[issue35537] use os.posix_spawn in subprocess

[Kyle Evans]

Kyle Evans <kevans at FreeBSD.org> added the comment:

I'll be preparing a patch for our posix_spawn's signal handling.

My mistake in my setuid assessment was pointed out to me- it doesn't seem like a highly likely attack vector, but it is indeed possible.

If the child errored out, they will indeed be properly reapable at that point due to how vfork is implemented -- any observation to the contrary is to be considered a bug.

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