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><A
NAME="RELEASE-9-0-20"
>E.54. Release 9.0.20</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2015-05-22</P
></DIV
><P
> This release contains a variety of fixes from 9.0.19.
For information about new features in the 9.0 major release, see
<A
HREF="release-9-0.html"
>Section E.74</A
>.
</P
><P
> The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> community will stop releasing updates
for the 9.0.X release series in September 2015.
Users are encouraged to update to a newer release branch soon.
</P
><DIV
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><H2
CLASS="SECT2"
><A
NAME="AEN120666"
>E.54.1. Migration to Version 9.0.20</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 9.0.18,
see <A
HREF="release-9-0-18.html"
>Section E.56</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN120671"
>E.54.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Avoid possible crash when client disconnects just before the
authentication timeout expires (Benkocs Norbert Attila)
</P
><P
> If the timeout interrupt fired partway through the session shutdown
sequence, SSL-related state would be freed twice, typically causing a
crash and hence denial of service to other sessions. Experimentation
shows that an unauthenticated remote attacker could trigger the bug
somewhat consistently, hence treat as security issue.
(CVE-2015-3165)
</P
></LI
><LI
><P
> Improve detection of system-call failures (Noah Misch)
</P
><P
> Our replacement implementation of <CODE
CLASS="FUNCTION"
>snprintf()</CODE
> failed to
check for errors reported by the underlying system library calls;
the main case that might be missed is out-of-memory situations.
In the worst case this might lead to information exposure, due to our
code assuming that a buffer had been overwritten when it hadn't been.
Also, there were a few places in which security-relevant calls of other
system library functions did not check for failure.
</P
><P
> It remains possible that some calls of the <CODE
CLASS="FUNCTION"
>*printf()</CODE
>
family of functions are vulnerable to information disclosure if an
out-of-memory error occurs at just the wrong time. We judge the risk
to not be large, but will continue analysis in this area.
(CVE-2015-3166)
</P
></LI
><LI
><P
> In <TT
CLASS="FILENAME"
>contrib/pgcrypto</TT
>, uniformly report decryption failures
as <SPAN
CLASS="QUOTE"
>"Wrong key or corrupt data"</SPAN
> (Noah Misch)
</P
><P
> Previously, some cases of decryption with an incorrect key could report
other error message texts. It has been shown that such variance in
error reports can aid attackers in recovering keys from other systems.
While it's unknown whether <TT
CLASS="FILENAME"
>pgcrypto</TT
>'s specific behaviors
are likewise exploitable, it seems better to avoid the risk by using a
one-size-fits-all message.
(CVE-2015-3167)
</P
></LI
><LI
><P
> Fix incorrect checking of deferred exclusion constraints after a HOT
update (Tom Lane)
</P
><P
> If a new row that potentially violates a deferred exclusion constraint
is HOT-updated (that is, no indexed columns change and the row can be
stored back onto the same table page) later in the same transaction,
the exclusion constraint would be reported as violated when the check
finally occurred, even if the row(s) the new row originally conflicted
with had been deleted.
</P
></LI
><LI
><P
> Prevent improper reordering of antijoins (NOT EXISTS joins) versus
other outer joins (Tom Lane)
</P
><P
> This oversight in the planner has been observed to cause <SPAN
CLASS="QUOTE"
>"could
not find RelOptInfo for given relids"</SPAN
> errors, but it seems possible
that sometimes an incorrect query plan might get past that consistency
check and result in silently-wrong query output.
</P
></LI
><LI
><P
> Fix incorrect matching of subexpressions in outer-join plan nodes
(Tom Lane)
</P
><P
> Previously, if textually identical non-strict subexpressions were used
both above and below an outer join, the planner might try to re-use
the value computed below the join, which would be incorrect because the
executor would force the value to NULL in case of an unmatched outer row.
</P
></LI
><LI
><P
> Fix GEQO planner to cope with failure of its join order heuristic
(Tom Lane)
</P
><P
> This oversight has been seen to lead to <SPAN
CLASS="QUOTE"
>"failed to join all
relations together"</SPAN
> errors in queries involving <TT
CLASS="LITERAL"
>LATERAL</TT
>,
and that might happen in other cases as well.
</P
></LI
><LI
><P
> Fix possible deadlock at startup
when <TT
CLASS="LITERAL"
>max_prepared_transactions</TT
> is too small
(Heikki Linnakangas)
</P
></LI
><LI
><P
> Don't archive useless preallocated WAL files after a timeline switch
(Heikki Linnakangas)
</P
></LI
><LI
><P
> Avoid <SPAN
CLASS="QUOTE"
>"cannot GetMultiXactIdMembers() during recovery"</SPAN
> error
(Álvaro Herrera)
</P
></LI
><LI
><P
> Recursively <CODE
CLASS="FUNCTION"
>fsync()</CODE
> the data directory after a crash
(Abhijit Menon-Sen, Robert Haas)
</P
><P
> This ensures consistency if another crash occurs shortly later. (The
second crash would have to be a system-level crash, not just a database
crash, for there to be a problem.)
</P
></LI
><LI
><P
> Fix autovacuum launcher's possible failure to shut down, if an error
occurs after it receives SIGTERM (Álvaro Herrera)
</P
></LI
><LI
><P
> Cope with unexpected signals in <CODE
CLASS="FUNCTION"
>LockBufferForCleanup()</CODE
>
(Andres Freund)
</P
><P
> This oversight could result in spurious errors about <SPAN
CLASS="QUOTE"
>"multiple
backends attempting to wait for pincount 1"</SPAN
>.
</P
></LI
><LI
><P
> Avoid waiting for WAL flush or synchronous replication during commit of
a transaction that was read-only so far as the user is concerned
(Andres Freund)
</P
><P
> Previously, a delay could occur at commit in transactions that had
written WAL due to HOT page pruning, leading to undesirable effects
such as sessions getting stuck at startup if all synchronous replicas
are down. Sessions have also been observed to get stuck in catchup
interrupt processing when using synchronous replication; this will fix
that problem as well.
</P
></LI
><LI
><P
> Fix crash when manipulating hash indexes on temporary tables
(Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix possible failure during hash index bucket split, if other processes
are modifying the index concurrently (Tom Lane)
</P
></LI
><LI
><P
> Check for interrupts while analyzing index expressions (Jeff Janes)
</P
><P
> <TT
CLASS="COMMAND"
>ANALYZE</TT
> executes index expressions many times; if there are
slow functions in such an expression, it's desirable to be able to
cancel the <TT
CLASS="COMMAND"
>ANALYZE</TT
> before that loop finishes.
</P
></LI
><LI
><P
> Add the name of the target server to object description strings for
foreign-server user mappings (Álvaro Herrera)
</P
></LI
><LI
><P
> Recommend setting <TT
CLASS="LITERAL"
>include_realm</TT
> to 1 when using
Kerberos/GSSAPI/SSPI authentication (Stephen Frost)
</P
><P
> Without this, identically-named users from different realms cannot be
distinguished. For the moment this is only a documentation change, but
it will become the default setting in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.5.
</P
></LI
><LI
><P
> Remove code for matching IPv4 <TT
CLASS="FILENAME"
>pg_hba.conf</TT
> entries to
IPv4-in-IPv6 addresses (Tom Lane)
</P
><P
> This hack was added in 2003 in response to a report that some Linux
kernels of the time would report IPv4 connections as having
IPv4-in-IPv6 addresses. However, the logic was accidentally broken in
9.0. The lack of any field complaints since then shows that it's not
needed anymore. Now we have reports that the broken code causes
crashes on some systems, so let's just remove it rather than fix it.
(Had we chosen to fix it, that would make for a subtle and potentially
security-sensitive change in the effective meaning of
IPv4 <TT
CLASS="FILENAME"
>pg_hba.conf</TT
> entries, which does not seem like a good
thing to do in minor releases.)
</P
></LI
><LI
><P
> While shutting down service on Windows, periodically send status
updates to the Service Control Manager to prevent it from killing the
service too soon; and ensure that <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> will wait for
shutdown (Krystian Bigaj)
</P
></LI
><LI
><P
> Reduce risk of network deadlock when using <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s
non-blocking mode (Heikki Linnakangas)
</P
><P
> When sending large volumes of data, it's important to drain the input
buffer every so often, in case the server has sent enough response data
to cause it to block on output. (A typical scenario is that the server
is sending a stream of NOTICE messages during <TT
CLASS="LITERAL"
>COPY FROM
STDIN</TT
>.) This worked properly in the normal blocking mode, but not
so much in non-blocking mode. We've modified <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>
to opportunistically drain input when it can, but a full defense
against this problem requires application cooperation: the application
should watch for socket read-ready as well as write-ready conditions,
and be sure to call <CODE
CLASS="FUNCTION"
>PQconsumeInput()</CODE
> upon read-ready.
</P
></LI
><LI
><P
> Fix array handling in <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> (Michael Meskes)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
> to sanely handle URIs and conninfo strings as
the first parameter to <TT
CLASS="COMMAND"
>\connect</TT
>
(David Fetter, Andrew Dunstan, Álvaro Herrera)
</P
><P
> This syntax has been accepted (but undocumented) for a long time, but
previously some parameters might be taken from the old connection
instead of the given string, which was agreed to be undesirable.
</P
></LI
><LI
><P
> Suppress incorrect complaints from <SPAN
CLASS="APPLICATION"
>psql</SPAN
> on some
platforms that it failed to write <TT
CLASS="FILENAME"
>~/.psql_history</TT
> at exit
(Tom Lane)
</P
><P
> This misbehavior was caused by a workaround for a bug in very old
(pre-2006) versions of <SPAN
CLASS="APPLICATION"
>libedit</SPAN
>. We fixed it by
removing the workaround, which will cause a similar failure to appear
for anyone still using such versions of <SPAN
CLASS="APPLICATION"
>libedit</SPAN
>.
Recommendation: upgrade that library, or use <SPAN
CLASS="APPLICATION"
>libreadline</SPAN
>.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>'s rule for deciding which casts are
system-provided casts that should not be dumped (Tom Lane)
</P
></LI
><LI
><P
> Fix dumping of views that are just <TT
CLASS="LITERAL"
>VALUES(...)</TT
> but have
column aliases (Tom Lane)
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>, force timeline 1 in the new cluster
(Bruce Momjian)
</P
><P
> This change prevents upgrade failures caused by bogus complaints about
missing WAL history files.
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>, check for improperly non-connectable
databases before proceeding
(Bruce Momjian)
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>, quote directory paths
properly in the generated <TT
CLASS="LITERAL"
>delete_old_cluster</TT
> script
(Bruce Momjian)
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>, preserve database-level freezing info
properly
(Bruce Momjian)
</P
><P
> This oversight could cause missing-clog-file errors for tables within
the <TT
CLASS="LITERAL"
>postgres</TT
> and <TT
CLASS="LITERAL"
>template1</TT
> databases.
</P
></LI
><LI
><P
> Run <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> and <SPAN
CLASS="APPLICATION"
>pg_resetxlog</SPAN
> with
restricted privileges on Windows, so that they don't fail when run by
an administrator (Muhammad Asif Naeem)
</P
></LI
><LI
><P
> Fix slow sorting algorithm in <TT
CLASS="FILENAME"
>contrib/intarray</TT
> (Tom Lane)
</P
></LI
><LI
><P
> Fix compile failure on Sparc V8 machines (Rob Rowan)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2015d
for DST law changes in Egypt, Mongolia, and Palestine, plus historical
changes in Canada and Chile. Also adopt revised zone abbreviations for
the America/Adak zone (HST/HDT not HAST/HADT).
</P
></LI
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