[Pkg-samba-maint] Bug#799840: libpam-smbpass: installed libpam-smbpass break all local login

[Remi Vanicat]

Package: libpam-smbpass
Version: 4.1.20+dfsg-1
Severity: critical
Justification: breaks the whole system

On one of my computer, when libpam-smbpass is installed, all local login
attempt fail.

su, sudo, login on console, using gdm or sddm all break. Only ssh succed

I've report in log like :

  *** Error in `/usr/lib/x86_64-linux-gnu/sddm/sddm-helper': double free or corruption (fasttop): 0x0000000000a38a70 ***
  *** Error in `gdm-session-worker [pam/gdm-password]': double free or corruption (fasttop): 0x000000000226c960

and error from su like :

  *** Error in `su': double free or corruption (fasttop): 0x000055846363b500 ***

and mostly the same from sudo.

Uninstalling libpam-smbpass fix the problem.

Note that libpam-smbpass was installed but not used nor configured. I could
reinstall it to try debugging stuff.

Thanks
-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (700, 'testing'), (291, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.1.0-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libpam-smbpass depends on:
ii  dpkg            1.18.3
ii  libbsd0         0.7.0-2
ii  libc6           2.19-20
ii  libpam-runtime  1.1.8-3.1
ii  libpam0g        1.1.8-3.1
ii  libtalloc2      2.1.3-1
ii  libwbclient0    2:4.1.20+dfsg-1
ii  samba-common    2:4.1.20+dfsg-1
ii  samba-libs      2:4.1.20+dfsg-1

libpam-smbpass recommends no packages.

Versions of packages libpam-smbpass suggests:
ii  samba  2:4.1.20+dfsg-1