Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix deadlock between rcu_tasks_trace and event_mutex. Fix the following deadlock: CPU A _free_event() perf_kprobe_destroy() mutex_lock(&event_mutex) perf_trace_event_unreg() synchronize_rcu_tasks_trace() There are several paths where _free_event() grabs event_mutex and calls sync_rcu_tasks_trace. Above is one such case. CPU B bpf_prog_test_run_syscall() rcu_read_lock_trace() bpf_prog_run_pin_on_cpu() bpf_prog_load() bpf_tracing_func_proto() trace_set_clr_event() mutex_lock(&event_mutex) Delegate trace_set_clr_event() to workqueue to avoid such lock dependency.
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 255cbc9db7067a83713fd2f4b31034ddd266549a
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b5a528a34e1f613565115a7a6016862ccbfcb9ac
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c5c833f6375f8ecf9254dd27946c927c7d645421
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 45286680b385f2592db3003554872388dee66d68
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4580f4e0ebdf8dc8d506ae926b88510395a0c1d1
6.1.136
6.6.89
6.12.26
6.14.5
6.15
References
git.kernel.org/...c/255cbc9db7067a83713fd2f4b31034ddd266549a
git.kernel.org/...c/b5a528a34e1f613565115a7a6016862ccbfcb9ac
git.kernel.org/...c/c5c833f6375f8ecf9254dd27946c927c7d645421
git.kernel.org/...c/45286680b385f2592db3003554872388dee66d68
git.kernel.org/...c/4580f4e0ebdf8dc8d506ae926b88510395a0c1d1
