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set kernel boot parameter l1tf=full,force and nosmt=force

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https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
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Patrick Schleizer 2020-01-30 00:46:48 -05:00
parent efc40da4fb
commit c1a0da60be
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2
debian/control vendored
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@ -70,6 +70,8 @@ Description: enhances misc security settings
vulnerabilities.
.
* All mitigations for the MDS vulnerability are enabled.
.
* Enables mitigations for the L1TF (L1 Terminal Fault) vulnerability.
.
* A systemd service clears System.map on boot as these contain kernel symbols
that could be useful to an attacker.

6
etc/default/grub.d/40_kernel_hardening.cfg
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@ -40,6 +40,12 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX pti=on"
## Disables smt which can be used to exploit the MDS vulnerability.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1tf=full,force"
## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX nosmt=force"
## Vsyscalls are obsolete, are at fixed addresses and are a target for ROP.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vsyscall=none"