Bug 1156518 (CVE-2014-8369)

Summary:	CVE-2014-8369 kernel: kvm: excessive pages un-pinning in kvm_iommu_map error path
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, areis, bhu, carnil, dhoward, ehabkost, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, knoel, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, mkenneth, mrezanin, mst, mtosatti, nmurray, pbonzini, pholasek, plougher, rt-maint, rvrbovsk, stefanha, virt-maint, vkaigoro, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was found that the fix for CVE-2014-3601 was incomplete: the Linux kernel's kvm_iommu_map_pages() function still handled IOMMU mapping failures incorrectly. A privileged user in a guest with an assigned host device could use this flaw to crash the host.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-09-26 03:33:33 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:	1156520, 1156521, 1156522
Bug Blocks:	1156525

Description Petr Matousek 2014-10-24 15:41:06 UTC

A flaw was found in the way iommu mapping failures were handled in
kvm_iommu_map_pages() function in the Linux kernel (introduced by the fix
for CVE-2014-3601).

A privileged user in the guest could use this flaw to crash the host in case
the guest has access to passed in device.

Introduced by:
http://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?id=350b8bdd689cd2ab2c67c8a86a0be86cfa0751a7

Upstream patch:
http://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?id=3d32e4dbe71374a6780eaf51d719d76f9a9bf22f

Comment 1 Petr Matousek 2014-10-24 15:41:45 UTC

Statement:

This issue did not affect the Linux kernel versions as shipped with Red Hat Enterprise Linux 5, 7 and Red Hat Enterprise MRG 2. Future Linux kernel updates for Red Hat Enterprise Linux 6 may address this issue.

Comment 3 Petr Matousek 2014-10-24 15:42:37 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1156522]

Comment 4 Fedora Update System 2014-10-28 06:44:33 UTC

kernel-3.16.6-203.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2014-11-03 05:22:42 UTC

kernel-3.17.2-300.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2014-11-16 14:46:16 UTC

kernel-3.14.23-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 errata-xmlrpc 2015-03-11 15:27:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:0674 https://rhn.redhat.com/errata/RHSA-2015-0674.html