Re: Bug #44872 canary mismatch on efree() - heap overflow detected

Can you try to compile PHP with --disable-all --enable-debug and a flag for the mssql extension, then try to run valgrind. From the output it seems there maybe errors in dl() library. On 14-Oct-08, at 4:15 AM, Krister Karlström wrote:

Hi, I run the script on a server in our production environment, a slackware server with a self compiled PHP from source. The PHP version was 5.2.5. php-v gives the following: PHP 5.2.5 (cli) (built: Mar 28 2008 12:02:55) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies I found the problem on a development server which was running Ubuntu and apperently also the Suhosin patch (the latest available packet from Ubuntu). /Krister Karlström Pierre Joye wrote:

hi, On Tue, Oct 14, 2008 at 8:46 AM, Krister Karlström <krister.karlstrom@arcada.fi> wrote:

About this bug #44872, I run my small sample script (posted on the bug reporting page) through valgrind and got the attached output. I'm not sure whether this shows that there's a leak in the mssql extension or if this is normal. Valgrind said that 853 bytes where definitely lost, does this mean that there is a memory leak? Hopefully someone who is better to analyze valgrinds output than me can tell the answer... Here's the full output from valgrind:

That's exactly why it is not as easy that some may say. This report shows the (expected sometimes) warnings with dl and something related to the SNMP extension. The scripts in the bug report were using mysqli and mssql, with all kind of possible extensions (zend optimizer, debugger, etc.) and patches applied. Did you run it using a self compiled php? Which version? Cheers,

--* Ing. Krister Karlström, Zend Certified Engineer * * Systemutvecklare, IT-Centralen * * Arcada - Nylands Svenska Yrkeshögskola * * Jan-Magnus Janssons plats 1, 00550 Helsingfors, Finland * * Tel: +358(20)7699699 GSM: +358(50)5328390 * * E-mail: krister.karlstrom@arcada.fi * --PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php

Ilia Alshanetsky