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    Subject[PATCH v19 5/7] x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking
    Date
    From: "H.J. Lu" <hjl.tools@gmail.com>

    Update ARCH_X86_CET_STATUS and ARCH_X86_CET_DISABLE for Indirect Branch
    Tracking.

    Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
    Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
    ---
    arch/x86/kernel/cet_prctl.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/arch/x86/kernel/cet_prctl.c b/arch/x86/kernel/cet_prctl.c
    index 0030c63a08c0..4df1eac41965 100644
    --- a/arch/x86/kernel/cet_prctl.c
    +++ b/arch/x86/kernel/cet_prctl.c
    @@ -22,6 +22,9 @@ static int cet_copy_status_to_user(struct cet_status *cet, u64 __user *ubuf)
    buf[2] = cet->shstk_size;
    }

    + if (cet->ibt_enabled)
    + buf[0] |= GNU_PROPERTY_X86_FEATURE_1_IBT;
    +
    return copy_to_user(ubuf, buf, sizeof(buf));
    }

    @@ -46,6 +49,8 @@ int prctl_cet(int option, u64 arg2)
    return -EINVAL;
    if (arg2 & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
    cet_disable_shstk();
    + if (arg2 & GNU_PROPERTY_X86_FEATURE_1_IBT)
    + cet_disable_ibt();
    return 0;

    case ARCH_X86_CET_LOCK:
    --
    2.21.0
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