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/extable.h>
21 #include <linux/moduleloader.h>
22 #include <linux/trace_events.h>
23 #include <linux/init.h>
24 #include <linux/kallsyms.h>
25 #include <linux/file.h>
27 #include <linux/sysfs.h>
28 #include <linux/kernel.h>
29 #include <linux/slab.h>
30 #include <linux/vmalloc.h>
31 #include <linux/elf.h>
32 #include <linux/proc_fs.h>
33 #include <linux/security.h>
34 #include <linux/seq_file.h>
35 #include <linux/syscalls.h>
36 #include <linux/fcntl.h>
37 #include <linux/rcupdate.h>
38 #include <linux/capability.h>
39 #include <linux/cpu.h>
40 #include <linux/moduleparam.h>
41 #include <linux/errno.h>
42 #include <linux/err.h>
43 #include <linux/vermagic.h>
44 #include <linux/notifier.h>
45 #include <linux/sched.h>
46 #include <linux/device.h>
47 #include <linux/string.h>
48 #include <linux/mutex.h>
49 #include <linux/rculist.h>
50 #include <linux/uaccess.h>
51 #include <asm/cacheflush.h>
52 #include <asm/mmu_context.h>
53 #include <linux/license.h>
54 #include <asm/sections.h>
55 #include <linux/tracepoint.h>
56 #include <linux/ftrace.h>
57 #include <linux/livepatch.h>
58 #include <linux/async.h>
59 #include <linux/percpu.h>
60 #include <linux/kmemleak.h>
61 #include <linux/jump_label.h>
62 #include <linux/pfn.h>
63 #include <linux/bsearch.h>
64 #include <linux/dynamic_debug.h>
65 #include <linux/audit.h>
66 #include <uapi/linux/module.h>
67 #include "module-internal.h"
69 #define CREATE_TRACE_POINTS
70 #include <trace/events/module.h>
72 #ifndef ARCH_SHF_SMALL
73 #define ARCH_SHF_SMALL 0
77 * Modules' sections will be aligned on page boundaries
78 * to ensure complete separation of code and data, but
79 * only when CONFIG_STRICT_MODULE_RWX=y
81 #ifdef CONFIG_STRICT_MODULE_RWX
82 # define debug_align(X) ALIGN(X, PAGE_SIZE)
84 # define debug_align(X) (X)
87 /* If this is set, the section belongs in the init part of the module */
88 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
92 * 1) List of modules (also safely readable with preempt_disable),
93 * 2) module_use links,
94 * 3) module_addr_min/module_addr_max.
95 * (delete and add uses RCU list operations). */
96 DEFINE_MUTEX(module_mutex
);
97 EXPORT_SYMBOL_GPL(module_mutex
);
98 static LIST_HEAD(modules
);
100 #ifdef CONFIG_MODULES_TREE_LOOKUP
103 * Use a latched RB-tree for __module_address(); this allows us to use
104 * RCU-sched lookups of the address from any context.
106 * This is conditional on PERF_EVENTS || TRACING because those can really hit
107 * __module_address() hard by doing a lot of stack unwinding; potentially from
111 static __always_inline
unsigned long __mod_tree_val(struct latch_tree_node
*n
)
113 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
115 return (unsigned long)layout
->base
;
118 static __always_inline
unsigned long __mod_tree_size(struct latch_tree_node
*n
)
120 struct module_layout
*layout
= container_of(n
, struct module_layout
, mtn
.node
);
122 return (unsigned long)layout
->size
;
125 static __always_inline
bool
126 mod_tree_less(struct latch_tree_node
*a
, struct latch_tree_node
*b
)
128 return __mod_tree_val(a
) < __mod_tree_val(b
);
131 static __always_inline
int
132 mod_tree_comp(void *key
, struct latch_tree_node
*n
)
134 unsigned long val
= (unsigned long)key
;
135 unsigned long start
, end
;
137 start
= __mod_tree_val(n
);
141 end
= start
+ __mod_tree_size(n
);
148 static const struct latch_tree_ops mod_tree_ops
= {
149 .less
= mod_tree_less
,
150 .comp
= mod_tree_comp
,
153 static struct mod_tree_root
{
154 struct latch_tree_root root
;
155 unsigned long addr_min
;
156 unsigned long addr_max
;
157 } mod_tree __cacheline_aligned
= {
161 #define module_addr_min mod_tree.addr_min
162 #define module_addr_max mod_tree.addr_max
164 static noinline
void __mod_tree_insert(struct mod_tree_node
*node
)
166 latch_tree_insert(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
169 static void __mod_tree_remove(struct mod_tree_node
*node
)
171 latch_tree_erase(&node
->node
, &mod_tree
.root
, &mod_tree_ops
);
175 * These modifications: insert, remove_init and remove; are serialized by the
178 static void mod_tree_insert(struct module
*mod
)
180 mod
->core_layout
.mtn
.mod
= mod
;
181 mod
->init_layout
.mtn
.mod
= mod
;
183 __mod_tree_insert(&mod
->core_layout
.mtn
);
184 if (mod
->init_layout
.size
)
185 __mod_tree_insert(&mod
->init_layout
.mtn
);
188 static void mod_tree_remove_init(struct module
*mod
)
190 if (mod
->init_layout
.size
)
191 __mod_tree_remove(&mod
->init_layout
.mtn
);
194 static void mod_tree_remove(struct module
*mod
)
196 __mod_tree_remove(&mod
->core_layout
.mtn
);
197 mod_tree_remove_init(mod
);
200 static struct module
*mod_find(unsigned long addr
)
202 struct latch_tree_node
*ltn
;
204 ltn
= latch_tree_find((void *)addr
, &mod_tree
.root
, &mod_tree_ops
);
208 return container_of(ltn
, struct mod_tree_node
, node
)->mod
;
211 #else /* MODULES_TREE_LOOKUP */
213 static unsigned long module_addr_min
= -1UL, module_addr_max
= 0;
215 static void mod_tree_insert(struct module
*mod
) { }
216 static void mod_tree_remove_init(struct module
*mod
) { }
217 static void mod_tree_remove(struct module
*mod
) { }
219 static struct module
*mod_find(unsigned long addr
)
223 list_for_each_entry_rcu(mod
, &modules
, list
) {
224 if (within_module(addr
, mod
))
231 #endif /* MODULES_TREE_LOOKUP */
234 * Bounds of module text, for speeding up __module_address.
235 * Protected by module_mutex.
237 static void __mod_update_bounds(void *base
, unsigned int size
)
239 unsigned long min
= (unsigned long)base
;
240 unsigned long max
= min
+ size
;
242 if (min
< module_addr_min
)
243 module_addr_min
= min
;
244 if (max
> module_addr_max
)
245 module_addr_max
= max
;
248 static void mod_update_bounds(struct module
*mod
)
250 __mod_update_bounds(mod
->core_layout
.base
, mod
->core_layout
.size
);
251 if (mod
->init_layout
.size
)
252 __mod_update_bounds(mod
->init_layout
.base
, mod
->init_layout
.size
);
255 #ifdef CONFIG_KGDB_KDB
256 struct list_head
*kdb_modules
= &modules
; /* kdb needs the list of modules */
257 #endif /* CONFIG_KGDB_KDB */
259 static void module_assert_mutex(void)
261 lockdep_assert_held(&module_mutex
);
264 static void module_assert_mutex_or_preempt(void)
266 #ifdef CONFIG_LOCKDEP
267 if (unlikely(!debug_locks
))
270 WARN_ON_ONCE(!rcu_read_lock_sched_held() &&
271 !lockdep_is_held(&module_mutex
));
275 static bool sig_enforce
= IS_ENABLED(CONFIG_MODULE_SIG_FORCE
);
276 #ifndef CONFIG_MODULE_SIG_FORCE
277 module_param(sig_enforce
, bool_enable_only
, 0644);
278 #endif /* !CONFIG_MODULE_SIG_FORCE */
280 /* Block module loading/unloading? */
281 int modules_disabled
= 0;
282 core_param(nomodule
, modules_disabled
, bint
, 0);
284 /* Waiting for a module to finish initializing? */
285 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
287 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
289 int register_module_notifier(struct notifier_block
*nb
)
291 return blocking_notifier_chain_register(&module_notify_list
, nb
);
293 EXPORT_SYMBOL(register_module_notifier
);
295 int unregister_module_notifier(struct notifier_block
*nb
)
297 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
299 EXPORT_SYMBOL(unregister_module_notifier
);
305 char *secstrings
, *strtab
;
306 unsigned long symoffs
, stroffs
;
307 struct _ddebug
*debug
;
308 unsigned int num_debug
;
310 #ifdef CONFIG_KALLSYMS
311 unsigned long mod_kallsyms_init_off
;
314 unsigned int sym
, str
, mod
, vers
, info
, pcpu
;
319 * We require a truly strong try_module_get(): 0 means success.
320 * Otherwise an error is returned due to ongoing or failed
321 * initialization etc.
323 static inline int strong_try_module_get(struct module
*mod
)
325 BUG_ON(mod
&& mod
->state
== MODULE_STATE_UNFORMED
);
326 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
328 if (try_module_get(mod
))
334 static inline void add_taint_module(struct module
*mod
, unsigned flag
,
335 enum lockdep_ok lockdep_ok
)
337 add_taint(flag
, lockdep_ok
);
338 set_bit(flag
, &mod
->taints
);
342 * A thread that wants to hold a reference to a module only while it
343 * is running can call this to safely exit. nfsd and lockd use this.
345 void __noreturn
__module_put_and_exit(struct module
*mod
, long code
)
350 EXPORT_SYMBOL(__module_put_and_exit
);
352 /* Find a module section: 0 means not found. */
353 static unsigned int find_sec(const struct load_info
*info
, const char *name
)
357 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
358 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
359 /* Alloc bit cleared means "ignore it." */
360 if ((shdr
->sh_flags
& SHF_ALLOC
)
361 && strcmp(info
->secstrings
+ shdr
->sh_name
, name
) == 0)
367 /* Find a module section, or NULL. */
368 static void *section_addr(const struct load_info
*info
, const char *name
)
370 /* Section 0 has sh_addr 0. */
371 return (void *)info
->sechdrs
[find_sec(info
, name
)].sh_addr
;
374 /* Find a module section, or NULL. Fill in number of "objects" in section. */
375 static void *section_objs(const struct load_info
*info
,
380 unsigned int sec
= find_sec(info
, name
);
382 /* Section 0 has sh_addr 0 and sh_size 0. */
383 *num
= info
->sechdrs
[sec
].sh_size
/ object_size
;
384 return (void *)info
->sechdrs
[sec
].sh_addr
;
387 /* Provided by the linker */
388 extern const struct kernel_symbol __start___ksymtab
[];
389 extern const struct kernel_symbol __stop___ksymtab
[];
390 extern const struct kernel_symbol __start___ksymtab_gpl
[];
391 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
392 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
393 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
394 extern const s32 __start___kcrctab
[];
395 extern const s32 __start___kcrctab_gpl
[];
396 extern const s32 __start___kcrctab_gpl_future
[];
397 #ifdef CONFIG_UNUSED_SYMBOLS
398 extern const struct kernel_symbol __start___ksymtab_unused
[];
399 extern const struct kernel_symbol __stop___ksymtab_unused
[];
400 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
401 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
402 extern const s32 __start___kcrctab_unused
[];
403 extern const s32 __start___kcrctab_unused_gpl
[];
406 #ifndef CONFIG_MODVERSIONS
407 #define symversion(base, idx) NULL
409 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
412 static bool each_symbol_in_section(const struct symsearch
*arr
,
413 unsigned int arrsize
,
414 struct module
*owner
,
415 bool (*fn
)(const struct symsearch
*syms
,
416 struct module
*owner
,
422 for (j
= 0; j
< arrsize
; j
++) {
423 if (fn(&arr
[j
], owner
, data
))
430 /* Returns true as soon as fn returns true, otherwise false. */
431 bool each_symbol_section(bool (*fn
)(const struct symsearch
*arr
,
432 struct module
*owner
,
437 static const struct symsearch arr
[] = {
438 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
439 NOT_GPL_ONLY
, false },
440 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
441 __start___kcrctab_gpl
,
443 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
444 __start___kcrctab_gpl_future
,
445 WILL_BE_GPL_ONLY
, false },
446 #ifdef CONFIG_UNUSED_SYMBOLS
447 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
448 __start___kcrctab_unused
,
449 NOT_GPL_ONLY
, true },
450 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
451 __start___kcrctab_unused_gpl
,
456 module_assert_mutex_or_preempt();
458 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), NULL
, fn
, data
))
461 list_for_each_entry_rcu(mod
, &modules
, list
) {
462 struct symsearch arr
[] = {
463 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
464 NOT_GPL_ONLY
, false },
465 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
468 { mod
->gpl_future_syms
,
469 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
470 mod
->gpl_future_crcs
,
471 WILL_BE_GPL_ONLY
, false },
472 #ifdef CONFIG_UNUSED_SYMBOLS
474 mod
->unused_syms
+ mod
->num_unused_syms
,
476 NOT_GPL_ONLY
, true },
477 { mod
->unused_gpl_syms
,
478 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
479 mod
->unused_gpl_crcs
,
484 if (mod
->state
== MODULE_STATE_UNFORMED
)
487 if (each_symbol_in_section(arr
, ARRAY_SIZE(arr
), mod
, fn
, data
))
492 EXPORT_SYMBOL_GPL(each_symbol_section
);
494 struct find_symbol_arg
{
501 struct module
*owner
;
503 const struct kernel_symbol
*sym
;
506 static bool check_symbol(const struct symsearch
*syms
,
507 struct module
*owner
,
508 unsigned int symnum
, void *data
)
510 struct find_symbol_arg
*fsa
= data
;
513 if (syms
->licence
== GPL_ONLY
)
515 if (syms
->licence
== WILL_BE_GPL_ONLY
&& fsa
->warn
) {
516 pr_warn("Symbol %s is being used by a non-GPL module, "
517 "which will not be allowed in the future\n",
522 #ifdef CONFIG_UNUSED_SYMBOLS
523 if (syms
->unused
&& fsa
->warn
) {
524 pr_warn("Symbol %s is marked as UNUSED, however this module is "
525 "using it.\n", fsa
->name
);
526 pr_warn("This symbol will go away in the future.\n");
527 pr_warn("Please evaluate if this is the right api to use and "
528 "if it really is, submit a report to the linux kernel "
529 "mailing list together with submitting your code for "
535 fsa
->crc
= symversion(syms
->crcs
, symnum
);
536 fsa
->sym
= &syms
->start
[symnum
];
540 static int cmp_name(const void *va
, const void *vb
)
543 const struct kernel_symbol
*b
;
545 return strcmp(a
, b
->name
);
548 static bool find_symbol_in_section(const struct symsearch
*syms
,
549 struct module
*owner
,
552 struct find_symbol_arg
*fsa
= data
;
553 struct kernel_symbol
*sym
;
555 sym
= bsearch(fsa
->name
, syms
->start
, syms
->stop
- syms
->start
,
556 sizeof(struct kernel_symbol
), cmp_name
);
558 if (sym
!= NULL
&& check_symbol(syms
, owner
, sym
- syms
->start
, data
))
564 /* Find a symbol and return it, along with, (optional) crc and
565 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
566 const struct kernel_symbol
*find_symbol(const char *name
,
567 struct module
**owner
,
572 struct find_symbol_arg fsa
;
578 if (each_symbol_section(find_symbol_in_section
, &fsa
)) {
586 pr_debug("Failed to find symbol %s\n", name
);
589 EXPORT_SYMBOL_GPL(find_symbol
);
592 * Search for module by name: must hold module_mutex (or preempt disabled
593 * for read-only access).
595 static struct module
*find_module_all(const char *name
, size_t len
,
600 module_assert_mutex_or_preempt();
602 list_for_each_entry(mod
, &modules
, list
) {
603 if (!even_unformed
&& mod
->state
== MODULE_STATE_UNFORMED
)
605 if (strlen(mod
->name
) == len
&& !memcmp(mod
->name
, name
, len
))
611 struct module
*find_module(const char *name
)
613 module_assert_mutex();
614 return find_module_all(name
, strlen(name
), false);
616 EXPORT_SYMBOL_GPL(find_module
);
620 static inline void __percpu
*mod_percpu(struct module
*mod
)
625 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
627 Elf_Shdr
*pcpusec
= &info
->sechdrs
[info
->index
.pcpu
];
628 unsigned long align
= pcpusec
->sh_addralign
;
630 if (!pcpusec
->sh_size
)
633 if (align
> PAGE_SIZE
) {
634 pr_warn("%s: per-cpu alignment %li > %li\n",
635 mod
->name
, align
, PAGE_SIZE
);
639 mod
->percpu
= __alloc_reserved_percpu(pcpusec
->sh_size
, align
);
641 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
642 mod
->name
, (unsigned long)pcpusec
->sh_size
);
645 mod
->percpu_size
= pcpusec
->sh_size
;
649 static void percpu_modfree(struct module
*mod
)
651 free_percpu(mod
->percpu
);
654 static unsigned int find_pcpusec(struct load_info
*info
)
656 return find_sec(info
, ".data..percpu");
659 static void percpu_modcopy(struct module
*mod
,
660 const void *from
, unsigned long size
)
664 for_each_possible_cpu(cpu
)
665 memcpy(per_cpu_ptr(mod
->percpu
, cpu
), from
, size
);
669 * is_module_percpu_address - test whether address is from module static percpu
670 * @addr: address to test
672 * Test whether @addr belongs to module static percpu area.
675 * %true if @addr is from module static percpu area
677 bool is_module_percpu_address(unsigned long addr
)
684 list_for_each_entry_rcu(mod
, &modules
, list
) {
685 if (mod
->state
== MODULE_STATE_UNFORMED
)
687 if (!mod
->percpu_size
)
689 for_each_possible_cpu(cpu
) {
690 void *start
= per_cpu_ptr(mod
->percpu
, cpu
);
692 if ((void *)addr
>= start
&&
693 (void *)addr
< start
+ mod
->percpu_size
) {
704 #else /* ... !CONFIG_SMP */
706 static inline void __percpu
*mod_percpu(struct module
*mod
)
710 static int percpu_modalloc(struct module
*mod
, struct load_info
*info
)
712 /* UP modules shouldn't have this section: ENOMEM isn't quite right */
713 if (info
->sechdrs
[info
->index
.pcpu
].sh_size
!= 0)
717 static inline void percpu_modfree(struct module
*mod
)
720 static unsigned int find_pcpusec(struct load_info
*info
)
724 static inline void percpu_modcopy(struct module
*mod
,
725 const void *from
, unsigned long size
)
727 /* pcpusec should be 0, and size of that section should be 0. */
730 bool is_module_percpu_address(unsigned long addr
)
735 #endif /* CONFIG_SMP */
737 #define MODINFO_ATTR(field) \
738 static void setup_modinfo_##field(struct module *mod, const char *s) \
740 mod->field = kstrdup(s, GFP_KERNEL); \
742 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
743 struct module_kobject *mk, char *buffer) \
745 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
747 static int modinfo_##field##_exists(struct module *mod) \
749 return mod->field != NULL; \
751 static void free_modinfo_##field(struct module *mod) \
756 static struct module_attribute modinfo_##field = { \
757 .attr = { .name = __stringify(field), .mode = 0444 }, \
758 .show = show_modinfo_##field, \
759 .setup = setup_modinfo_##field, \
760 .test = modinfo_##field##_exists, \
761 .free = free_modinfo_##field, \
764 MODINFO_ATTR(version
);
765 MODINFO_ATTR(srcversion
);
767 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
769 #ifdef CONFIG_MODULE_UNLOAD
771 EXPORT_TRACEPOINT_SYMBOL(module_get
);
773 /* MODULE_REF_BASE is the base reference count by kmodule loader. */
774 #define MODULE_REF_BASE 1
776 /* Init the unload section of the module. */
777 static int module_unload_init(struct module
*mod
)
780 * Initialize reference counter to MODULE_REF_BASE.
781 * refcnt == 0 means module is going.
783 atomic_set(&mod
->refcnt
, MODULE_REF_BASE
);
785 INIT_LIST_HEAD(&mod
->source_list
);
786 INIT_LIST_HEAD(&mod
->target_list
);
788 /* Hold reference count during initialization. */
789 atomic_inc(&mod
->refcnt
);
794 /* Does a already use b? */
795 static int already_uses(struct module
*a
, struct module
*b
)
797 struct module_use
*use
;
799 list_for_each_entry(use
, &b
->source_list
, source_list
) {
800 if (use
->source
== a
) {
801 pr_debug("%s uses %s!\n", a
->name
, b
->name
);
805 pr_debug("%s does not use %s!\n", a
->name
, b
->name
);
811 * - we add 'a' as a "source", 'b' as a "target" of module use
812 * - the module_use is added to the list of 'b' sources (so
813 * 'b' can walk the list to see who sourced them), and of 'a'
814 * targets (so 'a' can see what modules it targets).
816 static int add_module_usage(struct module
*a
, struct module
*b
)
818 struct module_use
*use
;
820 pr_debug("Allocating new usage for %s.\n", a
->name
);
821 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
823 pr_warn("%s: out of memory loading\n", a
->name
);
829 list_add(&use
->source_list
, &b
->source_list
);
830 list_add(&use
->target_list
, &a
->target_list
);
834 /* Module a uses b: caller needs module_mutex() */
835 int ref_module(struct module
*a
, struct module
*b
)
839 if (b
== NULL
|| already_uses(a
, b
))
842 /* If module isn't available, we fail. */
843 err
= strong_try_module_get(b
);
847 err
= add_module_usage(a
, b
);
854 EXPORT_SYMBOL_GPL(ref_module
);
856 /* Clear the unload stuff of the module. */
857 static void module_unload_free(struct module
*mod
)
859 struct module_use
*use
, *tmp
;
861 mutex_lock(&module_mutex
);
862 list_for_each_entry_safe(use
, tmp
, &mod
->target_list
, target_list
) {
863 struct module
*i
= use
->target
;
864 pr_debug("%s unusing %s\n", mod
->name
, i
->name
);
866 list_del(&use
->source_list
);
867 list_del(&use
->target_list
);
870 mutex_unlock(&module_mutex
);
873 #ifdef CONFIG_MODULE_FORCE_UNLOAD
874 static inline int try_force_unload(unsigned int flags
)
876 int ret
= (flags
& O_TRUNC
);
878 add_taint(TAINT_FORCED_RMMOD
, LOCKDEP_NOW_UNRELIABLE
);
882 static inline int try_force_unload(unsigned int flags
)
886 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
888 /* Try to release refcount of module, 0 means success. */
889 static int try_release_module_ref(struct module
*mod
)
893 /* Try to decrement refcnt which we set at loading */
894 ret
= atomic_sub_return(MODULE_REF_BASE
, &mod
->refcnt
);
897 /* Someone can put this right now, recover with checking */
898 ret
= atomic_add_unless(&mod
->refcnt
, MODULE_REF_BASE
, 0);
903 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
905 /* If it's not unused, quit unless we're forcing. */
906 if (try_release_module_ref(mod
) != 0) {
907 *forced
= try_force_unload(flags
);
912 /* Mark it as dying. */
913 mod
->state
= MODULE_STATE_GOING
;
919 * module_refcount - return the refcount or -1 if unloading
921 * @mod: the module we're checking
924 * -1 if the module is in the process of unloading
925 * otherwise the number of references in the kernel to the module
927 int module_refcount(struct module
*mod
)
929 return atomic_read(&mod
->refcnt
) - MODULE_REF_BASE
;
931 EXPORT_SYMBOL(module_refcount
);
933 /* This exists whether we can unload or not */
934 static void free_module(struct module
*mod
);
936 SYSCALL_DEFINE2(delete_module
, const char __user
*, name_user
,
940 char name
[MODULE_NAME_LEN
];
943 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
946 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
948 name
[MODULE_NAME_LEN
-1] = '\0';
950 if (mutex_lock_interruptible(&module_mutex
) != 0)
953 mod
= find_module(name
);
959 if (!list_empty(&mod
->source_list
)) {
960 /* Other modules depend on us: get rid of them first. */
965 /* Doing init or already dying? */
966 if (mod
->state
!= MODULE_STATE_LIVE
) {
967 /* FIXME: if (force), slam module count damn the torpedoes */
968 pr_debug("%s already dying\n", mod
->name
);
973 /* If it has an init func, it must have an exit func to unload */
974 if (mod
->init
&& !mod
->exit
) {
975 forced
= try_force_unload(flags
);
977 /* This module can't be removed */
983 /* Stop the machine so refcounts can't move and disable module. */
984 ret
= try_stop_module(mod
, flags
, &forced
);
988 mutex_unlock(&module_mutex
);
989 /* Final destruction now no one is using it. */
990 if (mod
->exit
!= NULL
)
992 blocking_notifier_call_chain(&module_notify_list
,
993 MODULE_STATE_GOING
, mod
);
994 klp_module_going(mod
);
995 ftrace_release_mod(mod
);
997 async_synchronize_full();
999 /* Store the name of the last unloaded module for diagnostic purposes */
1000 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
1005 mutex_unlock(&module_mutex
);
1009 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1011 struct module_use
*use
;
1012 int printed_something
= 0;
1014 seq_printf(m
, " %i ", module_refcount(mod
));
1017 * Always include a trailing , so userspace can differentiate
1018 * between this and the old multi-field proc format.
1020 list_for_each_entry(use
, &mod
->source_list
, source_list
) {
1021 printed_something
= 1;
1022 seq_printf(m
, "%s,", use
->source
->name
);
1025 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
1026 printed_something
= 1;
1027 seq_puts(m
, "[permanent],");
1030 if (!printed_something
)
1034 void __symbol_put(const char *symbol
)
1036 struct module
*owner
;
1039 if (!find_symbol(symbol
, &owner
, NULL
, true, false))
1044 EXPORT_SYMBOL(__symbol_put
);
1046 /* Note this assumes addr is a function, which it currently always is. */
1047 void symbol_put_addr(void *addr
)
1049 struct module
*modaddr
;
1050 unsigned long a
= (unsigned long)dereference_function_descriptor(addr
);
1052 if (core_kernel_text(a
))
1056 * Even though we hold a reference on the module; we still need to
1057 * disable preemption in order to safely traverse the data structure.
1060 modaddr
= __module_text_address(a
);
1062 module_put(modaddr
);
1065 EXPORT_SYMBOL_GPL(symbol_put_addr
);
1067 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
1068 struct module_kobject
*mk
, char *buffer
)
1070 return sprintf(buffer
, "%i\n", module_refcount(mk
->mod
));
1073 static struct module_attribute modinfo_refcnt
=
1074 __ATTR(refcnt
, 0444, show_refcnt
, NULL
);
1076 void __module_get(struct module
*module
)
1080 atomic_inc(&module
->refcnt
);
1081 trace_module_get(module
, _RET_IP_
);
1085 EXPORT_SYMBOL(__module_get
);
1087 bool try_module_get(struct module
*module
)
1093 /* Note: here, we can fail to get a reference */
1094 if (likely(module_is_live(module
) &&
1095 atomic_inc_not_zero(&module
->refcnt
) != 0))
1096 trace_module_get(module
, _RET_IP_
);
1104 EXPORT_SYMBOL(try_module_get
);
1106 void module_put(struct module
*module
)
1112 ret
= atomic_dec_if_positive(&module
->refcnt
);
1113 WARN_ON(ret
< 0); /* Failed to put refcount */
1114 trace_module_put(module
, _RET_IP_
);
1118 EXPORT_SYMBOL(module_put
);
1120 #else /* !CONFIG_MODULE_UNLOAD */
1121 static inline void print_unload_info(struct seq_file
*m
, struct module
*mod
)
1123 /* We don't know the usage count, or what modules are using. */
1124 seq_puts(m
, " - -");
1127 static inline void module_unload_free(struct module
*mod
)
1131 int ref_module(struct module
*a
, struct module
*b
)
1133 return strong_try_module_get(b
);
1135 EXPORT_SYMBOL_GPL(ref_module
);
1137 static inline int module_unload_init(struct module
*mod
)
1141 #endif /* CONFIG_MODULE_UNLOAD */
1143 static size_t module_flags_taint(struct module
*mod
, char *buf
)
1148 for (i
= 0; i
< TAINT_FLAGS_COUNT
; i
++) {
1149 if (taint_flags
[i
].module
&& test_bit(i
, &mod
->taints
))
1150 buf
[l
++] = taint_flags
[i
].c_true
;
1156 static ssize_t
show_initstate(struct module_attribute
*mattr
,
1157 struct module_kobject
*mk
, char *buffer
)
1159 const char *state
= "unknown";
1161 switch (mk
->mod
->state
) {
1162 case MODULE_STATE_LIVE
:
1165 case MODULE_STATE_COMING
:
1168 case MODULE_STATE_GOING
:
1174 return sprintf(buffer
, "%s\n", state
);
1177 static struct module_attribute modinfo_initstate
=
1178 __ATTR(initstate
, 0444, show_initstate
, NULL
);
1180 static ssize_t
store_uevent(struct module_attribute
*mattr
,
1181 struct module_kobject
*mk
,
1182 const char *buffer
, size_t count
)
1184 enum kobject_action action
;
1186 if (kobject_action_type(buffer
, count
, &action
) == 0)
1187 kobject_uevent(&mk
->kobj
, action
);
1191 struct module_attribute module_uevent
=
1192 __ATTR(uevent
, 0200, NULL
, store_uevent
);
1194 static ssize_t
show_coresize(struct module_attribute
*mattr
,
1195 struct module_kobject
*mk
, char *buffer
)
1197 return sprintf(buffer
, "%u\n", mk
->mod
->core_layout
.size
);
1200 static struct module_attribute modinfo_coresize
=
1201 __ATTR(coresize
, 0444, show_coresize
, NULL
);
1203 static ssize_t
show_initsize(struct module_attribute
*mattr
,
1204 struct module_kobject
*mk
, char *buffer
)
1206 return sprintf(buffer
, "%u\n", mk
->mod
->init_layout
.size
);
1209 static struct module_attribute modinfo_initsize
=
1210 __ATTR(initsize
, 0444, show_initsize
, NULL
);
1212 static ssize_t
show_taint(struct module_attribute
*mattr
,
1213 struct module_kobject
*mk
, char *buffer
)
1217 l
= module_flags_taint(mk
->mod
, buffer
);
1222 static struct module_attribute modinfo_taint
=
1223 __ATTR(taint
, 0444, show_taint
, NULL
);
1225 static struct module_attribute
*modinfo_attrs
[] = {
1228 &modinfo_srcversion
,
1233 #ifdef CONFIG_MODULE_UNLOAD
1239 static const char vermagic
[] = VERMAGIC_STRING
;
1241 static int try_to_force_load(struct module
*mod
, const char *reason
)
1243 #ifdef CONFIG_MODULE_FORCE_LOAD
1244 if (!test_taint(TAINT_FORCED_MODULE
))
1245 pr_warn("%s: %s: kernel tainted.\n", mod
->name
, reason
);
1246 add_taint_module(mod
, TAINT_FORCED_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
1253 #ifdef CONFIG_MODVERSIONS
1255 static u32
resolve_rel_crc(const s32
*crc
)
1257 return *(u32
*)((void *)crc
+ *crc
);
1260 static int check_version(Elf_Shdr
*sechdrs
,
1261 unsigned int versindex
,
1262 const char *symname
,
1266 unsigned int i
, num_versions
;
1267 struct modversion_info
*versions
;
1269 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1273 /* No versions at all? modprobe --force does this. */
1275 return try_to_force_load(mod
, symname
) == 0;
1277 versions
= (void *) sechdrs
[versindex
].sh_addr
;
1278 num_versions
= sechdrs
[versindex
].sh_size
1279 / sizeof(struct modversion_info
);
1281 for (i
= 0; i
< num_versions
; i
++) {
1284 if (strcmp(versions
[i
].name
, symname
) != 0)
1287 if (IS_ENABLED(CONFIG_MODULE_REL_CRCS
))
1288 crcval
= resolve_rel_crc(crc
);
1291 if (versions
[i
].crc
== crcval
)
1293 pr_debug("Found checksum %X vs module %lX\n",
1294 crcval
, versions
[i
].crc
);
1298 /* Broken toolchain. Warn once, then let it go.. */
1299 pr_warn_once("%s: no symbol version for %s\n", mod
->name
, symname
);
1303 pr_warn("%s: disagrees about version of symbol %s\n",
1304 mod
->name
, symname
);
1308 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1309 unsigned int versindex
,
1315 * Since this should be found in kernel (which can't be removed), no
1316 * locking is necessary -- use preempt_disable() to placate lockdep.
1319 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout
), NULL
,
1320 &crc
, true, false)) {
1325 return check_version(sechdrs
, versindex
,
1326 VMLINUX_SYMBOL_STR(module_layout
), mod
, crc
);
1329 /* First part is kernel version, which we ignore if module has crcs. */
1330 static inline int same_magic(const char *amagic
, const char *bmagic
,
1334 amagic
+= strcspn(amagic
, " ");
1335 bmagic
+= strcspn(bmagic
, " ");
1337 return strcmp(amagic
, bmagic
) == 0;
1340 static inline int check_version(Elf_Shdr
*sechdrs
,
1341 unsigned int versindex
,
1342 const char *symname
,
1349 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
1350 unsigned int versindex
,
1356 static inline int same_magic(const char *amagic
, const char *bmagic
,
1359 return strcmp(amagic
, bmagic
) == 0;
1361 #endif /* CONFIG_MODVERSIONS */
1363 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1364 static const struct kernel_symbol
*resolve_symbol(struct module
*mod
,
1365 const struct load_info
*info
,
1369 struct module
*owner
;
1370 const struct kernel_symbol
*sym
;
1375 * The module_mutex should not be a heavily contended lock;
1376 * if we get the occasional sleep here, we'll go an extra iteration
1377 * in the wait_event_interruptible(), which is harmless.
1379 sched_annotate_sleep();
1380 mutex_lock(&module_mutex
);
1381 sym
= find_symbol(name
, &owner
, &crc
,
1382 !(mod
->taints
& (1 << TAINT_PROPRIETARY_MODULE
)), true);
1386 if (!check_version(info
->sechdrs
, info
->index
.vers
, name
, mod
, crc
)) {
1387 sym
= ERR_PTR(-EINVAL
);
1391 err
= ref_module(mod
, owner
);
1398 /* We must make copy under the lock if we failed to get ref. */
1399 strncpy(ownername
, module_name(owner
), MODULE_NAME_LEN
);
1401 mutex_unlock(&module_mutex
);
1405 static const struct kernel_symbol
*
1406 resolve_symbol_wait(struct module
*mod
,
1407 const struct load_info
*info
,
1410 const struct kernel_symbol
*ksym
;
1411 char owner
[MODULE_NAME_LEN
];
1413 if (wait_event_interruptible_timeout(module_wq
,
1414 !IS_ERR(ksym
= resolve_symbol(mod
, info
, name
, owner
))
1415 || PTR_ERR(ksym
) != -EBUSY
,
1417 pr_warn("%s: gave up waiting for init of module %s.\n",
1424 * /sys/module/foo/sections stuff
1425 * J. Corbet <corbet@lwn.net>
1429 #ifdef CONFIG_KALLSYMS
1430 static inline bool sect_empty(const Elf_Shdr
*sect
)
1432 return !(sect
->sh_flags
& SHF_ALLOC
) || sect
->sh_size
== 0;
1435 struct module_sect_attr
{
1436 struct module_attribute mattr
;
1438 unsigned long address
;
1441 struct module_sect_attrs
{
1442 struct attribute_group grp
;
1443 unsigned int nsections
;
1444 struct module_sect_attr attrs
[0];
1447 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1448 struct module_kobject
*mk
, char *buf
)
1450 struct module_sect_attr
*sattr
=
1451 container_of(mattr
, struct module_sect_attr
, mattr
);
1452 return sprintf(buf
, "0x%pK\n", (void *)sattr
->address
);
1455 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1457 unsigned int section
;
1459 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1460 kfree(sect_attrs
->attrs
[section
].name
);
1464 static void add_sect_attrs(struct module
*mod
, const struct load_info
*info
)
1466 unsigned int nloaded
= 0, i
, size
[2];
1467 struct module_sect_attrs
*sect_attrs
;
1468 struct module_sect_attr
*sattr
;
1469 struct attribute
**gattr
;
1471 /* Count loaded sections and allocate structures */
1472 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1473 if (!sect_empty(&info
->sechdrs
[i
]))
1475 size
[0] = ALIGN(sizeof(*sect_attrs
)
1476 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1477 sizeof(sect_attrs
->grp
.attrs
[0]));
1478 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1479 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1480 if (sect_attrs
== NULL
)
1483 /* Setup section attributes. */
1484 sect_attrs
->grp
.name
= "sections";
1485 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1487 sect_attrs
->nsections
= 0;
1488 sattr
= §_attrs
->attrs
[0];
1489 gattr
= §_attrs
->grp
.attrs
[0];
1490 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
1491 Elf_Shdr
*sec
= &info
->sechdrs
[i
];
1492 if (sect_empty(sec
))
1494 sattr
->address
= sec
->sh_addr
;
1495 sattr
->name
= kstrdup(info
->secstrings
+ sec
->sh_name
,
1497 if (sattr
->name
== NULL
)
1499 sect_attrs
->nsections
++;
1500 sysfs_attr_init(&sattr
->mattr
.attr
);
1501 sattr
->mattr
.show
= module_sect_show
;
1502 sattr
->mattr
.store
= NULL
;
1503 sattr
->mattr
.attr
.name
= sattr
->name
;
1504 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1505 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1509 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1512 mod
->sect_attrs
= sect_attrs
;
1515 free_sect_attrs(sect_attrs
);
1518 static void remove_sect_attrs(struct module
*mod
)
1520 if (mod
->sect_attrs
) {
1521 sysfs_remove_group(&mod
->mkobj
.kobj
,
1522 &mod
->sect_attrs
->grp
);
1523 /* We are positive that no one is using any sect attrs
1524 * at this point. Deallocate immediately. */
1525 free_sect_attrs(mod
->sect_attrs
);
1526 mod
->sect_attrs
= NULL
;
1531 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1534 struct module_notes_attrs
{
1535 struct kobject
*dir
;
1537 struct bin_attribute attrs
[0];
1540 static ssize_t
module_notes_read(struct file
*filp
, struct kobject
*kobj
,
1541 struct bin_attribute
*bin_attr
,
1542 char *buf
, loff_t pos
, size_t count
)
1545 * The caller checked the pos and count against our size.
1547 memcpy(buf
, bin_attr
->private + pos
, count
);
1551 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1554 if (notes_attrs
->dir
) {
1556 sysfs_remove_bin_file(notes_attrs
->dir
,
1557 ¬es_attrs
->attrs
[i
]);
1558 kobject_put(notes_attrs
->dir
);
1563 static void add_notes_attrs(struct module
*mod
, const struct load_info
*info
)
1565 unsigned int notes
, loaded
, i
;
1566 struct module_notes_attrs
*notes_attrs
;
1567 struct bin_attribute
*nattr
;
1569 /* failed to create section attributes, so can't create notes */
1570 if (!mod
->sect_attrs
)
1573 /* Count notes sections and allocate structures. */
1575 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
1576 if (!sect_empty(&info
->sechdrs
[i
]) &&
1577 (info
->sechdrs
[i
].sh_type
== SHT_NOTE
))
1583 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1584 + notes
* sizeof(notes_attrs
->attrs
[0]),
1586 if (notes_attrs
== NULL
)
1589 notes_attrs
->notes
= notes
;
1590 nattr
= ¬es_attrs
->attrs
[0];
1591 for (loaded
= i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
1592 if (sect_empty(&info
->sechdrs
[i
]))
1594 if (info
->sechdrs
[i
].sh_type
== SHT_NOTE
) {
1595 sysfs_bin_attr_init(nattr
);
1596 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1597 nattr
->attr
.mode
= S_IRUGO
;
1598 nattr
->size
= info
->sechdrs
[i
].sh_size
;
1599 nattr
->private = (void *) info
->sechdrs
[i
].sh_addr
;
1600 nattr
->read
= module_notes_read
;
1606 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1607 if (!notes_attrs
->dir
)
1610 for (i
= 0; i
< notes
; ++i
)
1611 if (sysfs_create_bin_file(notes_attrs
->dir
,
1612 ¬es_attrs
->attrs
[i
]))
1615 mod
->notes_attrs
= notes_attrs
;
1619 free_notes_attrs(notes_attrs
, i
);
1622 static void remove_notes_attrs(struct module
*mod
)
1624 if (mod
->notes_attrs
)
1625 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1630 static inline void add_sect_attrs(struct module
*mod
,
1631 const struct load_info
*info
)
1635 static inline void remove_sect_attrs(struct module
*mod
)
1639 static inline void add_notes_attrs(struct module
*mod
,
1640 const struct load_info
*info
)
1644 static inline void remove_notes_attrs(struct module
*mod
)
1647 #endif /* CONFIG_KALLSYMS */
1649 static void add_usage_links(struct module
*mod
)
1651 #ifdef CONFIG_MODULE_UNLOAD
1652 struct module_use
*use
;
1655 mutex_lock(&module_mutex
);
1656 list_for_each_entry(use
, &mod
->target_list
, target_list
) {
1657 nowarn
= sysfs_create_link(use
->target
->holders_dir
,
1658 &mod
->mkobj
.kobj
, mod
->name
);
1660 mutex_unlock(&module_mutex
);
1664 static void del_usage_links(struct module
*mod
)
1666 #ifdef CONFIG_MODULE_UNLOAD
1667 struct module_use
*use
;
1669 mutex_lock(&module_mutex
);
1670 list_for_each_entry(use
, &mod
->target_list
, target_list
)
1671 sysfs_remove_link(use
->target
->holders_dir
, mod
->name
);
1672 mutex_unlock(&module_mutex
);
1676 static int module_add_modinfo_attrs(struct module
*mod
)
1678 struct module_attribute
*attr
;
1679 struct module_attribute
*temp_attr
;
1683 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1684 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1686 if (!mod
->modinfo_attrs
)
1689 temp_attr
= mod
->modinfo_attrs
;
1690 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1691 if (!attr
->test
|| attr
->test(mod
)) {
1692 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1693 sysfs_attr_init(&temp_attr
->attr
);
1694 error
= sysfs_create_file(&mod
->mkobj
.kobj
,
1702 static void module_remove_modinfo_attrs(struct module
*mod
)
1704 struct module_attribute
*attr
;
1707 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1708 /* pick a field to test for end of list */
1709 if (!attr
->attr
.name
)
1711 sysfs_remove_file(&mod
->mkobj
.kobj
, &attr
->attr
);
1715 kfree(mod
->modinfo_attrs
);
1718 static void mod_kobject_put(struct module
*mod
)
1720 DECLARE_COMPLETION_ONSTACK(c
);
1721 mod
->mkobj
.kobj_completion
= &c
;
1722 kobject_put(&mod
->mkobj
.kobj
);
1723 wait_for_completion(&c
);
1726 static int mod_sysfs_init(struct module
*mod
)
1729 struct kobject
*kobj
;
1731 if (!module_sysfs_initialized
) {
1732 pr_err("%s: module sysfs not initialized\n", mod
->name
);
1737 kobj
= kset_find_obj(module_kset
, mod
->name
);
1739 pr_err("%s: module is already loaded\n", mod
->name
);
1745 mod
->mkobj
.mod
= mod
;
1747 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1748 mod
->mkobj
.kobj
.kset
= module_kset
;
1749 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1752 mod_kobject_put(mod
);
1754 /* delay uevent until full sysfs population */
1759 static int mod_sysfs_setup(struct module
*mod
,
1760 const struct load_info
*info
,
1761 struct kernel_param
*kparam
,
1762 unsigned int num_params
)
1766 err
= mod_sysfs_init(mod
);
1770 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1771 if (!mod
->holders_dir
) {
1776 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1778 goto out_unreg_holders
;
1780 err
= module_add_modinfo_attrs(mod
);
1782 goto out_unreg_param
;
1784 add_usage_links(mod
);
1785 add_sect_attrs(mod
, info
);
1786 add_notes_attrs(mod
, info
);
1788 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1792 module_param_sysfs_remove(mod
);
1794 kobject_put(mod
->holders_dir
);
1796 mod_kobject_put(mod
);
1801 static void mod_sysfs_fini(struct module
*mod
)
1803 remove_notes_attrs(mod
);
1804 remove_sect_attrs(mod
);
1805 mod_kobject_put(mod
);
1808 static void init_param_lock(struct module
*mod
)
1810 mutex_init(&mod
->param_lock
);
1812 #else /* !CONFIG_SYSFS */
1814 static int mod_sysfs_setup(struct module
*mod
,
1815 const struct load_info
*info
,
1816 struct kernel_param
*kparam
,
1817 unsigned int num_params
)
1822 static void mod_sysfs_fini(struct module
*mod
)
1826 static void module_remove_modinfo_attrs(struct module
*mod
)
1830 static void del_usage_links(struct module
*mod
)
1834 static void init_param_lock(struct module
*mod
)
1837 #endif /* CONFIG_SYSFS */
1839 static void mod_sysfs_teardown(struct module
*mod
)
1841 del_usage_links(mod
);
1842 module_remove_modinfo_attrs(mod
);
1843 module_param_sysfs_remove(mod
);
1844 kobject_put(mod
->mkobj
.drivers_dir
);
1845 kobject_put(mod
->holders_dir
);
1846 mod_sysfs_fini(mod
);
1849 #ifdef CONFIG_STRICT_MODULE_RWX
1851 * LKM RO/NX protection: protect module's text/ro-data
1852 * from modification and any data from execution.
1854 * General layout of module is:
1855 * [text] [read-only-data] [ro-after-init] [writable data]
1856 * text_size -----^ ^ ^ ^
1857 * ro_size ------------------------| | |
1858 * ro_after_init_size -----------------------------| |
1859 * size -----------------------------------------------------------|
1861 * These values are always page-aligned (as is base)
1863 static void frob_text(const struct module_layout
*layout
,
1864 int (*set_memory
)(unsigned long start
, int num_pages
))
1866 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1867 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1868 set_memory((unsigned long)layout
->base
,
1869 layout
->text_size
>> PAGE_SHIFT
);
1872 static void frob_rodata(const struct module_layout
*layout
,
1873 int (*set_memory
)(unsigned long start
, int num_pages
))
1875 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1876 BUG_ON((unsigned long)layout
->text_size
& (PAGE_SIZE
-1));
1877 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1878 set_memory((unsigned long)layout
->base
+ layout
->text_size
,
1879 (layout
->ro_size
- layout
->text_size
) >> PAGE_SHIFT
);
1882 static void frob_ro_after_init(const struct module_layout
*layout
,
1883 int (*set_memory
)(unsigned long start
, int num_pages
))
1885 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1886 BUG_ON((unsigned long)layout
->ro_size
& (PAGE_SIZE
-1));
1887 BUG_ON((unsigned long)layout
->ro_after_init_size
& (PAGE_SIZE
-1));
1888 set_memory((unsigned long)layout
->base
+ layout
->ro_size
,
1889 (layout
->ro_after_init_size
- layout
->ro_size
) >> PAGE_SHIFT
);
1892 static void frob_writable_data(const struct module_layout
*layout
,
1893 int (*set_memory
)(unsigned long start
, int num_pages
))
1895 BUG_ON((unsigned long)layout
->base
& (PAGE_SIZE
-1));
1896 BUG_ON((unsigned long)layout
->ro_after_init_size
& (PAGE_SIZE
-1));
1897 BUG_ON((unsigned long)layout
->size
& (PAGE_SIZE
-1));
1898 set_memory((unsigned long)layout
->base
+ layout
->ro_after_init_size
,
1899 (layout
->size
- layout
->ro_after_init_size
) >> PAGE_SHIFT
);
1902 /* livepatching wants to disable read-only so it can frob module. */
1903 void module_disable_ro(const struct module
*mod
)
1905 if (!rodata_enabled
)
1908 frob_text(&mod
->core_layout
, set_memory_rw
);
1909 frob_rodata(&mod
->core_layout
, set_memory_rw
);
1910 frob_ro_after_init(&mod
->core_layout
, set_memory_rw
);
1911 frob_text(&mod
->init_layout
, set_memory_rw
);
1912 frob_rodata(&mod
->init_layout
, set_memory_rw
);
1915 void module_enable_ro(const struct module
*mod
, bool after_init
)
1917 if (!rodata_enabled
)
1920 frob_text(&mod
->core_layout
, set_memory_ro
);
1921 frob_rodata(&mod
->core_layout
, set_memory_ro
);
1922 frob_text(&mod
->init_layout
, set_memory_ro
);
1923 frob_rodata(&mod
->init_layout
, set_memory_ro
);
1926 frob_ro_after_init(&mod
->core_layout
, set_memory_ro
);
1929 static void module_enable_nx(const struct module
*mod
)
1931 frob_rodata(&mod
->core_layout
, set_memory_nx
);
1932 frob_ro_after_init(&mod
->core_layout
, set_memory_nx
);
1933 frob_writable_data(&mod
->core_layout
, set_memory_nx
);
1934 frob_rodata(&mod
->init_layout
, set_memory_nx
);
1935 frob_writable_data(&mod
->init_layout
, set_memory_nx
);
1938 static void module_disable_nx(const struct module
*mod
)
1940 frob_rodata(&mod
->core_layout
, set_memory_x
);
1941 frob_ro_after_init(&mod
->core_layout
, set_memory_x
);
1942 frob_writable_data(&mod
->core_layout
, set_memory_x
);
1943 frob_rodata(&mod
->init_layout
, set_memory_x
);
1944 frob_writable_data(&mod
->init_layout
, set_memory_x
);
1947 /* Iterate through all modules and set each module's text as RW */
1948 void set_all_modules_text_rw(void)
1952 if (!rodata_enabled
)
1955 mutex_lock(&module_mutex
);
1956 list_for_each_entry_rcu(mod
, &modules
, list
) {
1957 if (mod
->state
== MODULE_STATE_UNFORMED
)
1960 frob_text(&mod
->core_layout
, set_memory_rw
);
1961 frob_text(&mod
->init_layout
, set_memory_rw
);
1963 mutex_unlock(&module_mutex
);
1966 /* Iterate through all modules and set each module's text as RO */
1967 void set_all_modules_text_ro(void)
1971 if (!rodata_enabled
)
1974 mutex_lock(&module_mutex
);
1975 list_for_each_entry_rcu(mod
, &modules
, list
) {
1977 * Ignore going modules since it's possible that ro
1978 * protection has already been disabled, otherwise we'll
1979 * run into protection faults at module deallocation.
1981 if (mod
->state
== MODULE_STATE_UNFORMED
||
1982 mod
->state
== MODULE_STATE_GOING
)
1985 frob_text(&mod
->core_layout
, set_memory_ro
);
1986 frob_text(&mod
->init_layout
, set_memory_ro
);
1988 mutex_unlock(&module_mutex
);
1991 static void disable_ro_nx(const struct module_layout
*layout
)
1993 if (rodata_enabled
) {
1994 frob_text(layout
, set_memory_rw
);
1995 frob_rodata(layout
, set_memory_rw
);
1996 frob_ro_after_init(layout
, set_memory_rw
);
1998 frob_rodata(layout
, set_memory_x
);
1999 frob_ro_after_init(layout
, set_memory_x
);
2000 frob_writable_data(layout
, set_memory_x
);
2004 static void disable_ro_nx(const struct module_layout
*layout
) { }
2005 static void module_enable_nx(const struct module
*mod
) { }
2006 static void module_disable_nx(const struct module
*mod
) { }
2009 #ifdef CONFIG_LIVEPATCH
2011 * Persist Elf information about a module. Copy the Elf header,
2012 * section header table, section string table, and symtab section
2013 * index from info to mod->klp_info.
2015 static int copy_module_elf(struct module
*mod
, struct load_info
*info
)
2017 unsigned int size
, symndx
;
2020 size
= sizeof(*mod
->klp_info
);
2021 mod
->klp_info
= kmalloc(size
, GFP_KERNEL
);
2022 if (mod
->klp_info
== NULL
)
2026 size
= sizeof(mod
->klp_info
->hdr
);
2027 memcpy(&mod
->klp_info
->hdr
, info
->hdr
, size
);
2029 /* Elf section header table */
2030 size
= sizeof(*info
->sechdrs
) * info
->hdr
->e_shnum
;
2031 mod
->klp_info
->sechdrs
= kmalloc(size
, GFP_KERNEL
);
2032 if (mod
->klp_info
->sechdrs
== NULL
) {
2036 memcpy(mod
->klp_info
->sechdrs
, info
->sechdrs
, size
);
2038 /* Elf section name string table */
2039 size
= info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_size
;
2040 mod
->klp_info
->secstrings
= kmalloc(size
, GFP_KERNEL
);
2041 if (mod
->klp_info
->secstrings
== NULL
) {
2045 memcpy(mod
->klp_info
->secstrings
, info
->secstrings
, size
);
2047 /* Elf symbol section index */
2048 symndx
= info
->index
.sym
;
2049 mod
->klp_info
->symndx
= symndx
;
2052 * For livepatch modules, core_kallsyms.symtab is a complete
2053 * copy of the original symbol table. Adjust sh_addr to point
2054 * to core_kallsyms.symtab since the copy of the symtab in module
2055 * init memory is freed at the end of do_init_module().
2057 mod
->klp_info
->sechdrs
[symndx
].sh_addr
= \
2058 (unsigned long) mod
->core_kallsyms
.symtab
;
2063 kfree(mod
->klp_info
->sechdrs
);
2065 kfree(mod
->klp_info
);
2069 static void free_module_elf(struct module
*mod
)
2071 kfree(mod
->klp_info
->sechdrs
);
2072 kfree(mod
->klp_info
->secstrings
);
2073 kfree(mod
->klp_info
);
2075 #else /* !CONFIG_LIVEPATCH */
2076 static int copy_module_elf(struct module
*mod
, struct load_info
*info
)
2081 static void free_module_elf(struct module
*mod
)
2084 #endif /* CONFIG_LIVEPATCH */
2086 void __weak
module_memfree(void *module_region
)
2088 vfree(module_region
);
2091 void __weak
module_arch_cleanup(struct module
*mod
)
2095 void __weak
module_arch_freeing_init(struct module
*mod
)
2099 /* Free a module, remove from lists, etc. */
2100 static void free_module(struct module
*mod
)
2102 trace_module_free(mod
);
2104 mod_sysfs_teardown(mod
);
2106 /* We leave it in list to prevent duplicate loads, but make sure
2107 * that noone uses it while it's being deconstructed. */
2108 mutex_lock(&module_mutex
);
2109 mod
->state
= MODULE_STATE_UNFORMED
;
2110 mutex_unlock(&module_mutex
);
2112 /* Remove dynamic debug info */
2113 ddebug_remove_module(mod
->name
);
2115 /* Arch-specific cleanup. */
2116 module_arch_cleanup(mod
);
2118 /* Module unload stuff */
2119 module_unload_free(mod
);
2121 /* Free any allocated parameters. */
2122 destroy_params(mod
->kp
, mod
->num_kp
);
2124 if (is_livepatch_module(mod
))
2125 free_module_elf(mod
);
2127 /* Now we can delete it from the lists */
2128 mutex_lock(&module_mutex
);
2129 /* Unlink carefully: kallsyms could be walking list. */
2130 list_del_rcu(&mod
->list
);
2131 mod_tree_remove(mod
);
2132 /* Remove this module from bug list, this uses list_del_rcu */
2133 module_bug_cleanup(mod
);
2134 /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */
2135 synchronize_sched();
2136 mutex_unlock(&module_mutex
);
2138 /* This may be empty, but that's OK */
2139 disable_ro_nx(&mod
->init_layout
);
2140 module_arch_freeing_init(mod
);
2141 module_memfree(mod
->init_layout
.base
);
2143 percpu_modfree(mod
);
2145 /* Free lock-classes; relies on the preceding sync_rcu(). */
2146 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
2148 /* Finally, free the core (containing the module structure) */
2149 disable_ro_nx(&mod
->core_layout
);
2150 module_memfree(mod
->core_layout
.base
);
2153 update_protections(current
->mm
);
2157 void *__symbol_get(const char *symbol
)
2159 struct module
*owner
;
2160 const struct kernel_symbol
*sym
;
2163 sym
= find_symbol(symbol
, &owner
, NULL
, true, true);
2164 if (sym
&& strong_try_module_get(owner
))
2168 return sym
? (void *)sym
->value
: NULL
;
2170 EXPORT_SYMBOL_GPL(__symbol_get
);
2173 * Ensure that an exported symbol [global namespace] does not already exist
2174 * in the kernel or in some other module's exported symbol table.
2176 * You must hold the module_mutex.
2178 static int verify_export_symbols(struct module
*mod
)
2181 struct module
*owner
;
2182 const struct kernel_symbol
*s
;
2184 const struct kernel_symbol
*sym
;
2187 { mod
->syms
, mod
->num_syms
},
2188 { mod
->gpl_syms
, mod
->num_gpl_syms
},
2189 { mod
->gpl_future_syms
, mod
->num_gpl_future_syms
},
2190 #ifdef CONFIG_UNUSED_SYMBOLS
2191 { mod
->unused_syms
, mod
->num_unused_syms
},
2192 { mod
->unused_gpl_syms
, mod
->num_unused_gpl_syms
},
2196 for (i
= 0; i
< ARRAY_SIZE(arr
); i
++) {
2197 for (s
= arr
[i
].sym
; s
< arr
[i
].sym
+ arr
[i
].num
; s
++) {
2198 if (find_symbol(s
->name
, &owner
, NULL
, true, false)) {
2199 pr_err("%s: exports duplicate symbol %s"
2201 mod
->name
, s
->name
, module_name(owner
));
2209 /* Change all symbols so that st_value encodes the pointer directly. */
2210 static int simplify_symbols(struct module
*mod
, const struct load_info
*info
)
2212 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2213 Elf_Sym
*sym
= (void *)symsec
->sh_addr
;
2214 unsigned long secbase
;
2217 const struct kernel_symbol
*ksym
;
2219 for (i
= 1; i
< symsec
->sh_size
/ sizeof(Elf_Sym
); i
++) {
2220 const char *name
= info
->strtab
+ sym
[i
].st_name
;
2222 switch (sym
[i
].st_shndx
) {
2224 /* Ignore common symbols */
2225 if (!strncmp(name
, "__gnu_lto", 9))
2228 /* We compiled with -fno-common. These are not
2229 supposed to happen. */
2230 pr_debug("Common symbol: %s\n", name
);
2231 pr_warn("%s: please compile with -fno-common\n",
2237 /* Don't need to do anything */
2238 pr_debug("Absolute symbol: 0x%08lx\n",
2239 (long)sym
[i
].st_value
);
2243 /* Livepatch symbols are resolved by livepatch */
2247 ksym
= resolve_symbol_wait(mod
, info
, name
);
2248 /* Ok if resolved. */
2249 if (ksym
&& !IS_ERR(ksym
)) {
2250 sym
[i
].st_value
= ksym
->value
;
2255 if (!ksym
&& ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
2258 pr_warn("%s: Unknown symbol %s (err %li)\n",
2259 mod
->name
, name
, PTR_ERR(ksym
));
2260 ret
= PTR_ERR(ksym
) ?: -ENOENT
;
2264 /* Divert to percpu allocation if a percpu var. */
2265 if (sym
[i
].st_shndx
== info
->index
.pcpu
)
2266 secbase
= (unsigned long)mod_percpu(mod
);
2268 secbase
= info
->sechdrs
[sym
[i
].st_shndx
].sh_addr
;
2269 sym
[i
].st_value
+= secbase
;
2277 static int apply_relocations(struct module
*mod
, const struct load_info
*info
)
2282 /* Now do relocations. */
2283 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2284 unsigned int infosec
= info
->sechdrs
[i
].sh_info
;
2286 /* Not a valid relocation section? */
2287 if (infosec
>= info
->hdr
->e_shnum
)
2290 /* Don't bother with non-allocated sections */
2291 if (!(info
->sechdrs
[infosec
].sh_flags
& SHF_ALLOC
))
2294 /* Livepatch relocation sections are applied by livepatch */
2295 if (info
->sechdrs
[i
].sh_flags
& SHF_RELA_LIVEPATCH
)
2298 if (info
->sechdrs
[i
].sh_type
== SHT_REL
)
2299 err
= apply_relocate(info
->sechdrs
, info
->strtab
,
2300 info
->index
.sym
, i
, mod
);
2301 else if (info
->sechdrs
[i
].sh_type
== SHT_RELA
)
2302 err
= apply_relocate_add(info
->sechdrs
, info
->strtab
,
2303 info
->index
.sym
, i
, mod
);
2310 /* Additional bytes needed by arch in front of individual sections */
2311 unsigned int __weak
arch_mod_section_prepend(struct module
*mod
,
2312 unsigned int section
)
2314 /* default implementation just returns zero */
2318 /* Update size with this section: return offset. */
2319 static long get_offset(struct module
*mod
, unsigned int *size
,
2320 Elf_Shdr
*sechdr
, unsigned int section
)
2324 *size
+= arch_mod_section_prepend(mod
, section
);
2325 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
2326 *size
= ret
+ sechdr
->sh_size
;
2330 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2331 might -- code, read-only data, read-write data, small data. Tally
2332 sizes, and place the offsets into sh_entsize fields: high bit means it
2334 static void layout_sections(struct module
*mod
, struct load_info
*info
)
2336 static unsigned long const masks
[][2] = {
2337 /* NOTE: all executable code must be the first section
2338 * in this array; otherwise modify the text_size
2339 * finder in the two loops below */
2340 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2341 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
2342 { SHF_RO_AFTER_INIT
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2343 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
2344 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
2348 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++)
2349 info
->sechdrs
[i
].sh_entsize
= ~0UL;
2351 pr_debug("Core section allocation order:\n");
2352 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2353 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2354 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2355 const char *sname
= info
->secstrings
+ s
->sh_name
;
2357 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2358 || (s
->sh_flags
& masks
[m
][1])
2359 || s
->sh_entsize
!= ~0UL
2360 || strstarts(sname
, ".init"))
2362 s
->sh_entsize
= get_offset(mod
, &mod
->core_layout
.size
, s
, i
);
2363 pr_debug("\t%s\n", sname
);
2366 case 0: /* executable */
2367 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2368 mod
->core_layout
.text_size
= mod
->core_layout
.size
;
2370 case 1: /* RO: text and ro-data */
2371 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2372 mod
->core_layout
.ro_size
= mod
->core_layout
.size
;
2374 case 2: /* RO after init */
2375 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2376 mod
->core_layout
.ro_after_init_size
= mod
->core_layout
.size
;
2378 case 4: /* whole core */
2379 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2384 pr_debug("Init section allocation order:\n");
2385 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
2386 for (i
= 0; i
< info
->hdr
->e_shnum
; ++i
) {
2387 Elf_Shdr
*s
= &info
->sechdrs
[i
];
2388 const char *sname
= info
->secstrings
+ s
->sh_name
;
2390 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
2391 || (s
->sh_flags
& masks
[m
][1])
2392 || s
->sh_entsize
!= ~0UL
2393 || !strstarts(sname
, ".init"))
2395 s
->sh_entsize
= (get_offset(mod
, &mod
->init_layout
.size
, s
, i
)
2396 | INIT_OFFSET_MASK
);
2397 pr_debug("\t%s\n", sname
);
2400 case 0: /* executable */
2401 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2402 mod
->init_layout
.text_size
= mod
->init_layout
.size
;
2404 case 1: /* RO: text and ro-data */
2405 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2406 mod
->init_layout
.ro_size
= mod
->init_layout
.size
;
2410 * RO after init doesn't apply to init_layout (only
2411 * core_layout), so it just takes the value of ro_size.
2413 mod
->init_layout
.ro_after_init_size
= mod
->init_layout
.ro_size
;
2415 case 4: /* whole init */
2416 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2422 static void set_license(struct module
*mod
, const char *license
)
2425 license
= "unspecified";
2427 if (!license_is_gpl_compatible(license
)) {
2428 if (!test_taint(TAINT_PROPRIETARY_MODULE
))
2429 pr_warn("%s: module license '%s' taints kernel.\n",
2430 mod
->name
, license
);
2431 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
2432 LOCKDEP_NOW_UNRELIABLE
);
2436 /* Parse tag=value strings from .modinfo section */
2437 static char *next_string(char *string
, unsigned long *secsize
)
2439 /* Skip non-zero chars */
2442 if ((*secsize
)-- <= 1)
2446 /* Skip any zero padding. */
2447 while (!string
[0]) {
2449 if ((*secsize
)-- <= 1)
2455 static char *get_modinfo(struct load_info
*info
, const char *tag
)
2458 unsigned int taglen
= strlen(tag
);
2459 Elf_Shdr
*infosec
= &info
->sechdrs
[info
->index
.info
];
2460 unsigned long size
= infosec
->sh_size
;
2462 for (p
= (char *)infosec
->sh_addr
; p
; p
= next_string(p
, &size
)) {
2463 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
2464 return p
+ taglen
+ 1;
2469 static void setup_modinfo(struct module
*mod
, struct load_info
*info
)
2471 struct module_attribute
*attr
;
2474 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2476 attr
->setup(mod
, get_modinfo(info
, attr
->attr
.name
));
2480 static void free_modinfo(struct module
*mod
)
2482 struct module_attribute
*attr
;
2485 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
2491 #ifdef CONFIG_KALLSYMS
2493 /* lookup symbol in given range of kernel_symbols */
2494 static const struct kernel_symbol
*lookup_symbol(const char *name
,
2495 const struct kernel_symbol
*start
,
2496 const struct kernel_symbol
*stop
)
2498 return bsearch(name
, start
, stop
- start
,
2499 sizeof(struct kernel_symbol
), cmp_name
);
2502 static int is_exported(const char *name
, unsigned long value
,
2503 const struct module
*mod
)
2505 const struct kernel_symbol
*ks
;
2507 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
2509 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
2510 return ks
!= NULL
&& ks
->value
== value
;
2514 static char elf_type(const Elf_Sym
*sym
, const struct load_info
*info
)
2516 const Elf_Shdr
*sechdrs
= info
->sechdrs
;
2518 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
2519 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
2524 if (sym
->st_shndx
== SHN_UNDEF
)
2526 if (sym
->st_shndx
== SHN_ABS
|| sym
->st_shndx
== info
->index
.pcpu
)
2528 if (sym
->st_shndx
>= SHN_LORESERVE
)
2530 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
2532 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
2533 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
2534 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
2536 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2541 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
2542 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
2547 if (strstarts(info
->secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
2554 static bool is_core_symbol(const Elf_Sym
*src
, const Elf_Shdr
*sechdrs
,
2555 unsigned int shnum
, unsigned int pcpundx
)
2557 const Elf_Shdr
*sec
;
2559 if (src
->st_shndx
== SHN_UNDEF
2560 || src
->st_shndx
>= shnum
2564 #ifdef CONFIG_KALLSYMS_ALL
2565 if (src
->st_shndx
== pcpundx
)
2569 sec
= sechdrs
+ src
->st_shndx
;
2570 if (!(sec
->sh_flags
& SHF_ALLOC
)
2571 #ifndef CONFIG_KALLSYMS_ALL
2572 || !(sec
->sh_flags
& SHF_EXECINSTR
)
2574 || (sec
->sh_entsize
& INIT_OFFSET_MASK
))
2581 * We only allocate and copy the strings needed by the parts of symtab
2582 * we keep. This is simple, but has the effect of making multiple
2583 * copies of duplicates. We could be more sophisticated, see
2584 * linux-kernel thread starting with
2585 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2587 static void layout_symtab(struct module
*mod
, struct load_info
*info
)
2589 Elf_Shdr
*symsect
= info
->sechdrs
+ info
->index
.sym
;
2590 Elf_Shdr
*strsect
= info
->sechdrs
+ info
->index
.str
;
2592 unsigned int i
, nsrc
, ndst
, strtab_size
= 0;
2594 /* Put symbol section at end of init part of module. */
2595 symsect
->sh_flags
|= SHF_ALLOC
;
2596 symsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, symsect
,
2597 info
->index
.sym
) | INIT_OFFSET_MASK
;
2598 pr_debug("\t%s\n", info
->secstrings
+ symsect
->sh_name
);
2600 src
= (void *)info
->hdr
+ symsect
->sh_offset
;
2601 nsrc
= symsect
->sh_size
/ sizeof(*src
);
2603 /* Compute total space required for the core symbols' strtab. */
2604 for (ndst
= i
= 0; i
< nsrc
; i
++) {
2605 if (i
== 0 || is_livepatch_module(mod
) ||
2606 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2607 info
->index
.pcpu
)) {
2608 strtab_size
+= strlen(&info
->strtab
[src
[i
].st_name
])+1;
2613 /* Append room for core symbols at end of core part. */
2614 info
->symoffs
= ALIGN(mod
->core_layout
.size
, symsect
->sh_addralign
?: 1);
2615 info
->stroffs
= mod
->core_layout
.size
= info
->symoffs
+ ndst
* sizeof(Elf_Sym
);
2616 mod
->core_layout
.size
+= strtab_size
;
2617 mod
->core_layout
.size
= debug_align(mod
->core_layout
.size
);
2619 /* Put string table section at end of init part of module. */
2620 strsect
->sh_flags
|= SHF_ALLOC
;
2621 strsect
->sh_entsize
= get_offset(mod
, &mod
->init_layout
.size
, strsect
,
2622 info
->index
.str
) | INIT_OFFSET_MASK
;
2623 pr_debug("\t%s\n", info
->secstrings
+ strsect
->sh_name
);
2625 /* We'll tack temporary mod_kallsyms on the end. */
2626 mod
->init_layout
.size
= ALIGN(mod
->init_layout
.size
,
2627 __alignof__(struct mod_kallsyms
));
2628 info
->mod_kallsyms_init_off
= mod
->init_layout
.size
;
2629 mod
->init_layout
.size
+= sizeof(struct mod_kallsyms
);
2630 mod
->init_layout
.size
= debug_align(mod
->init_layout
.size
);
2634 * We use the full symtab and strtab which layout_symtab arranged to
2635 * be appended to the init section. Later we switch to the cut-down
2638 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2640 unsigned int i
, ndst
;
2644 Elf_Shdr
*symsec
= &info
->sechdrs
[info
->index
.sym
];
2646 /* Set up to point into init section. */
2647 mod
->kallsyms
= mod
->init_layout
.base
+ info
->mod_kallsyms_init_off
;
2649 mod
->kallsyms
->symtab
= (void *)symsec
->sh_addr
;
2650 mod
->kallsyms
->num_symtab
= symsec
->sh_size
/ sizeof(Elf_Sym
);
2651 /* Make sure we get permanent strtab: don't use info->strtab. */
2652 mod
->kallsyms
->strtab
= (void *)info
->sechdrs
[info
->index
.str
].sh_addr
;
2654 /* Set types up while we still have access to sections. */
2655 for (i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++)
2656 mod
->kallsyms
->symtab
[i
].st_info
2657 = elf_type(&mod
->kallsyms
->symtab
[i
], info
);
2659 /* Now populate the cut down core kallsyms for after init. */
2660 mod
->core_kallsyms
.symtab
= dst
= mod
->core_layout
.base
+ info
->symoffs
;
2661 mod
->core_kallsyms
.strtab
= s
= mod
->core_layout
.base
+ info
->stroffs
;
2662 src
= mod
->kallsyms
->symtab
;
2663 for (ndst
= i
= 0; i
< mod
->kallsyms
->num_symtab
; i
++) {
2664 if (i
== 0 || is_livepatch_module(mod
) ||
2665 is_core_symbol(src
+i
, info
->sechdrs
, info
->hdr
->e_shnum
,
2666 info
->index
.pcpu
)) {
2668 dst
[ndst
++].st_name
= s
- mod
->core_kallsyms
.strtab
;
2669 s
+= strlcpy(s
, &mod
->kallsyms
->strtab
[src
[i
].st_name
],
2673 mod
->core_kallsyms
.num_symtab
= ndst
;
2676 static inline void layout_symtab(struct module
*mod
, struct load_info
*info
)
2680 static void add_kallsyms(struct module
*mod
, const struct load_info
*info
)
2683 #endif /* CONFIG_KALLSYMS */
2685 static void dynamic_debug_setup(struct _ddebug
*debug
, unsigned int num
)
2689 #ifdef CONFIG_DYNAMIC_DEBUG
2690 if (ddebug_add_module(debug
, num
, debug
->modname
))
2691 pr_err("dynamic debug error adding module: %s\n",
2696 static void dynamic_debug_remove(struct _ddebug
*debug
)
2699 ddebug_remove_module(debug
->modname
);
2702 void * __weak
module_alloc(unsigned long size
)
2704 return vmalloc_exec(size
);
2707 #ifdef CONFIG_DEBUG_KMEMLEAK
2708 static void kmemleak_load_module(const struct module
*mod
,
2709 const struct load_info
*info
)
2713 /* only scan the sections containing data */
2714 kmemleak_scan_area(mod
, sizeof(struct module
), GFP_KERNEL
);
2716 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2717 /* Scan all writable sections that's not executable */
2718 if (!(info
->sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
2719 !(info
->sechdrs
[i
].sh_flags
& SHF_WRITE
) ||
2720 (info
->sechdrs
[i
].sh_flags
& SHF_EXECINSTR
))
2723 kmemleak_scan_area((void *)info
->sechdrs
[i
].sh_addr
,
2724 info
->sechdrs
[i
].sh_size
, GFP_KERNEL
);
2728 static inline void kmemleak_load_module(const struct module
*mod
,
2729 const struct load_info
*info
)
2734 #ifdef CONFIG_MODULE_SIG
2735 static int module_sig_check(struct load_info
*info
, int flags
)
2738 const unsigned long markerlen
= sizeof(MODULE_SIG_STRING
) - 1;
2739 const void *mod
= info
->hdr
;
2742 * Require flags == 0, as a module with version information
2743 * removed is no longer the module that was signed
2746 info
->len
> markerlen
&&
2747 memcmp(mod
+ info
->len
- markerlen
, MODULE_SIG_STRING
, markerlen
) == 0) {
2748 /* We truncate the module to discard the signature */
2749 info
->len
-= markerlen
;
2750 err
= mod_verify_sig(mod
, &info
->len
);
2754 info
->sig_ok
= true;
2758 /* Not having a signature is only an error if we're strict. */
2759 if (err
== -ENOKEY
&& !sig_enforce
)
2764 #else /* !CONFIG_MODULE_SIG */
2765 static int module_sig_check(struct load_info
*info
, int flags
)
2769 #endif /* !CONFIG_MODULE_SIG */
2771 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2772 static int elf_header_check(struct load_info
*info
)
2774 if (info
->len
< sizeof(*(info
->hdr
)))
2777 if (memcmp(info
->hdr
->e_ident
, ELFMAG
, SELFMAG
) != 0
2778 || info
->hdr
->e_type
!= ET_REL
2779 || !elf_check_arch(info
->hdr
)
2780 || info
->hdr
->e_shentsize
!= sizeof(Elf_Shdr
))
2783 if (info
->hdr
->e_shoff
>= info
->len
2784 || (info
->hdr
->e_shnum
* sizeof(Elf_Shdr
) >
2785 info
->len
- info
->hdr
->e_shoff
))
2791 #define COPY_CHUNK_SIZE (16*PAGE_SIZE)
2793 static int copy_chunked_from_user(void *dst
, const void __user
*usrc
, unsigned long len
)
2796 unsigned long n
= min(len
, COPY_CHUNK_SIZE
);
2798 if (copy_from_user(dst
, usrc
, n
) != 0)
2808 #ifdef CONFIG_LIVEPATCH
2809 static int check_modinfo_livepatch(struct module
*mod
, struct load_info
*info
)
2811 if (get_modinfo(info
, "livepatch")) {
2813 add_taint_module(mod
, TAINT_LIVEPATCH
, LOCKDEP_STILL_OK
);
2814 pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n",
2820 #else /* !CONFIG_LIVEPATCH */
2821 static int check_modinfo_livepatch(struct module
*mod
, struct load_info
*info
)
2823 if (get_modinfo(info
, "livepatch")) {
2824 pr_err("%s: module is marked as livepatch module, but livepatch support is disabled",
2831 #endif /* CONFIG_LIVEPATCH */
2833 /* Sets info->hdr and info->len. */
2834 static int copy_module_from_user(const void __user
*umod
, unsigned long len
,
2835 struct load_info
*info
)
2840 if (info
->len
< sizeof(*(info
->hdr
)))
2843 err
= security_kernel_read_file(NULL
, READING_MODULE
);
2847 /* Suck in entire file: we'll want most of it. */
2848 info
->hdr
= __vmalloc(info
->len
,
2849 GFP_KERNEL
| __GFP_HIGHMEM
| __GFP_NOWARN
, PAGE_KERNEL
);
2853 if (copy_chunked_from_user(info
->hdr
, umod
, info
->len
) != 0) {
2861 static void free_copy(struct load_info
*info
)
2866 static int rewrite_section_headers(struct load_info
*info
, int flags
)
2870 /* This should always be true, but let's be sure. */
2871 info
->sechdrs
[0].sh_addr
= 0;
2873 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2874 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
2875 if (shdr
->sh_type
!= SHT_NOBITS
2876 && info
->len
< shdr
->sh_offset
+ shdr
->sh_size
) {
2877 pr_err("Module len %lu truncated\n", info
->len
);
2881 /* Mark all sections sh_addr with their address in the
2883 shdr
->sh_addr
= (size_t)info
->hdr
+ shdr
->sh_offset
;
2885 #ifndef CONFIG_MODULE_UNLOAD
2886 /* Don't load .exit sections */
2887 if (strstarts(info
->secstrings
+shdr
->sh_name
, ".exit"))
2888 shdr
->sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2892 /* Track but don't keep modinfo and version sections. */
2893 if (flags
& MODULE_INIT_IGNORE_MODVERSIONS
)
2894 info
->index
.vers
= 0; /* Pretend no __versions section! */
2896 info
->index
.vers
= find_sec(info
, "__versions");
2897 info
->index
.info
= find_sec(info
, ".modinfo");
2898 info
->sechdrs
[info
->index
.info
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2899 info
->sechdrs
[info
->index
.vers
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
2904 * Set up our basic convenience variables (pointers to section headers,
2905 * search for module section index etc), and do some basic section
2908 * Return the temporary module pointer (we'll replace it with the final
2909 * one when we move the module sections around).
2911 static struct module
*setup_load_info(struct load_info
*info
, int flags
)
2917 /* Set up the convenience variables */
2918 info
->sechdrs
= (void *)info
->hdr
+ info
->hdr
->e_shoff
;
2919 info
->secstrings
= (void *)info
->hdr
2920 + info
->sechdrs
[info
->hdr
->e_shstrndx
].sh_offset
;
2922 err
= rewrite_section_headers(info
, flags
);
2924 return ERR_PTR(err
);
2926 /* Find internal symbols and strings. */
2927 for (i
= 1; i
< info
->hdr
->e_shnum
; i
++) {
2928 if (info
->sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
2929 info
->index
.sym
= i
;
2930 info
->index
.str
= info
->sechdrs
[i
].sh_link
;
2931 info
->strtab
= (char *)info
->hdr
2932 + info
->sechdrs
[info
->index
.str
].sh_offset
;
2937 info
->index
.mod
= find_sec(info
, ".gnu.linkonce.this_module");
2938 if (!info
->index
.mod
) {
2939 pr_warn("No module found in object\n");
2940 return ERR_PTR(-ENOEXEC
);
2942 /* This is temporary: point mod into copy of data. */
2943 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
2945 if (info
->index
.sym
== 0) {
2946 pr_warn("%s: module has no symbols (stripped?)\n", mod
->name
);
2947 return ERR_PTR(-ENOEXEC
);
2950 info
->index
.pcpu
= find_pcpusec(info
);
2952 /* Check module struct version now, before we try to use module. */
2953 if (!check_modstruct_version(info
->sechdrs
, info
->index
.vers
, mod
))
2954 return ERR_PTR(-ENOEXEC
);
2959 static int check_modinfo(struct module
*mod
, struct load_info
*info
, int flags
)
2961 const char *modmagic
= get_modinfo(info
, "vermagic");
2964 if (flags
& MODULE_INIT_IGNORE_VERMAGIC
)
2967 /* This is allowed: modprobe --force will invalidate it. */
2969 err
= try_to_force_load(mod
, "bad vermagic");
2972 } else if (!same_magic(modmagic
, vermagic
, info
->index
.vers
)) {
2973 pr_err("%s: version magic '%s' should be '%s'\n",
2974 mod
->name
, modmagic
, vermagic
);
2978 if (!get_modinfo(info
, "intree")) {
2979 if (!test_taint(TAINT_OOT_MODULE
))
2980 pr_warn("%s: loading out-of-tree module taints kernel.\n",
2982 add_taint_module(mod
, TAINT_OOT_MODULE
, LOCKDEP_STILL_OK
);
2985 if (get_modinfo(info
, "staging")) {
2986 add_taint_module(mod
, TAINT_CRAP
, LOCKDEP_STILL_OK
);
2987 pr_warn("%s: module is from the staging directory, the quality "
2988 "is unknown, you have been warned.\n", mod
->name
);
2991 err
= check_modinfo_livepatch(mod
, info
);
2995 /* Set up license info based on the info section */
2996 set_license(mod
, get_modinfo(info
, "license"));
3001 static int find_module_sections(struct module
*mod
, struct load_info
*info
)
3003 mod
->kp
= section_objs(info
, "__param",
3004 sizeof(*mod
->kp
), &mod
->num_kp
);
3005 mod
->syms
= section_objs(info
, "__ksymtab",
3006 sizeof(*mod
->syms
), &mod
->num_syms
);
3007 mod
->crcs
= section_addr(info
, "__kcrctab");
3008 mod
->gpl_syms
= section_objs(info
, "__ksymtab_gpl",
3009 sizeof(*mod
->gpl_syms
),
3010 &mod
->num_gpl_syms
);
3011 mod
->gpl_crcs
= section_addr(info
, "__kcrctab_gpl");
3012 mod
->gpl_future_syms
= section_objs(info
,
3013 "__ksymtab_gpl_future",
3014 sizeof(*mod
->gpl_future_syms
),
3015 &mod
->num_gpl_future_syms
);
3016 mod
->gpl_future_crcs
= section_addr(info
, "__kcrctab_gpl_future");
3018 #ifdef CONFIG_UNUSED_SYMBOLS
3019 mod
->unused_syms
= section_objs(info
, "__ksymtab_unused",
3020 sizeof(*mod
->unused_syms
),
3021 &mod
->num_unused_syms
);
3022 mod
->unused_crcs
= section_addr(info
, "__kcrctab_unused");
3023 mod
->unused_gpl_syms
= section_objs(info
, "__ksymtab_unused_gpl",
3024 sizeof(*mod
->unused_gpl_syms
),
3025 &mod
->num_unused_gpl_syms
);
3026 mod
->unused_gpl_crcs
= section_addr(info
, "__kcrctab_unused_gpl");
3028 #ifdef CONFIG_CONSTRUCTORS
3029 mod
->ctors
= section_objs(info
, ".ctors",
3030 sizeof(*mod
->ctors
), &mod
->num_ctors
);
3032 mod
->ctors
= section_objs(info
, ".init_array",
3033 sizeof(*mod
->ctors
), &mod
->num_ctors
);
3034 else if (find_sec(info
, ".init_array")) {
3036 * This shouldn't happen with same compiler and binutils
3037 * building all parts of the module.
3039 pr_warn("%s: has both .ctors and .init_array.\n",
3045 #ifdef CONFIG_TRACEPOINTS
3046 mod
->tracepoints_ptrs
= section_objs(info
, "__tracepoints_ptrs",
3047 sizeof(*mod
->tracepoints_ptrs
),
3048 &mod
->num_tracepoints
);
3050 #ifdef HAVE_JUMP_LABEL
3051 mod
->jump_entries
= section_objs(info
, "__jump_table",
3052 sizeof(*mod
->jump_entries
),
3053 &mod
->num_jump_entries
);
3055 #ifdef CONFIG_EVENT_TRACING
3056 mod
->trace_events
= section_objs(info
, "_ftrace_events",
3057 sizeof(*mod
->trace_events
),
3058 &mod
->num_trace_events
);
3059 mod
->trace_enums
= section_objs(info
, "_ftrace_enum_map",
3060 sizeof(*mod
->trace_enums
),
3061 &mod
->num_trace_enums
);
3063 #ifdef CONFIG_TRACING
3064 mod
->trace_bprintk_fmt_start
= section_objs(info
, "__trace_printk_fmt",
3065 sizeof(*mod
->trace_bprintk_fmt_start
),
3066 &mod
->num_trace_bprintk_fmt
);
3068 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
3069 /* sechdrs[0].sh_size is always zero */
3070 mod
->ftrace_callsites
= section_objs(info
, "__mcount_loc",
3071 sizeof(*mod
->ftrace_callsites
),
3072 &mod
->num_ftrace_callsites
);
3075 mod
->extable
= section_objs(info
, "__ex_table",
3076 sizeof(*mod
->extable
), &mod
->num_exentries
);
3078 if (section_addr(info
, "__obsparm"))
3079 pr_warn("%s: Ignoring obsolete parameters\n", mod
->name
);
3081 info
->debug
= section_objs(info
, "__verbose",
3082 sizeof(*info
->debug
), &info
->num_debug
);
3087 static int move_module(struct module
*mod
, struct load_info
*info
)
3092 /* Do the allocs. */
3093 ptr
= module_alloc(mod
->core_layout
.size
);
3095 * The pointer to this block is stored in the module structure
3096 * which is inside the block. Just mark it as not being a
3099 kmemleak_not_leak(ptr
);
3103 memset(ptr
, 0, mod
->core_layout
.size
);
3104 mod
->core_layout
.base
= ptr
;
3106 if (mod
->init_layout
.size
) {
3107 ptr
= module_alloc(mod
->init_layout
.size
);
3109 * The pointer to this block is stored in the module structure
3110 * which is inside the block. This block doesn't need to be
3111 * scanned as it contains data and code that will be freed
3112 * after the module is initialized.
3114 kmemleak_ignore(ptr
);
3116 module_memfree(mod
->core_layout
.base
);
3119 memset(ptr
, 0, mod
->init_layout
.size
);
3120 mod
->init_layout
.base
= ptr
;
3122 mod
->init_layout
.base
= NULL
;
3124 /* Transfer each section which specifies SHF_ALLOC */
3125 pr_debug("final section addresses:\n");
3126 for (i
= 0; i
< info
->hdr
->e_shnum
; i
++) {
3128 Elf_Shdr
*shdr
= &info
->sechdrs
[i
];
3130 if (!(shdr
->sh_flags
& SHF_ALLOC
))
3133 if (shdr
->sh_entsize
& INIT_OFFSET_MASK
)
3134 dest
= mod
->init_layout
.base
3135 + (shdr
->sh_entsize
& ~INIT_OFFSET_MASK
);
3137 dest
= mod
->core_layout
.base
+ shdr
->sh_entsize
;
3139 if (shdr
->sh_type
!= SHT_NOBITS
)
3140 memcpy(dest
, (void *)shdr
->sh_addr
, shdr
->sh_size
);
3141 /* Update sh_addr to point to copy in image. */
3142 shdr
->sh_addr
= (unsigned long)dest
;
3143 pr_debug("\t0x%lx %s\n",
3144 (long)shdr
->sh_addr
, info
->secstrings
+ shdr
->sh_name
);
3150 static int check_module_license_and_versions(struct module
*mod
)
3152 int prev_taint
= test_taint(TAINT_PROPRIETARY_MODULE
);
3155 * ndiswrapper is under GPL by itself, but loads proprietary modules.
3156 * Don't use add_taint_module(), as it would prevent ndiswrapper from
3157 * using GPL-only symbols it needs.
3159 if (strcmp(mod
->name
, "ndiswrapper") == 0)
3160 add_taint(TAINT_PROPRIETARY_MODULE
, LOCKDEP_NOW_UNRELIABLE
);
3162 /* driverloader was caught wrongly pretending to be under GPL */
3163 if (strcmp(mod
->name
, "driverloader") == 0)
3164 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3165 LOCKDEP_NOW_UNRELIABLE
);
3167 /* lve claims to be GPL but upstream won't provide source */
3168 if (strcmp(mod
->name
, "lve") == 0)
3169 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
,
3170 LOCKDEP_NOW_UNRELIABLE
);
3172 if (!prev_taint
&& test_taint(TAINT_PROPRIETARY_MODULE
))
3173 pr_warn("%s: module license taints kernel.\n", mod
->name
);
3175 #ifdef CONFIG_MODVERSIONS
3176 if ((mod
->num_syms
&& !mod
->crcs
)
3177 || (mod
->num_gpl_syms
&& !mod
->gpl_crcs
)
3178 || (mod
->num_gpl_future_syms
&& !mod
->gpl_future_crcs
)
3179 #ifdef CONFIG_UNUSED_SYMBOLS
3180 || (mod
->num_unused_syms
&& !mod
->unused_crcs
)
3181 || (mod
->num_unused_gpl_syms
&& !mod
->unused_gpl_crcs
)
3184 return try_to_force_load(mod
,
3185 "no versions for exported symbols");
3191 static void flush_module_icache(const struct module
*mod
)
3193 mm_segment_t old_fs
;
3195 /* flush the icache in correct context */
3200 * Flush the instruction cache, since we've played with text.
3201 * Do it before processing of module parameters, so the module
3202 * can provide parameter accessor functions of its own.
3204 if (mod
->init_layout
.base
)
3205 flush_icache_range((unsigned long)mod
->init_layout
.base
,
3206 (unsigned long)mod
->init_layout
.base
3207 + mod
->init_layout
.size
);
3208 flush_icache_range((unsigned long)mod
->core_layout
.base
,
3209 (unsigned long)mod
->core_layout
.base
+ mod
->core_layout
.size
);
3214 int __weak
module_frob_arch_sections(Elf_Ehdr
*hdr
,
3222 /* module_blacklist is a comma-separated list of module names */
3223 static char *module_blacklist
;
3224 static bool blacklisted(char *module_name
)
3229 if (!module_blacklist
)
3232 for (p
= module_blacklist
; *p
; p
+= len
) {
3233 len
= strcspn(p
, ",");
3234 if (strlen(module_name
) == len
&& !memcmp(module_name
, p
, len
))
3241 core_param(module_blacklist
, module_blacklist
, charp
, 0400);
3243 static struct module
*layout_and_allocate(struct load_info
*info
, int flags
)
3245 /* Module within temporary copy. */
3250 mod
= setup_load_info(info
, flags
);
3254 if (blacklisted(mod
->name
))
3255 return ERR_PTR(-EPERM
);
3257 err
= check_modinfo(mod
, info
, flags
);
3259 return ERR_PTR(err
);
3261 /* Allow arches to frob section contents and sizes. */
3262 err
= module_frob_arch_sections(info
->hdr
, info
->sechdrs
,
3263 info
->secstrings
, mod
);
3265 return ERR_PTR(err
);
3267 /* We will do a special allocation for per-cpu sections later. */
3268 info
->sechdrs
[info
->index
.pcpu
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
3271 * Mark ro_after_init section with SHF_RO_AFTER_INIT so that
3272 * layout_sections() can put it in the right place.
3273 * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set.
3275 ndx
= find_sec(info
, ".data..ro_after_init");
3277 info
->sechdrs
[ndx
].sh_flags
|= SHF_RO_AFTER_INIT
;
3279 /* Determine total sizes, and put offsets in sh_entsize. For now
3280 this is done generically; there doesn't appear to be any
3281 special cases for the architectures. */
3282 layout_sections(mod
, info
);
3283 layout_symtab(mod
, info
);
3285 /* Allocate and move to the final place */
3286 err
= move_module(mod
, info
);
3288 return ERR_PTR(err
);
3290 /* Module has been copied to its final place now: return it. */
3291 mod
= (void *)info
->sechdrs
[info
->index
.mod
].sh_addr
;
3292 kmemleak_load_module(mod
, info
);
3296 /* mod is no longer valid after this! */
3297 static void module_deallocate(struct module
*mod
, struct load_info
*info
)
3299 percpu_modfree(mod
);
3300 module_arch_freeing_init(mod
);
3301 module_memfree(mod
->init_layout
.base
);
3302 module_memfree(mod
->core_layout
.base
);
3305 int __weak
module_finalize(const Elf_Ehdr
*hdr
,
3306 const Elf_Shdr
*sechdrs
,
3312 static int post_relocation(struct module
*mod
, const struct load_info
*info
)
3314 /* Sort exception table now relocations are done. */
3315 sort_extable(mod
->extable
, mod
->extable
+ mod
->num_exentries
);
3317 /* Copy relocated percpu area over. */
3318 percpu_modcopy(mod
, (void *)info
->sechdrs
[info
->index
.pcpu
].sh_addr
,
3319 info
->sechdrs
[info
->index
.pcpu
].sh_size
);
3321 /* Setup kallsyms-specific fields. */
3322 add_kallsyms(mod
, info
);
3324 /* Arch-specific module finalizing. */
3325 return module_finalize(info
->hdr
, info
->sechdrs
, mod
);
3328 /* Is this module of this name done loading? No locks held. */
3329 static bool finished_loading(const char *name
)
3335 * The module_mutex should not be a heavily contended lock;
3336 * if we get the occasional sleep here, we'll go an extra iteration
3337 * in the wait_event_interruptible(), which is harmless.
3339 sched_annotate_sleep();
3340 mutex_lock(&module_mutex
);
3341 mod
= find_module_all(name
, strlen(name
), true);
3342 ret
= !mod
|| mod
->state
== MODULE_STATE_LIVE
3343 || mod
->state
== MODULE_STATE_GOING
;
3344 mutex_unlock(&module_mutex
);
3349 /* Call module constructors. */
3350 static void do_mod_ctors(struct module
*mod
)
3352 #ifdef CONFIG_CONSTRUCTORS
3355 for (i
= 0; i
< mod
->num_ctors
; i
++)
3360 /* For freeing module_init on success, in case kallsyms traversing */
3361 struct mod_initfree
{
3362 struct rcu_head rcu
;
3366 static void do_free_init(struct rcu_head
*head
)
3368 struct mod_initfree
*m
= container_of(head
, struct mod_initfree
, rcu
);
3369 module_memfree(m
->module_init
);
3374 * This is where the real work happens.
3376 * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
3377 * helper command 'lx-symbols'.
3379 static noinline
int do_init_module(struct module
*mod
)
3382 struct mod_initfree
*freeinit
;
3384 freeinit
= kmalloc(sizeof(*freeinit
), GFP_KERNEL
);
3389 freeinit
->module_init
= mod
->init_layout
.base
;
3392 * We want to find out whether @mod uses async during init. Clear
3393 * PF_USED_ASYNC. async_schedule*() will set it.
3395 current
->flags
&= ~PF_USED_ASYNC
;
3398 /* Start the module */
3399 if (mod
->init
!= NULL
)
3400 ret
= do_one_initcall(mod
->init
);
3402 goto fail_free_freeinit
;
3405 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3406 "follow 0/-E convention\n"
3407 "%s: loading module anyway...\n",
3408 __func__
, mod
->name
, ret
, __func__
);
3412 /* Now it's a first class citizen! */
3413 mod
->state
= MODULE_STATE_LIVE
;
3414 blocking_notifier_call_chain(&module_notify_list
,
3415 MODULE_STATE_LIVE
, mod
);
3418 * We need to finish all async code before the module init sequence
3419 * is done. This has potential to deadlock. For example, a newly
3420 * detected block device can trigger request_module() of the
3421 * default iosched from async probing task. Once userland helper
3422 * reaches here, async_synchronize_full() will wait on the async
3423 * task waiting on request_module() and deadlock.
3425 * This deadlock is avoided by perfomring async_synchronize_full()
3426 * iff module init queued any async jobs. This isn't a full
3427 * solution as it will deadlock the same if module loading from
3428 * async jobs nests more than once; however, due to the various
3429 * constraints, this hack seems to be the best option for now.
3430 * Please refer to the following thread for details.
3432 * http://thread.gmane.org/gmane.linux.kernel/1420814
3434 if (!mod
->async_probe_requested
&& (current
->flags
& PF_USED_ASYNC
))
3435 async_synchronize_full();
3437 mutex_lock(&module_mutex
);
3438 /* Drop initial reference. */
3440 trim_init_extable(mod
);
3441 #ifdef CONFIG_KALLSYMS
3442 /* Switch to core kallsyms now init is done: kallsyms may be walking! */
3443 rcu_assign_pointer(mod
->kallsyms
, &mod
->core_kallsyms
);
3445 module_enable_ro(mod
, true);
3446 mod_tree_remove_init(mod
);
3447 disable_ro_nx(&mod
->init_layout
);
3448 module_arch_freeing_init(mod
);
3449 mod
->init_layout
.base
= NULL
;
3450 mod
->init_layout
.size
= 0;
3451 mod
->init_layout
.ro_size
= 0;
3452 mod
->init_layout
.ro_after_init_size
= 0;
3453 mod
->init_layout
.text_size
= 0;
3455 * We want to free module_init, but be aware that kallsyms may be
3456 * walking this with preempt disabled. In all the failure paths, we
3457 * call synchronize_sched(), but we don't want to slow down the success
3458 * path, so use actual RCU here.
3460 call_rcu_sched(&freeinit
->rcu
, do_free_init
);
3461 mutex_unlock(&module_mutex
);
3462 wake_up_all(&module_wq
);
3469 /* Try to protect us from buggy refcounters. */
3470 mod
->state
= MODULE_STATE_GOING
;
3471 synchronize_sched();
3473 blocking_notifier_call_chain(&module_notify_list
,
3474 MODULE_STATE_GOING
, mod
);
3475 klp_module_going(mod
);
3476 ftrace_release_mod(mod
);
3478 wake_up_all(&module_wq
);
3482 static int may_init_module(void)
3484 if (!capable(CAP_SYS_MODULE
) || modules_disabled
)
3491 * We try to place it in the list now to make sure it's unique before
3492 * we dedicate too many resources. In particular, temporary percpu
3493 * memory exhaustion.
3495 static int add_unformed_module(struct module
*mod
)
3500 mod
->state
= MODULE_STATE_UNFORMED
;
3503 mutex_lock(&module_mutex
);
3504 old
= find_module_all(mod
->name
, strlen(mod
->name
), true);
3506 if (old
->state
== MODULE_STATE_COMING
3507 || old
->state
== MODULE_STATE_UNFORMED
) {
3508 /* Wait in case it fails to load. */
3509 mutex_unlock(&module_mutex
);
3510 err
= wait_event_interruptible(module_wq
,
3511 finished_loading(mod
->name
));
3519 mod_update_bounds(mod
);
3520 list_add_rcu(&mod
->list
, &modules
);
3521 mod_tree_insert(mod
);
3525 mutex_unlock(&module_mutex
);
3530 static int complete_formation(struct module
*mod
, struct load_info
*info
)
3534 mutex_lock(&module_mutex
);
3536 /* Find duplicate symbols (must be called under lock). */
3537 err
= verify_export_symbols(mod
);
3541 /* This relies on module_mutex for list integrity. */
3542 module_bug_finalize(info
->hdr
, info
->sechdrs
, mod
);
3544 module_enable_ro(mod
, false);
3545 module_enable_nx(mod
);
3547 /* Mark state as coming so strong_try_module_get() ignores us,
3548 * but kallsyms etc. can see us. */
3549 mod
->state
= MODULE_STATE_COMING
;
3550 mutex_unlock(&module_mutex
);
3555 mutex_unlock(&module_mutex
);
3559 static int prepare_coming_module(struct module
*mod
)
3563 ftrace_module_enable(mod
);
3564 err
= klp_module_coming(mod
);
3568 blocking_notifier_call_chain(&module_notify_list
,
3569 MODULE_STATE_COMING
, mod
);
3573 static int unknown_module_param_cb(char *param
, char *val
, const char *modname
,
3576 struct module
*mod
= arg
;
3579 if (strcmp(param
, "async_probe") == 0) {
3580 mod
->async_probe_requested
= true;
3584 /* Check for magic 'dyndbg' arg */
3585 ret
= ddebug_dyndbg_module_param_cb(param
, val
, modname
);
3587 pr_warn("%s: unknown parameter '%s' ignored\n", modname
, param
);
3591 /* Allocate and load the module: note that size of section 0 is always
3592 zero, and we rely on this for optional sections. */
3593 static int load_module(struct load_info
*info
, const char __user
*uargs
,
3600 err
= module_sig_check(info
, flags
);
3604 err
= elf_header_check(info
);
3608 /* Figure out module layout, and allocate all the memory. */
3609 mod
= layout_and_allocate(info
, flags
);
3615 audit_log_kern_module(mod
->name
);
3617 /* Reserve our place in the list. */
3618 err
= add_unformed_module(mod
);
3622 #ifdef CONFIG_MODULE_SIG
3623 mod
->sig_ok
= info
->sig_ok
;
3625 pr_notice_once("%s: module verification failed: signature "
3626 "and/or required key missing - tainting "
3627 "kernel\n", mod
->name
);
3628 add_taint_module(mod
, TAINT_UNSIGNED_MODULE
, LOCKDEP_STILL_OK
);
3632 /* To avoid stressing percpu allocator, do this once we're unique. */
3633 err
= percpu_modalloc(mod
, info
);
3637 /* Now module is in final location, initialize linked lists, etc. */
3638 err
= module_unload_init(mod
);
3642 init_param_lock(mod
);
3644 /* Now we've got everything in the final locations, we can
3645 * find optional sections. */
3646 err
= find_module_sections(mod
, info
);
3650 err
= check_module_license_and_versions(mod
);
3654 /* Set up MODINFO_ATTR fields */
3655 setup_modinfo(mod
, info
);
3657 /* Fix up syms, so that st_value is a pointer to location. */
3658 err
= simplify_symbols(mod
, info
);
3662 err
= apply_relocations(mod
, info
);
3666 err
= post_relocation(mod
, info
);
3670 flush_module_icache(mod
);
3672 /* Now copy in args */
3673 mod
->args
= strndup_user(uargs
, ~0UL >> 1);
3674 if (IS_ERR(mod
->args
)) {
3675 err
= PTR_ERR(mod
->args
);
3676 goto free_arch_cleanup
;
3679 dynamic_debug_setup(info
->debug
, info
->num_debug
);
3681 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3682 ftrace_module_init(mod
);
3684 /* Finally it's fully formed, ready to start executing. */
3685 err
= complete_formation(mod
, info
);
3687 goto ddebug_cleanup
;
3689 err
= prepare_coming_module(mod
);
3693 /* Module is ready to execute: parsing args may do that. */
3694 after_dashes
= parse_args(mod
->name
, mod
->args
, mod
->kp
, mod
->num_kp
,
3696 unknown_module_param_cb
);
3697 if (IS_ERR(after_dashes
)) {
3698 err
= PTR_ERR(after_dashes
);
3699 goto coming_cleanup
;
3700 } else if (after_dashes
) {
3701 pr_warn("%s: parameters '%s' after `--' ignored\n",
3702 mod
->name
, after_dashes
);
3705 /* Link in to sysfs. */
3706 err
= mod_sysfs_setup(mod
, info
, mod
->kp
, mod
->num_kp
);
3708 goto coming_cleanup
;
3710 if (is_livepatch_module(mod
)) {
3711 err
= copy_module_elf(mod
, info
);
3716 /* Get rid of temporary copy. */
3720 trace_module_load(mod
);
3722 return do_init_module(mod
);
3725 mod_sysfs_teardown(mod
);
3727 mod
->state
= MODULE_STATE_GOING
;
3728 destroy_params(mod
->kp
, mod
->num_kp
);
3729 blocking_notifier_call_chain(&module_notify_list
,
3730 MODULE_STATE_GOING
, mod
);
3731 klp_module_going(mod
);
3733 /* module_bug_cleanup needs module_mutex protection */
3734 mutex_lock(&module_mutex
);
3735 module_bug_cleanup(mod
);
3736 mutex_unlock(&module_mutex
);
3738 /* we can't deallocate the module until we clear memory protection */
3739 module_disable_ro(mod
);
3740 module_disable_nx(mod
);
3743 dynamic_debug_remove(info
->debug
);
3744 synchronize_sched();
3747 module_arch_cleanup(mod
);
3751 module_unload_free(mod
);
3753 mutex_lock(&module_mutex
);
3754 /* Unlink carefully: kallsyms could be walking list. */
3755 list_del_rcu(&mod
->list
);
3756 mod_tree_remove(mod
);
3757 wake_up_all(&module_wq
);
3758 /* Wait for RCU-sched synchronizing before releasing mod->list. */
3759 synchronize_sched();
3760 mutex_unlock(&module_mutex
);
3763 * Ftrace needs to clean up what it initialized.
3764 * This does nothing if ftrace_module_init() wasn't called,
3765 * but it must be called outside of module_mutex.
3767 ftrace_release_mod(mod
);
3768 /* Free lock-classes; relies on the preceding sync_rcu() */
3769 lockdep_free_key_range(mod
->core_layout
.base
, mod
->core_layout
.size
);
3771 module_deallocate(mod
, info
);
3777 SYSCALL_DEFINE3(init_module
, void __user
*, umod
,
3778 unsigned long, len
, const char __user
*, uargs
)
3781 struct load_info info
= { };
3783 err
= may_init_module();
3787 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3790 err
= copy_module_from_user(umod
, len
, &info
);
3794 return load_module(&info
, uargs
, 0);
3797 SYSCALL_DEFINE3(finit_module
, int, fd
, const char __user
*, uargs
, int, flags
)
3799 struct load_info info
= { };
3804 err
= may_init_module();
3808 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd
, uargs
, flags
);
3810 if (flags
& ~(MODULE_INIT_IGNORE_MODVERSIONS
3811 |MODULE_INIT_IGNORE_VERMAGIC
))
3814 err
= kernel_read_file_from_fd(fd
, &hdr
, &size
, INT_MAX
,
3821 return load_module(&info
, uargs
, flags
);
3824 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
3826 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
3829 #ifdef CONFIG_KALLSYMS
3831 * This ignores the intensely annoying "mapping symbols" found
3832 * in ARM ELF files: $a, $t and $d.
3834 static inline int is_arm_mapping_symbol(const char *str
)
3836 if (str
[0] == '.' && str
[1] == 'L')
3838 return str
[0] == '$' && strchr("axtd", str
[1])
3839 && (str
[2] == '\0' || str
[2] == '.');
3842 static const char *symname(struct mod_kallsyms
*kallsyms
, unsigned int symnum
)
3844 return kallsyms
->strtab
+ kallsyms
->symtab
[symnum
].st_name
;
3847 static const char *get_ksymbol(struct module
*mod
,
3849 unsigned long *size
,
3850 unsigned long *offset
)
3852 unsigned int i
, best
= 0;
3853 unsigned long nextval
;
3854 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3856 /* At worse, next value is at end of module */
3857 if (within_module_init(addr
, mod
))
3858 nextval
= (unsigned long)mod
->init_layout
.base
+mod
->init_layout
.text_size
;
3860 nextval
= (unsigned long)mod
->core_layout
.base
+mod
->core_layout
.text_size
;
3862 /* Scan for closest preceding symbol, and next symbol. (ELF
3863 starts real symbols at 1). */
3864 for (i
= 1; i
< kallsyms
->num_symtab
; i
++) {
3865 if (kallsyms
->symtab
[i
].st_shndx
== SHN_UNDEF
)
3868 /* We ignore unnamed symbols: they're uninformative
3869 * and inserted at a whim. */
3870 if (*symname(kallsyms
, i
) == '\0'
3871 || is_arm_mapping_symbol(symname(kallsyms
, i
)))
3874 if (kallsyms
->symtab
[i
].st_value
<= addr
3875 && kallsyms
->symtab
[i
].st_value
> kallsyms
->symtab
[best
].st_value
)
3877 if (kallsyms
->symtab
[i
].st_value
> addr
3878 && kallsyms
->symtab
[i
].st_value
< nextval
)
3879 nextval
= kallsyms
->symtab
[i
].st_value
;
3886 *size
= nextval
- kallsyms
->symtab
[best
].st_value
;
3888 *offset
= addr
- kallsyms
->symtab
[best
].st_value
;
3889 return symname(kallsyms
, best
);
3892 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3893 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3894 const char *module_address_lookup(unsigned long addr
,
3895 unsigned long *size
,
3896 unsigned long *offset
,
3900 const char *ret
= NULL
;
3904 mod
= __module_address(addr
);
3907 *modname
= mod
->name
;
3908 ret
= get_ksymbol(mod
, addr
, size
, offset
);
3910 /* Make a copy in here where it's safe */
3912 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
3920 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
3925 list_for_each_entry_rcu(mod
, &modules
, list
) {
3926 if (mod
->state
== MODULE_STATE_UNFORMED
)
3928 if (within_module(addr
, mod
)) {
3931 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
3934 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
3944 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
3945 unsigned long *offset
, char *modname
, char *name
)
3950 list_for_each_entry_rcu(mod
, &modules
, list
) {
3951 if (mod
->state
== MODULE_STATE_UNFORMED
)
3953 if (within_module(addr
, mod
)) {
3956 sym
= get_ksymbol(mod
, addr
, size
, offset
);
3960 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
3962 strlcpy(name
, sym
, KSYM_NAME_LEN
);
3972 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
3973 char *name
, char *module_name
, int *exported
)
3978 list_for_each_entry_rcu(mod
, &modules
, list
) {
3979 struct mod_kallsyms
*kallsyms
;
3981 if (mod
->state
== MODULE_STATE_UNFORMED
)
3983 kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
3984 if (symnum
< kallsyms
->num_symtab
) {
3985 *value
= kallsyms
->symtab
[symnum
].st_value
;
3986 *type
= kallsyms
->symtab
[symnum
].st_info
;
3987 strlcpy(name
, symname(kallsyms
, symnum
), KSYM_NAME_LEN
);
3988 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
3989 *exported
= is_exported(name
, *value
, mod
);
3993 symnum
-= kallsyms
->num_symtab
;
3999 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
4002 struct mod_kallsyms
*kallsyms
= rcu_dereference_sched(mod
->kallsyms
);
4004 for (i
= 0; i
< kallsyms
->num_symtab
; i
++)
4005 if (strcmp(name
, symname(kallsyms
, i
)) == 0 &&
4006 kallsyms
->symtab
[i
].st_info
!= 'U')
4007 return kallsyms
->symtab
[i
].st_value
;
4011 /* Look for this name: can be of form module:name. */
4012 unsigned long module_kallsyms_lookup_name(const char *name
)
4016 unsigned long ret
= 0;
4018 /* Don't lock: we're in enough trouble already. */
4020 if ((colon
= strchr(name
, ':')) != NULL
) {
4021 if ((mod
= find_module_all(name
, colon
- name
, false)) != NULL
)
4022 ret
= mod_find_symname(mod
, colon
+1);
4024 list_for_each_entry_rcu(mod
, &modules
, list
) {
4025 if (mod
->state
== MODULE_STATE_UNFORMED
)
4027 if ((ret
= mod_find_symname(mod
, name
)) != 0)
4035 int module_kallsyms_on_each_symbol(int (*fn
)(void *, const char *,
4036 struct module
*, unsigned long),
4043 module_assert_mutex();
4045 list_for_each_entry(mod
, &modules
, list
) {
4046 /* We hold module_mutex: no need for rcu_dereference_sched */
4047 struct mod_kallsyms
*kallsyms
= mod
->kallsyms
;
4049 if (mod
->state
== MODULE_STATE_UNFORMED
)
4051 for (i
= 0; i
< kallsyms
->num_symtab
; i
++) {
4052 ret
= fn(data
, symname(kallsyms
, i
),
4053 mod
, kallsyms
->symtab
[i
].st_value
);
4060 #endif /* CONFIG_KALLSYMS */
4062 /* Maximum number of characters written by module_flags() */
4063 #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
4065 /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */
4066 static char *module_flags(struct module
*mod
, char *buf
)
4070 BUG_ON(mod
->state
== MODULE_STATE_UNFORMED
);
4072 mod
->state
== MODULE_STATE_GOING
||
4073 mod
->state
== MODULE_STATE_COMING
) {
4075 bx
+= module_flags_taint(mod
, buf
+ bx
);
4076 /* Show a - for module-is-being-unloaded */
4077 if (mod
->state
== MODULE_STATE_GOING
)
4079 /* Show a + for module-is-being-loaded */
4080 if (mod
->state
== MODULE_STATE_COMING
)
4089 #ifdef CONFIG_PROC_FS
4090 /* Called by the /proc file system to return a list of modules. */
4091 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
4093 mutex_lock(&module_mutex
);
4094 return seq_list_start(&modules
, *pos
);
4097 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
4099 return seq_list_next(p
, &modules
, pos
);
4102 static void m_stop(struct seq_file
*m
, void *p
)
4104 mutex_unlock(&module_mutex
);
4107 static int m_show(struct seq_file
*m
, void *p
)
4109 struct module
*mod
= list_entry(p
, struct module
, list
);
4110 char buf
[MODULE_FLAGS_BUF_SIZE
];
4112 /* We always ignore unformed modules. */
4113 if (mod
->state
== MODULE_STATE_UNFORMED
)
4116 seq_printf(m
, "%s %u",
4117 mod
->name
, mod
->init_layout
.size
+ mod
->core_layout
.size
);
4118 print_unload_info(m
, mod
);
4120 /* Informative for users. */
4121 seq_printf(m
, " %s",
4122 mod
->state
== MODULE_STATE_GOING
? "Unloading" :
4123 mod
->state
== MODULE_STATE_COMING
? "Loading" :
4125 /* Used by oprofile and other similar tools. */
4126 seq_printf(m
, " 0x%pK", mod
->core_layout
.base
);
4130 seq_printf(m
, " %s", module_flags(mod
, buf
));
4136 /* Format: modulename size refcount deps address
4138 Where refcount is a number or -, and deps is a comma-separated list
4141 static const struct seq_operations modules_op
= {
4148 static int modules_open(struct inode
*inode
, struct file
*file
)
4150 return seq_open(file
, &modules_op
);
4153 static const struct file_operations proc_modules_operations
= {
4154 .open
= modules_open
,
4156 .llseek
= seq_lseek
,
4157 .release
= seq_release
,
4160 static int __init
proc_modules_init(void)
4162 proc_create("modules", 0, NULL
, &proc_modules_operations
);
4165 module_init(proc_modules_init
);
4168 /* Given an address, look for it in the module exception tables. */
4169 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
4171 const struct exception_table_entry
*e
= NULL
;
4175 mod
= __module_address(addr
);
4179 if (!mod
->num_exentries
)
4182 e
= search_extable(mod
->extable
,
4183 mod
->extable
+ mod
->num_exentries
- 1,
4189 * Now, if we found one, we are running inside it now, hence
4190 * we cannot unload the module, hence no refcnt needed.
4196 * is_module_address - is this address inside a module?
4197 * @addr: the address to check.
4199 * See is_module_text_address() if you simply want to see if the address
4200 * is code (not data).
4202 bool is_module_address(unsigned long addr
)
4207 ret
= __module_address(addr
) != NULL
;
4214 * __module_address - get the module which contains an address.
4215 * @addr: the address.
4217 * Must be called with preempt disabled or module mutex held so that
4218 * module doesn't get freed during this.
4220 struct module
*__module_address(unsigned long addr
)
4224 if (addr
< module_addr_min
|| addr
> module_addr_max
)
4227 module_assert_mutex_or_preempt();
4229 mod
= mod_find(addr
);
4231 BUG_ON(!within_module(addr
, mod
));
4232 if (mod
->state
== MODULE_STATE_UNFORMED
)
4237 EXPORT_SYMBOL_GPL(__module_address
);
4240 * is_module_text_address - is this address inside module code?
4241 * @addr: the address to check.
4243 * See is_module_address() if you simply want to see if the address is
4244 * anywhere in a module. See kernel_text_address() for testing if an
4245 * address corresponds to kernel or module code.
4247 bool is_module_text_address(unsigned long addr
)
4252 ret
= __module_text_address(addr
) != NULL
;
4259 * __module_text_address - get the module whose code contains an address.
4260 * @addr: the address.
4262 * Must be called with preempt disabled or module mutex held so that
4263 * module doesn't get freed during this.
4265 struct module
*__module_text_address(unsigned long addr
)
4267 struct module
*mod
= __module_address(addr
);
4269 /* Make sure it's within the text section. */
4270 if (!within(addr
, mod
->init_layout
.base
, mod
->init_layout
.text_size
)
4271 && !within(addr
, mod
->core_layout
.base
, mod
->core_layout
.text_size
))
4276 EXPORT_SYMBOL_GPL(__module_text_address
);
4278 /* Don't grab lock, we're oopsing. */
4279 void print_modules(void)
4282 char buf
[MODULE_FLAGS_BUF_SIZE
];
4284 printk(KERN_DEFAULT
"Modules linked in:");
4285 /* Most callers should already have preempt disabled, but make sure */
4287 list_for_each_entry_rcu(mod
, &modules
, list
) {
4288 if (mod
->state
== MODULE_STATE_UNFORMED
)
4290 pr_cont(" %s%s", mod
->name
, module_flags(mod
, buf
));
4293 if (last_unloaded_module
[0])
4294 pr_cont(" [last unloaded: %s]", last_unloaded_module
);
4298 #ifdef CONFIG_MODVERSIONS
4299 /* Generate the signature for all relevant module structures here.
4300 * If these change, we don't want to try to parse the module. */
4301 void module_layout(struct module
*mod
,
4302 struct modversion_info
*ver
,
4303 struct kernel_param
*kp
,
4304 struct kernel_symbol
*ks
,
4305 struct tracepoint
* const *tp
)
4308 EXPORT_SYMBOL(module_layout
);