tools/testing/selftests/bpf/verifier/value_or_null.c

{
	"multiple registers share map_lookup_elem result",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_1, 10),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
	BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
{
	"alu ops on ptr_to_map_value_or_null, 1",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_1, 10),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -2),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 2),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
	BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.errstr = "R4 pointer arithmetic on map_value_or_null",
	.result = REJECT,
	.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
{
	"alu ops on ptr_to_map_value_or_null, 2",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_1, 10),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
	BPF_ALU64_IMM(BPF_AND, BPF_REG_4, -1),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
	BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.errstr = "R4 pointer arithmetic on map_value_or_null",
	.result = REJECT,
	.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
{
	"alu ops on ptr_to_map_value_or_null, 3",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_1, 10),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
	BPF_ALU64_IMM(BPF_LSH, BPF_REG_4, 1),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
	BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.errstr = "R4 pointer arithmetic on map_value_or_null",
	.result = REJECT,
	.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
{
	"invalid memory access with multiple map_lookup_elem calls",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_1, 10),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_MOV64_REG(BPF_REG_8, BPF_REG_1),
	BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
	BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.result = REJECT,
	.errstr = "R4 !read_ok",
	.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
{
	"valid indirect map_lookup_elem access with 2nd lookup in branch",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_1, 10),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_MOV64_REG(BPF_REG_8, BPF_REG_1),
	BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_IMM(BPF_REG_2, 10),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 0, 3),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
	BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
{
	"invalid map access from else condition",
	.insns = {
	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
	BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_1, MAX_ENTRIES-1, 1),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
	BPF_ALU64_IMM(BPF_LSH, BPF_REG_1, 2),
	BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
	BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, offsetof(struct test_val, foo)),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_48b = { 3 },
	.errstr = "R0 unbounded memory access",
	.result = REJECT,
	.errstr_unpriv = "R0 leaks addr",
	.result_unpriv = REJECT,
	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
	"map lookup and null branch prediction",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_1, 10),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 2),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_6, 0, 1),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_10, 10),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
	.result = ACCEPT,
},