Messages in this thread | | | Date | Mon, 22 Mar 2021 12:13:51 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCH v23 07/28] x86/mm: Remove _PAGE_DIRTY from kernel RO pages |
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On Tue, Mar 16, 2021 at 08:10:33AM -0700, 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> > Cc: "H. Peter Anvin" <hpa@zytor.com> > Cc: Kees Cook <keescook@chromium.org> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Dave Hansen <dave.hansen@linux.intel.com> > Cc: Christoph Hellwig <hch@lst.de> > Cc: Andy Lutomirski <luto@kernel.org> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: Borislav Petkov <bp@alien8.de> > Cc: Peter Zijlstra <peterz@infradead.org>
Looks good to me.
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
-- Kirill A. Shutemov
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