Red Hat Enterprise MRG 2.1 RHSA-2012:1150-01 Moderate Kernel-RT DOS Issues

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.