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2bdf548f5f
This fixes the problem reported in: https://bugzilla.redhat.com/show_bug.cgi?id=972690 When checking for a collision of a new libvirt network's subnet with any existing routes, we read all of /proc/net/route into memory, then parse all the entries. The function that we use to read this file requires a "maximum length" parameter, which had previously been set to 64*1024. As each line in /proc/net/route is 128 bytes, this would allow for a maximum of 512 entries in the routing table. This patch increases that number to 128 * 100000, which allows for 100,000 routing table entries. This means that it's possible that 12MB would be allocated, but that would only happen if there really were 100,000 route table entries on the system, it's only held for a very short time. Since there is no method of specifying and unlimited max (and that would create a potential denial of service anyway) hopefully this limit is large enough to accomodate everyone.
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>