Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Open Menu / tools / testing / selftests / bpf / verifier / bpf_loop_inline.c
Loading...
  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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
#define BTF_TYPES \
	.btf_strings = "\0int\0i\0ctx\0callback\0main\0", \
	.btf_types = { \
	/* 1: int   */ BTF_TYPE_INT_ENC(1, BTF_INT_SIGNED, 0, 32, 4), \
	/* 2: int*  */ BTF_PTR_ENC(1), \
	/* 3: void* */ BTF_PTR_ENC(0), \
	/* 4: int __(void*) */ BTF_FUNC_PROTO_ENC(1, 1), \
		BTF_FUNC_PROTO_ARG_ENC(7, 3), \
	/* 5: int __(int, int*) */ BTF_FUNC_PROTO_ENC(1, 2), \
		BTF_FUNC_PROTO_ARG_ENC(5, 1), \
		BTF_FUNC_PROTO_ARG_ENC(7, 2), \
	/* 6: main      */ BTF_FUNC_ENC(20, 4), \
	/* 7: callback  */ BTF_FUNC_ENC(11, 5), \
	BTF_END_RAW \
	}

#define MAIN_TYPE	6
#define CALLBACK_TYPE	7

/* can't use BPF_CALL_REL, jit_subprogs adjusts IMM & OFF
 * fields for pseudo calls
 */
#define PSEUDO_CALL_INSN() \
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_CALL, \
		     INSN_OFF_MASK, INSN_IMM_MASK)

/* can't use BPF_FUNC_loop constant,
 * do_mix_fixups adjusts the IMM field
 */
#define HELPER_CALL_INSN() \
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, INSN_OFF_MASK, INSN_IMM_MASK)

{
	"inline simple bpf_loop call",
	.insns = {
	/* main */
	/* force verifier state branching to verify logic on first and
	 * subsequent bpf_loop insn processing steps
	 */
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_jiffies64),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 777, 2),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 1),
	BPF_JMP_IMM(BPF_JA, 0, 0, 1),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 2),

	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 6),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	/* callback */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	},
	.expected_insns = { PSEUDO_CALL_INSN() },
	.unexpected_insns = { HELPER_CALL_INSN() },
	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
	.flags = F_NEEDS_JIT_ENABLED,
	.result = ACCEPT,
	.runs = 0,
	.func_info = { { 0, MAIN_TYPE }, { 12, CALLBACK_TYPE } },
	.func_info_cnt = 2,
	BTF_TYPES
},
{
	"don't inline bpf_loop call, flags non-zero",
	.insns = {
	/* main */
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_jiffies64),
	BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_jiffies64),
	BPF_ALU64_REG(BPF_MOV, BPF_REG_7, BPF_REG_0),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_6, 0, 9),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 1),
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 7),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 1),
	BPF_JMP_IMM(BPF_JA, 0, 0, -10),
	/* callback */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	},
	.expected_insns = { HELPER_CALL_INSN() },
	.unexpected_insns = { PSEUDO_CALL_INSN() },
	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
	.flags = F_NEEDS_JIT_ENABLED,
	.result = ACCEPT,
	.runs = 0,
	.func_info = { { 0, MAIN_TYPE }, { 16, CALLBACK_TYPE } },
	.func_info_cnt = 2,
	BTF_TYPES
},
{
	"don't inline bpf_loop call, callback non-constant",
	.insns = {
	/* main */
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_jiffies64),
	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 777, 4), /* pick a random callback */

	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 1),
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 10),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_JMP_IMM(BPF_JA, 0, 0, 3),

	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 1),
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 8),
	BPF_RAW_INSN(0, 0, 0, 0, 0),

	BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	/* callback */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	/* callback #2 */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	},
	.expected_insns = { HELPER_CALL_INSN() },
	.unexpected_insns = { PSEUDO_CALL_INSN() },
	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
	.flags = F_NEEDS_JIT_ENABLED,
	.result = ACCEPT,
	.runs = 0,
	.func_info = {
		{ 0, MAIN_TYPE },
		{ 14, CALLBACK_TYPE },
		{ 16, CALLBACK_TYPE }
	},
	.func_info_cnt = 3,
	BTF_TYPES
},
{
	"bpf_loop_inline and a dead func",
	.insns = {
	/* main */

	/* A reference to callback #1 to make verifier count it as a func.
	 * This reference is overwritten below and callback #1 is dead.
	 */
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 9),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 1),
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 8),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	/* callback */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	/* callback #2 */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	},
	.expected_insns = { PSEUDO_CALL_INSN() },
	.unexpected_insns = { HELPER_CALL_INSN() },
	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
	.flags = F_NEEDS_JIT_ENABLED,
	.result = ACCEPT,
	.runs = 0,
	.func_info = {
		{ 0, MAIN_TYPE },
		{ 10, CALLBACK_TYPE },
		{ 12, CALLBACK_TYPE }
	},
	.func_info_cnt = 3,
	BTF_TYPES
},
{
	"bpf_loop_inline stack locations for loop vars",
	.insns = {
	/* main */
	BPF_ST_MEM(BPF_W, BPF_REG_10, -12, 0x77),
	/* bpf_loop call #1 */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 1),
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 22),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop),
	/* bpf_loop call #2 */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 2),
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 16),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop),
	/* call func and exit */
	BPF_CALL_REL(2),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	/* func */
	BPF_ST_MEM(BPF_DW, BPF_REG_10, -32, 0x55),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 2),
	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_2, BPF_PSEUDO_FUNC, 0, 6),
	BPF_RAW_INSN(0, 0, 0, 0, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop),
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
	BPF_EXIT_INSN(),
	/* callback */
	BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	},
	.expected_insns = {
	BPF_ST_MEM(BPF_W, BPF_REG_10, -12, 0x77),
	SKIP_INSNS(),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -40),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_7, -32),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_8, -24),
	SKIP_INSNS(),
	/* offsets are the same as in the first call */
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -40),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_7, -32),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_8, -24),
	SKIP_INSNS(),
	BPF_ST_MEM(BPF_DW, BPF_REG_10, -32, 0x55),
	SKIP_INSNS(),
	/* offsets differ from main because of different offset
	 * in BPF_ST_MEM instruction
	 */
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -56),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_7, -48),
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_8, -40),
	},
	.unexpected_insns = { HELPER_CALL_INSN() },
	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
	.flags = F_NEEDS_JIT_ENABLED,
	.result = ACCEPT,
	.func_info = {
		{ 0, MAIN_TYPE },
		{ 16, MAIN_TYPE },
		{ 25, CALLBACK_TYPE },
	},
	.func_info_cnt = 3,
	BTF_TYPES
},
{
	"inline bpf_loop call in a big program",
	.insns = {},
	.fill_helper = bpf_fill_big_prog_with_loop_1,
	.expected_insns = { PSEUDO_CALL_INSN() },
	.unexpected_insns = { HELPER_CALL_INSN() },
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
	.flags = F_NEEDS_JIT_ENABLED,
	.func_info = { { 0, MAIN_TYPE }, { 16, CALLBACK_TYPE } },
	.func_info_cnt = 2,
	BTF_TYPES
},

#undef HELPER_CALL_INSN
#undef PSEUDO_CALL_INSN
#undef CALLBACK_TYPE
#undef MAIN_TYPE
#undef BTF_TYPES