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 <linux/dynamic_debug.h>
64 #include <uapi/linux/module.h>
65 #include "module-internal.h"
67 #define CREATE_TRACE_POINTS
68 #include <trace/events/module.h>
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
75 * Modules' sections will be aligned on page boundaries
76 * to ensure complete separation of code and data, but
77 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
79 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
80 # define debug_align(X) ALIGN(X, PAGE_SIZE)
82 # define debug_align(X) (X)
85 /* If this is set, the section belongs in the init part of the module */
86 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
90 * 1) List of modules (also safely readable with preempt_disable),
91 * 2) module_use links,
92 * 3) module_addr_min/module_addr_max.
93 * (delete and add uses RCU list operations). */
94 DEFINE_MUTEX(module_mutex
);
95 EXPORT_SYMBOL_GPL(module_mutex
);
96 static LIST_HEAD(modules
);
98 #ifdef CONFIG_MODULES_TREE_LOOKUP
101 * Use a latched RB-tree for __module_address(); this allows us to use
102 * RCU-sched lookups of the address from any context.
104 * This is conditional on PERF_EVENTS || TRACING because those can really hit
105 * __module_address() hard by doing a lot of stack unwinding; potentially from
109 static __always_inline
unsigned long __mod_tree_val(struct latch_tree_node
*n
)
111 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
113 return (unsigned long)layout
->base
;
116 static __always_inline
unsigned long __mod_tree_size(struct latch_tree_node
*n
)
118 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
120 return (unsigned long)layout
->size
;
123 static __always_inline
bool
124 mod_tree_less(struct latch_tree_node
*a
, struct latch_tree_node
*b
)
126 return __mod_tree_val(a
) < __mod_tree_val(b
);
129 static __always_inline
int
130 mod_tree_comp(void *key
, struct latch_tree_node
*n
)
132 unsigned long val
= (unsigned long)key
;
133 unsigned long start
, end
;
135 start
= __mod_tree_val(n
);
139 end
= start
+ __mod_tree_size(n
);
146 static const struct latch_tree_ops mod_tree_ops
= {
147 .less
= mod_tree_less
,
148 .comp
= mod_tree_comp
,
151 static struct mod_tree_root
{
152 struct latch_tree_root root
;
153 unsigned long addr_min
;
154 unsigned long addr_max
;
155 } mod_tree __cacheline_aligned
= {
159 #define module_addr_min mod_tree.addr_min
160 #define module_addr_max mod_tree.addr_max
162 static noinline
void __mod_tree_insert(struct mod_tree_node
*node
)
164 latch_tree_insert(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
167 static void __mod_tree_remove(struct mod_tree_node
*node
)
169 latch_tree_erase(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
173 * These modifications: insert, remove_init and remove; are serialized by the
176 static void mod_tree_insert(struct module
*mod
)
178 mod
->core_layout
.mtn
.mod
= mod
;
179 mod
->init_layout
.mtn
.mod
= mod
;
181 __mod_tree_insert(&mod
->core_layout
.mtn
);
182 if (mod
->init_layout
.size
)
183 __mod_tree_insert(&mod
->init_layout
.mtn
);
186 static void mod_tree_remove_init(struct module
*mod
)
188 if (mod
->init_layout
.size
)
189 __mod_tree_remove(&mod
->init_layout
.mtn
);
192 static void mod_tree_remove(struct module
*mod
)
194 __mod_tree_remove(&mod
->core_layout
.mtn
);
195 mod_tree_remove_init(mod
);
198 static struct module
*mod_find(unsigned long addr
)
200 struct latch_tree_node
*ltn
;
202 ltn
= latch_tree_find((void *)addr
, &mod_tree
.root
, &mod_tree_ops
);
206 return container_of(ltn
, struct mod_tree_node
, node
)->mod
;
209 #else /* MODULES_TREE_LOOKUP */
211 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
213 static void mod_tree_insert(struct module
*mod
) { }
214 static void mod_tree_remove_init(struct module
*mod
) { }
215 static void mod_tree_remove(struct module
*mod
) { }
217 static struct module
*mod_find(unsigned long addr
)
221 list_for_each_entry_rcu(mod
, &modules
, list
) {
222 if (within_module(addr
, mod
))
229 #endif /* MODULES_TREE_LOOKUP */
232 * Bounds of module text, for speeding up __module_address.
233 * Protected by module_mutex.
235 static void __mod_update_bounds(void *base
, unsigned int size
)
237 unsigned long min
= (unsigned long)base
;
238 unsigned long max
= min
+ size
;
240 if (min
< module_addr_min
)
241 module_addr_min
= min
;
242 if (max
> module_addr_max
)
243 module_addr_max
= max
;
246 static void mod_update_bounds(struct module
*mod
)
248 __mod_update_bounds(mod
->core_layout
.base
, mod
->core_layout
.size
);
249 if (mod
->init_layout
.size
)
250 __mod_update_bounds(mod
->init_layout
.base
, mod
->init_layout
.size
);
253 #ifdef CONFIG_KGDB_KDB
254 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
255 #endif /* CONFIG_KGDB_KDB */
257 static void module_assert_mutex(void)
259 lockdep_assert_held(&module_mutex
);
262 static void module_assert_mutex_or_preempt(void)
264 #ifdef CONFIG_LOCKDEP
265 if (unlikely(!debug_locks
))
268 WARN_ON(!rcu_read_lock_sched_held() &&
269 !lockdep_is_held(&module_mutex
));
273 static bool sig_enforce
= IS_ENABLED(CONFIG_MODULE_SIG_FORCE
);
274 #ifndef CONFIG_MODULE_SIG_FORCE
275 module_param(sig_enforce
, bool_enable_only
, 0644);
276 #endif /* !CONFIG_MODULE_SIG_FORCE */
278 /* Block module loading/unloading? */
279 int modules_disabled
= 0;
280 core_param(nomodule
, modules_disabled
, bint
, 0);
282 /* Waiting for a module to finish initializing? */
283 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
285 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
287 int register_module_notifier(struct notifier_block
*nb
)
289 return blocking_notifier_chain_register(&module_notify_list
, nb
);
291 EXPORT_SYMBOL(register_module_notifier
);
293 int unregister_module_notifier(struct notifier_block
*nb
)
295 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
297 EXPORT_SYMBOL(unregister_module_notifier
);
303 char *secstrings
, *strtab
;
304 unsigned long symoffs
, stroffs
;
305 struct _ddebug
*debug
;
306 unsigned int num_debug
;
308 #ifdef CONFIG_KALLSYMS
309 unsigned long mod_kallsyms_init_off
;
312 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
316 /* We require a truly strong try_module_get(): 0 means failure due to
317 ongoing or failed initialization etc. */
318 static inline int strong_try_module_get(struct module
*mod
)
320 BUG_ON(mod
&& mod
->state
== MODULE_STATE_UNFORMED
);
321 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
323 if (try_module_get(mod
))
329 static inline void add_taint_module(struct module
*mod
, unsigned flag
,
330 enum lockdep_ok lockdep_ok
)
332 add_taint(flag
, lockdep_ok
);
333 mod
->taints
|= (1U << flag
);
337 * A thread that wants to hold a reference to a module only while it
338 * is running can call this to safely exit. nfsd and lockd use this.
340 void __module_put_and_exit(struct module
*mod
, long code
)
345 EXPORT_SYMBOL(__module_put_and_exit
);
347 /* Find a module section: 0 means not found. */
348 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
352 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
353 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
354 /* Alloc bit cleared means "ignore it." */
355 if ((shdr
->sh_flags
& SHF_ALLOC
)
356 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
362 /* Find a module section, or NULL. */
363 static void *section_addr(const struct load_info
*info
, const char *name
)
365 /* Section 0 has sh_addr 0. */
366 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
369 /* Find a module section, or NULL. Fill in number of "objects" in section. */
370 static void *section_objs(const struct load_info
*info
,
375 unsigned int sec
= find_sec(info
, name
);
377 /* Section 0 has sh_addr 0 and sh_size 0. */
378 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
379 return (void *)info
->sechdrs
[sec
].sh_addr
;
382 /* Provided by the linker */
383 extern const struct kernel_symbol __start___ksymtab
[];
384 extern const struct kernel_symbol __stop___ksymtab
[];
385 extern const struct kernel_symbol __start___ksymtab_gpl
[];
386 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
387 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
388 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
389 extern const unsigned long __start___kcrctab
[];
390 extern const unsigned long __start___kcrctab_gpl
[];
391 extern const unsigned long __start___kcrctab_gpl_future
[];
392 #ifdef CONFIG_UNUSED_SYMBOLS
393 extern const struct kernel_symbol __start___ksymtab_unused
[];
394 extern const struct kernel_symbol __stop___ksymtab_unused
[];
395 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
396 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
397 extern const unsigned long __start___kcrctab_unused
[];
398 extern const unsigned long __start___kcrctab_unused_gpl
[];
401 #ifndef CONFIG_MODVERSIONS
402 #define symversion(base, idx) NULL
404 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
407 static bool each_symbol_in_section(const struct symsearch
*arr
,
408 unsigned int arrsize
,
409 struct module
*owner
,
410 bool (*fn
)(const struct symsearch
*syms
,
411 struct module
*owner
,
417 for (j
= 0; j
< arrsize
; j
++) {
418 if (fn(&arr
[j
], owner
, data
))
425 /* Returns true as soon as fn returns true, otherwise false. */
426 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
427 struct module
*owner
,
432 static const struct symsearch arr
[] = {
433 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
434 NOT_GPL_ONLY
, false },
435 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
436 __start___kcrctab_gpl
,
438 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
439 __start___kcrctab_gpl_future
,
440 WILL_BE_GPL_ONLY
, false },
441 #ifdef CONFIG_UNUSED_SYMBOLS
442 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
443 __start___kcrctab_unused
,
444 NOT_GPL_ONLY
, true },
445 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
446 __start___kcrctab_unused_gpl
,
451 module_assert_mutex_or_preempt();
453 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
456 list_for_each_entry_rcu(mod
, &modules
, list
) {
457 struct symsearch arr
[] = {
458 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
459 NOT_GPL_ONLY
, false },
460 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
463 { mod
->gpl_future_syms
,
464 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
465 mod
->gpl_future_crcs
,
466 WILL_BE_GPL_ONLY
, false },
467 #ifdef CONFIG_UNUSED_SYMBOLS
469 mod
->unused_syms
+ mod
->num_unused_syms
,
471 NOT_GPL_ONLY
, true },
472 { mod
->unused_gpl_syms
,
473 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
474 mod
->unused_gpl_crcs
,
479 if (mod
->state
== MODULE_STATE_UNFORMED
)
482 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
487 EXPORT_SYMBOL_GPL(each_symbol_section
);
489 struct find_symbol_arg
{
496 struct module
*owner
;
497 const unsigned long *crc
;
498 const struct kernel_symbol
*sym
;
501 static bool check_symbol(const struct symsearch
*syms
,
502 struct module
*owner
,
503 unsigned int symnum
, void *data
)
505 struct find_symbol_arg
*fsa
= data
;
508 if (syms
->licence
== GPL_ONLY
)
510 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
511 pr_warn("Symbol %s is being used by a non-GPL module, "
512 "which will not be allowed in the future\n",
517 #ifdef CONFIG_UNUSED_SYMBOLS
518 if (syms
->unused
&& fsa
->warn
) {
519 pr_warn("Symbol %s is marked as UNUSED, however this module is "
520 "using it.\n", fsa
->name
);
521 pr_warn("This symbol will go away in the future.\n");
522 pr_warn("Please evaluate if this is the right api to use and "
523 "if it really is, submit a report to the linux kernel "
524 "mailing list together with submitting your code for "
530 fsa
->crc
= symversion(syms
->crcs
, symnum
);
531 fsa
->sym
= &syms
->start
[symnum
];
535 static int cmp_name(const void *va
, const void *vb
)
538 const struct kernel_symbol
*b
;
540 return strcmp(a
, b
->name
);
543 static bool find_symbol_in_section(const struct symsearch
*syms
,
544 struct module
*owner
,
547 struct find_symbol_arg
*fsa
= data
;
548 struct kernel_symbol
*sym
;
550 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
551 sizeof(struct kernel_symbol
), cmp_name
);
553 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
559 /* Find a symbol and return it, along with, (optional) crc and
560 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
561 const struct kernel_symbol
*find_symbol(const char *name
,
562 struct module
**owner
,
563 const unsigned long **crc
,
567 struct find_symbol_arg fsa
;
573 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
581 pr_debug("Failed to find symbol %s\n", name
);
584 EXPORT_SYMBOL_GPL(find_symbol
);
587 * Search for module by name: must hold module_mutex (or preempt disabled
588 * for read-only access).
590 static struct module
*find_module_all(const char *name
, size_t len
,
595 module_assert_mutex_or_preempt();
597 list_for_each_entry(mod
, &modules
, list
) {
598 if (!even_unformed
&& mod
->state
== MODULE_STATE_UNFORMED
)
600 if (strlen(mod
->name
) == len
&& !memcmp(mod
->name
, name
, len
))
606 struct module
*find_module(const char *name
)
608 module_assert_mutex();
609 return find_module_all(name
, strlen(name
), false);
611 EXPORT_SYMBOL_GPL(find_module
);
615 static inline void __percpu
*mod_percpu(struct module
*mod
)
620 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
622 Elf_Shdr
*pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
623 unsigned long align
= pcpusec
->sh_addralign
;
625 if (!pcpusec
->sh_size
)
628 if (align
> PAGE_SIZE
) {
629 pr_warn("%s: per-cpu alignment %li > %li\n",
630 mod
->name
, align
, PAGE_SIZE
);
634 mod
->percpu
= __alloc_reserved_percpu(pcpusec
->sh_size
, align
);
636 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
637 mod
->name
, (unsigned long)pcpusec
->sh_size
);
640 mod
->percpu_size
= pcpusec
->sh_size
;
644 static void percpu_modfree(struct module
*mod
)
646 free_percpu(mod
->percpu
);
649 static unsigned int find_pcpusec(struct load_info
*info
)
651 return find_sec(info
, ".data..percpu");
654 static void percpu_modcopy(struct module
*mod
,
655 const void *from
, unsigned long size
)
659 for_each_possible_cpu(cpu
)
660 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
664 * is_module_percpu_address - test whether address is from module static percpu
665 * @addr: address to test
667 * Test whether @addr belongs to module static percpu area.
670 * %true if @addr is from module static percpu area
672 bool is_module_percpu_address(unsigned long addr
)
679 list_for_each_entry_rcu(mod
, &modules
, list
) {
680 if (mod
->state
== MODULE_STATE_UNFORMED
)
682 if (!mod
->percpu_size
)
684 for_each_possible_cpu(cpu
) {
685 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
687 if ((void *)addr
>= start
&&
688 (void *)addr
< start
+ mod
->percpu_size
) {
699 #else /* ... !CONFIG_SMP */
701 static inline void __percpu
*mod_percpu(struct module
*mod
)
705 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
707 /* UP modules shouldn't have this section: ENOMEM isn't quite right */
708 if (info
->sechdrs
[info
->index
.pcpu
].sh_size
!= 0)
712 static inline void percpu_modfree(struct module
*mod
)
715 static unsigned int find_pcpusec(struct load_info
*info
)
719 static inline void percpu_modcopy(struct module
*mod
,
720 const void *from
, unsigned long size
)
722 /* pcpusec should be 0, and size of that section should be 0. */
725 bool is_module_percpu_address(unsigned long addr
)
730 #endif /* CONFIG_SMP */
732 #define MODINFO_ATTR(field) \
733 static void setup_modinfo_##field(struct module *mod, const char *s) \
735 mod->field = kstrdup(s, GFP_KERNEL); \
737 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
738 struct module_kobject *mk, char *buffer) \
740 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
742 static int modinfo_##field##_exists(struct module *mod) \
744 return mod->field != NULL; \
746 static void free_modinfo_##field(struct module *mod) \
751 static struct module_attribute modinfo_##field = { \
752 .attr = { .name = __stringify(field), .mode = 0444 }, \
753 .show = show_modinfo_##field, \
754 .setup = setup_modinfo_##field, \
755 .test = modinfo_##field##_exists, \
756 .free = free_modinfo_##field, \
759 MODINFO_ATTR(version
);
760 MODINFO_ATTR(srcversion
);
762 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
764 #ifdef CONFIG_MODULE_UNLOAD
766 EXPORT_TRACEPOINT_SYMBOL(module_get
);
768 /* MODULE_REF_BASE is the base reference count by kmodule loader. */
769 #define MODULE_REF_BASE 1
771 /* Init the unload section of the module. */
772 static int module_unload_init(struct module
*mod
)
775 * Initialize reference counter to MODULE_REF_BASE.
776 * refcnt == 0 means module is going.
778 atomic_set(&mod
->refcnt
, MODULE_REF_BASE
);
780 INIT_LIST_HEAD(&mod
->source_list
);
781 INIT_LIST_HEAD(&mod
->target_list
);
783 /* Hold reference count during initialization. */
784 atomic_inc(&mod
->refcnt
);
789 /* Does a already use b? */
790 static int already_uses(struct module
*a
, struct module
*b
)
792 struct module_use
*use
;
794 list_for_each_entry(use
, &b
->source_list
, source_list
) {
795 if (use
->source
== a
) {
796 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
800 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
806 * - we add 'a' as a "source", 'b' as a "target" of module use
807 * - the module_use is added to the list of 'b' sources (so
808 * 'b' can walk the list to see who sourced them), and of 'a'
809 * targets (so 'a' can see what modules it targets).
811 static int add_module_usage(struct module
*a
, struct module
*b
)
813 struct module_use
*use
;
815 pr_debug("Allocating new usage for %s.\n", a
->name
);
816 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
818 pr_warn("%s: out of memory loading\n", a
->name
);
824 list_add(&use
->source_list
, &b
->source_list
);
825 list_add(&use
->target_list
, &a
->target_list
);
829 /* Module a uses b: caller needs module_mutex() */
830 int ref_module(struct module
*a
, struct module
*b
)
834 if (b
== NULL
|| already_uses(a
, b
))
837 /* If module isn't available, we fail. */
838 err
= strong_try_module_get(b
);
842 err
= add_module_usage(a
, b
);
849 EXPORT_SYMBOL_GPL(ref_module
);
851 /* Clear the unload stuff of the module. */
852 static void module_unload_free(struct module
*mod
)
854 struct module_use
*use
, *tmp
;
856 mutex_lock(&module_mutex
);
857 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
858 struct module
*i
= use
->target
;
859 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
861 list_del(&use
->source_list
);
862 list_del(&use
->target_list
);
865 mutex_unlock(&module_mutex
);
868 #ifdef CONFIG_MODULE_FORCE_UNLOAD
869 static inline int try_force_unload(unsigned int flags
)
871 int ret
= (flags
& O_TRUNC
);
873 add_taint(TAINT_FORCED_RMMOD
, LOCKDEP_NOW_UNRELIABLE
);
877 static inline int try_force_unload(unsigned int flags
)
881 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
883 /* Try to release refcount of module, 0 means success. */
884 static int try_release_module_ref(struct module
*mod
)
888 /* Try to decrement refcnt which we set at loading */
889 ret
= atomic_sub_return(MODULE_REF_BASE
, &mod
->refcnt
);
892 /* Someone can put this right now, recover with checking */
893 ret
= atomic_add_unless(&mod
->refcnt
, MODULE_REF_BASE
, 0);
898 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
900 /* If it's not unused, quit unless we're forcing. */
901 if (try_release_module_ref(mod
) != 0) {
902 *forced
= try_force_unload(flags
);
907 /* Mark it as dying. */
908 mod
->state
= MODULE_STATE_GOING
;
914 * module_refcount - return the refcount or -1 if unloading
916 * @mod: the module we're checking
919 * -1 if the module is in the process of unloading
920 * otherwise the number of references in the kernel to the module
922 int module_refcount(struct module
*mod
)
924 return atomic_read(&mod
->refcnt
) - MODULE_REF_BASE
;
926 EXPORT_SYMBOL(module_refcount
);
928 /* This exists whether we can unload or not */
929 static void free_module(struct module
*mod
);
931 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
935 char name
[MODULE_NAME_LEN
];
938 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
941 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
943 name
[MODULE_NAME_LEN
-1] = '\0';
945 if (mutex_lock_interruptible(&module_mutex
) != 0)
948 mod
= find_module(name
);
954 if (!list_empty(&mod
->source_list
)) {
955 /* Other modules depend on us: get rid of them first. */
960 /* Doing init or already dying? */
961 if (mod
->state
!= MODULE_STATE_LIVE
) {
962 /* FIXME: if (force), slam module count damn the torpedoes */
963 pr_debug("%s already dying\n", mod
->name
);
968 /* If it has an init func, it must have an exit func to unload */
969 if (mod
->init
&& !mod
->exit
) {
970 forced
= try_force_unload(flags
);
972 /* This module can't be removed */
978 /* Stop the machine so refcounts can't move and disable module. */
979 ret
= try_stop_module(mod
, flags
, &forced
);
983 mutex_unlock(&module_mutex
);
984 /* Final destruction now no one is using it. */
985 if (mod
->exit
!= NULL
)
987 blocking_notifier_call_chain(&module_notify_list
,
988 MODULE_STATE_GOING
, mod
);
989 klp_module_going(mod
);
990 ftrace_release_mod(mod
);
992 async_synchronize_full();
994 /* Store the name of the last unloaded module for diagnostic purposes */
995 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
1000 mutex_unlock(&module_mutex
);
1004 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1006 struct module_use
*use
;
1007 int printed_something
= 0;
1009 seq_printf(m
, " %i ", module_refcount(mod
));
1012 * Always include a trailing , so userspace can differentiate
1013 * between this and the old multi-field proc format.
1015 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
1016 printed_something
= 1;
1017 seq_printf(m
, "%s,", use
->source
->name
);
1020 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
1021 printed_something
= 1;
1022 seq_puts(m
, "[permanent],");
1025 if (!printed_something
)
1029 void __symbol_put(const char *symbol
)
1031 struct module
*owner
;
1034 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
1039 EXPORT_SYMBOL(__symbol_put
);
1041 /* Note this assumes addr is a function, which it currently always is. */
1042 void symbol_put_addr(void *addr
)
1044 struct module
*modaddr
;
1045 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
1047 if (core_kernel_text(a
))
1051 * Even though we hold a reference on the module; we still need to
1052 * disable preemption in order to safely traverse the data structure.
1055 modaddr
= __module_text_address(a
);
1057 module_put(modaddr
);
1060 EXPORT_SYMBOL_GPL(symbol_put_addr
);
1062 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
1063 struct module_kobject
*mk
, char *buffer
)
1065 return sprintf(buffer
, "%i\n", module_refcount(mk
->mod
));
1068 static struct module_attribute modinfo_refcnt
=
1069 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
1071 void __module_get(struct module
*module
)
1075 atomic_inc(&module
->refcnt
);
1076 trace_module_get(module
, _RET_IP_
);
1080 EXPORT_SYMBOL(__module_get
);
1082 bool try_module_get(struct module
*module
)
1088 /* Note: here, we can fail to get a reference */
1089 if (likely(module_is_live(module
) &&
1090 atomic_inc_not_zero(&module
->refcnt
) != 0))
1091 trace_module_get(module
, _RET_IP_
);
1099 EXPORT_SYMBOL(try_module_get
);
1101 void module_put(struct module
*module
)
1107 ret
= atomic_dec_if_positive(&module
->refcnt
);
1108 WARN_ON(ret
< 0); /* Failed to put refcount */
1109 trace_module_put(module
, _RET_IP_
);
1113 EXPORT_SYMBOL(module_put
);
1115 #else /* !CONFIG_MODULE_UNLOAD */
1116 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1118 /* We don't know the usage count, or what modules are using. */
1119 seq_puts(m
, " - -");
1122 static inline void module_unload_free(struct module
*mod
)
1126 int ref_module(struct module
*a
, struct module
*b
)
1128 return strong_try_module_get(b
);
1130 EXPORT_SYMBOL_GPL(ref_module
);
1132 static inline int module_unload_init(struct module
*mod
)
1136 #endif /* CONFIG_MODULE_UNLOAD */
1138 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1142 if (mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
))
1144 if (mod
->taints
& (1 << TAINT_OOT_MODULE
))
1146 if (mod
->taints
& (1 << TAINT_FORCED_MODULE
))
1148 if (mod
->taints
& (1 << TAINT_CRAP
))
1150 if (mod
->taints
& (1 << TAINT_UNSIGNED_MODULE
))
1153 * TAINT_FORCED_RMMOD: could be added.
1154 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1160 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1161 struct module_kobject
*mk
, char *buffer
)
1163 const char *state
= "unknown";
1165 switch (mk
->mod
->state
) {
1166 case MODULE_STATE_LIVE
:
1169 case MODULE_STATE_COMING
:
1172 case MODULE_STATE_GOING
:
1178 return sprintf(buffer
, "%s\n", state
);
1181 static struct module_attribute modinfo_initstate
=
1182 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1184 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1185 struct module_kobject
*mk
,
1186 const char *buffer
, size_t count
)
1188 enum kobject_action action
;
1190 if (kobject_action_type(buffer
, count
, &action
) == 0)
1191 kobject_uevent(&mk
->kobj
, action
);
1195 struct module_attribute module_uevent
=
1196 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1198 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1199 struct module_kobject
*mk
, char *buffer
)
1201 return sprintf(buffer
, "%u\n", mk
->mod
->core_layout
.size
);
1204 static struct module_attribute modinfo_coresize
=
1205 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1207 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1208 struct module_kobject
*mk
, char *buffer
)
1210 return sprintf(buffer
, "%u\n", mk
->mod
->init_layout
.size
);
1213 static struct module_attribute modinfo_initsize
=
1214 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1216 static ssize_t
show_taint(struct module_attribute
*mattr
,
1217 struct module_kobject
*mk
, char *buffer
)
1221 l
= module_flags_taint(mk
->mod
, buffer
);
1226 static struct module_attribute modinfo_taint
=
1227 __ATTR(taint
, 0444, show_taint
, NULL
);
1229 static struct module_attribute
*modinfo_attrs
[] = {
1232 &modinfo_srcversion
,
1237 #ifdef CONFIG_MODULE_UNLOAD
1243 static const char vermagic
[] = VERMAGIC_STRING
;
1245 static int try_to_force_load(struct module
*mod
, const char *reason
)
1247 #ifdef CONFIG_MODULE_FORCE_LOAD
1248 if (!test_taint(TAINT_FORCED_MODULE
))
1249 pr_warn("%s: %s: kernel tainted.\n", mod
->name
, reason
);
1250 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
1257 #ifdef CONFIG_MODVERSIONS
1258 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1259 static unsigned long maybe_relocated(unsigned long crc
,
1260 const struct module
*crc_owner
)
1262 #ifdef ARCH_RELOCATES_KCRCTAB
1263 if (crc_owner
== NULL
)
1264 return crc
- (unsigned long)reloc_start
;
1269 static int check_version(Elf_Shdr
*sechdrs
,
1270 unsigned int versindex
,
1271 const char *symname
,
1273 const unsigned long *crc
,
1274 const struct module
*crc_owner
)
1276 unsigned int i
, num_versions
;
1277 struct modversion_info
*versions
;
1279 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1283 /* No versions at all? modprobe --force does this. */
1285 return try_to_force_load(mod
, symname
) == 0;
1287 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1288 num_versions
= sechdrs
[versindex
].sh_size
1289 / sizeof(struct modversion_info
);
1291 for (i
= 0; i
< num_versions
; i
++) {
1292 if (strcmp(versions
[i
].name
, symname
) != 0)
1295 if (versions
[i
].crc
== maybe_relocated(*crc
, crc_owner
))
1297 pr_debug("Found checksum %lX vs module %lX\n",
1298 maybe_relocated(*crc
, crc_owner
), versions
[i
].crc
);
1302 pr_warn("%s: no symbol version for %s\n", mod
->name
, symname
);
1306 pr_warn("%s: disagrees about version of symbol %s\n",
1307 mod
->name
, symname
);
1311 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1312 unsigned int versindex
,
1315 const unsigned long *crc
;
1318 * Since this should be found in kernel (which can't be removed), no
1319 * locking is necessary -- use preempt_disable() to placate lockdep.
1322 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout
), NULL
,
1323 &crc
, true, false)) {
1328 return check_version(sechdrs
, versindex
,
1329 VMLINUX_SYMBOL_STR(module_layout
), mod
, crc
,
1333 /* First part is kernel version, which we ignore if module has crcs. */
1334 static inline int same_magic(const char *amagic
, const char *bmagic
,
1338 amagic
+= strcspn(amagic
, " ");
1339 bmagic
+= strcspn(bmagic
, " ");
1341 return strcmp(amagic
, bmagic
) == 0;
1344 static inline int check_version(Elf_Shdr
*sechdrs
,
1345 unsigned int versindex
,
1346 const char *symname
,
1348 const unsigned long *crc
,
1349 const struct module
*crc_owner
)
1354 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1355 unsigned int versindex
,
1361 static inline int same_magic(const char *amagic
, const char *bmagic
,
1364 return strcmp(amagic
, bmagic
) == 0;
1366 #endif /* CONFIG_MODVERSIONS */
1368 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1369 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1370 const struct load_info
*info
,
1374 struct module
*owner
;
1375 const struct kernel_symbol
*sym
;
1376 const unsigned long *crc
;
1380 * The module_mutex should not be a heavily contended lock;
1381 * if we get the occasional sleep here, we'll go an extra iteration
1382 * in the wait_event_interruptible(), which is harmless.
1384 sched_annotate_sleep();
1385 mutex_lock(&module_mutex
);
1386 sym
= find_symbol(name
, &owner
, &crc
,
1387 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1391 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
,
1393 sym
= ERR_PTR(-EINVAL
);
1397 err
= ref_module(mod
, owner
);
1404 /* We must make copy under the lock if we failed to get ref. */
1405 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1407 mutex_unlock(&module_mutex
);
1411 static const struct kernel_symbol
*
1412 resolve_symbol_wait(struct module
*mod
,
1413 const struct load_info
*info
,
1416 const struct kernel_symbol
*ksym
;
1417 char owner
[MODULE_NAME_LEN
];
1419 if (wait_event_interruptible_timeout(module_wq
,
1420 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1421 || PTR_ERR(ksym
) != -EBUSY
,
1423 pr_warn("%s: gave up waiting for init of module %s.\n",
1430 * /sys/module/foo/sections stuff
1431 * J. Corbet <corbet@lwn.net>
1435 #ifdef CONFIG_KALLSYMS
1436 static inline bool sect_empty(const Elf_Shdr
*sect
)
1438 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1441 struct module_sect_attr
{
1442 struct module_attribute mattr
;
1444 unsigned long address
;
1447 struct module_sect_attrs
{
1448 struct attribute_group grp
;
1449 unsigned int nsections
;
1450 struct module_sect_attr attrs
[0];
1453 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1454 struct module_kobject
*mk
, char *buf
)
1456 struct module_sect_attr
*sattr
=
1457 container_of(mattr
, struct module_sect_attr
, mattr
);
1458 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1461 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1463 unsigned int section
;
1465 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1466 kfree(sect_attrs
->attrs
[section
].name
);
1470 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1472 unsigned int nloaded
= 0, i
, size
[2];
1473 struct module_sect_attrs
*sect_attrs
;
1474 struct module_sect_attr
*sattr
;
1475 struct attribute
**gattr
;
1477 /* Count loaded sections and allocate structures */
1478 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1479 if (!sect_empty(&info
->sechdrs
[i
]))
1481 size
[0] = ALIGN(sizeof(*sect_attrs
)
1482 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1483 sizeof(sect_attrs
->grp
.attrs
[0]));
1484 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1485 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1486 if (sect_attrs
== NULL
)
1489 /* Setup section attributes. */
1490 sect_attrs
->grp
.name
= "sections";
1491 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1493 sect_attrs
->nsections
= 0;
1494 sattr
= §_attrs
->attrs
[0];
1495 gattr
= §_attrs
->grp
.attrs
[0];
1496 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1497 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1498 if (sect_empty(sec
))
1500 sattr
->address
= sec
->sh_addr
;
1501 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1503 if (sattr
->name
== NULL
)
1505 sect_attrs
->nsections
++;
1506 sysfs_attr_init(&sattr
->mattr
.attr
);
1507 sattr
->mattr
.show
= module_sect_show
;
1508 sattr
->mattr
.store
= NULL
;
1509 sattr
->mattr
.attr
.name
= sattr
->name
;
1510 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1511 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1515 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1518 mod
->sect_attrs
= sect_attrs
;
1521 free_sect_attrs(sect_attrs
);
1524 static void remove_sect_attrs(struct module
*mod
)
1526 if (mod
->sect_attrs
) {
1527 sysfs_remove_group(&mod
->mkobj
.kobj
,
1528 &mod
->sect_attrs
->grp
);
1529 /* We are positive that no one is using any sect attrs
1530 * at this point. Deallocate immediately. */
1531 free_sect_attrs(mod
->sect_attrs
);
1532 mod
->sect_attrs
= NULL
;
1537 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1540 struct module_notes_attrs
{
1541 struct kobject
*dir
;
1543 struct bin_attribute attrs
[0];
1546 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1547 struct bin_attribute
*bin_attr
,
1548 char *buf
, loff_t pos
, size_t count
)
1551 * The caller checked the pos and count against our size.
1553 memcpy(buf
, bin_attr
->private + pos
, count
);
1557 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1560 if (notes_attrs
->dir
) {
1562 sysfs_remove_bin_file(notes_attrs
->dir
,
1563 ¬es_attrs
->attrs
[i
]);
1564 kobject_put(notes_attrs
->dir
);
1569 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1571 unsigned int notes
, loaded
, i
;
1572 struct module_notes_attrs
*notes_attrs
;
1573 struct bin_attribute
*nattr
;
1575 /* failed to create section attributes, so can't create notes */
1576 if (!mod
->sect_attrs
)
1579 /* Count notes sections and allocate structures. */
1581 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1582 if (!sect_empty(&info
->sechdrs
[i
]) &&
1583 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1589 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1590 + notes
* sizeof(notes_attrs
->attrs
[0]),
1592 if (notes_attrs
== NULL
)
1595 notes_attrs
->notes
= notes
;
1596 nattr
= ¬es_attrs
->attrs
[0];
1597 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1598 if (sect_empty(&info
->sechdrs
[i
]))
1600 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1601 sysfs_bin_attr_init(nattr
);
1602 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1603 nattr
->attr
.mode
= S_IRUGO
;
1604 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1605 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1606 nattr
->read
= module_notes_read
;
1612 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1613 if (!notes_attrs
->dir
)
1616 for (i
= 0; i
< notes
; ++i
)
1617 if (sysfs_create_bin_file(notes_attrs
->dir
,
1618 ¬es_attrs
->attrs
[i
]))
1621 mod
->notes_attrs
= notes_attrs
;
1625 free_notes_attrs(notes_attrs
, i
);
1628 static void remove_notes_attrs(struct module
*mod
)
1630 if (mod
->notes_attrs
)
1631 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1636 static inline void add_sect_attrs(struct module
*mod
,
1637 const struct load_info
*info
)
1641 static inline void remove_sect_attrs(struct module
*mod
)
1645 static inline void add_notes_attrs(struct module
*mod
,
1646 const struct load_info
*info
)
1650 static inline void remove_notes_attrs(struct module
*mod
)
1653 #endif /* CONFIG_KALLSYMS */
1655 static void add_usage_links(struct module
*mod
)
1657 #ifdef CONFIG_MODULE_UNLOAD
1658 struct module_use
*use
;
1661 mutex_lock(&module_mutex
);
1662 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1663 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1664 &mod
->mkobj
.kobj
, mod
->name
);
1666 mutex_unlock(&module_mutex
);
1670 static void del_usage_links(struct module
*mod
)
1672 #ifdef CONFIG_MODULE_UNLOAD
1673 struct module_use
*use
;
1675 mutex_lock(&module_mutex
);
1676 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1677 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1678 mutex_unlock(&module_mutex
);
1682 static int module_add_modinfo_attrs(struct module
*mod
)
1684 struct module_attribute
*attr
;
1685 struct module_attribute
*temp_attr
;
1689 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1690 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1692 if (!mod
->modinfo_attrs
)
1695 temp_attr
= mod
->modinfo_attrs
;
1696 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1698 (attr
->test
&& attr
->test(mod
))) {
1699 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1700 sysfs_attr_init(&temp_attr
->attr
);
1701 error
= sysfs_create_file(&mod
->mkobj
.kobj
,
1709 static void module_remove_modinfo_attrs(struct module
*mod
)
1711 struct module_attribute
*attr
;
1714 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1715 /* pick a field to test for end of list */
1716 if (!attr
->attr
.name
)
1718 sysfs_remove_file(&mod
->mkobj
.kobj
, &attr
->attr
);
1722 kfree(mod
->modinfo_attrs
);
1725 static void mod_kobject_put(struct module
*mod
)
1727 DECLARE_COMPLETION_ONSTACK(c
);
1728 mod
->mkobj
.kobj_completion
= &c
;
1729 kobject_put(&mod
->mkobj
.kobj
);
1730 wait_for_completion(&c
);
1733 static int mod_sysfs_init(struct module
*mod
)
1736 struct kobject
*kobj
;
1738 if (!module_sysfs_initialized
) {
1739 pr_err("%s: module sysfs not initialized\n", mod
->name
);
1744 kobj
= kset_find_obj(module_kset
, mod
->name
);
1746 pr_err("%s: module is already loaded\n", mod
->name
);
1752 mod
->mkobj
.mod
= mod
;
1754 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1755 mod
->mkobj
.kobj
.kset
= module_kset
;
1756 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1759 mod_kobject_put(mod
);
1761 /* delay uevent until full sysfs population */
1766 static int mod_sysfs_setup(struct module
*mod
,
1767 const struct load_info
*info
,
1768 struct kernel_param
*kparam
,
1769 unsigned int num_params
)
1773 err
= mod_sysfs_init(mod
);
1777 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1778 if (!mod
->holders_dir
) {
1783 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1785 goto out_unreg_holders
;
1787 err
= module_add_modinfo_attrs(mod
);
1789 goto out_unreg_param
;
1791 add_usage_links(mod
);
1792 add_sect_attrs(mod
, info
);
1793 add_notes_attrs(mod
, info
);
1795 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1799 module_param_sysfs_remove(mod
);
1801 kobject_put(mod
->holders_dir
);
1803 mod_kobject_put(mod
);
1808 static void mod_sysfs_fini(struct module
*mod
)
1810 remove_notes_attrs(mod
);
1811 remove_sect_attrs(mod
);
1812 mod_kobject_put(mod
);
1815 static void init_param_lock(struct module
*mod
)
1817 mutex_init(&mod
->param_lock
);
1819 #else /* !CONFIG_SYSFS */
1821 static int mod_sysfs_setup(struct module
*mod
,
1822 const struct load_info
*info
,
1823 struct kernel_param
*kparam
,
1824 unsigned int num_params
)
1829 static void mod_sysfs_fini(struct module
*mod
)
1833 static void module_remove_modinfo_attrs(struct module
*mod
)
1837 static void del_usage_links(struct module
*mod
)
1841 static void init_param_lock(struct module
*mod
)
1844 #endif /* CONFIG_SYSFS */
1846 static void mod_sysfs_teardown(struct module
*mod
)
1848 del_usage_links(mod
);
1849 module_remove_modinfo_attrs(mod
);
1850 module_param_sysfs_remove(mod
);
1851 kobject_put(mod
->mkobj
.drivers_dir
);
1852 kobject_put(mod
->holders_dir
);
1853 mod_sysfs_fini(mod
);
1856 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1858 * LKM RO/NX protection: protect module's text/ro-data
1859 * from modification and any data from execution.
1861 * General layout of module is:
1862 * [text] [read-only-data] [writable data]
1863 * text_size -----^ ^ ^
1864 * ro_size ------------------------| |
1865 * size -------------------------------------------|
1867 * These values are always page-aligned (as is base)
1869 static void frob_text(const struct module_layout
*layout
,
1870 int (*set_memory
)(unsigned long start
, int num_pages
))
1872 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1873 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1874 set_memory((unsigned long)layout
->base
,
1875 layout
->text_size
>> PAGE_SHIFT
);
1878 static void frob_rodata(const struct module_layout
*layout
,
1879 int (*set_memory
)(unsigned long start
, int num_pages
))
1881 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1882 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1883 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1884 set_memory((unsigned long)layout
->base
+ layout
->text_size
,
1885 (layout
->ro_size
- layout
->text_size
) >> PAGE_SHIFT
);
1888 static void frob_writable_data(const struct module_layout
*layout
,
1889 int (*set_memory
)(unsigned long start
, int num_pages
))
1891 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1892 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1893 BUG_ON((unsigned long)layout
->size
& (PAGE_SIZE
-1));
1894 set_memory((unsigned long)layout
->base
+ layout
->ro_size
,
1895 (layout
->size
- layout
->ro_size
) >> PAGE_SHIFT
);
1898 /* livepatching wants to disable read-only so it can frob module. */
1899 void module_disable_ro(const struct module
*mod
)
1901 frob_text(&mod
->core_layout
, set_memory_rw
);
1902 frob_rodata(&mod
->core_layout
, set_memory_rw
);
1903 frob_text(&mod
->init_layout
, set_memory_rw
);
1904 frob_rodata(&mod
->init_layout
, set_memory_rw
);
1907 void module_enable_ro(const struct module
*mod
)
1909 frob_text(&mod
->core_layout
, set_memory_ro
);
1910 frob_rodata(&mod
->core_layout
, set_memory_ro
);
1911 frob_text(&mod
->init_layout
, set_memory_ro
);
1912 frob_rodata(&mod
->init_layout
, set_memory_ro
);
1915 static void module_enable_nx(const struct module
*mod
)
1917 frob_rodata(&mod
->core_layout
, set_memory_nx
);
1918 frob_writable_data(&mod
->core_layout
, set_memory_nx
);
1919 frob_rodata(&mod
->init_layout
, set_memory_nx
);
1920 frob_writable_data(&mod
->init_layout
, set_memory_nx
);
1923 static void module_disable_nx(const struct module
*mod
)
1925 frob_rodata(&mod
->core_layout
, set_memory_x
);
1926 frob_writable_data(&mod
->core_layout
, set_memory_x
);
1927 frob_rodata(&mod
->init_layout
, set_memory_x
);
1928 frob_writable_data(&mod
->init_layout
, set_memory_x
);
1931 /* Iterate through all modules and set each module's text as RW */
1932 void set_all_modules_text_rw(void)
1936 mutex_lock(&module_mutex
);
1937 list_for_each_entry_rcu(mod
, &modules
, list
) {
1938 if (mod
->state
== MODULE_STATE_UNFORMED
)
1941 frob_text(&mod
->core_layout
, set_memory_rw
);
1942 frob_text(&mod
->init_layout
, set_memory_rw
);
1944 mutex_unlock(&module_mutex
);
1947 /* Iterate through all modules and set each module's text as RO */
1948 void set_all_modules_text_ro(void)
1952 mutex_lock(&module_mutex
);
1953 list_for_each_entry_rcu(mod
, &modules
, list
) {
1954 if (mod
->state
== MODULE_STATE_UNFORMED
)
1957 frob_text(&mod
->core_layout
, set_memory_ro
);
1958 frob_text(&mod
->init_layout
, set_memory_ro
);
1960 mutex_unlock(&module_mutex
);
1963 static void disable_ro_nx(const struct module_layout
*layout
)
1965 frob_text(layout
, set_memory_rw
);
1966 frob_rodata(layout
, set_memory_rw
);
1967 frob_rodata(layout
, set_memory_x
);
1968 frob_writable_data(layout
, set_memory_x
);
1972 static void disable_ro_nx(const struct module_layout
*layout
) { }
1973 static void module_enable_nx(const struct module
*mod
) { }
1974 static void module_disable_nx(const struct module
*mod
) { }
1977 #ifdef CONFIG_LIVEPATCH
1979 * Persist Elf information about a module. Copy the Elf header,
1980 * section header table, section string table, and symtab section
1981 * index from info to mod->klp_info.
1983 static int copy_module_elf(struct module
*mod
, struct load_info
*info
)
1985 unsigned int size
, symndx
;
1988 size
= sizeof(*mod
->klp_info
);
1989 mod
->klp_info
= kmalloc(size
, GFP_KERNEL
);
1990 if (mod
->klp_info
== NULL
)
1994 size
= sizeof(mod
->klp_info
->hdr
);
1995 memcpy(&mod
->klp_info
->hdr
, info
->hdr
, size
);
1997 /* Elf section header table */
1998 size
= sizeof(*info
->sechdrs
) * info
->hdr
->e_shnum
;
1999 mod
->klp_info
->sechdrs
= kmalloc(size
, GFP_KERNEL
);
2000 if (mod
->klp_info
->sechdrs
== NULL
) {
2004 memcpy(mod
->klp_info
->sechdrs
, info
->sechdrs
, size
);
2006 /* Elf section name string table */
2007 size
= info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_size
;
2008 mod
->klp_info
->secstrings
= kmalloc(size
, GFP_KERNEL
);
2009 if (mod
->klp_info
->secstrings
== NULL
) {
2013 memcpy(mod
->klp_info
->secstrings
, info
->secstrings
, size
);
2015 /* Elf symbol section index */
2016 symndx
= info
->index
.sym
;
2017 mod
->klp_info
->symndx
= symndx
;
2020 * For livepatch modules, core_kallsyms.symtab is a complete
2021 * copy of the original symbol table. Adjust sh_addr to point
2022 * to core_kallsyms.symtab since the copy of the symtab in module
2023 * init memory is freed at the end of do_init_module().
2025 mod
->klp_info
->sechdrs
[symndx
].sh_addr
= \
2026 (unsigned long) mod
->core_kallsyms
.symtab
;
2031 kfree(mod
->klp_info
->sechdrs
);
2033 kfree(mod
->klp_info
);
2037 static void free_module_elf(struct module
*mod
)
2039 kfree(mod
->klp_info
->sechdrs
);
2040 kfree(mod
->klp_info
->secstrings
);
2041 kfree(mod
->klp_info
);
2043 #else /* !CONFIG_LIVEPATCH */
2044 static int copy_module_elf(struct module
*mod
, struct load_info
*info
)
2049 static void free_module_elf(struct module
*mod
)
2052 #endif /* CONFIG_LIVEPATCH */
2054 void __weak
module_memfree(void *module_region
)
2056 vfree(module_region
);
2059 void __weak
module_arch_cleanup(struct module
*mod
)
2063 void __weak
module_arch_freeing_init(struct module
*mod
)
2067 /* Free a module, remove from lists, etc. */
2068 static void free_module(struct module
*mod
)
2070 trace_module_free(mod
);
2072 mod_sysfs_teardown(mod
);
2074 /* We leave it in list to prevent duplicate loads, but make sure
2075 * that noone uses it while it's being deconstructed. */
2076 mutex_lock(&module_mutex
);
2077 mod
->state
= MODULE_STATE_UNFORMED
;
2078 mutex_unlock(&module_mutex
);
2080 /* Remove dynamic debug info */
2081 ddebug_remove_module(mod
->name
);
2083 /* Arch-specific cleanup. */
2084 module_arch_cleanup(mod
);
2086 /* Module unload stuff */
2087 module_unload_free(mod
);
2089 /* Free any allocated parameters. */
2090 destroy_params(mod
->kp
, mod
->num_kp
);
2092 if (is_livepatch_module(mod
))
2093 free_module_elf(mod
);
2095 /* Now we can delete it from the lists */
2096 mutex_lock(&module_mutex
);
2097 /* Unlink carefully: kallsyms could be walking list. */
2098 list_del_rcu(&mod
->list
);
2099 mod_tree_remove(mod
);
2100 /* Remove this module from bug list, this uses list_del_rcu */
2101 module_bug_cleanup(mod
);
2102 /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */
2103 synchronize_sched();
2104 mutex_unlock(&module_mutex
);
2106 /* This may be empty, but that's OK */
2107 disable_ro_nx(&mod
->init_layout
);
2108 module_arch_freeing_init(mod
);
2109 module_memfree(mod
->init_layout
.base
);
2111 percpu_modfree(mod
);
2113 /* Free lock-classes; relies on the preceding sync_rcu(). */
2114 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
2116 /* Finally, free the core (containing the module structure) */
2117 disable_ro_nx(&mod
->core_layout
);
2118 module_memfree(mod
->core_layout
.base
);
2121 update_protections(current
->mm
);
2125 void *__symbol_get(const char *symbol
)
2127 struct module
*owner
;
2128 const struct kernel_symbol
*sym
;
2131 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
2132 if (sym
&& strong_try_module_get(owner
))
2136 return sym
? (void *)sym
->value
: NULL
;
2138 EXPORT_SYMBOL_GPL(__symbol_get
);
2141 * Ensure that an exported symbol [global namespace] does not already exist
2142 * in the kernel or in some other module's exported symbol table.
2144 * You must hold the module_mutex.
2146 static int verify_export_symbols(struct module
*mod
)
2149 struct module
*owner
;
2150 const struct kernel_symbol
*s
;
2152 const struct kernel_symbol
*sym
;
2155 { mod
->syms
, mod
->num_syms
},
2156 { mod
->gpl_syms
, mod
->num_gpl_syms
},
2157 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
2158 #ifdef CONFIG_UNUSED_SYMBOLS
2159 { mod
->unused_syms
, mod
->num_unused_syms
},
2160 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
2164 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
2165 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
2166 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
2167 pr_err("%s: exports duplicate symbol %s"
2169 mod
->name
, s
->name
, module_name(owner
));
2177 /* Change all symbols so that st_value encodes the pointer directly. */
2178 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
2180 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2181 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
2182 unsigned long secbase
;
2185 const struct kernel_symbol
*ksym
;
2187 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
2188 const char *name
= info
->strtab
+ sym
[i
].st_name
;
2190 switch (sym
[i
].st_shndx
) {
2192 /* Ignore common symbols */
2193 if (!strncmp(name
, "__gnu_lto", 9))
2196 /* We compiled with -fno-common. These are not
2197 supposed to happen. */
2198 pr_debug("Common symbol: %s\n", name
);
2199 pr_warn("%s: please compile with -fno-common\n",
2205 /* Don't need to do anything */
2206 pr_debug("Absolute symbol: 0x%08lx\n",
2207 (long)sym
[i
].st_value
);
2211 /* Livepatch symbols are resolved by livepatch */
2215 ksym
= resolve_symbol_wait(mod
, info
, name
);
2216 /* Ok if resolved. */
2217 if (ksym
&& !IS_ERR(ksym
)) {
2218 sym
[i
].st_value
= ksym
->value
;
2223 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
2226 pr_warn("%s: Unknown symbol %s (err %li)\n",
2227 mod
->name
, name
, PTR_ERR(ksym
));
2228 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
2232 /* Divert to percpu allocation if a percpu var. */
2233 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
2234 secbase
= (unsigned long)mod_percpu(mod
);
2236 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
2237 sym
[i
].st_value
+= secbase
;
2245 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
2250 /* Now do relocations. */
2251 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2252 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2254 /* Not a valid relocation section? */
2255 if (infosec
>= info
->hdr
->e_shnum
)
2258 /* Don't bother with non-allocated sections */
2259 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2262 /* Livepatch relocation sections are applied by livepatch */
2263 if (info
->sechdrs
[i
].sh_flags
& SHF_RELA_LIVEPATCH
)
2266 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2267 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2268 info
->index
.sym
, i
, mod
);
2269 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2270 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2271 info
->index
.sym
, i
, mod
);
2278 /* Additional bytes needed by arch in front of individual sections */
2279 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2280 unsigned int section
)
2282 /* default implementation just returns zero */
2286 /* Update size with this section: return offset. */
2287 static long get_offset(struct module
*mod
, unsigned int *size
,
2288 Elf_Shdr
*sechdr
, unsigned int section
)
2292 *size
+= arch_mod_section_prepend(mod
, section
);
2293 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2294 *size
= ret
+ sechdr
->sh_size
;
2298 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2299 might -- code, read-only data, read-write data, small data. Tally
2300 sizes, and place the offsets into sh_entsize fields: high bit means it
2302 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2304 static unsigned long const masks
[][2] = {
2305 /* NOTE: all executable code must be the first section
2306 * in this array; otherwise modify the text_size
2307 * finder in the two loops below */
2308 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2309 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2310 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2311 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2315 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2316 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2318 pr_debug("Core section allocation order:\n");
2319 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2320 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2321 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2322 const char *sname
= info
->secstrings
+ s
->sh_name
;
2324 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2325 || (s
->sh_flags
& masks
[m
][1])
2326 || s
->sh_entsize
!= ~0UL
2327 || strstarts(sname
, ".init"))
2329 s
->sh_entsize
= get_offset(mod
, &mod
->core_layout
.size
, s
, i
);
2330 pr_debug("\t%s\n", sname
);
2333 case 0: /* executable */
2334 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2335 mod
->core_layout
.text_size
= mod
->core_layout
.size
;
2337 case 1: /* RO: text and ro-data */
2338 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2339 mod
->core_layout
.ro_size
= mod
->core_layout
.size
;
2341 case 3: /* whole core */
2342 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2347 pr_debug("Init section allocation order:\n");
2348 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2349 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2350 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2351 const char *sname
= info
->secstrings
+ s
->sh_name
;
2353 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2354 || (s
->sh_flags
& masks
[m
][1])
2355 || s
->sh_entsize
!= ~0UL
2356 || !strstarts(sname
, ".init"))
2358 s
->sh_entsize
= (get_offset(mod
, &mod
->init_layout
.size
, s
, i
)
2359 | INIT_OFFSET_MASK
);
2360 pr_debug("\t%s\n", sname
);
2363 case 0: /* executable */
2364 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2365 mod
->init_layout
.text_size
= mod
->init_layout
.size
;
2367 case 1: /* RO: text and ro-data */
2368 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2369 mod
->init_layout
.ro_size
= mod
->init_layout
.size
;
2371 case 3: /* whole init */
2372 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2378 static void set_license(struct module
*mod
, const char *license
)
2381 license
= "unspecified";
2383 if (!license_is_gpl_compatible(license
)) {
2384 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2385 pr_warn("%s: module license '%s' taints kernel.\n",
2386 mod
->name
, license
);
2387 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2388 LOCKDEP_NOW_UNRELIABLE
);
2392 /* Parse tag=value strings from .modinfo section */
2393 static char *next_string(char *string
, unsigned long *secsize
)
2395 /* Skip non-zero chars */
2398 if ((*secsize
)-- <= 1)
2402 /* Skip any zero padding. */
2403 while (!string
[0]) {
2405 if ((*secsize
)-- <= 1)
2411 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2414 unsigned int taglen
= strlen(tag
);
2415 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2416 unsigned long size
= infosec
->sh_size
;
2418 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2419 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2420 return p
+ taglen
+ 1;
2425 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2427 struct module_attribute
*attr
;
2430 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2432 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2436 static void free_modinfo(struct module
*mod
)
2438 struct module_attribute
*attr
;
2441 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2447 #ifdef CONFIG_KALLSYMS
2449 /* lookup symbol in given range of kernel_symbols */
2450 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2451 const struct kernel_symbol
*start
,
2452 const struct kernel_symbol
*stop
)
2454 return bsearch(name
, start
, stop
- start
,
2455 sizeof(struct kernel_symbol
), cmp_name
);
2458 static int is_exported(const char *name
, unsigned long value
,
2459 const struct module
*mod
)
2461 const struct kernel_symbol
*ks
;
2463 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2465 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2466 return ks
!= NULL
&& ks
->value
== value
;
2470 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2472 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2474 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2475 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2480 if (sym
->st_shndx
== SHN_UNDEF
)
2482 if (sym
->st_shndx
== SHN_ABS
|| sym
->st_shndx
== info
->index
.pcpu
)
2484 if (sym
->st_shndx
>= SHN_LORESERVE
)
2486 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2488 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2489 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2490 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2492 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2497 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2498 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2503 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2510 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2511 unsigned int shnum
, unsigned int pcpundx
)
2513 const Elf_Shdr
*sec
;
2515 if (src
->st_shndx
== SHN_UNDEF
2516 || src
->st_shndx
>= shnum
2520 #ifdef CONFIG_KALLSYMS_ALL
2521 if (src
->st_shndx
== pcpundx
)
2525 sec
= sechdrs
+ src
->st_shndx
;
2526 if (!(sec
->sh_flags
& SHF_ALLOC
)
2527 #ifndef CONFIG_KALLSYMS_ALL
2528 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2530 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2537 * We only allocate and copy the strings needed by the parts of symtab
2538 * we keep. This is simple, but has the effect of making multiple
2539 * copies of duplicates. We could be more sophisticated, see
2540 * linux-kernel thread starting with
2541 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2543 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2545 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2546 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2548 unsigned int i
, nsrc
, ndst
, strtab_size
= 0;
2550 /* Put symbol section at end of init part of module. */
2551 symsect
->sh_flags
|= SHF_ALLOC
;
2552 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, symsect
,
2553 info
->index
.sym
) | INIT_OFFSET_MASK
;
2554 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2556 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2557 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2559 /* Compute total space required for the core symbols' strtab. */
2560 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2561 if (i
== 0 || is_livepatch_module(mod
) ||
2562 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2563 info
->index
.pcpu
)) {
2564 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2569 /* Append room for core symbols at end of core part. */
2570 info
->symoffs
= ALIGN(mod
->core_layout
.size
, symsect
->sh_addralign
?: 1);
2571 info
->stroffs
= mod
->core_layout
.size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2572 mod
->core_layout
.size
+= strtab_size
;
2573 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2575 /* Put string table section at end of init part of module. */
2576 strsect
->sh_flags
|= SHF_ALLOC
;
2577 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, strsect
,
2578 info
->index
.str
) | INIT_OFFSET_MASK
;
2579 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2581 /* We'll tack temporary mod_kallsyms on the end. */
2582 mod
->init_layout
.size
= ALIGN(mod
->init_layout
.size
,
2583 __alignof__(struct mod_kallsyms
));
2584 info
->mod_kallsyms_init_off
= mod
->init_layout
.size
;
2585 mod
->init_layout
.size
+= sizeof(struct mod_kallsyms
);
2586 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2590 * We use the full symtab and strtab which layout_symtab arranged to
2591 * be appended to the init section. Later we switch to the cut-down
2594 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2596 unsigned int i
, ndst
;
2600 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2602 /* Set up to point into init section. */
2603 mod
->kallsyms
= mod
->init_layout
.base
+ info
->mod_kallsyms_init_off
;
2605 mod
->kallsyms
->symtab
= (void *)symsec
->sh_addr
;
2606 mod
->kallsyms
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2607 /* Make sure we get permanent strtab: don't use info->strtab. */
2608 mod
->kallsyms
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2610 /* Set types up while we still have access to sections. */
2611 for (i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++)
2612 mod
->kallsyms
->symtab
[i
].st_info
2613 = elf_type(&mod
->kallsyms
->symtab
[i
], info
);
2615 /* Now populate the cut down core kallsyms for after init. */
2616 mod
->core_kallsyms
.symtab
= dst
= mod
->core_layout
.base
+ info
->symoffs
;
2617 mod
->core_kallsyms
.strtab
= s
= mod
->core_layout
.base
+ info
->stroffs
;
2618 src
= mod
->kallsyms
->symtab
;
2619 for (ndst
= i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++) {
2620 if (i
== 0 || is_livepatch_module(mod
) ||
2621 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2622 info
->index
.pcpu
)) {
2624 dst
[ndst
++].st_name
= s
- mod
->core_kallsyms
.strtab
;
2625 s
+= strlcpy(s
, &mod
->kallsyms
->strtab
[src
[i
].st_name
],
2629 mod
->core_kallsyms
.num_symtab
= ndst
;
2632 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2636 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2639 #endif /* CONFIG_KALLSYMS */
2641 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2645 #ifdef CONFIG_DYNAMIC_DEBUG
2646 if (ddebug_add_module(debug
, num
, debug
->modname
))
2647 pr_err("dynamic debug error adding module: %s\n",
2652 static void dynamic_debug_remove(struct _ddebug
*debug
)
2655 ddebug_remove_module(debug
->modname
);
2658 void * __weak
module_alloc(unsigned long size
)
2660 return vmalloc_exec(size
);
2663 #ifdef CONFIG_DEBUG_KMEMLEAK
2664 static void kmemleak_load_module(const struct module
*mod
,
2665 const struct load_info
*info
)
2669 /* only scan the sections containing data */
2670 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2672 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2673 /* Scan all writable sections that's not executable */
2674 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
2675 !(info
->sechdrs
[i
].sh_flags
& SHF_WRITE
) ||
2676 (info
->sechdrs
[i
].sh_flags
& SHF_EXECINSTR
))
2679 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2680 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2684 static inline void kmemleak_load_module(const struct module
*mod
,
2685 const struct load_info
*info
)
2690 #ifdef CONFIG_MODULE_SIG
2691 static int module_sig_check(struct load_info
*info
)
2694 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2695 const void *mod
= info
->hdr
;
2697 if (info
->len
> markerlen
&&
2698 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2699 /* We truncate the module to discard the signature */
2700 info
->len
-= markerlen
;
2701 err
= mod_verify_sig(mod
, &info
->len
);
2705 info
->sig_ok
= true;
2709 /* Not having a signature is only an error if we're strict. */
2710 if (err
== -ENOKEY
&& !sig_enforce
)
2715 #else /* !CONFIG_MODULE_SIG */
2716 static int module_sig_check(struct load_info
*info
)
2720 #endif /* !CONFIG_MODULE_SIG */
2722 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2723 static int elf_header_check(struct load_info
*info
)
2725 if (info
->len
< sizeof(*(info
->hdr
)))
2728 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2729 || info
->hdr
->e_type
!= ET_REL
2730 || !elf_check_arch(info
->hdr
)
2731 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2734 if (info
->hdr
->e_shoff
>= info
->len
2735 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2736 info
->len
- info
->hdr
->e_shoff
))
2742 #define COPY_CHUNK_SIZE (16*PAGE_SIZE)
2744 static int copy_chunked_from_user(void *dst
, const void __user
*usrc
, unsigned long len
)
2747 unsigned long n
= min(len
, COPY_CHUNK_SIZE
);
2749 if (copy_from_user(dst
, usrc
, n
) != 0)
2759 #ifdef CONFIG_LIVEPATCH
2760 static int find_livepatch_modinfo(struct module
*mod
, struct load_info
*info
)
2762 mod
->klp
= get_modinfo(info
, "livepatch") ? true : false;
2766 #else /* !CONFIG_LIVEPATCH */
2767 static int find_livepatch_modinfo(struct module
*mod
, struct load_info
*info
)
2769 if (get_modinfo(info
, "livepatch")) {
2770 pr_err("%s: module is marked as livepatch module, but livepatch support is disabled",
2777 #endif /* CONFIG_LIVEPATCH */
2779 /* Sets info->hdr and info->len. */
2780 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2781 struct load_info
*info
)
2786 if (info
->len
< sizeof(*(info
->hdr
)))
2789 err
= security_kernel_read_file(NULL
, READING_MODULE
);
2793 /* Suck in entire file: we'll want most of it. */
2794 info
->hdr
= __vmalloc(info
->len
,
2795 GFP_KERNEL
| __GFP_HIGHMEM
| __GFP_NOWARN
, PAGE_KERNEL
);
2799 if (copy_chunked_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2807 static void free_copy(struct load_info
*info
)
2812 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2816 /* This should always be true, but let's be sure. */
2817 info
->sechdrs
[0].sh_addr
= 0;
2819 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2820 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2821 if (shdr
->sh_type
!= SHT_NOBITS
2822 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2823 pr_err("Module len %lu truncated\n", info
->len
);
2827 /* Mark all sections sh_addr with their address in the
2829 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2831 #ifndef CONFIG_MODULE_UNLOAD
2832 /* Don't load .exit sections */
2833 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2834 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2838 /* Track but don't keep modinfo and version sections. */
2839 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2840 info
->index
.vers
= 0; /* Pretend no __versions section! */
2842 info
->index
.vers
= find_sec(info
, "__versions");
2843 info
->index
.info
= find_sec(info
, ".modinfo");
2844 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2845 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2850 * Set up our basic convenience variables (pointers to section headers,
2851 * search for module section index etc), and do some basic section
2854 * Return the temporary module pointer (we'll replace it with the final
2855 * one when we move the module sections around).
2857 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2863 /* Set up the convenience variables */
2864 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2865 info
->secstrings
= (void *)info
->hdr
2866 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2868 err
= rewrite_section_headers(info
, flags
);
2870 return ERR_PTR(err
);
2872 /* Find internal symbols and strings. */
2873 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2874 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2875 info
->index
.sym
= i
;
2876 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2877 info
->strtab
= (char *)info
->hdr
2878 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2883 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2884 if (!info
->index
.mod
) {
2885 pr_warn("No module found in object\n");
2886 return ERR_PTR(-ENOEXEC
);
2888 /* This is temporary: point mod into copy of data. */
2889 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2891 if (info
->index
.sym
== 0) {
2892 pr_warn("%s: module has no symbols (stripped?)\n", mod
->name
);
2893 return ERR_PTR(-ENOEXEC
);
2896 info
->index
.pcpu
= find_pcpusec(info
);
2898 /* Check module struct version now, before we try to use module. */
2899 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2900 return ERR_PTR(-ENOEXEC
);
2905 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2907 const char *modmagic
= get_modinfo(info
, "vermagic");
2910 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2913 /* This is allowed: modprobe --force will invalidate it. */
2915 err
= try_to_force_load(mod
, "bad vermagic");
2918 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2919 pr_err("%s: version magic '%s' should be '%s'\n",
2920 mod
->name
, modmagic
, vermagic
);
2924 if (!get_modinfo(info
, "intree"))
2925 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2927 if (get_modinfo(info
, "staging")) {
2928 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2929 pr_warn("%s: module is from the staging directory, the quality "
2930 "is unknown, you have been warned.\n", mod
->name
);
2933 err
= find_livepatch_modinfo(mod
, info
);
2937 /* Set up license info based on the info section */
2938 set_license(mod
, get_modinfo(info
, "license"));
2943 static int find_module_sections(struct module
*mod
, struct load_info
*info
)
2945 mod
->kp
= section_objs(info
, "__param",
2946 sizeof(*mod
->kp
), &mod
->num_kp
);
2947 mod
->syms
= section_objs(info
, "__ksymtab",
2948 sizeof(*mod
->syms
), &mod
->num_syms
);
2949 mod
->crcs
= section_addr(info
, "__kcrctab");
2950 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
2951 sizeof(*mod
->gpl_syms
),
2952 &mod
->num_gpl_syms
);
2953 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
2954 mod
->gpl_future_syms
= section_objs(info
,
2955 "__ksymtab_gpl_future",
2956 sizeof(*mod
->gpl_future_syms
),
2957 &mod
->num_gpl_future_syms
);
2958 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
2960 #ifdef CONFIG_UNUSED_SYMBOLS
2961 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
2962 sizeof(*mod
->unused_syms
),
2963 &mod
->num_unused_syms
);
2964 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
2965 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
2966 sizeof(*mod
->unused_gpl_syms
),
2967 &mod
->num_unused_gpl_syms
);
2968 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
2970 #ifdef CONFIG_CONSTRUCTORS
2971 mod
->ctors
= section_objs(info
, ".ctors",
2972 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2974 mod
->ctors
= section_objs(info
, ".init_array",
2975 sizeof(*mod
->ctors
), &mod
->num_ctors
);
2976 else if (find_sec(info
, ".init_array")) {
2978 * This shouldn't happen with same compiler and binutils
2979 * building all parts of the module.
2981 pr_warn("%s: has both .ctors and .init_array.\n",
2987 #ifdef CONFIG_TRACEPOINTS
2988 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
2989 sizeof(*mod
->tracepoints_ptrs
),
2990 &mod
->num_tracepoints
);
2992 #ifdef HAVE_JUMP_LABEL
2993 mod
->jump_entries
= section_objs(info
, "__jump_table",
2994 sizeof(*mod
->jump_entries
),
2995 &mod
->num_jump_entries
);
2997 #ifdef CONFIG_EVENT_TRACING
2998 mod
->trace_events
= section_objs(info
, "_ftrace_events",
2999 sizeof(*mod
->trace_events
),
3000 &mod
->num_trace_events
);
3001 mod
->trace_enums
= section_objs(info
, "_ftrace_enum_map",
3002 sizeof(*mod
->trace_enums
),
3003 &mod
->num_trace_enums
);
3005 #ifdef CONFIG_TRACING
3006 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
3007 sizeof(*mod
->trace_bprintk_fmt_start
),
3008 &mod
->num_trace_bprintk_fmt
);
3010 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
3011 /* sechdrs[0].sh_size is always zero */
3012 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
3013 sizeof(*mod
->ftrace_callsites
),
3014 &mod
->num_ftrace_callsites
);
3017 mod
->extable
= section_objs(info
, "__ex_table",
3018 sizeof(*mod
->extable
), &mod
->num_exentries
);
3020 if (section_addr(info
, "__obsparm"))
3021 pr_warn("%s: Ignoring obsolete parameters\n", mod
->name
);
3023 info
->debug
= section_objs(info
, "__verbose",
3024 sizeof(*info
->debug
), &info
->num_debug
);
3029 static int move_module(struct module
*mod
, struct load_info
*info
)
3034 /* Do the allocs. */
3035 ptr
= module_alloc(mod
->core_layout
.size
);
3037 * The pointer to this block is stored in the module structure
3038 * which is inside the block. Just mark it as not being a
3041 kmemleak_not_leak(ptr
);
3045 memset(ptr
, 0, mod
->core_layout
.size
);
3046 mod
->core_layout
.base
= ptr
;
3048 if (mod
->init_layout
.size
) {
3049 ptr
= module_alloc(mod
->init_layout
.size
);
3051 * The pointer to this block is stored in the module structure
3052 * which is inside the block. This block doesn't need to be
3053 * scanned as it contains data and code that will be freed
3054 * after the module is initialized.
3056 kmemleak_ignore(ptr
);
3058 module_memfree(mod
->core_layout
.base
);
3061 memset(ptr
, 0, mod
->init_layout
.size
);
3062 mod
->init_layout
.base
= ptr
;
3064 mod
->init_layout
.base
= NULL
;
3066 /* Transfer each section which specifies SHF_ALLOC */
3067 pr_debug("final section addresses:\n");
3068 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
3070 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
3072 if (!(shdr
->sh_flags
& SHF_ALLOC
))
3075 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
3076 dest
= mod
->init_layout
.base
3077 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
3079 dest
= mod
->core_layout
.base
+ shdr
->sh_entsize
;
3081 if (shdr
->sh_type
!= SHT_NOBITS
)
3082 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
3083 /* Update sh_addr to point to copy in image. */
3084 shdr
->sh_addr
= (unsigned long)dest
;
3085 pr_debug("\t0x%lx %s\n",
3086 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
3092 static int check_module_license_and_versions(struct module
*mod
)
3095 * ndiswrapper is under GPL by itself, but loads proprietary modules.
3096 * Don't use add_taint_module(), as it would prevent ndiswrapper from
3097 * using GPL-only symbols it needs.
3099 if (strcmp(mod
->name
, "ndiswrapper") == 0)
3100 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
3102 /* driverloader was caught wrongly pretending to be under GPL */
3103 if (strcmp(mod
->name
, "driverloader") == 0)
3104 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3105 LOCKDEP_NOW_UNRELIABLE
);
3107 /* lve claims to be GPL but upstream won't provide source */
3108 if (strcmp(mod
->name
, "lve") == 0)
3109 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3110 LOCKDEP_NOW_UNRELIABLE
);
3112 #ifdef CONFIG_MODVERSIONS
3113 if ((mod
->num_syms
&& !mod
->crcs
)
3114 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
3115 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
3116 #ifdef CONFIG_UNUSED_SYMBOLS
3117 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
3118 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
3121 return try_to_force_load(mod
,
3122 "no versions for exported symbols");
3128 static void flush_module_icache(const struct module
*mod
)
3130 mm_segment_t old_fs
;
3132 /* flush the icache in correct context */
3137 * Flush the instruction cache, since we've played with text.
3138 * Do it before processing of module parameters, so the module
3139 * can provide parameter accessor functions of its own.
3141 if (mod
->init_layout
.base
)
3142 flush_icache_range((unsigned long)mod
->init_layout
.base
,
3143 (unsigned long)mod
->init_layout
.base
3144 + mod
->init_layout
.size
);
3145 flush_icache_range((unsigned long)mod
->core_layout
.base
,
3146 (unsigned long)mod
->core_layout
.base
+ mod
->core_layout
.size
);
3151 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
3159 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
3161 /* Module within temporary copy. */
3165 mod
= setup_load_info(info
, flags
);
3169 err
= check_modinfo(mod
, info
, flags
);
3171 return ERR_PTR(err
);
3173 /* Allow arches to frob section contents and sizes. */
3174 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
3175 info
->secstrings
, mod
);
3177 return ERR_PTR(err
);
3179 /* We will do a special allocation for per-cpu sections later. */
3180 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
3182 /* Determine total sizes, and put offsets in sh_entsize. For now
3183 this is done generically; there doesn't appear to be any
3184 special cases for the architectures. */
3185 layout_sections(mod
, info
);
3186 layout_symtab(mod
, info
);
3188 /* Allocate and move to the final place */
3189 err
= move_module(mod
, info
);
3191 return ERR_PTR(err
);
3193 /* Module has been copied to its final place now: return it. */
3194 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
3195 kmemleak_load_module(mod
, info
);
3199 /* mod is no longer valid after this! */
3200 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
3202 percpu_modfree(mod
);
3203 module_arch_freeing_init(mod
);
3204 module_memfree(mod
->init_layout
.base
);
3205 module_memfree(mod
->core_layout
.base
);
3208 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
3209 const Elf_Shdr
*sechdrs
,
3215 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
3217 /* Sort exception table now relocations are done. */
3218 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
3220 /* Copy relocated percpu area over. */
3221 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
3222 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
3224 /* Setup kallsyms-specific fields. */
3225 add_kallsyms(mod
, info
);
3227 /* Arch-specific module finalizing. */
3228 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3231 /* Is this module of this name done loading? No locks held. */
3232 static bool finished_loading(const char *name
)
3238 * The module_mutex should not be a heavily contended lock;
3239 * if we get the occasional sleep here, we'll go an extra iteration
3240 * in the wait_event_interruptible(), which is harmless.
3242 sched_annotate_sleep();
3243 mutex_lock(&module_mutex
);
3244 mod
= find_module_all(name
, strlen(name
), true);
3245 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3246 || mod
->state
== MODULE_STATE_GOING
;
3247 mutex_unlock(&module_mutex
);
3252 /* Call module constructors. */
3253 static void do_mod_ctors(struct module
*mod
)
3255 #ifdef CONFIG_CONSTRUCTORS
3258 for (i
= 0; i
< mod
->num_ctors
; i
++)
3263 /* For freeing module_init on success, in case kallsyms traversing */
3264 struct mod_initfree
{
3265 struct rcu_head rcu
;
3269 static void do_free_init(struct rcu_head
*head
)
3271 struct mod_initfree
*m
= container_of(head
, struct mod_initfree
, rcu
);
3272 module_memfree(m
->module_init
);
3277 * This is where the real work happens.
3279 * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
3280 * helper command 'lx-symbols'.
3282 static noinline
int do_init_module(struct module
*mod
)
3285 struct mod_initfree
*freeinit
;
3287 freeinit
= kmalloc(sizeof(*freeinit
), GFP_KERNEL
);
3292 freeinit
->module_init
= mod
->init_layout
.base
;
3295 * We want to find out whether @mod uses async during init. Clear
3296 * PF_USED_ASYNC. async_schedule*() will set it.
3298 current
->flags
&= ~PF_USED_ASYNC
;
3301 /* Start the module */
3302 if (mod
->init
!= NULL
)
3303 ret
= do_one_initcall(mod
->init
);
3305 goto fail_free_freeinit
;
3308 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3309 "follow 0/-E convention\n"
3310 "%s: loading module anyway...\n",
3311 __func__
, mod
->name
, ret
, __func__
);
3315 /* Now it's a first class citizen! */
3316 mod
->state
= MODULE_STATE_LIVE
;
3317 blocking_notifier_call_chain(&module_notify_list
,
3318 MODULE_STATE_LIVE
, mod
);
3321 * We need to finish all async code before the module init sequence
3322 * is done. This has potential to deadlock. For example, a newly
3323 * detected block device can trigger request_module() of the
3324 * default iosched from async probing task. Once userland helper
3325 * reaches here, async_synchronize_full() will wait on the async
3326 * task waiting on request_module() and deadlock.
3328 * This deadlock is avoided by perfomring async_synchronize_full()
3329 * iff module init queued any async jobs. This isn't a full
3330 * solution as it will deadlock the same if module loading from
3331 * async jobs nests more than once; however, due to the various
3332 * constraints, this hack seems to be the best option for now.
3333 * Please refer to the following thread for details.
3335 * http://thread.gmane.org/gmane.linux.kernel/1420814
3337 if (!mod
->async_probe_requested
&& (current
->flags
& PF_USED_ASYNC
))
3338 async_synchronize_full();
3340 mutex_lock(&module_mutex
);
3341 /* Drop initial reference. */
3343 trim_init_extable(mod
);
3344 #ifdef CONFIG_KALLSYMS
3345 /* Switch to core kallsyms now init is done: kallsyms may be walking! */
3346 rcu_assign_pointer(mod
->kallsyms
, &mod
->core_kallsyms
);
3348 mod_tree_remove_init(mod
);
3349 disable_ro_nx(&mod
->init_layout
);
3350 module_arch_freeing_init(mod
);
3351 mod
->init_layout
.base
= NULL
;
3352 mod
->init_layout
.size
= 0;
3353 mod
->init_layout
.ro_size
= 0;
3354 mod
->init_layout
.text_size
= 0;
3356 * We want to free module_init, but be aware that kallsyms may be
3357 * walking this with preempt disabled. In all the failure paths, we
3358 * call synchronize_sched(), but we don't want to slow down the success
3359 * path, so use actual RCU here.
3361 call_rcu_sched(&freeinit
->rcu
, do_free_init
);
3362 mutex_unlock(&module_mutex
);
3363 wake_up_all(&module_wq
);
3370 /* Try to protect us from buggy refcounters. */
3371 mod
->state
= MODULE_STATE_GOING
;
3372 synchronize_sched();
3374 blocking_notifier_call_chain(&module_notify_list
,
3375 MODULE_STATE_GOING
, mod
);
3376 klp_module_going(mod
);
3377 ftrace_release_mod(mod
);
3379 wake_up_all(&module_wq
);
3383 static int may_init_module(void)
3385 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3392 * We try to place it in the list now to make sure it's unique before
3393 * we dedicate too many resources. In particular, temporary percpu
3394 * memory exhaustion.
3396 static int add_unformed_module(struct module
*mod
)
3401 mod
->state
= MODULE_STATE_UNFORMED
;
3404 mutex_lock(&module_mutex
);
3405 old
= find_module_all(mod
->name
, strlen(mod
->name
), true);
3407 if (old
->state
== MODULE_STATE_COMING
3408 || old
->state
== MODULE_STATE_UNFORMED
) {
3409 /* Wait in case it fails to load. */
3410 mutex_unlock(&module_mutex
);
3411 err
= wait_event_interruptible(module_wq
,
3412 finished_loading(mod
->name
));
3420 mod_update_bounds(mod
);
3421 list_add_rcu(&mod
->list
, &modules
);
3422 mod_tree_insert(mod
);
3426 mutex_unlock(&module_mutex
);
3431 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3435 mutex_lock(&module_mutex
);
3437 /* Find duplicate symbols (must be called under lock). */
3438 err
= verify_export_symbols(mod
);
3442 /* This relies on module_mutex for list integrity. */
3443 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3445 /* Set RO and NX regions */
3446 module_enable_ro(mod
);
3447 module_enable_nx(mod
);
3449 /* Mark state as coming so strong_try_module_get() ignores us,
3450 * but kallsyms etc. can see us. */
3451 mod
->state
= MODULE_STATE_COMING
;
3452 mutex_unlock(&module_mutex
);
3457 mutex_unlock(&module_mutex
);
3461 static int prepare_coming_module(struct module
*mod
)
3465 ftrace_module_enable(mod
);
3466 err
= klp_module_coming(mod
);
3470 blocking_notifier_call_chain(&module_notify_list
,
3471 MODULE_STATE_COMING
, mod
);
3475 static int unknown_module_param_cb(char *param
, char *val
, const char *modname
,
3478 struct module
*mod
= arg
;
3481 if (strcmp(param
, "async_probe") == 0) {
3482 mod
->async_probe_requested
= true;
3486 /* Check for magic 'dyndbg' arg */
3487 ret
= ddebug_dyndbg_module_param_cb(param
, val
, modname
);
3489 pr_warn("%s: unknown parameter '%s' ignored\n", modname
, param
);
3493 /* Allocate and load the module: note that size of section 0 is always
3494 zero, and we rely on this for optional sections. */
3495 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3502 err
= module_sig_check(info
);
3506 err
= elf_header_check(info
);
3510 /* Figure out module layout, and allocate all the memory. */
3511 mod
= layout_and_allocate(info
, flags
);
3517 /* Reserve our place in the list. */
3518 err
= add_unformed_module(mod
);
3522 #ifdef CONFIG_MODULE_SIG
3523 mod
->sig_ok
= info
->sig_ok
;
3525 pr_notice_once("%s: module verification failed: signature "
3526 "and/or required key missing - tainting "
3527 "kernel\n", mod
->name
);
3528 add_taint_module(mod
, TAINT_UNSIGNED_MODULE
, LOCKDEP_STILL_OK
);
3532 /* To avoid stressing percpu allocator, do this once we're unique. */
3533 err
= percpu_modalloc(mod
, info
);
3537 /* Now module is in final location, initialize linked lists, etc. */
3538 err
= module_unload_init(mod
);
3542 init_param_lock(mod
);
3544 /* Now we've got everything in the final locations, we can
3545 * find optional sections. */
3546 err
= find_module_sections(mod
, info
);
3550 err
= check_module_license_and_versions(mod
);
3554 /* Set up MODINFO_ATTR fields */
3555 setup_modinfo(mod
, info
);
3557 /* Fix up syms, so that st_value is a pointer to location. */
3558 err
= simplify_symbols(mod
, info
);
3562 err
= apply_relocations(mod
, info
);
3566 err
= post_relocation(mod
, info
);
3570 flush_module_icache(mod
);
3572 /* Now copy in args */
3573 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3574 if (IS_ERR(mod
->args
)) {
3575 err
= PTR_ERR(mod
->args
);
3576 goto free_arch_cleanup
;
3579 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3581 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3582 ftrace_module_init(mod
);
3584 /* Finally it's fully formed, ready to start executing. */
3585 err
= complete_formation(mod
, info
);
3587 goto ddebug_cleanup
;
3589 err
= prepare_coming_module(mod
);
3593 /* Module is ready to execute: parsing args may do that. */
3594 after_dashes
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3596 unknown_module_param_cb
);
3597 if (IS_ERR(after_dashes
)) {
3598 err
= PTR_ERR(after_dashes
);
3599 goto coming_cleanup
;
3600 } else if (after_dashes
) {
3601 pr_warn("%s: parameters '%s' after `--' ignored\n",
3602 mod
->name
, after_dashes
);
3605 /* Link in to syfs. */
3606 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3608 goto coming_cleanup
;
3610 if (is_livepatch_module(mod
)) {
3611 err
= copy_module_elf(mod
, info
);
3616 /* Get rid of temporary copy. */
3620 trace_module_load(mod
);
3622 return do_init_module(mod
);
3625 mod_sysfs_teardown(mod
);
3627 blocking_notifier_call_chain(&module_notify_list
,
3628 MODULE_STATE_GOING
, mod
);
3629 klp_module_going(mod
);
3631 /* module_bug_cleanup needs module_mutex protection */
3632 mutex_lock(&module_mutex
);
3633 module_bug_cleanup(mod
);
3634 mutex_unlock(&module_mutex
);
3636 /* we can't deallocate the module until we clear memory protection */
3637 module_disable_ro(mod
);
3638 module_disable_nx(mod
);
3641 dynamic_debug_remove(info
->debug
);
3642 synchronize_sched();
3645 module_arch_cleanup(mod
);
3649 module_unload_free(mod
);
3651 mutex_lock(&module_mutex
);
3652 /* Unlink carefully: kallsyms could be walking list. */
3653 list_del_rcu(&mod
->list
);
3654 mod_tree_remove(mod
);
3655 wake_up_all(&module_wq
);
3656 /* Wait for RCU-sched synchronizing before releasing mod->list. */
3657 synchronize_sched();
3658 mutex_unlock(&module_mutex
);
3661 * Ftrace needs to clean up what it initialized.
3662 * This does nothing if ftrace_module_init() wasn't called,
3663 * but it must be called outside of module_mutex.
3665 ftrace_release_mod(mod
);
3666 /* Free lock-classes; relies on the preceding sync_rcu() */
3667 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
3669 module_deallocate(mod
, info
);
3675 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3676 unsigned long, len
, const char __user
*, uargs
)
3679 struct load_info info
= { };
3681 err
= may_init_module();
3685 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3688 err
= copy_module_from_user(umod
, len
, &info
);
3692 return load_module(&info
, uargs
, 0);
3695 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3697 struct load_info info
= { };
3702 err
= may_init_module();
3706 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3708 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3709 |MODULE_INIT_IGNORE_VERMAGIC
))
3712 err
= kernel_read_file_from_fd(fd
, &hdr
, &size
, INT_MAX
,
3719 return load_module(&info
, uargs
, flags
);
3722 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3724 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3727 #ifdef CONFIG_KALLSYMS
3729 * This ignores the intensely annoying "mapping symbols" found
3730 * in ARM ELF files: $a, $t and $d.
3732 static inline int is_arm_mapping_symbol(const char *str
)
3734 if (str
[0] == '.' && str
[1] == 'L')
3736 return str
[0] == '$' && strchr("axtd", str
[1])
3737 && (str
[2] == '\0' || str
[2] == '.');
3740 static const char *symname(struct mod_kallsyms
*kallsyms
, unsigned int symnum
)
3742 return kallsyms
->strtab
+ kallsyms
->symtab
[symnum
].st_name
;
3745 static const char *get_ksymbol(struct module
*mod
,
3747 unsigned long *size
,
3748 unsigned long *offset
)
3750 unsigned int i
, best
= 0;
3751 unsigned long nextval
;
3752 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3754 /* At worse, next value is at end of module */
3755 if (within_module_init(addr
, mod
))
3756 nextval
= (unsigned long)mod
->init_layout
.base
+mod
->init_layout
.text_size
;
3758 nextval
= (unsigned long)mod
->core_layout
.base
+mod
->core_layout
.text_size
;
3760 /* Scan for closest preceding symbol, and next symbol. (ELF
3761 starts real symbols at 1). */
3762 for (i
= 1; i
< kallsyms
->num_symtab
; i
++) {
3763 if (kallsyms
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3766 /* We ignore unnamed symbols: they're uninformative
3767 * and inserted at a whim. */
3768 if (*symname(kallsyms
, i
) == '\0'
3769 || is_arm_mapping_symbol(symname(kallsyms
, i
)))
3772 if (kallsyms
->symtab
[i
].st_value
<= addr
3773 && kallsyms
->symtab
[i
].st_value
> kallsyms
->symtab
[best
].st_value
)
3775 if (kallsyms
->symtab
[i
].st_value
> addr
3776 && kallsyms
->symtab
[i
].st_value
< nextval
)
3777 nextval
= kallsyms
->symtab
[i
].st_value
;
3784 *size
= nextval
- kallsyms
->symtab
[best
].st_value
;
3786 *offset
= addr
- kallsyms
->symtab
[best
].st_value
;
3787 return symname(kallsyms
, best
);
3790 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3791 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3792 const char *module_address_lookup(unsigned long addr
,
3793 unsigned long *size
,
3794 unsigned long *offset
,
3798 const char *ret
= NULL
;
3802 mod
= __module_address(addr
);
3805 *modname
= mod
->name
;
3806 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3808 /* Make a copy in here where it's safe */
3810 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3818 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3823 list_for_each_entry_rcu(mod
, &modules
, list
) {
3824 if (mod
->state
== MODULE_STATE_UNFORMED
)
3826 if (within_module(addr
, mod
)) {
3829 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3832 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3842 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3843 unsigned long *offset
, char *modname
, char *name
)
3848 list_for_each_entry_rcu(mod
, &modules
, list
) {
3849 if (mod
->state
== MODULE_STATE_UNFORMED
)
3851 if (within_module(addr
, mod
)) {
3854 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3858 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3860 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3870 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3871 char *name
, char *module_name
, int *exported
)
3876 list_for_each_entry_rcu(mod
, &modules
, list
) {
3877 struct mod_kallsyms
*kallsyms
;
3879 if (mod
->state
== MODULE_STATE_UNFORMED
)
3881 kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3882 if (symnum
< kallsyms
->num_symtab
) {
3883 *value
= kallsyms
->symtab
[symnum
].st_value
;
3884 *type
= kallsyms
->symtab
[symnum
].st_info
;
3885 strlcpy(name
, symname(kallsyms
, symnum
), KSYM_NAME_LEN
);
3886 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3887 *exported
= is_exported(name
, *value
, mod
);
3891 symnum
-= kallsyms
->num_symtab
;
3897 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
3900 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3902 for (i
= 0; i
< kallsyms
->num_symtab
; i
++)
3903 if (strcmp(name
, symname(kallsyms
, i
)) == 0 &&
3904 kallsyms
->symtab
[i
].st_info
!= 'U')
3905 return kallsyms
->symtab
[i
].st_value
;
3909 /* Look for this name: can be of form module:name. */
3910 unsigned long module_kallsyms_lookup_name(const char *name
)
3914 unsigned long ret
= 0;
3916 /* Don't lock: we're in enough trouble already. */
3918 if ((colon
= strchr(name
, ':')) != NULL
) {
3919 if ((mod
= find_module_all(name
, colon
- name
, false)) != NULL
)
3920 ret
= mod_find_symname(mod
, colon
+1);
3922 list_for_each_entry_rcu(mod
, &modules
, list
) {
3923 if (mod
->state
== MODULE_STATE_UNFORMED
)
3925 if ((ret
= mod_find_symname(mod
, name
)) != 0)
3933 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
3934 struct module
*, unsigned long),
3941 module_assert_mutex();
3943 list_for_each_entry(mod
, &modules
, list
) {
3944 /* We hold module_mutex: no need for rcu_dereference_sched */
3945 struct mod_kallsyms
*kallsyms
= mod
->kallsyms
;
3947 if (mod
->state
== MODULE_STATE_UNFORMED
)
3949 for (i
= 0; i
< kallsyms
->num_symtab
; i
++) {
3950 ret
= fn(data
, symname(kallsyms
, i
),
3951 mod
, kallsyms
->symtab
[i
].st_value
);
3958 #endif /* CONFIG_KALLSYMS */
3960 static char *module_flags(struct module
*mod
, char *buf
)
3964 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
3966 mod
->state
== MODULE_STATE_GOING
||
3967 mod
->state
== MODULE_STATE_COMING
) {
3969 bx
+= module_flags_taint(mod
, buf
+ bx
);
3970 /* Show a - for module-is-being-unloaded */
3971 if (mod
->state
== MODULE_STATE_GOING
)
3973 /* Show a + for module-is-being-loaded */
3974 if (mod
->state
== MODULE_STATE_COMING
)
3983 #ifdef CONFIG_PROC_FS
3984 /* Called by the /proc file system to return a list of modules. */
3985 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
3987 mutex_lock(&module_mutex
);
3988 return seq_list_start(&modules
, *pos
);
3991 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
3993 return seq_list_next(p
, &modules
, pos
);
3996 static void m_stop(struct seq_file
*m
, void *p
)
3998 mutex_unlock(&module_mutex
);
4001 static int m_show(struct seq_file
*m
, void *p
)
4003 struct module
*mod
= list_entry(p
, struct module
, list
);
4006 /* We always ignore unformed modules. */
4007 if (mod
->state
== MODULE_STATE_UNFORMED
)
4010 seq_printf(m
, "%s %u",
4011 mod
->name
, mod
->init_layout
.size
+ mod
->core_layout
.size
);
4012 print_unload_info(m
, mod
);
4014 /* Informative for users. */
4015 seq_printf(m
, " %s",
4016 mod
->state
== MODULE_STATE_GOING
? "Unloading" :
4017 mod
->state
== MODULE_STATE_COMING
? "Loading" :
4019 /* Used by oprofile and other similar tools. */
4020 seq_printf(m
, " 0x%pK", mod
->core_layout
.base
);
4024 seq_printf(m
, " %s", module_flags(mod
, buf
));
4030 /* Format: modulename size refcount deps address
4032 Where refcount is a number or -, and deps is a comma-separated list
4035 static const struct seq_operations modules_op
= {
4042 static int modules_open(struct inode
*inode
, struct file
*file
)
4044 return seq_open(file
, &modules_op
);
4047 static const struct file_operations proc_modules_operations
= {
4048 .open
= modules_open
,
4050 .llseek
= seq_lseek
,
4051 .release
= seq_release
,
4054 static int __init
proc_modules_init(void)
4056 proc_create("modules", 0, NULL
, &proc_modules_operations
);
4059 module_init(proc_modules_init
);
4062 /* Given an address, look for it in the module exception tables. */
4063 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
4065 const struct exception_table_entry
*e
= NULL
;
4069 list_for_each_entry_rcu(mod
, &modules
, list
) {
4070 if (mod
->state
== MODULE_STATE_UNFORMED
)
4072 if (mod
->num_exentries
== 0)
4075 e
= search_extable(mod
->extable
,
4076 mod
->extable
+ mod
->num_exentries
- 1,
4083 /* Now, if we found one, we are running inside it now, hence
4084 we cannot unload the module, hence no refcnt needed. */
4089 * is_module_address - is this address inside a module?
4090 * @addr: the address to check.
4092 * See is_module_text_address() if you simply want to see if the address
4093 * is code (not data).
4095 bool is_module_address(unsigned long addr
)
4100 ret
= __module_address(addr
) != NULL
;
4107 * __module_address - get the module which contains an address.
4108 * @addr: the address.
4110 * Must be called with preempt disabled or module mutex held so that
4111 * module doesn't get freed during this.
4113 struct module
*__module_address(unsigned long addr
)
4117 if (addr
< module_addr_min
|| addr
> module_addr_max
)
4120 module_assert_mutex_or_preempt();
4122 mod
= mod_find(addr
);
4124 BUG_ON(!within_module(addr
, mod
));
4125 if (mod
->state
== MODULE_STATE_UNFORMED
)
4130 EXPORT_SYMBOL_GPL(__module_address
);
4133 * is_module_text_address - is this address inside module code?
4134 * @addr: the address to check.
4136 * See is_module_address() if you simply want to see if the address is
4137 * anywhere in a module. See kernel_text_address() for testing if an
4138 * address corresponds to kernel or module code.
4140 bool is_module_text_address(unsigned long addr
)
4145 ret
= __module_text_address(addr
) != NULL
;
4152 * __module_text_address - get the module whose code contains an address.
4153 * @addr: the address.
4155 * Must be called with preempt disabled or module mutex held so that
4156 * module doesn't get freed during this.
4158 struct module
*__module_text_address(unsigned long addr
)
4160 struct module
*mod
= __module_address(addr
);
4162 /* Make sure it's within the text section. */
4163 if (!within(addr
, mod
->init_layout
.base
, mod
->init_layout
.text_size
)
4164 && !within(addr
, mod
->core_layout
.base
, mod
->core_layout
.text_size
))
4169 EXPORT_SYMBOL_GPL(__module_text_address
);
4171 /* Don't grab lock, we're oopsing. */
4172 void print_modules(void)
4177 printk(KERN_DEFAULT
"Modules linked in:");
4178 /* Most callers should already have preempt disabled, but make sure */
4180 list_for_each_entry_rcu(mod
, &modules
, list
) {
4181 if (mod
->state
== MODULE_STATE_UNFORMED
)
4183 pr_cont(" %s%s", mod
->name
, module_flags(mod
, buf
));
4186 if (last_unloaded_module
[0])
4187 pr_cont(" [last unloaded: %s]", last_unloaded_module
);
4191 #ifdef CONFIG_MODVERSIONS
4192 /* Generate the signature for all relevant module structures here.
4193 * If these change, we don't want to try to parse the module. */
4194 void module_layout(struct module
*mod
,
4195 struct modversion_info
*ver
,
4196 struct kernel_param
*kp
,
4197 struct kernel_symbol
*ks
,
4198 struct tracepoint
* const *tp
)
4201 EXPORT_SYMBOL(module_layout
);