[PATCH v1 RFC Zisslpcfi 15/20] sslp prctl: arch-agnostic prctl for shadow stack and landing pad instr

[Mark Brown]

On Sun, Feb 12, 2023 at 08:53:44PM -0800, Deepak Gupta wrote:
> Three architectures (x86, aarch64, riscv) have announced support for
> shadow stack and enforcing requirement of landing pad instructions on
> indirect call/jmp. This patch adds arch-agnostic prtcl support to enable
> /disable/get/set status of shadow stack and forward control (landing pad)
> flow cfi statuses.
> 
> New prctls are
>       - PR_GET_SHADOW_STACK_STATUS, PR_SET_SHADOW_STACK_STATUS
>       - PR_GET_INDIRECT_BR_LP_STATUS, PR_SET_INDIRECT_BR_LP_STATUS

FWIW I had something very similar in my in progress arm64 support for
GCS (our equivalent feature), though without the LP stuff as we don't
have that.

Reviewed-by: Mark Brown <broonie at kernel.org>

I'll pull this into my branch and redo things on top of it if that's OK,
seems sensible to avoid collisions/duplication?
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