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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2015-05-22 08:36:40 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-05-22 15:10:51 -0400 |
| commit | fe593844957a7ce092ee14e085ee8ddfd6c3b73f (patch) | |
| tree | 1f41b51bac7e836294405e4b1f03594bd9bfea74 /lib/test_bpf.c | |
| parent | 12c227ec89a70c14e3efcf102c5babece381e172 (diff) | |
| download | linux-0-day-fe593844957a7ce092ee14e085ee8ddfd6c3b73f.tar.gz linux-0-day-fe593844957a7ce092ee14e085ee8ddfd6c3b73f.tar.xz | |
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.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c index aaa0a40a7eb37..9b012a811ee1c 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 = { |