2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002, 2010 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/export.h>
20 #include <linux/moduleloader.h>
21 #include <linux/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
24 #include <linux/file.h>
26 #include <linux/sysfs.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/vmalloc.h>
30 #include <linux/elf.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/seq_file.h>
34 #include <linux/syscalls.h>
35 #include <linux/fcntl.h>
36 #include <linux/rcupdate.h>
37 #include <linux/capability.h>
38 #include <linux/cpu.h>
39 #include <linux/moduleparam.h>
40 #include <linux/errno.h>
41 #include <linux/err.h>
42 #include <linux/vermagic.h>
43 #include <linux/notifier.h>
44 #include <linux/sched.h>
45 #include <linux/stop_machine.h>
46 #include <linux/device.h>
47 #include <linux/string.h>
48 #include <linux/mutex.h>
49 #include <linux/rculist.h>
50 #include <asm/uaccess.h>
51 #include <asm/cacheflush.h>
52 #include <asm/mmu_context.h>
53 #include <linux/license.h>
54 #include <asm/sections.h>
55 #include <linux/tracepoint.h>
56 #include <linux/ftrace.h>
57 #include <linux/async.h>
58 #include <linux/percpu.h>
59 #include <linux/kmemleak.h>
60 #include <linux/jump_label.h>
61 #include <linux/pfn.h>
62 #include <linux/bsearch.h>
63 #include <linux/fips.h>
64 #include <uapi/linux/module.h>
65 #include "module-internal.h"
67 #define CREATE_TRACE_POINTS
68 #include <trace/events/module.h>
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
75 * Modules' sections will be aligned on page boundaries
76 * to ensure complete separation of code and data, but
77 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
79 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
80 # define debug_align(X) ALIGN(X, PAGE_SIZE)
82 # define debug_align(X) (X)
86 * Given BASE and SIZE this macro calculates the number of pages the
87 * memory regions occupies
89 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
90 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
91 PFN_DOWN((unsigned long)BASE) + 1) \
94 /* If this is set, the section belongs in the init part of the module */
95 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
99 * 1) List of modules (also safely readable with preempt_disable),
100 * 2) module_use links,
101 * 3) module_addr_min/module_addr_max.
102 * (delete uses stop_machine/add uses RCU list operations). */
103 DEFINE_MUTEX(module_mutex
);
104 EXPORT_SYMBOL_GPL(module_mutex
);
105 static LIST_HEAD(modules
);
106 #ifdef CONFIG_KGDB_KDB
107 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
108 #endif /* CONFIG_KGDB_KDB */
110 #ifdef CONFIG_MODULE_SIG
111 #ifdef CONFIG_MODULE_SIG_FORCE
112 static bool sig_enforce
= true;
114 static bool sig_enforce
= false;
116 static int param_set_bool_enable_only(const char *val
,
117 const struct kernel_param
*kp
)
121 struct kernel_param dummy_kp
= *kp
;
123 dummy_kp
.arg
= &test
;
125 err
= param_set_bool(val
, &dummy_kp
);
129 /* Don't let them unset it once it's set! */
130 if (!test
&& sig_enforce
)
138 static const struct kernel_param_ops param_ops_bool_enable_only
= {
139 .set
= param_set_bool_enable_only
,
140 .get
= param_get_bool
,
142 #define param_check_bool_enable_only param_check_bool
144 module_param(sig_enforce
, bool_enable_only
, 0644);
145 #endif /* !CONFIG_MODULE_SIG_FORCE */
146 #endif /* CONFIG_MODULE_SIG */
148 /* Block module loading/unloading? */
149 int modules_disabled
= 0;
150 core_param(nomodule
, modules_disabled
, bint
, 0);
152 /* Waiting for a module to finish initializing? */
153 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
155 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
157 /* Bounds of module allocation, for speeding __module_address.
158 * Protected by module_mutex. */
159 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
161 int register_module_notifier(struct notifier_block
* nb
)
163 return blocking_notifier_chain_register(&module_notify_list
, nb
);
165 EXPORT_SYMBOL(register_module_notifier
);
167 int unregister_module_notifier(struct notifier_block
* nb
)
169 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
171 EXPORT_SYMBOL(unregister_module_notifier
);
177 char *secstrings
, *strtab
;
178 unsigned long symoffs
, stroffs
;
179 struct _ddebug
*debug
;
180 unsigned int num_debug
;
183 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
187 /* We require a truly strong try_module_get(): 0 means failure due to
188 ongoing or failed initialization etc. */
189 static inline int strong_try_module_get(struct module
*mod
)
191 BUG_ON(mod
&& mod
->state
== MODULE_STATE_UNFORMED
);
192 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
194 if (try_module_get(mod
))
200 static inline void add_taint_module(struct module
*mod
, unsigned flag
,
201 enum lockdep_ok lockdep_ok
)
203 add_taint(flag
, lockdep_ok
);
204 mod
->taints
|= (1U << flag
);
208 * A thread that wants to hold a reference to a module only while it
209 * is running can call this to safely exit. nfsd and lockd use this.
211 void __module_put_and_exit(struct module
*mod
, long code
)
216 EXPORT_SYMBOL(__module_put_and_exit
);
218 /* Find a module section: 0 means not found. */
219 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
223 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
224 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
225 /* Alloc bit cleared means "ignore it." */
226 if ((shdr
->sh_flags
& SHF_ALLOC
)
227 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
233 /* Find a module section, or NULL. */
234 static void *section_addr(const struct load_info
*info
, const char *name
)
236 /* Section 0 has sh_addr 0. */
237 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
240 /* Find a module section, or NULL. Fill in number of "objects" in section. */
241 static void *section_objs(const struct load_info
*info
,
246 unsigned int sec
= find_sec(info
, name
);
248 /* Section 0 has sh_addr 0 and sh_size 0. */
249 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
250 return (void *)info
->sechdrs
[sec
].sh_addr
;
253 /* Provided by the linker */
254 extern const struct kernel_symbol __start___ksymtab
[];
255 extern const struct kernel_symbol __stop___ksymtab
[];
256 extern const struct kernel_symbol __start___ksymtab_gpl
[];
257 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
258 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
259 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
260 extern const unsigned long __start___kcrctab
[];
261 extern const unsigned long __start___kcrctab_gpl
[];
262 extern const unsigned long __start___kcrctab_gpl_future
[];
263 #ifdef CONFIG_UNUSED_SYMBOLS
264 extern const struct kernel_symbol __start___ksymtab_unused
[];
265 extern const struct kernel_symbol __stop___ksymtab_unused
[];
266 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
267 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
268 extern const unsigned long __start___kcrctab_unused
[];
269 extern const unsigned long __start___kcrctab_unused_gpl
[];
272 #ifndef CONFIG_MODVERSIONS
273 #define symversion(base, idx) NULL
275 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
278 static bool each_symbol_in_section(const struct symsearch
*arr
,
279 unsigned int arrsize
,
280 struct module
*owner
,
281 bool (*fn
)(const struct symsearch
*syms
,
282 struct module
*owner
,
288 for (j
= 0; j
< arrsize
; j
++) {
289 if (fn(&arr
[j
], owner
, data
))
296 /* Returns true as soon as fn returns true, otherwise false. */
297 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
298 struct module
*owner
,
303 static const struct symsearch arr
[] = {
304 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
305 NOT_GPL_ONLY
, false },
306 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
307 __start___kcrctab_gpl
,
309 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
310 __start___kcrctab_gpl_future
,
311 WILL_BE_GPL_ONLY
, false },
312 #ifdef CONFIG_UNUSED_SYMBOLS
313 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
314 __start___kcrctab_unused
,
315 NOT_GPL_ONLY
, true },
316 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
317 __start___kcrctab_unused_gpl
,
322 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
325 list_for_each_entry_rcu(mod
, &modules
, list
) {
326 struct symsearch arr
[] = {
327 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
328 NOT_GPL_ONLY
, false },
329 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
332 { mod
->gpl_future_syms
,
333 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
334 mod
->gpl_future_crcs
,
335 WILL_BE_GPL_ONLY
, false },
336 #ifdef CONFIG_UNUSED_SYMBOLS
338 mod
->unused_syms
+ mod
->num_unused_syms
,
340 NOT_GPL_ONLY
, true },
341 { mod
->unused_gpl_syms
,
342 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
343 mod
->unused_gpl_crcs
,
348 if (mod
->state
== MODULE_STATE_UNFORMED
)
351 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
356 EXPORT_SYMBOL_GPL(each_symbol_section
);
358 struct find_symbol_arg
{
365 struct module
*owner
;
366 const unsigned long *crc
;
367 const struct kernel_symbol
*sym
;
370 static bool check_symbol(const struct symsearch
*syms
,
371 struct module
*owner
,
372 unsigned int symnum
, void *data
)
374 struct find_symbol_arg
*fsa
= data
;
377 if (syms
->licence
== GPL_ONLY
)
379 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
380 printk(KERN_WARNING
"Symbol %s is being used "
381 "by a non-GPL module, which will not "
382 "be allowed in the future\n", fsa
->name
);
386 #ifdef CONFIG_UNUSED_SYMBOLS
387 if (syms
->unused
&& fsa
->warn
) {
388 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
389 "however this module is using it.\n", fsa
->name
);
391 "This symbol will go away in the future.\n");
393 "Please evalute if this is the right api to use and if "
394 "it really is, submit a report the linux kernel "
395 "mailinglist together with submitting your code for "
401 fsa
->crc
= symversion(syms
->crcs
, symnum
);
402 fsa
->sym
= &syms
->start
[symnum
];
406 static int cmp_name(const void *va
, const void *vb
)
409 const struct kernel_symbol
*b
;
411 return strcmp(a
, b
->name
);
414 static bool find_symbol_in_section(const struct symsearch
*syms
,
415 struct module
*owner
,
418 struct find_symbol_arg
*fsa
= data
;
419 struct kernel_symbol
*sym
;
421 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
422 sizeof(struct kernel_symbol
), cmp_name
);
424 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
430 /* Find a symbol and return it, along with, (optional) crc and
431 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
432 const struct kernel_symbol
*find_symbol(const char *name
,
433 struct module
**owner
,
434 const unsigned long **crc
,
438 struct find_symbol_arg fsa
;
444 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
452 pr_debug("Failed to find symbol %s\n", name
);
455 EXPORT_SYMBOL_GPL(find_symbol
);
457 /* Search for module by name: must hold module_mutex. */
458 static struct module
*find_module_all(const char *name
,
463 list_for_each_entry(mod
, &modules
, list
) {
464 if (!even_unformed
&& mod
->state
== MODULE_STATE_UNFORMED
)
466 if (strcmp(mod
->name
, name
) == 0)
472 struct module
*find_module(const char *name
)
474 return find_module_all(name
, false);
476 EXPORT_SYMBOL_GPL(find_module
);
480 static inline void __percpu
*mod_percpu(struct module
*mod
)
485 static int percpu_modalloc(struct module
*mod
,
486 unsigned long size
, unsigned long align
)
488 if (align
> PAGE_SIZE
) {
489 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
490 mod
->name
, align
, PAGE_SIZE
);
494 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
497 "%s: Could not allocate %lu bytes percpu data\n",
501 mod
->percpu_size
= size
;
505 static void percpu_modfree(struct module
*mod
)
507 free_percpu(mod
->percpu
);
510 static unsigned int find_pcpusec(struct load_info
*info
)
512 return find_sec(info
, ".data..percpu");
515 static void percpu_modcopy(struct module
*mod
,
516 const void *from
, unsigned long size
)
520 for_each_possible_cpu(cpu
)
521 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
525 * is_module_percpu_address - test whether address is from module static percpu
526 * @addr: address to test
528 * Test whether @addr belongs to module static percpu area.
531 * %true if @addr is from module static percpu area
533 bool is_module_percpu_address(unsigned long addr
)
540 list_for_each_entry_rcu(mod
, &modules
, list
) {
541 if (mod
->state
== MODULE_STATE_UNFORMED
)
543 if (!mod
->percpu_size
)
545 for_each_possible_cpu(cpu
) {
546 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
548 if ((void *)addr
>= start
&&
549 (void *)addr
< start
+ mod
->percpu_size
) {
560 #else /* ... !CONFIG_SMP */
562 static inline void __percpu
*mod_percpu(struct module
*mod
)
566 static inline int percpu_modalloc(struct module
*mod
,
567 unsigned long size
, unsigned long align
)
571 static inline void percpu_modfree(struct module
*mod
)
574 static unsigned int find_pcpusec(struct load_info
*info
)
578 static inline void percpu_modcopy(struct module
*mod
,
579 const void *from
, unsigned long size
)
581 /* pcpusec should be 0, and size of that section should be 0. */
584 bool is_module_percpu_address(unsigned long addr
)
589 #endif /* CONFIG_SMP */
591 #define MODINFO_ATTR(field) \
592 static void setup_modinfo_##field(struct module *mod, const char *s) \
594 mod->field = kstrdup(s, GFP_KERNEL); \
596 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
597 struct module_kobject *mk, char *buffer) \
599 return sprintf(buffer, "%s\n", mk->mod->field); \
601 static int modinfo_##field##_exists(struct module *mod) \
603 return mod->field != NULL; \
605 static void free_modinfo_##field(struct module *mod) \
610 static struct module_attribute modinfo_##field = { \
611 .attr = { .name = __stringify(field), .mode = 0444 }, \
612 .show = show_modinfo_##field, \
613 .setup = setup_modinfo_##field, \
614 .test = modinfo_##field##_exists, \
615 .free = free_modinfo_##field, \
618 MODINFO_ATTR(version
);
619 MODINFO_ATTR(srcversion
);
621 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
623 #ifdef CONFIG_MODULE_UNLOAD
625 EXPORT_TRACEPOINT_SYMBOL(module_get
);
627 /* Init the unload section of the module. */
628 static int module_unload_init(struct module
*mod
)
630 mod
->refptr
= alloc_percpu(struct module_ref
);
634 INIT_LIST_HEAD(&mod
->source_list
);
635 INIT_LIST_HEAD(&mod
->target_list
);
637 /* Hold reference count during initialization. */
638 __this_cpu_write(mod
->refptr
->incs
, 1);
639 /* Backwards compatibility macros put refcount during init. */
640 mod
->waiter
= current
;
645 /* Does a already use b? */
646 static int already_uses(struct module
*a
, struct module
*b
)
648 struct module_use
*use
;
650 list_for_each_entry(use
, &b
->source_list
, source_list
) {
651 if (use
->source
== a
) {
652 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
656 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
662 * - we add 'a' as a "source", 'b' as a "target" of module use
663 * - the module_use is added to the list of 'b' sources (so
664 * 'b' can walk the list to see who sourced them), and of 'a'
665 * targets (so 'a' can see what modules it targets).
667 static int add_module_usage(struct module
*a
, struct module
*b
)
669 struct module_use
*use
;
671 pr_debug("Allocating new usage for %s.\n", a
->name
);
672 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
674 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
680 list_add(&use
->source_list
, &b
->source_list
);
681 list_add(&use
->target_list
, &a
->target_list
);
685 /* Module a uses b: caller needs module_mutex() */
686 int ref_module(struct module
*a
, struct module
*b
)
690 if (b
== NULL
|| already_uses(a
, b
))
693 /* If module isn't available, we fail. */
694 err
= strong_try_module_get(b
);
698 err
= add_module_usage(a
, b
);
705 EXPORT_SYMBOL_GPL(ref_module
);
707 /* Clear the unload stuff of the module. */
708 static void module_unload_free(struct module
*mod
)
710 struct module_use
*use
, *tmp
;
712 mutex_lock(&module_mutex
);
713 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
714 struct module
*i
= use
->target
;
715 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
717 list_del(&use
->source_list
);
718 list_del(&use
->target_list
);
721 mutex_unlock(&module_mutex
);
723 free_percpu(mod
->refptr
);
726 #ifdef CONFIG_MODULE_FORCE_UNLOAD
727 static inline int try_force_unload(unsigned int flags
)
729 int ret
= (flags
& O_TRUNC
);
731 add_taint(TAINT_FORCED_RMMOD
, LOCKDEP_NOW_UNRELIABLE
);
735 static inline int try_force_unload(unsigned int flags
)
739 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
748 /* Whole machine is stopped with interrupts off when this runs. */
749 static int __try_stop_module(void *_sref
)
751 struct stopref
*sref
= _sref
;
753 /* If it's not unused, quit unless we're forcing. */
754 if (module_refcount(sref
->mod
) != 0) {
755 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
759 /* Mark it as dying. */
760 sref
->mod
->state
= MODULE_STATE_GOING
;
764 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
766 if (flags
& O_NONBLOCK
) {
767 struct stopref sref
= { mod
, flags
, forced
};
769 return stop_machine(__try_stop_module
, &sref
, NULL
);
771 /* We don't need to stop the machine for this. */
772 mod
->state
= MODULE_STATE_GOING
;
778 unsigned long module_refcount(struct module
*mod
)
780 unsigned long incs
= 0, decs
= 0;
783 for_each_possible_cpu(cpu
)
784 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
786 * ensure the incs are added up after the decs.
787 * module_put ensures incs are visible before decs with smp_wmb.
789 * This 2-count scheme avoids the situation where the refcount
790 * for CPU0 is read, then CPU0 increments the module refcount,
791 * then CPU1 drops that refcount, then the refcount for CPU1 is
792 * read. We would record a decrement but not its corresponding
793 * increment so we would see a low count (disaster).
795 * Rare situation? But module_refcount can be preempted, and we
796 * might be tallying up 4096+ CPUs. So it is not impossible.
799 for_each_possible_cpu(cpu
)
800 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
803 EXPORT_SYMBOL(module_refcount
);
805 /* This exists whether we can unload or not */
806 static void free_module(struct module
*mod
);
808 static void wait_for_zero_refcount(struct module
*mod
)
810 /* Since we might sleep for some time, release the mutex first */
811 mutex_unlock(&module_mutex
);
813 pr_debug("Looking at refcount...\n");
814 set_current_state(TASK_UNINTERRUPTIBLE
);
815 if (module_refcount(mod
) == 0)
819 current
->state
= TASK_RUNNING
;
820 mutex_lock(&module_mutex
);
823 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
827 char name
[MODULE_NAME_LEN
];
830 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
833 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
835 name
[MODULE_NAME_LEN
-1] = '\0';
837 if (mutex_lock_interruptible(&module_mutex
) != 0)
840 mod
= find_module(name
);
846 if (!list_empty(&mod
->source_list
)) {
847 /* Other modules depend on us: get rid of them first. */
852 /* Doing init or already dying? */
853 if (mod
->state
!= MODULE_STATE_LIVE
) {
854 /* FIXME: if (force), slam module count and wake up
856 pr_debug("%s already dying\n", mod
->name
);
861 /* If it has an init func, it must have an exit func to unload */
862 if (mod
->init
&& !mod
->exit
) {
863 forced
= try_force_unload(flags
);
865 /* This module can't be removed */
871 /* Set this up before setting mod->state */
872 mod
->waiter
= current
;
874 /* Stop the machine so refcounts can't move and disable module. */
875 ret
= try_stop_module(mod
, flags
, &forced
);
879 /* Never wait if forced. */
880 if (!forced
&& module_refcount(mod
) != 0)
881 wait_for_zero_refcount(mod
);
883 mutex_unlock(&module_mutex
);
884 /* Final destruction now no one is using it. */
885 if (mod
->exit
!= NULL
)
887 blocking_notifier_call_chain(&module_notify_list
,
888 MODULE_STATE_GOING
, mod
);
889 async_synchronize_full();
891 /* Store the name of the last unloaded module for diagnostic purposes */
892 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
897 mutex_unlock(&module_mutex
);
901 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
903 struct module_use
*use
;
904 int printed_something
= 0;
906 seq_printf(m
, " %lu ", module_refcount(mod
));
908 /* Always include a trailing , so userspace can differentiate
909 between this and the old multi-field proc format. */
910 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
911 printed_something
= 1;
912 seq_printf(m
, "%s,", use
->source
->name
);
915 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
916 printed_something
= 1;
917 seq_printf(m
, "[permanent],");
920 if (!printed_something
)
924 void __symbol_put(const char *symbol
)
926 struct module
*owner
;
929 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
934 EXPORT_SYMBOL(__symbol_put
);
936 /* Note this assumes addr is a function, which it currently always is. */
937 void symbol_put_addr(void *addr
)
939 struct module
*modaddr
;
940 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
942 if (core_kernel_text(a
))
946 * Even though we hold a reference on the module; we still need to
947 * disable preemption in order to safely traverse the data structure.
950 modaddr
= __module_text_address(a
);
955 EXPORT_SYMBOL_GPL(symbol_put_addr
);
957 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
958 struct module_kobject
*mk
, char *buffer
)
960 return sprintf(buffer
, "%lu\n", module_refcount(mk
->mod
));
963 static struct module_attribute modinfo_refcnt
=
964 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
966 void __module_get(struct module
*module
)
970 __this_cpu_inc(module
->refptr
->incs
);
971 trace_module_get(module
, _RET_IP_
);
975 EXPORT_SYMBOL(__module_get
);
977 bool try_module_get(struct module
*module
)
984 if (likely(module_is_live(module
))) {
985 __this_cpu_inc(module
->refptr
->incs
);
986 trace_module_get(module
, _RET_IP_
);
994 EXPORT_SYMBOL(try_module_get
);
996 void module_put(struct module
*module
)
1000 smp_wmb(); /* see comment in module_refcount */
1001 __this_cpu_inc(module
->refptr
->decs
);
1003 trace_module_put(module
, _RET_IP_
);
1004 /* Maybe they're waiting for us to drop reference? */
1005 if (unlikely(!module_is_live(module
)))
1006 wake_up_process(module
->waiter
);
1010 EXPORT_SYMBOL(module_put
);
1012 #else /* !CONFIG_MODULE_UNLOAD */
1013 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1015 /* We don't know the usage count, or what modules are using. */
1016 seq_printf(m
, " - -");
1019 static inline void module_unload_free(struct module
*mod
)
1023 int ref_module(struct module
*a
, struct module
*b
)
1025 return strong_try_module_get(b
);
1027 EXPORT_SYMBOL_GPL(ref_module
);
1029 static inline int module_unload_init(struct module
*mod
)
1033 #endif /* CONFIG_MODULE_UNLOAD */
1035 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1039 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1041 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1043 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1045 if (mod
->taints
& (1 << TAINT_CRAP
))
1048 * TAINT_FORCED_RMMOD: could be added.
1049 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1055 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1056 struct module_kobject
*mk
, char *buffer
)
1058 const char *state
= "unknown";
1060 switch (mk
->mod
->state
) {
1061 case MODULE_STATE_LIVE
:
1064 case MODULE_STATE_COMING
:
1067 case MODULE_STATE_GOING
:
1073 return sprintf(buffer
, "%s\n", state
);
1076 static struct module_attribute modinfo_initstate
=
1077 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1079 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1080 struct module_kobject
*mk
,
1081 const char *buffer
, size_t count
)
1083 enum kobject_action action
;
1085 if (kobject_action_type(buffer
, count
, &action
) == 0)
1086 kobject_uevent(&mk
->kobj
, action
);
1090 struct module_attribute module_uevent
=
1091 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1093 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1094 struct module_kobject
*mk
, char *buffer
)
1096 return sprintf(buffer
, "%u\n", mk
->mod
->core_size
);
1099 static struct module_attribute modinfo_coresize
=
1100 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1102 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1103 struct module_kobject
*mk
, char *buffer
)
1105 return sprintf(buffer
, "%u\n", mk
->mod
->init_size
);
1108 static struct module_attribute modinfo_initsize
=
1109 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1111 static ssize_t
show_taint(struct module_attribute
*mattr
,
1112 struct module_kobject
*mk
, char *buffer
)
1116 l
= module_flags_taint(mk
->mod
, buffer
);
1121 static struct module_attribute modinfo_taint
=
1122 __ATTR(taint
, 0444, show_taint
, NULL
);
1124 static struct module_attribute
*modinfo_attrs
[] = {
1127 &modinfo_srcversion
,
1132 #ifdef CONFIG_MODULE_UNLOAD
1138 static const char vermagic
[] = VERMAGIC_STRING
;
1140 static int try_to_force_load(struct module
*mod
, const char *reason
)
1142 #ifdef CONFIG_MODULE_FORCE_LOAD
1143 if (!test_taint(TAINT_FORCED_MODULE
))
1144 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
1146 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
1153 #ifdef CONFIG_MODVERSIONS
1154 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1155 static unsigned long maybe_relocated(unsigned long crc
,
1156 const struct module
*crc_owner
)
1158 #ifdef ARCH_RELOCATES_KCRCTAB
1159 if (crc_owner
== NULL
)
1160 return crc
- (unsigned long)reloc_start
;
1165 static int check_version(Elf_Shdr
*sechdrs
,
1166 unsigned int versindex
,
1167 const char *symname
,
1169 const unsigned long *crc
,
1170 const struct module
*crc_owner
)
1172 unsigned int i
, num_versions
;
1173 struct modversion_info
*versions
;
1175 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1179 /* No versions at all? modprobe --force does this. */
1181 return try_to_force_load(mod
, symname
) == 0;
1183 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1184 num_versions
= sechdrs
[versindex
].sh_size
1185 / sizeof(struct modversion_info
);
1187 for (i
= 0; i
< num_versions
; i
++) {
1188 if (strcmp(versions
[i
].name
, symname
) != 0)
1191 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1193 pr_debug("Found checksum %lX vs module %lX\n",
1194 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1198 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1199 mod
->name
, symname
);
1203 printk("%s: disagrees about version of symbol %s\n",
1204 mod
->name
, symname
);
1208 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1209 unsigned int versindex
,
1212 const unsigned long *crc
;
1214 /* Since this should be found in kernel (which can't be removed),
1215 * no locking is necessary. */
1216 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout
), NULL
,
1219 return check_version(sechdrs
, versindex
,
1220 VMLINUX_SYMBOL_STR(module_layout
), mod
, crc
,
1224 /* First part is kernel version, which we ignore if module has crcs. */
1225 static inline int same_magic(const char *amagic
, const char *bmagic
,
1229 amagic
+= strcspn(amagic
, " ");
1230 bmagic
+= strcspn(bmagic
, " ");
1232 return strcmp(amagic
, bmagic
) == 0;
1235 static inline int check_version(Elf_Shdr
*sechdrs
,
1236 unsigned int versindex
,
1237 const char *symname
,
1239 const unsigned long *crc
,
1240 const struct module
*crc_owner
)
1245 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1246 unsigned int versindex
,
1252 static inline int same_magic(const char *amagic
, const char *bmagic
,
1255 return strcmp(amagic
, bmagic
) == 0;
1257 #endif /* CONFIG_MODVERSIONS */
1259 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1260 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1261 const struct load_info
*info
,
1265 struct module
*owner
;
1266 const struct kernel_symbol
*sym
;
1267 const unsigned long *crc
;
1270 mutex_lock(&module_mutex
);
1271 sym
= find_symbol(name
, &owner
, &crc
,
1272 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1276 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1278 sym
= ERR_PTR(-EINVAL
);
1282 err
= ref_module(mod
, owner
);
1289 /* We must make copy under the lock if we failed to get ref. */
1290 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1292 mutex_unlock(&module_mutex
);
1296 static const struct kernel_symbol
*
1297 resolve_symbol_wait(struct module
*mod
,
1298 const struct load_info
*info
,
1301 const struct kernel_symbol
*ksym
;
1302 char owner
[MODULE_NAME_LEN
];
1304 if (wait_event_interruptible_timeout(module_wq
,
1305 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1306 || PTR_ERR(ksym
) != -EBUSY
,
1308 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1315 * /sys/module/foo/sections stuff
1316 * J. Corbet <corbet@lwn.net>
1320 #ifdef CONFIG_KALLSYMS
1321 static inline bool sect_empty(const Elf_Shdr
*sect
)
1323 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1326 struct module_sect_attr
1328 struct module_attribute mattr
;
1330 unsigned long address
;
1333 struct module_sect_attrs
1335 struct attribute_group grp
;
1336 unsigned int nsections
;
1337 struct module_sect_attr attrs
[0];
1340 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1341 struct module_kobject
*mk
, char *buf
)
1343 struct module_sect_attr
*sattr
=
1344 container_of(mattr
, struct module_sect_attr
, mattr
);
1345 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1348 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1350 unsigned int section
;
1352 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1353 kfree(sect_attrs
->attrs
[section
].name
);
1357 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1359 unsigned int nloaded
= 0, i
, size
[2];
1360 struct module_sect_attrs
*sect_attrs
;
1361 struct module_sect_attr
*sattr
;
1362 struct attribute
**gattr
;
1364 /* Count loaded sections and allocate structures */
1365 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1366 if (!sect_empty(&info
->sechdrs
[i
]))
1368 size
[0] = ALIGN(sizeof(*sect_attrs
)
1369 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1370 sizeof(sect_attrs
->grp
.attrs
[0]));
1371 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1372 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1373 if (sect_attrs
== NULL
)
1376 /* Setup section attributes. */
1377 sect_attrs
->grp
.name
= "sections";
1378 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1380 sect_attrs
->nsections
= 0;
1381 sattr
= §_attrs
->attrs
[0];
1382 gattr
= §_attrs
->grp
.attrs
[0];
1383 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1384 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1385 if (sect_empty(sec
))
1387 sattr
->address
= sec
->sh_addr
;
1388 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1390 if (sattr
->name
== NULL
)
1392 sect_attrs
->nsections
++;
1393 sysfs_attr_init(&sattr
->mattr
.attr
);
1394 sattr
->mattr
.show
= module_sect_show
;
1395 sattr
->mattr
.store
= NULL
;
1396 sattr
->mattr
.attr
.name
= sattr
->name
;
1397 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1398 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1402 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1405 mod
->sect_attrs
= sect_attrs
;
1408 free_sect_attrs(sect_attrs
);
1411 static void remove_sect_attrs(struct module
*mod
)
1413 if (mod
->sect_attrs
) {
1414 sysfs_remove_group(&mod
->mkobj
.kobj
,
1415 &mod
->sect_attrs
->grp
);
1416 /* We are positive that no one is using any sect attrs
1417 * at this point. Deallocate immediately. */
1418 free_sect_attrs(mod
->sect_attrs
);
1419 mod
->sect_attrs
= NULL
;
1424 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1427 struct module_notes_attrs
{
1428 struct kobject
*dir
;
1430 struct bin_attribute attrs
[0];
1433 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1434 struct bin_attribute
*bin_attr
,
1435 char *buf
, loff_t pos
, size_t count
)
1438 * The caller checked the pos and count against our size.
1440 memcpy(buf
, bin_attr
->private + pos
, count
);
1444 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1447 if (notes_attrs
->dir
) {
1449 sysfs_remove_bin_file(notes_attrs
->dir
,
1450 ¬es_attrs
->attrs
[i
]);
1451 kobject_put(notes_attrs
->dir
);
1456 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1458 unsigned int notes
, loaded
, i
;
1459 struct module_notes_attrs
*notes_attrs
;
1460 struct bin_attribute
*nattr
;
1462 /* failed to create section attributes, so can't create notes */
1463 if (!mod
->sect_attrs
)
1466 /* Count notes sections and allocate structures. */
1468 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1469 if (!sect_empty(&info
->sechdrs
[i
]) &&
1470 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1476 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1477 + notes
* sizeof(notes_attrs
->attrs
[0]),
1479 if (notes_attrs
== NULL
)
1482 notes_attrs
->notes
= notes
;
1483 nattr
= ¬es_attrs
->attrs
[0];
1484 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1485 if (sect_empty(&info
->sechdrs
[i
]))
1487 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1488 sysfs_bin_attr_init(nattr
);
1489 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1490 nattr
->attr
.mode
= S_IRUGO
;
1491 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1492 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1493 nattr
->read
= module_notes_read
;
1499 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1500 if (!notes_attrs
->dir
)
1503 for (i
= 0; i
< notes
; ++i
)
1504 if (sysfs_create_bin_file(notes_attrs
->dir
,
1505 ¬es_attrs
->attrs
[i
]))
1508 mod
->notes_attrs
= notes_attrs
;
1512 free_notes_attrs(notes_attrs
, i
);
1515 static void remove_notes_attrs(struct module
*mod
)
1517 if (mod
->notes_attrs
)
1518 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1523 static inline void add_sect_attrs(struct module
*mod
,
1524 const struct load_info
*info
)
1528 static inline void remove_sect_attrs(struct module
*mod
)
1532 static inline void add_notes_attrs(struct module
*mod
,
1533 const struct load_info
*info
)
1537 static inline void remove_notes_attrs(struct module
*mod
)
1540 #endif /* CONFIG_KALLSYMS */
1542 static void add_usage_links(struct module
*mod
)
1544 #ifdef CONFIG_MODULE_UNLOAD
1545 struct module_use
*use
;
1548 mutex_lock(&module_mutex
);
1549 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1550 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1551 &mod
->mkobj
.kobj
, mod
->name
);
1553 mutex_unlock(&module_mutex
);
1557 static void del_usage_links(struct module
*mod
)
1559 #ifdef CONFIG_MODULE_UNLOAD
1560 struct module_use
*use
;
1562 mutex_lock(&module_mutex
);
1563 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1564 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1565 mutex_unlock(&module_mutex
);
1569 static int module_add_modinfo_attrs(struct module
*mod
)
1571 struct module_attribute
*attr
;
1572 struct module_attribute
*temp_attr
;
1576 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1577 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1579 if (!mod
->modinfo_attrs
)
1582 temp_attr
= mod
->modinfo_attrs
;
1583 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1585 (attr
->test
&& attr
->test(mod
))) {
1586 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1587 sysfs_attr_init(&temp_attr
->attr
);
1588 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1595 static void module_remove_modinfo_attrs(struct module
*mod
)
1597 struct module_attribute
*attr
;
1600 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1601 /* pick a field to test for end of list */
1602 if (!attr
->attr
.name
)
1604 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1608 kfree(mod
->modinfo_attrs
);
1611 static int mod_sysfs_init(struct module
*mod
)
1614 struct kobject
*kobj
;
1616 if (!module_sysfs_initialized
) {
1617 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1623 kobj
= kset_find_obj(module_kset
, mod
->name
);
1625 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1631 mod
->mkobj
.mod
= mod
;
1633 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1634 mod
->mkobj
.kobj
.kset
= module_kset
;
1635 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1638 kobject_put(&mod
->mkobj
.kobj
);
1640 /* delay uevent until full sysfs population */
1645 static int mod_sysfs_setup(struct module
*mod
,
1646 const struct load_info
*info
,
1647 struct kernel_param
*kparam
,
1648 unsigned int num_params
)
1652 err
= mod_sysfs_init(mod
);
1656 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1657 if (!mod
->holders_dir
) {
1662 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1664 goto out_unreg_holders
;
1666 err
= module_add_modinfo_attrs(mod
);
1668 goto out_unreg_param
;
1670 add_usage_links(mod
);
1671 add_sect_attrs(mod
, info
);
1672 add_notes_attrs(mod
, info
);
1674 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1678 module_param_sysfs_remove(mod
);
1680 kobject_put(mod
->holders_dir
);
1682 kobject_put(&mod
->mkobj
.kobj
);
1687 static void mod_sysfs_fini(struct module
*mod
)
1689 remove_notes_attrs(mod
);
1690 remove_sect_attrs(mod
);
1691 kobject_put(&mod
->mkobj
.kobj
);
1694 #else /* !CONFIG_SYSFS */
1696 static int mod_sysfs_setup(struct module
*mod
,
1697 const struct load_info
*info
,
1698 struct kernel_param
*kparam
,
1699 unsigned int num_params
)
1704 static void mod_sysfs_fini(struct module
*mod
)
1708 static void module_remove_modinfo_attrs(struct module
*mod
)
1712 static void del_usage_links(struct module
*mod
)
1716 #endif /* CONFIG_SYSFS */
1718 static void mod_sysfs_teardown(struct module
*mod
)
1720 del_usage_links(mod
);
1721 module_remove_modinfo_attrs(mod
);
1722 module_param_sysfs_remove(mod
);
1723 kobject_put(mod
->mkobj
.drivers_dir
);
1724 kobject_put(mod
->holders_dir
);
1725 mod_sysfs_fini(mod
);
1729 * unlink the module with the whole machine is stopped with interrupts off
1730 * - this defends against kallsyms not taking locks
1732 static int __unlink_module(void *_mod
)
1734 struct module
*mod
= _mod
;
1735 list_del(&mod
->list
);
1736 module_bug_cleanup(mod
);
1740 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1742 * LKM RO/NX protection: protect module's text/ro-data
1743 * from modification and any data from execution.
1745 void set_page_attributes(void *start
, void *end
, int (*set
)(unsigned long start
, int num_pages
))
1747 unsigned long begin_pfn
= PFN_DOWN((unsigned long)start
);
1748 unsigned long end_pfn
= PFN_DOWN((unsigned long)end
);
1750 if (end_pfn
> begin_pfn
)
1751 set(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1754 static void set_section_ro_nx(void *base
,
1755 unsigned long text_size
,
1756 unsigned long ro_size
,
1757 unsigned long total_size
)
1759 /* begin and end PFNs of the current subsection */
1760 unsigned long begin_pfn
;
1761 unsigned long end_pfn
;
1764 * Set RO for module text and RO-data:
1765 * - Always protect first page.
1766 * - Do not protect last partial page.
1769 set_page_attributes(base
, base
+ ro_size
, set_memory_ro
);
1772 * Set NX permissions for module data:
1773 * - Do not protect first partial page.
1774 * - Always protect last page.
1776 if (total_size
> text_size
) {
1777 begin_pfn
= PFN_UP((unsigned long)base
+ text_size
);
1778 end_pfn
= PFN_UP((unsigned long)base
+ total_size
);
1779 if (end_pfn
> begin_pfn
)
1780 set_memory_nx(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1784 static void unset_module_core_ro_nx(struct module
*mod
)
1786 set_page_attributes(mod
->module_core
+ mod
->core_text_size
,
1787 mod
->module_core
+ mod
->core_size
,
1789 set_page_attributes(mod
->module_core
,
1790 mod
->module_core
+ mod
->core_ro_size
,
1794 static void unset_module_init_ro_nx(struct module
*mod
)
1796 set_page_attributes(mod
->module_init
+ mod
->init_text_size
,
1797 mod
->module_init
+ mod
->init_size
,
1799 set_page_attributes(mod
->module_init
,
1800 mod
->module_init
+ mod
->init_ro_size
,
1804 /* Iterate through all modules and set each module's text as RW */
1805 void set_all_modules_text_rw(void)
1809 mutex_lock(&module_mutex
);
1810 list_for_each_entry_rcu(mod
, &modules
, list
) {
1811 if (mod
->state
== MODULE_STATE_UNFORMED
)
1813 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1814 set_page_attributes(mod
->module_core
,
1815 mod
->module_core
+ mod
->core_text_size
,
1818 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1819 set_page_attributes(mod
->module_init
,
1820 mod
->module_init
+ mod
->init_text_size
,
1824 mutex_unlock(&module_mutex
);
1827 /* Iterate through all modules and set each module's text as RO */
1828 void set_all_modules_text_ro(void)
1832 mutex_lock(&module_mutex
);
1833 list_for_each_entry_rcu(mod
, &modules
, list
) {
1834 if (mod
->state
== MODULE_STATE_UNFORMED
)
1836 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1837 set_page_attributes(mod
->module_core
,
1838 mod
->module_core
+ mod
->core_text_size
,
1841 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1842 set_page_attributes(mod
->module_init
,
1843 mod
->module_init
+ mod
->init_text_size
,
1847 mutex_unlock(&module_mutex
);
1850 static inline void set_section_ro_nx(void *base
, unsigned long text_size
, unsigned long ro_size
, unsigned long total_size
) { }
1851 static void unset_module_core_ro_nx(struct module
*mod
) { }
1852 static void unset_module_init_ro_nx(struct module
*mod
) { }
1855 void __weak
module_free(struct module
*mod
, void *module_region
)
1857 vfree(module_region
);
1860 void __weak
module_arch_cleanup(struct module
*mod
)
1864 /* Free a module, remove from lists, etc. */
1865 static void free_module(struct module
*mod
)
1867 trace_module_free(mod
);
1869 mod_sysfs_teardown(mod
);
1871 /* We leave it in list to prevent duplicate loads, but make sure
1872 * that noone uses it while it's being deconstructed. */
1873 mutex_lock(&module_mutex
);
1874 mod
->state
= MODULE_STATE_UNFORMED
;
1875 mutex_unlock(&module_mutex
);
1877 /* Remove dynamic debug info */
1878 ddebug_remove_module(mod
->name
);
1880 /* Arch-specific cleanup. */
1881 module_arch_cleanup(mod
);
1883 /* Module unload stuff */
1884 module_unload_free(mod
);
1886 /* Free any allocated parameters. */
1887 destroy_params(mod
->kp
, mod
->num_kp
);
1889 /* Now we can delete it from the lists */
1890 mutex_lock(&module_mutex
);
1891 stop_machine(__unlink_module
, mod
, NULL
);
1892 mutex_unlock(&module_mutex
);
1894 /* This may be NULL, but that's OK */
1895 unset_module_init_ro_nx(mod
);
1896 module_free(mod
, mod
->module_init
);
1898 percpu_modfree(mod
);
1900 /* Free lock-classes: */
1901 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1903 /* Finally, free the core (containing the module structure) */
1904 unset_module_core_ro_nx(mod
);
1905 module_free(mod
, mod
->module_core
);
1908 update_protections(current
->mm
);
1912 void *__symbol_get(const char *symbol
)
1914 struct module
*owner
;
1915 const struct kernel_symbol
*sym
;
1918 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1919 if (sym
&& strong_try_module_get(owner
))
1923 return sym
? (void *)sym
->value
: NULL
;
1925 EXPORT_SYMBOL_GPL(__symbol_get
);
1928 * Ensure that an exported symbol [global namespace] does not already exist
1929 * in the kernel or in some other module's exported symbol table.
1931 * You must hold the module_mutex.
1933 static int verify_export_symbols(struct module
*mod
)
1936 struct module
*owner
;
1937 const struct kernel_symbol
*s
;
1939 const struct kernel_symbol
*sym
;
1942 { mod
->syms
, mod
->num_syms
},
1943 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1944 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1945 #ifdef CONFIG_UNUSED_SYMBOLS
1946 { mod
->unused_syms
, mod
->num_unused_syms
},
1947 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1951 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1952 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1953 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1955 "%s: exports duplicate symbol %s"
1957 mod
->name
, s
->name
, module_name(owner
));
1965 /* Change all symbols so that st_value encodes the pointer directly. */
1966 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
1968 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
1969 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
1970 unsigned long secbase
;
1973 const struct kernel_symbol
*ksym
;
1975 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
1976 const char *name
= info
->strtab
+ sym
[i
].st_name
;
1978 switch (sym
[i
].st_shndx
) {
1980 /* We compiled with -fno-common. These are not
1981 supposed to happen. */
1982 pr_debug("Common symbol: %s\n", name
);
1983 printk("%s: please compile with -fno-common\n",
1989 /* Don't need to do anything */
1990 pr_debug("Absolute symbol: 0x%08lx\n",
1991 (long)sym
[i
].st_value
);
1995 ksym
= resolve_symbol_wait(mod
, info
, name
);
1996 /* Ok if resolved. */
1997 if (ksym
&& !IS_ERR(ksym
)) {
1998 sym
[i
].st_value
= ksym
->value
;
2003 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
2006 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
2007 mod
->name
, name
, PTR_ERR(ksym
));
2008 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
2012 /* Divert to percpu allocation if a percpu var. */
2013 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
2014 secbase
= (unsigned long)mod_percpu(mod
);
2016 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
2017 sym
[i
].st_value
+= secbase
;
2025 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
2030 /* Now do relocations. */
2031 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2032 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2034 /* Not a valid relocation section? */
2035 if (infosec
>= info
->hdr
->e_shnum
)
2038 /* Don't bother with non-allocated sections */
2039 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2042 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2043 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2044 info
->index
.sym
, i
, mod
);
2045 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2046 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2047 info
->index
.sym
, i
, mod
);
2054 /* Additional bytes needed by arch in front of individual sections */
2055 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2056 unsigned int section
)
2058 /* default implementation just returns zero */
2062 /* Update size with this section: return offset. */
2063 static long get_offset(struct module
*mod
, unsigned int *size
,
2064 Elf_Shdr
*sechdr
, unsigned int section
)
2068 *size
+= arch_mod_section_prepend(mod
, section
);
2069 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2070 *size
= ret
+ sechdr
->sh_size
;
2074 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2075 might -- code, read-only data, read-write data, small data. Tally
2076 sizes, and place the offsets into sh_entsize fields: high bit means it
2078 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2080 static unsigned long const masks
[][2] = {
2081 /* NOTE: all executable code must be the first section
2082 * in this array; otherwise modify the text_size
2083 * finder in the two loops below */
2084 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2085 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2086 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2087 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2091 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2092 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2094 pr_debug("Core section allocation order:\n");
2095 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2096 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2097 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2098 const char *sname
= info
->secstrings
+ s
->sh_name
;
2100 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2101 || (s
->sh_flags
& masks
[m
][1])
2102 || s
->sh_entsize
!= ~0UL
2103 || strstarts(sname
, ".init"))
2105 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
2106 pr_debug("\t%s\n", sname
);
2109 case 0: /* executable */
2110 mod
->core_size
= debug_align(mod
->core_size
);
2111 mod
->core_text_size
= mod
->core_size
;
2113 case 1: /* RO: text and ro-data */
2114 mod
->core_size
= debug_align(mod
->core_size
);
2115 mod
->core_ro_size
= mod
->core_size
;
2117 case 3: /* whole core */
2118 mod
->core_size
= debug_align(mod
->core_size
);
2123 pr_debug("Init section allocation order:\n");
2124 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2125 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2126 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2127 const char *sname
= info
->secstrings
+ s
->sh_name
;
2129 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2130 || (s
->sh_flags
& masks
[m
][1])
2131 || s
->sh_entsize
!= ~0UL
2132 || !strstarts(sname
, ".init"))
2134 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
2135 | INIT_OFFSET_MASK
);
2136 pr_debug("\t%s\n", sname
);
2139 case 0: /* executable */
2140 mod
->init_size
= debug_align(mod
->init_size
);
2141 mod
->init_text_size
= mod
->init_size
;
2143 case 1: /* RO: text and ro-data */
2144 mod
->init_size
= debug_align(mod
->init_size
);
2145 mod
->init_ro_size
= mod
->init_size
;
2147 case 3: /* whole init */
2148 mod
->init_size
= debug_align(mod
->init_size
);
2154 static void set_license(struct module
*mod
, const char *license
)
2157 license
= "unspecified";
2159 if (!license_is_gpl_compatible(license
)) {
2160 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2161 printk(KERN_WARNING
"%s: module license '%s' taints "
2162 "kernel.\n", mod
->name
, license
);
2163 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2164 LOCKDEP_NOW_UNRELIABLE
);
2168 /* Parse tag=value strings from .modinfo section */
2169 static char *next_string(char *string
, unsigned long *secsize
)
2171 /* Skip non-zero chars */
2174 if ((*secsize
)-- <= 1)
2178 /* Skip any zero padding. */
2179 while (!string
[0]) {
2181 if ((*secsize
)-- <= 1)
2187 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2190 unsigned int taglen
= strlen(tag
);
2191 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2192 unsigned long size
= infosec
->sh_size
;
2194 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2195 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2196 return p
+ taglen
+ 1;
2201 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2203 struct module_attribute
*attr
;
2206 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2208 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2212 static void free_modinfo(struct module
*mod
)
2214 struct module_attribute
*attr
;
2217 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2223 #ifdef CONFIG_KALLSYMS
2225 /* lookup symbol in given range of kernel_symbols */
2226 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2227 const struct kernel_symbol
*start
,
2228 const struct kernel_symbol
*stop
)
2230 return bsearch(name
, start
, stop
- start
,
2231 sizeof(struct kernel_symbol
), cmp_name
);
2234 static int is_exported(const char *name
, unsigned long value
,
2235 const struct module
*mod
)
2237 const struct kernel_symbol
*ks
;
2239 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2241 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2242 return ks
!= NULL
&& ks
->value
== value
;
2246 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2248 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2250 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2251 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2256 if (sym
->st_shndx
== SHN_UNDEF
)
2258 if (sym
->st_shndx
== SHN_ABS
)
2260 if (sym
->st_shndx
>= SHN_LORESERVE
)
2262 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2264 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2265 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2266 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2268 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2273 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2274 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2279 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2286 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2289 const Elf_Shdr
*sec
;
2291 if (src
->st_shndx
== SHN_UNDEF
2292 || src
->st_shndx
>= shnum
2296 sec
= sechdrs
+ src
->st_shndx
;
2297 if (!(sec
->sh_flags
& SHF_ALLOC
)
2298 #ifndef CONFIG_KALLSYMS_ALL
2299 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2301 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2308 * We only allocate and copy the strings needed by the parts of symtab
2309 * we keep. This is simple, but has the effect of making multiple
2310 * copies of duplicates. We could be more sophisticated, see
2311 * linux-kernel thread starting with
2312 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2314 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2316 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2317 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2319 unsigned int i
, nsrc
, ndst
, strtab_size
= 0;
2321 /* Put symbol section at end of init part of module. */
2322 symsect
->sh_flags
|= SHF_ALLOC
;
2323 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
2324 info
->index
.sym
) | INIT_OFFSET_MASK
;
2325 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2327 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2328 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2330 /* Compute total space required for the core symbols' strtab. */
2331 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2333 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2334 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2339 /* Append room for core symbols at end of core part. */
2340 info
->symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
2341 info
->stroffs
= mod
->core_size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2342 mod
->core_size
+= strtab_size
;
2344 /* Put string table section at end of init part of module. */
2345 strsect
->sh_flags
|= SHF_ALLOC
;
2346 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
2347 info
->index
.str
) | INIT_OFFSET_MASK
;
2348 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2351 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2353 unsigned int i
, ndst
;
2357 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2359 mod
->symtab
= (void *)symsec
->sh_addr
;
2360 mod
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2361 /* Make sure we get permanent strtab: don't use info->strtab. */
2362 mod
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2364 /* Set types up while we still have access to sections. */
2365 for (i
= 0; i
< mod
->num_symtab
; i
++)
2366 mod
->symtab
[i
].st_info
= elf_type(&mod
->symtab
[i
], info
);
2368 mod
->core_symtab
= dst
= mod
->module_core
+ info
->symoffs
;
2369 mod
->core_strtab
= s
= mod
->module_core
+ info
->stroffs
;
2371 for (ndst
= i
= 0; i
< mod
->num_symtab
; i
++) {
2373 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2375 dst
[ndst
++].st_name
= s
- mod
->core_strtab
;
2376 s
+= strlcpy(s
, &mod
->strtab
[src
[i
].st_name
],
2380 mod
->core_num_syms
= ndst
;
2383 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2387 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2390 #endif /* CONFIG_KALLSYMS */
2392 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2396 #ifdef CONFIG_DYNAMIC_DEBUG
2397 if (ddebug_add_module(debug
, num
, debug
->modname
))
2398 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2403 static void dynamic_debug_remove(struct _ddebug
*debug
)
2406 ddebug_remove_module(debug
->modname
);
2409 void * __weak
module_alloc(unsigned long size
)
2411 return vmalloc_exec(size
);
2414 static void *module_alloc_update_bounds(unsigned long size
)
2416 void *ret
= module_alloc(size
);
2419 mutex_lock(&module_mutex
);
2420 /* Update module bounds. */
2421 if ((unsigned long)ret
< module_addr_min
)
2422 module_addr_min
= (unsigned long)ret
;
2423 if ((unsigned long)ret
+ size
> module_addr_max
)
2424 module_addr_max
= (unsigned long)ret
+ size
;
2425 mutex_unlock(&module_mutex
);
2430 #ifdef CONFIG_DEBUG_KMEMLEAK
2431 static void kmemleak_load_module(const struct module
*mod
,
2432 const struct load_info
*info
)
2436 /* only scan the sections containing data */
2437 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2439 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2440 /* Scan all writable sections that's not executable */
2441 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
2442 !(info
->sechdrs
[i
].sh_flags
& SHF_WRITE
) ||
2443 (info
->sechdrs
[i
].sh_flags
& SHF_EXECINSTR
))
2446 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2447 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2451 static inline void kmemleak_load_module(const struct module
*mod
,
2452 const struct load_info
*info
)
2457 #ifdef CONFIG_MODULE_SIG
2458 static int module_sig_check(struct load_info
*info
)
2461 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2462 const void *mod
= info
->hdr
;
2464 if (info
->len
> markerlen
&&
2465 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2466 /* We truncate the module to discard the signature */
2467 info
->len
-= markerlen
;
2468 err
= mod_verify_sig(mod
, &info
->len
);
2472 info
->sig_ok
= true;
2476 /* Not having a signature is only an error if we're strict. */
2477 if (err
< 0 && fips_enabled
)
2478 panic("Module verification failed with error %d in FIPS mode\n",
2480 if (err
== -ENOKEY
&& !sig_enforce
)
2485 #else /* !CONFIG_MODULE_SIG */
2486 static int module_sig_check(struct load_info
*info
)
2490 #endif /* !CONFIG_MODULE_SIG */
2492 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2493 static int elf_header_check(struct load_info
*info
)
2495 if (info
->len
< sizeof(*(info
->hdr
)))
2498 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2499 || info
->hdr
->e_type
!= ET_REL
2500 || !elf_check_arch(info
->hdr
)
2501 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2504 if (info
->hdr
->e_shoff
>= info
->len
2505 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2506 info
->len
- info
->hdr
->e_shoff
))
2512 /* Sets info->hdr and info->len. */
2513 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2514 struct load_info
*info
)
2519 if (info
->len
< sizeof(*(info
->hdr
)))
2522 err
= security_kernel_module_from_file(NULL
);
2526 /* Suck in entire file: we'll want most of it. */
2527 info
->hdr
= vmalloc(info
->len
);
2531 if (copy_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2539 /* Sets info->hdr and info->len. */
2540 static int copy_module_from_fd(int fd
, struct load_info
*info
)
2552 err
= security_kernel_module_from_file(file
);
2556 err
= vfs_getattr(&file
->f_path
, &stat
);
2560 if (stat
.size
> INT_MAX
) {
2565 /* Don't hand 0 to vmalloc, it whines. */
2566 if (stat
.size
== 0) {
2571 info
->hdr
= vmalloc(stat
.size
);
2578 while (pos
< stat
.size
) {
2579 bytes
= kernel_read(file
, pos
, (char *)(info
->hdr
) + pos
,
2597 static void free_copy(struct load_info
*info
)
2602 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2606 /* This should always be true, but let's be sure. */
2607 info
->sechdrs
[0].sh_addr
= 0;
2609 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2610 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2611 if (shdr
->sh_type
!= SHT_NOBITS
2612 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2613 printk(KERN_ERR
"Module len %lu truncated\n",
2618 /* Mark all sections sh_addr with their address in the
2620 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2622 #ifndef CONFIG_MODULE_UNLOAD
2623 /* Don't load .exit sections */
2624 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2625 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2629 /* Track but don't keep modinfo and version sections. */
2630 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2631 info
->index
.vers
= 0; /* Pretend no __versions section! */
2633 info
->index
.vers
= find_sec(info
, "__versions");
2634 info
->index
.info
= find_sec(info
, ".modinfo");
2635 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2636 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2641 * Set up our basic convenience variables (pointers to section headers,
2642 * search for module section index etc), and do some basic section
2645 * Return the temporary module pointer (we'll replace it with the final
2646 * one when we move the module sections around).
2648 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2654 /* Set up the convenience variables */
2655 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2656 info
->secstrings
= (void *)info
->hdr
2657 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2659 err
= rewrite_section_headers(info
, flags
);
2661 return ERR_PTR(err
);
2663 /* Find internal symbols and strings. */
2664 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2665 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2666 info
->index
.sym
= i
;
2667 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2668 info
->strtab
= (char *)info
->hdr
2669 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2674 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2675 if (!info
->index
.mod
) {
2676 printk(KERN_WARNING
"No module found in object\n");
2677 return ERR_PTR(-ENOEXEC
);
2679 /* This is temporary: point mod into copy of data. */
2680 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2682 if (info
->index
.sym
== 0) {
2683 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2685 return ERR_PTR(-ENOEXEC
);
2688 info
->index
.pcpu
= find_pcpusec(info
);
2690 /* Check module struct version now, before we try to use module. */
2691 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2692 return ERR_PTR(-ENOEXEC
);
2697 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2699 const char *modmagic
= get_modinfo(info
, "vermagic");
2702 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2705 /* This is allowed: modprobe --force will invalidate it. */
2707 err
= try_to_force_load(mod
, "bad vermagic");
2710 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2711 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2712 mod
->name
, modmagic
, vermagic
);
2716 if (!get_modinfo(info
, "intree"))
2717 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2719 if (get_modinfo(info
, "staging")) {
2720 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2721 printk(KERN_WARNING
"%s: module is from the staging directory,"
2722 " the quality is unknown, you have been warned.\n",
2726 /* Set up license info based on the info section */
2727 set_license(mod
, get_modinfo(info
, "license"));
2732 static void find_module_sections(struct module
*mod
, struct load_info
*info
)
2734 mod
->kp
= section_objs(info
, "__param",
2735 sizeof(*mod
->kp
), &mod
->num_kp
);
2736 mod
->syms
= section_objs(info
, "__ksymtab",
2737 sizeof(*mod
->syms
), &mod
->num_syms
);
2738 mod
->crcs
= section_addr(info
, "__kcrctab");
2739 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2740 sizeof(*mod
->gpl_syms
),
2741 &mod
->num_gpl_syms
);
2742 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2743 mod
->gpl_future_syms
= section_objs(info
,
2744 "__ksymtab_gpl_future",
2745 sizeof(*mod
->gpl_future_syms
),
2746 &mod
->num_gpl_future_syms
);
2747 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2749 #ifdef CONFIG_UNUSED_SYMBOLS
2750 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2751 sizeof(*mod
->unused_syms
),
2752 &mod
->num_unused_syms
);
2753 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2754 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2755 sizeof(*mod
->unused_gpl_syms
),
2756 &mod
->num_unused_gpl_syms
);
2757 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2759 #ifdef CONFIG_CONSTRUCTORS
2760 mod
->ctors
= section_objs(info
, ".ctors",
2761 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2764 #ifdef CONFIG_TRACEPOINTS
2765 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2766 sizeof(*mod
->tracepoints_ptrs
),
2767 &mod
->num_tracepoints
);
2769 #ifdef HAVE_JUMP_LABEL
2770 mod
->jump_entries
= section_objs(info
, "__jump_table",
2771 sizeof(*mod
->jump_entries
),
2772 &mod
->num_jump_entries
);
2774 #ifdef CONFIG_EVENT_TRACING
2775 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2776 sizeof(*mod
->trace_events
),
2777 &mod
->num_trace_events
);
2779 #ifdef CONFIG_TRACING
2780 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2781 sizeof(*mod
->trace_bprintk_fmt_start
),
2782 &mod
->num_trace_bprintk_fmt
);
2784 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2785 /* sechdrs[0].sh_size is always zero */
2786 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2787 sizeof(*mod
->ftrace_callsites
),
2788 &mod
->num_ftrace_callsites
);
2791 mod
->extable
= section_objs(info
, "__ex_table",
2792 sizeof(*mod
->extable
), &mod
->num_exentries
);
2794 if (section_addr(info
, "__obsparm"))
2795 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2798 info
->debug
= section_objs(info
, "__verbose",
2799 sizeof(*info
->debug
), &info
->num_debug
);
2802 static int move_module(struct module
*mod
, struct load_info
*info
)
2807 /* Do the allocs. */
2808 ptr
= module_alloc_update_bounds(mod
->core_size
);
2810 * The pointer to this block is stored in the module structure
2811 * which is inside the block. Just mark it as not being a
2814 kmemleak_not_leak(ptr
);
2818 memset(ptr
, 0, mod
->core_size
);
2819 mod
->module_core
= ptr
;
2821 if (mod
->init_size
) {
2822 ptr
= module_alloc_update_bounds(mod
->init_size
);
2824 * The pointer to this block is stored in the module structure
2825 * which is inside the block. This block doesn't need to be
2826 * scanned as it contains data and code that will be freed
2827 * after the module is initialized.
2829 kmemleak_ignore(ptr
);
2831 module_free(mod
, mod
->module_core
);
2834 memset(ptr
, 0, mod
->init_size
);
2835 mod
->module_init
= ptr
;
2837 mod
->module_init
= NULL
;
2839 /* Transfer each section which specifies SHF_ALLOC */
2840 pr_debug("final section addresses:\n");
2841 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
2843 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2845 if (!(shdr
->sh_flags
& SHF_ALLOC
))
2848 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
2849 dest
= mod
->module_init
2850 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
2852 dest
= mod
->module_core
+ shdr
->sh_entsize
;
2854 if (shdr
->sh_type
!= SHT_NOBITS
)
2855 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
2856 /* Update sh_addr to point to copy in image. */
2857 shdr
->sh_addr
= (unsigned long)dest
;
2858 pr_debug("\t0x%lx %s\n",
2859 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
2865 static int check_module_license_and_versions(struct module
*mod
)
2868 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2869 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2870 * using GPL-only symbols it needs.
2872 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2873 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
2875 /* driverloader was caught wrongly pretending to be under GPL */
2876 if (strcmp(mod
->name
, "driverloader") == 0)
2877 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2878 LOCKDEP_NOW_UNRELIABLE
);
2880 /* lve claims to be GPL but upstream won't provide source */
2881 if (strcmp(mod
->name
, "lve") == 0)
2882 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2883 LOCKDEP_NOW_UNRELIABLE
);
2885 #ifdef CONFIG_MODVERSIONS
2886 if ((mod
->num_syms
&& !mod
->crcs
)
2887 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2888 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2889 #ifdef CONFIG_UNUSED_SYMBOLS
2890 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2891 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2894 return try_to_force_load(mod
,
2895 "no versions for exported symbols");
2901 static void flush_module_icache(const struct module
*mod
)
2903 mm_segment_t old_fs
;
2905 /* flush the icache in correct context */
2910 * Flush the instruction cache, since we've played with text.
2911 * Do it before processing of module parameters, so the module
2912 * can provide parameter accessor functions of its own.
2914 if (mod
->module_init
)
2915 flush_icache_range((unsigned long)mod
->module_init
,
2916 (unsigned long)mod
->module_init
2918 flush_icache_range((unsigned long)mod
->module_core
,
2919 (unsigned long)mod
->module_core
+ mod
->core_size
);
2924 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
2932 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
2934 /* Module within temporary copy. */
2938 mod
= setup_load_info(info
, flags
);
2942 err
= check_modinfo(mod
, info
, flags
);
2944 return ERR_PTR(err
);
2946 /* Allow arches to frob section contents and sizes. */
2947 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
2948 info
->secstrings
, mod
);
2950 return ERR_PTR(err
);
2952 /* We will do a special allocation for per-cpu sections later. */
2953 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2955 /* Determine total sizes, and put offsets in sh_entsize. For now
2956 this is done generically; there doesn't appear to be any
2957 special cases for the architectures. */
2958 layout_sections(mod
, info
);
2959 layout_symtab(mod
, info
);
2961 /* Allocate and move to the final place */
2962 err
= move_module(mod
, info
);
2964 return ERR_PTR(err
);
2966 /* Module has been copied to its final place now: return it. */
2967 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2968 kmemleak_load_module(mod
, info
);
2972 static int alloc_module_percpu(struct module
*mod
, struct load_info
*info
)
2974 Elf_Shdr
*pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
2975 if (!pcpusec
->sh_size
)
2978 /* We have a special allocation for this section. */
2979 return percpu_modalloc(mod
, pcpusec
->sh_size
, pcpusec
->sh_addralign
);
2982 /* mod is no longer valid after this! */
2983 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
2985 percpu_modfree(mod
);
2986 module_free(mod
, mod
->module_init
);
2987 module_free(mod
, mod
->module_core
);
2990 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
2991 const Elf_Shdr
*sechdrs
,
2997 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
2999 /* Sort exception table now relocations are done. */
3000 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
3002 /* Copy relocated percpu area over. */
3003 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
3004 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
3006 /* Setup kallsyms-specific fields. */
3007 add_kallsyms(mod
, info
);
3009 /* Arch-specific module finalizing. */
3010 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3013 /* Is this module of this name done loading? No locks held. */
3014 static bool finished_loading(const char *name
)
3019 mutex_lock(&module_mutex
);
3020 mod
= find_module_all(name
, true);
3021 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3022 || mod
->state
== MODULE_STATE_GOING
;
3023 mutex_unlock(&module_mutex
);
3028 /* Call module constructors. */
3029 static void do_mod_ctors(struct module
*mod
)
3031 #ifdef CONFIG_CONSTRUCTORS
3034 for (i
= 0; i
< mod
->num_ctors
; i
++)
3039 /* This is where the real work happens */
3040 static int do_init_module(struct module
*mod
)
3045 * We want to find out whether @mod uses async during init. Clear
3046 * PF_USED_ASYNC. async_schedule*() will set it.
3048 current
->flags
&= ~PF_USED_ASYNC
;
3050 blocking_notifier_call_chain(&module_notify_list
,
3051 MODULE_STATE_COMING
, mod
);
3053 /* Set RO and NX regions for core */
3054 set_section_ro_nx(mod
->module_core
,
3055 mod
->core_text_size
,
3059 /* Set RO and NX regions for init */
3060 set_section_ro_nx(mod
->module_init
,
3061 mod
->init_text_size
,
3066 /* Start the module */
3067 if (mod
->init
!= NULL
)
3068 ret
= do_one_initcall(mod
->init
);
3070 /* Init routine failed: abort. Try to protect us from
3071 buggy refcounters. */
3072 mod
->state
= MODULE_STATE_GOING
;
3073 synchronize_sched();
3075 blocking_notifier_call_chain(&module_notify_list
,
3076 MODULE_STATE_GOING
, mod
);
3078 wake_up_all(&module_wq
);
3083 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3084 "%s: loading module anyway...\n",
3085 __func__
, mod
->name
, ret
,
3090 /* Now it's a first class citizen! */
3091 mod
->state
= MODULE_STATE_LIVE
;
3092 blocking_notifier_call_chain(&module_notify_list
,
3093 MODULE_STATE_LIVE
, mod
);
3096 * We need to finish all async code before the module init sequence
3097 * is done. This has potential to deadlock. For example, a newly
3098 * detected block device can trigger request_module() of the
3099 * default iosched from async probing task. Once userland helper
3100 * reaches here, async_synchronize_full() will wait on the async
3101 * task waiting on request_module() and deadlock.
3103 * This deadlock is avoided by perfomring async_synchronize_full()
3104 * iff module init queued any async jobs. This isn't a full
3105 * solution as it will deadlock the same if module loading from
3106 * async jobs nests more than once; however, due to the various
3107 * constraints, this hack seems to be the best option for now.
3108 * Please refer to the following thread for details.
3110 * http://thread.gmane.org/gmane.linux.kernel/1420814
3112 if (current
->flags
& PF_USED_ASYNC
)
3113 async_synchronize_full();
3115 mutex_lock(&module_mutex
);
3116 /* Drop initial reference. */
3118 trim_init_extable(mod
);
3119 #ifdef CONFIG_KALLSYMS
3120 mod
->num_symtab
= mod
->core_num_syms
;
3121 mod
->symtab
= mod
->core_symtab
;
3122 mod
->strtab
= mod
->core_strtab
;
3124 unset_module_init_ro_nx(mod
);
3125 module_free(mod
, mod
->module_init
);
3126 mod
->module_init
= NULL
;
3128 mod
->init_ro_size
= 0;
3129 mod
->init_text_size
= 0;
3130 mutex_unlock(&module_mutex
);
3131 wake_up_all(&module_wq
);
3136 static int may_init_module(void)
3138 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3145 * We try to place it in the list now to make sure it's unique before
3146 * we dedicate too many resources. In particular, temporary percpu
3147 * memory exhaustion.
3149 static int add_unformed_module(struct module
*mod
)
3154 mod
->state
= MODULE_STATE_UNFORMED
;
3157 mutex_lock(&module_mutex
);
3158 if ((old
= find_module_all(mod
->name
, true)) != NULL
) {
3159 if (old
->state
== MODULE_STATE_COMING
3160 || old
->state
== MODULE_STATE_UNFORMED
) {
3161 /* Wait in case it fails to load. */
3162 mutex_unlock(&module_mutex
);
3163 err
= wait_event_interruptible(module_wq
,
3164 finished_loading(mod
->name
));
3172 list_add_rcu(&mod
->list
, &modules
);
3176 mutex_unlock(&module_mutex
);
3181 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3185 mutex_lock(&module_mutex
);
3187 /* Find duplicate symbols (must be called under lock). */
3188 err
= verify_export_symbols(mod
);
3192 /* This relies on module_mutex for list integrity. */
3193 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3195 /* Mark state as coming so strong_try_module_get() ignores us,
3196 * but kallsyms etc. can see us. */
3197 mod
->state
= MODULE_STATE_COMING
;
3200 mutex_unlock(&module_mutex
);
3204 /* Allocate and load the module: note that size of section 0 is always
3205 zero, and we rely on this for optional sections. */
3206 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3212 err
= module_sig_check(info
);
3216 err
= elf_header_check(info
);
3220 /* Figure out module layout, and allocate all the memory. */
3221 mod
= layout_and_allocate(info
, flags
);
3227 /* Reserve our place in the list. */
3228 err
= add_unformed_module(mod
);
3232 #ifdef CONFIG_MODULE_SIG
3233 mod
->sig_ok
= info
->sig_ok
;
3235 printk_once(KERN_NOTICE
3236 "%s: module verification failed: signature and/or"
3237 " required key missing - tainting kernel\n",
3239 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_STILL_OK
);
3243 /* To avoid stressing percpu allocator, do this once we're unique. */
3244 err
= alloc_module_percpu(mod
, info
);
3248 /* Now module is in final location, initialize linked lists, etc. */
3249 err
= module_unload_init(mod
);
3253 /* Now we've got everything in the final locations, we can
3254 * find optional sections. */
3255 find_module_sections(mod
, info
);
3257 err
= check_module_license_and_versions(mod
);
3261 /* Set up MODINFO_ATTR fields */
3262 setup_modinfo(mod
, info
);
3264 /* Fix up syms, so that st_value is a pointer to location. */
3265 err
= simplify_symbols(mod
, info
);
3269 err
= apply_relocations(mod
, info
);
3273 err
= post_relocation(mod
, info
);
3277 flush_module_icache(mod
);
3279 /* Now copy in args */
3280 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3281 if (IS_ERR(mod
->args
)) {
3282 err
= PTR_ERR(mod
->args
);
3283 goto free_arch_cleanup
;
3286 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3288 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3289 ftrace_module_init(mod
);
3291 /* Finally it's fully formed, ready to start executing. */
3292 err
= complete_formation(mod
, info
);
3294 goto ddebug_cleanup
;
3296 /* Module is ready to execute: parsing args may do that. */
3297 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3298 -32768, 32767, &ddebug_dyndbg_module_param_cb
);
3302 /* Link in to syfs. */
3303 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3307 /* Get rid of temporary copy. */
3311 trace_module_load(mod
);
3313 return do_init_module(mod
);
3316 /* module_bug_cleanup needs module_mutex protection */
3317 mutex_lock(&module_mutex
);
3318 module_bug_cleanup(mod
);
3319 mutex_unlock(&module_mutex
);
3321 dynamic_debug_remove(info
->debug
);
3322 synchronize_sched();
3325 module_arch_cleanup(mod
);
3329 module_unload_free(mod
);
3331 mutex_lock(&module_mutex
);
3332 /* Unlink carefully: kallsyms could be walking list. */
3333 list_del_rcu(&mod
->list
);
3334 wake_up_all(&module_wq
);
3335 mutex_unlock(&module_mutex
);
3337 module_deallocate(mod
, info
);
3343 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3344 unsigned long, len
, const char __user
*, uargs
)
3347 struct load_info info
= { };
3349 err
= may_init_module();
3353 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3356 err
= copy_module_from_user(umod
, len
, &info
);
3360 return load_module(&info
, uargs
, 0);
3363 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3366 struct load_info info
= { };
3368 err
= may_init_module();
3372 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3374 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3375 |MODULE_INIT_IGNORE_VERMAGIC
))
3378 err
= copy_module_from_fd(fd
, &info
);
3382 return load_module(&info
, uargs
, flags
);
3385 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3387 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3390 #ifdef CONFIG_KALLSYMS
3392 * This ignores the intensely annoying "mapping symbols" found
3393 * in ARM ELF files: $a, $t and $d.
3395 static inline int is_arm_mapping_symbol(const char *str
)
3397 return str
[0] == '$' && strchr("atd", str
[1])
3398 && (str
[2] == '\0' || str
[2] == '.');
3401 static const char *get_ksymbol(struct module
*mod
,
3403 unsigned long *size
,
3404 unsigned long *offset
)
3406 unsigned int i
, best
= 0;
3407 unsigned long nextval
;
3409 /* At worse, next value is at end of module */
3410 if (within_module_init(addr
, mod
))
3411 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
3413 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
3415 /* Scan for closest preceding symbol, and next symbol. (ELF
3416 starts real symbols at 1). */
3417 for (i
= 1; i
< mod
->num_symtab
; i
++) {
3418 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3421 /* We ignore unnamed symbols: they're uninformative
3422 * and inserted at a whim. */
3423 if (mod
->symtab
[i
].st_value
<= addr
3424 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
3425 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3426 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3428 if (mod
->symtab
[i
].st_value
> addr
3429 && mod
->symtab
[i
].st_value
< nextval
3430 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3431 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3432 nextval
= mod
->symtab
[i
].st_value
;
3439 *size
= nextval
- mod
->symtab
[best
].st_value
;
3441 *offset
= addr
- mod
->symtab
[best
].st_value
;
3442 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
3445 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3446 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3447 const char *module_address_lookup(unsigned long addr
,
3448 unsigned long *size
,
3449 unsigned long *offset
,
3454 const char *ret
= NULL
;
3457 list_for_each_entry_rcu(mod
, &modules
, list
) {
3458 if (mod
->state
== MODULE_STATE_UNFORMED
)
3460 if (within_module_init(addr
, mod
) ||
3461 within_module_core(addr
, mod
)) {
3463 *modname
= mod
->name
;
3464 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3468 /* Make a copy in here where it's safe */
3470 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3477 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3482 list_for_each_entry_rcu(mod
, &modules
, list
) {
3483 if (mod
->state
== MODULE_STATE_UNFORMED
)
3485 if (within_module_init(addr
, mod
) ||
3486 within_module_core(addr
, mod
)) {
3489 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3492 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3502 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3503 unsigned long *offset
, char *modname
, char *name
)
3508 list_for_each_entry_rcu(mod
, &modules
, list
) {
3509 if (mod
->state
== MODULE_STATE_UNFORMED
)
3511 if (within_module_init(addr
, mod
) ||
3512 within_module_core(addr
, mod
)) {
3515 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3519 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3521 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3531 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3532 char *name
, char *module_name
, int *exported
)
3537 list_for_each_entry_rcu(mod
, &modules
, list
) {
3538 if (mod
->state
== MODULE_STATE_UNFORMED
)
3540 if (symnum
< mod
->num_symtab
) {
3541 *value
= mod
->symtab
[symnum
].st_value
;
3542 *type
= mod
->symtab
[symnum
].st_info
;
3543 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
3545 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3546 *exported
= is_exported(name
, *value
, mod
);
3550 symnum
-= mod
->num_symtab
;
3556 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3560 for (i
= 0; i
< mod
->num_symtab
; i
++)
3561 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
3562 mod
->symtab
[i
].st_info
!= 'U')
3563 return mod
->symtab
[i
].st_value
;
3567 /* Look for this name: can be of form module:name. */
3568 unsigned long module_kallsyms_lookup_name(const char *name
)
3572 unsigned long ret
= 0;
3574 /* Don't lock: we're in enough trouble already. */
3576 if ((colon
= strchr(name
, ':')) != NULL
) {
3578 if ((mod
= find_module(name
)) != NULL
)
3579 ret
= mod_find_symname(mod
, colon
+1);
3582 list_for_each_entry_rcu(mod
, &modules
, list
) {
3583 if (mod
->state
== MODULE_STATE_UNFORMED
)
3585 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3593 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3594 struct module
*, unsigned long),
3601 list_for_each_entry(mod
, &modules
, list
) {
3602 if (mod
->state
== MODULE_STATE_UNFORMED
)
3604 for (i
= 0; i
< mod
->num_symtab
; i
++) {
3605 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
3606 mod
, mod
->symtab
[i
].st_value
);
3613 #endif /* CONFIG_KALLSYMS */
3615 static char *module_flags(struct module
*mod
, char *buf
)
3619 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
3621 mod
->state
== MODULE_STATE_GOING
||
3622 mod
->state
== MODULE_STATE_COMING
) {
3624 bx
+= module_flags_taint(mod
, buf
+ bx
);
3625 /* Show a - for module-is-being-unloaded */
3626 if (mod
->state
== MODULE_STATE_GOING
)
3628 /* Show a + for module-is-being-loaded */
3629 if (mod
->state
== MODULE_STATE_COMING
)
3638 #ifdef CONFIG_PROC_FS
3639 /* Called by the /proc file system to return a list of modules. */
3640 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3642 mutex_lock(&module_mutex
);
3643 return seq_list_start(&modules
, *pos
);
3646 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3648 return seq_list_next(p
, &modules
, pos
);
3651 static void m_stop(struct seq_file
*m
, void *p
)
3653 mutex_unlock(&module_mutex
);
3656 static int m_show(struct seq_file
*m
, void *p
)
3658 struct module
*mod
= list_entry(p
, struct module
, list
);
3661 /* We always ignore unformed modules. */
3662 if (mod
->state
== MODULE_STATE_UNFORMED
)
3665 seq_printf(m
, "%s %u",
3666 mod
->name
, mod
->init_size
+ mod
->core_size
);
3667 print_unload_info(m
, mod
);
3669 /* Informative for users. */
3670 seq_printf(m
, " %s",
3671 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3672 mod
->state
== MODULE_STATE_COMING
? "Loading":
3674 /* Used by oprofile and other similar tools. */
3675 seq_printf(m
, " 0x%pK", mod
->module_core
);
3679 seq_printf(m
, " %s", module_flags(mod
, buf
));
3681 seq_printf(m
, "\n");
3685 /* Format: modulename size refcount deps address
3687 Where refcount is a number or -, and deps is a comma-separated list
3690 static const struct seq_operations modules_op
= {
3697 static int modules_open(struct inode
*inode
, struct file
*file
)
3699 return seq_open(file
, &modules_op
);
3702 static const struct file_operations proc_modules_operations
= {
3703 .open
= modules_open
,
3705 .llseek
= seq_lseek
,
3706 .release
= seq_release
,
3709 static int __init
proc_modules_init(void)
3711 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3714 module_init(proc_modules_init
);
3717 /* Given an address, look for it in the module exception tables. */
3718 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3720 const struct exception_table_entry
*e
= NULL
;
3724 list_for_each_entry_rcu(mod
, &modules
, list
) {
3725 if (mod
->state
== MODULE_STATE_UNFORMED
)
3727 if (mod
->num_exentries
== 0)
3730 e
= search_extable(mod
->extable
,
3731 mod
->extable
+ mod
->num_exentries
- 1,
3738 /* Now, if we found one, we are running inside it now, hence
3739 we cannot unload the module, hence no refcnt needed. */
3744 * is_module_address - is this address inside a module?
3745 * @addr: the address to check.
3747 * See is_module_text_address() if you simply want to see if the address
3748 * is code (not data).
3750 bool is_module_address(unsigned long addr
)
3755 ret
= __module_address(addr
) != NULL
;
3762 * __module_address - get the module which contains an address.
3763 * @addr: the address.
3765 * Must be called with preempt disabled or module mutex held so that
3766 * module doesn't get freed during this.
3768 struct module
*__module_address(unsigned long addr
)
3772 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3775 list_for_each_entry_rcu(mod
, &modules
, list
) {
3776 if (mod
->state
== MODULE_STATE_UNFORMED
)
3778 if (within_module_core(addr
, mod
)
3779 || within_module_init(addr
, mod
))
3784 EXPORT_SYMBOL_GPL(__module_address
);
3787 * is_module_text_address - is this address inside module code?
3788 * @addr: the address to check.
3790 * See is_module_address() if you simply want to see if the address is
3791 * anywhere in a module. See kernel_text_address() for testing if an
3792 * address corresponds to kernel or module code.
3794 bool is_module_text_address(unsigned long addr
)
3799 ret
= __module_text_address(addr
) != NULL
;
3806 * __module_text_address - get the module whose code contains an address.
3807 * @addr: the address.
3809 * Must be called with preempt disabled or module mutex held so that
3810 * module doesn't get freed during this.
3812 struct module
*__module_text_address(unsigned long addr
)
3814 struct module
*mod
= __module_address(addr
);
3816 /* Make sure it's within the text section. */
3817 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3818 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3823 EXPORT_SYMBOL_GPL(__module_text_address
);
3825 /* Don't grab lock, we're oopsing. */
3826 void print_modules(void)
3831 printk(KERN_DEFAULT
"Modules linked in:");
3832 /* Most callers should already have preempt disabled, but make sure */
3834 list_for_each_entry_rcu(mod
, &modules
, list
) {
3835 if (mod
->state
== MODULE_STATE_UNFORMED
)
3837 printk(" %s %p %s", mod
->name
, mod
->module_core
, module_flags(mod
, buf
));
3840 if (last_unloaded_module
[0])
3841 printk(" [last unloaded: %s]", last_unloaded_module
);
3845 #ifdef CONFIG_MODVERSIONS
3846 /* Generate the signature for all relevant module structures here.
3847 * If these change, we don't want to try to parse the module. */
3848 void module_layout(struct module
*mod
,
3849 struct modversion_info
*ver
,
3850 struct kernel_param
*kp
,
3851 struct kernel_symbol
*ks
,
3852 struct tracepoint
* const *tp
)
3855 EXPORT_SYMBOL(module_layout
);