bionic/tests/sys_prctl_test.cpp

40 lines
1.4 KiB
C++
Raw Permalink Normal View History

/*
* 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
}