linux-kernel - Re: [PATCH] CRED: Fix check_unsafe

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Date:	Tue, 17 Mar 2009 14:39:49 -0400 (EDT)
From:	Joe Malicki <jmalicki@...acarta.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	chrisw@...s-sol.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH] CRED: Fix check_unsafe_exec()

----- "Hugh Dickins" <hugh@...itas.com> wrote:

> On Thu, 12 Mar 2009, David Howells wrote:
> > Hugh Dickins <hugh@...itas.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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