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Merge pull request #260 from raja-grewal/vdso32

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Enable `vdso32=0`
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Patrick Schleizer 2024-08-06 09:55:20 -04:00 committed by GitHub
commit a25aaf900a
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2 changed files with 6 additions and 6 deletions
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README.md
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@ -149,7 +149,7 @@ configuration file.
- Enable the kernel Electric-Fence sampling-based memory safety error detector
which can identify heap out-of-bounds access, use-after-free, and invalid-free errors.
- Provide the option to disable 32 bit vDSO mappings.
- Disable 32-bit vDSO mappings as they are a legacy compatibility feature.
- Provide the option to use kCFI as the default CFI implementation since it may be
slightly more resilient to attacks that are able to write arbitrary executables

10
etc/default/grub.d/40_kernel_hardening.cfg
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@ -134,13 +134,13 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX debugfs=off"
##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kfence.sample_interval=100"
## Disable x86 Virtual Dynamic Shared Object (vDSO) mappings.
## Disable 32-bit Virtual Dynamic Shared Object (vDSO) mappings.
## Legacy compatibility feature for superseded glibc versions.
##
## https://en.wikipedia.org/wiki/VDSO
## https://lore.kernel.org/lkml/20080409082927.BD59E26F992@magilla.localdomain/T/
## https://lists.openwall.net/linux-kernel/2014/03/11/3
##
## The use of 32 bit vDSO mappings is currently enabled.
##
#GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vdso32=0"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vdso32=0"
## Switch (back) to using kCFI as the default Control Flow Integrity (CFI) implementation.
## The default implementation is FIneIBT as of Linux kernel 6.2.