1 /* Rewritten by Rusty Russell, on the backs of many others...
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/config.h>
20 #include <linux/module.h>
21 #include <linux/moduleloader.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
26 #include <linux/elf.h>
27 #include <linux/seq_file.h>
28 #include <linux/syscalls.h>
29 #include <linux/fcntl.h>
30 #include <linux/rcupdate.h>
31 #include <linux/capability.h>
32 #include <linux/cpu.h>
33 #include <linux/moduleparam.h>
34 #include <linux/errno.h>
35 #include <linux/err.h>
36 #include <linux/vermagic.h>
37 #include <linux/notifier.h>
38 #include <linux/stop_machine.h>
39 #include <linux/device.h>
40 #include <linux/string.h>
41 #include <linux/sched.h>
42 #include <linux/mutex.h>
43 #include <asm/uaccess.h>
44 #include <asm/semaphore.h>
45 #include <asm/cacheflush.h>
50 #define DEBUGP(fmt , a...)
53 #ifndef ARCH_SHF_SMALL
54 #define ARCH_SHF_SMALL 0
57 /* If this is set, the section belongs in the init part of the module */
58 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
60 /* Protects module list */
61 static DEFINE_SPINLOCK(modlist_lock
);
63 /* List of modules, protected by module_mutex AND modlist_lock */
64 static DEFINE_MUTEX(module_mutex
);
65 static LIST_HEAD(modules
);
67 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
69 int register_module_notifier(struct notifier_block
* nb
)
71 return blocking_notifier_chain_register(&module_notify_list
, nb
);
73 EXPORT_SYMBOL(register_module_notifier
);
75 int unregister_module_notifier(struct notifier_block
* nb
)
77 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
79 EXPORT_SYMBOL(unregister_module_notifier
);
81 /* We require a truly strong try_module_get() */
82 static inline int strong_try_module_get(struct module
*mod
)
84 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
86 return try_module_get(mod
);
89 /* A thread that wants to hold a reference to a module only while it
90 * is running can call ths to safely exit.
91 * nfsd and lockd use this.
93 void __module_put_and_exit(struct module
*mod
, long code
)
98 EXPORT_SYMBOL(__module_put_and_exit
);
100 /* Find a module section: 0 means not found. */
101 static unsigned int find_sec(Elf_Ehdr
*hdr
,
103 const char *secstrings
,
108 for (i
= 1; i
< hdr
->e_shnum
; i
++)
109 /* Alloc bit cleared means "ignore it." */
110 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
111 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
116 /* Provided by the linker */
117 extern const struct kernel_symbol __start___ksymtab
[];
118 extern const struct kernel_symbol __stop___ksymtab
[];
119 extern const struct kernel_symbol __start___ksymtab_gpl
[];
120 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
121 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
122 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
123 extern const unsigned long __start___kcrctab
[];
124 extern const unsigned long __start___kcrctab_gpl
[];
125 extern const unsigned long __start___kcrctab_gpl_future
[];
127 #ifndef CONFIG_MODVERSIONS
128 #define symversion(base, idx) NULL
130 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
133 /* lookup symbol in given range of kernel_symbols */
134 static const struct kernel_symbol
*lookup_symbol(const char *name
,
135 const struct kernel_symbol
*start
,
136 const struct kernel_symbol
*stop
)
138 const struct kernel_symbol
*ks
= start
;
139 for (; ks
< stop
; ks
++)
140 if (strcmp(ks
->name
, name
) == 0)
145 /* Find a symbol, return value, crc and module which owns it */
146 static unsigned long __find_symbol(const char *name
,
147 struct module
**owner
,
148 const unsigned long **crc
,
152 const struct kernel_symbol
*ks
;
154 /* Core kernel first. */
156 ks
= lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
);
158 *crc
= symversion(__start___kcrctab
, (ks
- __start___ksymtab
));
162 ks
= lookup_symbol(name
, __start___ksymtab_gpl
,
163 __stop___ksymtab_gpl
);
165 *crc
= symversion(__start___kcrctab_gpl
,
166 (ks
- __start___ksymtab_gpl
));
170 ks
= lookup_symbol(name
, __start___ksymtab_gpl_future
,
171 __stop___ksymtab_gpl_future
);
174 printk(KERN_WARNING
"Symbol %s is being used "
175 "by a non-GPL module, which will not "
176 "be allowed in the future\n", name
);
177 printk(KERN_WARNING
"Please see the file "
178 "Documentation/feature-removal-schedule.txt "
179 "in the kernel source tree for more "
182 *crc
= symversion(__start___kcrctab_gpl_future
,
183 (ks
- __start___ksymtab_gpl_future
));
187 /* Now try modules. */
188 list_for_each_entry(mod
, &modules
, list
) {
190 ks
= lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
);
192 *crc
= symversion(mod
->crcs
, (ks
- mod
->syms
));
197 ks
= lookup_symbol(name
, mod
->gpl_syms
,
198 mod
->gpl_syms
+ mod
->num_gpl_syms
);
200 *crc
= symversion(mod
->gpl_crcs
,
201 (ks
- mod
->gpl_syms
));
205 ks
= lookup_symbol(name
, mod
->gpl_future_syms
,
206 (mod
->gpl_future_syms
+
207 mod
->num_gpl_future_syms
));
210 printk(KERN_WARNING
"Symbol %s is being used "
211 "by a non-GPL module, which will not "
212 "be allowed in the future\n", name
);
213 printk(KERN_WARNING
"Please see the file "
214 "Documentation/feature-removal-schedule.txt "
215 "in the kernel source tree for more "
218 *crc
= symversion(mod
->gpl_future_crcs
,
219 (ks
- mod
->gpl_future_syms
));
223 DEBUGP("Failed to find symbol %s\n", name
);
227 /* Search for module by name: must hold module_mutex. */
228 static struct module
*find_module(const char *name
)
232 list_for_each_entry(mod
, &modules
, list
) {
233 if (strcmp(mod
->name
, name
) == 0)
240 /* Number of blocks used and allocated. */
241 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
242 /* Size of each block. -ve means used. */
243 static int *pcpu_size
;
245 static int split_block(unsigned int i
, unsigned short size
)
247 /* Reallocation required? */
248 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
249 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated
*2,
254 memcpy(new, pcpu_size
, sizeof(new[0])*pcpu_num_allocated
);
255 pcpu_num_allocated
*= 2;
260 /* Insert a new subblock */
261 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
262 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
265 pcpu_size
[i
+1] -= size
;
270 static inline unsigned int block_size(int val
)
277 /* Created by linker magic */
278 extern char __per_cpu_start
[], __per_cpu_end
[];
280 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
287 if (align
> SMP_CACHE_BYTES
) {
288 printk(KERN_WARNING
"%s: per-cpu alignment %li > %i\n",
289 name
, align
, SMP_CACHE_BYTES
);
290 align
= SMP_CACHE_BYTES
;
293 ptr
= __per_cpu_start
;
294 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
295 /* Extra for alignment requirement. */
296 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
297 BUG_ON(i
== 0 && extra
!= 0);
299 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
302 /* Transfer extra to previous block. */
303 if (pcpu_size
[i
-1] < 0)
304 pcpu_size
[i
-1] -= extra
;
306 pcpu_size
[i
-1] += extra
;
307 pcpu_size
[i
] -= extra
;
310 /* Split block if warranted */
311 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
312 if (!split_block(i
, size
))
316 pcpu_size
[i
] = -pcpu_size
[i
];
320 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
325 static void percpu_modfree(void *freeme
)
328 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
330 /* First entry is core kernel percpu data. */
331 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
333 pcpu_size
[i
] = -pcpu_size
[i
];
340 /* Merge with previous? */
341 if (pcpu_size
[i
-1] >= 0) {
342 pcpu_size
[i
-1] += pcpu_size
[i
];
344 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
345 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
348 /* Merge with next? */
349 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
350 pcpu_size
[i
] += pcpu_size
[i
+1];
352 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
353 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
357 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
359 const char *secstrings
)
361 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
364 static int percpu_modinit(void)
367 pcpu_num_allocated
= 2;
368 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
370 /* Static in-kernel percpu data (used). */
371 pcpu_size
[0] = -ALIGN(__per_cpu_end
-__per_cpu_start
, SMP_CACHE_BYTES
);
373 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
374 if (pcpu_size
[1] < 0) {
375 printk(KERN_ERR
"No per-cpu room for modules.\n");
381 __initcall(percpu_modinit
);
382 #else /* ... !CONFIG_SMP */
383 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
388 static inline void percpu_modfree(void *pcpuptr
)
392 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
394 const char *secstrings
)
398 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
401 /* pcpusec should be 0, and size of that section should be 0. */
404 #endif /* CONFIG_SMP */
406 #define MODINFO_ATTR(field) \
407 static void setup_modinfo_##field(struct module *mod, const char *s) \
409 mod->field = kstrdup(s, GFP_KERNEL); \
411 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
412 struct module *mod, char *buffer) \
414 return sprintf(buffer, "%s\n", mod->field); \
416 static int modinfo_##field##_exists(struct module *mod) \
418 return mod->field != NULL; \
420 static void free_modinfo_##field(struct module *mod) \
425 static struct module_attribute modinfo_##field = { \
426 .attr = { .name = __stringify(field), .mode = 0444, \
427 .owner = THIS_MODULE }, \
428 .show = show_modinfo_##field, \
429 .setup = setup_modinfo_##field, \
430 .test = modinfo_##field##_exists, \
431 .free = free_modinfo_##field, \
434 MODINFO_ATTR(version
);
435 MODINFO_ATTR(srcversion
);
437 #ifdef CONFIG_MODULE_UNLOAD
438 /* Init the unload section of the module. */
439 static void module_unload_init(struct module
*mod
)
443 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
444 for (i
= 0; i
< NR_CPUS
; i
++)
445 local_set(&mod
->ref
[i
].count
, 0);
446 /* Hold reference count during initialization. */
447 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
448 /* Backwards compatibility macros put refcount during init. */
449 mod
->waiter
= current
;
452 /* modules using other modules */
455 struct list_head list
;
456 struct module
*module_which_uses
;
459 /* Does a already use b? */
460 static int already_uses(struct module
*a
, struct module
*b
)
462 struct module_use
*use
;
464 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
465 if (use
->module_which_uses
== a
) {
466 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
470 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
474 /* Module a uses b */
475 static int use_module(struct module
*a
, struct module
*b
)
477 struct module_use
*use
;
478 if (b
== NULL
|| already_uses(a
, b
)) return 1;
480 if (!strong_try_module_get(b
))
483 DEBUGP("Allocating new usage for %s.\n", a
->name
);
484 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
486 printk("%s: out of memory loading\n", a
->name
);
491 use
->module_which_uses
= a
;
492 list_add(&use
->list
, &b
->modules_which_use_me
);
496 /* Clear the unload stuff of the module. */
497 static void module_unload_free(struct module
*mod
)
501 list_for_each_entry(i
, &modules
, list
) {
502 struct module_use
*use
;
504 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
505 if (use
->module_which_uses
== mod
) {
506 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
508 list_del(&use
->list
);
510 /* There can be at most one match. */
517 #ifdef CONFIG_MODULE_FORCE_UNLOAD
518 static inline int try_force_unload(unsigned int flags
)
520 int ret
= (flags
& O_TRUNC
);
522 add_taint(TAINT_FORCED_RMMOD
);
526 static inline int try_force_unload(unsigned int flags
)
530 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
539 /* Whole machine is stopped with interrupts off when this runs. */
540 static int __try_stop_module(void *_sref
)
542 struct stopref
*sref
= _sref
;
544 /* If it's not unused, quit unless we are told to block. */
545 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
546 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
550 /* Mark it as dying. */
551 sref
->mod
->state
= MODULE_STATE_GOING
;
555 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
557 struct stopref sref
= { mod
, flags
, forced
};
559 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
562 unsigned int module_refcount(struct module
*mod
)
564 unsigned int i
, total
= 0;
566 for (i
= 0; i
< NR_CPUS
; i
++)
567 total
+= local_read(&mod
->ref
[i
].count
);
570 EXPORT_SYMBOL(module_refcount
);
572 /* This exists whether we can unload or not */
573 static void free_module(struct module
*mod
);
575 static void wait_for_zero_refcount(struct module
*mod
)
577 /* Since we might sleep for some time, drop the semaphore first */
578 mutex_unlock(&module_mutex
);
580 DEBUGP("Looking at refcount...\n");
581 set_current_state(TASK_UNINTERRUPTIBLE
);
582 if (module_refcount(mod
) == 0)
586 current
->state
= TASK_RUNNING
;
587 mutex_lock(&module_mutex
);
591 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
594 char name
[MODULE_NAME_LEN
];
597 if (!capable(CAP_SYS_MODULE
))
600 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
602 name
[MODULE_NAME_LEN
-1] = '\0';
604 if (mutex_lock_interruptible(&module_mutex
) != 0)
607 mod
= find_module(name
);
613 if (!list_empty(&mod
->modules_which_use_me
)) {
614 /* Other modules depend on us: get rid of them first. */
619 /* Doing init or already dying? */
620 if (mod
->state
!= MODULE_STATE_LIVE
) {
621 /* FIXME: if (force), slam module count and wake up
623 DEBUGP("%s already dying\n", mod
->name
);
628 /* If it has an init func, it must have an exit func to unload */
629 if ((mod
->init
!= NULL
&& mod
->exit
== NULL
)
631 forced
= try_force_unload(flags
);
633 /* This module can't be removed */
639 /* Set this up before setting mod->state */
640 mod
->waiter
= current
;
642 /* Stop the machine so refcounts can't move and disable module. */
643 ret
= try_stop_module(mod
, flags
, &forced
);
647 /* Never wait if forced. */
648 if (!forced
&& module_refcount(mod
) != 0)
649 wait_for_zero_refcount(mod
);
651 /* Final destruction now noone is using it. */
652 if (mod
->exit
!= NULL
) {
653 mutex_unlock(&module_mutex
);
655 mutex_lock(&module_mutex
);
660 mutex_unlock(&module_mutex
);
664 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
666 struct module_use
*use
;
667 int printed_something
= 0;
669 seq_printf(m
, " %u ", module_refcount(mod
));
671 /* Always include a trailing , so userspace can differentiate
672 between this and the old multi-field proc format. */
673 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
674 printed_something
= 1;
675 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
679 printed_something
= 1;
680 seq_printf(m
, "[unsafe],");
683 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
684 printed_something
= 1;
685 seq_printf(m
, "[permanent],");
688 if (!printed_something
)
692 void __symbol_put(const char *symbol
)
694 struct module
*owner
;
696 const unsigned long *crc
;
698 spin_lock_irqsave(&modlist_lock
, flags
);
699 if (!__find_symbol(symbol
, &owner
, &crc
, 1))
702 spin_unlock_irqrestore(&modlist_lock
, flags
);
704 EXPORT_SYMBOL(__symbol_put
);
706 void symbol_put_addr(void *addr
)
710 spin_lock_irqsave(&modlist_lock
, flags
);
711 if (!kernel_text_address((unsigned long)addr
))
714 module_put(module_text_address((unsigned long)addr
));
715 spin_unlock_irqrestore(&modlist_lock
, flags
);
717 EXPORT_SYMBOL_GPL(symbol_put_addr
);
719 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
720 struct module
*mod
, char *buffer
)
722 /* sysfs holds a reference */
723 return sprintf(buffer
, "%u\n", module_refcount(mod
)-1);
726 static struct module_attribute refcnt
= {
727 .attr
= { .name
= "refcnt", .mode
= 0444, .owner
= THIS_MODULE
},
731 #else /* !CONFIG_MODULE_UNLOAD */
732 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
734 /* We don't know the usage count, or what modules are using. */
735 seq_printf(m
, " - -");
738 static inline void module_unload_free(struct module
*mod
)
742 static inline int use_module(struct module
*a
, struct module
*b
)
744 return strong_try_module_get(b
);
747 static inline void module_unload_init(struct module
*mod
)
750 #endif /* CONFIG_MODULE_UNLOAD */
752 static struct module_attribute
*modinfo_attrs
[] = {
755 #ifdef CONFIG_MODULE_UNLOAD
761 static const char vermagic
[] = VERMAGIC_STRING
;
763 #ifdef CONFIG_MODVERSIONS
764 static int check_version(Elf_Shdr
*sechdrs
,
765 unsigned int versindex
,
768 const unsigned long *crc
)
770 unsigned int i
, num_versions
;
771 struct modversion_info
*versions
;
773 /* Exporting module didn't supply crcs? OK, we're already tainted. */
777 versions
= (void *) sechdrs
[versindex
].sh_addr
;
778 num_versions
= sechdrs
[versindex
].sh_size
779 / sizeof(struct modversion_info
);
781 for (i
= 0; i
< num_versions
; i
++) {
782 if (strcmp(versions
[i
].name
, symname
) != 0)
785 if (versions
[i
].crc
== *crc
)
787 printk("%s: disagrees about version of symbol %s\n",
789 DEBUGP("Found checksum %lX vs module %lX\n",
790 *crc
, versions
[i
].crc
);
793 /* Not in module's version table. OK, but that taints the kernel. */
794 if (!(tainted
& TAINT_FORCED_MODULE
)) {
795 printk("%s: no version for \"%s\" found: kernel tainted.\n",
797 add_taint(TAINT_FORCED_MODULE
);
802 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
803 unsigned int versindex
,
806 const unsigned long *crc
;
807 struct module
*owner
;
809 if (!__find_symbol("struct_module", &owner
, &crc
, 1))
811 return check_version(sechdrs
, versindex
, "struct_module", mod
,
815 /* First part is kernel version, which we ignore. */
816 static inline int same_magic(const char *amagic
, const char *bmagic
)
818 amagic
+= strcspn(amagic
, " ");
819 bmagic
+= strcspn(bmagic
, " ");
820 return strcmp(amagic
, bmagic
) == 0;
823 static inline int check_version(Elf_Shdr
*sechdrs
,
824 unsigned int versindex
,
827 const unsigned long *crc
)
832 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
833 unsigned int versindex
,
839 static inline int same_magic(const char *amagic
, const char *bmagic
)
841 return strcmp(amagic
, bmagic
) == 0;
843 #endif /* CONFIG_MODVERSIONS */
845 /* Resolve a symbol for this module. I.e. if we find one, record usage.
846 Must be holding module_mutex. */
847 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
848 unsigned int versindex
,
852 struct module
*owner
;
854 const unsigned long *crc
;
856 ret
= __find_symbol(name
, &owner
, &crc
, mod
->license_gplok
);
858 /* use_module can fail due to OOM, or module unloading */
859 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
860 !use_module(mod
, owner
))
868 * /sys/module/foo/sections stuff
869 * J. Corbet <corbet@lwn.net>
871 #ifdef CONFIG_KALLSYMS
872 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
873 struct module
*mod
, char *buf
)
875 struct module_sect_attr
*sattr
=
876 container_of(mattr
, struct module_sect_attr
, mattr
);
877 return sprintf(buf
, "0x%lx\n", sattr
->address
);
880 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
881 char *secstrings
, Elf_Shdr
*sechdrs
)
883 unsigned int nloaded
= 0, i
, size
[2];
884 struct module_sect_attrs
*sect_attrs
;
885 struct module_sect_attr
*sattr
;
886 struct attribute
**gattr
;
888 /* Count loaded sections and allocate structures */
889 for (i
= 0; i
< nsect
; i
++)
890 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
892 size
[0] = ALIGN(sizeof(*sect_attrs
)
893 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
894 sizeof(sect_attrs
->grp
.attrs
[0]));
895 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
896 if (! (sect_attrs
= kmalloc(size
[0] + size
[1], GFP_KERNEL
)))
899 /* Setup section attributes. */
900 sect_attrs
->grp
.name
= "sections";
901 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
903 sattr
= §_attrs
->attrs
[0];
904 gattr
= §_attrs
->grp
.attrs
[0];
905 for (i
= 0; i
< nsect
; i
++) {
906 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
908 sattr
->address
= sechdrs
[i
].sh_addr
;
909 strlcpy(sattr
->name
, secstrings
+ sechdrs
[i
].sh_name
,
910 MODULE_SECT_NAME_LEN
);
911 sattr
->mattr
.show
= module_sect_show
;
912 sattr
->mattr
.store
= NULL
;
913 sattr
->mattr
.attr
.name
= sattr
->name
;
914 sattr
->mattr
.attr
.owner
= mod
;
915 sattr
->mattr
.attr
.mode
= S_IRUGO
;
916 *(gattr
++) = &(sattr
++)->mattr
.attr
;
920 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
923 mod
->sect_attrs
= sect_attrs
;
929 static void remove_sect_attrs(struct module
*mod
)
931 if (mod
->sect_attrs
) {
932 sysfs_remove_group(&mod
->mkobj
.kobj
,
933 &mod
->sect_attrs
->grp
);
934 /* We are positive that no one is using any sect attrs
935 * at this point. Deallocate immediately. */
936 kfree(mod
->sect_attrs
);
937 mod
->sect_attrs
= NULL
;
943 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
944 char *sectstrings
, Elf_Shdr
*sechdrs
)
948 static inline void remove_sect_attrs(struct module
*mod
)
951 #endif /* CONFIG_KALLSYMS */
953 static int module_add_modinfo_attrs(struct module
*mod
)
955 struct module_attribute
*attr
;
956 struct module_attribute
*temp_attr
;
960 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
961 (ARRAY_SIZE(modinfo_attrs
) + 1)),
963 if (!mod
->modinfo_attrs
)
966 temp_attr
= mod
->modinfo_attrs
;
967 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
969 (attr
->test
&& attr
->test(mod
))) {
970 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
971 temp_attr
->attr
.owner
= mod
;
972 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
979 static void module_remove_modinfo_attrs(struct module
*mod
)
981 struct module_attribute
*attr
;
984 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
985 /* pick a field to test for end of list */
986 if (!attr
->attr
.name
)
988 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
992 kfree(mod
->modinfo_attrs
);
995 static int mod_sysfs_setup(struct module
*mod
,
996 struct kernel_param
*kparam
,
997 unsigned int num_params
)
1001 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1002 err
= kobject_set_name(&mod
->mkobj
.kobj
, "%s", mod
->name
);
1005 kobj_set_kset_s(&mod
->mkobj
, module_subsys
);
1006 mod
->mkobj
.mod
= mod
;
1007 err
= kobject_register(&mod
->mkobj
.kobj
);
1011 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1015 err
= module_add_modinfo_attrs(mod
);
1022 kobject_unregister(&mod
->mkobj
.kobj
);
1027 static void mod_kobject_remove(struct module
*mod
)
1029 module_remove_modinfo_attrs(mod
);
1030 module_param_sysfs_remove(mod
);
1032 kobject_unregister(&mod
->mkobj
.kobj
);
1036 * unlink the module with the whole machine is stopped with interrupts off
1037 * - this defends against kallsyms not taking locks
1039 static int __unlink_module(void *_mod
)
1041 struct module
*mod
= _mod
;
1042 list_del(&mod
->list
);
1046 /* Free a module, remove from lists, etc (must hold module mutex). */
1047 static void free_module(struct module
*mod
)
1049 /* Delete from various lists */
1050 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1051 remove_sect_attrs(mod
);
1052 mod_kobject_remove(mod
);
1054 /* Arch-specific cleanup. */
1055 module_arch_cleanup(mod
);
1057 /* Module unload stuff */
1058 module_unload_free(mod
);
1060 /* This may be NULL, but that's OK */
1061 module_free(mod
, mod
->module_init
);
1064 percpu_modfree(mod
->percpu
);
1066 /* Finally, free the core (containing the module structure) */
1067 module_free(mod
, mod
->module_core
);
1070 void *__symbol_get(const char *symbol
)
1072 struct module
*owner
;
1073 unsigned long value
, flags
;
1074 const unsigned long *crc
;
1076 spin_lock_irqsave(&modlist_lock
, flags
);
1077 value
= __find_symbol(symbol
, &owner
, &crc
, 1);
1078 if (value
&& !strong_try_module_get(owner
))
1080 spin_unlock_irqrestore(&modlist_lock
, flags
);
1082 return (void *)value
;
1084 EXPORT_SYMBOL_GPL(__symbol_get
);
1087 * Ensure that an exported symbol [global namespace] does not already exist
1088 * in the Kernel or in some other modules exported symbol table.
1090 static int verify_export_symbols(struct module
*mod
)
1092 const char *name
= NULL
;
1093 unsigned long i
, ret
= 0;
1094 struct module
*owner
;
1095 const unsigned long *crc
;
1097 for (i
= 0; i
< mod
->num_syms
; i
++)
1098 if (__find_symbol(mod
->syms
[i
].name
, &owner
, &crc
, 1)) {
1099 name
= mod
->syms
[i
].name
;
1104 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1105 if (__find_symbol(mod
->gpl_syms
[i
].name
, &owner
, &crc
, 1)) {
1106 name
= mod
->gpl_syms
[i
].name
;
1113 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1114 mod
->name
, name
, module_name(owner
));
1119 /* Change all symbols so that sh_value encodes the pointer directly. */
1120 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1121 unsigned int symindex
,
1123 unsigned int versindex
,
1124 unsigned int pcpuindex
,
1127 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1128 unsigned long secbase
;
1129 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1132 for (i
= 1; i
< n
; i
++) {
1133 switch (sym
[i
].st_shndx
) {
1135 /* We compiled with -fno-common. These are not
1136 supposed to happen. */
1137 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1138 printk("%s: please compile with -fno-common\n",
1144 /* Don't need to do anything */
1145 DEBUGP("Absolute symbol: 0x%08lx\n",
1146 (long)sym
[i
].st_value
);
1151 = resolve_symbol(sechdrs
, versindex
,
1152 strtab
+ sym
[i
].st_name
, mod
);
1154 /* Ok if resolved. */
1155 if (sym
[i
].st_value
!= 0)
1158 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1161 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1162 mod
->name
, strtab
+ sym
[i
].st_name
);
1167 /* Divert to percpu allocation if a percpu var. */
1168 if (sym
[i
].st_shndx
== pcpuindex
)
1169 secbase
= (unsigned long)mod
->percpu
;
1171 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1172 sym
[i
].st_value
+= secbase
;
1180 /* Update size with this section: return offset. */
1181 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1185 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1186 *size
= ret
+ sechdr
->sh_size
;
1190 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1191 might -- code, read-only data, read-write data, small data. Tally
1192 sizes, and place the offsets into sh_entsize fields: high bit means it
1194 static void layout_sections(struct module
*mod
,
1195 const Elf_Ehdr
*hdr
,
1197 const char *secstrings
)
1199 static unsigned long const masks
[][2] = {
1200 /* NOTE: all executable code must be the first section
1201 * in this array; otherwise modify the text_size
1202 * finder in the two loops below */
1203 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1204 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1205 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1206 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1210 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1211 sechdrs
[i
].sh_entsize
= ~0UL;
1213 DEBUGP("Core section allocation order:\n");
1214 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1215 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1216 Elf_Shdr
*s
= &sechdrs
[i
];
1218 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1219 || (s
->sh_flags
& masks
[m
][1])
1220 || s
->sh_entsize
!= ~0UL
1221 || strncmp(secstrings
+ s
->sh_name
,
1224 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1225 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1228 mod
->core_text_size
= mod
->core_size
;
1231 DEBUGP("Init section allocation order:\n");
1232 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1233 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1234 Elf_Shdr
*s
= &sechdrs
[i
];
1236 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1237 || (s
->sh_flags
& masks
[m
][1])
1238 || s
->sh_entsize
!= ~0UL
1239 || strncmp(secstrings
+ s
->sh_name
,
1242 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1243 | INIT_OFFSET_MASK
);
1244 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1247 mod
->init_text_size
= mod
->init_size
;
1251 static inline int license_is_gpl_compatible(const char *license
)
1253 return (strcmp(license
, "GPL") == 0
1254 || strcmp(license
, "GPL v2") == 0
1255 || strcmp(license
, "GPL and additional rights") == 0
1256 || strcmp(license
, "Dual BSD/GPL") == 0
1257 || strcmp(license
, "Dual MPL/GPL") == 0);
1260 static void set_license(struct module
*mod
, const char *license
)
1263 license
= "unspecified";
1265 mod
->license_gplok
= license_is_gpl_compatible(license
);
1266 if (!mod
->license_gplok
&& !(tainted
& TAINT_PROPRIETARY_MODULE
)) {
1267 printk(KERN_WARNING
"%s: module license '%s' taints kernel.\n",
1268 mod
->name
, license
);
1269 add_taint(TAINT_PROPRIETARY_MODULE
);
1273 /* Parse tag=value strings from .modinfo section */
1274 static char *next_string(char *string
, unsigned long *secsize
)
1276 /* Skip non-zero chars */
1279 if ((*secsize
)-- <= 1)
1283 /* Skip any zero padding. */
1284 while (!string
[0]) {
1286 if ((*secsize
)-- <= 1)
1292 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1297 unsigned int taglen
= strlen(tag
);
1298 unsigned long size
= sechdrs
[info
].sh_size
;
1300 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1301 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1302 return p
+ taglen
+ 1;
1307 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1308 unsigned int infoindex
)
1310 struct module_attribute
*attr
;
1313 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1316 get_modinfo(sechdrs
,
1322 #ifdef CONFIG_KALLSYMS
1323 int is_exported(const char *name
, const struct module
*mod
)
1325 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1328 if (lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1335 static char elf_type(const Elf_Sym
*sym
,
1337 const char *secstrings
,
1340 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1341 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1346 if (sym
->st_shndx
== SHN_UNDEF
)
1348 if (sym
->st_shndx
== SHN_ABS
)
1350 if (sym
->st_shndx
>= SHN_LORESERVE
)
1352 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1354 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1355 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1356 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1358 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1363 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1364 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1369 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1370 ".debug", strlen(".debug")) == 0)
1375 static void add_kallsyms(struct module
*mod
,
1377 unsigned int symindex
,
1378 unsigned int strindex
,
1379 const char *secstrings
)
1383 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1384 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1385 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1387 /* Set types up while we still have access to sections. */
1388 for (i
= 0; i
< mod
->num_symtab
; i
++)
1389 mod
->symtab
[i
].st_info
1390 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1393 static inline void add_kallsyms(struct module
*mod
,
1395 unsigned int symindex
,
1396 unsigned int strindex
,
1397 const char *secstrings
)
1400 #endif /* CONFIG_KALLSYMS */
1402 /* Allocate and load the module: note that size of section 0 is always
1403 zero, and we rely on this for optional sections. */
1404 static struct module
*load_module(void __user
*umod
,
1406 const char __user
*uargs
)
1410 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1411 unsigned int i
, symindex
= 0, strindex
= 0, setupindex
, exindex
,
1412 exportindex
, modindex
, obsparmindex
, infoindex
, gplindex
,
1413 crcindex
, gplcrcindex
, versindex
, pcpuindex
, gplfutureindex
,
1417 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1418 struct exception_table_entry
*extable
;
1419 mm_segment_t old_fs
;
1421 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1423 if (len
< sizeof(*hdr
))
1424 return ERR_PTR(-ENOEXEC
);
1426 /* Suck in entire file: we'll want most of it. */
1427 /* vmalloc barfs on "unusual" numbers. Check here */
1428 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1429 return ERR_PTR(-ENOMEM
);
1430 if (copy_from_user(hdr
, umod
, len
) != 0) {
1435 /* Sanity checks against insmoding binaries or wrong arch,
1436 weird elf version */
1437 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1438 || hdr
->e_type
!= ET_REL
1439 || !elf_check_arch(hdr
)
1440 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1445 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1448 /* Convenience variables */
1449 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1450 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1451 sechdrs
[0].sh_addr
= 0;
1453 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1454 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1455 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1458 /* Mark all sections sh_addr with their address in the
1460 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1462 /* Internal symbols and strings. */
1463 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1465 strindex
= sechdrs
[i
].sh_link
;
1466 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1468 #ifndef CONFIG_MODULE_UNLOAD
1469 /* Don't load .exit sections */
1470 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1471 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1475 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1476 ".gnu.linkonce.this_module");
1478 printk(KERN_WARNING
"No module found in object\n");
1482 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1484 if (symindex
== 0) {
1485 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1491 /* Optional sections */
1492 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1493 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1494 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1495 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1496 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1497 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1498 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1499 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1500 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1501 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1502 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1503 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1505 /* Don't keep modinfo section */
1506 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1507 #ifdef CONFIG_KALLSYMS
1508 /* Keep symbol and string tables for decoding later. */
1509 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1510 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1513 /* Check module struct version now, before we try to use module. */
1514 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1519 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1520 /* This is allowed: modprobe --force will invalidate it. */
1522 add_taint(TAINT_FORCED_MODULE
);
1523 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1525 } else if (!same_magic(modmagic
, vermagic
)) {
1526 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1527 mod
->name
, modmagic
, vermagic
);
1532 /* Now copy in args */
1533 args
= strndup_user(uargs
, ~0UL >> 1);
1535 err
= PTR_ERR(args
);
1539 if (find_module(mod
->name
)) {
1544 mod
->state
= MODULE_STATE_COMING
;
1546 /* Allow arches to frob section contents and sizes. */
1547 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1552 /* We have a special allocation for this section. */
1553 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1554 sechdrs
[pcpuindex
].sh_addralign
,
1560 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1561 mod
->percpu
= percpu
;
1564 /* Determine total sizes, and put offsets in sh_entsize. For now
1565 this is done generically; there doesn't appear to be any
1566 special cases for the architectures. */
1567 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1569 /* Do the allocs. */
1570 ptr
= module_alloc(mod
->core_size
);
1575 memset(ptr
, 0, mod
->core_size
);
1576 mod
->module_core
= ptr
;
1578 ptr
= module_alloc(mod
->init_size
);
1579 if (!ptr
&& mod
->init_size
) {
1583 memset(ptr
, 0, mod
->init_size
);
1584 mod
->module_init
= ptr
;
1586 /* Transfer each section which specifies SHF_ALLOC */
1587 DEBUGP("final section addresses:\n");
1588 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1591 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1594 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1595 dest
= mod
->module_init
1596 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1598 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1600 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1601 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1602 sechdrs
[i
].sh_size
);
1603 /* Update sh_addr to point to copy in image. */
1604 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1605 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1607 /* Module has been moved. */
1608 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1610 /* Now we've moved module, initialize linked lists, etc. */
1611 module_unload_init(mod
);
1613 /* Set up license info based on the info section */
1614 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1616 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1617 add_taint(TAINT_PROPRIETARY_MODULE
);
1618 if (strcmp(mod
->name
, "driverloader") == 0)
1619 add_taint(TAINT_PROPRIETARY_MODULE
);
1621 /* Set up MODINFO_ATTR fields */
1622 setup_modinfo(mod
, sechdrs
, infoindex
);
1624 /* Fix up syms, so that st_value is a pointer to location. */
1625 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1630 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1631 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1632 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1634 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1635 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1636 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1638 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1639 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1640 sizeof(*mod
->gpl_future_syms
);
1641 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1642 if (gplfuturecrcindex
)
1643 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1645 #ifdef CONFIG_MODVERSIONS
1646 if ((mod
->num_syms
&& !crcindex
) ||
1647 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
1648 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
)) {
1649 printk(KERN_WARNING
"%s: No versions for exported symbols."
1650 " Tainting kernel.\n", mod
->name
);
1651 add_taint(TAINT_FORCED_MODULE
);
1655 /* Now do relocations. */
1656 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1657 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
1658 unsigned int info
= sechdrs
[i
].sh_info
;
1660 /* Not a valid relocation section? */
1661 if (info
>= hdr
->e_shnum
)
1664 /* Don't bother with non-allocated sections */
1665 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
1668 if (sechdrs
[i
].sh_type
== SHT_REL
)
1669 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
1670 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
1671 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
1677 /* Find duplicate symbols */
1678 err
= verify_export_symbols(mod
);
1683 /* Set up and sort exception table */
1684 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
1685 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
1686 sort_extable(extable
, extable
+ mod
->num_exentries
);
1688 /* Finally, copy percpu area over. */
1689 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
1690 sechdrs
[pcpuindex
].sh_size
);
1692 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
1694 err
= module_finalize(hdr
, sechdrs
, mod
);
1698 /* flush the icache in correct context */
1703 * Flush the instruction cache, since we've played with text.
1704 * Do it before processing of module parameters, so the module
1705 * can provide parameter accessor functions of its own.
1707 if (mod
->module_init
)
1708 flush_icache_range((unsigned long)mod
->module_init
,
1709 (unsigned long)mod
->module_init
1711 flush_icache_range((unsigned long)mod
->module_core
,
1712 (unsigned long)mod
->module_core
+ mod
->core_size
);
1718 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
1721 /* Size of section 0 is 0, so this works well if no params */
1722 err
= parse_args(mod
->name
, mod
->args
,
1723 (struct kernel_param
*)
1724 sechdrs
[setupindex
].sh_addr
,
1725 sechdrs
[setupindex
].sh_size
1726 / sizeof(struct kernel_param
),
1731 err
= mod_sysfs_setup(mod
,
1732 (struct kernel_param
*)
1733 sechdrs
[setupindex
].sh_addr
,
1734 sechdrs
[setupindex
].sh_size
1735 / sizeof(struct kernel_param
));
1738 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
1740 /* Get rid of temporary copy */
1747 module_arch_cleanup(mod
);
1749 module_unload_free(mod
);
1750 module_free(mod
, mod
->module_init
);
1752 module_free(mod
, mod
->module_core
);
1755 percpu_modfree(percpu
);
1760 return ERR_PTR(err
);
1763 printk(KERN_ERR
"Module len %lu truncated\n", len
);
1769 * link the module with the whole machine is stopped with interrupts off
1770 * - this defends against kallsyms not taking locks
1772 static int __link_module(void *_mod
)
1774 struct module
*mod
= _mod
;
1775 list_add(&mod
->list
, &modules
);
1779 /* This is where the real work happens */
1781 sys_init_module(void __user
*umod
,
1783 const char __user
*uargs
)
1788 /* Must have permission */
1789 if (!capable(CAP_SYS_MODULE
))
1792 /* Only one module load at a time, please */
1793 if (mutex_lock_interruptible(&module_mutex
) != 0)
1796 /* Do all the hard work */
1797 mod
= load_module(umod
, len
, uargs
);
1799 mutex_unlock(&module_mutex
);
1800 return PTR_ERR(mod
);
1803 /* Now sew it into the lists. They won't access us, since
1804 strong_try_module_get() will fail. */
1805 stop_machine_run(__link_module
, mod
, NR_CPUS
);
1807 /* Drop lock so they can recurse */
1808 mutex_unlock(&module_mutex
);
1810 blocking_notifier_call_chain(&module_notify_list
,
1811 MODULE_STATE_COMING
, mod
);
1813 /* Start the module */
1814 if (mod
->init
!= NULL
)
1817 /* Init routine failed: abort. Try to protect us from
1818 buggy refcounters. */
1819 mod
->state
= MODULE_STATE_GOING
;
1820 synchronize_sched();
1822 printk(KERN_ERR
"%s: module is now stuck!\n",
1826 mutex_lock(&module_mutex
);
1828 mutex_unlock(&module_mutex
);
1833 /* Now it's a first class citizen! */
1834 mutex_lock(&module_mutex
);
1835 mod
->state
= MODULE_STATE_LIVE
;
1836 /* Drop initial reference. */
1838 module_free(mod
, mod
->module_init
);
1839 mod
->module_init
= NULL
;
1841 mod
->init_text_size
= 0;
1842 mutex_unlock(&module_mutex
);
1847 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
1849 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
1852 #ifdef CONFIG_KALLSYMS
1854 * This ignores the intensely annoying "mapping symbols" found
1855 * in ARM ELF files: $a, $t and $d.
1857 static inline int is_arm_mapping_symbol(const char *str
)
1859 return str
[0] == '$' && strchr("atd", str
[1])
1860 && (str
[2] == '\0' || str
[2] == '.');
1863 static const char *get_ksymbol(struct module
*mod
,
1865 unsigned long *size
,
1866 unsigned long *offset
)
1868 unsigned int i
, best
= 0;
1869 unsigned long nextval
;
1871 /* At worse, next value is at end of module */
1872 if (within(addr
, mod
->module_init
, mod
->init_size
))
1873 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
1875 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
1877 /* Scan for closest preceeding symbol, and next symbol. (ELF
1878 starts real symbols at 1). */
1879 for (i
= 1; i
< mod
->num_symtab
; i
++) {
1880 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
1883 /* We ignore unnamed symbols: they're uninformative
1884 * and inserted at a whim. */
1885 if (mod
->symtab
[i
].st_value
<= addr
1886 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
1887 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1888 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1890 if (mod
->symtab
[i
].st_value
> addr
1891 && mod
->symtab
[i
].st_value
< nextval
1892 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
1893 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
1894 nextval
= mod
->symtab
[i
].st_value
;
1900 *size
= nextval
- mod
->symtab
[best
].st_value
;
1901 *offset
= addr
- mod
->symtab
[best
].st_value
;
1902 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
1905 /* For kallsyms to ask for address resolution. NULL means not found.
1906 We don't lock, as this is used for oops resolution and races are a
1908 const char *module_address_lookup(unsigned long addr
,
1909 unsigned long *size
,
1910 unsigned long *offset
,
1915 list_for_each_entry(mod
, &modules
, list
) {
1916 if (within(addr
, mod
->module_init
, mod
->init_size
)
1917 || within(addr
, mod
->module_core
, mod
->core_size
)) {
1918 *modname
= mod
->name
;
1919 return get_ksymbol(mod
, addr
, size
, offset
);
1925 struct module
*module_get_kallsym(unsigned int symnum
,
1926 unsigned long *value
,
1932 mutex_lock(&module_mutex
);
1933 list_for_each_entry(mod
, &modules
, list
) {
1934 if (symnum
< mod
->num_symtab
) {
1935 *value
= mod
->symtab
[symnum
].st_value
;
1936 *type
= mod
->symtab
[symnum
].st_info
;
1938 mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
1940 mutex_unlock(&module_mutex
);
1943 symnum
-= mod
->num_symtab
;
1945 mutex_unlock(&module_mutex
);
1949 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
1953 for (i
= 0; i
< mod
->num_symtab
; i
++)
1954 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
1955 mod
->symtab
[i
].st_info
!= 'U')
1956 return mod
->symtab
[i
].st_value
;
1960 /* Look for this name: can be of form module:name. */
1961 unsigned long module_kallsyms_lookup_name(const char *name
)
1965 unsigned long ret
= 0;
1967 /* Don't lock: we're in enough trouble already. */
1968 if ((colon
= strchr(name
, ':')) != NULL
) {
1970 if ((mod
= find_module(name
)) != NULL
)
1971 ret
= mod_find_symname(mod
, colon
+1);
1974 list_for_each_entry(mod
, &modules
, list
)
1975 if ((ret
= mod_find_symname(mod
, name
)) != 0)
1980 #endif /* CONFIG_KALLSYMS */
1982 /* Called by the /proc file system to return a list of modules. */
1983 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
1985 struct list_head
*i
;
1988 mutex_lock(&module_mutex
);
1989 list_for_each(i
, &modules
) {
1998 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2000 struct list_head
*i
= p
;
2002 if (i
->next
== &modules
)
2007 static void m_stop(struct seq_file
*m
, void *p
)
2009 mutex_unlock(&module_mutex
);
2012 static int m_show(struct seq_file
*m
, void *p
)
2014 struct module
*mod
= list_entry(p
, struct module
, list
);
2015 seq_printf(m
, "%s %lu",
2016 mod
->name
, mod
->init_size
+ mod
->core_size
);
2017 print_unload_info(m
, mod
);
2019 /* Informative for users. */
2020 seq_printf(m
, " %s",
2021 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2022 mod
->state
== MODULE_STATE_COMING
? "Loading":
2024 /* Used by oprofile and other similar tools. */
2025 seq_printf(m
, " 0x%p", mod
->module_core
);
2027 seq_printf(m
, "\n");
2031 /* Format: modulename size refcount deps address
2033 Where refcount is a number or -, and deps is a comma-separated list
2036 struct seq_operations modules_op
= {
2043 /* Given an address, look for it in the module exception tables. */
2044 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2046 unsigned long flags
;
2047 const struct exception_table_entry
*e
= NULL
;
2050 spin_lock_irqsave(&modlist_lock
, flags
);
2051 list_for_each_entry(mod
, &modules
, list
) {
2052 if (mod
->num_exentries
== 0)
2055 e
= search_extable(mod
->extable
,
2056 mod
->extable
+ mod
->num_exentries
- 1,
2061 spin_unlock_irqrestore(&modlist_lock
, flags
);
2063 /* Now, if we found one, we are running inside it now, hence
2064 we cannot unload the module, hence no refcnt needed. */
2068 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2069 struct module
*__module_text_address(unsigned long addr
)
2073 list_for_each_entry(mod
, &modules
, list
)
2074 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2075 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2080 struct module
*module_text_address(unsigned long addr
)
2083 unsigned long flags
;
2085 spin_lock_irqsave(&modlist_lock
, flags
);
2086 mod
= __module_text_address(addr
);
2087 spin_unlock_irqrestore(&modlist_lock
, flags
);
2092 /* Don't grab lock, we're oopsing. */
2093 void print_modules(void)
2097 printk("Modules linked in:");
2098 list_for_each_entry(mod
, &modules
, list
)
2099 printk(" %s", mod
->name
);
2103 void module_add_driver(struct module
*mod
, struct device_driver
*drv
)
2108 /* Don't check return code; this call is idempotent */
2109 sysfs_create_link(&drv
->kobj
, &mod
->mkobj
.kobj
, "module");
2111 EXPORT_SYMBOL(module_add_driver
);
2113 void module_remove_driver(struct device_driver
*drv
)
2117 sysfs_remove_link(&drv
->kobj
, "module");
2119 EXPORT_SYMBOL(module_remove_driver
);
2121 #ifdef CONFIG_MODVERSIONS
2122 /* Generate the signature for struct module here, too, for modversions. */
2123 void struct_module(struct module
*mod
) { return; }
2124 EXPORT_SYMBOL(struct_module
);