[LTP] [PATCH v4 7/8] Add ioctl_pidfd05 test

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Verify that ioctl() raises an EINVAL error when PIDFD_GET_INFO
is used. This happens when:

- info parameter is NULL
- info parameter is providing the wrong size

Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                |  1 +
 testcases/kernel/syscalls/ioctl/.gitignore      |  1 +
 testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c | 59 +++++++++++++++++++++++++
 3 files changed, 61 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index 3d0789bee7d4723f6af549eace1e14e358e17220..118a863ba8d86e1d8a7d3cff3e7fa09d0e137413 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -617,6 +617,7 @@ ioctl_pidfd01 ioctl_pidfd01
 ioctl_pidfd02 ioctl_pidfd02
 ioctl_pidfd03 ioctl_pidfd03
 ioctl_pidfd04 ioctl_pidfd04
+ioctl_pidfd05 ioctl_pidfd05
 
 inotify_init1_01 inotify_init1_01
 inotify_init1_02 inotify_init1_02
diff --git a/testcases/kernel/syscalls/ioctl/.gitignore b/testcases/kernel/syscalls/ioctl/.gitignore
index b92cb5d33fe05652874c5ba4027c8521528f8ecc..09963c3896fb124ef1149bbd743537dd691400ee 100644
--- a/testcases/kernel/syscalls/ioctl/.gitignore
+++ b/testcases/kernel/syscalls/ioctl/.gitignore
@@ -34,3 +34,4 @@
 /ioctl_pidfd02
 /ioctl_pidfd03
 /ioctl_pidfd04
+/ioctl_pidfd05
diff --git a/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c b/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c
new file mode 100644
index 0000000000000000000000000000000000000000..c379717b3bea70bcf11195abf967b555914a64cd
--- /dev/null
+++ b/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2025 Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * Verify that ioctl() raises an EINVAL error when PIDFD_GET_INFO is used. This
+ * happens when:
+ *
+ * - info parameter is NULL
+ * - info parameter is providing the wrong size
+ */
+
+#include "tst_test.h"
+#include "lapi/pidfd.h"
+#include "lapi/sched.h"
+#include "lapi/ioctl.h"
+
+struct pidfd_info_invalid {
+	uint32_t dummy;
+};
+
+#define PIDFD_GET_INFO_SHORT _IOWR(PIDFS_IOCTL_MAGIC, 11, struct pidfd_info_invalid)
+
+static struct tst_clone_args *args;
+static struct pidfd_info_invalid *info_invalid;
+
+static void run(void)
+{
+	int pidfd = 0;
+	pid_t pid_child;
+
+	memset(args, 0, sizeof(struct tst_clone_args));
+
+	info_invalid->dummy = 1;
+
+	args->flags = CLONE_PIDFD | CLONE_NEWUSER | CLONE_NEWPID;
+	args->pidfd = (uint64_t)&pidfd;
+	args->exit_signal = SIGCHLD;
+
+	pid_child = SAFE_CLONE(args);
+	if (!pid_child)
+		exit(0);
+
+	TST_EXP_FAIL(ioctl(pidfd, PIDFD_GET_INFO, NULL), EINVAL);
+	TST_EXP_FAIL(ioctl(pidfd, PIDFD_GET_INFO_SHORT, info_invalid), EINVAL);
+
+	SAFE_CLOSE(pidfd);
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.forks_child = 1,
+	.bufs = (struct tst_buffers []) {
+		{&args, .size = sizeof(*args)},
+		{&info_invalid, .size = sizeof(*info_invalid)},
+		{}
+	}
+};

-- 
2.50.1