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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <sched.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "log.h"
#include "timens.h"
/*
* Test shouldn't be run for a day, so add 10 days to child
* time and check parent's time to be in the same day.
*/
#define MAX_TEST_TIME_SEC (60*5)
#define DAY_IN_SEC (60*60*24)
#define TEN_DAYS_IN_SEC (10*DAY_IN_SEC)
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
static int child_ns, parent_ns;
static int switch_ns(int fd)
{
if (setns(fd, CLONE_NEWTIME))
return pr_perror("setns()");
return 0;
}
static int init_namespaces(void)
{
char path[] = "/proc/self/ns/time_for_children";
struct stat st1, st2;
parent_ns = open(path, O_RDONLY);
if (parent_ns <= 0)
return pr_perror("Unable to open %s", path);
if (fstat(parent_ns, &st1))
return pr_perror("Unable to stat the parent timens");
if (unshare_timens())
return -1;
child_ns = open(path, O_RDONLY);
if (child_ns <= 0)
return pr_perror("Unable to open %s", path);
if (fstat(child_ns, &st2))
return pr_perror("Unable to stat the timens");
if (st1.st_ino == st2.st_ino)
return pr_err("The same child_ns after CLONE_NEWTIME");
if (_settime(CLOCK_BOOTTIME, TEN_DAYS_IN_SEC))
return -1;
return 0;
}
static int read_proc_uptime(struct timespec *uptime)
{
unsigned long up_sec, up_nsec;
FILE *proc;
proc = fopen("/proc/uptime", "r");
if (proc == NULL) {
pr_perror("Unable to open /proc/uptime");
return -1;
}
if (fscanf(proc, "%lu.%02lu", &up_sec, &up_nsec) != 2) {
if (errno) {
pr_perror("fscanf");
return -errno;
}
pr_err("failed to parse /proc/uptime");
return -1;
}
fclose(proc);
uptime->tv_sec = up_sec;
uptime->tv_nsec = up_nsec;
return 0;
}
static int read_proc_stat_btime(unsigned long long *boottime_sec)
{
FILE *proc;
char line_buf[2048];
proc = fopen("/proc/stat", "r");
if (proc == NULL) {
pr_perror("Unable to open /proc/stat");
return -1;
}
while (fgets(line_buf, 2048, proc)) {
if (sscanf(line_buf, "btime %llu", boottime_sec) != 1)
continue;
fclose(proc);
return 0;
}
if (errno) {
pr_perror("fscanf");
fclose(proc);
return -errno;
}
pr_err("failed to parse /proc/stat");
fclose(proc);
return -1;
}
static int check_uptime(void)
{
struct timespec uptime_new, uptime_old;
time_t uptime_expected;
double prec = MAX_TEST_TIME_SEC;
if (switch_ns(parent_ns))
return pr_err("switch_ns(%d)", parent_ns);
if (read_proc_uptime(&uptime_old))
return 1;
if (switch_ns(child_ns))
return pr_err("switch_ns(%d)", child_ns);
if (read_proc_uptime(&uptime_new))
return 1;
uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC;
if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) {
pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]",
uptime_old.tv_sec, uptime_new.tv_sec,
uptime_old.tv_sec + TEN_DAYS_IN_SEC);
return 1;
}
ksft_test_result_pass("Passed for /proc/uptime\n");
return 0;
}
static int check_stat_btime(void)
{
unsigned long long btime_new, btime_old;
unsigned long long btime_expected;
if (switch_ns(parent_ns))
return pr_err("switch_ns(%d)", parent_ns);
if (read_proc_stat_btime(&btime_old))
return 1;
if (switch_ns(child_ns))
return pr_err("switch_ns(%d)", child_ns);
if (read_proc_stat_btime(&btime_new))
return 1;
btime_expected = btime_old - TEN_DAYS_IN_SEC;
if (btime_new != btime_expected) {
pr_fail("btime in /proc/stat: old %llu, new %llu [%llu]",
btime_old, btime_new, btime_expected);
return 1;
}
ksft_test_result_pass("Passed for /proc/stat btime\n");
return 0;
}
int main(int argc, char *argv[])
{
int ret = 0;
nscheck();
ksft_set_plan(2);
if (init_namespaces())
return 1;
ret |= check_uptime();
ret |= check_stat_btime();
if (ret)
ksft_exit_fail();
ksft_exit_pass();
return ret;
}
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