We’ll understand overflow and underflow vulnerability of solidity by Solving Ethernaut’s : TOKEN Challenge. - blockchain smartcontracts
We’ll understand overflow and underflow vulnerability of solidity by Solving Ethernaut’sTOKEN Challenge. If you haven’t solved the Ethernaut Challenges already, but are planning to try it out, this might be a spoiler. Come back after solving the Token Challenge
And like for overflows, when a number underflows in solidity, it again doesn’t give any warnings or errors.Use vetted SafeMath libraries for arithmetic operations consistently throughout the smart contract system. It throws an error whenever there is an overflow or an underflow.The goal of this level is to hack the basic contract token below.
First of all, it’s not a good practice to have floating point caret in our pragma compiler. Make sure it is locked . Then we have two state variables — totalSupply & balances. Balances map addresses to units, showing the funds each address holds. And we have a constructor that takes a value & stores it in a state variable , which will be the funds mapped to the address of the contract deployer. .
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