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Bug #11617 crash when restoring references
Submitted: 2001-06-22 11:01 UTC Modified: 2001-06-24 13:16 UTC
From: zork at pablosoft dot com dot pl Assigned:
Status: Closed Package: Session related
PHP Version: 4.0 Latest CVS (2001-06-22) OS: Linux 2.2.16 (Cobalt Raq4)
Private report: No CVE-ID: None
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From: zork at pablosoft dot com dot pl
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 [2001-06-22 11:01 UTC] zork at pablosoft dot com dot pl
There is still problem in serialize/unserialize mechanism  used to restore session variables(after closing #8676 bug which was supoused to correct the problem). Here is simplest script I can produce that does apache segfault on my machine:

<?
class Cscreen {
	var $page;
	var $frames;

	function Cscreen() {
		$this -> frames = array();
	}
};

class CError_handler {
	var $msg_error;
	
	function CError_handler() {
		$this -> msg_error = new CMessage();
	}
};

class CConnection_Table {
	var $data;
	
	function CConnection_table() {
		$this -> data = array();
	}
	
	function mconnect($message,&$object,$method) {
		$data[0] = &$object;
		$data[1] = $method;
		$this -> data[$message -> msg_id][] = $data;
	}
};

class CMessage {
	var $data;
	var $msg_id;
	
	function CMessage($data = 0) {
		global $__CMSGID_NEXT;
		$this -> msg_id = $__CMSGID_NEXT++;
		$this -> data = $data;
	}
};

function MCONNECT(&$message,&$obj_name,$method_name) {
	global $__connection_table;
	$__connection_table -> mconnect($message,$obj_name,$method_name);
};

session_start();
session_destroy();
$__connection_table = new CConnection_table;
session_register("__connection_table");

$screen = new Cscreen();
session_register("screen");

$error_handler = new CError_handler($screen);
MCONNECT($error_handler -> msg_error,$screen,"fatal_error");
session_register("error_handler");
echo "done";
exit();


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 [2001-06-23 17:34 UTC] sniper@php.net
Could you please try again? The fix wasn't ok, but now
it's been rewritten and should work.

If it still crashes, try to generate a gdb backtrace of
the crash. And thank you for helping!

--Jani
 
 [2001-06-24 11:29 UTC] zork at pablosoft dot com dot pl
Tried, but php still changed. Maybe it is something with CVS (forgot to commit?), I've checked session.c revision and result was:

revision 1.213
date: 2001/06/21 18:46:25;  author: thies;  state: Exp;  lines: +31 -26

I've submitted this bug later.

Zork
 [2001-06-24 11:59 UTC] sniper@php.net
And the GDB backtrace is where? Please include it.

 [2001-06-24 12:49 UTC] zork at pablosoft dot com dot pl
I've messed up something with my versions. Recompiled good and now it looks like it works fine. Sorry for confusion.

Zork


 [2001-06-24 13:16 UTC] sniper@php.net
Closed then.

 
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