#45735 [Fbk->Opn]: preg_match fails with Segmentation Fault on capturing subpattern

From: Date: Wed, 06 Aug 2008 17:29:07 +0000
Subject: #45735 [Fbk->Opn]: preg_match fails with Segmentation Fault on capturing subpattern
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-127688@lists.php.net to get a copy of this message 
 ID:               45735
 User updated by:  johnston dot joshua at gmail dot com
 Reported By:      johnston dot joshua at gmail dot com
-Status:           Feedback
+Status:           Open
 Bug Type:         PCRE related
 Operating System: *
 PHP Version:      5.2CVS, 5.3CVS, 6CVS (2008-08-06)
 New Comment:

In my case the parens were unnecessary so I removed them which stopped
the Seg Fault.

Is there a way to handle this error from inside php?

If I set pcre.backtrack_limit to any other value will it always seg
fault if it is too low?


Previous Comments:
------------------------------------------------------------------------

[2008-08-06 16:38:30] jani@php.net

Setting pcre.backtrack_limit = 10000 prevents the crash for me.


------------------------------------------------------------------------

[2008-08-06 16:36:27] jani@php.net

==18470== Stack overflow in thread 1: can't grow stack to 0x7FE601FA8
==18470==
==18470== Process terminating with default action of signal 11
(SIGSEGV)
==18470==  Access not within mapped region at address 0x7FE601FA8
==18470==    at 0x4358C0: match (pcre_exec.c:403)
==18470== Stack overflow in thread 1: can't grow stack to 0x7FE601EC8


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[2008-08-06 15:22:20] johnston dot joshua at gmail dot com

Description:
------------
When running a preg_match with a capturing subpattern against large
input, php crashes with a Segmentation Fault
I tested this on OS X and OpenSuSE, same result
OS X:~$ php -v
PHP 5.2.6 (cli) (built: Jul 15 2008 12:18:21) 

OpenSuSE:~# php -v
PHP 4.4.7 (cgi) (built: May 12 2008 10:19:51)

Reproduce code:
---------------
<?php
preg_match("/http:\/\/(.)+\.ru/i", str_repeat("http://google.ru",
2000));
?>

Expected result:
----------------
PHP should handle the error or something other than letting PCRE crash
php

Actual result:
--------------
jjohnston:~$ php -r 'preg_match("/http:\/\/(.)+\.ru/i",
str_repeat("http://google.ru", 2000));'
Segmentation fault


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