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

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Message-ID: <18226.41032.912666.467900@cargo.ozlabs.ibm.com>
Date:	Thu, 8 Nov 2007 16:36:08 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	lkml@...idb.org, linux-kernel@...r.kernel.org, drepper@...hat.com,
	mtk-manpages@....net
Subject: Re: compat_sys_times() bogus until jiffies >= 0.

Andrew Morton writes:

> Yup.  But userspace will already have a fit if either the start or end time
> advanced into the glibc-thought-that-was-an-error range.

Not nearly as much of a fit.  The effect on x86 is that values between
-4095 and -1 are reported as -1, so the end-start difference will be
out by less than 41 seconds.  That's not nearly as dramatic as a
difference of 21 million seconds (over 16 years). :)

I really think that wrapping at 0x7fffffff makes the situation worse,
not better.

Paul.
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