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Date: Fri, 28 Sep 2007 19:22:35 +0200 (CEST) From: Michal Zalewski <lcamtuf@...ne.cc> To: carl hardwick <hardwick.carl@...il.com> Cc: full-disclosure@...ts.grok.org.uk Subject: Re: Firefox 2.0.0.7 has a very serious calculation bug On Fri, 28 Sep 2007, carl hardwick wrote: > javascript:5.2-0.1 > Firefox 2.0.0.7 result: 5.1000000000000005 (WRONG!) This is a proper behavior of IEEE 754 64-bit double float, which, IIRC, is precisely what ECMA standard mandates. You will get the same from any C-style 'double' arithmetics. > Internet Explorer 7 result: 5.1 (OK) They use a marginally higher precision. Now try 5.002-.001 - chances are, you will get 5.00999... Neither is a "very serious calculation bug". Javascript does not guarantee - and nowhere actually delivers - arbitrary GMP-style precision. /mz _______________________________________________ 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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