CVE-2024-43869 (GCVE-0-2024-43869)
Vulnerability from cvelistv5
Published
2024-08-21 00:06
Modified
2025-11-03 22:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Fix event leak upon exec and file release The perf pending task work is never waited upon the matching event release. In the case of a child event, released via free_event() directly, this can potentially result in a leaked event, such as in the following scenario that doesn't even require a weak IRQ work implementation to trigger: schedule() prepare_task_switch() =======> <NMI> perf_event_overflow() event->pending_sigtrap = ... irq_work_queue(&event->pending_irq) <======= </NMI> perf_event_task_sched_out() event_sched_out() event->pending_sigtrap = 0; atomic_long_inc_not_zero(&event->refcount) task_work_add(&event->pending_task) finish_lock_switch() =======> <IRQ> perf_pending_irq() //do nothing, rely on pending task work <======= </IRQ> begin_new_exec() perf_event_exit_task() perf_event_exit_event() // If is child event free_event() WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1) // event is leaked Similar scenarios can also happen with perf_event_remove_on_exec() or simply against concurrent perf_event_release(). Fix this with synchonizing against the possibly remaining pending task work while freeing the event, just like is done with remaining pending IRQ work. This means that the pending task callback neither need nor should hold a reference to the event, preventing it from ever beeing freed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8bffa95ac19ff27c8261904f89d36c7fcf215d59
Version: 517e6a301f34613bff24a8e35b5455884f2d83d8
Version: 517e6a301f34613bff24a8e35b5455884f2d83d8
Version: 517e6a301f34613bff24a8e35b5455884f2d83d8
Version: 517e6a301f34613bff24a8e35b5455884f2d83d8
Version: 78e1317a174edbfd1182599bf76c092a2877672c
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