sched/core:修复 dup_user_cpus_ptr() 中的 use-after-free 错误 (CVE-2022-48892)

admin 2024-08-23 00:25:54 Ali_nvd 来源:ZONE.CI 全球网 0 阅读模式
sched/core:修复 dup_user_cpus_ptr() 中的 use-after-free 错误 (CVE-2022-48892)

CVE编号

CVE-2022-48892

利用情况

暂无

补丁情况

N/A

披露时间

2024-08-21
漏洞描述
In the Linux kernel, the following vulnerability has been resolved: sched/core: Fix use-after-free bug in dup_user_cpus_ptr() Since commit 07ec77a1d4e8 ("sched: Allow task CPU affinity to be restricted on asymmetric systems"), the setting and clearing of user_cpus_ptr are done under pi_lock for arm64 architecture. However, dup_user_cpus_ptr() accesses user_cpus_ptr without any lock protection. Since sched_setaffinity() can be invoked from another process, the process being modified may be undergoing fork() at the same time. When racing with the clearing of user_cpus_ptr in __set_cpus_allowed_ptr_locked(), it can lead to user-after-free and possibly double-free in arm64 kernel. Commit 8f9ea86fdf99 ("sched: Always preserve the user requested cpumask") fixes this problem as user_cpus_ptr, once set, will never be cleared in a task's lifetime. However, this bug was re-introduced in commit 851a723e45d1 ("sched: Always clear user_cpus_ptr in do_set_cpus_allowed()") which allows the clearing of user_cpus_ptr in do_set_cpus_allowed(). This time, it will affect all arches. Fix this bug by always clearing the user_cpus_ptr of the newly cloned/forked task before the copying process starts and check the user_cpus_ptr state of the source task under pi_lock. Note to stable, this patch won't be applicable to stable releases. Just copy the new dup_user_cpus_ptr() function over.
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/7b5cc7fd1789ea5dbb942c9f8207b076d365badc
https://git.kernel.org/stable/c/87ca4f9efbd7cc649ff43b87970888f2812945b8
https://git.kernel.org/stable/c/b22faa21b6230d5eccd233e1b7e0026a5002b287
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) 5.10.223-1
运行在以下环境
系统 debian_12 linux * Up to (excluding) 6.1.7-1
CVSS3评分 N/A
  • 攻击路径 N/A
  • 攻击复杂度 N/A
  • 权限要求 N/A
  • 影响范围 N/A
  • 用户交互 N/A
  • 可用性 N/A
  • 保密性 N/A
  • 完整性 N/A
N/A
CWE-ID 漏洞类型
- avd.aliyun.com
weinxin
版权声明
本站原创文章转载请注明文章出处及链接,谢谢合作!
评论:0   参与:  0