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
, int flags
)
2692 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2693 const void *mod
= info
->hdr
;
2696 * Require flags == 0, as a module with version information
2697 * removed is no longer the module that was signed
2700 info
->len
> markerlen
&&
2701 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2702 /* We truncate the module to discard the signature */
2703 info
->len
-= markerlen
;
2704 err
= mod_verify_sig(mod
, &info
->len
);
2708 info
->sig_ok
= true;
2712 /* Not having a signature is only an error if we're strict. */
2713 if (err
== -ENOKEY
&& !sig_enforce
)
2718 #else /* !CONFIG_MODULE_SIG */
2719 static int module_sig_check(struct load_info
*info
, int flags
)
2723 #endif /* !CONFIG_MODULE_SIG */
2725 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2726 static int elf_header_check(struct load_info
*info
)
2728 if (info
->len
< sizeof(*(info
->hdr
)))
2731 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2732 || info
->hdr
->e_type
!= ET_REL
2733 || !elf_check_arch(info
->hdr
)
2734 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2737 if (info
->hdr
->e_shoff
>= info
->len
2738 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2739 info
->len
- info
->hdr
->e_shoff
))
2745 #define COPY_CHUNK_SIZE (16*PAGE_SIZE)
2747 static int copy_chunked_from_user(void *dst
, const void __user
*usrc
, unsigned long len
)
2750 unsigned long n
= min(len
, COPY_CHUNK_SIZE
);
2752 if (copy_from_user(dst
, usrc
, n
) != 0)
2762 #ifdef CONFIG_LIVEPATCH
2763 static int find_livepatch_modinfo(struct module
*mod
, struct load_info
*info
)
2765 mod
->klp
= get_modinfo(info
, "livepatch") ? true : false;
2769 #else /* !CONFIG_LIVEPATCH */
2770 static int find_livepatch_modinfo(struct module
*mod
, struct load_info
*info
)
2772 if (get_modinfo(info
, "livepatch")) {
2773 pr_err("%s: module is marked as livepatch module, but livepatch support is disabled",
2780 #endif /* CONFIG_LIVEPATCH */
2782 /* Sets info->hdr and info->len. */
2783 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2784 struct load_info
*info
)
2789 if (info
->len
< sizeof(*(info
->hdr
)))
2792 err
= security_kernel_read_file(NULL
, READING_MODULE
);
2796 /* Suck in entire file: we'll want most of it. */
2797 info
->hdr
= __vmalloc(info
->len
,
2798 GFP_KERNEL
| __GFP_HIGHMEM
| __GFP_NOWARN
, PAGE_KERNEL
);
2802 if (copy_chunked_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2810 static void free_copy(struct load_info
*info
)
2815 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2819 /* This should always be true, but let's be sure. */
2820 info
->sechdrs
[0].sh_addr
= 0;
2822 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2823 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2824 if (shdr
->sh_type
!= SHT_NOBITS
2825 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2826 pr_err("Module len %lu truncated\n", info
->len
);
2830 /* Mark all sections sh_addr with their address in the
2832 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2834 #ifndef CONFIG_MODULE_UNLOAD
2835 /* Don't load .exit sections */
2836 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2837 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2841 /* Track but don't keep modinfo and version sections. */
2842 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2843 info
->index
.vers
= 0; /* Pretend no __versions section! */
2845 info
->index
.vers
= find_sec(info
, "__versions");
2846 info
->index
.info
= find_sec(info
, ".modinfo");
2847 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2848 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2853 * Set up our basic convenience variables (pointers to section headers,
2854 * search for module section index etc), and do some basic section
2857 * Return the temporary module pointer (we'll replace it with the final
2858 * one when we move the module sections around).
2860 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2866 /* Set up the convenience variables */
2867 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2868 info
->secstrings
= (void *)info
->hdr
2869 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2871 err
= rewrite_section_headers(info
, flags
);
2873 return ERR_PTR(err
);
2875 /* Find internal symbols and strings. */
2876 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2877 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2878 info
->index
.sym
= i
;
2879 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2880 info
->strtab
= (char *)info
->hdr
2881 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2886 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2887 if (!info
->index
.mod
) {
2888 pr_warn("No module found in object\n");
2889 return ERR_PTR(-ENOEXEC
);
2891 /* This is temporary: point mod into copy of data. */
2892 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2894 if (info
->index
.sym
== 0) {
2895 pr_warn("%s: module has no symbols (stripped?)\n", mod
->name
);
2896 return ERR_PTR(-ENOEXEC
);
2899 info
->index
.pcpu
= find_pcpusec(info
);
2901 /* Check module struct version now, before we try to use module. */
2902 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2903 return ERR_PTR(-ENOEXEC
);
2908 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2910 const char *modmagic
= get_modinfo(info
, "vermagic");
2913 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2916 /* This is allowed: modprobe --force will invalidate it. */
2918 err
= try_to_force_load(mod
, "bad vermagic");
2921 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2922 pr_err("%s: version magic '%s' should be '%s'\n",
2923 mod
->name
, modmagic
, vermagic
);
2927 if (!get_modinfo(info
, "intree")) {
2928 if (!test_taint(TAINT_OOT_MODULE
))
2929 pr_warn("%s: loading out-of-tree module taints kernel.\n",
2931 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2934 if (get_modinfo(info
, "staging")) {
2935 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2936 pr_warn("%s: module is from the staging directory, the quality "
2937 "is unknown, you have been warned.\n", mod
->name
);
2940 err
= find_livepatch_modinfo(mod
, info
);
2944 /* Set up license info based on the info section */
2945 set_license(mod
, get_modinfo(info
, "license"));
2950 static int find_module_sections(struct module
*mod
, struct load_info
*info
)
2952 mod
->kp
= section_objs(info
, "__param",
2953 sizeof(*mod
->kp
), &mod
->num_kp
);
2954 mod
->syms
= section_objs(info
, "__ksymtab",
2955 sizeof(*mod
->syms
), &mod
->num_syms
);
2956 mod
->crcs
= section_addr(info
, "__kcrctab");
2957 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2958 sizeof(*mod
->gpl_syms
),
2959 &mod
->num_gpl_syms
);
2960 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2961 mod
->gpl_future_syms
= section_objs(info
,
2962 "__ksymtab_gpl_future",
2963 sizeof(*mod
->gpl_future_syms
),
2964 &mod
->num_gpl_future_syms
);
2965 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2967 #ifdef CONFIG_UNUSED_SYMBOLS
2968 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2969 sizeof(*mod
->unused_syms
),
2970 &mod
->num_unused_syms
);
2971 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2972 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2973 sizeof(*mod
->unused_gpl_syms
),
2974 &mod
->num_unused_gpl_syms
);
2975 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2977 #ifdef CONFIG_CONSTRUCTORS
2978 mod
->ctors
= section_objs(info
, ".ctors",
2979 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2981 mod
->ctors
= section_objs(info
, ".init_array",
2982 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2983 else if (find_sec(info
, ".init_array")) {
2985 * This shouldn't happen with same compiler and binutils
2986 * building all parts of the module.
2988 pr_warn("%s: has both .ctors and .init_array.\n",
2994 #ifdef CONFIG_TRACEPOINTS
2995 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2996 sizeof(*mod
->tracepoints_ptrs
),
2997 &mod
->num_tracepoints
);
2999 #ifdef HAVE_JUMP_LABEL
3000 mod
->jump_entries
= section_objs(info
, "__jump_table",
3001 sizeof(*mod
->jump_entries
),
3002 &mod
->num_jump_entries
);
3004 #ifdef CONFIG_EVENT_TRACING
3005 mod
->trace_events
= section_objs(info
, "_ftrace_events",
3006 sizeof(*mod
->trace_events
),
3007 &mod
->num_trace_events
);
3008 mod
->trace_enums
= section_objs(info
, "_ftrace_enum_map",
3009 sizeof(*mod
->trace_enums
),
3010 &mod
->num_trace_enums
);
3012 #ifdef CONFIG_TRACING
3013 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
3014 sizeof(*mod
->trace_bprintk_fmt_start
),
3015 &mod
->num_trace_bprintk_fmt
);
3017 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
3018 /* sechdrs[0].sh_size is always zero */
3019 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
3020 sizeof(*mod
->ftrace_callsites
),
3021 &mod
->num_ftrace_callsites
);
3024 mod
->extable
= section_objs(info
, "__ex_table",
3025 sizeof(*mod
->extable
), &mod
->num_exentries
);
3027 if (section_addr(info
, "__obsparm"))
3028 pr_warn("%s: Ignoring obsolete parameters\n", mod
->name
);
3030 info
->debug
= section_objs(info
, "__verbose",
3031 sizeof(*info
->debug
), &info
->num_debug
);
3036 static int move_module(struct module
*mod
, struct load_info
*info
)
3041 /* Do the allocs. */
3042 ptr
= module_alloc(mod
->core_layout
.size
);
3044 * The pointer to this block is stored in the module structure
3045 * which is inside the block. Just mark it as not being a
3048 kmemleak_not_leak(ptr
);
3052 memset(ptr
, 0, mod
->core_layout
.size
);
3053 mod
->core_layout
.base
= ptr
;
3055 if (mod
->init_layout
.size
) {
3056 ptr
= module_alloc(mod
->init_layout
.size
);
3058 * The pointer to this block is stored in the module structure
3059 * which is inside the block. This block doesn't need to be
3060 * scanned as it contains data and code that will be freed
3061 * after the module is initialized.
3063 kmemleak_ignore(ptr
);
3065 module_memfree(mod
->core_layout
.base
);
3068 memset(ptr
, 0, mod
->init_layout
.size
);
3069 mod
->init_layout
.base
= ptr
;
3071 mod
->init_layout
.base
= NULL
;
3073 /* Transfer each section which specifies SHF_ALLOC */
3074 pr_debug("final section addresses:\n");
3075 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
3077 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
3079 if (!(shdr
->sh_flags
& SHF_ALLOC
))
3082 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
3083 dest
= mod
->init_layout
.base
3084 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
3086 dest
= mod
->core_layout
.base
+ shdr
->sh_entsize
;
3088 if (shdr
->sh_type
!= SHT_NOBITS
)
3089 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
3090 /* Update sh_addr to point to copy in image. */
3091 shdr
->sh_addr
= (unsigned long)dest
;
3092 pr_debug("\t0x%lx %s\n",
3093 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
3099 static int check_module_license_and_versions(struct module
*mod
)
3101 int prev_taint
= test_taint(TAINT_PROPRIETARY_MODULE
);
3104 * ndiswrapper is under GPL by itself, but loads proprietary modules.
3105 * Don't use add_taint_module(), as it would prevent ndiswrapper from
3106 * using GPL-only symbols it needs.
3108 if (strcmp(mod
->name
, "ndiswrapper") == 0)
3109 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
3111 /* driverloader was caught wrongly pretending to be under GPL */
3112 if (strcmp(mod
->name
, "driverloader") == 0)
3113 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3114 LOCKDEP_NOW_UNRELIABLE
);
3116 /* lve claims to be GPL but upstream won't provide source */
3117 if (strcmp(mod
->name
, "lve") == 0)
3118 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3119 LOCKDEP_NOW_UNRELIABLE
);
3121 if (!prev_taint
&& test_taint(TAINT_PROPRIETARY_MODULE
))
3122 pr_warn("%s: module license taints kernel.\n", mod
->name
);
3124 #ifdef CONFIG_MODVERSIONS
3125 if ((mod
->num_syms
&& !mod
->crcs
)
3126 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
3127 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
3128 #ifdef CONFIG_UNUSED_SYMBOLS
3129 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
3130 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
3133 return try_to_force_load(mod
,
3134 "no versions for exported symbols");
3140 static void flush_module_icache(const struct module
*mod
)
3142 mm_segment_t old_fs
;
3144 /* flush the icache in correct context */
3149 * Flush the instruction cache, since we've played with text.
3150 * Do it before processing of module parameters, so the module
3151 * can provide parameter accessor functions of its own.
3153 if (mod
->init_layout
.base
)
3154 flush_icache_range((unsigned long)mod
->init_layout
.base
,
3155 (unsigned long)mod
->init_layout
.base
3156 + mod
->init_layout
.size
);
3157 flush_icache_range((unsigned long)mod
->core_layout
.base
,
3158 (unsigned long)mod
->core_layout
.base
+ mod
->core_layout
.size
);
3163 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
3171 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
3173 /* Module within temporary copy. */
3177 mod
= setup_load_info(info
, flags
);
3181 err
= check_modinfo(mod
, info
, flags
);
3183 return ERR_PTR(err
);
3185 /* Allow arches to frob section contents and sizes. */
3186 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
3187 info
->secstrings
, mod
);
3189 return ERR_PTR(err
);
3191 /* We will do a special allocation for per-cpu sections later. */
3192 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
3194 /* Determine total sizes, and put offsets in sh_entsize. For now
3195 this is done generically; there doesn't appear to be any
3196 special cases for the architectures. */
3197 layout_sections(mod
, info
);
3198 layout_symtab(mod
, info
);
3200 /* Allocate and move to the final place */
3201 err
= move_module(mod
, info
);
3203 return ERR_PTR(err
);
3205 /* Module has been copied to its final place now: return it. */
3206 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
3207 kmemleak_load_module(mod
, info
);
3211 /* mod is no longer valid after this! */
3212 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
3214 percpu_modfree(mod
);
3215 module_arch_freeing_init(mod
);
3216 module_memfree(mod
->init_layout
.base
);
3217 module_memfree(mod
->core_layout
.base
);
3220 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
3221 const Elf_Shdr
*sechdrs
,
3227 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
3229 /* Sort exception table now relocations are done. */
3230 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
3232 /* Copy relocated percpu area over. */
3233 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
3234 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
3236 /* Setup kallsyms-specific fields. */
3237 add_kallsyms(mod
, info
);
3239 /* Arch-specific module finalizing. */
3240 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3243 /* Is this module of this name done loading? No locks held. */
3244 static bool finished_loading(const char *name
)
3250 * The module_mutex should not be a heavily contended lock;
3251 * if we get the occasional sleep here, we'll go an extra iteration
3252 * in the wait_event_interruptible(), which is harmless.
3254 sched_annotate_sleep();
3255 mutex_lock(&module_mutex
);
3256 mod
= find_module_all(name
, strlen(name
), true);
3257 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3258 || mod
->state
== MODULE_STATE_GOING
;
3259 mutex_unlock(&module_mutex
);
3264 /* Call module constructors. */
3265 static void do_mod_ctors(struct module
*mod
)
3267 #ifdef CONFIG_CONSTRUCTORS
3270 for (i
= 0; i
< mod
->num_ctors
; i
++)
3275 /* For freeing module_init on success, in case kallsyms traversing */
3276 struct mod_initfree
{
3277 struct rcu_head rcu
;
3281 static void do_free_init(struct rcu_head
*head
)
3283 struct mod_initfree
*m
= container_of(head
, struct mod_initfree
, rcu
);
3284 module_memfree(m
->module_init
);
3289 * This is where the real work happens.
3291 * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
3292 * helper command 'lx-symbols'.
3294 static noinline
int do_init_module(struct module
*mod
)
3297 struct mod_initfree
*freeinit
;
3299 freeinit
= kmalloc(sizeof(*freeinit
), GFP_KERNEL
);
3304 freeinit
->module_init
= mod
->init_layout
.base
;
3307 * We want to find out whether @mod uses async during init. Clear
3308 * PF_USED_ASYNC. async_schedule*() will set it.
3310 current
->flags
&= ~PF_USED_ASYNC
;
3313 /* Start the module */
3314 if (mod
->init
!= NULL
)
3315 ret
= do_one_initcall(mod
->init
);
3317 goto fail_free_freeinit
;
3320 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3321 "follow 0/-E convention\n"
3322 "%s: loading module anyway...\n",
3323 __func__
, mod
->name
, ret
, __func__
);
3327 /* Now it's a first class citizen! */
3328 mod
->state
= MODULE_STATE_LIVE
;
3329 blocking_notifier_call_chain(&module_notify_list
,
3330 MODULE_STATE_LIVE
, mod
);
3333 * We need to finish all async code before the module init sequence
3334 * is done. This has potential to deadlock. For example, a newly
3335 * detected block device can trigger request_module() of the
3336 * default iosched from async probing task. Once userland helper
3337 * reaches here, async_synchronize_full() will wait on the async
3338 * task waiting on request_module() and deadlock.
3340 * This deadlock is avoided by perfomring async_synchronize_full()
3341 * iff module init queued any async jobs. This isn't a full
3342 * solution as it will deadlock the same if module loading from
3343 * async jobs nests more than once; however, due to the various
3344 * constraints, this hack seems to be the best option for now.
3345 * Please refer to the following thread for details.
3347 * http://thread.gmane.org/gmane.linux.kernel/1420814
3349 if (!mod
->async_probe_requested
&& (current
->flags
& PF_USED_ASYNC
))
3350 async_synchronize_full();
3352 mutex_lock(&module_mutex
);
3353 /* Drop initial reference. */
3355 trim_init_extable(mod
);
3356 #ifdef CONFIG_KALLSYMS
3357 /* Switch to core kallsyms now init is done: kallsyms may be walking! */
3358 rcu_assign_pointer(mod
->kallsyms
, &mod
->core_kallsyms
);
3360 mod_tree_remove_init(mod
);
3361 disable_ro_nx(&mod
->init_layout
);
3362 module_arch_freeing_init(mod
);
3363 mod
->init_layout
.base
= NULL
;
3364 mod
->init_layout
.size
= 0;
3365 mod
->init_layout
.ro_size
= 0;
3366 mod
->init_layout
.text_size
= 0;
3368 * We want to free module_init, but be aware that kallsyms may be
3369 * walking this with preempt disabled. In all the failure paths, we
3370 * call synchronize_sched(), but we don't want to slow down the success
3371 * path, so use actual RCU here.
3373 call_rcu_sched(&freeinit
->rcu
, do_free_init
);
3374 mutex_unlock(&module_mutex
);
3375 wake_up_all(&module_wq
);
3382 /* Try to protect us from buggy refcounters. */
3383 mod
->state
= MODULE_STATE_GOING
;
3384 synchronize_sched();
3386 blocking_notifier_call_chain(&module_notify_list
,
3387 MODULE_STATE_GOING
, mod
);
3388 klp_module_going(mod
);
3389 ftrace_release_mod(mod
);
3391 wake_up_all(&module_wq
);
3395 static int may_init_module(void)
3397 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3404 * We try to place it in the list now to make sure it's unique before
3405 * we dedicate too many resources. In particular, temporary percpu
3406 * memory exhaustion.
3408 static int add_unformed_module(struct module
*mod
)
3413 mod
->state
= MODULE_STATE_UNFORMED
;
3416 mutex_lock(&module_mutex
);
3417 old
= find_module_all(mod
->name
, strlen(mod
->name
), true);
3419 if (old
->state
== MODULE_STATE_COMING
3420 || old
->state
== MODULE_STATE_UNFORMED
) {
3421 /* Wait in case it fails to load. */
3422 mutex_unlock(&module_mutex
);
3423 err
= wait_event_interruptible(module_wq
,
3424 finished_loading(mod
->name
));
3432 mod_update_bounds(mod
);
3433 list_add_rcu(&mod
->list
, &modules
);
3434 mod_tree_insert(mod
);
3438 mutex_unlock(&module_mutex
);
3443 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3447 mutex_lock(&module_mutex
);
3449 /* Find duplicate symbols (must be called under lock). */
3450 err
= verify_export_symbols(mod
);
3454 /* This relies on module_mutex for list integrity. */
3455 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3457 /* Set RO and NX regions */
3458 module_enable_ro(mod
);
3459 module_enable_nx(mod
);
3461 /* Mark state as coming so strong_try_module_get() ignores us,
3462 * but kallsyms etc. can see us. */
3463 mod
->state
= MODULE_STATE_COMING
;
3464 mutex_unlock(&module_mutex
);
3469 mutex_unlock(&module_mutex
);
3473 static int prepare_coming_module(struct module
*mod
)
3477 ftrace_module_enable(mod
);
3478 err
= klp_module_coming(mod
);
3482 blocking_notifier_call_chain(&module_notify_list
,
3483 MODULE_STATE_COMING
, mod
);
3487 static int unknown_module_param_cb(char *param
, char *val
, const char *modname
,
3490 struct module
*mod
= arg
;
3493 if (strcmp(param
, "async_probe") == 0) {
3494 mod
->async_probe_requested
= true;
3498 /* Check for magic 'dyndbg' arg */
3499 ret
= ddebug_dyndbg_module_param_cb(param
, val
, modname
);
3501 pr_warn("%s: unknown parameter '%s' ignored\n", modname
, param
);
3505 /* Allocate and load the module: note that size of section 0 is always
3506 zero, and we rely on this for optional sections. */
3507 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3514 err
= module_sig_check(info
, flags
);
3518 err
= elf_header_check(info
);
3522 /* Figure out module layout, and allocate all the memory. */
3523 mod
= layout_and_allocate(info
, flags
);
3529 /* Reserve our place in the list. */
3530 err
= add_unformed_module(mod
);
3534 #ifdef CONFIG_MODULE_SIG
3535 mod
->sig_ok
= info
->sig_ok
;
3537 pr_notice_once("%s: module verification failed: signature "
3538 "and/or required key missing - tainting "
3539 "kernel\n", mod
->name
);
3540 add_taint_module(mod
, TAINT_UNSIGNED_MODULE
, LOCKDEP_STILL_OK
);
3544 /* To avoid stressing percpu allocator, do this once we're unique. */
3545 err
= percpu_modalloc(mod
, info
);
3549 /* Now module is in final location, initialize linked lists, etc. */
3550 err
= module_unload_init(mod
);
3554 init_param_lock(mod
);
3556 /* Now we've got everything in the final locations, we can
3557 * find optional sections. */
3558 err
= find_module_sections(mod
, info
);
3562 err
= check_module_license_and_versions(mod
);
3566 /* Set up MODINFO_ATTR fields */
3567 setup_modinfo(mod
, info
);
3569 /* Fix up syms, so that st_value is a pointer to location. */
3570 err
= simplify_symbols(mod
, info
);
3574 err
= apply_relocations(mod
, info
);
3578 err
= post_relocation(mod
, info
);
3582 flush_module_icache(mod
);
3584 /* Now copy in args */
3585 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3586 if (IS_ERR(mod
->args
)) {
3587 err
= PTR_ERR(mod
->args
);
3588 goto free_arch_cleanup
;
3591 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3593 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3594 ftrace_module_init(mod
);
3596 /* Finally it's fully formed, ready to start executing. */
3597 err
= complete_formation(mod
, info
);
3599 goto ddebug_cleanup
;
3601 err
= prepare_coming_module(mod
);
3605 /* Module is ready to execute: parsing args may do that. */
3606 after_dashes
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3608 unknown_module_param_cb
);
3609 if (IS_ERR(after_dashes
)) {
3610 err
= PTR_ERR(after_dashes
);
3611 goto coming_cleanup
;
3612 } else if (after_dashes
) {
3613 pr_warn("%s: parameters '%s' after `--' ignored\n",
3614 mod
->name
, after_dashes
);
3617 /* Link in to syfs. */
3618 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3620 goto coming_cleanup
;
3622 if (is_livepatch_module(mod
)) {
3623 err
= copy_module_elf(mod
, info
);
3628 /* Get rid of temporary copy. */
3632 trace_module_load(mod
);
3634 return do_init_module(mod
);
3637 mod_sysfs_teardown(mod
);
3639 blocking_notifier_call_chain(&module_notify_list
,
3640 MODULE_STATE_GOING
, mod
);
3641 klp_module_going(mod
);
3643 /* module_bug_cleanup needs module_mutex protection */
3644 mutex_lock(&module_mutex
);
3645 module_bug_cleanup(mod
);
3646 mutex_unlock(&module_mutex
);
3648 /* we can't deallocate the module until we clear memory protection */
3649 module_disable_ro(mod
);
3650 module_disable_nx(mod
);
3653 dynamic_debug_remove(info
->debug
);
3654 synchronize_sched();
3657 module_arch_cleanup(mod
);
3661 module_unload_free(mod
);
3663 mutex_lock(&module_mutex
);
3664 /* Unlink carefully: kallsyms could be walking list. */
3665 list_del_rcu(&mod
->list
);
3666 mod_tree_remove(mod
);
3667 wake_up_all(&module_wq
);
3668 /* Wait for RCU-sched synchronizing before releasing mod->list. */
3669 synchronize_sched();
3670 mutex_unlock(&module_mutex
);
3673 * Ftrace needs to clean up what it initialized.
3674 * This does nothing if ftrace_module_init() wasn't called,
3675 * but it must be called outside of module_mutex.
3677 ftrace_release_mod(mod
);
3678 /* Free lock-classes; relies on the preceding sync_rcu() */
3679 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
3681 module_deallocate(mod
, info
);
3687 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3688 unsigned long, len
, const char __user
*, uargs
)
3691 struct load_info info
= { };
3693 err
= may_init_module();
3697 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3700 err
= copy_module_from_user(umod
, len
, &info
);
3704 return load_module(&info
, uargs
, 0);
3707 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3709 struct load_info info
= { };
3714 err
= may_init_module();
3718 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3720 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3721 |MODULE_INIT_IGNORE_VERMAGIC
))
3724 err
= kernel_read_file_from_fd(fd
, &hdr
, &size
, INT_MAX
,
3731 return load_module(&info
, uargs
, flags
);
3734 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3736 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3739 #ifdef CONFIG_KALLSYMS
3741 * This ignores the intensely annoying "mapping symbols" found
3742 * in ARM ELF files: $a, $t and $d.
3744 static inline int is_arm_mapping_symbol(const char *str
)
3746 if (str
[0] == '.' && str
[1] == 'L')
3748 return str
[0] == '$' && strchr("axtd", str
[1])
3749 && (str
[2] == '\0' || str
[2] == '.');
3752 static const char *symname(struct mod_kallsyms
*kallsyms
, unsigned int symnum
)
3754 return kallsyms
->strtab
+ kallsyms
->symtab
[symnum
].st_name
;
3757 static const char *get_ksymbol(struct module
*mod
,
3759 unsigned long *size
,
3760 unsigned long *offset
)
3762 unsigned int i
, best
= 0;
3763 unsigned long nextval
;
3764 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3766 /* At worse, next value is at end of module */
3767 if (within_module_init(addr
, mod
))
3768 nextval
= (unsigned long)mod
->init_layout
.base
+mod
->init_layout
.text_size
;
3770 nextval
= (unsigned long)mod
->core_layout
.base
+mod
->core_layout
.text_size
;
3772 /* Scan for closest preceding symbol, and next symbol. (ELF
3773 starts real symbols at 1). */
3774 for (i
= 1; i
< kallsyms
->num_symtab
; i
++) {
3775 if (kallsyms
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3778 /* We ignore unnamed symbols: they're uninformative
3779 * and inserted at a whim. */
3780 if (*symname(kallsyms
, i
) == '\0'
3781 || is_arm_mapping_symbol(symname(kallsyms
, i
)))
3784 if (kallsyms
->symtab
[i
].st_value
<= addr
3785 && kallsyms
->symtab
[i
].st_value
> kallsyms
->symtab
[best
].st_value
)
3787 if (kallsyms
->symtab
[i
].st_value
> addr
3788 && kallsyms
->symtab
[i
].st_value
< nextval
)
3789 nextval
= kallsyms
->symtab
[i
].st_value
;
3796 *size
= nextval
- kallsyms
->symtab
[best
].st_value
;
3798 *offset
= addr
- kallsyms
->symtab
[best
].st_value
;
3799 return symname(kallsyms
, best
);
3802 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3803 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3804 const char *module_address_lookup(unsigned long addr
,
3805 unsigned long *size
,
3806 unsigned long *offset
,
3810 const char *ret
= NULL
;
3814 mod
= __module_address(addr
);
3817 *modname
= mod
->name
;
3818 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3820 /* Make a copy in here where it's safe */
3822 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3830 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3835 list_for_each_entry_rcu(mod
, &modules
, list
) {
3836 if (mod
->state
== MODULE_STATE_UNFORMED
)
3838 if (within_module(addr
, mod
)) {
3841 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3844 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3854 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3855 unsigned long *offset
, char *modname
, char *name
)
3860 list_for_each_entry_rcu(mod
, &modules
, list
) {
3861 if (mod
->state
== MODULE_STATE_UNFORMED
)
3863 if (within_module(addr
, mod
)) {
3866 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3870 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3872 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3882 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3883 char *name
, char *module_name
, int *exported
)
3888 list_for_each_entry_rcu(mod
, &modules
, list
) {
3889 struct mod_kallsyms
*kallsyms
;
3891 if (mod
->state
== MODULE_STATE_UNFORMED
)
3893 kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3894 if (symnum
< kallsyms
->num_symtab
) {
3895 *value
= kallsyms
->symtab
[symnum
].st_value
;
3896 *type
= kallsyms
->symtab
[symnum
].st_info
;
3897 strlcpy(name
, symname(kallsyms
, symnum
), KSYM_NAME_LEN
);
3898 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3899 *exported
= is_exported(name
, *value
, mod
);
3903 symnum
-= kallsyms
->num_symtab
;
3909 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3912 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3914 for (i
= 0; i
< kallsyms
->num_symtab
; i
++)
3915 if (strcmp(name
, symname(kallsyms
, i
)) == 0 &&
3916 kallsyms
->symtab
[i
].st_info
!= 'U')
3917 return kallsyms
->symtab
[i
].st_value
;
3921 /* Look for this name: can be of form module:name. */
3922 unsigned long module_kallsyms_lookup_name(const char *name
)
3926 unsigned long ret
= 0;
3928 /* Don't lock: we're in enough trouble already. */
3930 if ((colon
= strchr(name
, ':')) != NULL
) {
3931 if ((mod
= find_module_all(name
, colon
- name
, false)) != NULL
)
3932 ret
= mod_find_symname(mod
, colon
+1);
3934 list_for_each_entry_rcu(mod
, &modules
, list
) {
3935 if (mod
->state
== MODULE_STATE_UNFORMED
)
3937 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3945 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3946 struct module
*, unsigned long),
3953 module_assert_mutex();
3955 list_for_each_entry(mod
, &modules
, list
) {
3956 /* We hold module_mutex: no need for rcu_dereference_sched */
3957 struct mod_kallsyms
*kallsyms
= mod
->kallsyms
;
3959 if (mod
->state
== MODULE_STATE_UNFORMED
)
3961 for (i
= 0; i
< kallsyms
->num_symtab
; i
++) {
3962 ret
= fn(data
, symname(kallsyms
, i
),
3963 mod
, kallsyms
->symtab
[i
].st_value
);
3970 #endif /* CONFIG_KALLSYMS */
3972 static char *module_flags(struct module
*mod
, char *buf
)
3976 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
3978 mod
->state
== MODULE_STATE_GOING
||
3979 mod
->state
== MODULE_STATE_COMING
) {
3981 bx
+= module_flags_taint(mod
, buf
+ bx
);
3982 /* Show a - for module-is-being-unloaded */
3983 if (mod
->state
== MODULE_STATE_GOING
)
3985 /* Show a + for module-is-being-loaded */
3986 if (mod
->state
== MODULE_STATE_COMING
)
3995 #ifdef CONFIG_PROC_FS
3996 /* Called by the /proc file system to return a list of modules. */
3997 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3999 mutex_lock(&module_mutex
);
4000 return seq_list_start(&modules
, *pos
);
4003 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
4005 return seq_list_next(p
, &modules
, pos
);
4008 static void m_stop(struct seq_file
*m
, void *p
)
4010 mutex_unlock(&module_mutex
);
4013 static int m_show(struct seq_file
*m
, void *p
)
4015 struct module
*mod
= list_entry(p
, struct module
, list
);
4018 /* We always ignore unformed modules. */
4019 if (mod
->state
== MODULE_STATE_UNFORMED
)
4022 seq_printf(m
, "%s %u",
4023 mod
->name
, mod
->init_layout
.size
+ mod
->core_layout
.size
);
4024 print_unload_info(m
, mod
);
4026 /* Informative for users. */
4027 seq_printf(m
, " %s",
4028 mod
->state
== MODULE_STATE_GOING
? "Unloading" :
4029 mod
->state
== MODULE_STATE_COMING
? "Loading" :
4031 /* Used by oprofile and other similar tools. */
4032 seq_printf(m
, " 0x%pK", mod
->core_layout
.base
);
4036 seq_printf(m
, " %s", module_flags(mod
, buf
));
4042 /* Format: modulename size refcount deps address
4044 Where refcount is a number or -, and deps is a comma-separated list
4047 static const struct seq_operations modules_op
= {
4054 static int modules_open(struct inode
*inode
, struct file
*file
)
4056 return seq_open(file
, &modules_op
);
4059 static const struct file_operations proc_modules_operations
= {
4060 .open
= modules_open
,
4062 .llseek
= seq_lseek
,
4063 .release
= seq_release
,
4066 static int __init
proc_modules_init(void)
4068 proc_create("modules", 0, NULL
, &proc_modules_operations
);
4071 module_init(proc_modules_init
);
4074 /* Given an address, look for it in the module exception tables. */
4075 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
4077 const struct exception_table_entry
*e
= NULL
;
4081 list_for_each_entry_rcu(mod
, &modules
, list
) {
4082 if (mod
->state
== MODULE_STATE_UNFORMED
)
4084 if (mod
->num_exentries
== 0)
4087 e
= search_extable(mod
->extable
,
4088 mod
->extable
+ mod
->num_exentries
- 1,
4095 /* Now, if we found one, we are running inside it now, hence
4096 we cannot unload the module, hence no refcnt needed. */
4101 * is_module_address - is this address inside a module?
4102 * @addr: the address to check.
4104 * See is_module_text_address() if you simply want to see if the address
4105 * is code (not data).
4107 bool is_module_address(unsigned long addr
)
4112 ret
= __module_address(addr
) != NULL
;
4119 * __module_address - get the module which contains an address.
4120 * @addr: the address.
4122 * Must be called with preempt disabled or module mutex held so that
4123 * module doesn't get freed during this.
4125 struct module
*__module_address(unsigned long addr
)
4129 if (addr
< module_addr_min
|| addr
> module_addr_max
)
4132 module_assert_mutex_or_preempt();
4134 mod
= mod_find(addr
);
4136 BUG_ON(!within_module(addr
, mod
));
4137 if (mod
->state
== MODULE_STATE_UNFORMED
)
4142 EXPORT_SYMBOL_GPL(__module_address
);
4145 * is_module_text_address - is this address inside module code?
4146 * @addr: the address to check.
4148 * See is_module_address() if you simply want to see if the address is
4149 * anywhere in a module. See kernel_text_address() for testing if an
4150 * address corresponds to kernel or module code.
4152 bool is_module_text_address(unsigned long addr
)
4157 ret
= __module_text_address(addr
) != NULL
;
4164 * __module_text_address - get the module whose code contains an address.
4165 * @addr: the address.
4167 * Must be called with preempt disabled or module mutex held so that
4168 * module doesn't get freed during this.
4170 struct module
*__module_text_address(unsigned long addr
)
4172 struct module
*mod
= __module_address(addr
);
4174 /* Make sure it's within the text section. */
4175 if (!within(addr
, mod
->init_layout
.base
, mod
->init_layout
.text_size
)
4176 && !within(addr
, mod
->core_layout
.base
, mod
->core_layout
.text_size
))
4181 EXPORT_SYMBOL_GPL(__module_text_address
);
4183 /* Don't grab lock, we're oopsing. */
4184 void print_modules(void)
4189 printk(KERN_DEFAULT
"Modules linked in:");
4190 /* Most callers should already have preempt disabled, but make sure */
4192 list_for_each_entry_rcu(mod
, &modules
, list
) {
4193 if (mod
->state
== MODULE_STATE_UNFORMED
)
4195 pr_cont(" %s%s", mod
->name
, module_flags(mod
, buf
));
4198 if (last_unloaded_module
[0])
4199 pr_cont(" [last unloaded: %s]", last_unloaded_module
);
4203 #ifdef CONFIG_MODVERSIONS
4204 /* Generate the signature for all relevant module structures here.
4205 * If these change, we don't want to try to parse the module. */
4206 void module_layout(struct module
*mod
,
4207 struct modversion_info
*ver
,
4208 struct kernel_param
*kp
,
4209 struct kernel_symbol
*ks
,
4210 struct tracepoint
* const *tp
)
4213 EXPORT_SYMBOL(module_layout
);