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(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(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, i: 1)) {
50 ksft_print_msg(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, i: 2)) {
55 ksft_print_msg(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, i: 3)) {
60 ksft_print_msg(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, i: 4)) {
65 ksft_print_msg(msg: "Wrong ambient state%s\n", atsec);
66 return 1;
67 }
68
69 ksft_print_msg(msg: "%s: Capabilities after execve were correct\n",
70 "validate_cap:");
71 return 0;
72}
73

source code of linux/tools/testing/selftests/capabilities/validate_cap.c