linux-kernel - Re: NFS4 authentification / fsuid

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Date:	Thu, 30 Aug 2007 10:32:17 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: NFS4 authentification / fsuid

On Thu, 2007-08-30 at 10:29 -0400, Trond Myklebust wrote:
> We've got people working on fixing this problem using David Howells'
> keyrings, but it will probably be a while until we've solved all the
> upcall issues, and it will probably take even longer to push the
> kerberos changes back to the official MIT etc distros.

BTW: even when this task is done, a creative root can still find ways to
subvert the security (he can read /dev/mem, replace the kernel with a
compromised one, ....). The bottom line is that if you can't trust root,
don't even log in.

Trond

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