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>E.162. Release 8.1.7</A
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>Release date: </B
>2007-02-05</P
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><P
>   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
   <A
HREF="release-8-1.html"
>Section E.169</A
>.
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>E.162.1. Migration to Version 8.1.7</A
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>    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 <A
HREF="release-8-1-2.html"
>Section E.167</A
>.
   </P
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>     Remove security vulnerabilities that allowed connected users
     to read backend memory (Tom)
    </P
><P
>     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.
    </P
></LI
><LI
><P
>     Fix rare bug wherein btree index page splits could fail
     due to choosing an infeasible split point (Heikki Linnakangas)
    </P
></LI
><LI
><P
>     Improve <TT
CLASS="COMMAND"
>VACUUM</TT
> performance for databases with many tables (Tom)
    </P
></LI
><LI
><P
>     Fix autovacuum to avoid leaving non-permanent transaction IDs in
     non-connectable databases (Alvaro)
    </P
><P
>     This bug affects the 8.1 branch only.
    </P
></LI
><LI
><P
>     Fix for rare Assert() crash triggered by <TT
CLASS="LITERAL"
>UNION</TT
> (Tom)
    </P
></LI
><LI
><P
>     Tighten security of multi-byte character processing for UTF8 sequences
     over three bytes long (Tom)
    </P
></LI
><LI
><P
>     Fix bogus <SPAN
CLASS="QUOTE"
>"permission denied"</SPAN
> failures occurring on Windows
     due to attempts to fsync already-deleted files (Magnus, Tom)
    </P
></LI
><LI
><P
>     Fix possible crashes when an already-in-use PL/pgSQL function is
     updated (Tom)
    </P
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