1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/* Test for access to file, relative to open directory. OpenSolaris version.
Copyright (C) 2006, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
OpenSolaris bits contributed by David Bartley
<dtbartle@csclub.uwaterloo.ca>, 2009.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <unistd.h>
#include <sys/types.h>
#define E_OK 010
DECLARE_INLINE_SYSCALL (int, accessat, int, const char *, int);
int
faccessat (fd, file, type, flag)
int fd;
const char *file;
int type;
int flag;
{
if (file == NULL || (flag & ~(AT_EACCESS)) != 0
|| (type & ~(R_OK|W_OK|X_OK|F_OK|E_OK)) != 0)
{
__set_errno (EINVAL);
return -1;
}
if (fd < 0 && fd != AT_FDCWD)
{
__set_errno (EBADF);
return -1;
}
if (flag & AT_EACCESS)
{
type |= E_OK;
}
int res = INLINE_SYSCALL (accessat, 3, fd, file, type);
/* XXX: This should really be fixed in the kernel. */
if (res == 0 && (type & X_OK))
{
uid_t uid;
gid_t gid;
uid = (type & E_OK) ? geteuid () : getuid ();
gid = (type & E_OK) ? getegid () : getgid ();
if (uid == 0 || gid == 0)
{
struct stat buf;
if (fstatat (fd, file, &buf, 0) != 0)
return -1;
/* Test user bit. */
if (uid == buf.st_uid)
{
if ((buf.st_mode & S_IXUSR) == 0)
{
__set_errno (EACCES);
return -1;
}
return 0;
}
/* Test gid bit. */
if (gid == buf.st_gid)
{
if ((buf.st_mode & S_IXGRP) == 0)
{
__set_errno (EACCES);
return -1;
}
return 0;
}
/* Test other bit. */
if ((buf.st_mode & S_IXOTH) == 0)
{
__set_errno (EACCES);
return -1;
}
return 0;
}
}
return res;
}
|
