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 (v7) of CET Shadow Stack patches is here: https://lkml.org/lkml/2019/6/6/1003 Summary of changes from v7: Rewrite ELF GNU property parsing (Patch #22). Look at PT_GNU_PROPERTY now. Rebase to v5.3-rc4. Small fixes in response to comments. 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: Introduce CET MSR system states 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 | 269 ++++++++++++++ arch/x86/Kconfig | 27 ++ 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/elf.h | 13 + arch/x86/include/asm/fpu/internal.h | 27 +- 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 | 169 +++++---- arch/x86/kernel/idt.c | 4 + arch/x86/kernel/process.c | 8 +- arch/x86/kernel/process_64.c | 41 +++ 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 | 20 ++ fs/gnu_property.c | 178 ++++++++++ fs/proc/task_mmu.c | 3 + include/asm-generic/pgtable.h | 33 ++ include/linux/elf.h | 11 + 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 +- 62 files changed, 1920 insertions(+), 166 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 -- 2.17.1
