Messages in this thread | | | Date | Mon, 20 Mar 2023 11:55:27 +0100 | Subject | Re: [PATCH v8 17/40] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 | From | David Hildenbrand <> |
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On 19.03.23 01:15, Rick Edgecombe wrote: > From: Yu-cheng Yu <yu-cheng.yu@intel.com> > > The x86 Control-flow Enforcement Technology (CET) feature includes a new > type of memory called shadow stack. This shadow stack memory has some > unusual properties, which requires some core mm changes to function > properly. > > Future patches will introduce a new VM flag VM_SHADOW_STACK that will be > VM_HIGH_ARCH_BIT_5. VM_HIGH_ARCH_BIT_1 through VM_HIGH_ARCH_BIT_4 are > bits 32-36, and bit 37 is the unrelated VM_UFFD_MINOR_BIT. For the sake > of order, make all VM_HIGH_ARCH_BITs stay together by moving > VM_UFFD_MINOR_BIT from 37 to 38. This will allow VM_SHADOW_STACK to be > introduced as 37. > > Co-developed-by: Rick Edgecombe <rick.p.edgecombe@intel.com> > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> > Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> > Reviewed-by: Kees Cook <keescook@chromium.org> > Reviewed-by: Axel Rasmussen <axelrasmussen@google.com> > Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> > Acked-by: Peter Xu <peterx@redhat.com> > Tested-by: Pengfei Xu <pengfei.xu@intel.com> > Tested-by: John Allen <john.allen@amd.com> > Tested-by: Kees Cook <keescook@chromium.org> > ---
Reviewed-by: David Hildenbrand <david@redhat.com>
-- Thanks,
David / dhildenb
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