| /* |
| * Copyright (C) 2016 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 <sys/mman.h> |
| #include <cutils/ashmem.h> |
| #include <gtest/gtest.h> |
| #include <android-base/unique_fd.h> |
| |
| using android::base::unique_fd; |
| |
| void TestCreateRegion(size_t size, unique_fd &fd, int prot) { |
| fd = unique_fd(ashmem_create_region(nullptr, size)); |
| ASSERT_TRUE(fd >= 0); |
| ASSERT_TRUE(ashmem_valid(fd)); |
| ASSERT_EQ(size, static_cast<size_t>(ashmem_get_size_region(fd))); |
| ASSERT_EQ(0, ashmem_set_prot_region(fd, prot)); |
| } |
| |
| void TestMmap(const unique_fd &fd, size_t size, int prot, void **region) { |
| *region = mmap(nullptr, size, prot, MAP_SHARED, fd, 0); |
| ASSERT_NE(MAP_FAILED, *region); |
| } |
| |
| void TestProtDenied(const unique_fd &fd, size_t size, int prot) { |
| EXPECT_EQ(MAP_FAILED, mmap(nullptr, size, prot, MAP_SHARED, fd, 0)); |
| } |
| |
| void FillData(uint8_t* data, size_t dataLen) { |
| for (size_t i = 0; i < dataLen; i++) { |
| data[i] = i & 0xFF; |
| } |
| } |
| |
| TEST(AshmemTest, BasicTest) { |
| constexpr size_t size = PAGE_SIZE; |
| uint8_t data[size]; |
| FillData(data, size); |
| |
| unique_fd fd; |
| ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE)); |
| |
| void *region1; |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, ®ion1)); |
| |
| memcpy(region1, &data, size); |
| ASSERT_EQ(0, memcmp(region1, &data, size)); |
| |
| EXPECT_EQ(0, munmap(region1, size)); |
| |
| void *region2; |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ, ®ion2)); |
| ASSERT_EQ(0, memcmp(region2, &data, size)); |
| EXPECT_EQ(0, munmap(region2, size)); |
| } |
| |
| TEST(AshmemTest, ForkTest) { |
| constexpr size_t size = PAGE_SIZE; |
| uint8_t data[size]; |
| FillData(data, size); |
| |
| unique_fd fd; |
| ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE)); |
| |
| void *region1; |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, ®ion1)); |
| |
| memcpy(region1, &data, size); |
| ASSERT_EQ(0, memcmp(region1, &data, size)); |
| EXPECT_EQ(0, munmap(region1, size)); |
| |
| ASSERT_EXIT({ |
| void *region2 = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
| if (region2 == MAP_FAILED) { |
| _exit(1); |
| } |
| if (memcmp(region2, &data, size) != 0) { |
| _exit(2); |
| } |
| memset(region2, 0, size); |
| munmap(region2, size); |
| _exit(0); |
| }, ::testing::ExitedWithCode(0),""); |
| |
| memset(&data, 0, size); |
| void *region2; |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, ®ion2)); |
| ASSERT_EQ(0, memcmp(region2, &data, size)); |
| EXPECT_EQ(0, munmap(region2, size)); |
| } |
| |
| TEST(AshmemTest, ProtTest) { |
| unique_fd fd; |
| constexpr size_t size = PAGE_SIZE; |
| void *region; |
| |
| ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ)); |
| TestProtDenied(fd, size, PROT_WRITE); |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ, ®ion)); |
| EXPECT_EQ(0, munmap(region, size)); |
| |
| ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_WRITE)); |
| TestProtDenied(fd, size, PROT_READ); |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_WRITE, ®ion)); |
| EXPECT_EQ(0, munmap(region, size)); |
| } |
| |
| TEST(AshmemTest, ForkProtTest) { |
| unique_fd fd; |
| constexpr size_t size = PAGE_SIZE; |
| |
| int protFlags[] = { PROT_READ, PROT_WRITE }; |
| for (int i = 0; i < 2; i++) { |
| ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE)); |
| ASSERT_EXIT({ |
| if (ashmem_set_prot_region(fd, protFlags[i]) >= 0) { |
| _exit(0); |
| } else { |
| _exit(1); |
| } |
| }, ::testing::ExitedWithCode(0), ""); |
| ASSERT_NO_FATAL_FAILURE(TestProtDenied(fd, size, protFlags[1-i])); |
| } |
| } |
| |
| TEST(AshmemTest, ForkMultiRegionTest) { |
| constexpr size_t size = PAGE_SIZE; |
| uint8_t data[size]; |
| FillData(data, size); |
| |
| constexpr int nRegions = 16; |
| unique_fd fd[nRegions]; |
| for (int i = 0; i < nRegions; i++) { |
| ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd[i], PROT_READ | PROT_WRITE)); |
| void *region; |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd[i], size, PROT_READ | PROT_WRITE, ®ion)); |
| memcpy(region, &data, size); |
| ASSERT_EQ(0, memcmp(region, &data, size)); |
| EXPECT_EQ(0, munmap(region, size)); |
| } |
| |
| ASSERT_EXIT({ |
| for (int i = 0; i < nRegions; i++) { |
| void *region = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd[i], 0); |
| if (region == MAP_FAILED) { |
| _exit(1); |
| } |
| if (memcmp(region, &data, size) != 0) { |
| munmap(region, size); |
| _exit(2); |
| } |
| memset(region, 0, size); |
| munmap(region, size); |
| } |
| _exit(0); |
| }, ::testing::ExitedWithCode(0), ""); |
| |
| memset(&data, 0, size); |
| for (int i = 0; i < nRegions; i++) { |
| void *region; |
| ASSERT_NO_FATAL_FAILURE(TestMmap(fd[i], size, PROT_READ | PROT_WRITE, ®ion)); |
| ASSERT_EQ(0, memcmp(region, &data, size)); |
| EXPECT_EQ(0, munmap(region, size)); |
| } |
| } |