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 .flags
= KERNEL_PARAM_FL_NOARG
,
140 .set
= param_set_bool_enable_only
,
141 .get
= param_get_bool
,
143 #define param_check_bool_enable_only param_check_bool
145 module_param(sig_enforce
, bool_enable_only
, 0644);
146 #endif /* !CONFIG_MODULE_SIG_FORCE */
147 #endif /* CONFIG_MODULE_SIG */
149 /* Block module loading/unloading? */
150 int modules_disabled
= 0;
151 core_param(nomodule
, modules_disabled
, bint
, 0);
153 /* Waiting for a module to finish initializing? */
154 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
156 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
158 /* Bounds of module allocation, for speeding __module_address.
159 * Protected by module_mutex. */
160 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
162 int register_module_notifier(struct notifier_block
* nb
)
164 return blocking_notifier_chain_register(&module_notify_list
, nb
);
166 EXPORT_SYMBOL(register_module_notifier
);
168 int unregister_module_notifier(struct notifier_block
* nb
)
170 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
172 EXPORT_SYMBOL(unregister_module_notifier
);
178 char *secstrings
, *strtab
;
179 unsigned long symoffs
, stroffs
;
180 struct _ddebug
*debug
;
181 unsigned int num_debug
;
184 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
188 /* We require a truly strong try_module_get(): 0 means failure due to
189 ongoing or failed initialization etc. */
190 static inline int strong_try_module_get(struct module
*mod
)
192 BUG_ON(mod
&& mod
->state
== MODULE_STATE_UNFORMED
);
193 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
195 if (try_module_get(mod
))
201 static inline void add_taint_module(struct module
*mod
, unsigned flag
,
202 enum lockdep_ok lockdep_ok
)
204 add_taint(flag
, lockdep_ok
);
205 mod
->taints
|= (1U << flag
);
209 * A thread that wants to hold a reference to a module only while it
210 * is running can call this to safely exit. nfsd and lockd use this.
212 void __module_put_and_exit(struct module
*mod
, long code
)
217 EXPORT_SYMBOL(__module_put_and_exit
);
219 /* Find a module section: 0 means not found. */
220 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
224 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
225 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
226 /* Alloc bit cleared means "ignore it." */
227 if ((shdr
->sh_flags
& SHF_ALLOC
)
228 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
234 /* Find a module section, or NULL. */
235 static void *section_addr(const struct load_info
*info
, const char *name
)
237 /* Section 0 has sh_addr 0. */
238 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
241 /* Find a module section, or NULL. Fill in number of "objects" in section. */
242 static void *section_objs(const struct load_info
*info
,
247 unsigned int sec
= find_sec(info
, name
);
249 /* Section 0 has sh_addr 0 and sh_size 0. */
250 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
251 return (void *)info
->sechdrs
[sec
].sh_addr
;
254 /* Provided by the linker */
255 extern const struct kernel_symbol __start___ksymtab
[];
256 extern const struct kernel_symbol __stop___ksymtab
[];
257 extern const struct kernel_symbol __start___ksymtab_gpl
[];
258 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
259 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
260 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
261 extern const unsigned long __start___kcrctab
[];
262 extern const unsigned long __start___kcrctab_gpl
[];
263 extern const unsigned long __start___kcrctab_gpl_future
[];
264 #ifdef CONFIG_UNUSED_SYMBOLS
265 extern const struct kernel_symbol __start___ksymtab_unused
[];
266 extern const struct kernel_symbol __stop___ksymtab_unused
[];
267 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
268 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
269 extern const unsigned long __start___kcrctab_unused
[];
270 extern const unsigned long __start___kcrctab_unused_gpl
[];
273 #ifndef CONFIG_MODVERSIONS
274 #define symversion(base, idx) NULL
276 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
279 static bool each_symbol_in_section(const struct symsearch
*arr
,
280 unsigned int arrsize
,
281 struct module
*owner
,
282 bool (*fn
)(const struct symsearch
*syms
,
283 struct module
*owner
,
289 for (j
= 0; j
< arrsize
; j
++) {
290 if (fn(&arr
[j
], owner
, data
))
297 /* Returns true as soon as fn returns true, otherwise false. */
298 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
299 struct module
*owner
,
304 static const struct symsearch arr
[] = {
305 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
306 NOT_GPL_ONLY
, false },
307 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
308 __start___kcrctab_gpl
,
310 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
311 __start___kcrctab_gpl_future
,
312 WILL_BE_GPL_ONLY
, false },
313 #ifdef CONFIG_UNUSED_SYMBOLS
314 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
315 __start___kcrctab_unused
,
316 NOT_GPL_ONLY
, true },
317 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
318 __start___kcrctab_unused_gpl
,
323 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
326 list_for_each_entry_rcu(mod
, &modules
, list
) {
327 struct symsearch arr
[] = {
328 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
329 NOT_GPL_ONLY
, false },
330 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
333 { mod
->gpl_future_syms
,
334 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
335 mod
->gpl_future_crcs
,
336 WILL_BE_GPL_ONLY
, false },
337 #ifdef CONFIG_UNUSED_SYMBOLS
339 mod
->unused_syms
+ mod
->num_unused_syms
,
341 NOT_GPL_ONLY
, true },
342 { mod
->unused_gpl_syms
,
343 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
344 mod
->unused_gpl_crcs
,
349 if (mod
->state
== MODULE_STATE_UNFORMED
)
352 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
357 EXPORT_SYMBOL_GPL(each_symbol_section
);
359 struct find_symbol_arg
{
366 struct module
*owner
;
367 const unsigned long *crc
;
368 const struct kernel_symbol
*sym
;
371 static bool check_symbol(const struct symsearch
*syms
,
372 struct module
*owner
,
373 unsigned int symnum
, void *data
)
375 struct find_symbol_arg
*fsa
= data
;
378 if (syms
->licence
== GPL_ONLY
)
380 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
381 pr_warn("Symbol %s is being used by a non-GPL module, "
382 "which will not be allowed in the future\n",
387 #ifdef CONFIG_UNUSED_SYMBOLS
388 if (syms
->unused
&& fsa
->warn
) {
389 pr_warn("Symbol %s is marked as UNUSED, however this module is "
390 "using it.\n", fsa
->name
);
391 pr_warn("This symbol will go away in the future.\n");
392 pr_warn("Please evalute if this is the right api to use and if "
393 "it really is, submit a report the linux kernel "
394 "mailinglist together with submitting your code for "
400 fsa
->crc
= symversion(syms
->crcs
, symnum
);
401 fsa
->sym
= &syms
->start
[symnum
];
405 static int cmp_name(const void *va
, const void *vb
)
408 const struct kernel_symbol
*b
;
410 return strcmp(a
, b
->name
);
413 static bool find_symbol_in_section(const struct symsearch
*syms
,
414 struct module
*owner
,
417 struct find_symbol_arg
*fsa
= data
;
418 struct kernel_symbol
*sym
;
420 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
421 sizeof(struct kernel_symbol
), cmp_name
);
423 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
429 /* Find a symbol and return it, along with, (optional) crc and
430 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
431 const struct kernel_symbol
*find_symbol(const char *name
,
432 struct module
**owner
,
433 const unsigned long **crc
,
437 struct find_symbol_arg fsa
;
443 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
451 pr_debug("Failed to find symbol %s\n", name
);
454 EXPORT_SYMBOL_GPL(find_symbol
);
456 /* Search for module by name: must hold module_mutex. */
457 static struct module
*find_module_all(const char *name
, size_t len
,
462 list_for_each_entry(mod
, &modules
, list
) {
463 if (!even_unformed
&& mod
->state
== MODULE_STATE_UNFORMED
)
465 if (strlen(mod
->name
) == len
&& !memcmp(mod
->name
, name
, len
))
471 struct module
*find_module(const char *name
)
473 return find_module_all(name
, strlen(name
), false);
475 EXPORT_SYMBOL_GPL(find_module
);
479 static inline void __percpu
*mod_percpu(struct module
*mod
)
484 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
486 Elf_Shdr
*pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
487 unsigned long align
= pcpusec
->sh_addralign
;
489 if (!pcpusec
->sh_size
)
492 if (align
> PAGE_SIZE
) {
493 pr_warn("%s: per-cpu alignment %li > %li\n",
494 mod
->name
, align
, PAGE_SIZE
);
498 mod
->percpu
= __alloc_reserved_percpu(pcpusec
->sh_size
, align
);
500 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
501 mod
->name
, (unsigned long)pcpusec
->sh_size
);
504 mod
->percpu_size
= pcpusec
->sh_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 int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
571 /* UP modules shouldn't have this section: ENOMEM isn't quite right */
572 if (info
->sechdrs
[info
->index
.pcpu
].sh_size
!= 0)
576 static inline void percpu_modfree(struct module
*mod
)
579 static unsigned int find_pcpusec(struct load_info
*info
)
583 static inline void percpu_modcopy(struct module
*mod
,
584 const void *from
, unsigned long size
)
586 /* pcpusec should be 0, and size of that section should be 0. */
589 bool is_module_percpu_address(unsigned long addr
)
594 #endif /* CONFIG_SMP */
596 #define MODINFO_ATTR(field) \
597 static void setup_modinfo_##field(struct module *mod, const char *s) \
599 mod->field = kstrdup(s, GFP_KERNEL); \
601 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
602 struct module_kobject *mk, char *buffer) \
604 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
606 static int modinfo_##field##_exists(struct module *mod) \
608 return mod->field != NULL; \
610 static void free_modinfo_##field(struct module *mod) \
615 static struct module_attribute modinfo_##field = { \
616 .attr = { .name = __stringify(field), .mode = 0444 }, \
617 .show = show_modinfo_##field, \
618 .setup = setup_modinfo_##field, \
619 .test = modinfo_##field##_exists, \
620 .free = free_modinfo_##field, \
623 MODINFO_ATTR(version
);
624 MODINFO_ATTR(srcversion
);
626 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
628 #ifdef CONFIG_MODULE_UNLOAD
630 EXPORT_TRACEPOINT_SYMBOL(module_get
);
632 /* Init the unload section of the module. */
633 static int module_unload_init(struct module
*mod
)
635 mod
->refptr
= alloc_percpu(struct module_ref
);
639 INIT_LIST_HEAD(&mod
->source_list
);
640 INIT_LIST_HEAD(&mod
->target_list
);
642 /* Hold reference count during initialization. */
643 __this_cpu_write(mod
->refptr
->incs
, 1);
644 /* Backwards compatibility macros put refcount during init. */
645 mod
->waiter
= current
;
650 /* Does a already use b? */
651 static int already_uses(struct module
*a
, struct module
*b
)
653 struct module_use
*use
;
655 list_for_each_entry(use
, &b
->source_list
, source_list
) {
656 if (use
->source
== a
) {
657 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
661 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
667 * - we add 'a' as a "source", 'b' as a "target" of module use
668 * - the module_use is added to the list of 'b' sources (so
669 * 'b' can walk the list to see who sourced them), and of 'a'
670 * targets (so 'a' can see what modules it targets).
672 static int add_module_usage(struct module
*a
, struct module
*b
)
674 struct module_use
*use
;
676 pr_debug("Allocating new usage for %s.\n", a
->name
);
677 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
679 pr_warn("%s: out of memory loading\n", a
->name
);
685 list_add(&use
->source_list
, &b
->source_list
);
686 list_add(&use
->target_list
, &a
->target_list
);
690 /* Module a uses b: caller needs module_mutex() */
691 int ref_module(struct module
*a
, struct module
*b
)
695 if (b
== NULL
|| already_uses(a
, b
))
698 /* If module isn't available, we fail. */
699 err
= strong_try_module_get(b
);
703 err
= add_module_usage(a
, b
);
710 EXPORT_SYMBOL_GPL(ref_module
);
712 /* Clear the unload stuff of the module. */
713 static void module_unload_free(struct module
*mod
)
715 struct module_use
*use
, *tmp
;
717 mutex_lock(&module_mutex
);
718 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
719 struct module
*i
= use
->target
;
720 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
722 list_del(&use
->source_list
);
723 list_del(&use
->target_list
);
726 mutex_unlock(&module_mutex
);
728 free_percpu(mod
->refptr
);
731 #ifdef CONFIG_MODULE_FORCE_UNLOAD
732 static inline int try_force_unload(unsigned int flags
)
734 int ret
= (flags
& O_TRUNC
);
736 add_taint(TAINT_FORCED_RMMOD
, LOCKDEP_NOW_UNRELIABLE
);
740 static inline int try_force_unload(unsigned int flags
)
744 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
753 /* Whole machine is stopped with interrupts off when this runs. */
754 static int __try_stop_module(void *_sref
)
756 struct stopref
*sref
= _sref
;
758 /* If it's not unused, quit unless we're forcing. */
759 if (module_refcount(sref
->mod
) != 0) {
760 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
764 /* Mark it as dying. */
765 sref
->mod
->state
= MODULE_STATE_GOING
;
769 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
771 if (flags
& O_NONBLOCK
) {
772 struct stopref sref
= { mod
, flags
, forced
};
774 return stop_machine(__try_stop_module
, &sref
, NULL
);
776 /* We don't need to stop the machine for this. */
777 mod
->state
= MODULE_STATE_GOING
;
783 unsigned long module_refcount(struct module
*mod
)
785 unsigned long incs
= 0, decs
= 0;
788 for_each_possible_cpu(cpu
)
789 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
791 * ensure the incs are added up after the decs.
792 * module_put ensures incs are visible before decs with smp_wmb.
794 * This 2-count scheme avoids the situation where the refcount
795 * for CPU0 is read, then CPU0 increments the module refcount,
796 * then CPU1 drops that refcount, then the refcount for CPU1 is
797 * read. We would record a decrement but not its corresponding
798 * increment so we would see a low count (disaster).
800 * Rare situation? But module_refcount can be preempted, and we
801 * might be tallying up 4096+ CPUs. So it is not impossible.
804 for_each_possible_cpu(cpu
)
805 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
808 EXPORT_SYMBOL(module_refcount
);
810 /* This exists whether we can unload or not */
811 static void free_module(struct module
*mod
);
813 static void wait_for_zero_refcount(struct module
*mod
)
815 /* Since we might sleep for some time, release the mutex first */
816 mutex_unlock(&module_mutex
);
818 pr_debug("Looking at refcount...\n");
819 set_current_state(TASK_UNINTERRUPTIBLE
);
820 if (module_refcount(mod
) == 0)
824 current
->state
= TASK_RUNNING
;
825 mutex_lock(&module_mutex
);
828 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
832 char name
[MODULE_NAME_LEN
];
835 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
838 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
840 name
[MODULE_NAME_LEN
-1] = '\0';
842 if (mutex_lock_interruptible(&module_mutex
) != 0)
845 mod
= find_module(name
);
851 if (!list_empty(&mod
->source_list
)) {
852 /* Other modules depend on us: get rid of them first. */
857 /* Doing init or already dying? */
858 if (mod
->state
!= MODULE_STATE_LIVE
) {
859 /* FIXME: if (force), slam module count and wake up
861 pr_debug("%s already dying\n", mod
->name
);
866 /* If it has an init func, it must have an exit func to unload */
867 if (mod
->init
&& !mod
->exit
) {
868 forced
= try_force_unload(flags
);
870 /* This module can't be removed */
876 /* Set this up before setting mod->state */
877 mod
->waiter
= current
;
879 /* Stop the machine so refcounts can't move and disable module. */
880 ret
= try_stop_module(mod
, flags
, &forced
);
884 /* Never wait if forced. */
885 if (!forced
&& module_refcount(mod
) != 0)
886 wait_for_zero_refcount(mod
);
888 mutex_unlock(&module_mutex
);
889 /* Final destruction now no one is using it. */
890 if (mod
->exit
!= NULL
)
892 blocking_notifier_call_chain(&module_notify_list
,
893 MODULE_STATE_GOING
, mod
);
894 async_synchronize_full();
896 /* Store the name of the last unloaded module for diagnostic purposes */
897 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
902 mutex_unlock(&module_mutex
);
906 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
908 struct module_use
*use
;
909 int printed_something
= 0;
911 seq_printf(m
, " %lu ", module_refcount(mod
));
913 /* Always include a trailing , so userspace can differentiate
914 between this and the old multi-field proc format. */
915 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
916 printed_something
= 1;
917 seq_printf(m
, "%s,", use
->source
->name
);
920 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
921 printed_something
= 1;
922 seq_printf(m
, "[permanent],");
925 if (!printed_something
)
929 void __symbol_put(const char *symbol
)
931 struct module
*owner
;
934 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
939 EXPORT_SYMBOL(__symbol_put
);
941 /* Note this assumes addr is a function, which it currently always is. */
942 void symbol_put_addr(void *addr
)
944 struct module
*modaddr
;
945 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
947 if (core_kernel_text(a
))
950 /* module_text_address is safe here: we're supposed to have reference
951 * to module from symbol_get, so it can't go away. */
952 modaddr
= __module_text_address(a
);
956 EXPORT_SYMBOL_GPL(symbol_put_addr
);
958 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
959 struct module_kobject
*mk
, char *buffer
)
961 return sprintf(buffer
, "%lu\n", module_refcount(mk
->mod
));
964 static struct module_attribute modinfo_refcnt
=
965 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
967 void __module_get(struct module
*module
)
971 __this_cpu_inc(module
->refptr
->incs
);
972 trace_module_get(module
, _RET_IP_
);
976 EXPORT_SYMBOL(__module_get
);
978 bool try_module_get(struct module
*module
)
985 if (likely(module_is_live(module
))) {
986 __this_cpu_inc(module
->refptr
->incs
);
987 trace_module_get(module
, _RET_IP_
);
995 EXPORT_SYMBOL(try_module_get
);
997 void module_put(struct module
*module
)
1001 smp_wmb(); /* see comment in module_refcount */
1002 __this_cpu_inc(module
->refptr
->decs
);
1004 trace_module_put(module
, _RET_IP_
);
1005 /* Maybe they're waiting for us to drop reference? */
1006 if (unlikely(!module_is_live(module
)))
1007 wake_up_process(module
->waiter
);
1011 EXPORT_SYMBOL(module_put
);
1013 #else /* !CONFIG_MODULE_UNLOAD */
1014 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1016 /* We don't know the usage count, or what modules are using. */
1017 seq_printf(m
, " - -");
1020 static inline void module_unload_free(struct module
*mod
)
1024 int ref_module(struct module
*a
, struct module
*b
)
1026 return strong_try_module_get(b
);
1028 EXPORT_SYMBOL_GPL(ref_module
);
1030 static inline int module_unload_init(struct module
*mod
)
1034 #endif /* CONFIG_MODULE_UNLOAD */
1036 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1040 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1042 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1044 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1046 if (mod
->taints
& (1 << TAINT_CRAP
))
1049 * TAINT_FORCED_RMMOD: could be added.
1050 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1056 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1057 struct module_kobject
*mk
, char *buffer
)
1059 const char *state
= "unknown";
1061 switch (mk
->mod
->state
) {
1062 case MODULE_STATE_LIVE
:
1065 case MODULE_STATE_COMING
:
1068 case MODULE_STATE_GOING
:
1074 return sprintf(buffer
, "%s\n", state
);
1077 static struct module_attribute modinfo_initstate
=
1078 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1080 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1081 struct module_kobject
*mk
,
1082 const char *buffer
, size_t count
)
1084 enum kobject_action action
;
1086 if (kobject_action_type(buffer
, count
, &action
) == 0)
1087 kobject_uevent(&mk
->kobj
, action
);
1091 struct module_attribute module_uevent
=
1092 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1094 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1095 struct module_kobject
*mk
, char *buffer
)
1097 return sprintf(buffer
, "%u\n", mk
->mod
->core_size
);
1100 static struct module_attribute modinfo_coresize
=
1101 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1103 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1104 struct module_kobject
*mk
, char *buffer
)
1106 return sprintf(buffer
, "%u\n", mk
->mod
->init_size
);
1109 static struct module_attribute modinfo_initsize
=
1110 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1112 static ssize_t
show_taint(struct module_attribute
*mattr
,
1113 struct module_kobject
*mk
, char *buffer
)
1117 l
= module_flags_taint(mk
->mod
, buffer
);
1122 static struct module_attribute modinfo_taint
=
1123 __ATTR(taint
, 0444, show_taint
, NULL
);
1125 static struct module_attribute
*modinfo_attrs
[] = {
1128 &modinfo_srcversion
,
1133 #ifdef CONFIG_MODULE_UNLOAD
1139 static const char vermagic
[] = VERMAGIC_STRING
;
1141 static int try_to_force_load(struct module
*mod
, const char *reason
)
1143 #ifdef CONFIG_MODULE_FORCE_LOAD
1144 if (!test_taint(TAINT_FORCED_MODULE
))
1145 pr_warn("%s: %s: kernel tainted.\n", mod
->name
, reason
);
1146 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
1153 #ifdef CONFIG_MODVERSIONS
1154 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1155 static unsigned long maybe_relocated(unsigned long crc
,
1156 const struct module
*crc_owner
)
1158 #ifdef ARCH_RELOCATES_KCRCTAB
1159 if (crc_owner
== NULL
)
1160 return crc
- (unsigned long)reloc_start
;
1165 static int check_version(Elf_Shdr
*sechdrs
,
1166 unsigned int versindex
,
1167 const char *symname
,
1169 const unsigned long *crc
,
1170 const struct module
*crc_owner
)
1172 unsigned int i
, num_versions
;
1173 struct modversion_info
*versions
;
1175 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1179 /* No versions at all? modprobe --force does this. */
1181 return try_to_force_load(mod
, symname
) == 0;
1183 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1184 num_versions
= sechdrs
[versindex
].sh_size
1185 / sizeof(struct modversion_info
);
1187 for (i
= 0; i
< num_versions
; i
++) {
1188 if (strcmp(versions
[i
].name
, symname
) != 0)
1191 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1193 pr_debug("Found checksum %lX vs module %lX\n",
1194 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1198 pr_warn("%s: no symbol version for %s\n", mod
->name
, symname
);
1202 printk("%s: disagrees about version of symbol %s\n",
1203 mod
->name
, symname
);
1207 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1208 unsigned int versindex
,
1211 const unsigned long *crc
;
1213 /* Since this should be found in kernel (which can't be removed),
1214 * no locking is necessary. */
1215 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout
), NULL
,
1218 return check_version(sechdrs
, versindex
,
1219 VMLINUX_SYMBOL_STR(module_layout
), mod
, crc
,
1223 /* First part is kernel version, which we ignore if module has crcs. */
1224 static inline int same_magic(const char *amagic
, const char *bmagic
,
1228 amagic
+= strcspn(amagic
, " ");
1229 bmagic
+= strcspn(bmagic
, " ");
1231 return strcmp(amagic
, bmagic
) == 0;
1234 static inline int check_version(Elf_Shdr
*sechdrs
,
1235 unsigned int versindex
,
1236 const char *symname
,
1238 const unsigned long *crc
,
1239 const struct module
*crc_owner
)
1244 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1245 unsigned int versindex
,
1251 static inline int same_magic(const char *amagic
, const char *bmagic
,
1254 return strcmp(amagic
, bmagic
) == 0;
1256 #endif /* CONFIG_MODVERSIONS */
1258 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1259 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1260 const struct load_info
*info
,
1264 struct module
*owner
;
1265 const struct kernel_symbol
*sym
;
1266 const unsigned long *crc
;
1269 mutex_lock(&module_mutex
);
1270 sym
= find_symbol(name
, &owner
, &crc
,
1271 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1275 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1277 sym
= ERR_PTR(-EINVAL
);
1281 err
= ref_module(mod
, owner
);
1288 /* We must make copy under the lock if we failed to get ref. */
1289 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1291 mutex_unlock(&module_mutex
);
1295 static const struct kernel_symbol
*
1296 resolve_symbol_wait(struct module
*mod
,
1297 const struct load_info
*info
,
1300 const struct kernel_symbol
*ksym
;
1301 char owner
[MODULE_NAME_LEN
];
1303 if (wait_event_interruptible_timeout(module_wq
,
1304 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1305 || PTR_ERR(ksym
) != -EBUSY
,
1307 pr_warn("%s: gave up waiting for init of module %s.\n",
1314 * /sys/module/foo/sections stuff
1315 * J. Corbet <corbet@lwn.net>
1319 #ifdef CONFIG_KALLSYMS
1320 static inline bool sect_empty(const Elf_Shdr
*sect
)
1322 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1325 struct module_sect_attr
1327 struct module_attribute mattr
;
1329 unsigned long address
;
1332 struct module_sect_attrs
1334 struct attribute_group grp
;
1335 unsigned int nsections
;
1336 struct module_sect_attr attrs
[0];
1339 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1340 struct module_kobject
*mk
, char *buf
)
1342 struct module_sect_attr
*sattr
=
1343 container_of(mattr
, struct module_sect_attr
, mattr
);
1344 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1347 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1349 unsigned int section
;
1351 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1352 kfree(sect_attrs
->attrs
[section
].name
);
1356 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1358 unsigned int nloaded
= 0, i
, size
[2];
1359 struct module_sect_attrs
*sect_attrs
;
1360 struct module_sect_attr
*sattr
;
1361 struct attribute
**gattr
;
1363 /* Count loaded sections and allocate structures */
1364 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1365 if (!sect_empty(&info
->sechdrs
[i
]))
1367 size
[0] = ALIGN(sizeof(*sect_attrs
)
1368 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1369 sizeof(sect_attrs
->grp
.attrs
[0]));
1370 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1371 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1372 if (sect_attrs
== NULL
)
1375 /* Setup section attributes. */
1376 sect_attrs
->grp
.name
= "sections";
1377 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1379 sect_attrs
->nsections
= 0;
1380 sattr
= §_attrs
->attrs
[0];
1381 gattr
= §_attrs
->grp
.attrs
[0];
1382 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1383 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1384 if (sect_empty(sec
))
1386 sattr
->address
= sec
->sh_addr
;
1387 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1389 if (sattr
->name
== NULL
)
1391 sect_attrs
->nsections
++;
1392 sysfs_attr_init(&sattr
->mattr
.attr
);
1393 sattr
->mattr
.show
= module_sect_show
;
1394 sattr
->mattr
.store
= NULL
;
1395 sattr
->mattr
.attr
.name
= sattr
->name
;
1396 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1397 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1401 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1404 mod
->sect_attrs
= sect_attrs
;
1407 free_sect_attrs(sect_attrs
);
1410 static void remove_sect_attrs(struct module
*mod
)
1412 if (mod
->sect_attrs
) {
1413 sysfs_remove_group(&mod
->mkobj
.kobj
,
1414 &mod
->sect_attrs
->grp
);
1415 /* We are positive that no one is using any sect attrs
1416 * at this point. Deallocate immediately. */
1417 free_sect_attrs(mod
->sect_attrs
);
1418 mod
->sect_attrs
= NULL
;
1423 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1426 struct module_notes_attrs
{
1427 struct kobject
*dir
;
1429 struct bin_attribute attrs
[0];
1432 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1433 struct bin_attribute
*bin_attr
,
1434 char *buf
, loff_t pos
, size_t count
)
1437 * The caller checked the pos and count against our size.
1439 memcpy(buf
, bin_attr
->private + pos
, count
);
1443 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1446 if (notes_attrs
->dir
) {
1448 sysfs_remove_bin_file(notes_attrs
->dir
,
1449 ¬es_attrs
->attrs
[i
]);
1450 kobject_put(notes_attrs
->dir
);
1455 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1457 unsigned int notes
, loaded
, i
;
1458 struct module_notes_attrs
*notes_attrs
;
1459 struct bin_attribute
*nattr
;
1461 /* failed to create section attributes, so can't create notes */
1462 if (!mod
->sect_attrs
)
1465 /* Count notes sections and allocate structures. */
1467 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1468 if (!sect_empty(&info
->sechdrs
[i
]) &&
1469 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1475 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1476 + notes
* sizeof(notes_attrs
->attrs
[0]),
1478 if (notes_attrs
== NULL
)
1481 notes_attrs
->notes
= notes
;
1482 nattr
= ¬es_attrs
->attrs
[0];
1483 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1484 if (sect_empty(&info
->sechdrs
[i
]))
1486 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1487 sysfs_bin_attr_init(nattr
);
1488 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1489 nattr
->attr
.mode
= S_IRUGO
;
1490 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1491 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1492 nattr
->read
= module_notes_read
;
1498 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1499 if (!notes_attrs
->dir
)
1502 for (i
= 0; i
< notes
; ++i
)
1503 if (sysfs_create_bin_file(notes_attrs
->dir
,
1504 ¬es_attrs
->attrs
[i
]))
1507 mod
->notes_attrs
= notes_attrs
;
1511 free_notes_attrs(notes_attrs
, i
);
1514 static void remove_notes_attrs(struct module
*mod
)
1516 if (mod
->notes_attrs
)
1517 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1522 static inline void add_sect_attrs(struct module
*mod
,
1523 const struct load_info
*info
)
1527 static inline void remove_sect_attrs(struct module
*mod
)
1531 static inline void add_notes_attrs(struct module
*mod
,
1532 const struct load_info
*info
)
1536 static inline void remove_notes_attrs(struct module
*mod
)
1539 #endif /* CONFIG_KALLSYMS */
1541 static void add_usage_links(struct module
*mod
)
1543 #ifdef CONFIG_MODULE_UNLOAD
1544 struct module_use
*use
;
1547 mutex_lock(&module_mutex
);
1548 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1549 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1550 &mod
->mkobj
.kobj
, mod
->name
);
1552 mutex_unlock(&module_mutex
);
1556 static void del_usage_links(struct module
*mod
)
1558 #ifdef CONFIG_MODULE_UNLOAD
1559 struct module_use
*use
;
1561 mutex_lock(&module_mutex
);
1562 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1563 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1564 mutex_unlock(&module_mutex
);
1568 static int module_add_modinfo_attrs(struct module
*mod
)
1570 struct module_attribute
*attr
;
1571 struct module_attribute
*temp_attr
;
1575 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1576 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1578 if (!mod
->modinfo_attrs
)
1581 temp_attr
= mod
->modinfo_attrs
;
1582 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1584 (attr
->test
&& attr
->test(mod
))) {
1585 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1586 sysfs_attr_init(&temp_attr
->attr
);
1587 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1594 static void module_remove_modinfo_attrs(struct module
*mod
)
1596 struct module_attribute
*attr
;
1599 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1600 /* pick a field to test for end of list */
1601 if (!attr
->attr
.name
)
1603 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1607 kfree(mod
->modinfo_attrs
);
1610 static void mod_kobject_put(struct module
*mod
)
1612 DECLARE_COMPLETION_ONSTACK(c
);
1613 mod
->mkobj
.kobj_completion
= &c
;
1614 kobject_put(&mod
->mkobj
.kobj
);
1615 wait_for_completion(&c
);
1618 static int mod_sysfs_init(struct module
*mod
)
1621 struct kobject
*kobj
;
1623 if (!module_sysfs_initialized
) {
1624 pr_err("%s: module sysfs not initialized\n", mod
->name
);
1629 kobj
= kset_find_obj(module_kset
, mod
->name
);
1631 pr_err("%s: module is already loaded\n", mod
->name
);
1637 mod
->mkobj
.mod
= mod
;
1639 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1640 mod
->mkobj
.kobj
.kset
= module_kset
;
1641 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1644 mod_kobject_put(mod
);
1646 /* delay uevent until full sysfs population */
1651 static int mod_sysfs_setup(struct module
*mod
,
1652 const struct load_info
*info
,
1653 struct kernel_param
*kparam
,
1654 unsigned int num_params
)
1658 err
= mod_sysfs_init(mod
);
1662 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1663 if (!mod
->holders_dir
) {
1668 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1670 goto out_unreg_holders
;
1672 err
= module_add_modinfo_attrs(mod
);
1674 goto out_unreg_param
;
1676 add_usage_links(mod
);
1677 add_sect_attrs(mod
, info
);
1678 add_notes_attrs(mod
, info
);
1680 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1684 module_param_sysfs_remove(mod
);
1686 kobject_put(mod
->holders_dir
);
1688 mod_kobject_put(mod
);
1693 static void mod_sysfs_fini(struct module
*mod
)
1695 remove_notes_attrs(mod
);
1696 remove_sect_attrs(mod
);
1697 mod_kobject_put(mod
);
1700 #else /* !CONFIG_SYSFS */
1702 static int mod_sysfs_setup(struct module
*mod
,
1703 const struct load_info
*info
,
1704 struct kernel_param
*kparam
,
1705 unsigned int num_params
)
1710 static void mod_sysfs_fini(struct module
*mod
)
1714 static void module_remove_modinfo_attrs(struct module
*mod
)
1718 static void del_usage_links(struct module
*mod
)
1722 #endif /* CONFIG_SYSFS */
1724 static void mod_sysfs_teardown(struct module
*mod
)
1726 del_usage_links(mod
);
1727 module_remove_modinfo_attrs(mod
);
1728 module_param_sysfs_remove(mod
);
1729 kobject_put(mod
->mkobj
.drivers_dir
);
1730 kobject_put(mod
->holders_dir
);
1731 mod_sysfs_fini(mod
);
1735 * unlink the module with the whole machine is stopped with interrupts off
1736 * - this defends against kallsyms not taking locks
1738 static int __unlink_module(void *_mod
)
1740 struct module
*mod
= _mod
;
1741 list_del(&mod
->list
);
1742 module_bug_cleanup(mod
);
1746 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1748 * LKM RO/NX protection: protect module's text/ro-data
1749 * from modification and any data from execution.
1751 void set_page_attributes(void *start
, void *end
, int (*set
)(unsigned long start
, int num_pages
))
1753 unsigned long begin_pfn
= PFN_DOWN((unsigned long)start
);
1754 unsigned long end_pfn
= PFN_DOWN((unsigned long)end
);
1756 if (end_pfn
> begin_pfn
)
1757 set(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1760 static void set_section_ro_nx(void *base
,
1761 unsigned long text_size
,
1762 unsigned long ro_size
,
1763 unsigned long total_size
)
1765 /* begin and end PFNs of the current subsection */
1766 unsigned long begin_pfn
;
1767 unsigned long end_pfn
;
1770 * Set RO for module text and RO-data:
1771 * - Always protect first page.
1772 * - Do not protect last partial page.
1775 set_page_attributes(base
, base
+ ro_size
, set_memory_ro
);
1778 * Set NX permissions for module data:
1779 * - Do not protect first partial page.
1780 * - Always protect last page.
1782 if (total_size
> text_size
) {
1783 begin_pfn
= PFN_UP((unsigned long)base
+ text_size
);
1784 end_pfn
= PFN_UP((unsigned long)base
+ total_size
);
1785 if (end_pfn
> begin_pfn
)
1786 set_memory_nx(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1790 static void unset_module_core_ro_nx(struct module
*mod
)
1792 set_page_attributes(mod
->module_core
+ mod
->core_text_size
,
1793 mod
->module_core
+ mod
->core_size
,
1795 set_page_attributes(mod
->module_core
,
1796 mod
->module_core
+ mod
->core_ro_size
,
1800 static void unset_module_init_ro_nx(struct module
*mod
)
1802 set_page_attributes(mod
->module_init
+ mod
->init_text_size
,
1803 mod
->module_init
+ mod
->init_size
,
1805 set_page_attributes(mod
->module_init
,
1806 mod
->module_init
+ mod
->init_ro_size
,
1810 /* Iterate through all modules and set each module's text as RW */
1811 void set_all_modules_text_rw(void)
1815 mutex_lock(&module_mutex
);
1816 list_for_each_entry_rcu(mod
, &modules
, list
) {
1817 if (mod
->state
== MODULE_STATE_UNFORMED
)
1819 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1820 set_page_attributes(mod
->module_core
,
1821 mod
->module_core
+ mod
->core_text_size
,
1824 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1825 set_page_attributes(mod
->module_init
,
1826 mod
->module_init
+ mod
->init_text_size
,
1830 mutex_unlock(&module_mutex
);
1833 /* Iterate through all modules and set each module's text as RO */
1834 void set_all_modules_text_ro(void)
1838 mutex_lock(&module_mutex
);
1839 list_for_each_entry_rcu(mod
, &modules
, list
) {
1840 if (mod
->state
== MODULE_STATE_UNFORMED
)
1842 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1843 set_page_attributes(mod
->module_core
,
1844 mod
->module_core
+ mod
->core_text_size
,
1847 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1848 set_page_attributes(mod
->module_init
,
1849 mod
->module_init
+ mod
->init_text_size
,
1853 mutex_unlock(&module_mutex
);
1856 static inline void set_section_ro_nx(void *base
, unsigned long text_size
, unsigned long ro_size
, unsigned long total_size
) { }
1857 static void unset_module_core_ro_nx(struct module
*mod
) { }
1858 static void unset_module_init_ro_nx(struct module
*mod
) { }
1861 void __weak
module_free(struct module
*mod
, void *module_region
)
1863 vfree(module_region
);
1866 void __weak
module_arch_cleanup(struct module
*mod
)
1870 /* Free a module, remove from lists, etc. */
1871 static void free_module(struct module
*mod
)
1873 trace_module_free(mod
);
1875 mod_sysfs_teardown(mod
);
1877 /* We leave it in list to prevent duplicate loads, but make sure
1878 * that noone uses it while it's being deconstructed. */
1879 mod
->state
= MODULE_STATE_UNFORMED
;
1881 /* Remove dynamic debug info */
1882 ddebug_remove_module(mod
->name
);
1884 /* Arch-specific cleanup. */
1885 module_arch_cleanup(mod
);
1887 /* Module unload stuff */
1888 module_unload_free(mod
);
1890 /* Free any allocated parameters. */
1891 destroy_params(mod
->kp
, mod
->num_kp
);
1893 /* Now we can delete it from the lists */
1894 mutex_lock(&module_mutex
);
1895 stop_machine(__unlink_module
, mod
, NULL
);
1896 mutex_unlock(&module_mutex
);
1898 /* This may be NULL, but that's OK */
1899 unset_module_init_ro_nx(mod
);
1900 module_free(mod
, mod
->module_init
);
1902 percpu_modfree(mod
);
1904 /* Free lock-classes: */
1905 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1907 /* Finally, free the core (containing the module structure) */
1908 unset_module_core_ro_nx(mod
);
1909 module_free(mod
, mod
->module_core
);
1912 update_protections(current
->mm
);
1916 void *__symbol_get(const char *symbol
)
1918 struct module
*owner
;
1919 const struct kernel_symbol
*sym
;
1922 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1923 if (sym
&& strong_try_module_get(owner
))
1927 return sym
? (void *)sym
->value
: NULL
;
1929 EXPORT_SYMBOL_GPL(__symbol_get
);
1932 * Ensure that an exported symbol [global namespace] does not already exist
1933 * in the kernel or in some other module's exported symbol table.
1935 * You must hold the module_mutex.
1937 static int verify_export_symbols(struct module
*mod
)
1940 struct module
*owner
;
1941 const struct kernel_symbol
*s
;
1943 const struct kernel_symbol
*sym
;
1946 { mod
->syms
, mod
->num_syms
},
1947 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1948 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1949 #ifdef CONFIG_UNUSED_SYMBOLS
1950 { mod
->unused_syms
, mod
->num_unused_syms
},
1951 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1955 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1956 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1957 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1958 pr_err("%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 pr_warn("%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 pr_warn("%s: module license '%s' taints kernel.\n",
2165 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
);
2354 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2356 unsigned int i
, ndst
;
2360 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2362 mod
->symtab
= (void *)symsec
->sh_addr
;
2363 mod
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2364 /* Make sure we get permanent strtab: don't use info->strtab. */
2365 mod
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2367 /* Set types up while we still have access to sections. */
2368 for (i
= 0; i
< mod
->num_symtab
; i
++)
2369 mod
->symtab
[i
].st_info
= elf_type(&mod
->symtab
[i
], info
);
2371 mod
->core_symtab
= dst
= mod
->module_core
+ info
->symoffs
;
2372 mod
->core_strtab
= s
= mod
->module_core
+ info
->stroffs
;
2374 for (ndst
= i
= 0; i
< mod
->num_symtab
; i
++) {
2376 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2378 dst
[ndst
++].st_name
= s
- mod
->core_strtab
;
2379 s
+= strlcpy(s
, &mod
->strtab
[src
[i
].st_name
],
2383 mod
->core_num_syms
= ndst
;
2386 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2390 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2393 #endif /* CONFIG_KALLSYMS */
2395 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2399 #ifdef CONFIG_DYNAMIC_DEBUG
2400 if (ddebug_add_module(debug
, num
, debug
->modname
))
2401 pr_err("dynamic debug error adding module: %s\n",
2406 static void dynamic_debug_remove(struct _ddebug
*debug
)
2409 ddebug_remove_module(debug
->modname
);
2412 void * __weak
module_alloc(unsigned long size
)
2414 return vmalloc_exec(size
);
2417 static void *module_alloc_update_bounds(unsigned long size
)
2419 void *ret
= module_alloc(size
);
2422 mutex_lock(&module_mutex
);
2423 /* Update module bounds. */
2424 if ((unsigned long)ret
< module_addr_min
)
2425 module_addr_min
= (unsigned long)ret
;
2426 if ((unsigned long)ret
+ size
> module_addr_max
)
2427 module_addr_max
= (unsigned long)ret
+ size
;
2428 mutex_unlock(&module_mutex
);
2433 #ifdef CONFIG_DEBUG_KMEMLEAK
2434 static void kmemleak_load_module(const struct module
*mod
,
2435 const struct load_info
*info
)
2439 /* only scan the sections containing data */
2440 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2442 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2443 /* Scan all writable sections that's not executable */
2444 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
2445 !(info
->sechdrs
[i
].sh_flags
& SHF_WRITE
) ||
2446 (info
->sechdrs
[i
].sh_flags
& SHF_EXECINSTR
))
2449 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2450 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2454 static inline void kmemleak_load_module(const struct module
*mod
,
2455 const struct load_info
*info
)
2460 #ifdef CONFIG_MODULE_SIG
2461 static int module_sig_check(struct load_info
*info
)
2464 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2465 const void *mod
= info
->hdr
;
2467 if (info
->len
> markerlen
&&
2468 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2469 /* We truncate the module to discard the signature */
2470 info
->len
-= markerlen
;
2471 err
= mod_verify_sig(mod
, &info
->len
);
2475 info
->sig_ok
= true;
2479 /* Not having a signature is only an error if we're strict. */
2480 if (err
< 0 && fips_enabled
)
2481 panic("Module verification failed with error %d in FIPS mode\n",
2483 if (err
== -ENOKEY
&& !sig_enforce
)
2488 #else /* !CONFIG_MODULE_SIG */
2489 static int module_sig_check(struct load_info
*info
)
2493 #endif /* !CONFIG_MODULE_SIG */
2495 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2496 static int elf_header_check(struct load_info
*info
)
2498 if (info
->len
< sizeof(*(info
->hdr
)))
2501 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2502 || info
->hdr
->e_type
!= ET_REL
2503 || !elf_check_arch(info
->hdr
)
2504 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2507 if (info
->hdr
->e_shoff
>= info
->len
2508 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2509 info
->len
- info
->hdr
->e_shoff
))
2515 /* Sets info->hdr and info->len. */
2516 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2517 struct load_info
*info
)
2522 if (info
->len
< sizeof(*(info
->hdr
)))
2525 err
= security_kernel_module_from_file(NULL
);
2529 /* Suck in entire file: we'll want most of it. */
2530 info
->hdr
= vmalloc(info
->len
);
2534 if (copy_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2542 /* Sets info->hdr and info->len. */
2543 static int copy_module_from_fd(int fd
, struct load_info
*info
)
2545 struct fd f
= fdget(fd
);
2554 err
= security_kernel_module_from_file(f
.file
);
2558 err
= vfs_getattr(&f
.file
->f_path
, &stat
);
2562 if (stat
.size
> INT_MAX
) {
2567 /* Don't hand 0 to vmalloc, it whines. */
2568 if (stat
.size
== 0) {
2573 info
->hdr
= vmalloc(stat
.size
);
2580 while (pos
< stat
.size
) {
2581 bytes
= kernel_read(f
.file
, pos
, (char *)(info
->hdr
) + pos
,
2599 static void free_copy(struct load_info
*info
)
2604 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2608 /* This should always be true, but let's be sure. */
2609 info
->sechdrs
[0].sh_addr
= 0;
2611 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2612 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2613 if (shdr
->sh_type
!= SHT_NOBITS
2614 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2615 pr_err("Module len %lu truncated\n", info
->len
);
2619 /* Mark all sections sh_addr with their address in the
2621 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2623 #ifndef CONFIG_MODULE_UNLOAD
2624 /* Don't load .exit sections */
2625 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2626 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2630 /* Track but don't keep modinfo and version sections. */
2631 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2632 info
->index
.vers
= 0; /* Pretend no __versions section! */
2634 info
->index
.vers
= find_sec(info
, "__versions");
2635 info
->index
.info
= find_sec(info
, ".modinfo");
2636 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2637 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2642 * Set up our basic convenience variables (pointers to section headers,
2643 * search for module section index etc), and do some basic section
2646 * Return the temporary module pointer (we'll replace it with the final
2647 * one when we move the module sections around).
2649 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2655 /* Set up the convenience variables */
2656 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2657 info
->secstrings
= (void *)info
->hdr
2658 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2660 err
= rewrite_section_headers(info
, flags
);
2662 return ERR_PTR(err
);
2664 /* Find internal symbols and strings. */
2665 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2666 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2667 info
->index
.sym
= i
;
2668 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2669 info
->strtab
= (char *)info
->hdr
2670 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2675 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2676 if (!info
->index
.mod
) {
2677 pr_warn("No module found in object\n");
2678 return ERR_PTR(-ENOEXEC
);
2680 /* This is temporary: point mod into copy of data. */
2681 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2683 if (info
->index
.sym
== 0) {
2684 pr_warn("%s: module has no symbols (stripped?)\n", mod
->name
);
2685 return ERR_PTR(-ENOEXEC
);
2688 info
->index
.pcpu
= find_pcpusec(info
);
2690 /* Check module struct version now, before we try to use module. */
2691 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2692 return ERR_PTR(-ENOEXEC
);
2697 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2699 const char *modmagic
= get_modinfo(info
, "vermagic");
2702 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2705 /* This is allowed: modprobe --force will invalidate it. */
2707 err
= try_to_force_load(mod
, "bad vermagic");
2710 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2711 pr_err("%s: version magic '%s' should be '%s'\n",
2712 mod
->name
, modmagic
, vermagic
);
2716 if (!get_modinfo(info
, "intree"))
2717 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2719 if (get_modinfo(info
, "staging")) {
2720 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2721 pr_warn("%s: module is from the staging directory, the quality "
2722 "is unknown, you have been warned.\n", mod
->name
);
2725 /* Set up license info based on the info section */
2726 set_license(mod
, get_modinfo(info
, "license"));
2731 static void find_module_sections(struct module
*mod
, struct load_info
*info
)
2733 mod
->kp
= section_objs(info
, "__param",
2734 sizeof(*mod
->kp
), &mod
->num_kp
);
2735 mod
->syms
= section_objs(info
, "__ksymtab",
2736 sizeof(*mod
->syms
), &mod
->num_syms
);
2737 mod
->crcs
= section_addr(info
, "__kcrctab");
2738 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2739 sizeof(*mod
->gpl_syms
),
2740 &mod
->num_gpl_syms
);
2741 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2742 mod
->gpl_future_syms
= section_objs(info
,
2743 "__ksymtab_gpl_future",
2744 sizeof(*mod
->gpl_future_syms
),
2745 &mod
->num_gpl_future_syms
);
2746 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2748 #ifdef CONFIG_UNUSED_SYMBOLS
2749 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2750 sizeof(*mod
->unused_syms
),
2751 &mod
->num_unused_syms
);
2752 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2753 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2754 sizeof(*mod
->unused_gpl_syms
),
2755 &mod
->num_unused_gpl_syms
);
2756 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2758 #ifdef CONFIG_CONSTRUCTORS
2759 mod
->ctors
= section_objs(info
, ".ctors",
2760 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2763 #ifdef CONFIG_TRACEPOINTS
2764 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2765 sizeof(*mod
->tracepoints_ptrs
),
2766 &mod
->num_tracepoints
);
2768 #ifdef HAVE_JUMP_LABEL
2769 mod
->jump_entries
= section_objs(info
, "__jump_table",
2770 sizeof(*mod
->jump_entries
),
2771 &mod
->num_jump_entries
);
2773 #ifdef CONFIG_EVENT_TRACING
2774 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2775 sizeof(*mod
->trace_events
),
2776 &mod
->num_trace_events
);
2778 #ifdef CONFIG_TRACING
2779 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2780 sizeof(*mod
->trace_bprintk_fmt_start
),
2781 &mod
->num_trace_bprintk_fmt
);
2783 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2784 /* sechdrs[0].sh_size is always zero */
2785 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2786 sizeof(*mod
->ftrace_callsites
),
2787 &mod
->num_ftrace_callsites
);
2790 mod
->extable
= section_objs(info
, "__ex_table",
2791 sizeof(*mod
->extable
), &mod
->num_exentries
);
2793 if (section_addr(info
, "__obsparm"))
2794 pr_warn("%s: Ignoring obsolete parameters\n", mod
->name
);
2796 info
->debug
= section_objs(info
, "__verbose",
2797 sizeof(*info
->debug
), &info
->num_debug
);
2800 static int move_module(struct module
*mod
, struct load_info
*info
)
2805 /* Do the allocs. */
2806 ptr
= module_alloc_update_bounds(mod
->core_size
);
2808 * The pointer to this block is stored in the module structure
2809 * which is inside the block. Just mark it as not being a
2812 kmemleak_not_leak(ptr
);
2816 memset(ptr
, 0, mod
->core_size
);
2817 mod
->module_core
= ptr
;
2819 if (mod
->init_size
) {
2820 ptr
= module_alloc_update_bounds(mod
->init_size
);
2822 * The pointer to this block is stored in the module structure
2823 * which is inside the block. This block doesn't need to be
2824 * scanned as it contains data and code that will be freed
2825 * after the module is initialized.
2827 kmemleak_ignore(ptr
);
2829 module_free(mod
, mod
->module_core
);
2832 memset(ptr
, 0, mod
->init_size
);
2833 mod
->module_init
= ptr
;
2835 mod
->module_init
= NULL
;
2837 /* Transfer each section which specifies SHF_ALLOC */
2838 pr_debug("final section addresses:\n");
2839 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
2841 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2843 if (!(shdr
->sh_flags
& SHF_ALLOC
))
2846 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
2847 dest
= mod
->module_init
2848 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
2850 dest
= mod
->module_core
+ shdr
->sh_entsize
;
2852 if (shdr
->sh_type
!= SHT_NOBITS
)
2853 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
2854 /* Update sh_addr to point to copy in image. */
2855 shdr
->sh_addr
= (unsigned long)dest
;
2856 pr_debug("\t0x%lx %s\n",
2857 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
2863 static int check_module_license_and_versions(struct module
*mod
)
2866 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2867 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2868 * using GPL-only symbols it needs.
2870 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2871 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
2873 /* driverloader was caught wrongly pretending to be under GPL */
2874 if (strcmp(mod
->name
, "driverloader") == 0)
2875 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2876 LOCKDEP_NOW_UNRELIABLE
);
2878 /* lve claims to be GPL but upstream won't provide source */
2879 if (strcmp(mod
->name
, "lve") == 0)
2880 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2881 LOCKDEP_NOW_UNRELIABLE
);
2883 #ifdef CONFIG_MODVERSIONS
2884 if ((mod
->num_syms
&& !mod
->crcs
)
2885 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2886 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2887 #ifdef CONFIG_UNUSED_SYMBOLS
2888 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2889 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2892 return try_to_force_load(mod
,
2893 "no versions for exported symbols");
2899 static void flush_module_icache(const struct module
*mod
)
2901 mm_segment_t old_fs
;
2903 /* flush the icache in correct context */
2908 * Flush the instruction cache, since we've played with text.
2909 * Do it before processing of module parameters, so the module
2910 * can provide parameter accessor functions of its own.
2912 if (mod
->module_init
)
2913 flush_icache_range((unsigned long)mod
->module_init
,
2914 (unsigned long)mod
->module_init
2916 flush_icache_range((unsigned long)mod
->module_core
,
2917 (unsigned long)mod
->module_core
+ mod
->core_size
);
2922 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
2930 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
2932 /* Module within temporary copy. */
2936 mod
= setup_load_info(info
, flags
);
2940 err
= check_modinfo(mod
, info
, flags
);
2942 return ERR_PTR(err
);
2944 /* Allow arches to frob section contents and sizes. */
2945 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
2946 info
->secstrings
, mod
);
2948 return ERR_PTR(err
);
2950 /* We will do a special allocation for per-cpu sections later. */
2951 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2953 /* Determine total sizes, and put offsets in sh_entsize. For now
2954 this is done generically; there doesn't appear to be any
2955 special cases for the architectures. */
2956 layout_sections(mod
, info
);
2957 layout_symtab(mod
, info
);
2959 /* Allocate and move to the final place */
2960 err
= move_module(mod
, info
);
2962 return ERR_PTR(err
);
2964 /* Module has been copied to its final place now: return it. */
2965 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2966 kmemleak_load_module(mod
, info
);
2970 /* mod is no longer valid after this! */
2971 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
2973 percpu_modfree(mod
);
2974 module_free(mod
, mod
->module_init
);
2975 module_free(mod
, mod
->module_core
);
2978 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
2979 const Elf_Shdr
*sechdrs
,
2985 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
2987 /* Sort exception table now relocations are done. */
2988 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2990 /* Copy relocated percpu area over. */
2991 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
2992 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
2994 /* Setup kallsyms-specific fields. */
2995 add_kallsyms(mod
, info
);
2997 /* Arch-specific module finalizing. */
2998 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3001 /* Is this module of this name done loading? No locks held. */
3002 static bool finished_loading(const char *name
)
3007 mutex_lock(&module_mutex
);
3008 mod
= find_module_all(name
, strlen(name
), true);
3009 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3010 || mod
->state
== MODULE_STATE_GOING
;
3011 mutex_unlock(&module_mutex
);
3016 /* Call module constructors. */
3017 static void do_mod_ctors(struct module
*mod
)
3019 #ifdef CONFIG_CONSTRUCTORS
3022 for (i
= 0; i
< mod
->num_ctors
; i
++)
3027 /* This is where the real work happens */
3028 static int do_init_module(struct module
*mod
)
3033 * We want to find out whether @mod uses async during init. Clear
3034 * PF_USED_ASYNC. async_schedule*() will set it.
3036 current
->flags
&= ~PF_USED_ASYNC
;
3038 blocking_notifier_call_chain(&module_notify_list
,
3039 MODULE_STATE_COMING
, mod
);
3041 /* Set RO and NX regions for core */
3042 set_section_ro_nx(mod
->module_core
,
3043 mod
->core_text_size
,
3047 /* Set RO and NX regions for init */
3048 set_section_ro_nx(mod
->module_init
,
3049 mod
->init_text_size
,
3054 /* Start the module */
3055 if (mod
->init
!= NULL
)
3056 ret
= do_one_initcall(mod
->init
);
3058 /* Init routine failed: abort. Try to protect us from
3059 buggy refcounters. */
3060 mod
->state
= MODULE_STATE_GOING
;
3061 synchronize_sched();
3063 blocking_notifier_call_chain(&module_notify_list
,
3064 MODULE_STATE_GOING
, mod
);
3066 wake_up_all(&module_wq
);
3070 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3071 "follow 0/-E convention\n"
3072 "%s: loading module anyway...\n",
3073 __func__
, mod
->name
, ret
, __func__
);
3077 /* Now it's a first class citizen! */
3078 mod
->state
= MODULE_STATE_LIVE
;
3079 blocking_notifier_call_chain(&module_notify_list
,
3080 MODULE_STATE_LIVE
, mod
);
3083 * We need to finish all async code before the module init sequence
3084 * is done. This has potential to deadlock. For example, a newly
3085 * detected block device can trigger request_module() of the
3086 * default iosched from async probing task. Once userland helper
3087 * reaches here, async_synchronize_full() will wait on the async
3088 * task waiting on request_module() and deadlock.
3090 * This deadlock is avoided by perfomring async_synchronize_full()
3091 * iff module init queued any async jobs. This isn't a full
3092 * solution as it will deadlock the same if module loading from
3093 * async jobs nests more than once; however, due to the various
3094 * constraints, this hack seems to be the best option for now.
3095 * Please refer to the following thread for details.
3097 * http://thread.gmane.org/gmane.linux.kernel/1420814
3099 if (current
->flags
& PF_USED_ASYNC
)
3100 async_synchronize_full();
3102 mutex_lock(&module_mutex
);
3103 /* Drop initial reference. */
3105 trim_init_extable(mod
);
3106 #ifdef CONFIG_KALLSYMS
3107 mod
->num_symtab
= mod
->core_num_syms
;
3108 mod
->symtab
= mod
->core_symtab
;
3109 mod
->strtab
= mod
->core_strtab
;
3111 unset_module_init_ro_nx(mod
);
3112 module_free(mod
, mod
->module_init
);
3113 mod
->module_init
= NULL
;
3115 mod
->init_ro_size
= 0;
3116 mod
->init_text_size
= 0;
3117 mutex_unlock(&module_mutex
);
3118 wake_up_all(&module_wq
);
3123 static int may_init_module(void)
3125 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3132 * We try to place it in the list now to make sure it's unique before
3133 * we dedicate too many resources. In particular, temporary percpu
3134 * memory exhaustion.
3136 static int add_unformed_module(struct module
*mod
)
3141 mod
->state
= MODULE_STATE_UNFORMED
;
3144 mutex_lock(&module_mutex
);
3145 old
= find_module_all(mod
->name
, strlen(mod
->name
), true);
3147 if (old
->state
== MODULE_STATE_COMING
3148 || old
->state
== MODULE_STATE_UNFORMED
) {
3149 /* Wait in case it fails to load. */
3150 mutex_unlock(&module_mutex
);
3151 err
= wait_event_interruptible(module_wq
,
3152 finished_loading(mod
->name
));
3160 list_add_rcu(&mod
->list
, &modules
);
3164 mutex_unlock(&module_mutex
);
3169 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3173 mutex_lock(&module_mutex
);
3175 /* Find duplicate symbols (must be called under lock). */
3176 err
= verify_export_symbols(mod
);
3180 /* This relies on module_mutex for list integrity. */
3181 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3183 /* Mark state as coming so strong_try_module_get() ignores us,
3184 * but kallsyms etc. can see us. */
3185 mod
->state
= MODULE_STATE_COMING
;
3188 mutex_unlock(&module_mutex
);
3192 static int unknown_module_param_cb(char *param
, char *val
, const char *modname
)
3194 /* Check for magic 'dyndbg' arg */
3195 int ret
= ddebug_dyndbg_module_param_cb(param
, val
, modname
);
3197 pr_warn("%s: unknown parameter '%s' ignored\n", modname
, param
);
3201 /* Allocate and load the module: note that size of section 0 is always
3202 zero, and we rely on this for optional sections. */
3203 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3209 err
= module_sig_check(info
);
3213 err
= elf_header_check(info
);
3217 /* Figure out module layout, and allocate all the memory. */
3218 mod
= layout_and_allocate(info
, flags
);
3224 /* Reserve our place in the list. */
3225 err
= add_unformed_module(mod
);
3229 #ifdef CONFIG_MODULE_SIG
3230 mod
->sig_ok
= info
->sig_ok
;
3232 pr_notice_once("%s: module verification failed: signature "
3233 "and/or required key missing - tainting "
3234 "kernel\n", mod
->name
);
3235 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_STILL_OK
);
3239 /* To avoid stressing percpu allocator, do this once we're unique. */
3240 err
= percpu_modalloc(mod
, info
);
3244 /* Now module is in final location, initialize linked lists, etc. */
3245 err
= module_unload_init(mod
);
3249 /* Now we've got everything in the final locations, we can
3250 * find optional sections. */
3251 find_module_sections(mod
, info
);
3253 err
= check_module_license_and_versions(mod
);
3257 /* Set up MODINFO_ATTR fields */
3258 setup_modinfo(mod
, info
);
3260 /* Fix up syms, so that st_value is a pointer to location. */
3261 err
= simplify_symbols(mod
, info
);
3265 err
= apply_relocations(mod
, info
);
3269 err
= post_relocation(mod
, info
);
3273 flush_module_icache(mod
);
3275 /* Now copy in args */
3276 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3277 if (IS_ERR(mod
->args
)) {
3278 err
= PTR_ERR(mod
->args
);
3279 goto free_arch_cleanup
;
3282 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3284 /* Finally it's fully formed, ready to start executing. */
3285 err
= complete_formation(mod
, info
);
3287 goto ddebug_cleanup
;
3289 /* Module is ready to execute: parsing args may do that. */
3290 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3291 -32768, 32767, unknown_module_param_cb
);
3295 /* Link in to syfs. */
3296 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3300 /* Get rid of temporary copy. */
3304 trace_module_load(mod
);
3306 return do_init_module(mod
);
3309 /* module_bug_cleanup needs module_mutex protection */
3310 mutex_lock(&module_mutex
);
3311 module_bug_cleanup(mod
);
3312 mutex_unlock(&module_mutex
);
3314 dynamic_debug_remove(info
->debug
);
3315 synchronize_sched();
3318 module_arch_cleanup(mod
);
3322 module_unload_free(mod
);
3324 mutex_lock(&module_mutex
);
3325 /* Unlink carefully: kallsyms could be walking list. */
3326 list_del_rcu(&mod
->list
);
3327 wake_up_all(&module_wq
);
3328 mutex_unlock(&module_mutex
);
3330 module_deallocate(mod
, info
);
3336 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3337 unsigned long, len
, const char __user
*, uargs
)
3340 struct load_info info
= { };
3342 err
= may_init_module();
3346 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3349 err
= copy_module_from_user(umod
, len
, &info
);
3353 return load_module(&info
, uargs
, 0);
3356 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3359 struct load_info info
= { };
3361 err
= may_init_module();
3365 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3367 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3368 |MODULE_INIT_IGNORE_VERMAGIC
))
3371 err
= copy_module_from_fd(fd
, &info
);
3375 return load_module(&info
, uargs
, flags
);
3378 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3380 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3383 #ifdef CONFIG_KALLSYMS
3385 * This ignores the intensely annoying "mapping symbols" found
3386 * in ARM ELF files: $a, $t and $d.
3388 static inline int is_arm_mapping_symbol(const char *str
)
3390 return str
[0] == '$' && strchr("atd", str
[1])
3391 && (str
[2] == '\0' || str
[2] == '.');
3394 static const char *get_ksymbol(struct module
*mod
,
3396 unsigned long *size
,
3397 unsigned long *offset
)
3399 unsigned int i
, best
= 0;
3400 unsigned long nextval
;
3402 /* At worse, next value is at end of module */
3403 if (within_module_init(addr
, mod
))
3404 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
3406 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
3408 /* Scan for closest preceding symbol, and next symbol. (ELF
3409 starts real symbols at 1). */
3410 for (i
= 1; i
< mod
->num_symtab
; i
++) {
3411 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3414 /* We ignore unnamed symbols: they're uninformative
3415 * and inserted at a whim. */
3416 if (mod
->symtab
[i
].st_value
<= addr
3417 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
3418 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3419 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3421 if (mod
->symtab
[i
].st_value
> addr
3422 && mod
->symtab
[i
].st_value
< nextval
3423 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3424 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3425 nextval
= mod
->symtab
[i
].st_value
;
3432 *size
= nextval
- mod
->symtab
[best
].st_value
;
3434 *offset
= addr
- mod
->symtab
[best
].st_value
;
3435 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
3438 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3439 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3440 const char *module_address_lookup(unsigned long addr
,
3441 unsigned long *size
,
3442 unsigned long *offset
,
3447 const char *ret
= NULL
;
3450 list_for_each_entry_rcu(mod
, &modules
, list
) {
3451 if (mod
->state
== MODULE_STATE_UNFORMED
)
3453 if (within_module_init(addr
, mod
) ||
3454 within_module_core(addr
, mod
)) {
3456 *modname
= mod
->name
;
3457 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3461 /* Make a copy in here where it's safe */
3463 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3470 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3475 list_for_each_entry_rcu(mod
, &modules
, list
) {
3476 if (mod
->state
== MODULE_STATE_UNFORMED
)
3478 if (within_module_init(addr
, mod
) ||
3479 within_module_core(addr
, mod
)) {
3482 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3485 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3495 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3496 unsigned long *offset
, char *modname
, char *name
)
3501 list_for_each_entry_rcu(mod
, &modules
, list
) {
3502 if (mod
->state
== MODULE_STATE_UNFORMED
)
3504 if (within_module_init(addr
, mod
) ||
3505 within_module_core(addr
, mod
)) {
3508 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3512 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3514 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3524 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3525 char *name
, char *module_name
, int *exported
)
3530 list_for_each_entry_rcu(mod
, &modules
, list
) {
3531 if (mod
->state
== MODULE_STATE_UNFORMED
)
3533 if (symnum
< mod
->num_symtab
) {
3534 *value
= mod
->symtab
[symnum
].st_value
;
3535 *type
= mod
->symtab
[symnum
].st_info
;
3536 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
3538 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3539 *exported
= is_exported(name
, *value
, mod
);
3543 symnum
-= mod
->num_symtab
;
3549 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3553 for (i
= 0; i
< mod
->num_symtab
; i
++)
3554 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
3555 mod
->symtab
[i
].st_info
!= 'U')
3556 return mod
->symtab
[i
].st_value
;
3560 /* Look for this name: can be of form module:name. */
3561 unsigned long module_kallsyms_lookup_name(const char *name
)
3565 unsigned long ret
= 0;
3567 /* Don't lock: we're in enough trouble already. */
3569 if ((colon
= strchr(name
, ':')) != NULL
) {
3570 if ((mod
= find_module_all(name
, colon
- name
, false)) != NULL
)
3571 ret
= mod_find_symname(mod
, colon
+1);
3573 list_for_each_entry_rcu(mod
, &modules
, list
) {
3574 if (mod
->state
== MODULE_STATE_UNFORMED
)
3576 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3584 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3585 struct module
*, unsigned long),
3592 list_for_each_entry(mod
, &modules
, list
) {
3593 if (mod
->state
== MODULE_STATE_UNFORMED
)
3595 for (i
= 0; i
< mod
->num_symtab
; i
++) {
3596 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
3597 mod
, mod
->symtab
[i
].st_value
);
3604 #endif /* CONFIG_KALLSYMS */
3606 static char *module_flags(struct module
*mod
, char *buf
)
3610 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
3612 mod
->state
== MODULE_STATE_GOING
||
3613 mod
->state
== MODULE_STATE_COMING
) {
3615 bx
+= module_flags_taint(mod
, buf
+ bx
);
3616 /* Show a - for module-is-being-unloaded */
3617 if (mod
->state
== MODULE_STATE_GOING
)
3619 /* Show a + for module-is-being-loaded */
3620 if (mod
->state
== MODULE_STATE_COMING
)
3629 #ifdef CONFIG_PROC_FS
3630 /* Called by the /proc file system to return a list of modules. */
3631 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3633 mutex_lock(&module_mutex
);
3634 return seq_list_start(&modules
, *pos
);
3637 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3639 return seq_list_next(p
, &modules
, pos
);
3642 static void m_stop(struct seq_file
*m
, void *p
)
3644 mutex_unlock(&module_mutex
);
3647 static int m_show(struct seq_file
*m
, void *p
)
3649 struct module
*mod
= list_entry(p
, struct module
, list
);
3652 /* We always ignore unformed modules. */
3653 if (mod
->state
== MODULE_STATE_UNFORMED
)
3656 seq_printf(m
, "%s %u",
3657 mod
->name
, mod
->init_size
+ mod
->core_size
);
3658 print_unload_info(m
, mod
);
3660 /* Informative for users. */
3661 seq_printf(m
, " %s",
3662 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3663 mod
->state
== MODULE_STATE_COMING
? "Loading":
3665 /* Used by oprofile and other similar tools. */
3666 seq_printf(m
, " 0x%pK", mod
->module_core
);
3670 seq_printf(m
, " %s", module_flags(mod
, buf
));
3672 seq_printf(m
, "\n");
3676 /* Format: modulename size refcount deps address
3678 Where refcount is a number or -, and deps is a comma-separated list
3681 static const struct seq_operations modules_op
= {
3688 static int modules_open(struct inode
*inode
, struct file
*file
)
3690 return seq_open(file
, &modules_op
);
3693 static const struct file_operations proc_modules_operations
= {
3694 .open
= modules_open
,
3696 .llseek
= seq_lseek
,
3697 .release
= seq_release
,
3700 static int __init
proc_modules_init(void)
3702 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3705 module_init(proc_modules_init
);
3708 /* Given an address, look for it in the module exception tables. */
3709 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3711 const struct exception_table_entry
*e
= NULL
;
3715 list_for_each_entry_rcu(mod
, &modules
, list
) {
3716 if (mod
->state
== MODULE_STATE_UNFORMED
)
3718 if (mod
->num_exentries
== 0)
3721 e
= search_extable(mod
->extable
,
3722 mod
->extable
+ mod
->num_exentries
- 1,
3729 /* Now, if we found one, we are running inside it now, hence
3730 we cannot unload the module, hence no refcnt needed. */
3735 * is_module_address - is this address inside a module?
3736 * @addr: the address to check.
3738 * See is_module_text_address() if you simply want to see if the address
3739 * is code (not data).
3741 bool is_module_address(unsigned long addr
)
3746 ret
= __module_address(addr
) != NULL
;
3753 * __module_address - get the module which contains an address.
3754 * @addr: the address.
3756 * Must be called with preempt disabled or module mutex held so that
3757 * module doesn't get freed during this.
3759 struct module
*__module_address(unsigned long addr
)
3763 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3766 list_for_each_entry_rcu(mod
, &modules
, list
) {
3767 if (mod
->state
== MODULE_STATE_UNFORMED
)
3769 if (within_module_core(addr
, mod
)
3770 || within_module_init(addr
, mod
))
3775 EXPORT_SYMBOL_GPL(__module_address
);
3778 * is_module_text_address - is this address inside module code?
3779 * @addr: the address to check.
3781 * See is_module_address() if you simply want to see if the address is
3782 * anywhere in a module. See kernel_text_address() for testing if an
3783 * address corresponds to kernel or module code.
3785 bool is_module_text_address(unsigned long addr
)
3790 ret
= __module_text_address(addr
) != NULL
;
3797 * __module_text_address - get the module whose code contains an address.
3798 * @addr: the address.
3800 * Must be called with preempt disabled or module mutex held so that
3801 * module doesn't get freed during this.
3803 struct module
*__module_text_address(unsigned long addr
)
3805 struct module
*mod
= __module_address(addr
);
3807 /* Make sure it's within the text section. */
3808 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3809 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3814 EXPORT_SYMBOL_GPL(__module_text_address
);
3816 /* Don't grab lock, we're oopsing. */
3817 void print_modules(void)
3822 printk(KERN_DEFAULT
"Modules linked in:");
3823 /* Most callers should already have preempt disabled, but make sure */
3825 list_for_each_entry_rcu(mod
, &modules
, list
) {
3826 if (mod
->state
== MODULE_STATE_UNFORMED
)
3828 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3831 if (last_unloaded_module
[0])
3832 printk(" [last unloaded: %s]", last_unloaded_module
);
3836 #ifdef CONFIG_MODVERSIONS
3837 /* Generate the signature for all relevant module structures here.
3838 * If these change, we don't want to try to parse the module. */
3839 void module_layout(struct module
*mod
,
3840 struct modversion_info
*ver
,
3841 struct kernel_param
*kp
,
3842 struct kernel_symbol
*ks
,
3843 struct tracepoint
* const *tp
)
3846 EXPORT_SYMBOL(module_layout
);