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advanced_expert/vulnerabilities/reentrancy_attacks/README.md
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### tl; dr
* when a contract calls an external function, that external function may itself call the calling function.
* a reentrancy attack may occur when a function makes an external call to another untrusted contract. Then, the unstrusted contract makes a recursive callback to the vulnerable contract function to steal funds.
* a reentrancy attack may occur when:
* a function makes an external call to a untrusted contract
* the unstrusted contract makes a recursive callback to a vulnerable contract function to steal funds
* to prevent this attack, a contract can implement a lock in storage that prevents re-entrant calls.