netdev - Re: [PATCH v2 net-next 3/3] ARM: net: bpf_jit_32: support BPF_S_ANC_SECCOMP_LD

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Date:	Mon, 29 Apr 2013 14:39:29 +0200
From:	Nicolas Schichan <nschichan@...ebox.fr>
To:	Xi Wang <xi.wang@...il.com>
CC:	Daniel Borkmann <dborkman@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Will Drewry <wad@...omium.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	David Laight <david.laight@...lab.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 net-next 3/3] ARM: net: bpf_jit_32: support BPF_S_ANC_SECCOMP_LD_W
 instruction

On 04/27/2013 08:32 PM, Xi Wang wrote:
> On Sat, Apr 27, 2013 at 2:27 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
>> Arent't you doing here a similar thing in terms of getting arch as Eric
>> criticized (Nicolas' implementation does not use that part btw.)? Also,
>> even if it would be possible here, now your 2 JIT implementations differ
>> in behaviour. I think this is unintended.
>
> Eric's comment was about x86, where the audit arch could change on the
> fly.  For ARM, the audit arch doesn't change---syscall_get_arch()
> always returns AUDIT_ARCH_ARM.

Hi,

Indeed, syscall_get_arch() will only return AUDIT_ARCH_ARM on ARM right now. 
This might be more future proof to call syscall_get_arch() though. The main 
reason that comes to my mind would be an AArch64 kernel with support for 
AArch32 userland tasks. This would I expect require a different AUDIT_ARCH 
constant to differenciate between AArch64 and AArch32 tasks.

Regards,

-- 
Nicolas Schichan
Freebox SAS
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