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

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Message-ID: <20120120182214.GI2786@moon>
Date:	Fri, 20 Jan 2012 22:22:14 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>, david@...g.hm,
	Alexey Dobriyan <adobriyan@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	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 Fri, Jan 20, 2012 at 10:19:54PM +0400, Cyrill Gorcunov wrote:
> On Fri, Jan 20, 2012 at 08:57:11AM -0800, H. Peter Anvin wrote:
> > On 01/20/2012 08:29 AM, Cyrill Gorcunov wrote:
> > 
> > I would not worry about get_random_bytes() returning nothing... if
> > so, a lot of other places in the kernel would be broken.
> > 
> 
> Something like below?
> 
> 	Cyrill
> ---
...
> +
> +static __init int kcmp_cookie_init(void)
> +{
> +	int i, j;
> +
> +	for (i = 0; i < KCMP_TYPES; i++) {
> +		for (j = 0; j < 2; j++) {
> +			get_random_bytes(&cookies[i][j],
> +					 sizeof(cookies[i][j]));
> +			cookies[i][0] |= (~(~0UL >>  1) | 1);

Sigh, what a day. cookies[i][j]!

> +		}
> +	}
> +
> +	return 0;
> +}

	Cyrill
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