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test_bpf: Add backward jump test case

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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>
This commit is contained in:
Michael Holzheu 2015-05-22 08:36:40 -07:00 committed by David S. Miller
parent 12c227ec89
commit fe59384495
1 changed files with 16 additions and 0 deletions
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16
lib/test_bpf.c
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@ -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 = {