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Diffstat (limited to 'test/syscalls/linux/rename.cc')
| -rw-r--r-- | test/syscalls/linux/rename.cc | 444 |
1 files changed, 0 insertions, 444 deletions
diff --git a/test/syscalls/linux/rename.cc b/test/syscalls/linux/rename.cc deleted file mode 100644 index 76a8da65f..000000000 --- a/test/syscalls/linux/rename.cc +++ /dev/null @@ -1,444 +0,0 @@ -// 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 <stdio.h> - -#include <string> - -#include "gtest/gtest.h" -#include "absl/strings/string_view.h" -#include "test/util/capability_util.h" -#include "test/util/cleanup.h" -#include "test/util/file_descriptor.h" -#include "test/util/fs_util.h" -#include "test/util/temp_path.h" -#include "test/util/test_util.h" - -namespace gvisor { -namespace testing { - -namespace { - -TEST(RenameTest, RootToAnything) { - ASSERT_THAT(rename("/", "/bin"), SyscallFailsWithErrno(EBUSY)); -} - -TEST(RenameTest, AnythingToRoot) { - ASSERT_THAT(rename("/bin", "/"), SyscallFailsWithErrno(EBUSY)); -} - -TEST(RenameTest, SourceIsAncestorOfTarget) { - auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto subdir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir.path())); - ASSERT_THAT(rename(dir.path().c_str(), subdir.path().c_str()), - SyscallFailsWithErrno(EINVAL)); - - // Try an even deeper directory. - auto deep_subdir = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(subdir.path())); - ASSERT_THAT(rename(dir.path().c_str(), deep_subdir.path().c_str()), - SyscallFailsWithErrno(EINVAL)); -} - -TEST(RenameTest, TargetIsAncestorOfSource) { - auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto subdir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir.path())); - ASSERT_THAT(rename(subdir.path().c_str(), dir.path().c_str()), - SyscallFailsWithErrno(ENOTEMPTY)); - - // Try an even deeper directory. - auto deep_subdir = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(subdir.path())); - ASSERT_THAT(rename(deep_subdir.path().c_str(), dir.path().c_str()), - SyscallFailsWithErrno(ENOTEMPTY)); -} - -TEST(RenameTest, FileToSelf) { - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); - EXPECT_THAT(rename(f.path().c_str(), f.path().c_str()), SyscallSucceeds()); -} - -TEST(RenameTest, DirectoryToSelf) { - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - EXPECT_THAT(rename(f.path().c_str(), f.path().c_str()), SyscallSucceeds()); -} - -TEST(RenameTest, FileToSameDirectory) { - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); - std::string const newpath = NewTempAbsPath(); - ASSERT_THAT(rename(f.path().c_str(), newpath.c_str()), SyscallSucceeds()); - std::string const oldpath = f.release(); - f.reset(newpath); - EXPECT_THAT(Exists(oldpath), IsPosixErrorOkAndHolds(false)); - EXPECT_THAT(Exists(newpath), IsPosixErrorOkAndHolds(true)); -} - -TEST(RenameTest, DirectoryToSameDirectory) { - auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - std::string const newpath = NewTempAbsPath(); - ASSERT_THAT(rename(dir.path().c_str(), newpath.c_str()), SyscallSucceeds()); - std::string const oldpath = dir.release(); - dir.reset(newpath); - EXPECT_THAT(Exists(oldpath), IsPosixErrorOkAndHolds(false)); - EXPECT_THAT(Exists(newpath), IsPosixErrorOkAndHolds(true)); -} - -TEST(RenameTest, FileToParentDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir1.path())); - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir2.path())); - std::string const newpath = NewTempAbsPathInDir(dir1.path()); - ASSERT_THAT(rename(f.path().c_str(), newpath.c_str()), SyscallSucceeds()); - std::string const oldpath = f.release(); - f.reset(newpath); - EXPECT_THAT(Exists(oldpath), IsPosixErrorOkAndHolds(false)); - EXPECT_THAT(Exists(newpath), IsPosixErrorOkAndHolds(true)); -} - -TEST(RenameTest, DirectoryToParentDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir1.path())); - auto dir3 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir2.path())); - EXPECT_THAT(IsDirectory(dir3.path()), IsPosixErrorOkAndHolds(true)); - std::string const newpath = NewTempAbsPathInDir(dir1.path()); - ASSERT_THAT(rename(dir3.path().c_str(), newpath.c_str()), SyscallSucceeds()); - std::string const oldpath = dir3.release(); - dir3.reset(newpath); - EXPECT_THAT(Exists(oldpath), IsPosixErrorOkAndHolds(false)); - EXPECT_THAT(Exists(newpath), IsPosixErrorOkAndHolds(true)); - EXPECT_THAT(IsDirectory(newpath), IsPosixErrorOkAndHolds(true)); -} - -TEST(RenameTest, FileToChildDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir1.path())); - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - std::string const newpath = NewTempAbsPathInDir(dir2.path()); - ASSERT_THAT(rename(f.path().c_str(), newpath.c_str()), SyscallSucceeds()); - std::string const oldpath = f.release(); - f.reset(newpath); - EXPECT_THAT(Exists(oldpath), IsPosixErrorOkAndHolds(false)); - EXPECT_THAT(Exists(newpath), IsPosixErrorOkAndHolds(true)); -} - -TEST(RenameTest, DirectoryToChildDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir1.path())); - auto dir3 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir1.path())); - std::string const newpath = NewTempAbsPathInDir(dir2.path()); - ASSERT_THAT(rename(dir3.path().c_str(), newpath.c_str()), SyscallSucceeds()); - std::string const oldpath = dir3.release(); - dir3.reset(newpath); - EXPECT_THAT(Exists(oldpath), IsPosixErrorOkAndHolds(false)); - EXPECT_THAT(Exists(newpath), IsPosixErrorOkAndHolds(true)); - EXPECT_THAT(IsDirectory(newpath), IsPosixErrorOkAndHolds(true)); -} - -TEST(RenameTest, DirectoryToOwnChildDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(dir1.path())); - std::string const newpath = NewTempAbsPathInDir(dir2.path()); - ASSERT_THAT(rename(dir1.path().c_str(), newpath.c_str()), - SyscallFailsWithErrno(EINVAL)); -} - -TEST(RenameTest, FileOverwritesFile) { - auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - dir.path(), "first", TempPath::kDefaultFileMode)); - auto f2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - dir.path(), "second", TempPath::kDefaultFileMode)); - ASSERT_THAT(rename(f1.path().c_str(), f2.path().c_str()), SyscallSucceeds()); - EXPECT_THAT(Exists(f1.path()), IsPosixErrorOkAndHolds(false)); - - f1.release(); - std::string f2_contents; - ASSERT_NO_ERRNO(GetContents(f2.path(), &f2_contents)); - EXPECT_EQ("first", f2_contents); -} - -TEST(RenameTest, DirectoryOverwritesDirectoryLinkCount) { - // Directory link counts are synthetic on overlay filesystems. - SKIP_IF(ASSERT_NO_ERRNO_AND_VALUE(IsOverlayfs(GetAbsoluteTestTmpdir()))); - - auto parent1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - EXPECT_THAT(Links(parent1.path()), IsPosixErrorOkAndHolds(2)); - - auto parent2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - EXPECT_THAT(Links(parent2.path()), IsPosixErrorOkAndHolds(2)); - - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(parent1.path())); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(parent2.path())); - - EXPECT_THAT(Links(parent1.path()), IsPosixErrorOkAndHolds(3)); - EXPECT_THAT(Links(parent2.path()), IsPosixErrorOkAndHolds(3)); - - ASSERT_THAT(rename(dir1.path().c_str(), dir2.path().c_str()), - SyscallSucceeds()); - - EXPECT_THAT(Links(parent1.path()), IsPosixErrorOkAndHolds(2)); - EXPECT_THAT(Links(parent2.path()), IsPosixErrorOkAndHolds(3)); -} - -TEST(RenameTest, FileDoesNotExist) { - auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const std::string source = JoinPath(dir.path(), "source"); - const std::string dest = JoinPath(dir.path(), "dest"); - ASSERT_THAT(rename(source.c_str(), dest.c_str()), - SyscallFailsWithErrno(ENOENT)); -} - -TEST(RenameTest, FileDoesNotOverwriteDirectory) { - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); - auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - ASSERT_THAT(rename(f.path().c_str(), dir.path().c_str()), - SyscallFailsWithErrno(EISDIR)); -} - -TEST(RenameTest, DirectoryDoesNotOverwriteFile) { - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); - auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - ASSERT_THAT(rename(dir.path().c_str(), f.path().c_str()), - SyscallFailsWithErrno(ENOTDIR)); -} - -TEST(RenameTest, DirectoryOverwritesEmptyDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - EXPECT_THAT(rename(dir1.path().c_str(), dir2.path().c_str()), - SyscallSucceeds()); - EXPECT_THAT(Exists(dir1.path()), IsPosixErrorOkAndHolds(false)); - dir1.release(); - EXPECT_THAT(Exists(JoinPath(dir2.path(), Basename(f.path()))), - IsPosixErrorOkAndHolds(true)); - f.release(); -} - -TEST(RenameTest, FailsWithDots) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto dir1_dot = absl::StrCat(dir1.path(), "/."); - auto dir2_dot = absl::StrCat(dir2.path(), "/."); - auto dir1_dot_dot = absl::StrCat(dir1.path(), "/.."); - auto dir2_dot_dot = absl::StrCat(dir2.path(), "/.."); - - // Try with dot paths in the first argument - EXPECT_THAT(rename(dir1_dot.c_str(), dir2.path().c_str()), - SyscallFailsWithErrno(EBUSY)); - EXPECT_THAT(rename(dir1_dot_dot.c_str(), dir2.path().c_str()), - SyscallFailsWithErrno(EBUSY)); - - // Try with dot paths in the second argument - EXPECT_THAT(rename(dir1.path().c_str(), dir2_dot.c_str()), - SyscallFailsWithErrno(EBUSY)); - EXPECT_THAT(rename(dir1.path().c_str(), dir2_dot_dot.c_str()), - SyscallFailsWithErrno(EBUSY)); -} - -TEST(RenameTest, DirectoryDoesNotOverwriteNonemptyDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir2.path())); - ASSERT_THAT(rename(dir1.path().c_str(), dir2.path().c_str()), - SyscallFailsWithErrno(ENOTEMPTY)); -} - -TEST(RenameTest, FailsWhenOldParentNotWritable) { - // Drop capabilities that allow us to override file and directory permissions. - AutoCapability cap1(CAP_DAC_OVERRIDE, false); - AutoCapability cap2(CAP_DAC_READ_SEARCH, false); - - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - // dir1 is not writable. - ASSERT_THAT(chmod(dir1.path().c_str(), 0555), SyscallSucceeds()); - - std::string const newpath = NewTempAbsPathInDir(dir2.path()); - EXPECT_THAT(rename(f1.path().c_str(), newpath.c_str()), - SyscallFailsWithErrno(EACCES)); -} - -TEST(RenameTest, FailsWhenNewParentNotWritable) { - // Drop capabilities that allow us to override file and directory permissions. - AutoCapability cap1(CAP_DAC_OVERRIDE, false); - AutoCapability cap2(CAP_DAC_READ_SEARCH, false); - - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - // dir2 is not writable. - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE( - TempPath::CreateDirWith(GetAbsoluteTestTmpdir(), 0555)); - - std::string const newpath = NewTempAbsPathInDir(dir2.path()); - EXPECT_THAT(rename(f1.path().c_str(), newpath.c_str()), - SyscallFailsWithErrno(EACCES)); -} - -// Equivalent to FailsWhenNewParentNotWritable, but with a destination file -// to overwrite. -TEST(RenameTest, OverwriteFailsWhenNewParentNotWritable) { - // Drop capabilities that allow us to override file and directory permissions. - AutoCapability cap1(CAP_DAC_OVERRIDE, false); - AutoCapability cap2(CAP_DAC_READ_SEARCH, false); - - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - - // dir2 is not writable. - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir2.path())); - ASSERT_THAT(chmod(dir2.path().c_str(), 0555), SyscallSucceeds()); - - EXPECT_THAT(rename(f1.path().c_str(), f2.path().c_str()), - SyscallFailsWithErrno(EACCES)); -} - -// If the parent directory of source is not accessible, rename returns EACCES -// because the user cannot determine if source exists. -TEST(RenameTest, FileDoesNotExistWhenNewParentNotExecutable) { - // Drop capabilities that allow us to override file and directory permissions. - AutoCapability cap1(CAP_DAC_OVERRIDE, false); - AutoCapability cap2(CAP_DAC_READ_SEARCH, false); - - // No execute permission. - auto dir = ASSERT_NO_ERRNO_AND_VALUE( - TempPath::CreateDirWith(GetAbsoluteTestTmpdir(), 0400)); - - const std::string source = JoinPath(dir.path(), "source"); - const std::string dest = JoinPath(dir.path(), "dest"); - ASSERT_THAT(rename(source.c_str(), dest.c_str()), - SyscallFailsWithErrno(EACCES)); -} - -TEST(RenameTest, DirectoryWithOpenFdOverwritesEmptyDirectory) { - auto dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - auto dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - - // Get an fd on dir1 - int fd; - ASSERT_THAT(fd = open(dir1.path().c_str(), O_DIRECTORY), SyscallSucceeds()); - auto close_f = Cleanup([fd] { - // Close the fd on f. - EXPECT_THAT(close(fd), SyscallSucceeds()); - }); - - EXPECT_THAT(rename(dir1.path().c_str(), dir2.path().c_str()), - SyscallSucceeds()); - - const std::string new_f_path = JoinPath(dir2.path(), Basename(f.path())); - - auto remove_f = Cleanup([&] { - // Delete f in its new location. - ASSERT_NO_ERRNO(Delete(new_f_path)); - f.release(); - }); - - EXPECT_THAT(Exists(dir1.path()), IsPosixErrorOkAndHolds(false)); - dir1.release(); - EXPECT_THAT(Exists(new_f_path), IsPosixErrorOkAndHolds(true)); -} - -TEST(RenameTest, FileWithOpenFd) { - TempPath root_dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath dir1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root_dir.path())); - TempPath dir2 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root_dir.path())); - TempPath dir3 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root_dir.path())); - - // Create file in dir1. - constexpr char kContents[] = "foo"; - auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - dir1.path(), kContents, TempPath::kDefaultFileMode)); - - // Get fd on file. - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(f.path(), O_RDWR)); - - // Move f to dir2. - const std::string path2 = NewTempAbsPathInDir(dir2.path()); - ASSERT_THAT(rename(f.path().c_str(), path2.c_str()), SyscallSucceeds()); - - // Read f's kContents. - char buf[sizeof(kContents)]; - EXPECT_THAT(PreadFd(fd.get(), &buf, sizeof(kContents), 0), - SyscallSucceedsWithValue(sizeof(kContents) - 1)); - EXPECT_EQ(absl::string_view(buf, sizeof(buf) - 1), kContents); - - // Move f to dir3. - const std::string path3 = NewTempAbsPathInDir(dir3.path()); - ASSERT_THAT(rename(path2.c_str(), path3.c_str()), SyscallSucceeds()); - - // Read f's kContents. - EXPECT_THAT(PreadFd(fd.get(), &buf, sizeof(kContents), 0), - SyscallSucceedsWithValue(sizeof(kContents) - 1)); - EXPECT_EQ(absl::string_view(buf, sizeof(buf) - 1), kContents); -} - -// Tests that calling rename with file path ending with . or .. causes EBUSY. -TEST(RenameTest, PathEndingWithDots) { - TempPath root_dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath dir1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root_dir.path())); - TempPath dir2 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root_dir.path())); - - // Try to move dir1 into dir2 but mess up the paths. - auto dir1Dot = JoinPath(dir1.path(), "."); - auto dir2Dot = JoinPath(dir2.path(), "."); - auto dir1DotDot = JoinPath(dir1.path(), ".."); - auto dir2DotDot = JoinPath(dir2.path(), ".."); - ASSERT_THAT(rename(dir1.path().c_str(), dir2Dot.c_str()), - SyscallFailsWithErrno(EBUSY)); - ASSERT_THAT(rename(dir1.path().c_str(), dir2DotDot.c_str()), - SyscallFailsWithErrno(EBUSY)); - ASSERT_THAT(rename(dir1Dot.c_str(), dir2.path().c_str()), - SyscallFailsWithErrno(EBUSY)); - ASSERT_THAT(rename(dir1DotDot.c_str(), dir2.path().c_str()), - SyscallFailsWithErrno(EBUSY)); -} - -// Calling rename with file path ending with . or .. causes EBUSY in sysfs. -TEST(RenameTest, SysfsPathEndingWithDots) { - // If a non-root user tries to rename inside /sys then we get EPERM. - SKIP_IF(geteuid() != 0); - ASSERT_THAT(rename("/sys/devices/system/cpu/online", "/sys/."), - SyscallFailsWithErrno(EBUSY)); - ASSERT_THAT(rename("/sys/devices/system/cpu/online", "/sys/.."), - SyscallFailsWithErrno(EBUSY)); -} - -TEST(RenameTest, SysfsFileToSelf) { - // If a non-root user tries to rename inside /sys then we get EPERM. - SKIP_IF(geteuid() != 0); - std::string const path = "/sys/devices/system/cpu/online"; - EXPECT_THAT(rename(path.c_str(), path.c_str()), SyscallSucceeds()); -} - -TEST(RenameTest, SysfsDirectoryToSelf) { - // If a non-root user tries to rename inside /sys then we get EPERM. - SKIP_IF(geteuid() != 0); - std::string const path = "/sys/devices"; - EXPECT_THAT(rename(path.c_str(), path.c_str()), SyscallSucceeds()); -} - -} // namespace - -} // namespace testing -} // namespace gvisor |