linux-kernel - Re: [PATCH v10 05/11] seccomp: add system call filtering using BPF

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Message-ID: <CAObL_7H14aPuaMjSyoaxWxWzP_=9D1yDiO0EKk9LPi_8-GYeyw@mail.gmail.com>
Date:	Wed, 22 Feb 2012 15:51:40 -0800
From:	Andrew Lutomirski <luto@....edu>
To:	Indan Zupancic <indan@....nu>
Cc:	Will Drewry <wad@...omium.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	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, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, eparis@...hat.com,
	serge.hallyn@...onical.com, djm@...drot.org, scarybeasts@...il.com,
	pmoore@...hat.com, akpm@...ux-foundation.org, corbet@....net,
	eric.dumazet@...il.com, markus@...omium.org, keescook@...omium.org
Subject: Re: [PATCH v10 05/11] seccomp: add system call filtering using BPF

On Wed, Feb 22, 2012 at 3:46 PM, Indan Zupancic <indan@....nu> wrote:
> On Wed, February 22, 2012 20:47, Will Drewry wrote:
>> On Wed, Feb 22, 2012 at 8:23 AM, Ben Hutchings
>>> I would have thought the way to make sure the architecture is always
>>> checked is to pack it together with the syscall number.
>
> I missed that suggestion, putting the syscall number and arch in one
> data field would indeed make it harder to not check the arch.

Is there enough room?  On x86-64 at least, rax could conceivably be
extended to 64 bits some day.  Bit 30 is already spoken for by x32.

--Andy
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