lkml.org 
[lkml]   [2019]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [bpf-next v3 03/12] selftests/bpf: Avoid another case of errno clobbering
On Thu, Jul 11, 2019 at 1:57 AM Andrii Nakryiko
<andrii.nakryiko@gmail.com> wrote:
>
> On Mon, Jul 8, 2019 at 3:43 PM Krzesimir Nowak <krzesimir@kinvolk.io> 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@google.com>
> > Signed-off-by: Krzesimir Nowak <krzesimir@kinvolk.io>
> > ---
>
> Acked-by: Andrii Nakryiko <andriin@fb.com>
>
> > 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?

Will do.

>
> > __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
> >



--
Kinvolk GmbH | Adalbertstr.6a, 10999 Berlin | tel: +491755589364
Geschäftsführer/Directors: Alban Crequy, Chris Kühl, Iago López Galeiras
Registergericht/Court of registration: Amtsgericht Charlottenburg
Registernummer/Registration number: HRB 171414 B
Ust-ID-Nummer/VAT ID number: DE302207000

\
 
 \ /
  Last update: 2019-07-11 14:06    [W:0.074 / U:30.780 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site