From 8a52791ee8387e6f5cac570088ee18183900741b Mon Sep 17 00:00:00 2001
From: Derek Jones <derek.jones@ellislab.com>
Date: Thu, 24 Sep 2009 14:25:39 +0000
Subject: increased randomness of file name used in is_really_writable()

---
 system/codeigniter/Common.php | 2 +-
 user_guide/changelog.html     | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/system/codeigniter/Common.php b/system/codeigniter/Common.php
index eb9dce648..73ff0196f 100644
--- a/system/codeigniter/Common.php
+++ b/system/codeigniter/Common.php
@@ -62,7 +62,7 @@ function is_really_writable($file)
 	// write a file then read it.  Bah...
 	if (is_dir($file))
 	{
-		$file = rtrim($file, '/').'/'.md5(rand(1,100));
+		$file = rtrim($file, '/').'/'.md5(mt_rand(1,100).mt_rand(1,100));
 
 		if (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
 		{
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 6ec6cd32f..a6eaef166 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -76,6 +76,7 @@ SVN Revision: </p>
 
 <h3>Bug fixes for 1.7.3</h3>
 <ul>
+	<li>Increased randomness with<kbd>is_really_writable()</kbd> to avoid file collisions when hundreds or thousands of requests occur at once.</li>
 	<li>Fixed or clarified assorted user guide typos or examples.</li>
 </ul>
 
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