[RFC PATCH v9 00/27] Control-flow Enforcement: Shadow Stack

Yu-cheng Yu
2020-02-05T18:20:29Z

Control-flow Enforcement (CET) is a new Intel processor feature that blocks
return/jump-oriented programming attacks. Details can be found in "Intel
64 and IA-32 Architectures Software Developer's Manual" [1].

This series depends on the XSAVES supervisor state series that was split
out and submitted earlier [2].

Changes from v8:

- Simplify signal handling code.
- Add guard pages around a Shadow Stack.
- Replace ELF parser with Dave Martin's patch [3].

The goal of this posting is to seek additional comments.

[1] Intel 64 and IA-32 Architectures Software Developer's Manual:

https://software.intel.com/en-us/download/intel-64-and-ia-32-
architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4

[2] XSAVES supervisor states patches:
https://lkml.kernel.org/r/20200121201843.12047-1-yu-cheng.yu@intel.com/

[3] Dave Martin's ELF program property parsing patch:
https://lkml.kernel.org/r/20200122212144.6409-3-broonie@kernel.org/

[4] CET patches v8:

https://lkml.kernel.org/r/20190813205225.12032-1-yu-cheng.yu@intel.com/
https://lkml.kernel.org/r/20190813205359.12196-1-yu-cheng.yu@intel.com/

Dave Martin (1):
ELF: Add ELF program property parsing support

Yu-cheng Yu (26):
Documentation/x86: Add CET description
x86/cpufeatures: Add CET CPU feature flags for Control-flow
Enforcement Technology (CET)
x86/fpu/xstate: Introduce CET MSR XSAVES supervisor states
x86/cet: Add control-protection fault handler
x86/cet/shstk: Add Kconfig option for user-mode Shadow Stack
protection
mm: Introduce VM_SHSTK for Shadow Stack memory
Add guard pages around a Shadow Stack.
x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW
x86/mm: Introduce _PAGE_DIRTY_SW
x86/mm: Update pte_modify, pmd_modify, and _PAGE_CHG_MASK for
_PAGE_DIRTY_SW
drm/i915/gvt: Change _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() for Shadow Stack
x86/cet/shstk: User-mode Shadow Stack support
x86/cet/shstk: Introduce WRUSS instruction
x86/cet/shstk: Handle signals for Shadow Stack
ELF: UAPI and Kconfig additions for ELF program properties
binfmt_elf: Define GNU_PROPERTY_X86_FEATURE_1_AND
ELF: Introduce arch_setup_elf_property()
x86/cet/shstk: ELF header parsing for 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

.../admin-guide/kernel-parameters.txt | 6 +
Documentation/x86/index.rst | 1 +
Documentation/x86/intel_cet.rst | 294 +++++++++++++++
arch/x86/Kconfig | 24 ++
arch/x86/Makefile | 7 +
arch/x86/entry/entry_64.S | 2 +-
arch/x86/ia32/ia32_signal.c | 17 +
arch/x86/include/asm/cet.h | 44 +++
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 | 2 +
arch/x86/include/asm/fpu/types.h | 22 ++
arch/x86/include/asm/fpu/xstate.h | 5 +-
arch/x86/include/asm/mmu_context.h | 3 +
arch/x86/include/asm/msr-index.h | 18 +
arch/x86/include/asm/pgtable.h | 197 +++++++++-
arch/x86/include/asm/pgtable_types.h | 50 ++-
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 | 9 +
arch/x86/kernel/Makefile | 2 +
arch/x86/kernel/cet.c | 344 ++++++++++++++++++
arch/x86/kernel/cet_prctl.c | 84 +++++
arch/x86/kernel/cpu/common.c | 25 ++
arch/x86/kernel/cpu/cpuid-deps.c | 2 +
arch/x86/kernel/fpu/signal.c | 89 +++++
arch/x86/kernel/fpu/xstate.c | 25 +-
arch/x86/kernel/idt.c | 4 +
arch/x86/kernel/process.c | 12 +-
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 | 59 +++
arch/x86/kvm/vmx/vmx.c | 2 +-
arch/x86/mm/fault.c | 18 +
arch/x86/mm/mmap.c | 2 +
arch/x86/mm/pgtable.c | 41 +++
drivers/gpu/drm/i915/gvt/gtt.c | 2 +-
fs/Kconfig.binfmt | 3 +
fs/binfmt_elf.c | 131 +++++++
fs/compat_binfmt_elf.c | 4 +
fs/proc/task_mmu.c | 3 +
include/asm-generic/pgtable.h | 40 ++
include/linux/elf.h | 33 ++
include/linux/mm.h | 28 +-
include/uapi/asm-generic/siginfo.h | 3 +-
include/uapi/linux/elf.h | 12 +
mm/gup.c | 8 +-
mm/huge_memory.c | 12 +-
mm/memory.c | 7 +-
mm/mmap.c | 5 +
.../arch/x86/include/asm/disabled-features.h | 8 +-
57 files changed, 1779 insertions(+), 47 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

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2.21.0