[PATCH AUTOSEL 5.0 201/262] selftests/bpf: skip verifier tests for unsupported program types

Sasha Levin
2019-03-27T19:17:47Z

From: Stanislav Fomichev <sdf@google.com>

[ Upstream commit 8184d44c9a577a2f1842ed6cc844bfd4a9981d8e ]

Use recently introduced bpf_probe_prog_type() to skip tests in the
test_verifier() if bpf_verify_program() fails. The skipped test is
indicated in the output.

Example:

...
679/p bpf_get_stack return R0 within range SKIP (unsupported program
type 5)
680/p ld_abs: invalid op 1 OK
...
Summary: 863 PASSED, 165 SKIPPED, 3 FAILED

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/bpf/test_verifier.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 2fd90d456892..9a967983abed 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -34,6 +34,7 @@
#include <linux/if_ether.h>

#include <bpf/bpf.h>
+#include <bpf/libbpf.h>

#ifdef HAVE_GENHDR
# include "autoconf.h"
@@ -59,6 +60,7 @@

#define UNPRIV_SYSCTL "kernel/unprivileged_bpf_disabled"
static bool unpriv_disabled = false;
+static int skips;

struct bpf_test {
const char *descr;
@@ -15946,6 +15948,11 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
pflags |= BPF_F_ANY_ALIGNMENT;
fd_prog = bpf_verify_program(prog_type, prog, prog_len, pflags,
"GPL", 0, bpf_vlog, sizeof(bpf_vlog), 1);
+ if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
+ printf("SKIP (unsupported program type %d)\n", prog_type);
+ skips++;
+ goto close_fds;
+ }

expected_ret = unpriv && test->result_unpriv != UNDEF ?
test->result_unpriv : test->result;
@@ -16099,7 +16106,7 @@ static bool test_as_unpriv(struct bpf_test *test)

static int do_test(bool unpriv, unsigned int from, unsigned int to)
{
- int i, passes = 0, errors = 0, skips = 0;
+ int i, passes = 0, errors = 0;

for (i = from; i < to; i++) {
struct bpf_test *test = &tests[i];
--
2.19.1