公开(公告)号：US20210303304A1

公开(公告)日：2021-09-30

申请号：US16833599

申请日：2020-03-28

Applicant: Intel Corporation

Inventor： Vedvyas SHANBHOQUE ,  Gilbert NEIGER ,  Deepak K. GUPTA ,  H. Peter ANVIN

IPC: G06F9/30 ,  G06F9/48 ,  G06F9/54 ,  G06F16/176

Abstract: An apparatus and method for efficiently managing shadow stacks. For example, one embodiment of a processor comprises: a plurality of registers to store a plurality of shadow stack pointers (SSPs), each SSP associated with a different event priority; event processing circuitry to select a first SSP of the plurality of SSPs from a first register of the plurality of registers responsive to receipt of a first event associated with a first event priority level, the first SSP usable to identify a top of a first shadow stack; verification and utilization checking circuitry to determine whether the first SSP has been previously verified, wherein if the first SSP has not been previously verified then initiating a set of atomic operations to verify the first SSP and confirm that the first SSP is not in use, the set of atomic operations using a locking operation to lock data until the set of atomic operations are complete, and wherein if the first SSP has been previously verified, then re-verifying the first SSP and confirming that the first SSP is not in use without using the locking operation.