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

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Message-ID: <20120118194420.GW11715@one.firstfloor.org>
Date:	Wed, 18 Jan 2012 20:44:20 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, 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!?

> 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

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.

-Andi
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