You can of course use pam_umask(8) on Ubuntu as well if you wish.

Thanks

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https://bugs.launchpad.net/bugs/1685754

Title:
  gnome-terminal unduly forces umask=0022

Status in gedit:
  New
Status in gnome-session:
  New
Status in GNOME Terminal:
  Confirmed
Status in Nautilus:
  New
Status in gnome-terminal package in Ubuntu:
  Confirmed

Bug description:
  In order to set the default umask of my users to 027 or 007, I
  followed the instructions provided in 'man pam_umask' :

  In the 'gecos' field of '/etc/passwd', I have inserted 'umask=027' or
  'umask=007' (for myself).

  Then, MOST graphical applications systematically run with the correct
  umask.

  In particular, when I press Alt-F2, run 'xterm sh' and type 'umask',
  it systematically displays 0007.

  But when I press Alt-F2, run 'gnome-terminal -e sh' and type 'umask',
  it systematically displays 0022.

  That is BAD, and is a security issue.

  
  Workaround :  Inside the newly created '/etc/profile.d/umask.sh', and in each 
'~/.bashrc', add following content :
  UMASK="$(grep  -o  "^$USER:.*,umask=0[0-7]*"  /etc/passwd)"
  if  [ "$UMASK" ];  then
    umask  "${UMASK#$USER:*,umask=}"
  fi

  
  In fact, 'gnome-terminal' MUST NOT force umask=022, but keep umask unchanged.

  Thank you in advance for a quick correction.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: gnome-terminal 3.20.2-1ubuntu8
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  CurrentDesktop: X-Cinnamon
  Date: Mon Apr 24 08:36:58 2017
  InstallationDate: Installed on 2017-03-28 (26 days ago)
  InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Beta amd64 (20170321)
  SourcePackage: gnome-terminal
  UpgradeStatus: No upgrade log present (probably fresh install)

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