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Date: Tue, 4 Aug 2009 00:57:53 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] posix-timers: fix oops in clock_nanosleep() with
 CLOCK_MONOTONIC_RAW
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On Tue, 04 Aug 2009 16:41:33 +0900 Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> wrote:

> Userspace program is like this;
> 
> #include <time.h>
> 
> int main(void)
> {
> 	struct timespec ts;
> 
> 	ts.tv_sec = 1;
> 	ts.tv_nsec = 0;
> 
> 	return clock_nanosleep(4, 0, &ts, NULL);
> }
> 
> and it will cause oops;
> 
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000001

Well that's not very good.

How far back does this go?  posix-timers.c hasn't changed in several
kernel versions.