linux-kernel - Re: [PATCH v3 11/36] arm64/mm: Map pages for guarded control stack

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Message-ID: <1cbd6d5a-0e58-4a3f-b7e5-bbab09f03c5d@sirena.org.uk>
Date:   Tue, 1 Aug 2023 20:05:16 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Mike Rapoport <rppt@...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 v3 11/36] arm64/mm: Map pages for guarded control stack

On Tue, Aug 01, 2023 at 08:02:31PM +0300, Mike Rapoport wrote:
> On Mon, Jul 31, 2023 at 02:43:20PM +0100, Mark Brown wrote:

> >  {
> > -	pteval_t prot = pgprot_val(protection_map[vm_flags &
> > +	pteval_t prot;
> > +
> > +	/*
> > +	 * If this is a GCS then only interpret VM_WRITE.
> > +	 *
> > +	 * TODO: Just make protection_map[] bigger?  Nothing seems
> > +	 * ideal here.
> > +	 */

> I think extending protection_map and updating adjust_protection_map() is
> cleaner and probably faster.

That was my initial thought but then I immediately started second
guessing myself about review comments.  Hopefully Will or Catalin will
weigh in.

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