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

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Message-ID: <baf2665c-49aa-4b8a-be26-69dc23876bee@sirena.org.uk>
Date: Thu, 30 Oct 2025 18:45:20 +0000
From: Mark Brown <broonie@...nel.org>
To: Andi Kleen <andi@...stfloor.org>
Cc: Peter Zijlstra <peterz@...radead.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 11:31:38AM -0700, Andi Kleen wrote:
> On Thu, Oct 30, 2025 at 06:07:49PM +0000, Mark Brown wrote:

> > It's going to take a *considerable* time for the hardware support to
> > become standard.

> Optimizing for the past instead of the future?

On arm64 no currently available hardware has shadow stack support, and
once systems start becoming available it'll take a very long time for
that to filter down to even being all newly shipping systems, let alone
all systems that people care about running new software on.

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

My experience trying to find a system to test changes on was somewhat
different :(  I did eventually get something.

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