There's a new mmap option MAP_FIXED_NOREPLACE added in the Linux 4.17 kernel. This will check if the requested mapping overlaps any existing maps and fail if so, allowing fixed address mappings to be used more safely. Funny to see since we already worked around this danger in LMDB a long time ago.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

As usual, adding more stuff to the kernel even though userland solutions already existed.