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.
Created attachment 160469 [details]
You can download this test kernel from http://people.redhat.com/dzickus/el5
----- Additional Comments From HNGUYEN@de.ibm.com 2007-08-28 13:04 EDT
Downloaded snapshot3 dvd and installed it on our ppc64 system:
[root@idd60 ~]# uname -r
Performed following tests:
- kernel space
* flood ping, ifconfig down/up, rmmod/modprobe
- user space
* ibv_ud/rc/uc_pingpong, reverse direction, parallel runs
Thus, basically everything runs perfectly so far.
Just wondering if the dvd image above contains any mpi testsuite. If yes,
you (someone from RH) tell me the package name to install? I was able to
install openmpi, but could not find any osu benchmark tests eg osu_bw.
Running such one mpi appl would stress user space much more than the user
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An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
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