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Merge remote-tracking branch 'origin/master'

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Patrick Schleizer 2020-02-13 13:37:34 -05:00
commit 76a51a3b45
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3 changed files with 43 additions and 27 deletions
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7
debian/control vendored
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@ -66,12 +66,7 @@ Description: enhances misc security settings
* Kernel Page Table Isolation is enabled to mitigate Meltdown and increase
KASLR effectiveness.
.
* SMT is disabled as it can be used to exploit the MDS and other
vulnerabilities.
.
* All mitigations for the MDS vulnerability are enabled.
.
* Enables mitigations for the L1TF (L1 Terminal Fault) vulnerability.
* Enables all mitigations for CPU vulnerabilities and disables SMT.
.
* A systemd service clears System.map on boot as these contain kernel symbols
that could be useful to an attacker.

42
etc/default/grub.d/40_cpu_mitigations.cfg Normal file
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@ -0,0 +1,42 @@
## Copyright (C) 2019 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
## See the file COPYING for copying conditions.
## Enables all mitigations for CPU vulnerabilities.
##
## 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.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/spectre.html
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
## and L1D flush runtime control.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1tf=full,force"
## Force disable SMT as it has caused numerous CPU vulnerabilities.
##
## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX nosmt=force"
## 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
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"

21
etc/default/grub.d/40_kernel_hardening.cfg
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@ -36,27 +36,6 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mce=0"
## Enables Kernel Page Table Isolation which mitigates Meltdown and improves KASLR.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX pti=on"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spectre_v2=on"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spec_store_bypass_disable=on"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx=off"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx_async_abort=full,nosmt"
## Enables all mitigations for the MDS vulnerability.
## 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="$GRUB_CMDLINE_LINUX nosmt=force"
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/multihit.html#mitigation-control-on-the-kernel-command-line-and-kvm-module-parameter
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"
## Vsyscalls are obsolete, are at fixed addresses and are a target for ROP.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vsyscall=none"