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[Launchpad Bug Tracker <1499089@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-24.43

---------------
linux (4.4.0-24.43) xenial; urgency=low

  [ Kamal Mostafa ]

  * CVE-2016-1583 (LP: #1588871)
    - ecryptfs: fix handling of directory opening
    - SAUCE: proc: prevent stacking filesystems on top
    - SAUCE: ecryptfs: forbid opening files without mmap handler
    - SAUCE: sched: panic on corrupted stack end

  * arm64: statically link rtc-efi (LP: #1583738)
    - [Config] Link rtc-efi statically on arm64

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Fri, 03 Jun 2016 10:02:16 -0700

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1583

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https://bugs.launchpad.net/bugs/1499089

Title:
  Please enable kconfig X86_LEGACY_VM86 for i386

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  In order for dosemu to reach maximum performance (a > 10x speedup) please enable kconfig X86_LEGACY_VM86 in the kernel. As of this commit http://www.spinics.net/lists/linux-tip-commits/msg30360.html
  the overzealous kconfig message that seemed to suggest that the vm86() syscall was a security hazard in itself has been revised to reflect reality. Also please note that even if this kconfig option is enabled the runtime default is still off as vm86 is only actually enabled if the sysctl vm.mmap_min_addr is set to 0. That said, allowing  vm.mmap_min_addr=0  is a known security risk and enabling the vm86() syscall to operate additionally would add little value to any potential attacker.

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