{
        "BPF_ST_MEM stack imm non-zero",
        .insns = {
        BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 42),
        BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
        BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, -42),
        /* if value is tracked correctly R0 is zero */
        BPF_EXIT_INSN(),
        },
        .result = ACCEPT,
        /* Use prog type that requires return value in range [0, 1] */
        .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
        .expected_attach_type = BPF_SK_LOOKUP,
        .runs = -1,
},
{
        "BPF_ST_MEM stack imm zero",
        .insns = {
        /* mark stack 0000 0000 */
        BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
        /* read and sum a few bytes */
        BPF_MOV64_IMM(BPF_REG_0, 0),
        BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -8),
        BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
        BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -4),
        BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
        BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -1),
        BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
        /* if value is tracked correctly R0 is zero */
        BPF_EXIT_INSN(),
        },
        .result = ACCEPT,
        /* Use prog type that requires return value in range [0, 1] */
        .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
        .expected_attach_type = BPF_SK_LOOKUP,
        .runs = -1,
},
{
        "BPF_ST_MEM stack imm zero, variable offset",
        .insns = {
        /* set fp[-16], fp[-24] to zeros */
        BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, 0),
        BPF_ST_MEM(BPF_DW, BPF_REG_10, -24, 0),
        /* r0 = random value in range [-32, -15] */
        BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
        BPF_JMP_IMM(BPF_JLE, BPF_REG_0, 16, 2),
        BPF_MOV64_IMM(BPF_REG_0, 0),
        BPF_EXIT_INSN(),
        BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 32),
        /* fp[r0] = 0, make a variable offset write of zero,
         *             this should preserve zero marks on stack.
         */
        BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_10),
        BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
        /* r0 = fp[-20], if variable offset write was tracked correctly
         *               r0 would be a known zero.
         */
        BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_10, -20),
        /* Would fail return code verification if r0 range is not tracked correctly. */
        BPF_EXIT_INSN(),
        },
        .result = ACCEPT,
        /* Use prog type that requires return value in range [0, 1] */
        .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
        .expected_attach_type = BPF_SK_LOOKUP,
        .runs = -1,
},
{
        "BPF_ST_MEM stack imm sign",
        /* Check if verifier correctly reasons about sign of an
         * immediate spilled to stack by BPF_ST instruction.
         *
         *   fp[-8] = -44;
         *   r0 = fp[-8];
         *   if r0 s< 0 goto ret0;
         *   r0 = -1;
         *   exit;
         * ret0:
         *   r0 = 0;
         *   exit;
         */
        .insns = {
        BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, -44),
        BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
        BPF_JMP_IMM(BPF_JSLT, BPF_REG_0, 0, 2),
        BPF_MOV64_IMM(BPF_REG_0, -1),
        BPF_EXIT_INSN(),
        BPF_MOV64_IMM(BPF_REG_0, 0),
        BPF_EXIT_INSN(),
        },
        /* Use prog type that requires return value in range [0, 1] */
        .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
        .expected_attach_type = BPF_SK_LOOKUP,
        .result = VERBOSE_ACCEPT,
        .runs = -1,
        .errstr = "0: (7a) *(u64 *)(r10 -8) = -44        ; R10=fp0 fp-8=-44\
        2: (c5) if r0 s< 0x0 goto pc+2\
        R0=-44",
},