[Bug 1506995] Re: Ubiquity uses /dev/zero when setting up encrypted swap

[Patrik Nilsson]

** Summary changed:

- Ubiquity uses /dev/null when setting up encrypted swap
+ Ubiquity uses /dev/zero when setting up encrypted swap

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https://bugs.launchpad.net/bugs/1506995

Title:
  Ubiquity uses /dev/zero when setting up encrypted swap

Status in ubiquity package in Ubuntu:
  Opinion
Status in user-setup package in Ubuntu:
  Opinion

Bug description:
  In Ubiquity's script/user-setup-encrypted-swap, the crypt partition is
  zeroed. This leaves it more vulnerable to attacks. The attacker knows
  the partition is zeroed and can more easily find the encryption key.

  The included patch solves this issue, but this can also be done in a
  faster way by using openssl.

  Patched lines:

  dd if=/dev/urandom of=$device bs=16M seek=1 2>/dev/null || true

  Alternative approch:

  openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128
  count=1 2>/dev/null | base64)" -nosalt < /dev/zero | head -c $size |
  dd of=$target

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