linux-kernel - Re: [RFC PATCH 02/27] containers: Implement containers as kernel objects

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Date:   Tue, 19 Feb 2019 23:13:16 +0000
From:   David Howells <dhowells@...hat.com>
To:     ebiederm@...ssion.com (Eric W. Biederman)
Cc:     dhowells@...hat.com, keyrings@...r.kernel.org,
        trond.myklebust@...merspace.com, sfrench@...ba.org,
        linux-security-module@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        rgb@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/27] containers: Implement containers as kernel objects

Eric W. Biederman <ebiederm@...ssion.com> wrote:

> > +	c->id = atomic64_inc_return(&container_id_counter);
> 
> This id is not in a namespace, and it doesn't have enough bits
> of entropy to be globally unique.   Not that 64bit is enough
> to have a chance at being globablly unique.

It's in a container, so it doesn't need to be in a namespace.  The intended
purpose is for annotating audit messages.  Globally unique wasn't particularly
in mind.  It could be turned into, say, a uuid, so that isn't really a problem
at this point.

You are right, though, it really should be globally unique as best possible -
even the one in init_container should be.  Ideally, it would look the same
inside the root container as any subcontainer.

David