203 lines
7.7 KiB
C++
203 lines
7.7 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/temp_path.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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TEST(LseekTest, InvalidWhence) {
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const std::string kFileData = "hello world\n";
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const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
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ASSERT_THAT(lseek(fd.get(), 0, -1), SyscallFailsWithErrno(EINVAL));
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}
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TEST(LseekTest, NegativeOffset) {
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const std::string kFileData = "hello world\n";
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const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
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EXPECT_THAT(lseek(fd.get(), -(kFileData.length() + 1), SEEK_CUR),
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SyscallFailsWithErrno(EINVAL));
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}
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// A 32-bit off_t is not large enough to represent an offset larger than
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// maximum file size on standard file systems, so it isn't possible to cause
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// overflow.
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#ifdef __x86_64__
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TEST(LseekTest, Overflow) {
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// HA! Classic Linux. We really should have an EOVERFLOW
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// here, since we're seeking to something that cannot be
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// represented.. but instead we are given an EINVAL.
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const std::string kFileData = "hello world\n";
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const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
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EXPECT_THAT(lseek(fd.get(), 0x7fffffffffffffff, SEEK_END),
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SyscallFailsWithErrno(EINVAL));
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}
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#endif
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TEST(LseekTest, Set) {
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const std::string kFileData = "hello world\n";
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const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
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char buf = '\0';
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EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallSucceedsWithValue(0));
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ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
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EXPECT_EQ(buf, kFileData.c_str()[0]);
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EXPECT_THAT(lseek(fd.get(), 6, SEEK_SET), SyscallSucceedsWithValue(6));
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ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
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EXPECT_EQ(buf, kFileData.c_str()[6]);
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}
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TEST(LseekTest, Cur) {
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const std::string kFileData = "hello world\n";
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const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
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char buf = '\0';
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EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallSucceedsWithValue(0));
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ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
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EXPECT_EQ(buf, kFileData.c_str()[0]);
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EXPECT_THAT(lseek(fd.get(), 3, SEEK_CUR), SyscallSucceedsWithValue(4));
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ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
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EXPECT_EQ(buf, kFileData.c_str()[4]);
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}
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TEST(LseekTest, End) {
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const std::string kFileData = "hello world\n";
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const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
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char buf = '\0';
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EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallSucceedsWithValue(0));
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ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
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EXPECT_EQ(buf, kFileData.c_str()[0]);
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EXPECT_THAT(lseek(fd.get(), -2, SEEK_END), SyscallSucceedsWithValue(10));
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ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
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EXPECT_EQ(buf, kFileData.c_str()[kFileData.length() - 2]);
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}
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TEST(LseekTest, InvalidFD) {
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EXPECT_THAT(lseek(-1, 0, SEEK_SET), SyscallFailsWithErrno(EBADF));
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}
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TEST(LseekTest, DirCurEnd) {
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const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open("/tmp", O_RDONLY));
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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}
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TEST(LseekTest, ProcDir) {
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/self", O_RDONLY));
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_END), SyscallSucceeds());
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}
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TEST(LseekTest, ProcFile) {
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/meminfo", O_RDONLY));
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_END), SyscallFailsWithErrno(EINVAL));
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}
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TEST(LseekTest, SysDir) {
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open("/sys/devices", O_RDONLY));
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_END), SyscallSucceeds());
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}
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TEST(LseekTest, SeekCurrentDir) {
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// From include/linux/fs.h.
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constexpr loff_t MAX_LFS_FILESIZE = 0x7fffffffffffffff;
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char* dir = get_current_dir_name();
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const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(dir, O_RDONLY));
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
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ASSERT_THAT(lseek(fd.get(), 0, SEEK_END),
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// Some filesystems (like ext4) allow lseek(SEEK_END) on a
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// directory and return MAX_LFS_FILESIZE, others return EINVAL.
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AnyOf(SyscallSucceedsWithValue(MAX_LFS_FILESIZE),
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SyscallFailsWithErrno(EINVAL)));
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free(dir);
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}
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TEST(LseekTest, ProcStatTwice) {
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const FileDescriptor fd1 =
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ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/stat", O_RDONLY));
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const FileDescriptor fd2 =
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ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/stat", O_RDONLY));
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ASSERT_THAT(lseek(fd1.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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ASSERT_THAT(lseek(fd1.get(), 0, SEEK_END), SyscallFailsWithErrno(EINVAL));
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ASSERT_THAT(lseek(fd1.get(), 1000, SEEK_CUR), SyscallSucceeds());
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// Check that just because we moved fd1, fd2 doesn't move.
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ASSERT_THAT(lseek(fd2.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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const FileDescriptor fd3 =
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ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/stat", O_RDONLY));
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ASSERT_THAT(lseek(fd3.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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}
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TEST(LseekTest, EtcPasswdDup) {
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const FileDescriptor fd1 =
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ASSERT_NO_ERRNO_AND_VALUE(Open("/etc/passwd", O_RDONLY));
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const FileDescriptor fd2 = ASSERT_NO_ERRNO_AND_VALUE(fd1.Dup());
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ASSERT_THAT(lseek(fd1.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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ASSERT_THAT(lseek(fd2.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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ASSERT_THAT(lseek(fd1.get(), 1000, SEEK_CUR), SyscallSucceeds());
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// Check that just because we moved fd1, fd2 doesn't move.
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ASSERT_THAT(lseek(fd2.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(1000));
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const FileDescriptor fd3 = ASSERT_NO_ERRNO_AND_VALUE(fd1.Dup());
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ASSERT_THAT(lseek(fd3.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(1000));
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}
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// TODO(magi): Add tests where we have donated in sockets.
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} // namespace
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} // namespace testing
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} // namespace gvisor
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