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shuffle and rewording

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Raja Grewal 2022-07-19 02:29:46 +10:00
parent 39314b2912
commit 73f1e23332
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1 changed files with 20 additions and 19 deletions
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39
etc/default/grub.d/40_cpu_mitigations.cfg
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@ -1,11 +1,17 @@
## Copyright (C) 2019 - 2022 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## See the file COPYING for copying conditions.
## Enables all mitigations for CPU vulnerabilities.
## Enables all known mitigations for CPU vulnerabilities.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/index.html
## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647
## Enable all mitigations for Spectre Variant 2.
## Force disable SMT as it has caused numerous CPU vulnerabilities.
##
## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX nosmt=force"
## Enable mitigations for Spectre variant 2 (indirect branch speculation).
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/spectre.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spectre_v2=on"
@ -13,30 +19,25 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spectre_v2=on"
## Disable Speculative Store Bypass.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spec_store_bypass_disable=on"
## Disable TSX, enable all mitigations for the TSX Async Abort
## vulnerability and disable SMT.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx=off tsx_async_abort=full,nosmt"
## Enable all mitigations for the MDS vulnerability and disable
## SMT.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"
## Enable all mitigations for the L1TF vulnerability and disable SMT
## Enable mitigations for the L1TF vulnerability through disabling SMT
## and L1D flush runtime control.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1tf=full,force"
## Force disable SMT as it has caused numerous CPU vulnerabilities.
## Enable mitigations for the MDS vulnerability through clearing buffer cache
## and disabling SMT.
##
## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX nosmt=force"
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"
## Patches the TAA vulnerability by disabling TSX and enables mitigations using
## TSX Async Abort along with disabling SMT.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx=off tsx_async_abort=full,nosmt"
## Mark all huge pages in the EPT as non-executable to mitigate iTLB multihit.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/multihit.html#mitigation-control-on-the-kernel-command-line-and-kvm-module-parameter
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/multihit.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"