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Patrick Schleizer 2025-08-21 06:44:35 -04:00
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2
README.md
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@ -48,7 +48,7 @@ configuration file and significant hardening is applied to a myriad of component
and thwart certain kernel exploitation attempts) and kernel warnings in the `WARN()` path. and thwart certain kernel exploitation attempts) and kernel warnings in the `WARN()` path.
- Force immediate system reboot on the occurrence of a single kernel panic, reducing the - Force immediate system reboot on the occurrence of a single kernel panic, reducing the
risk and impact of both denial of service and cold boot attacks. risk and impact of denial of service attacks and both cold and warm boot attacks.
- Disable the use of legacy TIOCSTI operations which can be used to inject keypresses. - Disable the use of legacy TIOCSTI operations which can be used to inject keypresses.

10
etc/default/grub.d/40_kernel_hardening.cfg
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@ -118,16 +118,18 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vsyscall=none"
## ##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX debugfs=off" GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX debugfs=off"
## Force the kernel to panic on "oopses". ## Force the kernel to immediately panic on "oopses".
## Can sometimes potentially indicate and thwart certain kernel exploitation attempts.
## Panics may be due to false-positives such as bad drivers. ## Panics may be due to false-positives such as bad drivers.
## Oopses are serious but non-fatal errors.
## Certain "oopses" can sometimes indicate and thwart potential kernel exploitation attempts.
## Note that by forcing kernel panics on oopses, this exposes the system to targeted denial of service attacks.
## ##
## https://en.wikipedia.org/wiki/Kernel_panic#Linux ## https://en.wikipedia.org/wiki/Kernel_panic#Linux
## https://en.wikipedia.org/wiki/Linux_kernel_oops ## https://en.wikipedia.org/wiki/Linux_kernel_oops
## https://forums.whonix.org/t/set-oops-panic-kernel-parameter-or-kernel-panic-on-oops-1-sysctl-for-better-security/7713 ## https://forums.whonix.org/t/set-oops-panic-kernel-parameter-or-kernel-panic-on-oops-1-sysctl-for-better-security/7713
## ##
## KSPP=partial ## KSPP=yes
## KSPP sets CONFIG_PANIC_ON_OOPS=y, but also requires CONFIG_PANIC_TIMEOUT=-1. ## KSPP sets CONFIG_PANIC_ON_OOPS=y and CONFIG_PANIC_TIMEOUT=-1.
## ##
## See /usr/libexec/security-misc/panic-on-oops for implementation. ## See /usr/libexec/security-misc/panic-on-oops for implementation.
## ##

1
etc/modprobe.d/30_security-misc_conntrack.conf
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@ -7,6 +7,7 @@
## Disabling it reduces the kernel attack surface and improves security. ## Disabling it reduces the kernel attack surface and improves security.
## ##
## https://conntrack-tools.netfilter.org/manual.html ## https://conntrack-tools.netfilter.org/manual.html
## https://home.regit.org/netfilter-en/secure-use-of-helpers/
## https://forums.whonix.org/t/disable-conntrack-helper/18917 ## https://forums.whonix.org/t/disable-conntrack-helper/18917
## ##
options nf_conntrack nf_conntrack_helper=0 options nf_conntrack nf_conntrack_helper=0

3
usr/lib/sysctl.d/990-security-misc.conf
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@ -175,7 +175,6 @@ kernel.perf_event_paranoid=3
## ##
## https://en.wikipedia.org/wiki/Kernel_panic#Linux ## https://en.wikipedia.org/wiki/Kernel_panic#Linux
## https://en.wikipedia.org/wiki/Linux_kernel_oops ## https://en.wikipedia.org/wiki/Linux_kernel_oops
## https://en.wikipedia.org/wiki/Kdump_(Linux)
## https://lwn.net/Articles/876209/ ## https://lwn.net/Articles/876209/
## https://git.sr.ht/~gregkh/presentation-security/tree/3fdaf81a2f8b2c8d64cdb2f529cc714624868aa8/item/security-stuff.pdf ## https://git.sr.ht/~gregkh/presentation-security/tree/3fdaf81a2f8b2c8d64cdb2f529cc714624868aa8/item/security-stuff.pdf
## https://forums.whonix.org/t/set-oops-panic-kernel-parameter-or-kernel-panisc-on-oops-1-sysctl-for-better-security/7713 ## https://forums.whonix.org/t/set-oops-panic-kernel-parameter-or-kernel-panisc-on-oops-1-sysctl-for-better-security/7713
@ -189,8 +188,8 @@ kernel.perf_event_paranoid=3
#kernel.warn_limit=1 #kernel.warn_limit=1
## Force immediate system reboots on the occurrence of a single kernel panic. ## Force immediate system reboots on the occurrence of a single kernel panic.
## Ensures the system does not hang forever if a panic occurs, reducing susceptibility to cold boot attacks.
## Increases resilience and limits impact of denial of service attacks as system automatically restarts. ## Increases resilience and limits impact of denial of service attacks as system automatically restarts.
## Ensures the system does not hang forever if a panic occurs, reducing susceptibility to both cold and warm boot attacks.
## Immediate rebooting also prevents persistent information disclosure on panic details that were dumped to screen. ## Immediate rebooting also prevents persistent information disclosure on panic details that were dumped to screen.
## ##
## KSPP=yes ## KSPP=yes

4
usr/libexec/security-misc/panic-on-oops
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@ -24,7 +24,7 @@ sysctl kernel.oops_limit=1
sysctl kernel.warn_limit=1 sysctl kernel.warn_limit=1
## Makes the system immediately reboot on the occurrence of a single ## Makes the system immediately reboot on the occurrence of a single
## kernel panic. This reduces the risk and impact of both denial of ## kernel panic. This reduces the risk and impact of denial of
## service and cold boot attacks. ## service attacks and both cold and warmm boot attacks.
## https://docs.kernel.org/admin-guide/sysctl/kernel.html#panic ## https://docs.kernel.org/admin-guide/sysctl/kernel.html#panic
sysctl kernel.panic=-1 sysctl kernel.panic=-1