linux-kernel - Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel

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Date:   Wed, 24 Jul 2019 16:16:49 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>, kvm@...r.kernel.org,
        Szabolcs Nagy <Szabolcs.Nagy@....com>,
        Will Deacon <will.deacon@....com>,
        dri-devel@...ts.freedesktop.org,
        Kostya Serebryany <kcc@...gle.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org,
        Christoph Hellwig <hch@...radead.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Dave Martin <Dave.Martin@....com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        linux-media@...r.kernel.org, Kevin Brodsky <kevin.brodsky@....com>,
        Kees Cook <keescook@...omium.org>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yishai Hadas <yishaih@...lanox.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Lee Smith <Lee.Smith@....com>,
        Alexander Deucher <Alexander.Deucher@....com>,
        enh <enh@...gle.com>, Robin Murphy <robin.murphy@....com>,
        Christian Koenig <Christian.Koenig@....com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Subject: Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel

On Wed, Jul 24, 2019 at 4:02 PM Will Deacon <will@...nel.org> wrote:
>
> Hi Andrey,
>
> On Tue, Jul 23, 2019 at 08:03:29PM +0200, Andrey Konovalov wrote:
> > On Tue, Jul 23, 2019 at 7:59 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
> > >
> > > === Overview
> > >
> > > arm64 has a feature called Top Byte Ignore, which allows to embed pointer
> > > tags into the top byte of each pointer. Userspace programs (such as
> > > HWASan, a memory debugging tool [1]) might use this feature and pass
> > > tagged user pointers to the kernel through syscalls or other interfaces.
> > >
> > > Right now the kernel is already able to handle user faults with tagged
> > > pointers, due to these patches:
> > >
> > > 1. 81cddd65 ("arm64: traps: fix userspace cache maintenance emulation on a
> > >              tagged pointer")
> > > 2. 7dcd9dd8 ("arm64: hw_breakpoint: fix watchpoint matching for tagged
> > >               pointers")
> > > 3. 276e9327 ("arm64: entry: improve data abort handling of tagged
> > >               pointers")
> > >
> > > This patchset extends tagged pointer support to syscall arguments.
>
> [...]
>
> > Do you think this is ready to be merged?
> >
> > Should this go through the mm or the arm tree?
>
> I would certainly prefer to take at least the arm64 bits via the arm64 tree
> (i.e. patches 1, 2 and 15). We also need a Documentation patch describing
> the new ABI.

Sounds good! Should I post those patches together with the
Documentation patches from Vincenzo as a separate patchset?

Vincenzo, could you share the last version of the Documentation patches?

Thanks!

>
> Will