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Set efi_pstore.pstore_disable=1

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raja-grewal 2025-03-16 03:30:04 +00:00 committed by GitHub
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README.md
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@ -226,6 +226,9 @@ Kernel space:
- Optional - Disable support for all x86 processes and syscalls (when using Linux kernel >= 6.7)
to reduce attack surface.
- Disable EFI persistent storage feature, preventing the kernel from writing crash logs and
other persistent data to the EFI variable store.
Direct memory access:
- Enable strict IOMMU translation to protect against some DMA attacks via the use

12
etc/default/grub.d/40_kernel_hardening.cfg
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@ -223,6 +223,18 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vdso32=0"
##
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX ia32_emulation=0"
## Disable EFI persistent storage feature.
## Prevents the kernel from writing crash logs and other persistent data to the EFI variable store.
##
## https://blogs.oracle.com/linux/post/pstore-linux-kernel-persistent-storage-file-system
## https://www.ais.com/understanding-pstore-linux-kernel-persistent-storage-file-system/
## https://lwn.net/Articles/434821/
## https://manpages.debian.org/testing/systemd/systemd-pstore.service.8.en.html
## https://gitlab.tails.boum.org/tails/tails/-/issues/20813
## https://github.com/Kicksecure/security-misc/issues/299
##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX efi_pstore.pstore_disable=1"
## 2. Direct Memory Access:
##
## https://madaidans-insecurities.github.io/guides/linux-hardening.html#dma-attacks