RHBA-2016:1411 - Bug Fix Advisory

Topic

Updated nfs-utils packages that fix two bugs are now available for Red Hat Enterprise Linux 6.

Description

The nfs-utils packages provide a daemon for the kernel Network File System (NFS) server and related tools, which provides better performance than the traditional Linux NFS server used by most users. These packages also contain the mount.nfs, umount.nfs, and showmount programs.

This update fixes the following bugs:

• Previously, the rpc.mountd service became unresponsive in the write() system call when rpc.mountd received an excessive amount of requests and the read() function was not used for reading them. Consequently, NFS mounts were not created. With this update, rpc.mountd uses non-blocking mode on the write() system calls. Now, rpc.mountd times out and the NFS mounts are no longer blocked. (BZ#1350702)
• Previously, the source code contained logic to unconditionally delete existing on-disk monitor records when the rpc.statd service received a new request to monitor the same host name. As a consequence, rpc.statd logged a harmless error message if the monitor file did not already exist: "Failed to delete: could not stat original file /var/lib/nfs/statd/sm/[...]: No such file or directory". A patch has been applied to fix this bug, and the harmless error message no longer appears in the described situation. (BZ#1351259)

Users of nfs-utils are advised to upgrade to these updated packages, which fix these bugs. After installing this update, the nfs service will be restarted automatically.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 1350702 - Back port of bz 1163891 required as rpc.mountd can be blocked by a bad client

CVEs

(none)

References

• http://www.redhat.com/security/updates/classification/#normal