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>Appendix E. Release Notes</TD
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><H1
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><A
NAME="RELEASE-8-4-22"
>E.75. Release 8.4.22</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2014-07-24</P
></DIV
><P
> This release contains a variety of fixes from 8.4.21.
For information about new features in the 8.4 major release, see
<A
HREF="release-8-4.html"
>Section E.97</A
>.
</P
><P
> This is expected to be the last <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> release
in the 8.4.X series. Users are encouraged to update to a newer
release branch soon.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN124851"
>E.75.1. Migration to Version 8.4.22</A
></H2
><P
> A dump/restore is not required for those running 8.4.X.
</P
><P
> However, this release corrects an index corruption problem in some GiST
indexes. See the first changelog entry below to find out whether your
installation has been affected and what steps you should take if so.
</P
><P
> Also, if you are upgrading from a version earlier than 8.4.19,
see <A
HREF="release-8-4-19.html"
>Section E.78</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN124857"
>E.75.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Correctly initialize padding bytes in <TT
CLASS="FILENAME"
>contrib/btree_gist</TT
>
indexes on <TT
CLASS="TYPE"
>bit</TT
> columns (Heikki Linnakangas)
</P
><P
> This error could result in incorrect query results due to values that
should compare equal not being seen as equal.
Users with GiST indexes on <TT
CLASS="TYPE"
>bit</TT
> or <TT
CLASS="TYPE"
>bit varying</TT
>
columns should <TT
CLASS="COMMAND"
>REINDEX</TT
> those indexes after installing this
update.
</P
></LI
><LI
><P
> Protect against torn pages when deleting GIN list pages (Heikki
Linnakangas)
</P
><P
> This fix prevents possible index corruption if a system crash occurs
while the page update is being written to disk.
</P
></LI
><LI
><P
> Fix possibly-incorrect cache invalidation during nested calls
to <CODE
CLASS="FUNCTION"
>ReceiveSharedInvalidMessages</CODE
> (Andres Freund)
</P
></LI
><LI
><P
> Don't assume a subquery's output is unique if there's a set-returning
function in its targetlist (David Rowley)
</P
><P
> This oversight could lead to misoptimization of constructs
like <TT
CLASS="LITERAL"
>WHERE x IN (SELECT y, generate_series(1,10) FROM t GROUP
BY y)</TT
>.
</P
></LI
><LI
><P
> Fix failure to detoast fields in composite elements of structured
types (Tom Lane)
</P
><P
> This corrects cases where TOAST pointers could be copied into other
tables without being dereferenced. If the original data is later
deleted, it would lead to errors like <SPAN
CLASS="QUOTE"
>"missing chunk number 0
for toast value ..."</SPAN
> when the now-dangling pointer is used.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="QUOTE"
>"record type has not been registered"</SPAN
> failures with
whole-row references to the output of Append plan nodes (Tom Lane)
</P
></LI
><LI
><P
> Fix possible crash when invoking a user-defined function while
rewinding a cursor (Tom Lane)
</P
></LI
><LI
><P
> Fix query-lifespan memory leak while evaluating the arguments for a
function in <TT
CLASS="LITERAL"
>FROM</TT
> (Tom Lane)
</P
></LI
><LI
><P
> Fix session-lifespan memory leaks in regular-expression processing
(Tom Lane, Arthur O'Dwyer, Greg Stark)
</P
></LI
><LI
><P
> Fix data encoding error in <TT
CLASS="FILENAME"
>hungarian.stop</TT
> (Tom Lane)
</P
></LI
><LI
><P
> Fix liveness checks for rows that were inserted in the current
transaction and then deleted by a now-rolled-back subtransaction
(Andres Freund)
</P
><P
> This could cause problems (at least spurious warnings, and at worst an
infinite loop) if <TT
CLASS="COMMAND"
>CREATE INDEX</TT
> or <TT
CLASS="COMMAND"
>CLUSTER</TT
> were
done later in the same transaction.
</P
></LI
><LI
><P
> Clear <TT
CLASS="STRUCTNAME"
>pg_stat_activity</TT
>.<TT
CLASS="STRUCTFIELD"
>xact_start</TT
>
during <TT
CLASS="COMMAND"
>PREPARE TRANSACTION</TT
> (Andres Freund)
</P
><P
> After the <TT
CLASS="COMMAND"
>PREPARE</TT
>, the originating session is no longer in
a transaction, so it should not continue to display a transaction
start time.
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>REASSIGN OWNED</TT
> to not fail for text search objects
(Álvaro Herrera)
</P
></LI
><LI
><P
> Block signals during postmaster startup (Tom Lane)
</P
><P
> This ensures that the postmaster will properly clean up after itself
if, for example, it receives <SPAN
CLASS="SYSTEMITEM"
>SIGINT</SPAN
> while still
starting up.
</P
></LI
><LI
><P
> Secure Unix-domain sockets of temporary postmasters started during
<TT
CLASS="LITERAL"
>make check</TT
> (Noah Misch)
</P
><P
> Any local user able to access the socket file could connect as the
server's bootstrap superuser, then proceed to execute arbitrary code as
the operating-system user running the test, as we previously noted in
CVE-2014-0067. This change defends against that risk by placing the
server's socket in a temporary, mode 0700 subdirectory
of <TT
CLASS="FILENAME"
>/tmp</TT
>. The hazard remains however on platforms where
Unix sockets are not supported, notably Windows, because then the
temporary postmaster must accept local TCP connections.
</P
><P
> A useful side effect of this change is to simplify
<TT
CLASS="LITERAL"
>make check</TT
> testing in builds that
override <TT
CLASS="LITERAL"
>DEFAULT_PGSOCKET_DIR</TT
>. Popular non-default values
like <TT
CLASS="FILENAME"
>/var/run/postgresql</TT
> are often not writable by the
build user, requiring workarounds that will no longer be necessary.
</P
></LI
><LI
><P
> On Windows, allow new sessions to absorb values of PGC_BACKEND
parameters (such as <A
HREF="runtime-config-logging.html#GUC-LOG-CONNECTIONS"
>log_connections</A
>) from the
configuration file (Amit Kapila)
</P
><P
> Previously, if such a parameter were changed in the file post-startup,
the change would have no effect.
</P
></LI
><LI
><P
> Properly quote executable path names on Windows (Nikhil Deshpande)
</P
><P
> This oversight could cause <SPAN
CLASS="APPLICATION"
>initdb</SPAN
>
and <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to fail on Windows, if the installation
path contained both spaces and <TT
CLASS="LITERAL"
>@</TT
> signs.
</P
></LI
><LI
><P
> Fix linking of <SPAN
CLASS="APPLICATION"
>libpython</SPAN
> on OS X (Tom Lane)
</P
><P
> The method we previously used can fail with the Python library
supplied by Xcode 5.0 and later.
</P
></LI
><LI
><P
> Avoid buffer bloat in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> when the server
consistently sends data faster than the client can absorb it
(Shin-ichi Morita, Tom Lane)
</P
><P
> <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> could be coerced into enlarging its input buffer
until it runs out of memory (which would be reported misleadingly
as <SPAN
CLASS="QUOTE"
>"lost synchronization with server"</SPAN
>). Under ordinary
circumstances it's quite far-fetched that data could be continuously
transmitted more quickly than the <CODE
CLASS="FUNCTION"
>recv()</CODE
> loop can
absorb it, but this has been observed when the client is artificially
slowed by scheduler constraints.
</P
></LI
><LI
><P
> Ensure that LDAP lookup attempts in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> time out as
intended (Laurenz Albe)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>'s processing of old-style large object
comments (Tom Lane)
</P
><P
> A direct-to-database restore from an archive file generated by a
pre-9.0 version of <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> would usually fail if the
archive contained more than a few comments for large objects.
</P
></LI
><LI
><P
> In <TT
CLASS="FILENAME"
>contrib/pgcrypto</TT
> functions, ensure sensitive
information is cleared from stack variables before returning
(Marko Kreen)
</P
></LI
><LI
><P
> In <TT
CLASS="FILENAME"
>contrib/uuid-ossp</TT
>, cache the state of the OSSP UUID
library across calls (Tom Lane)
</P
><P
> This improves the efficiency of UUID generation and reduces the amount
of entropy drawn from <TT
CLASS="FILENAME"
>/dev/urandom</TT
>, on platforms that
have that.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2014e
for DST law changes in Crimea, Egypt, and Morocco.
</P
></LI
></UL
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