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

貢獻者指南

技術棧

go

領域

backendsecurity

議題類型

bug

難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。

4

預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。

1-2 days

活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。

stale

清晰度議題是否清楚說明預期改動、驗收標準和下一步。

clear

前置要求

GoLinux file system

新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。

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.