Red Hat Bugzilla – Bug 124734
CAN-2004-0565 Information leak on Linux/ia64
Last modified: 2013-03-06 00:57:06 EST
Description of problem:
Linux 2.4.x and the SLES9/ia64 kernels have a floating point leak.
This is because the context switch code checks just the psr.mfh bit
and doesn't look at who the FPH owner is.
This allows a malicious program to set the MFH bit and look at the
registers of another possibly sensitive process.
Version-Release number of selected component (if applicable):
Run N (= number of cpus) copies of the program secret and one copy of
the program check.
Created attachment 100687 [details]
Lazy FP leak fix
This patch fixes the issue.
Created attachment 100688 [details]
Created attachment 100689 [details]
*** Bug 126126 has been marked as a duplicate of this bug. ***
A fix for this problem has just been committed to the RHEL3 E5
patch pool this evening (in kernel version 2.4.21-27.0.1.EL).
A fix for this problem has also been committed to the RHEL3 U5
patch pool this evening (in kernel version 2.4.21-27.4.EL).
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.