#38285 [NEW]: php.ini configuration to limit the maximum buffer size doesn't work.

From: bref at instinctiv-e dot com Operating system: Linux 2.6.17 PHP version: 5.1.4 PHP Bug Type: Output Control Bug description: php.ini configuration to limit the maximum buffer size doesn't work. Description: ------------ Output buffering doesn't respect the maximum limit as set in php.ini in php 5.1.4 plus some earlier versions. output_buffering=xxx In fact it is possible to go well past the limit and consume the entire memory allocated to the script by memory_limit causing the script to halt. snippet from php.ini - If you wish to limit the size of the buffer ; to a certain size - you can use a maximum number of bytes instead of 'On', as ; a value for this directive (e.g., output_buffering=4096). Reproduce code: --------------- ini_set("zlib.output_compression",0); ini_set("max_execution_time",5); // set this to larger than your output_buffering=xxx limit ini_set("memory_limit",'3M'); echo 'Maximum buffer size as set in php.ini output_buffering: ', $limit = ini_get("output_buffering"), '<br />'; echo '<br />','Starting OB test...','<br />'; ob_start(); // fill up the buffer 10 bytes beyond the supposed limit for($i=0;$i<($limit+10);$i++) { echo 'a'; } $size = ob_get_length(); ob_end_flush(); Expected result: ---------------- Expected the output buffer to respect the maximum bytes cap as set out in php.ini output_buffering=xxxx Actual result: -------------- The buffer keeps on growing past the set limit, until it fills the memory_limit or max_execution_time limits and terminates the script. -- Edit bug report at http://bugs.php.net/?id=38285&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=38285&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=38285&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=38285&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=38285&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=38285&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=38285&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=38285&r=needscript Try newer version: http://bugs.php.net/fix.php?id=38285&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=38285&r=support Expected behavior: http://bugs.php.net/fix.php?id=38285&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=38285&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=38285&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=38285&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=38285&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=38285&r=dst IIS Stability: http://bugs.php.net/fix.php?id=38285&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=38285&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=38285&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=38285&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=38285&r=mysqlcfg