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AshmemTest: test lseek() and read() on ashmem fds 

ashmem has in-kernel handlers for lseek() and read(), but they aren't
currently being tested.

Add tests for various seeks on a buffer containing holes.  If we land
inside data, then check that we read() the expected data at that offset.

Test:  /data/nativetest64/libcutils_test/libcutils_test64 \
       --gtest_filter=AshmemTest.* (on hikey)
Test:  /data/nativetest/libcutils_test/libcutils_test32 \
       --gtest_filter=AshmemTest.* (on hikey)

Bug: 37254818
Change-Id: I96135a8cea2ce99932e3bc97b5254c95ef6b264a
Signed-off-by: Greg Hackmann <ghackmann@google.com>
This commit is contained in:
Greg Hackmann 2017-04-05 10:03:10 -07:00
parent 1dcd257a21
commit be11d570ec
1 changed files with 62 additions and 4 deletions
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66
libcutils/tests/AshmemTest.cpp
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@ -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);
}
@ -101,6 +102,63 @@ 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;