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]. This is the second part of CET and enables Indirect Branch Tracking (IBT). It is built on top of the shadow stack series. Changes in v23: - Add patch #6: introduce a macro for ENDBR instructions. - Patch #7: replace endbr32 with ENDBR macro. - Patch #9: revise, add/replace endbr64 with ENDBR macro. - Rebase to Linus tree v5.12-rc3. [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] Indirect Branch Tracking patches v22: https://lore.kernel.org/r/20210310220519.16811-1-yu-cheng.yu@xxxxxxxxx/ H.J. Lu (3): x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking x86/vdso/32: Add ENDBR to __kernel_vsyscall entry point x86/vdso: Insert endbr32/endbr64 to vDSO Yu-cheng Yu (6): x86/cet/ibt: Update Kconfig 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: Update ELF header parsing for Indirect Branch Tracking x86/entry: Introduce ENDBR macro x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave arch/x86/Kconfig | 1 + arch/x86/entry/calling.h | 18 ++++++++ arch/x86/entry/vdso/Makefile | 4 ++ arch/x86/entry/vdso/vdso32/system_call.S | 2 + arch/x86/entry/vdso/vsgx.S | 4 ++ arch/x86/include/asm/cet.h | 3 ++ arch/x86/kernel/cet.c | 59 +++++++++++++++++++++++- arch/x86/kernel/cet_prctl.c | 5 ++ arch/x86/kernel/fpu/signal.c | 8 ++-- arch/x86/kernel/process_64.c | 8 ++++ 10 files changed, 107 insertions(+), 5 deletions(-) -- 2.21.0