linux-kernel - Re: [PATCH v8 3/8] seccomp: add system call filtering using BPF

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Message-ID: <4F3DA2BC.7010706@zytor.com>
Date:	Thu, 16 Feb 2012 16:43:40 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Will Drewry <wad@...omium.org>
CC:	Markus Gutschke <markus@...omium.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, mingo@...hat.com, oleg@...hat.com,
	peterz@...radead.org, rdunlap@...otime.net, mcgrathr@...omium.org,
	tglx@...utronix.de, luto@....edu, eparis@...hat.com,
	serge.hallyn@...onical.com, djm@...drot.org, scarybeasts@...il.com,
	indan@....nu, pmoore@...hat.com, akpm@...ux-foundation.org,
	corbet@....net, eric.dumazet@...il.com, keescook@...omium.org
Subject: Re: [PATCH v8 3/8] seccomp: add system call filtering using BPF

On 02/16/2012 03:00 PM, Will Drewry wrote:
>
> Without the addition of x32, it is still the intersection of
> is_compat_task()/TS_COMPAT and CONFIG_64BIT for all arches to
> determine if the call is 32-bit or 64-bit, but this will add another
> wrinkle.  Would it make sense to assume that system call namespaces
> may be ever expanding and offer up an unsigned integer value?
>

This is definitely the most general solution.

By the way, although most processes only use one set of system calls, 
there are legitimate reasons for cross-mode tasks, and those probably 
have a high overlap with the ones that would benefit from this kind of 
filtering facility, e.g. pin.

	-hpa

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