Messages in this thread | | | Date | Wed, 10 Feb 2021 11:35:01 -0800 | From | Kees Cook <> | Subject | Re: [PATCH v20 07/25] x86/mm: Remove _PAGE_DIRTY from kernel RO pages |
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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 <yu-cheng.yu@intel.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-- Kees Cook
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