The four process ID’s For each process, Lin­ux man­ages four UID’s. When a process from a user with UID 1000 is started/forked, then the new process has nor­mal­ly also the UID 1000. How­ev­er, with SUID/GUID it becomes more com­pli­cat­ed, since process­es can get oth­er UIDs than the one of the caller. When a process like passwd…