Patch submission: https://lists.ubuntu.com/archives/kernel-
team/2022-January/127030.html

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https://bugs.launchpad.net/bugs/1956793

Title:
  linux-azure-cvm: Avoid leaking guest memory when communicating with
  the host

Status in linux-azure-cvm package in Ubuntu:
  New
Status in linux-azure-cvm source package in Focal:
  In Progress

Bug description:
  [Impact]

  Initialize memory of request offers message to be sent to the host so
  padding or uninitialized fields do not leak guest memory contents.

  Patch:

  
https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/commit/?h=hyperv-
  next

  [Test case]

  Testing the information leakage to the host is not viable, but since
  the patch the vmbus layer that affects all the hyper-v drivers, a boot
  test on Hyper-V and on Azure should be enough to validate the patch,
  considering how small the change is.

  [Potential regression]

  The change is very restricted, but on an eventual regression it might
  affect any of the hyperv guest drivers.

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