LXR linux/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
  21int 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 (abs(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 (abs(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 (abs(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}
  94