Date: Tue, 17 Mar 2009 14:39:49 -0400 (EDT)
From: Joe Malicki <jmalicki@metacarta.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: chrisw@sous-sol.org, akpm@linux-foundation.org,
       linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org,
       David Howells <dhowells@redhat.com>
Message-ID: <14026175.11106541237315189656.JavaMail.root@ouachita>
In-Reply-To: <3830454.11106421237315019351.JavaMail.root@ouachita>
Subject: Re: [PATCH] CRED: Fix check_unsafe_exec()
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----- "Hugh Dickins" <hugh@veritas.com> wrote:

> On Thu, 12 Mar 2009, David Howells wrote:
> > Hugh Dickins <hugh@veritas.com> wrote:
> > 
> > > We do.  See the original thread.  It's here at
> > > http://lkml.org/lkml/2009/2/26/233
> > > and appended below for convenience.  We do know that patch did
> not
> > > fix Joe's problem, and we don't yet know whether addressing the
> > > files->count issue will actually fix it, but I'm hopeful.
> > 
> > Looks reasonable.
> 
> Thanks for taking a look.
> 
> Yes, I'm inclined to go with that, and removing the files->count
> check from exec.c.  Joe, did you manage to try your testing with
> my original patch plus that files->count check removed from 2.6.28's
> unsafe_exec()?

Sorry for not responding earlier.

I still got one failure with this new patch.  I added some printks
to illuminate exactly why it's failing when it fails to setuid, but
of course, since adding the printks I haven't reproduced yet.
 
Very weird...

Thanks,
Joe

> Since Joe's bug has been around forever (if it is what we think it
> is), I'm disinclined to rush the fix - something nice to add to
> -stable, rather than needing to squeeze into 2.6.29.
> 
> Hugh
> 

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