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Re: [Qemu-devel] [PATCHv2 2/3] seccomp: adding command line support for

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [PATCHv2 2/3] seccomp: adding command line support for blacklist
Date: Wed, 11 Sep 2013 17:49:14 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On Wed, Sep 11, 2013 at 12:45:54PM -0400, Corey Bryant wrote:
> On 09/06/2013 03:21 PM, Eduardo Otubo wrote:
> >New command line options for the seccomp blacklist feature:
> >
> >  $ qemu -sandbox on[,strict=<on|off>]
> >
> >The strict parameter will turn on or off the new system call blacklist
> I mentioned this before but I'll say it again since I think it needs
> to be discussed.  Since this regresses support (it'll prevent -net
> bridge and -net tap from using execv) the concern I have with the
> strict=on|off option is whether or not we will have the flexibility
> to modify the blacklist once QEMU is released with this support.  Of
> course we should be able to add more syscalls to the blacklist as
> long as they don't regress QEMU functionality.  But if we want to
> add a syscall that does regress QEMU functionality, I think we'd
> have to add a new command line option, which doesn't seem desirable.
> So a more flexible approach may be necessary.  Maybe the blacklist
> should be passed on the command line, which would enable it to be
> defined by libvirt and passed to QEMU.  I know Paul is working on
> something for libvirt so maybe that answers this question.

On the face of it, I'm not at all a fan of the idea of libvirt having
to pass a syscall whitelist/blacklist to QEMU. IMHO that would be
exposing too much knowledge of QEMU impl details to libvirt.

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