Security update for xen (important)

This update for xen fixes several issues.

These security issues were fixed:

• CVE-2016-7094: Buffer overflow in Xen allowed local x86 HVM guest OS
  administrators on guests running with shadow paging to cause a denial of
  service via a pagetable update (bsc#995792)
• CVE-2016-7092: The get_page_from_l3e function in arch/x86/mm.c in Xen
  allowed local 32-bit PV guest OS administrators to gain host OS
  privileges via vectors related to L3 recursive pagetables (bsc#995785)
• CVE-2016-5403: Unbounded memory allocation allowed a guest administrator
  to cause a denial of service of the host (bsc#990923)
• CVE-2016-6351: The esp_do_dma function in hw/scsi/esp.c, when built with
  ESP/NCR53C9x controller emulation support, allowed local guest OS
  administrators to cause a denial of service (out-of-bounds write and
  QEMU process crash) or execute arbitrary code on the host via vectors
  involving DMA read into ESP command buffer (bsc#990843)
• CVE-2016-6258: The PV pagetable code in arch/x86/mm.c in Xen allowed
  local 32-bit PV guest OS administrators to gain host OS privileges by
  leveraging fast-paths for updating pagetable entries (bsc#988675)
• 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-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-2016-4480: The guest_walk_tables function in
  arch/x86/mm/guest_walk.c in Xen did not properly handle the Page Size
  (PS) page table entry bit at the L4 and L3 page table levels, which
  might have allowed local guest OS users to gain privileges via a crafted
  mapping of memory (bsc#978295)
• 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-2016-3158: 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-2016-4001: 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)

These non-security issues were fixed:

• bsc#985503: vif-route broken
• bsc#978413: PV guest upgrade from sles11sp4 to sles12sp2 alpha3 failed
  on sles11sp4 xen host.
• 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 > current memory
• bsc#963161: Windows VM getting stuck during load while a VF is assigned
  to it after upgrading to latest maintenance updates
• bsc#976470: Xend fails to start
• bsc#973631: AWS EC2 kdump issue