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Commit 342ded40 authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by David S. Miller
Browse files

samples: bpf: add a verifier test and summary line 



- add a test specifically targeting verifier state pruning.
It checks state propagation between registers, storing that
state into stack and state pruning algorithm recognizing
equivalent stack and register states.

- add summary line to spot failures easier

Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9c399760

samples/bpf/test_verifier.c

+45 −1
Original line number Diff line number Diff line
@@ -602,6 +602,45 @@ static struct bpf_test tests[] = { 
		},

		.result = ACCEPT,

	},

	{

		"jump test 5",

		.insns = {

			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),

			BPF_MOV64_REG(BPF_REG_3, BPF_REG_2),

			BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_3, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_2, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_3, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_2, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_3, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_2, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_3, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_2, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_3, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 2),

			BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_2, -8),

			BPF_JMP_IMM(BPF_JA, 0, 0, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

	},

};



static int probe_filter_length(struct bpf_insn *fp)
@@ -630,7 +669,7 @@ static int create_map(void) 


static int test(void)

{

	int prog_fd, i;

	int prog_fd, i, pass_cnt = 0, err_cnt = 0;



	for (i = 0; i < ARRAY_SIZE(tests); i++) {

		struct bpf_insn *prog = tests[i].insns;
@@ -657,21 +696,25 @@ static int test(void) 
				printf("FAIL\nfailed to load prog '%s'\n",

				       strerror(errno));

				printf("%s", bpf_log_buf);

				err_cnt++;

				goto fail;

			}

		} else {

			if (prog_fd >= 0) {

				printf("FAIL\nunexpected success to load\n");

				printf("%s", bpf_log_buf);

				err_cnt++;

				goto fail;

			}

			if (strstr(bpf_log_buf, tests[i].errstr) == 0) {

				printf("FAIL\nunexpected error message: %s",

				       bpf_log_buf);

				err_cnt++;

				goto fail;

			}

		}



		pass_cnt++;

		printf("OK\n");

fail:

		if (map_fd >= 0)
@@ -679,6 +722,7 @@ static int test(void) 
		close(prog_fd);



	}

	printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, err_cnt);



	return 0;

}