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

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Message-ID: <8ed76335-f87f-42e7-85b0-94a6e2b2cc3f@sirena.org.uk>
Date:   Thu, 25 May 2023 18:17:56 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Deepak Gupta <debug@...osinc.com>
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v1 RFC Zisslpcfi 15/20] sslp prctl: arch-agnostic prctl
 for shadow stack and landing pad instr

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@...nel.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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