linux-kernel - Re: [Y2038] [PATCH v4 06/25] time/posix-timers:Introduce {get, put}_timespec and {get, put}

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Message-ID: <alpine.DEB.2.11.1506051159110.4155@nanos>
Date:	Fri, 5 Jun 2015 11:59:35 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Arnd Bergmann <arnd@...db.de>
cc:	y2038@...ts.linaro.org, Baolin Wang <baolin.wang@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [Y2038] [PATCH v4 06/25] time/posix-timers:Introduce {get,
 put}_timespec and {get, put}_itimerspec

On Thu, 4 Jun 2015, Arnd Bergmann wrote:
> int get_timespec64(struct timespec64 *ts, const struct timespec __user *uts)
> {
> 	struct timespec64 tmp;
> 	int ret;
> 
> 	if (sizeof(tmp) == sizeof(*ts))
> 		return copy_from_user(&tmp, uts, sizeof(*ts)) ? -EFAULT : 0;
> 
> 	ret = copy_from_user(&tmp, uts, sizeof(*ts));
> 	if (ret)
> 		return -EFAULT;
> 
> 	ts->tv_sec = tmp.tv_sec;
> 	ts->tv_nsec = tmp.tv_nsec;
> 
> 	return 0;
> }
> 
> This works fine, but I'd have to change it to copy from a __user
> __kernel_timespec instead of timespec in my system call series, and
> in order to do that, we must ensure that I can change over all callers
> at the same time, so with the function prototype above, we should not
> start using get_timespec64 for anything outside of posix-timers.c.

That's fine I think.

Thanks,

	tglx
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