kernel security update

CentOS Errata and Security Advisory CESA-2013:1034

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

This update fixes the following security issues:

• Information leaks in the Linux kernel could allow a local, unprivileged
  user to leak kernel memory to user-space. (CVE-2012-6544, CVE-2012-6545,
  CVE-2013-3222, CVE-2013-3224, CVE-2013-3231, CVE-2013-3235, Low)

• An information leak was found in the Linux kernel’s POSIX signals
  implementation. A local, unprivileged user could use this flaw to bypass
  the Address Space Layout Randomization (ASLR) security feature.
  (CVE-2013-0914, Low)

• A heap-based buffer overflow in the way the tg3 Ethernet driver parsed
  the vital product data (VPD) of devices could allow an attacker with
  physical access to a system to cause a denial of service or, potentially,
  escalate their privileges. (CVE-2013-1929, Low)

This update also fixes the following bugs:

• Previously on system boot, devices with associated Reserved Memory Region
  Reporting (RMRR) information had lost their RMRR information after they
  were removed from the static identity (SI) domain. Consequently, a system
  unexpectedly terminated in an endless loop due to unexpected NMIs triggered
  by DMA errors. This problem was observed on HP ProLiant Generation 7 (G7)
  and 8 (Gen8) systems. This update prevents non-USB devices that have RMRR
  information associated with them from being placed into the SI domain
  during system boot. HP ProLiant G7 and Gen8 systems that contain devices
  with the RMRR information now boot as expected. (BZ#957606)

• Previously, the kernel’s futex wait code used timeouts that had
  granularity in milliseconds. Also, when passing these timeouts to system
  calls, the kernel converted the timeouts to “jiffies”. Consequently,
  programs could time out inaccurately which could lead to significant
  latency problems in certain environments. This update modifies the futex
  wait code to use a high-resolution timer (hrtimer) so the timeout
  granularity is now in microseconds. Timeouts are no longer converted to
  “jiffies” when passed to system calls. Timeouts passed to programs are now
  accurate and the programs time out as expected. (BZ#958021)

• A recent change modified the size of the task_struct structure in the
  floating point unit (fpu) counter. However, on Intel Itanium systems, this
  change caused the kernel Application Binary Interface (kABI) to stop
  working properly when a previously compiled module was loaded, resulting in
  a kernel panic. With this update the change causing this bug has been
  reverted so the bug can no longer occur. (BZ#966878)

• The cxgb4 driver previously did not clear data structures used for
  firmware requests. Consequently, when initializing some Chelsio’s
  Terminator 4 (T4) adapters, a probe request could fail because the request
  was incompatible with the adapter’s firmware. This update modifies the
  cxgb4 driver to properly initialize firmware request structures before
  sending a request to the firmware and the problem no longer occurs.
  (BZ#971872)

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/2013-July/082007.html

Affected packages:
kernel
kernel-PAE
kernel-PAE-devel
kernel-debug
kernel-debug-devel
kernel-devel
kernel-doc
kernel-headers
kernel-xen
kernel-xen-devel

Upstream details at:
https://access.redhat.com/errata/RHSA-2013:1034