Full Disclosure mailing list archives
Re: Firefox 2.0.0.7 has a very serious calculation bug
From: Michal Zalewski <lcamtuf () dione cc>
Date: Fri, 28 Sep 2007 19:22:35 +0200 (CEST)
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/
Current thread:
- Re: Firefox 2.0.0.7 has a very serious calculation bug, (continued)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Jimby Sharp (Sep 29)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Andrew Farmer (Sep 29)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Jimby Sharp (Sep 29)
- Re: Firefox 2.0.0.7 has a very serious calculation bug James Matthews (Sep 29)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Mukul Dharwadkar (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Steven Adair (Sep 28)
- Re: Firefox 2.0.0.7 has a very seriouscalculation bug gjgowey (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Jimby Sharp (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Michal Zalewski (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Rodrigo Barbosa (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Michal Zalewski (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Jimby Sharp (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Rodrigo Barbosa (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Brian Kim (Sep 28)
- Re: Firefox 2.0.0.7 has a very serious calculation bug Susam Pal (Sep 28)