1 /*
2  * Check decoding of setfsuid/setfsgid/setfsuid32/setfsgid32 syscalls.
3  *
4  * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5  * Copyright (c) 2016-2017 The strace developers.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. The name of the author may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include <stdio.h>
32 #include <unistd.h>
33 
34 void
35 printuid(unsigned UGID_TYPE id)
36 {
37 	if (id == (unsigned UGID_TYPE) -1U)
38 		printf("-1");
39 	else
40 		printf("%u", id);
41 }
42 
43 int
44 main(void)
45 {
46 	unsigned int ugid = GETUGID;
47 
48 	const kernel_ulong_t tests[] = {
49 		ugid,
50 		0xffff0000U | ugid,
51 		F8ILL_KULONG_MASK | ugid,
52 		0xffffU,
53 		-1U,
54 		-1L,
55 		0xc0deffffU,
56 		0xfacefeedU,
57 		(long) 0xfacefeeddeadbeefULL
58 	};
59 
60 	unsigned int i;
61 
62 	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
63 		const unsigned int num = (unsigned UGID_TYPE) tests[i];
64 		unsigned int rc;
65 
66 		rc = syscall(SYSCALL_NR, tests[i]);
67 		printf("%s(", SYSCALL_NAME);
68 		printuid(num);
69 		printf(") = %u\n", rc);
70 
71 		rc = syscall(SYSCALL_NR, ugid);
72 		printf("%s(%u) = %u\n", SYSCALL_NAME, ugid, rc);
73 	}
74 
75 	puts("+++ exited with 0 +++");
76 	return 0;
77 }
78