Re: [PATCH v11 26/39] arm64/ptrace: Expose GCS via ptrace and core files

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To: Mark Brown <broonie@xxxxxxxxxx>
Subject: Re: [PATCH v11 26/39] arm64/ptrace: Expose GCS via ptrace and core files
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Date: Fri, 23 Aug 2024 10:41:55 +0100
Cc: Will Deacon <will@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Oliver Upton <oliver.upton@xxxxxxxxx>, James Morse <james.morse@xxxxxxx>, Suzuki K Poulose <suzuki.poulose@xxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, "Rick P. Edgecombe" <rick.p.edgecombe@xxxxxxxxx>, Deepak Gupta <debug@xxxxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, Szabolcs Nagy <Szabolcs.Nagy@xxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, "H.J. Lu" <hjl.tools@xxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, Florian Weimer <fweimer@xxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Thiago Jung Bauermann <thiago.bauermann@xxxxxxxxxx>, Ross Burton <ross.burton@xxxxxxx>, Yury Khrustalev <yury.khrustalev@xxxxxxx>, Wilco Dijkstra <wilco.dijkstra@xxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20240822-arm64-gcs-v11-26-41b81947ecb5@kernel.org>

On Thu, Aug 22, 2024 at 02:15:29AM +0100, Mark Brown wrote:
> Provide a new register type NT_ARM_GCS reporting the current GCS mode
> and pointer for EL0.  Due to the interactions with allocation and
> deallocation of Guarded Control Stacks we do not permit any changes to
> the GCS mode via ptrace, only GCSPR_EL0 may be changed.
> 
> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@xxxxxxxxxx>
> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>

Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>

References:
- [PATCH v11 00/39] arm64/gcs: Provide support for GCS in userspace
  - From: Mark Brown
- [PATCH v11 26/39] arm64/ptrace: Expose GCS via ptrace and core files
  - From: Mark Brown

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