linux-kernel - Re: [PATCH] timekeeping: Limit system time to prevent 32-bit time

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Message-ID: <20151008093923.GQ5778@localhost>
Date:	Thu, 8 Oct 2015 11:39:23 +0200
From:	Miroslav Lichvar <mlichvar@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, y2038@...ts.linaro.org,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Prarit Bhargava <prarit@...hat.com>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH] timekeeping: Limit system time to prevent 32-bit time_t
 overflow

On Thu, Oct 08, 2015 at 10:52:05AM +0200, Arnd Bergmann wrote:
> On Thursday 08 October 2015 08:23:44 Miroslav Lichvar wrote:
> > The difference is that with the one-week step the kernel and userspace
> > still agree on the current time and it is always valid from the kernel
> > point of view, absolute timers can be set, etc.
> 
> Ok, I can see that as an improvement, but it still seems to give
> a false sense of safety, and I feel we really should not have any code
> rely on this behavior.

Applications are not allowed to rely on system time being sane?
To me the current behavior looks like the kernel is throwing the
applications off a cliff, while it's the only thing that can fly :).

-- 
Miroslav Lichvar
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