linux-kernel - Re: [PATCH v17 01/15] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privs

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Date:	Fri, 6 Apr 2012 13:54:19 -0700
From:	Andrew Lutomirski <luto@....edu>
To:	Markus Gutschke <markus@...omium.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, eparis@...hat.com,
	serge.hallyn@...onical.com, djm@...drot.org, scarybeasts@...il.com,
	indan@....nu, pmoore@...hat.com, corbet@....net,
	eric.dumazet@...il.com, coreyb@...ux.vnet.ibm.com,
	keescook@...omium.org, jmorris@...ei.org,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v17 01/15] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve
 from granting privs

On Fri, Apr 6, 2012 at 1:47 PM, Markus Gutschke <markus@...omium.org> wrote:
> On Fri, Apr 6, 2012 at 12:49, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> On Thu, 29 Mar 2012 15:01:46 -0500
>> Will Drewry <wad@...omium.org> wrote:
>>> From: Andy Lutomirski <luto@...capital.net>
>>> 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.
>
> I don't want to derail things. So, tell me to go away, if I can't have
> what I want.
>
> Having said that, it would be great if NO_NEW_PRIVS also gave access
> to the restricted clone() flags. Such as CLONE_NEWIPC, CLONE_NEWNET
> and CLONE_NEWPID.

I decided to hold off on extra controversy for awhile.  However:

https://git.kernel.org/?p=linux/kernel/git/luto/linux.git;a=commit;h=9a520b74ad5dc14a3d6950b6d63a64714adbdd7d
and
http://web.mit.edu/luto/www/linux/nnp/newns.c

I fully intend to resurrect both of those once nnp lands.

(FWIW, I think that CLONE_NEWPID interacts badly with unix socket
credentials and should be fixed as a prerequisite for making it easier
to access.)

--Andy
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