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Date: Mon, 13 Jul 2020 12:08:08 -0700
From: Ralph Campbell <rcampbell@...dia.com>
To: Kees Cook <keescook@...omium.org>, Shuah Khan <shuah@...nel.org>
CC: 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 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
ok 2 hmm.anon_read
# RUN hmm.anon_read_prot ...
# Too many test steps (255)!?
# OK hmm.anon_read_prot
ok 3 hmm.anon_read_prot
# RUN hmm.anon_write ...
# Too many test steps (255)!?
# OK hmm.anon_write
ok 4 hmm.anon_write
# RUN hmm.anon_write_prot ...
# Too many test steps (255)!?
# OK hmm.anon_write_prot
ok 5 hmm.anon_write_prot
# RUN hmm.anon_write_child ...
# Too many test steps (255)!?
# OK hmm.anon_write_child
ok 6 hmm.anon_write_child
# RUN hmm.anon_write_child_shared ...
# Too many test steps (255)!?
# OK hmm.anon_write_child_shared
ok 7 hmm.anon_write_child_shared
# RUN hmm.anon_write_huge ...
# Too many test steps (255)!?
# OK hmm.anon_write_huge
ok 8 hmm.anon_write_huge
# RUN hmm.anon_write_hugetlbfs ...
# Too many test steps (255)!?
# OK hmm.anon_write_hugetlbfs
ok 9 hmm.anon_write_hugetlbfs
# RUN hmm.file_read ...
# Too many test steps (255)!?
# OK hmm.file_read
ok 10 hmm.file_read
# RUN hmm.file_write ...
# Too many test steps (255)!?
# OK hmm.file_write
ok 11 hmm.file_write
# RUN hmm.migrate ...
# Too many test steps (255)!?
# OK hmm.migrate
ok 12 hmm.migrate
# RUN hmm.migrate_fault ...
# Too many test steps (255)!?
# OK hmm.migrate_fault
ok 13 hmm.migrate_fault
# RUN hmm.migrate_shared ...
# OK hmm.migrate_shared
ok 14 hmm.migrate_shared
# RUN hmm.migrate_multiple ...
# Too many test steps (255)!?
# OK hmm.migrate_multiple
ok 15 hmm.migrate_multiple
# RUN hmm.anon_read_multiple ...
# Too many test steps (255)!?
# OK hmm.anon_read_multiple
ok 16 hmm.anon_read_multiple
# RUN hmm.anon_teardown ...
# Too many test steps (255)!?
# OK hmm.anon_teardown
ok 17 hmm.anon_teardown
# RUN hmm2.migrate_mixed ...
# OK hmm2.migrate_mixed
ok 18 hmm2.migrate_mixed
# RUN hmm2.snapshot ...
# OK hmm2.snapshot
ok 19 hmm2.snapshot
# RUN hmm2.double_map ...
# Too many test steps (255)!?
# OK hmm2.double_map
ok 20 hmm2.double_map
# PASSED: 20 / 20 tests passed.
# Totals: pass:20 fail:0 xfail:0 xpass:0 skip:0 error:0
> + /* Use 255 for SKIP */
> + if (t->skip)
> + _exit(255);
> + /* Pass is exit 0 */
> + if (t->passed)
> + _exit(0);
> + /* Something else happened, report the step. */
> + _exit(t->step);
> } else {
> __wait_for_test(t);
> }
> ksft_print_msg(" %4s %s%s%s.%s\n", t->passed ? "OK" : "FAIL",
> f->name, variant->name[0] ? "." : "", variant->name, t->name);
> - ksft_test_result(t->passed, "%s%s%s.%s\n",
> - f->name, variant->name[0] ? "." : "", variant->name, t->name);
> +
> + if (t->skip)
> + ksft_test_result_skip("%s%s%s.%s\n",
> + f->name, variant->name[0] ? "." : "", variant->name, t->name);
> + else
> + ksft_test_result(t->passed, "%s%s%s.%s\n",
> + f->name, variant->name[0] ? "." : "", variant->name, t->name);
> }
>
> static int test_harness_run(int __attribute__((unused)) argc,
> diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
> index 252140a52553..8c1cc8033c09 100644
> --- a/tools/testing/selftests/seccomp/seccomp_bpf.c
> +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
> @@ -3069,7 +3069,7 @@ TEST(get_metadata)
>
> /* Only real root can get metadata. */
> if (geteuid()) {
> - XFAIL(return, "get_metadata requires real root");
> + SKIP(return, "get_metadata requires real root");
> return;
> }
>
> @@ -3112,7 +3112,7 @@ TEST(get_metadata)
> ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
> EXPECT_EQ(sizeof(md), ret) {
> if (errno == EINVAL)
> - XFAIL(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
> + SKIP(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
> }
>
> EXPECT_EQ(md.flags, SECCOMP_FILTER_FLAG_LOG);
> @@ -3673,7 +3673,7 @@ TEST(user_notification_continue)
> resp.val = 0;
> EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0) {
> if (errno == EINVAL)
> - XFAIL(goto skip, "Kernel does not support SECCOMP_USER_NOTIF_FLAG_CONTINUE");
> + SKIP(goto skip, "Kernel does not support SECCOMP_USER_NOTIF_FLAG_CONTINUE");
> }
>
> skip:
> @@ -3681,7 +3681,7 @@ TEST(user_notification_continue)
> EXPECT_EQ(true, WIFEXITED(status));
> EXPECT_EQ(0, WEXITSTATUS(status)) {
> if (WEXITSTATUS(status) == 2) {
> - XFAIL(return, "Kernel does not support kcmp() syscall");
> + SKIP(return, "Kernel does not support kcmp() syscall");
> return;
> }
> }
>
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