Public bug reported:

The CONFIG_FANOTIFY_ACCESS_PERMISSIONS option is required for certain
security products, like Microsoft Defender for Endpoints, to operate
correctly. As far as I can tell, it causes no overhead (when not
actively using it), in terms of code size or startup time.

It is currently disabled in the Focal Fossa -kvm kernel:

$ grep CONFIG_FANOTIFY /boot/config-5.4.0-1032-kvm 
CONFIG_FANOTIFY=y
# CONFIG_FANOTIFY_ACCESS_PERMISSIONS is not set

While it is enabled in the -generic kernel:

$ grep CONFIG_FANOTIFY /boot/config-5.4.0-65-generic 
CONFIG_FANOTIFY=y
CONFIG_FANOTIFY_ACCESS_PERMISSIONS=y

The same goes for Bionic Beaver.

** Affects: linux-kvm (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1915688

Title:
  Please enable CONFIG_FANOTIFY_ACCESS_PERMISSIONS

Status in linux-kvm package in Ubuntu:
  New

Bug description:
  The CONFIG_FANOTIFY_ACCESS_PERMISSIONS option is required for certain
  security products, like Microsoft Defender for Endpoints, to operate
  correctly. As far as I can tell, it causes no overhead (when not
  actively using it), in terms of code size or startup time.

  It is currently disabled in the Focal Fossa -kvm kernel:

  $ grep CONFIG_FANOTIFY /boot/config-5.4.0-1032-kvm 
  CONFIG_FANOTIFY=y
  # CONFIG_FANOTIFY_ACCESS_PERMISSIONS is not set

  While it is enabled in the -generic kernel:

  $ grep CONFIG_FANOTIFY /boot/config-5.4.0-65-generic 
  CONFIG_FANOTIFY=y
  CONFIG_FANOTIFY_ACCESS_PERMISSIONS=y

  The same goes for Bionic Beaver.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-kvm/+bug/1915688/+subscriptions

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