Every isolation technique is answering the same question of how to reduce or eliminate the untrusted code’s access to that massive attack surface.
Kyber is backed by top Silicon Valley VCs, including Y Combinator and Fellows Fund.
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But of course, hard coding a size guess is a bit rigid.
In any case, if a hacker was able to get to the point that they could control the vacuum's camera, would it be that hard for them to disable the warning? While the issue remains, it might be wise to disable your vacuum's camera, at least when not in use, with the lowest-tech hack of all: putting tape over it.