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page about the maximum UTF8 sequence length we support (4 bytes since 8.1, 3 before that). pg_utf2wchar_with_len never got updated to support 4-byte characters at all, and in any case had a buffer-overrun risk in that it could produce multiple pg_wchars from what mblen claims to be just one UTF8 character. The only reason we don't have a major security hole is that most callers allocate worst-case output buffers; the sole exception in released versions appears to be pre-8.2 iwchareq() (ie, ILIKE), which can be crashed due to zeroing out its return address --- but AFAICS that can't be exploited for anything more than a crash, due to inability to control what gets written there. Per report from James Russell and Michael Fuhr. Pre-8.1 the risk is much less, but I still think pg_utf2wchar_with_len's behavior given an incomplete final character risks buffer overrun, so back-patch that logic change anyway. This patch also makes sure that UTF8 sequences exceeding the supported length (whichever it is) are consistently treated as error cases, rather than being treated like a valid shorter sequence in some places.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces including some of the more common listed below: C++ - http://thaiopensource.org/development/libpqxx/ JDBC - http://jdbc.postgresql.org ODBC - http://odbc.postgresql.org Perl - http://search.cpan.org/~dbdpg/ PHP - http://www.php.net Python - http://www.initd.org/ Ruby - http://ruby.scripting.ca/postgres/ Other language binding are available from a variety of contributing parties. PostgreSQL also has a great number of procedural languages available, a short but not complete list is below: PL/pgSQL - included in PostgreSQL source distribution PL/Perl - included in PostgreSQL source distribution PL/PHP - http://projects.commandprompt.com/projects/public/plphp PL/Python - included in PostgreSQL source distribution PL/Java - http://gborg.postgresql.org/project/pljava/projdisplay.php PL/Tcl - included in PostgreSQL source distribution See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.