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Bug #70122 stream_select() modifies array incorrectly if openssl is enabled
Submitted: 2015-07-23 23:47 UTC Modified: -
From: jake dot zatecky at gmail dot com Assigned:
Status: Open Package: Streams related
PHP Version: 5.6.11 OS: Windows 7/Windows Server 2008
Private report: No CVE-ID: None
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 [2015-07-23 23:47 UTC] jake dot zatecky at gmail dot com
Description:
------------
I have determined that the stream_select() function modifies the $read variable incorrectly when php_openssl is loaded in more recent versions of PHP. For example, when running a listener with PHP 5.6.11 on port 8000 and using telnet, stream_select() returns the correct number of streams that received connection (1), but both the $read and $write arrays returned are in fact empty.

This issue disappears if php_openssl is not loaded, or if you use PHP 5.6.6 (x64 thread-safe). There are several related bugs, but it would appear that they address different issues.

I have verified this issue occurs identically on both PHP 5.6.9 and PHP 5.6.11 on a Windows 7 machine and Server 2008 R2 machine; it may occur on other operating systems as well. Both versions are 64bit and thread-safe. I used the same .ini configuration on each of the three versions.

See the test code below to reproduce this behavior. Make sure php_openssl.dll is loaded, run the PHP listener, and telnet the localhost port.

E.g.:

$ php listener.php

Then, in a separate terminal, run something similar to the following:

$ telnet localhost 8000



Test script:
---------------
<?php
$socket = stream_socket_server('tcp://0.0.0.0:8000', $errno, $errstr);

stream_set_blocking($socket, 0);

if (!$socket) {
	echo "$errstr ($errno)\n";
} else {
	$read = [$socket];
	$write = [];
	$except = null;

	$num = stream_select($read, $write, $except, null, null);

	// On PHP 5.6.9/5.6.11: int(1) and array(0) {}
	// On PHP 5.6.6       : int(1) and array(1) { [0] => ... }
	var_dump($num, $read);

	fclose($socket);
}

Expected result:
----------------
The $read variable should contain one element:

array(1) {
  [0]=>
  resource(5) of type (stream)
}

This is returned using PHP 5.6.6 or when openssl is disabled.

Actual result:
--------------
On PHP 5.6.9 and PHP 5.6.11, when openssl is loaded, the following is outputted instead:

int(1)
array(0) {
}

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