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>E.148. Release 8.1.21</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2010-05-17</P
></DIV
><P
> This release contains a variety of fixes from 8.1.20.
For information about new features in the 8.1 major release, see
<A
HREF="release-8-1.html"
>Section E.169</A
>.
</P
><DIV
CLASS="SECT2"
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CLASS="SECT2"
><A
NAME="AEN135605"
>E.148.1. Migration to Version 8.1.21</A
></H2
><P
> A dump/restore is not required for those running 8.1.X.
However, if you are upgrading from a version earlier than 8.1.18,
see <A
HREF="release-8-1-18.html"
>Section E.151</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN135609"
>E.148.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Enforce restrictions in <TT
CLASS="LITERAL"
>plperl</TT
> using an opmask applied to
the whole interpreter, instead of using <TT
CLASS="FILENAME"
>Safe.pm</TT
>
(Tim Bunce, Andrew Dunstan)
</P
><P
> Recent developments have convinced us that <TT
CLASS="FILENAME"
>Safe.pm</TT
> is too
insecure to rely on for making <TT
CLASS="LITERAL"
>plperl</TT
> trustable. This
change removes use of <TT
CLASS="FILENAME"
>Safe.pm</TT
> altogether, in favor of using
a separate interpreter with an opcode mask that is always applied.
Pleasant side effects of the change include that it is now possible to
use Perl's <TT
CLASS="LITERAL"
>strict</TT
> pragma in a natural way in
<TT
CLASS="LITERAL"
>plperl</TT
>, and that Perl's <TT
CLASS="LITERAL"
>$a</TT
> and <TT
CLASS="LITERAL"
>$b</TT
>
variables work as expected in sort routines, and that function
compilation is significantly faster. (CVE-2010-1169)
</P
></LI
><LI
><P
> Prevent PL/Tcl from executing untrustworthy code from
<TT
CLASS="STRUCTNAME"
>pltcl_modules</TT
> (Tom)
</P
><P
> PL/Tcl's feature for autoloading Tcl code from a database table
could be exploited for trojan-horse attacks, because there was no
restriction on who could create or insert into that table. This change
disables the feature unless <TT
CLASS="STRUCTNAME"
>pltcl_modules</TT
> is owned by a
superuser. (However, the permissions on the table are not checked, so
installations that really need a less-than-secure modules table can
still grant suitable privileges to trusted non-superusers.) Also,
prevent loading code into the unrestricted <SPAN
CLASS="QUOTE"
>"normal"</SPAN
> Tcl
interpreter unless we are really going to execute a <TT
CLASS="LITERAL"
>pltclu</TT
>
function. (CVE-2010-1170)
</P
></LI
><LI
><P
> Do not allow an unprivileged user to reset superuser-only parameter
settings (Alvaro)
</P
><P
> Previously, if an unprivileged user ran <TT
CLASS="LITERAL"
>ALTER USER ... RESET
ALL</TT
> for himself, or <TT
CLASS="LITERAL"
>ALTER DATABASE ... RESET ALL</TT
> for
a database he owns, this would remove all special parameter settings
for the user or database, even ones that are only supposed to be
changeable by a superuser. Now, the <TT
CLASS="COMMAND"
>ALTER</TT
> will only
remove the parameters that the user has permission to change.
</P
></LI
><LI
><P
> Avoid possible crash during backend shutdown if shutdown occurs
when a <TT
CLASS="LITERAL"
>CONTEXT</TT
> addition would be made to log entries (Tom)
</P
><P
> In some cases the context-printing function would fail because the
current transaction had already been rolled back when it came time
to print a log message.
</P
></LI
><LI
><P
> Update pl/perl's <TT
CLASS="FILENAME"
>ppport.h</TT
> for modern Perl versions
(Andrew)
</P
></LI
><LI
><P
> Fix assorted memory leaks in pl/python (Andreas Freund, Tom)
</P
></LI
><LI
><P
> Prevent infinite recursion in <SPAN
CLASS="APPLICATION"
>psql</SPAN
> when expanding
a variable that refers to itself (Tom)
</P
></LI
><LI
><P
> Ensure that <TT
CLASS="FILENAME"
>contrib/pgstattuple</TT
> functions respond to cancel
interrupts promptly (Tatsuhito Kasahara)
</P
></LI
><LI
><P
> Make server startup deal properly with the case that
<CODE
CLASS="FUNCTION"
>shmget()</CODE
> returns <TT
CLASS="LITERAL"
>EINVAL</TT
> for an existing
shared memory segment (Tom)
</P
><P
> This behavior has been observed on BSD-derived kernels including OS X.
It resulted in an entirely-misleading startup failure complaining that
the shared memory request size was too large.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2010j
for DST law changes in Argentina, Australian Antarctic, Bangladesh,
Mexico, Morocco, Pakistan, Palestine, Russia, Syria, Tunisia;
also historical corrections for Taiwan.
</P
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