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by favorited
760 days ago
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Apple Silicon does this. If it prefetches something that looks like a pointer, it will also fetch the pointed-to memory. It's a cool feature, and is especially useful for Apple, since their Objective-C collections only store pointers – but it also can re-open the door for certain timing attacks by violating preconditions of constant-time cryptography algorithms. https://en.wikipedia.org/wiki/GoFetch |
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