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
;
182 #ifdef CONFIG_KALLSYMS
183 unsigned long mod_kallsyms_init_off
;
186 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
190 /* We require a truly strong try_module_get(): 0 means failure due to
191 ongoing or failed initialization etc. */
192 static inline int strong_try_module_get(struct module
*mod
)
194 BUG_ON(mod
&& mod
->state
== MODULE_STATE_UNFORMED
);
195 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
197 if (try_module_get(mod
))
203 static inline void add_taint_module(struct module
*mod
, unsigned flag
,
204 enum lockdep_ok lockdep_ok
)
206 add_taint(flag
, lockdep_ok
);
207 mod
->taints
|= (1U << flag
);
211 * A thread that wants to hold a reference to a module only while it
212 * is running can call this to safely exit. nfsd and lockd use this.
214 void __module_put_and_exit(struct module
*mod
, long code
)
219 EXPORT_SYMBOL(__module_put_and_exit
);
221 /* Find a module section: 0 means not found. */
222 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
226 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
227 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
228 /* Alloc bit cleared means "ignore it." */
229 if ((shdr
->sh_flags
& SHF_ALLOC
)
230 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
236 /* Find a module section, or NULL. */
237 static void *section_addr(const struct load_info
*info
, const char *name
)
239 /* Section 0 has sh_addr 0. */
240 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
243 /* Find a module section, or NULL. Fill in number of "objects" in section. */
244 static void *section_objs(const struct load_info
*info
,
249 unsigned int sec
= find_sec(info
, name
);
251 /* Section 0 has sh_addr 0 and sh_size 0. */
252 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
253 return (void *)info
->sechdrs
[sec
].sh_addr
;
256 /* Provided by the linker */
257 extern const struct kernel_symbol __start___ksymtab
[];
258 extern const struct kernel_symbol __stop___ksymtab
[];
259 extern const struct kernel_symbol __start___ksymtab_gpl
[];
260 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
261 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
262 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
263 extern const unsigned long __start___kcrctab
[];
264 extern const unsigned long __start___kcrctab_gpl
[];
265 extern const unsigned long __start___kcrctab_gpl_future
[];
266 #ifdef CONFIG_UNUSED_SYMBOLS
267 extern const struct kernel_symbol __start___ksymtab_unused
[];
268 extern const struct kernel_symbol __stop___ksymtab_unused
[];
269 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
270 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
271 extern const unsigned long __start___kcrctab_unused
[];
272 extern const unsigned long __start___kcrctab_unused_gpl
[];
275 #ifndef CONFIG_MODVERSIONS
276 #define symversion(base, idx) NULL
278 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
281 static bool each_symbol_in_section(const struct symsearch
*arr
,
282 unsigned int arrsize
,
283 struct module
*owner
,
284 bool (*fn
)(const struct symsearch
*syms
,
285 struct module
*owner
,
291 for (j
= 0; j
< arrsize
; j
++) {
292 if (fn(&arr
[j
], owner
, data
))
299 /* Returns true as soon as fn returns true, otherwise false. */
300 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
301 struct module
*owner
,
306 static const struct symsearch arr
[] = {
307 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
308 NOT_GPL_ONLY
, false },
309 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
310 __start___kcrctab_gpl
,
312 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
313 __start___kcrctab_gpl_future
,
314 WILL_BE_GPL_ONLY
, false },
315 #ifdef CONFIG_UNUSED_SYMBOLS
316 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
317 __start___kcrctab_unused
,
318 NOT_GPL_ONLY
, true },
319 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
320 __start___kcrctab_unused_gpl
,
325 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
328 list_for_each_entry_rcu(mod
, &modules
, list
) {
329 struct symsearch arr
[] = {
330 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
331 NOT_GPL_ONLY
, false },
332 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
335 { mod
->gpl_future_syms
,
336 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
337 mod
->gpl_future_crcs
,
338 WILL_BE_GPL_ONLY
, false },
339 #ifdef CONFIG_UNUSED_SYMBOLS
341 mod
->unused_syms
+ mod
->num_unused_syms
,
343 NOT_GPL_ONLY
, true },
344 { mod
->unused_gpl_syms
,
345 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
346 mod
->unused_gpl_crcs
,
351 if (mod
->state
== MODULE_STATE_UNFORMED
)
354 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
359 EXPORT_SYMBOL_GPL(each_symbol_section
);
361 struct find_symbol_arg
{
368 struct module
*owner
;
369 const unsigned long *crc
;
370 const struct kernel_symbol
*sym
;
373 static bool check_symbol(const struct symsearch
*syms
,
374 struct module
*owner
,
375 unsigned int symnum
, void *data
)
377 struct find_symbol_arg
*fsa
= data
;
380 if (syms
->licence
== GPL_ONLY
)
382 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
383 printk(KERN_WARNING
"Symbol %s is being used "
384 "by a non-GPL module, which will not "
385 "be allowed in the future\n", fsa
->name
);
389 #ifdef CONFIG_UNUSED_SYMBOLS
390 if (syms
->unused
&& fsa
->warn
) {
391 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
392 "however this module is using it.\n", fsa
->name
);
394 "This symbol will go away in the future.\n");
396 "Please evalute if this is the right api to use and if "
397 "it really is, submit a report the linux kernel "
398 "mailinglist together with submitting your code for "
404 fsa
->crc
= symversion(syms
->crcs
, symnum
);
405 fsa
->sym
= &syms
->start
[symnum
];
409 static int cmp_name(const void *va
, const void *vb
)
412 const struct kernel_symbol
*b
;
414 return strcmp(a
, b
->name
);
417 static bool find_symbol_in_section(const struct symsearch
*syms
,
418 struct module
*owner
,
421 struct find_symbol_arg
*fsa
= data
;
422 struct kernel_symbol
*sym
;
424 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
425 sizeof(struct kernel_symbol
), cmp_name
);
427 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
433 /* Find a symbol and return it, along with, (optional) crc and
434 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
435 const struct kernel_symbol
*find_symbol(const char *name
,
436 struct module
**owner
,
437 const unsigned long **crc
,
441 struct find_symbol_arg fsa
;
447 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
455 pr_debug("Failed to find symbol %s\n", name
);
458 EXPORT_SYMBOL_GPL(find_symbol
);
460 /* Search for module by name: must hold module_mutex. */
461 static struct module
*find_module_all(const char *name
,
466 list_for_each_entry(mod
, &modules
, list
) {
467 if (!even_unformed
&& mod
->state
== MODULE_STATE_UNFORMED
)
469 if (strcmp(mod
->name
, name
) == 0)
475 struct module
*find_module(const char *name
)
477 return find_module_all(name
, false);
479 EXPORT_SYMBOL_GPL(find_module
);
483 static inline void __percpu
*mod_percpu(struct module
*mod
)
488 static int percpu_modalloc(struct module
*mod
,
489 unsigned long size
, unsigned long align
)
491 if (align
> PAGE_SIZE
) {
492 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
493 mod
->name
, align
, PAGE_SIZE
);
497 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
500 "%s: Could not allocate %lu bytes percpu data\n",
504 mod
->percpu_size
= size
;
508 static void percpu_modfree(struct module
*mod
)
510 free_percpu(mod
->percpu
);
513 static unsigned int find_pcpusec(struct load_info
*info
)
515 return find_sec(info
, ".data..percpu");
518 static void percpu_modcopy(struct module
*mod
,
519 const void *from
, unsigned long size
)
523 for_each_possible_cpu(cpu
)
524 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
528 * is_module_percpu_address - test whether address is from module static percpu
529 * @addr: address to test
531 * Test whether @addr belongs to module static percpu area.
534 * %true if @addr is from module static percpu area
536 bool is_module_percpu_address(unsigned long addr
)
543 list_for_each_entry_rcu(mod
, &modules
, list
) {
544 if (mod
->state
== MODULE_STATE_UNFORMED
)
546 if (!mod
->percpu_size
)
548 for_each_possible_cpu(cpu
) {
549 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
551 if ((void *)addr
>= start
&&
552 (void *)addr
< start
+ mod
->percpu_size
) {
563 #else /* ... !CONFIG_SMP */
565 static inline void __percpu
*mod_percpu(struct module
*mod
)
569 static inline int percpu_modalloc(struct module
*mod
,
570 unsigned long size
, unsigned long align
)
574 static inline void percpu_modfree(struct module
*mod
)
577 static unsigned int find_pcpusec(struct load_info
*info
)
581 static inline void percpu_modcopy(struct module
*mod
,
582 const void *from
, unsigned long size
)
584 /* pcpusec should be 0, and size of that section should be 0. */
587 bool is_module_percpu_address(unsigned long addr
)
592 #endif /* CONFIG_SMP */
594 #define MODINFO_ATTR(field) \
595 static void setup_modinfo_##field(struct module *mod, const char *s) \
597 mod->field = kstrdup(s, GFP_KERNEL); \
599 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
600 struct module_kobject *mk, char *buffer) \
602 return sprintf(buffer, "%s\n", mk->mod->field); \
604 static int modinfo_##field##_exists(struct module *mod) \
606 return mod->field != NULL; \
608 static void free_modinfo_##field(struct module *mod) \
613 static struct module_attribute modinfo_##field = { \
614 .attr = { .name = __stringify(field), .mode = 0444 }, \
615 .show = show_modinfo_##field, \
616 .setup = setup_modinfo_##field, \
617 .test = modinfo_##field##_exists, \
618 .free = free_modinfo_##field, \
621 MODINFO_ATTR(version
);
622 MODINFO_ATTR(srcversion
);
624 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
626 #ifdef CONFIG_MODULE_UNLOAD
628 EXPORT_TRACEPOINT_SYMBOL(module_get
);
630 /* Init the unload section of the module. */
631 static int module_unload_init(struct module
*mod
)
633 mod
->refptr
= alloc_percpu(struct module_ref
);
637 INIT_LIST_HEAD(&mod
->source_list
);
638 INIT_LIST_HEAD(&mod
->target_list
);
640 /* Hold reference count during initialization. */
641 __this_cpu_write(mod
->refptr
->incs
, 1);
642 /* Backwards compatibility macros put refcount during init. */
643 mod
->waiter
= current
;
648 /* Does a already use b? */
649 static int already_uses(struct module
*a
, struct module
*b
)
651 struct module_use
*use
;
653 list_for_each_entry(use
, &b
->source_list
, source_list
) {
654 if (use
->source
== a
) {
655 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
659 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
665 * - we add 'a' as a "source", 'b' as a "target" of module use
666 * - the module_use is added to the list of 'b' sources (so
667 * 'b' can walk the list to see who sourced them), and of 'a'
668 * targets (so 'a' can see what modules it targets).
670 static int add_module_usage(struct module
*a
, struct module
*b
)
672 struct module_use
*use
;
674 pr_debug("Allocating new usage for %s.\n", a
->name
);
675 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
677 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
683 list_add(&use
->source_list
, &b
->source_list
);
684 list_add(&use
->target_list
, &a
->target_list
);
688 /* Module a uses b: caller needs module_mutex() */
689 int ref_module(struct module
*a
, struct module
*b
)
693 if (b
== NULL
|| already_uses(a
, b
))
696 /* If module isn't available, we fail. */
697 err
= strong_try_module_get(b
);
701 err
= add_module_usage(a
, b
);
708 EXPORT_SYMBOL_GPL(ref_module
);
710 /* Clear the unload stuff of the module. */
711 static void module_unload_free(struct module
*mod
)
713 struct module_use
*use
, *tmp
;
715 mutex_lock(&module_mutex
);
716 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
717 struct module
*i
= use
->target
;
718 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
720 list_del(&use
->source_list
);
721 list_del(&use
->target_list
);
724 mutex_unlock(&module_mutex
);
726 free_percpu(mod
->refptr
);
729 #ifdef CONFIG_MODULE_FORCE_UNLOAD
730 static inline int try_force_unload(unsigned int flags
)
732 int ret
= (flags
& O_TRUNC
);
734 add_taint(TAINT_FORCED_RMMOD
, LOCKDEP_NOW_UNRELIABLE
);
738 static inline int try_force_unload(unsigned int flags
)
742 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
751 /* Whole machine is stopped with interrupts off when this runs. */
752 static int __try_stop_module(void *_sref
)
754 struct stopref
*sref
= _sref
;
756 /* If it's not unused, quit unless we're forcing. */
757 if (module_refcount(sref
->mod
) != 0) {
758 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
762 /* Mark it as dying. */
763 sref
->mod
->state
= MODULE_STATE_GOING
;
767 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
769 if (flags
& O_NONBLOCK
) {
770 struct stopref sref
= { mod
, flags
, forced
};
772 return stop_machine(__try_stop_module
, &sref
, NULL
);
774 /* We don't need to stop the machine for this. */
775 mod
->state
= MODULE_STATE_GOING
;
781 unsigned long module_refcount(struct module
*mod
)
783 unsigned long incs
= 0, decs
= 0;
786 for_each_possible_cpu(cpu
)
787 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
789 * ensure the incs are added up after the decs.
790 * module_put ensures incs are visible before decs with smp_wmb.
792 * This 2-count scheme avoids the situation where the refcount
793 * for CPU0 is read, then CPU0 increments the module refcount,
794 * then CPU1 drops that refcount, then the refcount for CPU1 is
795 * read. We would record a decrement but not its corresponding
796 * increment so we would see a low count (disaster).
798 * Rare situation? But module_refcount can be preempted, and we
799 * might be tallying up 4096+ CPUs. So it is not impossible.
802 for_each_possible_cpu(cpu
)
803 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
806 EXPORT_SYMBOL(module_refcount
);
808 /* This exists whether we can unload or not */
809 static void free_module(struct module
*mod
);
811 static void wait_for_zero_refcount(struct module
*mod
)
813 /* Since we might sleep for some time, release the mutex first */
814 mutex_unlock(&module_mutex
);
816 pr_debug("Looking at refcount...\n");
817 set_current_state(TASK_UNINTERRUPTIBLE
);
818 if (module_refcount(mod
) == 0)
822 current
->state
= TASK_RUNNING
;
823 mutex_lock(&module_mutex
);
826 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
830 char name
[MODULE_NAME_LEN
];
833 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
836 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
838 name
[MODULE_NAME_LEN
-1] = '\0';
840 if (mutex_lock_interruptible(&module_mutex
) != 0)
843 mod
= find_module(name
);
849 if (!list_empty(&mod
->source_list
)) {
850 /* Other modules depend on us: get rid of them first. */
855 /* Doing init or already dying? */
856 if (mod
->state
!= MODULE_STATE_LIVE
) {
857 /* FIXME: if (force), slam module count and wake up
859 pr_debug("%s already dying\n", mod
->name
);
864 /* If it has an init func, it must have an exit func to unload */
865 if (mod
->init
&& !mod
->exit
) {
866 forced
= try_force_unload(flags
);
868 /* This module can't be removed */
874 /* Set this up before setting mod->state */
875 mod
->waiter
= current
;
877 /* Stop the machine so refcounts can't move and disable module. */
878 ret
= try_stop_module(mod
, flags
, &forced
);
882 /* Never wait if forced. */
883 if (!forced
&& module_refcount(mod
) != 0)
884 wait_for_zero_refcount(mod
);
886 mutex_unlock(&module_mutex
);
887 /* Final destruction now no one is using it. */
888 if (mod
->exit
!= NULL
)
890 blocking_notifier_call_chain(&module_notify_list
,
891 MODULE_STATE_GOING
, mod
);
892 async_synchronize_full();
894 /* Store the name of the last unloaded module for diagnostic purposes */
895 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
900 mutex_unlock(&module_mutex
);
904 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
906 struct module_use
*use
;
907 int printed_something
= 0;
909 seq_printf(m
, " %lu ", module_refcount(mod
));
911 /* Always include a trailing , so userspace can differentiate
912 between this and the old multi-field proc format. */
913 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
914 printed_something
= 1;
915 seq_printf(m
, "%s,", use
->source
->name
);
918 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
919 printed_something
= 1;
920 seq_printf(m
, "[permanent],");
923 if (!printed_something
)
927 void __symbol_put(const char *symbol
)
929 struct module
*owner
;
932 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
937 EXPORT_SYMBOL(__symbol_put
);
939 /* Note this assumes addr is a function, which it currently always is. */
940 void symbol_put_addr(void *addr
)
942 struct module
*modaddr
;
943 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
945 if (core_kernel_text(a
))
949 * Even though we hold a reference on the module; we still need to
950 * disable preemption in order to safely traverse the data structure.
953 modaddr
= __module_text_address(a
);
958 EXPORT_SYMBOL_GPL(symbol_put_addr
);
960 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
961 struct module_kobject
*mk
, char *buffer
)
963 return sprintf(buffer
, "%lu\n", module_refcount(mk
->mod
));
966 static struct module_attribute modinfo_refcnt
=
967 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
969 void __module_get(struct module
*module
)
973 __this_cpu_inc(module
->refptr
->incs
);
974 trace_module_get(module
, _RET_IP_
);
978 EXPORT_SYMBOL(__module_get
);
980 bool try_module_get(struct module
*module
)
987 if (likely(module_is_live(module
))) {
988 __this_cpu_inc(module
->refptr
->incs
);
989 trace_module_get(module
, _RET_IP_
);
997 EXPORT_SYMBOL(try_module_get
);
999 void module_put(struct module
*module
)
1003 smp_wmb(); /* see comment in module_refcount */
1004 __this_cpu_inc(module
->refptr
->decs
);
1006 trace_module_put(module
, _RET_IP_
);
1007 /* Maybe they're waiting for us to drop reference? */
1008 if (unlikely(!module_is_live(module
)))
1009 wake_up_process(module
->waiter
);
1013 EXPORT_SYMBOL(module_put
);
1015 #else /* !CONFIG_MODULE_UNLOAD */
1016 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1018 /* We don't know the usage count, or what modules are using. */
1019 seq_printf(m
, " - -");
1022 static inline void module_unload_free(struct module
*mod
)
1026 int ref_module(struct module
*a
, struct module
*b
)
1028 return strong_try_module_get(b
);
1030 EXPORT_SYMBOL_GPL(ref_module
);
1032 static inline int module_unload_init(struct module
*mod
)
1036 #endif /* CONFIG_MODULE_UNLOAD */
1038 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1042 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1044 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1046 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1048 if (mod
->taints
& (1 << TAINT_CRAP
))
1051 * TAINT_FORCED_RMMOD: could be added.
1052 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1058 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1059 struct module_kobject
*mk
, char *buffer
)
1061 const char *state
= "unknown";
1063 switch (mk
->mod
->state
) {
1064 case MODULE_STATE_LIVE
:
1067 case MODULE_STATE_COMING
:
1070 case MODULE_STATE_GOING
:
1076 return sprintf(buffer
, "%s\n", state
);
1079 static struct module_attribute modinfo_initstate
=
1080 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1082 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1083 struct module_kobject
*mk
,
1084 const char *buffer
, size_t count
)
1086 enum kobject_action action
;
1088 if (kobject_action_type(buffer
, count
, &action
) == 0)
1089 kobject_uevent(&mk
->kobj
, action
);
1093 struct module_attribute module_uevent
=
1094 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1096 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1097 struct module_kobject
*mk
, char *buffer
)
1099 return sprintf(buffer
, "%u\n", mk
->mod
->core_size
);
1102 static struct module_attribute modinfo_coresize
=
1103 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1105 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1106 struct module_kobject
*mk
, char *buffer
)
1108 return sprintf(buffer
, "%u\n", mk
->mod
->init_size
);
1111 static struct module_attribute modinfo_initsize
=
1112 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1114 static ssize_t
show_taint(struct module_attribute
*mattr
,
1115 struct module_kobject
*mk
, char *buffer
)
1119 l
= module_flags_taint(mk
->mod
, buffer
);
1124 static struct module_attribute modinfo_taint
=
1125 __ATTR(taint
, 0444, show_taint
, NULL
);
1127 static struct module_attribute
*modinfo_attrs
[] = {
1130 &modinfo_srcversion
,
1135 #ifdef CONFIG_MODULE_UNLOAD
1141 static const char vermagic
[] = VERMAGIC_STRING
;
1143 static int try_to_force_load(struct module
*mod
, const char *reason
)
1145 #ifdef CONFIG_MODULE_FORCE_LOAD
1146 if (!test_taint(TAINT_FORCED_MODULE
))
1147 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
1149 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
1156 #ifdef CONFIG_MODVERSIONS
1157 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1158 static unsigned long maybe_relocated(unsigned long crc
,
1159 const struct module
*crc_owner
)
1161 #ifdef ARCH_RELOCATES_KCRCTAB
1162 if (crc_owner
== NULL
)
1163 return crc
- (unsigned long)reloc_start
;
1168 static int check_version(Elf_Shdr
*sechdrs
,
1169 unsigned int versindex
,
1170 const char *symname
,
1172 const unsigned long *crc
,
1173 const struct module
*crc_owner
)
1175 unsigned int i
, num_versions
;
1176 struct modversion_info
*versions
;
1178 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1182 /* No versions at all? modprobe --force does this. */
1184 return try_to_force_load(mod
, symname
) == 0;
1186 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1187 num_versions
= sechdrs
[versindex
].sh_size
1188 / sizeof(struct modversion_info
);
1190 for (i
= 0; i
< num_versions
; i
++) {
1191 if (strcmp(versions
[i
].name
, symname
) != 0)
1194 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1196 pr_debug("Found checksum %lX vs module %lX\n",
1197 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1201 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1202 mod
->name
, symname
);
1206 printk("%s: disagrees about version of symbol %s\n",
1207 mod
->name
, symname
);
1211 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1212 unsigned int versindex
,
1215 const unsigned long *crc
;
1217 /* Since this should be found in kernel (which can't be removed),
1218 * no locking is necessary. */
1219 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout
), NULL
,
1222 return check_version(sechdrs
, versindex
,
1223 VMLINUX_SYMBOL_STR(module_layout
), mod
, crc
,
1227 /* First part is kernel version, which we ignore if module has crcs. */
1228 static inline int same_magic(const char *amagic
, const char *bmagic
,
1232 amagic
+= strcspn(amagic
, " ");
1233 bmagic
+= strcspn(bmagic
, " ");
1235 return strcmp(amagic
, bmagic
) == 0;
1238 static inline int check_version(Elf_Shdr
*sechdrs
,
1239 unsigned int versindex
,
1240 const char *symname
,
1242 const unsigned long *crc
,
1243 const struct module
*crc_owner
)
1248 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1249 unsigned int versindex
,
1255 static inline int same_magic(const char *amagic
, const char *bmagic
,
1258 return strcmp(amagic
, bmagic
) == 0;
1260 #endif /* CONFIG_MODVERSIONS */
1262 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1263 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1264 const struct load_info
*info
,
1268 struct module
*owner
;
1269 const struct kernel_symbol
*sym
;
1270 const unsigned long *crc
;
1273 mutex_lock(&module_mutex
);
1274 sym
= find_symbol(name
, &owner
, &crc
,
1275 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1279 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1281 sym
= ERR_PTR(-EINVAL
);
1285 err
= ref_module(mod
, owner
);
1292 /* We must make copy under the lock if we failed to get ref. */
1293 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1295 mutex_unlock(&module_mutex
);
1299 static const struct kernel_symbol
*
1300 resolve_symbol_wait(struct module
*mod
,
1301 const struct load_info
*info
,
1304 const struct kernel_symbol
*ksym
;
1305 char owner
[MODULE_NAME_LEN
];
1307 if (wait_event_interruptible_timeout(module_wq
,
1308 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1309 || PTR_ERR(ksym
) != -EBUSY
,
1311 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1318 * /sys/module/foo/sections stuff
1319 * J. Corbet <corbet@lwn.net>
1323 #ifdef CONFIG_KALLSYMS
1324 static inline bool sect_empty(const Elf_Shdr
*sect
)
1326 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1329 struct module_sect_attr
1331 struct module_attribute mattr
;
1333 unsigned long address
;
1336 struct module_sect_attrs
1338 struct attribute_group grp
;
1339 unsigned int nsections
;
1340 struct module_sect_attr attrs
[0];
1343 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1344 struct module_kobject
*mk
, char *buf
)
1346 struct module_sect_attr
*sattr
=
1347 container_of(mattr
, struct module_sect_attr
, mattr
);
1348 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1351 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1353 unsigned int section
;
1355 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1356 kfree(sect_attrs
->attrs
[section
].name
);
1360 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1362 unsigned int nloaded
= 0, i
, size
[2];
1363 struct module_sect_attrs
*sect_attrs
;
1364 struct module_sect_attr
*sattr
;
1365 struct attribute
**gattr
;
1367 /* Count loaded sections and allocate structures */
1368 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1369 if (!sect_empty(&info
->sechdrs
[i
]))
1371 size
[0] = ALIGN(sizeof(*sect_attrs
)
1372 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1373 sizeof(sect_attrs
->grp
.attrs
[0]));
1374 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1375 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1376 if (sect_attrs
== NULL
)
1379 /* Setup section attributes. */
1380 sect_attrs
->grp
.name
= "sections";
1381 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1383 sect_attrs
->nsections
= 0;
1384 sattr
= §_attrs
->attrs
[0];
1385 gattr
= §_attrs
->grp
.attrs
[0];
1386 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1387 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1388 if (sect_empty(sec
))
1390 sattr
->address
= sec
->sh_addr
;
1391 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1393 if (sattr
->name
== NULL
)
1395 sect_attrs
->nsections
++;
1396 sysfs_attr_init(&sattr
->mattr
.attr
);
1397 sattr
->mattr
.show
= module_sect_show
;
1398 sattr
->mattr
.store
= NULL
;
1399 sattr
->mattr
.attr
.name
= sattr
->name
;
1400 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1401 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1405 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1408 mod
->sect_attrs
= sect_attrs
;
1411 free_sect_attrs(sect_attrs
);
1414 static void remove_sect_attrs(struct module
*mod
)
1416 if (mod
->sect_attrs
) {
1417 sysfs_remove_group(&mod
->mkobj
.kobj
,
1418 &mod
->sect_attrs
->grp
);
1419 /* We are positive that no one is using any sect attrs
1420 * at this point. Deallocate immediately. */
1421 free_sect_attrs(mod
->sect_attrs
);
1422 mod
->sect_attrs
= NULL
;
1427 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1430 struct module_notes_attrs
{
1431 struct kobject
*dir
;
1433 struct bin_attribute attrs
[0];
1436 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1437 struct bin_attribute
*bin_attr
,
1438 char *buf
, loff_t pos
, size_t count
)
1441 * The caller checked the pos and count against our size.
1443 memcpy(buf
, bin_attr
->private + pos
, count
);
1447 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1450 if (notes_attrs
->dir
) {
1452 sysfs_remove_bin_file(notes_attrs
->dir
,
1453 ¬es_attrs
->attrs
[i
]);
1454 kobject_put(notes_attrs
->dir
);
1459 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1461 unsigned int notes
, loaded
, i
;
1462 struct module_notes_attrs
*notes_attrs
;
1463 struct bin_attribute
*nattr
;
1465 /* failed to create section attributes, so can't create notes */
1466 if (!mod
->sect_attrs
)
1469 /* Count notes sections and allocate structures. */
1471 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1472 if (!sect_empty(&info
->sechdrs
[i
]) &&
1473 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1479 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1480 + notes
* sizeof(notes_attrs
->attrs
[0]),
1482 if (notes_attrs
== NULL
)
1485 notes_attrs
->notes
= notes
;
1486 nattr
= ¬es_attrs
->attrs
[0];
1487 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1488 if (sect_empty(&info
->sechdrs
[i
]))
1490 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1491 sysfs_bin_attr_init(nattr
);
1492 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1493 nattr
->attr
.mode
= S_IRUGO
;
1494 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1495 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1496 nattr
->read
= module_notes_read
;
1502 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1503 if (!notes_attrs
->dir
)
1506 for (i
= 0; i
< notes
; ++i
)
1507 if (sysfs_create_bin_file(notes_attrs
->dir
,
1508 ¬es_attrs
->attrs
[i
]))
1511 mod
->notes_attrs
= notes_attrs
;
1515 free_notes_attrs(notes_attrs
, i
);
1518 static void remove_notes_attrs(struct module
*mod
)
1520 if (mod
->notes_attrs
)
1521 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1526 static inline void add_sect_attrs(struct module
*mod
,
1527 const struct load_info
*info
)
1531 static inline void remove_sect_attrs(struct module
*mod
)
1535 static inline void add_notes_attrs(struct module
*mod
,
1536 const struct load_info
*info
)
1540 static inline void remove_notes_attrs(struct module
*mod
)
1543 #endif /* CONFIG_KALLSYMS */
1545 static void add_usage_links(struct module
*mod
)
1547 #ifdef CONFIG_MODULE_UNLOAD
1548 struct module_use
*use
;
1551 mutex_lock(&module_mutex
);
1552 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1553 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1554 &mod
->mkobj
.kobj
, mod
->name
);
1556 mutex_unlock(&module_mutex
);
1560 static void del_usage_links(struct module
*mod
)
1562 #ifdef CONFIG_MODULE_UNLOAD
1563 struct module_use
*use
;
1565 mutex_lock(&module_mutex
);
1566 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1567 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1568 mutex_unlock(&module_mutex
);
1572 static int module_add_modinfo_attrs(struct module
*mod
)
1574 struct module_attribute
*attr
;
1575 struct module_attribute
*temp_attr
;
1579 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1580 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1582 if (!mod
->modinfo_attrs
)
1585 temp_attr
= mod
->modinfo_attrs
;
1586 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1588 (attr
->test
&& attr
->test(mod
))) {
1589 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1590 sysfs_attr_init(&temp_attr
->attr
);
1591 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1598 static void module_remove_modinfo_attrs(struct module
*mod
)
1600 struct module_attribute
*attr
;
1603 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1604 /* pick a field to test for end of list */
1605 if (!attr
->attr
.name
)
1607 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1611 kfree(mod
->modinfo_attrs
);
1614 static int mod_sysfs_init(struct module
*mod
)
1617 struct kobject
*kobj
;
1619 if (!module_sysfs_initialized
) {
1620 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1626 kobj
= kset_find_obj(module_kset
, mod
->name
);
1628 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1634 mod
->mkobj
.mod
= mod
;
1636 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1637 mod
->mkobj
.kobj
.kset
= module_kset
;
1638 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1641 kobject_put(&mod
->mkobj
.kobj
);
1643 /* delay uevent until full sysfs population */
1648 static int mod_sysfs_setup(struct module
*mod
,
1649 const struct load_info
*info
,
1650 struct kernel_param
*kparam
,
1651 unsigned int num_params
)
1655 err
= mod_sysfs_init(mod
);
1659 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1660 if (!mod
->holders_dir
) {
1665 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1667 goto out_unreg_holders
;
1669 err
= module_add_modinfo_attrs(mod
);
1671 goto out_unreg_param
;
1673 add_usage_links(mod
);
1674 add_sect_attrs(mod
, info
);
1675 add_notes_attrs(mod
, info
);
1677 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1681 module_param_sysfs_remove(mod
);
1683 kobject_put(mod
->holders_dir
);
1685 kobject_put(&mod
->mkobj
.kobj
);
1690 static void mod_sysfs_fini(struct module
*mod
)
1692 remove_notes_attrs(mod
);
1693 remove_sect_attrs(mod
);
1694 kobject_put(&mod
->mkobj
.kobj
);
1697 #else /* !CONFIG_SYSFS */
1699 static int mod_sysfs_setup(struct module
*mod
,
1700 const struct load_info
*info
,
1701 struct kernel_param
*kparam
,
1702 unsigned int num_params
)
1707 static void mod_sysfs_fini(struct module
*mod
)
1711 static void module_remove_modinfo_attrs(struct module
*mod
)
1715 static void del_usage_links(struct module
*mod
)
1719 #endif /* CONFIG_SYSFS */
1721 static void mod_sysfs_teardown(struct module
*mod
)
1723 del_usage_links(mod
);
1724 module_remove_modinfo_attrs(mod
);
1725 module_param_sysfs_remove(mod
);
1726 kobject_put(mod
->mkobj
.drivers_dir
);
1727 kobject_put(mod
->holders_dir
);
1728 mod_sysfs_fini(mod
);
1732 * unlink the module with the whole machine is stopped with interrupts off
1733 * - this defends against kallsyms not taking locks
1735 static int __unlink_module(void *_mod
)
1737 struct module
*mod
= _mod
;
1738 list_del(&mod
->list
);
1739 module_bug_cleanup(mod
);
1743 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1745 * LKM RO/NX protection: protect module's text/ro-data
1746 * from modification and any data from execution.
1748 void set_page_attributes(void *start
, void *end
, int (*set
)(unsigned long start
, int num_pages
))
1750 unsigned long begin_pfn
= PFN_DOWN((unsigned long)start
);
1751 unsigned long end_pfn
= PFN_DOWN((unsigned long)end
);
1753 if (end_pfn
> begin_pfn
)
1754 set(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1757 static void set_section_ro_nx(void *base
,
1758 unsigned long text_size
,
1759 unsigned long ro_size
,
1760 unsigned long total_size
)
1762 /* begin and end PFNs of the current subsection */
1763 unsigned long begin_pfn
;
1764 unsigned long end_pfn
;
1767 * Set RO for module text and RO-data:
1768 * - Always protect first page.
1769 * - Do not protect last partial page.
1772 set_page_attributes(base
, base
+ ro_size
, set_memory_ro
);
1775 * Set NX permissions for module data:
1776 * - Do not protect first partial page.
1777 * - Always protect last page.
1779 if (total_size
> text_size
) {
1780 begin_pfn
= PFN_UP((unsigned long)base
+ text_size
);
1781 end_pfn
= PFN_UP((unsigned long)base
+ total_size
);
1782 if (end_pfn
> begin_pfn
)
1783 set_memory_nx(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1787 static void unset_module_core_ro_nx(struct module
*mod
)
1789 set_page_attributes(mod
->module_core
+ mod
->core_text_size
,
1790 mod
->module_core
+ mod
->core_size
,
1792 set_page_attributes(mod
->module_core
,
1793 mod
->module_core
+ mod
->core_ro_size
,
1797 static void unset_module_init_ro_nx(struct module
*mod
)
1799 set_page_attributes(mod
->module_init
+ mod
->init_text_size
,
1800 mod
->module_init
+ mod
->init_size
,
1802 set_page_attributes(mod
->module_init
,
1803 mod
->module_init
+ mod
->init_ro_size
,
1807 /* Iterate through all modules and set each module's text as RW */
1808 void set_all_modules_text_rw(void)
1812 mutex_lock(&module_mutex
);
1813 list_for_each_entry_rcu(mod
, &modules
, list
) {
1814 if (mod
->state
== MODULE_STATE_UNFORMED
)
1816 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1817 set_page_attributes(mod
->module_core
,
1818 mod
->module_core
+ mod
->core_text_size
,
1821 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1822 set_page_attributes(mod
->module_init
,
1823 mod
->module_init
+ mod
->init_text_size
,
1827 mutex_unlock(&module_mutex
);
1830 /* Iterate through all modules and set each module's text as RO */
1831 void set_all_modules_text_ro(void)
1835 mutex_lock(&module_mutex
);
1836 list_for_each_entry_rcu(mod
, &modules
, list
) {
1837 if (mod
->state
== MODULE_STATE_UNFORMED
)
1839 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1840 set_page_attributes(mod
->module_core
,
1841 mod
->module_core
+ mod
->core_text_size
,
1844 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1845 set_page_attributes(mod
->module_init
,
1846 mod
->module_init
+ mod
->init_text_size
,
1850 mutex_unlock(&module_mutex
);
1853 static inline void set_section_ro_nx(void *base
, unsigned long text_size
, unsigned long ro_size
, unsigned long total_size
) { }
1854 static void unset_module_core_ro_nx(struct module
*mod
) { }
1855 static void unset_module_init_ro_nx(struct module
*mod
) { }
1858 void __weak
module_free(struct module
*mod
, void *module_region
)
1860 vfree(module_region
);
1863 void __weak
module_arch_cleanup(struct module
*mod
)
1867 /* Free a module, remove from lists, etc. */
1868 static void free_module(struct module
*mod
)
1870 trace_module_free(mod
);
1872 mod_sysfs_teardown(mod
);
1874 /* We leave it in list to prevent duplicate loads, but make sure
1875 * that noone uses it while it's being deconstructed. */
1876 mutex_lock(&module_mutex
);
1877 mod
->state
= MODULE_STATE_UNFORMED
;
1878 mutex_unlock(&module_mutex
);
1880 /* Remove dynamic debug info */
1881 ddebug_remove_module(mod
->name
);
1883 /* Arch-specific cleanup. */
1884 module_arch_cleanup(mod
);
1886 /* Module unload stuff */
1887 module_unload_free(mod
);
1889 /* Free any allocated parameters. */
1890 destroy_params(mod
->kp
, mod
->num_kp
);
1892 /* Now we can delete it from the lists */
1893 mutex_lock(&module_mutex
);
1894 stop_machine(__unlink_module
, mod
, NULL
);
1895 mutex_unlock(&module_mutex
);
1897 /* This may be NULL, but that's OK */
1898 unset_module_init_ro_nx(mod
);
1899 module_free(mod
, mod
->module_init
);
1901 percpu_modfree(mod
);
1903 /* Free lock-classes: */
1904 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1906 /* Finally, free the core (containing the module structure) */
1907 unset_module_core_ro_nx(mod
);
1908 module_free(mod
, mod
->module_core
);
1911 update_protections(current
->mm
);
1915 void *__symbol_get(const char *symbol
)
1917 struct module
*owner
;
1918 const struct kernel_symbol
*sym
;
1921 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1922 if (sym
&& strong_try_module_get(owner
))
1926 return sym
? (void *)sym
->value
: NULL
;
1928 EXPORT_SYMBOL_GPL(__symbol_get
);
1931 * Ensure that an exported symbol [global namespace] does not already exist
1932 * in the kernel or in some other module's exported symbol table.
1934 * You must hold the module_mutex.
1936 static int verify_export_symbols(struct module
*mod
)
1939 struct module
*owner
;
1940 const struct kernel_symbol
*s
;
1942 const struct kernel_symbol
*sym
;
1945 { mod
->syms
, mod
->num_syms
},
1946 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1947 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1948 #ifdef CONFIG_UNUSED_SYMBOLS
1949 { mod
->unused_syms
, mod
->num_unused_syms
},
1950 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1954 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1955 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1956 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1958 "%s: exports duplicate symbol %s"
1960 mod
->name
, s
->name
, module_name(owner
));
1968 /* Change all symbols so that st_value encodes the pointer directly. */
1969 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
1971 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
1972 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
1973 unsigned long secbase
;
1976 const struct kernel_symbol
*ksym
;
1978 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
1979 const char *name
= info
->strtab
+ sym
[i
].st_name
;
1981 switch (sym
[i
].st_shndx
) {
1983 /* We compiled with -fno-common. These are not
1984 supposed to happen. */
1985 pr_debug("Common symbol: %s\n", name
);
1986 printk("%s: please compile with -fno-common\n",
1992 /* Don't need to do anything */
1993 pr_debug("Absolute symbol: 0x%08lx\n",
1994 (long)sym
[i
].st_value
);
1998 ksym
= resolve_symbol_wait(mod
, info
, name
);
1999 /* Ok if resolved. */
2000 if (ksym
&& !IS_ERR(ksym
)) {
2001 sym
[i
].st_value
= ksym
->value
;
2006 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
2009 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
2010 mod
->name
, name
, PTR_ERR(ksym
));
2011 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
2015 /* Divert to percpu allocation if a percpu var. */
2016 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
2017 secbase
= (unsigned long)mod_percpu(mod
);
2019 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
2020 sym
[i
].st_value
+= secbase
;
2028 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
2033 /* Now do relocations. */
2034 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2035 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2037 /* Not a valid relocation section? */
2038 if (infosec
>= info
->hdr
->e_shnum
)
2041 /* Don't bother with non-allocated sections */
2042 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2045 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2046 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2047 info
->index
.sym
, i
, mod
);
2048 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2049 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2050 info
->index
.sym
, i
, mod
);
2057 /* Additional bytes needed by arch in front of individual sections */
2058 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2059 unsigned int section
)
2061 /* default implementation just returns zero */
2065 /* Update size with this section: return offset. */
2066 static long get_offset(struct module
*mod
, unsigned int *size
,
2067 Elf_Shdr
*sechdr
, unsigned int section
)
2071 *size
+= arch_mod_section_prepend(mod
, section
);
2072 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2073 *size
= ret
+ sechdr
->sh_size
;
2077 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2078 might -- code, read-only data, read-write data, small data. Tally
2079 sizes, and place the offsets into sh_entsize fields: high bit means it
2081 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2083 static unsigned long const masks
[][2] = {
2084 /* NOTE: all executable code must be the first section
2085 * in this array; otherwise modify the text_size
2086 * finder in the two loops below */
2087 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2088 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2089 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2090 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2094 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2095 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2097 pr_debug("Core section allocation order:\n");
2098 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2099 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2100 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2101 const char *sname
= info
->secstrings
+ s
->sh_name
;
2103 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2104 || (s
->sh_flags
& masks
[m
][1])
2105 || s
->sh_entsize
!= ~0UL
2106 || strstarts(sname
, ".init"))
2108 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
2109 pr_debug("\t%s\n", sname
);
2112 case 0: /* executable */
2113 mod
->core_size
= debug_align(mod
->core_size
);
2114 mod
->core_text_size
= mod
->core_size
;
2116 case 1: /* RO: text and ro-data */
2117 mod
->core_size
= debug_align(mod
->core_size
);
2118 mod
->core_ro_size
= mod
->core_size
;
2120 case 3: /* whole core */
2121 mod
->core_size
= debug_align(mod
->core_size
);
2126 pr_debug("Init section allocation order:\n");
2127 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2128 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2129 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2130 const char *sname
= info
->secstrings
+ s
->sh_name
;
2132 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2133 || (s
->sh_flags
& masks
[m
][1])
2134 || s
->sh_entsize
!= ~0UL
2135 || !strstarts(sname
, ".init"))
2137 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
2138 | INIT_OFFSET_MASK
);
2139 pr_debug("\t%s\n", sname
);
2142 case 0: /* executable */
2143 mod
->init_size
= debug_align(mod
->init_size
);
2144 mod
->init_text_size
= mod
->init_size
;
2146 case 1: /* RO: text and ro-data */
2147 mod
->init_size
= debug_align(mod
->init_size
);
2148 mod
->init_ro_size
= mod
->init_size
;
2150 case 3: /* whole init */
2151 mod
->init_size
= debug_align(mod
->init_size
);
2157 static void set_license(struct module
*mod
, const char *license
)
2160 license
= "unspecified";
2162 if (!license_is_gpl_compatible(license
)) {
2163 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2164 printk(KERN_WARNING
"%s: module license '%s' taints "
2165 "kernel.\n", mod
->name
, license
);
2166 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2167 LOCKDEP_NOW_UNRELIABLE
);
2171 /* Parse tag=value strings from .modinfo section */
2172 static char *next_string(char *string
, unsigned long *secsize
)
2174 /* Skip non-zero chars */
2177 if ((*secsize
)-- <= 1)
2181 /* Skip any zero padding. */
2182 while (!string
[0]) {
2184 if ((*secsize
)-- <= 1)
2190 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2193 unsigned int taglen
= strlen(tag
);
2194 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2195 unsigned long size
= infosec
->sh_size
;
2197 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2198 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2199 return p
+ taglen
+ 1;
2204 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2206 struct module_attribute
*attr
;
2209 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2211 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2215 static void free_modinfo(struct module
*mod
)
2217 struct module_attribute
*attr
;
2220 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2226 #ifdef CONFIG_KALLSYMS
2228 /* lookup symbol in given range of kernel_symbols */
2229 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2230 const struct kernel_symbol
*start
,
2231 const struct kernel_symbol
*stop
)
2233 return bsearch(name
, start
, stop
- start
,
2234 sizeof(struct kernel_symbol
), cmp_name
);
2237 static int is_exported(const char *name
, unsigned long value
,
2238 const struct module
*mod
)
2240 const struct kernel_symbol
*ks
;
2242 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2244 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2245 return ks
!= NULL
&& ks
->value
== value
;
2249 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2251 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2253 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2254 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2259 if (sym
->st_shndx
== SHN_UNDEF
)
2261 if (sym
->st_shndx
== SHN_ABS
)
2263 if (sym
->st_shndx
>= SHN_LORESERVE
)
2265 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2267 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2268 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2269 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2271 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2276 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2277 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2282 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2289 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2292 const Elf_Shdr
*sec
;
2294 if (src
->st_shndx
== SHN_UNDEF
2295 || src
->st_shndx
>= shnum
2299 sec
= sechdrs
+ src
->st_shndx
;
2300 if (!(sec
->sh_flags
& SHF_ALLOC
)
2301 #ifndef CONFIG_KALLSYMS_ALL
2302 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2304 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2311 * We only allocate and copy the strings needed by the parts of symtab
2312 * we keep. This is simple, but has the effect of making multiple
2313 * copies of duplicates. We could be more sophisticated, see
2314 * linux-kernel thread starting with
2315 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2317 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2319 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2320 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2322 unsigned int i
, nsrc
, ndst
, strtab_size
= 0;
2324 /* Put symbol section at end of init part of module. */
2325 symsect
->sh_flags
|= SHF_ALLOC
;
2326 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
2327 info
->index
.sym
) | INIT_OFFSET_MASK
;
2328 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2330 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2331 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2333 /* Compute total space required for the core symbols' strtab. */
2334 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2336 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2337 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2342 /* Append room for core symbols at end of core part. */
2343 info
->symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
2344 info
->stroffs
= mod
->core_size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2345 mod
->core_size
+= strtab_size
;
2347 /* Put string table section at end of init part of module. */
2348 strsect
->sh_flags
|= SHF_ALLOC
;
2349 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
2350 info
->index
.str
) | INIT_OFFSET_MASK
;
2351 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2353 /* We'll tack temporary mod_kallsyms on the end. */
2354 mod
->init_size
= ALIGN(mod
->init_size
,
2355 __alignof__(struct mod_kallsyms
));
2356 info
->mod_kallsyms_init_off
= mod
->init_size
;
2357 mod
->init_size
+= sizeof(struct mod_kallsyms
);
2358 mod
->init_size
= debug_align(mod
->init_size
);
2362 * We use the full symtab and strtab which layout_symtab arranged to
2363 * be appended to the init section. Later we switch to the cut-down
2366 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2368 unsigned int i
, ndst
;
2372 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2374 /* Set up to point into init section. */
2375 mod
->kallsyms
= mod
->module_init
+ info
->mod_kallsyms_init_off
;
2377 mod
->kallsyms
->symtab
= (void *)symsec
->sh_addr
;
2378 mod
->kallsyms
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2379 /* Make sure we get permanent strtab: don't use info->strtab. */
2380 mod
->kallsyms
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2382 /* Set types up while we still have access to sections. */
2383 for (i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++)
2384 mod
->kallsyms
->symtab
[i
].st_info
2385 = elf_type(&mod
->kallsyms
->symtab
[i
], info
);
2387 /* Now populate the cut down core kallsyms for after init. */
2388 mod
->core_kallsyms
.symtab
= dst
= mod
->module_core
+ info
->symoffs
;
2389 mod
->core_kallsyms
.strtab
= s
= mod
->module_core
+ info
->stroffs
;
2390 src
= mod
->kallsyms
->symtab
;
2391 for (ndst
= i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++) {
2393 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2395 dst
[ndst
++].st_name
= s
- mod
->core_kallsyms
.strtab
;
2396 s
+= strlcpy(s
, &mod
->kallsyms
->strtab
[src
[i
].st_name
],
2400 mod
->core_kallsyms
.num_symtab
= ndst
;
2403 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2407 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2410 #endif /* CONFIG_KALLSYMS */
2412 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2416 #ifdef CONFIG_DYNAMIC_DEBUG
2417 if (ddebug_add_module(debug
, num
, debug
->modname
))
2418 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2423 static void dynamic_debug_remove(struct _ddebug
*debug
)
2426 ddebug_remove_module(debug
->modname
);
2429 void * __weak
module_alloc(unsigned long size
)
2431 return vmalloc_exec(size
);
2434 static void *module_alloc_update_bounds(unsigned long size
)
2436 void *ret
= module_alloc(size
);
2439 mutex_lock(&module_mutex
);
2440 /* Update module bounds. */
2441 if ((unsigned long)ret
< module_addr_min
)
2442 module_addr_min
= (unsigned long)ret
;
2443 if ((unsigned long)ret
+ size
> module_addr_max
)
2444 module_addr_max
= (unsigned long)ret
+ size
;
2445 mutex_unlock(&module_mutex
);
2450 #ifdef CONFIG_DEBUG_KMEMLEAK
2451 static void kmemleak_load_module(const struct module
*mod
,
2452 const struct load_info
*info
)
2456 /* only scan the sections containing data */
2457 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2459 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2460 /* Scan all writable sections that's not executable */
2461 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
2462 !(info
->sechdrs
[i
].sh_flags
& SHF_WRITE
) ||
2463 (info
->sechdrs
[i
].sh_flags
& SHF_EXECINSTR
))
2466 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2467 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2471 static inline void kmemleak_load_module(const struct module
*mod
,
2472 const struct load_info
*info
)
2477 #ifdef CONFIG_MODULE_SIG
2478 static int module_sig_check(struct load_info
*info
, int flags
)
2481 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2482 const void *mod
= info
->hdr
;
2485 * Require flags == 0, as a module with version information
2486 * removed is no longer the module that was signed
2489 info
->len
> markerlen
&&
2490 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2491 /* We truncate the module to discard the signature */
2492 info
->len
-= markerlen
;
2493 err
= mod_verify_sig(mod
, &info
->len
);
2497 info
->sig_ok
= true;
2501 /* Not having a signature is only an error if we're strict. */
2502 if (err
< 0 && fips_enabled
)
2503 panic("Module verification failed with error %d in FIPS mode\n",
2505 if (err
== -ENOKEY
&& !sig_enforce
)
2510 #else /* !CONFIG_MODULE_SIG */
2511 static int module_sig_check(struct load_info
*info
, int flags
)
2515 #endif /* !CONFIG_MODULE_SIG */
2517 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2518 static int elf_header_check(struct load_info
*info
)
2520 if (info
->len
< sizeof(*(info
->hdr
)))
2523 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2524 || info
->hdr
->e_type
!= ET_REL
2525 || !elf_check_arch(info
->hdr
)
2526 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2529 if (info
->hdr
->e_shoff
>= info
->len
2530 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2531 info
->len
- info
->hdr
->e_shoff
))
2537 /* Sets info->hdr and info->len. */
2538 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2539 struct load_info
*info
)
2544 if (info
->len
< sizeof(*(info
->hdr
)))
2547 err
= security_kernel_module_from_file(NULL
);
2551 /* Suck in entire file: we'll want most of it. */
2552 info
->hdr
= vmalloc(info
->len
);
2556 if (copy_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2564 /* Sets info->hdr and info->len. */
2565 static int copy_module_from_fd(int fd
, struct load_info
*info
)
2577 err
= security_kernel_module_from_file(file
);
2581 err
= vfs_getattr(&file
->f_path
, &stat
);
2585 if (stat
.size
> INT_MAX
) {
2590 /* Don't hand 0 to vmalloc, it whines. */
2591 if (stat
.size
== 0) {
2596 info
->hdr
= vmalloc(stat
.size
);
2603 while (pos
< stat
.size
) {
2604 bytes
= kernel_read(file
, pos
, (char *)(info
->hdr
) + pos
,
2622 static void free_copy(struct load_info
*info
)
2627 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2631 /* This should always be true, but let's be sure. */
2632 info
->sechdrs
[0].sh_addr
= 0;
2634 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2635 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2636 if (shdr
->sh_type
!= SHT_NOBITS
2637 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2638 printk(KERN_ERR
"Module len %lu truncated\n",
2643 /* Mark all sections sh_addr with their address in the
2645 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2647 #ifndef CONFIG_MODULE_UNLOAD
2648 /* Don't load .exit sections */
2649 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2650 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2654 /* Track but don't keep modinfo and version sections. */
2655 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2656 info
->index
.vers
= 0; /* Pretend no __versions section! */
2658 info
->index
.vers
= find_sec(info
, "__versions");
2659 info
->index
.info
= find_sec(info
, ".modinfo");
2660 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2661 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2666 * Set up our basic convenience variables (pointers to section headers,
2667 * search for module section index etc), and do some basic section
2670 * Return the temporary module pointer (we'll replace it with the final
2671 * one when we move the module sections around).
2673 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2679 /* Set up the convenience variables */
2680 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2681 info
->secstrings
= (void *)info
->hdr
2682 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2684 err
= rewrite_section_headers(info
, flags
);
2686 return ERR_PTR(err
);
2688 /* Find internal symbols and strings. */
2689 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2690 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2691 info
->index
.sym
= i
;
2692 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2693 info
->strtab
= (char *)info
->hdr
2694 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2699 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2700 if (!info
->index
.mod
) {
2701 printk(KERN_WARNING
"No module found in object\n");
2702 return ERR_PTR(-ENOEXEC
);
2704 /* This is temporary: point mod into copy of data. */
2705 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2707 if (info
->index
.sym
== 0) {
2708 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2710 return ERR_PTR(-ENOEXEC
);
2713 info
->index
.pcpu
= find_pcpusec(info
);
2715 /* Check module struct version now, before we try to use module. */
2716 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2717 return ERR_PTR(-ENOEXEC
);
2722 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2724 const char *modmagic
= get_modinfo(info
, "vermagic");
2727 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2730 /* This is allowed: modprobe --force will invalidate it. */
2732 err
= try_to_force_load(mod
, "bad vermagic");
2735 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2736 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2737 mod
->name
, modmagic
, vermagic
);
2741 if (!get_modinfo(info
, "intree"))
2742 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2744 if (get_modinfo(info
, "staging")) {
2745 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2746 printk(KERN_WARNING
"%s: module is from the staging directory,"
2747 " the quality is unknown, you have been warned.\n",
2751 /* Set up license info based on the info section */
2752 set_license(mod
, get_modinfo(info
, "license"));
2757 static void find_module_sections(struct module
*mod
, struct load_info
*info
)
2759 mod
->kp
= section_objs(info
, "__param",
2760 sizeof(*mod
->kp
), &mod
->num_kp
);
2761 mod
->syms
= section_objs(info
, "__ksymtab",
2762 sizeof(*mod
->syms
), &mod
->num_syms
);
2763 mod
->crcs
= section_addr(info
, "__kcrctab");
2764 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2765 sizeof(*mod
->gpl_syms
),
2766 &mod
->num_gpl_syms
);
2767 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2768 mod
->gpl_future_syms
= section_objs(info
,
2769 "__ksymtab_gpl_future",
2770 sizeof(*mod
->gpl_future_syms
),
2771 &mod
->num_gpl_future_syms
);
2772 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2774 #ifdef CONFIG_UNUSED_SYMBOLS
2775 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2776 sizeof(*mod
->unused_syms
),
2777 &mod
->num_unused_syms
);
2778 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2779 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2780 sizeof(*mod
->unused_gpl_syms
),
2781 &mod
->num_unused_gpl_syms
);
2782 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2784 #ifdef CONFIG_CONSTRUCTORS
2785 mod
->ctors
= section_objs(info
, ".ctors",
2786 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2789 #ifdef CONFIG_TRACEPOINTS
2790 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2791 sizeof(*mod
->tracepoints_ptrs
),
2792 &mod
->num_tracepoints
);
2794 #ifdef HAVE_JUMP_LABEL
2795 mod
->jump_entries
= section_objs(info
, "__jump_table",
2796 sizeof(*mod
->jump_entries
),
2797 &mod
->num_jump_entries
);
2799 #ifdef CONFIG_EVENT_TRACING
2800 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2801 sizeof(*mod
->trace_events
),
2802 &mod
->num_trace_events
);
2804 #ifdef CONFIG_TRACING
2805 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2806 sizeof(*mod
->trace_bprintk_fmt_start
),
2807 &mod
->num_trace_bprintk_fmt
);
2809 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2810 /* sechdrs[0].sh_size is always zero */
2811 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2812 sizeof(*mod
->ftrace_callsites
),
2813 &mod
->num_ftrace_callsites
);
2816 mod
->extable
= section_objs(info
, "__ex_table",
2817 sizeof(*mod
->extable
), &mod
->num_exentries
);
2819 if (section_addr(info
, "__obsparm"))
2820 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2823 info
->debug
= section_objs(info
, "__verbose",
2824 sizeof(*info
->debug
), &info
->num_debug
);
2827 static int move_module(struct module
*mod
, struct load_info
*info
)
2832 /* Do the allocs. */
2833 ptr
= module_alloc_update_bounds(mod
->core_size
);
2835 * The pointer to this block is stored in the module structure
2836 * which is inside the block. Just mark it as not being a
2839 kmemleak_not_leak(ptr
);
2843 memset(ptr
, 0, mod
->core_size
);
2844 mod
->module_core
= ptr
;
2846 if (mod
->init_size
) {
2847 ptr
= module_alloc_update_bounds(mod
->init_size
);
2849 * The pointer to this block is stored in the module structure
2850 * which is inside the block. This block doesn't need to be
2851 * scanned as it contains data and code that will be freed
2852 * after the module is initialized.
2854 kmemleak_ignore(ptr
);
2856 module_free(mod
, mod
->module_core
);
2859 memset(ptr
, 0, mod
->init_size
);
2860 mod
->module_init
= ptr
;
2862 mod
->module_init
= NULL
;
2864 /* Transfer each section which specifies SHF_ALLOC */
2865 pr_debug("final section addresses:\n");
2866 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
2868 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2870 if (!(shdr
->sh_flags
& SHF_ALLOC
))
2873 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
2874 dest
= mod
->module_init
2875 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
2877 dest
= mod
->module_core
+ shdr
->sh_entsize
;
2879 if (shdr
->sh_type
!= SHT_NOBITS
)
2880 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
2881 /* Update sh_addr to point to copy in image. */
2882 shdr
->sh_addr
= (unsigned long)dest
;
2883 pr_debug("\t0x%lx %s\n",
2884 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
2890 static int check_module_license_and_versions(struct module
*mod
)
2893 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2894 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2895 * using GPL-only symbols it needs.
2897 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2898 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
2900 /* driverloader was caught wrongly pretending to be under GPL */
2901 if (strcmp(mod
->name
, "driverloader") == 0)
2902 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2903 LOCKDEP_NOW_UNRELIABLE
);
2905 /* lve claims to be GPL but upstream won't provide source */
2906 if (strcmp(mod
->name
, "lve") == 0)
2907 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2908 LOCKDEP_NOW_UNRELIABLE
);
2910 #ifdef CONFIG_MODVERSIONS
2911 if ((mod
->num_syms
&& !mod
->crcs
)
2912 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2913 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2914 #ifdef CONFIG_UNUSED_SYMBOLS
2915 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2916 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2919 return try_to_force_load(mod
,
2920 "no versions for exported symbols");
2926 static void flush_module_icache(const struct module
*mod
)
2928 mm_segment_t old_fs
;
2930 /* flush the icache in correct context */
2935 * Flush the instruction cache, since we've played with text.
2936 * Do it before processing of module parameters, so the module
2937 * can provide parameter accessor functions of its own.
2939 if (mod
->module_init
)
2940 flush_icache_range((unsigned long)mod
->module_init
,
2941 (unsigned long)mod
->module_init
2943 flush_icache_range((unsigned long)mod
->module_core
,
2944 (unsigned long)mod
->module_core
+ mod
->core_size
);
2949 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
2957 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
2959 /* Module within temporary copy. */
2963 mod
= setup_load_info(info
, flags
);
2967 err
= check_modinfo(mod
, info
, flags
);
2969 return ERR_PTR(err
);
2971 /* Allow arches to frob section contents and sizes. */
2972 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
2973 info
->secstrings
, mod
);
2975 return ERR_PTR(err
);
2977 /* We will do a special allocation for per-cpu sections later. */
2978 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2980 /* Determine total sizes, and put offsets in sh_entsize. For now
2981 this is done generically; there doesn't appear to be any
2982 special cases for the architectures. */
2983 layout_sections(mod
, info
);
2984 layout_symtab(mod
, info
);
2986 /* Allocate and move to the final place */
2987 err
= move_module(mod
, info
);
2989 return ERR_PTR(err
);
2991 /* Module has been copied to its final place now: return it. */
2992 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2993 kmemleak_load_module(mod
, info
);
2997 static int alloc_module_percpu(struct module
*mod
, struct load_info
*info
)
2999 Elf_Shdr
*pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
3000 if (!pcpusec
->sh_size
)
3003 /* We have a special allocation for this section. */
3004 return percpu_modalloc(mod
, pcpusec
->sh_size
, pcpusec
->sh_addralign
);
3007 /* mod is no longer valid after this! */
3008 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
3010 percpu_modfree(mod
);
3011 module_free(mod
, mod
->module_init
);
3012 module_free(mod
, mod
->module_core
);
3015 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
3016 const Elf_Shdr
*sechdrs
,
3022 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
3024 /* Sort exception table now relocations are done. */
3025 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
3027 /* Copy relocated percpu area over. */
3028 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
3029 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
3031 /* Setup kallsyms-specific fields. */
3032 add_kallsyms(mod
, info
);
3034 /* Arch-specific module finalizing. */
3035 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3038 /* Is this module of this name done loading? No locks held. */
3039 static bool finished_loading(const char *name
)
3044 mutex_lock(&module_mutex
);
3045 mod
= find_module_all(name
, true);
3046 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3047 || mod
->state
== MODULE_STATE_GOING
;
3048 mutex_unlock(&module_mutex
);
3053 /* Call module constructors. */
3054 static void do_mod_ctors(struct module
*mod
)
3056 #ifdef CONFIG_CONSTRUCTORS
3059 for (i
= 0; i
< mod
->num_ctors
; i
++)
3064 /* This is where the real work happens */
3065 static int do_init_module(struct module
*mod
)
3070 * We want to find out whether @mod uses async during init. Clear
3071 * PF_USED_ASYNC. async_schedule*() will set it.
3073 current
->flags
&= ~PF_USED_ASYNC
;
3075 blocking_notifier_call_chain(&module_notify_list
,
3076 MODULE_STATE_COMING
, mod
);
3078 /* Set RO and NX regions for core */
3079 set_section_ro_nx(mod
->module_core
,
3080 mod
->core_text_size
,
3084 /* Set RO and NX regions for init */
3085 set_section_ro_nx(mod
->module_init
,
3086 mod
->init_text_size
,
3091 /* Start the module */
3092 if (mod
->init
!= NULL
)
3093 ret
= do_one_initcall(mod
->init
);
3095 /* Init routine failed: abort. Try to protect us from
3096 buggy refcounters. */
3097 mod
->state
= MODULE_STATE_GOING
;
3098 synchronize_sched();
3100 blocking_notifier_call_chain(&module_notify_list
,
3101 MODULE_STATE_GOING
, mod
);
3103 wake_up_all(&module_wq
);
3108 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3109 "%s: loading module anyway...\n",
3110 __func__
, mod
->name
, ret
,
3115 /* Now it's a first class citizen! */
3116 mod
->state
= MODULE_STATE_LIVE
;
3117 blocking_notifier_call_chain(&module_notify_list
,
3118 MODULE_STATE_LIVE
, mod
);
3121 * We need to finish all async code before the module init sequence
3122 * is done. This has potential to deadlock. For example, a newly
3123 * detected block device can trigger request_module() of the
3124 * default iosched from async probing task. Once userland helper
3125 * reaches here, async_synchronize_full() will wait on the async
3126 * task waiting on request_module() and deadlock.
3128 * This deadlock is avoided by perfomring async_synchronize_full()
3129 * iff module init queued any async jobs. This isn't a full
3130 * solution as it will deadlock the same if module loading from
3131 * async jobs nests more than once; however, due to the various
3132 * constraints, this hack seems to be the best option for now.
3133 * Please refer to the following thread for details.
3135 * http://thread.gmane.org/gmane.linux.kernel/1420814
3137 if (current
->flags
& PF_USED_ASYNC
)
3138 async_synchronize_full();
3140 mutex_lock(&module_mutex
);
3141 /* Drop initial reference. */
3143 trim_init_extable(mod
);
3144 #ifdef CONFIG_KALLSYMS
3145 /* Switch to core kallsyms now init is done: kallsyms may be walking! */
3146 rcu_assign_pointer(mod
->kallsyms
, &mod
->core_kallsyms
);
3148 unset_module_init_ro_nx(mod
);
3149 module_free(mod
, mod
->module_init
);
3150 mod
->module_init
= NULL
;
3152 mod
->init_ro_size
= 0;
3153 mod
->init_text_size
= 0;
3154 mutex_unlock(&module_mutex
);
3155 wake_up_all(&module_wq
);
3160 static int may_init_module(void)
3162 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3169 * We try to place it in the list now to make sure it's unique before
3170 * we dedicate too many resources. In particular, temporary percpu
3171 * memory exhaustion.
3173 static int add_unformed_module(struct module
*mod
)
3178 mod
->state
= MODULE_STATE_UNFORMED
;
3181 mutex_lock(&module_mutex
);
3182 if ((old
= find_module_all(mod
->name
, true)) != NULL
) {
3183 if (old
->state
== MODULE_STATE_COMING
3184 || old
->state
== MODULE_STATE_UNFORMED
) {
3185 /* Wait in case it fails to load. */
3186 mutex_unlock(&module_mutex
);
3187 err
= wait_event_interruptible(module_wq
,
3188 finished_loading(mod
->name
));
3196 list_add_rcu(&mod
->list
, &modules
);
3200 mutex_unlock(&module_mutex
);
3205 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3209 mutex_lock(&module_mutex
);
3211 /* Find duplicate symbols (must be called under lock). */
3212 err
= verify_export_symbols(mod
);
3216 /* This relies on module_mutex for list integrity. */
3217 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3219 /* Mark state as coming so strong_try_module_get() ignores us,
3220 * but kallsyms etc. can see us. */
3221 mod
->state
= MODULE_STATE_COMING
;
3224 mutex_unlock(&module_mutex
);
3228 /* Allocate and load the module: note that size of section 0 is always
3229 zero, and we rely on this for optional sections. */
3230 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3236 err
= module_sig_check(info
, flags
);
3240 err
= elf_header_check(info
);
3244 /* Figure out module layout, and allocate all the memory. */
3245 mod
= layout_and_allocate(info
, flags
);
3251 /* Reserve our place in the list. */
3252 err
= add_unformed_module(mod
);
3256 #ifdef CONFIG_MODULE_SIG
3257 mod
->sig_ok
= info
->sig_ok
;
3259 printk_once(KERN_NOTICE
3260 "%s: module verification failed: signature and/or"
3261 " required key missing - tainting kernel\n",
3263 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_STILL_OK
);
3267 /* To avoid stressing percpu allocator, do this once we're unique. */
3268 err
= alloc_module_percpu(mod
, info
);
3272 /* Now module is in final location, initialize linked lists, etc. */
3273 err
= module_unload_init(mod
);
3277 /* Now we've got everything in the final locations, we can
3278 * find optional sections. */
3279 find_module_sections(mod
, info
);
3281 err
= check_module_license_and_versions(mod
);
3285 /* Set up MODINFO_ATTR fields */
3286 setup_modinfo(mod
, info
);
3288 /* Fix up syms, so that st_value is a pointer to location. */
3289 err
= simplify_symbols(mod
, info
);
3293 err
= apply_relocations(mod
, info
);
3297 err
= post_relocation(mod
, info
);
3301 flush_module_icache(mod
);
3303 /* Now copy in args */
3304 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3305 if (IS_ERR(mod
->args
)) {
3306 err
= PTR_ERR(mod
->args
);
3307 goto free_arch_cleanup
;
3310 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3312 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3313 ftrace_module_init(mod
);
3315 /* Finally it's fully formed, ready to start executing. */
3316 err
= complete_formation(mod
, info
);
3318 goto ddebug_cleanup
;
3320 /* Module is ready to execute: parsing args may do that. */
3321 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3322 -32768, 32767, &ddebug_dyndbg_module_param_cb
);
3326 /* Link in to syfs. */
3327 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3331 /* Get rid of temporary copy. */
3335 trace_module_load(mod
);
3337 return do_init_module(mod
);
3340 /* module_bug_cleanup needs module_mutex protection */
3341 mutex_lock(&module_mutex
);
3342 module_bug_cleanup(mod
);
3343 mutex_unlock(&module_mutex
);
3345 dynamic_debug_remove(info
->debug
);
3346 synchronize_sched();
3349 module_arch_cleanup(mod
);
3353 module_unload_free(mod
);
3355 mutex_lock(&module_mutex
);
3356 /* Unlink carefully: kallsyms could be walking list. */
3357 list_del_rcu(&mod
->list
);
3358 wake_up_all(&module_wq
);
3359 mutex_unlock(&module_mutex
);
3361 module_deallocate(mod
, info
);
3367 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3368 unsigned long, len
, const char __user
*, uargs
)
3371 struct load_info info
= { };
3373 err
= may_init_module();
3377 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3380 err
= copy_module_from_user(umod
, len
, &info
);
3384 return load_module(&info
, uargs
, 0);
3387 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3390 struct load_info info
= { };
3392 err
= may_init_module();
3396 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3398 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3399 |MODULE_INIT_IGNORE_VERMAGIC
))
3402 err
= copy_module_from_fd(fd
, &info
);
3406 return load_module(&info
, uargs
, flags
);
3409 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3411 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3414 #ifdef CONFIG_KALLSYMS
3416 * This ignores the intensely annoying "mapping symbols" found
3417 * in ARM ELF files: $a, $t and $d.
3419 static inline int is_arm_mapping_symbol(const char *str
)
3421 return str
[0] == '$' && strchr("atd", str
[1])
3422 && (str
[2] == '\0' || str
[2] == '.');
3425 static const char *symname(struct mod_kallsyms
*kallsyms
, unsigned int symnum
)
3427 return kallsyms
->strtab
+ kallsyms
->symtab
[symnum
].st_name
;
3430 static const char *get_ksymbol(struct module
*mod
,
3432 unsigned long *size
,
3433 unsigned long *offset
)
3435 unsigned int i
, best
= 0;
3436 unsigned long nextval
;
3437 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3439 /* At worse, next value is at end of module */
3440 if (within_module_init(addr
, mod
))
3441 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
3443 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
3445 /* Scan for closest preceding symbol, and next symbol. (ELF
3446 starts real symbols at 1). */
3447 for (i
= 1; i
< kallsyms
->num_symtab
; i
++) {
3448 if (kallsyms
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3451 /* We ignore unnamed symbols: they're uninformative
3452 * and inserted at a whim. */
3453 if (*symname(kallsyms
, i
) == '\0'
3454 || is_arm_mapping_symbol(symname(kallsyms
, i
)))
3457 if (kallsyms
->symtab
[i
].st_value
<= addr
3458 && kallsyms
->symtab
[i
].st_value
> kallsyms
->symtab
[best
].st_value
)
3460 if (kallsyms
->symtab
[i
].st_value
> addr
3461 && kallsyms
->symtab
[i
].st_value
< nextval
)
3462 nextval
= kallsyms
->symtab
[i
].st_value
;
3469 *size
= nextval
- kallsyms
->symtab
[best
].st_value
;
3471 *offset
= addr
- kallsyms
->symtab
[best
].st_value
;
3472 return symname(kallsyms
, best
);
3475 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3476 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3477 const char *module_address_lookup(unsigned long addr
,
3478 unsigned long *size
,
3479 unsigned long *offset
,
3484 const char *ret
= NULL
;
3487 list_for_each_entry_rcu(mod
, &modules
, list
) {
3488 if (mod
->state
== MODULE_STATE_UNFORMED
)
3490 if (within_module_init(addr
, mod
) ||
3491 within_module_core(addr
, mod
)) {
3493 *modname
= mod
->name
;
3494 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3498 /* Make a copy in here where it's safe */
3500 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3507 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3512 list_for_each_entry_rcu(mod
, &modules
, list
) {
3513 if (mod
->state
== MODULE_STATE_UNFORMED
)
3515 if (within_module_init(addr
, mod
) ||
3516 within_module_core(addr
, mod
)) {
3519 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3522 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3532 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3533 unsigned long *offset
, char *modname
, char *name
)
3538 list_for_each_entry_rcu(mod
, &modules
, list
) {
3539 if (mod
->state
== MODULE_STATE_UNFORMED
)
3541 if (within_module_init(addr
, mod
) ||
3542 within_module_core(addr
, mod
)) {
3545 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3549 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3551 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3561 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3562 char *name
, char *module_name
, int *exported
)
3567 list_for_each_entry_rcu(mod
, &modules
, list
) {
3568 struct mod_kallsyms
*kallsyms
;
3570 if (mod
->state
== MODULE_STATE_UNFORMED
)
3572 kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3573 if (symnum
< kallsyms
->num_symtab
) {
3574 *value
= kallsyms
->symtab
[symnum
].st_value
;
3575 *type
= kallsyms
->symtab
[symnum
].st_info
;
3576 strlcpy(name
, symname(kallsyms
, symnum
), KSYM_NAME_LEN
);
3577 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3578 *exported
= is_exported(name
, *value
, mod
);
3582 symnum
-= kallsyms
->num_symtab
;
3588 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3591 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3593 for (i
= 0; i
< kallsyms
->num_symtab
; i
++)
3594 if (strcmp(name
, symname(kallsyms
, i
)) == 0 &&
3595 kallsyms
->symtab
[i
].st_info
!= 'U')
3596 return kallsyms
->symtab
[i
].st_value
;
3600 /* Look for this name: can be of form module:name. */
3601 unsigned long module_kallsyms_lookup_name(const char *name
)
3605 unsigned long ret
= 0;
3607 /* Don't lock: we're in enough trouble already. */
3609 if ((colon
= strchr(name
, ':')) != NULL
) {
3611 if ((mod
= find_module(name
)) != NULL
)
3612 ret
= mod_find_symname(mod
, colon
+1);
3615 list_for_each_entry_rcu(mod
, &modules
, list
) {
3616 if (mod
->state
== MODULE_STATE_UNFORMED
)
3618 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3626 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3627 struct module
*, unsigned long),
3634 list_for_each_entry(mod
, &modules
, list
) {
3635 /* We hold module_mutex: no need for rcu_dereference_sched */
3636 struct mod_kallsyms
*kallsyms
= mod
->kallsyms
;
3638 if (mod
->state
== MODULE_STATE_UNFORMED
)
3640 for (i
= 0; i
< kallsyms
->num_symtab
; i
++) {
3641 ret
= fn(data
, symname(kallsyms
, i
),
3642 mod
, kallsyms
->symtab
[i
].st_value
);
3649 #endif /* CONFIG_KALLSYMS */
3651 static char *module_flags(struct module
*mod
, char *buf
)
3655 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
3657 mod
->state
== MODULE_STATE_GOING
||
3658 mod
->state
== MODULE_STATE_COMING
) {
3660 bx
+= module_flags_taint(mod
, buf
+ bx
);
3661 /* Show a - for module-is-being-unloaded */
3662 if (mod
->state
== MODULE_STATE_GOING
)
3664 /* Show a + for module-is-being-loaded */
3665 if (mod
->state
== MODULE_STATE_COMING
)
3674 #ifdef CONFIG_PROC_FS
3675 /* Called by the /proc file system to return a list of modules. */
3676 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3678 mutex_lock(&module_mutex
);
3679 return seq_list_start(&modules
, *pos
);
3682 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3684 return seq_list_next(p
, &modules
, pos
);
3687 static void m_stop(struct seq_file
*m
, void *p
)
3689 mutex_unlock(&module_mutex
);
3692 static int m_show(struct seq_file
*m
, void *p
)
3694 struct module
*mod
= list_entry(p
, struct module
, list
);
3697 /* We always ignore unformed modules. */
3698 if (mod
->state
== MODULE_STATE_UNFORMED
)
3701 seq_printf(m
, "%s %u",
3702 mod
->name
, mod
->init_size
+ mod
->core_size
);
3703 print_unload_info(m
, mod
);
3705 /* Informative for users. */
3706 seq_printf(m
, " %s",
3707 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3708 mod
->state
== MODULE_STATE_COMING
? "Loading":
3710 /* Used by oprofile and other similar tools. */
3711 seq_printf(m
, " 0x%pK", mod
->module_core
);
3715 seq_printf(m
, " %s", module_flags(mod
, buf
));
3717 seq_printf(m
, "\n");
3721 /* Format: modulename size refcount deps address
3723 Where refcount is a number or -, and deps is a comma-separated list
3726 static const struct seq_operations modules_op
= {
3733 static int modules_open(struct inode
*inode
, struct file
*file
)
3735 return seq_open(file
, &modules_op
);
3738 static const struct file_operations proc_modules_operations
= {
3739 .open
= modules_open
,
3741 .llseek
= seq_lseek
,
3742 .release
= seq_release
,
3745 static int __init
proc_modules_init(void)
3747 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3750 module_init(proc_modules_init
);
3753 /* Given an address, look for it in the module exception tables. */
3754 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3756 const struct exception_table_entry
*e
= NULL
;
3760 list_for_each_entry_rcu(mod
, &modules
, list
) {
3761 if (mod
->state
== MODULE_STATE_UNFORMED
)
3763 if (mod
->num_exentries
== 0)
3766 e
= search_extable(mod
->extable
,
3767 mod
->extable
+ mod
->num_exentries
- 1,
3774 /* Now, if we found one, we are running inside it now, hence
3775 we cannot unload the module, hence no refcnt needed. */
3780 * is_module_address - is this address inside a module?
3781 * @addr: the address to check.
3783 * See is_module_text_address() if you simply want to see if the address
3784 * is code (not data).
3786 bool is_module_address(unsigned long addr
)
3791 ret
= __module_address(addr
) != NULL
;
3798 * __module_address - get the module which contains an address.
3799 * @addr: the address.
3801 * Must be called with preempt disabled or module mutex held so that
3802 * module doesn't get freed during this.
3804 struct module
*__module_address(unsigned long addr
)
3808 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3811 list_for_each_entry_rcu(mod
, &modules
, list
) {
3812 if (mod
->state
== MODULE_STATE_UNFORMED
)
3814 if (within_module_core(addr
, mod
)
3815 || within_module_init(addr
, mod
))
3820 EXPORT_SYMBOL_GPL(__module_address
);
3823 * is_module_text_address - is this address inside module code?
3824 * @addr: the address to check.
3826 * See is_module_address() if you simply want to see if the address is
3827 * anywhere in a module. See kernel_text_address() for testing if an
3828 * address corresponds to kernel or module code.
3830 bool is_module_text_address(unsigned long addr
)
3835 ret
= __module_text_address(addr
) != NULL
;
3842 * __module_text_address - get the module whose code contains an address.
3843 * @addr: the address.
3845 * Must be called with preempt disabled or module mutex held so that
3846 * module doesn't get freed during this.
3848 struct module
*__module_text_address(unsigned long addr
)
3850 struct module
*mod
= __module_address(addr
);
3852 /* Make sure it's within the text section. */
3853 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3854 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3859 EXPORT_SYMBOL_GPL(__module_text_address
);
3861 /* Don't grab lock, we're oopsing. */
3862 void print_modules(void)
3867 printk(KERN_DEFAULT
"Modules linked in:");
3868 /* Most callers should already have preempt disabled, but make sure */
3870 list_for_each_entry_rcu(mod
, &modules
, list
) {
3871 if (mod
->state
== MODULE_STATE_UNFORMED
)
3873 printk(" %s %p %s", mod
->name
, mod
->module_core
, module_flags(mod
, buf
));
3876 if (last_unloaded_module
[0])
3877 printk(" [last unloaded: %s]", last_unloaded_module
);
3881 #ifdef CONFIG_MODVERSIONS
3882 /* Generate the signature for all relevant module structures here.
3883 * If these change, we don't want to try to parse the module. */
3884 void module_layout(struct module
*mod
,
3885 struct modversion_info
*ver
,
3886 struct kernel_param
*kp
,
3887 struct kernel_symbol
*ks
,
3888 struct tracepoint
* const *tp
)
3891 EXPORT_SYMBOL(module_layout
);