[PostGIS] #6055: Specify search_path carefully during extension install

[PostGIS]

#6055: Specify search_path carefully during extension install
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  Reporter:  pramsey  |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  high     |  Milestone:  PostGIS 3.6.2
 Component:  postgis  |    Version:  3.2.x
Resolution:           |   Keywords:
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Comment (by Paul Ramsey <pramsey@…>):

 In [changeset:"d1b44c115e202fbec8fb6238f821f38b7efc6ef0/git" d1b44c1/git]:
 {{{#!CommitTicketReference repository="git"
 revision="d1b44c115e202fbec8fb6238f821f38b7efc6ef0"
 Remove rare extension priv escalation case, where account
 with extension create privs can escalate to superuser
 by piggy backing on an extension creation event.
 From Sven Klemm (Tiger Data) and Allistair Ishmael Hakim (allistair.sh)
 References #6055
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6055#comment:2>
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