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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <stdio.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <string.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 DAY_IN_SEC (60*60*24)
#define TEN_DAYS_IN_SEC (10*DAY_IN_SEC)
struct test_clock {
clockid_t id;
char *name;
/*
* off_id is -1 if a clock has own offset, or it contains an index
* which contains a right offset of this clock.
*/
int off_id;
time_t offset;
};
#define ct(clock, off_id) { clock, #clock, off_id }
static struct test_clock clocks[] = {
ct(CLOCK_BOOTTIME, -1),
ct(CLOCK_BOOTTIME_ALARM, 1),
ct(CLOCK_MONOTONIC, -1),
ct(CLOCK_MONOTONIC_COARSE, 1),
ct(CLOCK_MONOTONIC_RAW, 1),
};
#undef ct
static int child_ns, parent_ns = -1;
static int switch_ns(int fd)
{
if (setns(fd, CLONE_NEWTIME)) {
pr_perror("setns()");
return -1;
}
return 0;
}
static int init_namespaces(void)
{
char path[] = "/proc/self/ns/time_for_children";
struct stat st1, st2;
if (parent_ns == -1) {
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_perror("The same child_ns after CLONE_NEWTIME");
return 0;
}
static int test_gettime(clockid_t clock_index, bool raw_syscall, time_t offset)
{
struct timespec child_ts_new, parent_ts_old, cur_ts;
char *entry = raw_syscall ? "syscall" : "vdso";
double precision = 0.0;
if (check_skip(clocks[clock_index].id))
return 0;
switch (clocks[clock_index].id) {
case CLOCK_MONOTONIC_COARSE:
case CLOCK_MONOTONIC_RAW:
precision = -2.0;
break;
}
if (switch_ns(parent_ns))
return pr_err("switch_ns(%d)", child_ns);
if (_gettime(clocks[clock_index].id, &parent_ts_old, raw_syscall))
return -1;
child_ts_new.tv_nsec = parent_ts_old.tv_nsec;
child_ts_new.tv_sec = parent_ts_old.tv_sec + offset;
if (switch_ns(child_ns))
return pr_err("switch_ns(%d)", child_ns);
if (_gettime(clocks[clock_index].id, &cur_ts, raw_syscall))
return -1;
if (difftime(cur_ts.tv_sec, child_ts_new.tv_sec) < precision) {
ksft_test_result_fail(
"Child's %s (%s) time has not changed: %lu -> %lu [%lu]\n",
clocks[clock_index].name, entry, parent_ts_old.tv_sec,
child_ts_new.tv_sec, cur_ts.tv_sec);
return -1;
}
if (switch_ns(parent_ns))
return pr_err("switch_ns(%d)", parent_ns);
if (_gettime(clocks[clock_index].id, &cur_ts, raw_syscall))
return -1;
if (difftime(cur_ts.tv_sec, parent_ts_old.tv_sec) > DAY_IN_SEC) {
ksft_test_result_fail(
"Parent's %s (%s) time has changed: %lu -> %lu [%lu]\n",
clocks[clock_index].name, entry, parent_ts_old.tv_sec,
child_ts_new.tv_sec, cur_ts.tv_sec);
/* Let's play nice and put it closer to original */
clock_settime(clocks[clock_index].id, &cur_ts);
return -1;
}
ksft_test_result_pass("Passed for %s (%s)\n",
clocks[clock_index].name, entry);
return 0;
}
int main(int argc, char *argv[])
{
unsigned int i;
time_t offset;
int ret = 0;
nscheck();
check_supported_timers();
ksft_set_plan(ARRAY_SIZE(clocks) * 2);
if (init_namespaces())
return 1;
/* Offsets have to be set before tasks enter the namespace. */
for (i = 0; i < ARRAY_SIZE(clocks); i++) {
if (clocks[i].off_id != -1)
continue;
offset = TEN_DAYS_IN_SEC + i * 1000;
clocks[i].offset = offset;
if (_settime(clocks[i].id, offset))
return 1;
}
for (i = 0; i < ARRAY_SIZE(clocks); i++) {
if (clocks[i].off_id != -1)
offset = clocks[clocks[i].off_id].offset;
else
offset = clocks[i].offset;
ret |= test_gettime(i, true, offset);
ret |= test_gettime(i, false, offset);
}
if (ret)
ksft_exit_fail();
ksft_exit_pass();
return !!ret;
}
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