This bug has been copied from bug #647365 and has been proposed
to be backported to 6.0 z-stream (EUS).
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 therefore 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.
Technical note added. If any revisions are required, please edit the "Technical Notes" field
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On IBM System z systems, user space programs could access the /dev/mem file (which contains an image of main memory), where an accidental memory (write) access could potentially be harmful. To restrict access to memory from user space through the /dev/mem file, the CONFIG_STRICT_DEVMEM configuration option has been enabled for the default kernel. The kdump and debug kernels have this option switched off by default.