[SRU][Focal][PATCH 0/3] CVE-2023-39198

[Bethany Jamison]

[Impact]

A race condition was found in the QXL driver in the Linux kernel. The
qxl_mode_dumb_create() function dereferences the qobj returned by the
qxl_gem_object_create_with_handle(), but the handle is the only one holding
a reference to it. This flaw allows an attacker to guess the returned
handle value and trigger a use-after-free issue, potentially leading to a
denial of service or privilege escalation.

[Fix]

2 prerequisite and 1 fix commit cherry-picked cleanly.

[Test Case]

Compile and boot tested.

[Regression Potential]

Issues could occur for users who use the qxl driver when creating a drm
gem object.

Emil Velikov (1):
  drm/qxl: remove _unlocked suffix in drm_gem_object_put_unlocked

Gerd Hoffmann (1):
  drm/qxl: allocate dumb buffers in ram

Wander Lairson Costa (1):
  drm/qxl: fix UAF on handle creation

 drivers/gpu/drm/qxl/qxl_cmd.c     |  2 +-
 drivers/gpu/drm/qxl/qxl_display.c |  6 +++---
 drivers/gpu/drm/qxl/qxl_drv.h     |  2 +-
 drivers/gpu/drm/qxl/qxl_dumb.c    |  9 ++++++---
 drivers/gpu/drm/qxl/qxl_gem.c     | 25 +++++++++++++++++--------
 drivers/gpu/drm/qxl/qxl_ioctl.c   | 10 ++++------
 drivers/gpu/drm/qxl/qxl_object.c  |  4 ++--
 7 files changed, 34 insertions(+), 24 deletions(-)

-- 
2.34.1