Re: [PATCH v25 20/30] mm/mprotect: Exclude shadow stack from preserve_write

[Kirill A. Shutemov]

On Thu, Apr 15, 2021 at 03:14:09PM -0700, Yu-cheng Yu wrote:
> In change_pte_range(), when a PTE is changed for prot_numa, _PAGE_RW is
> preserved to avoid the additional write fault after the NUMA hinting fault.
> However, pte_write() now includes both normal writable and shadow stack
> (RW=0, Dirty=1) PTEs, but the latter does not have _PAGE_RW and has no need
> to preserve it.
> 
> Exclude shadow stack from preserve_write test, and apply the same change to
> change_huge_pmd().
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>

-- 
 Kirill A. Shutemov