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From Shanti Subramanyam <shanti.subraman...@gmail.com>
Subject Re: ALERT - canary mismatch on efree() - heap overflow detected
Date Thu, 20 May 2010 04:50:33 GMT
It's strange that multiple files seem to be complaining about it. Did you
try disabling Suhosin ? Are you seeing a perceptible drop in memory after
reaching steady state ?

shanti

On Wed, May 19, 2010 at 4:28 PM, Vasileios Kontorinis <bkontorinis@gmail.com
> wrote:

> Lately I get a bunch of these errors in my logs:
>
> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary
> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file
> '/var/www/oliophp/public_html/taggedEvents.php')
> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary
> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file
> '/var/www/oliophp/public_html/taggedEvents.php')
> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary
> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file
> '/var/www/oliophp/public_html/users.php')
> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary
> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file
> '/var/www/oliophp/public_html/events.php')
> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary
> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file
> '/var/www/oliophp/public_html/taggedEvents.php')
>
> According to blogs it is a php related issue. Suhosin patch detects a
> memory overflow and complains.
> I was just wondering if the Olio php code is having any known mem. leaks.
>
> My php version on ubuntu:
> PHP 5.2.4-2ubuntu5 with Suhosin-Patch 0.9.6.2 (cli) (built: Feb 27 2008
> 20:46:51)
> Copyright (c) 1997-2007 The PHP Group
> Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
>
> It's too bad that I do not get a line on the php files that cause this.
>
>
> Has anyone come across this one before?
>
>
> -------------------------------------------------------------------
> Kontorinis Vasileios
> Phd student, University of California San Diego
> San Diego, CA 92122
> Cell. phone: (858) 717 6899
> bkontorinis@gmail.com, vkontori@ucsd.edu
> -------------------------------------------------------------------
>

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