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>Appendix E. Release Notes</TD
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><H1
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><A
NAME="RELEASE-8-4-20"
>E.26. Release 8.4.20</A
></H1
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Release Date: </B
>2014-02-20</P
></BLOCKQUOTE
></DIV
><P
> This release contains a variety of fixes from 8.4.19.
For information about new features in the 8.4 major release, see
<A
HREF="release-8-4.html"
>Section E.46</A
>.
</P
><P
> The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> community will stop releasing updates
for the 8.4.X release series in July 2014.
Users are encouraged to update to a newer release branch soon.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN103691"
>E.26.1. Migration to Version 8.4.20</A
></H2
><P
> A dump/restore is not required for those running 8.4.X.
</P
><P
> However, if you are upgrading from a version earlier than 8.4.19,
see <A
HREF="release-8-4-19.html"
>Section E.27</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN103696"
>E.26.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Shore up <TT
CLASS="LITERAL"
>GRANT ... WITH ADMIN OPTION</TT
> restrictions
(Noah Misch)
</P
><P
> Granting a role without <TT
CLASS="LITERAL"
>ADMIN OPTION</TT
> is supposed to
prevent the grantee from adding or removing members from the granted
role, but this restriction was easily bypassed by doing <TT
CLASS="LITERAL"
>SET
ROLE</TT
> first. The security impact is mostly that a role member can
revoke the access of others, contrary to the wishes of his grantor.
Unapproved role member additions are a lesser concern, since an
uncooperative role member could provide most of his rights to others
anyway by creating views or <TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
> functions.
(CVE-2014-0060)
</P
></LI
><LI
><P
> Prevent privilege escalation via manual calls to PL validator
functions (Andres Freund)
</P
><P
> The primary role of PL validator functions is to be called implicitly
during <TT
CLASS="COMMAND"
>CREATE FUNCTION</TT
>, but they are also normal SQL
functions that a user can call explicitly. Calling a validator on
a function actually written in some other language was not checked
for and could be exploited for privilege-escalation purposes.
The fix involves adding a call to a privilege-checking function in
each validator function. Non-core procedural languages will also
need to make this change to their own validator functions, if any.
(CVE-2014-0061)
</P
></LI
><LI
><P
> Avoid multiple name lookups during table and index DDL
(Robert Haas, Andres Freund)
</P
><P
> If the name lookups come to different conclusions due to concurrent
activity, we might perform some parts of the DDL on a different table
than other parts. At least in the case of <TT
CLASS="COMMAND"
>CREATE INDEX</TT
>,
this can be used to cause the permissions checks to be performed
against a different table than the index creation, allowing for a
privilege escalation attack.
(CVE-2014-0062)
</P
></LI
><LI
><P
> Prevent buffer overrun with long datetime strings (Noah Misch)
</P
><P
> The <TT
CLASS="LITERAL"
>MAXDATELEN</TT
> constant was too small for the longest
possible value of type <TT
CLASS="TYPE"
>interval</TT
>, allowing a buffer overrun
in <CODE
CLASS="FUNCTION"
>interval_out()</CODE
>. Although the datetime input
functions were more careful about avoiding buffer overrun, the limit
was short enough to cause them to reject some valid inputs, such as
input containing a very long timezone name. The <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>
library contained these vulnerabilities along with some of its own.
(CVE-2014-0063)
</P
></LI
><LI
><P
> Prevent buffer overrun due to integer overflow in size calculations
(Noah Misch, Heikki Linnakangas)
</P
><P
> Several functions, mostly type input functions, calculated an
allocation size without checking for overflow. If overflow did
occur, a too-small buffer would be allocated and then written past.
(CVE-2014-0064)
</P
></LI
><LI
><P
> Prevent overruns of fixed-size buffers
(Peter Eisentraut, Jozef Mlich)
</P
><P
> Use <CODE
CLASS="FUNCTION"
>strlcpy()</CODE
> and related functions to provide a clear
guarantee that fixed-size buffers are not overrun. Unlike the
preceding items, it is unclear whether these cases really represent
live issues, since in most cases there appear to be previous
constraints on the size of the input string. Nonetheless it seems
prudent to silence all Coverity warnings of this type.
(CVE-2014-0065)
</P
></LI
><LI
><P
> Avoid crashing if <CODE
CLASS="FUNCTION"
>crypt()</CODE
> returns NULL (Honza Horak,
Bruce Momjian)
</P
><P
> There are relatively few scenarios in which <CODE
CLASS="FUNCTION"
>crypt()</CODE
>
could return NULL, but <TT
CLASS="FILENAME"
>contrib/chkpass</TT
> would crash
if it did. One practical case in which this could be an issue is
if <SPAN
CLASS="APPLICATION"
>libc</SPAN
> is configured to refuse to execute unapproved
hashing algorithms (e.g., <SPAN
CLASS="QUOTE"
>"FIPS mode"</SPAN
>).
(CVE-2014-0066)
</P
></LI
><LI
><P
> Document risks of <TT
CLASS="LITERAL"
>make check</TT
> in the regression testing
instructions (Noah Misch, Tom Lane)
</P
><P
> Since the temporary server started by <TT
CLASS="LITERAL"
>make check</TT
>
uses <SPAN
CLASS="QUOTE"
>"trust"</SPAN
> authentication, another user on the same machine
could connect to it as database superuser, and then potentially
exploit the privileges of the operating-system user who started the
tests. A future release will probably incorporate changes in the
testing procedure to prevent this risk, but some public discussion is
needed first. So for the moment, just warn people against using
<TT
CLASS="LITERAL"
>make check</TT
> when there are untrusted users on the
same machine.
(CVE-2014-0067)
</P
></LI
><LI
><P
> Fix possible mis-replay of WAL records when some segments of a
relation aren't full size (Greg Stark, Tom Lane)
</P
><P
> The WAL update could be applied to the wrong page, potentially many
pages past where it should have been. Aside from corrupting data,
this error has been observed to result in significant <SPAN
CLASS="QUOTE"
>"bloat"</SPAN
>
of standby servers compared to their masters, due to updates being
applied far beyond where the end-of-file should have been. This
failure mode does not appear to be a significant risk during crash
recovery, only when initially synchronizing a standby created from a
base backup taken from a quickly-changing master.
</P
></LI
><LI
><P
> Ensure that insertions into non-leaf GIN index pages write a full-page
WAL record when appropriate (Heikki Linnakangas)
</P
><P
> The previous coding risked index corruption in the event of a
partial-page write during a system crash.
</P
></LI
><LI
><P
> Fix race conditions during server process exit (Robert Haas)
</P
><P
> Ensure that signal handlers don't attempt to use the
process's <TT
CLASS="VARNAME"
>MyProc</TT
> pointer after it's no longer valid.
</P
></LI
><LI
><P
> Fix unsafe references to <TT
CLASS="VARNAME"
>errno</TT
> within error reporting
logic (Christian Kruse)
</P
><P
> This would typically lead to odd behaviors such as missing or
inappropriate <TT
CLASS="LITERAL"
>HINT</TT
> fields.
</P
></LI
><LI
><P
> Fix possible crashes from using <CODE
CLASS="FUNCTION"
>ereport()</CODE
> too early
during server startup (Tom Lane)
</P
><P
> The principal case we've seen in the field is a crash if the server
is started in a directory it doesn't have permission to read.
</P
></LI
><LI
><P
> Clear retry flags properly in OpenSSL socket write
function (Alexander Kukushkin)
</P
><P
> This omission could result in a server lockup after unexpected loss
of an SSL-encrypted connection.
</P
></LI
><LI
><P
> Fix length checking for Unicode identifiers (<TT
CLASS="LITERAL"
>U&"..."</TT
>
syntax) containing escapes (Tom Lane)
</P
><P
> A spurious truncation warning would be printed for such identifiers
if the escaped form of the identifier was too long, but the
identifier actually didn't need truncation after de-escaping.
</P
></LI
><LI
><P
> Fix possible crash due to invalid plan for nested sub-selects, such
as <TT
CLASS="LITERAL"
>WHERE (... x IN (SELECT ...) ...) IN (SELECT ...)</TT
>
(Tom Lane)
</P
></LI
><LI
><P
> Ensure that <TT
CLASS="COMMAND"
>ANALYZE</TT
> creates statistics for a table column
even when all the values in it are <SPAN
CLASS="QUOTE"
>"too wide"</SPAN
> (Tom Lane)
</P
><P
> <TT
CLASS="COMMAND"
>ANALYZE</TT
> intentionally omits very wide values from its
histogram and most-common-values calculations, but it neglected to do
something sane in the case that all the sampled entries are too wide.
</P
></LI
><LI
><P
> In <TT
CLASS="LITERAL"
>ALTER TABLE ... SET TABLESPACE</TT
>, allow the database's
default tablespace to be used without a permissions check
(Stephen Frost)
</P
><P
> <TT
CLASS="LITERAL"
>CREATE TABLE</TT
> has always allowed such usage,
but <TT
CLASS="LITERAL"
>ALTER TABLE</TT
> didn't get the memo.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="QUOTE"
>"cannot accept a set"</SPAN
> error when some arms of
a <TT
CLASS="LITERAL"
>CASE</TT
> return a set and others don't (Tom Lane)
</P
></LI
><LI
><P
> Fix checks for all-zero client addresses in pgstat functions (Kevin
Grittner)
</P
></LI
><LI
><P
> Fix possible misclassification of multibyte characters by the text
search parser (Tom Lane)
</P
><P
> Non-ASCII characters could be misclassified when using C locale with
a multibyte encoding. On Cygwin, non-C locales could fail as well.
</P
></LI
><LI
><P
> Fix possible misbehavior in <CODE
CLASS="FUNCTION"
>plainto_tsquery()</CODE
>
(Heikki Linnakangas)
</P
><P
> Use <CODE
CLASS="FUNCTION"
>memmove()</CODE
> not <CODE
CLASS="FUNCTION"
>memcpy()</CODE
> for copying
overlapping memory regions. There have been no field reports of
this actually causing trouble, but it's certainly risky.
</P
></LI
><LI
><P
> Accept <TT
CLASS="LITERAL"
>SHIFT_JIS</TT
> as an encoding name for locale checking
purposes (Tatsuo Ishii)
</P
></LI
><LI
><P
> Fix misbehavior of <CODE
CLASS="FUNCTION"
>PQhost()</CODE
> on Windows (Fujii Masao)
</P
><P
> It should return <TT
CLASS="LITERAL"
>localhost</TT
> if no host has been specified.
</P
></LI
><LI
><P
> Improve error handling in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> and <SPAN
CLASS="APPLICATION"
>psql</SPAN
>
for failures during <TT
CLASS="LITERAL"
>COPY TO STDOUT/FROM STDIN</TT
> (Tom Lane)
</P
><P
> In particular this fixes an infinite loop that could occur in 9.2 and
up if the server connection was lost during <TT
CLASS="LITERAL"
>COPY FROM
STDIN</TT
>. Variants of that scenario might be possible in older
versions, or with other client applications.
</P
></LI
><LI
><P
> Fix misaligned descriptors in <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> (MauMau)
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>, handle lack of a hostname in the connection
parameters properly (Michael Meskes)
</P
></LI
><LI
><P
> Fix performance regression in <TT
CLASS="FILENAME"
>contrib/dblink</TT
> connection
startup (Joe Conway)
</P
><P
> Avoid an unnecessary round trip when client and server encodings match.
</P
></LI
><LI
><P
> In <TT
CLASS="FILENAME"
>contrib/isn</TT
>, fix incorrect calculation of the check
digit for ISMN values (Fabien Coelho)
</P
></LI
><LI
><P
> Ensure client-code-only installation procedure works as documented
(Peter Eisentraut)
</P
></LI
><LI
><P
> In Mingw and Cygwin builds, install the <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> DLL
in the <TT
CLASS="FILENAME"
>bin</TT
> directory (Andrew Dunstan)
</P
><P
> This duplicates what the MSVC build has long done. It should fix
problems with programs like <SPAN
CLASS="APPLICATION"
>psql</SPAN
> failing to start
because they can't find the DLL.
</P
></LI
><LI
><P
> Don't generate plain-text <TT
CLASS="FILENAME"
>HISTORY</TT
>
and <TT
CLASS="FILENAME"
>src/test/regress/README</TT
> files anymore (Tom Lane)
</P
><P
> These text files duplicated the main HTML and PDF documentation
formats. The trouble involved in maintaining them greatly outweighs
the likely audience for plain-text format. Distribution tarballs
will still contain files by these names, but they'll just be stubs
directing the reader to consult the main documentation.
The plain-text <TT
CLASS="FILENAME"
>INSTALL</TT
> file will still be maintained, as
there is arguably a use-case for that.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2013i
for DST law changes in Jordan and historical changes in Cuba.
</P
><P
> In addition, the zones <TT
CLASS="LITERAL"
>Asia/Riyadh87</TT
>,
<TT
CLASS="LITERAL"
>Asia/Riyadh88</TT
>, and <TT
CLASS="LITERAL"
>Asia/Riyadh89</TT
> have been
removed, as they are no longer maintained by IANA, and never
represented actual civil timekeeping practice.
</P
></LI
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