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Apples's M1 has an issue too: PACMAN

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Side channel attacks on the secure code execution are one thing and disabling caches and branch prediction might help with that but that isn't what the issue with what most people call speculative execution bugs.  That's where malicious code executing is able to read the memory or other state of the victim code even when it isn't executing.  To solve this you would have to turn off those features whenever executing any potentially malicious code.  That basically means everything. 


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