[LTP] [PATCH v2] Add chmod08 test

[Andrea Cervesato]

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

This test has been extracted from symlink01 and it verifies that
chmod() is working correctly on symlink() generated files.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 testcases/kernel/syscalls/chmod/chmod08.c | 61 +++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 testcases/kernel/syscalls/chmod/chmod08.c

diff --git a/testcases/kernel/syscalls/chmod/chmod08.c b/testcases/kernel/syscalls/chmod/chmod08.c
new file mode 100644
index 000000000..f9ca4e45a
--- /dev/null
+++ b/testcases/kernel/syscalls/chmod/chmod08.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
+ *    Author: David Fenner
+ *    Copilot: Jon Hendrickson
+ * Copyright (C) 2024 Andrea Cervesato andrea.cervesato@suse.com
+ */
+
+/*\
+ * [Description]
+ *
+ * This test verifies that chmod() is working correctly on symlink()
+ * generated files.
+ */
+
+#include "tst_test.h"
+
+#define PERMS 01777
+#define TESTFILE "myobject"
+
+static char testfile[PATH_MAX];
+
+static void run(void)
+{
+	char *symname = "my_symlink0";
+	struct stat oldsym_stat;
+	struct stat newsym_stat;
+
+	SAFE_TOUCH(testfile, 0644, NULL);
+	SAFE_SYMLINK(testfile, symname);
+	SAFE_STAT(symname, &oldsym_stat);
+
+	TST_EXP_PASS(chmod(symname, PERMS));
+	SAFE_STAT(symname, &newsym_stat);
+
+	TST_EXP_EQ_LI(newsym_stat.st_mode & PERMS, PERMS);
+	TST_EXP_EXPR(oldsym_stat.st_mode != newsym_stat.st_mode,
+		"file mode has changed");
+
+	SAFE_UNLINK(symname);
+	remove(testfile);
+}
+
+static void setup(void)
+{
+	int tmplen;
+	char *tmpdir;
+
+	tmpdir = tst_get_tmpdir();
+	tmplen = strlen(tmpdir);
+
+	testfile[tmplen] = '/';
+	memcpy(testfile, tmpdir, tmplen);
+	memcpy(testfile + tmplen + 1, TESTFILE, strlen(TESTFILE));
+}
+
+static struct tst_test test = {
+	.setup = setup,
+	.test_all = run,
+	.needs_tmpdir = 1,
+};
-- 
2.35.3