Reseed the random number generator after fork().

Web applications use random numbers for things like sessions, if
we don't reseed then each worker will generate the same sequence
of random numbers which can lead to security concerns.

Thanks to Jonas Borgström for the patch.

THANKS

@@ -13,3 +13,5 @@ Chris Dent <chris.dent@gmail.com>
 Matt Good <matt@matt-good.net>
 Randall Leeds <randall.leeds@gmail.com>
 thomasst <http://github.com/thomasst>
+Jonas Borgström <http://github.com/jborg>
+

gunicorn/workers/base.py

@@ -6,6 +6,7 @@
 
 import logging
 import os
+import random
 import signal
 import sys
 import tempfile
@@ -82,6 +83,9 @@ class Worker(object):
         """
         util.set_owner_process(self.cfg.uid, self.cfg.gid)
 
+        # Reseed the random number generator
+        random.seed()
+
         # For waking ourselves up
         self.PIPE = os.pipe()
         map(util.set_non_blocking, self.PIPE)