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66c3619872
Bumping across one of our scripts with very long trailing whitespaces, I thought it might be a good idea to clean these up. Doing so, some missing or inconsistent licence headers were fixed. There is no need in shipping all these files en bloc, as their functionality won't change. Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
64 lines
2.5 KiB
Bash
64 lines
2.5 KiB
Bash
#!/bin/sh
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###############################################################################
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# #
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# IPFire.org - A linux based firewall #
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# Copyright (C) 2007-2022 IPFire Team <info@ipfire.org> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <http://www.gnu.org/licenses/>. #
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# #
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###############################################################################
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. /etc/sysconfig/rc
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. ${rc_functions}
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eval $(/usr/local/bin/readhash /var/ipfire/main/security)
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case "${1}" in
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start)
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# Nothing to do here when SMT is forced on
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if [ "${ENABLE_SMT}" = "on" ]; then
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exit 0
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fi
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# Nothing to do when SMT is not enabled or not supported anyways
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if [ "$(</sys/devices/system/cpu/smt/control)" != "on" ]; then
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exit 0
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fi 2>/dev/null
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# Do not disable SMT inside virtual machines
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if running_on_hypervisor; then
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exit 0
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fi
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# Disable SMT when the processor is vulnerable to Foreshadow or Fallout/ZombieLoad/RIDL
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for vuln in l1tf mds; do
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if [ -r "/sys/devices/system/cpu/vulnerabilities/${vuln}" ] && \
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[[ "$(</sys/devices/system/cpu/vulnerabilities/${vuln})" =~ "SMT vulnerable" ]]; then
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# Disable SMT
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boot_mesg "Disabling Simultaneous Multi-Threading (SMT)..."
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echo "forceoff" > /sys/devices/system/cpu/smt/control
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echo_ok
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# No need to check any further when we have disabled SMT already
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break
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fi
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done
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;;
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*)
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echo "Usage: ${0} {start}"
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exit 1
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;;
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esac
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