(RHSA-2016:1341) Important: kernel-rt security and bug fix update

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

This update provides a build of the kernel-rt package for Red Hat
Enterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and
provides a number of bug fixes including:

• [netdrv] ixgbevf: fix spoofed packets with random MAC and use ether_addr_copy instead of memcpy
• [mm] mmu_notifier: fix memory corruption
• [mm] hugetlbfs: optimize when NUMA=n
• [mm] optimize put_mems_allowed() usage
• [x86] mm: suitable memory should go to ZONE_MOVABLE
• [fs] xfs: fix splice/direct-IO deadlock
• [acpi] tables: Add acpi_subtable_proc to ACPI table parsers
• [acpi] table: Add new function to get table entries
• [net] ipv6: Nonlocal bind
• [net] ipv4: bind ip_nonlocal_bind to current netns

(BZ#1332298)

Security Fix(es):

• A flaw was found in the way certain interfaces of the Linux kernel’s
  Infiniband subsystem used write() as bi-directional ioctl() replacement,
  which could lead to insufficient memory security checks when being invoked
  using the splice() system call. A local unprivileged user on a system
  with either Infiniband hardware present or RDMA Userspace Connection
  Manager Access module explicitly loaded, could use this flaw to escalate
  their privileges on the system. (CVE-2016-4565, Important)

• A race condition flaw was found in the way the Linux kernel’s SCTP
  implementation handled sctp_accept() during the processing of heartbeat
  timeout events. A remote attacker could use this flaw to prevent further
  connections to be accepted by the SCTP server running on the system,
  resulting in a denial of service. (CVE-2015-8767, Moderate)

• A flaw was found in the way the realtime kernel processed specially
  crafted ICMP echo requests. A remote attacker could use this flaw to
  trigger a sysrql function based on values in the ICMP packet, allowing them
  to remotely restart the system. Note that this feature is not enabled by
  default and requires elevated privileges to be configured. (CVE-2016-3707,
  Moderate)

Red Hat would like to thank Jann Horn for reporting CVE-2016-4565.

Bug Fix(es):

• An oops can occur in the hpsa driver while submitting ioaccel2 commands
  when the phys_disk pointer is NULL (in hpsa_scsi_ioaccel_raid_map).
  Configuration changes during I/O operations could set the phys_disk
  pointer to NULL. In this case, send the command down the RAID path for
  correct processing, avoiding the oops. (BZ#1334260)

• A faulty code merge left an extra spin_lock operation in the function
  fscache_invalidate_write(). The code has been correctly updated to remove
  this extra lock operation, which avoids a potential deadlock situation
  when looping through cache pages. (BZ#1327730)