linux-kernel - Re: compat_sys_times() bogus until jiffies >= 0.

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Message-Id: <20071107171742.ee4a1401.akpm@linux-foundation.org>
Date:	Wed, 7 Nov 2007 17:17:42 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andreas Schwab <schwab@...e.de>
Cc:	lkml@...idb.org, linux-kernel@...r.kernel.org, drepper@...hat.com,
	mtk-manpages@....net
Subject: Re: compat_sys_times() bogus until jiffies >= 0.

> On Thu, 08 Nov 2007 01:54:40 +0100 Andreas Schwab <schwab@...e.de> wrote:
> Andrew Morton <akpm@...ux-foundation.org> writes:
> 
> > diff -puN kernel/compat.c~a kernel/compat.c
> > --- a/kernel/compat.c~a
> > +++ a/kernel/compat.c
> > @@ -162,7 +162,8 @@ asmlinkage long compat_sys_times(struct 
> >  		if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
> >  			return -EFAULT;
> >  	}
> > -	return compat_jiffies_to_clock_t(jiffies);
> > +	return compat_jiffies_to_clock_t((jiffies + INITIAL_JIFFIES) &
> > +						LONG_MAX);
> 
> Are you sure you want LONG_MAX here, not 0x7fffffff?
> 

I'm not sure of anything - I'm just trolling ;)

That's 0x7fffffffffffffff for architectures which implement this function. 
I think that lines up correctly with jiffies and the return value from
compat_sys_times().

Perhaps formally it should be USERSPACE_CLOCK_T_MAX, but we don't have that.
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