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