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Update docs on pti=on

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raja-grewal 2025-11-03 04:31:59 +00:00 • committed by GitHub
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4
README.md
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@ -208,8 +208,8 @@ Kernel space:
- Enable the kernel page allocator to randomize free lists to limit some data - Enable the kernel page allocator to randomize free lists to limit some data
exfiltration and ROP attacks, especially during the early boot process. exfiltration and ROP attacks, especially during the early boot process.
- Enable kernel page table isolation to increase KASLR effectiveness and also - Enable kernel page table isolation on X86_64 CPUs to increase KASLR effectiveness
mitigate the Meltdown CPU vulnerability. and also mitigate the Meltdown CPU vulnerability.
- Enable randomization of the kernel stack offset on syscall entries to harden - Enable randomization of the kernel stack offset on syscall entries to harden
against memory corruption attacks. against memory corruption attacks.

4
etc/default/grub.d/40_kernel_hardening.cfg#security-misc-shared
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@ -83,8 +83,10 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX init_on_free=1"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX page_alloc.shuffle=1" GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX page_alloc.shuffle=1"
## Enable kernel page table isolation to harden against kernel ASLR (KASLR) bypasses. ## Enable kernel page table isolation to harden against kernel ASLR (KASLR) bypasses.
## Mitigates the Meltdown CPU vulnerability. ## Mitigates the Meltdown (Spectre Variant 3) CPU vulnerability.
## Mitigations for ARM64 CPUs are done in /etc/default/grub.d/40_cpu_mitigations.cfg using "kpti=1".
## ##
## https://en.wikipedia.org/wiki/Meltdown_(security_vulnerability)
## https://en.wikipedia.org/wiki/Kernel_page-table_isolation ## https://en.wikipedia.org/wiki/Kernel_page-table_isolation
## ##
## KSPP=yes ## KSPP=yes