[LTP] [PATCH v2] mprotect: Add mprotect05 testcase

[Liam R. Howlett]

Add a test that uses mprotect to split and combine VMAs.  Created to
ensure the correctness of the VMA iterator after a bug report.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217061
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---
 .../kernel/syscalls/mprotect/mprotect05.c     | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 testcases/kernel/syscalls/mprotect/mprotect05.c

diff --git a/testcases/kernel/syscalls/mprotect/mprotect05.c b/testcases/kernel/syscalls/mprotect/mprotect05.c
new file mode 100644
index 000000000..974e026ae
--- /dev/null
+++ b/testcases/kernel/syscalls/mprotect/mprotect05.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2023 Oracle and/or its affiliates. All Rights Reserved.
+ * Author: Liam R. Howlett <liam.howlett@oracle.com>
+ */
+
+/*\
+ * [Description]
+ *
+ *	Testcase to check the mprotect(2) system call split and merge
+ *
+ * Reference links:
+ *  - https://bugzilla.kernel.org/show_bug.cgi?id=217061
+ *
+ */
+
+#include <errno.h>
+#include <stdio.h>
+
+#include "tst_test.h"
+
+#define TEST_FILE "mprotect05-testfile"
+
+static int fd;
+static char *addr = MAP_FAILED;
+static unsigned long pagesize;
+static unsigned long fullsize;
+
+static void setup(void)
+{
+	pagesize = getpagesize();
+	fullsize = 5 * pagesize;
+}
+
+static void run(void)
+{
+	fd = SAFE_OPEN(TEST_FILE, O_RDWR | O_CREAT, 0777);
+	addr = SAFE_MMAP(0, fullsize, PROT_READ, MAP_SHARED, fd, 0);
+
+	if (mprotect(addr + pagesize, pagesize, PROT_EXEC))
+		tst_res(TFAIL | TERRNO, "mprotect failed to exec");
+
+	if (mprotect(addr + 3 * pagesize, pagesize, PROT_WRITE))
+		tst_res(TFAIL | TERRNO, "mprotect failed to write");
+
+	if (mprotect(addr + pagesize, pagesize * 4, PROT_READ))
+		tst_res(TFAIL | TERRNO, "mprotect failed to read");
+
+	SAFE_MUNMAP(addr, fullsize);
+	SAFE_CLOSE(fd);
+	addr = MAP_FAILED;
+	SAFE_UNLINK(TEST_FILE);
+	tst_res(TPASS, "test successfull");
+}
+
+static void cleanup(void)
+{
+	if (addr != MAP_FAILED) {
+		SAFE_MUNMAP(addr, fullsize);
+		SAFE_CLOSE(fd);
+	}
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.needs_tmpdir  = 1,
+};
-- 
2.39.2