test_bpf: Add backward jump test case (fe593844) · Commits · 戴 / test

Currently the testsuite does not have a test case with a backward jump. The s390x JIT (kernel 4.0) had a bug in that area. So add one new test case for this now. Signed-off-by:

Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by:

Alexei Starovoitov <ast@plumgrid.com> Acked-by:

Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:

David S. Miller <davem@davemloft.net>

lib/test_bpf.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -3940,6 +3940,22 @@ static struct bpf_test tests[] = {
		{ },
		{ { 0, 1 } },
		},
		/* BPF_JMP \| BPF_JGT \| BPF_K jump backwards */
		{
		"JMP_JGT_K: if (3 > 2) return 1 (jump backwards)",
		.u.insns_int = {
		BPF_JMP_IMM(BPF_JA, 0, 0, 2), /* goto start */
		BPF_ALU32_IMM(BPF_MOV, R0, 1), /* out: */
		BPF_EXIT_INSN(),
		BPF_ALU32_IMM(BPF_MOV, R0, 0), /* start: */
		BPF_LD_IMM64(R1, 3), /* note: this takes 2 insns */
		BPF_JMP_IMM(BPF_JGT, R1, 2, -6), /* goto out */
		BPF_EXIT_INSN(),
		},
		INTERNAL,
		{ },
		{ { 0, 1 } },
		},
		{
		"JMP_JGE_K: if (3 >= 3) return 1",
		.u.insns_int = {

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