1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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.
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.
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>
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>
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))
42 #define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
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);
50 int sysctl_unprivileged_bpf_disabled __read_mostly;
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) \
56 #include <linux/bpf_types.h>
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.
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.
70 int bpf_check_uarg_tail_zero(void __user *uaddr,
74 unsigned char __user *addr;
75 unsigned char __user *end;
79 if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
82 if (unlikely(!access_ok(VERIFY_READ, uaddr, actual_size)))
85 if (actual_size <= expected_size)
88 addr = uaddr + expected_size;
89 end = uaddr + actual_size;
91 for (; addr < end; addr++) {
92 err = get_user(val, addr);
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,
108 static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
110 const struct bpf_map_ops *ops;
111 u32 type = attr->map_type;
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];
120 return ERR_PTR(-EINVAL);
122 if (ops->map_alloc_check) {
123 err = ops->map_alloc_check(attr);
127 if (attr->map_ifindex)
128 ops = &bpf_map_offload_ops;
129 map = ops->map_alloc(attr);
133 map->map_type = type;
137 void *bpf_map_area_alloc(size_t size, int numa_node)
139 /* We definitely need __GFP_NORETRY, so OOM killer doesn't
140 * trigger under memory pressure as we really just want to
143 const gfp_t flags = __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO;
146 if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
147 area = kmalloc_node(size, GFP_USER | flags, numa_node);
152 return __vmalloc_node_flags_caller(size, numa_node, GFP_KERNEL | flags,
153 __builtin_return_address(0));
156 void bpf_map_area_free(void *area)
161 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
163 map->map_type = attr->map_type;
164 map->key_size = attr->key_size;
165 map->value_size = attr->value_size;
166 map->max_entries = attr->max_entries;
167 map->map_flags = attr->map_flags;
168 map->numa_node = bpf_map_attr_numa_node(attr);
171 int bpf_map_precharge_memlock(u32 pages)
173 struct user_struct *user = get_current_user();
174 unsigned long memlock_limit, cur;
176 memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
177 cur = atomic_long_read(&user->locked_vm);
179 if (cur + pages > memlock_limit)
184 static int bpf_charge_memlock(struct user_struct *user, u32 pages)
186 unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
188 if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) {
189 atomic_long_sub(pages, &user->locked_vm);
195 static void bpf_uncharge_memlock(struct user_struct *user, u32 pages)
197 atomic_long_sub(pages, &user->locked_vm);
200 static int bpf_map_init_memlock(struct bpf_map *map)
202 struct user_struct *user = get_current_user();
205 ret = bpf_charge_memlock(user, map->pages);
214 static void bpf_map_release_memlock(struct bpf_map *map)
216 struct user_struct *user = map->user;
217 bpf_uncharge_memlock(user, map->pages);
221 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages)
225 ret = bpf_charge_memlock(map->user, pages);
232 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages)
234 bpf_uncharge_memlock(map->user, pages);
238 static int bpf_map_alloc_id(struct bpf_map *map)
242 idr_preload(GFP_KERNEL);
243 spin_lock_bh(&map_idr_lock);
244 id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
247 spin_unlock_bh(&map_idr_lock);
250 if (WARN_ON_ONCE(!id))
253 return id > 0 ? 0 : id;
256 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
260 /* Offloaded maps are removed from the IDR store when their device
261 * disappears - even if someone holds an fd to them they are unusable,
262 * the memory is gone, all ops will fail; they are simply waiting for
263 * refcnt to drop to be freed.
269 spin_lock_irqsave(&map_idr_lock, flags);
271 __acquire(&map_idr_lock);
273 idr_remove(&map_idr, map->id);
277 spin_unlock_irqrestore(&map_idr_lock, flags);
279 __release(&map_idr_lock);
282 /* called from workqueue */
283 static void bpf_map_free_deferred(struct work_struct *work)
285 struct bpf_map *map = container_of(work, struct bpf_map, work);
287 bpf_map_release_memlock(map);
288 security_bpf_map_free(map);
289 /* implementation dependent freeing */
290 map->ops->map_free(map);
293 static void bpf_map_put_uref(struct bpf_map *map)
295 if (atomic_dec_and_test(&map->usercnt)) {
296 if (map->ops->map_release_uref)
297 map->ops->map_release_uref(map);
301 /* decrement map refcnt and schedule it for freeing via workqueue
302 * (unrelying map implementation ops->map_free() might sleep)
304 static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
306 if (atomic_dec_and_test(&map->refcnt)) {
307 /* bpf_map_free_id() must be called first */
308 bpf_map_free_id(map, do_idr_lock);
310 INIT_WORK(&map->work, bpf_map_free_deferred);
311 schedule_work(&map->work);
315 void bpf_map_put(struct bpf_map *map)
317 __bpf_map_put(map, true);
319 EXPORT_SYMBOL_GPL(bpf_map_put);
321 void bpf_map_put_with_uref(struct bpf_map *map)
323 bpf_map_put_uref(map);
327 static int bpf_map_release(struct inode *inode, struct file *filp)
329 struct bpf_map *map = filp->private_data;
331 if (map->ops->map_release)
332 map->ops->map_release(map, filp);
334 bpf_map_put_with_uref(map);
338 #ifdef CONFIG_PROC_FS
339 static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
341 const struct bpf_map *map = filp->private_data;
342 const struct bpf_array *array;
343 u32 owner_prog_type = 0;
346 if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
347 array = container_of(map, struct bpf_array, map);
348 owner_prog_type = array->owner_prog_type;
349 owner_jited = array->owner_jited;
365 map->pages * 1ULL << PAGE_SHIFT,
368 if (owner_prog_type) {
369 seq_printf(m, "owner_prog_type:\t%u\n",
371 seq_printf(m, "owner_jited:\t%u\n",
377 static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
380 /* We need this handler such that alloc_file() enables
381 * f_mode with FMODE_CAN_READ.
386 static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
387 size_t siz, loff_t *ppos)
389 /* We need this handler such that alloc_file() enables
390 * f_mode with FMODE_CAN_WRITE.
395 const struct file_operations bpf_map_fops = {
396 #ifdef CONFIG_PROC_FS
397 .show_fdinfo = bpf_map_show_fdinfo,
399 .release = bpf_map_release,
400 .read = bpf_dummy_read,
401 .write = bpf_dummy_write,
404 int bpf_map_new_fd(struct bpf_map *map, int flags)
408 ret = security_bpf_map(map, OPEN_FMODE(flags));
412 return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
416 int bpf_get_file_flag(int flags)
418 if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
420 if (flags & BPF_F_RDONLY)
422 if (flags & BPF_F_WRONLY)
427 /* helper macro to check that unused fields 'union bpf_attr' are zero */
428 #define CHECK_ATTR(CMD) \
429 memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
430 sizeof(attr->CMD##_LAST_FIELD), 0, \
432 offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
433 sizeof(attr->CMD##_LAST_FIELD)) != NULL
435 /* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes.
436 * Return 0 on success and < 0 on error.
438 static int bpf_obj_name_cpy(char *dst, const char *src)
440 const char *end = src + BPF_OBJ_NAME_LEN;
442 memset(dst, 0, BPF_OBJ_NAME_LEN);
444 /* Copy all isalnum() and '_' char */
445 while (src < end && *src) {
446 if (!isalnum(*src) && *src != '_')
451 /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */
458 int map_check_no_btf(const struct bpf_map *map,
459 const struct btf_type *key_type,
460 const struct btf_type *value_type)
465 static int map_check_btf(const struct bpf_map *map, const struct btf *btf,
466 u32 btf_key_id, u32 btf_value_id)
468 const struct btf_type *key_type, *value_type;
469 u32 key_size, value_size;
472 key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
473 if (!key_type || key_size != map->key_size)
476 value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
477 if (!value_type || value_size != map->value_size)
480 if (map->ops->map_check_btf)
481 ret = map->ops->map_check_btf(map, key_type, value_type);
486 #define BPF_MAP_CREATE_LAST_FIELD btf_value_type_id
487 /* called via syscall */
488 static int map_create(union bpf_attr *attr)
490 int numa_node = bpf_map_attr_numa_node(attr);
495 err = CHECK_ATTR(BPF_MAP_CREATE);
499 f_flags = bpf_get_file_flag(attr->map_flags);
503 if (numa_node != NUMA_NO_NODE &&
504 ((unsigned int)numa_node >= nr_node_ids ||
505 !node_online(numa_node)))
508 /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
509 map = find_and_alloc_map(attr);
513 err = bpf_obj_name_cpy(map->name, attr->map_name);
515 goto free_map_nouncharge;
517 atomic_set(&map->refcnt, 1);
518 atomic_set(&map->usercnt, 1);
520 if (attr->btf_key_type_id || attr->btf_value_type_id) {
523 if (!attr->btf_key_type_id || !attr->btf_value_type_id) {
525 goto free_map_nouncharge;
528 btf = btf_get_by_fd(attr->btf_fd);
531 goto free_map_nouncharge;
534 err = map_check_btf(map, btf, attr->btf_key_type_id,
535 attr->btf_value_type_id);
538 goto free_map_nouncharge;
542 map->btf_key_type_id = attr->btf_key_type_id;
543 map->btf_value_type_id = attr->btf_value_type_id;
546 err = security_bpf_map_alloc(map);
548 goto free_map_nouncharge;
550 err = bpf_map_init_memlock(map);
554 err = bpf_map_alloc_id(map);
558 err = bpf_map_new_fd(map, f_flags);
560 /* failed to allocate fd.
561 * bpf_map_put() is needed because the above
562 * bpf_map_alloc_id() has published the map
563 * to the userspace and the userspace may
564 * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
573 bpf_map_release_memlock(map);
575 security_bpf_map_free(map);
578 map->ops->map_free(map);
582 /* if error is returned, fd is released.
583 * On success caller should complete fd access with matching fdput()
585 struct bpf_map *__bpf_map_get(struct fd f)
588 return ERR_PTR(-EBADF);
589 if (f.file->f_op != &bpf_map_fops) {
591 return ERR_PTR(-EINVAL);
594 return f.file->private_data;
597 /* prog's and map's refcnt limit */
598 #define BPF_MAX_REFCNT 32768
600 struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref)
602 if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) {
603 atomic_dec(&map->refcnt);
604 return ERR_PTR(-EBUSY);
607 atomic_inc(&map->usercnt);
610 EXPORT_SYMBOL_GPL(bpf_map_inc);
612 struct bpf_map *bpf_map_get_with_uref(u32 ufd)
614 struct fd f = fdget(ufd);
617 map = __bpf_map_get(f);
621 map = bpf_map_inc(map, true);
627 /* map_idr_lock should have been held */
628 static struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map,
633 refold = atomic_fetch_add_unless(&map->refcnt, 1, 0);
635 if (refold >= BPF_MAX_REFCNT) {
636 __bpf_map_put(map, false);
637 return ERR_PTR(-EBUSY);
641 return ERR_PTR(-ENOENT);
644 atomic_inc(&map->usercnt);
649 int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
654 /* last field in 'union bpf_attr' used by this command */
655 #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value
657 static int map_lookup_elem(union bpf_attr *attr)
659 void __user *ukey = u64_to_user_ptr(attr->key);
660 void __user *uvalue = u64_to_user_ptr(attr->value);
661 int ufd = attr->map_fd;
663 void *key, *value, *ptr;
668 if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
672 map = __bpf_map_get(f);
676 if (!(f.file->f_mode & FMODE_CAN_READ)) {
681 key = memdup_user(ukey, map->key_size);
687 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
688 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
689 map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
690 map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
691 value_size = round_up(map->value_size, 8) * num_possible_cpus();
692 else if (IS_FD_MAP(map))
693 value_size = sizeof(u32);
695 value_size = map->value_size;
698 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
702 if (bpf_map_is_dev_bound(map)) {
703 err = bpf_map_offload_lookup_elem(map, key, value);
704 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
705 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
706 err = bpf_percpu_hash_copy(map, key, value);
707 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
708 err = bpf_percpu_array_copy(map, key, value);
709 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
710 err = bpf_percpu_cgroup_storage_copy(map, key, value);
711 } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
712 err = bpf_stackmap_copy(map, key, value);
713 } else if (IS_FD_ARRAY(map)) {
714 err = bpf_fd_array_map_lookup_elem(map, key, value);
715 } else if (IS_FD_HASH(map)) {
716 err = bpf_fd_htab_map_lookup_elem(map, key, value);
717 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
718 err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
721 ptr = map->ops->map_lookup_elem(map, key);
728 memcpy(value, ptr, value_size);
737 if (copy_to_user(uvalue, value, value_size) != 0)
751 static void maybe_wait_bpf_programs(struct bpf_map *map)
753 /* Wait for any running BPF programs to complete so that
754 * userspace, when we return to it, knows that all programs
755 * that could be running use the new map value.
757 if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
758 map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
762 #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
764 static int map_update_elem(union bpf_attr *attr)
766 void __user *ukey = u64_to_user_ptr(attr->key);
767 void __user *uvalue = u64_to_user_ptr(attr->value);
768 int ufd = attr->map_fd;
775 if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
779 map = __bpf_map_get(f);
783 if (!(f.file->f_mode & FMODE_CAN_WRITE)) {
788 key = memdup_user(ukey, map->key_size);
794 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
795 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
796 map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
797 map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
798 value_size = round_up(map->value_size, 8) * num_possible_cpus();
800 value_size = map->value_size;
803 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
808 if (copy_from_user(value, uvalue, value_size) != 0)
811 /* Need to create a kthread, thus must support schedule */
812 if (bpf_map_is_dev_bound(map)) {
813 err = bpf_map_offload_update_elem(map, key, value, attr->flags);
815 } else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
816 map->map_type == BPF_MAP_TYPE_SOCKHASH ||
817 map->map_type == BPF_MAP_TYPE_SOCKMAP) {
818 err = map->ops->map_update_elem(map, key, value, attr->flags);
822 /* must increment bpf_prog_active to avoid kprobe+bpf triggering from
823 * inside bpf map update or delete otherwise deadlocks are possible
826 __this_cpu_inc(bpf_prog_active);
827 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
828 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
829 err = bpf_percpu_hash_update(map, key, value, attr->flags);
830 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
831 err = bpf_percpu_array_update(map, key, value, attr->flags);
832 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
833 err = bpf_percpu_cgroup_storage_update(map, key, value,
835 } else if (IS_FD_ARRAY(map)) {
837 err = bpf_fd_array_map_update_elem(map, f.file, key, value,
840 } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
842 err = bpf_fd_htab_map_update_elem(map, f.file, key, value,
845 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
846 /* rcu_read_lock() is not needed */
847 err = bpf_fd_reuseport_array_update_elem(map, key, value,
851 err = map->ops->map_update_elem(map, key, value, attr->flags);
854 __this_cpu_dec(bpf_prog_active);
856 maybe_wait_bpf_programs(map);
867 #define BPF_MAP_DELETE_ELEM_LAST_FIELD key
869 static int map_delete_elem(union bpf_attr *attr)
871 void __user *ukey = u64_to_user_ptr(attr->key);
872 int ufd = attr->map_fd;
878 if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
882 map = __bpf_map_get(f);
886 if (!(f.file->f_mode & FMODE_CAN_WRITE)) {
891 key = memdup_user(ukey, map->key_size);
897 if (bpf_map_is_dev_bound(map)) {
898 err = bpf_map_offload_delete_elem(map, key);
903 __this_cpu_inc(bpf_prog_active);
905 err = map->ops->map_delete_elem(map, key);
907 __this_cpu_dec(bpf_prog_active);
909 maybe_wait_bpf_programs(map);
917 /* last field in 'union bpf_attr' used by this command */
918 #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
920 static int map_get_next_key(union bpf_attr *attr)
922 void __user *ukey = u64_to_user_ptr(attr->key);
923 void __user *unext_key = u64_to_user_ptr(attr->next_key);
924 int ufd = attr->map_fd;
926 void *key, *next_key;
930 if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
934 map = __bpf_map_get(f);
938 if (!(f.file->f_mode & FMODE_CAN_READ)) {
944 key = memdup_user(ukey, map->key_size);
954 next_key = kmalloc(map->key_size, GFP_USER);
958 if (bpf_map_is_dev_bound(map)) {
959 err = bpf_map_offload_get_next_key(map, key, next_key);
964 err = map->ops->map_get_next_key(map, key, next_key);
971 if (copy_to_user(unext_key, next_key, map->key_size) != 0)
985 static const struct bpf_prog_ops * const bpf_prog_types[] = {
986 #define BPF_PROG_TYPE(_id, _name) \
987 [_id] = & _name ## _prog_ops,
988 #define BPF_MAP_TYPE(_id, _ops)
989 #include <linux/bpf_types.h>
994 static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
996 const struct bpf_prog_ops *ops;
998 if (type >= ARRAY_SIZE(bpf_prog_types))
1000 type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
1001 ops = bpf_prog_types[type];
1005 if (!bpf_prog_is_dev_bound(prog->aux))
1006 prog->aux->ops = ops;
1008 prog->aux->ops = &bpf_offload_prog_ops;
1013 /* drop refcnt on maps used by eBPF program and free auxilary data */
1014 static void free_used_maps(struct bpf_prog_aux *aux)
1016 enum bpf_cgroup_storage_type stype;
1019 for_each_cgroup_storage_type(stype) {
1020 if (!aux->cgroup_storage[stype])
1022 bpf_cgroup_storage_release(aux->prog,
1023 aux->cgroup_storage[stype]);
1026 for (i = 0; i < aux->used_map_cnt; i++)
1027 bpf_map_put(aux->used_maps[i]);
1029 kfree(aux->used_maps);
1032 int __bpf_prog_charge(struct user_struct *user, u32 pages)
1034 unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
1035 unsigned long user_bufs;
1038 user_bufs = atomic_long_add_return(pages, &user->locked_vm);
1039 if (user_bufs > memlock_limit) {
1040 atomic_long_sub(pages, &user->locked_vm);
1048 void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1051 atomic_long_sub(pages, &user->locked_vm);
1054 static int bpf_prog_charge_memlock(struct bpf_prog *prog)
1056 struct user_struct *user = get_current_user();
1059 ret = __bpf_prog_charge(user, prog->pages);
1065 prog->aux->user = user;
1069 static void bpf_prog_uncharge_memlock(struct bpf_prog *prog)
1071 struct user_struct *user = prog->aux->user;
1073 __bpf_prog_uncharge(user, prog->pages);
1077 static int bpf_prog_alloc_id(struct bpf_prog *prog)
1081 idr_preload(GFP_KERNEL);
1082 spin_lock_bh(&prog_idr_lock);
1083 id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
1086 spin_unlock_bh(&prog_idr_lock);
1089 /* id is in [1, INT_MAX) */
1090 if (WARN_ON_ONCE(!id))
1093 return id > 0 ? 0 : id;
1096 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock)
1098 /* cBPF to eBPF migrations are currently not in the idr store.
1099 * Offloaded programs are removed from the store when their device
1100 * disappears - even if someone grabs an fd to them they are unusable,
1101 * simply waiting for refcnt to drop to be freed.
1107 spin_lock_bh(&prog_idr_lock);
1109 __acquire(&prog_idr_lock);
1111 idr_remove(&prog_idr, prog->aux->id);
1115 spin_unlock_bh(&prog_idr_lock);
1117 __release(&prog_idr_lock);
1120 static void __bpf_prog_put_rcu(struct rcu_head *rcu)
1122 struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
1124 free_used_maps(aux);
1125 bpf_prog_uncharge_memlock(aux->prog);
1126 security_bpf_prog_free(aux);
1127 bpf_prog_free(aux->prog);
1130 static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
1132 if (atomic_dec_and_test(&prog->aux->refcnt)) {
1133 /* bpf_prog_free_id() must be called first */
1134 bpf_prog_free_id(prog, do_idr_lock);
1135 bpf_prog_kallsyms_del_all(prog);
1137 call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
1141 void bpf_prog_put(struct bpf_prog *prog)
1143 __bpf_prog_put(prog, true);
1145 EXPORT_SYMBOL_GPL(bpf_prog_put);
1147 static int bpf_prog_release(struct inode *inode, struct file *filp)
1149 struct bpf_prog *prog = filp->private_data;
1155 #ifdef CONFIG_PROC_FS
1156 static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
1158 const struct bpf_prog *prog = filp->private_data;
1159 char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
1161 bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
1171 prog->pages * 1ULL << PAGE_SHIFT,
1176 const struct file_operations bpf_prog_fops = {
1177 #ifdef CONFIG_PROC_FS
1178 .show_fdinfo = bpf_prog_show_fdinfo,
1180 .release = bpf_prog_release,
1181 .read = bpf_dummy_read,
1182 .write = bpf_dummy_write,
1185 int bpf_prog_new_fd(struct bpf_prog *prog)
1189 ret = security_bpf_prog(prog);
1193 return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
1194 O_RDWR | O_CLOEXEC);
1197 static struct bpf_prog *____bpf_prog_get(struct fd f)
1200 return ERR_PTR(-EBADF);
1201 if (f.file->f_op != &bpf_prog_fops) {
1203 return ERR_PTR(-EINVAL);
1206 return f.file->private_data;
1209 struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i)
1211 if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) {
1212 atomic_sub(i, &prog->aux->refcnt);
1213 return ERR_PTR(-EBUSY);
1217 EXPORT_SYMBOL_GPL(bpf_prog_add);
1219 void bpf_prog_sub(struct bpf_prog *prog, int i)
1221 /* Only to be used for undoing previous bpf_prog_add() in some
1222 * error path. We still know that another entity in our call
1223 * path holds a reference to the program, thus atomic_sub() can
1224 * be safely used in such cases!
1226 WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0);
1228 EXPORT_SYMBOL_GPL(bpf_prog_sub);
1230 struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
1232 return bpf_prog_add(prog, 1);
1234 EXPORT_SYMBOL_GPL(bpf_prog_inc);
1236 /* prog_idr_lock should have been held */
1237 struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
1241 refold = atomic_fetch_add_unless(&prog->aux->refcnt, 1, 0);
1243 if (refold >= BPF_MAX_REFCNT) {
1244 __bpf_prog_put(prog, false);
1245 return ERR_PTR(-EBUSY);
1249 return ERR_PTR(-ENOENT);
1253 EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
1255 bool bpf_prog_get_ok(struct bpf_prog *prog,
1256 enum bpf_prog_type *attach_type, bool attach_drv)
1258 /* not an attachment, just a refcount inc, always allow */
1262 if (prog->type != *attach_type)
1264 if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv)
1270 static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
1273 struct fd f = fdget(ufd);
1274 struct bpf_prog *prog;
1276 prog = ____bpf_prog_get(f);
1279 if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
1280 prog = ERR_PTR(-EINVAL);
1284 prog = bpf_prog_inc(prog);
1290 struct bpf_prog *bpf_prog_get(u32 ufd)
1292 return __bpf_prog_get(ufd, NULL, false);
1295 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1298 return __bpf_prog_get(ufd, &type, attach_drv);
1300 EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
1302 /* Initially all BPF programs could be loaded w/o specifying
1303 * expected_attach_type. Later for some of them specifying expected_attach_type
1304 * at load time became required so that program could be validated properly.
1305 * Programs of types that are allowed to be loaded both w/ and w/o (for
1306 * backward compatibility) expected_attach_type, should have the default attach
1307 * type assigned to expected_attach_type for the latter case, so that it can be
1308 * validated later at attach time.
1310 * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
1311 * prog type requires it but has some attach types that have to be backward
1314 static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
1316 switch (attr->prog_type) {
1317 case BPF_PROG_TYPE_CGROUP_SOCK:
1318 /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
1319 * exist so checking for non-zero is the way to go here.
1321 if (!attr->expected_attach_type)
1322 attr->expected_attach_type =
1323 BPF_CGROUP_INET_SOCK_CREATE;
1329 bpf_prog_load_check_attach_type(enum bpf_prog_type prog_type,
1330 enum bpf_attach_type expected_attach_type)
1332 switch (prog_type) {
1333 case BPF_PROG_TYPE_CGROUP_SOCK:
1334 switch (expected_attach_type) {
1335 case BPF_CGROUP_INET_SOCK_CREATE:
1336 case BPF_CGROUP_INET4_POST_BIND:
1337 case BPF_CGROUP_INET6_POST_BIND:
1342 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1343 switch (expected_attach_type) {
1344 case BPF_CGROUP_INET4_BIND:
1345 case BPF_CGROUP_INET6_BIND:
1346 case BPF_CGROUP_INET4_CONNECT:
1347 case BPF_CGROUP_INET6_CONNECT:
1348 case BPF_CGROUP_UDP4_SENDMSG:
1349 case BPF_CGROUP_UDP6_SENDMSG:
1359 /* last field in 'union bpf_attr' used by this command */
1360 #define BPF_PROG_LOAD_LAST_FIELD expected_attach_type
1362 static int bpf_prog_load(union bpf_attr *attr)
1364 enum bpf_prog_type type = attr->prog_type;
1365 struct bpf_prog *prog;
1370 if (CHECK_ATTR(BPF_PROG_LOAD))
1373 if (attr->prog_flags & ~BPF_F_STRICT_ALIGNMENT)
1376 /* copy eBPF program license from user space */
1377 if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
1378 sizeof(license) - 1) < 0)
1380 license[sizeof(license) - 1] = 0;
1382 /* eBPF programs must be GPL compatible to use GPL-ed functions */
1383 is_gpl = license_is_gpl_compatible(license);
1385 if (attr->insn_cnt == 0 || attr->insn_cnt > BPF_MAXINSNS)
1388 if (type == BPF_PROG_TYPE_KPROBE &&
1389 attr->kern_version != LINUX_VERSION_CODE)
1392 if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
1393 type != BPF_PROG_TYPE_CGROUP_SKB &&
1394 !capable(CAP_SYS_ADMIN))
1397 bpf_prog_load_fixup_attach_type(attr);
1398 if (bpf_prog_load_check_attach_type(type, attr->expected_attach_type))
1401 /* plain bpf_prog allocation */
1402 prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
1406 prog->expected_attach_type = attr->expected_attach_type;
1408 prog->aux->offload_requested = !!attr->prog_ifindex;
1410 err = security_bpf_prog_alloc(prog->aux);
1412 goto free_prog_nouncharge;
1414 err = bpf_prog_charge_memlock(prog);
1418 prog->len = attr->insn_cnt;
1421 if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
1422 bpf_prog_insn_size(prog)) != 0)
1425 prog->orig_prog = NULL;
1428 atomic_set(&prog->aux->refcnt, 1);
1429 prog->gpl_compatible = is_gpl ? 1 : 0;
1431 if (bpf_prog_is_dev_bound(prog->aux)) {
1432 err = bpf_prog_offload_init(prog, attr);
1437 /* find program type: socket_filter vs tracing_filter */
1438 err = find_prog_type(type, prog);
1442 prog->aux->load_time = ktime_get_boot_ns();
1443 err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name);
1447 /* run eBPF verifier */
1448 err = bpf_check(&prog, attr);
1450 goto free_used_maps;
1452 prog = bpf_prog_select_runtime(prog, &err);
1454 goto free_used_maps;
1456 err = bpf_prog_alloc_id(prog);
1458 goto free_used_maps;
1460 err = bpf_prog_new_fd(prog);
1462 /* failed to allocate fd.
1463 * bpf_prog_put() is needed because the above
1464 * bpf_prog_alloc_id() has published the prog
1465 * to the userspace and the userspace may
1466 * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID.
1472 bpf_prog_kallsyms_add(prog);
1476 bpf_prog_kallsyms_del_subprogs(prog);
1477 free_used_maps(prog->aux);
1479 bpf_prog_uncharge_memlock(prog);
1481 security_bpf_prog_free(prog->aux);
1482 free_prog_nouncharge:
1483 bpf_prog_free(prog);
1487 #define BPF_OBJ_LAST_FIELD file_flags
1489 static int bpf_obj_pin(const union bpf_attr *attr)
1491 if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
1494 return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
1497 static int bpf_obj_get(const union bpf_attr *attr)
1499 if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
1500 attr->file_flags & ~BPF_OBJ_FLAG_MASK)
1503 return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
1507 struct bpf_raw_tracepoint {
1508 struct bpf_raw_event_map *btp;
1509 struct bpf_prog *prog;
1512 static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp)
1514 struct bpf_raw_tracepoint *raw_tp = filp->private_data;
1517 bpf_probe_unregister(raw_tp->btp, raw_tp->prog);
1518 bpf_prog_put(raw_tp->prog);
1524 static const struct file_operations bpf_raw_tp_fops = {
1525 .release = bpf_raw_tracepoint_release,
1526 .read = bpf_dummy_read,
1527 .write = bpf_dummy_write,
1530 #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
1532 static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
1534 struct bpf_raw_tracepoint *raw_tp;
1535 struct bpf_raw_event_map *btp;
1536 struct bpf_prog *prog;
1540 if (strncpy_from_user(tp_name, u64_to_user_ptr(attr->raw_tracepoint.name),
1541 sizeof(tp_name) - 1) < 0)
1543 tp_name[sizeof(tp_name) - 1] = 0;
1545 btp = bpf_find_raw_tracepoint(tp_name);
1549 raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER);
1554 prog = bpf_prog_get_type(attr->raw_tracepoint.prog_fd,
1555 BPF_PROG_TYPE_RAW_TRACEPOINT);
1557 err = PTR_ERR(prog);
1561 err = bpf_probe_register(raw_tp->btp, prog);
1565 raw_tp->prog = prog;
1566 tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp,
1569 bpf_probe_unregister(raw_tp->btp, prog);
1582 static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
1583 enum bpf_attach_type attach_type)
1585 switch (prog->type) {
1586 case BPF_PROG_TYPE_CGROUP_SOCK:
1587 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1588 return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
1594 #define BPF_PROG_ATTACH_LAST_FIELD attach_flags
1596 #define BPF_F_ATTACH_MASK \
1597 (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI)
1599 static int bpf_prog_attach(const union bpf_attr *attr)
1601 enum bpf_prog_type ptype;
1602 struct bpf_prog *prog;
1605 if (!capable(CAP_NET_ADMIN))
1608 if (CHECK_ATTR(BPF_PROG_ATTACH))
1611 if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
1614 switch (attr->attach_type) {
1615 case BPF_CGROUP_INET_INGRESS:
1616 case BPF_CGROUP_INET_EGRESS:
1617 ptype = BPF_PROG_TYPE_CGROUP_SKB;
1619 case BPF_CGROUP_INET_SOCK_CREATE:
1620 case BPF_CGROUP_INET4_POST_BIND:
1621 case BPF_CGROUP_INET6_POST_BIND:
1622 ptype = BPF_PROG_TYPE_CGROUP_SOCK;
1624 case BPF_CGROUP_INET4_BIND:
1625 case BPF_CGROUP_INET6_BIND:
1626 case BPF_CGROUP_INET4_CONNECT:
1627 case BPF_CGROUP_INET6_CONNECT:
1628 case BPF_CGROUP_UDP4_SENDMSG:
1629 case BPF_CGROUP_UDP6_SENDMSG:
1630 ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
1632 case BPF_CGROUP_SOCK_OPS:
1633 ptype = BPF_PROG_TYPE_SOCK_OPS;
1635 case BPF_CGROUP_DEVICE:
1636 ptype = BPF_PROG_TYPE_CGROUP_DEVICE;
1638 case BPF_SK_MSG_VERDICT:
1639 ptype = BPF_PROG_TYPE_SK_MSG;
1641 case BPF_SK_SKB_STREAM_PARSER:
1642 case BPF_SK_SKB_STREAM_VERDICT:
1643 ptype = BPF_PROG_TYPE_SK_SKB;
1645 case BPF_LIRC_MODE2:
1646 ptype = BPF_PROG_TYPE_LIRC_MODE2;
1648 case BPF_FLOW_DISSECTOR:
1649 ptype = BPF_PROG_TYPE_FLOW_DISSECTOR;
1655 prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
1657 return PTR_ERR(prog);
1659 if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
1665 case BPF_PROG_TYPE_SK_SKB:
1666 case BPF_PROG_TYPE_SK_MSG:
1667 ret = sock_map_get_from_fd(attr, prog);
1669 case BPF_PROG_TYPE_LIRC_MODE2:
1670 ret = lirc_prog_attach(attr, prog);
1672 case BPF_PROG_TYPE_FLOW_DISSECTOR:
1673 ret = skb_flow_dissector_bpf_prog_attach(attr, prog);
1676 ret = cgroup_bpf_prog_attach(attr, ptype, prog);
1684 #define BPF_PROG_DETACH_LAST_FIELD attach_type
1686 static int bpf_prog_detach(const union bpf_attr *attr)
1688 enum bpf_prog_type ptype;
1690 if (!capable(CAP_NET_ADMIN))
1693 if (CHECK_ATTR(BPF_PROG_DETACH))
1696 switch (attr->attach_type) {
1697 case BPF_CGROUP_INET_INGRESS:
1698 case BPF_CGROUP_INET_EGRESS:
1699 ptype = BPF_PROG_TYPE_CGROUP_SKB;
1701 case BPF_CGROUP_INET_SOCK_CREATE:
1702 case BPF_CGROUP_INET4_POST_BIND:
1703 case BPF_CGROUP_INET6_POST_BIND:
1704 ptype = BPF_PROG_TYPE_CGROUP_SOCK;
1706 case BPF_CGROUP_INET4_BIND:
1707 case BPF_CGROUP_INET6_BIND:
1708 case BPF_CGROUP_INET4_CONNECT:
1709 case BPF_CGROUP_INET6_CONNECT:
1710 case BPF_CGROUP_UDP4_SENDMSG:
1711 case BPF_CGROUP_UDP6_SENDMSG:
1712 ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
1714 case BPF_CGROUP_SOCK_OPS:
1715 ptype = BPF_PROG_TYPE_SOCK_OPS;
1717 case BPF_CGROUP_DEVICE:
1718 ptype = BPF_PROG_TYPE_CGROUP_DEVICE;
1720 case BPF_SK_MSG_VERDICT:
1721 return sock_map_get_from_fd(attr, NULL);
1722 case BPF_SK_SKB_STREAM_PARSER:
1723 case BPF_SK_SKB_STREAM_VERDICT:
1724 return sock_map_get_from_fd(attr, NULL);
1725 case BPF_LIRC_MODE2:
1726 return lirc_prog_detach(attr);
1727 case BPF_FLOW_DISSECTOR:
1728 return skb_flow_dissector_bpf_prog_detach(attr);
1733 return cgroup_bpf_prog_detach(attr, ptype);
1736 #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
1738 static int bpf_prog_query(const union bpf_attr *attr,
1739 union bpf_attr __user *uattr)
1741 if (!capable(CAP_NET_ADMIN))
1743 if (CHECK_ATTR(BPF_PROG_QUERY))
1745 if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
1748 switch (attr->query.attach_type) {
1749 case BPF_CGROUP_INET_INGRESS:
1750 case BPF_CGROUP_INET_EGRESS:
1751 case BPF_CGROUP_INET_SOCK_CREATE:
1752 case BPF_CGROUP_INET4_BIND:
1753 case BPF_CGROUP_INET6_BIND:
1754 case BPF_CGROUP_INET4_POST_BIND:
1755 case BPF_CGROUP_INET6_POST_BIND:
1756 case BPF_CGROUP_INET4_CONNECT:
1757 case BPF_CGROUP_INET6_CONNECT:
1758 case BPF_CGROUP_UDP4_SENDMSG:
1759 case BPF_CGROUP_UDP6_SENDMSG:
1760 case BPF_CGROUP_SOCK_OPS:
1761 case BPF_CGROUP_DEVICE:
1763 case BPF_LIRC_MODE2:
1764 return lirc_prog_query(attr, uattr);
1769 return cgroup_bpf_prog_query(attr, uattr);
1772 #define BPF_PROG_TEST_RUN_LAST_FIELD test.duration
1774 static int bpf_prog_test_run(const union bpf_attr *attr,
1775 union bpf_attr __user *uattr)
1777 struct bpf_prog *prog;
1778 int ret = -ENOTSUPP;
1780 if (!capable(CAP_SYS_ADMIN))
1782 if (CHECK_ATTR(BPF_PROG_TEST_RUN))
1785 prog = bpf_prog_get(attr->test.prog_fd);
1787 return PTR_ERR(prog);
1789 if (prog->aux->ops->test_run)
1790 ret = prog->aux->ops->test_run(prog, attr, uattr);
1796 #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
1798 static int bpf_obj_get_next_id(const union bpf_attr *attr,
1799 union bpf_attr __user *uattr,
1803 u32 next_id = attr->start_id;
1806 if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
1809 if (!capable(CAP_SYS_ADMIN))
1814 if (!idr_get_next(idr, &next_id))
1816 spin_unlock_bh(lock);
1819 err = put_user(next_id, &uattr->next_id);
1824 #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
1826 static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
1828 struct bpf_prog *prog;
1829 u32 id = attr->prog_id;
1832 if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
1835 if (!capable(CAP_SYS_ADMIN))
1838 spin_lock_bh(&prog_idr_lock);
1839 prog = idr_find(&prog_idr, id);
1841 prog = bpf_prog_inc_not_zero(prog);
1843 prog = ERR_PTR(-ENOENT);
1844 spin_unlock_bh(&prog_idr_lock);
1847 return PTR_ERR(prog);
1849 fd = bpf_prog_new_fd(prog);
1856 #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
1858 static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
1860 struct bpf_map *map;
1861 u32 id = attr->map_id;
1865 if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
1866 attr->open_flags & ~BPF_OBJ_FLAG_MASK)
1869 if (!capable(CAP_SYS_ADMIN))
1872 f_flags = bpf_get_file_flag(attr->open_flags);
1876 spin_lock_bh(&map_idr_lock);
1877 map = idr_find(&map_idr, id);
1879 map = bpf_map_inc_not_zero(map, true);
1881 map = ERR_PTR(-ENOENT);
1882 spin_unlock_bh(&map_idr_lock);
1885 return PTR_ERR(map);
1887 fd = bpf_map_new_fd(map, f_flags);
1894 static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
1899 for (i = 0; i < prog->aux->used_map_cnt; i++)
1900 if (prog->aux->used_maps[i] == (void *)addr)
1901 return prog->aux->used_maps[i];
1905 static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog)
1907 const struct bpf_map *map;
1908 struct bpf_insn *insns;
1912 insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
1917 for (i = 0; i < prog->len; i++) {
1918 if (insns[i].code == (BPF_JMP | BPF_TAIL_CALL)) {
1919 insns[i].code = BPF_JMP | BPF_CALL;
1920 insns[i].imm = BPF_FUNC_tail_call;
1923 if (insns[i].code == (BPF_JMP | BPF_CALL) ||
1924 insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) {
1925 if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS))
1926 insns[i].code = BPF_JMP | BPF_CALL;
1927 if (!bpf_dump_raw_ok())
1932 if (insns[i].code != (BPF_LD | BPF_IMM | BPF_DW))
1935 imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
1936 map = bpf_map_from_imm(prog, imm);
1938 insns[i].src_reg = BPF_PSEUDO_MAP_FD;
1939 insns[i].imm = map->id;
1940 insns[i + 1].imm = 0;
1944 if (!bpf_dump_raw_ok() &&
1945 imm == (unsigned long)prog->aux) {
1947 insns[i + 1].imm = 0;
1955 static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
1956 const union bpf_attr *attr,
1957 union bpf_attr __user *uattr)
1959 struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
1960 struct bpf_prog_info info = {};
1961 u32 info_len = attr->info.info_len;
1962 char __user *uinsns;
1966 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
1969 info_len = min_t(u32, sizeof(info), info_len);
1971 if (copy_from_user(&info, uinfo, info_len))
1974 info.type = prog->type;
1975 info.id = prog->aux->id;
1976 info.load_time = prog->aux->load_time;
1977 info.created_by_uid = from_kuid_munged(current_user_ns(),
1978 prog->aux->user->uid);
1979 info.gpl_compatible = prog->gpl_compatible;
1981 memcpy(info.tag, prog->tag, sizeof(prog->tag));
1982 memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
1984 ulen = info.nr_map_ids;
1985 info.nr_map_ids = prog->aux->used_map_cnt;
1986 ulen = min_t(u32, info.nr_map_ids, ulen);
1988 u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
1991 for (i = 0; i < ulen; i++)
1992 if (put_user(prog->aux->used_maps[i]->id,
1997 if (!capable(CAP_SYS_ADMIN)) {
1998 info.jited_prog_len = 0;
1999 info.xlated_prog_len = 0;
2000 info.nr_jited_ksyms = 0;
2004 ulen = info.xlated_prog_len;
2005 info.xlated_prog_len = bpf_prog_insn_size(prog);
2006 if (info.xlated_prog_len && ulen) {
2007 struct bpf_insn *insns_sanitized;
2010 if (prog->blinded && !bpf_dump_raw_ok()) {
2011 info.xlated_prog_insns = 0;
2014 insns_sanitized = bpf_insn_prepare_dump(prog);
2015 if (!insns_sanitized)
2017 uinsns = u64_to_user_ptr(info.xlated_prog_insns);
2018 ulen = min_t(u32, info.xlated_prog_len, ulen);
2019 fault = copy_to_user(uinsns, insns_sanitized, ulen);
2020 kfree(insns_sanitized);
2025 if (bpf_prog_is_dev_bound(prog->aux)) {
2026 err = bpf_prog_offload_info_fill(&info, prog);
2032 /* NOTE: the following code is supposed to be skipped for offload.
2033 * bpf_prog_offload_info_fill() is the place to fill similar fields
2036 ulen = info.jited_prog_len;
2037 if (prog->aux->func_cnt) {
2040 info.jited_prog_len = 0;
2041 for (i = 0; i < prog->aux->func_cnt; i++)
2042 info.jited_prog_len += prog->aux->func[i]->jited_len;
2044 info.jited_prog_len = prog->jited_len;
2047 if (info.jited_prog_len && ulen) {
2048 if (bpf_dump_raw_ok()) {
2049 uinsns = u64_to_user_ptr(info.jited_prog_insns);
2050 ulen = min_t(u32, info.jited_prog_len, ulen);
2052 /* for multi-function programs, copy the JITed
2053 * instructions for all the functions
2055 if (prog->aux->func_cnt) {
2060 for (i = 0; i < prog->aux->func_cnt; i++) {
2061 len = prog->aux->func[i]->jited_len;
2062 len = min_t(u32, len, free);
2063 img = (u8 *) prog->aux->func[i]->bpf_func;
2064 if (copy_to_user(uinsns, img, len))
2072 if (copy_to_user(uinsns, prog->bpf_func, ulen))
2076 info.jited_prog_insns = 0;
2080 ulen = info.nr_jited_ksyms;
2081 info.nr_jited_ksyms = prog->aux->func_cnt;
2082 if (info.nr_jited_ksyms && ulen) {
2083 if (bpf_dump_raw_ok()) {
2084 u64 __user *user_ksyms;
2088 /* copy the address of the kernel symbol
2089 * corresponding to each function
2091 ulen = min_t(u32, info.nr_jited_ksyms, ulen);
2092 user_ksyms = u64_to_user_ptr(info.jited_ksyms);
2093 for (i = 0; i < ulen; i++) {
2094 ksym_addr = (ulong) prog->aux->func[i]->bpf_func;
2095 ksym_addr &= PAGE_MASK;
2096 if (put_user((u64) ksym_addr, &user_ksyms[i]))
2100 info.jited_ksyms = 0;
2104 ulen = info.nr_jited_func_lens;
2105 info.nr_jited_func_lens = prog->aux->func_cnt;
2106 if (info.nr_jited_func_lens && ulen) {
2107 if (bpf_dump_raw_ok()) {
2108 u32 __user *user_lens;
2111 /* copy the JITed image lengths for each function */
2112 ulen = min_t(u32, info.nr_jited_func_lens, ulen);
2113 user_lens = u64_to_user_ptr(info.jited_func_lens);
2114 for (i = 0; i < ulen; i++) {
2115 func_len = prog->aux->func[i]->jited_len;
2116 if (put_user(func_len, &user_lens[i]))
2120 info.jited_func_lens = 0;
2125 if (copy_to_user(uinfo, &info, info_len) ||
2126 put_user(info_len, &uattr->info.info_len))
2132 static int bpf_map_get_info_by_fd(struct bpf_map *map,
2133 const union bpf_attr *attr,
2134 union bpf_attr __user *uattr)
2136 struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2137 struct bpf_map_info info = {};
2138 u32 info_len = attr->info.info_len;
2141 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
2144 info_len = min_t(u32, sizeof(info), info_len);
2146 info.type = map->map_type;
2148 info.key_size = map->key_size;
2149 info.value_size = map->value_size;
2150 info.max_entries = map->max_entries;
2151 info.map_flags = map->map_flags;
2152 memcpy(info.name, map->name, sizeof(map->name));
2155 info.btf_id = btf_id(map->btf);
2156 info.btf_key_type_id = map->btf_key_type_id;
2157 info.btf_value_type_id = map->btf_value_type_id;
2160 if (bpf_map_is_dev_bound(map)) {
2161 err = bpf_map_offload_info_fill(&info, map);
2166 if (copy_to_user(uinfo, &info, info_len) ||
2167 put_user(info_len, &uattr->info.info_len))
2173 static int bpf_btf_get_info_by_fd(struct btf *btf,
2174 const union bpf_attr *attr,
2175 union bpf_attr __user *uattr)
2177 struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2178 u32 info_len = attr->info.info_len;
2181 err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len);
2185 return btf_get_info_by_fd(btf, attr, uattr);
2188 #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
2190 static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
2191 union bpf_attr __user *uattr)
2193 int ufd = attr->info.bpf_fd;
2197 if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
2204 if (f.file->f_op == &bpf_prog_fops)
2205 err = bpf_prog_get_info_by_fd(f.file->private_data, attr,
2207 else if (f.file->f_op == &bpf_map_fops)
2208 err = bpf_map_get_info_by_fd(f.file->private_data, attr,
2210 else if (f.file->f_op == &btf_fops)
2211 err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr);
2219 #define BPF_BTF_LOAD_LAST_FIELD btf_log_level
2221 static int bpf_btf_load(const union bpf_attr *attr)
2223 if (CHECK_ATTR(BPF_BTF_LOAD))
2226 if (!capable(CAP_SYS_ADMIN))
2229 return btf_new_fd(attr);
2232 #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
2234 static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
2236 if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
2239 if (!capable(CAP_SYS_ADMIN))
2242 return btf_get_fd_by_id(attr->btf_id);
2245 static int bpf_task_fd_query_copy(const union bpf_attr *attr,
2246 union bpf_attr __user *uattr,
2247 u32 prog_id, u32 fd_type,
2248 const char *buf, u64 probe_offset,
2251 char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
2252 u32 len = buf ? strlen(buf) : 0, input_len;
2255 if (put_user(len, &uattr->task_fd_query.buf_len))
2257 input_len = attr->task_fd_query.buf_len;
2258 if (input_len && ubuf) {
2260 /* nothing to copy, just make ubuf NULL terminated */
2263 if (put_user(zero, ubuf))
2265 } else if (input_len >= len + 1) {
2266 /* ubuf can hold the string with NULL terminator */
2267 if (copy_to_user(ubuf, buf, len + 1))
2270 /* ubuf cannot hold the string with NULL terminator,
2271 * do a partial copy with NULL terminator.
2276 if (copy_to_user(ubuf, buf, input_len - 1))
2278 if (put_user(zero, ubuf + input_len - 1))
2283 if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
2284 put_user(fd_type, &uattr->task_fd_query.fd_type) ||
2285 put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
2286 put_user(probe_addr, &uattr->task_fd_query.probe_addr))
2292 #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
2294 static int bpf_task_fd_query(const union bpf_attr *attr,
2295 union bpf_attr __user *uattr)
2297 pid_t pid = attr->task_fd_query.pid;
2298 u32 fd = attr->task_fd_query.fd;
2299 const struct perf_event *event;
2300 struct files_struct *files;
2301 struct task_struct *task;
2305 if (CHECK_ATTR(BPF_TASK_FD_QUERY))
2308 if (!capable(CAP_SYS_ADMIN))
2311 if (attr->task_fd_query.flags != 0)
2314 task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
2318 files = get_files_struct(task);
2319 put_task_struct(task);
2324 spin_lock(&files->file_lock);
2325 file = fcheck_files(files, fd);
2330 spin_unlock(&files->file_lock);
2331 put_files_struct(files);
2336 if (file->f_op == &bpf_raw_tp_fops) {
2337 struct bpf_raw_tracepoint *raw_tp = file->private_data;
2338 struct bpf_raw_event_map *btp = raw_tp->btp;
2340 err = bpf_task_fd_query_copy(attr, uattr,
2341 raw_tp->prog->aux->id,
2342 BPF_FD_TYPE_RAW_TRACEPOINT,
2343 btp->tp->name, 0, 0);
2347 event = perf_get_event(file);
2348 if (!IS_ERR(event)) {
2349 u64 probe_offset, probe_addr;
2350 u32 prog_id, fd_type;
2353 err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
2354 &buf, &probe_offset,
2357 err = bpf_task_fd_query_copy(attr, uattr, prog_id,
2371 SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
2373 union bpf_attr attr = {};
2376 if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN))
2379 err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
2382 size = min_t(u32, size, sizeof(attr));
2384 /* copy attributes from user space, may be less than sizeof(bpf_attr) */
2385 if (copy_from_user(&attr, uattr, size) != 0)
2388 err = security_bpf(cmd, &attr, size);
2393 case BPF_MAP_CREATE:
2394 err = map_create(&attr);
2396 case BPF_MAP_LOOKUP_ELEM:
2397 err = map_lookup_elem(&attr);
2399 case BPF_MAP_UPDATE_ELEM:
2400 err = map_update_elem(&attr);
2402 case BPF_MAP_DELETE_ELEM:
2403 err = map_delete_elem(&attr);
2405 case BPF_MAP_GET_NEXT_KEY:
2406 err = map_get_next_key(&attr);
2409 err = bpf_prog_load(&attr);
2412 err = bpf_obj_pin(&attr);
2415 err = bpf_obj_get(&attr);
2417 case BPF_PROG_ATTACH:
2418 err = bpf_prog_attach(&attr);
2420 case BPF_PROG_DETACH:
2421 err = bpf_prog_detach(&attr);
2423 case BPF_PROG_QUERY:
2424 err = bpf_prog_query(&attr, uattr);
2426 case BPF_PROG_TEST_RUN:
2427 err = bpf_prog_test_run(&attr, uattr);
2429 case BPF_PROG_GET_NEXT_ID:
2430 err = bpf_obj_get_next_id(&attr, uattr,
2431 &prog_idr, &prog_idr_lock);
2433 case BPF_MAP_GET_NEXT_ID:
2434 err = bpf_obj_get_next_id(&attr, uattr,
2435 &map_idr, &map_idr_lock);
2437 case BPF_PROG_GET_FD_BY_ID:
2438 err = bpf_prog_get_fd_by_id(&attr);
2440 case BPF_MAP_GET_FD_BY_ID:
2441 err = bpf_map_get_fd_by_id(&attr);
2443 case BPF_OBJ_GET_INFO_BY_FD:
2444 err = bpf_obj_get_info_by_fd(&attr, uattr);
2446 case BPF_RAW_TRACEPOINT_OPEN:
2447 err = bpf_raw_tracepoint_open(&attr);
2450 err = bpf_btf_load(&attr);
2452 case BPF_BTF_GET_FD_BY_ID:
2453 err = bpf_btf_get_fd_by_id(&attr);
2455 case BPF_TASK_FD_QUERY:
2456 err = bpf_task_fd_query(&attr, uattr);