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Open Menu /tools/testing/selftests/bpf/verifier/map_in_map.c 
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{
	"map in map access",
	.insns = {
	BPF_ST_MEM(0, BPF_REG_10, -4, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	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, 5),
	BPF_ST_MEM(0, BPF_REG_10, -4, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_in_map = { 3 },
	.result = ACCEPT,
},
{
	"invalid inner map pointer",
	.insns = {
	BPF_ST_MEM(0, BPF_REG_10, -4, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	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_ST_MEM(0, BPF_REG_10, -4, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_in_map = { 3 },
	.errstr = "R1 pointer arithmetic on map_ptr prohibited",
	.result = REJECT,
},
{
	"forgot null checking on the inner map pointer",
	.insns = {
	BPF_ST_MEM(0, BPF_REG_10, -4, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_ST_MEM(0, BPF_REG_10, -4, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_in_map = { 3 },
	.errstr = "R1 type=map_value_or_null expected=map_ptr",
	.result = REJECT,
},