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Message-ID: <Zschq9JbvIRjmXVR@arm.com>
Date: Thu, 22 Aug 2024 12:31:55 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Mark Brown <broonie@...nel.org>
Cc: Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>,
Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>,
James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Arnd Bergmann <arnd@...db.de>, Oleg Nesterov <oleg@...hat.com>,
Eric Biederman <ebiederm@...ssion.com>,
Shuah Khan <shuah@...nel.org>,
"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>,
Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>,
"H.J. Lu" <hjl.tools@...il.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Florian Weimer <fweimer@...hat.com>,
Christian Brauner <brauner@...nel.org>,
Thiago Jung Bauermann <thiago.bauermann@...aro.org>,
Ross Burton <ross.burton@....com>,
Yury Khrustalev <yury.khrustalev@....com>,
Wilco Dijkstra <wilco.dijkstra@....com>,
linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
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Subject: Re: [PATCH v11 18/39] arm64/traps: Handle GCS exceptions
On Thu, Aug 22, 2024 at 02:15:21AM +0100, Mark Brown wrote:
> A new exception code is defined for GCS specific faults other than
> standard load/store faults, for example GCS token validation failures,
> add handling for this. These faults are reported to userspace as
> segfaults with code SEGV_CPERR (protection error), mirroring the
> reporting for x86 shadow stack errors.
>
> GCS faults due to memory load/store operations generate data aborts with
> a flag set, these will be handled separately as part of the data abort
> handling.
>
> Since we do not currently enable GCS for EL1 we should not get any faults
> there but while we're at it we wire things up there, treating any GCS
> fault as fatal.
>
> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@...aro.org>
> Signed-off-by: Mark Brown <broonie@...nel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
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