SRU: fix FAT recognition after resizing

Bug #1820090 reported by Alkis Georgopoulos on 2019-03-14
This bug affects 3 people
Affects Status Importance Assigned to Milestone
parted (Ubuntu)

Bug Description

After resizing a FAT partition with any tool that uses libparted (parted, gparted) in Bionic, the file system is no longer recognizable by Microsoft Windows.

This fix has been applied in Cosmic+.
The Debian bug report is:
The patch applied upstream is:

[Test case]
 * Use e.g. gparted to format a USB stick with MBR and a fat32 partition.
 * Verify that it's readable by Windows.
 * Check for correct output similar to this:
# file -s /dev/sdf1
/dev/sdf1: DOS/MBR boot sector, code offset 0x58+2, OEM-ID "mkfs.fat", sectors/cluster 16,
Media descriptor 0xf8, sectors/track 32, heads 64, hidden sectors 2048, sectors 30447616
(volumes > 32 MB), FAT (32 bit), sectors/FAT 14864, serial number 0x7a03dea6, label: "ASDF "
 * Resize it to e.g. 1 MB less.
 * Verify that it's no longer readable by Windows.
 * Check for wrong output similar to this:
# file -s /dev/sdf1
/dev/sdf1: DOS/MBR boot sector

[Regression Potential]
Minimal, the patch is an upstream one and already tested in Debian, in the Gparted live CD, and in newer Ubuntu releases.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in parted (Ubuntu):
status: New → Confirmed
Thomas Ward (teward) on 2019-03-14
Changed in parted (Ubuntu):
importance: Undecided → High
importance: High → Medium
assignee: nobody → Thomas Ward (teward)
importance: Medium → High
Thomas Ward (teward) wrote :


Attached is a debdiff containing a patch with the specified upstream commit included, for Bionic.

Simon Quigley (tsimonq2) wrote :

Sponsored, it is now in Bionic UNAPPROVED.

Sebastien Bacher (seb128) wrote :

Closing for the current release since that's fixed there, a bionic line is going to be added once the SRU is reviewed/approved

Changed in parted (Ubuntu):
status: Confirmed → In Progress
status: In Progress → Fix Released
Thomas Ward (teward) on 2019-03-18
tags: added: bionic
Thomas Ward (teward) on 2019-03-18
Changed in parted (Ubuntu):
assignee: Thomas Ward (teward) → nobody

Hello Alkis, or anyone else affected,

Accepted parted into bionic-proposed. The package will build now and be available at in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See 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 . 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 parted (Ubuntu Bionic):
status: New → Fix Committed
tags: added: verification-needed verification-needed-bionic
Alkis Georgopoulos (alkisg) wrote :

Hi, I verify that the proposed packages work as expected in bionic.
I created a 300 MB fat32 image, resized it with the updated packages, and it was still readable by "file -s /dev/loop5p1" and by MS Windows.

# dpkg -l '*parted*' | grep ^ii
ii gparted 0.30.0-3ubuntu2 amd64 GNOME partition editor
ii libparted-fs-resize0:amd64 3.2-20ubuntu0.2 amd64 disk partition manipulator - shared FS resizing library
ii libparted2:amd64 3.2-20ubuntu0.2 amd64 disk partition manipulator - shared library
ii parted 3.2-20ubuntu0.2 amd64 disk partition manipulator

tags: added: verification-done-bionic
removed: bionic verification-needed verification-needed-bionic
Thomas Ward (teward) on 2019-03-20
tags: added: verification-done
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package parted - 3.2-20ubuntu0.2

parted (3.2-20ubuntu0.2) bionic; urgency=medium

  * debian/patches/fix-windows-fat-recognition-after-resizing.patch:
    Apply upstream patch to fix FAT resizing so that FAT filesystems which
    are resized by libparted are recognizeable in Microsoft Windows.
    (LP: #1820090)

 -- Thomas Ward <email address hidden> Thu, 14 Mar 2019 13:05:58 -0400

Changed in parted (Ubuntu Bionic):
status: Fix Committed → Fix Released

The verification of the Stable Release Update for parted has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

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