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CVE-2013-6458 https://bugzilla.redhat.com/show_bug.cgi?id=1043069 When virDomainDetachDeviceFlags is called concurrently to virDomainBlockStats: libvirtd may crash because qemuDomainBlockStats finds a disk in vm->def before getting a job on a domain and uses the disk pointer after getting the job. However, the domain in unlocked while waiting on a job condition and thus data behind the disk pointer may disappear. This happens when thread 1 runs virDomainDetachDeviceFlags and enters monitor to actually remove the disk. Then another thread starts running virDomainBlockStats, finds the disk in vm->def, and while it's waiting on the job condition (owned by the first thread), the first thread finishes the disk removal. When the second thread gets the job, the memory pointed to be the disk pointer is already gone. That said, every API that is going to begin a job should do that before fetching data from vm->def. Conflicts: src/qemu/qemu_driver.c (cherry picked from commit db86da5ca2109e4006c286a09b6c75bfe10676ad)
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>