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From: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= <mic@digikod.net>
To: Christian Brauner <brauner@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jakub Kicinski <kuba@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Mark Brown <broonie@kernel.org>,
	Sasha Levin <sashal@kernel.org>,
	Sean Christopherson <seanjc@google.com>,
	Shengyu Li <shengyu.li.evgeny@gmail.com>,
	Shuah Khan <shuah@kernel.org>,
	Shuah Khan <skhan@linuxfoundation.org>
Cc: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= <mic@digikod.net>,
	Bagas Sanjaya <bagasdotme@gmail.com>,
	Brendan Higgins <brendanhiggins@google.com>,
	David Gow <davidgow@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	Florian Fainelli <florian.fainelli@broadcom.com>,
	=?UTF-8?q?G=C3=BCnther=20Noack?= <gnoack@google.com>,
	Jon Hunter <jonathanh@nvidia.com>,
	Ron Economos <re@w6rz.net>,
	Ronald Warsow <rwarsow@gmx.de>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Will Drewry <wad@chromium.org>,
	kernel test robot <oliver.sang@intel.com>,
	kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org,
	netdev@vger.kernel.org,
	stable@vger.kernel.org
Subject: [PATCH v7 08/10] selftests/harness: Share _metadata between forked processes
Date: Sat, 11 May 2024 19:14:43 +0200
Message-ID: <20240511171445.904356-9-mic@digikod.net>
In-Reply-To: <20240511171445.904356-1-mic@digikod.net>
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Unconditionally share _metadata between all forked processes, which
enables to actually catch errors which were previously ignored.

This is required for a following commit replacing vfork() with clone3()
and CLONE_VFORK (i.e. not sharing the full memory) .  It should also be
useful to share _metadata to extend expectations to test process's
forks.  For instance, this change identified a wrong expectation in
pidfd_setns_test.

Because this _metadata is used by the new XFAIL_ADD(), use a global
pointer initialized in TEST_F().  This is OK because only XFAIL_ADD()
use it, and XFAIL_ADD() already depends on TEST_F().

Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Will Drewry <wad@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Link: https://lore.kernel.org/r/20240511171445.904356-9-mic@digikod.net
---

Changes since v6:
* Use a global pointer per TEST_F() and complete build of the
  __test_xfail object in the xfail constructor to fix XFAIL_ADD():
  https://lore.kernel.org/r/202405100339.vfBe0t9C-lkp@intel.com/

Changes since v4:
* Reset _metadata's aborted and setup_completed fields.

Changes since v1:
* Extract change from a bigger patch (suggested by Kees).
---
 tools/testing/selftests/kselftest_harness.h | 26 ++++++++++++---------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 201040207c85..28415798fa60 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -430,19 +430,19 @@ static inline pid_t clone3_vfork(void)
 			kill(getpid(), WTERMSIG(status)); \
 		__test_check_assert(_metadata); \
 	} \
-	static struct __test_metadata \
-		      _##fixture_name##_##test_name##_object = { \
-		.name = #test_name, \
-		.fn = &wrapper_##fixture_name##_##test_name, \
-		.fixture = &_##fixture_name##_fixture_object, \
-		.termsig = signal, \
-		.timeout = tmout, \
-		.teardown_parent = false, \
-	 }; \
+	static struct __test_metadata *_##fixture_name##_##test_name##_object; \
 	static void __attribute__((constructor)) \
 			_register_##fixture_name##_##test_name(void) \
 	{ \
-		__register_test(&_##fixture_name##_##test_name##_object); \
+		struct __test_metadata *object = mmap(NULL, sizeof(*object), \
+			PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0); \
+		object->name = #test_name; \
+		object->fn = &wrapper_##fixture_name##_##test_name; \
+		object->fixture = &_##fixture_name##_fixture_object; \
+		object->termsig = signal; \
+		object->timeout = tmout; \
+		_##fixture_name##_##test_name##_object = object; \
+		__register_test(object); \
 	} \
 	static void fixture_name##_##test_name( \
 		struct __test_metadata __attribute__((unused)) *_metadata, \
@@ -850,11 +850,12 @@ struct __test_xfail {
 	{ \
 		.fixture = &_##fixture_name##_fixture_object, \
 		.variant = &_##fixture_name##_##variant_name##_object, \
-		.test = &_##fixture_name##_##test_name##_object, \
 	}; \
 	static void __attribute__((constructor)) \
 		_register_##fixture_name##_##variant_name##_##test_name##_xfail(void) \
 	{ \
+		_##fixture_name##_##variant_name##_##test_name##_xfail.test = \
+			_##fixture_name##_##test_name##_object; \
 		__register_xfail(&_##fixture_name##_##variant_name##_##test_name##_xfail); \
 	}
 
@@ -1181,6 +1182,9 @@ void __run_test(struct __fixture_metadata *f,
 	/* reset test struct */
 	t->exit_code = KSFT_PASS;
 	t->trigger = 0;
+	t->aborted = false;
+	t->setup_completed = false;
+	memset(t->env, 0, sizeof(t->env));
 	memset(t->results->reason, 0, sizeof(t->results->reason));
 
 	if (asprintf(&test_name, "%s%s%s.%s", f->name,
-- 
2.45.0