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

[Peter Zijlstra]

On Mon, Jan 31, 2022 at 10:05:20AM +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.
> 
> Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
> Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>

For both patches:

Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>