| Description: | The libvirt library is a C API for managing and interacting with thevirtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualizedsystems. It was found that libvirt passes the XML_PARSE_NOENT flag when parsing XMLdocuments using the libxml2 library, in which case all XML entities in theparsed documents are expanded. A user able to force libvirtd to parse anXML document with an entity pointing to a special file that blocks on readaccess could use this flaw to cause libvirtd to hang indefinitely,resulting in a denial of service on the system. (CVE-2014-0179)Red Hat would like to thank the upstream Libvirt project for reporting thisissue. Upstream acknowledges Daniel P. Berrange and Richard Jones as theoriginal reporters.This update also fixes the following bugs:* When hot unplugging a virtual CPU (vCPU), libvirt kept a pointer toalready freed memory if the vCPU was pinned to a host CPU. Consequently,when reading the CPU pinning information, libvirt terminated unexpectedlydue to an attempt to access this memory. This update ensures that libvirtreleases the pointer to the previously allocated memory when a vCPU isbeing hot unplugged, and it no longer crashes in this situation.(BZ#1091206)* Previously, libvirt passed an incorrect argument to the "tc" command whensetting quality of service (QoS) on a network interface controller (NIC).As a consequence, QoS was applied only to IP traffic. With this update,libvirt constructs the "tc" command correctly so that QoS is applied to alltraffic as expected. (BZ#1096806)* When using the sanlock daemon for managing access to shared storage,libvirt expected all QEMU domains to be registered with sanlock. However,if a QEMU domain was started prior to enabling sanlock, the domain was notregistered with sanlock. Consequently, migration of a virtual machine (VM)from such a QEMU domain failed with a libvirt error. With this update,libvirt verifies whether a QEMU domain process is registered with sanlockbefore it starts working with the domain, ensuring that migration ofvirtual machines works as expected. (BZ#1097227)All libvirt users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. After installing theupdated packages, libvirtd will be restarted automatically. |