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Exercise 1: Function Overridden Protection

The goal is to create a script that performs a feature that was not present in previous version of Solidity: function overriding protection.

exercises/exercise1/coin.sol contains a function that must never be overridden:

_mint(address dst, uint256 val)

Use Slither to ensure that no contract inheriting Coin overrides this function.

Use solc-select install 0.5.0 && solc-select use 0.5.0 to switch to solc 0.5.0

Proposed Algorithm

Get the Coin contract
    For each contract in the project:
        If Coin is in the list of inherited contracts:
            Get the _mint function
            If the contract declaring the _mint function is not Coin:
                A bug is found.

Tips

  • To get a specific contract, use slither.get_contract_from_name (note: it returns a list)
  • To get a specific function, use contract.get_function_from_signature

Solution

See exercises/exercise1/solution.py.