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Enable vmscape=force

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raja-grewal 2025-09-13 03:41:59 +00:00 • committed by GitHub
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README.md
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@ -178,6 +178,8 @@ CPU mitigations:
- Indirect Target Selection (ITS)
- VMScape
Boot parameters relating to kernel hardening, DMA mitigations, and entropy
generation are outlined in the `/etc/default/grub.d/40_kernel_hardening.cfg`
configuration file.

9
etc/default/grub.d/40_cpu_mitigations.cfg
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@ -195,3 +195,12 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX reg_file_data_sampling=on"
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/indirect-target-selection.html
##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX indirect_target_selection=force"
## VMScape:
## Mitigate the vulnerability by flushing branch predictors before returning to userspace when exiting guests.
## Comprehensive protection may also require disabling SMT to limit cross-thread attacks.
## Currently affects both AMD and Intel CPUs.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/vmscape.html
##
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX vmscape=force"