linux-kernel - Re: [PATCH 13/19] y2038: add compat handling for sys

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Message-ID: <2124771.PTAe8S6R1g@wuerfel>
Date:	Sat, 16 May 2015 09:28:49 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	y2038@...ts.linaro.org, baolin.wang@...aro.org,
	albert.aribaud@...ev.fr, john.stultz@...aro.org,
	bamvor.zhangjian@...aro.org, ruchandani.tina@...il.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	libc-alpha@...rceware.org
Subject: Re: [PATCH 13/19] y2038: add compat handling for sys_semtimedop

On Saturday 16 May 2015 00:46:44 Thomas Gleixner wrote:
> On Wed, 6 May 2015, Arnd Bergmann wrote:
> > +SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
> > +             unsigned, nsops,
> > +             const struct __kernel_timespec  __user *, timeout)
> > +{
> > +     unsigned long jiffies_left = 0;
> > +
> > +     if (timeout) {
> > +             struct timespec64 _timeout;
> > +             if (get_timespec64(&_timeout, timeout))
> 
> Moo. I had to look 3 times to get not confused by the extra
> underscore. What's wrong with a proper variable name which is easy to
> distinguish?
> 
> > +                     return -EFAULT;
> 
> > +             if (_timeout.tv_sec < 0 || _timeout.tv_nsec < 0 ||
> > +                     _timeout.tv_nsec >= 1000000000L)
> > +                     return -EINVAL;
> 
> We have proper helper functions to validate time specs.

I tried to change the existing code as little as possible, but I agree
with your points here. I'll add a cleanup patch to fix the current code
before my own patches.

	Arnd
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