[Bug 1067779] [NEW] missing pam_loginuid.so breaks getlogin()

[lakostis]

Public bug reported:

getlogin() call in new glibc checks /proc/self/loginuid presence and
trust its value as most safe source (due it's audit-related nature). But
default /etc/pam.d/common-account doesn't contains entry to
pam_loginuid.so which modify /proc/self/loginuid properly. This breaks
getlogin() at many scenarios like this:

(pam session without pam_loginuid)$  perl -e '$t=getlogin; print "$t\n";'
root
(pam session without pam_loginuid)$  id
uid=1000(...

lust because /proc/self/loginuid contains '0' value

If I add pam_loginuid.so to /etc/pam.d/common-account like
http://manpages.ubuntu.com/manpages/precise/man8/pam_loginuid.8.html
recommend, everything worked as expected:

(pam session with pam_loginuid)$  perl -e '$t=getlogin; print "$t\n";'
user
(pam session with pam_loginuid)$  id
uid=1000(...

# cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"

# dpkg -l|fgrep libpam
ii  libpam-ck-connector                  0.4.5-2                          ConsoleKit PAM module
ii  libpam-modules                       1.1.3-7ubuntu2                   Pluggable Authentication Modules for PAM
ii  libpam-modules-bin                   1.1.3-7ubuntu2                   Pluggable Authentication Modules for PAM - helper binaries
ii  libpam-runtime                       1.1.3-7ubuntu2                   Runtime support for the PAM library
ii  libpam0g                             1.1.3-7ubuntu2                   Pluggable Authentication Modules library

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

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https://bugs.launchpad.net/bugs/1067779

Title:
  missing pam_loginuid.so breaks getlogin()

Status in “pam” package in Ubuntu:
  New

Bug description:
  getlogin() call in new glibc checks /proc/self/loginuid presence and
  trust its value as most safe source (due it's audit-related nature).
  But default /etc/pam.d/common-account doesn't contains entry to
  pam_loginuid.so which modify /proc/self/loginuid properly. This breaks
  getlogin() at many scenarios like this:

  (pam session without pam_loginuid)$  perl -e '$t=getlogin; print "$t\n";'
  root
  (pam session without pam_loginuid)$  id
  uid=1000(...

  lust because /proc/self/loginuid contains '0' value

  If I add pam_loginuid.so to /etc/pam.d/common-account like
  http://manpages.ubuntu.com/manpages/precise/man8/pam_loginuid.8.html
  recommend, everything worked as expected:

  (pam session with pam_loginuid)$  perl -e '$t=getlogin; print "$t\n";'
  user
  (pam session with pam_loginuid)$  id
  uid=1000(...

  # cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=12.04
  DISTRIB_CODENAME=precise
  DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"

  # dpkg -l|fgrep libpam
  ii  libpam-ck-connector                  0.4.5-2                          ConsoleKit PAM module
  ii  libpam-modules                       1.1.3-7ubuntu2                   Pluggable Authentication Modules for PAM
  ii  libpam-modules-bin                   1.1.3-7ubuntu2                   Pluggable Authentication Modules for PAM - helper binaries
  ii  libpam-runtime                       1.1.3-7ubuntu2                   Runtime support for the PAM library
  ii  libpam0g                             1.1.3-7ubuntu2                   Pluggable Authentication Modules library

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