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

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Message-ID: <CA+55aFwWXqjq=J0R2zfsRuHYBatC19KP6GJqiETS2LKToEPN9w@mail.gmail.com>
Date:	Wed, 18 Jan 2012 11:47:54 -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 11:44 AM, Andi Kleen <andi@...stfloor.org> wrote:
>
> It can securely enable syscall auditing which can catch all syscalls
> (however you only get race free memory arguments for the ones with LSM hooks
> at the right place). Really need both.
>
> I agree it's not easy to get tight (and also not pretty), but you have a lot
> better chance doing it this way than with ptrace.

.. And how the f*^& did you imagine that something like chrome would do that?

You need massive amounts of privileges, and it's a total disaster in
every single respect.

Stop pushing crap. No, ptrace isn't wonderful, but your LSM+auditing
idea is a billion times worse in all respects.

We can definitely fix the ptrace issue with compat system calls.

THERE IS NO WAY IN HELL YOU CAN EVER FIX LSM+AUDIT TO BE USABLE!

Stop bothering to even bring it up. It's dead, Jim.

               Linus
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