linux-kernel - Re: [PATCH v3 1/4] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privs

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Message-ID: <CAGXu5j+JfTHFZUgYw7vCkBajTyfG4jP19-KLCtOw9cMuymUKjQ@mail.gmail.com>
Date:	Wed, 1 Feb 2012 10:14:31 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jamie Lokier <jamie@...reable.org>,
	john.johansen@...onical.com, serge.hallyn@...onical.com,
	coreyb@...ux.vnet.ibm.com, pmoore@...hat.com, eparis@...hat.com,
	djm@...drot.org, segoon@...nwall.com, rostedt@...dmis.org,
	jmorris@...ei.org, scarybeasts@...il.com, avi@...hat.com,
	penberg@...helsinki.fi, viro@...iv.linux.org.uk, mingo@...e.hu,
	akpm@...ux-foundation.org, khilman@...com, borislav.petkov@....com,
	amwang@...hat.com, oleg@...hat.com, ak@...ux.intel.com,
	eric.dumazet@...il.com, gregkh@...e.de, dhowells@...hat.com,
	daniel.lezcano@...e.fr, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, olofj@...omium.org,
	mhalcrow@...gle.com, dlaor@...hat.com, corbet@....net,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH v3 1/4] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve
 from granting privs

On Mon, Jan 30, 2012 at 8:17 AM, Andy Lutomirski <luto@...capital.net> wrote:
> With this set, a lot of dangerous operations (chroot, unshare, etc)
> become a lot less dangerous because there is no possibility of
> subverting privileged binaries.
>
> This patch completely breaks apparmor.  Someone who understands (and
> uses) apparmor should fix it or at least give me a hint.
>
> Signed-off-by: Andy Lutomirski <luto@...capital.net>

Looking forward to this -- it'll give us a lot more flexibility.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook
ChromeOS Security
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