Blame view

lib/usercopy.c 764 Bytes
b24413180   Greg Kroah-Hartman   License cleanup: ...
1
  // SPDX-License-Identifier: GPL-2.0
d597580d3   Al Viro   generic ...copy_....
2
3
4
5
6
7
8
9
  #include <linux/uaccess.h>
  
  /* out-of-line parts */
  
  #ifndef INLINE_COPY_FROM_USER
  unsigned long _copy_from_user(void *to, const void __user *from, unsigned long n)
  {
  	unsigned long res = n;
9c5f6908d   Al Viro   copy_{from,to}_us...
10
11
12
  	might_fault();
  	if (likely(access_ok(VERIFY_READ, from, n))) {
  		kasan_check_write(to, n);
d597580d3   Al Viro   generic ...copy_....
13
  		res = raw_copy_from_user(to, from, n);
9c5f6908d   Al Viro   copy_{from,to}_us...
14
  	}
d597580d3   Al Viro   generic ...copy_....
15
16
17
18
19
20
21
22
  	if (unlikely(res))
  		memset(to + (n - res), 0, res);
  	return res;
  }
  EXPORT_SYMBOL(_copy_from_user);
  #endif
  
  #ifndef INLINE_COPY_TO_USER
0ced0c46b   Christophe Leroy   Fix misannotated ...
23
  unsigned long _copy_to_user(void __user *to, const void *from, unsigned long n)
d597580d3   Al Viro   generic ...copy_....
24
  {
9c5f6908d   Al Viro   copy_{from,to}_us...
25
26
27
  	might_fault();
  	if (likely(access_ok(VERIFY_WRITE, to, n))) {
  		kasan_check_read(from, n);
d597580d3   Al Viro   generic ...copy_....
28
  		n = raw_copy_to_user(to, from, n);
9c5f6908d   Al Viro   copy_{from,to}_us...
29
  	}
d597580d3   Al Viro   generic ...copy_....
30
31
32
33
  	return n;
  }
  EXPORT_SYMBOL(_copy_to_user);
  #endif