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Message-ID: <b063403a-9386-1344-732d-36d950e5ced2@kernel.org>
Date: Mon, 28 Aug 2017 10:42:41 -0600
From: Shuah Khan <shuah@...nel.org>
To: Mickaël Salaün <mic@...ikod.net>,
linux-kernel@...r.kernel.org
Cc: Andy Lutomirski <luto@...capital.net>,
Kees Cook <keescook@...omium.org>,
Will Drewry <wad@...omium.org>,
linux-kselftest@...r.kernel.org,
Shuah Khan <shuahkh@....samsung.com>,
Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v1] selftests: Enhance kselftest_harness.h to print which
assert failed
On 08/06/2017 05:23 PM, Mickaël Salaün wrote:
> When a test process is not able to write to TH_LOG_STREAM, this step
> mechanism enable to print the assert number which triggered the failure.
> This can be enabled by setting _metadata->no_print to true at the
> beginning of the test sequence.
>
> Update the seccomp-bpf test to return 0 if a test succeeded.
>
> This feature is needed for the Landlock tests.
>
> Signed-off-by: Mickaël Salaün <mic@...ikod.net>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: Will Drewry <wad@...omium.org>
> Link: https://lkml.kernel.org/r/CAGXu5j+D-FP8Kt9unNOqKrQJP4DYTpmgkJxWykZyrYiVPz3Y3Q@mail.gmail.com
I am looking through my Inbox and found this one. Okay to pull
this in for 4.14-rc1?
thanks,
-- Shuah
> ---
>
> Changes since the patch from the Landlock series:
> * add the step counter in assert/expect macros and use _metadata to
> enable the counter (suggested by Kees Cook)
> * only count asserts
> * add documentation
> ---
> tools/testing/selftests/kselftest_harness.h | 39 +++++++++++++++++++++++----
> tools/testing/selftests/seccomp/seccomp_bpf.c | 2 +-
> 2 files changed, 35 insertions(+), 6 deletions(-)
>
> diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
> index c56f72e07cd7..e81bd28bdd89 100644
> --- a/tools/testing/selftests/kselftest_harness.h
> +++ b/tools/testing/selftests/kselftest_harness.h
> @@ -51,6 +51,9 @@
> #define __KSELFTEST_HARNESS_H
>
> #define _GNU_SOURCE
> +#include <asm/types.h>
> +#include <errno.h>
> +#include <stdbool.h>
> #include <stdint.h>
> #include <stdio.h>
> #include <stdlib.h>
> @@ -84,6 +87,14 @@
> * E.g., #define TH_LOG_ENABLED 1
> *
> * If no definition is provided, logging is enabled by default.
> + *
> + * If there is no way to print an error message for the process running the
> + * test (e.g. not allowed to write to stderr), it is still possible to get the
> + * ASSERT_* number for which the test failed. This behavior can be enabled by
> + * writing `_metadata->no_print = true;` before the check sequence that is
> + * unable to print. When an error occur, instead of printing an error message
> + * and calling `abort(3)`, the test process call `_exit(2)` with the assert
> + * number as argument, which is then printed by the parent process.
> */
> #define TH_LOG(fmt, ...) do { \
> if (TH_LOG_ENABLED) \
> @@ -555,12 +566,18 @@
> * return while still providing an optional block to the API consumer.
> */
> #define OPTIONAL_HANDLER(_assert) \
> - for (; _metadata->trigger; _metadata->trigger = __bail(_assert))
> + for (; _metadata->trigger; _metadata->trigger = \
> + __bail(_assert, _metadata->no_print, _metadata->step))
> +
> +#define __INC_STEP(_metadata) \
> + if (_metadata->passed && _metadata->step < 255) \
> + _metadata->step++;
>
> #define __EXPECT(_expected, _seen, _t, _assert) do { \
> /* Avoid multiple evaluation of the cases */ \
> __typeof__(_expected) __exp = (_expected); \
> __typeof__(_seen) __seen = (_seen); \
> + if (_assert) __INC_STEP(_metadata); \
> if (!(__exp _t __seen)) { \
> unsigned long long __exp_print = (uintptr_t)__exp; \
> unsigned long long __seen_print = (uintptr_t)__seen; \
> @@ -576,6 +593,7 @@
> #define __EXPECT_STR(_expected, _seen, _t, _assert) do { \
> const char *__exp = (_expected); \
> const char *__seen = (_seen); \
> + if (_assert) __INC_STEP(_metadata); \
> if (!(strcmp(__exp, __seen) _t 0)) { \
> __TH_LOG("Expected '%s' %s '%s'.", __exp, #_t, __seen); \
> _metadata->passed = 0; \
> @@ -590,6 +608,8 @@ struct __test_metadata {
> int termsig;
> int passed;
> int trigger; /* extra handler after the evaluation */
> + __u8 step;
> + bool no_print; /* manual trigger when TH_LOG_STREAM is not available */
> struct __test_metadata *prev, *next;
> };
>
> @@ -634,10 +654,13 @@ static inline void __register_test(struct __test_metadata *t)
> }
> }
>
> -static inline int __bail(int for_realz)
> +static inline int __bail(int for_realz, bool no_print, __u8 step)
> {
> - if (for_realz)
> + if (for_realz) {
> + if (no_print)
> + _exit(step);
> abort();
> + }
> return 0;
> }
>
> @@ -655,18 +678,24 @@ void __run_test(struct __test_metadata *t)
> t->passed = 0;
> } else if (child_pid == 0) {
> t->fn(t);
> - _exit(t->passed);
> + /* return the step that failed or 0 */
> + _exit(t->passed ? 0 : t->step);
> } else {
> /* TODO(wad) add timeout support. */
> waitpid(child_pid, &status, 0);
> if (WIFEXITED(status)) {
> - t->passed = t->termsig == -1 ? WEXITSTATUS(status) : 0;
> + t->passed = t->termsig == -1 ? !WEXITSTATUS(status) : 0;
> if (t->termsig != -1) {
> 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 if (WIFSIGNALED(status)) {
> t->passed = 0;
> diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
> index 73f5ea6778ce..4d6f92a9df6b 100644
> --- a/tools/testing/selftests/seccomp/seccomp_bpf.c
> +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
> @@ -107,7 +107,7 @@ TEST(mode_strict_support)
> ASSERT_EQ(0, ret) {
> TH_LOG("Kernel does not support CONFIG_SECCOMP");
> }
> - syscall(__NR_exit, 1);
> + syscall(__NR_exit, 0);
> }
>
> TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)
>
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