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Currently, when restoring from a domain the path that the domain restores from is labelled under qemuSecuritySetAllLabel() (and after v6.3.0-rc1~108 even outside transactions). While this grants QEMU the access, it has a flaw, because once the domain is restored, up and running then qemuSecurityDomainRestorePathLabel() is called, which is not real counterpart. In case of DAC driver the SetAllLabel() does nothing with the restore path but RestorePathLabel() does - it chown()-s the file back and since there is no original label remembered, the file is chown()-ed to root:root. While the apparent solution is to have DAC driver set the label (and thus remember the original one) in SetAllLabel(), we can do better. Turns out, we are opening the file ourselves (because it may live on a root squashed NFS) and then are just passing the FD to QEMU. But this means, that we don't have to chown() the file at all, we need to set SELinux labels and/or add the path to AppArmor profile. And since we want to restore labels right after QEMU is done loading the migration stream (we don't want to wait until qemuSecurityRestoreAllLabel()), the best way to approach this is to have separate APIs for labelling and restoring label on the restore file. I will investigate whether AppArmor can use the SavedStateLabel() API instead of passing the restore path to SetAllLabel(). Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1851016 Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Erik Skultety <eskultet@redhat.com>
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==============================
Libvirt API for virtualization
==============================
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.
For some of these hypervisors, it provides a stateful management
daemon which runs on the virtualization host allowing access to the
API both by non-privileged local users and remote users.
Layered packages provide bindings of the libvirt C API into other
languages including Python, Perl, PHP, Go, Java, OCaml, as well as
mappings into object systems such as GObject, CIM and SNMP.
Further information about the libvirt project can be found on the
website:
https://libvirt.org
License
=======
The libvirt C API is distributed under the terms of GNU Lesser General
Public License, version 2.1 (or later). Some parts of the code that are
not part of the C library may have the more restrictive GNU General
Public License, version 2.0 (or later). See the files ``COPYING.LESSER``
and ``COPYING`` for full license terms & conditions.
Installation
============
Instructions on building and installing libvirt can be found on the website:
https://libvirt.org/compiling.html
Contributing
============
The libvirt project welcomes contributions in many ways. For most components
the best way to contribute is to send patches to the primary development
mailing list. Further guidance on this can be found on the website:
https://libvirt.org/contribute.html
Contact
=======
The libvirt project has two primary mailing lists:
* libvirt-users@redhat.com (**for user discussions**)
* libvir-list@redhat.com (**for development only**)
Further details on contacting the project are available on the website:
https://libvirt.org/contact.html