Failed to stop overwriting a running binary

描述

$ stress -c 1 &
$ which stress
/usr/bin/stress
$ cp /bin/ls /usr/bin/stress
[1]+  Bus error               stress -c 1

$ stress -c 1 &
$ which stress
/usr/bin/stress
$ cp /bin/ls /usr/bin/stress
cp: cannot create regular file '/usr/bin/stress': Text file busy

贡献者指南

技术栈

go

领域

backendsecurity

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。

4

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。

1-2 days

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。

stale

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

GoLinux file system

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。

25

研究方向

Investigate how gVisor's runsc handles file writes to running binaries. The issue shows that runsc does not prevent overwriting an executing file, which should be blocked by the kernel. Look into the file operation implementations in the gVisor kernel, possibly in the pkg/sentry/fs/ directory. Check if there are any existing tests for ETXTBUSY behavior. Also review the comment thread for any clues from maintainers.