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Date: Mon, 13 Jul 2020 17:13:08 -0700
From: Kees Cook <keescook@...omium.org>
To: Ralph Campbell <rcampbell@...dia.com>
Cc: Shuah Khan <shuah@...nel.org>,
Christian Brauner <christian@...uner.io>,
David Gow <davidgow@...gle.com>,
Frank Rowand <frowand.list@...il.com>,
Paolo Bonzini <pbonzini@...hat.com>,
"Bird, Tim" <Tim.Bird@...y.com>,
Brendan Higgins <brendanhiggins@...gle.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andy Lutomirski <luto@...capital.net>,
Will Drewry <wad@...omium.org>,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/8] selftests/harness: Refactor XFAIL into SKIP
On Mon, Jul 13, 2020 at 12:08:08PM -0700, Ralph Campbell wrote:
>
> On 6/22/20 11:16 AM, Kees Cook wrote:
> > Plumb the old XFAIL result into a TAP SKIP.
> >
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> > tools/testing/selftests/kselftest_harness.h | 64 ++++++++++++++-----
> > tools/testing/selftests/seccomp/seccomp_bpf.c | 8 +--
> > 2 files changed, 52 insertions(+), 20 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
> > index f8f7e47c739a..b519765904a6 100644
> > --- a/tools/testing/selftests/kselftest_harness.h
> > +++ b/tools/testing/selftests/kselftest_harness.h
> > @@ -112,22 +112,22 @@
> > __FILE__, __LINE__, _metadata->name, ##__VA_ARGS__)
> > /**
> > - * XFAIL(statement, fmt, ...)
> > + * SKIP(statement, fmt, ...)
> > *
> > - * @statement: statement to run after reporting XFAIL
> > + * @statement: statement to run after reporting SKIP
> > * @fmt: format string
> > * @...: optional arguments
> > *
> > - * This forces a "pass" after reporting a failure with an XFAIL prefix,
> > + * This forces a "pass" after reporting why something is being skipped
> > * and runs "statement", which is usually "return" or "goto skip".
> > */
> > -#define XFAIL(statement, fmt, ...) do { \
> > +#define SKIP(statement, fmt, ...) do { \
> > if (TH_LOG_ENABLED) { \
> > - fprintf(TH_LOG_STREAM, "# XFAIL " fmt "\n", \
> > + fprintf(TH_LOG_STREAM, "# SKIP " fmt "\n", \
> > ##__VA_ARGS__); \
> > } \
> > - /* TODO: find a way to pass xfail to test runner process. */ \
> > _metadata->passed = 1; \
> > + _metadata->skip = 1; \
> > _metadata->trigger = 0; \
> > statement; \
> > } while (0)
> > @@ -777,6 +777,7 @@ struct __test_metadata {
> > struct __fixture_metadata *fixture;
> > int termsig;
> > int passed;
> > + int skip; /* did SKIP get used? */
> > int trigger; /* extra handler after the evaluation */
> > int timeout; /* seconds to wait for test timeout */
> > bool timed_out; /* did this test timeout instead of exiting? */
> > @@ -866,17 +867,31 @@ void __wait_for_test(struct __test_metadata *t)
> > fprintf(TH_LOG_STREAM,
> > "# %s: Test terminated by timeout\n", t->name);
> > } else if (WIFEXITED(status)) {
> > - t->passed = t->termsig == -1 ? !WEXITSTATUS(status) : 0;
> > if (t->termsig != -1) {
> > + t->passed = 0;
> > fprintf(TH_LOG_STREAM,
> > "# %s: Test exited normally instead of by signal (code: %d)\n",
> > t->name,
> > WEXITSTATUS(status));
> > - } else if (!t->passed) {
> > - fprintf(TH_LOG_STREAM,
> > - "# %s: Test failed at step #%d\n",
> > - t->name,
> > - WEXITSTATUS(status));
> > + } else {
> > + switch (WEXITSTATUS(status)) {
> > + /* Success */
> > + case 0:
> > + t->passed = 1;
> > + break;
> > + /* SKIP */
> > + case 255:
> > + t->passed = 1;
> > + t->skip = 1;
> > + break;
> > + /* Other failure, assume step report. */
> > + default:
> > + t->passed = 0;
> > + fprintf(TH_LOG_STREAM,
> > + "# %s: Test failed at step #%d\n",
> > + t->name,
> > + WEXITSTATUS(status));
> > + }
> > }
> > } else if (WIFSIGNALED(status)) {
> > t->passed = 0;
> > @@ -906,6 +921,7 @@ void __run_test(struct __fixture_metadata *f,
> > {
> > /* reset test struct */
> > t->passed = 1;
> > + t->skip = 0;
> > t->trigger = 0;
> > t->step = 0;
> > t->no_print = 0;
> > @@ -918,15 +934,31 @@ void __run_test(struct __fixture_metadata *f,
> > t->passed = 0;
> > } else if (t->pid == 0) {
> > t->fn(t, variant);
> > - /* return the step that failed or 0 */
> > - _exit(t->passed ? 0 : t->step);
> > + /* Make sure step doesn't get lost in reporting */
> > + if (t->step >= 255) {
> > + ksft_print_msg("Too many test steps (%u)!?\n", t->step);
> > + t->step = 254;
> > + }
>
> I noticed that this message is now appearing in the HMM self tests.
> I haven't quite tracked down why ->steps should be 255 after running
> the first test. I did notice that ASSERT*() calls __INC_STEP() but
> that doesn't explain it.
> Separately, maybe __INC_STEP() should check for < 254 instead of < 255?
>
> Set CONFIG_HMM_TESTS=m, build and install kernel and modules.
> cd tools/testing/selftests/vm
> make
> ./test_hmm.sh smoke
> Running smoke test. Note, this test provides basic coverage.
> [ 106.803476] memmap_init_zone_device initialised 65536 pages in 7ms
> [ 106.810141] added new 256 MB chunk (total 1 chunks, 256 MB) PFNs [0x3ffff0000 0x400000000)
> [ 106.823703] memmap_init_zone_device initialised 65536 pages in 4ms
> [ 106.829968] added new 256 MB chunk (total 1 chunks, 256 MB) PFNs [0x3fffe0000 0x3ffff0000)
> [ 106.838655] HMM test module loaded. This is only for testing HMM.
> TAP version 13
> 1..20
> # Starting 20 tests from 3 test cases.
> # RUN hmm.open_close ...
> # OK hmm.open_close
> ok 1 hmm.open_close
> # RUN hmm.anon_read ...
> # Too many test steps (255)!?
> # OK hmm.anon_read
Oooh:
#define NTIMES 256
Yes, that's a lot of steps. :)
I agree,__ INC_STEP() needs adjustment, though it should be 253. Does
this work for you?
diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 935029d4fb21..4f78e4805633 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -680,7 +680,8 @@
__bail(_assert, _metadata->no_print, _metadata->step))
#define __INC_STEP(_metadata) \
- if (_metadata->passed && _metadata->step < 255) \
+ /* Keep "step" below 255 (which is used for "SKIP" reporting). */ \
+ if (_metadata->passed && _metadata->step < 253) \
_metadata->step++;
#define is_signed_type(var) (!!(((__typeof__(var))(-1)) < (__typeof__(var))1))
@@ -976,12 +977,6 @@ void __run_test(struct __fixture_metadata *f,
t->passed = 0;
} else if (t->pid == 0) {
t->fn(t, variant);
- /* Make sure step doesn't get lost in reporting */
- if (t->step >= 255) {
- ksft_print_msg("Too many test steps (%u)!?\n", t->step);
- t->step = 254;
- }
- /* Use 255 for SKIP */
if (t->skip)
_exit(255);
/* Pass is exit 0 */
--
Kees Cook
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