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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2015-05-22 15:36:40 (GMT)
committerDavid S. Miller <davem@davemloft.net>2015-05-22 19:10:51 (GMT)
commitfe593844957a7ce092ee14e085ee8ddfd6c3b73f (patch)
tree1f41b51bac7e836294405e4b1f03594bd9bfea74 /lib/test_bpf.c
parent12c227ec89a70c14e3efcf102c5babece381e172 (diff)
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: 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>
Diffstat (limited to 'lib/test_bpf.c')
-rw-r--r--lib/test_bpf.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index aaa0a40..9b012a8 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -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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