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

From: Eduardo Otubo
Subject: Re: [Qemu-devel] [PATCHv2 2/3] seccomp: adding command line support for blacklist
Date: Tue, 17 Sep 2013 17:16:49 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130806 Thunderbird/17.0.8

On 09/17/2013 04:17 PM, Corey Bryant wrote:

On 09/17/2013 01:14 PM, Eduardo Otubo wrote:

On 09/17/2013 11:43 AM, Paul Moore wrote:
On Tuesday, September 17, 2013 02:06:06 PM Daniel P. Berrange wrote:
On Tue, Sep 17, 2013 at 10:01:23AM -0300, Eduardo Otubo wrote:

Paul, what exactly are you planning to add to libvirt? I'm not a big
fan of using qemu command line to pass syscalls for blacklist as
arguments, but I can't see other way to avoid problems (like -net
bridge / -net tap) from happening.

At present, and as far as I'm concerned pretty much everything is open
discussion, the code works similar to the libvirt network filters.
You create
a separate XML configuration file which defines the filter and you
that filter from the domain's XML configuration.  When a QEMU/KVM or
LXC based
domain starts it uses libseccomp to create the seccomp filter and then
it into the kernel after the fork but before the domain is exec'd.

Clever approach. I tihnk a possible way to do this is something like:



[,whitelist=qemu_whitelist.conf] will override default whitelist filter
[,blacklist=blacklist.conf] will override default blacklist filter

But when we add seccomp support for qemu on libvirt, we make sure to
just add -sandbox off and use Paul's approach.

Is that a reasonable approach? What do you think?

QEMU wouldn't require any changes for the approach Paul describes. The
QEMU process that is exec'd by libvirt would be constrained by the
filter that libvirt installed.

Yes, that is correct. But I'm thinking about the case when Qemu is run stand-alone, without libvirt. There must be a way to configure it without using a pre configured filter from libvirt.

Eduardo Otubo
IBM Linux Technology Center

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