E.234. Release 8.1.7
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## E.234. Release 8.1.7

Release date: 2007-02-05

This release contains a variety of fixes from 8.1.6, including a security fix. For information about new features in the 8.1 major release, see Section E.241.

### E.234.1. Migration to Version 8.1.7

A dump/restore is not required for those running 8.1.X. However, if you are upgrading from a version earlier than 8.1.2, see Section E.239.

### E.234.2. Changes

- Remove security vulnerabilities that allowed connected users to read backend memory (Tom)

  The vulnerabilities involve suppressing the normal check that a SQL function returns the data type it's declared to, and changing the data type of a table column (CVE-2007-0555, CVE-2007-0556). These errors can easily be exploited to cause a backend crash, and in principle might be used to read database content that the user should not be able to access.

- Fix rare bug wherein btree index page splits could fail due to choosing an infeasible split point (Heikki Linnakangas)

- Improve `VACUUM` performance for databases with many tables (Tom)

- Fix autovacuum to avoid leaving non-permanent transaction IDs in non-connectable databases (Alvaro)

  This bug affects the 8.1 branch only.

- Fix for rare Assert() crash triggered by `UNION` (Tom)

- Tighten security of multi-byte character processing for UTF8 sequences over three bytes long (Tom)

- Fix bogus “permission denied” failures occurring on Windows due to attempts to fsync already-deleted files (Magnus, Tom)

- Fix possible crashes when an already-in-use PL/pgSQL function is updated (Tom)

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