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AUSCERT External Security Bulletin Redistribution
ESB-2009.0161 -- [Solaris]
The Name Service Caching Daemon (nscd(1M)) Does Not Cache Hosts for Cluster
Nodes After Installing Patch 120011-14 (SPARC) or 120012-14 (x86)
20 February 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: nscd
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Denial of Service
Access: Existing Account
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-247466-1
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Solution Type: Sun Alert
Solution 247466 : The Name Service Caching Daemon (nscd(1M)) Does
Not Cache Hosts for Cluster Nodes After Installing Patch 120011-14
(SPARC) or 120012-14 (x86)
Bug ID: 6634592
Product
Solaris Cluster 3.2
Date of Resolved Release: 18-Feb-2009
SA Document Body
Installing patches 120011-14 (sparc) or 120012-14 (x86) may cause
performance degradation:
1. Impact
Installing patches 120011-14 (SPARC) or 120012-14 (x86) may
cause a performance degradation on systems running applications that
perform hostname lookups.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris Cluster 3.2 (for Solaris 10) with patch 120011-14 or
later and without patch 126106-27
x86 Platform
* Solaris Cluster 3.2 (for Solaris 10) with patch 120012-14 or
later and without patch 126107-28
Note: Solaris 8 and Solaris 9 are not impacted by this issue.
3. Symptoms
If the described issue occurs, applications that do several hostname
lookups, such as Oracle RAC, will experience performance degradation.
4. Workaround
To avoid this issue, the following work around can be used:
1. Backup configuration files:
# cp /etc/nsswitch.conf /etc/nsswitch.conf.cluster
# cp /etc/inet/hosts /etc/inet/hosts.cluster
# cp /etc/netmasks /etc/netmasks.cluster
2. Add Private Cluster interconnect addresses to hosts. These are the
addresses named "clprivnet0 interfaces" on all nodes in the cluster.
Obtain the names using ifconfig(1) on each node and add them to the
hosts. For example:
# ifconfig clprivnet0 | fmt
clprivnet0:
flags=1009843<UP,BROADCAST,RUNNING,MULTICAST,MULTI_BCAST,PRIVATE,IPv4>
mtu 1500 index 5
inet 172.16.4.1 netmask fffffe00 broadcast 172.16.5.255
ether 0:0:0:0:0:1
# cat >> /etc/inet/hosts <<EOS
172.16.4.1 clusternode1-priv
172.16.4.2 clusternode2-priv
EOS
3. Add private cluster interconnect netmasks to netmasks(5). For
example the following script will collect these from "cluster" before
removing it in the next step:
# ifconfig -a | \
nawk '/flags/&&!/PRIVATE/{p=0}\
/flags/&&/PRIVATE/{p=1}\
p==1&&$3 ~ /netmask/{print $2}'|\
while read i; do getent netmasks $i; done > /tmp/netmasks
# cat /tmp/netmasks
172.16.1.1 255.255.255.128
172.16.0.129 255.255.255.128
172.16.4.1 255.255.254.0
Check the output for errors. If it is correct, append these entries to
netmasks:
# cat /tmp/netmasks >> /etc/netmasks
4. Edit "nsswitch.conf" to remove "cluster" entries. Change the
relevant lines with nawk(1), verify the changes and updated
nsswitch.conf:
# egrep -n '^hosts|^netmasks' /etc/nsswitch.conf
hosts: cluster files dns nisplus dns
netmasks: cluster files nisplus
# nawk '/^(hosts|netmasks)/&&/cluster/ \
{gsub(/cluster/, "")}{print}' /etc/nsswitch.conf > \
/tmp/nsswitch.conf
# diff /etc/nsswitch.conf /tmp/nsswitch.conf
28c28
< hosts: cluster files files dns nisplus dns
---
> hosts: files files dns nisplus dns
42c42
< netmasks: cluster files nisplus
---
> netmasks: files nisplus
# cat /tmp/nsswitch.conf > /etc/nsswitch.conf
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris Cluster 3.2 (for Solaris 10) with patch 126106-27 or
later
x86 Platform
* Solaris Cluster 3.2 (for Solaris 10) with patch 126107-28 or
later
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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