1/*
2 * Check decoding of setresuid/setresgid/setresuid32/setresgid32 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
34static int
35ugid2int(const unsigned UGID_TYPE ugid)
36{
37	if ((unsigned UGID_TYPE) -1U == ugid)
38		return -1;
39	else
40		return ugid;
41}
42
43static void
44print_int(const unsigned int num)
45{
46	if (num == -1U)
47		printf("-1");
48	else
49		printf("%u", num);
50}
51
52static int
53num_matches_id(const unsigned int num, const unsigned int ugid)
54{
55	return num == ugid || num == -1U;
56}
57
58#define TRIPLE(val)	\
59	{ val, ugid, ugid }, { ugid, val, ugid }, { ugid, ugid, val }
60
61int
62main(void)
63{
64	unsigned int ugid = GETUGID;
65	CHECK_OVERFLOWUGID(ugid);
66
67	const struct {
68		const long r, e, s;
69	} tests[] = {
70		{ ugid, ugid, ugid },
71		TRIPLE((unsigned long) 0xffffffff00000000ULL | ugid),
72		TRIPLE(-1U),
73		TRIPLE(-1L),
74		TRIPLE(0xffff0000U | ugid),
75		TRIPLE(0xffff),
76		TRIPLE(0xc0deffffU)
77	};
78
79	unsigned int i;
80
81	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
82		const unsigned int rn = ugid2int(tests[i].r);
83		const unsigned int en = ugid2int(tests[i].e);
84		const unsigned int sn = ugid2int(tests[i].s);
85
86		if (!num_matches_id(rn, ugid) ||
87		    !num_matches_id(en, ugid) ||
88		    !num_matches_id(sn, ugid))
89			continue;
90
91		if (syscall(SYSCALL_NR, tests[i].r, tests[i].e, tests[i].s)) {
92			if (!i && ENOSYS == errno) {
93				printf("%s(%u, %u, %u) = -1 ENOSYS (%m)\n",
94				       SYSCALL_NAME, ugid, ugid, ugid);
95				break;
96			}
97			perror_msg_and_fail("%s(%#lx, %#lx, %#lx)",
98					    SYSCALL_NAME,
99					    tests[i].r, tests[i].e, tests[i].s);
100		}
101
102		printf("%s(", SYSCALL_NAME);
103		print_int(rn);
104		printf(", ");
105		print_int(en);
106		printf(", ");
107		print_int(sn);
108		printf(") = 0\n");
109	}
110
111	puts("+++ exited with 0 +++");
112	return 0;
113}
114