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release-8.1.sgml
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<!-- doc/src/sgml/release-8.1.sgml -->
<!-- See header comment in release.sgml about typical markup -->
<sect1 id="release-8-1-23">
<title>Release 8.1.23</title>
<note>
<title>Release date</title>
<simpara>2010-12-16</simpara>
</note>
<para>
This release contains a variety of fixes from 8.1.22.
For information about new features in the 8.1 major release, see
<xref linkend="release-8-1">.
</para>
<para>
This is expected to be the last <productname>PostgreSQL</> release
in the 8.1.X series. Users are encouraged to update to a newer
release branch soon.
</para>
<sect2>
<title>Migration to Version 8.1.23</title>
<para>
A dump/restore is not required for those running 8.1.X.
However, if you are upgrading from a version earlier than 8.1.18,
see the release notes for 8.1.18.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Force the default
<link linkend="guc-wal-sync-method"><varname>wal_sync_method</></link>
to be <literal>fdatasync</> on Linux (Tom Lane, Marti Raudsepp)
</para>
<para>
The default on Linux has actually been <literal>fdatasync</> for many
years, but recent kernel changes caused <productname>PostgreSQL</> to
choose <literal>open_datasync</> instead. This choice did not result
in any performance improvement, and caused outright failures on
certain filesystems, notably <literal>ext4</> with the
<literal>data=journal</> mount option.
</para>
</listitem>
<listitem>
<para>
Fix recovery from base backup when the starting checkpoint WAL record
is not in the same WAL segment as its redo point (Jeff Davis)
</para>
</listitem>
<listitem>
<para>
Add support for detecting register-stack overrun on <literal>IA64</>
(Tom Lane)
</para>
<para>
The <literal>IA64</> architecture has two hardware stacks. Full
prevention of stack-overrun failures requires checking both.
</para>
</listitem>
<listitem>
<para>
Add a check for stack overflow in <function>copyObject()</> (Tom Lane)
</para>
<para>
Certain code paths could crash due to stack overflow given a
sufficiently complex query.
</para>
</listitem>
<listitem>
<para>
Fix detection of page splits in temporary GiST indexes (Heikki
Linnakangas)
</para>
<para>
It is possible to have a <quote>concurrent</> page split in a
temporary index, if for example there is an open cursor scanning the
index when an insertion is done. GiST failed to detect this case and
hence could deliver wrong results when execution of the cursor
continued.
</para>
</listitem>
<listitem>
<para>
Avoid memory leakage while <command>ANALYZE</>'ing complex index
expressions (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Ensure an index that uses a whole-row Var still depends on its table
(Tom Lane)
</para>
<para>
An index declared like <literal>create index i on t (foo(t.*))</>
would not automatically get dropped when its table was dropped.
</para>
</listitem>
<listitem>
<para>
Do not <quote>inline</> a SQL function with multiple <literal>OUT</>
parameters (Tom Lane)
</para>
<para>
This avoids a possible crash due to loss of information about the
expected result rowtype.
</para>
</listitem>
<listitem>
<para>
Fix constant-folding of <literal>COALESCE()</> expressions (Tom Lane)
</para>
<para>
The planner would sometimes attempt to evaluate sub-expressions that
in fact could never be reached, possibly leading to unexpected errors.
</para>
</listitem>
<listitem>
<para>
Add print functionality for <structname>InhRelation</> nodes (Tom Lane)
</para>
<para>
This avoids a failure when <varname>debug_print_parse</> is enabled
and certain types of query are executed.
</para>
</listitem>
<listitem>
<para>
Fix incorrect calculation of distance from a point to a horizontal
line segment (Tom Lane)
</para>
<para>
This bug affected several different geometric distance-measurement
operators.
</para>
</listitem>
<listitem>
<para>
Fix <application>PL/pgSQL</>'s handling of <quote>simple</>
expressions to not fail in recursion or error-recovery cases (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix bug in <filename>contrib/cube</>'s GiST picksplit algorithm
(Alexander Korotkov)
</para>
<para>
This could result in considerable inefficiency, though not actually
incorrect answers, in a GiST index on a <type>cube</> column.
If you have such an index, consider <command>REINDEX</>ing it after
installing this update.
</para>
</listitem>
<listitem>
<para>
Don't emit <quote>identifier will be truncated</> notices in
<filename>contrib/dblink</> except when creating new connections
(Itagaki Takahiro)
</para>
</listitem>
<listitem>
<para>
Fix potential coredump on missing public key in
<filename>contrib/pgcrypto</> (Marti Raudsepp)
</para>
</listitem>
<listitem>
<para>
Fix memory leak in <filename>contrib/xml2</>'s XPath query functions
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2010o
for DST law changes in Fiji and Samoa;
also historical corrections for Hong Kong.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-8-1-22">
<title>Release 8.1.22</title>
<note>
<title>Release date</title>
<simpara>2010-10-04</simpara>
</note>
<para>
This release contains a variety of fixes from 8.1.21.
For information about new features in the 8.1 major release, see
<xref linkend="release-8-1">.
</para>
<para>
The <productname>PostgreSQL</> community will stop releasing updates
for the 8.1.X release series in November 2010.
Users are encouraged to update to a newer release branch soon.
</para>
<sect2>
<title>Migration to Version 8.1.22</title>
<para>
A dump/restore is not required for those running 8.1.X.
However, if you are upgrading from a version earlier than 8.1.18,
see the release notes for 8.1.18.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Use a separate interpreter for each calling SQL userid in PL/Perl and
PL/Tcl (Tom Lane)
</para>
<para>
This change prevents security problems that can be caused by subverting
Perl or Tcl code that will be executed later in the same session under
another SQL user identity (for example, within a <literal>SECURITY
DEFINER</> function). Most scripting languages offer numerous ways that
that might be done, such as redefining standard functions or operators
called by the target function. Without this change, any SQL user with
Perl or Tcl language usage rights can do essentially anything with the
SQL privileges of the target function's owner.
</para>
<para>
The cost of this change is that intentional communication among Perl
and Tcl functions becomes more difficult. To provide an escape hatch,
PL/PerlU and PL/TclU functions continue to use only one interpreter
per session. This is not considered a security issue since all such
functions execute at the trust level of a database superuser already.
</para>
<para>
It is likely that third-party procedural languages that claim to offer
trusted execution have similar security issues. We advise contacting
the authors of any PL you are depending on for security-critical
purposes.
</para>
<para>
Our thanks to Tim Bunce for pointing out this issue (CVE-2010-3433).
</para>
</listitem>
<listitem>
<para>
Prevent possible crashes in <function>pg_get_expr()</> by disallowing
it from being called with an argument that is not one of the system
catalog columns it's intended to be used with
(Heikki Linnakangas, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix <quote>cannot handle unplanned sub-select</quote> error (Tom Lane)
</para>
<para>
This occurred when a sub-select contains a join alias reference that
expands into an expression containing another sub-select.
</para>
</listitem>
<listitem>
<para>
Prevent show_session_authorization() from crashing within autovacuum
processes (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Defend against functions returning setof record where not all the
returned rows are actually of the same rowtype (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix possible failure when hashing a pass-by-reference function result
(Tao Ma, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Take care to fsync the contents of lockfiles (both
<filename>postmaster.pid</> and the socket lockfile) while writing them
(Tom Lane)
</para>
<para>
This omission could result in corrupted lockfile contents if the
machine crashes shortly after postmaster start. That could in turn
prevent subsequent attempts to start the postmaster from succeeding,
until the lockfile is manually removed.
</para>
</listitem>
<listitem>
<para>
Avoid recursion while assigning XIDs to heavily-nested
subtransactions (Andres Freund, Robert Haas)
</para>
<para>
The original coding could result in a crash if there was limited
stack space.
</para>
</listitem>
<listitem>
<para>
Fix <varname>log_line_prefix</>'s <literal>%i</> escape,
which could produce junk early in backend startup (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix possible data corruption in <command>ALTER TABLE ... SET
TABLESPACE</> when archiving is enabled (Jeff Davis)
</para>
</listitem>
<listitem>
<para>
Allow <command>CREATE DATABASE</> and <command>ALTER DATABASE ... SET
TABLESPACE</> to be interrupted by query-cancel (Guillaume Lelarge)
</para>
</listitem>
<listitem>
<para>
In PL/Python, defend against null pointer results from
<function>PyCObject_AsVoidPtr</> and <function>PyCObject_FromVoidPtr</>
(Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Improve <filename>contrib/dblink</>'s handling of tables containing
dropped columns (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix connection leak after <quote>duplicate connection name</quote>
errors in <filename>contrib/dblink</> (Itagaki Takahiro)
</para>
</listitem>
<listitem>
<para>
Fix <filename>contrib/dblink</> to handle connection names longer than
62 bytes correctly (Itagaki Takahiro)
</para>
</listitem>
<listitem>
<para>
Update build infrastructure and documentation to reflect the source code
repository's move from CVS to Git (Magnus Hagander and others)
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2010l
for DST law changes in Egypt and Palestine; also historical corrections
for Finland.
</para>
<para>
This change also adds new names for two Micronesian timezones:
Pacific/Chuuk is now preferred over Pacific/Truk (and the preferred
abbreviation is CHUT not TRUT) and Pacific/Pohnpei is preferred over
Pacific/Ponape.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-8-1-21">
<title>Release 8.1.21</title>
<note>
<title>Release date</title>
<simpara>2010-05-17</simpara>
</note>
<para>
This release contains a variety of fixes from 8.1.20.
For information about new features in the 8.1 major release, see
<xref linkend="release-8-1">.
</para>
<sect2>
<title>Migration to Version 8.1.21</title>
<para>
A dump/restore is not required for those running 8.1.X.
However, if you are upgrading from a version earlier than 8.1.18,
see the release notes for 8.1.18.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Enforce restrictions in <literal>plperl</> using an opmask applied to
the whole interpreter, instead of using <filename>Safe.pm</>
(Tim Bunce, Andrew Dunstan)
</para>
<para>
Recent developments have convinced us that <filename>Safe.pm</> is too
insecure to rely on for making <literal>plperl</> trustable. This
change removes use of <filename>Safe.pm</> altogether, in favor of using
a separate interpreter with an opcode mask that is always applied.
Pleasant side effects of the change include that it is now possible to
use Perl's <literal>strict</> pragma in a natural way in
<literal>plperl</>, and that Perl's <literal>$a</> and <literal>$b</>
variables work as expected in sort routines, and that function
compilation is significantly faster. (CVE-2010-1169)
</para>
</listitem>
<listitem>
<para>
Prevent PL/Tcl from executing untrustworthy code from
<structname>pltcl_modules</> (Tom)
</para>
<para>
PL/Tcl's feature for autoloading Tcl code from a database table
could be exploited for trojan-horse attacks, because there was no
restriction on who could create or insert into that table. This change
disables the feature unless <structname>pltcl_modules</> is owned by a
superuser. (However, the permissions on the table are not checked, so
installations that really need a less-than-secure modules table can
still grant suitable privileges to trusted non-superusers.) Also,
prevent loading code into the unrestricted <quote>normal</> Tcl
interpreter unless we are really going to execute a <literal>pltclu</>
function. (CVE-2010-1170)
</para>
</listitem>
<listitem>
<para>
Do not allow an unprivileged user to reset superuser-only parameter
settings (Alvaro)
</para>
<para>
Previously, if an unprivileged user ran <literal>ALTER USER ... RESET
ALL</> for himself, or <literal>ALTER DATABASE ... RESET ALL</> for
a database he owns, this would remove all special parameter settings
for the user or database, even ones that are only supposed to be
changeable by a superuser. Now, the <command>ALTER</> will only
remove the parameters that the user has permission to change.
</para>
</listitem>
<listitem>
<para>
Avoid possible crash during backend shutdown if shutdown occurs
when a <literal>CONTEXT</> addition would be made to log entries (Tom)
</para>
<para>
In some cases the context-printing function would fail because the
current transaction had already been rolled back when it came time
to print a log message.
</para>
</listitem>
<listitem>
<para>
Update pl/perl's <filename>ppport.h</> for modern Perl versions
(Andrew)
</para>
</listitem>
<listitem>
<para>
Fix assorted memory leaks in pl/python (Andreas Freund, Tom)
</para>
</listitem>
<listitem>
<para>
Prevent infinite recursion in <application>psql</> when expanding
a variable that refers to itself (Tom)
</para>
</listitem>
<listitem>
<para>
Ensure that <filename>contrib/pgstattuple</> functions respond to cancel
interrupts promptly (Tatsuhito Kasahara)
</para>
</listitem>
<listitem>
<para>
Make server startup deal properly with the case that
<function>shmget()</> returns <literal>EINVAL</> for an existing
shared memory segment (Tom)
</para>
<para>
This behavior has been observed on BSD-derived kernels including OS X.
It resulted in an entirely-misleading startup failure complaining that
the shared memory request size was too large.
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2010j
for DST law changes in Argentina, Australian Antarctic, Bangladesh,
Mexico, Morocco, Pakistan, Palestine, Russia, Syria, Tunisia;
also historical corrections for Taiwan.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-8-1-20">
<title>Release 8.1.20</title>
<note>
<title>Release date</title>
<simpara>2010-03-15</simpara>
</note>
<para>
This release contains a variety of fixes from 8.1.19.
For information about new features in the 8.1 major release, see
<xref linkend="release-8-1">.
</para>
<sect2>
<title>Migration to Version 8.1.20</title>
<para>
A dump/restore is not required for those running 8.1.X.
However, if you are upgrading from a version earlier than 8.1.18,
see the release notes for 8.1.18.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Add new configuration parameter <varname>ssl_renegotiation_limit</> to
control how often we do session key renegotiation for an SSL connection
(Magnus)
</para>
<para>
This can be set to zero to disable renegotiation completely, which may
be required if a broken SSL library is used. In particular, some
vendors are shipping stopgap patches for CVE-2009-3555 that cause
renegotiation attempts to fail.
</para>
</listitem>
<listitem>
<para>
Fix possible crashes when trying to recover from a failure in
subtransaction start (Tom)
</para>
</listitem>
<listitem>
<para>
Fix server memory leak associated with use of savepoints and a client
encoding different from server's encoding (Tom)
</para>
</listitem>
<listitem>
<para>
Make <function>substring()</> for <type>bit</> types treat any negative
length as meaning <quote>all the rest of the string</> (Tom)
</para>
<para>
The previous coding treated only -1 that way, and would produce an
invalid result value for other negative values, possibly leading to
a crash (CVE-2010-0442).
</para>
</listitem>
<listitem>
<para>
Fix integer-to-bit-string conversions to handle the first fractional
byte correctly when the output bit width is wider than the given
integer by something other than a multiple of 8 bits (Tom)
</para>
</listitem>
<listitem>
<para>
Fix some cases of pathologically slow regular expression matching (Tom)
</para>
</listitem>
<listitem>
<para>
Fix the <literal>STOP WAL LOCATION</> entry in backup history files to
report the next WAL segment's name when the end location is exactly at a
segment boundary (Itagaki Takahiro)
</para>
</listitem>
<listitem>
<para>
Fix some more cases of temporary-file leakage (Heikki)
</para>
<para>
This corrects a problem introduced in the previous minor release.
One case that failed is when a plpgsql function returning set is
called within another function's exception handler.
</para>
</listitem>
<listitem>
<para>
When reading <filename>pg_hba.conf</> and related files, do not treat
<literal>@something</> as a file inclusion request if the <literal>@</>
appears inside quote marks; also, never treat <literal>@</> by itself
as a file inclusion request (Tom)
</para>
<para>
This prevents erratic behavior if a role or database name starts with
<literal>@</>. If you need to include a file whose path name
contains spaces, you can still do so, but you must write
<literal>@"/path to/file"</> rather than putting the quotes around
the whole construct.
</para>
</listitem>
<listitem>
<para>
Prevent infinite loop on some platforms if a directory is named as
an inclusion target in <filename>pg_hba.conf</> and related files
(Tom)
</para>
</listitem>
<listitem>
<para>
Fix <application>psql</>'s <literal>numericlocale</> option to not
format strings it shouldn't in latex and troff output formats (Heikki)
</para>
</listitem>
<listitem>
<para>
Fix plpgsql failure in one case where a composite column is set to NULL
(Tom)
</para>
</listitem>
<listitem>
<para>
Add <literal>volatile</> markings in PL/Python to avoid possible
compiler-specific misbehavior (Zdenek Kotala)
</para>
</listitem>
<listitem>
<para>
Ensure PL/Tcl initializes the Tcl interpreter fully (Tom)
</para>
<para>
The only known symptom of this oversight is that the Tcl
<literal>clock</> command misbehaves if using Tcl 8.5 or later.
</para>
</listitem>
<listitem>
<para>
Prevent crash in <filename>contrib/dblink</> when too many key
columns are specified to a <function>dblink_build_sql_*</> function
(Rushabh Lathia, Joe Conway)
</para>
</listitem>
<listitem>
<para>
Fix assorted crashes in <filename>contrib/xml2</> caused by sloppy
memory management (Tom)
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2010e
for DST law changes in Bangladesh, Chile, Fiji, Mexico, Paraguay, Samoa.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-8-1-19">
<title>Release 8.1.19</title>
<note>
<title>Release date</title>
<simpara>2009-12-14</simpara>
</note>
<para>
This release contains a variety of fixes from 8.1.18.
For information about new features in the 8.1 major release, see
<xref linkend="release-8-1">.
</para>
<sect2>
<title>Migration to Version 8.1.19</title>
<para>
A dump/restore is not required for those running 8.1.X.
However, if you are upgrading from a version earlier than 8.1.18,
see the release notes for 8.1.18.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Protect against indirect security threats caused by index functions
changing session-local state (Gurjeet Singh, Tom)
</para>
<para>
This change prevents allegedly-immutable index functions from possibly
subverting a superuser's session (CVE-2009-4136).
</para>
</listitem>
<listitem>
<para>
Reject SSL certificates containing an embedded null byte in the common
name (CN) field (Magnus)
</para>
<para>
This prevents unintended matching of a certificate to a server or client
name during SSL validation (CVE-2009-4034).
</para>
</listitem>
<listitem>
<para>
Fix possible crash during backend-startup-time cache initialization (Tom)
</para>
</listitem>
<listitem>
<para>
Prevent signals from interrupting <literal>VACUUM</> at unsafe times
(Alvaro)
</para>
<para>
This fix prevents a PANIC if a <literal>VACUUM FULL</> is cancelled
after it's already committed its tuple movements, as well as transient
errors if a plain <literal>VACUUM</> is interrupted after having
truncated the table.
</para>
</listitem>
<listitem>
<para>
Fix possible crash due to integer overflow in hash table size
calculation (Tom)
</para>
<para>
This could occur with extremely large planner estimates for the size of
a hashjoin's result.
</para>
</listitem>
<listitem>
<para>
Fix very rare crash in <type>inet</>/<type>cidr</> comparisons (Chris
Mikkelson)
</para>
</listitem>
<listitem>
<para>
Ensure that shared tuple-level locks held by prepared transactions are
not ignored (Heikki)
</para>
</listitem>
<listitem>
<para>
Fix premature drop of temporary files used for a cursor that is accessed
within a subtransaction (Heikki)
</para>
</listitem>
<listitem>
<para>
Fix PAM password processing to be more robust (Tom)
</para>
<para>
The previous code is known to fail with the combination of the Linux
<literal>pam_krb5</> PAM module with Microsoft Active Directory as the
domain controller. It might have problems elsewhere too, since it was
making unjustified assumptions about what arguments the PAM stack would
pass to it.
</para>
</listitem>
<listitem>
<para>
Fix processing of ownership dependencies during <literal>CREATE OR
REPLACE FUNCTION</> (Tom)
</para>
</listitem>
<listitem>
<para>
Ensure that Perl arrays are properly converted to
<productname>PostgreSQL</> arrays when returned by a set-returning
PL/Perl function (Andrew Dunstan, Abhijit Menon-Sen)
</para>
<para>
This worked correctly already for non-set-returning functions.
</para>
</listitem>
<listitem>
<para>
Fix rare crash in exception processing in PL/Python (Peter)
</para>
</listitem>
<listitem>
<para>
Ensure <application>psql</>'s flex module is compiled with the correct
system header definitions (Tom)
</para>
<para>
This fixes build failures on platforms where
<literal>--enable-largefile</> causes incompatible changes in the
generated code.
</para>
</listitem>
<listitem>
<para>
Make the postmaster ignore any <literal>application_name</> parameter in
connection request packets, to improve compatibility with future libpq
versions (Tom)
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2009s
for DST law changes in Antarctica, Argentina, Bangladesh, Fiji,
Novokuznetsk, Pakistan, Palestine, Samoa, Syria; also historical
corrections for Hong Kong.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-8-1-18">
<title>Release 8.1.18</title>
<note>
<title>Release date</title>
<simpara>2009-09-09</simpara>
</note>
<para>
This release contains a variety of fixes from 8.1.17.
For information about new features in the 8.1 major release, see
<xref linkend="release-8-1">.
</para>
<sect2>
<title>Migration to Version 8.1.18</title>
<para>
A dump/restore is not required for those running 8.1.X.
However, if you have any hash indexes on <type>interval</> columns,
you must <command>REINDEX</> them after updating to 8.1.18.
Also, if you are upgrading from a version earlier than 8.1.15,
see the release notes for 8.1.15.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Disallow <command>RESET ROLE</> and <command>RESET SESSION