Messages in this thread | | | From | Yu-cheng Yu <> | Subject | [RFC PATCH v9 0/7] Control-flow Enforcement: Indirect Branch Tracking | Date | Wed, 5 Feb 2020 10:23:01 -0800 |
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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 is the second half of CET and enables Indirect Branch Tracking (IBT).
Changes from v8:
- Remove a patch that adds the legacy bitmap size to memory accounting, since the bitmap is now dynamically allocated. - Change the legacy bitmap from a pre-defined address to get_unmapped_area(). - Fix mis-handling of WAIT_ENDBR in signals - Split out PTRACE, VDSO, opcode map, and Makefile changes and submit separately.
[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] 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/
H.J. Lu (1): x86/cet/ibt: Add arch_prctl functions for Indirect Branch Tracking
Yu-cheng Yu (6): x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking x86/cet/ibt: User-mode Indirect Branch Tracking support x86/cet/ibt: Handle signals for Indirect Branch Tracking x86/cet/ibt: ELF header parsing for Indirect Branch Tracking mm: Update alloc_set_pte() for zero page x86/cet/ibt: Introduce arch_prctl(ARCH_X86_CET_MARK_LEGACY_CODE)
arch/x86/Kconfig | 17 ++ arch/x86/Makefile | 7 + arch/x86/include/asm/cet.h | 7 + arch/x86/include/asm/disabled-features.h | 8 +- arch/x86/include/uapi/asm/prctl.h | 3 + arch/x86/kernel/Makefile | 2 +- arch/x86/kernel/cet.c | 58 ++++- arch/x86/kernel/cet_bitmap.c | 226 ++++++++++++++++++ arch/x86/kernel/cet_prctl.c | 19 ++ arch/x86/kernel/cpu/common.c | 17 ++ arch/x86/kernel/fpu/signal.c | 8 +- arch/x86/kernel/process_64.c | 5 + mm/memory.c | 8 + .../arch/x86/include/asm/disabled-features.h | 8 +- 14 files changed, 385 insertions(+), 8 deletions(-) create mode 100644 arch/x86/kernel/cet_bitmap.c
-- 2.21.0
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