linux-kernel - Re: [PATCH] Fix half-Y2K38 problem in timecompare

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Date:	Wed, 6 Jan 2010 11:18:37 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	akpm@...ux-foundation.org, davem@...emloft.net,
	patrick.ohly@...el.com, uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix half-Y2K38 problem in timecompare_update while 
	calculating offset

It has been merged into mainline:

timecompare: fix half-Y2K38 problem in timecompare_update while
calculating offset
author	Barry Song <21cnbao@...il.com>	
	Wed, 16 Dec 2009 00:45:34 +0000 (16:45 -0800)
committer	Linus Torvalds <torvalds@...ux-foundation.org>	
	Wed, 16 Dec 2009 15:19:57 +0000 (07:19 -0800)
commit	f065f41f48569122b5bcddbd1ba2354f7cc29fdc
tree	68606305bfb3aba16437017e0596ccae11e6f6db	tree | snapshot
parent	4365a5676fa3aa1d5ae6c90c22a0044f09ba584e	commit | diff
timecompare: fix half-Y2K38 problem in timecompare_update while
calculating offset

ktime will overflow from 03:14:07 UTC on Tuesday, 19 January 2038,
ktime_add() in timecompare_update() will overflow a half earlier.  As a
result, wrong offset will be gotten, then cause some strange problems.

Signed-off-by: Barry Song <21cnbao@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Patrick Ohly <patrick.ohly@...el.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: John Stultz <johnstul@...ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>


On Wed, Jan 6, 2010 at 3:28 AM, Mike Frysinger <vapier.adi@...il.com> wrote:
> On Tue, Sep 29, 2009 at 21:44, Mike Frysinger wrote:
>> On Mon, Sep 28, 2009 at 06:16, Barry Song wrote:
>>> ktime will overflow from 03:14:07 UTC on Tuesday, 19 January 2038,
>>> ktime_add() in timecompare_update() will overflow a half earlier.
>>> As a result, wrong offset will be gotten, then cause some strange
>>> problems.
>>
>> Barry: you forgot to include your s-o-b tag ...
>
> you still need to post your s-o-b if we want this to go any further
> -mike
>
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