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Add details about slub_debug

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Raja Grewal 2024-08-03 15:11:14 +10:00
parent b77d1a2b98
commit 22b6cee80c
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2 changed files with 9 additions and 4 deletions
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4
README.md
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@ -118,8 +118,8 @@ configuration file.
- Disable merging of slabs with similar size, which reduces the risk of
triggering heap overflows and limits influencing slab cache layout.
- Provides option to enable sanity checks and red zoning via slab debugging.
Not reccommened due to implicit disabling of kernel pointer hashing.
- Provide the option to enable sanity checks and red zoning via slab debugging.
Enabling this feature will implicitly disable kernel pointer hashing.
- Enable memory zeroing at both allocation and free time, which mitigates some
use-after-free vulnerabilities by erasing sensitive information in memory.

9
etc/default/grub.d/40_kernel_hardening.cfg
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@ -28,12 +28,17 @@ kver="$(dpkg-query --show --showformat='${Version}' "$kpkg")" 2>/dev/null || tru
##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slab_nomerge"
## Enable sanity checks and red zoning of slabs.
## Enable sanity checks and red zoning of slabs via debugging options to detect corruption.
## As a by product of debugging, this will implicitly disabling kernel pointer hashing.
## Enabling will therefore leak exact and all kernel memory addresses to root.
## Has the potential to cause a noticeable performance decrease.
##
## https://www.kernel.org/doc/html/latest/mm/slub.html
## https://lore.kernel.org/all/20210601182202.3011020-5-swboyd@chromium.org/T/#u
## https://gitlab.tails.boum.org/tails/tails/-/issues/19613
##
## Disabled as enabling this implicitly disables kernel pointer hashing.
## The default kernel setting will be utilized until provided sufficient evidence to modify.
## https://github.com/Kicksecure/security-misc/issues/253
##
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX slub_debug=FZ"