linux-kernel - Re: [PATCH][RFC] security: constify seq

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Message-ID: <20090811212842.4291eba0@infradead.org>
Date:	Tue, 11 Aug 2009 21:28:42 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH][RFC] security: constify seq_operations

On Tue, 11 Aug 2009 09:36:43 -0500
"Serge E. Hallyn" <serue@...ibm.com> wrote:

> Quoting James Morris (jmorris@...ei.org):
> > I think it'd be a good idea to constify more of the various
> > operations structs in the kernel -- our coverage of this is spotty.
> > 
> > The patch below should provide coverage for all of the eligible 
> > seq_operations structs in the kernel.  It's derived from the
> > grsecurity patch (which I was reading and noticed how many of these
> > we're missing).
> > 
> > It's possible something's been missed, or that there are problems
> > in code which I can't test.  Please review/comment/test.
> > 
> > If it looks ok, I suggest pushing this via -mm.
> > 
> > Note that there are quite a few other similar ops to be constified,
> > such as file_operations, so if anyone would like to pitch in,
> > please do so.
> > 
> > ---
> > 
> > Subject: [PATCH 1/1] security: constify seq_operations
> > 
> > Make all seq_operations structs const, to help mitigate
> > against revectoring user-triggerable function pointers.
> > 
> > This is derived from the grsecurity patch, although generated
> > from scratch because it's simpler than extracting the changes
> > from there.
> > 
> > Signed-off-by: James Morris <jmorris@...ei.org>
> 
> I think it's a good idea.
> 
> I suppose we could add a script to check for any new
> seq_ops structs not constified...  something as simple as
> find . -type f -print0 | xargs -0 grep 'struct seq_operations' | grep
> -v const Though what you have here hits all of those and more.
> 
that's what checkpatch.pl is for
(afaik it does that already for file_operations)


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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