linux-kernel - Re: [PATCH 04/35] arm64/gcs: Document the ABI for Guarded Control Stacks

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Date:   Mon, 17 Jul 2023 12:42:47 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Catalin Marinas <catalin.marinas@....com>,
        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>,
        "Kees Cook" <keescook@...omium.org>, 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>,
        "H.J. Lu" <hjl.tools@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-doc@...r.kernel.org>, <kvmarm@...ts.linux.dev>,
        <linux-fsdevel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-kselftest@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 04/35] arm64/gcs: Document the ABI for Guarded Control
 Stacks

On Sun, 16 Jul 2023 22:51:00 +0100
Mark Brown <broonie@...nel.org> wrote:

> Add some documentation of the userspace ABI for Guarded Control Stacks.
> 
> Signed-off-by: Mark Brown <broonie@...nel.org>
Hi Mark,

Nice document.  All I could find on a first read was one typo...

...

> +7.  ptrace extensions
> +---------------------
> +
> +* A new regset NT_ARM_GCS is defined for use with PTRACE_GETREGSET and
> +  PTRACE_SETREGSET.
> +
> +* Due to the complexity surrounding allocation and deallocation of stakcs and

stacks

> +  lack of practical application changes to the GCS configuration via ptrace
> +  are not supported.
> +