Hi! I've prepared a busybox update and uploaded it to my PPA here:

https://launchpad.net/~mdeslaur/+archive/ubuntu/testing

Could you please see if it resolves your issue? If so, I'll upload it to
cosmic and SRU it to bionic.

Thanks!

** Also affects: busybox (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: debirf (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: busybox (Ubuntu Cosmic)
   Importance: Undecided
       Status: Confirmed

** Also affects: debirf (Ubuntu Cosmic)
   Importance: Undecided
       Status: Confirmed

** Changed in: busybox (Ubuntu Bionic)
       Status: New => Confirmed

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to busybox in Ubuntu.
https://bugs.launchpad.net/bugs/1753572

Title:
  cpio in Busybox 1.27 ingnores "unsafe links"

Status in busybox package in Ubuntu:
  Confirmed
Status in debirf package in Ubuntu:
  Confirmed
Status in busybox source package in Bionic:
  Confirmed
Status in debirf source package in Bionic:
  New
Status in busybox source package in Cosmic:
  Confirmed
Status in debirf source package in Cosmic:
  Confirmed

Bug description:
  Description:    Ubuntu Bionic Beaver (development branch)
  Release:        18.04

  busybox:
    Installed: 1:1.27.2-2ubuntu3
    Candidate: 1:1.27.2-2ubuntu3

  3) Expected my CPIO archive to be fully extracted with proper symlinks
  Command: unxz < /rootfs.cxz | cpio -i

  4) 'Unsafe' symlinks were ignored such as:

  sbin/init -> /lib/systemd/systemd

  With the broken 1.27 sbin/init does not get created at all and my
  debirf initrd fails to load/boot properly.

  1.22 from Xenial works.
  GNU Cpio also works.

  It looks like 1.28 adds an env var to override this behavior:

  libarchive: do not extract unsafe symlinks unless
  $EXTRACT_UNSAFE_SYMLINKS=1

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/busybox/+bug/1753572/+subscriptions

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