linux-kernel - Re: [PATCH v8 3/8] seccomp: add system call filtering using BPF

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Message-ID: <4F3DD84B.30808@zytor.com>
Date:	Thu, 16 Feb 2012 20:32:11 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Will Drewry <wad@...omium.org>
CC:	Eric Paris <eparis@...hat.com>,
	Markus Gutschke <markus@...omium.org>,
	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, mingo@...hat.com, oleg@...hat.com,
	peterz@...radead.org, rdunlap@...otime.net, mcgrathr@...omium.org,
	tglx@...utronix.de, luto@....edu, serge.hallyn@...onical.com,
	djm@...drot.org, scarybeasts@...il.com, indan@....nu,
	pmoore@...hat.com, akpm@...ux-foundation.org, corbet@....net,
	eric.dumazet@...il.com, keescook@...omium.org
Subject: Re: [PATCH v8 3/8] seccomp: add system call filtering using BPF

On 02/16/2012 08:26 PM, Will Drewry wrote:
>>
>> For x32 you have the option of introducing a new value or relying on bit
>> 30 in eax (and AUDIT_ARCH_X86_64).  The latter is more natural, probably.
> 
> Will that bit be visible as the syscall number or will it be stripped
> out before passing the number around?  If it's visible, then it
> doesn't seem like there'd need to be a new AUDIT_ARCH, but I suspect
> someone like Eric will have an actually useful opinion.
> 

Bit 30 is visible in orig_eax; whether you export it as part of "the
syscall number" is presumably TBD, but I think it's more natural to do so.

	-hpa

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

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