Connor O'Brien | a963ae8 | 2016-09-12 15:52:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | |
Greg Hackmann | be11d57 | 2017-04-05 10:03:10 -0700 | [diff] [blame^] | 17 | #include <android-base/unique_fd.h> |
Connor O'Brien | a963ae8 | 2016-09-12 15:52:04 -0700 | [diff] [blame] | 18 | #include <cutils/ashmem.h> |
| 19 | #include <gtest/gtest.h> |
Greg Hackmann | be11d57 | 2017-04-05 10:03:10 -0700 | [diff] [blame^] | 20 | #include <linux/fs.h> |
| 21 | #include <sys/mman.h> |
Connor O'Brien | a963ae8 | 2016-09-12 15:52:04 -0700 | [diff] [blame] | 22 | |
| 23 | using android::base::unique_fd; |
| 24 | |
| 25 | void TestCreateRegion(size_t size, unique_fd &fd, int prot) { |
| 26 | fd = unique_fd(ashmem_create_region(nullptr, size)); |
| 27 | ASSERT_TRUE(fd >= 0); |
| 28 | ASSERT_TRUE(ashmem_valid(fd)); |
| 29 | ASSERT_EQ(size, static_cast<size_t>(ashmem_get_size_region(fd))); |
| 30 | ASSERT_EQ(0, ashmem_set_prot_region(fd, prot)); |
| 31 | } |
| 32 | |
Greg Hackmann | be11d57 | 2017-04-05 10:03:10 -0700 | [diff] [blame^] | 33 | void TestMmap(const unique_fd& fd, size_t size, int prot, void** region, off_t off = 0) { |
| 34 | *region = mmap(nullptr, size, prot, MAP_SHARED, fd, off); |
Connor O'Brien | a963ae8 | 2016-09-12 15:52:04 -0700 | [diff] [blame] | 35 | ASSERT_NE(MAP_FAILED, *region); |
| 36 | } |
| 37 | |
| 38 | void TestProtDenied(const unique_fd &fd, size_t size, int prot) { |
| 39 | EXPECT_EQ(MAP_FAILED, mmap(nullptr, size, prot, MAP_SHARED, fd, 0)); |
| 40 | } |
| 41 | |
| 42 | void FillData(uint8_t* data, size_t dataLen) { |
| 43 | for (size_t i = 0; i < dataLen; i++) { |
| 44 | data[i] = i & 0xFF; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | TEST(AshmemTest, BasicTest) { |
| 49 | constexpr size_t size = PAGE_SIZE; |
| 50 | uint8_t data[size]; |
| 51 | FillData(data, size); |
| 52 | |
| 53 | unique_fd fd; |
| 54 | ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE)); |
| 55 | |
| 56 | void *region1; |
| 57 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, ®ion1)); |
| 58 | |
| 59 | memcpy(region1, &data, size); |
| 60 | ASSERT_EQ(0, memcmp(region1, &data, size)); |
| 61 | |
| 62 | EXPECT_EQ(0, munmap(region1, size)); |
| 63 | |
| 64 | void *region2; |
| 65 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ, ®ion2)); |
| 66 | ASSERT_EQ(0, memcmp(region2, &data, size)); |
| 67 | EXPECT_EQ(0, munmap(region2, size)); |
| 68 | } |
| 69 | |
| 70 | TEST(AshmemTest, ForkTest) { |
| 71 | constexpr size_t size = PAGE_SIZE; |
| 72 | uint8_t data[size]; |
| 73 | FillData(data, size); |
| 74 | |
| 75 | unique_fd fd; |
| 76 | ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE)); |
| 77 | |
| 78 | void *region1; |
| 79 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, ®ion1)); |
| 80 | |
| 81 | memcpy(region1, &data, size); |
| 82 | ASSERT_EQ(0, memcmp(region1, &data, size)); |
| 83 | EXPECT_EQ(0, munmap(region1, size)); |
| 84 | |
| 85 | ASSERT_EXIT({ |
| 86 | void *region2 = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
| 87 | if (region2 == MAP_FAILED) { |
| 88 | _exit(1); |
| 89 | } |
| 90 | if (memcmp(region2, &data, size) != 0) { |
| 91 | _exit(2); |
| 92 | } |
| 93 | memset(region2, 0, size); |
| 94 | munmap(region2, size); |
| 95 | _exit(0); |
| 96 | }, ::testing::ExitedWithCode(0),""); |
| 97 | |
| 98 | memset(&data, 0, size); |
| 99 | void *region2; |
| 100 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, ®ion2)); |
| 101 | ASSERT_EQ(0, memcmp(region2, &data, size)); |
| 102 | EXPECT_EQ(0, munmap(region2, size)); |
| 103 | } |
| 104 | |
Greg Hackmann | be11d57 | 2017-04-05 10:03:10 -0700 | [diff] [blame^] | 105 | TEST(AshmemTest, FileOperationsTest) { |
| 106 | unique_fd fd; |
| 107 | void* region; |
| 108 | |
| 109 | // Allocate a 4-page buffer, but leave page-sized holes on either side |
| 110 | constexpr size_t size = PAGE_SIZE * 4; |
| 111 | constexpr size_t dataSize = PAGE_SIZE * 2; |
| 112 | constexpr size_t holeSize = PAGE_SIZE; |
| 113 | ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE)); |
| 114 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd, dataSize, PROT_READ | PROT_WRITE, ®ion, holeSize)); |
| 115 | |
| 116 | uint8_t data[dataSize]; |
| 117 | FillData(data, dataSize); |
| 118 | memcpy(region, data, dataSize); |
| 119 | |
| 120 | constexpr off_t dataStart = holeSize; |
| 121 | constexpr off_t dataEnd = dataStart + dataSize; |
| 122 | |
| 123 | // The sequence of seeks below looks something like this: |
| 124 | // |
| 125 | // [ ][data][data][ ] |
| 126 | // --^ lseek(99, SEEK_SET) |
| 127 | // ------^ lseek(dataStart, SEEK_CUR) |
| 128 | // ------^ lseek(0, SEEK_DATA) |
| 129 | // ------------^ lseek(dataStart, SEEK_HOLE) |
| 130 | // ^-- lseek(-99, SEEK_END) |
| 131 | // ^------ lseek(-dataStart, SEEK_CUR) |
| 132 | const struct { |
| 133 | // lseek() parameters |
| 134 | off_t offset; |
| 135 | int whence; |
| 136 | // Expected lseek() return value |
| 137 | off_t ret; |
| 138 | } seeks[] = { |
| 139 | {99, SEEK_SET, 99}, {dataStart, SEEK_CUR, dataStart + 99}, |
| 140 | {0, SEEK_DATA, dataStart}, {dataStart, SEEK_HOLE, dataEnd}, |
| 141 | {-99, SEEK_END, size - 99}, {-dataStart, SEEK_CUR, dataEnd - 99}, |
| 142 | }; |
| 143 | for (const auto& cfg : seeks) { |
| 144 | errno = 0; |
| 145 | auto off = lseek(fd, cfg.offset, cfg.whence); |
| 146 | ASSERT_EQ(cfg.ret, off) << "lseek(" << cfg.offset << ", " << cfg.whence << ") failed" |
| 147 | << (errno ? ": " : "") << (errno ? strerror(errno) : ""); |
| 148 | |
| 149 | if (off >= dataStart && off < dataEnd) { |
| 150 | off_t dataOff = off - dataStart; |
| 151 | ssize_t readSize = dataSize - dataOff; |
| 152 | uint8_t buf[readSize]; |
| 153 | |
| 154 | ASSERT_EQ(readSize, TEMP_FAILURE_RETRY(read(fd, buf, readSize))); |
| 155 | EXPECT_EQ(0, memcmp(buf, data + dataOff, readSize)); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | EXPECT_EQ(0, munmap(region, dataSize)); |
| 160 | } |
| 161 | |
Connor O'Brien | a963ae8 | 2016-09-12 15:52:04 -0700 | [diff] [blame] | 162 | TEST(AshmemTest, ProtTest) { |
| 163 | unique_fd fd; |
| 164 | constexpr size_t size = PAGE_SIZE; |
| 165 | void *region; |
| 166 | |
| 167 | ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ)); |
| 168 | TestProtDenied(fd, size, PROT_WRITE); |
| 169 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ, ®ion)); |
| 170 | EXPECT_EQ(0, munmap(region, size)); |
| 171 | |
| 172 | ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_WRITE)); |
| 173 | TestProtDenied(fd, size, PROT_READ); |
| 174 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_WRITE, ®ion)); |
| 175 | EXPECT_EQ(0, munmap(region, size)); |
| 176 | } |
| 177 | |
| 178 | TEST(AshmemTest, ForkProtTest) { |
| 179 | unique_fd fd; |
| 180 | constexpr size_t size = PAGE_SIZE; |
| 181 | |
| 182 | int protFlags[] = { PROT_READ, PROT_WRITE }; |
| 183 | for (int i = 0; i < 2; i++) { |
| 184 | ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE)); |
| 185 | ASSERT_EXIT({ |
| 186 | if (ashmem_set_prot_region(fd, protFlags[i]) >= 0) { |
| 187 | _exit(0); |
| 188 | } else { |
| 189 | _exit(1); |
| 190 | } |
| 191 | }, ::testing::ExitedWithCode(0), ""); |
| 192 | ASSERT_NO_FATAL_FAILURE(TestProtDenied(fd, size, protFlags[1-i])); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | TEST(AshmemTest, ForkMultiRegionTest) { |
| 197 | constexpr size_t size = PAGE_SIZE; |
| 198 | uint8_t data[size]; |
| 199 | FillData(data, size); |
| 200 | |
| 201 | constexpr int nRegions = 16; |
| 202 | unique_fd fd[nRegions]; |
| 203 | for (int i = 0; i < nRegions; i++) { |
| 204 | ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd[i], PROT_READ | PROT_WRITE)); |
| 205 | void *region; |
| 206 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd[i], size, PROT_READ | PROT_WRITE, ®ion)); |
| 207 | memcpy(region, &data, size); |
| 208 | ASSERT_EQ(0, memcmp(region, &data, size)); |
| 209 | EXPECT_EQ(0, munmap(region, size)); |
| 210 | } |
| 211 | |
| 212 | ASSERT_EXIT({ |
| 213 | for (int i = 0; i < nRegions; i++) { |
| 214 | void *region = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd[i], 0); |
| 215 | if (region == MAP_FAILED) { |
| 216 | _exit(1); |
| 217 | } |
| 218 | if (memcmp(region, &data, size) != 0) { |
| 219 | munmap(region, size); |
| 220 | _exit(2); |
| 221 | } |
| 222 | memset(region, 0, size); |
| 223 | munmap(region, size); |
| 224 | } |
| 225 | _exit(0); |
| 226 | }, ::testing::ExitedWithCode(0), ""); |
| 227 | |
| 228 | memset(&data, 0, size); |
| 229 | for (int i = 0; i < nRegions; i++) { |
| 230 | void *region; |
| 231 | ASSERT_NO_FATAL_FAILURE(TestMmap(fd[i], size, PROT_READ | PROT_WRITE, ®ion)); |
| 232 | ASSERT_EQ(0, memcmp(region, &data, size)); |
| 233 | EXPECT_EQ(0, munmap(region, size)); |
| 234 | } |
| 235 | } |