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Merged
adrelanos merged 2 commits into from
Aug 22, 2022
Merged

Comment out machine check exception #113

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92669db
Comment out machine check exception
raja-grewal Aug 21, 2022
d500205
Update README.md
raja-grewal Aug 21, 2022
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3 changes: 0 additions & 3 deletions README.md
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Expand Up @@ -68,9 +68,6 @@ use-after-free vulnerabilities and erase sensitive information in memory.

* Page allocator freelist randomization is enabled.

* The machine check tolerance level is decreased which makes the kernel panic
on uncorrectable errors in ECC memory that could be exploited.

* Kernel Page Table Isolation is enabled to mitigate Meltdown and increase
KASLR effectiveness.

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5 changes: 3 additions & 2 deletions etc/default/grub.d/40_kernel_hardening.cfg
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Expand Up @@ -17,8 +17,9 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slab_nomerge"
## Zero memory at allocation and free time.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX init_on_alloc=1 init_on_free=1"

## Makes the kernel panic on uncorrectable errors in ECC memory that an attacker could exploit.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mce=0"
## Machine check exception handler decides whether the system should panic or not based on the exception that happened.
## https://forums.whonix.org/t/kernel-hardening/7296/494
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mce=0"

## Enables Kernel Page Table Isolation which mitigates Meltdown and improves KASLR.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX pti=on"
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