1// SPDX-License-Identifier: GPL-2.0
2#include <cap-ng.h>
3#include <linux/capability.h>
4#include <stdbool.h>
5#include <string.h>
6#include <stdio.h>
7#include <sys/prctl.h>
8#include <sys/auxv.h>
9
10#include "../kselftest.h"
11
12#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19)
13# define HAVE_GETAUXVAL
14#endif
15
16static bool bool_arg(char **argv, int i)
17{
18	if (!strcmp(argv[i], "0"))
19		return false;
20	else if (!strcmp(argv[i], "1"))
21		return true;
22	else {
23		ksft_exit_fail_msg("wrong argv[%d]\n", i);
24		return false;
25	}
26}
27
28int main(int argc, char **argv)
29{
30	const char *atsec = "";
31
32	/*
33	 * Be careful just in case a setgid or setcapped copy of this
34	 * helper gets out.
35	 */
36
37	if (argc != 5)
38		ksft_exit_fail_msg("wrong argc\n");
39
40#ifdef HAVE_GETAUXVAL
41	if (getauxval(AT_SECURE))
42		atsec = " (AT_SECURE is set)";
43	else
44		atsec = " (AT_SECURE is not set)";
45#endif
46
47	capng_get_caps_process();
48
49	if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {
50		ksft_print_msg("Wrong effective state%s\n", atsec);
51		return 1;
52	}
53
54	if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {
55		ksft_print_msg("Wrong permitted state%s\n", atsec);
56		return 1;
57	}
58
59	if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {
60		ksft_print_msg("Wrong inheritable state%s\n", atsec);
61		return 1;
62	}
63
64	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {
65		ksft_print_msg("Wrong ambient state%s\n", atsec);
66		return 1;
67	}
68
69	ksft_print_msg("%s: Capabilities after execve were correct\n",
70			"validate_cap:");
71	return 0;
72}
73