1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
// 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(GetAbsoluteTestTmpdir().c_str(), 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
|
