Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <cap-ng.h>
2#include <linux/capability.h>
3#include <stdbool.h>
4#include <string.h>
5#include <stdio.h>
6#include <sys/prctl.h>
7#include <sys/auxv.h>
8
9#include "../kselftest.h"
10
11#ifndef PR_CAP_AMBIENT
12#define PR_CAP_AMBIENT 47
13# define PR_CAP_AMBIENT_IS_SET 1
14# define PR_CAP_AMBIENT_RAISE 2
15# define PR_CAP_AMBIENT_LOWER 3
16# define PR_CAP_AMBIENT_CLEAR_ALL 4
17#endif
18
19#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19)
20# define HAVE_GETAUXVAL
21#endif
22
23static bool bool_arg(char **argv, int i)
24{
25 if (!strcmp(argv[i], "0"))
26 return false;
27 else if (!strcmp(argv[i], "1"))
28 return true;
29 else {
30 ksft_exit_fail_msg("wrong argv[%d]\n", i);
31 return false;
32 }
33}
34
35int main(int argc, char **argv)
36{
37 const char *atsec = "";
38
39 /*
40 * Be careful just in case a setgid or setcapped copy of this
41 * helper gets out.
42 */
43
44 if (argc != 5)
45 ksft_exit_fail_msg("wrong argc\n");
46
47#ifdef HAVE_GETAUXVAL
48 if (getauxval(AT_SECURE))
49 atsec = " (AT_SECURE is set)";
50 else
51 atsec = " (AT_SECURE is not set)";
52#endif
53
54 capng_get_caps_process();
55
56 if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {
57 ksft_print_msg("Wrong effective state%s\n", atsec);
58 return 1;
59 }
60
61 if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {
62 ksft_print_msg("Wrong permitted state%s\n", atsec);
63 return 1;
64 }
65
66 if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {
67 ksft_print_msg("Wrong inheritable state%s\n", atsec);
68 return 1;
69 }
70
71 if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {
72 ksft_print_msg("Wrong ambient state%s\n", atsec);
73 return 1;
74 }
75
76 ksft_print_msg("%s: Capabilities after execve were correct\n",
77 "validate_cap:");
78 return 0;
79}