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
34 static int
ugid2int(const unsigned UGID_TYPE ugid)35 ugid2int(const unsigned UGID_TYPE ugid)
36 {
37 if ((unsigned UGID_TYPE) -1U == ugid)
38 return -1;
39 else
40 return ugid;
41 }
42
43 static void
print_int(const unsigned int num)44 print_int(const unsigned int num)
45 {
46 if (num == -1U)
47 printf("-1");
48 else
49 printf("%u", num);
50 }
51
52 static int
num_matches_id(const unsigned int num,const unsigned int ugid)53 num_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
61 int
main(void)62 main(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