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【ima、selinux长稳】系统打印general protection fault后panic
Backlog
#IC7JAA
内核缺陷
hulk-robot
Opened this issue
2025-05-13 18:57
【严重程度】 严重 【特性】 【重现类型】 有条件必然重现 【定位分析】 并发执行load policy会触发general protection fault，导致内核panic。这是因为在执行list_replace_rcu替换链表ima_policy_rules中的结点的时候，当前进程将旧结点从链表中删除并设置old->prev = LIST_POISON2，如果另一个并行的进程已经持有旧结点，那么在list_replace_rcu的时候就会引用到毒药指针，造成内核panic。解决办法是在ima_lsm_update_rules函数中，为链表的遍历操作加mutex锁。ima_update_policy中也使用了ima_policy_rules链表，所以在其中链表写操作前加锁。 **二、缺陷分析结构反馈** 影响性分析说明： 缺陷严重等级:(Critical/High/Moderate/Low) 缺陷根因说明: 受影响版本排查(受影响/不受影响): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 修复是否涉及abi变化(是/否): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1
【严重程度】 严重 【特性】 【重现类型】 有条件必然重现 【定位分析】 并发执行load policy会触发general protection fault，导致内核panic。这是因为在执行list_replace_rcu替换链表ima_policy_rules中的结点的时候，当前进程将旧结点从链表中删除并设置old->prev = LIST_POISON2，如果另一个并行的进程已经持有旧结点，那么在list_replace_rcu的时候就会引用到毒药指针，造成内核panic。解决办法是在ima_lsm_update_rules函数中，为链表的遍历操作加mutex锁。ima_update_policy中也使用了ima_policy_rules链表，所以在其中链表写操作前加锁。 **二、缺陷分析结构反馈** 影响性分析说明： 缺陷严重等级:(Critical/High/Moderate/Low) 缺陷根因说明: 受影响版本排查(受影响/不受影响): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 修复是否涉及abi变化(是/否): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1
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