selftests/bpf: fix tests

Fix tests that assumed no loops.

Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>

Author: Alexei Starovoitov

tools/testing/selftests/bpf/test_verifier.c

@@ -237,10 +237,10 @@ static void bpf_fill_scale1(struct bpf_test *self)
 		insn[i++] = BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
 					-8 * (k % 64 + 1));
 	}
-	/* every jump adds 1 step to insn_processed, so to stay exactly
-	 * within 1m limit add MAX_TEST_INSNS - MAX_JMP_SEQ - 1 MOVs and 1 EXIT
+	/* is_state_visited() doesn't allocate state for pruning for every jump.
+	 * Hence multiply jmps by 4 to accommodate that heuristic
 	 */
-	while (i < MAX_TEST_INSNS - MAX_JMP_SEQ - 1)
+	while (i < MAX_TEST_INSNS - MAX_JMP_SEQ * 4)
 		insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 42);
 	insn[i] = BPF_EXIT_INSN();
 	self->prog_len = i + 1;
@@ -269,10 +269,7 @@ static void bpf_fill_scale2(struct bpf_test *self)
 		insn[i++] = BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
 					-8 * (k % (64 - 4 * FUNC_NEST) + 1));
 	}
-	/* every jump adds 1 step to insn_processed, so to stay exactly
-	 * within 1m limit add MAX_TEST_INSNS - MAX_JMP_SEQ - 1 MOVs and 1 EXIT
-	 */
-	while (i < MAX_TEST_INSNS - MAX_JMP_SEQ - 1)
+	while (i < MAX_TEST_INSNS - MAX_JMP_SEQ * 4)
 		insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 42);
 	insn[i] = BPF_EXIT_INSN();
 	self->prog_len = i + 1;

tools/testing/selftests/bpf/verifier/calls.c

@@ -215,9 +215,11 @@
 	BPF_MOV64_IMM(BPF_REG_0, 3),
 	BPF_JMP_IMM(BPF_JA, 0, 0, -6),
 	},
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-	.errstr = "back-edge from insn",
-	.result = REJECT,
+	.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
+	.errstr_unpriv = "back-edge from insn",
+	.result_unpriv = REJECT,
+	.result = ACCEPT,
+	.retval = 1,
 },
 {
 	"calls: conditional call 4",
@@ -250,22 +252,24 @@
 	BPF_MOV64_IMM(BPF_REG_0, 3),
 	BPF_EXIT_INSN(),
 	},
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-	.errstr = "back-edge from insn",
-	.result = REJECT,
+	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+	.result = ACCEPT,
+	.retval = 1,
 },
 {
 	"calls: conditional call 6",
 	.insns = {
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
 	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
-	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, -2),
+	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, -3),
 	BPF_EXIT_INSN(),
 	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
 		    offsetof(struct __sk_buff, mark)),
 	BPF_EXIT_INSN(),
 	},
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-	.errstr = "back-edge from insn",
+	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+	.errstr = "infinite loop detected",
 	.result = REJECT,
 },
 {

tools/testing/selftests/bpf/verifier/cfg.c

@@ -41,7 +41,8 @@
 	BPF_JMP_IMM(BPF_JA, 0, 0, -1),
 	BPF_EXIT_INSN(),
 	},
-	.errstr = "back-edge",
+	.errstr = "unreachable insn 1",
+	.errstr_unpriv = "back-edge",
 	.result = REJECT,
 },
 {
@@ -53,18 +54,20 @@
 	BPF_JMP_IMM(BPF_JA, 0, 0, -4),
 	BPF_EXIT_INSN(),
 	},
-	.errstr = "back-edge",
+	.errstr = "unreachable insn 4",
+	.errstr_unpriv = "back-edge",
 	.result = REJECT,
 },
 {
 	"conditional loop",
 	.insns = {
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
 	BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
 	BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
 	BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, -3),
 	BPF_EXIT_INSN(),
 	},
-	.errstr = "back-edge",
+	.errstr = "infinite loop detected",
+	.errstr_unpriv = "back-edge",
 	.result = REJECT,
 },