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Re: [Qemu-devel] [PATCH] seccomp: adding a second whitelist

From: Eduardo Otubo
Subject: Re: [Qemu-devel] [PATCH] seccomp: adding a second whitelist
Date: Tue, 03 Sep 2013 17:07:53 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130621 Thunderbird/17.0.7

On 09/03/2013 03:21 PM, Paul Moore wrote:
On Tuesday, September 03, 2013 02:08:28 PM Corey Bryant wrote:
On 09/03/2013 02:02 PM, Corey Bryant wrote:
On 08/30/2013 10:21 AM, Eduardo Otubo wrote:
On 08/29/2013 05:34 AM, Stefan Hajnoczi wrote:
On Wed, Aug 28, 2013 at 10:04:32PM -0300, Eduardo Otubo wrote:
Now there's a second whitelist, right before the vcpu starts. The
whitelist is the same as the first one, except for exec() and select().

-netdev tap,downscript=/path/to/script requires exec() in the QEMU
shutdown code path.  Will this work with seccomp?

I actually don't know, but I'll test that as well. Can you run a test
with this patch and -netdev? I mean, if you're pointing that out you
might have a scenario already setup, right?


This uses exec() in net/tap.c.

I think if we're going to introduce a sandbox environment that restricts
existing QEMU behavior, then we have to introduce a new argument to the
-sandbox option.  So for example, "-sandbox on" would continue to use
the whitelist that allows everything in QEMU to work (or at least it
should :).  And something like "-sandbox on,strict=on" would use the
whitelist + blacklist.

If this is acceptable though, then I wonder how we could go about adding
new syscalls to the blacklist in future QEMU releases without regressing
"-sandbox on,strict=on".

Maybe a better approach is to provide support that allows libvirt to
define the blacklist and pass it to QEMU?

FYI: I didn't want to mention this until I had some patches ready to post, but
I'm currently working on adding syscall filtering, via libseccomp, to libvirt.
I hope to get an initial RFC-quality patch out "soon".

Paul, if you need any help with Qemu and/or testing, please let me know. I would be glad to help :) When you post your RFC to libvirt mailing list please add me as CC.

Eduardo Otubo
IBM Linux Technology Center

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