Re: [PATCH v20 07/25] x86/mm: Remove _PAGE_DIRTY from kernel RO pages
From: Kees Cook <hidden>
Date: 2021-02-10 19:37:23
Also in:
linux-arch, linux-doc, linux-mm, lkml
On Wed, Feb 10, 2021 at 09:56:45AM -0800, Yu-cheng Yu wrote:
The x86 family of processors do not directly create read-only and Dirty PTEs. These PTEs are created by software. One such case is that kernel read-only pages are historically setup as Dirty. New processors that support Shadow Stack regard read-only and Dirty PTEs as shadow stack pages. This results in ambiguity between shadow stack and kernel read-only pages. To resolve this, removed Dirty from kernel read- only pages. Signed-off-by: Yu-cheng Yu <redacted>
Reviewed-by: Kees Cook <redacted> -- Kees Cook