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Message-ID: <5826e69c77b387b97886dc3619f14c30.squirrel@webmail.greenhost.nl>
Date: Thu, 23 Feb 2012 01:08:12 +0100
From: "Indan Zupancic" <indan@....nu>
To: "Andrew Lutomirski" <luto@....edu>
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,
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arnd@...db.de,
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serge.hallyn@...onical.com,
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keescook@...omium.org
Subject: Re: [PATCH v10 05/11] seccomp: add system call filtering using BPF
On Thu, February 23, 2012 00:51, Andrew Lutomirski wrote:
> 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.
No, there isn't.
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