linux-kernel - Re: [RFC] syscalls, x86: Add __NR

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Message-ID: <4F15C249.3000602@zytor.com>
Date:	Tue, 17 Jan 2012 10:47:37 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Alexey Dobriyan <adobriyan@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrey Vagin <avagin@...nvz.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>, Tejun Heo <tj@...nel.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Valdis.Kletnieks@...edu
Subject: Re: [RFC] syscalls, x86: Add __NR_kcmp syscall

On 01/17/2012 06:44 AM, Cyrill Gorcunov wrote:
> On Tue, Jan 17, 2012 at 04:38:14PM +0200, Alexey Dobriyan wrote:
>> On 1/17/12, Cyrill Gorcunov <gorcunov@...il.com> wrote:
>>> +#define KCMP_EQ		0
>>> +#define KCMP_LT		1
>>> +#define KCMP_GT		2
>>
>> LT and GT are meaningless.
>>
> 
> I found symbolic names better than open-coded values. But sure,
> if this is problem it could be dropped.
> 
> Or you mean that in general anything but 'equal' is useless?
> 

Why on Earth would user space need to know which order in memory certain
kernel objects are?

Keep in mind that this is *exactly* the kind of information which makes
rootkits easier.

	-hpa

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

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