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The header comment for this file says it assumes that "the CPU is not picky about alignment", which we wouldn't really accept for Postgres. The two functions that have alignment requirements have been hacked in ways that are inconsistent and yet both ugly. des_setkey just casts its "const char *" argument to "const uint32 *", relying on the caller to ensure that that pointer is actually word-aligned, which the caller does by declaring the buffer as uint32[] and then casting to "char *". Meanwhile des_cipher carefully memcpy's to and from an internal uint32[] buffer, which is pretty silly given that what it's passed must be word-aligned for the benefit of des_setkey. And on top of that we have a bunch of ugly casting and oddly-written pointer arithmetic in the caller px_crypt_des. The odd pointer arithmetic causes warnings about possible buffer overrun when using recent gcc at -O3 or higher. Let's clean this up by converting the buffer variable into a union of a uint8 array and a uint32 array, so that we can remove all these casts, and also replace the strange loop logic with a simple subscript variable to satisfy gcc. Reported-by: Andres Freund <andres@anarazel.de> Author: Tom Lane <tgl@sss.pgh.pa.us> Co-authored-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com> Discussion: https://postgr.es/m/2005885.1790359097@sss.pgh.pa.us Discussion: https://postgr.es/m/3nuudxv365kjnmwjhnygdakhxuktpdjvf26rt26eb44esgqdrj@y2x3vomkrfoo Backpatch-through: 14
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.