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My commit 7a2e845a865dc7fa82d2393ea2a770cfc8cf00b4 (and its prerequisites) managed to effectively ignore the clear_emulator_capabilities setting in qemu.conf (visible in the code as the VIR_EXEC_CLEAR_CAPS flag when qemu is being exec'ed), with the result that the capabilities are always cleared regardless of the qemu.conf setting. This patch fixes it by passing the flag through to virSetUIDGIDWithCaps(), which uses it to decide whether or not to clear existing capabilities before adding in those that were requested. Note that the existing capabilities are *always* cleared if the new process is going to run as non-root, since the whole point of running non-root is to have the capabilities removed (it's still possible to maintain individual capabilities as needed using the capBits argument though). (cherry picked from commit 2639c6320647778c1496008058dde57dfca35b92)
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>
Description
Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.
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