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Bug 126127

Summary:	CAN-2004-0565 Information leak on Linux/ia64
Product:	Red Hat Enterprise Linux 2.1	Reporter:	Mark J. Cox <mjc>
Component:	kernel	Assignee:	Jim Paradis <jparadis>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	2.1	CC:	peterm, riel
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	ia64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2004-12-13 20:17:15 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mark J. Cox 2004-06-16 12:41:30 UTC

Linux ia64 kernels have a floating point leak 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.

Patch available and committed:

http://lia64.bkbits.net:8080/to-linus-2.5/cset@1.1726.29.7

CAN-2004-0565 Affects: 2.1AS(ia64) 2.1AW

Comment 1 Jim Paradis 2004-11-29 21:54:31 UTC

The referenced patch doesn't seem to exist (possibly merged out of bk or
somesuch).  Got another reference?

Comment 2 Mark J. Cox 2004-11-29 22:07:00 UTC

I don't have the exact link to the 2.4 changeset, but here is the 2.6
changeset to help find it.
http://linux.bkbits.net:8080/linux-2.6/cset@40bfc1cbJnl_19Ig3vzEM08521rh0w

Comment 3 Jim Paradis 2004-11-29 22:18:45 UTC

I found the 2.4 changeset, it's at 
http://linux.bkbits.net:8080/linux-2.4/cset@1.1425.3.1

Comment 4 John Flanagan 2004-12-13 20:17:15 UTC

An errata 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/RHSA-2004-504.html