Bug 209435

Summary:	CVE-2006-5174 copy_from_user information leak on s390
Product:	Red Hat Enterprise Linux 4	Reporter:	Marcel Holtmann <holtmann>
Component:	kernel	Assignee:	Jan Glauber <jglauber>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	high	Docs Contact:
Priority:	medium
Version:	4.0	CC:	security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:	impact=important,source=vendorsec,reported=20061004,public=20060928
Fixed In Version:	RHSA-2007-0014	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-01-30 14:28:42 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:
Bug Depends On:
Bug Blocks:	213568

Description Marcel Holtmann 2006-10-05 12:23:57 UTC

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:

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=52149ba6b0ddf3e9d965257cc0513193650b3ea8

Comment 3 Jason Baron 2006-10-23 19:22:23 UTC

committed in stream U5 build 42.20. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/

Comment 4 Jason Baron 2006-12-18 21:42:11 UTC

committed in stream E5 build 42.0.4

Comment 6 Mike Gahagan 2007-01-17 19:53:05 UTC

The correct fix is in 42.0.6.

Comment 8 Red Hat Bugzilla 2007-01-30 14:28:42 UTC

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.

http://rhn.redhat.com/errata/RHSA-2007-0014.html