1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause 5# 6# Copyright (c) 2019 Dell EMC Isilon 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# Simple test of kpti (Kernel page-table isolation) enable / disable 31 32# Page fault seen: https://people.freebsd.org/~pho/stress/log/dougm061.txt 33# Fixed by r354132 34 35[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 36proccontrol -m kpti -q 2> /dev/null || exit 0 37[ `sysctl -n vm.pmap.pti` -eq 1 ] && echo "Page Table Isolation enabled" || 38 echo "Page Table Isolation disabled" 39 40prog=date 41[ $# -eq 1 ] && prog=$1 42start=`date +%s` 43while [ $((`date +%s` - start)) -lt 120 ]; do 44 for i in `jot 50`; do 45 proccontrol -m kpti -s disable $prog & 46 proccontrol -m kpti -s enable $prog & 47 done > /dev/null 48 wait 49done 50exit 0 51