grub-probe: double free or corruption in some rare cases

Bug #1330963 reported by Vladimir Smirnov
This bug affects 10 people
Affects Status Importance Assigned to Milestone
grub2 (Ubuntu)

Bug Description

There is small bug in grub2 in trusty, that causing grub-probe to fail in some rare cases.
I've got system with follwing scheme:
GPT (4 HDD):
1) 128MB Free space, bios_boot flag
2) MDADM RAID10, /boot, ext3
3) MDADM RAID10, LVM vg0 (for /, /home, etc)
4) MDADM RAID10, LVM vg1 (data partitions).

In this case grub fails with:
glibc detected *** ./grub-probe: double free or corruption (fasttop): 0x0000000000838760 ***

Cause of this behavior is grub-core/disk/diskfilter.c:886.

I've also filed a bug upstream:
but it's still not closed and bug is present in Ubuntu 14.04.

I'm attaching my vision of fixing this bug here. Thoguh, there maybe a better way to fix this.

Related branches

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

The attachment "0001-Fix-double-free-when-using-LVM.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

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

tags: added: patch
Revision history for this message
Launchpad Janitor (janitor) wrote :

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

Changed in grub2 (Ubuntu):
status: New → Confirmed
Changed in grub2 (Ubuntu):
importance: Undecided → High
tags: added: trusty
tags: added: rls-u-incoming
Revision history for this message
Toni Förster (stonerl) wrote :

Just one question, is this going to be addressed in trusty? Upstream has fixed this, already:

Revision history for this message
Toni Förster (stonerl) wrote :
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package grub2 - 2.02~beta2-25

grub2 (2.02~beta2-25) unstable; urgency=medium

  * Build-depend on dosfstools and mtools on arm64 as well as amd64.

 -- Colin Watson <email address hidden> Fri, 12 Jun 2015 12:29:19 +0100

Changed in grub2 (Ubuntu):
status: Confirmed → Fix Released
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