1 { 2 "bounded loop, count to 4", 3 .insns = { 4 BPF_MOV64_IMM(BPF_REG_0, 0), 5 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 6 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2), 7 BPF_EXIT_INSN(), 8 }, 9 .result = ACCEPT, 10 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 11 .retval = 4, 12 }, 13 { 14 "bounded loop, count to 20", 15 .insns = { 16 BPF_MOV64_IMM(BPF_REG_0, 0), 17 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 3), 18 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 20, -2), 19 BPF_EXIT_INSN(), 20 }, 21 .result = ACCEPT, 22 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 23 }, 24 { 25 "bounded loop, count from positive unknown to 4", 26 .insns = { 27 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32), 28 BPF_JMP_IMM(BPF_JSLT, BPF_REG_0, 0, 2), 29 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 30 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2), 31 BPF_EXIT_INSN(), 32 }, 33 .result = ACCEPT, 34 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 35 .retval = 4, 36 }, 37 { 38 "bounded loop, count from totally unknown to 4", 39 .insns = { 40 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32), 41 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 42 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2), 43 BPF_EXIT_INSN(), 44 }, 45 .result = ACCEPT, 46 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 47 }, 48 { 49 "bounded loop, count to 4 with equality", 50 .insns = { 51 BPF_MOV64_IMM(BPF_REG_0, 0), 52 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 53 BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, -2), 54 BPF_EXIT_INSN(), 55 }, 56 .result = ACCEPT, 57 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 58 }, 59 { 60 "bounded loop, start in the middle", 61 .insns = { 62 BPF_MOV64_IMM(BPF_REG_0, 0), 63 BPF_JMP_A(1), 64 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 65 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2), 66 BPF_EXIT_INSN(), 67 }, 68 .result = REJECT, 69 .errstr = "back-edge", 70 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 71 .retval = 4, 72 }, 73 { 74 "bounded loop containing a forward jump", 75 .insns = { 76 BPF_MOV64_IMM(BPF_REG_0, 0), 77 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 78 BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_0, 0), 79 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -3), 80 BPF_EXIT_INSN(), 81 }, 82 .result = ACCEPT, 83 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 84 .retval = 4, 85 }, 86 { 87 "bounded loop that jumps out rather than in", 88 .insns = { 89 BPF_MOV64_IMM(BPF_REG_6, 0), 90 BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1), 91 BPF_JMP_IMM(BPF_JGT, BPF_REG_6, 10000, 2), 92 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32), 93 BPF_JMP_A(-4), 94 BPF_EXIT_INSN(), 95 }, 96 .result = ACCEPT, 97 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 98 }, 99 { 100 "infinite loop after a conditional jump", 101 .insns = { 102 BPF_MOV64_IMM(BPF_REG_0, 5), 103 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, 2), 104 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 105 BPF_JMP_A(-2), 106 BPF_EXIT_INSN(), 107 }, 108 .result = REJECT, 109 .errstr = "program is too large", 110 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 111 }, 112 { 113 "bounded recursion", 114 .insns = { 115 BPF_MOV64_IMM(BPF_REG_1, 0), 116 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1), 117 BPF_EXIT_INSN(), 118 BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1), 119 BPF_MOV64_REG(BPF_REG_0, BPF_REG_1), 120 BPF_JMP_IMM(BPF_JLT, BPF_REG_1, 4, 1), 121 BPF_EXIT_INSN(), 122 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -5), 123 BPF_EXIT_INSN(), 124 }, 125 .result = REJECT, 126 .errstr = "back-edge", 127 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 128 }, 129 { 130 "infinite loop in two jumps", 131 .insns = { 132 BPF_MOV64_IMM(BPF_REG_0, 0), 133 BPF_JMP_A(0), 134 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2), 135 BPF_EXIT_INSN(), 136 }, 137 .result = REJECT, 138 .errstr = "loop detected", 139 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 140 }, 141 { 142 "infinite loop: three-jump trick", 143 .insns = { 144 BPF_MOV64_IMM(BPF_REG_0, 0), 145 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 146 BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1), 147 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1), 148 BPF_EXIT_INSN(), 149 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 150 BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1), 151 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1), 152 BPF_EXIT_INSN(), 153 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), 154 BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1), 155 BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, -11), 156 BPF_EXIT_INSN(), 157 }, 158 .result = REJECT, 159 .errstr = "loop detected", 160 .prog_type = BPF_PROG_TYPE_TRACEPOINT, 161 }, 162 { 163 "not-taken loop with back jump to 1st insn", 164 .insns = { 165 BPF_MOV64_IMM(BPF_REG_0, 123), 166 BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, -2), 167 BPF_EXIT_INSN(), 168 }, 169 .result = ACCEPT, 170 .prog_type = BPF_PROG_TYPE_XDP, 171 .retval = 123, 172 }, 173 { 174 "taken loop with back jump to 1st insn", 175 .insns = { 176 BPF_MOV64_IMM(BPF_REG_1, 10), 177 BPF_MOV64_IMM(BPF_REG_2, 0), 178 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1), 179 BPF_EXIT_INSN(), 180 BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1), 181 BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1), 182 BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, -3), 183 BPF_MOV64_REG(BPF_REG_0, BPF_REG_2), 184 BPF_EXIT_INSN(), 185 }, 186 .result = ACCEPT, 187 .prog_type = BPF_PROG_TYPE_XDP, 188 .retval = 55, 189 }, 190
