[Bug 1788459] Re: gssproxy crashes in libselinux.so.1 on Ubuntu 18.04 when called by rpc.gssd

[Andreas Hasenack]

Can you simplify the configuration needed to reproduce this bug? For
example, does it happen when using gssapi authentication with apache,
without the NFSv4 bit?

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Title:
  gssproxy  crashes in libselinux.so.1 on Ubuntu 18.04 when called by
  rpc.gssd

Status in gssproxy package in Ubuntu:
  New
Status in krb5 package in Ubuntu:
  New
Status in libselinux package in Ubuntu:
  New

Bug description:
  
  I have apache configured to perform a kerberized NFS4 mount using rpc.gssd and gssproxy.   

  If I request a web page that requires NFS4 access, then gssproxy
  crashes, reporting a segfault in libselinux.so.1 and the web request
  generates a 403 error.

  gssproxy[6267]: segfault at 0 ip 00007f2f5bb1951a sp 00007ffe861da150
  error 4 in libselinux.so.1[7f2f5bb0d000+25000]

  If I run gssproxy at debug level = 3, and then load a web page, I can
  see the uid/principal request for www-data come in from rpc.gssd:

  # gssproxy -d --debug-level=3 -i -C /etc/gssproxy

  [2018/08/22 17:51:40]: Debug Enabled (level: 3)
  [2018/08/22 17:52:06]: Client [2018/08/22 17:52:06]: (/usr/sbin/rpc.gssd) [2018/08/22 17:52:06]:  connected (fd = 10)[2018/08/22 17:52:06]:  (pid = 4548) (uid = 33) (gid = 33)Segmentation fault (core dumped)

  Since gssproxy is required to initiate kerberos principals for any
  local application services - Ubuntu 18.04 does not currently support
  running application services with NFS4 kerberos dependencies.  This
  has a fairly significant impact on anyone attempting to implement
  kerberos on Ubuntu 18.04

  
  Ubuntu 18.04.1 LTS
  gssproxy 0.8.0-1
  libselinux1:amd64 2.7-2build2
  libgssrpc4:amd64 1.16-2build1

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