Bug 421441

Summary:	kernel dm-crypt: possible max_phys_segments violation
Product:	Red Hat Enterprise Linux 5	Reporter:	Milan Broz <mbroz>
Component:	kernel	Assignee:	Milan Broz <mbroz>
Status:	CLOSED ERRATA	QA Contact:	Martin Jenner <mjenner>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.1	CC:	agk, pvrabec
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2008-0314	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-05-21 15:03:40 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 Milan Broz 2007-12-12 13:43:57 UTC

In write operation dm-crypt needs to allocate new bio request
and run crypto operation on this clone. Cloned request has always
the same size, but number of physical segments can be increased
and violate max_phys_segments restriction.

This can lead to data corruption and serious hardware malfunction.

See
http://www2.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-crypt-use-bio_add_page.patch

Comment 1 RHEL Program Management 2007-12-12 13:45:44 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 3 Milan Broz 2007-12-21 12:19:50 UTC

Fix is upstream - commit 91e106259214b40e992a58fb9417da46868e19b2

Comment 4 Don Zickus 2007-12-21 20:18:40 UTC

in 2.6.18-62.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 7 errata-xmlrpc 2008-05-21 15:03:40 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/RHBA-2008-0314.html