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Open Menu /tools/testing/selftests/bpf/verifier/int_ptr.c 
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{
	"ARG_PTR_TO_LONG uninitialized",
	.insns = {
		/* bpf_strtoul arg1 (buf) */
		BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
		BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
		BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),

		BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),

		/* bpf_strtoul arg2 (buf_len) */
		BPF_MOV64_IMM(BPF_REG_2, 4),

		/* bpf_strtoul arg3 (flags) */
		BPF_MOV64_IMM(BPF_REG_3, 0),

		/* bpf_strtoul arg4 (res) */
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
		BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),

		/* bpf_strtoul() */
		BPF_EMIT_CALL(BPF_FUNC_strtoul),

		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
	.errstr = "invalid indirect read from stack off -16+0 size 8",
},
{
	"ARG_PTR_TO_LONG half-uninitialized",
	.insns = {
		/* bpf_strtoul arg1 (buf) */
		BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
		BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
		BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),

		BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),

		/* bpf_strtoul arg2 (buf_len) */
		BPF_MOV64_IMM(BPF_REG_2, 4),

		/* bpf_strtoul arg3 (flags) */
		BPF_MOV64_IMM(BPF_REG_3, 0),

		/* bpf_strtoul arg4 (res) */
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
		BPF_STX_MEM(BPF_W, BPF_REG_7, BPF_REG_0, 0),
		BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),

		/* bpf_strtoul() */
		BPF_EMIT_CALL(BPF_FUNC_strtoul),

		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
	.errstr = "invalid indirect read from stack off -16+4 size 8",
},
{
	"ARG_PTR_TO_LONG misaligned",
	.insns = {
		/* bpf_strtoul arg1 (buf) */
		BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
		BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
		BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),

		BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),

		/* bpf_strtoul arg2 (buf_len) */
		BPF_MOV64_IMM(BPF_REG_2, 4),

		/* bpf_strtoul arg3 (flags) */
		BPF_MOV64_IMM(BPF_REG_3, 0),

		/* bpf_strtoul arg4 (res) */
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -12),
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_STX_MEM(BPF_W, BPF_REG_7, BPF_REG_0, 0),
		BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 4),
		BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),

		/* bpf_strtoul() */
		BPF_EMIT_CALL(BPF_FUNC_strtoul),

		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
	.errstr = "misaligned stack access off (0x0; 0x0)+-20+0 size 8",
},
{
	"ARG_PTR_TO_LONG size < sizeof(long)",
	.insns = {
		/* bpf_strtoul arg1 (buf) */
		BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -16),
		BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
		BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),

		BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),

		/* bpf_strtoul arg2 (buf_len) */
		BPF_MOV64_IMM(BPF_REG_2, 4),

		/* bpf_strtoul arg3 (flags) */
		BPF_MOV64_IMM(BPF_REG_3, 0),

		/* bpf_strtoul arg4 (res) */
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, 12),
		BPF_STX_MEM(BPF_W, BPF_REG_7, BPF_REG_0, 0),
		BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),

		/* bpf_strtoul() */
		BPF_EMIT_CALL(BPF_FUNC_strtoul),

		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
	.errstr = "invalid stack type R4 off=-4 access_size=8",
},
{
	"ARG_PTR_TO_LONG initialized",
	.insns = {
		/* bpf_strtoul arg1 (buf) */
		BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
		BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
		BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),

		BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),

		/* bpf_strtoul arg2 (buf_len) */
		BPF_MOV64_IMM(BPF_REG_2, 4),

		/* bpf_strtoul arg3 (flags) */
		BPF_MOV64_IMM(BPF_REG_3, 0),

		/* bpf_strtoul arg4 (res) */
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
		BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
		BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),

		/* bpf_strtoul() */
		BPF_EMIT_CALL(BPF_FUNC_strtoul),

		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
},