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 static 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 int module_unload_init(struct module
*mod
)
529 mod
->refptr
= alloc_percpu(struct module_ref
);
533 INIT_LIST_HEAD(&mod
->source_list
);
534 INIT_LIST_HEAD(&mod
->target_list
);
536 /* Hold reference count during initialization. */
537 __this_cpu_write(mod
->refptr
->incs
, 1);
538 /* Backwards compatibility macros put refcount during init. */
539 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 ref_module(struct module
*a
, struct module
*b
)
589 if (b
== NULL
|| already_uses(a
, b
))
592 /* If module isn't available, we fail. */
593 err
= strong_try_module_get(b
);
597 err
= add_module_usage(a
, b
);
604 EXPORT_SYMBOL_GPL(ref_module
);
606 /* Clear the unload stuff of the module. */
607 static void module_unload_free(struct module
*mod
)
609 struct module_use
*use
, *tmp
;
611 mutex_lock(&module_mutex
);
612 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
613 struct module
*i
= use
->target
;
614 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
616 list_del(&use
->source_list
);
617 list_del(&use
->target_list
);
620 mutex_unlock(&module_mutex
);
622 free_percpu(mod
->refptr
);
625 #ifdef CONFIG_MODULE_FORCE_UNLOAD
626 static inline int try_force_unload(unsigned int flags
)
628 int ret
= (flags
& O_TRUNC
);
630 add_taint(TAINT_FORCED_RMMOD
);
634 static inline int try_force_unload(unsigned int flags
)
638 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
647 /* Whole machine is stopped with interrupts off when this runs. */
648 static int __try_stop_module(void *_sref
)
650 struct stopref
*sref
= _sref
;
652 /* If it's not unused, quit unless we're forcing. */
653 if (module_refcount(sref
->mod
) != 0) {
654 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
658 /* Mark it as dying. */
659 sref
->mod
->state
= MODULE_STATE_GOING
;
663 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
665 if (flags
& O_NONBLOCK
) {
666 struct stopref sref
= { mod
, flags
, forced
};
668 return stop_machine(__try_stop_module
, &sref
, NULL
);
670 /* We don't need to stop the machine for this. */
671 mod
->state
= MODULE_STATE_GOING
;
677 unsigned int module_refcount(struct module
*mod
)
679 unsigned int incs
= 0, decs
= 0;
682 for_each_possible_cpu(cpu
)
683 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
685 * ensure the incs are added up after the decs.
686 * module_put ensures incs are visible before decs with smp_wmb.
688 * This 2-count scheme avoids the situation where the refcount
689 * for CPU0 is read, then CPU0 increments the module refcount,
690 * then CPU1 drops that refcount, then the refcount for CPU1 is
691 * read. We would record a decrement but not its corresponding
692 * increment so we would see a low count (disaster).
694 * Rare situation? But module_refcount can be preempted, and we
695 * might be tallying up 4096+ CPUs. So it is not impossible.
698 for_each_possible_cpu(cpu
)
699 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
702 EXPORT_SYMBOL(module_refcount
);
704 /* This exists whether we can unload or not */
705 static void free_module(struct module
*mod
);
707 static void wait_for_zero_refcount(struct module
*mod
)
709 /* Since we might sleep for some time, release the mutex first */
710 mutex_unlock(&module_mutex
);
712 DEBUGP("Looking at refcount...\n");
713 set_current_state(TASK_UNINTERRUPTIBLE
);
714 if (module_refcount(mod
) == 0)
718 current
->state
= TASK_RUNNING
;
719 mutex_lock(&module_mutex
);
722 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
726 char name
[MODULE_NAME_LEN
];
729 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
732 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
734 name
[MODULE_NAME_LEN
-1] = '\0';
736 if (mutex_lock_interruptible(&module_mutex
) != 0)
739 mod
= find_module(name
);
745 if (!list_empty(&mod
->source_list
)) {
746 /* Other modules depend on us: get rid of them first. */
751 /* Doing init or already dying? */
752 if (mod
->state
!= MODULE_STATE_LIVE
) {
753 /* FIXME: if (force), slam module count and wake up
755 DEBUGP("%s already dying\n", mod
->name
);
760 /* If it has an init func, it must have an exit func to unload */
761 if (mod
->init
&& !mod
->exit
) {
762 forced
= try_force_unload(flags
);
764 /* This module can't be removed */
770 /* Set this up before setting mod->state */
771 mod
->waiter
= current
;
773 /* Stop the machine so refcounts can't move and disable module. */
774 ret
= try_stop_module(mod
, flags
, &forced
);
778 /* Never wait if forced. */
779 if (!forced
&& module_refcount(mod
) != 0)
780 wait_for_zero_refcount(mod
);
782 mutex_unlock(&module_mutex
);
783 /* Final destruction now noone is using it. */
784 if (mod
->exit
!= NULL
)
786 blocking_notifier_call_chain(&module_notify_list
,
787 MODULE_STATE_GOING
, mod
);
788 async_synchronize_full();
790 /* Store the name of the last unloaded module for diagnostic purposes */
791 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
796 mutex_unlock(&module_mutex
);
800 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
802 struct module_use
*use
;
803 int printed_something
= 0;
805 seq_printf(m
, " %u ", module_refcount(mod
));
807 /* Always include a trailing , so userspace can differentiate
808 between this and the old multi-field proc format. */
809 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
810 printed_something
= 1;
811 seq_printf(m
, "%s,", use
->source
->name
);
814 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
815 printed_something
= 1;
816 seq_printf(m
, "[permanent],");
819 if (!printed_something
)
823 void __symbol_put(const char *symbol
)
825 struct module
*owner
;
828 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
833 EXPORT_SYMBOL(__symbol_put
);
835 /* Note this assumes addr is a function, which it currently always is. */
836 void symbol_put_addr(void *addr
)
838 struct module
*modaddr
;
839 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
841 if (core_kernel_text(a
))
844 /* module_text_address is safe here: we're supposed to have reference
845 * to module from symbol_get, so it can't go away. */
846 modaddr
= __module_text_address(a
);
850 EXPORT_SYMBOL_GPL(symbol_put_addr
);
852 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
853 struct module
*mod
, char *buffer
)
855 return sprintf(buffer
, "%u\n", module_refcount(mod
));
858 static struct module_attribute refcnt
= {
859 .attr
= { .name
= "refcnt", .mode
= 0444 },
863 void module_put(struct module
*module
)
867 smp_wmb(); /* see comment in module_refcount */
868 __this_cpu_inc(module
->refptr
->decs
);
870 trace_module_put(module
, _RET_IP_
);
871 /* Maybe they're waiting for us to drop reference? */
872 if (unlikely(!module_is_live(module
)))
873 wake_up_process(module
->waiter
);
877 EXPORT_SYMBOL(module_put
);
879 #else /* !CONFIG_MODULE_UNLOAD */
880 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
882 /* We don't know the usage count, or what modules are using. */
883 seq_printf(m
, " - -");
886 static inline void module_unload_free(struct module
*mod
)
890 int ref_module(struct module
*a
, struct module
*b
)
892 return strong_try_module_get(b
);
894 EXPORT_SYMBOL_GPL(ref_module
);
896 static inline int module_unload_init(struct module
*mod
)
900 #endif /* CONFIG_MODULE_UNLOAD */
902 static ssize_t
show_initstate(struct module_attribute
*mattr
,
903 struct module
*mod
, char *buffer
)
905 const char *state
= "unknown";
907 switch (mod
->state
) {
908 case MODULE_STATE_LIVE
:
911 case MODULE_STATE_COMING
:
914 case MODULE_STATE_GOING
:
918 return sprintf(buffer
, "%s\n", state
);
921 static struct module_attribute initstate
= {
922 .attr
= { .name
= "initstate", .mode
= 0444 },
923 .show
= show_initstate
,
926 static struct module_attribute
*modinfo_attrs
[] = {
930 #ifdef CONFIG_MODULE_UNLOAD
936 static const char vermagic
[] = VERMAGIC_STRING
;
938 static int try_to_force_load(struct module
*mod
, const char *reason
)
940 #ifdef CONFIG_MODULE_FORCE_LOAD
941 if (!test_taint(TAINT_FORCED_MODULE
))
942 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
944 add_taint_module(mod
, TAINT_FORCED_MODULE
);
951 #ifdef CONFIG_MODVERSIONS
952 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
953 static unsigned long maybe_relocated(unsigned long crc
,
954 const struct module
*crc_owner
)
956 #ifdef ARCH_RELOCATES_KCRCTAB
957 if (crc_owner
== NULL
)
958 return crc
- (unsigned long)reloc_start
;
963 static int check_version(Elf_Shdr
*sechdrs
,
964 unsigned int versindex
,
967 const unsigned long *crc
,
968 const struct module
*crc_owner
)
970 unsigned int i
, num_versions
;
971 struct modversion_info
*versions
;
973 /* Exporting module didn't supply crcs? OK, we're already tainted. */
977 /* No versions at all? modprobe --force does this. */
979 return try_to_force_load(mod
, symname
) == 0;
981 versions
= (void *) sechdrs
[versindex
].sh_addr
;
982 num_versions
= sechdrs
[versindex
].sh_size
983 / sizeof(struct modversion_info
);
985 for (i
= 0; i
< num_versions
; i
++) {
986 if (strcmp(versions
[i
].name
, symname
) != 0)
989 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
991 DEBUGP("Found checksum %lX vs module %lX\n",
992 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
996 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1001 printk("%s: disagrees about version of symbol %s\n",
1002 mod
->name
, symname
);
1006 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1007 unsigned int versindex
,
1010 const unsigned long *crc
;
1012 /* Since this should be found in kernel (which can't be removed),
1013 * no locking is necessary. */
1014 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1017 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1021 /* First part is kernel version, which we ignore if module has crcs. */
1022 static inline int same_magic(const char *amagic
, const char *bmagic
,
1026 amagic
+= strcspn(amagic
, " ");
1027 bmagic
+= strcspn(bmagic
, " ");
1029 return strcmp(amagic
, bmagic
) == 0;
1032 static inline int check_version(Elf_Shdr
*sechdrs
,
1033 unsigned int versindex
,
1034 const char *symname
,
1036 const unsigned long *crc
,
1037 const struct module
*crc_owner
)
1042 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1043 unsigned int versindex
,
1049 static inline int same_magic(const char *amagic
, const char *bmagic
,
1052 return strcmp(amagic
, bmagic
) == 0;
1054 #endif /* CONFIG_MODVERSIONS */
1056 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1057 static const struct kernel_symbol
*resolve_symbol(Elf_Shdr
*sechdrs
,
1058 unsigned int versindex
,
1063 struct module
*owner
;
1064 const struct kernel_symbol
*sym
;
1065 const unsigned long *crc
;
1068 mutex_lock(&module_mutex
);
1069 sym
= find_symbol(name
, &owner
, &crc
,
1070 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1074 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
, owner
)) {
1075 sym
= ERR_PTR(-EINVAL
);
1079 err
= ref_module(mod
, owner
);
1086 /* We must make copy under the lock if we failed to get ref. */
1087 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1089 mutex_unlock(&module_mutex
);
1093 static const struct kernel_symbol
*resolve_symbol_wait(Elf_Shdr
*sechdrs
,
1094 unsigned int versindex
,
1098 const struct kernel_symbol
*ksym
;
1099 char ownername
[MODULE_NAME_LEN
];
1101 if (wait_event_interruptible_timeout(module_wq
,
1102 !IS_ERR(ksym
= resolve_symbol(sechdrs
, versindex
, name
,
1104 PTR_ERR(ksym
) != -EBUSY
,
1106 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1107 mod
->name
, ownername
);
1113 * /sys/module/foo/sections stuff
1114 * J. Corbet <corbet@lwn.net>
1116 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1118 static inline bool sect_empty(const Elf_Shdr
*sect
)
1120 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1123 struct module_sect_attr
1125 struct module_attribute mattr
;
1127 unsigned long address
;
1130 struct module_sect_attrs
1132 struct attribute_group grp
;
1133 unsigned int nsections
;
1134 struct module_sect_attr attrs
[0];
1137 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1138 struct module
*mod
, char *buf
)
1140 struct module_sect_attr
*sattr
=
1141 container_of(mattr
, struct module_sect_attr
, mattr
);
1142 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1145 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1147 unsigned int section
;
1149 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1150 kfree(sect_attrs
->attrs
[section
].name
);
1154 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1155 char *secstrings
, Elf_Shdr
*sechdrs
)
1157 unsigned int nloaded
= 0, i
, size
[2];
1158 struct module_sect_attrs
*sect_attrs
;
1159 struct module_sect_attr
*sattr
;
1160 struct attribute
**gattr
;
1162 /* Count loaded sections and allocate structures */
1163 for (i
= 0; i
< nsect
; i
++)
1164 if (!sect_empty(&sechdrs
[i
]))
1166 size
[0] = ALIGN(sizeof(*sect_attrs
)
1167 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1168 sizeof(sect_attrs
->grp
.attrs
[0]));
1169 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1170 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1171 if (sect_attrs
== NULL
)
1174 /* Setup section attributes. */
1175 sect_attrs
->grp
.name
= "sections";
1176 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1178 sect_attrs
->nsections
= 0;
1179 sattr
= §_attrs
->attrs
[0];
1180 gattr
= §_attrs
->grp
.attrs
[0];
1181 for (i
= 0; i
< nsect
; i
++) {
1182 if (sect_empty(&sechdrs
[i
]))
1184 sattr
->address
= sechdrs
[i
].sh_addr
;
1185 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1187 if (sattr
->name
== NULL
)
1189 sect_attrs
->nsections
++;
1190 sysfs_attr_init(&sattr
->mattr
.attr
);
1191 sattr
->mattr
.show
= module_sect_show
;
1192 sattr
->mattr
.store
= NULL
;
1193 sattr
->mattr
.attr
.name
= sattr
->name
;
1194 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1195 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1199 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1202 mod
->sect_attrs
= sect_attrs
;
1205 free_sect_attrs(sect_attrs
);
1208 static void remove_sect_attrs(struct module
*mod
)
1210 if (mod
->sect_attrs
) {
1211 sysfs_remove_group(&mod
->mkobj
.kobj
,
1212 &mod
->sect_attrs
->grp
);
1213 /* We are positive that no one is using any sect attrs
1214 * at this point. Deallocate immediately. */
1215 free_sect_attrs(mod
->sect_attrs
);
1216 mod
->sect_attrs
= NULL
;
1221 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1224 struct module_notes_attrs
{
1225 struct kobject
*dir
;
1227 struct bin_attribute attrs
[0];
1230 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1231 struct bin_attribute
*bin_attr
,
1232 char *buf
, loff_t pos
, size_t count
)
1235 * The caller checked the pos and count against our size.
1237 memcpy(buf
, bin_attr
->private + pos
, count
);
1241 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1244 if (notes_attrs
->dir
) {
1246 sysfs_remove_bin_file(notes_attrs
->dir
,
1247 ¬es_attrs
->attrs
[i
]);
1248 kobject_put(notes_attrs
->dir
);
1253 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1254 char *secstrings
, Elf_Shdr
*sechdrs
)
1256 unsigned int notes
, loaded
, i
;
1257 struct module_notes_attrs
*notes_attrs
;
1258 struct bin_attribute
*nattr
;
1260 /* failed to create section attributes, so can't create notes */
1261 if (!mod
->sect_attrs
)
1264 /* Count notes sections and allocate structures. */
1266 for (i
= 0; i
< nsect
; i
++)
1267 if (!sect_empty(&sechdrs
[i
]) &&
1268 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1274 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1275 + notes
* sizeof(notes_attrs
->attrs
[0]),
1277 if (notes_attrs
== NULL
)
1280 notes_attrs
->notes
= notes
;
1281 nattr
= ¬es_attrs
->attrs
[0];
1282 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1283 if (sect_empty(&sechdrs
[i
]))
1285 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1286 sysfs_bin_attr_init(nattr
);
1287 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1288 nattr
->attr
.mode
= S_IRUGO
;
1289 nattr
->size
= sechdrs
[i
].sh_size
;
1290 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1291 nattr
->read
= module_notes_read
;
1297 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1298 if (!notes_attrs
->dir
)
1301 for (i
= 0; i
< notes
; ++i
)
1302 if (sysfs_create_bin_file(notes_attrs
->dir
,
1303 ¬es_attrs
->attrs
[i
]))
1306 mod
->notes_attrs
= notes_attrs
;
1310 free_notes_attrs(notes_attrs
, i
);
1313 static void remove_notes_attrs(struct module
*mod
)
1315 if (mod
->notes_attrs
)
1316 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1321 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1322 char *sectstrings
, Elf_Shdr
*sechdrs
)
1326 static inline void remove_sect_attrs(struct module
*mod
)
1330 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1331 char *sectstrings
, Elf_Shdr
*sechdrs
)
1335 static inline void remove_notes_attrs(struct module
*mod
)
1341 static void add_usage_links(struct module
*mod
)
1343 #ifdef CONFIG_MODULE_UNLOAD
1344 struct module_use
*use
;
1347 mutex_lock(&module_mutex
);
1348 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1349 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1350 &mod
->mkobj
.kobj
, mod
->name
);
1352 mutex_unlock(&module_mutex
);
1356 static void del_usage_links(struct module
*mod
)
1358 #ifdef CONFIG_MODULE_UNLOAD
1359 struct module_use
*use
;
1361 mutex_lock(&module_mutex
);
1362 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1363 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1364 mutex_unlock(&module_mutex
);
1368 static int module_add_modinfo_attrs(struct module
*mod
)
1370 struct module_attribute
*attr
;
1371 struct module_attribute
*temp_attr
;
1375 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1376 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1378 if (!mod
->modinfo_attrs
)
1381 temp_attr
= mod
->modinfo_attrs
;
1382 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1384 (attr
->test
&& attr
->test(mod
))) {
1385 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1386 sysfs_attr_init(&temp_attr
->attr
);
1387 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1394 static void module_remove_modinfo_attrs(struct module
*mod
)
1396 struct module_attribute
*attr
;
1399 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1400 /* pick a field to test for end of list */
1401 if (!attr
->attr
.name
)
1403 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1407 kfree(mod
->modinfo_attrs
);
1410 static int mod_sysfs_init(struct module
*mod
)
1413 struct kobject
*kobj
;
1415 if (!module_sysfs_initialized
) {
1416 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1422 kobj
= kset_find_obj(module_kset
, mod
->name
);
1424 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1430 mod
->mkobj
.mod
= mod
;
1432 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1433 mod
->mkobj
.kobj
.kset
= module_kset
;
1434 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1437 kobject_put(&mod
->mkobj
.kobj
);
1439 /* delay uevent until full sysfs population */
1444 static int mod_sysfs_setup(struct module
*mod
,
1445 struct kernel_param
*kparam
,
1446 unsigned int num_params
)
1450 err
= mod_sysfs_init(mod
);
1454 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1455 if (!mod
->holders_dir
) {
1460 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1462 goto out_unreg_holders
;
1464 err
= module_add_modinfo_attrs(mod
);
1466 goto out_unreg_param
;
1468 add_usage_links(mod
);
1470 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1474 module_param_sysfs_remove(mod
);
1476 kobject_put(mod
->holders_dir
);
1478 kobject_put(&mod
->mkobj
.kobj
);
1483 static void mod_sysfs_fini(struct module
*mod
)
1485 kobject_put(&mod
->mkobj
.kobj
);
1488 #else /* CONFIG_SYSFS */
1490 static inline int mod_sysfs_init(struct module
*mod
)
1495 static inline int mod_sysfs_setup(struct module
*mod
,
1496 struct kernel_param
*kparam
,
1497 unsigned int num_params
)
1502 static inline int module_add_modinfo_attrs(struct module
*mod
)
1507 static inline void module_remove_modinfo_attrs(struct module
*mod
)
1511 static void mod_sysfs_fini(struct module
*mod
)
1515 static void del_usage_links(struct module
*mod
)
1519 #endif /* CONFIG_SYSFS */
1521 static void mod_kobject_remove(struct module
*mod
)
1523 del_usage_links(mod
);
1524 module_remove_modinfo_attrs(mod
);
1525 module_param_sysfs_remove(mod
);
1526 kobject_put(mod
->mkobj
.drivers_dir
);
1527 kobject_put(mod
->holders_dir
);
1528 mod_sysfs_fini(mod
);
1532 * unlink the module with the whole machine is stopped with interrupts off
1533 * - this defends against kallsyms not taking locks
1535 static int __unlink_module(void *_mod
)
1537 struct module
*mod
= _mod
;
1538 list_del(&mod
->list
);
1542 /* Free a module, remove from lists, etc. */
1543 static void free_module(struct module
*mod
)
1545 trace_module_free(mod
);
1547 /* Delete from various lists */
1548 mutex_lock(&module_mutex
);
1549 stop_machine(__unlink_module
, mod
, NULL
);
1550 mutex_unlock(&module_mutex
);
1551 remove_notes_attrs(mod
);
1552 remove_sect_attrs(mod
);
1553 mod_kobject_remove(mod
);
1555 /* Remove dynamic debug info */
1556 ddebug_remove_module(mod
->name
);
1558 /* Arch-specific cleanup. */
1559 module_arch_cleanup(mod
);
1561 /* Module unload stuff */
1562 module_unload_free(mod
);
1564 /* Free any allocated parameters. */
1565 destroy_params(mod
->kp
, mod
->num_kp
);
1567 /* This may be NULL, but that's OK */
1568 module_free(mod
, mod
->module_init
);
1570 percpu_modfree(mod
);
1572 /* Free lock-classes: */
1573 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1575 /* Finally, free the core (containing the module structure) */
1576 module_free(mod
, mod
->module_core
);
1579 update_protections(current
->mm
);
1583 void *__symbol_get(const char *symbol
)
1585 struct module
*owner
;
1586 const struct kernel_symbol
*sym
;
1589 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1590 if (sym
&& strong_try_module_get(owner
))
1594 return sym
? (void *)sym
->value
: NULL
;
1596 EXPORT_SYMBOL_GPL(__symbol_get
);
1599 * Ensure that an exported symbol [global namespace] does not already exist
1600 * in the kernel or in some other module's exported symbol table.
1602 * You must hold the module_mutex.
1604 static int verify_export_symbols(struct module
*mod
)
1607 struct module
*owner
;
1608 const struct kernel_symbol
*s
;
1610 const struct kernel_symbol
*sym
;
1613 { mod
->syms
, mod
->num_syms
},
1614 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1615 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1616 #ifdef CONFIG_UNUSED_SYMBOLS
1617 { mod
->unused_syms
, mod
->num_unused_syms
},
1618 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1622 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1623 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1624 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1626 "%s: exports duplicate symbol %s"
1628 mod
->name
, s
->name
, module_name(owner
));
1636 /* Change all symbols so that st_value encodes the pointer directly. */
1637 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1638 unsigned int symindex
,
1640 unsigned int versindex
,
1641 unsigned int pcpuindex
,
1644 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1645 unsigned long secbase
;
1646 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1648 const struct kernel_symbol
*ksym
;
1650 for (i
= 1; i
< n
; i
++) {
1651 switch (sym
[i
].st_shndx
) {
1653 /* We compiled with -fno-common. These are not
1654 supposed to happen. */
1655 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1656 printk("%s: please compile with -fno-common\n",
1662 /* Don't need to do anything */
1663 DEBUGP("Absolute symbol: 0x%08lx\n",
1664 (long)sym
[i
].st_value
);
1668 ksym
= resolve_symbol_wait(sechdrs
, versindex
,
1669 strtab
+ sym
[i
].st_name
,
1671 /* Ok if resolved. */
1672 if (ksym
&& !IS_ERR(ksym
)) {
1673 sym
[i
].st_value
= ksym
->value
;
1678 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1681 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
1682 mod
->name
, strtab
+ sym
[i
].st_name
,
1684 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
1688 /* Divert to percpu allocation if a percpu var. */
1689 if (sym
[i
].st_shndx
== pcpuindex
)
1690 secbase
= (unsigned long)mod_percpu(mod
);
1692 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1693 sym
[i
].st_value
+= secbase
;
1701 static int apply_relocations(struct module
*mod
,
1704 unsigned int symindex
,
1705 unsigned int strindex
)
1710 /* Now do relocations. */
1711 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1712 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1713 unsigned int info
= sechdrs
[i
].sh_info
;
1715 /* Not a valid relocation section? */
1716 if (info
>= hdr
->e_shnum
)
1719 /* Don't bother with non-allocated sections */
1720 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1723 if (sechdrs
[i
].sh_type
== SHT_REL
)
1724 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
, mod
);
1725 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1726 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1734 /* Additional bytes needed by arch in front of individual sections */
1735 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
1736 unsigned int section
)
1738 /* default implementation just returns zero */
1742 /* Update size with this section: return offset. */
1743 static long get_offset(struct module
*mod
, unsigned int *size
,
1744 Elf_Shdr
*sechdr
, unsigned int section
)
1748 *size
+= arch_mod_section_prepend(mod
, section
);
1749 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1750 *size
= ret
+ sechdr
->sh_size
;
1754 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1755 might -- code, read-only data, read-write data, small data. Tally
1756 sizes, and place the offsets into sh_entsize fields: high bit means it
1758 static void layout_sections(struct module
*mod
,
1759 const Elf_Ehdr
*hdr
,
1761 const char *secstrings
)
1763 static unsigned long const masks
[][2] = {
1764 /* NOTE: all executable code must be the first section
1765 * in this array; otherwise modify the text_size
1766 * finder in the two loops below */
1767 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1768 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1769 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1770 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1774 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1775 sechdrs
[i
].sh_entsize
= ~0UL;
1777 DEBUGP("Core section allocation order:\n");
1778 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1779 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1780 Elf_Shdr
*s
= &sechdrs
[i
];
1782 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1783 || (s
->sh_flags
& masks
[m
][1])
1784 || s
->sh_entsize
!= ~0UL
1785 || strstarts(secstrings
+ s
->sh_name
, ".init"))
1787 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
1788 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1791 mod
->core_text_size
= mod
->core_size
;
1794 DEBUGP("Init section allocation order:\n");
1795 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1796 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1797 Elf_Shdr
*s
= &sechdrs
[i
];
1799 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1800 || (s
->sh_flags
& masks
[m
][1])
1801 || s
->sh_entsize
!= ~0UL
1802 || !strstarts(secstrings
+ s
->sh_name
, ".init"))
1804 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
1805 | INIT_OFFSET_MASK
);
1806 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1809 mod
->init_text_size
= mod
->init_size
;
1813 static void set_license(struct module
*mod
, const char *license
)
1816 license
= "unspecified";
1818 if (!license_is_gpl_compatible(license
)) {
1819 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
1820 printk(KERN_WARNING
"%s: module license '%s' taints "
1821 "kernel.\n", mod
->name
, license
);
1822 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1826 /* Parse tag=value strings from .modinfo section */
1827 static char *next_string(char *string
, unsigned long *secsize
)
1829 /* Skip non-zero chars */
1832 if ((*secsize
)-- <= 1)
1836 /* Skip any zero padding. */
1837 while (!string
[0]) {
1839 if ((*secsize
)-- <= 1)
1845 static char *get_modinfo(const Elf_Shdr
*sechdrs
,
1850 unsigned int taglen
= strlen(tag
);
1851 unsigned long size
= sechdrs
[info
].sh_size
;
1853 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1854 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1855 return p
+ taglen
+ 1;
1860 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1861 unsigned int infoindex
)
1863 struct module_attribute
*attr
;
1866 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1869 get_modinfo(sechdrs
,
1875 static void free_modinfo(struct module
*mod
)
1877 struct module_attribute
*attr
;
1880 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1886 #ifdef CONFIG_KALLSYMS
1888 /* lookup symbol in given range of kernel_symbols */
1889 static const struct kernel_symbol
*lookup_symbol(const char *name
,
1890 const struct kernel_symbol
*start
,
1891 const struct kernel_symbol
*stop
)
1893 const struct kernel_symbol
*ks
= start
;
1894 for (; ks
< stop
; ks
++)
1895 if (strcmp(ks
->name
, name
) == 0)
1900 static int is_exported(const char *name
, unsigned long value
,
1901 const struct module
*mod
)
1903 const struct kernel_symbol
*ks
;
1905 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
1907 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
1908 return ks
!= NULL
&& ks
->value
== value
;
1912 static char elf_type(const Elf_Sym
*sym
,
1914 const char *secstrings
,
1917 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1918 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1923 if (sym
->st_shndx
== SHN_UNDEF
)
1925 if (sym
->st_shndx
== SHN_ABS
)
1927 if (sym
->st_shndx
>= SHN_LORESERVE
)
1929 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1931 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1932 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1933 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1935 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1940 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1941 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1946 if (strstarts(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
, ".debug"))
1951 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
1954 const Elf_Shdr
*sec
;
1956 if (src
->st_shndx
== SHN_UNDEF
1957 || src
->st_shndx
>= shnum
1961 sec
= sechdrs
+ src
->st_shndx
;
1962 if (!(sec
->sh_flags
& SHF_ALLOC
)
1963 #ifndef CONFIG_KALLSYMS_ALL
1964 || !(sec
->sh_flags
& SHF_EXECINSTR
)
1966 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
1972 static unsigned long layout_symtab(struct module
*mod
,
1974 unsigned int symindex
,
1975 unsigned int strindex
,
1976 const Elf_Ehdr
*hdr
,
1977 const char *secstrings
,
1978 unsigned long *pstroffs
,
1979 unsigned long *strmap
)
1981 unsigned long symoffs
;
1982 Elf_Shdr
*symsect
= sechdrs
+ symindex
;
1983 Elf_Shdr
*strsect
= sechdrs
+ strindex
;
1986 unsigned int i
, nsrc
, ndst
;
1988 /* Put symbol section at end of init part of module. */
1989 symsect
->sh_flags
|= SHF_ALLOC
;
1990 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
1991 symindex
) | INIT_OFFSET_MASK
;
1992 DEBUGP("\t%s\n", secstrings
+ symsect
->sh_name
);
1994 src
= (void *)hdr
+ symsect
->sh_offset
;
1995 nsrc
= symsect
->sh_size
/ sizeof(*src
);
1996 strtab
= (void *)hdr
+ strsect
->sh_offset
;
1997 for (ndst
= i
= 1; i
< nsrc
; ++i
, ++src
)
1998 if (is_core_symbol(src
, sechdrs
, hdr
->e_shnum
)) {
1999 unsigned int j
= src
->st_name
;
2001 while(!__test_and_set_bit(j
, strmap
) && strtab
[j
])
2006 /* Append room for core symbols at end of core part. */
2007 symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
2008 mod
->core_size
= symoffs
+ ndst
* sizeof(Elf_Sym
);
2010 /* Put string table section at end of init part of module. */
2011 strsect
->sh_flags
|= SHF_ALLOC
;
2012 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
2013 strindex
) | INIT_OFFSET_MASK
;
2014 DEBUGP("\t%s\n", secstrings
+ strsect
->sh_name
);
2016 /* Append room for core symbols' strings at end of core part. */
2017 *pstroffs
= mod
->core_size
;
2018 __set_bit(0, strmap
);
2019 mod
->core_size
+= bitmap_weight(strmap
, strsect
->sh_size
);
2024 static void add_kallsyms(struct module
*mod
,
2027 unsigned int symindex
,
2028 unsigned int strindex
,
2029 unsigned long symoffs
,
2030 unsigned long stroffs
,
2031 const char *secstrings
,
2032 unsigned long *strmap
)
2034 unsigned int i
, ndst
;
2039 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
2040 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
2041 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
2043 /* Set types up while we still have access to sections. */
2044 for (i
= 0; i
< mod
->num_symtab
; i
++)
2045 mod
->symtab
[i
].st_info
2046 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
2048 mod
->core_symtab
= dst
= mod
->module_core
+ symoffs
;
2051 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
2052 if (!is_core_symbol(src
, sechdrs
, shnum
))
2055 dst
[ndst
].st_name
= bitmap_weight(strmap
, dst
[ndst
].st_name
);
2058 mod
->core_num_syms
= ndst
;
2060 mod
->core_strtab
= s
= mod
->module_core
+ stroffs
;
2061 for (*s
= 0, i
= 1; i
< sechdrs
[strindex
].sh_size
; ++i
)
2062 if (test_bit(i
, strmap
))
2063 *++s
= mod
->strtab
[i
];
2066 static inline unsigned long layout_symtab(struct module
*mod
,
2068 unsigned int symindex
,
2069 unsigned int strindex
,
2070 const Elf_Ehdr
*hdr
,
2071 const char *secstrings
,
2072 unsigned long *pstroffs
,
2073 unsigned long *strmap
)
2078 static inline void add_kallsyms(struct module
*mod
,
2081 unsigned int symindex
,
2082 unsigned int strindex
,
2083 unsigned long symoffs
,
2084 unsigned long stroffs
,
2085 const char *secstrings
,
2086 const unsigned long *strmap
)
2089 #endif /* CONFIG_KALLSYMS */
2091 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2093 #ifdef CONFIG_DYNAMIC_DEBUG
2094 if (ddebug_add_module(debug
, num
, debug
->modname
))
2095 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2100 static void dynamic_debug_remove(struct _ddebug
*debug
)
2103 ddebug_remove_module(debug
->modname
);
2106 static void *module_alloc_update_bounds(unsigned long size
)
2108 void *ret
= module_alloc(size
);
2111 mutex_lock(&module_mutex
);
2112 /* Update module bounds. */
2113 if ((unsigned long)ret
< module_addr_min
)
2114 module_addr_min
= (unsigned long)ret
;
2115 if ((unsigned long)ret
+ size
> module_addr_max
)
2116 module_addr_max
= (unsigned long)ret
+ size
;
2117 mutex_unlock(&module_mutex
);
2122 #ifdef CONFIG_DEBUG_KMEMLEAK
2123 static void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2124 const Elf_Shdr
*sechdrs
,
2125 const char *secstrings
)
2129 /* only scan the sections containing data */
2130 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2132 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2133 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2135 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".data", 5) != 0
2136 && strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) != 0)
2139 kmemleak_scan_area((void *)sechdrs
[i
].sh_addr
,
2140 sechdrs
[i
].sh_size
, GFP_KERNEL
);
2144 static inline void kmemleak_load_module(struct module
*mod
, Elf_Ehdr
*hdr
,
2146 const char *secstrings
)
2155 char *secstrings
, *args
, *strtab
;
2157 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
2161 static int copy_and_check(struct load_info
*info
, const void __user
*umod
, unsigned long len
)
2166 if (len
< sizeof(*hdr
))
2169 /* Suck in entire file: we'll want most of it. */
2170 /* vmalloc barfs on "unusual" numbers. Check here */
2171 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
2174 if (copy_from_user(hdr
, umod
, len
) != 0) {
2179 /* Sanity checks against insmoding binaries or wrong arch,
2180 weird elf version */
2181 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2182 || hdr
->e_type
!= ET_REL
2183 || !elf_check_arch(hdr
)
2184 || hdr
->e_shentsize
!= sizeof(Elf_Shdr
)) {
2189 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
)) {
2203 * Set up our basic convenience variables (pointers to section headers,
2204 * search for module section index etc), and do some basic section
2207 * Return the temporary module pointer (we'll replace it with the final
2208 * one when we move the module sections around).
2210 static struct module
*setup_load_info(struct load_info
*info
)
2215 /* Set up the convenience variables */
2216 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2217 info
->secstrings
= (void *)info
->hdr
+ info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2218 info
->sechdrs
[0].sh_addr
= 0;
2220 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2221 if (info
->sechdrs
[i
].sh_type
!= SHT_NOBITS
2222 && info
->len
< info
->sechdrs
[i
].sh_offset
+ info
->sechdrs
[i
].sh_size
)
2225 /* Mark all sections sh_addr with their address in the
2227 info
->sechdrs
[i
].sh_addr
= (size_t)info
->hdr
+ info
->sechdrs
[i
].sh_offset
;
2229 /* Internal symbols and strings. */
2230 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2231 info
->index
.sym
= i
;
2232 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2233 info
->strtab
= (char *)info
->hdr
+ info
->sechdrs
[info
->index
.str
].sh_offset
;
2235 #ifndef CONFIG_MODULE_UNLOAD
2236 /* Don't load .exit sections */
2237 if (strstarts(info
->secstrings
+info
->sechdrs
[i
].sh_name
, ".exit"))
2238 info
->sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2242 info
->index
.mod
= find_sec(info
->hdr
, info
->sechdrs
, info
->secstrings
,
2243 ".gnu.linkonce.this_module");
2244 if (!info
->index
.mod
) {
2245 printk(KERN_WARNING
"No module found in object\n");
2246 return ERR_PTR(-ENOEXEC
);
2248 /* This is temporary: point mod into copy of data. */
2249 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2251 if (info
->index
.sym
== 0) {
2252 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2254 return ERR_PTR(-ENOEXEC
);
2257 info
->index
.vers
= find_sec(info
->hdr
, info
->sechdrs
, info
->secstrings
, "__versions");
2258 info
->index
.info
= find_sec(info
->hdr
, info
->sechdrs
, info
->secstrings
, ".modinfo");
2259 info
->index
.pcpu
= find_pcpusec(info
->hdr
, info
->sechdrs
, info
->secstrings
);
2261 /* Don't keep modinfo and version sections. */
2262 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2263 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2265 /* Check module struct version now, before we try to use module. */
2266 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2267 return ERR_PTR(-ENOEXEC
);
2272 printk(KERN_ERR
"Module len %lu truncated\n", info
->len
);
2273 return ERR_PTR(-ENOEXEC
);
2276 static int check_modinfo(struct module
*mod
,
2277 const Elf_Shdr
*sechdrs
,
2278 unsigned int infoindex
, unsigned int versindex
)
2280 const char *modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
2283 /* This is allowed: modprobe --force will invalidate it. */
2285 err
= try_to_force_load(mod
, "bad vermagic");
2288 } else if (!same_magic(modmagic
, vermagic
, versindex
)) {
2289 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2290 mod
->name
, modmagic
, vermagic
);
2294 if (get_modinfo(sechdrs
, infoindex
, "staging")) {
2295 add_taint_module(mod
, TAINT_CRAP
);
2296 printk(KERN_WARNING
"%s: module is from the staging directory,"
2297 " the quality is unknown, you have been warned.\n",
2301 /* Set up license info based on the info section */
2302 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
2307 static void find_module_sections(struct module
*mod
, Elf_Ehdr
*hdr
,
2308 Elf_Shdr
*sechdrs
, const char *secstrings
)
2310 mod
->kp
= section_objs(hdr
, sechdrs
, secstrings
, "__param",
2311 sizeof(*mod
->kp
), &mod
->num_kp
);
2312 mod
->syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab",
2313 sizeof(*mod
->syms
), &mod
->num_syms
);
2314 mod
->crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab");
2315 mod
->gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl",
2316 sizeof(*mod
->gpl_syms
),
2317 &mod
->num_gpl_syms
);
2318 mod
->gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
2319 mod
->gpl_future_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2320 "__ksymtab_gpl_future",
2321 sizeof(*mod
->gpl_future_syms
),
2322 &mod
->num_gpl_future_syms
);
2323 mod
->gpl_future_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2324 "__kcrctab_gpl_future");
2326 #ifdef CONFIG_UNUSED_SYMBOLS
2327 mod
->unused_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2329 sizeof(*mod
->unused_syms
),
2330 &mod
->num_unused_syms
);
2331 mod
->unused_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2332 "__kcrctab_unused");
2333 mod
->unused_gpl_syms
= section_objs(hdr
, sechdrs
, secstrings
,
2334 "__ksymtab_unused_gpl",
2335 sizeof(*mod
->unused_gpl_syms
),
2336 &mod
->num_unused_gpl_syms
);
2337 mod
->unused_gpl_crcs
= section_addr(hdr
, sechdrs
, secstrings
,
2338 "__kcrctab_unused_gpl");
2340 #ifdef CONFIG_CONSTRUCTORS
2341 mod
->ctors
= section_objs(hdr
, sechdrs
, secstrings
, ".ctors",
2342 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2345 #ifdef CONFIG_TRACEPOINTS
2346 mod
->tracepoints
= section_objs(hdr
, sechdrs
, secstrings
,
2348 sizeof(*mod
->tracepoints
),
2349 &mod
->num_tracepoints
);
2351 #ifdef CONFIG_EVENT_TRACING
2352 mod
->trace_events
= section_objs(hdr
, sechdrs
, secstrings
,
2354 sizeof(*mod
->trace_events
),
2355 &mod
->num_trace_events
);
2357 * This section contains pointers to allocated objects in the trace
2358 * code and not scanning it leads to false positives.
2360 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2361 mod
->num_trace_events
, GFP_KERNEL
);
2363 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2364 /* sechdrs[0].sh_size is always zero */
2365 mod
->ftrace_callsites
= section_objs(hdr
, sechdrs
, secstrings
,
2367 sizeof(*mod
->ftrace_callsites
),
2368 &mod
->num_ftrace_callsites
);
2371 if (section_addr(hdr
, sechdrs
, secstrings
, "__obsparm"))
2372 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2376 static struct module
*move_module(struct module
*mod
,
2377 Elf_Ehdr
*hdr
, Elf_Shdr
*sechdrs
,
2378 const char *secstrings
, unsigned modindex
)
2383 /* Do the allocs. */
2384 ptr
= module_alloc_update_bounds(mod
->core_size
);
2386 * The pointer to this block is stored in the module structure
2387 * which is inside the block. Just mark it as not being a
2390 kmemleak_not_leak(ptr
);
2392 return ERR_PTR(-ENOMEM
);
2394 memset(ptr
, 0, mod
->core_size
);
2395 mod
->module_core
= ptr
;
2397 ptr
= module_alloc_update_bounds(mod
->init_size
);
2399 * The pointer to this block is stored in the module structure
2400 * which is inside the block. This block doesn't need to be
2401 * scanned as it contains data and code that will be freed
2402 * after the module is initialized.
2404 kmemleak_ignore(ptr
);
2405 if (!ptr
&& mod
->init_size
) {
2406 module_free(mod
, mod
->module_core
);
2407 return ERR_PTR(-ENOMEM
);
2409 memset(ptr
, 0, mod
->init_size
);
2410 mod
->module_init
= ptr
;
2412 /* Transfer each section which specifies SHF_ALLOC */
2413 DEBUGP("final section addresses:\n");
2414 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
2417 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2420 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
2421 dest
= mod
->module_init
2422 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
2424 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
2426 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
2427 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
2428 sechdrs
[i
].sh_size
);
2429 /* Update sh_addr to point to copy in image. */
2430 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
2431 DEBUGP("\t0x%lx %s\n",
2432 sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
2434 /* Module has been moved. */
2435 mod
= (void *)sechdrs
[modindex
].sh_addr
;
2436 kmemleak_load_module(mod
, hdr
, sechdrs
, secstrings
);
2440 static int check_module_license_and_versions(struct module
*mod
,
2444 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2445 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2446 * using GPL-only symbols it needs.
2448 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2449 add_taint(TAINT_PROPRIETARY_MODULE
);
2451 /* driverloader was caught wrongly pretending to be under GPL */
2452 if (strcmp(mod
->name
, "driverloader") == 0)
2453 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2455 #ifdef CONFIG_MODVERSIONS
2456 if ((mod
->num_syms
&& !mod
->crcs
)
2457 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2458 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2459 #ifdef CONFIG_UNUSED_SYMBOLS
2460 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2461 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2464 return try_to_force_load(mod
,
2465 "no versions for exported symbols");
2471 static void flush_module_icache(const struct module
*mod
)
2473 mm_segment_t old_fs
;
2475 /* flush the icache in correct context */
2480 * Flush the instruction cache, since we've played with text.
2481 * Do it before processing of module parameters, so the module
2482 * can provide parameter accessor functions of its own.
2484 if (mod
->module_init
)
2485 flush_icache_range((unsigned long)mod
->module_init
,
2486 (unsigned long)mod
->module_init
2488 flush_icache_range((unsigned long)mod
->module_core
,
2489 (unsigned long)mod
->module_core
+ mod
->core_size
);
2494 /* Allocate and load the module: note that size of section 0 is always
2495 zero, and we rely on this for optional sections. */
2496 static noinline
struct module
*load_module(void __user
*umod
,
2498 const char __user
*uargs
)
2500 struct load_info info
= { NULL
, };
2503 unsigned long symoffs
, stroffs
, *strmap
;
2504 void __percpu
*percpu
;
2505 struct _ddebug
*debug
= NULL
;
2506 unsigned int num_debug
= 0;
2508 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2511 err
= copy_and_check(&info
, umod
, len
);
2513 return ERR_PTR(err
);
2515 mod
= setup_load_info(&info
);
2521 err
= check_modinfo(mod
, info
.sechdrs
, info
.index
.info
, info
.index
.vers
);
2525 /* Now copy in args */
2526 info
.args
= strndup_user(uargs
, ~0UL >> 1);
2527 if (IS_ERR(info
.args
)) {
2528 err
= PTR_ERR(info
.args
);
2532 strmap
= kzalloc(BITS_TO_LONGS(info
.sechdrs
[info
.index
.str
].sh_size
)
2533 * sizeof(long), GFP_KERNEL
);
2539 mod
->state
= MODULE_STATE_COMING
;
2541 /* Allow arches to frob section contents and sizes. */
2542 err
= module_frob_arch_sections(info
.hdr
, info
.sechdrs
, info
.secstrings
, mod
);
2546 if (info
.index
.pcpu
) {
2547 /* We have a special allocation for this section. */
2548 err
= percpu_modalloc(mod
, info
.sechdrs
[info
.index
.pcpu
].sh_size
,
2549 info
.sechdrs
[info
.index
.pcpu
].sh_addralign
);
2552 info
.sechdrs
[info
.index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2554 /* Keep this around for failure path. */
2555 percpu
= mod_percpu(mod
);
2557 /* Determine total sizes, and put offsets in sh_entsize. For now
2558 this is done generically; there doesn't appear to be any
2559 special cases for the architectures. */
2560 layout_sections(mod
, info
.hdr
, info
.sechdrs
, info
.secstrings
);
2561 symoffs
= layout_symtab(mod
, info
.sechdrs
, info
.index
.sym
, info
.index
.str
, info
.hdr
,
2562 info
.secstrings
, &stroffs
, strmap
);
2564 /* Allocate and move to the final place */
2565 mod
= move_module(mod
, info
.hdr
, info
.sechdrs
, info
.secstrings
, info
.index
.mod
);
2571 /* Now we've moved module, initialize linked lists, etc. */
2572 err
= module_unload_init(mod
);
2576 /* Now we've got everything in the final locations, we can
2577 * find optional sections. */
2578 find_module_sections(mod
, info
.hdr
, info
.sechdrs
, info
.secstrings
);
2580 err
= check_module_license_and_versions(mod
, info
.sechdrs
);
2584 /* Set up MODINFO_ATTR fields */
2585 setup_modinfo(mod
, info
.sechdrs
, info
.index
.info
);
2587 /* Fix up syms, so that st_value is a pointer to location. */
2588 err
= simplify_symbols(info
.sechdrs
, info
.index
.sym
, info
.strtab
, info
.index
.vers
, info
.index
.pcpu
,
2593 err
= apply_relocations(mod
, info
.hdr
, info
.sechdrs
, info
.index
.sym
, info
.index
.str
);
2597 /* Set up and sort exception table */
2598 mod
->extable
= section_objs(info
.hdr
, info
.sechdrs
, info
.secstrings
, "__ex_table",
2599 sizeof(*mod
->extable
), &mod
->num_exentries
);
2600 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2602 /* Finally, copy percpu area over. */
2603 percpu_modcopy(mod
, (void *)info
.sechdrs
[info
.index
.pcpu
].sh_addr
,
2604 info
.sechdrs
[info
.index
.pcpu
].sh_size
);
2606 add_kallsyms(mod
, info
.sechdrs
, info
.hdr
->e_shnum
, info
.index
.sym
, info
.index
.str
,
2607 symoffs
, stroffs
, info
.secstrings
, strmap
);
2612 debug
= section_objs(info
.hdr
, info
.sechdrs
, info
.secstrings
, "__verbose",
2613 sizeof(*debug
), &num_debug
);
2615 err
= module_finalize(info
.hdr
, info
.sechdrs
, mod
);
2619 flush_module_icache(mod
);
2621 mod
->args
= info
.args
;
2623 /* Now sew it into the lists so we can get lockdep and oops
2624 * info during argument parsing. Noone should access us, since
2625 * strong_try_module_get() will fail.
2626 * lockdep/oops can run asynchronous, so use the RCU list insertion
2627 * function to insert in a way safe to concurrent readers.
2628 * The mutex protects against concurrent writers.
2630 mutex_lock(&module_mutex
);
2631 if (find_module(mod
->name
)) {
2637 dynamic_debug_setup(debug
, num_debug
);
2639 /* Find duplicate symbols */
2640 err
= verify_export_symbols(mod
);
2644 list_add_rcu(&mod
->list
, &modules
);
2645 mutex_unlock(&module_mutex
);
2647 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
, NULL
);
2651 err
= mod_sysfs_setup(mod
, mod
->kp
, mod
->num_kp
);
2655 add_sect_attrs(mod
, info
.hdr
->e_shnum
, info
.secstrings
, info
.sechdrs
);
2656 add_notes_attrs(mod
, info
.hdr
->e_shnum
, info
.secstrings
, info
.sechdrs
);
2658 /* Get rid of temporary copy */
2661 trace_module_load(mod
);
2667 mutex_lock(&module_mutex
);
2668 /* Unlink carefully: kallsyms could be walking list. */
2669 list_del_rcu(&mod
->list
);
2671 dynamic_debug_remove(debug
);
2673 mutex_unlock(&module_mutex
);
2674 synchronize_sched();
2675 module_arch_cleanup(mod
);
2679 module_unload_free(mod
);
2681 module_free(mod
, mod
->module_init
);
2682 module_free(mod
, mod
->module_core
);
2683 /* mod will be freed with core. Don't access it beyond this line! */
2685 free_percpu(percpu
);
2691 return ERR_PTR(err
);
2694 /* Call module constructors. */
2695 static void do_mod_ctors(struct module
*mod
)
2697 #ifdef CONFIG_CONSTRUCTORS
2700 for (i
= 0; i
< mod
->num_ctors
; i
++)
2705 /* This is where the real work happens */
2706 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
2707 unsigned long, len
, const char __user
*, uargs
)
2712 /* Must have permission */
2713 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
2716 /* Do all the hard work */
2717 mod
= load_module(umod
, len
, uargs
);
2719 return PTR_ERR(mod
);
2721 blocking_notifier_call_chain(&module_notify_list
,
2722 MODULE_STATE_COMING
, mod
);
2725 /* Start the module */
2726 if (mod
->init
!= NULL
)
2727 ret
= do_one_initcall(mod
->init
);
2729 /* Init routine failed: abort. Try to protect us from
2730 buggy refcounters. */
2731 mod
->state
= MODULE_STATE_GOING
;
2732 synchronize_sched();
2734 blocking_notifier_call_chain(&module_notify_list
,
2735 MODULE_STATE_GOING
, mod
);
2737 wake_up(&module_wq
);
2742 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2743 "%s: loading module anyway...\n",
2744 __func__
, mod
->name
, ret
,
2749 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2750 mod
->state
= MODULE_STATE_LIVE
;
2751 wake_up(&module_wq
);
2752 blocking_notifier_call_chain(&module_notify_list
,
2753 MODULE_STATE_LIVE
, mod
);
2755 /* We need to finish all async code before the module init sequence is done */
2756 async_synchronize_full();
2758 mutex_lock(&module_mutex
);
2759 /* Drop initial reference. */
2761 trim_init_extable(mod
);
2762 #ifdef CONFIG_KALLSYMS
2763 mod
->num_symtab
= mod
->core_num_syms
;
2764 mod
->symtab
= mod
->core_symtab
;
2765 mod
->strtab
= mod
->core_strtab
;
2767 module_free(mod
, mod
->module_init
);
2768 mod
->module_init
= NULL
;
2770 mod
->init_text_size
= 0;
2771 mutex_unlock(&module_mutex
);
2776 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2778 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2781 #ifdef CONFIG_KALLSYMS
2783 * This ignores the intensely annoying "mapping symbols" found
2784 * in ARM ELF files: $a, $t and $d.
2786 static inline int is_arm_mapping_symbol(const char *str
)
2788 return str
[0] == '$' && strchr("atd", str
[1])
2789 && (str
[2] == '\0' || str
[2] == '.');
2792 static const char *get_ksymbol(struct module
*mod
,
2794 unsigned long *size
,
2795 unsigned long *offset
)
2797 unsigned int i
, best
= 0;
2798 unsigned long nextval
;
2800 /* At worse, next value is at end of module */
2801 if (within_module_init(addr
, mod
))
2802 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2804 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2806 /* Scan for closest preceeding symbol, and next symbol. (ELF
2807 starts real symbols at 1). */
2808 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2809 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2812 /* We ignore unnamed symbols: they're uninformative
2813 * and inserted at a whim. */
2814 if (mod
->symtab
[i
].st_value
<= addr
2815 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2816 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2817 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2819 if (mod
->symtab
[i
].st_value
> addr
2820 && mod
->symtab
[i
].st_value
< nextval
2821 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2822 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2823 nextval
= mod
->symtab
[i
].st_value
;
2830 *size
= nextval
- mod
->symtab
[best
].st_value
;
2832 *offset
= addr
- mod
->symtab
[best
].st_value
;
2833 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2836 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2837 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2838 const char *module_address_lookup(unsigned long addr
,
2839 unsigned long *size
,
2840 unsigned long *offset
,
2845 const char *ret
= NULL
;
2848 list_for_each_entry_rcu(mod
, &modules
, list
) {
2849 if (within_module_init(addr
, mod
) ||
2850 within_module_core(addr
, mod
)) {
2852 *modname
= mod
->name
;
2853 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2857 /* Make a copy in here where it's safe */
2859 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2866 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2871 list_for_each_entry_rcu(mod
, &modules
, list
) {
2872 if (within_module_init(addr
, mod
) ||
2873 within_module_core(addr
, mod
)) {
2876 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2879 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2889 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2890 unsigned long *offset
, char *modname
, char *name
)
2895 list_for_each_entry_rcu(mod
, &modules
, list
) {
2896 if (within_module_init(addr
, mod
) ||
2897 within_module_core(addr
, mod
)) {
2900 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2904 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2906 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2916 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2917 char *name
, char *module_name
, int *exported
)
2922 list_for_each_entry_rcu(mod
, &modules
, list
) {
2923 if (symnum
< mod
->num_symtab
) {
2924 *value
= mod
->symtab
[symnum
].st_value
;
2925 *type
= mod
->symtab
[symnum
].st_info
;
2926 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2928 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2929 *exported
= is_exported(name
, *value
, mod
);
2933 symnum
-= mod
->num_symtab
;
2939 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2943 for (i
= 0; i
< mod
->num_symtab
; i
++)
2944 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2945 mod
->symtab
[i
].st_info
!= 'U')
2946 return mod
->symtab
[i
].st_value
;
2950 /* Look for this name: can be of form module:name. */
2951 unsigned long module_kallsyms_lookup_name(const char *name
)
2955 unsigned long ret
= 0;
2957 /* Don't lock: we're in enough trouble already. */
2959 if ((colon
= strchr(name
, ':')) != NULL
) {
2961 if ((mod
= find_module(name
)) != NULL
)
2962 ret
= mod_find_symname(mod
, colon
+1);
2965 list_for_each_entry_rcu(mod
, &modules
, list
)
2966 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2973 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
2974 struct module
*, unsigned long),
2981 list_for_each_entry(mod
, &modules
, list
) {
2982 for (i
= 0; i
< mod
->num_symtab
; i
++) {
2983 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
2984 mod
, mod
->symtab
[i
].st_value
);
2991 #endif /* CONFIG_KALLSYMS */
2993 static char *module_flags(struct module
*mod
, char *buf
)
2998 mod
->state
== MODULE_STATE_GOING
||
2999 mod
->state
== MODULE_STATE_COMING
) {
3001 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
3003 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
3005 if (mod
->taints
& (1 << TAINT_CRAP
))
3008 * TAINT_FORCED_RMMOD: could be added.
3009 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
3013 /* Show a - for module-is-being-unloaded */
3014 if (mod
->state
== MODULE_STATE_GOING
)
3016 /* Show a + for module-is-being-loaded */
3017 if (mod
->state
== MODULE_STATE_COMING
)
3026 #ifdef CONFIG_PROC_FS
3027 /* Called by the /proc file system to return a list of modules. */
3028 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3030 mutex_lock(&module_mutex
);
3031 return seq_list_start(&modules
, *pos
);
3034 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3036 return seq_list_next(p
, &modules
, pos
);
3039 static void m_stop(struct seq_file
*m
, void *p
)
3041 mutex_unlock(&module_mutex
);
3044 static int m_show(struct seq_file
*m
, void *p
)
3046 struct module
*mod
= list_entry(p
, struct module
, list
);
3049 seq_printf(m
, "%s %u",
3050 mod
->name
, mod
->init_size
+ mod
->core_size
);
3051 print_unload_info(m
, mod
);
3053 /* Informative for users. */
3054 seq_printf(m
, " %s",
3055 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3056 mod
->state
== MODULE_STATE_COMING
? "Loading":
3058 /* Used by oprofile and other similar tools. */
3059 seq_printf(m
, " 0x%p", mod
->module_core
);
3063 seq_printf(m
, " %s", module_flags(mod
, buf
));
3065 seq_printf(m
, "\n");
3069 /* Format: modulename size refcount deps address
3071 Where refcount is a number or -, and deps is a comma-separated list
3074 static const struct seq_operations modules_op
= {
3081 static int modules_open(struct inode
*inode
, struct file
*file
)
3083 return seq_open(file
, &modules_op
);
3086 static const struct file_operations proc_modules_operations
= {
3087 .open
= modules_open
,
3089 .llseek
= seq_lseek
,
3090 .release
= seq_release
,
3093 static int __init
proc_modules_init(void)
3095 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3098 module_init(proc_modules_init
);
3101 /* Given an address, look for it in the module exception tables. */
3102 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3104 const struct exception_table_entry
*e
= NULL
;
3108 list_for_each_entry_rcu(mod
, &modules
, list
) {
3109 if (mod
->num_exentries
== 0)
3112 e
= search_extable(mod
->extable
,
3113 mod
->extable
+ mod
->num_exentries
- 1,
3120 /* Now, if we found one, we are running inside it now, hence
3121 we cannot unload the module, hence no refcnt needed. */
3126 * is_module_address - is this address inside a module?
3127 * @addr: the address to check.
3129 * See is_module_text_address() if you simply want to see if the address
3130 * is code (not data).
3132 bool is_module_address(unsigned long addr
)
3137 ret
= __module_address(addr
) != NULL
;
3144 * __module_address - get the module which contains an address.
3145 * @addr: the address.
3147 * Must be called with preempt disabled or module mutex held so that
3148 * module doesn't get freed during this.
3150 struct module
*__module_address(unsigned long addr
)
3154 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3157 list_for_each_entry_rcu(mod
, &modules
, list
)
3158 if (within_module_core(addr
, mod
)
3159 || within_module_init(addr
, mod
))
3163 EXPORT_SYMBOL_GPL(__module_address
);
3166 * is_module_text_address - is this address inside module code?
3167 * @addr: the address to check.
3169 * See is_module_address() if you simply want to see if the address is
3170 * anywhere in a module. See kernel_text_address() for testing if an
3171 * address corresponds to kernel or module code.
3173 bool is_module_text_address(unsigned long addr
)
3178 ret
= __module_text_address(addr
) != NULL
;
3185 * __module_text_address - get the module whose code contains an address.
3186 * @addr: the address.
3188 * Must be called with preempt disabled or module mutex held so that
3189 * module doesn't get freed during this.
3191 struct module
*__module_text_address(unsigned long addr
)
3193 struct module
*mod
= __module_address(addr
);
3195 /* Make sure it's within the text section. */
3196 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3197 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3202 EXPORT_SYMBOL_GPL(__module_text_address
);
3204 /* Don't grab lock, we're oopsing. */
3205 void print_modules(void)
3210 printk(KERN_DEFAULT
"Modules linked in:");
3211 /* Most callers should already have preempt disabled, but make sure */
3213 list_for_each_entry_rcu(mod
, &modules
, list
)
3214 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3216 if (last_unloaded_module
[0])
3217 printk(" [last unloaded: %s]", last_unloaded_module
);
3221 #ifdef CONFIG_MODVERSIONS
3222 /* Generate the signature for all relevant module structures here.
3223 * If these change, we don't want to try to parse the module. */
3224 void module_layout(struct module
*mod
,
3225 struct modversion_info
*ver
,
3226 struct kernel_param
*kp
,
3227 struct kernel_symbol
*ks
,
3228 struct tracepoint
*tp
)
3231 EXPORT_SYMBOL(module_layout
);
3234 #ifdef CONFIG_TRACEPOINTS
3235 void module_update_tracepoints(void)
3239 mutex_lock(&module_mutex
);
3240 list_for_each_entry(mod
, &modules
, list
)
3242 tracepoint_update_probe_range(mod
->tracepoints
,
3243 mod
->tracepoints
+ mod
->num_tracepoints
);
3244 mutex_unlock(&module_mutex
);
3248 * Returns 0 if current not found.
3249 * Returns 1 if current found.
3251 int module_get_iter_tracepoints(struct tracepoint_iter
*iter
)
3253 struct module
*iter_mod
;
3256 mutex_lock(&module_mutex
);
3257 list_for_each_entry(iter_mod
, &modules
, list
) {
3258 if (!iter_mod
->taints
) {
3260 * Sorted module list
3262 if (iter_mod
< iter
->module
)
3264 else if (iter_mod
> iter
->module
)
3265 iter
->tracepoint
= NULL
;
3266 found
= tracepoint_get_iter_range(&iter
->tracepoint
,
3267 iter_mod
->tracepoints
,
3268 iter_mod
->tracepoints
3269 + iter_mod
->num_tracepoints
);
3271 iter
->module
= iter_mod
;
3276 mutex_unlock(&module_mutex
);