恢复“sched/fair:确保尝试分离至少一个可移动任务”(CVE-2024-42245)

admin 2024-08-10 12:24:59 Ali_nvd 来源:ZONE.CI 全球网 0 阅读模式
恢复“sched/fair:确保尝试分离至少一个可移动任务”(CVE-2024-42245)

CVE编号

CVE-2024-42245

利用情况

暂无

补丁情况

N/A

披露时间

2024-08-08
漏洞描述
In the Linux kernel, the following vulnerability has been resolved: Revert "sched/fair: Make sure to try to detach at least one movable task" This reverts commit b0defa7ae03ecf91b8bfd10ede430cff12fcbd06. b0defa7ae03ec changed the load balancing logic to ignore env.max_loop if all tasks examined to that point were pinned. The goal of the patch was to make it more likely to be able to detach a task buried in a long list of pinned tasks. However, this has the unfortunate side effect of creating an O(n) iteration in detach_tasks(), as we now must fully iterate every task on a cpu if all or most are pinned. Since this load balance code is done with rq lock held, and often in softirq context, it is very easy to trigger hard lockups. We observed such hard lockups with a user who affined O(10k) threads to a single cpu. When I discussed this with Vincent he initially suggested that we keep the limit on the number of tasks to detach, but increase the number of tasks we can search. However, after some back and forth on the mailing list, he recommended we instead revert the original patch, as it seems likely no one was actually getting hit by the original issue.
解决建议
建议您更新当前系统或软件至最新版,完成漏洞的修复。
参考链接
https://git.kernel.org/stable/c/0fa6dcbfa2e2b97c1e6febbea561badf0931a38b
https://git.kernel.org/stable/c/1e116c18e32b035a2d1bd460800072c8bf96bc44
https://git.kernel.org/stable/c/2feab2492deb2f14f9675dd6388e9e2bf669c27a
https://git.kernel.org/stable/c/d467194018dd536fe6c65a2fd3aedfcdb1424903
受影响软件情况
# 类型 厂商 产品 版本 影响面
1
运行在以下环境
系统 debian_11 linux * Up to (excluding) 5.10.221-1
运行在以下环境
系统 linux linux_kernel * From (including) 6.1 Up to (excluding) 6.1.100
运行在以下环境
系统 linux linux_kernel * From (including) 6.2 Up to (excluding) 6.6.41
运行在以下环境
系统 linux linux_kernel * From (including) 6.7 Up to (excluding) 6.9.10
CVSS3评分 5.5
  • 攻击路径 本地
  • 攻击复杂度 低
  • 权限要求 低
  • 影响范围 未更改
  • 用户交互 无
  • 可用性 高
  • 保密性 无
  • 完整性 无
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-ID 漏洞类型
CWE-667 加锁机制不恰当
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