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/seq_file.h>
33 #include <linux/syscalls.h>
34 #include <linux/fcntl.h>
35 #include <linux/rcupdate.h>
36 #include <linux/capability.h>
37 #include <linux/cpu.h>
38 #include <linux/moduleparam.h>
39 #include <linux/errno.h>
40 #include <linux/err.h>
41 #include <linux/vermagic.h>
42 #include <linux/notifier.h>
43 #include <linux/sched.h>
44 #include <linux/stop_machine.h>
45 #include <linux/device.h>
46 #include <linux/string.h>
47 #include <linux/mutex.h>
48 #include <linux/rculist.h>
49 #include <asm/uaccess.h>
50 #include <asm/cacheflush.h>
51 #include <asm/mmu_context.h>
52 #include <linux/license.h>
53 #include <asm/sections.h>
54 #include <linux/tracepoint.h>
55 #include <linux/ftrace.h>
56 #include <linux/async.h>
57 #include <linux/percpu.h>
58 #include <linux/kmemleak.h>
59 #include <linux/jump_label.h>
60 #include <linux/pfn.h>
61 #include <linux/bsearch.h>
62 #include <linux/fips.h>
63 #include <uapi/linux/module.h>
64 #include "module-internal.h"
66 #define CREATE_TRACE_POINTS
67 #include <trace/events/module.h>
69 #ifndef ARCH_SHF_SMALL
70 #define ARCH_SHF_SMALL 0
74 * Modules' sections will be aligned on page boundaries
75 * to ensure complete separation of code and data, but
76 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
78 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
79 # define debug_align(X) ALIGN(X, PAGE_SIZE)
81 # define debug_align(X) (X)
85 * Given BASE and SIZE this macro calculates the number of pages the
86 * memory regions occupies
88 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
89 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
90 PFN_DOWN((unsigned long)BASE) + 1) \
93 /* If this is set, the section belongs in the init part of the module */
94 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
98 * 1) List of modules (also safely readable with preempt_disable),
99 * 2) module_use links,
100 * 3) module_addr_min/module_addr_max.
101 * (delete uses stop_machine/add uses RCU list operations). */
102 DEFINE_MUTEX(module_mutex
);
103 EXPORT_SYMBOL_GPL(module_mutex
);
104 static LIST_HEAD(modules
);
105 #ifdef CONFIG_KGDB_KDB
106 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
107 #endif /* CONFIG_KGDB_KDB */
109 #ifdef CONFIG_MODULE_SIG
110 #ifdef CONFIG_MODULE_SIG_FORCE
111 static bool sig_enforce
= true;
113 static bool sig_enforce
= false;
115 static int param_set_bool_enable_only(const char *val
,
116 const struct kernel_param
*kp
)
120 struct kernel_param dummy_kp
= *kp
;
122 dummy_kp
.arg
= &test
;
124 err
= param_set_bool(val
, &dummy_kp
);
128 /* Don't let them unset it once it's set! */
129 if (!test
&& sig_enforce
)
137 static const struct kernel_param_ops param_ops_bool_enable_only
= {
138 .set
= param_set_bool_enable_only
,
139 .get
= param_get_bool
,
141 #define param_check_bool_enable_only param_check_bool
143 module_param(sig_enforce
, bool_enable_only
, 0644);
144 #endif /* !CONFIG_MODULE_SIG_FORCE */
145 #endif /* CONFIG_MODULE_SIG */
147 /* Block module loading/unloading? */
148 int modules_disabled
= 0;
149 core_param(nomodule
, modules_disabled
, bint
, 0);
151 /* Waiting for a module to finish initializing? */
152 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
154 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
156 /* Bounds of module allocation, for speeding __module_address.
157 * Protected by module_mutex. */
158 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
160 int register_module_notifier(struct notifier_block
* nb
)
162 return blocking_notifier_chain_register(&module_notify_list
, nb
);
164 EXPORT_SYMBOL(register_module_notifier
);
166 int unregister_module_notifier(struct notifier_block
* nb
)
168 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
170 EXPORT_SYMBOL(unregister_module_notifier
);
176 char *secstrings
, *strtab
;
177 unsigned long symoffs
, stroffs
;
178 struct _ddebug
*debug
;
179 unsigned int num_debug
;
182 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
186 /* We require a truly strong try_module_get(): 0 means failure due to
187 ongoing or failed initialization etc. */
188 static inline int strong_try_module_get(struct module
*mod
)
190 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
192 if (try_module_get(mod
))
198 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
201 mod
->taints
|= (1U << flag
);
205 * A thread that wants to hold a reference to a module only while it
206 * is running can call this to safely exit. nfsd and lockd use this.
208 void __module_put_and_exit(struct module
*mod
, long code
)
213 EXPORT_SYMBOL(__module_put_and_exit
);
215 /* Find a module section: 0 means not found. */
216 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
220 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
221 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
222 /* Alloc bit cleared means "ignore it." */
223 if ((shdr
->sh_flags
& SHF_ALLOC
)
224 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
230 /* Find a module section, or NULL. */
231 static void *section_addr(const struct load_info
*info
, const char *name
)
233 /* Section 0 has sh_addr 0. */
234 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
237 /* Find a module section, or NULL. Fill in number of "objects" in section. */
238 static void *section_objs(const struct load_info
*info
,
243 unsigned int sec
= find_sec(info
, name
);
245 /* Section 0 has sh_addr 0 and sh_size 0. */
246 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
247 return (void *)info
->sechdrs
[sec
].sh_addr
;
250 /* Provided by the linker */
251 extern const struct kernel_symbol __start___ksymtab
[];
252 extern const struct kernel_symbol __stop___ksymtab
[];
253 extern const struct kernel_symbol __start___ksymtab_gpl
[];
254 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
255 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
256 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
257 extern const unsigned long __start___kcrctab
[];
258 extern const unsigned long __start___kcrctab_gpl
[];
259 extern const unsigned long __start___kcrctab_gpl_future
[];
260 #ifdef CONFIG_UNUSED_SYMBOLS
261 extern const struct kernel_symbol __start___ksymtab_unused
[];
262 extern const struct kernel_symbol __stop___ksymtab_unused
[];
263 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
264 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
265 extern const unsigned long __start___kcrctab_unused
[];
266 extern const unsigned long __start___kcrctab_unused_gpl
[];
269 #ifndef CONFIG_MODVERSIONS
270 #define symversion(base, idx) NULL
272 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
275 static bool each_symbol_in_section(const struct symsearch
*arr
,
276 unsigned int arrsize
,
277 struct module
*owner
,
278 bool (*fn
)(const struct symsearch
*syms
,
279 struct module
*owner
,
285 for (j
= 0; j
< arrsize
; j
++) {
286 if (fn(&arr
[j
], owner
, data
))
293 /* Returns true as soon as fn returns true, otherwise false. */
294 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
295 struct module
*owner
,
300 static const struct symsearch arr
[] = {
301 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
302 NOT_GPL_ONLY
, false },
303 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
304 __start___kcrctab_gpl
,
306 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
307 __start___kcrctab_gpl_future
,
308 WILL_BE_GPL_ONLY
, false },
309 #ifdef CONFIG_UNUSED_SYMBOLS
310 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
311 __start___kcrctab_unused
,
312 NOT_GPL_ONLY
, true },
313 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
314 __start___kcrctab_unused_gpl
,
319 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
322 list_for_each_entry_rcu(mod
, &modules
, list
) {
323 struct symsearch arr
[] = {
324 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
325 NOT_GPL_ONLY
, false },
326 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
329 { mod
->gpl_future_syms
,
330 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
331 mod
->gpl_future_crcs
,
332 WILL_BE_GPL_ONLY
, false },
333 #ifdef CONFIG_UNUSED_SYMBOLS
335 mod
->unused_syms
+ mod
->num_unused_syms
,
337 NOT_GPL_ONLY
, true },
338 { mod
->unused_gpl_syms
,
339 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
340 mod
->unused_gpl_crcs
,
345 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
350 EXPORT_SYMBOL_GPL(each_symbol_section
);
352 struct find_symbol_arg
{
359 struct module
*owner
;
360 const unsigned long *crc
;
361 const struct kernel_symbol
*sym
;
364 static bool check_symbol(const struct symsearch
*syms
,
365 struct module
*owner
,
366 unsigned int symnum
, void *data
)
368 struct find_symbol_arg
*fsa
= data
;
371 if (syms
->licence
== GPL_ONLY
)
373 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
374 printk(KERN_WARNING
"Symbol %s is being used "
375 "by a non-GPL module, which will not "
376 "be allowed in the future\n", fsa
->name
);
377 printk(KERN_WARNING
"Please see the file "
378 "Documentation/feature-removal-schedule.txt "
379 "in the kernel source tree for more details.\n");
383 #ifdef CONFIG_UNUSED_SYMBOLS
384 if (syms
->unused
&& fsa
->warn
) {
385 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
386 "however this module is using it.\n", fsa
->name
);
388 "This symbol will go away in the future.\n");
390 "Please evalute if this is the right api to use and if "
391 "it really is, submit a report the linux kernel "
392 "mailinglist together with submitting your code for "
398 fsa
->crc
= symversion(syms
->crcs
, symnum
);
399 fsa
->sym
= &syms
->start
[symnum
];
403 static int cmp_name(const void *va
, const void *vb
)
406 const struct kernel_symbol
*b
;
408 return strcmp(a
, b
->name
);
411 static bool find_symbol_in_section(const struct symsearch
*syms
,
412 struct module
*owner
,
415 struct find_symbol_arg
*fsa
= data
;
416 struct kernel_symbol
*sym
;
418 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
419 sizeof(struct kernel_symbol
), cmp_name
);
421 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
427 /* Find a symbol and return it, along with, (optional) crc and
428 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
429 const struct kernel_symbol
*find_symbol(const char *name
,
430 struct module
**owner
,
431 const unsigned long **crc
,
435 struct find_symbol_arg fsa
;
441 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
449 pr_debug("Failed to find symbol %s\n", name
);
452 EXPORT_SYMBOL_GPL(find_symbol
);
454 /* Search for module by name: must hold module_mutex. */
455 struct module
*find_module(const char *name
)
459 list_for_each_entry(mod
, &modules
, list
) {
460 if (strcmp(mod
->name
, name
) == 0)
465 EXPORT_SYMBOL_GPL(find_module
);
469 static inline void __percpu
*mod_percpu(struct module
*mod
)
474 static int percpu_modalloc(struct module
*mod
,
475 unsigned long size
, unsigned long align
)
477 if (align
> PAGE_SIZE
) {
478 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
479 mod
->name
, align
, PAGE_SIZE
);
483 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
486 "%s: Could not allocate %lu bytes percpu data\n",
490 mod
->percpu_size
= size
;
494 static void percpu_modfree(struct module
*mod
)
496 free_percpu(mod
->percpu
);
499 static unsigned int find_pcpusec(struct load_info
*info
)
501 return find_sec(info
, ".data..percpu");
504 static void percpu_modcopy(struct module
*mod
,
505 const void *from
, unsigned long size
)
509 for_each_possible_cpu(cpu
)
510 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
514 * is_module_percpu_address - test whether address is from module static percpu
515 * @addr: address to test
517 * Test whether @addr belongs to module static percpu area.
520 * %true if @addr is from module static percpu area
522 bool is_module_percpu_address(unsigned long addr
)
529 list_for_each_entry_rcu(mod
, &modules
, list
) {
530 if (!mod
->percpu_size
)
532 for_each_possible_cpu(cpu
) {
533 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
535 if ((void *)addr
>= start
&&
536 (void *)addr
< start
+ mod
->percpu_size
) {
547 #else /* ... !CONFIG_SMP */
549 static inline void __percpu
*mod_percpu(struct module
*mod
)
553 static inline int percpu_modalloc(struct module
*mod
,
554 unsigned long size
, unsigned long align
)
558 static inline void percpu_modfree(struct module
*mod
)
561 static unsigned int find_pcpusec(struct load_info
*info
)
565 static inline void percpu_modcopy(struct module
*mod
,
566 const void *from
, unsigned long size
)
568 /* pcpusec should be 0, and size of that section should be 0. */
571 bool is_module_percpu_address(unsigned long addr
)
576 #endif /* CONFIG_SMP */
578 #define MODINFO_ATTR(field) \
579 static void setup_modinfo_##field(struct module *mod, const char *s) \
581 mod->field = kstrdup(s, GFP_KERNEL); \
583 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
584 struct module_kobject *mk, char *buffer) \
586 return sprintf(buffer, "%s\n", mk->mod->field); \
588 static int modinfo_##field##_exists(struct module *mod) \
590 return mod->field != NULL; \
592 static void free_modinfo_##field(struct module *mod) \
597 static struct module_attribute modinfo_##field = { \
598 .attr = { .name = __stringify(field), .mode = 0444 }, \
599 .show = show_modinfo_##field, \
600 .setup = setup_modinfo_##field, \
601 .test = modinfo_##field##_exists, \
602 .free = free_modinfo_##field, \
605 MODINFO_ATTR(version
);
606 MODINFO_ATTR(srcversion
);
608 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
610 #ifdef CONFIG_MODULE_UNLOAD
612 EXPORT_TRACEPOINT_SYMBOL(module_get
);
614 /* Init the unload section of the module. */
615 static int module_unload_init(struct module
*mod
)
617 mod
->refptr
= alloc_percpu(struct module_ref
);
621 INIT_LIST_HEAD(&mod
->source_list
);
622 INIT_LIST_HEAD(&mod
->target_list
);
624 /* Hold reference count during initialization. */
625 __this_cpu_write(mod
->refptr
->incs
, 1);
626 /* Backwards compatibility macros put refcount during init. */
627 mod
->waiter
= current
;
632 /* Does a already use b? */
633 static int already_uses(struct module
*a
, struct module
*b
)
635 struct module_use
*use
;
637 list_for_each_entry(use
, &b
->source_list
, source_list
) {
638 if (use
->source
== a
) {
639 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
643 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
649 * - we add 'a' as a "source", 'b' as a "target" of module use
650 * - the module_use is added to the list of 'b' sources (so
651 * 'b' can walk the list to see who sourced them), and of 'a'
652 * targets (so 'a' can see what modules it targets).
654 static int add_module_usage(struct module
*a
, struct module
*b
)
656 struct module_use
*use
;
658 pr_debug("Allocating new usage for %s.\n", a
->name
);
659 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
661 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
667 list_add(&use
->source_list
, &b
->source_list
);
668 list_add(&use
->target_list
, &a
->target_list
);
672 /* Module a uses b: caller needs module_mutex() */
673 int ref_module(struct module
*a
, struct module
*b
)
677 if (b
== NULL
|| already_uses(a
, b
))
680 /* If module isn't available, we fail. */
681 err
= strong_try_module_get(b
);
685 err
= add_module_usage(a
, b
);
692 EXPORT_SYMBOL_GPL(ref_module
);
694 /* Clear the unload stuff of the module. */
695 static void module_unload_free(struct module
*mod
)
697 struct module_use
*use
, *tmp
;
699 mutex_lock(&module_mutex
);
700 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
701 struct module
*i
= use
->target
;
702 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
704 list_del(&use
->source_list
);
705 list_del(&use
->target_list
);
708 mutex_unlock(&module_mutex
);
710 free_percpu(mod
->refptr
);
713 #ifdef CONFIG_MODULE_FORCE_UNLOAD
714 static inline int try_force_unload(unsigned int flags
)
716 int ret
= (flags
& O_TRUNC
);
718 add_taint(TAINT_FORCED_RMMOD
);
722 static inline int try_force_unload(unsigned int flags
)
726 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
735 /* Whole machine is stopped with interrupts off when this runs. */
736 static int __try_stop_module(void *_sref
)
738 struct stopref
*sref
= _sref
;
740 /* If it's not unused, quit unless we're forcing. */
741 if (module_refcount(sref
->mod
) != 0) {
742 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
746 /* Mark it as dying. */
747 sref
->mod
->state
= MODULE_STATE_GOING
;
751 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
753 if (flags
& O_NONBLOCK
) {
754 struct stopref sref
= { mod
, flags
, forced
};
756 return stop_machine(__try_stop_module
, &sref
, NULL
);
758 /* We don't need to stop the machine for this. */
759 mod
->state
= MODULE_STATE_GOING
;
765 unsigned long module_refcount(struct module
*mod
)
767 unsigned long incs
= 0, decs
= 0;
770 for_each_possible_cpu(cpu
)
771 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
773 * ensure the incs are added up after the decs.
774 * module_put ensures incs are visible before decs with smp_wmb.
776 * This 2-count scheme avoids the situation where the refcount
777 * for CPU0 is read, then CPU0 increments the module refcount,
778 * then CPU1 drops that refcount, then the refcount for CPU1 is
779 * read. We would record a decrement but not its corresponding
780 * increment so we would see a low count (disaster).
782 * Rare situation? But module_refcount can be preempted, and we
783 * might be tallying up 4096+ CPUs. So it is not impossible.
786 for_each_possible_cpu(cpu
)
787 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
790 EXPORT_SYMBOL(module_refcount
);
792 /* This exists whether we can unload or not */
793 static void free_module(struct module
*mod
);
795 static void wait_for_zero_refcount(struct module
*mod
)
797 /* Since we might sleep for some time, release the mutex first */
798 mutex_unlock(&module_mutex
);
800 pr_debug("Looking at refcount...\n");
801 set_current_state(TASK_UNINTERRUPTIBLE
);
802 if (module_refcount(mod
) == 0)
806 current
->state
= TASK_RUNNING
;
807 mutex_lock(&module_mutex
);
810 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
814 char name
[MODULE_NAME_LEN
];
817 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
820 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
822 name
[MODULE_NAME_LEN
-1] = '\0';
824 if (mutex_lock_interruptible(&module_mutex
) != 0)
827 mod
= find_module(name
);
833 if (!list_empty(&mod
->source_list
)) {
834 /* Other modules depend on us: get rid of them first. */
839 /* Doing init or already dying? */
840 if (mod
->state
!= MODULE_STATE_LIVE
) {
841 /* FIXME: if (force), slam module count and wake up
843 pr_debug("%s already dying\n", mod
->name
);
848 /* If it has an init func, it must have an exit func to unload */
849 if (mod
->init
&& !mod
->exit
) {
850 forced
= try_force_unload(flags
);
852 /* This module can't be removed */
858 /* Set this up before setting mod->state */
859 mod
->waiter
= current
;
861 /* Stop the machine so refcounts can't move and disable module. */
862 ret
= try_stop_module(mod
, flags
, &forced
);
866 /* Never wait if forced. */
867 if (!forced
&& module_refcount(mod
) != 0)
868 wait_for_zero_refcount(mod
);
870 mutex_unlock(&module_mutex
);
871 /* Final destruction now no one is using it. */
872 if (mod
->exit
!= NULL
)
874 blocking_notifier_call_chain(&module_notify_list
,
875 MODULE_STATE_GOING
, mod
);
876 async_synchronize_full();
878 /* Store the name of the last unloaded module for diagnostic purposes */
879 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
884 mutex_unlock(&module_mutex
);
888 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
890 struct module_use
*use
;
891 int printed_something
= 0;
893 seq_printf(m
, " %lu ", module_refcount(mod
));
895 /* Always include a trailing , so userspace can differentiate
896 between this and the old multi-field proc format. */
897 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
898 printed_something
= 1;
899 seq_printf(m
, "%s,", use
->source
->name
);
902 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
903 printed_something
= 1;
904 seq_printf(m
, "[permanent],");
907 if (!printed_something
)
911 void __symbol_put(const char *symbol
)
913 struct module
*owner
;
916 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
921 EXPORT_SYMBOL(__symbol_put
);
923 /* Note this assumes addr is a function, which it currently always is. */
924 void symbol_put_addr(void *addr
)
926 struct module
*modaddr
;
927 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
929 if (core_kernel_text(a
))
932 /* module_text_address is safe here: we're supposed to have reference
933 * to module from symbol_get, so it can't go away. */
934 modaddr
= __module_text_address(a
);
938 EXPORT_SYMBOL_GPL(symbol_put_addr
);
940 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
941 struct module_kobject
*mk
, char *buffer
)
943 return sprintf(buffer
, "%lu\n", module_refcount(mk
->mod
));
946 static struct module_attribute modinfo_refcnt
=
947 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
949 void __module_get(struct module
*module
)
953 __this_cpu_inc(module
->refptr
->incs
);
954 trace_module_get(module
, _RET_IP_
);
958 EXPORT_SYMBOL(__module_get
);
960 bool try_module_get(struct module
*module
)
967 if (likely(module_is_live(module
))) {
968 __this_cpu_inc(module
->refptr
->incs
);
969 trace_module_get(module
, _RET_IP_
);
977 EXPORT_SYMBOL(try_module_get
);
979 void module_put(struct module
*module
)
983 smp_wmb(); /* see comment in module_refcount */
984 __this_cpu_inc(module
->refptr
->decs
);
986 trace_module_put(module
, _RET_IP_
);
987 /* Maybe they're waiting for us to drop reference? */
988 if (unlikely(!module_is_live(module
)))
989 wake_up_process(module
->waiter
);
993 EXPORT_SYMBOL(module_put
);
995 #else /* !CONFIG_MODULE_UNLOAD */
996 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
998 /* We don't know the usage count, or what modules are using. */
999 seq_printf(m
, " - -");
1002 static inline void module_unload_free(struct module
*mod
)
1006 int ref_module(struct module
*a
, struct module
*b
)
1008 return strong_try_module_get(b
);
1010 EXPORT_SYMBOL_GPL(ref_module
);
1012 static inline int module_unload_init(struct module
*mod
)
1016 #endif /* CONFIG_MODULE_UNLOAD */
1018 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1022 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1024 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1026 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1028 if (mod
->taints
& (1 << TAINT_CRAP
))
1031 * TAINT_FORCED_RMMOD: could be added.
1032 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1038 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1039 struct module_kobject
*mk
, char *buffer
)
1041 const char *state
= "unknown";
1043 switch (mk
->mod
->state
) {
1044 case MODULE_STATE_LIVE
:
1047 case MODULE_STATE_COMING
:
1050 case MODULE_STATE_GOING
:
1054 return sprintf(buffer
, "%s\n", state
);
1057 static struct module_attribute modinfo_initstate
=
1058 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1060 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1061 struct module_kobject
*mk
,
1062 const char *buffer
, size_t count
)
1064 enum kobject_action action
;
1066 if (kobject_action_type(buffer
, count
, &action
) == 0)
1067 kobject_uevent(&mk
->kobj
, action
);
1071 struct module_attribute module_uevent
=
1072 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1074 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1075 struct module_kobject
*mk
, char *buffer
)
1077 return sprintf(buffer
, "%u\n", mk
->mod
->core_size
);
1080 static struct module_attribute modinfo_coresize
=
1081 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1083 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1084 struct module_kobject
*mk
, char *buffer
)
1086 return sprintf(buffer
, "%u\n", mk
->mod
->init_size
);
1089 static struct module_attribute modinfo_initsize
=
1090 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1092 static ssize_t
show_taint(struct module_attribute
*mattr
,
1093 struct module_kobject
*mk
, char *buffer
)
1097 l
= module_flags_taint(mk
->mod
, buffer
);
1102 static struct module_attribute modinfo_taint
=
1103 __ATTR(taint
, 0444, show_taint
, NULL
);
1105 static struct module_attribute
*modinfo_attrs
[] = {
1108 &modinfo_srcversion
,
1113 #ifdef CONFIG_MODULE_UNLOAD
1119 static const char vermagic
[] = VERMAGIC_STRING
;
1121 static int try_to_force_load(struct module
*mod
, const char *reason
)
1123 #ifdef CONFIG_MODULE_FORCE_LOAD
1124 if (!test_taint(TAINT_FORCED_MODULE
))
1125 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
1127 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1134 #ifdef CONFIG_MODVERSIONS
1135 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1136 static unsigned long maybe_relocated(unsigned long crc
,
1137 const struct module
*crc_owner
)
1139 #ifdef ARCH_RELOCATES_KCRCTAB
1140 if (crc_owner
== NULL
)
1141 return crc
- (unsigned long)reloc_start
;
1146 static int check_version(Elf_Shdr
*sechdrs
,
1147 unsigned int versindex
,
1148 const char *symname
,
1150 const unsigned long *crc
,
1151 const struct module
*crc_owner
)
1153 unsigned int i
, num_versions
;
1154 struct modversion_info
*versions
;
1156 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1160 /* No versions at all? modprobe --force does this. */
1162 return try_to_force_load(mod
, symname
) == 0;
1164 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1165 num_versions
= sechdrs
[versindex
].sh_size
1166 / sizeof(struct modversion_info
);
1168 for (i
= 0; i
< num_versions
; i
++) {
1169 if (strcmp(versions
[i
].name
, symname
) != 0)
1172 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1174 pr_debug("Found checksum %lX vs module %lX\n",
1175 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1179 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1180 mod
->name
, symname
);
1184 printk("%s: disagrees about version of symbol %s\n",
1185 mod
->name
, symname
);
1189 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1190 unsigned int versindex
,
1193 const unsigned long *crc
;
1195 /* Since this should be found in kernel (which can't be removed),
1196 * no locking is necessary. */
1197 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1200 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1204 /* First part is kernel version, which we ignore if module has crcs. */
1205 static inline int same_magic(const char *amagic
, const char *bmagic
,
1209 amagic
+= strcspn(amagic
, " ");
1210 bmagic
+= strcspn(bmagic
, " ");
1212 return strcmp(amagic
, bmagic
) == 0;
1215 static inline int check_version(Elf_Shdr
*sechdrs
,
1216 unsigned int versindex
,
1217 const char *symname
,
1219 const unsigned long *crc
,
1220 const struct module
*crc_owner
)
1225 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1226 unsigned int versindex
,
1232 static inline int same_magic(const char *amagic
, const char *bmagic
,
1235 return strcmp(amagic
, bmagic
) == 0;
1237 #endif /* CONFIG_MODVERSIONS */
1239 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1240 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1241 const struct load_info
*info
,
1245 struct module
*owner
;
1246 const struct kernel_symbol
*sym
;
1247 const unsigned long *crc
;
1250 mutex_lock(&module_mutex
);
1251 sym
= find_symbol(name
, &owner
, &crc
,
1252 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1256 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1258 sym
= ERR_PTR(-EINVAL
);
1262 err
= ref_module(mod
, owner
);
1269 /* We must make copy under the lock if we failed to get ref. */
1270 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1272 mutex_unlock(&module_mutex
);
1276 static const struct kernel_symbol
*
1277 resolve_symbol_wait(struct module
*mod
,
1278 const struct load_info
*info
,
1281 const struct kernel_symbol
*ksym
;
1282 char owner
[MODULE_NAME_LEN
];
1284 if (wait_event_interruptible_timeout(module_wq
,
1285 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1286 || PTR_ERR(ksym
) != -EBUSY
,
1288 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1295 * /sys/module/foo/sections stuff
1296 * J. Corbet <corbet@lwn.net>
1300 #ifdef CONFIG_KALLSYMS
1301 static inline bool sect_empty(const Elf_Shdr
*sect
)
1303 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1306 struct module_sect_attr
1308 struct module_attribute mattr
;
1310 unsigned long address
;
1313 struct module_sect_attrs
1315 struct attribute_group grp
;
1316 unsigned int nsections
;
1317 struct module_sect_attr attrs
[0];
1320 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1321 struct module_kobject
*mk
, char *buf
)
1323 struct module_sect_attr
*sattr
=
1324 container_of(mattr
, struct module_sect_attr
, mattr
);
1325 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1328 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1330 unsigned int section
;
1332 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1333 kfree(sect_attrs
->attrs
[section
].name
);
1337 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1339 unsigned int nloaded
= 0, i
, size
[2];
1340 struct module_sect_attrs
*sect_attrs
;
1341 struct module_sect_attr
*sattr
;
1342 struct attribute
**gattr
;
1344 /* Count loaded sections and allocate structures */
1345 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1346 if (!sect_empty(&info
->sechdrs
[i
]))
1348 size
[0] = ALIGN(sizeof(*sect_attrs
)
1349 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1350 sizeof(sect_attrs
->grp
.attrs
[0]));
1351 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1352 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1353 if (sect_attrs
== NULL
)
1356 /* Setup section attributes. */
1357 sect_attrs
->grp
.name
= "sections";
1358 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1360 sect_attrs
->nsections
= 0;
1361 sattr
= §_attrs
->attrs
[0];
1362 gattr
= §_attrs
->grp
.attrs
[0];
1363 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1364 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1365 if (sect_empty(sec
))
1367 sattr
->address
= sec
->sh_addr
;
1368 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1370 if (sattr
->name
== NULL
)
1372 sect_attrs
->nsections
++;
1373 sysfs_attr_init(&sattr
->mattr
.attr
);
1374 sattr
->mattr
.show
= module_sect_show
;
1375 sattr
->mattr
.store
= NULL
;
1376 sattr
->mattr
.attr
.name
= sattr
->name
;
1377 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1378 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1382 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1385 mod
->sect_attrs
= sect_attrs
;
1388 free_sect_attrs(sect_attrs
);
1391 static void remove_sect_attrs(struct module
*mod
)
1393 if (mod
->sect_attrs
) {
1394 sysfs_remove_group(&mod
->mkobj
.kobj
,
1395 &mod
->sect_attrs
->grp
);
1396 /* We are positive that no one is using any sect attrs
1397 * at this point. Deallocate immediately. */
1398 free_sect_attrs(mod
->sect_attrs
);
1399 mod
->sect_attrs
= NULL
;
1404 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1407 struct module_notes_attrs
{
1408 struct kobject
*dir
;
1410 struct bin_attribute attrs
[0];
1413 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1414 struct bin_attribute
*bin_attr
,
1415 char *buf
, loff_t pos
, size_t count
)
1418 * The caller checked the pos and count against our size.
1420 memcpy(buf
, bin_attr
->private + pos
, count
);
1424 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1427 if (notes_attrs
->dir
) {
1429 sysfs_remove_bin_file(notes_attrs
->dir
,
1430 ¬es_attrs
->attrs
[i
]);
1431 kobject_put(notes_attrs
->dir
);
1436 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1438 unsigned int notes
, loaded
, i
;
1439 struct module_notes_attrs
*notes_attrs
;
1440 struct bin_attribute
*nattr
;
1442 /* failed to create section attributes, so can't create notes */
1443 if (!mod
->sect_attrs
)
1446 /* Count notes sections and allocate structures. */
1448 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1449 if (!sect_empty(&info
->sechdrs
[i
]) &&
1450 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1456 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1457 + notes
* sizeof(notes_attrs
->attrs
[0]),
1459 if (notes_attrs
== NULL
)
1462 notes_attrs
->notes
= notes
;
1463 nattr
= ¬es_attrs
->attrs
[0];
1464 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1465 if (sect_empty(&info
->sechdrs
[i
]))
1467 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1468 sysfs_bin_attr_init(nattr
);
1469 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1470 nattr
->attr
.mode
= S_IRUGO
;
1471 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1472 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1473 nattr
->read
= module_notes_read
;
1479 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1480 if (!notes_attrs
->dir
)
1483 for (i
= 0; i
< notes
; ++i
)
1484 if (sysfs_create_bin_file(notes_attrs
->dir
,
1485 ¬es_attrs
->attrs
[i
]))
1488 mod
->notes_attrs
= notes_attrs
;
1492 free_notes_attrs(notes_attrs
, i
);
1495 static void remove_notes_attrs(struct module
*mod
)
1497 if (mod
->notes_attrs
)
1498 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1503 static inline void add_sect_attrs(struct module
*mod
,
1504 const struct load_info
*info
)
1508 static inline void remove_sect_attrs(struct module
*mod
)
1512 static inline void add_notes_attrs(struct module
*mod
,
1513 const struct load_info
*info
)
1517 static inline void remove_notes_attrs(struct module
*mod
)
1520 #endif /* CONFIG_KALLSYMS */
1522 static void add_usage_links(struct module
*mod
)
1524 #ifdef CONFIG_MODULE_UNLOAD
1525 struct module_use
*use
;
1528 mutex_lock(&module_mutex
);
1529 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1530 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1531 &mod
->mkobj
.kobj
, mod
->name
);
1533 mutex_unlock(&module_mutex
);
1537 static void del_usage_links(struct module
*mod
)
1539 #ifdef CONFIG_MODULE_UNLOAD
1540 struct module_use
*use
;
1542 mutex_lock(&module_mutex
);
1543 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1544 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1545 mutex_unlock(&module_mutex
);
1549 static int module_add_modinfo_attrs(struct module
*mod
)
1551 struct module_attribute
*attr
;
1552 struct module_attribute
*temp_attr
;
1556 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1557 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1559 if (!mod
->modinfo_attrs
)
1562 temp_attr
= mod
->modinfo_attrs
;
1563 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1565 (attr
->test
&& attr
->test(mod
))) {
1566 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1567 sysfs_attr_init(&temp_attr
->attr
);
1568 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1575 static void module_remove_modinfo_attrs(struct module
*mod
)
1577 struct module_attribute
*attr
;
1580 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1581 /* pick a field to test for end of list */
1582 if (!attr
->attr
.name
)
1584 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1588 kfree(mod
->modinfo_attrs
);
1591 static int mod_sysfs_init(struct module
*mod
)
1594 struct kobject
*kobj
;
1596 if (!module_sysfs_initialized
) {
1597 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1603 kobj
= kset_find_obj(module_kset
, mod
->name
);
1605 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1611 mod
->mkobj
.mod
= mod
;
1613 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1614 mod
->mkobj
.kobj
.kset
= module_kset
;
1615 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1618 kobject_put(&mod
->mkobj
.kobj
);
1620 /* delay uevent until full sysfs population */
1625 static int mod_sysfs_setup(struct module
*mod
,
1626 const struct load_info
*info
,
1627 struct kernel_param
*kparam
,
1628 unsigned int num_params
)
1632 err
= mod_sysfs_init(mod
);
1636 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1637 if (!mod
->holders_dir
) {
1642 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1644 goto out_unreg_holders
;
1646 err
= module_add_modinfo_attrs(mod
);
1648 goto out_unreg_param
;
1650 add_usage_links(mod
);
1651 add_sect_attrs(mod
, info
);
1652 add_notes_attrs(mod
, info
);
1654 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1658 module_param_sysfs_remove(mod
);
1660 kobject_put(mod
->holders_dir
);
1662 kobject_put(&mod
->mkobj
.kobj
);
1667 static void mod_sysfs_fini(struct module
*mod
)
1669 remove_notes_attrs(mod
);
1670 remove_sect_attrs(mod
);
1671 kobject_put(&mod
->mkobj
.kobj
);
1674 #else /* !CONFIG_SYSFS */
1676 static int mod_sysfs_setup(struct module
*mod
,
1677 const struct load_info
*info
,
1678 struct kernel_param
*kparam
,
1679 unsigned int num_params
)
1684 static void mod_sysfs_fini(struct module
*mod
)
1688 static void module_remove_modinfo_attrs(struct module
*mod
)
1692 static void del_usage_links(struct module
*mod
)
1696 #endif /* CONFIG_SYSFS */
1698 static void mod_sysfs_teardown(struct module
*mod
)
1700 del_usage_links(mod
);
1701 module_remove_modinfo_attrs(mod
);
1702 module_param_sysfs_remove(mod
);
1703 kobject_put(mod
->mkobj
.drivers_dir
);
1704 kobject_put(mod
->holders_dir
);
1705 mod_sysfs_fini(mod
);
1709 * unlink the module with the whole machine is stopped with interrupts off
1710 * - this defends against kallsyms not taking locks
1712 static int __unlink_module(void *_mod
)
1714 struct module
*mod
= _mod
;
1715 list_del(&mod
->list
);
1716 module_bug_cleanup(mod
);
1720 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1722 * LKM RO/NX protection: protect module's text/ro-data
1723 * from modification and any data from execution.
1725 void set_page_attributes(void *start
, void *end
, int (*set
)(unsigned long start
, int num_pages
))
1727 unsigned long begin_pfn
= PFN_DOWN((unsigned long)start
);
1728 unsigned long end_pfn
= PFN_DOWN((unsigned long)end
);
1730 if (end_pfn
> begin_pfn
)
1731 set(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1734 static void set_section_ro_nx(void *base
,
1735 unsigned long text_size
,
1736 unsigned long ro_size
,
1737 unsigned long total_size
)
1739 /* begin and end PFNs of the current subsection */
1740 unsigned long begin_pfn
;
1741 unsigned long end_pfn
;
1744 * Set RO for module text and RO-data:
1745 * - Always protect first page.
1746 * - Do not protect last partial page.
1749 set_page_attributes(base
, base
+ ro_size
, set_memory_ro
);
1752 * Set NX permissions for module data:
1753 * - Do not protect first partial page.
1754 * - Always protect last page.
1756 if (total_size
> text_size
) {
1757 begin_pfn
= PFN_UP((unsigned long)base
+ text_size
);
1758 end_pfn
= PFN_UP((unsigned long)base
+ total_size
);
1759 if (end_pfn
> begin_pfn
)
1760 set_memory_nx(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1764 static void unset_module_core_ro_nx(struct module
*mod
)
1766 set_page_attributes(mod
->module_core
+ mod
->core_text_size
,
1767 mod
->module_core
+ mod
->core_size
,
1769 set_page_attributes(mod
->module_core
,
1770 mod
->module_core
+ mod
->core_ro_size
,
1774 static void unset_module_init_ro_nx(struct module
*mod
)
1776 set_page_attributes(mod
->module_init
+ mod
->init_text_size
,
1777 mod
->module_init
+ mod
->init_size
,
1779 set_page_attributes(mod
->module_init
,
1780 mod
->module_init
+ mod
->init_ro_size
,
1784 /* Iterate through all modules and set each module's text as RW */
1785 void set_all_modules_text_rw(void)
1789 mutex_lock(&module_mutex
);
1790 list_for_each_entry_rcu(mod
, &modules
, list
) {
1791 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1792 set_page_attributes(mod
->module_core
,
1793 mod
->module_core
+ mod
->core_text_size
,
1796 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1797 set_page_attributes(mod
->module_init
,
1798 mod
->module_init
+ mod
->init_text_size
,
1802 mutex_unlock(&module_mutex
);
1805 /* Iterate through all modules and set each module's text as RO */
1806 void set_all_modules_text_ro(void)
1810 mutex_lock(&module_mutex
);
1811 list_for_each_entry_rcu(mod
, &modules
, list
) {
1812 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1813 set_page_attributes(mod
->module_core
,
1814 mod
->module_core
+ mod
->core_text_size
,
1817 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1818 set_page_attributes(mod
->module_init
,
1819 mod
->module_init
+ mod
->init_text_size
,
1823 mutex_unlock(&module_mutex
);
1826 static inline void set_section_ro_nx(void *base
, unsigned long text_size
, unsigned long ro_size
, unsigned long total_size
) { }
1827 static void unset_module_core_ro_nx(struct module
*mod
) { }
1828 static void unset_module_init_ro_nx(struct module
*mod
) { }
1831 void __weak
module_free(struct module
*mod
, void *module_region
)
1833 vfree(module_region
);
1836 void __weak
module_arch_cleanup(struct module
*mod
)
1840 /* Free a module, remove from lists, etc. */
1841 static void free_module(struct module
*mod
)
1843 trace_module_free(mod
);
1845 /* Delete from various lists */
1846 mutex_lock(&module_mutex
);
1847 stop_machine(__unlink_module
, mod
, NULL
);
1848 mutex_unlock(&module_mutex
);
1849 mod_sysfs_teardown(mod
);
1851 /* Remove dynamic debug info */
1852 ddebug_remove_module(mod
->name
);
1854 /* Arch-specific cleanup. */
1855 module_arch_cleanup(mod
);
1857 /* Module unload stuff */
1858 module_unload_free(mod
);
1860 /* Free any allocated parameters. */
1861 destroy_params(mod
->kp
, mod
->num_kp
);
1863 /* This may be NULL, but that's OK */
1864 unset_module_init_ro_nx(mod
);
1865 module_free(mod
, mod
->module_init
);
1867 percpu_modfree(mod
);
1869 /* Free lock-classes: */
1870 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1872 /* Finally, free the core (containing the module structure) */
1873 unset_module_core_ro_nx(mod
);
1874 module_free(mod
, mod
->module_core
);
1877 update_protections(current
->mm
);
1881 void *__symbol_get(const char *symbol
)
1883 struct module
*owner
;
1884 const struct kernel_symbol
*sym
;
1887 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1888 if (sym
&& strong_try_module_get(owner
))
1892 return sym
? (void *)sym
->value
: NULL
;
1894 EXPORT_SYMBOL_GPL(__symbol_get
);
1897 * Ensure that an exported symbol [global namespace] does not already exist
1898 * in the kernel or in some other module's exported symbol table.
1900 * You must hold the module_mutex.
1902 static int verify_export_symbols(struct module
*mod
)
1905 struct module
*owner
;
1906 const struct kernel_symbol
*s
;
1908 const struct kernel_symbol
*sym
;
1911 { mod
->syms
, mod
->num_syms
},
1912 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1913 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1914 #ifdef CONFIG_UNUSED_SYMBOLS
1915 { mod
->unused_syms
, mod
->num_unused_syms
},
1916 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1920 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1921 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1922 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1924 "%s: exports duplicate symbol %s"
1926 mod
->name
, s
->name
, module_name(owner
));
1934 /* Change all symbols so that st_value encodes the pointer directly. */
1935 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
1937 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
1938 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
1939 unsigned long secbase
;
1942 const struct kernel_symbol
*ksym
;
1944 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
1945 const char *name
= info
->strtab
+ sym
[i
].st_name
;
1947 switch (sym
[i
].st_shndx
) {
1949 /* We compiled with -fno-common. These are not
1950 supposed to happen. */
1951 pr_debug("Common symbol: %s\n", name
);
1952 printk("%s: please compile with -fno-common\n",
1958 /* Don't need to do anything */
1959 pr_debug("Absolute symbol: 0x%08lx\n",
1960 (long)sym
[i
].st_value
);
1964 ksym
= resolve_symbol_wait(mod
, info
, name
);
1965 /* Ok if resolved. */
1966 if (ksym
&& !IS_ERR(ksym
)) {
1967 sym
[i
].st_value
= ksym
->value
;
1972 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1975 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
1976 mod
->name
, name
, PTR_ERR(ksym
));
1977 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
1981 /* Divert to percpu allocation if a percpu var. */
1982 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
1983 secbase
= (unsigned long)mod_percpu(mod
);
1985 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1986 sym
[i
].st_value
+= secbase
;
1994 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
1999 /* Now do relocations. */
2000 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2001 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2003 /* Not a valid relocation section? */
2004 if (infosec
>= info
->hdr
->e_shnum
)
2007 /* Don't bother with non-allocated sections */
2008 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2011 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2012 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2013 info
->index
.sym
, i
, mod
);
2014 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2015 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2016 info
->index
.sym
, i
, mod
);
2023 /* Additional bytes needed by arch in front of individual sections */
2024 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2025 unsigned int section
)
2027 /* default implementation just returns zero */
2031 /* Update size with this section: return offset. */
2032 static long get_offset(struct module
*mod
, unsigned int *size
,
2033 Elf_Shdr
*sechdr
, unsigned int section
)
2037 *size
+= arch_mod_section_prepend(mod
, section
);
2038 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2039 *size
= ret
+ sechdr
->sh_size
;
2043 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2044 might -- code, read-only data, read-write data, small data. Tally
2045 sizes, and place the offsets into sh_entsize fields: high bit means it
2047 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2049 static unsigned long const masks
[][2] = {
2050 /* NOTE: all executable code must be the first section
2051 * in this array; otherwise modify the text_size
2052 * finder in the two loops below */
2053 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2054 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2055 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2056 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2060 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2061 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2063 pr_debug("Core section allocation order:\n");
2064 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2065 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2066 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2067 const char *sname
= info
->secstrings
+ s
->sh_name
;
2069 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2070 || (s
->sh_flags
& masks
[m
][1])
2071 || s
->sh_entsize
!= ~0UL
2072 || strstarts(sname
, ".init"))
2074 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
2075 pr_debug("\t%s\n", sname
);
2078 case 0: /* executable */
2079 mod
->core_size
= debug_align(mod
->core_size
);
2080 mod
->core_text_size
= mod
->core_size
;
2082 case 1: /* RO: text and ro-data */
2083 mod
->core_size
= debug_align(mod
->core_size
);
2084 mod
->core_ro_size
= mod
->core_size
;
2086 case 3: /* whole core */
2087 mod
->core_size
= debug_align(mod
->core_size
);
2092 pr_debug("Init section allocation order:\n");
2093 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2094 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2095 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2096 const char *sname
= info
->secstrings
+ s
->sh_name
;
2098 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2099 || (s
->sh_flags
& masks
[m
][1])
2100 || s
->sh_entsize
!= ~0UL
2101 || !strstarts(sname
, ".init"))
2103 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
2104 | INIT_OFFSET_MASK
);
2105 pr_debug("\t%s\n", sname
);
2108 case 0: /* executable */
2109 mod
->init_size
= debug_align(mod
->init_size
);
2110 mod
->init_text_size
= mod
->init_size
;
2112 case 1: /* RO: text and ro-data */
2113 mod
->init_size
= debug_align(mod
->init_size
);
2114 mod
->init_ro_size
= mod
->init_size
;
2116 case 3: /* whole init */
2117 mod
->init_size
= debug_align(mod
->init_size
);
2123 static void set_license(struct module
*mod
, const char *license
)
2126 license
= "unspecified";
2128 if (!license_is_gpl_compatible(license
)) {
2129 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2130 printk(KERN_WARNING
"%s: module license '%s' taints "
2131 "kernel.\n", mod
->name
, license
);
2132 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2136 /* Parse tag=value strings from .modinfo section */
2137 static char *next_string(char *string
, unsigned long *secsize
)
2139 /* Skip non-zero chars */
2142 if ((*secsize
)-- <= 1)
2146 /* Skip any zero padding. */
2147 while (!string
[0]) {
2149 if ((*secsize
)-- <= 1)
2155 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2158 unsigned int taglen
= strlen(tag
);
2159 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2160 unsigned long size
= infosec
->sh_size
;
2162 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2163 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2164 return p
+ taglen
+ 1;
2169 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2171 struct module_attribute
*attr
;
2174 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2176 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2180 static void free_modinfo(struct module
*mod
)
2182 struct module_attribute
*attr
;
2185 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2191 #ifdef CONFIG_KALLSYMS
2193 /* lookup symbol in given range of kernel_symbols */
2194 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2195 const struct kernel_symbol
*start
,
2196 const struct kernel_symbol
*stop
)
2198 return bsearch(name
, start
, stop
- start
,
2199 sizeof(struct kernel_symbol
), cmp_name
);
2202 static int is_exported(const char *name
, unsigned long value
,
2203 const struct module
*mod
)
2205 const struct kernel_symbol
*ks
;
2207 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2209 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2210 return ks
!= NULL
&& ks
->value
== value
;
2214 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2216 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2218 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2219 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2224 if (sym
->st_shndx
== SHN_UNDEF
)
2226 if (sym
->st_shndx
== SHN_ABS
)
2228 if (sym
->st_shndx
>= SHN_LORESERVE
)
2230 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2232 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2233 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2234 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2236 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2241 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2242 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2247 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2254 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2257 const Elf_Shdr
*sec
;
2259 if (src
->st_shndx
== SHN_UNDEF
2260 || src
->st_shndx
>= shnum
2264 sec
= sechdrs
+ src
->st_shndx
;
2265 if (!(sec
->sh_flags
& SHF_ALLOC
)
2266 #ifndef CONFIG_KALLSYMS_ALL
2267 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2269 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2276 * We only allocate and copy the strings needed by the parts of symtab
2277 * we keep. This is simple, but has the effect of making multiple
2278 * copies of duplicates. We could be more sophisticated, see
2279 * linux-kernel thread starting with
2280 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2282 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2284 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2285 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2287 unsigned int i
, nsrc
, ndst
, strtab_size
;
2289 /* Put symbol section at end of init part of module. */
2290 symsect
->sh_flags
|= SHF_ALLOC
;
2291 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
2292 info
->index
.sym
) | INIT_OFFSET_MASK
;
2293 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2295 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2296 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2298 /* strtab always starts with a nul, so offset 0 is the empty string. */
2301 /* Compute total space required for the core symbols' strtab. */
2302 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2304 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2305 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2310 /* Append room for core symbols at end of core part. */
2311 info
->symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
2312 info
->stroffs
= mod
->core_size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2313 mod
->core_size
+= strtab_size
;
2315 /* Put string table section at end of init part of module. */
2316 strsect
->sh_flags
|= SHF_ALLOC
;
2317 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
2318 info
->index
.str
) | INIT_OFFSET_MASK
;
2319 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2322 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2324 unsigned int i
, ndst
;
2328 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2330 mod
->symtab
= (void *)symsec
->sh_addr
;
2331 mod
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2332 /* Make sure we get permanent strtab: don't use info->strtab. */
2333 mod
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2335 /* Set types up while we still have access to sections. */
2336 for (i
= 0; i
< mod
->num_symtab
; i
++)
2337 mod
->symtab
[i
].st_info
= elf_type(&mod
->symtab
[i
], info
);
2339 mod
->core_symtab
= dst
= mod
->module_core
+ info
->symoffs
;
2340 mod
->core_strtab
= s
= mod
->module_core
+ info
->stroffs
;
2343 for (ndst
= i
= 0; i
< mod
->num_symtab
; i
++) {
2345 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2347 dst
[ndst
++].st_name
= s
- mod
->core_strtab
;
2348 s
+= strlcpy(s
, &mod
->strtab
[src
[i
].st_name
],
2352 mod
->core_num_syms
= ndst
;
2355 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2359 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2362 #endif /* CONFIG_KALLSYMS */
2364 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2368 #ifdef CONFIG_DYNAMIC_DEBUG
2369 if (ddebug_add_module(debug
, num
, debug
->modname
))
2370 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2375 static void dynamic_debug_remove(struct _ddebug
*debug
)
2378 ddebug_remove_module(debug
->modname
);
2381 void * __weak
module_alloc(unsigned long size
)
2383 return size
== 0 ? NULL
: vmalloc_exec(size
);
2386 static void *module_alloc_update_bounds(unsigned long size
)
2388 void *ret
= module_alloc(size
);
2391 mutex_lock(&module_mutex
);
2392 /* Update module bounds. */
2393 if ((unsigned long)ret
< module_addr_min
)
2394 module_addr_min
= (unsigned long)ret
;
2395 if ((unsigned long)ret
+ size
> module_addr_max
)
2396 module_addr_max
= (unsigned long)ret
+ size
;
2397 mutex_unlock(&module_mutex
);
2402 #ifdef CONFIG_DEBUG_KMEMLEAK
2403 static void kmemleak_load_module(const struct module
*mod
,
2404 const struct load_info
*info
)
2408 /* only scan the sections containing data */
2409 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2411 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2412 const char *name
= info
->secstrings
+ info
->sechdrs
[i
].sh_name
;
2413 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2415 if (!strstarts(name
, ".data") && !strstarts(name
, ".bss"))
2418 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2419 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2423 static inline void kmemleak_load_module(const struct module
*mod
,
2424 const struct load_info
*info
)
2429 #ifdef CONFIG_MODULE_SIG
2430 static int module_sig_check(struct load_info
*info
)
2433 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2434 const void *mod
= info
->hdr
;
2436 if (info
->len
> markerlen
&&
2437 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2438 /* We truncate the module to discard the signature */
2439 info
->len
-= markerlen
;
2440 err
= mod_verify_sig(mod
, &info
->len
);
2444 info
->sig_ok
= true;
2448 /* Not having a signature is only an error if we're strict. */
2449 if (err
< 0 && fips_enabled
)
2450 panic("Module verification failed with error %d in FIPS mode\n",
2452 if (err
== -ENOKEY
&& !sig_enforce
)
2457 #else /* !CONFIG_MODULE_SIG */
2458 static int module_sig_check(struct load_info
*info
)
2462 #endif /* !CONFIG_MODULE_SIG */
2464 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2465 static int elf_header_check(struct load_info
*info
)
2467 if (info
->len
< sizeof(*(info
->hdr
)))
2470 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2471 || info
->hdr
->e_type
!= ET_REL
2472 || !elf_check_arch(info
->hdr
)
2473 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2476 if (info
->hdr
->e_shoff
>= info
->len
2477 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2478 info
->len
- info
->hdr
->e_shoff
))
2484 /* Sets info->hdr and info->len. */
2485 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2486 struct load_info
*info
)
2489 if (info
->len
< sizeof(*(info
->hdr
)))
2492 /* Suck in entire file: we'll want most of it. */
2493 info
->hdr
= vmalloc(info
->len
);
2497 if (copy_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2505 /* Sets info->hdr and info->len. */
2506 static int copy_module_from_fd(int fd
, struct load_info
*info
)
2518 err
= vfs_getattr(file
->f_vfsmnt
, file
->f_dentry
, &stat
);
2522 if (stat
.size
> INT_MAX
) {
2526 info
->hdr
= vmalloc(stat
.size
);
2533 while (pos
< stat
.size
) {
2534 bytes
= kernel_read(file
, pos
, (char *)(info
->hdr
) + pos
,
2552 static void free_copy(struct load_info
*info
)
2557 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2561 /* This should always be true, but let's be sure. */
2562 info
->sechdrs
[0].sh_addr
= 0;
2564 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2565 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2566 if (shdr
->sh_type
!= SHT_NOBITS
2567 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2568 printk(KERN_ERR
"Module len %lu truncated\n",
2573 /* Mark all sections sh_addr with their address in the
2575 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2577 #ifndef CONFIG_MODULE_UNLOAD
2578 /* Don't load .exit sections */
2579 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2580 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2584 /* Track but don't keep modinfo and version sections. */
2585 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2586 info
->index
.vers
= 0; /* Pretend no __versions section! */
2588 info
->index
.vers
= find_sec(info
, "__versions");
2589 info
->index
.info
= find_sec(info
, ".modinfo");
2590 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2591 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2596 * Set up our basic convenience variables (pointers to section headers,
2597 * search for module section index etc), and do some basic section
2600 * Return the temporary module pointer (we'll replace it with the final
2601 * one when we move the module sections around).
2603 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2609 /* Set up the convenience variables */
2610 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2611 info
->secstrings
= (void *)info
->hdr
2612 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2614 err
= rewrite_section_headers(info
, flags
);
2616 return ERR_PTR(err
);
2618 /* Find internal symbols and strings. */
2619 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2620 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2621 info
->index
.sym
= i
;
2622 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2623 info
->strtab
= (char *)info
->hdr
2624 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2629 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2630 if (!info
->index
.mod
) {
2631 printk(KERN_WARNING
"No module found in object\n");
2632 return ERR_PTR(-ENOEXEC
);
2634 /* This is temporary: point mod into copy of data. */
2635 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2637 if (info
->index
.sym
== 0) {
2638 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2640 return ERR_PTR(-ENOEXEC
);
2643 info
->index
.pcpu
= find_pcpusec(info
);
2645 /* Check module struct version now, before we try to use module. */
2646 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2647 return ERR_PTR(-ENOEXEC
);
2652 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2654 const char *modmagic
= get_modinfo(info
, "vermagic");
2657 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2660 /* This is allowed: modprobe --force will invalidate it. */
2662 err
= try_to_force_load(mod
, "bad vermagic");
2665 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2666 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2667 mod
->name
, modmagic
, vermagic
);
2671 if (!get_modinfo(info
, "intree"))
2672 add_taint_module(mod
, TAINT_OOT_MODULE
);
2674 if (get_modinfo(info
, "staging")) {
2675 add_taint_module(mod
, TAINT_CRAP
);
2676 printk(KERN_WARNING
"%s: module is from the staging directory,"
2677 " the quality is unknown, you have been warned.\n",
2681 /* Set up license info based on the info section */
2682 set_license(mod
, get_modinfo(info
, "license"));
2687 static void find_module_sections(struct module
*mod
, struct load_info
*info
)
2689 mod
->kp
= section_objs(info
, "__param",
2690 sizeof(*mod
->kp
), &mod
->num_kp
);
2691 mod
->syms
= section_objs(info
, "__ksymtab",
2692 sizeof(*mod
->syms
), &mod
->num_syms
);
2693 mod
->crcs
= section_addr(info
, "__kcrctab");
2694 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2695 sizeof(*mod
->gpl_syms
),
2696 &mod
->num_gpl_syms
);
2697 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2698 mod
->gpl_future_syms
= section_objs(info
,
2699 "__ksymtab_gpl_future",
2700 sizeof(*mod
->gpl_future_syms
),
2701 &mod
->num_gpl_future_syms
);
2702 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2704 #ifdef CONFIG_UNUSED_SYMBOLS
2705 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2706 sizeof(*mod
->unused_syms
),
2707 &mod
->num_unused_syms
);
2708 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2709 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2710 sizeof(*mod
->unused_gpl_syms
),
2711 &mod
->num_unused_gpl_syms
);
2712 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2714 #ifdef CONFIG_CONSTRUCTORS
2715 mod
->ctors
= section_objs(info
, ".ctors",
2716 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2719 #ifdef CONFIG_TRACEPOINTS
2720 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2721 sizeof(*mod
->tracepoints_ptrs
),
2722 &mod
->num_tracepoints
);
2724 #ifdef HAVE_JUMP_LABEL
2725 mod
->jump_entries
= section_objs(info
, "__jump_table",
2726 sizeof(*mod
->jump_entries
),
2727 &mod
->num_jump_entries
);
2729 #ifdef CONFIG_EVENT_TRACING
2730 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2731 sizeof(*mod
->trace_events
),
2732 &mod
->num_trace_events
);
2734 * This section contains pointers to allocated objects in the trace
2735 * code and not scanning it leads to false positives.
2737 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2738 mod
->num_trace_events
, GFP_KERNEL
);
2740 #ifdef CONFIG_TRACING
2741 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2742 sizeof(*mod
->trace_bprintk_fmt_start
),
2743 &mod
->num_trace_bprintk_fmt
);
2745 * This section contains pointers to allocated objects in the trace
2746 * code and not scanning it leads to false positives.
2748 kmemleak_scan_area(mod
->trace_bprintk_fmt_start
,
2749 sizeof(*mod
->trace_bprintk_fmt_start
) *
2750 mod
->num_trace_bprintk_fmt
, GFP_KERNEL
);
2752 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2753 /* sechdrs[0].sh_size is always zero */
2754 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2755 sizeof(*mod
->ftrace_callsites
),
2756 &mod
->num_ftrace_callsites
);
2759 mod
->extable
= section_objs(info
, "__ex_table",
2760 sizeof(*mod
->extable
), &mod
->num_exentries
);
2762 if (section_addr(info
, "__obsparm"))
2763 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2766 info
->debug
= section_objs(info
, "__verbose",
2767 sizeof(*info
->debug
), &info
->num_debug
);
2770 static int move_module(struct module
*mod
, struct load_info
*info
)
2775 /* Do the allocs. */
2776 ptr
= module_alloc_update_bounds(mod
->core_size
);
2778 * The pointer to this block is stored in the module structure
2779 * which is inside the block. Just mark it as not being a
2782 kmemleak_not_leak(ptr
);
2786 memset(ptr
, 0, mod
->core_size
);
2787 mod
->module_core
= ptr
;
2789 ptr
= module_alloc_update_bounds(mod
->init_size
);
2791 * The pointer to this block is stored in the module structure
2792 * which is inside the block. This block doesn't need to be
2793 * scanned as it contains data and code that will be freed
2794 * after the module is initialized.
2796 kmemleak_ignore(ptr
);
2797 if (!ptr
&& mod
->init_size
) {
2798 module_free(mod
, mod
->module_core
);
2801 memset(ptr
, 0, mod
->init_size
);
2802 mod
->module_init
= ptr
;
2804 /* Transfer each section which specifies SHF_ALLOC */
2805 pr_debug("final section addresses:\n");
2806 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
2808 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2810 if (!(shdr
->sh_flags
& SHF_ALLOC
))
2813 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
2814 dest
= mod
->module_init
2815 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
2817 dest
= mod
->module_core
+ shdr
->sh_entsize
;
2819 if (shdr
->sh_type
!= SHT_NOBITS
)
2820 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
2821 /* Update sh_addr to point to copy in image. */
2822 shdr
->sh_addr
= (unsigned long)dest
;
2823 pr_debug("\t0x%lx %s\n",
2824 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
2830 static int check_module_license_and_versions(struct module
*mod
)
2833 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2834 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2835 * using GPL-only symbols it needs.
2837 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2838 add_taint(TAINT_PROPRIETARY_MODULE
);
2840 /* driverloader was caught wrongly pretending to be under GPL */
2841 if (strcmp(mod
->name
, "driverloader") == 0)
2842 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2844 /* lve claims to be GPL but upstream won't provide source */
2845 if (strcmp(mod
->name
, "lve") == 0)
2846 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2848 #ifdef CONFIG_MODVERSIONS
2849 if ((mod
->num_syms
&& !mod
->crcs
)
2850 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2851 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2852 #ifdef CONFIG_UNUSED_SYMBOLS
2853 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2854 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2857 return try_to_force_load(mod
,
2858 "no versions for exported symbols");
2864 static void flush_module_icache(const struct module
*mod
)
2866 mm_segment_t old_fs
;
2868 /* flush the icache in correct context */
2873 * Flush the instruction cache, since we've played with text.
2874 * Do it before processing of module parameters, so the module
2875 * can provide parameter accessor functions of its own.
2877 if (mod
->module_init
)
2878 flush_icache_range((unsigned long)mod
->module_init
,
2879 (unsigned long)mod
->module_init
2881 flush_icache_range((unsigned long)mod
->module_core
,
2882 (unsigned long)mod
->module_core
+ mod
->core_size
);
2887 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
2895 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
2897 /* Module within temporary copy. */
2902 mod
= setup_load_info(info
, flags
);
2906 err
= check_modinfo(mod
, info
, flags
);
2908 return ERR_PTR(err
);
2910 /* Allow arches to frob section contents and sizes. */
2911 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
2912 info
->secstrings
, mod
);
2916 pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
2917 if (pcpusec
->sh_size
) {
2918 /* We have a special allocation for this section. */
2919 err
= percpu_modalloc(mod
,
2920 pcpusec
->sh_size
, pcpusec
->sh_addralign
);
2923 pcpusec
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2926 /* Determine total sizes, and put offsets in sh_entsize. For now
2927 this is done generically; there doesn't appear to be any
2928 special cases for the architectures. */
2929 layout_sections(mod
, info
);
2930 layout_symtab(mod
, info
);
2932 /* Allocate and move to the final place */
2933 err
= move_module(mod
, info
);
2937 /* Module has been copied to its final place now: return it. */
2938 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2939 kmemleak_load_module(mod
, info
);
2943 percpu_modfree(mod
);
2945 return ERR_PTR(err
);
2948 /* mod is no longer valid after this! */
2949 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
2951 percpu_modfree(mod
);
2952 module_free(mod
, mod
->module_init
);
2953 module_free(mod
, mod
->module_core
);
2956 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
2957 const Elf_Shdr
*sechdrs
,
2963 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
2965 /* Sort exception table now relocations are done. */
2966 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2968 /* Copy relocated percpu area over. */
2969 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
2970 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
2972 /* Setup kallsyms-specific fields. */
2973 add_kallsyms(mod
, info
);
2975 /* Arch-specific module finalizing. */
2976 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
2979 /* Is this module of this name done loading? No locks held. */
2980 static bool finished_loading(const char *name
)
2985 mutex_lock(&module_mutex
);
2986 mod
= find_module(name
);
2987 ret
= !mod
|| mod
->state
!= MODULE_STATE_COMING
;
2988 mutex_unlock(&module_mutex
);
2993 /* Call module constructors. */
2994 static void do_mod_ctors(struct module
*mod
)
2996 #ifdef CONFIG_CONSTRUCTORS
2999 for (i
= 0; i
< mod
->num_ctors
; i
++)
3004 /* This is where the real work happens */
3005 static int do_init_module(struct module
*mod
)
3009 blocking_notifier_call_chain(&module_notify_list
,
3010 MODULE_STATE_COMING
, mod
);
3012 /* Set RO and NX regions for core */
3013 set_section_ro_nx(mod
->module_core
,
3014 mod
->core_text_size
,
3018 /* Set RO and NX regions for init */
3019 set_section_ro_nx(mod
->module_init
,
3020 mod
->init_text_size
,
3025 /* Start the module */
3026 if (mod
->init
!= NULL
)
3027 ret
= do_one_initcall(mod
->init
);
3029 /* Init routine failed: abort. Try to protect us from
3030 buggy refcounters. */
3031 mod
->state
= MODULE_STATE_GOING
;
3032 synchronize_sched();
3034 blocking_notifier_call_chain(&module_notify_list
,
3035 MODULE_STATE_GOING
, mod
);
3037 wake_up_all(&module_wq
);
3042 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3043 "%s: loading module anyway...\n",
3044 __func__
, mod
->name
, ret
,
3049 /* Now it's a first class citizen! */
3050 mod
->state
= MODULE_STATE_LIVE
;
3051 blocking_notifier_call_chain(&module_notify_list
,
3052 MODULE_STATE_LIVE
, mod
);
3054 /* We need to finish all async code before the module init sequence is done */
3055 async_synchronize_full();
3057 mutex_lock(&module_mutex
);
3058 /* Drop initial reference. */
3060 trim_init_extable(mod
);
3061 #ifdef CONFIG_KALLSYMS
3062 mod
->num_symtab
= mod
->core_num_syms
;
3063 mod
->symtab
= mod
->core_symtab
;
3064 mod
->strtab
= mod
->core_strtab
;
3066 unset_module_init_ro_nx(mod
);
3067 module_free(mod
, mod
->module_init
);
3068 mod
->module_init
= NULL
;
3070 mod
->init_ro_size
= 0;
3071 mod
->init_text_size
= 0;
3072 mutex_unlock(&module_mutex
);
3073 wake_up_all(&module_wq
);
3078 static int may_init_module(void)
3080 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3086 /* Allocate and load the module: note that size of section 0 is always
3087 zero, and we rely on this for optional sections. */
3088 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3091 struct module
*mod
, *old
;
3094 err
= module_sig_check(info
);
3098 err
= elf_header_check(info
);
3102 /* Figure out module layout, and allocate all the memory. */
3103 mod
= layout_and_allocate(info
, flags
);
3109 #ifdef CONFIG_MODULE_SIG
3110 mod
->sig_ok
= info
->sig_ok
;
3112 add_taint_module(mod
, TAINT_FORCED_MODULE
);
3115 /* Now module is in final location, initialize linked lists, etc. */
3116 err
= module_unload_init(mod
);
3120 /* Now we've got everything in the final locations, we can
3121 * find optional sections. */
3122 find_module_sections(mod
, info
);
3124 err
= check_module_license_and_versions(mod
);
3128 /* Set up MODINFO_ATTR fields */
3129 setup_modinfo(mod
, info
);
3131 /* Fix up syms, so that st_value is a pointer to location. */
3132 err
= simplify_symbols(mod
, info
);
3136 err
= apply_relocations(mod
, info
);
3140 err
= post_relocation(mod
, info
);
3144 flush_module_icache(mod
);
3146 /* Now copy in args */
3147 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3148 if (IS_ERR(mod
->args
)) {
3149 err
= PTR_ERR(mod
->args
);
3150 goto free_arch_cleanup
;
3153 /* Mark state as coming so strong_try_module_get() ignores us. */
3154 mod
->state
= MODULE_STATE_COMING
;
3156 /* Now sew it into the lists so we can get lockdep and oops
3157 * info during argument parsing. No one should access us, since
3158 * strong_try_module_get() will fail.
3159 * lockdep/oops can run asynchronous, so use the RCU list insertion
3160 * function to insert in a way safe to concurrent readers.
3161 * The mutex protects against concurrent writers.
3164 mutex_lock(&module_mutex
);
3165 if ((old
= find_module(mod
->name
)) != NULL
) {
3166 if (old
->state
== MODULE_STATE_COMING
) {
3167 /* Wait in case it fails to load. */
3168 mutex_unlock(&module_mutex
);
3169 err
= wait_event_interruptible(module_wq
,
3170 finished_loading(mod
->name
));
3172 goto free_arch_cleanup
;
3179 /* This has to be done once we're sure module name is unique. */
3180 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3182 /* Find duplicate symbols */
3183 err
= verify_export_symbols(mod
);
3187 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3188 list_add_rcu(&mod
->list
, &modules
);
3189 mutex_unlock(&module_mutex
);
3191 /* Module is ready to execute: parsing args may do that. */
3192 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3193 -32768, 32767, &ddebug_dyndbg_module_param_cb
);
3197 /* Link in to syfs. */
3198 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3202 /* Get rid of temporary copy. */
3206 trace_module_load(mod
);
3208 return do_init_module(mod
);
3211 mutex_lock(&module_mutex
);
3212 /* Unlink carefully: kallsyms could be walking list. */
3213 list_del_rcu(&mod
->list
);
3214 module_bug_cleanup(mod
);
3215 wake_up_all(&module_wq
);
3217 dynamic_debug_remove(info
->debug
);
3219 mutex_unlock(&module_mutex
);
3220 synchronize_sched();
3223 module_arch_cleanup(mod
);
3227 module_unload_free(mod
);
3229 module_deallocate(mod
, info
);
3235 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3236 unsigned long, len
, const char __user
*, uargs
)
3239 struct load_info info
= { };
3241 err
= may_init_module();
3245 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3248 err
= copy_module_from_user(umod
, len
, &info
);
3252 return load_module(&info
, uargs
, 0);
3255 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3258 struct load_info info
= { };
3260 err
= may_init_module();
3264 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3266 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3267 |MODULE_INIT_IGNORE_VERMAGIC
))
3270 err
= copy_module_from_fd(fd
, &info
);
3274 return load_module(&info
, uargs
, flags
);
3277 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3279 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3282 #ifdef CONFIG_KALLSYMS
3284 * This ignores the intensely annoying "mapping symbols" found
3285 * in ARM ELF files: $a, $t and $d.
3287 static inline int is_arm_mapping_symbol(const char *str
)
3289 return str
[0] == '$' && strchr("atd", str
[1])
3290 && (str
[2] == '\0' || str
[2] == '.');
3293 static const char *get_ksymbol(struct module
*mod
,
3295 unsigned long *size
,
3296 unsigned long *offset
)
3298 unsigned int i
, best
= 0;
3299 unsigned long nextval
;
3301 /* At worse, next value is at end of module */
3302 if (within_module_init(addr
, mod
))
3303 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
3305 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
3307 /* Scan for closest preceding symbol, and next symbol. (ELF
3308 starts real symbols at 1). */
3309 for (i
= 1; i
< mod
->num_symtab
; i
++) {
3310 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3313 /* We ignore unnamed symbols: they're uninformative
3314 * and inserted at a whim. */
3315 if (mod
->symtab
[i
].st_value
<= addr
3316 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
3317 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3318 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3320 if (mod
->symtab
[i
].st_value
> addr
3321 && mod
->symtab
[i
].st_value
< nextval
3322 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3323 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3324 nextval
= mod
->symtab
[i
].st_value
;
3331 *size
= nextval
- mod
->symtab
[best
].st_value
;
3333 *offset
= addr
- mod
->symtab
[best
].st_value
;
3334 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
3337 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3338 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3339 const char *module_address_lookup(unsigned long addr
,
3340 unsigned long *size
,
3341 unsigned long *offset
,
3346 const char *ret
= NULL
;
3349 list_for_each_entry_rcu(mod
, &modules
, list
) {
3350 if (within_module_init(addr
, mod
) ||
3351 within_module_core(addr
, mod
)) {
3353 *modname
= mod
->name
;
3354 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3358 /* Make a copy in here where it's safe */
3360 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3367 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3372 list_for_each_entry_rcu(mod
, &modules
, list
) {
3373 if (within_module_init(addr
, mod
) ||
3374 within_module_core(addr
, mod
)) {
3377 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3380 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3390 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3391 unsigned long *offset
, char *modname
, char *name
)
3396 list_for_each_entry_rcu(mod
, &modules
, list
) {
3397 if (within_module_init(addr
, mod
) ||
3398 within_module_core(addr
, mod
)) {
3401 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3405 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3407 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3417 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3418 char *name
, char *module_name
, int *exported
)
3423 list_for_each_entry_rcu(mod
, &modules
, list
) {
3424 if (symnum
< mod
->num_symtab
) {
3425 *value
= mod
->symtab
[symnum
].st_value
;
3426 *type
= mod
->symtab
[symnum
].st_info
;
3427 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
3429 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3430 *exported
= is_exported(name
, *value
, mod
);
3434 symnum
-= mod
->num_symtab
;
3440 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3444 for (i
= 0; i
< mod
->num_symtab
; i
++)
3445 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
3446 mod
->symtab
[i
].st_info
!= 'U')
3447 return mod
->symtab
[i
].st_value
;
3451 /* Look for this name: can be of form module:name. */
3452 unsigned long module_kallsyms_lookup_name(const char *name
)
3456 unsigned long ret
= 0;
3458 /* Don't lock: we're in enough trouble already. */
3460 if ((colon
= strchr(name
, ':')) != NULL
) {
3462 if ((mod
= find_module(name
)) != NULL
)
3463 ret
= mod_find_symname(mod
, colon
+1);
3466 list_for_each_entry_rcu(mod
, &modules
, list
)
3467 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3474 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3475 struct module
*, unsigned long),
3482 list_for_each_entry(mod
, &modules
, list
) {
3483 for (i
= 0; i
< mod
->num_symtab
; i
++) {
3484 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
3485 mod
, mod
->symtab
[i
].st_value
);
3492 #endif /* CONFIG_KALLSYMS */
3494 static char *module_flags(struct module
*mod
, char *buf
)
3499 mod
->state
== MODULE_STATE_GOING
||
3500 mod
->state
== MODULE_STATE_COMING
) {
3502 bx
+= module_flags_taint(mod
, buf
+ bx
);
3503 /* Show a - for module-is-being-unloaded */
3504 if (mod
->state
== MODULE_STATE_GOING
)
3506 /* Show a + for module-is-being-loaded */
3507 if (mod
->state
== MODULE_STATE_COMING
)
3516 #ifdef CONFIG_PROC_FS
3517 /* Called by the /proc file system to return a list of modules. */
3518 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3520 mutex_lock(&module_mutex
);
3521 return seq_list_start(&modules
, *pos
);
3524 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3526 return seq_list_next(p
, &modules
, pos
);
3529 static void m_stop(struct seq_file
*m
, void *p
)
3531 mutex_unlock(&module_mutex
);
3534 static int m_show(struct seq_file
*m
, void *p
)
3536 struct module
*mod
= list_entry(p
, struct module
, list
);
3539 seq_printf(m
, "%s %u",
3540 mod
->name
, mod
->init_size
+ mod
->core_size
);
3541 print_unload_info(m
, mod
);
3543 /* Informative for users. */
3544 seq_printf(m
, " %s",
3545 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3546 mod
->state
== MODULE_STATE_COMING
? "Loading":
3548 /* Used by oprofile and other similar tools. */
3549 seq_printf(m
, " 0x%pK", mod
->module_core
);
3553 seq_printf(m
, " %s", module_flags(mod
, buf
));
3555 seq_printf(m
, "\n");
3559 /* Format: modulename size refcount deps address
3561 Where refcount is a number or -, and deps is a comma-separated list
3564 static const struct seq_operations modules_op
= {
3571 static int modules_open(struct inode
*inode
, struct file
*file
)
3573 return seq_open(file
, &modules_op
);
3576 static const struct file_operations proc_modules_operations
= {
3577 .open
= modules_open
,
3579 .llseek
= seq_lseek
,
3580 .release
= seq_release
,
3583 static int __init
proc_modules_init(void)
3585 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3588 module_init(proc_modules_init
);
3591 /* Given an address, look for it in the module exception tables. */
3592 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3594 const struct exception_table_entry
*e
= NULL
;
3598 list_for_each_entry_rcu(mod
, &modules
, list
) {
3599 if (mod
->num_exentries
== 0)
3602 e
= search_extable(mod
->extable
,
3603 mod
->extable
+ mod
->num_exentries
- 1,
3610 /* Now, if we found one, we are running inside it now, hence
3611 we cannot unload the module, hence no refcnt needed. */
3616 * is_module_address - is this address inside a module?
3617 * @addr: the address to check.
3619 * See is_module_text_address() if you simply want to see if the address
3620 * is code (not data).
3622 bool is_module_address(unsigned long addr
)
3627 ret
= __module_address(addr
) != NULL
;
3634 * __module_address - get the module which contains an address.
3635 * @addr: the address.
3637 * Must be called with preempt disabled or module mutex held so that
3638 * module doesn't get freed during this.
3640 struct module
*__module_address(unsigned long addr
)
3644 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3647 list_for_each_entry_rcu(mod
, &modules
, list
)
3648 if (within_module_core(addr
, mod
)
3649 || within_module_init(addr
, mod
))
3653 EXPORT_SYMBOL_GPL(__module_address
);
3656 * is_module_text_address - is this address inside module code?
3657 * @addr: the address to check.
3659 * See is_module_address() if you simply want to see if the address is
3660 * anywhere in a module. See kernel_text_address() for testing if an
3661 * address corresponds to kernel or module code.
3663 bool is_module_text_address(unsigned long addr
)
3668 ret
= __module_text_address(addr
) != NULL
;
3675 * __module_text_address - get the module whose code contains an address.
3676 * @addr: the address.
3678 * Must be called with preempt disabled or module mutex held so that
3679 * module doesn't get freed during this.
3681 struct module
*__module_text_address(unsigned long addr
)
3683 struct module
*mod
= __module_address(addr
);
3685 /* Make sure it's within the text section. */
3686 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3687 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3692 EXPORT_SYMBOL_GPL(__module_text_address
);
3694 /* Don't grab lock, we're oopsing. */
3695 void print_modules(void)
3700 printk(KERN_DEFAULT
"Modules linked in:");
3701 /* Most callers should already have preempt disabled, but make sure */
3703 list_for_each_entry_rcu(mod
, &modules
, list
)
3704 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3706 if (last_unloaded_module
[0])
3707 printk(" [last unloaded: %s]", last_unloaded_module
);
3711 #ifdef CONFIG_MODVERSIONS
3712 /* Generate the signature for all relevant module structures here.
3713 * If these change, we don't want to try to parse the module. */
3714 void module_layout(struct module
*mod
,
3715 struct modversion_info
*ver
,
3716 struct kernel_param
*kp
,
3717 struct kernel_symbol
*ks
,
3718 struct tracepoint
* const *tp
)
3721 EXPORT_SYMBOL(module_layout
);