Well, i believe, fork'ed processes should not share any memory between each other. Linux 2.6 behaviour looks correct.
Most modern OSes, including Linux, use a copy-on-write scheme: the two processes initially share each page of memory, but the first attempt to write to such a page is detected by the MMU (memory management unit) hardware, and the page is invisibly copied. This is why fork is so fast.

Dave.

In reply to Re^2: fork on linux 2.6 does not share memory by dave_the_m
in thread fork on linux 2.6 does not share memory by tinita

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