Tech: Shadow Stack and Landing Pads for Control Flow Integrity (SS-LP-CFI) tech-ss-lp-cfi@lists.riscv.org

The SS-LP-CFI task group will define privileged and unprivileged ISA extensions that can be used by privileged and unprivileged programs to protect the integrity of their control-flow. Specifically, for protecting backward-edges we will define a shadow stack for storing return-addresses in each privilege level. For protecting forward-edges we will design a flexible label based landing pads approach which will ensure that the execution adheres to the application’s Control-Flow Graph. The design will follow the threat model compiled in CFI-SIG and will be updated on demand.

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