[LTP] [PATCH v5 14/16] Add statmount08 test

[Andrea Cervesato]

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

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

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                  |  1 +
 testcases/kernel/syscalls/statmount/.gitignore    |  1 +
 testcases/kernel/syscalls/statmount/statmount08.c | 65 +++++++++++++++++++++++
 3 files changed, 67 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index bf222e466..f8ae25344 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1581,6 +1581,7 @@ statmount04 statmount04
 statmount05 statmount05
 statmount06 statmount06
 statmount07 statmount07
+statmount08 statmount08
 
 statfs01 statfs01
 statfs01_64 statfs01_64
diff --git a/testcases/kernel/syscalls/statmount/.gitignore b/testcases/kernel/syscalls/statmount/.gitignore
index b2a55c077..6106fcf07 100644
--- a/testcases/kernel/syscalls/statmount/.gitignore
+++ b/testcases/kernel/syscalls/statmount/.gitignore
@@ -5,3 +5,4 @@ statmount04
 statmount05
 statmount06
 statmount07
+statmount08
diff --git a/testcases/kernel/syscalls/statmount/statmount08.c b/testcases/kernel/syscalls/statmount/statmount08.c
new file mode 100644
index 000000000..21b8b7342
--- /dev/null
+++ b/testcases/kernel/syscalls/statmount/statmount08.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Verify that statmount() raises EPERM when mount point is not accessible.
+ */
+
+#define _GNU_SOURCE
+
+#include <pwd.h>
+#include "statmount.h"
+#include "lapi/stat.h"
+
+static struct statmount *st_mount;
+static uint64_t root_id;
+static gid_t nobody_gid;
+static uid_t nobody_uid;
+
+static void run(void)
+{
+	if (SAFE_FORK())
+		return;
+
+	SAFE_SETEGID(nobody_gid);
+	SAFE_SETEUID(nobody_uid);
+
+	memset(st_mount, 0, sizeof(struct statmount));
+
+	TST_EXP_FAIL(statmount(root_id,	STATMOUNT_SB_BASIC, st_mount,
+		sizeof(struct statmount), 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",
+	.bufs = (struct tst_buffers []) {
+		{&st_mount, .size = sizeof(struct statmount)},
+		{}
+	}
+};

-- 
2.43.0