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>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
58 #include <linux/jump_label.h>
59 #include <linux/pfn.h>
60 #include <linux/bsearch.h>
61 #include <linux/fips.h>
62 #include "module-internal.h"
64 #define CREATE_TRACE_POINTS
65 #include <trace/events/module.h>
67 #ifndef ARCH_SHF_SMALL
68 #define ARCH_SHF_SMALL 0
72 * Modules' sections will be aligned on page boundaries
73 * to ensure complete separation of code and data, but
74 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
76 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
77 # define debug_align(X) ALIGN(X, PAGE_SIZE)
79 # define debug_align(X) (X)
83 * Given BASE and SIZE this macro calculates the number of pages the
84 * memory regions occupies
86 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
87 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
88 PFN_DOWN((unsigned long)BASE) + 1) \
91 /* If this is set, the section belongs in the init part of the module */
92 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
96 * 1) List of modules (also safely readable with preempt_disable),
97 * 2) module_use links,
98 * 3) module_addr_min/module_addr_max.
99 * (delete uses stop_machine/add uses RCU list operations). */
100 DEFINE_MUTEX(module_mutex
);
101 EXPORT_SYMBOL_GPL(module_mutex
);
102 static LIST_HEAD(modules
);
103 #ifdef CONFIG_KGDB_KDB
104 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
105 #endif /* CONFIG_KGDB_KDB */
107 #ifdef CONFIG_MODULE_SIG
108 #ifdef CONFIG_MODULE_SIG_FORCE
109 static bool sig_enforce
= true;
111 static bool sig_enforce
= false;
113 static int param_set_bool_enable_only(const char *val
,
114 const struct kernel_param
*kp
)
118 struct kernel_param dummy_kp
= *kp
;
120 dummy_kp
.arg
= &test
;
122 err
= param_set_bool(val
, &dummy_kp
);
126 /* Don't let them unset it once it's set! */
127 if (!test
&& sig_enforce
)
135 static const struct kernel_param_ops param_ops_bool_enable_only
= {
136 .set
= param_set_bool_enable_only
,
137 .get
= param_get_bool
,
139 #define param_check_bool_enable_only param_check_bool
141 module_param(sig_enforce
, bool_enable_only
, 0644);
142 #endif /* !CONFIG_MODULE_SIG_FORCE */
143 #endif /* CONFIG_MODULE_SIG */
145 /* Block module loading/unloading? */
146 int modules_disabled
= 0;
147 core_param(nomodule
, modules_disabled
, bint
, 0);
149 /* Waiting for a module to finish initializing? */
150 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
152 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
154 /* Bounds of module allocation, for speeding __module_address.
155 * Protected by module_mutex. */
156 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
158 int register_module_notifier(struct notifier_block
* nb
)
160 return blocking_notifier_chain_register(&module_notify_list
, nb
);
162 EXPORT_SYMBOL(register_module_notifier
);
164 int unregister_module_notifier(struct notifier_block
* nb
)
166 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
168 EXPORT_SYMBOL(unregister_module_notifier
);
174 char *secstrings
, *strtab
;
175 unsigned long symoffs
, stroffs
;
176 struct _ddebug
*debug
;
177 unsigned int num_debug
;
180 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
184 /* We require a truly strong try_module_get(): 0 means failure due to
185 ongoing or failed initialization etc. */
186 static inline int strong_try_module_get(struct module
*mod
)
188 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
190 if (try_module_get(mod
))
196 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
199 mod
->taints
|= (1U << flag
);
203 * A thread that wants to hold a reference to a module only while it
204 * is running can call this to safely exit. nfsd and lockd use this.
206 void __module_put_and_exit(struct module
*mod
, long code
)
211 EXPORT_SYMBOL(__module_put_and_exit
);
213 /* Find a module section: 0 means not found. */
214 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
218 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
219 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
220 /* Alloc bit cleared means "ignore it." */
221 if ((shdr
->sh_flags
& SHF_ALLOC
)
222 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
228 /* Find a module section, or NULL. */
229 static void *section_addr(const struct load_info
*info
, const char *name
)
231 /* Section 0 has sh_addr 0. */
232 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
235 /* Find a module section, or NULL. Fill in number of "objects" in section. */
236 static void *section_objs(const struct load_info
*info
,
241 unsigned int sec
= find_sec(info
, name
);
243 /* Section 0 has sh_addr 0 and sh_size 0. */
244 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
245 return (void *)info
->sechdrs
[sec
].sh_addr
;
248 /* Provided by the linker */
249 extern const struct kernel_symbol __start___ksymtab
[];
250 extern const struct kernel_symbol __stop___ksymtab
[];
251 extern const struct kernel_symbol __start___ksymtab_gpl
[];
252 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
253 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
254 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
255 extern const unsigned long __start___kcrctab
[];
256 extern const unsigned long __start___kcrctab_gpl
[];
257 extern const unsigned long __start___kcrctab_gpl_future
[];
258 #ifdef CONFIG_UNUSED_SYMBOLS
259 extern const struct kernel_symbol __start___ksymtab_unused
[];
260 extern const struct kernel_symbol __stop___ksymtab_unused
[];
261 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
262 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
263 extern const unsigned long __start___kcrctab_unused
[];
264 extern const unsigned long __start___kcrctab_unused_gpl
[];
267 #ifndef CONFIG_MODVERSIONS
268 #define symversion(base, idx) NULL
270 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
273 static bool each_symbol_in_section(const struct symsearch
*arr
,
274 unsigned int arrsize
,
275 struct module
*owner
,
276 bool (*fn
)(const struct symsearch
*syms
,
277 struct module
*owner
,
283 for (j
= 0; j
< arrsize
; j
++) {
284 if (fn(&arr
[j
], owner
, data
))
291 /* Returns true as soon as fn returns true, otherwise false. */
292 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
293 struct module
*owner
,
298 static const struct symsearch arr
[] = {
299 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
300 NOT_GPL_ONLY
, false },
301 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
302 __start___kcrctab_gpl
,
304 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
305 __start___kcrctab_gpl_future
,
306 WILL_BE_GPL_ONLY
, false },
307 #ifdef CONFIG_UNUSED_SYMBOLS
308 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
309 __start___kcrctab_unused
,
310 NOT_GPL_ONLY
, true },
311 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
312 __start___kcrctab_unused_gpl
,
317 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
320 list_for_each_entry_rcu(mod
, &modules
, list
) {
321 struct symsearch arr
[] = {
322 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
323 NOT_GPL_ONLY
, false },
324 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
327 { mod
->gpl_future_syms
,
328 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
329 mod
->gpl_future_crcs
,
330 WILL_BE_GPL_ONLY
, false },
331 #ifdef CONFIG_UNUSED_SYMBOLS
333 mod
->unused_syms
+ mod
->num_unused_syms
,
335 NOT_GPL_ONLY
, true },
336 { mod
->unused_gpl_syms
,
337 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
338 mod
->unused_gpl_crcs
,
343 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
348 EXPORT_SYMBOL_GPL(each_symbol_section
);
350 struct find_symbol_arg
{
357 struct module
*owner
;
358 const unsigned long *crc
;
359 const struct kernel_symbol
*sym
;
362 static bool check_symbol(const struct symsearch
*syms
,
363 struct module
*owner
,
364 unsigned int symnum
, void *data
)
366 struct find_symbol_arg
*fsa
= data
;
369 if (syms
->licence
== GPL_ONLY
)
371 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
372 printk(KERN_WARNING
"Symbol %s is being used "
373 "by a non-GPL module, which will not "
374 "be allowed in the future\n", fsa
->name
);
378 #ifdef CONFIG_UNUSED_SYMBOLS
379 if (syms
->unused
&& fsa
->warn
) {
380 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
381 "however this module is using it.\n", fsa
->name
);
383 "This symbol will go away in the future.\n");
385 "Please evalute if this is the right api to use and if "
386 "it really is, submit a report the linux kernel "
387 "mailinglist together with submitting your code for "
393 fsa
->crc
= symversion(syms
->crcs
, symnum
);
394 fsa
->sym
= &syms
->start
[symnum
];
398 static int cmp_name(const void *va
, const void *vb
)
401 const struct kernel_symbol
*b
;
403 return strcmp(a
, b
->name
);
406 static bool find_symbol_in_section(const struct symsearch
*syms
,
407 struct module
*owner
,
410 struct find_symbol_arg
*fsa
= data
;
411 struct kernel_symbol
*sym
;
413 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
414 sizeof(struct kernel_symbol
), cmp_name
);
416 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
422 /* Find a symbol and return it, along with, (optional) crc and
423 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
424 const struct kernel_symbol
*find_symbol(const char *name
,
425 struct module
**owner
,
426 const unsigned long **crc
,
430 struct find_symbol_arg fsa
;
436 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
444 pr_debug("Failed to find symbol %s\n", name
);
447 EXPORT_SYMBOL_GPL(find_symbol
);
449 /* Search for module by name: must hold module_mutex. */
450 struct module
*find_module(const char *name
)
454 list_for_each_entry(mod
, &modules
, list
) {
455 if (strcmp(mod
->name
, name
) == 0)
460 EXPORT_SYMBOL_GPL(find_module
);
464 static inline void __percpu
*mod_percpu(struct module
*mod
)
469 static int percpu_modalloc(struct module
*mod
,
470 unsigned long size
, unsigned long align
)
472 if (align
> PAGE_SIZE
) {
473 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
474 mod
->name
, align
, PAGE_SIZE
);
478 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
481 "%s: Could not allocate %lu bytes percpu data\n",
485 mod
->percpu_size
= size
;
489 static void percpu_modfree(struct module
*mod
)
491 free_percpu(mod
->percpu
);
494 static unsigned int find_pcpusec(struct load_info
*info
)
496 return find_sec(info
, ".data..percpu");
499 static void percpu_modcopy(struct module
*mod
,
500 const void *from
, unsigned long size
)
504 for_each_possible_cpu(cpu
)
505 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
509 * is_module_percpu_address - test whether address is from module static percpu
510 * @addr: address to test
512 * Test whether @addr belongs to module static percpu area.
515 * %true if @addr is from module static percpu area
517 bool is_module_percpu_address(unsigned long addr
)
524 list_for_each_entry_rcu(mod
, &modules
, list
) {
525 if (!mod
->percpu_size
)
527 for_each_possible_cpu(cpu
) {
528 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
530 if ((void *)addr
>= start
&&
531 (void *)addr
< start
+ mod
->percpu_size
) {
542 #else /* ... !CONFIG_SMP */
544 static inline void __percpu
*mod_percpu(struct module
*mod
)
548 static inline int percpu_modalloc(struct module
*mod
,
549 unsigned long size
, unsigned long align
)
553 static inline void percpu_modfree(struct module
*mod
)
556 static unsigned int find_pcpusec(struct load_info
*info
)
560 static inline void percpu_modcopy(struct module
*mod
,
561 const void *from
, unsigned long size
)
563 /* pcpusec should be 0, and size of that section should be 0. */
566 bool is_module_percpu_address(unsigned long addr
)
571 #endif /* CONFIG_SMP */
573 #define MODINFO_ATTR(field) \
574 static void setup_modinfo_##field(struct module *mod, const char *s) \
576 mod->field = kstrdup(s, GFP_KERNEL); \
578 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
579 struct module_kobject *mk, char *buffer) \
581 return sprintf(buffer, "%s\n", mk->mod->field); \
583 static int modinfo_##field##_exists(struct module *mod) \
585 return mod->field != NULL; \
587 static void free_modinfo_##field(struct module *mod) \
592 static struct module_attribute modinfo_##field = { \
593 .attr = { .name = __stringify(field), .mode = 0444 }, \
594 .show = show_modinfo_##field, \
595 .setup = setup_modinfo_##field, \
596 .test = modinfo_##field##_exists, \
597 .free = free_modinfo_##field, \
600 MODINFO_ATTR(version
);
601 MODINFO_ATTR(srcversion
);
603 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
605 #ifdef CONFIG_MODULE_UNLOAD
607 EXPORT_TRACEPOINT_SYMBOL(module_get
);
609 /* Init the unload section of the module. */
610 static int module_unload_init(struct module
*mod
)
612 mod
->refptr
= alloc_percpu(struct module_ref
);
616 INIT_LIST_HEAD(&mod
->source_list
);
617 INIT_LIST_HEAD(&mod
->target_list
);
619 /* Hold reference count during initialization. */
620 __this_cpu_write(mod
->refptr
->incs
, 1);
621 /* Backwards compatibility macros put refcount during init. */
622 mod
->waiter
= current
;
627 /* Does a already use b? */
628 static int already_uses(struct module
*a
, struct module
*b
)
630 struct module_use
*use
;
632 list_for_each_entry(use
, &b
->source_list
, source_list
) {
633 if (use
->source
== a
) {
634 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
638 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
644 * - we add 'a' as a "source", 'b' as a "target" of module use
645 * - the module_use is added to the list of 'b' sources (so
646 * 'b' can walk the list to see who sourced them), and of 'a'
647 * targets (so 'a' can see what modules it targets).
649 static int add_module_usage(struct module
*a
, struct module
*b
)
651 struct module_use
*use
;
653 pr_debug("Allocating new usage for %s.\n", a
->name
);
654 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
656 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
662 list_add(&use
->source_list
, &b
->source_list
);
663 list_add(&use
->target_list
, &a
->target_list
);
667 /* Module a uses b: caller needs module_mutex() */
668 int ref_module(struct module
*a
, struct module
*b
)
672 if (b
== NULL
|| already_uses(a
, b
))
675 /* If module isn't available, we fail. */
676 err
= strong_try_module_get(b
);
680 err
= add_module_usage(a
, b
);
687 EXPORT_SYMBOL_GPL(ref_module
);
689 /* Clear the unload stuff of the module. */
690 static void module_unload_free(struct module
*mod
)
692 struct module_use
*use
, *tmp
;
694 mutex_lock(&module_mutex
);
695 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
696 struct module
*i
= use
->target
;
697 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
699 list_del(&use
->source_list
);
700 list_del(&use
->target_list
);
703 mutex_unlock(&module_mutex
);
705 free_percpu(mod
->refptr
);
708 #ifdef CONFIG_MODULE_FORCE_UNLOAD
709 static inline int try_force_unload(unsigned int flags
)
711 int ret
= (flags
& O_TRUNC
);
713 add_taint(TAINT_FORCED_RMMOD
);
717 static inline int try_force_unload(unsigned int flags
)
721 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
730 /* Whole machine is stopped with interrupts off when this runs. */
731 static int __try_stop_module(void *_sref
)
733 struct stopref
*sref
= _sref
;
735 /* If it's not unused, quit unless we're forcing. */
736 if (module_refcount(sref
->mod
) != 0) {
737 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
741 /* Mark it as dying. */
742 sref
->mod
->state
= MODULE_STATE_GOING
;
746 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
748 if (flags
& O_NONBLOCK
) {
749 struct stopref sref
= { mod
, flags
, forced
};
751 return stop_machine(__try_stop_module
, &sref
, NULL
);
753 /* We don't need to stop the machine for this. */
754 mod
->state
= MODULE_STATE_GOING
;
760 unsigned long module_refcount(struct module
*mod
)
762 unsigned long incs
= 0, decs
= 0;
765 for_each_possible_cpu(cpu
)
766 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
768 * ensure the incs are added up after the decs.
769 * module_put ensures incs are visible before decs with smp_wmb.
771 * This 2-count scheme avoids the situation where the refcount
772 * for CPU0 is read, then CPU0 increments the module refcount,
773 * then CPU1 drops that refcount, then the refcount for CPU1 is
774 * read. We would record a decrement but not its corresponding
775 * increment so we would see a low count (disaster).
777 * Rare situation? But module_refcount can be preempted, and we
778 * might be tallying up 4096+ CPUs. So it is not impossible.
781 for_each_possible_cpu(cpu
)
782 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
785 EXPORT_SYMBOL(module_refcount
);
787 /* This exists whether we can unload or not */
788 static void free_module(struct module
*mod
);
790 static void wait_for_zero_refcount(struct module
*mod
)
792 /* Since we might sleep for some time, release the mutex first */
793 mutex_unlock(&module_mutex
);
795 pr_debug("Looking at refcount...\n");
796 set_current_state(TASK_UNINTERRUPTIBLE
);
797 if (module_refcount(mod
) == 0)
801 current
->state
= TASK_RUNNING
;
802 mutex_lock(&module_mutex
);
805 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
809 char name
[MODULE_NAME_LEN
];
812 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
815 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
817 name
[MODULE_NAME_LEN
-1] = '\0';
819 if (mutex_lock_interruptible(&module_mutex
) != 0)
822 mod
= find_module(name
);
828 if (!list_empty(&mod
->source_list
)) {
829 /* Other modules depend on us: get rid of them first. */
834 /* Doing init or already dying? */
835 if (mod
->state
!= MODULE_STATE_LIVE
) {
836 /* FIXME: if (force), slam module count and wake up
838 pr_debug("%s already dying\n", mod
->name
);
843 /* If it has an init func, it must have an exit func to unload */
844 if (mod
->init
&& !mod
->exit
) {
845 forced
= try_force_unload(flags
);
847 /* This module can't be removed */
853 /* Set this up before setting mod->state */
854 mod
->waiter
= current
;
856 /* Stop the machine so refcounts can't move and disable module. */
857 ret
= try_stop_module(mod
, flags
, &forced
);
861 /* Never wait if forced. */
862 if (!forced
&& module_refcount(mod
) != 0)
863 wait_for_zero_refcount(mod
);
865 mutex_unlock(&module_mutex
);
866 /* Final destruction now no one is using it. */
867 if (mod
->exit
!= NULL
)
869 blocking_notifier_call_chain(&module_notify_list
,
870 MODULE_STATE_GOING
, mod
);
871 async_synchronize_full();
873 /* Store the name of the last unloaded module for diagnostic purposes */
874 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
879 mutex_unlock(&module_mutex
);
883 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
885 struct module_use
*use
;
886 int printed_something
= 0;
888 seq_printf(m
, " %lu ", module_refcount(mod
));
890 /* Always include a trailing , so userspace can differentiate
891 between this and the old multi-field proc format. */
892 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
893 printed_something
= 1;
894 seq_printf(m
, "%s,", use
->source
->name
);
897 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
898 printed_something
= 1;
899 seq_printf(m
, "[permanent],");
902 if (!printed_something
)
906 void __symbol_put(const char *symbol
)
908 struct module
*owner
;
911 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
916 EXPORT_SYMBOL(__symbol_put
);
918 /* Note this assumes addr is a function, which it currently always is. */
919 void symbol_put_addr(void *addr
)
921 struct module
*modaddr
;
922 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
924 if (core_kernel_text(a
))
927 /* module_text_address is safe here: we're supposed to have reference
928 * to module from symbol_get, so it can't go away. */
929 modaddr
= __module_text_address(a
);
933 EXPORT_SYMBOL_GPL(symbol_put_addr
);
935 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
936 struct module_kobject
*mk
, char *buffer
)
938 return sprintf(buffer
, "%lu\n", module_refcount(mk
->mod
));
941 static struct module_attribute modinfo_refcnt
=
942 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
944 void __module_get(struct module
*module
)
948 __this_cpu_inc(module
->refptr
->incs
);
949 trace_module_get(module
, _RET_IP_
);
953 EXPORT_SYMBOL(__module_get
);
955 bool try_module_get(struct module
*module
)
962 if (likely(module_is_live(module
))) {
963 __this_cpu_inc(module
->refptr
->incs
);
964 trace_module_get(module
, _RET_IP_
);
972 EXPORT_SYMBOL(try_module_get
);
974 void module_put(struct module
*module
)
978 smp_wmb(); /* see comment in module_refcount */
979 __this_cpu_inc(module
->refptr
->decs
);
981 trace_module_put(module
, _RET_IP_
);
982 /* Maybe they're waiting for us to drop reference? */
983 if (unlikely(!module_is_live(module
)))
984 wake_up_process(module
->waiter
);
988 EXPORT_SYMBOL(module_put
);
990 #else /* !CONFIG_MODULE_UNLOAD */
991 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
993 /* We don't know the usage count, or what modules are using. */
994 seq_printf(m
, " - -");
997 static inline void module_unload_free(struct module
*mod
)
1001 int ref_module(struct module
*a
, struct module
*b
)
1003 return strong_try_module_get(b
);
1005 EXPORT_SYMBOL_GPL(ref_module
);
1007 static inline int module_unload_init(struct module
*mod
)
1011 #endif /* CONFIG_MODULE_UNLOAD */
1013 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1017 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1019 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1021 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1023 if (mod
->taints
& (1 << TAINT_CRAP
))
1026 * TAINT_FORCED_RMMOD: could be added.
1027 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1033 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1034 struct module_kobject
*mk
, char *buffer
)
1036 const char *state
= "unknown";
1038 switch (mk
->mod
->state
) {
1039 case MODULE_STATE_LIVE
:
1042 case MODULE_STATE_COMING
:
1045 case MODULE_STATE_GOING
:
1049 return sprintf(buffer
, "%s\n", state
);
1052 static struct module_attribute modinfo_initstate
=
1053 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1055 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1056 struct module_kobject
*mk
,
1057 const char *buffer
, size_t count
)
1059 enum kobject_action action
;
1061 if (kobject_action_type(buffer
, count
, &action
) == 0)
1062 kobject_uevent(&mk
->kobj
, action
);
1066 struct module_attribute module_uevent
=
1067 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1069 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1070 struct module_kobject
*mk
, char *buffer
)
1072 return sprintf(buffer
, "%u\n", mk
->mod
->core_size
);
1075 static struct module_attribute modinfo_coresize
=
1076 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1078 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1079 struct module_kobject
*mk
, char *buffer
)
1081 return sprintf(buffer
, "%u\n", mk
->mod
->init_size
);
1084 static struct module_attribute modinfo_initsize
=
1085 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1087 static ssize_t
show_taint(struct module_attribute
*mattr
,
1088 struct module_kobject
*mk
, char *buffer
)
1092 l
= module_flags_taint(mk
->mod
, buffer
);
1097 static struct module_attribute modinfo_taint
=
1098 __ATTR(taint
, 0444, show_taint
, NULL
);
1100 static struct module_attribute
*modinfo_attrs
[] = {
1103 &modinfo_srcversion
,
1108 #ifdef CONFIG_MODULE_UNLOAD
1114 static const char vermagic
[] = VERMAGIC_STRING
;
1116 static int try_to_force_load(struct module
*mod
, const char *reason
)
1118 #ifdef CONFIG_MODULE_FORCE_LOAD
1119 if (!test_taint(TAINT_FORCED_MODULE
))
1120 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
1122 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1129 #ifdef CONFIG_MODVERSIONS
1130 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1131 static unsigned long maybe_relocated(unsigned long crc
,
1132 const struct module
*crc_owner
)
1134 #ifdef ARCH_RELOCATES_KCRCTAB
1135 if (crc_owner
== NULL
)
1136 return crc
- (unsigned long)reloc_start
;
1141 static int check_version(Elf_Shdr
*sechdrs
,
1142 unsigned int versindex
,
1143 const char *symname
,
1145 const unsigned long *crc
,
1146 const struct module
*crc_owner
)
1148 unsigned int i
, num_versions
;
1149 struct modversion_info
*versions
;
1151 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1155 /* No versions at all? modprobe --force does this. */
1157 return try_to_force_load(mod
, symname
) == 0;
1159 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1160 num_versions
= sechdrs
[versindex
].sh_size
1161 / sizeof(struct modversion_info
);
1163 for (i
= 0; i
< num_versions
; i
++) {
1164 if (strcmp(versions
[i
].name
, symname
) != 0)
1167 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1169 pr_debug("Found checksum %lX vs module %lX\n",
1170 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1174 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1175 mod
->name
, symname
);
1179 printk("%s: disagrees about version of symbol %s\n",
1180 mod
->name
, symname
);
1184 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1185 unsigned int versindex
,
1188 const unsigned long *crc
;
1190 /* Since this should be found in kernel (which can't be removed),
1191 * no locking is necessary. */
1192 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1195 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1199 /* First part is kernel version, which we ignore if module has crcs. */
1200 static inline int same_magic(const char *amagic
, const char *bmagic
,
1204 amagic
+= strcspn(amagic
, " ");
1205 bmagic
+= strcspn(bmagic
, " ");
1207 return strcmp(amagic
, bmagic
) == 0;
1210 static inline int check_version(Elf_Shdr
*sechdrs
,
1211 unsigned int versindex
,
1212 const char *symname
,
1214 const unsigned long *crc
,
1215 const struct module
*crc_owner
)
1220 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1221 unsigned int versindex
,
1227 static inline int same_magic(const char *amagic
, const char *bmagic
,
1230 return strcmp(amagic
, bmagic
) == 0;
1232 #endif /* CONFIG_MODVERSIONS */
1234 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1235 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1236 const struct load_info
*info
,
1240 struct module
*owner
;
1241 const struct kernel_symbol
*sym
;
1242 const unsigned long *crc
;
1245 mutex_lock(&module_mutex
);
1246 sym
= find_symbol(name
, &owner
, &crc
,
1247 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1251 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1253 sym
= ERR_PTR(-EINVAL
);
1257 err
= ref_module(mod
, owner
);
1264 /* We must make copy under the lock if we failed to get ref. */
1265 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1267 mutex_unlock(&module_mutex
);
1271 static const struct kernel_symbol
*
1272 resolve_symbol_wait(struct module
*mod
,
1273 const struct load_info
*info
,
1276 const struct kernel_symbol
*ksym
;
1277 char owner
[MODULE_NAME_LEN
];
1279 if (wait_event_interruptible_timeout(module_wq
,
1280 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1281 || PTR_ERR(ksym
) != -EBUSY
,
1283 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1290 * /sys/module/foo/sections stuff
1291 * J. Corbet <corbet@lwn.net>
1295 #ifdef CONFIG_KALLSYMS
1296 static inline bool sect_empty(const Elf_Shdr
*sect
)
1298 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1301 struct module_sect_attr
1303 struct module_attribute mattr
;
1305 unsigned long address
;
1308 struct module_sect_attrs
1310 struct attribute_group grp
;
1311 unsigned int nsections
;
1312 struct module_sect_attr attrs
[0];
1315 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1316 struct module_kobject
*mk
, char *buf
)
1318 struct module_sect_attr
*sattr
=
1319 container_of(mattr
, struct module_sect_attr
, mattr
);
1320 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1323 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1325 unsigned int section
;
1327 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1328 kfree(sect_attrs
->attrs
[section
].name
);
1332 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1334 unsigned int nloaded
= 0, i
, size
[2];
1335 struct module_sect_attrs
*sect_attrs
;
1336 struct module_sect_attr
*sattr
;
1337 struct attribute
**gattr
;
1339 /* Count loaded sections and allocate structures */
1340 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1341 if (!sect_empty(&info
->sechdrs
[i
]))
1343 size
[0] = ALIGN(sizeof(*sect_attrs
)
1344 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1345 sizeof(sect_attrs
->grp
.attrs
[0]));
1346 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1347 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1348 if (sect_attrs
== NULL
)
1351 /* Setup section attributes. */
1352 sect_attrs
->grp
.name
= "sections";
1353 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1355 sect_attrs
->nsections
= 0;
1356 sattr
= §_attrs
->attrs
[0];
1357 gattr
= §_attrs
->grp
.attrs
[0];
1358 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1359 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1360 if (sect_empty(sec
))
1362 sattr
->address
= sec
->sh_addr
;
1363 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1365 if (sattr
->name
== NULL
)
1367 sect_attrs
->nsections
++;
1368 sysfs_attr_init(&sattr
->mattr
.attr
);
1369 sattr
->mattr
.show
= module_sect_show
;
1370 sattr
->mattr
.store
= NULL
;
1371 sattr
->mattr
.attr
.name
= sattr
->name
;
1372 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1373 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1377 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1380 mod
->sect_attrs
= sect_attrs
;
1383 free_sect_attrs(sect_attrs
);
1386 static void remove_sect_attrs(struct module
*mod
)
1388 if (mod
->sect_attrs
) {
1389 sysfs_remove_group(&mod
->mkobj
.kobj
,
1390 &mod
->sect_attrs
->grp
);
1391 /* We are positive that no one is using any sect attrs
1392 * at this point. Deallocate immediately. */
1393 free_sect_attrs(mod
->sect_attrs
);
1394 mod
->sect_attrs
= NULL
;
1399 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1402 struct module_notes_attrs
{
1403 struct kobject
*dir
;
1405 struct bin_attribute attrs
[0];
1408 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1409 struct bin_attribute
*bin_attr
,
1410 char *buf
, loff_t pos
, size_t count
)
1413 * The caller checked the pos and count against our size.
1415 memcpy(buf
, bin_attr
->private + pos
, count
);
1419 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1422 if (notes_attrs
->dir
) {
1424 sysfs_remove_bin_file(notes_attrs
->dir
,
1425 ¬es_attrs
->attrs
[i
]);
1426 kobject_put(notes_attrs
->dir
);
1431 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1433 unsigned int notes
, loaded
, i
;
1434 struct module_notes_attrs
*notes_attrs
;
1435 struct bin_attribute
*nattr
;
1437 /* failed to create section attributes, so can't create notes */
1438 if (!mod
->sect_attrs
)
1441 /* Count notes sections and allocate structures. */
1443 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1444 if (!sect_empty(&info
->sechdrs
[i
]) &&
1445 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1451 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1452 + notes
* sizeof(notes_attrs
->attrs
[0]),
1454 if (notes_attrs
== NULL
)
1457 notes_attrs
->notes
= notes
;
1458 nattr
= ¬es_attrs
->attrs
[0];
1459 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1460 if (sect_empty(&info
->sechdrs
[i
]))
1462 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1463 sysfs_bin_attr_init(nattr
);
1464 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1465 nattr
->attr
.mode
= S_IRUGO
;
1466 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1467 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1468 nattr
->read
= module_notes_read
;
1474 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1475 if (!notes_attrs
->dir
)
1478 for (i
= 0; i
< notes
; ++i
)
1479 if (sysfs_create_bin_file(notes_attrs
->dir
,
1480 ¬es_attrs
->attrs
[i
]))
1483 mod
->notes_attrs
= notes_attrs
;
1487 free_notes_attrs(notes_attrs
, i
);
1490 static void remove_notes_attrs(struct module
*mod
)
1492 if (mod
->notes_attrs
)
1493 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1498 static inline void add_sect_attrs(struct module
*mod
,
1499 const struct load_info
*info
)
1503 static inline void remove_sect_attrs(struct module
*mod
)
1507 static inline void add_notes_attrs(struct module
*mod
,
1508 const struct load_info
*info
)
1512 static inline void remove_notes_attrs(struct module
*mod
)
1515 #endif /* CONFIG_KALLSYMS */
1517 static void add_usage_links(struct module
*mod
)
1519 #ifdef CONFIG_MODULE_UNLOAD
1520 struct module_use
*use
;
1523 mutex_lock(&module_mutex
);
1524 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1525 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1526 &mod
->mkobj
.kobj
, mod
->name
);
1528 mutex_unlock(&module_mutex
);
1532 static void del_usage_links(struct module
*mod
)
1534 #ifdef CONFIG_MODULE_UNLOAD
1535 struct module_use
*use
;
1537 mutex_lock(&module_mutex
);
1538 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1539 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1540 mutex_unlock(&module_mutex
);
1544 static int module_add_modinfo_attrs(struct module
*mod
)
1546 struct module_attribute
*attr
;
1547 struct module_attribute
*temp_attr
;
1551 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1552 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1554 if (!mod
->modinfo_attrs
)
1557 temp_attr
= mod
->modinfo_attrs
;
1558 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1560 (attr
->test
&& attr
->test(mod
))) {
1561 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1562 sysfs_attr_init(&temp_attr
->attr
);
1563 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1570 static void module_remove_modinfo_attrs(struct module
*mod
)
1572 struct module_attribute
*attr
;
1575 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1576 /* pick a field to test for end of list */
1577 if (!attr
->attr
.name
)
1579 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1583 kfree(mod
->modinfo_attrs
);
1586 static int mod_sysfs_init(struct module
*mod
)
1589 struct kobject
*kobj
;
1591 if (!module_sysfs_initialized
) {
1592 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1598 kobj
= kset_find_obj(module_kset
, mod
->name
);
1600 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1606 mod
->mkobj
.mod
= mod
;
1608 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1609 mod
->mkobj
.kobj
.kset
= module_kset
;
1610 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1613 kobject_put(&mod
->mkobj
.kobj
);
1615 /* delay uevent until full sysfs population */
1620 static int mod_sysfs_setup(struct module
*mod
,
1621 const struct load_info
*info
,
1622 struct kernel_param
*kparam
,
1623 unsigned int num_params
)
1627 err
= mod_sysfs_init(mod
);
1631 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1632 if (!mod
->holders_dir
) {
1637 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1639 goto out_unreg_holders
;
1641 err
= module_add_modinfo_attrs(mod
);
1643 goto out_unreg_param
;
1645 add_usage_links(mod
);
1646 add_sect_attrs(mod
, info
);
1647 add_notes_attrs(mod
, info
);
1649 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1653 module_param_sysfs_remove(mod
);
1655 kobject_put(mod
->holders_dir
);
1657 kobject_put(&mod
->mkobj
.kobj
);
1662 static void mod_sysfs_fini(struct module
*mod
)
1664 remove_notes_attrs(mod
);
1665 remove_sect_attrs(mod
);
1666 kobject_put(&mod
->mkobj
.kobj
);
1669 #else /* !CONFIG_SYSFS */
1671 static int mod_sysfs_setup(struct module
*mod
,
1672 const struct load_info
*info
,
1673 struct kernel_param
*kparam
,
1674 unsigned int num_params
)
1679 static void mod_sysfs_fini(struct module
*mod
)
1683 static void module_remove_modinfo_attrs(struct module
*mod
)
1687 static void del_usage_links(struct module
*mod
)
1691 #endif /* CONFIG_SYSFS */
1693 static void mod_sysfs_teardown(struct module
*mod
)
1695 del_usage_links(mod
);
1696 module_remove_modinfo_attrs(mod
);
1697 module_param_sysfs_remove(mod
);
1698 kobject_put(mod
->mkobj
.drivers_dir
);
1699 kobject_put(mod
->holders_dir
);
1700 mod_sysfs_fini(mod
);
1704 * unlink the module with the whole machine is stopped with interrupts off
1705 * - this defends against kallsyms not taking locks
1707 static int __unlink_module(void *_mod
)
1709 struct module
*mod
= _mod
;
1710 list_del(&mod
->list
);
1711 module_bug_cleanup(mod
);
1715 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1717 * LKM RO/NX protection: protect module's text/ro-data
1718 * from modification and any data from execution.
1720 void set_page_attributes(void *start
, void *end
, int (*set
)(unsigned long start
, int num_pages
))
1722 unsigned long begin_pfn
= PFN_DOWN((unsigned long)start
);
1723 unsigned long end_pfn
= PFN_DOWN((unsigned long)end
);
1725 if (end_pfn
> begin_pfn
)
1726 set(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1729 static void set_section_ro_nx(void *base
,
1730 unsigned long text_size
,
1731 unsigned long ro_size
,
1732 unsigned long total_size
)
1734 /* begin and end PFNs of the current subsection */
1735 unsigned long begin_pfn
;
1736 unsigned long end_pfn
;
1739 * Set RO for module text and RO-data:
1740 * - Always protect first page.
1741 * - Do not protect last partial page.
1744 set_page_attributes(base
, base
+ ro_size
, set_memory_ro
);
1747 * Set NX permissions for module data:
1748 * - Do not protect first partial page.
1749 * - Always protect last page.
1751 if (total_size
> text_size
) {
1752 begin_pfn
= PFN_UP((unsigned long)base
+ text_size
);
1753 end_pfn
= PFN_UP((unsigned long)base
+ total_size
);
1754 if (end_pfn
> begin_pfn
)
1755 set_memory_nx(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1759 static void unset_module_core_ro_nx(struct module
*mod
)
1761 set_page_attributes(mod
->module_core
+ mod
->core_text_size
,
1762 mod
->module_core
+ mod
->core_size
,
1764 set_page_attributes(mod
->module_core
,
1765 mod
->module_core
+ mod
->core_ro_size
,
1769 static void unset_module_init_ro_nx(struct module
*mod
)
1771 set_page_attributes(mod
->module_init
+ mod
->init_text_size
,
1772 mod
->module_init
+ mod
->init_size
,
1774 set_page_attributes(mod
->module_init
,
1775 mod
->module_init
+ mod
->init_ro_size
,
1779 /* Iterate through all modules and set each module's text as RW */
1780 void set_all_modules_text_rw(void)
1784 mutex_lock(&module_mutex
);
1785 list_for_each_entry_rcu(mod
, &modules
, list
) {
1786 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1787 set_page_attributes(mod
->module_core
,
1788 mod
->module_core
+ mod
->core_text_size
,
1791 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1792 set_page_attributes(mod
->module_init
,
1793 mod
->module_init
+ mod
->init_text_size
,
1797 mutex_unlock(&module_mutex
);
1800 /* Iterate through all modules and set each module's text as RO */
1801 void set_all_modules_text_ro(void)
1805 mutex_lock(&module_mutex
);
1806 list_for_each_entry_rcu(mod
, &modules
, list
) {
1807 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1808 set_page_attributes(mod
->module_core
,
1809 mod
->module_core
+ mod
->core_text_size
,
1812 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1813 set_page_attributes(mod
->module_init
,
1814 mod
->module_init
+ mod
->init_text_size
,
1818 mutex_unlock(&module_mutex
);
1821 static inline void set_section_ro_nx(void *base
, unsigned long text_size
, unsigned long ro_size
, unsigned long total_size
) { }
1822 static void unset_module_core_ro_nx(struct module
*mod
) { }
1823 static void unset_module_init_ro_nx(struct module
*mod
) { }
1826 void __weak
module_free(struct module
*mod
, void *module_region
)
1828 vfree(module_region
);
1831 void __weak
module_arch_cleanup(struct module
*mod
)
1835 /* Free a module, remove from lists, etc. */
1836 static void free_module(struct module
*mod
)
1838 trace_module_free(mod
);
1840 /* Delete from various lists */
1841 mutex_lock(&module_mutex
);
1842 stop_machine(__unlink_module
, mod
, NULL
);
1843 mutex_unlock(&module_mutex
);
1844 mod_sysfs_teardown(mod
);
1846 /* Remove dynamic debug info */
1847 ddebug_remove_module(mod
->name
);
1849 /* Arch-specific cleanup. */
1850 module_arch_cleanup(mod
);
1852 /* Module unload stuff */
1853 module_unload_free(mod
);
1855 /* Free any allocated parameters. */
1856 destroy_params(mod
->kp
, mod
->num_kp
);
1858 /* This may be NULL, but that's OK */
1859 unset_module_init_ro_nx(mod
);
1860 module_free(mod
, mod
->module_init
);
1862 percpu_modfree(mod
);
1864 /* Free lock-classes: */
1865 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1867 /* Finally, free the core (containing the module structure) */
1868 unset_module_core_ro_nx(mod
);
1869 module_free(mod
, mod
->module_core
);
1872 update_protections(current
->mm
);
1876 void *__symbol_get(const char *symbol
)
1878 struct module
*owner
;
1879 const struct kernel_symbol
*sym
;
1882 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1883 if (sym
&& strong_try_module_get(owner
))
1887 return sym
? (void *)sym
->value
: NULL
;
1889 EXPORT_SYMBOL_GPL(__symbol_get
);
1892 * Ensure that an exported symbol [global namespace] does not already exist
1893 * in the kernel or in some other module's exported symbol table.
1895 * You must hold the module_mutex.
1897 static int verify_export_symbols(struct module
*mod
)
1900 struct module
*owner
;
1901 const struct kernel_symbol
*s
;
1903 const struct kernel_symbol
*sym
;
1906 { mod
->syms
, mod
->num_syms
},
1907 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1908 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1909 #ifdef CONFIG_UNUSED_SYMBOLS
1910 { mod
->unused_syms
, mod
->num_unused_syms
},
1911 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1915 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1916 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1917 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1919 "%s: exports duplicate symbol %s"
1921 mod
->name
, s
->name
, module_name(owner
));
1929 /* Change all symbols so that st_value encodes the pointer directly. */
1930 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
1932 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
1933 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
1934 unsigned long secbase
;
1937 const struct kernel_symbol
*ksym
;
1939 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
1940 const char *name
= info
->strtab
+ sym
[i
].st_name
;
1942 switch (sym
[i
].st_shndx
) {
1944 /* We compiled with -fno-common. These are not
1945 supposed to happen. */
1946 pr_debug("Common symbol: %s\n", name
);
1947 printk("%s: please compile with -fno-common\n",
1953 /* Don't need to do anything */
1954 pr_debug("Absolute symbol: 0x%08lx\n",
1955 (long)sym
[i
].st_value
);
1959 ksym
= resolve_symbol_wait(mod
, info
, name
);
1960 /* Ok if resolved. */
1961 if (ksym
&& !IS_ERR(ksym
)) {
1962 sym
[i
].st_value
= ksym
->value
;
1967 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1970 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
1971 mod
->name
, name
, PTR_ERR(ksym
));
1972 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
1976 /* Divert to percpu allocation if a percpu var. */
1977 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
1978 secbase
= (unsigned long)mod_percpu(mod
);
1980 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1981 sym
[i
].st_value
+= secbase
;
1989 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
1994 /* Now do relocations. */
1995 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
1996 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
1998 /* Not a valid relocation section? */
1999 if (infosec
>= info
->hdr
->e_shnum
)
2002 /* Don't bother with non-allocated sections */
2003 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2006 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2007 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2008 info
->index
.sym
, i
, mod
);
2009 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2010 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2011 info
->index
.sym
, i
, mod
);
2018 /* Additional bytes needed by arch in front of individual sections */
2019 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2020 unsigned int section
)
2022 /* default implementation just returns zero */
2026 /* Update size with this section: return offset. */
2027 static long get_offset(struct module
*mod
, unsigned int *size
,
2028 Elf_Shdr
*sechdr
, unsigned int section
)
2032 *size
+= arch_mod_section_prepend(mod
, section
);
2033 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2034 *size
= ret
+ sechdr
->sh_size
;
2038 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2039 might -- code, read-only data, read-write data, small data. Tally
2040 sizes, and place the offsets into sh_entsize fields: high bit means it
2042 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2044 static unsigned long const masks
[][2] = {
2045 /* NOTE: all executable code must be the first section
2046 * in this array; otherwise modify the text_size
2047 * finder in the two loops below */
2048 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2049 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2050 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2051 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2055 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2056 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2058 pr_debug("Core section allocation order:\n");
2059 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2060 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2061 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2062 const char *sname
= info
->secstrings
+ s
->sh_name
;
2064 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2065 || (s
->sh_flags
& masks
[m
][1])
2066 || s
->sh_entsize
!= ~0UL
2067 || strstarts(sname
, ".init"))
2069 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
2070 pr_debug("\t%s\n", sname
);
2073 case 0: /* executable */
2074 mod
->core_size
= debug_align(mod
->core_size
);
2075 mod
->core_text_size
= mod
->core_size
;
2077 case 1: /* RO: text and ro-data */
2078 mod
->core_size
= debug_align(mod
->core_size
);
2079 mod
->core_ro_size
= mod
->core_size
;
2081 case 3: /* whole core */
2082 mod
->core_size
= debug_align(mod
->core_size
);
2087 pr_debug("Init section allocation order:\n");
2088 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2089 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2090 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2091 const char *sname
= info
->secstrings
+ s
->sh_name
;
2093 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2094 || (s
->sh_flags
& masks
[m
][1])
2095 || s
->sh_entsize
!= ~0UL
2096 || !strstarts(sname
, ".init"))
2098 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
2099 | INIT_OFFSET_MASK
);
2100 pr_debug("\t%s\n", sname
);
2103 case 0: /* executable */
2104 mod
->init_size
= debug_align(mod
->init_size
);
2105 mod
->init_text_size
= mod
->init_size
;
2107 case 1: /* RO: text and ro-data */
2108 mod
->init_size
= debug_align(mod
->init_size
);
2109 mod
->init_ro_size
= mod
->init_size
;
2111 case 3: /* whole init */
2112 mod
->init_size
= debug_align(mod
->init_size
);
2118 static void set_license(struct module
*mod
, const char *license
)
2121 license
= "unspecified";
2123 if (!license_is_gpl_compatible(license
)) {
2124 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2125 printk(KERN_WARNING
"%s: module license '%s' taints "
2126 "kernel.\n", mod
->name
, license
);
2127 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2131 /* Parse tag=value strings from .modinfo section */
2132 static char *next_string(char *string
, unsigned long *secsize
)
2134 /* Skip non-zero chars */
2137 if ((*secsize
)-- <= 1)
2141 /* Skip any zero padding. */
2142 while (!string
[0]) {
2144 if ((*secsize
)-- <= 1)
2150 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2153 unsigned int taglen
= strlen(tag
);
2154 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2155 unsigned long size
= infosec
->sh_size
;
2157 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2158 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2159 return p
+ taglen
+ 1;
2164 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2166 struct module_attribute
*attr
;
2169 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2171 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2175 static void free_modinfo(struct module
*mod
)
2177 struct module_attribute
*attr
;
2180 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2186 #ifdef CONFIG_KALLSYMS
2188 /* lookup symbol in given range of kernel_symbols */
2189 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2190 const struct kernel_symbol
*start
,
2191 const struct kernel_symbol
*stop
)
2193 return bsearch(name
, start
, stop
- start
,
2194 sizeof(struct kernel_symbol
), cmp_name
);
2197 static int is_exported(const char *name
, unsigned long value
,
2198 const struct module
*mod
)
2200 const struct kernel_symbol
*ks
;
2202 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2204 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2205 return ks
!= NULL
&& ks
->value
== value
;
2209 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2211 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2213 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2214 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2219 if (sym
->st_shndx
== SHN_UNDEF
)
2221 if (sym
->st_shndx
== SHN_ABS
)
2223 if (sym
->st_shndx
>= SHN_LORESERVE
)
2225 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2227 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2228 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2229 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2231 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2236 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2237 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2242 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2249 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2252 const Elf_Shdr
*sec
;
2254 if (src
->st_shndx
== SHN_UNDEF
2255 || src
->st_shndx
>= shnum
2259 sec
= sechdrs
+ src
->st_shndx
;
2260 if (!(sec
->sh_flags
& SHF_ALLOC
)
2261 #ifndef CONFIG_KALLSYMS_ALL
2262 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2264 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2271 * We only allocate and copy the strings needed by the parts of symtab
2272 * we keep. This is simple, but has the effect of making multiple
2273 * copies of duplicates. We could be more sophisticated, see
2274 * linux-kernel thread starting with
2275 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2277 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2279 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2280 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2282 unsigned int i
, nsrc
, ndst
, strtab_size
;
2284 /* Put symbol section at end of init part of module. */
2285 symsect
->sh_flags
|= SHF_ALLOC
;
2286 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
2287 info
->index
.sym
) | INIT_OFFSET_MASK
;
2288 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2290 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2291 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2293 /* strtab always starts with a nul, so offset 0 is the empty string. */
2296 /* Compute total space required for the core symbols' strtab. */
2297 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2299 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2300 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2305 /* Append room for core symbols at end of core part. */
2306 info
->symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
2307 info
->stroffs
= mod
->core_size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2308 mod
->core_size
+= strtab_size
;
2310 /* Put string table section at end of init part of module. */
2311 strsect
->sh_flags
|= SHF_ALLOC
;
2312 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
2313 info
->index
.str
) | INIT_OFFSET_MASK
;
2314 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2317 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2319 unsigned int i
, ndst
;
2323 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2325 mod
->symtab
= (void *)symsec
->sh_addr
;
2326 mod
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2327 /* Make sure we get permanent strtab: don't use info->strtab. */
2328 mod
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2330 /* Set types up while we still have access to sections. */
2331 for (i
= 0; i
< mod
->num_symtab
; i
++)
2332 mod
->symtab
[i
].st_info
= elf_type(&mod
->symtab
[i
], info
);
2334 mod
->core_symtab
= dst
= mod
->module_core
+ info
->symoffs
;
2335 mod
->core_strtab
= s
= mod
->module_core
+ info
->stroffs
;
2338 for (ndst
= i
= 0; i
< mod
->num_symtab
; i
++) {
2340 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2342 dst
[ndst
++].st_name
= s
- mod
->core_strtab
;
2343 s
+= strlcpy(s
, &mod
->strtab
[src
[i
].st_name
],
2347 mod
->core_num_syms
= ndst
;
2350 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2354 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2357 #endif /* CONFIG_KALLSYMS */
2359 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2363 #ifdef CONFIG_DYNAMIC_DEBUG
2364 if (ddebug_add_module(debug
, num
, debug
->modname
))
2365 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2370 static void dynamic_debug_remove(struct _ddebug
*debug
)
2373 ddebug_remove_module(debug
->modname
);
2376 void * __weak
module_alloc(unsigned long size
)
2378 return size
== 0 ? NULL
: vmalloc_exec(size
);
2381 static void *module_alloc_update_bounds(unsigned long size
)
2383 void *ret
= module_alloc(size
);
2386 mutex_lock(&module_mutex
);
2387 /* Update module bounds. */
2388 if ((unsigned long)ret
< module_addr_min
)
2389 module_addr_min
= (unsigned long)ret
;
2390 if ((unsigned long)ret
+ size
> module_addr_max
)
2391 module_addr_max
= (unsigned long)ret
+ size
;
2392 mutex_unlock(&module_mutex
);
2397 #ifdef CONFIG_DEBUG_KMEMLEAK
2398 static void kmemleak_load_module(const struct module
*mod
,
2399 const struct load_info
*info
)
2403 /* only scan the sections containing data */
2404 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2406 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2407 const char *name
= info
->secstrings
+ info
->sechdrs
[i
].sh_name
;
2408 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2410 if (!strstarts(name
, ".data") && !strstarts(name
, ".bss"))
2413 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2414 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2418 static inline void kmemleak_load_module(const struct module
*mod
,
2419 const struct load_info
*info
)
2424 #ifdef CONFIG_MODULE_SIG
2425 static int module_sig_check(struct load_info
*info
,
2426 const void *mod
, unsigned long *_len
)
2429 unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2430 unsigned long len
= *_len
;
2432 if (len
> markerlen
&&
2433 memcmp(mod
+ len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2434 /* We truncate the module to discard the signature */
2436 err
= mod_verify_sig(mod
, _len
);
2440 info
->sig_ok
= true;
2444 /* Not having a signature is only an error if we're strict. */
2445 if (err
< 0 && fips_enabled
)
2446 panic("Module verification failed with error %d in FIPS mode\n",
2448 if (err
== -ENOKEY
&& !sig_enforce
)
2453 #else /* !CONFIG_MODULE_SIG */
2454 static int module_sig_check(struct load_info
*info
,
2455 void *mod
, unsigned long *len
)
2459 #endif /* !CONFIG_MODULE_SIG */
2461 /* Sets info->hdr, info->len and info->sig_ok. */
2462 static int copy_and_check(struct load_info
*info
,
2463 const void __user
*umod
, unsigned long len
,
2464 const char __user
*uargs
)
2469 if (len
< sizeof(*hdr
))
2472 /* Suck in entire file: we'll want most of it. */
2473 if ((hdr
= vmalloc(len
)) == NULL
)
2476 if (copy_from_user(hdr
, umod
, len
) != 0) {
2481 err
= module_sig_check(info
, hdr
, &len
);
2485 /* Sanity checks against insmoding binaries or wrong arch,
2486 weird elf version */
2487 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2488 || hdr
->e_type
!= ET_REL
2489 || !elf_check_arch(hdr
)
2490 || hdr
->e_shentsize
!= sizeof(Elf_Shdr
)) {
2495 if (hdr
->e_shoff
>= len
||
2496 hdr
->e_shnum
* sizeof(Elf_Shdr
) > len
- hdr
->e_shoff
) {
2510 static void free_copy(struct load_info
*info
)
2515 static int rewrite_section_headers(struct load_info
*info
)
2519 /* This should always be true, but let's be sure. */
2520 info
->sechdrs
[0].sh_addr
= 0;
2522 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2523 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2524 if (shdr
->sh_type
!= SHT_NOBITS
2525 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2526 printk(KERN_ERR
"Module len %lu truncated\n",
2531 /* Mark all sections sh_addr with their address in the
2533 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2535 #ifndef CONFIG_MODULE_UNLOAD
2536 /* Don't load .exit sections */
2537 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2538 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2542 /* Track but don't keep modinfo and version sections. */
2543 info
->index
.vers
= find_sec(info
, "__versions");
2544 info
->index
.info
= find_sec(info
, ".modinfo");
2545 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2546 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2551 * Set up our basic convenience variables (pointers to section headers,
2552 * search for module section index etc), and do some basic section
2555 * Return the temporary module pointer (we'll replace it with the final
2556 * one when we move the module sections around).
2558 static struct module
*setup_load_info(struct load_info
*info
)
2564 /* Set up the convenience variables */
2565 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2566 info
->secstrings
= (void *)info
->hdr
2567 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2569 err
= rewrite_section_headers(info
);
2571 return ERR_PTR(err
);
2573 /* Find internal symbols and strings. */
2574 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2575 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2576 info
->index
.sym
= i
;
2577 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2578 info
->strtab
= (char *)info
->hdr
2579 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2584 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2585 if (!info
->index
.mod
) {
2586 printk(KERN_WARNING
"No module found in object\n");
2587 return ERR_PTR(-ENOEXEC
);
2589 /* This is temporary: point mod into copy of data. */
2590 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2592 if (info
->index
.sym
== 0) {
2593 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2595 return ERR_PTR(-ENOEXEC
);
2598 info
->index
.pcpu
= find_pcpusec(info
);
2600 /* Check module struct version now, before we try to use module. */
2601 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2602 return ERR_PTR(-ENOEXEC
);
2607 static int check_modinfo(struct module
*mod
, struct load_info
*info
)
2609 const char *modmagic
= get_modinfo(info
, "vermagic");
2612 /* This is allowed: modprobe --force will invalidate it. */
2614 err
= try_to_force_load(mod
, "bad vermagic");
2617 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2618 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2619 mod
->name
, modmagic
, vermagic
);
2623 if (!get_modinfo(info
, "intree"))
2624 add_taint_module(mod
, TAINT_OOT_MODULE
);
2626 if (get_modinfo(info
, "staging")) {
2627 add_taint_module(mod
, TAINT_CRAP
);
2628 printk(KERN_WARNING
"%s: module is from the staging directory,"
2629 " the quality is unknown, you have been warned.\n",
2633 /* Set up license info based on the info section */
2634 set_license(mod
, get_modinfo(info
, "license"));
2639 static void find_module_sections(struct module
*mod
, struct load_info
*info
)
2641 mod
->kp
= section_objs(info
, "__param",
2642 sizeof(*mod
->kp
), &mod
->num_kp
);
2643 mod
->syms
= section_objs(info
, "__ksymtab",
2644 sizeof(*mod
->syms
), &mod
->num_syms
);
2645 mod
->crcs
= section_addr(info
, "__kcrctab");
2646 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2647 sizeof(*mod
->gpl_syms
),
2648 &mod
->num_gpl_syms
);
2649 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2650 mod
->gpl_future_syms
= section_objs(info
,
2651 "__ksymtab_gpl_future",
2652 sizeof(*mod
->gpl_future_syms
),
2653 &mod
->num_gpl_future_syms
);
2654 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2656 #ifdef CONFIG_UNUSED_SYMBOLS
2657 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2658 sizeof(*mod
->unused_syms
),
2659 &mod
->num_unused_syms
);
2660 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2661 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2662 sizeof(*mod
->unused_gpl_syms
),
2663 &mod
->num_unused_gpl_syms
);
2664 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2666 #ifdef CONFIG_CONSTRUCTORS
2667 mod
->ctors
= section_objs(info
, ".ctors",
2668 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2671 #ifdef CONFIG_TRACEPOINTS
2672 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2673 sizeof(*mod
->tracepoints_ptrs
),
2674 &mod
->num_tracepoints
);
2676 #ifdef HAVE_JUMP_LABEL
2677 mod
->jump_entries
= section_objs(info
, "__jump_table",
2678 sizeof(*mod
->jump_entries
),
2679 &mod
->num_jump_entries
);
2681 #ifdef CONFIG_EVENT_TRACING
2682 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2683 sizeof(*mod
->trace_events
),
2684 &mod
->num_trace_events
);
2686 * This section contains pointers to allocated objects in the trace
2687 * code and not scanning it leads to false positives.
2689 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2690 mod
->num_trace_events
, GFP_KERNEL
);
2692 #ifdef CONFIG_TRACING
2693 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2694 sizeof(*mod
->trace_bprintk_fmt_start
),
2695 &mod
->num_trace_bprintk_fmt
);
2697 * This section contains pointers to allocated objects in the trace
2698 * code and not scanning it leads to false positives.
2700 kmemleak_scan_area(mod
->trace_bprintk_fmt_start
,
2701 sizeof(*mod
->trace_bprintk_fmt_start
) *
2702 mod
->num_trace_bprintk_fmt
, GFP_KERNEL
);
2704 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2705 /* sechdrs[0].sh_size is always zero */
2706 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2707 sizeof(*mod
->ftrace_callsites
),
2708 &mod
->num_ftrace_callsites
);
2711 mod
->extable
= section_objs(info
, "__ex_table",
2712 sizeof(*mod
->extable
), &mod
->num_exentries
);
2714 if (section_addr(info
, "__obsparm"))
2715 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2718 info
->debug
= section_objs(info
, "__verbose",
2719 sizeof(*info
->debug
), &info
->num_debug
);
2722 static int move_module(struct module
*mod
, struct load_info
*info
)
2727 /* Do the allocs. */
2728 ptr
= module_alloc_update_bounds(mod
->core_size
);
2730 * The pointer to this block is stored in the module structure
2731 * which is inside the block. Just mark it as not being a
2734 kmemleak_not_leak(ptr
);
2738 memset(ptr
, 0, mod
->core_size
);
2739 mod
->module_core
= ptr
;
2741 ptr
= module_alloc_update_bounds(mod
->init_size
);
2743 * The pointer to this block is stored in the module structure
2744 * which is inside the block. This block doesn't need to be
2745 * scanned as it contains data and code that will be freed
2746 * after the module is initialized.
2748 kmemleak_ignore(ptr
);
2749 if (!ptr
&& mod
->init_size
) {
2750 module_free(mod
, mod
->module_core
);
2753 memset(ptr
, 0, mod
->init_size
);
2754 mod
->module_init
= ptr
;
2756 /* Transfer each section which specifies SHF_ALLOC */
2757 pr_debug("final section addresses:\n");
2758 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
2760 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2762 if (!(shdr
->sh_flags
& SHF_ALLOC
))
2765 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
2766 dest
= mod
->module_init
2767 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
2769 dest
= mod
->module_core
+ shdr
->sh_entsize
;
2771 if (shdr
->sh_type
!= SHT_NOBITS
)
2772 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
2773 /* Update sh_addr to point to copy in image. */
2774 shdr
->sh_addr
= (unsigned long)dest
;
2775 pr_debug("\t0x%lx %s\n",
2776 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
2782 static int check_module_license_and_versions(struct module
*mod
)
2785 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2786 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2787 * using GPL-only symbols it needs.
2789 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2790 add_taint(TAINT_PROPRIETARY_MODULE
);
2792 /* driverloader was caught wrongly pretending to be under GPL */
2793 if (strcmp(mod
->name
, "driverloader") == 0)
2794 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2796 /* lve claims to be GPL but upstream won't provide source */
2797 if (strcmp(mod
->name
, "lve") == 0)
2798 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2800 #ifdef CONFIG_MODVERSIONS
2801 if ((mod
->num_syms
&& !mod
->crcs
)
2802 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2803 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2804 #ifdef CONFIG_UNUSED_SYMBOLS
2805 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2806 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2809 return try_to_force_load(mod
,
2810 "no versions for exported symbols");
2816 static void flush_module_icache(const struct module
*mod
)
2818 mm_segment_t old_fs
;
2820 /* flush the icache in correct context */
2825 * Flush the instruction cache, since we've played with text.
2826 * Do it before processing of module parameters, so the module
2827 * can provide parameter accessor functions of its own.
2829 if (mod
->module_init
)
2830 flush_icache_range((unsigned long)mod
->module_init
,
2831 (unsigned long)mod
->module_init
2833 flush_icache_range((unsigned long)mod
->module_core
,
2834 (unsigned long)mod
->module_core
+ mod
->core_size
);
2839 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
2847 static struct module
*layout_and_allocate(struct load_info
*info
)
2849 /* Module within temporary copy. */
2854 mod
= setup_load_info(info
);
2858 err
= check_modinfo(mod
, info
);
2860 return ERR_PTR(err
);
2862 /* Allow arches to frob section contents and sizes. */
2863 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
2864 info
->secstrings
, mod
);
2868 pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
2869 if (pcpusec
->sh_size
) {
2870 /* We have a special allocation for this section. */
2871 err
= percpu_modalloc(mod
,
2872 pcpusec
->sh_size
, pcpusec
->sh_addralign
);
2875 pcpusec
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2878 /* Determine total sizes, and put offsets in sh_entsize. For now
2879 this is done generically; there doesn't appear to be any
2880 special cases for the architectures. */
2881 layout_sections(mod
, info
);
2882 layout_symtab(mod
, info
);
2884 /* Allocate and move to the final place */
2885 err
= move_module(mod
, info
);
2889 /* Module has been copied to its final place now: return it. */
2890 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2891 kmemleak_load_module(mod
, info
);
2895 percpu_modfree(mod
);
2897 return ERR_PTR(err
);
2900 /* mod is no longer valid after this! */
2901 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
2903 percpu_modfree(mod
);
2904 module_free(mod
, mod
->module_init
);
2905 module_free(mod
, mod
->module_core
);
2908 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
2909 const Elf_Shdr
*sechdrs
,
2915 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
2917 /* Sort exception table now relocations are done. */
2918 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2920 /* Copy relocated percpu area over. */
2921 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
2922 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
2924 /* Setup kallsyms-specific fields. */
2925 add_kallsyms(mod
, info
);
2927 /* Arch-specific module finalizing. */
2928 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
2931 /* Is this module of this name done loading? No locks held. */
2932 static bool finished_loading(const char *name
)
2937 mutex_lock(&module_mutex
);
2938 mod
= find_module(name
);
2939 ret
= !mod
|| mod
->state
!= MODULE_STATE_COMING
;
2940 mutex_unlock(&module_mutex
);
2945 /* Allocate and load the module: note that size of section 0 is always
2946 zero, and we rely on this for optional sections. */
2947 static struct module
*load_module(void __user
*umod
,
2949 const char __user
*uargs
)
2951 struct load_info info
= { NULL
, };
2952 struct module
*mod
, *old
;
2955 pr_debug("load_module: umod=%p, len=%lu, uargs=%p\n",
2958 /* Copy in the blobs from userspace, check they are vaguely sane. */
2959 err
= copy_and_check(&info
, umod
, len
, uargs
);
2961 return ERR_PTR(err
);
2963 /* Figure out module layout, and allocate all the memory. */
2964 mod
= layout_and_allocate(&info
);
2970 #ifdef CONFIG_MODULE_SIG
2971 mod
->sig_ok
= info
.sig_ok
;
2973 add_taint_module(mod
, TAINT_FORCED_MODULE
);
2976 /* Now module is in final location, initialize linked lists, etc. */
2977 err
= module_unload_init(mod
);
2981 /* Now we've got everything in the final locations, we can
2982 * find optional sections. */
2983 find_module_sections(mod
, &info
);
2985 err
= check_module_license_and_versions(mod
);
2989 /* Set up MODINFO_ATTR fields */
2990 setup_modinfo(mod
, &info
);
2992 /* Fix up syms, so that st_value is a pointer to location. */
2993 err
= simplify_symbols(mod
, &info
);
2997 err
= apply_relocations(mod
, &info
);
3001 err
= post_relocation(mod
, &info
);
3005 flush_module_icache(mod
);
3007 /* Now copy in args */
3008 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3009 if (IS_ERR(mod
->args
)) {
3010 err
= PTR_ERR(mod
->args
);
3011 goto free_arch_cleanup
;
3014 /* Mark state as coming so strong_try_module_get() ignores us. */
3015 mod
->state
= MODULE_STATE_COMING
;
3017 /* Now sew it into the lists so we can get lockdep and oops
3018 * info during argument parsing. No one should access us, since
3019 * strong_try_module_get() will fail.
3020 * lockdep/oops can run asynchronous, so use the RCU list insertion
3021 * function to insert in a way safe to concurrent readers.
3022 * The mutex protects against concurrent writers.
3025 mutex_lock(&module_mutex
);
3026 if ((old
= find_module(mod
->name
)) != NULL
) {
3027 if (old
->state
== MODULE_STATE_COMING
) {
3028 /* Wait in case it fails to load. */
3029 mutex_unlock(&module_mutex
);
3030 err
= wait_event_interruptible(module_wq
,
3031 finished_loading(mod
->name
));
3033 goto free_arch_cleanup
;
3040 /* This has to be done once we're sure module name is unique. */
3041 dynamic_debug_setup(info
.debug
, info
.num_debug
);
3043 /* Find duplicate symbols */
3044 err
= verify_export_symbols(mod
);
3048 module_bug_finalize(info
.hdr
, info
.sechdrs
, mod
);
3049 list_add_rcu(&mod
->list
, &modules
);
3050 mutex_unlock(&module_mutex
);
3052 /* Module is ready to execute: parsing args may do that. */
3053 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3054 -32768, 32767, &ddebug_dyndbg_module_param_cb
);
3058 /* Link in to syfs. */
3059 err
= mod_sysfs_setup(mod
, &info
, mod
->kp
, mod
->num_kp
);
3063 /* Get rid of temporary copy. */
3067 trace_module_load(mod
);
3071 mutex_lock(&module_mutex
);
3072 /* Unlink carefully: kallsyms could be walking list. */
3073 list_del_rcu(&mod
->list
);
3074 module_bug_cleanup(mod
);
3075 wake_up_all(&module_wq
);
3077 dynamic_debug_remove(info
.debug
);
3079 mutex_unlock(&module_mutex
);
3080 synchronize_sched();
3083 module_arch_cleanup(mod
);
3087 module_unload_free(mod
);
3089 module_deallocate(mod
, &info
);
3092 return ERR_PTR(err
);
3095 /* Call module constructors. */
3096 static void do_mod_ctors(struct module
*mod
)
3098 #ifdef CONFIG_CONSTRUCTORS
3101 for (i
= 0; i
< mod
->num_ctors
; i
++)
3106 /* This is where the real work happens */
3107 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3108 unsigned long, len
, const char __user
*, uargs
)
3113 /* Must have permission */
3114 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3117 /* Do all the hard work */
3118 mod
= load_module(umod
, len
, uargs
);
3120 return PTR_ERR(mod
);
3122 blocking_notifier_call_chain(&module_notify_list
,
3123 MODULE_STATE_COMING
, mod
);
3125 /* Set RO and NX regions for core */
3126 set_section_ro_nx(mod
->module_core
,
3127 mod
->core_text_size
,
3131 /* Set RO and NX regions for init */
3132 set_section_ro_nx(mod
->module_init
,
3133 mod
->init_text_size
,
3138 /* Start the module */
3139 if (mod
->init
!= NULL
)
3140 ret
= do_one_initcall(mod
->init
);
3142 /* Init routine failed: abort. Try to protect us from
3143 buggy refcounters. */
3144 mod
->state
= MODULE_STATE_GOING
;
3145 synchronize_sched();
3147 blocking_notifier_call_chain(&module_notify_list
,
3148 MODULE_STATE_GOING
, mod
);
3150 wake_up_all(&module_wq
);
3155 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3156 "%s: loading module anyway...\n",
3157 __func__
, mod
->name
, ret
,
3162 /* Now it's a first class citizen! */
3163 mod
->state
= MODULE_STATE_LIVE
;
3164 blocking_notifier_call_chain(&module_notify_list
,
3165 MODULE_STATE_LIVE
, mod
);
3167 /* We need to finish all async code before the module init sequence is done */
3168 async_synchronize_full();
3170 mutex_lock(&module_mutex
);
3171 /* Drop initial reference. */
3173 trim_init_extable(mod
);
3174 #ifdef CONFIG_KALLSYMS
3175 mod
->num_symtab
= mod
->core_num_syms
;
3176 mod
->symtab
= mod
->core_symtab
;
3177 mod
->strtab
= mod
->core_strtab
;
3179 unset_module_init_ro_nx(mod
);
3180 module_free(mod
, mod
->module_init
);
3181 mod
->module_init
= NULL
;
3183 mod
->init_ro_size
= 0;
3184 mod
->init_text_size
= 0;
3185 mutex_unlock(&module_mutex
);
3186 wake_up_all(&module_wq
);
3191 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3193 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3196 #ifdef CONFIG_KALLSYMS
3198 * This ignores the intensely annoying "mapping symbols" found
3199 * in ARM ELF files: $a, $t and $d.
3201 static inline int is_arm_mapping_symbol(const char *str
)
3203 return str
[0] == '$' && strchr("atd", str
[1])
3204 && (str
[2] == '\0' || str
[2] == '.');
3207 static const char *get_ksymbol(struct module
*mod
,
3209 unsigned long *size
,
3210 unsigned long *offset
)
3212 unsigned int i
, best
= 0;
3213 unsigned long nextval
;
3215 /* At worse, next value is at end of module */
3216 if (within_module_init(addr
, mod
))
3217 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
3219 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
3221 /* Scan for closest preceding symbol, and next symbol. (ELF
3222 starts real symbols at 1). */
3223 for (i
= 1; i
< mod
->num_symtab
; i
++) {
3224 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3227 /* We ignore unnamed symbols: they're uninformative
3228 * and inserted at a whim. */
3229 if (mod
->symtab
[i
].st_value
<= addr
3230 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
3231 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3232 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3234 if (mod
->symtab
[i
].st_value
> addr
3235 && mod
->symtab
[i
].st_value
< nextval
3236 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3237 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3238 nextval
= mod
->symtab
[i
].st_value
;
3245 *size
= nextval
- mod
->symtab
[best
].st_value
;
3247 *offset
= addr
- mod
->symtab
[best
].st_value
;
3248 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
3251 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3252 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3253 const char *module_address_lookup(unsigned long addr
,
3254 unsigned long *size
,
3255 unsigned long *offset
,
3260 const char *ret
= NULL
;
3263 list_for_each_entry_rcu(mod
, &modules
, list
) {
3264 if (within_module_init(addr
, mod
) ||
3265 within_module_core(addr
, mod
)) {
3267 *modname
= mod
->name
;
3268 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3272 /* Make a copy in here where it's safe */
3274 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3281 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3286 list_for_each_entry_rcu(mod
, &modules
, list
) {
3287 if (within_module_init(addr
, mod
) ||
3288 within_module_core(addr
, mod
)) {
3291 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3294 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3304 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3305 unsigned long *offset
, char *modname
, char *name
)
3310 list_for_each_entry_rcu(mod
, &modules
, list
) {
3311 if (within_module_init(addr
, mod
) ||
3312 within_module_core(addr
, mod
)) {
3315 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3319 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3321 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3331 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3332 char *name
, char *module_name
, int *exported
)
3337 list_for_each_entry_rcu(mod
, &modules
, list
) {
3338 if (symnum
< mod
->num_symtab
) {
3339 *value
= mod
->symtab
[symnum
].st_value
;
3340 *type
= mod
->symtab
[symnum
].st_info
;
3341 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
3343 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3344 *exported
= is_exported(name
, *value
, mod
);
3348 symnum
-= mod
->num_symtab
;
3354 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3358 for (i
= 0; i
< mod
->num_symtab
; i
++)
3359 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
3360 mod
->symtab
[i
].st_info
!= 'U')
3361 return mod
->symtab
[i
].st_value
;
3365 /* Look for this name: can be of form module:name. */
3366 unsigned long module_kallsyms_lookup_name(const char *name
)
3370 unsigned long ret
= 0;
3372 /* Don't lock: we're in enough trouble already. */
3374 if ((colon
= strchr(name
, ':')) != NULL
) {
3376 if ((mod
= find_module(name
)) != NULL
)
3377 ret
= mod_find_symname(mod
, colon
+1);
3380 list_for_each_entry_rcu(mod
, &modules
, list
)
3381 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3388 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3389 struct module
*, unsigned long),
3396 list_for_each_entry(mod
, &modules
, list
) {
3397 for (i
= 0; i
< mod
->num_symtab
; i
++) {
3398 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
3399 mod
, mod
->symtab
[i
].st_value
);
3406 #endif /* CONFIG_KALLSYMS */
3408 static char *module_flags(struct module
*mod
, char *buf
)
3413 mod
->state
== MODULE_STATE_GOING
||
3414 mod
->state
== MODULE_STATE_COMING
) {
3416 bx
+= module_flags_taint(mod
, buf
+ bx
);
3417 /* Show a - for module-is-being-unloaded */
3418 if (mod
->state
== MODULE_STATE_GOING
)
3420 /* Show a + for module-is-being-loaded */
3421 if (mod
->state
== MODULE_STATE_COMING
)
3430 #ifdef CONFIG_PROC_FS
3431 /* Called by the /proc file system to return a list of modules. */
3432 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3434 mutex_lock(&module_mutex
);
3435 return seq_list_start(&modules
, *pos
);
3438 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3440 return seq_list_next(p
, &modules
, pos
);
3443 static void m_stop(struct seq_file
*m
, void *p
)
3445 mutex_unlock(&module_mutex
);
3448 static int m_show(struct seq_file
*m
, void *p
)
3450 struct module
*mod
= list_entry(p
, struct module
, list
);
3453 seq_printf(m
, "%s %u",
3454 mod
->name
, mod
->init_size
+ mod
->core_size
);
3455 print_unload_info(m
, mod
);
3457 /* Informative for users. */
3458 seq_printf(m
, " %s",
3459 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3460 mod
->state
== MODULE_STATE_COMING
? "Loading":
3462 /* Used by oprofile and other similar tools. */
3463 seq_printf(m
, " 0x%pK", mod
->module_core
);
3467 seq_printf(m
, " %s", module_flags(mod
, buf
));
3469 seq_printf(m
, "\n");
3473 /* Format: modulename size refcount deps address
3475 Where refcount is a number or -, and deps is a comma-separated list
3478 static const struct seq_operations modules_op
= {
3485 static int modules_open(struct inode
*inode
, struct file
*file
)
3487 return seq_open(file
, &modules_op
);
3490 static const struct file_operations proc_modules_operations
= {
3491 .open
= modules_open
,
3493 .llseek
= seq_lseek
,
3494 .release
= seq_release
,
3497 static int __init
proc_modules_init(void)
3499 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3502 module_init(proc_modules_init
);
3505 /* Given an address, look for it in the module exception tables. */
3506 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3508 const struct exception_table_entry
*e
= NULL
;
3512 list_for_each_entry_rcu(mod
, &modules
, list
) {
3513 if (mod
->num_exentries
== 0)
3516 e
= search_extable(mod
->extable
,
3517 mod
->extable
+ mod
->num_exentries
- 1,
3524 /* Now, if we found one, we are running inside it now, hence
3525 we cannot unload the module, hence no refcnt needed. */
3530 * is_module_address - is this address inside a module?
3531 * @addr: the address to check.
3533 * See is_module_text_address() if you simply want to see if the address
3534 * is code (not data).
3536 bool is_module_address(unsigned long addr
)
3541 ret
= __module_address(addr
) != NULL
;
3548 * __module_address - get the module which contains an address.
3549 * @addr: the address.
3551 * Must be called with preempt disabled or module mutex held so that
3552 * module doesn't get freed during this.
3554 struct module
*__module_address(unsigned long addr
)
3558 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3561 list_for_each_entry_rcu(mod
, &modules
, list
)
3562 if (within_module_core(addr
, mod
)
3563 || within_module_init(addr
, mod
))
3567 EXPORT_SYMBOL_GPL(__module_address
);
3570 * is_module_text_address - is this address inside module code?
3571 * @addr: the address to check.
3573 * See is_module_address() if you simply want to see if the address is
3574 * anywhere in a module. See kernel_text_address() for testing if an
3575 * address corresponds to kernel or module code.
3577 bool is_module_text_address(unsigned long addr
)
3582 ret
= __module_text_address(addr
) != NULL
;
3589 * __module_text_address - get the module whose code contains an address.
3590 * @addr: the address.
3592 * Must be called with preempt disabled or module mutex held so that
3593 * module doesn't get freed during this.
3595 struct module
*__module_text_address(unsigned long addr
)
3597 struct module
*mod
= __module_address(addr
);
3599 /* Make sure it's within the text section. */
3600 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3601 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3606 EXPORT_SYMBOL_GPL(__module_text_address
);
3608 /* Don't grab lock, we're oopsing. */
3609 void print_modules(void)
3614 printk(KERN_DEFAULT
"Modules linked in:");
3615 /* Most callers should already have preempt disabled, but make sure */
3617 list_for_each_entry_rcu(mod
, &modules
, list
)
3618 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3620 if (last_unloaded_module
[0])
3621 printk(" [last unloaded: %s]", last_unloaded_module
);
3625 #ifdef CONFIG_MODVERSIONS
3626 /* Generate the signature for all relevant module structures here.
3627 * If these change, we don't want to try to parse the module. */
3628 void module_layout(struct module
*mod
,
3629 struct modversion_info
*ver
,
3630 struct kernel_param
*kp
,
3631 struct kernel_symbol
*ks
,
3632 struct tracepoint
* const *tp
)
3635 EXPORT_SYMBOL(module_layout
);