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
copy_from_user(void * to,const void __user * from,unsigned long n)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
copy_to_user(void __user * to,const void * from,unsigned long n)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
copy_in_user(void __user * to,const void __user * from,unsigned long n)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
42