Git-Mirrors/security-misc
1
0
Fork 0
mirror of https://github.com/Kicksecure/security-misc.git synced 2025-11-28 16:40:32 -05:00
Code Issues Projects Releases Packages Wiki Activity

Make panic related settings consistent

Browse source 
Ensures the `sysctl` and boot parameters are equivalent in settings and in description. This should prevent future questions regarding having omitted boot parameters that were actually redundant.
This commit is contained in:
raja-grewal 2025-11-15 04:51:01 +00:00 • committed by GitHub
parent 0b9b9ffb1e
commit b6fe1a5a6e
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
2 changed files with 27 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

7
README.md
View file

@ -219,8 +219,11 @@ Kernel space:
- Restrict access to debugfs by not registering the file system since it can - Restrict access to debugfs by not registering the file system since it can
contain sensitive information. contain sensitive information.
- Force kernel panics on "oopses" to potentially indicate and thwart certain - Force the kernel to immediately panic on both "oopses" (which can potentially indicate
kernel exploitation attempts. 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
risk and impact of denial-of-service attacks and both cold and warm boot attacks.
- Optional - Modify the machine check exception handler. - Optional - Modify the machine check exception handler.

26
etc/default/grub.d/40_kernel_hardening.cfg#security-misc-shared
View file

@ -126,22 +126,40 @@ 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 immediately panic on "oopses". ## Force the kernel to immediately panic on "oopses" and kernel warnings in the WARN() path.
## Panics may be due to false-positives such as bad drivers. ## Panics may be due to false-positives such as bad drivers.
## Both allowed limits are set to one so that panics occur on the single first instance of either scenario.
## Oopses are serious but non-fatal errors. ## Oopses are serious but non-fatal errors.
## Certain "oopses" can sometimes indicate and thwart potential kernel exploitation attempts. ## 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. ## Warnings are messages generated by the kernel to indicate unexpected conditions or errors.
## By default, code execution continues regardless of warnings emitted by macros like WARN() and WARN_ON().
## Note that by forcing kernel panics on oopses and warnings, 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://lwn.net/Articles/876209/
## 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
## ##
## KSPP=yes ## KSPP=yes
## KSPP sets CONFIG_PANIC_ON_OOPS=y and CONFIG_PANIC_TIMEOUT=-1. ## KSPP sets CONFIG_PANIC_ON_OOPS=y.
## ##
## See /usr/libexec/security-misc/panic-on-oops for implementation. ## See /usr/libexec/security-misc/panic-on-oops for implementation.
## ##
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX oops=panic" #GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX oops=panic"
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX panic_on_warn=1"
## Force immediate system reboots on the occurrence of a single kernel panic.
## 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.
##
## KSPP=yes
## KSPP sets CONFIG_PANIC_TIMEOUT=-1.
##
## See /usr/libexec/security-misc/panic-on-oops for implementation.
##
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX panic=-1"
## Modify machine check exception handler. ## Modify machine check exception handler.
## Can decide whether the system should panic or not based on the occurrence of an exception. ## Can decide whether the system should panic or not based on the occurrence of an exception.