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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>E.2. Release 15.5</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="release-15-6.html" title="E.1. Release 15.6" /><link rel="next" href="release-15-4.html" title="E.3. Release 15.4" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">E.2. Release 15.5</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="release-15-6.html" title="E.1. Release 15.6">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="release.html" title="Appendix E. Release Notes">Up</a></td><th width="60%" align="center">Appendix E. Release Notes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="release-15-4.html" title="E.3. Release 15.4">Next</a></td></tr></table><hr /></div><div class="sect1" id="RELEASE-15-5"><div class="titlepage"><div><div><h2 class="title" style="clear: both">E.2. Release 15.5</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="release-15-5.html#id-1.11.6.6.4">E.2.1. Migration to Version 15.5</a></span></dt><dt><span class="sect2"><a href="release-15-5.html#id-1.11.6.6.5">E.2.2. Changes</a></span></dt></dl></div><p><strong>Release date: </strong>2023-11-09</p><p>
This release contains a variety of fixes from 15.4.
For information about new features in major release 15, see
<a class="xref" href="release-15.html" title="E.7. Release 15">Section E.7</a>.
</p><div class="sect2" id="id-1.11.6.6.4"><div class="titlepage"><div><div><h3 class="title">E.2.1. Migration to Version 15.5</h3></div></div></div><p>
A dump/restore is not required for those running 15.X.
</p><p>
However, several mistakes have been discovered that could lead to
certain types of indexes yielding wrong search results or being
unnecessarily inefficient. It is advisable
to <code class="command">REINDEX</code> potentially-affected indexes after
installing this update. See the fourth through seventh changelog
entries below.
</p><p>
Also, if you are upgrading from a version earlier than 15.4,
see <a class="xref" href="release-15-4.html" title="E.3. Release 15.4">Section E.3</a>.
</p></div><div class="sect2" id="id-1.11.6.6.5"><div class="titlepage"><div><div><h3 class="title">E.2.2. Changes</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
Fix handling of unknown-type arguments
in <code class="literal">DISTINCT</code> <code class="type">"any"</code> aggregate
functions (Tom Lane)
</p><p>
This error led to a <code class="type">text</code>-type value being interpreted
as an <code class="type">unknown</code>-type value (that is, a zero-terminated
string) at runtime. This could result in disclosure of server
memory following the <code class="type">text</code> value.
</p><p>
The <span class="productname">PostgreSQL</span> Project thanks Jingzhou Fu
for reporting this problem.
(CVE-2023-5868)
</p></li><li class="listitem"><p>
Detect integer overflow while computing new array dimensions
(Tom Lane)
</p><p>
When assigning new elements to array subscripts that are outside the
current array bounds, an undetected integer overflow could occur in
edge cases. Memory stomps that are potentially exploitable for
arbitrary code execution are possible, and so is disclosure of
server memory.
</p><p>
The <span class="productname">PostgreSQL</span> Project thanks Pedro
Gallegos for reporting this problem.
(CVE-2023-5869)
</p></li><li class="listitem"><p>
Prevent the <code class="literal">pg_signal_backend</code> role from
signalling background workers and autovacuum processes
(Noah Misch, Jelte Fennema-Nio)
</p><p>
The documentation says that <code class="literal">pg_signal_backend</code>
cannot issue signals to superuser-owned processes. It was able to
signal these background processes, though, because they advertise a
role OID of zero. Treat that as indicating superuser ownership.
The security implications of cancelling one of these process types
are fairly small so far as the core code goes (we'll just start
another one), but extensions might add background workers that are
more vulnerable.
</p><p>
Also ensure that the <code class="varname">is_superuser</code> parameter is
set correctly in such processes. No specific security consequences
are known for that oversight, but it might be significant for some
extensions.
</p><p>
The <span class="productname">PostgreSQL</span> Project thanks
Hemanth Sandrana and Mahendrakar Srinivasarao
for reporting this problem.
(CVE-2023-5870)
</p></li><li class="listitem"><p>
Fix misbehavior during recursive page split in GiST index build
(Heikki Linnakangas)
</p><p>
Fix a case where the location of a page downlink was incorrectly
tracked, and introduce some logic to allow recovering from such
situations rather than silently doing the wrong thing. This error
could result in incorrect answers from subsequent index searches.
It may be advisable to reindex all GiST indexes after installing
this update.
</p></li><li class="listitem"><p>
Prevent de-duplication of btree index entries
for <code class="type">interval</code> columns (Noah Misch)
</p><p>
There are <code class="type">interval</code> values that are distinguishable but
compare equal, for example <code class="literal">24:00:00</code>
and <code class="literal">1 day</code>. This breaks assumptions made by btree
de-duplication, so <code class="type">interval</code> columns need to be excluded
from de-duplication. This oversight can cause incorrect results
from index-only scans. Moreover, after
updating <span class="application">amcheck</span> will report an error for
almost all such indexes. Users should reindex any btree indexes
on <code class="type">interval</code> columns.
</p></li><li class="listitem"><p>
Process <code class="type">date</code> values more sanely in
BRIN <code class="literal">datetime_minmax_multi_ops</code> indexes
(Tomas Vondra)
</p><p>
The distance calculation for dates was backward, causing poor
decisions about which entries to merge. The index still produces
correct results, but is much less efficient than it should be.
Reindexing BRIN <code class="literal">minmax_multi</code> indexes
on <code class="type">date</code> columns is advisable.
</p></li><li class="listitem"><p>
Process large <code class="type">timestamp</code> and <code class="type">timestamptz</code>
values more sanely in
BRIN <code class="literal">datetime_minmax_multi_ops</code> indexes
(Tomas Vondra)
</p><p>
Infinities were mistakenly treated as having distance zero rather
than a large distance from other values, causing poor decisions
about which entries to merge. Also, finite-but-very-large values
(near the endpoints of the representable timestamp range) could
result in internal overflows, again causing poor decisions. The
index still produces correct results, but is much less efficient
than it should be. Reindexing BRIN <code class="literal">minmax_multi</code>
indexes on <code class="type">timestamp</code> and <code class="type">timestamptz</code>
columns is advisable if the column contains, or has contained,
infinities or large finite values.
</p></li><li class="listitem"><p>
Avoid calculation overflows in
BRIN <code class="literal">interval_minmax_multi_ops</code> indexes with
extreme interval values (Tomas Vondra)
</p><p>
This bug might have caused unexpected failures while trying to
insert large interval values into such an index.
</p></li><li class="listitem"><p>
Fix partition step generation and runtime partition pruning for
hash-partitioned tables with multiple partition keys (David Rowley)
</p><p>
Some cases involving an <code class="literal">IS NULL</code> condition on one
of the partition keys could result in a crash.
</p></li><li class="listitem"><p>
Fix inconsistent rechecking of concurrently-updated rows
during <code class="command">MERGE</code> (Dean Rasheed)
</p><p>
In <code class="literal">READ COMMITTED</code> mode, an update that finds that
its target row was just updated by a concurrent transaction will
recheck the query's <code class="literal">WHERE</code> conditions on the
updated row. <code class="command">MERGE</code> failed to ensure that the
proper rows of other joined tables were used during this recheck,
possibly resulting in incorrect decisions about whether the
newly-updated row should be updated again
by <code class="command">MERGE</code>.
</p></li><li class="listitem"><p>
Correctly identify the target table in an
inherited <code class="command">UPDATE</code>/<code class="command">DELETE</code>/<code class="command">MERGE</code>
even when the parent table is excluded by constraints (Amit Langote,
Tom Lane)
</p><p>
If the initially-named table is excluded by constraints, but not all
its inheritance descendants are, the first non-excluded descendant
was identified as the primary target table. This would lead to
firing statement-level triggers associated with that table, rather
than the initially-named table as should happen. In v16, the same
oversight could also lead to <span class="quote">“<span class="quote">invalid perminfoindex 0 in RTE
with relid NNNN</span>”</span> errors.
</p></li><li class="listitem"><p>
Fix edge case in btree mark/restore processing of ScalarArrayOpExpr
clauses (Peter Geoghegan)
</p><p>
When restoring an indexscan to a previously marked position, the
code could miss required setup steps if the scan had advanced
exactly to the end of the matches for a ScalarArrayOpExpr (that is,
an <code class="literal">indexcol = ANY(ARRAY[])</code>) clause. This could
result in missing some rows that should have been fetched.
</p></li><li class="listitem"><p>
Fix intra-query memory leak in Memoize execution
(Orlov Aleksej, David Rowley)
</p></li><li class="listitem"><p>
Fix intra-query memory leak when a set-returning function repeatedly
returns zero rows (Tom Lane)
</p></li><li class="listitem"><p>
Don't crash if <code class="function">cursor_to_xmlschema()</code> is applied
to a non-data-returning Portal (Boyu Yang)
</p></li><li class="listitem"><p>
Throw the intended error if <code class="function">pgrowlocks()</code> is
applied to a partitioned table (David Rowley)
</p><p>
Previously, a not-on-point complaint <span class="quote">“<span class="quote">only heap AM is
supported</span>”</span> would be raised.
</p></li><li class="listitem"><p>
Handle invalid indexes more cleanly in assorted SQL functions
(Noah Misch)
</p><p>
Report an error if <code class="function">pgstatindex()</code>,
<code class="function">pgstatginindex()</code>,
<code class="function">pgstathashindex()</code>,
or <code class="function">pgstattuple()</code> is applied to an invalid
index. If <code class="function">brin_desummarize_range()</code>,
<code class="function">brin_summarize_new_values()</code>,
<code class="function">brin_summarize_range()</code>,
or <code class="function">gin_clean_pending_list()</code> is applied to an
invalid index, do nothing except to report a debug-level message.
Formerly these functions attempted to process the index, and might
fail in strange ways depending on what the failed <code class="command">CREATE
INDEX</code> had left behind.
</p></li><li class="listitem"><p>
Fix <code class="function">pg_stat_reset_single_table_counters()</code> to do
the right thing for a shared catalog (Masahiro Ikeda)
</p><p>
Previously the reset would be ineffective.
</p></li><li class="listitem"><p>
Avoid premature memory allocation failure with long inputs
to <code class="function">to_tsvector()</code> (Tom Lane)
</p></li><li class="listitem"><p>
Fix over-allocation of the constructed <code class="type">tsvector</code>
in <code class="function">tsvectorrecv()</code> (Denis Erokhin)
</p><p>
If the incoming vector includes position data, the binary receive
function left wasted space (roughly equal to the size of the
position data) in the finished <code class="type">tsvector</code>. In extreme
cases this could lead to <span class="quote">“<span class="quote">maximum total lexeme length
exceeded</span>”</span> failures for vectors that were under the length
limit when emitted. In any case it could lead to wasted space
on-disk.
</p></li><li class="listitem"><p>
Fix incorrect coding in <code class="function">gtsvector_picksplit()</code>
(Alexander Lakhin)
</p><p>
This could lead to poor page-split decisions in GiST indexes
on <code class="type">tsvector</code> columns.
</p></li><li class="listitem"><p>
Improve checks for corrupt PGLZ compressed data (Flavien Guedez)
</p></li><li class="listitem"><p>
In <code class="command">COPY FROM</code>, fail cleanly when an unsupported
encoding conversion is needed (Tom Lane)
</p><p>
Recent refactoring accidentally removed the intended error check for
this, such that it ended in <span class="quote">“<span class="quote">cache lookup failed for function
0</span>”</span> instead of a useful error message.
</p></li><li class="listitem"><p>
Avoid crash in <code class="command">EXPLAIN</code> if a parameter marked to
be displayed by <code class="command">EXPLAIN</code> has a NULL boot-time
value (Xing Guo, Aleksander Alekseev, Tom Lane)
</p><p>
No built-in parameter fits this description, but an extension could
define such a parameter.
</p></li><li class="listitem"><p>
Ensure we have a snapshot while dropping <code class="literal">ON COMMIT
DROP</code> temp tables (Tom Lane)
</p><p>
This prevents possible misbehavior if any catalog entries for the
temp tables have fields wide enough to require toasting (such as a
very complex <code class="literal">CHECK</code> condition).
</p></li><li class="listitem"><p>
Avoid improper response to shutdown signals in child processes
just forked by <code class="function">system()</code> (Nathan Bossart)
</p><p>
This fix avoids a race condition in which a child process that has
been forked off by <code class="function">system()</code>, but hasn't yet
exec'd the intended child program, might receive and act on a signal
intended for the parent server process. That would lead to
duplicate cleanup actions being performed, which will not end well.
</p></li><li class="listitem"><p>
Cope with torn reads of <code class="filename">pg_control</code> in frontend
programs (Thomas Munro)
</p><p>
On some file systems, reading <code class="filename">pg_control</code> may
not be an atomic action when the server concurrently writes that
file. This is detectable via a bad CRC. Retry a few times to see
if the file becomes valid before we report error.
</p></li><li class="listitem"><p>
Avoid torn reads of <code class="filename">pg_control</code> in relevant SQL
functions (Thomas Munro)
</p><p>
Acquire the appropriate lock before
reading <code class="filename">pg_control</code>, to ensure we get a
consistent view of that file.
</p></li><li class="listitem"><p>
Avoid integer overflow when computing size of backend activity
string array (Jakub Wartak)
</p><p>
On 64-bit machines we will allow values
of <code class="varname">track_activity_query_size</code> large enough to
cause 32-bit overflow when multiplied by the allowed number of
connections. The code actually allocating the per-backend local
array was careless about this though, and allocated the array
incorrectly.
</p></li><li class="listitem"><p>
Fix briefly showing inconsistent progress statistics
for <code class="command">ANALYZE</code> on inherited tables
(Heikki Linnakangas)
</p><p>
The block-level counters should be reset to zero at the same time we
update the current-relation field.
</p></li><li class="listitem"><p>
Fix the background writer to report any WAL writes it makes to the
statistics counters (Nazir Bilal Yavuz)
</p></li><li class="listitem"><p>
Fix confusion about forced-flush behavior
in <code class="function">pgstat_report_wal()</code>
(Ryoga Yoshida, Michael Paquier)
</p><p>
This could result in some statistics about WAL I/O being forgotten
in a shutdown.
</p></li><li class="listitem"><p>
Track the dependencies of cached <code class="command">CALL</code> statements,
and re-plan them when needed (Tom Lane)
</p><p>
DDL commands, such as replacement of a function that has been
inlined into a <code class="command">CALL</code> argument, can create the need
to re-plan a <code class="command">CALL</code> that has been cached by
PL/pgSQL. That was not happening, leading to misbehavior or strange
errors such as <span class="quote">“<span class="quote">cache lookup failed</span>”</span>.
</p></li><li class="listitem"><p>
Avoid a possible pfree-a-NULL-pointer crash after an error in
OpenSSL connection setup (Sergey Shinderuk)
</p></li><li class="listitem"><p>
Track nesting depth correctly when
inspecting <code class="type">RECORD</code>-type Vars from outer query levels
(Richard Guo)
</p><p>
This oversight could lead to assertion failures, core dumps,
or <span class="quote">“<span class="quote">bogus varno</span>”</span> errors.
</p></li><li class="listitem"><p>
Track hash function and negator function dependencies of
ScalarArrayOpExpr plan nodes (David Rowley)
</p><p>
In most cases this oversight was harmless, since these functions
would be unlikely to disappear while the node's original operator
remains present.
</p></li><li class="listitem"><p>
Fix error-handling bug in <code class="type">RECORD</code> type cache management
(Thomas Munro)
</p><p>
An out-of-memory error occurring at just the wrong point could leave
behind inconsistent state that would lead to an infinite loop.
</p></li><li class="listitem"><p>
Fix assertion failure when logical decoding is retried in the same
session after an error (Hou Zhijie)
</p></li><li class="listitem"><p>
Treat out-of-memory failures as fatal while reading WAL
(Michael Paquier)
</p><p>
Previously this would be treated as a bogus-data condition, leading
to the conclusion that we'd reached the end of WAL, which is
incorrect and could lead to inconsistent WAL replay.
</p></li><li class="listitem"><p>
Fix possible recovery failure due to trying to allocate memory based
on a bogus WAL record length field (Thomas Munro, Michael Paquier)
</p></li><li class="listitem"><p>
Fix race condition in database dropping that could lead to the
autovacuum launcher getting stuck (Andres Freund, Will Mortensen,
Jacob Speidel)
</p><p>
The race could lead to a statistics entry for the removed database
remaining present, confusing the launcher's selection of which
database to process.
</p></li><li class="listitem"><p>
Fix datatype size confusion in logical tape management
(Ranier Vilela)
</p><p>
Integer overflow was possible on platforms where long is wider than
int, although it would take a multiple-terabyte temporary file to
cause a problem.
</p></li><li class="listitem"><p>
Avoid unintended close of syslogger process's stdin
(Heikki Linnakangas)
</p></li><li class="listitem"><p>
Avoid doing plan cache revalidation of utility statements
that do not receive interesting processing during parse analysis
(Tom Lane)
</p><p>
Aside from saving a few cycles, this prevents failure after a cache
invalidation for statements that must not set a snapshot, such
as <code class="command">SET TRANSACTION ISOLATION LEVEL</code>.
</p></li><li class="listitem"><p>
Keep by-reference <code class="structfield">attmissingval</code> values in
a long-lived context while they are being used (Andrew Dunstan)
</p><p>
This avoids possible use of dangling pointers when a tuple slot
outlives the tuple descriptor with which its value was constructed.
</p></li><li class="listitem"><p>
Recalculate the effective value of <code class="varname">search_path</code>
after <code class="command">ALTER ROLE</code> (Jeff Davis)
</p><p>
This ensures that after renaming a role, the meaning of the special
string <code class="literal">$user</code> is re-determined.
</p></li><li class="listitem"><p>
Fix <span class="quote">“<span class="quote">could not duplicate handle</span>”</span> error occurring on
Windows when <code class="varname">min_dynamic_shared_memory</code> is set
above zero (Thomas Munro)
</p></li><li class="listitem"><p>
Fix order of operations in <code class="function">GenericXLogFinish</code>
(Jeff Davis)
</p><p>
This code violated the conditions required for crash safety by
writing WAL before marking changed buffers dirty. No core code uses
this function, but extensions do (<code class="filename">contrib/bloom</code>
does, for example).
</p></li><li class="listitem"><p>
Remove incorrect assertion in PL/Python exception handling
(Alexander Lakhin)
</p></li><li class="listitem"><p>
Fix assertion failure in <span class="application">pg_dump</span> when
it's asked to dump the <code class="literal">pg_catalog</code> schema (Peter
Eisentraut)
</p></li><li class="listitem"><p>
Fix <span class="application">pg_restore</span> so that selective restores
will include both table-level and column-level ACLs for selected
tables (Euler Taveira, Tom Lane)
</p><p>
Formerly, only the table-level ACL would get restored if both types
were present.
</p></li><li class="listitem"><p>
Add logic to <span class="application">pg_upgrade</span> to check for use
of <code class="type">abstime</code>, <code class="type">reltime</code>,
and <code class="type">tinterval</code> data types (Álvaro Herrera)
</p><p>
These obsolete data types were removed
in <span class="productname">PostgreSQL</span> version 12, so check to
make sure they aren't present in an older database before claiming
it can be upgraded.
</p></li><li class="listitem"><p>
Avoid generating invalid temporary slot names
in <span class="application">pg_basebackup</span> (Jelte Fennema)
</p><p>
This has only been seen to occur when the server connection runs
through <span class="application">pgbouncer</span>.
</p></li><li class="listitem"><p>
Avoid false <span class="quote">“<span class="quote">too many client connections</span>”</span> errors
in <span class="application">pgbench</span> on Windows (Noah Misch)
</p></li><li class="listitem"><p>
In <code class="filename">contrib/amcheck</code>, do not report interrupted
page deletion as corruption (Noah Misch)
</p><p>
This fix prevents false-positive reports of <span class="quote">“<span class="quote">the first child
of leftmost target page is not leftmost of its
level</span>”</span>, <span class="quote">“<span class="quote">block NNNN is not leftmost</span>”</span>
or <span class="quote">“<span class="quote">left link/right link pair in index XXXX not in
agreement</span>”</span>. They appeared
if <span class="application">amcheck</span> ran after an unfinished btree
index page deletion and before <code class="command">VACUUM</code> had cleaned
things up.
</p></li><li class="listitem"><p>
Fix failure of <code class="filename">contrib/btree_gin</code> indexes
on <code class="type">interval</code> columns,
when an indexscan using the <code class="literal"><</code>
or <code class="literal"><=</code> operator is performed (Dean Rasheed)
</p><p>
Such an indexscan failed to return all the entries it should.
</p></li><li class="listitem"><p>
Add support for LLVM 16 and 17 (Thomas Munro, Dmitry Dolgov)
</p></li><li class="listitem"><p>
Suppress assorted build-time warnings on
recent <span class="productname">macOS</span> (Tom Lane)
</p><p>
<span class="productname">Xcode 15</span> (released
with <span class="productname">macOS Sonoma</span>) changed the linker's
behavior in a way that causes many duplicate-library warnings while
building <span class="productname">PostgreSQL</span>. These were
harmless, but they're annoying so avoid citing the same libraries
twice. Also remove use of the <code class="option">-multiply_defined
suppress</code> linker switch, which apparently has been a no-op
for a long time, and is now actively complained of.
</p></li><li class="listitem"><p>
When building <code class="filename">contrib/unaccent</code>'s rules file,
fall back to using <code class="literal">python</code>
if <code class="literal">--with-python</code> was not given and make
variable <code class="literal">PYTHON</code> was not set (Japin Li)
</p></li><li class="listitem"><p>
Remove <code class="literal">PHOT</code> (Phoenix Islands Time) from the
default timezone abbreviations list (Tom Lane)
</p><p>
Presence of this abbreviation in the default list can cause failures
on recent Debian and Ubuntu releases, as they no longer install the
underlying tzdb entry by default. Since this is a made-up
abbreviation for a zone with a total human population of about two
dozen, it seems unlikely that anyone will miss it. If someone does,
they can put it back via a custom abbreviations file.
</p></li></ul></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="release-15-6.html" title="E.1. Release 15.6">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="release.html" title="Appendix E. Release Notes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="release-15-4.html" title="E.3. Release 15.4">Next</a></td></tr><tr><td width="40%" align="left" valign="top">E.1. Release 15.6 </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="40%" align="right" valign="top"> E.3. Release 15.4</td></tr></table></div></body></html>
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