Looks like the Linux malloc has no randomization or we can say has similar addresses between parent and child but it differs in the case of
Is my understanding correct?
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You should use github.com/GrapheneOS/har to get a better idea of how the baseline randomization works. It's focused on isolating each size class into separate regions. I recommend reading through github.com/GrapheneOS/har. It has fine-grained randomization, but it's not the focus.
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Randomization for large allocations (> 128k) is essentially complete: randomly sized guards and randomly delayed address space reuse. For small (slab) allocations, it has high entropy size class region randomization, slot randomization and randomly delayed reuse of slots/slabs.
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It doesn't implement random selection of slabs themselves yet other than the randomized reuse. This is what's still planned for fine-grained randomization:
github.com/GrapheneOS/har
github.com/GrapheneOS/har
github.com/GrapheneOS/har
Work has been focused on more important things.