In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf\/core: Allow list_del during perf_event_overflow()<\/p>\n
A PMU might use perf_sched_cb_inc() and perf_sched_cb_dec()
\ninterface to get the PMU call back function pmu::sched_task
\ninvoked at schedule in and schedule out. This is achieved
\nby walking along the list anchored by sched_cb_list.<\/p>\n
The following scenario might lead to a list corruption.<\/p>\n
perf_pmu_sched_task()
\n for_each_list_entry(…, &sched_cb_list)
\n +–> __perf_pmu_sched_task()
\n +–> event->pmu->sched_task())
\n +–> PMU_push_sample()
\n +–> perf_event_overflow()
\n +–> __perf_event_overflow()
\n +–> pmu->stop()
\n +–> perf_sched_cb_dec()
\n remove entry from sched_cb_list
\n while list node in use.<\/p>\n
This happens when ioctl(fd, PERF_EVENT_IOC_REFRESH, xxx) has been
\ninvoked and perf_event::event_limit hits zero.<\/p>\n
Prevent the list corruption and convert for_each_list_entry()
\nto for_each_list_entry_safe().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf\/core: Allow list_del during perf_event_overflow()<\/p>\n
A PMU might use perf_sched_cb_inc() and perf_sched_cb_dec()
\ninterface to ge<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29117","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29117","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}