| /* |
| * 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 <inttypes.h> |
| #include <stdio.h> |
| #include <sys/mman.h> |
| #include <sys/prctl.h> |
| #include <unistd.h> |
| |
| #include <string> |
| #include <vector> |
| |
| #include <gtest/gtest.h> |
| |
| #include "android-base/file.h" |
| #include "android-base/strings.h" |
| #include "private/bionic_prctl.h" |
| |
| // http://b/20017123. |
| TEST(sys_prctl, bug_20017123) { |
| #if defined(__ANDROID__) // PR_SET_VMA is only available in Android kernels. |
| 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")); |
| // Now read the maps and verify that there are no overlapped maps. |
| std::string file_data; |
| ASSERT_TRUE(android::base::ReadFileToString("/proc/self/maps", &file_data)); |
| |
| uintptr_t last_start = 0; |
| uintptr_t last_end = 0; |
| std::vector<std::string> lines = android::base::Split(file_data, "\n"); |
| for (size_t i = 0; i < lines.size(); i++) { |
| if (lines[i].empty()) { |
| continue; |
| } |
| uintptr_t start; |
| uintptr_t end; |
| ASSERT_EQ(2, sscanf(lines[i].c_str(), "%" SCNxPTR "-%" SCNxPTR " ", &start, &end)) |
| << "Failed to parse line: " << lines[i]; |
| // This will never fail on the first line, so no need to do any special checking. |
| ASSERT_GE(start, last_end) << "Overlapping map detected:\n" << lines[i -1] << lines[i]; |
| last_start = start; |
| last_end = end; |
| } |
| |
| 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 |
| } |