[PATCH v7 00/27] Control-flow Enforcement: Shadow Stack

[Yu-cheng Yu]

Intel has published Control-flow Enforcement (CET) in the Architecture
Instruction Set Extensions Programming Reference:

  https://software.intel.com/en-us/download/intel-architecture-instruction-set-
  extensions-programming-reference

The previous version (v6) of CET Shadow Stack patches is here:

  https://lkml.org/lkml/2018/11/20/225

Summary of changes from v6:

  Rebase to v5.2-rc3.

  Adapt XSAVES system state changes to the recent FPU changes:
    - Add modify_fpu_regs_begin(), modify_fpu_regs_end() to protect
      CET MSR changes.
    - Update signal handling.

  Move ELF header-parsing out of x86.

  Other small fixes in response to comments.

This version passed GLIBC built-in tests.

Hi Maintainers,

What else is needed before this series can be merged?

Thanks,
Yu-cheng


Yu-cheng Yu (27):
  Documentation/x86: Add CET description
  x86/cpufeatures: Add CET CPU feature flags for Control-flow
    Enforcement Technology (CET)
  x86/fpu/xstate: Change names to separate XSAVES system and user states
  x86/fpu/xstate: Introduce XSAVES system states
  x86/fpu/xstate: Add XSAVES system states for shadow stack
  x86/cet: Add control protection exception handler
  x86/cet/shstk: Add Kconfig option for user-mode shadow stack
  mm: Introduce VM_SHSTK for shadow stack memory
  mm/mmap: Prevent Shadow Stack VMA merges
  x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW
  x86/mm: Introduce _PAGE_DIRTY_SW
  drm/i915/gvt: Update _PAGE_DIRTY to _PAGE_DIRTY_BITS
  x86/mm: Modify ptep_set_wrprotect and pmdp_set_wrprotect for
    _PAGE_DIRTY_SW
  x86/mm: Shadow stack page fault error checking
  mm: Handle shadow stack page fault
  mm: Handle THP/HugeTLB shadow stack page fault
  mm: Update can_follow_write_pte/pmd for shadow stack
  mm: Introduce do_mmap_locked()
  x86/cet/shstk: User-mode shadow stack support
  x86/cet/shstk: Introduce WRUSS instruction
  x86/cet/shstk: Handle signals for shadow stack
  binfmt_elf: Extract .note.gnu.property from an ELF file
  x86/cet/shstk: ELF header parsing of Shadow Stack
  x86/cet/shstk: Handle thread shadow stack
  mm/mmap: Add Shadow stack pages to memory accounting
  x86/cet/shstk: Add arch_prctl functions for Shadow Stack
  x86/cet/shstk: Add Shadow Stack instructions to opcode map

 .../admin-guide/kernel-parameters.txt         |   6 +
 Documentation/x86/index.rst                   |   1 +
 Documentation/x86/intel_cet.rst               | 268 +++++++++++++
 arch/x86/Kconfig                              |  26 ++
 arch/x86/Makefile                             |   7 +
 arch/x86/entry/entry_64.S                     |   2 +-
 arch/x86/ia32/ia32_signal.c                   |   8 +
 arch/x86/include/asm/cet.h                    |  48 +++
 arch/x86/include/asm/cpufeatures.h            |   2 +
 arch/x86/include/asm/disabled-features.h      |   8 +-
 arch/x86/include/asm/fpu/internal.h           |  25 +-
 arch/x86/include/asm/fpu/signal.h             |   2 +
 arch/x86/include/asm/fpu/types.h              |  22 ++
 arch/x86/include/asm/fpu/xstate.h             |  26 +-
 arch/x86/include/asm/mmu_context.h            |   3 +
 arch/x86/include/asm/msr-index.h              |  18 +
 arch/x86/include/asm/pgtable.h                | 191 ++++++++--
 arch/x86/include/asm/pgtable_types.h          |  38 +-
 arch/x86/include/asm/processor.h              |   5 +
 arch/x86/include/asm/special_insns.h          |  32 ++
 arch/x86/include/asm/traps.h                  |   5 +
 arch/x86/include/uapi/asm/prctl.h             |   5 +
 arch/x86/include/uapi/asm/processor-flags.h   |   2 +
 arch/x86/include/uapi/asm/sigcontext.h        |  15 +
 arch/x86/kernel/Makefile                      |   2 +
 arch/x86/kernel/cet.c                         | 327 ++++++++++++++++
 arch/x86/kernel/cet_prctl.c                   |  85 +++++
 arch/x86/kernel/cpu/common.c                  |  25 ++
 arch/x86/kernel/cpu/cpuid-deps.c              |   2 +
 arch/x86/kernel/fpu/core.c                    |  26 +-
 arch/x86/kernel/fpu/init.c                    |  10 -
 arch/x86/kernel/fpu/signal.c                  |  81 +++-
 arch/x86/kernel/fpu/xstate.c                  | 156 +++++---
 arch/x86/kernel/idt.c                         |   4 +
 arch/x86/kernel/process.c                     |   8 +-
 arch/x86/kernel/process_64.c                  |  31 ++
 arch/x86/kernel/relocate_kernel_64.S          |   2 +-
 arch/x86/kernel/signal.c                      |  10 +-
 arch/x86/kernel/signal_compat.c               |   2 +-
 arch/x86/kernel/traps.c                       |  57 +++
 arch/x86/kvm/vmx/vmx.c                        |   2 +-
 arch/x86/lib/x86-opcode-map.txt               |  26 +-
 arch/x86/mm/fault.c                           |  18 +
 arch/x86/mm/pgtable.c                         |  41 ++
 drivers/gpu/drm/i915/gvt/gtt.c                |   2 +-
 fs/Kconfig.binfmt                             |   3 +
 fs/Makefile                                   |   1 +
 fs/binfmt_elf.c                               |  13 +
 fs/gnu_property.c                             | 351 ++++++++++++++++++
 fs/proc/task_mmu.c                            |   3 +
 include/asm-generic/pgtable.h                 |  14 +
 include/linux/elf.h                           |  12 +
 include/linux/mm.h                            |  26 ++
 include/uapi/asm-generic/siginfo.h            |   3 +-
 include/uapi/linux/elf.h                      |  14 +
 mm/gup.c                                      |   8 +-
 mm/huge_memory.c                              |  12 +-
 mm/memory.c                                   |   7 +-
 mm/mmap.c                                     |  11 +
 .../arch/x86/include/asm/disabled-features.h  |   8 +-
 tools/objtool/arch/x86/lib/x86-opcode-map.txt |  26 +-
 61 files changed, 2029 insertions(+), 165 deletions(-)
 create mode 100644 Documentation/x86/intel_cet.rst
 create mode 100644 arch/x86/include/asm/cet.h
 create mode 100644 arch/x86/kernel/cet.c
 create mode 100644 arch/x86/kernel/cet_prctl.c
 create mode 100644 fs/gnu_property.c

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2.17.1