[Bug 1931474] [NEW] Backslash characters in password for encrypted ZFS installs are ignored

[Alex]

Public bug reported:

Sometime around when ZFS was introduced to the installer, when trying to
use that option along with an encrypted install, everything would work
until first boot. After that it would claim that the password was
incorrect, and I was unable to find a reason why.

Doing a reinstall with the new 21.04 I tried the ZFS encrypted install
again to see if it would work. I got the same error and happened to
trace it down to the backslash character in my password.  I tried to
escape the backslash with another but that did not work. Finally, when
typing the password on boot without the backslash it would work.

I have not had the same problem when choosing to install with LVM
instead.

The same issue arises when trying to unlock the drive using cryptsetup
on the emergency console. I have attached the output when trying to use
the password I want and the password that works with the --debug option.

I am using a Dell XPS 13 9100.

1) 
Description:	Ubuntu 21.04
Release:	21.04

2) 
ubiquity:
  Installed: 21.04.19
  Candidate: 21.04.19
  Version table:
 *** 21.04.19 500
        500 http://archive.ubuntu.com/ubuntu hirsute/main
        100 /var/lib/dpkg/status

3) Be able to set a password with a backslash and have the backslash be
in the password when using it to open the drive.

4) The backslash is dropped from the password and the password will not
work with it when trying to open the drive.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "IMG-1901.jpg"
   https://bugs.launchpad.net/bugs/1931474/+attachment/5503615/+files/IMG-1901.jpg

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https://bugs.launchpad.net/bugs/1931474

Title:
  Backslash characters in password for encrypted ZFS installs are
  ignored

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Sometime around when ZFS was introduced to the installer, when trying
  to use that option along with an encrypted install, everything would
  work until first boot. After that it would claim that the password was
  incorrect, and I was unable to find a reason why.

  Doing a reinstall with the new 21.04 I tried the ZFS encrypted install
  again to see if it would work. I got the same error and happened to
  trace it down to the backslash character in my password.  I tried to
  escape the backslash with another but that did not work. Finally, when
  typing the password on boot without the backslash it would work.

  I have not had the same problem when choosing to install with LVM
  instead.

  The same issue arises when trying to unlock the drive using cryptsetup
  on the emergency console. I have attached the output when trying to
  use the password I want and the password that works with the --debug
  option.

  I am using a Dell XPS 13 9100.

  1) 
  Description:	Ubuntu 21.04
  Release:	21.04

  2) 
  ubiquity:
    Installed: 21.04.19
    Candidate: 21.04.19
    Version table:
   *** 21.04.19 500
          500 http://archive.ubuntu.com/ubuntu hirsute/main
          100 /var/lib/dpkg/status

  3) Be able to set a password with a backslash and have the backslash
  be in the password when using it to open the drive.

  4) The backslash is dropped from the password and the password will
  not work with it when trying to open the drive.

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