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

change_skew.c (2137B)

      1/* ADJ_FREQ Skew change 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 cranks the ADJ_FREQ knob and
      7 *  then uses other tests to detect problems. Thus this test requires
      8 *  that the raw_skew, inconsistency-check and nanosleep tests be
      9 *  present in the same directory it is run from.
     10 *
     11 *  To build:
     12 *	$ gcc change_skew.c -o change_skew -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
     26#include <stdio.h>
     27#include <stdlib.h>
     28#include <sys/time.h>
     29#include <sys/timex.h>
     30#include <time.h>
     31#include "../kselftest.h"
     32
     33#define NSEC_PER_SEC 1000000000LL
     34
     35
     36int change_skew_test(int ppm)
     37{
     38	struct timex tx;
     39	int ret;
     40
     41	tx.modes = ADJ_FREQUENCY;
     42	tx.freq = ppm << 16;
     43
     44	ret = adjtimex(&tx);
     45	if (ret < 0) {
     46		printf("Error adjusting freq\n");
     47		return ret;
     48	}
     49
     50	ret = system("./raw_skew");
     51	ret |= system("./inconsistency-check");
     52	ret |= system("./nanosleep");
     53
     54	return ret;
     55}
     56
     57
     58int main(int argv, char **argc)
     59{
     60	struct timex tx;
     61	int i, ret;
     62
     63	int ppm[5] = {0, 250, 500, -250, -500};
     64
     65	/* Kill ntpd */
     66	ret = system("killall -9 ntpd");
     67
     68	/* Make sure there's no offset adjustment going on */
     69	tx.modes = ADJ_OFFSET;
     70	tx.offset = 0;
     71	ret = adjtimex(&tx);
     72
     73	if (ret < 0) {
     74		printf("Maybe you're not running as root?\n");
     75		return -1;
     76	}
     77
     78	for (i = 0; i < 5; i++) {
     79		printf("Using %i ppm adjustment\n", ppm[i]);
     80		ret = change_skew_test(ppm[i]);
     81		if (ret)
     82			break;
     83	}
     84
     85	/* Set things back */
     86	tx.modes = ADJ_FREQUENCY;
     87	tx.offset = 0;
     88	adjtimex(&tx);
     89
     90	if (ret) {
     91		printf("[FAIL]");
     92		return ksft_exit_fail();
     93	}
     94	printf("[OK]");
     95	return ksft_exit_pass();
     96}