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
)
529 INIT_LIST_HEAD(&mod
->source_list
);
530 INIT_LIST_HEAD(&mod
->target_list
);
532 /* Hold reference count during initialization. */
533 __this_cpu_write(mod
->refptr
->incs
, 1);
534 /* Backwards compatibility macros put refcount during init. */
535 mod
->waiter
= current
;
538 /* Does a already use b? */
539 static int already_uses(struct module
*a
, struct module
*b
)
541 struct module_use
*use
;
543 list_for_each_entry(use
, &b
->source_list
, source_list
) {
544 if (use
->source
== a
) {
545 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
549 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
555 * - we add 'a' as a "source", 'b' as a "target" of module use
556 * - the module_use is added to the list of 'b' sources (so
557 * 'b' can walk the list to see who sourced them), and of 'a'
558 * targets (so 'a' can see what modules it targets).
560 static int add_module_usage(struct module
*a
, struct module
*b
)
562 struct module_use
*use
;
564 DEBUGP("Allocating new usage for %s.\n", a
->name
);
565 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
567 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
573 list_add(&use
->source_list
, &b
->source_list
);
574 list_add(&use
->target_list
, &a
->target_list
);
578 /* Module a uses b: caller needs module_mutex() */
579 int ref_module(struct module
*a
, struct module
*b
)
583 if (b
== NULL
|| already_uses(a
, b
))
586 /* If module isn't available, we fail. */
587 err
= strong_try_module_get(b
);
591 err
= add_module_usage(a
, b
);
598 EXPORT_SYMBOL_GPL(ref_module
);
600 /* Clear the unload stuff of the module. */
601 static void module_unload_free(struct module
*mod
)
603 struct module_use
*use
, *tmp
;
605 mutex_lock(&module_mutex
);
606 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
607 struct module
*i
= use
->target
;
608 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
610 list_del(&use
->source_list
);
611 list_del(&use
->target_list
);
614 mutex_unlock(&module_mutex
);
617 #ifdef CONFIG_MODULE_FORCE_UNLOAD
618 static inline int try_force_unload(unsigned int flags
)
620 int ret
= (flags
& O_TRUNC
);
622 add_taint(TAINT_FORCED_RMMOD
);
626 static inline int try_force_unload(unsigned int flags
)
630 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
639 /* Whole machine is stopped with interrupts off when this runs. */
640 static int __try_stop_module(void *_sref
)
642 struct stopref
*sref
= _sref
;
644 /* If it's not unused, quit unless we're forcing. */
645 if (module_refcount(sref
->mod
) != 0) {
646 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
650 /* Mark it as dying. */
651 sref
->mod
->state
= MODULE_STATE_GOING
;
655 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
657 if (flags
& O_NONBLOCK
) {
658 struct stopref sref
= { mod
, flags
, forced
};
660 return stop_machine(__try_stop_module
, &sref
, NULL
);
662 /* We don't need to stop the machine for this. */
663 mod
->state
= MODULE_STATE_GOING
;
669 unsigned int module_refcount(struct module
*mod
)
671 unsigned int incs
= 0, decs
= 0;
674 for_each_possible_cpu(cpu
)
675 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
677 * ensure the incs are added up after the decs.
678 * module_put ensures incs are visible before decs with smp_wmb.
680 * This 2-count scheme avoids the situation where the refcount
681 * for CPU0 is read, then CPU0 increments the module refcount,
682 * then CPU1 drops that refcount, then the refcount for CPU1 is
683 * read. We would record a decrement but not its corresponding
684 * increment so we would see a low count (disaster).
686 * Rare situation? But module_refcount can be preempted, and we
687 * might be tallying up 4096+ CPUs. So it is not impossible.
690 for_each_possible_cpu(cpu
)
691 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
694 EXPORT_SYMBOL(module_refcount
);
696 /* This exists whether we can unload or not */
697 static void free_module(struct module
*mod
);
699 static void wait_for_zero_refcount(struct module
*mod
)
701 /* Since we might sleep for some time, release the mutex first */
702 mutex_unlock(&module_mutex
);
704 DEBUGP("Looking at refcount...\n");
705 set_current_state(TASK_UNINTERRUPTIBLE
);
706 if (module_refcount(mod
) == 0)
710 current
->state
= TASK_RUNNING
;
711 mutex_lock(&module_mutex
);
714 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
718 char name
[MODULE_NAME_LEN
];
721 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
724 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
726 name
[MODULE_NAME_LEN
-1] = '\0';
728 if (mutex_lock_interruptible(&module_mutex
) != 0)
731 mod
= find_module(name
);
737 if (!list_empty(&mod
->source_list
)) {
738 /* Other modules depend on us: get rid of them first. */
743 /* Doing init or already dying? */
744 if (mod
->state
!= MODULE_STATE_LIVE
) {
745 /* FIXME: if (force), slam module count and wake up
747 DEBUGP("%s already dying\n", mod
->name
);
752 /* If it has an init func, it must have an exit func to unload */
753 if (mod
->init
&& !mod
->exit
) {
754 forced
= try_force_unload(flags
);
756 /* This module can't be removed */
762 /* Set this up before setting mod->state */
763 mod
->waiter
= current
;
765 /* Stop the machine so refcounts can't move and disable module. */
766 ret
= try_stop_module(mod
, flags
, &forced
);
770 /* Never wait if forced. */
771 if (!forced
&& module_refcount(mod
) != 0)
772 wait_for_zero_refcount(mod
);
774 mutex_unlock(&module_mutex
);
775 /* Final destruction now noone is using it. */
776 if (mod
->exit
!= NULL
)
778 blocking_notifier_call_chain(&module_notify_list
,
779 MODULE_STATE_GOING
, mod
);
780 async_synchronize_full();
782 /* Store the name of the last unloaded module for diagnostic purposes */
783 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
788 mutex_unlock(&module_mutex
);
792 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
794 struct module_use
*use
;
795 int printed_something
= 0;
797 seq_printf(m
, " %u ", module_refcount(mod
));
799 /* Always include a trailing , so userspace can differentiate
800 between this and the old multi-field proc format. */
801 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
802 printed_something
= 1;
803 seq_printf(m
, "%s,", use
->source
->name
);
806 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
807 printed_something
= 1;
808 seq_printf(m
, "[permanent],");
811 if (!printed_something
)
815 void __symbol_put(const char *symbol
)
817 struct module
*owner
;
820 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
825 EXPORT_SYMBOL(__symbol_put
);
827 /* Note this assumes addr is a function, which it currently always is. */
828 void symbol_put_addr(void *addr
)
830 struct module
*modaddr
;
831 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
833 if (core_kernel_text(a
))
836 /* module_text_address is safe here: we're supposed to have reference
837 * to module from symbol_get, so it can't go away. */
838 modaddr
= __module_text_address(a
);
842 EXPORT_SYMBOL_GPL(symbol_put_addr
);
844 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
845 struct module
*mod
, char *buffer
)
847 return sprintf(buffer
, "%u\n", module_refcount(mod
));
850 static struct module_attribute refcnt
= {
851 .attr
= { .name
= "refcnt", .mode
= 0444 },
855 void module_put(struct module
*module
)
859 smp_wmb(); /* see comment in module_refcount */
860 __this_cpu_inc(module
->refptr
->decs
);
862 trace_module_put(module
, _RET_IP_
);
863 /* Maybe they're waiting for us to drop reference? */
864 if (unlikely(!module_is_live(module
)))
865 wake_up_process(module
->waiter
);
869 EXPORT_SYMBOL(module_put
);
871 #else /* !CONFIG_MODULE_UNLOAD */
872 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
874 /* We don't know the usage count, or what modules are using. */
875 seq_printf(m
, " - -");
878 static inline void module_unload_free(struct module
*mod
)
882 int ref_module(struct module
*a
, struct module
*b
)
884 return strong_try_module_get(b
);
886 EXPORT_SYMBOL_GPL(ref_module
);
888 static inline void module_unload_init(struct module
*mod
)
891 #endif /* CONFIG_MODULE_UNLOAD */
893 static ssize_t
show_initstate(struct module_attribute
*mattr
,
894 struct module
*mod
, char *buffer
)
896 const char *state
= "unknown";
898 switch (mod
->state
) {
899 case MODULE_STATE_LIVE
:
902 case MODULE_STATE_COMING
:
905 case MODULE_STATE_GOING
:
909 return sprintf(buffer
, "%s\n", state
);
912 static struct module_attribute initstate
= {
913 .attr
= { .name
= "initstate", .mode
= 0444 },
914 .show
= show_initstate
,
917 static struct module_attribute
*modinfo_attrs
[] = {
921 #ifdef CONFIG_MODULE_UNLOAD
927 static const char vermagic
[] = VERMAGIC_STRING
;
929 static int try_to_force_load(struct module
*mod
, const char *reason
)
931 #ifdef CONFIG_MODULE_FORCE_LOAD
932 if (!test_taint(TAINT_FORCED_MODULE
))
933 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
935 add_taint_module(mod
, TAINT_FORCED_MODULE
);
942 #ifdef CONFIG_MODVERSIONS
943 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
944 static unsigned long maybe_relocated(unsigned long crc
,
945 const struct module
*crc_owner
)
947 #ifdef ARCH_RELOCATES_KCRCTAB
948 if (crc_owner
== NULL
)
949 return crc
- (unsigned long)reloc_start
;
954 static int check_version(Elf_Shdr
*sechdrs
,
955 unsigned int versindex
,
958 const unsigned long *crc
,
959 const struct module
*crc_owner
)
961 unsigned int i
, num_versions
;
962 struct modversion_info
*versions
;
964 /* Exporting module didn't supply crcs? OK, we're already tainted. */
968 /* No versions at all? modprobe --force does this. */
970 return try_to_force_load(mod
, symname
) == 0;
972 versions
= (void *) sechdrs
[versindex
].sh_addr
;
973 num_versions
= sechdrs
[versindex
].sh_size
974 / sizeof(struct modversion_info
);
976 for (i
= 0; i
< num_versions
; i
++) {
977 if (strcmp(versions
[i
].name
, symname
) != 0)
980 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
982 DEBUGP("Found checksum %lX vs module %lX\n",
983 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
987 printk(KERN_WARNING
"%s: no symbol version for %s\n",
992 printk("%s: disagrees about version of symbol %s\n",
997 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
998 unsigned int versindex
,
1001 const unsigned long *crc
;
1003 /* Since this should be found in kernel (which can't be removed),
1004 * no locking is necessary. */
1005 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1008 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1012 /* First part is kernel version, which we ignore if module has crcs. */
1013 static inline int same_magic(const char *amagic
, const char *bmagic
,
1017 amagic
+= strcspn(amagic
, " ");
1018 bmagic
+= strcspn(bmagic
, " ");
1020 return strcmp(amagic
, bmagic
) == 0;
1023 static inline int check_version(Elf_Shdr
*sechdrs
,
1024 unsigned int versindex
,
1025 const char *symname
,
1027 const unsigned long *crc
,
1028 const struct module
*crc_owner
)
1033 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1034 unsigned int versindex
,
1040 static inline int same_magic(const char *amagic
, const char *bmagic
,
1043 return strcmp(amagic
, bmagic
) == 0;
1045 #endif /* CONFIG_MODVERSIONS */
1047 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1048 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1049 unsigned int versindex
,
1054 struct module
*owner
;
1055 const struct kernel_symbol
*sym
;
1056 const unsigned long *crc
;
1059 mutex_lock(&module_mutex
);
1060 sym
= find_symbol(name
, &owner
, &crc
,
1061 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1065 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
, owner
)) {
1066 sym
= ERR_PTR(-EINVAL
);
1070 err
= ref_module(mod
, owner
);
1077 /* We must make copy under the lock if we failed to get ref. */
1078 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1080 mutex_unlock(&module_mutex
);
1084 static const struct kernel_symbol
*resolve_symbol_wait(Elf_Shdr
*sechdrs
,
1085 unsigned int versindex
,
1089 const struct kernel_symbol
*ksym
;
1090 char ownername
[MODULE_NAME_LEN
];
1092 if (wait_event_interruptible_timeout(module_wq
,
1093 !IS_ERR(ksym
= resolve_symbol(sechdrs
, versindex
, name
,
1095 PTR_ERR(ksym
) != -EBUSY
,
1097 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1098 mod
->name
, ownername
);
1104 * /sys/module/foo/sections stuff
1105 * J. Corbet <corbet@lwn.net>
1107 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1109 static inline bool sect_empty(const Elf_Shdr
*sect
)
1111 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1114 struct module_sect_attr
1116 struct module_attribute mattr
;
1118 unsigned long address
;
1121 struct module_sect_attrs
1123 struct attribute_group grp
;
1124 unsigned int nsections
;
1125 struct module_sect_attr attrs
[0];
1128 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1129 struct module
*mod
, char *buf
)
1131 struct module_sect_attr
*sattr
=
1132 container_of(mattr
, struct module_sect_attr
, mattr
);
1133 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1136 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1138 unsigned int section
;
1140 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1141 kfree(sect_attrs
->attrs
[section
].name
);
1145 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1146 char *secstrings
, Elf_Shdr
*sechdrs
)
1148 unsigned int nloaded
= 0, i
, size
[2];
1149 struct module_sect_attrs
*sect_attrs
;
1150 struct module_sect_attr
*sattr
;
1151 struct attribute
**gattr
;
1153 /* Count loaded sections and allocate structures */
1154 for (i
= 0; i
< nsect
; i
++)
1155 if (!sect_empty(&sechdrs
[i
]))
1157 size
[0] = ALIGN(sizeof(*sect_attrs
)
1158 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1159 sizeof(sect_attrs
->grp
.attrs
[0]));
1160 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1161 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1162 if (sect_attrs
== NULL
)
1165 /* Setup section attributes. */
1166 sect_attrs
->grp
.name
= "sections";
1167 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1169 sect_attrs
->nsections
= 0;
1170 sattr
= §_attrs
->attrs
[0];
1171 gattr
= §_attrs
->grp
.attrs
[0];
1172 for (i
= 0; i
< nsect
; i
++) {
1173 if (sect_empty(&sechdrs
[i
]))
1175 sattr
->address
= sechdrs
[i
].sh_addr
;
1176 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1178 if (sattr
->name
== NULL
)
1180 sect_attrs
->nsections
++;
1181 sysfs_attr_init(&sattr
->mattr
.attr
);
1182 sattr
->mattr
.show
= module_sect_show
;
1183 sattr
->mattr
.store
= NULL
;
1184 sattr
->mattr
.attr
.name
= sattr
->name
;
1185 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1186 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1190 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1193 mod
->sect_attrs
= sect_attrs
;
1196 free_sect_attrs(sect_attrs
);
1199 static void remove_sect_attrs(struct module
*mod
)
1201 if (mod
->sect_attrs
) {
1202 sysfs_remove_group(&mod
->mkobj
.kobj
,
1203 &mod
->sect_attrs
->grp
);
1204 /* We are positive that no one is using any sect attrs
1205 * at this point. Deallocate immediately. */
1206 free_sect_attrs(mod
->sect_attrs
);
1207 mod
->sect_attrs
= NULL
;
1212 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1215 struct module_notes_attrs
{
1216 struct kobject
*dir
;
1218 struct bin_attribute attrs
[0];
1221 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1222 struct bin_attribute
*bin_attr
,
1223 char *buf
, loff_t pos
, size_t count
)
1226 * The caller checked the pos and count against our size.
1228 memcpy(buf
, bin_attr
->private + pos
, count
);
1232 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1235 if (notes_attrs
->dir
) {
1237 sysfs_remove_bin_file(notes_attrs
->dir
,
1238 ¬es_attrs
->attrs
[i
]);
1239 kobject_put(notes_attrs
->dir
);
1244 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1245 char *secstrings
, Elf_Shdr
*sechdrs
)
1247 unsigned int notes
, loaded
, i
;
1248 struct module_notes_attrs
*notes_attrs
;
1249 struct bin_attribute
*nattr
;
1251 /* failed to create section attributes, so can't create notes */
1252 if (!mod
->sect_attrs
)
1255 /* Count notes sections and allocate structures. */
1257 for (i
= 0; i
< nsect
; i
++)
1258 if (!sect_empty(&sechdrs
[i
]) &&
1259 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1265 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1266 + notes
* sizeof(notes_attrs
->attrs
[0]),
1268 if (notes_attrs
== NULL
)
1271 notes_attrs
->notes
= notes
;
1272 nattr
= ¬es_attrs
->attrs
[0];
1273 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1274 if (sect_empty(&sechdrs
[i
]))
1276 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1277 sysfs_bin_attr_init(nattr
);
1278 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1279 nattr
->attr
.mode
= S_IRUGO
;
1280 nattr
->size
= sechdrs
[i
].sh_size
;
1281 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1282 nattr
->read
= module_notes_read
;
1288 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1289 if (!notes_attrs
->dir
)
1292 for (i
= 0; i
< notes
; ++i
)
1293 if (sysfs_create_bin_file(notes_attrs
->dir
,
1294 ¬es_attrs
->attrs
[i
]))
1297 mod
->notes_attrs
= notes_attrs
;
1301 free_notes_attrs(notes_attrs
, i
);
1304 static void remove_notes_attrs(struct module
*mod
)
1306 if (mod
->notes_attrs
)
1307 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1312 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1313 char *sectstrings
, Elf_Shdr
*sechdrs
)
1317 static inline void remove_sect_attrs(struct module
*mod
)
1321 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1322 char *sectstrings
, Elf_Shdr
*sechdrs
)
1326 static inline void remove_notes_attrs(struct module
*mod
)
1332 static void add_usage_links(struct module
*mod
)
1334 #ifdef CONFIG_MODULE_UNLOAD
1335 struct module_use
*use
;
1338 mutex_lock(&module_mutex
);
1339 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1340 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1341 &mod
->mkobj
.kobj
, mod
->name
);
1343 mutex_unlock(&module_mutex
);
1347 static void del_usage_links(struct module
*mod
)
1349 #ifdef CONFIG_MODULE_UNLOAD
1350 struct module_use
*use
;
1352 mutex_lock(&module_mutex
);
1353 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1354 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1355 mutex_unlock(&module_mutex
);
1359 static int module_add_modinfo_attrs(struct module
*mod
)
1361 struct module_attribute
*attr
;
1362 struct module_attribute
*temp_attr
;
1366 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1367 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1369 if (!mod
->modinfo_attrs
)
1372 temp_attr
= mod
->modinfo_attrs
;
1373 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1375 (attr
->test
&& attr
->test(mod
))) {
1376 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1377 sysfs_attr_init(&temp_attr
->attr
);
1378 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1385 static void module_remove_modinfo_attrs(struct module
*mod
)
1387 struct module_attribute
*attr
;
1390 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1391 /* pick a field to test for end of list */
1392 if (!attr
->attr
.name
)
1394 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1398 kfree(mod
->modinfo_attrs
);
1401 static int mod_sysfs_init(struct module
*mod
)
1404 struct kobject
*kobj
;
1406 if (!module_sysfs_initialized
) {
1407 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1413 kobj
= kset_find_obj(module_kset
, mod
->name
);
1415 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1421 mod
->mkobj
.mod
= mod
;
1423 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1424 mod
->mkobj
.kobj
.kset
= module_kset
;
1425 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1428 kobject_put(&mod
->mkobj
.kobj
);
1430 /* delay uevent until full sysfs population */
1435 static int mod_sysfs_setup(struct module
*mod
,
1436 struct kernel_param
*kparam
,
1437 unsigned int num_params
)
1441 err
= mod_sysfs_init(mod
);
1445 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1446 if (!mod
->holders_dir
) {
1451 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1453 goto out_unreg_holders
;
1455 err
= module_add_modinfo_attrs(mod
);
1457 goto out_unreg_param
;
1459 add_usage_links(mod
);
1461 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1465 module_param_sysfs_remove(mod
);
1467 kobject_put(mod
->holders_dir
);
1469 kobject_put(&mod
->mkobj
.kobj
);
1474 static void mod_sysfs_fini(struct module
*mod
)
1476 kobject_put(&mod
->mkobj
.kobj
);
1479 #else /* CONFIG_SYSFS */
1481 static inline int mod_sysfs_init(struct module
*mod
)
1486 static inline int mod_sysfs_setup(struct module
*mod
,
1487 struct kernel_param
*kparam
,
1488 unsigned int num_params
)
1493 static inline int module_add_modinfo_attrs(struct module
*mod
)
1498 static inline void module_remove_modinfo_attrs(struct module
*mod
)
1502 static void mod_sysfs_fini(struct module
*mod
)
1506 static void del_usage_links(struct module
*mod
)
1510 #endif /* CONFIG_SYSFS */
1512 static void mod_kobject_remove(struct module
*mod
)
1514 del_usage_links(mod
);
1515 module_remove_modinfo_attrs(mod
);
1516 module_param_sysfs_remove(mod
);
1517 kobject_put(mod
->mkobj
.drivers_dir
);
1518 kobject_put(mod
->holders_dir
);
1519 mod_sysfs_fini(mod
);
1523 * unlink the module with the whole machine is stopped with interrupts off
1524 * - this defends against kallsyms not taking locks
1526 static int __unlink_module(void *_mod
)
1528 struct module
*mod
= _mod
;
1529 list_del(&mod
->list
);
1533 /* Free a module, remove from lists, etc. */
1534 static void free_module(struct module
*mod
)
1536 trace_module_free(mod
);
1538 /* Delete from various lists */
1539 mutex_lock(&module_mutex
);
1540 stop_machine(__unlink_module
, mod
, NULL
);
1541 mutex_unlock(&module_mutex
);
1542 remove_notes_attrs(mod
);
1543 remove_sect_attrs(mod
);
1544 mod_kobject_remove(mod
);
1546 /* Remove dynamic debug info */
1547 ddebug_remove_module(mod
->name
);
1549 /* Arch-specific cleanup. */
1550 module_arch_cleanup(mod
);
1552 /* Module unload stuff */
1553 module_unload_free(mod
);
1555 /* Free any allocated parameters. */
1556 destroy_params(mod
->kp
, mod
->num_kp
);
1558 /* This may be NULL, but that's OK */
1559 module_free(mod
, mod
->module_init
);
1561 percpu_modfree(mod
);
1562 #if defined(CONFIG_MODULE_UNLOAD)
1564 free_percpu(mod
->refptr
);
1566 /* Free lock-classes: */
1567 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1569 /* Finally, free the core (containing the module structure) */
1570 module_free(mod
, mod
->module_core
);
1573 update_protections(current
->mm
);
1577 void *__symbol_get(const char *symbol
)
1579 struct module
*owner
;
1580 const struct kernel_symbol
*sym
;
1583 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1584 if (sym
&& strong_try_module_get(owner
))
1588 return sym
? (void *)sym
->value
: NULL
;
1590 EXPORT_SYMBOL_GPL(__symbol_get
);
1593 * Ensure that an exported symbol [global namespace] does not already exist
1594 * in the kernel or in some other module's exported symbol table.
1596 * You must hold the module_mutex.
1598 static int verify_export_symbols(struct module
*mod
)
1601 struct module
*owner
;
1602 const struct kernel_symbol
*s
;
1604 const struct kernel_symbol
*sym
;
1607 { mod
->syms
, mod
->num_syms
},
1608 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1609 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1610 #ifdef CONFIG_UNUSED_SYMBOLS
1611 { mod
->unused_syms
, mod
->num_unused_syms
},
1612 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1616 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1617 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1618 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1620 "%s: exports duplicate symbol %s"
1622 mod
->name
, s
->name
, module_name(owner
));
1630 /* Change all symbols so that st_value encodes the pointer directly. */
1631 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1632 unsigned int symindex
,
1634 unsigned int versindex
,
1635 unsigned int pcpuindex
,
1638 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1639 unsigned long secbase
;
1640 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1642 const struct kernel_symbol
*ksym
;
1644 for (i
= 1; i
< n
; i
++) {
1645 switch (sym
[i
].st_shndx
) {
1647 /* We compiled with -fno-common. These are not
1648 supposed to happen. */
1649 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1650 printk("%s: please compile with -fno-common\n",
1656 /* Don't need to do anything */
1657 DEBUGP("Absolute symbol: 0x%08lx\n",
1658 (long)sym
[i
].st_value
);
1662 ksym
= resolve_symbol_wait(sechdrs
, versindex
,
1663 strtab
+ sym
[i
].st_name
,
1665 /* Ok if resolved. */
1666 if (ksym
&& !IS_ERR(ksym
)) {
1667 sym
[i
].st_value
= ksym
->value
;
1672 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1675 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
1676 mod
->name
, strtab
+ sym
[i
].st_name
,
1678 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
1682 /* Divert to percpu allocation if a percpu var. */
1683 if (sym
[i
].st_shndx
== pcpuindex
)
1684 secbase
= (unsigned long)mod_percpu(mod
);
1686 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1687 sym
[i
].st_value
+= secbase
;
1695 /* Additional bytes needed by arch in front of individual sections */
1696 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1697 unsigned int section
)
1699 /* default implementation just returns zero */
1703 /* Update size with this section: return offset. */
1704 static long get_offset(struct module
*mod
, unsigned int *size
,
1705 Elf_Shdr
*sechdr
, unsigned int section
)
1709 *size
+= arch_mod_section_prepend(mod
, section
);
1710 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1711 *size
= ret
+ sechdr
->sh_size
;
1715 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1716 might -- code, read-only data, read-write data, small data. Tally
1717 sizes, and place the offsets into sh_entsize fields: high bit means it
1719 static void layout_sections(struct module
*mod
,
1720 const Elf_Ehdr
*hdr
,
1722 const char *secstrings
)
1724 static unsigned long const masks
[][2] = {
1725 /* NOTE: all executable code must be the first section
1726 * in this array; otherwise modify the text_size
1727 * finder in the two loops below */
1728 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1729 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1730 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1731 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1735 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1736 sechdrs
[i
].sh_entsize
= ~0UL;
1738 DEBUGP("Core section allocation order:\n");
1739 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1740 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1741 Elf_Shdr
*s
= &sechdrs
[i
];
1743 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1744 || (s
->sh_flags
& masks
[m
][1])
1745 || s
->sh_entsize
!= ~0UL
1746 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1748 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1749 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1752 mod
->core_text_size
= mod
->core_size
;
1755 DEBUGP("Init section allocation order:\n");
1756 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1757 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1758 Elf_Shdr
*s
= &sechdrs
[i
];
1760 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1761 || (s
->sh_flags
& masks
[m
][1])
1762 || s
->sh_entsize
!= ~0UL
1763 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1765 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1766 | INIT_OFFSET_MASK
);
1767 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1770 mod
->init_text_size
= mod
->init_size
;
1774 static void set_license(struct module
*mod
, const char *license
)
1777 license
= "unspecified";
1779 if (!license_is_gpl_compatible(license
)) {
1780 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1781 printk(KERN_WARNING
"%s: module license '%s' taints "
1782 "kernel.\n", mod
->name
, license
);
1783 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1787 /* Parse tag=value strings from .modinfo section */
1788 static char *next_string(char *string
, unsigned long *secsize
)
1790 /* Skip non-zero chars */
1793 if ((*secsize
)-- <= 1)
1797 /* Skip any zero padding. */
1798 while (!string
[0]) {
1800 if ((*secsize
)-- <= 1)
1806 static char *get_modinfo(const Elf_Shdr
*sechdrs
,
1811 unsigned int taglen
= strlen(tag
);
1812 unsigned long size
= sechdrs
[info
].sh_size
;
1814 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1815 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1816 return p
+ taglen
+ 1;
1821 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1822 unsigned int infoindex
)
1824 struct module_attribute
*attr
;
1827 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1830 get_modinfo(sechdrs
,
1836 static void free_modinfo(struct module
*mod
)
1838 struct module_attribute
*attr
;
1841 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1847 #ifdef CONFIG_KALLSYMS
1849 /* lookup symbol in given range of kernel_symbols */
1850 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1851 const struct kernel_symbol
*start
,
1852 const struct kernel_symbol
*stop
)
1854 const struct kernel_symbol
*ks
= start
;
1855 for (; ks
< stop
; ks
++)
1856 if (strcmp(ks
->name
, name
) == 0)
1861 static int is_exported(const char *name
, unsigned long value
,
1862 const struct module
*mod
)
1864 const struct kernel_symbol
*ks
;
1866 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1868 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1869 return ks
!= NULL
&& ks
->value
== value
;
1873 static char elf_type(const Elf_Sym
*sym
,
1875 const char *secstrings
,
1878 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1879 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1884 if (sym
->st_shndx
== SHN_UNDEF
)
1886 if (sym
->st_shndx
== SHN_ABS
)
1888 if (sym
->st_shndx
>= SHN_LORESERVE
)
1890 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1892 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1893 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1894 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1896 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1901 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1902 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1907 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1912 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
1915 const Elf_Shdr
*sec
;
1917 if (src
->st_shndx
== SHN_UNDEF
1918 || src
->st_shndx
>= shnum
1922 sec
= sechdrs
+ src
->st_shndx
;
1923 if (!(sec
->sh_flags
& SHF_ALLOC
)
1924 #ifndef CONFIG_KALLSYMS_ALL
1925 || !(sec
->sh_flags
& SHF_EXECINSTR
)
1927 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
1933 static unsigned long layout_symtab(struct module
*mod
,
1935 unsigned int symindex
,
1936 unsigned int strindex
,
1937 const Elf_Ehdr
*hdr
,
1938 const char *secstrings
,
1939 unsigned long *pstroffs
,
1940 unsigned long *strmap
)
1942 unsigned long symoffs
;
1943 Elf_Shdr
*symsect
= sechdrs
+ symindex
;
1944 Elf_Shdr
*strsect
= sechdrs
+ strindex
;
1947 unsigned int i
, nsrc
, ndst
;
1949 /* Put symbol section at end of init part of module. */
1950 symsect
->sh_flags
|= SHF_ALLOC
;
1951 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
1952 symindex
) | INIT_OFFSET_MASK
;
1953 DEBUGP("\t%s\n", secstrings
+ symsect
->sh_name
);
1955 src
= (void *)hdr
+ symsect
->sh_offset
;
1956 nsrc
= symsect
->sh_size
/ sizeof(*src
);
1957 strtab
= (void *)hdr
+ strsect
->sh_offset
;
1958 for (ndst
= i
= 1; i
< nsrc
; ++i
, ++src
)
1959 if (is_core_symbol(src
, sechdrs
, hdr
->e_shnum
)) {
1960 unsigned int j
= src
->st_name
;
1962 while(!__test_and_set_bit(j
, strmap
) && strtab
[j
])
1967 /* Append room for core symbols at end of core part. */
1968 symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
1969 mod
->core_size
= symoffs
+ ndst
* sizeof(Elf_Sym
);
1971 /* Put string table section at end of init part of module. */
1972 strsect
->sh_flags
|= SHF_ALLOC
;
1973 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
1974 strindex
) | INIT_OFFSET_MASK
;
1975 DEBUGP("\t%s\n", secstrings
+ strsect
->sh_name
);
1977 /* Append room for core symbols' strings at end of core part. */
1978 *pstroffs
= mod
->core_size
;
1979 __set_bit(0, strmap
);
1980 mod
->core_size
+= bitmap_weight(strmap
, strsect
->sh_size
);
1985 static void add_kallsyms(struct module
*mod
,
1988 unsigned int symindex
,
1989 unsigned int strindex
,
1990 unsigned long symoffs
,
1991 unsigned long stroffs
,
1992 const char *secstrings
,
1993 unsigned long *strmap
)
1995 unsigned int i
, ndst
;
2000 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
2001 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
2002 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
2004 /* Set types up while we still have access to sections. */
2005 for (i
= 0; i
< mod
->num_symtab
; i
++)
2006 mod
->symtab
[i
].st_info
2007 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
2009 mod
->core_symtab
= dst
= mod
->module_core
+ symoffs
;
2012 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
2013 if (!is_core_symbol(src
, sechdrs
, shnum
))
2016 dst
[ndst
].st_name
= bitmap_weight(strmap
, dst
[ndst
].st_name
);
2019 mod
->core_num_syms
= ndst
;
2021 mod
->core_strtab
= s
= mod
->module_core
+ stroffs
;
2022 for (*s
= 0, i
= 1; i
< sechdrs
[strindex
].sh_size
; ++i
)
2023 if (test_bit(i
, strmap
))
2024 *++s
= mod
->strtab
[i
];
2027 static inline unsigned long layout_symtab(struct module
*mod
,
2029 unsigned int symindex
,
2030 unsigned int strindex
,
2031 const Elf_Ehdr
*hdr
,
2032 const char *secstrings
,
2033 unsigned long *pstroffs
,
2034 unsigned long *strmap
)
2039 static inline void add_kallsyms(struct module
*mod
,
2042 unsigned int symindex
,
2043 unsigned int strindex
,
2044 unsigned long symoffs
,
2045 unsigned long stroffs
,
2046 const char *secstrings
,
2047 const unsigned long *strmap
)
2050 #endif /* CONFIG_KALLSYMS */
2052 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2054 #ifdef CONFIG_DYNAMIC_DEBUG
2055 if (ddebug_add_module(debug
, num
, debug
->modname
))
2056 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2061 static void dynamic_debug_remove(struct _ddebug
*debug
)
2064 ddebug_remove_module(debug
->modname
);
2067 static void *module_alloc_update_bounds(unsigned long size
)
2069 void *ret
= module_alloc(size
);
2072 mutex_lock(&module_mutex
);
2073 /* Update module bounds. */
2074 if ((unsigned long)ret
< module_addr_min
)
2075 module_addr_min
= (unsigned long)ret
;
2076 if ((unsigned long)ret
+ size
> module_addr_max
)
2077 module_addr_max
= (unsigned long)ret
+ size
;
2078 mutex_unlock(&module_mutex
);
2083 #ifdef CONFIG_DEBUG_KMEMLEAK
2084 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2085 const Elf_Shdr
*sechdrs
,
2086 const char *secstrings
)
2090 /* only scan the sections containing data */
2091 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2093 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2094 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2096 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
2097 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
2100 kmemleak_scan_area((void *)sechdrs
[i
].sh_addr
,
2101 sechdrs
[i
].sh_size
, GFP_KERNEL
);
2105 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2107 const char *secstrings
)
2112 static int copy_and_check(Elf_Ehdr
**hdrp
,
2113 const void __user
*umod
, unsigned long len
)
2118 if (len
< sizeof(*hdr
))
2121 /* Suck in entire file: we'll want most of it. */
2122 /* vmalloc barfs on "unusual" numbers. Check here */
2123 if (len
> 64 * 1024 * 1024 || (hdr
= *hdrp
= vmalloc(len
)) == NULL
)
2126 if (copy_from_user(hdr
, umod
, len
) != 0) {
2131 /* Sanity checks against insmoding binaries or wrong arch,
2132 weird elf version */
2133 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2134 || hdr
->e_type
!= ET_REL
2135 || !elf_check_arch(hdr
)
2136 || hdr
->e_shentsize
!= sizeof(Elf_Shdr
)) {
2141 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
)) {
2152 static int check_modinfo(struct module
*mod
,
2153 const Elf_Shdr
*sechdrs
,
2154 unsigned int infoindex
, unsigned int versindex
)
2156 const char *modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2159 /* This is allowed: modprobe --force will invalidate it. */
2161 err
= try_to_force_load(mod
, "bad vermagic");
2164 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2165 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2166 mod
->name
, modmagic
, vermagic
);
2170 if (get_modinfo(sechdrs
, infoindex
, "staging")) {
2171 add_taint_module(mod
, TAINT_CRAP
);
2172 printk(KERN_WARNING
"%s: module is from the staging directory,"
2173 " the quality is unknown, you have been warned.\n",
2179 static void find_module_sections(struct module
*mod
, Elf_Ehdr
*hdr
,
2180 Elf_Shdr
*sechdrs
, const char *secstrings
)
2182 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2183 sizeof(*mod
->kp
), &mod
->num_kp
);
2184 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2185 sizeof(*mod
->syms
), &mod
->num_syms
);
2186 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2187 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2188 sizeof(*mod
->gpl_syms
),
2189 &mod
->num_gpl_syms
);
2190 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2191 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2192 "__ksymtab_gpl_future",
2193 sizeof(*mod
->gpl_future_syms
),
2194 &mod
->num_gpl_future_syms
);
2195 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2196 "__kcrctab_gpl_future");
2198 #ifdef CONFIG_UNUSED_SYMBOLS
2199 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2201 sizeof(*mod
->unused_syms
),
2202 &mod
->num_unused_syms
);
2203 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2204 "__kcrctab_unused");
2205 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2206 "__ksymtab_unused_gpl",
2207 sizeof(*mod
->unused_gpl_syms
),
2208 &mod
->num_unused_gpl_syms
);
2209 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2210 "__kcrctab_unused_gpl");
2212 #ifdef CONFIG_CONSTRUCTORS
2213 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2214 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2217 #ifdef CONFIG_TRACEPOINTS
2218 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2220 sizeof(*mod
->tracepoints
),
2221 &mod
->num_tracepoints
);
2223 #ifdef CONFIG_EVENT_TRACING
2224 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2226 sizeof(*mod
->trace_events
),
2227 &mod
->num_trace_events
);
2229 * This section contains pointers to allocated objects in the trace
2230 * code and not scanning it leads to false positives.
2232 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2233 mod
->num_trace_events
, GFP_KERNEL
);
2235 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2236 /* sechdrs[0].sh_size is always zero */
2237 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2239 sizeof(*mod
->ftrace_callsites
),
2240 &mod
->num_ftrace_callsites
);
2244 static struct module
*move_module(struct module
*mod
,
2245 Elf_Ehdr
*hdr
, Elf_Shdr
*sechdrs
,
2246 const char *secstrings
, unsigned modindex
)
2251 /* Do the allocs. */
2252 ptr
= module_alloc_update_bounds(mod
->core_size
);
2254 * The pointer to this block is stored in the module structure
2255 * which is inside the block. Just mark it as not being a
2258 kmemleak_not_leak(ptr
);
2260 return ERR_PTR(-ENOMEM
);
2262 memset(ptr
, 0, mod
->core_size
);
2263 mod
->module_core
= ptr
;
2265 ptr
= module_alloc_update_bounds(mod
->init_size
);
2267 * The pointer to this block is stored in the module structure
2268 * which is inside the block. This block doesn't need to be
2269 * scanned as it contains data and code that will be freed
2270 * after the module is initialized.
2272 kmemleak_ignore(ptr
);
2273 if (!ptr
&& mod
->init_size
) {
2274 module_free(mod
, mod
->module_core
);
2275 return ERR_PTR(-ENOMEM
);
2277 memset(ptr
, 0, mod
->init_size
);
2278 mod
->module_init
= ptr
;
2280 /* Transfer each section which specifies SHF_ALLOC */
2281 DEBUGP("final section addresses:\n");
2282 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2285 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2288 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2289 dest
= mod
->module_init
2290 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2292 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2294 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2295 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2296 sechdrs
[i
].sh_size
);
2297 /* Update sh_addr to point to copy in image. */
2298 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2299 DEBUGP("\t0x%lx %s\n",
2300 sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2302 /* Module has been moved. */
2303 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2304 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2308 /* Allocate and load the module: note that size of section 0 is always
2309 zero, and we rely on this for optional sections. */
2310 static noinline
struct module
*load_module(void __user
*umod
,
2312 const char __user
*uargs
)
2316 char *secstrings
, *args
, *strtab
= NULL
;
2318 unsigned int symindex
= 0;
2319 unsigned int strindex
= 0;
2320 unsigned int modindex
, versindex
, infoindex
, pcpuindex
;
2323 unsigned long symoffs
, stroffs
, *strmap
;
2324 void __percpu
*percpu
;
2325 struct _ddebug
*debug
= NULL
;
2326 unsigned int num_debug
= 0;
2328 mm_segment_t old_fs
;
2330 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2333 err
= copy_and_check(&hdr
, umod
, len
);
2335 return ERR_PTR(err
);
2337 /* Convenience variables */
2338 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
2339 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
2340 sechdrs
[0].sh_addr
= 0;
2342 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2343 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
2344 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
2347 /* Mark all sections sh_addr with their address in the
2349 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
2351 /* Internal symbols and strings. */
2352 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2354 strindex
= sechdrs
[i
].sh_link
;
2355 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
2357 #ifndef CONFIG_MODULE_UNLOAD
2358 /* Don't load .exit sections */
2359 if (strstarts(secstrings
+sechdrs
[i
].sh_name
, ".exit"))
2360 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2364 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
2365 ".gnu.linkonce.this_module");
2367 printk(KERN_WARNING
"No module found in object\n");
2371 /* This is temporary: point mod into copy of data. */
2372 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2374 if (symindex
== 0) {
2375 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2381 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
2382 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
2383 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
2385 /* Don't keep modinfo and version sections. */
2386 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2387 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2389 /* Check module struct version now, before we try to use module. */
2390 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
2395 err
= check_modinfo(mod
, sechdrs
, infoindex
, versindex
);
2399 /* Now copy in args */
2400 args
= strndup_user(uargs
, ~0UL >> 1);
2402 err
= PTR_ERR(args
);
2406 strmap
= kzalloc(BITS_TO_LONGS(sechdrs
[strindex
].sh_size
)
2407 * sizeof(long), GFP_KERNEL
);
2413 mod
->state
= MODULE_STATE_COMING
;
2415 /* Allow arches to frob section contents and sizes. */
2416 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
2421 /* We have a special allocation for this section. */
2422 err
= percpu_modalloc(mod
, sechdrs
[pcpuindex
].sh_size
,
2423 sechdrs
[pcpuindex
].sh_addralign
);
2426 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2428 /* Keep this around for failure path. */
2429 percpu
= mod_percpu(mod
);
2431 /* Determine total sizes, and put offsets in sh_entsize. For now
2432 this is done generically; there doesn't appear to be any
2433 special cases for the architectures. */
2434 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
2435 symoffs
= layout_symtab(mod
, sechdrs
, symindex
, strindex
, hdr
,
2436 secstrings
, &stroffs
, strmap
);
2438 /* Allocate and move to the final place */
2439 mod
= move_module(mod
, hdr
, sechdrs
, secstrings
, modindex
);
2445 #if defined(CONFIG_MODULE_UNLOAD)
2446 mod
->refptr
= alloc_percpu(struct module_ref
);
2452 /* Now we've moved module, initialize linked lists, etc. */
2453 module_unload_init(mod
);
2455 /* Set up license info based on the info section */
2456 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2459 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2460 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2461 * using GPL-only symbols it needs.
2463 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2464 add_taint(TAINT_PROPRIETARY_MODULE
);
2466 /* driverloader was caught wrongly pretending to be under GPL */
2467 if (strcmp(mod
->name
, "driverloader") == 0)
2468 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2470 /* Set up MODINFO_ATTR fields */
2471 setup_modinfo(mod
, sechdrs
, infoindex
);
2473 /* Fix up syms, so that st_value is a pointer to location. */
2474 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
2479 /* Now we've got everything in the final locations, we can
2480 * find optional sections. */
2481 find_module_sections(mod
, hdr
, sechdrs
, secstrings
);
2483 #ifdef CONFIG_MODVERSIONS
2484 if ((mod
->num_syms
&& !mod
->crcs
)
2485 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2486 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2487 #ifdef CONFIG_UNUSED_SYMBOLS
2488 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2489 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2492 err
= try_to_force_load(mod
,
2493 "no versions for exported symbols");
2499 /* Now do relocations. */
2500 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2501 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2502 unsigned int info
= sechdrs
[i
].sh_info
;
2504 /* Not a valid relocation section? */
2505 if (info
>= hdr
->e_shnum
)
2508 /* Don't bother with non-allocated sections */
2509 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2512 if (sechdrs
[i
].sh_type
== SHT_REL
)
2513 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2514 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2515 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2521 /* Set up and sort exception table */
2522 mod
->extable
= section_objs(hdr
, sechdrs
, secstrings
, "__ex_table",
2523 sizeof(*mod
->extable
), &mod
->num_exentries
);
2524 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2526 /* Finally, copy percpu area over. */
2527 percpu_modcopy(mod
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2528 sechdrs
[pcpuindex
].sh_size
);
2530 add_kallsyms(mod
, sechdrs
, hdr
->e_shnum
, symindex
, strindex
,
2531 symoffs
, stroffs
, secstrings
, strmap
);
2536 debug
= section_objs(hdr
, sechdrs
, secstrings
, "__verbose",
2537 sizeof(*debug
), &num_debug
);
2539 err
= module_finalize(hdr
, sechdrs
, mod
);
2543 /* flush the icache in correct context */
2548 * Flush the instruction cache, since we've played with text.
2549 * Do it before processing of module parameters, so the module
2550 * can provide parameter accessor functions of its own.
2552 if (mod
->module_init
)
2553 flush_icache_range((unsigned long)mod
->module_init
,
2554 (unsigned long)mod
->module_init
2556 flush_icache_range((unsigned long)mod
->module_core
,
2557 (unsigned long)mod
->module_core
+ mod
->core_size
);
2562 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2563 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2566 /* Now sew it into the lists so we can get lockdep and oops
2567 * info during argument parsing. Noone should access us, since
2568 * strong_try_module_get() will fail.
2569 * lockdep/oops can run asynchronous, so use the RCU list insertion
2570 * function to insert in a way safe to concurrent readers.
2571 * The mutex protects against concurrent writers.
2573 mutex_lock(&module_mutex
);
2574 if (find_module(mod
->name
)) {
2580 dynamic_debug_setup(debug
, num_debug
);
2582 /* Find duplicate symbols */
2583 err
= verify_export_symbols(mod
);
2587 list_add_rcu(&mod
->list
, &modules
);
2588 mutex_unlock(&module_mutex
);
2590 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2594 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2598 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2599 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2601 /* Get rid of temporary copy */
2604 trace_module_load(mod
);
2610 mutex_lock(&module_mutex
);
2611 /* Unlink carefully: kallsyms could be walking list. */
2612 list_del_rcu(&mod
->list
);
2614 dynamic_debug_remove(debug
);
2616 mutex_unlock(&module_mutex
);
2617 synchronize_sched();
2618 module_arch_cleanup(mod
);
2621 module_unload_free(mod
);
2622 #if defined(CONFIG_MODULE_UNLOAD)
2623 free_percpu(mod
->refptr
);
2626 module_free(mod
, mod
->module_init
);
2627 module_free(mod
, mod
->module_core
);
2628 /* mod will be freed with core. Don't access it beyond this line! */
2630 free_percpu(percpu
);
2636 return ERR_PTR(err
);
2639 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2644 /* Call module constructors. */
2645 static void do_mod_ctors(struct module
*mod
)
2647 #ifdef CONFIG_CONSTRUCTORS
2650 for (i
= 0; i
< mod
->num_ctors
; i
++)
2655 /* This is where the real work happens */
2656 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2657 unsigned long, len
, const char __user
*, uargs
)
2662 /* Must have permission */
2663 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2666 /* Do all the hard work */
2667 mod
= load_module(umod
, len
, uargs
);
2669 return PTR_ERR(mod
);
2671 blocking_notifier_call_chain(&module_notify_list
,
2672 MODULE_STATE_COMING
, mod
);
2675 /* Start the module */
2676 if (mod
->init
!= NULL
)
2677 ret
= do_one_initcall(mod
->init
);
2679 /* Init routine failed: abort. Try to protect us from
2680 buggy refcounters. */
2681 mod
->state
= MODULE_STATE_GOING
;
2682 synchronize_sched();
2684 blocking_notifier_call_chain(&module_notify_list
,
2685 MODULE_STATE_GOING
, mod
);
2687 wake_up(&module_wq
);
2692 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2693 "%s: loading module anyway...\n",
2694 __func__
, mod
->name
, ret
,
2699 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2700 mod
->state
= MODULE_STATE_LIVE
;
2701 wake_up(&module_wq
);
2702 blocking_notifier_call_chain(&module_notify_list
,
2703 MODULE_STATE_LIVE
, mod
);
2705 /* We need to finish all async code before the module init sequence is done */
2706 async_synchronize_full();
2708 mutex_lock(&module_mutex
);
2709 /* Drop initial reference. */
2711 trim_init_extable(mod
);
2712 #ifdef CONFIG_KALLSYMS
2713 mod
->num_symtab
= mod
->core_num_syms
;
2714 mod
->symtab
= mod
->core_symtab
;
2715 mod
->strtab
= mod
->core_strtab
;
2717 module_free(mod
, mod
->module_init
);
2718 mod
->module_init
= NULL
;
2720 mod
->init_text_size
= 0;
2721 mutex_unlock(&module_mutex
);
2726 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2728 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2731 #ifdef CONFIG_KALLSYMS
2733 * This ignores the intensely annoying "mapping symbols" found
2734 * in ARM ELF files: $a, $t and $d.
2736 static inline int is_arm_mapping_symbol(const char *str
)
2738 return str
[0] == '$' && strchr("atd", str
[1])
2739 && (str
[2] == '\0' || str
[2] == '.');
2742 static const char *get_ksymbol(struct module
*mod
,
2744 unsigned long *size
,
2745 unsigned long *offset
)
2747 unsigned int i
, best
= 0;
2748 unsigned long nextval
;
2750 /* At worse, next value is at end of module */
2751 if (within_module_init(addr
, mod
))
2752 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2754 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2756 /* Scan for closest preceeding symbol, and next symbol. (ELF
2757 starts real symbols at 1). */
2758 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2759 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2762 /* We ignore unnamed symbols: they're uninformative
2763 * and inserted at a whim. */
2764 if (mod
->symtab
[i
].st_value
<= addr
2765 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2766 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2767 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2769 if (mod
->symtab
[i
].st_value
> addr
2770 && mod
->symtab
[i
].st_value
< nextval
2771 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2772 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2773 nextval
= mod
->symtab
[i
].st_value
;
2780 *size
= nextval
- mod
->symtab
[best
].st_value
;
2782 *offset
= addr
- mod
->symtab
[best
].st_value
;
2783 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2786 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2787 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2788 const char *module_address_lookup(unsigned long addr
,
2789 unsigned long *size
,
2790 unsigned long *offset
,
2795 const char *ret
= NULL
;
2798 list_for_each_entry_rcu(mod
, &modules
, list
) {
2799 if (within_module_init(addr
, mod
) ||
2800 within_module_core(addr
, mod
)) {
2802 *modname
= mod
->name
;
2803 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2807 /* Make a copy in here where it's safe */
2809 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2816 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2821 list_for_each_entry_rcu(mod
, &modules
, list
) {
2822 if (within_module_init(addr
, mod
) ||
2823 within_module_core(addr
, mod
)) {
2826 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2829 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2839 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2840 unsigned long *offset
, char *modname
, char *name
)
2845 list_for_each_entry_rcu(mod
, &modules
, list
) {
2846 if (within_module_init(addr
, mod
) ||
2847 within_module_core(addr
, mod
)) {
2850 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2854 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2856 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2866 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2867 char *name
, char *module_name
, int *exported
)
2872 list_for_each_entry_rcu(mod
, &modules
, list
) {
2873 if (symnum
< mod
->num_symtab
) {
2874 *value
= mod
->symtab
[symnum
].st_value
;
2875 *type
= mod
->symtab
[symnum
].st_info
;
2876 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2878 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2879 *exported
= is_exported(name
, *value
, mod
);
2883 symnum
-= mod
->num_symtab
;
2889 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2893 for (i
= 0; i
< mod
->num_symtab
; i
++)
2894 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2895 mod
->symtab
[i
].st_info
!= 'U')
2896 return mod
->symtab
[i
].st_value
;
2900 /* Look for this name: can be of form module:name. */
2901 unsigned long module_kallsyms_lookup_name(const char *name
)
2905 unsigned long ret
= 0;
2907 /* Don't lock: we're in enough trouble already. */
2909 if ((colon
= strchr(name
, ':')) != NULL
) {
2911 if ((mod
= find_module(name
)) != NULL
)
2912 ret
= mod_find_symname(mod
, colon
+1);
2915 list_for_each_entry_rcu(mod
, &modules
, list
)
2916 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2923 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2924 struct module
*, unsigned long),
2931 list_for_each_entry(mod
, &modules
, list
) {
2932 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2933 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2934 mod
, mod
->symtab
[i
].st_value
);
2941 #endif /* CONFIG_KALLSYMS */
2943 static char *module_flags(struct module
*mod
, char *buf
)
2948 mod
->state
== MODULE_STATE_GOING
||
2949 mod
->state
== MODULE_STATE_COMING
) {
2951 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
2953 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
2955 if (mod
->taints
& (1 << TAINT_CRAP
))
2958 * TAINT_FORCED_RMMOD: could be added.
2959 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2963 /* Show a - for module-is-being-unloaded */
2964 if (mod
->state
== MODULE_STATE_GOING
)
2966 /* Show a + for module-is-being-loaded */
2967 if (mod
->state
== MODULE_STATE_COMING
)
2976 #ifdef CONFIG_PROC_FS
2977 /* Called by the /proc file system to return a list of modules. */
2978 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2980 mutex_lock(&module_mutex
);
2981 return seq_list_start(&modules
, *pos
);
2984 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2986 return seq_list_next(p
, &modules
, pos
);
2989 static void m_stop(struct seq_file
*m
, void *p
)
2991 mutex_unlock(&module_mutex
);
2994 static int m_show(struct seq_file
*m
, void *p
)
2996 struct module
*mod
= list_entry(p
, struct module
, list
);
2999 seq_printf(m
, "%s %u",
3000 mod
->name
, mod
->init_size
+ mod
->core_size
);
3001 print_unload_info(m
, mod
);
3003 /* Informative for users. */
3004 seq_printf(m
, " %s",
3005 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3006 mod
->state
== MODULE_STATE_COMING
? "Loading":
3008 /* Used by oprofile and other similar tools. */
3009 seq_printf(m
, " 0x%p", mod
->module_core
);
3013 seq_printf(m
, " %s", module_flags(mod
, buf
));
3015 seq_printf(m
, "\n");
3019 /* Format: modulename size refcount deps address
3021 Where refcount is a number or -, and deps is a comma-separated list
3024 static const struct seq_operations modules_op
= {
3031 static int modules_open(struct inode
*inode
, struct file
*file
)
3033 return seq_open(file
, &modules_op
);
3036 static const struct file_operations proc_modules_operations
= {
3037 .open
= modules_open
,
3039 .llseek
= seq_lseek
,
3040 .release
= seq_release
,
3043 static int __init
proc_modules_init(void)
3045 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3048 module_init(proc_modules_init
);
3051 /* Given an address, look for it in the module exception tables. */
3052 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3054 const struct exception_table_entry
*e
= NULL
;
3058 list_for_each_entry_rcu(mod
, &modules
, list
) {
3059 if (mod
->num_exentries
== 0)
3062 e
= search_extable(mod
->extable
,
3063 mod
->extable
+ mod
->num_exentries
- 1,
3070 /* Now, if we found one, we are running inside it now, hence
3071 we cannot unload the module, hence no refcnt needed. */
3076 * is_module_address - is this address inside a module?
3077 * @addr: the address to check.
3079 * See is_module_text_address() if you simply want to see if the address
3080 * is code (not data).
3082 bool is_module_address(unsigned long addr
)
3087 ret
= __module_address(addr
) != NULL
;
3094 * __module_address - get the module which contains an address.
3095 * @addr: the address.
3097 * Must be called with preempt disabled or module mutex held so that
3098 * module doesn't get freed during this.
3100 struct module
*__module_address(unsigned long addr
)
3104 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3107 list_for_each_entry_rcu(mod
, &modules
, list
)
3108 if (within_module_core(addr
, mod
)
3109 || within_module_init(addr
, mod
))
3113 EXPORT_SYMBOL_GPL(__module_address
);
3116 * is_module_text_address - is this address inside module code?
3117 * @addr: the address to check.
3119 * See is_module_address() if you simply want to see if the address is
3120 * anywhere in a module. See kernel_text_address() for testing if an
3121 * address corresponds to kernel or module code.
3123 bool is_module_text_address(unsigned long addr
)
3128 ret
= __module_text_address(addr
) != NULL
;
3135 * __module_text_address - get the module whose code contains an address.
3136 * @addr: the address.
3138 * Must be called with preempt disabled or module mutex held so that
3139 * module doesn't get freed during this.
3141 struct module
*__module_text_address(unsigned long addr
)
3143 struct module
*mod
= __module_address(addr
);
3145 /* Make sure it's within the text section. */
3146 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3147 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3152 EXPORT_SYMBOL_GPL(__module_text_address
);
3154 /* Don't grab lock, we're oopsing. */
3155 void print_modules(void)
3160 printk(KERN_DEFAULT
"Modules linked in:");
3161 /* Most callers should already have preempt disabled, but make sure */
3163 list_for_each_entry_rcu(mod
, &modules
, list
)
3164 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3166 if (last_unloaded_module
[0])
3167 printk(" [last unloaded: %s]", last_unloaded_module
);
3171 #ifdef CONFIG_MODVERSIONS
3172 /* Generate the signature for all relevant module structures here.
3173 * If these change, we don't want to try to parse the module. */
3174 void module_layout(struct module
*mod
,
3175 struct modversion_info
*ver
,
3176 struct kernel_param
*kp
,
3177 struct kernel_symbol
*ks
,
3178 struct tracepoint
*tp
)
3181 EXPORT_SYMBOL(module_layout
);
3184 #ifdef CONFIG_TRACEPOINTS
3185 void module_update_tracepoints(void)
3189 mutex_lock(&module_mutex
);
3190 list_for_each_entry(mod
, &modules
, list
)
3192 tracepoint_update_probe_range(mod
->tracepoints
,
3193 mod
->tracepoints
+ mod
->num_tracepoints
);
3194 mutex_unlock(&module_mutex
);
3198 * Returns 0 if current not found.
3199 * Returns 1 if current found.
3201 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
3203 struct module
*iter_mod
;
3206 mutex_lock(&module_mutex
);
3207 list_for_each_entry(iter_mod
, &modules
, list
) {
3208 if (!iter_mod
->taints
) {
3210 * Sorted module list
3212 if (iter_mod
< iter
->module
)
3214 else if (iter_mod
> iter
->module
)
3215 iter
->tracepoint
= NULL
;
3216 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
3217 iter_mod
->tracepoints
,
3218 iter_mod
->tracepoints
3219 + iter_mod
->num_tracepoints
);
3221 iter
->module
= iter_mod
;
3226 mutex_unlock(&module_mutex
);