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| author |  Kees Cook <keescook@chromium.org>
| 2023-08-24 21:25:55 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org>
| 2023-09-22 09:50:55 -0700 |
| commit | 215199e3d9f3dc01a6d10b8229891e6f7f1085e7 (patch) | |
| tree | c9556972bf81693b8ddc2596c703e5cdeed3b032 /arch/x86/configs | |
| parent | Linux 6.6-rc2 (diff) | |
| download | linux-215199e3d9f3dc01a6d10b8229891e6f7f1085e7.tar.gz linux-215199e3d9f3dc01a6d10b8229891e6f7f1085e7.tar.bz2 linux-215199e3d9f3dc01a6d10b8229891e6f7f1085e7.zip | |
hardening: Provide Kconfig fragments for basic options
Inspired by Salvatore Mesoraca's earlier[1] efforts to provide some
in-tree guidance for kernel hardening Kconfig options, add a new fragment
named "hardening-basic.config" (along with some arch-specific fragments)
that enable a basic set of kernel hardening options that have the least
(or no) performance impact and remove a reasonable set of legacy APIs.
Using this fragment is as simple as running "make hardening.config".
More extreme fragments can be added[2] in the future to cover all the
recognized hardening options, and more per-architecture files can be
added too.
For now, document the fragments directly via comments. Perhaps .rst
documentation can be generated from them in the future (rather than the
other way around).
[1] https://lore.kernel.org/kernel-hardening/1536516257-30871-1-git-send-email-s.mesoraca16@gmail.com/
[2] https://github.com/KSPP/linux/issues/14
Cc: Salvatore Mesoraca <s.mesoraca16@gmail.com>
Cc: x86@kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-doc@vger.kernel.org
Cc: linux-kbuild@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'arch/x86/configs')
| -rw-r--r-- | arch/x86/configs/hardening.config | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/configs/hardening.config b/arch/x86/configs/hardening.config new file mode 100644 index 000000000000..19bb0c7a7669 --- /dev/null +++ b/arch/x86/configs/hardening.config @@ -0,0 +1,15 @@ +# Basic kernel hardening options (specific to x86) + +# Modern libc no longer needs a fixed-position mapping in userspace, remove +# it as a possible target. +CONFIG_LEGACY_VSYSCALL_NONE=y + +# Enable chip-specific IOMMU support. +CONFIG_INTEL_IOMMU=y +CONFIG_INTEL_IOMMU_DEFAULT_ON=y +CONFIG_INTEL_IOMMU_SVM=y +CONFIG_AMD_IOMMU=y +CONFIG_AMD_IOMMU_V2=y + +# Enable CET Shadow Stack for userspace. +CONFIG_X86_USER_SHADOW_STACK=y |