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

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Message-ID: <CAObL_7E7dHWxKgA7-pSCuUCrxEqY1H55Kxg_sF_OLbdx=pkT4g@mail.gmail.com>
Date:	Fri, 6 Apr 2012 14:15:19 -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 2:04 PM, Markus Gutschke <markus@...omium.org> wrote:
> On Fri, Apr 6, 2012 at 13:54, Andrew Lutomirski <luto@....edu> wrote:
>> (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.)
>
> sendmsg() is a big hair ball. And yes, I have all sorts of things on
> my wish list that touch sendmsg(). I don't think, I'll get them
> fullfilled anytime soon, though:
>
>  - sendmsg() does lots of different things: sending on unconnected
> sockets, sending file descriptors, sending unix decriptors, and
> plain-old sending data. These operations have very different security
> properties and implications. It would be awesome if BPF filters could
> filter these different types of operations selectively.
>
>  - ancillary data is a cool concept in general. We should use it more.
> If I could send a memory mapping from one process to another, that
> would solve so many problems. But I know, I am dreaming; I don't
> expect to see this feature any time soon.
>

Agreed, but I'm talking about something totally different: if I can
use CLONE_NEWPID, then I can send an unexpected pid with SCM_CREDS.
The SCM_CREDS receive code should remap pids.

--Andy
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