[Bug 1731626] [NEW] Bash disregards umask: All new files are created world writeable (Posix default)

[Karl Kastner]

Public bug reported:

umask is set in my system set to 022. This is also what umask on the
bash spits out. However, new files are always created with permission
666 and new directories with 777, thus world writeable, as is the posix
default. When I explicitely set umask in my .bashrc, for example to 002,
then the values reported by umask change accordingly, but new files are
still created with mask 666. It is not particular to the gnome or X
environment, as it also hasppens on the terminal as well. Strangely,
this does not necessarily happen to files created deep in the directory
structure, but always to files in the home directory.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: bash 4.4-2ubuntu1.1
ProcVersionSignature: Ubuntu 4.10.0-37.41-generic 4.10.17
Uname: Linux 4.10.0-37-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Nov 11 14:22:28 2017
InstallationDate: Installed on 2015-11-05 (737 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: bash
UpgradeStatus: Upgraded to zesty on 2017-10-16 (26 days ago)

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1731626

Title:
  Bash disregards umask: All new files are created world writeable
  (Posix default)

Status in bash package in Ubuntu:
  New

Bug description:
  umask is set in my system set to 022. This is also what umask on the
  bash spits out. However, new files are always created with permission
  666 and new directories with 777, thus world writeable, as is the
  posix default. When I explicitely set umask in my .bashrc, for example
  to 002, then the values reported by umask change accordingly, but new
  files are still created with mask 666. It is not particular to the
  gnome or X environment, as it also hasppens on the terminal as well.
  Strangely, this does not necessarily happen to files created deep in
  the directory structure, but always to files in the home directory.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: bash 4.4-2ubuntu1.1
  ProcVersionSignature: Ubuntu 4.10.0-37.41-generic 4.10.17
  Uname: Linux 4.10.0-37-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.4-0ubuntu4.5
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sat Nov 11 14:22:28 2017
  InstallationDate: Installed on 2015-11-05 (737 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: bash
  UpgradeStatus: Upgraded to zesty on 2017-10-16 (26 days ago)

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