linux-kernel - Re: [PATCH 1/4] proc: fix NULL ->i

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Date:	Tue, 20 Nov 2007 15:17:31 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Alexey Dobriyan <adobriyan@...ru>, akpm@...l.org,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	devel@...nvz.org, James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...isplace.org>
Subject: Re: [PATCH 1/4] proc: fix NULL ->i_fop oops

On Tue, Nov 20, 2007 at 10:05:05AM -0500, Stephen Smalley wrote:
> > Nice, getting rid of this is a very good step formwards.  Unfortunately
> > we have another copy of this junk in
> > security/selinux/selinuxfs.c:sel_remove_entries() which would need the
> > same treatment.
> 
> Can't just be dropped completely for selinux - we need a way to drop
> obsolete entries from the prior policy when we load a new policy.
> 
> Is the only real problem here the clearing of f_op?  If so, we can
> likely remove that from sel_remove_entries() without harm, and fix the
> checks for it to use something more reliable.

f_op removal is the biggest issue.  It can't really work and this is the
last instance.  But in general having some half-backed attempts at revoke
is never a good idea.
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