1d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes/*
2d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Check decoding of setreuid/setregid/setreuid32/setregid32 syscalls.
3d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes *
4d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * All rights reserved.
6d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes *
7d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Redistribution and use in source and binary forms, with or without
8d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * modification, are permitted provided that the following conditions
9d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * are met:
10d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 1. Redistributions of source code must retain the above copyright
11d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes *    notice, this list of conditions and the following disclaimer.
12d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 2. Redistributions in binary form must reproduce the above copyright
13d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes *    notice, this list of conditions and the following disclaimer in the
14d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes *    documentation and/or other materials provided with the distribution.
15d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 3. The name of the author may not be used to endorse or promote products
16d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes *    derived from this software without specific prior written permission.
17d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes *
18d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes */
29d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
30d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <errno.h>
31d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <stdio.h>
32d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <unistd.h>
33d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
34d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesstatic int
35d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesugid2int(const unsigned UGID_TYPE ugid)
36d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{
37d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	if ((unsigned UGID_TYPE) -1U == ugid)
38d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		return -1;
39d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	else
40d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		return ugid;
41d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes}
42d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
43d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesstatic void
44d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesprint_int(const unsigned int num)
45d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{
46d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	if (num == -1U)
47d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		printf("-1");
48d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	else
49d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		printf("%u", num);
50d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes}
51d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
52d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesstatic int
53d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesnum_matches_id(const unsigned int num, const unsigned int ugid)
54d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{
55d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	return num == ugid || num == -1U;
56d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes}
57d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
58d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#define PAIR(val)	{ val, ugid }, { ugid, val }
59d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
60d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesint
61d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesmain(void)
62d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{
63d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	unsigned int ugid = GETUGID;
64d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	CHECK_OVERFLOWUGID(ugid);
65d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
66d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	const struct {
67d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		const long r, e;
68d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	} tests[] = {
69d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		{ ugid, ugid },
70d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		PAIR((unsigned long) 0xffffffff00000000ULL | ugid),
71d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		PAIR(-1U),
72d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		PAIR(-1L),
73d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		PAIR(0xffff0000U | ugid),
74d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		PAIR(0xffff),
75d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		PAIR(0xc0deffffU)
76d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	};
77d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
78d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	unsigned int i;
79d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
80d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
81d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		const unsigned int rn = ugid2int(tests[i].r);
82d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		const unsigned int en = ugid2int(tests[i].e);
83d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
84d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		if (!num_matches_id(rn, ugid) || !num_matches_id(en, ugid))
85d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes			continue;
86d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
87d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		if (syscall(SYSCALL_NR, tests[i].r, tests[i].e)) {
88d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes			if (!i && ENOSYS == errno) {
89d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes				printf("%s(%u, %u) = -1 ENOSYS (%m)\n",
90d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes				       SYSCALL_NAME, ugid, ugid);
91d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes				break;
92d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes			}
93d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes			perror_msg_and_fail("%s(%#lx, %#lx)", SYSCALL_NAME,
94d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes					    tests[i].r, tests[i].e);
95d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		}
96d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
97d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		printf("%s(", SYSCALL_NAME);
98d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		print_int(rn);
99d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		printf(", ");
100d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		print_int(en);
101d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes		printf(") = 0\n");
102d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	}
103d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes
104d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	puts("+++ exited with 0 +++");
105d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes	return 0;
106d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes}
107