2ping crashes on non-encrypted session

Bug #1786397 reported by Ryan Finnie
This bug affects 1 person
Affects Status Importance Assigned to Milestone
2ping (Ubuntu)
Ryan Finnie

Bug Description


 * When 2ping is being run as a non-encrypted session between two affected 4.1 releases, within a few minutes the client and/or server will crash with "TypeError: 'NoneType' object is not subscriptable" in scheduled_cleanup_sock_class.

 * Clients cannot sustain a 2ping session for more than a few minutes.

 * When configured as a daemon without respawn, this results in a denial of service. (Not default in bionic.)

 * SRU fix adds a type check for the encrypted_sessions peer table, which is not initialized if no encrypted packets have been received.

 * Fixed in commit 4a636763850bcea590fba6066751d13a36c2b28d (https://github.com/rfinnie/2ping/commit/4a636763850bcea590fba6066751d13a36c2b28d) and included in upstream version 4.1.2.

[Test Case]

 * In one windows, run `2ping --listen`

 * In another, run `2ping`

 * Wait up to 5 minutes for TypeError.

[Regression Potential]

 * SRU might not fix issue.

 * SRU fix might break scheduled cleanup of sessions when encryption *is* activated, leading to resource exhaustion.

 * SRU fix might break scheduled cleanup of other data unrelated to encryption.

 * Patch author has tested these scenarios and cannot reproduce any of them.

[Other Info]

 * Originally reported by Github user joe1981alAPR (https://github.com/rfinnie/2ping/issues/5).

Ryan Finnie (fo0bar)
tags: added: bionic
Changed in 2ping (Ubuntu):
assignee: nobody → Ryan Finnie (fo0bar)
importance: Undecided → High
Revision history for this message
Ryan Finnie (fo0bar) wrote :
description: updated
Revision history for this message
Ryan Finnie (fo0bar) wrote :

[ubuntu/bionic-proposed] 2ping 4.1-1ubuntu1 (Waiting for approval)

> Redirecting ubuntu bionic to ubuntu bionic-proposed.
> This upload awaits approval by a distro manager

Changed in 2ping (Ubuntu):
status: New → Confirmed
Ryan Finnie (fo0bar)
Changed in 2ping (Ubuntu):
status: Confirmed → In Progress
Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

The attachment "Fix cleanup crash on non-encrypted sessions" seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

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

tags: added: patch
Revision history for this message
Ryan Finnie (fo0bar) wrote :

Sponsorship isn't needed; upload is waiting for bionic-proposed

Revision history for this message
Brian Murray (brian-murray) wrote : Please test proposed package

Hello Ryan, or anyone else affected,

Accepted 2ping into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/2ping/4.1-1ubuntu1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed 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 https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Changed in 2ping (Ubuntu Bionic):
status: New → Fix Committed
tags: added: verification-needed verification-needed-bionic
Changed in 2ping (Ubuntu):
status: In Progress → Fix Released
Revision history for this message
Ryan Finnie (fo0bar) wrote :

Tested 4.1-1ubuntu1 from bionic-proposed which fixes the issue correctly. No regressions observed.

tags: added: verification-done-bionic
removed: verification-needed-bionic
Ryan Finnie (fo0bar)
tags: added: verification-done
removed: verification-needed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package 2ping - 4.1-1ubuntu1

2ping (4.1-1ubuntu1) bionic; urgency=medium

  * SRU: Fix cleanup crash on non-encrypted sessions (LP: #1786397)

 -- Ryan Finnie <email address hidden> Fri, 10 Aug 2018 04:31:04 +0000

Changed in 2ping (Ubuntu Bionic):
status: Fix Committed → Fix Released
Revision history for this message
Łukasz Zemczak (sil2100) wrote : Update Released

The verification of the Stable Release Update for 2ping 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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