Kernel: Add a test for multi-region mprotect

Tests/Kernel/mprotect-multi-region-mrotect.cpp

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Format.h>
+#include <AK/Types.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+int main()
+{
+ printf("Testing full unnmap\n");
+ auto* map1 = mmap(nullptr, 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+ if (map1 == MAP_FAILED) {
+ perror("mmap 1");
+ return 1;
+ }
+ auto* map2 = mmap((void*)((FlatPtr)map1 + 2 * PAGE_SIZE), 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+ if (map2 == MAP_FAILED) {
+ perror("mmap 2");
+ return 1;
+ }
+ auto* map3 = mmap((void*)((FlatPtr)map1 + 4 * PAGE_SIZE), 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+ if (map3 == MAP_FAILED) {
+ perror("mmap 3");
+ return 1;
+ }
+
+ // really allocating pages
+ memset(map1, 0x01, 6 * PAGE_SIZE);
+
+ int rc;
+
+ outln("Mprotect 3 ranges [2, 2 ,2]");
+ rc = mprotect(map1, 6 * PAGE_SIZE, PROT_READ);
+ if (rc) {
+ perror("mprotect full");
+ return 1;
+ }
+
+ outln("Mprotect 3 ranges [-1, 2 ,1-]");
+ rc = mprotect((void*)((FlatPtr)map1 + PAGE_SIZE), 4 * PAGE_SIZE, PROT_READ);
+ if (rc) {
+ perror("mprotect partial");
+ return 1;
+ }
+
+ outln("unmapping");
+ munmap(map2, 2 * PAGE_SIZE);
+
+ outln("Mprotect 2 ranges [2, -- ,2] -> Error");
+ rc = mprotect(map1, 6 * PAGE_SIZE, PROT_READ);
+ if (!rc) {
+ perror("mprotect full over missing succeded");
+ return 1;
+ }
+
+ outln("Mprotect 3 ranges [-1, -- ,1-] -> Error");
+ rc = mprotect((void*)((FlatPtr)map1 + PAGE_SIZE), 4 * PAGE_SIZE, PROT_READ);
+ if (!rc) {
+ perror("mprotect partial over missing succeeded");
+ return 1;
+ }
+
+ //cleanup
+ munmap(map1, 6 * PAGE_SIZE);
+
+ outln("PASS");
+ return 0;
+}