2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/module.h>
65 #define DEBUGP(fmt , a...)
68 #ifndef ARCH_SHF_SMALL
69 #define ARCH_SHF_SMALL 0
72 /* If this is set, the section belongs in the init part of the module */
73 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
77 * 1) List of modules (also safely readable with preempt_disable),
78 * 2) module_use links,
79 * 3) module_addr_min/module_addr_max.
80 * (delete uses stop_machine/add uses RCU list operations). */
81 DEFINE_MUTEX(module_mutex
);
82 EXPORT_SYMBOL_GPL(module_mutex
);
83 static LIST_HEAD(modules
);
84 #ifdef CONFIG_KGDB_KDB
85 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
86 #endif /* CONFIG_KGDB_KDB */
89 /* Block module loading/unloading? */
90 int modules_disabled
= 0;
92 /* Waiting for a module to finish initializing? */
93 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
95 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
97 /* Bounds of module allocation, for speeding __module_address.
98 * Protected by module_mutex. */
99 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
101 int register_module_notifier(struct notifier_block
* nb
)
103 return blocking_notifier_chain_register(&module_notify_list
, nb
);
105 EXPORT_SYMBOL(register_module_notifier
);
107 int unregister_module_notifier(struct notifier_block
* nb
)
109 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
111 EXPORT_SYMBOL(unregister_module_notifier
);
113 /* We require a truly strong try_module_get(): 0 means failure due to
114 ongoing or failed initialization etc. */
115 static inline int strong_try_module_get(struct module
*mod
)
117 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
119 if (try_module_get(mod
))
125 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
128 mod
->taints
|= (1U << flag
);
132 * A thread that wants to hold a reference to a module only while it
133 * is running can call this to safely exit. nfsd and lockd use this.
135 void __module_put_and_exit(struct module
*mod
, long code
)
140 EXPORT_SYMBOL(__module_put_and_exit
);
142 /* Find a module section: 0 means not found. */
143 static unsigned int find_sec(Elf_Ehdr
*hdr
,
145 const char *secstrings
,
150 for (i
= 1; i
< hdr
->e_shnum
; i
++)
151 /* Alloc bit cleared means "ignore it." */
152 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
153 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
158 /* Find a module section, or NULL. */
159 static void *section_addr(Elf_Ehdr
*hdr
, Elf_Shdr
*shdrs
,
160 const char *secstrings
, const char *name
)
162 /* Section 0 has sh_addr 0. */
163 return (void *)shdrs
[find_sec(hdr
, shdrs
, secstrings
, name
)].sh_addr
;
166 /* Find a module section, or NULL. Fill in number of "objects" in section. */
167 static void *section_objs(Elf_Ehdr
*hdr
,
169 const char *secstrings
,
174 unsigned int sec
= find_sec(hdr
, sechdrs
, secstrings
, name
);
176 /* Section 0 has sh_addr 0 and sh_size 0. */
177 *num
= sechdrs
[sec
].sh_size
/ object_size
;
178 return (void *)sechdrs
[sec
].sh_addr
;
181 /* Provided by the linker */
182 extern const struct kernel_symbol __start___ksymtab
[];
183 extern const struct kernel_symbol __stop___ksymtab
[];
184 extern const struct kernel_symbol __start___ksymtab_gpl
[];
185 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
186 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
187 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
188 extern const unsigned long __start___kcrctab
[];
189 extern const unsigned long __start___kcrctab_gpl
[];
190 extern const unsigned long __start___kcrctab_gpl_future
[];
191 #ifdef CONFIG_UNUSED_SYMBOLS
192 extern const struct kernel_symbol __start___ksymtab_unused
[];
193 extern const struct kernel_symbol __stop___ksymtab_unused
[];
194 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
195 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
196 extern const unsigned long __start___kcrctab_unused
[];
197 extern const unsigned long __start___kcrctab_unused_gpl
[];
200 #ifndef CONFIG_MODVERSIONS
201 #define symversion(base, idx) NULL
203 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
206 static bool each_symbol_in_section(const struct symsearch
*arr
,
207 unsigned int arrsize
,
208 struct module
*owner
,
209 bool (*fn
)(const struct symsearch
*syms
,
210 struct module
*owner
,
211 unsigned int symnum
, void *data
),
216 for (j
= 0; j
< arrsize
; j
++) {
217 for (i
= 0; i
< arr
[j
].stop
- arr
[j
].start
; i
++)
218 if (fn(&arr
[j
], owner
, i
, data
))
225 /* Returns true as soon as fn returns true, otherwise false. */
226 bool each_symbol(bool (*fn
)(const struct symsearch
*arr
, struct module
*owner
,
227 unsigned int symnum
, void *data
), void *data
)
230 const struct symsearch arr
[] = {
231 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
232 NOT_GPL_ONLY
, false },
233 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
234 __start___kcrctab_gpl
,
236 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
237 __start___kcrctab_gpl_future
,
238 WILL_BE_GPL_ONLY
, false },
239 #ifdef CONFIG_UNUSED_SYMBOLS
240 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
241 __start___kcrctab_unused
,
242 NOT_GPL_ONLY
, true },
243 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
244 __start___kcrctab_unused_gpl
,
249 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
252 list_for_each_entry_rcu(mod
, &modules
, list
) {
253 struct symsearch arr
[] = {
254 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
255 NOT_GPL_ONLY
, false },
256 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
259 { mod
->gpl_future_syms
,
260 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
261 mod
->gpl_future_crcs
,
262 WILL_BE_GPL_ONLY
, false },
263 #ifdef CONFIG_UNUSED_SYMBOLS
265 mod
->unused_syms
+ mod
->num_unused_syms
,
267 NOT_GPL_ONLY
, true },
268 { mod
->unused_gpl_syms
,
269 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
270 mod
->unused_gpl_crcs
,
275 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
280 EXPORT_SYMBOL_GPL(each_symbol
);
282 struct find_symbol_arg
{
289 struct module
*owner
;
290 const unsigned long *crc
;
291 const struct kernel_symbol
*sym
;
294 static bool find_symbol_in_section(const struct symsearch
*syms
,
295 struct module
*owner
,
296 unsigned int symnum
, void *data
)
298 struct find_symbol_arg
*fsa
= data
;
300 if (strcmp(syms
->start
[symnum
].name
, fsa
->name
) != 0)
304 if (syms
->licence
== GPL_ONLY
)
306 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
307 printk(KERN_WARNING
"Symbol %s is being used "
308 "by a non-GPL module, which will not "
309 "be allowed in the future\n", fsa
->name
);
310 printk(KERN_WARNING
"Please see the file "
311 "Documentation/feature-removal-schedule.txt "
312 "in the kernel source tree for more details.\n");
316 #ifdef CONFIG_UNUSED_SYMBOLS
317 if (syms
->unused
&& fsa
->warn
) {
318 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
319 "however this module is using it.\n", fsa
->name
);
321 "This symbol will go away in the future.\n");
323 "Please evalute if this is the right api to use and if "
324 "it really is, submit a report the linux kernel "
325 "mailinglist together with submitting your code for "
331 fsa
->crc
= symversion(syms
->crcs
, symnum
);
332 fsa
->sym
= &syms
->start
[symnum
];
336 /* Find a symbol and return it, along with, (optional) crc and
337 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
338 const struct kernel_symbol
*find_symbol(const char *name
,
339 struct module
**owner
,
340 const unsigned long **crc
,
344 struct find_symbol_arg fsa
;
350 if (each_symbol(find_symbol_in_section
, &fsa
)) {
358 DEBUGP("Failed to find symbol %s\n", name
);
361 EXPORT_SYMBOL_GPL(find_symbol
);
363 /* Search for module by name: must hold module_mutex. */
364 struct module
*find_module(const char *name
)
368 list_for_each_entry(mod
, &modules
, list
) {
369 if (strcmp(mod
->name
, name
) == 0)
374 EXPORT_SYMBOL_GPL(find_module
);
378 static inline void __percpu
*mod_percpu(struct module
*mod
)
383 static int percpu_modalloc(struct module
*mod
,
384 unsigned long size
, unsigned long align
)
386 if (align
> PAGE_SIZE
) {
387 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
388 mod
->name
, align
, PAGE_SIZE
);
392 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
395 "Could not allocate %lu bytes percpu data\n", size
);
398 mod
->percpu_size
= size
;
402 static void percpu_modfree(struct module
*mod
)
404 free_percpu(mod
->percpu
);
407 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
409 const char *secstrings
)
411 return find_sec(hdr
, sechdrs
, secstrings
, ".data..percpu");
414 static void percpu_modcopy(struct module
*mod
,
415 const void *from
, unsigned long size
)
419 for_each_possible_cpu(cpu
)
420 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
424 * is_module_percpu_address - test whether address is from module static percpu
425 * @addr: address to test
427 * Test whether @addr belongs to module static percpu area.
430 * %true if @addr is from module static percpu area
432 bool is_module_percpu_address(unsigned long addr
)
439 list_for_each_entry_rcu(mod
, &modules
, list
) {
440 if (!mod
->percpu_size
)
442 for_each_possible_cpu(cpu
) {
443 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
445 if ((void *)addr
>= start
&&
446 (void *)addr
< start
+ mod
->percpu_size
) {
457 #else /* ... !CONFIG_SMP */
459 static inline void __percpu
*mod_percpu(struct module
*mod
)
463 static inline int percpu_modalloc(struct module
*mod
,
464 unsigned long size
, unsigned long align
)
468 static inline void percpu_modfree(struct module
*mod
)
471 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
473 const char *secstrings
)
477 static inline void percpu_modcopy(struct module
*mod
,
478 const void *from
, unsigned long size
)
480 /* pcpusec should be 0, and size of that section should be 0. */
483 bool is_module_percpu_address(unsigned long addr
)
488 #endif /* CONFIG_SMP */
490 #define MODINFO_ATTR(field) \
491 static void setup_modinfo_##field(struct module *mod, const char *s) \
493 mod->field = kstrdup(s, GFP_KERNEL); \
495 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
496 struct module *mod, char *buffer) \
498 return sprintf(buffer, "%s\n", mod->field); \
500 static int modinfo_##field##_exists(struct module *mod) \
502 return mod->field != NULL; \
504 static void free_modinfo_##field(struct module *mod) \
509 static struct module_attribute modinfo_##field = { \
510 .attr = { .name = __stringify(field), .mode = 0444 }, \
511 .show = show_modinfo_##field, \
512 .setup = setup_modinfo_##field, \
513 .test = modinfo_##field##_exists, \
514 .free = free_modinfo_##field, \
517 MODINFO_ATTR(version
);
518 MODINFO_ATTR(srcversion
);
520 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
522 #ifdef CONFIG_MODULE_UNLOAD
524 EXPORT_TRACEPOINT_SYMBOL(module_get
);
526 /* Init the unload section of the module. */
527 static void module_unload_init(struct module
*mod
)
531 INIT_LIST_HEAD(&mod
->source_list
);
532 INIT_LIST_HEAD(&mod
->target_list
);
533 for_each_possible_cpu(cpu
) {
534 per_cpu_ptr(mod
->refptr
, cpu
)->incs
= 0;
535 per_cpu_ptr(mod
->refptr
, cpu
)->decs
= 0;
538 /* Hold reference count during initialization. */
539 __this_cpu_write(mod
->refptr
->incs
, 1);
540 /* Backwards compatibility macros put refcount during init. */
541 mod
->waiter
= current
;
544 /* Does a already use b? */
545 static int already_uses(struct module
*a
, struct module
*b
)
547 struct module_use
*use
;
549 list_for_each_entry(use
, &b
->source_list
, source_list
) {
550 if (use
->source
== a
) {
551 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
555 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
561 * - we add 'a' as a "source", 'b' as a "target" of module use
562 * - the module_use is added to the list of 'b' sources (so
563 * 'b' can walk the list to see who sourced them), and of 'a'
564 * targets (so 'a' can see what modules it targets).
566 static int add_module_usage(struct module
*a
, struct module
*b
)
568 struct module_use
*use
;
570 DEBUGP("Allocating new usage for %s.\n", a
->name
);
571 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
573 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
579 list_add(&use
->source_list
, &b
->source_list
);
580 list_add(&use
->target_list
, &a
->target_list
);
584 /* Module a uses b: caller needs module_mutex() */
585 int use_module(struct module
*a
, struct module
*b
)
589 if (b
== NULL
|| already_uses(a
, b
)) return 1;
591 /* If we're interrupted or time out, we fail. */
592 if (wait_event_interruptible_timeout(
593 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
595 printk("%s: gave up waiting for init of module %s.\n",
600 /* If strong_try_module_get() returned a different error, we fail. */
604 err
= add_module_usage(a
, b
);
611 EXPORT_SYMBOL_GPL(use_module
);
613 /* Clear the unload stuff of the module. */
614 static void module_unload_free(struct module
*mod
)
616 struct module_use
*use
, *tmp
;
618 mutex_lock(&module_mutex
);
619 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
620 struct module
*i
= use
->target
;
621 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
623 list_del(&use
->source_list
);
624 list_del(&use
->target_list
);
627 mutex_unlock(&module_mutex
);
630 #ifdef CONFIG_MODULE_FORCE_UNLOAD
631 static inline int try_force_unload(unsigned int flags
)
633 int ret
= (flags
& O_TRUNC
);
635 add_taint(TAINT_FORCED_RMMOD
);
639 static inline int try_force_unload(unsigned int flags
)
643 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
652 /* Whole machine is stopped with interrupts off when this runs. */
653 static int __try_stop_module(void *_sref
)
655 struct stopref
*sref
= _sref
;
657 /* If it's not unused, quit unless we're forcing. */
658 if (module_refcount(sref
->mod
) != 0) {
659 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
663 /* Mark it as dying. */
664 sref
->mod
->state
= MODULE_STATE_GOING
;
668 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
670 if (flags
& O_NONBLOCK
) {
671 struct stopref sref
= { mod
, flags
, forced
};
673 return stop_machine(__try_stop_module
, &sref
, NULL
);
675 /* We don't need to stop the machine for this. */
676 mod
->state
= MODULE_STATE_GOING
;
682 unsigned int module_refcount(struct module
*mod
)
684 unsigned int incs
= 0, decs
= 0;
687 for_each_possible_cpu(cpu
)
688 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
690 * ensure the incs are added up after the decs.
691 * module_put ensures incs are visible before decs with smp_wmb.
693 * This 2-count scheme avoids the situation where the refcount
694 * for CPU0 is read, then CPU0 increments the module refcount,
695 * then CPU1 drops that refcount, then the refcount for CPU1 is
696 * read. We would record a decrement but not its corresponding
697 * increment so we would see a low count (disaster).
699 * Rare situation? But module_refcount can be preempted, and we
700 * might be tallying up 4096+ CPUs. So it is not impossible.
703 for_each_possible_cpu(cpu
)
704 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
707 EXPORT_SYMBOL(module_refcount
);
709 /* This exists whether we can unload or not */
710 static void free_module(struct module
*mod
);
712 static void wait_for_zero_refcount(struct module
*mod
)
714 /* Since we might sleep for some time, release the mutex first */
715 mutex_unlock(&module_mutex
);
717 DEBUGP("Looking at refcount...\n");
718 set_current_state(TASK_UNINTERRUPTIBLE
);
719 if (module_refcount(mod
) == 0)
723 current
->state
= TASK_RUNNING
;
724 mutex_lock(&module_mutex
);
727 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
731 char name
[MODULE_NAME_LEN
];
734 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
737 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
739 name
[MODULE_NAME_LEN
-1] = '\0';
741 if (mutex_lock_interruptible(&module_mutex
) != 0)
744 mod
= find_module(name
);
750 if (!list_empty(&mod
->source_list
)) {
751 /* Other modules depend on us: get rid of them first. */
756 /* Doing init or already dying? */
757 if (mod
->state
!= MODULE_STATE_LIVE
) {
758 /* FIXME: if (force), slam module count and wake up
760 DEBUGP("%s already dying\n", mod
->name
);
765 /* If it has an init func, it must have an exit func to unload */
766 if (mod
->init
&& !mod
->exit
) {
767 forced
= try_force_unload(flags
);
769 /* This module can't be removed */
775 /* Set this up before setting mod->state */
776 mod
->waiter
= current
;
778 /* Stop the machine so refcounts can't move and disable module. */
779 ret
= try_stop_module(mod
, flags
, &forced
);
783 /* Never wait if forced. */
784 if (!forced
&& module_refcount(mod
) != 0)
785 wait_for_zero_refcount(mod
);
787 mutex_unlock(&module_mutex
);
788 /* Final destruction now noone is using it. */
789 if (mod
->exit
!= NULL
)
791 blocking_notifier_call_chain(&module_notify_list
,
792 MODULE_STATE_GOING
, mod
);
793 async_synchronize_full();
795 /* Store the name of the last unloaded module for diagnostic purposes */
796 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
797 ddebug_remove_module(mod
->name
);
802 mutex_unlock(&module_mutex
);
806 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
808 struct module_use
*use
;
809 int printed_something
= 0;
811 seq_printf(m
, " %u ", module_refcount(mod
));
813 /* Always include a trailing , so userspace can differentiate
814 between this and the old multi-field proc format. */
815 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
816 printed_something
= 1;
817 seq_printf(m
, "%s,", use
->source
->name
);
820 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
821 printed_something
= 1;
822 seq_printf(m
, "[permanent],");
825 if (!printed_something
)
829 void __symbol_put(const char *symbol
)
831 struct module
*owner
;
834 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
839 EXPORT_SYMBOL(__symbol_put
);
841 /* Note this assumes addr is a function, which it currently always is. */
842 void symbol_put_addr(void *addr
)
844 struct module
*modaddr
;
845 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
847 if (core_kernel_text(a
))
850 /* module_text_address is safe here: we're supposed to have reference
851 * to module from symbol_get, so it can't go away. */
852 modaddr
= __module_text_address(a
);
856 EXPORT_SYMBOL_GPL(symbol_put_addr
);
858 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
859 struct module
*mod
, char *buffer
)
861 return sprintf(buffer
, "%u\n", module_refcount(mod
));
864 static struct module_attribute refcnt
= {
865 .attr
= { .name
= "refcnt", .mode
= 0444 },
869 void module_put(struct module
*module
)
873 smp_wmb(); /* see comment in module_refcount */
874 __this_cpu_inc(module
->refptr
->decs
);
876 trace_module_put(module
, _RET_IP_
);
877 /* Maybe they're waiting for us to drop reference? */
878 if (unlikely(!module_is_live(module
)))
879 wake_up_process(module
->waiter
);
883 EXPORT_SYMBOL(module_put
);
885 #else /* !CONFIG_MODULE_UNLOAD */
886 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
888 /* We don't know the usage count, or what modules are using. */
889 seq_printf(m
, " - -");
892 static inline void module_unload_free(struct module
*mod
)
896 int use_module(struct module
*a
, struct module
*b
)
898 return strong_try_module_get(b
) == 0;
900 EXPORT_SYMBOL_GPL(use_module
);
902 static inline void module_unload_init(struct module
*mod
)
905 #endif /* CONFIG_MODULE_UNLOAD */
907 static ssize_t
show_initstate(struct module_attribute
*mattr
,
908 struct module
*mod
, char *buffer
)
910 const char *state
= "unknown";
912 switch (mod
->state
) {
913 case MODULE_STATE_LIVE
:
916 case MODULE_STATE_COMING
:
919 case MODULE_STATE_GOING
:
923 return sprintf(buffer
, "%s\n", state
);
926 static struct module_attribute initstate
= {
927 .attr
= { .name
= "initstate", .mode
= 0444 },
928 .show
= show_initstate
,
931 static struct module_attribute
*modinfo_attrs
[] = {
935 #ifdef CONFIG_MODULE_UNLOAD
941 static const char vermagic
[] = VERMAGIC_STRING
;
943 static int try_to_force_load(struct module
*mod
, const char *reason
)
945 #ifdef CONFIG_MODULE_FORCE_LOAD
946 if (!test_taint(TAINT_FORCED_MODULE
))
947 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
949 add_taint_module(mod
, TAINT_FORCED_MODULE
);
956 #ifdef CONFIG_MODVERSIONS
957 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
958 static unsigned long maybe_relocated(unsigned long crc
,
959 const struct module
*crc_owner
)
961 #ifdef ARCH_RELOCATES_KCRCTAB
962 if (crc_owner
== NULL
)
963 return crc
- (unsigned long)reloc_start
;
968 static int check_version(Elf_Shdr
*sechdrs
,
969 unsigned int versindex
,
972 const unsigned long *crc
,
973 const struct module
*crc_owner
)
975 unsigned int i
, num_versions
;
976 struct modversion_info
*versions
;
978 /* Exporting module didn't supply crcs? OK, we're already tainted. */
982 /* No versions at all? modprobe --force does this. */
984 return try_to_force_load(mod
, symname
) == 0;
986 versions
= (void *) sechdrs
[versindex
].sh_addr
;
987 num_versions
= sechdrs
[versindex
].sh_size
988 / sizeof(struct modversion_info
);
990 for (i
= 0; i
< num_versions
; i
++) {
991 if (strcmp(versions
[i
].name
, symname
) != 0)
994 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
996 DEBUGP("Found checksum %lX vs module %lX\n",
997 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1001 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1002 mod
->name
, symname
);
1006 printk("%s: disagrees about version of symbol %s\n",
1007 mod
->name
, symname
);
1011 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1012 unsigned int versindex
,
1015 const unsigned long *crc
;
1017 /* Since this should be found in kernel (which can't be removed),
1018 * no locking is necessary. */
1019 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1022 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1026 /* First part is kernel version, which we ignore if module has crcs. */
1027 static inline int same_magic(const char *amagic
, const char *bmagic
,
1031 amagic
+= strcspn(amagic
, " ");
1032 bmagic
+= strcspn(bmagic
, " ");
1034 return strcmp(amagic
, bmagic
) == 0;
1037 static inline int check_version(Elf_Shdr
*sechdrs
,
1038 unsigned int versindex
,
1039 const char *symname
,
1041 const unsigned long *crc
,
1042 const struct module
*crc_owner
)
1047 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1048 unsigned int versindex
,
1054 static inline int same_magic(const char *amagic
, const char *bmagic
,
1057 return strcmp(amagic
, bmagic
) == 0;
1059 #endif /* CONFIG_MODVERSIONS */
1061 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1062 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1063 unsigned int versindex
,
1067 struct module
*owner
;
1068 const struct kernel_symbol
*sym
;
1069 const unsigned long *crc
;
1071 mutex_lock(&module_mutex
);
1072 sym
= find_symbol(name
, &owner
, &crc
,
1073 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1074 /* use_module can fail due to OOM,
1075 or module initialization or unloading */
1077 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
, owner
)
1078 || !use_module(mod
, owner
))
1081 mutex_unlock(&module_mutex
);
1086 * /sys/module/foo/sections stuff
1087 * J. Corbet <corbet@lwn.net>
1089 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1091 static inline bool sect_empty(const Elf_Shdr
*sect
)
1093 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1096 struct module_sect_attr
1098 struct module_attribute mattr
;
1100 unsigned long address
;
1103 struct module_sect_attrs
1105 struct attribute_group grp
;
1106 unsigned int nsections
;
1107 struct module_sect_attr attrs
[0];
1110 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1111 struct module
*mod
, char *buf
)
1113 struct module_sect_attr
*sattr
=
1114 container_of(mattr
, struct module_sect_attr
, mattr
);
1115 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1118 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1120 unsigned int section
;
1122 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1123 kfree(sect_attrs
->attrs
[section
].name
);
1127 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1128 char *secstrings
, Elf_Shdr
*sechdrs
)
1130 unsigned int nloaded
= 0, i
, size
[2];
1131 struct module_sect_attrs
*sect_attrs
;
1132 struct module_sect_attr
*sattr
;
1133 struct attribute
**gattr
;
1135 /* Count loaded sections and allocate structures */
1136 for (i
= 0; i
< nsect
; i
++)
1137 if (!sect_empty(&sechdrs
[i
]))
1139 size
[0] = ALIGN(sizeof(*sect_attrs
)
1140 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1141 sizeof(sect_attrs
->grp
.attrs
[0]));
1142 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1143 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1144 if (sect_attrs
== NULL
)
1147 /* Setup section attributes. */
1148 sect_attrs
->grp
.name
= "sections";
1149 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1151 sect_attrs
->nsections
= 0;
1152 sattr
= §_attrs
->attrs
[0];
1153 gattr
= §_attrs
->grp
.attrs
[0];
1154 for (i
= 0; i
< nsect
; i
++) {
1155 if (sect_empty(&sechdrs
[i
]))
1157 sattr
->address
= sechdrs
[i
].sh_addr
;
1158 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1160 if (sattr
->name
== NULL
)
1162 sect_attrs
->nsections
++;
1163 sysfs_attr_init(&sattr
->mattr
.attr
);
1164 sattr
->mattr
.show
= module_sect_show
;
1165 sattr
->mattr
.store
= NULL
;
1166 sattr
->mattr
.attr
.name
= sattr
->name
;
1167 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1168 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1172 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1175 mod
->sect_attrs
= sect_attrs
;
1178 free_sect_attrs(sect_attrs
);
1181 static void remove_sect_attrs(struct module
*mod
)
1183 if (mod
->sect_attrs
) {
1184 sysfs_remove_group(&mod
->mkobj
.kobj
,
1185 &mod
->sect_attrs
->grp
);
1186 /* We are positive that no one is using any sect attrs
1187 * at this point. Deallocate immediately. */
1188 free_sect_attrs(mod
->sect_attrs
);
1189 mod
->sect_attrs
= NULL
;
1194 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1197 struct module_notes_attrs
{
1198 struct kobject
*dir
;
1200 struct bin_attribute attrs
[0];
1203 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1204 struct bin_attribute
*bin_attr
,
1205 char *buf
, loff_t pos
, size_t count
)
1208 * The caller checked the pos and count against our size.
1210 memcpy(buf
, bin_attr
->private + pos
, count
);
1214 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1217 if (notes_attrs
->dir
) {
1219 sysfs_remove_bin_file(notes_attrs
->dir
,
1220 ¬es_attrs
->attrs
[i
]);
1221 kobject_put(notes_attrs
->dir
);
1226 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1227 char *secstrings
, Elf_Shdr
*sechdrs
)
1229 unsigned int notes
, loaded
, i
;
1230 struct module_notes_attrs
*notes_attrs
;
1231 struct bin_attribute
*nattr
;
1233 /* failed to create section attributes, so can't create notes */
1234 if (!mod
->sect_attrs
)
1237 /* Count notes sections and allocate structures. */
1239 for (i
= 0; i
< nsect
; i
++)
1240 if (!sect_empty(&sechdrs
[i
]) &&
1241 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1247 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1248 + notes
* sizeof(notes_attrs
->attrs
[0]),
1250 if (notes_attrs
== NULL
)
1253 notes_attrs
->notes
= notes
;
1254 nattr
= ¬es_attrs
->attrs
[0];
1255 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1256 if (sect_empty(&sechdrs
[i
]))
1258 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1259 sysfs_bin_attr_init(nattr
);
1260 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1261 nattr
->attr
.mode
= S_IRUGO
;
1262 nattr
->size
= sechdrs
[i
].sh_size
;
1263 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1264 nattr
->read
= module_notes_read
;
1270 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1271 if (!notes_attrs
->dir
)
1274 for (i
= 0; i
< notes
; ++i
)
1275 if (sysfs_create_bin_file(notes_attrs
->dir
,
1276 ¬es_attrs
->attrs
[i
]))
1279 mod
->notes_attrs
= notes_attrs
;
1283 free_notes_attrs(notes_attrs
, i
);
1286 static void remove_notes_attrs(struct module
*mod
)
1288 if (mod
->notes_attrs
)
1289 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1294 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1295 char *sectstrings
, Elf_Shdr
*sechdrs
)
1299 static inline void remove_sect_attrs(struct module
*mod
)
1303 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1304 char *sectstrings
, Elf_Shdr
*sechdrs
)
1308 static inline void remove_notes_attrs(struct module
*mod
)
1314 static void add_usage_links(struct module
*mod
)
1316 #ifdef CONFIG_MODULE_UNLOAD
1317 struct module_use
*use
;
1320 mutex_lock(&module_mutex
);
1321 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1322 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1323 &mod
->mkobj
.kobj
, mod
->name
);
1325 mutex_unlock(&module_mutex
);
1329 static void del_usage_links(struct module
*mod
)
1331 #ifdef CONFIG_MODULE_UNLOAD
1332 struct module_use
*use
;
1334 mutex_lock(&module_mutex
);
1335 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1336 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1337 mutex_unlock(&module_mutex
);
1341 static int module_add_modinfo_attrs(struct module
*mod
)
1343 struct module_attribute
*attr
;
1344 struct module_attribute
*temp_attr
;
1348 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1349 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1351 if (!mod
->modinfo_attrs
)
1354 temp_attr
= mod
->modinfo_attrs
;
1355 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1357 (attr
->test
&& attr
->test(mod
))) {
1358 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1359 sysfs_attr_init(&temp_attr
->attr
);
1360 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1367 static void module_remove_modinfo_attrs(struct module
*mod
)
1369 struct module_attribute
*attr
;
1372 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1373 /* pick a field to test for end of list */
1374 if (!attr
->attr
.name
)
1376 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1380 kfree(mod
->modinfo_attrs
);
1383 static int mod_sysfs_init(struct module
*mod
)
1386 struct kobject
*kobj
;
1388 if (!module_sysfs_initialized
) {
1389 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1395 kobj
= kset_find_obj(module_kset
, mod
->name
);
1397 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1403 mod
->mkobj
.mod
= mod
;
1405 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1406 mod
->mkobj
.kobj
.kset
= module_kset
;
1407 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1410 kobject_put(&mod
->mkobj
.kobj
);
1412 /* delay uevent until full sysfs population */
1417 static int mod_sysfs_setup(struct module
*mod
,
1418 struct kernel_param
*kparam
,
1419 unsigned int num_params
)
1423 err
= mod_sysfs_init(mod
);
1427 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1428 if (!mod
->holders_dir
) {
1433 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1435 goto out_unreg_holders
;
1437 err
= module_add_modinfo_attrs(mod
);
1439 goto out_unreg_param
;
1441 add_usage_links(mod
);
1443 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1447 module_param_sysfs_remove(mod
);
1449 kobject_put(mod
->holders_dir
);
1451 kobject_put(&mod
->mkobj
.kobj
);
1456 static void mod_sysfs_fini(struct module
*mod
)
1458 kobject_put(&mod
->mkobj
.kobj
);
1461 #else /* CONFIG_SYSFS */
1463 static inline int mod_sysfs_init(struct module
*mod
)
1468 static inline int mod_sysfs_setup(struct module
*mod
,
1469 struct kernel_param
*kparam
,
1470 unsigned int num_params
)
1475 static inline int module_add_modinfo_attrs(struct module
*mod
)
1480 static inline void module_remove_modinfo_attrs(struct module
*mod
)
1484 static void mod_sysfs_fini(struct module
*mod
)
1488 static void del_usage_links(struct module
*mod
)
1492 #endif /* CONFIG_SYSFS */
1494 static void mod_kobject_remove(struct module
*mod
)
1496 del_usage_links(mod
);
1497 module_remove_modinfo_attrs(mod
);
1498 module_param_sysfs_remove(mod
);
1499 kobject_put(mod
->mkobj
.drivers_dir
);
1500 kobject_put(mod
->holders_dir
);
1501 mod_sysfs_fini(mod
);
1505 * unlink the module with the whole machine is stopped with interrupts off
1506 * - this defends against kallsyms not taking locks
1508 static int __unlink_module(void *_mod
)
1510 struct module
*mod
= _mod
;
1511 list_del(&mod
->list
);
1515 /* Free a module, remove from lists, etc. */
1516 static void free_module(struct module
*mod
)
1518 trace_module_free(mod
);
1520 /* Delete from various lists */
1521 mutex_lock(&module_mutex
);
1522 stop_machine(__unlink_module
, mod
, NULL
);
1523 mutex_unlock(&module_mutex
);
1524 remove_notes_attrs(mod
);
1525 remove_sect_attrs(mod
);
1526 mod_kobject_remove(mod
);
1528 /* Arch-specific cleanup. */
1529 module_arch_cleanup(mod
);
1531 /* Module unload stuff */
1532 module_unload_free(mod
);
1534 /* Free any allocated parameters. */
1535 destroy_params(mod
->kp
, mod
->num_kp
);
1537 /* This may be NULL, but that's OK */
1538 module_free(mod
, mod
->module_init
);
1540 percpu_modfree(mod
);
1541 #if defined(CONFIG_MODULE_UNLOAD)
1543 free_percpu(mod
->refptr
);
1545 /* Free lock-classes: */
1546 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1548 /* Finally, free the core (containing the module structure) */
1549 module_free(mod
, mod
->module_core
);
1552 update_protections(current
->mm
);
1556 void *__symbol_get(const char *symbol
)
1558 struct module
*owner
;
1559 const struct kernel_symbol
*sym
;
1562 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1563 if (sym
&& strong_try_module_get(owner
))
1567 return sym
? (void *)sym
->value
: NULL
;
1569 EXPORT_SYMBOL_GPL(__symbol_get
);
1572 * Ensure that an exported symbol [global namespace] does not already exist
1573 * in the kernel or in some other module's exported symbol table.
1575 static int verify_export_symbols(struct module
*mod
)
1578 struct module
*owner
;
1579 const struct kernel_symbol
*s
;
1581 const struct kernel_symbol
*sym
;
1584 { mod
->syms
, mod
->num_syms
},
1585 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1586 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1587 #ifdef CONFIG_UNUSED_SYMBOLS
1588 { mod
->unused_syms
, mod
->num_unused_syms
},
1589 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1593 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1594 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1595 const struct kernel_symbol
*sym
;
1597 /* Stopping preemption makes find_symbol safe. */
1599 sym
= find_symbol(s
->name
, &owner
, NULL
, true, false);
1604 "%s: exports duplicate symbol %s"
1606 mod
->name
, s
->name
, module_name(owner
));
1614 /* Change all symbols so that st_value encodes the pointer directly. */
1615 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1616 unsigned int symindex
,
1618 unsigned int versindex
,
1619 unsigned int pcpuindex
,
1622 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1623 unsigned long secbase
;
1624 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1626 const struct kernel_symbol
*ksym
;
1628 for (i
= 1; i
< n
; i
++) {
1629 switch (sym
[i
].st_shndx
) {
1631 /* We compiled with -fno-common. These are not
1632 supposed to happen. */
1633 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1634 printk("%s: please compile with -fno-common\n",
1640 /* Don't need to do anything */
1641 DEBUGP("Absolute symbol: 0x%08lx\n",
1642 (long)sym
[i
].st_value
);
1646 ksym
= resolve_symbol(sechdrs
, versindex
,
1647 strtab
+ sym
[i
].st_name
, mod
);
1648 /* Ok if resolved. */
1650 sym
[i
].st_value
= ksym
->value
;
1655 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1658 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1659 mod
->name
, strtab
+ sym
[i
].st_name
);
1664 /* Divert to percpu allocation if a percpu var. */
1665 if (sym
[i
].st_shndx
== pcpuindex
)
1666 secbase
= (unsigned long)mod_percpu(mod
);
1668 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1669 sym
[i
].st_value
+= secbase
;
1677 /* Additional bytes needed by arch in front of individual sections */
1678 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1679 unsigned int section
)
1681 /* default implementation just returns zero */
1685 /* Update size with this section: return offset. */
1686 static long get_offset(struct module
*mod
, unsigned int *size
,
1687 Elf_Shdr
*sechdr
, unsigned int section
)
1691 *size
+= arch_mod_section_prepend(mod
, section
);
1692 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1693 *size
= ret
+ sechdr
->sh_size
;
1697 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1698 might -- code, read-only data, read-write data, small data. Tally
1699 sizes, and place the offsets into sh_entsize fields: high bit means it
1701 static void layout_sections(struct module
*mod
,
1702 const Elf_Ehdr
*hdr
,
1704 const char *secstrings
)
1706 static unsigned long const masks
[][2] = {
1707 /* NOTE: all executable code must be the first section
1708 * in this array; otherwise modify the text_size
1709 * finder in the two loops below */
1710 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1711 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1712 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1713 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1717 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1718 sechdrs
[i
].sh_entsize
= ~0UL;
1720 DEBUGP("Core section allocation order:\n");
1721 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1722 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1723 Elf_Shdr
*s
= &sechdrs
[i
];
1725 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1726 || (s
->sh_flags
& masks
[m
][1])
1727 || s
->sh_entsize
!= ~0UL
1728 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1730 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1731 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1734 mod
->core_text_size
= mod
->core_size
;
1737 DEBUGP("Init section allocation order:\n");
1738 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1739 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1740 Elf_Shdr
*s
= &sechdrs
[i
];
1742 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1743 || (s
->sh_flags
& masks
[m
][1])
1744 || s
->sh_entsize
!= ~0UL
1745 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1747 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1748 | INIT_OFFSET_MASK
);
1749 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1752 mod
->init_text_size
= mod
->init_size
;
1756 static void set_license(struct module
*mod
, const char *license
)
1759 license
= "unspecified";
1761 if (!license_is_gpl_compatible(license
)) {
1762 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1763 printk(KERN_WARNING
"%s: module license '%s' taints "
1764 "kernel.\n", mod
->name
, license
);
1765 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1769 /* Parse tag=value strings from .modinfo section */
1770 static char *next_string(char *string
, unsigned long *secsize
)
1772 /* Skip non-zero chars */
1775 if ((*secsize
)-- <= 1)
1779 /* Skip any zero padding. */
1780 while (!string
[0]) {
1782 if ((*secsize
)-- <= 1)
1788 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1793 unsigned int taglen
= strlen(tag
);
1794 unsigned long size
= sechdrs
[info
].sh_size
;
1796 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1797 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1798 return p
+ taglen
+ 1;
1803 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1804 unsigned int infoindex
)
1806 struct module_attribute
*attr
;
1809 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1812 get_modinfo(sechdrs
,
1818 static void free_modinfo(struct module
*mod
)
1820 struct module_attribute
*attr
;
1823 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1829 #ifdef CONFIG_KALLSYMS
1831 /* lookup symbol in given range of kernel_symbols */
1832 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1833 const struct kernel_symbol
*start
,
1834 const struct kernel_symbol
*stop
)
1836 const struct kernel_symbol
*ks
= start
;
1837 for (; ks
< stop
; ks
++)
1838 if (strcmp(ks
->name
, name
) == 0)
1843 static int is_exported(const char *name
, unsigned long value
,
1844 const struct module
*mod
)
1846 const struct kernel_symbol
*ks
;
1848 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1850 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1851 return ks
!= NULL
&& ks
->value
== value
;
1855 static char elf_type(const Elf_Sym
*sym
,
1857 const char *secstrings
,
1860 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1861 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1866 if (sym
->st_shndx
== SHN_UNDEF
)
1868 if (sym
->st_shndx
== SHN_ABS
)
1870 if (sym
->st_shndx
>= SHN_LORESERVE
)
1872 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1874 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1875 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1876 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1878 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1883 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1884 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1889 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1894 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
1897 const Elf_Shdr
*sec
;
1899 if (src
->st_shndx
== SHN_UNDEF
1900 || src
->st_shndx
>= shnum
1904 sec
= sechdrs
+ src
->st_shndx
;
1905 if (!(sec
->sh_flags
& SHF_ALLOC
)
1906 #ifndef CONFIG_KALLSYMS_ALL
1907 || !(sec
->sh_flags
& SHF_EXECINSTR
)
1909 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
1915 static unsigned long layout_symtab(struct module
*mod
,
1917 unsigned int symindex
,
1918 unsigned int strindex
,
1919 const Elf_Ehdr
*hdr
,
1920 const char *secstrings
,
1921 unsigned long *pstroffs
,
1922 unsigned long *strmap
)
1924 unsigned long symoffs
;
1925 Elf_Shdr
*symsect
= sechdrs
+ symindex
;
1926 Elf_Shdr
*strsect
= sechdrs
+ strindex
;
1929 unsigned int i
, nsrc
, ndst
;
1931 /* Put symbol section at end of init part of module. */
1932 symsect
->sh_flags
|= SHF_ALLOC
;
1933 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
1934 symindex
) | INIT_OFFSET_MASK
;
1935 DEBUGP("\t%s\n", secstrings
+ symsect
->sh_name
);
1937 src
= (void *)hdr
+ symsect
->sh_offset
;
1938 nsrc
= symsect
->sh_size
/ sizeof(*src
);
1939 strtab
= (void *)hdr
+ strsect
->sh_offset
;
1940 for (ndst
= i
= 1; i
< nsrc
; ++i
, ++src
)
1941 if (is_core_symbol(src
, sechdrs
, hdr
->e_shnum
)) {
1942 unsigned int j
= src
->st_name
;
1944 while(!__test_and_set_bit(j
, strmap
) && strtab
[j
])
1949 /* Append room for core symbols at end of core part. */
1950 symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
1951 mod
->core_size
= symoffs
+ ndst
* sizeof(Elf_Sym
);
1953 /* Put string table section at end of init part of module. */
1954 strsect
->sh_flags
|= SHF_ALLOC
;
1955 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
1956 strindex
) | INIT_OFFSET_MASK
;
1957 DEBUGP("\t%s\n", secstrings
+ strsect
->sh_name
);
1959 /* Append room for core symbols' strings at end of core part. */
1960 *pstroffs
= mod
->core_size
;
1961 __set_bit(0, strmap
);
1962 mod
->core_size
+= bitmap_weight(strmap
, strsect
->sh_size
);
1967 static void add_kallsyms(struct module
*mod
,
1970 unsigned int symindex
,
1971 unsigned int strindex
,
1972 unsigned long symoffs
,
1973 unsigned long stroffs
,
1974 const char *secstrings
,
1975 unsigned long *strmap
)
1977 unsigned int i
, ndst
;
1982 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1983 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1984 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1986 /* Set types up while we still have access to sections. */
1987 for (i
= 0; i
< mod
->num_symtab
; i
++)
1988 mod
->symtab
[i
].st_info
1989 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1991 mod
->core_symtab
= dst
= mod
->module_core
+ symoffs
;
1994 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
1995 if (!is_core_symbol(src
, sechdrs
, shnum
))
1998 dst
[ndst
].st_name
= bitmap_weight(strmap
, dst
[ndst
].st_name
);
2001 mod
->core_num_syms
= ndst
;
2003 mod
->core_strtab
= s
= mod
->module_core
+ stroffs
;
2004 for (*s
= 0, i
= 1; i
< sechdrs
[strindex
].sh_size
; ++i
)
2005 if (test_bit(i
, strmap
))
2006 *++s
= mod
->strtab
[i
];
2009 static inline unsigned long layout_symtab(struct module
*mod
,
2011 unsigned int symindex
,
2012 unsigned int strindex
,
2013 const Elf_Ehdr
*hdr
,
2014 const char *secstrings
,
2015 unsigned long *pstroffs
,
2016 unsigned long *strmap
)
2021 static inline void add_kallsyms(struct module
*mod
,
2024 unsigned int symindex
,
2025 unsigned int strindex
,
2026 unsigned long symoffs
,
2027 unsigned long stroffs
,
2028 const char *secstrings
,
2029 const unsigned long *strmap
)
2032 #endif /* CONFIG_KALLSYMS */
2034 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2036 #ifdef CONFIG_DYNAMIC_DEBUG
2037 if (ddebug_add_module(debug
, num
, debug
->modname
))
2038 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2043 static void *module_alloc_update_bounds(unsigned long size
)
2045 void *ret
= module_alloc(size
);
2048 mutex_lock(&module_mutex
);
2049 /* Update module bounds. */
2050 if ((unsigned long)ret
< module_addr_min
)
2051 module_addr_min
= (unsigned long)ret
;
2052 if ((unsigned long)ret
+ size
> module_addr_max
)
2053 module_addr_max
= (unsigned long)ret
+ size
;
2054 mutex_unlock(&module_mutex
);
2059 #ifdef CONFIG_DEBUG_KMEMLEAK
2060 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2061 Elf_Shdr
*sechdrs
, char *secstrings
)
2065 /* only scan the sections containing data */
2066 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2068 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2069 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2071 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
2072 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
2075 kmemleak_scan_area((void *)sechdrs
[i
].sh_addr
,
2076 sechdrs
[i
].sh_size
, GFP_KERNEL
);
2080 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2081 Elf_Shdr
*sechdrs
, char *secstrings
)
2086 /* Allocate and load the module: note that size of section 0 is always
2087 zero, and we rely on this for optional sections. */
2088 static noinline
struct module
*load_module(void __user
*umod
,
2090 const char __user
*uargs
)
2094 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
2097 unsigned int symindex
= 0;
2098 unsigned int strindex
= 0;
2099 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
2102 void *ptr
= NULL
; /* Stops spurious gcc warning */
2103 unsigned long symoffs
, stroffs
, *strmap
;
2104 void __percpu
*percpu
;
2106 mm_segment_t old_fs
;
2108 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2110 if (len
< sizeof(*hdr
))
2111 return ERR_PTR(-ENOEXEC
);
2113 /* Suck in entire file: we'll want most of it. */
2114 /* vmalloc barfs on "unusual" numbers. Check here */
2115 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
2116 return ERR_PTR(-ENOMEM
);
2118 if (copy_from_user(hdr
, umod
, len
) != 0) {
2123 /* Sanity checks against insmoding binaries or wrong arch,
2124 weird elf version */
2125 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2126 || hdr
->e_type
!= ET_REL
2127 || !elf_check_arch(hdr
)
2128 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
2133 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
2136 /* Convenience variables */
2137 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
2138 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
2139 sechdrs
[0].sh_addr
= 0;
2141 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2142 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
2143 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
2146 /* Mark all sections sh_addr with their address in the
2148 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
2150 /* Internal symbols and strings. */
2151 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2153 strindex
= sechdrs
[i
].sh_link
;
2154 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
2156 #ifndef CONFIG_MODULE_UNLOAD
2157 /* Don't load .exit sections */
2158 if (strstarts(secstrings
+sechdrs
[i
].sh_name
, ".exit"))
2159 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2163 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
2164 ".gnu.linkonce.this_module");
2166 printk(KERN_WARNING
"No module found in object\n");
2170 /* This is temporary: point mod into copy of data. */
2171 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2173 if (symindex
== 0) {
2174 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2180 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
2181 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
2182 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
2184 /* Don't keep modinfo and version sections. */
2185 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2186 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2188 /* Check module struct version now, before we try to use module. */
2189 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
2194 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2195 /* This is allowed: modprobe --force will invalidate it. */
2197 err
= try_to_force_load(mod
, "bad vermagic");
2200 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2201 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2202 mod
->name
, modmagic
, vermagic
);
2207 staging
= get_modinfo(sechdrs
, infoindex
, "staging");
2209 add_taint_module(mod
, TAINT_CRAP
);
2210 printk(KERN_WARNING
"%s: module is from the staging directory,"
2211 " the quality is unknown, you have been warned.\n",
2215 /* Now copy in args */
2216 args
= strndup_user(uargs
, ~0UL >> 1);
2218 err
= PTR_ERR(args
);
2222 strmap
= kzalloc(BITS_TO_LONGS(sechdrs
[strindex
].sh_size
)
2223 * sizeof(long), GFP_KERNEL
);
2229 if (find_module(mod
->name
)) {
2234 mod
->state
= MODULE_STATE_COMING
;
2236 /* Allow arches to frob section contents and sizes. */
2237 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2242 /* We have a special allocation for this section. */
2243 err
= percpu_modalloc(mod
, sechdrs
[pcpuindex
].sh_size
,
2244 sechdrs
[pcpuindex
].sh_addralign
);
2247 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2249 /* Keep this around for failure path. */
2250 percpu
= mod_percpu(mod
);
2252 /* Determine total sizes, and put offsets in sh_entsize. For now
2253 this is done generically; there doesn't appear to be any
2254 special cases for the architectures. */
2255 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2256 symoffs
= layout_symtab(mod
, sechdrs
, symindex
, strindex
, hdr
,
2257 secstrings
, &stroffs
, strmap
);
2259 /* Do the allocs. */
2260 ptr
= module_alloc_update_bounds(mod
->core_size
);
2262 * The pointer to this block is stored in the module structure
2263 * which is inside the block. Just mark it as not being a
2266 kmemleak_not_leak(ptr
);
2271 memset(ptr
, 0, mod
->core_size
);
2272 mod
->module_core
= ptr
;
2274 ptr
= module_alloc_update_bounds(mod
->init_size
);
2276 * The pointer to this block is stored in the module structure
2277 * which is inside the block. This block doesn't need to be
2278 * scanned as it contains data and code that will be freed
2279 * after the module is initialized.
2281 kmemleak_ignore(ptr
);
2282 if (!ptr
&& mod
->init_size
) {
2286 memset(ptr
, 0, mod
->init_size
);
2287 mod
->module_init
= ptr
;
2289 /* Transfer each section which specifies SHF_ALLOC */
2290 DEBUGP("final section addresses:\n");
2291 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2294 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2297 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2298 dest
= mod
->module_init
2299 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2301 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2303 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2304 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2305 sechdrs
[i
].sh_size
);
2306 /* Update sh_addr to point to copy in image. */
2307 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2308 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2310 /* Module has been moved. */
2311 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2312 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2314 #if defined(CONFIG_MODULE_UNLOAD)
2315 mod
->refptr
= alloc_percpu(struct module_ref
);
2321 /* Now we've moved module, initialize linked lists, etc. */
2322 module_unload_init(mod
);
2324 /* Set up license info based on the info section */
2325 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2328 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2329 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2330 * using GPL-only symbols it needs.
2332 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2333 add_taint(TAINT_PROPRIETARY_MODULE
);
2335 /* driverloader was caught wrongly pretending to be under GPL */
2336 if (strcmp(mod
->name
, "driverloader") == 0)
2337 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2339 /* Set up MODINFO_ATTR fields */
2340 setup_modinfo(mod
, sechdrs
, infoindex
);
2342 /* Fix up syms, so that st_value is a pointer to location. */
2343 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2348 /* Now we've got everything in the final locations, we can
2349 * find optional sections. */
2350 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2351 sizeof(*mod
->kp
), &mod
->num_kp
);
2352 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2353 sizeof(*mod
->syms
), &mod
->num_syms
);
2354 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2355 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2356 sizeof(*mod
->gpl_syms
),
2357 &mod
->num_gpl_syms
);
2358 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2359 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2360 "__ksymtab_gpl_future",
2361 sizeof(*mod
->gpl_future_syms
),
2362 &mod
->num_gpl_future_syms
);
2363 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2364 "__kcrctab_gpl_future");
2366 #ifdef CONFIG_UNUSED_SYMBOLS
2367 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2369 sizeof(*mod
->unused_syms
),
2370 &mod
->num_unused_syms
);
2371 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2372 "__kcrctab_unused");
2373 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2374 "__ksymtab_unused_gpl",
2375 sizeof(*mod
->unused_gpl_syms
),
2376 &mod
->num_unused_gpl_syms
);
2377 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2378 "__kcrctab_unused_gpl");
2380 #ifdef CONFIG_CONSTRUCTORS
2381 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2382 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2385 #ifdef CONFIG_TRACEPOINTS
2386 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2388 sizeof(*mod
->tracepoints
),
2389 &mod
->num_tracepoints
);
2391 #ifdef CONFIG_EVENT_TRACING
2392 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2394 sizeof(*mod
->trace_events
),
2395 &mod
->num_trace_events
);
2397 * This section contains pointers to allocated objects in the trace
2398 * code and not scanning it leads to false positives.
2400 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2401 mod
->num_trace_events
, GFP_KERNEL
);
2403 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2404 /* sechdrs[0].sh_size is always zero */
2405 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2407 sizeof(*mod
->ftrace_callsites
),
2408 &mod
->num_ftrace_callsites
);
2410 #ifdef CONFIG_MODVERSIONS
2411 if ((mod
->num_syms
&& !mod
->crcs
)
2412 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2413 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2414 #ifdef CONFIG_UNUSED_SYMBOLS
2415 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2416 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2419 err
= try_to_force_load(mod
,
2420 "no versions for exported symbols");
2426 /* Now do relocations. */
2427 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2428 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2429 unsigned int info
= sechdrs
[i
].sh_info
;
2431 /* Not a valid relocation section? */
2432 if (info
>= hdr
->e_shnum
)
2435 /* Don't bother with non-allocated sections */
2436 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2439 if (sechdrs
[i
].sh_type
== SHT_REL
)
2440 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2441 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2442 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2448 /* Find duplicate symbols */
2449 err
= verify_export_symbols(mod
);
2453 /* Set up and sort exception table */
2454 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2455 sizeof(*mod
->extable
), &mod
->num_exentries
);
2456 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2458 /* Finally, copy percpu area over. */
2459 percpu_modcopy(mod
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2460 sechdrs
[pcpuindex
].sh_size
);
2462 add_kallsyms(mod
, sechdrs
, hdr
->e_shnum
, symindex
, strindex
,
2463 symoffs
, stroffs
, secstrings
, strmap
);
2468 struct _ddebug
*debug
;
2469 unsigned int num_debug
;
2471 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2472 sizeof(*debug
), &num_debug
);
2474 dynamic_debug_setup(debug
, num_debug
);
2477 err
= module_finalize(hdr
, sechdrs
, mod
);
2481 /* flush the icache in correct context */
2486 * Flush the instruction cache, since we've played with text.
2487 * Do it before processing of module parameters, so the module
2488 * can provide parameter accessor functions of its own.
2490 if (mod
->module_init
)
2491 flush_icache_range((unsigned long)mod
->module_init
,
2492 (unsigned long)mod
->module_init
2494 flush_icache_range((unsigned long)mod
->module_core
,
2495 (unsigned long)mod
->module_core
+ mod
->core_size
);
2500 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2501 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2504 /* Now sew it into the lists so we can get lockdep and oops
2505 * info during argument parsing. Noone should access us, since
2506 * strong_try_module_get() will fail.
2507 * lockdep/oops can run asynchronous, so use the RCU list insertion
2508 * function to insert in a way safe to concurrent readers.
2509 * The mutex protects against concurrent writers.
2511 mutex_lock(&module_mutex
);
2512 list_add_rcu(&mod
->list
, &modules
);
2513 mutex_unlock(&module_mutex
);
2515 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2519 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2523 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2524 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2526 /* Get rid of temporary copy */
2529 trace_module_load(mod
);
2535 mutex_lock(&module_mutex
);
2536 /* Unlink carefully: kallsyms could be walking list. */
2537 list_del_rcu(&mod
->list
);
2538 mutex_unlock(&module_mutex
);
2539 synchronize_sched();
2540 module_arch_cleanup(mod
);
2543 module_unload_free(mod
);
2544 #if defined(CONFIG_MODULE_UNLOAD)
2545 free_percpu(mod
->refptr
);
2548 module_free(mod
, mod
->module_init
);
2550 module_free(mod
, mod
->module_core
);
2551 /* mod will be freed with core. Don't access it beyond this line! */
2553 free_percpu(percpu
);
2559 return ERR_PTR(err
);
2562 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2567 /* Call module constructors. */
2568 static void do_mod_ctors(struct module
*mod
)
2570 #ifdef CONFIG_CONSTRUCTORS
2573 for (i
= 0; i
< mod
->num_ctors
; i
++)
2578 /* This is where the real work happens */
2579 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2580 unsigned long, len
, const char __user
*, uargs
)
2585 /* Must have permission */
2586 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2589 /* Do all the hard work */
2590 mod
= load_module(umod
, len
, uargs
);
2592 return PTR_ERR(mod
);
2594 blocking_notifier_call_chain(&module_notify_list
,
2595 MODULE_STATE_COMING
, mod
);
2598 /* Start the module */
2599 if (mod
->init
!= NULL
)
2600 ret
= do_one_initcall(mod
->init
);
2602 /* Init routine failed: abort. Try to protect us from
2603 buggy refcounters. */
2604 mod
->state
= MODULE_STATE_GOING
;
2605 synchronize_sched();
2607 blocking_notifier_call_chain(&module_notify_list
,
2608 MODULE_STATE_GOING
, mod
);
2610 wake_up(&module_wq
);
2615 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2616 "%s: loading module anyway...\n",
2617 __func__
, mod
->name
, ret
,
2622 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2623 mod
->state
= MODULE_STATE_LIVE
;
2624 wake_up(&module_wq
);
2625 blocking_notifier_call_chain(&module_notify_list
,
2626 MODULE_STATE_LIVE
, mod
);
2628 /* We need to finish all async code before the module init sequence is done */
2629 async_synchronize_full();
2631 mutex_lock(&module_mutex
);
2632 /* Drop initial reference. */
2634 trim_init_extable(mod
);
2635 #ifdef CONFIG_KALLSYMS
2636 mod
->num_symtab
= mod
->core_num_syms
;
2637 mod
->symtab
= mod
->core_symtab
;
2638 mod
->strtab
= mod
->core_strtab
;
2640 module_free(mod
, mod
->module_init
);
2641 mod
->module_init
= NULL
;
2643 mod
->init_text_size
= 0;
2644 mutex_unlock(&module_mutex
);
2649 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2651 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2654 #ifdef CONFIG_KALLSYMS
2656 * This ignores the intensely annoying "mapping symbols" found
2657 * in ARM ELF files: $a, $t and $d.
2659 static inline int is_arm_mapping_symbol(const char *str
)
2661 return str
[0] == '$' && strchr("atd", str
[1])
2662 && (str
[2] == '\0' || str
[2] == '.');
2665 static const char *get_ksymbol(struct module
*mod
,
2667 unsigned long *size
,
2668 unsigned long *offset
)
2670 unsigned int i
, best
= 0;
2671 unsigned long nextval
;
2673 /* At worse, next value is at end of module */
2674 if (within_module_init(addr
, mod
))
2675 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2677 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2679 /* Scan for closest preceeding symbol, and next symbol. (ELF
2680 starts real symbols at 1). */
2681 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2682 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2685 /* We ignore unnamed symbols: they're uninformative
2686 * and inserted at a whim. */
2687 if (mod
->symtab
[i
].st_value
<= addr
2688 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2689 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2690 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2692 if (mod
->symtab
[i
].st_value
> addr
2693 && mod
->symtab
[i
].st_value
< nextval
2694 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2695 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2696 nextval
= mod
->symtab
[i
].st_value
;
2703 *size
= nextval
- mod
->symtab
[best
].st_value
;
2705 *offset
= addr
- mod
->symtab
[best
].st_value
;
2706 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2709 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2710 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2711 const char *module_address_lookup(unsigned long addr
,
2712 unsigned long *size
,
2713 unsigned long *offset
,
2718 const char *ret
= NULL
;
2721 list_for_each_entry_rcu(mod
, &modules
, list
) {
2722 if (within_module_init(addr
, mod
) ||
2723 within_module_core(addr
, mod
)) {
2725 *modname
= mod
->name
;
2726 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2730 /* Make a copy in here where it's safe */
2732 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2739 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2744 list_for_each_entry_rcu(mod
, &modules
, list
) {
2745 if (within_module_init(addr
, mod
) ||
2746 within_module_core(addr
, mod
)) {
2749 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2752 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2762 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2763 unsigned long *offset
, char *modname
, char *name
)
2768 list_for_each_entry_rcu(mod
, &modules
, list
) {
2769 if (within_module_init(addr
, mod
) ||
2770 within_module_core(addr
, mod
)) {
2773 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2777 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2779 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2789 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2790 char *name
, char *module_name
, int *exported
)
2795 list_for_each_entry_rcu(mod
, &modules
, list
) {
2796 if (symnum
< mod
->num_symtab
) {
2797 *value
= mod
->symtab
[symnum
].st_value
;
2798 *type
= mod
->symtab
[symnum
].st_info
;
2799 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2801 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2802 *exported
= is_exported(name
, *value
, mod
);
2806 symnum
-= mod
->num_symtab
;
2812 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2816 for (i
= 0; i
< mod
->num_symtab
; i
++)
2817 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2818 mod
->symtab
[i
].st_info
!= 'U')
2819 return mod
->symtab
[i
].st_value
;
2823 /* Look for this name: can be of form module:name. */
2824 unsigned long module_kallsyms_lookup_name(const char *name
)
2828 unsigned long ret
= 0;
2830 /* Don't lock: we're in enough trouble already. */
2832 if ((colon
= strchr(name
, ':')) != NULL
) {
2834 if ((mod
= find_module(name
)) != NULL
)
2835 ret
= mod_find_symname(mod
, colon
+1);
2838 list_for_each_entry_rcu(mod
, &modules
, list
)
2839 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2846 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2847 struct module
*, unsigned long),
2854 list_for_each_entry(mod
, &modules
, list
) {
2855 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2856 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2857 mod
, mod
->symtab
[i
].st_value
);
2864 #endif /* CONFIG_KALLSYMS */
2866 static char *module_flags(struct module
*mod
, char *buf
)
2871 mod
->state
== MODULE_STATE_GOING
||
2872 mod
->state
== MODULE_STATE_COMING
) {
2874 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2876 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2878 if (mod
->taints
& (1 << TAINT_CRAP
))
2881 * TAINT_FORCED_RMMOD: could be added.
2882 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2886 /* Show a - for module-is-being-unloaded */
2887 if (mod
->state
== MODULE_STATE_GOING
)
2889 /* Show a + for module-is-being-loaded */
2890 if (mod
->state
== MODULE_STATE_COMING
)
2899 #ifdef CONFIG_PROC_FS
2900 /* Called by the /proc file system to return a list of modules. */
2901 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2903 mutex_lock(&module_mutex
);
2904 return seq_list_start(&modules
, *pos
);
2907 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2909 return seq_list_next(p
, &modules
, pos
);
2912 static void m_stop(struct seq_file
*m
, void *p
)
2914 mutex_unlock(&module_mutex
);
2917 static int m_show(struct seq_file
*m
, void *p
)
2919 struct module
*mod
= list_entry(p
, struct module
, list
);
2922 seq_printf(m
, "%s %u",
2923 mod
->name
, mod
->init_size
+ mod
->core_size
);
2924 print_unload_info(m
, mod
);
2926 /* Informative for users. */
2927 seq_printf(m
, " %s",
2928 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2929 mod
->state
== MODULE_STATE_COMING
? "Loading":
2931 /* Used by oprofile and other similar tools. */
2932 seq_printf(m
, " 0x%p", mod
->module_core
);
2936 seq_printf(m
, " %s", module_flags(mod
, buf
));
2938 seq_printf(m
, "\n");
2942 /* Format: modulename size refcount deps address
2944 Where refcount is a number or -, and deps is a comma-separated list
2947 static const struct seq_operations modules_op
= {
2954 static int modules_open(struct inode
*inode
, struct file
*file
)
2956 return seq_open(file
, &modules_op
);
2959 static const struct file_operations proc_modules_operations
= {
2960 .open
= modules_open
,
2962 .llseek
= seq_lseek
,
2963 .release
= seq_release
,
2966 static int __init
proc_modules_init(void)
2968 proc_create("modules", 0, NULL
, &proc_modules_operations
);
2971 module_init(proc_modules_init
);
2974 /* Given an address, look for it in the module exception tables. */
2975 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2977 const struct exception_table_entry
*e
= NULL
;
2981 list_for_each_entry_rcu(mod
, &modules
, list
) {
2982 if (mod
->num_exentries
== 0)
2985 e
= search_extable(mod
->extable
,
2986 mod
->extable
+ mod
->num_exentries
- 1,
2993 /* Now, if we found one, we are running inside it now, hence
2994 we cannot unload the module, hence no refcnt needed. */
2999 * is_module_address - is this address inside a module?
3000 * @addr: the address to check.
3002 * See is_module_text_address() if you simply want to see if the address
3003 * is code (not data).
3005 bool is_module_address(unsigned long addr
)
3010 ret
= __module_address(addr
) != NULL
;
3017 * __module_address - get the module which contains an address.
3018 * @addr: the address.
3020 * Must be called with preempt disabled or module mutex held so that
3021 * module doesn't get freed during this.
3023 struct module
*__module_address(unsigned long addr
)
3027 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3030 list_for_each_entry_rcu(mod
, &modules
, list
)
3031 if (within_module_core(addr
, mod
)
3032 || within_module_init(addr
, mod
))
3036 EXPORT_SYMBOL_GPL(__module_address
);
3039 * is_module_text_address - is this address inside module code?
3040 * @addr: the address to check.
3042 * See is_module_address() if you simply want to see if the address is
3043 * anywhere in a module. See kernel_text_address() for testing if an
3044 * address corresponds to kernel or module code.
3046 bool is_module_text_address(unsigned long addr
)
3051 ret
= __module_text_address(addr
) != NULL
;
3058 * __module_text_address - get the module whose code contains an address.
3059 * @addr: the address.
3061 * Must be called with preempt disabled or module mutex held so that
3062 * module doesn't get freed during this.
3064 struct module
*__module_text_address(unsigned long addr
)
3066 struct module
*mod
= __module_address(addr
);
3068 /* Make sure it's within the text section. */
3069 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3070 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3075 EXPORT_SYMBOL_GPL(__module_text_address
);
3077 /* Don't grab lock, we're oopsing. */
3078 void print_modules(void)
3083 printk(KERN_DEFAULT
"Modules linked in:");
3084 /* Most callers should already have preempt disabled, but make sure */
3086 list_for_each_entry_rcu(mod
, &modules
, list
)
3087 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3089 if (last_unloaded_module
[0])
3090 printk(" [last unloaded: %s]", last_unloaded_module
);
3094 #ifdef CONFIG_MODVERSIONS
3095 /* Generate the signature for all relevant module structures here.
3096 * If these change, we don't want to try to parse the module. */
3097 void module_layout(struct module
*mod
,
3098 struct modversion_info
*ver
,
3099 struct kernel_param
*kp
,
3100 struct kernel_symbol
*ks
,
3101 struct tracepoint
*tp
)
3104 EXPORT_SYMBOL(module_layout
);
3107 #ifdef CONFIG_TRACEPOINTS
3108 void module_update_tracepoints(void)
3112 mutex_lock(&module_mutex
);
3113 list_for_each_entry(mod
, &modules
, list
)
3115 tracepoint_update_probe_range(mod
->tracepoints
,
3116 mod
->tracepoints
+ mod
->num_tracepoints
);
3117 mutex_unlock(&module_mutex
);
3121 * Returns 0 if current not found.
3122 * Returns 1 if current found.
3124 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
3126 struct module
*iter_mod
;
3129 mutex_lock(&module_mutex
);
3130 list_for_each_entry(iter_mod
, &modules
, list
) {
3131 if (!iter_mod
->taints
) {
3133 * Sorted module list
3135 if (iter_mod
< iter
->module
)
3137 else if (iter_mod
> iter
->module
)
3138 iter
->tracepoint
= NULL
;
3139 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
3140 iter_mod
->tracepoints
,
3141 iter_mod
->tracepoints
3142 + iter_mod
->num_tracepoints
);
3144 iter
->module
= iter_mod
;
3149 mutex_unlock(&module_mutex
);