[LTP] [PATCH 4/5] Add fchmodat2_02 test

[Andrea Cervesato]

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

This test verifies that fchmodat2() syscall is properly working with
AT_SYMLINK_NOFOLLOW on symbolic links.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                   |  1 +
 testcases/kernel/syscalls/fchmodat2/.gitignore     |  1 +
 testcases/kernel/syscalls/fchmodat2/fchmodat2_02.c | 63 ++++++++++++++++++++++
 3 files changed, 65 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index 0a28530ed..c3712da36 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -265,6 +265,7 @@ fchmodat01 fchmodat01
 fchmodat02 fchmodat02
 
 fchmodat2_01 fchmodat2_01
+fchmodat2_02 fchmodat2_02
 
 fchown01 fchown01
 fchown01_16 fchown01_16
diff --git a/testcases/kernel/syscalls/fchmodat2/.gitignore b/testcases/kernel/syscalls/fchmodat2/.gitignore
index 47d5e2427..9f713198c 100644
--- a/testcases/kernel/syscalls/fchmodat2/.gitignore
+++ b/testcases/kernel/syscalls/fchmodat2/.gitignore
@@ -1 +1,2 @@
 fchmodat2_01
+fchmodat2_02
diff --git a/testcases/kernel/syscalls/fchmodat2/fchmodat2_02.c b/testcases/kernel/syscalls/fchmodat2/fchmodat2_02.c
new file mode 100644
index 000000000..4afe7f3f9
--- /dev/null
+++ b/testcases/kernel/syscalls/fchmodat2/fchmodat2_02.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 fchmodat2() syscall is properly working with
+ * AT_SYMLINK_NOFOLLOW on symbolic links.
+ */
+
+#include "fchmodat2.h"
+#include "lapi/fcntl.h"
+
+#define MNTPOINT "mntpoint"
+#define FNAME "myfile"
+#define SNAME "symlink"
+
+static int fd_dir = -1;
+
+static void run(void)
+{
+	SAFE_CHMOD(MNTPOINT"/"FNAME, 0640);
+
+	TST_EXP_PASS(fchmodat2(fd_dir, SNAME, 0700, 0));
+	verify_mode(fd_dir, FNAME, S_IFREG | 0700);
+	verify_mode(fd_dir, SNAME, S_IFLNK | 0777);
+
+	TST_EXP_PASS(fchmodat2(fd_dir, SNAME, 0640, AT_SYMLINK_NOFOLLOW));
+	verify_mode(fd_dir, FNAME, S_IFREG | 0700);
+	verify_mode(fd_dir, SNAME, S_IFLNK | 0640);
+}
+
+static void setup(void)
+{
+	fd_dir = SAFE_OPEN(MNTPOINT, O_PATH | O_DIRECTORY, 0640);
+
+	SAFE_TOUCH(MNTPOINT"/"FNAME, 0640, NULL);
+	SAFE_SYMLINKAT(FNAME, fd_dir, SNAME);
+}
+
+static void cleanup(void)
+{
+	SAFE_UNLINKAT(fd_dir, SNAME, 0);
+
+	if (fd_dir != -1)
+		SAFE_CLOSE(fd_dir);
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.min_kver = "6.6",
+	.mntpoint = MNTPOINT,
+	.format_device = 1,
+	.all_filesystems = 1,
+	.skip_filesystems = (const char *const []) {
+		"fuse",
+		NULL
+	},
+};

-- 
2.35.3