> Random-data memory: the ability to specify that a variable should be initialized at load time with random byte values (placed into a new ELF .openbsd.randomdata section) was implemented in OpenBSD 5.3 by Matthew Dempsky.

What's the use case for this?

EDIT: further down is one example:

> RETGUARD is a replacement for the stack-protector which uses a per-function random cookie (located in the read-only ELF .openbsd.randomdata section) to consistency-check the return address on the stack. Implemented for amd64 and arm64 by Todd Mortimer in OpenBSD 6.4, for mips64 in OpenBSD 6.7, and powerpc/powerpc64 in OpenBSD 6.9. amd64 system call stubs also protected in OpenBSD 7.3.