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JosJuice
d2f7ed3602
If (offset + size) % BLOCK_SIZE was smaller than offset % BLOCK_SIZE, the loop terminated one iteration too early, potentially leaving a block read-only. None of the existing users of LazyMemoryRegion could trigger this bug, because they never made EnsureMemoryPagesWritable calls that straddled across two blocks, but the next commit will add a new use that does.