[SRU] X server segfaults when using XTest (xvfb)

The backported patch applies cleanly to xorg-server 2:1.7.6-2ubuntu7.2, affects the single function ProcXTestFakeInput(), works as described, and should be included in proposed 7.3 if possible.

I have attached an isolated diff for inclusion into the proposed package.

+ * Applied patch from upstream git to prevent crash of Xvfb under xpra:
+ https://bugs.launchpad.net/ubuntu/+source/parti-all/+bug/607071
+
+ -- Todd Vierling <email address hidden> Mon, 19 Jul 2010 17:55:31 -0400

Could this be related to a problem I'm having with the command xte in 10.04?

I use xbindkeys + xte to make the fourth button on my Logitech mouse work as a double click of button 1, I have the following in .xbindkeysrc:-

"/usr/bin/xte 'mouseup 9' 'mouseclick 1' 'mouseclick 1' &"
b:9

I.e. when I hit button 9 (which is the fourth button) the xte command above is executed. This works prefectly in 9.04 and 9.10 but just does nothing at all in 10.04. Since xte uses the XTest facility I was wondering if the bug is connected?

chrisisbd: You could install the xorg-server packages from my PPA to find out:

https://launchpad.net/~duh/+archive/lucid-xpra-fix

If those packages do not fix it, I recommend installing ppa-purge (it will show up as a new package in aptitude the first time you add a PPA to your system) and using that to roll xorg-* packages back to the official ones.

The fixed xvfb (only) has been put into my generic PPA: ppa:duh/duh

https://launchpad.net/~duh/+archive/duh

This version builds only the fixed xvfb package, allowing use of the normal lucid-updates xorg-server packages otherwise. The separate ppa:duh/lucid-xpra-fix PPA is now deleted.

-2ubuntu7.4 was released with a different upstream path relating to captive mouse pointers, and this patch addresses a *crash*. Could we please see this make it into -2ubuntu7.5?

+1 for a SRU from me, this is in upstream xserver-1.7-branch and is a good fix.

http://cgit.freedesktop.org/xorg/xserver/commit/?h=server-1.7-branch&id=ad48184752970541aa153bf2961a2d7da1a910b5

SRU request:

Impact: certain uses of XTest cause a null pointer dereference, rendering xpra unusable in Lucid.

This is fixed in the newer xorg-server version in Maverick. I've prepared an SRU for lucid that adds the trivial upstream fix that corrects the issue. See attached debdiff.

+1 for SRU

Accepted xorg-server 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!

Any testers?

I was using -2ubuntu7.5 all day today while snowed in, with Eclipse on top of xpra. Can't get much more stressful testing than that. :)

This bug was fixed in the package xorg-server - 2:1.7.6-2ubuntu7.5

---------------
xorg-server (2:1.7.6-2ubuntu7.5) lucid-proposed; urgency=low

  * debian/patches/203_fix-xtest-lp607071.patch: fix segfault with certain
    uses of XTest because of null pointer dereference. (LP: #607071)
 -- Marc Deslauriers <email address hidden> Mon, 06 Dec 2010 09:38:40 -0500

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