> What I'm more concerned about is what happens if you call mseal() on a > range and it can mseal a portion. Like, what happens to the first vma > in your test_seal_unmapped_middle case? I see it returns an error, but > is the first VMA mseal()'ed? (no it's not, but test that)
That is correct, Liam. Unix system calls must be atomic. They either return an error, and that is a promise they made no changes. Or they do the work required, and then return success. In OpenBSD, all mimmutable() aspects were carefully studied to gaurantee this behaviour. I am not an expert in the Linux kernel to make the assessment; someone who is qualified must make that assessment. Fuzzing with tests is a good way to judge it simpler.
