[Bug 1983359] Re: hwrng drivers missing in initrd.img

[Steve Langasek]

This needs the bug description completed according to
https://wiki.ubuntu.com/StableReleaseUpdates#SRU_Bug_Template ("Where
problems could occur") before it can be sponsored.

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https://bugs.launchpad.net/bugs/1983359

Title:
  hwrng drivers missing in initrd.img

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Jammy:
  Incomplete
Status in initramfs-tools source package in Kinetic:
  Fix Released

Bug description:
  [Impact]
  The initialization of the entropy buffer of the urandom device is critical for security.

  [Test case]
  When booting Jammy 22.04.1 on QEMU riscv64 I see the following warnings:

  [   14.654546] random: lvm: uninitialized urandom read (4 bytes read)
  [   15.247995] random: lvm: uninitialized urandom read (2 bytes read)
  [   22.484719] random: lvm: uninitialized urandom read (4 bytes read)
  [   43.161846] random: lvmconfig: uninitialized urandom read (4 bytes read)
  [   48.862281] random: lvm: uninitialized urandom read (4 bytes read)

  Module virtio-rng.ko is missing in initrd.img.
  Adding virtio_rng to /etc/initramfs-tools/modules avoids the warnings.

  Hardware RNG drivers should generally be included in the initrd to
  provide early entropy.

  Best regards

  Heinrich

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