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/livepatch.h>
57 #include <linux/async.h>
58 #include <linux/percpu.h>
59 #include <linux/kmemleak.h>
60 #include <linux/jump_label.h>
61 #include <linux/pfn.h>
62 #include <linux/bsearch.h>
63 #include <uapi/linux/module.h>
64 #include "module-internal.h"
66 #define CREATE_TRACE_POINTS
67 #include <trace/events/module.h>
69 #ifndef ARCH_SHF_SMALL
70 #define ARCH_SHF_SMALL 0
74 * Modules' sections will be aligned on page boundaries
75 * to ensure complete separation of code and data, but
76 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
78 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
79 # define debug_align(X) ALIGN(X, PAGE_SIZE)
81 # define debug_align(X) (X)
84 /* If this is set, the section belongs in the init part of the module */
85 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
89 * 1) List of modules (also safely readable with preempt_disable),
90 * 2) module_use links,
91 * 3) module_addr_min/module_addr_max.
92 * (delete and add uses RCU list operations). */
93 DEFINE_MUTEX(module_mutex
);
94 EXPORT_SYMBOL_GPL(module_mutex
);
95 static LIST_HEAD(modules
);
97 #ifdef CONFIG_MODULES_TREE_LOOKUP
100 * Use a latched RB-tree for __module_address(); this allows us to use
101 * RCU-sched lookups of the address from any context.
103 * This is conditional on PERF_EVENTS || TRACING because those can really hit
104 * __module_address() hard by doing a lot of stack unwinding; potentially from
108 static __always_inline
unsigned long __mod_tree_val(struct latch_tree_node
*n
)
110 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
112 return (unsigned long)layout
->base
;
115 static __always_inline
unsigned long __mod_tree_size(struct latch_tree_node
*n
)
117 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
119 return (unsigned long)layout
->size
;
122 static __always_inline
bool
123 mod_tree_less(struct latch_tree_node
*a
, struct latch_tree_node
*b
)
125 return __mod_tree_val(a
) < __mod_tree_val(b
);
128 static __always_inline
int
129 mod_tree_comp(void *key
, struct latch_tree_node
*n
)
131 unsigned long val
= (unsigned long)key
;
132 unsigned long start
, end
;
134 start
= __mod_tree_val(n
);
138 end
= start
+ __mod_tree_size(n
);
145 static const struct latch_tree_ops mod_tree_ops
= {
146 .less
= mod_tree_less
,
147 .comp
= mod_tree_comp
,
150 static struct mod_tree_root
{
151 struct latch_tree_root root
;
152 unsigned long addr_min
;
153 unsigned long addr_max
;
154 } mod_tree __cacheline_aligned
= {
158 #define module_addr_min mod_tree.addr_min
159 #define module_addr_max mod_tree.addr_max
161 static noinline
void __mod_tree_insert(struct mod_tree_node
*node
)
163 latch_tree_insert(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
166 static void __mod_tree_remove(struct mod_tree_node
*node
)
168 latch_tree_erase(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
172 * These modifications: insert, remove_init and remove; are serialized by the
175 static void mod_tree_insert(struct module
*mod
)
177 mod
->core_layout
.mtn
.mod
= mod
;
178 mod
->init_layout
.mtn
.mod
= mod
;
180 __mod_tree_insert(&mod
->core_layout
.mtn
);
181 if (mod
->init_layout
.size
)
182 __mod_tree_insert(&mod
->init_layout
.mtn
);
185 static void mod_tree_remove_init(struct module
*mod
)
187 if (mod
->init_layout
.size
)
188 __mod_tree_remove(&mod
->init_layout
.mtn
);
191 static void mod_tree_remove(struct module
*mod
)
193 __mod_tree_remove(&mod
->core_layout
.mtn
);
194 mod_tree_remove_init(mod
);
197 static struct module
*mod_find(unsigned long addr
)
199 struct latch_tree_node
*ltn
;
201 ltn
= latch_tree_find((void *)addr
, &mod_tree
.root
, &mod_tree_ops
);
205 return container_of(ltn
, struct mod_tree_node
, node
)->mod
;
208 #else /* MODULES_TREE_LOOKUP */
210 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
212 static void mod_tree_insert(struct module
*mod
) { }
213 static void mod_tree_remove_init(struct module
*mod
) { }
214 static void mod_tree_remove(struct module
*mod
) { }
216 static struct module
*mod_find(unsigned long addr
)
220 list_for_each_entry_rcu(mod
, &modules
, list
) {
221 if (within_module(addr
, mod
))
228 #endif /* MODULES_TREE_LOOKUP */
231 * Bounds of module text, for speeding up __module_address.
232 * Protected by module_mutex.
234 static void __mod_update_bounds(void *base
, unsigned int size
)
236 unsigned long min
= (unsigned long)base
;
237 unsigned long max
= min
+ size
;
239 if (min
< module_addr_min
)
240 module_addr_min
= min
;
241 if (max
> module_addr_max
)
242 module_addr_max
= max
;
245 static void mod_update_bounds(struct module
*mod
)
247 __mod_update_bounds(mod
->core_layout
.base
, mod
->core_layout
.size
);
248 if (mod
->init_layout
.size
)
249 __mod_update_bounds(mod
->init_layout
.base
, mod
->init_layout
.size
);
252 #ifdef CONFIG_KGDB_KDB
253 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
254 #endif /* CONFIG_KGDB_KDB */
256 static void module_assert_mutex(void)
258 lockdep_assert_held(&module_mutex
);
261 static void module_assert_mutex_or_preempt(void)
263 #ifdef CONFIG_LOCKDEP
264 if (unlikely(!debug_locks
))
267 WARN_ON(!rcu_read_lock_sched_held() &&
268 !lockdep_is_held(&module_mutex
));
272 static bool sig_enforce
= IS_ENABLED(CONFIG_MODULE_SIG_FORCE
);
273 #ifndef CONFIG_MODULE_SIG_FORCE
274 module_param(sig_enforce
, bool_enable_only
, 0644);
275 #endif /* !CONFIG_MODULE_SIG_FORCE */
277 /* Block module loading/unloading? */
278 int modules_disabled
= 0;
279 core_param(nomodule
, modules_disabled
, bint
, 0);
281 /* Waiting for a module to finish initializing? */
282 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
284 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
286 int register_module_notifier(struct notifier_block
*nb
)
288 return blocking_notifier_chain_register(&module_notify_list
, nb
);
290 EXPORT_SYMBOL(register_module_notifier
);
292 int unregister_module_notifier(struct notifier_block
*nb
)
294 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
296 EXPORT_SYMBOL(unregister_module_notifier
);
302 char *secstrings
, *strtab
;
303 unsigned long symoffs
, stroffs
;
304 struct _ddebug
*debug
;
305 unsigned int num_debug
;
307 #ifdef CONFIG_KALLSYMS
308 unsigned long mod_kallsyms_init_off
;
311 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
315 /* We require a truly strong try_module_get(): 0 means failure due to
316 ongoing or failed initialization etc. */
317 static inline int strong_try_module_get(struct module
*mod
)
319 BUG_ON(mod
&& mod
->state
== MODULE_STATE_UNFORMED
);
320 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
322 if (try_module_get(mod
))
328 static inline void add_taint_module(struct module
*mod
, unsigned flag
,
329 enum lockdep_ok lockdep_ok
)
331 add_taint(flag
, lockdep_ok
);
332 mod
->taints
|= (1U << flag
);
336 * A thread that wants to hold a reference to a module only while it
337 * is running can call this to safely exit. nfsd and lockd use this.
339 void __noreturn
__module_put_and_exit(struct module
*mod
, long code
)
344 EXPORT_SYMBOL(__module_put_and_exit
);
346 /* Find a module section: 0 means not found. */
347 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
351 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
352 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
353 /* Alloc bit cleared means "ignore it." */
354 if ((shdr
->sh_flags
& SHF_ALLOC
)
355 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
361 /* Find a module section, or NULL. */
362 static void *section_addr(const struct load_info
*info
, const char *name
)
364 /* Section 0 has sh_addr 0. */
365 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
368 /* Find a module section, or NULL. Fill in number of "objects" in section. */
369 static void *section_objs(const struct load_info
*info
,
374 unsigned int sec
= find_sec(info
, name
);
376 /* Section 0 has sh_addr 0 and sh_size 0. */
377 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
378 return (void *)info
->sechdrs
[sec
].sh_addr
;
381 /* Provided by the linker */
382 extern const struct kernel_symbol __start___ksymtab
[];
383 extern const struct kernel_symbol __stop___ksymtab
[];
384 extern const struct kernel_symbol __start___ksymtab_gpl
[];
385 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
386 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
387 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
388 extern const unsigned long __start___kcrctab
[];
389 extern const unsigned long __start___kcrctab_gpl
[];
390 extern const unsigned long __start___kcrctab_gpl_future
[];
391 #ifdef CONFIG_UNUSED_SYMBOLS
392 extern const struct kernel_symbol __start___ksymtab_unused
[];
393 extern const struct kernel_symbol __stop___ksymtab_unused
[];
394 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
395 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
396 extern const unsigned long __start___kcrctab_unused
[];
397 extern const unsigned long __start___kcrctab_unused_gpl
[];
400 #ifndef CONFIG_MODVERSIONS
401 #define symversion(base, idx) NULL
403 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
406 static bool each_symbol_in_section(const struct symsearch
*arr
,
407 unsigned int arrsize
,
408 struct module
*owner
,
409 bool (*fn
)(const struct symsearch
*syms
,
410 struct module
*owner
,
416 for (j
= 0; j
< arrsize
; j
++) {
417 if (fn(&arr
[j
], owner
, data
))
424 /* Returns true as soon as fn returns true, otherwise false. */
425 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
426 struct module
*owner
,
431 static const struct symsearch arr
[] = {
432 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
433 NOT_GPL_ONLY
, false },
434 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
435 __start___kcrctab_gpl
,
437 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
438 __start___kcrctab_gpl_future
,
439 WILL_BE_GPL_ONLY
, false },
440 #ifdef CONFIG_UNUSED_SYMBOLS
441 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
442 __start___kcrctab_unused
,
443 NOT_GPL_ONLY
, true },
444 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
445 __start___kcrctab_unused_gpl
,
450 module_assert_mutex_or_preempt();
452 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
455 list_for_each_entry_rcu(mod
, &modules
, list
) {
456 struct symsearch arr
[] = {
457 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
458 NOT_GPL_ONLY
, false },
459 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
462 { mod
->gpl_future_syms
,
463 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
464 mod
->gpl_future_crcs
,
465 WILL_BE_GPL_ONLY
, false },
466 #ifdef CONFIG_UNUSED_SYMBOLS
468 mod
->unused_syms
+ mod
->num_unused_syms
,
470 NOT_GPL_ONLY
, true },
471 { mod
->unused_gpl_syms
,
472 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
473 mod
->unused_gpl_crcs
,
478 if (mod
->state
== MODULE_STATE_UNFORMED
)
481 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
486 EXPORT_SYMBOL_GPL(each_symbol_section
);
488 struct find_symbol_arg
{
495 struct module
*owner
;
496 const unsigned long *crc
;
497 const struct kernel_symbol
*sym
;
500 static bool check_symbol(const struct symsearch
*syms
,
501 struct module
*owner
,
502 unsigned int symnum
, void *data
)
504 struct find_symbol_arg
*fsa
= data
;
507 if (syms
->licence
== GPL_ONLY
)
509 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
510 pr_warn("Symbol %s is being used by a non-GPL module, "
511 "which will not be allowed in the future\n",
516 #ifdef CONFIG_UNUSED_SYMBOLS
517 if (syms
->unused
&& fsa
->warn
) {
518 pr_warn("Symbol %s is marked as UNUSED, however this module is "
519 "using it.\n", fsa
->name
);
520 pr_warn("This symbol will go away in the future.\n");
521 pr_warn("Please evaluate if this is the right api to use and "
522 "if it really is, submit a report to the linux kernel "
523 "mailing list together with submitting your code for "
529 fsa
->crc
= symversion(syms
->crcs
, symnum
);
530 fsa
->sym
= &syms
->start
[symnum
];
534 static int cmp_name(const void *va
, const void *vb
)
537 const struct kernel_symbol
*b
;
539 return strcmp(a
, b
->name
);
542 static bool find_symbol_in_section(const struct symsearch
*syms
,
543 struct module
*owner
,
546 struct find_symbol_arg
*fsa
= data
;
547 struct kernel_symbol
*sym
;
549 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
550 sizeof(struct kernel_symbol
), cmp_name
);
552 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
558 /* Find a symbol and return it, along with, (optional) crc and
559 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
560 const struct kernel_symbol
*find_symbol(const char *name
,
561 struct module
**owner
,
562 const unsigned long **crc
,
566 struct find_symbol_arg fsa
;
572 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
580 pr_debug("Failed to find symbol %s\n", name
);
583 EXPORT_SYMBOL_GPL(find_symbol
);
586 * Search for module by name: must hold module_mutex (or preempt disabled
587 * for read-only access).
589 static struct module
*find_module_all(const char *name
, size_t len
,
594 module_assert_mutex_or_preempt();
596 list_for_each_entry(mod
, &modules
, list
) {
597 if (!even_unformed
&& mod
->state
== MODULE_STATE_UNFORMED
)
599 if (strlen(mod
->name
) == len
&& !memcmp(mod
->name
, name
, len
))
605 struct module
*find_module(const char *name
)
607 module_assert_mutex();
608 return find_module_all(name
, strlen(name
), false);
610 EXPORT_SYMBOL_GPL(find_module
);
614 static inline void __percpu
*mod_percpu(struct module
*mod
)
619 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
621 Elf_Shdr
*pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
622 unsigned long align
= pcpusec
->sh_addralign
;
624 if (!pcpusec
->sh_size
)
627 if (align
> PAGE_SIZE
) {
628 pr_warn("%s: per-cpu alignment %li > %li\n",
629 mod
->name
, align
, PAGE_SIZE
);
633 mod
->percpu
= __alloc_reserved_percpu(pcpusec
->sh_size
, align
);
635 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
636 mod
->name
, (unsigned long)pcpusec
->sh_size
);
639 mod
->percpu_size
= pcpusec
->sh_size
;
643 static void percpu_modfree(struct module
*mod
)
645 free_percpu(mod
->percpu
);
648 static unsigned int find_pcpusec(struct load_info
*info
)
650 return find_sec(info
, ".data..percpu");
653 static void percpu_modcopy(struct module
*mod
,
654 const void *from
, unsigned long size
)
658 for_each_possible_cpu(cpu
)
659 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
663 * is_module_percpu_address - test whether address is from module static percpu
664 * @addr: address to test
666 * Test whether @addr belongs to module static percpu area.
669 * %true if @addr is from module static percpu area
671 bool is_module_percpu_address(unsigned long addr
)
678 list_for_each_entry_rcu(mod
, &modules
, list
) {
679 if (mod
->state
== MODULE_STATE_UNFORMED
)
681 if (!mod
->percpu_size
)
683 for_each_possible_cpu(cpu
) {
684 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
686 if ((void *)addr
>= start
&&
687 (void *)addr
< start
+ mod
->percpu_size
) {
698 #else /* ... !CONFIG_SMP */
700 static inline void __percpu
*mod_percpu(struct module
*mod
)
704 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
706 /* UP modules shouldn't have this section: ENOMEM isn't quite right */
707 if (info
->sechdrs
[info
->index
.pcpu
].sh_size
!= 0)
711 static inline void percpu_modfree(struct module
*mod
)
714 static unsigned int find_pcpusec(struct load_info
*info
)
718 static inline void percpu_modcopy(struct module
*mod
,
719 const void *from
, unsigned long size
)
721 /* pcpusec should be 0, and size of that section should be 0. */
724 bool is_module_percpu_address(unsigned long addr
)
729 #endif /* CONFIG_SMP */
731 #define MODINFO_ATTR(field) \
732 static void setup_modinfo_##field(struct module *mod, const char *s) \
734 mod->field = kstrdup(s, GFP_KERNEL); \
736 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
737 struct module_kobject *mk, char *buffer) \
739 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
741 static int modinfo_##field##_exists(struct module *mod) \
743 return mod->field != NULL; \
745 static void free_modinfo_##field(struct module *mod) \
750 static struct module_attribute modinfo_##field = { \
751 .attr = { .name = __stringify(field), .mode = 0444 }, \
752 .show = show_modinfo_##field, \
753 .setup = setup_modinfo_##field, \
754 .test = modinfo_##field##_exists, \
755 .free = free_modinfo_##field, \
758 MODINFO_ATTR(version
);
759 MODINFO_ATTR(srcversion
);
761 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
763 #ifdef CONFIG_MODULE_UNLOAD
765 EXPORT_TRACEPOINT_SYMBOL(module_get
);
767 /* MODULE_REF_BASE is the base reference count by kmodule loader. */
768 #define MODULE_REF_BASE 1
770 /* Init the unload section of the module. */
771 static int module_unload_init(struct module
*mod
)
774 * Initialize reference counter to MODULE_REF_BASE.
775 * refcnt == 0 means module is going.
777 atomic_set(&mod
->refcnt
, MODULE_REF_BASE
);
779 INIT_LIST_HEAD(&mod
->source_list
);
780 INIT_LIST_HEAD(&mod
->target_list
);
782 /* Hold reference count during initialization. */
783 atomic_inc(&mod
->refcnt
);
788 /* Does a already use b? */
789 static int already_uses(struct module
*a
, struct module
*b
)
791 struct module_use
*use
;
793 list_for_each_entry(use
, &b
->source_list
, source_list
) {
794 if (use
->source
== a
) {
795 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
799 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
805 * - we add 'a' as a "source", 'b' as a "target" of module use
806 * - the module_use is added to the list of 'b' sources (so
807 * 'b' can walk the list to see who sourced them), and of 'a'
808 * targets (so 'a' can see what modules it targets).
810 static int add_module_usage(struct module
*a
, struct module
*b
)
812 struct module_use
*use
;
814 pr_debug("Allocating new usage for %s.\n", a
->name
);
815 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
817 pr_warn("%s: out of memory loading\n", a
->name
);
823 list_add(&use
->source_list
, &b
->source_list
);
824 list_add(&use
->target_list
, &a
->target_list
);
828 /* Module a uses b: caller needs module_mutex() */
829 int ref_module(struct module
*a
, struct module
*b
)
833 if (b
== NULL
|| already_uses(a
, b
))
836 /* If module isn't available, we fail. */
837 err
= strong_try_module_get(b
);
841 err
= add_module_usage(a
, b
);
848 EXPORT_SYMBOL_GPL(ref_module
);
850 /* Clear the unload stuff of the module. */
851 static void module_unload_free(struct module
*mod
)
853 struct module_use
*use
, *tmp
;
855 mutex_lock(&module_mutex
);
856 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
857 struct module
*i
= use
->target
;
858 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
860 list_del(&use
->source_list
);
861 list_del(&use
->target_list
);
864 mutex_unlock(&module_mutex
);
867 #ifdef CONFIG_MODULE_FORCE_UNLOAD
868 static inline int try_force_unload(unsigned int flags
)
870 int ret
= (flags
& O_TRUNC
);
872 add_taint(TAINT_FORCED_RMMOD
, LOCKDEP_NOW_UNRELIABLE
);
876 static inline int try_force_unload(unsigned int flags
)
880 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
882 /* Try to release refcount of module, 0 means success. */
883 static int try_release_module_ref(struct module
*mod
)
887 /* Try to decrement refcnt which we set at loading */
888 ret
= atomic_sub_return(MODULE_REF_BASE
, &mod
->refcnt
);
891 /* Someone can put this right now, recover with checking */
892 ret
= atomic_add_unless(&mod
->refcnt
, MODULE_REF_BASE
, 0);
897 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
899 /* If it's not unused, quit unless we're forcing. */
900 if (try_release_module_ref(mod
) != 0) {
901 *forced
= try_force_unload(flags
);
906 /* Mark it as dying. */
907 mod
->state
= MODULE_STATE_GOING
;
913 * module_refcount - return the refcount or -1 if unloading
915 * @mod: the module we're checking
918 * -1 if the module is in the process of unloading
919 * otherwise the number of references in the kernel to the module
921 int module_refcount(struct module
*mod
)
923 return atomic_read(&mod
->refcnt
) - MODULE_REF_BASE
;
925 EXPORT_SYMBOL(module_refcount
);
927 /* This exists whether we can unload or not */
928 static void free_module(struct module
*mod
);
930 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
934 char name
[MODULE_NAME_LEN
];
937 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
940 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
942 name
[MODULE_NAME_LEN
-1] = '\0';
944 if (mutex_lock_interruptible(&module_mutex
) != 0)
947 mod
= find_module(name
);
953 if (!list_empty(&mod
->source_list
)) {
954 /* Other modules depend on us: get rid of them first. */
959 /* Doing init or already dying? */
960 if (mod
->state
!= MODULE_STATE_LIVE
) {
961 /* FIXME: if (force), slam module count damn the torpedoes */
962 pr_debug("%s already dying\n", mod
->name
);
967 /* If it has an init func, it must have an exit func to unload */
968 if (mod
->init
&& !mod
->exit
) {
969 forced
= try_force_unload(flags
);
971 /* This module can't be removed */
977 /* Stop the machine so refcounts can't move and disable module. */
978 ret
= try_stop_module(mod
, flags
, &forced
);
982 mutex_unlock(&module_mutex
);
983 /* Final destruction now no one is using it. */
984 if (mod
->exit
!= NULL
)
986 blocking_notifier_call_chain(&module_notify_list
,
987 MODULE_STATE_GOING
, mod
);
988 klp_module_going(mod
);
989 ftrace_release_mod(mod
);
991 async_synchronize_full();
993 /* Store the name of the last unloaded module for diagnostic purposes */
994 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
999 mutex_unlock(&module_mutex
);
1003 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1005 struct module_use
*use
;
1006 int printed_something
= 0;
1008 seq_printf(m
, " %i ", module_refcount(mod
));
1011 * Always include a trailing , so userspace can differentiate
1012 * between this and the old multi-field proc format.
1014 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
1015 printed_something
= 1;
1016 seq_printf(m
, "%s,", use
->source
->name
);
1019 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
1020 printed_something
= 1;
1021 seq_puts(m
, "[permanent],");
1024 if (!printed_something
)
1028 void __symbol_put(const char *symbol
)
1030 struct module
*owner
;
1033 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
1038 EXPORT_SYMBOL(__symbol_put
);
1040 /* Note this assumes addr is a function, which it currently always is. */
1041 void symbol_put_addr(void *addr
)
1043 struct module
*modaddr
;
1044 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
1046 if (core_kernel_text(a
))
1050 * Even though we hold a reference on the module; we still need to
1051 * disable preemption in order to safely traverse the data structure.
1054 modaddr
= __module_text_address(a
);
1056 module_put(modaddr
);
1059 EXPORT_SYMBOL_GPL(symbol_put_addr
);
1061 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
1062 struct module_kobject
*mk
, char *buffer
)
1064 return sprintf(buffer
, "%i\n", module_refcount(mk
->mod
));
1067 static struct module_attribute modinfo_refcnt
=
1068 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
1070 void __module_get(struct module
*module
)
1074 atomic_inc(&module
->refcnt
);
1075 trace_module_get(module
, _RET_IP_
);
1079 EXPORT_SYMBOL(__module_get
);
1081 bool try_module_get(struct module
*module
)
1087 /* Note: here, we can fail to get a reference */
1088 if (likely(module_is_live(module
) &&
1089 atomic_inc_not_zero(&module
->refcnt
) != 0))
1090 trace_module_get(module
, _RET_IP_
);
1098 EXPORT_SYMBOL(try_module_get
);
1100 void module_put(struct module
*module
)
1106 ret
= atomic_dec_if_positive(&module
->refcnt
);
1107 WARN_ON(ret
< 0); /* Failed to put refcount */
1108 trace_module_put(module
, _RET_IP_
);
1112 EXPORT_SYMBOL(module_put
);
1114 #else /* !CONFIG_MODULE_UNLOAD */
1115 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1117 /* We don't know the usage count, or what modules are using. */
1118 seq_puts(m
, " - -");
1121 static inline void module_unload_free(struct module
*mod
)
1125 int ref_module(struct module
*a
, struct module
*b
)
1127 return strong_try_module_get(b
);
1129 EXPORT_SYMBOL_GPL(ref_module
);
1131 static inline int module_unload_init(struct module
*mod
)
1135 #endif /* CONFIG_MODULE_UNLOAD */
1137 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1141 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1143 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1145 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1147 if (mod
->taints
& (1 << TAINT_CRAP
))
1149 if (mod
->taints
& (1 << TAINT_UNSIGNED_MODULE
))
1152 * TAINT_FORCED_RMMOD: could be added.
1153 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1159 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1160 struct module_kobject
*mk
, char *buffer
)
1162 const char *state
= "unknown";
1164 switch (mk
->mod
->state
) {
1165 case MODULE_STATE_LIVE
:
1168 case MODULE_STATE_COMING
:
1171 case MODULE_STATE_GOING
:
1177 return sprintf(buffer
, "%s\n", state
);
1180 static struct module_attribute modinfo_initstate
=
1181 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1183 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1184 struct module_kobject
*mk
,
1185 const char *buffer
, size_t count
)
1187 enum kobject_action action
;
1189 if (kobject_action_type(buffer
, count
, &action
) == 0)
1190 kobject_uevent(&mk
->kobj
, action
);
1194 struct module_attribute module_uevent
=
1195 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1197 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1198 struct module_kobject
*mk
, char *buffer
)
1200 return sprintf(buffer
, "%u\n", mk
->mod
->core_layout
.size
);
1203 static struct module_attribute modinfo_coresize
=
1204 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1206 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1207 struct module_kobject
*mk
, char *buffer
)
1209 return sprintf(buffer
, "%u\n", mk
->mod
->init_layout
.size
);
1212 static struct module_attribute modinfo_initsize
=
1213 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1215 static ssize_t
show_taint(struct module_attribute
*mattr
,
1216 struct module_kobject
*mk
, char *buffer
)
1220 l
= module_flags_taint(mk
->mod
, buffer
);
1225 static struct module_attribute modinfo_taint
=
1226 __ATTR(taint
, 0444, show_taint
, NULL
);
1228 static struct module_attribute
*modinfo_attrs
[] = {
1231 &modinfo_srcversion
,
1236 #ifdef CONFIG_MODULE_UNLOAD
1242 static const char vermagic
[] = VERMAGIC_STRING
;
1244 static int try_to_force_load(struct module
*mod
, const char *reason
)
1246 #ifdef CONFIG_MODULE_FORCE_LOAD
1247 if (!test_taint(TAINT_FORCED_MODULE
))
1248 pr_warn("%s: %s: kernel tainted.\n", mod
->name
, reason
);
1249 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
1256 #ifdef CONFIG_MODVERSIONS
1257 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1258 static unsigned long maybe_relocated(unsigned long crc
,
1259 const struct module
*crc_owner
)
1261 #ifdef ARCH_RELOCATES_KCRCTAB
1262 if (crc_owner
== NULL
)
1263 return crc
- (unsigned long)reloc_start
;
1268 static int check_version(Elf_Shdr
*sechdrs
,
1269 unsigned int versindex
,
1270 const char *symname
,
1272 const unsigned long *crc
,
1273 const struct module
*crc_owner
)
1275 unsigned int i
, num_versions
;
1276 struct modversion_info
*versions
;
1278 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1282 /* No versions at all? modprobe --force does this. */
1284 return try_to_force_load(mod
, symname
) == 0;
1286 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1287 num_versions
= sechdrs
[versindex
].sh_size
1288 / sizeof(struct modversion_info
);
1290 for (i
= 0; i
< num_versions
; i
++) {
1291 if (strcmp(versions
[i
].name
, symname
) != 0)
1294 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1296 pr_debug("Found checksum %lX vs module %lX\n",
1297 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1301 pr_warn("%s: no symbol version for %s\n", mod
->name
, symname
);
1305 pr_warn("%s: disagrees about version of symbol %s\n",
1306 mod
->name
, symname
);
1310 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1311 unsigned int versindex
,
1314 const unsigned long *crc
;
1317 * Since this should be found in kernel (which can't be removed), no
1318 * locking is necessary -- use preempt_disable() to placate lockdep.
1321 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout
), NULL
,
1322 &crc
, true, false)) {
1327 return check_version(sechdrs
, versindex
,
1328 VMLINUX_SYMBOL_STR(module_layout
), mod
, crc
,
1332 /* First part is kernel version, which we ignore if module has crcs. */
1333 static inline int same_magic(const char *amagic
, const char *bmagic
,
1337 amagic
+= strcspn(amagic
, " ");
1338 bmagic
+= strcspn(bmagic
, " ");
1340 return strcmp(amagic
, bmagic
) == 0;
1343 static inline int check_version(Elf_Shdr
*sechdrs
,
1344 unsigned int versindex
,
1345 const char *symname
,
1347 const unsigned long *crc
,
1348 const struct module
*crc_owner
)
1353 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1354 unsigned int versindex
,
1360 static inline int same_magic(const char *amagic
, const char *bmagic
,
1363 return strcmp(amagic
, bmagic
) == 0;
1365 #endif /* CONFIG_MODVERSIONS */
1367 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1368 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1369 const struct load_info
*info
,
1373 struct module
*owner
;
1374 const struct kernel_symbol
*sym
;
1375 const unsigned long *crc
;
1379 * The module_mutex should not be a heavily contended lock;
1380 * if we get the occasional sleep here, we'll go an extra iteration
1381 * in the wait_event_interruptible(), which is harmless.
1383 sched_annotate_sleep();
1384 mutex_lock(&module_mutex
);
1385 sym
= find_symbol(name
, &owner
, &crc
,
1386 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1390 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1392 sym
= ERR_PTR(-EINVAL
);
1396 err
= ref_module(mod
, owner
);
1403 /* We must make copy under the lock if we failed to get ref. */
1404 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1406 mutex_unlock(&module_mutex
);
1410 static const struct kernel_symbol
*
1411 resolve_symbol_wait(struct module
*mod
,
1412 const struct load_info
*info
,
1415 const struct kernel_symbol
*ksym
;
1416 char owner
[MODULE_NAME_LEN
];
1418 if (wait_event_interruptible_timeout(module_wq
,
1419 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1420 || PTR_ERR(ksym
) != -EBUSY
,
1422 pr_warn("%s: gave up waiting for init of module %s.\n",
1429 * /sys/module/foo/sections stuff
1430 * J. Corbet <corbet@lwn.net>
1434 #ifdef CONFIG_KALLSYMS
1435 static inline bool sect_empty(const Elf_Shdr
*sect
)
1437 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1440 struct module_sect_attr
{
1441 struct module_attribute mattr
;
1443 unsigned long address
;
1446 struct module_sect_attrs
{
1447 struct attribute_group grp
;
1448 unsigned int nsections
;
1449 struct module_sect_attr attrs
[0];
1452 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1453 struct module_kobject
*mk
, char *buf
)
1455 struct module_sect_attr
*sattr
=
1456 container_of(mattr
, struct module_sect_attr
, mattr
);
1457 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1460 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1462 unsigned int section
;
1464 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1465 kfree(sect_attrs
->attrs
[section
].name
);
1469 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1471 unsigned int nloaded
= 0, i
, size
[2];
1472 struct module_sect_attrs
*sect_attrs
;
1473 struct module_sect_attr
*sattr
;
1474 struct attribute
**gattr
;
1476 /* Count loaded sections and allocate structures */
1477 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1478 if (!sect_empty(&info
->sechdrs
[i
]))
1480 size
[0] = ALIGN(sizeof(*sect_attrs
)
1481 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1482 sizeof(sect_attrs
->grp
.attrs
[0]));
1483 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1484 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1485 if (sect_attrs
== NULL
)
1488 /* Setup section attributes. */
1489 sect_attrs
->grp
.name
= "sections";
1490 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1492 sect_attrs
->nsections
= 0;
1493 sattr
= §_attrs
->attrs
[0];
1494 gattr
= §_attrs
->grp
.attrs
[0];
1495 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1496 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1497 if (sect_empty(sec
))
1499 sattr
->address
= sec
->sh_addr
;
1500 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1502 if (sattr
->name
== NULL
)
1504 sect_attrs
->nsections
++;
1505 sysfs_attr_init(&sattr
->mattr
.attr
);
1506 sattr
->mattr
.show
= module_sect_show
;
1507 sattr
->mattr
.store
= NULL
;
1508 sattr
->mattr
.attr
.name
= sattr
->name
;
1509 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1510 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1514 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1517 mod
->sect_attrs
= sect_attrs
;
1520 free_sect_attrs(sect_attrs
);
1523 static void remove_sect_attrs(struct module
*mod
)
1525 if (mod
->sect_attrs
) {
1526 sysfs_remove_group(&mod
->mkobj
.kobj
,
1527 &mod
->sect_attrs
->grp
);
1528 /* We are positive that no one is using any sect attrs
1529 * at this point. Deallocate immediately. */
1530 free_sect_attrs(mod
->sect_attrs
);
1531 mod
->sect_attrs
= NULL
;
1536 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1539 struct module_notes_attrs
{
1540 struct kobject
*dir
;
1542 struct bin_attribute attrs
[0];
1545 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1546 struct bin_attribute
*bin_attr
,
1547 char *buf
, loff_t pos
, size_t count
)
1550 * The caller checked the pos and count against our size.
1552 memcpy(buf
, bin_attr
->private + pos
, count
);
1556 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1559 if (notes_attrs
->dir
) {
1561 sysfs_remove_bin_file(notes_attrs
->dir
,
1562 ¬es_attrs
->attrs
[i
]);
1563 kobject_put(notes_attrs
->dir
);
1568 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1570 unsigned int notes
, loaded
, i
;
1571 struct module_notes_attrs
*notes_attrs
;
1572 struct bin_attribute
*nattr
;
1574 /* failed to create section attributes, so can't create notes */
1575 if (!mod
->sect_attrs
)
1578 /* Count notes sections and allocate structures. */
1580 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1581 if (!sect_empty(&info
->sechdrs
[i
]) &&
1582 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1588 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1589 + notes
* sizeof(notes_attrs
->attrs
[0]),
1591 if (notes_attrs
== NULL
)
1594 notes_attrs
->notes
= notes
;
1595 nattr
= ¬es_attrs
->attrs
[0];
1596 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1597 if (sect_empty(&info
->sechdrs
[i
]))
1599 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1600 sysfs_bin_attr_init(nattr
);
1601 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1602 nattr
->attr
.mode
= S_IRUGO
;
1603 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1604 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1605 nattr
->read
= module_notes_read
;
1611 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1612 if (!notes_attrs
->dir
)
1615 for (i
= 0; i
< notes
; ++i
)
1616 if (sysfs_create_bin_file(notes_attrs
->dir
,
1617 ¬es_attrs
->attrs
[i
]))
1620 mod
->notes_attrs
= notes_attrs
;
1624 free_notes_attrs(notes_attrs
, i
);
1627 static void remove_notes_attrs(struct module
*mod
)
1629 if (mod
->notes_attrs
)
1630 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1635 static inline void add_sect_attrs(struct module
*mod
,
1636 const struct load_info
*info
)
1640 static inline void remove_sect_attrs(struct module
*mod
)
1644 static inline void add_notes_attrs(struct module
*mod
,
1645 const struct load_info
*info
)
1649 static inline void remove_notes_attrs(struct module
*mod
)
1652 #endif /* CONFIG_KALLSYMS */
1654 static void add_usage_links(struct module
*mod
)
1656 #ifdef CONFIG_MODULE_UNLOAD
1657 struct module_use
*use
;
1660 mutex_lock(&module_mutex
);
1661 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1662 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1663 &mod
->mkobj
.kobj
, mod
->name
);
1665 mutex_unlock(&module_mutex
);
1669 static void del_usage_links(struct module
*mod
)
1671 #ifdef CONFIG_MODULE_UNLOAD
1672 struct module_use
*use
;
1674 mutex_lock(&module_mutex
);
1675 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1676 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1677 mutex_unlock(&module_mutex
);
1681 static int module_add_modinfo_attrs(struct module
*mod
)
1683 struct module_attribute
*attr
;
1684 struct module_attribute
*temp_attr
;
1688 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1689 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1691 if (!mod
->modinfo_attrs
)
1694 temp_attr
= mod
->modinfo_attrs
;
1695 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1696 if (!attr
->test
|| attr
->test(mod
)) {
1697 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1698 sysfs_attr_init(&temp_attr
->attr
);
1699 error
= sysfs_create_file(&mod
->mkobj
.kobj
,
1707 static void module_remove_modinfo_attrs(struct module
*mod
)
1709 struct module_attribute
*attr
;
1712 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1713 /* pick a field to test for end of list */
1714 if (!attr
->attr
.name
)
1716 sysfs_remove_file(&mod
->mkobj
.kobj
, &attr
->attr
);
1720 kfree(mod
->modinfo_attrs
);
1723 static void mod_kobject_put(struct module
*mod
)
1725 DECLARE_COMPLETION_ONSTACK(c
);
1726 mod
->mkobj
.kobj_completion
= &c
;
1727 kobject_put(&mod
->mkobj
.kobj
);
1728 wait_for_completion(&c
);
1731 static int mod_sysfs_init(struct module
*mod
)
1734 struct kobject
*kobj
;
1736 if (!module_sysfs_initialized
) {
1737 pr_err("%s: module sysfs not initialized\n", mod
->name
);
1742 kobj
= kset_find_obj(module_kset
, mod
->name
);
1744 pr_err("%s: module is already loaded\n", mod
->name
);
1750 mod
->mkobj
.mod
= mod
;
1752 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1753 mod
->mkobj
.kobj
.kset
= module_kset
;
1754 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1757 mod_kobject_put(mod
);
1759 /* delay uevent until full sysfs population */
1764 static int mod_sysfs_setup(struct module
*mod
,
1765 const struct load_info
*info
,
1766 struct kernel_param
*kparam
,
1767 unsigned int num_params
)
1771 err
= mod_sysfs_init(mod
);
1775 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1776 if (!mod
->holders_dir
) {
1781 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1783 goto out_unreg_holders
;
1785 err
= module_add_modinfo_attrs(mod
);
1787 goto out_unreg_param
;
1789 add_usage_links(mod
);
1790 add_sect_attrs(mod
, info
);
1791 add_notes_attrs(mod
, info
);
1793 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1797 module_param_sysfs_remove(mod
);
1799 kobject_put(mod
->holders_dir
);
1801 mod_kobject_put(mod
);
1806 static void mod_sysfs_fini(struct module
*mod
)
1808 remove_notes_attrs(mod
);
1809 remove_sect_attrs(mod
);
1810 mod_kobject_put(mod
);
1813 static void init_param_lock(struct module
*mod
)
1815 mutex_init(&mod
->param_lock
);
1817 #else /* !CONFIG_SYSFS */
1819 static int mod_sysfs_setup(struct module
*mod
,
1820 const struct load_info
*info
,
1821 struct kernel_param
*kparam
,
1822 unsigned int num_params
)
1827 static void mod_sysfs_fini(struct module
*mod
)
1831 static void module_remove_modinfo_attrs(struct module
*mod
)
1835 static void del_usage_links(struct module
*mod
)
1839 static void init_param_lock(struct module
*mod
)
1842 #endif /* CONFIG_SYSFS */
1844 static void mod_sysfs_teardown(struct module
*mod
)
1846 del_usage_links(mod
);
1847 module_remove_modinfo_attrs(mod
);
1848 module_param_sysfs_remove(mod
);
1849 kobject_put(mod
->mkobj
.drivers_dir
);
1850 kobject_put(mod
->holders_dir
);
1851 mod_sysfs_fini(mod
);
1854 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1856 * LKM RO/NX protection: protect module's text/ro-data
1857 * from modification and any data from execution.
1859 * General layout of module is:
1860 * [text] [read-only-data] [writable data]
1861 * text_size -----^ ^ ^
1862 * ro_size ------------------------| |
1863 * size -------------------------------------------|
1865 * These values are always page-aligned (as is base)
1867 static void frob_text(const struct module_layout
*layout
,
1868 int (*set_memory
)(unsigned long start
, int num_pages
))
1870 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1871 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1872 set_memory((unsigned long)layout
->base
,
1873 layout
->text_size
>> PAGE_SHIFT
);
1876 static void frob_rodata(const struct module_layout
*layout
,
1877 int (*set_memory
)(unsigned long start
, int num_pages
))
1879 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1880 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1881 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1882 set_memory((unsigned long)layout
->base
+ layout
->text_size
,
1883 (layout
->ro_size
- layout
->text_size
) >> PAGE_SHIFT
);
1886 static void frob_writable_data(const struct module_layout
*layout
,
1887 int (*set_memory
)(unsigned long start
, int num_pages
))
1889 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1890 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1891 BUG_ON((unsigned long)layout
->size
& (PAGE_SIZE
-1));
1892 set_memory((unsigned long)layout
->base
+ layout
->ro_size
,
1893 (layout
->size
- layout
->ro_size
) >> PAGE_SHIFT
);
1896 /* livepatching wants to disable read-only so it can frob module. */
1897 void module_disable_ro(const struct module
*mod
)
1899 frob_text(&mod
->core_layout
, set_memory_rw
);
1900 frob_rodata(&mod
->core_layout
, set_memory_rw
);
1901 frob_text(&mod
->init_layout
, set_memory_rw
);
1902 frob_rodata(&mod
->init_layout
, set_memory_rw
);
1905 void module_enable_ro(const struct module
*mod
)
1907 frob_text(&mod
->core_layout
, set_memory_ro
);
1908 frob_rodata(&mod
->core_layout
, set_memory_ro
);
1909 frob_text(&mod
->init_layout
, set_memory_ro
);
1910 frob_rodata(&mod
->init_layout
, set_memory_ro
);
1913 static void module_enable_nx(const struct module
*mod
)
1915 frob_rodata(&mod
->core_layout
, set_memory_nx
);
1916 frob_writable_data(&mod
->core_layout
, set_memory_nx
);
1917 frob_rodata(&mod
->init_layout
, set_memory_nx
);
1918 frob_writable_data(&mod
->init_layout
, set_memory_nx
);
1921 static void module_disable_nx(const struct module
*mod
)
1923 frob_rodata(&mod
->core_layout
, set_memory_x
);
1924 frob_writable_data(&mod
->core_layout
, set_memory_x
);
1925 frob_rodata(&mod
->init_layout
, set_memory_x
);
1926 frob_writable_data(&mod
->init_layout
, set_memory_x
);
1929 /* Iterate through all modules and set each module's text as RW */
1930 void set_all_modules_text_rw(void)
1934 mutex_lock(&module_mutex
);
1935 list_for_each_entry_rcu(mod
, &modules
, list
) {
1936 if (mod
->state
== MODULE_STATE_UNFORMED
)
1939 frob_text(&mod
->core_layout
, set_memory_rw
);
1940 frob_text(&mod
->init_layout
, set_memory_rw
);
1942 mutex_unlock(&module_mutex
);
1945 /* Iterate through all modules and set each module's text as RO */
1946 void set_all_modules_text_ro(void)
1950 mutex_lock(&module_mutex
);
1951 list_for_each_entry_rcu(mod
, &modules
, list
) {
1952 if (mod
->state
== MODULE_STATE_UNFORMED
)
1955 frob_text(&mod
->core_layout
, set_memory_ro
);
1956 frob_text(&mod
->init_layout
, set_memory_ro
);
1958 mutex_unlock(&module_mutex
);
1961 static void disable_ro_nx(const struct module_layout
*layout
)
1963 frob_text(layout
, set_memory_rw
);
1964 frob_rodata(layout
, set_memory_rw
);
1965 frob_rodata(layout
, set_memory_x
);
1966 frob_writable_data(layout
, set_memory_x
);
1970 static void disable_ro_nx(const struct module_layout
*layout
) { }
1971 static void module_enable_nx(const struct module
*mod
) { }
1972 static void module_disable_nx(const struct module
*mod
) { }
1975 #ifdef CONFIG_LIVEPATCH
1977 * Persist Elf information about a module. Copy the Elf header,
1978 * section header table, section string table, and symtab section
1979 * index from info to mod->klp_info.
1981 static int copy_module_elf(struct module
*mod
, struct load_info
*info
)
1983 unsigned int size
, symndx
;
1986 size
= sizeof(*mod
->klp_info
);
1987 mod
->klp_info
= kmalloc(size
, GFP_KERNEL
);
1988 if (mod
->klp_info
== NULL
)
1992 size
= sizeof(mod
->klp_info
->hdr
);
1993 memcpy(&mod
->klp_info
->hdr
, info
->hdr
, size
);
1995 /* Elf section header table */
1996 size
= sizeof(*info
->sechdrs
) * info
->hdr
->e_shnum
;
1997 mod
->klp_info
->sechdrs
= kmalloc(size
, GFP_KERNEL
);
1998 if (mod
->klp_info
->sechdrs
== NULL
) {
2002 memcpy(mod
->klp_info
->sechdrs
, info
->sechdrs
, size
);
2004 /* Elf section name string table */
2005 size
= info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_size
;
2006 mod
->klp_info
->secstrings
= kmalloc(size
, GFP_KERNEL
);
2007 if (mod
->klp_info
->secstrings
== NULL
) {
2011 memcpy(mod
->klp_info
->secstrings
, info
->secstrings
, size
);
2013 /* Elf symbol section index */
2014 symndx
= info
->index
.sym
;
2015 mod
->klp_info
->symndx
= symndx
;
2018 * For livepatch modules, core_kallsyms.symtab is a complete
2019 * copy of the original symbol table. Adjust sh_addr to point
2020 * to core_kallsyms.symtab since the copy of the symtab in module
2021 * init memory is freed at the end of do_init_module().
2023 mod
->klp_info
->sechdrs
[symndx
].sh_addr
= \
2024 (unsigned long) mod
->core_kallsyms
.symtab
;
2029 kfree(mod
->klp_info
->sechdrs
);
2031 kfree(mod
->klp_info
);
2035 static void free_module_elf(struct module
*mod
)
2037 kfree(mod
->klp_info
->sechdrs
);
2038 kfree(mod
->klp_info
->secstrings
);
2039 kfree(mod
->klp_info
);
2041 #else /* !CONFIG_LIVEPATCH */
2042 static int copy_module_elf(struct module
*mod
, struct load_info
*info
)
2047 static void free_module_elf(struct module
*mod
)
2050 #endif /* CONFIG_LIVEPATCH */
2052 void __weak
module_memfree(void *module_region
)
2054 vfree(module_region
);
2057 void __weak
module_arch_cleanup(struct module
*mod
)
2061 void __weak
module_arch_freeing_init(struct module
*mod
)
2065 /* Free a module, remove from lists, etc. */
2066 static void free_module(struct module
*mod
)
2068 trace_module_free(mod
);
2070 mod_sysfs_teardown(mod
);
2072 /* We leave it in list to prevent duplicate loads, but make sure
2073 * that noone uses it while it's being deconstructed. */
2074 mutex_lock(&module_mutex
);
2075 mod
->state
= MODULE_STATE_UNFORMED
;
2076 mutex_unlock(&module_mutex
);
2078 /* Remove dynamic debug info */
2079 ddebug_remove_module(mod
->name
);
2081 /* Arch-specific cleanup. */
2082 module_arch_cleanup(mod
);
2084 /* Module unload stuff */
2085 module_unload_free(mod
);
2087 /* Free any allocated parameters. */
2088 destroy_params(mod
->kp
, mod
->num_kp
);
2090 if (is_livepatch_module(mod
))
2091 free_module_elf(mod
);
2093 /* Now we can delete it from the lists */
2094 mutex_lock(&module_mutex
);
2095 /* Unlink carefully: kallsyms could be walking list. */
2096 list_del_rcu(&mod
->list
);
2097 mod_tree_remove(mod
);
2098 /* Remove this module from bug list, this uses list_del_rcu */
2099 module_bug_cleanup(mod
);
2100 /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */
2101 synchronize_sched();
2102 mutex_unlock(&module_mutex
);
2104 /* This may be empty, but that's OK */
2105 disable_ro_nx(&mod
->init_layout
);
2106 module_arch_freeing_init(mod
);
2107 module_memfree(mod
->init_layout
.base
);
2109 percpu_modfree(mod
);
2111 /* Free lock-classes; relies on the preceding sync_rcu(). */
2112 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
2114 /* Finally, free the core (containing the module structure) */
2115 disable_ro_nx(&mod
->core_layout
);
2116 module_memfree(mod
->core_layout
.base
);
2119 update_protections(current
->mm
);
2123 void *__symbol_get(const char *symbol
)
2125 struct module
*owner
;
2126 const struct kernel_symbol
*sym
;
2129 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
2130 if (sym
&& strong_try_module_get(owner
))
2134 return sym
? (void *)sym
->value
: NULL
;
2136 EXPORT_SYMBOL_GPL(__symbol_get
);
2139 * Ensure that an exported symbol [global namespace] does not already exist
2140 * in the kernel or in some other module's exported symbol table.
2142 * You must hold the module_mutex.
2144 static int verify_export_symbols(struct module
*mod
)
2147 struct module
*owner
;
2148 const struct kernel_symbol
*s
;
2150 const struct kernel_symbol
*sym
;
2153 { mod
->syms
, mod
->num_syms
},
2154 { mod
->gpl_syms
, mod
->num_gpl_syms
},
2155 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
2156 #ifdef CONFIG_UNUSED_SYMBOLS
2157 { mod
->unused_syms
, mod
->num_unused_syms
},
2158 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
2162 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
2163 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
2164 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
2165 pr_err("%s: exports duplicate symbol %s"
2167 mod
->name
, s
->name
, module_name(owner
));
2175 /* Change all symbols so that st_value encodes the pointer directly. */
2176 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
2178 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2179 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
2180 unsigned long secbase
;
2183 const struct kernel_symbol
*ksym
;
2185 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
2186 const char *name
= info
->strtab
+ sym
[i
].st_name
;
2188 switch (sym
[i
].st_shndx
) {
2190 /* Ignore common symbols */
2191 if (!strncmp(name
, "__gnu_lto", 9))
2194 /* We compiled with -fno-common. These are not
2195 supposed to happen. */
2196 pr_debug("Common symbol: %s\n", name
);
2197 pr_warn("%s: please compile with -fno-common\n",
2203 /* Don't need to do anything */
2204 pr_debug("Absolute symbol: 0x%08lx\n",
2205 (long)sym
[i
].st_value
);
2209 /* Livepatch symbols are resolved by livepatch */
2213 ksym
= resolve_symbol_wait(mod
, info
, name
);
2214 /* Ok if resolved. */
2215 if (ksym
&& !IS_ERR(ksym
)) {
2216 sym
[i
].st_value
= ksym
->value
;
2221 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
2224 pr_warn("%s: Unknown symbol %s (err %li)\n",
2225 mod
->name
, name
, PTR_ERR(ksym
));
2226 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
2230 /* Divert to percpu allocation if a percpu var. */
2231 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
2232 secbase
= (unsigned long)mod_percpu(mod
);
2234 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
2235 sym
[i
].st_value
+= secbase
;
2243 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
2248 /* Now do relocations. */
2249 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2250 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2252 /* Not a valid relocation section? */
2253 if (infosec
>= info
->hdr
->e_shnum
)
2256 /* Don't bother with non-allocated sections */
2257 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2260 /* Livepatch relocation sections are applied by livepatch */
2261 if (info
->sechdrs
[i
].sh_flags
& SHF_RELA_LIVEPATCH
)
2264 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2265 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2266 info
->index
.sym
, i
, mod
);
2267 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2268 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2269 info
->index
.sym
, i
, mod
);
2276 /* Additional bytes needed by arch in front of individual sections */
2277 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2278 unsigned int section
)
2280 /* default implementation just returns zero */
2284 /* Update size with this section: return offset. */
2285 static long get_offset(struct module
*mod
, unsigned int *size
,
2286 Elf_Shdr
*sechdr
, unsigned int section
)
2290 *size
+= arch_mod_section_prepend(mod
, section
);
2291 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2292 *size
= ret
+ sechdr
->sh_size
;
2296 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2297 might -- code, read-only data, read-write data, small data. Tally
2298 sizes, and place the offsets into sh_entsize fields: high bit means it
2300 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2302 static unsigned long const masks
[][2] = {
2303 /* NOTE: all executable code must be the first section
2304 * in this array; otherwise modify the text_size
2305 * finder in the two loops below */
2306 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2307 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2308 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2309 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2313 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2314 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2316 pr_debug("Core section allocation order:\n");
2317 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2318 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2319 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2320 const char *sname
= info
->secstrings
+ s
->sh_name
;
2322 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2323 || (s
->sh_flags
& masks
[m
][1])
2324 || s
->sh_entsize
!= ~0UL
2325 || strstarts(sname
, ".init"))
2327 s
->sh_entsize
= get_offset(mod
, &mod
->core_layout
.size
, s
, i
);
2328 pr_debug("\t%s\n", sname
);
2331 case 0: /* executable */
2332 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2333 mod
->core_layout
.text_size
= mod
->core_layout
.size
;
2335 case 1: /* RO: text and ro-data */
2336 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2337 mod
->core_layout
.ro_size
= mod
->core_layout
.size
;
2339 case 3: /* whole core */
2340 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2345 pr_debug("Init section allocation order:\n");
2346 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2347 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2348 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2349 const char *sname
= info
->secstrings
+ s
->sh_name
;
2351 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2352 || (s
->sh_flags
& masks
[m
][1])
2353 || s
->sh_entsize
!= ~0UL
2354 || !strstarts(sname
, ".init"))
2356 s
->sh_entsize
= (get_offset(mod
, &mod
->init_layout
.size
, s
, i
)
2357 | INIT_OFFSET_MASK
);
2358 pr_debug("\t%s\n", sname
);
2361 case 0: /* executable */
2362 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2363 mod
->init_layout
.text_size
= mod
->init_layout
.size
;
2365 case 1: /* RO: text and ro-data */
2366 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2367 mod
->init_layout
.ro_size
= mod
->init_layout
.size
;
2369 case 3: /* whole init */
2370 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2376 static void set_license(struct module
*mod
, const char *license
)
2379 license
= "unspecified";
2381 if (!license_is_gpl_compatible(license
)) {
2382 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2383 pr_warn("%s: module license '%s' taints kernel.\n",
2384 mod
->name
, license
);
2385 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2386 LOCKDEP_NOW_UNRELIABLE
);
2390 /* Parse tag=value strings from .modinfo section */
2391 static char *next_string(char *string
, unsigned long *secsize
)
2393 /* Skip non-zero chars */
2396 if ((*secsize
)-- <= 1)
2400 /* Skip any zero padding. */
2401 while (!string
[0]) {
2403 if ((*secsize
)-- <= 1)
2409 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2412 unsigned int taglen
= strlen(tag
);
2413 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2414 unsigned long size
= infosec
->sh_size
;
2416 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2417 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2418 return p
+ taglen
+ 1;
2423 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2425 struct module_attribute
*attr
;
2428 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2430 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2434 static void free_modinfo(struct module
*mod
)
2436 struct module_attribute
*attr
;
2439 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2445 #ifdef CONFIG_KALLSYMS
2447 /* lookup symbol in given range of kernel_symbols */
2448 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2449 const struct kernel_symbol
*start
,
2450 const struct kernel_symbol
*stop
)
2452 return bsearch(name
, start
, stop
- start
,
2453 sizeof(struct kernel_symbol
), cmp_name
);
2456 static int is_exported(const char *name
, unsigned long value
,
2457 const struct module
*mod
)
2459 const struct kernel_symbol
*ks
;
2461 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2463 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2464 return ks
!= NULL
&& ks
->value
== value
;
2468 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2470 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2472 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2473 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2478 if (sym
->st_shndx
== SHN_UNDEF
)
2480 if (sym
->st_shndx
== SHN_ABS
|| sym
->st_shndx
== info
->index
.pcpu
)
2482 if (sym
->st_shndx
>= SHN_LORESERVE
)
2484 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2486 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2487 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2488 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2490 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2495 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2496 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2501 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2508 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2509 unsigned int shnum
, unsigned int pcpundx
)
2511 const Elf_Shdr
*sec
;
2513 if (src
->st_shndx
== SHN_UNDEF
2514 || src
->st_shndx
>= shnum
2518 #ifdef CONFIG_KALLSYMS_ALL
2519 if (src
->st_shndx
== pcpundx
)
2523 sec
= sechdrs
+ src
->st_shndx
;
2524 if (!(sec
->sh_flags
& SHF_ALLOC
)
2525 #ifndef CONFIG_KALLSYMS_ALL
2526 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2528 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2535 * We only allocate and copy the strings needed by the parts of symtab
2536 * we keep. This is simple, but has the effect of making multiple
2537 * copies of duplicates. We could be more sophisticated, see
2538 * linux-kernel thread starting with
2539 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2541 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2543 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2544 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2546 unsigned int i
, nsrc
, ndst
, strtab_size
= 0;
2548 /* Put symbol section at end of init part of module. */
2549 symsect
->sh_flags
|= SHF_ALLOC
;
2550 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, symsect
,
2551 info
->index
.sym
) | INIT_OFFSET_MASK
;
2552 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2554 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2555 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2557 /* Compute total space required for the core symbols' strtab. */
2558 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2559 if (i
== 0 || is_livepatch_module(mod
) ||
2560 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2561 info
->index
.pcpu
)) {
2562 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2567 /* Append room for core symbols at end of core part. */
2568 info
->symoffs
= ALIGN(mod
->core_layout
.size
, symsect
->sh_addralign
?: 1);
2569 info
->stroffs
= mod
->core_layout
.size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2570 mod
->core_layout
.size
+= strtab_size
;
2571 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2573 /* Put string table section at end of init part of module. */
2574 strsect
->sh_flags
|= SHF_ALLOC
;
2575 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, strsect
,
2576 info
->index
.str
) | INIT_OFFSET_MASK
;
2577 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2579 /* We'll tack temporary mod_kallsyms on the end. */
2580 mod
->init_layout
.size
= ALIGN(mod
->init_layout
.size
,
2581 __alignof__(struct mod_kallsyms
));
2582 info
->mod_kallsyms_init_off
= mod
->init_layout
.size
;
2583 mod
->init_layout
.size
+= sizeof(struct mod_kallsyms
);
2584 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2588 * We use the full symtab and strtab which layout_symtab arranged to
2589 * be appended to the init section. Later we switch to the cut-down
2592 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2594 unsigned int i
, ndst
;
2598 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2600 /* Set up to point into init section. */
2601 mod
->kallsyms
= mod
->init_layout
.base
+ info
->mod_kallsyms_init_off
;
2603 mod
->kallsyms
->symtab
= (void *)symsec
->sh_addr
;
2604 mod
->kallsyms
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2605 /* Make sure we get permanent strtab: don't use info->strtab. */
2606 mod
->kallsyms
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2608 /* Set types up while we still have access to sections. */
2609 for (i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++)
2610 mod
->kallsyms
->symtab
[i
].st_info
2611 = elf_type(&mod
->kallsyms
->symtab
[i
], info
);
2613 /* Now populate the cut down core kallsyms for after init. */
2614 mod
->core_kallsyms
.symtab
= dst
= mod
->core_layout
.base
+ info
->symoffs
;
2615 mod
->core_kallsyms
.strtab
= s
= mod
->core_layout
.base
+ info
->stroffs
;
2616 src
= mod
->kallsyms
->symtab
;
2617 for (ndst
= i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++) {
2618 if (i
== 0 || is_livepatch_module(mod
) ||
2619 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2620 info
->index
.pcpu
)) {
2622 dst
[ndst
++].st_name
= s
- mod
->core_kallsyms
.strtab
;
2623 s
+= strlcpy(s
, &mod
->kallsyms
->strtab
[src
[i
].st_name
],
2627 mod
->core_kallsyms
.num_symtab
= ndst
;
2630 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2634 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2637 #endif /* CONFIG_KALLSYMS */
2639 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2643 #ifdef CONFIG_DYNAMIC_DEBUG
2644 if (ddebug_add_module(debug
, num
, debug
->modname
))
2645 pr_err("dynamic debug error adding module: %s\n",
2650 static void dynamic_debug_remove(struct _ddebug
*debug
)
2653 ddebug_remove_module(debug
->modname
);
2656 void * __weak
module_alloc(unsigned long size
)
2658 return vmalloc_exec(size
);
2661 #ifdef CONFIG_DEBUG_KMEMLEAK
2662 static void kmemleak_load_module(const struct module
*mod
,
2663 const struct load_info
*info
)
2667 /* only scan the sections containing data */
2668 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2670 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2671 /* Scan all writable sections that's not executable */
2672 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
2673 !(info
->sechdrs
[i
].sh_flags
& SHF_WRITE
) ||
2674 (info
->sechdrs
[i
].sh_flags
& SHF_EXECINSTR
))
2677 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2678 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2682 static inline void kmemleak_load_module(const struct module
*mod
,
2683 const struct load_info
*info
)
2688 #ifdef CONFIG_MODULE_SIG
2689 static int module_sig_check(struct load_info
*info
)
2692 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2693 const void *mod
= info
->hdr
;
2695 if (info
->len
> markerlen
&&
2696 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2697 /* We truncate the module to discard the signature */
2698 info
->len
-= markerlen
;
2699 err
= mod_verify_sig(mod
, &info
->len
);
2703 info
->sig_ok
= true;
2707 /* Not having a signature is only an error if we're strict. */
2708 if (err
== -ENOKEY
&& !sig_enforce
)
2713 #else /* !CONFIG_MODULE_SIG */
2714 static int module_sig_check(struct load_info
*info
)
2718 #endif /* !CONFIG_MODULE_SIG */
2720 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2721 static int elf_header_check(struct load_info
*info
)
2723 if (info
->len
< sizeof(*(info
->hdr
)))
2726 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2727 || info
->hdr
->e_type
!= ET_REL
2728 || !elf_check_arch(info
->hdr
)
2729 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2732 if (info
->hdr
->e_shoff
>= info
->len
2733 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2734 info
->len
- info
->hdr
->e_shoff
))
2740 #define COPY_CHUNK_SIZE (16*PAGE_SIZE)
2742 static int copy_chunked_from_user(void *dst
, const void __user
*usrc
, unsigned long len
)
2745 unsigned long n
= min(len
, COPY_CHUNK_SIZE
);
2747 if (copy_from_user(dst
, usrc
, n
) != 0)
2757 #ifdef CONFIG_LIVEPATCH
2758 static int find_livepatch_modinfo(struct module
*mod
, struct load_info
*info
)
2760 mod
->klp
= get_modinfo(info
, "livepatch") ? true : false;
2764 #else /* !CONFIG_LIVEPATCH */
2765 static int find_livepatch_modinfo(struct module
*mod
, struct load_info
*info
)
2767 if (get_modinfo(info
, "livepatch")) {
2768 pr_err("%s: module is marked as livepatch module, but livepatch support is disabled",
2775 #endif /* CONFIG_LIVEPATCH */
2777 /* Sets info->hdr and info->len. */
2778 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2779 struct load_info
*info
)
2784 if (info
->len
< sizeof(*(info
->hdr
)))
2787 err
= security_kernel_read_file(NULL
, READING_MODULE
);
2791 /* Suck in entire file: we'll want most of it. */
2792 info
->hdr
= __vmalloc(info
->len
,
2793 GFP_KERNEL
| __GFP_HIGHMEM
| __GFP_NOWARN
, PAGE_KERNEL
);
2797 if (copy_chunked_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2805 static void free_copy(struct load_info
*info
)
2810 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2814 /* This should always be true, but let's be sure. */
2815 info
->sechdrs
[0].sh_addr
= 0;
2817 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2818 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2819 if (shdr
->sh_type
!= SHT_NOBITS
2820 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2821 pr_err("Module len %lu truncated\n", info
->len
);
2825 /* Mark all sections sh_addr with their address in the
2827 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2829 #ifndef CONFIG_MODULE_UNLOAD
2830 /* Don't load .exit sections */
2831 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2832 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2836 /* Track but don't keep modinfo and version sections. */
2837 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2838 info
->index
.vers
= 0; /* Pretend no __versions section! */
2840 info
->index
.vers
= find_sec(info
, "__versions");
2841 info
->index
.info
= find_sec(info
, ".modinfo");
2842 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2843 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2848 * Set up our basic convenience variables (pointers to section headers,
2849 * search for module section index etc), and do some basic section
2852 * Return the temporary module pointer (we'll replace it with the final
2853 * one when we move the module sections around).
2855 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2861 /* Set up the convenience variables */
2862 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2863 info
->secstrings
= (void *)info
->hdr
2864 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2866 err
= rewrite_section_headers(info
, flags
);
2868 return ERR_PTR(err
);
2870 /* Find internal symbols and strings. */
2871 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2872 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2873 info
->index
.sym
= i
;
2874 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2875 info
->strtab
= (char *)info
->hdr
2876 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2881 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2882 if (!info
->index
.mod
) {
2883 pr_warn("No module found in object\n");
2884 return ERR_PTR(-ENOEXEC
);
2886 /* This is temporary: point mod into copy of data. */
2887 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2889 if (info
->index
.sym
== 0) {
2890 pr_warn("%s: module has no symbols (stripped?)\n", mod
->name
);
2891 return ERR_PTR(-ENOEXEC
);
2894 info
->index
.pcpu
= find_pcpusec(info
);
2896 /* Check module struct version now, before we try to use module. */
2897 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2898 return ERR_PTR(-ENOEXEC
);
2903 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2905 const char *modmagic
= get_modinfo(info
, "vermagic");
2908 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2911 /* This is allowed: modprobe --force will invalidate it. */
2913 err
= try_to_force_load(mod
, "bad vermagic");
2916 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2917 pr_err("%s: version magic '%s' should be '%s'\n",
2918 mod
->name
, modmagic
, vermagic
);
2922 if (!get_modinfo(info
, "intree")) {
2923 if (!test_taint(TAINT_OOT_MODULE
))
2924 pr_warn("%s: loading out-of-tree module taints kernel.\n",
2926 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2929 if (get_modinfo(info
, "staging")) {
2930 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2931 pr_warn("%s: module is from the staging directory, the quality "
2932 "is unknown, you have been warned.\n", mod
->name
);
2935 err
= find_livepatch_modinfo(mod
, info
);
2939 /* Set up license info based on the info section */
2940 set_license(mod
, get_modinfo(info
, "license"));
2945 static int find_module_sections(struct module
*mod
, struct load_info
*info
)
2947 mod
->kp
= section_objs(info
, "__param",
2948 sizeof(*mod
->kp
), &mod
->num_kp
);
2949 mod
->syms
= section_objs(info
, "__ksymtab",
2950 sizeof(*mod
->syms
), &mod
->num_syms
);
2951 mod
->crcs
= section_addr(info
, "__kcrctab");
2952 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2953 sizeof(*mod
->gpl_syms
),
2954 &mod
->num_gpl_syms
);
2955 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2956 mod
->gpl_future_syms
= section_objs(info
,
2957 "__ksymtab_gpl_future",
2958 sizeof(*mod
->gpl_future_syms
),
2959 &mod
->num_gpl_future_syms
);
2960 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2962 #ifdef CONFIG_UNUSED_SYMBOLS
2963 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2964 sizeof(*mod
->unused_syms
),
2965 &mod
->num_unused_syms
);
2966 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2967 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2968 sizeof(*mod
->unused_gpl_syms
),
2969 &mod
->num_unused_gpl_syms
);
2970 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2972 #ifdef CONFIG_CONSTRUCTORS
2973 mod
->ctors
= section_objs(info
, ".ctors",
2974 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2976 mod
->ctors
= section_objs(info
, ".init_array",
2977 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2978 else if (find_sec(info
, ".init_array")) {
2980 * This shouldn't happen with same compiler and binutils
2981 * building all parts of the module.
2983 pr_warn("%s: has both .ctors and .init_array.\n",
2989 #ifdef CONFIG_TRACEPOINTS
2990 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2991 sizeof(*mod
->tracepoints_ptrs
),
2992 &mod
->num_tracepoints
);
2994 #ifdef HAVE_JUMP_LABEL
2995 mod
->jump_entries
= section_objs(info
, "__jump_table",
2996 sizeof(*mod
->jump_entries
),
2997 &mod
->num_jump_entries
);
2999 #ifdef CONFIG_EVENT_TRACING
3000 mod
->trace_events
= section_objs(info
, "_ftrace_events",
3001 sizeof(*mod
->trace_events
),
3002 &mod
->num_trace_events
);
3003 mod
->trace_enums
= section_objs(info
, "_ftrace_enum_map",
3004 sizeof(*mod
->trace_enums
),
3005 &mod
->num_trace_enums
);
3007 #ifdef CONFIG_TRACING
3008 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
3009 sizeof(*mod
->trace_bprintk_fmt_start
),
3010 &mod
->num_trace_bprintk_fmt
);
3012 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
3013 /* sechdrs[0].sh_size is always zero */
3014 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
3015 sizeof(*mod
->ftrace_callsites
),
3016 &mod
->num_ftrace_callsites
);
3019 mod
->extable
= section_objs(info
, "__ex_table",
3020 sizeof(*mod
->extable
), &mod
->num_exentries
);
3022 if (section_addr(info
, "__obsparm"))
3023 pr_warn("%s: Ignoring obsolete parameters\n", mod
->name
);
3025 info
->debug
= section_objs(info
, "__verbose",
3026 sizeof(*info
->debug
), &info
->num_debug
);
3031 static int move_module(struct module
*mod
, struct load_info
*info
)
3036 /* Do the allocs. */
3037 ptr
= module_alloc(mod
->core_layout
.size
);
3039 * The pointer to this block is stored in the module structure
3040 * which is inside the block. Just mark it as not being a
3043 kmemleak_not_leak(ptr
);
3047 memset(ptr
, 0, mod
->core_layout
.size
);
3048 mod
->core_layout
.base
= ptr
;
3050 if (mod
->init_layout
.size
) {
3051 ptr
= module_alloc(mod
->init_layout
.size
);
3053 * The pointer to this block is stored in the module structure
3054 * which is inside the block. This block doesn't need to be
3055 * scanned as it contains data and code that will be freed
3056 * after the module is initialized.
3058 kmemleak_ignore(ptr
);
3060 module_memfree(mod
->core_layout
.base
);
3063 memset(ptr
, 0, mod
->init_layout
.size
);
3064 mod
->init_layout
.base
= ptr
;
3066 mod
->init_layout
.base
= NULL
;
3068 /* Transfer each section which specifies SHF_ALLOC */
3069 pr_debug("final section addresses:\n");
3070 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
3072 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
3074 if (!(shdr
->sh_flags
& SHF_ALLOC
))
3077 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
3078 dest
= mod
->init_layout
.base
3079 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
3081 dest
= mod
->core_layout
.base
+ shdr
->sh_entsize
;
3083 if (shdr
->sh_type
!= SHT_NOBITS
)
3084 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
3085 /* Update sh_addr to point to copy in image. */
3086 shdr
->sh_addr
= (unsigned long)dest
;
3087 pr_debug("\t0x%lx %s\n",
3088 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
3094 static int check_module_license_and_versions(struct module
*mod
)
3096 int prev_taint
= test_taint(TAINT_PROPRIETARY_MODULE
);
3099 * ndiswrapper is under GPL by itself, but loads proprietary modules.
3100 * Don't use add_taint_module(), as it would prevent ndiswrapper from
3101 * using GPL-only symbols it needs.
3103 if (strcmp(mod
->name
, "ndiswrapper") == 0)
3104 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
3106 /* driverloader was caught wrongly pretending to be under GPL */
3107 if (strcmp(mod
->name
, "driverloader") == 0)
3108 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3109 LOCKDEP_NOW_UNRELIABLE
);
3111 /* lve claims to be GPL but upstream won't provide source */
3112 if (strcmp(mod
->name
, "lve") == 0)
3113 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3114 LOCKDEP_NOW_UNRELIABLE
);
3116 if (!prev_taint
&& test_taint(TAINT_PROPRIETARY_MODULE
))
3117 pr_warn("%s: module license taints kernel.\n", mod
->name
);
3119 #ifdef CONFIG_MODVERSIONS
3120 if ((mod
->num_syms
&& !mod
->crcs
)
3121 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
3122 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
3123 #ifdef CONFIG_UNUSED_SYMBOLS
3124 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
3125 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
3128 return try_to_force_load(mod
,
3129 "no versions for exported symbols");
3135 static void flush_module_icache(const struct module
*mod
)
3137 mm_segment_t old_fs
;
3139 /* flush the icache in correct context */
3144 * Flush the instruction cache, since we've played with text.
3145 * Do it before processing of module parameters, so the module
3146 * can provide parameter accessor functions of its own.
3148 if (mod
->init_layout
.base
)
3149 flush_icache_range((unsigned long)mod
->init_layout
.base
,
3150 (unsigned long)mod
->init_layout
.base
3151 + mod
->init_layout
.size
);
3152 flush_icache_range((unsigned long)mod
->core_layout
.base
,
3153 (unsigned long)mod
->core_layout
.base
+ mod
->core_layout
.size
);
3158 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
3166 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
3168 /* Module within temporary copy. */
3172 mod
= setup_load_info(info
, flags
);
3176 err
= check_modinfo(mod
, info
, flags
);
3178 return ERR_PTR(err
);
3180 /* Allow arches to frob section contents and sizes. */
3181 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
3182 info
->secstrings
, mod
);
3184 return ERR_PTR(err
);
3186 /* We will do a special allocation for per-cpu sections later. */
3187 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
3189 /* Determine total sizes, and put offsets in sh_entsize. For now
3190 this is done generically; there doesn't appear to be any
3191 special cases for the architectures. */
3192 layout_sections(mod
, info
);
3193 layout_symtab(mod
, info
);
3195 /* Allocate and move to the final place */
3196 err
= move_module(mod
, info
);
3198 return ERR_PTR(err
);
3200 /* Module has been copied to its final place now: return it. */
3201 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
3202 kmemleak_load_module(mod
, info
);
3206 /* mod is no longer valid after this! */
3207 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
3209 percpu_modfree(mod
);
3210 module_arch_freeing_init(mod
);
3211 module_memfree(mod
->init_layout
.base
);
3212 module_memfree(mod
->core_layout
.base
);
3215 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
3216 const Elf_Shdr
*sechdrs
,
3222 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
3224 /* Sort exception table now relocations are done. */
3225 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
3227 /* Copy relocated percpu area over. */
3228 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
3229 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
3231 /* Setup kallsyms-specific fields. */
3232 add_kallsyms(mod
, info
);
3234 /* Arch-specific module finalizing. */
3235 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3238 /* Is this module of this name done loading? No locks held. */
3239 static bool finished_loading(const char *name
)
3245 * The module_mutex should not be a heavily contended lock;
3246 * if we get the occasional sleep here, we'll go an extra iteration
3247 * in the wait_event_interruptible(), which is harmless.
3249 sched_annotate_sleep();
3250 mutex_lock(&module_mutex
);
3251 mod
= find_module_all(name
, strlen(name
), true);
3252 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3253 || mod
->state
== MODULE_STATE_GOING
;
3254 mutex_unlock(&module_mutex
);
3259 /* Call module constructors. */
3260 static void do_mod_ctors(struct module
*mod
)
3262 #ifdef CONFIG_CONSTRUCTORS
3265 for (i
= 0; i
< mod
->num_ctors
; i
++)
3270 /* For freeing module_init on success, in case kallsyms traversing */
3271 struct mod_initfree
{
3272 struct rcu_head rcu
;
3276 static void do_free_init(struct rcu_head
*head
)
3278 struct mod_initfree
*m
= container_of(head
, struct mod_initfree
, rcu
);
3279 module_memfree(m
->module_init
);
3284 * This is where the real work happens.
3286 * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
3287 * helper command 'lx-symbols'.
3289 static noinline
int do_init_module(struct module
*mod
)
3292 struct mod_initfree
*freeinit
;
3294 freeinit
= kmalloc(sizeof(*freeinit
), GFP_KERNEL
);
3299 freeinit
->module_init
= mod
->init_layout
.base
;
3302 * We want to find out whether @mod uses async during init. Clear
3303 * PF_USED_ASYNC. async_schedule*() will set it.
3305 current
->flags
&= ~PF_USED_ASYNC
;
3308 /* Start the module */
3309 if (mod
->init
!= NULL
)
3310 ret
= do_one_initcall(mod
->init
);
3312 goto fail_free_freeinit
;
3315 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3316 "follow 0/-E convention\n"
3317 "%s: loading module anyway...\n",
3318 __func__
, mod
->name
, ret
, __func__
);
3322 /* Now it's a first class citizen! */
3323 mod
->state
= MODULE_STATE_LIVE
;
3324 blocking_notifier_call_chain(&module_notify_list
,
3325 MODULE_STATE_LIVE
, mod
);
3328 * We need to finish all async code before the module init sequence
3329 * is done. This has potential to deadlock. For example, a newly
3330 * detected block device can trigger request_module() of the
3331 * default iosched from async probing task. Once userland helper
3332 * reaches here, async_synchronize_full() will wait on the async
3333 * task waiting on request_module() and deadlock.
3335 * This deadlock is avoided by perfomring async_synchronize_full()
3336 * iff module init queued any async jobs. This isn't a full
3337 * solution as it will deadlock the same if module loading from
3338 * async jobs nests more than once; however, due to the various
3339 * constraints, this hack seems to be the best option for now.
3340 * Please refer to the following thread for details.
3342 * http://thread.gmane.org/gmane.linux.kernel/1420814
3344 if (!mod
->async_probe_requested
&& (current
->flags
& PF_USED_ASYNC
))
3345 async_synchronize_full();
3347 mutex_lock(&module_mutex
);
3348 /* Drop initial reference. */
3350 trim_init_extable(mod
);
3351 #ifdef CONFIG_KALLSYMS
3352 /* Switch to core kallsyms now init is done: kallsyms may be walking! */
3353 rcu_assign_pointer(mod
->kallsyms
, &mod
->core_kallsyms
);
3355 mod_tree_remove_init(mod
);
3356 disable_ro_nx(&mod
->init_layout
);
3357 module_arch_freeing_init(mod
);
3358 mod
->init_layout
.base
= NULL
;
3359 mod
->init_layout
.size
= 0;
3360 mod
->init_layout
.ro_size
= 0;
3361 mod
->init_layout
.text_size
= 0;
3363 * We want to free module_init, but be aware that kallsyms may be
3364 * walking this with preempt disabled. In all the failure paths, we
3365 * call synchronize_sched(), but we don't want to slow down the success
3366 * path, so use actual RCU here.
3368 call_rcu_sched(&freeinit
->rcu
, do_free_init
);
3369 mutex_unlock(&module_mutex
);
3370 wake_up_all(&module_wq
);
3377 /* Try to protect us from buggy refcounters. */
3378 mod
->state
= MODULE_STATE_GOING
;
3379 synchronize_sched();
3381 blocking_notifier_call_chain(&module_notify_list
,
3382 MODULE_STATE_GOING
, mod
);
3383 klp_module_going(mod
);
3384 ftrace_release_mod(mod
);
3386 wake_up_all(&module_wq
);
3390 static int may_init_module(void)
3392 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3399 * We try to place it in the list now to make sure it's unique before
3400 * we dedicate too many resources. In particular, temporary percpu
3401 * memory exhaustion.
3403 static int add_unformed_module(struct module
*mod
)
3408 mod
->state
= MODULE_STATE_UNFORMED
;
3411 mutex_lock(&module_mutex
);
3412 old
= find_module_all(mod
->name
, strlen(mod
->name
), true);
3414 if (old
->state
== MODULE_STATE_COMING
3415 || old
->state
== MODULE_STATE_UNFORMED
) {
3416 /* Wait in case it fails to load. */
3417 mutex_unlock(&module_mutex
);
3418 err
= wait_event_interruptible(module_wq
,
3419 finished_loading(mod
->name
));
3427 mod_update_bounds(mod
);
3428 list_add_rcu(&mod
->list
, &modules
);
3429 mod_tree_insert(mod
);
3433 mutex_unlock(&module_mutex
);
3438 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3442 mutex_lock(&module_mutex
);
3444 /* Find duplicate symbols (must be called under lock). */
3445 err
= verify_export_symbols(mod
);
3449 /* This relies on module_mutex for list integrity. */
3450 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3452 /* Set RO and NX regions */
3453 module_enable_ro(mod
);
3454 module_enable_nx(mod
);
3456 /* Mark state as coming so strong_try_module_get() ignores us,
3457 * but kallsyms etc. can see us. */
3458 mod
->state
= MODULE_STATE_COMING
;
3459 mutex_unlock(&module_mutex
);
3464 mutex_unlock(&module_mutex
);
3468 static int prepare_coming_module(struct module
*mod
)
3472 ftrace_module_enable(mod
);
3473 err
= klp_module_coming(mod
);
3477 blocking_notifier_call_chain(&module_notify_list
,
3478 MODULE_STATE_COMING
, mod
);
3482 static int unknown_module_param_cb(char *param
, char *val
, const char *modname
,
3485 struct module
*mod
= arg
;
3488 if (strcmp(param
, "async_probe") == 0) {
3489 mod
->async_probe_requested
= true;
3493 /* Check for magic 'dyndbg' arg */
3494 ret
= ddebug_dyndbg_module_param_cb(param
, val
, modname
);
3496 pr_warn("%s: unknown parameter '%s' ignored\n", modname
, param
);
3500 /* Allocate and load the module: note that size of section 0 is always
3501 zero, and we rely on this for optional sections. */
3502 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3509 err
= module_sig_check(info
);
3513 err
= elf_header_check(info
);
3517 /* Figure out module layout, and allocate all the memory. */
3518 mod
= layout_and_allocate(info
, flags
);
3524 /* Reserve our place in the list. */
3525 err
= add_unformed_module(mod
);
3529 #ifdef CONFIG_MODULE_SIG
3530 mod
->sig_ok
= info
->sig_ok
;
3532 pr_notice_once("%s: module verification failed: signature "
3533 "and/or required key missing - tainting "
3534 "kernel\n", mod
->name
);
3535 add_taint_module(mod
, TAINT_UNSIGNED_MODULE
, LOCKDEP_STILL_OK
);
3539 /* To avoid stressing percpu allocator, do this once we're unique. */
3540 err
= percpu_modalloc(mod
, info
);
3544 /* Now module is in final location, initialize linked lists, etc. */
3545 err
= module_unload_init(mod
);
3549 init_param_lock(mod
);
3551 /* Now we've got everything in the final locations, we can
3552 * find optional sections. */
3553 err
= find_module_sections(mod
, info
);
3557 err
= check_module_license_and_versions(mod
);
3561 /* Set up MODINFO_ATTR fields */
3562 setup_modinfo(mod
, info
);
3564 /* Fix up syms, so that st_value is a pointer to location. */
3565 err
= simplify_symbols(mod
, info
);
3569 err
= apply_relocations(mod
, info
);
3573 err
= post_relocation(mod
, info
);
3577 flush_module_icache(mod
);
3579 /* Now copy in args */
3580 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3581 if (IS_ERR(mod
->args
)) {
3582 err
= PTR_ERR(mod
->args
);
3583 goto free_arch_cleanup
;
3586 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3588 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3589 ftrace_module_init(mod
);
3591 /* Finally it's fully formed, ready to start executing. */
3592 err
= complete_formation(mod
, info
);
3594 goto ddebug_cleanup
;
3596 err
= prepare_coming_module(mod
);
3600 /* Module is ready to execute: parsing args may do that. */
3601 after_dashes
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3603 unknown_module_param_cb
);
3604 if (IS_ERR(after_dashes
)) {
3605 err
= PTR_ERR(after_dashes
);
3606 goto coming_cleanup
;
3607 } else if (after_dashes
) {
3608 pr_warn("%s: parameters '%s' after `--' ignored\n",
3609 mod
->name
, after_dashes
);
3612 /* Link in to syfs. */
3613 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3615 goto coming_cleanup
;
3617 if (is_livepatch_module(mod
)) {
3618 err
= copy_module_elf(mod
, info
);
3623 /* Get rid of temporary copy. */
3627 trace_module_load(mod
);
3629 return do_init_module(mod
);
3632 mod_sysfs_teardown(mod
);
3634 blocking_notifier_call_chain(&module_notify_list
,
3635 MODULE_STATE_GOING
, mod
);
3636 klp_module_going(mod
);
3638 /* module_bug_cleanup needs module_mutex protection */
3639 mutex_lock(&module_mutex
);
3640 module_bug_cleanup(mod
);
3641 mutex_unlock(&module_mutex
);
3643 /* we can't deallocate the module until we clear memory protection */
3644 module_disable_ro(mod
);
3645 module_disable_nx(mod
);
3648 dynamic_debug_remove(info
->debug
);
3649 synchronize_sched();
3652 module_arch_cleanup(mod
);
3656 module_unload_free(mod
);
3658 mutex_lock(&module_mutex
);
3659 /* Unlink carefully: kallsyms could be walking list. */
3660 list_del_rcu(&mod
->list
);
3661 mod_tree_remove(mod
);
3662 wake_up_all(&module_wq
);
3663 /* Wait for RCU-sched synchronizing before releasing mod->list. */
3664 synchronize_sched();
3665 mutex_unlock(&module_mutex
);
3668 * Ftrace needs to clean up what it initialized.
3669 * This does nothing if ftrace_module_init() wasn't called,
3670 * but it must be called outside of module_mutex.
3672 ftrace_release_mod(mod
);
3673 /* Free lock-classes; relies on the preceding sync_rcu() */
3674 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
3676 module_deallocate(mod
, info
);
3682 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3683 unsigned long, len
, const char __user
*, uargs
)
3686 struct load_info info
= { };
3688 err
= may_init_module();
3692 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3695 err
= copy_module_from_user(umod
, len
, &info
);
3699 return load_module(&info
, uargs
, 0);
3702 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3704 struct load_info info
= { };
3709 err
= may_init_module();
3713 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3715 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3716 |MODULE_INIT_IGNORE_VERMAGIC
))
3719 err
= kernel_read_file_from_fd(fd
, &hdr
, &size
, INT_MAX
,
3726 return load_module(&info
, uargs
, flags
);
3729 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3731 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3734 #ifdef CONFIG_KALLSYMS
3736 * This ignores the intensely annoying "mapping symbols" found
3737 * in ARM ELF files: $a, $t and $d.
3739 static inline int is_arm_mapping_symbol(const char *str
)
3741 if (str
[0] == '.' && str
[1] == 'L')
3743 return str
[0] == '$' && strchr("axtd", str
[1])
3744 && (str
[2] == '\0' || str
[2] == '.');
3747 static const char *symname(struct mod_kallsyms
*kallsyms
, unsigned int symnum
)
3749 return kallsyms
->strtab
+ kallsyms
->symtab
[symnum
].st_name
;
3752 static const char *get_ksymbol(struct module
*mod
,
3754 unsigned long *size
,
3755 unsigned long *offset
)
3757 unsigned int i
, best
= 0;
3758 unsigned long nextval
;
3759 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3761 /* At worse, next value is at end of module */
3762 if (within_module_init(addr
, mod
))
3763 nextval
= (unsigned long)mod
->init_layout
.base
+mod
->init_layout
.text_size
;
3765 nextval
= (unsigned long)mod
->core_layout
.base
+mod
->core_layout
.text_size
;
3767 /* Scan for closest preceding symbol, and next symbol. (ELF
3768 starts real symbols at 1). */
3769 for (i
= 1; i
< kallsyms
->num_symtab
; i
++) {
3770 if (kallsyms
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3773 /* We ignore unnamed symbols: they're uninformative
3774 * and inserted at a whim. */
3775 if (*symname(kallsyms
, i
) == '\0'
3776 || is_arm_mapping_symbol(symname(kallsyms
, i
)))
3779 if (kallsyms
->symtab
[i
].st_value
<= addr
3780 && kallsyms
->symtab
[i
].st_value
> kallsyms
->symtab
[best
].st_value
)
3782 if (kallsyms
->symtab
[i
].st_value
> addr
3783 && kallsyms
->symtab
[i
].st_value
< nextval
)
3784 nextval
= kallsyms
->symtab
[i
].st_value
;
3791 *size
= nextval
- kallsyms
->symtab
[best
].st_value
;
3793 *offset
= addr
- kallsyms
->symtab
[best
].st_value
;
3794 return symname(kallsyms
, best
);
3797 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3798 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3799 const char *module_address_lookup(unsigned long addr
,
3800 unsigned long *size
,
3801 unsigned long *offset
,
3805 const char *ret
= NULL
;
3809 mod
= __module_address(addr
);
3812 *modname
= mod
->name
;
3813 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3815 /* Make a copy in here where it's safe */
3817 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3825 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3830 list_for_each_entry_rcu(mod
, &modules
, list
) {
3831 if (mod
->state
== MODULE_STATE_UNFORMED
)
3833 if (within_module(addr
, mod
)) {
3836 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3839 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3849 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3850 unsigned long *offset
, char *modname
, char *name
)
3855 list_for_each_entry_rcu(mod
, &modules
, list
) {
3856 if (mod
->state
== MODULE_STATE_UNFORMED
)
3858 if (within_module(addr
, mod
)) {
3861 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3865 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3867 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3877 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3878 char *name
, char *module_name
, int *exported
)
3883 list_for_each_entry_rcu(mod
, &modules
, list
) {
3884 struct mod_kallsyms
*kallsyms
;
3886 if (mod
->state
== MODULE_STATE_UNFORMED
)
3888 kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3889 if (symnum
< kallsyms
->num_symtab
) {
3890 *value
= kallsyms
->symtab
[symnum
].st_value
;
3891 *type
= kallsyms
->symtab
[symnum
].st_info
;
3892 strlcpy(name
, symname(kallsyms
, symnum
), KSYM_NAME_LEN
);
3893 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3894 *exported
= is_exported(name
, *value
, mod
);
3898 symnum
-= kallsyms
->num_symtab
;
3904 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3907 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3909 for (i
= 0; i
< kallsyms
->num_symtab
; i
++)
3910 if (strcmp(name
, symname(kallsyms
, i
)) == 0 &&
3911 kallsyms
->symtab
[i
].st_info
!= 'U')
3912 return kallsyms
->symtab
[i
].st_value
;
3916 /* Look for this name: can be of form module:name. */
3917 unsigned long module_kallsyms_lookup_name(const char *name
)
3921 unsigned long ret
= 0;
3923 /* Don't lock: we're in enough trouble already. */
3925 if ((colon
= strchr(name
, ':')) != NULL
) {
3926 if ((mod
= find_module_all(name
, colon
- name
, false)) != NULL
)
3927 ret
= mod_find_symname(mod
, colon
+1);
3929 list_for_each_entry_rcu(mod
, &modules
, list
) {
3930 if (mod
->state
== MODULE_STATE_UNFORMED
)
3932 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3940 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3941 struct module
*, unsigned long),
3948 module_assert_mutex();
3950 list_for_each_entry(mod
, &modules
, list
) {
3951 /* We hold module_mutex: no need for rcu_dereference_sched */
3952 struct mod_kallsyms
*kallsyms
= mod
->kallsyms
;
3954 if (mod
->state
== MODULE_STATE_UNFORMED
)
3956 for (i
= 0; i
< kallsyms
->num_symtab
; i
++) {
3957 ret
= fn(data
, symname(kallsyms
, i
),
3958 mod
, kallsyms
->symtab
[i
].st_value
);
3965 #endif /* CONFIG_KALLSYMS */
3967 static char *module_flags(struct module
*mod
, char *buf
)
3971 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
3973 mod
->state
== MODULE_STATE_GOING
||
3974 mod
->state
== MODULE_STATE_COMING
) {
3976 bx
+= module_flags_taint(mod
, buf
+ bx
);
3977 /* Show a - for module-is-being-unloaded */
3978 if (mod
->state
== MODULE_STATE_GOING
)
3980 /* Show a + for module-is-being-loaded */
3981 if (mod
->state
== MODULE_STATE_COMING
)
3990 #ifdef CONFIG_PROC_FS
3991 /* Called by the /proc file system to return a list of modules. */
3992 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3994 mutex_lock(&module_mutex
);
3995 return seq_list_start(&modules
, *pos
);
3998 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
4000 return seq_list_next(p
, &modules
, pos
);
4003 static void m_stop(struct seq_file
*m
, void *p
)
4005 mutex_unlock(&module_mutex
);
4008 static int m_show(struct seq_file
*m
, void *p
)
4010 struct module
*mod
= list_entry(p
, struct module
, list
);
4013 /* We always ignore unformed modules. */
4014 if (mod
->state
== MODULE_STATE_UNFORMED
)
4017 seq_printf(m
, "%s %u",
4018 mod
->name
, mod
->init_layout
.size
+ mod
->core_layout
.size
);
4019 print_unload_info(m
, mod
);
4021 /* Informative for users. */
4022 seq_printf(m
, " %s",
4023 mod
->state
== MODULE_STATE_GOING
? "Unloading" :
4024 mod
->state
== MODULE_STATE_COMING
? "Loading" :
4026 /* Used by oprofile and other similar tools. */
4027 seq_printf(m
, " 0x%pK", mod
->core_layout
.base
);
4031 seq_printf(m
, " %s", module_flags(mod
, buf
));
4037 /* Format: modulename size refcount deps address
4039 Where refcount is a number or -, and deps is a comma-separated list
4042 static const struct seq_operations modules_op
= {
4049 static int modules_open(struct inode
*inode
, struct file
*file
)
4051 return seq_open(file
, &modules_op
);
4054 static const struct file_operations proc_modules_operations
= {
4055 .open
= modules_open
,
4057 .llseek
= seq_lseek
,
4058 .release
= seq_release
,
4061 static int __init
proc_modules_init(void)
4063 proc_create("modules", 0, NULL
, &proc_modules_operations
);
4066 module_init(proc_modules_init
);
4069 /* Given an address, look for it in the module exception tables. */
4070 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
4072 const struct exception_table_entry
*e
= NULL
;
4076 list_for_each_entry_rcu(mod
, &modules
, list
) {
4077 if (mod
->state
== MODULE_STATE_UNFORMED
)
4079 if (mod
->num_exentries
== 0)
4082 e
= search_extable(mod
->extable
,
4083 mod
->extable
+ mod
->num_exentries
- 1,
4090 /* Now, if we found one, we are running inside it now, hence
4091 we cannot unload the module, hence no refcnt needed. */
4096 * is_module_address - is this address inside a module?
4097 * @addr: the address to check.
4099 * See is_module_text_address() if you simply want to see if the address
4100 * is code (not data).
4102 bool is_module_address(unsigned long addr
)
4107 ret
= __module_address(addr
) != NULL
;
4114 * __module_address - get the module which contains an address.
4115 * @addr: the address.
4117 * Must be called with preempt disabled or module mutex held so that
4118 * module doesn't get freed during this.
4120 struct module
*__module_address(unsigned long addr
)
4124 if (addr
< module_addr_min
|| addr
> module_addr_max
)
4127 module_assert_mutex_or_preempt();
4129 mod
= mod_find(addr
);
4131 BUG_ON(!within_module(addr
, mod
));
4132 if (mod
->state
== MODULE_STATE_UNFORMED
)
4137 EXPORT_SYMBOL_GPL(__module_address
);
4140 * is_module_text_address - is this address inside module code?
4141 * @addr: the address to check.
4143 * See is_module_address() if you simply want to see if the address is
4144 * anywhere in a module. See kernel_text_address() for testing if an
4145 * address corresponds to kernel or module code.
4147 bool is_module_text_address(unsigned long addr
)
4152 ret
= __module_text_address(addr
) != NULL
;
4159 * __module_text_address - get the module whose code contains an address.
4160 * @addr: the address.
4162 * Must be called with preempt disabled or module mutex held so that
4163 * module doesn't get freed during this.
4165 struct module
*__module_text_address(unsigned long addr
)
4167 struct module
*mod
= __module_address(addr
);
4169 /* Make sure it's within the text section. */
4170 if (!within(addr
, mod
->init_layout
.base
, mod
->init_layout
.text_size
)
4171 && !within(addr
, mod
->core_layout
.base
, mod
->core_layout
.text_size
))
4176 EXPORT_SYMBOL_GPL(__module_text_address
);
4178 /* Don't grab lock, we're oopsing. */
4179 void print_modules(void)
4184 printk(KERN_DEFAULT
"Modules linked in:");
4185 /* Most callers should already have preempt disabled, but make sure */
4187 list_for_each_entry_rcu(mod
, &modules
, list
) {
4188 if (mod
->state
== MODULE_STATE_UNFORMED
)
4190 pr_cont(" %s%s", mod
->name
, module_flags(mod
, buf
));
4193 if (last_unloaded_module
[0])
4194 pr_cont(" [last unloaded: %s]", last_unloaded_module
);
4198 #ifdef CONFIG_MODVERSIONS
4199 /* Generate the signature for all relevant module structures here.
4200 * If these change, we don't want to try to parse the module. */
4201 void module_layout(struct module
*mod
,
4202 struct modversion_info
*ver
,
4203 struct kernel_param
*kp
,
4204 struct kernel_symbol
*ks
,
4205 struct tracepoint
* const *tp
)
4208 EXPORT_SYMBOL(module_layout
);