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1 | #!/bin/sh | |
2 | ############################################################################### | |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5 | # Copyright (C) 2007-2023 IPFire Team <info@ipfire.org> # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | . /etc/sysconfig/rc | |
23 | . ${rc_functions} | |
24 | ||
25 | eval $(/usr/local/bin/readhash /var/ipfire/main/security) | |
26 | ||
27 | case "${1}" in | |
28 | start) | |
29 | # Nothing to do here when SMT is forced on | |
30 | if [ "${ENABLE_SMT}" = "on" ]; then | |
31 | exit 0 | |
32 | fi | |
33 | ||
34 | # Nothing to do when SMT is not enabled or not supported anyways | |
35 | if [ "$(</sys/devices/system/cpu/smt/control)" != "on" ]; then | |
36 | exit 0 | |
37 | fi 2>/dev/null | |
38 | ||
39 | # Do not disable SMT inside virtual machines | |
40 | if running_on_hypervisor; then | |
41 | exit 0 | |
42 | fi | |
43 | ||
44 | # Disable SMT when the processor is vulnerable if SMT is enabled | |
45 | for vuln in $(ls /sys/devices/system/cpu/vulnerabilities/*) ; do | |
46 | if [ -r "${vuln}" ] && \ | |
47 | [[ "$(<${vuln})" =~ "SMT vulnerable" ]]; then | |
48 | # Disable SMT | |
49 | boot_mesg "Disabling Simultaneous Multi-Threading (SMT)..." | |
50 | echo "forceoff" > /sys/devices/system/cpu/smt/control | |
51 | echo_ok | |
52 | ||
53 | # No need to check any further when we have disabled SMT already | |
54 | break | |
55 | fi | |
56 | done | |
57 | ;; | |
58 | ||
59 | *) | |
60 | echo "Usage: ${0} {start}" | |
61 | exit 1 | |
62 | ;; | |
63 | esac |