Memory randomization as application security enhancement?

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It increases security by making it hard to predict where something will be in memory. Quite a few buffer overflow exploits work by putting (for example) the address of a known routine on the stack, and then returning to it. It’s much harder to do that without knowing the address of the relevant routine.

As far as I know, OpenBSD was about the first to do this, at least among the reasonably well-known OSes for PCs.

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