diff options
| author | Rick Edgecombe <rick.p.edgecombe@intel.com> | 2023-06-12 17:10:45 -0700 |
|---|---|---|
| committer | Rick Edgecombe <rick.p.edgecombe@intel.com> | 2023-07-11 14:12:19 -0700 |
| commit | 00547ef73ff282eea59cd33b8952f1dcbb4bd4b8 (patch) | |
| tree | 44b4d897d275826d3df2e7fceb9b6e28b5a3b591 /mm/internal.h | |
| parent | ae1f05a617dcbc0a732fbeba0893786cd009536c (diff) | |
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
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/internal.h b/mm/internal.h index a7d9e980429a..018f5c342f90 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -538,14 +538,14 @@ static inline bool is_exec_mapping(vm_flags_t flags) } /* - * Stack area - automatically grows in one direction + * Stack area (including shadow stacks) * * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous: * do_mmap() forbids all other combinations. */ static inline bool is_stack_mapping(vm_flags_t flags) { - return (flags & VM_STACK) == VM_STACK; + return ((flags & VM_STACK) == VM_STACK) || (flags & VM_SHADOW_STACK); } /* |