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Commit fe593844 authored by Michael Holzheu's avatar Michael Holzheu Committed by David S. Miller
Browse files

test_bpf: Add backward jump test case 



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: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 12c227ec

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 = {