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

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Message-ID: <5f0620c55a01d6a195154783a477ec295cbb4b1c.camel@intel.com>
Date: Fri, 15 Mar 2024 14:20:19 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hjl.tools@...il.com" <hjl.tools@...il.com>
CC: "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH] x86/shstk: Enable shadow stack for x32

On Fri, 2024-03-15 at 07:04 -0700, 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.
> 
> Cc: Rick P Edgecombe <rick.p.edgecombe@...el.com>
> Tested-by: H.J. Lu <hjl.tools@...il.com>
> Signed-off-by: H.J. Lu <hjl.tools@...il.com>

How many people do you think will use this?

I would have thought it would require more changes for basic x32
operation. What was the testing exactly?