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14cf11af PM |
1 | /* |
2 | * Functions which are too large to be inlined. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | #include <linux/module.h> | |
10 | #include <asm/uaccess.h> | |
11 | ||
12 | unsigned long copy_from_user(void *to, const void __user *from, unsigned long n) | |
13 | { | |
14 | if (likely(access_ok(VERIFY_READ, from, n))) | |
15 | n = __copy_from_user(to, from, n); | |
16 | else | |
17 | memset(to, 0, n); | |
18 | return n; | |
19 | } | |
20 | ||
21 | unsigned long copy_to_user(void __user *to, const void *from, unsigned long n) | |
22 | { | |
23 | if (likely(access_ok(VERIFY_WRITE, to, n))) | |
24 | n = __copy_to_user(to, from, n); | |
25 | return n; | |
26 | } | |
27 | ||
28 | unsigned long copy_in_user(void __user *to, const void __user *from, | |
29 | unsigned long n) | |
30 | { | |
31 | might_sleep(); | |
32 | if (likely(access_ok(VERIFY_READ, from, n) && | |
33 | access_ok(VERIFY_WRITE, to, n))) | |
34 | n =__copy_tofrom_user(to, from, n); | |
35 | return n; | |
36 | } | |
37 | ||
38 | EXPORT_SYMBOL(copy_from_user); | |
39 | EXPORT_SYMBOL(copy_to_user); | |
40 | EXPORT_SYMBOL(copy_in_user); | |
41 |