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Merge remote-tracking branch 'raja/block_32bit' into arraybolt3/trixie

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Aaron Rainbolt 2025-08-17 14:02:01 -05:00
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3
README.md
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@ -223,8 +223,7 @@ Kernel space:
- Use kCFI as the default CFI implementation as it is more resilient to attacks that are
able to write arbitrary executables into memory omitting the necessary hash validation.
- Optional - Disable support for all x86 processes and syscalls (when using Linux kernel >= 6.7)
to reduce attack surface.
- Disable support for all 32-bit x86 processes and syscalls to reduce attack surface.
- Disable the EFI persistent storage feature which prevents the kernel from writing crash logs
and other persistent data to either the UEFI variable storage or ACPI ERST backends.

7
etc/default/grub.d/40_kernel_hardening.cfg
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@ -206,7 +206,7 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vdso32=0"
##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX cfi=kcfi"
## Disable support for x86 processes and syscalls.
## Disable support for all 32-bit x86 processes and syscalls.
## Unconditionally disables IA32 emulation to substantially reduce attack surface.
##
## https://lore.kernel.org/all/20230623111409.3047467-7-nik.borisov@suse.com/
@ -214,10 +214,7 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX cfi=kcfi"
## KSPP=yes
## KSPP does not set CONFIG_COMPAT, CONFIG_IA32_EMULATION, CONFIG_X86_X32, CONFIG_X86_X32_ABI, and CONFIG_MODIFY_LDT_SYSCALL.
##
## TODO: Debian 13 Trixie
## Applicable when using Linux kernel >= 6.7 (retained here for future-proofing and completeness).
##
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX ia32_emulation=0"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX ia32_emulation=0"
## Disable EFI persistent storage feature.
## Disable Error Record Serialization Table (ERST) support as a form of defense-in-depth.