In the Linux kernel, the following vulnerability has been resolved: tracing: Hold...

In the Linux kernel, the following vulnerability has been resolved:

tracing: Hold trace_types_lock when resetting last boot data from readers

update_last_data_if_empty() is called from tracing_open() with O_TRUNC, tracing_read_pipe() and tracing_buffers_read() without trace_types_lock. Two readers can both pass the LAST_BOOT test and free module_delta twice, and a module notifier can update module_delta while it is being freed.

Take trace_types_lock in those paths and keep the callers that already hold it on an unlocked variant.