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>Appendix E. Release Notes</TD
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><A
NAME="RELEASE-8-2-6"
>E.139. Release 8.2.6</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2008-01-07</P
></DIV
><P
> This release contains a variety of fixes from 8.2.5,
including fixes for significant security issues.
For information about new features in the 8.2 major release, see
<A
HREF="release-8-2.html"
>Section E.145</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN133844"
>E.139.1. Migration to Version 8.2.6</A
></H2
><P
> A dump/restore is not required for those running 8.2.X.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN133847"
>E.139.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Prevent functions in indexes from executing with the privileges of
the user running <TT
CLASS="COMMAND"
>VACUUM</TT
>, <TT
CLASS="COMMAND"
>ANALYZE</TT
>, etc (Tom)
</P
><P
> Functions used in index expressions and partial-index
predicates are evaluated whenever a new table entry is made. It has
long been understood that this poses a risk of trojan-horse code
execution if one modifies a table owned by an untrustworthy user.
(Note that triggers, defaults, check constraints, etc. pose the
same type of risk.) But functions in indexes pose extra danger
because they will be executed by routine maintenance operations
such as <TT
CLASS="COMMAND"
>VACUUM FULL</TT
>, which are commonly performed
automatically under a superuser account. For example, a nefarious user
can execute code with superuser privileges by setting up a
trojan-horse index definition and waiting for the next routine vacuum.
The fix arranges for standard maintenance operations
(including <TT
CLASS="COMMAND"
>VACUUM</TT
>, <TT
CLASS="COMMAND"
>ANALYZE</TT
>, <TT
CLASS="COMMAND"
>REINDEX</TT
>,
and <TT
CLASS="COMMAND"
>CLUSTER</TT
>) to execute as the table owner rather than
the calling user, using the same privilege-switching mechanism already
used for <TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
> functions. To prevent bypassing
this security measure, execution of <TT
CLASS="COMMAND"
>SET SESSION
AUTHORIZATION</TT
> and <TT
CLASS="COMMAND"
>SET ROLE</TT
> is now forbidden within a
<TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
> context. (CVE-2007-6600)
</P
></LI
><LI
><P
> Repair assorted bugs in the regular-expression package (Tom, Will Drewry)
</P
><P
> Suitably crafted regular-expression patterns could cause crashes,
infinite or near-infinite looping, and/or massive memory consumption,
all of which pose denial-of-service hazards for applications that
accept regex search patterns from untrustworthy sources.
(CVE-2007-4769, CVE-2007-4772, CVE-2007-6067)
</P
></LI
><LI
><P
> Require non-superusers who use <TT
CLASS="FILENAME"
>/contrib/dblink</TT
> to use only
password authentication, as a security measure (Joe)
</P
><P
> The fix that appeared for this in 8.2.5 was incomplete, as it plugged
the hole for only some <TT
CLASS="FILENAME"
>dblink</TT
> functions. (CVE-2007-6601,
CVE-2007-3278)
</P
></LI
><LI
><P
> Fix bugs in WAL replay for GIN indexes (Teodor)
</P
></LI
><LI
><P
> Fix GIN index build to work properly when
<TT
CLASS="VARNAME"
>maintenance_work_mem</TT
> is 4GB or more (Tom)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2007k
(in particular, recent Argentina changes) (Tom)
</P
></LI
><LI
><P
> Improve planner's handling of LIKE/regex estimation in non-C locales
(Tom)
</P
></LI
><LI
><P
> Fix planning-speed problem for deep outer-join nests, as well as
possible poor choice of join order (Tom)
</P
></LI
><LI
><P
> Fix planner failure in some cases of <TT
CLASS="LITERAL"
>WHERE false AND var IN
(SELECT ...)</TT
> (Tom)
</P
></LI
><LI
><P
> Make <TT
CLASS="COMMAND"
>CREATE TABLE ... SERIAL</TT
> and
<TT
CLASS="COMMAND"
>ALTER SEQUENCE ... OWNED BY</TT
> not change the
<CODE
CLASS="FUNCTION"
>currval()</CODE
> state of the sequence (Tom)
</P
></LI
><LI
><P
> Preserve the tablespace and storage parameters of indexes that are
rebuilt by <TT
CLASS="COMMAND"
>ALTER TABLE ... ALTER COLUMN TYPE</TT
> (Tom)
</P
></LI
><LI
><P
> Make archive recovery always start a new WAL timeline, rather than only
when a recovery stop time was used (Simon)
</P
><P
> This avoids a corner-case risk of trying to overwrite an existing
archived copy of the last WAL segment, and seems simpler and cleaner
than the original definition.
</P
></LI
><LI
><P
> Make <TT
CLASS="COMMAND"
>VACUUM</TT
> not use all of <TT
CLASS="VARNAME"
>maintenance_work_mem</TT
>
when the table is too small for it to be useful (Alvaro)
</P
></LI
><LI
><P
> Fix potential crash in <CODE
CLASS="FUNCTION"
>translate()</CODE
> when using a multibyte
database encoding (Tom)
</P
></LI
><LI
><P
> Make <CODE
CLASS="FUNCTION"
>corr()</CODE
> return the correct result for negative
correlation values (Neil)
</P
></LI
><LI
><P
> Fix overflow in <TT
CLASS="LITERAL"
>extract(epoch from interval)</TT
> for intervals
exceeding 68 years (Tom)
</P
></LI
><LI
><P
> Fix PL/Perl to not fail when a UTF-8 regular expression is used
in a trusted function (Andrew)
</P
></LI
><LI
><P
> Fix PL/Perl to cope when platform's Perl defines type <TT
CLASS="LITERAL"
>bool</TT
>
as <TT
CLASS="LITERAL"
>int</TT
> rather than <TT
CLASS="LITERAL"
>char</TT
> (Tom)
</P
><P
> While this could theoretically happen anywhere, no standard build of
Perl did things this way ... until <SPAN
CLASS="PRODUCTNAME"
>Mac OS X</SPAN
> 10.5.
</P
></LI
><LI
><P
> Fix PL/Python to work correctly with Python 2.5 on 64-bit machines
(Marko Kreen)
</P
></LI
><LI
><P
> Fix PL/Python to not crash on long exception messages (Alvaro)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> to correctly handle inheritance child tables
that have default expressions different from their parent's (Tom)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> crash when <TT
CLASS="VARNAME"
>PGPASSFILE</TT
> refers
to a file that is not a plain file (Martin Pitt)
</P
></LI
><LI
><P
> <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> parser fixes (Michael)
</P
></LI
><LI
><P
> Make <TT
CLASS="FILENAME"
>contrib/pgcrypto</TT
> defend against
<SPAN
CLASS="APPLICATION"
>OpenSSL</SPAN
> libraries that fail on keys longer than 128
bits; which is the case at least on some Solaris versions (Marko Kreen)
</P
></LI
><LI
><P
> Make <TT
CLASS="FILENAME"
>contrib/tablefunc</TT
>'s <CODE
CLASS="FUNCTION"
>crosstab()</CODE
> handle
NULL rowid as a category in its own right, rather than crashing (Joe)
</P
></LI
><LI
><P
> Fix <TT
CLASS="TYPE"
>tsvector</TT
> and <TT
CLASS="TYPE"
>tsquery</TT
> output routines to
escape backslashes correctly (Teodor, Bruce)
</P
></LI
><LI
><P
> Fix crash of <CODE
CLASS="FUNCTION"
>to_tsvector()</CODE
> on huge input strings (Teodor)
</P
></LI
><LI
><P
> Require a specific version of <SPAN
CLASS="PRODUCTNAME"
>Autoconf</SPAN
> to be used
when re-generating the <TT
CLASS="COMMAND"
>configure</TT
> script (Peter)
</P
><P
> This affects developers and packagers only. The change was made
to prevent accidental use of untested combinations of
<SPAN
CLASS="PRODUCTNAME"
>Autoconf</SPAN
> and <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> versions.
You can remove the version check if you really want to use a
different <SPAN
CLASS="PRODUCTNAME"
>Autoconf</SPAN
> version, but it's
your responsibility whether the result works or not.
</P
></LI
><LI
><P
> Update <CODE
CLASS="FUNCTION"
>gettimeofday</CODE
> configuration check so that
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> can be built on newer versions of
<SPAN
CLASS="PRODUCTNAME"
>MinGW</SPAN
> (Magnus)
</P
></LI
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