linux-kernel - Re: [PATCH] x86/shstk: Enable shadow stack for x32

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Date: Fri, 22 Mar 2024 09:49:37 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "H.J. Lu" <hjl.tools@...il.com>, linux-kernel@...r.kernel.org
Cc: x86@...nel.org, Rick P Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH] x86/shstk: Enable shadow stack for x32

On 3/15/24 07:04, H.J. Lu wrote:
> 1. Add shadow stack support to x32 signal.
> 2. Use the 64-bit map_shadow_stack syscall for x32.
> 3. Set up shadow stack for x32.
> 
> Tested with shadow stack enabled x32 glibc on Intel Tiger Lake.

I don't think we should wire up code that's never going to get used in
practice.  I think I'd want to be sure of the existence of some
specific, real-world, long-term users of this before we add a new ABI
that we need to support forever.

Are there real users?