Aggressive randomisation of the stack location
Since 7.3 (03/19/2023), this will put the stack at a random location in the upper 1/4th of the userland virtual address space providing up to 26 additional bits of randomness in the address.
This aggressive randomisation of the stack location is for all 64-bit architectures except alpha.
This should make it harder for an attacker to find the stack.
Details:
- Mark Kettenis: aggresive randomisation of the stack location
- ‘Aggressively randomize the location of the stack’ - MARC
- OpenBSD 7.3