Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 <time.h>
15#include <string.h>
16
17#include "log.h"
18#include "timens.h"
19
20#define OFFSET (36000)
21
22int main(int argc, char *argv[])
23{
24 struct timespec now, tst;
25 int status, i;
26 pid_t pid;
27
28 if (argc > 1) {
29 if (sscanf(argv[1], "%ld", &now.tv_sec) != 1)
30 return pr_perror("sscanf");
31
32 for (i = 0; i < 2; i++) {
33 _gettime(CLOCK_MONOTONIC, &tst, i);
34 if (abs(tst.tv_sec - now.tv_sec) > 5)
35 return pr_fail("%ld %ld\n", now.tv_sec, tst.tv_sec);
36 }
37 return 0;
38 }
39
40 nscheck();
41
42 ksft_set_plan(1);
43
44 clock_gettime(CLOCK_MONOTONIC, &now);
45
46 if (unshare_timens())
47 return 1;
48
49 if (_settime(CLOCK_MONOTONIC, OFFSET))
50 return 1;
51
52 for (i = 0; i < 2; i++) {
53 _gettime(CLOCK_MONOTONIC, &tst, i);
54 if (abs(tst.tv_sec - now.tv_sec) > 5)
55 return pr_fail("%ld %ld\n",
56 now.tv_sec, tst.tv_sec);
57 }
58
59 if (argc > 1)
60 return 0;
61
62 pid = fork();
63 if (pid < 0)
64 return pr_perror("fork");
65
66 if (pid == 0) {
67 char now_str[64];
68 char *cargv[] = {"exec", now_str, NULL};
69 char *cenv[] = {NULL};
70
71 /* Check that a child process is in the new timens. */
72 for (i = 0; i < 2; i++) {
73 _gettime(CLOCK_MONOTONIC, &tst, i);
74 if (abs(tst.tv_sec - now.tv_sec - OFFSET) > 5)
75 return pr_fail("%ld %ld\n",
76 now.tv_sec + OFFSET, tst.tv_sec);
77 }
78
79 /* Check for proper vvar offsets after execve. */
80 snprintf(now_str, sizeof(now_str), "%ld", now.tv_sec + OFFSET);
81 execve("/proc/self/exe", cargv, cenv);
82 return pr_perror("execve");
83 }
84
85 if (waitpid(pid, &status, 0) != pid)
86 return pr_perror("waitpid");
87
88 if (status)
89 ksft_exit_fail();
90
91 ksft_test_result_pass("exec\n");
92 ksft_exit_pass();
93 return 0;
94}