On Thu, 2019-12-19 at 08:55 -0800, Lakshmi Ramasubramanian wrote: > I am not sure if the mutex can be removed. > > In ima_queue_key() we need to test the flag and add the key to the list > as an atomic operation: > > if (!test_bit()) > insert_key_to_list > > Suppose the if condition is true, but before we could insert the key to > the list, ima_process_queued_keys() runs and processes queued keys we'll > add the key to the list and never process it. > > Is there an API in the kernel to test and add an entry to a list > atomically? Ok, using test_and_set_bit() and test_bit() only helps, if we can get rid of the mutex. I'll queue these patches. thanks, Mimi
