From: Christian Brauner Date: Tue, 28 Oct 2025 08:45:55 +0000 (+0100) Subject: selftests/pidfd: add first supported_mask test X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e12f734208c5415a7fef92bafcc572afbd9ec8e8;p=thirdparty%2Fkernel%2Flinux.git selftests/pidfd: add first supported_mask test Verify that when PIDFD_INFO_SUPPORTED_MASK is requested, the kernel returns the supported_mask field indicating which flags the kernel supports. Link: https://patch.msgid.link/20251028-work-coredump-signal-v1-10-ca449b7b7aa0@kernel.org Reviewed-by: Alexander Mikhalitsyn Signed-off-by: Christian Brauner --- diff --git a/tools/testing/selftests/pidfd/pidfd_info_test.c b/tools/testing/selftests/pidfd/pidfd_info_test.c index a0eb6e81eaa26..b31a0597fbae6 100644 --- a/tools/testing/selftests/pidfd/pidfd_info_test.c +++ b/tools/testing/selftests/pidfd/pidfd_info_test.c @@ -690,4 +690,45 @@ TEST_F(pidfd_info, thread_group_exec_thread) EXPECT_EQ(close(pidfd_thread), 0); } +/* + * Test: PIDFD_INFO_SUPPORTED_MASK field + * + * Verify that when PIDFD_INFO_SUPPORTED_MASK is requested, the kernel + * returns the supported_mask field indicating which flags the kernel supports. + */ +TEST(supported_mask_field) +{ + struct pidfd_info info = { + .mask = PIDFD_INFO_SUPPORTED_MASK, + }; + int pidfd; + pid_t pid; + + pid = create_child(&pidfd, 0); + ASSERT_GE(pid, 0); + + if (pid == 0) + pause(); + + /* Request supported_mask field */ + ASSERT_EQ(ioctl(pidfd, PIDFD_GET_INFO, &info), 0); + + /* Verify PIDFD_INFO_SUPPORTED_MASK is set in the reply */ + ASSERT_TRUE(!!(info.mask & PIDFD_INFO_SUPPORTED_MASK)); + + /* Verify supported_mask contains expected flags */ + ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_PID)); + ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_CREDS)); + ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_CGROUPID)); + ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_EXIT)); + ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_COREDUMP)); + ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_SUPPORTED_MASK)); + ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_COREDUMP_SIGNAL)); + + /* Clean up */ + sys_pidfd_send_signal(pidfd, SIGKILL, NULL, 0); + sys_waitid(P_PIDFD, pidfd, NULL, WEXITED); + close(pidfd); +} + TEST_HARNESS_MAIN