From: kulminaator at gmail dot com
Operating system: Mac OS X 10.5.6
PHP version: 5.2.8
PHP Bug Type: Scripting Engine problem
Bug description: print_r produces output with $return set to true
Description:
------------
print_r creates output although it was not asked to
The code
$str = print_r($expression, true);
should never produce any output, but it does if php hits the memory limit
closely enough.
My memory_limit is set to 128M (may be this has to be the same to
reproduce the bug).
Needless to say, this is a security issue and may output information to
clients that never should go there by the code.
Reproduce code:
---------------
<?php
// php.ini has memory limit at 128M
$limit = (str_replace('M','',ini_get('memory_limit')))*1024*1024;
print "Memory limit is $limit bytes\n";
$data = str_repeat('x', $limit / 3 );
$x = print_r($data, true);
Expected result:
----------------
Out of memory error or no output at all.
Actual result:
--------------
The huge amount of x-es (xxxxxxxxxxxx about 40 million times) followed by
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to
allocate 44739243 bytes) in /private/tmp/proof_of_concept.php on line 6
--
Edit bug report at http://bugs.php.net/?id=47020&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=47020&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=47020&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=47020&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=47020&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=47020&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=47020&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=47020&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=47020&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=47020&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=47020&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=47020&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=47020&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=47020&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=47020&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47020&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=47020&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=47020&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=47020&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=47020&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=47020&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=47020&r=mysqlcfg
