linux-kernel - Re: Compat 32-bit syscall entry from 64-bit task!?

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Message-ID: <CA+55aFz+NNf3SrAdno72EEVbhM-tgBcwjz0ao3TLiOSJR-yJoQ@mail.gmail.com>
Date:	Wed, 18 Jan 2012 11:39:41 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Indan Zupancic <indan@....nu>, Jamie Lokier <jamie@...reable.org>,
	Andrew Lutomirski <luto@....edu>,
	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, 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,
	Roland McGrath <mcgrathr@...omium.org>
Subject: Re: Compat 32-bit syscall entry from 64-bit task!?

On Wed, Jan 18, 2012 at 11:36 AM, Andi Kleen <andi@...stfloor.org> wrote:
>
> The real fix is really to use a LSM for custom jails.  Trying to make
> ptrace secure is trying to make a sieve wather tight by plugging the individual
> holes one by one. It's simply not suitable for this.

Umm. But the exact same is true of "LSM for custom jail". It's a
f*&^ing disaster, and it's a whole lot more complicated than ptrace.

Plus it can't even do what ptrace does, so what's the point?  There's
a lot of system calls that don't have any kind of lsm hooks, and
shouldn't. Exactly because THAT is a "plugging individual holes one by
one" approach.

                     Linus
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