summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/bpf/verifier/bounds_deduction.c
blob: 1fd07a4f27ac215a5fd8f258c13079793b2a0e0e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
{
	"check deducing bounds from const, 1",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 0),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "R0 tried to subtract pointer from scalar",
},
{
	"check deducing bounds from const, 2",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 1),
		BPF_EXIT_INSN(),
		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 1, 1),
		BPF_EXIT_INSN(),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
		BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.retval = 1,
},
{
	"check deducing bounds from const, 3",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 0),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "R0 tried to subtract pointer from scalar",
},
{
	"check deducing bounds from const, 4",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 1),
		BPF_EXIT_INSN(),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
		BPF_EXIT_INSN(),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
		BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
},
{
	"check deducing bounds from const, 5",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 1),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "R0 tried to subtract pointer from scalar",
},
{
	"check deducing bounds from const, 6",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
		BPF_EXIT_INSN(),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "R0 tried to subtract pointer from scalar",
},
{
	"check deducing bounds from const, 7",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, ~0),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 0),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
			    offsetof(struct __sk_buff, mark)),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "dereference of modified ctx ptr",
	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
	"check deducing bounds from const, 8",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, ~0),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
		BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
			    offsetof(struct __sk_buff, mark)),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "dereference of modified ctx ptr",
	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
	"check deducing bounds from const, 9",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 0),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "R0 tried to subtract pointer from scalar",
},
{
	"check deducing bounds from const, 10",
	.insns = {
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 0),
		/* Marks reg as unknown. */
		BPF_ALU64_IMM(BPF_NEG, BPF_REG_0, 0),
		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
		BPF_EXIT_INSN(),
	},
	.result = REJECT,
	.errstr = "math between ctx pointer and register with unbounded min value is not allowed",
},