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.
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/20240429191911.2552580-9-mic@digikod.net ---
Changes since v1: * Extract change from a bigger patch (suggested by Kees). --- tools/testing/selftests/kselftest_harness.h | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-)
diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h index 201040207c85..abf2ffd2094f 100644 --- a/tools/testing/selftests/kselftest_harness.h +++ b/tools/testing/selftests/kselftest_harness.h @@ -430,19 +430,17 @@ 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 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; \ + __register_test(object); \ } \ static void fixture_name##_##test_name( \ struct __test_metadata __attribute__((unused)) *_metadata, \