Description:
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I'm looking for a kind of middle ground between chrooted fpm environment and non-chrooted env.

Suphp offer:

;Path all scripts have to be in
docroot=/var/www/
;Check wheter script is within DOCUMENT_ROOT
check_vhost_docroot=true

Two different options to specify that a php script has to be in the docroot or else it wont execute. However if the script calls a binary for example with exec() /bin/convert this is doable,so it wont chroot the env just set a restriction on where the php files have to be. This will hinder fpm to run phpfiles added to /tmp etc.


From suphp docs:

check_vhost_docroot:
  Checks wheter the script is within DOCUMENT_ROOT specified by the 
  webserver. This option is intended to avoid symbol links outside of the
  webpage directory. You may want to disable it, when you are using
  mod_vhost_alias or the Alias-directive.
  This option is disabled by default, if at compile-time the
  "--disable-check-docroot" option has been specified, otherwise it is
  enabled by default.


docroot:
  Patterns matching all allowed script directories. This is an 
  additional security check, especially when 
  check_vhost_docroot is disabled. Defaults to "/*" thus
  allowing scripts in any location being run. May contain the 
  "*" character which matches zero to n characters excluding 
  the "/" character. Multiple values are allowed for this 
  setting. May contain variables as described above.


It would be great if php-fpm could offer the same feature as above, please let me know if there is any more info you need.