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 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
193 if (try_module_get(mod
))
199 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
202 mod
->taints
|= (1U << flag
);
206 * A thread that wants to hold a reference to a module only while it
207 * is running can call this to safely exit. nfsd and lockd use this.
209 void __module_put_and_exit(struct module
*mod
, long code
)
214 EXPORT_SYMBOL(__module_put_and_exit
);
216 /* Find a module section: 0 means not found. */
217 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
221 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
222 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
223 /* Alloc bit cleared means "ignore it." */
224 if ((shdr
->sh_flags
& SHF_ALLOC
)
225 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
231 /* Find a module section, or NULL. */
232 static void *section_addr(const struct load_info
*info
, const char *name
)
234 /* Section 0 has sh_addr 0. */
235 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
238 /* Find a module section, or NULL. Fill in number of "objects" in section. */
239 static void *section_objs(const struct load_info
*info
,
244 unsigned int sec
= find_sec(info
, name
);
246 /* Section 0 has sh_addr 0 and sh_size 0. */
247 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
248 return (void *)info
->sechdrs
[sec
].sh_addr
;
251 /* Provided by the linker */
252 extern const struct kernel_symbol __start___ksymtab
[];
253 extern const struct kernel_symbol __stop___ksymtab
[];
254 extern const struct kernel_symbol __start___ksymtab_gpl
[];
255 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
256 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
257 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
258 extern const unsigned long __start___kcrctab
[];
259 extern const unsigned long __start___kcrctab_gpl
[];
260 extern const unsigned long __start___kcrctab_gpl_future
[];
261 #ifdef CONFIG_UNUSED_SYMBOLS
262 extern const struct kernel_symbol __start___ksymtab_unused
[];
263 extern const struct kernel_symbol __stop___ksymtab_unused
[];
264 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
265 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
266 extern const unsigned long __start___kcrctab_unused
[];
267 extern const unsigned long __start___kcrctab_unused_gpl
[];
270 #ifndef CONFIG_MODVERSIONS
271 #define symversion(base, idx) NULL
273 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
276 static bool each_symbol_in_section(const struct symsearch
*arr
,
277 unsigned int arrsize
,
278 struct module
*owner
,
279 bool (*fn
)(const struct symsearch
*syms
,
280 struct module
*owner
,
286 for (j
= 0; j
< arrsize
; j
++) {
287 if (fn(&arr
[j
], owner
, data
))
294 /* Returns true as soon as fn returns true, otherwise false. */
295 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
296 struct module
*owner
,
301 static const struct symsearch arr
[] = {
302 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
303 NOT_GPL_ONLY
, false },
304 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
305 __start___kcrctab_gpl
,
307 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
308 __start___kcrctab_gpl_future
,
309 WILL_BE_GPL_ONLY
, false },
310 #ifdef CONFIG_UNUSED_SYMBOLS
311 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
312 __start___kcrctab_unused
,
313 NOT_GPL_ONLY
, true },
314 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
315 __start___kcrctab_unused_gpl
,
320 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
323 list_for_each_entry_rcu(mod
, &modules
, list
) {
324 struct symsearch arr
[] = {
325 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
326 NOT_GPL_ONLY
, false },
327 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
330 { mod
->gpl_future_syms
,
331 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
332 mod
->gpl_future_crcs
,
333 WILL_BE_GPL_ONLY
, false },
334 #ifdef CONFIG_UNUSED_SYMBOLS
336 mod
->unused_syms
+ mod
->num_unused_syms
,
338 NOT_GPL_ONLY
, true },
339 { mod
->unused_gpl_syms
,
340 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
341 mod
->unused_gpl_crcs
,
346 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
351 EXPORT_SYMBOL_GPL(each_symbol_section
);
353 struct find_symbol_arg
{
360 struct module
*owner
;
361 const unsigned long *crc
;
362 const struct kernel_symbol
*sym
;
365 static bool check_symbol(const struct symsearch
*syms
,
366 struct module
*owner
,
367 unsigned int symnum
, void *data
)
369 struct find_symbol_arg
*fsa
= data
;
372 if (syms
->licence
== GPL_ONLY
)
374 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
375 printk(KERN_WARNING
"Symbol %s is being used "
376 "by a non-GPL module, which will not "
377 "be allowed in the future\n", fsa
->name
);
381 #ifdef CONFIG_UNUSED_SYMBOLS
382 if (syms
->unused
&& fsa
->warn
) {
383 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
384 "however this module is using it.\n", fsa
->name
);
386 "This symbol will go away in the future.\n");
388 "Please evalute if this is the right api to use and if "
389 "it really is, submit a report the linux kernel "
390 "mailinglist together with submitting your code for "
396 fsa
->crc
= symversion(syms
->crcs
, symnum
);
397 fsa
->sym
= &syms
->start
[symnum
];
401 static int cmp_name(const void *va
, const void *vb
)
404 const struct kernel_symbol
*b
;
406 return strcmp(a
, b
->name
);
409 static bool find_symbol_in_section(const struct symsearch
*syms
,
410 struct module
*owner
,
413 struct find_symbol_arg
*fsa
= data
;
414 struct kernel_symbol
*sym
;
416 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
417 sizeof(struct kernel_symbol
), cmp_name
);
419 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
425 /* Find a symbol and return it, along with, (optional) crc and
426 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
427 const struct kernel_symbol
*find_symbol(const char *name
,
428 struct module
**owner
,
429 const unsigned long **crc
,
433 struct find_symbol_arg fsa
;
439 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
447 pr_debug("Failed to find symbol %s\n", name
);
450 EXPORT_SYMBOL_GPL(find_symbol
);
452 /* Search for module by name: must hold module_mutex. */
453 struct module
*find_module(const char *name
)
457 list_for_each_entry(mod
, &modules
, list
) {
458 if (strcmp(mod
->name
, name
) == 0)
463 EXPORT_SYMBOL_GPL(find_module
);
467 static inline void __percpu
*mod_percpu(struct module
*mod
)
472 static int percpu_modalloc(struct module
*mod
,
473 unsigned long size
, unsigned long align
)
475 if (align
> PAGE_SIZE
) {
476 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
477 mod
->name
, align
, PAGE_SIZE
);
481 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
484 "%s: Could not allocate %lu bytes percpu data\n",
488 mod
->percpu_size
= size
;
492 static void percpu_modfree(struct module
*mod
)
494 free_percpu(mod
->percpu
);
497 static unsigned int find_pcpusec(struct load_info
*info
)
499 return find_sec(info
, ".data..percpu");
502 static void percpu_modcopy(struct module
*mod
,
503 const void *from
, unsigned long size
)
507 for_each_possible_cpu(cpu
)
508 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
512 * is_module_percpu_address - test whether address is from module static percpu
513 * @addr: address to test
515 * Test whether @addr belongs to module static percpu area.
518 * %true if @addr is from module static percpu area
520 bool is_module_percpu_address(unsigned long addr
)
527 list_for_each_entry_rcu(mod
, &modules
, list
) {
528 if (!mod
->percpu_size
)
530 for_each_possible_cpu(cpu
) {
531 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
533 if ((void *)addr
>= start
&&
534 (void *)addr
< start
+ mod
->percpu_size
) {
545 #else /* ... !CONFIG_SMP */
547 static inline void __percpu
*mod_percpu(struct module
*mod
)
551 static inline int percpu_modalloc(struct module
*mod
,
552 unsigned long size
, unsigned long align
)
556 static inline void percpu_modfree(struct module
*mod
)
559 static unsigned int find_pcpusec(struct load_info
*info
)
563 static inline void percpu_modcopy(struct module
*mod
,
564 const void *from
, unsigned long size
)
566 /* pcpusec should be 0, and size of that section should be 0. */
569 bool is_module_percpu_address(unsigned long addr
)
574 #endif /* CONFIG_SMP */
576 #define MODINFO_ATTR(field) \
577 static void setup_modinfo_##field(struct module *mod, const char *s) \
579 mod->field = kstrdup(s, GFP_KERNEL); \
581 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
582 struct module_kobject *mk, char *buffer) \
584 return sprintf(buffer, "%s\n", mk->mod->field); \
586 static int modinfo_##field##_exists(struct module *mod) \
588 return mod->field != NULL; \
590 static void free_modinfo_##field(struct module *mod) \
595 static struct module_attribute modinfo_##field = { \
596 .attr = { .name = __stringify(field), .mode = 0444 }, \
597 .show = show_modinfo_##field, \
598 .setup = setup_modinfo_##field, \
599 .test = modinfo_##field##_exists, \
600 .free = free_modinfo_##field, \
603 MODINFO_ATTR(version
);
604 MODINFO_ATTR(srcversion
);
606 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
608 #ifdef CONFIG_MODULE_UNLOAD
610 EXPORT_TRACEPOINT_SYMBOL(module_get
);
612 /* Init the unload section of the module. */
613 static int module_unload_init(struct module
*mod
)
615 mod
->refptr
= alloc_percpu(struct module_ref
);
619 INIT_LIST_HEAD(&mod
->source_list
);
620 INIT_LIST_HEAD(&mod
->target_list
);
622 /* Hold reference count during initialization. */
623 __this_cpu_write(mod
->refptr
->incs
, 1);
624 /* Backwards compatibility macros put refcount during init. */
625 mod
->waiter
= current
;
630 /* Does a already use b? */
631 static int already_uses(struct module
*a
, struct module
*b
)
633 struct module_use
*use
;
635 list_for_each_entry(use
, &b
->source_list
, source_list
) {
636 if (use
->source
== a
) {
637 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
641 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
647 * - we add 'a' as a "source", 'b' as a "target" of module use
648 * - the module_use is added to the list of 'b' sources (so
649 * 'b' can walk the list to see who sourced them), and of 'a'
650 * targets (so 'a' can see what modules it targets).
652 static int add_module_usage(struct module
*a
, struct module
*b
)
654 struct module_use
*use
;
656 pr_debug("Allocating new usage for %s.\n", a
->name
);
657 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
659 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
665 list_add(&use
->source_list
, &b
->source_list
);
666 list_add(&use
->target_list
, &a
->target_list
);
670 /* Module a uses b: caller needs module_mutex() */
671 int ref_module(struct module
*a
, struct module
*b
)
675 if (b
== NULL
|| already_uses(a
, b
))
678 /* If module isn't available, we fail. */
679 err
= strong_try_module_get(b
);
683 err
= add_module_usage(a
, b
);
690 EXPORT_SYMBOL_GPL(ref_module
);
692 /* Clear the unload stuff of the module. */
693 static void module_unload_free(struct module
*mod
)
695 struct module_use
*use
, *tmp
;
697 mutex_lock(&module_mutex
);
698 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
699 struct module
*i
= use
->target
;
700 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
702 list_del(&use
->source_list
);
703 list_del(&use
->target_list
);
706 mutex_unlock(&module_mutex
);
708 free_percpu(mod
->refptr
);
711 #ifdef CONFIG_MODULE_FORCE_UNLOAD
712 static inline int try_force_unload(unsigned int flags
)
714 int ret
= (flags
& O_TRUNC
);
716 add_taint(TAINT_FORCED_RMMOD
);
720 static inline int try_force_unload(unsigned int flags
)
724 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
733 /* Whole machine is stopped with interrupts off when this runs. */
734 static int __try_stop_module(void *_sref
)
736 struct stopref
*sref
= _sref
;
738 /* If it's not unused, quit unless we're forcing. */
739 if (module_refcount(sref
->mod
) != 0) {
740 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
744 /* Mark it as dying. */
745 sref
->mod
->state
= MODULE_STATE_GOING
;
749 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
751 if (flags
& O_NONBLOCK
) {
752 struct stopref sref
= { mod
, flags
, forced
};
754 return stop_machine(__try_stop_module
, &sref
, NULL
);
756 /* We don't need to stop the machine for this. */
757 mod
->state
= MODULE_STATE_GOING
;
763 unsigned long module_refcount(struct module
*mod
)
765 unsigned long incs
= 0, decs
= 0;
768 for_each_possible_cpu(cpu
)
769 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
771 * ensure the incs are added up after the decs.
772 * module_put ensures incs are visible before decs with smp_wmb.
774 * This 2-count scheme avoids the situation where the refcount
775 * for CPU0 is read, then CPU0 increments the module refcount,
776 * then CPU1 drops that refcount, then the refcount for CPU1 is
777 * read. We would record a decrement but not its corresponding
778 * increment so we would see a low count (disaster).
780 * Rare situation? But module_refcount can be preempted, and we
781 * might be tallying up 4096+ CPUs. So it is not impossible.
784 for_each_possible_cpu(cpu
)
785 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
788 EXPORT_SYMBOL(module_refcount
);
790 /* This exists whether we can unload or not */
791 static void free_module(struct module
*mod
);
793 static void wait_for_zero_refcount(struct module
*mod
)
795 /* Since we might sleep for some time, release the mutex first */
796 mutex_unlock(&module_mutex
);
798 pr_debug("Looking at refcount...\n");
799 set_current_state(TASK_UNINTERRUPTIBLE
);
800 if (module_refcount(mod
) == 0)
804 current
->state
= TASK_RUNNING
;
805 mutex_lock(&module_mutex
);
808 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
812 char name
[MODULE_NAME_LEN
];
815 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
818 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
820 name
[MODULE_NAME_LEN
-1] = '\0';
822 if (mutex_lock_interruptible(&module_mutex
) != 0)
825 mod
= find_module(name
);
831 if (!list_empty(&mod
->source_list
)) {
832 /* Other modules depend on us: get rid of them first. */
837 /* Doing init or already dying? */
838 if (mod
->state
!= MODULE_STATE_LIVE
) {
839 /* FIXME: if (force), slam module count and wake up
841 pr_debug("%s already dying\n", mod
->name
);
846 /* If it has an init func, it must have an exit func to unload */
847 if (mod
->init
&& !mod
->exit
) {
848 forced
= try_force_unload(flags
);
850 /* This module can't be removed */
856 /* Set this up before setting mod->state */
857 mod
->waiter
= current
;
859 /* Stop the machine so refcounts can't move and disable module. */
860 ret
= try_stop_module(mod
, flags
, &forced
);
864 /* Never wait if forced. */
865 if (!forced
&& module_refcount(mod
) != 0)
866 wait_for_zero_refcount(mod
);
868 mutex_unlock(&module_mutex
);
869 /* Final destruction now no one is using it. */
870 if (mod
->exit
!= NULL
)
872 blocking_notifier_call_chain(&module_notify_list
,
873 MODULE_STATE_GOING
, mod
);
874 async_synchronize_full();
876 /* Store the name of the last unloaded module for diagnostic purposes */
877 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
882 mutex_unlock(&module_mutex
);
886 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
888 struct module_use
*use
;
889 int printed_something
= 0;
891 seq_printf(m
, " %lu ", module_refcount(mod
));
893 /* Always include a trailing , so userspace can differentiate
894 between this and the old multi-field proc format. */
895 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
896 printed_something
= 1;
897 seq_printf(m
, "%s,", use
->source
->name
);
900 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
901 printed_something
= 1;
902 seq_printf(m
, "[permanent],");
905 if (!printed_something
)
909 void __symbol_put(const char *symbol
)
911 struct module
*owner
;
914 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
919 EXPORT_SYMBOL(__symbol_put
);
921 /* Note this assumes addr is a function, which it currently always is. */
922 void symbol_put_addr(void *addr
)
924 struct module
*modaddr
;
925 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
927 if (core_kernel_text(a
))
930 /* module_text_address is safe here: we're supposed to have reference
931 * to module from symbol_get, so it can't go away. */
932 modaddr
= __module_text_address(a
);
936 EXPORT_SYMBOL_GPL(symbol_put_addr
);
938 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
939 struct module_kobject
*mk
, char *buffer
)
941 return sprintf(buffer
, "%lu\n", module_refcount(mk
->mod
));
944 static struct module_attribute modinfo_refcnt
=
945 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
947 void __module_get(struct module
*module
)
951 __this_cpu_inc(module
->refptr
->incs
);
952 trace_module_get(module
, _RET_IP_
);
956 EXPORT_SYMBOL(__module_get
);
958 bool try_module_get(struct module
*module
)
965 if (likely(module_is_live(module
))) {
966 __this_cpu_inc(module
->refptr
->incs
);
967 trace_module_get(module
, _RET_IP_
);
975 EXPORT_SYMBOL(try_module_get
);
977 void module_put(struct module
*module
)
981 smp_wmb(); /* see comment in module_refcount */
982 __this_cpu_inc(module
->refptr
->decs
);
984 trace_module_put(module
, _RET_IP_
);
985 /* Maybe they're waiting for us to drop reference? */
986 if (unlikely(!module_is_live(module
)))
987 wake_up_process(module
->waiter
);
991 EXPORT_SYMBOL(module_put
);
993 #else /* !CONFIG_MODULE_UNLOAD */
994 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
996 /* We don't know the usage count, or what modules are using. */
997 seq_printf(m
, " - -");
1000 static inline void module_unload_free(struct module
*mod
)
1004 int ref_module(struct module
*a
, struct module
*b
)
1006 return strong_try_module_get(b
);
1008 EXPORT_SYMBOL_GPL(ref_module
);
1010 static inline int module_unload_init(struct module
*mod
)
1014 #endif /* CONFIG_MODULE_UNLOAD */
1016 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1020 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1022 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1024 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1026 if (mod
->taints
& (1 << TAINT_CRAP
))
1029 * TAINT_FORCED_RMMOD: could be added.
1030 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1036 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1037 struct module_kobject
*mk
, char *buffer
)
1039 const char *state
= "unknown";
1041 switch (mk
->mod
->state
) {
1042 case MODULE_STATE_LIVE
:
1045 case MODULE_STATE_COMING
:
1048 case MODULE_STATE_GOING
:
1052 return sprintf(buffer
, "%s\n", state
);
1055 static struct module_attribute modinfo_initstate
=
1056 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1058 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1059 struct module_kobject
*mk
,
1060 const char *buffer
, size_t count
)
1062 enum kobject_action action
;
1064 if (kobject_action_type(buffer
, count
, &action
) == 0)
1065 kobject_uevent(&mk
->kobj
, action
);
1069 struct module_attribute module_uevent
=
1070 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1072 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1073 struct module_kobject
*mk
, char *buffer
)
1075 return sprintf(buffer
, "%u\n", mk
->mod
->core_size
);
1078 static struct module_attribute modinfo_coresize
=
1079 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1081 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1082 struct module_kobject
*mk
, char *buffer
)
1084 return sprintf(buffer
, "%u\n", mk
->mod
->init_size
);
1087 static struct module_attribute modinfo_initsize
=
1088 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1090 static ssize_t
show_taint(struct module_attribute
*mattr
,
1091 struct module_kobject
*mk
, char *buffer
)
1095 l
= module_flags_taint(mk
->mod
, buffer
);
1100 static struct module_attribute modinfo_taint
=
1101 __ATTR(taint
, 0444, show_taint
, NULL
);
1103 static struct module_attribute
*modinfo_attrs
[] = {
1106 &modinfo_srcversion
,
1111 #ifdef CONFIG_MODULE_UNLOAD
1117 static const char vermagic
[] = VERMAGIC_STRING
;
1119 static int try_to_force_load(struct module
*mod
, const char *reason
)
1121 #ifdef CONFIG_MODULE_FORCE_LOAD
1122 if (!test_taint(TAINT_FORCED_MODULE
))
1123 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
1125 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1132 #ifdef CONFIG_MODVERSIONS
1133 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1134 static unsigned long maybe_relocated(unsigned long crc
,
1135 const struct module
*crc_owner
)
1137 #ifdef ARCH_RELOCATES_KCRCTAB
1138 if (crc_owner
== NULL
)
1139 return crc
- (unsigned long)reloc_start
;
1144 static int check_version(Elf_Shdr
*sechdrs
,
1145 unsigned int versindex
,
1146 const char *symname
,
1148 const unsigned long *crc
,
1149 const struct module
*crc_owner
)
1151 unsigned int i
, num_versions
;
1152 struct modversion_info
*versions
;
1154 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1158 /* No versions at all? modprobe --force does this. */
1160 return try_to_force_load(mod
, symname
) == 0;
1162 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1163 num_versions
= sechdrs
[versindex
].sh_size
1164 / sizeof(struct modversion_info
);
1166 for (i
= 0; i
< num_versions
; i
++) {
1167 if (strcmp(versions
[i
].name
, symname
) != 0)
1170 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1172 pr_debug("Found checksum %lX vs module %lX\n",
1173 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1177 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1178 mod
->name
, symname
);
1182 printk("%s: disagrees about version of symbol %s\n",
1183 mod
->name
, symname
);
1187 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1188 unsigned int versindex
,
1191 const unsigned long *crc
;
1193 /* Since this should be found in kernel (which can't be removed),
1194 * no locking is necessary. */
1195 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1198 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1202 /* First part is kernel version, which we ignore if module has crcs. */
1203 static inline int same_magic(const char *amagic
, const char *bmagic
,
1207 amagic
+= strcspn(amagic
, " ");
1208 bmagic
+= strcspn(bmagic
, " ");
1210 return strcmp(amagic
, bmagic
) == 0;
1213 static inline int check_version(Elf_Shdr
*sechdrs
,
1214 unsigned int versindex
,
1215 const char *symname
,
1217 const unsigned long *crc
,
1218 const struct module
*crc_owner
)
1223 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1224 unsigned int versindex
,
1230 static inline int same_magic(const char *amagic
, const char *bmagic
,
1233 return strcmp(amagic
, bmagic
) == 0;
1235 #endif /* CONFIG_MODVERSIONS */
1237 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1238 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1239 const struct load_info
*info
,
1243 struct module
*owner
;
1244 const struct kernel_symbol
*sym
;
1245 const unsigned long *crc
;
1248 mutex_lock(&module_mutex
);
1249 sym
= find_symbol(name
, &owner
, &crc
,
1250 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1254 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1256 sym
= ERR_PTR(-EINVAL
);
1260 err
= ref_module(mod
, owner
);
1267 /* We must make copy under the lock if we failed to get ref. */
1268 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1270 mutex_unlock(&module_mutex
);
1274 static const struct kernel_symbol
*
1275 resolve_symbol_wait(struct module
*mod
,
1276 const struct load_info
*info
,
1279 const struct kernel_symbol
*ksym
;
1280 char owner
[MODULE_NAME_LEN
];
1282 if (wait_event_interruptible_timeout(module_wq
,
1283 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1284 || PTR_ERR(ksym
) != -EBUSY
,
1286 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1293 * /sys/module/foo/sections stuff
1294 * J. Corbet <corbet@lwn.net>
1298 #ifdef CONFIG_KALLSYMS
1299 static inline bool sect_empty(const Elf_Shdr
*sect
)
1301 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1304 struct module_sect_attr
1306 struct module_attribute mattr
;
1308 unsigned long address
;
1311 struct module_sect_attrs
1313 struct attribute_group grp
;
1314 unsigned int nsections
;
1315 struct module_sect_attr attrs
[0];
1318 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1319 struct module_kobject
*mk
, char *buf
)
1321 struct module_sect_attr
*sattr
=
1322 container_of(mattr
, struct module_sect_attr
, mattr
);
1323 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1326 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1328 unsigned int section
;
1330 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1331 kfree(sect_attrs
->attrs
[section
].name
);
1335 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1337 unsigned int nloaded
= 0, i
, size
[2];
1338 struct module_sect_attrs
*sect_attrs
;
1339 struct module_sect_attr
*sattr
;
1340 struct attribute
**gattr
;
1342 /* Count loaded sections and allocate structures */
1343 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1344 if (!sect_empty(&info
->sechdrs
[i
]))
1346 size
[0] = ALIGN(sizeof(*sect_attrs
)
1347 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1348 sizeof(sect_attrs
->grp
.attrs
[0]));
1349 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1350 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1351 if (sect_attrs
== NULL
)
1354 /* Setup section attributes. */
1355 sect_attrs
->grp
.name
= "sections";
1356 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1358 sect_attrs
->nsections
= 0;
1359 sattr
= §_attrs
->attrs
[0];
1360 gattr
= §_attrs
->grp
.attrs
[0];
1361 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1362 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1363 if (sect_empty(sec
))
1365 sattr
->address
= sec
->sh_addr
;
1366 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1368 if (sattr
->name
== NULL
)
1370 sect_attrs
->nsections
++;
1371 sysfs_attr_init(&sattr
->mattr
.attr
);
1372 sattr
->mattr
.show
= module_sect_show
;
1373 sattr
->mattr
.store
= NULL
;
1374 sattr
->mattr
.attr
.name
= sattr
->name
;
1375 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1376 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1380 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1383 mod
->sect_attrs
= sect_attrs
;
1386 free_sect_attrs(sect_attrs
);
1389 static void remove_sect_attrs(struct module
*mod
)
1391 if (mod
->sect_attrs
) {
1392 sysfs_remove_group(&mod
->mkobj
.kobj
,
1393 &mod
->sect_attrs
->grp
);
1394 /* We are positive that no one is using any sect attrs
1395 * at this point. Deallocate immediately. */
1396 free_sect_attrs(mod
->sect_attrs
);
1397 mod
->sect_attrs
= NULL
;
1402 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1405 struct module_notes_attrs
{
1406 struct kobject
*dir
;
1408 struct bin_attribute attrs
[0];
1411 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1412 struct bin_attribute
*bin_attr
,
1413 char *buf
, loff_t pos
, size_t count
)
1416 * The caller checked the pos and count against our size.
1418 memcpy(buf
, bin_attr
->private + pos
, count
);
1422 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1425 if (notes_attrs
->dir
) {
1427 sysfs_remove_bin_file(notes_attrs
->dir
,
1428 ¬es_attrs
->attrs
[i
]);
1429 kobject_put(notes_attrs
->dir
);
1434 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1436 unsigned int notes
, loaded
, i
;
1437 struct module_notes_attrs
*notes_attrs
;
1438 struct bin_attribute
*nattr
;
1440 /* failed to create section attributes, so can't create notes */
1441 if (!mod
->sect_attrs
)
1444 /* Count notes sections and allocate structures. */
1446 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1447 if (!sect_empty(&info
->sechdrs
[i
]) &&
1448 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1454 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1455 + notes
* sizeof(notes_attrs
->attrs
[0]),
1457 if (notes_attrs
== NULL
)
1460 notes_attrs
->notes
= notes
;
1461 nattr
= ¬es_attrs
->attrs
[0];
1462 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1463 if (sect_empty(&info
->sechdrs
[i
]))
1465 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1466 sysfs_bin_attr_init(nattr
);
1467 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1468 nattr
->attr
.mode
= S_IRUGO
;
1469 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1470 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1471 nattr
->read
= module_notes_read
;
1477 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1478 if (!notes_attrs
->dir
)
1481 for (i
= 0; i
< notes
; ++i
)
1482 if (sysfs_create_bin_file(notes_attrs
->dir
,
1483 ¬es_attrs
->attrs
[i
]))
1486 mod
->notes_attrs
= notes_attrs
;
1490 free_notes_attrs(notes_attrs
, i
);
1493 static void remove_notes_attrs(struct module
*mod
)
1495 if (mod
->notes_attrs
)
1496 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1501 static inline void add_sect_attrs(struct module
*mod
,
1502 const struct load_info
*info
)
1506 static inline void remove_sect_attrs(struct module
*mod
)
1510 static inline void add_notes_attrs(struct module
*mod
,
1511 const struct load_info
*info
)
1515 static inline void remove_notes_attrs(struct module
*mod
)
1518 #endif /* CONFIG_KALLSYMS */
1520 static void add_usage_links(struct module
*mod
)
1522 #ifdef CONFIG_MODULE_UNLOAD
1523 struct module_use
*use
;
1526 mutex_lock(&module_mutex
);
1527 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1528 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1529 &mod
->mkobj
.kobj
, mod
->name
);
1531 mutex_unlock(&module_mutex
);
1535 static void del_usage_links(struct module
*mod
)
1537 #ifdef CONFIG_MODULE_UNLOAD
1538 struct module_use
*use
;
1540 mutex_lock(&module_mutex
);
1541 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1542 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1543 mutex_unlock(&module_mutex
);
1547 static int module_add_modinfo_attrs(struct module
*mod
)
1549 struct module_attribute
*attr
;
1550 struct module_attribute
*temp_attr
;
1554 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1555 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1557 if (!mod
->modinfo_attrs
)
1560 temp_attr
= mod
->modinfo_attrs
;
1561 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1563 (attr
->test
&& attr
->test(mod
))) {
1564 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1565 sysfs_attr_init(&temp_attr
->attr
);
1566 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1573 static void module_remove_modinfo_attrs(struct module
*mod
)
1575 struct module_attribute
*attr
;
1578 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1579 /* pick a field to test for end of list */
1580 if (!attr
->attr
.name
)
1582 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1586 kfree(mod
->modinfo_attrs
);
1589 static int mod_sysfs_init(struct module
*mod
)
1592 struct kobject
*kobj
;
1594 if (!module_sysfs_initialized
) {
1595 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1601 kobj
= kset_find_obj(module_kset
, mod
->name
);
1603 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1609 mod
->mkobj
.mod
= mod
;
1611 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1612 mod
->mkobj
.kobj
.kset
= module_kset
;
1613 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1616 kobject_put(&mod
->mkobj
.kobj
);
1618 /* delay uevent until full sysfs population */
1623 static int mod_sysfs_setup(struct module
*mod
,
1624 const struct load_info
*info
,
1625 struct kernel_param
*kparam
,
1626 unsigned int num_params
)
1630 err
= mod_sysfs_init(mod
);
1634 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1635 if (!mod
->holders_dir
) {
1640 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1642 goto out_unreg_holders
;
1644 err
= module_add_modinfo_attrs(mod
);
1646 goto out_unreg_param
;
1648 add_usage_links(mod
);
1649 add_sect_attrs(mod
, info
);
1650 add_notes_attrs(mod
, info
);
1652 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1656 module_param_sysfs_remove(mod
);
1658 kobject_put(mod
->holders_dir
);
1660 kobject_put(&mod
->mkobj
.kobj
);
1665 static void mod_sysfs_fini(struct module
*mod
)
1667 remove_notes_attrs(mod
);
1668 remove_sect_attrs(mod
);
1669 kobject_put(&mod
->mkobj
.kobj
);
1672 #else /* !CONFIG_SYSFS */
1674 static int mod_sysfs_setup(struct module
*mod
,
1675 const struct load_info
*info
,
1676 struct kernel_param
*kparam
,
1677 unsigned int num_params
)
1682 static void mod_sysfs_fini(struct module
*mod
)
1686 static void module_remove_modinfo_attrs(struct module
*mod
)
1690 static void del_usage_links(struct module
*mod
)
1694 #endif /* CONFIG_SYSFS */
1696 static void mod_sysfs_teardown(struct module
*mod
)
1698 del_usage_links(mod
);
1699 module_remove_modinfo_attrs(mod
);
1700 module_param_sysfs_remove(mod
);
1701 kobject_put(mod
->mkobj
.drivers_dir
);
1702 kobject_put(mod
->holders_dir
);
1703 mod_sysfs_fini(mod
);
1707 * unlink the module with the whole machine is stopped with interrupts off
1708 * - this defends against kallsyms not taking locks
1710 static int __unlink_module(void *_mod
)
1712 struct module
*mod
= _mod
;
1713 list_del(&mod
->list
);
1714 module_bug_cleanup(mod
);
1718 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1720 * LKM RO/NX protection: protect module's text/ro-data
1721 * from modification and any data from execution.
1723 void set_page_attributes(void *start
, void *end
, int (*set
)(unsigned long start
, int num_pages
))
1725 unsigned long begin_pfn
= PFN_DOWN((unsigned long)start
);
1726 unsigned long end_pfn
= PFN_DOWN((unsigned long)end
);
1728 if (end_pfn
> begin_pfn
)
1729 set(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1732 static void set_section_ro_nx(void *base
,
1733 unsigned long text_size
,
1734 unsigned long ro_size
,
1735 unsigned long total_size
)
1737 /* begin and end PFNs of the current subsection */
1738 unsigned long begin_pfn
;
1739 unsigned long end_pfn
;
1742 * Set RO for module text and RO-data:
1743 * - Always protect first page.
1744 * - Do not protect last partial page.
1747 set_page_attributes(base
, base
+ ro_size
, set_memory_ro
);
1750 * Set NX permissions for module data:
1751 * - Do not protect first partial page.
1752 * - Always protect last page.
1754 if (total_size
> text_size
) {
1755 begin_pfn
= PFN_UP((unsigned long)base
+ text_size
);
1756 end_pfn
= PFN_UP((unsigned long)base
+ total_size
);
1757 if (end_pfn
> begin_pfn
)
1758 set_memory_nx(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1762 static void unset_module_core_ro_nx(struct module
*mod
)
1764 set_page_attributes(mod
->module_core
+ mod
->core_text_size
,
1765 mod
->module_core
+ mod
->core_size
,
1767 set_page_attributes(mod
->module_core
,
1768 mod
->module_core
+ mod
->core_ro_size
,
1772 static void unset_module_init_ro_nx(struct module
*mod
)
1774 set_page_attributes(mod
->module_init
+ mod
->init_text_size
,
1775 mod
->module_init
+ mod
->init_size
,
1777 set_page_attributes(mod
->module_init
,
1778 mod
->module_init
+ mod
->init_ro_size
,
1782 /* Iterate through all modules and set each module's text as RW */
1783 void set_all_modules_text_rw(void)
1787 mutex_lock(&module_mutex
);
1788 list_for_each_entry_rcu(mod
, &modules
, list
) {
1789 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1790 set_page_attributes(mod
->module_core
,
1791 mod
->module_core
+ mod
->core_text_size
,
1794 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1795 set_page_attributes(mod
->module_init
,
1796 mod
->module_init
+ mod
->init_text_size
,
1800 mutex_unlock(&module_mutex
);
1803 /* Iterate through all modules and set each module's text as RO */
1804 void set_all_modules_text_ro(void)
1808 mutex_lock(&module_mutex
);
1809 list_for_each_entry_rcu(mod
, &modules
, list
) {
1810 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1811 set_page_attributes(mod
->module_core
,
1812 mod
->module_core
+ mod
->core_text_size
,
1815 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1816 set_page_attributes(mod
->module_init
,
1817 mod
->module_init
+ mod
->init_text_size
,
1821 mutex_unlock(&module_mutex
);
1824 static inline void set_section_ro_nx(void *base
, unsigned long text_size
, unsigned long ro_size
, unsigned long total_size
) { }
1825 static void unset_module_core_ro_nx(struct module
*mod
) { }
1826 static void unset_module_init_ro_nx(struct module
*mod
) { }
1829 void __weak
module_free(struct module
*mod
, void *module_region
)
1831 vfree(module_region
);
1834 void __weak
module_arch_cleanup(struct module
*mod
)
1838 /* Free a module, remove from lists, etc. */
1839 static void free_module(struct module
*mod
)
1841 trace_module_free(mod
);
1843 /* Delete from various lists */
1844 mutex_lock(&module_mutex
);
1845 stop_machine(__unlink_module
, mod
, NULL
);
1846 mutex_unlock(&module_mutex
);
1847 mod_sysfs_teardown(mod
);
1849 /* Remove dynamic debug info */
1850 ddebug_remove_module(mod
->name
);
1852 /* Arch-specific cleanup. */
1853 module_arch_cleanup(mod
);
1855 /* Module unload stuff */
1856 module_unload_free(mod
);
1858 /* Free any allocated parameters. */
1859 destroy_params(mod
->kp
, mod
->num_kp
);
1861 /* This may be NULL, but that's OK */
1862 unset_module_init_ro_nx(mod
);
1863 module_free(mod
, mod
->module_init
);
1865 percpu_modfree(mod
);
1867 /* Free lock-classes: */
1868 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1870 /* Finally, free the core (containing the module structure) */
1871 unset_module_core_ro_nx(mod
);
1872 module_free(mod
, mod
->module_core
);
1875 update_protections(current
->mm
);
1879 void *__symbol_get(const char *symbol
)
1881 struct module
*owner
;
1882 const struct kernel_symbol
*sym
;
1885 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1886 if (sym
&& strong_try_module_get(owner
))
1890 return sym
? (void *)sym
->value
: NULL
;
1892 EXPORT_SYMBOL_GPL(__symbol_get
);
1895 * Ensure that an exported symbol [global namespace] does not already exist
1896 * in the kernel or in some other module's exported symbol table.
1898 * You must hold the module_mutex.
1900 static int verify_export_symbols(struct module
*mod
)
1903 struct module
*owner
;
1904 const struct kernel_symbol
*s
;
1906 const struct kernel_symbol
*sym
;
1909 { mod
->syms
, mod
->num_syms
},
1910 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1911 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1912 #ifdef CONFIG_UNUSED_SYMBOLS
1913 { mod
->unused_syms
, mod
->num_unused_syms
},
1914 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1918 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1919 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1920 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1922 "%s: exports duplicate symbol %s"
1924 mod
->name
, s
->name
, module_name(owner
));
1932 /* Change all symbols so that st_value encodes the pointer directly. */
1933 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
1935 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
1936 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
1937 unsigned long secbase
;
1940 const struct kernel_symbol
*ksym
;
1942 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
1943 const char *name
= info
->strtab
+ sym
[i
].st_name
;
1945 switch (sym
[i
].st_shndx
) {
1947 /* We compiled with -fno-common. These are not
1948 supposed to happen. */
1949 pr_debug("Common symbol: %s\n", name
);
1950 printk("%s: please compile with -fno-common\n",
1956 /* Don't need to do anything */
1957 pr_debug("Absolute symbol: 0x%08lx\n",
1958 (long)sym
[i
].st_value
);
1962 ksym
= resolve_symbol_wait(mod
, info
, name
);
1963 /* Ok if resolved. */
1964 if (ksym
&& !IS_ERR(ksym
)) {
1965 sym
[i
].st_value
= ksym
->value
;
1970 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1973 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
1974 mod
->name
, name
, PTR_ERR(ksym
));
1975 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
1979 /* Divert to percpu allocation if a percpu var. */
1980 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
1981 secbase
= (unsigned long)mod_percpu(mod
);
1983 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1984 sym
[i
].st_value
+= secbase
;
1992 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
1997 /* Now do relocations. */
1998 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
1999 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2001 /* Not a valid relocation section? */
2002 if (infosec
>= info
->hdr
->e_shnum
)
2005 /* Don't bother with non-allocated sections */
2006 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2009 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2010 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2011 info
->index
.sym
, i
, mod
);
2012 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2013 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2014 info
->index
.sym
, i
, mod
);
2021 /* Additional bytes needed by arch in front of individual sections */
2022 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2023 unsigned int section
)
2025 /* default implementation just returns zero */
2029 /* Update size with this section: return offset. */
2030 static long get_offset(struct module
*mod
, unsigned int *size
,
2031 Elf_Shdr
*sechdr
, unsigned int section
)
2035 *size
+= arch_mod_section_prepend(mod
, section
);
2036 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2037 *size
= ret
+ sechdr
->sh_size
;
2041 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2042 might -- code, read-only data, read-write data, small data. Tally
2043 sizes, and place the offsets into sh_entsize fields: high bit means it
2045 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2047 static unsigned long const masks
[][2] = {
2048 /* NOTE: all executable code must be the first section
2049 * in this array; otherwise modify the text_size
2050 * finder in the two loops below */
2051 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2052 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2053 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2054 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2058 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2059 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2061 pr_debug("Core section allocation order:\n");
2062 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2063 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2064 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2065 const char *sname
= info
->secstrings
+ s
->sh_name
;
2067 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2068 || (s
->sh_flags
& masks
[m
][1])
2069 || s
->sh_entsize
!= ~0UL
2070 || strstarts(sname
, ".init"))
2072 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
2073 pr_debug("\t%s\n", sname
);
2076 case 0: /* executable */
2077 mod
->core_size
= debug_align(mod
->core_size
);
2078 mod
->core_text_size
= mod
->core_size
;
2080 case 1: /* RO: text and ro-data */
2081 mod
->core_size
= debug_align(mod
->core_size
);
2082 mod
->core_ro_size
= mod
->core_size
;
2084 case 3: /* whole core */
2085 mod
->core_size
= debug_align(mod
->core_size
);
2090 pr_debug("Init section allocation order:\n");
2091 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2092 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2093 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2094 const char *sname
= info
->secstrings
+ s
->sh_name
;
2096 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2097 || (s
->sh_flags
& masks
[m
][1])
2098 || s
->sh_entsize
!= ~0UL
2099 || !strstarts(sname
, ".init"))
2101 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
2102 | INIT_OFFSET_MASK
);
2103 pr_debug("\t%s\n", sname
);
2106 case 0: /* executable */
2107 mod
->init_size
= debug_align(mod
->init_size
);
2108 mod
->init_text_size
= mod
->init_size
;
2110 case 1: /* RO: text and ro-data */
2111 mod
->init_size
= debug_align(mod
->init_size
);
2112 mod
->init_ro_size
= mod
->init_size
;
2114 case 3: /* whole init */
2115 mod
->init_size
= debug_align(mod
->init_size
);
2121 static void set_license(struct module
*mod
, const char *license
)
2124 license
= "unspecified";
2126 if (!license_is_gpl_compatible(license
)) {
2127 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2128 printk(KERN_WARNING
"%s: module license '%s' taints "
2129 "kernel.\n", mod
->name
, license
);
2130 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2134 /* Parse tag=value strings from .modinfo section */
2135 static char *next_string(char *string
, unsigned long *secsize
)
2137 /* Skip non-zero chars */
2140 if ((*secsize
)-- <= 1)
2144 /* Skip any zero padding. */
2145 while (!string
[0]) {
2147 if ((*secsize
)-- <= 1)
2153 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2156 unsigned int taglen
= strlen(tag
);
2157 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2158 unsigned long size
= infosec
->sh_size
;
2160 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2161 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2162 return p
+ taglen
+ 1;
2167 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2169 struct module_attribute
*attr
;
2172 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2174 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2178 static void free_modinfo(struct module
*mod
)
2180 struct module_attribute
*attr
;
2183 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2189 #ifdef CONFIG_KALLSYMS
2191 /* lookup symbol in given range of kernel_symbols */
2192 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2193 const struct kernel_symbol
*start
,
2194 const struct kernel_symbol
*stop
)
2196 return bsearch(name
, start
, stop
- start
,
2197 sizeof(struct kernel_symbol
), cmp_name
);
2200 static int is_exported(const char *name
, unsigned long value
,
2201 const struct module
*mod
)
2203 const struct kernel_symbol
*ks
;
2205 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2207 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2208 return ks
!= NULL
&& ks
->value
== value
;
2212 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2214 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2216 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2217 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2222 if (sym
->st_shndx
== SHN_UNDEF
)
2224 if (sym
->st_shndx
== SHN_ABS
)
2226 if (sym
->st_shndx
>= SHN_LORESERVE
)
2228 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2230 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2231 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2232 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2234 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2239 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2240 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2245 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2252 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2255 const Elf_Shdr
*sec
;
2257 if (src
->st_shndx
== SHN_UNDEF
2258 || src
->st_shndx
>= shnum
2262 sec
= sechdrs
+ src
->st_shndx
;
2263 if (!(sec
->sh_flags
& SHF_ALLOC
)
2264 #ifndef CONFIG_KALLSYMS_ALL
2265 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2267 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2274 * We only allocate and copy the strings needed by the parts of symtab
2275 * we keep. This is simple, but has the effect of making multiple
2276 * copies of duplicates. We could be more sophisticated, see
2277 * linux-kernel thread starting with
2278 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2280 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2282 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2283 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2285 unsigned int i
, nsrc
, ndst
, strtab_size
= 0;
2287 /* Put symbol section at end of init part of module. */
2288 symsect
->sh_flags
|= SHF_ALLOC
;
2289 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
2290 info
->index
.sym
) | INIT_OFFSET_MASK
;
2291 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2293 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2294 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2296 /* Compute total space required for the core symbols' strtab. */
2297 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2299 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2300 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2305 /* Append room for core symbols at end of core part. */
2306 info
->symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
2307 info
->stroffs
= mod
->core_size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2308 mod
->core_size
+= strtab_size
;
2310 /* Put string table section at end of init part of module. */
2311 strsect
->sh_flags
|= SHF_ALLOC
;
2312 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
2313 info
->index
.str
) | INIT_OFFSET_MASK
;
2314 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2317 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2319 unsigned int i
, ndst
;
2323 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2325 mod
->symtab
= (void *)symsec
->sh_addr
;
2326 mod
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2327 /* Make sure we get permanent strtab: don't use info->strtab. */
2328 mod
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2330 /* Set types up while we still have access to sections. */
2331 for (i
= 0; i
< mod
->num_symtab
; i
++)
2332 mod
->symtab
[i
].st_info
= elf_type(&mod
->symtab
[i
], info
);
2334 mod
->core_symtab
= dst
= mod
->module_core
+ info
->symoffs
;
2335 mod
->core_strtab
= s
= mod
->module_core
+ info
->stroffs
;
2337 for (ndst
= i
= 0; i
< mod
->num_symtab
; i
++) {
2339 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2341 dst
[ndst
++].st_name
= s
- mod
->core_strtab
;
2342 s
+= strlcpy(s
, &mod
->strtab
[src
[i
].st_name
],
2346 mod
->core_num_syms
= ndst
;
2349 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2353 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2356 #endif /* CONFIG_KALLSYMS */
2358 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2362 #ifdef CONFIG_DYNAMIC_DEBUG
2363 if (ddebug_add_module(debug
, num
, debug
->modname
))
2364 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2369 static void dynamic_debug_remove(struct _ddebug
*debug
)
2372 ddebug_remove_module(debug
->modname
);
2375 void * __weak
module_alloc(unsigned long size
)
2377 return vmalloc_exec(size
);
2380 static void *module_alloc_update_bounds(unsigned long size
)
2382 void *ret
= module_alloc(size
);
2385 mutex_lock(&module_mutex
);
2386 /* Update module bounds. */
2387 if ((unsigned long)ret
< module_addr_min
)
2388 module_addr_min
= (unsigned long)ret
;
2389 if ((unsigned long)ret
+ size
> module_addr_max
)
2390 module_addr_max
= (unsigned long)ret
+ size
;
2391 mutex_unlock(&module_mutex
);
2396 #ifdef CONFIG_DEBUG_KMEMLEAK
2397 static void kmemleak_load_module(const struct module
*mod
,
2398 const struct load_info
*info
)
2402 /* only scan the sections containing data */
2403 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2405 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2406 const char *name
= info
->secstrings
+ info
->sechdrs
[i
].sh_name
;
2407 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2409 if (!strstarts(name
, ".data") && !strstarts(name
, ".bss"))
2412 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2413 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2417 static inline void kmemleak_load_module(const struct module
*mod
,
2418 const struct load_info
*info
)
2423 #ifdef CONFIG_MODULE_SIG
2424 static int module_sig_check(struct load_info
*info
)
2427 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2428 const void *mod
= info
->hdr
;
2430 if (info
->len
> markerlen
&&
2431 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2432 /* We truncate the module to discard the signature */
2433 info
->len
-= markerlen
;
2434 err
= mod_verify_sig(mod
, &info
->len
);
2438 info
->sig_ok
= true;
2442 /* Not having a signature is only an error if we're strict. */
2443 if (err
< 0 && fips_enabled
)
2444 panic("Module verification failed with error %d in FIPS mode\n",
2446 if (err
== -ENOKEY
&& !sig_enforce
)
2451 #else /* !CONFIG_MODULE_SIG */
2452 static int module_sig_check(struct load_info
*info
)
2456 #endif /* !CONFIG_MODULE_SIG */
2458 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2459 static int elf_header_check(struct load_info
*info
)
2461 if (info
->len
< sizeof(*(info
->hdr
)))
2464 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2465 || info
->hdr
->e_type
!= ET_REL
2466 || !elf_check_arch(info
->hdr
)
2467 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2470 if (info
->hdr
->e_shoff
>= info
->len
2471 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2472 info
->len
- info
->hdr
->e_shoff
))
2478 /* Sets info->hdr and info->len. */
2479 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2480 struct load_info
*info
)
2485 if (info
->len
< sizeof(*(info
->hdr
)))
2488 err
= security_kernel_module_from_file(NULL
);
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
= security_kernel_module_from_file(file
);
2522 err
= vfs_getattr(file
->f_vfsmnt
, file
->f_dentry
, &stat
);
2526 if (stat
.size
> INT_MAX
) {
2530 info
->hdr
= vmalloc(stat
.size
);
2537 while (pos
< stat
.size
) {
2538 bytes
= kernel_read(file
, pos
, (char *)(info
->hdr
) + pos
,
2556 static void free_copy(struct load_info
*info
)
2561 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2565 /* This should always be true, but let's be sure. */
2566 info
->sechdrs
[0].sh_addr
= 0;
2568 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2569 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2570 if (shdr
->sh_type
!= SHT_NOBITS
2571 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2572 printk(KERN_ERR
"Module len %lu truncated\n",
2577 /* Mark all sections sh_addr with their address in the
2579 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2581 #ifndef CONFIG_MODULE_UNLOAD
2582 /* Don't load .exit sections */
2583 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2584 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2588 /* Track but don't keep modinfo and version sections. */
2589 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2590 info
->index
.vers
= 0; /* Pretend no __versions section! */
2592 info
->index
.vers
= find_sec(info
, "__versions");
2593 info
->index
.info
= find_sec(info
, ".modinfo");
2594 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2595 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2600 * Set up our basic convenience variables (pointers to section headers,
2601 * search for module section index etc), and do some basic section
2604 * Return the temporary module pointer (we'll replace it with the final
2605 * one when we move the module sections around).
2607 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2613 /* Set up the convenience variables */
2614 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2615 info
->secstrings
= (void *)info
->hdr
2616 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2618 err
= rewrite_section_headers(info
, flags
);
2620 return ERR_PTR(err
);
2622 /* Find internal symbols and strings. */
2623 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2624 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2625 info
->index
.sym
= i
;
2626 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2627 info
->strtab
= (char *)info
->hdr
2628 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2633 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2634 if (!info
->index
.mod
) {
2635 printk(KERN_WARNING
"No module found in object\n");
2636 return ERR_PTR(-ENOEXEC
);
2638 /* This is temporary: point mod into copy of data. */
2639 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2641 if (info
->index
.sym
== 0) {
2642 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2644 return ERR_PTR(-ENOEXEC
);
2647 info
->index
.pcpu
= find_pcpusec(info
);
2649 /* Check module struct version now, before we try to use module. */
2650 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2651 return ERR_PTR(-ENOEXEC
);
2656 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2658 const char *modmagic
= get_modinfo(info
, "vermagic");
2661 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2664 /* This is allowed: modprobe --force will invalidate it. */
2666 err
= try_to_force_load(mod
, "bad vermagic");
2669 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2670 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2671 mod
->name
, modmagic
, vermagic
);
2675 if (!get_modinfo(info
, "intree"))
2676 add_taint_module(mod
, TAINT_OOT_MODULE
);
2678 if (get_modinfo(info
, "staging")) {
2679 add_taint_module(mod
, TAINT_CRAP
);
2680 printk(KERN_WARNING
"%s: module is from the staging directory,"
2681 " the quality is unknown, you have been warned.\n",
2685 /* Set up license info based on the info section */
2686 set_license(mod
, get_modinfo(info
, "license"));
2691 static void find_module_sections(struct module
*mod
, struct load_info
*info
)
2693 mod
->kp
= section_objs(info
, "__param",
2694 sizeof(*mod
->kp
), &mod
->num_kp
);
2695 mod
->syms
= section_objs(info
, "__ksymtab",
2696 sizeof(*mod
->syms
), &mod
->num_syms
);
2697 mod
->crcs
= section_addr(info
, "__kcrctab");
2698 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2699 sizeof(*mod
->gpl_syms
),
2700 &mod
->num_gpl_syms
);
2701 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2702 mod
->gpl_future_syms
= section_objs(info
,
2703 "__ksymtab_gpl_future",
2704 sizeof(*mod
->gpl_future_syms
),
2705 &mod
->num_gpl_future_syms
);
2706 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2708 #ifdef CONFIG_UNUSED_SYMBOLS
2709 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2710 sizeof(*mod
->unused_syms
),
2711 &mod
->num_unused_syms
);
2712 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2713 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2714 sizeof(*mod
->unused_gpl_syms
),
2715 &mod
->num_unused_gpl_syms
);
2716 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2718 #ifdef CONFIG_CONSTRUCTORS
2719 mod
->ctors
= section_objs(info
, ".ctors",
2720 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2723 #ifdef CONFIG_TRACEPOINTS
2724 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2725 sizeof(*mod
->tracepoints_ptrs
),
2726 &mod
->num_tracepoints
);
2728 #ifdef HAVE_JUMP_LABEL
2729 mod
->jump_entries
= section_objs(info
, "__jump_table",
2730 sizeof(*mod
->jump_entries
),
2731 &mod
->num_jump_entries
);
2733 #ifdef CONFIG_EVENT_TRACING
2734 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2735 sizeof(*mod
->trace_events
),
2736 &mod
->num_trace_events
);
2738 * This section contains pointers to allocated objects in the trace
2739 * code and not scanning it leads to false positives.
2741 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2742 mod
->num_trace_events
, GFP_KERNEL
);
2744 #ifdef CONFIG_TRACING
2745 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2746 sizeof(*mod
->trace_bprintk_fmt_start
),
2747 &mod
->num_trace_bprintk_fmt
);
2749 * This section contains pointers to allocated objects in the trace
2750 * code and not scanning it leads to false positives.
2752 kmemleak_scan_area(mod
->trace_bprintk_fmt_start
,
2753 sizeof(*mod
->trace_bprintk_fmt_start
) *
2754 mod
->num_trace_bprintk_fmt
, GFP_KERNEL
);
2756 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2757 /* sechdrs[0].sh_size is always zero */
2758 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2759 sizeof(*mod
->ftrace_callsites
),
2760 &mod
->num_ftrace_callsites
);
2763 mod
->extable
= section_objs(info
, "__ex_table",
2764 sizeof(*mod
->extable
), &mod
->num_exentries
);
2766 if (section_addr(info
, "__obsparm"))
2767 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2770 info
->debug
= section_objs(info
, "__verbose",
2771 sizeof(*info
->debug
), &info
->num_debug
);
2774 static int move_module(struct module
*mod
, struct load_info
*info
)
2779 /* Do the allocs. */
2780 ptr
= module_alloc_update_bounds(mod
->core_size
);
2782 * The pointer to this block is stored in the module structure
2783 * which is inside the block. Just mark it as not being a
2786 kmemleak_not_leak(ptr
);
2790 memset(ptr
, 0, mod
->core_size
);
2791 mod
->module_core
= ptr
;
2793 if (mod
->init_size
) {
2794 ptr
= module_alloc_update_bounds(mod
->init_size
);
2796 * The pointer to this block is stored in the module structure
2797 * which is inside the block. This block doesn't need to be
2798 * scanned as it contains data and code that will be freed
2799 * after the module is initialized.
2801 kmemleak_ignore(ptr
);
2803 module_free(mod
, mod
->module_core
);
2806 memset(ptr
, 0, mod
->init_size
);
2807 mod
->module_init
= ptr
;
2809 mod
->module_init
= NULL
;
2811 /* Transfer each section which specifies SHF_ALLOC */
2812 pr_debug("final section addresses:\n");
2813 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
2815 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2817 if (!(shdr
->sh_flags
& SHF_ALLOC
))
2820 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
2821 dest
= mod
->module_init
2822 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
2824 dest
= mod
->module_core
+ shdr
->sh_entsize
;
2826 if (shdr
->sh_type
!= SHT_NOBITS
)
2827 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
2828 /* Update sh_addr to point to copy in image. */
2829 shdr
->sh_addr
= (unsigned long)dest
;
2830 pr_debug("\t0x%lx %s\n",
2831 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
2837 static int check_module_license_and_versions(struct module
*mod
)
2840 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2841 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2842 * using GPL-only symbols it needs.
2844 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2845 add_taint(TAINT_PROPRIETARY_MODULE
);
2847 /* driverloader was caught wrongly pretending to be under GPL */
2848 if (strcmp(mod
->name
, "driverloader") == 0)
2849 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2851 /* lve claims to be GPL but upstream won't provide source */
2852 if (strcmp(mod
->name
, "lve") == 0)
2853 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2855 #ifdef CONFIG_MODVERSIONS
2856 if ((mod
->num_syms
&& !mod
->crcs
)
2857 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2858 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2859 #ifdef CONFIG_UNUSED_SYMBOLS
2860 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2861 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2864 return try_to_force_load(mod
,
2865 "no versions for exported symbols");
2871 static void flush_module_icache(const struct module
*mod
)
2873 mm_segment_t old_fs
;
2875 /* flush the icache in correct context */
2880 * Flush the instruction cache, since we've played with text.
2881 * Do it before processing of module parameters, so the module
2882 * can provide parameter accessor functions of its own.
2884 if (mod
->module_init
)
2885 flush_icache_range((unsigned long)mod
->module_init
,
2886 (unsigned long)mod
->module_init
2888 flush_icache_range((unsigned long)mod
->module_core
,
2889 (unsigned long)mod
->module_core
+ mod
->core_size
);
2894 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
2902 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
2904 /* Module within temporary copy. */
2909 mod
= setup_load_info(info
, flags
);
2913 err
= check_modinfo(mod
, info
, flags
);
2915 return ERR_PTR(err
);
2917 /* Allow arches to frob section contents and sizes. */
2918 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
2919 info
->secstrings
, mod
);
2923 pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
2924 if (pcpusec
->sh_size
) {
2925 /* We have a special allocation for this section. */
2926 err
= percpu_modalloc(mod
,
2927 pcpusec
->sh_size
, pcpusec
->sh_addralign
);
2930 pcpusec
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2933 /* Determine total sizes, and put offsets in sh_entsize. For now
2934 this is done generically; there doesn't appear to be any
2935 special cases for the architectures. */
2936 layout_sections(mod
, info
);
2937 layout_symtab(mod
, info
);
2939 /* Allocate and move to the final place */
2940 err
= move_module(mod
, info
);
2944 /* Module has been copied to its final place now: return it. */
2945 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2946 kmemleak_load_module(mod
, info
);
2950 percpu_modfree(mod
);
2952 return ERR_PTR(err
);
2955 /* mod is no longer valid after this! */
2956 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
2958 percpu_modfree(mod
);
2959 module_free(mod
, mod
->module_init
);
2960 module_free(mod
, mod
->module_core
);
2963 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
2964 const Elf_Shdr
*sechdrs
,
2970 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
2972 /* Sort exception table now relocations are done. */
2973 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2975 /* Copy relocated percpu area over. */
2976 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
2977 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
2979 /* Setup kallsyms-specific fields. */
2980 add_kallsyms(mod
, info
);
2982 /* Arch-specific module finalizing. */
2983 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
2986 /* Is this module of this name done loading? No locks held. */
2987 static bool finished_loading(const char *name
)
2992 mutex_lock(&module_mutex
);
2993 mod
= find_module(name
);
2994 ret
= !mod
|| mod
->state
!= MODULE_STATE_COMING
;
2995 mutex_unlock(&module_mutex
);
3000 /* Call module constructors. */
3001 static void do_mod_ctors(struct module
*mod
)
3003 #ifdef CONFIG_CONSTRUCTORS
3006 for (i
= 0; i
< mod
->num_ctors
; i
++)
3011 /* This is where the real work happens */
3012 static int do_init_module(struct module
*mod
)
3016 blocking_notifier_call_chain(&module_notify_list
,
3017 MODULE_STATE_COMING
, mod
);
3019 /* Set RO and NX regions for core */
3020 set_section_ro_nx(mod
->module_core
,
3021 mod
->core_text_size
,
3025 /* Set RO and NX regions for init */
3026 set_section_ro_nx(mod
->module_init
,
3027 mod
->init_text_size
,
3032 /* Start the module */
3033 if (mod
->init
!= NULL
)
3034 ret
= do_one_initcall(mod
->init
);
3036 /* Init routine failed: abort. Try to protect us from
3037 buggy refcounters. */
3038 mod
->state
= MODULE_STATE_GOING
;
3039 synchronize_sched();
3041 blocking_notifier_call_chain(&module_notify_list
,
3042 MODULE_STATE_GOING
, mod
);
3044 wake_up_all(&module_wq
);
3049 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3050 "%s: loading module anyway...\n",
3051 __func__
, mod
->name
, ret
,
3056 /* Now it's a first class citizen! */
3057 mod
->state
= MODULE_STATE_LIVE
;
3058 blocking_notifier_call_chain(&module_notify_list
,
3059 MODULE_STATE_LIVE
, mod
);
3061 /* We need to finish all async code before the module init sequence is done */
3062 async_synchronize_full();
3064 mutex_lock(&module_mutex
);
3065 /* Drop initial reference. */
3067 trim_init_extable(mod
);
3068 #ifdef CONFIG_KALLSYMS
3069 mod
->num_symtab
= mod
->core_num_syms
;
3070 mod
->symtab
= mod
->core_symtab
;
3071 mod
->strtab
= mod
->core_strtab
;
3073 unset_module_init_ro_nx(mod
);
3074 module_free(mod
, mod
->module_init
);
3075 mod
->module_init
= NULL
;
3077 mod
->init_ro_size
= 0;
3078 mod
->init_text_size
= 0;
3079 mutex_unlock(&module_mutex
);
3080 wake_up_all(&module_wq
);
3085 static int may_init_module(void)
3087 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3093 /* Allocate and load the module: note that size of section 0 is always
3094 zero, and we rely on this for optional sections. */
3095 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3098 struct module
*mod
, *old
;
3101 err
= module_sig_check(info
);
3105 err
= elf_header_check(info
);
3109 /* Figure out module layout, and allocate all the memory. */
3110 mod
= layout_and_allocate(info
, flags
);
3116 #ifdef CONFIG_MODULE_SIG
3117 mod
->sig_ok
= info
->sig_ok
;
3119 add_taint_module(mod
, TAINT_FORCED_MODULE
);
3122 /* Now module is in final location, initialize linked lists, etc. */
3123 err
= module_unload_init(mod
);
3127 /* Now we've got everything in the final locations, we can
3128 * find optional sections. */
3129 find_module_sections(mod
, info
);
3131 err
= check_module_license_and_versions(mod
);
3135 /* Set up MODINFO_ATTR fields */
3136 setup_modinfo(mod
, info
);
3138 /* Fix up syms, so that st_value is a pointer to location. */
3139 err
= simplify_symbols(mod
, info
);
3143 err
= apply_relocations(mod
, info
);
3147 err
= post_relocation(mod
, info
);
3151 flush_module_icache(mod
);
3153 /* Now copy in args */
3154 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3155 if (IS_ERR(mod
->args
)) {
3156 err
= PTR_ERR(mod
->args
);
3157 goto free_arch_cleanup
;
3160 /* Mark state as coming so strong_try_module_get() ignores us. */
3161 mod
->state
= MODULE_STATE_COMING
;
3163 /* Now sew it into the lists so we can get lockdep and oops
3164 * info during argument parsing. No one should access us, since
3165 * strong_try_module_get() will fail.
3166 * lockdep/oops can run asynchronous, so use the RCU list insertion
3167 * function to insert in a way safe to concurrent readers.
3168 * The mutex protects against concurrent writers.
3171 mutex_lock(&module_mutex
);
3172 if ((old
= find_module(mod
->name
)) != NULL
) {
3173 if (old
->state
== MODULE_STATE_COMING
) {
3174 /* Wait in case it fails to load. */
3175 mutex_unlock(&module_mutex
);
3176 err
= wait_event_interruptible(module_wq
,
3177 finished_loading(mod
->name
));
3179 goto free_arch_cleanup
;
3186 /* This has to be done once we're sure module name is unique. */
3187 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3189 /* Find duplicate symbols */
3190 err
= verify_export_symbols(mod
);
3194 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3195 list_add_rcu(&mod
->list
, &modules
);
3196 mutex_unlock(&module_mutex
);
3198 /* Module is ready to execute: parsing args may do that. */
3199 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3200 -32768, 32767, &ddebug_dyndbg_module_param_cb
);
3204 /* Link in to syfs. */
3205 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3209 /* Get rid of temporary copy. */
3213 trace_module_load(mod
);
3215 return do_init_module(mod
);
3218 mutex_lock(&module_mutex
);
3219 /* Unlink carefully: kallsyms could be walking list. */
3220 list_del_rcu(&mod
->list
);
3221 module_bug_cleanup(mod
);
3222 wake_up_all(&module_wq
);
3224 dynamic_debug_remove(info
->debug
);
3226 mutex_unlock(&module_mutex
);
3227 synchronize_sched();
3230 module_arch_cleanup(mod
);
3234 module_unload_free(mod
);
3236 module_deallocate(mod
, info
);
3242 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3243 unsigned long, len
, const char __user
*, uargs
)
3246 struct load_info info
= { };
3248 err
= may_init_module();
3252 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3255 err
= copy_module_from_user(umod
, len
, &info
);
3259 return load_module(&info
, uargs
, 0);
3262 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3265 struct load_info info
= { };
3267 err
= may_init_module();
3271 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3273 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3274 |MODULE_INIT_IGNORE_VERMAGIC
))
3277 err
= copy_module_from_fd(fd
, &info
);
3281 return load_module(&info
, uargs
, flags
);
3284 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3286 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3289 #ifdef CONFIG_KALLSYMS
3291 * This ignores the intensely annoying "mapping symbols" found
3292 * in ARM ELF files: $a, $t and $d.
3294 static inline int is_arm_mapping_symbol(const char *str
)
3296 return str
[0] == '$' && strchr("atd", str
[1])
3297 && (str
[2] == '\0' || str
[2] == '.');
3300 static const char *get_ksymbol(struct module
*mod
,
3302 unsigned long *size
,
3303 unsigned long *offset
)
3305 unsigned int i
, best
= 0;
3306 unsigned long nextval
;
3308 /* At worse, next value is at end of module */
3309 if (within_module_init(addr
, mod
))
3310 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
3312 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
3314 /* Scan for closest preceding symbol, and next symbol. (ELF
3315 starts real symbols at 1). */
3316 for (i
= 1; i
< mod
->num_symtab
; i
++) {
3317 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3320 /* We ignore unnamed symbols: they're uninformative
3321 * and inserted at a whim. */
3322 if (mod
->symtab
[i
].st_value
<= addr
3323 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
3324 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3325 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3327 if (mod
->symtab
[i
].st_value
> addr
3328 && mod
->symtab
[i
].st_value
< nextval
3329 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3330 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3331 nextval
= mod
->symtab
[i
].st_value
;
3338 *size
= nextval
- mod
->symtab
[best
].st_value
;
3340 *offset
= addr
- mod
->symtab
[best
].st_value
;
3341 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
3344 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3345 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3346 const char *module_address_lookup(unsigned long addr
,
3347 unsigned long *size
,
3348 unsigned long *offset
,
3353 const char *ret
= NULL
;
3356 list_for_each_entry_rcu(mod
, &modules
, list
) {
3357 if (within_module_init(addr
, mod
) ||
3358 within_module_core(addr
, mod
)) {
3360 *modname
= mod
->name
;
3361 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3365 /* Make a copy in here where it's safe */
3367 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3374 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3379 list_for_each_entry_rcu(mod
, &modules
, list
) {
3380 if (within_module_init(addr
, mod
) ||
3381 within_module_core(addr
, mod
)) {
3384 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3387 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3397 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3398 unsigned long *offset
, char *modname
, char *name
)
3403 list_for_each_entry_rcu(mod
, &modules
, list
) {
3404 if (within_module_init(addr
, mod
) ||
3405 within_module_core(addr
, mod
)) {
3408 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3412 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3414 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3424 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3425 char *name
, char *module_name
, int *exported
)
3430 list_for_each_entry_rcu(mod
, &modules
, list
) {
3431 if (symnum
< mod
->num_symtab
) {
3432 *value
= mod
->symtab
[symnum
].st_value
;
3433 *type
= mod
->symtab
[symnum
].st_info
;
3434 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
3436 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3437 *exported
= is_exported(name
, *value
, mod
);
3441 symnum
-= mod
->num_symtab
;
3447 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3451 for (i
= 0; i
< mod
->num_symtab
; i
++)
3452 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
3453 mod
->symtab
[i
].st_info
!= 'U')
3454 return mod
->symtab
[i
].st_value
;
3458 /* Look for this name: can be of form module:name. */
3459 unsigned long module_kallsyms_lookup_name(const char *name
)
3463 unsigned long ret
= 0;
3465 /* Don't lock: we're in enough trouble already. */
3467 if ((colon
= strchr(name
, ':')) != NULL
) {
3469 if ((mod
= find_module(name
)) != NULL
)
3470 ret
= mod_find_symname(mod
, colon
+1);
3473 list_for_each_entry_rcu(mod
, &modules
, list
)
3474 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3481 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3482 struct module
*, unsigned long),
3489 list_for_each_entry(mod
, &modules
, list
) {
3490 for (i
= 0; i
< mod
->num_symtab
; i
++) {
3491 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
3492 mod
, mod
->symtab
[i
].st_value
);
3499 #endif /* CONFIG_KALLSYMS */
3501 static char *module_flags(struct module
*mod
, char *buf
)
3506 mod
->state
== MODULE_STATE_GOING
||
3507 mod
->state
== MODULE_STATE_COMING
) {
3509 bx
+= module_flags_taint(mod
, buf
+ bx
);
3510 /* Show a - for module-is-being-unloaded */
3511 if (mod
->state
== MODULE_STATE_GOING
)
3513 /* Show a + for module-is-being-loaded */
3514 if (mod
->state
== MODULE_STATE_COMING
)
3523 #ifdef CONFIG_PROC_FS
3524 /* Called by the /proc file system to return a list of modules. */
3525 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3527 mutex_lock(&module_mutex
);
3528 return seq_list_start(&modules
, *pos
);
3531 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3533 return seq_list_next(p
, &modules
, pos
);
3536 static void m_stop(struct seq_file
*m
, void *p
)
3538 mutex_unlock(&module_mutex
);
3541 static int m_show(struct seq_file
*m
, void *p
)
3543 struct module
*mod
= list_entry(p
, struct module
, list
);
3546 seq_printf(m
, "%s %u",
3547 mod
->name
, mod
->init_size
+ mod
->core_size
);
3548 print_unload_info(m
, mod
);
3550 /* Informative for users. */
3551 seq_printf(m
, " %s",
3552 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3553 mod
->state
== MODULE_STATE_COMING
? "Loading":
3555 /* Used by oprofile and other similar tools. */
3556 seq_printf(m
, " 0x%pK", mod
->module_core
);
3560 seq_printf(m
, " %s", module_flags(mod
, buf
));
3562 seq_printf(m
, "\n");
3566 /* Format: modulename size refcount deps address
3568 Where refcount is a number or -, and deps is a comma-separated list
3571 static const struct seq_operations modules_op
= {
3578 static int modules_open(struct inode
*inode
, struct file
*file
)
3580 return seq_open(file
, &modules_op
);
3583 static const struct file_operations proc_modules_operations
= {
3584 .open
= modules_open
,
3586 .llseek
= seq_lseek
,
3587 .release
= seq_release
,
3590 static int __init
proc_modules_init(void)
3592 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3595 module_init(proc_modules_init
);
3598 /* Given an address, look for it in the module exception tables. */
3599 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3601 const struct exception_table_entry
*e
= NULL
;
3605 list_for_each_entry_rcu(mod
, &modules
, list
) {
3606 if (mod
->num_exentries
== 0)
3609 e
= search_extable(mod
->extable
,
3610 mod
->extable
+ mod
->num_exentries
- 1,
3617 /* Now, if we found one, we are running inside it now, hence
3618 we cannot unload the module, hence no refcnt needed. */
3623 * is_module_address - is this address inside a module?
3624 * @addr: the address to check.
3626 * See is_module_text_address() if you simply want to see if the address
3627 * is code (not data).
3629 bool is_module_address(unsigned long addr
)
3634 ret
= __module_address(addr
) != NULL
;
3641 * __module_address - get the module which contains an address.
3642 * @addr: the address.
3644 * Must be called with preempt disabled or module mutex held so that
3645 * module doesn't get freed during this.
3647 struct module
*__module_address(unsigned long addr
)
3651 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3654 list_for_each_entry_rcu(mod
, &modules
, list
)
3655 if (within_module_core(addr
, mod
)
3656 || within_module_init(addr
, mod
))
3660 EXPORT_SYMBOL_GPL(__module_address
);
3663 * is_module_text_address - is this address inside module code?
3664 * @addr: the address to check.
3666 * See is_module_address() if you simply want to see if the address is
3667 * anywhere in a module. See kernel_text_address() for testing if an
3668 * address corresponds to kernel or module code.
3670 bool is_module_text_address(unsigned long addr
)
3675 ret
= __module_text_address(addr
) != NULL
;
3682 * __module_text_address - get the module whose code contains an address.
3683 * @addr: the address.
3685 * Must be called with preempt disabled or module mutex held so that
3686 * module doesn't get freed during this.
3688 struct module
*__module_text_address(unsigned long addr
)
3690 struct module
*mod
= __module_address(addr
);
3692 /* Make sure it's within the text section. */
3693 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3694 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3699 EXPORT_SYMBOL_GPL(__module_text_address
);
3701 /* Don't grab lock, we're oopsing. */
3702 void print_modules(void)
3707 printk(KERN_DEFAULT
"Modules linked in:");
3708 /* Most callers should already have preempt disabled, but make sure */
3710 list_for_each_entry_rcu(mod
, &modules
, list
)
3711 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3713 if (last_unloaded_module
[0])
3714 printk(" [last unloaded: %s]", last_unloaded_module
);
3718 #ifdef CONFIG_MODVERSIONS
3719 /* Generate the signature for all relevant module structures here.
3720 * If these change, we don't want to try to parse the module. */
3721 void module_layout(struct module
*mod
,
3722 struct modversion_info
*ver
,
3723 struct kernel_param
*kp
,
3724 struct kernel_symbol
*ks
,
3725 struct tracepoint
* const *tp
)
3728 EXPORT_SYMBOL(module_layout
);