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[Ｖ字龍(Vdragon) <Vdragon.Taiwan@xxxxxxxxx>]

** Summary changed:

- sudo shouldn't preserve HOME environment variable by default
+ sudo shouldn't preserve caller's HOME environment variable by default

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https://bugs.launchpad.net/bugs/1373495

Title:
  sudo shouldn't preserve caller's HOME environment variable by default

Status in “sudo” package in Ubuntu:
  New

Bug description:
  Currently Ubuntu hard-coded sudo to preserve HOME environment variable
  to point to sudo caller's home directory by default(refer bug #760140)
  however this is dangerous and error-prone because the program run by
  root may write files (e.g. $HOME/.Xauthority , program config files)
  into the HOME directory **AS ROOT** which, will cause issue when users
  run the same program as themselves and even make the user failed to
  login(due to .Xauthority file owner is incorrect)

  In my opinion the Ubuntu patch that make $HOME variable keep in sudo
  is INSANE and should be reverted(Ubuntu should use the safest
  configuration to general users by default), any user wish to run
  command as root using their HOME directory should set env_keep in
  /etc/sudoers themselves and acknowledging the consequences.

  RootSudo - Community Help
  Wiki(https://help.ubuntu.com/community/RootSudo ) wrongly tells that
  graphical application shouldn't be launch by sudo, but in fact the
  real issue is in this bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: sudo 1.8.9p5-1ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-17.23-lowlatency 3.16.3
  Uname: Linux 3.16.0-17-lowlatency i686
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: i386
  CurrentDesktop: KDE
  Date: Thu Sep 25 00:08:44 2014
  InstallationDate: Installed on 2013-03-08 (564 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
  SourcePackage: sudo
  UpgradeStatus: Upgraded to trusty on 2014-04-19 (158 days ago)
  VisudoCheck:
   /etc/sudoers: parsed OK
   /etc/sudoers.d/Preserve_input_method_required_environmental_variables: parsed OK
   /etc/sudoers.d/README: parsed OK
  modified.conffile..etc.sudoers.d.README: [modified]
  mtime.conffile..etc.sudoers.d.README: 2014-09-24T22:26:35.734703

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