From 58bae71a7b023b5bb5fdcfefb46232f3f14bc519 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 13 Jun 2011 09:36:48 +0000
Subject: * lib/securerandom.rb (SecureRandom.random_bytes): modify PRNG state 
  to prevent random number sequence repeatation at forked child   process
 which has same pid.   reported by Eric Wong.  [ruby-core:35765]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32050 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/securerandom.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lib/securerandom.rb')

diff --git a/lib/securerandom.rb b/lib/securerandom.rb
index e04251bb67..d238a35406 100644
--- a/lib/securerandom.rb
+++ b/lib/securerandom.rb
@@ -57,6 +57,14 @@ module SecureRandom
     n ||= 16
 
     if defined? OpenSSL::Random
+      @pid = $$ if !defined?(@pid)
+      pid = $$
+      if @pid != pid
+        now = Time.now
+        ary = [now.to_i, now.nsec, @pid, pid]
+        OpenSSL::Random.seed(ary.to_s)
+        @pid = pid
+      end
       return OpenSSL::Random.random_bytes(n)
     end
 
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