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[Rolf Leggewie <968218@xxxxxxxxxxxxxxxxxx>]

lucid has seen the end of its life and is no longer receiving any
updates. Marking the lucid task for this ticket as "Won't Fix".

** Changed in: libxi (Ubuntu Lucid)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/968218

Title:
  ssh x11 forwarding precise to oneiric causes glibc malloc(): memory
  corruption

Status in libxi package in Ubuntu:
  Fix Released
Status in libxi source package in Lucid:
  Won't Fix
Status in libxi source package in Oneiric:
  Fix Released
Status in libxi source package in Precise:
  Fix Released

Bug description:
  [Problem]
  SSHing (with X11 forwarding enabled) from a Precise machine to an Oneiric machine and running certain X11 forwarded programs causes a crash of the program, either immediately or on the first mouse click on that program's window.

  [Impact]
  I have seen this on two client machines (a laptop and a desktop) running the latest precise release, connecting to either the oneiric desktop release or oneiric server release on the server side.  I have also reproduced this with two VirtualBox VMs, connected together with host-only networking and with desktop releases of Oneiric and Precise installed.

  [Development Fix]
  Bug is a recognized upstream bug.  When the xserver sends an unknown device class, pointers to incorrect chunks of memory are set up.  The upstream patch fixes this by automatically skipping any unknown classes.

  http://cgit.freedesktop.org/xorg/lib/libXi/commit/?h=libXi-1.4-branch&id=22e9ace88d57803ecda95db7c9355a614db1902a

  This is fixed in Precise already.
  Debian also picked up the patch:  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=660411

  [Stable Fix]
  A backport of the above patch is provided in the following debdiff:
  https://bugs.launchpad.net/ubuntu/+source/libxi/+bug/968218/+attachment/3053962/+files/libxi_1.4.3-3ubuntu1.1.debdiff

  Backport from upstream commit 22e9ace88d on the 1.4 branch to not
  corrupt memory when the server sends unknown device classes. Minor
  changes were needed because of the XI2.1 ubuntu specific patch.

  [Text Case]
  - On client machine, install Precise with all updates as of 2012-03-29.
  - On server machine, install Oneiric with all updates as of 2012-03-29.
  - Set up host-only networking so that machines can ssh to each other.
  - On client machine, "ssh -X" to the server machine.  Then run an X11 application.  Some applications will crash immediately or on the first mouse click on that application.

  On my test VirtualBox setup, applications that always crash on first click:
  - gnome-terminal
  - nautilus
  - aisleriot solitaire
  - gnome-control-center
  - file-roller
  - brasero
  - gcalctool
  - palimpsest

  Applications that do not crash:
  - Libre Office
  - gimp
  - banshee
  - firefox
  - thunderbird

  Obviously, this isn't an exhaustive list.  When applications crash,
  they spew out a large error message.  On my desktop machine, sshing in
  to an Oneiric Server install on a physical machine, the programs crash
  immediately without showing a window, but on my test setup with two
  VirtualBox VMs, you first have to click on the window to cause it to
  crash.  Sample crash output is attched to this bug report in the
  crash_output.txt file.

  [Regression Potential]
  None known, after several months testing and usage in Precise as well as upstream.  The patch does change how pointers and memory initialization is done, so bears the usual risks associated with any such change; notably one arg to copy_classes() changes type from int to pointer, but it's an internal function and all callers have been properly adjusted.  The patch proposed for oneiric is a slightly modified version of what went into precise, but those changes were merely to make it apply against our patched xserver.

  Things to look for in spotting potential regressions would be software
  or xserver crashes, with backtraces that pass through libxi functions.
  So, regressions would be fairly obvious with even light testing.

  [Original Report]
  SSHing (with X11 forwarding enabled) from a Precise machine to an Oneiric machine and running certain X11 forwarded programs causes a crash of the program, either immediately or on the first mouse click on that program's window.

  I have seen this on two client machines (a laptop and a desktop)
  running the latest precise release, connecting to either the oneiric
  desktop release or oneiric server release on the server side.  I have
  also reproduced this with two VirtualBox VMs, connected together with
  host-only networking and with desktop releases of Oneiric and Precise
  installed.

  To reproduce:
  - On client machine, install Precise with all updates as of 2012-03-29.
  - On server machine, install Oneiric with all updates as of 2012-03-29.
  - Set up host-only networking so that machines can ssh to each other.
  - On client machine, "ssh -X" to the server machine.  Then run an X11 application.  Some applications will crash immediately or on the first mouse click on that application.

  On my test VirtualBox setup, applications that always crash on first click:
  - gnome-terminal
  - nautilus
  - aisleriot solitaire
  - gnome-control-center
  - file-roller
  - brasero
  - gcalctool
  - palimpsest

  Applications that do not crash:
  - Libre Office
  - gimp
  - banshee
  - firefox
  - thunderbird

  Obviously, this isn't an exhaustive list.  When applications crash,
  they spew out a large error message.  On my desktop machine, sshing in
  to an Oneiric Server install on a physical machine, the programs crash
  immediately without showing a window, but on my test setup with two
  VirtualBox VMs, you first have to click on the window to cause it to
  crash.  Sample crash output is attched to this bug report in the
  crash_output.txt file.

  OS and Software Versions:

  Client:
  =====
  lsb_release -rd:
  Description:	Ubuntu precise (development branch)
  Release:	12.04

  apt-cache policy xorg:
  xorg:
    Installed: 1:7.6+12ubuntu1
    Candidate: 1:7.6+12ubuntu1
    Version table:
   *** 1:7.6+12ubuntu1 0
          500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
          100 /var/lib/dpkg/status

  Server:
  ======
  lsb_release -rd:
  Description:	Ubuntu 11.10
  Release:	11.10

  apt-cache policy xorg:
  xorg:
    Installed: 1:7.6+7ubuntu7.1
    Candidate: 1:7.6+7ubuntu7.1
    Version table:
   *** 1:7.6+7ubuntu7.1 0
          500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu/ oneiric-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ oneiric-security/main amd64 Packages
          100 /var/lib/dpkg/status
       1:7.6+7ubuntu7 0
          500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Thu Mar 29 13:32:19 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 4.1.10, 3.2.0-20-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64+mac (20120327.1)
  MachineType: Dell Inc. OptiPlex 960
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic root=UUID=587e726d-6c02-4c7f-aec3-843dbfd68f4c ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/31/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0F428D
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd07/31/2009:svnDellInc.:pnOptiPlex960:pvr:rvnDellInc.:rn0F428D:rvrA00:cvnDellInc.:ct3:cvr:
  dmi.product.name: OptiPlex 960
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.7.2-0ubuntu4
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

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