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Patrick Schleizer 2024-07-17 11:52:29 -04:00
parent f4da582aa3
commit d454f36c63
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1 changed files with 10 additions and 10 deletions
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20
etc/default/grub.d/40_kernel_hardening.cfg
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@ -11,7 +11,7 @@ kver="$(dpkg-query --show --showformat='${Version}' "$kpkg")" 2>/dev/null || tru
## 3. Entropy
## 4. Networking
## See the documentation below for details on the majority of the selected commands.
## See the documentation below for details on the majority of the selected commands:
## https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
## https://wiki.archlinux.org/title/Kernel_parameters#GRUB
@ -37,10 +37,10 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slab_nomerge"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX init_on_alloc=1"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX init_on_free=1"
## Enable the kernel page allocator to randomise free lists.
## During early boot the page allocator has predictable FIFO behaviour for physical pages.
## Enable the kernel page allocator to randomize free lists.
## During early boot, the page allocator has predictable FIFO behavior for physical pages.
## Limits some data exfiltration and ROP attacks that rely on inferring sensitive data location.
## Also improves performance by optimising memory-side cache utilisation.
## Also improves performance by optimizing memory-side cache utilization.
##
## https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e900a918b0984ec8f2eb150b8477a47b75d17692
## https://en.wikipedia.org/wiki/Return-oriented_programming#Attacks
@ -54,7 +54,7 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX page_alloc.shuffle=1"
##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX pti=on"
## Enable randomisation of the kernel stack offset on syscall entries.
## Enable randomization of the kernel stack offset on syscall entries.
## Hardens against memory corruption attacks due to increased entropy.
## Limits attacks relying on deterministic stack addresses or cross-syscall address exposure.
##
@ -96,7 +96,7 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX debugfs=off"
## https://www.kernel.org/doc/html/latest/arch/x86/x86_64/boot-options.html#machine-check
## https://forums.whonix.org/t/kernel-hardening/7296/494
##
## The default kernel setting will be utilised until provided sufficient evidence to modify.
## The default kernel setting will be utilized until provided sufficient evidence to modify.
##
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mce=0"
@ -143,7 +143,7 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX iommu.passthrough=0"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX iommu.strict=1"
## Disable the busmaster bit on all PCI bridges during the early boot process.
## Patches weak-point in some existing IOMMU implementations.
## Patches weak points in some existing IOMMU implementations.
## May lead to issues such as complete system boot failure on certain devices.
##
## https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4444f8541dad16fefd9b8807ad1451e806ef1d94
@ -159,8 +159,8 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX efi=disable_early_pci_dma"
## The RDRAND CPU (RNG) instructions are proprietary and closed-source.
## Numerous implementations of RDRAND have a long history of being defective.
## The RNG seed passed by the bootloader could also potentially be tampered.
## Maximising the entropy pool at boot is desirable for all cryptographic operations.
## These settings ensure additional entropy is obtained from other sources to initialise the RNG.
## Maximizing the entropy pool at boot is desirable for all cryptographic operations.
## These settings ensure additional entropy is obtained from other sources to initialize the RNG.
## Note that distrusting these (relatively fast) sources of entropy will increase boot time.
##
## https://en.wikipedia.org/wiki/RDRAND#Reception
@ -175,7 +175,7 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX efi=disable_early_pci_dma"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX random.trust_bootloader=off"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX random.trust_cpu=off"
## Obtain more entropy during boot as the runtime memory allocator is being initialised.
## Obtain more entropy during boot as the runtime memory allocator is being initialized.
## Entropy will be extracted from up to the first 4GB of RAM.
## Requires the linux-hardened kernel patch.
##