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Merge tag 'for-linus' of git://github.com/openrisc/linux
[linux/fpc-iii.git] / kernel / bpf / syscall.c
blob86299a292214a863726fe1efcbc575cd599c90ae
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 */
4 #include <linux/bpf.h>
5 #include <linux/bpf_trace.h>
6 #include <linux/bpf_lirc.h>
7 #include <linux/btf.h>
8 #include <linux/syscalls.h>
9 #include <linux/slab.h>
10 #include <linux/sched/signal.h>
11 #include <linux/vmalloc.h>
12 #include <linux/mmzone.h>
13 #include <linux/anon_inodes.h>
14 #include <linux/fdtable.h>
15 #include <linux/file.h>
16 #include <linux/fs.h>
17 #include <linux/license.h>
18 #include <linux/filter.h>
19 #include <linux/version.h>
20 #include <linux/kernel.h>
21 #include <linux/idr.h>
22 #include <linux/cred.h>
23 #include <linux/timekeeping.h>
24 #include <linux/ctype.h>
25 #include <linux/nospec.h>
26 #include <linux/audit.h>
27 #include <uapi/linux/btf.h>
28 #include <linux/pgtable.h>
29 #include <linux/bpf_lsm.h>
30 #include <linux/poll.h>
31 #include <linux/bpf-netns.h>
32
33 #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
34 (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
35 (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
36 #define IS_FD_PROG_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY)
37 #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
38 #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map) || \
39 IS_FD_HASH(map))
40
41 #define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
42
43 DEFINE_PER_CPU(int, bpf_prog_active);
44 static DEFINE_IDR(prog_idr);
45 static DEFINE_SPINLOCK(prog_idr_lock);
46 static DEFINE_IDR(map_idr);
47 static DEFINE_SPINLOCK(map_idr_lock);
48 static DEFINE_IDR(link_idr);
49 static DEFINE_SPINLOCK(link_idr_lock);
50
51 int sysctl_unprivileged_bpf_disabled __read_mostly;
52
53 static const struct bpf_map_ops * const bpf_map_types[] = {
54 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
55 #define BPF_MAP_TYPE(_id, _ops) \
56 [_id] = &_ops,
57 #define BPF_LINK_TYPE(_id, _name)
58 #include <linux/bpf_types.h>
59 #undef BPF_PROG_TYPE
60 #undef BPF_MAP_TYPE
61 #undef BPF_LINK_TYPE
62 };
63
64 /*
65 * If we're handed a bigger struct than we know of, ensure all the unknown bits
66 * are 0 - i.e. new user-space does not rely on any kernel feature extensions
67 * we don't know about yet.
68 *
69 * There is a ToCToU between this function call and the following
70 * copy_from_user() call. However, this is not a concern since this function is
71 * meant to be a future-proofing of bits.
72 */
73 int bpf_check_uarg_tail_zero(void __user *uaddr,
74 size_t expected_size,
75 size_t actual_size)
76 {
77 unsigned char __user *addr = uaddr + expected_size;
78 int res;
79
80 if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
81 return -E2BIG;
82
83 if (actual_size <= expected_size)
84 return 0;
85
86 res = check_zeroed_user(addr, actual_size - expected_size);
87 if (res < 0)
88 return res;
89 return res ? 0 : -E2BIG;
90 }
91
92 const struct bpf_map_ops bpf_map_offload_ops = {
93 .map_alloc = bpf_map_offload_map_alloc,
94 .map_free = bpf_map_offload_map_free,
95 .map_check_btf = map_check_no_btf,
96 };
97
98 static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
99 {
100 const struct bpf_map_ops *ops;
101 u32 type = attr->map_type;
102 struct bpf_map *map;
103 int err;
104
105 if (type >= ARRAY_SIZE(bpf_map_types))
106 return ERR_PTR(-EINVAL);
107 type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types));
108 ops = bpf_map_types[type];
109 if (!ops)
110 return ERR_PTR(-EINVAL);
111
112 if (ops->map_alloc_check) {
113 err = ops->map_alloc_check(attr);
114 if (err)
115 return ERR_PTR(err);
116 }
117 if (attr->map_ifindex)
118 ops = &bpf_map_offload_ops;
119 map = ops->map_alloc(attr);
120 if (IS_ERR(map))
121 return map;
122 map->ops = ops;
123 map->map_type = type;
124 return map;
125 }
126
127 static u32 bpf_map_value_size(struct bpf_map *map)
128 {
129 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
130 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
131 map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
132 map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
133 return round_up(map->value_size, 8) * num_possible_cpus();
134 else if (IS_FD_MAP(map))
135 return sizeof(u32);
136 else
137 return map->value_size;
138 }
139
140 static void maybe_wait_bpf_programs(struct bpf_map *map)
141 {
142 /* Wait for any running BPF programs to complete so that
143 * userspace, when we return to it, knows that all programs
144 * that could be running use the new map value.
145 */
146 if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
147 map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
148 synchronize_rcu();
149 }
150
151 static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key,
152 void *value, __u64 flags)
153 {
154 int err;
155
156 /* Need to create a kthread, thus must support schedule */
157 if (bpf_map_is_dev_bound(map)) {
158 return bpf_map_offload_update_elem(map, key, value, flags);
159 } else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
160 map->map_type == BPF_MAP_TYPE_SOCKHASH ||
161 map->map_type == BPF_MAP_TYPE_SOCKMAP ||
162 map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
163 return map->ops->map_update_elem(map, key, value, flags);
164 } else if (IS_FD_PROG_ARRAY(map)) {
165 return bpf_fd_array_map_update_elem(map, f.file, key, value,
166 flags);
167 }
168
169 bpf_disable_instrumentation();
170 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
171 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
172 err = bpf_percpu_hash_update(map, key, value, flags);
173 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
174 err = bpf_percpu_array_update(map, key, value, flags);
175 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
176 err = bpf_percpu_cgroup_storage_update(map, key, value,
177 flags);
178 } else if (IS_FD_ARRAY(map)) {
179 rcu_read_lock();
180 err = bpf_fd_array_map_update_elem(map, f.file, key, value,
181 flags);
182 rcu_read_unlock();
183 } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
184 rcu_read_lock();
185 err = bpf_fd_htab_map_update_elem(map, f.file, key, value,
186 flags);
187 rcu_read_unlock();
188 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
189 /* rcu_read_lock() is not needed */
190 err = bpf_fd_reuseport_array_update_elem(map, key, value,
191 flags);
192 } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
193 map->map_type == BPF_MAP_TYPE_STACK) {
194 err = map->ops->map_push_elem(map, value, flags);
195 } else {
196 rcu_read_lock();
197 err = map->ops->map_update_elem(map, key, value, flags);
198 rcu_read_unlock();
199 }
200 bpf_enable_instrumentation();
201 maybe_wait_bpf_programs(map);
202
203 return err;
204 }
205
206 static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
207 __u64 flags)
208 {
209 void *ptr;
210 int err;
211
212 if (bpf_map_is_dev_bound(map))
213 return bpf_map_offload_lookup_elem(map, key, value);
214
215 bpf_disable_instrumentation();
216 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
217 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
218 err = bpf_percpu_hash_copy(map, key, value);
219 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
220 err = bpf_percpu_array_copy(map, key, value);
221 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
222 err = bpf_percpu_cgroup_storage_copy(map, key, value);
223 } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
224 err = bpf_stackmap_copy(map, key, value);
225 } else if (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map)) {
226 err = bpf_fd_array_map_lookup_elem(map, key, value);
227 } else if (IS_FD_HASH(map)) {
228 err = bpf_fd_htab_map_lookup_elem(map, key, value);
229 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
230 err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
231 } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
232 map->map_type == BPF_MAP_TYPE_STACK) {
233 err = map->ops->map_peek_elem(map, value);
234 } else if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
235 /* struct_ops map requires directly updating "value" */
236 err = bpf_struct_ops_map_sys_lookup_elem(map, key, value);
237 } else {
238 rcu_read_lock();
239 if (map->ops->map_lookup_elem_sys_only)
240 ptr = map->ops->map_lookup_elem_sys_only(map, key);
241 else
242 ptr = map->ops->map_lookup_elem(map, key);
243 if (IS_ERR(ptr)) {
244 err = PTR_ERR(ptr);
245 } else if (!ptr) {
246 err = -ENOENT;
247 } else {
248 err = 0;
249 if (flags & BPF_F_LOCK)
250 /* lock 'ptr' and copy everything but lock */
251 copy_map_value_locked(map, value, ptr, true);
252 else
253 copy_map_value(map, value, ptr);
254 /* mask lock, since value wasn't zero inited */
255 check_and_init_map_lock(map, value);
256 }
257 rcu_read_unlock();
258 }
259
260 bpf_enable_instrumentation();
261 maybe_wait_bpf_programs(map);
262
263 return err;
264 }
265
266 static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable)
267 {
268 /* We really just want to fail instead of triggering OOM killer
269 * under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
270 * which is used for lower order allocation requests.
271 *
272 * It has been observed that higher order allocation requests done by
273 * vmalloc with __GFP_NORETRY being set might fail due to not trying
274 * to reclaim memory from the page cache, thus we set
275 * __GFP_RETRY_MAYFAIL to avoid such situations.
276 */
277
278 const gfp_t gfp = __GFP_NOWARN | __GFP_ZERO;
279 unsigned int flags = 0;
280 unsigned long align = 1;
281 void *area;
282
283 if (size >= SIZE_MAX)
284 return NULL;
285
286 /* kmalloc()'ed memory can't be mmap()'ed */
287 if (mmapable) {
288 BUG_ON(!PAGE_ALIGNED(size));
289 align = SHMLBA;
290 flags = VM_USERMAP;
291 } else if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
292 area = kmalloc_node(size, gfp | GFP_USER | __GFP_NORETRY,
293 numa_node);
294 if (area != NULL)
295 return area;
296 }
297
298 return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
299 gfp | GFP_KERNEL | __GFP_RETRY_MAYFAIL, PAGE_KERNEL,
300 flags, numa_node, __builtin_return_address(0));
301 }
302
303 void *bpf_map_area_alloc(u64 size, int numa_node)
304 {
305 return __bpf_map_area_alloc(size, numa_node, false);
306 }
307
308 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node)
309 {
310 return __bpf_map_area_alloc(size, numa_node, true);
311 }
312
313 void bpf_map_area_free(void *area)
314 {
315 kvfree(area);
316 }
317
318 static u32 bpf_map_flags_retain_permanent(u32 flags)
319 {
320 /* Some map creation flags are not tied to the map object but
321 * rather to the map fd instead, so they have no meaning upon
322 * map object inspection since multiple file descriptors with
323 * different (access) properties can exist here. Thus, given
324 * this has zero meaning for the map itself, lets clear these
325 * from here.
326 */
327 return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY);
328 }
329
330 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
331 {
332 map->map_type = attr->map_type;
333 map->key_size = attr->key_size;
334 map->value_size = attr->value_size;
335 map->max_entries = attr->max_entries;
336 map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags);
337 map->numa_node = bpf_map_attr_numa_node(attr);
338 }
339
340 static int bpf_charge_memlock(struct user_struct *user, u32 pages)
341 {
342 unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
343
344 if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) {
345 atomic_long_sub(pages, &user->locked_vm);
346 return -EPERM;
347 }
348 return 0;
349 }
350
351 static void bpf_uncharge_memlock(struct user_struct *user, u32 pages)
352 {
353 if (user)
354 atomic_long_sub(pages, &user->locked_vm);
355 }
356
357 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size)
358 {
359 u32 pages = round_up(size, PAGE_SIZE) >> PAGE_SHIFT;
360 struct user_struct *user;
361 int ret;
362
363 if (size >= U32_MAX - PAGE_SIZE)
364 return -E2BIG;
365
366 user = get_current_user();
367 ret = bpf_charge_memlock(user, pages);
368 if (ret) {
369 free_uid(user);
370 return ret;
371 }
372
373 mem->pages = pages;
374 mem->user = user;
375
376 return 0;
377 }
378
379 void bpf_map_charge_finish(struct bpf_map_memory *mem)
380 {
381 bpf_uncharge_memlock(mem->user, mem->pages);
382 free_uid(mem->user);
383 }
384
385 void bpf_map_charge_move(struct bpf_map_memory *dst,
386 struct bpf_map_memory *src)
387 {
388 *dst = *src;
389
390 /* Make sure src will not be used for the redundant uncharging. */
391 memset(src, 0, sizeof(struct bpf_map_memory));
392 }
393
394 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages)
395 {
396 int ret;
397
398 ret = bpf_charge_memlock(map->memory.user, pages);
399 if (ret)
400 return ret;
401 map->memory.pages += pages;
402 return ret;
403 }
404
405 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages)
406 {
407 bpf_uncharge_memlock(map->memory.user, pages);
408 map->memory.pages -= pages;
409 }
410
411 static int bpf_map_alloc_id(struct bpf_map *map)
412 {
413 int id;
414
415 idr_preload(GFP_KERNEL);
416 spin_lock_bh(&map_idr_lock);
417 id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
418 if (id > 0)
419 map->id = id;
420 spin_unlock_bh(&map_idr_lock);
421 idr_preload_end();
422
423 if (WARN_ON_ONCE(!id))
424 return -ENOSPC;
425
426 return id > 0 ? 0 : id;
427 }
428
429 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
430 {
431 unsigned long flags;
432
433 /* Offloaded maps are removed from the IDR store when their device
434 * disappears - even if someone holds an fd to them they are unusable,
435 * the memory is gone, all ops will fail; they are simply waiting for
436 * refcnt to drop to be freed.
437 */
438 if (!map->id)
439 return;
440
441 if (do_idr_lock)
442 spin_lock_irqsave(&map_idr_lock, flags);
443 else
444 __acquire(&map_idr_lock);
445
446 idr_remove(&map_idr, map->id);
447 map->id = 0;
448
449 if (do_idr_lock)
450 spin_unlock_irqrestore(&map_idr_lock, flags);
451 else
452 __release(&map_idr_lock);
453 }
454
455 /* called from workqueue */
456 static void bpf_map_free_deferred(struct work_struct *work)
457 {
458 struct bpf_map *map = container_of(work, struct bpf_map, work);
459 struct bpf_map_memory mem;
460
461 bpf_map_charge_move(&mem, &map->memory);
462 security_bpf_map_free(map);
463 /* implementation dependent freeing */
464 map->ops->map_free(map);
465 bpf_map_charge_finish(&mem);
466 }
467
468 static void bpf_map_put_uref(struct bpf_map *map)
469 {
470 if (atomic64_dec_and_test(&map->usercnt)) {
471 if (map->ops->map_release_uref)
472 map->ops->map_release_uref(map);
473 }
474 }
475
476 /* decrement map refcnt and schedule it for freeing via workqueue
477 * (unrelying map implementation ops->map_free() might sleep)
478 */
479 static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
480 {
481 if (atomic64_dec_and_test(&map->refcnt)) {
482 /* bpf_map_free_id() must be called first */
483 bpf_map_free_id(map, do_idr_lock);
484 btf_put(map->btf);
485 INIT_WORK(&map->work, bpf_map_free_deferred);
486 schedule_work(&map->work);
487 }
488 }
489
490 void bpf_map_put(struct bpf_map *map)
491 {
492 __bpf_map_put(map, true);
493 }
494 EXPORT_SYMBOL_GPL(bpf_map_put);
495
496 void bpf_map_put_with_uref(struct bpf_map *map)
497 {
498 bpf_map_put_uref(map);
499 bpf_map_put(map);
500 }
501
502 static int bpf_map_release(struct inode *inode, struct file *filp)
503 {
504 struct bpf_map *map = filp->private_data;
505
506 if (map->ops->map_release)
507 map->ops->map_release(map, filp);
508
509 bpf_map_put_with_uref(map);
510 return 0;
511 }
512
513 static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
514 {
515 fmode_t mode = f.file->f_mode;
516
517 /* Our file permissions may have been overridden by global
518 * map permissions facing syscall side.
519 */
520 if (READ_ONCE(map->frozen))
521 mode &= ~FMODE_CAN_WRITE;
522 return mode;
523 }
524
525 #ifdef CONFIG_PROC_FS
526 static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
527 {
528 const struct bpf_map *map = filp->private_data;
529 const struct bpf_array *array;
530 u32 type = 0, jited = 0;
531
532 if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
533 array = container_of(map, struct bpf_array, map);
534 type = array->aux->type;
535 jited = array->aux->jited;
536 }
537
538 seq_printf(m,
539 "map_type:\t%u\n"
540 "key_size:\t%u\n"
541 "value_size:\t%u\n"
542 "max_entries:\t%u\n"
543 "map_flags:\t%#x\n"
544 "memlock:\t%llu\n"
545 "map_id:\t%u\n"
546 "frozen:\t%u\n",
547 map->map_type,
548 map->key_size,
549 map->value_size,
550 map->max_entries,
551 map->map_flags,
552 map->memory.pages * 1ULL << PAGE_SHIFT,
553 map->id,
554 READ_ONCE(map->frozen));
555 if (type) {
556 seq_printf(m, "owner_prog_type:\t%u\n", type);
557 seq_printf(m, "owner_jited:\t%u\n", jited);
558 }
559 }
560 #endif
561
562 static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
563 loff_t *ppos)
564 {
565 /* We need this handler such that alloc_file() enables
566 * f_mode with FMODE_CAN_READ.
567 */
568 return -EINVAL;
569 }
570
571 static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
572 size_t siz, loff_t *ppos)
573 {
574 /* We need this handler such that alloc_file() enables
575 * f_mode with FMODE_CAN_WRITE.
576 */
577 return -EINVAL;
578 }
579
580 /* called for any extra memory-mapped regions (except initial) */
581 static void bpf_map_mmap_open(struct vm_area_struct *vma)
582 {
583 struct bpf_map *map = vma->vm_file->private_data;
584
585 if (vma->vm_flags & VM_MAYWRITE) {
586 mutex_lock(&map->freeze_mutex);
587 map->writecnt++;
588 mutex_unlock(&map->freeze_mutex);
589 }
590 }
591
592 /* called for all unmapped memory region (including initial) */
593 static void bpf_map_mmap_close(struct vm_area_struct *vma)
594 {
595 struct bpf_map *map = vma->vm_file->private_data;
596
597 if (vma->vm_flags & VM_MAYWRITE) {
598 mutex_lock(&map->freeze_mutex);
599 map->writecnt--;
600 mutex_unlock(&map->freeze_mutex);
601 }
602 }
603
604 static const struct vm_operations_struct bpf_map_default_vmops = {
605 .open = bpf_map_mmap_open,
606 .close = bpf_map_mmap_close,
607 };
608
609 static int bpf_map_mmap(struct file *filp, struct vm_area_struct *vma)
610 {
611 struct bpf_map *map = filp->private_data;
612 int err;
613
614 if (!map->ops->map_mmap || map_value_has_spin_lock(map))
615 return -ENOTSUPP;
616
617 if (!(vma->vm_flags & VM_SHARED))
618 return -EINVAL;
619
620 mutex_lock(&map->freeze_mutex);
621
622 if (vma->vm_flags & VM_WRITE) {
623 if (map->frozen) {
624 err = -EPERM;
625 goto out;
626 }
627 /* map is meant to be read-only, so do not allow mapping as
628 * writable, because it's possible to leak a writable page
629 * reference and allows user-space to still modify it after
630 * freezing, while verifier will assume contents do not change
631 */
632 if (map->map_flags & BPF_F_RDONLY_PROG) {
633 err = -EACCES;
634 goto out;
635 }
636 }
637
638 /* set default open/close callbacks */
639 vma->vm_ops = &bpf_map_default_vmops;
640 vma->vm_private_data = map;
641 vma->vm_flags &= ~VM_MAYEXEC;
642 if (!(vma->vm_flags & VM_WRITE))
643 /* disallow re-mapping with PROT_WRITE */
644 vma->vm_flags &= ~VM_MAYWRITE;
645
646 err = map->ops->map_mmap(map, vma);
647 if (err)
648 goto out;
649
650 if (vma->vm_flags & VM_MAYWRITE)
651 map->writecnt++;
652 out:
653 mutex_unlock(&map->freeze_mutex);
654 return err;
655 }
656
657 static __poll_t bpf_map_poll(struct file *filp, struct poll_table_struct *pts)
658 {
659 struct bpf_map *map = filp->private_data;
660
661 if (map->ops->map_poll)
662 return map->ops->map_poll(map, filp, pts);
663
664 return EPOLLERR;
665 }
666
667 const struct file_operations bpf_map_fops = {
668 #ifdef CONFIG_PROC_FS
669 .show_fdinfo = bpf_map_show_fdinfo,
670 #endif
671 .release = bpf_map_release,
672 .read = bpf_dummy_read,
673 .write = bpf_dummy_write,
674 .mmap = bpf_map_mmap,
675 .poll = bpf_map_poll,
676 };
677
678 int bpf_map_new_fd(struct bpf_map *map, int flags)
679 {
680 int ret;
681
682 ret = security_bpf_map(map, OPEN_FMODE(flags));
683 if (ret < 0)
684 return ret;
685
686 return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
687 flags | O_CLOEXEC);
688 }
689
690 int bpf_get_file_flag(int flags)
691 {
692 if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
693 return -EINVAL;
694 if (flags & BPF_F_RDONLY)
695 return O_RDONLY;
696 if (flags & BPF_F_WRONLY)
697 return O_WRONLY;
698 return O_RDWR;
699 }
700
701 /* helper macro to check that unused fields 'union bpf_attr' are zero */
702 #define CHECK_ATTR(CMD) \
703 memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
704 sizeof(attr->CMD##_LAST_FIELD), 0, \
705 sizeof(*attr) - \
706 offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
707 sizeof(attr->CMD##_LAST_FIELD)) != NULL
708
709 /* dst and src must have at least "size" number of bytes.
710 * Return strlen on success and < 0 on error.
711 */
712 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size)
713 {
714 const char *end = src + size;
715 const char *orig_src = src;
716
717 memset(dst, 0, size);
718 /* Copy all isalnum(), '_' and '.' chars. */
719 while (src < end && *src) {
720 if (!isalnum(*src) &&
721 *src != '_' && *src != '.')
722 return -EINVAL;
723 *dst++ = *src++;
724 }
725
726 /* No '\0' found in "size" number of bytes */
727 if (src == end)
728 return -EINVAL;
729
730 return src - orig_src;
731 }
732
733 int map_check_no_btf(const struct bpf_map *map,
734 const struct btf *btf,
735 const struct btf_type *key_type,
736 const struct btf_type *value_type)
737 {
738 return -ENOTSUPP;
739 }
740
741 static int map_check_btf(struct bpf_map *map, const struct btf *btf,
742 u32 btf_key_id, u32 btf_value_id)
743 {
744 const struct btf_type *key_type, *value_type;
745 u32 key_size, value_size;
746 int ret = 0;
747
748 /* Some maps allow key to be unspecified. */
749 if (btf_key_id) {
750 key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
751 if (!key_type || key_size != map->key_size)
752 return -EINVAL;
753 } else {
754 key_type = btf_type_by_id(btf, 0);
755 if (!map->ops->map_check_btf)
756 return -EINVAL;
757 }
758
759 value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
760 if (!value_type || value_size != map->value_size)
761 return -EINVAL;
762
763 map->spin_lock_off = btf_find_spin_lock(btf, value_type);
764
765 if (map_value_has_spin_lock(map)) {
766 if (map->map_flags & BPF_F_RDONLY_PROG)
767 return -EACCES;
768 if (map->map_type != BPF_MAP_TYPE_HASH &&
769 map->map_type != BPF_MAP_TYPE_ARRAY &&
770 map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
771 map->map_type != BPF_MAP_TYPE_SK_STORAGE)
772 return -ENOTSUPP;
773 if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
774 map->value_size) {
775 WARN_ONCE(1,
776 "verifier bug spin_lock_off %d value_size %d\n",
777 map->spin_lock_off, map->value_size);
778 return -EFAULT;
779 }
780 }
781
782 if (map->ops->map_check_btf)
783 ret = map->ops->map_check_btf(map, btf, key_type, value_type);
784
785 return ret;
786 }
787
788 #define BPF_MAP_CREATE_LAST_FIELD btf_vmlinux_value_type_id
789 /* called via syscall */
790 static int map_create(union bpf_attr *attr)
791 {
792 int numa_node = bpf_map_attr_numa_node(attr);
793 struct bpf_map_memory mem;
794 struct bpf_map *map;
795 int f_flags;
796 int err;
797
798 err = CHECK_ATTR(BPF_MAP_CREATE);
799 if (err)
800 return -EINVAL;
801
802 if (attr->btf_vmlinux_value_type_id) {
803 if (attr->map_type != BPF_MAP_TYPE_STRUCT_OPS ||
804 attr->btf_key_type_id || attr->btf_value_type_id)
805 return -EINVAL;
806 } else if (attr->btf_key_type_id && !attr->btf_value_type_id) {
807 return -EINVAL;
808 }
809
810 f_flags = bpf_get_file_flag(attr->map_flags);
811 if (f_flags < 0)
812 return f_flags;
813
814 if (numa_node != NUMA_NO_NODE &&
815 ((unsigned int)numa_node >= nr_node_ids ||
816 !node_online(numa_node)))
817 return -EINVAL;
818
819 /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
820 map = find_and_alloc_map(attr);
821 if (IS_ERR(map))
822 return PTR_ERR(map);
823
824 err = bpf_obj_name_cpy(map->name, attr->map_name,
825 sizeof(attr->map_name));
826 if (err < 0)
827 goto free_map;
828
829 atomic64_set(&map->refcnt, 1);
830 atomic64_set(&map->usercnt, 1);
831 mutex_init(&map->freeze_mutex);
832
833 map->spin_lock_off = -EINVAL;
834 if (attr->btf_key_type_id || attr->btf_value_type_id ||
835 /* Even the map's value is a kernel's struct,
836 * the bpf_prog.o must have BTF to begin with
837 * to figure out the corresponding kernel's
838 * counter part. Thus, attr->btf_fd has
839 * to be valid also.
840 */
841 attr->btf_vmlinux_value_type_id) {
842 struct btf *btf;
843
844 btf = btf_get_by_fd(attr->btf_fd);
845 if (IS_ERR(btf)) {
846 err = PTR_ERR(btf);
847 goto free_map;
848 }
849 map->btf = btf;
850
851 if (attr->btf_value_type_id) {
852 err = map_check_btf(map, btf, attr->btf_key_type_id,
853 attr->btf_value_type_id);
854 if (err)
855 goto free_map;
856 }
857
858 map->btf_key_type_id = attr->btf_key_type_id;
859 map->btf_value_type_id = attr->btf_value_type_id;
860 map->btf_vmlinux_value_type_id =
861 attr->btf_vmlinux_value_type_id;
862 }
863
864 err = security_bpf_map_alloc(map);
865 if (err)
866 goto free_map;
867
868 err = bpf_map_alloc_id(map);
869 if (err)
870 goto free_map_sec;
871
872 err = bpf_map_new_fd(map, f_flags);
873 if (err < 0) {
874 /* failed to allocate fd.
875 * bpf_map_put_with_uref() is needed because the above
876 * bpf_map_alloc_id() has published the map
877 * to the userspace and the userspace may
878 * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
879 */
880 bpf_map_put_with_uref(map);
881 return err;
882 }
883
884 return err;
885
886 free_map_sec:
887 security_bpf_map_free(map);
888 free_map:
889 btf_put(map->btf);
890 bpf_map_charge_move(&mem, &map->memory);
891 map->ops->map_free(map);
892 bpf_map_charge_finish(&mem);
893 return err;
894 }
895
896 /* if error is returned, fd is released.
897 * On success caller should complete fd access with matching fdput()
898 */
899 struct bpf_map *__bpf_map_get(struct fd f)
900 {
901 if (!f.file)
902 return ERR_PTR(-EBADF);
903 if (f.file->f_op != &bpf_map_fops) {
904 fdput(f);
905 return ERR_PTR(-EINVAL);
906 }
907
908 return f.file->private_data;
909 }
910
911 void bpf_map_inc(struct bpf_map *map)
912 {
913 atomic64_inc(&map->refcnt);
914 }
915 EXPORT_SYMBOL_GPL(bpf_map_inc);
916
917 void bpf_map_inc_with_uref(struct bpf_map *map)
918 {
919 atomic64_inc(&map->refcnt);
920 atomic64_inc(&map->usercnt);
921 }
922 EXPORT_SYMBOL_GPL(bpf_map_inc_with_uref);
923
924 struct bpf_map *bpf_map_get(u32 ufd)
925 {
926 struct fd f = fdget(ufd);
927 struct bpf_map *map;
928
929 map = __bpf_map_get(f);
930 if (IS_ERR(map))
931 return map;
932
933 bpf_map_inc(map);
934 fdput(f);
935
936 return map;
937 }
938
939 struct bpf_map *bpf_map_get_with_uref(u32 ufd)
940 {
941 struct fd f = fdget(ufd);
942 struct bpf_map *map;
943
944 map = __bpf_map_get(f);
945 if (IS_ERR(map))
946 return map;
947
948 bpf_map_inc_with_uref(map);
949 fdput(f);
950
951 return map;
952 }
953
954 /* map_idr_lock should have been held */
955 static struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref)
956 {
957 int refold;
958
959 refold = atomic64_fetch_add_unless(&map->refcnt, 1, 0);
960 if (!refold)
961 return ERR_PTR(-ENOENT);
962 if (uref)
963 atomic64_inc(&map->usercnt);
964
965 return map;
966 }
967
968 struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map)
969 {
970 spin_lock_bh(&map_idr_lock);
971 map = __bpf_map_inc_not_zero(map, false);
972 spin_unlock_bh(&map_idr_lock);
973
974 return map;
975 }
976 EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero);
977
978 int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
979 {
980 return -ENOTSUPP;
981 }
982
983 static void *__bpf_copy_key(void __user *ukey, u64 key_size)
984 {
985 if (key_size)
986 return memdup_user(ukey, key_size);
987
988 if (ukey)
989 return ERR_PTR(-EINVAL);
990
991 return NULL;
992 }
993
994 /* last field in 'union bpf_attr' used by this command */
995 #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
996
997 static int map_lookup_elem(union bpf_attr *attr)
998 {
999 void __user *ukey = u64_to_user_ptr(attr->key);
1000 void __user *uvalue = u64_to_user_ptr(attr->value);
1001 int ufd = attr->map_fd;
1002 struct bpf_map *map;
1003 void *key, *value;
1004 u32 value_size;
1005 struct fd f;
1006 int err;
1007
1008 if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
1009 return -EINVAL;
1010
1011 if (attr->flags & ~BPF_F_LOCK)
1012 return -EINVAL;
1013
1014 f = fdget(ufd);
1015 map = __bpf_map_get(f);
1016 if (IS_ERR(map))
1017 return PTR_ERR(map);
1018 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
1019 err = -EPERM;
1020 goto err_put;
1021 }
1022
1023 if ((attr->flags & BPF_F_LOCK) &&
1024 !map_value_has_spin_lock(map)) {
1025 err = -EINVAL;
1026 goto err_put;
1027 }
1028
1029 key = __bpf_copy_key(ukey, map->key_size);
1030 if (IS_ERR(key)) {
1031 err = PTR_ERR(key);
1032 goto err_put;
1033 }
1034
1035 value_size = bpf_map_value_size(map);
1036
1037 err = -ENOMEM;
1038 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
1039 if (!value)
1040 goto free_key;
1041
1042 err = bpf_map_copy_value(map, key, value, attr->flags);
1043 if (err)
1044 goto free_value;
1045
1046 err = -EFAULT;
1047 if (copy_to_user(uvalue, value, value_size) != 0)
1048 goto free_value;
1049
1050 err = 0;
1051
1052 free_value:
1053 kfree(value);
1054 free_key:
1055 kfree(key);
1056 err_put:
1057 fdput(f);
1058 return err;
1059 }
1060
1061
1062 #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
1063
1064 static int map_update_elem(union bpf_attr *attr)
1065 {
1066 void __user *ukey = u64_to_user_ptr(attr->key);
1067 void __user *uvalue = u64_to_user_ptr(attr->value);
1068 int ufd = attr->map_fd;
1069 struct bpf_map *map;
1070 void *key, *value;
1071 u32 value_size;
1072 struct fd f;
1073 int err;
1074
1075 if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
1076 return -EINVAL;
1077
1078 f = fdget(ufd);
1079 map = __bpf_map_get(f);
1080 if (IS_ERR(map))
1081 return PTR_ERR(map);
1082 if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1083 err = -EPERM;
1084 goto err_put;
1085 }
1086
1087 if ((attr->flags & BPF_F_LOCK) &&
1088 !map_value_has_spin_lock(map)) {
1089 err = -EINVAL;
1090 goto err_put;
1091 }
1092
1093 key = __bpf_copy_key(ukey, map->key_size);
1094 if (IS_ERR(key)) {
1095 err = PTR_ERR(key);
1096 goto err_put;
1097 }
1098
1099 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
1100 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
1101 map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
1102 map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
1103 value_size = round_up(map->value_size, 8) * num_possible_cpus();
1104 else
1105 value_size = map->value_size;
1106
1107 err = -ENOMEM;
1108 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
1109 if (!value)
1110 goto free_key;
1111
1112 err = -EFAULT;
1113 if (copy_from_user(value, uvalue, value_size) != 0)
1114 goto free_value;
1115
1116 err = bpf_map_update_value(map, f, key, value, attr->flags);
1117
1118 free_value:
1119 kfree(value);
1120 free_key:
1121 kfree(key);
1122 err_put:
1123 fdput(f);
1124 return err;
1125 }
1126
1127 #define BPF_MAP_DELETE_ELEM_LAST_FIELD key
1128
1129 static int map_delete_elem(union bpf_attr *attr)
1130 {
1131 void __user *ukey = u64_to_user_ptr(attr->key);
1132 int ufd = attr->map_fd;
1133 struct bpf_map *map;
1134 struct fd f;
1135 void *key;
1136 int err;
1137
1138 if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
1139 return -EINVAL;
1140
1141 f = fdget(ufd);
1142 map = __bpf_map_get(f);
1143 if (IS_ERR(map))
1144 return PTR_ERR(map);
1145 if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1146 err = -EPERM;
1147 goto err_put;
1148 }
1149
1150 key = __bpf_copy_key(ukey, map->key_size);
1151 if (IS_ERR(key)) {
1152 err = PTR_ERR(key);
1153 goto err_put;
1154 }
1155
1156 if (bpf_map_is_dev_bound(map)) {
1157 err = bpf_map_offload_delete_elem(map, key);
1158 goto out;
1159 } else if (IS_FD_PROG_ARRAY(map) ||
1160 map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
1161 /* These maps require sleepable context */
1162 err = map->ops->map_delete_elem(map, key);
1163 goto out;
1164 }
1165
1166 bpf_disable_instrumentation();
1167 rcu_read_lock();
1168 err = map->ops->map_delete_elem(map, key);
1169 rcu_read_unlock();
1170 bpf_enable_instrumentation();
1171 maybe_wait_bpf_programs(map);
1172 out:
1173 kfree(key);
1174 err_put:
1175 fdput(f);
1176 return err;
1177 }
1178
1179 /* last field in 'union bpf_attr' used by this command */
1180 #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
1181
1182 static int map_get_next_key(union bpf_attr *attr)
1183 {
1184 void __user *ukey = u64_to_user_ptr(attr->key);
1185 void __user *unext_key = u64_to_user_ptr(attr->next_key);
1186 int ufd = attr->map_fd;
1187 struct bpf_map *map;
1188 void *key, *next_key;
1189 struct fd f;
1190 int err;
1191
1192 if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
1193 return -EINVAL;
1194
1195 f = fdget(ufd);
1196 map = __bpf_map_get(f);
1197 if (IS_ERR(map))
1198 return PTR_ERR(map);
1199 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
1200 err = -EPERM;
1201 goto err_put;
1202 }
1203
1204 if (ukey) {
1205 key = __bpf_copy_key(ukey, map->key_size);
1206 if (IS_ERR(key)) {
1207 err = PTR_ERR(key);
1208 goto err_put;
1209 }
1210 } else {
1211 key = NULL;
1212 }
1213
1214 err = -ENOMEM;
1215 next_key = kmalloc(map->key_size, GFP_USER);
1216 if (!next_key)
1217 goto free_key;
1218
1219 if (bpf_map_is_dev_bound(map)) {
1220 err = bpf_map_offload_get_next_key(map, key, next_key);
1221 goto out;
1222 }
1223
1224 rcu_read_lock();
1225 err = map->ops->map_get_next_key(map, key, next_key);
1226 rcu_read_unlock();
1227 out:
1228 if (err)
1229 goto free_next_key;
1230
1231 err = -EFAULT;
1232 if (copy_to_user(unext_key, next_key, map->key_size) != 0)
1233 goto free_next_key;
1234
1235 err = 0;
1236
1237 free_next_key:
1238 kfree(next_key);
1239 free_key:
1240 kfree(key);
1241 err_put:
1242 fdput(f);
1243 return err;
1244 }
1245
1246 int generic_map_delete_batch(struct bpf_map *map,
1247 const union bpf_attr *attr,
1248 union bpf_attr __user *uattr)
1249 {
1250 void __user *keys = u64_to_user_ptr(attr->batch.keys);
1251 u32 cp, max_count;
1252 int err = 0;
1253 void *key;
1254
1255 if (attr->batch.elem_flags & ~BPF_F_LOCK)
1256 return -EINVAL;
1257
1258 if ((attr->batch.elem_flags & BPF_F_LOCK) &&
1259 !map_value_has_spin_lock(map)) {
1260 return -EINVAL;
1261 }
1262
1263 max_count = attr->batch.count;
1264 if (!max_count)
1265 return 0;
1266
1267 key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
1268 if (!key)
1269 return -ENOMEM;
1270
1271 for (cp = 0; cp < max_count; cp++) {
1272 err = -EFAULT;
1273 if (copy_from_user(key, keys + cp * map->key_size,
1274 map->key_size))
1275 break;
1276
1277 if (bpf_map_is_dev_bound(map)) {
1278 err = bpf_map_offload_delete_elem(map, key);
1279 break;
1280 }
1281
1282 bpf_disable_instrumentation();
1283 rcu_read_lock();
1284 err = map->ops->map_delete_elem(map, key);
1285 rcu_read_unlock();
1286 bpf_enable_instrumentation();
1287 maybe_wait_bpf_programs(map);
1288 if (err)
1289 break;
1290 }
1291 if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
1292 err = -EFAULT;
1293
1294 kfree(key);
1295 return err;
1296 }
1297
1298 int generic_map_update_batch(struct bpf_map *map,
1299 const union bpf_attr *attr,
1300 union bpf_attr __user *uattr)
1301 {
1302 void __user *values = u64_to_user_ptr(attr->batch.values);
1303 void __user *keys = u64_to_user_ptr(attr->batch.keys);
1304 u32 value_size, cp, max_count;
1305 int ufd = attr->map_fd;
1306 void *key, *value;
1307 struct fd f;
1308 int err = 0;
1309
1310 f = fdget(ufd);
1311 if (attr->batch.elem_flags & ~BPF_F_LOCK)
1312 return -EINVAL;
1313
1314 if ((attr->batch.elem_flags & BPF_F_LOCK) &&
1315 !map_value_has_spin_lock(map)) {
1316 return -EINVAL;
1317 }
1318
1319 value_size = bpf_map_value_size(map);
1320
1321 max_count = attr->batch.count;
1322 if (!max_count)
1323 return 0;
1324
1325 key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
1326 if (!key)
1327 return -ENOMEM;
1328
1329 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
1330 if (!value) {
1331 kfree(key);
1332 return -ENOMEM;
1333 }
1334
1335 for (cp = 0; cp < max_count; cp++) {
1336 err = -EFAULT;
1337 if (copy_from_user(key, keys + cp * map->key_size,
1338 map->key_size) ||
1339 copy_from_user(value, values + cp * value_size, value_size))
1340 break;
1341
1342 err = bpf_map_update_value(map, f, key, value,
1343 attr->batch.elem_flags);
1344
1345 if (err)
1346 break;
1347 }
1348
1349 if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
1350 err = -EFAULT;
1351
1352 kfree(value);
1353 kfree(key);
1354 return err;
1355 }
1356
1357 #define MAP_LOOKUP_RETRIES 3
1358
1359 int generic_map_lookup_batch(struct bpf_map *map,
1360 const union bpf_attr *attr,
1361 union bpf_attr __user *uattr)
1362 {
1363 void __user *uobatch = u64_to_user_ptr(attr->batch.out_batch);
1364 void __user *ubatch = u64_to_user_ptr(attr->batch.in_batch);
1365 void __user *values = u64_to_user_ptr(attr->batch.values);
1366 void __user *keys = u64_to_user_ptr(attr->batch.keys);
1367 void *buf, *buf_prevkey, *prev_key, *key, *value;
1368 int err, retry = MAP_LOOKUP_RETRIES;
1369 u32 value_size, cp, max_count;
1370
1371 if (attr->batch.elem_flags & ~BPF_F_LOCK)
1372 return -EINVAL;
1373
1374 if ((attr->batch.elem_flags & BPF_F_LOCK) &&
1375 !map_value_has_spin_lock(map))
1376 return -EINVAL;
1377
1378 value_size = bpf_map_value_size(map);
1379
1380 max_count = attr->batch.count;
1381 if (!max_count)
1382 return 0;
1383
1384 if (put_user(0, &uattr->batch.count))
1385 return -EFAULT;
1386
1387 buf_prevkey = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
1388 if (!buf_prevkey)
1389 return -ENOMEM;
1390
1391 buf = kmalloc(map->key_size + value_size, GFP_USER | __GFP_NOWARN);
1392 if (!buf) {
1393 kfree(buf_prevkey);
1394 return -ENOMEM;
1395 }
1396
1397 err = -EFAULT;
1398 prev_key = NULL;
1399 if (ubatch && copy_from_user(buf_prevkey, ubatch, map->key_size))
1400 goto free_buf;
1401 key = buf;
1402 value = key + map->key_size;
1403 if (ubatch)
1404 prev_key = buf_prevkey;
1405
1406 for (cp = 0; cp < max_count;) {
1407 rcu_read_lock();
1408 err = map->ops->map_get_next_key(map, prev_key, key);
1409 rcu_read_unlock();
1410 if (err)
1411 break;
1412 err = bpf_map_copy_value(map, key, value,
1413 attr->batch.elem_flags);
1414
1415 if (err == -ENOENT) {
1416 if (retry) {
1417 retry--;
1418 continue;
1419 }
1420 err = -EINTR;
1421 break;
1422 }
1423
1424 if (err)
1425 goto free_buf;
1426
1427 if (copy_to_user(keys + cp * map->key_size, key,
1428 map->key_size)) {
1429 err = -EFAULT;
1430 goto free_buf;
1431 }
1432 if (copy_to_user(values + cp * value_size, value, value_size)) {
1433 err = -EFAULT;
1434 goto free_buf;
1435 }
1436
1437 if (!prev_key)
1438 prev_key = buf_prevkey;
1439
1440 swap(prev_key, key);
1441 retry = MAP_LOOKUP_RETRIES;
1442 cp++;
1443 }
1444
1445 if (err == -EFAULT)
1446 goto free_buf;
1447
1448 if ((copy_to_user(&uattr->batch.count, &cp, sizeof(cp)) ||
1449 (cp && copy_to_user(uobatch, prev_key, map->key_size))))
1450 err = -EFAULT;
1451
1452 free_buf:
1453 kfree(buf_prevkey);
1454 kfree(buf);
1455 return err;
1456 }
1457
1458 #define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value
1459
1460 static int map_lookup_and_delete_elem(union bpf_attr *attr)
1461 {
1462 void __user *ukey = u64_to_user_ptr(attr->key);
1463 void __user *uvalue = u64_to_user_ptr(attr->value);
1464 int ufd = attr->map_fd;
1465 struct bpf_map *map;
1466 void *key, *value;
1467 u32 value_size;
1468 struct fd f;
1469 int err;
1470
1471 if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM))
1472 return -EINVAL;
1473
1474 f = fdget(ufd);
1475 map = __bpf_map_get(f);
1476 if (IS_ERR(map))
1477 return PTR_ERR(map);
1478 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ) ||
1479 !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1480 err = -EPERM;
1481 goto err_put;
1482 }
1483
1484 key = __bpf_copy_key(ukey, map->key_size);
1485 if (IS_ERR(key)) {
1486 err = PTR_ERR(key);
1487 goto err_put;
1488 }
1489
1490 value_size = map->value_size;
1491
1492 err = -ENOMEM;
1493 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
1494 if (!value)
1495 goto free_key;
1496
1497 if (map->map_type == BPF_MAP_TYPE_QUEUE ||
1498 map->map_type == BPF_MAP_TYPE_STACK) {
1499 err = map->ops->map_pop_elem(map, value);
1500 } else {
1501 err = -ENOTSUPP;
1502 }
1503
1504 if (err)
1505 goto free_value;
1506
1507 if (copy_to_user(uvalue, value, value_size) != 0) {
1508 err = -EFAULT;
1509 goto free_value;
1510 }
1511
1512 err = 0;
1513
1514 free_value:
1515 kfree(value);
1516 free_key:
1517 kfree(key);
1518 err_put:
1519 fdput(f);
1520 return err;
1521 }
1522
1523 #define BPF_MAP_FREEZE_LAST_FIELD map_fd
1524
1525 static int map_freeze(const union bpf_attr *attr)
1526 {
1527 int err = 0, ufd = attr->map_fd;
1528 struct bpf_map *map;
1529 struct fd f;
1530
1531 if (CHECK_ATTR(BPF_MAP_FREEZE))
1532 return -EINVAL;
1533
1534 f = fdget(ufd);
1535 map = __bpf_map_get(f);
1536 if (IS_ERR(map))
1537 return PTR_ERR(map);
1538
1539 if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
1540 fdput(f);
1541 return -ENOTSUPP;
1542 }
1543
1544 mutex_lock(&map->freeze_mutex);
1545
1546 if (map->writecnt) {
1547 err = -EBUSY;
1548 goto err_put;
1549 }
1550 if (READ_ONCE(map->frozen)) {
1551 err = -EBUSY;
1552 goto err_put;
1553 }
1554 if (!bpf_capable()) {
1555 err = -EPERM;
1556 goto err_put;
1557 }
1558
1559 WRITE_ONCE(map->frozen, true);
1560 err_put:
1561 mutex_unlock(&map->freeze_mutex);
1562 fdput(f);
1563 return err;
1564 }
1565
1566 static const struct bpf_prog_ops * const bpf_prog_types[] = {
1567 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1568 [_id] = & _name ## _prog_ops,
1569 #define BPF_MAP_TYPE(_id, _ops)
1570 #define BPF_LINK_TYPE(_id, _name)
1571 #include <linux/bpf_types.h>
1572 #undef BPF_PROG_TYPE
1573 #undef BPF_MAP_TYPE
1574 #undef BPF_LINK_TYPE
1575 };
1576
1577 static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
1578 {
1579 const struct bpf_prog_ops *ops;
1580
1581 if (type >= ARRAY_SIZE(bpf_prog_types))
1582 return -EINVAL;
1583 type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
1584 ops = bpf_prog_types[type];
1585 if (!ops)
1586 return -EINVAL;
1587
1588 if (!bpf_prog_is_dev_bound(prog->aux))
1589 prog->aux->ops = ops;
1590 else
1591 prog->aux->ops = &bpf_offload_prog_ops;
1592 prog->type = type;
1593 return 0;
1594 }
1595
1596 enum bpf_audit {
1597 BPF_AUDIT_LOAD,
1598 BPF_AUDIT_UNLOAD,
1599 BPF_AUDIT_MAX,
1600 };
1601
1602 static const char * const bpf_audit_str[BPF_AUDIT_MAX] = {
1603 [BPF_AUDIT_LOAD] = "LOAD",
1604 [BPF_AUDIT_UNLOAD] = "UNLOAD",
1605 };
1606
1607 static void bpf_audit_prog(const struct bpf_prog *prog, unsigned int op)
1608 {
1609 struct audit_context *ctx = NULL;
1610 struct audit_buffer *ab;
1611
1612 if (WARN_ON_ONCE(op >= BPF_AUDIT_MAX))
1613 return;
1614 if (audit_enabled == AUDIT_OFF)
1615 return;
1616 if (op == BPF_AUDIT_LOAD)
1617 ctx = audit_context();
1618 ab = audit_log_start(ctx, GFP_ATOMIC, AUDIT_BPF);
1619 if (unlikely(!ab))
1620 return;
1621 audit_log_format(ab, "prog-id=%u op=%s",
1622 prog->aux->id, bpf_audit_str[op]);
1623 audit_log_end(ab);
1624 }
1625
1626 int __bpf_prog_charge(struct user_struct *user, u32 pages)
1627 {
1628 unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
1629 unsigned long user_bufs;
1630
1631 if (user) {
1632 user_bufs = atomic_long_add_return(pages, &user->locked_vm);
1633 if (user_bufs > memlock_limit) {
1634 atomic_long_sub(pages, &user->locked_vm);
1635 return -EPERM;
1636 }
1637 }
1638
1639 return 0;
1640 }
1641
1642 void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1643 {
1644 if (user)
1645 atomic_long_sub(pages, &user->locked_vm);
1646 }
1647
1648 static int bpf_prog_charge_memlock(struct bpf_prog *prog)
1649 {
1650 struct user_struct *user = get_current_user();
1651 int ret;
1652
1653 ret = __bpf_prog_charge(user, prog->pages);
1654 if (ret) {
1655 free_uid(user);
1656 return ret;
1657 }
1658
1659 prog->aux->user = user;
1660 return 0;
1661 }
1662
1663 static void bpf_prog_uncharge_memlock(struct bpf_prog *prog)
1664 {
1665 struct user_struct *user = prog->aux->user;
1666
1667 __bpf_prog_uncharge(user, prog->pages);
1668 free_uid(user);
1669 }
1670
1671 static int bpf_prog_alloc_id(struct bpf_prog *prog)
1672 {
1673 int id;
1674
1675 idr_preload(GFP_KERNEL);
1676 spin_lock_bh(&prog_idr_lock);
1677 id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
1678 if (id > 0)
1679 prog->aux->id = id;
1680 spin_unlock_bh(&prog_idr_lock);
1681 idr_preload_end();
1682
1683 /* id is in [1, INT_MAX) */
1684 if (WARN_ON_ONCE(!id))
1685 return -ENOSPC;
1686
1687 return id > 0 ? 0 : id;
1688 }
1689
1690 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock)
1691 {
1692 /* cBPF to eBPF migrations are currently not in the idr store.
1693 * Offloaded programs are removed from the store when their device
1694 * disappears - even if someone grabs an fd to them they are unusable,
1695 * simply waiting for refcnt to drop to be freed.
1696 */
1697 if (!prog->aux->id)
1698 return;
1699
1700 if (do_idr_lock)
1701 spin_lock_bh(&prog_idr_lock);
1702 else
1703 __acquire(&prog_idr_lock);
1704
1705 idr_remove(&prog_idr, prog->aux->id);
1706 prog->aux->id = 0;
1707
1708 if (do_idr_lock)
1709 spin_unlock_bh(&prog_idr_lock);
1710 else
1711 __release(&prog_idr_lock);
1712 }
1713
1714 static void __bpf_prog_put_rcu(struct rcu_head *rcu)
1715 {
1716 struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
1717
1718 kvfree(aux->func_info);
1719 kfree(aux->func_info_aux);
1720 bpf_prog_uncharge_memlock(aux->prog);
1721 security_bpf_prog_free(aux);
1722 bpf_prog_free(aux->prog);
1723 }
1724
1725 static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
1726 {
1727 bpf_prog_kallsyms_del_all(prog);
1728 btf_put(prog->aux->btf);
1729 bpf_prog_free_linfo(prog);
1730
1731 if (deferred)
1732 call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
1733 else
1734 __bpf_prog_put_rcu(&prog->aux->rcu);
1735 }
1736
1737 static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
1738 {
1739 if (atomic64_dec_and_test(&prog->aux->refcnt)) {
1740 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
1741 bpf_audit_prog(prog, BPF_AUDIT_UNLOAD);
1742 /* bpf_prog_free_id() must be called first */
1743 bpf_prog_free_id(prog, do_idr_lock);
1744 __bpf_prog_put_noref(prog, true);
1745 }
1746 }
1747
1748 void bpf_prog_put(struct bpf_prog *prog)
1749 {
1750 __bpf_prog_put(prog, true);
1751 }
1752 EXPORT_SYMBOL_GPL(bpf_prog_put);
1753
1754 static int bpf_prog_release(struct inode *inode, struct file *filp)
1755 {
1756 struct bpf_prog *prog = filp->private_data;
1757
1758 bpf_prog_put(prog);
1759 return 0;
1760 }
1761
1762 static void bpf_prog_get_stats(const struct bpf_prog *prog,
1763 struct bpf_prog_stats *stats)
1764 {
1765 u64 nsecs = 0, cnt = 0;
1766 int cpu;
1767
1768 for_each_possible_cpu(cpu) {
1769 const struct bpf_prog_stats *st;
1770 unsigned int start;
1771 u64 tnsecs, tcnt;
1772
1773 st = per_cpu_ptr(prog->aux->stats, cpu);
1774 do {
1775 start = u64_stats_fetch_begin_irq(&st->syncp);
1776 tnsecs = st->nsecs;
1777 tcnt = st->cnt;
1778 } while (u64_stats_fetch_retry_irq(&st->syncp, start));
1779 nsecs += tnsecs;
1780 cnt += tcnt;
1781 }
1782 stats->nsecs = nsecs;
1783 stats->cnt = cnt;
1784 }
1785
1786 #ifdef CONFIG_PROC_FS
1787 static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
1788 {
1789 const struct bpf_prog *prog = filp->private_data;
1790 char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
1791 struct bpf_prog_stats stats;
1792
1793 bpf_prog_get_stats(prog, &stats);
1794 bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
1795 seq_printf(m,
1796 "prog_type:\t%u\n"
1797 "prog_jited:\t%u\n"
1798 "prog_tag:\t%s\n"
1799 "memlock:\t%llu\n"
1800 "prog_id:\t%u\n"
1801 "run_time_ns:\t%llu\n"
1802 "run_cnt:\t%llu\n",
1803 prog->type,
1804 prog->jited,
1805 prog_tag,
1806 prog->pages * 1ULL << PAGE_SHIFT,
1807 prog->aux->id,
1808 stats.nsecs,
1809 stats.cnt);
1810 }
1811 #endif
1812
1813 const struct file_operations bpf_prog_fops = {
1814 #ifdef CONFIG_PROC_FS
1815 .show_fdinfo = bpf_prog_show_fdinfo,
1816 #endif
1817 .release = bpf_prog_release,
1818 .read = bpf_dummy_read,
1819 .write = bpf_dummy_write,
1820 };
1821
1822 int bpf_prog_new_fd(struct bpf_prog *prog)
1823 {
1824 int ret;
1825
1826 ret = security_bpf_prog(prog);
1827 if (ret < 0)
1828 return ret;
1829
1830 return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
1831 O_RDWR | O_CLOEXEC);
1832 }
1833
1834 static struct bpf_prog *____bpf_prog_get(struct fd f)
1835 {
1836 if (!f.file)
1837 return ERR_PTR(-EBADF);
1838 if (f.file->f_op != &bpf_prog_fops) {
1839 fdput(f);
1840 return ERR_PTR(-EINVAL);
1841 }
1842
1843 return f.file->private_data;
1844 }
1845
1846 void bpf_prog_add(struct bpf_prog *prog, int i)
1847 {
1848 atomic64_add(i, &prog->aux->refcnt);
1849 }
1850 EXPORT_SYMBOL_GPL(bpf_prog_add);
1851
1852 void bpf_prog_sub(struct bpf_prog *prog, int i)
1853 {
1854 /* Only to be used for undoing previous bpf_prog_add() in some
1855 * error path. We still know that another entity in our call
1856 * path holds a reference to the program, thus atomic_sub() can
1857 * be safely used in such cases!
1858 */
1859 WARN_ON(atomic64_sub_return(i, &prog->aux->refcnt) == 0);
1860 }
1861 EXPORT_SYMBOL_GPL(bpf_prog_sub);
1862
1863 void bpf_prog_inc(struct bpf_prog *prog)
1864 {
1865 atomic64_inc(&prog->aux->refcnt);
1866 }
1867 EXPORT_SYMBOL_GPL(bpf_prog_inc);
1868
1869 /* prog_idr_lock should have been held */
1870 struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
1871 {
1872 int refold;
1873
1874 refold = atomic64_fetch_add_unless(&prog->aux->refcnt, 1, 0);
1875
1876 if (!refold)
1877 return ERR_PTR(-ENOENT);
1878
1879 return prog;
1880 }
1881 EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
1882
1883 bool bpf_prog_get_ok(struct bpf_prog *prog,
1884 enum bpf_prog_type *attach_type, bool attach_drv)
1885 {
1886 /* not an attachment, just a refcount inc, always allow */
1887 if (!attach_type)
1888 return true;
1889
1890 if (prog->type != *attach_type)
1891 return false;
1892 if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv)
1893 return false;
1894
1895 return true;
1896 }
1897
1898 static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
1899 bool attach_drv)
1900 {
1901 struct fd f = fdget(ufd);
1902 struct bpf_prog *prog;
1903
1904 prog = ____bpf_prog_get(f);
1905 if (IS_ERR(prog))
1906 return prog;
1907 if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
1908 prog = ERR_PTR(-EINVAL);
1909 goto out;
1910 }
1911
1912 bpf_prog_inc(prog);
1913 out:
1914 fdput(f);
1915 return prog;
1916 }
1917
1918 struct bpf_prog *bpf_prog_get(u32 ufd)
1919 {
1920 return __bpf_prog_get(ufd, NULL, false);
1921 }
1922
1923 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1924 bool attach_drv)
1925 {
1926 return __bpf_prog_get(ufd, &type, attach_drv);
1927 }
1928 EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
1929
1930 /* Initially all BPF programs could be loaded w/o specifying
1931 * expected_attach_type. Later for some of them specifying expected_attach_type
1932 * at load time became required so that program could be validated properly.
1933 * Programs of types that are allowed to be loaded both w/ and w/o (for
1934 * backward compatibility) expected_attach_type, should have the default attach
1935 * type assigned to expected_attach_type for the latter case, so that it can be
1936 * validated later at attach time.
1937 *
1938 * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
1939 * prog type requires it but has some attach types that have to be backward
1940 * compatible.
1941 */
1942 static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
1943 {
1944 switch (attr->prog_type) {
1945 case BPF_PROG_TYPE_CGROUP_SOCK:
1946 /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
1947 * exist so checking for non-zero is the way to go here.
1948 */
1949 if (!attr->expected_attach_type)
1950 attr->expected_attach_type =
1951 BPF_CGROUP_INET_SOCK_CREATE;
1952 break;
1953 }
1954 }
1955
1956 static int
1957 bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
1958 enum bpf_attach_type expected_attach_type,
1959 u32 btf_id, u32 prog_fd)
1960 {
1961 if (btf_id) {
1962 if (btf_id > BTF_MAX_TYPE)
1963 return -EINVAL;
1964
1965 switch (prog_type) {
1966 case BPF_PROG_TYPE_TRACING:
1967 case BPF_PROG_TYPE_LSM:
1968 case BPF_PROG_TYPE_STRUCT_OPS:
1969 case BPF_PROG_TYPE_EXT:
1970 break;
1971 default:
1972 return -EINVAL;
1973 }
1974 }
1975
1976 if (prog_fd && prog_type != BPF_PROG_TYPE_TRACING &&
1977 prog_type != BPF_PROG_TYPE_EXT)
1978 return -EINVAL;
1979
1980 switch (prog_type) {
1981 case BPF_PROG_TYPE_CGROUP_SOCK:
1982 switch (expected_attach_type) {
1983 case BPF_CGROUP_INET_SOCK_CREATE:
1984 case BPF_CGROUP_INET_SOCK_RELEASE:
1985 case BPF_CGROUP_INET4_POST_BIND:
1986 case BPF_CGROUP_INET6_POST_BIND:
1987 return 0;
1988 default:
1989 return -EINVAL;
1990 }
1991 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1992 switch (expected_attach_type) {
1993 case BPF_CGROUP_INET4_BIND:
1994 case BPF_CGROUP_INET6_BIND:
1995 case BPF_CGROUP_INET4_CONNECT:
1996 case BPF_CGROUP_INET6_CONNECT:
1997 case BPF_CGROUP_INET4_GETPEERNAME:
1998 case BPF_CGROUP_INET6_GETPEERNAME:
1999 case BPF_CGROUP_INET4_GETSOCKNAME:
2000 case BPF_CGROUP_INET6_GETSOCKNAME:
2001 case BPF_CGROUP_UDP4_SENDMSG:
2002 case BPF_CGROUP_UDP6_SENDMSG:
2003 case BPF_CGROUP_UDP4_RECVMSG:
2004 case BPF_CGROUP_UDP6_RECVMSG:
2005 return 0;
2006 default:
2007 return -EINVAL;
2008 }
2009 case BPF_PROG_TYPE_CGROUP_SKB:
2010 switch (expected_attach_type) {
2011 case BPF_CGROUP_INET_INGRESS:
2012 case BPF_CGROUP_INET_EGRESS:
2013 return 0;
2014 default:
2015 return -EINVAL;
2016 }
2017 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2018 switch (expected_attach_type) {
2019 case BPF_CGROUP_SETSOCKOPT:
2020 case BPF_CGROUP_GETSOCKOPT:
2021 return 0;
2022 default:
2023 return -EINVAL;
2024 }
2025 case BPF_PROG_TYPE_SK_LOOKUP:
2026 if (expected_attach_type == BPF_SK_LOOKUP)
2027 return 0;
2028 return -EINVAL;
2029 case BPF_PROG_TYPE_EXT:
2030 if (expected_attach_type)
2031 return -EINVAL;
2032 /* fallthrough */
2033 default:
2034 return 0;
2035 }
2036 }
2037
2038 static bool is_net_admin_prog_type(enum bpf_prog_type prog_type)
2039 {
2040 switch (prog_type) {
2041 case BPF_PROG_TYPE_SCHED_CLS:
2042 case BPF_PROG_TYPE_SCHED_ACT:
2043 case BPF_PROG_TYPE_XDP:
2044 case BPF_PROG_TYPE_LWT_IN:
2045 case BPF_PROG_TYPE_LWT_OUT:
2046 case BPF_PROG_TYPE_LWT_XMIT:
2047 case BPF_PROG_TYPE_LWT_SEG6LOCAL:
2048 case BPF_PROG_TYPE_SK_SKB:
2049 case BPF_PROG_TYPE_SK_MSG:
2050 case BPF_PROG_TYPE_LIRC_MODE2:
2051 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2052 case BPF_PROG_TYPE_CGROUP_DEVICE:
2053 case BPF_PROG_TYPE_CGROUP_SOCK:
2054 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2055 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2056 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2057 case BPF_PROG_TYPE_SOCK_OPS:
2058 case BPF_PROG_TYPE_EXT: /* extends any prog */
2059 return true;
2060 case BPF_PROG_TYPE_CGROUP_SKB:
2061 /* always unpriv */
2062 case BPF_PROG_TYPE_SK_REUSEPORT:
2063 /* equivalent to SOCKET_FILTER. need CAP_BPF only */
2064 default:
2065 return false;
2066 }
2067 }
2068
2069 static bool is_perfmon_prog_type(enum bpf_prog_type prog_type)
2070 {
2071 switch (prog_type) {
2072 case BPF_PROG_TYPE_KPROBE:
2073 case BPF_PROG_TYPE_TRACEPOINT:
2074 case BPF_PROG_TYPE_PERF_EVENT:
2075 case BPF_PROG_TYPE_RAW_TRACEPOINT:
2076 case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
2077 case BPF_PROG_TYPE_TRACING:
2078 case BPF_PROG_TYPE_LSM:
2079 case BPF_PROG_TYPE_STRUCT_OPS: /* has access to struct sock */
2080 case BPF_PROG_TYPE_EXT: /* extends any prog */
2081 return true;
2082 default:
2083 return false;
2084 }
2085 }
2086
2087 /* last field in 'union bpf_attr' used by this command */
2088 #define BPF_PROG_LOAD_LAST_FIELD attach_prog_fd
2089
2090 static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
2091 {
2092 enum bpf_prog_type type = attr->prog_type;
2093 struct bpf_prog *prog;
2094 int err;
2095 char license[128];
2096 bool is_gpl;
2097
2098 if (CHECK_ATTR(BPF_PROG_LOAD))
2099 return -EINVAL;
2100
2101 if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
2102 BPF_F_ANY_ALIGNMENT |
2103 BPF_F_TEST_STATE_FREQ |
2104 BPF_F_TEST_RND_HI32))
2105 return -EINVAL;
2106
2107 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
2108 (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
2109 !bpf_capable())
2110 return -EPERM;
2111
2112 /* copy eBPF program license from user space */
2113 if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
2114 sizeof(license) - 1) < 0)
2115 return -EFAULT;
2116 license[sizeof(license) - 1] = 0;
2117
2118 /* eBPF programs must be GPL compatible to use GPL-ed functions */
2119 is_gpl = license_is_gpl_compatible(license);
2120
2121 if (attr->insn_cnt == 0 ||
2122 attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
2123 return -E2BIG;
2124 if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
2125 type != BPF_PROG_TYPE_CGROUP_SKB &&
2126 !bpf_capable())
2127 return -EPERM;
2128
2129 if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN) && !capable(CAP_SYS_ADMIN))
2130 return -EPERM;
2131 if (is_perfmon_prog_type(type) && !perfmon_capable())
2132 return -EPERM;
2133
2134 bpf_prog_load_fixup_attach_type(attr);
2135 if (bpf_prog_load_check_attach(type, attr->expected_attach_type,
2136 attr->attach_btf_id,
2137 attr->attach_prog_fd))
2138 return -EINVAL;
2139
2140 /* plain bpf_prog allocation */
2141 prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
2142 if (!prog)
2143 return -ENOMEM;
2144
2145 prog->expected_attach_type = attr->expected_attach_type;
2146 prog->aux->attach_btf_id = attr->attach_btf_id;
2147 if (attr->attach_prog_fd) {
2148 struct bpf_prog *tgt_prog;
2149
2150 tgt_prog = bpf_prog_get(attr->attach_prog_fd);
2151 if (IS_ERR(tgt_prog)) {
2152 err = PTR_ERR(tgt_prog);
2153 goto free_prog_nouncharge;
2154 }
2155 prog->aux->linked_prog = tgt_prog;
2156 }
2157
2158 prog->aux->offload_requested = !!attr->prog_ifindex;
2159
2160 err = security_bpf_prog_alloc(prog->aux);
2161 if (err)
2162 goto free_prog_nouncharge;
2163
2164 err = bpf_prog_charge_memlock(prog);
2165 if (err)
2166 goto free_prog_sec;
2167
2168 prog->len = attr->insn_cnt;
2169
2170 err = -EFAULT;
2171 if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
2172 bpf_prog_insn_size(prog)) != 0)
2173 goto free_prog;
2174
2175 prog->orig_prog = NULL;
2176 prog->jited = 0;
2177
2178 atomic64_set(&prog->aux->refcnt, 1);
2179 prog->gpl_compatible = is_gpl ? 1 : 0;
2180
2181 if (bpf_prog_is_dev_bound(prog->aux)) {
2182 err = bpf_prog_offload_init(prog, attr);
2183 if (err)
2184 goto free_prog;
2185 }
2186
2187 /* find program type: socket_filter vs tracing_filter */
2188 err = find_prog_type(type, prog);
2189 if (err < 0)
2190 goto free_prog;
2191
2192 prog->aux->load_time = ktime_get_boottime_ns();
2193 err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name,
2194 sizeof(attr->prog_name));
2195 if (err < 0)
2196 goto free_prog;
2197
2198 /* run eBPF verifier */
2199 err = bpf_check(&prog, attr, uattr);
2200 if (err < 0)
2201 goto free_used_maps;
2202
2203 prog = bpf_prog_select_runtime(prog, &err);
2204 if (err < 0)
2205 goto free_used_maps;
2206
2207 err = bpf_prog_alloc_id(prog);
2208 if (err)
2209 goto free_used_maps;
2210
2211 /* Upon success of bpf_prog_alloc_id(), the BPF prog is
2212 * effectively publicly exposed. However, retrieving via
2213 * bpf_prog_get_fd_by_id() will take another reference,
2214 * therefore it cannot be gone underneath us.
2215 *
2216 * Only for the time /after/ successful bpf_prog_new_fd()
2217 * and before returning to userspace, we might just hold
2218 * one reference and any parallel close on that fd could
2219 * rip everything out. Hence, below notifications must
2220 * happen before bpf_prog_new_fd().
2221 *
2222 * Also, any failure handling from this point onwards must
2223 * be using bpf_prog_put() given the program is exposed.
2224 */
2225 bpf_prog_kallsyms_add(prog);
2226 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
2227 bpf_audit_prog(prog, BPF_AUDIT_LOAD);
2228
2229 err = bpf_prog_new_fd(prog);
2230 if (err < 0)
2231 bpf_prog_put(prog);
2232 return err;
2233
2234 free_used_maps:
2235 /* In case we have subprogs, we need to wait for a grace
2236 * period before we can tear down JIT memory since symbols
2237 * are already exposed under kallsyms.
2238 */
2239 __bpf_prog_put_noref(prog, prog->aux->func_cnt);
2240 return err;
2241 free_prog:
2242 bpf_prog_uncharge_memlock(prog);
2243 free_prog_sec:
2244 security_bpf_prog_free(prog->aux);
2245 free_prog_nouncharge:
2246 bpf_prog_free(prog);
2247 return err;
2248 }
2249
2250 #define BPF_OBJ_LAST_FIELD file_flags
2251
2252 static int bpf_obj_pin(const union bpf_attr *attr)
2253 {
2254 if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
2255 return -EINVAL;
2256
2257 return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
2258 }
2259
2260 static int bpf_obj_get(const union bpf_attr *attr)
2261 {
2262 if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
2263 attr->file_flags & ~BPF_OBJ_FLAG_MASK)
2264 return -EINVAL;
2265
2266 return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
2267 attr->file_flags);
2268 }
2269
2270 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2271 const struct bpf_link_ops *ops, struct bpf_prog *prog)
2272 {
2273 atomic64_set(&link->refcnt, 1);
2274 link->type = type;
2275 link->id = 0;
2276 link->ops = ops;
2277 link->prog = prog;
2278 }
2279
2280 static void bpf_link_free_id(int id)
2281 {
2282 if (!id)
2283 return;
2284
2285 spin_lock_bh(&link_idr_lock);
2286 idr_remove(&link_idr, id);
2287 spin_unlock_bh(&link_idr_lock);
2288 }
2289
2290 /* Clean up bpf_link and corresponding anon_inode file and FD. After
2291 * anon_inode is created, bpf_link can't be just kfree()'d due to deferred
2292 * anon_inode's release() call. This helper marksbpf_link as
2293 * defunct, releases anon_inode file and puts reserved FD. bpf_prog's refcnt
2294 * is not decremented, it's the responsibility of a calling code that failed
2295 * to complete bpf_link initialization.
2296 */
2297 void bpf_link_cleanup(struct bpf_link_primer *primer)
2298 {
2299 primer->link->prog = NULL;
2300 bpf_link_free_id(primer->id);
2301 fput(primer->file);
2302 put_unused_fd(primer->fd);
2303 }
2304
2305 void bpf_link_inc(struct bpf_link *link)
2306 {
2307 atomic64_inc(&link->refcnt);
2308 }
2309
2310 /* bpf_link_free is guaranteed to be called from process context */
2311 static void bpf_link_free(struct bpf_link *link)
2312 {
2313 bpf_link_free_id(link->id);
2314 if (link->prog) {
2315 /* detach BPF program, clean up used resources */
2316 link->ops->release(link);
2317 bpf_prog_put(link->prog);
2318 }
2319 /* free bpf_link and its containing memory */
2320 link->ops->dealloc(link);
2321 }
2322
2323 static void bpf_link_put_deferred(struct work_struct *work)
2324 {
2325 struct bpf_link *link = container_of(work, struct bpf_link, work);
2326
2327 bpf_link_free(link);
2328 }
2329
2330 /* bpf_link_put can be called from atomic context, but ensures that resources
2331 * are freed from process context
2332 */
2333 void bpf_link_put(struct bpf_link *link)
2334 {
2335 if (!atomic64_dec_and_test(&link->refcnt))
2336 return;
2337
2338 if (in_atomic()) {
2339 INIT_WORK(&link->work, bpf_link_put_deferred);
2340 schedule_work(&link->work);
2341 } else {
2342 bpf_link_free(link);
2343 }
2344 }
2345
2346 static int bpf_link_release(struct inode *inode, struct file *filp)
2347 {
2348 struct bpf_link *link = filp->private_data;
2349
2350 bpf_link_put(link);
2351 return 0;
2352 }
2353
2354 #ifdef CONFIG_PROC_FS
2355 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
2356 #define BPF_MAP_TYPE(_id, _ops)
2357 #define BPF_LINK_TYPE(_id, _name) [_id] = #_name,
2358 static const char *bpf_link_type_strs[] = {
2359 [BPF_LINK_TYPE_UNSPEC] = "<invalid>",
2360 #include <linux/bpf_types.h>
2361 };
2362 #undef BPF_PROG_TYPE
2363 #undef BPF_MAP_TYPE
2364 #undef BPF_LINK_TYPE
2365
2366 static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
2367 {
2368 const struct bpf_link *link = filp->private_data;
2369 const struct bpf_prog *prog = link->prog;
2370 char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
2371
2372 bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
2373 seq_printf(m,
2374 "link_type:\t%s\n"
2375 "link_id:\t%u\n"
2376 "prog_tag:\t%s\n"
2377 "prog_id:\t%u\n",
2378 bpf_link_type_strs[link->type],
2379 link->id,
2380 prog_tag,
2381 prog->aux->id);
2382 if (link->ops->show_fdinfo)
2383 link->ops->show_fdinfo(link, m);
2384 }
2385 #endif
2386
2387 static const struct file_operations bpf_link_fops = {
2388 #ifdef CONFIG_PROC_FS
2389 .show_fdinfo = bpf_link_show_fdinfo,
2390 #endif
2391 .release = bpf_link_release,
2392 .read = bpf_dummy_read,
2393 .write = bpf_dummy_write,
2394 };
2395
2396 static int bpf_link_alloc_id(struct bpf_link *link)
2397 {
2398 int id;
2399
2400 idr_preload(GFP_KERNEL);
2401 spin_lock_bh(&link_idr_lock);
2402 id = idr_alloc_cyclic(&link_idr, link, 1, INT_MAX, GFP_ATOMIC);
2403 spin_unlock_bh(&link_idr_lock);
2404 idr_preload_end();
2405
2406 return id;
2407 }
2408
2409 /* Prepare bpf_link to be exposed to user-space by allocating anon_inode file,
2410 * reserving unused FD and allocating ID from link_idr. This is to be paired
2411 * with bpf_link_settle() to install FD and ID and expose bpf_link to
2412 * user-space, if bpf_link is successfully attached. If not, bpf_link and
2413 * pre-allocated resources are to be freed with bpf_cleanup() call. All the
2414 * transient state is passed around in struct bpf_link_primer.
2415 * This is preferred way to create and initialize bpf_link, especially when
2416 * there are complicated and expensive operations inbetween creating bpf_link
2417 * itself and attaching it to BPF hook. By using bpf_link_prime() and
2418 * bpf_link_settle() kernel code using bpf_link doesn't have to perform
2419 * expensive (and potentially failing) roll back operations in a rare case
2420 * that file, FD, or ID can't be allocated.
2421 */
2422 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer)
2423 {
2424 struct file *file;
2425 int fd, id;
2426
2427 fd = get_unused_fd_flags(O_CLOEXEC);
2428 if (fd < 0)
2429 return fd;
2430
2431
2432 id = bpf_link_alloc_id(link);
2433 if (id < 0) {
2434 put_unused_fd(fd);
2435 return id;
2436 }
2437
2438 file = anon_inode_getfile("bpf_link", &bpf_link_fops, link, O_CLOEXEC);
2439 if (IS_ERR(file)) {
2440 bpf_link_free_id(id);
2441 put_unused_fd(fd);
2442 return PTR_ERR(file);
2443 }
2444
2445 primer->link = link;
2446 primer->file = file;
2447 primer->fd = fd;
2448 primer->id = id;
2449 return 0;
2450 }
2451
2452 int bpf_link_settle(struct bpf_link_primer *primer)
2453 {
2454 /* make bpf_link fetchable by ID */
2455 spin_lock_bh(&link_idr_lock);
2456 primer->link->id = primer->id;
2457 spin_unlock_bh(&link_idr_lock);
2458 /* make bpf_link fetchable by FD */
2459 fd_install(primer->fd, primer->file);
2460 /* pass through installed FD */
2461 return primer->fd;
2462 }
2463
2464 int bpf_link_new_fd(struct bpf_link *link)
2465 {
2466 return anon_inode_getfd("bpf-link", &bpf_link_fops, link, O_CLOEXEC);
2467 }
2468
2469 struct bpf_link *bpf_link_get_from_fd(u32 ufd)
2470 {
2471 struct fd f = fdget(ufd);
2472 struct bpf_link *link;
2473
2474 if (!f.file)
2475 return ERR_PTR(-EBADF);
2476 if (f.file->f_op != &bpf_link_fops) {
2477 fdput(f);
2478 return ERR_PTR(-EINVAL);
2479 }
2480
2481 link = f.file->private_data;
2482 bpf_link_inc(link);
2483 fdput(f);
2484
2485 return link;
2486 }
2487
2488 struct bpf_tracing_link {
2489 struct bpf_link link;
2490 enum bpf_attach_type attach_type;
2491 };
2492
2493 static void bpf_tracing_link_release(struct bpf_link *link)
2494 {
2495 WARN_ON_ONCE(bpf_trampoline_unlink_prog(link->prog));
2496 }
2497
2498 static void bpf_tracing_link_dealloc(struct bpf_link *link)
2499 {
2500 struct bpf_tracing_link *tr_link =
2501 container_of(link, struct bpf_tracing_link, link);
2502
2503 kfree(tr_link);
2504 }
2505
2506 static void bpf_tracing_link_show_fdinfo(const struct bpf_link *link,
2507 struct seq_file *seq)
2508 {
2509 struct bpf_tracing_link *tr_link =
2510 container_of(link, struct bpf_tracing_link, link);
2511
2512 seq_printf(seq,
2513 "attach_type:\t%d\n",
2514 tr_link->attach_type);
2515 }
2516
2517 static int bpf_tracing_link_fill_link_info(const struct bpf_link *link,
2518 struct bpf_link_info *info)
2519 {
2520 struct bpf_tracing_link *tr_link =
2521 container_of(link, struct bpf_tracing_link, link);
2522
2523 info->tracing.attach_type = tr_link->attach_type;
2524
2525 return 0;
2526 }
2527
2528 static const struct bpf_link_ops bpf_tracing_link_lops = {
2529 .release = bpf_tracing_link_release,
2530 .dealloc = bpf_tracing_link_dealloc,
2531 .show_fdinfo = bpf_tracing_link_show_fdinfo,
2532 .fill_link_info = bpf_tracing_link_fill_link_info,
2533 };
2534
2535 static int bpf_tracing_prog_attach(struct bpf_prog *prog)
2536 {
2537 struct bpf_link_primer link_primer;
2538 struct bpf_tracing_link *link;
2539 int err;
2540
2541 switch (prog->type) {
2542 case BPF_PROG_TYPE_TRACING:
2543 if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
2544 prog->expected_attach_type != BPF_TRACE_FEXIT &&
2545 prog->expected_attach_type != BPF_MODIFY_RETURN) {
2546 err = -EINVAL;
2547 goto out_put_prog;
2548 }
2549 break;
2550 case BPF_PROG_TYPE_EXT:
2551 if (prog->expected_attach_type != 0) {
2552 err = -EINVAL;
2553 goto out_put_prog;
2554 }
2555 break;
2556 case BPF_PROG_TYPE_LSM:
2557 if (prog->expected_attach_type != BPF_LSM_MAC) {
2558 err = -EINVAL;
2559 goto out_put_prog;
2560 }
2561 break;
2562 default:
2563 err = -EINVAL;
2564 goto out_put_prog;
2565 }
2566
2567 link = kzalloc(sizeof(*link), GFP_USER);
2568 if (!link) {
2569 err = -ENOMEM;
2570 goto out_put_prog;
2571 }
2572 bpf_link_init(&link->link, BPF_LINK_TYPE_TRACING,
2573 &bpf_tracing_link_lops, prog);
2574 link->attach_type = prog->expected_attach_type;
2575
2576 err = bpf_link_prime(&link->link, &link_primer);
2577 if (err) {
2578 kfree(link);
2579 goto out_put_prog;
2580 }
2581
2582 err = bpf_trampoline_link_prog(prog);
2583 if (err) {
2584 bpf_link_cleanup(&link_primer);
2585 goto out_put_prog;
2586 }
2587
2588 return bpf_link_settle(&link_primer);
2589 out_put_prog:
2590 bpf_prog_put(prog);
2591 return err;
2592 }
2593
2594 struct bpf_raw_tp_link {
2595 struct bpf_link link;
2596 struct bpf_raw_event_map *btp;
2597 };
2598
2599 static void bpf_raw_tp_link_release(struct bpf_link *link)
2600 {
2601 struct bpf_raw_tp_link *raw_tp =
2602 container_of(link, struct bpf_raw_tp_link, link);
2603
2604 bpf_probe_unregister(raw_tp->btp, raw_tp->link.prog);
2605 bpf_put_raw_tracepoint(raw_tp->btp);
2606 }
2607
2608 static void bpf_raw_tp_link_dealloc(struct bpf_link *link)
2609 {
2610 struct bpf_raw_tp_link *raw_tp =
2611 container_of(link, struct bpf_raw_tp_link, link);
2612
2613 kfree(raw_tp);
2614 }
2615
2616 static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
2617 struct seq_file *seq)
2618 {
2619 struct bpf_raw_tp_link *raw_tp_link =
2620 container_of(link, struct bpf_raw_tp_link, link);
2621
2622 seq_printf(seq,
2623 "tp_name:\t%s\n",
2624 raw_tp_link->btp->tp->name);
2625 }
2626
2627 static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
2628 struct bpf_link_info *info)
2629 {
2630 struct bpf_raw_tp_link *raw_tp_link =
2631 container_of(link, struct bpf_raw_tp_link, link);
2632 char __user *ubuf = u64_to_user_ptr(info->raw_tracepoint.tp_name);
2633 const char *tp_name = raw_tp_link->btp->tp->name;
2634 u32 ulen = info->raw_tracepoint.tp_name_len;
2635 size_t tp_len = strlen(tp_name);
2636
2637 if (ulen && !ubuf)
2638 return -EINVAL;
2639
2640 info->raw_tracepoint.tp_name_len = tp_len + 1;
2641
2642 if (!ubuf)
2643 return 0;
2644
2645 if (ulen >= tp_len + 1) {
2646 if (copy_to_user(ubuf, tp_name, tp_len + 1))
2647 return -EFAULT;
2648 } else {
2649 char zero = '\0';
2650
2651 if (copy_to_user(ubuf, tp_name, ulen - 1))
2652 return -EFAULT;
2653 if (put_user(zero, ubuf + ulen - 1))
2654 return -EFAULT;
2655 return -ENOSPC;
2656 }
2657
2658 return 0;
2659 }
2660
2661 static const struct bpf_link_ops bpf_raw_tp_link_lops = {
2662 .release = bpf_raw_tp_link_release,
2663 .dealloc = bpf_raw_tp_link_dealloc,
2664 .show_fdinfo = bpf_raw_tp_link_show_fdinfo,
2665 .fill_link_info = bpf_raw_tp_link_fill_link_info,
2666 };
2667
2668 #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
2669
2670 static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
2671 {
2672 struct bpf_link_primer link_primer;
2673 struct bpf_raw_tp_link *link;
2674 struct bpf_raw_event_map *btp;
2675 struct bpf_prog *prog;
2676 const char *tp_name;
2677 char buf[128];
2678 int err;
2679
2680 if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN))
2681 return -EINVAL;
2682
2683 prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
2684 if (IS_ERR(prog))
2685 return PTR_ERR(prog);
2686
2687 switch (prog->type) {
2688 case BPF_PROG_TYPE_TRACING:
2689 case BPF_PROG_TYPE_EXT:
2690 case BPF_PROG_TYPE_LSM:
2691 if (attr->raw_tracepoint.name) {
2692 /* The attach point for this category of programs
2693 * should be specified via btf_id during program load.
2694 */
2695 err = -EINVAL;
2696 goto out_put_prog;
2697 }
2698 if (prog->type == BPF_PROG_TYPE_TRACING &&
2699 prog->expected_attach_type == BPF_TRACE_RAW_TP) {
2700 tp_name = prog->aux->attach_func_name;
2701 break;
2702 }
2703 return bpf_tracing_prog_attach(prog);
2704 case BPF_PROG_TYPE_RAW_TRACEPOINT:
2705 case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
2706 if (strncpy_from_user(buf,
2707 u64_to_user_ptr(attr->raw_tracepoint.name),
2708 sizeof(buf) - 1) < 0) {
2709 err = -EFAULT;
2710 goto out_put_prog;
2711 }
2712 buf[sizeof(buf) - 1] = 0;
2713 tp_name = buf;
2714 break;
2715 default:
2716 err = -EINVAL;
2717 goto out_put_prog;
2718 }
2719
2720 btp = bpf_get_raw_tracepoint(tp_name);
2721 if (!btp) {
2722 err = -ENOENT;
2723 goto out_put_prog;
2724 }
2725
2726 link = kzalloc(sizeof(*link), GFP_USER);
2727 if (!link) {
2728 err = -ENOMEM;
2729 goto out_put_btp;
2730 }
2731 bpf_link_init(&link->link, BPF_LINK_TYPE_RAW_TRACEPOINT,
2732 &bpf_raw_tp_link_lops, prog);
2733 link->btp = btp;
2734
2735 err = bpf_link_prime(&link->link, &link_primer);
2736 if (err) {
2737 kfree(link);
2738 goto out_put_btp;
2739 }
2740
2741 err = bpf_probe_register(link->btp, prog);
2742 if (err) {
2743 bpf_link_cleanup(&link_primer);
2744 goto out_put_btp;
2745 }
2746
2747 return bpf_link_settle(&link_primer);
2748
2749 out_put_btp:
2750 bpf_put_raw_tracepoint(btp);
2751 out_put_prog:
2752 bpf_prog_put(prog);
2753 return err;
2754 }
2755
2756 static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
2757 enum bpf_attach_type attach_type)
2758 {
2759 switch (prog->type) {
2760 case BPF_PROG_TYPE_CGROUP_SOCK:
2761 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2762 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2763 case BPF_PROG_TYPE_SK_LOOKUP:
2764 return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
2765 case BPF_PROG_TYPE_CGROUP_SKB:
2766 if (!capable(CAP_NET_ADMIN))
2767 /* cg-skb progs can be loaded by unpriv user.
2768 * check permissions at attach time.
2769 */
2770 return -EPERM;
2771 return prog->enforce_expected_attach_type &&
2772 prog->expected_attach_type != attach_type ?
2773 -EINVAL : 0;
2774 default:
2775 return 0;
2776 }
2777 }
2778
2779 static enum bpf_prog_type
2780 attach_type_to_prog_type(enum bpf_attach_type attach_type)
2781 {
2782 switch (attach_type) {
2783 case BPF_CGROUP_INET_INGRESS:
2784 case BPF_CGROUP_INET_EGRESS:
2785 return BPF_PROG_TYPE_CGROUP_SKB;
2786 break;
2787 case BPF_CGROUP_INET_SOCK_CREATE:
2788 case BPF_CGROUP_INET_SOCK_RELEASE:
2789 case BPF_CGROUP_INET4_POST_BIND:
2790 case BPF_CGROUP_INET6_POST_BIND:
2791 return BPF_PROG_TYPE_CGROUP_SOCK;
2792 case BPF_CGROUP_INET4_BIND:
2793 case BPF_CGROUP_INET6_BIND:
2794 case BPF_CGROUP_INET4_CONNECT:
2795 case BPF_CGROUP_INET6_CONNECT:
2796 case BPF_CGROUP_INET4_GETPEERNAME:
2797 case BPF_CGROUP_INET6_GETPEERNAME:
2798 case BPF_CGROUP_INET4_GETSOCKNAME:
2799 case BPF_CGROUP_INET6_GETSOCKNAME:
2800 case BPF_CGROUP_UDP4_SENDMSG:
2801 case BPF_CGROUP_UDP6_SENDMSG:
2802 case BPF_CGROUP_UDP4_RECVMSG:
2803 case BPF_CGROUP_UDP6_RECVMSG:
2804 return BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
2805 case BPF_CGROUP_SOCK_OPS:
2806 return BPF_PROG_TYPE_SOCK_OPS;
2807 case BPF_CGROUP_DEVICE:
2808 return BPF_PROG_TYPE_CGROUP_DEVICE;
2809 case BPF_SK_MSG_VERDICT:
2810 return BPF_PROG_TYPE_SK_MSG;
2811 case BPF_SK_SKB_STREAM_PARSER:
2812 case BPF_SK_SKB_STREAM_VERDICT:
2813 return BPF_PROG_TYPE_SK_SKB;
2814 case BPF_LIRC_MODE2:
2815 return BPF_PROG_TYPE_LIRC_MODE2;
2816 case BPF_FLOW_DISSECTOR:
2817 return BPF_PROG_TYPE_FLOW_DISSECTOR;
2818 case BPF_CGROUP_SYSCTL:
2819 return BPF_PROG_TYPE_CGROUP_SYSCTL;
2820 case BPF_CGROUP_GETSOCKOPT:
2821 case BPF_CGROUP_SETSOCKOPT:
2822 return BPF_PROG_TYPE_CGROUP_SOCKOPT;
2823 case BPF_TRACE_ITER:
2824 return BPF_PROG_TYPE_TRACING;
2825 case BPF_SK_LOOKUP:
2826 return BPF_PROG_TYPE_SK_LOOKUP;
2827 case BPF_XDP:
2828 return BPF_PROG_TYPE_XDP;
2829 default:
2830 return BPF_PROG_TYPE_UNSPEC;
2831 }
2832 }
2833
2834 #define BPF_PROG_ATTACH_LAST_FIELD replace_bpf_fd
2835
2836 #define BPF_F_ATTACH_MASK \
2837 (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI | BPF_F_REPLACE)
2838
2839 static int bpf_prog_attach(const union bpf_attr *attr)
2840 {
2841 enum bpf_prog_type ptype;
2842 struct bpf_prog *prog;
2843 int ret;
2844
2845 if (CHECK_ATTR(BPF_PROG_ATTACH))
2846 return -EINVAL;
2847
2848 if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
2849 return -EINVAL;
2850
2851 ptype = attach_type_to_prog_type(attr->attach_type);
2852 if (ptype == BPF_PROG_TYPE_UNSPEC)
2853 return -EINVAL;
2854
2855 prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
2856 if (IS_ERR(prog))
2857 return PTR_ERR(prog);
2858
2859 if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
2860 bpf_prog_put(prog);
2861 return -EINVAL;
2862 }
2863
2864 switch (ptype) {
2865 case BPF_PROG_TYPE_SK_SKB:
2866 case BPF_PROG_TYPE_SK_MSG:
2867 ret = sock_map_get_from_fd(attr, prog);
2868 break;
2869 case BPF_PROG_TYPE_LIRC_MODE2:
2870 ret = lirc_prog_attach(attr, prog);
2871 break;
2872 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2873 ret = netns_bpf_prog_attach(attr, prog);
2874 break;
2875 case BPF_PROG_TYPE_CGROUP_DEVICE:
2876 case BPF_PROG_TYPE_CGROUP_SKB:
2877 case BPF_PROG_TYPE_CGROUP_SOCK:
2878 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2879 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2880 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2881 case BPF_PROG_TYPE_SOCK_OPS:
2882 ret = cgroup_bpf_prog_attach(attr, ptype, prog);
2883 break;
2884 default:
2885 ret = -EINVAL;
2886 }
2887
2888 if (ret)
2889 bpf_prog_put(prog);
2890 return ret;
2891 }
2892
2893 #define BPF_PROG_DETACH_LAST_FIELD attach_type
2894
2895 static int bpf_prog_detach(const union bpf_attr *attr)
2896 {
2897 enum bpf_prog_type ptype;
2898
2899 if (CHECK_ATTR(BPF_PROG_DETACH))
2900 return -EINVAL;
2901
2902 ptype = attach_type_to_prog_type(attr->attach_type);
2903
2904 switch (ptype) {
2905 case BPF_PROG_TYPE_SK_MSG:
2906 case BPF_PROG_TYPE_SK_SKB:
2907 return sock_map_prog_detach(attr, ptype);
2908 case BPF_PROG_TYPE_LIRC_MODE2:
2909 return lirc_prog_detach(attr);
2910 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2911 return netns_bpf_prog_detach(attr, ptype);
2912 case BPF_PROG_TYPE_CGROUP_DEVICE:
2913 case BPF_PROG_TYPE_CGROUP_SKB:
2914 case BPF_PROG_TYPE_CGROUP_SOCK:
2915 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2916 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2917 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2918 case BPF_PROG_TYPE_SOCK_OPS:
2919 return cgroup_bpf_prog_detach(attr, ptype);
2920 default:
2921 return -EINVAL;
2922 }
2923 }
2924
2925 #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
2926
2927 static int bpf_prog_query(const union bpf_attr *attr,
2928 union bpf_attr __user *uattr)
2929 {
2930 if (!capable(CAP_NET_ADMIN))
2931 return -EPERM;
2932 if (CHECK_ATTR(BPF_PROG_QUERY))
2933 return -EINVAL;
2934 if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
2935 return -EINVAL;
2936
2937 switch (attr->query.attach_type) {
2938 case BPF_CGROUP_INET_INGRESS:
2939 case BPF_CGROUP_INET_EGRESS:
2940 case BPF_CGROUP_INET_SOCK_CREATE:
2941 case BPF_CGROUP_INET_SOCK_RELEASE:
2942 case BPF_CGROUP_INET4_BIND:
2943 case BPF_CGROUP_INET6_BIND:
2944 case BPF_CGROUP_INET4_POST_BIND:
2945 case BPF_CGROUP_INET6_POST_BIND:
2946 case BPF_CGROUP_INET4_CONNECT:
2947 case BPF_CGROUP_INET6_CONNECT:
2948 case BPF_CGROUP_INET4_GETPEERNAME:
2949 case BPF_CGROUP_INET6_GETPEERNAME:
2950 case BPF_CGROUP_INET4_GETSOCKNAME:
2951 case BPF_CGROUP_INET6_GETSOCKNAME:
2952 case BPF_CGROUP_UDP4_SENDMSG:
2953 case BPF_CGROUP_UDP6_SENDMSG:
2954 case BPF_CGROUP_UDP4_RECVMSG:
2955 case BPF_CGROUP_UDP6_RECVMSG:
2956 case BPF_CGROUP_SOCK_OPS:
2957 case BPF_CGROUP_DEVICE:
2958 case BPF_CGROUP_SYSCTL:
2959 case BPF_CGROUP_GETSOCKOPT:
2960 case BPF_CGROUP_SETSOCKOPT:
2961 return cgroup_bpf_prog_query(attr, uattr);
2962 case BPF_LIRC_MODE2:
2963 return lirc_prog_query(attr, uattr);
2964 case BPF_FLOW_DISSECTOR:
2965 case BPF_SK_LOOKUP:
2966 return netns_bpf_prog_query(attr, uattr);
2967 default:
2968 return -EINVAL;
2969 }
2970 }
2971
2972 #define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out
2973
2974 static int bpf_prog_test_run(const union bpf_attr *attr,
2975 union bpf_attr __user *uattr)
2976 {
2977 struct bpf_prog *prog;
2978 int ret = -ENOTSUPP;
2979
2980 if (CHECK_ATTR(BPF_PROG_TEST_RUN))
2981 return -EINVAL;
2982
2983 if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
2984 (!attr->test.ctx_size_in && attr->test.ctx_in))
2985 return -EINVAL;
2986
2987 if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
2988 (!attr->test.ctx_size_out && attr->test.ctx_out))
2989 return -EINVAL;
2990
2991 prog = bpf_prog_get(attr->test.prog_fd);
2992 if (IS_ERR(prog))
2993 return PTR_ERR(prog);
2994
2995 if (prog->aux->ops->test_run)
2996 ret = prog->aux->ops->test_run(prog, attr, uattr);
2997
2998 bpf_prog_put(prog);
2999 return ret;
3000 }
3001
3002 #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
3003
3004 static int bpf_obj_get_next_id(const union bpf_attr *attr,
3005 union bpf_attr __user *uattr,
3006 struct idr *idr,
3007 spinlock_t *lock)
3008 {
3009 u32 next_id = attr->start_id;
3010 int err = 0;
3011
3012 if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
3013 return -EINVAL;
3014
3015 if (!capable(CAP_SYS_ADMIN))
3016 return -EPERM;
3017
3018 next_id++;
3019 spin_lock_bh(lock);
3020 if (!idr_get_next(idr, &next_id))
3021 err = -ENOENT;
3022 spin_unlock_bh(lock);
3023
3024 if (!err)
3025 err = put_user(next_id, &uattr->next_id);
3026
3027 return err;
3028 }
3029
3030 struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
3031 {
3032 struct bpf_map *map;
3033
3034 spin_lock_bh(&map_idr_lock);
3035 again:
3036 map = idr_get_next(&map_idr, id);
3037 if (map) {
3038 map = __bpf_map_inc_not_zero(map, false);
3039 if (IS_ERR(map)) {
3040 (*id)++;
3041 goto again;
3042 }
3043 }
3044 spin_unlock_bh(&map_idr_lock);
3045
3046 return map;
3047 }
3048
3049 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id)
3050 {
3051 struct bpf_prog *prog;
3052
3053 spin_lock_bh(&prog_idr_lock);
3054 again:
3055 prog = idr_get_next(&prog_idr, id);
3056 if (prog) {
3057 prog = bpf_prog_inc_not_zero(prog);
3058 if (IS_ERR(prog)) {
3059 (*id)++;
3060 goto again;
3061 }
3062 }
3063 spin_unlock_bh(&prog_idr_lock);
3064
3065 return prog;
3066 }
3067
3068 #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
3069
3070 struct bpf_prog *bpf_prog_by_id(u32 id)
3071 {
3072 struct bpf_prog *prog;
3073
3074 if (!id)
3075 return ERR_PTR(-ENOENT);
3076
3077 spin_lock_bh(&prog_idr_lock);
3078 prog = idr_find(&prog_idr, id);
3079 if (prog)
3080 prog = bpf_prog_inc_not_zero(prog);
3081 else
3082 prog = ERR_PTR(-ENOENT);
3083 spin_unlock_bh(&prog_idr_lock);
3084 return prog;
3085 }
3086
3087 static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
3088 {
3089 struct bpf_prog *prog;
3090 u32 id = attr->prog_id;
3091 int fd;
3092
3093 if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
3094 return -EINVAL;
3095
3096 if (!capable(CAP_SYS_ADMIN))
3097 return -EPERM;
3098
3099 prog = bpf_prog_by_id(id);
3100 if (IS_ERR(prog))
3101 return PTR_ERR(prog);
3102
3103 fd = bpf_prog_new_fd(prog);
3104 if (fd < 0)
3105 bpf_prog_put(prog);
3106
3107 return fd;
3108 }
3109
3110 #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
3111
3112 static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
3113 {
3114 struct bpf_map *map;
3115 u32 id = attr->map_id;
3116 int f_flags;
3117 int fd;
3118
3119 if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
3120 attr->open_flags & ~BPF_OBJ_FLAG_MASK)
3121 return -EINVAL;
3122
3123 if (!capable(CAP_SYS_ADMIN))
3124 return -EPERM;
3125
3126 f_flags = bpf_get_file_flag(attr->open_flags);
3127 if (f_flags < 0)
3128 return f_flags;
3129
3130 spin_lock_bh(&map_idr_lock);
3131 map = idr_find(&map_idr, id);
3132 if (map)
3133 map = __bpf_map_inc_not_zero(map, true);
3134 else
3135 map = ERR_PTR(-ENOENT);
3136 spin_unlock_bh(&map_idr_lock);
3137
3138 if (IS_ERR(map))
3139 return PTR_ERR(map);
3140
3141 fd = bpf_map_new_fd(map, f_flags);
3142 if (fd < 0)
3143 bpf_map_put_with_uref(map);
3144
3145 return fd;
3146 }
3147
3148 static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
3149 unsigned long addr, u32 *off,
3150 u32 *type)
3151 {
3152 const struct bpf_map *map;
3153 int i;
3154
3155 for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
3156 map = prog->aux->used_maps[i];
3157 if (map == (void *)addr) {
3158 *type = BPF_PSEUDO_MAP_FD;
3159 return map;
3160 }
3161 if (!map->ops->map_direct_value_meta)
3162 continue;
3163 if (!map->ops->map_direct_value_meta(map, addr, off)) {
3164 *type = BPF_PSEUDO_MAP_VALUE;
3165 return map;
3166 }
3167 }
3168
3169 return NULL;
3170 }
3171
3172 static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
3173 const struct cred *f_cred)
3174 {
3175 const struct bpf_map *map;
3176 struct bpf_insn *insns;
3177 u32 off, type;
3178 u64 imm;
3179 u8 code;
3180 int i;
3181
3182 insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
3183 GFP_USER);
3184 if (!insns)
3185 return insns;
3186
3187 for (i = 0; i < prog->len; i++) {
3188 code = insns[i].code;
3189
3190 if (code == (BPF_JMP | BPF_TAIL_CALL)) {
3191 insns[i].code = BPF_JMP | BPF_CALL;
3192 insns[i].imm = BPF_FUNC_tail_call;
3193 /* fall-through */
3194 }
3195 if (code == (BPF_JMP | BPF_CALL) ||
3196 code == (BPF_JMP | BPF_CALL_ARGS)) {
3197 if (code == (BPF_JMP | BPF_CALL_ARGS))
3198 insns[i].code = BPF_JMP | BPF_CALL;
3199 if (!bpf_dump_raw_ok(f_cred))
3200 insns[i].imm = 0;
3201 continue;
3202 }
3203 if (BPF_CLASS(code) == BPF_LDX && BPF_MODE(code) == BPF_PROBE_MEM) {
3204 insns[i].code = BPF_LDX | BPF_SIZE(code) | BPF_MEM;
3205 continue;
3206 }
3207
3208 if (code != (BPF_LD | BPF_IMM | BPF_DW))
3209 continue;
3210
3211 imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
3212 map = bpf_map_from_imm(prog, imm, &off, &type);
3213 if (map) {
3214 insns[i].src_reg = type;
3215 insns[i].imm = map->id;
3216 insns[i + 1].imm = off;
3217 continue;
3218 }
3219 }
3220
3221 return insns;
3222 }
3223
3224 static int set_info_rec_size(struct bpf_prog_info *info)
3225 {
3226 /*
3227 * Ensure info.*_rec_size is the same as kernel expected size
3228 *
3229 * or
3230 *
3231 * Only allow zero *_rec_size if both _rec_size and _cnt are
3232 * zero. In this case, the kernel will set the expected
3233 * _rec_size back to the info.
3234 */
3235
3236 if ((info->nr_func_info || info->func_info_rec_size) &&
3237 info->func_info_rec_size != sizeof(struct bpf_func_info))
3238 return -EINVAL;
3239
3240 if ((info->nr_line_info || info->line_info_rec_size) &&
3241 info->line_info_rec_size != sizeof(struct bpf_line_info))
3242 return -EINVAL;
3243
3244 if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
3245 info->jited_line_info_rec_size != sizeof(__u64))
3246 return -EINVAL;
3247
3248 info->func_info_rec_size = sizeof(struct bpf_func_info);
3249 info->line_info_rec_size = sizeof(struct bpf_line_info);
3250 info->jited_line_info_rec_size = sizeof(__u64);
3251
3252 return 0;
3253 }
3254
3255 static int bpf_prog_get_info_by_fd(struct file *file,
3256 struct bpf_prog *prog,
3257 const union bpf_attr *attr,
3258 union bpf_attr __user *uattr)
3259 {
3260 struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3261 struct bpf_prog_info info;
3262 u32 info_len = attr->info.info_len;
3263 struct bpf_prog_stats stats;
3264 char __user *uinsns;
3265 u32 ulen;
3266 int err;
3267
3268 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
3269 if (err)
3270 return err;
3271 info_len = min_t(u32, sizeof(info), info_len);
3272
3273 memset(&info, 0, sizeof(info));
3274 if (copy_from_user(&info, uinfo, info_len))
3275 return -EFAULT;
3276
3277 info.type = prog->type;
3278 info.id = prog->aux->id;
3279 info.load_time = prog->aux->load_time;
3280 info.created_by_uid = from_kuid_munged(current_user_ns(),
3281 prog->aux->user->uid);
3282 info.gpl_compatible = prog->gpl_compatible;
3283
3284 memcpy(info.tag, prog->tag, sizeof(prog->tag));
3285 memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
3286
3287 ulen = info.nr_map_ids;
3288 info.nr_map_ids = prog->aux->used_map_cnt;
3289 ulen = min_t(u32, info.nr_map_ids, ulen);
3290 if (ulen) {
3291 u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
3292 u32 i;
3293
3294 for (i = 0; i < ulen; i++)
3295 if (put_user(prog->aux->used_maps[i]->id,
3296 &user_map_ids[i]))
3297 return -EFAULT;
3298 }
3299
3300 err = set_info_rec_size(&info);
3301 if (err)
3302 return err;
3303
3304 bpf_prog_get_stats(prog, &stats);
3305 info.run_time_ns = stats.nsecs;
3306 info.run_cnt = stats.cnt;
3307
3308 if (!bpf_capable()) {
3309 info.jited_prog_len = 0;
3310 info.xlated_prog_len = 0;
3311 info.nr_jited_ksyms = 0;
3312 info.nr_jited_func_lens = 0;
3313 info.nr_func_info = 0;
3314 info.nr_line_info = 0;
3315 info.nr_jited_line_info = 0;
3316 goto done;
3317 }
3318
3319 ulen = info.xlated_prog_len;
3320 info.xlated_prog_len = bpf_prog_insn_size(prog);
3321 if (info.xlated_prog_len && ulen) {
3322 struct bpf_insn *insns_sanitized;
3323 bool fault;
3324
3325 if (prog->blinded && !bpf_dump_raw_ok(file->f_cred)) {
3326 info.xlated_prog_insns = 0;
3327 goto done;
3328 }
3329 insns_sanitized = bpf_insn_prepare_dump(prog, file->f_cred);
3330 if (!insns_sanitized)
3331 return -ENOMEM;
3332 uinsns = u64_to_user_ptr(info.xlated_prog_insns);
3333 ulen = min_t(u32, info.xlated_prog_len, ulen);
3334 fault = copy_to_user(uinsns, insns_sanitized, ulen);
3335 kfree(insns_sanitized);
3336 if (fault)
3337 return -EFAULT;
3338 }
3339
3340 if (bpf_prog_is_dev_bound(prog->aux)) {
3341 err = bpf_prog_offload_info_fill(&info, prog);
3342 if (err)
3343 return err;
3344 goto done;
3345 }
3346
3347 /* NOTE: the following code is supposed to be skipped for offload.
3348 * bpf_prog_offload_info_fill() is the place to fill similar fields
3349 * for offload.
3350 */
3351 ulen = info.jited_prog_len;
3352 if (prog->aux->func_cnt) {
3353 u32 i;
3354
3355 info.jited_prog_len = 0;
3356 for (i = 0; i < prog->aux->func_cnt; i++)
3357 info.jited_prog_len += prog->aux->func[i]->jited_len;
3358 } else {
3359 info.jited_prog_len = prog->jited_len;
3360 }
3361
3362 if (info.jited_prog_len && ulen) {
3363 if (bpf_dump_raw_ok(file->f_cred)) {
3364 uinsns = u64_to_user_ptr(info.jited_prog_insns);
3365 ulen = min_t(u32, info.jited_prog_len, ulen);
3366
3367 /* for multi-function programs, copy the JITed
3368 * instructions for all the functions
3369 */
3370 if (prog->aux->func_cnt) {
3371 u32 len, free, i;
3372 u8 *img;
3373
3374 free = ulen;
3375 for (i = 0; i < prog->aux->func_cnt; i++) {
3376 len = prog->aux->func[i]->jited_len;
3377 len = min_t(u32, len, free);
3378 img = (u8 *) prog->aux->func[i]->bpf_func;
3379 if (copy_to_user(uinsns, img, len))
3380 return -EFAULT;
3381 uinsns += len;
3382 free -= len;
3383 if (!free)
3384 break;
3385 }
3386 } else {
3387 if (copy_to_user(uinsns, prog->bpf_func, ulen))
3388 return -EFAULT;
3389 }
3390 } else {
3391 info.jited_prog_insns = 0;
3392 }
3393 }
3394
3395 ulen = info.nr_jited_ksyms;
3396 info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
3397 if (ulen) {
3398 if (bpf_dump_raw_ok(file->f_cred)) {
3399 unsigned long ksym_addr;
3400 u64 __user *user_ksyms;
3401 u32 i;
3402
3403 /* copy the address of the kernel symbol
3404 * corresponding to each function
3405 */
3406 ulen = min_t(u32, info.nr_jited_ksyms, ulen);
3407 user_ksyms = u64_to_user_ptr(info.jited_ksyms);
3408 if (prog->aux->func_cnt) {
3409 for (i = 0; i < ulen; i++) {
3410 ksym_addr = (unsigned long)
3411 prog->aux->func[i]->bpf_func;
3412 if (put_user((u64) ksym_addr,
3413 &user_ksyms[i]))
3414 return -EFAULT;
3415 }
3416 } else {
3417 ksym_addr = (unsigned long) prog->bpf_func;
3418 if (put_user((u64) ksym_addr, &user_ksyms[0]))
3419 return -EFAULT;
3420 }
3421 } else {
3422 info.jited_ksyms = 0;
3423 }
3424 }
3425
3426 ulen = info.nr_jited_func_lens;
3427 info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
3428 if (ulen) {
3429 if (bpf_dump_raw_ok(file->f_cred)) {
3430 u32 __user *user_lens;
3431 u32 func_len, i;
3432
3433 /* copy the JITed image lengths for each function */
3434 ulen = min_t(u32, info.nr_jited_func_lens, ulen);
3435 user_lens = u64_to_user_ptr(info.jited_func_lens);
3436 if (prog->aux->func_cnt) {
3437 for (i = 0; i < ulen; i++) {
3438 func_len =
3439 prog->aux->func[i]->jited_len;
3440 if (put_user(func_len, &user_lens[i]))
3441 return -EFAULT;
3442 }
3443 } else {
3444 func_len = prog->jited_len;
3445 if (put_user(func_len, &user_lens[0]))
3446 return -EFAULT;
3447 }
3448 } else {
3449 info.jited_func_lens = 0;
3450 }
3451 }
3452
3453 if (prog->aux->btf)
3454 info.btf_id = btf_id(prog->aux->btf);
3455
3456 ulen = info.nr_func_info;
3457 info.nr_func_info = prog->aux->func_info_cnt;
3458 if (info.nr_func_info && ulen) {
3459 char __user *user_finfo;
3460
3461 user_finfo = u64_to_user_ptr(info.func_info);
3462 ulen = min_t(u32, info.nr_func_info, ulen);
3463 if (copy_to_user(user_finfo, prog->aux->func_info,
3464 info.func_info_rec_size * ulen))
3465 return -EFAULT;
3466 }
3467
3468 ulen = info.nr_line_info;
3469 info.nr_line_info = prog->aux->nr_linfo;
3470 if (info.nr_line_info && ulen) {
3471 __u8 __user *user_linfo;
3472
3473 user_linfo = u64_to_user_ptr(info.line_info);
3474 ulen = min_t(u32, info.nr_line_info, ulen);
3475 if (copy_to_user(user_linfo, prog->aux->linfo,
3476 info.line_info_rec_size * ulen))
3477 return -EFAULT;
3478 }
3479
3480 ulen = info.nr_jited_line_info;
3481 if (prog->aux->jited_linfo)
3482 info.nr_jited_line_info = prog->aux->nr_linfo;
3483 else
3484 info.nr_jited_line_info = 0;
3485 if (info.nr_jited_line_info && ulen) {
3486 if (bpf_dump_raw_ok(file->f_cred)) {
3487 __u64 __user *user_linfo;
3488 u32 i;
3489
3490 user_linfo = u64_to_user_ptr(info.jited_line_info);
3491 ulen = min_t(u32, info.nr_jited_line_info, ulen);
3492 for (i = 0; i < ulen; i++) {
3493 if (put_user((__u64)(long)prog->aux->jited_linfo[i],
3494 &user_linfo[i]))
3495 return -EFAULT;
3496 }
3497 } else {
3498 info.jited_line_info = 0;
3499 }
3500 }
3501
3502 ulen = info.nr_prog_tags;
3503 info.nr_prog_tags = prog->aux->func_cnt ? : 1;
3504 if (ulen) {
3505 __u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
3506 u32 i;
3507
3508 user_prog_tags = u64_to_user_ptr(info.prog_tags);
3509 ulen = min_t(u32, info.nr_prog_tags, ulen);
3510 if (prog->aux->func_cnt) {
3511 for (i = 0; i < ulen; i++) {
3512 if (copy_to_user(user_prog_tags[i],
3513 prog->aux->func[i]->tag,
3514 BPF_TAG_SIZE))
3515 return -EFAULT;
3516 }
3517 } else {
3518 if (copy_to_user(user_prog_tags[0],
3519 prog->tag, BPF_TAG_SIZE))
3520 return -EFAULT;
3521 }
3522 }
3523
3524 done:
3525 if (copy_to_user(uinfo, &info, info_len) ||
3526 put_user(info_len, &uattr->info.info_len))
3527 return -EFAULT;
3528
3529 return 0;
3530 }
3531
3532 static int bpf_map_get_info_by_fd(struct file *file,
3533 struct bpf_map *map,
3534 const union bpf_attr *attr,
3535 union bpf_attr __user *uattr)
3536 {
3537 struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3538 struct bpf_map_info info;
3539 u32 info_len = attr->info.info_len;
3540 int err;
3541
3542 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
3543 if (err)
3544 return err;
3545 info_len = min_t(u32, sizeof(info), info_len);
3546
3547 memset(&info, 0, sizeof(info));
3548 info.type = map->map_type;
3549 info.id = map->id;
3550 info.key_size = map->key_size;
3551 info.value_size = map->value_size;
3552 info.max_entries = map->max_entries;
3553 info.map_flags = map->map_flags;
3554 memcpy(info.name, map->name, sizeof(map->name));
3555
3556 if (map->btf) {
3557 info.btf_id = btf_id(map->btf);
3558 info.btf_key_type_id = map->btf_key_type_id;
3559 info.btf_value_type_id = map->btf_value_type_id;
3560 }
3561 info.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id;
3562
3563 if (bpf_map_is_dev_bound(map)) {
3564 err = bpf_map_offload_info_fill(&info, map);
3565 if (err)
3566 return err;
3567 }
3568
3569 if (copy_to_user(uinfo, &info, info_len) ||
3570 put_user(info_len, &uattr->info.info_len))
3571 return -EFAULT;
3572
3573 return 0;
3574 }
3575
3576 static int bpf_btf_get_info_by_fd(struct file *file,
3577 struct btf *btf,
3578 const union bpf_attr *attr,
3579 union bpf_attr __user *uattr)
3580 {
3581 struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3582 u32 info_len = attr->info.info_len;
3583 int err;
3584
3585 err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len);
3586 if (err)
3587 return err;
3588
3589 return btf_get_info_by_fd(btf, attr, uattr);
3590 }
3591
3592 static int bpf_link_get_info_by_fd(struct file *file,
3593 struct bpf_link *link,
3594 const union bpf_attr *attr,
3595 union bpf_attr __user *uattr)
3596 {
3597 struct bpf_link_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3598 struct bpf_link_info info;
3599 u32 info_len = attr->info.info_len;
3600 int err;
3601
3602 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
3603 if (err)
3604 return err;
3605 info_len = min_t(u32, sizeof(info), info_len);
3606
3607 memset(&info, 0, sizeof(info));
3608 if (copy_from_user(&info, uinfo, info_len))
3609 return -EFAULT;
3610
3611 info.type = link->type;
3612 info.id = link->id;
3613 info.prog_id = link->prog->aux->id;
3614
3615 if (link->ops->fill_link_info) {
3616 err = link->ops->fill_link_info(link, &info);
3617 if (err)
3618 return err;
3619 }
3620
3621 if (copy_to_user(uinfo, &info, info_len) ||
3622 put_user(info_len, &uattr->info.info_len))
3623 return -EFAULT;
3624
3625 return 0;
3626 }
3627
3628
3629 #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
3630
3631 static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
3632 union bpf_attr __user *uattr)
3633 {
3634 int ufd = attr->info.bpf_fd;
3635 struct fd f;
3636 int err;
3637
3638 if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
3639 return -EINVAL;
3640
3641 f = fdget(ufd);
3642 if (!f.file)
3643 return -EBADFD;
3644
3645 if (f.file->f_op == &bpf_prog_fops)
3646 err = bpf_prog_get_info_by_fd(f.file, f.file->private_data, attr,
3647 uattr);
3648 else if (f.file->f_op == &bpf_map_fops)
3649 err = bpf_map_get_info_by_fd(f.file, f.file->private_data, attr,
3650 uattr);
3651 else if (f.file->f_op == &btf_fops)
3652 err = bpf_btf_get_info_by_fd(f.file, f.file->private_data, attr, uattr);
3653 else if (f.file->f_op == &bpf_link_fops)
3654 err = bpf_link_get_info_by_fd(f.file, f.file->private_data,
3655 attr, uattr);
3656 else
3657 err = -EINVAL;
3658
3659 fdput(f);
3660 return err;
3661 }
3662
3663 #define BPF_BTF_LOAD_LAST_FIELD btf_log_level
3664
3665 static int bpf_btf_load(const union bpf_attr *attr)
3666 {
3667 if (CHECK_ATTR(BPF_BTF_LOAD))
3668 return -EINVAL;
3669
3670 if (!bpf_capable())
3671 return -EPERM;
3672
3673 return btf_new_fd(attr);
3674 }
3675
3676 #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
3677
3678 static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
3679 {
3680 if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
3681 return -EINVAL;
3682
3683 if (!capable(CAP_SYS_ADMIN))
3684 return -EPERM;
3685
3686 return btf_get_fd_by_id(attr->btf_id);
3687 }
3688
3689 static int bpf_task_fd_query_copy(const union bpf_attr *attr,
3690 union bpf_attr __user *uattr,
3691 u32 prog_id, u32 fd_type,
3692 const char *buf, u64 probe_offset,
3693 u64 probe_addr)
3694 {
3695 char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
3696 u32 len = buf ? strlen(buf) : 0, input_len;
3697 int err = 0;
3698
3699 if (put_user(len, &uattr->task_fd_query.buf_len))
3700 return -EFAULT;
3701 input_len = attr->task_fd_query.buf_len;
3702 if (input_len && ubuf) {
3703 if (!len) {
3704 /* nothing to copy, just make ubuf NULL terminated */
3705 char zero = '\0';
3706
3707 if (put_user(zero, ubuf))
3708 return -EFAULT;
3709 } else if (input_len >= len + 1) {
3710 /* ubuf can hold the string with NULL terminator */
3711 if (copy_to_user(ubuf, buf, len + 1))
3712 return -EFAULT;
3713 } else {
3714 /* ubuf cannot hold the string with NULL terminator,
3715 * do a partial copy with NULL terminator.
3716 */
3717 char zero = '\0';
3718
3719 err = -ENOSPC;
3720 if (copy_to_user(ubuf, buf, input_len - 1))
3721 return -EFAULT;
3722 if (put_user(zero, ubuf + input_len - 1))
3723 return -EFAULT;
3724 }
3725 }
3726
3727 if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
3728 put_user(fd_type, &uattr->task_fd_query.fd_type) ||
3729 put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
3730 put_user(probe_addr, &uattr->task_fd_query.probe_addr))
3731 return -EFAULT;
3732
3733 return err;
3734 }
3735
3736 #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
3737
3738 static int bpf_task_fd_query(const union bpf_attr *attr,
3739 union bpf_attr __user *uattr)
3740 {
3741 pid_t pid = attr->task_fd_query.pid;
3742 u32 fd = attr->task_fd_query.fd;
3743 const struct perf_event *event;
3744 struct files_struct *files;
3745 struct task_struct *task;
3746 struct file *file;
3747 int err;
3748
3749 if (CHECK_ATTR(BPF_TASK_FD_QUERY))
3750 return -EINVAL;
3751
3752 if (!capable(CAP_SYS_ADMIN))
3753 return -EPERM;
3754
3755 if (attr->task_fd_query.flags != 0)
3756 return -EINVAL;
3757
3758 task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
3759 if (!task)
3760 return -ENOENT;
3761
3762 files = get_files_struct(task);
3763 put_task_struct(task);
3764 if (!files)
3765 return -ENOENT;
3766
3767 err = 0;
3768 spin_lock(&files->file_lock);
3769 file = fcheck_files(files, fd);
3770 if (!file)
3771 err = -EBADF;
3772 else
3773 get_file(file);
3774 spin_unlock(&files->file_lock);
3775 put_files_struct(files);
3776
3777 if (err)
3778 goto out;
3779
3780 if (file->f_op == &bpf_link_fops) {
3781 struct bpf_link *link = file->private_data;
3782
3783 if (link->ops == &bpf_raw_tp_link_lops) {
3784 struct bpf_raw_tp_link *raw_tp =
3785 container_of(link, struct bpf_raw_tp_link, link);
3786 struct bpf_raw_event_map *btp = raw_tp->btp;
3787
3788 err = bpf_task_fd_query_copy(attr, uattr,
3789 raw_tp->link.prog->aux->id,
3790 BPF_FD_TYPE_RAW_TRACEPOINT,
3791 btp->tp->name, 0, 0);
3792 goto put_file;
3793 }
3794 goto out_not_supp;
3795 }
3796
3797 event = perf_get_event(file);
3798 if (!IS_ERR(event)) {
3799 u64 probe_offset, probe_addr;
3800 u32 prog_id, fd_type;
3801 const char *buf;
3802
3803 err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
3804 &buf, &probe_offset,
3805 &probe_addr);
3806 if (!err)
3807 err = bpf_task_fd_query_copy(attr, uattr, prog_id,
3808 fd_type, buf,
3809 probe_offset,
3810 probe_addr);
3811 goto put_file;
3812 }
3813
3814 out_not_supp:
3815 err = -ENOTSUPP;
3816 put_file:
3817 fput(file);
3818 out:
3819 return err;
3820 }
3821
3822 #define BPF_MAP_BATCH_LAST_FIELD batch.flags
3823
3824 #define BPF_DO_BATCH(fn) \
3825 do { \
3826 if (!fn) { \
3827 err = -ENOTSUPP; \
3828 goto err_put; \
3829 } \
3830 err = fn(map, attr, uattr); \
3831 } while (0)
3832
3833 static int bpf_map_do_batch(const union bpf_attr *attr,
3834 union bpf_attr __user *uattr,
3835 int cmd)
3836 {
3837 struct bpf_map *map;
3838 int err, ufd;
3839 struct fd f;
3840
3841 if (CHECK_ATTR(BPF_MAP_BATCH))
3842 return -EINVAL;
3843
3844 ufd = attr->batch.map_fd;
3845 f = fdget(ufd);
3846 map = __bpf_map_get(f);
3847 if (IS_ERR(map))
3848 return PTR_ERR(map);
3849
3850 if ((cmd == BPF_MAP_LOOKUP_BATCH ||
3851 cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH) &&
3852 !(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
3853 err = -EPERM;
3854 goto err_put;
3855 }
3856
3857 if (cmd != BPF_MAP_LOOKUP_BATCH &&
3858 !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
3859 err = -EPERM;
3860 goto err_put;
3861 }
3862
3863 if (cmd == BPF_MAP_LOOKUP_BATCH)
3864 BPF_DO_BATCH(map->ops->map_lookup_batch);
3865 else if (cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH)
3866 BPF_DO_BATCH(map->ops->map_lookup_and_delete_batch);
3867 else if (cmd == BPF_MAP_UPDATE_BATCH)
3868 BPF_DO_BATCH(map->ops->map_update_batch);
3869 else
3870 BPF_DO_BATCH(map->ops->map_delete_batch);
3871
3872 err_put:
3873 fdput(f);
3874 return err;
3875 }
3876
3877 static int tracing_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
3878 {
3879 if (attr->link_create.attach_type == BPF_TRACE_ITER &&
3880 prog->expected_attach_type == BPF_TRACE_ITER)
3881 return bpf_iter_link_attach(attr, prog);
3882
3883 return -EINVAL;
3884 }
3885
3886 #define BPF_LINK_CREATE_LAST_FIELD link_create.iter_info_len
3887 static int link_create(union bpf_attr *attr)
3888 {
3889 enum bpf_prog_type ptype;
3890 struct bpf_prog *prog;
3891 int ret;
3892
3893 if (CHECK_ATTR(BPF_LINK_CREATE))
3894 return -EINVAL;
3895
3896 ptype = attach_type_to_prog_type(attr->link_create.attach_type);
3897 if (ptype == BPF_PROG_TYPE_UNSPEC)
3898 return -EINVAL;
3899
3900 prog = bpf_prog_get_type(attr->link_create.prog_fd, ptype);
3901 if (IS_ERR(prog))
3902 return PTR_ERR(prog);
3903
3904 ret = bpf_prog_attach_check_attach_type(prog,
3905 attr->link_create.attach_type);
3906 if (ret)
3907 goto err_out;
3908
3909 switch (ptype) {
3910 case BPF_PROG_TYPE_CGROUP_SKB:
3911 case BPF_PROG_TYPE_CGROUP_SOCK:
3912 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
3913 case BPF_PROG_TYPE_SOCK_OPS:
3914 case BPF_PROG_TYPE_CGROUP_DEVICE:
3915 case BPF_PROG_TYPE_CGROUP_SYSCTL:
3916 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
3917 ret = cgroup_bpf_link_attach(attr, prog);
3918 break;
3919 case BPF_PROG_TYPE_TRACING:
3920 ret = tracing_bpf_link_attach(attr, prog);
3921 break;
3922 case BPF_PROG_TYPE_FLOW_DISSECTOR:
3923 case BPF_PROG_TYPE_SK_LOOKUP:
3924 ret = netns_bpf_link_create(attr, prog);
3925 break;
3926 #ifdef CONFIG_NET
3927 case BPF_PROG_TYPE_XDP:
3928 ret = bpf_xdp_link_attach(attr, prog);
3929 break;
3930 #endif
3931 default:
3932 ret = -EINVAL;
3933 }
3934
3935 err_out:
3936 if (ret < 0)
3937 bpf_prog_put(prog);
3938 return ret;
3939 }
3940
3941 #define BPF_LINK_UPDATE_LAST_FIELD link_update.old_prog_fd
3942
3943 static int link_update(union bpf_attr *attr)
3944 {
3945 struct bpf_prog *old_prog = NULL, *new_prog;
3946 struct bpf_link *link;
3947 u32 flags;
3948 int ret;
3949
3950 if (CHECK_ATTR(BPF_LINK_UPDATE))
3951 return -EINVAL;
3952
3953 flags = attr->link_update.flags;
3954 if (flags & ~BPF_F_REPLACE)
3955 return -EINVAL;
3956
3957 link = bpf_link_get_from_fd(attr->link_update.link_fd);
3958 if (IS_ERR(link))
3959 return PTR_ERR(link);
3960
3961 new_prog = bpf_prog_get(attr->link_update.new_prog_fd);
3962 if (IS_ERR(new_prog)) {
3963 ret = PTR_ERR(new_prog);
3964 goto out_put_link;
3965 }
3966
3967 if (flags & BPF_F_REPLACE) {
3968 old_prog = bpf_prog_get(attr->link_update.old_prog_fd);
3969 if (IS_ERR(old_prog)) {
3970 ret = PTR_ERR(old_prog);
3971 old_prog = NULL;
3972 goto out_put_progs;
3973 }
3974 } else if (attr->link_update.old_prog_fd) {
3975 ret = -EINVAL;
3976 goto out_put_progs;
3977 }
3978
3979 if (link->ops->update_prog)
3980 ret = link->ops->update_prog(link, new_prog, old_prog);
3981 else
3982 ret = -EINVAL;
3983
3984 out_put_progs:
3985 if (old_prog)
3986 bpf_prog_put(old_prog);
3987 if (ret)
3988 bpf_prog_put(new_prog);
3989 out_put_link:
3990 bpf_link_put(link);
3991 return ret;
3992 }
3993
3994 #define BPF_LINK_DETACH_LAST_FIELD link_detach.link_fd
3995
3996 static int link_detach(union bpf_attr *attr)
3997 {
3998 struct bpf_link *link;
3999 int ret;
4000
4001 if (CHECK_ATTR(BPF_LINK_DETACH))
4002 return -EINVAL;
4003
4004 link = bpf_link_get_from_fd(attr->link_detach.link_fd);
4005 if (IS_ERR(link))
4006 return PTR_ERR(link);
4007
4008 if (link->ops->detach)
4009 ret = link->ops->detach(link);
4010 else
4011 ret = -EOPNOTSUPP;
4012
4013 bpf_link_put(link);
4014 return ret;
4015 }
4016
4017 static int bpf_link_inc_not_zero(struct bpf_link *link)
4018 {
4019 return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? 0 : -ENOENT;
4020 }
4021
4022 #define BPF_LINK_GET_FD_BY_ID_LAST_FIELD link_id
4023
4024 static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
4025 {
4026 struct bpf_link *link;
4027 u32 id = attr->link_id;
4028 int fd, err;
4029
4030 if (CHECK_ATTR(BPF_LINK_GET_FD_BY_ID))
4031 return -EINVAL;
4032
4033 if (!capable(CAP_SYS_ADMIN))
4034 return -EPERM;
4035
4036 spin_lock_bh(&link_idr_lock);
4037 link = idr_find(&link_idr, id);
4038 /* before link is "settled", ID is 0, pretend it doesn't exist yet */
4039 if (link) {
4040 if (link->id)
4041 err = bpf_link_inc_not_zero(link);
4042 else
4043 err = -EAGAIN;
4044 } else {
4045 err = -ENOENT;
4046 }
4047 spin_unlock_bh(&link_idr_lock);
4048
4049 if (err)
4050 return err;
4051
4052 fd = bpf_link_new_fd(link);
4053 if (fd < 0)
4054 bpf_link_put(link);
4055
4056 return fd;
4057 }
4058
4059 DEFINE_MUTEX(bpf_stats_enabled_mutex);
4060
4061 static int bpf_stats_release(struct inode *inode, struct file *file)
4062 {
4063 mutex_lock(&bpf_stats_enabled_mutex);
4064 static_key_slow_dec(&bpf_stats_enabled_key.key);
4065 mutex_unlock(&bpf_stats_enabled_mutex);
4066 return 0;
4067 }
4068
4069 static const struct file_operations bpf_stats_fops = {
4070 .release = bpf_stats_release,
4071 };
4072
4073 static int bpf_enable_runtime_stats(void)
4074 {
4075 int fd;
4076
4077 mutex_lock(&bpf_stats_enabled_mutex);
4078
4079 /* Set a very high limit to avoid overflow */
4080 if (static_key_count(&bpf_stats_enabled_key.key) > INT_MAX / 2) {
4081 mutex_unlock(&bpf_stats_enabled_mutex);
4082 return -EBUSY;
4083 }
4084
4085 fd = anon_inode_getfd("bpf-stats", &bpf_stats_fops, NULL, O_CLOEXEC);
4086 if (fd >= 0)
4087 static_key_slow_inc(&bpf_stats_enabled_key.key);
4088
4089 mutex_unlock(&bpf_stats_enabled_mutex);
4090 return fd;
4091 }
4092
4093 #define BPF_ENABLE_STATS_LAST_FIELD enable_stats.type
4094
4095 static int bpf_enable_stats(union bpf_attr *attr)
4096 {
4097
4098 if (CHECK_ATTR(BPF_ENABLE_STATS))
4099 return -EINVAL;
4100
4101 if (!capable(CAP_SYS_ADMIN))
4102 return -EPERM;
4103
4104 switch (attr->enable_stats.type) {
4105 case BPF_STATS_RUN_TIME:
4106 return bpf_enable_runtime_stats();
4107 default:
4108 break;
4109 }
4110 return -EINVAL;
4111 }
4112
4113 #define BPF_ITER_CREATE_LAST_FIELD iter_create.flags
4114
4115 static int bpf_iter_create(union bpf_attr *attr)
4116 {
4117 struct bpf_link *link;
4118 int err;
4119
4120 if (CHECK_ATTR(BPF_ITER_CREATE))
4121 return -EINVAL;
4122
4123 if (attr->iter_create.flags)
4124 return -EINVAL;
4125
4126 link = bpf_link_get_from_fd(attr->iter_create.link_fd);
4127 if (IS_ERR(link))
4128 return PTR_ERR(link);
4129
4130 err = bpf_iter_new_fd(link);
4131 bpf_link_put(link);
4132
4133 return err;
4134 }
4135
4136 SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
4137 {
4138 union bpf_attr attr;
4139 int err;
4140
4141 if (sysctl_unprivileged_bpf_disabled && !bpf_capable())
4142 return -EPERM;
4143
4144 err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
4145 if (err)
4146 return err;
4147 size = min_t(u32, size, sizeof(attr));
4148
4149 /* copy attributes from user space, may be less than sizeof(bpf_attr) */
4150 memset(&attr, 0, sizeof(attr));
4151 if (copy_from_user(&attr, uattr, size) != 0)
4152 return -EFAULT;
4153
4154 err = security_bpf(cmd, &attr, size);
4155 if (err < 0)
4156 return err;
4157
4158 switch (cmd) {
4159 case BPF_MAP_CREATE:
4160 err = map_create(&attr);
4161 break;
4162 case BPF_MAP_LOOKUP_ELEM:
4163 err = map_lookup_elem(&attr);
4164 break;
4165 case BPF_MAP_UPDATE_ELEM:
4166 err = map_update_elem(&attr);
4167 break;
4168 case BPF_MAP_DELETE_ELEM:
4169 err = map_delete_elem(&attr);
4170 break;
4171 case BPF_MAP_GET_NEXT_KEY:
4172 err = map_get_next_key(&attr);
4173 break;
4174 case BPF_MAP_FREEZE:
4175 err = map_freeze(&attr);
4176 break;
4177 case BPF_PROG_LOAD:
4178 err = bpf_prog_load(&attr, uattr);
4179 break;
4180 case BPF_OBJ_PIN:
4181 err = bpf_obj_pin(&attr);
4182 break;
4183 case BPF_OBJ_GET:
4184 err = bpf_obj_get(&attr);
4185 break;
4186 case BPF_PROG_ATTACH:
4187 err = bpf_prog_attach(&attr);
4188 break;
4189 case BPF_PROG_DETACH:
4190 err = bpf_prog_detach(&attr);
4191 break;
4192 case BPF_PROG_QUERY:
4193 err = bpf_prog_query(&attr, uattr);
4194 break;
4195 case BPF_PROG_TEST_RUN:
4196 err = bpf_prog_test_run(&attr, uattr);
4197 break;
4198 case BPF_PROG_GET_NEXT_ID:
4199 err = bpf_obj_get_next_id(&attr, uattr,
4200 &prog_idr, &prog_idr_lock);
4201 break;
4202 case BPF_MAP_GET_NEXT_ID:
4203 err = bpf_obj_get_next_id(&attr, uattr,
4204 &map_idr, &map_idr_lock);
4205 break;
4206 case BPF_BTF_GET_NEXT_ID:
4207 err = bpf_obj_get_next_id(&attr, uattr,
4208 &btf_idr, &btf_idr_lock);
4209 break;
4210 case BPF_PROG_GET_FD_BY_ID:
4211 err = bpf_prog_get_fd_by_id(&attr);
4212 break;
4213 case BPF_MAP_GET_FD_BY_ID:
4214 err = bpf_map_get_fd_by_id(&attr);
4215 break;
4216 case BPF_OBJ_GET_INFO_BY_FD:
4217 err = bpf_obj_get_info_by_fd(&attr, uattr);
4218 break;
4219 case BPF_RAW_TRACEPOINT_OPEN:
4220 err = bpf_raw_tracepoint_open(&attr);
4221 break;
4222 case BPF_BTF_LOAD:
4223 err = bpf_btf_load(&attr);
4224 break;
4225 case BPF_BTF_GET_FD_BY_ID:
4226 err = bpf_btf_get_fd_by_id(&attr);
4227 break;
4228 case BPF_TASK_FD_QUERY:
4229 err = bpf_task_fd_query(&attr, uattr);
4230 break;
4231 case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
4232 err = map_lookup_and_delete_elem(&attr);
4233 break;
4234 case BPF_MAP_LOOKUP_BATCH:
4235 err = bpf_map_do_batch(&attr, uattr, BPF_MAP_LOOKUP_BATCH);
4236 break;
4237 case BPF_MAP_LOOKUP_AND_DELETE_BATCH:
4238 err = bpf_map_do_batch(&attr, uattr,
4239 BPF_MAP_LOOKUP_AND_DELETE_BATCH);
4240 break;
4241 case BPF_MAP_UPDATE_BATCH:
4242 err = bpf_map_do_batch(&attr, uattr, BPF_MAP_UPDATE_BATCH);
4243 break;
4244 case BPF_MAP_DELETE_BATCH:
4245 err = bpf_map_do_batch(&attr, uattr, BPF_MAP_DELETE_BATCH);
4246 break;
4247 case BPF_LINK_CREATE:
4248 err = link_create(&attr);
4249 break;
4250 case BPF_LINK_UPDATE:
4251 err = link_update(&attr);
4252 break;
4253 case BPF_LINK_GET_FD_BY_ID:
4254 err = bpf_link_get_fd_by_id(&attr);
4255 break;
4256 case BPF_LINK_GET_NEXT_ID:
4257 err = bpf_obj_get_next_id(&attr, uattr,
4258 &link_idr, &link_idr_lock);
4259 break;
4260 case BPF_ENABLE_STATS:
4261 err = bpf_enable_stats(&attr);
4262 break;
4263 case BPF_ITER_CREATE:
4264 err = bpf_iter_create(&attr);
4265 break;
4266 case BPF_LINK_DETACH:
4267 err = link_detach(&attr);
4268 break;
4269 default:
4270 err = -EINVAL;
4271 break;
4272 }
4273
4274 return err;
4275 }
Linux with added FPC-III support