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

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Message-ID: <CA+55aFyaVyUE7vif_VVcywG6YpBqVsY=qT0DsZiecNQnx_ddSQ@mail.gmail.com>
Date:	Fri, 13 Jan 2012 12:13:55 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
	keescook@...omium.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, luto@....edu, mingo@...e.hu,
	akpm@...ux-foundation.org, khilman@...com, borislav.petkov@....com,
	amwang@...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
Subject: Re: [PATCH] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from
 granting privs

On Fri, Jan 13, 2012 at 12:05 PM, Andy Lutomirski <luto@...capital.net> wrote:
>
> I'm confused.  The patch does "no security context changes on execve".

So that's what I wanted and thought you did, but your comment:

  "With my patch, selinux can already block the execve if it wants"

is what I reacted to. The "selinux *can*" and the "if it wants" part
was what made my hackles rise.

If it is not about what selinux can and what selinux wants, I'm happy.
The security manager shouldn't have any choices in the matter. No
'can', no 'want'.

Your choice of words made me think your patch had left that door open.

                 Linus
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