Re: [RFC v4 PATCH 49/49] multi-process: add configure and usage information

[Stefan Hajnoczi]

On Thu, Nov 07, 2019 at 09:33:45AM -0500, Michael S. Tsirkin wrote:
> On Thu, Nov 07, 2019 at 03:02:20PM +0100, Stefan Hajnoczi wrote:
> > This documentation suggests that QEMU spawns the remote processes.  How
> > do this work with unprivileged QEMU?  Is there an additional step where
> > QEMU drops privileges after having spawned remote processes?
> > 
> > Remote processes require accesses to resources that the main QEMU
> > process does not need access to, so I'm wondering how this process model
> > ensures that each process has only the privileges it needs.
> 
> I guess you have something like capabilities in mind?

Or namespaces (unshare(2)).

> When using something like selinux, priviledges are per binary
> so the order of startup doesn't matter.

For static SELinux policies that make sense, thanks for explaining.

Does libvirt also perform dynamic (i.e. per-instance) SELinux
configuration?  I guess that cannot be associated with a specific binary
because multiple QEMU instances launch the same binary yet need to be
differentiated.

Stefan

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