[Bug 1891552] Re: Segmentation Fault in libpcre2-8-0 when using regex in (cifs) volume

[Daniel von Obernitz]

Thanks for the fix. Do you know when this version will be released in
the focal repository?

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https://bugs.launchpad.net/bugs/1891552

Title:
  Segmentation Fault in libpcre2-8-0 when using regex in (cifs) volume

Status in libpam-mount package in Ubuntu:
  Fix Released
Status in pcre2 package in Ubuntu:
  Invalid

Bug description:
  Hello,

  there seems to be a bug in libpam-mount in version 2.16-10 used in
  Ubuntu 20.04.

  I want to mount a cifs volume with a regex condition.

  <volume fstype="cifs" server="server.example.com" path="folder/%(USER)" mountpoint="/home/%(USER)/SUBFOLDER_%(USER)" options="domain=DOMAIN,dir_mode=0700,file_mode=0700">
    <and>
      <user regex="yes">^[a-z]{3}.*$</user>
    </and>
  </volume>

  At system start the system freezes completely. Then I retested during
  a running session on the command line and I'm getting the error
  message

  Segmentation fault

  when I login to another user.

  If I remove the 'regex="yes"' everything works.
  If I remove the "and" condition everything works.
  If I downgrade the libpam-mount package to version 2.16-3ubuntu0.1 of Ubuntu 18.04 everything works including using the regex condition. In Ubuntu 18.04 everything worked fine as well.

  Best regards
  Daniel

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