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| Subject: | Re: [Full-disclosure] Firefox 2.0.0.7 has a very serious calculation bug |
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| Date: | Fri, 28 Sep 2007 10:43:12 -0700 |
carl hardwick wrote:
PoC concept here: javascript:5.2-0.1 (copy this code into address bar) Firefox 2.0.0.7 result: 5.1000000000000005 (WRONG!) Internet Explorer 7 result: 5.1 (OK)
In IE7 and Opera I get the same thing you do for Firefox. This is not surprising because the ECMAScript specification says that floating point operations must comply with ANSI/IEEE Std 754-1985: IEEE Standard for Binary Floating-Point Arithmetic. The ECMAScript version 4 proposal introduces a decimal type intended to fix up some of weirdness caused by mapping base-2 floating point rounding back into base-10 notation. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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