mirror of
https://github.com/Kicksecure/security-misc.git
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118 lines
5.0 KiB
INI
118 lines
5.0 KiB
INI
## Copyright (C) 2019 - 2024 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
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## See the file COPYING for copying conditions.
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## Enable known mitigations for CPU vulnerabilities.
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/index.html
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## https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.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
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## Check for potential updates directly from AMD and Intel.
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## https://www.amd.com/en/resources/product-security.html
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## https://www.intel.com/content/www/us/en/developer/topic-technology/software-security-guidance/advisory-guidance.html
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## https://www.intel.com/content/www/us/en/developer/topic-technology/software-security-guidance/disclosure-documentation.html
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## Enable a subset of known mitigations for CPU vulnerabilities and disable SMT.
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mitigations=auto,nosmt"
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## Disable SMT as it has been the cause of and amplified numerous CPU exploits.
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## The only full mitigation of cross-HT attacks is to disable SMT.
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## Disabling will significantly decrease system performance on multi-threaded tasks.
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## To enable SMT, remove this line and all other occurrences of "nosmt" in this file.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/core-scheduling.html
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## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
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## https://github.com/anthraxx/linux-hardened/issues/37#issuecomment-619597365
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX nosmt=force"
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## Enable mitigations for both Spectre Variant 2 (indirect branch speculation)
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## and Intel branch history injection (BHI) vulnerabilities.
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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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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spectre_v2=on"
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spectre_bhi=on"
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## Disable Speculative Store Bypass (Spectre Variant 4).
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##
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## https://www.suse.com/support/kb/doc/?id=000019189
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spec_store_bypass_disable=on"
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## Enable mitigations for the L1TF vulnerability through disabling SMT
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## and L1D flush runtime control.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1tf=full,force"
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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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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"
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## Patches the TAA vulnerability by disabling TSX and enables mitigations using
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## TSX Async Abort along with disabling SMT.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx=off"
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx_async_abort=full,nosmt"
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## Mark all huge pages in the EPT as non-executable to mitigate iTLB multihit.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/multihit.html
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"
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## Mitigations for SRBDS to prevent MDS attacks on RDRAND and RDSEED instructions
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## are only possible through microcode updates from Intel.
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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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## https://access.redhat.com/solutions/5142691
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## Enable 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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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1d_flush=on"
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## Mitigate numerous MMIO Stale Data vulnerabilities and disable SMT.
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/processor_mmio_stale_data.html
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mmio_stale_data=full,nosmt"
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## Enable mitigations for RETBleed (Arbitrary Speculative Code Execution with
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## Return Instructions) vulnerability and disable SMT.
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## https://www.suse.com/support/kb/doc/?id=000020693
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX retbleed=auto,nosmt"
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## Control RAS overflow mitigation on AMD Zen CPUs.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/srso.html
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##
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## The default kernel setting will be utilized until provided sufficient evidence to modify.
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##
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#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spec_rstack_overflow=safe-ret"
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## Enable Gather Data Sampling (GDS) mitigation.
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## Note for systems that have not received a suitable microcode update this will
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## entirely disable use of the AVX instructions set.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/gather_data_sampling.html
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX gather_data_sampling=force"
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## Enable Register File Data Sampling (RFDS) mitigation on Intel Atom CPUs which
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## encompasses E-cores on hybrid architectures.
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##
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## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/reg-file-data-sampling.html
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##
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX reg_file_data_sampling=on"
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