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Date:	Wed, 22 Feb 2012 17:07:05 -0800
From:	"H. Peter Anvin" <>
To:	Andrew Lutomirski <>
CC:	Indan Zupancic <>, Will Drewry <>,
	Ben Hutchings <>,,,,,,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH v10 05/11] seccomp: add system call filtering using BPF

On 02/22/2012 03:51 PM, Andrew Lutomirski wrote:
> 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.

No it couldn't, because we mask off the high 32 bits and thus it could
(theoretically) break user space.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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