2022-05-20 14:46:38 -04:00
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## Copyright (C) 2019 - 2022 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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2022-07-18 12:29:46 -04:00
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## Enables all known mitigations for CPU vulnerabilities.
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2020-02-12 13:42:13 -05:00
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##
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2022-07-18 12:29:46 -04:00
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/index.html
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2020-02-12 13:42:13 -05:00
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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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2022-07-18 12:29:46 -04:00
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## Enable mitigations for Spectre variant 2 (indirect branch speculation).
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2020-02-12 13:42:13 -05:00
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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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2022-07-18 12:29:46 -04:00
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## Enable mitigations for the L1TF vulnerability through disabling SMT
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## and L1D flush runtime control.
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2020-02-12 13:42:13 -05:00
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##
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2022-07-18 12:29:46 -04:00
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1tf=full,force"
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2020-02-12 13:42:13 -05:00
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2022-07-18 12:29:46 -04:00
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## Enable mitigations for the MDS vulnerability through clearing buffer cache
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## and disabling SMT.
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2020-02-12 13:42:13 -05:00
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"
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2022-07-18 12:29:46 -04:00
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## Patches the TAA vulnerability by disabling TSX and enables mitigations using
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## TSX Async Abort along with disabling SMT.
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2020-02-12 13:42:13 -05:00
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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="$GRUB_CMDLINE_LINUX tsx=off tsx_async_abort=full,nosmt"
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2020-02-12 13:42:13 -05:00
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## Mark all huge pages in the EPT as non-executable to mitigate iTLB multihit.
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##
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2022-07-18 12:29:46 -04:00
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/multihit.html
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2020-02-12 13:42:13 -05:00
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"
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2022-07-18 12:30:49 -04:00
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## Enables mitigations for SRBDS to prevent MDS attacks on RDRAND and RDSEED instructions.
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2022-07-18 13:16:08 -04:00
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## Only mitigated through microcode updates from Intel.
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2022-07-18 12:30:49 -04:00
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/special-register-buffer-data-sampling.html
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2022-07-18 13:16:08 -04:00
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## https://access.redhat.com/solutions/5142691
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2022-07-18 12:32:41 -04:00
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2022-07-18 13:38:41 -04:00
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## Force disable SMT as it has caused numerous CPU vulnerabilities.
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## The only full mitigation of cross-HT attacks is to disable SMT.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/core-scheduling.html
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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="$GRUB_CMDLINE_LINUX nosmt=force"
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2022-07-18 12:32:41 -04:00
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## Enables the prctl interface to prevent leaks from L1D on context switches.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1d_flush.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1d_flush=on"
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2022-07-18 12:33:16 -04:00
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## Mitigates numerous MMIO Stale Data vulnerabilities and disables SMT.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/processor_mmio_stale_data.html
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mmio_stale_data=full,nosmt"
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