[LTP] [PATCH v6 15/16] Add listmount03 test

[Andrea Cervesato]

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

Verify that listmount() raises EPERM when mount point is not accessible.

Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                  |  1 +
 testcases/kernel/syscalls/listmount/.gitignore    |  1 +
 testcases/kernel/syscalls/listmount/listmount03.c | 62 +++++++++++++++++++++++
 3 files changed, 64 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index f8ae25344..7e6d7aacf 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -733,6 +733,7 @@ listen01 listen01
 
 listmount01 listmount01
 listmount02 listmount02
+listmount03 listmount03
 
 listxattr01 listxattr01
 listxattr02 listxattr02
diff --git a/testcases/kernel/syscalls/listmount/.gitignore b/testcases/kernel/syscalls/listmount/.gitignore
index 30bbf9f02..e4273f319 100644
--- a/testcases/kernel/syscalls/listmount/.gitignore
+++ b/testcases/kernel/syscalls/listmount/.gitignore
@@ -1,2 +1,3 @@
 listmount01
 listmount02
+listmount03
diff --git a/testcases/kernel/syscalls/listmount/listmount03.c b/testcases/kernel/syscalls/listmount/listmount03.c
new file mode 100644
index 000000000..befe0edaf
--- /dev/null
+++ b/testcases/kernel/syscalls/listmount/listmount03.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Verify that listmount() raises EPERM when mount point is not accessible.
+ */
+
+#define _GNU_SOURCE
+
+#include <pwd.h>
+#include "listmount.h"
+#include "lapi/stat.h"
+
+#define LISTSIZE 32
+
+static uint64_t root_id;
+static gid_t nobody_gid;
+static uid_t nobody_uid;
+
+static void run(void)
+{
+	if (SAFE_FORK())
+		return;
+
+	uint64_t list[LISTSIZE];
+
+	SAFE_SETEGID(nobody_gid);
+	SAFE_SETEUID(nobody_uid);
+
+	TST_EXP_FAIL(listmount(root_id, 0, list, LISTSIZE, 0), EPERM);
+
+	exit(0);
+}
+
+static void setup(void)
+{
+	struct ltp_statx sx;
+	struct passwd *pw;
+
+	pw = SAFE_GETPWNAM("nobody");
+	nobody_gid = pw->pw_gid;
+	nobody_uid = pw->pw_uid;
+
+	SAFE_STATX(AT_FDCWD, "/", 0, STATX_MNT_ID_UNIQUE, &sx);
+	root_id = sx.data.stx_mnt_id;
+
+	SAFE_CHROOT(tst_tmpdir_path());
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+	.forks_child = 1,
+	.min_kver = "6.8",
+};
+

-- 
2.43.0