2021-03-17 09:45:21 -04:00
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## Copyright (C) 2019 - 2021 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
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2020-02-12 13:42:13 -05:00
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## See the file COPYING for copying conditions.
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## Enables all mitigations for CPU vulnerabilities.
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##
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## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647
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## Enable all mitigations for Spectre Variant 2.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/spectre.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spectre_v2=on"
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## Disable Speculative Store Bypass.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spec_store_bypass_disable=on"
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## Disable TSX, enable all mitigations for the TSX Async Abort
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## vulnerability and disable SMT.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx=off tsx_async_abort=full,nosmt"
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## Enable all mitigations for the MDS vulnerability and disable
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## SMT.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"
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## Enable all mitigations for the L1TF vulnerability and disable SMT
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## and L1D flush runtime control.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1tf=full,force"
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## Force disable SMT as it has caused numerous CPU vulnerabilities.
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##
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## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX nosmt=force"
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## Mark all huge pages in the EPT as non-executable to mitigate iTLB multihit.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/multihit.html#mitigation-control-on-the-kernel-command-line-and-kvm-module-parameter
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"
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