eventfd: provide a eventfdsignalmask() helper
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.10.162 by commit 4ef66581d7fdbd9bfe0b399c1a2479f8ea5cfdf0. For more details please see the references link.