1 {
2 "BPF_ST_MEM stack imm non-zero",
3 .insns = {
4 BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 42),
5 BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
6 BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, -42),
7 /* if value is tracked correctly R0 is zero */
8 BPF_EXIT_INSN(),
9 },
10 .result = ACCEPT,
11 /* Use prog type that requires return value in range [0, 1] */
12 .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
13 .expected_attach_type = BPF_SK_LOOKUP,
14 .runs = -1,
15 },
16 {
17 "BPF_ST_MEM stack imm zero",
18 .insns = {
19 /* mark stack 0000 0000 */
20 BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
21 /* read and sum a few bytes */
22 BPF_MOV64_IMM(BPF_REG_0, 0),
23 BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -8),
24 BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
25 BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -4),
26 BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
27 BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -1),
28 BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
29 /* if value is tracked correctly R0 is zero */
30 BPF_EXIT_INSN(),
31 },
32 .result = ACCEPT,
33 /* Use prog type that requires return value in range [0, 1] */
34 .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
35 .expected_attach_type = BPF_SK_LOOKUP,
36 .runs = -1,
37 },
38 {
39 "BPF_ST_MEM stack imm zero, variable offset",
40 .insns = {
41 /* set fp[-16], fp[-24] to zeros */
42 BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, 0),
43 BPF_ST_MEM(BPF_DW, BPF_REG_10, -24, 0),
44 /* r0 = random value in range [-32, -15] */
45 BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
46 BPF_JMP_IMM(BPF_JLE, BPF_REG_0, 16, 2),
47 BPF_MOV64_IMM(BPF_REG_0, 0),
48 BPF_EXIT_INSN(),
49 BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 32),
50 /* fp[r0] = 0, make a variable offset write of zero,
51 * this should preserve zero marks on stack.
52 */
53 BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_10),
54 BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
55 /* r0 = fp[-20], if variable offset write was tracked correctly
56 * r0 would be a known zero.
57 */
58 BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_10, -20),
59 /* Would fail return code verification if r0 range is not tracked correctly. */
60 BPF_EXIT_INSN(),
61 },
62 .result = ACCEPT,
63 /* Use prog type that requires return value in range [0, 1] */
64 .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
65 .expected_attach_type = BPF_SK_LOOKUP,
66 .runs = -1,
67 },
68 {
69 "BPF_ST_MEM stack imm sign",
70 /* Check if verifier correctly reasons about sign of an
71 * immediate spilled to stack by BPF_ST instruction.
72 *
73 * fp[-8] = -44;
74 * r0 = fp[-8];
75 * if r0 s< 0 goto ret0;
76 * r0 = -1;
77 * exit;
78 * ret0:
79 * r0 = 0;
80 * exit;
81 */
82 .insns = {
83 BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, -44),
84 BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
85 BPF_JMP_IMM(BPF_JSLT, BPF_REG_0, 0, 2),
86 BPF_MOV64_IMM(BPF_REG_0, -1),
87 BPF_EXIT_INSN(),
88 BPF_MOV64_IMM(BPF_REG_0, 0),
89 BPF_EXIT_INSN(),
90 },
91 /* Use prog type that requires return value in range [0, 1] */
92 .prog_type = BPF_PROG_TYPE_SK_LOOKUP,
93 .expected_attach_type = BPF_SK_LOOKUP,
94 .result = VERBOSE_ACCEPT,
95 .runs = -1,
96 .errstr = "0: (7a) *(u64 *)(r10 -8) = -44 ; R10=fp0 fp-8_w=-44\
97 2: (c5) if r0 s< 0x0 goto pc+2\
98 R0_w=-44",
99 },
100
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