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Per the fgets() specification, it cannot return without reading some data unless it reports EOF or error. So the code here assumed that the data buffer would necessarily be nonempty when we go to check for a newline having been read. However, Agostino Sarubbo noticed that this could fail to be true if the first byte of the data is a NUL (\0). The fgets() API doesn't really work for embedded NULs, which is something I don't feel any great need for us to worry about since we generally don't allow NULs in SQL strings anyway. But we should not access off the end of our own buffer if the case occurs. Normally this would just be a harmless read, but if you were unlucky the byte before the buffer would contain '\n' and we'd overwrite it with '\0', and if you were really unlucky that might be valuable data and psql would crash. Agostino reported this to pgsql-security, but after discussion we concluded that it isn't worth treating as a security bug; if you can control the input to psql you can do far more interesting things than just maybe-crash it. Nonetheless, it is a bug, so back-patch to all supported versions. |
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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, many of which are listed here: http://www.postgresql.org/download 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. 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/.