Security update for xen (important)

This update for xen fixes several issues.

These security issues were fixed:

• 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-2016-3158: 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-2016-3159: 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-2016-3710: 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-2016-4001: 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).
• 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-2016-4037: 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-2016-4439: 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-2016-4441: 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-2016-4453: 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-2016-4480: 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-2016-4952: Out-of-bounds access issue in pvsci_ring_init_msg/data
  routines (bsc#981276)
• 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-2016-4963: 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-2016-5105: 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-2016-5126: 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-2016-5238: 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-2016-5337: 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-2016-5403: virtio: unbounded memory allocation on host via guest
  leading to DoS (XSA-184) (bsc#990923)
• 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-2016-6351: 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-2016-6833: A use-after-free issue in the VMWARE VMXNET3 NIC device
  support allowed privileged user inside guest to crash the Qemu instance
  resulting in DoS (bsc#994775).
• CVE-2016-6834: A infinite loop during packet fragmentation in the VMWARE
  VMXNET3 NIC device support allowed privileged user inside guest to crash
  the Qemu instance resulting in DoS (bsc#994421).
• CVE-2016-6835: Buffer overflow in the VMWARE VMXNET3 NIC device support,
  causing an OOB read access (bsc#994625).
• CVE-2016-6836: VMWARE VMXNET3 NIC device allowed privileged user inside
  the guest to leak information. It occured while processing transmit(tx)
  queue, when it reaches the end of packet (bsc#994761).
• CVE-2016-6888: A integer overflow int the VMWARE VMXNET3 NIC device
  support, during the initialisation of new packets in the device, could
  have allowed a privileged user inside guest to crash the Qemu instance
  resulting in DoS (bsc#994772).
• 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-2016-7093: Xen allowed local HVM guest OS administrators to
  overwrite hypervisor memory and consequently gain host OS privileges by
  leveraging mishandling of instruction pointer truncation during
  emulation (bsc#995789)
• 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-2016-7154: Use-after-free vulnerability in the FIFO event channel
  code in Xen allowed local guest OS administrators to cause a denial of
  service (host crash) and possibly execute arbitrary code or obtain
  sensitive information via an invalid guest frame number (bsc#997731).

These non-security issues were fixed:

• bsc#991934: Hypervisor crash in csched_acct
• bsc#992224: During boot of Xen Hypervisor, failed to get contiguous
  memory for DMA
• bsc#970135: New virtualization project clock test randomly fails on Xen
• bsc#971949: xl: Support (by ignoring) xl migrate --live. xl migrations
  are always live
• bsc#990970: Add PMU support for Intel E7-8867 v4 (fam=6, model=79)
• bsc#985503: vif-route broken
• bsc#978413: PV guest upgrade from sles11sp4 to sles12sp2 alpha3 failed
  on sles11sp4 xen host.
• bsc#986586: Out of memory (oom) during boot on "modprobe xenblk" (non
  xen kernel)
• bsc#953339, bsc#953362, bsc#953518, bsc#984981: Implement SUSE specific
  unplug protocol for emulated PCI devices in PVonHVM guests to
  qemu-xen-upstream
• bsc#958848: HVM guest crash at /usr/src/packages/BUILD/
  xen-4.4.2-testing/obj/default/balloon/balloon.c:407
• bsc#982695: xen-4.5.2 qemu fails to boot HVM guest from xvda
• bsc#954872: script block-dmmd not working as expected
• bsc#961600: : poor performance when Xen HVM domU configured with max
  memory > current memory
• bsc#979035: Restore xm migrate fixes for bsc#955399/ bsc#955399
• bsc#963161: Windows VM getting stuck during load while a VF is assigned
  to it
• bsc#976058: Xen error running simple HVM guest (Post Alpha 2 xen+qemu)
• bsc#957986: Indirect descriptors are not compatible with Amazon block
  backend
• bsc#973631: AWS EC2 kdump issue
• bsc#964427: Discarding device blocks failed with input/output error