linux-kernel - Re: Using ftrace/perf as a basis for generic seccomp

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Date:	Mon, 07 Feb 2011 13:26:09 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Stefan Fritsch <sf@...itsch.de>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Eric Paris <eparis@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org, agl@...gle.com, tzanussi@...il.com,
	Jason Baron <jbaron@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	2nddept-manager@....hitachi.co.jp,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	James Morris <jmorris@...ei.org>
Subject: Re: Using ftrace/perf as a basis for generic seccomp

On Sat, 2011-02-05 at 12:51 +0100, Stefan Fritsch wrote:

> A really major use case is socketcall(2). All socket related syscalls 
> (accept, bind, connect, receivemsg, ...) are implemented as socketcall 
> with an appropriate argument. There will be many cases where you want a 
> sandboxed process to be able to do recvmsg(2) to receive new file 
> descriptors over an already open unix-domain socket from a broker process. 
> But you may want to disallow other socket operations, especially listen, 
> accept, and connect.
> 
> Of course one could also add some special case handling for socketcall 
> in seccomp instead of using the full filtering.

That looks like a perfect use-case for the LSM bits, attach some state
to both the fd object and the task object and if they don't match, don't
allow the action.



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