kernel/bpf/syscall.c

   1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of version 2 of the GNU General Public
   5  * License as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful, but
   8  * WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10  * General Public License for more details.
  11  */
  12 #include <linux/bpf.h>
  13 #include <linux/bpf_trace.h>
  14 #include <linux/bpf_lirc.h>
  15 #include <linux/btf.h>
  16 #include <linux/syscalls.h>
  17 #include <linux/slab.h>
  18 #include <linux/sched/signal.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/mmzone.h>
  21 #include <linux/anon_inodes.h>
  22 #include <linux/fdtable.h>
  23 #include <linux/file.h>
  24 #include <linux/fs.h>
  25 #include <linux/license.h>
  26 #include <linux/filter.h>
  27 #include <linux/version.h>
  28 #include <linux/kernel.h>
  29 #include <linux/idr.h>
  30 #include <linux/cred.h>
  31 #include <linux/timekeeping.h>
  32 #include <linux/ctype.h>
  33 #include <linux/nospec.h>
  34
  35 #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \
  36                            (map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
  37                            (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
  38                            (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
  39 #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
  40 #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map))
  41
  42 #define BPF_OBJ_FLAG_MASK   (BPF_F_RDONLY | BPF_F_WRONLY)
  43
  44 DEFINE_PER_CPU(int, bpf_prog_active);
  45 static DEFINE_IDR(prog_idr);
  46 static DEFINE_SPINLOCK(prog_idr_lock);
  47 static DEFINE_IDR(map_idr);
  48 static DEFINE_SPINLOCK(map_idr_lock);
  49
  50 int sysctl_unprivileged_bpf_disabled __read_mostly;
  51
  52 static const struct bpf_map_ops * const bpf_map_types[] = {
  53 #define BPF_PROG_TYPE(_id, _ops)
  54 #define BPF_MAP_TYPE(_id, _ops) \
  55         [_id] = &_ops,
  56 #include <linux/bpf_types.h>
  57 #undef BPF_PROG_TYPE
  58 #undef BPF_MAP_TYPE
  59 };
  60
  61 /*
  62  * If we're handed a bigger struct than we know of, ensure all the unknown bits
  63  * are 0 - i.e. new user-space does not rely on any kernel feature extensions
  64  * we don't know about yet.
  65  *
  66  * There is a ToCToU between this function call and the following
  67  * copy_from_user() call. However, this is not a concern since this function is
  68  * meant to be a future-proofing of bits.
  69  */
  70 int bpf_check_uarg_tail_zero(void __user *uaddr,
  71                              size_t expected_size,
  72                              size_t actual_size)
  73 {
  74         unsigned char __user *addr;
  75         unsigned char __user *end;
  76         unsigned char val;
  77         int err;
  78
  79         if (unlikely(actual_size > PAGE_SIZE))  /* silly large */
  80                 return -E2BIG;
  81
  82         if (unlikely(!access_ok(uaddr, actual_size)))
  83                 return -EFAULT;
  84
  85         if (actual_size <= expected_size)
  86                 return 0;
  87
  88         addr = uaddr + expected_size;
  89         end  = uaddr + actual_size;
  90
  91         for (; addr < end; addr++) {
  92                 err = get_user(val, addr);
  93                 if (err)
  94                         return err;
  95                 if (val)
  96                         return -E2BIG;
  97         }
  98
  99         return 0;
 100 }
 101
 102 const struct bpf_map_ops bpf_map_offload_ops = {
 103         .map_alloc = bpf_map_offload_map_alloc,
 104         .map_free = bpf_map_offload_map_free,
 105         .map_check_btf = map_check_no_btf,
 106 };
 107
 108 static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
 109 {
 110         const struct bpf_map_ops *ops;
 111         u32 type = attr->map_type;
 112         struct bpf_map *map;
 113         int err;
 114
 115         if (type >= ARRAY_SIZE(bpf_map_types))
 116                 return ERR_PTR(-EINVAL);
 117         type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types));
 118         ops = bpf_map_types[type];
 119         if (!ops)
 120                 return ERR_PTR(-EINVAL);
 121
 122         if (ops->map_alloc_check) {
 123                 err = ops->map_alloc_check(attr);
 124                 if (err)
 125                         return ERR_PTR(err);
 126         }
 127         if (attr->map_ifindex)
 128                 ops = &bpf_map_offload_ops;
 129         map = ops->map_alloc(attr);
 130         if (IS_ERR(map))
 131                 return map;
 132         map->ops = ops;
 133         map->map_type = type;
 134         return map;
 135 }
 136
 137 void *bpf_map_area_alloc(size_t size, int numa_node)
 138 {
 139         /* We really just want to fail instead of triggering OOM killer
 140          * under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
 141          * which is used for lower order allocation requests.
 142          *
 143          * It has been observed that higher order allocation requests done by
 144          * vmalloc with __GFP_NORETRY being set might fail due to not trying
 145          * to reclaim memory from the page cache, thus we set
 146          * __GFP_RETRY_MAYFAIL to avoid such situations.
 147          */
 148
 149         const gfp_t flags = __GFP_NOWARN | __GFP_ZERO;
 150         void *area;
 151
 152         if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
 153                 area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags,
 154                                     numa_node);
 155                 if (area != NULL)
 156                         return area;
 157         }
 158
 159         return __vmalloc_node_flags_caller(size, numa_node,
 160                                            GFP_KERNEL | __GFP_RETRY_MAYFAIL |
 161                                            flags, __builtin_return_address(0));
 162 }
 163
 164 void bpf_map_area_free(void *area)
 165 {
 166         kvfree(area);
 167 }
 168
 169 static u32 bpf_map_flags_retain_permanent(u32 flags)
 170 {
 171         /* Some map creation flags are not tied to the map object but
 172          * rather to the map fd instead, so they have no meaning upon
 173          * map object inspection since multiple file descriptors with
 174          * different (access) properties can exist here. Thus, given
 175          * this has zero meaning for the map itself, lets clear these
 176          * from here.
 177          */
 178         return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY);
 179 }
 180
 181 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
 182 {
 183         map->map_type = attr->map_type;
 184         map->key_size = attr->key_size;
 185         map->value_size = attr->value_size;
 186         map->max_entries = attr->max_entries;
 187         map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags);
 188         map->numa_node = bpf_map_attr_numa_node(attr);
 189 }
 190
 191 int bpf_map_precharge_memlock(u32 pages)
 192 {
 193         struct user_struct *user = get_current_user();
 194         unsigned long memlock_limit, cur;
 195
 196         memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 197         cur = atomic_long_read(&user->locked_vm);
 198         free_uid(user);
 199         if (cur + pages > memlock_limit)
 200                 return -EPERM;
 201         return 0;
 202 }
 203
 204 static int bpf_charge_memlock(struct user_struct *user, u32 pages)
 205 {
 206         unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 207
 208         if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) {
 209                 atomic_long_sub(pages, &user->locked_vm);
 210                 return -EPERM;
 211         }
 212         return 0;
 213 }
 214
 215 static void bpf_uncharge_memlock(struct user_struct *user, u32 pages)
 216 {
 217         atomic_long_sub(pages, &user->locked_vm);
 218 }
 219
 220 static int bpf_map_init_memlock(struct bpf_map *map)
 221 {
 222         struct user_struct *user = get_current_user();
 223         int ret;
 224
 225         ret = bpf_charge_memlock(user, map->pages);
 226         if (ret) {
 227                 free_uid(user);
 228                 return ret;
 229         }
 230         map->user = user;
 231         return ret;
 232 }
 233
 234 static void bpf_map_release_memlock(struct bpf_map *map)
 235 {
 236         struct user_struct *user = map->user;
 237         bpf_uncharge_memlock(user, map->pages);
 238         free_uid(user);
 239 }
 240
 241 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages)
 242 {
 243         int ret;
 244
 245         ret = bpf_charge_memlock(map->user, pages);
 246         if (ret)
 247                 return ret;
 248         map->pages += pages;
 249         return ret;
 250 }
 251
 252 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages)
 253 {
 254         bpf_uncharge_memlock(map->user, pages);
 255         map->pages -= pages;
 256 }
 257
 258 static int bpf_map_alloc_id(struct bpf_map *map)
 259 {
 260         int id;
 261
 262         idr_preload(GFP_KERNEL);
 263         spin_lock_bh(&map_idr_lock);
 264         id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
 265         if (id > 0)
 266                 map->id = id;
 267         spin_unlock_bh(&map_idr_lock);
 268         idr_preload_end();
 269
 270         if (WARN_ON_ONCE(!id))
 271                 return -ENOSPC;
 272
 273         return id > 0 ? 0 : id;
 274 }
 275
 276 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
 277 {
 278         unsigned long flags;
 279
 280         /* Offloaded maps are removed from the IDR store when their device
 281          * disappears - even if someone holds an fd to them they are unusable,
 282          * the memory is gone, all ops will fail; they are simply waiting for
 283          * refcnt to drop to be freed.
 284          */
 285         if (!map->id)
 286                 return;
 287
 288         if (do_idr_lock)
 289                 spin_lock_irqsave(&map_idr_lock, flags);
 290         else
 291                 __acquire(&map_idr_lock);
 292
 293         idr_remove(&map_idr, map->id);
 294         map->id = 0;
 295
 296         if (do_idr_lock)
 297                 spin_unlock_irqrestore(&map_idr_lock, flags);
 298         else
 299                 __release(&map_idr_lock);
 300 }
 301
 302 /* called from workqueue */
 303 static void bpf_map_free_deferred(struct work_struct *work)
 304 {
 305         struct bpf_map *map = container_of(work, struct bpf_map, work);
 306
 307         bpf_map_release_memlock(map);
 308         security_bpf_map_free(map);
 309         /* implementation dependent freeing */
 310         map->ops->map_free(map);
 311 }
 312
 313 static void bpf_map_put_uref(struct bpf_map *map)
 314 {
 315         if (atomic_dec_and_test(&map->usercnt)) {
 316                 if (map->ops->map_release_uref)
 317                         map->ops->map_release_uref(map);
 318         }
 319 }
 320
 321 /* decrement map refcnt and schedule it for freeing via workqueue
 322  * (unrelying map implementation ops->map_free() might sleep)
 323  */
 324 static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
 325 {
 326         if (atomic_dec_and_test(&map->refcnt)) {
 327                 /* bpf_map_free_id() must be called first */
 328                 bpf_map_free_id(map, do_idr_lock);
 329                 btf_put(map->btf);
 330                 INIT_WORK(&map->work, bpf_map_free_deferred);
 331                 schedule_work(&map->work);
 332         }
 333 }
 334
 335 void bpf_map_put(struct bpf_map *map)
 336 {
 337         __bpf_map_put(map, true);
 338 }
 339 EXPORT_SYMBOL_GPL(bpf_map_put);
 340
 341 void bpf_map_put_with_uref(struct bpf_map *map)
 342 {
 343         bpf_map_put_uref(map);
 344         bpf_map_put(map);
 345 }
 346
 347 static int bpf_map_release(struct inode *inode, struct file *filp)
 348 {
 349         struct bpf_map *map = filp->private_data;
 350
 351         if (map->ops->map_release)
 352                 map->ops->map_release(map, filp);
 353
 354         bpf_map_put_with_uref(map);
 355         return 0;
 356 }
 357
 358 static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
 359 {
 360         fmode_t mode = f.file->f_mode;
 361
 362         /* Our file permissions may have been overridden by global
 363          * map permissions facing syscall side.
 364          */
 365         if (READ_ONCE(map->frozen))
 366                 mode &= ~FMODE_CAN_WRITE;
 367         return mode;
 368 }
 369
 370 #ifdef CONFIG_PROC_FS
 371 static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
 372 {
 373         const struct bpf_map *map = filp->private_data;
 374         const struct bpf_array *array;
 375         u32 owner_prog_type = 0;
 376         u32 owner_jited = 0;
 377
 378         if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
 379                 array = container_of(map, struct bpf_array, map);
 380                 owner_prog_type = array->owner_prog_type;
 381                 owner_jited = array->owner_jited;
 382         }
 383
 384         seq_printf(m,
 385                    "map_type:\t%u\n"
 386                    "key_size:\t%u\n"
 387                    "value_size:\t%u\n"
 388                    "max_entries:\t%u\n"
 389                    "map_flags:\t%#x\n"
 390                    "memlock:\t%llu\n"
 391                    "map_id:\t%u\n"
 392                    "frozen:\t%u\n",
 393                    map->map_type,
 394                    map->key_size,
 395                    map->value_size,
 396                    map->max_entries,
 397                    map->map_flags,
 398                    map->pages * 1ULL << PAGE_SHIFT,
 399                    map->id,
 400                    READ_ONCE(map->frozen));
 401
 402         if (owner_prog_type) {
 403                 seq_printf(m, "owner_prog_type:\t%u\n",
 404                            owner_prog_type);
 405                 seq_printf(m, "owner_jited:\t%u\n",
 406                            owner_jited);
 407         }
 408 }
 409 #endif
 410
 411 static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
 412                               loff_t *ppos)
 413 {
 414         /* We need this handler such that alloc_file() enables
 415          * f_mode with FMODE_CAN_READ.
 416          */
 417         return -EINVAL;
 418 }
 419
 420 static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
 421                                size_t siz, loff_t *ppos)
 422 {
 423         /* We need this handler such that alloc_file() enables
 424          * f_mode with FMODE_CAN_WRITE.
 425          */
 426         return -EINVAL;
 427 }
 428
 429 const struct file_operations bpf_map_fops = {
 430 #ifdef CONFIG_PROC_FS
 431         .show_fdinfo    = bpf_map_show_fdinfo,
 432 #endif
 433         .release        = bpf_map_release,
 434         .read           = bpf_dummy_read,
 435         .write          = bpf_dummy_write,
 436 };
 437
 438 int bpf_map_new_fd(struct bpf_map *map, int flags)
 439 {
 440         int ret;
 441
 442         ret = security_bpf_map(map, OPEN_FMODE(flags));
 443         if (ret < 0)
 444                 return ret;
 445
 446         return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
 447                                 flags | O_CLOEXEC);
 448 }
 449
 450 int bpf_get_file_flag(int flags)
 451 {
 452         if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
 453                 return -EINVAL;
 454         if (flags & BPF_F_RDONLY)
 455                 return O_RDONLY;
 456         if (flags & BPF_F_WRONLY)
 457                 return O_WRONLY;
 458         return O_RDWR;
 459 }
 460
 461 /* helper macro to check that unused fields 'union bpf_attr' are zero */
 462 #define CHECK_ATTR(CMD) \
 463         memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
 464                    sizeof(attr->CMD##_LAST_FIELD), 0, \
 465                    sizeof(*attr) - \
 466                    offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
 467                    sizeof(attr->CMD##_LAST_FIELD)) != NULL
 468
 469 /* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes.
 470  * Return 0 on success and < 0 on error.
 471  */
 472 static int bpf_obj_name_cpy(char *dst, const char *src)
 473 {
 474         const char *end = src + BPF_OBJ_NAME_LEN;
 475
 476         memset(dst, 0, BPF_OBJ_NAME_LEN);
 477         /* Copy all isalnum(), '_' and '.' chars. */
 478         while (src < end && *src) {
 479                 if (!isalnum(*src) &&
 480                     *src != '_' && *src != '.')
 481                         return -EINVAL;
 482                 *dst++ = *src++;
 483         }
 484
 485         /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */
 486         if (src == end)
 487                 return -EINVAL;
 488
 489         return 0;
 490 }
 491
 492 int map_check_no_btf(const struct bpf_map *map,
 493                      const struct btf *btf,
 494                      const struct btf_type *key_type,
 495                      const struct btf_type *value_type)
 496 {
 497         return -ENOTSUPP;
 498 }
 499
 500 static int map_check_btf(struct bpf_map *map, const struct btf *btf,
 501                          u32 btf_key_id, u32 btf_value_id)
 502 {
 503         const struct btf_type *key_type, *value_type;
 504         u32 key_size, value_size;
 505         int ret = 0;
 506
 507         /* Some maps allow key to be unspecified. */
 508         if (btf_key_id) {
 509                 key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
 510                 if (!key_type || key_size != map->key_size)
 511                         return -EINVAL;
 512         } else {
 513                 key_type = btf_type_by_id(btf, 0);
 514                 if (!map->ops->map_check_btf)
 515                         return -EINVAL;
 516         }
 517
 518         value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
 519         if (!value_type || value_size != map->value_size)
 520                 return -EINVAL;
 521
 522         map->spin_lock_off = btf_find_spin_lock(btf, value_type);
 523
 524         if (map_value_has_spin_lock(map)) {
 525                 if (map->map_flags & BPF_F_RDONLY_PROG)
 526                         return -EACCES;
 527                 if (map->map_type != BPF_MAP_TYPE_HASH &&
 528                     map->map_type != BPF_MAP_TYPE_ARRAY &&
 529                     map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
 530                     map->map_type != BPF_MAP_TYPE_SK_STORAGE)
 531                         return -ENOTSUPP;
 532                 if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
 533                     map->value_size) {
 534                         WARN_ONCE(1,
 535                                   "verifier bug spin_lock_off %d value_size %d\n",
 536                                   map->spin_lock_off, map->value_size);
 537                         return -EFAULT;
 538                 }
 539         }
 540
 541         if (map->ops->map_check_btf)
 542                 ret = map->ops->map_check_btf(map, btf, key_type, value_type);
 543
 544         return ret;
 545 }
 546
 547 #define BPF_MAP_CREATE_LAST_FIELD btf_value_type_id
 548 /* called via syscall */
 549 static int map_create(union bpf_attr *attr)
 550 {
 551         int numa_node = bpf_map_attr_numa_node(attr);
 552         struct bpf_map *map;
 553         int f_flags;
 554         int err;
 555
 556         err = CHECK_ATTR(BPF_MAP_CREATE);
 557         if (err)
 558                 return -EINVAL;
 559
 560         f_flags = bpf_get_file_flag(attr->map_flags);
 561         if (f_flags < 0)
 562                 return f_flags;
 563
 564         if (numa_node != NUMA_NO_NODE &&
 565             ((unsigned int)numa_node >= nr_node_ids ||
 566              !node_online(numa_node)))
 567                 return -EINVAL;
 568
 569         /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
 570         map = find_and_alloc_map(attr);
 571         if (IS_ERR(map))
 572                 return PTR_ERR(map);
 573
 574         err = bpf_obj_name_cpy(map->name, attr->map_name);
 575         if (err)
 576                 goto free_map_nouncharge;
 577
 578         atomic_set(&map->refcnt, 1);
 579         atomic_set(&map->usercnt, 1);
 580
 581         if (attr->btf_key_type_id || attr->btf_value_type_id) {
 582                 struct btf *btf;
 583
 584                 if (!attr->btf_value_type_id) {
 585                         err = -EINVAL;
 586                         goto free_map_nouncharge;
 587                 }
 588
 589                 btf = btf_get_by_fd(attr->btf_fd);
 590                 if (IS_ERR(btf)) {
 591                         err = PTR_ERR(btf);
 592                         goto free_map_nouncharge;
 593                 }
 594
 595                 err = map_check_btf(map, btf, attr->btf_key_type_id,
 596                                     attr->btf_value_type_id);
 597                 if (err) {
 598                         btf_put(btf);
 599                         goto free_map_nouncharge;
 600                 }
 601
 602                 map->btf = btf;
 603                 map->btf_key_type_id = attr->btf_key_type_id;
 604                 map->btf_value_type_id = attr->btf_value_type_id;
 605         } else {
 606                 map->spin_lock_off = -EINVAL;
 607         }
 608
 609         err = security_bpf_map_alloc(map);
 610         if (err)
 611                 goto free_map_nouncharge;
 612
 613         err = bpf_map_init_memlock(map);
 614         if (err)
 615                 goto free_map_sec;
 616
 617         err = bpf_map_alloc_id(map);
 618         if (err)
 619                 goto free_map;
 620
 621         err = bpf_map_new_fd(map, f_flags);
 622         if (err < 0) {
 623                 /* failed to allocate fd.
 624                  * bpf_map_put_with_uref() is needed because the above
 625                  * bpf_map_alloc_id() has published the map
 626                  * to the userspace and the userspace may
 627                  * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
 628                  */
 629                 bpf_map_put_with_uref(map);
 630                 return err;
 631         }
 632
 633         return err;
 634
 635 free_map:
 636         bpf_map_release_memlock(map);
 637 free_map_sec:
 638         security_bpf_map_free(map);
 639 free_map_nouncharge:
 640         btf_put(map->btf);
 641         map->ops->map_free(map);
 642         return err;
 643 }
 644
 645 /* if error is returned, fd is released.
 646  * On success caller should complete fd access with matching fdput()
 647  */
 648 struct bpf_map *__bpf_map_get(struct fd f)
 649 {
 650         if (!f.file)
 651                 return ERR_PTR(-EBADF);
 652         if (f.file->f_op != &bpf_map_fops) {
 653                 fdput(f);
 654                 return ERR_PTR(-EINVAL);
 655         }
 656
 657         return f.file->private_data;
 658 }
 659
 660 /* prog's and map's refcnt limit */
 661 #define BPF_MAX_REFCNT 32768
 662
 663 struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref)
 664 {
 665         if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) {
 666                 atomic_dec(&map->refcnt);
 667                 return ERR_PTR(-EBUSY);
 668         }
 669         if (uref)
 670                 atomic_inc(&map->usercnt);
 671         return map;
 672 }
 673 EXPORT_SYMBOL_GPL(bpf_map_inc);
 674
 675 struct bpf_map *bpf_map_get_with_uref(u32 ufd)
 676 {
 677         struct fd f = fdget(ufd);
 678         struct bpf_map *map;
 679
 680         map = __bpf_map_get(f);
 681         if (IS_ERR(map))
 682                 return map;
 683
 684         map = bpf_map_inc(map, true);
 685         fdput(f);
 686
 687         return map;
 688 }
 689
 690 /* map_idr_lock should have been held */
 691 static struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map,
 692                                             bool uref)
 693 {
 694         int refold;
 695
 696         refold = atomic_fetch_add_unless(&map->refcnt, 1, 0);
 697
 698         if (refold >= BPF_MAX_REFCNT) {
 699                 __bpf_map_put(map, false);
 700                 return ERR_PTR(-EBUSY);
 701         }
 702
 703         if (!refold)
 704                 return ERR_PTR(-ENOENT);
 705
 706         if (uref)
 707                 atomic_inc(&map->usercnt);
 708
 709         return map;
 710 }
 711
 712 int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
 713 {
 714         return -ENOTSUPP;
 715 }
 716
 717 static void *__bpf_copy_key(void __user *ukey, u64 key_size)
 718 {
 719         if (key_size)
 720                 return memdup_user(ukey, key_size);
 721
 722         if (ukey)
 723                 return ERR_PTR(-EINVAL);
 724
 725         return NULL;
 726 }
 727
 728 /* last field in 'union bpf_attr' used by this command */
 729 #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
 730
 731 static int map_lookup_elem(union bpf_attr *attr)
 732 {
 733         void __user *ukey = u64_to_user_ptr(attr->key);
 734         void __user *uvalue = u64_to_user_ptr(attr->value);
 735         int ufd = attr->map_fd;
 736         struct bpf_map *map;
 737         void *key, *value, *ptr;
 738         u32 value_size;
 739         struct fd f;
 740         int err;
 741
 742         if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
 743                 return -EINVAL;
 744
 745         if (attr->flags & ~BPF_F_LOCK)
 746                 return -EINVAL;
 747
 748         f = fdget(ufd);
 749         map = __bpf_map_get(f);
 750         if (IS_ERR(map))
 751                 return PTR_ERR(map);
 752         if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
 753                 err = -EPERM;
 754                 goto err_put;
 755         }
 756
 757         if ((attr->flags & BPF_F_LOCK) &&
 758             !map_value_has_spin_lock(map)) {
 759                 err = -EINVAL;
 760                 goto err_put;
 761         }
 762
 763         key = __bpf_copy_key(ukey, map->key_size);
 764         if (IS_ERR(key)) {
 765                 err = PTR_ERR(key);
 766                 goto err_put;
 767         }
 768
 769         if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
 770             map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
 771             map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
 772             map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
 773                 value_size = round_up(map->value_size, 8) * num_possible_cpus();
 774         else if (IS_FD_MAP(map))
 775                 value_size = sizeof(u32);
 776         else
 777                 value_size = map->value_size;
 778
 779         err = -ENOMEM;
 780         value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
 781         if (!value)
 782                 goto free_key;
 783
 784         if (bpf_map_is_dev_bound(map)) {
 785                 err = bpf_map_offload_lookup_elem(map, key, value);
 786                 goto done;
 787         }
 788
 789         preempt_disable();
 790         this_cpu_inc(bpf_prog_active);
 791         if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
 792             map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
 793                 err = bpf_percpu_hash_copy(map, key, value);
 794         } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
 795                 err = bpf_percpu_array_copy(map, key, value);
 796         } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
 797                 err = bpf_percpu_cgroup_storage_copy(map, key, value);
 798         } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
 799                 err = bpf_stackmap_copy(map, key, value);
 800         } else if (IS_FD_ARRAY(map)) {
 801                 err = bpf_fd_array_map_lookup_elem(map, key, value);
 802         } else if (IS_FD_HASH(map)) {
 803                 err = bpf_fd_htab_map_lookup_elem(map, key, value);
 804         } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
 805                 err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
 806         } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
 807                    map->map_type == BPF_MAP_TYPE_STACK) {
 808                 err = map->ops->map_peek_elem(map, value);
 809         } else {
 810                 rcu_read_lock();
 811                 if (map->ops->map_lookup_elem_sys_only)
 812                         ptr = map->ops->map_lookup_elem_sys_only(map, key);
 813                 else
 814                         ptr = map->ops->map_lookup_elem(map, key);
 815                 if (IS_ERR(ptr)) {
 816                         err = PTR_ERR(ptr);
 817                 } else if (!ptr) {
 818                         err = -ENOENT;
 819                 } else {
 820                         err = 0;
 821                         if (attr->flags & BPF_F_LOCK)
 822                                 /* lock 'ptr' and copy everything but lock */
 823                                 copy_map_value_locked(map, value, ptr, true);
 824                         else
 825                                 copy_map_value(map, value, ptr);
 826                         /* mask lock, since value wasn't zero inited */
 827                         check_and_init_map_lock(map, value);
 828                 }
 829                 rcu_read_unlock();
 830         }
 831         this_cpu_dec(bpf_prog_active);
 832         preempt_enable();
 833
 834 done:
 835         if (err)
 836                 goto free_value;
 837
 838         err = -EFAULT;
 839         if (copy_to_user(uvalue, value, value_size) != 0)
 840                 goto free_value;
 841
 842         err = 0;
 843
 844 free_value:
 845         kfree(value);
 846 free_key:
 847         kfree(key);
 848 err_put:
 849         fdput(f);
 850         return err;
 851 }
 852
 853 static void maybe_wait_bpf_programs(struct bpf_map *map)
 854 {
 855         /* Wait for any running BPF programs to complete so that
 856          * userspace, when we return to it, knows that all programs
 857          * that could be running use the new map value.
 858          */
 859         if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
 860             map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
 861                 synchronize_rcu();
 862 }
 863
 864 #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
 865
 866 static int map_update_elem(union bpf_attr *attr)
 867 {
 868         void __user *ukey = u64_to_user_ptr(attr->key);
 869         void __user *uvalue = u64_to_user_ptr(attr->value);
 870         int ufd = attr->map_fd;
 871         struct bpf_map *map;
 872         void *key, *value;
 873         u32 value_size;
 874         struct fd f;
 875         int err;
 876
 877         if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
 878                 return -EINVAL;
 879
 880         f = fdget(ufd);
 881         map = __bpf_map_get(f);
 882         if (IS_ERR(map))
 883                 return PTR_ERR(map);
 884         if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
 885                 err = -EPERM;
 886                 goto err_put;
 887         }
 888
 889         if ((attr->flags & BPF_F_LOCK) &&
 890             !map_value_has_spin_lock(map)) {
 891                 err = -EINVAL;
 892                 goto err_put;
 893         }
 894
 895         key = __bpf_copy_key(ukey, map->key_size);
 896         if (IS_ERR(key)) {
 897                 err = PTR_ERR(key);
 898                 goto err_put;
 899         }
 900
 901         if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
 902             map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
 903             map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
 904             map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
 905                 value_size = round_up(map->value_size, 8) * num_possible_cpus();
 906         else
 907                 value_size = map->value_size;
 908
 909         err = -ENOMEM;
 910         value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
 911         if (!value)
 912                 goto free_key;
 913
 914         err = -EFAULT;
 915         if (copy_from_user(value, uvalue, value_size) != 0)
 916                 goto free_value;
 917
 918         /* Need to create a kthread, thus must support schedule */
 919         if (bpf_map_is_dev_bound(map)) {
 920                 err = bpf_map_offload_update_elem(map, key, value, attr->flags);
 921                 goto out;
 922         } else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
 923                    map->map_type == BPF_MAP_TYPE_SOCKHASH ||
 924                    map->map_type == BPF_MAP_TYPE_SOCKMAP) {
 925                 err = map->ops->map_update_elem(map, key, value, attr->flags);
 926                 goto out;
 927         }
 928
 929         /* must increment bpf_prog_active to avoid kprobe+bpf triggering from
 930          * inside bpf map update or delete otherwise deadlocks are possible
 931          */
 932         preempt_disable();
 933         __this_cpu_inc(bpf_prog_active);
 934         if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
 935             map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
 936                 err = bpf_percpu_hash_update(map, key, value, attr->flags);
 937         } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
 938                 err = bpf_percpu_array_update(map, key, value, attr->flags);
 939         } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
 940                 err = bpf_percpu_cgroup_storage_update(map, key, value,
 941                                                        attr->flags);
 942         } else if (IS_FD_ARRAY(map)) {
 943                 rcu_read_lock();
 944                 err = bpf_fd_array_map_update_elem(map, f.file, key, value,
 945                                                    attr->flags);
 946                 rcu_read_unlock();
 947         } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
 948                 rcu_read_lock();
 949                 err = bpf_fd_htab_map_update_elem(map, f.file, key, value,
 950                                                   attr->flags);
 951                 rcu_read_unlock();
 952         } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
 953                 /* rcu_read_lock() is not needed */
 954                 err = bpf_fd_reuseport_array_update_elem(map, key, value,
 955                                                          attr->flags);
 956         } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
 957                    map->map_type == BPF_MAP_TYPE_STACK) {
 958                 err = map->ops->map_push_elem(map, value, attr->flags);
 959         } else {
 960                 rcu_read_lock();
 961                 err = map->ops->map_update_elem(map, key, value, attr->flags);
 962                 rcu_read_unlock();
 963         }
 964         __this_cpu_dec(bpf_prog_active);
 965         preempt_enable();
 966         maybe_wait_bpf_programs(map);
 967 out:
 968 free_value:
 969         kfree(value);
 970 free_key:
 971         kfree(key);
 972 err_put:
 973         fdput(f);
 974         return err;
 975 }
 976
 977 #define BPF_MAP_DELETE_ELEM_LAST_FIELD key
 978
 979 static int map_delete_elem(union bpf_attr *attr)
 980 {
 981         void __user *ukey = u64_to_user_ptr(attr->key);
 982         int ufd = attr->map_fd;
 983         struct bpf_map *map;
 984         struct fd f;
 985         void *key;
 986         int err;
 987
 988         if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
 989                 return -EINVAL;
 990
 991         f = fdget(ufd);
 992         map = __bpf_map_get(f);
 993         if (IS_ERR(map))
 994                 return PTR_ERR(map);
 995         if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
 996                 err = -EPERM;
 997                 goto err_put;
 998         }
 999
1000         key = __bpf_copy_key(ukey, map->key_size);
1001         if (IS_ERR(key)) {
1002                 err = PTR_ERR(key);
1003                 goto err_put;
1004         }
1005
1006         if (bpf_map_is_dev_bound(map)) {
1007                 err = bpf_map_offload_delete_elem(map, key);
1008                 goto out;
1009         }
1010
1011         preempt_disable();
1012         __this_cpu_inc(bpf_prog_active);
1013         rcu_read_lock();
1014         err = map->ops->map_delete_elem(map, key);
1015         rcu_read_unlock();
1016         __this_cpu_dec(bpf_prog_active);
1017         preempt_enable();
1018         maybe_wait_bpf_programs(map);
1019 out:
1020         kfree(key);
1021 err_put:
1022         fdput(f);
1023         return err;
1024 }
1025
1026 /* last field in 'union bpf_attr' used by this command */
1027 #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
1028
1029 static int map_get_next_key(union bpf_attr *attr)
1030 {
1031         void __user *ukey = u64_to_user_ptr(attr->key);
1032         void __user *unext_key = u64_to_user_ptr(attr->next_key);
1033         int ufd = attr->map_fd;
1034         struct bpf_map *map;
1035         void *key, *next_key;
1036         struct fd f;
1037         int err;
1038
1039         if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
1040                 return -EINVAL;
1041
1042         f = fdget(ufd);
1043         map = __bpf_map_get(f);
1044         if (IS_ERR(map))
1045                 return PTR_ERR(map);
1046         if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
1047                 err = -EPERM;
1048                 goto err_put;
1049         }
1050
1051         if (ukey) {
1052                 key = __bpf_copy_key(ukey, map->key_size);
1053                 if (IS_ERR(key)) {
1054                         err = PTR_ERR(key);
1055                         goto err_put;
1056                 }
1057         } else {
1058                 key = NULL;
1059         }
1060
1061         err = -ENOMEM;
1062         next_key = kmalloc(map->key_size, GFP_USER);
1063         if (!next_key)
1064                 goto free_key;
1065
1066         if (bpf_map_is_dev_bound(map)) {
1067                 err = bpf_map_offload_get_next_key(map, key, next_key);
1068                 goto out;
1069         }
1070
1071         rcu_read_lock();
1072         err = map->ops->map_get_next_key(map, key, next_key);
1073         rcu_read_unlock();
1074 out:
1075         if (err)
1076                 goto free_next_key;
1077
1078         err = -EFAULT;
1079         if (copy_to_user(unext_key, next_key, map->key_size) != 0)
1080                 goto free_next_key;
1081
1082         err = 0;
1083
1084 free_next_key:
1085         kfree(next_key);
1086 free_key:
1087         kfree(key);
1088 err_put:
1089         fdput(f);
1090         return err;
1091 }
1092
1093 #define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value
1094
1095 static int map_lookup_and_delete_elem(union bpf_attr *attr)
1096 {
1097         void __user *ukey = u64_to_user_ptr(attr->key);
1098         void __user *uvalue = u64_to_user_ptr(attr->value);
1099         int ufd = attr->map_fd;
1100         struct bpf_map *map;
1101         void *key, *value;
1102         u32 value_size;
1103         struct fd f;
1104         int err;
1105
1106         if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM))
1107                 return -EINVAL;
1108
1109         f = fdget(ufd);
1110         map = __bpf_map_get(f);
1111         if (IS_ERR(map))
1112                 return PTR_ERR(map);
1113         if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1114                 err = -EPERM;
1115                 goto err_put;
1116         }
1117
1118         key = __bpf_copy_key(ukey, map->key_size);
1119         if (IS_ERR(key)) {
1120                 err = PTR_ERR(key);
1121                 goto err_put;
1122         }
1123
1124         value_size = map->value_size;
1125
1126         err = -ENOMEM;
1127         value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
1128         if (!value)
1129                 goto free_key;
1130
1131         if (map->map_type == BPF_MAP_TYPE_QUEUE ||
1132             map->map_type == BPF_MAP_TYPE_STACK) {
1133                 err = map->ops->map_pop_elem(map, value);
1134         } else {
1135                 err = -ENOTSUPP;
1136         }
1137
1138         if (err)
1139                 goto free_value;
1140
1141         if (copy_to_user(uvalue, value, value_size) != 0)
1142                 goto free_value;
1143
1144         err = 0;
1145
1146 free_value:
1147         kfree(value);
1148 free_key:
1149         kfree(key);
1150 err_put:
1151         fdput(f);
1152         return err;
1153 }
1154
1155 #define BPF_MAP_FREEZE_LAST_FIELD map_fd
1156
1157 static int map_freeze(const union bpf_attr *attr)
1158 {
1159         int err = 0, ufd = attr->map_fd;
1160         struct bpf_map *map;
1161         struct fd f;
1162
1163         if (CHECK_ATTR(BPF_MAP_FREEZE))
1164                 return -EINVAL;
1165
1166         f = fdget(ufd);
1167         map = __bpf_map_get(f);
1168         if (IS_ERR(map))
1169                 return PTR_ERR(map);
1170         if (READ_ONCE(map->frozen)) {
1171                 err = -EBUSY;
1172                 goto err_put;
1173         }
1174         if (!capable(CAP_SYS_ADMIN)) {
1175                 err = -EPERM;
1176                 goto err_put;
1177         }
1178
1179         WRITE_ONCE(map->frozen, true);
1180 err_put:
1181         fdput(f);
1182         return err;
1183 }
1184
1185 static const struct bpf_prog_ops * const bpf_prog_types[] = {
1186 #define BPF_PROG_TYPE(_id, _name) \
1187         [_id] = & _name ## _prog_ops,
1188 #define BPF_MAP_TYPE(_id, _ops)
1189 #include <linux/bpf_types.h>
1190 #undef BPF_PROG_TYPE
1191 #undef BPF_MAP_TYPE
1192 };
1193
1194 static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
1195 {
1196         const struct bpf_prog_ops *ops;
1197
1198         if (type >= ARRAY_SIZE(bpf_prog_types))
1199                 return -EINVAL;
1200         type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
1201         ops = bpf_prog_types[type];
1202         if (!ops)
1203                 return -EINVAL;
1204
1205         if (!bpf_prog_is_dev_bound(prog->aux))
1206                 prog->aux->ops = ops;
1207         else
1208                 prog->aux->ops = &bpf_offload_prog_ops;
1209         prog->type = type;
1210         return 0;
1211 }
1212
1213 /* drop refcnt on maps used by eBPF program and free auxilary data */
1214 static void free_used_maps(struct bpf_prog_aux *aux)
1215 {
1216         enum bpf_cgroup_storage_type stype;
1217         int i;
1218
1219         for_each_cgroup_storage_type(stype) {
1220                 if (!aux->cgroup_storage[stype])
1221                         continue;
1222                 bpf_cgroup_storage_release(aux->prog,
1223                                            aux->cgroup_storage[stype]);
1224         }
1225
1226         for (i = 0; i < aux->used_map_cnt; i++)
1227                 bpf_map_put(aux->used_maps[i]);
1228
1229         kfree(aux->used_maps);
1230 }
1231
1232 int __bpf_prog_charge(struct user_struct *user, u32 pages)
1233 {
1234         unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
1235         unsigned long user_bufs;
1236
1237         if (user) {
1238                 user_bufs = atomic_long_add_return(pages, &user->locked_vm);
1239                 if (user_bufs > memlock_limit) {
1240                         atomic_long_sub(pages, &user->locked_vm);
1241                         return -EPERM;
1242                 }
1243         }
1244
1245         return 0;
1246 }
1247
1248 void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1249 {
1250         if (user)
1251                 atomic_long_sub(pages, &user->locked_vm);
1252 }
1253
1254 static int bpf_prog_charge_memlock(struct bpf_prog *prog)
1255 {
1256         struct user_struct *user = get_current_user();
1257         int ret;
1258
1259         ret = __bpf_prog_charge(user, prog->pages);
1260         if (ret) {
1261                 free_uid(user);
1262                 return ret;
1263         }
1264
1265         prog->aux->user = user;
1266         return 0;
1267 }
1268
1269 static void bpf_prog_uncharge_memlock(struct bpf_prog *prog)
1270 {
1271         struct user_struct *user = prog->aux->user;
1272
1273         __bpf_prog_uncharge(user, prog->pages);
1274         free_uid(user);
1275 }
1276
1277 static int bpf_prog_alloc_id(struct bpf_prog *prog)
1278 {
1279         int id;
1280
1281         idr_preload(GFP_KERNEL);
1282         spin_lock_bh(&prog_idr_lock);
1283         id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
1284         if (id > 0)
1285                 prog->aux->id = id;
1286         spin_unlock_bh(&prog_idr_lock);
1287         idr_preload_end();
1288
1289         /* id is in [1, INT_MAX) */
1290         if (WARN_ON_ONCE(!id))
1291                 return -ENOSPC;
1292
1293         return id > 0 ? 0 : id;
1294 }
1295
1296 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock)
1297 {
1298         /* cBPF to eBPF migrations are currently not in the idr store.
1299          * Offloaded programs are removed from the store when their device
1300          * disappears - even if someone grabs an fd to them they are unusable,
1301          * simply waiting for refcnt to drop to be freed.
1302          */
1303         if (!prog->aux->id)
1304                 return;
1305
1306         if (do_idr_lock)
1307                 spin_lock_bh(&prog_idr_lock);
1308         else
1309                 __acquire(&prog_idr_lock);
1310
1311         idr_remove(&prog_idr, prog->aux->id);
1312         prog->aux->id = 0;
1313
1314         if (do_idr_lock)
1315                 spin_unlock_bh(&prog_idr_lock);
1316         else
1317                 __release(&prog_idr_lock);
1318 }
1319
1320 static void __bpf_prog_put_rcu(struct rcu_head *rcu)
1321 {
1322         struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
1323
1324         free_used_maps(aux);
1325         bpf_prog_uncharge_memlock(aux->prog);
1326         security_bpf_prog_free(aux);
1327         bpf_prog_free(aux->prog);
1328 }
1329
1330 static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
1331 {
1332         if (atomic_dec_and_test(&prog->aux->refcnt)) {
1333                 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
1334                 /* bpf_prog_free_id() must be called first */
1335                 bpf_prog_free_id(prog, do_idr_lock);
1336                 bpf_prog_kallsyms_del_all(prog);
1337                 btf_put(prog->aux->btf);
1338                 kvfree(prog->aux->func_info);
1339                 bpf_prog_free_linfo(prog);
1340
1341                 call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
1342         }
1343 }
1344
1345 void bpf_prog_put(struct bpf_prog *prog)
1346 {
1347         __bpf_prog_put(prog, true);
1348 }
1349 EXPORT_SYMBOL_GPL(bpf_prog_put);
1350
1351 static int bpf_prog_release(struct inode *inode, struct file *filp)
1352 {
1353         struct bpf_prog *prog = filp->private_data;
1354
1355         bpf_prog_put(prog);
1356         return 0;
1357 }
1358
1359 static void bpf_prog_get_stats(const struct bpf_prog *prog,
1360                                struct bpf_prog_stats *stats)
1361 {
1362         u64 nsecs = 0, cnt = 0;
1363         int cpu;
1364
1365         for_each_possible_cpu(cpu) {
1366                 const struct bpf_prog_stats *st;
1367                 unsigned int start;
1368                 u64 tnsecs, tcnt;
1369
1370                 st = per_cpu_ptr(prog->aux->stats, cpu);
1371                 do {
1372                         start = u64_stats_fetch_begin_irq(&st->syncp);
1373                         tnsecs = st->nsecs;
1374                         tcnt = st->cnt;
1375                 } while (u64_stats_fetch_retry_irq(&st->syncp, start));
1376                 nsecs += tnsecs;
1377                 cnt += tcnt;
1378         }
1379         stats->nsecs = nsecs;
1380         stats->cnt = cnt;
1381 }
1382
1383 #ifdef CONFIG_PROC_FS
1384 static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
1385 {
1386         const struct bpf_prog *prog = filp->private_data;
1387         char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
1388         struct bpf_prog_stats stats;
1389
1390         bpf_prog_get_stats(prog, &stats);
1391         bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
1392         seq_printf(m,
1393                    "prog_type:\t%u\n"
1394                    "prog_jited:\t%u\n"
1395                    "prog_tag:\t%s\n"
1396                    "memlock:\t%llu\n"
1397                    "prog_id:\t%u\n"
1398                    "run_time_ns:\t%llu\n"
1399                    "run_cnt:\t%llu\n",
1400                    prog->type,
1401                    prog->jited,
1402                    prog_tag,
1403                    prog->pages * 1ULL << PAGE_SHIFT,
1404                    prog->aux->id,
1405                    stats.nsecs,
1406                    stats.cnt);
1407 }
1408 #endif
1409
1410 const struct file_operations bpf_prog_fops = {
1411 #ifdef CONFIG_PROC_FS
1412         .show_fdinfo    = bpf_prog_show_fdinfo,
1413 #endif
1414         .release        = bpf_prog_release,
1415         .read           = bpf_dummy_read,
1416         .write          = bpf_dummy_write,
1417 };
1418
1419 int bpf_prog_new_fd(struct bpf_prog *prog)
1420 {
1421         int ret;
1422
1423         ret = security_bpf_prog(prog);
1424         if (ret < 0)
1425                 return ret;
1426
1427         return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
1428                                 O_RDWR | O_CLOEXEC);
1429 }
1430
1431 static struct bpf_prog *____bpf_prog_get(struct fd f)
1432 {
1433         if (!f.file)
1434                 return ERR_PTR(-EBADF);
1435         if (f.file->f_op != &bpf_prog_fops) {
1436                 fdput(f);
1437                 return ERR_PTR(-EINVAL);
1438         }
1439
1440         return f.file->private_data;
1441 }
1442
1443 struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i)
1444 {
1445         if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) {
1446                 atomic_sub(i, &prog->aux->refcnt);
1447                 return ERR_PTR(-EBUSY);
1448         }
1449         return prog;
1450 }
1451 EXPORT_SYMBOL_GPL(bpf_prog_add);
1452
1453 void bpf_prog_sub(struct bpf_prog *prog, int i)
1454 {
1455         /* Only to be used for undoing previous bpf_prog_add() in some
1456          * error path. We still know that another entity in our call
1457          * path holds a reference to the program, thus atomic_sub() can
1458          * be safely used in such cases!
1459          */
1460         WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0);
1461 }
1462 EXPORT_SYMBOL_GPL(bpf_prog_sub);
1463
1464 struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
1465 {
1466         return bpf_prog_add(prog, 1);
1467 }
1468 EXPORT_SYMBOL_GPL(bpf_prog_inc);
1469
1470 /* prog_idr_lock should have been held */
1471 struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
1472 {
1473         int refold;
1474
1475         refold = atomic_fetch_add_unless(&prog->aux->refcnt, 1, 0);
1476
1477         if (refold >= BPF_MAX_REFCNT) {
1478                 __bpf_prog_put(prog, false);
1479                 return ERR_PTR(-EBUSY);
1480         }
1481
1482         if (!refold)
1483                 return ERR_PTR(-ENOENT);
1484
1485         return prog;
1486 }
1487 EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
1488
1489 bool bpf_prog_get_ok(struct bpf_prog *prog,
1490                             enum bpf_prog_type *attach_type, bool attach_drv)
1491 {
1492         /* not an attachment, just a refcount inc, always allow */
1493         if (!attach_type)
1494                 return true;
1495
1496         if (prog->type != *attach_type)
1497                 return false;
1498         if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv)
1499                 return false;
1500
1501         return true;
1502 }
1503
1504 static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
1505                                        bool attach_drv)
1506 {
1507         struct fd f = fdget(ufd);
1508         struct bpf_prog *prog;
1509
1510         prog = ____bpf_prog_get(f);
1511         if (IS_ERR(prog))
1512                 return prog;
1513         if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
1514                 prog = ERR_PTR(-EINVAL);
1515                 goto out;
1516         }
1517
1518         prog = bpf_prog_inc(prog);
1519 out:
1520         fdput(f);
1521         return prog;
1522 }
1523
1524 struct bpf_prog *bpf_prog_get(u32 ufd)
1525 {
1526         return __bpf_prog_get(ufd, NULL, false);
1527 }
1528
1529 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1530                                        bool attach_drv)
1531 {
1532         return __bpf_prog_get(ufd, &type, attach_drv);
1533 }
1534 EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
1535
1536 /* Initially all BPF programs could be loaded w/o specifying
1537  * expected_attach_type. Later for some of them specifying expected_attach_type
1538  * at load time became required so that program could be validated properly.
1539  * Programs of types that are allowed to be loaded both w/ and w/o (for
1540  * backward compatibility) expected_attach_type, should have the default attach
1541  * type assigned to expected_attach_type for the latter case, so that it can be
1542  * validated later at attach time.
1543  *
1544  * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
1545  * prog type requires it but has some attach types that have to be backward
1546  * compatible.
1547  */
1548 static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
1549 {
1550         switch (attr->prog_type) {
1551         case BPF_PROG_TYPE_CGROUP_SOCK:
1552                 /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
1553                  * exist so checking for non-zero is the way to go here.
1554                  */
1555                 if (!attr->expected_attach_type)
1556                         attr->expected_attach_type =
1557                                 BPF_CGROUP_INET_SOCK_CREATE;
1558                 break;
1559         }
1560 }
1561
1562 static int
1563 bpf_prog_load_check_attach_type(enum bpf_prog_type prog_type,
1564                                 enum bpf_attach_type expected_attach_type)
1565 {
1566         switch (prog_type) {
1567         case BPF_PROG_TYPE_CGROUP_SOCK:
1568                 switch (expected_attach_type) {
1569                 case BPF_CGROUP_INET_SOCK_CREATE:
1570                 case BPF_CGROUP_INET4_POST_BIND:
1571                 case BPF_CGROUP_INET6_POST_BIND:
1572                         return 0;
1573                 default:
1574                         return -EINVAL;
1575                 }
1576         case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1577                 switch (expected_attach_type) {
1578                 case BPF_CGROUP_INET4_BIND:
1579                 case BPF_CGROUP_INET6_BIND:
1580                 case BPF_CGROUP_INET4_CONNECT:
1581                 case BPF_CGROUP_INET6_CONNECT:
1582                 case BPF_CGROUP_UDP4_SENDMSG:
1583                 case BPF_CGROUP_UDP6_SENDMSG:
1584                         return 0;
1585                 default:
1586                         return -EINVAL;
1587                 }
1588         default:
1589                 return 0;
1590         }
1591 }
1592
1593 /* last field in 'union bpf_attr' used by this command */
1594 #define BPF_PROG_LOAD_LAST_FIELD line_info_cnt
1595
1596 static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
1597 {
1598         enum bpf_prog_type type = attr->prog_type;
1599         struct bpf_prog *prog;
1600         int err;
1601         char license[128];
1602         bool is_gpl;
1603
1604         if (CHECK_ATTR(BPF_PROG_LOAD))
1605                 return -EINVAL;
1606
1607         if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
1608                                  BPF_F_ANY_ALIGNMENT |
1609                                  BPF_F_TEST_RND_HI32))
1610                 return -EINVAL;
1611
1612         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
1613             (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
1614             !capable(CAP_SYS_ADMIN))
1615                 return -EPERM;
1616
1617         /* copy eBPF program license from user space */
1618         if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
1619                               sizeof(license) - 1) < 0)
1620                 return -EFAULT;
1621         license[sizeof(license) - 1] = 0;
1622
1623         /* eBPF programs must be GPL compatible to use GPL-ed functions */
1624         is_gpl = license_is_gpl_compatible(license);
1625
1626         if (attr->insn_cnt == 0 ||
1627             attr->insn_cnt > (capable(CAP_SYS_ADMIN) ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
1628                 return -E2BIG;
1629         if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
1630             type != BPF_PROG_TYPE_CGROUP_SKB &&
1631             !capable(CAP_SYS_ADMIN))
1632                 return -EPERM;
1633
1634         bpf_prog_load_fixup_attach_type(attr);
1635         if (bpf_prog_load_check_attach_type(type, attr->expected_attach_type))
1636                 return -EINVAL;
1637
1638         /* plain bpf_prog allocation */
1639         prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
1640         if (!prog)
1641                 return -ENOMEM;
1642
1643         prog->expected_attach_type = attr->expected_attach_type;
1644
1645         prog->aux->offload_requested = !!attr->prog_ifindex;
1646
1647         err = security_bpf_prog_alloc(prog->aux);
1648         if (err)
1649                 goto free_prog_nouncharge;
1650
1651         err = bpf_prog_charge_memlock(prog);
1652         if (err)
1653                 goto free_prog_sec;
1654
1655         prog->len = attr->insn_cnt;
1656
1657         err = -EFAULT;
1658         if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
1659                            bpf_prog_insn_size(prog)) != 0)
1660                 goto free_prog;
1661
1662         prog->orig_prog = NULL;
1663         prog->jited = 0;
1664
1665         atomic_set(&prog->aux->refcnt, 1);
1666         prog->gpl_compatible = is_gpl ? 1 : 0;
1667
1668         if (bpf_prog_is_dev_bound(prog->aux)) {
1669                 err = bpf_prog_offload_init(prog, attr);
1670                 if (err)
1671                         goto free_prog;
1672         }
1673
1674         /* find program type: socket_filter vs tracing_filter */
1675         err = find_prog_type(type, prog);
1676         if (err < 0)
1677                 goto free_prog;
1678
1679         prog->aux->load_time = ktime_get_boot_ns();
1680         err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name);
1681         if (err)
1682                 goto free_prog;
1683
1684         /* run eBPF verifier */
1685         err = bpf_check(&prog, attr, uattr);
1686         if (err < 0)
1687                 goto free_used_maps;
1688
1689         prog = bpf_prog_select_runtime(prog, &err);
1690         if (err < 0)
1691                 goto free_used_maps;
1692
1693         err = bpf_prog_alloc_id(prog);
1694         if (err)
1695                 goto free_used_maps;
1696
1697         err = bpf_prog_new_fd(prog);
1698         if (err < 0) {
1699                 /* failed to allocate fd.
1700                  * bpf_prog_put() is needed because the above
1701                  * bpf_prog_alloc_id() has published the prog
1702                  * to the userspace and the userspace may
1703                  * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID.
1704                  */
1705                 bpf_prog_put(prog);
1706                 return err;
1707         }
1708
1709         bpf_prog_kallsyms_add(prog);
1710         perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
1711         return err;
1712
1713 free_used_maps:
1714         bpf_prog_free_linfo(prog);
1715         kvfree(prog->aux->func_info);
1716         btf_put(prog->aux->btf);
1717         bpf_prog_kallsyms_del_subprogs(prog);
1718         free_used_maps(prog->aux);
1719 free_prog:
1720         bpf_prog_uncharge_memlock(prog);
1721 free_prog_sec:
1722         security_bpf_prog_free(prog->aux);
1723 free_prog_nouncharge:
1724         bpf_prog_free(prog);
1725         return err;
1726 }
1727
1728 #define BPF_OBJ_LAST_FIELD file_flags
1729
1730 static int bpf_obj_pin(const union bpf_attr *attr)
1731 {
1732         if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
1733                 return -EINVAL;
1734
1735         return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
1736 }
1737
1738 static int bpf_obj_get(const union bpf_attr *attr)
1739 {
1740         if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
1741             attr->file_flags & ~BPF_OBJ_FLAG_MASK)
1742                 return -EINVAL;
1743
1744         return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
1745                                 attr->file_flags);
1746 }
1747
1748 struct bpf_raw_tracepoint {
1749         struct bpf_raw_event_map *btp;
1750         struct bpf_prog *prog;
1751 };
1752
1753 static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp)
1754 {
1755         struct bpf_raw_tracepoint *raw_tp = filp->private_data;
1756
1757         if (raw_tp->prog) {
1758                 bpf_probe_unregister(raw_tp->btp, raw_tp->prog);
1759                 bpf_prog_put(raw_tp->prog);
1760         }
1761         bpf_put_raw_tracepoint(raw_tp->btp);
1762         kfree(raw_tp);
1763         return 0;
1764 }
1765
1766 static const struct file_operations bpf_raw_tp_fops = {
1767         .release        = bpf_raw_tracepoint_release,
1768         .read           = bpf_dummy_read,
1769         .write          = bpf_dummy_write,
1770 };
1771
1772 #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
1773
1774 static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
1775 {
1776         struct bpf_raw_tracepoint *raw_tp;
1777         struct bpf_raw_event_map *btp;
1778         struct bpf_prog *prog;
1779         char tp_name[128];
1780         int tp_fd, err;
1781
1782         if (strncpy_from_user(tp_name, u64_to_user_ptr(attr->raw_tracepoint.name),
1783                               sizeof(tp_name) - 1) < 0)
1784                 return -EFAULT;
1785         tp_name[sizeof(tp_name) - 1] = 0;
1786
1787         btp = bpf_get_raw_tracepoint(tp_name);
1788         if (!btp)
1789                 return -ENOENT;
1790
1791         raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER);
1792         if (!raw_tp) {
1793                 err = -ENOMEM;
1794                 goto out_put_btp;
1795         }
1796         raw_tp->btp = btp;
1797
1798         prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
1799         if (IS_ERR(prog)) {
1800                 err = PTR_ERR(prog);
1801                 goto out_free_tp;
1802         }
1803         if (prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT &&
1804             prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE) {
1805                 err = -EINVAL;
1806                 goto out_put_prog;
1807         }
1808
1809         err = bpf_probe_register(raw_tp->btp, prog);
1810         if (err)
1811                 goto out_put_prog;
1812
1813         raw_tp->prog = prog;
1814         tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp,
1815                                  O_CLOEXEC);
1816         if (tp_fd < 0) {
1817                 bpf_probe_unregister(raw_tp->btp, prog);
1818                 err = tp_fd;
1819                 goto out_put_prog;
1820         }
1821         return tp_fd;
1822
1823 out_put_prog:
1824         bpf_prog_put(prog);
1825 out_free_tp:
1826         kfree(raw_tp);
1827 out_put_btp:
1828         bpf_put_raw_tracepoint(btp);
1829         return err;
1830 }
1831
1832 static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
1833                                              enum bpf_attach_type attach_type)
1834 {
1835         switch (prog->type) {
1836         case BPF_PROG_TYPE_CGROUP_SOCK:
1837         case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1838                 return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
1839         default:
1840                 return 0;
1841         }
1842 }
1843
1844 #define BPF_PROG_ATTACH_LAST_FIELD attach_flags
1845
1846 #define BPF_F_ATTACH_MASK \
1847         (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI)
1848
1849 static int bpf_prog_attach(const union bpf_attr *attr)
1850 {
1851         enum bpf_prog_type ptype;
1852         struct bpf_prog *prog;
1853         int ret;
1854
1855         if (!capable(CAP_NET_ADMIN))
1856                 return -EPERM;
1857
1858         if (CHECK_ATTR(BPF_PROG_ATTACH))
1859                 return -EINVAL;
1860
1861         if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
1862                 return -EINVAL;
1863
1864         switch (attr->attach_type) {
1865         case BPF_CGROUP_INET_INGRESS:
1866         case BPF_CGROUP_INET_EGRESS:
1867                 ptype = BPF_PROG_TYPE_CGROUP_SKB;
1868                 break;
1869         case BPF_CGROUP_INET_SOCK_CREATE:
1870         case BPF_CGROUP_INET4_POST_BIND:
1871         case BPF_CGROUP_INET6_POST_BIND:
1872                 ptype = BPF_PROG_TYPE_CGROUP_SOCK;
1873                 break;
1874         case BPF_CGROUP_INET4_BIND:
1875         case BPF_CGROUP_INET6_BIND:
1876         case BPF_CGROUP_INET4_CONNECT:
1877         case BPF_CGROUP_INET6_CONNECT:
1878         case BPF_CGROUP_UDP4_SENDMSG:
1879         case BPF_CGROUP_UDP6_SENDMSG:
1880                 ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
1881                 break;
1882         case BPF_CGROUP_SOCK_OPS:
1883                 ptype = BPF_PROG_TYPE_SOCK_OPS;
1884                 break;
1885         case BPF_CGROUP_DEVICE:
1886                 ptype = BPF_PROG_TYPE_CGROUP_DEVICE;
1887                 break;
1888         case BPF_SK_MSG_VERDICT:
1889                 ptype = BPF_PROG_TYPE_SK_MSG;
1890                 break;
1891         case BPF_SK_SKB_STREAM_PARSER:
1892         case BPF_SK_SKB_STREAM_VERDICT:
1893                 ptype = BPF_PROG_TYPE_SK_SKB;
1894                 break;
1895         case BPF_LIRC_MODE2:
1896                 ptype = BPF_PROG_TYPE_LIRC_MODE2;
1897                 break;
1898         case BPF_FLOW_DISSECTOR:
1899                 ptype = BPF_PROG_TYPE_FLOW_DISSECTOR;
1900                 break;
1901         case BPF_CGROUP_SYSCTL:
1902                 ptype = BPF_PROG_TYPE_CGROUP_SYSCTL;
1903                 break;
1904         default:
1905                 return -EINVAL;
1906         }
1907
1908         prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
1909         if (IS_ERR(prog))
1910                 return PTR_ERR(prog);
1911
1912         if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
1913                 bpf_prog_put(prog);
1914                 return -EINVAL;
1915         }
1916
1917         switch (ptype) {
1918         case BPF_PROG_TYPE_SK_SKB:
1919         case BPF_PROG_TYPE_SK_MSG:
1920                 ret = sock_map_get_from_fd(attr, prog);
1921                 break;
1922         case BPF_PROG_TYPE_LIRC_MODE2:
1923                 ret = lirc_prog_attach(attr, prog);
1924                 break;
1925         case BPF_PROG_TYPE_FLOW_DISSECTOR:
1926                 ret = skb_flow_dissector_bpf_prog_attach(attr, prog);
1927                 break;
1928         default:
1929                 ret = cgroup_bpf_prog_attach(attr, ptype, prog);
1930         }
1931
1932         if (ret)
1933                 bpf_prog_put(prog);
1934         return ret;
1935 }
1936
1937 #define BPF_PROG_DETACH_LAST_FIELD attach_type
1938
1939 static int bpf_prog_detach(const union bpf_attr *attr)
1940 {
1941         enum bpf_prog_type ptype;
1942
1943         if (!capable(CAP_NET_ADMIN))
1944                 return -EPERM;
1945
1946         if (CHECK_ATTR(BPF_PROG_DETACH))
1947                 return -EINVAL;
1948
1949         switch (attr->attach_type) {
1950         case BPF_CGROUP_INET_INGRESS:
1951         case BPF_CGROUP_INET_EGRESS:
1952                 ptype = BPF_PROG_TYPE_CGROUP_SKB;
1953                 break;
1954         case BPF_CGROUP_INET_SOCK_CREATE:
1955         case BPF_CGROUP_INET4_POST_BIND:
1956         case BPF_CGROUP_INET6_POST_BIND:
1957                 ptype = BPF_PROG_TYPE_CGROUP_SOCK;
1958                 break;
1959         case BPF_CGROUP_INET4_BIND:
1960         case BPF_CGROUP_INET6_BIND:
1961         case BPF_CGROUP_INET4_CONNECT:
1962         case BPF_CGROUP_INET6_CONNECT:
1963         case BPF_CGROUP_UDP4_SENDMSG:
1964         case BPF_CGROUP_UDP6_SENDMSG:
1965                 ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
1966                 break;
1967         case BPF_CGROUP_SOCK_OPS:
1968                 ptype = BPF_PROG_TYPE_SOCK_OPS;
1969                 break;
1970         case BPF_CGROUP_DEVICE:
1971                 ptype = BPF_PROG_TYPE_CGROUP_DEVICE;
1972                 break;
1973         case BPF_SK_MSG_VERDICT:
1974                 return sock_map_get_from_fd(attr, NULL);
1975         case BPF_SK_SKB_STREAM_PARSER:
1976         case BPF_SK_SKB_STREAM_VERDICT:
1977                 return sock_map_get_from_fd(attr, NULL);
1978         case BPF_LIRC_MODE2:
1979                 return lirc_prog_detach(attr);
1980         case BPF_FLOW_DISSECTOR:
1981                 return skb_flow_dissector_bpf_prog_detach(attr);
1982         case BPF_CGROUP_SYSCTL:
1983                 ptype = BPF_PROG_TYPE_CGROUP_SYSCTL;
1984                 break;
1985         default:
1986                 return -EINVAL;
1987         }
1988
1989         return cgroup_bpf_prog_detach(attr, ptype);
1990 }
1991
1992 #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
1993
1994 static int bpf_prog_query(const union bpf_attr *attr,
1995                           union bpf_attr __user *uattr)
1996 {
1997         if (!capable(CAP_NET_ADMIN))
1998                 return -EPERM;
1999         if (CHECK_ATTR(BPF_PROG_QUERY))
2000                 return -EINVAL;
2001         if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
2002                 return -EINVAL;
2003
2004         switch (attr->query.attach_type) {
2005         case BPF_CGROUP_INET_INGRESS:
2006         case BPF_CGROUP_INET_EGRESS:
2007         case BPF_CGROUP_INET_SOCK_CREATE:
2008         case BPF_CGROUP_INET4_BIND:
2009         case BPF_CGROUP_INET6_BIND:
2010         case BPF_CGROUP_INET4_POST_BIND:
2011         case BPF_CGROUP_INET6_POST_BIND:
2012         case BPF_CGROUP_INET4_CONNECT:
2013         case BPF_CGROUP_INET6_CONNECT:
2014         case BPF_CGROUP_UDP4_SENDMSG:
2015         case BPF_CGROUP_UDP6_SENDMSG:
2016         case BPF_CGROUP_SOCK_OPS:
2017         case BPF_CGROUP_DEVICE:
2018         case BPF_CGROUP_SYSCTL:
2019                 break;
2020         case BPF_LIRC_MODE2:
2021                 return lirc_prog_query(attr, uattr);
2022         case BPF_FLOW_DISSECTOR:
2023                 return skb_flow_dissector_prog_query(attr, uattr);
2024         default:
2025                 return -EINVAL;
2026         }
2027
2028         return cgroup_bpf_prog_query(attr, uattr);
2029 }
2030
2031 #define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out
2032
2033 static int bpf_prog_test_run(const union bpf_attr *attr,
2034                              union bpf_attr __user *uattr)
2035 {
2036         struct bpf_prog *prog;
2037         int ret = -ENOTSUPP;
2038
2039         if (!capable(CAP_SYS_ADMIN))
2040                 return -EPERM;
2041         if (CHECK_ATTR(BPF_PROG_TEST_RUN))
2042                 return -EINVAL;
2043
2044         if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
2045             (!attr->test.ctx_size_in && attr->test.ctx_in))
2046                 return -EINVAL;
2047
2048         if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
2049             (!attr->test.ctx_size_out && attr->test.ctx_out))
2050                 return -EINVAL;
2051
2052         prog = bpf_prog_get(attr->test.prog_fd);
2053         if (IS_ERR(prog))
2054                 return PTR_ERR(prog);
2055
2056         if (prog->aux->ops->test_run)
2057                 ret = prog->aux->ops->test_run(prog, attr, uattr);
2058
2059         bpf_prog_put(prog);
2060         return ret;
2061 }
2062
2063 #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
2064
2065 static int bpf_obj_get_next_id(const union bpf_attr *attr,
2066                                union bpf_attr __user *uattr,
2067                                struct idr *idr,
2068                                spinlock_t *lock)
2069 {
2070         u32 next_id = attr->start_id;
2071         int err = 0;
2072
2073         if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
2074                 return -EINVAL;
2075
2076         if (!capable(CAP_SYS_ADMIN))
2077                 return -EPERM;
2078
2079         next_id++;
2080         spin_lock_bh(lock);
2081         if (!idr_get_next(idr, &next_id))
2082                 err = -ENOENT;
2083         spin_unlock_bh(lock);
2084
2085         if (!err)
2086                 err = put_user(next_id, &uattr->next_id);
2087
2088         return err;
2089 }
2090
2091 #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
2092
2093 static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
2094 {
2095         struct bpf_prog *prog;
2096         u32 id = attr->prog_id;
2097         int fd;
2098
2099         if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
2100                 return -EINVAL;
2101
2102         if (!capable(CAP_SYS_ADMIN))
2103                 return -EPERM;
2104
2105         spin_lock_bh(&prog_idr_lock);
2106         prog = idr_find(&prog_idr, id);
2107         if (prog)
2108                 prog = bpf_prog_inc_not_zero(prog);
2109         else
2110                 prog = ERR_PTR(-ENOENT);
2111         spin_unlock_bh(&prog_idr_lock);
2112
2113         if (IS_ERR(prog))
2114                 return PTR_ERR(prog);
2115
2116         fd = bpf_prog_new_fd(prog);
2117         if (fd < 0)
2118                 bpf_prog_put(prog);
2119
2120         return fd;
2121 }
2122
2123 #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
2124
2125 static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
2126 {
2127         struct bpf_map *map;
2128         u32 id = attr->map_id;
2129         int f_flags;
2130         int fd;
2131
2132         if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
2133             attr->open_flags & ~BPF_OBJ_FLAG_MASK)
2134                 return -EINVAL;
2135
2136         if (!capable(CAP_SYS_ADMIN))
2137                 return -EPERM;
2138
2139         f_flags = bpf_get_file_flag(attr->open_flags);
2140         if (f_flags < 0)
2141                 return f_flags;
2142
2143         spin_lock_bh(&map_idr_lock);
2144         map = idr_find(&map_idr, id);
2145         if (map)
2146                 map = bpf_map_inc_not_zero(map, true);
2147         else
2148                 map = ERR_PTR(-ENOENT);
2149         spin_unlock_bh(&map_idr_lock);
2150
2151         if (IS_ERR(map))
2152                 return PTR_ERR(map);
2153
2154         fd = bpf_map_new_fd(map, f_flags);
2155         if (fd < 0)
2156                 bpf_map_put_with_uref(map);
2157
2158         return fd;
2159 }
2160
2161 static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
2162                                               unsigned long addr, u32 *off,
2163                                               u32 *type)
2164 {
2165         const struct bpf_map *map;
2166         int i;
2167
2168         for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
2169                 map = prog->aux->used_maps[i];
2170                 if (map == (void *)addr) {
2171                         *type = BPF_PSEUDO_MAP_FD;
2172                         return map;
2173                 }
2174                 if (!map->ops->map_direct_value_meta)
2175                         continue;
2176                 if (!map->ops->map_direct_value_meta(map, addr, off)) {
2177                         *type = BPF_PSEUDO_MAP_VALUE;
2178                         return map;
2179                 }
2180         }
2181
2182         return NULL;
2183 }
2184
2185 static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog)
2186 {
2187         const struct bpf_map *map;
2188         struct bpf_insn *insns;
2189         u32 off, type;
2190         u64 imm;
2191         int i;
2192
2193         insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
2194                         GFP_USER);
2195         if (!insns)
2196                 return insns;
2197
2198         for (i = 0; i < prog->len; i++) {
2199                 if (insns[i].code == (BPF_JMP | BPF_TAIL_CALL)) {
2200                         insns[i].code = BPF_JMP | BPF_CALL;
2201                         insns[i].imm = BPF_FUNC_tail_call;
2202                         /* fall-through */
2203                 }
2204                 if (insns[i].code == (BPF_JMP | BPF_CALL) ||
2205                     insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) {
2206                         if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS))
2207                                 insns[i].code = BPF_JMP | BPF_CALL;
2208                         if (!bpf_dump_raw_ok())
2209                                 insns[i].imm = 0;
2210                         continue;
2211                 }
2212
2213                 if (insns[i].code != (BPF_LD | BPF_IMM | BPF_DW))
2214                         continue;
2215
2216                 imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
2217                 map = bpf_map_from_imm(prog, imm, &off, &type);
2218                 if (map) {
2219                         insns[i].src_reg = type;
2220                         insns[i].imm = map->id;
2221                         insns[i + 1].imm = off;
2222                         continue;
2223                 }
2224         }
2225
2226         return insns;
2227 }
2228
2229 static int set_info_rec_size(struct bpf_prog_info *info)
2230 {
2231         /*
2232          * Ensure info.*_rec_size is the same as kernel expected size
2233          *
2234          * or
2235          *
2236          * Only allow zero *_rec_size if both _rec_size and _cnt are
2237          * zero.  In this case, the kernel will set the expected
2238          * _rec_size back to the info.
2239          */
2240
2241         if ((info->nr_func_info || info->func_info_rec_size) &&
2242             info->func_info_rec_size != sizeof(struct bpf_func_info))
2243                 return -EINVAL;
2244
2245         if ((info->nr_line_info || info->line_info_rec_size) &&
2246             info->line_info_rec_size != sizeof(struct bpf_line_info))
2247                 return -EINVAL;
2248
2249         if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
2250             info->jited_line_info_rec_size != sizeof(__u64))
2251                 return -EINVAL;
2252
2253         info->func_info_rec_size = sizeof(struct bpf_func_info);
2254         info->line_info_rec_size = sizeof(struct bpf_line_info);
2255         info->jited_line_info_rec_size = sizeof(__u64);
2256
2257         return 0;
2258 }
2259
2260 static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
2261                                    const union bpf_attr *attr,
2262                                    union bpf_attr __user *uattr)
2263 {
2264         struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2265         struct bpf_prog_info info = {};
2266         u32 info_len = attr->info.info_len;
2267         struct bpf_prog_stats stats;
2268         char __user *uinsns;
2269         u32 ulen;
2270         int err;
2271
2272         err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
2273         if (err)
2274                 return err;
2275         info_len = min_t(u32, sizeof(info), info_len);
2276
2277         if (copy_from_user(&info, uinfo, info_len))
2278                 return -EFAULT;
2279
2280         info.type = prog->type;
2281         info.id = prog->aux->id;
2282         info.load_time = prog->aux->load_time;
2283         info.created_by_uid = from_kuid_munged(current_user_ns(),
2284                                                prog->aux->user->uid);
2285         info.gpl_compatible = prog->gpl_compatible;
2286
2287         memcpy(info.tag, prog->tag, sizeof(prog->tag));
2288         memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
2289
2290         ulen = info.nr_map_ids;
2291         info.nr_map_ids = prog->aux->used_map_cnt;
2292         ulen = min_t(u32, info.nr_map_ids, ulen);
2293         if (ulen) {
2294                 u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
2295                 u32 i;
2296
2297                 for (i = 0; i < ulen; i++)
2298                         if (put_user(prog->aux->used_maps[i]->id,
2299                                      &user_map_ids[i]))
2300                                 return -EFAULT;
2301         }
2302
2303         err = set_info_rec_size(&info);
2304         if (err)
2305                 return err;
2306
2307         bpf_prog_get_stats(prog, &stats);
2308         info.run_time_ns = stats.nsecs;
2309         info.run_cnt = stats.cnt;
2310
2311         if (!capable(CAP_SYS_ADMIN)) {
2312                 info.jited_prog_len = 0;
2313                 info.xlated_prog_len = 0;
2314                 info.nr_jited_ksyms = 0;
2315                 info.nr_jited_func_lens = 0;
2316                 info.nr_func_info = 0;
2317                 info.nr_line_info = 0;
2318                 info.nr_jited_line_info = 0;
2319                 goto done;
2320         }
2321
2322         ulen = info.xlated_prog_len;
2323         info.xlated_prog_len = bpf_prog_insn_size(prog);
2324         if (info.xlated_prog_len && ulen) {
2325                 struct bpf_insn *insns_sanitized;
2326                 bool fault;
2327
2328                 if (prog->blinded && !bpf_dump_raw_ok()) {
2329                         info.xlated_prog_insns = 0;
2330                         goto done;
2331                 }
2332                 insns_sanitized = bpf_insn_prepare_dump(prog);
2333                 if (!insns_sanitized)
2334                         return -ENOMEM;
2335                 uinsns = u64_to_user_ptr(info.xlated_prog_insns);
2336                 ulen = min_t(u32, info.xlated_prog_len, ulen);
2337                 fault = copy_to_user(uinsns, insns_sanitized, ulen);
2338                 kfree(insns_sanitized);
2339                 if (fault)
2340                         return -EFAULT;
2341         }
2342
2343         if (bpf_prog_is_dev_bound(prog->aux)) {
2344                 err = bpf_prog_offload_info_fill(&info, prog);
2345                 if (err)
2346                         return err;
2347                 goto done;
2348         }
2349
2350         /* NOTE: the following code is supposed to be skipped for offload.
2351          * bpf_prog_offload_info_fill() is the place to fill similar fields
2352          * for offload.
2353          */
2354         ulen = info.jited_prog_len;
2355         if (prog->aux->func_cnt) {
2356                 u32 i;
2357
2358                 info.jited_prog_len = 0;
2359                 for (i = 0; i < prog->aux->func_cnt; i++)
2360                         info.jited_prog_len += prog->aux->func[i]->jited_len;
2361         } else {
2362                 info.jited_prog_len = prog->jited_len;
2363         }
2364
2365         if (info.jited_prog_len && ulen) {
2366                 if (bpf_dump_raw_ok()) {
2367                         uinsns = u64_to_user_ptr(info.jited_prog_insns);
2368                         ulen = min_t(u32, info.jited_prog_len, ulen);
2369
2370                         /* for multi-function programs, copy the JITed
2371                          * instructions for all the functions
2372                          */
2373                         if (prog->aux->func_cnt) {
2374                                 u32 len, free, i;
2375                                 u8 *img;
2376
2377                                 free = ulen;
2378                                 for (i = 0; i < prog->aux->func_cnt; i++) {
2379                                         len = prog->aux->func[i]->jited_len;
2380                                         len = min_t(u32, len, free);
2381                                         img = (u8 *) prog->aux->func[i]->bpf_func;
2382                                         if (copy_to_user(uinsns, img, len))
2383                                                 return -EFAULT;
2384                                         uinsns += len;
2385                                         free -= len;
2386                                         if (!free)
2387                                                 break;
2388                                 }
2389                         } else {
2390                                 if (copy_to_user(uinsns, prog->bpf_func, ulen))
2391                                         return -EFAULT;
2392                         }
2393                 } else {
2394                         info.jited_prog_insns = 0;
2395                 }
2396         }
2397
2398         ulen = info.nr_jited_ksyms;
2399         info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
2400         if (ulen) {
2401                 if (bpf_dump_raw_ok()) {
2402                         unsigned long ksym_addr;
2403                         u64 __user *user_ksyms;
2404                         u32 i;
2405
2406                         /* copy the address of the kernel symbol
2407                          * corresponding to each function
2408                          */
2409                         ulen = min_t(u32, info.nr_jited_ksyms, ulen);
2410                         user_ksyms = u64_to_user_ptr(info.jited_ksyms);
2411                         if (prog->aux->func_cnt) {
2412                                 for (i = 0; i < ulen; i++) {
2413                                         ksym_addr = (unsigned long)
2414                                                 prog->aux->func[i]->bpf_func;
2415                                         if (put_user((u64) ksym_addr,
2416                                                      &user_ksyms[i]))
2417                                                 return -EFAULT;
2418                                 }
2419                         } else {
2420                                 ksym_addr = (unsigned long) prog->bpf_func;
2421                                 if (put_user((u64) ksym_addr, &user_ksyms[0]))
2422                                         return -EFAULT;
2423                         }
2424                 } else {
2425                         info.jited_ksyms = 0;
2426                 }
2427         }
2428
2429         ulen = info.nr_jited_func_lens;
2430         info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
2431         if (ulen) {
2432                 if (bpf_dump_raw_ok()) {
2433                         u32 __user *user_lens;
2434                         u32 func_len, i;
2435
2436                         /* copy the JITed image lengths for each function */
2437                         ulen = min_t(u32, info.nr_jited_func_lens, ulen);
2438                         user_lens = u64_to_user_ptr(info.jited_func_lens);
2439                         if (prog->aux->func_cnt) {
2440                                 for (i = 0; i < ulen; i++) {
2441                                         func_len =
2442                                                 prog->aux->func[i]->jited_len;
2443                                         if (put_user(func_len, &user_lens[i]))
2444                                                 return -EFAULT;
2445                                 }
2446                         } else {
2447                                 func_len = prog->jited_len;
2448                                 if (put_user(func_len, &user_lens[0]))
2449                                         return -EFAULT;
2450                         }
2451                 } else {
2452                         info.jited_func_lens = 0;
2453                 }
2454         }
2455
2456         if (prog->aux->btf)
2457                 info.btf_id = btf_id(prog->aux->btf);
2458
2459         ulen = info.nr_func_info;
2460         info.nr_func_info = prog->aux->func_info_cnt;
2461         if (info.nr_func_info && ulen) {
2462                 char __user *user_finfo;
2463
2464                 user_finfo = u64_to_user_ptr(info.func_info);
2465                 ulen = min_t(u32, info.nr_func_info, ulen);
2466                 if (copy_to_user(user_finfo, prog->aux->func_info,
2467                                  info.func_info_rec_size * ulen))
2468                         return -EFAULT;
2469         }
2470
2471         ulen = info.nr_line_info;
2472         info.nr_line_info = prog->aux->nr_linfo;
2473         if (info.nr_line_info && ulen) {
2474                 __u8 __user *user_linfo;
2475
2476                 user_linfo = u64_to_user_ptr(info.line_info);
2477                 ulen = min_t(u32, info.nr_line_info, ulen);
2478                 if (copy_to_user(user_linfo, prog->aux->linfo,
2479                                  info.line_info_rec_size * ulen))
2480                         return -EFAULT;
2481         }
2482
2483         ulen = info.nr_jited_line_info;
2484         if (prog->aux->jited_linfo)
2485                 info.nr_jited_line_info = prog->aux->nr_linfo;
2486         else
2487                 info.nr_jited_line_info = 0;
2488         if (info.nr_jited_line_info && ulen) {
2489                 if (bpf_dump_raw_ok()) {
2490                         __u64 __user *user_linfo;
2491                         u32 i;
2492
2493                         user_linfo = u64_to_user_ptr(info.jited_line_info);
2494                         ulen = min_t(u32, info.nr_jited_line_info, ulen);
2495                         for (i = 0; i < ulen; i++) {
2496                                 if (put_user((__u64)(long)prog->aux->jited_linfo[i],
2497                                              &user_linfo[i]))
2498                                         return -EFAULT;
2499                         }
2500                 } else {
2501                         info.jited_line_info = 0;
2502                 }
2503         }
2504
2505         ulen = info.nr_prog_tags;
2506         info.nr_prog_tags = prog->aux->func_cnt ? : 1;
2507         if (ulen) {
2508                 __u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
2509                 u32 i;
2510
2511                 user_prog_tags = u64_to_user_ptr(info.prog_tags);
2512                 ulen = min_t(u32, info.nr_prog_tags, ulen);
2513                 if (prog->aux->func_cnt) {
2514                         for (i = 0; i < ulen; i++) {
2515                                 if (copy_to_user(user_prog_tags[i],
2516                                                  prog->aux->func[i]->tag,
2517                                                  BPF_TAG_SIZE))
2518                                         return -EFAULT;
2519                         }
2520                 } else {
2521                         if (copy_to_user(user_prog_tags[0],
2522                                          prog->tag, BPF_TAG_SIZE))
2523                                 return -EFAULT;
2524                 }
2525         }
2526
2527 done:
2528         if (copy_to_user(uinfo, &info, info_len) ||
2529             put_user(info_len, &uattr->info.info_len))
2530                 return -EFAULT;
2531
2532         return 0;
2533 }
2534
2535 static int bpf_map_get_info_by_fd(struct bpf_map *map,
2536                                   const union bpf_attr *attr,
2537                                   union bpf_attr __user *uattr)
2538 {
2539         struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2540         struct bpf_map_info info = {};
2541         u32 info_len = attr->info.info_len;
2542         int err;
2543
2544         err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
2545         if (err)
2546                 return err;
2547         info_len = min_t(u32, sizeof(info), info_len);
2548
2549         info.type = map->map_type;
2550         info.id = map->id;
2551         info.key_size = map->key_size;
2552         info.value_size = map->value_size;
2553         info.max_entries = map->max_entries;
2554         info.map_flags = map->map_flags;
2555         memcpy(info.name, map->name, sizeof(map->name));
2556
2557         if (map->btf) {
2558                 info.btf_id = btf_id(map->btf);
2559                 info.btf_key_type_id = map->btf_key_type_id;
2560                 info.btf_value_type_id = map->btf_value_type_id;
2561         }
2562
2563         if (bpf_map_is_dev_bound(map)) {
2564                 err = bpf_map_offload_info_fill(&info, map);
2565                 if (err)
2566                         return err;
2567         }
2568
2569         if (copy_to_user(uinfo, &info, info_len) ||
2570             put_user(info_len, &uattr->info.info_len))
2571                 return -EFAULT;
2572
2573         return 0;
2574 }
2575
2576 static int bpf_btf_get_info_by_fd(struct btf *btf,
2577                                   const union bpf_attr *attr,
2578                                   union bpf_attr __user *uattr)
2579 {
2580         struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2581         u32 info_len = attr->info.info_len;
2582         int err;
2583
2584         err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len);
2585         if (err)
2586                 return err;
2587
2588         return btf_get_info_by_fd(btf, attr, uattr);
2589 }
2590
2591 #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
2592
2593 static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
2594                                   union bpf_attr __user *uattr)
2595 {
2596         int ufd = attr->info.bpf_fd;
2597         struct fd f;
2598         int err;
2599
2600         if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
2601                 return -EINVAL;
2602
2603         f = fdget(ufd);
2604         if (!f.file)
2605                 return -EBADFD;
2606
2607         if (f.file->f_op == &bpf_prog_fops)
2608                 err = bpf_prog_get_info_by_fd(f.file->private_data, attr,
2609                                               uattr);
2610         else if (f.file->f_op == &bpf_map_fops)
2611                 err = bpf_map_get_info_by_fd(f.file->private_data, attr,
2612                                              uattr);
2613         else if (f.file->f_op == &btf_fops)
2614                 err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr);
2615         else
2616                 err = -EINVAL;
2617
2618         fdput(f);
2619         return err;
2620 }
2621
2622 #define BPF_BTF_LOAD_LAST_FIELD btf_log_level
2623
2624 static int bpf_btf_load(const union bpf_attr *attr)
2625 {
2626         if (CHECK_ATTR(BPF_BTF_LOAD))
2627                 return -EINVAL;
2628
2629         if (!capable(CAP_SYS_ADMIN))
2630                 return -EPERM;
2631
2632         return btf_new_fd(attr);
2633 }
2634
2635 #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
2636
2637 static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
2638 {
2639         if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
2640                 return -EINVAL;
2641
2642         if (!capable(CAP_SYS_ADMIN))
2643                 return -EPERM;
2644
2645         return btf_get_fd_by_id(attr->btf_id);
2646 }
2647
2648 static int bpf_task_fd_query_copy(const union bpf_attr *attr,
2649                                     union bpf_attr __user *uattr,
2650                                     u32 prog_id, u32 fd_type,
2651                                     const char *buf, u64 probe_offset,
2652                                     u64 probe_addr)
2653 {
2654         char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
2655         u32 len = buf ? strlen(buf) : 0, input_len;
2656         int err = 0;
2657
2658         if (put_user(len, &uattr->task_fd_query.buf_len))
2659                 return -EFAULT;
2660         input_len = attr->task_fd_query.buf_len;
2661         if (input_len && ubuf) {
2662                 if (!len) {
2663                         /* nothing to copy, just make ubuf NULL terminated */
2664                         char zero = '\0';
2665
2666                         if (put_user(zero, ubuf))
2667                                 return -EFAULT;
2668                 } else if (input_len >= len + 1) {
2669                         /* ubuf can hold the string with NULL terminator */
2670                         if (copy_to_user(ubuf, buf, len + 1))
2671                                 return -EFAULT;
2672                 } else {
2673                         /* ubuf cannot hold the string with NULL terminator,
2674                          * do a partial copy with NULL terminator.
2675                          */
2676                         char zero = '\0';
2677
2678                         err = -ENOSPC;
2679                         if (copy_to_user(ubuf, buf, input_len - 1))
2680                                 return -EFAULT;
2681                         if (put_user(zero, ubuf + input_len - 1))
2682                                 return -EFAULT;
2683                 }
2684         }
2685
2686         if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
2687             put_user(fd_type, &uattr->task_fd_query.fd_type) ||
2688             put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
2689             put_user(probe_addr, &uattr->task_fd_query.probe_addr))
2690                 return -EFAULT;
2691
2692         return err;
2693 }
2694
2695 #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
2696
2697 static int bpf_task_fd_query(const union bpf_attr *attr,
2698                              union bpf_attr __user *uattr)
2699 {
2700         pid_t pid = attr->task_fd_query.pid;
2701         u32 fd = attr->task_fd_query.fd;
2702         const struct perf_event *event;
2703         struct files_struct *files;
2704         struct task_struct *task;
2705         struct file *file;
2706         int err;
2707
2708         if (CHECK_ATTR(BPF_TASK_FD_QUERY))
2709                 return -EINVAL;
2710
2711         if (!capable(CAP_SYS_ADMIN))
2712                 return -EPERM;
2713
2714         if (attr->task_fd_query.flags != 0)
2715                 return -EINVAL;
2716
2717         task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
2718         if (!task)
2719                 return -ENOENT;
2720
2721         files = get_files_struct(task);
2722         put_task_struct(task);
2723         if (!files)
2724                 return -ENOENT;
2725
2726         err = 0;
2727         spin_lock(&files->file_lock);
2728         file = fcheck_files(files, fd);
2729         if (!file)
2730                 err = -EBADF;
2731         else
2732                 get_file(file);
2733         spin_unlock(&files->file_lock);
2734         put_files_struct(files);
2735
2736         if (err)
2737                 goto out;
2738
2739         if (file->f_op == &bpf_raw_tp_fops) {
2740                 struct bpf_raw_tracepoint *raw_tp = file->private_data;
2741                 struct bpf_raw_event_map *btp = raw_tp->btp;
2742
2743                 err = bpf_task_fd_query_copy(attr, uattr,
2744                                              raw_tp->prog->aux->id,
2745                                              BPF_FD_TYPE_RAW_TRACEPOINT,
2746                                              btp->tp->name, 0, 0);
2747                 goto put_file;
2748         }
2749
2750         event = perf_get_event(file);
2751         if (!IS_ERR(event)) {
2752                 u64 probe_offset, probe_addr;
2753                 u32 prog_id, fd_type;
2754                 const char *buf;
2755
2756                 err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
2757                                               &buf, &probe_offset,
2758                                               &probe_addr);
2759                 if (!err)
2760                         err = bpf_task_fd_query_copy(attr, uattr, prog_id,
2761                                                      fd_type, buf,
2762                                                      probe_offset,
2763                                                      probe_addr);
2764                 goto put_file;
2765         }
2766
2767         err = -ENOTSUPP;
2768 put_file:
2769         fput(file);
2770 out:
2771         return err;
2772 }
2773
2774 SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
2775 {
2776         union bpf_attr attr = {};
2777         int err;
2778
2779         if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN))
2780                 return -EPERM;
2781
2782         err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
2783         if (err)
2784                 return err;
2785         size = min_t(u32, size, sizeof(attr));
2786
2787         /* copy attributes from user space, may be less than sizeof(bpf_attr) */
2788         if (copy_from_user(&attr, uattr, size) != 0)
2789                 return -EFAULT;
2790
2791         err = security_bpf(cmd, &attr, size);
2792         if (err < 0)
2793                 return err;
2794
2795         switch (cmd) {
2796         case BPF_MAP_CREATE:
2797                 err = map_create(&attr);
2798                 break;
2799         case BPF_MAP_LOOKUP_ELEM:
2800                 err = map_lookup_elem(&attr);
2801                 break;
2802         case BPF_MAP_UPDATE_ELEM:
2803                 err = map_update_elem(&attr);
2804                 break;
2805         case BPF_MAP_DELETE_ELEM:
2806                 err = map_delete_elem(&attr);
2807                 break;
2808         case BPF_MAP_GET_NEXT_KEY:
2809                 err = map_get_next_key(&attr);
2810                 break;
2811         case BPF_MAP_FREEZE:
2812                 err = map_freeze(&attr);
2813                 break;
2814         case BPF_PROG_LOAD:
2815                 err = bpf_prog_load(&attr, uattr);
2816                 break;
2817         case BPF_OBJ_PIN:
2818                 err = bpf_obj_pin(&attr);
2819                 break;
2820         case BPF_OBJ_GET:
2821                 err = bpf_obj_get(&attr);
2822                 break;
2823         case BPF_PROG_ATTACH:
2824                 err = bpf_prog_attach(&attr);
2825                 break;
2826         case BPF_PROG_DETACH:
2827                 err = bpf_prog_detach(&attr);
2828                 break;
2829         case BPF_PROG_QUERY:
2830                 err = bpf_prog_query(&attr, uattr);
2831                 break;
2832         case BPF_PROG_TEST_RUN:
2833                 err = bpf_prog_test_run(&attr, uattr);
2834                 break;
2835         case BPF_PROG_GET_NEXT_ID:
2836                 err = bpf_obj_get_next_id(&attr, uattr,
2837                                           &prog_idr, &prog_idr_lock);
2838                 break;
2839         case BPF_MAP_GET_NEXT_ID:
2840                 err = bpf_obj_get_next_id(&attr, uattr,
2841                                           &map_idr, &map_idr_lock);
2842                 break;
2843         case BPF_PROG_GET_FD_BY_ID:
2844                 err = bpf_prog_get_fd_by_id(&attr);
2845                 break;
2846         case BPF_MAP_GET_FD_BY_ID:
2847                 err = bpf_map_get_fd_by_id(&attr);
2848                 break;
2849         case BPF_OBJ_GET_INFO_BY_FD:
2850                 err = bpf_obj_get_info_by_fd(&attr, uattr);
2851                 break;
2852         case BPF_RAW_TRACEPOINT_OPEN:
2853                 err = bpf_raw_tracepoint_open(&attr);
2854                 break;
2855         case BPF_BTF_LOAD:
2856                 err = bpf_btf_load(&attr);
2857                 break;
2858         case BPF_BTF_GET_FD_BY_ID:
2859                 err = bpf_btf_get_fd_by_id(&attr);
2860                 break;
2861         case BPF_TASK_FD_QUERY:
2862                 err = bpf_task_fd_query(&attr, uattr);
2863                 break;
2864         case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
2865                 err = map_lookup_and_delete_elem(&attr);
2866                 break;
2867         default:
2868                 err = -EINVAL;
2869                 break;
2870         }
2871
2872         return err;
2873 }