OpenBSD has:

Memory protection purify
 * W^X
 * .rodata segment
 * Guard pages
 * Randomized malloc()
 * Randomized mmap()
 * atexit() and stdio protection

In grsecurity there is PaX:

Can these features really prevent some exploits?

I tried to search equivalants in FreeBSD.

Greetings Willem Hendriks
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