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Date:   Mon, 11 Dec 2017 08:52:43 -0800
From:   Casey Schaufler <>
To:     Eric Paris <>,
        Mickaël Salaün <>,
        Richard Guy Briggs <>,,
        Linux Containers <>,
        Linux API <>,
        Linux Audit <>,
        Linux FS Devel <>,
        Linux Kernel <>,
        Linux Network Development <>
Cc:, "Eric W. Biederman" <>,
        Simo Sorce <>,,
        Carlos O'Donell <>,
        David Howells <>,
        Al Viro <>,
        Andy Lutomirski <>,
        Eric Paris <>,,
        Michael Kerrisk <>
Subject: Re: RFC(v2): Audit Kernel Container IDs

On 12/11/2017 8:30 AM, Eric Paris wrote:
> On Sat, 2017-12-09 at 10:28 -0800, Casey Schaufler 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? Did this command run in it's own 'container'
> unrelated to the 'docker-like' container?

Jose Bollo's PTAGS ( ) would be
prefect. Any time you declare something to be a container or
enter a namespace you slap a tag on it. Identifying nested
containers would be easy, you'd have multiple tags.

PTAGS unfortunately needs module stacking, but how hard could that be?

> -Eric

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