Red Hat Bugzilla – Bug 209435
CVE-2006-5174 copy_from_user information leak on s390
Last modified: 2007-11-30 17:07:27 EST
Report from Martin Schwidefsky:
There is/has been a bug with copy_from_user on s390. The problem is that it does
not pad the kernel buffer with zeroes in case of a fault on the user address.
That allows a malicious user to read uninitialized kernel memory. The bug is
already fixed upstream:
committed in stream U5 build 42.20. A test kernel with this patch is available
committed in stream E5 build 42.0.4
The correct fix is in 42.0.6.
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.