#39934 [Opn->Bgs]: pcre simple segfault ?
| From: | tony2001@php.net | Date: | Fri, 22 Dec 2006 21:42:50 +0000 |
| Subject: | #39934 [Opn->Bgs]: pcre simple segfault ? | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-106807@lists.php.net to get a copy of this message | ||
ID: 39934
Updated by: tony2001@php.net
Reported By: toggg@php.net
-Status: Open
+Status: Bogus
Bug Type: PCRE related
Operating System: Irrelevant
PHP Version: 4.4.4
New Comment:
Stack overflow in PCRE has been reported many times and is not really a
problem in PHP, though newer PHP versions (5.2.0+) have a workaround for
this problem.
See pcre.backtrack_limit @ http://php.net/pcre
Previous Comments:
------------------------------------------------------------------------
[2006-12-22 20:35:40] toggg@php.net
Description:
------------
It is a reduction of http://pear.php.net/bugs/bug.php?id=7908
This test is breaking by repeat=437 by php-4.4.4 Windows NT and 10000
by php 5.1.6 linux FC5
It's not breaking if you give ok=1 or nomatch=1 or reduce enough
repeat.
Note: it's php version irrelevent , but your sytem forced to choose
some.
Reproduce code:
---------------
<?php
error_reporting(E_ALL);
ini_set('display_errors', true);
function process($matches)
{
return $matches[0];
}
$regex = isset($_GET['ok']) ? '#X(.*?)X#' : '#X((.)*?)X#';
$around = isset($_GET['nomatch']) ? 'Y' : 'X';
$repeat = isset($_GET['repeat']) ? (int) $_GET['repeat'] : 10000;
$source = $around . str_repeat('a', $repeat) . $around;
$transform = preg_replace_callback($regex, 'process', $source);
echo '---Text---' . strlen($source) . "\n";
echo "---Transform---" . strlen($transform) . "\n";
?>
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Edit this bug report at http://bugs.php.net/?id=39934&edit=1