267 lines
8.8 KiB
C
267 lines
8.8 KiB
C
{
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"pointer/scalar confusion in state equality check (way 1)",
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.insns = {
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
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BPF_JMP_A(1),
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
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BPF_JMP_A(0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_hash_8b = { 3 },
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.result = ACCEPT,
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.retval = POINTER_VALUE,
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.result_unpriv = REJECT,
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.errstr_unpriv = "R0 leaks addr as return value"
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},
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{
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"pointer/scalar confusion in state equality check (way 2)",
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.insns = {
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
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BPF_JMP_A(1),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_hash_8b = { 3 },
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.result = ACCEPT,
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.retval = POINTER_VALUE,
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.result_unpriv = REJECT,
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.errstr_unpriv = "R0 leaks addr as return value"
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},
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{
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"liveness pruning and write screening",
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.insns = {
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/* Get an unknown value */
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 0),
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/* branch conditions teach us nothing about R2 */
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BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.errstr = "R0 !read_ok",
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.result = REJECT,
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.prog_type = BPF_PROG_TYPE_LWT_IN,
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},
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{
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"varlen_map_value_access pruning",
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.insns = {
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
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BPF_MOV32_IMM(BPF_REG_2, MAX_ENTRIES),
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BPF_JMP_REG(BPF_JSGT, BPF_REG_2, BPF_REG_1, 1),
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BPF_MOV32_IMM(BPF_REG_1, 0),
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BPF_ALU32_IMM(BPF_LSH, BPF_REG_1, 2),
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BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
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BPF_JMP_IMM(BPF_JA, 0, 0, 0),
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BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, offsetof(struct test_val, foo)),
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BPF_EXIT_INSN(),
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},
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.fixup_map_hash_48b = { 3 },
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.errstr_unpriv = "R0 leaks addr",
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.errstr = "R0 unbounded memory access",
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.result_unpriv = REJECT,
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.result = REJECT,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"search pruning: all branches should be verified (nop operation)",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
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BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 11),
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BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_3, 0xbeef, 2),
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BPF_MOV64_IMM(BPF_REG_4, 0),
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BPF_JMP_A(1),
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BPF_MOV64_IMM(BPF_REG_4, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_4, -16),
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BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
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BPF_LDX_MEM(BPF_DW, BPF_REG_5, BPF_REG_10, -16),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_5, 0, 2),
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BPF_MOV64_IMM(BPF_REG_6, 0),
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BPF_ST_MEM(BPF_DW, BPF_REG_6, 0, 0xdead),
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BPF_EXIT_INSN(),
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},
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.fixup_map_hash_8b = { 3 },
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.errstr = "R6 invalid mem access 'scalar'",
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.result = REJECT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"search pruning: all branches should be verified (invalid stack access)",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
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BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
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BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_4, 0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_3, 0xbeef, 2),
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_4, -16),
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BPF_JMP_A(1),
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_4, -24),
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BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
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BPF_LDX_MEM(BPF_DW, BPF_REG_5, BPF_REG_10, -16),
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BPF_EXIT_INSN(),
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},
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.fixup_map_hash_8b = { 3 },
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.errstr_unpriv = "invalid read from stack off -16+0 size 8",
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.result_unpriv = REJECT,
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/* in privileged mode reads from uninitialized stack locations are permitted */
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.result = ACCEPT,
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},
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{
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"precision tracking for u32 spill/fill",
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.insns = {
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BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
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BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
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BPF_MOV32_IMM(BPF_REG_6, 32),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_MOV32_IMM(BPF_REG_6, 4),
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/* Additional insns to introduce a pruning point. */
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BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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/* u32 spill/fill */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_6, -8),
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BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_10, -8),
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/* out-of-bound map value access for r6=32 */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
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BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_8),
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BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_hash_8b = { 15 },
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.result = REJECT,
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.errstr = "R0 min value is outside of the allowed memory range",
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"precision tracking for u32 spills, u64 fill",
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.insns = {
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BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV32_IMM(BPF_REG_7, 0xffffffff),
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/* Additional insns to introduce a pruning point. */
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BPF_MOV64_IMM(BPF_REG_3, 1),
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BPF_MOV64_IMM(BPF_REG_3, 1),
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BPF_MOV64_IMM(BPF_REG_3, 1),
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BPF_MOV64_IMM(BPF_REG_3, 1),
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BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_MOV64_IMM(BPF_REG_3, 1),
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BPF_ALU32_IMM(BPF_DIV, BPF_REG_3, 0),
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/* u32 spills, u64 fill */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_6, -4),
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_7, -8),
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BPF_LDX_MEM(BPF_DW, BPF_REG_8, BPF_REG_10, -8),
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/* if r8 != X goto pc+1 r8 known in fallthrough branch */
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BPF_JMP_IMM(BPF_JNE, BPF_REG_8, 0xffffffff, 1),
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BPF_MOV64_IMM(BPF_REG_3, 1),
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/* if r8 == X goto pc+1 condition always true on first
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* traversal, so starts backtracking to mark r8 as requiring
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* precision. r7 marked as needing precision. r6 not marked
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* since it's not tracked.
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*/
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_8, 0xffffffff, 1),
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/* fails if r8 correctly marked unknown after fill. */
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BPF_ALU32_IMM(BPF_DIV, BPF_REG_3, 0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr = "div by zero",
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"allocated_stack",
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.insns = {
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BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
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BPF_ALU64_REG(BPF_MOV, BPF_REG_7, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
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BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_10, -8),
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BPF_STX_MEM(BPF_B, BPF_REG_10, BPF_REG_7, -9),
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BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_10, -9),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.result_unpriv = ACCEPT,
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.insn_processed = 15,
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},
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/* The test performs a conditional 64-bit write to a stack location
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* fp[-8], this is followed by an unconditional 8-bit write to fp[-8],
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* then data is read from fp[-8]. This sequence is unsafe.
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*
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* The test would be mistakenly marked as safe w/o dst register parent
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* preservation in verifier.c:copy_register_state() function.
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*
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* Note the usage of BPF_F_TEST_STATE_FREQ to force creation of the
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* checkpoint state after conditional 64-bit assignment.
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*/
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{
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"write tracking and register parent chain bug",
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.insns = {
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/* r6 = ktime_get_ns() */
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BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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/* r0 = ktime_get_ns() */
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BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
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/* if r0 > r6 goto +1 */
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BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_6, 1),
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/* *(u64 *)(r10 - 8) = 0xdeadbeef */
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BPF_ST_MEM(BPF_DW, BPF_REG_FP, -8, 0xdeadbeef),
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/* r1 = 42 */
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BPF_MOV64_IMM(BPF_REG_1, 42),
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/* *(u8 *)(r10 - 8) = r1 */
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BPF_STX_MEM(BPF_B, BPF_REG_FP, BPF_REG_1, -8),
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/* r2 = *(u64 *)(r10 - 8) */
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BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_FP, -8),
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/* exit(0) */
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.flags = BPF_F_TEST_STATE_FREQ,
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.errstr_unpriv = "invalid read from stack off -8+1 size 8",
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.result_unpriv = REJECT,
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/* in privileged mode reads from uninitialized stack locations are permitted */
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.result = ACCEPT,
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},
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