Bug 795206 - parted should create GPT Linux filesystem partitions with Linux-specific GUID type code
parted should create GPT Linux filesystem partitions with Linux-specific GUID...
Product: Fedora
Classification: Fedora
Component: parted (Show other bugs)
All Linux
unspecified Severity medium
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Assigned To: Brian Lane
Fedora Extras Quality Assurance
Depends On:
Blocks: 1021263
  Show dependency treegraph
Reported: 2012-02-19 20:25 EST by Rod Smith
Modified: 2013-10-20 16:40 EDT (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
: 1021263 (view as bug list)
Last Closed: 2013-02-13 04:00:50 EST
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Regression: ---
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Documentation: ---
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Screen shot of Windows, showing how easily it can destroy a Linux installation. (53.73 KB, image/png)
2012-02-19 20:25 EST, Rod Smith
no flags Details
This is the patch to fix the problem (against parted 3.0) (91.68 KB, patch)
2012-02-20 20:20 EST, Rod Smith
no flags Details | Diff

  None (edit)
Description Rod Smith 2012-02-19 20:25:56 EST
Created attachment 564263 [details]
Screen shot of Windows, showing how easily it can destroy a Linux installation.

Description of problem:

When creating GPT partitions for Linux filesystems, libparted uses the Microsoft Basic Data partition type code GUID (EBD0A0A2-B9E5-4433-87C0-68B6B72699C7). This is fine as far as Linux is concerned, since Linux ignores partition type codes for the most part; but the result is that the Windows file manager shows Linux filesystem partitions as being unformatted but accessible disks. Attempting to access such partitions results in a prompt to format them. (See attached screen shot.) This behavior is potentially dangerous; a simple user error can easily result in trashing the Linux installation.

Note that libparted creates partitions with appropriate Linux-specific type codes when creating swap, LVM, or Linux RAID partitions. It also creates Linux-specific type codes on MBR ("msdos") disks; it's ONLY Linux filesystems on GPT disks that are affected.

I created a patch for this problem almost eight months (see below), but the libparted developers have been slow to add it to libparted. I recommend it be added as a bug fix in Fedora.

This problem is likely to become increasingly important as UEFI-based systems become more common, since UEFI installations of Windows necessarily use GPT rather than MBR, which is more common on BIOS-based computers.

Version-Release number of selected component (if applicable):

3.0 and earlier.

How reproducible:


Steps to Reproduce:
1. Launch parted (or any other libparted-using tool, including anaconda) on a GPT disk.
2. Create a new partition with a Linux filesystem (ext#fs, ReiserFS, XFS, JFS, etc.).
Actual results:

The partition uses the Microsoft Basic Data type code.

Expected results:

The partition should use the Linux Filesystem Data type code (EBD0A0A2-B9E5-4433-87C0-68B6B72699C7)

Additional info:

I submitted a patch for this problem to the libparted developers in June of 2011, and they agreed to incorporate it into the mainstream libparted, but have yet to do so. The patch is available on the bug-parted mailing list or at http://www.rodsbooks.com/linux-fs-code/index.html.
Comment 1 Rod Smith 2012-02-20 20:20:19 EST
Created attachment 564547 [details]
This is the patch to fix the problem (against parted 3.0)
Comment 2 Chris Murphy 2012-02-29 15:36:21 EST
Is this a duplicate of Bug 746895? I think it should be a separate bug for RHEL 6 however, which uses parted 2.1 and has this same problem.
Comment 3 Chris Murphy 2012-02-29 15:41:19 EST
Oops, sorry, that's a negative, disregard comment#2. 

This bug is Linux file system having the Windows Basic Data GUID. Bug 746895 is /boot being given the parted 'boot' flag which causes it to have the EFI System GUID.
Comment 4 Chris Murphy 2012-03-13 03:34:36 EDT
Still a bug in Fedora-17-Nightly-20120307.09-x86_64-Live-kde.iso. Version should be changed from 16 to 17.
Comment 5 Brian Lane 2012-03-13 13:53:05 EDT
Thanks for the report, but is isn't expected to be any different. I'm not going to change this in parted until upstream adopts it.
Comment 6 Chris Murphy 2012-03-13 22:19:16 EDT
Arguably they've already adopted it, in that they've agreed there needs to be a unique GUID and the two relevant teams have agreed on what that GUID should be. parted upstream just haven't incorporated the patch.

It's been 9 months since upstream's suggested patch modifications were made, and still no incorporation. In the meantime, partitions are assigned arguably bogus GUIDs, with a known and reproducible user gotcha.

Once upstream applies the patch, is this something that will be back ported to RHEL6's parted 2.1?
Comment 7 Fedora End Of Life 2013-01-16 05:22:18 EST
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