linux-kernel - Re: BUG: Securityfs and bind mounts (2.6.34)

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Date:	Thu, 8 Jul 2010 16:32:42 +0100
From:	Tvrtko Ursulin <tvrtko.ursulin@...hos.com>
To:	Greg KH <greg@...ah.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: BUG: Securityfs and bind mounts (2.6.34)

On Thursday 08 Jul 2010 16:20:59 Greg KH wrote:
> > :) Well I do not know, but, it kind of smelled like a bug in the
> > : vfs/mount
> >
> > handling/securityfs area so I thought to let experts know. I _think_ I
> > did nothing that much wrong. Just used the exposed API
> > (securityfs_remove) and some bind mount shuffling from userspace.
>
> securitfs just uses libfs underneath it, and really doesn't have any
> bindings for module ownerships, so I wouldn't recommend doing what you
> just did.

Just do double check what you are saying, securityfs is not safe for use from
modules? If so I would then recommend removing the exports otherwise it is an
invitation to shoot yourself into the foot. Also, in-three TPM driver can be
built as a module so how does that work?

Tvrtko

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