[Bug 1980018] Re: Cryptsetup-initramfs cant deal with tpm2-device option

[Steve Langasek]

On Sun, Oct 29, 2023 at 11:47:41PM -0000, Grumpus wrote:
> Is there a source to support this statement?  As far as I can tell
> Ubuntu does measure the initramfs into the PCRs

What gives you that impression?  What PCR do you see being extended by GRUB
with a hash of the initramfs when loaded?

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Title:
  Cryptsetup-initramfs cant deal with tpm2-device option

Status in cryptsetup package in Ubuntu:
  Triaged

Bug description:
  In order to boot an encrypted system and autounlock with tpm2, the
  tpm2-device= option must be specified in  /etc/crypttab. This works
  for non-root filesystems for some reason, but when applied to root
  filesystems it doesnt. Tested working on both arch and fedora, so the
  method is good, something is off in the background.


  root at test:~# update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-5.15.0-40-generic
  cryptsetup: WARNING: sda3_crypt: ignoring unknown option 'tpm2-device'

  
  Manually adding it to  /lib/cryptsetup/functions produces this

  root at test:~# update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-5.15.0-40-generic
  /usr/share/initramfs-tools/hooks/cryptroot: 1: eval: CRYPTTAB_OPTION_tpm2-device=auto: not found

  
  That file belongs to cryptsetup-initramfs

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