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
bool_arg(char ** argv,int i)16 static 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
main(int argc,char ** argv)28 int main(int argc, char **argv)
29 {
30 const char *atsec = "";
31 int ret;
32
33 /*
34 * Be careful just in case a setgid or setcapped copy of this
35 * helper gets out.
36 */
37
38 if (argc != 5)
39 ksft_exit_fail_msg("wrong argc\n");
40
41 #ifdef HAVE_GETAUXVAL
42 if (getauxval(AT_SECURE))
43 atsec = " (AT_SECURE is set)";
44 else
45 atsec = " (AT_SECURE is not set)";
46 #endif
47
48 ret = capng_get_caps_process();
49 if (ret == -1) {
50 ksft_print_msg("capng_get_caps_process failed\n");
51 return 1;
52 }
53
54 if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {
55 ksft_print_msg("Wrong effective state%s\n", atsec);
56 return 1;
57 }
58
59 if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {
60 ksft_print_msg("Wrong permitted state%s\n", atsec);
61 return 1;
62 }
63
64 if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {
65 ksft_print_msg("Wrong inheritable state%s\n", atsec);
66 return 1;
67 }
68
69 if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {
70 ksft_print_msg("Wrong ambient state%s\n", atsec);
71 return 1;
72 }
73
74 ksft_print_msg("%s: Capabilities after execve were correct\n",
75 "validate_cap:");
76 return 0;
77 }
78