denial-of-service

Denial-of-service risks in Solidity contracts stem from unbounded loops, failed external calls, and griefing, leading to gas exhaustion and degraded user experience when processing user-controlled lists.

Prevent gas exhaustion in Solidity iteration by favoring pull-based patterns where users claim rewards or state updates, and by implementing paginated processing for batch operations to stay within gas limits.

The pull pattern in Solidity allows users to claim rewards or state updates individually, preventing unbounded iteration and ensuring batch processing operations do not exceed block gas limits or block execution.

External calls cause denial-of-service in smart contracts when failures block execution, requiring guidance on handling failure scenarios to prevent griefing and ensure withdrawal mechanisms function properly under varying input sizes.

Pagination supports batch operations in Solidity by processing user-controlled lists in segments, ensuring operations stay within gas limits and preventing unbounded iteration that causes denial-of-service vulnerabilities.

Avoid on-chain loops over user data in smart contracts when input size can vary unpredictably, as unbounded iteration causes gas exhaustion; instead use pull-based patterns or paginated processing to prevent denial-of-service.