[PATCH v27 00/31] Control-flow Enforcement: Shadow Stack

From: Yu-cheng Yu
Date: Fri May 21 2021 - 18:13:10 EST

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

CET can protect applications and the kernel. This series enables only
application-level protection, and has three parts:

- Shadow stack [2],
- Indirect branch tracking [3], and
- Selftests [4].

I have run tests on these patches for quite some time, and they have been
very stable. Linux distributions with CET are available now, and Intel
processors with CET are already on the market. It would be nice if CET
support can be accepted into the kernel. I will be working to address any
issues should they come up.

Changes in v27:
- Eliminate signal context extension structure. Simplify signal handling.
- Add a new patch to move VM_UFFD_MINOR_BIT to 38.
- Smaller changes are in each patch's log.
- Rebase to Linus tree v5.13-rc2.

[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] Shadow Stack patches v26:

https://lore.kernel.org/r/20210427204315.24153-1-yu-cheng.yu@xxxxxxxxx/

[3] Indirect Branch Tracking patches v26

https://lore.kernel.org/r/20210427204720.25007-1-yu-cheng.yu@xxxxxxxxx/

[4] I am holding off the selftests changes and working to get Reviewed-by's.
The earlier version of the selftests patches:

https://lkml.kernel.org/r/20200521211720.20236-1-yu-cheng.yu@xxxxxxxxx/

[5] The kernel ptrace patch is tested with an Intel-internal updated GDB.
I am holding off the kernel ptrace patch to re-test it with my earlier
patch for fixing regset holes.

Yu-cheng Yu (31):
Documentation/x86: Add CET description
x86/cet/shstk: Add Kconfig option for Shadow Stack
x86/cpufeatures: Add CET CPU feature flags for Control-flow
Enforcement Technology (CET)
x86/cpufeatures: Introduce CPU setup and option parsing for CET
x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states
x86/cet: Add control-protection fault handler
x86/mm: Remove _PAGE_DIRTY from kernel RO pages
x86/mm: Move pmd_write(), pud_write() up in the file
x86/mm: Introduce _PAGE_COW
drm/i915/gvt: Change _PAGE_DIRTY to _PAGE_DIRTY_BITS
x86/mm: Update pte_modify for _PAGE_COW
x86/mm: Update ptep_set_wrprotect() and pmdp_set_wrprotect() for
transition from _PAGE_DIRTY to _PAGE_COW
mm: Move VM_UFFD_MINOR_BIT from 37 to 38
mm: Introduce VM_SHADOW_STACK for shadow stack memory
x86/mm: Shadow Stack page fault error checking
x86/mm: Update maybe_mkwrite() for shadow stack
mm: Fixup places that call pte_mkwrite() directly
mm: Add guard pages around a shadow stack.
mm/mmap: Add shadow stack pages to memory accounting
mm: Update can_follow_write_pte() for shadow stack
mm/mprotect: Exclude shadow stack from preserve_write
mm: Re-introduce vm_flags to do_mmap()
x86/cet/shstk: Add user-mode shadow stack support
x86/cet/shstk: Handle thread shadow stack
x86/cet/shstk: Introduce shadow stack token setup/verify routines
x86/cet/shstk: Handle signals for shadow stack
ELF: Introduce arch_setup_elf_property()
x86/cet/shstk: Add arch_prctl functions for shadow stack
mm: Move arch_calc_vm_prot_bits() to arch/x86/include/asm/mman.h
mm: Update arch_validate_flags() to test vma anonymous
mm: Introduce PROT_SHADOW_STACK for shadow stack

.../admin-guide/kernel-parameters.txt | 6 +
Documentation/filesystems/proc.rst | 1 +
Documentation/x86/index.rst | 1 +
Documentation/x86/intel_cet.rst | 136 +++++++
arch/arm64/include/asm/elf.h | 5 +
arch/arm64/include/asm/mman.h | 4 +-
arch/sparc/include/asm/mman.h | 4 +-
arch/x86/Kconfig | 24 ++
arch/x86/Kconfig.assembler | 5 +
arch/x86/ia32/ia32_signal.c | 25 +-
arch/x86/include/asm/cet.h | 53 +++
arch/x86/include/asm/cpufeatures.h | 2 +
arch/x86/include/asm/disabled-features.h | 8 +-
arch/x86/include/asm/elf.h | 11 +
arch/x86/include/asm/fpu/types.h | 23 +-
arch/x86/include/asm/fpu/xstate.h | 6 +-
arch/x86/include/asm/idtentry.h | 4 +
arch/x86/include/asm/mman.h | 88 +++++
arch/x86/include/asm/mmu_context.h | 3 +
arch/x86/include/asm/msr-index.h | 19 +
arch/x86/include/asm/page_types.h | 7 +
arch/x86/include/asm/pgtable.h | 299 +++++++++++++--
arch/x86/include/asm/pgtable_types.h | 48 ++-
arch/x86/include/asm/processor.h | 5 +
arch/x86/include/asm/special_insns.h | 30 ++
arch/x86/include/asm/trap_pf.h | 2 +
arch/x86/include/uapi/asm/mman.h | 28 +-
arch/x86/include/uapi/asm/prctl.h | 4 +
arch/x86/include/uapi/asm/processor-flags.h | 2 +
arch/x86/kernel/Makefile | 2 +
arch/x86/kernel/cet_prctl.c | 60 +++
arch/x86/kernel/cpu/common.c | 14 +
arch/x86/kernel/cpu/cpuid-deps.c | 2 +
arch/x86/kernel/fpu/xstate.c | 10 +-
arch/x86/kernel/idt.c | 4 +
arch/x86/kernel/process.c | 21 +-
arch/x86/kernel/process_64.c | 29 ++
arch/x86/kernel/shstk.c | 358 ++++++++++++++++++
arch/x86/kernel/signal.c | 13 +
arch/x86/kernel/signal_compat.c | 2 +-
arch/x86/kernel/traps.c | 63 +++
arch/x86/mm/fault.c | 19 +
arch/x86/mm/mmap.c | 48 +++
arch/x86/mm/pat/set_memory.c | 2 +-
arch/x86/mm/pgtable.c | 25 ++
drivers/gpu/drm/i915/gvt/gtt.c | 2 +-
fs/aio.c | 2 +-
fs/binfmt_elf.c | 4 +
fs/proc/task_mmu.c | 3 +
include/linux/elf.h | 6 +
include/linux/mm.h | 20 +-
include/linux/mman.h | 2 +-
include/linux/pgtable.h | 7 +
include/uapi/asm-generic/siginfo.h | 3 +-
include/uapi/linux/elf.h | 14 +
ipc/shm.c | 2 +-
mm/gup.c | 16 +-
mm/huge_memory.c | 27 +-
mm/memory.c | 5 +-
mm/migrate.c | 3 +-
mm/mmap.c | 17 +-
mm/mprotect.c | 11 +-
mm/nommu.c | 4 +-
mm/util.c | 2 +-
64 files changed, 1560 insertions(+), 115 deletions(-)
create mode 100644 Documentation/x86/intel_cet.rst
create mode 100644 arch/x86/include/asm/cet.h
create mode 100644 arch/x86/include/asm/mman.h
create mode 100644 arch/x86/kernel/cet_prctl.c
create mode 100644 arch/x86/kernel/shstk.c

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2.21.0