1 files changed, 58 insertions, 0 deletions
diff --git a/runtime/base/safe_copy_test.cc b/runtime/base/safe_copy_test.cc
new file mode 100644
index 0000000000..d5b8cdb05d
--- /dev/null
+++ b/runtime/base/safe_copy_test.cc
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "safe_copy.h"
+
+#include "common_runtime_test.h"
+
+#include <sys/mman.h>
+#include <sys/user.h>
+
+namespace art {
+
+#if defined(__linux__)
+
+TEST(SafeCopyTest, smoke) {
+  // Map two pages, and mark the second one as PROT_NONE.
+  void* map = mmap(nullptr, PAGE_SIZE * 2, PROT_READ | PROT_WRITE,
+                   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  ASSERT_NE(MAP_FAILED, map);
+  char* page1 = static_cast<char*>(map);
+  ASSERT_EQ(0, mprotect(page1 + PAGE_SIZE, PAGE_SIZE, PROT_NONE));
+
+  page1[0] = 'a';
+  page1[PAGE_SIZE - 1] = 'z';
+
+  char buf[PAGE_SIZE];
+
+  // Completely valid read.
+  memset(buf, 0xCC, sizeof(buf));
+  EXPECT_EQ(static_cast<ssize_t>(PAGE_SIZE), SafeCopy(buf, page1, PAGE_SIZE));
+  EXPECT_EQ(0, memcmp(buf, page1, PAGE_SIZE));
+
+  // Reading off of the end.
+  memset(buf, 0xCC, sizeof(buf));
+  EXPECT_EQ(static_cast<ssize_t>(PAGE_SIZE - 1), SafeCopy(buf, page1 + 1, PAGE_SIZE));
+  EXPECT_EQ(0, memcmp(buf, page1 + 1, PAGE_SIZE - 1));
+
+  // Completely invalid.
+  EXPECT_EQ(0, SafeCopy(buf, page1 + PAGE_SIZE, PAGE_SIZE));
+  ASSERT_EQ(0, munmap(map, PAGE_SIZE * 2));
+}
+
+#endif  // defined(__linux__)
+
+}  // namespace art