From: Shyouhei Urabe <shyouhei@...>
Date: 2011-05-25T14:13:44+09:00
Subject: [ruby-core:36450] [Ruby 1.8 - Bug #4338][Closed] random number generator not reseeded after fork in 1.8


Issue #4338 has been updated by Shyouhei Urabe.

Status changed from Assigned to Closed

I think I have fixed this.
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Bug #4338: random number generator not reseeded after fork in 1.8
http://redmine.ruby-lang.org/issues/4338

Author: Eric Wong
Status: Closed
Priority: Normal
Assignee: Shyouhei Urabe
Category: core
Target version: Ruby 1.8.7
ruby -v: ruby 1.8.7 (2010-12-23 patchlevel 330) [x86_64-linux]


=begin
 rand should return different values in forked processes like in 1.9.2.  This
 may have security implications for some programs.
 
 Remembering to call srand after forking will fix the issue, but remembering is
 hard especially since 1.9.2 makes it easy :)
 
 The following example prints out 3 identical lines in 1.8.7:
 
   fork { $stdout.syswrite("#{rand}\n") }
   fork { $stdout.syswrite("#{rand}\n") }
   $stdout.syswrite("#{rand}\n")
   Process.waitall
=end



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