[Bug 1707172] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for gnutls28 has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1707172

Title:
  AES256-GCM emits all-zeros ciphertext on aarch64 with hardware
  acceleration

Status in gnutls28 package in Ubuntu:
  Fix Released
Status in gnutls28 source package in Zesty:
  Fix Released

Bug description:
  [Impact]
  AES256-GCM ciphertext is all zero on arm64 with hardware acceleration, breaking gnome-terminal and xfce4-terminal which use encrypted scrollback buffers.

  [Test case]
  Compile the program from https://gitlab.com/gnutls/gnutls/issues/204 and make sure the cipher text is not all zeros when running it on an aarch64 machine w/ HW accel.

  [Regression potential]
  Code change is limited to AES256-GCM w/ HW accel on aarch64, so that's the only thing that could possibly break. But given that it's broken already, it does not seem to be a big issue even if it breaks otherwise.

  [Other info]
  Original report:

  The following Debian issue exists in the Ubuntu package as well

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=867581

  It breaks gnome-terminal and xfce4-terminal on arm64 machines.

  The issue is fixed upstream in 3.5.13, and the fix was backported to
  Debian stretch as well (3.5.8-5+deb9u2)

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