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/kallsyms.h>
23 #include <linux/sysfs.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/elf.h>
28 #include <linux/seq_file.h>
29 #include <linux/syscalls.h>
30 #include <linux/fcntl.h>
31 #include <linux/rcupdate.h>
32 #include <linux/capability.h>
33 #include <linux/cpu.h>
34 #include <linux/moduleparam.h>
35 #include <linux/errno.h>
36 #include <linux/err.h>
37 #include <linux/vermagic.h>
38 #include <linux/notifier.h>
39 #include <linux/sched.h>
40 #include <linux/stop_machine.h>
41 #include <linux/device.h>
42 #include <linux/string.h>
43 #include <linux/mutex.h>
44 #include <linux/unwind.h>
45 #include <asm/uaccess.h>
46 #include <asm/cacheflush.h>
47 #include <linux/license.h>
48 #include <asm/sections.h>
53 #define DEBUGP(fmt , a...)
56 #ifndef ARCH_SHF_SMALL
57 #define ARCH_SHF_SMALL 0
60 /* If this is set, the section belongs in the init part of the module */
61 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
63 /* List of modules, protected by module_mutex or preempt_disable
64 * (add/delete uses stop_machine). */
65 static DEFINE_MUTEX(module_mutex
);
66 static LIST_HEAD(modules
);
68 /* Waiting for a module to finish initializing? */
69 static DECLARE_WAIT_QUEUE_HEAD(module_wq
);
71 static BLOCKING_NOTIFIER_HEAD(module_notify_list
);
73 int register_module_notifier(struct notifier_block
* nb
)
75 return blocking_notifier_chain_register(&module_notify_list
, nb
);
77 EXPORT_SYMBOL(register_module_notifier
);
79 int unregister_module_notifier(struct notifier_block
* nb
)
81 return blocking_notifier_chain_unregister(&module_notify_list
, nb
);
83 EXPORT_SYMBOL(unregister_module_notifier
);
85 /* We require a truly strong try_module_get(): 0 means failure due to
86 ongoing or failed initialization etc. */
87 static inline int strong_try_module_get(struct module
*mod
)
89 if (mod
&& mod
->state
== MODULE_STATE_COMING
)
91 if (try_module_get(mod
))
97 static inline void add_taint_module(struct module
*mod
, unsigned flag
)
104 * A thread that wants to hold a reference to a module only while it
105 * is running can call this to safely exit. nfsd and lockd use this.
107 void __module_put_and_exit(struct module
*mod
, long code
)
112 EXPORT_SYMBOL(__module_put_and_exit
);
114 /* Find a module section: 0 means not found. */
115 static unsigned int find_sec(Elf_Ehdr
*hdr
,
117 const char *secstrings
,
122 for (i
= 1; i
< hdr
->e_shnum
; i
++)
123 /* Alloc bit cleared means "ignore it." */
124 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
)
125 && strcmp(secstrings
+sechdrs
[i
].sh_name
, name
) == 0)
130 /* Provided by the linker */
131 extern const struct kernel_symbol __start___ksymtab
[];
132 extern const struct kernel_symbol __stop___ksymtab
[];
133 extern const struct kernel_symbol __start___ksymtab_gpl
[];
134 extern const struct kernel_symbol __stop___ksymtab_gpl
[];
135 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
136 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
137 extern const struct kernel_symbol __start___ksymtab_unused
[];
138 extern const struct kernel_symbol __stop___ksymtab_unused
[];
139 extern const struct kernel_symbol __start___ksymtab_unused_gpl
[];
140 extern const struct kernel_symbol __stop___ksymtab_unused_gpl
[];
141 extern const struct kernel_symbol __start___ksymtab_gpl_future
[];
142 extern const struct kernel_symbol __stop___ksymtab_gpl_future
[];
143 extern const unsigned long __start___kcrctab
[];
144 extern const unsigned long __start___kcrctab_gpl
[];
145 extern const unsigned long __start___kcrctab_gpl_future
[];
146 extern const unsigned long __start___kcrctab_unused
[];
147 extern const unsigned long __start___kcrctab_unused_gpl
[];
149 #ifndef CONFIG_MODVERSIONS
150 #define symversion(base, idx) NULL
152 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
155 /* lookup symbol in given range of kernel_symbols */
156 static const struct kernel_symbol
*lookup_symbol(const char *name
,
157 const struct kernel_symbol
*start
,
158 const struct kernel_symbol
*stop
)
160 const struct kernel_symbol
*ks
= start
;
161 for (; ks
< stop
; ks
++)
162 if (strcmp(ks
->name
, name
) == 0)
167 static bool always_ok(bool gplok
, bool warn
, const char *name
)
172 static bool printk_unused_warning(bool gplok
, bool warn
, const char *name
)
175 printk(KERN_WARNING
"Symbol %s is marked as UNUSED, "
176 "however this module is using it.\n", name
);
178 "This symbol will go away in the future.\n");
180 "Please evalute if this is the right api to use and if "
181 "it really is, submit a report the linux kernel "
182 "mailinglist together with submitting your code for "
188 static bool gpl_only_unused_warning(bool gplok
, bool warn
, const char *name
)
192 return printk_unused_warning(gplok
, warn
, name
);
195 static bool gpl_only(bool gplok
, bool warn
, const char *name
)
200 static bool warn_if_not_gpl(bool gplok
, bool warn
, const char *name
)
202 if (!gplok
&& warn
) {
203 printk(KERN_WARNING
"Symbol %s is being used "
204 "by a non-GPL module, which will not "
205 "be allowed in the future\n", name
);
206 printk(KERN_WARNING
"Please see the file "
207 "Documentation/feature-removal-schedule.txt "
208 "in the kernel source tree for more details.\n");
214 const struct kernel_symbol
*start
, *stop
;
215 const unsigned long *crcs
;
216 bool (*check
)(bool gplok
, bool warn
, const char *name
);
219 /* Look through this array of symbol tables for a symbol match which
220 * passes the check function. */
221 static const struct kernel_symbol
*search_symarrays(const struct symsearch
*arr
,
226 const unsigned long **crc
)
229 const struct kernel_symbol
*ks
;
231 for (i
= 0; i
< num
; i
++) {
232 ks
= lookup_symbol(name
, arr
[i
].start
, arr
[i
].stop
);
233 if (!ks
|| !arr
[i
].check(gplok
, warn
, name
))
237 *crc
= symversion(arr
[i
].crcs
, ks
- arr
[i
].start
);
243 /* Find a symbol, return value, (optional) crc and (optional) module
245 static unsigned long find_symbol(const char *name
,
246 struct module
**owner
,
247 const unsigned long **crc
,
252 const struct kernel_symbol
*ks
;
253 const struct symsearch arr
[] = {
254 { __start___ksymtab
, __stop___ksymtab
, __start___kcrctab
,
256 { __start___ksymtab_gpl
, __stop___ksymtab_gpl
,
257 __start___kcrctab_gpl
, gpl_only
},
258 { __start___ksymtab_gpl_future
, __stop___ksymtab_gpl_future
,
259 __start___kcrctab_gpl_future
, warn_if_not_gpl
},
260 { __start___ksymtab_unused
, __stop___ksymtab_unused
,
261 __start___kcrctab_unused
, printk_unused_warning
},
262 { __start___ksymtab_unused_gpl
, __stop___ksymtab_unused_gpl
,
263 __start___kcrctab_unused_gpl
, gpl_only_unused_warning
},
266 /* Core kernel first. */
267 ks
= search_symarrays(arr
, ARRAY_SIZE(arr
), name
, gplok
, warn
, crc
);
274 /* Now try modules. */
275 list_for_each_entry(mod
, &modules
, list
) {
276 struct symsearch arr
[] = {
277 { mod
->syms
, mod
->syms
+ mod
->num_syms
, mod
->crcs
,
279 { mod
->gpl_syms
, mod
->gpl_syms
+ mod
->num_gpl_syms
,
280 mod
->gpl_crcs
, gpl_only
},
281 { mod
->gpl_future_syms
,
282 mod
->gpl_future_syms
+ mod
->num_gpl_future_syms
,
283 mod
->gpl_future_crcs
, warn_if_not_gpl
},
285 mod
->unused_syms
+ mod
->num_unused_syms
,
286 mod
->unused_crcs
, printk_unused_warning
},
287 { mod
->unused_gpl_syms
,
288 mod
->unused_gpl_syms
+ mod
->num_unused_gpl_syms
,
289 mod
->unused_gpl_crcs
, gpl_only_unused_warning
},
292 ks
= search_symarrays(arr
, ARRAY_SIZE(arr
),
293 name
, gplok
, warn
, crc
);
301 DEBUGP("Failed to find symbol %s\n", name
);
305 /* Search for module by name: must hold module_mutex. */
306 static struct module
*find_module(const char *name
)
310 list_for_each_entry(mod
, &modules
, list
) {
311 if (strcmp(mod
->name
, name
) == 0)
318 /* Number of blocks used and allocated. */
319 static unsigned int pcpu_num_used
, pcpu_num_allocated
;
320 /* Size of each block. -ve means used. */
321 static int *pcpu_size
;
323 static int split_block(unsigned int i
, unsigned short size
)
325 /* Reallocation required? */
326 if (pcpu_num_used
+ 1 > pcpu_num_allocated
) {
329 new = krealloc(pcpu_size
, sizeof(new[0])*pcpu_num_allocated
*2,
334 pcpu_num_allocated
*= 2;
338 /* Insert a new subblock */
339 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
],
340 sizeof(pcpu_size
[0]) * (pcpu_num_used
- i
));
343 pcpu_size
[i
+1] -= size
;
348 static inline unsigned int block_size(int val
)
355 static void *percpu_modalloc(unsigned long size
, unsigned long align
,
362 if (align
> PAGE_SIZE
) {
363 printk(KERN_WARNING
"%s: per-cpu alignment %li > %li\n",
364 name
, align
, PAGE_SIZE
);
368 ptr
= __per_cpu_start
;
369 for (i
= 0; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
370 /* Extra for alignment requirement. */
371 extra
= ALIGN((unsigned long)ptr
, align
) - (unsigned long)ptr
;
372 BUG_ON(i
== 0 && extra
!= 0);
374 if (pcpu_size
[i
] < 0 || pcpu_size
[i
] < extra
+ size
)
377 /* Transfer extra to previous block. */
378 if (pcpu_size
[i
-1] < 0)
379 pcpu_size
[i
-1] -= extra
;
381 pcpu_size
[i
-1] += extra
;
382 pcpu_size
[i
] -= extra
;
385 /* Split block if warranted */
386 if (pcpu_size
[i
] - size
> sizeof(unsigned long))
387 if (!split_block(i
, size
))
391 pcpu_size
[i
] = -pcpu_size
[i
];
395 printk(KERN_WARNING
"Could not allocate %lu bytes percpu data\n",
400 static void percpu_modfree(void *freeme
)
403 void *ptr
= __per_cpu_start
+ block_size(pcpu_size
[0]);
405 /* First entry is core kernel percpu data. */
406 for (i
= 1; i
< pcpu_num_used
; ptr
+= block_size(pcpu_size
[i
]), i
++) {
408 pcpu_size
[i
] = -pcpu_size
[i
];
415 /* Merge with previous? */
416 if (pcpu_size
[i
-1] >= 0) {
417 pcpu_size
[i
-1] += pcpu_size
[i
];
419 memmove(&pcpu_size
[i
], &pcpu_size
[i
+1],
420 (pcpu_num_used
- i
) * sizeof(pcpu_size
[0]));
423 /* Merge with next? */
424 if (i
+1 < pcpu_num_used
&& pcpu_size
[i
+1] >= 0) {
425 pcpu_size
[i
] += pcpu_size
[i
+1];
427 memmove(&pcpu_size
[i
+1], &pcpu_size
[i
+2],
428 (pcpu_num_used
- (i
+1)) * sizeof(pcpu_size
[0]));
432 static unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
434 const char *secstrings
)
436 return find_sec(hdr
, sechdrs
, secstrings
, ".data.percpu");
439 static void percpu_modcopy(void *pcpudest
, const void *from
, unsigned long size
)
443 for_each_possible_cpu(cpu
)
444 memcpy(pcpudest
+ per_cpu_offset(cpu
), from
, size
);
447 static int percpu_modinit(void)
450 pcpu_num_allocated
= 2;
451 pcpu_size
= kmalloc(sizeof(pcpu_size
[0]) * pcpu_num_allocated
,
453 /* Static in-kernel percpu data (used). */
454 pcpu_size
[0] = -(__per_cpu_end
-__per_cpu_start
);
456 pcpu_size
[1] = PERCPU_ENOUGH_ROOM
+ pcpu_size
[0];
457 if (pcpu_size
[1] < 0) {
458 printk(KERN_ERR
"No per-cpu room for modules.\n");
464 __initcall(percpu_modinit
);
465 #else /* ... !CONFIG_SMP */
466 static inline void *percpu_modalloc(unsigned long size
, unsigned long align
,
471 static inline void percpu_modfree(void *pcpuptr
)
475 static inline unsigned int find_pcpusec(Elf_Ehdr
*hdr
,
477 const char *secstrings
)
481 static inline void percpu_modcopy(void *pcpudst
, const void *src
,
484 /* pcpusec should be 0, and size of that section should be 0. */
487 #endif /* CONFIG_SMP */
489 #define MODINFO_ATTR(field) \
490 static void setup_modinfo_##field(struct module *mod, const char *s) \
492 mod->field = kstrdup(s, GFP_KERNEL); \
494 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
495 struct module *mod, char *buffer) \
497 return sprintf(buffer, "%s\n", mod->field); \
499 static int modinfo_##field##_exists(struct module *mod) \
501 return mod->field != NULL; \
503 static void free_modinfo_##field(struct module *mod) \
508 static struct module_attribute modinfo_##field = { \
509 .attr = { .name = __stringify(field), .mode = 0444 }, \
510 .show = show_modinfo_##field, \
511 .setup = setup_modinfo_##field, \
512 .test = modinfo_##field##_exists, \
513 .free = free_modinfo_##field, \
516 MODINFO_ATTR(version
);
517 MODINFO_ATTR(srcversion
);
519 static char last_unloaded_module
[MODULE_NAME_LEN
+1];
521 #ifdef CONFIG_MODULE_UNLOAD
522 /* Init the unload section of the module. */
523 static void module_unload_init(struct module
*mod
)
527 INIT_LIST_HEAD(&mod
->modules_which_use_me
);
528 for (i
= 0; i
< NR_CPUS
; i
++)
529 local_set(&mod
->ref
[i
].count
, 0);
530 /* Hold reference count during initialization. */
531 local_set(&mod
->ref
[raw_smp_processor_id()].count
, 1);
532 /* Backwards compatibility macros put refcount during init. */
533 mod
->waiter
= current
;
536 /* modules using other modules */
539 struct list_head list
;
540 struct module
*module_which_uses
;
543 /* Does a already use b? */
544 static int already_uses(struct module
*a
, struct module
*b
)
546 struct module_use
*use
;
548 list_for_each_entry(use
, &b
->modules_which_use_me
, list
) {
549 if (use
->module_which_uses
== a
) {
550 DEBUGP("%s uses %s!\n", a
->name
, b
->name
);
554 DEBUGP("%s does not use %s!\n", a
->name
, b
->name
);
558 /* Module a uses b */
559 static int use_module(struct module
*a
, struct module
*b
)
561 struct module_use
*use
;
564 if (b
== NULL
|| already_uses(a
, b
)) return 1;
566 /* If we're interrupted or time out, we fail. */
567 if (wait_event_interruptible_timeout(
568 module_wq
, (err
= strong_try_module_get(b
)) != -EBUSY
,
570 printk("%s: gave up waiting for init of module %s.\n",
575 /* If strong_try_module_get() returned a different error, we fail. */
579 DEBUGP("Allocating new usage for %s.\n", a
->name
);
580 use
= kmalloc(sizeof(*use
), GFP_ATOMIC
);
582 printk("%s: out of memory loading\n", a
->name
);
587 use
->module_which_uses
= a
;
588 list_add(&use
->list
, &b
->modules_which_use_me
);
589 no_warn
= sysfs_create_link(b
->holders_dir
, &a
->mkobj
.kobj
, a
->name
);
593 /* Clear the unload stuff of the module. */
594 static void module_unload_free(struct module
*mod
)
598 list_for_each_entry(i
, &modules
, list
) {
599 struct module_use
*use
;
601 list_for_each_entry(use
, &i
->modules_which_use_me
, list
) {
602 if (use
->module_which_uses
== mod
) {
603 DEBUGP("%s unusing %s\n", mod
->name
, i
->name
);
605 list_del(&use
->list
);
607 sysfs_remove_link(i
->holders_dir
, mod
->name
);
608 /* There can be at most one match. */
615 #ifdef CONFIG_MODULE_FORCE_UNLOAD
616 static inline int try_force_unload(unsigned int flags
)
618 int ret
= (flags
& O_TRUNC
);
620 add_taint(TAINT_FORCED_RMMOD
);
624 static inline int try_force_unload(unsigned int flags
)
628 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
637 /* Whole machine is stopped with interrupts off when this runs. */
638 static int __try_stop_module(void *_sref
)
640 struct stopref
*sref
= _sref
;
642 /* If it's not unused, quit unless we are told to block. */
643 if ((sref
->flags
& O_NONBLOCK
) && module_refcount(sref
->mod
) != 0) {
644 if (!(*sref
->forced
= try_force_unload(sref
->flags
)))
648 /* Mark it as dying. */
649 sref
->mod
->state
= MODULE_STATE_GOING
;
653 static int try_stop_module(struct module
*mod
, int flags
, int *forced
)
655 struct stopref sref
= { mod
, flags
, forced
};
657 return stop_machine_run(__try_stop_module
, &sref
, NR_CPUS
);
660 unsigned int module_refcount(struct module
*mod
)
662 unsigned int i
, total
= 0;
664 for (i
= 0; i
< NR_CPUS
; i
++)
665 total
+= local_read(&mod
->ref
[i
].count
);
668 EXPORT_SYMBOL(module_refcount
);
670 /* This exists whether we can unload or not */
671 static void free_module(struct module
*mod
);
673 static void wait_for_zero_refcount(struct module
*mod
)
675 /* Since we might sleep for some time, release the mutex first */
676 mutex_unlock(&module_mutex
);
678 DEBUGP("Looking at refcount...\n");
679 set_current_state(TASK_UNINTERRUPTIBLE
);
680 if (module_refcount(mod
) == 0)
684 current
->state
= TASK_RUNNING
;
685 mutex_lock(&module_mutex
);
689 sys_delete_module(const char __user
*name_user
, unsigned int flags
)
692 char name
[MODULE_NAME_LEN
];
695 if (!capable(CAP_SYS_MODULE
))
698 if (strncpy_from_user(name
, name_user
, MODULE_NAME_LEN
-1) < 0)
700 name
[MODULE_NAME_LEN
-1] = '\0';
702 if (mutex_lock_interruptible(&module_mutex
) != 0)
705 mod
= find_module(name
);
711 if (!list_empty(&mod
->modules_which_use_me
)) {
712 /* Other modules depend on us: get rid of them first. */
717 /* Doing init or already dying? */
718 if (mod
->state
!= MODULE_STATE_LIVE
) {
719 /* FIXME: if (force), slam module count and wake up
721 DEBUGP("%s already dying\n", mod
->name
);
726 /* If it has an init func, it must have an exit func to unload */
727 if (mod
->init
&& !mod
->exit
) {
728 forced
= try_force_unload(flags
);
730 /* This module can't be removed */
736 /* Set this up before setting mod->state */
737 mod
->waiter
= current
;
739 /* Stop the machine so refcounts can't move and disable module. */
740 ret
= try_stop_module(mod
, flags
, &forced
);
744 /* Never wait if forced. */
745 if (!forced
&& module_refcount(mod
) != 0)
746 wait_for_zero_refcount(mod
);
748 /* Final destruction now noone is using it. */
749 if (mod
->exit
!= NULL
) {
750 mutex_unlock(&module_mutex
);
752 mutex_lock(&module_mutex
);
754 /* Store the name of the last unloaded module for diagnostic purposes */
755 strlcpy(last_unloaded_module
, mod
->name
, sizeof(last_unloaded_module
));
759 mutex_unlock(&module_mutex
);
763 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
765 struct module_use
*use
;
766 int printed_something
= 0;
768 seq_printf(m
, " %u ", module_refcount(mod
));
770 /* Always include a trailing , so userspace can differentiate
771 between this and the old multi-field proc format. */
772 list_for_each_entry(use
, &mod
->modules_which_use_me
, list
) {
773 printed_something
= 1;
774 seq_printf(m
, "%s,", use
->module_which_uses
->name
);
777 if (mod
->init
!= NULL
&& mod
->exit
== NULL
) {
778 printed_something
= 1;
779 seq_printf(m
, "[permanent],");
782 if (!printed_something
)
786 void __symbol_put(const char *symbol
)
788 struct module
*owner
;
791 if (IS_ERR_VALUE(find_symbol(symbol
, &owner
, NULL
, true, false)))
796 EXPORT_SYMBOL(__symbol_put
);
798 void symbol_put_addr(void *addr
)
800 struct module
*modaddr
;
802 if (core_kernel_text((unsigned long)addr
))
805 if (!(modaddr
= module_text_address((unsigned long)addr
)))
809 EXPORT_SYMBOL_GPL(symbol_put_addr
);
811 static ssize_t
show_refcnt(struct module_attribute
*mattr
,
812 struct module
*mod
, char *buffer
)
814 return sprintf(buffer
, "%u\n", module_refcount(mod
));
817 static struct module_attribute refcnt
= {
818 .attr
= { .name
= "refcnt", .mode
= 0444 },
822 void module_put(struct module
*module
)
825 unsigned int cpu
= get_cpu();
826 local_dec(&module
->ref
[cpu
].count
);
827 /* Maybe they're waiting for us to drop reference? */
828 if (unlikely(!module_is_live(module
)))
829 wake_up_process(module
->waiter
);
833 EXPORT_SYMBOL(module_put
);
835 #else /* !CONFIG_MODULE_UNLOAD */
836 static void print_unload_info(struct seq_file
*m
, struct module
*mod
)
838 /* We don't know the usage count, or what modules are using. */
839 seq_printf(m
, " - -");
842 static inline void module_unload_free(struct module
*mod
)
846 static inline int use_module(struct module
*a
, struct module
*b
)
848 return strong_try_module_get(b
) == 0;
851 static inline void module_unload_init(struct module
*mod
)
854 #endif /* CONFIG_MODULE_UNLOAD */
856 static ssize_t
show_initstate(struct module_attribute
*mattr
,
857 struct module
*mod
, char *buffer
)
859 const char *state
= "unknown";
861 switch (mod
->state
) {
862 case MODULE_STATE_LIVE
:
865 case MODULE_STATE_COMING
:
868 case MODULE_STATE_GOING
:
872 return sprintf(buffer
, "%s\n", state
);
875 static struct module_attribute initstate
= {
876 .attr
= { .name
= "initstate", .mode
= 0444 },
877 .show
= show_initstate
,
880 static struct module_attribute
*modinfo_attrs
[] = {
884 #ifdef CONFIG_MODULE_UNLOAD
890 static const char vermagic
[] = VERMAGIC_STRING
;
892 #ifdef CONFIG_MODVERSIONS
893 static int check_version(Elf_Shdr
*sechdrs
,
894 unsigned int versindex
,
897 const unsigned long *crc
)
899 unsigned int i
, num_versions
;
900 struct modversion_info
*versions
;
902 /* Exporting module didn't supply crcs? OK, we're already tainted. */
906 versions
= (void *) sechdrs
[versindex
].sh_addr
;
907 num_versions
= sechdrs
[versindex
].sh_size
908 / sizeof(struct modversion_info
);
910 for (i
= 0; i
< num_versions
; i
++) {
911 if (strcmp(versions
[i
].name
, symname
) != 0)
914 if (versions
[i
].crc
== *crc
)
916 printk("%s: disagrees about version of symbol %s\n",
918 DEBUGP("Found checksum %lX vs module %lX\n",
919 *crc
, versions
[i
].crc
);
922 /* Not in module's version table. OK, but that taints the kernel. */
923 if (!(tainted
& TAINT_FORCED_MODULE
))
924 printk("%s: no version for \"%s\" found: kernel tainted.\n",
926 add_taint_module(mod
, TAINT_FORCED_MODULE
);
930 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
931 unsigned int versindex
,
934 const unsigned long *crc
;
936 if (IS_ERR_VALUE(find_symbol("struct_module", NULL
, &crc
, true, false)))
938 return check_version(sechdrs
, versindex
, "struct_module", mod
, crc
);
941 /* First part is kernel version, which we ignore. */
942 static inline int same_magic(const char *amagic
, const char *bmagic
)
944 amagic
+= strcspn(amagic
, " ");
945 bmagic
+= strcspn(bmagic
, " ");
946 return strcmp(amagic
, bmagic
) == 0;
949 static inline int check_version(Elf_Shdr
*sechdrs
,
950 unsigned int versindex
,
953 const unsigned long *crc
)
958 static inline int check_modstruct_version(Elf_Shdr
*sechdrs
,
959 unsigned int versindex
,
965 static inline int same_magic(const char *amagic
, const char *bmagic
)
967 return strcmp(amagic
, bmagic
) == 0;
969 #endif /* CONFIG_MODVERSIONS */
971 /* Resolve a symbol for this module. I.e. if we find one, record usage.
972 Must be holding module_mutex. */
973 static unsigned long resolve_symbol(Elf_Shdr
*sechdrs
,
974 unsigned int versindex
,
978 struct module
*owner
;
980 const unsigned long *crc
;
982 ret
= find_symbol(name
, &owner
, &crc
,
983 !(mod
->taints
& TAINT_PROPRIETARY_MODULE
), true);
984 if (!IS_ERR_VALUE(ret
)) {
985 /* use_module can fail due to OOM,
986 or module initialization or unloading */
987 if (!check_version(sechdrs
, versindex
, name
, mod
, crc
) ||
988 !use_module(mod
, owner
))
995 * /sys/module/foo/sections stuff
996 * J. Corbet <corbet@lwn.net>
998 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
999 struct module_sect_attr
1001 struct module_attribute mattr
;
1003 unsigned long address
;
1006 struct module_sect_attrs
1008 struct attribute_group grp
;
1009 unsigned int nsections
;
1010 struct module_sect_attr attrs
[0];
1013 static ssize_t
module_sect_show(struct module_attribute
*mattr
,
1014 struct module
*mod
, char *buf
)
1016 struct module_sect_attr
*sattr
=
1017 container_of(mattr
, struct module_sect_attr
, mattr
);
1018 return sprintf(buf
, "0x%lx\n", sattr
->address
);
1021 static void free_sect_attrs(struct module_sect_attrs
*sect_attrs
)
1023 unsigned int section
;
1025 for (section
= 0; section
< sect_attrs
->nsections
; section
++)
1026 kfree(sect_attrs
->attrs
[section
].name
);
1030 static void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1031 char *secstrings
, Elf_Shdr
*sechdrs
)
1033 unsigned int nloaded
= 0, i
, size
[2];
1034 struct module_sect_attrs
*sect_attrs
;
1035 struct module_sect_attr
*sattr
;
1036 struct attribute
**gattr
;
1038 /* Count loaded sections and allocate structures */
1039 for (i
= 0; i
< nsect
; i
++)
1040 if (sechdrs
[i
].sh_flags
& SHF_ALLOC
)
1042 size
[0] = ALIGN(sizeof(*sect_attrs
)
1043 + nloaded
* sizeof(sect_attrs
->attrs
[0]),
1044 sizeof(sect_attrs
->grp
.attrs
[0]));
1045 size
[1] = (nloaded
+ 1) * sizeof(sect_attrs
->grp
.attrs
[0]);
1046 sect_attrs
= kzalloc(size
[0] + size
[1], GFP_KERNEL
);
1047 if (sect_attrs
== NULL
)
1050 /* Setup section attributes. */
1051 sect_attrs
->grp
.name
= "sections";
1052 sect_attrs
->grp
.attrs
= (void *)sect_attrs
+ size
[0];
1054 sect_attrs
->nsections
= 0;
1055 sattr
= §_attrs
->attrs
[0];
1056 gattr
= §_attrs
->grp
.attrs
[0];
1057 for (i
= 0; i
< nsect
; i
++) {
1058 if (! (sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1060 sattr
->address
= sechdrs
[i
].sh_addr
;
1061 sattr
->name
= kstrdup(secstrings
+ sechdrs
[i
].sh_name
,
1063 if (sattr
->name
== NULL
)
1065 sect_attrs
->nsections
++;
1066 sattr
->mattr
.show
= module_sect_show
;
1067 sattr
->mattr
.store
= NULL
;
1068 sattr
->mattr
.attr
.name
= sattr
->name
;
1069 sattr
->mattr
.attr
.mode
= S_IRUGO
;
1070 *(gattr
++) = &(sattr
++)->mattr
.attr
;
1074 if (sysfs_create_group(&mod
->mkobj
.kobj
, §_attrs
->grp
))
1077 mod
->sect_attrs
= sect_attrs
;
1080 free_sect_attrs(sect_attrs
);
1083 static void remove_sect_attrs(struct module
*mod
)
1085 if (mod
->sect_attrs
) {
1086 sysfs_remove_group(&mod
->mkobj
.kobj
,
1087 &mod
->sect_attrs
->grp
);
1088 /* We are positive that no one is using any sect attrs
1089 * at this point. Deallocate immediately. */
1090 free_sect_attrs(mod
->sect_attrs
);
1091 mod
->sect_attrs
= NULL
;
1096 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1099 struct module_notes_attrs
{
1100 struct kobject
*dir
;
1102 struct bin_attribute attrs
[0];
1105 static ssize_t
module_notes_read(struct kobject
*kobj
,
1106 struct bin_attribute
*bin_attr
,
1107 char *buf
, loff_t pos
, size_t count
)
1110 * The caller checked the pos and count against our size.
1112 memcpy(buf
, bin_attr
->private + pos
, count
);
1116 static void free_notes_attrs(struct module_notes_attrs
*notes_attrs
,
1119 if (notes_attrs
->dir
) {
1121 sysfs_remove_bin_file(notes_attrs
->dir
,
1122 ¬es_attrs
->attrs
[i
]);
1123 kobject_del(notes_attrs
->dir
);
1128 static void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1129 char *secstrings
, Elf_Shdr
*sechdrs
)
1131 unsigned int notes
, loaded
, i
;
1132 struct module_notes_attrs
*notes_attrs
;
1133 struct bin_attribute
*nattr
;
1135 /* Count notes sections and allocate structures. */
1137 for (i
= 0; i
< nsect
; i
++)
1138 if ((sechdrs
[i
].sh_flags
& SHF_ALLOC
) &&
1139 (sechdrs
[i
].sh_type
== SHT_NOTE
))
1145 notes_attrs
= kzalloc(sizeof(*notes_attrs
)
1146 + notes
* sizeof(notes_attrs
->attrs
[0]),
1148 if (notes_attrs
== NULL
)
1151 notes_attrs
->notes
= notes
;
1152 nattr
= ¬es_attrs
->attrs
[0];
1153 for (loaded
= i
= 0; i
< nsect
; ++i
) {
1154 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1156 if (sechdrs
[i
].sh_type
== SHT_NOTE
) {
1157 nattr
->attr
.name
= mod
->sect_attrs
->attrs
[loaded
].name
;
1158 nattr
->attr
.mode
= S_IRUGO
;
1159 nattr
->size
= sechdrs
[i
].sh_size
;
1160 nattr
->private = (void *) sechdrs
[i
].sh_addr
;
1161 nattr
->read
= module_notes_read
;
1167 notes_attrs
->dir
= kobject_create_and_add("notes", &mod
->mkobj
.kobj
);
1168 if (!notes_attrs
->dir
)
1171 for (i
= 0; i
< notes
; ++i
)
1172 if (sysfs_create_bin_file(notes_attrs
->dir
,
1173 ¬es_attrs
->attrs
[i
]))
1176 mod
->notes_attrs
= notes_attrs
;
1180 free_notes_attrs(notes_attrs
, i
);
1183 static void remove_notes_attrs(struct module
*mod
)
1185 if (mod
->notes_attrs
)
1186 free_notes_attrs(mod
->notes_attrs
, mod
->notes_attrs
->notes
);
1191 static inline void add_sect_attrs(struct module
*mod
, unsigned int nsect
,
1192 char *sectstrings
, Elf_Shdr
*sechdrs
)
1196 static inline void remove_sect_attrs(struct module
*mod
)
1200 static inline void add_notes_attrs(struct module
*mod
, unsigned int nsect
,
1201 char *sectstrings
, Elf_Shdr
*sechdrs
)
1205 static inline void remove_notes_attrs(struct module
*mod
)
1211 int module_add_modinfo_attrs(struct module
*mod
)
1213 struct module_attribute
*attr
;
1214 struct module_attribute
*temp_attr
;
1218 mod
->modinfo_attrs
= kzalloc((sizeof(struct module_attribute
) *
1219 (ARRAY_SIZE(modinfo_attrs
) + 1)),
1221 if (!mod
->modinfo_attrs
)
1224 temp_attr
= mod
->modinfo_attrs
;
1225 for (i
= 0; (attr
= modinfo_attrs
[i
]) && !error
; i
++) {
1227 (attr
->test
&& attr
->test(mod
))) {
1228 memcpy(temp_attr
, attr
, sizeof(*temp_attr
));
1229 error
= sysfs_create_file(&mod
->mkobj
.kobj
,&temp_attr
->attr
);
1236 void module_remove_modinfo_attrs(struct module
*mod
)
1238 struct module_attribute
*attr
;
1241 for (i
= 0; (attr
= &mod
->modinfo_attrs
[i
]); i
++) {
1242 /* pick a field to test for end of list */
1243 if (!attr
->attr
.name
)
1245 sysfs_remove_file(&mod
->mkobj
.kobj
,&attr
->attr
);
1249 kfree(mod
->modinfo_attrs
);
1252 int mod_sysfs_init(struct module
*mod
)
1255 struct kobject
*kobj
;
1257 if (!module_sysfs_initialized
) {
1258 printk(KERN_ERR
"%s: module sysfs not initialized\n",
1264 kobj
= kset_find_obj(module_kset
, mod
->name
);
1266 printk(KERN_ERR
"%s: module is already loaded\n", mod
->name
);
1272 mod
->mkobj
.mod
= mod
;
1274 memset(&mod
->mkobj
.kobj
, 0, sizeof(mod
->mkobj
.kobj
));
1275 mod
->mkobj
.kobj
.kset
= module_kset
;
1276 err
= kobject_init_and_add(&mod
->mkobj
.kobj
, &module_ktype
, NULL
,
1279 kobject_put(&mod
->mkobj
.kobj
);
1281 /* delay uevent until full sysfs population */
1286 int mod_sysfs_setup(struct module
*mod
,
1287 struct kernel_param
*kparam
,
1288 unsigned int num_params
)
1292 mod
->holders_dir
= kobject_create_and_add("holders", &mod
->mkobj
.kobj
);
1293 if (!mod
->holders_dir
) {
1298 err
= module_param_sysfs_setup(mod
, kparam
, num_params
);
1300 goto out_unreg_holders
;
1302 err
= module_add_modinfo_attrs(mod
);
1304 goto out_unreg_param
;
1306 kobject_uevent(&mod
->mkobj
.kobj
, KOBJ_ADD
);
1310 module_param_sysfs_remove(mod
);
1312 kobject_put(mod
->holders_dir
);
1314 kobject_put(&mod
->mkobj
.kobj
);
1319 static void mod_kobject_remove(struct module
*mod
)
1321 module_remove_modinfo_attrs(mod
);
1322 module_param_sysfs_remove(mod
);
1323 kobject_put(mod
->mkobj
.drivers_dir
);
1324 kobject_put(mod
->holders_dir
);
1325 kobject_put(&mod
->mkobj
.kobj
);
1329 * link the module with the whole machine is stopped with interrupts off
1330 * - this defends against kallsyms not taking locks
1332 static int __link_module(void *_mod
)
1334 struct module
*mod
= _mod
;
1335 list_add(&mod
->list
, &modules
);
1340 * unlink the module with the whole machine is stopped with interrupts off
1341 * - this defends against kallsyms not taking locks
1343 static int __unlink_module(void *_mod
)
1345 struct module
*mod
= _mod
;
1346 list_del(&mod
->list
);
1350 /* Free a module, remove from lists, etc (must hold module_mutex). */
1351 static void free_module(struct module
*mod
)
1353 /* Delete from various lists */
1354 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
1355 remove_notes_attrs(mod
);
1356 remove_sect_attrs(mod
);
1357 mod_kobject_remove(mod
);
1359 unwind_remove_table(mod
->unwind_info
, 0);
1361 /* Arch-specific cleanup. */
1362 module_arch_cleanup(mod
);
1364 /* Module unload stuff */
1365 module_unload_free(mod
);
1367 /* This may be NULL, but that's OK */
1368 module_free(mod
, mod
->module_init
);
1371 percpu_modfree(mod
->percpu
);
1373 /* Free lock-classes: */
1374 lockdep_free_key_range(mod
->module_core
, mod
->core_size
);
1376 /* Finally, free the core (containing the module structure) */
1377 module_free(mod
, mod
->module_core
);
1380 void *__symbol_get(const char *symbol
)
1382 struct module
*owner
;
1383 unsigned long value
;
1386 value
= find_symbol(symbol
, &owner
, NULL
, true, true);
1387 if (IS_ERR_VALUE(value
))
1389 else if (strong_try_module_get(owner
))
1393 return (void *)value
;
1395 EXPORT_SYMBOL_GPL(__symbol_get
);
1398 * Ensure that an exported symbol [global namespace] does not already exist
1399 * in the kernel or in some other module's exported symbol table.
1401 static int verify_export_symbols(struct module
*mod
)
1403 const char *name
= NULL
;
1404 unsigned long i
, ret
= 0;
1405 struct module
*owner
;
1406 const unsigned long *crc
;
1408 for (i
= 0; i
< mod
->num_syms
; i
++)
1409 if (!IS_ERR_VALUE(find_symbol(mod
->syms
[i
].name
,
1410 &owner
, &crc
, true, false))) {
1411 name
= mod
->syms
[i
].name
;
1416 for (i
= 0; i
< mod
->num_gpl_syms
; i
++)
1417 if (!IS_ERR_VALUE(find_symbol(mod
->gpl_syms
[i
].name
,
1418 &owner
, &crc
, true, false))) {
1419 name
= mod
->gpl_syms
[i
].name
;
1426 printk(KERN_ERR
"%s: exports duplicate symbol %s (owned by %s)\n",
1427 mod
->name
, name
, module_name(owner
));
1432 /* Change all symbols so that st_value encodes the pointer directly. */
1433 static int simplify_symbols(Elf_Shdr
*sechdrs
,
1434 unsigned int symindex
,
1436 unsigned int versindex
,
1437 unsigned int pcpuindex
,
1440 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
1441 unsigned long secbase
;
1442 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1445 for (i
= 1; i
< n
; i
++) {
1446 switch (sym
[i
].st_shndx
) {
1448 /* We compiled with -fno-common. These are not
1449 supposed to happen. */
1450 DEBUGP("Common symbol: %s\n", strtab
+ sym
[i
].st_name
);
1451 printk("%s: please compile with -fno-common\n",
1457 /* Don't need to do anything */
1458 DEBUGP("Absolute symbol: 0x%08lx\n",
1459 (long)sym
[i
].st_value
);
1464 = resolve_symbol(sechdrs
, versindex
,
1465 strtab
+ sym
[i
].st_name
, mod
);
1467 /* Ok if resolved. */
1468 if (!IS_ERR_VALUE(sym
[i
].st_value
))
1471 if (ELF_ST_BIND(sym
[i
].st_info
) == STB_WEAK
)
1474 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
1475 mod
->name
, strtab
+ sym
[i
].st_name
);
1480 /* Divert to percpu allocation if a percpu var. */
1481 if (sym
[i
].st_shndx
== pcpuindex
)
1482 secbase
= (unsigned long)mod
->percpu
;
1484 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
1485 sym
[i
].st_value
+= secbase
;
1493 /* Update size with this section: return offset. */
1494 static long get_offset(unsigned long *size
, Elf_Shdr
*sechdr
)
1498 ret
= ALIGN(*size
, sechdr
->sh_addralign
?: 1);
1499 *size
= ret
+ sechdr
->sh_size
;
1503 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1504 might -- code, read-only data, read-write data, small data. Tally
1505 sizes, and place the offsets into sh_entsize fields: high bit means it
1507 static void layout_sections(struct module
*mod
,
1508 const Elf_Ehdr
*hdr
,
1510 const char *secstrings
)
1512 static unsigned long const masks
[][2] = {
1513 /* NOTE: all executable code must be the first section
1514 * in this array; otherwise modify the text_size
1515 * finder in the two loops below */
1516 { SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1517 { SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
1518 { SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
1519 { ARCH_SHF_SMALL
| SHF_ALLOC
, 0 }
1523 for (i
= 0; i
< hdr
->e_shnum
; i
++)
1524 sechdrs
[i
].sh_entsize
= ~0UL;
1526 DEBUGP("Core section allocation order:\n");
1527 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1528 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1529 Elf_Shdr
*s
= &sechdrs
[i
];
1531 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1532 || (s
->sh_flags
& masks
[m
][1])
1533 || s
->sh_entsize
!= ~0UL
1534 || strncmp(secstrings
+ s
->sh_name
,
1537 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
1538 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1541 mod
->core_text_size
= mod
->core_size
;
1544 DEBUGP("Init section allocation order:\n");
1545 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
1546 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
1547 Elf_Shdr
*s
= &sechdrs
[i
];
1549 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
1550 || (s
->sh_flags
& masks
[m
][1])
1551 || s
->sh_entsize
!= ~0UL
1552 || strncmp(secstrings
+ s
->sh_name
,
1555 s
->sh_entsize
= (get_offset(&mod
->init_size
, s
)
1556 | INIT_OFFSET_MASK
);
1557 DEBUGP("\t%s\n", secstrings
+ s
->sh_name
);
1560 mod
->init_text_size
= mod
->init_size
;
1564 static void set_license(struct module
*mod
, const char *license
)
1567 license
= "unspecified";
1569 if (!license_is_gpl_compatible(license
)) {
1570 if (!(tainted
& TAINT_PROPRIETARY_MODULE
))
1571 printk(KERN_WARNING
"%s: module license '%s' taints "
1572 "kernel.\n", mod
->name
, license
);
1573 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1577 /* Parse tag=value strings from .modinfo section */
1578 static char *next_string(char *string
, unsigned long *secsize
)
1580 /* Skip non-zero chars */
1583 if ((*secsize
)-- <= 1)
1587 /* Skip any zero padding. */
1588 while (!string
[0]) {
1590 if ((*secsize
)-- <= 1)
1596 static char *get_modinfo(Elf_Shdr
*sechdrs
,
1601 unsigned int taglen
= strlen(tag
);
1602 unsigned long size
= sechdrs
[info
].sh_size
;
1604 for (p
= (char *)sechdrs
[info
].sh_addr
; p
; p
= next_string(p
, &size
)) {
1605 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
1606 return p
+ taglen
+ 1;
1611 static void setup_modinfo(struct module
*mod
, Elf_Shdr
*sechdrs
,
1612 unsigned int infoindex
)
1614 struct module_attribute
*attr
;
1617 for (i
= 0; (attr
= modinfo_attrs
[i
]); i
++) {
1620 get_modinfo(sechdrs
,
1626 #ifdef CONFIG_KALLSYMS
1627 static int is_exported(const char *name
, const struct module
*mod
)
1629 if (!mod
&& lookup_symbol(name
, __start___ksymtab
, __stop___ksymtab
))
1632 if (mod
&& lookup_symbol(name
, mod
->syms
, mod
->syms
+ mod
->num_syms
))
1639 static char elf_type(const Elf_Sym
*sym
,
1641 const char *secstrings
,
1644 if (ELF_ST_BIND(sym
->st_info
) == STB_WEAK
) {
1645 if (ELF_ST_TYPE(sym
->st_info
) == STT_OBJECT
)
1650 if (sym
->st_shndx
== SHN_UNDEF
)
1652 if (sym
->st_shndx
== SHN_ABS
)
1654 if (sym
->st_shndx
>= SHN_LORESERVE
)
1656 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_EXECINSTR
)
1658 if (sechdrs
[sym
->st_shndx
].sh_flags
& SHF_ALLOC
1659 && sechdrs
[sym
->st_shndx
].sh_type
!= SHT_NOBITS
) {
1660 if (!(sechdrs
[sym
->st_shndx
].sh_flags
& SHF_WRITE
))
1662 else if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1667 if (sechdrs
[sym
->st_shndx
].sh_type
== SHT_NOBITS
) {
1668 if (sechdrs
[sym
->st_shndx
].sh_flags
& ARCH_SHF_SMALL
)
1673 if (strncmp(secstrings
+ sechdrs
[sym
->st_shndx
].sh_name
,
1674 ".debug", strlen(".debug")) == 0)
1679 static void add_kallsyms(struct module
*mod
,
1681 unsigned int symindex
,
1682 unsigned int strindex
,
1683 const char *secstrings
)
1687 mod
->symtab
= (void *)sechdrs
[symindex
].sh_addr
;
1688 mod
->num_symtab
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
1689 mod
->strtab
= (void *)sechdrs
[strindex
].sh_addr
;
1691 /* Set types up while we still have access to sections. */
1692 for (i
= 0; i
< mod
->num_symtab
; i
++)
1693 mod
->symtab
[i
].st_info
1694 = elf_type(&mod
->symtab
[i
], sechdrs
, secstrings
, mod
);
1697 static inline void add_kallsyms(struct module
*mod
,
1699 unsigned int symindex
,
1700 unsigned int strindex
,
1701 const char *secstrings
)
1704 #endif /* CONFIG_KALLSYMS */
1706 /* Allocate and load the module: note that size of section 0 is always
1707 zero, and we rely on this for optional sections. */
1708 static struct module
*load_module(void __user
*umod
,
1710 const char __user
*uargs
)
1714 char *secstrings
, *args
, *modmagic
, *strtab
= NULL
;
1716 unsigned int symindex
= 0;
1717 unsigned int strindex
= 0;
1718 unsigned int setupindex
;
1719 unsigned int exindex
;
1720 unsigned int exportindex
;
1721 unsigned int modindex
;
1722 unsigned int obsparmindex
;
1723 unsigned int infoindex
;
1724 unsigned int gplindex
;
1725 unsigned int crcindex
;
1726 unsigned int gplcrcindex
;
1727 unsigned int versindex
;
1728 unsigned int pcpuindex
;
1729 unsigned int gplfutureindex
;
1730 unsigned int gplfuturecrcindex
;
1731 unsigned int unwindex
= 0;
1732 unsigned int unusedindex
;
1733 unsigned int unusedcrcindex
;
1734 unsigned int unusedgplindex
;
1735 unsigned int unusedgplcrcindex
;
1736 unsigned int markersindex
;
1737 unsigned int markersstringsindex
;
1740 void *percpu
= NULL
, *ptr
= NULL
; /* Stops spurious gcc warning */
1741 struct exception_table_entry
*extable
;
1742 mm_segment_t old_fs
;
1744 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1746 if (len
< sizeof(*hdr
))
1747 return ERR_PTR(-ENOEXEC
);
1749 /* Suck in entire file: we'll want most of it. */
1750 /* vmalloc barfs on "unusual" numbers. Check here */
1751 if (len
> 64 * 1024 * 1024 || (hdr
= vmalloc(len
)) == NULL
)
1752 return ERR_PTR(-ENOMEM
);
1753 if (copy_from_user(hdr
, umod
, len
) != 0) {
1758 /* Sanity checks against insmoding binaries or wrong arch,
1759 weird elf version */
1760 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
1761 || hdr
->e_type
!= ET_REL
1762 || !elf_check_arch(hdr
)
1763 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
1768 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
))
1771 /* Convenience variables */
1772 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
1773 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
1774 sechdrs
[0].sh_addr
= 0;
1776 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
1777 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
1778 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
)
1781 /* Mark all sections sh_addr with their address in the
1783 sechdrs
[i
].sh_addr
= (size_t)hdr
+ sechdrs
[i
].sh_offset
;
1785 /* Internal symbols and strings. */
1786 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
1788 strindex
= sechdrs
[i
].sh_link
;
1789 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
1791 #ifndef CONFIG_MODULE_UNLOAD
1792 /* Don't load .exit sections */
1793 if (strncmp(secstrings
+sechdrs
[i
].sh_name
, ".exit", 5) == 0)
1794 sechdrs
[i
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1798 modindex
= find_sec(hdr
, sechdrs
, secstrings
,
1799 ".gnu.linkonce.this_module");
1801 printk(KERN_WARNING
"No module found in object\n");
1805 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1807 if (symindex
== 0) {
1808 printk(KERN_WARNING
"%s: module has no symbols (stripped?)\n",
1814 /* Optional sections */
1815 exportindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab");
1816 gplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl");
1817 gplfutureindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_gpl_future");
1818 unusedindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused");
1819 unusedgplindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ksymtab_unused_gpl");
1820 crcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab");
1821 gplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl");
1822 gplfuturecrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_gpl_future");
1823 unusedcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused");
1824 unusedgplcrcindex
= find_sec(hdr
, sechdrs
, secstrings
, "__kcrctab_unused_gpl");
1825 setupindex
= find_sec(hdr
, sechdrs
, secstrings
, "__param");
1826 exindex
= find_sec(hdr
, sechdrs
, secstrings
, "__ex_table");
1827 obsparmindex
= find_sec(hdr
, sechdrs
, secstrings
, "__obsparm");
1828 versindex
= find_sec(hdr
, sechdrs
, secstrings
, "__versions");
1829 infoindex
= find_sec(hdr
, sechdrs
, secstrings
, ".modinfo");
1830 pcpuindex
= find_pcpusec(hdr
, sechdrs
, secstrings
);
1831 #ifdef ARCH_UNWIND_SECTION_NAME
1832 unwindex
= find_sec(hdr
, sechdrs
, secstrings
, ARCH_UNWIND_SECTION_NAME
);
1835 /* Don't keep modinfo and version sections. */
1836 sechdrs
[infoindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1837 sechdrs
[versindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1838 #ifdef CONFIG_KALLSYMS
1839 /* Keep symbol and string tables for decoding later. */
1840 sechdrs
[symindex
].sh_flags
|= SHF_ALLOC
;
1841 sechdrs
[strindex
].sh_flags
|= SHF_ALLOC
;
1844 sechdrs
[unwindex
].sh_flags
|= SHF_ALLOC
;
1846 /* Check module struct version now, before we try to use module. */
1847 if (!check_modstruct_version(sechdrs
, versindex
, mod
)) {
1852 modmagic
= get_modinfo(sechdrs
, infoindex
, "vermagic");
1853 /* This is allowed: modprobe --force will invalidate it. */
1855 add_taint_module(mod
, TAINT_FORCED_MODULE
);
1856 printk(KERN_WARNING
"%s: no version magic, tainting kernel.\n",
1858 } else if (!same_magic(modmagic
, vermagic
)) {
1859 printk(KERN_ERR
"%s: version magic '%s' should be '%s'\n",
1860 mod
->name
, modmagic
, vermagic
);
1865 /* Now copy in args */
1866 args
= strndup_user(uargs
, ~0UL >> 1);
1868 err
= PTR_ERR(args
);
1872 if (find_module(mod
->name
)) {
1877 mod
->state
= MODULE_STATE_COMING
;
1879 /* Allow arches to frob section contents and sizes. */
1880 err
= module_frob_arch_sections(hdr
, sechdrs
, secstrings
, mod
);
1885 /* We have a special allocation for this section. */
1886 percpu
= percpu_modalloc(sechdrs
[pcpuindex
].sh_size
,
1887 sechdrs
[pcpuindex
].sh_addralign
,
1893 sechdrs
[pcpuindex
].sh_flags
&= ~(unsigned long)SHF_ALLOC
;
1894 mod
->percpu
= percpu
;
1897 /* Determine total sizes, and put offsets in sh_entsize. For now
1898 this is done generically; there doesn't appear to be any
1899 special cases for the architectures. */
1900 layout_sections(mod
, hdr
, sechdrs
, secstrings
);
1902 /* Do the allocs. */
1903 ptr
= module_alloc(mod
->core_size
);
1908 memset(ptr
, 0, mod
->core_size
);
1909 mod
->module_core
= ptr
;
1911 ptr
= module_alloc(mod
->init_size
);
1912 if (!ptr
&& mod
->init_size
) {
1916 memset(ptr
, 0, mod
->init_size
);
1917 mod
->module_init
= ptr
;
1919 /* Transfer each section which specifies SHF_ALLOC */
1920 DEBUGP("final section addresses:\n");
1921 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
1924 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
1927 if (sechdrs
[i
].sh_entsize
& INIT_OFFSET_MASK
)
1928 dest
= mod
->module_init
1929 + (sechdrs
[i
].sh_entsize
& ~INIT_OFFSET_MASK
);
1931 dest
= mod
->module_core
+ sechdrs
[i
].sh_entsize
;
1933 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
1934 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
1935 sechdrs
[i
].sh_size
);
1936 /* Update sh_addr to point to copy in image. */
1937 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
1938 DEBUGP("\t0x%lx %s\n", sechdrs
[i
].sh_addr
, secstrings
+ sechdrs
[i
].sh_name
);
1940 /* Module has been moved. */
1941 mod
= (void *)sechdrs
[modindex
].sh_addr
;
1943 /* Now we've moved module, initialize linked lists, etc. */
1944 module_unload_init(mod
);
1946 /* add kobject, so we can reference it. */
1947 err
= mod_sysfs_init(mod
);
1951 /* Set up license info based on the info section */
1952 set_license(mod
, get_modinfo(sechdrs
, infoindex
, "license"));
1955 * ndiswrapper is under GPL by itself, but loads proprietary modules.
1956 * Don't use add_taint_module(), as it would prevent ndiswrapper from
1957 * using GPL-only symbols it needs.
1959 if (strcmp(mod
->name
, "ndiswrapper") == 0)
1960 add_taint(TAINT_PROPRIETARY_MODULE
);
1962 /* driverloader was caught wrongly pretending to be under GPL */
1963 if (strcmp(mod
->name
, "driverloader") == 0)
1964 add_taint_module(mod
, TAINT_PROPRIETARY_MODULE
);
1966 /* Set up MODINFO_ATTR fields */
1967 setup_modinfo(mod
, sechdrs
, infoindex
);
1969 /* Fix up syms, so that st_value is a pointer to location. */
1970 err
= simplify_symbols(sechdrs
, symindex
, strtab
, versindex
, pcpuindex
,
1975 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1976 mod
->num_syms
= sechdrs
[exportindex
].sh_size
/ sizeof(*mod
->syms
);
1977 mod
->syms
= (void *)sechdrs
[exportindex
].sh_addr
;
1979 mod
->crcs
= (void *)sechdrs
[crcindex
].sh_addr
;
1980 mod
->num_gpl_syms
= sechdrs
[gplindex
].sh_size
/ sizeof(*mod
->gpl_syms
);
1981 mod
->gpl_syms
= (void *)sechdrs
[gplindex
].sh_addr
;
1983 mod
->gpl_crcs
= (void *)sechdrs
[gplcrcindex
].sh_addr
;
1984 mod
->num_gpl_future_syms
= sechdrs
[gplfutureindex
].sh_size
/
1985 sizeof(*mod
->gpl_future_syms
);
1986 mod
->num_unused_syms
= sechdrs
[unusedindex
].sh_size
/
1987 sizeof(*mod
->unused_syms
);
1988 mod
->num_unused_gpl_syms
= sechdrs
[unusedgplindex
].sh_size
/
1989 sizeof(*mod
->unused_gpl_syms
);
1990 mod
->gpl_future_syms
= (void *)sechdrs
[gplfutureindex
].sh_addr
;
1991 if (gplfuturecrcindex
)
1992 mod
->gpl_future_crcs
= (void *)sechdrs
[gplfuturecrcindex
].sh_addr
;
1994 mod
->unused_syms
= (void *)sechdrs
[unusedindex
].sh_addr
;
1996 mod
->unused_crcs
= (void *)sechdrs
[unusedcrcindex
].sh_addr
;
1997 mod
->unused_gpl_syms
= (void *)sechdrs
[unusedgplindex
].sh_addr
;
1998 if (unusedgplcrcindex
)
1999 mod
->unused_crcs
= (void *)sechdrs
[unusedgplcrcindex
].sh_addr
;
2001 #ifdef CONFIG_MODVERSIONS
2002 if ((mod
->num_syms
&& !crcindex
) ||
2003 (mod
->num_gpl_syms
&& !gplcrcindex
) ||
2004 (mod
->num_gpl_future_syms
&& !gplfuturecrcindex
) ||
2005 (mod
->num_unused_syms
&& !unusedcrcindex
) ||
2006 (mod
->num_unused_gpl_syms
&& !unusedgplcrcindex
)) {
2007 printk(KERN_WARNING
"%s: No versions for exported symbols."
2008 " Tainting kernel.\n", mod
->name
);
2009 add_taint_module(mod
, TAINT_FORCED_MODULE
);
2012 markersindex
= find_sec(hdr
, sechdrs
, secstrings
, "__markers");
2013 markersstringsindex
= find_sec(hdr
, sechdrs
, secstrings
,
2014 "__markers_strings");
2016 /* Now do relocations. */
2017 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
2018 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
2019 unsigned int info
= sechdrs
[i
].sh_info
;
2021 /* Not a valid relocation section? */
2022 if (info
>= hdr
->e_shnum
)
2025 /* Don't bother with non-allocated sections */
2026 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
2029 if (sechdrs
[i
].sh_type
== SHT_REL
)
2030 err
= apply_relocate(sechdrs
, strtab
, symindex
, i
,mod
);
2031 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
2032 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
2037 #ifdef CONFIG_MARKERS
2038 mod
->markers
= (void *)sechdrs
[markersindex
].sh_addr
;
2040 sechdrs
[markersindex
].sh_size
/ sizeof(*mod
->markers
);
2043 /* Find duplicate symbols */
2044 err
= verify_export_symbols(mod
);
2049 /* Set up and sort exception table */
2050 mod
->num_exentries
= sechdrs
[exindex
].sh_size
/ sizeof(*mod
->extable
);
2051 mod
->extable
= extable
= (void *)sechdrs
[exindex
].sh_addr
;
2052 sort_extable(extable
, extable
+ mod
->num_exentries
);
2054 /* Finally, copy percpu area over. */
2055 percpu_modcopy(mod
->percpu
, (void *)sechdrs
[pcpuindex
].sh_addr
,
2056 sechdrs
[pcpuindex
].sh_size
);
2058 add_kallsyms(mod
, sechdrs
, symindex
, strindex
, secstrings
);
2060 #ifdef CONFIG_MARKERS
2062 marker_update_probe_range(mod
->markers
,
2063 mod
->markers
+ mod
->num_markers
);
2065 err
= module_finalize(hdr
, sechdrs
, mod
);
2069 /* flush the icache in correct context */
2074 * Flush the instruction cache, since we've played with text.
2075 * Do it before processing of module parameters, so the module
2076 * can provide parameter accessor functions of its own.
2078 if (mod
->module_init
)
2079 flush_icache_range((unsigned long)mod
->module_init
,
2080 (unsigned long)mod
->module_init
2082 flush_icache_range((unsigned long)mod
->module_core
,
2083 (unsigned long)mod
->module_core
+ mod
->core_size
);
2089 printk(KERN_WARNING
"%s: Ignoring obsolete parameters\n",
2092 /* Now sew it into the lists so we can get lockdep and oops
2093 * info during argument parsing. Noone should access us, since
2094 * strong_try_module_get() will fail. */
2095 stop_machine_run(__link_module
, mod
, NR_CPUS
);
2097 /* Size of section 0 is 0, so this works well if no params */
2098 err
= parse_args(mod
->name
, mod
->args
,
2099 (struct kernel_param
*)
2100 sechdrs
[setupindex
].sh_addr
,
2101 sechdrs
[setupindex
].sh_size
2102 / sizeof(struct kernel_param
),
2107 err
= mod_sysfs_setup(mod
,
2108 (struct kernel_param
*)
2109 sechdrs
[setupindex
].sh_addr
,
2110 sechdrs
[setupindex
].sh_size
2111 / sizeof(struct kernel_param
));
2114 add_sect_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2115 add_notes_attrs(mod
, hdr
->e_shnum
, secstrings
, sechdrs
);
2117 /* Size of section 0 is 0, so this works well if no unwind info. */
2118 mod
->unwind_info
= unwind_add_table(mod
,
2119 (void *)sechdrs
[unwindex
].sh_addr
,
2120 sechdrs
[unwindex
].sh_size
);
2122 /* Get rid of temporary copy */
2129 stop_machine_run(__unlink_module
, mod
, NR_CPUS
);
2130 module_arch_cleanup(mod
);
2132 kobject_del(&mod
->mkobj
.kobj
);
2133 kobject_put(&mod
->mkobj
.kobj
);
2135 module_unload_free(mod
);
2136 module_free(mod
, mod
->module_init
);
2138 module_free(mod
, mod
->module_core
);
2141 percpu_modfree(percpu
);
2146 return ERR_PTR(err
);
2149 printk(KERN_ERR
"Module len %lu truncated\n", len
);
2154 /* This is where the real work happens */
2156 sys_init_module(void __user
*umod
,
2158 const char __user
*uargs
)
2163 /* Must have permission */
2164 if (!capable(CAP_SYS_MODULE
))
2167 /* Only one module load at a time, please */
2168 if (mutex_lock_interruptible(&module_mutex
) != 0)
2171 /* Do all the hard work */
2172 mod
= load_module(umod
, len
, uargs
);
2174 mutex_unlock(&module_mutex
);
2175 return PTR_ERR(mod
);
2178 /* Drop lock so they can recurse */
2179 mutex_unlock(&module_mutex
);
2181 blocking_notifier_call_chain(&module_notify_list
,
2182 MODULE_STATE_COMING
, mod
);
2184 /* Start the module */
2185 if (mod
->init
!= NULL
)
2188 /* Init routine failed: abort. Try to protect us from
2189 buggy refcounters. */
2190 mod
->state
= MODULE_STATE_GOING
;
2191 synchronize_sched();
2193 mutex_lock(&module_mutex
);
2195 mutex_unlock(&module_mutex
);
2196 wake_up(&module_wq
);
2200 printk(KERN_WARNING
"%s: '%s'->init suspiciously returned %d, "
2201 "it should follow 0/-E convention\n"
2202 KERN_WARNING
"%s: loading module anyway...\n",
2203 __func__
, mod
->name
, ret
,
2208 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2209 mod
->state
= MODULE_STATE_LIVE
;
2210 wake_up(&module_wq
);
2212 mutex_lock(&module_mutex
);
2213 /* Drop initial reference. */
2215 unwind_remove_table(mod
->unwind_info
, 1);
2216 module_free(mod
, mod
->module_init
);
2217 mod
->module_init
= NULL
;
2219 mod
->init_text_size
= 0;
2220 mutex_unlock(&module_mutex
);
2225 static inline int within(unsigned long addr
, void *start
, unsigned long size
)
2227 return ((void *)addr
>= start
&& (void *)addr
< start
+ size
);
2230 #ifdef CONFIG_KALLSYMS
2232 * This ignores the intensely annoying "mapping symbols" found
2233 * in ARM ELF files: $a, $t and $d.
2235 static inline int is_arm_mapping_symbol(const char *str
)
2237 return str
[0] == '$' && strchr("atd", str
[1])
2238 && (str
[2] == '\0' || str
[2] == '.');
2241 static const char *get_ksymbol(struct module
*mod
,
2243 unsigned long *size
,
2244 unsigned long *offset
)
2246 unsigned int i
, best
= 0;
2247 unsigned long nextval
;
2249 /* At worse, next value is at end of module */
2250 if (within(addr
, mod
->module_init
, mod
->init_size
))
2251 nextval
= (unsigned long)mod
->module_init
+mod
->init_text_size
;
2253 nextval
= (unsigned long)mod
->module_core
+mod
->core_text_size
;
2255 /* Scan for closest preceeding symbol, and next symbol. (ELF
2256 starts real symbols at 1). */
2257 for (i
= 1; i
< mod
->num_symtab
; i
++) {
2258 if (mod
->symtab
[i
].st_shndx
== SHN_UNDEF
)
2261 /* We ignore unnamed symbols: they're uninformative
2262 * and inserted at a whim. */
2263 if (mod
->symtab
[i
].st_value
<= addr
2264 && mod
->symtab
[i
].st_value
> mod
->symtab
[best
].st_value
2265 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2266 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2268 if (mod
->symtab
[i
].st_value
> addr
2269 && mod
->symtab
[i
].st_value
< nextval
2270 && *(mod
->strtab
+ mod
->symtab
[i
].st_name
) != '\0'
2271 && !is_arm_mapping_symbol(mod
->strtab
+ mod
->symtab
[i
].st_name
))
2272 nextval
= mod
->symtab
[i
].st_value
;
2279 *size
= nextval
- mod
->symtab
[best
].st_value
;
2281 *offset
= addr
- mod
->symtab
[best
].st_value
;
2282 return mod
->strtab
+ mod
->symtab
[best
].st_name
;
2285 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2286 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2287 const char *module_address_lookup(unsigned long addr
,
2288 unsigned long *size
,
2289 unsigned long *offset
,
2294 const char *ret
= NULL
;
2297 list_for_each_entry(mod
, &modules
, list
) {
2298 if (within(addr
, mod
->module_init
, mod
->init_size
)
2299 || within(addr
, mod
->module_core
, mod
->core_size
)) {
2301 *modname
= mod
->name
;
2302 ret
= get_ksymbol(mod
, addr
, size
, offset
);
2306 /* Make a copy in here where it's safe */
2308 strncpy(namebuf
, ret
, KSYM_NAME_LEN
- 1);
2315 int lookup_module_symbol_name(unsigned long addr
, char *symname
)
2320 list_for_each_entry(mod
, &modules
, list
) {
2321 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2322 within(addr
, mod
->module_core
, mod
->core_size
)) {
2325 sym
= get_ksymbol(mod
, addr
, NULL
, NULL
);
2328 strlcpy(symname
, sym
, KSYM_NAME_LEN
);
2338 int lookup_module_symbol_attrs(unsigned long addr
, unsigned long *size
,
2339 unsigned long *offset
, char *modname
, char *name
)
2344 list_for_each_entry(mod
, &modules
, list
) {
2345 if (within(addr
, mod
->module_init
, mod
->init_size
) ||
2346 within(addr
, mod
->module_core
, mod
->core_size
)) {
2349 sym
= get_ksymbol(mod
, addr
, size
, offset
);
2353 strlcpy(modname
, mod
->name
, MODULE_NAME_LEN
);
2355 strlcpy(name
, sym
, KSYM_NAME_LEN
);
2365 int module_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
2366 char *name
, char *module_name
, int *exported
)
2371 list_for_each_entry(mod
, &modules
, list
) {
2372 if (symnum
< mod
->num_symtab
) {
2373 *value
= mod
->symtab
[symnum
].st_value
;
2374 *type
= mod
->symtab
[symnum
].st_info
;
2375 strlcpy(name
, mod
->strtab
+ mod
->symtab
[symnum
].st_name
,
2377 strlcpy(module_name
, mod
->name
, MODULE_NAME_LEN
);
2378 *exported
= is_exported(name
, mod
);
2382 symnum
-= mod
->num_symtab
;
2388 static unsigned long mod_find_symname(struct module
*mod
, const char *name
)
2392 for (i
= 0; i
< mod
->num_symtab
; i
++)
2393 if (strcmp(name
, mod
->strtab
+mod
->symtab
[i
].st_name
) == 0 &&
2394 mod
->symtab
[i
].st_info
!= 'U')
2395 return mod
->symtab
[i
].st_value
;
2399 /* Look for this name: can be of form module:name. */
2400 unsigned long module_kallsyms_lookup_name(const char *name
)
2404 unsigned long ret
= 0;
2406 /* Don't lock: we're in enough trouble already. */
2408 if ((colon
= strchr(name
, ':')) != NULL
) {
2410 if ((mod
= find_module(name
)) != NULL
)
2411 ret
= mod_find_symname(mod
, colon
+1);
2414 list_for_each_entry(mod
, &modules
, list
)
2415 if ((ret
= mod_find_symname(mod
, name
)) != 0)
2421 #endif /* CONFIG_KALLSYMS */
2423 /* Called by the /proc file system to return a list of modules. */
2424 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
2426 mutex_lock(&module_mutex
);
2427 return seq_list_start(&modules
, *pos
);
2430 static void *m_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
2432 return seq_list_next(p
, &modules
, pos
);
2435 static void m_stop(struct seq_file
*m
, void *p
)
2437 mutex_unlock(&module_mutex
);
2440 static char *module_flags(struct module
*mod
, char *buf
)
2445 mod
->state
== MODULE_STATE_GOING
||
2446 mod
->state
== MODULE_STATE_COMING
) {
2448 if (mod
->taints
& TAINT_PROPRIETARY_MODULE
)
2450 if (mod
->taints
& TAINT_FORCED_MODULE
)
2453 * TAINT_FORCED_RMMOD: could be added.
2454 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2458 /* Show a - for module-is-being-unloaded */
2459 if (mod
->state
== MODULE_STATE_GOING
)
2461 /* Show a + for module-is-being-loaded */
2462 if (mod
->state
== MODULE_STATE_COMING
)
2471 static int m_show(struct seq_file
*m
, void *p
)
2473 struct module
*mod
= list_entry(p
, struct module
, list
);
2476 seq_printf(m
, "%s %lu",
2477 mod
->name
, mod
->init_size
+ mod
->core_size
);
2478 print_unload_info(m
, mod
);
2480 /* Informative for users. */
2481 seq_printf(m
, " %s",
2482 mod
->state
== MODULE_STATE_GOING
? "Unloading":
2483 mod
->state
== MODULE_STATE_COMING
? "Loading":
2485 /* Used by oprofile and other similar tools. */
2486 seq_printf(m
, " 0x%p", mod
->module_core
);
2490 seq_printf(m
, " %s", module_flags(mod
, buf
));
2492 seq_printf(m
, "\n");
2496 /* Format: modulename size refcount deps address
2498 Where refcount is a number or -, and deps is a comma-separated list
2501 const struct seq_operations modules_op
= {
2508 /* Given an address, look for it in the module exception tables. */
2509 const struct exception_table_entry
*search_module_extables(unsigned long addr
)
2511 const struct exception_table_entry
*e
= NULL
;
2515 list_for_each_entry(mod
, &modules
, list
) {
2516 if (mod
->num_exentries
== 0)
2519 e
= search_extable(mod
->extable
,
2520 mod
->extable
+ mod
->num_exentries
- 1,
2527 /* Now, if we found one, we are running inside it now, hence
2528 we cannot unload the module, hence no refcnt needed. */
2533 * Is this a valid module address?
2535 int is_module_address(unsigned long addr
)
2541 list_for_each_entry(mod
, &modules
, list
) {
2542 if (within(addr
, mod
->module_core
, mod
->core_size
)) {
2554 /* Is this a valid kernel address? */
2555 struct module
*__module_text_address(unsigned long addr
)
2559 list_for_each_entry(mod
, &modules
, list
)
2560 if (within(addr
, mod
->module_init
, mod
->init_text_size
)
2561 || within(addr
, mod
->module_core
, mod
->core_text_size
))
2566 struct module
*module_text_address(unsigned long addr
)
2571 mod
= __module_text_address(addr
);
2577 /* Don't grab lock, we're oopsing. */
2578 void print_modules(void)
2583 printk("Modules linked in:");
2584 list_for_each_entry(mod
, &modules
, list
)
2585 printk(" %s%s", mod
->name
, module_flags(mod
, buf
));
2586 if (last_unloaded_module
[0])
2587 printk(" [last unloaded: %s]", last_unloaded_module
);
2591 #ifdef CONFIG_MODVERSIONS
2592 /* Generate the signature for struct module here, too, for modversions. */
2593 void struct_module(struct module
*mod
) { return; }
2594 EXPORT_SYMBOL(struct_module
);
2597 #ifdef CONFIG_MARKERS
2598 void module_update_markers(void)
2602 mutex_lock(&module_mutex
);
2603 list_for_each_entry(mod
, &modules
, list
)
2605 marker_update_probe_range(mod
->markers
,
2606 mod
->markers
+ mod
->num_markers
);
2607 mutex_unlock(&module_mutex
);