I wrote and tested a patch that fixes the bug. Reading the source code i
found that this:
_pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n",
resp->resp);
So i searched on the auth.log logfile for this log entry and found:
pam_winbind(lightdm:auth): Received [(null)] reply from application
Then i found on a the crashfile stackthread:
#0 __strcasecmp_l_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:293
No locals.
#1 0xb7221398 in _pam_winbind_change_pwd (ctx=<optimized out>) at
../nsswitch/pam_winbind.c:834
msg = {msg_style = 5, msg = 0xb7228f90 "Do you want to change your
password now?"}
pmsg = 0xbfc39810
resp = 0x85831a8
prompt = <optimized out>
ret = <optimized out>
retval = false
So the problem is on the call of strcasecmp with null as first
parameter.
Attached the patch that fixes the issue.
I tested against the latest sources for precise that can be downloaded
with:
apt-get source samba
** Patch added: "Fixes bug adding a check for a null value before calling
strcasecmp"
https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1003296/+attachment/3307085/+files/bug_lp_1003296.diff
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https://bugs.launchpad.net/bugs/1003296
Title:
lightdm crashed with SIGSEGV in _pam_winbind_change_pwd() when
password is expiring
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