uutils/coreutils

dd: Silent Truncate Error Suppression

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#9,745 创建于 2025年12月20日

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 (4 评论) (0 反应) (0 负责人)Rust (23,246 star) (1,852 fork)batch import
U - ddgood first issuereported-canonical

描述

Component

dd

Description

If the output device is full, read-only, or otherwise unable to be truncated, dd reports success (exit 0) while leaving stale data in the output file.

Impact

Silent data corruption. Backup scripts relying on dd may believe a copy succeeded when it actually contains old/garbage data, leading to undetected data loss during recovery.

贡献者指南

技术栈
rust
领域
cli
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Rust programmingFile I/O conceptsError handling in Rustdd command behavior
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
60
研究方向
Investigate the dd implementation in the uutils/coreutils repository, focusing on the truncation logic. Look for where errors from truncation system calls are ignored or suppressed. Review existing tests for dd to understand expected behavior. Consider adding a test case that simulates a full output device or a read only file. The fix should ensure that truncation failures are propagated and lead to a non zero exit code.