1 files changed, 77 insertions, 0 deletions
diff --git a/test/syscalls/linux/fchdir.cc b/test/syscalls/linux/fchdir.cc
new file mode 100644
index 000000000..08bcae1e8
--- /dev/null
+++ b/test/syscalls/linux/fchdir.cc
@@ -0,0 +1,77 @@
+// 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 <fcntl.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+
+#include "gtest/gtest.h"
+#include "test/util/capability_util.h"
+#include "test/util/temp_path.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+TEST(FchdirTest, Success) {
+  auto temp_dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
+  int fd;
+  ASSERT_THAT(fd = open(temp_dir.path().c_str(), O_DIRECTORY | O_RDONLY),
+              SyscallSucceeds());
+
+  EXPECT_THAT(fchdir(fd), SyscallSucceeds());
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+  // Change CWD to a permanent location as temp dirs will be cleaned up.
+  EXPECT_THAT(chdir("/"), SyscallSucceeds());
+}
+
+TEST(FchdirTest, InvalidFD) {
+  EXPECT_THAT(fchdir(-1), SyscallFailsWithErrno(EBADF));
+}
+
+TEST(FchdirTest, PermissionDenied) {
+  // Drop capabilities that allow us to override directory permissions.
+  ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false));
+  ASSERT_NO_ERRNO(SetCapability(CAP_DAC_READ_SEARCH, false));
+
+  auto temp_dir = ASSERT_NO_ERRNO_AND_VALUE(
+      TempPath::CreateDirWith(GetAbsoluteTestTmpdir(), 0666 /* mode */));
+
+  int fd;
+  ASSERT_THAT(fd = open(temp_dir.path().c_str(), O_DIRECTORY | O_RDONLY),
+              SyscallSucceeds());
+
+  EXPECT_THAT(fchdir(fd), SyscallFailsWithErrno(EACCES));
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+}
+
+TEST(FchdirTest, NotDir) {
+  auto temp_file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
+
+  int fd;
+  ASSERT_THAT(fd = open(temp_file.path().c_str(), O_CREAT | O_RDONLY, 0777),
+              SyscallSucceeds());
+
+  EXPECT_THAT(fchdir(fd), SyscallFailsWithErrno(ENOTDIR));
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor