jbaron said to rhkernel-list "below, is a patch i've been tracking from Ingo, but i'm not sure its been posted here. Not sure if there is a bugzilla, but it is a real security issue. Afaict, the check ensures that kernel access to userspace read and write paths is within its proper bounds for the 4/4 split. i expect Ingo to ack this ;)"
Created attachment 117600 [details] Proposed (revised) patch from Ingo
Removing embargo
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-514.html