Memory Protection Keys for User pages is a CPU feature which will first appear on Skylake Servers, but will also be supported on future non-server parts. It provides a mechanism for enforcing page-based protections, but without requiring modification of the page tables when an application changes protection domains. See the Documentation/ patch for more details. Changes from RFCv3: * Added 'current' and 'foreign' variants of get_user_pages() to help indicate whether protection keys should be enforced. Thanks to Jerome Glisse for pointing out this issue. * Added "allocation" and set/get system calls so that we can do management of proection keys in the kernel. This opens the door to use of specific protection keys for kernel use in the future, such as for execute-only memory. * Removed the kselftest code for the moment. It will be submitted separately. Thanks Ingo and Thomas for most of these): Changes from RFCv2 (Thanks Ingo and Thomas for most of these): * few minor compile warnings * changed 'nopku' interaction with cpuid bits. Now, we do not clear the PKU cpuid bit, we just skip enabling it. * changed __pkru_allows_write() to also check access disable bit * removed the unused write_pkru() * made si_pkey a u64 and added some patch description details. Also made it share space in siginfo with MPX and clarified comments. * give some real text for the Processor Trace xsave state * made vma_pkey() less ugly (and much more optimized actually) * added SEGV_PKUERR to copy_siginfo_to_user() * remove page table walk when filling in si_pkey, added some big fat comments about it being inherently racy. * added self test code This code is not runnable to anyone outside of Intel unless they have some special hardware or a fancy simulator. If you are interested in running this for real, please get in touch with me. Hardware is available to a very small but nonzero number of people. This set is also available here (with the new syscall): git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-pkeys.git pkeys-v010 === diffstat === Documentation/kernel-parameters.txt | 3 + Documentation/x86/protection-keys.txt | 53 +++++ arch/mips/mm/gup.c | 3 +- arch/powerpc/include/asm/mman.h | 5 +- arch/powerpc/include/asm/mmu_context.h | 12 + arch/s390/include/asm/mmu_context.h | 12 + arch/s390/mm/gup.c | 3 +- arch/sh/mm/gup.c | 2 +- arch/sparc/mm/gup.c | 2 +- arch/unicore32/include/asm/mmu_context.h | 12 + arch/x86/Kconfig | 16 ++ arch/x86/entry/syscalls/syscall_32.tbl | 5 + arch/x86/entry/syscalls/syscall_64.tbl | 5 + arch/x86/include/asm/cpufeature.h | 54 +++-- arch/x86/include/asm/disabled-features.h | 12 + arch/x86/include/asm/fpu/types.h | 12 + arch/x86/include/asm/fpu/xstate.h | 4 +- arch/x86/include/asm/mmu.h | 7 + arch/x86/include/asm/mmu_context.h | 110 ++++++++- arch/x86/include/asm/pgtable.h | 38 +++ arch/x86/include/asm/pgtable_types.h | 34 ++- arch/x86/include/asm/pkeys.h | 68 ++++++ arch/x86/include/asm/required-features.h | 4 + arch/x86/include/asm/special_insns.h | 20 ++ arch/x86/include/uapi/asm/mman.h | 22 ++ arch/x86/include/uapi/asm/processor-flags.h | 2 + arch/x86/kernel/cpu/common.c | 42 ++++ arch/x86/kernel/fpu/xstate.c | 250 +++++++++++++++++++- arch/x86/kernel/ldt.c | 4 +- arch/x86/kernel/process_64.c | 2 + arch/x86/kernel/setup.c | 9 + arch/x86/mm/fault.c | 153 ++++++++++-- arch/x86/mm/gup.c | 52 ++-- arch/x86/mm/mpx.c | 4 +- drivers/char/agp/frontend.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 +- drivers/gpu/drm/i915/i915_gem_userptr.c | 2 +- drivers/gpu/drm/radeon/radeon_ttm.c | 4 +- drivers/gpu/drm/via/via_dmablit.c | 3 +- drivers/infiniband/core/umem.c | 2 +- drivers/infiniband/core/umem_odp.c | 8 +- drivers/infiniband/hw/mthca/mthca_memfree.c | 3 +- drivers/infiniband/hw/qib/qib_user_pages.c | 3 +- drivers/infiniband/hw/usnic/usnic_uiom.c | 2 +- drivers/iommu/amd_iommu_v2.c | 8 +- drivers/media/pci/ivtv/ivtv-udma.c | 4 +- drivers/media/pci/ivtv/ivtv-yuv.c | 10 +- drivers/media/v4l2-core/videobuf-dma-sg.c | 3 +- drivers/misc/sgi-gru/grufault.c | 3 +- drivers/scsi/st.c | 2 - drivers/staging/android/ashmem.c | 4 +- drivers/video/fbdev/pvr2fb.c | 4 +- drivers/virt/fsl_hypervisor.c | 5 +- fs/exec.c | 8 +- fs/proc/task_mmu.c | 5 + include/asm-generic/mm_hooks.h | 13 + include/linux/mm.h | 52 +++- include/linux/mman.h | 6 +- include/linux/pkeys.h | 59 +++++ include/uapi/asm-generic/mman-common.h | 5 + include/uapi/asm-generic/siginfo.h | 17 +- kernel/events/uprobes.c | 8 +- kernel/signal.c | 4 + mm/Kconfig | 13 + mm/frame_vector.c | 9 +- mm/gup.c | 153 ++++++------ mm/ksm.c | 10 +- mm/memory.c | 8 +- mm/mempolicy.c | 6 +- mm/mmap.c | 2 +- mm/mprotect.c | 134 ++++++++++- mm/nommu.c | 35 ++- mm/process_vm_access.c | 6 +- mm/util.c | 4 +- net/ceph/pagevec.c | 2 +- security/tomoyo/domain.c | 9 +- virt/kvm/async_pf.c | 2 +- virt/kvm/kvm_main.c | 13 +- 78 files changed, 1410 insertions(+), 285 deletions(-) Cc: linux-api@xxxxxxxxxxxxxxx Cc: linux-arch@xxxxxxxxxxxxxxx Cc: aarcange@xxxxxxxxxx Cc: akpm@xxxxxxxxxxxxxxxxxxxx Cc: jack@xxxxxxx Cc: kirill.shutemov@xxxxxxxxxxxxxxx Cc: linux-api@xxxxxxxxxxxxxxx Cc: linux-arch@xxxxxxxxxxxxxxx Cc: n-horiguchi@xxxxxxxxxxxxx Cc: x86@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
