ID: 37947
Updated by: [EMAIL PROTECTED]
Reported By: wmeler at wp dot pl
-Status: Assigned
+Status: Closed
Bug Type: Scripting Engine problem
Operating System: Linux
PHP Version: 5.1.5CVS
Assigned To: dmitry
New Comment:
Fixed in CVS HEAD and PHP_5_2.
Previous Comments:
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[2006-06-28 20:19:47] [EMAIL PROTECTED]
Dmitry, could you plz check it out?
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[2006-06-28 14:17:21] wmeler at wp dot pl
Description:
------------
Argument stack reallocations may cause heap corruption or segmentation
faults.
Functions that accept arguments through zend_get_parameters (zval ** -
pointer to zend_ptr_stack element) and running user callbacks that may
need more stack space are affected.
So unserialize (__wakeup), sort functions in 4.4 version, and so on.
Also using complicated user error handler is quite risky.
Reproduce code:
---------------
<?
class test {
function extend_zend_ptr_stack($count,$a,$b,$c,$d,$e) {
if ($count>0) $this->extend_zend_ptr_stack($count -
1,$a,$b,$c,$d,$e);
}
function __wakeup() {
$this->extend_zend_ptr_stack(10,'a','b','c','d','e');
}
}
$str='a:2:{i:0;O:4:"test":0:{}junk';
var_dump(unserialize($str));
Expected result:
----------------
bool(false)
Actual result:
--------------
#0 0x081be837 in zif_unserialize (ht=1, return_value=0x9b97ddc,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=1) at
/root/cvs/php_5_1/ext/standard/var.c:860
#1 0x08234f10 in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfec6c80) at
/root/cvs/php_5_1/Zend/zend_vm_execute.h:192
#2 0x082348a1 in execute (op_array=0x9ba611c) at
/root/cvs/php_5_1/Zend/zend_vm_execute.h:92
#3 0x0821acb2 in zend_execute_scripts (type=8, retval=0x0,
file_count=3) at /root/cvs/php_5_1/Zend/zend.c:1101
#4 0x081e2804 in php_execute_script (primary_file=0xbfec9180) at
/root/cvs/php_5_1/main/main.c:1719
#5 0x08285f9e in main (argc=2, argv=0xbfec9254) at
/root/cvs/php_5_1/sapi/cli/php_cli.c:1090
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Edit this bug report at http://bugs.php.net/?id=37947&edit=1
