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>Appendix E. Release Notes</TD
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><A
NAME="RELEASE-9-5-2"
>E.12. Release 9.5.2</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2016-03-31</P
></DIV
><P
> This release contains a variety of fixes from 9.5.1.
For information about new features in the 9.5 major release, see
<A
HREF="release-9-5.html"
>Section E.14</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN134097"
>E.12.1. Migration to Version 9.5.2</A
></H2
><P
> A dump/restore is not required for those running 9.5.X.
</P
><P
> However, you may need to <TT
CLASS="COMMAND"
>REINDEX</TT
> some indexes after applying
the update, as per the first changelog entry below.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN134102"
>E.12.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Disable abbreviated keys for string sorting in non-<TT
CLASS="LITERAL"
>C</TT
>
locales (Robert Haas)
</P
><P
> <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.5 introduced logic for speeding up
comparisons of string data types by using the standard C library
function <CODE
CLASS="FUNCTION"
>strxfrm()</CODE
> as a substitute
for <CODE
CLASS="FUNCTION"
>strcoll()</CODE
>. It now emerges that most versions of
glibc (Linux's implementation of the C library) have buggy
implementations of <CODE
CLASS="FUNCTION"
>strxfrm()</CODE
> that, in some locales,
can produce string comparison results that do not
match <CODE
CLASS="FUNCTION"
>strcoll()</CODE
>. Until this problem can be better
characterized, disable the optimization in all non-<TT
CLASS="LITERAL"
>C</TT
>
locales. (<TT
CLASS="LITERAL"
>C</TT
> locale is safe since it uses
neither <CODE
CLASS="FUNCTION"
>strcoll()</CODE
> nor <CODE
CLASS="FUNCTION"
>strxfrm()</CODE
>.)
</P
><P
> Unfortunately, this problem affects not only sorting but also entry
ordering in B-tree indexes, which means that B-tree indexes
on <TT
CLASS="TYPE"
>text</TT
>, <TT
CLASS="TYPE"
>varchar</TT
>, or <TT
CLASS="TYPE"
>char</TT
> columns may now
be corrupt if they sort according to an affected locale and were
built or modified under <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.5.0 or 9.5.1.
Users should <TT
CLASS="COMMAND"
>REINDEX</TT
> indexes that might be affected.
</P
><P
> It is not possible at this time to give an exhaustive list of
known-affected locales. <TT
CLASS="LITERAL"
>C</TT
> locale is known safe, and
there is no evidence of trouble in English-based locales such
as <TT
CLASS="LITERAL"
>en_US</TT
>, but some other popular locales such
as <TT
CLASS="LITERAL"
>de_DE</TT
> are affected in most glibc versions.
</P
></LI
><LI
><P
> Maintain row-security status properly in cached plans (Stephen Frost)
</P
><P
> In a session that performs queries as more than one role, the plan
cache might incorrectly re-use a plan that was generated for another
role ID, thus possibly applying the wrong set of policies when
row-level security (RLS) is in use.
(CVE-2016-2193)
</P
></LI
><LI
><P
> Add must-be-superuser checks to some
new <TT
CLASS="FILENAME"
>contrib/pageinspect</TT
> functions (Andreas Seltenreich)
</P
><P
> Most functions in the <TT
CLASS="FILENAME"
>pageinspect</TT
> extension that
inspect <TT
CLASS="TYPE"
>bytea</TT
> values disallow calls by non-superusers,
but <CODE
CLASS="FUNCTION"
>brin_page_type()</CODE
> and <CODE
CLASS="FUNCTION"
>brin_metapage_info()</CODE
>
failed to do so. Passing contrived <TT
CLASS="TYPE"
>bytea</TT
> values to them might
crash the server or disclose a few bytes of server memory. Add the
missing permissions checks to prevent misuse.
(CVE-2016-3065)
</P
></LI
><LI
><P
> Fix incorrect handling of indexed <TT
CLASS="LITERAL"
>ROW()</TT
> comparisons
(Simon Riggs)
</P
><P
> Flaws in a minor optimization introduced in 9.5 caused incorrect
results if the <TT
CLASS="LITERAL"
>ROW()</TT
> comparison matches the index ordering
partially but not exactly (for example, differing column order, or the
index contains both <TT
CLASS="LITERAL"
>ASC</TT
> and <TT
CLASS="LITERAL"
>DESC</TT
> columns).
Pending a better solution, the optimization has been removed.
</P
></LI
><LI
><P
> Fix incorrect handling of NULL index entries in
indexed <TT
CLASS="LITERAL"
>ROW()</TT
> comparisons (Tom Lane)
</P
><P
> An index search using a row comparison such as <TT
CLASS="LITERAL"
>ROW(a, b) >
ROW('x', 'y')</TT
> would stop upon reaching a NULL entry in
the <TT
CLASS="STRUCTFIELD"
>b</TT
> column, ignoring the fact that there might be
non-NULL <TT
CLASS="STRUCTFIELD"
>b</TT
> values associated with later values
of <TT
CLASS="STRUCTFIELD"
>a</TT
>.
</P
></LI
><LI
><P
> Avoid unlikely data-loss scenarios due to renaming files without
adequate <CODE
CLASS="FUNCTION"
>fsync()</CODE
> calls before and after (Michael Paquier,
Tomas Vondra, Andres Freund)
</P
></LI
><LI
><P
> Fix incorrect behavior when rechecking a just-modified row in a query
that does <TT
CLASS="COMMAND"
>SELECT FOR UPDATE/SHARE</TT
> and contains some
relations that need not be locked (Tom Lane)
</P
><P
> Rows from non-locked relations were incorrectly treated as containing
all NULLs during the recheck, which could result in incorrectly
deciding that the updated row no longer passes the <TT
CLASS="LITERAL"
>WHERE</TT
>
condition, or in incorrectly outputting NULLs.
</P
></LI
><LI
><P
> Fix bug in <CODE
CLASS="FUNCTION"
>json_to_record()</CODE
> when a field of its input
object contains a sub-object with a field name matching one of the
requested output column names (Tom Lane)
</P
></LI
><LI
><P
> Fix nonsense result from two-argument form
of <CODE
CLASS="FUNCTION"
>jsonb_object()</CODE
> when called with empty arrays
(Michael Paquier, Andrew Dunstan)
</P
></LI
><LI
><P
> Fix misbehavior in <CODE
CLASS="FUNCTION"
>jsonb_set()</CODE
> when converting a path
array element into an integer for use as an array subscript
(Michael Paquier)
</P
></LI
><LI
><P
> Fix misformatting of negative time zone offsets
by <CODE
CLASS="FUNCTION"
>to_char()</CODE
>'s <TT
CLASS="LITERAL"
>OF</TT
> format code
(Thomas Munro, Tom Lane)
</P
></LI
><LI
><P
> Fix possible incorrect logging of waits done by
<TT
CLASS="COMMAND"
>INSERT ... ON CONFLICT</TT
> (Peter Geoghegan)
</P
><P
> Log messages would sometimes claim that the wait was due to an
exclusion constraint although no such constraint was responsible.
</P
></LI
><LI
><P
> Ignore <A
HREF="standby-settings.html#RECOVERY-MIN-APPLY-DELAY"
>recovery_min_apply_delay</A
> parameter until
recovery has reached a consistent state (Michael Paquier)
</P
><P
> Previously, standby servers would delay application of WAL records in
response to <TT
CLASS="VARNAME"
>recovery_min_apply_delay</TT
> even while replaying
the initial portion of WAL needed to make their database state valid.
Since the standby is useless until it's reached a consistent database
state, this was deemed unhelpful.
</P
></LI
><LI
><P
> Correctly handle cases where <TT
CLASS="LITERAL"
>pg_subtrans</TT
> is close to XID
wraparound during server startup (Jeff Janes)
</P
></LI
><LI
><P
> Fix assorted bugs in logical decoding (Andres Freund)
</P
><P
> Trouble cases included tuples larger than one page when replica
identity is <TT
CLASS="LITERAL"
>FULL</TT
>, <TT
CLASS="COMMAND"
>UPDATE</TT
>s that change a
primary key within a transaction large enough to be spooled to disk,
incorrect reports of <SPAN
CLASS="QUOTE"
>"subxact logged without previous toplevel
record"</SPAN
>, and incorrect reporting of a transaction's commit time.
</P
></LI
><LI
><P
> Fix planner error with nested security barrier views when the outer
view has a <TT
CLASS="LITERAL"
>WHERE</TT
> clause containing a correlated subquery
(Dean Rasheed)
</P
></LI
><LI
><P
> Fix memory leak in GIN index searches (Tom Lane)
</P
></LI
><LI
><P
> Fix corner-case crash due to trying to free <CODE
CLASS="FUNCTION"
>localeconv()</CODE
>
output strings more than once (Tom Lane)
</P
></LI
><LI
><P
> Fix parsing of affix files for <TT
CLASS="LITERAL"
>ispell</TT
> dictionaries
(Tom Lane)
</P
><P
> The code could go wrong if the affix file contained any characters
whose byte length changes during case-folding, for
example <TT
CLASS="LITERAL"
>I</TT
> in Turkish UTF8 locales.
</P
></LI
><LI
><P
> Avoid use of <CODE
CLASS="FUNCTION"
>sscanf()</CODE
> to parse <TT
CLASS="LITERAL"
>ispell</TT
>
dictionary files (Artur Zakirov)
</P
><P
> This dodges a portability problem on FreeBSD-derived platforms
(including macOS).
</P
></LI
><LI
><P
> Fix atomic-operations code used on PPC with IBM's xlc compiler
(Noah Misch)
</P
><P
> This error led to rare failures of concurrent operations on that
platform.
</P
></LI
><LI
><P
> Avoid a crash on old Windows versions (before 7SP1/2008R2SP1) with an
AVX2-capable CPU and a Postgres build done with Visual Studio 2013
(Christian Ullrich)
</P
><P
> This is a workaround for a bug in Visual Studio 2013's runtime
library, which Microsoft have stated they will not fix in that
version.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s tab completion logic to handle multibyte
characters properly (Kyotaro Horiguchi, Robert Haas)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s tab completion for
<TT
CLASS="LITERAL"
>SECURITY LABEL</TT
> (Tom Lane)
</P
><P
> Pressing TAB after <TT
CLASS="LITERAL"
>SECURITY LABEL</TT
> might cause a crash
or offering of inappropriate keywords.
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> accept a wait timeout from the
<TT
CLASS="ENVAR"
>PGCTLTIMEOUT</TT
> environment variable, if none is specified on
the command line (Noah Misch)
</P
><P
> This eases testing of slower buildfarm members by allowing them
to globally specify a longer-than-normal timeout for postmaster
startup and shutdown.
</P
></LI
><LI
><P
> Fix incorrect test for Windows service status
in <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> (Manuel Mathar)
</P
><P
> The previous set of minor releases attempted to
fix <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> to properly determine whether to send log
messages to Window's Event Log, but got the test backwards.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pgbench</SPAN
> to correctly handle the combination
of <TT
CLASS="LITERAL"
>-C</TT
> and <TT
CLASS="LITERAL"
>-M prepared</TT
> options (Tom Lane)
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>, skip creating a deletion script when
the new data directory is inside the old data directory (Bruce
Momjian)
</P
><P
> Blind application of the script in such cases would result in loss of
the new data directory.
</P
></LI
><LI
><P
> In PL/Perl, properly translate empty Postgres arrays into empty Perl
arrays (Alex Hunsaker)
</P
></LI
><LI
><P
> Make PL/Python cope with function names that aren't valid Python
identifiers (Jim Nasby)
</P
></LI
><LI
><P
> Fix multiple mistakes in the statistics returned
by <TT
CLASS="FILENAME"
>contrib/pgstattuple</TT
>'s <CODE
CLASS="FUNCTION"
>pgstatindex()</CODE
>
function (Tom Lane)
</P
></LI
><LI
><P
> Remove dependency on <TT
CLASS="LITERAL"
>psed</TT
> in MSVC builds, since it's no
longer provided by core Perl (Michael Paquier, Andrew Dunstan)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2016c
for DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia
(Altai, Astrakhan, Kirov, Sakhalin, Ulyanovsk regions), plus
historical corrections for Lithuania, Moldova, and Russia
(Kaliningrad, Samara, Volgograd).
</P
></LI
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