core/types: sanity check the basefee length inside a header #23171
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holiman
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Jul 6, 2021
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Are there any sanity checks around the max value of the tip akin to the old 500 gwei gasprice fat finger cap? |
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@tayvano Yes, the new tip estimator uses the exact same code as the old gas price estimator (just slightly modified to return a number without the base fee): https://github.com/ethereum/go-ethereum/blob/master/eth/gasprice/gasprice.go#L184 |
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EIP 1559 added a new unbounded type to the headers (base fee). This PR adds a meaningful can on top of it to prevent anyone from finding an ingenious way to do an amplification attack with junk basefees (with valid PoW).