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>Appendix E. Release Notes</TD
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><H1
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><A
NAME="RELEASE-9-2-4"
>E.21. Release 9.2.4</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2013-04-04</P
></DIV
><P
> This release contains a variety of fixes from 9.2.3.
For information about new features in the 9.2 major release, see
<A
HREF="release-9-2.html"
>Section E.25</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN113663"
>E.21.1. Migration to Version 9.2.4</A
></H2
><P
> A dump/restore is not required for those running 9.2.X.
</P
><P
> However, this release corrects several errors in management of GiST
indexes. After installing this update, it is advisable to
<TT
CLASS="COMMAND"
>REINDEX</TT
> any GiST indexes that meet one or more of the
conditions described below.
</P
><P
> Also, if you are upgrading from a version earlier than 9.2.2,
see <A
HREF="release-9-2-2.html"
>Section E.23</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN113670"
>E.21.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix insecure parsing of server command-line switches (Mitsumasa
Kondo, Kyotaro Horiguchi)
</P
><P
> A connection request containing a database name that begins with
<SPAN
CLASS="QUOTE"
>"<TT
CLASS="LITERAL"
>-</TT
>"</SPAN
> could be crafted to damage or destroy
files within the server's data directory, even if the request is
eventually rejected. (CVE-2013-1899)
</P
></LI
><LI
><P
> Reset OpenSSL randomness state in each postmaster child process
(Marko Kreen)
</P
><P
> This avoids a scenario wherein random numbers generated by
<TT
CLASS="FILENAME"
>contrib/pgcrypto</TT
> functions might be relatively easy for
another database user to guess. The risk is only significant when
the postmaster is configured with <TT
CLASS="VARNAME"
>ssl</TT
> = <TT
CLASS="LITERAL"
>on</TT
>
but most connections don't use SSL encryption. (CVE-2013-1900)
</P
></LI
><LI
><P
> Make REPLICATION privilege checks test current user not authenticated
user (Noah Misch)
</P
><P
> An unprivileged database user could exploit this mistake to call
<CODE
CLASS="FUNCTION"
>pg_start_backup()</CODE
> or <CODE
CLASS="FUNCTION"
>pg_stop_backup()</CODE
>,
thus possibly interfering with creation of routine backups.
(CVE-2013-1901)
</P
></LI
><LI
><P
> Fix GiST indexes to not use <SPAN
CLASS="QUOTE"
>"fuzzy"</SPAN
> geometric comparisons when
it's not appropriate to do so (Alexander Korotkov)
</P
><P
> The core geometric types perform comparisons using <SPAN
CLASS="QUOTE"
>"fuzzy"</SPAN
>
equality, but <CODE
CLASS="FUNCTION"
>gist_box_same</CODE
> must do exact comparisons,
else GiST indexes using it might become inconsistent. After installing
this update, users should <TT
CLASS="COMMAND"
>REINDEX</TT
> any GiST indexes on
<TT
CLASS="TYPE"
>box</TT
>, <TT
CLASS="TYPE"
>polygon</TT
>, <TT
CLASS="TYPE"
>circle</TT
>, or <TT
CLASS="TYPE"
>point</TT
>
columns, since all of these use <CODE
CLASS="FUNCTION"
>gist_box_same</CODE
>.
</P
></LI
><LI
><P
> Fix erroneous range-union and penalty logic in GiST indexes that use
<TT
CLASS="FILENAME"
>contrib/btree_gist</TT
> for variable-width data types, that is
<TT
CLASS="TYPE"
>text</TT
>, <TT
CLASS="TYPE"
>bytea</TT
>, <TT
CLASS="TYPE"
>bit</TT
>, and <TT
CLASS="TYPE"
>numeric</TT
>
columns (Tom Lane)
</P
><P
> These errors could result in inconsistent indexes in which some keys
that are present would not be found by searches, and also in useless
index bloat. Users are advised to <TT
CLASS="COMMAND"
>REINDEX</TT
> such indexes
after installing this update.
</P
></LI
><LI
><P
> Fix bugs in GiST page splitting code for multi-column indexes
(Tom Lane)
</P
><P
> These errors could result in inconsistent indexes in which some keys
that are present would not be found by searches, and also in indexes
that are unnecessarily inefficient to search. Users are advised to
<TT
CLASS="COMMAND"
>REINDEX</TT
> multi-column GiST indexes after installing this
update.
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>gist_point_consistent</CODE
>
to handle fuzziness consistently (Alexander Korotkov)
</P
><P
> Index scans on GiST indexes on <TT
CLASS="TYPE"
>point</TT
> columns would sometimes
yield results different from a sequential scan, because
<CODE
CLASS="FUNCTION"
>gist_point_consistent</CODE
> disagreed with the underlying
operator code about whether to do comparisons exactly or fuzzily.
</P
></LI
><LI
><P
> Fix buffer leak in WAL replay (Heikki Linnakangas)
</P
><P
> This bug could result in <SPAN
CLASS="QUOTE"
>"incorrect local pin count"</SPAN
> errors
during replay, making recovery impossible.
</P
></LI
><LI
><P
> Ensure we do crash recovery before entering archive recovery, if the
database was not stopped cleanly and a <TT
CLASS="FILENAME"
>recovery.conf</TT
> file
is present (Heikki Linnakangas, Kyotaro Horiguchi, Mitsumasa Kondo)
</P
><P
> This is needed to ensure that the database is consistent in certain
scenarios, such as initializing a standby server with a filesystem
snapshot from a running server.
</P
></LI
><LI
><P
> Avoid deleting not-yet-archived WAL files during crash recovery
(Heikki Linnakangas, Fujii Masao)
</P
></LI
><LI
><P
> Fix race condition in <TT
CLASS="COMMAND"
>DELETE RETURNING</TT
> (Tom Lane)
</P
><P
> Under the right circumstances, <TT
CLASS="COMMAND"
>DELETE RETURNING</TT
> could
attempt to fetch data from a shared buffer that the current process
no longer has any pin on. If some other process changed the buffer
meanwhile, this would lead to garbage <TT
CLASS="LITERAL"
>RETURNING</TT
> output, or
even a crash.
</P
></LI
><LI
><P
> Fix infinite-loop risk in regular expression compilation (Tom Lane,
Don Porter)
</P
></LI
><LI
><P
> Fix potential null-pointer dereference in regular expression compilation
(Tom Lane)
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>to_char()</CODE
> to use ASCII-only case-folding rules where
appropriate (Tom Lane)
</P
><P
> This fixes misbehavior of some template patterns that should be
locale-independent, but mishandled <SPAN
CLASS="QUOTE"
>"<TT
CLASS="LITERAL"
>I</TT
>"</SPAN
> and
<SPAN
CLASS="QUOTE"
>"<TT
CLASS="LITERAL"
>i</TT
>"</SPAN
> in Turkish locales.
</P
></LI
><LI
><P
> Fix unwanted rejection of timestamp <TT
CLASS="LITERAL"
>1999-12-31 24:00:00</TT
>
(Tom Lane)
</P
></LI
><LI
><P
> Fix SQL-language functions to be safely usable as support
functions for range types (Tom Lane)
</P
></LI
><LI
><P
> Fix logic error when a single transaction does <TT
CLASS="COMMAND"
>UNLISTEN</TT
>
then <TT
CLASS="COMMAND"
>LISTEN</TT
> (Tom Lane)
</P
><P
> The session wound up not listening for notify events at all, though it
surely should listen in this case.
</P
></LI
><LI
><P
> Fix possible planner crash after columns have been added to a view
that's depended on by another view (Tom Lane)
</P
></LI
><LI
><P
> Fix performance issue in <TT
CLASS="LITERAL"
>EXPLAIN (ANALYZE, TIMING OFF)</TT
>
(Pavel Stehule)
</P
></LI
><LI
><P
> Remove useless <SPAN
CLASS="QUOTE"
>"picksplit doesn't support secondary split"</SPAN
> log
messages (Josh Hansen, Tom Lane)
</P
><P
> This message seems to have been added in expectation of code that was
never written, and probably never will be, since GiST's default
handling of secondary splits is actually pretty good. So stop nagging
end users about it.
</P
></LI
><LI
><P
> Remove vestigial secondary-split support in
<CODE
CLASS="FUNCTION"
>gist_box_picksplit()</CODE
> (Tom Lane)
</P
><P
> Not only was this implementation of secondary-split not better than the
default implementation, it's actually worse. So remove it and let the
default code path handle the case.
</P
></LI
><LI
><P
> Fix possible failure to send a session's last few transaction
commit/abort counts to the statistics collector (Tom Lane)
</P
></LI
><LI
><P
> Eliminate memory leaks in PL/Perl's <CODE
CLASS="FUNCTION"
>spi_prepare()</CODE
> function
(Alex Hunsaker, Tom Lane)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dumpall</SPAN
> to handle database names containing
<SPAN
CLASS="QUOTE"
>"<TT
CLASS="LITERAL"
>=</TT
>"</SPAN
> correctly (Heikki Linnakangas)
</P
></LI
><LI
><P
> Avoid crash in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> when an incorrect connection
string is given (Heikki Linnakangas)
</P
></LI
><LI
><P
> Ignore invalid indexes in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> and
<SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> (Michael Paquier, Bruce Momjian)
</P
><P
> Dumping invalid indexes can cause problems at restore time, for example
if the reason the index creation failed was because it tried to enforce
a uniqueness condition not satisfied by the table's data. Also, if the
index creation is in fact still in progress, it seems reasonable to
consider it to be an uncommitted DDL change, which
<SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> wouldn't be expected to dump anyway.
<SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> now also skips invalid indexes rather than
failing.
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_basebackup</SPAN
>, include only the current server
version's subdirectory when backing up a tablespace (Heikki
Linnakangas)
</P
></LI
><LI
><P
> Add a server version check in <SPAN
CLASS="APPLICATION"
>pg_basebackup</SPAN
> and
<SPAN
CLASS="APPLICATION"
>pg_receivexlog</SPAN
>, so they fail cleanly with version
combinations that won't work (Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix <TT
CLASS="FILENAME"
>contrib/dblink</TT
> to handle inconsistent settings of
<TT
CLASS="VARNAME"
>DateStyle</TT
> or <TT
CLASS="VARNAME"
>IntervalStyle</TT
> safely (Daniel
Farina, Tom Lane)
</P
><P
> Previously, if the remote server had different settings of these
parameters, ambiguous dates might be read incorrectly. This fix
ensures that datetime and interval columns fetched by a
<TT
CLASS="FILENAME"
>dblink</TT
> query will be interpreted correctly. Note however
that inconsistent settings are still risky, since literal values
appearing in SQL commands sent to the remote server might be
interpreted differently than they would be locally.
</P
></LI
><LI
><P
> Fix <TT
CLASS="FILENAME"
>contrib/pg_trgm</TT
>'s <CODE
CLASS="FUNCTION"
>similarity()</CODE
> function
to return zero for trigram-less strings (Tom Lane)
</P
><P
> Previously it returned <TT
CLASS="LITERAL"
>NaN</TT
> due to internal division by zero.
</P
></LI
><LI
><P
> Enable building <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> with Microsoft Visual
Studio 2012 (Brar Piening, Noah Misch)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2013b
for DST law changes in Chile, Haiti, Morocco, Paraguay, and some
Russian areas. Also, historical zone data corrections for numerous
places.
</P
><P
> Also, update the time zone abbreviation files for recent changes in
Russia and elsewhere: <TT
CLASS="LITERAL"
>CHOT</TT
>, <TT
CLASS="LITERAL"
>GET</TT
>,
<TT
CLASS="LITERAL"
>IRKT</TT
>, <TT
CLASS="LITERAL"
>KGT</TT
>, <TT
CLASS="LITERAL"
>KRAT</TT
>, <TT
CLASS="LITERAL"
>MAGT</TT
>,
<TT
CLASS="LITERAL"
>MAWT</TT
>, <TT
CLASS="LITERAL"
>MSK</TT
>, <TT
CLASS="LITERAL"
>NOVT</TT
>, <TT
CLASS="LITERAL"
>OMST</TT
>,
<TT
CLASS="LITERAL"
>TKT</TT
>, <TT
CLASS="LITERAL"
>VLAT</TT
>, <TT
CLASS="LITERAL"
>WST</TT
>, <TT
CLASS="LITERAL"
>YAKT</TT
>,
<TT
CLASS="LITERAL"
>YEKT</TT
> now follow their current meanings, and
<TT
CLASS="LITERAL"
>VOLT</TT
> (Europe/Volgograd) and <TT
CLASS="LITERAL"
>MIST</TT
>
(Antarctica/Macquarie) are added to the default abbreviations list.
</P
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