linux-kernel - Re: [RFC PATCH 0/3] move the secure

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Message-ID: <4FBECAC2.6050303@zytor.com>
Date:	Thu, 24 May 2012 16:56:50 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Lutomirski <luto@....edu>
CC:	James Morris <jmorris@...ei.org>, Will Drewry <wad@...omium.org>,
	linux-kernel@...r.kernel.org, mcgrathr@...gle.com, indan@....nu,
	netdev@...isplace.org, linux-security-module@...r.kernel.org,
	kernel-hardening@...ts.openwall.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	tglx@...utronix.de, serge.hallyn@...onical.com, pmoore@...hat.com,
	akpm@...ux-foundation.org, corbet@....net, markus@...omium.org,
	coreyb@...ux.vnet.ibm.com, keescook@...omium.org,
	viro@...iv.linux.org.uk
Subject: Re: [RFC PATCH 0/3] move the secure_computing call

On 05/24/2012 04:43 PM, Andrew Lutomirski wrote:
> 
> IMO the behavior should change.  Alternatively, a post-ptrace syscall
> should have to pass the *tracer's* seccomp filter, but that seems
> overcomplicated and confusing.
> 
> OTOH, allowing ptrace in a seccomp filter is asking for trouble anyway
> -- if you can ptrace something outside the sandbox, you've escaped.
> 

This is my suggestion: if there is demand, make it possible to install a
*second* seccomp filter program which is run on the result of the
ptrace.  I.e.:

Untraced:	process -> seccomp1 -> kernel

Traced:		process -> seccomp1 -> ptrace -> seccomp2 -> kernel

This is something we could add later if there is demand.

	-hpa


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