Re: [PATCH v4 13/39] x86/mm: Start actually marking _PAGE_COW

[Kees Cook]

On Fri, Dec 02, 2022 at 04:35:40PM -0800, Rick Edgecombe wrote:
> The recently introduced _PAGE_COW should be used instead of the HW Dirty
> bit whenever a PTE is Write=0, in order to not inadvertently create
> shadow stack PTEs. Update pte_mk*() helpers to do this, and apply the same
> changes to pmd and pud.
> 
> Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
> Tested-by: John Allen <john.allen@xxxxxxx>
> Co-developed-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook