On 5/19/22 00:53, ksobrenat32 wrote:
Hi!
I have a debian 11 (bullseye) machine running libvirtd version 7.0.0 and a RHEL 9 virtual machine that I need to share a disk and though about virtiofs.
The disk is a btrfs disk and I have successfully mount it with:
<filesystem type='mount' accessmode='passthrough'> <driver type='virtiofs' queue='1024'/> <binary path='/usr/lib/qemu/virtiofsd' xattr='on'> <cache mode='always'/> <lock posix='on' flock='on'/> </binary> <source dir='/mnt/WD-Disk'/> <target dir='media'/> <alias name='fs0'/> <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/> </filesystem>
The problem I have is with selinux, when I try to change the context of a file inside the virtual machine I get a 'Operation not permitted' error, I can change the context in the Debian host and see the changes in the virtual machine but I would want to be able to change the context from the vm to able to use podman containers with selinux enabled.
I see on the docs https://qemu.readthedocs.io/en/latest/tools/virtiofsd.html#selinux-support you can run virtiofsd with a xattr option so it is compatible with selinux but I do not find a way to change the domain xml to add this option, is there a way to add this option? Does a better option exists (maybe on the guest side)?
Yeah, I don't think this was implemented. However, virtiofsd is running as root:root and with no capabilities dropped. So I guess what we're missing here is -o security_label or might as well implement the remap as docs suggest which is much safer. Michal