linux-kernel - Re: [PATCH] exec: do not leave bprm->interp on stack

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Message-ID: <alpine.LFD.2.02.1211161804520.16891@wniryva.cad.erqung.pbz>
Date:	Fri, 16 Nov 2012 18:20:39 +0530 (IST)
From:	P J P <ppandit@...hat.com>
To:	Kees Cook <keescook@...omium.org>
cc:	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Josh Triplett <josh@...htriplett.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	linux-fsdevel@...r.kernel.org, halfdog <me@...fdog.net>
Subject: Re: [PATCH] exec: do not leave bprm->interp on stack


  Hello folks,

+-- On Mon, 12 Nov 2012, Kees Cook wrote --+
| >   Al, what's your take on the *rare* extra call to request_module?
| 
| Without any other feedback, I'd like to use my minimal allocation
| patch, since it fixes the problem and doesn't change any of the
| semantics of how/when loading happens.

  I did apply and test this patch with kernel-3.5.3 on my machine. Now it 
seems to disclose dynamically allocated(kstrdup) bytes, instead of the call 
stack bytes. Recursions still dodge and exceed the limit of 
BINPRM_MAX_RECURSION(4).

Please pardon my asking, but - how is this a fix?
--
Prasad J Pandit / Red Hat Security Response Team
DB7A 84C5 D3F9 7CD1 B5EB  C939 D048 7860 3655 602B
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