Re: [PATCH v5 00/39] Shadow stacks for userspace
From: Mike Rapoport <rppt@kernel.org>
Date: 2023-01-22 08:20:49
Also in:
linux-api, linux-arch, linux-mm, lkml
On Thu, Jan 19, 2023 at 01:22:38PM -0800, Rick Edgecombe wrote:
Hi, This series implements Shadow Stacks for userspace using x86's Control-flow Enforcement Technology (CET). CET consists of two related security features: shadow stacks and indirect branch tracking. This series implements just the shadow stack part of this feature, and just for userspace.
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Previous version [1]. [0] https://lore.kernel.org/lkml/20220130211838.8382-1-rick.p.edgecombe@intel.com/ (local) [1] https://lore.kernel.org/lkml/20221203003606.6838-1-rick.p.edgecombe@intel.com/ (local) Kirill A. Shutemov (1): x86: Introduce userspace API for shadow stack Mike Rapoport (1): x86/shstk: Add ARCH_SHSTK_UNLOCK Rick Edgecombe (14): x86/fpu: Add helper for modifying xstate x86/mm: Introduce _PAGE_COW x86/mm: Start actually marking _PAGE_COW mm: Handle faultless write upgrades for shstk mm: Don't allow write GUPs to shadow stack memory x86/mm: Introduce MAP_ABOVE4G mm: Warn on shadow stack memory in wrong vma x86/shstk: Introduce map_shadow_stack syscall x86/shstk: Support WRSS for userspace x86: Expose thread features in /proc/$PID/status x86/shstk: Wire in shadow stack interface selftests/x86: Add shadow stack test x86/fpu: Add helper for initing features x86/shstk: Add ARCH_SHSTK_STATUS Yu-cheng Yu (23): Documentation/x86: Add CET shadow stack description x86/shstk: Add Kconfig option for shadow stack x86/cpufeatures: Add CPU feature flags for shadow stacks x86/cpufeatures: Enable CET CR4 bit for shadow stack x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states x86: Add user 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: 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: Check shadow stack page fault errors 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: Re-introduce vm_flags to do_mmap() x86/shstk: Add user-mode shadow stack support x86/shstk: Handle thread shadow stack x86/shstk: Introduce routines modifying shstk x86/shstk: Handle signals for shadow stack x86: Add PTRACE interface for shadow stack Documentation/filesystems/proc.rst | 1 + Documentation/x86/index.rst | 1 + Documentation/x86/shstk.rst | 176 +++++ arch/arm/kernel/signal.c | 2 +- arch/arm64/kernel/signal.c | 2 +- arch/arm64/kernel/signal32.c | 2 +- arch/sparc/kernel/signal32.c | 2 +- arch/sparc/kernel/signal_64.c | 2 +- arch/x86/Kconfig | 24 + arch/x86/Kconfig.assembler | 5 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + arch/x86/include/asm/cpufeatures.h | 2 + arch/x86/include/asm/disabled-features.h | 16 +- arch/x86/include/asm/fpu/api.h | 9 + arch/x86/include/asm/fpu/regset.h | 7 +- arch/x86/include/asm/fpu/sched.h | 3 +- arch/x86/include/asm/fpu/types.h | 16 +- arch/x86/include/asm/fpu/xstate.h | 6 +- arch/x86/include/asm/idtentry.h | 2 +- arch/x86/include/asm/mmu_context.h | 2 + arch/x86/include/asm/msr.h | 11 + arch/x86/include/asm/pgtable.h | 338 ++++++++- arch/x86/include/asm/pgtable_types.h | 65 +- arch/x86/include/asm/processor.h | 8 + arch/x86/include/asm/shstk.h | 40 ++ arch/x86/include/asm/special_insns.h | 13 + arch/x86/include/asm/tlbflush.h | 3 +- arch/x86/include/asm/trap_pf.h | 2 + arch/x86/include/asm/traps.h | 12 + arch/x86/include/uapi/asm/mman.h | 4 + arch/x86/include/uapi/asm/prctl.h | 12 + arch/x86/kernel/Makefile | 4 + arch/x86/kernel/cet.c | 152 ++++ arch/x86/kernel/cpu/common.c | 35 +- arch/x86/kernel/cpu/cpuid-deps.c | 1 + arch/x86/kernel/cpu/proc.c | 23 + arch/x86/kernel/fpu/core.c | 59 +- arch/x86/kernel/fpu/regset.c | 87 +++ arch/x86/kernel/fpu/xstate.c | 148 ++-- arch/x86/kernel/fpu/xstate.h | 6 + arch/x86/kernel/idt.c | 2 +- arch/x86/kernel/process.c | 18 +- arch/x86/kernel/process_64.c | 9 +- arch/x86/kernel/ptrace.c | 12 + arch/x86/kernel/shstk.c | 492 +++++++++++++ arch/x86/kernel/signal.c | 1 + arch/x86/kernel/signal_32.c | 2 +- arch/x86/kernel/signal_64.c | 8 +- arch/x86/kernel/sys_x86_64.c | 6 +- arch/x86/kernel/traps.c | 87 --- arch/x86/mm/fault.c | 38 + arch/x86/mm/pat/set_memory.c | 2 +- arch/x86/mm/pgtable.c | 6 + arch/x86/xen/enlighten_pv.c | 2 +- arch/x86/xen/xen-asm.S | 2 +- fs/aio.c | 2 +- fs/proc/array.c | 6 + fs/proc/task_mmu.c | 3 + include/linux/mm.h | 59 +- include/linux/mman.h | 4 + include/linux/pgtable.h | 35 + include/linux/proc_fs.h | 2 + include/linux/syscalls.h | 1 + include/uapi/asm-generic/siginfo.h | 3 +- include/uapi/asm-generic/unistd.h | 2 +- include/uapi/linux/elf.h | 2 + ipc/shm.c | 2 +- kernel/sys_ni.c | 1 + mm/gup.c | 2 +- mm/huge_memory.c | 12 +- mm/memory.c | 7 +- mm/migrate_device.c | 4 +- mm/mmap.c | 12 +- mm/nommu.c | 4 +- mm/userfaultfd.c | 10 +- mm/util.c | 2 +- tools/testing/selftests/x86/Makefile | 4 +- .../testing/selftests/x86/test_shadow_stack.c | 667 ++++++++++++++++++ 78 files changed, 2578 insertions(+), 259 deletions(-) create mode 100644 Documentation/x86/shstk.rst create mode 100644 arch/x86/include/asm/shstk.h create mode 100644 arch/x86/kernel/cet.c create mode 100644 arch/x86/kernel/shstk.c create mode 100644 tools/testing/selftests/x86/test_shadow_stack.c -- 2.17.1