Public bug reported:
Binary package hint: gdm
When adding a user (guest) to the nopasswdlogin group, it is permitted to login
via gdm without providing credentials. In my setup, user listing at login
screen is enabled and pam_mkhomedir is active every time the guest user logs
in. After choosing the user guest, gdm displays a screen lacking the password
input box (which is correct) and containing a cancel and a login button.
As pam_mkhomedir takes a moment to copy the full homedir (it is a little big
bigger), the user has the opportunity to click on the login button ( though
this would not be neccessary to login). This in turn causes gdm to crash, see
the attached backtrace (recompiled the original ubuntu gdm package with
DEB_BUILD_OPTIONS="nostrip debug").
After debugging I now believe that the following is happening: on clicking on
the login button, an answer query dbus message is generated, which is then
rejected by the receiver due to no pam authentification request is pending. The
latter is correct, as no password has been asked for, so the answer query dbus
message should only be generated if an pam input query is pending.
The attached patch fixes this by adding a pending_query boolean which is set on
receiving an input request and unset on replying / resetting.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: gdm 2.30.5-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.35-25.44-generic 2.6.35.10
Uname: Linux 2.6.35-25-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Thu Feb 24 10:12:40 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
SHELL=/bin/bash
LANG=de_DE.UTF-8
SourcePackage: gdm
** Affects: gdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug maverick
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https://bugs.launchpad.net/bugs/724205
Title:
gdm crash on using login button with passwordless login enabled
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