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><H1
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><A
NAME="RELEASE-9-1-3"
>E.47. Release 9.1.3</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2012-02-27</P
></DIV
><P
> This release contains a variety of fixes from 9.1.2.
For information about new features in the 9.1 major release, see
<A
HREF="release-9-1.html"
>Section E.50</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118577"
>E.47.1. Migration to Version 9.1.3</A
></H2
><P
> A dump/restore is not required for those running 9.1.X.
</P
><P
> However, if you are upgrading from a version earlier than 9.1.2,
see <A
HREF="release-9-1-2.html"
>Section E.48</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118582"
>E.47.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Require execute permission on the trigger function for
<TT
CLASS="COMMAND"
>CREATE TRIGGER</TT
> (Robert Haas)
</P
><P
> This missing check could allow another user to execute a trigger
function with forged input data, by installing it on a table he owns.
This is only of significance for trigger functions marked
<TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
>, since otherwise trigger functions run
as the table owner anyway. (CVE-2012-0866)
</P
></LI
><LI
><P
> Remove arbitrary limitation on length of common name in SSL
certificates (Heikki Linnakangas)
</P
><P
> Both <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> and the server truncated the common name
extracted from an SSL certificate at 32 bytes. Normally this would
cause nothing worse than an unexpected verification failure, but there
are some rather-implausible scenarios in which it might allow one
certificate holder to impersonate another. The victim would have to
have a common name exactly 32 bytes long, and the attacker would have
to persuade a trusted CA to issue a certificate in which the common
name has that string as a prefix. Impersonating a server would also
require some additional exploit to redirect client connections.
(CVE-2012-0867)
</P
></LI
><LI
><P
> Convert newlines to spaces in names written in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>
comments (Robert Haas)
</P
><P
> <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> was incautious about sanitizing object names
that are emitted within SQL comments in its output script. A name
containing a newline would at least render the script syntactically
incorrect. Maliciously crafted object names could present a SQL
injection risk when the script is reloaded. (CVE-2012-0868)
</P
></LI
><LI
><P
> Fix btree index corruption from insertions concurrent with vacuuming
(Tom Lane)
</P
><P
> An index page split caused by an insertion could sometimes cause a
concurrently-running <TT
CLASS="COMMAND"
>VACUUM</TT
> to miss removing index entries
that it should remove. After the corresponding table rows are removed,
the dangling index entries would cause errors (such as <SPAN
CLASS="QUOTE"
>"could not
read block N in file ..."</SPAN
>) or worse, silently wrong query results
after unrelated rows are re-inserted at the now-free table locations.
This bug has been present since release 8.2, but occurs so infrequently
that it was not diagnosed until now. If you have reason to suspect
that it has happened in your database, reindexing the affected index
will fix things.
</P
></LI
><LI
><P
> Fix transient zeroing of shared buffers during WAL replay (Tom Lane)
</P
><P
> The replay logic would sometimes zero and refill a shared buffer, so
that the contents were transiently invalid. In hot standby mode this
can result in a query that's executing in parallel seeing garbage data.
Various symptoms could result from that, but the most common one seems
to be <SPAN
CLASS="QUOTE"
>"invalid memory alloc request size"</SPAN
>.
</P
></LI
><LI
><P
> Fix handling of data-modifying <TT
CLASS="LITERAL"
>WITH</TT
> subplans in
<TT
CLASS="LITERAL"
>READ COMMITTED</TT
> rechecking (Tom Lane)
</P
><P
> A <TT
CLASS="LITERAL"
>WITH</TT
> clause containing
<TT
CLASS="COMMAND"
>INSERT</TT
>/<TT
CLASS="COMMAND"
>UPDATE</TT
>/<TT
CLASS="COMMAND"
>DELETE</TT
> would crash
if the parent <TT
CLASS="COMMAND"
>UPDATE</TT
> or <TT
CLASS="COMMAND"
>DELETE</TT
> command needed
to be re-evaluated at one or more rows due to concurrent updates
in <TT
CLASS="LITERAL"
>READ COMMITTED</TT
> mode.
</P
></LI
><LI
><P
> Fix corner case in SSI transaction cleanup
(Dan Ports)
</P
><P
> When finishing up a read-write serializable transaction,
a crash could occur if all remaining active serializable transactions
are read-only.
</P
></LI
><LI
><P
> Fix postmaster to attempt restart after a hot-standby crash (Tom Lane)
</P
><P
> A logic error caused the postmaster to terminate, rather than attempt
to restart the cluster, if any backend process crashed while operating
in hot standby mode.
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>CLUSTER</TT
>/<TT
CLASS="COMMAND"
>VACUUM FULL</TT
> handling of toast
values owned by recently-updated rows (Tom Lane)
</P
><P
> This oversight could lead to <SPAN
CLASS="QUOTE"
>"duplicate key value violates unique
constraint"</SPAN
> errors being reported against the toast table's index
during one of these commands.
</P
></LI
><LI
><P
> Update per-column permissions, not only per-table permissions, when
changing table owner (Tom Lane)
</P
><P
> Failure to do this meant that any previously granted column permissions
were still shown as having been granted by the old owner. This meant
that neither the new owner nor a superuser could revoke the
now-untraceable-to-table-owner permissions.
</P
></LI
><LI
><P
> Support foreign data wrappers and foreign servers in
<TT
CLASS="COMMAND"
>REASSIGN OWNED</TT
> (Alvaro Herrera)
</P
><P
> This command failed with <SPAN
CLASS="QUOTE"
>"unexpected classid"</SPAN
> errors if
it needed to change the ownership of any such objects.
</P
></LI
><LI
><P
> Allow non-existent values for some settings in <TT
CLASS="COMMAND"
>ALTER
USER/DATABASE SET</TT
> (Heikki Linnakangas)
</P
><P
> Allow <TT
CLASS="VARNAME"
>default_text_search_config</TT
>,
<TT
CLASS="VARNAME"
>default_tablespace</TT
>, and <TT
CLASS="VARNAME"
>temp_tablespaces</TT
> to be
set to names that are not known. This is because they might be known
in another database where the setting is intended to be used, or for the
tablespace cases because the tablespace might not be created yet. The
same issue was previously recognized for <TT
CLASS="VARNAME"
>search_path</TT
>, and
these settings now act like that one.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="QUOTE"
>"unsupported node type"</SPAN
> error caused by <TT
CLASS="LITERAL"
>COLLATE</TT
>
in an <TT
CLASS="COMMAND"
>INSERT</TT
> expression (Tom Lane)
</P
></LI
><LI
><P
> Avoid crashing when we have problems deleting table files post-commit
(Tom Lane)
</P
><P
> Dropping a table should lead to deleting the underlying disk files only
after the transaction commits. In event of failure then (for instance,
because of wrong file permissions) the code is supposed to just emit a
warning message and go on, since it's too late to abort the
transaction. This logic got broken as of release 8.4, causing such
situations to result in a PANIC and an unrestartable database.
</P
></LI
><LI
><P
> Recover from errors occurring during WAL replay of <TT
CLASS="COMMAND"
>DROP
TABLESPACE</TT
> (Tom Lane)
</P
><P
> Replay will attempt to remove the tablespace's directories, but there
are various reasons why this might fail (for example, incorrect
ownership or permissions on those directories). Formerly the replay
code would panic, rendering the database unrestartable without manual
intervention. It seems better to log the problem and continue, since
the only consequence of failure to remove the directories is some
wasted disk space.
</P
></LI
><LI
><P
> Fix race condition in logging AccessExclusiveLocks for hot standby
(Simon Riggs)
</P
><P
> Sometimes a lock would be logged as being held by <SPAN
CLASS="QUOTE"
>"transaction
zero"</SPAN
>. This is at least known to produce assertion failures on
slave servers, and might be the cause of more serious problems.
</P
></LI
><LI
><P
> Track the OID counter correctly during WAL replay, even when it wraps
around (Tom Lane)
</P
><P
> Previously the OID counter would remain stuck at a high value until the
system exited replay mode. The practical consequences of that are
usually nil, but there are scenarios wherein a standby server that's
been promoted to master might take a long time to advance the OID
counter to a reasonable value once values are needed.
</P
></LI
><LI
><P
> Prevent emitting misleading <SPAN
CLASS="QUOTE"
>"consistent recovery state reached"</SPAN
>
log message at the beginning of crash recovery (Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix initial value of
<TT
CLASS="STRUCTNAME"
>pg_stat_replication</TT
>.<TT
CLASS="STRUCTFIELD"
>replay_location</TT
>
(Fujii Masao)
</P
><P
> Previously, the value shown would be wrong until at least one WAL
record had been replayed.
</P
></LI
><LI
><P
> Fix regular expression back-references with <TT
CLASS="LITERAL"
>*</TT
> attached
(Tom Lane)
</P
><P
> Rather than enforcing an exact string match, the code would effectively
accept any string that satisfies the pattern sub-expression referenced
by the back-reference symbol.
</P
><P
> A similar problem still afflicts back-references that are embedded in a
larger quantified expression, rather than being the immediate subject
of the quantifier. This will be addressed in a future
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> release.
</P
></LI
><LI
><P
> Fix recently-introduced memory leak in processing of
<TT
CLASS="TYPE"
>inet</TT
>/<TT
CLASS="TYPE"
>cidr</TT
> values (Heikki Linnakangas)
</P
><P
> A patch in the December 2011 releases of <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
caused memory leakage in these operations, which could be significant
in scenarios such as building a btree index on such a column.
</P
></LI
><LI
><P
> Fix planner's ability to push down index-expression restrictions
through <TT
CLASS="LITERAL"
>UNION ALL</TT
> (Tom Lane)
</P
><P
> This type of optimization was inadvertently disabled by a fix for
another problem in 9.1.2.
</P
></LI
><LI
><P
> Fix planning of <TT
CLASS="LITERAL"
>WITH</TT
> clauses referenced in
<TT
CLASS="COMMAND"
>UPDATE</TT
>/<TT
CLASS="COMMAND"
>DELETE</TT
> on an inherited table
(Tom Lane)
</P
><P
> This bug led to <SPAN
CLASS="QUOTE"
>"could not find plan for CTE"</SPAN
> failures.
</P
></LI
><LI
><P
> Fix GIN cost estimation to handle <TT
CLASS="LITERAL"
>column IN (...)</TT
>
index conditions (Marti Raudsepp)
</P
><P
> This oversight would usually lead to crashes if such a condition could
be used with a GIN index.
</P
></LI
><LI
><P
> Prevent assertion failure when exiting a session with an open, failed
transaction (Tom Lane)
</P
><P
> This bug has no impact on normal builds with asserts not enabled.
</P
></LI
><LI
><P
> Fix dangling pointer after <TT
CLASS="COMMAND"
>CREATE TABLE AS</TT
>/<TT
CLASS="COMMAND"
>SELECT
INTO</TT
> in a SQL-language function (Tom Lane)
</P
><P
> In most cases this only led to an assertion failure in assert-enabled
builds, but worse consequences seem possible.
</P
></LI
><LI
><P
> Avoid double close of file handle in syslogger on Windows (MauMau)
</P
><P
> Ordinarily this error was invisible, but it would cause an exception
when running on a debug version of Windows.
</P
></LI
><LI
><P
> Fix I/O-conversion-related memory leaks in plpgsql
(Andres Freund, Jan Urbanski, Tom Lane)
</P
><P
> Certain operations would leak memory until the end of the current
function.
</P
></LI
><LI
><P
> Work around bug in perl's SvPVutf8() function (Andrew Dunstan)
</P
><P
> This function crashes when handed a typeglob or certain read-only
objects such as <TT
CLASS="LITERAL"
>$^V</TT
>. Make plperl avoid passing those to
it.
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>, don't dump contents of an extension's
configuration tables if the extension itself is not being dumped
(Tom Lane)
</P
></LI
><LI
><P
> Improve <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>'s handling of inherited table columns
(Tom Lane)
</P
><P
> <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> mishandled situations where a child column has
a different default expression than its parent column. If the default
is textually identical to the parent's default, but not actually the
same (for instance, because of schema search path differences) it would
not be recognized as different, so that after dump and restore the
child would be allowed to inherit the parent's default. Child columns
that are <TT
CLASS="LITERAL"
>NOT NULL</TT
> where their parent is not could also be
restored subtly incorrectly.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>'s direct-to-database mode for
INSERT-style table data (Tom Lane)
</P
><P
> Direct-to-database restores from archive files made with
<TT
CLASS="OPTION"
>--inserts</TT
> or <TT
CLASS="OPTION"
>--column-inserts</TT
> options fail when
using <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> from a release dated September or
December 2011, as a result of an oversight in a fix for another
problem. The archive file itself is not at fault, and text-mode
output is okay.
</P
></LI
><LI
><P
> Teach <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to handle renaming of
<SPAN
CLASS="APPLICATION"
>plpython</SPAN
>'s shared library (Bruce Momjian)
</P
><P
> Upgrading a pre-9.1 database that included plpython would fail because
of this oversight.
</P
></LI
><LI
><P
> Allow <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to process tables containing
<TT
CLASS="TYPE"
>regclass</TT
> columns (Bruce Momjian)
</P
><P
> Since <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> now takes care to preserve
<TT
CLASS="STRUCTNAME"
>pg_class</TT
> OIDs, there was no longer any reason for this
restriction.
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> ignore <TT
CLASS="LITERAL"
>ENOTDIR</TT
> errors
when looking for an SSL client certificate file
(Magnus Hagander)
</P
><P
> This allows SSL connections to be established, though without a
certificate, even when the user's home directory is set to something
like <TT
CLASS="LITERAL"
>/dev/null</TT
>.
</P
></LI
><LI
><P
> Fix some more field alignment issues in <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>'s SQLDA area
(Zoltan Boszormenyi)
</P
></LI
><LI
><P
> Allow <TT
CLASS="LITERAL"
>AT</TT
> option in <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>
<TT
CLASS="LITERAL"
>DEALLOCATE</TT
> statements (Michael Meskes)
</P
><P
> The infrastructure to support this has been there for awhile, but
through an oversight there was still an error check rejecting the case.
</P
></LI
><LI
><P
> Do not use the variable name when defining a varchar structure in ecpg
(Michael Meskes)
</P
></LI
><LI
><P
> Fix <TT
CLASS="FILENAME"
>contrib/auto_explain</TT
>'s JSON output mode to produce
valid JSON (Andrew Dunstan)
</P
><P
> The output used brackets at the top level, when it should have used
braces.
</P
></LI
><LI
><P
> Fix error in <TT
CLASS="FILENAME"
>contrib/intarray</TT
>'s <TT
CLASS="LITERAL"
>int[] &
int[]</TT
> operator (Guillaume Lelarge)
</P
><P
> If the smallest integer the two input arrays have in common is 1,
and there are smaller values in either array, then 1 would be
incorrectly omitted from the result.
</P
></LI
><LI
><P
> Fix error detection in <TT
CLASS="FILENAME"
>contrib/pgcrypto</TT
>'s
<CODE
CLASS="FUNCTION"
>encrypt_iv()</CODE
> and <CODE
CLASS="FUNCTION"
>decrypt_iv()</CODE
>
(Marko Kreen)
</P
><P
> These functions failed to report certain types of invalid-input errors,
and would instead return random garbage values for incorrect input.
</P
></LI
><LI
><P
> Fix one-byte buffer overrun in <TT
CLASS="FILENAME"
>contrib/test_parser</TT
>
(Paul Guyot)
</P
><P
> The code would try to read one more byte than it should, which would
crash in corner cases.
Since <TT
CLASS="FILENAME"
>contrib/test_parser</TT
> is only example code, this is
not a security issue in itself, but bad example code is still bad.
</P
></LI
><LI
><P
> Use <CODE
CLASS="FUNCTION"
>__sync_lock_test_and_set()</CODE
> for spinlocks on ARM, if
available (Martin Pitt)
</P
><P
> This function replaces our previous use of the <TT
CLASS="LITERAL"
>SWPB</TT
>
instruction, which is deprecated and not available on ARMv6 and later.
Reports suggest that the old code doesn't fail in an obvious way on
recent ARM boards, but simply doesn't interlock concurrent accesses,
leading to bizarre failures in multiprocess operation.
</P
></LI
><LI
><P
> Use <TT
CLASS="OPTION"
>-fexcess-precision=standard</TT
> option when building with
gcc versions that accept it (Andrew Dunstan)
</P
><P
> This prevents assorted scenarios wherein recent versions of gcc will
produce creative results.
</P
></LI
><LI
><P
> Allow use of threaded Python on FreeBSD (Chris Rees)
</P
><P
> Our configure script previously believed that this combination wouldn't
work; but FreeBSD fixed the problem, so remove that error check.
</P
></LI
><LI
><P
> Allow MinGW builds to use standardly-named OpenSSL libraries
(Tomasz Ostrowski)
</P
></LI
></UL
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