1 files changed, 167 insertions, 0 deletions
diff --git a/test/syscalls/linux/pread64.cc b/test/syscalls/linux/pread64.cc
new file mode 100644
index 000000000..bcdbbb044
--- /dev/null
+++ b/test/syscalls/linux/pread64.cc
@@ -0,0 +1,167 @@
+// Copyright 2018 The gVisor Authors.
+//
+// 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 <errno.h>
+#include <fcntl.h>
+#include <linux/unistd.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+#include "test/util/file_descriptor.h"
+#include "test/util/temp_path.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+class Pread64Test : public ::testing::Test {
+  void SetUp() override {
+    name_ = NewTempAbsPath();
+    ASSERT_NO_ERRNO_AND_VALUE(Open(name_, O_CREAT, 0644));
+  }
+
+  void TearDown() override { unlink(name_.c_str()); }
+
+ public:
+  std::string name_;
+};
+
+TEST(Pread64TestNoTempFile, BadFileDescriptor) {
+  char buf[1024];
+  EXPECT_THAT(pread64(-1, buf, 1024, 0), SyscallFailsWithErrno(EBADF));
+}
+
+TEST_F(Pread64Test, ZeroBuffer) {
+  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(name_, O_RDWR));
+
+  char msg[] = "hello world";
+  EXPECT_THAT(pwrite64(fd.get(), msg, strlen(msg), 0),
+              SyscallSucceedsWithValue(strlen(msg)));
+
+  char buf[10];
+  EXPECT_THAT(pread64(fd.get(), buf, 0, 0), SyscallSucceedsWithValue(0));
+}
+
+TEST_F(Pread64Test, BadBuffer) {
+  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(name_, O_RDWR));
+
+  char msg[] = "hello world";
+  EXPECT_THAT(pwrite64(fd.get(), msg, strlen(msg), 0),
+              SyscallSucceedsWithValue(strlen(msg)));
+
+  char* bad_buffer = nullptr;
+  EXPECT_THAT(pread64(fd.get(), bad_buffer, 1024, 0),
+              SyscallFailsWithErrno(EFAULT));
+}
+
+TEST_F(Pread64Test, WriteOnlyNotReadable) {
+  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(name_, O_WRONLY));
+
+  char buf[1024];
+  EXPECT_THAT(pread64(fd.get(), buf, 1024, 0), SyscallFailsWithErrno(EBADF));
+}
+
+TEST_F(Pread64Test, DirNotReadable) {
+  const FileDescriptor fd =
+      ASSERT_NO_ERRNO_AND_VALUE(Open(GetAbsoluteTestTmpdir(), O_RDONLY));
+
+  char buf[1024];
+  EXPECT_THAT(pread64(fd.get(), buf, 1024, 0), SyscallFailsWithErrno(EISDIR));
+}
+
+TEST_F(Pread64Test, BadOffset) {
+  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(name_, O_RDONLY));
+
+  char buf[1024];
+  EXPECT_THAT(pread64(fd.get(), buf, 1024, -1), SyscallFailsWithErrno(EINVAL));
+}
+
+TEST_F(Pread64Test, OffsetNotIncremented) {
+  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(name_, O_RDWR));
+
+  char msg[] = "hello world";
+  EXPECT_THAT(write(fd.get(), msg, strlen(msg)),
+              SyscallSucceedsWithValue(strlen(msg)));
+  int offset;
+  EXPECT_THAT(offset = lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
+
+  char buf1[1024];
+  EXPECT_THAT(pread64(fd.get(), buf1, 1024, 0),
+              SyscallSucceedsWithValue(strlen(msg)));
+  EXPECT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(offset));
+
+  char buf2[1024];
+  EXPECT_THAT(pread64(fd.get(), buf2, 1024, 3),
+              SyscallSucceedsWithValue(strlen(msg) - 3));
+  EXPECT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(offset));
+}
+
+TEST_F(Pread64Test, EndOfFile) {
+  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(name_, O_RDONLY));
+
+  char buf[1024];
+  EXPECT_THAT(pread64(fd.get(), buf, 1024, 0), SyscallSucceedsWithValue(0));
+}
+
+int memfd_create(const std::string& name, unsigned int flags) {
+  return syscall(__NR_memfd_create, name.c_str(), flags);
+}
+
+TEST_F(Pread64Test, Overflow) {
+  int f = memfd_create("negative", 0);
+  const FileDescriptor fd(f);
+
+  EXPECT_THAT(ftruncate(fd.get(), 0x7fffffffffffffffull), SyscallSucceeds());
+
+  char buf[10];
+  EXPECT_THAT(pread64(fd.get(), buf, sizeof(buf), 0x7fffffffffffffffull),
+              SyscallFailsWithErrno(EINVAL));
+}
+
+TEST(Pread64TestNoTempFile, CantReadSocketPair_NoRandomSave) {
+  int sock_fds[2];
+  EXPECT_THAT(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds), SyscallSucceeds());
+
+  char buf[1024];
+  EXPECT_THAT(pread64(sock_fds[0], buf, 1024, 0),
+              SyscallFailsWithErrno(ESPIPE));
+  EXPECT_THAT(pread64(sock_fds[1], buf, 1024, 0),
+              SyscallFailsWithErrno(ESPIPE));
+
+  EXPECT_THAT(close(sock_fds[0]), SyscallSucceeds());
+  EXPECT_THAT(close(sock_fds[1]), SyscallSucceeds());
+}
+
+TEST(Pread64TestNoTempFile, CantReadPipe) {
+  char buf[1024];
+
+  int pipe_fds[2];
+  EXPECT_THAT(pipe(pipe_fds), SyscallSucceeds());
+
+  EXPECT_THAT(pread64(pipe_fds[0], buf, 1024, 0),
+              SyscallFailsWithErrno(ESPIPE));
+
+  EXPECT_THAT(close(pipe_fds[0]), SyscallSucceeds());
+  EXPECT_THAT(close(pipe_fds[1]), SyscallSucceeds());
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor