Cross-file intelligent contract reentrant vulnerability defense method and device

• Main Authors: YU WEIQIANG, WANG ZHONGRU, JIANG SHAOJIE
• Format: Patent
• Language: Chinese; English
• Published: 20.12.2019
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention discloses a cross-file intelligent contract reentrant vulnerability defense method, which comprises the following steps: when a to-be-detected intelligent contract enters a sensitive area determined by adopting a preset method, locking a sensitive variable of the sensitive area, the sensitive area comprising sensitive variables which can be read and written by functions in differentcode files; and when the to-be-detected smart contract leaves the sensitive area, performing unlocking processing on the sensitive variable. According to the defense method, when the to-be-detected smart contract enters the sensitive area, the sensitive variable is locked to prevent other smart contract files from tampering the sensitive variable, and when the to-be-detected smart contract leavesthe sensitive area, the sensitive variable is unlocked to execute other non-sensitive area services, thereby realizing defense of the reentrant vulnerability of the to-be-detected smart contract. 本发明公开了一种跨文件智能合约可重入漏洞防御方法，包括：当所