linux-kernel - Re: [PATCH] drm/virtio: Fix GEM handle creation UAF

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Message-ID: <CAF6AEGvGb66L7cXod40PiKijJRTCOhWL+qCz4bgmi-69ZxJt8Q@mail.gmail.com>
Date:   Mon, 9 Jan 2023 17:47:34 -0800
From:   Rob Clark <robdclark@...il.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        open list <linux-kernel@...r.kernel.org>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        David Airlie <airlied@...hat.com>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH] drm/virtio: Fix GEM handle creation UAF

On Mon, Jan 9, 2023 at 3:28 PM Dmitry Osipenko
<dmitry.osipenko@...labora.com> wrote:
>
> On 12/17/22 02:33, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > Userspace can guess the handle value and try to race GEM object creation
> > with handle close, resulting in a use-after-free if we dereference the
> > object after dropping the handle's reference.  For that reason, dropping
> > the handle's reference must be done *after* we are done dereferencing
> > the object.
> >
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > ---
> >  drivers/gpu/drm/virtio/virtgpu_ioctl.c | 19 +++++++++++++++++--
> >  1 file changed, 17 insertions(+), 2 deletions(-)
>
> Added fixes/stable tags and applied this virtio-gpu patch to misc-fixes.
> The Panfrost patch is untouched.

Thanks.. the panfrost patch was not intended to be part of the same
series (but apparently that is what happens when I send them at the
same time), and was superceded by a patch from Steven Price (commit
4217c6ac8174 ("drm/panfrost: Fix GEM handle creation ref-counting")
already applied to misc-fixes

BR,
-R