78 lines · c
1// SPDX-License-Identifier: GPL-2.02#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_GETAUXVAL14#endif15 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 int ret;32 33 /*34 * Be careful just in case a setgid or setcapped copy of this35 * helper gets out.36 */37 38 if (argc != 5)39 ksft_exit_fail_msg("wrong argc\n");40 41#ifdef HAVE_GETAUXVAL42 if (getauxval(AT_SECURE))43 atsec = " (AT_SECURE is set)";44 else45 atsec = " (AT_SECURE is not set)";46#endif47 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