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Bug 165345

Summary:	CVE-2005-4811 Hugepage crash on failing mmap()
Product:	Red Hat Enterprise Linux 4	Reporter:	Mark J. Cox <mjc>
Component:	kernel	Assignee:	Larry Woodman <lwoodman>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	high	Docs Contact:
Priority:	medium
Version:	4.0	CC:	jbaron, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:	impact=important,reported=20050805,source=lkml,public=20050805
Fixed In Version:	RHSA-2006-0689	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-10-05 19:17:02 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 2005-08-08 11:56:37 UTC

A patch sent to LKML points out that depending on hugepage configuration an
uprivileged user could cause a crash.  However this is because various
functionality in the arch/*/mm/hugetlbpage.c was merged.  So for upstream
kernels it only affected >2.6.12 (and therefore not released versions).

http://marc.theaimsgroup.com/?l=linux-kernel&m=112323336017157
http://linux.bkbits.net:8080/linux-2.6/cset%4042f3bc80L_XvX5Aw3DqXdSmmzosXWA

However this looks from inspection only that this may affect the
linux-2.6.9-x86_64-hugetlb.patch added in U1, RHSA-2005:520 (bugzilla #143472).

Therefore x86_64 may be vulnerable to this problem.

A patch will need to be crafted from the bk reference above, but it looks fairly
straightforward.  I've not seen a reproducer.

Comment 1 Larry Woodman 2005-08-16 18:48:34 UTC

I dont think this pertains to RHEL4, the code being patched isnt even in the
2.6.9 kernel.

Larry Woodman

Comment 2 Mark J. Cox 2005-08-17 13:51:16 UTC

This looks from inspection only that it affect the
linux-2.6.9-x86_64-hugetlb.patch added in U1, RHSA-2005:520 (bugzilla #143472).

Comment 5 Larry Woodman 2006-08-31 18:07:49 UTC

I just sent the proposed RHEL4-U5 patch to rhkernel_list.

Comment 6 Jason Baron 2006-09-05 15:55:36 UTC

committed in stream U5 build 42.6. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/

Comment 7 Jason Baron 2006-09-26 14:31:56 UTC

committed in stream E5 build 42.0.3

Comment 8 RHEL Program Management 2006-09-27 22:42:51 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 10 Jay Turner 2006-10-03 13:40:30 UTC

QE ack for 4.5.

Comment 12 Red Hat Bugzilla 2006-10-05 19:17:02 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-2006-0689.html