bpf: Skip task with pid=1 in sendsignalcommon()
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 v5.4.231 by commit 4923160393b06a34759a11b17930d71e06f396f2. For more details please see the references link.