Re: [PATCH v21 10/26] x86/mm: Update pte_modify for _PAGE_COW
From: Yu, Yu-cheng <hidden>
Date: 2021-03-08 16:52:37
Also in:
linux-arch, linux-doc, linux-mm, lkml
On 3/5/2021 6:29 AM, Borislav Petkov wrote:
On Wed, Feb 17, 2021 at 02:27:14PM -0800, Yu-cheng Yu wrote:quoted
@@ -787,16 +802,34 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) */ val &= _PAGE_CHG_MASK; val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK; + val = fixup_dirty_pte(val);Do I see it correctly that you can do here and below: /* * Fix up potential shadow stack page flags because the RO, Dirty PTE is * special. */ if (pte_dirty()) { pte_mkclean(); pte_mkdirty(); } ?
Yes, this looks better. Thanks!
That fixup thing looks grafted and not like a normal flow to me.