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Diffstat (limited to 'test/syscalls/linux/open.cc')
| -rw-r--r-- | test/syscalls/linux/open.cc | 445 |
1 files changed, 0 insertions, 445 deletions
diff --git a/test/syscalls/linux/open.cc b/test/syscalls/linux/open.cc deleted file mode 100644 index 670c0284b..000000000 --- a/test/syscalls/linux/open.cc +++ /dev/null @@ -1,445 +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 <errno.h> -#include <fcntl.h> -#include <linux/capability.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <unistd.h> - -#include "gmock/gmock.h" -#include "gtest/gtest.h" -#include "absl/memory/memory.h" -#include "test/syscalls/linux/file_base.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" -#include "test/util/thread_util.h" - -namespace gvisor { -namespace testing { - -namespace { - -// This test is currently very rudimentary. -// -// There are plenty of extra cases to cover once the sentry supports them. -// -// Different types of opens: -// * O_CREAT -// * O_DIRECTORY -// * O_NOFOLLOW -// * O_PATH <- Will we ever support this? -// -// Special operations on open: -// * O_EXCL -// -// Special files: -// * Blocking behavior for a named pipe. -// -// Different errors: -// * EACCES -// * EEXIST -// * ENAMETOOLONG -// * ELOOP -// * ENOTDIR -// * EPERM -class OpenTest : public FileTest { - void SetUp() override { - FileTest::SetUp(); - - ASSERT_THAT( - write(test_file_fd_.get(), test_data_.c_str(), test_data_.length()), - SyscallSucceedsWithValue(test_data_.length())); - EXPECT_THAT(lseek(test_file_fd_.get(), 0, SEEK_SET), SyscallSucceeds()); - } - - public: - const std::string test_data_ = "hello world\n"; -}; - -TEST_F(OpenTest, OTrunc) { - auto dirpath = JoinPath(GetAbsoluteTestTmpdir(), "truncd"); - ASSERT_THAT(mkdir(dirpath.c_str(), 0777), SyscallSucceeds()); - ASSERT_THAT(open(dirpath.c_str(), O_TRUNC, 0666), - SyscallFailsWithErrno(EISDIR)); -} - -TEST_F(OpenTest, OTruncAndReadOnlyDir) { - auto dirpath = JoinPath(GetAbsoluteTestTmpdir(), "truncd"); - ASSERT_THAT(mkdir(dirpath.c_str(), 0777), SyscallSucceeds()); - ASSERT_THAT(open(dirpath.c_str(), O_TRUNC | O_RDONLY, 0666), - SyscallFailsWithErrno(EISDIR)); -} - -TEST_F(OpenTest, OTruncAndReadOnlyFile) { - auto dirpath = JoinPath(GetAbsoluteTestTmpdir(), "truncfile"); - const FileDescriptor existing = - ASSERT_NO_ERRNO_AND_VALUE(Open(dirpath.c_str(), O_RDWR | O_CREAT, 0666)); - const FileDescriptor otrunc = ASSERT_NO_ERRNO_AND_VALUE( - Open(dirpath.c_str(), O_TRUNC | O_RDONLY, 0666)); -} - -TEST_F(OpenTest, ReadOnly) { - char buf; - const FileDescriptor ro_file = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDONLY)); - - EXPECT_THAT(read(ro_file.get(), &buf, 1), SyscallSucceedsWithValue(1)); - EXPECT_THAT(lseek(ro_file.get(), 0, SEEK_SET), SyscallSucceeds()); - EXPECT_THAT(write(ro_file.get(), &buf, 1), SyscallFailsWithErrno(EBADF)); -} - -TEST_F(OpenTest, WriteOnly) { - char buf; - const FileDescriptor wo_file = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_WRONLY)); - - EXPECT_THAT(read(wo_file.get(), &buf, 1), SyscallFailsWithErrno(EBADF)); - EXPECT_THAT(lseek(wo_file.get(), 0, SEEK_SET), SyscallSucceeds()); - EXPECT_THAT(write(wo_file.get(), &buf, 1), SyscallSucceedsWithValue(1)); -} - -TEST_F(OpenTest, ReadWrite) { - char buf; - const FileDescriptor rw_file = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDWR)); - - EXPECT_THAT(read(rw_file.get(), &buf, 1), SyscallSucceedsWithValue(1)); - EXPECT_THAT(lseek(rw_file.get(), 0, SEEK_SET), SyscallSucceeds()); - EXPECT_THAT(write(rw_file.get(), &buf, 1), SyscallSucceedsWithValue(1)); -} - -TEST_F(OpenTest, RelPath) { - auto name = std::string(Basename(test_file_name_)); - - ASSERT_THAT(chdir(GetAbsoluteTestTmpdir().c_str()), SyscallSucceeds()); - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(name, O_RDONLY)); -} - -TEST_F(OpenTest, AbsPath) { - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDONLY)); -} - -TEST_F(OpenTest, AtRelPath) { - auto name = std::string(Basename(test_file_name_)); - const FileDescriptor dirfd = ASSERT_NO_ERRNO_AND_VALUE( - Open(GetAbsoluteTestTmpdir(), O_RDONLY | O_DIRECTORY)); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(OpenAt(dirfd.get(), name, O_RDONLY)); -} - -TEST_F(OpenTest, AtAbsPath) { - const FileDescriptor dirfd = ASSERT_NO_ERRNO_AND_VALUE( - Open(GetAbsoluteTestTmpdir(), O_RDONLY | O_DIRECTORY)); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(OpenAt(dirfd.get(), test_file_name_, O_RDONLY)); -} - -TEST_F(OpenTest, OpenNoFollowSymlink) { - const std::string link_path = JoinPath(GetAbsoluteTestTmpdir(), "link"); - ASSERT_THAT(symlink(test_file_name_.c_str(), link_path.c_str()), - SyscallSucceeds()); - auto cleanup = Cleanup([link_path]() { - EXPECT_THAT(unlink(link_path.c_str()), SyscallSucceeds()); - }); - - // Open will succeed without O_NOFOLLOW and fails with O_NOFOLLOW. - const FileDescriptor fd2 = - ASSERT_NO_ERRNO_AND_VALUE(Open(link_path, O_RDONLY)); - ASSERT_THAT(open(link_path.c_str(), O_RDONLY | O_NOFOLLOW), - SyscallFailsWithErrno(ELOOP)); -} - -TEST_F(OpenTest, OpenNoFollowStillFollowsLinksInPath) { - // We will create the following structure: - // tmp_folder/real_folder/file - // tmp_folder/sym_folder -> tmp_folder/real_folder - // - // We will then open tmp_folder/sym_folder/file with O_NOFOLLOW and it - // should succeed as O_NOFOLLOW only applies to the final path component. - auto tmp_path = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(GetAbsoluteTestTmpdir())); - auto sym_path = ASSERT_NO_ERRNO_AND_VALUE( - TempPath::CreateSymlinkTo(GetAbsoluteTestTmpdir(), tmp_path.path())); - auto file_path = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(tmp_path.path())); - - auto path_via_symlink = JoinPath(sym_path.path(), Basename(file_path.path())); - const FileDescriptor fd2 = - ASSERT_NO_ERRNO_AND_VALUE(Open(path_via_symlink, O_RDONLY | O_NOFOLLOW)); -} - -// Test that open(2) can follow symlinks that point back to the same tree. -// Test sets up files as follows: -// root/child/symlink => redirects to ../.. -// root/child/target => regular file -// -// open("root/child/symlink/root/child/file") -TEST_F(OpenTest, SymlinkRecurse) { - auto root = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(GetAbsoluteTestTmpdir())); - auto child = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root.path())); - auto symlink = ASSERT_NO_ERRNO_AND_VALUE( - TempPath::CreateSymlinkTo(child.path(), "../..")); - auto target = ASSERT_NO_ERRNO_AND_VALUE( - TempPath::CreateFileWith(child.path(), "abc", 0644)); - auto path_via_symlink = - JoinPath(symlink.path(), Basename(root.path()), Basename(child.path()), - Basename(target.path())); - const auto contents = - ASSERT_NO_ERRNO_AND_VALUE(GetContents(path_via_symlink)); - ASSERT_EQ(contents, "abc"); -} - -TEST_F(OpenTest, Fault) { - char* totally_not_null = nullptr; - ASSERT_THAT(open(totally_not_null, O_RDONLY), SyscallFailsWithErrno(EFAULT)); -} - -TEST_F(OpenTest, AppendOnly) { - // First write some data to the fresh file. - const int64_t kBufSize = 1024; - std::vector<char> buf(kBufSize, 'a'); - - FileDescriptor fd0 = ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDWR)); - - std::fill(buf.begin(), buf.end(), 'a'); - EXPECT_THAT(WriteFd(fd0.get(), buf.data(), buf.size()), - SyscallSucceedsWithValue(buf.size())); - fd0.reset(); // Close the file early. - - // Next get two handles to the same file. We open two files because we want - // to make sure that appending is respected between them. - const FileDescriptor fd1 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDWR | O_APPEND)); - EXPECT_THAT(lseek(fd1.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0)); - - const FileDescriptor fd2 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDWR | O_APPEND)); - EXPECT_THAT(lseek(fd2.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0)); - - // Then try to write to the first file and make sure the bytes are appended. - EXPECT_THAT(WriteFd(fd1.get(), buf.data(), buf.size()), - SyscallSucceedsWithValue(buf.size())); - - // Check that the size of the file is correct and that the offset has been - // incremented to that size. - struct stat s0; - EXPECT_THAT(fstat(fd1.get(), &s0), SyscallSucceeds()); - EXPECT_EQ(s0.st_size, kBufSize * 2); - EXPECT_THAT(lseek(fd1.get(), 0, SEEK_CUR), - SyscallSucceedsWithValue(kBufSize * 2)); - - // Then try to write to the second file and make sure the bytes are appended. - EXPECT_THAT(WriteFd(fd2.get(), buf.data(), buf.size()), - SyscallSucceedsWithValue(buf.size())); - - // Check that the size of the file is correct and that the offset has been - // incremented to that size. - struct stat s1; - EXPECT_THAT(fstat(fd2.get(), &s1), SyscallSucceeds()); - EXPECT_EQ(s1.st_size, kBufSize * 3); - EXPECT_THAT(lseek(fd2.get(), 0, SEEK_CUR), - SyscallSucceedsWithValue(kBufSize * 3)); -} - -TEST_F(OpenTest, AppendConcurrentWrite) { - constexpr int kThreadCount = 5; - constexpr int kBytesPerThread = 10000; - std::unique_ptr<ScopedThread> threads[kThreadCount]; - - // In case of the uncached policy, we expect that a file system can be changed - // externally, so we create a new inode each time when we open a file and we - // can't guarantee that writes to files with O_APPEND will work correctly. - SKIP_IF(getenv("GVISOR_GOFER_UNCACHED")); - - EXPECT_THAT(truncate(test_file_name_.c_str(), 0), SyscallSucceeds()); - - std::string filename = test_file_name_; - DisableSave ds; // Too many syscalls. - // Start kThreadCount threads which will write concurrently into the same - // file. - for (int i = 0; i < kThreadCount; i++) { - threads[i] = absl::make_unique<ScopedThread>([filename]() { - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(filename, O_RDWR | O_APPEND)); - - for (int j = 0; j < kBytesPerThread; j++) { - EXPECT_THAT(WriteFd(fd.get(), &j, 1), SyscallSucceedsWithValue(1)); - } - }); - } - for (int i = 0; i < kThreadCount; i++) { - threads[i]->Join(); - } - - // Check that the size of the file is correct. - struct stat st; - EXPECT_THAT(stat(test_file_name_.c_str(), &st), SyscallSucceeds()); - EXPECT_EQ(st.st_size, kThreadCount * kBytesPerThread); -} - -TEST_F(OpenTest, Truncate) { - { - // First write some data to the new file and close it. - FileDescriptor fd0 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_WRONLY)); - std::vector<char> orig(10, 'a'); - EXPECT_THAT(WriteFd(fd0.get(), orig.data(), orig.size()), - SyscallSucceedsWithValue(orig.size())); - } - - // Then open with truncate and verify that offset is set to 0. - const FileDescriptor fd1 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDWR | O_TRUNC)); - EXPECT_THAT(lseek(fd1.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0)); - - // Then write less data to the file and ensure the old content is gone. - std::vector<char> want(5, 'b'); - EXPECT_THAT(WriteFd(fd1.get(), want.data(), want.size()), - SyscallSucceedsWithValue(want.size())); - - struct stat stat; - EXPECT_THAT(fstat(fd1.get(), &stat), SyscallSucceeds()); - EXPECT_EQ(stat.st_size, want.size()); - EXPECT_THAT(lseek(fd1.get(), 0, SEEK_CUR), - SyscallSucceedsWithValue(want.size())); - - // Read the data and ensure only the latest write is in the file. - std::vector<char> got(want.size() + 1, 'c'); - ASSERT_THAT(pread(fd1.get(), got.data(), got.size(), 0), - SyscallSucceedsWithValue(want.size())); - EXPECT_EQ(memcmp(want.data(), got.data(), want.size()), 0) - << "rbuf=" << got.data(); - EXPECT_EQ(got.back(), 'c'); // Last byte should not have been modified. -} - -TEST_F(OpenTest, NameTooLong) { - char buf[4097] = {}; - memset(buf, 'a', 4097); - EXPECT_THAT(open(buf, O_RDONLY), SyscallFailsWithErrno(ENAMETOOLONG)); -} - -TEST_F(OpenTest, DotsFromRoot) { - const FileDescriptor rootfd = - ASSERT_NO_ERRNO_AND_VALUE(Open("/", O_RDONLY | O_DIRECTORY)); - const FileDescriptor other_rootfd = - ASSERT_NO_ERRNO_AND_VALUE(OpenAt(rootfd.get(), "..", O_RDONLY)); -} - -TEST_F(OpenTest, DirectoryWritableFails) { - ASSERT_THAT(open(GetAbsoluteTestTmpdir().c_str(), O_RDWR), - SyscallFailsWithErrno(EISDIR)); -} - -TEST_F(OpenTest, FileNotDirectory) { - // Create a file and try to open it with O_DIRECTORY. - auto file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); - ASSERT_THAT(open(file.path().c_str(), O_RDONLY | O_DIRECTORY), - SyscallFailsWithErrno(ENOTDIR)); -} - -TEST_F(OpenTest, Null) { - char c = '\0'; - ASSERT_THAT(open(&c, O_RDONLY), SyscallFailsWithErrno(ENOENT)); -} - -// NOTE(b/119785738): While the man pages specify that this behavior should be -// undefined, Linux truncates the file on opening read only if we have write -// permission, so we will too. -TEST_F(OpenTest, CanTruncateReadOnly) { - const FileDescriptor fd1 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDONLY | O_TRUNC)); - - struct stat stat; - EXPECT_THAT(fstat(fd1.get(), &stat), SyscallSucceeds()); - EXPECT_EQ(stat.st_size, 0); -} - -// If we don't have read permission on the file, opening with -// O_TRUNC should fail. -TEST_F(OpenTest, CanTruncateReadOnlyNoWritePermission_NoRandomSave) { - // Drop capabilities that allow us to override file permissions. - ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false)); - - const DisableSave ds; // Permissions are dropped. - ASSERT_THAT(chmod(test_file_name_.c_str(), S_IRUSR | S_IRGRP), - SyscallSucceeds()); - - ASSERT_THAT(open(test_file_name_.c_str(), O_RDONLY | O_TRUNC), - SyscallFailsWithErrno(EACCES)); - - const FileDescriptor fd1 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDONLY)); - - struct stat stat; - EXPECT_THAT(fstat(fd1.get(), &stat), SyscallSucceeds()); - EXPECT_EQ(stat.st_size, test_data_.size()); -} - -// If we don't have read permission but have write permission, opening O_WRONLY -// and O_TRUNC should succeed. -TEST_F(OpenTest, CanTruncateWriteOnlyNoReadPermission_NoRandomSave) { - const DisableSave ds; // Permissions are dropped. - - EXPECT_THAT(fchmod(test_file_fd_.get(), S_IWUSR | S_IWGRP), - SyscallSucceeds()); - - const FileDescriptor fd1 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_WRONLY | O_TRUNC)); - - EXPECT_THAT(fchmod(test_file_fd_.get(), S_IRUSR | S_IRGRP), - SyscallSucceeds()); - - const FileDescriptor fd2 = - ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDONLY)); - - struct stat stat; - EXPECT_THAT(fstat(fd2.get(), &stat), SyscallSucceeds()); - EXPECT_EQ(stat.st_size, 0); -} - -TEST_F(OpenTest, CanTruncateWithStrangePermissions) { - ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false)); - ASSERT_NO_ERRNO(SetCapability(CAP_DAC_READ_SEARCH, false)); - const DisableSave ds; // Permissions are dropped. - std::string path = NewTempAbsPath(); - int fd; - // Create a file without user permissions. - EXPECT_THAT( // SAVE_BELOW - fd = open(path.c_str(), O_CREAT | O_TRUNC | O_WRONLY, 055), - SyscallSucceeds()); - EXPECT_THAT(close(fd), SyscallSucceeds()); - - // Cannot open file because we are owner and have no permissions set. - EXPECT_THAT(open(path.c_str(), O_RDONLY), SyscallFailsWithErrno(EACCES)); - - // We *can* chmod the file, because we are the owner. - EXPECT_THAT(chmod(path.c_str(), 0755), SyscallSucceeds()); - - // Now we can open the file again. - EXPECT_THAT(fd = open(path.c_str(), O_RDWR), SyscallSucceeds()); - EXPECT_THAT(close(fd), SyscallSucceeds()); -} - -} // namespace - -} // namespace testing -} // namespace gvisor |