[Bug 1753572] Re: cpio in Busybox 1.27 ingnores "unsafe links"

[Steve Langasek]

Hello Bryan, or anyone else affected,

Accepted busybox into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/busybox/1:1.27.2-2ubuntu3.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: busybox (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, 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:
  Fix Released
Status in debirf package in Ubuntu:
  Confirmed
Status in busybox source package in Bionic:
  Fix Committed
Status in debirf source package in Bionic:
  Confirmed
Status in busybox source package in Cosmic:
  Fix Released
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