On Sun, 16 Jul 2023 22:51:22 +0100 Mark Brown <broonie@xxxxxxxxxx> wrote: > Provide a Kconfig option allowing the user to select if GCS support is > built into the kernel. > > Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> > --- > arch/arm64/Kconfig | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 7856c3a3e35a..e1aeeda13c52 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2091,6 +2091,25 @@ config ARM64_EPAN > if the cpu does not implement the feature. > endmenu # "ARMv8.7 architectural features" > > +menu "v9.4 architectural features" > + > +config ARM64_GCS > + bool "Enable support for Guarded Control Stack (GCS)" > + default y > + select ARCH_USES_HIGH_VMA_FLAGS > + help > + Guarded Control Stack (GCS) provides support for a separate > + stack with restricted access which contains only return > + addresses. This can be used to harden against some attacks > + by comparing return address used by the program with what is > + stored in the GCS, and may also be used to efficiently obtain > + the call stack for applications such as profiling. > + > + The feature is detected at runtime, and will remain disabled > + if the system does not implement the feature. > + > +endmenu # "2022 archiectural features" Inconsistent naming and spelling mistake. > + > config ARM64_SVE > bool "ARM Scalable Vector Extension support" > default y >
