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Pardon my laziness to watch the whole video, but i guess there is no mention of this article i found pretty interesting a couple of years ago usenix.org/system/files/c
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in the q/a session you mention that there are no better HW CFI schemes proposed. there are some papers out there, e.g., doi.org/10.1145/285770 and some others for RISC-V. there is also a RISC-V WG forming to specify HW CFI (fwd+bwd). but yes, one shouldn't hold one's breath :)
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