[Bug 1884079] [NEW] unmkinitramfs in initramfs-tools-core doesn't fully extract an initrd in bionic

[Hari Sundararajan]

Public bug reported:

I am running Ubuntu 18.04.4

I am looking at the initrd found in the desktop live cd (<cd loop
mount>/casper/initrd). If you execute `binwalk initrd`, binwalk informs
that the initrd file contains 2 cpio archives and a lzma archive

The first cpio archive is supposed to contain kernel/x86/microcode/AuthenticAMD.bin
The second cpio archive is supposed to contain kernel/x86/microcode/GenuineIntel.bin
The third file is a LZMA compressed data

Now, if you execute `unmkinitramfs <cd loop mount>/casper/initrd new-
directory` , you will see 2 directories, "early" and "main".

"early" has the AuthenticAMD.bin, which means it corresponds to the first cpio. 
"main" is the actual initial ram disk file system, which comes from the LZMA compressed data. 

What I expect to see is also the GenuineIntel.bin firmware. `binwalk`
says it's there, but `unmkinitramfs` is not able to extract it out. Why?

I see binwalk is at version 2.1.1-16, while initramfs-tools-core (which
provides unmkinitramfs) is at version 0.130ubuntu3.9.

How do I extract the ubuntu 18 initramfs and get all the contents that
binwalk is able to see?

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: initrd

** Summary changed:

- unmkinitramfs in initramfs-tools-core doesn't fully extract an initrd
+ unmkinitramfs in initramfs-tools-core doesn't fully extract an initrd in bionic

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https://bugs.launchpad.net/bugs/1884079

Title:
  unmkinitramfs in initramfs-tools-core doesn't fully extract an initrd
  in bionic

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  I am running Ubuntu 18.04.4

  I am looking at the initrd found in the desktop live cd (<cd loop
  mount>/casper/initrd). If you execute `binwalk initrd`, binwalk
  informs that the initrd file contains 2 cpio archives and a lzma
  archive

  The first cpio archive is supposed to contain kernel/x86/microcode/AuthenticAMD.bin
  The second cpio archive is supposed to contain kernel/x86/microcode/GenuineIntel.bin
  The third file is a LZMA compressed data

  Now, if you execute `unmkinitramfs <cd loop mount>/casper/initrd new-
  directory` , you will see 2 directories, "early" and "main".

  "early" has the AuthenticAMD.bin, which means it corresponds to the first cpio. 
  "main" is the actual initial ram disk file system, which comes from the LZMA compressed data. 

  What I expect to see is also the GenuineIntel.bin firmware. `binwalk`
  says it's there, but `unmkinitramfs` is not able to extract it out.
  Why?

  I see binwalk is at version 2.1.1-16, while initramfs-tools-core
  (which provides unmkinitramfs) is at version 0.130ubuntu3.9.

  How do I extract the ubuntu 18 initramfs and get all the contents that
  binwalk is able to see?

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