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[Launchpad Bug Tracker <1872401@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.15.0-135.139

---------------
linux (4.15.0-135.139) bionic; urgency=medium

  * bionic/linux: 4.15.0-135.139 -proposed tracker (LP: #1912223)

  * [drm:qxl_enc_commit [qxl]] *ERROR* head number too large or missing monitors
    config: (LP: #1908219)
    - qxl: remove qxl_io_log()
    - qxl: move qxl_send_monitors_config()
    - qxl: hook monitors_config updates into crtc, not encoder.

  * Touchpad not detected on ByteSpeed C15B laptop (LP: #1906128)
    - Input: i8042 - add ByteSpeed touchpad to noloop table

  * vmx_nm_test in ubuntu_kvm_unit_tests interrupted on X-oracle-4.15 /
    B-oracle-4.15 / X-KVM / B-KVM (LP: #1872401)
    - KVM: nVMX: Always reflect #NM VM-exits to L1

  * stack trace in kernel (LP: #1903596)
    - net: napi: remove useless stack trace

  * CVE-2020-27777
    - [Config]: Set CONFIG_PPC_RTAS_FILTER

  * Bionic update: upstream stable patchset 2020-12-04 (LP: #1906875)
    - regulator: defer probe when trying to get voltage from unresolved supply
    - ring-buffer: Fix recursion protection transitions between interrupt context
    - time: Prevent undefined behaviour in timespec64_to_ns()
    - nbd: don't update block size after device is started
    - btrfs: sysfs: init devices outside of the chunk_mutex
    - btrfs: reschedule when cloning lots of extents
    - genirq: Let GENERIC_IRQ_IPI select IRQ_DOMAIN_HIERARCHY
    - hv_balloon: disable warning when floor reached
    - net: xfrm: fix a race condition during allocing spi
    - perf tools: Add missing swap for ino_generation
    - ALSA: hda: prevent undefined shift in snd_hdac_ext_bus_get_link()
    - can: rx-offload: don't call kfree_skb() from IRQ context
    - can: dev: can_get_echo_skb(): prevent call to kfree_skb() in hard IRQ
      context
    - can: dev: __can_get_echo_skb(): fix real payload length return value for RTR
      frames
    - can: can_create_echo_skb(): fix echo skb generation: always use skb_clone()
    - can: peak_usb: add range checking in decode operations
    - can: peak_usb: peak_usb_get_ts_time(): fix timestamp wrapping
    - can: peak_canfd: pucan_handle_can_rx(): fix echo management when loopback is
      on
    - xfs: flush new eof page on truncate to avoid post-eof corruption
    - Btrfs: fix missing error return if writeback for extent buffer never started
    - ath9k_htc: Use appropriate rs_datalen type
    - usb: gadget: goku_udc: fix potential crashes in probe
    - gfs2: Free rd_bits later in gfs2_clear_rgrpd to fix use-after-free
    - gfs2: Add missing truncate_inode_pages_final for sd_aspace
    - gfs2: check for live vs. read-only file system in gfs2_fitrim
    - scsi: hpsa: Fix memory leak in hpsa_init_one()
    - drm/amdgpu: perform srbm soft reset always on SDMA resume
    - mac80211: fix use of skb payload instead of header
    - cfg80211: regulatory: Fix inconsistent format argument
    - scsi: scsi_dh_alua: Avoid crash during alua_bus_detach()
    - iommu/amd: Increase interrupt remapping table limit to 512 entries
    - pinctrl: intel: Set default bias in case no particular value given
    - ARM: 9019/1: kprobes: Avoid fortify_panic() when copying optprobe template
    - pinctrl: aspeed: Fix GPI only function problem.
    - nbd: fix a block_device refcount leak in nbd_release
    - xfs: fix flags argument to rmap lookup when converting shared file rmaps
    - xfs: fix rmap key and record comparison functions
    - xfs: fix a missing unlock on error in xfs_fs_map_blocks
    - of/address: Fix of_node memory leak in of_dma_is_coherent
    - cosa: Add missing kfree in error path of cosa_write
    - perf: Fix get_recursion_context()
    - ext4: correctly report "not supported" for {usr,grp}jquota when
      !CONFIG_QUOTA
    - ext4: unlock xattr_sem properly in ext4_inline_data_truncate()
    - thunderbolt: Add the missed ida_simple_remove() in ring_request_msix()
    - uio: Fix use-after-free in uio_unregister_device()
    - usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode
    - mei: protect mei_cl_mtu from null dereference
    - futex: Don't enable IRQs unconditionally in put_pi_state()
    - ocfs2: initialize ip_next_orphan
    - selinux: Fix error return code in sel_ib_pkey_sid_slow()
    - don't dump the threads that had been already exiting when zapped.
    - drm/gma500: Fix out-of-bounds access to struct drm_device.vblank[]
    - pinctrl: amd: use higher precision for 512 RtcClk
    - pinctrl: amd: fix incorrect way to disable debounce filter
    - swiotlb: fix "x86: Don't panic if can not alloc buffer for swiotlb"
    - IPv6: Set SIT tunnel hard_header_len to zero
    - net/af_iucv: fix null pointer dereference on shutdown
    - net/x25: Fix null-ptr-deref in x25_connect
    - vrf: Fix fast path output packet handling with async Netfilter rules
    - r8169: fix potential skb double free in an error path
    - net: Update window_clamp if SOCK_RCVBUF is set
    - random32: make prandom_u32() output unpredictable
    - x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-
      on STIBP
    - perf/core: Fix bad use of igrab()
    - perf/core: Fix crash when using HW tracing kernel filters
    - perf/core: Fix a memory leak in perf_event_parse_addr_filter()
    - Revert "kernel/reboot.c: convert simple_strtoul to kstrtoint"
    - reboot: fix overflow parsing reboot cpu number
    - Convert trailing spaces and periods in path components
    - xfs: fix scrub flagging rtinherit even if there is no rt device
    - drm/amd/pm: perform SMC reset on suspend/hibernation
    - drm/amd/pm: do not use ixFEATURE_STATUS for checking smc running
    - s390/smp: move rcu_cpu_starting() earlier
    - tpm_tis: Disable interrupts on ThinkPad T490s
    - tick/common: Touch watchdog in tick_unfreeze() on all CPUs
    - mfd: sprd: Add wakeup capability for PMIC IRQ
    - btrfs: ref-verify: fix memory leak in btrfs_ref_tree_mod
    - thunderbolt: Fix memory leak if ida_simple_get() fails in
      enumerate_services()
    - btrfs: fix potential overflow in cluster_pages_for_defrag on 32bit arch
    - mmc: renesas_sdhi_core: Add missing tmio_mmc_host_free() at remove

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Mon, 18 Jan
2021 18:20:48 +0100

** Changed in: linux (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-27777

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https://bugs.launchpad.net/bugs/1872401

Title:
  vmx_nm_test in ubuntu_kvm_unit_tests interrupted on X-oracle-4.15 /
  B-oracle-4.15 / X-KVM / B-KVM

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  New
Status in linux source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  When running kvm-unit-tests under a guest, it will be paused, requiring a
  reset. When running the same test on a host (vmx_nm_test), it will fail.

  [Test case]
  Grab kvm-unit-tests, build it and run:

  TESTNAME=vmx TIMEOUT=90s ACCEL= ./x86/run x86/vmx.flat -smp 1 -cpu
  host,+vmx -append "vmx_nm_test"

  If done inside a guest, when the host runs the bionic 4.15 kernel, the guest
  will pause.

  [Potential regressions]
  Nested KVM could stop working. Floating point could stop working on KVM
  guests, though the code that relied on this was already removed from
  Bionic.

  
  ------------------------------

  
  This issue was first spotted on Mar.16 [1]

  The ubuntu_kvm_unit_tests will be interrupted on X-oracle-4.15 on both
  VM.Standard2.1 and VM.Standard2.16, this is not a regression since it
  can be reproduced with 4.15.0-1031-oracle #34~16.04.1:

  Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/vmx_nm_test'
   BUILD_HEAD=4671e4ba
   timeout -k 1s --foreground 30 /usr/bin/qemu-system-x86_64 -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.da3iFrsCzC -smp 1 -cpu host,+vmx -append vmx_nm_test # -initrd /tmp/tmp.h2DFw8L0AF
   enabling apic
   paging enabled
   cr0 = 80010011
   cr3 = 477000
   cr4 = 20

   Test suite: vmx_nm_test
  client_loop: send disconnect: Broken pipe
  (node disconnected here)

  Before the test started, this can be found in syslog:
  Apr 13 06:26:25 selfprovisioned-phlin-kvm-unit kernel: [ 1073.529005] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.

  After that, noting was printed and node disconnected.

  If you try to run this case manually, it will stop at:
  # ./vmx_nm_test
  BUILD_HEAD=4671e4ba
  ready!!!
  timeout -k 1s --foreground 30 /usr/bin/qemu-system-x86_64 -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.ZcGrnXu6se -smp 1 -cpu host,+vmx -append vmx_nm_test # -initrd /tmp/tmp.ADjEOAcRKM
  enabling ap
  (stopped here, even the "enabling apic" string was not printed)

  It looks like this is a new test case added since the cycle of
  4.15.0-1037.41~16.04.1-oracle

  [1] https://bugs.launchpad.net/ubuntu-kernel-
  tests/+bug/1867623/comments/2

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.15.0-1031-oracle 4.15.0-1031.34~16.04.1
  ProcVersionSignature: User Name 4.15.0-1031.34~16.04.1-oracle 4.15.18
  Uname: Linux 4.15.0-1031-oracle x86_64
  ApportVersion: 2.20.1-0ubuntu2.21
  Architecture: amd64
  Date: Mon Apr 13 05:18:03 2020
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-signed-oracle
  UpgradeStatus: No upgrade log present (probably fresh install)

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