kernel, perf, python security update

CentOS Errata and Security Advisory CESA-2012:1064

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

• A NULL pointer dereference flaw was found in the nf_ct_frag6_reasm()
  function in the Linux kernel’s netfilter IPv6 connection tracking
  implementation. A remote attacker could use this flaw to send
  specially-crafted packets to a target system that is using IPv6 and also
  has the nf_conntrack_ipv6 kernel module loaded, causing it to crash.
  (CVE-2012-2744, Important)

• A flaw was found in the way the Linux kernel’s key management facility
  handled replacement session keyrings on process forks. A local,
  unprivileged user could use this flaw to cause a denial of service.
  (CVE-2012-2745, Moderate)

Red Hat would like to thank an anonymous contributor working with the
Beyond Security SecuriTeam Secure Disclosure program for reporting
CVE-2012-2744.

This update also fixes the following bugs:

• Previously introduced firmware files required for new Realtek chipsets
  contained an invalid prefix (“rtl_nic_”) in the file names, for example
  “/lib/firmware/rtl_nic/rtl_nic_rtl8168d-1.fw”. This update corrects these
  file names. For example, the aforementioned file is now correctly named
  “/lib/firmware/rtl_nic/rtl8168d-1.fw”. (BZ#832359)

• This update blacklists the ADMA428M revision of the 2GB ATA Flash Disk
  device. This is due to data corruption occurring on the said device when
  the Ultra-DMA 66 transfer mode is used. When the
  “libata.force=5:pio0,6:pio0” kernel parameter is set, the aforementioned
  device works as expected. (BZ#832363)

• On Red Hat Enterprise Linux 6, mounting an NFS export from a Windows 2012
  server failed due to the fact that the Windows server contains support for
  the minor version 1 (v4.1) of the NFS version 4 protocol only, along with
  support for versions 2 and 3. The lack of the minor version 0 (v4.0)
  support caused Red Hat Enterprise Linux 6 clients to fail instead of
  rolling back to version 3 as expected. This update fixes this bug and
  mounting an NFS export works as expected. (BZ#832365)

• On ext4 file systems, when fallocate() failed to allocate blocks due to
  the ENOSPC condition (no space left on device) for a file larger than 4 GB,
  the size of the file became corrupted and, consequently, caused file system
  corruption. This was due to a missing cast operator in the
  “ext4_fallocate()” function. With this update, the underlying source code
  has been modified to address this issue, and file system corruption no
  longer occurs. (BZ#833034)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2012-July/080893.html

Affected packages:
kernel
kernel-debug
kernel-debug-devel
kernel-devel
kernel-doc
kernel-firmware
kernel-headers
perf
python-perf

Upstream details at:
https://access.redhat.com/errata/RHSA-2012:1064