[LTP] [PATCH 3/5] Add fchmodat2_01 test

[Andrea Cervesato]

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

This test verifies that fchmodat2() syscall is properly working with
AT_SYMLINK_NOFOLLOW on regular files.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                   |  2 +
 testcases/kernel/syscalls/fchmodat2/.gitignore     |  1 +
 testcases/kernel/syscalls/fchmodat2/Makefile       |  7 +++
 testcases/kernel/syscalls/fchmodat2/fchmodat2.h    | 32 +++++++++++++
 testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c | 54 ++++++++++++++++++++++
 5 files changed, 96 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index cf06ee563..0a28530ed 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -264,6 +264,8 @@ fchmod06 fchmod06
 fchmodat01 fchmodat01
 fchmodat02 fchmodat02
 
+fchmodat2_01 fchmodat2_01
+
 fchown01 fchown01
 fchown01_16 fchown01_16
 fchown02 fchown02
diff --git a/testcases/kernel/syscalls/fchmodat2/.gitignore b/testcases/kernel/syscalls/fchmodat2/.gitignore
new file mode 100644
index 000000000..47d5e2427
--- /dev/null
+++ b/testcases/kernel/syscalls/fchmodat2/.gitignore
@@ -0,0 +1 @@
+fchmodat2_01
diff --git a/testcases/kernel/syscalls/fchmodat2/Makefile b/testcases/kernel/syscalls/fchmodat2/Makefile
new file mode 100644
index 000000000..8cf1b9024
--- /dev/null
+++ b/testcases/kernel/syscalls/fchmodat2/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/fchmodat2/fchmodat2.h b/testcases/kernel/syscalls/fchmodat2/fchmodat2.h
new file mode 100644
index 000000000..676d491cf
--- /dev/null
+++ b/testcases/kernel/syscalls/fchmodat2/fchmodat2.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+#ifndef FCHMODAT2_H
+
+#include "tst_test.h"
+#include "lapi/syscalls.h"
+#include "tst_safe_file_at.h"
+
+static inline int fchmodat2(int dfd, const char *filename, mode_t mode, int flags)
+{
+	int ret;
+
+	ret = tst_syscall(__NR_fchmodat2, dfd, filename, mode, flags);
+	if (ret == -1)
+		tst_brk(TBROK | TERRNO, "%s(%d,%s,%d,%d) error",
+			__func__, dfd, filename, mode, flags);
+
+	return ret;
+}
+
+static inline void verify_mode(int dirfd, const char *path, mode_t mode)
+{
+	struct stat st;
+
+	SAFE_FSTATAT(dirfd, path, &st, AT_SYMLINK_NOFOLLOW);
+	TST_EXP_EQ_LI(st.st_mode, mode);
+}
+
+#endif
diff --git a/testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c b/testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c
new file mode 100644
index 000000000..9f4960a0c
--- /dev/null
+++ b/testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c
@@ -0,0 +1,54 @@
+// 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 regular files.
+ */
+
+#include "fchmodat2.h"
+#include "lapi/fcntl.h"
+
+#define MNTPOINT "mntpoint"
+#define FNAME "myfile"
+
+static int fd_dir = -1;
+
+static void run(void)
+{
+	SAFE_CHMOD(MNTPOINT"/"FNAME, 0640);
+
+	TST_EXP_PASS(fchmodat2(fd_dir, FNAME, 0700, AT_SYMLINK_NOFOLLOW));
+	verify_mode(fd_dir, FNAME, S_IFREG | 0700);
+}
+
+static void setup(void)
+{
+	fd_dir = SAFE_OPEN(MNTPOINT, O_PATH | O_DIRECTORY, 0640);
+
+	SAFE_TOUCH(MNTPOINT"/"FNAME, 0640, NULL);
+}
+
+static void cleanup(void)
+{
+	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