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So it only errors if you try to access a page in which no byte has been initialized ?

That is, if a program writes only to the 0th byte of a page, this tool won't warn on it reading from the 42nd byte ?

No it will still catch it if you access the 42nd byte with a read, but not if you write to any other byte first. Thats just a limitation of page faults and the information provided by userfaultfd.

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