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

[Vladimir Smirnov]

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: http://savannah.gnu.org/bugs/?41582
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.

[Ubuntu Foundations Team Bug Bot (crichton)]

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.]

[Launchpad Janitor (janitor)]

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

[Toni Förster (stonerl)]

Just one question, is this going to be addressed in trusty? Upstream has fixed this, already: http://savannah.gnu.org/bugs/?41582#comment5

[Toni Förster (stonerl)]

This was the commit afaik: http://git.savannah.gnu.org/cgit/grub.git/commit/?id=fc535b32b9fe0cd84213724ffba43b98e2da6ab4

[Launchpad Janitor (janitor)]

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