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Date: Tue, 6 Aug 2013 20:31:09 +0200
From: Oleg Nesterov <>
To: Andy Lutomirski <>
        Petr Matousek <>,
        "Eric W. Biederman" <>,
        Linus Torvalds <>
Subject: Re: CLONE_NEWUSER local DoS

On 08/06, Andy Lutomirski wrote:
> On Tue, Aug 6, 2013 at 9:47 AM, Oleg Nesterov <> wrote:
> >
> > I'll send the patch, but perhaps there is something else. Eric?
> I think that's right.  OTOH, it's not going to prevent this from OOMing:

Aaaah. user_ns_cachep I guess? ns->parent logic, yes??

I convinced myself this should be fine but it seems you are right.

IIUC, this needs another fix. Will try tomorrow. Not that I think
this needs my help ;)


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