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73572984 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/kernel.h> | |
3 | #include <linux/errno.h> | |
4 | #include <linux/fs.h> | |
5 | #include <linux/file.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/slab.h> | |
8 | #include <linux/nospec.h> | |
9 | #include <linux/hugetlb.h> | |
10 | #include <linux/compat.h> | |
11 | #include <linux/io_uring.h> | |
12 | ||
13 | #include <uapi/linux/io_uring.h> | |
14 | ||
73572984 | 15 | #include "io_uring.h" |
414d0f45 | 16 | #include "alloc_cache.h" |
73572984 JA |
17 | #include "openclose.h" |
18 | #include "rsrc.h" | |
f15ed8b4 | 19 | #include "memmap.h" |
73572984 JA |
20 | |
21 | struct io_rsrc_update { | |
22 | struct file *file; | |
23 | u64 arg; | |
24 | u32 nr_args; | |
25 | u32 offset; | |
26 | }; | |
27 | ||
fc7f3a8d | 28 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
73572984 JA |
29 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
30 | struct io_mapped_ubuf **pimu, | |
31 | struct page **last_hpage); | |
32 | ||
73572984 JA |
33 | /* only define max */ |
34 | #define IORING_MAX_FIXED_FILES (1U << 20) | |
35 | #define IORING_MAX_REG_BUFFERS (1U << 14) | |
36 | ||
19a63c40 PB |
37 | static const struct io_mapped_ubuf dummy_ubuf = { |
38 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
39 | .ubuf = -1UL, | |
40 | .ubuf_end = 0, | |
41 | }; | |
42 | ||
6a9ce66f | 43 | int __io_account_mem(struct user_struct *user, unsigned long nr_pages) |
73572984 JA |
44 | { |
45 | unsigned long page_limit, cur_pages, new_pages; | |
46 | ||
6a9ce66f PB |
47 | if (!nr_pages) |
48 | return 0; | |
49 | ||
73572984 JA |
50 | /* Don't allow more pages than we can safely lock */ |
51 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
52 | ||
4ccc6db0 | 53 | cur_pages = atomic_long_read(&user->locked_vm); |
73572984 | 54 | do { |
73572984 JA |
55 | new_pages = cur_pages + nr_pages; |
56 | if (new_pages > page_limit) | |
57 | return -ENOMEM; | |
4ccc6db0 UB |
58 | } while (!atomic_long_try_cmpxchg(&user->locked_vm, |
59 | &cur_pages, new_pages)); | |
73572984 JA |
60 | return 0; |
61 | } | |
62 | ||
63 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) | |
64 | { | |
65 | if (ctx->user) | |
66 | __io_unaccount_mem(ctx->user, nr_pages); | |
67 | ||
68 | if (ctx->mm_account) | |
69 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
70 | } | |
71 | ||
72 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) | |
73 | { | |
74 | int ret; | |
75 | ||
76 | if (ctx->user) { | |
77 | ret = __io_account_mem(ctx->user, nr_pages); | |
78 | if (ret) | |
79 | return ret; | |
80 | } | |
81 | ||
82 | if (ctx->mm_account) | |
83 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
89 | void __user *arg, unsigned index) | |
90 | { | |
91 | struct iovec __user *src; | |
92 | ||
93 | #ifdef CONFIG_COMPAT | |
94 | if (ctx->compat) { | |
95 | struct compat_iovec __user *ciovs; | |
96 | struct compat_iovec ciov; | |
97 | ||
98 | ciovs = (struct compat_iovec __user *) arg; | |
99 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
100 | return -EFAULT; | |
101 | ||
102 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); | |
103 | dst->iov_len = ciov.iov_len; | |
104 | return 0; | |
105 | } | |
106 | #endif | |
107 | src = (struct iovec __user *) arg; | |
108 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
109 | return -EFAULT; | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static int io_buffer_validate(struct iovec *iov) | |
114 | { | |
115 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); | |
116 | ||
117 | /* | |
118 | * Don't impose further limits on the size and buffer | |
119 | * constraints here, we'll -EINVAL later when IO is | |
120 | * submitted if they are wrong. | |
121 | */ | |
122 | if (!iov->iov_base) | |
123 | return iov->iov_len ? -EFAULT : 0; | |
124 | if (!iov->iov_len) | |
125 | return -EFAULT; | |
126 | ||
127 | /* arbitrary limit, but we need something */ | |
128 | if (iov->iov_len > SZ_1G) | |
129 | return -EFAULT; | |
130 | ||
131 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) | |
132 | return -EOVERFLOW; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) | |
138 | { | |
139 | struct io_mapped_ubuf *imu = *slot; | |
140 | unsigned int i; | |
141 | ||
19a63c40 | 142 | if (imu != &dummy_ubuf) { |
73572984 JA |
143 | for (i = 0; i < imu->nr_bvecs; i++) |
144 | unpin_user_page(imu->bvec[i].bv_page); | |
145 | if (imu->acct_pages) | |
146 | io_unaccount_mem(ctx, imu->acct_pages); | |
147 | kvfree(imu); | |
148 | } | |
149 | *slot = NULL; | |
150 | } | |
151 | ||
29b26c55 | 152 | static void io_rsrc_put_work(struct io_rsrc_node *node) |
ff7c75ec | 153 | { |
29b26c55 | 154 | struct io_rsrc_put *prsrc = &node->item; |
ff7c75ec | 155 | |
36b9818a | 156 | if (prsrc->tag) |
2236b390 | 157 | io_post_aux_cqe(node->ctx, prsrc->tag, 0, 0); |
fc7f3a8d | 158 | |
2236b390 | 159 | switch (node->type) { |
fc7f3a8d | 160 | case IORING_RSRC_FILE: |
6e5e6d27 | 161 | fput(prsrc->file); |
fc7f3a8d PB |
162 | break; |
163 | case IORING_RSRC_BUFFER: | |
2236b390 | 164 | io_rsrc_buf_put(node->ctx, prsrc); |
fc7f3a8d PB |
165 | break; |
166 | default: | |
167 | WARN_ON_ONCE(1); | |
168 | break; | |
169 | } | |
ff7c75ec PB |
170 | } |
171 | ||
9eae8655 | 172 | void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *node) |
73572984 | 173 | { |
414d0f45 | 174 | if (!io_alloc_cache_put(&ctx->rsrc_node_cache, node)) |
9eae8655 | 175 | kfree(node); |
73572984 JA |
176 | } |
177 | ||
ef8ae64f | 178 | void io_rsrc_node_ref_zero(struct io_rsrc_node *node) |
2236b390 | 179 | __must_hold(&node->ctx->uring_lock) |
73572984 | 180 | { |
2236b390 | 181 | struct io_ring_ctx *ctx = node->ctx; |
73572984 | 182 | |
73572984 JA |
183 | while (!list_empty(&ctx->rsrc_ref_list)) { |
184 | node = list_first_entry(&ctx->rsrc_ref_list, | |
185 | struct io_rsrc_node, node); | |
186 | /* recycle ref nodes in order */ | |
c732ea24 | 187 | if (node->refs) |
73572984 | 188 | break; |
36b9818a | 189 | list_del(&node->node); |
4130b499 PB |
190 | |
191 | if (likely(!node->empty)) | |
29b26c55 | 192 | io_rsrc_put_work(node); |
4130b499 | 193 | io_rsrc_node_destroy(ctx, node); |
d34b1b0b | 194 | } |
0b222eeb PB |
195 | if (list_empty(&ctx->rsrc_ref_list) && unlikely(ctx->rsrc_quiesce)) |
196 | wake_up_all(&ctx->rsrc_quiesce_wq); | |
73572984 JA |
197 | } |
198 | ||
2933ae6e | 199 | struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) |
73572984 JA |
200 | { |
201 | struct io_rsrc_node *ref_node; | |
9eae8655 | 202 | |
414d0f45 JA |
203 | ref_node = io_alloc_cache_get(&ctx->rsrc_node_cache); |
204 | if (!ref_node) { | |
9eae8655 PB |
205 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
206 | if (!ref_node) | |
207 | return NULL; | |
208 | } | |
73572984 | 209 | |
2236b390 | 210 | ref_node->ctx = ctx; |
26147da3 | 211 | ref_node->empty = 0; |
c376644f | 212 | ref_node->refs = 1; |
73572984 JA |
213 | return ref_node; |
214 | } | |
215 | ||
73572984 JA |
216 | __cold static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
217 | struct io_ring_ctx *ctx) | |
218 | { | |
c376644f | 219 | struct io_rsrc_node *backup; |
4ea15b56 | 220 | DEFINE_WAIT(we); |
73572984 JA |
221 | int ret; |
222 | ||
c376644f | 223 | /* As We may drop ->uring_lock, other task may have started quiesce */ |
73572984 JA |
224 | if (data->quiesce) |
225 | return -ENXIO; | |
c376644f PB |
226 | |
227 | backup = io_rsrc_node_alloc(ctx); | |
228 | if (!backup) | |
229 | return -ENOMEM; | |
26147da3 | 230 | ctx->rsrc_node->empty = true; |
2236b390 | 231 | ctx->rsrc_node->type = -1; |
c376644f PB |
232 | list_add_tail(&ctx->rsrc_node->node, &ctx->rsrc_ref_list); |
233 | io_put_rsrc_node(ctx, ctx->rsrc_node); | |
234 | ctx->rsrc_node = backup; | |
77e3202a | 235 | |
0b222eeb | 236 | if (list_empty(&ctx->rsrc_ref_list)) |
77e3202a | 237 | return 0; |
73572984 | 238 | |
7d481e03 PB |
239 | if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) { |
240 | atomic_set(&ctx->cq_wait_nr, 1); | |
241 | smp_mb(); | |
242 | } | |
243 | ||
0b222eeb | 244 | ctx->rsrc_quiesce++; |
73572984 JA |
245 | data->quiesce = true; |
246 | do { | |
4ea15b56 | 247 | prepare_to_wait(&ctx->rsrc_quiesce_wq, &we, TASK_INTERRUPTIBLE); |
eef81fca | 248 | mutex_unlock(&ctx->uring_lock); |
4ea15b56 | 249 | |
ef67fcb4 | 250 | ret = io_run_task_work_sig(ctx); |
77e3202a | 251 | if (ret < 0) { |
77e3202a | 252 | mutex_lock(&ctx->uring_lock); |
0b222eeb | 253 | if (list_empty(&ctx->rsrc_ref_list)) |
757ef468 | 254 | ret = 0; |
77e3202a PB |
255 | break; |
256 | } | |
4ea15b56 PB |
257 | |
258 | schedule(); | |
259 | __set_current_state(TASK_RUNNING); | |
eef81fca PB |
260 | mutex_lock(&ctx->uring_lock); |
261 | ret = 0; | |
0b222eeb | 262 | } while (!list_empty(&ctx->rsrc_ref_list)); |
73572984 | 263 | |
4ea15b56 PB |
264 | finish_wait(&ctx->rsrc_quiesce_wq, &we); |
265 | data->quiesce = false; | |
0b222eeb PB |
266 | ctx->rsrc_quiesce--; |
267 | ||
7d481e03 PB |
268 | if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) { |
269 | atomic_set(&ctx->cq_wait_nr, 0); | |
270 | smp_mb(); | |
271 | } | |
73572984 JA |
272 | return ret; |
273 | } | |
274 | ||
275 | static void io_free_page_table(void **table, size_t size) | |
276 | { | |
277 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
278 | ||
279 | for (i = 0; i < nr_tables; i++) | |
280 | kfree(table[i]); | |
281 | kfree(table); | |
282 | } | |
283 | ||
284 | static void io_rsrc_data_free(struct io_rsrc_data *data) | |
285 | { | |
286 | size_t size = data->nr * sizeof(data->tags[0][0]); | |
287 | ||
288 | if (data->tags) | |
289 | io_free_page_table((void **)data->tags, size); | |
290 | kfree(data); | |
291 | } | |
292 | ||
293 | static __cold void **io_alloc_page_table(size_t size) | |
294 | { | |
295 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
296 | size_t init_size = size; | |
297 | void **table; | |
298 | ||
299 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); | |
300 | if (!table) | |
301 | return NULL; | |
302 | ||
303 | for (i = 0; i < nr_tables; i++) { | |
304 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); | |
305 | ||
306 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); | |
307 | if (!table[i]) { | |
308 | io_free_page_table(table, init_size); | |
309 | return NULL; | |
310 | } | |
311 | size -= this_size; | |
312 | } | |
313 | return table; | |
314 | } | |
315 | ||
fc7f3a8d PB |
316 | __cold static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, int type, |
317 | u64 __user *utags, | |
73572984 JA |
318 | unsigned nr, struct io_rsrc_data **pdata) |
319 | { | |
320 | struct io_rsrc_data *data; | |
6acd352d | 321 | int ret = 0; |
73572984 JA |
322 | unsigned i; |
323 | ||
324 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
325 | if (!data) | |
326 | return -ENOMEM; | |
327 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); | |
328 | if (!data->tags) { | |
329 | kfree(data); | |
330 | return -ENOMEM; | |
331 | } | |
332 | ||
333 | data->nr = nr; | |
334 | data->ctx = ctx; | |
fc7f3a8d | 335 | data->rsrc_type = type; |
73572984 JA |
336 | if (utags) { |
337 | ret = -EFAULT; | |
338 | for (i = 0; i < nr; i++) { | |
339 | u64 *tag_slot = io_get_tag_slot(data, i); | |
340 | ||
341 | if (copy_from_user(tag_slot, &utags[i], | |
342 | sizeof(*tag_slot))) | |
343 | goto fail; | |
344 | } | |
345 | } | |
73572984 JA |
346 | *pdata = data; |
347 | return 0; | |
348 | fail: | |
349 | io_rsrc_data_free(data); | |
350 | return ret; | |
351 | } | |
352 | ||
353 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
354 | struct io_uring_rsrc_update2 *up, | |
355 | unsigned nr_args) | |
356 | { | |
357 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
358 | __s32 __user *fds = u64_to_user_ptr(up->data); | |
359 | struct io_rsrc_data *data = ctx->file_data; | |
360 | struct io_fixed_file *file_slot; | |
73572984 JA |
361 | int fd, i, err = 0; |
362 | unsigned int done; | |
73572984 JA |
363 | |
364 | if (!ctx->file_data) | |
365 | return -ENXIO; | |
366 | if (up->offset + nr_args > ctx->nr_user_files) | |
367 | return -EINVAL; | |
368 | ||
369 | for (done = 0; done < nr_args; done++) { | |
370 | u64 tag = 0; | |
371 | ||
372 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
373 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
374 | err = -EFAULT; | |
375 | break; | |
376 | } | |
377 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { | |
378 | err = -EINVAL; | |
379 | break; | |
380 | } | |
381 | if (fd == IORING_REGISTER_FILES_SKIP) | |
382 | continue; | |
383 | ||
384 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); | |
385 | file_slot = io_fixed_file_slot(&ctx->file_table, i); | |
386 | ||
387 | if (file_slot->file_ptr) { | |
4bfb0c9a CH |
388 | err = io_queue_rsrc_removal(data, i, |
389 | io_slot_file(file_slot)); | |
73572984 JA |
390 | if (err) |
391 | break; | |
392 | file_slot->file_ptr = 0; | |
393 | io_file_bitmap_clear(&ctx->file_table, i); | |
73572984 JA |
394 | } |
395 | if (fd != -1) { | |
4bfb0c9a CH |
396 | struct file *file = fget(fd); |
397 | ||
73572984 JA |
398 | if (!file) { |
399 | err = -EBADF; | |
400 | break; | |
401 | } | |
402 | /* | |
6e5e6d27 | 403 | * Don't allow io_uring instances to be registered. |
73572984 JA |
404 | */ |
405 | if (io_is_uring_fops(file)) { | |
406 | fput(file); | |
407 | err = -EBADF; | |
408 | break; | |
409 | } | |
73572984 JA |
410 | *io_get_tag_slot(data, i) = tag; |
411 | io_fixed_file_set(file_slot, file); | |
412 | io_file_bitmap_set(&ctx->file_table, i); | |
413 | } | |
414 | } | |
73572984 JA |
415 | return done ? done : err; |
416 | } | |
417 | ||
418 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, | |
419 | struct io_uring_rsrc_update2 *up, | |
420 | unsigned int nr_args) | |
421 | { | |
422 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
423 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
424 | struct page *last_hpage = NULL; | |
73572984 JA |
425 | __u32 done; |
426 | int i, err; | |
427 | ||
428 | if (!ctx->buf_data) | |
429 | return -ENXIO; | |
430 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
431 | return -EINVAL; | |
432 | ||
433 | for (done = 0; done < nr_args; done++) { | |
434 | struct io_mapped_ubuf *imu; | |
73572984 JA |
435 | u64 tag = 0; |
436 | ||
437 | err = io_copy_iov(ctx, &iov, iovs, done); | |
438 | if (err) | |
439 | break; | |
440 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
441 | err = -EFAULT; | |
442 | break; | |
443 | } | |
444 | err = io_buffer_validate(&iov); | |
445 | if (err) | |
446 | break; | |
447 | if (!iov.iov_base && tag) { | |
448 | err = -EINVAL; | |
449 | break; | |
450 | } | |
451 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); | |
452 | if (err) | |
453 | break; | |
454 | ||
9a57fffe | 455 | i = array_index_nospec(up->offset + done, ctx->nr_user_bufs); |
19a63c40 | 456 | if (ctx->user_bufs[i] != &dummy_ubuf) { |
73572984 | 457 | err = io_queue_rsrc_removal(ctx->buf_data, i, |
63fea890 | 458 | ctx->user_bufs[i]); |
73572984 JA |
459 | if (unlikely(err)) { |
460 | io_buffer_unmap(ctx, &imu); | |
461 | break; | |
462 | } | |
19a63c40 | 463 | ctx->user_bufs[i] = (struct io_mapped_ubuf *)&dummy_ubuf; |
73572984 JA |
464 | } |
465 | ||
466 | ctx->user_bufs[i] = imu; | |
953c37e0 | 467 | *io_get_tag_slot(ctx->buf_data, i) = tag; |
73572984 | 468 | } |
73572984 JA |
469 | return done ? done : err; |
470 | } | |
471 | ||
472 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, | |
473 | struct io_uring_rsrc_update2 *up, | |
474 | unsigned nr_args) | |
475 | { | |
476 | __u32 tmp; | |
73572984 | 477 | |
786788a8 PB |
478 | lockdep_assert_held(&ctx->uring_lock); |
479 | ||
73572984 JA |
480 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
481 | return -EOVERFLOW; | |
73572984 JA |
482 | |
483 | switch (type) { | |
484 | case IORING_RSRC_FILE: | |
485 | return __io_sqe_files_update(ctx, up, nr_args); | |
486 | case IORING_RSRC_BUFFER: | |
487 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
488 | } | |
489 | return -EINVAL; | |
490 | } | |
491 | ||
492 | int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, | |
493 | unsigned nr_args) | |
494 | { | |
495 | struct io_uring_rsrc_update2 up; | |
496 | ||
497 | if (!nr_args) | |
498 | return -EINVAL; | |
499 | memset(&up, 0, sizeof(up)); | |
500 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
501 | return -EFAULT; | |
502 | if (up.resv || up.resv2) | |
503 | return -EINVAL; | |
504 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
505 | } | |
506 | ||
507 | int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
508 | unsigned size, unsigned type) | |
509 | { | |
510 | struct io_uring_rsrc_update2 up; | |
511 | ||
512 | if (size != sizeof(up)) | |
513 | return -EINVAL; | |
514 | if (copy_from_user(&up, arg, sizeof(up))) | |
515 | return -EFAULT; | |
516 | if (!up.nr || up.resv || up.resv2) | |
517 | return -EINVAL; | |
518 | return __io_register_rsrc_update(ctx, type, &up, up.nr); | |
519 | } | |
520 | ||
521 | __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, | |
522 | unsigned int size, unsigned int type) | |
523 | { | |
524 | struct io_uring_rsrc_register rr; | |
525 | ||
526 | /* keep it extendible */ | |
527 | if (size != sizeof(rr)) | |
528 | return -EINVAL; | |
529 | ||
530 | memset(&rr, 0, sizeof(rr)); | |
531 | if (copy_from_user(&rr, arg, size)) | |
532 | return -EFAULT; | |
533 | if (!rr.nr || rr.resv2) | |
534 | return -EINVAL; | |
535 | if (rr.flags & ~IORING_RSRC_REGISTER_SPARSE) | |
536 | return -EINVAL; | |
537 | ||
538 | switch (type) { | |
539 | case IORING_RSRC_FILE: | |
540 | if (rr.flags & IORING_RSRC_REGISTER_SPARSE && rr.data) | |
541 | break; | |
542 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
543 | rr.nr, u64_to_user_ptr(rr.tags)); | |
544 | case IORING_RSRC_BUFFER: | |
545 | if (rr.flags & IORING_RSRC_REGISTER_SPARSE && rr.data) | |
546 | break; | |
547 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
548 | rr.nr, u64_to_user_ptr(rr.tags)); | |
549 | } | |
550 | return -EINVAL; | |
551 | } | |
552 | ||
d9808ceb | 553 | int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
73572984 | 554 | { |
f2ccb5ae | 555 | struct io_rsrc_update *up = io_kiocb_to_cmd(req, struct io_rsrc_update); |
73572984 JA |
556 | |
557 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) | |
558 | return -EINVAL; | |
559 | if (sqe->rw_flags || sqe->splice_fd_in) | |
560 | return -EINVAL; | |
561 | ||
562 | up->offset = READ_ONCE(sqe->off); | |
563 | up->nr_args = READ_ONCE(sqe->len); | |
564 | if (!up->nr_args) | |
565 | return -EINVAL; | |
566 | up->arg = READ_ONCE(sqe->addr); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | static int io_files_update_with_index_alloc(struct io_kiocb *req, | |
571 | unsigned int issue_flags) | |
572 | { | |
f2ccb5ae | 573 | struct io_rsrc_update *up = io_kiocb_to_cmd(req, struct io_rsrc_update); |
73572984 JA |
574 | __s32 __user *fds = u64_to_user_ptr(up->arg); |
575 | unsigned int done; | |
576 | struct file *file; | |
577 | int ret, fd; | |
578 | ||
579 | if (!req->ctx->file_data) | |
580 | return -ENXIO; | |
581 | ||
582 | for (done = 0; done < up->nr_args; done++) { | |
583 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
584 | ret = -EFAULT; | |
585 | break; | |
586 | } | |
587 | ||
588 | file = fget(fd); | |
589 | if (!file) { | |
590 | ret = -EBADF; | |
591 | break; | |
592 | } | |
593 | ret = io_fixed_fd_install(req, issue_flags, file, | |
594 | IORING_FILE_INDEX_ALLOC); | |
595 | if (ret < 0) | |
596 | break; | |
597 | if (copy_to_user(&fds[done], &ret, sizeof(ret))) { | |
f110ed84 | 598 | __io_close_fixed(req->ctx, issue_flags, ret); |
73572984 JA |
599 | ret = -EFAULT; |
600 | break; | |
601 | } | |
602 | } | |
603 | ||
604 | if (done) | |
605 | return done; | |
606 | return ret; | |
607 | } | |
608 | ||
d9808ceb | 609 | int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
73572984 | 610 | { |
f2ccb5ae | 611 | struct io_rsrc_update *up = io_kiocb_to_cmd(req, struct io_rsrc_update); |
73572984 JA |
612 | struct io_ring_ctx *ctx = req->ctx; |
613 | struct io_uring_rsrc_update2 up2; | |
614 | int ret; | |
615 | ||
616 | up2.offset = up->offset; | |
617 | up2.data = up->arg; | |
618 | up2.nr = 0; | |
619 | up2.tags = 0; | |
620 | up2.resv = 0; | |
621 | up2.resv2 = 0; | |
622 | ||
623 | if (up->offset == IORING_FILE_INDEX_ALLOC) { | |
624 | ret = io_files_update_with_index_alloc(req, issue_flags); | |
625 | } else { | |
626 | io_ring_submit_lock(ctx, issue_flags); | |
627 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, | |
628 | &up2, up->nr_args); | |
629 | io_ring_submit_unlock(ctx, issue_flags); | |
630 | } | |
631 | ||
632 | if (ret < 0) | |
633 | req_set_fail(req); | |
634 | io_req_set_res(req, ret, 0); | |
635 | return IOU_OK; | |
636 | } | |
637 | ||
63fea890 | 638 | int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc) |
73572984 | 639 | { |
63fea890 PB |
640 | struct io_ring_ctx *ctx = data->ctx; |
641 | struct io_rsrc_node *node = ctx->rsrc_node; | |
73572984 | 642 | u64 *tag_slot = io_get_tag_slot(data, idx); |
73572984 | 643 | |
c376644f PB |
644 | ctx->rsrc_node = io_rsrc_node_alloc(ctx); |
645 | if (unlikely(!ctx->rsrc_node)) { | |
646 | ctx->rsrc_node = node; | |
647 | return -ENOMEM; | |
ff7c75ec | 648 | } |
73572984 | 649 | |
c376644f | 650 | node->item.rsrc = rsrc; |
2236b390 | 651 | node->type = data->rsrc_type; |
c376644f | 652 | node->item.tag = *tag_slot; |
73572984 | 653 | *tag_slot = 0; |
c376644f PB |
654 | list_add_tail(&node->node, &ctx->rsrc_ref_list); |
655 | io_put_rsrc_node(ctx, node); | |
73572984 JA |
656 | return 0; |
657 | } | |
658 | ||
659 | void __io_sqe_files_unregister(struct io_ring_ctx *ctx) | |
660 | { | |
73572984 JA |
661 | int i; |
662 | ||
663 | for (i = 0; i < ctx->nr_user_files; i++) { | |
664 | struct file *file = io_file_from_index(&ctx->file_table, i); | |
665 | ||
6e5e6d27 | 666 | if (!file) |
73572984 JA |
667 | continue; |
668 | io_file_bitmap_clear(&ctx->file_table, i); | |
669 | fput(file); | |
670 | } | |
73572984 | 671 | |
73572984 | 672 | io_free_file_tables(&ctx->file_table); |
02a4d923 | 673 | io_file_table_set_alloc_range(ctx, 0, 0); |
73572984 JA |
674 | io_rsrc_data_free(ctx->file_data); |
675 | ctx->file_data = NULL; | |
676 | ctx->nr_user_files = 0; | |
677 | } | |
678 | ||
679 | int io_sqe_files_unregister(struct io_ring_ctx *ctx) | |
680 | { | |
681 | unsigned nr = ctx->nr_user_files; | |
682 | int ret; | |
683 | ||
684 | if (!ctx->file_data) | |
685 | return -ENXIO; | |
686 | ||
687 | /* | |
688 | * Quiesce may unlock ->uring_lock, and while it's not held | |
689 | * prevent new requests using the table. | |
690 | */ | |
691 | ctx->nr_user_files = 0; | |
692 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); | |
693 | ctx->nr_user_files = nr; | |
694 | if (!ret) | |
695 | __io_sqe_files_unregister(ctx); | |
696 | return ret; | |
697 | } | |
698 | ||
73572984 JA |
699 | int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
700 | unsigned nr_args, u64 __user *tags) | |
701 | { | |
702 | __s32 __user *fds = (__s32 __user *) arg; | |
703 | struct file *file; | |
704 | int fd, ret; | |
705 | unsigned i; | |
706 | ||
707 | if (ctx->file_data) | |
708 | return -EBUSY; | |
709 | if (!nr_args) | |
710 | return -EINVAL; | |
711 | if (nr_args > IORING_MAX_FIXED_FILES) | |
712 | return -EMFILE; | |
713 | if (nr_args > rlimit(RLIMIT_NOFILE)) | |
714 | return -EMFILE; | |
fc7f3a8d | 715 | ret = io_rsrc_data_alloc(ctx, IORING_RSRC_FILE, tags, nr_args, |
73572984 JA |
716 | &ctx->file_data); |
717 | if (ret) | |
718 | return ret; | |
719 | ||
720 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) { | |
721 | io_rsrc_data_free(ctx->file_data); | |
722 | ctx->file_data = NULL; | |
723 | return -ENOMEM; | |
724 | } | |
725 | ||
726 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { | |
727 | struct io_fixed_file *file_slot; | |
728 | ||
729 | if (fds && copy_from_user(&fd, &fds[i], sizeof(fd))) { | |
730 | ret = -EFAULT; | |
731 | goto fail; | |
732 | } | |
733 | /* allow sparse sets */ | |
734 | if (!fds || fd == -1) { | |
735 | ret = -EINVAL; | |
736 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) | |
737 | goto fail; | |
738 | continue; | |
739 | } | |
740 | ||
741 | file = fget(fd); | |
742 | ret = -EBADF; | |
743 | if (unlikely(!file)) | |
744 | goto fail; | |
745 | ||
746 | /* | |
6e5e6d27 | 747 | * Don't allow io_uring instances to be registered. |
73572984 JA |
748 | */ |
749 | if (io_is_uring_fops(file)) { | |
750 | fput(file); | |
751 | goto fail; | |
752 | } | |
73572984 JA |
753 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
754 | io_fixed_file_set(file_slot, file); | |
755 | io_file_bitmap_set(&ctx->file_table, i); | |
756 | } | |
757 | ||
6e73dffb PB |
758 | /* default it to the whole table */ |
759 | io_file_table_set_alloc_range(ctx, 0, ctx->nr_user_files); | |
73572984 JA |
760 | return 0; |
761 | fail: | |
762 | __io_sqe_files_unregister(ctx); | |
763 | return ret; | |
764 | } | |
765 | ||
766 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) | |
767 | { | |
768 | io_buffer_unmap(ctx, &prsrc->buf); | |
769 | prsrc->buf = NULL; | |
770 | } | |
771 | ||
772 | void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) | |
773 | { | |
774 | unsigned int i; | |
775 | ||
776 | for (i = 0; i < ctx->nr_user_bufs; i++) | |
777 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
778 | kfree(ctx->user_bufs); | |
779 | io_rsrc_data_free(ctx->buf_data); | |
780 | ctx->user_bufs = NULL; | |
781 | ctx->buf_data = NULL; | |
782 | ctx->nr_user_bufs = 0; | |
783 | } | |
784 | ||
785 | int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) | |
786 | { | |
787 | unsigned nr = ctx->nr_user_bufs; | |
788 | int ret; | |
789 | ||
790 | if (!ctx->buf_data) | |
791 | return -ENXIO; | |
792 | ||
793 | /* | |
794 | * Quiesce may unlock ->uring_lock, and while it's not held | |
795 | * prevent new requests using the table. | |
796 | */ | |
797 | ctx->nr_user_bufs = 0; | |
798 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); | |
799 | ctx->nr_user_bufs = nr; | |
800 | if (!ret) | |
801 | __io_sqe_buffers_unregister(ctx); | |
802 | return ret; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Not super efficient, but this is just a registration time. And we do cache | |
807 | * the last compound head, so generally we'll only do a full search if we don't | |
808 | * match that one. | |
809 | * | |
810 | * We check if the given compound head page has already been accounted, to | |
811 | * avoid double accounting it. This allows us to account the full size of the | |
812 | * page, not just the constituent pages of a huge page. | |
813 | */ | |
814 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
815 | int nr_pages, struct page *hpage) | |
816 | { | |
817 | int i, j; | |
818 | ||
819 | /* check current page array */ | |
820 | for (i = 0; i < nr_pages; i++) { | |
821 | if (!PageCompound(pages[i])) | |
822 | continue; | |
823 | if (compound_head(pages[i]) == hpage) | |
824 | return true; | |
825 | } | |
826 | ||
827 | /* check previously registered pages */ | |
828 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
829 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; | |
830 | ||
831 | for (j = 0; j < imu->nr_bvecs; j++) { | |
832 | if (!PageCompound(imu->bvec[j].bv_page)) | |
833 | continue; | |
834 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
835 | return true; | |
836 | } | |
837 | } | |
838 | ||
839 | return false; | |
840 | } | |
841 | ||
842 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
843 | int nr_pages, struct io_mapped_ubuf *imu, | |
844 | struct page **last_hpage) | |
845 | { | |
846 | int i, ret; | |
847 | ||
848 | imu->acct_pages = 0; | |
849 | for (i = 0; i < nr_pages; i++) { | |
850 | if (!PageCompound(pages[i])) { | |
851 | imu->acct_pages++; | |
852 | } else { | |
853 | struct page *hpage; | |
854 | ||
855 | hpage = compound_head(pages[i]); | |
856 | if (hpage == *last_hpage) | |
857 | continue; | |
858 | *last_hpage = hpage; | |
859 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
860 | continue; | |
861 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
862 | } | |
863 | } | |
864 | ||
865 | if (!imu->acct_pages) | |
866 | return 0; | |
867 | ||
868 | ret = io_account_mem(ctx, imu->acct_pages); | |
869 | if (ret) | |
870 | imu->acct_pages = 0; | |
871 | return ret; | |
872 | } | |
873 | ||
73572984 JA |
874 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
875 | struct io_mapped_ubuf **pimu, | |
876 | struct page **last_hpage) | |
877 | { | |
878 | struct io_mapped_ubuf *imu = NULL; | |
879 | struct page **pages = NULL; | |
880 | unsigned long off; | |
881 | size_t size; | |
882 | int ret, nr_pages, i; | |
977bc873 | 883 | struct folio *folio = NULL; |
73572984 | 884 | |
19a63c40 | 885 | *pimu = (struct io_mapped_ubuf *)&dummy_ubuf; |
5ff4fdff | 886 | if (!iov->iov_base) |
73572984 | 887 | return 0; |
73572984 | 888 | |
73572984 | 889 | ret = -ENOMEM; |
73572984 JA |
890 | pages = io_pin_pages((unsigned long) iov->iov_base, iov->iov_len, |
891 | &nr_pages); | |
892 | if (IS_ERR(pages)) { | |
893 | ret = PTR_ERR(pages); | |
894 | pages = NULL; | |
895 | goto done; | |
896 | } | |
897 | ||
57bebf80 PB |
898 | /* If it's a huge page, try to coalesce them into a single bvec entry */ |
899 | if (nr_pages > 1) { | |
900 | folio = page_folio(pages[0]); | |
901 | for (i = 1; i < nr_pages; i++) { | |
776617db TH |
902 | /* |
903 | * Pages must be consecutive and on the same folio for | |
904 | * this to work | |
905 | */ | |
906 | if (page_folio(pages[i]) != folio || | |
907 | pages[i] != pages[i - 1] + 1) { | |
57bebf80 PB |
908 | folio = NULL; |
909 | break; | |
910 | } | |
911 | } | |
912 | if (folio) { | |
d2acf789 PB |
913 | /* |
914 | * The pages are bound to the folio, it doesn't | |
915 | * actually unpin them but drops all but one reference, | |
916 | * which is usually put down by io_buffer_unmap(). | |
917 | * Note, needs a better helper. | |
918 | */ | |
919 | unpin_user_pages(&pages[1], nr_pages - 1); | |
57bebf80 PB |
920 | nr_pages = 1; |
921 | } | |
922 | } | |
923 | ||
73572984 JA |
924 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
925 | if (!imu) | |
926 | goto done; | |
927 | ||
928 | ret = io_buffer_account_pin(ctx, pages, nr_pages, imu, last_hpage); | |
929 | if (ret) { | |
930 | unpin_user_pages(pages, nr_pages); | |
931 | goto done; | |
932 | } | |
933 | ||
934 | off = (unsigned long) iov->iov_base & ~PAGE_MASK; | |
935 | size = iov->iov_len; | |
57bebf80 PB |
936 | /* store original address for later verification */ |
937 | imu->ubuf = (unsigned long) iov->iov_base; | |
938 | imu->ubuf_end = imu->ubuf + iov->iov_len; | |
939 | imu->nr_bvecs = nr_pages; | |
940 | *pimu = imu; | |
941 | ret = 0; | |
942 | ||
943 | if (folio) { | |
944 | bvec_set_page(&imu->bvec[0], pages[0], size, off); | |
945 | goto done; | |
946 | } | |
73572984 JA |
947 | for (i = 0; i < nr_pages; i++) { |
948 | size_t vec_len; | |
949 | ||
950 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
cc342a21 | 951 | bvec_set_page(&imu->bvec[i], pages[i], vec_len, off); |
73572984 JA |
952 | off = 0; |
953 | size -= vec_len; | |
954 | } | |
73572984 JA |
955 | done: |
956 | if (ret) | |
957 | kvfree(imu); | |
958 | kvfree(pages); | |
959 | return ret; | |
960 | } | |
961 | ||
962 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) | |
963 | { | |
964 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); | |
965 | return ctx->user_bufs ? 0 : -ENOMEM; | |
966 | } | |
967 | ||
968 | int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, | |
969 | unsigned int nr_args, u64 __user *tags) | |
970 | { | |
971 | struct page *last_hpage = NULL; | |
972 | struct io_rsrc_data *data; | |
973 | int i, ret; | |
974 | struct iovec iov; | |
975 | ||
976 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
977 | ||
978 | if (ctx->user_bufs) | |
979 | return -EBUSY; | |
980 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) | |
981 | return -EINVAL; | |
fc7f3a8d | 982 | ret = io_rsrc_data_alloc(ctx, IORING_RSRC_BUFFER, tags, nr_args, &data); |
73572984 JA |
983 | if (ret) |
984 | return ret; | |
985 | ret = io_buffers_map_alloc(ctx, nr_args); | |
986 | if (ret) { | |
987 | io_rsrc_data_free(data); | |
988 | return ret; | |
989 | } | |
990 | ||
991 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { | |
992 | if (arg) { | |
993 | ret = io_copy_iov(ctx, &iov, arg, i); | |
994 | if (ret) | |
995 | break; | |
996 | ret = io_buffer_validate(&iov); | |
997 | if (ret) | |
998 | break; | |
999 | } else { | |
1000 | memset(&iov, 0, sizeof(iov)); | |
1001 | } | |
1002 | ||
1003 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { | |
1004 | ret = -EINVAL; | |
1005 | break; | |
1006 | } | |
1007 | ||
1008 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], | |
1009 | &last_hpage); | |
1010 | if (ret) | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | WARN_ON_ONCE(ctx->buf_data); | |
1015 | ||
1016 | ctx->buf_data = data; | |
1017 | if (ret) | |
1018 | __io_sqe_buffers_unregister(ctx); | |
73572984 JA |
1019 | return ret; |
1020 | } | |
c059f785 PB |
1021 | |
1022 | int io_import_fixed(int ddir, struct iov_iter *iter, | |
1023 | struct io_mapped_ubuf *imu, | |
1024 | u64 buf_addr, size_t len) | |
1025 | { | |
1026 | u64 buf_end; | |
1027 | size_t offset; | |
1028 | ||
1029 | if (WARN_ON_ONCE(!imu)) | |
1030 | return -EFAULT; | |
1031 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) | |
1032 | return -EFAULT; | |
1033 | /* not inside the mapped region */ | |
1034 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) | |
1035 | return -EFAULT; | |
1036 | ||
1037 | /* | |
6bf65a1b | 1038 | * Might not be a start of buffer, set size appropriately |
c059f785 PB |
1039 | * and advance us to the beginning. |
1040 | */ | |
1041 | offset = buf_addr - imu->ubuf; | |
1042 | iov_iter_bvec(iter, ddir, imu->bvec, imu->nr_bvecs, offset + len); | |
1043 | ||
1044 | if (offset) { | |
1045 | /* | |
1046 | * Don't use iov_iter_advance() here, as it's really slow for | |
1047 | * using the latter parts of a big fixed buffer - it iterates | |
1048 | * over each segment manually. We can cheat a bit here, because | |
1049 | * we know that: | |
1050 | * | |
1051 | * 1) it's a BVEC iter, we set it up | |
1052 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
1053 | * first and last bvec | |
1054 | * | |
1055 | * So just find our index, and adjust the iterator afterwards. | |
1056 | * If the offset is within the first bvec (or the whole first | |
1057 | * bvec, just use iov_iter_advance(). This makes it easier | |
1058 | * since we can just skip the first segment, which may not | |
1059 | * be PAGE_SIZE aligned. | |
1060 | */ | |
1061 | const struct bio_vec *bvec = imu->bvec; | |
1062 | ||
d6fef34e | 1063 | if (offset < bvec->bv_len) { |
57bebf80 PB |
1064 | /* |
1065 | * Note, huge pages buffers consists of one large | |
1066 | * bvec entry and should always go this way. The other | |
1067 | * branch doesn't expect non PAGE_SIZE'd chunks. | |
1068 | */ | |
b000ae0e PB |
1069 | iter->bvec = bvec; |
1070 | iter->nr_segs = bvec->bv_len; | |
1071 | iter->count -= offset; | |
1072 | iter->iov_offset = offset; | |
c059f785 PB |
1073 | } else { |
1074 | unsigned long seg_skip; | |
1075 | ||
1076 | /* skip first vec */ | |
1077 | offset -= bvec->bv_len; | |
1078 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
1079 | ||
1080 | iter->bvec = bvec + seg_skip; | |
1081 | iter->nr_segs -= seg_skip; | |
1082 | iter->count -= bvec->bv_len + offset; | |
1083 | iter->iov_offset = offset & ~PAGE_MASK; | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | return 0; | |
1088 | } |