Full Disclosure mailing list archives
Re: Firefox 2.0.0.7 has a very serious calculation bug
From: "Jimby Sharp" <jimbysharp () gmail com>
Date: Sat, 29 Sep 2007 00:32:41 +0530
Michal 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? On 9/28/07, Michal Zalewski <lcamtuf () dione cc> wrote:
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/
_______________________________________________ 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 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)