linux-kernel - Re: Concerns about SFrame viability for userspace stack walking

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Message-ID: <23a87719-2672-493e-9d84-9b4c0438c029@sirena.org.uk>
Date: Fri, 31 Oct 2025 11:46:25 +0000
From: Mark Brown <broonie@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Andi Kleen <andi@...stfloor.org>, Fangrui Song <maskray@...rceware.org>,
	linux-toolchains@...r.kernel.org, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Concerns about SFrame viability for userspace stack walking

On Thu, Oct 30, 2025 at 07:57:25PM +0100, Peter Zijlstra wrote:
> On Thu, Oct 30, 2025 at 11:31:38AM -0700, Andi Kleen wrote:

> > Not on x86 at least. All my x86 systems have it, except for a few old
> > skylakes.

> About half of my systems have CET, but I just checked, none of them
> seem to actually use userspace shadow stacks.

> AFAICT Debian hasn't build their packages with this stuff on.

It hasn't - they're starting to roll it out now in the development
distro, an actual release is a couple of years away at this point.

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