No secret option provided to Rack::Session::Cookie warning?

I am running Rails 3.2.3, Ruby 1.9 under Fedora 17. I get this warning, when I run rails s, and how do I fix?

SECURITY WARNING: No secret option provided to Rack::Session::Cookie. This poses a security threat. It is strongly recommended that you provide a secret to prevent exploits that may be possible from crafted cookies. This will not be supported in future versions of Rack, and future versions will even invalidate your existing user cookies.

This is a Rails bug, as the subclass is violating the superclass API contract.

The warning can be safely ignored by Rails users.

(https://github.com/rack/rack/issues/485#issuecomment-11956708, emphasis added)

Confirmation on the rails bug discussion: https://github.com/rails/rails/issues/7372#issuecomment-11981397

Reading the discussion based on tehgeekmeisters answer, this warning is popping up as Rails is using Rack cookies in a different way than intended. It should be ok to just ignore this warning for now until there is a final agreement on how to handle this issue and a fix in place.

This issue has been worked around in the just released Rails 3.2.11.

Log: https://github.com/rails/rails/commits/v3.2.11

Commit: https://github.com/rails/rails/commit/95fe9ef945a35f56fa1c3ef356aec4a3b868937c

rails 3.2.9 - ruby 1.9.3p125 (2012-02-16 revision 34643) [i686-linux]

Hello everyone, the following has worked for me, it may work for you.

/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.9/lib/action_dispatch/middleware/session/abstract_store.rb

module Compatibility
          def initialize(app, options = {})
            options[:key]     ||= '_session_id'
            #fixed warning - SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
            options[:secret] ||= Rails.application.config.secret_token
            super
          end
    end