On Mon, Jul 8, 2019 at 3:43 PM Krzesimir Nowak <krzesimir@xxxxxxxxxx> wrote:
>
> Commit 8184d44c9a57 ("selftests/bpf: skip verifier tests for
> unsupported program types") added a check for an unsupported program
> type. The function doing it changes errno, so test_verifier should
> save it before calling it if test_verifier wants to print a reason why
> verifying a BPF program of a supported type failed.
>
> Changes since v2:
> - Move the declaration to fit the reverse christmas tree style.
>
> Fixes: 8184d44c9a57 ("selftests/bpf: skip verifier tests for unsupported program types")
> Cc: Stanislav Fomichev <sdf@xxxxxxxxxx>
> Signed-off-by: Krzesimir Nowak <krzesimir@xxxxxxxxxx>
> ---
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
> tools/testing/selftests/bpf/test_verifier.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
> index 3fe126e0083b..c7541f572932 100644
> --- a/tools/testing/selftests/bpf/test_verifier.c
> +++ b/tools/testing/selftests/bpf/test_verifier.c
> @@ -864,6 +864,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
> int run_errs, run_successes;
> int map_fds[MAX_NR_MAPS];
> const char *expected_err;
> + int saved_errno;
> int fixup_skips;
nit: combine those ints? or even with i and err below as well?
> __u32 pflags;
> int i, err;
> @@ -894,6 +895,7 @@ 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), 4);
> + saved_errno = errno;
> if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
> printf("SKIP (unsupported program type %d)\n", prog_type);
> skips++;
> @@ -910,7 +912,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
> if (expected_ret == ACCEPT) {
> if (fd_prog < 0) {
> printf("FAIL\nFailed to load prog '%s'!\n",
> - strerror(errno));
> + strerror(saved_errno));
> goto fail_log;
> }
> #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
> --
> 2.20.1
>
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