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mm/mmap: Add shadow stack pages to memory accounting
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. Co-developed-by: Yu-cheng Yu <yu-cheng.yu@intel.com> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> Acked-by: David Hildenbrand <david@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> Link: https://lore.kernel.org/all/20230613001108.3040476-20-rick.p.edgecombe%40intel.com
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@ -538,14 +538,14 @@ static inline bool is_exec_mapping(vm_flags_t flags)
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}
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/*
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* Stack area - automatically grows in one direction
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* Stack area (including shadow stacks)
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*
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* VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
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* do_mmap() forbids all other combinations.
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*/
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static inline bool is_stack_mapping(vm_flags_t flags)
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{
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return (flags & VM_STACK) == VM_STACK;
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return ((flags & VM_STACK) == VM_STACK) || (flags & VM_SHADOW_STACK);
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}
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/*
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