linux-kernel - [PATCH 0/3] drm, drm/vmwgfx: fixes and updates related to drm

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Date:   Thu, 22 Jul 2021 17:29:26 +0800
From:   Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>
To:     linux-graphics-maintainer@...are.com, zackr@...are.com,
        airlied@...ux.ie, daniel@...ll.ch,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de
Cc:     Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, skhan@...uxfoundation.org,
        gregkh@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [PATCH 0/3] drm, drm/vmwgfx: fixes and updates related to drm_master

Hi,

This series contains some improvements that Daniel Vetter proposed following a discussion on a recent series:
https://lore.kernel.org/lkml/20210712043508.11584-1-desmondcheongzx@gmail.com/

While preparing these patches, I also noticed some unprotected uses of drm_master in the vmwgfx driver that can be addressed by new functions from the previous series.

This series is thus broken up into three patches:

1. Switch from the outer drm_device.master_mutex to the inner drm_file.master_lookup_lock in drm_is_current_master.

2. Update the kerneldoc for lease fields in drm_master to clarify lifetime/locking rules.

3. Prevent potential use-after-free bugs by replacing calls to drm_master_get with drm_file_get_master in vmwgfx_surface.c.

Best wishes,
Desmond

Desmond Cheong Zhi Xi (3):
  drm: use the lookup lock in drm_is_current_master
  drm: clarify lifetime/locking for drm_master's lease fields
  drm/vmwgfx: fix potential UAF in vmwgfx_surface.c

 drivers/gpu/drm/drm_auth.c              |  9 ++--
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c |  4 +-
 include/drm/drm_auth.h                  | 62 ++++++++++++++++++++-----
 3 files changed, 58 insertions(+), 17 deletions(-)

-- 
2.25.1