1/*
2 * Check decoding of setuid/setgid/setuid32/setgid32 syscalls.
3 *
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <errno.h>
31#include <stdio.h>
32#include <unistd.h>
33
34void
35printuid(unsigned UGID_TYPE id)
36{
37	if (id == (unsigned UGID_TYPE) -1U)
38		printf("-1");
39	else
40		printf("%u", id);
41}
42
43int
44main(void)
45{
46	unsigned int ugid = GETUGID;
47	CHECK_OVERFLOWUGID(ugid);
48
49	const long tests[] = {
50		ugid,
51		0xffff0000U | ugid,
52		(unsigned long) 0xffffffff00000000ULL | ugid,
53		0xffffU,
54		-1U,
55		-1L
56	};
57
58	unsigned int i;
59
60	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
61		const unsigned int num = (unsigned UGID_TYPE) tests[i];
62		long expected;
63
64		if (num == ugid)
65			expected = 0;
66		else if ((UGID_TYPE) num == (UGID_TYPE) -1U)
67			expected = -1;
68		else
69			continue;
70
71		const long rc = syscall(SYSCALL_NR, tests[i]);
72		const char *errstr = sprintrc(rc);
73
74		if (rc != expected) {
75			if (!i && ENOSYS == errno) {
76				printf("%s(%u) = %s\n",
77				       SYSCALL_NAME, ugid, errstr);
78				break;
79			}
80			perror_msg_and_fail("%s(%#lx) != %ld",
81					    SYSCALL_NAME, tests[i], expected);
82		}
83
84		printf("%s(", SYSCALL_NAME);
85		printuid(num);
86		printf(") = %s\n", errstr);
87	}
88
89	puts("+++ exited with 0 +++");
90	return 0;
91}
92