[PATCH] uml: fix access_ok
[linux-2.6.git] / arch / um / kernel / tt / uaccess.c
1 /*
2  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
3  * Licensed under the GPL
4  */
5
6 #include "linux/sched.h"
7 #include "asm/uaccess.h"
8
9 int copy_from_user_tt(void *to, const void __user *from, int n)
10 {
11         if(!access_ok(VERIFY_READ, from, n))
12                 return(n);
13
14         return(__do_copy_from_user(to, from, n, &current->thread.fault_addr,
15                                    &current->thread.fault_catcher));
16 }
17
18 int copy_to_user_tt(void __user *to, const void *from, int n)
19 {
20         if(!access_ok(VERIFY_WRITE, to, n))
21                 return(n);
22
23         return(__do_copy_to_user(to, from, n, &current->thread.fault_addr,
24                                  &current->thread.fault_catcher));
25 }
26
27 int strncpy_from_user_tt(char *dst, const char __user *src, int count)
28 {
29         int n;
30
31         if(!access_ok(VERIFY_READ, src, 1))
32                 return(-EFAULT);
33
34         n = __do_strncpy_from_user(dst, src, count,
35                                    &current->thread.fault_addr,
36                                    &current->thread.fault_catcher);
37         if(n < 0) return(-EFAULT);
38         return(n);
39 }
40
41 int __clear_user_tt(void __user *mem, int len)
42 {
43         return(__do_clear_user(mem, len,
44                                &current->thread.fault_addr,
45                                &current->thread.fault_catcher));
46 }
47
48 int clear_user_tt(void __user *mem, int len)
49 {
50         if(!access_ok(VERIFY_WRITE, mem, len))
51                 return(len);
52
53         return(__do_clear_user(mem, len, &current->thread.fault_addr,
54                                &current->thread.fault_catcher));
55 }
56
57 int strnlen_user_tt(const void __user *str, int len)
58 {
59         return(__do_strnlen_user(str, len,
60                                  &current->thread.fault_addr,
61                                  &current->thread.fault_catcher));
62 }
63
64 /*
65  * Overrides for Emacs so that we follow Linus's tabbing style.
66  * Emacs will notice this stuff at the end of the file and automatically
67  * adjust the settings for this buffer only.  This must remain at the end
68  * of the file.
69  * ---------------------------------------------------------------------------
70  * Local variables:
71  * c-file-style: "linux"
72  * End:
73  */