Added workaround for a Ruby BigDecimal bug, CVE-2009-1904. (#3475)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2790 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/initializers/bigdecimal-segfault-fix.rb

@@ -0,0 +1,30 @@
+# Copyright (c) 2009 Michael Koziarski <michael@koziarski.com>
+# 
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+require 'bigdecimal'
+
+alias BigDecimalUnsafe BigDecimal
+
+
+# This fixes CVE-2009-1904 however it removes legitimate functionality that your
+# application may depend on.  You are *strongly* advised to upgrade your ruby
+# rather than relying on this fix for an extended period of time.
+
+def BigDecimal(initial, digits=0)
+  if initial.size > 255 || initial =~ /e/i
+    raise "Invalid big Decimal Value"
+  end
+  BigDecimalUnsafe(initial, digits)
+end
+