1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <gtest/gtest.h>
18
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <string.h>
22 #include <sys/utsname.h>
23 #include <sys/vfs.h>
24
25 #include <android-base/file.h>
26 #include <android-base/silent_death_test.h>
27 #include <android-base/stringprintf.h>
28
29 // Glibc v2.19 doesn't include these in fcntl.h so host builds will fail without.
30 #if !defined(FALLOC_FL_PUNCH_HOLE) || !defined(FALLOC_FL_KEEP_SIZE)
31 #include <linux/falloc.h>
32 #endif
33 #if !defined(EXT4_SUPER_MAGIC)
34 #include <linux/magic.h>
35 #endif
36
37 using fcntl_DeathTest = SilentDeathTest;
38
TEST(fcntl,fcntl_smoke)39 TEST(fcntl, fcntl_smoke) {
40 int fd = open("/proc/version", O_RDONLY);
41 ASSERT_TRUE(fd != -1);
42
43 int flags = fcntl(fd, F_GETFD);
44 ASSERT_TRUE(flags != -1);
45 ASSERT_EQ(0, flags & FD_CLOEXEC);
46
47 int rc = fcntl(fd, F_SETFD, FD_CLOEXEC);
48 ASSERT_EQ(0, rc);
49
50 flags = fcntl(fd, F_GETFD);
51 ASSERT_TRUE(flags != -1);
52 ASSERT_EQ(FD_CLOEXEC, flags & FD_CLOEXEC);
53
54 close(fd);
55 }
56
TEST(fcntl,open_open64)57 TEST(fcntl, open_open64) {
58 int fd;
59
60 fd = open("/proc/version", O_RDONLY);
61 ASSERT_TRUE(fd != -1);
62 close(fd);
63
64 fd = open64("/proc/version", O_RDONLY);
65 ASSERT_TRUE(fd != -1);
66 close(fd);
67 }
68
TEST(fcntl,openat_openat64)69 TEST(fcntl, openat_openat64) {
70 int fd;
71
72 fd = openat(AT_FDCWD, "/proc/version", O_RDONLY);
73 ASSERT_TRUE(fd != -1);
74 close(fd);
75
76 fd = openat64(AT_FDCWD, "/proc/version", O_RDONLY);
77 ASSERT_TRUE(fd != -1);
78 close(fd);
79 }
80
TEST(fcntl,creat_creat64)81 TEST(fcntl, creat_creat64) {
82 ASSERT_EQ(-1, creat("", 0666));
83 ASSERT_EQ(ENOENT, errno);
84 ASSERT_EQ(-1, creat64("", 0666));
85 ASSERT_EQ(ENOENT, errno);
86 }
87
TEST(fcntl,posix_fadvise)88 TEST(fcntl, posix_fadvise) {
89 TemporaryFile tf;
90 errno = 0;
91
92 EXPECT_EQ(EBADF, posix_fadvise(-1, 0, 0, POSIX_FADV_NORMAL));
93 EXPECT_EQ(0, errno);
94
95 EXPECT_EQ(EBADF, posix_fadvise64(-1, 0, 0, POSIX_FADV_NORMAL));
96 EXPECT_EQ(0, errno);
97
98 EXPECT_EQ(EINVAL, posix_fadvise(tf.fd, 0, 0, -1));
99 EXPECT_EQ(0, errno);
100
101 EXPECT_EQ(EINVAL, posix_fadvise64(tf.fd, 0, 0, -1));
102 EXPECT_EQ(0, errno);
103
104 EXPECT_EQ(0, posix_fadvise(tf.fd, 0, 0, POSIX_FADV_NORMAL));
105 EXPECT_EQ(0, posix_fadvise64(tf.fd, 0, 0, POSIX_FADV_NORMAL));
106 }
107
TEST(fcntl,fallocate_EINVAL)108 TEST(fcntl, fallocate_EINVAL) {
109 TemporaryFile tf;
110
111 // fallocate/fallocate64 set errno.
112 // posix_fallocate/posix_fallocate64 return an errno value.
113
114 errno = 0;
115 ASSERT_EQ(-1, fallocate(tf.fd, 0, 0, -1));
116 ASSERT_EQ(EINVAL, errno);
117
118 errno = 0;
119 ASSERT_EQ(-1, fallocate64(tf.fd, 0, 0, -1));
120 ASSERT_EQ(EINVAL, errno);
121
122 errno = 0;
123 ASSERT_EQ(EINVAL, posix_fallocate(tf.fd, 0, -1));
124 ASSERT_EQ(0, errno);
125
126 errno = 0;
127 ASSERT_EQ(EINVAL, posix_fallocate64(tf.fd, 0, -1));
128 ASSERT_EQ(0, errno);
129 }
130
TEST(fcntl,fallocate)131 TEST(fcntl, fallocate) {
132 TemporaryFile tf;
133 struct stat sb;
134 ASSERT_EQ(0, fstat(tf.fd, &sb));
135 ASSERT_EQ(0, sb.st_size);
136
137 #if defined(__BIONIC__)
138 ASSERT_EQ(0, fallocate(tf.fd, 0, 0, 1));
139 ASSERT_EQ(0, fstat(tf.fd, &sb));
140 ASSERT_EQ(1, sb.st_size);
141
142 ASSERT_EQ(0, fallocate64(tf.fd, 0, 0, 2));
143 ASSERT_EQ(0, fstat(tf.fd, &sb));
144 ASSERT_EQ(2, sb.st_size);
145 #endif
146
147 ASSERT_EQ(0, posix_fallocate(tf.fd, 0, 3));
148 ASSERT_EQ(0, fstat(tf.fd, &sb));
149 ASSERT_EQ(3, sb.st_size);
150
151 ASSERT_EQ(0, posix_fallocate64(tf.fd, 0, 4));
152 ASSERT_EQ(0, fstat(tf.fd, &sb));
153 ASSERT_EQ(4, sb.st_size);
154 }
155
TEST(fcntl,f_getlk)156 TEST(fcntl, f_getlk) {
157 int fd = open("/proc/version", O_RDONLY);
158 ASSERT_TRUE(fd != -1);
159
160 struct flock check_lock;
161 check_lock.l_type = F_WRLCK;
162 check_lock.l_start = 0;
163 check_lock.l_whence = SEEK_SET;
164 check_lock.l_len = 0;
165
166 ASSERT_EQ(0, fcntl(fd, F_GETLK, &check_lock));
167 close(fd);
168 }
169
TEST(fcntl,f_getlk64)170 TEST(fcntl, f_getlk64) {
171 int fd = open64("/proc/version", O_RDONLY);
172 ASSERT_TRUE(fd != -1);
173
174 struct flock64 check_lock;
175 check_lock.l_type = F_WRLCK;
176 check_lock.l_start = 0;
177 check_lock.l_whence = SEEK_SET;
178 check_lock.l_len = 0;
179
180 ASSERT_EQ(0, fcntl(fd, F_GETLK64, &check_lock));
181 close(fd);
182 }
183
TEST(fcntl,splice)184 TEST(fcntl, splice) {
185 int pipe_fds[2];
186 ASSERT_EQ(0, pipe(pipe_fds));
187
188 int in = open("/proc/cpuinfo", O_RDONLY);
189 ASSERT_NE(in, -1);
190
191 TemporaryFile tf;
192
193 ssize_t bytes_read = splice(in, nullptr, pipe_fds[1], nullptr, 8*1024, SPLICE_F_MORE | SPLICE_F_MOVE);
194 ASSERT_NE(bytes_read, -1);
195
196 ssize_t bytes_written = splice(pipe_fds[0], nullptr, tf.fd, nullptr, bytes_read, SPLICE_F_MORE | SPLICE_F_MOVE);
197 ASSERT_EQ(bytes_read, bytes_written);
198
199 close(pipe_fds[0]);
200 close(pipe_fds[1]);
201 close(in);
202 }
203
TEST(fcntl,vmsplice)204 TEST(fcntl, vmsplice) {
205 int pipe_fds[2];
206 ASSERT_EQ(0, pipe(pipe_fds));
207
208 iovec v[2];
209 v[0].iov_base = const_cast<char*>("hello ");
210 v[0].iov_len = 6;
211 v[1].iov_base = const_cast<char*>("world\n");
212 v[1].iov_len = 6;
213 ssize_t bytes_written = vmsplice(pipe_fds[1], v, sizeof(v)/sizeof(iovec), 0);
214 ASSERT_EQ(v[0].iov_len + v[1].iov_len, static_cast<size_t>(bytes_written));
215 close(pipe_fds[1]);
216
217 char buf[BUFSIZ];
218 FILE* fp = fdopen(pipe_fds[0], "r");
219 ASSERT_TRUE(fp != nullptr);
220 ASSERT_TRUE(fgets(buf, sizeof(buf), fp) != nullptr);
221 fclose(fp);
222 ASSERT_STREQ("hello world\n", buf);
223 }
224
TEST(fcntl,tee)225 TEST(fcntl, tee) {
226 char expected[BUFSIZ];
227 FILE* expected_fp = fopen("/proc/version", "r");
228 ASSERT_TRUE(expected_fp != nullptr);
229 ASSERT_TRUE(fgets(expected, sizeof(expected), expected_fp) != nullptr);
230 fclose(expected_fp);
231
232 int pipe1[2];
233 ASSERT_EQ(0, pipe(pipe1));
234
235 int pipe2[2];
236 ASSERT_EQ(0, pipe(pipe2));
237
238 int in = open("/proc/version", O_RDONLY);
239 ASSERT_NE(in, -1);
240
241 // Write /proc/version into pipe1.
242 ssize_t bytes_read = splice(in, nullptr, pipe1[1], nullptr, 8*1024, SPLICE_F_MORE | SPLICE_F_MOVE);
243 ASSERT_NE(bytes_read, -1);
244 close(pipe1[1]);
245
246 // Tee /proc/version from pipe1 into pipe2.
247 ssize_t bytes_teed = tee(pipe1[0], pipe2[1], SIZE_MAX, 0);
248 ASSERT_EQ(bytes_read, bytes_teed);
249 close(pipe2[1]);
250
251 // The out fds of both pipe1 and pipe2 should now contain /proc/version.
252 char buf1[BUFSIZ];
253 FILE* fp1 = fdopen(pipe1[0], "r");
254 ASSERT_TRUE(fp1 != nullptr);
255 ASSERT_TRUE(fgets(buf1, sizeof(buf1), fp1) != nullptr);
256 fclose(fp1);
257
258 char buf2[BUFSIZ];
259 FILE* fp2 = fdopen(pipe2[0], "r");
260 ASSERT_TRUE(fp2 != nullptr);
261 ASSERT_TRUE(fgets(buf2, sizeof(buf2), fp2) != nullptr);
262 fclose(fp2);
263
264 ASSERT_STREQ(expected, buf1);
265 ASSERT_STREQ(expected, buf2);
266 }
267
TEST(fcntl,readahead)268 TEST(fcntl, readahead) {
269 // Just check that the function is available.
270 errno = 0;
271 ASSERT_EQ(-1, readahead(-1, 0, 123));
272 ASSERT_EQ(EBADF, errno);
273 }
274
TEST(fcntl,sync_file_range)275 TEST(fcntl, sync_file_range) {
276 // Just check that the function is available.
277 errno = 0;
278 ASSERT_EQ(-1, sync_file_range(-1, 0, 0, 0));
279 ASSERT_EQ(EBADF, errno);
280
281 TemporaryFile tf;
282 ASSERT_EQ(0, sync_file_range(tf.fd, 0, 0, 0));
283
284 // The arguments to the underlying system call are in a different order on 32-bit ARM.
285 // Check that the `flags` argument gets passed to the kernel correctly.
286 errno = 0;
287 ASSERT_EQ(-1, sync_file_range(tf.fd, 0, 0, ~0));
288 ASSERT_EQ(EINVAL, errno);
289 }
290
parse_kernel_release(long * const major,long * const minor)291 static bool parse_kernel_release(long* const major, long* const minor) {
292 struct utsname buf;
293 if (uname(&buf) == -1) {
294 return false;
295 }
296 return sscanf(buf.release, "%ld.%ld", major, minor) == 2;
297 }
298
299 /*
300 * b/28760453:
301 * Kernels older than 4.1 should have ext4 FALLOC_FL_PUNCH_HOLE disabled due to CVE-2015-8839.
302 * Devices that fail this test should cherry-pick the following commit:
303 * https://android.googlesource.com/kernel/msm/+/bdba352e898cbf57c8620ad68c8abf749c784d1f
304 */
TEST(fcntl,falloc_punch)305 TEST(fcntl, falloc_punch) {
306 long major = 0, minor = 0;
307 ASSERT_TRUE(parse_kernel_release(&major, &minor));
308
309 if (major < 4 || (major == 4 && minor < 1)) {
310 TemporaryFile tf;
311 struct statfs sfs;
312 ASSERT_EQ(0, fstatfs(tf.fd, &sfs));
313 if (sfs.f_type == EXT4_SUPER_MAGIC) {
314 ASSERT_EQ(-1, fallocate(tf.fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 1));
315 ASSERT_EQ(errno, EOPNOTSUPP);
316 }
317 }
318 }
319
TEST(fcntl,open_O_TMPFILE_mode)320 TEST(fcntl, open_O_TMPFILE_mode) {
321 #if __BIONIC__ // Our glibc is too old for O_TMPFILE.
322 TemporaryDir dir;
323 // Without O_EXCL, we're allowed to give this a name later.
324 // (This is unrelated to the O_CREAT interaction with O_EXCL.)
325 const mode_t perms = S_IRUSR | S_IWUSR;
326 int fd = open(dir.path, O_TMPFILE | O_RDWR, perms);
327
328 // Ignore kernels without O_TMPFILE support (< 3.11).
329 if (fd == -1 && (errno == EISDIR || errno == EINVAL || errno == EOPNOTSUPP)) return;
330
331 ASSERT_TRUE(fd != -1) << strerror(errno);
332
333 // Does the fd claim to have the mode we set?
334 struct stat sb = {};
335 ASSERT_EQ(0, fstat(fd, &sb));
336 ASSERT_EQ(perms, (sb.st_mode & ~S_IFMT));
337
338 // On Android if we're not root, we won't be able to create links anyway...
339 if (getuid() != 0) return;
340
341 std::string final_path = android::base::StringPrintf("%s/named_now", dir.path);
342 ASSERT_EQ(0, linkat(AT_FDCWD, android::base::StringPrintf("/proc/self/fd/%d", fd).c_str(),
343 AT_FDCWD, final_path.c_str(),
344 AT_SYMLINK_FOLLOW));
345 ASSERT_EQ(0, close(fd));
346
347 // Does the resulting file claim to have the mode we set?
348 ASSERT_EQ(0, stat(final_path.c_str(), &sb));
349 ASSERT_EQ(perms, (sb.st_mode & ~S_IFMT));
350
351 // With O_EXCL, you're not allowed to add a name later.
352 fd = open(dir.path, O_TMPFILE | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
353 ASSERT_TRUE(fd != -1) << strerror(errno);
354 errno = 0;
355 ASSERT_EQ(-1, linkat(AT_FDCWD, android::base::StringPrintf("/proc/self/fd/%d", fd).c_str(),
356 AT_FDCWD, android::base::StringPrintf("%s/no_chance", dir.path).c_str(),
357 AT_SYMLINK_FOLLOW));
358 ASSERT_EQ(ENOENT, errno);
359 ASSERT_EQ(0, close(fd));
360 #endif
361 }
362
TEST(fcntl_DeathTest,fcntl_F_SETFD)363 TEST(fcntl_DeathTest, fcntl_F_SETFD) {
364 EXPECT_DEATH(fcntl(0, F_SETFD, O_NONBLOCK), "non-FD_CLOEXEC");
365 }
366