Linux Kernel  3.7.1
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usercopy_64.c
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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 
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