tools/testing/selftests/timens/exec.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #define _GNU_SOURCE
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <sched.h>
   6 #include <stdio.h>
   7 #include <stdbool.h>
   8 #include <sys/stat.h>
   9 #include <sys/syscall.h>
  10 #include <sys/types.h>
  11 #include <sys/wait.h>
  12 #include <time.h>
  13 #include <unistd.h>
  14 #include <string.h>
  15
  16 #include "log.h"
  17 #include "timens.h"
  18
  19 #define OFFSET (36000)
  20
  21 int main(int argc, char *argv[])
  22 {
  23         struct timespec now, tst;
  24         int status, i;
  25         pid_t pid;
  26
  27         if (argc > 1) {
  28                 if (sscanf(argv[1], "%ld", &now.tv_sec) != 1)
  29                         return pr_perror("sscanf");
  30
  31                 for (i = 0; i < 2; i++) {
  32                         _gettime(CLOCK_MONOTONIC, &tst, i);
  33                         if (labs(tst.tv_sec - now.tv_sec) > 5)
  34                                 return pr_fail("%ld %ld\n", now.tv_sec, tst.tv_sec);
  35                 }
  36                 return 0;
  37         }
  38
  39         nscheck();
  40
  41         ksft_set_plan(1);
  42
  43         clock_gettime(CLOCK_MONOTONIC, &now);
  44
  45         if (unshare_timens())
  46                 return 1;
  47
  48         if (_settime(CLOCK_MONOTONIC, OFFSET))
  49                 return 1;
  50
  51         for (i = 0; i < 2; i++) {
  52                 _gettime(CLOCK_MONOTONIC, &tst, i);
  53                 if (labs(tst.tv_sec - now.tv_sec) > 5)
  54                         return pr_fail("%ld %ld\n",
  55                                         now.tv_sec, tst.tv_sec);
  56         }
  57
  58         if (argc > 1)
  59                 return 0;
  60
  61         pid = fork();
  62         if (pid < 0)
  63                 return pr_perror("fork");
  64
  65         if (pid == 0) {
  66                 char now_str[64];
  67                 char *cargv[] = {"exec", now_str, NULL};
  68                 char *cenv[] = {NULL};
  69
  70                 /* Check that a child process is in the new timens. */
  71                 for (i = 0; i < 2; i++) {
  72                         _gettime(CLOCK_MONOTONIC, &tst, i);
  73                         if (labs(tst.tv_sec - now.tv_sec - OFFSET) > 5)
  74                                 return pr_fail("%ld %ld\n",
  75                                                 now.tv_sec + OFFSET, tst.tv_sec);
  76                 }
  77
  78                 /* Check for proper vvar offsets after execve. */
  79                 snprintf(now_str, sizeof(now_str), "%ld", now.tv_sec + OFFSET);
  80                 execve("/proc/self/exe", cargv, cenv);
  81                 return pr_perror("execve");
  82         }
  83
  84         if (waitpid(pid, &status, 0) != pid)
  85                 return pr_perror("waitpid");
  86
  87         if (status)
  88                 ksft_exit_fail();
  89
  90         ksft_test_result_pass("exec\n");
  91         ksft_exit_pass();
  92         return 0;
  93 }