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I happened to notice that if compiled --with-gssapi, 9.6's contrib/pgcrypto tests report memory stomps for some SHA operations. Both MEMORY_CONTEXT_CHECKING and valgrind agree there's a problem, though nothing crashes; it appears that the buffer overrun only extends into alignment padding, at least on 64-bit hardware. Investigation found that pgcrypto's references to SHA224_Init et al were being captured by the system OpenSSL library, which of course has slightly incompatible definitions of those functions. We long ago noticed this problem with respect to the sibling functions SHA256_Init and so on, and commit 56f44784f introduced renaming macros to dodge the problem for those. However, it didn't cover the SHA224 family because we didn't use that at the time. When commit 1abf76e82 added those awhile later, it neglected to add a similar renaming macro. Better late than never, so do so now. This appears to affect all branches 8.2 - 9.6, so it's surprising nobody noticed before now. Maybe the effect is somehow specific to the way RHEL8 intertwines its GSS and SSL libraries? Anyway, we refactored all this stuff in v10, so newer branches don't have the problem.
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/.