RHBA-2010:0722 - Bug Fix Advisory

Topic

Updated xorg-x11-server packages that resolve an issue are now available.

Description

X.org X11 is an open source implementation of the X Window System. It provides
the basic low level functionality upon which full fledged graphical user
interfaces such as GNOME and KDE are designed.

These updated xorg-x11-server packages fix the following bug:

• the 'miDbePositionWindow' function allocates two pixmaps: a front buffer, and

a back buffer. If the buffers are supposed to be initialized, it validates a
graphic context (GC) against the front buffer, then uses it to fill and/or copy
both the front buffer and the back buffer, without revalidating. If the
acceleration architecture needed different GC functions for the two pixmaps, for
example if allocation of the front buffer exhausted video memory, then this
caused crashes because the GC was not validated for the back buffer pixmap. With
this update, the crashes no longer occur and GC validation works as expected.
(BZ#626328)

All users of xorg-x11-server are advised to upgrade to these updated packages,
which resolve this issue.

Solution

Before applying this update, make sure that all previously-released errata
relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use the Red Hat
Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 626328 - X.org: DBE should validate front and back buffers separately.

CVEs

(none)

References

(none)