[LTP] [PATCH v4 04/13] Add listmount01 test

Andrea Cervesato
2024-09-09T10:02:05Z

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

This test verifies that listmount() is properly recognizing a mounted
root directory using LSMT_ROOT flag.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
runtest/syscalls | 2 +
testcases/kernel/syscalls/listmount/.gitignore | 1 +
testcases/kernel/syscalls/listmount/Makefile | 7 +++
testcases/kernel/syscalls/listmount/listmount.h | 26 ++++++++++
testcases/kernel/syscalls/listmount/listmount01.c | 63 +++++++++++++++++++++++
5 files changed, 99 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index a9fc8c432..48db6259b 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -730,6 +730,8 @@ linkat02 linkat02

listen01 listen01

+listmount01 listmount01
+
listxattr01 listxattr01
listxattr02 listxattr02
listxattr03 listxattr03
diff --git a/testcases/kernel/syscalls/listmount/.gitignore b/testcases/kernel/syscalls/listmount/.gitignore
new file mode 100644
index 000000000..5257b298c
--- /dev/null
+++ b/testcases/kernel/syscalls/listmount/.gitignore
@@ -0,0 +1 @@
+listmount01
diff --git a/testcases/kernel/syscalls/listmount/Makefile b/testcases/kernel/syscalls/listmount/Makefile
new file mode 100644
index 000000000..8cf1b9024
--- /dev/null
+++ b/testcases/kernel/syscalls/listmount/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+
+top_srcdir ?= ../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/syscalls/listmount/listmount.h b/testcases/kernel/syscalls/listmount/listmount.h
new file mode 100644
index 000000000..93766cd33
--- /dev/null
+++ b/testcases/kernel/syscalls/listmount/listmount.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+#ifndef LISTMOUNT_H
+
+#define _GNU_SOURCE
+
+#include "tst_test.h"
+#include "lapi/mount.h"
+#include "lapi/syscalls.h"
+
+static inline ssize_t listmount(uint64_t mnt_id, uint64_t last_mnt_id,
+ uint64_t list[], size_t num, unsigned int flags)
+{
+ struct mnt_id_req req = {
+ .size = MNT_ID_REQ_SIZE_VER0,
+ .mnt_id = mnt_id,
+ .param = last_mnt_id,
+ };
+
+ return tst_syscall(__NR_listmount, &req, list, num, flags);
+}
+
+#endif
diff --git a/testcases/kernel/syscalls/listmount/listmount01.c b/testcases/kernel/syscalls/listmount/listmount01.c
new file mode 100644
index 000000000..ab74b776b
--- /dev/null
+++ b/testcases/kernel/syscalls/listmount/listmount01.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * This test verifies that listmount() is properly recognizing a mounted
+ * root directory using LSMT_ROOT flag.
+ *
+ * [Algorithm]
+ *
+ * - move into a new unshared namespace
+ * - mount() a root inside temporary folder and get its mount ID
+ * - get list of mounted IDs using listmount(LSMT_ROOT, ..)
+ * - verify that the root mount ID is the only mount ID present inside the list
+ */
+
+#define _GNU_SOURCE
+
+#include "listmount.h"
+#include "lapi/stat.h"
+#include "lapi/sched.h"
+
+#define MNTPOINT "mntpoint"
+#define LISTSIZE 32
+
+static uint64_t root_id;
+
+static void run(void)
+{
+ uint64_t list[LISTSIZE];
+
+ TST_EXP_POSITIVE(listmount(LSMT_ROOT, 0, list, LISTSIZE, 0));
+ if (TST_RET == -1)
+ return;
+
+ TST_EXP_EQ_LI(TST_RET, 1);
+ TST_EXP_EQ_LI(list[0], root_id);
+}
+
+static void setup(void)
+{
+ struct ltp_statx sx;
+
+ SAFE_UNSHARE(CLONE_NEWNS);
+
+ SAFE_CHROOT(MNTPOINT);
+ SAFE_MOUNT("", "/", NULL, MS_REC | MS_PRIVATE, NULL);
+ SAFE_STATX(AT_FDCWD, "/", 0, STATX_MNT_ID_UNIQUE, &sx);
+
+ root_id = sx.data.stx_mnt_id;
+}
+
+static struct tst_test test = {
+ .test_all = run,
+ .setup = setup,
+ .forks_child = 1,
+ .min_kver = "6.8",
+ .mount_device = 1,
+ .mntpoint = MNTPOINT,
+};

--
2.43.0