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b07f3d821d
The code assumes that def->vcpus == nvcpupids, so when we setup fake CPU pids for old QEMU with nvcpupids == 1, we cause the later code to read off the end of the array. This has fun results like sche_setaffinity(0, ...) which changes libvirtd's own CPU affinity, or even better sched_setaffinity($RANDOM, ...) which changes the affinity of a random OS process.
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>