[LU-8134] kernel update [RHEL7.2 3.10.0-327.18.2.el7]

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

Security Fix(es):

• A flaw was found in the way the Linux kernel's ASN.1 DER decoder processed
  certain certificate files with tags of indefinite length. A local, unprivileged
  user could use a specially crafted X.509 certificate DER file to crash the
  system or, potentially, escalate their privileges on the system. (CVE-2016-0758,
  Important)

Bug Fix(es):

• Under certain conditions, the migration threads could race with the CPU
  hotplug, which could cause a deadlock. A set of patches has been provided to fix
  this bug, and the deadlock no longer occurs in the system. (BZ#1299338)

• A bug in the code that cleans up revoked delegations could previously cause a
  soft lockup in the NFS server. This patch fixes the underlying source code, so
  the lockup no longer occurs. (BZ#1311582)

• The second attempt to reload Common Application Programming Interface (CAPI)
  devices on the little-endian variant of IBM Power Systems previously failed. The
  provided set of patches fixes this bug, and reloading works as intended.
  (BZ#1312396)

• Due to inconsistencies in page size of IOMMU, the NVMe device, and the kernel,
  the BUG_ON signal previously occurred in the nvme_setup_prps() function, leading
  to the system crash while setting up the DMA transfer. The provided patch sets
  the default NVMe page size to 4k, thus preventing the system crash. (BZ#1312399)

• Previously, on a system using the Infiniband mlx5 driver used for the SRP
  stack, a hard lockup previously occurred after the kernel exceeded time with
  lock held with interrupts blocked. As a consequence, the system panicked. This
  update fixes this bug, and the system no longer panics in this situation.
  (BZ#1313814)

• On the little-endian variant of IBM Power Systems, the kernel previously
  crashed in the bitmap_weight() function while running the memory affinity
  script. The provided patch fortifies the topology setup and prevents sd->child
  from being set to NULL when it is already NULL. As a result, the memory affinity
  script runs successfully. (BZ#1316158)

• When a KVM guest wrote random values to the special-purpose registers (SPR)
  Instruction Authority Mask Register (IAMR), the guest and the corresponding QEMU
  process previously hung. This update adds the code which sets SPRs to a suitable
  neutral value on guest exit, thus fixing this bug. (BZ#1316636)

• Under heavy iSCSI traffic load, the system previously panicked due to a race
  in the locking code leading to a list corruption. This update fixes this bug,
  and the system no longer panics in this situation. (BZ#1316812)

• During SCSI exception handling (triggered by some irregularities), the driver
  could previously use an already retired SCSI command. As a consequence, a kernel
  panic or data corruption occurred. The provided patches fix this bug, and
  exception handling now proceeds successfully. (BZ#1316820)

• When the previously opened /dev/tty, which pointed to a pseudo terminal (pty)
  pair, was the last file closed, a kernel crash could previously occur. The
  underlying source code has been fixed, preventing this bug. (BZ#1320297)

• Previously, when using VPLEX and FCoE via the bnx2fc driver, different degrees
  of data corruption occurred. The provided patch fixes the FCP Response (RSP)
  residual parsing in bnx2fc, which prevents the aforementioned corruption.
  (BZ#1322279)

Bugs fixed (https://bugzilla.redhat.com/):

1300257 - CVE-2016-0758 kernel: tags with indefinite length can corrupt pointers in asn1_find_indefinite_length()