Re: [PATCH v13 22/40] arm64/gcs: Ensure that new threads have a GCS

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To: Catalin Marinas <catalin.marinas@xxxxxxx>
Subject: Re: [PATCH v13 22/40] arm64/gcs: Ensure that new threads have a GCS
From: Mark Brown <broonie@xxxxxxxxxx>
Date: Fri, 4 Oct 2024 12:50:08 +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>, David Spickett <david.spickett@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: <Zv_PFVffwIkKevzE@arm.com>

On Fri, Oct 04, 2024 at 02:18:45PM +0300, Catalin Marinas wrote:

> I think Szabolcs mentioned a GCS leak with v12:

> https://lore.kernel.org/r/ZtrihWQFyb2/XrQV@xxxxxxx

> (and in some private messages IIRC)

> Has this been identified? The changelog only mentions a leak in v8.

Yes, it's this in the changelog:

  - Implement mm_release() and free transparently allocated GCSs there.

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References:
- [PATCH v13 00/40] arm64/gcs: Provide support for GCS in userspace
  - From: Mark Brown
- [PATCH v13 22/40] arm64/gcs: Ensure that new threads have a GCS
  - From: Mark Brown
- Re: [PATCH v13 22/40] arm64/gcs: Ensure that new threads have a GCS
  - From: Catalin Marinas

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