On Fri, 18 Sep 2020 11:47:11 +0100, Boyan Karatotev wrote:
> Pointer Authentication (PAuth) is a security feature introduced in ARMv8.3.
> It introduces instructions to sign addresses and later check for potential
> corruption using a second modifier value and one of a set of keys. The
> signature, in the form of the Pointer Authentication Code (PAC), is stored
> in some of the top unused bits of the virtual address (e.g. [54: 49] if
> TBID0 is enabled and TnSZ is set to use a 48 bit VA space). A set of
> controls are present to enable/disable groups of instructions (which use
> certain keys) for compatibility with libraries that do not utilize the
> feature. PAuth is used to verify the integrity of return addresses on the
> stack with less memory than the stack canary.
>
> [...]
Applied to arm64 (for-next/selftests), thanks!
[1/4] kselftests/arm64: add a basic Pointer Authentication test
https://git.kernel.org/arm64/c/e74e1d557285
[2/4] kselftests/arm64: add nop checks for PAuth tests
https://git.kernel.org/arm64/c/766d95b1ed93
[3/4] kselftests/arm64: add PAuth test for whether exec() changes keys
https://git.kernel.org/arm64/c/806a15b2545e
[4/4] kselftests/arm64: add PAuth tests for single threaded consistency and differently initialized keys
https://git.kernel.org/arm64/c/d21435e9670b
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
