Re: [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
From: Dave Hansen <dave.hansen@linux.intel.com>
Date: 2018-07-17 23:15:14
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On 07/17/2018 04:03 PM, Yu-cheng Yu wrote:
We need to find a way to differentiate "someone can write to this PTE" from "the write bit is set in this PTE".
Please think about this: Should pte_write() tell us whether PTE.W=1, or should it tell us that *something* can write to the PTE, which would include PTE.W=0/D=1?