mirror of
https://github.com/Kicksecure/security-misc.git
synced 2024-10-01 08:25:45 -04:00
59 lines
2.3 KiB
INI
59 lines
2.3 KiB
INI
## Copyright (C) 2019 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
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## See the file COPYING for copying conditions.
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kver="$(uname -r)"
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#echo "## kver: $kver"
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## Disables the merging of slabs of similar sizes.
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## Sometimes a slab can be used in a vulnerable way which an attacker can exploit.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slab_nomerge"
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if dpkg --compare-versions "$kver" ge "5.3"; then
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## Enables sanity checks (F) and redzoning (Z).
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slub_debug=FZ"
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#echo "## $kver grater or equal 5.3: yes"
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## Zero memory at allocation and free time.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX init_on_alloc=1 init_on_free=1"
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else
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#echo "## $kver grater or equal 5.3: no"
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## SLUB poisoning and page poisoning is used if the kernel
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## does not yet support init_on_{,alloc,free}.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slub_debug=FZP"
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if command -v "qubesdb-read" >/dev/null 2>&1 ; then
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## https://github.com/QubesOS/qubes-issues/issues/5212#issuecomment-533873012
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true "skip adding page_poison=1 in Qubes"
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else
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX page_poison=1"
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fi
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fi
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## Makes the kernel panic on uncorrectable errors in ECC memory that an attacker could exploit.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mce=0"
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## Enables Kernel Page Table Isolation which mitigates Meltdown and improves KASLR.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX pti=on"
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## Enables all mitigations for the MDS vulnerability.
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## Disables smt which can be used to exploit the MDS vulnerability.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"
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## Vsyscalls are obsolete, are at fixed addresses and are a target for ROP.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vsyscall=none"
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## Enables page allocator freelist randomization.
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if dpkg --compare-versions "${kver}" ge "5.2"; then
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX page_alloc.shuffle=1"
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fi
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## Enables kernel lockdown.
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##
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## Disabled for now as it enforces module signature verification which breaks
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## too many things.
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## https://forums.whonix.org/t/enforce-kernel-module-software-signature-verification-module-signing-disallow-kernel-module-loading-by-default/7880
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##
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#if dpkg --compare-versions "${kver}" ge "5.4"; then
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# GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX lockdown=confidentiality"
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#fi
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