(RHSA-2012:1150) Moderate: kernel-rt security and bug fix update

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

This update fixes the following security issues:

• A memory leak flaw was found in the way the Linux kernel’s memory
  subsystem handled resource clean up in the mmap() failure path when the
  MAP_HUGETLB flag was set. A local, unprivileged user could use this flaw to
  cause a denial of service. (CVE-2012-2390, Moderate)

• A flaw was found in the way the Linux kernel’s Event Poll (epoll)
  subsystem handled resource clean up when an ELOOP error code was returned.
  A local, unprivileged user could use this flaw to cause a denial of
  service. (CVE-2012-3375, Moderate)

This update also fixes the following bugs:

• The MRG 2.1 realtime kernel lacked support for automatic memory
  reservation for the kdump kernel, as present in Red Hat Enterprise Linux
  kernels. Using the parameter crashkernel=auto on the kernel boot command
  line led to kdump being disabled because no memory was correctly reserved.
  Support for crashkernel=auto has been implemented in the 3.0 realtime
  kernel and now when the crashkernel=auto parameter is specified, machines
  with more than 4GB of RAM have the amount of memory required by the kdump
  kernel calculated and reserved. (BZ#820427)

• The current bnx2x driver in the MRG 2.1 realtime kernel had faulty
  support for the network adapter PCI ID 14e4:168e and did not work
  correctly. The bnx2x driver was updated to include support for this network
  adapter. (BZ#839037)

Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.0.36-rt57, and correct these issues. The
system must be rebooted for this update to take effect.