Ubuntu
user-mode-linux package

Stack limit testing broken in Lucid

Bug #617944 reported by Soren Hansen
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
user-mode-linux (Ubuntu)
Invalid
Undecided
Unassigned
Lucid
Fix Released
Undecided
Unassigned

Bug Description

Binary package hint: user-mode-linux

user-mode-linux builds against the linux-source-2.6.32 package. At the time user-mode-linux was built, the kernel source package had a bug in the stack limit checking in fs/exec.c. This makes virtually everything in uml fail miserably. Luckily, this bug has been fixed in linux-source-2.6.32, so a simple rebuild will fix everything.

Test case:
wget http://cloonix.net/downloads/guests_64_bits/ubuntu_uml.tar.bz2
tar xjf ubuntu_uml.tar.bz2
linux ubd0=ubuntu_uml root=/dev/udba

It's supposed to give you a root prompt in properly booted, usable Lucid system. With the broken package, it'll fail *somehow*. If it doesn't segfault on you straight away, or spew a whole bunch of errors from upstart about stuff like "hostname" or some mount getting killed, it'll probably dump you in a root shell with pid 1 and stderr pointed nowhere.

Revision history for this message
Soren Hansen (soren) wrote :

Oh, and this will require a completely different fix in maverick (where it'll ftbfs, because linux-source-2.6.32 isn't available there anymore), so the usual rule of fixing it in the dev release doesn't apply here.

Changed in user-mode-linux (Ubuntu Lucid):
status: New → Triaged
Changed in user-mode-linux (Ubuntu):
status: New → Invalid
Revision history for this message
Soren Hansen (soren) wrote :

Targeted for lucid, and marked the primary bug task invalid, since it doesn't apply to maverick.

Revision history for this message
Martin Pitt (pitti) wrote : Please test proposed package

Accepted user-mode-linux into lucid-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

Changed in user-mode-linux (Ubuntu Lucid):
status: Triaged → Fix Committed
tags: added: verification-needed
Revision history for this message
Vish Ishaya (vishvananda) wrote :

Fixed package works for me.

Martin Pitt (pitti)
tags: added: verification-done
removed: verification-needed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package user-mode-linux - 2.6.32-1um-3ubuntu3.1

---------------
user-mode-linux (2.6.32-1um-3ubuntu3.1) lucid-proposed; urgency=low

  * No change upload to build against fresh kernel. (LP: #617944)
 -- Soren Hansen <email address hidden> Sat, 14 Aug 2010 21:07:10 +0200

Changed in user-mode-linux (Ubuntu Lucid):
status: Fix Committed → Fix Released
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