Article ID: 112207, created on Sep 5, 2011, last review on Apr 18, 2012

  • Applies to:
  • Virtuozzo containers for Linux 4.6

Release notes

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Synopsis:          New Parallels Virtuozzo Containers 4.6 kernel provides an
                   update with security and stability fixes.
Issue date:        2011-09-06
Product:           Parallels Virtuozzo Containers 4.6
Keywords:          'bugfixing' 'stability' 'security'

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This document provides information on the new Parallels Virtuozzo Containers 4.6
kernel, version 2.6.18-028stab093.2.

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TABLE OF CONTENTS

1. About This Release
2. Update Description
3. Obtaining New Kernel
4. Installing New Kernel
5. Required RPMs
6. References

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1. ABOUT THIS RELEASE

The current update for the Parallels Virtuozzo Containers 4.6 kernel provides a
new kernel based on the Red Hat 5.7 kernel (2.6.18-274.el5). The updated
kernel includes a number of security and stability fixes.

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2. UPDATES DESCRIPTION

This update contains fixes for the following issues:

* Migrating a 64-bit Container based on a modern OS template (e.g., Red Hat
  Enterprise Linux 6) could fail due to an incorrect vDSO data restoration
  (PCLIN-29353).

* A UDP-based OpenVPN connection inside a Container could cause a kernel panic
  (OVZ# 1872).

* The "netfilter" cache was optimized, which could affect iptables rules,
  in particular, the iptable_nat module (OVZ# 1861).

* The "nr_active" and "nr_inactive" fields were reversed in the /proc/vmstat
  output.

This update also contains fixes for the following security issues:

* A flaw allowed the tc_fill_qdisc() function in the Linux kernel's packet
  scheduler API implementation to be called on built-in qdisc structures.
  A local, unprivileged user could use this flaw to trigger a NULL pointer
  dereference, resulting in a denial of service. (CVE-2011-2525, Moderate)

* A flaw was found in the way space was allocated in the Linux kernel's
  Global File System 2 (GFS2) implementation. If the file system was almost
  full, and a local, unprivileged user made an fallocate() request, it could
  result in a denial of service. Note: Setting quotas to prevent users from
  using all available disk space would prevent exploitation of this flaw.
  (CVE-2011-2689, Moderate)

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3. OBTAINING NEW KERNEL

You can download and install this kernel update using the vzup2date utility
included in the Parallels Virtuozzo Containers 4.6 distribution set.

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4. INSTALLING NEW KERNEL

To install the update, do the following:

I. Use the "rpm -ihv" command to install the new kernel and Virtuozzo modules.

# rpm -ivh vzkernel-2.6.18-028stab093.2.i686.rpm \
vzmodules-2.6.18-028stab093.2.i686.rpm
Preparing...                ################################# [100%]
    1:vzkernel               ################################# [50%]
    2:vzmodules              ################################# [100%]

    Please DO NOT USE the "rpm -Uhv" command to install the kernel. Otherwise,
    all the kernels previously installed on your system may be removed from
    the Hardware Node.

II. You can adjust your boot loader configuration file to have the new kernel
    loaded by default. If you use the LILO bootloader, please do not forget to
    execute the 'lilo' command to write the changes to the boot sector:

     # lilo
     Added Virtuozzo2 *
     Added Virtuozzo1
     Added linux
     Added linux-up

III. Reboot your computer with the "shutdown -r now" command to boot the new
     kernel.

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5. REQUIRED RPMS

Depending on the processor installed on the Hardware Node, the following RPM
packages are included in the kernel update:

x86 kernels:

- SMP:
   vzkernel-2.6.18-028stab093.2.i686.rpm
   vzmodules-2.6.18-028stab093.2.i686.rpm

- Enterprise:
   vzkernel-ent-2.6.18-028stab093.2.i686.rpm
   vzmodules-ent-2.6.18-028stab093.2.i686.rpm

- Enterprise with the 4GB split feature disabled:
   vzkernel-PAE-2.6.18-028stab093.2.i686.rpm
   vzmodules-PAE-2.6.18-028stab093.2.i686.rpm


x86_64 kernels:

- SMP:
   vzkernel-2.6.18-028stab093.2.x86_64.rpm
   vzmodules-2.6.18-028stab093.2.x86_64.rpm

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6. REFERENCES

https://rhn.redhat.com/errata/RHSA-2011-1065.html
https://www.redhat.com/security/data/cve/CVE-2011-2525.html
https://www.redhat.com/security/data/cve/CVE-2011-2689.html

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Copyright (c) 1999-2011 Parallels Holdings, Ltd. and its affiliates. All rights
reserved.

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