On 2019-Jul-11, Thomas Munro wrote: > Following a trail of crumbs beginning at OpenSSH's fallback > implementation of this[1], I learned that C11 has standardised > memset_s[2] for this purpose. Macs have memset_s but no > explicit_bzero. FreeBSD has both. I wonder if it'd be better to make > memset_s the function we use in our code, considering its standard > blessing and therefore likelihood of being available on every system > eventually.
Sounds like a future-proof way would be to implement memset_s in src/port if absent from the OS (using explicit_bzero and other tricks), and use that. Here's a portable implementation (includes _WIN32 and NetBSD's explicit_memset) under ISC license: https://github.com/jedisct1/libsodium/blob/master/src/libsodium/sodium/utils.c#L112 (from https://www.cryptologie.net/article/419/zeroing-memory-compiler-optimizations-and-memset_s/ ) -- Álvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services