text: // SPDX-License-Identifier: GPL-2.0
  #include <cap-ng.h>
  #include <linux/capability.h>
  #include <stdbool.h>
  #include <string.h>
  #include <stdio.h>
  #include <sys/prctl.h>
  #include <sys/auxv.h>
  
  #include "../kselftest.h"
  
  #ifndef PR_CAP_AMBIENT
  #define PR_CAP_AMBIENT			47
  # define PR_CAP_AMBIENT_IS_SET		1
  # define PR_CAP_AMBIENT_RAISE		2
  # define PR_CAP_AMBIENT_LOWER		3
  # define PR_CAP_AMBIENT_CLEAR_ALL	4
  #endif
  
  #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19)
  # define HAVE_GETAUXVAL
  #endif
  
  static bool bool_arg(char **argv, int i)
  {
  	if (!strcmp(argv[i], "0"))
  		return false;
  	else if (!strcmp(argv[i], "1"))
  		return true;
  	else {
  		ksft_exit_fail_msg("wrong argv[%d]\n", i);
  		return false;
  	}
  }
  
  int main(int argc, char **argv)
  {
  	const char *atsec = "";
  
  	/*
  	 * Be careful just in case a setgid or setcapped copy of this
  	 * helper gets out.
  	 */
  
  	if (argc != 5)
  		ksft_exit_fail_msg("wrong argc\n");
  
  #ifdef HAVE_GETAUXVAL
  	if (getauxval(AT_SECURE))
  		atsec = " (AT_SECURE is set)";
  	else
  		atsec = " (AT_SECURE is not set)";
  #endif
  
  	capng_get_caps_process();
  
  	if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {
  		ksft_print_msg("Wrong effective state%s\n", atsec);
  		return 1;
  	}
  
  	if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {
  		ksft_print_msg("Wrong permitted state%s\n", atsec);
  		return 1;
  	}
  
  	if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {
  		ksft_print_msg("Wrong inheritable state%s\n", atsec);
  		return 1;
  	}
  
  	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {
  		ksft_print_msg("Wrong ambient state%s\n", atsec);
  		return 1;
  	}
  
  	ksft_print_msg("%s: Capabilities after execve were correct\n",
  			"validate_cap:");
  	return 0;
  }
  