mirror of
https://github.com/Kicksecure/security-misc.git
synced 2024-10-01 08:25:45 -04:00
65 lines
2.9 KiB
INI
65 lines
2.9 KiB
INI
## Copyright (C) 2019 - 2022 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
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## See the file COPYING for copying conditions.
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kpkg="linux-image-$(dpkg --print-architecture)" || true
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kver="$(dpkg-query --show --showformat='${Version}' "$kpkg")" 2>/dev/null || true
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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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## Enables sanity checks (F) and redzoning (Z).
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## Disabled due to kernel deciding to implicitly disable kernel pointer hashing
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## https://github.com/torvalds/linux/commit/792702911f581f7793962fbeb99d5c3a1b28f4c3
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#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slub_debug=FZ"
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## Zero memory at allocation and free time.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX init_on_alloc=1 init_on_free=1"
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## Machine check exception handler decides whether the system should panic or not based on the exception that happened.
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## https://forums.whonix.org/t/kernel-hardening/7296/494
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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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## Vsyscalls are obsolete, are at fixed addresses and are a target for ROP.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vsyscall=none"
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## Enables page allocator freelist randomization.
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX page_alloc.shuffle=1"
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## Enables randomisation of the kernel stack offset on syscall entries (introduced in kernel 5.13).
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## https://lkml.org/lkml/2019/3/18/246
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX randomize_kstack_offset=on"
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## Enables kernel lockdown.
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##
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## Disabled for now as it enforces module signature verification which breaks
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## too many things.
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## https://forums.whonix.org/t/enforce-kernel-module-software-signature-verification-module-signing-disallow-kernel-module-loading-by-default/7880
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##
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#if dpkg --compare-versions "${kver}" ge "5.4"; then
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# GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX lockdown=confidentiality"
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#fi
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## Gather more entropy during boot.
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##
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## Requires linux-hardened kernel patch.
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## https://github.com/anthraxx/linux-hardened
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX extra_latent_entropy"
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## Restrict access to debugfs since it can contain a lot of sensitive information.
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## https://lkml.org/lkml/2020/7/16/122
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## https://github.com/torvalds/linux/blob/fb1201aececc59990b75ef59fca93ae4aa1e1444/Documentation/admin-guide/kernel-parameters.txt#L835-L848
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX debugfs=off"
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## Force the kernel to panic on "oopses" (which may be due to false positives)
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## https://forums.whonix.org/t/set-oops-panic-kernel-parameter-or-kernel-panic-on-oops-1-sysctl-for-better-security/7713
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## Implemented differently:
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## /usr/libexec/security-misc/panic-on-oops
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## /etc/X11/Xsession.d/50panic_on_oops
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## /etc/sudoers.d/security-misc
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#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX oops=panic"
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