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> Isn't that the default?

Yes, it is, and for good reasons. That's why I disagreed with the original "An unprivileged userspace application, even if coded poorly, shouldn't crash the machine" part.

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I don't follow. The default today is that an unprivileged user space application should not crash the machine. The kernel reserves what it needs, then hands the rest to user space. Thus, all available memory should not crash the machine.

https://en.wikipedia.org/wiki/User_space_and_kernel_space

https://en.wikipedia.org/wiki/Virtual_memory

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