Re: [gdm-list] GDM - can't login with smart card

[Ray Strode <halfline gmail com>]

Hi,

On Wed, Oct 9, 2013 at 2:24 AM, jarek <jarek poczta srv pl> wrote:
> Hello!
>
>         I've configured Debian Wheezy to use smart cards (with pam-pkcs11) for
> login, and it works fine from console, but fails when I'm trying to
> login by gdm. GDM asks for pin, accepts it and without any error returns
> to login window.
> In the log I see:
>
> authentication succeeded
>
> but gnome session isn't started.
>
> Can someone look inside attached log, and tell me what is wrong ?
Looks like the process that's running the pam conversation is crashing:

Oct  9 08:08:34 ADMIN1 gdm3][3441]: releasing pkcs #11 module...
Oct  9 08:08:35 ADMIN1 gdm3][3441]: authentication succeeded
Oct  9 08:08:35 ADMIN1 gdm3][3441]: ******************* START
********************************
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 0: gdm-session-worker
[pam/gdm3]() [0x40ebeb]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 1: gdm-session-worker
[pam/gdm3]() [0x40efda]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 2:
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf030) [0x7f76dfdf1030]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 3:
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f76dfa8a475]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 4:
/lib/x86_64-linux-gnu/libc.so.6(abort+0x180) [0x7f76dfa8d6f0]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 5:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x1d143) [0x7f76e025b143]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 6:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_private_set+0x25)
[0x7f76e02c4815]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 7:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x1cccb) [0x7f76e025accb]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 8:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_slice_alloc+0x1bd)
[0x7f76e02a248d]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 9:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_string_sized_new+0x1b)
[0x7f76e02a5ccb]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 10: gdm-session-worker
[pam/gdm3](gdm_log_default_handler+0x87) [0x40e957]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 11:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_logv+0x1e3) [0x7f76e028f473]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 12:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_log+0x82) [0x7f76e028f622]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 13: gdm-session-worker
[pam/gdm3]() [0x409d03]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 14:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x135)
[0x7f76e0288355]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 15:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4a688) [0x7f76e0288688]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 16:
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_loop_run+0x72)
[0x7f76e0288a82]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 17: gdm-session-worker
[pam/gdm3]() [0x405bce]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 18:
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd)
[0x7f76dfa76ead]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: Frame 19: gdm-session-worker
[pam/gdm3]() [0x405c71]
Oct  9 08:08:35 ADMIN1 gdm3][3441]: ******************* END
**********************************

This could be a heap corruption bug in pam_pkcs11 (or the pkcs11
module it loads), or it might be this bug maybe:

https://git.gnome.org/browse/gdm/commit/?id=9755ca3a594a01ba7f361684af1c29b49be17856

I'd try the above patch, and if it doesn't help then getting a
stacktrace with more debug information might help.  You might also try
 running valgrind on "su" or something similar to see if there's a
memory corruption issue in the pam module or pkcs11 module.

--Ray