full-disclosure - Re: Firefox 2.0.0.7 has a very serious calculation bug

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Message-Id: <20070929123515.80646DA81F@mailserver7.hushmail.com>
Date: Sat, 29 Sep 2007 08:35:15 -0400
From: <full-disclosure@...hmail.com>
To: <full-disclosure@...ts.grok.org.uk>,<rodrigob@...kover.org>
Subject: Re: Firefox 2.0.0.7 has a very serious
	calculation bug

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Not so much it required such a long thread.

On Fri, 28 Sep 2007 15:29:18 -0400 Rodrigo Barbosa
<rodrigob@...kover.org> wrote:
>On Fri, Sep 28, 2007 at 09:09:02PM +0200, Michal Zalewski wrote:
>> On Sat, 29 Sep 2007, Jimby Sharp wrote:
>>
>> > I don't get the same from C-style double arithmetics. Could
>you provide
>> > a sample code that you believe should show the same behavior?
>>
>> If you don't, it's presumably because the subtraction is
>optimized out by
>> the compiler, or because you printf() with an insufficient
>precision in
>> format spec. The following should do the trick:
>>
>> volatile double a = 5.2;
>> volatile double b = 0.1;
>> main() { printf("%.16lf\n",a-b); }
>
>Confirmed here with:
>
>gcc (GCC) 4.1.1 20070105 (Red Hat 4.1.1-52)
>
>Actually quite interesting.
>
>--
>Rodrigo Barbosa
>"Quid quid Latine dictum sit, altum viditur"
>"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)
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