This bug was fixed in the package linux-azure-5.8 -
5.8.0-1042.45~20.04.1

---------------
linux-azure-5.8 (5.8.0-1042.45~20.04.1) focal; urgency=medium

  * focal/linux-azure-5.8: 5.8.0-1042.45~20.04.1 -proposed tracker
    (LP: #1942558)

  * binderfs support is not enabled  (LP: #1925246)
    - [Config] linux-azure: CONFIG_ANDROID_BINDERFS=m

 -- Marcelo Henrique Cerri <marcelo.ce...@canonical.com>  Wed, 15 Sep
2021 10:49:44 -0300

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https://bugs.launchpad.net/bugs/1925246

Title:
  binderfs support is not enabled

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure-5.8 package in Ubuntu:
  Invalid
Status in linux-azure source package in Focal:
  Fix Released
Status in linux-azure-5.8 source package in Focal:
  Fix Released
Status in linux-azure source package in Hirsute:
  Fix Committed
Status in linux-azure-5.8 source package in Hirsute:
  Invalid
Status in linux-azure source package in Impish:
  Fix Released
Status in linux-azure-5.8 source package in Impish:
  Invalid

Bug description:
  [Impact]

  Hey,

  in https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1914568
  we got binder support enabled but the configuration is completely
  different from what we have in our other cloud and generic kernels:

  ubuntu@machine-1:~$ cat /boot/config-5.4.0-1046-azure | grep BINDER
  CONFIG_ANDROID_BINDER_IPC=m
  # CONFIG_ANDROID_BINDERFS is not set
  CONFIG_ANDROID_BINDER_DEVICES="binder,hwbinder,vndbinder"
  # CONFIG_ANDROID_BINDER_IPC_SELFTEST is not set

  $ cat /boot/config-5.4.0-14-generic | grep BINDER
  CONFIG_ANDROID_BINDER_IPC=m
  CONFIG_ANDROID_BINDERFS=m
  CONFIG_ANDROID_BINDER_DEVICES=""
  # CONFIG_ANDROID_BINDER_IPC_SELFTEST is not set

  Not having binderfs support is breaking Anbox Cloud support. What is
  the reason for not having the config aligned between the kernels here?

  Thanks!

  
  [Test Plan]

  After installing the extra modules package, binderfs should be
  available via mount.

  [Where problems could occur]

  It could cause issues to any existing users of the existing
  binder_linux module. However this module is currently shipped as extra
  and should not affect regular users.

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