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    Subject[PATCH v12 1/8] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking
    Date
    Introduce Kconfig option X86_INTEL_BRANCH_TRACKING_USER.

    Indirect Branch Tracking (IBT) provides protection against CALL-/JMP-
    oriented programming attacks. It is active when the kernel has this
    feature enabled, and the processor and the application support it.
    When this feature is enabled, legacy non-IBT applications continue to
    work, but without IBT protection.

    Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
    ---
    v10:
    - Change build-time CET check to config depends on.

    arch/x86/Kconfig | 16 ++++++++++++++++
    1 file changed, 16 insertions(+)

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 6b6dad011763..b047e0a8d1c2 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -1963,6 +1963,22 @@ config X86_INTEL_SHADOW_STACK_USER

    If unsure, say y.

    +config X86_INTEL_BRANCH_TRACKING_USER
    + prompt "Intel Indirect Branch Tracking for user-mode"
    + def_bool n
    + depends on CPU_SUP_INTEL && X86_64
    + depends on $(cc-option,-fcf-protection)
    + select X86_INTEL_CET
    + help
    + Indirect Branch Tracking (IBT) provides protection against
    + CALL-/JMP-oriented programming attacks. It is active when
    + the kernel has this feature enabled, and the processor and
    + the application support it. When this feature is enabled,
    + legacy non-IBT applications continue to work, but without
    + IBT protection.
    +
    + If unsure, say y
    +
    config EFI
    bool "EFI runtime service support"
    depends on ACPI
    --
    2.21.0
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