Re: [PATCH 23/24] vhost-user-fs: Implement drop CAP_FSETID functionality

[Vivek Goyal]

On Thu, Feb 11, 2021 at 02:35:42PM +0000, Stefan Hajnoczi wrote:
> On Tue, Feb 09, 2021 at 07:02:23PM +0000, Dr. David Alan Gilbert (git) wrote:
> > From: Vivek Goyal <vgoyal@redhat.com>
> > 
> > As part of slave_io message, slave can ask to do I/O on an fd. Additionally
> > slave can ask for dropping CAP_FSETID (if master has it) before doing I/O.
> > Implement functionality to drop CAP_FSETID and gain it back after the
> > operation.
> > 
> > This also creates a dependency on libcap-ng.
> 
> Is this patch only for the case where QEMU is running as root?
> 

Yes, it primarily is for the case where qemu is running as root, or
somebody managed to launch it non-root but with still having capability
CAP_FSETID.

Vivek

> I'm not sure it will have any effect on a regular QEMU (e.g. launched by
> libvirt).