2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 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/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/vmalloc.h>
25 #include <linux/elf.h>
26 #include <linux/seq_file.h>
27 #include <linux/syscalls.h>
28 #include <linux/fcntl.h>
29 #include <linux/rcupdate.h>
30 #include <linux/capability.h>
31 #include <linux/cpu.h>
32 #include <linux/moduleparam.h>
33 #include <linux/errno.h>
34 #include <linux/err.h>
35 #include <linux/vermagic.h>
36 #include <linux/notifier.h>
37 #include <linux/stop_machine.h>
38 #include <linux/device.h>
39 #include <linux/string.h>
40 #include <linux/sched.h>
41 #include <linux/mutex.h>
42 #include <linux/unwind.h>
43 #include <asm/uaccess.h>
44 #include <asm/semaphore.h>
45 #include <asm/cacheflush.h>
46 #include <linux/license.h>
51 #define DEBUGP(fmt , a...)
54 #ifndef ARCH_SHF_SMALL
55 #define ARCH_SHF_SMALL 0
58 /* If this is set, the section belongs in the init part of the module */
59 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
61 /* Protects module list */
62 static DEFINE_SPINLOCK(modlist_lock
);
64 /* List of modules, protected by module_mutex AND modlist_lock */
65 static DEFINE_MUTEX(module_mutex
);
66 static LIST_HEAD(modules
);
68 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
70 int register_module_notifier(struct notifier_block
* nb
)
72 return blocking_notifier_chain_register(&module_notify_list
, nb
);
74 EXPORT_SYMBOL(register_module_notifier
);
76 int unregister_module_notifier(struct notifier_block
* nb
)
78 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
80 EXPORT_SYMBOL(unregister_module_notifier
);
82 /* We require a truly strong try_module_get() */
83 static inline int strong_try_module_get(struct module
*mod
)
85 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
87 return try_module_get(mod
);
90 /* A thread that wants to hold a reference to a module only while it
91 * is running can call ths to safely exit.
92 * nfsd and lockd use this.
94 void __module_put_and_exit(struct module
*mod
, long code
)
99 EXPORT_SYMBOL(__module_put_and_exit
);
101 /* Find a module section: 0 means not found. */
102 static unsigned int find_sec(Elf_Ehdr
*hdr
,
104 const char *secstrings
,
109 for (i
= 1; i
< hdr
->e_shnum
; i
++)
110 /* Alloc bit cleared means "ignore it." */
111 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
112 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
117 /* Provided by the linker */
118 extern const struct kernel_symbol __start___ksymtab
[];
119 extern const struct kernel_symbol __stop___ksymtab
[];
120 extern const struct kernel_symbol __start___ksymtab_gpl
[];
121 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
122 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
123 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
124 extern const struct kernel_symbol __start___ksymtab_unused
[];
125 extern const struct kernel_symbol __stop___ksymtab_unused
[];
126 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
127 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
128 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
129 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
130 extern const unsigned long __start___kcrctab
[];
131 extern const unsigned long __start___kcrctab_gpl
[];
132 extern const unsigned long __start___kcrctab_gpl_future
[];
133 extern const unsigned long __start___kcrctab_unused
[];
134 extern const unsigned long __start___kcrctab_unused_gpl
[];
136 #ifndef CONFIG_MODVERSIONS
137 #define symversion(base, idx) NULL
139 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
142 /* lookup symbol in given range of kernel_symbols */
143 static const struct kernel_symbol
*lookup_symbol(const char *name
,
144 const struct kernel_symbol
*start
,
145 const struct kernel_symbol
*stop
)
147 const struct kernel_symbol
*ks
= start
;
148 for (; ks
< stop
; ks
++)
149 if (strcmp(ks
->name
, name
) == 0)
154 static void printk_unused_warning(const char *name
)
156 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
157 "however this module is using it.\n", name
);
158 printk(KERN_WARNING
"This symbol will go away in the future.\n");
159 printk(KERN_WARNING
"Please evalute if this is the right api to use, "
160 "and if it really is, submit a report the linux kernel "
161 "mailinglist together with submitting your code for "
165 /* Find a symbol, return value, crc and module which owns it */
166 static unsigned long __find_symbol(const char *name
,
167 struct module
**owner
,
168 const unsigned long **crc
,
172 const struct kernel_symbol
*ks
;
174 /* Core kernel first. */
176 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
178 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
182 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
183 __stop___ksymtab_gpl
);
185 *crc
= symversion(__start___kcrctab_gpl
,
186 (ks
- __start___ksymtab_gpl
));
190 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
191 __stop___ksymtab_gpl_future
);
194 printk(KERN_WARNING
"Symbol %s is being used "
195 "by a non-GPL module, which will not "
196 "be allowed in the future\n", name
);
197 printk(KERN_WARNING
"Please see the file "
198 "Documentation/feature-removal-schedule.txt "
199 "in the kernel source tree for more "
202 *crc
= symversion(__start___kcrctab_gpl_future
,
203 (ks
- __start___ksymtab_gpl_future
));
207 ks
= lookup_symbol(name
, __start___ksymtab_unused
,
208 __stop___ksymtab_unused
);
210 printk_unused_warning(name
);
211 *crc
= symversion(__start___kcrctab_unused
,
212 (ks
- __start___ksymtab_unused
));
217 ks
= lookup_symbol(name
, __start___ksymtab_unused_gpl
,
218 __stop___ksymtab_unused_gpl
);
220 printk_unused_warning(name
);
221 *crc
= symversion(__start___kcrctab_unused_gpl
,
222 (ks
- __start___ksymtab_unused_gpl
));
226 /* Now try modules. */
227 list_for_each_entry(mod
, &modules
, list
) {
229 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
231 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
236 ks
= lookup_symbol(name
, mod
->gpl_syms
,
237 mod
->gpl_syms
+ mod
->num_gpl_syms
);
239 *crc
= symversion(mod
->gpl_crcs
,
240 (ks
- mod
->gpl_syms
));
244 ks
= lookup_symbol(name
, mod
->unused_syms
, mod
->unused_syms
+ mod
->num_unused_syms
);
246 printk_unused_warning(name
);
247 *crc
= symversion(mod
->unused_crcs
, (ks
- mod
->unused_syms
));
252 ks
= lookup_symbol(name
, mod
->unused_gpl_syms
,
253 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
);
255 printk_unused_warning(name
);
256 *crc
= symversion(mod
->unused_gpl_crcs
,
257 (ks
- mod
->unused_gpl_syms
));
261 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
262 (mod
->gpl_future_syms
+
263 mod
->num_gpl_future_syms
));
266 printk(KERN_WARNING
"Symbol %s is being used "
267 "by a non-GPL module, which will not "
268 "be allowed in the future\n", name
);
269 printk(KERN_WARNING
"Please see the file "
270 "Documentation/feature-removal-schedule.txt "
271 "in the kernel source tree for more "
274 *crc
= symversion(mod
->gpl_future_crcs
,
275 (ks
- mod
->gpl_future_syms
));
279 DEBUGP("Failed to find symbol %s\n", name
);
283 /* Search for module by name: must hold module_mutex. */
284 static struct module
*find_module(const char *name
)
288 list_for_each_entry(mod
, &modules
, list
) {
289 if (strcmp(mod
->name
, name
) == 0)
296 /* Number of blocks used and allocated. */
297 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
298 /* Size of each block. -ve means used. */
299 static int *pcpu_size
;
301 static int split_block(unsigned int i
, unsigned short size
)
303 /* Reallocation required? */
304 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
305 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
310 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
311 pcpu_num_allocated
*= 2;
316 /* Insert a new subblock */
317 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
318 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
321 pcpu_size
[i
+1] -= size
;
326 static inline unsigned int block_size(int val
)
333 /* Created by linker magic */
334 extern char __per_cpu_start
[], __per_cpu_end
[];
336 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
343 if (align
> SMP_CACHE_BYTES
) {
344 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
345 name
, align
, SMP_CACHE_BYTES
);
346 align
= SMP_CACHE_BYTES
;
349 ptr
= __per_cpu_start
;
350 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
351 /* Extra for alignment requirement. */
352 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
353 BUG_ON(i
== 0 && extra
!= 0);
355 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
358 /* Transfer extra to previous block. */
359 if (pcpu_size
[i
-1] < 0)
360 pcpu_size
[i
-1] -= extra
;
362 pcpu_size
[i
-1] += extra
;
363 pcpu_size
[i
] -= extra
;
366 /* Split block if warranted */
367 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
368 if (!split_block(i
, size
))
372 pcpu_size
[i
] = -pcpu_size
[i
];
376 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
381 static void percpu_modfree(void *freeme
)
384 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
386 /* First entry is core kernel percpu data. */
387 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
389 pcpu_size
[i
] = -pcpu_size
[i
];
396 /* Merge with previous? */
397 if (pcpu_size
[i
-1] >= 0) {
398 pcpu_size
[i
-1] += pcpu_size
[i
];
400 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
401 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
404 /* Merge with next? */
405 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
406 pcpu_size
[i
] += pcpu_size
[i
+1];
408 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
409 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
413 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
415 const char *secstrings
)
417 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
420 static int percpu_modinit(void)
423 pcpu_num_allocated
= 2;
424 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
426 /* Static in-kernel percpu data (used). */
427 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
429 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
430 if (pcpu_size
[1] < 0) {
431 printk(KERN_ERR
"No per-cpu room for modules.\n");
437 __initcall(percpu_modinit
);
438 #else /* ... !CONFIG_SMP */
439 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
444 static inline void percpu_modfree(void *pcpuptr
)
448 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
450 const char *secstrings
)
454 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
457 /* pcpusec should be 0, and size of that section should be 0. */
460 #endif /* CONFIG_SMP */
462 #define MODINFO_ATTR(field) \
463 static void setup_modinfo_##field(struct module *mod, const char *s) \
465 mod->field = kstrdup(s, GFP_KERNEL); \
467 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
468 struct module *mod, char *buffer) \
470 return sprintf(buffer, "%s\n", mod->field); \
472 static int modinfo_##field##_exists(struct module *mod) \
474 return mod->field != NULL; \
476 static void free_modinfo_##field(struct module *mod) \
481 static struct module_attribute modinfo_##field = { \
482 .attr = { .name = __stringify(field), .mode = 0444, \
483 .owner = THIS_MODULE }, \
484 .show = show_modinfo_##field, \
485 .setup = setup_modinfo_##field, \
486 .test = modinfo_##field##_exists, \
487 .free = free_modinfo_##field, \
490 MODINFO_ATTR(version
);
491 MODINFO_ATTR(srcversion
);
493 #ifdef CONFIG_MODULE_UNLOAD
494 /* Init the unload section of the module. */
495 static void module_unload_init(struct module
*mod
)
499 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
500 for (i
= 0; i
< NR_CPUS
; i
++)
501 local_set(&mod
->ref
[i
].count
, 0);
502 /* Hold reference count during initialization. */
503 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
504 /* Backwards compatibility macros put refcount during init. */
505 mod
->waiter
= current
;
508 /* modules using other modules */
511 struct list_head list
;
512 struct module
*module_which_uses
;
515 /* Does a already use b? */
516 static int already_uses(struct module
*a
, struct module
*b
)
518 struct module_use
*use
;
520 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
521 if (use
->module_which_uses
== a
) {
522 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
526 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
530 /* Module a uses b */
531 static int use_module(struct module
*a
, struct module
*b
)
533 struct module_use
*use
;
534 if (b
== NULL
|| already_uses(a
, b
)) return 1;
536 if (!strong_try_module_get(b
))
539 DEBUGP("Allocating new usage for %s.\n", a
->name
);
540 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
542 printk("%s: out of memory loading\n", a
->name
);
547 use
->module_which_uses
= a
;
548 list_add(&use
->list
, &b
->modules_which_use_me
);
552 /* Clear the unload stuff of the module. */
553 static void module_unload_free(struct module
*mod
)
557 list_for_each_entry(i
, &modules
, list
) {
558 struct module_use
*use
;
560 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
561 if (use
->module_which_uses
== mod
) {
562 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
564 list_del(&use
->list
);
566 /* There can be at most one match. */
573 #ifdef CONFIG_MODULE_FORCE_UNLOAD
574 static inline int try_force_unload(unsigned int flags
)
576 int ret
= (flags
& O_TRUNC
);
578 add_taint(TAINT_FORCED_RMMOD
);
582 static inline int try_force_unload(unsigned int flags
)
586 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
595 /* Whole machine is stopped with interrupts off when this runs. */
596 static int __try_stop_module(void *_sref
)
598 struct stopref
*sref
= _sref
;
600 /* If it's not unused, quit unless we are told to block. */
601 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
602 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
606 /* Mark it as dying. */
607 sref
->mod
->state
= MODULE_STATE_GOING
;
611 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
613 struct stopref sref
= { mod
, flags
, forced
};
615 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
618 unsigned int module_refcount(struct module
*mod
)
620 unsigned int i
, total
= 0;
622 for (i
= 0; i
< NR_CPUS
; i
++)
623 total
+= local_read(&mod
->ref
[i
].count
);
626 EXPORT_SYMBOL(module_refcount
);
628 /* This exists whether we can unload or not */
629 static void free_module(struct module
*mod
);
631 static void wait_for_zero_refcount(struct module
*mod
)
633 /* Since we might sleep for some time, drop the semaphore first */
634 mutex_unlock(&module_mutex
);
636 DEBUGP("Looking at refcount...\n");
637 set_current_state(TASK_UNINTERRUPTIBLE
);
638 if (module_refcount(mod
) == 0)
642 current
->state
= TASK_RUNNING
;
643 mutex_lock(&module_mutex
);
647 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
650 char name
[MODULE_NAME_LEN
];
653 if (!capable(CAP_SYS_MODULE
))
656 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
658 name
[MODULE_NAME_LEN
-1] = '\0';
660 if (mutex_lock_interruptible(&module_mutex
) != 0)
663 mod
= find_module(name
);
669 if (!list_empty(&mod
->modules_which_use_me
)) {
670 /* Other modules depend on us: get rid of them first. */
675 /* Doing init or already dying? */
676 if (mod
->state
!= MODULE_STATE_LIVE
) {
677 /* FIXME: if (force), slam module count and wake up
679 DEBUGP("%s already dying\n", mod
->name
);
684 /* If it has an init func, it must have an exit func to unload */
685 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
687 forced
= try_force_unload(flags
);
689 /* This module can't be removed */
695 /* Set this up before setting mod->state */
696 mod
->waiter
= current
;
698 /* Stop the machine so refcounts can't move and disable module. */
699 ret
= try_stop_module(mod
, flags
, &forced
);
703 /* Never wait if forced. */
704 if (!forced
&& module_refcount(mod
) != 0)
705 wait_for_zero_refcount(mod
);
707 /* Final destruction now noone is using it. */
708 if (mod
->exit
!= NULL
) {
709 mutex_unlock(&module_mutex
);
711 mutex_lock(&module_mutex
);
716 mutex_unlock(&module_mutex
);
720 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
722 struct module_use
*use
;
723 int printed_something
= 0;
725 seq_printf(m
, " %u ", module_refcount(mod
));
727 /* Always include a trailing , so userspace can differentiate
728 between this and the old multi-field proc format. */
729 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
730 printed_something
= 1;
731 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
735 printed_something
= 1;
736 seq_printf(m
, "[unsafe],");
739 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
740 printed_something
= 1;
741 seq_printf(m
, "[permanent],");
744 if (!printed_something
)
748 void __symbol_put(const char *symbol
)
750 struct module
*owner
;
752 const unsigned long *crc
;
754 spin_lock_irqsave(&modlist_lock
, flags
);
755 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
758 spin_unlock_irqrestore(&modlist_lock
, flags
);
760 EXPORT_SYMBOL(__symbol_put
);
762 void symbol_put_addr(void *addr
)
764 struct module
*modaddr
;
766 if (core_kernel_text((unsigned long)addr
))
769 if (!(modaddr
= module_text_address((unsigned long)addr
)))
773 EXPORT_SYMBOL_GPL(symbol_put_addr
);
775 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
776 struct module
*mod
, char *buffer
)
778 /* sysfs holds a reference */
779 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
782 static struct module_attribute refcnt
= {
783 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
787 #else /* !CONFIG_MODULE_UNLOAD */
788 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
790 /* We don't know the usage count, or what modules are using. */
791 seq_printf(m
, " - -");
794 static inline void module_unload_free(struct module
*mod
)
798 static inline int use_module(struct module
*a
, struct module
*b
)
800 return strong_try_module_get(b
);
803 static inline void module_unload_init(struct module
*mod
)
806 #endif /* CONFIG_MODULE_UNLOAD */
808 static struct module_attribute
*modinfo_attrs
[] = {
811 #ifdef CONFIG_MODULE_UNLOAD
817 static const char vermagic
[] = VERMAGIC_STRING
;
819 #ifdef CONFIG_MODVERSIONS
820 static int check_version(Elf_Shdr
*sechdrs
,
821 unsigned int versindex
,
824 const unsigned long *crc
)
826 unsigned int i
, num_versions
;
827 struct modversion_info
*versions
;
829 /* Exporting module didn't supply crcs? OK, we're already tainted. */
833 versions
= (void *) sechdrs
[versindex
].sh_addr
;
834 num_versions
= sechdrs
[versindex
].sh_size
835 / sizeof(struct modversion_info
);
837 for (i
= 0; i
< num_versions
; i
++) {
838 if (strcmp(versions
[i
].name
, symname
) != 0)
841 if (versions
[i
].crc
== *crc
)
843 printk("%s: disagrees about version of symbol %s\n",
845 DEBUGP("Found checksum %lX vs module %lX\n",
846 *crc
, versions
[i
].crc
);
849 /* Not in module's version table. OK, but that taints the kernel. */
850 if (!(tainted
& TAINT_FORCED_MODULE
)) {
851 printk("%s: no version for \"%s\" found: kernel tainted.\n",
853 add_taint(TAINT_FORCED_MODULE
);
858 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
859 unsigned int versindex
,
862 const unsigned long *crc
;
863 struct module
*owner
;
865 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
867 return check_version(sechdrs
, versindex
, "struct_module", mod
,
871 /* First part is kernel version, which we ignore. */
872 static inline int same_magic(const char *amagic
, const char *bmagic
)
874 amagic
+= strcspn(amagic
, " ");
875 bmagic
+= strcspn(bmagic
, " ");
876 return strcmp(amagic
, bmagic
) == 0;
879 static inline int check_version(Elf_Shdr
*sechdrs
,
880 unsigned int versindex
,
883 const unsigned long *crc
)
888 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
889 unsigned int versindex
,
895 static inline int same_magic(const char *amagic
, const char *bmagic
)
897 return strcmp(amagic
, bmagic
) == 0;
899 #endif /* CONFIG_MODVERSIONS */
901 /* Resolve a symbol for this module. I.e. if we find one, record usage.
902 Must be holding module_mutex. */
903 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
904 unsigned int versindex
,
908 struct module
*owner
;
910 const unsigned long *crc
;
912 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
914 /* use_module can fail due to OOM, or module unloading */
915 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
916 !use_module(mod
, owner
))
924 * /sys/module/foo/sections stuff
925 * J. Corbet <corbet@lwn.net>
927 #ifdef CONFIG_KALLSYMS
928 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
929 struct module
*mod
, char *buf
)
931 struct module_sect_attr
*sattr
=
932 container_of(mattr
, struct module_sect_attr
, mattr
);
933 return sprintf(buf
, "0x%lx\n", sattr
->address
);
936 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
940 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
941 kfree(sect_attrs
->attrs
[section
].name
);
945 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
946 char *secstrings
, Elf_Shdr
*sechdrs
)
948 unsigned int nloaded
= 0, i
, size
[2];
949 struct module_sect_attrs
*sect_attrs
;
950 struct module_sect_attr
*sattr
;
951 struct attribute
**gattr
;
953 /* Count loaded sections and allocate structures */
954 for (i
= 0; i
< nsect
; i
++)
955 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
957 size
[0] = ALIGN(sizeof(*sect_attrs
)
958 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
959 sizeof(sect_attrs
->grp
.attrs
[0]));
960 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
961 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
962 if (sect_attrs
== NULL
)
965 /* Setup section attributes. */
966 sect_attrs
->grp
.name
= "sections";
967 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
969 sect_attrs
->nsections
= 0;
970 sattr
= §_attrs
->attrs
[0];
971 gattr
= §_attrs
->grp
.attrs
[0];
972 for (i
= 0; i
< nsect
; i
++) {
973 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
975 sattr
->address
= sechdrs
[i
].sh_addr
;
976 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
978 if (sattr
->name
== NULL
)
980 sect_attrs
->nsections
++;
981 sattr
->mattr
.show
= module_sect_show
;
982 sattr
->mattr
.store
= NULL
;
983 sattr
->mattr
.attr
.name
= sattr
->name
;
984 sattr
->mattr
.attr
.owner
= mod
;
985 sattr
->mattr
.attr
.mode
= S_IRUGO
;
986 *(gattr
++) = &(sattr
++)->mattr
.attr
;
990 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
993 mod
->sect_attrs
= sect_attrs
;
996 free_sect_attrs(sect_attrs
);
999 static void remove_sect_attrs(struct module
*mod
)
1001 if (mod
->sect_attrs
) {
1002 sysfs_remove_group(&mod
->mkobj
.kobj
,
1003 &mod
->sect_attrs
->grp
);
1004 /* We are positive that no one is using any sect attrs
1005 * at this point. Deallocate immediately. */
1006 free_sect_attrs(mod
->sect_attrs
);
1007 mod
->sect_attrs
= NULL
;
1013 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1014 char *sectstrings
, Elf_Shdr
*sechdrs
)
1018 static inline void remove_sect_attrs(struct module
*mod
)
1021 #endif /* CONFIG_KALLSYMS */
1023 static int module_add_modinfo_attrs(struct module
*mod
)
1025 struct module_attribute
*attr
;
1026 struct module_attribute
*temp_attr
;
1030 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1031 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1033 if (!mod
->modinfo_attrs
)
1036 temp_attr
= mod
->modinfo_attrs
;
1037 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1039 (attr
->test
&& attr
->test(mod
))) {
1040 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1041 temp_attr
->attr
.owner
= mod
;
1042 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1049 static void module_remove_modinfo_attrs(struct module
*mod
)
1051 struct module_attribute
*attr
;
1054 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1055 /* pick a field to test for end of list */
1056 if (!attr
->attr
.name
)
1058 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1062 kfree(mod
->modinfo_attrs
);
1065 static int mod_sysfs_setup(struct module
*mod
,
1066 struct kernel_param
*kparam
,
1067 unsigned int num_params
)
1071 if (!module_subsys
.kset
.subsys
) {
1072 printk(KERN_ERR
"%s: module_subsys not initialized\n",
1077 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1078 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1081 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1082 mod
->mkobj
.mod
= mod
;
1083 err
= kobject_register(&mod
->mkobj
.kobj
);
1087 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1091 err
= module_add_modinfo_attrs(mod
);
1098 kobject_unregister(&mod
->mkobj
.kobj
);
1103 static void mod_kobject_remove(struct module
*mod
)
1105 module_remove_modinfo_attrs(mod
);
1106 module_param_sysfs_remove(mod
);
1108 kobject_unregister(&mod
->mkobj
.kobj
);
1112 * unlink the module with the whole machine is stopped with interrupts off
1113 * - this defends against kallsyms not taking locks
1115 static int __unlink_module(void *_mod
)
1117 struct module
*mod
= _mod
;
1118 list_del(&mod
->list
);
1122 /* Free a module, remove from lists, etc (must hold module mutex). */
1123 static void free_module(struct module
*mod
)
1125 /* Delete from various lists */
1126 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1127 remove_sect_attrs(mod
);
1128 mod_kobject_remove(mod
);
1130 unwind_remove_table(mod
->unwind_info
, 0);
1132 /* Arch-specific cleanup. */
1133 module_arch_cleanup(mod
);
1135 /* Module unload stuff */
1136 module_unload_free(mod
);
1138 /* This may be NULL, but that's OK */
1139 module_free(mod
, mod
->module_init
);
1142 percpu_modfree(mod
->percpu
);
1144 /* Free lock-classes: */
1145 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1147 /* Finally, free the core (containing the module structure) */
1148 module_free(mod
, mod
->module_core
);
1151 void *__symbol_get(const char *symbol
)
1153 struct module
*owner
;
1154 unsigned long value
, flags
;
1155 const unsigned long *crc
;
1157 spin_lock_irqsave(&modlist_lock
, flags
);
1158 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1159 if (value
&& !strong_try_module_get(owner
))
1161 spin_unlock_irqrestore(&modlist_lock
, flags
);
1163 return (void *)value
;
1165 EXPORT_SYMBOL_GPL(__symbol_get
);
1168 * Ensure that an exported symbol [global namespace] does not already exist
1169 * in the Kernel or in some other modules exported symbol table.
1171 static int verify_export_symbols(struct module
*mod
)
1173 const char *name
= NULL
;
1174 unsigned long i
, ret
= 0;
1175 struct module
*owner
;
1176 const unsigned long *crc
;
1178 for (i
= 0; i
< mod
->num_syms
; i
++)
1179 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1180 name
= mod
->syms
[i
].name
;
1185 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1186 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1187 name
= mod
->gpl_syms
[i
].name
;
1194 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1195 mod
->name
, name
, module_name(owner
));
1200 /* Change all symbols so that sh_value encodes the pointer directly. */
1201 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1202 unsigned int symindex
,
1204 unsigned int versindex
,
1205 unsigned int pcpuindex
,
1208 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1209 unsigned long secbase
;
1210 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1213 for (i
= 1; i
< n
; i
++) {
1214 switch (sym
[i
].st_shndx
) {
1216 /* We compiled with -fno-common. These are not
1217 supposed to happen. */
1218 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1219 printk("%s: please compile with -fno-common\n",
1225 /* Don't need to do anything */
1226 DEBUGP("Absolute symbol: 0x%08lx\n",
1227 (long)sym
[i
].st_value
);
1232 = resolve_symbol(sechdrs
, versindex
,
1233 strtab
+ sym
[i
].st_name
, mod
);
1235 /* Ok if resolved. */
1236 if (sym
[i
].st_value
!= 0)
1239 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1242 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1243 mod
->name
, strtab
+ sym
[i
].st_name
);
1248 /* Divert to percpu allocation if a percpu var. */
1249 if (sym
[i
].st_shndx
== pcpuindex
)
1250 secbase
= (unsigned long)mod
->percpu
;
1252 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1253 sym
[i
].st_value
+= secbase
;
1261 /* Update size with this section: return offset. */
1262 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1266 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1267 *size
= ret
+ sechdr
->sh_size
;
1271 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1272 might -- code, read-only data, read-write data, small data. Tally
1273 sizes, and place the offsets into sh_entsize fields: high bit means it
1275 static void layout_sections(struct module
*mod
,
1276 const Elf_Ehdr
*hdr
,
1278 const char *secstrings
)
1280 static unsigned long const masks
[][2] = {
1281 /* NOTE: all executable code must be the first section
1282 * in this array; otherwise modify the text_size
1283 * finder in the two loops below */
1284 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1285 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1286 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1287 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1291 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1292 sechdrs
[i
].sh_entsize
= ~0UL;
1294 DEBUGP("Core section allocation order:\n");
1295 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1296 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1297 Elf_Shdr
*s
= &sechdrs
[i
];
1299 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1300 || (s
->sh_flags
& masks
[m
][1])
1301 || s
->sh_entsize
!= ~0UL
1302 || strncmp(secstrings
+ s
->sh_name
,
1305 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1306 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1309 mod
->core_text_size
= mod
->core_size
;
1312 DEBUGP("Init section allocation order:\n");
1313 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1314 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1315 Elf_Shdr
*s
= &sechdrs
[i
];
1317 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1318 || (s
->sh_flags
& masks
[m
][1])
1319 || s
->sh_entsize
!= ~0UL
1320 || strncmp(secstrings
+ s
->sh_name
,
1323 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1324 | INIT_OFFSET_MASK
);
1325 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1328 mod
->init_text_size
= mod
->init_size
;
1332 static void set_license(struct module
*mod
, const char *license
)
1335 license
= "unspecified";
1337 mod
->license_gplok
= license_is_gpl_compatible(license
);
1338 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1339 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1340 mod
->name
, license
);
1341 add_taint(TAINT_PROPRIETARY_MODULE
);
1345 /* Parse tag=value strings from .modinfo section */
1346 static char *next_string(char *string
, unsigned long *secsize
)
1348 /* Skip non-zero chars */
1351 if ((*secsize
)-- <= 1)
1355 /* Skip any zero padding. */
1356 while (!string
[0]) {
1358 if ((*secsize
)-- <= 1)
1364 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1369 unsigned int taglen
= strlen(tag
);
1370 unsigned long size
= sechdrs
[info
].sh_size
;
1372 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1373 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1374 return p
+ taglen
+ 1;
1379 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1380 unsigned int infoindex
)
1382 struct module_attribute
*attr
;
1385 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1388 get_modinfo(sechdrs
,
1394 #ifdef CONFIG_KALLSYMS
1395 int is_exported(const char *name
, const struct module
*mod
)
1397 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1400 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1407 static char elf_type(const Elf_Sym
*sym
,
1409 const char *secstrings
,
1412 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1413 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1418 if (sym
->st_shndx
== SHN_UNDEF
)
1420 if (sym
->st_shndx
== SHN_ABS
)
1422 if (sym
->st_shndx
>= SHN_LORESERVE
)
1424 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1426 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1427 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1428 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1430 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1435 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1436 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1441 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1442 ".debug", strlen(".debug")) == 0)
1447 static void add_kallsyms(struct module
*mod
,
1449 unsigned int symindex
,
1450 unsigned int strindex
,
1451 const char *secstrings
)
1455 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1456 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1457 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1459 /* Set types up while we still have access to sections. */
1460 for (i
= 0; i
< mod
->num_symtab
; i
++)
1461 mod
->symtab
[i
].st_info
1462 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1465 static inline void add_kallsyms(struct module
*mod
,
1467 unsigned int symindex
,
1468 unsigned int strindex
,
1469 const char *secstrings
)
1472 #endif /* CONFIG_KALLSYMS */
1474 /* Allocate and load the module: note that size of section 0 is always
1475 zero, and we rely on this for optional sections. */
1476 static struct module
*load_module(void __user
*umod
,
1478 const char __user
*uargs
)
1482 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1484 unsigned int symindex
= 0;
1485 unsigned int strindex
= 0;
1486 unsigned int setupindex
;
1487 unsigned int exindex
;
1488 unsigned int exportindex
;
1489 unsigned int modindex
;
1490 unsigned int obsparmindex
;
1491 unsigned int infoindex
;
1492 unsigned int gplindex
;
1493 unsigned int crcindex
;
1494 unsigned int gplcrcindex
;
1495 unsigned int versindex
;
1496 unsigned int pcpuindex
;
1497 unsigned int gplfutureindex
;
1498 unsigned int gplfuturecrcindex
;
1499 unsigned int unwindex
= 0;
1500 unsigned int unusedindex
;
1501 unsigned int unusedcrcindex
;
1502 unsigned int unusedgplindex
;
1503 unsigned int unusedgplcrcindex
;
1506 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1507 struct exception_table_entry
*extable
;
1508 mm_segment_t old_fs
;
1510 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1512 if (len
< sizeof(*hdr
))
1513 return ERR_PTR(-ENOEXEC
);
1515 /* Suck in entire file: we'll want most of it. */
1516 /* vmalloc barfs on "unusual" numbers. Check here */
1517 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1518 return ERR_PTR(-ENOMEM
);
1519 if (copy_from_user(hdr
, umod
, len
) != 0) {
1524 /* Sanity checks against insmoding binaries or wrong arch,
1525 weird elf version */
1526 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1527 || hdr
->e_type
!= ET_REL
1528 || !elf_check_arch(hdr
)
1529 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1534 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1537 /* Convenience variables */
1538 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1539 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1540 sechdrs
[0].sh_addr
= 0;
1542 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1543 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1544 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1547 /* Mark all sections sh_addr with their address in the
1549 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1551 /* Internal symbols and strings. */
1552 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1554 strindex
= sechdrs
[i
].sh_link
;
1555 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1557 #ifndef CONFIG_MODULE_UNLOAD
1558 /* Don't load .exit sections */
1559 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1560 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1564 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1565 ".gnu.linkonce.this_module");
1567 printk(KERN_WARNING
"No module found in object\n");
1571 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1573 if (symindex
== 0) {
1574 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1580 /* Optional sections */
1581 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1582 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1583 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1584 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1585 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1586 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1587 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1588 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1589 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1590 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1591 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1592 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1593 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1594 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1595 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1596 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1597 #ifdef ARCH_UNWIND_SECTION_NAME
1598 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1601 /* Don't keep modinfo section */
1602 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1603 #ifdef CONFIG_KALLSYMS
1604 /* Keep symbol and string tables for decoding later. */
1605 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1606 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1609 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1611 /* Check module struct version now, before we try to use module. */
1612 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1617 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1618 /* This is allowed: modprobe --force will invalidate it. */
1620 add_taint(TAINT_FORCED_MODULE
);
1621 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1623 } else if (!same_magic(modmagic
, vermagic
)) {
1624 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1625 mod
->name
, modmagic
, vermagic
);
1630 /* Now copy in args */
1631 args
= strndup_user(uargs
, ~0UL >> 1);
1633 err
= PTR_ERR(args
);
1637 if (find_module(mod
->name
)) {
1642 mod
->state
= MODULE_STATE_COMING
;
1644 /* Allow arches to frob section contents and sizes. */
1645 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1650 /* We have a special allocation for this section. */
1651 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1652 sechdrs
[pcpuindex
].sh_addralign
,
1658 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1659 mod
->percpu
= percpu
;
1662 /* Determine total sizes, and put offsets in sh_entsize. For now
1663 this is done generically; there doesn't appear to be any
1664 special cases for the architectures. */
1665 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1667 /* Do the allocs. */
1668 ptr
= module_alloc(mod
->core_size
);
1673 memset(ptr
, 0, mod
->core_size
);
1674 mod
->module_core
= ptr
;
1676 ptr
= module_alloc(mod
->init_size
);
1677 if (!ptr
&& mod
->init_size
) {
1681 memset(ptr
, 0, mod
->init_size
);
1682 mod
->module_init
= ptr
;
1684 /* Transfer each section which specifies SHF_ALLOC */
1685 DEBUGP("final section addresses:\n");
1686 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1689 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1692 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1693 dest
= mod
->module_init
1694 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1696 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1698 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1699 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1700 sechdrs
[i
].sh_size
);
1701 /* Update sh_addr to point to copy in image. */
1702 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1703 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1705 /* Module has been moved. */
1706 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1708 /* Now we've moved module, initialize linked lists, etc. */
1709 module_unload_init(mod
);
1711 /* Set up license info based on the info section */
1712 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1714 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1715 add_taint(TAINT_PROPRIETARY_MODULE
);
1716 if (strcmp(mod
->name
, "driverloader") == 0)
1717 add_taint(TAINT_PROPRIETARY_MODULE
);
1719 /* Set up MODINFO_ATTR fields */
1720 setup_modinfo(mod
, sechdrs
, infoindex
);
1722 /* Fix up syms, so that st_value is a pointer to location. */
1723 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1728 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1729 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1730 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1732 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1733 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1734 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1736 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1737 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1738 sizeof(*mod
->gpl_future_syms
);
1739 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1740 sizeof(*mod
->unused_syms
);
1741 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1742 sizeof(*mod
->unused_gpl_syms
);
1743 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1744 if (gplfuturecrcindex
)
1745 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1747 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1749 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1750 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1751 if (unusedgplcrcindex
)
1752 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
1754 #ifdef CONFIG_MODVERSIONS
1755 if ((mod
->num_syms
&& !crcindex
) ||
1756 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1757 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
1758 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
1759 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
1760 printk(KERN_WARNING
"%s: No versions for exported symbols."
1761 " Tainting kernel.\n", mod
->name
);
1762 add_taint(TAINT_FORCED_MODULE
);
1766 /* Now do relocations. */
1767 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1768 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1769 unsigned int info
= sechdrs
[i
].sh_info
;
1771 /* Not a valid relocation section? */
1772 if (info
>= hdr
->e_shnum
)
1775 /* Don't bother with non-allocated sections */
1776 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1779 if (sechdrs
[i
].sh_type
== SHT_REL
)
1780 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1781 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1782 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1788 /* Find duplicate symbols */
1789 err
= verify_export_symbols(mod
);
1794 /* Set up and sort exception table */
1795 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1796 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1797 sort_extable(extable
, extable
+ mod
->num_exentries
);
1799 /* Finally, copy percpu area over. */
1800 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1801 sechdrs
[pcpuindex
].sh_size
);
1803 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1805 err
= module_finalize(hdr
, sechdrs
, mod
);
1809 /* flush the icache in correct context */
1814 * Flush the instruction cache, since we've played with text.
1815 * Do it before processing of module parameters, so the module
1816 * can provide parameter accessor functions of its own.
1818 if (mod
->module_init
)
1819 flush_icache_range((unsigned long)mod
->module_init
,
1820 (unsigned long)mod
->module_init
1822 flush_icache_range((unsigned long)mod
->module_core
,
1823 (unsigned long)mod
->module_core
+ mod
->core_size
);
1829 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
1832 /* Size of section 0 is 0, so this works well if no params */
1833 err
= parse_args(mod
->name
, mod
->args
,
1834 (struct kernel_param
*)
1835 sechdrs
[setupindex
].sh_addr
,
1836 sechdrs
[setupindex
].sh_size
1837 / sizeof(struct kernel_param
),
1842 err
= mod_sysfs_setup(mod
,
1843 (struct kernel_param
*)
1844 sechdrs
[setupindex
].sh_addr
,
1845 sechdrs
[setupindex
].sh_size
1846 / sizeof(struct kernel_param
));
1849 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1851 /* Size of section 0 is 0, so this works well if no unwind info. */
1852 mod
->unwind_info
= unwind_add_table(mod
,
1853 (void *)sechdrs
[unwindex
].sh_addr
,
1854 sechdrs
[unwindex
].sh_size
);
1856 /* Get rid of temporary copy */
1863 module_arch_cleanup(mod
);
1865 module_unload_free(mod
);
1866 module_free(mod
, mod
->module_init
);
1868 module_free(mod
, mod
->module_core
);
1871 percpu_modfree(percpu
);
1876 return ERR_PTR(err
);
1879 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1885 * link the module with the whole machine is stopped with interrupts off
1886 * - this defends against kallsyms not taking locks
1888 static int __link_module(void *_mod
)
1890 struct module
*mod
= _mod
;
1891 list_add(&mod
->list
, &modules
);
1895 /* This is where the real work happens */
1897 sys_init_module(void __user
*umod
,
1899 const char __user
*uargs
)
1904 /* Must have permission */
1905 if (!capable(CAP_SYS_MODULE
))
1908 /* Only one module load at a time, please */
1909 if (mutex_lock_interruptible(&module_mutex
) != 0)
1912 /* Do all the hard work */
1913 mod
= load_module(umod
, len
, uargs
);
1915 mutex_unlock(&module_mutex
);
1916 return PTR_ERR(mod
);
1919 /* Now sew it into the lists. They won't access us, since
1920 strong_try_module_get() will fail. */
1921 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1923 /* Drop lock so they can recurse */
1924 mutex_unlock(&module_mutex
);
1926 blocking_notifier_call_chain(&module_notify_list
,
1927 MODULE_STATE_COMING
, mod
);
1929 /* Start the module */
1930 if (mod
->init
!= NULL
)
1933 /* Init routine failed: abort. Try to protect us from
1934 buggy refcounters. */
1935 mod
->state
= MODULE_STATE_GOING
;
1936 synchronize_sched();
1938 printk(KERN_ERR
"%s: module is now stuck!\n",
1942 mutex_lock(&module_mutex
);
1944 mutex_unlock(&module_mutex
);
1949 /* Now it's a first class citizen! */
1950 mutex_lock(&module_mutex
);
1951 mod
->state
= MODULE_STATE_LIVE
;
1952 /* Drop initial reference. */
1954 unwind_remove_table(mod
->unwind_info
, 1);
1955 module_free(mod
, mod
->module_init
);
1956 mod
->module_init
= NULL
;
1958 mod
->init_text_size
= 0;
1959 mutex_unlock(&module_mutex
);
1964 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
1966 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
1969 #ifdef CONFIG_KALLSYMS
1971 * This ignores the intensely annoying "mapping symbols" found
1972 * in ARM ELF files: $a, $t and $d.
1974 static inline int is_arm_mapping_symbol(const char *str
)
1976 return str
[0] == '$' && strchr("atd", str
[1])
1977 && (str
[2] == '\0' || str
[2] == '.');
1980 static const char *get_ksymbol(struct module
*mod
,
1982 unsigned long *size
,
1983 unsigned long *offset
)
1985 unsigned int i
, best
= 0;
1986 unsigned long nextval
;
1988 /* At worse, next value is at end of module */
1989 if (within(addr
, mod
->module_init
, mod
->init_size
))
1990 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
1992 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
1994 /* Scan for closest preceeding symbol, and next symbol. (ELF
1995 starts real symbols at 1). */
1996 for (i
= 1; i
< mod
->num_symtab
; i
++) {
1997 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2000 /* We ignore unnamed symbols: they're uninformative
2001 * and inserted at a whim. */
2002 if (mod
->symtab
[i
].st_value
<= addr
2003 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2004 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2005 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2007 if (mod
->symtab
[i
].st_value
> addr
2008 && mod
->symtab
[i
].st_value
< nextval
2009 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2010 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2011 nextval
= mod
->symtab
[i
].st_value
;
2017 *size
= nextval
- mod
->symtab
[best
].st_value
;
2018 *offset
= addr
- mod
->symtab
[best
].st_value
;
2019 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2022 /* For kallsyms to ask for address resolution. NULL means not found.
2023 We don't lock, as this is used for oops resolution and races are a
2025 const char *module_address_lookup(unsigned long addr
,
2026 unsigned long *size
,
2027 unsigned long *offset
,
2032 list_for_each_entry(mod
, &modules
, list
) {
2033 if (within(addr
, mod
->module_init
, mod
->init_size
)
2034 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2035 *modname
= mod
->name
;
2036 return get_ksymbol(mod
, addr
, size
, offset
);
2042 struct module
*module_get_kallsym(unsigned int symnum
, unsigned long *value
,
2043 char *type
, char *name
, size_t namelen
)
2047 mutex_lock(&module_mutex
);
2048 list_for_each_entry(mod
, &modules
, list
) {
2049 if (symnum
< mod
->num_symtab
) {
2050 *value
= mod
->symtab
[symnum
].st_value
;
2051 *type
= mod
->symtab
[symnum
].st_info
;
2052 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2054 mutex_unlock(&module_mutex
);
2057 symnum
-= mod
->num_symtab
;
2059 mutex_unlock(&module_mutex
);
2063 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2067 for (i
= 0; i
< mod
->num_symtab
; i
++)
2068 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2069 mod
->symtab
[i
].st_info
!= 'U')
2070 return mod
->symtab
[i
].st_value
;
2074 /* Look for this name: can be of form module:name. */
2075 unsigned long module_kallsyms_lookup_name(const char *name
)
2079 unsigned long ret
= 0;
2081 /* Don't lock: we're in enough trouble already. */
2082 if ((colon
= strchr(name
, ':')) != NULL
) {
2084 if ((mod
= find_module(name
)) != NULL
)
2085 ret
= mod_find_symname(mod
, colon
+1);
2088 list_for_each_entry(mod
, &modules
, list
)
2089 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2094 #endif /* CONFIG_KALLSYMS */
2096 /* Called by the /proc file system to return a list of modules. */
2097 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2099 struct list_head
*i
;
2102 mutex_lock(&module_mutex
);
2103 list_for_each(i
, &modules
) {
2112 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2114 struct list_head
*i
= p
;
2116 if (i
->next
== &modules
)
2121 static void m_stop(struct seq_file
*m
, void *p
)
2123 mutex_unlock(&module_mutex
);
2126 static int m_show(struct seq_file
*m
, void *p
)
2128 struct module
*mod
= list_entry(p
, struct module
, list
);
2129 seq_printf(m
, "%s %lu",
2130 mod
->name
, mod
->init_size
+ mod
->core_size
);
2131 print_unload_info(m
, mod
);
2133 /* Informative for users. */
2134 seq_printf(m
, " %s",
2135 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2136 mod
->state
== MODULE_STATE_COMING
? "Loading":
2138 /* Used by oprofile and other similar tools. */
2139 seq_printf(m
, " 0x%p", mod
->module_core
);
2141 seq_printf(m
, "\n");
2145 /* Format: modulename size refcount deps address
2147 Where refcount is a number or -, and deps is a comma-separated list
2150 struct seq_operations modules_op
= {
2157 /* Given an address, look for it in the module exception tables. */
2158 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2160 unsigned long flags
;
2161 const struct exception_table_entry
*e
= NULL
;
2164 spin_lock_irqsave(&modlist_lock
, flags
);
2165 list_for_each_entry(mod
, &modules
, list
) {
2166 if (mod
->num_exentries
== 0)
2169 e
= search_extable(mod
->extable
,
2170 mod
->extable
+ mod
->num_exentries
- 1,
2175 spin_unlock_irqrestore(&modlist_lock
, flags
);
2177 /* Now, if we found one, we are running inside it now, hence
2178 we cannot unload the module, hence no refcnt needed. */
2183 * Is this a valid module address?
2185 int is_module_address(unsigned long addr
)
2187 unsigned long flags
;
2190 spin_lock_irqsave(&modlist_lock
, flags
);
2192 list_for_each_entry(mod
, &modules
, list
) {
2193 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2194 spin_unlock_irqrestore(&modlist_lock
, flags
);
2199 spin_unlock_irqrestore(&modlist_lock
, flags
);
2205 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2206 struct module
*__module_text_address(unsigned long addr
)
2210 list_for_each_entry(mod
, &modules
, list
)
2211 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2212 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2217 struct module
*module_text_address(unsigned long addr
)
2220 unsigned long flags
;
2222 spin_lock_irqsave(&modlist_lock
, flags
);
2223 mod
= __module_text_address(addr
);
2224 spin_unlock_irqrestore(&modlist_lock
, flags
);
2229 /* Don't grab lock, we're oopsing. */
2230 void print_modules(void)
2234 printk("Modules linked in:");
2235 list_for_each_entry(mod
, &modules
, list
)
2236 printk(" %s", mod
->name
);
2240 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2245 /* Don't check return code; this call is idempotent */
2246 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2248 EXPORT_SYMBOL(module_add_driver
);
2250 void module_remove_driver(struct device_driver
*drv
)
2254 sysfs_remove_link(&drv
->kobj
, "module");
2256 EXPORT_SYMBOL(module_remove_driver
);
2258 #ifdef CONFIG_MODVERSIONS
2259 /* Generate the signature for struct module here, too, for modversions. */
2260 void struct_module(struct module
*mod
) { return; }
2261 EXPORT_SYMBOL(struct_module
);