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leds: wm831x-status: fix use-after-free on unbind
[linux/fpc-iii.git] / kernel / bpf / syscall.c
blob0fd80ac81f705725a3ebc3234eadd4f7dae4d7cc
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_INET4_POST_BIND:
1985 case BPF_CGROUP_INET6_POST_BIND:
1986 return 0;
1987 default:
1988 return -EINVAL;
1989 }
1990 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1991 switch (expected_attach_type) {
1992 case BPF_CGROUP_INET4_BIND:
1993 case BPF_CGROUP_INET6_BIND:
1994 case BPF_CGROUP_INET4_CONNECT:
1995 case BPF_CGROUP_INET6_CONNECT:
1996 case BPF_CGROUP_INET4_GETPEERNAME:
1997 case BPF_CGROUP_INET6_GETPEERNAME:
1998 case BPF_CGROUP_INET4_GETSOCKNAME:
1999 case BPF_CGROUP_INET6_GETSOCKNAME:
2000 case BPF_CGROUP_UDP4_SENDMSG:
2001 case BPF_CGROUP_UDP6_SENDMSG:
2002 case BPF_CGROUP_UDP4_RECVMSG:
2003 case BPF_CGROUP_UDP6_RECVMSG:
2004 return 0;
2005 default:
2006 return -EINVAL;
2007 }
2008 case BPF_PROG_TYPE_CGROUP_SKB:
2009 switch (expected_attach_type) {
2010 case BPF_CGROUP_INET_INGRESS:
2011 case BPF_CGROUP_INET_EGRESS:
2012 return 0;
2013 default:
2014 return -EINVAL;
2015 }
2016 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2017 switch (expected_attach_type) {
2018 case BPF_CGROUP_SETSOCKOPT:
2019 case BPF_CGROUP_GETSOCKOPT:
2020 return 0;
2021 default:
2022 return -EINVAL;
2023 }
2024 case BPF_PROG_TYPE_EXT:
2025 if (expected_attach_type)
2026 return -EINVAL;
2027 /* fallthrough */
2028 default:
2029 return 0;
2030 }
2031 }
2032
2033 static bool is_net_admin_prog_type(enum bpf_prog_type prog_type)
2034 {
2035 switch (prog_type) {
2036 case BPF_PROG_TYPE_SCHED_CLS:
2037 case BPF_PROG_TYPE_SCHED_ACT:
2038 case BPF_PROG_TYPE_XDP:
2039 case BPF_PROG_TYPE_LWT_IN:
2040 case BPF_PROG_TYPE_LWT_OUT:
2041 case BPF_PROG_TYPE_LWT_XMIT:
2042 case BPF_PROG_TYPE_LWT_SEG6LOCAL:
2043 case BPF_PROG_TYPE_SK_SKB:
2044 case BPF_PROG_TYPE_SK_MSG:
2045 case BPF_PROG_TYPE_LIRC_MODE2:
2046 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2047 case BPF_PROG_TYPE_CGROUP_DEVICE:
2048 case BPF_PROG_TYPE_CGROUP_SOCK:
2049 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2050 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2051 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2052 case BPF_PROG_TYPE_SOCK_OPS:
2053 case BPF_PROG_TYPE_EXT: /* extends any prog */
2054 return true;
2055 case BPF_PROG_TYPE_CGROUP_SKB:
2056 /* always unpriv */
2057 case BPF_PROG_TYPE_SK_REUSEPORT:
2058 /* equivalent to SOCKET_FILTER. need CAP_BPF only */
2059 default:
2060 return false;
2061 }
2062 }
2063
2064 static bool is_perfmon_prog_type(enum bpf_prog_type prog_type)
2065 {
2066 switch (prog_type) {
2067 case BPF_PROG_TYPE_KPROBE:
2068 case BPF_PROG_TYPE_TRACEPOINT:
2069 case BPF_PROG_TYPE_PERF_EVENT:
2070 case BPF_PROG_TYPE_RAW_TRACEPOINT:
2071 case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
2072 case BPF_PROG_TYPE_TRACING:
2073 case BPF_PROG_TYPE_LSM:
2074 case BPF_PROG_TYPE_STRUCT_OPS: /* has access to struct sock */
2075 case BPF_PROG_TYPE_EXT: /* extends any prog */
2076 return true;
2077 default:
2078 return false;
2079 }
2080 }
2081
2082 /* last field in 'union bpf_attr' used by this command */
2083 #define BPF_PROG_LOAD_LAST_FIELD attach_prog_fd
2084
2085 static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
2086 {
2087 enum bpf_prog_type type = attr->prog_type;
2088 struct bpf_prog *prog;
2089 int err;
2090 char license[128];
2091 bool is_gpl;
2092
2093 if (CHECK_ATTR(BPF_PROG_LOAD))
2094 return -EINVAL;
2095
2096 if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
2097 BPF_F_ANY_ALIGNMENT |
2098 BPF_F_TEST_STATE_FREQ |
2099 BPF_F_TEST_RND_HI32))
2100 return -EINVAL;
2101
2102 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
2103 (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
2104 !bpf_capable())
2105 return -EPERM;
2106
2107 /* copy eBPF program license from user space */
2108 if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
2109 sizeof(license) - 1) < 0)
2110 return -EFAULT;
2111 license[sizeof(license) - 1] = 0;
2112
2113 /* eBPF programs must be GPL compatible to use GPL-ed functions */
2114 is_gpl = license_is_gpl_compatible(license);
2115
2116 if (attr->insn_cnt == 0 ||
2117 attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
2118 return -E2BIG;
2119 if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
2120 type != BPF_PROG_TYPE_CGROUP_SKB &&
2121 !bpf_capable())
2122 return -EPERM;
2123
2124 if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN) && !capable(CAP_SYS_ADMIN))
2125 return -EPERM;
2126 if (is_perfmon_prog_type(type) && !perfmon_capable())
2127 return -EPERM;
2128
2129 bpf_prog_load_fixup_attach_type(attr);
2130 if (bpf_prog_load_check_attach(type, attr->expected_attach_type,
2131 attr->attach_btf_id,
2132 attr->attach_prog_fd))
2133 return -EINVAL;
2134
2135 /* plain bpf_prog allocation */
2136 prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
2137 if (!prog)
2138 return -ENOMEM;
2139
2140 prog->expected_attach_type = attr->expected_attach_type;
2141 prog->aux->attach_btf_id = attr->attach_btf_id;
2142 if (attr->attach_prog_fd) {
2143 struct bpf_prog *tgt_prog;
2144
2145 tgt_prog = bpf_prog_get(attr->attach_prog_fd);
2146 if (IS_ERR(tgt_prog)) {
2147 err = PTR_ERR(tgt_prog);
2148 goto free_prog_nouncharge;
2149 }
2150 prog->aux->linked_prog = tgt_prog;
2151 }
2152
2153 prog->aux->offload_requested = !!attr->prog_ifindex;
2154
2155 err = security_bpf_prog_alloc(prog->aux);
2156 if (err)
2157 goto free_prog_nouncharge;
2158
2159 err = bpf_prog_charge_memlock(prog);
2160 if (err)
2161 goto free_prog_sec;
2162
2163 prog->len = attr->insn_cnt;
2164
2165 err = -EFAULT;
2166 if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
2167 bpf_prog_insn_size(prog)) != 0)
2168 goto free_prog;
2169
2170 prog->orig_prog = NULL;
2171 prog->jited = 0;
2172
2173 atomic64_set(&prog->aux->refcnt, 1);
2174 prog->gpl_compatible = is_gpl ? 1 : 0;
2175
2176 if (bpf_prog_is_dev_bound(prog->aux)) {
2177 err = bpf_prog_offload_init(prog, attr);
2178 if (err)
2179 goto free_prog;
2180 }
2181
2182 /* find program type: socket_filter vs tracing_filter */
2183 err = find_prog_type(type, prog);
2184 if (err < 0)
2185 goto free_prog;
2186
2187 prog->aux->load_time = ktime_get_boottime_ns();
2188 err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name,
2189 sizeof(attr->prog_name));
2190 if (err < 0)
2191 goto free_prog;
2192
2193 /* run eBPF verifier */
2194 err = bpf_check(&prog, attr, uattr);
2195 if (err < 0)
2196 goto free_used_maps;
2197
2198 prog = bpf_prog_select_runtime(prog, &err);
2199 if (err < 0)
2200 goto free_used_maps;
2201
2202 err = bpf_prog_alloc_id(prog);
2203 if (err)
2204 goto free_used_maps;
2205
2206 /* Upon success of bpf_prog_alloc_id(), the BPF prog is
2207 * effectively publicly exposed. However, retrieving via
2208 * bpf_prog_get_fd_by_id() will take another reference,
2209 * therefore it cannot be gone underneath us.
2210 *
2211 * Only for the time /after/ successful bpf_prog_new_fd()
2212 * and before returning to userspace, we might just hold
2213 * one reference and any parallel close on that fd could
2214 * rip everything out. Hence, below notifications must
2215 * happen before bpf_prog_new_fd().
2216 *
2217 * Also, any failure handling from this point onwards must
2218 * be using bpf_prog_put() given the program is exposed.
2219 */
2220 bpf_prog_kallsyms_add(prog);
2221 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
2222 bpf_audit_prog(prog, BPF_AUDIT_LOAD);
2223
2224 err = bpf_prog_new_fd(prog);
2225 if (err < 0)
2226 bpf_prog_put(prog);
2227 return err;
2228
2229 free_used_maps:
2230 /* In case we have subprogs, we need to wait for a grace
2231 * period before we can tear down JIT memory since symbols
2232 * are already exposed under kallsyms.
2233 */
2234 __bpf_prog_put_noref(prog, prog->aux->func_cnt);
2235 return err;
2236 free_prog:
2237 bpf_prog_uncharge_memlock(prog);
2238 free_prog_sec:
2239 security_bpf_prog_free(prog->aux);
2240 free_prog_nouncharge:
2241 bpf_prog_free(prog);
2242 return err;
2243 }
2244
2245 #define BPF_OBJ_LAST_FIELD file_flags
2246
2247 static int bpf_obj_pin(const union bpf_attr *attr)
2248 {
2249 if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
2250 return -EINVAL;
2251
2252 return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
2253 }
2254
2255 static int bpf_obj_get(const union bpf_attr *attr)
2256 {
2257 if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
2258 attr->file_flags & ~BPF_OBJ_FLAG_MASK)
2259 return -EINVAL;
2260
2261 return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
2262 attr->file_flags);
2263 }
2264
2265 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2266 const struct bpf_link_ops *ops, struct bpf_prog *prog)
2267 {
2268 atomic64_set(&link->refcnt, 1);
2269 link->type = type;
2270 link->id = 0;
2271 link->ops = ops;
2272 link->prog = prog;
2273 }
2274
2275 static void bpf_link_free_id(int id)
2276 {
2277 if (!id)
2278 return;
2279
2280 spin_lock_bh(&link_idr_lock);
2281 idr_remove(&link_idr, id);
2282 spin_unlock_bh(&link_idr_lock);
2283 }
2284
2285 /* Clean up bpf_link and corresponding anon_inode file and FD. After
2286 * anon_inode is created, bpf_link can't be just kfree()'d due to deferred
2287 * anon_inode's release() call. This helper marksbpf_link as
2288 * defunct, releases anon_inode file and puts reserved FD. bpf_prog's refcnt
2289 * is not decremented, it's the responsibility of a calling code that failed
2290 * to complete bpf_link initialization.
2291 */
2292 void bpf_link_cleanup(struct bpf_link_primer *primer)
2293 {
2294 primer->link->prog = NULL;
2295 bpf_link_free_id(primer->id);
2296 fput(primer->file);
2297 put_unused_fd(primer->fd);
2298 }
2299
2300 void bpf_link_inc(struct bpf_link *link)
2301 {
2302 atomic64_inc(&link->refcnt);
2303 }
2304
2305 /* bpf_link_free is guaranteed to be called from process context */
2306 static void bpf_link_free(struct bpf_link *link)
2307 {
2308 bpf_link_free_id(link->id);
2309 if (link->prog) {
2310 /* detach BPF program, clean up used resources */
2311 link->ops->release(link);
2312 bpf_prog_put(link->prog);
2313 }
2314 /* free bpf_link and its containing memory */
2315 link->ops->dealloc(link);
2316 }
2317
2318 static void bpf_link_put_deferred(struct work_struct *work)
2319 {
2320 struct bpf_link *link = container_of(work, struct bpf_link, work);
2321
2322 bpf_link_free(link);
2323 }
2324
2325 /* bpf_link_put can be called from atomic context, but ensures that resources
2326 * are freed from process context
2327 */
2328 void bpf_link_put(struct bpf_link *link)
2329 {
2330 if (!atomic64_dec_and_test(&link->refcnt))
2331 return;
2332
2333 if (in_atomic()) {
2334 INIT_WORK(&link->work, bpf_link_put_deferred);
2335 schedule_work(&link->work);
2336 } else {
2337 bpf_link_free(link);
2338 }
2339 }
2340
2341 static int bpf_link_release(struct inode *inode, struct file *filp)
2342 {
2343 struct bpf_link *link = filp->private_data;
2344
2345 bpf_link_put(link);
2346 return 0;
2347 }
2348
2349 #ifdef CONFIG_PROC_FS
2350 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
2351 #define BPF_MAP_TYPE(_id, _ops)
2352 #define BPF_LINK_TYPE(_id, _name) [_id] = #_name,
2353 static const char *bpf_link_type_strs[] = {
2354 [BPF_LINK_TYPE_UNSPEC] = "<invalid>",
2355 #include <linux/bpf_types.h>
2356 };
2357 #undef BPF_PROG_TYPE
2358 #undef BPF_MAP_TYPE
2359 #undef BPF_LINK_TYPE
2360
2361 static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
2362 {
2363 const struct bpf_link *link = filp->private_data;
2364 const struct bpf_prog *prog = link->prog;
2365 char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
2366
2367 bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
2368 seq_printf(m,
2369 "link_type:\t%s\n"
2370 "link_id:\t%u\n"
2371 "prog_tag:\t%s\n"
2372 "prog_id:\t%u\n",
2373 bpf_link_type_strs[link->type],
2374 link->id,
2375 prog_tag,
2376 prog->aux->id);
2377 if (link->ops->show_fdinfo)
2378 link->ops->show_fdinfo(link, m);
2379 }
2380 #endif
2381
2382 static const struct file_operations bpf_link_fops = {
2383 #ifdef CONFIG_PROC_FS
2384 .show_fdinfo = bpf_link_show_fdinfo,
2385 #endif
2386 .release = bpf_link_release,
2387 .read = bpf_dummy_read,
2388 .write = bpf_dummy_write,
2389 };
2390
2391 static int bpf_link_alloc_id(struct bpf_link *link)
2392 {
2393 int id;
2394
2395 idr_preload(GFP_KERNEL);
2396 spin_lock_bh(&link_idr_lock);
2397 id = idr_alloc_cyclic(&link_idr, link, 1, INT_MAX, GFP_ATOMIC);
2398 spin_unlock_bh(&link_idr_lock);
2399 idr_preload_end();
2400
2401 return id;
2402 }
2403
2404 /* Prepare bpf_link to be exposed to user-space by allocating anon_inode file,
2405 * reserving unused FD and allocating ID from link_idr. This is to be paired
2406 * with bpf_link_settle() to install FD and ID and expose bpf_link to
2407 * user-space, if bpf_link is successfully attached. If not, bpf_link and
2408 * pre-allocated resources are to be freed with bpf_cleanup() call. All the
2409 * transient state is passed around in struct bpf_link_primer.
2410 * This is preferred way to create and initialize bpf_link, especially when
2411 * there are complicated and expensive operations inbetween creating bpf_link
2412 * itself and attaching it to BPF hook. By using bpf_link_prime() and
2413 * bpf_link_settle() kernel code using bpf_link doesn't have to perform
2414 * expensive (and potentially failing) roll back operations in a rare case
2415 * that file, FD, or ID can't be allocated.
2416 */
2417 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer)
2418 {
2419 struct file *file;
2420 int fd, id;
2421
2422 fd = get_unused_fd_flags(O_CLOEXEC);
2423 if (fd < 0)
2424 return fd;
2425
2426
2427 id = bpf_link_alloc_id(link);
2428 if (id < 0) {
2429 put_unused_fd(fd);
2430 return id;
2431 }
2432
2433 file = anon_inode_getfile("bpf_link", &bpf_link_fops, link, O_CLOEXEC);
2434 if (IS_ERR(file)) {
2435 bpf_link_free_id(id);
2436 put_unused_fd(fd);
2437 return PTR_ERR(file);
2438 }
2439
2440 primer->link = link;
2441 primer->file = file;
2442 primer->fd = fd;
2443 primer->id = id;
2444 return 0;
2445 }
2446
2447 int bpf_link_settle(struct bpf_link_primer *primer)
2448 {
2449 /* make bpf_link fetchable by ID */
2450 spin_lock_bh(&link_idr_lock);
2451 primer->link->id = primer->id;
2452 spin_unlock_bh(&link_idr_lock);
2453 /* make bpf_link fetchable by FD */
2454 fd_install(primer->fd, primer->file);
2455 /* pass through installed FD */
2456 return primer->fd;
2457 }
2458
2459 int bpf_link_new_fd(struct bpf_link *link)
2460 {
2461 return anon_inode_getfd("bpf-link", &bpf_link_fops, link, O_CLOEXEC);
2462 }
2463
2464 struct bpf_link *bpf_link_get_from_fd(u32 ufd)
2465 {
2466 struct fd f = fdget(ufd);
2467 struct bpf_link *link;
2468
2469 if (!f.file)
2470 return ERR_PTR(-EBADF);
2471 if (f.file->f_op != &bpf_link_fops) {
2472 fdput(f);
2473 return ERR_PTR(-EINVAL);
2474 }
2475
2476 link = f.file->private_data;
2477 bpf_link_inc(link);
2478 fdput(f);
2479
2480 return link;
2481 }
2482
2483 struct bpf_tracing_link {
2484 struct bpf_link link;
2485 enum bpf_attach_type attach_type;
2486 };
2487
2488 static void bpf_tracing_link_release(struct bpf_link *link)
2489 {
2490 WARN_ON_ONCE(bpf_trampoline_unlink_prog(link->prog));
2491 }
2492
2493 static void bpf_tracing_link_dealloc(struct bpf_link *link)
2494 {
2495 struct bpf_tracing_link *tr_link =
2496 container_of(link, struct bpf_tracing_link, link);
2497
2498 kfree(tr_link);
2499 }
2500
2501 static void bpf_tracing_link_show_fdinfo(const struct bpf_link *link,
2502 struct seq_file *seq)
2503 {
2504 struct bpf_tracing_link *tr_link =
2505 container_of(link, struct bpf_tracing_link, link);
2506
2507 seq_printf(seq,
2508 "attach_type:\t%d\n",
2509 tr_link->attach_type);
2510 }
2511
2512 static int bpf_tracing_link_fill_link_info(const struct bpf_link *link,
2513 struct bpf_link_info *info)
2514 {
2515 struct bpf_tracing_link *tr_link =
2516 container_of(link, struct bpf_tracing_link, link);
2517
2518 info->tracing.attach_type = tr_link->attach_type;
2519
2520 return 0;
2521 }
2522
2523 static const struct bpf_link_ops bpf_tracing_link_lops = {
2524 .release = bpf_tracing_link_release,
2525 .dealloc = bpf_tracing_link_dealloc,
2526 .show_fdinfo = bpf_tracing_link_show_fdinfo,
2527 .fill_link_info = bpf_tracing_link_fill_link_info,
2528 };
2529
2530 static int bpf_tracing_prog_attach(struct bpf_prog *prog)
2531 {
2532 struct bpf_link_primer link_primer;
2533 struct bpf_tracing_link *link;
2534 int err;
2535
2536 switch (prog->type) {
2537 case BPF_PROG_TYPE_TRACING:
2538 if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
2539 prog->expected_attach_type != BPF_TRACE_FEXIT &&
2540 prog->expected_attach_type != BPF_MODIFY_RETURN) {
2541 err = -EINVAL;
2542 goto out_put_prog;
2543 }
2544 break;
2545 case BPF_PROG_TYPE_EXT:
2546 if (prog->expected_attach_type != 0) {
2547 err = -EINVAL;
2548 goto out_put_prog;
2549 }
2550 break;
2551 case BPF_PROG_TYPE_LSM:
2552 if (prog->expected_attach_type != BPF_LSM_MAC) {
2553 err = -EINVAL;
2554 goto out_put_prog;
2555 }
2556 break;
2557 default:
2558 err = -EINVAL;
2559 goto out_put_prog;
2560 }
2561
2562 link = kzalloc(sizeof(*link), GFP_USER);
2563 if (!link) {
2564 err = -ENOMEM;
2565 goto out_put_prog;
2566 }
2567 bpf_link_init(&link->link, BPF_LINK_TYPE_TRACING,
2568 &bpf_tracing_link_lops, prog);
2569 link->attach_type = prog->expected_attach_type;
2570
2571 err = bpf_link_prime(&link->link, &link_primer);
2572 if (err) {
2573 kfree(link);
2574 goto out_put_prog;
2575 }
2576
2577 err = bpf_trampoline_link_prog(prog);
2578 if (err) {
2579 bpf_link_cleanup(&link_primer);
2580 goto out_put_prog;
2581 }
2582
2583 return bpf_link_settle(&link_primer);
2584 out_put_prog:
2585 bpf_prog_put(prog);
2586 return err;
2587 }
2588
2589 struct bpf_raw_tp_link {
2590 struct bpf_link link;
2591 struct bpf_raw_event_map *btp;
2592 };
2593
2594 static void bpf_raw_tp_link_release(struct bpf_link *link)
2595 {
2596 struct bpf_raw_tp_link *raw_tp =
2597 container_of(link, struct bpf_raw_tp_link, link);
2598
2599 bpf_probe_unregister(raw_tp->btp, raw_tp->link.prog);
2600 bpf_put_raw_tracepoint(raw_tp->btp);
2601 }
2602
2603 static void bpf_raw_tp_link_dealloc(struct bpf_link *link)
2604 {
2605 struct bpf_raw_tp_link *raw_tp =
2606 container_of(link, struct bpf_raw_tp_link, link);
2607
2608 kfree(raw_tp);
2609 }
2610
2611 static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
2612 struct seq_file *seq)
2613 {
2614 struct bpf_raw_tp_link *raw_tp_link =
2615 container_of(link, struct bpf_raw_tp_link, link);
2616
2617 seq_printf(seq,
2618 "tp_name:\t%s\n",
2619 raw_tp_link->btp->tp->name);
2620 }
2621
2622 static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
2623 struct bpf_link_info *info)
2624 {
2625 struct bpf_raw_tp_link *raw_tp_link =
2626 container_of(link, struct bpf_raw_tp_link, link);
2627 char __user *ubuf = u64_to_user_ptr(info->raw_tracepoint.tp_name);
2628 const char *tp_name = raw_tp_link->btp->tp->name;
2629 u32 ulen = info->raw_tracepoint.tp_name_len;
2630 size_t tp_len = strlen(tp_name);
2631
2632 if (ulen && !ubuf)
2633 return -EINVAL;
2634
2635 info->raw_tracepoint.tp_name_len = tp_len + 1;
2636
2637 if (!ubuf)
2638 return 0;
2639
2640 if (ulen >= tp_len + 1) {
2641 if (copy_to_user(ubuf, tp_name, tp_len + 1))
2642 return -EFAULT;
2643 } else {
2644 char zero = '\0';
2645
2646 if (copy_to_user(ubuf, tp_name, ulen - 1))
2647 return -EFAULT;
2648 if (put_user(zero, ubuf + ulen - 1))
2649 return -EFAULT;
2650 return -ENOSPC;
2651 }
2652
2653 return 0;
2654 }
2655
2656 static const struct bpf_link_ops bpf_raw_tp_link_lops = {
2657 .release = bpf_raw_tp_link_release,
2658 .dealloc = bpf_raw_tp_link_dealloc,
2659 .show_fdinfo = bpf_raw_tp_link_show_fdinfo,
2660 .fill_link_info = bpf_raw_tp_link_fill_link_info,
2661 };
2662
2663 #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
2664
2665 static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
2666 {
2667 struct bpf_link_primer link_primer;
2668 struct bpf_raw_tp_link *link;
2669 struct bpf_raw_event_map *btp;
2670 struct bpf_prog *prog;
2671 const char *tp_name;
2672 char buf[128];
2673 int err;
2674
2675 if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN))
2676 return -EINVAL;
2677
2678 prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
2679 if (IS_ERR(prog))
2680 return PTR_ERR(prog);
2681
2682 switch (prog->type) {
2683 case BPF_PROG_TYPE_TRACING:
2684 case BPF_PROG_TYPE_EXT:
2685 case BPF_PROG_TYPE_LSM:
2686 if (attr->raw_tracepoint.name) {
2687 /* The attach point for this category of programs
2688 * should be specified via btf_id during program load.
2689 */
2690 err = -EINVAL;
2691 goto out_put_prog;
2692 }
2693 if (prog->type == BPF_PROG_TYPE_TRACING &&
2694 prog->expected_attach_type == BPF_TRACE_RAW_TP) {
2695 tp_name = prog->aux->attach_func_name;
2696 break;
2697 }
2698 return bpf_tracing_prog_attach(prog);
2699 case BPF_PROG_TYPE_RAW_TRACEPOINT:
2700 case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
2701 if (strncpy_from_user(buf,
2702 u64_to_user_ptr(attr->raw_tracepoint.name),
2703 sizeof(buf) - 1) < 0) {
2704 err = -EFAULT;
2705 goto out_put_prog;
2706 }
2707 buf[sizeof(buf) - 1] = 0;
2708 tp_name = buf;
2709 break;
2710 default:
2711 err = -EINVAL;
2712 goto out_put_prog;
2713 }
2714
2715 btp = bpf_get_raw_tracepoint(tp_name);
2716 if (!btp) {
2717 err = -ENOENT;
2718 goto out_put_prog;
2719 }
2720
2721 link = kzalloc(sizeof(*link), GFP_USER);
2722 if (!link) {
2723 err = -ENOMEM;
2724 goto out_put_btp;
2725 }
2726 bpf_link_init(&link->link, BPF_LINK_TYPE_RAW_TRACEPOINT,
2727 &bpf_raw_tp_link_lops, prog);
2728 link->btp = btp;
2729
2730 err = bpf_link_prime(&link->link, &link_primer);
2731 if (err) {
2732 kfree(link);
2733 goto out_put_btp;
2734 }
2735
2736 err = bpf_probe_register(link->btp, prog);
2737 if (err) {
2738 bpf_link_cleanup(&link_primer);
2739 goto out_put_btp;
2740 }
2741
2742 return bpf_link_settle(&link_primer);
2743
2744 out_put_btp:
2745 bpf_put_raw_tracepoint(btp);
2746 out_put_prog:
2747 bpf_prog_put(prog);
2748 return err;
2749 }
2750
2751 static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
2752 enum bpf_attach_type attach_type)
2753 {
2754 switch (prog->type) {
2755 case BPF_PROG_TYPE_CGROUP_SOCK:
2756 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2757 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2758 return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
2759 case BPF_PROG_TYPE_CGROUP_SKB:
2760 if (!capable(CAP_NET_ADMIN))
2761 /* cg-skb progs can be loaded by unpriv user.
2762 * check permissions at attach time.
2763 */
2764 return -EPERM;
2765 return prog->enforce_expected_attach_type &&
2766 prog->expected_attach_type != attach_type ?
2767 -EINVAL : 0;
2768 default:
2769 return 0;
2770 }
2771 }
2772
2773 static enum bpf_prog_type
2774 attach_type_to_prog_type(enum bpf_attach_type attach_type)
2775 {
2776 switch (attach_type) {
2777 case BPF_CGROUP_INET_INGRESS:
2778 case BPF_CGROUP_INET_EGRESS:
2779 return BPF_PROG_TYPE_CGROUP_SKB;
2780 break;
2781 case BPF_CGROUP_INET_SOCK_CREATE:
2782 case BPF_CGROUP_INET4_POST_BIND:
2783 case BPF_CGROUP_INET6_POST_BIND:
2784 return BPF_PROG_TYPE_CGROUP_SOCK;
2785 case BPF_CGROUP_INET4_BIND:
2786 case BPF_CGROUP_INET6_BIND:
2787 case BPF_CGROUP_INET4_CONNECT:
2788 case BPF_CGROUP_INET6_CONNECT:
2789 case BPF_CGROUP_INET4_GETPEERNAME:
2790 case BPF_CGROUP_INET6_GETPEERNAME:
2791 case BPF_CGROUP_INET4_GETSOCKNAME:
2792 case BPF_CGROUP_INET6_GETSOCKNAME:
2793 case BPF_CGROUP_UDP4_SENDMSG:
2794 case BPF_CGROUP_UDP6_SENDMSG:
2795 case BPF_CGROUP_UDP4_RECVMSG:
2796 case BPF_CGROUP_UDP6_RECVMSG:
2797 return BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
2798 case BPF_CGROUP_SOCK_OPS:
2799 return BPF_PROG_TYPE_SOCK_OPS;
2800 case BPF_CGROUP_DEVICE:
2801 return BPF_PROG_TYPE_CGROUP_DEVICE;
2802 case BPF_SK_MSG_VERDICT:
2803 return BPF_PROG_TYPE_SK_MSG;
2804 case BPF_SK_SKB_STREAM_PARSER:
2805 case BPF_SK_SKB_STREAM_VERDICT:
2806 return BPF_PROG_TYPE_SK_SKB;
2807 case BPF_LIRC_MODE2:
2808 return BPF_PROG_TYPE_LIRC_MODE2;
2809 case BPF_FLOW_DISSECTOR:
2810 return BPF_PROG_TYPE_FLOW_DISSECTOR;
2811 case BPF_CGROUP_SYSCTL:
2812 return BPF_PROG_TYPE_CGROUP_SYSCTL;
2813 case BPF_CGROUP_GETSOCKOPT:
2814 case BPF_CGROUP_SETSOCKOPT:
2815 return BPF_PROG_TYPE_CGROUP_SOCKOPT;
2816 case BPF_TRACE_ITER:
2817 return BPF_PROG_TYPE_TRACING;
2818 default:
2819 return BPF_PROG_TYPE_UNSPEC;
2820 }
2821 }
2822
2823 #define BPF_PROG_ATTACH_LAST_FIELD replace_bpf_fd
2824
2825 #define BPF_F_ATTACH_MASK \
2826 (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI | BPF_F_REPLACE)
2827
2828 static int bpf_prog_attach(const union bpf_attr *attr)
2829 {
2830 enum bpf_prog_type ptype;
2831 struct bpf_prog *prog;
2832 int ret;
2833
2834 if (CHECK_ATTR(BPF_PROG_ATTACH))
2835 return -EINVAL;
2836
2837 if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
2838 return -EINVAL;
2839
2840 ptype = attach_type_to_prog_type(attr->attach_type);
2841 if (ptype == BPF_PROG_TYPE_UNSPEC)
2842 return -EINVAL;
2843
2844 prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
2845 if (IS_ERR(prog))
2846 return PTR_ERR(prog);
2847
2848 if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
2849 bpf_prog_put(prog);
2850 return -EINVAL;
2851 }
2852
2853 switch (ptype) {
2854 case BPF_PROG_TYPE_SK_SKB:
2855 case BPF_PROG_TYPE_SK_MSG:
2856 ret = sock_map_get_from_fd(attr, prog);
2857 break;
2858 case BPF_PROG_TYPE_LIRC_MODE2:
2859 ret = lirc_prog_attach(attr, prog);
2860 break;
2861 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2862 ret = netns_bpf_prog_attach(attr, prog);
2863 break;
2864 case BPF_PROG_TYPE_CGROUP_DEVICE:
2865 case BPF_PROG_TYPE_CGROUP_SKB:
2866 case BPF_PROG_TYPE_CGROUP_SOCK:
2867 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2868 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2869 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2870 case BPF_PROG_TYPE_SOCK_OPS:
2871 ret = cgroup_bpf_prog_attach(attr, ptype, prog);
2872 break;
2873 default:
2874 ret = -EINVAL;
2875 }
2876
2877 if (ret)
2878 bpf_prog_put(prog);
2879 return ret;
2880 }
2881
2882 #define BPF_PROG_DETACH_LAST_FIELD attach_type
2883
2884 static int bpf_prog_detach(const union bpf_attr *attr)
2885 {
2886 enum bpf_prog_type ptype;
2887
2888 if (CHECK_ATTR(BPF_PROG_DETACH))
2889 return -EINVAL;
2890
2891 ptype = attach_type_to_prog_type(attr->attach_type);
2892
2893 switch (ptype) {
2894 case BPF_PROG_TYPE_SK_MSG:
2895 case BPF_PROG_TYPE_SK_SKB:
2896 return sock_map_prog_detach(attr, ptype);
2897 case BPF_PROG_TYPE_LIRC_MODE2:
2898 return lirc_prog_detach(attr);
2899 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2900 return netns_bpf_prog_detach(attr, ptype);
2901 case BPF_PROG_TYPE_CGROUP_DEVICE:
2902 case BPF_PROG_TYPE_CGROUP_SKB:
2903 case BPF_PROG_TYPE_CGROUP_SOCK:
2904 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2905 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2906 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2907 case BPF_PROG_TYPE_SOCK_OPS:
2908 return cgroup_bpf_prog_detach(attr, ptype);
2909 default:
2910 return -EINVAL;
2911 }
2912 }
2913
2914 #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
2915
2916 static int bpf_prog_query(const union bpf_attr *attr,
2917 union bpf_attr __user *uattr)
2918 {
2919 if (!capable(CAP_NET_ADMIN))
2920 return -EPERM;
2921 if (CHECK_ATTR(BPF_PROG_QUERY))
2922 return -EINVAL;
2923 if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
2924 return -EINVAL;
2925
2926 switch (attr->query.attach_type) {
2927 case BPF_CGROUP_INET_INGRESS:
2928 case BPF_CGROUP_INET_EGRESS:
2929 case BPF_CGROUP_INET_SOCK_CREATE:
2930 case BPF_CGROUP_INET4_BIND:
2931 case BPF_CGROUP_INET6_BIND:
2932 case BPF_CGROUP_INET4_POST_BIND:
2933 case BPF_CGROUP_INET6_POST_BIND:
2934 case BPF_CGROUP_INET4_CONNECT:
2935 case BPF_CGROUP_INET6_CONNECT:
2936 case BPF_CGROUP_INET4_GETPEERNAME:
2937 case BPF_CGROUP_INET6_GETPEERNAME:
2938 case BPF_CGROUP_INET4_GETSOCKNAME:
2939 case BPF_CGROUP_INET6_GETSOCKNAME:
2940 case BPF_CGROUP_UDP4_SENDMSG:
2941 case BPF_CGROUP_UDP6_SENDMSG:
2942 case BPF_CGROUP_UDP4_RECVMSG:
2943 case BPF_CGROUP_UDP6_RECVMSG:
2944 case BPF_CGROUP_SOCK_OPS:
2945 case BPF_CGROUP_DEVICE:
2946 case BPF_CGROUP_SYSCTL:
2947 case BPF_CGROUP_GETSOCKOPT:
2948 case BPF_CGROUP_SETSOCKOPT:
2949 return cgroup_bpf_prog_query(attr, uattr);
2950 case BPF_LIRC_MODE2:
2951 return lirc_prog_query(attr, uattr);
2952 case BPF_FLOW_DISSECTOR:
2953 return netns_bpf_prog_query(attr, uattr);
2954 default:
2955 return -EINVAL;
2956 }
2957 }
2958
2959 #define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out
2960
2961 static int bpf_prog_test_run(const union bpf_attr *attr,
2962 union bpf_attr __user *uattr)
2963 {
2964 struct bpf_prog *prog;
2965 int ret = -ENOTSUPP;
2966
2967 if (CHECK_ATTR(BPF_PROG_TEST_RUN))
2968 return -EINVAL;
2969
2970 if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
2971 (!attr->test.ctx_size_in && attr->test.ctx_in))
2972 return -EINVAL;
2973
2974 if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
2975 (!attr->test.ctx_size_out && attr->test.ctx_out))
2976 return -EINVAL;
2977
2978 prog = bpf_prog_get(attr->test.prog_fd);
2979 if (IS_ERR(prog))
2980 return PTR_ERR(prog);
2981
2982 if (prog->aux->ops->test_run)
2983 ret = prog->aux->ops->test_run(prog, attr, uattr);
2984
2985 bpf_prog_put(prog);
2986 return ret;
2987 }
2988
2989 #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
2990
2991 static int bpf_obj_get_next_id(const union bpf_attr *attr,
2992 union bpf_attr __user *uattr,
2993 struct idr *idr,
2994 spinlock_t *lock)
2995 {
2996 u32 next_id = attr->start_id;
2997 int err = 0;
2998
2999 if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
3000 return -EINVAL;
3001
3002 if (!capable(CAP_SYS_ADMIN))
3003 return -EPERM;
3004
3005 next_id++;
3006 spin_lock_bh(lock);
3007 if (!idr_get_next(idr, &next_id))
3008 err = -ENOENT;
3009 spin_unlock_bh(lock);
3010
3011 if (!err)
3012 err = put_user(next_id, &uattr->next_id);
3013
3014 return err;
3015 }
3016
3017 struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
3018 {
3019 struct bpf_map *map;
3020
3021 spin_lock_bh(&map_idr_lock);
3022 again:
3023 map = idr_get_next(&map_idr, id);
3024 if (map) {
3025 map = __bpf_map_inc_not_zero(map, false);
3026 if (IS_ERR(map)) {
3027 (*id)++;
3028 goto again;
3029 }
3030 }
3031 spin_unlock_bh(&map_idr_lock);
3032
3033 return map;
3034 }
3035
3036 #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
3037
3038 struct bpf_prog *bpf_prog_by_id(u32 id)
3039 {
3040 struct bpf_prog *prog;
3041
3042 if (!id)
3043 return ERR_PTR(-ENOENT);
3044
3045 spin_lock_bh(&prog_idr_lock);
3046 prog = idr_find(&prog_idr, id);
3047 if (prog)
3048 prog = bpf_prog_inc_not_zero(prog);
3049 else
3050 prog = ERR_PTR(-ENOENT);
3051 spin_unlock_bh(&prog_idr_lock);
3052 return prog;
3053 }
3054
3055 static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
3056 {
3057 struct bpf_prog *prog;
3058 u32 id = attr->prog_id;
3059 int fd;
3060
3061 if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
3062 return -EINVAL;
3063
3064 if (!capable(CAP_SYS_ADMIN))
3065 return -EPERM;
3066
3067 prog = bpf_prog_by_id(id);
3068 if (IS_ERR(prog))
3069 return PTR_ERR(prog);
3070
3071 fd = bpf_prog_new_fd(prog);
3072 if (fd < 0)
3073 bpf_prog_put(prog);
3074
3075 return fd;
3076 }
3077
3078 #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
3079
3080 static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
3081 {
3082 struct bpf_map *map;
3083 u32 id = attr->map_id;
3084 int f_flags;
3085 int fd;
3086
3087 if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
3088 attr->open_flags & ~BPF_OBJ_FLAG_MASK)
3089 return -EINVAL;
3090
3091 if (!capable(CAP_SYS_ADMIN))
3092 return -EPERM;
3093
3094 f_flags = bpf_get_file_flag(attr->open_flags);
3095 if (f_flags < 0)
3096 return f_flags;
3097
3098 spin_lock_bh(&map_idr_lock);
3099 map = idr_find(&map_idr, id);
3100 if (map)
3101 map = __bpf_map_inc_not_zero(map, true);
3102 else
3103 map = ERR_PTR(-ENOENT);
3104 spin_unlock_bh(&map_idr_lock);
3105
3106 if (IS_ERR(map))
3107 return PTR_ERR(map);
3108
3109 fd = bpf_map_new_fd(map, f_flags);
3110 if (fd < 0)
3111 bpf_map_put_with_uref(map);
3112
3113 return fd;
3114 }
3115
3116 static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
3117 unsigned long addr, u32 *off,
3118 u32 *type)
3119 {
3120 const struct bpf_map *map;
3121 int i;
3122
3123 for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
3124 map = prog->aux->used_maps[i];
3125 if (map == (void *)addr) {
3126 *type = BPF_PSEUDO_MAP_FD;
3127 return map;
3128 }
3129 if (!map->ops->map_direct_value_meta)
3130 continue;
3131 if (!map->ops->map_direct_value_meta(map, addr, off)) {
3132 *type = BPF_PSEUDO_MAP_VALUE;
3133 return map;
3134 }
3135 }
3136
3137 return NULL;
3138 }
3139
3140 static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
3141 const struct cred *f_cred)
3142 {
3143 const struct bpf_map *map;
3144 struct bpf_insn *insns;
3145 u32 off, type;
3146 u64 imm;
3147 u8 code;
3148 int i;
3149
3150 insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
3151 GFP_USER);
3152 if (!insns)
3153 return insns;
3154
3155 for (i = 0; i < prog->len; i++) {
3156 code = insns[i].code;
3157
3158 if (code == (BPF_JMP | BPF_TAIL_CALL)) {
3159 insns[i].code = BPF_JMP | BPF_CALL;
3160 insns[i].imm = BPF_FUNC_tail_call;
3161 /* fall-through */
3162 }
3163 if (code == (BPF_JMP | BPF_CALL) ||
3164 code == (BPF_JMP | BPF_CALL_ARGS)) {
3165 if (code == (BPF_JMP | BPF_CALL_ARGS))
3166 insns[i].code = BPF_JMP | BPF_CALL;
3167 if (!bpf_dump_raw_ok(f_cred))
3168 insns[i].imm = 0;
3169 continue;
3170 }
3171 if (BPF_CLASS(code) == BPF_LDX && BPF_MODE(code) == BPF_PROBE_MEM) {
3172 insns[i].code = BPF_LDX | BPF_SIZE(code) | BPF_MEM;
3173 continue;
3174 }
3175
3176 if (code != (BPF_LD | BPF_IMM | BPF_DW))
3177 continue;
3178
3179 imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
3180 map = bpf_map_from_imm(prog, imm, &off, &type);
3181 if (map) {
3182 insns[i].src_reg = type;
3183 insns[i].imm = map->id;
3184 insns[i + 1].imm = off;
3185 continue;
3186 }
3187 }
3188
3189 return insns;
3190 }
3191
3192 static int set_info_rec_size(struct bpf_prog_info *info)
3193 {
3194 /*
3195 * Ensure info.*_rec_size is the same as kernel expected size
3196 *
3197 * or
3198 *
3199 * Only allow zero *_rec_size if both _rec_size and _cnt are
3200 * zero. In this case, the kernel will set the expected
3201 * _rec_size back to the info.
3202 */
3203
3204 if ((info->nr_func_info || info->func_info_rec_size) &&
3205 info->func_info_rec_size != sizeof(struct bpf_func_info))
3206 return -EINVAL;
3207
3208 if ((info->nr_line_info || info->line_info_rec_size) &&
3209 info->line_info_rec_size != sizeof(struct bpf_line_info))
3210 return -EINVAL;
3211
3212 if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
3213 info->jited_line_info_rec_size != sizeof(__u64))
3214 return -EINVAL;
3215
3216 info->func_info_rec_size = sizeof(struct bpf_func_info);
3217 info->line_info_rec_size = sizeof(struct bpf_line_info);
3218 info->jited_line_info_rec_size = sizeof(__u64);
3219
3220 return 0;
3221 }
3222
3223 static int bpf_prog_get_info_by_fd(struct file *file,
3224 struct bpf_prog *prog,
3225 const union bpf_attr *attr,
3226 union bpf_attr __user *uattr)
3227 {
3228 struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3229 struct bpf_prog_info info;
3230 u32 info_len = attr->info.info_len;
3231 struct bpf_prog_stats stats;
3232 char __user *uinsns;
3233 u32 ulen;
3234 int err;
3235
3236 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
3237 if (err)
3238 return err;
3239 info_len = min_t(u32, sizeof(info), info_len);
3240
3241 memset(&info, 0, sizeof(info));
3242 if (copy_from_user(&info, uinfo, info_len))
3243 return -EFAULT;
3244
3245 info.type = prog->type;
3246 info.id = prog->aux->id;
3247 info.load_time = prog->aux->load_time;
3248 info.created_by_uid = from_kuid_munged(current_user_ns(),
3249 prog->aux->user->uid);
3250 info.gpl_compatible = prog->gpl_compatible;
3251
3252 memcpy(info.tag, prog->tag, sizeof(prog->tag));
3253 memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
3254
3255 ulen = info.nr_map_ids;
3256 info.nr_map_ids = prog->aux->used_map_cnt;
3257 ulen = min_t(u32, info.nr_map_ids, ulen);
3258 if (ulen) {
3259 u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
3260 u32 i;
3261
3262 for (i = 0; i < ulen; i++)
3263 if (put_user(prog->aux->used_maps[i]->id,
3264 &user_map_ids[i]))
3265 return -EFAULT;
3266 }
3267
3268 err = set_info_rec_size(&info);
3269 if (err)
3270 return err;
3271
3272 bpf_prog_get_stats(prog, &stats);
3273 info.run_time_ns = stats.nsecs;
3274 info.run_cnt = stats.cnt;
3275
3276 if (!bpf_capable()) {
3277 info.jited_prog_len = 0;
3278 info.xlated_prog_len = 0;
3279 info.nr_jited_ksyms = 0;
3280 info.nr_jited_func_lens = 0;
3281 info.nr_func_info = 0;
3282 info.nr_line_info = 0;
3283 info.nr_jited_line_info = 0;
3284 goto done;
3285 }
3286
3287 ulen = info.xlated_prog_len;
3288 info.xlated_prog_len = bpf_prog_insn_size(prog);
3289 if (info.xlated_prog_len && ulen) {
3290 struct bpf_insn *insns_sanitized;
3291 bool fault;
3292
3293 if (prog->blinded && !bpf_dump_raw_ok(file->f_cred)) {
3294 info.xlated_prog_insns = 0;
3295 goto done;
3296 }
3297 insns_sanitized = bpf_insn_prepare_dump(prog, file->f_cred);
3298 if (!insns_sanitized)
3299 return -ENOMEM;
3300 uinsns = u64_to_user_ptr(info.xlated_prog_insns);
3301 ulen = min_t(u32, info.xlated_prog_len, ulen);
3302 fault = copy_to_user(uinsns, insns_sanitized, ulen);
3303 kfree(insns_sanitized);
3304 if (fault)
3305 return -EFAULT;
3306 }
3307
3308 if (bpf_prog_is_dev_bound(prog->aux)) {
3309 err = bpf_prog_offload_info_fill(&info, prog);
3310 if (err)
3311 return err;
3312 goto done;
3313 }
3314
3315 /* NOTE: the following code is supposed to be skipped for offload.
3316 * bpf_prog_offload_info_fill() is the place to fill similar fields
3317 * for offload.
3318 */
3319 ulen = info.jited_prog_len;
3320 if (prog->aux->func_cnt) {
3321 u32 i;
3322
3323 info.jited_prog_len = 0;
3324 for (i = 0; i < prog->aux->func_cnt; i++)
3325 info.jited_prog_len += prog->aux->func[i]->jited_len;
3326 } else {
3327 info.jited_prog_len = prog->jited_len;
3328 }
3329
3330 if (info.jited_prog_len && ulen) {
3331 if (bpf_dump_raw_ok(file->f_cred)) {
3332 uinsns = u64_to_user_ptr(info.jited_prog_insns);
3333 ulen = min_t(u32, info.jited_prog_len, ulen);
3334
3335 /* for multi-function programs, copy the JITed
3336 * instructions for all the functions
3337 */
3338 if (prog->aux->func_cnt) {
3339 u32 len, free, i;
3340 u8 *img;
3341
3342 free = ulen;
3343 for (i = 0; i < prog->aux->func_cnt; i++) {
3344 len = prog->aux->func[i]->jited_len;
3345 len = min_t(u32, len, free);
3346 img = (u8 *) prog->aux->func[i]->bpf_func;
3347 if (copy_to_user(uinsns, img, len))
3348 return -EFAULT;
3349 uinsns += len;
3350 free -= len;
3351 if (!free)
3352 break;
3353 }
3354 } else {
3355 if (copy_to_user(uinsns, prog->bpf_func, ulen))
3356 return -EFAULT;
3357 }
3358 } else {
3359 info.jited_prog_insns = 0;
3360 }
3361 }
3362
3363 ulen = info.nr_jited_ksyms;
3364 info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
3365 if (ulen) {
3366 if (bpf_dump_raw_ok(file->f_cred)) {
3367 unsigned long ksym_addr;
3368 u64 __user *user_ksyms;
3369 u32 i;
3370
3371 /* copy the address of the kernel symbol
3372 * corresponding to each function
3373 */
3374 ulen = min_t(u32, info.nr_jited_ksyms, ulen);
3375 user_ksyms = u64_to_user_ptr(info.jited_ksyms);
3376 if (prog->aux->func_cnt) {
3377 for (i = 0; i < ulen; i++) {
3378 ksym_addr = (unsigned long)
3379 prog->aux->func[i]->bpf_func;
3380 if (put_user((u64) ksym_addr,
3381 &user_ksyms[i]))
3382 return -EFAULT;
3383 }
3384 } else {
3385 ksym_addr = (unsigned long) prog->bpf_func;
3386 if (put_user((u64) ksym_addr, &user_ksyms[0]))
3387 return -EFAULT;
3388 }
3389 } else {
3390 info.jited_ksyms = 0;
3391 }
3392 }
3393
3394 ulen = info.nr_jited_func_lens;
3395 info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
3396 if (ulen) {
3397 if (bpf_dump_raw_ok(file->f_cred)) {
3398 u32 __user *user_lens;
3399 u32 func_len, i;
3400
3401 /* copy the JITed image lengths for each function */
3402 ulen = min_t(u32, info.nr_jited_func_lens, ulen);
3403 user_lens = u64_to_user_ptr(info.jited_func_lens);
3404 if (prog->aux->func_cnt) {
3405 for (i = 0; i < ulen; i++) {
3406 func_len =
3407 prog->aux->func[i]->jited_len;
3408 if (put_user(func_len, &user_lens[i]))
3409 return -EFAULT;
3410 }
3411 } else {
3412 func_len = prog->jited_len;
3413 if (put_user(func_len, &user_lens[0]))
3414 return -EFAULT;
3415 }
3416 } else {
3417 info.jited_func_lens = 0;
3418 }
3419 }
3420
3421 if (prog->aux->btf)
3422 info.btf_id = btf_id(prog->aux->btf);
3423
3424 ulen = info.nr_func_info;
3425 info.nr_func_info = prog->aux->func_info_cnt;
3426 if (info.nr_func_info && ulen) {
3427 char __user *user_finfo;
3428
3429 user_finfo = u64_to_user_ptr(info.func_info);
3430 ulen = min_t(u32, info.nr_func_info, ulen);
3431 if (copy_to_user(user_finfo, prog->aux->func_info,
3432 info.func_info_rec_size * ulen))
3433 return -EFAULT;
3434 }
3435
3436 ulen = info.nr_line_info;
3437 info.nr_line_info = prog->aux->nr_linfo;
3438 if (info.nr_line_info && ulen) {
3439 __u8 __user *user_linfo;
3440
3441 user_linfo = u64_to_user_ptr(info.line_info);
3442 ulen = min_t(u32, info.nr_line_info, ulen);
3443 if (copy_to_user(user_linfo, prog->aux->linfo,
3444 info.line_info_rec_size * ulen))
3445 return -EFAULT;
3446 }
3447
3448 ulen = info.nr_jited_line_info;
3449 if (prog->aux->jited_linfo)
3450 info.nr_jited_line_info = prog->aux->nr_linfo;
3451 else
3452 info.nr_jited_line_info = 0;
3453 if (info.nr_jited_line_info && ulen) {
3454 if (bpf_dump_raw_ok(file->f_cred)) {
3455 __u64 __user *user_linfo;
3456 u32 i;
3457
3458 user_linfo = u64_to_user_ptr(info.jited_line_info);
3459 ulen = min_t(u32, info.nr_jited_line_info, ulen);
3460 for (i = 0; i < ulen; i++) {
3461 if (put_user((__u64)(long)prog->aux->jited_linfo[i],
3462 &user_linfo[i]))
3463 return -EFAULT;
3464 }
3465 } else {
3466 info.jited_line_info = 0;
3467 }
3468 }
3469
3470 ulen = info.nr_prog_tags;
3471 info.nr_prog_tags = prog->aux->func_cnt ? : 1;
3472 if (ulen) {
3473 __u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
3474 u32 i;
3475
3476 user_prog_tags = u64_to_user_ptr(info.prog_tags);
3477 ulen = min_t(u32, info.nr_prog_tags, ulen);
3478 if (prog->aux->func_cnt) {
3479 for (i = 0; i < ulen; i++) {
3480 if (copy_to_user(user_prog_tags[i],
3481 prog->aux->func[i]->tag,
3482 BPF_TAG_SIZE))
3483 return -EFAULT;
3484 }
3485 } else {
3486 if (copy_to_user(user_prog_tags[0],
3487 prog->tag, BPF_TAG_SIZE))
3488 return -EFAULT;
3489 }
3490 }
3491
3492 done:
3493 if (copy_to_user(uinfo, &info, info_len) ||
3494 put_user(info_len, &uattr->info.info_len))
3495 return -EFAULT;
3496
3497 return 0;
3498 }
3499
3500 static int bpf_map_get_info_by_fd(struct file *file,
3501 struct bpf_map *map,
3502 const union bpf_attr *attr,
3503 union bpf_attr __user *uattr)
3504 {
3505 struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3506 struct bpf_map_info info;
3507 u32 info_len = attr->info.info_len;
3508 int err;
3509
3510 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
3511 if (err)
3512 return err;
3513 info_len = min_t(u32, sizeof(info), info_len);
3514
3515 memset(&info, 0, sizeof(info));
3516 info.type = map->map_type;
3517 info.id = map->id;
3518 info.key_size = map->key_size;
3519 info.value_size = map->value_size;
3520 info.max_entries = map->max_entries;
3521 info.map_flags = map->map_flags;
3522 memcpy(info.name, map->name, sizeof(map->name));
3523
3524 if (map->btf) {
3525 info.btf_id = btf_id(map->btf);
3526 info.btf_key_type_id = map->btf_key_type_id;
3527 info.btf_value_type_id = map->btf_value_type_id;
3528 }
3529 info.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id;
3530
3531 if (bpf_map_is_dev_bound(map)) {
3532 err = bpf_map_offload_info_fill(&info, map);
3533 if (err)
3534 return err;
3535 }
3536
3537 if (copy_to_user(uinfo, &info, info_len) ||
3538 put_user(info_len, &uattr->info.info_len))
3539 return -EFAULT;
3540
3541 return 0;
3542 }
3543
3544 static int bpf_btf_get_info_by_fd(struct file *file,
3545 struct btf *btf,
3546 const union bpf_attr *attr,
3547 union bpf_attr __user *uattr)
3548 {
3549 struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3550 u32 info_len = attr->info.info_len;
3551 int err;
3552
3553 err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len);
3554 if (err)
3555 return err;
3556
3557 return btf_get_info_by_fd(btf, attr, uattr);
3558 }
3559
3560 static int bpf_link_get_info_by_fd(struct file *file,
3561 struct bpf_link *link,
3562 const union bpf_attr *attr,
3563 union bpf_attr __user *uattr)
3564 {
3565 struct bpf_link_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3566 struct bpf_link_info info;
3567 u32 info_len = attr->info.info_len;
3568 int err;
3569
3570 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
3571 if (err)
3572 return err;
3573 info_len = min_t(u32, sizeof(info), info_len);
3574
3575 memset(&info, 0, sizeof(info));
3576 if (copy_from_user(&info, uinfo, info_len))
3577 return -EFAULT;
3578
3579 info.type = link->type;
3580 info.id = link->id;
3581 info.prog_id = link->prog->aux->id;
3582
3583 if (link->ops->fill_link_info) {
3584 err = link->ops->fill_link_info(link, &info);
3585 if (err)
3586 return err;
3587 }
3588
3589 if (copy_to_user(uinfo, &info, info_len) ||
3590 put_user(info_len, &uattr->info.info_len))
3591 return -EFAULT;
3592
3593 return 0;
3594 }
3595
3596
3597 #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
3598
3599 static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
3600 union bpf_attr __user *uattr)
3601 {
3602 int ufd = attr->info.bpf_fd;
3603 struct fd f;
3604 int err;
3605
3606 if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
3607 return -EINVAL;
3608
3609 f = fdget(ufd);
3610 if (!f.file)
3611 return -EBADFD;
3612
3613 if (f.file->f_op == &bpf_prog_fops)
3614 err = bpf_prog_get_info_by_fd(f.file, f.file->private_data, attr,
3615 uattr);
3616 else if (f.file->f_op == &bpf_map_fops)
3617 err = bpf_map_get_info_by_fd(f.file, f.file->private_data, attr,
3618 uattr);
3619 else if (f.file->f_op == &btf_fops)
3620 err = bpf_btf_get_info_by_fd(f.file, f.file->private_data, attr, uattr);
3621 else if (f.file->f_op == &bpf_link_fops)
3622 err = bpf_link_get_info_by_fd(f.file, f.file->private_data,
3623 attr, uattr);
3624 else
3625 err = -EINVAL;
3626
3627 fdput(f);
3628 return err;
3629 }
3630
3631 #define BPF_BTF_LOAD_LAST_FIELD btf_log_level
3632
3633 static int bpf_btf_load(const union bpf_attr *attr)
3634 {
3635 if (CHECK_ATTR(BPF_BTF_LOAD))
3636 return -EINVAL;
3637
3638 if (!bpf_capable())
3639 return -EPERM;
3640
3641 return btf_new_fd(attr);
3642 }
3643
3644 #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
3645
3646 static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
3647 {
3648 if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
3649 return -EINVAL;
3650
3651 if (!capable(CAP_SYS_ADMIN))
3652 return -EPERM;
3653
3654 return btf_get_fd_by_id(attr->btf_id);
3655 }
3656
3657 static int bpf_task_fd_query_copy(const union bpf_attr *attr,
3658 union bpf_attr __user *uattr,
3659 u32 prog_id, u32 fd_type,
3660 const char *buf, u64 probe_offset,
3661 u64 probe_addr)
3662 {
3663 char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
3664 u32 len = buf ? strlen(buf) : 0, input_len;
3665 int err = 0;
3666
3667 if (put_user(len, &uattr->task_fd_query.buf_len))
3668 return -EFAULT;
3669 input_len = attr->task_fd_query.buf_len;
3670 if (input_len && ubuf) {
3671 if (!len) {
3672 /* nothing to copy, just make ubuf NULL terminated */
3673 char zero = '\0';
3674
3675 if (put_user(zero, ubuf))
3676 return -EFAULT;
3677 } else if (input_len >= len + 1) {
3678 /* ubuf can hold the string with NULL terminator */
3679 if (copy_to_user(ubuf, buf, len + 1))
3680 return -EFAULT;
3681 } else {
3682 /* ubuf cannot hold the string with NULL terminator,
3683 * do a partial copy with NULL terminator.
3684 */
3685 char zero = '\0';
3686
3687 err = -ENOSPC;
3688 if (copy_to_user(ubuf, buf, input_len - 1))
3689 return -EFAULT;
3690 if (put_user(zero, ubuf + input_len - 1))
3691 return -EFAULT;
3692 }
3693 }
3694
3695 if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
3696 put_user(fd_type, &uattr->task_fd_query.fd_type) ||
3697 put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
3698 put_user(probe_addr, &uattr->task_fd_query.probe_addr))
3699 return -EFAULT;
3700
3701 return err;
3702 }
3703
3704 #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
3705
3706 static int bpf_task_fd_query(const union bpf_attr *attr,
3707 union bpf_attr __user *uattr)
3708 {
3709 pid_t pid = attr->task_fd_query.pid;
3710 u32 fd = attr->task_fd_query.fd;
3711 const struct perf_event *event;
3712 struct files_struct *files;
3713 struct task_struct *task;
3714 struct file *file;
3715 int err;
3716
3717 if (CHECK_ATTR(BPF_TASK_FD_QUERY))
3718 return -EINVAL;
3719
3720 if (!capable(CAP_SYS_ADMIN))
3721 return -EPERM;
3722
3723 if (attr->task_fd_query.flags != 0)
3724 return -EINVAL;
3725
3726 task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
3727 if (!task)
3728 return -ENOENT;
3729
3730 files = get_files_struct(task);
3731 put_task_struct(task);
3732 if (!files)
3733 return -ENOENT;
3734
3735 err = 0;
3736 spin_lock(&files->file_lock);
3737 file = fcheck_files(files, fd);
3738 if (!file)
3739 err = -EBADF;
3740 else
3741 get_file(file);
3742 spin_unlock(&files->file_lock);
3743 put_files_struct(files);
3744
3745 if (err)
3746 goto out;
3747
3748 if (file->f_op == &bpf_link_fops) {
3749 struct bpf_link *link = file->private_data;
3750
3751 if (link->ops == &bpf_raw_tp_link_lops) {
3752 struct bpf_raw_tp_link *raw_tp =
3753 container_of(link, struct bpf_raw_tp_link, link);
3754 struct bpf_raw_event_map *btp = raw_tp->btp;
3755
3756 err = bpf_task_fd_query_copy(attr, uattr,
3757 raw_tp->link.prog->aux->id,
3758 BPF_FD_TYPE_RAW_TRACEPOINT,
3759 btp->tp->name, 0, 0);
3760 goto put_file;
3761 }
3762 goto out_not_supp;
3763 }
3764
3765 event = perf_get_event(file);
3766 if (!IS_ERR(event)) {
3767 u64 probe_offset, probe_addr;
3768 u32 prog_id, fd_type;
3769 const char *buf;
3770
3771 err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
3772 &buf, &probe_offset,
3773 &probe_addr);
3774 if (!err)
3775 err = bpf_task_fd_query_copy(attr, uattr, prog_id,
3776 fd_type, buf,
3777 probe_offset,
3778 probe_addr);
3779 goto put_file;
3780 }
3781
3782 out_not_supp:
3783 err = -ENOTSUPP;
3784 put_file:
3785 fput(file);
3786 out:
3787 return err;
3788 }
3789
3790 #define BPF_MAP_BATCH_LAST_FIELD batch.flags
3791
3792 #define BPF_DO_BATCH(fn) \
3793 do { \
3794 if (!fn) { \
3795 err = -ENOTSUPP; \
3796 goto err_put; \
3797 } \
3798 err = fn(map, attr, uattr); \
3799 } while (0)
3800
3801 static int bpf_map_do_batch(const union bpf_attr *attr,
3802 union bpf_attr __user *uattr,
3803 int cmd)
3804 {
3805 struct bpf_map *map;
3806 int err, ufd;
3807 struct fd f;
3808
3809 if (CHECK_ATTR(BPF_MAP_BATCH))
3810 return -EINVAL;
3811
3812 ufd = attr->batch.map_fd;
3813 f = fdget(ufd);
3814 map = __bpf_map_get(f);
3815 if (IS_ERR(map))
3816 return PTR_ERR(map);
3817
3818 if ((cmd == BPF_MAP_LOOKUP_BATCH ||
3819 cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH) &&
3820 !(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
3821 err = -EPERM;
3822 goto err_put;
3823 }
3824
3825 if (cmd != BPF_MAP_LOOKUP_BATCH &&
3826 !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
3827 err = -EPERM;
3828 goto err_put;
3829 }
3830
3831 if (cmd == BPF_MAP_LOOKUP_BATCH)
3832 BPF_DO_BATCH(map->ops->map_lookup_batch);
3833 else if (cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH)
3834 BPF_DO_BATCH(map->ops->map_lookup_and_delete_batch);
3835 else if (cmd == BPF_MAP_UPDATE_BATCH)
3836 BPF_DO_BATCH(map->ops->map_update_batch);
3837 else
3838 BPF_DO_BATCH(map->ops->map_delete_batch);
3839
3840 err_put:
3841 fdput(f);
3842 return err;
3843 }
3844
3845 static int tracing_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
3846 {
3847 if (attr->link_create.attach_type == BPF_TRACE_ITER &&
3848 prog->expected_attach_type == BPF_TRACE_ITER)
3849 return bpf_iter_link_attach(attr, prog);
3850
3851 return -EINVAL;
3852 }
3853
3854 #define BPF_LINK_CREATE_LAST_FIELD link_create.flags
3855 static int link_create(union bpf_attr *attr)
3856 {
3857 enum bpf_prog_type ptype;
3858 struct bpf_prog *prog;
3859 int ret;
3860
3861 if (CHECK_ATTR(BPF_LINK_CREATE))
3862 return -EINVAL;
3863
3864 ptype = attach_type_to_prog_type(attr->link_create.attach_type);
3865 if (ptype == BPF_PROG_TYPE_UNSPEC)
3866 return -EINVAL;
3867
3868 prog = bpf_prog_get_type(attr->link_create.prog_fd, ptype);
3869 if (IS_ERR(prog))
3870 return PTR_ERR(prog);
3871
3872 ret = bpf_prog_attach_check_attach_type(prog,
3873 attr->link_create.attach_type);
3874 if (ret)
3875 goto err_out;
3876
3877 switch (ptype) {
3878 case BPF_PROG_TYPE_CGROUP_SKB:
3879 case BPF_PROG_TYPE_CGROUP_SOCK:
3880 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
3881 case BPF_PROG_TYPE_SOCK_OPS:
3882 case BPF_PROG_TYPE_CGROUP_DEVICE:
3883 case BPF_PROG_TYPE_CGROUP_SYSCTL:
3884 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
3885 ret = cgroup_bpf_link_attach(attr, prog);
3886 break;
3887 case BPF_PROG_TYPE_TRACING:
3888 ret = tracing_bpf_link_attach(attr, prog);
3889 break;
3890 case BPF_PROG_TYPE_FLOW_DISSECTOR:
3891 ret = netns_bpf_link_create(attr, prog);
3892 break;
3893 default:
3894 ret = -EINVAL;
3895 }
3896
3897 err_out:
3898 if (ret < 0)
3899 bpf_prog_put(prog);
3900 return ret;
3901 }
3902
3903 #define BPF_LINK_UPDATE_LAST_FIELD link_update.old_prog_fd
3904
3905 static int link_update(union bpf_attr *attr)
3906 {
3907 struct bpf_prog *old_prog = NULL, *new_prog;
3908 struct bpf_link *link;
3909 u32 flags;
3910 int ret;
3911
3912 if (CHECK_ATTR(BPF_LINK_UPDATE))
3913 return -EINVAL;
3914
3915 flags = attr->link_update.flags;
3916 if (flags & ~BPF_F_REPLACE)
3917 return -EINVAL;
3918
3919 link = bpf_link_get_from_fd(attr->link_update.link_fd);
3920 if (IS_ERR(link))
3921 return PTR_ERR(link);
3922
3923 new_prog = bpf_prog_get(attr->link_update.new_prog_fd);
3924 if (IS_ERR(new_prog)) {
3925 ret = PTR_ERR(new_prog);
3926 goto out_put_link;
3927 }
3928
3929 if (flags & BPF_F_REPLACE) {
3930 old_prog = bpf_prog_get(attr->link_update.old_prog_fd);
3931 if (IS_ERR(old_prog)) {
3932 ret = PTR_ERR(old_prog);
3933 old_prog = NULL;
3934 goto out_put_progs;
3935 }
3936 } else if (attr->link_update.old_prog_fd) {
3937 ret = -EINVAL;
3938 goto out_put_progs;
3939 }
3940
3941 if (link->ops->update_prog)
3942 ret = link->ops->update_prog(link, new_prog, old_prog);
3943 else
3944 ret = -EINVAL;
3945
3946 out_put_progs:
3947 if (old_prog)
3948 bpf_prog_put(old_prog);
3949 if (ret)
3950 bpf_prog_put(new_prog);
3951 out_put_link:
3952 bpf_link_put(link);
3953 return ret;
3954 }
3955
3956 static int bpf_link_inc_not_zero(struct bpf_link *link)
3957 {
3958 return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? 0 : -ENOENT;
3959 }
3960
3961 #define BPF_LINK_GET_FD_BY_ID_LAST_FIELD link_id
3962
3963 static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
3964 {
3965 struct bpf_link *link;
3966 u32 id = attr->link_id;
3967 int fd, err;
3968
3969 if (CHECK_ATTR(BPF_LINK_GET_FD_BY_ID))
3970 return -EINVAL;
3971
3972 if (!capable(CAP_SYS_ADMIN))
3973 return -EPERM;
3974
3975 spin_lock_bh(&link_idr_lock);
3976 link = idr_find(&link_idr, id);
3977 /* before link is "settled", ID is 0, pretend it doesn't exist yet */
3978 if (link) {
3979 if (link->id)
3980 err = bpf_link_inc_not_zero(link);
3981 else
3982 err = -EAGAIN;
3983 } else {
3984 err = -ENOENT;
3985 }
3986 spin_unlock_bh(&link_idr_lock);
3987
3988 if (err)
3989 return err;
3990
3991 fd = bpf_link_new_fd(link);
3992 if (fd < 0)
3993 bpf_link_put(link);
3994
3995 return fd;
3996 }
3997
3998 DEFINE_MUTEX(bpf_stats_enabled_mutex);
3999
4000 static int bpf_stats_release(struct inode *inode, struct file *file)
4001 {
4002 mutex_lock(&bpf_stats_enabled_mutex);
4003 static_key_slow_dec(&bpf_stats_enabled_key.key);
4004 mutex_unlock(&bpf_stats_enabled_mutex);
4005 return 0;
4006 }
4007
4008 static const struct file_operations bpf_stats_fops = {
4009 .release = bpf_stats_release,
4010 };
4011
4012 static int bpf_enable_runtime_stats(void)
4013 {
4014 int fd;
4015
4016 mutex_lock(&bpf_stats_enabled_mutex);
4017
4018 /* Set a very high limit to avoid overflow */
4019 if (static_key_count(&bpf_stats_enabled_key.key) > INT_MAX / 2) {
4020 mutex_unlock(&bpf_stats_enabled_mutex);
4021 return -EBUSY;
4022 }
4023
4024 fd = anon_inode_getfd("bpf-stats", &bpf_stats_fops, NULL, O_CLOEXEC);
4025 if (fd >= 0)
4026 static_key_slow_inc(&bpf_stats_enabled_key.key);
4027
4028 mutex_unlock(&bpf_stats_enabled_mutex);
4029 return fd;
4030 }
4031
4032 #define BPF_ENABLE_STATS_LAST_FIELD enable_stats.type
4033
4034 static int bpf_enable_stats(union bpf_attr *attr)
4035 {
4036
4037 if (CHECK_ATTR(BPF_ENABLE_STATS))
4038 return -EINVAL;
4039
4040 if (!capable(CAP_SYS_ADMIN))
4041 return -EPERM;
4042
4043 switch (attr->enable_stats.type) {
4044 case BPF_STATS_RUN_TIME:
4045 return bpf_enable_runtime_stats();
4046 default:
4047 break;
4048 }
4049 return -EINVAL;
4050 }
4051
4052 #define BPF_ITER_CREATE_LAST_FIELD iter_create.flags
4053
4054 static int bpf_iter_create(union bpf_attr *attr)
4055 {
4056 struct bpf_link *link;
4057 int err;
4058
4059 if (CHECK_ATTR(BPF_ITER_CREATE))
4060 return -EINVAL;
4061
4062 if (attr->iter_create.flags)
4063 return -EINVAL;
4064
4065 link = bpf_link_get_from_fd(attr->iter_create.link_fd);
4066 if (IS_ERR(link))
4067 return PTR_ERR(link);
4068
4069 err = bpf_iter_new_fd(link);
4070 bpf_link_put(link);
4071
4072 return err;
4073 }
4074
4075 SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
4076 {
4077 union bpf_attr attr;
4078 int err;
4079
4080 if (sysctl_unprivileged_bpf_disabled && !bpf_capable())
4081 return -EPERM;
4082
4083 err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
4084 if (err)
4085 return err;
4086 size = min_t(u32, size, sizeof(attr));
4087
4088 /* copy attributes from user space, may be less than sizeof(bpf_attr) */
4089 memset(&attr, 0, sizeof(attr));
4090 if (copy_from_user(&attr, uattr, size) != 0)
4091 return -EFAULT;
4092
4093 err = security_bpf(cmd, &attr, size);
4094 if (err < 0)
4095 return err;
4096
4097 switch (cmd) {
4098 case BPF_MAP_CREATE:
4099 err = map_create(&attr);
4100 break;
4101 case BPF_MAP_LOOKUP_ELEM:
4102 err = map_lookup_elem(&attr);
4103 break;
4104 case BPF_MAP_UPDATE_ELEM:
4105 err = map_update_elem(&attr);
4106 break;
4107 case BPF_MAP_DELETE_ELEM:
4108 err = map_delete_elem(&attr);
4109 break;
4110 case BPF_MAP_GET_NEXT_KEY:
4111 err = map_get_next_key(&attr);
4112 break;
4113 case BPF_MAP_FREEZE:
4114 err = map_freeze(&attr);
4115 break;
4116 case BPF_PROG_LOAD:
4117 err = bpf_prog_load(&attr, uattr);
4118 break;
4119 case BPF_OBJ_PIN:
4120 err = bpf_obj_pin(&attr);
4121 break;
4122 case BPF_OBJ_GET:
4123 err = bpf_obj_get(&attr);
4124 break;
4125 case BPF_PROG_ATTACH:
4126 err = bpf_prog_attach(&attr);
4127 break;
4128 case BPF_PROG_DETACH:
4129 err = bpf_prog_detach(&attr);
4130 break;
4131 case BPF_PROG_QUERY:
4132 err = bpf_prog_query(&attr, uattr);
4133 break;
4134 case BPF_PROG_TEST_RUN:
4135 err = bpf_prog_test_run(&attr, uattr);
4136 break;
4137 case BPF_PROG_GET_NEXT_ID:
4138 err = bpf_obj_get_next_id(&attr, uattr,
4139 &prog_idr, &prog_idr_lock);
4140 break;
4141 case BPF_MAP_GET_NEXT_ID:
4142 err = bpf_obj_get_next_id(&attr, uattr,
4143 &map_idr, &map_idr_lock);
4144 break;
4145 case BPF_BTF_GET_NEXT_ID:
4146 err = bpf_obj_get_next_id(&attr, uattr,
4147 &btf_idr, &btf_idr_lock);
4148 break;
4149 case BPF_PROG_GET_FD_BY_ID:
4150 err = bpf_prog_get_fd_by_id(&attr);
4151 break;
4152 case BPF_MAP_GET_FD_BY_ID:
4153 err = bpf_map_get_fd_by_id(&attr);
4154 break;
4155 case BPF_OBJ_GET_INFO_BY_FD:
4156 err = bpf_obj_get_info_by_fd(&attr, uattr);
4157 break;
4158 case BPF_RAW_TRACEPOINT_OPEN:
4159 err = bpf_raw_tracepoint_open(&attr);
4160 break;
4161 case BPF_BTF_LOAD:
4162 err = bpf_btf_load(&attr);
4163 break;
4164 case BPF_BTF_GET_FD_BY_ID:
4165 err = bpf_btf_get_fd_by_id(&attr);
4166 break;
4167 case BPF_TASK_FD_QUERY:
4168 err = bpf_task_fd_query(&attr, uattr);
4169 break;
4170 case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
4171 err = map_lookup_and_delete_elem(&attr);
4172 break;
4173 case BPF_MAP_LOOKUP_BATCH:
4174 err = bpf_map_do_batch(&attr, uattr, BPF_MAP_LOOKUP_BATCH);
4175 break;
4176 case BPF_MAP_LOOKUP_AND_DELETE_BATCH:
4177 err = bpf_map_do_batch(&attr, uattr,
4178 BPF_MAP_LOOKUP_AND_DELETE_BATCH);
4179 break;
4180 case BPF_MAP_UPDATE_BATCH:
4181 err = bpf_map_do_batch(&attr, uattr, BPF_MAP_UPDATE_BATCH);
4182 break;
4183 case BPF_MAP_DELETE_BATCH:
4184 err = bpf_map_do_batch(&attr, uattr, BPF_MAP_DELETE_BATCH);
4185 break;
4186 case BPF_LINK_CREATE:
4187 err = link_create(&attr);
4188 break;
4189 case BPF_LINK_UPDATE:
4190 err = link_update(&attr);
4191 break;
4192 case BPF_LINK_GET_FD_BY_ID:
4193 err = bpf_link_get_fd_by_id(&attr);
4194 break;
4195 case BPF_LINK_GET_NEXT_ID:
4196 err = bpf_obj_get_next_id(&attr, uattr,
4197 &link_idr, &link_idr_lock);
4198 break;
4199 case BPF_ENABLE_STATS:
4200 err = bpf_enable_stats(&attr);
4201 break;
4202 case BPF_ITER_CREATE:
4203 err = bpf_iter_create(&attr);
4204 break;
4205 default:
4206 err = -EINVAL;
4207 break;
4208 }
4209
4210 return err;
4211 }
Linux with added FPC-III support