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><A
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>E.3. Release 9.2.22</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2017-08-10</P
></DIV
><P
> This release contains a variety of fixes from 9.2.21.
For information about new features in the 9.2 major release, see
<A
HREF="release-9-2.html"
>Section E.25</A
>.
</P
><P
> The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> community will stop releasing updates
for the 9.2.X release series in September 2017.
Users are encouraged to update to a newer release branch soon.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN110943"
>E.3.1. Migration to Version 9.2.22</A
></H2
><P
> A dump/restore is not required for those running 9.2.X.
</P
><P
> However, if you use foreign data servers that make use of user
passwords for authentication, see the first changelog entry below.
</P
><P
> Also, if you are upgrading from a version earlier than 9.2.20,
see <A
HREF="release-9-2-20.html"
>Section E.5</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN110949"
>E.3.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Further restrict visibility
of <TT
CLASS="STRUCTNAME"
>pg_user_mappings</TT
>.<TT
CLASS="STRUCTFIELD"
>umoptions</TT
>, to
protect passwords stored as user mapping options
(Noah Misch)
</P
><P
> The fix for CVE-2017-7486 was incorrect: it allowed a user
to see the options in her own user mapping, even if she did not
have <TT
CLASS="LITERAL"
>USAGE</TT
> permission on the associated foreign server.
Such options might include a password that had been provided by the
server owner rather than the user herself.
Since <TT
CLASS="STRUCTNAME"
>information_schema.user_mapping_options</TT
> does not
show the options in such cases, <TT
CLASS="STRUCTNAME"
>pg_user_mappings</TT
>
should not either.
(CVE-2017-7547)
</P
><P
> By itself, this patch will only fix the behavior in newly initdb'd
databases. If you wish to apply this change in an existing database,
you will need to do the following:
</P
><DIV
CLASS="PROCEDURE"
><OL
TYPE="1"
><LI
CLASS="STEP"
><P
> Restart the postmaster after adding <TT
CLASS="LITERAL"
>allow_system_table_mods
= true</TT
> to <TT
CLASS="FILENAME"
>postgresql.conf</TT
>. (In versions
supporting <TT
CLASS="COMMAND"
>ALTER SYSTEM</TT
>, you can use that to make the
configuration change, but you'll still need a restart.)
</P
></LI
><LI
CLASS="STEP"
><P
> In <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>each</I
></SPAN
> database of the cluster,
run the following commands as superuser:
</P><PRE
CLASS="PROGRAMLISTING"
>SET search_path = pg_catalog;
CREATE OR REPLACE VIEW pg_user_mappings AS
SELECT
U.oid AS umid,
S.oid AS srvid,
S.srvname AS srvname,
U.umuser AS umuser,
CASE WHEN U.umuser = 0 THEN
'public'
ELSE
A.rolname
END AS usename,
CASE WHEN (U.umuser <> 0 AND A.rolname = current_user
AND (pg_has_role(S.srvowner, 'USAGE')
OR has_server_privilege(S.oid, 'USAGE')))
OR (U.umuser = 0 AND pg_has_role(S.srvowner, 'USAGE'))
OR (SELECT rolsuper FROM pg_authid WHERE rolname = current_user)
THEN U.umoptions
ELSE NULL END AS umoptions
FROM pg_user_mapping U
LEFT JOIN pg_authid A ON (A.oid = U.umuser) JOIN
pg_foreign_server S ON (U.umserver = S.oid);</PRE
><P>
</P
></LI
><LI
CLASS="STEP"
><P
> Do not forget to include the <TT
CLASS="LITERAL"
>template0</TT
>
and <TT
CLASS="LITERAL"
>template1</TT
> databases, or the vulnerability will still
exist in databases you create later. To fix <TT
CLASS="LITERAL"
>template0</TT
>,
you'll need to temporarily make it accept connections.
In <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.5 and later, you can use
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER DATABASE template0 WITH ALLOW_CONNECTIONS true;</PRE
><P>
and then after fixing <TT
CLASS="LITERAL"
>template0</TT
>, undo that with
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER DATABASE template0 WITH ALLOW_CONNECTIONS false;</PRE
><P>
In prior versions, instead use
</P><PRE
CLASS="PROGRAMLISTING"
>UPDATE pg_database SET datallowconn = true WHERE datname = 'template0';
UPDATE pg_database SET datallowconn = false WHERE datname = 'template0';</PRE
><P>
</P
></LI
><LI
CLASS="STEP"
><P
> Finally, remove the <TT
CLASS="LITERAL"
>allow_system_table_mods</TT
> configuration
setting, and again restart the postmaster.
</P
></LI
></OL
></DIV
></LI
><LI
><P
> Disallow empty passwords in all password-based authentication methods
(Heikki Linnakangas)
</P
><P
> <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> ignores empty password specifications, and does
not transmit them to the server. So, if a user's password has been
set to the empty string, it's impossible to log in with that password
via <SPAN
CLASS="APPLICATION"
>psql</SPAN
> or other <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>-based
clients. An administrator might therefore believe that setting the
password to empty is equivalent to disabling password login.
However, with a modified or non-<SPAN
CLASS="APPLICATION"
>libpq</SPAN
>-based client,
logging in could be possible, depending on which authentication
method is configured. In particular the most common
method, <TT
CLASS="LITERAL"
>md5</TT
>, accepted empty passwords.
Change the server to reject empty passwords in all cases.
(CVE-2017-7546)
</P
></LI
><LI
><P
> On Windows, retry process creation if we fail to reserve the address
range for our shared memory in the new process (Tom Lane, Amit
Kapila)
</P
><P
> This is expected to fix infrequent child-process-launch failures that
are probably due to interference from antivirus products.
</P
></LI
><LI
><P
> Fix low-probability corruption of shared predicate-lock hash table
in Windows builds (Thomas Munro, Tom Lane)
</P
></LI
><LI
><P
> Avoid logging clean closure of an SSL connection as though
it were a connection reset (Michael Paquier)
</P
></LI
><LI
><P
> Prevent sending SSL session tickets to clients (Tom Lane)
</P
><P
> This fix prevents reconnection failures with ticket-aware client-side
SSL code.
</P
></LI
><LI
><P
> Fix code for setting <A
HREF="runtime-config-connection.html#GUC-TCP-KEEPALIVES-IDLE"
>tcp_keepalives_idle</A
> on
Solaris (Tom Lane)
</P
></LI
><LI
><P
> Fix statistics collector to honor inquiry messages issued just after
a postmaster shutdown and immediate restart (Tom Lane)
</P
><P
> Statistics inquiries issued within half a second of the previous
postmaster shutdown were effectively ignored.
</P
></LI
><LI
><P
> Ensure that the statistics collector's receive buffer size is at
least 100KB (Tom Lane)
</P
><P
> This reduces the risk of dropped statistics data on older platforms
whose default receive buffer size is less than that.
</P
></LI
><LI
><P
> Fix possible creation of an invalid WAL segment when a standby is
promoted just after it processes an <TT
CLASS="LITERAL"
>XLOG_SWITCH</TT
> WAL
record (Andres Freund)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="SYSTEMITEM"
>SIGHUP</SPAN
> and <SPAN
CLASS="SYSTEMITEM"
>SIGUSR1</SPAN
> handling in
walsender processes (Petr Jelinek, Andres Freund)
</P
></LI
><LI
><P
> Fix unnecessarily slow restarts of <SPAN
CLASS="APPLICATION"
>walreceiver</SPAN
>
processes due to race condition in postmaster (Tom Lane)
</P
></LI
><LI
><P
> Fix cases where an <TT
CLASS="COMMAND"
>INSERT</TT
> or <TT
CLASS="COMMAND"
>UPDATE</TT
> assigns
to more than one element of a column that is of domain-over-array
type (Tom Lane)
</P
></LI
><LI
><P
> Move autogenerated array types out of the way during
<TT
CLASS="COMMAND"
>ALTER ... RENAME</TT
> (Vik Fearing)
</P
><P
> Previously, we would rename a conflicting autogenerated array type
out of the way during <TT
CLASS="COMMAND"
>CREATE</TT
>; this fix extends that
behavior to renaming operations.
</P
></LI
><LI
><P
> Ensure that <TT
CLASS="COMMAND"
>ALTER USER ... SET</TT
> accepts all the syntax
variants that <TT
CLASS="COMMAND"
>ALTER ROLE ... SET</TT
> does (Peter Eisentraut)
</P
></LI
><LI
><P
> Properly update dependency info when changing a datatype I/O
function's argument or return type from <TT
CLASS="TYPE"
>opaque</TT
> to the
correct type (Heikki Linnakangas)
</P
><P
> <TT
CLASS="COMMAND"
>CREATE TYPE</TT
> updates I/O functions declared in this
long-obsolete style, but it forgot to record a dependency on the
type, allowing a subsequent <TT
CLASS="COMMAND"
>DROP TYPE</TT
> to leave broken
function definitions behind.
</P
></LI
><LI
><P
> Reduce memory usage when <TT
CLASS="COMMAND"
>ANALYZE</TT
> processes
a <TT
CLASS="TYPE"
>tsvector</TT
> column (Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix unnecessary precision loss and sloppy rounding when multiplying
or dividing <TT
CLASS="TYPE"
>money</TT
> values by integers or floats (Tom Lane)
</P
></LI
><LI
><P
> Tighten checks for whitespace in functions that parse identifiers,
such as <CODE
CLASS="FUNCTION"
>regprocedurein()</CODE
> (Tom Lane)
</P
><P
> Depending on the prevailing locale, these functions could
misinterpret fragments of multibyte characters as whitespace.
</P
></LI
><LI
><P
> Use relevant <TT
CLASS="LITERAL"
>#define</TT
> symbols from Perl while
compiling <SPAN
CLASS="APPLICATION"
>PL/Perl</SPAN
> (Ashutosh Sharma, Tom Lane)
</P
><P
> This avoids portability problems, typically manifesting as
a <SPAN
CLASS="QUOTE"
>"handshake"</SPAN
> mismatch during library load, when working with
recent Perl versions.
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>psql</SPAN
>, fix failure when <TT
CLASS="COMMAND"
>COPY FROM STDIN</TT
>
is ended with a keyboard EOF signal and then another <TT
CLASS="COMMAND"
>COPY
FROM STDIN</TT
> is attempted (Thomas Munro)
</P
><P
> This misbehavior was observed on BSD-derived platforms (including
macOS), but not on most others.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> to not emit invalid SQL for an empty
operator class (Daniel Gustafsson)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> output to stdout on Windows (Kuntal Ghosh)
</P
><P
> A compressed plain-text dump written to stdout would contain corrupt
data due to failure to put the file descriptor into binary mode.
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>pg_get_ruledef()</CODE
> to print correct output for
the <TT
CLASS="LITERAL"
>ON SELECT</TT
> rule of a view whose columns have been
renamed (Tom Lane)
</P
><P
> In some corner cases, <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> relies
on <CODE
CLASS="FUNCTION"
>pg_get_ruledef()</CODE
> to dump views, so that this error
could result in dump/reload failures.
</P
></LI
><LI
><P
> Fix dumping of function expressions in the <TT
CLASS="LITERAL"
>FROM</TT
> clause in
cases where the expression does not deparse into something that looks
like a function call (Tom Lane)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_basebackup</SPAN
> output to stdout on Windows
(Haribabu Kommi)
</P
><P
> A backup written to stdout would contain corrupt data due to failure
to put the file descriptor into binary mode.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to ensure that the ending WAL record
does not have <A
HREF="runtime-config-wal.html#GUC-WAL-LEVEL"
>wal_level</A
> = <TT
CLASS="LITERAL"
>minimum</TT
>
(Bruce Momjian)
</P
><P
> This condition could prevent upgraded standby servers from
reconnecting.
</P
></LI
><LI
><P
> Always use <TT
CLASS="OPTION"
>-fPIC</TT
>, not <TT
CLASS="OPTION"
>-fpic</TT
>, when building
shared libraries with gcc (Tom Lane)
</P
><P
> This supports larger extension libraries on platforms where it makes
a difference.
</P
></LI
><LI
><P
> Fix unescaped-braces issue in our build scripts for Microsoft MSVC,
to avoid a warning or error from recent Perl versions (Andrew
Dunstan)
</P
></LI
><LI
><P
> In MSVC builds, handle the case where the <SPAN
CLASS="APPLICATION"
>openssl</SPAN
>
library is not within a <TT
CLASS="FILENAME"
>VC</TT
> subdirectory (Andrew Dunstan)
</P
></LI
><LI
><P
> In MSVC builds, add proper include path for <SPAN
CLASS="APPLICATION"
>libxml2</SPAN
>
header files (Andrew Dunstan)
</P
><P
> This fixes a former need to move things around in standard Windows
installations of <SPAN
CLASS="APPLICATION"
>libxml2</SPAN
>.
</P
></LI
><LI
><P
> In MSVC builds, recognize a Tcl library that is
named <TT
CLASS="FILENAME"
>tcl86.lib</TT
> (Noah Misch)
</P
></LI
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