SystemTap 1.0 when the --unprivileged option is used does not properly restrict certain data sizes which allows local users to (1) cause a denial of service or gain privileges via a print operation with a large number of arguments that trigger a kernel stack overflow (2) cause a denial of service via crafted DWARF expressions that trigger a kernel stack frame overflow or (3) cause a denial of service (infinite loop) via vectors that trigger creation of large unwind tables related to Common Information Entry (CIE) and Call Frame Instruction (CFI) records.