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[Launchpad Bug Tracker <1775856@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.13.0-46.51

---------------
linux (4.13.0-46.51) artful; urgency=medium

  * linux: 4.13.0-46.51 -proposed tracker (LP: #1776333)

  * register on binfmt_misc may overflow and crash the system (LP: #1775856)
    - fs/binfmt_misc.c: do not allow offset overflow

  * CVE-2018-11508
    - compat: fix 4-byte infoleak via uninitialized struct field

  * rfi-flush: Switch to new linear fallback flush (LP: #1744173)
    - SAUCE: rfi-flush: Factor out init_fallback_flush()
    - SAUCE: rfi-flush: Move rfi_flush_fallback_area to end of paca
    - powerpc/64s: Improve RFI L1-D cache flush fallback
    - powerpc/rfi-flush: Make it possible to call setup_rfi_flush() again
    - powerpc/rfi-flush: Differentiate enabled and patched flush types
    - powerpc/rfi-flush: Call setup_rfi_flush() after LPM migration

  * Fix enabling bridge MMIO windows (LP: #1771344)
    - powerpc/eeh: Fix enabling bridge MMIO windows

  * CVE-2018-1130
    - dccp: check sk for closed state in dccp_sendmsg()

  * CVE-2018-7757
    - scsi: libsas: fix memory leak in sas_smp_get_phy_events()

  * cpum_sf: ensure sample freq is non-zero (LP: #1772593)
    - s390/cpum_sf: ensure sample frequency of perf event attributes is non-zero

  * wlp3s0: failed to remove key (1, ff:ff:ff:ff:ff:ff) from hardware (-22)
    (LP: #1720930)
    - iwlwifi: mvm: fix "failed to remove key" message

  * CVE-2018-6927
    - futex: Prevent overflow by strengthen input validation

  * After update to 4.13-43 Intel Graphics are Laggy (LP: #1773520)
    - SAUCE: Revert "drm/i915/edp: Allow alternate fixed mode for eDP if
      available."

  * ELANPAD ELAN0612 does not work, patch available (LP: #1773509)
    - SAUCE: Input: elan_i2c - add ELAN0612 to the ACPI table

  * kernel backtrace when receiving large UDP packages (LP: #1772031)
    - iov_iter: fix page_copy_sane for compound pages

  * FS-Cache: Assertion failed: FS-Cache: 6 == 5 is false (LP: #1774336)
    - SAUCE: CacheFiles: fix a read_waiter/read_copier race

  * CVE-2018-5803
    - sctp: verify size of a new chunk in _sctp_make_chunk()

  * enable mic-mute hotkey and led on Lenovo M820z and M920z (LP: #1774306)
    - ALSA: hda/realtek - Enable mic-mute hotkey for several Lenovo AIOs

  * CVE-2018-7755
    - SAUCE: floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl

  * CVE-2018-5750
    - ACPI: sbshc: remove raw pointer from printk() message

 -- Khalid Elmously <khalid.elmously@xxxxxxxxxxxxx>  Mon, 11 Jun 2018
23:25:30 +0000

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-1130

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-11508

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-5750

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-5803

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-6927

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-7755

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-7757

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-12154

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-12193

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-15265

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-3665

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https://bugs.launchpad.net/bugs/1775856

Title:
  register on binfmt_misc may overflow and crash the system

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Precise:
  Incomplete
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Cosmic:
  Incomplete

Bug description:
  [Impact]
  When registering a new binfmt_misc handler, it is possible to overflow
  the offset to get a negative value, which might crash the system, or
  possibly leak kernel data.

  Here is a crash log when 2500000000 was used as an offset:

    BUG: unable to handle kernel paging request at ffff989cfd6edca0
    IP: load_misc_binary+0x22b/0x470 [binfmt_misc]
    PGD 1ef3e067 P4D 1ef3e067 PUD 0
    Oops: 0000 [#1] SMP NOPTI
    Modules linked in: binfmt_misc kvm_intel ppdev kvm irqbypass joydev input_leds serio_raw mac_hid parport_pc qemu_fw_cfg parpy
    CPU: 0 PID: 2499 Comm: bash Not tainted 4.15.0-22-generic #24-Ubuntu
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014
    RIP: 0010:load_misc_binary+0x22b/0x470 [binfmt_misc]
    Call Trace:
      search_binary_handler+0x97/0x1d0
      do_execveat_common.isra.34+0x667/0x810
      SyS_execve+0x31/0x40
      do_syscall_64+0x73/0x130
      entry_SYSCALL_64_after_hwframe+0x3d/0xa2

  Use kstrtoint instead of simple_strtoul.  It will work as the code
  already set the delimiter byte to '\0' and we only do it when the field
  is not empty.

  [Test Case]
  Tested with offsets -1, 2500000000, UINT_MAX and INT_MAX.  Also tested
  with examples documented at Documentation/admin-guide/binfmt-misc.rst
  and other registrations from packages on Ubuntu.

  [Regression]
  Fail to register valid types. This was tested with a bionic kernel with the patch.

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