pam-auth-update spews Perl warnings while processing a valid profile file

[Daniel Richard G.]

Binary package hint: libpam-runtime

This bug report is an offshoot of bug #295441. pam-auth-update (from libpam-runtime 1.0.1-4ubuntu5.5 in Intrepid) no longer generates an invalid PAM config file, but it is still producing copious Perl warnings while processing the attached (well-formed) authentication profile file:

# /usr/sbin/pam-auth-update
 Use of uninitialized value $3 in split at /usr/sbin/pam-auth-update line 607, <CURRENT> line 27.
 Use of uninitialized value $curmod in quotemeta at /usr/sbin/pam-auth-update line 615, <CURRENT> line 27.
 Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 637, <CURRENT> line 27.
 Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 637, <CURRENT> line 27.
...

[Steve Langasek (vorlon)]

Is this problem still reproducible for you with pam-auth-update in a currently supported version of Ubuntu? If so, can you please attach a tarball of /usr/share/pam-configs and /var/lib/pam?

[Launchpad Janitor (janitor)]

[Expired for pam (Ubuntu) because there has been no activity for 60 days.]

[Daniel Richard G. (skunk)]

This bug appears to have gone away---I can no longer get any Perl warnings out of pam-auth-update in Natty with the PAM config from bug 295441.

[John Brooker (john-brooker)]

This bug appears to be present in lucid 10.04 (libpam-runtime 1.1.1-2ubuntu5.4 ):

# pam-auth-update --package
Use of uninitialized value $3 in split at /usr/sbin/pam-auth-update line 624, <CURRENT> line 25.
Use of uninitialized value $curmod in quotemeta at /usr/sbin/pam-auth-update line 632, <CURRENT> line 25.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 654, <CURRENT> line 25.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 654, <CURRENT> line 25.
Use of uninitialized value $3 in split at /usr/sbin/pam-auth-update line 624, <CURRENT> line 25.
Use of uninitialized value $curmod in quotemeta at /usr/sbin/pam-auth-update line 632, <CURRENT> line 25.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 654, <CURRENT> line 25.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 654, <CURRENT> line 25.

The regex and variable assignments appear to assume that there will always be an argument to a particular pam module, which is logically incorrect:
623 $line =~ /^((\[[^]]+\]|\w+)\s+\S+)\s*(.*)/;
624 @prev_opts = split(/\s+/,$3);

[Qaxi (qaxi)]

wow ... the bug still exists ...
$ sudo pam-auth-update
Use of uninitialized value $3 in split at /usr/sbin/pam-auth-update line 623, <CURRENT> line 18.
Use of uninitialized value $curmod in quotemeta at /usr/sbin/pam-auth-update line 631, <CURRENT> line 18.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 18.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 18.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 18.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 18.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 18.
Use of uninitialized value $3 in split at /usr/sbin/pam-auth-update line 623, <CURRENT> line 30.
Use of uninitialized value $curmod in quotemeta at /usr/sbin/pam-auth-update line 631, <CURRENT> line 30.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 30.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 30.
Use of uninitialized value $3 in split at /usr/sbin/pam-auth-update line 623, <CURRENT> line 30.
Use of uninitialized value $curmod in quotemeta at /usr/sbin/pam-auth-update line 631, <CURRENT> line 30.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 30.
Use of uninitialized value $curmod in hash element at /usr/sbin/pam-auth-update line 653, <CURRENT> line 30.

I am attaching my pam files added to /usr/share/pam-configs

[Qaxi (qaxi)]

and the othe file in /usr/share/pam-configs

[Steve Langasek (vorlon)]

On Thu, Dec 05, 2013 at 10:26:00AM -0000, Qaxi wrote:
> wow ... the bug still exists ...

Please file a new bug report for the problem you're seeing, instead of
following up to one that the original submitter said was no longer
reproducible.

And as requested in comment #1, please attach the complete contents of your
/usr/share/pam-configs and /var/lib/pam directories.