Re: [PATCH v2 1/2] stack: Introduce CONFIG_RANDOMIZE_KSTACK_OFFSET

[Kees Cook]

On Mon, 31 Jan 2022 10:05:20 +0100, Marco Elver wrote:
> The randomize_kstack_offset feature is unconditionally compiled in when
> the architecture supports it.
> 
> To add constraints on compiler versions, we require a dedicated Kconfig
> variable. Therefore, introduce RANDOMIZE_KSTACK_OFFSET.
> 
> Furthermore, this option is now also configurable by EXPERT kernels:
> while the feature is supposed to have zero performance overhead when
> disabled, due to its use of static branches, there are few cases where
> giving a distribution the option to disable the feature entirely makes
> sense. For example, in very resource constrained environments, which
> would never enable the feature to begin with, in which case the
> additional kernel code size increase would be redundant.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/2] stack: Introduce CONFIG_RANDOMIZE_KSTACK_OFFSET
      https://git.kernel.org/kees/c/8cb37a5974a4
[2/2] stack: Constrain and fix stack offset randomization with Clang builds
      https://git.kernel.org/kees/c/efa90c11f62e

-- 
Kees Cook