[Bug 64870] Re: su segfaults when you press Ctrl-D

[Kees Cook]

Thanks for helping diagnose this problem.  I'm closing the bug for now.

** Changed in: shadow (Ubuntu)
 Assignee: (unassigned) = Kees Cook
   Status: Needs Info = Rejected

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[Bug 64870] Re: su segfaults when you press Ctrl-D

[Martin Morrison]

Unfortunately, we're already using Winbind to perform authentication
against a different domain for our Radius server, so I can't use that
solution (tho at some point we may combine our domains or something, at
which point I'll look into that again).

I attempted the rebuild of the woody package, but it didn't work. I'm
actually not too concerned about the crash, now that I know it's origin.
So since this bug isn't actually in an Ubuntu package, it can probably
be closed.

[For reference, the error when building the woody package is:
checking system version (for dynamic loading)... ./configure: line 1379: syntax 
error near unexpected token `('
./configure: line 1379: `  case `(ac_space=' '; set) 21` in'
make: *** [configure-stamp] Error 2
debuild: fatal error at line 768:
]

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[Bug 64870] Re: su segfaults when you press Ctrl-D

[Kees Cook]

** Changed in: shadow (Ubuntu)
   Status: Unconfirmed = Needs Info

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[Bug 64870] Re: su segfaults when you press Ctrl-D

[Kees Cook]

I can't reproduce this.  Do you have any customizations to your PAM
configs or extra modules?

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[Bug 64870] Re: su segfaults when you press Ctrl-D

[Martin Morrison]

Yes, we do, sorry. Didn't think about our PAM changes! :-)

We want to authenticate against a windows server, using libpam_smb.
There was no libpam_smb package in Dapper, so I installed the one from
Woody (there isn't one for Sarge either): libpam-smb 1.1.6-1.1woody1.
The install went fine, and with the config changes below it also works
fine.

I've further verified that this is the cause of the problem by backing
out the config change below: pressing Ctrl-D then doesn't cause su to
segfault.

/etc/pam.d/common-auth contains:

authsufficient  /lib/security/pam_smb_auth.so
authsufficient  pam_unix.so nullok_secure

/etc/pam_smb.conf contains: (though this is likely not very interesting
- just the domain and server to authenticate against)

ensoft
ensoft1

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[Bug 64870] Re: su segfaults when you press Ctrl-D

[Kees Cook]

I think libpam_smb was replaced by the winbind package (which include
pam_winbind).

I suspect your specific issue is with library version differences
between Woody and Edgy.  (In general, it's not too safe to install
cross-distribution .deb files.)  If winbind doesn't work for you, you
might try doing a package rebuild of the libpam-smb package:

- [download the Woody orig.tar.gz, and the diff.gz for libpam-smb]
- tar zxf libpam-smb*orig.tar.gz
- cd libpam-smb-*
- zcat ../libpam-smb*.diff.gz | patch -p1
- debuild -b -uc -us
- dpkg -i ../libpam-smb*.deb


** This bug is no longer flagged as a security issue

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[Bug 64870] Re: su segfaults when you press Ctrl-D

[didier]

I think it could be a dup of bug #59730

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