linux-kernel - Re: [PATCH v7 22/39] arm64/gcs: Implement shadow stack prctl() interface

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Message-ID: <87edfzhvia.fsf@linaro.org>
Date:   Wed, 06 Dec 2023 18:27:25 -0300
From:   Thiago Jung Bauermann <thiago.bauermann@...aro.org>
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>,
        Florian Weimer <fweimer@...hat.com>,
        Christian Brauner <brauner@...nel.org>,
        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 v7 22/39] arm64/gcs: Implement shadow stack prctl()
 interface


Mark Brown <broonie@...nel.org> writes:

> Implement the architecture neutral prtctl() interface for setting the
> shadow stack status, this supports setting and reading the current GCS
> configuration for the current thread.
>
> Userspace can enable basic GCS functionality and additionally also
> support for GCS pushes and arbatrary GCS stores.  It is expected that

s/arbatrary/arbitrary/

> this prctl() will be called very early in application startup, for
> example by the dynamic linker, and not subsequently adjusted during
> normal operation.  Users should carefully note that after enabling GCS
> for a thread GCS will become active with no call stack so it is not
> normally possible to return from the function that invoked the prctl().

-- 
Thiago