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Bug 245922

Summary: CVE-2007-3380 A TCP connection to DLM port blocks DLM operations
Product: Red Hat Enterprise Linux 5 Reporter: Marcel Holtmann <holtmann>
Component: kernelAssignee: Christine Caulfield <ccaulfie>
Status: CLOSED ERRATA QA Contact: Cluster QE <mspqa-list>
Severity: high Docs Contact:
Priority: high    
Version: 5.0CC: anton, ccaulfie, cfeist, dhoward, edamato, grimme, hlawatschek, kanderso, michael.hagmann, mjenner, qcai, security-response-team, teigland
Target Milestone: ---Keywords: Reopened, Security, ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=important,source=redhat,reported=20070626,public=20070626
Fixed In Version: RHSA-2007-0940 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-10-22 10:52:44 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: 245892    
Bug Blocks:    

Description Marcel Holtmann 2007-06-27 13:25:12 UTC 
Opening a tcp connection from a cluster member to another cluster member
targeting the dlm port it is enough to stop every dlm operation in the cluster.
This means that GFS and rgmanager will hangs.

1. telnet from a member of the cluster to another member of the cluster
targeting port 21064
2. Try to write to a mounted gfs filesystem

The write operation hangs and every following operation (read or write) on the
GFS filesystem on every node hangs.

Every service that use DLM seems to stop working. Rgmanager stop to works with a
"Unable to obtain cluster lock: Connection timed out" error message.

Even a zero data connection, like a TCP port scan is enough to stop DLM
operations on the whole cluster
Comment 2 RHEL Program Management 2007-07-05 18:06:17 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 David Teigland 2007-07-05 18:08:50 UTC 
why are we wasting our time with this bz?


*** This bug has been marked as a duplicate of 245892 ***
Comment 14 Christine Caulfield 2007-08-31 08:53:49 UTC 
OK, patch posted to you and rhkernel-list.
Comment 16 Anton Arapov 2007-10-04 18:34:04 UTC 
A patch for this issue has been included in build 2.6.18-8.1.15
Comment 21 Red Hat Bugzilla 2007-10-22 10:52:44 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-2007-0940.html