linux-kernel - Re: [PATCH RFT v17 3/8] selftests: Provide helper header for shadow stack testing

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Message-ID: <aF0z_7Q_ETj7Cjro@arm.com>
Date: Thu, 26 Jun 2025 12:50:23 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Mark Brown <broonie@...nel.org>
Cc: "Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
	Deepak Gupta <debug@...osinc.com>,
	Szabolcs Nagy <Szabolcs.Nagy@....com>,
	"H.J. Lu" <hjl.tools@...il.com>,
	Florian Weimer <fweimer@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Christian Brauner <brauner@...nel.org>,
	Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
	Will Deacon <will@...nel.org>, jannh@...gle.com,
	Yury Khrustalev <yury.khrustalev@....com>,
	Wilco Dijkstra <wilco.dijkstra@....com>,
	linux-kselftest@...r.kernel.org, linux-api@...r.kernel.org,
	Kees Cook <kees@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH RFT v17 3/8] selftests: Provide helper header for shadow
 stack testing

On Mon, Jun 09, 2025 at 01:54:04PM +0100, Mark Brown wrote:
> While almost all users of shadow stacks should be relying on the dynamic
> linker and libc to enable the feature there are several low level test
> programs where it is useful to enable without any libc support, allowing
> testing without full system enablement. This low level testing is helpful
> during bringup of the support itself, and also in enabling coverage by
> automated testing without needing all system components in the target root
> filesystems to have enablement.
> 
> Provide a header with helpers for this purpose, intended for use only by
> test programs directly exercising shadow stack interfaces.
> 
> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> Reviewed-by: Kees Cook <kees@...nel.org>
> Tested-by: Kees Cook <kees@...nel.org>
> Acked-by: Shuah Khan <skhan@...uxfoundation.org>
> Signed-off-by: Mark Brown <broonie@...nel.org>

Acked-by: Catalin Marinas <catalin.marinas@....com>