2 * Copyright (c) 2004, 2005 Darren Tucker (dtucker at zip com au).
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include "../config.h"
19 #include <sys/types.h>
25 setresuid(uid_t ruid, uid_t euid, uid_t suid)
30 /* Allow only the tested configuration. */
32 if (ruid != euid || euid != suid) {
38 if ((ret = setreuid(euid, euid)) == -1)
42 * When real, effective and saved uids are the same and we have
43 * changed uids, sanity check that we cannot restore the old uid.
46 if (ruid == euid && euid == suid && ouid != ruid &&
47 setuid(ouid) != -1 && seteuid(ouid) != -1) {
53 * Finally, check that the real and effective uids are what we
56 if (getuid() != ruid || geteuid() != euid) {