1/*
2 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * You should have received a copy of the GNU General Public License along
13 * with this program; if not, write the Free Software Foundation, Inc.,
14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
15 *
16 */
17
18/*
19 * Description: This is a setuid to root program invoked by a non-root
20 *              process to validate the mount flag MS_NOSUID.
21 *
22 *              This function exit with 0 or 1 depending upon the
23 *              success/failure of setuid(2) system call.
24 */
25
26#include <stdio.h>
27#include <sys/types.h>
28#include <unistd.h>
29#include <stdlib.h>
30#include <stdlib.h>
31#include <errno.h>
32
33/* Save the effective and real UIDs. */
34
35static uid_t ruid;
36
37/* Restore the effective UID to its original value. */
38
39int do_setuid(void)
40{
41	int status;
42
43	status = setreuid(ruid, 0);
44	if (status < 0) {
45		return 1;
46	} else {
47		return 0;
48	}
49	return 0;
50}
51
52/* Main program. */
53
54int main(void)
55{
56	int exit_status;
57
58	/* Save the real and effective user IDs.  */
59	ruid = getuid();
60	exit_status = do_setuid();
61
62	exit(exit_status);
63}
64