1 /*
2 * Check how seccomp SECCOMP_SET_MODE_STRICT is decoded.
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 "tests.h"
31 #include <asm/unistd.h>
32
33 #if defined __NR_seccomp && defined __NR_exit
34
35 # include <stdio.h>
36 # include <unistd.h>
37
38 int
main(void)39 main(void)
40 {
41 static const char text1[] =
42 "seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL) = 0\n";
43 static const char text2[] = "+++ exited with 0 +++\n";
44 const kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL;
45 long rc;
46
47 rc = syscall(__NR_seccomp, -1L, -1L, addr);
48 printf("seccomp(%#x /* SECCOMP_SET_MODE_??? */, %u, %#llx)"
49 " = %s\n", -1, -1, (unsigned long long) addr, sprintrc(rc));
50 fflush(stdout);
51
52 rc = syscall(__NR_seccomp, 0, 0, 0);
53 if (rc) {
54 printf("seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL) = %s\n",
55 sprintrc(rc));
56 fflush(stdout);
57 rc = 0;
58 } else {
59 /*
60 * If kernel implementaton of SECCOMP_MODE_STRICT is buggy,
61 * the following syscall will result to SIGKILL.
62 */
63 rc = write(1, text1, LENGTH_OF(text1)) != LENGTH_OF(text1);
64 }
65
66 rc += write(1, text2, LENGTH_OF(text2)) != LENGTH_OF(text2);
67 return !!syscall(__NR_exit, rc);
68 }
69
70 #else
71
72 SKIP_MAIN_UNDEFINED("__NR_seccomp && __NR_exit")
73
74 #endif
75