Synopsis

hypervkvpd bug fix update

Type/Severity

Bug Fix Advisory

Topic

Updated hypervkvpd packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

Description

The hypervkvpd packages contain hypervkvpd, the guest Hyper-V Key-Value Pair
(KVP) daemon. Using VMbus, hypervkvpd passes basic information to the host. The
information includes guest IP address, fully qualified domain name, operating
system name, and operating system release number. An IP injection functionality
enables the user to change the IP address of a guest from the host via the
hypervkvpd daemon.

This update fixes the following bugs:

• Previously, the hypervkvpd service registered to two netlink multicast groups,
  one of which was used by the cgred service. When hypervkvpd received a netlink
  message, it was interpreted blindly as its own. As a consequence, hypervkvpd
  terminated unexpectedly with a segmentation fault. After this update, hypervkvpd
  now registers only to its own netlink multicast group and verifies the type of
  the incoming netlink message. Using hypervkvpd when the cgred service is running
  no longer leads to a segmentation fault. (BZ#920032)
  
• Prior to this update, the hypervkvpd init script did not check if Hyper-V
  driver modules were loaded into the kernel. If hypervkvpd was installed, it
  started automatically on system boot, even if the system was not running as a
  guest machine on a Hyper-V hypervisor. Verification has been added to the
  hypervkvpd init script to determine whether Hyper-V driver modules are loaded
  into the kernel. As a result, if the modules are not loaded into the kernel,
  hypervkvpd now does not start, but displays a message that proper driver modules
  are not loaded. (BZ#962565)
  
• Previously, hypervkvpd was not built with sufficiently secure compiler
  options, which could, consequently, make the compiled code vulnerable. The
  hypervkvpd daemon has been built with full read-only relocation (RELRO) and
  position-independent executable (PIE) flags. As a result, the compiled code is
  more secure and better guarded against possible buffer overflows. (BZ#977861)
  
• When using the Get-VMNetworkAdapter command to query a virtual machine
  network adapter, each subnet string has to be separated by a semicolon.
  Due to a bug in the IPv6 subnet enumeration code, the IPv6 addresses
  were not listed. A patch has been applied, and the IPv6 subnet
  enumeration now works as expected. (BZ#983851)
  

Users of hypervkvpd are advised to upgrade to these updated packages, which fix
these bugs. After updating the hypervkvpd packages, rebooting all guest machines
is recommended, otherwise the Microsoft Windows server with Hyper-V might not be
able to get information from these guest machines.

Solution

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

This update is available via the Red Hat Network. Details on how to use the Red
Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 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 Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386

Fixes

• BZ - 920032 - hypervkvpd segfault when cgred is running
• BZ - 965944 - [Hyper-V][CoverityScan][RHEL6.5]Unchecked_value, null returns and resource leak
• BZ - 978300 - [Hyper-V][RHEL6.5]Failed to start the hypervkvpd service with error "Hyper-V drivers are not loaded"
• BZ - 983851 - hypervkvpd: Fix a bug in IPV6 subnet enumeration

CVEs

(none)

References

(none)

Red Hat Enterprise Linux Server 6

SRPM
hypervkvpd-0-0.12.el6.src.rpm	SHA-256: 4470c14a49b56df9fa210564577c485a6a8230bd3eca78cec061c1e28c9e811b
x86_64
hypervkvpd-0-0.12.el6.x86_64.rpm	SHA-256: 6f602151ab26cf930e6d9dc1cea5675c6b3b7300acf7bcf1609bf3d71c10db67
hypervkvpd-debuginfo-0-0.12.el6.x86_64.rpm	SHA-256: a5ff5fe4a0872ecac2bc6b49b352c958c49eee7dcdc778e664cc383fc76b878e
i386
hypervkvpd-0-0.12.el6.i686.rpm	SHA-256: 5ff455598f074cda593897232c30aafc8cfa1fc9ce465156919bbc653242677c
hypervkvpd-debuginfo-0-0.12.el6.i686.rpm	SHA-256: 71b2630463c42dd052bc50162938aa00b58357869998313293c71d956aa2d815

Red Hat Enterprise Linux Workstation 6

SRPM
hypervkvpd-0-0.12.el6.src.rpm	SHA-256: 4470c14a49b56df9fa210564577c485a6a8230bd3eca78cec061c1e28c9e811b
x86_64
hypervkvpd-0-0.12.el6.x86_64.rpm	SHA-256: 6f602151ab26cf930e6d9dc1cea5675c6b3b7300acf7bcf1609bf3d71c10db67
hypervkvpd-debuginfo-0-0.12.el6.x86_64.rpm	SHA-256: a5ff5fe4a0872ecac2bc6b49b352c958c49eee7dcdc778e664cc383fc76b878e
i386
hypervkvpd-0-0.12.el6.i686.rpm	SHA-256: 5ff455598f074cda593897232c30aafc8cfa1fc9ce465156919bbc653242677c
hypervkvpd-debuginfo-0-0.12.el6.i686.rpm	SHA-256: 71b2630463c42dd052bc50162938aa00b58357869998313293c71d956aa2d815

Red Hat Enterprise Linux Desktop 6

SRPM
hypervkvpd-0-0.12.el6.src.rpm	SHA-256: 4470c14a49b56df9fa210564577c485a6a8230bd3eca78cec061c1e28c9e811b
x86_64
hypervkvpd-0-0.12.el6.x86_64.rpm	SHA-256: 6f602151ab26cf930e6d9dc1cea5675c6b3b7300acf7bcf1609bf3d71c10db67
hypervkvpd-debuginfo-0-0.12.el6.x86_64.rpm	SHA-256: a5ff5fe4a0872ecac2bc6b49b352c958c49eee7dcdc778e664cc383fc76b878e
i386
hypervkvpd-0-0.12.el6.i686.rpm	SHA-256: 5ff455598f074cda593897232c30aafc8cfa1fc9ce465156919bbc653242677c
hypervkvpd-debuginfo-0-0.12.el6.i686.rpm	SHA-256: 71b2630463c42dd052bc50162938aa00b58357869998313293c71d956aa2d815

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
hypervkvpd-0-0.12.el6.src.rpm	SHA-256: 4470c14a49b56df9fa210564577c485a6a8230bd3eca78cec061c1e28c9e811b
x86_64
hypervkvpd-0-0.12.el6.x86_64.rpm	SHA-256: 6f602151ab26cf930e6d9dc1cea5675c6b3b7300acf7bcf1609bf3d71c10db67
hypervkvpd-debuginfo-0-0.12.el6.x86_64.rpm	SHA-256: a5ff5fe4a0872ecac2bc6b49b352c958c49eee7dcdc778e664cc383fc76b878e

Red Hat Enterprise Linux Server from RHUI 6

SRPM
hypervkvpd-0-0.12.el6.src.rpm	SHA-256: 4470c14a49b56df9fa210564577c485a6a8230bd3eca78cec061c1e28c9e811b
x86_64
hypervkvpd-0-0.12.el6.x86_64.rpm	SHA-256: 6f602151ab26cf930e6d9dc1cea5675c6b3b7300acf7bcf1609bf3d71c10db67
hypervkvpd-debuginfo-0-0.12.el6.x86_64.rpm	SHA-256: a5ff5fe4a0872ecac2bc6b49b352c958c49eee7dcdc778e664cc383fc76b878e
i386
hypervkvpd-0-0.12.el6.i686.rpm	SHA-256: 5ff455598f074cda593897232c30aafc8cfa1fc9ce465156919bbc653242677c
hypervkvpd-debuginfo-0-0.12.el6.i686.rpm	SHA-256: 71b2630463c42dd052bc50162938aa00b58357869998313293c71d956aa2d815