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