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

{
	"spin_lock: test1 success",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = ACCEPT,
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test2 direct ld/st",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "cannot be accessed directly",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test3 direct ld/st",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 1),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "cannot be accessed directly",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
	"spin_lock: test4 direct ld/st",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_6, 3),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "cannot be accessed directly",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
	"spin_lock: test5 call within a locked region",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "calls are not allowed",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test6 missing unlock",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "unlock is missing",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test7 unlock without lock",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "without taking a lock",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test8 double lock",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "calls are not allowed",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test9 different lock",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3, 11 },
	.result = REJECT,
	.errstr = "unlock of different lock",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test10 lock in subprog without unlock",
	.insns = {
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 5),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3 },
	.result = REJECT,
	.errstr = "unlock is missing",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
	"spin_lock: test11 ld_abs under lock",
	.insns = {
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
	BPF_ST_MEM(BPF_W, 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_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_LD_ABS(BPF_B, 0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 4 },
	.result = REJECT,
	.errstr = "inside bpf_spin_lock",
	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
	"spin_lock: regsafe compare reg->id for map value",
	.insns = {
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
	BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_6, offsetof(struct __sk_buff, mark)),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_MOV64_REG(BPF_REG_9, BPF_REG_1),
	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_9),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 1),
	BPF_JMP_IMM(BPF_JA, 0, 0, 1),
	BPF_MOV64_REG(BPF_REG_7, BPF_REG_8),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 2 },
	.result = REJECT,
	.errstr = "bpf_spin_unlock of different lock",
	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
	.flags = BPF_F_TEST_STATE_FREQ,
},
/* Make sure that regsafe() compares ids for spin lock records using
 * check_ids():
 *  1: r9 = map_lookup_elem(...)  ; r9.id == 1
 *  2: r8 = map_lookup_elem(...)  ; r8.id == 2
 *  3: r7 = ktime_get_ns()
 *  4: r6 = ktime_get_ns()
 *  5: if r6 > r7 goto <9>
 *  6: spin_lock(r8)
 *  7: r9 = r8
 *  8: goto <10>
 *  9: spin_lock(r9)
 * 10: spin_unlock(r9)             ; r9.id == 1 || r9.id == 2 and lock is active,
 *                                 ; second visit to (10) should be considered safe
 *                                 ; if check_ids() is used.
 * 11: exit(0)
 */
{
	"spin_lock: regsafe() check_ids() similar id mappings",
	.insns = {
	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
	/* r9 = map_lookup_elem(...) */
	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_EMIT_CALL(BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 24),
	BPF_MOV64_REG(BPF_REG_9, BPF_REG_0),
	/* r8 = map_lookup_elem(...) */
	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_EMIT_CALL(BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 18),
	BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
	/* r7 = ktime_get_ns() */
	BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
	/* r6 = ktime_get_ns() */
	BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
	/* if r6 > r7 goto +5      ; no new information about the state is derived from
	 *                         ; this check, thus produced verifier states differ
	 *                         ; only in 'insn_idx'
	 * spin_lock(r8)
	 * r9 = r8
	 * goto unlock
	 */
	BPF_JMP_REG(BPF_JGT, BPF_REG_6, BPF_REG_7, 5),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_EMIT_CALL(BPF_FUNC_spin_lock),
	BPF_MOV64_REG(BPF_REG_9, BPF_REG_8),
	BPF_JMP_A(3),
	/* spin_lock(r9) */
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_9),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_EMIT_CALL(BPF_FUNC_spin_lock),
	/* spin_unlock(r9) */
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_9),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
	BPF_EMIT_CALL(BPF_FUNC_spin_unlock),
	/* exit(0) */
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	},
	.fixup_map_spin_lock = { 3, 10 },
	.result = VERBOSE_ACCEPT,
	.errstr = "28: safe",
	.result_unpriv = REJECT,
	.errstr_unpriv = "",
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
	.flags = BPF_F_TEST_STATE_FREQ,
},