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pidfd monitor can watch an unrelated process after host pid reuse

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#401 0 条评论 0 个 reaction 已指派 0 人 在 GitHub 查看

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还没有人认领这个 Issue。

评估

难度
4/5
预计耗时
3-5 天
新手友好度
45/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
c, macos
领域
operating-systems

调研方向

Start at pidfd_monitor_thread and trace pidfd_create through the kill(hpid, 0) check and kevent() registration, then inspect how the rest of the process layer tracks host pids. Reproduce or reason through host pid reuse during that gap; done means the pidfd cannot report or wait on an unrelated process.

由索引模型根据 Issue 内容生成。

描述

bug

pidfd_monitor_thread checks the target with kill(hpid, 0) and then registers EVFILT_PROC on hpid, the host pid recorded when the pidfd was created. If the target exits and macOS reuses that host pid before the monitor registers, the monitor ends up watching an unrelated process. The pidfd then reports the exit of that process, or waits on it, and not on the guest's target.

The window is between pidfd_create recording the host pid and the kevent() registration succeeding, so it needs fast pid reuse and is unlikely in practice. It is not specific to the pidfd table: anything in elfuse that holds a host pid across a gap has the same exposure, so the fix may belong with however the rest of the process layer tracks host pids.

Found while reviewing #399.

主要语言
C
星标
271
派生
28
平均合并
2 天 16 小时
30 天内合并 PR
20

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  3. Fork 仓库，在一个分支上完成修改。
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