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>Appendix E. Release Notes</TD
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><H1
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><A
NAME="RELEASE-9-0-9"
>E.65. Release 9.0.9</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2012-08-17</P
></DIV
><P
> This release contains a variety of fixes from 9.0.8.
For information about new features in the 9.0 major release, see
<A
HREF="release-9-0.html"
>Section E.74</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN122109"
>E.65.1. Migration to Version 9.0.9</A
></H2
><P
> A dump/restore is not required for those running 9.0.X.
</P
><P
> However, if you are upgrading from a version earlier than 9.0.6,
see <A
HREF="release-9-0-6.html"
>Section E.68</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN122114"
>E.65.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Prevent access to external files/URLs via XML entity references
(Noah Misch, Tom Lane)
</P
><P
> <CODE
CLASS="FUNCTION"
>xml_parse()</CODE
> would attempt to fetch external files or
URLs as needed to resolve DTD and entity references in an XML value,
thus allowing unprivileged database users to attempt to fetch data
with the privileges of the database server. While the external data
wouldn't get returned directly to the user, portions of it could be
exposed in error messages if the data didn't parse as valid XML; and
in any case the mere ability to check existence of a file might be
useful to an attacker. (CVE-2012-3489)
</P
></LI
><LI
><P
> Prevent access to external files/URLs via <TT
CLASS="FILENAME"
>contrib/xml2</TT
>'s
<CODE
CLASS="FUNCTION"
>xslt_process()</CODE
> (Peter Eisentraut)
</P
><P
> <SPAN
CLASS="APPLICATION"
>libxslt</SPAN
> offers the ability to read and write both
files and URLs through stylesheet commands, thus allowing
unprivileged database users to both read and write data with the
privileges of the database server. Disable that through proper use
of <SPAN
CLASS="APPLICATION"
>libxslt</SPAN
>'s security options. (CVE-2012-3488)
</P
><P
> Also, remove <CODE
CLASS="FUNCTION"
>xslt_process()</CODE
>'s ability to fetch documents
and stylesheets from external files/URLs. While this was a
documented <SPAN
CLASS="QUOTE"
>"feature"</SPAN
>, it was long regarded as a bad idea.
The fix for CVE-2012-3489 broke that capability, and rather than
expend effort on trying to fix it, we're just going to summarily
remove it.
</P
></LI
><LI
><P
> Prevent too-early recycling of btree index pages (Noah Misch)
</P
><P
> When we allowed read-only transactions to skip assigning XIDs, we
introduced the possibility that a deleted btree page could be
recycled while a read-only transaction was still in flight to it.
This would result in incorrect index search results. The probability
of such an error occurring in the field seems very low because of the
timing requirements, but nonetheless it should be fixed.
</P
></LI
><LI
><P
> Fix crash-safety bug with newly-created-or-reset sequences (Tom Lane)
</P
><P
> If <TT
CLASS="COMMAND"
>ALTER SEQUENCE</TT
> was executed on a freshly created or
reset sequence, and then precisely one <CODE
CLASS="FUNCTION"
>nextval()</CODE
> call
was made on it, and then the server crashed, WAL replay would restore
the sequence to a state in which it appeared that no
<CODE
CLASS="FUNCTION"
>nextval()</CODE
> had been done, thus allowing the first
sequence value to be returned again by the next
<CODE
CLASS="FUNCTION"
>nextval()</CODE
> call. In particular this could manifest for
<TT
CLASS="TYPE"
>serial</TT
> columns, since creation of a serial column's sequence
includes an <TT
CLASS="COMMAND"
>ALTER SEQUENCE OWNED BY</TT
> step.
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>txid_current()</CODE
> to report the correct epoch when not
in hot standby (Heikki Linnakangas)
</P
><P
> This fixes a regression introduced in the previous minor release.
</P
></LI
><LI
><P
> Fix bug in startup of Hot Standby when a master transaction has many
subtransactions (Andres Freund)
</P
><P
> This mistake led to failures reported as <SPAN
CLASS="QUOTE"
>"out-of-order XID
insertion in KnownAssignedXids"</SPAN
>.
</P
></LI
><LI
><P
> Ensure the <TT
CLASS="FILENAME"
>backup_label</TT
> file is fsync'd after
<CODE
CLASS="FUNCTION"
>pg_start_backup()</CODE
> (Dave Kerr)
</P
></LI
><LI
><P
> Fix timeout handling in walsender processes (Tom Lane)
</P
><P
> WAL sender background processes neglected to establish a
<SPAN
CLASS="SYSTEMITEM"
>SIGALRM</SPAN
> handler, meaning they would wait forever in
some corner cases where a timeout ought to happen.
</P
></LI
><LI
><P
> Back-patch 9.1 improvement to compress the fsync request queue
(Robert Haas)
</P
><P
> This improves performance during checkpoints. The 9.1 change
has now seen enough field testing to seem safe to back-patch.
</P
></LI
><LI
><P
> Fix <TT
CLASS="LITERAL"
>LISTEN</TT
>/<TT
CLASS="LITERAL"
>NOTIFY</TT
> to cope better with I/O
problems, such as out of disk space (Tom Lane)
</P
><P
> After a write failure, all subsequent attempts to send more
<TT
CLASS="LITERAL"
>NOTIFY</TT
> messages would fail with messages like
<SPAN
CLASS="QUOTE"
>"Could not read from file "pg_notify/<TT
CLASS="REPLACEABLE"
><I
>nnnn</I
></TT
>" at
offset <TT
CLASS="REPLACEABLE"
><I
>nnnnn</I
></TT
>: Success"</SPAN
>.
</P
></LI
><LI
><P
> Only allow autovacuum to be auto-canceled by a directly blocked
process (Tom Lane)
</P
><P
> The original coding could allow inconsistent behavior in some cases;
in particular, an autovacuum could get canceled after less than
<TT
CLASS="LITERAL"
>deadlock_timeout</TT
> grace period.
</P
></LI
><LI
><P
> Improve logging of autovacuum cancels (Robert Haas)
</P
></LI
><LI
><P
> Fix log collector so that <TT
CLASS="LITERAL"
>log_truncate_on_rotation</TT
> works
during the very first log rotation after server start (Tom Lane)
</P
></LI
><LI
><P
> Fix <TT
CLASS="LITERAL"
>WITH</TT
> attached to a nested set operation
(<TT
CLASS="LITERAL"
>UNION</TT
>/<TT
CLASS="LITERAL"
>INTERSECT</TT
>/<TT
CLASS="LITERAL"
>EXCEPT</TT
>)
(Tom Lane)
</P
></LI
><LI
><P
> Ensure that a whole-row reference to a subquery doesn't include any
extra <TT
CLASS="LITERAL"
>GROUP BY</TT
> or <TT
CLASS="LITERAL"
>ORDER BY</TT
> columns (Tom Lane)
</P
></LI
><LI
><P
> Disallow copying whole-row references in <TT
CLASS="LITERAL"
>CHECK</TT
>
constraints and index definitions during <TT
CLASS="COMMAND"
>CREATE TABLE</TT
>
(Tom Lane)
</P
><P
> This situation can arise in <TT
CLASS="COMMAND"
>CREATE TABLE</TT
> with
<TT
CLASS="LITERAL"
>LIKE</TT
> or <TT
CLASS="LITERAL"
>INHERITS</TT
>. The copied whole-row
variable was incorrectly labeled with the row type of the original
table not the new one. Rejecting the case seems reasonable for
<TT
CLASS="LITERAL"
>LIKE</TT
>, since the row types might well diverge later. For
<TT
CLASS="LITERAL"
>INHERITS</TT
> we should ideally allow it, with an implicit
coercion to the parent table's row type; but that will require more
work than seems safe to back-patch.
</P
></LI
><LI
><P
> Fix memory leak in <TT
CLASS="LITERAL"
>ARRAY(SELECT ...)</TT
> subqueries (Heikki
Linnakangas, Tom Lane)
</P
></LI
><LI
><P
> Fix extraction of common prefixes from regular expressions (Tom Lane)
</P
><P
> The code could get confused by quantified parenthesized
subexpressions, such as <TT
CLASS="LITERAL"
>^(foo)?bar</TT
>. This would lead to
incorrect index optimization of searches for such patterns.
</P
></LI
><LI
><P
> Fix bugs with parsing signed
<TT
CLASS="REPLACEABLE"
><I
>hh</I
></TT
><TT
CLASS="LITERAL"
>:</TT
><TT
CLASS="REPLACEABLE"
><I
>mm</I
></TT
> and
<TT
CLASS="REPLACEABLE"
><I
>hh</I
></TT
><TT
CLASS="LITERAL"
>:</TT
><TT
CLASS="REPLACEABLE"
><I
>mm</I
></TT
><TT
CLASS="LITERAL"
>:</TT
><TT
CLASS="REPLACEABLE"
><I
>ss</I
></TT
>
fields in <TT
CLASS="TYPE"
>interval</TT
> constants (Amit Kapila, Tom Lane)
</P
></LI
><LI
><P
> Use Postgres' encoding conversion functions, not Python's, when
converting a Python Unicode string to the server encoding in
PL/Python (Jan Urbanski)
</P
><P
> This avoids some corner-case problems, notably that Python doesn't
support all the encodings Postgres does. A notable functional change
is that if the server encoding is SQL_ASCII, you will get the UTF-8
representation of the string; formerly, any non-ASCII characters in
the string would result in an error.
</P
></LI
><LI
><P
> Fix mapping of PostgreSQL encodings to Python encodings in PL/Python
(Jan Urbanski)
</P
></LI
><LI
><P
> Report errors properly in <TT
CLASS="FILENAME"
>contrib/xml2</TT
>'s
<CODE
CLASS="FUNCTION"
>xslt_process()</CODE
> (Tom Lane)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2012e
for DST law changes in Morocco and Tokelau
</P
></LI
></UL
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