selftests/timers: Add set-2038 test from timetest suite

Adds the set-2038 test which sets the time to near-edge cases
like the start and end of the 32 bit epoch and checks that
time behaves properly. There is also a dangerous mode, which
lets the clock roll over past 2038 on 32bit systems, which
on some older kernels will cause system hangs.

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
John Stultz 2015-03-11 17:40:14 -07:00 committed by Shuah Khan
parent 3a92a15fba
commit 0d02a753a5
2 changed files with 146 additions and 1 deletions

View File

@ -5,7 +5,7 @@ LDFLAGS += -lrt -lpthread
bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \
set-timer-lat threadtest mqueue-lat valid-adjtimex \
alarmtimer-suspend change_skew skew_consistency clocksource-switch \
leap-a-day leapcrash set-tai
leap-a-day leapcrash set-tai set-2038
all: ${bins}
@ -33,6 +33,7 @@ run_destructive_tests: run_tests
./leap-a-day -s -i 10
./leapcrash
./set-tai
./set-2038
clean:
rm -f ${bins}

View File

@ -0,0 +1,144 @@
/* Time bounds setting test
* by: john stultz (johnstul@us.ibm.com)
* (C) Copyright IBM 2012
* Licensed under the GPLv2
*
* NOTE: This is a meta-test which sets the time to edge cases then
* uses other tests to detect problems. Thus this test requires that
* the inconsistency-check and nanosleep tests be present in the same
* directory it is run from.
*
* To build:
* $ gcc set-2038.c -o set-2038 -lrt
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#ifdef KTEST
#include "../kselftest.h"
#else
static inline int ksft_exit_pass(void)
{
exit(0);
}
static inline int ksft_exit_fail(void)
{
exit(1);
}
#endif
#define NSEC_PER_SEC 1000000000LL
#define KTIME_MAX ((long long)~((unsigned long long)1 << 63))
#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
#define YEAR_1901 (-0x7fffffffL)
#define YEAR_1970 1
#define YEAR_2038 0x7fffffffL /*overflows 32bit time_t */
#define YEAR_2262 KTIME_SEC_MAX /*overflows 64bit ktime_t */
#define YEAR_MAX ((long long)((1ULL<<63)-1)) /*overflows 64bit time_t */
int is32bits(void)
{
return (sizeof(long) == 4);
}
int settime(long long time)
{
struct timeval now;
int ret;
now.tv_sec = (time_t)time;
now.tv_usec = 0;
ret = settimeofday(&now, NULL);
printf("Setting time to 0x%lx: %d\n", (long)time, ret);
return ret;
}
int do_tests(void)
{
int ret;
ret = system("date");
ret = system("./inconsistency-check -c 0 -t 20");
ret |= system("./nanosleep");
ret |= system("./nsleep-lat");
return ret;
}
int main(int argc, char *argv[])
{
int ret = 0;
int opt, dangerous = 0;
time_t start;
/* Process arguments */
while ((opt = getopt(argc, argv, "d")) != -1) {
switch (opt) {
case 'd':
dangerous = 1;
}
}
start = time(0);
/* First test that crazy values don't work */
if (!settime(YEAR_1901)) {
ret = -1;
goto out;
}
if (!settime(YEAR_MAX)) {
ret = -1;
goto out;
}
if (!is32bits() && !settime(YEAR_2262)) {
ret = -1;
goto out;
}
/* Now test behavior near edges */
settime(YEAR_1970);
ret = do_tests();
if (ret)
goto out;
settime(YEAR_2038 - 600);
ret = do_tests();
if (ret)
goto out;
/* The rest of the tests can blowup on 32bit systems */
if (is32bits() && !dangerous)
goto out;
/* Test rollover behavior 32bit edge */
settime(YEAR_2038 - 10);
ret = do_tests();
if (ret)
goto out;
settime(YEAR_2262 - 600);
ret = do_tests();
out:
/* restore clock */
settime(start);
if (ret)
return ksft_exit_fail();
return ksft_exit_pass();
}