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    Indirect branch predictor storing encrypted branch information fields and security tag for security protection
    2.
    发明授权
    Indirect branch predictor storing encrypted branch information fields and security tag for security protection 有权

    公开(公告)号：US11449343B2

    公开(公告)日：2022-09-20

    申请号：US16220488

    申请日：2018-12-14

    Applicant: Apple Inc.

    Inventor： Jeffry E. Gonion ,  Ian D. Kountanis ,  Conrado Blasco ,  Steven Andrew Myers ,  Yannick L. Sierra

    IPC: G06F9/38 ,  G06F21/60 ,  G06F9/455 ,  G06F9/30

    Abstract: A system and method for efficiently protecting branch prediction information. In various embodiments, a computing system includes at least one processor with a branch predictor storing branch target addresses and security tags in a table. The security tag includes one or more components of machine context. When the branch predictor receives a portion of a first program counter of a first branch instruction, and hits on a first table entry during an access, the branch predictor reads out a first security tag. The branch predictor compares one or more components of machine context of the first security tag to one or more components of machine context of the first branch instruction. When there is at least one mismatch, the branch prediction information of the first table entry is not used. Additionally, there is no updating of any branch prediction training information of the first table entry.

    INDIRECT BRANCH PREDICTOR SECURITY PROTECTION
    3.
    发明申请
    INDIRECT BRANCH PREDICTOR SECURITY PROTECTION 有权

    公开(公告)号：US20230010948A1

    公开(公告)日：2023-01-12

    申请号：US17932883

    申请日：2022-09-16

    Applicant: Apple Inc.

    Inventor： Jeffry E. Gonion ,  Ian D. Kountanis ,  Conrado Blasco ,  Steven Andrew Myers ,  Yannick L. Sierra

    IPC: G06F9/38 ,  G06F21/60 ,  G06F9/455 ,  G06F9/30

    Abstract: A system and method for efficiently protecting branch prediction information. In various embodiments, a computing system includes at least one processor with a branch predictor storing branch target addresses and security tags in a table. The security tag includes one or more components of machine context. When the branch predictor receives a portion of a first program counter of a first branch instruction, and hits on a first table entry during an access, the branch predictor reads out a first security tag. The branch predictor compares one or more components of machine context of the first security tag to one or more components of machine context of the first branch instruction. When there is at least one mismatch, the branch prediction information of the first table entry is not used. Additionally, there is no updating of any branch prediction training information of the first table entry.

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