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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
4f5ce5e8 DH |
2 | #define _GNU_SOURCE |
3 | #define __EXPORTED_HEADERS__ | |
4 | ||
5 | #include <errno.h> | |
6 | #include <inttypes.h> | |
7 | #include <limits.h> | |
8 | #include <linux/falloc.h> | |
1c49e378 | 9 | #include <fcntl.h> |
4f5ce5e8 DH |
10 | #include <linux/memfd.h> |
11 | #include <sched.h> | |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <signal.h> | |
15 | #include <string.h> | |
16 | #include <sys/mman.h> | |
17 | #include <sys/stat.h> | |
18 | #include <sys/syscall.h> | |
c1ee4831 | 19 | #include <sys/wait.h> |
4f5ce5e8 DH |
20 | #include <unistd.h> |
21 | ||
29f34d1d MAL |
22 | #include "common.h" |
23 | ||
1f522a48 | 24 | #define MEMFD_STR "memfd:" |
3037aeb9 | 25 | #define MEMFD_HUGE_STR "memfd-hugetlb:" |
1f522a48 MK |
26 | #define SHARED_FT_STR "(shared file-table)" |
27 | ||
4f5ce5e8 | 28 | #define MFD_DEF_SIZE 8192 |
1f78dda2 | 29 | #define STACK_SIZE 65536 |
4f5ce5e8 | 30 | |
1f522a48 MK |
31 | /* |
32 | * Default is not to test hugetlbfs | |
33 | */ | |
1f522a48 | 34 | static size_t mfd_def_size = MFD_DEF_SIZE; |
3037aeb9 | 35 | static const char *memfd_str = MEMFD_STR; |
1f522a48 | 36 | |
4f5ce5e8 DH |
37 | static int mfd_assert_new(const char *name, loff_t sz, unsigned int flags) |
38 | { | |
39 | int r, fd; | |
40 | ||
41 | fd = sys_memfd_create(name, flags); | |
42 | if (fd < 0) { | |
43 | printf("memfd_create(\"%s\", %u) failed: %m\n", | |
44 | name, flags); | |
45 | abort(); | |
46 | } | |
47 | ||
48 | r = ftruncate(fd, sz); | |
49 | if (r < 0) { | |
50 | printf("ftruncate(%llu) failed: %m\n", (unsigned long long)sz); | |
51 | abort(); | |
52 | } | |
53 | ||
54 | return fd; | |
55 | } | |
56 | ||
54402986 JFG |
57 | static int mfd_assert_reopen_fd(int fd_in) |
58 | { | |
d42990f4 | 59 | int fd; |
54402986 JFG |
60 | char path[100]; |
61 | ||
62 | sprintf(path, "/proc/self/fd/%d", fd_in); | |
63 | ||
64 | fd = open(path, O_RDWR); | |
65 | if (fd < 0) { | |
66 | printf("re-open of existing fd %d failed\n", fd_in); | |
67 | abort(); | |
68 | } | |
69 | ||
70 | return fd; | |
71 | } | |
72 | ||
4f5ce5e8 DH |
73 | static void mfd_fail_new(const char *name, unsigned int flags) |
74 | { | |
75 | int r; | |
76 | ||
77 | r = sys_memfd_create(name, flags); | |
78 | if (r >= 0) { | |
79 | printf("memfd_create(\"%s\", %u) succeeded, but failure expected\n", | |
80 | name, flags); | |
81 | close(r); | |
82 | abort(); | |
83 | } | |
84 | } | |
85 | ||
57e67900 | 86 | static unsigned int mfd_assert_get_seals(int fd) |
4f5ce5e8 | 87 | { |
57e67900 | 88 | int r; |
4f5ce5e8 DH |
89 | |
90 | r = fcntl(fd, F_GET_SEALS); | |
91 | if (r < 0) { | |
92 | printf("GET_SEALS(%d) failed: %m\n", fd); | |
93 | abort(); | |
94 | } | |
95 | ||
57e67900 | 96 | return (unsigned int)r; |
4f5ce5e8 DH |
97 | } |
98 | ||
57e67900 | 99 | static void mfd_assert_has_seals(int fd, unsigned int seals) |
4f5ce5e8 | 100 | { |
57e67900 | 101 | unsigned int s; |
4f5ce5e8 DH |
102 | |
103 | s = mfd_assert_get_seals(fd); | |
104 | if (s != seals) { | |
57e67900 | 105 | printf("%u != %u = GET_SEALS(%d)\n", seals, s, fd); |
4f5ce5e8 DH |
106 | abort(); |
107 | } | |
108 | } | |
109 | ||
57e67900 | 110 | static void mfd_assert_add_seals(int fd, unsigned int seals) |
4f5ce5e8 | 111 | { |
57e67900 PK |
112 | int r; |
113 | unsigned int s; | |
4f5ce5e8 DH |
114 | |
115 | s = mfd_assert_get_seals(fd); | |
116 | r = fcntl(fd, F_ADD_SEALS, seals); | |
117 | if (r < 0) { | |
57e67900 | 118 | printf("ADD_SEALS(%d, %u -> %u) failed: %m\n", fd, s, seals); |
4f5ce5e8 DH |
119 | abort(); |
120 | } | |
121 | } | |
122 | ||
57e67900 | 123 | static void mfd_fail_add_seals(int fd, unsigned int seals) |
4f5ce5e8 | 124 | { |
57e67900 PK |
125 | int r; |
126 | unsigned int s; | |
4f5ce5e8 DH |
127 | |
128 | r = fcntl(fd, F_GET_SEALS); | |
129 | if (r < 0) | |
130 | s = 0; | |
131 | else | |
57e67900 | 132 | s = (unsigned int)r; |
4f5ce5e8 DH |
133 | |
134 | r = fcntl(fd, F_ADD_SEALS, seals); | |
135 | if (r >= 0) { | |
57e67900 PK |
136 | printf("ADD_SEALS(%d, %u -> %u) didn't fail as expected\n", |
137 | fd, s, seals); | |
4f5ce5e8 DH |
138 | abort(); |
139 | } | |
140 | } | |
141 | ||
142 | static void mfd_assert_size(int fd, size_t size) | |
143 | { | |
144 | struct stat st; | |
145 | int r; | |
146 | ||
147 | r = fstat(fd, &st); | |
148 | if (r < 0) { | |
149 | printf("fstat(%d) failed: %m\n", fd); | |
150 | abort(); | |
151 | } else if (st.st_size != size) { | |
152 | printf("wrong file size %lld, but expected %lld\n", | |
153 | (long long)st.st_size, (long long)size); | |
154 | abort(); | |
155 | } | |
156 | } | |
157 | ||
158 | static int mfd_assert_dup(int fd) | |
159 | { | |
160 | int r; | |
161 | ||
162 | r = dup(fd); | |
163 | if (r < 0) { | |
164 | printf("dup(%d) failed: %m\n", fd); | |
165 | abort(); | |
166 | } | |
167 | ||
168 | return r; | |
169 | } | |
170 | ||
171 | static void *mfd_assert_mmap_shared(int fd) | |
172 | { | |
173 | void *p; | |
174 | ||
175 | p = mmap(NULL, | |
1f522a48 | 176 | mfd_def_size, |
4f5ce5e8 DH |
177 | PROT_READ | PROT_WRITE, |
178 | MAP_SHARED, | |
179 | fd, | |
180 | 0); | |
181 | if (p == MAP_FAILED) { | |
182 | printf("mmap() failed: %m\n"); | |
183 | abort(); | |
184 | } | |
185 | ||
186 | return p; | |
187 | } | |
188 | ||
189 | static void *mfd_assert_mmap_private(int fd) | |
190 | { | |
191 | void *p; | |
192 | ||
193 | p = mmap(NULL, | |
1f522a48 | 194 | mfd_def_size, |
4f5ce5e8 DH |
195 | PROT_READ, |
196 | MAP_PRIVATE, | |
197 | fd, | |
198 | 0); | |
199 | if (p == MAP_FAILED) { | |
200 | printf("mmap() failed: %m\n"); | |
201 | abort(); | |
202 | } | |
203 | ||
204 | return p; | |
205 | } | |
206 | ||
207 | static int mfd_assert_open(int fd, int flags, mode_t mode) | |
208 | { | |
209 | char buf[512]; | |
210 | int r; | |
211 | ||
212 | sprintf(buf, "/proc/self/fd/%d", fd); | |
213 | r = open(buf, flags, mode); | |
214 | if (r < 0) { | |
215 | printf("open(%s) failed: %m\n", buf); | |
216 | abort(); | |
217 | } | |
218 | ||
219 | return r; | |
220 | } | |
221 | ||
222 | static void mfd_fail_open(int fd, int flags, mode_t mode) | |
223 | { | |
224 | char buf[512]; | |
225 | int r; | |
226 | ||
227 | sprintf(buf, "/proc/self/fd/%d", fd); | |
228 | r = open(buf, flags, mode); | |
229 | if (r >= 0) { | |
2ed36928 | 230 | printf("open(%s) didn't fail as expected\n", buf); |
4f5ce5e8 DH |
231 | abort(); |
232 | } | |
233 | } | |
234 | ||
235 | static void mfd_assert_read(int fd) | |
236 | { | |
237 | char buf[16]; | |
238 | void *p; | |
239 | ssize_t l; | |
240 | ||
241 | l = read(fd, buf, sizeof(buf)); | |
242 | if (l != sizeof(buf)) { | |
243 | printf("read() failed: %m\n"); | |
244 | abort(); | |
245 | } | |
246 | ||
247 | /* verify PROT_READ *is* allowed */ | |
248 | p = mmap(NULL, | |
1f522a48 | 249 | mfd_def_size, |
4f5ce5e8 DH |
250 | PROT_READ, |
251 | MAP_PRIVATE, | |
252 | fd, | |
253 | 0); | |
254 | if (p == MAP_FAILED) { | |
255 | printf("mmap() failed: %m\n"); | |
256 | abort(); | |
257 | } | |
1f522a48 | 258 | munmap(p, mfd_def_size); |
4f5ce5e8 DH |
259 | |
260 | /* verify MAP_PRIVATE is *always* allowed (even writable) */ | |
261 | p = mmap(NULL, | |
1f522a48 | 262 | mfd_def_size, |
4f5ce5e8 DH |
263 | PROT_READ | PROT_WRITE, |
264 | MAP_PRIVATE, | |
265 | fd, | |
266 | 0); | |
267 | if (p == MAP_FAILED) { | |
268 | printf("mmap() failed: %m\n"); | |
269 | abort(); | |
270 | } | |
1f522a48 | 271 | munmap(p, mfd_def_size); |
4f5ce5e8 DH |
272 | } |
273 | ||
54402986 JFG |
274 | /* Test that PROT_READ + MAP_SHARED mappings work. */ |
275 | static void mfd_assert_read_shared(int fd) | |
276 | { | |
277 | void *p; | |
278 | ||
279 | /* verify PROT_READ and MAP_SHARED *is* allowed */ | |
280 | p = mmap(NULL, | |
281 | mfd_def_size, | |
282 | PROT_READ, | |
283 | MAP_SHARED, | |
284 | fd, | |
285 | 0); | |
286 | if (p == MAP_FAILED) { | |
287 | printf("mmap() failed: %m\n"); | |
288 | abort(); | |
289 | } | |
290 | munmap(p, mfd_def_size); | |
291 | } | |
292 | ||
2e53c4e1 JFG |
293 | static void mfd_assert_fork_private_write(int fd) |
294 | { | |
295 | int *p; | |
296 | pid_t pid; | |
297 | ||
298 | p = mmap(NULL, | |
299 | mfd_def_size, | |
300 | PROT_READ | PROT_WRITE, | |
301 | MAP_PRIVATE, | |
302 | fd, | |
303 | 0); | |
304 | if (p == MAP_FAILED) { | |
305 | printf("mmap() failed: %m\n"); | |
306 | abort(); | |
307 | } | |
308 | ||
309 | p[0] = 22; | |
310 | ||
311 | pid = fork(); | |
312 | if (pid == 0) { | |
313 | p[0] = 33; | |
314 | exit(0); | |
315 | } else { | |
316 | waitpid(pid, NULL, 0); | |
317 | ||
318 | if (p[0] != 22) { | |
319 | printf("MAP_PRIVATE copy-on-write failed: %m\n"); | |
320 | abort(); | |
321 | } | |
322 | } | |
323 | ||
324 | munmap(p, mfd_def_size); | |
325 | } | |
326 | ||
4f5ce5e8 DH |
327 | static void mfd_assert_write(int fd) |
328 | { | |
329 | ssize_t l; | |
330 | void *p; | |
331 | int r; | |
332 | ||
1f522a48 MK |
333 | /* |
334 | * huegtlbfs does not support write, but we want to | |
335 | * verify everything else here. | |
336 | */ | |
337 | if (!hugetlbfs_test) { | |
338 | /* verify write() succeeds */ | |
339 | l = write(fd, "\0\0\0\0", 4); | |
340 | if (l != 4) { | |
341 | printf("write() failed: %m\n"); | |
342 | abort(); | |
343 | } | |
4f5ce5e8 DH |
344 | } |
345 | ||
346 | /* verify PROT_READ | PROT_WRITE is allowed */ | |
347 | p = mmap(NULL, | |
1f522a48 | 348 | mfd_def_size, |
4f5ce5e8 DH |
349 | PROT_READ | PROT_WRITE, |
350 | MAP_SHARED, | |
351 | fd, | |
352 | 0); | |
353 | if (p == MAP_FAILED) { | |
354 | printf("mmap() failed: %m\n"); | |
355 | abort(); | |
356 | } | |
357 | *(char *)p = 0; | |
1f522a48 | 358 | munmap(p, mfd_def_size); |
4f5ce5e8 DH |
359 | |
360 | /* verify PROT_WRITE is allowed */ | |
361 | p = mmap(NULL, | |
1f522a48 | 362 | mfd_def_size, |
4f5ce5e8 DH |
363 | PROT_WRITE, |
364 | MAP_SHARED, | |
365 | fd, | |
366 | 0); | |
367 | if (p == MAP_FAILED) { | |
368 | printf("mmap() failed: %m\n"); | |
369 | abort(); | |
370 | } | |
371 | *(char *)p = 0; | |
1f522a48 | 372 | munmap(p, mfd_def_size); |
4f5ce5e8 DH |
373 | |
374 | /* verify PROT_READ with MAP_SHARED is allowed and a following | |
375 | * mprotect(PROT_WRITE) allows writing */ | |
376 | p = mmap(NULL, | |
1f522a48 | 377 | mfd_def_size, |
4f5ce5e8 DH |
378 | PROT_READ, |
379 | MAP_SHARED, | |
380 | fd, | |
381 | 0); | |
382 | if (p == MAP_FAILED) { | |
383 | printf("mmap() failed: %m\n"); | |
384 | abort(); | |
385 | } | |
386 | ||
1f522a48 | 387 | r = mprotect(p, mfd_def_size, PROT_READ | PROT_WRITE); |
4f5ce5e8 DH |
388 | if (r < 0) { |
389 | printf("mprotect() failed: %m\n"); | |
390 | abort(); | |
391 | } | |
392 | ||
393 | *(char *)p = 0; | |
1f522a48 | 394 | munmap(p, mfd_def_size); |
4f5ce5e8 DH |
395 | |
396 | /* verify PUNCH_HOLE works */ | |
397 | r = fallocate(fd, | |
398 | FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, | |
399 | 0, | |
1f522a48 | 400 | mfd_def_size); |
4f5ce5e8 DH |
401 | if (r < 0) { |
402 | printf("fallocate(PUNCH_HOLE) failed: %m\n"); | |
403 | abort(); | |
404 | } | |
405 | } | |
406 | ||
407 | static void mfd_fail_write(int fd) | |
408 | { | |
409 | ssize_t l; | |
410 | void *p; | |
411 | int r; | |
412 | ||
413 | /* verify write() fails */ | |
414 | l = write(fd, "data", 4); | |
415 | if (l != -EPERM) { | |
416 | printf("expected EPERM on write(), but got %d: %m\n", (int)l); | |
417 | abort(); | |
418 | } | |
419 | ||
420 | /* verify PROT_READ | PROT_WRITE is not allowed */ | |
421 | p = mmap(NULL, | |
1f522a48 | 422 | mfd_def_size, |
4f5ce5e8 DH |
423 | PROT_READ | PROT_WRITE, |
424 | MAP_SHARED, | |
425 | fd, | |
426 | 0); | |
427 | if (p != MAP_FAILED) { | |
428 | printf("mmap() didn't fail as expected\n"); | |
429 | abort(); | |
430 | } | |
431 | ||
432 | /* verify PROT_WRITE is not allowed */ | |
433 | p = mmap(NULL, | |
1f522a48 | 434 | mfd_def_size, |
4f5ce5e8 DH |
435 | PROT_WRITE, |
436 | MAP_SHARED, | |
437 | fd, | |
438 | 0); | |
439 | if (p != MAP_FAILED) { | |
440 | printf("mmap() didn't fail as expected\n"); | |
441 | abort(); | |
442 | } | |
443 | ||
444 | /* Verify PROT_READ with MAP_SHARED with a following mprotect is not | |
445 | * allowed. Note that for r/w the kernel already prevents the mmap. */ | |
446 | p = mmap(NULL, | |
1f522a48 | 447 | mfd_def_size, |
4f5ce5e8 DH |
448 | PROT_READ, |
449 | MAP_SHARED, | |
450 | fd, | |
451 | 0); | |
452 | if (p != MAP_FAILED) { | |
1f522a48 | 453 | r = mprotect(p, mfd_def_size, PROT_READ | PROT_WRITE); |
4f5ce5e8 DH |
454 | if (r >= 0) { |
455 | printf("mmap()+mprotect() didn't fail as expected\n"); | |
456 | abort(); | |
457 | } | |
458 | } | |
459 | ||
460 | /* verify PUNCH_HOLE fails */ | |
461 | r = fallocate(fd, | |
462 | FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, | |
463 | 0, | |
1f522a48 | 464 | mfd_def_size); |
4f5ce5e8 DH |
465 | if (r >= 0) { |
466 | printf("fallocate(PUNCH_HOLE) didn't fail as expected\n"); | |
467 | abort(); | |
468 | } | |
469 | } | |
470 | ||
471 | static void mfd_assert_shrink(int fd) | |
472 | { | |
473 | int r, fd2; | |
474 | ||
1f522a48 | 475 | r = ftruncate(fd, mfd_def_size / 2); |
4f5ce5e8 DH |
476 | if (r < 0) { |
477 | printf("ftruncate(SHRINK) failed: %m\n"); | |
478 | abort(); | |
479 | } | |
480 | ||
1f522a48 | 481 | mfd_assert_size(fd, mfd_def_size / 2); |
4f5ce5e8 DH |
482 | |
483 | fd2 = mfd_assert_open(fd, | |
484 | O_RDWR | O_CREAT | O_TRUNC, | |
485 | S_IRUSR | S_IWUSR); | |
486 | close(fd2); | |
487 | ||
488 | mfd_assert_size(fd, 0); | |
489 | } | |
490 | ||
491 | static void mfd_fail_shrink(int fd) | |
492 | { | |
493 | int r; | |
494 | ||
1f522a48 | 495 | r = ftruncate(fd, mfd_def_size / 2); |
4f5ce5e8 DH |
496 | if (r >= 0) { |
497 | printf("ftruncate(SHRINK) didn't fail as expected\n"); | |
498 | abort(); | |
499 | } | |
500 | ||
501 | mfd_fail_open(fd, | |
502 | O_RDWR | O_CREAT | O_TRUNC, | |
503 | S_IRUSR | S_IWUSR); | |
504 | } | |
505 | ||
506 | static void mfd_assert_grow(int fd) | |
507 | { | |
508 | int r; | |
509 | ||
1f522a48 | 510 | r = ftruncate(fd, mfd_def_size * 2); |
4f5ce5e8 DH |
511 | if (r < 0) { |
512 | printf("ftruncate(GROW) failed: %m\n"); | |
513 | abort(); | |
514 | } | |
515 | ||
1f522a48 | 516 | mfd_assert_size(fd, mfd_def_size * 2); |
4f5ce5e8 DH |
517 | |
518 | r = fallocate(fd, | |
519 | 0, | |
520 | 0, | |
1f522a48 | 521 | mfd_def_size * 4); |
4f5ce5e8 DH |
522 | if (r < 0) { |
523 | printf("fallocate(ALLOC) failed: %m\n"); | |
524 | abort(); | |
525 | } | |
526 | ||
1f522a48 | 527 | mfd_assert_size(fd, mfd_def_size * 4); |
4f5ce5e8 DH |
528 | } |
529 | ||
530 | static void mfd_fail_grow(int fd) | |
531 | { | |
532 | int r; | |
533 | ||
1f522a48 | 534 | r = ftruncate(fd, mfd_def_size * 2); |
4f5ce5e8 DH |
535 | if (r >= 0) { |
536 | printf("ftruncate(GROW) didn't fail as expected\n"); | |
537 | abort(); | |
538 | } | |
539 | ||
540 | r = fallocate(fd, | |
541 | 0, | |
542 | 0, | |
1f522a48 | 543 | mfd_def_size * 4); |
4f5ce5e8 DH |
544 | if (r >= 0) { |
545 | printf("fallocate(ALLOC) didn't fail as expected\n"); | |
546 | abort(); | |
547 | } | |
548 | } | |
549 | ||
550 | static void mfd_assert_grow_write(int fd) | |
551 | { | |
1f522a48 | 552 | static char *buf; |
4f5ce5e8 DH |
553 | ssize_t l; |
554 | ||
72497845 MAL |
555 | /* hugetlbfs does not support write */ |
556 | if (hugetlbfs_test) | |
557 | return; | |
558 | ||
1f522a48 MK |
559 | buf = malloc(mfd_def_size * 8); |
560 | if (!buf) { | |
7d33d2b5 | 561 | printf("malloc(%zu) failed: %m\n", mfd_def_size * 8); |
1f522a48 MK |
562 | abort(); |
563 | } | |
564 | ||
565 | l = pwrite(fd, buf, mfd_def_size * 8, 0); | |
566 | if (l != (mfd_def_size * 8)) { | |
4f5ce5e8 DH |
567 | printf("pwrite() failed: %m\n"); |
568 | abort(); | |
569 | } | |
570 | ||
1f522a48 | 571 | mfd_assert_size(fd, mfd_def_size * 8); |
4f5ce5e8 DH |
572 | } |
573 | ||
574 | static void mfd_fail_grow_write(int fd) | |
575 | { | |
1f522a48 | 576 | static char *buf; |
4f5ce5e8 DH |
577 | ssize_t l; |
578 | ||
72497845 MAL |
579 | /* hugetlbfs does not support write */ |
580 | if (hugetlbfs_test) | |
581 | return; | |
582 | ||
1f522a48 MK |
583 | buf = malloc(mfd_def_size * 8); |
584 | if (!buf) { | |
7d33d2b5 | 585 | printf("malloc(%zu) failed: %m\n", mfd_def_size * 8); |
1f522a48 MK |
586 | abort(); |
587 | } | |
588 | ||
589 | l = pwrite(fd, buf, mfd_def_size * 8, 0); | |
590 | if (l == (mfd_def_size * 8)) { | |
4f5ce5e8 DH |
591 | printf("pwrite() didn't fail as expected\n"); |
592 | abort(); | |
593 | } | |
594 | } | |
595 | ||
596 | static int idle_thread_fn(void *arg) | |
597 | { | |
598 | sigset_t set; | |
599 | int sig; | |
600 | ||
601 | /* dummy waiter; SIGTERM terminates us anyway */ | |
602 | sigemptyset(&set); | |
603 | sigaddset(&set, SIGTERM); | |
604 | sigwait(&set, &sig); | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | static pid_t spawn_idle_thread(unsigned int flags) | |
610 | { | |
611 | uint8_t *stack; | |
612 | pid_t pid; | |
613 | ||
614 | stack = malloc(STACK_SIZE); | |
615 | if (!stack) { | |
616 | printf("malloc(STACK_SIZE) failed: %m\n"); | |
617 | abort(); | |
618 | } | |
619 | ||
620 | pid = clone(idle_thread_fn, | |
621 | stack + STACK_SIZE, | |
622 | SIGCHLD | flags, | |
623 | NULL); | |
624 | if (pid < 0) { | |
625 | printf("clone() failed: %m\n"); | |
626 | abort(); | |
627 | } | |
628 | ||
629 | return pid; | |
630 | } | |
631 | ||
632 | static void join_idle_thread(pid_t pid) | |
633 | { | |
634 | kill(pid, SIGTERM); | |
635 | waitpid(pid, NULL, 0); | |
636 | } | |
637 | ||
638 | /* | |
639 | * Test memfd_create() syscall | |
640 | * Verify syscall-argument validation, including name checks, flag validation | |
641 | * and more. | |
642 | */ | |
643 | static void test_create(void) | |
644 | { | |
645 | char buf[2048]; | |
646 | int fd; | |
647 | ||
3037aeb9 | 648 | printf("%s CREATE\n", memfd_str); |
1f522a48 | 649 | |
4f5ce5e8 DH |
650 | /* test NULL name */ |
651 | mfd_fail_new(NULL, 0); | |
652 | ||
653 | /* test over-long name (not zero-terminated) */ | |
654 | memset(buf, 0xff, sizeof(buf)); | |
655 | mfd_fail_new(buf, 0); | |
656 | ||
657 | /* test over-long zero-terminated name */ | |
658 | memset(buf, 0xff, sizeof(buf)); | |
659 | buf[sizeof(buf) - 1] = 0; | |
660 | mfd_fail_new(buf, 0); | |
661 | ||
662 | /* verify "" is a valid name */ | |
663 | fd = mfd_assert_new("", 0, 0); | |
664 | close(fd); | |
665 | ||
666 | /* verify invalid O_* open flags */ | |
667 | mfd_fail_new("", 0x0100); | |
668 | mfd_fail_new("", ~MFD_CLOEXEC); | |
669 | mfd_fail_new("", ~MFD_ALLOW_SEALING); | |
670 | mfd_fail_new("", ~0); | |
671 | mfd_fail_new("", 0x80000000U); | |
672 | ||
673 | /* verify MFD_CLOEXEC is allowed */ | |
674 | fd = mfd_assert_new("", 0, MFD_CLOEXEC); | |
675 | close(fd); | |
676 | ||
72497845 MAL |
677 | /* verify MFD_ALLOW_SEALING is allowed */ |
678 | fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING); | |
679 | close(fd); | |
680 | ||
681 | /* verify MFD_ALLOW_SEALING | MFD_CLOEXEC is allowed */ | |
682 | fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING | MFD_CLOEXEC); | |
683 | close(fd); | |
4f5ce5e8 DH |
684 | } |
685 | ||
686 | /* | |
687 | * Test basic sealing | |
688 | * A very basic sealing test to see whether setting/retrieving seals works. | |
689 | */ | |
690 | static void test_basic(void) | |
691 | { | |
692 | int fd; | |
693 | ||
3037aeb9 | 694 | printf("%s BASIC\n", memfd_str); |
1f522a48 | 695 | |
4f5ce5e8 | 696 | fd = mfd_assert_new("kern_memfd_basic", |
1f522a48 | 697 | mfd_def_size, |
4f5ce5e8 DH |
698 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
699 | ||
700 | /* add basic seals */ | |
701 | mfd_assert_has_seals(fd, 0); | |
702 | mfd_assert_add_seals(fd, F_SEAL_SHRINK | | |
703 | F_SEAL_WRITE); | |
704 | mfd_assert_has_seals(fd, F_SEAL_SHRINK | | |
705 | F_SEAL_WRITE); | |
706 | ||
707 | /* add them again */ | |
708 | mfd_assert_add_seals(fd, F_SEAL_SHRINK | | |
709 | F_SEAL_WRITE); | |
710 | mfd_assert_has_seals(fd, F_SEAL_SHRINK | | |
711 | F_SEAL_WRITE); | |
712 | ||
713 | /* add more seals and seal against sealing */ | |
714 | mfd_assert_add_seals(fd, F_SEAL_GROW | F_SEAL_SEAL); | |
715 | mfd_assert_has_seals(fd, F_SEAL_SHRINK | | |
716 | F_SEAL_GROW | | |
717 | F_SEAL_WRITE | | |
718 | F_SEAL_SEAL); | |
719 | ||
720 | /* verify that sealing no longer works */ | |
721 | mfd_fail_add_seals(fd, F_SEAL_GROW); | |
722 | mfd_fail_add_seals(fd, 0); | |
723 | ||
724 | close(fd); | |
725 | ||
726 | /* verify sealing does not work without MFD_ALLOW_SEALING */ | |
727 | fd = mfd_assert_new("kern_memfd_basic", | |
1f522a48 | 728 | mfd_def_size, |
4f5ce5e8 DH |
729 | MFD_CLOEXEC); |
730 | mfd_assert_has_seals(fd, F_SEAL_SEAL); | |
731 | mfd_fail_add_seals(fd, F_SEAL_SHRINK | | |
732 | F_SEAL_GROW | | |
733 | F_SEAL_WRITE); | |
734 | mfd_assert_has_seals(fd, F_SEAL_SEAL); | |
735 | close(fd); | |
736 | } | |
737 | ||
738 | /* | |
739 | * Test SEAL_WRITE | |
740 | * Test whether SEAL_WRITE actually prevents modifications. | |
741 | */ | |
742 | static void test_seal_write(void) | |
743 | { | |
744 | int fd; | |
745 | ||
3037aeb9 | 746 | printf("%s SEAL-WRITE\n", memfd_str); |
1f522a48 | 747 | |
4f5ce5e8 | 748 | fd = mfd_assert_new("kern_memfd_seal_write", |
1f522a48 | 749 | mfd_def_size, |
4f5ce5e8 DH |
750 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
751 | mfd_assert_has_seals(fd, 0); | |
752 | mfd_assert_add_seals(fd, F_SEAL_WRITE); | |
753 | mfd_assert_has_seals(fd, F_SEAL_WRITE); | |
754 | ||
755 | mfd_assert_read(fd); | |
756 | mfd_fail_write(fd); | |
757 | mfd_assert_shrink(fd); | |
758 | mfd_assert_grow(fd); | |
759 | mfd_fail_grow_write(fd); | |
760 | ||
761 | close(fd); | |
762 | } | |
763 | ||
54402986 JFG |
764 | /* |
765 | * Test SEAL_FUTURE_WRITE | |
766 | * Test whether SEAL_FUTURE_WRITE actually prevents modifications. | |
767 | */ | |
768 | static void test_seal_future_write(void) | |
769 | { | |
770 | int fd, fd2; | |
771 | void *p; | |
772 | ||
773 | printf("%s SEAL-FUTURE-WRITE\n", memfd_str); | |
774 | ||
775 | fd = mfd_assert_new("kern_memfd_seal_future_write", | |
776 | mfd_def_size, | |
777 | MFD_CLOEXEC | MFD_ALLOW_SEALING); | |
778 | ||
779 | p = mfd_assert_mmap_shared(fd); | |
780 | ||
781 | mfd_assert_has_seals(fd, 0); | |
782 | ||
783 | mfd_assert_add_seals(fd, F_SEAL_FUTURE_WRITE); | |
784 | mfd_assert_has_seals(fd, F_SEAL_FUTURE_WRITE); | |
785 | ||
786 | /* read should pass, writes should fail */ | |
787 | mfd_assert_read(fd); | |
788 | mfd_assert_read_shared(fd); | |
789 | mfd_fail_write(fd); | |
790 | ||
791 | fd2 = mfd_assert_reopen_fd(fd); | |
792 | /* read should pass, writes should still fail */ | |
793 | mfd_assert_read(fd2); | |
794 | mfd_assert_read_shared(fd2); | |
795 | mfd_fail_write(fd2); | |
796 | ||
2e53c4e1 JFG |
797 | mfd_assert_fork_private_write(fd); |
798 | ||
54402986 JFG |
799 | munmap(p, mfd_def_size); |
800 | close(fd2); | |
801 | close(fd); | |
802 | } | |
803 | ||
4f5ce5e8 DH |
804 | /* |
805 | * Test SEAL_SHRINK | |
806 | * Test whether SEAL_SHRINK actually prevents shrinking | |
807 | */ | |
808 | static void test_seal_shrink(void) | |
809 | { | |
810 | int fd; | |
811 | ||
3037aeb9 | 812 | printf("%s SEAL-SHRINK\n", memfd_str); |
1f522a48 | 813 | |
4f5ce5e8 | 814 | fd = mfd_assert_new("kern_memfd_seal_shrink", |
1f522a48 | 815 | mfd_def_size, |
4f5ce5e8 DH |
816 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
817 | mfd_assert_has_seals(fd, 0); | |
818 | mfd_assert_add_seals(fd, F_SEAL_SHRINK); | |
819 | mfd_assert_has_seals(fd, F_SEAL_SHRINK); | |
820 | ||
821 | mfd_assert_read(fd); | |
822 | mfd_assert_write(fd); | |
823 | mfd_fail_shrink(fd); | |
824 | mfd_assert_grow(fd); | |
825 | mfd_assert_grow_write(fd); | |
826 | ||
827 | close(fd); | |
828 | } | |
829 | ||
830 | /* | |
831 | * Test SEAL_GROW | |
832 | * Test whether SEAL_GROW actually prevents growing | |
833 | */ | |
834 | static void test_seal_grow(void) | |
835 | { | |
836 | int fd; | |
837 | ||
3037aeb9 | 838 | printf("%s SEAL-GROW\n", memfd_str); |
1f522a48 | 839 | |
4f5ce5e8 | 840 | fd = mfd_assert_new("kern_memfd_seal_grow", |
1f522a48 | 841 | mfd_def_size, |
4f5ce5e8 DH |
842 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
843 | mfd_assert_has_seals(fd, 0); | |
844 | mfd_assert_add_seals(fd, F_SEAL_GROW); | |
845 | mfd_assert_has_seals(fd, F_SEAL_GROW); | |
846 | ||
847 | mfd_assert_read(fd); | |
848 | mfd_assert_write(fd); | |
849 | mfd_assert_shrink(fd); | |
850 | mfd_fail_grow(fd); | |
851 | mfd_fail_grow_write(fd); | |
852 | ||
853 | close(fd); | |
854 | } | |
855 | ||
856 | /* | |
857 | * Test SEAL_SHRINK | SEAL_GROW | |
858 | * Test whether SEAL_SHRINK | SEAL_GROW actually prevents resizing | |
859 | */ | |
860 | static void test_seal_resize(void) | |
861 | { | |
862 | int fd; | |
863 | ||
3037aeb9 | 864 | printf("%s SEAL-RESIZE\n", memfd_str); |
1f522a48 | 865 | |
4f5ce5e8 | 866 | fd = mfd_assert_new("kern_memfd_seal_resize", |
1f522a48 | 867 | mfd_def_size, |
4f5ce5e8 DH |
868 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
869 | mfd_assert_has_seals(fd, 0); | |
870 | mfd_assert_add_seals(fd, F_SEAL_SHRINK | F_SEAL_GROW); | |
871 | mfd_assert_has_seals(fd, F_SEAL_SHRINK | F_SEAL_GROW); | |
872 | ||
873 | mfd_assert_read(fd); | |
874 | mfd_assert_write(fd); | |
875 | mfd_fail_shrink(fd); | |
876 | mfd_fail_grow(fd); | |
877 | mfd_fail_grow_write(fd); | |
878 | ||
879 | close(fd); | |
880 | } | |
881 | ||
882 | /* | |
883 | * Test sharing via dup() | |
884 | * Test that seals are shared between dupped FDs and they're all equal. | |
885 | */ | |
1f522a48 | 886 | static void test_share_dup(char *banner, char *b_suffix) |
4f5ce5e8 DH |
887 | { |
888 | int fd, fd2; | |
889 | ||
3037aeb9 | 890 | printf("%s %s %s\n", memfd_str, banner, b_suffix); |
1f522a48 | 891 | |
4f5ce5e8 | 892 | fd = mfd_assert_new("kern_memfd_share_dup", |
1f522a48 | 893 | mfd_def_size, |
4f5ce5e8 DH |
894 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
895 | mfd_assert_has_seals(fd, 0); | |
896 | ||
897 | fd2 = mfd_assert_dup(fd); | |
898 | mfd_assert_has_seals(fd2, 0); | |
899 | ||
900 | mfd_assert_add_seals(fd, F_SEAL_WRITE); | |
901 | mfd_assert_has_seals(fd, F_SEAL_WRITE); | |
902 | mfd_assert_has_seals(fd2, F_SEAL_WRITE); | |
903 | ||
904 | mfd_assert_add_seals(fd2, F_SEAL_SHRINK); | |
905 | mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK); | |
906 | mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK); | |
907 | ||
908 | mfd_assert_add_seals(fd, F_SEAL_SEAL); | |
909 | mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL); | |
910 | mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL); | |
911 | ||
912 | mfd_fail_add_seals(fd, F_SEAL_GROW); | |
913 | mfd_fail_add_seals(fd2, F_SEAL_GROW); | |
914 | mfd_fail_add_seals(fd, F_SEAL_SEAL); | |
915 | mfd_fail_add_seals(fd2, F_SEAL_SEAL); | |
916 | ||
917 | close(fd2); | |
918 | ||
919 | mfd_fail_add_seals(fd, F_SEAL_GROW); | |
920 | close(fd); | |
921 | } | |
922 | ||
923 | /* | |
924 | * Test sealing with active mmap()s | |
925 | * Modifying seals is only allowed if no other mmap() refs exist. | |
926 | */ | |
1f522a48 | 927 | static void test_share_mmap(char *banner, char *b_suffix) |
4f5ce5e8 DH |
928 | { |
929 | int fd; | |
930 | void *p; | |
931 | ||
3037aeb9 | 932 | printf("%s %s %s\n", memfd_str, banner, b_suffix); |
1f522a48 | 933 | |
4f5ce5e8 | 934 | fd = mfd_assert_new("kern_memfd_share_mmap", |
1f522a48 | 935 | mfd_def_size, |
4f5ce5e8 DH |
936 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
937 | mfd_assert_has_seals(fd, 0); | |
938 | ||
939 | /* shared/writable ref prevents sealing WRITE, but allows others */ | |
940 | p = mfd_assert_mmap_shared(fd); | |
941 | mfd_fail_add_seals(fd, F_SEAL_WRITE); | |
942 | mfd_assert_has_seals(fd, 0); | |
943 | mfd_assert_add_seals(fd, F_SEAL_SHRINK); | |
944 | mfd_assert_has_seals(fd, F_SEAL_SHRINK); | |
1f522a48 | 945 | munmap(p, mfd_def_size); |
4f5ce5e8 DH |
946 | |
947 | /* readable ref allows sealing */ | |
948 | p = mfd_assert_mmap_private(fd); | |
949 | mfd_assert_add_seals(fd, F_SEAL_WRITE); | |
950 | mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK); | |
1f522a48 MK |
951 | munmap(p, mfd_def_size); |
952 | ||
953 | close(fd); | |
954 | } | |
955 | ||
4f5ce5e8 DH |
956 | /* |
957 | * Test sealing with open(/proc/self/fd/%d) | |
958 | * Via /proc we can get access to a separate file-context for the same memfd. | |
959 | * This is *not* like dup(), but like a real separate open(). Make sure the | |
960 | * semantics are as expected and we correctly check for RDONLY / WRONLY / RDWR. | |
961 | */ | |
1f522a48 | 962 | static void test_share_open(char *banner, char *b_suffix) |
4f5ce5e8 DH |
963 | { |
964 | int fd, fd2; | |
965 | ||
3037aeb9 | 966 | printf("%s %s %s\n", memfd_str, banner, b_suffix); |
1f522a48 | 967 | |
4f5ce5e8 | 968 | fd = mfd_assert_new("kern_memfd_share_open", |
1f522a48 | 969 | mfd_def_size, |
4f5ce5e8 DH |
970 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
971 | mfd_assert_has_seals(fd, 0); | |
972 | ||
973 | fd2 = mfd_assert_open(fd, O_RDWR, 0); | |
974 | mfd_assert_add_seals(fd, F_SEAL_WRITE); | |
975 | mfd_assert_has_seals(fd, F_SEAL_WRITE); | |
976 | mfd_assert_has_seals(fd2, F_SEAL_WRITE); | |
977 | ||
978 | mfd_assert_add_seals(fd2, F_SEAL_SHRINK); | |
979 | mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK); | |
980 | mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK); | |
981 | ||
982 | close(fd); | |
983 | fd = mfd_assert_open(fd2, O_RDONLY, 0); | |
984 | ||
985 | mfd_fail_add_seals(fd, F_SEAL_SEAL); | |
986 | mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK); | |
987 | mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK); | |
988 | ||
989 | close(fd2); | |
990 | fd2 = mfd_assert_open(fd, O_RDWR, 0); | |
991 | ||
992 | mfd_assert_add_seals(fd2, F_SEAL_SEAL); | |
993 | mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL); | |
994 | mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL); | |
995 | ||
996 | close(fd2); | |
997 | close(fd); | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * Test sharing via fork() | |
1002 | * Test whether seal-modifications work as expected with forked childs. | |
1003 | */ | |
1f522a48 | 1004 | static void test_share_fork(char *banner, char *b_suffix) |
4f5ce5e8 DH |
1005 | { |
1006 | int fd; | |
1007 | pid_t pid; | |
1008 | ||
3037aeb9 | 1009 | printf("%s %s %s\n", memfd_str, banner, b_suffix); |
1f522a48 | 1010 | |
4f5ce5e8 | 1011 | fd = mfd_assert_new("kern_memfd_share_fork", |
1f522a48 | 1012 | mfd_def_size, |
4f5ce5e8 DH |
1013 | MFD_CLOEXEC | MFD_ALLOW_SEALING); |
1014 | mfd_assert_has_seals(fd, 0); | |
1015 | ||
1016 | pid = spawn_idle_thread(0); | |
1017 | mfd_assert_add_seals(fd, F_SEAL_SEAL); | |
1018 | mfd_assert_has_seals(fd, F_SEAL_SEAL); | |
1019 | ||
1020 | mfd_fail_add_seals(fd, F_SEAL_WRITE); | |
1021 | mfd_assert_has_seals(fd, F_SEAL_SEAL); | |
1022 | ||
1023 | join_idle_thread(pid); | |
1024 | ||
1025 | mfd_fail_add_seals(fd, F_SEAL_WRITE); | |
1026 | mfd_assert_has_seals(fd, F_SEAL_SEAL); | |
1027 | ||
1028 | close(fd); | |
1029 | } | |
1030 | ||
1031 | int main(int argc, char **argv) | |
1032 | { | |
1033 | pid_t pid; | |
1034 | ||
1f522a48 MK |
1035 | if (argc == 2) { |
1036 | if (!strcmp(argv[1], "hugetlbfs")) { | |
1037 | unsigned long hpage_size = default_huge_page_size(); | |
1038 | ||
1039 | if (!hpage_size) { | |
1040 | printf("Unable to determine huge page size\n"); | |
1041 | abort(); | |
1042 | } | |
1043 | ||
1044 | hugetlbfs_test = 1; | |
3037aeb9 | 1045 | memfd_str = MEMFD_HUGE_STR; |
1f522a48 | 1046 | mfd_def_size = hpage_size * 2; |
3037aeb9 MAL |
1047 | } else { |
1048 | printf("Unknown option: %s\n", argv[1]); | |
1049 | abort(); | |
1f522a48 MK |
1050 | } |
1051 | } | |
1052 | ||
4f5ce5e8 | 1053 | test_create(); |
4f5ce5e8 DH |
1054 | test_basic(); |
1055 | ||
4f5ce5e8 | 1056 | test_seal_write(); |
54402986 | 1057 | test_seal_future_write(); |
4f5ce5e8 | 1058 | test_seal_shrink(); |
4f5ce5e8 | 1059 | test_seal_grow(); |
4f5ce5e8 DH |
1060 | test_seal_resize(); |
1061 | ||
1f522a48 MK |
1062 | test_share_dup("SHARE-DUP", ""); |
1063 | test_share_mmap("SHARE-MMAP", ""); | |
1064 | test_share_open("SHARE-OPEN", ""); | |
1065 | test_share_fork("SHARE-FORK", ""); | |
4f5ce5e8 DH |
1066 | |
1067 | /* Run test-suite in a multi-threaded environment with a shared | |
1068 | * file-table. */ | |
1069 | pid = spawn_idle_thread(CLONE_FILES | CLONE_FS | CLONE_VM); | |
1f522a48 MK |
1070 | test_share_dup("SHARE-DUP", SHARED_FT_STR); |
1071 | test_share_mmap("SHARE-MMAP", SHARED_FT_STR); | |
1072 | test_share_open("SHARE-OPEN", SHARED_FT_STR); | |
1073 | test_share_fork("SHARE-FORK", SHARED_FT_STR); | |
4f5ce5e8 DH |
1074 | join_idle_thread(pid); |
1075 | ||
1076 | printf("memfd: DONE\n"); | |
1077 | ||
1078 | return 0; | |
1079 | } |