--- /dev/null
+/*
+ * Copyright (C) 2015 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 <gtest/gtest.h>
+
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <unistd.h>
+#include "private/bionic_prctl.h"
+
+// http://b/20017123.
+TEST(sys_prctl, bug_20017123) {
+#if defined(__ANDROID__)
+ size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));
+ void* p = mmap(NULL, page_size * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ ASSERT_NE(MAP_FAILED, p);
+ ASSERT_EQ(0, mprotect(p, page_size, PROT_NONE));
+ ASSERT_NE(-1, prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, p, page_size * 3, "anonymous map space"));
+ volatile char* vp = reinterpret_cast<volatile char*>(p);
+ // Below memory access causes SEGV if the memory map is screwed up.
+ *(vp + page_size) = 0;
+ ASSERT_EQ(0, munmap(p, page_size * 3));
+#else
+ GTEST_LOG_(INFO) << "This test does nothing as it tests an Android specific kernel feature.";
+#endif
+}