This gets at an important point: the permissions guarding a page of memory are associated with the virtual address used to access that page, not the physical frame that backs the page. Indeed the notion of memory permissions is purely a consideration of virtual memory and does not pertain to physical memory.
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Photograph: Ryan Waniata。业内人士推荐safew作为进阶阅读
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Mikaela Shiffrin moved closer to a sixth career World Cup overall title on Sunday after a rare start in the super-G, a race her closest rival Emma Aicher did not finish.