linux-kernel - Re: [PATCH v15 00/17] arm64: untag user pointers passed to the kernel

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Message-ID: <20190529121225.q2zjgurxqnohvmkg@mbp>
Date:   Wed, 29 May 2019 13:12:25 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, linux-media@...r.kernel.org,
        kvm@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yishai Hadas <yishaih@...lanox.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alexander Deucher <Alexander.Deucher@....com>,
        Christian Koenig <Christian.Koenig@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Leon Romanovsky <leon@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Lee Smith <Lee.Smith@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Robin Murphy <robin.murphy@....com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Dave Martin <Dave.Martin@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>,
        Elliott Hughes <enh@...gle.com>,
        Khalid Aziz <khalid.aziz@...cle.com>
Subject: Re: [PATCH v15 00/17] arm64: untag user pointers passed to the kernel

On Tue, May 28, 2019 at 11:11:26PM -0700, Christoph Hellwig wrote:
> On Tue, May 28, 2019 at 04:14:45PM +0200, Andrey Konovalov wrote:
> > Thanks for a lot of valuable input! I've read through all the replies
> > and got somewhat lost. What are the changes I need to do to this
> > series?
> > 
> > 1. Should I move untagging for memory syscalls back to the generic
> > code so other arches would make use of it as well, or should I keep
> > the arm64 specific memory syscalls wrappers and address the comments
> > on that patch?
> 
> It absolutely needs to move to common code.  Having arch code leads
> to pointless (often unintentional) semantic difference between
> architectures, and lots of boilerplate code.

That's fine by me as long as we agree on the semantics (which shouldn't
be hard; Khalid already following up). We should probably also move the
proposed ABI document [1] into a common place (or part of since we'll
have arm64-specifics like prctl() calls to explicitly opt in to memory
tagging).

[1] https://lore.kernel.org/lkml/20190318163533.26838-1-vincenzo.frascino@arm.com/T/#u

-- 
Catalin