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// 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 <stdlib.h>
#include <sys/stat.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 {
TEST(LseekTest, InvalidWhence) {
const std::string kFileData = "hello world\n";
const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
ASSERT_THAT(lseek(fd.get(), 0, -1), SyscallFailsWithErrno(EINVAL));
}
TEST(LseekTest, NegativeOffset) {
const std::string kFileData = "hello world\n";
const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
EXPECT_THAT(lseek(fd.get(), -(kFileData.length() + 1), SEEK_CUR),
SyscallFailsWithErrno(EINVAL));
}
// A 32-bit off_t is not large enough to represent an offset larger than
// maximum file size on standard file systems, so it isn't possible to cause
// overflow.
#if defined(__x86_64__) || defined(__aarch64__)
TEST(LseekTest, Overflow) {
// HA! Classic Linux. We really should have an EOVERFLOW
// here, since we're seeking to something that cannot be
// represented.. but instead we are given an EINVAL.
const std::string kFileData = "hello world\n";
const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
EXPECT_THAT(lseek(fd.get(), 0x7fffffffffffffff, SEEK_END),
SyscallFailsWithErrno(EINVAL));
}
#endif
TEST(LseekTest, Set) {
const std::string kFileData = "hello world\n";
const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
char buf = '\0';
EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallSucceedsWithValue(0));
ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
EXPECT_EQ(buf, kFileData.c_str()[0]);
EXPECT_THAT(lseek(fd.get(), 6, SEEK_SET), SyscallSucceedsWithValue(6));
ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
EXPECT_EQ(buf, kFileData.c_str()[6]);
}
TEST(LseekTest, Cur) {
const std::string kFileData = "hello world\n";
const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
char buf = '\0';
EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallSucceedsWithValue(0));
ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
EXPECT_EQ(buf, kFileData.c_str()[0]);
EXPECT_THAT(lseek(fd.get(), 3, SEEK_CUR), SyscallSucceedsWithValue(4));
ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
EXPECT_EQ(buf, kFileData.c_str()[4]);
}
TEST(LseekTest, End) {
const std::string kFileData = "hello world\n";
const TempPath path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
GetAbsoluteTestTmpdir(), kFileData, TempPath::kDefaultFileMode));
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(path.path(), O_RDWR, 0644));
char buf = '\0';
EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallSucceedsWithValue(0));
ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
EXPECT_EQ(buf, kFileData.c_str()[0]);
EXPECT_THAT(lseek(fd.get(), -2, SEEK_END), SyscallSucceedsWithValue(10));
ASSERT_THAT(read(fd.get(), &buf, 1), SyscallSucceedsWithValue(1));
EXPECT_EQ(buf, kFileData.c_str()[kFileData.length() - 2]);
}
TEST(LseekTest, InvalidFD) {
EXPECT_THAT(lseek(-1, 0, SEEK_SET), SyscallFailsWithErrno(EBADF));
}
TEST(LseekTest, DirCurEnd) {
const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open("/tmp", O_RDONLY));
ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
}
TEST(LseekTest, ProcDir) {
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/self", O_RDONLY));
ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
ASSERT_THAT(lseek(fd.get(), 0, SEEK_END), SyscallSucceeds());
}
TEST(LseekTest, ProcFile) {
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/meminfo", O_RDONLY));
ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
ASSERT_THAT(lseek(fd.get(), 0, SEEK_END), SyscallFailsWithErrno(EINVAL));
}
TEST(LseekTest, SysDir) {
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open("/sys/devices", O_RDONLY));
ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
ASSERT_THAT(lseek(fd.get(), 0, SEEK_END), SyscallSucceeds());
}
TEST(LseekTest, SeekCurrentDir) {
// From include/linux/fs.h.
constexpr loff_t MAX_LFS_FILESIZE = 0x7fffffffffffffff;
char* dir = getcwd(NULL, 0);
const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(dir, O_RDONLY));
ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceeds());
ASSERT_THAT(lseek(fd.get(), 0, SEEK_END),
// Some filesystems (like ext4) allow lseek(SEEK_END) on a
// directory and return MAX_LFS_FILESIZE, others return EINVAL.
AnyOf(SyscallSucceedsWithValue(MAX_LFS_FILESIZE),
SyscallFailsWithErrno(EINVAL)));
free(dir);
}
TEST(LseekTest, ProcStatTwice) {
const FileDescriptor fd1 =
ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/stat", O_RDONLY));
const FileDescriptor fd2 =
ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/stat", O_RDONLY));
ASSERT_THAT(lseek(fd1.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
ASSERT_THAT(lseek(fd1.get(), 0, SEEK_END), SyscallFailsWithErrno(EINVAL));
ASSERT_THAT(lseek(fd1.get(), 1000, SEEK_CUR), SyscallSucceeds());
// Check that just because we moved fd1, fd2 doesn't move.
ASSERT_THAT(lseek(fd2.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
const FileDescriptor fd3 =
ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/stat", O_RDONLY));
ASSERT_THAT(lseek(fd3.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
}
TEST(LseekTest, EtcPasswdDup) {
const FileDescriptor fd1 =
ASSERT_NO_ERRNO_AND_VALUE(Open("/etc/passwd", O_RDONLY));
const FileDescriptor fd2 = ASSERT_NO_ERRNO_AND_VALUE(fd1.Dup());
ASSERT_THAT(lseek(fd1.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
ASSERT_THAT(lseek(fd2.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
ASSERT_THAT(lseek(fd1.get(), 1000, SEEK_CUR), SyscallSucceeds());
// Check that just because we moved fd1, fd2 doesn't move.
ASSERT_THAT(lseek(fd2.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(1000));
const FileDescriptor fd3 = ASSERT_NO_ERRNO_AND_VALUE(fd1.Dup());
ASSERT_THAT(lseek(fd3.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(1000));
}
// TODO(magi): Add tests where we have donated in sockets.
} // namespace
} // namespace testing
} // namespace gvisor
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