(RHSA-2016:1301) Important: kernel-rt security, bug fix, and enhancement update

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

The following packages have been upgraded to a newer upstream version:
kernel-rt (3.10.0-327.22.1). This version provides a number of bug fixes
and enhancements, 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#1335747)

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 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):

• Previously, configuration changes to the Hewlett Packard Smart Array
  (HPSA) driver during I/O operations could set the phys_disk pointer to
  NULL. Consequently, kernel oops could occur while the HPSA driver was
  submitting ioaccel2 commands. An upstream patch has been provided to fix
  this bug, and the oops in the hpsa_scsi_ioaccel_raid_map() function no
  longer occurs. (BZ#1335411)

• In a previous code update one extra spin_lock operation was left
  untouched. Consequently, a deadlock could occur when looping through cache
  pages. With this update, the extra lock operation has been removed from
  the source code and the deadlock no longer occurs in the described
  situation. (BZ#1327073)