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Bug #25307 Crash when session.serialize_handler=wddx & session, post, get vars
Submitted: 2003-08-29 04:35 UTC Modified: 2003-08-29 09:19 UTC
From: cristea at pntcd dot ro Assigned:
Status: Closed Package: Session related
PHP Version: 4CVS-2003-08-29 (stable) OS: any
Private report: No CVE-ID: None
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 [2003-08-29 04:35 UTC] cristea at pntcd dot ro 
Description:
------------
Apache will crash session.serialize_handler is set to wddx and when a $_SESSION var have the same name as a $_POST (or $_GET) var.

Try this code:
File w1.php
-----------
<?php
ini_set('session.serialize_handler', 'wddx');
session_start();
$_SESSION['a'] = 'test';
echo <<< EOS
<form action="w2.php" method="post">
<input type="text" name="a" value="">
<input type="submit">
</form>
EOS;
?>

File w2.php
-----------
<?php
ini_set('session.serialize_handler', 'wddx');
session_start();
print_r($_SESSION);
echo "<hr>";
print_r($_POST);
?>

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 [2003-08-29 05:40 UTC] sniper@php.net 
Happens only when wddx is the serializer and 
register_globals is 'On'.

Backtrace as follows:

0x40567dfa in var_replace (var_hashx=0x0, ozval=0x8244114, nzval=0x8236ef0) at var_unserializer.re:40
40      var_unserializer.re: No such file or directory.
(gdb) bt
#0  0x40567dfa in var_replace (var_hashx=0x0, ozval=0x8244114, nzval=0x8236ef0) at var_unserializer.re:40
#1  0x404e727b in php_set_session_var (name=0x824429c "a", namelen=1, state_val=0x8244114, var_hash=0x0)
    at /usr/src/web/php/php4_3/ext/session/session.c:307
#2  0x405720e2 in ps_srlzr_decode_wddx (
    val=0x824724c "<wddxPacket version='1.0'><header/><data><struct><var name='a'><string>test</string></var></struct></data></wddxPacket>", vallen=119) at /usr/src/web/php/php4_3/ext/wddx/wddx.c:292
#3  0x404e7e5c in php_session_decode (
    val=0x824724c "<wddxPacket version='1.0'><header/><data><struct><var name='a'><string>test</string></var></struct></data></wddxPacket>", vallen=119) at /usr/src/web/php/php4_3/ext/session/session.c:523
#4  0x404e8254 in php_session_initialize () at /usr/src/web/php/php4_3/ext/session/session.c:608
#5  0x404e9764 in php_session_start () at /usr/src/web/php/php4_3/ext/session/session.c:1036
#6  0x404eb41b in zif_session_start (ht=0, return_value=0x8246ff4, this_ptr=0x0, return_value_used=0)
    at /usr/src/web/php/php4_3/ext/session/session.c:1475
 [2003-08-29 06:06 UTC] cristea at pntcd dot ro 
In this case is a bug. If the serializer is set to 'php' everything is OK.
 [2003-08-29 06:18 UTC] sniper@php.net 
This patch _seems_ to fix this bug:
http://www.php.net/~jani/patches/bug25307.patch

(doesn't crash for me anymore)
 [2003-08-29 06:32 UTC] cristea at pntcd dot ro 
I'm using php binary on win32. I cannot use this patch. Could this be included on http://snaps.php.net ?
 [2003-08-29 09:19 UTC] sniper@php.net 
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
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http://www.php.net/manual/.

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