Merge changes If7b13672,I96135a8c (4f152a5f) · Commits · e / os / android_system_core

libcutils/tests/AshmemTest.cpp

+78 −4

Original line number	Diff line number	Diff line
		@@ -14,10 +14,11 @@
		* limitations under the License.
		*/

		#include <sys/mman.h>
		#include <android-base/unique_fd.h>
		#include <cutils/ashmem.h>
		#include <gtest/gtest.h>
		#include <android-base/unique_fd.h>
		#include <linux/fs.h>
		#include <sys/mman.h>

		using android::base::unique_fd;

		@@ -29,8 +30,8 @@ void TestCreateRegion(size_t size, unique_fd &fd, int prot) {
		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);
		void TestMmap(const unique_fd& fd, size_t size, int prot, void** region, off_t off = 0) {
		*region = mmap(nullptr, size, prot, MAP_SHARED, fd, off);
		ASSERT_NE(MAP_FAILED, *region);
		}

		@@ -38,6 +39,10 @@ void TestProtDenied(const unique_fd &fd, size_t size, int prot) {
		EXPECT_EQ(MAP_FAILED, mmap(nullptr, size, prot, MAP_SHARED, fd, 0));
		}

		void TestProtIs(const unique_fd& fd, int prot) {
		EXPECT_EQ(prot, ioctl(fd, ASHMEM_GET_PROT_MASK));
		}

		void FillData(uint8_t* data, size_t dataLen) {
		for (size_t i = 0; i < dataLen; i++) {
		data[i] = i & 0xFF;
		@@ -101,6 +106,63 @@ TEST(AshmemTest, ForkTest) {
		EXPECT_EQ(0, munmap(region2, size));
		}

		TEST(AshmemTest, FileOperationsTest) {
		unique_fd fd;
		void* region;

		// Allocate a 4-page buffer, but leave page-sized holes on either side
		constexpr size_t size = PAGE_SIZE * 4;
		constexpr size_t dataSize = PAGE_SIZE * 2;
		constexpr size_t holeSize = PAGE_SIZE;
		ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ \| PROT_WRITE));
		ASSERT_NO_FATAL_FAILURE(TestMmap(fd, dataSize, PROT_READ \| PROT_WRITE, &region, holeSize));

		uint8_t data[dataSize];
		FillData(data, dataSize);
		memcpy(region, data, dataSize);

		constexpr off_t dataStart = holeSize;
		constexpr off_t dataEnd = dataStart + dataSize;

		// The sequence of seeks below looks something like this:
		//
		// [ ][data][data][ ]
		// --^ lseek(99, SEEK_SET)
		// ------^ lseek(dataStart, SEEK_CUR)
		// ------^ lseek(0, SEEK_DATA)
		// ------------^ lseek(dataStart, SEEK_HOLE)
		// ^-- lseek(-99, SEEK_END)
		// ^------ lseek(-dataStart, SEEK_CUR)
		const struct {
		// lseek() parameters
		off_t offset;
		int whence;
		// Expected lseek() return value
		off_t ret;
		} seeks[] = {
		{99, SEEK_SET, 99}, {dataStart, SEEK_CUR, dataStart + 99},
		{0, SEEK_DATA, dataStart}, {dataStart, SEEK_HOLE, dataEnd},
		{-99, SEEK_END, size - 99}, {-dataStart, SEEK_CUR, dataEnd - 99},
		};
		for (const auto& cfg : seeks) {
		errno = 0;
		auto off = lseek(fd, cfg.offset, cfg.whence);
		ASSERT_EQ(cfg.ret, off) << "lseek(" << cfg.offset << ", " << cfg.whence << ") failed"
		<< (errno ? ": " : "") << (errno ? strerror(errno) : "");

		if (off >= dataStart && off < dataEnd) {
		off_t dataOff = off - dataStart;
		ssize_t readSize = dataSize - dataOff;
		uint8_t buf[readSize];

		ASSERT_EQ(readSize, TEMP_FAILURE_RETRY(read(fd, buf, readSize)));
		EXPECT_EQ(0, memcmp(buf, data + dataOff, readSize));
		}
		}

		EXPECT_EQ(0, munmap(region, dataSize));
		}

		TEST(AshmemTest, ProtTest) {
		unique_fd fd;
		constexpr size_t size = PAGE_SIZE;
		@@ -108,13 +170,25 @@ TEST(AshmemTest, ProtTest) {

		ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ));
		TestProtDenied(fd, size, PROT_WRITE);
		TestProtIs(fd, PROT_READ);
		ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ, &region));
		EXPECT_EQ(0, munmap(region, size));

		ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_WRITE));
		TestProtDenied(fd, size, PROT_READ);
		TestProtIs(fd, PROT_WRITE);
		ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_WRITE, &region));
		EXPECT_EQ(0, munmap(region, size));

		ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ \| PROT_WRITE));
		TestProtIs(fd, PROT_READ \| PROT_WRITE);
		ASSERT_EQ(0, ashmem_set_prot_region(fd, PROT_READ));
		errno = 0;
		ASSERT_EQ(-1, ashmem_set_prot_region(fd, PROT_READ \| PROT_WRITE))
		<< "kernel shouldn't allow adding protection bits";
		EXPECT_EQ(EINVAL, errno);
		TestProtIs(fd, PROT_READ);
		TestProtDenied(fd, size, PROT_WRITE);
		}

		TEST(AshmemTest, ForkProtTest) {