. */
2168 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2169 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2171 /* Module has been moved. */
2172 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2173 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2175 #if defined(CONFIG_MODULE_UNLOAD)
2176 mod
->refptr
= alloc_percpu(struct module_ref
);
2182 /* Now we've moved module, initialize linked lists, etc. */
2183 module_unload_init(mod
);
2185 /* add kobject, so we can reference it. */
2186 err
= mod_sysfs_init(mod
);
2190 /* Set up license info based on the info section */
2191 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2194 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2195 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2196 * using GPL-only symbols it needs.
2198 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2199 add_taint(TAINT_PROPRIETARY_MODULE
);
2201 /* driverloader was caught wrongly pretending to be under GPL */
2202 if (strcmp(mod
->name
, "driverloader") == 0)
2203 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2205 /* Set up MODINFO_ATTR fields */
2206 setup_modinfo(mod
, sechdrs
, infoindex
);
2208 /* Fix up syms, so that st_value is a pointer to location. */
2209 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2214 /* Now we've got everything in the final locations, we can
2215 * find optional sections. */
2216 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2217 sizeof(*mod
->kp
), &mod
->num_kp
);
2218 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2219 sizeof(*mod
->syms
), &mod
->num_syms
);
2220 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2221 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2222 sizeof(*mod
->gpl_syms
),
2223 &mod
->num_gpl_syms
);
2224 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2225 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2226 "__ksymtab_gpl_future",
2227 sizeof(*mod
->gpl_future_syms
),
2228 &mod
->num_gpl_future_syms
);
2229 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2230 "__kcrctab_gpl_future");
2232 #ifdef CONFIG_UNUSED_SYMBOLS
2233 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2235 sizeof(*mod
->unused_syms
),
2236 &mod
->num_unused_syms
);
2237 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2238 "__kcrctab_unused");
2239 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2240 "__ksymtab_unused_gpl",
2241 sizeof(*mod
->unused_gpl_syms
),
2242 &mod
->num_unused_gpl_syms
);
2243 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2244 "__kcrctab_unused_gpl");
2246 #ifdef CONFIG_CONSTRUCTORS
2247 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2248 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2251 #ifdef CONFIG_TRACEPOINTS
2252 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2254 sizeof(*mod
->tracepoints
),
2255 &mod
->num_tracepoints
);
2257 #ifdef CONFIG_EVENT_TRACING
2258 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2260 sizeof(*mod
->trace_events
),
2261 &mod
->num_trace_events
);
2263 * This section contains pointers to allocated objects in the trace
2264 * code and not scanning it leads to false positives.
2266 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2267 mod
->num_trace_events
, GFP_KERNEL
);
2269 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2270 /* sechdrs[0].sh_size is always zero */
2271 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2273 sizeof(*mod
->ftrace_callsites
),
2274 &mod
->num_ftrace_callsites
);
2276 #ifdef CONFIG_MODVERSIONS
2277 if ((mod
->num_syms
&& !mod
->crcs
)
2278 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2279 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2280 #ifdef CONFIG_UNUSED_SYMBOLS
2281 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2282 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2285 err
= try_to_force_load(mod
,
2286 "no versions for exported symbols");
2292 /* Now do relocations. */
2293 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2294 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2295 unsigned int info
= sechdrs
[i
].sh_info
;
2297 /* Not a valid relocation section? */
2298 if (info
>= hdr
->e_shnum
)
2301 /* Don't bother with non-allocated sections */
2302 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2305 if (sechdrs
[i
].sh_type
== SHT_REL
)
2306 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2307 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2308 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2314 /* Find duplicate symbols */
2315 err
= verify_export_symbols(mod
);
2319 /* Set up and sort exception table */
2320 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2321 sizeof(*mod
->extable
), &mod
->num_exentries
);
2322 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2324 /* Finally, copy percpu area over. */
2325 percpu_modcopy(mod
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2326 sechdrs
[pcpuindex
].sh_size
);
2328 add_kallsyms(mod
, sechdrs
, hdr
->e_shnum
, symindex
, strindex
,
2329 symoffs
, stroffs
, secstrings
, strmap
);
2334 struct _ddebug
*debug
;
2335 unsigned int num_debug
;
2337 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2338 sizeof(*debug
), &num_debug
);
2340 dynamic_debug_setup(debug
, num_debug
);
2343 err
= module_finalize(hdr
, sechdrs
, mod
);
2347 /* flush the icache in correct context */
2352 * Flush the instruction cache, since we've played with text.
2353 * Do it before processing of module parameters, so the module
2354 * can provide parameter accessor functions of its own.
2356 if (mod
->module_init
)
2357 flush_icache_range((unsigned long)mod
->module_init
,
2358 (unsigned long)mod
->module_init
2360 flush_icache_range((unsigned long)mod
->module_core
,
2361 (unsigned long)mod
->module_core
+ mod
->core_size
);
2366 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2367 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2370 /* Now sew it into the lists so we can get lockdep and oops
2371 * info during argument parsing. Noone should access us, since
2372 * strong_try_module_get() will fail.
2373 * lockdep/oops can run asynchronous, so use the RCU list insertion
2374 * function to insert in a way safe to concurrent readers.
2375 * The mutex protects against concurrent writers.
2377 list_add_rcu(&mod
->list
, &modules
);
2379 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2383 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2386 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2387 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2389 /* Get rid of temporary copy */
2392 trace_module_load(mod
);
2398 /* Unlink carefully: kallsyms could be walking list. */
2399 list_del_rcu(&mod
->list
);
2400 synchronize_sched();
2401 module_arch_cleanup(mod
);
2404 kobject_del(&mod
->mkobj
.kobj
);
2405 kobject_put(&mod
->mkobj
.kobj
);
2407 module_unload_free(mod
);
2408 #if defined(CONFIG_MODULE_UNLOAD)
2409 free_percpu(mod
->refptr
);
2412 module_free(mod
, mod
->module_init
);
2414 module_free(mod
, mod
->module_core
);
2415 /* mod will be freed with core. Don't access it beyond this line! */
2417 percpu_modfree(mod
);
2423 return ERR_PTR(err
);
2426 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2431 /* Call module constructors. */
2432 static void do_mod_ctors(struct module
*mod
)
2434 #ifdef CONFIG_CONSTRUCTORS
2437 for (i
= 0; i
< mod
->num_ctors
; i
++)
2442 /* This is where the real work happens */
2443 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2444 unsigned long, len
, const char __user
*, uargs
)
2449 /* Must have permission */
2450 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2453 /* Only one module load at a time, please */
2454 if (mutex_lock_interruptible(&module_mutex
) != 0)
2457 /* Do all the hard work */
2458 mod
= load_module(umod
, len
, uargs
);
2460 mutex_unlock(&module_mutex
);
2461 return PTR_ERR(mod
);
2464 /* Drop lock so they can recurse */
2465 mutex_unlock(&module_mutex
);
2467 blocking_notifier_call_chain(&module_notify_list
,
2468 MODULE_STATE_COMING
, mod
);
2471 /* Start the module */
2472 if (mod
->init
!= NULL
)
2473 ret
= do_one_initcall(mod
->init
);
2475 /* Init routine failed: abort. Try to protect us from
2476 buggy refcounters. */
2477 mod
->state
= MODULE_STATE_GOING
;
2478 synchronize_sched();
2480 blocking_notifier_call_chain(&module_notify_list
,
2481 MODULE_STATE_GOING
, mod
);
2482 mutex_lock(&module_mutex
);
2484 mutex_unlock(&module_mutex
);
2485 wake_up(&module_wq
);
2490 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2491 "%s: loading module anyway...\n",
2492 __func__
, mod
->name
, ret
,
2497 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2498 mod
->state
= MODULE_STATE_LIVE
;
2499 wake_up(&module_wq
);
2500 blocking_notifier_call_chain(&module_notify_list
,
2501 MODULE_STATE_LIVE
, mod
);
2503 /* We need to finish all async code before the module init sequence is done */
2504 async_synchronize_full();
2506 mutex_lock(&module_mutex
);
2507 /* Drop initial reference. */
2509 trim_init_extable(mod
);
2510 #ifdef CONFIG_KALLSYMS
2511 mod
->num_symtab
= mod
->core_num_syms
;
2512 mod
->symtab
= mod
->core_symtab
;
2513 mod
->strtab
= mod
->core_strtab
;
2515 module_free(mod
, mod
->module_init
);
2516 mod
->module_init
= NULL
;
2518 mod
->init_text_size
= 0;
2519 mutex_unlock(&module_mutex
);
2524 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2526 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2529 #ifdef CONFIG_KALLSYMS
2531 * This ignores the intensely annoying "mapping symbols" found
2532 * in ARM ELF files: $a, $t and $d.
2534 static inline int is_arm_mapping_symbol(const char *str
)
2536 return str
[0] == '$' && strchr("atd", str
[1])
2537 && (str
[2] == '\0' || str
[2] == '.');
2540 static const char *get_ksymbol(struct module
*mod
,
2542 unsigned long *size
,
2543 unsigned long *offset
)
2545 unsigned int i
, best
= 0;
2546 unsigned long nextval
;
2548 /* At worse, next value is at end of module */
2549 if (within_module_init(addr
, mod
))
2550 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2552 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2554 /* Scan for closest preceeding symbol, and next symbol. (ELF
2555 starts real symbols at 1). */
2556 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2557 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2560 /* We ignore unnamed symbols: they're uninformative
2561 * and inserted at a whim. */
2562 if (mod
->symtab
[i
].st_value
<= addr
2563 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2564 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2565 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2567 if (mod
->symtab
[i
].st_value
> addr
2568 && mod
->symtab
[i
].st_value
< nextval
2569 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2570 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2571 nextval
= mod
->symtab
[i
].st_value
;
2578 *size
= nextval
- mod
->symtab
[best
].st_value
;
2580 *offset
= addr
- mod
->symtab
[best
].st_value
;
2581 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2584 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2585 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2586 const char *module_address_lookup(unsigned long addr
,
2587 unsigned long *size
,
2588 unsigned long *offset
,
2593 const char *ret
= NULL
;
2596 list_for_each_entry_rcu(mod
, &modules
, list
) {
2597 if (within_module_init(addr
, mod
) ||
2598 within_module_core(addr
, mod
)) {
2600 *modname
= mod
->name
;
2601 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2605 /* Make a copy in here where it's safe */
2607 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2614 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2619 list_for_each_entry_rcu(mod
, &modules
, list
) {
2620 if (within_module_init(addr
, mod
) ||
2621 within_module_core(addr
, mod
)) {
2624 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2627 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2637 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2638 unsigned long *offset
, char *modname
, char *name
)
2643 list_for_each_entry_rcu(mod
, &modules
, list
) {
2644 if (within_module_init(addr
, mod
) ||
2645 within_module_core(addr
, mod
)) {
2648 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2652 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2654 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2664 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2665 char *name
, char *module_name
, int *exported
)
2670 list_for_each_entry_rcu(mod
, &modules
, list
) {
2671 if (symnum
< mod
->num_symtab
) {
2672 *value
= mod
->symtab
[symnum
].st_value
;
2673 *type
= mod
->symtab
[symnum
].st_info
;
2674 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2676 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2677 *exported
= is_exported(name
, *value
, mod
);
2681 symnum
-= mod
->num_symtab
;
2687 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2691 for (i
= 0; i
< mod
->num_symtab
; i
++)
2692 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2693 mod
->symtab
[i
].st_info
!= 'U')
2694 return mod
->symtab
[i
].st_value
;
2698 /* Look for this name: can be of form module:name. */
2699 unsigned long module_kallsyms_lookup_name(const char *name
)
2703 unsigned long ret
= 0;
2705 /* Don't lock: we're in enough trouble already. */
2707 if ((colon
= strchr(name
, ':')) != NULL
) {
2709 if ((mod
= find_module(name
)) != NULL
)
2710 ret
= mod_find_symname(mod
, colon
+1);
2713 list_for_each_entry_rcu(mod
, &modules
, list
)
2714 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2721 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2722 struct module
*, unsigned long),
2729 list_for_each_entry(mod
, &modules
, list
) {
2730 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2731 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2732 mod
, mod
->symtab
[i
].st_value
);
2739 #endif /* CONFIG_KALLSYMS */
2741 static char *module_flags(struct module
*mod
, char *buf
)
2746 mod
->state
== MODULE_STATE_GOING
||
2747 mod
->state
== MODULE_STATE_COMING
) {
2749 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2751 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2753 if (mod
->taints
& (1 << TAINT_CRAP
))
2756 * TAINT_FORCED_RMMOD: could be added.
2757 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2761 /* Show a - for module-is-being-unloaded */
2762 if (mod
->state
== MODULE_STATE_GOING
)
2764 /* Show a + for module-is-being-loaded */
2765 if (mod
->state
== MODULE_STATE_COMING
)
2774 #ifdef CONFIG_PROC_FS
2775 /* Called by the /proc file system to return a list of modules. */
2776 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2778 mutex_lock(&module_mutex
);
2779 return seq_list_start(&modules
, *pos
);
2782 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2784 return seq_list_next(p
, &modules
, pos
);
2787 static void m_stop(struct seq_file
*m
, void *p
)
2789 mutex_unlock(&module_mutex
);
2792 static int m_show(struct seq_file
*m
, void *p
)
2794 struct module
*mod
= list_entry(p
, struct module
, list
);
2797 seq_printf(m
, "%s %u",
2798 mod
->name
, mod
->init_size
+ mod
->core_size
);
2799 print_unload_info(m
, mod
);
2801 /* Informative for users. */
2802 seq_printf(m
, " %s",
2803 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2804 mod
->state
== MODULE_STATE_COMING
? "Loading":
2806 /* Used by oprofile and other similar tools. */
2807 seq_printf(m
, " 0x%p", mod
->module_core
);
2811 seq_printf(m
, " %s", module_flags(mod
, buf
));
2813 seq_printf(m
, "\n");
2817 /* Format: modulename size refcount deps address
2819 Where refcount is a number or -, and deps is a comma-separated list
2822 static const struct seq_operations modules_op
= {
2829 static int modules_open(struct inode
*inode
, struct file
*file
)
2831 return seq_open(file
, &modules_op
);
2834 static const struct file_operations proc_modules_operations
= {
2835 .open
= modules_open
,
2837 .llseek
= seq_lseek
,
2838 .release
= seq_release
,
2841 static int __init
proc_modules_init(void)
2843 proc_create("modules", 0, NULL
, &proc_modules_operations
);
2846 module_init(proc_modules_init
);
2849 /* Given an address, look for it in the module exception tables. */
2850 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2852 const struct exception_table_entry
*e
= NULL
;
2856 list_for_each_entry_rcu(mod
, &modules
, list
) {
2857 if (mod
->num_exentries
== 0)
2860 e
= search_extable(mod
->extable
,
2861 mod
->extable
+ mod
->num_exentries
- 1,
2868 /* Now, if we found one, we are running inside it now, hence
2869 we cannot unload the module, hence no refcnt needed. */
2874 * is_module_address - is this address inside a module?
2875 * @addr: the address to check.
2877 * See is_module_text_address() if you simply want to see if the address
2878 * is code (not data).
2880 bool is_module_address(unsigned long addr
)
2885 ret
= __module_address(addr
) != NULL
;
2892 * __module_address - get the module which contains an address.
2893 * @addr: the address.
2895 * Must be called with preempt disabled or module mutex held so that
2896 * module doesn't get freed during this.
2898 struct module
*__module_address(unsigned long addr
)
2902 if (addr
< module_addr_min
|| addr
> module_addr_max
)
2905 list_for_each_entry_rcu(mod
, &modules
, list
)
2906 if (within_module_core(addr
, mod
)
2907 || within_module_init(addr
, mod
))
2911 EXPORT_SYMBOL_GPL(__module_address
);
2914 * is_module_text_address - is this address inside module code?
2915 * @addr: the address to check.
2917 * See is_module_address() if you simply want to see if the address is
2918 * anywhere in a module. See kernel_text_address() for testing if an
2919 * address corresponds to kernel or module code.
2921 bool is_module_text_address(unsigned long addr
)
2926 ret
= __module_text_address(addr
) != NULL
;
2933 * __module_text_address - get the module whose code contains an address.
2934 * @addr: the address.
2936 * Must be called with preempt disabled or module mutex held so that
2937 * module doesn't get freed during this.
2939 struct module
*__module_text_address(unsigned long addr
)
2941 struct module
*mod
= __module_address(addr
);
2943 /* Make sure it's within the text section. */
2944 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
2945 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
2950 EXPORT_SYMBOL_GPL(__module_text_address
);
2952 /* Don't grab lock, we're oopsing. */
2953 void print_modules(void)
2958 printk(KERN_DEFAULT
"Modules linked in:");
2959 /* Most callers should already have preempt disabled, but make sure */
2961 list_for_each_entry_rcu(mod
, &modules
, list
)
2962 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2964 if (last_unloaded_module
[0])
2965 printk(" [last unloaded: %s]", last_unloaded_module
);
2969 #ifdef CONFIG_MODVERSIONS
2970 /* Generate the signature for all relevant module structures here.
2971 * If these change, we don't want to try to parse the module. */
2972 void module_layout(struct module
*mod
,
2973 struct modversion_info
*ver
,
2974 struct kernel_param
*kp
,
2975 struct kernel_symbol
*ks
,
2976 struct tracepoint
*tp
)
2979 EXPORT_SYMBOL(module_layout
);
2982 #ifdef CONFIG_TRACEPOINTS
2983 void module_update_tracepoints(void)
2987 mutex_lock(&module_mutex
);
2988 list_for_each_entry(mod
, &modules
, list
)
2990 tracepoint_update_probe_range(mod
->tracepoints
,
2991 mod
->tracepoints
+ mod
->num_tracepoints
);
2992 mutex_unlock(&module_mutex
);
2996 * Returns 0 if current not found.
2997 * Returns 1 if current found.
2999 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
3001 struct module
*iter_mod
;
3004 mutex_lock(&module_mutex
);
3005 list_for_each_entry(iter_mod
, &modules
, list
) {
3006 if (!iter_mod
->taints
) {
3008 * Sorted module list
3010 if (iter_mod
< iter
->module
)
3012 else if (iter_mod
> iter
->module
)
3013 iter
->tracepoint
= NULL
;
3014 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
3015 iter_mod
->tracepoints
,
3016 iter_mod
->tracepoints
3017 + iter_mod
->num_tracepoints
);
3019 iter
->module
= iter_mod
;
3024 mutex_unlock(&module_mutex
);