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Date:	Wed, 22 Feb 2012 15:51:40 -0800
From:	Andrew Lutomirski <>
To:	Indan Zupancic <>
Cc:	Will Drewry <>,
	Ben Hutchings <>,,,,,,,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH v10 05/11] seccomp: add system call filtering using BPF

On Wed, Feb 22, 2012 at 3:46 PM, Indan Zupancic <> 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.

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