[LTP] [PATCH v6 16/16] Add listmount04 test

[Andrea Cervesato]

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

Verify that listmount() raises the correct errors according with
invalid data:

- EFAULT: req or mnt_id are unaccessible memories
- EINVAL: invalid flags or req with insufficient size

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                  |  1 +
 testcases/kernel/syscalls/listmount/.gitignore    |  1 +
 testcases/kernel/syscalls/listmount/listmount04.c | 97 +++++++++++++++++++++++
 3 files changed, 99 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index 7e6d7aacf..80c4888ee 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -734,6 +734,7 @@ listen01 listen01
 listmount01 listmount01
 listmount02 listmount02
 listmount03 listmount03
+listmount04 listmount04
 
 listxattr01 listxattr01
 listxattr02 listxattr02
diff --git a/testcases/kernel/syscalls/listmount/.gitignore b/testcases/kernel/syscalls/listmount/.gitignore
index e4273f319..4d709bae5 100644
--- a/testcases/kernel/syscalls/listmount/.gitignore
+++ b/testcases/kernel/syscalls/listmount/.gitignore
@@ -1,3 +1,4 @@
 listmount01
 listmount02
 listmount03
+listmount04
diff --git a/testcases/kernel/syscalls/listmount/listmount04.c b/testcases/kernel/syscalls/listmount/listmount04.c
new file mode 100644
index 000000000..638bbf6fe
--- /dev/null
+++ b/testcases/kernel/syscalls/listmount/listmount04.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Verify that listmount() raises the correct errors according with
+ * invalid data:
+ *
+ * - EFAULT: req or mnt_id are unaccessible memories
+ * - EINVAL: invalid flags or req with insufficient size
+ */
+
+#define _GNU_SOURCE
+
+#include "tst_test.h"
+#include "lapi/mount.h"
+#include "lapi/syscalls.h"
+
+#define MNT_SIZE 32
+
+static struct mnt_id_req *request;
+static struct mnt_id_req *request_null;
+static struct mnt_id_req *request_small;
+static uint64_t mnt_ids[MNT_SIZE];
+
+static struct tcase {
+	struct mnt_id_req **req;
+	uint64_t *mnt_ids;
+	size_t nr_mnt_ids;
+	uint64_t flags;
+	int exp_errno;
+	char *msg;
+} tcases[] = {
+	{
+		.req = &request_null,
+		.mnt_ids = mnt_ids,
+		.nr_mnt_ids = MNT_SIZE,
+		.flags = 0,
+		.exp_errno = EFAULT,
+		.msg = "request points to unaccessible memory",
+	},
+	{
+		.req = &request,
+		.mnt_ids = NULL,
+		.nr_mnt_ids = MNT_SIZE,
+		.flags = 0,
+		.exp_errno = EFAULT,
+		.msg = "mnt_ids points to unaccessible memory",
+	},
+	{
+		.req = &request,
+		.mnt_ids = mnt_ids,
+		.nr_mnt_ids = MNT_SIZE,
+		.flags = -1,
+		.exp_errno = EINVAL,
+		.msg = "invalid flags",
+	},
+	{
+		.req = &request_small,
+		.mnt_ids = mnt_ids,
+		.nr_mnt_ids = MNT_SIZE,
+		.flags = 0,
+		.exp_errno = EINVAL,
+		.msg = "request has insufficient size",
+	},
+};
+
+static void run(unsigned int n)
+{
+	struct tcase *tc = &tcases[n];
+
+	TST_EXP_FAIL(tst_syscall(__NR_listmount, *tc->req, tc->mnt_ids,
+		tc->nr_mnt_ids, tc->flags), tc->exp_errno,
+		"%s", tc->msg);
+}
+
+static void setup(void)
+{
+	request->mnt_id = LSMT_ROOT;
+	request->size = MNT_ID_REQ_SIZE_VER0;
+	request->param = 0;
+}
+
+static struct tst_test test = {
+	.test = run,
+	.setup = setup,
+	.tcnt = ARRAY_SIZE(tcases),
+	.min_kver = "6.8",
+	.bufs = (struct tst_buffers []) {
+		{ &request, .size = sizeof(struct mnt_id_req) },
+		{ &request_small, .size = sizeof(struct mnt_id_req) - 4 },
+		{},
+	},
+};

-- 
2.43.0