cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

set-2038.c (2925B)

      1/* Time bounds setting test
      2 *		by: john stultz (johnstul@us.ibm.com)
      3 *		(C) Copyright IBM 2012
      4 *		Licensed under the GPLv2
      5 *
      6 *  NOTE: This is a meta-test which sets the time to edge cases then
      7 *  uses other tests to detect problems. Thus this test requires that
      8 *  the inconsistency-check and nanosleep tests be present in the same
      9 *  directory it is run from.
     10 *
     11 *  To build:
     12 *	$ gcc set-2038.c -o set-2038 -lrt
     13 *
     14 *   This program is free software: you can redistribute it and/or modify
     15 *   it under the terms of the GNU General Public License as published by
     16 *   the Free Software Foundation, either version 2 of the License, or
     17 *   (at your option) any later version.
     18 *
     19 *   This program is distributed in the hope that it will be useful,
     20 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
     21 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     22 *   GNU General Public License for more details.
     23 */
     24
     25#include <stdio.h>
     26#include <stdlib.h>
     27#include <unistd.h>
     28#include <time.h>
     29#include <sys/time.h>
     30#include "../kselftest.h"
     31
     32#define NSEC_PER_SEC 1000000000LL
     33
     34#define KTIME_MAX	((long long)~((unsigned long long)1 << 63))
     35#define KTIME_SEC_MAX	(KTIME_MAX / NSEC_PER_SEC)
     36
     37#define YEAR_1901 (-0x7fffffffL)
     38#define YEAR_1970 1
     39#define YEAR_2038 0x7fffffffL			/*overflows 32bit time_t */
     40#define YEAR_2262 KTIME_SEC_MAX			/*overflows 64bit ktime_t */
     41#define YEAR_MAX  ((long long)((1ULL<<63)-1))	/*overflows 64bit time_t */
     42
     43int is32bits(void)
     44{
     45	return (sizeof(long) == 4);
     46}
     47
     48int settime(long long time)
     49{
     50	struct timeval now;
     51	int ret;
     52
     53	now.tv_sec = (time_t)time;
     54	now.tv_usec  = 0;
     55
     56	ret = settimeofday(&now, NULL);
     57
     58	printf("Setting time to 0x%lx: %d\n", (long)time, ret);
     59	return ret;
     60}
     61
     62int do_tests(void)
     63{
     64	int ret;
     65
     66	ret = system("date");
     67	ret = system("./inconsistency-check -c 0 -t 20");
     68	ret |= system("./nanosleep");
     69	ret |= system("./nsleep-lat");
     70	return ret;
     71
     72}
     73
     74int main(int argc, char *argv[])
     75{
     76	int ret = 0;
     77	int opt, dangerous = 0;
     78	time_t start;
     79
     80	/* Process arguments */
     81	while ((opt = getopt(argc, argv, "d")) != -1) {
     82		switch (opt) {
     83		case 'd':
     84			dangerous = 1;
     85		}
     86	}
     87
     88	start = time(0);
     89
     90	/* First test that crazy values don't work */
     91	if (!settime(YEAR_1901)) {
     92		ret = -1;
     93		goto out;
     94	}
     95	if (!settime(YEAR_MAX)) {
     96		ret = -1;
     97		goto out;
     98	}
     99	if (!is32bits() && !settime(YEAR_2262)) {
    100		ret = -1;
    101		goto out;
    102	}
    103
    104	/* Now test behavior near edges */
    105	settime(YEAR_1970);
    106	ret = do_tests();
    107	if (ret)
    108		goto out;
    109
    110	settime(YEAR_2038 - 600);
    111	ret = do_tests();
    112	if (ret)
    113		goto out;
    114
    115	/* The rest of the tests can blowup on 32bit systems */
    116	if (is32bits() && !dangerous)
    117		goto out;
    118	/* Test rollover behavior 32bit edge */
    119	settime(YEAR_2038 - 10);
    120	ret = do_tests();
    121	if (ret)
    122		goto out;
    123
    124	settime(YEAR_2262 - 600);
    125	ret = do_tests();
    126
    127out:
    128	/* restore clock */
    129	settime(start);
    130	if (ret)
    131		return ksft_exit_fail();
    132	return ksft_exit_pass();
    133}