[Bug 1083605] Re: env not changed in acc. with ~/.pam_environment if /home is on nfs

[Gunnar Hjalmarsson]

On 2013-01-23 22:57, Steve Langasek wrote:
> Well, I suppose we want to call setfsuid() before trying to read
> ~/.pam_environment from pam_env;

If I understand the code correctly, handle_env() in
modules/pam_env/pam_env.c calls pam_modutil_drop_priv() in
libpam/pam_modutil_priv.c where setfsuid() is called.

In the accountsservice fix of this bug we call setresuid(), and that
seems to make a difference on NFS.

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https://bugs.launchpad.net/bugs/1083605

Title:
  env not changed in acc. with ~/.pam_environment if /home is on nfs

Status in “accountsservice” package in Ubuntu:
  Fix Released
Status in “pam” package in Ubuntu:
  New

Bug description:
  When using localization setup from the login screen, the choice
  doesn't work because of a permission error, if the user's home
  directory is mounted with nfs. The problem happens because this is
  done by root, usually not able to write over nfs shares. The problem
  disappears if home directories are exported with no_root_squash
  option. So, something is making access as root, instead as user.

  I'm using Precise.

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