labath added a comment. I don't know about debugserver, but both lldb-server and gdbserver currently return an error when the memory is partially accessible, even though the protocol explicitly allows the possibility of truncated reads. It is somewhat hard to reproduce, because the caching mechanism in lldb aligns memory reads, and the cache "line" size is usually smaller than the page size -- which is probably why this behavior hasn't bothered anyone so far. Nonetheless, I would say that this behavior (not returning partial contents) is a (QoI) bug, but the fact that two stubs have it makes me wonder how many other stubs do the same as well..
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