LXR linux/tools/testing/selftests/capabilities/validate

   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#ifndef PR_CAP_AMBIENT
  13#define PR_CAP_AMBIENT                  47
  14# define PR_CAP_AMBIENT_IS_SET          1
  15# define PR_CAP_AMBIENT_RAISE           2
  16# define PR_CAP_AMBIENT_LOWER           3
  17# define PR_CAP_AMBIENT_CLEAR_ALL       4
  18#endif
  19
  20#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19)
  21# define HAVE_GETAUXVAL
  22#endif
  23
  24static bool bool_arg(char **argv, int i)
  25{
  26        if (!strcmp(argv[i], "0"))
  27                return false;
  28        else if (!strcmp(argv[i], "1"))
  29                return true;
  30        else {
  31                ksft_exit_fail_msg("wrong argv[%d]\n", i);
  32                return false;
  33        }
  34}
  35
  36int main(int argc, char **argv)
  37{
  38        const char *atsec = "";
  39
  40        /*
  41         * Be careful just in case a setgid or setcapped copy of this
  42         * helper gets out.
  43         */
  44
  45        if (argc != 5)
  46                ksft_exit_fail_msg("wrong argc\n");
  47
  48#ifdef HAVE_GETAUXVAL
  49        if (getauxval(AT_SECURE))
  50                atsec = " (AT_SECURE is set)";
  51        else
  52                atsec = " (AT_SECURE is not set)";
  53#endif
  54
  55        capng_get_caps_process();
  56
  57        if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {
  58                ksft_print_msg("Wrong effective state%s\n", atsec);
  59                return 1;
  60        }
  61
  62        if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {
  63                ksft_print_msg("Wrong permitted state%s\n", atsec);
  64                return 1;
  65        }
  66
  67        if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {
  68                ksft_print_msg("Wrong inheritable state%s\n", atsec);
  69                return 1;
  70        }
  71
  72        if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {
  73                ksft_print_msg("Wrong ambient state%s\n", atsec);
  74                return 1;
  75        }
  76
  77        ksft_print_msg("%s: Capabilities after execve were correct\n",
  78                        "validate_cap:");
  79        return 0;
  80}
  81