Security update for xen (important)

This update for xen to version 4.5.3 fixes the several issues.

These security issues were fixed:

• CVE-2016-6258: Potential privilege escalation in PV guests (XSA-182)
  (bsc#988675).
• CVE-2016-6259: Missing SMAP whitelisting in 32-bit exception / event
  delivery (XSA-183) (bsc#988676).
• CVE-2016-5337: The megasas_ctrl_get_info function allowed local guest OS
  administrators to obtain sensitive host memory information via vectors
  related to reading device control information (bsc#983973).
• CVE-2016-5338: The (1) esp_reg_read and (2) esp_reg_write functions
  allowed local guest OS administrators to cause a denial of service (QEMU
  process crash) or execute arbitrary code on the host via vectors related
  to the information transfer buffer (bsc#983984).
• CVE-2016-5238: The get_cmd function in hw/scsi/esp.c might have allowed
  local guest OS administrators to cause a denial of service
  (out-of-bounds write and QEMU process crash) via vectors related to
  reading from the information transfer buffer in non-DMA mode
  (bsc#982960).
• CVE-2016-4453: The vmsvga_fifo_run function allowed local guest OS
  administrators to cause a denial of service (infinite loop and QEMU
  process crash) via a VGA command (bsc#982225).
• CVE-2016-4454: The vmsvga_fifo_read_raw function allowed local guest OS
  administrators to obtain sensitive host memory information or cause a
  denial of service (QEMU process crash) by changing FIFO registers and
  issuing a VGA command, which triggered an out-of-bounds read
  (bsc#982224).
• CVE-2016-5126: Heap-based buffer overflow in the iscsi_aio_ioctl
  function allowed local guest OS users to cause a denial of service (QEMU
  process crash) or possibly execute arbitrary code via a crafted iSCSI
  asynchronous I/O ioctl call (bsc#982286).
• CVE-2016-5105: Stack information leakage while reading configuration
  (bsc#982024).
• CVE-2016-5106: Out-of-bounds write while setting controller properties
  (bsc#982025).
• CVE-2016-5107: Out-of-bounds read in megasas_lookup_frame() function
  (bsc#982026).
• CVE-2016-4963: The libxl device-handling allowed local guest OS users
  with access to the driver domain to cause a denial of service
  (management tool confusion) by manipulating information in the backend
  directories in xenstore (bsc#979670).
• CVE-2016-4962: The libxl device-handling allowed local OS guest
  administrators to cause a denial of service (resource consumption or
  management facility confusion) or gain host OS privileges by
  manipulating information in guest controlled areas of xenstore
  (bsc#979620).
• CVE-2016-4952: Out-of-bounds access issue in pvsci_ring_init_msg/data
  routines (bsc#981276).
• CVE-2014-3672: The qemu implementation in libvirt Xen allowed local
  guest OS users to cause a denial of service (host disk consumption) by
  writing to stdout or stderr (bsc#981264).
• CVE-2016-4441: The get_cmd function in the 53C9X Fast SCSI Controller
  (FSC) support did not properly check DMA length, which allowed local
  guest OS administrators to cause a denial of service (out-of-bounds
  write and QEMU process crash) via unspecified vectors, involving an SCSI
  command (bsc#980724).
• CVE-2016-4439: The esp_reg_write function in the 53C9X Fast SCSI
  Controller (FSC) support did not properly check command buffer length,
  which allowed local guest OS administrators to cause a denial of service
  (out-of-bounds write and QEMU process crash) or potentially execute
  arbitrary code on the host via unspecified vectors (bsc#980716).
• CVE-2016-3710: The VGA module improperly performed bounds checking on
  banked access to video memory, which allowed local guest OS
  administrators to execute arbitrary code on the host by changing access
  modes after setting the bank register, aka the "Dark Portal" issue
  (bsc#978164).
• CVE-2016-3960: Integer overflow in the x86 shadow pagetable code allowed
  local guest OS users to cause a denial of service (host crash) or
  possibly gain privileges by shadowing a superpage mapping (bsc#974038).
• CVE-2016-3159: The fpu_fxrstor function in arch/x86/i387.c did not
  properly handle writes to the hardware FSW.ES bit when running on AMD64
  processors, which allowed local guest OS users to obtain sensitive
  register content information from another guest by leveraging pending
  exception and mask bits (bsc#973188).
• CVE-2016-3158: The xrstor function did not properly handle writes to the
  hardware FSW.ES bit when running on AMD64 processors, which allowed
  local guest OS users to obtain sensitive register content information
  from another guest by leveraging pending exception and mask bits
  (bsc#973188).
• CVE-2016-4037: The ehci_advance_state function in hw/usb/hcd-ehci.c
  allowed local guest OS administrators to cause a denial of service
  (infinite loop and CPU consumption) via a circular split isochronous
  transfer descriptor (siTD) list (bsc#976111).
• CVE-2016-4020: The patch_instruction function did not initialize the
  imm32 variable, which allowed local guest OS administrators to obtain
  sensitive information from host stack memory by accessing the Task
  Priority Register (TPR) (bsc#975907).
• CVE-2016-4001: Buffer overflow in the stellaris_enet_receive function,
  when the Stellaris ethernet controller is configured to accept large
  packets, allowed remote attackers to cause a denial of service (QEMU
  crash) via a large packet (bsc#975130).
• CVE-2016-4002: Buffer overflow in the mipsnet_receive function, when the
  guest NIC is configured to accept large packets, allowed remote
  attackers to cause a denial of service (memory corruption and QEMU
  crash) or possibly execute arbitrary code via a packet larger than 1514
  bytes (bsc#975138).
• bsc#978295: x86 software guest page walk PS bit handling flaw (XSA-176)
• CVE-2016-5403: virtio: unbounded memory allocation on host via guest
  leading to DoS (XSA-184) (bsc#990923)
• CVE-2016-6351: scsi: esp: OOB write access in esp_do_dma (bsc#990843)

These non-security issues were fixed:

• bsc#986586: Out of memory (oom) during boot on "modprobe xenblk" (non
  xen kernel)

• bsc#900418: Dump cannot be performed on SLES12 XEN

• bsc#953339: Implement SUSE specific unplug protocol for emulated PCI
  devices in PVonHVM guests to qemu-xen-upstream

• bsc#953362: Implement SUSE specific unplug protocol for emulated PCI
  devices in PVonHVM guests to qemu-xen-upstream

• bsc#953518: Implement SUSE specific unplug protocol for emulated PCI
  devices in PVonHVM guests to qemu-xen-upstream

• bsc#984981: Implement SUSE specific unplug protocol for emulated PCI
  devices in PVonHVM guests to qemu-xen-upstream

• bsc#954872: Script block-dmmd not working as expected - libxl: error:
  libxl_dm.c (Additional fixes)

• bsc#982695: qemu fails to boot HVM guest from xvda

• bsc#958848: HVM guest crash at
  /usr/src/packages/BUILD/xen-4.4.2-testing/obj/default/balloon/balloon.c:407

• bsc#949889: Fail to install 32-bit paravirt VM under SLES12SP1Beta3 XEN

• bsc#954872: Script block-dmmd not working as expected - libxl: error:
  libxl_dm.c (another modification)

• bsc#961600: Poor performance when Xen HVM domU configured with max
  memory greater than current memory

• bsc#963161: Windows VM getting stuck during load while a VF is assigned
  to it after upgrading to latest maintenance updates

• bsc#976058: Xen error running simple HVM guest (Post Alpha 2 xen+qemu)

• bsc#973631: AWS EC2 kdump issue

• bsc#957986: Indirect descriptors are not compatible with Amazon block
  backend

• bsc#964427: Discarding device blocks: failed - Input/output error

• bsc#985503: Fixed vif-route

• bsc#978413: PV guest upgrade from SLES11 SP4 to SLES 12 SP2 alpha3 failed