[Bug 2015355] Re: Please backport patches for false atari partition detection to Ubuntu 20.04

Tue Jun 6 14:36:55 UTC 2023

I have verified the fix using util-linux 2.34-0.1ubuntu9.4 from focal-
proposed:

$ qemu-img create -f qcow2 test.img 20G
Formatting 'test.img', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=21474836480 lazy_refcounts=off refcount_bits=16
$ qemu-system-x86_64 -enable-kvm -m 4096 -name test -drive file=test.img,format=qcow2 -net nic,model=virtio -net user,hostfwd=tcp::7022-:22 -vga virtio -cdrom ~/downloads/ubuntu-20.04.6-desktop-amd64.iso
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2]

Inside the VM:

ubuntu at ubuntu:~$ sudo parted -s /dev/sda -- mklabel msdos
ubuntu at ubuntu:~$ sudo parted -s /dev/sda -- mkpart primary 0% 10% mkpart primary 10% 30%
ubuntu at ubuntu:~$ sudo wipefs /dev/sda
DEVICE OFFSET TYPE  UUID LABEL
sda    0x1fe  dos        
sda    0x1d2  atari      
ubuntu at ubuntu:~$ sudo vi /etc/apt/sources.list
ubuntu at ubuntu:~$ sudo apt update
Ign:1 cdrom://Ubuntu 20.04.6 LTS _Focal Fossa_ - Release amd64 (20230316) focal InRelease
Hit:2 cdrom://Ubuntu 20.04.6 LTS _Focal Fossa_ - Release amd64 (20230316) focal Release
Hit:4 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Get:6 http://security.ubuntu.com/ubuntu focal-proposed InRelease [267 kB]
Hit:7 http://security.ubuntu.com/ubuntu focal-security InRelease
Get:8 http://security.ubuntu.com/ubuntu focal-proposed/main amd64 Packages [259 kB]
Get:9 http://security.ubuntu.com/ubuntu focal-proposed/main Translation-en [56.7 kB]
Get:10 http://security.ubuntu.com/ubuntu focal-proposed/main amd64 DEP-11 Metadata [9,384 B]
Get:11 http://security.ubuntu.com/ubuntu focal-proposed/main DEP-11 48x48 Icons [10.3 kB]
Get:12 http://security.ubuntu.com/ubuntu focal-proposed/main DEP-11 64x64 Icons [15.7 kB]
Get:13 http://security.ubuntu.com/ubuntu focal-proposed/main DEP-11 64x64 at 2 Icons [29 B]
Get:14 http://security.ubuntu.com/ubuntu focal-proposed/main amd64 c-n-f Metadata [2,684 B]
Get:15 http://security.ubuntu.com/ubuntu focal-proposed/restricted amd64 Packages [298 kB]
Get:16 http://security.ubuntu.com/ubuntu focal-proposed/restricted Translation-en [43.5 kB]
Get:17 http://security.ubuntu.com/ubuntu focal-proposed/restricted amd64 c-n-f Metadata [316 B]
Fetched 963 kB in 2s (576 kB/s)                          
Reading package lists... Done
Building dependency tree       
Reading state information... Done
267 packages can be upgraded. Run 'apt list --upgradable' to see them.
ubuntu at ubuntu:~$ sudo apt install libblkid1
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be upgraded:
  libblkid1
1 upgraded, 0 newly installed, 0 to remove and 266 not upgraded.
Need to get 137 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://security.ubuntu.com/ubuntu focal-proposed/main amd64 libblkid1 amd64 2.34-0.1ubuntu9.4 [137 kB]
Fetched 137 kB in 1s (179 kB/s)
(Reading database ... 188675 files and directories currently installed.)
Preparing to unpack .../libblkid1_2.34-0.1ubuntu9.4_amd64.deb ...
Unpacking libblkid1:amd64 (2.34-0.1ubuntu9.4) over (2.34-0.1ubuntu9.3) ...
Setting up libblkid1:amd64 (2.34-0.1ubuntu9.4) ...
Processing triggers for libc-bin (2.31-0ubuntu9.9) ...
ubuntu at ubuntu:~$ apt-cache policy libblkid1
libblkid1:
  Installed: 2.34-0.1ubuntu9.4
  Candidate: 2.34-0.1ubuntu9.4
  Version table:
 *** 2.34-0.1ubuntu9.4 500
        500 http://security.ubuntu.com/ubuntu focal-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     2.34-0.1ubuntu9.3 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
     2.34-0.1ubuntu9 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
ubuntu at ubuntu:~$ sudo wipefs /dev/sda
DEVICE OFFSET TYPE UUID LABEL
sda    0x1fe  dos

** Tags added: verification-done-focal

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https://bugs.launchpad.net/bugs/2015355

Title:
  Please backport patches for false atari partition detection to Ubuntu
  20.04

Status in util-linux package in Ubuntu:
  Fix Released
Status in util-linux source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  The partition detection logic in libblkid1 can falsely report the
  presence of an atari partition. One place where this has a practical
  impact is in kubernetes where mount-utils will refuse to format the
  device (https://github.com/kubernetes/mount-
  utils/blob/732a08ae47571516020ef99c303c70c1fa5b3e6c/mount_linux.go#L437-L441).

  [Test Plan]

  * Create a new qcow2 disk image:

  $ qemu-img create -f qcow2 test.img 20G

  * Boot a focal ISO with QEMU/KVM as if installing to test.img:

  $ qemu-system-x86_64 -enable-kvm -m 4096 -name test -drive
  file=test.img,format=qcow2 -net nic,model=virtio -net
  user,hostfwd=tcp::1022-:22 -vga virtio -cdrom ubuntu-20.04.6-desktop-
  amd64.iso

  * Using the live environment, format the empty disk. These particular
  commands were given as a reproducer on the upstream bug report
  (https://github.com/util-linux/util-linux/issues/1116).

  $ parted -s /dev/sda -- mklabel msdos
  $ parted -s /dev/sda -- mkpart primary 0% 10% mkpart primary 10% 30%

  * Run wipefs on /dev/sda to list partitions. On an affected machine,
  an atari partition will be listed. On a fixed machine, the incorrect
  atari listing will be gone.

  $ wipefs /dev/sda
  DEVICE OFFSET TYPE  UUID LABEL
  sda    0x1fe  dos
  sda    0x1d2  atari

  [Where problems could occur]

  These patches specifically address the atari prober logic in libblkid.
  Therefore, if we saw regressions it would be related to detecting
  atari partitions with libblkid. This would potentially impact tools
  such as wipefs and blkid, or any other tool that uses libblkid1 for
  this purpose.

  [Original Description]

  There are three patches in util-linux upstream that were released in
  util-linux 2.37 and prevent false detection of the atari partition
  table with blkid and wipefs. We see this mostly on LUKS devices
  initialised via luksFormat reporting there is an atari partition table
  on the device when it is empty. This causes issues in various places,
  but one key example for us is in kubernetes where mount-utils will
  refuse to format the device (https://github.com/kubernetes/mount-
  utils/blob/732a08ae47571516020ef99c303c70c1fa5b3e6c/mount_linux.go#L437-L441)

  RedHat backported these fixes to RHEL 8 under
  https://bugzilla.redhat.com/show_bug.cgi?id=2060030 and it would be
  helpful if Ubuntu also backported them to Ubuntu 20.04 which is still
  running util-linux 2.34

  The request is to backport patches based on the
  https://github.com/util-linux/util-linux/issues/1159 upstream report.

  Upstream commits to cherry-pick the changes to libblkid/src/partitions/atari.c from:
  2cc76d50d7a14bef8e7b07fab11b26c9e49d36a2
  282ceadc3a72fc07dd0388b8880fd751490bb87f
  c70b4f2a5b99876d230b8f4f413c3bb3ee6647f1

  # lsb_release -a
  Distributor ID: Ubuntu
  Description:    Ubuntu 20.04.6 LTS
  Release:        20.04
  Codename:       focal
  # blkid -V
  blkid from util-linux 2.34  (libblkid 2.34.0, 14-Jun-2019)
  # blkid -p -s TYPE -s PTTYPE -o export /dev/mapper/pvc-7b331195-cd5a-4ab6-8fdc-552af4b9139d_encrypted
  DEVNAME=dev/mapper/pvc-7b331195-cd5a-4ab6-8fdc-552af4b9139d_encrypted
  PTTYPE=atari
  # lsblk
  ...
  sdc                                                    crypto_LUKS                 a79d2982-74f2-44c7-bb29-460768ebfe64
  `-3600a09803830474a735d4c63744c4a56                    crypto_LUKS                 a79d2982-74f2-44c7-bb29-460768ebfe64
    `-pvc-7b331195-cd5a-4ab6-8fdc-552af4b9139d_encrypted

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