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/trace_events.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
24 #include <linux/file.h>
26 #include <linux/sysfs.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/vmalloc.h>
30 #include <linux/elf.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/seq_file.h>
34 #include <linux/syscalls.h>
35 #include <linux/fcntl.h>
36 #include <linux/rcupdate.h>
37 #include <linux/capability.h>
38 #include <linux/cpu.h>
39 #include <linux/moduleparam.h>
40 #include <linux/errno.h>
41 #include <linux/err.h>
42 #include <linux/vermagic.h>
43 #include <linux/notifier.h>
44 #include <linux/sched.h>
45 #include <linux/device.h>
46 #include <linux/string.h>
47 #include <linux/mutex.h>
48 #include <linux/rculist.h>
49 #include <asm/uaccess.h>
50 #include <asm/cacheflush.h>
51 #include <asm/mmu_context.h>
52 #include <linux/license.h>
53 #include <asm/sections.h>
54 #include <linux/tracepoint.h>
55 #include <linux/ftrace.h>
56 #include <linux/async.h>
57 #include <linux/percpu.h>
58 #include <linux/kmemleak.h>
59 #include <linux/jump_label.h>
60 #include <linux/pfn.h>
61 #include <linux/bsearch.h>
62 #include <uapi/linux/module.h>
63 #include "module-internal.h"
65 #define CREATE_TRACE_POINTS
66 #include <trace/events/module.h>
68 #ifndef ARCH_SHF_SMALL
69 #define ARCH_SHF_SMALL 0
73 * Modules' sections will be aligned on page boundaries
74 * to ensure complete separation of code and data, but
75 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
77 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
78 # define debug_align(X) ALIGN(X, PAGE_SIZE)
80 # define debug_align(X) (X)
83 /* If this is set, the section belongs in the init part of the module */
84 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
88 * 1) List of modules (also safely readable with preempt_disable),
89 * 2) module_use links,
90 * 3) module_addr_min/module_addr_max.
91 * (delete and add uses RCU list operations). */
92 DEFINE_MUTEX(module_mutex
);
93 EXPORT_SYMBOL_GPL(module_mutex
);
94 static LIST_HEAD(modules
);
96 #ifdef CONFIG_MODULES_TREE_LOOKUP
99 * Use a latched RB-tree for __module_address(); this allows us to use
100 * RCU-sched lookups of the address from any context.
102 * This is conditional on PERF_EVENTS || TRACING because those can really hit
103 * __module_address() hard by doing a lot of stack unwinding; potentially from
107 static __always_inline
unsigned long __mod_tree_val(struct latch_tree_node
*n
)
109 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
111 return (unsigned long)layout
->base
;
114 static __always_inline
unsigned long __mod_tree_size(struct latch_tree_node
*n
)
116 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
118 return (unsigned long)layout
->size
;
121 static __always_inline
bool
122 mod_tree_less(struct latch_tree_node
*a
, struct latch_tree_node
*b
)
124 return __mod_tree_val(a
) < __mod_tree_val(b
);
127 static __always_inline
int
128 mod_tree_comp(void *key
, struct latch_tree_node
*n
)
130 unsigned long val
= (unsigned long)key
;
131 unsigned long start
, end
;
133 start
= __mod_tree_val(n
);
137 end
= start
+ __mod_tree_size(n
);
144 static const struct latch_tree_ops mod_tree_ops
= {
145 .less
= mod_tree_less
,
146 .comp
= mod_tree_comp
,
149 static struct mod_tree_root
{
150 struct latch_tree_root root
;
151 unsigned long addr_min
;
152 unsigned long addr_max
;
153 } mod_tree __cacheline_aligned
= {
157 #define module_addr_min mod_tree.addr_min
158 #define module_addr_max mod_tree.addr_max
160 static noinline
void __mod_tree_insert(struct mod_tree_node
*node
)
162 latch_tree_insert(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
165 static void __mod_tree_remove(struct mod_tree_node
*node
)
167 latch_tree_erase(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
171 * These modifications: insert, remove_init and remove; are serialized by the
174 static void mod_tree_insert(struct module
*mod
)
176 mod
->core_layout
.mtn
.mod
= mod
;
177 mod
->init_layout
.mtn
.mod
= mod
;
179 __mod_tree_insert(&mod
->core_layout
.mtn
);
180 if (mod
->init_layout
.size
)
181 __mod_tree_insert(&mod
->init_layout
.mtn
);
184 static void mod_tree_remove_init(struct module
*mod
)
186 if (mod
->init_layout
.size
)
187 __mod_tree_remove(&mod
->init_layout
.mtn
);
190 static void mod_tree_remove(struct module
*mod
)
192 __mod_tree_remove(&mod
->core_layout
.mtn
);
193 mod_tree_remove_init(mod
);
196 static struct module
*mod_find(unsigned long addr
)
198 struct latch_tree_node
*ltn
;
200 ltn
= latch_tree_find((void *)addr
, &mod_tree
.root
, &mod_tree_ops
);
204 return container_of(ltn
, struct mod_tree_node
, node
)->mod
;
207 #else /* MODULES_TREE_LOOKUP */
209 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
211 static void mod_tree_insert(struct module
*mod
) { }
212 static void mod_tree_remove_init(struct module
*mod
) { }
213 static void mod_tree_remove(struct module
*mod
) { }
215 static struct module
*mod_find(unsigned long addr
)
219 list_for_each_entry_rcu(mod
, &modules
, list
) {
220 if (within_module(addr
, mod
))
227 #endif /* MODULES_TREE_LOOKUP */
230 * Bounds of module text, for speeding up __module_address.
231 * Protected by module_mutex.
233 static void __mod_update_bounds(void *base
, unsigned int size
)
235 unsigned long min
= (unsigned long)base
;
236 unsigned long max
= min
+ size
;
238 if (min
< module_addr_min
)
239 module_addr_min
= min
;
240 if (max
> module_addr_max
)
241 module_addr_max
= max
;
244 static void mod_update_bounds(struct module
*mod
)
246 __mod_update_bounds(mod
->core_layout
.base
, mod
->core_layout
.size
);
247 if (mod
->init_layout
.size
)
248 __mod_update_bounds(mod
->init_layout
.base
, mod
->init_layout
.size
);
251 #ifdef CONFIG_KGDB_KDB
252 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
253 #endif /* CONFIG_KGDB_KDB */
255 static void module_assert_mutex(void)
257 lockdep_assert_held(&module_mutex
);
260 static void module_assert_mutex_or_preempt(void)
262 #ifdef CONFIG_LOCKDEP
263 if (unlikely(!debug_locks
))
266 WARN_ON(!rcu_read_lock_sched_held() &&
267 !lockdep_is_held(&module_mutex
));
271 static bool sig_enforce
= IS_ENABLED(CONFIG_MODULE_SIG_FORCE
);
272 #ifndef CONFIG_MODULE_SIG_FORCE
273 module_param(sig_enforce
, bool_enable_only
, 0644);
274 #endif /* !CONFIG_MODULE_SIG_FORCE */
276 /* Block module loading/unloading? */
277 int modules_disabled
= 0;
278 core_param(nomodule
, modules_disabled
, bint
, 0);
280 /* Waiting for a module to finish initializing? */
281 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
283 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
285 int register_module_notifier(struct notifier_block
*nb
)
287 return blocking_notifier_chain_register(&module_notify_list
, nb
);
289 EXPORT_SYMBOL(register_module_notifier
);
291 int unregister_module_notifier(struct notifier_block
*nb
)
293 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
295 EXPORT_SYMBOL(unregister_module_notifier
);
301 char *secstrings
, *strtab
;
302 unsigned long symoffs
, stroffs
;
303 struct _ddebug
*debug
;
304 unsigned int num_debug
;
306 #ifdef CONFIG_KALLSYMS
307 unsigned long mod_kallsyms_init_off
;
310 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
314 /* We require a truly strong try_module_get(): 0 means failure due to
315 ongoing or failed initialization etc. */
316 static inline int strong_try_module_get(struct module
*mod
)
318 BUG_ON(mod
&& mod
->state
== MODULE_STATE_UNFORMED
);
319 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
321 if (try_module_get(mod
))
327 static inline void add_taint_module(struct module
*mod
, unsigned flag
,
328 enum lockdep_ok lockdep_ok
)
330 add_taint(flag
, lockdep_ok
);
331 mod
->taints
|= (1U << flag
);
335 * A thread that wants to hold a reference to a module only while it
336 * is running can call this to safely exit. nfsd and lockd use this.
338 void __module_put_and_exit(struct module
*mod
, long code
)
343 EXPORT_SYMBOL(__module_put_and_exit
);
345 /* Find a module section: 0 means not found. */
346 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
350 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
351 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
352 /* Alloc bit cleared means "ignore it." */
353 if ((shdr
->sh_flags
& SHF_ALLOC
)
354 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
360 /* Find a module section, or NULL. */
361 static void *section_addr(const struct load_info
*info
, const char *name
)
363 /* Section 0 has sh_addr 0. */
364 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
367 /* Find a module section, or NULL. Fill in number of "objects" in section. */
368 static void *section_objs(const struct load_info
*info
,
373 unsigned int sec
= find_sec(info
, name
);
375 /* Section 0 has sh_addr 0 and sh_size 0. */
376 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
377 return (void *)info
->sechdrs
[sec
].sh_addr
;
380 /* Provided by the linker */
381 extern const struct kernel_symbol __start___ksymtab
[];
382 extern const struct kernel_symbol __stop___ksymtab
[];
383 extern const struct kernel_symbol __start___ksymtab_gpl
[];
384 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
385 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
386 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
387 extern const unsigned long __start___kcrctab
[];
388 extern const unsigned long __start___kcrctab_gpl
[];
389 extern const unsigned long __start___kcrctab_gpl_future
[];
390 #ifdef CONFIG_UNUSED_SYMBOLS
391 extern const struct kernel_symbol __start___ksymtab_unused
[];
392 extern const struct kernel_symbol __stop___ksymtab_unused
[];
393 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
394 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
395 extern const unsigned long __start___kcrctab_unused
[];
396 extern const unsigned long __start___kcrctab_unused_gpl
[];
399 #ifndef CONFIG_MODVERSIONS
400 #define symversion(base, idx) NULL
402 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
405 static bool each_symbol_in_section(const struct symsearch
*arr
,
406 unsigned int arrsize
,
407 struct module
*owner
,
408 bool (*fn
)(const struct symsearch
*syms
,
409 struct module
*owner
,
415 for (j
= 0; j
< arrsize
; j
++) {
416 if (fn(&arr
[j
], owner
, data
))
423 /* Returns true as soon as fn returns true, otherwise false. */
424 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
425 struct module
*owner
,
430 static const struct symsearch arr
[] = {
431 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
432 NOT_GPL_ONLY
, false },
433 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
434 __start___kcrctab_gpl
,
436 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
437 __start___kcrctab_gpl_future
,
438 WILL_BE_GPL_ONLY
, false },
439 #ifdef CONFIG_UNUSED_SYMBOLS
440 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
441 __start___kcrctab_unused
,
442 NOT_GPL_ONLY
, true },
443 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
444 __start___kcrctab_unused_gpl
,
449 module_assert_mutex_or_preempt();
451 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
454 list_for_each_entry_rcu(mod
, &modules
, list
) {
455 struct symsearch arr
[] = {
456 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
457 NOT_GPL_ONLY
, false },
458 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
461 { mod
->gpl_future_syms
,
462 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
463 mod
->gpl_future_crcs
,
464 WILL_BE_GPL_ONLY
, false },
465 #ifdef CONFIG_UNUSED_SYMBOLS
467 mod
->unused_syms
+ mod
->num_unused_syms
,
469 NOT_GPL_ONLY
, true },
470 { mod
->unused_gpl_syms
,
471 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
472 mod
->unused_gpl_crcs
,
477 if (mod
->state
== MODULE_STATE_UNFORMED
)
480 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
485 EXPORT_SYMBOL_GPL(each_symbol_section
);
487 struct find_symbol_arg
{
494 struct module
*owner
;
495 const unsigned long *crc
;
496 const struct kernel_symbol
*sym
;
499 static bool check_symbol(const struct symsearch
*syms
,
500 struct module
*owner
,
501 unsigned int symnum
, void *data
)
503 struct find_symbol_arg
*fsa
= data
;
506 if (syms
->licence
== GPL_ONLY
)
508 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
509 pr_warn("Symbol %s is being used by a non-GPL module, "
510 "which will not be allowed in the future\n",
515 #ifdef CONFIG_UNUSED_SYMBOLS
516 if (syms
->unused
&& fsa
->warn
) {
517 pr_warn("Symbol %s is marked as UNUSED, however this module is "
518 "using it.\n", fsa
->name
);
519 pr_warn("This symbol will go away in the future.\n");
520 pr_warn("Please evaluate if this is the right api to use and "
521 "if it really is, submit a report to the linux kernel "
522 "mailing list together with submitting your code for "
528 fsa
->crc
= symversion(syms
->crcs
, symnum
);
529 fsa
->sym
= &syms
->start
[symnum
];
533 static int cmp_name(const void *va
, const void *vb
)
536 const struct kernel_symbol
*b
;
538 return strcmp(a
, b
->name
);
541 static bool find_symbol_in_section(const struct symsearch
*syms
,
542 struct module
*owner
,
545 struct find_symbol_arg
*fsa
= data
;
546 struct kernel_symbol
*sym
;
548 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
549 sizeof(struct kernel_symbol
), cmp_name
);
551 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
557 /* Find a symbol and return it, along with, (optional) crc and
558 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
559 const struct kernel_symbol
*find_symbol(const char *name
,
560 struct module
**owner
,
561 const unsigned long **crc
,
565 struct find_symbol_arg fsa
;
571 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
579 pr_debug("Failed to find symbol %s\n", name
);
582 EXPORT_SYMBOL_GPL(find_symbol
);
585 * Search for module by name: must hold module_mutex (or preempt disabled
586 * for read-only access).
588 static struct module
*find_module_all(const char *name
, size_t len
,
593 module_assert_mutex_or_preempt();
595 list_for_each_entry(mod
, &modules
, list
) {
596 if (!even_unformed
&& mod
->state
== MODULE_STATE_UNFORMED
)
598 if (strlen(mod
->name
) == len
&& !memcmp(mod
->name
, name
, len
))
604 struct module
*find_module(const char *name
)
606 module_assert_mutex();
607 return find_module_all(name
, strlen(name
), false);
609 EXPORT_SYMBOL_GPL(find_module
);
613 static inline void __percpu
*mod_percpu(struct module
*mod
)
618 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
620 Elf_Shdr
*pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
621 unsigned long align
= pcpusec
->sh_addralign
;
623 if (!pcpusec
->sh_size
)
626 if (align
> PAGE_SIZE
) {
627 pr_warn("%s: per-cpu alignment %li > %li\n",
628 mod
->name
, align
, PAGE_SIZE
);
632 mod
->percpu
= __alloc_reserved_percpu(pcpusec
->sh_size
, align
);
634 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
635 mod
->name
, (unsigned long)pcpusec
->sh_size
);
638 mod
->percpu_size
= pcpusec
->sh_size
;
642 static void percpu_modfree(struct module
*mod
)
644 free_percpu(mod
->percpu
);
647 static unsigned int find_pcpusec(struct load_info
*info
)
649 return find_sec(info
, ".data..percpu");
652 static void percpu_modcopy(struct module
*mod
,
653 const void *from
, unsigned long size
)
657 for_each_possible_cpu(cpu
)
658 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
662 * is_module_percpu_address - test whether address is from module static percpu
663 * @addr: address to test
665 * Test whether @addr belongs to module static percpu area.
668 * %true if @addr is from module static percpu area
670 bool is_module_percpu_address(unsigned long addr
)
677 list_for_each_entry_rcu(mod
, &modules
, list
) {
678 if (mod
->state
== MODULE_STATE_UNFORMED
)
680 if (!mod
->percpu_size
)
682 for_each_possible_cpu(cpu
) {
683 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
685 if ((void *)addr
>= start
&&
686 (void *)addr
< start
+ mod
->percpu_size
) {
697 #else /* ... !CONFIG_SMP */
699 static inline void __percpu
*mod_percpu(struct module
*mod
)
703 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
705 /* UP modules shouldn't have this section: ENOMEM isn't quite right */
706 if (info
->sechdrs
[info
->index
.pcpu
].sh_size
!= 0)
710 static inline void percpu_modfree(struct module
*mod
)
713 static unsigned int find_pcpusec(struct load_info
*info
)
717 static inline void percpu_modcopy(struct module
*mod
,
718 const void *from
, unsigned long size
)
720 /* pcpusec should be 0, and size of that section should be 0. */
723 bool is_module_percpu_address(unsigned long addr
)
728 #endif /* CONFIG_SMP */
730 #define MODINFO_ATTR(field) \
731 static void setup_modinfo_##field(struct module *mod, const char *s) \
733 mod->field = kstrdup(s, GFP_KERNEL); \
735 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
736 struct module_kobject *mk, char *buffer) \
738 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
740 static int modinfo_##field##_exists(struct module *mod) \
742 return mod->field != NULL; \
744 static void free_modinfo_##field(struct module *mod) \
749 static struct module_attribute modinfo_##field = { \
750 .attr = { .name = __stringify(field), .mode = 0444 }, \
751 .show = show_modinfo_##field, \
752 .setup = setup_modinfo_##field, \
753 .test = modinfo_##field##_exists, \
754 .free = free_modinfo_##field, \
757 MODINFO_ATTR(version
);
758 MODINFO_ATTR(srcversion
);
760 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
762 #ifdef CONFIG_MODULE_UNLOAD
764 EXPORT_TRACEPOINT_SYMBOL(module_get
);
766 /* MODULE_REF_BASE is the base reference count by kmodule loader. */
767 #define MODULE_REF_BASE 1
769 /* Init the unload section of the module. */
770 static int module_unload_init(struct module
*mod
)
773 * Initialize reference counter to MODULE_REF_BASE.
774 * refcnt == 0 means module is going.
776 atomic_set(&mod
->refcnt
, MODULE_REF_BASE
);
778 INIT_LIST_HEAD(&mod
->source_list
);
779 INIT_LIST_HEAD(&mod
->target_list
);
781 /* Hold reference count during initialization. */
782 atomic_inc(&mod
->refcnt
);
787 /* Does a already use b? */
788 static int already_uses(struct module
*a
, struct module
*b
)
790 struct module_use
*use
;
792 list_for_each_entry(use
, &b
->source_list
, source_list
) {
793 if (use
->source
== a
) {
794 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
798 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
804 * - we add 'a' as a "source", 'b' as a "target" of module use
805 * - the module_use is added to the list of 'b' sources (so
806 * 'b' can walk the list to see who sourced them), and of 'a'
807 * targets (so 'a' can see what modules it targets).
809 static int add_module_usage(struct module
*a
, struct module
*b
)
811 struct module_use
*use
;
813 pr_debug("Allocating new usage for %s.\n", a
->name
);
814 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
816 pr_warn("%s: out of memory loading\n", a
->name
);
822 list_add(&use
->source_list
, &b
->source_list
);
823 list_add(&use
->target_list
, &a
->target_list
);
827 /* Module a uses b: caller needs module_mutex() */
828 int ref_module(struct module
*a
, struct module
*b
)
832 if (b
== NULL
|| already_uses(a
, b
))
835 /* If module isn't available, we fail. */
836 err
= strong_try_module_get(b
);
840 err
= add_module_usage(a
, b
);
847 EXPORT_SYMBOL_GPL(ref_module
);
849 /* Clear the unload stuff of the module. */
850 static void module_unload_free(struct module
*mod
)
852 struct module_use
*use
, *tmp
;
854 mutex_lock(&module_mutex
);
855 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
856 struct module
*i
= use
->target
;
857 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
859 list_del(&use
->source_list
);
860 list_del(&use
->target_list
);
863 mutex_unlock(&module_mutex
);
866 #ifdef CONFIG_MODULE_FORCE_UNLOAD
867 static inline int try_force_unload(unsigned int flags
)
869 int ret
= (flags
& O_TRUNC
);
871 add_taint(TAINT_FORCED_RMMOD
, LOCKDEP_NOW_UNRELIABLE
);
875 static inline int try_force_unload(unsigned int flags
)
879 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
881 /* Try to release refcount of module, 0 means success. */
882 static int try_release_module_ref(struct module
*mod
)
886 /* Try to decrement refcnt which we set at loading */
887 ret
= atomic_sub_return(MODULE_REF_BASE
, &mod
->refcnt
);
890 /* Someone can put this right now, recover with checking */
891 ret
= atomic_add_unless(&mod
->refcnt
, MODULE_REF_BASE
, 0);
896 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
898 /* If it's not unused, quit unless we're forcing. */
899 if (try_release_module_ref(mod
) != 0) {
900 *forced
= try_force_unload(flags
);
905 /* Mark it as dying. */
906 mod
->state
= MODULE_STATE_GOING
;
912 * module_refcount - return the refcount or -1 if unloading
914 * @mod: the module we're checking
917 * -1 if the module is in the process of unloading
918 * otherwise the number of references in the kernel to the module
920 int module_refcount(struct module
*mod
)
922 return atomic_read(&mod
->refcnt
) - MODULE_REF_BASE
;
924 EXPORT_SYMBOL(module_refcount
);
926 /* This exists whether we can unload or not */
927 static void free_module(struct module
*mod
);
929 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
933 char name
[MODULE_NAME_LEN
];
936 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
939 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
941 name
[MODULE_NAME_LEN
-1] = '\0';
943 if (mutex_lock_interruptible(&module_mutex
) != 0)
946 mod
= find_module(name
);
952 if (!list_empty(&mod
->source_list
)) {
953 /* Other modules depend on us: get rid of them first. */
958 /* Doing init or already dying? */
959 if (mod
->state
!= MODULE_STATE_LIVE
) {
960 /* FIXME: if (force), slam module count damn the torpedoes */
961 pr_debug("%s already dying\n", mod
->name
);
966 /* If it has an init func, it must have an exit func to unload */
967 if (mod
->init
&& !mod
->exit
) {
968 forced
= try_force_unload(flags
);
970 /* This module can't be removed */
976 /* Stop the machine so refcounts can't move and disable module. */
977 ret
= try_stop_module(mod
, flags
, &forced
);
981 mutex_unlock(&module_mutex
);
982 /* Final destruction now no one is using it. */
983 if (mod
->exit
!= NULL
)
985 blocking_notifier_call_chain(&module_notify_list
,
986 MODULE_STATE_GOING
, mod
);
987 ftrace_release_mod(mod
);
989 async_synchronize_full();
991 /* Store the name of the last unloaded module for diagnostic purposes */
992 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
997 mutex_unlock(&module_mutex
);
1001 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1003 struct module_use
*use
;
1004 int printed_something
= 0;
1006 seq_printf(m
, " %i ", module_refcount(mod
));
1009 * Always include a trailing , so userspace can differentiate
1010 * between this and the old multi-field proc format.
1012 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
1013 printed_something
= 1;
1014 seq_printf(m
, "%s,", use
->source
->name
);
1017 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
1018 printed_something
= 1;
1019 seq_puts(m
, "[permanent],");
1022 if (!printed_something
)
1026 void __symbol_put(const char *symbol
)
1028 struct module
*owner
;
1031 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
1036 EXPORT_SYMBOL(__symbol_put
);
1038 /* Note this assumes addr is a function, which it currently always is. */
1039 void symbol_put_addr(void *addr
)
1041 struct module
*modaddr
;
1042 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
1044 if (core_kernel_text(a
))
1048 * Even though we hold a reference on the module; we still need to
1049 * disable preemption in order to safely traverse the data structure.
1052 modaddr
= __module_text_address(a
);
1054 module_put(modaddr
);
1057 EXPORT_SYMBOL_GPL(symbol_put_addr
);
1059 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
1060 struct module_kobject
*mk
, char *buffer
)
1062 return sprintf(buffer
, "%i\n", module_refcount(mk
->mod
));
1065 static struct module_attribute modinfo_refcnt
=
1066 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
1068 void __module_get(struct module
*module
)
1072 atomic_inc(&module
->refcnt
);
1073 trace_module_get(module
, _RET_IP_
);
1077 EXPORT_SYMBOL(__module_get
);
1079 bool try_module_get(struct module
*module
)
1085 /* Note: here, we can fail to get a reference */
1086 if (likely(module_is_live(module
) &&
1087 atomic_inc_not_zero(&module
->refcnt
) != 0))
1088 trace_module_get(module
, _RET_IP_
);
1096 EXPORT_SYMBOL(try_module_get
);
1098 void module_put(struct module
*module
)
1104 ret
= atomic_dec_if_positive(&module
->refcnt
);
1105 WARN_ON(ret
< 0); /* Failed to put refcount */
1106 trace_module_put(module
, _RET_IP_
);
1110 EXPORT_SYMBOL(module_put
);
1112 #else /* !CONFIG_MODULE_UNLOAD */
1113 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1115 /* We don't know the usage count, or what modules are using. */
1116 seq_puts(m
, " - -");
1119 static inline void module_unload_free(struct module
*mod
)
1123 int ref_module(struct module
*a
, struct module
*b
)
1125 return strong_try_module_get(b
);
1127 EXPORT_SYMBOL_GPL(ref_module
);
1129 static inline int module_unload_init(struct module
*mod
)
1133 #endif /* CONFIG_MODULE_UNLOAD */
1135 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1139 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1141 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1143 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1145 if (mod
->taints
& (1 << TAINT_CRAP
))
1147 if (mod
->taints
& (1 << TAINT_UNSIGNED_MODULE
))
1150 * TAINT_FORCED_RMMOD: could be added.
1151 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1157 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1158 struct module_kobject
*mk
, char *buffer
)
1160 const char *state
= "unknown";
1162 switch (mk
->mod
->state
) {
1163 case MODULE_STATE_LIVE
:
1166 case MODULE_STATE_COMING
:
1169 case MODULE_STATE_GOING
:
1175 return sprintf(buffer
, "%s\n", state
);
1178 static struct module_attribute modinfo_initstate
=
1179 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1181 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1182 struct module_kobject
*mk
,
1183 const char *buffer
, size_t count
)
1185 enum kobject_action action
;
1187 if (kobject_action_type(buffer
, count
, &action
) == 0)
1188 kobject_uevent(&mk
->kobj
, action
);
1192 struct module_attribute module_uevent
=
1193 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1195 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1196 struct module_kobject
*mk
, char *buffer
)
1198 return sprintf(buffer
, "%u\n", mk
->mod
->core_layout
.size
);
1201 static struct module_attribute modinfo_coresize
=
1202 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1204 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1205 struct module_kobject
*mk
, char *buffer
)
1207 return sprintf(buffer
, "%u\n", mk
->mod
->init_layout
.size
);
1210 static struct module_attribute modinfo_initsize
=
1211 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1213 static ssize_t
show_taint(struct module_attribute
*mattr
,
1214 struct module_kobject
*mk
, char *buffer
)
1218 l
= module_flags_taint(mk
->mod
, buffer
);
1223 static struct module_attribute modinfo_taint
=
1224 __ATTR(taint
, 0444, show_taint
, NULL
);
1226 static struct module_attribute
*modinfo_attrs
[] = {
1229 &modinfo_srcversion
,
1234 #ifdef CONFIG_MODULE_UNLOAD
1240 static const char vermagic
[] = VERMAGIC_STRING
;
1242 static int try_to_force_load(struct module
*mod
, const char *reason
)
1244 #ifdef CONFIG_MODULE_FORCE_LOAD
1245 if (!test_taint(TAINT_FORCED_MODULE
))
1246 pr_warn("%s: %s: kernel tainted.\n", mod
->name
, reason
);
1247 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
1254 #ifdef CONFIG_MODVERSIONS
1255 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1256 static unsigned long maybe_relocated(unsigned long crc
,
1257 const struct module
*crc_owner
)
1259 #ifdef ARCH_RELOCATES_KCRCTAB
1260 if (crc_owner
== NULL
)
1261 return crc
- (unsigned long)reloc_start
;
1266 static int check_version(Elf_Shdr
*sechdrs
,
1267 unsigned int versindex
,
1268 const char *symname
,
1270 const unsigned long *crc
,
1271 const struct module
*crc_owner
)
1273 unsigned int i
, num_versions
;
1274 struct modversion_info
*versions
;
1276 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1280 /* No versions at all? modprobe --force does this. */
1282 return try_to_force_load(mod
, symname
) == 0;
1284 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1285 num_versions
= sechdrs
[versindex
].sh_size
1286 / sizeof(struct modversion_info
);
1288 for (i
= 0; i
< num_versions
; i
++) {
1289 if (strcmp(versions
[i
].name
, symname
) != 0)
1292 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1294 pr_debug("Found checksum %lX vs module %lX\n",
1295 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1299 pr_warn("%s: no symbol version for %s\n", mod
->name
, symname
);
1303 pr_warn("%s: disagrees about version of symbol %s\n",
1304 mod
->name
, symname
);
1308 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1309 unsigned int versindex
,
1312 const unsigned long *crc
;
1315 * Since this should be found in kernel (which can't be removed), no
1316 * locking is necessary -- use preempt_disable() to placate lockdep.
1319 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout
), NULL
,
1320 &crc
, true, false)) {
1325 return check_version(sechdrs
, versindex
,
1326 VMLINUX_SYMBOL_STR(module_layout
), mod
, crc
,
1330 /* First part is kernel version, which we ignore if module has crcs. */
1331 static inline int same_magic(const char *amagic
, const char *bmagic
,
1335 amagic
+= strcspn(amagic
, " ");
1336 bmagic
+= strcspn(bmagic
, " ");
1338 return strcmp(amagic
, bmagic
) == 0;
1341 static inline int check_version(Elf_Shdr
*sechdrs
,
1342 unsigned int versindex
,
1343 const char *symname
,
1345 const unsigned long *crc
,
1346 const struct module
*crc_owner
)
1351 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1352 unsigned int versindex
,
1358 static inline int same_magic(const char *amagic
, const char *bmagic
,
1361 return strcmp(amagic
, bmagic
) == 0;
1363 #endif /* CONFIG_MODVERSIONS */
1365 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1366 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1367 const struct load_info
*info
,
1371 struct module
*owner
;
1372 const struct kernel_symbol
*sym
;
1373 const unsigned long *crc
;
1377 * The module_mutex should not be a heavily contended lock;
1378 * if we get the occasional sleep here, we'll go an extra iteration
1379 * in the wait_event_interruptible(), which is harmless.
1381 sched_annotate_sleep();
1382 mutex_lock(&module_mutex
);
1383 sym
= find_symbol(name
, &owner
, &crc
,
1384 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1388 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1390 sym
= ERR_PTR(-EINVAL
);
1394 err
= ref_module(mod
, owner
);
1401 /* We must make copy under the lock if we failed to get ref. */
1402 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1404 mutex_unlock(&module_mutex
);
1408 static const struct kernel_symbol
*
1409 resolve_symbol_wait(struct module
*mod
,
1410 const struct load_info
*info
,
1413 const struct kernel_symbol
*ksym
;
1414 char owner
[MODULE_NAME_LEN
];
1416 if (wait_event_interruptible_timeout(module_wq
,
1417 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1418 || PTR_ERR(ksym
) != -EBUSY
,
1420 pr_warn("%s: gave up waiting for init of module %s.\n",
1427 * /sys/module/foo/sections stuff
1428 * J. Corbet <corbet@lwn.net>
1432 #ifdef CONFIG_KALLSYMS
1433 static inline bool sect_empty(const Elf_Shdr
*sect
)
1435 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1438 struct module_sect_attr
{
1439 struct module_attribute mattr
;
1441 unsigned long address
;
1444 struct module_sect_attrs
{
1445 struct attribute_group grp
;
1446 unsigned int nsections
;
1447 struct module_sect_attr attrs
[0];
1450 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1451 struct module_kobject
*mk
, char *buf
)
1453 struct module_sect_attr
*sattr
=
1454 container_of(mattr
, struct module_sect_attr
, mattr
);
1455 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1458 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1460 unsigned int section
;
1462 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1463 kfree(sect_attrs
->attrs
[section
].name
);
1467 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1469 unsigned int nloaded
= 0, i
, size
[2];
1470 struct module_sect_attrs
*sect_attrs
;
1471 struct module_sect_attr
*sattr
;
1472 struct attribute
**gattr
;
1474 /* Count loaded sections and allocate structures */
1475 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1476 if (!sect_empty(&info
->sechdrs
[i
]))
1478 size
[0] = ALIGN(sizeof(*sect_attrs
)
1479 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1480 sizeof(sect_attrs
->grp
.attrs
[0]));
1481 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1482 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1483 if (sect_attrs
== NULL
)
1486 /* Setup section attributes. */
1487 sect_attrs
->grp
.name
= "sections";
1488 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1490 sect_attrs
->nsections
= 0;
1491 sattr
= §_attrs
->attrs
[0];
1492 gattr
= §_attrs
->grp
.attrs
[0];
1493 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1494 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1495 if (sect_empty(sec
))
1497 sattr
->address
= sec
->sh_addr
;
1498 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1500 if (sattr
->name
== NULL
)
1502 sect_attrs
->nsections
++;
1503 sysfs_attr_init(&sattr
->mattr
.attr
);
1504 sattr
->mattr
.show
= module_sect_show
;
1505 sattr
->mattr
.store
= NULL
;
1506 sattr
->mattr
.attr
.name
= sattr
->name
;
1507 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1508 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1512 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1515 mod
->sect_attrs
= sect_attrs
;
1518 free_sect_attrs(sect_attrs
);
1521 static void remove_sect_attrs(struct module
*mod
)
1523 if (mod
->sect_attrs
) {
1524 sysfs_remove_group(&mod
->mkobj
.kobj
,
1525 &mod
->sect_attrs
->grp
);
1526 /* We are positive that no one is using any sect attrs
1527 * at this point. Deallocate immediately. */
1528 free_sect_attrs(mod
->sect_attrs
);
1529 mod
->sect_attrs
= NULL
;
1534 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1537 struct module_notes_attrs
{
1538 struct kobject
*dir
;
1540 struct bin_attribute attrs
[0];
1543 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1544 struct bin_attribute
*bin_attr
,
1545 char *buf
, loff_t pos
, size_t count
)
1548 * The caller checked the pos and count against our size.
1550 memcpy(buf
, bin_attr
->private + pos
, count
);
1554 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1557 if (notes_attrs
->dir
) {
1559 sysfs_remove_bin_file(notes_attrs
->dir
,
1560 ¬es_attrs
->attrs
[i
]);
1561 kobject_put(notes_attrs
->dir
);
1566 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1568 unsigned int notes
, loaded
, i
;
1569 struct module_notes_attrs
*notes_attrs
;
1570 struct bin_attribute
*nattr
;
1572 /* failed to create section attributes, so can't create notes */
1573 if (!mod
->sect_attrs
)
1576 /* Count notes sections and allocate structures. */
1578 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1579 if (!sect_empty(&info
->sechdrs
[i
]) &&
1580 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1586 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1587 + notes
* sizeof(notes_attrs
->attrs
[0]),
1589 if (notes_attrs
== NULL
)
1592 notes_attrs
->notes
= notes
;
1593 nattr
= ¬es_attrs
->attrs
[0];
1594 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1595 if (sect_empty(&info
->sechdrs
[i
]))
1597 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1598 sysfs_bin_attr_init(nattr
);
1599 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1600 nattr
->attr
.mode
= S_IRUGO
;
1601 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1602 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1603 nattr
->read
= module_notes_read
;
1609 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1610 if (!notes_attrs
->dir
)
1613 for (i
= 0; i
< notes
; ++i
)
1614 if (sysfs_create_bin_file(notes_attrs
->dir
,
1615 ¬es_attrs
->attrs
[i
]))
1618 mod
->notes_attrs
= notes_attrs
;
1622 free_notes_attrs(notes_attrs
, i
);
1625 static void remove_notes_attrs(struct module
*mod
)
1627 if (mod
->notes_attrs
)
1628 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1633 static inline void add_sect_attrs(struct module
*mod
,
1634 const struct load_info
*info
)
1638 static inline void remove_sect_attrs(struct module
*mod
)
1642 static inline void add_notes_attrs(struct module
*mod
,
1643 const struct load_info
*info
)
1647 static inline void remove_notes_attrs(struct module
*mod
)
1650 #endif /* CONFIG_KALLSYMS */
1652 static void add_usage_links(struct module
*mod
)
1654 #ifdef CONFIG_MODULE_UNLOAD
1655 struct module_use
*use
;
1658 mutex_lock(&module_mutex
);
1659 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1660 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1661 &mod
->mkobj
.kobj
, mod
->name
);
1663 mutex_unlock(&module_mutex
);
1667 static void del_usage_links(struct module
*mod
)
1669 #ifdef CONFIG_MODULE_UNLOAD
1670 struct module_use
*use
;
1672 mutex_lock(&module_mutex
);
1673 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1674 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1675 mutex_unlock(&module_mutex
);
1679 static int module_add_modinfo_attrs(struct module
*mod
)
1681 struct module_attribute
*attr
;
1682 struct module_attribute
*temp_attr
;
1686 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1687 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1689 if (!mod
->modinfo_attrs
)
1692 temp_attr
= mod
->modinfo_attrs
;
1693 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1695 (attr
->test
&& attr
->test(mod
))) {
1696 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1697 sysfs_attr_init(&temp_attr
->attr
);
1698 error
= sysfs_create_file(&mod
->mkobj
.kobj
,
1706 static void module_remove_modinfo_attrs(struct module
*mod
)
1708 struct module_attribute
*attr
;
1711 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1712 /* pick a field to test for end of list */
1713 if (!attr
->attr
.name
)
1715 sysfs_remove_file(&mod
->mkobj
.kobj
, &attr
->attr
);
1719 kfree(mod
->modinfo_attrs
);
1722 static void mod_kobject_put(struct module
*mod
)
1724 DECLARE_COMPLETION_ONSTACK(c
);
1725 mod
->mkobj
.kobj_completion
= &c
;
1726 kobject_put(&mod
->mkobj
.kobj
);
1727 wait_for_completion(&c
);
1730 static int mod_sysfs_init(struct module
*mod
)
1733 struct kobject
*kobj
;
1735 if (!module_sysfs_initialized
) {
1736 pr_err("%s: module sysfs not initialized\n", mod
->name
);
1741 kobj
= kset_find_obj(module_kset
, mod
->name
);
1743 pr_err("%s: module is already loaded\n", mod
->name
);
1749 mod
->mkobj
.mod
= mod
;
1751 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1752 mod
->mkobj
.kobj
.kset
= module_kset
;
1753 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1756 mod_kobject_put(mod
);
1758 /* delay uevent until full sysfs population */
1763 static int mod_sysfs_setup(struct module
*mod
,
1764 const struct load_info
*info
,
1765 struct kernel_param
*kparam
,
1766 unsigned int num_params
)
1770 err
= mod_sysfs_init(mod
);
1774 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1775 if (!mod
->holders_dir
) {
1780 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1782 goto out_unreg_holders
;
1784 err
= module_add_modinfo_attrs(mod
);
1786 goto out_unreg_param
;
1788 add_usage_links(mod
);
1789 add_sect_attrs(mod
, info
);
1790 add_notes_attrs(mod
, info
);
1792 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1796 module_param_sysfs_remove(mod
);
1798 kobject_put(mod
->holders_dir
);
1800 mod_kobject_put(mod
);
1805 static void mod_sysfs_fini(struct module
*mod
)
1807 remove_notes_attrs(mod
);
1808 remove_sect_attrs(mod
);
1809 mod_kobject_put(mod
);
1812 static void init_param_lock(struct module
*mod
)
1814 mutex_init(&mod
->param_lock
);
1816 #else /* !CONFIG_SYSFS */
1818 static int mod_sysfs_setup(struct module
*mod
,
1819 const struct load_info
*info
,
1820 struct kernel_param
*kparam
,
1821 unsigned int num_params
)
1826 static void mod_sysfs_fini(struct module
*mod
)
1830 static void module_remove_modinfo_attrs(struct module
*mod
)
1834 static void del_usage_links(struct module
*mod
)
1838 static void init_param_lock(struct module
*mod
)
1841 #endif /* CONFIG_SYSFS */
1843 static void mod_sysfs_teardown(struct module
*mod
)
1845 del_usage_links(mod
);
1846 module_remove_modinfo_attrs(mod
);
1847 module_param_sysfs_remove(mod
);
1848 kobject_put(mod
->mkobj
.drivers_dir
);
1849 kobject_put(mod
->holders_dir
);
1850 mod_sysfs_fini(mod
);
1853 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1855 * LKM RO/NX protection: protect module's text/ro-data
1856 * from modification and any data from execution.
1858 * General layout of module is:
1859 * [text] [read-only-data] [writable data]
1860 * text_size -----^ ^ ^
1861 * ro_size ------------------------| |
1862 * size -------------------------------------------|
1864 * These values are always page-aligned (as is base)
1866 static void frob_text(const struct module_layout
*layout
,
1867 int (*set_memory
)(unsigned long start
, int num_pages
))
1869 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1870 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1871 set_memory((unsigned long)layout
->base
,
1872 layout
->text_size
>> PAGE_SHIFT
);
1875 static void frob_rodata(const struct module_layout
*layout
,
1876 int (*set_memory
)(unsigned long start
, int num_pages
))
1878 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1879 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1880 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1881 set_memory((unsigned long)layout
->base
+ layout
->text_size
,
1882 (layout
->ro_size
- layout
->text_size
) >> PAGE_SHIFT
);
1885 static void frob_writable_data(const struct module_layout
*layout
,
1886 int (*set_memory
)(unsigned long start
, int num_pages
))
1888 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1889 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1890 BUG_ON((unsigned long)layout
->size
& (PAGE_SIZE
-1));
1891 set_memory((unsigned long)layout
->base
+ layout
->ro_size
,
1892 (layout
->size
- layout
->ro_size
) >> PAGE_SHIFT
);
1895 /* livepatching wants to disable read-only so it can frob module. */
1896 void module_disable_ro(const struct module
*mod
)
1898 frob_text(&mod
->core_layout
, set_memory_rw
);
1899 frob_rodata(&mod
->core_layout
, set_memory_rw
);
1900 frob_text(&mod
->init_layout
, set_memory_rw
);
1901 frob_rodata(&mod
->init_layout
, set_memory_rw
);
1904 void module_enable_ro(const struct module
*mod
)
1906 frob_text(&mod
->core_layout
, set_memory_ro
);
1907 frob_rodata(&mod
->core_layout
, set_memory_ro
);
1908 frob_text(&mod
->init_layout
, set_memory_ro
);
1909 frob_rodata(&mod
->init_layout
, set_memory_ro
);
1912 static void module_enable_nx(const struct module
*mod
)
1914 frob_rodata(&mod
->core_layout
, set_memory_nx
);
1915 frob_writable_data(&mod
->core_layout
, set_memory_nx
);
1916 frob_rodata(&mod
->init_layout
, set_memory_nx
);
1917 frob_writable_data(&mod
->init_layout
, set_memory_nx
);
1920 static void module_disable_nx(const struct module
*mod
)
1922 frob_rodata(&mod
->core_layout
, set_memory_x
);
1923 frob_writable_data(&mod
->core_layout
, set_memory_x
);
1924 frob_rodata(&mod
->init_layout
, set_memory_x
);
1925 frob_writable_data(&mod
->init_layout
, set_memory_x
);
1928 /* Iterate through all modules and set each module's text as RW */
1929 void set_all_modules_text_rw(void)
1933 mutex_lock(&module_mutex
);
1934 list_for_each_entry_rcu(mod
, &modules
, list
) {
1935 if (mod
->state
== MODULE_STATE_UNFORMED
)
1938 frob_text(&mod
->core_layout
, set_memory_rw
);
1939 frob_text(&mod
->init_layout
, set_memory_rw
);
1941 mutex_unlock(&module_mutex
);
1944 /* Iterate through all modules and set each module's text as RO */
1945 void set_all_modules_text_ro(void)
1949 mutex_lock(&module_mutex
);
1950 list_for_each_entry_rcu(mod
, &modules
, list
) {
1951 if (mod
->state
== MODULE_STATE_UNFORMED
)
1954 frob_text(&mod
->core_layout
, set_memory_ro
);
1955 frob_text(&mod
->init_layout
, set_memory_ro
);
1957 mutex_unlock(&module_mutex
);
1960 static void disable_ro_nx(const struct module_layout
*layout
)
1962 frob_text(layout
, set_memory_rw
);
1963 frob_rodata(layout
, set_memory_rw
);
1964 frob_rodata(layout
, set_memory_x
);
1965 frob_writable_data(layout
, set_memory_x
);
1969 static void disable_ro_nx(const struct module_layout
*layout
) { }
1970 static void module_enable_nx(const struct module
*mod
) { }
1971 static void module_disable_nx(const struct module
*mod
) { }
1974 void __weak
module_memfree(void *module_region
)
1976 vfree(module_region
);
1979 void __weak
module_arch_cleanup(struct module
*mod
)
1983 void __weak
module_arch_freeing_init(struct module
*mod
)
1987 /* Free a module, remove from lists, etc. */
1988 static void free_module(struct module
*mod
)
1990 trace_module_free(mod
);
1992 mod_sysfs_teardown(mod
);
1994 /* We leave it in list to prevent duplicate loads, but make sure
1995 * that noone uses it while it's being deconstructed. */
1996 mutex_lock(&module_mutex
);
1997 mod
->state
= MODULE_STATE_UNFORMED
;
1998 mutex_unlock(&module_mutex
);
2000 /* Remove dynamic debug info */
2001 ddebug_remove_module(mod
->name
);
2003 /* Arch-specific cleanup. */
2004 module_arch_cleanup(mod
);
2006 /* Module unload stuff */
2007 module_unload_free(mod
);
2009 /* Free any allocated parameters. */
2010 destroy_params(mod
->kp
, mod
->num_kp
);
2012 /* Now we can delete it from the lists */
2013 mutex_lock(&module_mutex
);
2014 /* Unlink carefully: kallsyms could be walking list. */
2015 list_del_rcu(&mod
->list
);
2016 mod_tree_remove(mod
);
2017 /* Remove this module from bug list, this uses list_del_rcu */
2018 module_bug_cleanup(mod
);
2019 /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */
2020 synchronize_sched();
2021 mutex_unlock(&module_mutex
);
2023 /* This may be empty, but that's OK */
2024 disable_ro_nx(&mod
->init_layout
);
2025 module_arch_freeing_init(mod
);
2026 module_memfree(mod
->init_layout
.base
);
2028 percpu_modfree(mod
);
2030 /* Free lock-classes; relies on the preceding sync_rcu(). */
2031 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
2033 /* Finally, free the core (containing the module structure) */
2034 disable_ro_nx(&mod
->core_layout
);
2035 module_memfree(mod
->core_layout
.base
);
2038 update_protections(current
->mm
);
2042 void *__symbol_get(const char *symbol
)
2044 struct module
*owner
;
2045 const struct kernel_symbol
*sym
;
2048 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
2049 if (sym
&& strong_try_module_get(owner
))
2053 return sym
? (void *)sym
->value
: NULL
;
2055 EXPORT_SYMBOL_GPL(__symbol_get
);
2058 * Ensure that an exported symbol [global namespace] does not already exist
2059 * in the kernel or in some other module's exported symbol table.
2061 * You must hold the module_mutex.
2063 static int verify_export_symbols(struct module
*mod
)
2066 struct module
*owner
;
2067 const struct kernel_symbol
*s
;
2069 const struct kernel_symbol
*sym
;
2072 { mod
->syms
, mod
->num_syms
},
2073 { mod
->gpl_syms
, mod
->num_gpl_syms
},
2074 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
2075 #ifdef CONFIG_UNUSED_SYMBOLS
2076 { mod
->unused_syms
, mod
->num_unused_syms
},
2077 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
2081 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
2082 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
2083 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
2084 pr_err("%s: exports duplicate symbol %s"
2086 mod
->name
, s
->name
, module_name(owner
));
2094 /* Change all symbols so that st_value encodes the pointer directly. */
2095 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
2097 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2098 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
2099 unsigned long secbase
;
2102 const struct kernel_symbol
*ksym
;
2104 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
2105 const char *name
= info
->strtab
+ sym
[i
].st_name
;
2107 switch (sym
[i
].st_shndx
) {
2109 /* Ignore common symbols */
2110 if (!strncmp(name
, "__gnu_lto", 9))
2113 /* We compiled with -fno-common. These are not
2114 supposed to happen. */
2115 pr_debug("Common symbol: %s\n", name
);
2116 pr_warn("%s: please compile with -fno-common\n",
2122 /* Don't need to do anything */
2123 pr_debug("Absolute symbol: 0x%08lx\n",
2124 (long)sym
[i
].st_value
);
2128 ksym
= resolve_symbol_wait(mod
, info
, name
);
2129 /* Ok if resolved. */
2130 if (ksym
&& !IS_ERR(ksym
)) {
2131 sym
[i
].st_value
= ksym
->value
;
2136 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
2139 pr_warn("%s: Unknown symbol %s (err %li)\n",
2140 mod
->name
, name
, PTR_ERR(ksym
));
2141 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
2145 /* Divert to percpu allocation if a percpu var. */
2146 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
2147 secbase
= (unsigned long)mod_percpu(mod
);
2149 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
2150 sym
[i
].st_value
+= secbase
;
2158 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
2163 /* Now do relocations. */
2164 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2165 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2167 /* Not a valid relocation section? */
2168 if (infosec
>= info
->hdr
->e_shnum
)
2171 /* Don't bother with non-allocated sections */
2172 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2175 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2176 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2177 info
->index
.sym
, i
, mod
);
2178 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2179 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2180 info
->index
.sym
, i
, mod
);
2187 /* Additional bytes needed by arch in front of individual sections */
2188 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2189 unsigned int section
)
2191 /* default implementation just returns zero */
2195 /* Update size with this section: return offset. */
2196 static long get_offset(struct module
*mod
, unsigned int *size
,
2197 Elf_Shdr
*sechdr
, unsigned int section
)
2201 *size
+= arch_mod_section_prepend(mod
, section
);
2202 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2203 *size
= ret
+ sechdr
->sh_size
;
2207 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2208 might -- code, read-only data, read-write data, small data. Tally
2209 sizes, and place the offsets into sh_entsize fields: high bit means it
2211 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2213 static unsigned long const masks
[][2] = {
2214 /* NOTE: all executable code must be the first section
2215 * in this array; otherwise modify the text_size
2216 * finder in the two loops below */
2217 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2218 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2219 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2220 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2224 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2225 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2227 pr_debug("Core section allocation order:\n");
2228 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2229 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2230 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2231 const char *sname
= info
->secstrings
+ s
->sh_name
;
2233 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2234 || (s
->sh_flags
& masks
[m
][1])
2235 || s
->sh_entsize
!= ~0UL
2236 || strstarts(sname
, ".init"))
2238 s
->sh_entsize
= get_offset(mod
, &mod
->core_layout
.size
, s
, i
);
2239 pr_debug("\t%s\n", sname
);
2242 case 0: /* executable */
2243 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2244 mod
->core_layout
.text_size
= mod
->core_layout
.size
;
2246 case 1: /* RO: text and ro-data */
2247 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2248 mod
->core_layout
.ro_size
= mod
->core_layout
.size
;
2250 case 3: /* whole core */
2251 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2256 pr_debug("Init section allocation order:\n");
2257 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2258 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2259 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2260 const char *sname
= info
->secstrings
+ s
->sh_name
;
2262 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2263 || (s
->sh_flags
& masks
[m
][1])
2264 || s
->sh_entsize
!= ~0UL
2265 || !strstarts(sname
, ".init"))
2267 s
->sh_entsize
= (get_offset(mod
, &mod
->init_layout
.size
, s
, i
)
2268 | INIT_OFFSET_MASK
);
2269 pr_debug("\t%s\n", sname
);
2272 case 0: /* executable */
2273 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2274 mod
->init_layout
.text_size
= mod
->init_layout
.size
;
2276 case 1: /* RO: text and ro-data */
2277 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2278 mod
->init_layout
.ro_size
= mod
->init_layout
.size
;
2280 case 3: /* whole init */
2281 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2287 static void set_license(struct module
*mod
, const char *license
)
2290 license
= "unspecified";
2292 if (!license_is_gpl_compatible(license
)) {
2293 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2294 pr_warn("%s: module license '%s' taints kernel.\n",
2295 mod
->name
, license
);
2296 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2297 LOCKDEP_NOW_UNRELIABLE
);
2301 /* Parse tag=value strings from .modinfo section */
2302 static char *next_string(char *string
, unsigned long *secsize
)
2304 /* Skip non-zero chars */
2307 if ((*secsize
)-- <= 1)
2311 /* Skip any zero padding. */
2312 while (!string
[0]) {
2314 if ((*secsize
)-- <= 1)
2320 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2323 unsigned int taglen
= strlen(tag
);
2324 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2325 unsigned long size
= infosec
->sh_size
;
2327 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2328 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2329 return p
+ taglen
+ 1;
2334 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2336 struct module_attribute
*attr
;
2339 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2341 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2345 static void free_modinfo(struct module
*mod
)
2347 struct module_attribute
*attr
;
2350 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2356 #ifdef CONFIG_KALLSYMS
2358 /* lookup symbol in given range of kernel_symbols */
2359 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2360 const struct kernel_symbol
*start
,
2361 const struct kernel_symbol
*stop
)
2363 return bsearch(name
, start
, stop
- start
,
2364 sizeof(struct kernel_symbol
), cmp_name
);
2367 static int is_exported(const char *name
, unsigned long value
,
2368 const struct module
*mod
)
2370 const struct kernel_symbol
*ks
;
2372 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2374 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2375 return ks
!= NULL
&& ks
->value
== value
;
2379 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2381 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2383 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2384 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2389 if (sym
->st_shndx
== SHN_UNDEF
)
2391 if (sym
->st_shndx
== SHN_ABS
|| sym
->st_shndx
== info
->index
.pcpu
)
2393 if (sym
->st_shndx
>= SHN_LORESERVE
)
2395 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2397 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2398 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2399 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2401 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2406 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2407 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2412 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2419 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2420 unsigned int shnum
, unsigned int pcpundx
)
2422 const Elf_Shdr
*sec
;
2424 if (src
->st_shndx
== SHN_UNDEF
2425 || src
->st_shndx
>= shnum
2429 #ifdef CONFIG_KALLSYMS_ALL
2430 if (src
->st_shndx
== pcpundx
)
2434 sec
= sechdrs
+ src
->st_shndx
;
2435 if (!(sec
->sh_flags
& SHF_ALLOC
)
2436 #ifndef CONFIG_KALLSYMS_ALL
2437 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2439 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2446 * We only allocate and copy the strings needed by the parts of symtab
2447 * we keep. This is simple, but has the effect of making multiple
2448 * copies of duplicates. We could be more sophisticated, see
2449 * linux-kernel thread starting with
2450 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2452 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2454 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2455 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2457 unsigned int i
, nsrc
, ndst
, strtab_size
= 0;
2459 /* Put symbol section at end of init part of module. */
2460 symsect
->sh_flags
|= SHF_ALLOC
;
2461 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, symsect
,
2462 info
->index
.sym
) | INIT_OFFSET_MASK
;
2463 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2465 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2466 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2468 /* Compute total space required for the core symbols' strtab. */
2469 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2471 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2472 info
->index
.pcpu
)) {
2473 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2478 /* Append room for core symbols at end of core part. */
2479 info
->symoffs
= ALIGN(mod
->core_layout
.size
, symsect
->sh_addralign
?: 1);
2480 info
->stroffs
= mod
->core_layout
.size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2481 mod
->core_layout
.size
+= strtab_size
;
2482 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2484 /* Put string table section at end of init part of module. */
2485 strsect
->sh_flags
|= SHF_ALLOC
;
2486 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, strsect
,
2487 info
->index
.str
) | INIT_OFFSET_MASK
;
2488 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2490 /* We'll tack temporary mod_kallsyms on the end. */
2491 mod
->init_layout
.size
= ALIGN(mod
->init_layout
.size
,
2492 __alignof__(struct mod_kallsyms
));
2493 info
->mod_kallsyms_init_off
= mod
->init_layout
.size
;
2494 mod
->init_layout
.size
+= sizeof(struct mod_kallsyms
);
2495 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2499 * We use the full symtab and strtab which layout_symtab arranged to
2500 * be appended to the init section. Later we switch to the cut-down
2503 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2505 unsigned int i
, ndst
;
2509 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2511 /* Set up to point into init section. */
2512 mod
->kallsyms
= mod
->init_layout
.base
+ info
->mod_kallsyms_init_off
;
2514 mod
->kallsyms
->symtab
= (void *)symsec
->sh_addr
;
2515 mod
->kallsyms
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2516 /* Make sure we get permanent strtab: don't use info->strtab. */
2517 mod
->kallsyms
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2519 /* Set types up while we still have access to sections. */
2520 for (i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++)
2521 mod
->kallsyms
->symtab
[i
].st_info
2522 = elf_type(&mod
->kallsyms
->symtab
[i
], info
);
2524 /* Now populate the cut down core kallsyms for after init. */
2525 mod
->core_kallsyms
.symtab
= dst
= mod
->core_layout
.base
+ info
->symoffs
;
2526 mod
->core_kallsyms
.strtab
= s
= mod
->core_layout
.base
+ info
->stroffs
;
2527 src
= mod
->kallsyms
->symtab
;
2528 for (ndst
= i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++) {
2530 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2531 info
->index
.pcpu
)) {
2533 dst
[ndst
++].st_name
= s
- mod
->core_kallsyms
.strtab
;
2534 s
+= strlcpy(s
, &mod
->kallsyms
->strtab
[src
[i
].st_name
],
2538 mod
->core_kallsyms
.num_symtab
= ndst
;
2541 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2545 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2548 #endif /* CONFIG_KALLSYMS */
2550 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2554 #ifdef CONFIG_DYNAMIC_DEBUG
2555 if (ddebug_add_module(debug
, num
, debug
->modname
))
2556 pr_err("dynamic debug error adding module: %s\n",
2561 static void dynamic_debug_remove(struct _ddebug
*debug
)
2564 ddebug_remove_module(debug
->modname
);
2567 void * __weak
module_alloc(unsigned long size
)
2569 return vmalloc_exec(size
);
2572 #ifdef CONFIG_DEBUG_KMEMLEAK
2573 static void kmemleak_load_module(const struct module
*mod
,
2574 const struct load_info
*info
)
2578 /* only scan the sections containing data */
2579 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2581 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2582 /* Scan all writable sections that's not executable */
2583 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
2584 !(info
->sechdrs
[i
].sh_flags
& SHF_WRITE
) ||
2585 (info
->sechdrs
[i
].sh_flags
& SHF_EXECINSTR
))
2588 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2589 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2593 static inline void kmemleak_load_module(const struct module
*mod
,
2594 const struct load_info
*info
)
2599 #ifdef CONFIG_MODULE_SIG
2600 static int module_sig_check(struct load_info
*info
)
2603 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2604 const void *mod
= info
->hdr
;
2606 if (info
->len
> markerlen
&&
2607 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2608 /* We truncate the module to discard the signature */
2609 info
->len
-= markerlen
;
2610 err
= mod_verify_sig(mod
, &info
->len
);
2614 info
->sig_ok
= true;
2618 /* Not having a signature is only an error if we're strict. */
2619 if (err
== -ENOKEY
&& !sig_enforce
)
2624 #else /* !CONFIG_MODULE_SIG */
2625 static int module_sig_check(struct load_info
*info
)
2629 #endif /* !CONFIG_MODULE_SIG */
2631 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2632 static int elf_header_check(struct load_info
*info
)
2634 if (info
->len
< sizeof(*(info
->hdr
)))
2637 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2638 || info
->hdr
->e_type
!= ET_REL
2639 || !elf_check_arch(info
->hdr
)
2640 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2643 if (info
->hdr
->e_shoff
>= info
->len
2644 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2645 info
->len
- info
->hdr
->e_shoff
))
2651 #define COPY_CHUNK_SIZE (16*PAGE_SIZE)
2653 static int copy_chunked_from_user(void *dst
, const void __user
*usrc
, unsigned long len
)
2656 unsigned long n
= min(len
, COPY_CHUNK_SIZE
);
2658 if (copy_from_user(dst
, usrc
, n
) != 0)
2668 /* Sets info->hdr and info->len. */
2669 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2670 struct load_info
*info
)
2675 if (info
->len
< sizeof(*(info
->hdr
)))
2678 err
= security_kernel_module_from_file(NULL
);
2682 /* Suck in entire file: we'll want most of it. */
2683 info
->hdr
= __vmalloc(info
->len
,
2684 GFP_KERNEL
| __GFP_HIGHMEM
| __GFP_NOWARN
, PAGE_KERNEL
);
2688 if (copy_chunked_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2696 /* Sets info->hdr and info->len. */
2697 static int copy_module_from_fd(int fd
, struct load_info
*info
)
2699 struct fd f
= fdget(fd
);
2708 err
= security_kernel_module_from_file(f
.file
);
2712 err
= vfs_getattr(&f
.file
->f_path
, &stat
);
2716 if (stat
.size
> INT_MAX
) {
2721 /* Don't hand 0 to vmalloc, it whines. */
2722 if (stat
.size
== 0) {
2727 info
->hdr
= vmalloc(stat
.size
);
2734 while (pos
< stat
.size
) {
2735 bytes
= kernel_read(f
.file
, pos
, (char *)(info
->hdr
) + pos
,
2753 static void free_copy(struct load_info
*info
)
2758 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2762 /* This should always be true, but let's be sure. */
2763 info
->sechdrs
[0].sh_addr
= 0;
2765 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2766 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2767 if (shdr
->sh_type
!= SHT_NOBITS
2768 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2769 pr_err("Module len %lu truncated\n", info
->len
);
2773 /* Mark all sections sh_addr with their address in the
2775 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2777 #ifndef CONFIG_MODULE_UNLOAD
2778 /* Don't load .exit sections */
2779 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2780 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2784 /* Track but don't keep modinfo and version sections. */
2785 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2786 info
->index
.vers
= 0; /* Pretend no __versions section! */
2788 info
->index
.vers
= find_sec(info
, "__versions");
2789 info
->index
.info
= find_sec(info
, ".modinfo");
2790 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2791 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2796 * Set up our basic convenience variables (pointers to section headers,
2797 * search for module section index etc), and do some basic section
2800 * Return the temporary module pointer (we'll replace it with the final
2801 * one when we move the module sections around).
2803 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2809 /* Set up the convenience variables */
2810 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2811 info
->secstrings
= (void *)info
->hdr
2812 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2814 err
= rewrite_section_headers(info
, flags
);
2816 return ERR_PTR(err
);
2818 /* Find internal symbols and strings. */
2819 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2820 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2821 info
->index
.sym
= i
;
2822 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2823 info
->strtab
= (char *)info
->hdr
2824 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2829 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2830 if (!info
->index
.mod
) {
2831 pr_warn("No module found in object\n");
2832 return ERR_PTR(-ENOEXEC
);
2834 /* This is temporary: point mod into copy of data. */
2835 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2837 if (info
->index
.sym
== 0) {
2838 pr_warn("%s: module has no symbols (stripped?)\n", mod
->name
);
2839 return ERR_PTR(-ENOEXEC
);
2842 info
->index
.pcpu
= find_pcpusec(info
);
2844 /* Check module struct version now, before we try to use module. */
2845 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2846 return ERR_PTR(-ENOEXEC
);
2851 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2853 const char *modmagic
= get_modinfo(info
, "vermagic");
2856 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2859 /* This is allowed: modprobe --force will invalidate it. */
2861 err
= try_to_force_load(mod
, "bad vermagic");
2864 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2865 pr_err("%s: version magic '%s' should be '%s'\n",
2866 mod
->name
, modmagic
, vermagic
);
2870 if (!get_modinfo(info
, "intree"))
2871 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2873 if (get_modinfo(info
, "staging")) {
2874 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2875 pr_warn("%s: module is from the staging directory, the quality "
2876 "is unknown, you have been warned.\n", mod
->name
);
2879 /* Set up license info based on the info section */
2880 set_license(mod
, get_modinfo(info
, "license"));
2885 static int find_module_sections(struct module
*mod
, struct load_info
*info
)
2887 mod
->kp
= section_objs(info
, "__param",
2888 sizeof(*mod
->kp
), &mod
->num_kp
);
2889 mod
->syms
= section_objs(info
, "__ksymtab",
2890 sizeof(*mod
->syms
), &mod
->num_syms
);
2891 mod
->crcs
= section_addr(info
, "__kcrctab");
2892 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2893 sizeof(*mod
->gpl_syms
),
2894 &mod
->num_gpl_syms
);
2895 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2896 mod
->gpl_future_syms
= section_objs(info
,
2897 "__ksymtab_gpl_future",
2898 sizeof(*mod
->gpl_future_syms
),
2899 &mod
->num_gpl_future_syms
);
2900 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2902 #ifdef CONFIG_UNUSED_SYMBOLS
2903 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2904 sizeof(*mod
->unused_syms
),
2905 &mod
->num_unused_syms
);
2906 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2907 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2908 sizeof(*mod
->unused_gpl_syms
),
2909 &mod
->num_unused_gpl_syms
);
2910 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2912 #ifdef CONFIG_CONSTRUCTORS
2913 mod
->ctors
= section_objs(info
, ".ctors",
2914 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2916 mod
->ctors
= section_objs(info
, ".init_array",
2917 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2918 else if (find_sec(info
, ".init_array")) {
2920 * This shouldn't happen with same compiler and binutils
2921 * building all parts of the module.
2923 pr_warn("%s: has both .ctors and .init_array.\n",
2929 #ifdef CONFIG_TRACEPOINTS
2930 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2931 sizeof(*mod
->tracepoints_ptrs
),
2932 &mod
->num_tracepoints
);
2934 #ifdef HAVE_JUMP_LABEL
2935 mod
->jump_entries
= section_objs(info
, "__jump_table",
2936 sizeof(*mod
->jump_entries
),
2937 &mod
->num_jump_entries
);
2939 #ifdef CONFIG_EVENT_TRACING
2940 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2941 sizeof(*mod
->trace_events
),
2942 &mod
->num_trace_events
);
2943 mod
->trace_enums
= section_objs(info
, "_ftrace_enum_map",
2944 sizeof(*mod
->trace_enums
),
2945 &mod
->num_trace_enums
);
2947 #ifdef CONFIG_TRACING
2948 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
2949 sizeof(*mod
->trace_bprintk_fmt_start
),
2950 &mod
->num_trace_bprintk_fmt
);
2952 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2953 /* sechdrs[0].sh_size is always zero */
2954 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
2955 sizeof(*mod
->ftrace_callsites
),
2956 &mod
->num_ftrace_callsites
);
2959 mod
->extable
= section_objs(info
, "__ex_table",
2960 sizeof(*mod
->extable
), &mod
->num_exentries
);
2962 if (section_addr(info
, "__obsparm"))
2963 pr_warn("%s: Ignoring obsolete parameters\n", mod
->name
);
2965 info
->debug
= section_objs(info
, "__verbose",
2966 sizeof(*info
->debug
), &info
->num_debug
);
2971 static int move_module(struct module
*mod
, struct load_info
*info
)
2976 /* Do the allocs. */
2977 ptr
= module_alloc(mod
->core_layout
.size
);
2979 * The pointer to this block is stored in the module structure
2980 * which is inside the block. Just mark it as not being a
2983 kmemleak_not_leak(ptr
);
2987 memset(ptr
, 0, mod
->core_layout
.size
);
2988 mod
->core_layout
.base
= ptr
;
2990 if (mod
->init_layout
.size
) {
2991 ptr
= module_alloc(mod
->init_layout
.size
);
2993 * The pointer to this block is stored in the module structure
2994 * which is inside the block. This block doesn't need to be
2995 * scanned as it contains data and code that will be freed
2996 * after the module is initialized.
2998 kmemleak_ignore(ptr
);
3000 module_memfree(mod
->core_layout
.base
);
3003 memset(ptr
, 0, mod
->init_layout
.size
);
3004 mod
->init_layout
.base
= ptr
;
3006 mod
->init_layout
.base
= NULL
;
3008 /* Transfer each section which specifies SHF_ALLOC */
3009 pr_debug("final section addresses:\n");
3010 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
3012 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
3014 if (!(shdr
->sh_flags
& SHF_ALLOC
))
3017 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
3018 dest
= mod
->init_layout
.base
3019 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
3021 dest
= mod
->core_layout
.base
+ shdr
->sh_entsize
;
3023 if (shdr
->sh_type
!= SHT_NOBITS
)
3024 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
3025 /* Update sh_addr to point to copy in image. */
3026 shdr
->sh_addr
= (unsigned long)dest
;
3027 pr_debug("\t0x%lx %s\n",
3028 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
3034 static int check_module_license_and_versions(struct module
*mod
)
3037 * ndiswrapper is under GPL by itself, but loads proprietary modules.
3038 * Don't use add_taint_module(), as it would prevent ndiswrapper from
3039 * using GPL-only symbols it needs.
3041 if (strcmp(mod
->name
, "ndiswrapper") == 0)
3042 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
3044 /* driverloader was caught wrongly pretending to be under GPL */
3045 if (strcmp(mod
->name
, "driverloader") == 0)
3046 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3047 LOCKDEP_NOW_UNRELIABLE
);
3049 /* lve claims to be GPL but upstream won't provide source */
3050 if (strcmp(mod
->name
, "lve") == 0)
3051 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3052 LOCKDEP_NOW_UNRELIABLE
);
3054 #ifdef CONFIG_MODVERSIONS
3055 if ((mod
->num_syms
&& !mod
->crcs
)
3056 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
3057 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
3058 #ifdef CONFIG_UNUSED_SYMBOLS
3059 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
3060 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
3063 return try_to_force_load(mod
,
3064 "no versions for exported symbols");
3070 static void flush_module_icache(const struct module
*mod
)
3072 mm_segment_t old_fs
;
3074 /* flush the icache in correct context */
3079 * Flush the instruction cache, since we've played with text.
3080 * Do it before processing of module parameters, so the module
3081 * can provide parameter accessor functions of its own.
3083 if (mod
->init_layout
.base
)
3084 flush_icache_range((unsigned long)mod
->init_layout
.base
,
3085 (unsigned long)mod
->init_layout
.base
3086 + mod
->init_layout
.size
);
3087 flush_icache_range((unsigned long)mod
->core_layout
.base
,
3088 (unsigned long)mod
->core_layout
.base
+ mod
->core_layout
.size
);
3093 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
3101 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
3103 /* Module within temporary copy. */
3107 mod
= setup_load_info(info
, flags
);
3111 err
= check_modinfo(mod
, info
, flags
);
3113 return ERR_PTR(err
);
3115 /* Allow arches to frob section contents and sizes. */
3116 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
3117 info
->secstrings
, mod
);
3119 return ERR_PTR(err
);
3121 /* We will do a special allocation for per-cpu sections later. */
3122 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
3124 /* Determine total sizes, and put offsets in sh_entsize. For now
3125 this is done generically; there doesn't appear to be any
3126 special cases for the architectures. */
3127 layout_sections(mod
, info
);
3128 layout_symtab(mod
, info
);
3130 /* Allocate and move to the final place */
3131 err
= move_module(mod
, info
);
3133 return ERR_PTR(err
);
3135 /* Module has been copied to its final place now: return it. */
3136 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
3137 kmemleak_load_module(mod
, info
);
3141 /* mod is no longer valid after this! */
3142 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
3144 percpu_modfree(mod
);
3145 module_arch_freeing_init(mod
);
3146 module_memfree(mod
->init_layout
.base
);
3147 module_memfree(mod
->core_layout
.base
);
3150 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
3151 const Elf_Shdr
*sechdrs
,
3157 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
3159 /* Sort exception table now relocations are done. */
3160 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
3162 /* Copy relocated percpu area over. */
3163 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
3164 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
3166 /* Setup kallsyms-specific fields. */
3167 add_kallsyms(mod
, info
);
3169 /* Arch-specific module finalizing. */
3170 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3173 /* Is this module of this name done loading? No locks held. */
3174 static bool finished_loading(const char *name
)
3180 * The module_mutex should not be a heavily contended lock;
3181 * if we get the occasional sleep here, we'll go an extra iteration
3182 * in the wait_event_interruptible(), which is harmless.
3184 sched_annotate_sleep();
3185 mutex_lock(&module_mutex
);
3186 mod
= find_module_all(name
, strlen(name
), true);
3187 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3188 || mod
->state
== MODULE_STATE_GOING
;
3189 mutex_unlock(&module_mutex
);
3194 /* Call module constructors. */
3195 static void do_mod_ctors(struct module
*mod
)
3197 #ifdef CONFIG_CONSTRUCTORS
3200 for (i
= 0; i
< mod
->num_ctors
; i
++)
3205 /* For freeing module_init on success, in case kallsyms traversing */
3206 struct mod_initfree
{
3207 struct rcu_head rcu
;
3211 static void do_free_init(struct rcu_head
*head
)
3213 struct mod_initfree
*m
= container_of(head
, struct mod_initfree
, rcu
);
3214 module_memfree(m
->module_init
);
3219 * This is where the real work happens.
3221 * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
3222 * helper command 'lx-symbols'.
3224 static noinline
int do_init_module(struct module
*mod
)
3227 struct mod_initfree
*freeinit
;
3229 freeinit
= kmalloc(sizeof(*freeinit
), GFP_KERNEL
);
3234 freeinit
->module_init
= mod
->init_layout
.base
;
3237 * We want to find out whether @mod uses async during init. Clear
3238 * PF_USED_ASYNC. async_schedule*() will set it.
3240 current
->flags
&= ~PF_USED_ASYNC
;
3243 /* Start the module */
3244 if (mod
->init
!= NULL
)
3245 ret
= do_one_initcall(mod
->init
);
3247 goto fail_free_freeinit
;
3250 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3251 "follow 0/-E convention\n"
3252 "%s: loading module anyway...\n",
3253 __func__
, mod
->name
, ret
, __func__
);
3257 /* Now it's a first class citizen! */
3258 mod
->state
= MODULE_STATE_LIVE
;
3259 blocking_notifier_call_chain(&module_notify_list
,
3260 MODULE_STATE_LIVE
, mod
);
3263 * We need to finish all async code before the module init sequence
3264 * is done. This has potential to deadlock. For example, a newly
3265 * detected block device can trigger request_module() of the
3266 * default iosched from async probing task. Once userland helper
3267 * reaches here, async_synchronize_full() will wait on the async
3268 * task waiting on request_module() and deadlock.
3270 * This deadlock is avoided by perfomring async_synchronize_full()
3271 * iff module init queued any async jobs. This isn't a full
3272 * solution as it will deadlock the same if module loading from
3273 * async jobs nests more than once; however, due to the various
3274 * constraints, this hack seems to be the best option for now.
3275 * Please refer to the following thread for details.
3277 * http://thread.gmane.org/gmane.linux.kernel/1420814
3279 if (!mod
->async_probe_requested
&& (current
->flags
& PF_USED_ASYNC
))
3280 async_synchronize_full();
3282 mutex_lock(&module_mutex
);
3283 /* Drop initial reference. */
3285 trim_init_extable(mod
);
3286 #ifdef CONFIG_KALLSYMS
3287 /* Switch to core kallsyms now init is done: kallsyms may be walking! */
3288 rcu_assign_pointer(mod
->kallsyms
, &mod
->core_kallsyms
);
3290 mod_tree_remove_init(mod
);
3291 disable_ro_nx(&mod
->init_layout
);
3292 module_arch_freeing_init(mod
);
3293 mod
->init_layout
.base
= NULL
;
3294 mod
->init_layout
.size
= 0;
3295 mod
->init_layout
.ro_size
= 0;
3296 mod
->init_layout
.text_size
= 0;
3298 * We want to free module_init, but be aware that kallsyms may be
3299 * walking this with preempt disabled. In all the failure paths, we
3300 * call synchronize_sched(), but we don't want to slow down the success
3301 * path, so use actual RCU here.
3303 call_rcu_sched(&freeinit
->rcu
, do_free_init
);
3304 mutex_unlock(&module_mutex
);
3305 wake_up_all(&module_wq
);
3312 /* Try to protect us from buggy refcounters. */
3313 mod
->state
= MODULE_STATE_GOING
;
3314 synchronize_sched();
3316 blocking_notifier_call_chain(&module_notify_list
,
3317 MODULE_STATE_GOING
, mod
);
3318 ftrace_release_mod(mod
);
3320 wake_up_all(&module_wq
);
3324 static int may_init_module(void)
3326 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3333 * We try to place it in the list now to make sure it's unique before
3334 * we dedicate too many resources. In particular, temporary percpu
3335 * memory exhaustion.
3337 static int add_unformed_module(struct module
*mod
)
3342 mod
->state
= MODULE_STATE_UNFORMED
;
3345 mutex_lock(&module_mutex
);
3346 old
= find_module_all(mod
->name
, strlen(mod
->name
), true);
3348 if (old
->state
== MODULE_STATE_COMING
3349 || old
->state
== MODULE_STATE_UNFORMED
) {
3350 /* Wait in case it fails to load. */
3351 mutex_unlock(&module_mutex
);
3352 err
= wait_event_interruptible(module_wq
,
3353 finished_loading(mod
->name
));
3361 mod_update_bounds(mod
);
3362 list_add_rcu(&mod
->list
, &modules
);
3363 mod_tree_insert(mod
);
3367 mutex_unlock(&module_mutex
);
3372 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3376 mutex_lock(&module_mutex
);
3378 /* Find duplicate symbols (must be called under lock). */
3379 err
= verify_export_symbols(mod
);
3383 /* This relies on module_mutex for list integrity. */
3384 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3386 /* Set RO and NX regions */
3387 module_enable_ro(mod
);
3388 module_enable_nx(mod
);
3390 /* Mark state as coming so strong_try_module_get() ignores us,
3391 * but kallsyms etc. can see us. */
3392 mod
->state
= MODULE_STATE_COMING
;
3393 mutex_unlock(&module_mutex
);
3395 ftrace_module_enable(mod
);
3396 blocking_notifier_call_chain(&module_notify_list
,
3397 MODULE_STATE_COMING
, mod
);
3401 mutex_unlock(&module_mutex
);
3405 static int unknown_module_param_cb(char *param
, char *val
, const char *modname
,
3408 struct module
*mod
= arg
;
3411 if (strcmp(param
, "async_probe") == 0) {
3412 mod
->async_probe_requested
= true;
3416 /* Check for magic 'dyndbg' arg */
3417 ret
= ddebug_dyndbg_module_param_cb(param
, val
, modname
);
3419 pr_warn("%s: unknown parameter '%s' ignored\n", modname
, param
);
3423 /* Allocate and load the module: note that size of section 0 is always
3424 zero, and we rely on this for optional sections. */
3425 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3432 err
= module_sig_check(info
);
3436 err
= elf_header_check(info
);
3440 /* Figure out module layout, and allocate all the memory. */
3441 mod
= layout_and_allocate(info
, flags
);
3447 /* Reserve our place in the list. */
3448 err
= add_unformed_module(mod
);
3452 #ifdef CONFIG_MODULE_SIG
3453 mod
->sig_ok
= info
->sig_ok
;
3455 pr_notice_once("%s: module verification failed: signature "
3456 "and/or required key missing - tainting "
3457 "kernel\n", mod
->name
);
3458 add_taint_module(mod
, TAINT_UNSIGNED_MODULE
, LOCKDEP_STILL_OK
);
3462 /* To avoid stressing percpu allocator, do this once we're unique. */
3463 err
= percpu_modalloc(mod
, info
);
3467 /* Now module is in final location, initialize linked lists, etc. */
3468 err
= module_unload_init(mod
);
3472 init_param_lock(mod
);
3474 /* Now we've got everything in the final locations, we can
3475 * find optional sections. */
3476 err
= find_module_sections(mod
, info
);
3480 err
= check_module_license_and_versions(mod
);
3484 /* Set up MODINFO_ATTR fields */
3485 setup_modinfo(mod
, info
);
3487 /* Fix up syms, so that st_value is a pointer to location. */
3488 err
= simplify_symbols(mod
, info
);
3492 err
= apply_relocations(mod
, info
);
3496 err
= post_relocation(mod
, info
);
3500 flush_module_icache(mod
);
3502 /* Now copy in args */
3503 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3504 if (IS_ERR(mod
->args
)) {
3505 err
= PTR_ERR(mod
->args
);
3506 goto free_arch_cleanup
;
3509 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3511 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3512 ftrace_module_init(mod
);
3514 /* Finally it's fully formed, ready to start executing. */
3515 err
= complete_formation(mod
, info
);
3517 goto ddebug_cleanup
;
3519 /* Module is ready to execute: parsing args may do that. */
3520 after_dashes
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3522 unknown_module_param_cb
);
3523 if (IS_ERR(after_dashes
)) {
3524 err
= PTR_ERR(after_dashes
);
3526 } else if (after_dashes
) {
3527 pr_warn("%s: parameters '%s' after `--' ignored\n",
3528 mod
->name
, after_dashes
);
3531 /* Link in to syfs. */
3532 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3536 /* Get rid of temporary copy. */
3540 trace_module_load(mod
);
3542 return do_init_module(mod
);
3545 /* module_bug_cleanup needs module_mutex protection */
3546 mutex_lock(&module_mutex
);
3547 module_bug_cleanup(mod
);
3548 mutex_unlock(&module_mutex
);
3550 blocking_notifier_call_chain(&module_notify_list
,
3551 MODULE_STATE_GOING
, mod
);
3553 /* we can't deallocate the module until we clear memory protection */
3554 module_disable_ro(mod
);
3555 module_disable_nx(mod
);
3558 dynamic_debug_remove(info
->debug
);
3559 synchronize_sched();
3562 module_arch_cleanup(mod
);
3566 module_unload_free(mod
);
3568 mutex_lock(&module_mutex
);
3569 /* Unlink carefully: kallsyms could be walking list. */
3570 list_del_rcu(&mod
->list
);
3571 mod_tree_remove(mod
);
3572 wake_up_all(&module_wq
);
3573 /* Wait for RCU-sched synchronizing before releasing mod->list. */
3574 synchronize_sched();
3575 mutex_unlock(&module_mutex
);
3578 * Ftrace needs to clean up what it initialized.
3579 * This does nothing if ftrace_module_init() wasn't called,
3580 * but it must be called outside of module_mutex.
3582 ftrace_release_mod(mod
);
3583 /* Free lock-classes; relies on the preceding sync_rcu() */
3584 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
3586 module_deallocate(mod
, info
);
3592 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3593 unsigned long, len
, const char __user
*, uargs
)
3596 struct load_info info
= { };
3598 err
= may_init_module();
3602 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3605 err
= copy_module_from_user(umod
, len
, &info
);
3609 return load_module(&info
, uargs
, 0);
3612 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3615 struct load_info info
= { };
3617 err
= may_init_module();
3621 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3623 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3624 |MODULE_INIT_IGNORE_VERMAGIC
))
3627 err
= copy_module_from_fd(fd
, &info
);
3631 return load_module(&info
, uargs
, flags
);
3634 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3636 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3639 #ifdef CONFIG_KALLSYMS
3641 * This ignores the intensely annoying "mapping symbols" found
3642 * in ARM ELF files: $a, $t and $d.
3644 static inline int is_arm_mapping_symbol(const char *str
)
3646 if (str
[0] == '.' && str
[1] == 'L')
3648 return str
[0] == '$' && strchr("axtd", str
[1])
3649 && (str
[2] == '\0' || str
[2] == '.');
3652 static const char *symname(struct mod_kallsyms
*kallsyms
, unsigned int symnum
)
3654 return kallsyms
->strtab
+ kallsyms
->symtab
[symnum
].st_name
;
3657 static const char *get_ksymbol(struct module
*mod
,
3659 unsigned long *size
,
3660 unsigned long *offset
)
3662 unsigned int i
, best
= 0;
3663 unsigned long nextval
;
3664 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3666 /* At worse, next value is at end of module */
3667 if (within_module_init(addr
, mod
))
3668 nextval
= (unsigned long)mod
->init_layout
.base
+mod
->init_layout
.text_size
;
3670 nextval
= (unsigned long)mod
->core_layout
.base
+mod
->core_layout
.text_size
;
3672 /* Scan for closest preceding symbol, and next symbol. (ELF
3673 starts real symbols at 1). */
3674 for (i
= 1; i
< kallsyms
->num_symtab
; i
++) {
3675 if (kallsyms
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3678 /* We ignore unnamed symbols: they're uninformative
3679 * and inserted at a whim. */
3680 if (*symname(kallsyms
, i
) == '\0'
3681 || is_arm_mapping_symbol(symname(kallsyms
, i
)))
3684 if (kallsyms
->symtab
[i
].st_value
<= addr
3685 && kallsyms
->symtab
[i
].st_value
> kallsyms
->symtab
[best
].st_value
)
3687 if (kallsyms
->symtab
[i
].st_value
> addr
3688 && kallsyms
->symtab
[i
].st_value
< nextval
)
3689 nextval
= kallsyms
->symtab
[i
].st_value
;
3696 *size
= nextval
- kallsyms
->symtab
[best
].st_value
;
3698 *offset
= addr
- kallsyms
->symtab
[best
].st_value
;
3699 return symname(kallsyms
, best
);
3702 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3703 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3704 const char *module_address_lookup(unsigned long addr
,
3705 unsigned long *size
,
3706 unsigned long *offset
,
3710 const char *ret
= NULL
;
3714 mod
= __module_address(addr
);
3717 *modname
= mod
->name
;
3718 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3720 /* Make a copy in here where it's safe */
3722 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3730 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3735 list_for_each_entry_rcu(mod
, &modules
, list
) {
3736 if (mod
->state
== MODULE_STATE_UNFORMED
)
3738 if (within_module(addr
, mod
)) {
3741 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3744 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3754 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3755 unsigned long *offset
, char *modname
, char *name
)
3760 list_for_each_entry_rcu(mod
, &modules
, list
) {
3761 if (mod
->state
== MODULE_STATE_UNFORMED
)
3763 if (within_module(addr
, mod
)) {
3766 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3770 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3772 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3782 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3783 char *name
, char *module_name
, int *exported
)
3788 list_for_each_entry_rcu(mod
, &modules
, list
) {
3789 struct mod_kallsyms
*kallsyms
;
3791 if (mod
->state
== MODULE_STATE_UNFORMED
)
3793 kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3794 if (symnum
< kallsyms
->num_symtab
) {
3795 *value
= kallsyms
->symtab
[symnum
].st_value
;
3796 *type
= kallsyms
->symtab
[symnum
].st_info
;
3797 strlcpy(name
, symname(kallsyms
, symnum
), KSYM_NAME_LEN
);
3798 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3799 *exported
= is_exported(name
, *value
, mod
);
3803 symnum
-= kallsyms
->num_symtab
;
3809 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3812 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3814 for (i
= 0; i
< kallsyms
->num_symtab
; i
++)
3815 if (strcmp(name
, symname(kallsyms
, i
)) == 0 &&
3816 kallsyms
->symtab
[i
].st_info
!= 'U')
3817 return kallsyms
->symtab
[i
].st_value
;
3821 /* Look for this name: can be of form module:name. */
3822 unsigned long module_kallsyms_lookup_name(const char *name
)
3826 unsigned long ret
= 0;
3828 /* Don't lock: we're in enough trouble already. */
3830 if ((colon
= strchr(name
, ':')) != NULL
) {
3831 if ((mod
= find_module_all(name
, colon
- name
, false)) != NULL
)
3832 ret
= mod_find_symname(mod
, colon
+1);
3834 list_for_each_entry_rcu(mod
, &modules
, list
) {
3835 if (mod
->state
== MODULE_STATE_UNFORMED
)
3837 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3845 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3846 struct module
*, unsigned long),
3853 module_assert_mutex();
3855 list_for_each_entry(mod
, &modules
, list
) {
3856 /* We hold module_mutex: no need for rcu_dereference_sched */
3857 struct mod_kallsyms
*kallsyms
= mod
->kallsyms
;
3859 if (mod
->state
== MODULE_STATE_UNFORMED
)
3861 for (i
= 0; i
< kallsyms
->num_symtab
; i
++) {
3862 ret
= fn(data
, symname(kallsyms
, i
),
3863 mod
, kallsyms
->symtab
[i
].st_value
);
3870 #endif /* CONFIG_KALLSYMS */
3872 static char *module_flags(struct module
*mod
, char *buf
)
3876 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
3878 mod
->state
== MODULE_STATE_GOING
||
3879 mod
->state
== MODULE_STATE_COMING
) {
3881 bx
+= module_flags_taint(mod
, buf
+ bx
);
3882 /* Show a - for module-is-being-unloaded */
3883 if (mod
->state
== MODULE_STATE_GOING
)
3885 /* Show a + for module-is-being-loaded */
3886 if (mod
->state
== MODULE_STATE_COMING
)
3895 #ifdef CONFIG_PROC_FS
3896 /* Called by the /proc file system to return a list of modules. */
3897 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3899 mutex_lock(&module_mutex
);
3900 return seq_list_start(&modules
, *pos
);
3903 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3905 return seq_list_next(p
, &modules
, pos
);
3908 static void m_stop(struct seq_file
*m
, void *p
)
3910 mutex_unlock(&module_mutex
);
3913 static int m_show(struct seq_file
*m
, void *p
)
3915 struct module
*mod
= list_entry(p
, struct module
, list
);
3918 /* We always ignore unformed modules. */
3919 if (mod
->state
== MODULE_STATE_UNFORMED
)
3922 seq_printf(m
, "%s %u",
3923 mod
->name
, mod
->init_layout
.size
+ mod
->core_layout
.size
);
3924 print_unload_info(m
, mod
);
3926 /* Informative for users. */
3927 seq_printf(m
, " %s",
3928 mod
->state
== MODULE_STATE_GOING
? "Unloading" :
3929 mod
->state
== MODULE_STATE_COMING
? "Loading" :
3931 /* Used by oprofile and other similar tools. */
3932 seq_printf(m
, " 0x%pK", mod
->core_layout
.base
);
3936 seq_printf(m
, " %s", module_flags(mod
, buf
));
3942 /* Format: modulename size refcount deps address
3944 Where refcount is a number or -, and deps is a comma-separated list
3947 static const struct seq_operations modules_op
= {
3954 static int modules_open(struct inode
*inode
, struct file
*file
)
3956 return seq_open(file
, &modules_op
);
3959 static const struct file_operations proc_modules_operations
= {
3960 .open
= modules_open
,
3962 .llseek
= seq_lseek
,
3963 .release
= seq_release
,
3966 static int __init
proc_modules_init(void)
3968 proc_create("modules", 0, NULL
, &proc_modules_operations
);
3971 module_init(proc_modules_init
);
3974 /* Given an address, look for it in the module exception tables. */
3975 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
3977 const struct exception_table_entry
*e
= NULL
;
3981 list_for_each_entry_rcu(mod
, &modules
, list
) {
3982 if (mod
->state
== MODULE_STATE_UNFORMED
)
3984 if (mod
->num_exentries
== 0)
3987 e
= search_extable(mod
->extable
,
3988 mod
->extable
+ mod
->num_exentries
- 1,
3995 /* Now, if we found one, we are running inside it now, hence
3996 we cannot unload the module, hence no refcnt needed. */
4001 * is_module_address - is this address inside a module?
4002 * @addr: the address to check.
4004 * See is_module_text_address() if you simply want to see if the address
4005 * is code (not data).
4007 bool is_module_address(unsigned long addr
)
4012 ret
= __module_address(addr
) != NULL
;
4019 * __module_address - get the module which contains an address.
4020 * @addr: the address.
4022 * Must be called with preempt disabled or module mutex held so that
4023 * module doesn't get freed during this.
4025 struct module
*__module_address(unsigned long addr
)
4029 if (addr
< module_addr_min
|| addr
> module_addr_max
)
4032 module_assert_mutex_or_preempt();
4034 mod
= mod_find(addr
);
4036 BUG_ON(!within_module(addr
, mod
));
4037 if (mod
->state
== MODULE_STATE_UNFORMED
)
4042 EXPORT_SYMBOL_GPL(__module_address
);
4045 * is_module_text_address - is this address inside module code?
4046 * @addr: the address to check.
4048 * See is_module_address() if you simply want to see if the address is
4049 * anywhere in a module. See kernel_text_address() for testing if an
4050 * address corresponds to kernel or module code.
4052 bool is_module_text_address(unsigned long addr
)
4057 ret
= __module_text_address(addr
) != NULL
;
4064 * __module_text_address - get the module whose code contains an address.
4065 * @addr: the address.
4067 * Must be called with preempt disabled or module mutex held so that
4068 * module doesn't get freed during this.
4070 struct module
*__module_text_address(unsigned long addr
)
4072 struct module
*mod
= __module_address(addr
);
4074 /* Make sure it's within the text section. */
4075 if (!within(addr
, mod
->init_layout
.base
, mod
->init_layout
.text_size
)
4076 && !within(addr
, mod
->core_layout
.base
, mod
->core_layout
.text_size
))
4081 EXPORT_SYMBOL_GPL(__module_text_address
);
4083 /* Don't grab lock, we're oopsing. */
4084 void print_modules(void)
4089 printk(KERN_DEFAULT
"Modules linked in:");
4090 /* Most callers should already have preempt disabled, but make sure */
4092 list_for_each_entry_rcu(mod
, &modules
, list
) {
4093 if (mod
->state
== MODULE_STATE_UNFORMED
)
4095 pr_cont(" %s%s", mod
->name
, module_flags(mod
, buf
));
4098 if (last_unloaded_module
[0])
4099 pr_cont(" [last unloaded: %s]", last_unloaded_module
);
4103 #ifdef CONFIG_MODVERSIONS
4104 /* Generate the signature for all relevant module structures here.
4105 * If these change, we don't want to try to parse the module. */
4106 void module_layout(struct module
*mod
,
4107 struct modversion_info
*ver
,
4108 struct kernel_param
*kp
,
4109 struct kernel_symbol
*ks
,
4110 struct tracepoint
* const *tp
)
4113 EXPORT_SYMBOL(module_layout
);