kernel-2.6.32-642.4.2.el6

The kernel package contains the Linux kernel (vmlinuz), the core of any
Linux operating system. The kernel handles the basic functions
of the operating system: memory allocation, process allocation, device
input and output, etc.

Security issues fixed with this release:

CVE-2016-5696
net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for man-in-the-middle attackers to hijack TCP sessions via a blind in-window attack.

Fixed bugs:

* When loading the Direct Rendering Manager (DRM) kernel module, the kernel panicked if DRM was previously unloaded. The kernel panic was caused by a memory leak of the ID Resolver (IDR2). With this update, IDR2 is loaded during kernel boot, and the kernel panic no longer occurs in the described scenario.
* When more than one process attempted to use the "configfs" directory entry at the same time, a kernel panic in some cases occurred. With this update, a race condition between a directory entry and a lookup operation has been fixed. As a result, the kernel no longer panics in the described scenario.
* When shutting down the system by running the halt -p command, a kernel panic occurred due to a conflict between the kernel offlining CPUs and the sched command, which used the sched group and the sched domain data without first checking the data. The underlying source code has been fixed by adding a check to avoid the conflict. As a result, the described scenario no longer results in a kernel panic.
* In some cases, running the ipmitool command caused a kernel panic due to a race condition in the ipmi message handler. This update fixes the race condition, and the kernel panic no longer occurs in the described scenario.
* Previously, multiple Very Secure FTP daemon (vsftpd) processes on a directory with a large number of files led to a high contention rate on each inode's spinlock, which caused excessive CPU usage. With this update, a spinlock to protect a single memory-to-memory copy has been removed from the ext4_getattr() function. As a result, system CPU usage has been reduced and is no longer excessive in the described situation.
* When the gfs2_grow utility is used to extend Global File System 2 (GFS2), the next block allocation causes the GFS2 kernel module to re-read its resource group index. If multiple processes in the GFS2 module raced to do the same thing, one process sometimes overwrote a valid object pointer with an invalid pointer, which caused either a kernel panic or a file system corruption. This update ensures that the resource group object pointer is not overwritten. As a result, neither kernel panic nor file system corruption occur in the described scenario.
* Previously, the SCSI Remote Protocol over InfiniBand (IB-SRP) was disabled due to a bug in the srp_queue() function. As a consequence, an attempt to enable the Remote Direct Memory Access (RDMA) at boot caused the kernel to crash. With this update, srp_queue() has been fixed, and the system now boots as expected when RDMA is enabled.

Enhancements:

* This update optimizes the efficiency of the Transmission Control Protocol (TCP) when the peer is using a window under 537 bytes in size. As a result, devices that use maximum segment size (MSS) of 536 bytes or fewer will experience improved network performance.