From: payton2558 at googlemail dot com
Operating system: Windows XP 32, Vista 32
PHP version: 5.2.6
PHP Bug Type: Unknown/Other Function
Bug description: Serious flaw in random related functions and possibly file or
memory corruption
Description:
------------
The reproduce code demonstrates the bug. You can modify the code in
different ways to affect the severity of the output.
Appears to require Windows.
Please note I have tested on 2 different machines and 3 versions of php. I
have also confirmed this with a couple of users on IRC.
mt_rand may also be affected but not as badly
Unrelated: bugs.php your CAPTCHA system is the worst I could ever expect
for a programming related group
Reproduce code:
---------------
<?php
function RandomNumber() {
$word1 = file('word1.txt'); // word1 and word2.txt can be made by
fwriting "word\n" 50000 times. Different filesizes affect bug.
$word2 = file('word2.txt');
$rword1 = trim($word1[array_rand($word1)]);
$rword2 = trim($word2[array_rand($word2)]);
$rnum = rand(1,999);
return $rnum;
}
for ($i=0; $i<20; $i++) {
echo RandomNumber()."\n";
}
?>
Expected result:
----------------
20 random looking numbers
Actual result:
--------------
20 identical numbers or in other cases, severely unrandom numbers
--
Edit bug report at http://bugs.php.net/?id=45301&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=45301&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=45301&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=45301&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=45301&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=45301&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=45301&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=45301&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=45301&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=45301&r=support
Expected behavior: http://bugs.php.net/fix.php?id=45301&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=45301&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=45301&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=45301&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45301&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=45301&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=45301&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=45301&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=45301&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=45301&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=45301&r=mysqlcfg
