Ubuntu
zfs-linux package

zfs-dkms UBSAN array-out-of-bounds warning with kernel 6.5 on mantic

Bug #2033385 reported by Andrea Righi
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
zfs-linux (Ubuntu)
Fix Released
Undecided
Steve Langasek
Mantic
Fix Released
Undecided
Steve Langasek

Bug Description

[Impact]

When the zfs module is loaded we can see the following errors in dmesg with the latest 6.5 kernel in mantic:

[ 10.730318] UBSAN: array-index-out-of-bounds in /build/mantic/debian/build/build-generic/_______________________________________________________________________________________________dkms/build/zfs/2.2.0~rc3/build/module/zfs/vdev_raidz_math_impl.h:1475:22
[ 10.734075] index 6 is out of range for type 'raidz_col_t [*]'

[Test case]

 $ sudo apt install zfs-dkms

[Fix]

Apply this patch to properly support varlen arrays and prevent the UBSAN warnings:

 https://github.com/ckane/zfs/commit/095a435cd5129b25ebc1b090613b73059719bae5

[Regression potential]

This change is limited to ZFS, so we may experience regressions in those systems that are using ZFS filesystems or zpool volumes.

Tags: patch
Revision history for this message
Andrea Righi (arighi) wrote :

debdiff in attach fixes the UBSAN warnings with linux 6.5 on mantic.

Revision history for this message
Andrea Righi (arighi) wrote :

Add LP bug reference to the changelog.

Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

The attachment "zfs-fix-ubsan-warnings.debdiff" seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]

tags: added: patch
Revision history for this message
Steve Langasek (vorlon) wrote :

looks good, thank you

Changed in zfs-linux (Ubuntu Mantic):
status: New → Fix Committed
assignee: nobody → Steve Langasek (vorlon)
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package zfs-linux - 2.2.0~rc3-0ubuntu2

---------------
zfs-linux (2.2.0~rc3-0ubuntu2) mantic; urgency=medium

  * Fix UBSAN array-index-out-of-bounds warnings (LP: #2033385):
    - debian/patches/4630-ubsan-Support-varlen-arrays-at-end-of-struct-as-1-or.patch

 -- Andrea Righi <email address hidden> Tue, 29 Aug 2023 09:37:56 +0000

Changed in zfs-linux (Ubuntu Mantic):
status: Fix Committed → Fix Released
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