linux-kernel - Re: RFC(v2): Audit Kernel Container IDs

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Date:   Mon, 11 Dec 2017 14:37:05 -0500
From:   Steve Grubb <sgrubb@...hat.com>
To:     linux-audit@...hat.com
Cc:     Eric Paris <eparis@...hat.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Richard Guy Briggs <rgb@...hat.com>, cgroups@...r.kernel.org,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Network Development <netdev@...r.kernel.org>
Subject: Re: RFC(v2): Audit Kernel Container IDs

On Monday, December 11, 2017 11:30:57 AM EST Eric Paris wrote:
> > Because a container doesn't have to use namespaces to be a container
> > you still need a mechanism for a process to declare that it is in
> > fact
> > in a container, and to identify the container.
> 
> I like the idea but I'm still tossing it around in my head (and
> thinking about Casey's statement too). Lets say we have a 'docker-like'
> container with pid=100  netns=X,userns=Y,mountns=Z. If I'm on the host
> in all init namespaces and I run
>   nsenter -t 100 -n ip link set eth0 promisc on
> How should this be logged?

If it is a normal process, then everything would match the init name space and 
you wouldn't have entered a container. If it were a container, any generated 
event should have the container ID from registration attached to it.

> Did this command run in it's own 'container' unrelated to the 'docker-like'
> container?

That should be determined by what's in the task struct.

-Steve