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fd-uitl: rename PIPE_EBADF → EBADF_PAIR, and add EBADF_TRIPLET
[thirdparty/systemd.git] / src / test / test-fd-util.c
CommitLineData
db9ecf05 1/* SPDX-License-Identifier: LGPL-2.1-or-later */
0999c8ad
RC		 2
3#include <fcntl.h>
a70877d8 4#include <sys/eventfd.h>
58dfcc57 5#include <sys/mount.h>
0999c8ad
RC		 6#include <unistd.h>
7
8#include "alloc-util.h"
6a818c3c 9#include "data-fd-util.h"
0999c8ad
RC		 10#include "fd-util.h"
11#include "fileio.h"
8067fe86 12#include "fs-util.h"
0999c8ad 13#include "macro.h"
0a970718 14#include "memory-util.h"
b6891972 15#include "missing_syscall.h"
58dfcc57 16#include "mkdir.h"
b6891972 17#include "mount-util.h"
58dfcc57 18#include "namespace-util.h"
aa11e28b
LP		 19#include "path-util.h"
20#include "process-util.h"
a548e14d 21#include "random-util.h"
59c4bbfb 22#include "rlimit-util.h"
58dfcc57 23#include "rm-rf.h"
b6891972 24#include "seccomp-util.h"
0a2152f0 25#include "serialize.h"
fdb583e6 26#include "stat-util.h"
a548e14d 27#include "string-util.h"
6d7c4033 28#include "tests.h"
e4de7287 29#include "tmpfile-util.h"
0999c8ad 30
4f7452a8 31TEST(close_many) {
0999c8ad 32 int fds[3];
596b44b1
DT		 33 _cleanup_(unlink_tempfilep) char name0[] = "/tmp/test-close-many.XXXXXX";
34 _cleanup_(unlink_tempfilep) char name1[] = "/tmp/test-close-many.XXXXXX";
35 _cleanup_(unlink_tempfilep) char name2[] = "/tmp/test-close-many.XXXXXX";
0999c8ad 36
646853bd
TM		 37 fds[0] = mkostemp_safe(name0);
38 fds[1] = mkostemp_safe(name1);
39 fds[2] = mkostemp_safe(name2);
0999c8ad
RC		 40
41 close_many(fds, 2);
42
43 assert_se(fcntl(fds[0], F_GETFD) == -1);
44 assert_se(fcntl(fds[1], F_GETFD) == -1);
45 assert_se(fcntl(fds[2], F_GETFD) >= 0);
46
47 safe_close(fds[2]);
0999c8ad
RC		 48}
49
4f7452a8 50TEST(close_nointr) {
596b44b1 51 _cleanup_(unlink_tempfilep) char name[] = "/tmp/test-test-close_nointr.XXXXXX";
0999c8ad
RC		 52 int fd;
53
646853bd 54 fd = mkostemp_safe(name);
0999c8ad
RC		 55 assert_se(fd >= 0);
56 assert_se(close_nointr(fd) >= 0);
57 assert_se(close_nointr(fd) < 0);
0999c8ad
RC		 58}
59
4f7452a8 60TEST(same_fd) {
34014779 61 _cleanup_close_pair_ int p[2];
254d1313 62 _cleanup_close_ int a, b, c;
0999c8ad
RC		 63
64 assert_se(pipe2(p, O_CLOEXEC) >= 0);
43dc7aa2 65 assert_se((a = fcntl(p[0], F_DUPFD, 3)) >= 0);
0999c8ad 66 assert_se((b = open("/dev/null", O_RDONLY|O_CLOEXEC)) >= 0);
43dc7aa2 67 assert_se((c = fcntl(a, F_DUPFD, 3)) >= 0);
0999c8ad
RC		 68
69 assert_se(same_fd(p[0], p[0]) > 0);
70 assert_se(same_fd(p[1], p[1]) > 0);
71 assert_se(same_fd(a, a) > 0);
72 assert_se(same_fd(b, b) > 0);
73
74 assert_se(same_fd(a, p[0]) > 0);
75 assert_se(same_fd(p[0], a) > 0);
76 assert_se(same_fd(c, p[0]) > 0);
77 assert_se(same_fd(p[0], c) > 0);
78 assert_se(same_fd(a, c) > 0);
79 assert_se(same_fd(c, a) > 0);
80
81 assert_se(same_fd(p[0], p[1]) == 0);
82 assert_se(same_fd(p[1], p[0]) == 0);
83 assert_se(same_fd(p[0], b) == 0);
84 assert_se(same_fd(b, p[0]) == 0);
85 assert_se(same_fd(p[1], a) == 0);
86 assert_se(same_fd(a, p[1]) == 0);
87 assert_se(same_fd(p[1], b) == 0);
88 assert_se(same_fd(b, p[1]) == 0);
89
90 assert_se(same_fd(a, b) == 0);
91 assert_se(same_fd(b, a) == 0);
92}
93
4f7452a8 94TEST(open_serialization_fd) {
254d1313 95 _cleanup_close_ int fd = -EBADF;
504afd7c
ZJS		 96
97 fd = open_serialization_fd("test");
98 assert_se(fd >= 0);
99
ca9b2b4d 100 assert_se(write(fd, "test\n", 5) == 5);
504afd7c
ZJS		 101}
102
81b913f0
LB		 103TEST(open_serialization_file) {
104 _cleanup_fclose_ FILE *f = NULL;
105 int r;
106
107 r = open_serialization_file("test", &f);
108 assert_se(r >= 0);
109 assert_se(f);
110
111 assert_se(fwrite("test\n", 1, 5, f) == 5);
112}
113
4f7452a8 114TEST(fd_move_above_stdio) {
7fe2903c
LP		 115 int original_stdin, new_fd;
116
117 original_stdin = fcntl(0, F_DUPFD, 3);
118 assert_se(original_stdin >= 3);
119 assert_se(close_nointr(0) != EBADF);
120
121 new_fd = open("/dev/null", O_RDONLY);
122 assert_se(new_fd == 0);
123
124 new_fd = fd_move_above_stdio(new_fd);
125 assert_se(new_fd >= 3);
126
127 assert_se(dup(original_stdin) == 0);
128 assert_se(close_nointr(original_stdin) != EBADF);
129 assert_se(close_nointr(new_fd) != EBADF);
130}
131
4f7452a8 132TEST(rearrange_stdio) {
aa11e28b
LP		 133 pid_t pid;
134 int r;
135
136 r = safe_fork("rearrange", FORK_WAIT|FORK_LOG, &pid);
137 assert_se(r >= 0);
138
139 if (r == 0) {
140 _cleanup_free_ char *path = NULL;
141 char buffer[10];
142
143 /* Child */
144
145 safe_close(STDERR_FILENO); /* Let's close an fd < 2, to make it more interesting */
146
5bb1d7fb 147 assert_se(rearrange_stdio(-EBADF, -EBADF, -EBADF) >= 0);
aa11e28b
LP		 148
149 assert_se(fd_get_path(STDIN_FILENO, &path) >= 0);
150 assert_se(path_equal(path, "/dev/null"));
151 path = mfree(path);
152
153 assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0);
154 assert_se(path_equal(path, "/dev/null"));
155 path = mfree(path);
156
157 assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0);
158 assert_se(path_equal(path, "/dev/null"));
159 path = mfree(path);
160
161 safe_close(STDIN_FILENO);
162 safe_close(STDOUT_FILENO);
163 safe_close(STDERR_FILENO);
164
165 {
166 int pair[2];
167 assert_se(pipe(pair) >= 0);
168 assert_se(pair[0] == 0);
169 assert_se(pair[1] == 1);
170 assert_se(fd_move_above_stdio(0) == 3);
171 }
172 assert_se(open("/dev/full", O_WRONLY|O_CLOEXEC) == 0);
173 assert_se(acquire_data_fd("foobar", 6, 0) == 2);
174
175 assert_se(rearrange_stdio(2, 0, 1) >= 0);
176
177 assert_se(write(1, "x", 1) < 0 && errno == ENOSPC);
178 assert_se(write(2, "z", 1) == 1);
179 assert_se(read(3, buffer, sizeof(buffer)) == 1);
180 assert_se(buffer[0] == 'z');
181 assert_se(read(0, buffer, sizeof(buffer)) == 6);
182 assert_se(memcmp(buffer, "foobar", 6) == 0);
183
5bb1d7fb 184 assert_se(rearrange_stdio(-EBADF, 1, 2) >= 0);
aa11e28b
LP		 185 assert_se(write(1, "a", 1) < 0 && errno == ENOSPC);
186 assert_se(write(2, "y", 1) == 1);
187 assert_se(read(3, buffer, sizeof(buffer)) == 1);
188 assert_se(buffer[0] == 'y');
189
190 assert_se(fd_get_path(0, &path) >= 0);
191 assert_se(path_equal(path, "/dev/null"));
192 path = mfree(path);
193
194 _exit(EXIT_SUCCESS);
195 }
196}
197
4f7452a8 198TEST(read_nr_open) {
9264cc39
LP		 199 log_info("nr-open: %i", read_nr_open());
200}
201
59c4bbfb
LP		 202static size_t validate_fds(
203 bool opened,
204 const int *fds,
205 size_t n_fds) {
206
207 size_t c = 0;
208
209 /* Validates that fds in the specified array are one of the following three:
210 *
211 * 1. < 0 (test is skipped) or
212 * 2. opened (if 'opened' param is true) or
213 * 3. closed (if 'opened' param is false)
214 */
215
216 for (size_t i = 0; i < n_fds; i++) {
217 if (fds[i] < 0)
218 continue;
219
220 if (opened)
221 assert_se(fcntl(fds[i], F_GETFD) >= 0);
222 else
223 assert_se(fcntl(fds[i], F_GETFD) < 0 && errno == EBADF);
224
225 c++;
226 }
227
228 return c; /* Return number of fds >= 0 in the array */
229}
230
b6891972 231static void test_close_all_fds_inner(void) {
59c4bbfb 232 _cleanup_free_ int *fds = NULL, *keep = NULL;
59c4bbfb 233 size_t n_fds, n_keep;
73fc0cbc 234 int max_fd;
59c4bbfb
LP		 235
236 log_info("/* %s */", __func__);
237
238 rlimit_nofile_bump(-1);
239
73fc0cbc
LP		 240 max_fd = get_max_fd();
241 assert_se(max_fd > 10);
59c4bbfb 242
b6891972
LP		 243 if (max_fd > 7000) {
244 /* If the worst fallback is activated we need to iterate through all possible fds, hence,
245 * let's lower the limit a small bit, so that we don't run for too long. Yes, this undoes the
246 * rlimit_nofile_bump() call above partially. */
247
248 (void) setrlimit_closest(RLIMIT_NOFILE, &(struct rlimit) { 7000, 7000 });
249 max_fd = 7000;
250 }
251
59c4bbfb 252 /* Try to use 5000 fds, but when we can't bump the rlimit to make that happen use the whole limit minus 10 */
73fc0cbc 253 n_fds = MIN(((size_t) max_fd & ~1U) - 10U, 5000U);
59c4bbfb
LP		 254 assert_se((n_fds & 1U) == 0U); /* make sure even number of fds */
255
256 /* Allocate the determined number of fds, always two at a time */
257 assert_se(fds = new(int, n_fds));
258 for (size_t i = 0; i < n_fds; i += 2)
259 assert_se(pipe2(fds + i, O_CLOEXEC) >= 0);
260
261 /* Validate this worked */
262 assert_se(validate_fds(true, fds, n_fds) == n_fds);
263
264 /* Randomized number of fds to keep, but at most every second */
265 n_keep = (random_u64() % (n_fds / 2));
266
267 /* Now randomly select a number of fds from the array above to keep */
268 assert_se(keep = new(int, n_keep));
269 for (size_t k = 0; k < n_keep; k++) {
270 for (;;) {
271 size_t p;
272
273 p = random_u64() % n_fds;
274 if (fds[p] >= 0) {
275 keep[k] = TAKE_FD(fds[p]);
276 break;
277 }
278 }
279 }
280
281 /* Check that all fds from both arrays are still open, and test how many in each are >= 0 */
282 assert_se(validate_fds(true, fds, n_fds) == n_fds - n_keep);
283 assert_se(validate_fds(true, keep, n_keep) == n_keep);
284
285 /* Close logging fd first, so that we don't confuse it by closing its fd */
286 log_close();
287 log_set_open_when_needed(true);
a3b00f91 288 log_settle_target();
59c4bbfb
LP		 289
290 /* Close all but the ones to keep */
291 assert_se(close_all_fds(keep, n_keep) >= 0);
292
293 assert_se(validate_fds(false, fds, n_fds) == n_fds - n_keep);
294 assert_se(validate_fds(true, keep, n_keep) == n_keep);
295
296 /* Close everything else too! */
297 assert_se(close_all_fds(NULL, 0) >= 0);
298
299 assert_se(validate_fds(false, fds, n_fds) == n_fds - n_keep);
300 assert_se(validate_fds(false, keep, n_keep) == n_keep);
301
302 log_set_open_when_needed(false);
303 log_open();
304}
305
b6891972 306static int seccomp_prohibit_close_range(void) {
7a8288f6 307#if HAVE_SECCOMP && defined(__SNR_close_range)
b6891972
LP		 308 _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL;
309 int r;
310
311 r = seccomp_init_for_arch(&seccomp, SCMP_ARCH_NATIVE, SCMP_ACT_ALLOW);
312 if (r < 0)
313 return log_warning_errno(r, "Failed to acquire seccomp context, ignoring: %m");
314
315 r = seccomp_rule_add_exact(
316 seccomp,
317 SCMP_ACT_ERRNO(EPERM),
318 SCMP_SYS(close_range),
319 0);
320 if (r < 0)
321 return log_warning_errno(r, "Failed to add close_range() rule, ignoring: %m");
322
323 r = seccomp_load(seccomp);
324 if (r < 0)
325 return log_warning_errno(r, "Failed to apply close_range() restrictions, ignoring: %m");
326
327 return 0;
328#else
a6f44d61 329 return log_warning_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Seccomp support or close_range() syscall definition not available.");
b6891972
LP		 330#endif
331}
332
4f7452a8 333TEST(close_all_fds) {
b6891972
LP		 334 int r;
335
336 /* Runs the test four times. Once as is. Once with close_range() syscall blocked via seccomp, once
3ed332e7
ZJS		 337 * with /proc/ overmounted, and once with the combination of both. This should trigger all fallbacks
338 * in the close_range_all() function. */
b6891972
LP		 339
340 r = safe_fork("(caf-plain)", FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
341 if (r == 0) {
342 test_close_all_fds_inner();
343 _exit(EXIT_SUCCESS);
344 }
345 assert_se(r >= 0);
346
3ed332e7
ZJS		 347 if (geteuid() != 0)
348 return (void) log_tests_skipped("Lacking privileges for test with close_range() blocked and /proc/ overmounted");
b6891972
LP		 349
350 r = safe_fork("(caf-noproc)", FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, NULL);
351 if (r == 0) {
352 r = mount_nofollow_verbose(LOG_WARNING, "tmpfs", "/proc", "tmpfs", 0, NULL);
353 if (r < 0)
3ed332e7 354 log_notice("Overmounting /proc/ didn't work, skipping close_all_fds() with masked /proc/.");
b6891972
LP		 355 else
356 test_close_all_fds_inner();
357 _exit(EXIT_SUCCESS);
358 }
359 assert_se(r >= 0);
360
3ed332e7
ZJS		 361 if (!is_seccomp_available())
362 return (void) log_tests_skipped("Seccomp not available");
b6891972
LP		 363
364 r = safe_fork("(caf-seccomp)", FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
365 if (r == 0) {
366 r = seccomp_prohibit_close_range();
367 if (r < 0)
368 log_notice("Applying seccomp filter didn't work, skipping close_all_fds() test with masked close_range().");
369 else
370 test_close_all_fds_inner();
371
372 _exit(EXIT_SUCCESS);
373 }
374 assert_se(r >= 0);
375
376 r = safe_fork("(caf-scnp)", FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, NULL);
377 if (r == 0) {
378 r = seccomp_prohibit_close_range();
379 if (r < 0)
380 log_notice("Applying seccomp filter didn't work, skipping close_all_fds() test with masked close_range().");
381 else {
382 r = mount_nofollow_verbose(LOG_WARNING, "tmpfs", "/proc", "tmpfs", 0, NULL);
383 if (r < 0)
3ed332e7 384 log_notice("Overmounting /proc/ didn't work, skipping close_all_fds() with masked /proc/.");
b6891972
LP		 385 else
386 test_close_all_fds_inner();
387 }
388
389 test_close_all_fds_inner();
390 _exit(EXIT_SUCCESS);
391 }
392 assert_se(r >= 0);
393}
394
4f7452a8 395TEST(format_proc_fd_path) {
7b9da386
LP		 396 assert_se(streq_ptr(FORMAT_PROC_FD_PATH(0), "/proc/self/fd/0"));
397 assert_se(streq_ptr(FORMAT_PROC_FD_PATH(1), "/proc/self/fd/1"));
398 assert_se(streq_ptr(FORMAT_PROC_FD_PATH(2), "/proc/self/fd/2"));
399 assert_se(streq_ptr(FORMAT_PROC_FD_PATH(3), "/proc/self/fd/3"));
400 assert_se(streq_ptr(FORMAT_PROC_FD_PATH(2147483647), "/proc/self/fd/2147483647"));
48a01cd9
LP		 401}
402
4f7452a8 403TEST(fd_reopen) {
254d1313 404 _cleanup_close_ int fd1 = -EBADF, fd2 = -EBADF;
61fb966c
LP		 405 struct stat st1, st2;
406 int fl;
407
408 /* Test this with a directory */
409 fd1 = open("/proc", O_DIRECTORY|O_PATH|O_CLOEXEC);
410 assert_se(fd1 >= 0);
411
412 assert_se(fstat(fd1, &st1) >= 0);
413 assert_se(S_ISDIR(st1.st_mode));
414
415 fl = fcntl(fd1, F_GETFL);
416 assert_se(fl >= 0);
417 assert_se(FLAGS_SET(fl, O_DIRECTORY));
418 assert_se(FLAGS_SET(fl, O_PATH));
419
fdb583e6
LP		 420 /* fd_reopen() with O_NOFOLLOW will systematically fail, since it is implemented via a symlink in /proc/self/fd/ */
421 assert_se(fd_reopen(fd1, O_RDONLY|O_CLOEXEC|O_NOFOLLOW) == -ELOOP);
422 assert_se(fd_reopen(fd1, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW) == -ELOOP);
423
61fb966c
LP		 424 fd2 = fd_reopen(fd1, O_RDONLY|O_DIRECTORY|O_CLOEXEC); /* drop the O_PATH */
425 assert_se(fd2 >= 0);
426
427 assert_se(fstat(fd2, &st2) >= 0);
428 assert_se(S_ISDIR(st2.st_mode));
09a7cef5 429 assert_se(stat_inode_same(&st1, &st2));
61fb966c
LP		 430
431 fl = fcntl(fd2, F_GETFL);
432 assert_se(fl >= 0);
433 assert_se(FLAGS_SET(fl, O_DIRECTORY));
434 assert_se(!FLAGS_SET(fl, O_PATH));
435
436 safe_close(fd1);
437
438 fd1 = fd_reopen(fd2, O_DIRECTORY|O_PATH|O_CLOEXEC); /* reacquire the O_PATH */
439 assert_se(fd1 >= 0);
440
441 assert_se(fstat(fd1, &st1) >= 0);
442 assert_se(S_ISDIR(st1.st_mode));
09a7cef5 443 assert_se(stat_inode_same(&st1, &st2));
61fb966c
LP		 444
445 fl = fcntl(fd1, F_GETFL);
446 assert_se(fl >= 0);
447 assert_se(FLAGS_SET(fl, O_DIRECTORY));
448 assert_se(FLAGS_SET(fl, O_PATH));
449
450 safe_close(fd1);
451
452 /* And now, test this with a file. */
453 fd1 = open("/proc/version", O_PATH|O_CLOEXEC);
454 assert_se(fd1 >= 0);
455
456 assert_se(fstat(fd1, &st1) >= 0);
457 assert_se(S_ISREG(st1.st_mode));
458
459 fl = fcntl(fd1, F_GETFL);
460 assert_se(fl >= 0);
461 assert_se(!FLAGS_SET(fl, O_DIRECTORY));
462 assert_se(FLAGS_SET(fl, O_PATH));
463
464 assert_se(fd_reopen(fd1, O_RDONLY|O_DIRECTORY|O_CLOEXEC) == -ENOTDIR);
465 fd2 = fd_reopen(fd1, O_RDONLY|O_CLOEXEC); /* drop the O_PATH */
466 assert_se(fd2 >= 0);
467
468 assert_se(fstat(fd2, &st2) >= 0);
469 assert_se(S_ISREG(st2.st_mode));
09a7cef5 470 assert_se(stat_inode_same(&st1, &st2));
61fb966c
LP		 471
472 fl = fcntl(fd2, F_GETFL);
473 assert_se(fl >= 0);
474 assert_se(!FLAGS_SET(fl, O_DIRECTORY));
475 assert_se(!FLAGS_SET(fl, O_PATH));
476
477 safe_close(fd1);
478
479 assert_se(fd_reopen(fd2, O_DIRECTORY|O_PATH|O_CLOEXEC) == -ENOTDIR);
480 fd1 = fd_reopen(fd2, O_PATH|O_CLOEXEC); /* reacquire the O_PATH */
481 assert_se(fd1 >= 0);
482
483 assert_se(fstat(fd1, &st1) >= 0);
484 assert_se(S_ISREG(st1.st_mode));
09a7cef5 485 assert_se(stat_inode_same(&st1, &st2));
61fb966c
LP		 486
487 fl = fcntl(fd1, F_GETFL);
488 assert_se(fl >= 0);
489 assert_se(!FLAGS_SET(fl, O_DIRECTORY));
490 assert_se(FLAGS_SET(fl, O_PATH));
491
492 /* Also check the right error is generated if the fd is already closed */
493 safe_close(fd1);
494 assert_se(fd_reopen(fd1, O_RDONLY|O_CLOEXEC) == -EBADF);
254d1313 495 fd1 = -EBADF;
fdb583e6
LP		 496
497 /* Validate what happens if we reopen a symlink */
498 fd1 = open("/proc/self", O_PATH|O_CLOEXEC|O_NOFOLLOW);
499 assert_se(fd1 >= 0);
500 assert_se(fstat(fd1, &st1) >= 0);
501 assert_se(S_ISLNK(st1.st_mode));
502
503 fd2 = fd_reopen(fd1, O_PATH|O_CLOEXEC);
504 assert_se(fd2 >= 0);
505 assert_se(fstat(fd2, &st2) >= 0);
506 assert_se(S_ISLNK(st2.st_mode));
507 assert_se(stat_inode_same(&st1, &st2));
508 fd2 = safe_close(fd2);
509
510 /* So here's the thing: if we have an O_PATH fd to a symlink, we *cannot* convert it to a regular fd
511 * with that. i.e. you cannot have the VFS follow a symlink pinned via an O_PATH fd. */
512 assert_se(fd_reopen(fd1, O_RDONLY|O_CLOEXEC) == -ELOOP);
61fb966c
LP		 513}
514
5f5865f0 515TEST(fd_reopen_condition) {
254d1313 516 _cleanup_close_ int fd1 = -EBADF, fd3 = -EBADF;
5f5865f0
LP		 517 int fd2, fl;
518
519 /* Open without O_PATH */
520 fd1 = open("/usr/", O_RDONLY|O_DIRECTORY|O_CLOEXEC);
521 assert_se(fd1 >= 0);
522
523 fl = fcntl(fd1, F_GETFL);
524 assert_se(FLAGS_SET(fl, O_DIRECTORY));
525 assert_se(!FLAGS_SET(fl, O_PATH));
526
527 fd2 = fd_reopen_condition(fd1, O_DIRECTORY, O_DIRECTORY|O_PATH, &fd3);
528 assert_se(fd2 == fd1);
529 assert_se(fd3 < 0);
530
531 /* Switch on O_PATH */
532 fd2 = fd_reopen_condition(fd1, O_DIRECTORY|O_PATH, O_DIRECTORY|O_PATH, &fd3);
533 assert_se(fd2 != fd1);
534 assert_se(fd3 == fd2);
535
536 fl = fcntl(fd2, F_GETFL);
537 assert_se(FLAGS_SET(fl, O_DIRECTORY));
538 assert_se(FLAGS_SET(fl, O_PATH));
539
540 close_and_replace(fd1, fd3);
541
542 fd2 = fd_reopen_condition(fd1, O_DIRECTORY|O_PATH, O_DIRECTORY|O_PATH, &fd3);
543 assert_se(fd2 == fd1);
544 assert_se(fd3 < 0);
545
546 /* Switch off O_PATH again */
547 fd2 = fd_reopen_condition(fd1, O_DIRECTORY, O_DIRECTORY|O_PATH, &fd3);
548 assert_se(fd2 != fd1);
549 assert_se(fd3 == fd2);
550
551 fl = fcntl(fd2, F_GETFL);
552 assert_se(FLAGS_SET(fl, O_DIRECTORY));
553 assert_se(!FLAGS_SET(fl, O_PATH));
554
555 close_and_replace(fd1, fd3);
556
557 fd2 = fd_reopen_condition(fd1, O_DIRECTORY, O_DIRECTORY|O_PATH, &fd3);
558 assert_se(fd2 == fd1);
559 assert_se(fd3 < 0);
560}
561
4f7452a8 562TEST(take_fd) {
254d1313 563 _cleanup_close_ int fd1 = -EBADF, fd2 = -EBADF;
71136404 564 int array[2] = EBADF_PAIR, i = 0;
a70877d8 565
254d1313
ZJS		 566 assert_se(fd1 == -EBADF);
567 assert_se(fd2 == -EBADF);
a70877d8
LP		 568
569 fd1 = eventfd(0, EFD_CLOEXEC);
570 assert_se(fd1 >= 0);
571
572 fd2 = TAKE_FD(fd1);
254d1313 573 assert_se(fd1 == -EBADF);
a70877d8
LP		 574 assert_se(fd2 >= 0);
575
254d1313
ZJS		 576 assert_se(array[0] == -EBADF);
577 assert_se(array[1] == -EBADF);
a70877d8
LP		 578
579 array[0] = TAKE_FD(fd2);
254d1313
ZJS		 580 assert_se(fd1 == -EBADF);
581 assert_se(fd2 == -EBADF);
a70877d8 582 assert_se(array[0] >= 0);
254d1313 583 assert_se(array[1] == -EBADF);
a70877d8
LP		 584
585 array[1] = TAKE_FD(array[i]);
254d1313 586 assert_se(array[0] == -EBADF);
a70877d8
LP		 587 assert_se(array[1] >= 0);
588
589 i = 1 - i;
590 array[0] = TAKE_FD(*(array + i));
591 assert_se(array[0] >= 0);
254d1313 592 assert_se(array[1] == -EBADF);
a70877d8
LP		 593
594 i = 1 - i;
595 fd1 = TAKE_FD(array[i]);
596 assert_se(fd1 >= 0);
254d1313
ZJS		 597 assert_se(array[0] == -EBADF);
598 assert_se(array[1] == -EBADF);
a70877d8
LP		 599}
600
af423b4b
DDM		 601TEST(dir_fd_is_root) {
602 _cleanup_close_ int fd = -EBADF;
58dfcc57 603 int r;
af423b4b 604
70650ae3
YW		 605 assert_se(dir_fd_is_root_or_cwd(AT_FDCWD) > 0);
606
af423b4b
DDM		 607 assert_se((fd = open("/", O_CLOEXEC|O_PATH|O_DIRECTORY|O_NOFOLLOW)) >= 0);
608 assert_se(dir_fd_is_root(fd) > 0);
70650ae3 609 assert_se(dir_fd_is_root_or_cwd(fd) > 0);
af423b4b
DDM		 610
611 fd = safe_close(fd);
612
613 assert_se((fd = open("/usr", O_CLOEXEC|O_PATH|O_DIRECTORY|O_NOFOLLOW)) >= 0);
614 assert_se(dir_fd_is_root(fd) == 0);
70650ae3 615 assert_se(dir_fd_is_root_or_cwd(fd) == 0);
58dfcc57
YW		 616
617 r = detach_mount_namespace();
618 if (r < 0)
619 return (void) log_tests_skipped_errno(r, "Failed to detach mount namespace");
620
621 _cleanup_(rm_rf_physical_and_freep) char *tmp = NULL;
622 _cleanup_free_ char *x = NULL, *y = NULL;
623
624 assert_se(mkdtemp_malloc("/tmp/test-mkdir-XXXXXX", &tmp) >= 0);
625 assert_se(x = path_join(tmp, "x"));
626 assert_se(y = path_join(tmp, "x/y"));
627 assert_se(mkdir_p(y, 0755) >= 0);
628 assert_se(mount_nofollow_verbose(LOG_DEBUG, x, y, NULL, MS_BIND, NULL) >= 0);
629
630 fd = safe_close(fd);
631
632 assert_se((fd = open(tmp, O_CLOEXEC|O_PATH|O_DIRECTORY|O_NOFOLLOW)) >= 0);
633 assert_se(dir_fd_is_root(fd) == 0);
70650ae3 634 assert_se(dir_fd_is_root_or_cwd(fd) == 0);
58dfcc57
YW		 635
636 fd = safe_close(fd);
637
638 assert_se((fd = open(x, O_CLOEXEC|O_PATH|O_DIRECTORY|O_NOFOLLOW)) >= 0);
639 assert_se(dir_fd_is_root(fd) == 0);
70650ae3 640 assert_se(dir_fd_is_root_or_cwd(fd) == 0);
58dfcc57
YW		 641
642 fd = safe_close(fd);
643
644 assert_se((fd = open(y, O_CLOEXEC|O_PATH|O_DIRECTORY|O_NOFOLLOW)) >= 0);
645 assert_se(dir_fd_is_root(fd) == 0);
70650ae3 646 assert_se(dir_fd_is_root_or_cwd(fd) == 0);
af423b4b
DDM		 647}
648
8067fe86
YW		 649TEST(fd_get_path) {
650 _cleanup_(rm_rf_physical_and_freep) char *t = NULL;
651 _cleanup_close_ int tfd = -EBADF, fd = -EBADF;
652 _cleanup_free_ char *p = NULL, *q = NULL, *saved_cwd = NULL;
653
654 tfd = mkdtemp_open(NULL, O_PATH, &t);
655 assert_se(tfd >= 0);
656 assert_se(fd_get_path(tfd, &p) >= 0);
657 assert_se(streq(p, t));
658
659 p = mfree(p);
660
661 assert_se(safe_getcwd(&saved_cwd) >= 0);
662 assert_se(chdir(t) >= 0);
663
46693a79
YW		 664 assert_se(fd_get_path(AT_FDCWD, &p) >= 0);
665 assert_se(streq(p, t));
666
667 p = mfree(p);
668
8067fe86
YW		 669 assert_se(q = path_join(t, "regular"));
670 assert_se(touch(q) >= 0);
671 assert_se(mkdirat_parents(tfd, "subdir/symlink", 0755) >= 0);
672 assert_se(symlinkat("../regular", tfd, "subdir/symlink") >= 0);
673 assert_se(symlinkat("subdir", tfd, "symdir") >= 0);
674
675 fd = openat(tfd, "regular", O_CLOEXEC|O_PATH);
676 assert_se(fd >= 0);
677 assert_se(fd_get_path(fd, &p) >= 0);
678 assert_se(streq(p, q));
679
680 p = mfree(p);
681 fd = safe_close(fd);
682
683 fd = openat(AT_FDCWD, "regular", O_CLOEXEC|O_PATH);
684 assert_se(fd >= 0);
685 assert_se(fd_get_path(fd, &p) >= 0);
686 assert_se(streq(p, q));
687
688 p = mfree(p);
689 fd = safe_close(fd);
690
691 fd = openat(tfd, "subdir/symlink", O_CLOEXEC|O_PATH);
692 assert_se(fd >= 0);
693 assert_se(fd_verify_regular(fd) >= 0);
694 assert_se(fd_get_path(fd, &p) >= 0);
695 assert_se(streq(p, q));
696
697 p = mfree(p);
698 fd = safe_close(fd);
699
700 fd = openat(AT_FDCWD, "subdir/symlink", O_CLOEXEC|O_PATH);
701 assert_se(fd >= 0);
702 assert_se(fd_verify_regular(fd) >= 0);
703 assert_se(fd_get_path(fd, &p) >= 0);
704 assert_se(streq(p, q));
705
706 p = mfree(p);
707 fd = safe_close(fd);
708
709 fd = openat(tfd, "symdir//./symlink", O_CLOEXEC|O_PATH);
710 assert_se(fd >= 0);
711 assert_se(fd_verify_regular(fd) >= 0);
712 assert_se(fd_get_path(fd, &p) >= 0);
713 assert_se(streq(p, q));
714
715 p = mfree(p);
716 fd = safe_close(fd);
717
718 fd = openat(AT_FDCWD, "symdir//./symlink", O_CLOEXEC|O_PATH);
719 assert_se(fd >= 0);
720 assert_se(fd_verify_regular(fd) >= 0);
721 assert_se(fd_get_path(fd, &p) >= 0);
722 assert_se(streq(p, q));
723
724 p = mfree(p);
725 q = mfree(q);
726 fd = safe_close(fd);
727
728 assert_se(q = path_join(t, "subdir/symlink"));
729 fd = openat(tfd, "subdir/symlink", O_CLOEXEC|O_PATH|O_NOFOLLOW);
730 assert_se(fd >= 0);
731 assert_se(fd_verify_regular(fd) == -ELOOP);
732 assert_se(fd_get_path(fd, &p) >= 0);
733 assert_se(streq(p, q));
734
735 p = mfree(p);
736 fd = safe_close(fd);
737
738 fd = openat(AT_FDCWD, "subdir/symlink", O_CLOEXEC|O_PATH|O_NOFOLLOW);
739 assert_se(fd >= 0);
740 assert_se(fd_verify_regular(fd) == -ELOOP);
741 assert_se(fd_get_path(fd, &p) >= 0);
742 assert_se(streq(p, q));
743
744 p = mfree(p);
745 fd = safe_close(fd);
746
747 fd = openat(tfd, "symdir//./symlink", O_CLOEXEC|O_PATH|O_NOFOLLOW);
748 assert_se(fd >= 0);
749 assert_se(fd_verify_regular(fd) == -ELOOP);
750 assert_se(fd_get_path(fd, &p) >= 0);
751 assert_se(streq(p, q));
752
753 p = mfree(p);
754 fd = safe_close(fd);
755
756 fd = openat(AT_FDCWD, "symdir//./symlink", O_CLOEXEC|O_PATH|O_NOFOLLOW);
757 assert_se(fd >= 0);
758 assert_se(fd_verify_regular(fd) == -ELOOP);
759 assert_se(fd_get_path(fd, &p) >= 0);
760 assert_se(streq(p, q));
761
762 assert_se(chdir(saved_cwd) >= 0);
763}
764
4f7452a8 765DEFINE_TEST_MAIN(LOG_DEBUG);
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