arm64: BTI: Add Kconfig entry for userspace BTI
Now that the code for userspace BTI support is in the kernel add the Kconfig entry so that it can be built and used. [Split out of "arm64: Basic Branch Target Identification support" -- broonie] Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
parent
424037b775
commit
383499f886
|
@ -1522,6 +1522,28 @@ endmenu
|
||||||
|
|
||||||
menu "ARMv8.5 architectural features"
|
menu "ARMv8.5 architectural features"
|
||||||
|
|
||||||
|
config ARM64_BTI
|
||||||
|
bool "Branch Target Identification support"
|
||||||
|
default y
|
||||||
|
help
|
||||||
|
Branch Target Identification (part of the ARMv8.5 Extensions)
|
||||||
|
provides a mechanism to limit the set of locations to which computed
|
||||||
|
branch instructions such as BR or BLR can jump.
|
||||||
|
|
||||||
|
To make use of BTI on CPUs that support it, say Y.
|
||||||
|
|
||||||
|
BTI is intended to provide complementary protection to other control
|
||||||
|
flow integrity protection mechanisms, such as the Pointer
|
||||||
|
authentication mechanism provided as part of the ARMv8.3 Extensions.
|
||||||
|
For this reason, it does not make sense to enable this option without
|
||||||
|
also enabling support for pointer authentication. Thus, when
|
||||||
|
enabling this option you should also select ARM64_PTR_AUTH=y.
|
||||||
|
|
||||||
|
Userspace binaries must also be specifically compiled to make use of
|
||||||
|
this mechanism. If you say N here or the hardware does not support
|
||||||
|
BTI, such binaries can still run, but you get no additional
|
||||||
|
enforcement of branch destinations.
|
||||||
|
|
||||||
config ARM64_E0PD
|
config ARM64_E0PD
|
||||||
bool "Enable support for E0PD"
|
bool "Enable support for E0PD"
|
||||||
default y
|
default y
|
||||||
|
|
Loading…
Reference in a new issue