kernel, perf, python security update

CentOS Errata and Security Advisory CESA-2014:1997

• A flaw was found in the way the Linux kernel handled GS segment register
  base switching when recovering from a #SS (stack segment) fault on an
  erroneous return to user space. A local, unprivileged user could use this
  flaw to escalate their privileges on the system. (CVE-2014-9322, Important)

• A flaw was found in the way the Linux kernel’s SCTP implementation
  handled malformed or duplicate Address Configuration Change Chunks
  (ASCONF). A remote attacker could use either of these flaws to crash the
  system. (CVE-2014-3673, CVE-2014-3687, Important)

• A flaw was found in the way the Linux kernel’s SCTP implementation
  handled the association’s output queue. A remote attacker could send
  specially crafted packets that would cause the system to use an excessive
  amount of memory, leading to a denial of service. (CVE-2014-3688,
  Important)

• A stack overflow flaw caused by infinite recursion was found in the way
  the Linux kernel’s UDF file system implementation processed indirect ICBs.
  An attacker with physical access to the system could use a specially
  crafted UDF image to crash the system. (CVE-2014-6410, Low)

• It was found that the Linux kernel’s networking implementation did not
  correctly handle the setting of the keepalive socket option on raw sockets.
  A local user able to create a raw socket could use this flaw to crash the
  system. (CVE-2012-6657, Low)

• It was found that the parse_rock_ridge_inode_internal() function of the
  Linux kernel’s ISOFS implementation did not correctly check relocated
  directories when processing Rock Ridge child link (CL) tags. An attacker
  with physical access to the system could use a specially crafted ISO image
  to crash the system or, potentially, escalate their privileges on the
  system. (CVE-2014-5471, CVE-2014-5472, Low)

Red Hat would like to thank Andy Lutomirski for reporting CVE-2014-9322.
The CVE-2014-3673 issue was discovered by Liu Wei of Red Hat.

Bug fixes:

• This update fixes a race condition issue between the sock_queue_err_skb
  function and sk_forward_alloc handling in the socket error queue
  (MSG_ERRQUEUE), which could occasionally cause the kernel, for example when
  using PTP, to incorrectly track allocated memory for the error queue, in
  which case a traceback would occur in the system log. (BZ#1155427)

• The zcrypt device driver did not detect certain crypto cards and the
  related domains for crypto adapters on System z and s390x architectures.
  Consequently, it was not possible to run the system on new crypto hardware.
  This update enables toleration mode for such devices so that the system
  can make use of newer crypto hardware. (BZ#1158311)

• After mounting and unmounting an XFS file system several times
  consecutively, the umount command occasionally became unresponsive.
  This was caused by the xlog_cil_force_lsn() function that was not waiting
  for completion as expected. With this update, xlog_cil_force_lsn() has been
  modified to correctly wait for completion, thus fixing this bug.
  (BZ#1158325)

• When using the ixgbe adapter with disabled LRO and the tx-usec or rs-usec
  variables set to 0, transmit interrupts could not be set lower than the
  default of 8 buffered tx frames. Consequently, a delay of TCP transfer
  occurred. The restriction of a minimum of 8 buffered frames has been
  removed, and the TCP delay no longer occurs. (BZ#1158326)

• The offb driver has been updated for the QEMU standard VGA adapter,
  fixing an incorrect displaying of colors issue. (BZ#1158328)

• Under certain circumstances, when a discovered MTU expired, the IPv6
  connection became unavailable for a short period of time. This bug has been
  fixed, and the connection now works as expected. (BZ#1161418)

• A low throughput occurred when using the dm-thin driver to write to
  unprovisioned or shared chunks for a thin pool with the chunk size bigger
  than the max_sectors_kb variable. (BZ#1161420)

• Large write workloads on thin LVs could cause the iozone and smallfile
  utilities to terminate unexpectedly. (BZ#1161421)

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2014-December/083000.html

Affected packages:
kernel
kernel-abi-whitelists
kernel-debug
kernel-debug-devel
kernel-devel
kernel-doc
kernel-firmware
kernel-headers
perf
python-perf

Upstream details at:
https://access.redhat.com/errata/RHSA-2014:1997