Bug #54317 [Opn->Nab]: Regexp crashes Apache/PHP

Edit report at https://bugs.php.net/bug.php?id=54317&edit=1 ID: 54317 Updated by: cmb@php.net Reported by: christian dot achatz at adventure-php-framework Summary: Regexp crashes Apache/PHP -Status: Open +Status: Not a bug Type: Bug Package: PCRE related Operating System: Windows PHP Version: 5.3.6 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: The potential stack exhaustion is alread noted in the manual, see <http://php.net/manual/en/pcre.configuration.php#ini.pcre.recursion-limit>. More detailed information might quickly become out-dated. Previous Comments: ------------------------------------------------------------------------ [2011-03-25 10:22:33] christian dot achatz at adventure-php-framework Thanks for your analysis. I'll try the solution described on the MSDN article. ------------------------------------------------------------------------ [2011-03-19 17:56:35] pajoye@php.net Maybe worth adding my last comment to the PHP manual. ------------------------------------------------------------------------ [2011-03-19 17:56:09] pajoye@php.net Stack size problem. You can run the script through the CLI sapi to see that PHP actually works. However Apache has a smaller stack and causes such regexp to crash (or similar side effect). Increase the stack of Apache to fix this problem. Use Editbin for that: http://msdn.microsoft.com/en-us/library/d25ddyfc(v=VS.80).aspx ------------------------------------------------------------------------ [2011-03-19 16:05:27] christian dot achatz at adventure-php-framework Description: ------------ --- From manual page: http://www.php.net/function.preg-replace#Description --- Calling the script below apache crashes on windows installations. After removing almost any of the lines inside $notworking apache will NOT crash, no matter which line was removed in most cases. Here is the system list that causes a crash or not: Windows 7 SP1 (64bit) | XAMPP | Apache/2.2.17 (Win32) | PHP 5.3.5 | <<<<<<< CRASH! Windows XP (32+64bit) | XAMPP | Apache 2.2.17 | PHP 5.3.5 | <<<<<<< CRASH! WinXP 32Bit / Apache 2.2.17 / PHP 5.2.14 <<<<<<< CRASH! Fedora 32Bit / Apache 2.2.15 / PHP 5.3.3 --> OK Ubuntu 10.10 32Bit / Apache2 2.2.16 / PHP 5.3.3 -> OK Test script: --------------- <?php echo 'Is the following crashing apache or whatever?<br />'.PHP_EOL; // After removing almost any of the lines inside $notworking apache will NOT crash, no matter which line was removed in most cases. $notworking = '<?php //<*IslandStorageBase:start*> DO NOT CHANGE THIS COMMENT! /** * Automatically generated BaseObject for IslandStorage. !!DO NOT CHANGE THIS BASE-CLASS!! * CHANGES WILL BE OVERWRITTEN WHEN UPDATING!! * You can change class "IslandStorage" which will extend this base-class. */ class IslandStorageBase extends AbstractSimpleStorage { } <*IslandStorageBase:end*> ?>'; $content = preg_replace( '%//<\*IslandStorageBase:start\*>(.)+<\*IslandStorageBase:end\*>%s', 'test', $notworking ); echo 'If you can see this everything seems to be working fine.'; ?> Expected result: ---------------- Is the following crashing apache or whatever? If you can see this everything seems to be working fine. Actual result: -------------- Apache crashes with the following log entry: Parent: child process exited with status xyz -- Restarting. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=54317&edit=1