+++ This bug was initially created as a clone of Bug #250496 +++ Description of problem: The eHCA driver has a problem with mapping userspace resources. It's nicely explained in the upstream git submission: Some drivers have resources that they want to be able to map into userspace that are 4k in size. On a kernel configured with 64k pages we currently end up mapping the 4k we want plus another 60k of physical address space, which could contain anything. This can introduce security problems, for example in the case of an infiniband adaptor where the other 60k could contain registers that some other program is using for its communications. This is present in kernel-2.6.18-36.el5 Without these changes the eHEA driver will only function in IPoIB (IP over Infiniband). User space applications will fail to run (for example MPI). Its primary value is thus not usable. -- Additional comment from smoser on 2007-08-01 17:58 EST -- Created an attachment (id=160469) ib_ehca_user_space_support_for_rhel5.patch
Created attachment 160470 [details] libehca_user_space_support_for_rhel5.patch
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/RHEA-2007-0645.html