From: redmine@...
Date: 2011-04-15T11:30:16+09:00
Subject: [ruby-core:35764] [Ruby 1.8 - Bug #4338][Assigned] random number generator not reseeded after fork in 1.8


Issue #4338 has been updated by Shyouhei Urabe.

Status changed from Open to Assigned
Assignee set to Shyouhei Urabe

OK, now I consider this is a bug.  To be fixed on the next patchlevel.  Stay tuned.
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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: Assigned
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]


 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


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