1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <gtest/gtest.h>
18
19 #include <sys/mman.h>
20 #include <sys/prctl.h>
21 #include <unistd.h>
22 #include "private/bionic_prctl.h"
23
24 // http://b/20017123.
TEST(sys_prctl,bug_20017123)25 TEST(sys_prctl, bug_20017123) {
26 #if defined(__ANDROID__)
27 size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));
28 void* p = mmap(NULL, page_size * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
29 ASSERT_NE(MAP_FAILED, p);
30 ASSERT_EQ(0, mprotect(p, page_size, PROT_NONE));
31 ASSERT_NE(-1, prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, p, page_size * 3, "anonymous map space"));
32 volatile char* vp = reinterpret_cast<volatile char*>(p);
33 // Below memory access causes SEGV if the memory map is screwed up.
34 *(vp + page_size) = 0;
35 ASSERT_EQ(0, munmap(p, page_size * 3));
36 #else
37 GTEST_LOG_(INFO) << "This test does nothing as it tests an Android specific kernel feature.";
38 #endif
39 }
40