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>
62 #define CREATE_TRACE_POINTS
63 #include <trace/events/module.h>
65 #ifndef ARCH_SHF_SMALL
66 #define ARCH_SHF_SMALL 0
70 * Modules' sections will be aligned on page boundaries
71 * to ensure complete separation of code and data, but
72 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
74 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
75 # define debug_align(X) ALIGN(X, PAGE_SIZE)
77 # define debug_align(X) (X)
81 * Given BASE and SIZE this macro calculates the number of pages the
82 * memory regions occupies
84 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
85 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
86 PFN_DOWN((unsigned long)BASE) + 1) \
89 /* If this is set, the section belongs in the init part of the module */
90 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
94 * 1) List of modules (also safely readable with preempt_disable),
95 * 2) module_use links,
96 * 3) module_addr_min/module_addr_max.
97 * (delete uses stop_machine/add uses RCU list operations). */
98 DEFINE_MUTEX(module_mutex
);
99 EXPORT_SYMBOL_GPL(module_mutex
);
100 static LIST_HEAD(modules
);
101 #ifdef CONFIG_KGDB_KDB
102 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
103 #endif /* CONFIG_KGDB_KDB */
106 /* Block module loading/unloading? */
107 int modules_disabled
= 0;
108 core_param(nomodule
, modules_disabled
, bint
, 0);
110 /* Waiting for a module to finish initializing? */
111 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
113 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
115 /* Bounds of module allocation, for speeding __module_address.
116 * Protected by module_mutex. */
117 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
119 int register_module_notifier(struct notifier_block
* nb
)
121 return blocking_notifier_chain_register(&module_notify_list
, nb
);
123 EXPORT_SYMBOL(register_module_notifier
);
125 int unregister_module_notifier(struct notifier_block
* nb
)
127 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
129 EXPORT_SYMBOL(unregister_module_notifier
);
135 char *secstrings
, *strtab
;
136 unsigned long symoffs
, stroffs
;
137 struct _ddebug
*debug
;
138 unsigned int num_debug
;
140 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
144 /* We require a truly strong try_module_get(): 0 means failure due to
145 ongoing or failed initialization etc. */
146 static inline int strong_try_module_get(struct module
*mod
)
148 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
150 if (try_module_get(mod
))
156 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
159 mod
->taints
|= (1U << flag
);
163 * A thread that wants to hold a reference to a module only while it
164 * is running can call this to safely exit. nfsd and lockd use this.
166 void __module_put_and_exit(struct module
*mod
, long code
)
171 EXPORT_SYMBOL(__module_put_and_exit
);
173 /* Find a module section: 0 means not found. */
174 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
178 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
179 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
180 /* Alloc bit cleared means "ignore it." */
181 if ((shdr
->sh_flags
& SHF_ALLOC
)
182 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
188 /* Find a module section, or NULL. */
189 static void *section_addr(const struct load_info
*info
, const char *name
)
191 /* Section 0 has sh_addr 0. */
192 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
195 /* Find a module section, or NULL. Fill in number of "objects" in section. */
196 static void *section_objs(const struct load_info
*info
,
201 unsigned int sec
= find_sec(info
, name
);
203 /* Section 0 has sh_addr 0 and sh_size 0. */
204 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
205 return (void *)info
->sechdrs
[sec
].sh_addr
;
208 /* Provided by the linker */
209 extern const struct kernel_symbol __start___ksymtab
[];
210 extern const struct kernel_symbol __stop___ksymtab
[];
211 extern const struct kernel_symbol __start___ksymtab_gpl
[];
212 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
213 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
214 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
215 extern const unsigned long __start___kcrctab
[];
216 extern const unsigned long __start___kcrctab_gpl
[];
217 extern const unsigned long __start___kcrctab_gpl_future
[];
218 #ifdef CONFIG_UNUSED_SYMBOLS
219 extern const struct kernel_symbol __start___ksymtab_unused
[];
220 extern const struct kernel_symbol __stop___ksymtab_unused
[];
221 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
222 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
223 extern const unsigned long __start___kcrctab_unused
[];
224 extern const unsigned long __start___kcrctab_unused_gpl
[];
227 #ifndef CONFIG_MODVERSIONS
228 #define symversion(base, idx) NULL
230 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
233 static bool each_symbol_in_section(const struct symsearch
*arr
,
234 unsigned int arrsize
,
235 struct module
*owner
,
236 bool (*fn
)(const struct symsearch
*syms
,
237 struct module
*owner
,
243 for (j
= 0; j
< arrsize
; j
++) {
244 if (fn(&arr
[j
], owner
, data
))
251 /* Returns true as soon as fn returns true, otherwise false. */
252 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
253 struct module
*owner
,
258 static const struct symsearch arr
[] = {
259 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
260 NOT_GPL_ONLY
, false },
261 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
262 __start___kcrctab_gpl
,
264 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
265 __start___kcrctab_gpl_future
,
266 WILL_BE_GPL_ONLY
, false },
267 #ifdef CONFIG_UNUSED_SYMBOLS
268 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
269 __start___kcrctab_unused
,
270 NOT_GPL_ONLY
, true },
271 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
272 __start___kcrctab_unused_gpl
,
277 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
280 list_for_each_entry_rcu(mod
, &modules
, list
) {
281 struct symsearch arr
[] = {
282 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
283 NOT_GPL_ONLY
, false },
284 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
287 { mod
->gpl_future_syms
,
288 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
289 mod
->gpl_future_crcs
,
290 WILL_BE_GPL_ONLY
, false },
291 #ifdef CONFIG_UNUSED_SYMBOLS
293 mod
->unused_syms
+ mod
->num_unused_syms
,
295 NOT_GPL_ONLY
, true },
296 { mod
->unused_gpl_syms
,
297 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
298 mod
->unused_gpl_crcs
,
303 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
308 EXPORT_SYMBOL_GPL(each_symbol_section
);
310 struct find_symbol_arg
{
317 struct module
*owner
;
318 const unsigned long *crc
;
319 const struct kernel_symbol
*sym
;
322 static bool check_symbol(const struct symsearch
*syms
,
323 struct module
*owner
,
324 unsigned int symnum
, void *data
)
326 struct find_symbol_arg
*fsa
= data
;
329 if (syms
->licence
== GPL_ONLY
)
331 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
332 printk(KERN_WARNING
"Symbol %s is being used "
333 "by a non-GPL module, which will not "
334 "be allowed in the future\n", fsa
->name
);
335 printk(KERN_WARNING
"Please see the file "
336 "Documentation/feature-removal-schedule.txt "
337 "in the kernel source tree for more details.\n");
341 #ifdef CONFIG_UNUSED_SYMBOLS
342 if (syms
->unused
&& fsa
->warn
) {
343 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
344 "however this module is using it.\n", fsa
->name
);
346 "This symbol will go away in the future.\n");
348 "Please evalute if this is the right api to use and if "
349 "it really is, submit a report the linux kernel "
350 "mailinglist together with submitting your code for "
356 fsa
->crc
= symversion(syms
->crcs
, symnum
);
357 fsa
->sym
= &syms
->start
[symnum
];
361 static int cmp_name(const void *va
, const void *vb
)
364 const struct kernel_symbol
*b
;
366 return strcmp(a
, b
->name
);
369 static bool find_symbol_in_section(const struct symsearch
*syms
,
370 struct module
*owner
,
373 struct find_symbol_arg
*fsa
= data
;
374 struct kernel_symbol
*sym
;
376 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
377 sizeof(struct kernel_symbol
), cmp_name
);
379 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
385 /* Find a symbol and return it, along with, (optional) crc and
386 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
387 const struct kernel_symbol
*find_symbol(const char *name
,
388 struct module
**owner
,
389 const unsigned long **crc
,
393 struct find_symbol_arg fsa
;
399 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
407 pr_debug("Failed to find symbol %s\n", name
);
410 EXPORT_SYMBOL_GPL(find_symbol
);
412 /* Search for module by name: must hold module_mutex. */
413 struct module
*find_module(const char *name
)
417 list_for_each_entry(mod
, &modules
, list
) {
418 if (strcmp(mod
->name
, name
) == 0)
423 EXPORT_SYMBOL_GPL(find_module
);
427 static inline void __percpu
*mod_percpu(struct module
*mod
)
432 static int percpu_modalloc(struct module
*mod
,
433 unsigned long size
, unsigned long align
)
435 if (align
> PAGE_SIZE
) {
436 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
437 mod
->name
, align
, PAGE_SIZE
);
441 mod
->percpu
= __alloc_reserved_percpu(size
, align
);
444 "%s: Could not allocate %lu bytes percpu data\n",
448 mod
->percpu_size
= size
;
452 static void percpu_modfree(struct module
*mod
)
454 free_percpu(mod
->percpu
);
457 static unsigned int find_pcpusec(struct load_info
*info
)
459 return find_sec(info
, ".data..percpu");
462 static void percpu_modcopy(struct module
*mod
,
463 const void *from
, unsigned long size
)
467 for_each_possible_cpu(cpu
)
468 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
472 * is_module_percpu_address - test whether address is from module static percpu
473 * @addr: address to test
475 * Test whether @addr belongs to module static percpu area.
478 * %true if @addr is from module static percpu area
480 bool is_module_percpu_address(unsigned long addr
)
487 list_for_each_entry_rcu(mod
, &modules
, list
) {
488 if (!mod
->percpu_size
)
490 for_each_possible_cpu(cpu
) {
491 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
493 if ((void *)addr
>= start
&&
494 (void *)addr
< start
+ mod
->percpu_size
) {
505 #else /* ... !CONFIG_SMP */
507 static inline void __percpu
*mod_percpu(struct module
*mod
)
511 static inline int percpu_modalloc(struct module
*mod
,
512 unsigned long size
, unsigned long align
)
516 static inline void percpu_modfree(struct module
*mod
)
519 static unsigned int find_pcpusec(struct load_info
*info
)
523 static inline void percpu_modcopy(struct module
*mod
,
524 const void *from
, unsigned long size
)
526 /* pcpusec should be 0, and size of that section should be 0. */
529 bool is_module_percpu_address(unsigned long addr
)
534 #endif /* CONFIG_SMP */
536 #define MODINFO_ATTR(field) \
537 static void setup_modinfo_##field(struct module *mod, const char *s) \
539 mod->field = kstrdup(s, GFP_KERNEL); \
541 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
542 struct module_kobject *mk, char *buffer) \
544 return sprintf(buffer, "%s\n", mk->mod->field); \
546 static int modinfo_##field##_exists(struct module *mod) \
548 return mod->field != NULL; \
550 static void free_modinfo_##field(struct module *mod) \
555 static struct module_attribute modinfo_##field = { \
556 .attr = { .name = __stringify(field), .mode = 0444 }, \
557 .show = show_modinfo_##field, \
558 .setup = setup_modinfo_##field, \
559 .test = modinfo_##field##_exists, \
560 .free = free_modinfo_##field, \
563 MODINFO_ATTR(version
);
564 MODINFO_ATTR(srcversion
);
566 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
568 #ifdef CONFIG_MODULE_UNLOAD
570 EXPORT_TRACEPOINT_SYMBOL(module_get
);
572 /* Init the unload section of the module. */
573 static int module_unload_init(struct module
*mod
)
575 mod
->refptr
= alloc_percpu(struct module_ref
);
579 INIT_LIST_HEAD(&mod
->source_list
);
580 INIT_LIST_HEAD(&mod
->target_list
);
582 /* Hold reference count during initialization. */
583 __this_cpu_write(mod
->refptr
->incs
, 1);
584 /* Backwards compatibility macros put refcount during init. */
585 mod
->waiter
= current
;
590 /* Does a already use b? */
591 static int already_uses(struct module
*a
, struct module
*b
)
593 struct module_use
*use
;
595 list_for_each_entry(use
, &b
->source_list
, source_list
) {
596 if (use
->source
== a
) {
597 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
601 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
607 * - we add 'a' as a "source", 'b' as a "target" of module use
608 * - the module_use is added to the list of 'b' sources (so
609 * 'b' can walk the list to see who sourced them), and of 'a'
610 * targets (so 'a' can see what modules it targets).
612 static int add_module_usage(struct module
*a
, struct module
*b
)
614 struct module_use
*use
;
616 pr_debug("Allocating new usage for %s.\n", a
->name
);
617 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
619 printk(KERN_WARNING
"%s: out of memory loading\n", a
->name
);
625 list_add(&use
->source_list
, &b
->source_list
);
626 list_add(&use
->target_list
, &a
->target_list
);
630 /* Module a uses b: caller needs module_mutex() */
631 int ref_module(struct module
*a
, struct module
*b
)
635 if (b
== NULL
|| already_uses(a
, b
))
638 /* If module isn't available, we fail. */
639 err
= strong_try_module_get(b
);
643 err
= add_module_usage(a
, b
);
650 EXPORT_SYMBOL_GPL(ref_module
);
652 /* Clear the unload stuff of the module. */
653 static void module_unload_free(struct module
*mod
)
655 struct module_use
*use
, *tmp
;
657 mutex_lock(&module_mutex
);
658 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
659 struct module
*i
= use
->target
;
660 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
662 list_del(&use
->source_list
);
663 list_del(&use
->target_list
);
666 mutex_unlock(&module_mutex
);
668 free_percpu(mod
->refptr
);
671 #ifdef CONFIG_MODULE_FORCE_UNLOAD
672 static inline int try_force_unload(unsigned int flags
)
674 int ret
= (flags
& O_TRUNC
);
676 add_taint(TAINT_FORCED_RMMOD
);
680 static inline int try_force_unload(unsigned int flags
)
684 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
693 /* Whole machine is stopped with interrupts off when this runs. */
694 static int __try_stop_module(void *_sref
)
696 struct stopref
*sref
= _sref
;
698 /* If it's not unused, quit unless we're forcing. */
699 if (module_refcount(sref
->mod
) != 0) {
700 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
704 /* Mark it as dying. */
705 sref
->mod
->state
= MODULE_STATE_GOING
;
709 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
711 if (flags
& O_NONBLOCK
) {
712 struct stopref sref
= { mod
, flags
, forced
};
714 return stop_machine(__try_stop_module
, &sref
, NULL
);
716 /* We don't need to stop the machine for this. */
717 mod
->state
= MODULE_STATE_GOING
;
723 unsigned long module_refcount(struct module
*mod
)
725 unsigned long incs
= 0, decs
= 0;
728 for_each_possible_cpu(cpu
)
729 decs
+= per_cpu_ptr(mod
->refptr
, cpu
)->decs
;
731 * ensure the incs are added up after the decs.
732 * module_put ensures incs are visible before decs with smp_wmb.
734 * This 2-count scheme avoids the situation where the refcount
735 * for CPU0 is read, then CPU0 increments the module refcount,
736 * then CPU1 drops that refcount, then the refcount for CPU1 is
737 * read. We would record a decrement but not its corresponding
738 * increment so we would see a low count (disaster).
740 * Rare situation? But module_refcount can be preempted, and we
741 * might be tallying up 4096+ CPUs. So it is not impossible.
744 for_each_possible_cpu(cpu
)
745 incs
+= per_cpu_ptr(mod
->refptr
, cpu
)->incs
;
748 EXPORT_SYMBOL(module_refcount
);
750 /* This exists whether we can unload or not */
751 static void free_module(struct module
*mod
);
753 static void wait_for_zero_refcount(struct module
*mod
)
755 /* Since we might sleep for some time, release the mutex first */
756 mutex_unlock(&module_mutex
);
758 pr_debug("Looking at refcount...\n");
759 set_current_state(TASK_UNINTERRUPTIBLE
);
760 if (module_refcount(mod
) == 0)
764 current
->state
= TASK_RUNNING
;
765 mutex_lock(&module_mutex
);
768 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
772 char name
[MODULE_NAME_LEN
];
775 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
778 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
780 name
[MODULE_NAME_LEN
-1] = '\0';
782 if (mutex_lock_interruptible(&module_mutex
) != 0)
785 mod
= find_module(name
);
791 if (!list_empty(&mod
->source_list
)) {
792 /* Other modules depend on us: get rid of them first. */
797 /* Doing init or already dying? */
798 if (mod
->state
!= MODULE_STATE_LIVE
) {
799 /* FIXME: if (force), slam module count and wake up
801 pr_debug("%s already dying\n", mod
->name
);
806 /* If it has an init func, it must have an exit func to unload */
807 if (mod
->init
&& !mod
->exit
) {
808 forced
= try_force_unload(flags
);
810 /* This module can't be removed */
816 /* Set this up before setting mod->state */
817 mod
->waiter
= current
;
819 /* Stop the machine so refcounts can't move and disable module. */
820 ret
= try_stop_module(mod
, flags
, &forced
);
824 /* Never wait if forced. */
825 if (!forced
&& module_refcount(mod
) != 0)
826 wait_for_zero_refcount(mod
);
828 mutex_unlock(&module_mutex
);
829 /* Final destruction now no one is using it. */
830 if (mod
->exit
!= NULL
)
832 blocking_notifier_call_chain(&module_notify_list
,
833 MODULE_STATE_GOING
, mod
);
834 async_synchronize_full();
836 /* Store the name of the last unloaded module for diagnostic purposes */
837 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
842 mutex_unlock(&module_mutex
);
846 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
848 struct module_use
*use
;
849 int printed_something
= 0;
851 seq_printf(m
, " %lu ", module_refcount(mod
));
853 /* Always include a trailing , so userspace can differentiate
854 between this and the old multi-field proc format. */
855 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
856 printed_something
= 1;
857 seq_printf(m
, "%s,", use
->source
->name
);
860 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
861 printed_something
= 1;
862 seq_printf(m
, "[permanent],");
865 if (!printed_something
)
869 void __symbol_put(const char *symbol
)
871 struct module
*owner
;
874 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
879 EXPORT_SYMBOL(__symbol_put
);
881 /* Note this assumes addr is a function, which it currently always is. */
882 void symbol_put_addr(void *addr
)
884 struct module
*modaddr
;
885 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
887 if (core_kernel_text(a
))
890 /* module_text_address is safe here: we're supposed to have reference
891 * to module from symbol_get, so it can't go away. */
892 modaddr
= __module_text_address(a
);
896 EXPORT_SYMBOL_GPL(symbol_put_addr
);
898 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
899 struct module_kobject
*mk
, char *buffer
)
901 return sprintf(buffer
, "%lu\n", module_refcount(mk
->mod
));
904 static struct module_attribute modinfo_refcnt
=
905 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
907 void __module_get(struct module
*module
)
911 __this_cpu_inc(module
->refptr
->incs
);
912 trace_module_get(module
, _RET_IP_
);
916 EXPORT_SYMBOL(__module_get
);
918 bool try_module_get(struct module
*module
)
925 if (likely(module_is_live(module
))) {
926 __this_cpu_inc(module
->refptr
->incs
);
927 trace_module_get(module
, _RET_IP_
);
935 EXPORT_SYMBOL(try_module_get
);
937 void module_put(struct module
*module
)
941 smp_wmb(); /* see comment in module_refcount */
942 __this_cpu_inc(module
->refptr
->decs
);
944 trace_module_put(module
, _RET_IP_
);
945 /* Maybe they're waiting for us to drop reference? */
946 if (unlikely(!module_is_live(module
)))
947 wake_up_process(module
->waiter
);
951 EXPORT_SYMBOL(module_put
);
953 #else /* !CONFIG_MODULE_UNLOAD */
954 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
956 /* We don't know the usage count, or what modules are using. */
957 seq_printf(m
, " - -");
960 static inline void module_unload_free(struct module
*mod
)
964 int ref_module(struct module
*a
, struct module
*b
)
966 return strong_try_module_get(b
);
968 EXPORT_SYMBOL_GPL(ref_module
);
970 static inline int module_unload_init(struct module
*mod
)
974 #endif /* CONFIG_MODULE_UNLOAD */
976 static size_t module_flags_taint(struct module
*mod
, char *buf
)
980 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
982 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
984 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
986 if (mod
->taints
& (1 << TAINT_CRAP
))
989 * TAINT_FORCED_RMMOD: could be added.
990 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
996 static ssize_t
show_initstate(struct module_attribute
*mattr
,
997 struct module_kobject
*mk
, char *buffer
)
999 const char *state
= "unknown";
1001 switch (mk
->mod
->state
) {
1002 case MODULE_STATE_LIVE
:
1005 case MODULE_STATE_COMING
:
1008 case MODULE_STATE_GOING
:
1012 return sprintf(buffer
, "%s\n", state
);
1015 static struct module_attribute modinfo_initstate
=
1016 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1018 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1019 struct module_kobject
*mk
,
1020 const char *buffer
, size_t count
)
1022 enum kobject_action action
;
1024 if (kobject_action_type(buffer
, count
, &action
) == 0)
1025 kobject_uevent(&mk
->kobj
, action
);
1029 struct module_attribute module_uevent
=
1030 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1032 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1033 struct module_kobject
*mk
, char *buffer
)
1035 return sprintf(buffer
, "%u\n", mk
->mod
->core_size
);
1038 static struct module_attribute modinfo_coresize
=
1039 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1041 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1042 struct module_kobject
*mk
, char *buffer
)
1044 return sprintf(buffer
, "%u\n", mk
->mod
->init_size
);
1047 static struct module_attribute modinfo_initsize
=
1048 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1050 static ssize_t
show_taint(struct module_attribute
*mattr
,
1051 struct module_kobject
*mk
, char *buffer
)
1055 l
= module_flags_taint(mk
->mod
, buffer
);
1060 static struct module_attribute modinfo_taint
=
1061 __ATTR(taint
, 0444, show_taint
, NULL
);
1063 static struct module_attribute
*modinfo_attrs
[] = {
1066 &modinfo_srcversion
,
1071 #ifdef CONFIG_MODULE_UNLOAD
1077 static const char vermagic
[] = VERMAGIC_STRING
;
1079 static int try_to_force_load(struct module
*mod
, const char *reason
)
1081 #ifdef CONFIG_MODULE_FORCE_LOAD
1082 if (!test_taint(TAINT_FORCED_MODULE
))
1083 printk(KERN_WARNING
"%s: %s: kernel tainted.\n",
1085 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1092 #ifdef CONFIG_MODVERSIONS
1093 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1094 static unsigned long maybe_relocated(unsigned long crc
,
1095 const struct module
*crc_owner
)
1097 #ifdef ARCH_RELOCATES_KCRCTAB
1098 if (crc_owner
== NULL
)
1099 return crc
- (unsigned long)reloc_start
;
1104 static int check_version(Elf_Shdr
*sechdrs
,
1105 unsigned int versindex
,
1106 const char *symname
,
1108 const unsigned long *crc
,
1109 const struct module
*crc_owner
)
1111 unsigned int i
, num_versions
;
1112 struct modversion_info
*versions
;
1114 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1118 /* No versions at all? modprobe --force does this. */
1120 return try_to_force_load(mod
, symname
) == 0;
1122 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1123 num_versions
= sechdrs
[versindex
].sh_size
1124 / sizeof(struct modversion_info
);
1126 for (i
= 0; i
< num_versions
; i
++) {
1127 if (strcmp(versions
[i
].name
, symname
) != 0)
1130 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1132 pr_debug("Found checksum %lX vs module %lX\n",
1133 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1137 printk(KERN_WARNING
"%s: no symbol version for %s\n",
1138 mod
->name
, symname
);
1142 printk("%s: disagrees about version of symbol %s\n",
1143 mod
->name
, symname
);
1147 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1148 unsigned int versindex
,
1151 const unsigned long *crc
;
1153 /* Since this should be found in kernel (which can't be removed),
1154 * no locking is necessary. */
1155 if (!find_symbol(MODULE_SYMBOL_PREFIX
"module_layout", NULL
,
1158 return check_version(sechdrs
, versindex
, "module_layout", mod
, crc
,
1162 /* First part is kernel version, which we ignore if module has crcs. */
1163 static inline int same_magic(const char *amagic
, const char *bmagic
,
1167 amagic
+= strcspn(amagic
, " ");
1168 bmagic
+= strcspn(bmagic
, " ");
1170 return strcmp(amagic
, bmagic
) == 0;
1173 static inline int check_version(Elf_Shdr
*sechdrs
,
1174 unsigned int versindex
,
1175 const char *symname
,
1177 const unsigned long *crc
,
1178 const struct module
*crc_owner
)
1183 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1184 unsigned int versindex
,
1190 static inline int same_magic(const char *amagic
, const char *bmagic
,
1193 return strcmp(amagic
, bmagic
) == 0;
1195 #endif /* CONFIG_MODVERSIONS */
1197 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1198 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1199 const struct load_info
*info
,
1203 struct module
*owner
;
1204 const struct kernel_symbol
*sym
;
1205 const unsigned long *crc
;
1208 mutex_lock(&module_mutex
);
1209 sym
= find_symbol(name
, &owner
, &crc
,
1210 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1214 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1216 sym
= ERR_PTR(-EINVAL
);
1220 err
= ref_module(mod
, owner
);
1227 /* We must make copy under the lock if we failed to get ref. */
1228 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1230 mutex_unlock(&module_mutex
);
1234 static const struct kernel_symbol
*
1235 resolve_symbol_wait(struct module
*mod
,
1236 const struct load_info
*info
,
1239 const struct kernel_symbol
*ksym
;
1240 char owner
[MODULE_NAME_LEN
];
1242 if (wait_event_interruptible_timeout(module_wq
,
1243 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1244 || PTR_ERR(ksym
) != -EBUSY
,
1246 printk(KERN_WARNING
"%s: gave up waiting for init of module %s.\n",
1253 * /sys/module/foo/sections stuff
1254 * J. Corbet <corbet@lwn.net>
1258 #ifdef CONFIG_KALLSYMS
1259 static inline bool sect_empty(const Elf_Shdr
*sect
)
1261 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1264 struct module_sect_attr
1266 struct module_attribute mattr
;
1268 unsigned long address
;
1271 struct module_sect_attrs
1273 struct attribute_group grp
;
1274 unsigned int nsections
;
1275 struct module_sect_attr attrs
[0];
1278 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1279 struct module_kobject
*mk
, char *buf
)
1281 struct module_sect_attr
*sattr
=
1282 container_of(mattr
, struct module_sect_attr
, mattr
);
1283 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1286 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1288 unsigned int section
;
1290 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1291 kfree(sect_attrs
->attrs
[section
].name
);
1295 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1297 unsigned int nloaded
= 0, i
, size
[2];
1298 struct module_sect_attrs
*sect_attrs
;
1299 struct module_sect_attr
*sattr
;
1300 struct attribute
**gattr
;
1302 /* Count loaded sections and allocate structures */
1303 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1304 if (!sect_empty(&info
->sechdrs
[i
]))
1306 size
[0] = ALIGN(sizeof(*sect_attrs
)
1307 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1308 sizeof(sect_attrs
->grp
.attrs
[0]));
1309 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1310 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1311 if (sect_attrs
== NULL
)
1314 /* Setup section attributes. */
1315 sect_attrs
->grp
.name
= "sections";
1316 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1318 sect_attrs
->nsections
= 0;
1319 sattr
= §_attrs
->attrs
[0];
1320 gattr
= §_attrs
->grp
.attrs
[0];
1321 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1322 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1323 if (sect_empty(sec
))
1325 sattr
->address
= sec
->sh_addr
;
1326 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1328 if (sattr
->name
== NULL
)
1330 sect_attrs
->nsections
++;
1331 sysfs_attr_init(&sattr
->mattr
.attr
);
1332 sattr
->mattr
.show
= module_sect_show
;
1333 sattr
->mattr
.store
= NULL
;
1334 sattr
->mattr
.attr
.name
= sattr
->name
;
1335 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1336 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1340 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1343 mod
->sect_attrs
= sect_attrs
;
1346 free_sect_attrs(sect_attrs
);
1349 static void remove_sect_attrs(struct module
*mod
)
1351 if (mod
->sect_attrs
) {
1352 sysfs_remove_group(&mod
->mkobj
.kobj
,
1353 &mod
->sect_attrs
->grp
);
1354 /* We are positive that no one is using any sect attrs
1355 * at this point. Deallocate immediately. */
1356 free_sect_attrs(mod
->sect_attrs
);
1357 mod
->sect_attrs
= NULL
;
1362 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1365 struct module_notes_attrs
{
1366 struct kobject
*dir
;
1368 struct bin_attribute attrs
[0];
1371 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1372 struct bin_attribute
*bin_attr
,
1373 char *buf
, loff_t pos
, size_t count
)
1376 * The caller checked the pos and count against our size.
1378 memcpy(buf
, bin_attr
->private + pos
, count
);
1382 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1385 if (notes_attrs
->dir
) {
1387 sysfs_remove_bin_file(notes_attrs
->dir
,
1388 ¬es_attrs
->attrs
[i
]);
1389 kobject_put(notes_attrs
->dir
);
1394 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1396 unsigned int notes
, loaded
, i
;
1397 struct module_notes_attrs
*notes_attrs
;
1398 struct bin_attribute
*nattr
;
1400 /* failed to create section attributes, so can't create notes */
1401 if (!mod
->sect_attrs
)
1404 /* Count notes sections and allocate structures. */
1406 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1407 if (!sect_empty(&info
->sechdrs
[i
]) &&
1408 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1414 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1415 + notes
* sizeof(notes_attrs
->attrs
[0]),
1417 if (notes_attrs
== NULL
)
1420 notes_attrs
->notes
= notes
;
1421 nattr
= ¬es_attrs
->attrs
[0];
1422 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1423 if (sect_empty(&info
->sechdrs
[i
]))
1425 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1426 sysfs_bin_attr_init(nattr
);
1427 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1428 nattr
->attr
.mode
= S_IRUGO
;
1429 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1430 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1431 nattr
->read
= module_notes_read
;
1437 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1438 if (!notes_attrs
->dir
)
1441 for (i
= 0; i
< notes
; ++i
)
1442 if (sysfs_create_bin_file(notes_attrs
->dir
,
1443 ¬es_attrs
->attrs
[i
]))
1446 mod
->notes_attrs
= notes_attrs
;
1450 free_notes_attrs(notes_attrs
, i
);
1453 static void remove_notes_attrs(struct module
*mod
)
1455 if (mod
->notes_attrs
)
1456 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1461 static inline void add_sect_attrs(struct module
*mod
,
1462 const struct load_info
*info
)
1466 static inline void remove_sect_attrs(struct module
*mod
)
1470 static inline void add_notes_attrs(struct module
*mod
,
1471 const struct load_info
*info
)
1475 static inline void remove_notes_attrs(struct module
*mod
)
1478 #endif /* CONFIG_KALLSYMS */
1480 static void add_usage_links(struct module
*mod
)
1482 #ifdef CONFIG_MODULE_UNLOAD
1483 struct module_use
*use
;
1486 mutex_lock(&module_mutex
);
1487 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1488 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1489 &mod
->mkobj
.kobj
, mod
->name
);
1491 mutex_unlock(&module_mutex
);
1495 static void del_usage_links(struct module
*mod
)
1497 #ifdef CONFIG_MODULE_UNLOAD
1498 struct module_use
*use
;
1500 mutex_lock(&module_mutex
);
1501 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1502 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1503 mutex_unlock(&module_mutex
);
1507 static int module_add_modinfo_attrs(struct module
*mod
)
1509 struct module_attribute
*attr
;
1510 struct module_attribute
*temp_attr
;
1514 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1515 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1517 if (!mod
->modinfo_attrs
)
1520 temp_attr
= mod
->modinfo_attrs
;
1521 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1523 (attr
->test
&& attr
->test(mod
))) {
1524 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1525 sysfs_attr_init(&temp_attr
->attr
);
1526 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1533 static void module_remove_modinfo_attrs(struct module
*mod
)
1535 struct module_attribute
*attr
;
1538 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1539 /* pick a field to test for end of list */
1540 if (!attr
->attr
.name
)
1542 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1546 kfree(mod
->modinfo_attrs
);
1549 static int mod_sysfs_init(struct module
*mod
)
1552 struct kobject
*kobj
;
1554 if (!module_sysfs_initialized
) {
1555 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1561 kobj
= kset_find_obj(module_kset
, mod
->name
);
1563 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1569 mod
->mkobj
.mod
= mod
;
1571 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1572 mod
->mkobj
.kobj
.kset
= module_kset
;
1573 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1576 kobject_put(&mod
->mkobj
.kobj
);
1578 /* delay uevent until full sysfs population */
1583 static int mod_sysfs_setup(struct module
*mod
,
1584 const struct load_info
*info
,
1585 struct kernel_param
*kparam
,
1586 unsigned int num_params
)
1590 err
= mod_sysfs_init(mod
);
1594 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1595 if (!mod
->holders_dir
) {
1600 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1602 goto out_unreg_holders
;
1604 err
= module_add_modinfo_attrs(mod
);
1606 goto out_unreg_param
;
1608 add_usage_links(mod
);
1609 add_sect_attrs(mod
, info
);
1610 add_notes_attrs(mod
, info
);
1612 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1616 module_param_sysfs_remove(mod
);
1618 kobject_put(mod
->holders_dir
);
1620 kobject_put(&mod
->mkobj
.kobj
);
1625 static void mod_sysfs_fini(struct module
*mod
)
1627 remove_notes_attrs(mod
);
1628 remove_sect_attrs(mod
);
1629 kobject_put(&mod
->mkobj
.kobj
);
1632 #else /* !CONFIG_SYSFS */
1634 static int mod_sysfs_setup(struct module
*mod
,
1635 const struct load_info
*info
,
1636 struct kernel_param
*kparam
,
1637 unsigned int num_params
)
1642 static void mod_sysfs_fini(struct module
*mod
)
1646 static void module_remove_modinfo_attrs(struct module
*mod
)
1650 static void del_usage_links(struct module
*mod
)
1654 #endif /* CONFIG_SYSFS */
1656 static void mod_sysfs_teardown(struct module
*mod
)
1658 del_usage_links(mod
);
1659 module_remove_modinfo_attrs(mod
);
1660 module_param_sysfs_remove(mod
);
1661 kobject_put(mod
->mkobj
.drivers_dir
);
1662 kobject_put(mod
->holders_dir
);
1663 mod_sysfs_fini(mod
);
1667 * unlink the module with the whole machine is stopped with interrupts off
1668 * - this defends against kallsyms not taking locks
1670 static int __unlink_module(void *_mod
)
1672 struct module
*mod
= _mod
;
1673 list_del(&mod
->list
);
1674 module_bug_cleanup(mod
);
1678 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1680 * LKM RO/NX protection: protect module's text/ro-data
1681 * from modification and any data from execution.
1683 void set_page_attributes(void *start
, void *end
, int (*set
)(unsigned long start
, int num_pages
))
1685 unsigned long begin_pfn
= PFN_DOWN((unsigned long)start
);
1686 unsigned long end_pfn
= PFN_DOWN((unsigned long)end
);
1688 if (end_pfn
> begin_pfn
)
1689 set(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1692 static void set_section_ro_nx(void *base
,
1693 unsigned long text_size
,
1694 unsigned long ro_size
,
1695 unsigned long total_size
)
1697 /* begin and end PFNs of the current subsection */
1698 unsigned long begin_pfn
;
1699 unsigned long end_pfn
;
1702 * Set RO for module text and RO-data:
1703 * - Always protect first page.
1704 * - Do not protect last partial page.
1707 set_page_attributes(base
, base
+ ro_size
, set_memory_ro
);
1710 * Set NX permissions for module data:
1711 * - Do not protect first partial page.
1712 * - Always protect last page.
1714 if (total_size
> text_size
) {
1715 begin_pfn
= PFN_UP((unsigned long)base
+ text_size
);
1716 end_pfn
= PFN_UP((unsigned long)base
+ total_size
);
1717 if (end_pfn
> begin_pfn
)
1718 set_memory_nx(begin_pfn
<< PAGE_SHIFT
, end_pfn
- begin_pfn
);
1722 static void unset_module_core_ro_nx(struct module
*mod
)
1724 set_page_attributes(mod
->module_core
+ mod
->core_text_size
,
1725 mod
->module_core
+ mod
->core_size
,
1727 set_page_attributes(mod
->module_core
,
1728 mod
->module_core
+ mod
->core_ro_size
,
1732 static void unset_module_init_ro_nx(struct module
*mod
)
1734 set_page_attributes(mod
->module_init
+ mod
->init_text_size
,
1735 mod
->module_init
+ mod
->init_size
,
1737 set_page_attributes(mod
->module_init
,
1738 mod
->module_init
+ mod
->init_ro_size
,
1742 /* Iterate through all modules and set each module's text as RW */
1743 void set_all_modules_text_rw(void)
1747 mutex_lock(&module_mutex
);
1748 list_for_each_entry_rcu(mod
, &modules
, list
) {
1749 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1750 set_page_attributes(mod
->module_core
,
1751 mod
->module_core
+ mod
->core_text_size
,
1754 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1755 set_page_attributes(mod
->module_init
,
1756 mod
->module_init
+ mod
->init_text_size
,
1760 mutex_unlock(&module_mutex
);
1763 /* Iterate through all modules and set each module's text as RO */
1764 void set_all_modules_text_ro(void)
1768 mutex_lock(&module_mutex
);
1769 list_for_each_entry_rcu(mod
, &modules
, list
) {
1770 if ((mod
->module_core
) && (mod
->core_text_size
)) {
1771 set_page_attributes(mod
->module_core
,
1772 mod
->module_core
+ mod
->core_text_size
,
1775 if ((mod
->module_init
) && (mod
->init_text_size
)) {
1776 set_page_attributes(mod
->module_init
,
1777 mod
->module_init
+ mod
->init_text_size
,
1781 mutex_unlock(&module_mutex
);
1784 static inline void set_section_ro_nx(void *base
, unsigned long text_size
, unsigned long ro_size
, unsigned long total_size
) { }
1785 static void unset_module_core_ro_nx(struct module
*mod
) { }
1786 static void unset_module_init_ro_nx(struct module
*mod
) { }
1789 void __weak
module_free(struct module
*mod
, void *module_region
)
1791 vfree(module_region
);
1794 void __weak
module_arch_cleanup(struct module
*mod
)
1798 /* Free a module, remove from lists, etc. */
1799 static void free_module(struct module
*mod
)
1801 trace_module_free(mod
);
1803 /* Delete from various lists */
1804 mutex_lock(&module_mutex
);
1805 stop_machine(__unlink_module
, mod
, NULL
);
1806 mutex_unlock(&module_mutex
);
1807 mod_sysfs_teardown(mod
);
1809 /* Remove dynamic debug info */
1810 ddebug_remove_module(mod
->name
);
1812 /* Arch-specific cleanup. */
1813 module_arch_cleanup(mod
);
1815 /* Module unload stuff */
1816 module_unload_free(mod
);
1818 /* Free any allocated parameters. */
1819 destroy_params(mod
->kp
, mod
->num_kp
);
1821 /* This may be NULL, but that's OK */
1822 unset_module_init_ro_nx(mod
);
1823 module_free(mod
, mod
->module_init
);
1825 percpu_modfree(mod
);
1827 /* Free lock-classes: */
1828 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1830 /* Finally, free the core (containing the module structure) */
1831 unset_module_core_ro_nx(mod
);
1832 module_free(mod
, mod
->module_core
);
1835 update_protections(current
->mm
);
1839 void *__symbol_get(const char *symbol
)
1841 struct module
*owner
;
1842 const struct kernel_symbol
*sym
;
1845 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
1846 if (sym
&& strong_try_module_get(owner
))
1850 return sym
? (void *)sym
->value
: NULL
;
1852 EXPORT_SYMBOL_GPL(__symbol_get
);
1855 * Ensure that an exported symbol [global namespace] does not already exist
1856 * in the kernel or in some other module's exported symbol table.
1858 * You must hold the module_mutex.
1860 static int verify_export_symbols(struct module
*mod
)
1863 struct module
*owner
;
1864 const struct kernel_symbol
*s
;
1866 const struct kernel_symbol
*sym
;
1869 { mod
->syms
, mod
->num_syms
},
1870 { mod
->gpl_syms
, mod
->num_gpl_syms
},
1871 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
1872 #ifdef CONFIG_UNUSED_SYMBOLS
1873 { mod
->unused_syms
, mod
->num_unused_syms
},
1874 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
1878 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
1879 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
1880 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
1882 "%s: exports duplicate symbol %s"
1884 mod
->name
, s
->name
, module_name(owner
));
1892 /* Change all symbols so that st_value encodes the pointer directly. */
1893 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
1895 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
1896 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
1897 unsigned long secbase
;
1900 const struct kernel_symbol
*ksym
;
1902 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
1903 const char *name
= info
->strtab
+ sym
[i
].st_name
;
1905 switch (sym
[i
].st_shndx
) {
1907 /* We compiled with -fno-common. These are not
1908 supposed to happen. */
1909 pr_debug("Common symbol: %s\n", name
);
1910 printk("%s: please compile with -fno-common\n",
1916 /* Don't need to do anything */
1917 pr_debug("Absolute symbol: 0x%08lx\n",
1918 (long)sym
[i
].st_value
);
1922 ksym
= resolve_symbol_wait(mod
, info
, name
);
1923 /* Ok if resolved. */
1924 if (ksym
&& !IS_ERR(ksym
)) {
1925 sym
[i
].st_value
= ksym
->value
;
1930 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1933 printk(KERN_WARNING
"%s: Unknown symbol %s (err %li)\n",
1934 mod
->name
, name
, PTR_ERR(ksym
));
1935 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
1939 /* Divert to percpu allocation if a percpu var. */
1940 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
1941 secbase
= (unsigned long)mod_percpu(mod
);
1943 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1944 sym
[i
].st_value
+= secbase
;
1952 int __weak
apply_relocate(Elf_Shdr
*sechdrs
,
1954 unsigned int symindex
,
1955 unsigned int relsec
,
1958 pr_err("module %s: REL relocation unsupported\n", me
->name
);
1962 int __weak
apply_relocate_add(Elf_Shdr
*sechdrs
,
1964 unsigned int symindex
,
1965 unsigned int relsec
,
1968 pr_err("module %s: RELA relocation unsupported\n", me
->name
);
1972 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
1977 /* Now do relocations. */
1978 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
1979 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
1981 /* Not a valid relocation section? */
1982 if (infosec
>= info
->hdr
->e_shnum
)
1985 /* Don't bother with non-allocated sections */
1986 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
1989 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
1990 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
1991 info
->index
.sym
, i
, mod
);
1992 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
1993 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
1994 info
->index
.sym
, i
, mod
);
2001 /* Additional bytes needed by arch in front of individual sections */
2002 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2003 unsigned int section
)
2005 /* default implementation just returns zero */
2009 /* Update size with this section: return offset. */
2010 static long get_offset(struct module
*mod
, unsigned int *size
,
2011 Elf_Shdr
*sechdr
, unsigned int section
)
2015 *size
+= arch_mod_section_prepend(mod
, section
);
2016 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2017 *size
= ret
+ sechdr
->sh_size
;
2021 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2022 might -- code, read-only data, read-write data, small data. Tally
2023 sizes, and place the offsets into sh_entsize fields: high bit means it
2025 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2027 static unsigned long const masks
[][2] = {
2028 /* NOTE: all executable code must be the first section
2029 * in this array; otherwise modify the text_size
2030 * finder in the two loops below */
2031 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2032 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2033 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2034 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2038 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2039 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2041 pr_debug("Core section allocation order:\n");
2042 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2043 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2044 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2045 const char *sname
= info
->secstrings
+ s
->sh_name
;
2047 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2048 || (s
->sh_flags
& masks
[m
][1])
2049 || s
->sh_entsize
!= ~0UL
2050 || strstarts(sname
, ".init"))
2052 s
->sh_entsize
= get_offset(mod
, &mod
->core_size
, s
, i
);
2053 pr_debug("\t%s\n", sname
);
2056 case 0: /* executable */
2057 mod
->core_size
= debug_align(mod
->core_size
);
2058 mod
->core_text_size
= mod
->core_size
;
2060 case 1: /* RO: text and ro-data */
2061 mod
->core_size
= debug_align(mod
->core_size
);
2062 mod
->core_ro_size
= mod
->core_size
;
2064 case 3: /* whole core */
2065 mod
->core_size
= debug_align(mod
->core_size
);
2070 pr_debug("Init section allocation order:\n");
2071 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2072 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2073 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2074 const char *sname
= info
->secstrings
+ s
->sh_name
;
2076 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2077 || (s
->sh_flags
& masks
[m
][1])
2078 || s
->sh_entsize
!= ~0UL
2079 || !strstarts(sname
, ".init"))
2081 s
->sh_entsize
= (get_offset(mod
, &mod
->init_size
, s
, i
)
2082 | INIT_OFFSET_MASK
);
2083 pr_debug("\t%s\n", sname
);
2086 case 0: /* executable */
2087 mod
->init_size
= debug_align(mod
->init_size
);
2088 mod
->init_text_size
= mod
->init_size
;
2090 case 1: /* RO: text and ro-data */
2091 mod
->init_size
= debug_align(mod
->init_size
);
2092 mod
->init_ro_size
= mod
->init_size
;
2094 case 3: /* whole init */
2095 mod
->init_size
= debug_align(mod
->init_size
);
2101 static void set_license(struct module
*mod
, const char *license
)
2104 license
= "unspecified";
2106 if (!license_is_gpl_compatible(license
)) {
2107 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2108 printk(KERN_WARNING
"%s: module license '%s' taints "
2109 "kernel.\n", mod
->name
, license
);
2110 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2114 /* Parse tag=value strings from .modinfo section */
2115 static char *next_string(char *string
, unsigned long *secsize
)
2117 /* Skip non-zero chars */
2120 if ((*secsize
)-- <= 1)
2124 /* Skip any zero padding. */
2125 while (!string
[0]) {
2127 if ((*secsize
)-- <= 1)
2133 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2136 unsigned int taglen
= strlen(tag
);
2137 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2138 unsigned long size
= infosec
->sh_size
;
2140 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2141 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2142 return p
+ taglen
+ 1;
2147 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2149 struct module_attribute
*attr
;
2152 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2154 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2158 static void free_modinfo(struct module
*mod
)
2160 struct module_attribute
*attr
;
2163 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2169 #ifdef CONFIG_KALLSYMS
2171 /* lookup symbol in given range of kernel_symbols */
2172 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2173 const struct kernel_symbol
*start
,
2174 const struct kernel_symbol
*stop
)
2176 return bsearch(name
, start
, stop
- start
,
2177 sizeof(struct kernel_symbol
), cmp_name
);
2180 static int is_exported(const char *name
, unsigned long value
,
2181 const struct module
*mod
)
2183 const struct kernel_symbol
*ks
;
2185 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2187 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2188 return ks
!= NULL
&& ks
->value
== value
;
2192 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2194 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2196 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2197 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2202 if (sym
->st_shndx
== SHN_UNDEF
)
2204 if (sym
->st_shndx
== SHN_ABS
)
2206 if (sym
->st_shndx
>= SHN_LORESERVE
)
2208 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2210 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2211 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2212 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2214 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2219 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2220 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2225 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2232 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2235 const Elf_Shdr
*sec
;
2237 if (src
->st_shndx
== SHN_UNDEF
2238 || src
->st_shndx
>= shnum
2242 sec
= sechdrs
+ src
->st_shndx
;
2243 if (!(sec
->sh_flags
& SHF_ALLOC
)
2244 #ifndef CONFIG_KALLSYMS_ALL
2245 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2247 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2254 * We only allocate and copy the strings needed by the parts of symtab
2255 * we keep. This is simple, but has the effect of making multiple
2256 * copies of duplicates. We could be more sophisticated, see
2257 * linux-kernel thread starting with
2258 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2260 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2262 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2263 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2265 unsigned int i
, nsrc
, ndst
, strtab_size
;
2267 /* Put symbol section at end of init part of module. */
2268 symsect
->sh_flags
|= SHF_ALLOC
;
2269 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, symsect
,
2270 info
->index
.sym
) | INIT_OFFSET_MASK
;
2271 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2273 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2274 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2276 /* Compute total space required for the core symbols' strtab. */
2277 for (ndst
= i
= strtab_size
= 1; i
< nsrc
; ++i
, ++src
)
2278 if (is_core_symbol(src
, info
->sechdrs
, info
->hdr
->e_shnum
)) {
2279 strtab_size
+= strlen(&info
->strtab
[src
->st_name
]) + 1;
2283 /* Append room for core symbols at end of core part. */
2284 info
->symoffs
= ALIGN(mod
->core_size
, symsect
->sh_addralign
?: 1);
2285 info
->stroffs
= mod
->core_size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2286 mod
->core_size
+= strtab_size
;
2288 /* Put string table section at end of init part of module. */
2289 strsect
->sh_flags
|= SHF_ALLOC
;
2290 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_size
, strsect
,
2291 info
->index
.str
) | INIT_OFFSET_MASK
;
2292 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2295 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2297 unsigned int i
, ndst
;
2301 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2303 mod
->symtab
= (void *)symsec
->sh_addr
;
2304 mod
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2305 /* Make sure we get permanent strtab: don't use info->strtab. */
2306 mod
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2308 /* Set types up while we still have access to sections. */
2309 for (i
= 0; i
< mod
->num_symtab
; i
++)
2310 mod
->symtab
[i
].st_info
= elf_type(&mod
->symtab
[i
], info
);
2312 mod
->core_symtab
= dst
= mod
->module_core
+ info
->symoffs
;
2313 mod
->core_strtab
= s
= mod
->module_core
+ info
->stroffs
;
2317 for (ndst
= i
= 1; i
< mod
->num_symtab
; ++i
, ++src
) {
2318 if (!is_core_symbol(src
, info
->sechdrs
, info
->hdr
->e_shnum
))
2322 dst
[ndst
++].st_name
= s
- mod
->core_strtab
;
2323 s
+= strlcpy(s
, &mod
->strtab
[src
->st_name
], KSYM_NAME_LEN
) + 1;
2325 mod
->core_num_syms
= ndst
;
2328 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2332 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2335 #endif /* CONFIG_KALLSYMS */
2337 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2341 #ifdef CONFIG_DYNAMIC_DEBUG
2342 if (ddebug_add_module(debug
, num
, debug
->modname
))
2343 printk(KERN_ERR
"dynamic debug error adding module: %s\n",
2348 static void dynamic_debug_remove(struct _ddebug
*debug
)
2351 ddebug_remove_module(debug
->modname
);
2354 void * __weak
module_alloc(unsigned long size
)
2356 return size
== 0 ? NULL
: vmalloc_exec(size
);
2359 static void *module_alloc_update_bounds(unsigned long size
)
2361 void *ret
= module_alloc(size
);
2364 mutex_lock(&module_mutex
);
2365 /* Update module bounds. */
2366 if ((unsigned long)ret
< module_addr_min
)
2367 module_addr_min
= (unsigned long)ret
;
2368 if ((unsigned long)ret
+ size
> module_addr_max
)
2369 module_addr_max
= (unsigned long)ret
+ size
;
2370 mutex_unlock(&module_mutex
);
2375 #ifdef CONFIG_DEBUG_KMEMLEAK
2376 static void kmemleak_load_module(const struct module
*mod
,
2377 const struct load_info
*info
)
2381 /* only scan the sections containing data */
2382 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2384 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2385 const char *name
= info
->secstrings
+ info
->sechdrs
[i
].sh_name
;
2386 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
))
2388 if (!strstarts(name
, ".data") && !strstarts(name
, ".bss"))
2391 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2392 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2396 static inline void kmemleak_load_module(const struct module
*mod
,
2397 const struct load_info
*info
)
2402 /* Sets info->hdr and info->len. */
2403 static int copy_and_check(struct load_info
*info
,
2404 const void __user
*umod
, unsigned long len
,
2405 const char __user
*uargs
)
2410 if (len
< sizeof(*hdr
))
2413 /* Suck in entire file: we'll want most of it. */
2414 if ((hdr
= vmalloc(len
)) == NULL
)
2417 if (copy_from_user(hdr
, umod
, len
) != 0) {
2422 /* Sanity checks against insmoding binaries or wrong arch,
2423 weird elf version */
2424 if (memcmp(hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2425 || hdr
->e_type
!= ET_REL
2426 || !elf_check_arch(hdr
)
2427 || hdr
->e_shentsize
!= sizeof(Elf_Shdr
)) {
2432 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
)) {
2446 static void free_copy(struct load_info
*info
)
2451 static int rewrite_section_headers(struct load_info
*info
)
2455 /* This should always be true, but let's be sure. */
2456 info
->sechdrs
[0].sh_addr
= 0;
2458 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2459 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2460 if (shdr
->sh_type
!= SHT_NOBITS
2461 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2462 printk(KERN_ERR
"Module len %lu truncated\n",
2467 /* Mark all sections sh_addr with their address in the
2469 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2471 #ifndef CONFIG_MODULE_UNLOAD
2472 /* Don't load .exit sections */
2473 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2474 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2478 /* Track but don't keep modinfo and version sections. */
2479 info
->index
.vers
= find_sec(info
, "__versions");
2480 info
->index
.info
= find_sec(info
, ".modinfo");
2481 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2482 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2487 * Set up our basic convenience variables (pointers to section headers,
2488 * search for module section index etc), and do some basic section
2491 * Return the temporary module pointer (we'll replace it with the final
2492 * one when we move the module sections around).
2494 static struct module
*setup_load_info(struct load_info
*info
)
2500 /* Set up the convenience variables */
2501 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2502 info
->secstrings
= (void *)info
->hdr
2503 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2505 err
= rewrite_section_headers(info
);
2507 return ERR_PTR(err
);
2509 /* Find internal symbols and strings. */
2510 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2511 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2512 info
->index
.sym
= i
;
2513 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2514 info
->strtab
= (char *)info
->hdr
2515 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2520 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2521 if (!info
->index
.mod
) {
2522 printk(KERN_WARNING
"No module found in object\n");
2523 return ERR_PTR(-ENOEXEC
);
2525 /* This is temporary: point mod into copy of data. */
2526 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2528 if (info
->index
.sym
== 0) {
2529 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
2531 return ERR_PTR(-ENOEXEC
);
2534 info
->index
.pcpu
= find_pcpusec(info
);
2536 /* Check module struct version now, before we try to use module. */
2537 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2538 return ERR_PTR(-ENOEXEC
);
2543 static int check_modinfo(struct module
*mod
, struct load_info
*info
)
2545 const char *modmagic
= get_modinfo(info
, "vermagic");
2548 /* This is allowed: modprobe --force will invalidate it. */
2550 err
= try_to_force_load(mod
, "bad vermagic");
2553 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2554 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
2555 mod
->name
, modmagic
, vermagic
);
2559 if (!get_modinfo(info
, "intree"))
2560 add_taint_module(mod
, TAINT_OOT_MODULE
);
2562 if (get_modinfo(info
, "staging")) {
2563 add_taint_module(mod
, TAINT_CRAP
);
2564 printk(KERN_WARNING
"%s: module is from the staging directory,"
2565 " the quality is unknown, you have been warned.\n",
2569 /* Set up license info based on the info section */
2570 set_license(mod
, get_modinfo(info
, "license"));
2575 static void find_module_sections(struct module
*mod
, struct load_info
*info
)
2577 mod
->kp
= section_objs(info
, "__param",
2578 sizeof(*mod
->kp
), &mod
->num_kp
);
2579 mod
->syms
= section_objs(info
, "__ksymtab",
2580 sizeof(*mod
->syms
), &mod
->num_syms
);
2581 mod
->crcs
= section_addr(info
, "__kcrctab");
2582 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2583 sizeof(*mod
->gpl_syms
),
2584 &mod
->num_gpl_syms
);
2585 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2586 mod
->gpl_future_syms
= section_objs(info
,
2587 "__ksymtab_gpl_future",
2588 sizeof(*mod
->gpl_future_syms
),
2589 &mod
->num_gpl_future_syms
);
2590 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2592 #ifdef CONFIG_UNUSED_SYMBOLS
2593 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2594 sizeof(*mod
->unused_syms
),
2595 &mod
->num_unused_syms
);
2596 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2597 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2598 sizeof(*mod
->unused_gpl_syms
),
2599 &mod
->num_unused_gpl_syms
);
2600 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2602 #ifdef CONFIG_CONSTRUCTORS
2603 mod
->ctors
= section_objs(info
, ".ctors",
2604 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2607 #ifdef CONFIG_TRACEPOINTS
2608 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2609 sizeof(*mod
->tracepoints_ptrs
),
2610 &mod
->num_tracepoints
);
2612 #ifdef HAVE_JUMP_LABEL
2613 mod
->jump_entries
= section_objs(info
, "__jump_table",
2614 sizeof(*mod
->jump_entries
),
2615 &mod
->num_jump_entries
);
2617 #ifdef CONFIG_EVENT_TRACING
2618 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2619 sizeof(*mod
->trace_events
),
2620 &mod
->num_trace_events
);
2622 * This section contains pointers to allocated objects in the trace
2623 * code and not scanning it leads to false positives.
2625 kmemleak_scan_area(mod
->trace_events
, sizeof(*mod
->trace_events
) *
2626 mod
->num_trace_events
, GFP_KERNEL
);
2628 #ifdef CONFIG_TRACING
2629 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2630 sizeof(*mod
->trace_bprintk_fmt_start
),
2631 &mod
->num_trace_bprintk_fmt
);
2633 * This section contains pointers to allocated objects in the trace
2634 * code and not scanning it leads to false positives.
2636 kmemleak_scan_area(mod
->trace_bprintk_fmt_start
,
2637 sizeof(*mod
->trace_bprintk_fmt_start
) *
2638 mod
->num_trace_bprintk_fmt
, GFP_KERNEL
);
2640 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2641 /* sechdrs[0].sh_size is always zero */
2642 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2643 sizeof(*mod
->ftrace_callsites
),
2644 &mod
->num_ftrace_callsites
);
2647 mod
->extable
= section_objs(info
, "__ex_table",
2648 sizeof(*mod
->extable
), &mod
->num_exentries
);
2650 if (section_addr(info
, "__obsparm"))
2651 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2654 info
->debug
= section_objs(info
, "__verbose",
2655 sizeof(*info
->debug
), &info
->num_debug
);
2658 static int move_module(struct module
*mod
, struct load_info
*info
)
2663 /* Do the allocs. */
2664 ptr
= module_alloc_update_bounds(mod
->core_size
);
2666 * The pointer to this block is stored in the module structure
2667 * which is inside the block. Just mark it as not being a
2670 kmemleak_not_leak(ptr
);
2674 memset(ptr
, 0, mod
->core_size
);
2675 mod
->module_core
= ptr
;
2677 ptr
= module_alloc_update_bounds(mod
->init_size
);
2679 * The pointer to this block is stored in the module structure
2680 * which is inside the block. This block doesn't need to be
2681 * scanned as it contains data and code that will be freed
2682 * after the module is initialized.
2684 kmemleak_ignore(ptr
);
2685 if (!ptr
&& mod
->init_size
) {
2686 module_free(mod
, mod
->module_core
);
2689 memset(ptr
, 0, mod
->init_size
);
2690 mod
->module_init
= ptr
;
2692 /* Transfer each section which specifies SHF_ALLOC */
2693 pr_debug("final section addresses:\n");
2694 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
2696 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2698 if (!(shdr
->sh_flags
& SHF_ALLOC
))
2701 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
2702 dest
= mod
->module_init
2703 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
2705 dest
= mod
->module_core
+ shdr
->sh_entsize
;
2707 if (shdr
->sh_type
!= SHT_NOBITS
)
2708 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
2709 /* Update sh_addr to point to copy in image. */
2710 shdr
->sh_addr
= (unsigned long)dest
;
2711 pr_debug("\t0x%lx %s\n",
2712 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
2718 static int check_module_license_and_versions(struct module
*mod
)
2721 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2722 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2723 * using GPL-only symbols it needs.
2725 if (strcmp(mod
->name
, "ndiswrapper") == 0)
2726 add_taint(TAINT_PROPRIETARY_MODULE
);
2728 /* driverloader was caught wrongly pretending to be under GPL */
2729 if (strcmp(mod
->name
, "driverloader") == 0)
2730 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
2732 #ifdef CONFIG_MODVERSIONS
2733 if ((mod
->num_syms
&& !mod
->crcs
)
2734 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
2735 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
2736 #ifdef CONFIG_UNUSED_SYMBOLS
2737 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
2738 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
2741 return try_to_force_load(mod
,
2742 "no versions for exported symbols");
2748 static void flush_module_icache(const struct module
*mod
)
2750 mm_segment_t old_fs
;
2752 /* flush the icache in correct context */
2757 * Flush the instruction cache, since we've played with text.
2758 * Do it before processing of module parameters, so the module
2759 * can provide parameter accessor functions of its own.
2761 if (mod
->module_init
)
2762 flush_icache_range((unsigned long)mod
->module_init
,
2763 (unsigned long)mod
->module_init
2765 flush_icache_range((unsigned long)mod
->module_core
,
2766 (unsigned long)mod
->module_core
+ mod
->core_size
);
2771 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
2779 static struct module
*layout_and_allocate(struct load_info
*info
)
2781 /* Module within temporary copy. */
2786 mod
= setup_load_info(info
);
2790 err
= check_modinfo(mod
, info
);
2792 return ERR_PTR(err
);
2794 /* Allow arches to frob section contents and sizes. */
2795 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
2796 info
->secstrings
, mod
);
2800 pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
2801 if (pcpusec
->sh_size
) {
2802 /* We have a special allocation for this section. */
2803 err
= percpu_modalloc(mod
,
2804 pcpusec
->sh_size
, pcpusec
->sh_addralign
);
2807 pcpusec
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2810 /* Determine total sizes, and put offsets in sh_entsize. For now
2811 this is done generically; there doesn't appear to be any
2812 special cases for the architectures. */
2813 layout_sections(mod
, info
);
2814 layout_symtab(mod
, info
);
2816 /* Allocate and move to the final place */
2817 err
= move_module(mod
, info
);
2821 /* Module has been copied to its final place now: return it. */
2822 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2823 kmemleak_load_module(mod
, info
);
2827 percpu_modfree(mod
);
2829 return ERR_PTR(err
);
2832 /* mod is no longer valid after this! */
2833 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
2835 percpu_modfree(mod
);
2836 module_free(mod
, mod
->module_init
);
2837 module_free(mod
, mod
->module_core
);
2840 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
2841 const Elf_Shdr
*sechdrs
,
2847 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
2849 /* Sort exception table now relocations are done. */
2850 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
2852 /* Copy relocated percpu area over. */
2853 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
2854 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
2856 /* Setup kallsyms-specific fields. */
2857 add_kallsyms(mod
, info
);
2859 /* Arch-specific module finalizing. */
2860 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
2863 /* Allocate and load the module: note that size of section 0 is always
2864 zero, and we rely on this for optional sections. */
2865 static struct module
*load_module(void __user
*umod
,
2867 const char __user
*uargs
)
2869 struct load_info info
= { NULL
, };
2873 pr_debug("load_module: umod=%p, len=%lu, uargs=%p\n",
2876 /* Copy in the blobs from userspace, check they are vaguely sane. */
2877 err
= copy_and_check(&info
, umod
, len
, uargs
);
2879 return ERR_PTR(err
);
2881 /* Figure out module layout, and allocate all the memory. */
2882 mod
= layout_and_allocate(&info
);
2888 /* Now module is in final location, initialize linked lists, etc. */
2889 err
= module_unload_init(mod
);
2893 /* Now we've got everything in the final locations, we can
2894 * find optional sections. */
2895 find_module_sections(mod
, &info
);
2897 err
= check_module_license_and_versions(mod
);
2901 /* Set up MODINFO_ATTR fields */
2902 setup_modinfo(mod
, &info
);
2904 /* Fix up syms, so that st_value is a pointer to location. */
2905 err
= simplify_symbols(mod
, &info
);
2909 err
= apply_relocations(mod
, &info
);
2913 err
= post_relocation(mod
, &info
);
2917 flush_module_icache(mod
);
2919 /* Now copy in args */
2920 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
2921 if (IS_ERR(mod
->args
)) {
2922 err
= PTR_ERR(mod
->args
);
2923 goto free_arch_cleanup
;
2926 /* Mark state as coming so strong_try_module_get() ignores us. */
2927 mod
->state
= MODULE_STATE_COMING
;
2929 /* Now sew it into the lists so we can get lockdep and oops
2930 * info during argument parsing. No one should access us, since
2931 * strong_try_module_get() will fail.
2932 * lockdep/oops can run asynchronous, so use the RCU list insertion
2933 * function to insert in a way safe to concurrent readers.
2934 * The mutex protects against concurrent writers.
2936 mutex_lock(&module_mutex
);
2937 if (find_module(mod
->name
)) {
2942 /* This has to be done once we're sure module name is unique. */
2943 dynamic_debug_setup(info
.debug
, info
.num_debug
);
2945 /* Find duplicate symbols */
2946 err
= verify_export_symbols(mod
);
2950 module_bug_finalize(info
.hdr
, info
.sechdrs
, mod
);
2951 list_add_rcu(&mod
->list
, &modules
);
2952 mutex_unlock(&module_mutex
);
2954 /* Module is ready to execute: parsing args may do that. */
2955 err
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
2956 -32768, 32767, &ddebug_dyndbg_module_param_cb
);
2960 /* Link in to syfs. */
2961 err
= mod_sysfs_setup(mod
, &info
, mod
->kp
, mod
->num_kp
);
2965 /* Get rid of temporary copy. */
2969 trace_module_load(mod
);
2973 mutex_lock(&module_mutex
);
2974 /* Unlink carefully: kallsyms could be walking list. */
2975 list_del_rcu(&mod
->list
);
2976 module_bug_cleanup(mod
);
2979 dynamic_debug_remove(info
.debug
);
2981 mutex_unlock(&module_mutex
);
2982 synchronize_sched();
2985 module_arch_cleanup(mod
);
2989 module_unload_free(mod
);
2991 module_deallocate(mod
, &info
);
2994 return ERR_PTR(err
);
2997 /* Call module constructors. */
2998 static void do_mod_ctors(struct module
*mod
)
3000 #ifdef CONFIG_CONSTRUCTORS
3003 for (i
= 0; i
< mod
->num_ctors
; i
++)
3008 /* This is where the real work happens */
3009 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3010 unsigned long, len
, const char __user
*, uargs
)
3015 /* Must have permission */
3016 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3019 /* Do all the hard work */
3020 mod
= load_module(umod
, len
, uargs
);
3022 return PTR_ERR(mod
);
3024 blocking_notifier_call_chain(&module_notify_list
,
3025 MODULE_STATE_COMING
, mod
);
3027 /* Set RO and NX regions for core */
3028 set_section_ro_nx(mod
->module_core
,
3029 mod
->core_text_size
,
3033 /* Set RO and NX regions for init */
3034 set_section_ro_nx(mod
->module_init
,
3035 mod
->init_text_size
,
3040 /* Start the module */
3041 if (mod
->init
!= NULL
)
3042 ret
= do_one_initcall(mod
->init
);
3044 /* Init routine failed: abort. Try to protect us from
3045 buggy refcounters. */
3046 mod
->state
= MODULE_STATE_GOING
;
3047 synchronize_sched();
3049 blocking_notifier_call_chain(&module_notify_list
,
3050 MODULE_STATE_GOING
, mod
);
3052 wake_up(&module_wq
);
3057 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3058 "%s: loading module anyway...\n",
3059 __func__
, mod
->name
, ret
,
3064 /* Now it's a first class citizen! Wake up anyone waiting for it. */
3065 mod
->state
= MODULE_STATE_LIVE
;
3066 wake_up(&module_wq
);
3067 blocking_notifier_call_chain(&module_notify_list
,
3068 MODULE_STATE_LIVE
, mod
);
3070 /* We need to finish all async code before the module init sequence is done */
3071 async_synchronize_full();
3073 mutex_lock(&module_mutex
);
3074 /* Drop initial reference. */
3076 trim_init_extable(mod
);
3077 #ifdef CONFIG_KALLSYMS
3078 mod
->num_symtab
= mod
->core_num_syms
;
3079 mod
->symtab
= mod
->core_symtab
;
3080 mod
->strtab
= mod
->core_strtab
;
3082 unset_module_init_ro_nx(mod
);
3083 module_free(mod
, mod
->module_init
);
3084 mod
->module_init
= NULL
;
3086 mod
->init_ro_size
= 0;
3087 mod
->init_text_size
= 0;
3088 mutex_unlock(&module_mutex
);
3093 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3095 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3098 #ifdef CONFIG_KALLSYMS
3100 * This ignores the intensely annoying "mapping symbols" found
3101 * in ARM ELF files: $a, $t and $d.
3103 static inline int is_arm_mapping_symbol(const char *str
)
3105 return str
[0] == '$' && strchr("atd", str
[1])
3106 && (str
[2] == '\0' || str
[2] == '.');
3109 static const char *get_ksymbol(struct module
*mod
,
3111 unsigned long *size
,
3112 unsigned long *offset
)
3114 unsigned int i
, best
= 0;
3115 unsigned long nextval
;
3117 /* At worse, next value is at end of module */
3118 if (within_module_init(addr
, mod
))
3119 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
3121 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
3123 /* Scan for closest preceding symbol, and next symbol. (ELF
3124 starts real symbols at 1). */
3125 for (i
= 1; i
< mod
->num_symtab
; i
++) {
3126 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3129 /* We ignore unnamed symbols: they're uninformative
3130 * and inserted at a whim. */
3131 if (mod
->symtab
[i
].st_value
<= addr
3132 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
3133 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3134 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3136 if (mod
->symtab
[i
].st_value
> addr
3137 && mod
->symtab
[i
].st_value
< nextval
3138 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
3139 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
3140 nextval
= mod
->symtab
[i
].st_value
;
3147 *size
= nextval
- mod
->symtab
[best
].st_value
;
3149 *offset
= addr
- mod
->symtab
[best
].st_value
;
3150 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
3153 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3154 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3155 const char *module_address_lookup(unsigned long addr
,
3156 unsigned long *size
,
3157 unsigned long *offset
,
3162 const char *ret
= NULL
;
3165 list_for_each_entry_rcu(mod
, &modules
, list
) {
3166 if (within_module_init(addr
, mod
) ||
3167 within_module_core(addr
, mod
)) {
3169 *modname
= mod
->name
;
3170 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3174 /* Make a copy in here where it's safe */
3176 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3183 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3188 list_for_each_entry_rcu(mod
, &modules
, list
) {
3189 if (within_module_init(addr
, mod
) ||
3190 within_module_core(addr
, mod
)) {
3193 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3196 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3206 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3207 unsigned long *offset
, char *modname
, char *name
)
3212 list_for_each_entry_rcu(mod
, &modules
, list
) {
3213 if (within_module_init(addr
, mod
) ||
3214 within_module_core(addr
, mod
)) {
3217 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3221 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3223 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3233 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3234 char *name
, char *module_name
, int *exported
)
3239 list_for_each_entry_rcu(mod
, &modules
, list
) {
3240 if (symnum
< mod
->num_symtab
) {
3241 *value
= mod
->symtab
[symnum
].st_value
;
3242 *type
= mod
->symtab
[symnum
].st_info
;
3243 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
3245 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3246 *exported
= is_exported(name
, *value
, mod
);
3250 symnum
-= mod
->num_symtab
;
3256 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3260 for (i
= 0; i
< mod
->num_symtab
; i
++)
3261 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
3262 mod
->symtab
[i
].st_info
!= 'U')
3263 return mod
->symtab
[i
].st_value
;
3267 /* Look for this name: can be of form module:name. */
3268 unsigned long module_kallsyms_lookup_name(const char *name
)
3272 unsigned long ret
= 0;
3274 /* Don't lock: we're in enough trouble already. */
3276 if ((colon
= strchr(name
, ':')) != NULL
) {
3278 if ((mod
= find_module(name
)) != NULL
)
3279 ret
= mod_find_symname(mod
, colon
+1);
3282 list_for_each_entry_rcu(mod
, &modules
, list
)
3283 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3290 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3291 struct module
*, unsigned long),
3298 list_for_each_entry(mod
, &modules
, list
) {
3299 for (i
= 0; i
< mod
->num_symtab
; i
++) {
3300 ret
= fn(data
, mod
->strtab
+ mod
->symtab
[i
].st_name
,
3301 mod
, mod
->symtab
[i
].st_value
);
3308 #endif /* CONFIG_KALLSYMS */
3310 static char *module_flags(struct module
*mod
, char *buf
)
3315 mod
->state
== MODULE_STATE_GOING
||
3316 mod
->state
== MODULE_STATE_COMING
) {
3318 bx
+= module_flags_taint(mod
, buf
+ bx
);
3319 /* Show a - for module-is-being-unloaded */
3320 if (mod
->state
== MODULE_STATE_GOING
)
3322 /* Show a + for module-is-being-loaded */
3323 if (mod
->state
== MODULE_STATE_COMING
)
3332 #ifdef CONFIG_PROC_FS
3333 /* Called by the /proc file system to return a list of modules. */
3334 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3336 mutex_lock(&module_mutex
);
3337 return seq_list_start(&modules
, *pos
);
3340 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3342 return seq_list_next(p
, &modules
, pos
);
3345 static void m_stop(struct seq_file
*m
, void *p
)
3347 mutex_unlock(&module_mutex
);
3350 static int m_show(struct seq_file
*m
, void *p
)
3352 struct module
*mod
= list_entry(p
, struct module
, list
);
3355 seq_printf(m
, "%s %u",
3356 mod
->name
, mod
->init_size
+ mod
->core_size
);
3357 print_unload_info(m
, mod
);
3359 /* Informative for users. */
3360 seq_printf(m
, " %s",
3361 mod
->state
== MODULE_STATE_GOING
? "Unloading":
3362 mod
->state
== MODULE_STATE_COMING
? "Loading":
3364 /* Used by oprofile and other similar tools. */
3365 seq_printf(m
, " 0x%pK", mod
->module_core
);
3369 seq_printf(m
, " %s", module_flags(mod
, buf
));
3371 seq_printf(m
, "\n");
3375 /* Format: modulename size refcount deps address
3377 Where refcount is a number or -, and deps is a comma-separated list
3380 static const struct seq_operations modules_op
= {
3387 static int modules_open(struct inode
*inode
, struct file
*file
)
3389 return seq_open(file
, &modules_op
);
3392 static const struct file_operations proc_modules_operations
= {
3393 .open
= modules_open
,
3395 .llseek
= seq_lseek
,
3396 .release
= seq_release
,
3399 static int __init
proc_modules_init(void)
3401 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3404 module_init(proc_modules_init
);
3407 /* Given an address, look for it in the module exception tables. */
3408 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3410 const struct exception_table_entry
*e
= NULL
;
3414 list_for_each_entry_rcu(mod
, &modules
, list
) {
3415 if (mod
->num_exentries
== 0)
3418 e
= search_extable(mod
->extable
,
3419 mod
->extable
+ mod
->num_exentries
- 1,
3426 /* Now, if we found one, we are running inside it now, hence
3427 we cannot unload the module, hence no refcnt needed. */
3432 * is_module_address - is this address inside a module?
3433 * @addr: the address to check.
3435 * See is_module_text_address() if you simply want to see if the address
3436 * is code (not data).
3438 bool is_module_address(unsigned long addr
)
3443 ret
= __module_address(addr
) != NULL
;
3450 * __module_address - get the module which contains an address.
3451 * @addr: the address.
3453 * Must be called with preempt disabled or module mutex held so that
3454 * module doesn't get freed during this.
3456 struct module
*__module_address(unsigned long addr
)
3460 if (addr
< module_addr_min
|| addr
> module_addr_max
)
3463 list_for_each_entry_rcu(mod
, &modules
, list
)
3464 if (within_module_core(addr
, mod
)
3465 || within_module_init(addr
, mod
))
3469 EXPORT_SYMBOL_GPL(__module_address
);
3472 * is_module_text_address - is this address inside module code?
3473 * @addr: the address to check.
3475 * See is_module_address() if you simply want to see if the address is
3476 * anywhere in a module. See kernel_text_address() for testing if an
3477 * address corresponds to kernel or module code.
3479 bool is_module_text_address(unsigned long addr
)
3484 ret
= __module_text_address(addr
) != NULL
;
3491 * __module_text_address - get the module whose code contains an address.
3492 * @addr: the address.
3494 * Must be called with preempt disabled or module mutex held so that
3495 * module doesn't get freed during this.
3497 struct module
*__module_text_address(unsigned long addr
)
3499 struct module
*mod
= __module_address(addr
);
3501 /* Make sure it's within the text section. */
3502 if (!within(addr
, mod
->module_init
, mod
->init_text_size
)
3503 && !within(addr
, mod
->module_core
, mod
->core_text_size
))
3508 EXPORT_SYMBOL_GPL(__module_text_address
);
3510 /* Don't grab lock, we're oopsing. */
3511 void print_modules(void)
3516 printk(KERN_DEFAULT
"Modules linked in:");
3517 /* Most callers should already have preempt disabled, but make sure */
3519 list_for_each_entry_rcu(mod
, &modules
, list
)
3520 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
3522 if (last_unloaded_module
[0])
3523 printk(" [last unloaded: %s]", last_unloaded_module
);
3527 #ifdef CONFIG_MODVERSIONS
3528 /* Generate the signature for all relevant module structures here.
3529 * If these change, we don't want to try to parse the module. */
3530 void module_layout(struct module
*mod
,
3531 struct modversion_info
*ver
,
3532 struct kernel_param
*kp
,
3533 struct kernel_symbol
*ks
,
3534 struct tracepoint
* const *tp
)
3537 EXPORT_SYMBOL(module_layout
);