Ubuntu
zfs-linux package

  1. Bug #2044657
  2. Comment #19

Comment 19 for bug 2044657

Revision history for this message
Mike Ferreira (mafoelffen) wrote (last edit ): Re: zfs block cloning file system corruption

This is my merge fo a Bug Report marked as a duplicate of this one: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/2044969

In the OpenZFS patch thread, they had said that feature@block_cloning, because of the underlying bug, OpenZFS had said they turned that feature off by default in 2.2.1. (They actually didn't.)

2.2.1 is in Noble Proposed. Rick S. and I have been testing it (in DEV Noble) ever since I reported my Bug Report which recently has been marked as a duplicate of this Bug... (Noted above)

In my tests, in version 2.2.1, that package does not turn off that feature by default. Noble (with zfsutils 2.2.1) creates the rpool with feature@block_cloning=Active, as a default. I debugged the install activity for noble during the ZFS install, and it is passing features=defaults... That is not something that was injected i the code of ubuntu-desktop-installer, so it still set as a default.

Just to test that, I confirmed it. If you create a new pool by defaults, that feature gets set to enabled, unless you explicitly give it: -o feature@block_cloning=disabled

My previous proposal was for 2.2.1 to get pushed out of Noble Proposed to Noble Main. But that was before we found out that was was said about 2.2.1 was wrong. Now my proposal is to build 2.2.2, move it to Noble proposed, so Rick S. and I can test and verify it... The move it to Noble Main.

Those go along with backporting the patch back through Focal. Yes that feature@block_cloning uncovered the Bug, and increases the likelihood that it occurs, but... The underlying bug in the code goes back to code from 2012. Focal is still in support.

Ubuntu Pro ESM is another matter, which 14.04 is still in ESM, and still has 4 months left... But is also affected by this Bug/CVE.

We had also started a thread on this in the Noble Dev section: https://ubuntuforums.org/showthread.php?t=2492927&p=14167819

OpenZFS did release zfs-linux 2.2.2 last week. But I do not see any zfs-linux builds yet of that there.

Yes we know if only happens during a cp (does nto affect rsync), but the OpenZFs patches seem to work on the ZFS end of things...

This summarizes what we had there in that bug report, into this one...