linux-kernel - Re: [PATCH] posix-timers: fix oops in clock_nanosleep() with CLOCK_MONOTONIC

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Message-ID: <4A77EC0A.1040602@ct.jp.nec.com>
Date:	Tue, 04 Aug 2009 17:06:34 +0900
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] posix-timers: fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW

Andrew Morton wrote:
> On Tue, 04 Aug 2009 16:41:33 +0900 Hiroshi Shimamoto <h-shimamoto@...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.

Not sure the exact version is. I've just noticed it on the latest git and
Fedora 11.
I guess after the below commit;
commit 2d42244ae71d6c7b0884b5664cf2eda30fb2ae68
Author: John Stultz <johnstul@...ibm.com>
Date:   Wed Aug 20 16:37:30 2008 -0700

    clocksource: introduce CLOCK_MONOTONIC_RAW

thanks,
Hiroshi
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