i#3556 w^x: Handle fork races #3659
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Changes how fork is handled to avoid races. Now the parent makes an anonymous private temporary copy of vmcode pre-fork, freeing it post-fork. The child sets up its new mappings from the temporary copy, avoiding any issues with copying the parent's live data. Adds a sanity fork regression test. Issue: #3556
…^X can remove +x from +wx temp copy)
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Changes how fork is handled to avoid races. Now the parent makes an
anonymous private temporary copy of vmcode pre-fork, freeing it
post-fork. The child sets up its new mappings from the temporary
copy, avoiding any issues with copying the parent's live data.
Adds a sanity fork regression test.
Issue: #3556