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832f160247
Since introduction of the DAC security driver we've documented that seclabels with a leading + can be used with numerical uid. This would not work though with the rest of libvirt if the uid was not actually used in the system as we'd fail when trying to get a list of supplementary groups for the given uid. Since a uid without entry in /etc/passwd (or other user database) will not have any supplementary groups we can treat the failure to obtain them as such. This patch modifies virGetGroupList to not report the error for missing users and makes it return an empty list or just the group specified in @gid. All callers will grant less permissions to a user in case of failure of this function and thus this change is safe.
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>