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5b497af4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
99c55f7d | 2 | /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
99c55f7d AS |
3 | */ |
4 | #include <linux/bpf.h> | |
a67edbf4 | 5 | #include <linux/bpf_trace.h> |
f4364dcf | 6 | #include <linux/bpf_lirc.h> |
f56a653c | 7 | #include <linux/btf.h> |
99c55f7d AS |
8 | #include <linux/syscalls.h> |
9 | #include <linux/slab.h> | |
3f07c014 | 10 | #include <linux/sched/signal.h> |
d407bd25 DB |
11 | #include <linux/vmalloc.h> |
12 | #include <linux/mmzone.h> | |
99c55f7d | 13 | #include <linux/anon_inodes.h> |
41bdc4b4 | 14 | #include <linux/fdtable.h> |
db20fd2b | 15 | #include <linux/file.h> |
41bdc4b4 | 16 | #include <linux/fs.h> |
09756af4 AS |
17 | #include <linux/license.h> |
18 | #include <linux/filter.h> | |
2541517c | 19 | #include <linux/version.h> |
535e7b4b | 20 | #include <linux/kernel.h> |
dc4bb0e2 | 21 | #include <linux/idr.h> |
cb4d2b3f MKL |
22 | #include <linux/cred.h> |
23 | #include <linux/timekeeping.h> | |
24 | #include <linux/ctype.h> | |
9ef09e35 | 25 | #include <linux/nospec.h> |
99c55f7d | 26 | |
14dc6f04 MKL |
27 | #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \ |
28 | (map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \ | |
29 | (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \ | |
30 | (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) | |
31 | #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) | |
32 | #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map)) | |
33 | ||
6e71b04a CF |
34 | #define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY) |
35 | ||
b121d1e7 | 36 | DEFINE_PER_CPU(int, bpf_prog_active); |
dc4bb0e2 MKL |
37 | static DEFINE_IDR(prog_idr); |
38 | static DEFINE_SPINLOCK(prog_idr_lock); | |
f3f1c054 MKL |
39 | static DEFINE_IDR(map_idr); |
40 | static DEFINE_SPINLOCK(map_idr_lock); | |
b121d1e7 | 41 | |
1be7f75d AS |
42 | int sysctl_unprivileged_bpf_disabled __read_mostly; |
43 | ||
40077e0c JB |
44 | static const struct bpf_map_ops * const bpf_map_types[] = { |
45 | #define BPF_PROG_TYPE(_id, _ops) | |
46 | #define BPF_MAP_TYPE(_id, _ops) \ | |
47 | [_id] = &_ops, | |
48 | #include <linux/bpf_types.h> | |
49 | #undef BPF_PROG_TYPE | |
50 | #undef BPF_MAP_TYPE | |
51 | }; | |
99c55f7d | 52 | |
752ba56f MS |
53 | /* |
54 | * If we're handed a bigger struct than we know of, ensure all the unknown bits | |
55 | * are 0 - i.e. new user-space does not rely on any kernel feature extensions | |
56 | * we don't know about yet. | |
57 | * | |
58 | * There is a ToCToU between this function call and the following | |
59 | * copy_from_user() call. However, this is not a concern since this function is | |
60 | * meant to be a future-proofing of bits. | |
61 | */ | |
dcab51f1 MKL |
62 | int bpf_check_uarg_tail_zero(void __user *uaddr, |
63 | size_t expected_size, | |
64 | size_t actual_size) | |
58291a74 MS |
65 | { |
66 | unsigned char __user *addr; | |
67 | unsigned char __user *end; | |
68 | unsigned char val; | |
69 | int err; | |
70 | ||
752ba56f MS |
71 | if (unlikely(actual_size > PAGE_SIZE)) /* silly large */ |
72 | return -E2BIG; | |
73 | ||
96d4f267 | 74 | if (unlikely(!access_ok(uaddr, actual_size))) |
752ba56f MS |
75 | return -EFAULT; |
76 | ||
58291a74 MS |
77 | if (actual_size <= expected_size) |
78 | return 0; | |
79 | ||
80 | addr = uaddr + expected_size; | |
81 | end = uaddr + actual_size; | |
82 | ||
83 | for (; addr < end; addr++) { | |
84 | err = get_user(val, addr); | |
85 | if (err) | |
86 | return err; | |
87 | if (val) | |
88 | return -E2BIG; | |
89 | } | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
a3884572 JK |
94 | const struct bpf_map_ops bpf_map_offload_ops = { |
95 | .map_alloc = bpf_map_offload_map_alloc, | |
96 | .map_free = bpf_map_offload_map_free, | |
e8d2bec0 | 97 | .map_check_btf = map_check_no_btf, |
a3884572 JK |
98 | }; |
99 | ||
99c55f7d AS |
100 | static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) |
101 | { | |
1110f3a9 | 102 | const struct bpf_map_ops *ops; |
9ef09e35 | 103 | u32 type = attr->map_type; |
99c55f7d | 104 | struct bpf_map *map; |
1110f3a9 | 105 | int err; |
99c55f7d | 106 | |
9ef09e35 | 107 | if (type >= ARRAY_SIZE(bpf_map_types)) |
1110f3a9 | 108 | return ERR_PTR(-EINVAL); |
9ef09e35 MR |
109 | type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types)); |
110 | ops = bpf_map_types[type]; | |
1110f3a9 | 111 | if (!ops) |
40077e0c | 112 | return ERR_PTR(-EINVAL); |
99c55f7d | 113 | |
1110f3a9 JK |
114 | if (ops->map_alloc_check) { |
115 | err = ops->map_alloc_check(attr); | |
116 | if (err) | |
117 | return ERR_PTR(err); | |
118 | } | |
a3884572 JK |
119 | if (attr->map_ifindex) |
120 | ops = &bpf_map_offload_ops; | |
1110f3a9 | 121 | map = ops->map_alloc(attr); |
40077e0c JB |
122 | if (IS_ERR(map)) |
123 | return map; | |
1110f3a9 | 124 | map->ops = ops; |
9ef09e35 | 125 | map->map_type = type; |
40077e0c | 126 | return map; |
99c55f7d AS |
127 | } |
128 | ||
96eabe7a | 129 | void *bpf_map_area_alloc(size_t size, int numa_node) |
d407bd25 | 130 | { |
f01a7dbe MP |
131 | /* We really just want to fail instead of triggering OOM killer |
132 | * under memory pressure, therefore we set __GFP_NORETRY to kmalloc, | |
133 | * which is used for lower order allocation requests. | |
134 | * | |
135 | * It has been observed that higher order allocation requests done by | |
136 | * vmalloc with __GFP_NORETRY being set might fail due to not trying | |
137 | * to reclaim memory from the page cache, thus we set | |
138 | * __GFP_RETRY_MAYFAIL to avoid such situations. | |
d407bd25 | 139 | */ |
f01a7dbe MP |
140 | |
141 | const gfp_t flags = __GFP_NOWARN | __GFP_ZERO; | |
d407bd25 DB |
142 | void *area; |
143 | ||
144 | if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { | |
f01a7dbe MP |
145 | area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags, |
146 | numa_node); | |
d407bd25 DB |
147 | if (area != NULL) |
148 | return area; | |
149 | } | |
150 | ||
f01a7dbe MP |
151 | return __vmalloc_node_flags_caller(size, numa_node, |
152 | GFP_KERNEL | __GFP_RETRY_MAYFAIL | | |
153 | flags, __builtin_return_address(0)); | |
d407bd25 DB |
154 | } |
155 | ||
156 | void bpf_map_area_free(void *area) | |
157 | { | |
158 | kvfree(area); | |
159 | } | |
160 | ||
be70bcd5 DB |
161 | static u32 bpf_map_flags_retain_permanent(u32 flags) |
162 | { | |
163 | /* Some map creation flags are not tied to the map object but | |
164 | * rather to the map fd instead, so they have no meaning upon | |
165 | * map object inspection since multiple file descriptors with | |
166 | * different (access) properties can exist here. Thus, given | |
167 | * this has zero meaning for the map itself, lets clear these | |
168 | * from here. | |
169 | */ | |
170 | return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY); | |
171 | } | |
172 | ||
bd475643 JK |
173 | void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr) |
174 | { | |
175 | map->map_type = attr->map_type; | |
176 | map->key_size = attr->key_size; | |
177 | map->value_size = attr->value_size; | |
178 | map->max_entries = attr->max_entries; | |
be70bcd5 | 179 | map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags); |
bd475643 JK |
180 | map->numa_node = bpf_map_attr_numa_node(attr); |
181 | } | |
182 | ||
6c905981 AS |
183 | int bpf_map_precharge_memlock(u32 pages) |
184 | { | |
185 | struct user_struct *user = get_current_user(); | |
186 | unsigned long memlock_limit, cur; | |
187 | ||
188 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
189 | cur = atomic_long_read(&user->locked_vm); | |
190 | free_uid(user); | |
191 | if (cur + pages > memlock_limit) | |
192 | return -EPERM; | |
193 | return 0; | |
194 | } | |
195 | ||
0a4c58f5 | 196 | static int bpf_charge_memlock(struct user_struct *user, u32 pages) |
aaac3ba9 | 197 | { |
0a4c58f5 | 198 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
aaac3ba9 | 199 | |
0a4c58f5 RG |
200 | if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) { |
201 | atomic_long_sub(pages, &user->locked_vm); | |
202 | return -EPERM; | |
203 | } | |
204 | return 0; | |
205 | } | |
aaac3ba9 | 206 | |
0a4c58f5 RG |
207 | static void bpf_uncharge_memlock(struct user_struct *user, u32 pages) |
208 | { | |
209 | atomic_long_sub(pages, &user->locked_vm); | |
210 | } | |
aaac3ba9 | 211 | |
0a4c58f5 RG |
212 | static int bpf_map_init_memlock(struct bpf_map *map) |
213 | { | |
214 | struct user_struct *user = get_current_user(); | |
215 | int ret; | |
aaac3ba9 | 216 | |
0a4c58f5 RG |
217 | ret = bpf_charge_memlock(user, map->pages); |
218 | if (ret) { | |
aaac3ba9 | 219 | free_uid(user); |
0a4c58f5 | 220 | return ret; |
aaac3ba9 AS |
221 | } |
222 | map->user = user; | |
0a4c58f5 | 223 | return ret; |
aaac3ba9 AS |
224 | } |
225 | ||
0a4c58f5 | 226 | static void bpf_map_release_memlock(struct bpf_map *map) |
aaac3ba9 AS |
227 | { |
228 | struct user_struct *user = map->user; | |
0a4c58f5 | 229 | bpf_uncharge_memlock(user, map->pages); |
aaac3ba9 AS |
230 | free_uid(user); |
231 | } | |
232 | ||
0a4c58f5 RG |
233 | int bpf_map_charge_memlock(struct bpf_map *map, u32 pages) |
234 | { | |
235 | int ret; | |
236 | ||
237 | ret = bpf_charge_memlock(map->user, pages); | |
238 | if (ret) | |
239 | return ret; | |
240 | map->pages += pages; | |
241 | return ret; | |
242 | } | |
243 | ||
244 | void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages) | |
245 | { | |
246 | bpf_uncharge_memlock(map->user, pages); | |
247 | map->pages -= pages; | |
248 | } | |
249 | ||
f3f1c054 MKL |
250 | static int bpf_map_alloc_id(struct bpf_map *map) |
251 | { | |
252 | int id; | |
253 | ||
b76354cd | 254 | idr_preload(GFP_KERNEL); |
f3f1c054 MKL |
255 | spin_lock_bh(&map_idr_lock); |
256 | id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC); | |
257 | if (id > 0) | |
258 | map->id = id; | |
259 | spin_unlock_bh(&map_idr_lock); | |
b76354cd | 260 | idr_preload_end(); |
f3f1c054 MKL |
261 | |
262 | if (WARN_ON_ONCE(!id)) | |
263 | return -ENOSPC; | |
264 | ||
265 | return id > 0 ? 0 : id; | |
266 | } | |
267 | ||
a3884572 | 268 | void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock) |
f3f1c054 | 269 | { |
930651a7 ED |
270 | unsigned long flags; |
271 | ||
a3884572 JK |
272 | /* Offloaded maps are removed from the IDR store when their device |
273 | * disappears - even if someone holds an fd to them they are unusable, | |
274 | * the memory is gone, all ops will fail; they are simply waiting for | |
275 | * refcnt to drop to be freed. | |
276 | */ | |
277 | if (!map->id) | |
278 | return; | |
279 | ||
bd5f5f4e | 280 | if (do_idr_lock) |
930651a7 | 281 | spin_lock_irqsave(&map_idr_lock, flags); |
bd5f5f4e MKL |
282 | else |
283 | __acquire(&map_idr_lock); | |
284 | ||
f3f1c054 | 285 | idr_remove(&map_idr, map->id); |
a3884572 | 286 | map->id = 0; |
bd5f5f4e MKL |
287 | |
288 | if (do_idr_lock) | |
930651a7 | 289 | spin_unlock_irqrestore(&map_idr_lock, flags); |
bd5f5f4e MKL |
290 | else |
291 | __release(&map_idr_lock); | |
f3f1c054 MKL |
292 | } |
293 | ||
99c55f7d AS |
294 | /* called from workqueue */ |
295 | static void bpf_map_free_deferred(struct work_struct *work) | |
296 | { | |
297 | struct bpf_map *map = container_of(work, struct bpf_map, work); | |
298 | ||
0a4c58f5 | 299 | bpf_map_release_memlock(map); |
afdb09c7 | 300 | security_bpf_map_free(map); |
99c55f7d AS |
301 | /* implementation dependent freeing */ |
302 | map->ops->map_free(map); | |
303 | } | |
304 | ||
c9da161c DB |
305 | static void bpf_map_put_uref(struct bpf_map *map) |
306 | { | |
307 | if (atomic_dec_and_test(&map->usercnt)) { | |
ba6b8de4 JF |
308 | if (map->ops->map_release_uref) |
309 | map->ops->map_release_uref(map); | |
c9da161c DB |
310 | } |
311 | } | |
312 | ||
99c55f7d AS |
313 | /* decrement map refcnt and schedule it for freeing via workqueue |
314 | * (unrelying map implementation ops->map_free() might sleep) | |
315 | */ | |
bd5f5f4e | 316 | static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock) |
99c55f7d AS |
317 | { |
318 | if (atomic_dec_and_test(&map->refcnt)) { | |
34ad5580 | 319 | /* bpf_map_free_id() must be called first */ |
bd5f5f4e | 320 | bpf_map_free_id(map, do_idr_lock); |
78958fca | 321 | btf_put(map->btf); |
99c55f7d AS |
322 | INIT_WORK(&map->work, bpf_map_free_deferred); |
323 | schedule_work(&map->work); | |
324 | } | |
325 | } | |
326 | ||
bd5f5f4e MKL |
327 | void bpf_map_put(struct bpf_map *map) |
328 | { | |
329 | __bpf_map_put(map, true); | |
330 | } | |
630a4d38 | 331 | EXPORT_SYMBOL_GPL(bpf_map_put); |
bd5f5f4e | 332 | |
c9da161c | 333 | void bpf_map_put_with_uref(struct bpf_map *map) |
99c55f7d | 334 | { |
c9da161c | 335 | bpf_map_put_uref(map); |
99c55f7d | 336 | bpf_map_put(map); |
c9da161c DB |
337 | } |
338 | ||
339 | static int bpf_map_release(struct inode *inode, struct file *filp) | |
340 | { | |
61d1b6a4 DB |
341 | struct bpf_map *map = filp->private_data; |
342 | ||
343 | if (map->ops->map_release) | |
344 | map->ops->map_release(map, filp); | |
345 | ||
346 | bpf_map_put_with_uref(map); | |
99c55f7d AS |
347 | return 0; |
348 | } | |
349 | ||
87df15de DB |
350 | static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f) |
351 | { | |
352 | fmode_t mode = f.file->f_mode; | |
353 | ||
354 | /* Our file permissions may have been overridden by global | |
355 | * map permissions facing syscall side. | |
356 | */ | |
357 | if (READ_ONCE(map->frozen)) | |
358 | mode &= ~FMODE_CAN_WRITE; | |
359 | return mode; | |
360 | } | |
361 | ||
f99bf205 DB |
362 | #ifdef CONFIG_PROC_FS |
363 | static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) | |
364 | { | |
365 | const struct bpf_map *map = filp->private_data; | |
21116b70 DB |
366 | const struct bpf_array *array; |
367 | u32 owner_prog_type = 0; | |
9780c0ab | 368 | u32 owner_jited = 0; |
21116b70 DB |
369 | |
370 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { | |
371 | array = container_of(map, struct bpf_array, map); | |
372 | owner_prog_type = array->owner_prog_type; | |
9780c0ab | 373 | owner_jited = array->owner_jited; |
21116b70 | 374 | } |
f99bf205 DB |
375 | |
376 | seq_printf(m, | |
377 | "map_type:\t%u\n" | |
378 | "key_size:\t%u\n" | |
379 | "value_size:\t%u\n" | |
322cea2f | 380 | "max_entries:\t%u\n" |
21116b70 | 381 | "map_flags:\t%#x\n" |
4316b409 | 382 | "memlock:\t%llu\n" |
87df15de DB |
383 | "map_id:\t%u\n" |
384 | "frozen:\t%u\n", | |
f99bf205 DB |
385 | map->map_type, |
386 | map->key_size, | |
387 | map->value_size, | |
322cea2f | 388 | map->max_entries, |
21116b70 | 389 | map->map_flags, |
4316b409 | 390 | map->pages * 1ULL << PAGE_SHIFT, |
87df15de DB |
391 | map->id, |
392 | READ_ONCE(map->frozen)); | |
21116b70 | 393 | |
9780c0ab | 394 | if (owner_prog_type) { |
21116b70 DB |
395 | seq_printf(m, "owner_prog_type:\t%u\n", |
396 | owner_prog_type); | |
9780c0ab DB |
397 | seq_printf(m, "owner_jited:\t%u\n", |
398 | owner_jited); | |
399 | } | |
f99bf205 DB |
400 | } |
401 | #endif | |
402 | ||
6e71b04a CF |
403 | static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz, |
404 | loff_t *ppos) | |
405 | { | |
406 | /* We need this handler such that alloc_file() enables | |
407 | * f_mode with FMODE_CAN_READ. | |
408 | */ | |
409 | return -EINVAL; | |
410 | } | |
411 | ||
412 | static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf, | |
413 | size_t siz, loff_t *ppos) | |
414 | { | |
415 | /* We need this handler such that alloc_file() enables | |
416 | * f_mode with FMODE_CAN_WRITE. | |
417 | */ | |
418 | return -EINVAL; | |
419 | } | |
420 | ||
f66e448c | 421 | const struct file_operations bpf_map_fops = { |
f99bf205 DB |
422 | #ifdef CONFIG_PROC_FS |
423 | .show_fdinfo = bpf_map_show_fdinfo, | |
424 | #endif | |
425 | .release = bpf_map_release, | |
6e71b04a CF |
426 | .read = bpf_dummy_read, |
427 | .write = bpf_dummy_write, | |
99c55f7d AS |
428 | }; |
429 | ||
6e71b04a | 430 | int bpf_map_new_fd(struct bpf_map *map, int flags) |
aa79781b | 431 | { |
afdb09c7 CF |
432 | int ret; |
433 | ||
434 | ret = security_bpf_map(map, OPEN_FMODE(flags)); | |
435 | if (ret < 0) | |
436 | return ret; | |
437 | ||
aa79781b | 438 | return anon_inode_getfd("bpf-map", &bpf_map_fops, map, |
6e71b04a CF |
439 | flags | O_CLOEXEC); |
440 | } | |
441 | ||
442 | int bpf_get_file_flag(int flags) | |
443 | { | |
444 | if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY)) | |
445 | return -EINVAL; | |
446 | if (flags & BPF_F_RDONLY) | |
447 | return O_RDONLY; | |
448 | if (flags & BPF_F_WRONLY) | |
449 | return O_WRONLY; | |
450 | return O_RDWR; | |
aa79781b DB |
451 | } |
452 | ||
99c55f7d AS |
453 | /* helper macro to check that unused fields 'union bpf_attr' are zero */ |
454 | #define CHECK_ATTR(CMD) \ | |
455 | memchr_inv((void *) &attr->CMD##_LAST_FIELD + \ | |
456 | sizeof(attr->CMD##_LAST_FIELD), 0, \ | |
457 | sizeof(*attr) - \ | |
458 | offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ | |
459 | sizeof(attr->CMD##_LAST_FIELD)) != NULL | |
460 | ||
cb4d2b3f MKL |
461 | /* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes. |
462 | * Return 0 on success and < 0 on error. | |
463 | */ | |
464 | static int bpf_obj_name_cpy(char *dst, const char *src) | |
465 | { | |
466 | const char *end = src + BPF_OBJ_NAME_LEN; | |
467 | ||
473d9734 | 468 | memset(dst, 0, BPF_OBJ_NAME_LEN); |
3e0ddc4f | 469 | /* Copy all isalnum(), '_' and '.' chars. */ |
cb4d2b3f | 470 | while (src < end && *src) { |
3e0ddc4f DB |
471 | if (!isalnum(*src) && |
472 | *src != '_' && *src != '.') | |
cb4d2b3f MKL |
473 | return -EINVAL; |
474 | *dst++ = *src++; | |
475 | } | |
476 | ||
477 | /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */ | |
478 | if (src == end) | |
479 | return -EINVAL; | |
480 | ||
cb4d2b3f MKL |
481 | return 0; |
482 | } | |
483 | ||
e8d2bec0 | 484 | int map_check_no_btf(const struct bpf_map *map, |
1b2b234b | 485 | const struct btf *btf, |
e8d2bec0 DB |
486 | const struct btf_type *key_type, |
487 | const struct btf_type *value_type) | |
488 | { | |
489 | return -ENOTSUPP; | |
490 | } | |
491 | ||
d83525ca | 492 | static int map_check_btf(struct bpf_map *map, const struct btf *btf, |
e8d2bec0 DB |
493 | u32 btf_key_id, u32 btf_value_id) |
494 | { | |
495 | const struct btf_type *key_type, *value_type; | |
496 | u32 key_size, value_size; | |
497 | int ret = 0; | |
498 | ||
2824ecb7 DB |
499 | /* Some maps allow key to be unspecified. */ |
500 | if (btf_key_id) { | |
501 | key_type = btf_type_id_size(btf, &btf_key_id, &key_size); | |
502 | if (!key_type || key_size != map->key_size) | |
503 | return -EINVAL; | |
504 | } else { | |
505 | key_type = btf_type_by_id(btf, 0); | |
506 | if (!map->ops->map_check_btf) | |
507 | return -EINVAL; | |
508 | } | |
e8d2bec0 DB |
509 | |
510 | value_type = btf_type_id_size(btf, &btf_value_id, &value_size); | |
511 | if (!value_type || value_size != map->value_size) | |
512 | return -EINVAL; | |
513 | ||
d83525ca AS |
514 | map->spin_lock_off = btf_find_spin_lock(btf, value_type); |
515 | ||
516 | if (map_value_has_spin_lock(map)) { | |
591fe988 DB |
517 | if (map->map_flags & BPF_F_RDONLY_PROG) |
518 | return -EACCES; | |
d83525ca | 519 | if (map->map_type != BPF_MAP_TYPE_HASH && |
e16d2f1a | 520 | map->map_type != BPF_MAP_TYPE_ARRAY && |
6ac99e8f MKL |
521 | map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE && |
522 | map->map_type != BPF_MAP_TYPE_SK_STORAGE) | |
d83525ca AS |
523 | return -ENOTSUPP; |
524 | if (map->spin_lock_off + sizeof(struct bpf_spin_lock) > | |
525 | map->value_size) { | |
526 | WARN_ONCE(1, | |
527 | "verifier bug spin_lock_off %d value_size %d\n", | |
528 | map->spin_lock_off, map->value_size); | |
529 | return -EFAULT; | |
530 | } | |
531 | } | |
532 | ||
e8d2bec0 | 533 | if (map->ops->map_check_btf) |
1b2b234b | 534 | ret = map->ops->map_check_btf(map, btf, key_type, value_type); |
e8d2bec0 DB |
535 | |
536 | return ret; | |
537 | } | |
538 | ||
9b2cf328 | 539 | #define BPF_MAP_CREATE_LAST_FIELD btf_value_type_id |
99c55f7d AS |
540 | /* called via syscall */ |
541 | static int map_create(union bpf_attr *attr) | |
542 | { | |
96eabe7a | 543 | int numa_node = bpf_map_attr_numa_node(attr); |
99c55f7d | 544 | struct bpf_map *map; |
6e71b04a | 545 | int f_flags; |
99c55f7d AS |
546 | int err; |
547 | ||
548 | err = CHECK_ATTR(BPF_MAP_CREATE); | |
549 | if (err) | |
550 | return -EINVAL; | |
551 | ||
6e71b04a CF |
552 | f_flags = bpf_get_file_flag(attr->map_flags); |
553 | if (f_flags < 0) | |
554 | return f_flags; | |
555 | ||
96eabe7a | 556 | if (numa_node != NUMA_NO_NODE && |
96e5ae4e ED |
557 | ((unsigned int)numa_node >= nr_node_ids || |
558 | !node_online(numa_node))) | |
96eabe7a MKL |
559 | return -EINVAL; |
560 | ||
99c55f7d AS |
561 | /* find map type and init map: hashtable vs rbtree vs bloom vs ... */ |
562 | map = find_and_alloc_map(attr); | |
563 | if (IS_ERR(map)) | |
564 | return PTR_ERR(map); | |
565 | ||
ad5b177b MKL |
566 | err = bpf_obj_name_cpy(map->name, attr->map_name); |
567 | if (err) | |
568 | goto free_map_nouncharge; | |
569 | ||
99c55f7d | 570 | atomic_set(&map->refcnt, 1); |
c9da161c | 571 | atomic_set(&map->usercnt, 1); |
99c55f7d | 572 | |
e8d2bec0 | 573 | if (attr->btf_key_type_id || attr->btf_value_type_id) { |
a26ca7c9 MKL |
574 | struct btf *btf; |
575 | ||
2824ecb7 | 576 | if (!attr->btf_value_type_id) { |
a26ca7c9 MKL |
577 | err = -EINVAL; |
578 | goto free_map_nouncharge; | |
579 | } | |
580 | ||
581 | btf = btf_get_by_fd(attr->btf_fd); | |
582 | if (IS_ERR(btf)) { | |
583 | err = PTR_ERR(btf); | |
584 | goto free_map_nouncharge; | |
585 | } | |
586 | ||
e8d2bec0 DB |
587 | err = map_check_btf(map, btf, attr->btf_key_type_id, |
588 | attr->btf_value_type_id); | |
a26ca7c9 MKL |
589 | if (err) { |
590 | btf_put(btf); | |
591 | goto free_map_nouncharge; | |
592 | } | |
593 | ||
594 | map->btf = btf; | |
9b2cf328 MKL |
595 | map->btf_key_type_id = attr->btf_key_type_id; |
596 | map->btf_value_type_id = attr->btf_value_type_id; | |
d83525ca AS |
597 | } else { |
598 | map->spin_lock_off = -EINVAL; | |
a26ca7c9 MKL |
599 | } |
600 | ||
afdb09c7 | 601 | err = security_bpf_map_alloc(map); |
aaac3ba9 | 602 | if (err) |
20b2b24f | 603 | goto free_map_nouncharge; |
aaac3ba9 | 604 | |
0a4c58f5 | 605 | err = bpf_map_init_memlock(map); |
afdb09c7 CF |
606 | if (err) |
607 | goto free_map_sec; | |
608 | ||
f3f1c054 MKL |
609 | err = bpf_map_alloc_id(map); |
610 | if (err) | |
611 | goto free_map; | |
612 | ||
6e71b04a | 613 | err = bpf_map_new_fd(map, f_flags); |
bd5f5f4e MKL |
614 | if (err < 0) { |
615 | /* failed to allocate fd. | |
352d20d6 | 616 | * bpf_map_put_with_uref() is needed because the above |
bd5f5f4e MKL |
617 | * bpf_map_alloc_id() has published the map |
618 | * to the userspace and the userspace may | |
619 | * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID. | |
620 | */ | |
352d20d6 | 621 | bpf_map_put_with_uref(map); |
bd5f5f4e MKL |
622 | return err; |
623 | } | |
99c55f7d AS |
624 | |
625 | return err; | |
626 | ||
627 | free_map: | |
0a4c58f5 | 628 | bpf_map_release_memlock(map); |
afdb09c7 CF |
629 | free_map_sec: |
630 | security_bpf_map_free(map); | |
20b2b24f | 631 | free_map_nouncharge: |
a26ca7c9 | 632 | btf_put(map->btf); |
99c55f7d AS |
633 | map->ops->map_free(map); |
634 | return err; | |
635 | } | |
636 | ||
db20fd2b AS |
637 | /* if error is returned, fd is released. |
638 | * On success caller should complete fd access with matching fdput() | |
639 | */ | |
c2101297 | 640 | struct bpf_map *__bpf_map_get(struct fd f) |
db20fd2b | 641 | { |
db20fd2b AS |
642 | if (!f.file) |
643 | return ERR_PTR(-EBADF); | |
db20fd2b AS |
644 | if (f.file->f_op != &bpf_map_fops) { |
645 | fdput(f); | |
646 | return ERR_PTR(-EINVAL); | |
647 | } | |
648 | ||
c2101297 DB |
649 | return f.file->private_data; |
650 | } | |
651 | ||
92117d84 AS |
652 | /* prog's and map's refcnt limit */ |
653 | #define BPF_MAX_REFCNT 32768 | |
654 | ||
655 | struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref) | |
c9da161c | 656 | { |
92117d84 AS |
657 | if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) { |
658 | atomic_dec(&map->refcnt); | |
659 | return ERR_PTR(-EBUSY); | |
660 | } | |
c9da161c DB |
661 | if (uref) |
662 | atomic_inc(&map->usercnt); | |
92117d84 | 663 | return map; |
c9da161c | 664 | } |
630a4d38 | 665 | EXPORT_SYMBOL_GPL(bpf_map_inc); |
c9da161c DB |
666 | |
667 | struct bpf_map *bpf_map_get_with_uref(u32 ufd) | |
c2101297 DB |
668 | { |
669 | struct fd f = fdget(ufd); | |
670 | struct bpf_map *map; | |
671 | ||
672 | map = __bpf_map_get(f); | |
673 | if (IS_ERR(map)) | |
674 | return map; | |
675 | ||
92117d84 | 676 | map = bpf_map_inc(map, true); |
c2101297 | 677 | fdput(f); |
db20fd2b AS |
678 | |
679 | return map; | |
680 | } | |
681 | ||
bd5f5f4e MKL |
682 | /* map_idr_lock should have been held */ |
683 | static struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map, | |
684 | bool uref) | |
685 | { | |
686 | int refold; | |
687 | ||
bfc18e38 | 688 | refold = atomic_fetch_add_unless(&map->refcnt, 1, 0); |
bd5f5f4e MKL |
689 | |
690 | if (refold >= BPF_MAX_REFCNT) { | |
691 | __bpf_map_put(map, false); | |
692 | return ERR_PTR(-EBUSY); | |
693 | } | |
694 | ||
695 | if (!refold) | |
696 | return ERR_PTR(-ENOENT); | |
697 | ||
698 | if (uref) | |
699 | atomic_inc(&map->usercnt); | |
700 | ||
701 | return map; | |
702 | } | |
703 | ||
b8cdc051 AS |
704 | int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) |
705 | { | |
706 | return -ENOTSUPP; | |
707 | } | |
708 | ||
c9d29f46 MV |
709 | static void *__bpf_copy_key(void __user *ukey, u64 key_size) |
710 | { | |
711 | if (key_size) | |
712 | return memdup_user(ukey, key_size); | |
713 | ||
714 | if (ukey) | |
715 | return ERR_PTR(-EINVAL); | |
716 | ||
717 | return NULL; | |
718 | } | |
719 | ||
db20fd2b | 720 | /* last field in 'union bpf_attr' used by this command */ |
96049f3a | 721 | #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags |
db20fd2b AS |
722 | |
723 | static int map_lookup_elem(union bpf_attr *attr) | |
724 | { | |
535e7b4b MS |
725 | void __user *ukey = u64_to_user_ptr(attr->key); |
726 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 727 | int ufd = attr->map_fd; |
db20fd2b | 728 | struct bpf_map *map; |
8ebe667c | 729 | void *key, *value, *ptr; |
15a07b33 | 730 | u32 value_size; |
592867bf | 731 | struct fd f; |
db20fd2b AS |
732 | int err; |
733 | ||
734 | if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) | |
735 | return -EINVAL; | |
736 | ||
96049f3a AS |
737 | if (attr->flags & ~BPF_F_LOCK) |
738 | return -EINVAL; | |
739 | ||
592867bf | 740 | f = fdget(ufd); |
c2101297 | 741 | map = __bpf_map_get(f); |
db20fd2b AS |
742 | if (IS_ERR(map)) |
743 | return PTR_ERR(map); | |
87df15de | 744 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) { |
6e71b04a CF |
745 | err = -EPERM; |
746 | goto err_put; | |
747 | } | |
748 | ||
96049f3a AS |
749 | if ((attr->flags & BPF_F_LOCK) && |
750 | !map_value_has_spin_lock(map)) { | |
751 | err = -EINVAL; | |
752 | goto err_put; | |
753 | } | |
754 | ||
c9d29f46 | 755 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
756 | if (IS_ERR(key)) { |
757 | err = PTR_ERR(key); | |
db20fd2b | 758 | goto err_put; |
e4448ed8 | 759 | } |
db20fd2b | 760 | |
15a07b33 | 761 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 762 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
b741f163 RG |
763 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || |
764 | map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) | |
15a07b33 | 765 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); |
14dc6f04 MKL |
766 | else if (IS_FD_MAP(map)) |
767 | value_size = sizeof(u32); | |
15a07b33 AS |
768 | else |
769 | value_size = map->value_size; | |
770 | ||
8ebe667c | 771 | err = -ENOMEM; |
15a07b33 | 772 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b | 773 | if (!value) |
8ebe667c AS |
774 | goto free_key; |
775 | ||
a3884572 JK |
776 | if (bpf_map_is_dev_bound(map)) { |
777 | err = bpf_map_offload_lookup_elem(map, key, value); | |
7c4cd051 MKL |
778 | goto done; |
779 | } | |
780 | ||
781 | preempt_disable(); | |
782 | this_cpu_inc(bpf_prog_active); | |
783 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || | |
784 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
785 | err = bpf_percpu_hash_copy(map, key, value); |
786 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
787 | err = bpf_percpu_array_copy(map, key, value); | |
b741f163 RG |
788 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { |
789 | err = bpf_percpu_cgroup_storage_copy(map, key, value); | |
557c0c6e AS |
790 | } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) { |
791 | err = bpf_stackmap_copy(map, key, value); | |
14dc6f04 MKL |
792 | } else if (IS_FD_ARRAY(map)) { |
793 | err = bpf_fd_array_map_lookup_elem(map, key, value); | |
794 | } else if (IS_FD_HASH(map)) { | |
795 | err = bpf_fd_htab_map_lookup_elem(map, key, value); | |
5dc4c4b7 MKL |
796 | } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { |
797 | err = bpf_fd_reuseport_array_lookup_elem(map, key, value); | |
f1a2e44a MV |
798 | } else if (map->map_type == BPF_MAP_TYPE_QUEUE || |
799 | map->map_type == BPF_MAP_TYPE_STACK) { | |
800 | err = map->ops->map_peek_elem(map, value); | |
15a07b33 AS |
801 | } else { |
802 | rcu_read_lock(); | |
c6110222 DB |
803 | if (map->ops->map_lookup_elem_sys_only) |
804 | ptr = map->ops->map_lookup_elem_sys_only(map, key); | |
805 | else | |
806 | ptr = map->ops->map_lookup_elem(map, key); | |
509db283 PB |
807 | if (IS_ERR(ptr)) { |
808 | err = PTR_ERR(ptr); | |
809 | } else if (!ptr) { | |
810 | err = -ENOENT; | |
811 | } else { | |
812 | err = 0; | |
96049f3a AS |
813 | if (attr->flags & BPF_F_LOCK) |
814 | /* lock 'ptr' and copy everything but lock */ | |
815 | copy_map_value_locked(map, value, ptr, true); | |
816 | else | |
817 | copy_map_value(map, value, ptr); | |
818 | /* mask lock, since value wasn't zero inited */ | |
819 | check_and_init_map_lock(map, value); | |
509db283 | 820 | } |
15a07b33 | 821 | rcu_read_unlock(); |
15a07b33 | 822 | } |
7c4cd051 MKL |
823 | this_cpu_dec(bpf_prog_active); |
824 | preempt_enable(); | |
8ebe667c | 825 | |
7c4cd051 | 826 | done: |
15a07b33 | 827 | if (err) |
8ebe667c | 828 | goto free_value; |
db20fd2b AS |
829 | |
830 | err = -EFAULT; | |
15a07b33 | 831 | if (copy_to_user(uvalue, value, value_size) != 0) |
8ebe667c | 832 | goto free_value; |
db20fd2b AS |
833 | |
834 | err = 0; | |
835 | ||
8ebe667c AS |
836 | free_value: |
837 | kfree(value); | |
db20fd2b AS |
838 | free_key: |
839 | kfree(key); | |
840 | err_put: | |
841 | fdput(f); | |
842 | return err; | |
843 | } | |
844 | ||
1ae80cf3 DC |
845 | static void maybe_wait_bpf_programs(struct bpf_map *map) |
846 | { | |
847 | /* Wait for any running BPF programs to complete so that | |
848 | * userspace, when we return to it, knows that all programs | |
849 | * that could be running use the new map value. | |
850 | */ | |
851 | if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS || | |
852 | map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) | |
853 | synchronize_rcu(); | |
854 | } | |
855 | ||
3274f520 | 856 | #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags |
db20fd2b AS |
857 | |
858 | static int map_update_elem(union bpf_attr *attr) | |
859 | { | |
535e7b4b MS |
860 | void __user *ukey = u64_to_user_ptr(attr->key); |
861 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 862 | int ufd = attr->map_fd; |
db20fd2b AS |
863 | struct bpf_map *map; |
864 | void *key, *value; | |
15a07b33 | 865 | u32 value_size; |
592867bf | 866 | struct fd f; |
db20fd2b AS |
867 | int err; |
868 | ||
869 | if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM)) | |
870 | return -EINVAL; | |
871 | ||
592867bf | 872 | f = fdget(ufd); |
c2101297 | 873 | map = __bpf_map_get(f); |
db20fd2b AS |
874 | if (IS_ERR(map)) |
875 | return PTR_ERR(map); | |
87df15de | 876 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
6e71b04a CF |
877 | err = -EPERM; |
878 | goto err_put; | |
879 | } | |
880 | ||
96049f3a AS |
881 | if ((attr->flags & BPF_F_LOCK) && |
882 | !map_value_has_spin_lock(map)) { | |
883 | err = -EINVAL; | |
884 | goto err_put; | |
885 | } | |
886 | ||
c9d29f46 | 887 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
888 | if (IS_ERR(key)) { |
889 | err = PTR_ERR(key); | |
db20fd2b | 890 | goto err_put; |
e4448ed8 | 891 | } |
db20fd2b | 892 | |
15a07b33 | 893 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 894 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
b741f163 RG |
895 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || |
896 | map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) | |
15a07b33 AS |
897 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); |
898 | else | |
899 | value_size = map->value_size; | |
900 | ||
db20fd2b | 901 | err = -ENOMEM; |
15a07b33 | 902 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b AS |
903 | if (!value) |
904 | goto free_key; | |
905 | ||
906 | err = -EFAULT; | |
15a07b33 | 907 | if (copy_from_user(value, uvalue, value_size) != 0) |
db20fd2b AS |
908 | goto free_value; |
909 | ||
6710e112 | 910 | /* Need to create a kthread, thus must support schedule */ |
a3884572 JK |
911 | if (bpf_map_is_dev_bound(map)) { |
912 | err = bpf_map_offload_update_elem(map, key, value, attr->flags); | |
913 | goto out; | |
99ba2b5a JF |
914 | } else if (map->map_type == BPF_MAP_TYPE_CPUMAP || |
915 | map->map_type == BPF_MAP_TYPE_SOCKHASH || | |
916 | map->map_type == BPF_MAP_TYPE_SOCKMAP) { | |
6710e112 JDB |
917 | err = map->ops->map_update_elem(map, key, value, attr->flags); |
918 | goto out; | |
919 | } | |
920 | ||
b121d1e7 AS |
921 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering from |
922 | * inside bpf map update or delete otherwise deadlocks are possible | |
923 | */ | |
924 | preempt_disable(); | |
925 | __this_cpu_inc(bpf_prog_active); | |
8f844938 MKL |
926 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
927 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
928 | err = bpf_percpu_hash_update(map, key, value, attr->flags); |
929 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
930 | err = bpf_percpu_array_update(map, key, value, attr->flags); | |
b741f163 RG |
931 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { |
932 | err = bpf_percpu_cgroup_storage_update(map, key, value, | |
933 | attr->flags); | |
9c147b56 | 934 | } else if (IS_FD_ARRAY(map)) { |
d056a788 DB |
935 | rcu_read_lock(); |
936 | err = bpf_fd_array_map_update_elem(map, f.file, key, value, | |
937 | attr->flags); | |
938 | rcu_read_unlock(); | |
bcc6b1b7 MKL |
939 | } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) { |
940 | rcu_read_lock(); | |
941 | err = bpf_fd_htab_map_update_elem(map, f.file, key, value, | |
942 | attr->flags); | |
943 | rcu_read_unlock(); | |
5dc4c4b7 MKL |
944 | } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { |
945 | /* rcu_read_lock() is not needed */ | |
946 | err = bpf_fd_reuseport_array_update_elem(map, key, value, | |
947 | attr->flags); | |
f1a2e44a MV |
948 | } else if (map->map_type == BPF_MAP_TYPE_QUEUE || |
949 | map->map_type == BPF_MAP_TYPE_STACK) { | |
950 | err = map->ops->map_push_elem(map, value, attr->flags); | |
15a07b33 AS |
951 | } else { |
952 | rcu_read_lock(); | |
953 | err = map->ops->map_update_elem(map, key, value, attr->flags); | |
954 | rcu_read_unlock(); | |
955 | } | |
b121d1e7 AS |
956 | __this_cpu_dec(bpf_prog_active); |
957 | preempt_enable(); | |
1ae80cf3 | 958 | maybe_wait_bpf_programs(map); |
6710e112 | 959 | out: |
db20fd2b AS |
960 | free_value: |
961 | kfree(value); | |
962 | free_key: | |
963 | kfree(key); | |
964 | err_put: | |
965 | fdput(f); | |
966 | return err; | |
967 | } | |
968 | ||
969 | #define BPF_MAP_DELETE_ELEM_LAST_FIELD key | |
970 | ||
971 | static int map_delete_elem(union bpf_attr *attr) | |
972 | { | |
535e7b4b | 973 | void __user *ukey = u64_to_user_ptr(attr->key); |
db20fd2b | 974 | int ufd = attr->map_fd; |
db20fd2b | 975 | struct bpf_map *map; |
592867bf | 976 | struct fd f; |
db20fd2b AS |
977 | void *key; |
978 | int err; | |
979 | ||
980 | if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) | |
981 | return -EINVAL; | |
982 | ||
592867bf | 983 | f = fdget(ufd); |
c2101297 | 984 | map = __bpf_map_get(f); |
db20fd2b AS |
985 | if (IS_ERR(map)) |
986 | return PTR_ERR(map); | |
87df15de | 987 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
6e71b04a CF |
988 | err = -EPERM; |
989 | goto err_put; | |
990 | } | |
991 | ||
c9d29f46 | 992 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
993 | if (IS_ERR(key)) { |
994 | err = PTR_ERR(key); | |
db20fd2b | 995 | goto err_put; |
e4448ed8 | 996 | } |
db20fd2b | 997 | |
a3884572 JK |
998 | if (bpf_map_is_dev_bound(map)) { |
999 | err = bpf_map_offload_delete_elem(map, key); | |
1000 | goto out; | |
1001 | } | |
1002 | ||
b121d1e7 AS |
1003 | preempt_disable(); |
1004 | __this_cpu_inc(bpf_prog_active); | |
db20fd2b AS |
1005 | rcu_read_lock(); |
1006 | err = map->ops->map_delete_elem(map, key); | |
1007 | rcu_read_unlock(); | |
b121d1e7 AS |
1008 | __this_cpu_dec(bpf_prog_active); |
1009 | preempt_enable(); | |
1ae80cf3 | 1010 | maybe_wait_bpf_programs(map); |
a3884572 | 1011 | out: |
db20fd2b AS |
1012 | kfree(key); |
1013 | err_put: | |
1014 | fdput(f); | |
1015 | return err; | |
1016 | } | |
1017 | ||
1018 | /* last field in 'union bpf_attr' used by this command */ | |
1019 | #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key | |
1020 | ||
1021 | static int map_get_next_key(union bpf_attr *attr) | |
1022 | { | |
535e7b4b MS |
1023 | void __user *ukey = u64_to_user_ptr(attr->key); |
1024 | void __user *unext_key = u64_to_user_ptr(attr->next_key); | |
db20fd2b | 1025 | int ufd = attr->map_fd; |
db20fd2b AS |
1026 | struct bpf_map *map; |
1027 | void *key, *next_key; | |
592867bf | 1028 | struct fd f; |
db20fd2b AS |
1029 | int err; |
1030 | ||
1031 | if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) | |
1032 | return -EINVAL; | |
1033 | ||
592867bf | 1034 | f = fdget(ufd); |
c2101297 | 1035 | map = __bpf_map_get(f); |
db20fd2b AS |
1036 | if (IS_ERR(map)) |
1037 | return PTR_ERR(map); | |
87df15de | 1038 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) { |
6e71b04a CF |
1039 | err = -EPERM; |
1040 | goto err_put; | |
1041 | } | |
1042 | ||
8fe45924 | 1043 | if (ukey) { |
c9d29f46 | 1044 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
1045 | if (IS_ERR(key)) { |
1046 | err = PTR_ERR(key); | |
8fe45924 | 1047 | goto err_put; |
e4448ed8 | 1048 | } |
8fe45924 TQ |
1049 | } else { |
1050 | key = NULL; | |
1051 | } | |
db20fd2b AS |
1052 | |
1053 | err = -ENOMEM; | |
1054 | next_key = kmalloc(map->key_size, GFP_USER); | |
1055 | if (!next_key) | |
1056 | goto free_key; | |
1057 | ||
a3884572 JK |
1058 | if (bpf_map_is_dev_bound(map)) { |
1059 | err = bpf_map_offload_get_next_key(map, key, next_key); | |
1060 | goto out; | |
1061 | } | |
1062 | ||
db20fd2b AS |
1063 | rcu_read_lock(); |
1064 | err = map->ops->map_get_next_key(map, key, next_key); | |
1065 | rcu_read_unlock(); | |
a3884572 | 1066 | out: |
db20fd2b AS |
1067 | if (err) |
1068 | goto free_next_key; | |
1069 | ||
1070 | err = -EFAULT; | |
1071 | if (copy_to_user(unext_key, next_key, map->key_size) != 0) | |
1072 | goto free_next_key; | |
1073 | ||
1074 | err = 0; | |
1075 | ||
1076 | free_next_key: | |
1077 | kfree(next_key); | |
1078 | free_key: | |
1079 | kfree(key); | |
1080 | err_put: | |
1081 | fdput(f); | |
1082 | return err; | |
1083 | } | |
1084 | ||
bd513cd0 MV |
1085 | #define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value |
1086 | ||
1087 | static int map_lookup_and_delete_elem(union bpf_attr *attr) | |
1088 | { | |
1089 | void __user *ukey = u64_to_user_ptr(attr->key); | |
1090 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
1091 | int ufd = attr->map_fd; | |
1092 | struct bpf_map *map; | |
540fefc0 | 1093 | void *key, *value; |
bd513cd0 MV |
1094 | u32 value_size; |
1095 | struct fd f; | |
1096 | int err; | |
1097 | ||
1098 | if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM)) | |
1099 | return -EINVAL; | |
1100 | ||
1101 | f = fdget(ufd); | |
1102 | map = __bpf_map_get(f); | |
1103 | if (IS_ERR(map)) | |
1104 | return PTR_ERR(map); | |
87df15de | 1105 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
bd513cd0 MV |
1106 | err = -EPERM; |
1107 | goto err_put; | |
1108 | } | |
1109 | ||
1110 | key = __bpf_copy_key(ukey, map->key_size); | |
1111 | if (IS_ERR(key)) { | |
1112 | err = PTR_ERR(key); | |
1113 | goto err_put; | |
1114 | } | |
1115 | ||
1116 | value_size = map->value_size; | |
1117 | ||
1118 | err = -ENOMEM; | |
1119 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); | |
1120 | if (!value) | |
1121 | goto free_key; | |
1122 | ||
1123 | if (map->map_type == BPF_MAP_TYPE_QUEUE || | |
1124 | map->map_type == BPF_MAP_TYPE_STACK) { | |
1125 | err = map->ops->map_pop_elem(map, value); | |
1126 | } else { | |
1127 | err = -ENOTSUPP; | |
1128 | } | |
1129 | ||
1130 | if (err) | |
1131 | goto free_value; | |
1132 | ||
1133 | if (copy_to_user(uvalue, value, value_size) != 0) | |
1134 | goto free_value; | |
1135 | ||
1136 | err = 0; | |
1137 | ||
1138 | free_value: | |
1139 | kfree(value); | |
1140 | free_key: | |
1141 | kfree(key); | |
1142 | err_put: | |
1143 | fdput(f); | |
1144 | return err; | |
1145 | } | |
1146 | ||
87df15de DB |
1147 | #define BPF_MAP_FREEZE_LAST_FIELD map_fd |
1148 | ||
1149 | static int map_freeze(const union bpf_attr *attr) | |
1150 | { | |
1151 | int err = 0, ufd = attr->map_fd; | |
1152 | struct bpf_map *map; | |
1153 | struct fd f; | |
1154 | ||
1155 | if (CHECK_ATTR(BPF_MAP_FREEZE)) | |
1156 | return -EINVAL; | |
1157 | ||
1158 | f = fdget(ufd); | |
1159 | map = __bpf_map_get(f); | |
1160 | if (IS_ERR(map)) | |
1161 | return PTR_ERR(map); | |
1162 | if (READ_ONCE(map->frozen)) { | |
1163 | err = -EBUSY; | |
1164 | goto err_put; | |
1165 | } | |
1166 | if (!capable(CAP_SYS_ADMIN)) { | |
1167 | err = -EPERM; | |
1168 | goto err_put; | |
1169 | } | |
1170 | ||
1171 | WRITE_ONCE(map->frozen, true); | |
1172 | err_put: | |
1173 | fdput(f); | |
1174 | return err; | |
1175 | } | |
1176 | ||
7de16e3a JK |
1177 | static const struct bpf_prog_ops * const bpf_prog_types[] = { |
1178 | #define BPF_PROG_TYPE(_id, _name) \ | |
1179 | [_id] = & _name ## _prog_ops, | |
1180 | #define BPF_MAP_TYPE(_id, _ops) | |
1181 | #include <linux/bpf_types.h> | |
1182 | #undef BPF_PROG_TYPE | |
1183 | #undef BPF_MAP_TYPE | |
1184 | }; | |
1185 | ||
09756af4 AS |
1186 | static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) |
1187 | { | |
d0f1a451 DB |
1188 | const struct bpf_prog_ops *ops; |
1189 | ||
1190 | if (type >= ARRAY_SIZE(bpf_prog_types)) | |
1191 | return -EINVAL; | |
1192 | type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types)); | |
1193 | ops = bpf_prog_types[type]; | |
1194 | if (!ops) | |
be9370a7 | 1195 | return -EINVAL; |
09756af4 | 1196 | |
ab3f0063 | 1197 | if (!bpf_prog_is_dev_bound(prog->aux)) |
d0f1a451 | 1198 | prog->aux->ops = ops; |
ab3f0063 JK |
1199 | else |
1200 | prog->aux->ops = &bpf_offload_prog_ops; | |
be9370a7 JB |
1201 | prog->type = type; |
1202 | return 0; | |
09756af4 AS |
1203 | } |
1204 | ||
1205 | /* drop refcnt on maps used by eBPF program and free auxilary data */ | |
1206 | static void free_used_maps(struct bpf_prog_aux *aux) | |
1207 | { | |
8bad74f9 | 1208 | enum bpf_cgroup_storage_type stype; |
09756af4 AS |
1209 | int i; |
1210 | ||
8bad74f9 RG |
1211 | for_each_cgroup_storage_type(stype) { |
1212 | if (!aux->cgroup_storage[stype]) | |
1213 | continue; | |
1214 | bpf_cgroup_storage_release(aux->prog, | |
1215 | aux->cgroup_storage[stype]); | |
1216 | } | |
de9cbbaa | 1217 | |
09756af4 AS |
1218 | for (i = 0; i < aux->used_map_cnt; i++) |
1219 | bpf_map_put(aux->used_maps[i]); | |
1220 | ||
1221 | kfree(aux->used_maps); | |
1222 | } | |
1223 | ||
5ccb071e DB |
1224 | int __bpf_prog_charge(struct user_struct *user, u32 pages) |
1225 | { | |
1226 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
1227 | unsigned long user_bufs; | |
1228 | ||
1229 | if (user) { | |
1230 | user_bufs = atomic_long_add_return(pages, &user->locked_vm); | |
1231 | if (user_bufs > memlock_limit) { | |
1232 | atomic_long_sub(pages, &user->locked_vm); | |
1233 | return -EPERM; | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | void __bpf_prog_uncharge(struct user_struct *user, u32 pages) | |
1241 | { | |
1242 | if (user) | |
1243 | atomic_long_sub(pages, &user->locked_vm); | |
1244 | } | |
1245 | ||
aaac3ba9 AS |
1246 | static int bpf_prog_charge_memlock(struct bpf_prog *prog) |
1247 | { | |
1248 | struct user_struct *user = get_current_user(); | |
5ccb071e | 1249 | int ret; |
aaac3ba9 | 1250 | |
5ccb071e DB |
1251 | ret = __bpf_prog_charge(user, prog->pages); |
1252 | if (ret) { | |
aaac3ba9 | 1253 | free_uid(user); |
5ccb071e | 1254 | return ret; |
aaac3ba9 | 1255 | } |
5ccb071e | 1256 | |
aaac3ba9 AS |
1257 | prog->aux->user = user; |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) | |
1262 | { | |
1263 | struct user_struct *user = prog->aux->user; | |
1264 | ||
5ccb071e | 1265 | __bpf_prog_uncharge(user, prog->pages); |
aaac3ba9 AS |
1266 | free_uid(user); |
1267 | } | |
1268 | ||
dc4bb0e2 MKL |
1269 | static int bpf_prog_alloc_id(struct bpf_prog *prog) |
1270 | { | |
1271 | int id; | |
1272 | ||
b76354cd | 1273 | idr_preload(GFP_KERNEL); |
dc4bb0e2 MKL |
1274 | spin_lock_bh(&prog_idr_lock); |
1275 | id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC); | |
1276 | if (id > 0) | |
1277 | prog->aux->id = id; | |
1278 | spin_unlock_bh(&prog_idr_lock); | |
b76354cd | 1279 | idr_preload_end(); |
dc4bb0e2 MKL |
1280 | |
1281 | /* id is in [1, INT_MAX) */ | |
1282 | if (WARN_ON_ONCE(!id)) | |
1283 | return -ENOSPC; | |
1284 | ||
1285 | return id > 0 ? 0 : id; | |
1286 | } | |
1287 | ||
ad8ad79f | 1288 | void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock) |
dc4bb0e2 | 1289 | { |
ad8ad79f JK |
1290 | /* cBPF to eBPF migrations are currently not in the idr store. |
1291 | * Offloaded programs are removed from the store when their device | |
1292 | * disappears - even if someone grabs an fd to them they are unusable, | |
1293 | * simply waiting for refcnt to drop to be freed. | |
1294 | */ | |
dc4bb0e2 MKL |
1295 | if (!prog->aux->id) |
1296 | return; | |
1297 | ||
b16d9aa4 MKL |
1298 | if (do_idr_lock) |
1299 | spin_lock_bh(&prog_idr_lock); | |
1300 | else | |
1301 | __acquire(&prog_idr_lock); | |
1302 | ||
dc4bb0e2 | 1303 | idr_remove(&prog_idr, prog->aux->id); |
ad8ad79f | 1304 | prog->aux->id = 0; |
b16d9aa4 MKL |
1305 | |
1306 | if (do_idr_lock) | |
1307 | spin_unlock_bh(&prog_idr_lock); | |
1308 | else | |
1309 | __release(&prog_idr_lock); | |
dc4bb0e2 MKL |
1310 | } |
1311 | ||
1aacde3d | 1312 | static void __bpf_prog_put_rcu(struct rcu_head *rcu) |
abf2e7d6 AS |
1313 | { |
1314 | struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); | |
1315 | ||
1316 | free_used_maps(aux); | |
aaac3ba9 | 1317 | bpf_prog_uncharge_memlock(aux->prog); |
afdb09c7 | 1318 | security_bpf_prog_free(aux); |
abf2e7d6 AS |
1319 | bpf_prog_free(aux->prog); |
1320 | } | |
1321 | ||
b16d9aa4 | 1322 | static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) |
09756af4 | 1323 | { |
a67edbf4 | 1324 | if (atomic_dec_and_test(&prog->aux->refcnt)) { |
6ee52e2a | 1325 | perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0); |
34ad5580 | 1326 | /* bpf_prog_free_id() must be called first */ |
b16d9aa4 | 1327 | bpf_prog_free_id(prog, do_idr_lock); |
7d1982b4 | 1328 | bpf_prog_kallsyms_del_all(prog); |
838e9690 | 1329 | btf_put(prog->aux->btf); |
ba64e7d8 | 1330 | kvfree(prog->aux->func_info); |
c454a46b | 1331 | bpf_prog_free_linfo(prog); |
4f74d809 | 1332 | |
1aacde3d | 1333 | call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); |
a67edbf4 | 1334 | } |
09756af4 | 1335 | } |
b16d9aa4 MKL |
1336 | |
1337 | void bpf_prog_put(struct bpf_prog *prog) | |
1338 | { | |
1339 | __bpf_prog_put(prog, true); | |
1340 | } | |
e2e9b654 | 1341 | EXPORT_SYMBOL_GPL(bpf_prog_put); |
09756af4 AS |
1342 | |
1343 | static int bpf_prog_release(struct inode *inode, struct file *filp) | |
1344 | { | |
1345 | struct bpf_prog *prog = filp->private_data; | |
1346 | ||
1aacde3d | 1347 | bpf_prog_put(prog); |
09756af4 AS |
1348 | return 0; |
1349 | } | |
1350 | ||
492ecee8 AS |
1351 | static void bpf_prog_get_stats(const struct bpf_prog *prog, |
1352 | struct bpf_prog_stats *stats) | |
1353 | { | |
1354 | u64 nsecs = 0, cnt = 0; | |
1355 | int cpu; | |
1356 | ||
1357 | for_each_possible_cpu(cpu) { | |
1358 | const struct bpf_prog_stats *st; | |
1359 | unsigned int start; | |
1360 | u64 tnsecs, tcnt; | |
1361 | ||
1362 | st = per_cpu_ptr(prog->aux->stats, cpu); | |
1363 | do { | |
1364 | start = u64_stats_fetch_begin_irq(&st->syncp); | |
1365 | tnsecs = st->nsecs; | |
1366 | tcnt = st->cnt; | |
1367 | } while (u64_stats_fetch_retry_irq(&st->syncp, start)); | |
1368 | nsecs += tnsecs; | |
1369 | cnt += tcnt; | |
1370 | } | |
1371 | stats->nsecs = nsecs; | |
1372 | stats->cnt = cnt; | |
1373 | } | |
1374 | ||
7bd509e3 DB |
1375 | #ifdef CONFIG_PROC_FS |
1376 | static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) | |
1377 | { | |
1378 | const struct bpf_prog *prog = filp->private_data; | |
f1f7714e | 1379 | char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; |
492ecee8 | 1380 | struct bpf_prog_stats stats; |
7bd509e3 | 1381 | |
492ecee8 | 1382 | bpf_prog_get_stats(prog, &stats); |
f1f7714e | 1383 | bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); |
7bd509e3 DB |
1384 | seq_printf(m, |
1385 | "prog_type:\t%u\n" | |
1386 | "prog_jited:\t%u\n" | |
f1f7714e | 1387 | "prog_tag:\t%s\n" |
4316b409 | 1388 | "memlock:\t%llu\n" |
492ecee8 AS |
1389 | "prog_id:\t%u\n" |
1390 | "run_time_ns:\t%llu\n" | |
1391 | "run_cnt:\t%llu\n", | |
7bd509e3 DB |
1392 | prog->type, |
1393 | prog->jited, | |
f1f7714e | 1394 | prog_tag, |
4316b409 | 1395 | prog->pages * 1ULL << PAGE_SHIFT, |
492ecee8 AS |
1396 | prog->aux->id, |
1397 | stats.nsecs, | |
1398 | stats.cnt); | |
7bd509e3 DB |
1399 | } |
1400 | #endif | |
1401 | ||
f66e448c | 1402 | const struct file_operations bpf_prog_fops = { |
7bd509e3 DB |
1403 | #ifdef CONFIG_PROC_FS |
1404 | .show_fdinfo = bpf_prog_show_fdinfo, | |
1405 | #endif | |
1406 | .release = bpf_prog_release, | |
6e71b04a CF |
1407 | .read = bpf_dummy_read, |
1408 | .write = bpf_dummy_write, | |
09756af4 AS |
1409 | }; |
1410 | ||
b2197755 | 1411 | int bpf_prog_new_fd(struct bpf_prog *prog) |
aa79781b | 1412 | { |
afdb09c7 CF |
1413 | int ret; |
1414 | ||
1415 | ret = security_bpf_prog(prog); | |
1416 | if (ret < 0) | |
1417 | return ret; | |
1418 | ||
aa79781b DB |
1419 | return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, |
1420 | O_RDWR | O_CLOEXEC); | |
1421 | } | |
1422 | ||
113214be | 1423 | static struct bpf_prog *____bpf_prog_get(struct fd f) |
09756af4 | 1424 | { |
09756af4 AS |
1425 | if (!f.file) |
1426 | return ERR_PTR(-EBADF); | |
09756af4 AS |
1427 | if (f.file->f_op != &bpf_prog_fops) { |
1428 | fdput(f); | |
1429 | return ERR_PTR(-EINVAL); | |
1430 | } | |
1431 | ||
c2101297 | 1432 | return f.file->private_data; |
09756af4 AS |
1433 | } |
1434 | ||
59d3656d | 1435 | struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) |
92117d84 | 1436 | { |
59d3656d BB |
1437 | if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { |
1438 | atomic_sub(i, &prog->aux->refcnt); | |
92117d84 AS |
1439 | return ERR_PTR(-EBUSY); |
1440 | } | |
1441 | return prog; | |
1442 | } | |
59d3656d BB |
1443 | EXPORT_SYMBOL_GPL(bpf_prog_add); |
1444 | ||
c540594f DB |
1445 | void bpf_prog_sub(struct bpf_prog *prog, int i) |
1446 | { | |
1447 | /* Only to be used for undoing previous bpf_prog_add() in some | |
1448 | * error path. We still know that another entity in our call | |
1449 | * path holds a reference to the program, thus atomic_sub() can | |
1450 | * be safely used in such cases! | |
1451 | */ | |
1452 | WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); | |
1453 | } | |
1454 | EXPORT_SYMBOL_GPL(bpf_prog_sub); | |
1455 | ||
59d3656d BB |
1456 | struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) |
1457 | { | |
1458 | return bpf_prog_add(prog, 1); | |
1459 | } | |
97bc402d | 1460 | EXPORT_SYMBOL_GPL(bpf_prog_inc); |
92117d84 | 1461 | |
b16d9aa4 | 1462 | /* prog_idr_lock should have been held */ |
a6f6df69 | 1463 | struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog) |
b16d9aa4 MKL |
1464 | { |
1465 | int refold; | |
1466 | ||
bfc18e38 | 1467 | refold = atomic_fetch_add_unless(&prog->aux->refcnt, 1, 0); |
b16d9aa4 MKL |
1468 | |
1469 | if (refold >= BPF_MAX_REFCNT) { | |
1470 | __bpf_prog_put(prog, false); | |
1471 | return ERR_PTR(-EBUSY); | |
1472 | } | |
1473 | ||
1474 | if (!refold) | |
1475 | return ERR_PTR(-ENOENT); | |
1476 | ||
1477 | return prog; | |
1478 | } | |
a6f6df69 | 1479 | EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero); |
b16d9aa4 | 1480 | |
040ee692 | 1481 | bool bpf_prog_get_ok(struct bpf_prog *prog, |
288b3de5 | 1482 | enum bpf_prog_type *attach_type, bool attach_drv) |
248f346f | 1483 | { |
288b3de5 JK |
1484 | /* not an attachment, just a refcount inc, always allow */ |
1485 | if (!attach_type) | |
1486 | return true; | |
248f346f JK |
1487 | |
1488 | if (prog->type != *attach_type) | |
1489 | return false; | |
288b3de5 | 1490 | if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv) |
248f346f JK |
1491 | return false; |
1492 | ||
1493 | return true; | |
1494 | } | |
1495 | ||
1496 | static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type, | |
288b3de5 | 1497 | bool attach_drv) |
09756af4 AS |
1498 | { |
1499 | struct fd f = fdget(ufd); | |
1500 | struct bpf_prog *prog; | |
1501 | ||
113214be | 1502 | prog = ____bpf_prog_get(f); |
09756af4 AS |
1503 | if (IS_ERR(prog)) |
1504 | return prog; | |
288b3de5 | 1505 | if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) { |
113214be DB |
1506 | prog = ERR_PTR(-EINVAL); |
1507 | goto out; | |
1508 | } | |
09756af4 | 1509 | |
92117d84 | 1510 | prog = bpf_prog_inc(prog); |
113214be | 1511 | out: |
09756af4 AS |
1512 | fdput(f); |
1513 | return prog; | |
1514 | } | |
113214be DB |
1515 | |
1516 | struct bpf_prog *bpf_prog_get(u32 ufd) | |
1517 | { | |
288b3de5 | 1518 | return __bpf_prog_get(ufd, NULL, false); |
113214be DB |
1519 | } |
1520 | ||
248f346f | 1521 | struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, |
288b3de5 | 1522 | bool attach_drv) |
248f346f | 1523 | { |
4d220ed0 | 1524 | return __bpf_prog_get(ufd, &type, attach_drv); |
248f346f | 1525 | } |
6c8dfe21 | 1526 | EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev); |
248f346f | 1527 | |
aac3fc32 AI |
1528 | /* Initially all BPF programs could be loaded w/o specifying |
1529 | * expected_attach_type. Later for some of them specifying expected_attach_type | |
1530 | * at load time became required so that program could be validated properly. | |
1531 | * Programs of types that are allowed to be loaded both w/ and w/o (for | |
1532 | * backward compatibility) expected_attach_type, should have the default attach | |
1533 | * type assigned to expected_attach_type for the latter case, so that it can be | |
1534 | * validated later at attach time. | |
1535 | * | |
1536 | * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if | |
1537 | * prog type requires it but has some attach types that have to be backward | |
1538 | * compatible. | |
1539 | */ | |
1540 | static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr) | |
1541 | { | |
1542 | switch (attr->prog_type) { | |
1543 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
1544 | /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't | |
1545 | * exist so checking for non-zero is the way to go here. | |
1546 | */ | |
1547 | if (!attr->expected_attach_type) | |
1548 | attr->expected_attach_type = | |
1549 | BPF_CGROUP_INET_SOCK_CREATE; | |
1550 | break; | |
1551 | } | |
1552 | } | |
1553 | ||
5e43f899 AI |
1554 | static int |
1555 | bpf_prog_load_check_attach_type(enum bpf_prog_type prog_type, | |
1556 | enum bpf_attach_type expected_attach_type) | |
1557 | { | |
4fbac77d | 1558 | switch (prog_type) { |
aac3fc32 AI |
1559 | case BPF_PROG_TYPE_CGROUP_SOCK: |
1560 | switch (expected_attach_type) { | |
1561 | case BPF_CGROUP_INET_SOCK_CREATE: | |
1562 | case BPF_CGROUP_INET4_POST_BIND: | |
1563 | case BPF_CGROUP_INET6_POST_BIND: | |
1564 | return 0; | |
1565 | default: | |
1566 | return -EINVAL; | |
1567 | } | |
4fbac77d AI |
1568 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: |
1569 | switch (expected_attach_type) { | |
1570 | case BPF_CGROUP_INET4_BIND: | |
1571 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
1572 | case BPF_CGROUP_INET4_CONNECT: |
1573 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
1574 | case BPF_CGROUP_UDP4_SENDMSG: |
1575 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
1576 | return 0; |
1577 | default: | |
1578 | return -EINVAL; | |
1579 | } | |
1580 | default: | |
1581 | return 0; | |
1582 | } | |
5e43f899 AI |
1583 | } |
1584 | ||
09756af4 | 1585 | /* last field in 'union bpf_attr' used by this command */ |
c454a46b | 1586 | #define BPF_PROG_LOAD_LAST_FIELD line_info_cnt |
09756af4 | 1587 | |
838e9690 | 1588 | static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) |
09756af4 AS |
1589 | { |
1590 | enum bpf_prog_type type = attr->prog_type; | |
1591 | struct bpf_prog *prog; | |
1592 | int err; | |
1593 | char license[128]; | |
1594 | bool is_gpl; | |
1595 | ||
1596 | if (CHECK_ATTR(BPF_PROG_LOAD)) | |
1597 | return -EINVAL; | |
1598 | ||
e9ee9efc | 1599 | if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT | BPF_F_ANY_ALIGNMENT)) |
e07b98d9 DM |
1600 | return -EINVAL; |
1601 | ||
e9ee9efc DM |
1602 | if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && |
1603 | (attr->prog_flags & BPF_F_ANY_ALIGNMENT) && | |
1604 | !capable(CAP_SYS_ADMIN)) | |
1605 | return -EPERM; | |
1606 | ||
09756af4 | 1607 | /* copy eBPF program license from user space */ |
535e7b4b | 1608 | if (strncpy_from_user(license, u64_to_user_ptr(attr->license), |
09756af4 AS |
1609 | sizeof(license) - 1) < 0) |
1610 | return -EFAULT; | |
1611 | license[sizeof(license) - 1] = 0; | |
1612 | ||
1613 | /* eBPF programs must be GPL compatible to use GPL-ed functions */ | |
1614 | is_gpl = license_is_gpl_compatible(license); | |
1615 | ||
c04c0d2b AS |
1616 | if (attr->insn_cnt == 0 || |
1617 | attr->insn_cnt > (capable(CAP_SYS_ADMIN) ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS)) | |
ef0915ca | 1618 | return -E2BIG; |
80b7d819 CF |
1619 | if (type != BPF_PROG_TYPE_SOCKET_FILTER && |
1620 | type != BPF_PROG_TYPE_CGROUP_SKB && | |
1621 | !capable(CAP_SYS_ADMIN)) | |
1be7f75d AS |
1622 | return -EPERM; |
1623 | ||
aac3fc32 | 1624 | bpf_prog_load_fixup_attach_type(attr); |
5e43f899 AI |
1625 | if (bpf_prog_load_check_attach_type(type, attr->expected_attach_type)) |
1626 | return -EINVAL; | |
1627 | ||
09756af4 AS |
1628 | /* plain bpf_prog allocation */ |
1629 | prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); | |
1630 | if (!prog) | |
1631 | return -ENOMEM; | |
1632 | ||
5e43f899 AI |
1633 | prog->expected_attach_type = attr->expected_attach_type; |
1634 | ||
9a18eedb JK |
1635 | prog->aux->offload_requested = !!attr->prog_ifindex; |
1636 | ||
afdb09c7 | 1637 | err = security_bpf_prog_alloc(prog->aux); |
aaac3ba9 AS |
1638 | if (err) |
1639 | goto free_prog_nouncharge; | |
1640 | ||
afdb09c7 CF |
1641 | err = bpf_prog_charge_memlock(prog); |
1642 | if (err) | |
1643 | goto free_prog_sec; | |
1644 | ||
09756af4 AS |
1645 | prog->len = attr->insn_cnt; |
1646 | ||
1647 | err = -EFAULT; | |
535e7b4b | 1648 | if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), |
aafe6ae9 | 1649 | bpf_prog_insn_size(prog)) != 0) |
09756af4 AS |
1650 | goto free_prog; |
1651 | ||
1652 | prog->orig_prog = NULL; | |
a91263d5 | 1653 | prog->jited = 0; |
09756af4 AS |
1654 | |
1655 | atomic_set(&prog->aux->refcnt, 1); | |
a91263d5 | 1656 | prog->gpl_compatible = is_gpl ? 1 : 0; |
09756af4 | 1657 | |
9a18eedb | 1658 | if (bpf_prog_is_dev_bound(prog->aux)) { |
ab3f0063 JK |
1659 | err = bpf_prog_offload_init(prog, attr); |
1660 | if (err) | |
1661 | goto free_prog; | |
1662 | } | |
1663 | ||
09756af4 AS |
1664 | /* find program type: socket_filter vs tracing_filter */ |
1665 | err = find_prog_type(type, prog); | |
1666 | if (err < 0) | |
1667 | goto free_prog; | |
1668 | ||
cb4d2b3f MKL |
1669 | prog->aux->load_time = ktime_get_boot_ns(); |
1670 | err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name); | |
1671 | if (err) | |
1672 | goto free_prog; | |
1673 | ||
09756af4 | 1674 | /* run eBPF verifier */ |
838e9690 | 1675 | err = bpf_check(&prog, attr, uattr); |
09756af4 AS |
1676 | if (err < 0) |
1677 | goto free_used_maps; | |
1678 | ||
9facc336 | 1679 | prog = bpf_prog_select_runtime(prog, &err); |
04fd61ab AS |
1680 | if (err < 0) |
1681 | goto free_used_maps; | |
09756af4 | 1682 | |
dc4bb0e2 MKL |
1683 | err = bpf_prog_alloc_id(prog); |
1684 | if (err) | |
1685 | goto free_used_maps; | |
1686 | ||
aa79781b | 1687 | err = bpf_prog_new_fd(prog); |
b16d9aa4 MKL |
1688 | if (err < 0) { |
1689 | /* failed to allocate fd. | |
1690 | * bpf_prog_put() is needed because the above | |
1691 | * bpf_prog_alloc_id() has published the prog | |
1692 | * to the userspace and the userspace may | |
1693 | * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID. | |
1694 | */ | |
1695 | bpf_prog_put(prog); | |
1696 | return err; | |
1697 | } | |
09756af4 | 1698 | |
74451e66 | 1699 | bpf_prog_kallsyms_add(prog); |
6ee52e2a | 1700 | perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0); |
09756af4 AS |
1701 | return err; |
1702 | ||
1703 | free_used_maps: | |
c454a46b | 1704 | bpf_prog_free_linfo(prog); |
5482e9a9 MKL |
1705 | kvfree(prog->aux->func_info); |
1706 | btf_put(prog->aux->btf); | |
7d1982b4 | 1707 | bpf_prog_kallsyms_del_subprogs(prog); |
09756af4 AS |
1708 | free_used_maps(prog->aux); |
1709 | free_prog: | |
aaac3ba9 | 1710 | bpf_prog_uncharge_memlock(prog); |
afdb09c7 CF |
1711 | free_prog_sec: |
1712 | security_bpf_prog_free(prog->aux); | |
aaac3ba9 | 1713 | free_prog_nouncharge: |
09756af4 AS |
1714 | bpf_prog_free(prog); |
1715 | return err; | |
1716 | } | |
1717 | ||
6e71b04a | 1718 | #define BPF_OBJ_LAST_FIELD file_flags |
b2197755 DB |
1719 | |
1720 | static int bpf_obj_pin(const union bpf_attr *attr) | |
1721 | { | |
6e71b04a | 1722 | if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0) |
b2197755 DB |
1723 | return -EINVAL; |
1724 | ||
535e7b4b | 1725 | return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
1726 | } |
1727 | ||
1728 | static int bpf_obj_get(const union bpf_attr *attr) | |
1729 | { | |
6e71b04a CF |
1730 | if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 || |
1731 | attr->file_flags & ~BPF_OBJ_FLAG_MASK) | |
b2197755 DB |
1732 | return -EINVAL; |
1733 | ||
6e71b04a CF |
1734 | return bpf_obj_get_user(u64_to_user_ptr(attr->pathname), |
1735 | attr->file_flags); | |
b2197755 DB |
1736 | } |
1737 | ||
c4f6699d AS |
1738 | struct bpf_raw_tracepoint { |
1739 | struct bpf_raw_event_map *btp; | |
1740 | struct bpf_prog *prog; | |
1741 | }; | |
1742 | ||
1743 | static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp) | |
1744 | { | |
1745 | struct bpf_raw_tracepoint *raw_tp = filp->private_data; | |
1746 | ||
1747 | if (raw_tp->prog) { | |
1748 | bpf_probe_unregister(raw_tp->btp, raw_tp->prog); | |
1749 | bpf_prog_put(raw_tp->prog); | |
1750 | } | |
a38d1107 | 1751 | bpf_put_raw_tracepoint(raw_tp->btp); |
c4f6699d AS |
1752 | kfree(raw_tp); |
1753 | return 0; | |
1754 | } | |
1755 | ||
1756 | static const struct file_operations bpf_raw_tp_fops = { | |
1757 | .release = bpf_raw_tracepoint_release, | |
1758 | .read = bpf_dummy_read, | |
1759 | .write = bpf_dummy_write, | |
1760 | }; | |
1761 | ||
1762 | #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd | |
1763 | ||
1764 | static int bpf_raw_tracepoint_open(const union bpf_attr *attr) | |
1765 | { | |
1766 | struct bpf_raw_tracepoint *raw_tp; | |
1767 | struct bpf_raw_event_map *btp; | |
1768 | struct bpf_prog *prog; | |
1769 | char tp_name[128]; | |
1770 | int tp_fd, err; | |
1771 | ||
1772 | if (strncpy_from_user(tp_name, u64_to_user_ptr(attr->raw_tracepoint.name), | |
1773 | sizeof(tp_name) - 1) < 0) | |
1774 | return -EFAULT; | |
1775 | tp_name[sizeof(tp_name) - 1] = 0; | |
1776 | ||
a38d1107 | 1777 | btp = bpf_get_raw_tracepoint(tp_name); |
c4f6699d AS |
1778 | if (!btp) |
1779 | return -ENOENT; | |
1780 | ||
1781 | raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER); | |
a38d1107 MM |
1782 | if (!raw_tp) { |
1783 | err = -ENOMEM; | |
1784 | goto out_put_btp; | |
1785 | } | |
c4f6699d AS |
1786 | raw_tp->btp = btp; |
1787 | ||
9df1c28b | 1788 | prog = bpf_prog_get(attr->raw_tracepoint.prog_fd); |
c4f6699d AS |
1789 | if (IS_ERR(prog)) { |
1790 | err = PTR_ERR(prog); | |
1791 | goto out_free_tp; | |
1792 | } | |
9df1c28b MM |
1793 | if (prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT && |
1794 | prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE) { | |
1795 | err = -EINVAL; | |
1796 | goto out_put_prog; | |
1797 | } | |
c4f6699d AS |
1798 | |
1799 | err = bpf_probe_register(raw_tp->btp, prog); | |
1800 | if (err) | |
1801 | goto out_put_prog; | |
1802 | ||
1803 | raw_tp->prog = prog; | |
1804 | tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp, | |
1805 | O_CLOEXEC); | |
1806 | if (tp_fd < 0) { | |
1807 | bpf_probe_unregister(raw_tp->btp, prog); | |
1808 | err = tp_fd; | |
1809 | goto out_put_prog; | |
1810 | } | |
1811 | return tp_fd; | |
1812 | ||
1813 | out_put_prog: | |
1814 | bpf_prog_put(prog); | |
1815 | out_free_tp: | |
1816 | kfree(raw_tp); | |
a38d1107 MM |
1817 | out_put_btp: |
1818 | bpf_put_raw_tracepoint(btp); | |
c4f6699d AS |
1819 | return err; |
1820 | } | |
1821 | ||
33491588 AR |
1822 | static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog, |
1823 | enum bpf_attach_type attach_type) | |
1824 | { | |
1825 | switch (prog->type) { | |
1826 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
1827 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: | |
1828 | return attach_type == prog->expected_attach_type ? 0 : -EINVAL; | |
1829 | default: | |
1830 | return 0; | |
1831 | } | |
1832 | } | |
1833 | ||
464bc0fd | 1834 | #define BPF_PROG_ATTACH_LAST_FIELD attach_flags |
174a79ff | 1835 | |
324bda9e AS |
1836 | #define BPF_F_ATTACH_MASK \ |
1837 | (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI) | |
1838 | ||
f4324551 DM |
1839 | static int bpf_prog_attach(const union bpf_attr *attr) |
1840 | { | |
7f677633 | 1841 | enum bpf_prog_type ptype; |
f4324551 | 1842 | struct bpf_prog *prog; |
7f677633 | 1843 | int ret; |
f4324551 DM |
1844 | |
1845 | if (!capable(CAP_NET_ADMIN)) | |
1846 | return -EPERM; | |
1847 | ||
1848 | if (CHECK_ATTR(BPF_PROG_ATTACH)) | |
1849 | return -EINVAL; | |
1850 | ||
324bda9e | 1851 | if (attr->attach_flags & ~BPF_F_ATTACH_MASK) |
7f677633 AS |
1852 | return -EINVAL; |
1853 | ||
f4324551 DM |
1854 | switch (attr->attach_type) { |
1855 | case BPF_CGROUP_INET_INGRESS: | |
1856 | case BPF_CGROUP_INET_EGRESS: | |
b2cd1257 | 1857 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
f4324551 | 1858 | break; |
61023658 | 1859 | case BPF_CGROUP_INET_SOCK_CREATE: |
aac3fc32 AI |
1860 | case BPF_CGROUP_INET4_POST_BIND: |
1861 | case BPF_CGROUP_INET6_POST_BIND: | |
61023658 DA |
1862 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
1863 | break; | |
4fbac77d AI |
1864 | case BPF_CGROUP_INET4_BIND: |
1865 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
1866 | case BPF_CGROUP_INET4_CONNECT: |
1867 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
1868 | case BPF_CGROUP_UDP4_SENDMSG: |
1869 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
1870 | ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; |
1871 | break; | |
40304b2a LB |
1872 | case BPF_CGROUP_SOCK_OPS: |
1873 | ptype = BPF_PROG_TYPE_SOCK_OPS; | |
1874 | break; | |
ebc614f6 RG |
1875 | case BPF_CGROUP_DEVICE: |
1876 | ptype = BPF_PROG_TYPE_CGROUP_DEVICE; | |
1877 | break; | |
4f738adb | 1878 | case BPF_SK_MSG_VERDICT: |
fdb5c453 SY |
1879 | ptype = BPF_PROG_TYPE_SK_MSG; |
1880 | break; | |
464bc0fd JF |
1881 | case BPF_SK_SKB_STREAM_PARSER: |
1882 | case BPF_SK_SKB_STREAM_VERDICT: | |
fdb5c453 SY |
1883 | ptype = BPF_PROG_TYPE_SK_SKB; |
1884 | break; | |
f4364dcf | 1885 | case BPF_LIRC_MODE2: |
fdb5c453 SY |
1886 | ptype = BPF_PROG_TYPE_LIRC_MODE2; |
1887 | break; | |
d58e468b PP |
1888 | case BPF_FLOW_DISSECTOR: |
1889 | ptype = BPF_PROG_TYPE_FLOW_DISSECTOR; | |
1890 | break; | |
7b146ceb AI |
1891 | case BPF_CGROUP_SYSCTL: |
1892 | ptype = BPF_PROG_TYPE_CGROUP_SYSCTL; | |
1893 | break; | |
f4324551 DM |
1894 | default: |
1895 | return -EINVAL; | |
1896 | } | |
1897 | ||
b2cd1257 DA |
1898 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); |
1899 | if (IS_ERR(prog)) | |
1900 | return PTR_ERR(prog); | |
1901 | ||
5e43f899 AI |
1902 | if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) { |
1903 | bpf_prog_put(prog); | |
1904 | return -EINVAL; | |
1905 | } | |
1906 | ||
fdb5c453 SY |
1907 | switch (ptype) { |
1908 | case BPF_PROG_TYPE_SK_SKB: | |
1909 | case BPF_PROG_TYPE_SK_MSG: | |
604326b4 | 1910 | ret = sock_map_get_from_fd(attr, prog); |
fdb5c453 SY |
1911 | break; |
1912 | case BPF_PROG_TYPE_LIRC_MODE2: | |
1913 | ret = lirc_prog_attach(attr, prog); | |
1914 | break; | |
d58e468b PP |
1915 | case BPF_PROG_TYPE_FLOW_DISSECTOR: |
1916 | ret = skb_flow_dissector_bpf_prog_attach(attr, prog); | |
1917 | break; | |
fdb5c453 SY |
1918 | default: |
1919 | ret = cgroup_bpf_prog_attach(attr, ptype, prog); | |
b2cd1257 DA |
1920 | } |
1921 | ||
7f677633 AS |
1922 | if (ret) |
1923 | bpf_prog_put(prog); | |
7f677633 | 1924 | return ret; |
f4324551 DM |
1925 | } |
1926 | ||
1927 | #define BPF_PROG_DETACH_LAST_FIELD attach_type | |
1928 | ||
1929 | static int bpf_prog_detach(const union bpf_attr *attr) | |
1930 | { | |
324bda9e | 1931 | enum bpf_prog_type ptype; |
f4324551 DM |
1932 | |
1933 | if (!capable(CAP_NET_ADMIN)) | |
1934 | return -EPERM; | |
1935 | ||
1936 | if (CHECK_ATTR(BPF_PROG_DETACH)) | |
1937 | return -EINVAL; | |
1938 | ||
1939 | switch (attr->attach_type) { | |
1940 | case BPF_CGROUP_INET_INGRESS: | |
1941 | case BPF_CGROUP_INET_EGRESS: | |
324bda9e AS |
1942 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
1943 | break; | |
61023658 | 1944 | case BPF_CGROUP_INET_SOCK_CREATE: |
aac3fc32 AI |
1945 | case BPF_CGROUP_INET4_POST_BIND: |
1946 | case BPF_CGROUP_INET6_POST_BIND: | |
324bda9e AS |
1947 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
1948 | break; | |
4fbac77d AI |
1949 | case BPF_CGROUP_INET4_BIND: |
1950 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
1951 | case BPF_CGROUP_INET4_CONNECT: |
1952 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
1953 | case BPF_CGROUP_UDP4_SENDMSG: |
1954 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
1955 | ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; |
1956 | break; | |
40304b2a | 1957 | case BPF_CGROUP_SOCK_OPS: |
324bda9e | 1958 | ptype = BPF_PROG_TYPE_SOCK_OPS; |
f4324551 | 1959 | break; |
ebc614f6 RG |
1960 | case BPF_CGROUP_DEVICE: |
1961 | ptype = BPF_PROG_TYPE_CGROUP_DEVICE; | |
1962 | break; | |
4f738adb | 1963 | case BPF_SK_MSG_VERDICT: |
604326b4 | 1964 | return sock_map_get_from_fd(attr, NULL); |
5a67da2a JF |
1965 | case BPF_SK_SKB_STREAM_PARSER: |
1966 | case BPF_SK_SKB_STREAM_VERDICT: | |
604326b4 | 1967 | return sock_map_get_from_fd(attr, NULL); |
f4364dcf SY |
1968 | case BPF_LIRC_MODE2: |
1969 | return lirc_prog_detach(attr); | |
d58e468b PP |
1970 | case BPF_FLOW_DISSECTOR: |
1971 | return skb_flow_dissector_bpf_prog_detach(attr); | |
7b146ceb AI |
1972 | case BPF_CGROUP_SYSCTL: |
1973 | ptype = BPF_PROG_TYPE_CGROUP_SYSCTL; | |
1974 | break; | |
f4324551 DM |
1975 | default: |
1976 | return -EINVAL; | |
1977 | } | |
1978 | ||
fdb5c453 | 1979 | return cgroup_bpf_prog_detach(attr, ptype); |
f4324551 | 1980 | } |
40304b2a | 1981 | |
468e2f64 AS |
1982 | #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt |
1983 | ||
1984 | static int bpf_prog_query(const union bpf_attr *attr, | |
1985 | union bpf_attr __user *uattr) | |
1986 | { | |
468e2f64 AS |
1987 | if (!capable(CAP_NET_ADMIN)) |
1988 | return -EPERM; | |
1989 | if (CHECK_ATTR(BPF_PROG_QUERY)) | |
1990 | return -EINVAL; | |
1991 | if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE) | |
1992 | return -EINVAL; | |
1993 | ||
1994 | switch (attr->query.attach_type) { | |
1995 | case BPF_CGROUP_INET_INGRESS: | |
1996 | case BPF_CGROUP_INET_EGRESS: | |
1997 | case BPF_CGROUP_INET_SOCK_CREATE: | |
4fbac77d AI |
1998 | case BPF_CGROUP_INET4_BIND: |
1999 | case BPF_CGROUP_INET6_BIND: | |
aac3fc32 AI |
2000 | case BPF_CGROUP_INET4_POST_BIND: |
2001 | case BPF_CGROUP_INET6_POST_BIND: | |
d74bad4e AI |
2002 | case BPF_CGROUP_INET4_CONNECT: |
2003 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
2004 | case BPF_CGROUP_UDP4_SENDMSG: |
2005 | case BPF_CGROUP_UDP6_SENDMSG: | |
468e2f64 | 2006 | case BPF_CGROUP_SOCK_OPS: |
ebc614f6 | 2007 | case BPF_CGROUP_DEVICE: |
7b146ceb | 2008 | case BPF_CGROUP_SYSCTL: |
468e2f64 | 2009 | break; |
f4364dcf SY |
2010 | case BPF_LIRC_MODE2: |
2011 | return lirc_prog_query(attr, uattr); | |
118c8e9a SF |
2012 | case BPF_FLOW_DISSECTOR: |
2013 | return skb_flow_dissector_prog_query(attr, uattr); | |
468e2f64 AS |
2014 | default: |
2015 | return -EINVAL; | |
2016 | } | |
fdb5c453 SY |
2017 | |
2018 | return cgroup_bpf_prog_query(attr, uattr); | |
468e2f64 | 2019 | } |
f4324551 | 2020 | |
b0b9395d | 2021 | #define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out |
1cf1cae9 AS |
2022 | |
2023 | static int bpf_prog_test_run(const union bpf_attr *attr, | |
2024 | union bpf_attr __user *uattr) | |
2025 | { | |
2026 | struct bpf_prog *prog; | |
2027 | int ret = -ENOTSUPP; | |
2028 | ||
61f3c964 AS |
2029 | if (!capable(CAP_SYS_ADMIN)) |
2030 | return -EPERM; | |
1cf1cae9 AS |
2031 | if (CHECK_ATTR(BPF_PROG_TEST_RUN)) |
2032 | return -EINVAL; | |
2033 | ||
b0b9395d SF |
2034 | if ((attr->test.ctx_size_in && !attr->test.ctx_in) || |
2035 | (!attr->test.ctx_size_in && attr->test.ctx_in)) | |
2036 | return -EINVAL; | |
2037 | ||
2038 | if ((attr->test.ctx_size_out && !attr->test.ctx_out) || | |
2039 | (!attr->test.ctx_size_out && attr->test.ctx_out)) | |
2040 | return -EINVAL; | |
2041 | ||
1cf1cae9 AS |
2042 | prog = bpf_prog_get(attr->test.prog_fd); |
2043 | if (IS_ERR(prog)) | |
2044 | return PTR_ERR(prog); | |
2045 | ||
2046 | if (prog->aux->ops->test_run) | |
2047 | ret = prog->aux->ops->test_run(prog, attr, uattr); | |
2048 | ||
2049 | bpf_prog_put(prog); | |
2050 | return ret; | |
2051 | } | |
2052 | ||
34ad5580 MKL |
2053 | #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id |
2054 | ||
2055 | static int bpf_obj_get_next_id(const union bpf_attr *attr, | |
2056 | union bpf_attr __user *uattr, | |
2057 | struct idr *idr, | |
2058 | spinlock_t *lock) | |
2059 | { | |
2060 | u32 next_id = attr->start_id; | |
2061 | int err = 0; | |
2062 | ||
2063 | if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX) | |
2064 | return -EINVAL; | |
2065 | ||
2066 | if (!capable(CAP_SYS_ADMIN)) | |
2067 | return -EPERM; | |
2068 | ||
2069 | next_id++; | |
2070 | spin_lock_bh(lock); | |
2071 | if (!idr_get_next(idr, &next_id)) | |
2072 | err = -ENOENT; | |
2073 | spin_unlock_bh(lock); | |
2074 | ||
2075 | if (!err) | |
2076 | err = put_user(next_id, &uattr->next_id); | |
2077 | ||
2078 | return err; | |
2079 | } | |
2080 | ||
b16d9aa4 MKL |
2081 | #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id |
2082 | ||
2083 | static int bpf_prog_get_fd_by_id(const union bpf_attr *attr) | |
2084 | { | |
2085 | struct bpf_prog *prog; | |
2086 | u32 id = attr->prog_id; | |
2087 | int fd; | |
2088 | ||
2089 | if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID)) | |
2090 | return -EINVAL; | |
2091 | ||
2092 | if (!capable(CAP_SYS_ADMIN)) | |
2093 | return -EPERM; | |
2094 | ||
2095 | spin_lock_bh(&prog_idr_lock); | |
2096 | prog = idr_find(&prog_idr, id); | |
2097 | if (prog) | |
2098 | prog = bpf_prog_inc_not_zero(prog); | |
2099 | else | |
2100 | prog = ERR_PTR(-ENOENT); | |
2101 | spin_unlock_bh(&prog_idr_lock); | |
2102 | ||
2103 | if (IS_ERR(prog)) | |
2104 | return PTR_ERR(prog); | |
2105 | ||
2106 | fd = bpf_prog_new_fd(prog); | |
2107 | if (fd < 0) | |
2108 | bpf_prog_put(prog); | |
2109 | ||
2110 | return fd; | |
2111 | } | |
2112 | ||
6e71b04a | 2113 | #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags |
bd5f5f4e MKL |
2114 | |
2115 | static int bpf_map_get_fd_by_id(const union bpf_attr *attr) | |
2116 | { | |
2117 | struct bpf_map *map; | |
2118 | u32 id = attr->map_id; | |
6e71b04a | 2119 | int f_flags; |
bd5f5f4e MKL |
2120 | int fd; |
2121 | ||
6e71b04a CF |
2122 | if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) || |
2123 | attr->open_flags & ~BPF_OBJ_FLAG_MASK) | |
bd5f5f4e MKL |
2124 | return -EINVAL; |
2125 | ||
2126 | if (!capable(CAP_SYS_ADMIN)) | |
2127 | return -EPERM; | |
2128 | ||
6e71b04a CF |
2129 | f_flags = bpf_get_file_flag(attr->open_flags); |
2130 | if (f_flags < 0) | |
2131 | return f_flags; | |
2132 | ||
bd5f5f4e MKL |
2133 | spin_lock_bh(&map_idr_lock); |
2134 | map = idr_find(&map_idr, id); | |
2135 | if (map) | |
2136 | map = bpf_map_inc_not_zero(map, true); | |
2137 | else | |
2138 | map = ERR_PTR(-ENOENT); | |
2139 | spin_unlock_bh(&map_idr_lock); | |
2140 | ||
2141 | if (IS_ERR(map)) | |
2142 | return PTR_ERR(map); | |
2143 | ||
6e71b04a | 2144 | fd = bpf_map_new_fd(map, f_flags); |
bd5f5f4e | 2145 | if (fd < 0) |
781e6282 | 2146 | bpf_map_put_with_uref(map); |
bd5f5f4e MKL |
2147 | |
2148 | return fd; | |
2149 | } | |
2150 | ||
7105e828 | 2151 | static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog, |
d8eca5bb DB |
2152 | unsigned long addr, u32 *off, |
2153 | u32 *type) | |
7105e828 | 2154 | { |
d8eca5bb | 2155 | const struct bpf_map *map; |
7105e828 DB |
2156 | int i; |
2157 | ||
d8eca5bb DB |
2158 | for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) { |
2159 | map = prog->aux->used_maps[i]; | |
2160 | if (map == (void *)addr) { | |
2161 | *type = BPF_PSEUDO_MAP_FD; | |
2162 | return map; | |
2163 | } | |
2164 | if (!map->ops->map_direct_value_meta) | |
2165 | continue; | |
2166 | if (!map->ops->map_direct_value_meta(map, addr, off)) { | |
2167 | *type = BPF_PSEUDO_MAP_VALUE; | |
2168 | return map; | |
2169 | } | |
2170 | } | |
2171 | ||
7105e828 DB |
2172 | return NULL; |
2173 | } | |
2174 | ||
2175 | static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog) | |
2176 | { | |
2177 | const struct bpf_map *map; | |
2178 | struct bpf_insn *insns; | |
d8eca5bb | 2179 | u32 off, type; |
7105e828 DB |
2180 | u64 imm; |
2181 | int i; | |
2182 | ||
2183 | insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog), | |
2184 | GFP_USER); | |
2185 | if (!insns) | |
2186 | return insns; | |
2187 | ||
2188 | for (i = 0; i < prog->len; i++) { | |
2189 | if (insns[i].code == (BPF_JMP | BPF_TAIL_CALL)) { | |
2190 | insns[i].code = BPF_JMP | BPF_CALL; | |
2191 | insns[i].imm = BPF_FUNC_tail_call; | |
2192 | /* fall-through */ | |
2193 | } | |
2194 | if (insns[i].code == (BPF_JMP | BPF_CALL) || | |
2195 | insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) { | |
2196 | if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) | |
2197 | insns[i].code = BPF_JMP | BPF_CALL; | |
2198 | if (!bpf_dump_raw_ok()) | |
2199 | insns[i].imm = 0; | |
2200 | continue; | |
2201 | } | |
2202 | ||
2203 | if (insns[i].code != (BPF_LD | BPF_IMM | BPF_DW)) | |
2204 | continue; | |
2205 | ||
2206 | imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm; | |
d8eca5bb | 2207 | map = bpf_map_from_imm(prog, imm, &off, &type); |
7105e828 | 2208 | if (map) { |
d8eca5bb | 2209 | insns[i].src_reg = type; |
7105e828 | 2210 | insns[i].imm = map->id; |
d8eca5bb | 2211 | insns[i + 1].imm = off; |
7105e828 DB |
2212 | continue; |
2213 | } | |
7105e828 DB |
2214 | } |
2215 | ||
2216 | return insns; | |
2217 | } | |
2218 | ||
c454a46b MKL |
2219 | static int set_info_rec_size(struct bpf_prog_info *info) |
2220 | { | |
2221 | /* | |
2222 | * Ensure info.*_rec_size is the same as kernel expected size | |
2223 | * | |
2224 | * or | |
2225 | * | |
2226 | * Only allow zero *_rec_size if both _rec_size and _cnt are | |
2227 | * zero. In this case, the kernel will set the expected | |
2228 | * _rec_size back to the info. | |
2229 | */ | |
2230 | ||
11d8b82d | 2231 | if ((info->nr_func_info || info->func_info_rec_size) && |
c454a46b MKL |
2232 | info->func_info_rec_size != sizeof(struct bpf_func_info)) |
2233 | return -EINVAL; | |
2234 | ||
11d8b82d | 2235 | if ((info->nr_line_info || info->line_info_rec_size) && |
c454a46b MKL |
2236 | info->line_info_rec_size != sizeof(struct bpf_line_info)) |
2237 | return -EINVAL; | |
2238 | ||
11d8b82d | 2239 | if ((info->nr_jited_line_info || info->jited_line_info_rec_size) && |
c454a46b MKL |
2240 | info->jited_line_info_rec_size != sizeof(__u64)) |
2241 | return -EINVAL; | |
2242 | ||
2243 | info->func_info_rec_size = sizeof(struct bpf_func_info); | |
2244 | info->line_info_rec_size = sizeof(struct bpf_line_info); | |
2245 | info->jited_line_info_rec_size = sizeof(__u64); | |
2246 | ||
2247 | return 0; | |
2248 | } | |
2249 | ||
1e270976 MKL |
2250 | static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, |
2251 | const union bpf_attr *attr, | |
2252 | union bpf_attr __user *uattr) | |
2253 | { | |
2254 | struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
2255 | struct bpf_prog_info info = {}; | |
2256 | u32 info_len = attr->info.info_len; | |
5f8f8b93 | 2257 | struct bpf_prog_stats stats; |
1e270976 MKL |
2258 | char __user *uinsns; |
2259 | u32 ulen; | |
2260 | int err; | |
2261 | ||
dcab51f1 | 2262 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); |
1e270976 MKL |
2263 | if (err) |
2264 | return err; | |
2265 | info_len = min_t(u32, sizeof(info), info_len); | |
2266 | ||
2267 | if (copy_from_user(&info, uinfo, info_len)) | |
89b09689 | 2268 | return -EFAULT; |
1e270976 MKL |
2269 | |
2270 | info.type = prog->type; | |
2271 | info.id = prog->aux->id; | |
cb4d2b3f MKL |
2272 | info.load_time = prog->aux->load_time; |
2273 | info.created_by_uid = from_kuid_munged(current_user_ns(), | |
2274 | prog->aux->user->uid); | |
b85fab0e | 2275 | info.gpl_compatible = prog->gpl_compatible; |
1e270976 MKL |
2276 | |
2277 | memcpy(info.tag, prog->tag, sizeof(prog->tag)); | |
cb4d2b3f MKL |
2278 | memcpy(info.name, prog->aux->name, sizeof(prog->aux->name)); |
2279 | ||
2280 | ulen = info.nr_map_ids; | |
2281 | info.nr_map_ids = prog->aux->used_map_cnt; | |
2282 | ulen = min_t(u32, info.nr_map_ids, ulen); | |
2283 | if (ulen) { | |
721e08da | 2284 | u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids); |
cb4d2b3f MKL |
2285 | u32 i; |
2286 | ||
2287 | for (i = 0; i < ulen; i++) | |
2288 | if (put_user(prog->aux->used_maps[i]->id, | |
2289 | &user_map_ids[i])) | |
2290 | return -EFAULT; | |
2291 | } | |
1e270976 | 2292 | |
c454a46b MKL |
2293 | err = set_info_rec_size(&info); |
2294 | if (err) | |
2295 | return err; | |
7337224f | 2296 | |
5f8f8b93 AS |
2297 | bpf_prog_get_stats(prog, &stats); |
2298 | info.run_time_ns = stats.nsecs; | |
2299 | info.run_cnt = stats.cnt; | |
2300 | ||
1e270976 MKL |
2301 | if (!capable(CAP_SYS_ADMIN)) { |
2302 | info.jited_prog_len = 0; | |
2303 | info.xlated_prog_len = 0; | |
dbecd738 | 2304 | info.nr_jited_ksyms = 0; |
28c2fae7 | 2305 | info.nr_jited_func_lens = 0; |
11d8b82d YS |
2306 | info.nr_func_info = 0; |
2307 | info.nr_line_info = 0; | |
2308 | info.nr_jited_line_info = 0; | |
1e270976 MKL |
2309 | goto done; |
2310 | } | |
2311 | ||
1e270976 | 2312 | ulen = info.xlated_prog_len; |
9975a54b | 2313 | info.xlated_prog_len = bpf_prog_insn_size(prog); |
1e270976 | 2314 | if (info.xlated_prog_len && ulen) { |
7105e828 DB |
2315 | struct bpf_insn *insns_sanitized; |
2316 | bool fault; | |
2317 | ||
2318 | if (prog->blinded && !bpf_dump_raw_ok()) { | |
2319 | info.xlated_prog_insns = 0; | |
2320 | goto done; | |
2321 | } | |
2322 | insns_sanitized = bpf_insn_prepare_dump(prog); | |
2323 | if (!insns_sanitized) | |
2324 | return -ENOMEM; | |
1e270976 MKL |
2325 | uinsns = u64_to_user_ptr(info.xlated_prog_insns); |
2326 | ulen = min_t(u32, info.xlated_prog_len, ulen); | |
7105e828 DB |
2327 | fault = copy_to_user(uinsns, insns_sanitized, ulen); |
2328 | kfree(insns_sanitized); | |
2329 | if (fault) | |
1e270976 MKL |
2330 | return -EFAULT; |
2331 | } | |
2332 | ||
675fc275 JK |
2333 | if (bpf_prog_is_dev_bound(prog->aux)) { |
2334 | err = bpf_prog_offload_info_fill(&info, prog); | |
2335 | if (err) | |
2336 | return err; | |
fcfb126d JW |
2337 | goto done; |
2338 | } | |
2339 | ||
2340 | /* NOTE: the following code is supposed to be skipped for offload. | |
2341 | * bpf_prog_offload_info_fill() is the place to fill similar fields | |
2342 | * for offload. | |
2343 | */ | |
2344 | ulen = info.jited_prog_len; | |
4d56a76e SD |
2345 | if (prog->aux->func_cnt) { |
2346 | u32 i; | |
2347 | ||
2348 | info.jited_prog_len = 0; | |
2349 | for (i = 0; i < prog->aux->func_cnt; i++) | |
2350 | info.jited_prog_len += prog->aux->func[i]->jited_len; | |
2351 | } else { | |
2352 | info.jited_prog_len = prog->jited_len; | |
2353 | } | |
2354 | ||
fcfb126d JW |
2355 | if (info.jited_prog_len && ulen) { |
2356 | if (bpf_dump_raw_ok()) { | |
2357 | uinsns = u64_to_user_ptr(info.jited_prog_insns); | |
2358 | ulen = min_t(u32, info.jited_prog_len, ulen); | |
4d56a76e SD |
2359 | |
2360 | /* for multi-function programs, copy the JITed | |
2361 | * instructions for all the functions | |
2362 | */ | |
2363 | if (prog->aux->func_cnt) { | |
2364 | u32 len, free, i; | |
2365 | u8 *img; | |
2366 | ||
2367 | free = ulen; | |
2368 | for (i = 0; i < prog->aux->func_cnt; i++) { | |
2369 | len = prog->aux->func[i]->jited_len; | |
2370 | len = min_t(u32, len, free); | |
2371 | img = (u8 *) prog->aux->func[i]->bpf_func; | |
2372 | if (copy_to_user(uinsns, img, len)) | |
2373 | return -EFAULT; | |
2374 | uinsns += len; | |
2375 | free -= len; | |
2376 | if (!free) | |
2377 | break; | |
2378 | } | |
2379 | } else { | |
2380 | if (copy_to_user(uinsns, prog->bpf_func, ulen)) | |
2381 | return -EFAULT; | |
2382 | } | |
fcfb126d JW |
2383 | } else { |
2384 | info.jited_prog_insns = 0; | |
2385 | } | |
675fc275 JK |
2386 | } |
2387 | ||
dbecd738 | 2388 | ulen = info.nr_jited_ksyms; |
ff1889fc | 2389 | info.nr_jited_ksyms = prog->aux->func_cnt ? : 1; |
7a5725dd | 2390 | if (ulen) { |
dbecd738 | 2391 | if (bpf_dump_raw_ok()) { |
ff1889fc | 2392 | unsigned long ksym_addr; |
dbecd738 | 2393 | u64 __user *user_ksyms; |
dbecd738 SD |
2394 | u32 i; |
2395 | ||
2396 | /* copy the address of the kernel symbol | |
2397 | * corresponding to each function | |
2398 | */ | |
2399 | ulen = min_t(u32, info.nr_jited_ksyms, ulen); | |
2400 | user_ksyms = u64_to_user_ptr(info.jited_ksyms); | |
ff1889fc SL |
2401 | if (prog->aux->func_cnt) { |
2402 | for (i = 0; i < ulen; i++) { | |
2403 | ksym_addr = (unsigned long) | |
2404 | prog->aux->func[i]->bpf_func; | |
2405 | if (put_user((u64) ksym_addr, | |
2406 | &user_ksyms[i])) | |
2407 | return -EFAULT; | |
2408 | } | |
2409 | } else { | |
2410 | ksym_addr = (unsigned long) prog->bpf_func; | |
2411 | if (put_user((u64) ksym_addr, &user_ksyms[0])) | |
dbecd738 SD |
2412 | return -EFAULT; |
2413 | } | |
2414 | } else { | |
2415 | info.jited_ksyms = 0; | |
2416 | } | |
2417 | } | |
2418 | ||
815581c1 | 2419 | ulen = info.nr_jited_func_lens; |
ff1889fc | 2420 | info.nr_jited_func_lens = prog->aux->func_cnt ? : 1; |
7a5725dd | 2421 | if (ulen) { |
815581c1 SD |
2422 | if (bpf_dump_raw_ok()) { |
2423 | u32 __user *user_lens; | |
2424 | u32 func_len, i; | |
2425 | ||
2426 | /* copy the JITed image lengths for each function */ | |
2427 | ulen = min_t(u32, info.nr_jited_func_lens, ulen); | |
2428 | user_lens = u64_to_user_ptr(info.jited_func_lens); | |
ff1889fc SL |
2429 | if (prog->aux->func_cnt) { |
2430 | for (i = 0; i < ulen; i++) { | |
2431 | func_len = | |
2432 | prog->aux->func[i]->jited_len; | |
2433 | if (put_user(func_len, &user_lens[i])) | |
2434 | return -EFAULT; | |
2435 | } | |
2436 | } else { | |
2437 | func_len = prog->jited_len; | |
2438 | if (put_user(func_len, &user_lens[0])) | |
815581c1 SD |
2439 | return -EFAULT; |
2440 | } | |
2441 | } else { | |
2442 | info.jited_func_lens = 0; | |
2443 | } | |
2444 | } | |
2445 | ||
7337224f | 2446 | if (prog->aux->btf) |
838e9690 YS |
2447 | info.btf_id = btf_id(prog->aux->btf); |
2448 | ||
11d8b82d YS |
2449 | ulen = info.nr_func_info; |
2450 | info.nr_func_info = prog->aux->func_info_cnt; | |
2451 | if (info.nr_func_info && ulen) { | |
9e794163 | 2452 | char __user *user_finfo; |
7337224f | 2453 | |
9e794163 MKL |
2454 | user_finfo = u64_to_user_ptr(info.func_info); |
2455 | ulen = min_t(u32, info.nr_func_info, ulen); | |
2456 | if (copy_to_user(user_finfo, prog->aux->func_info, | |
2457 | info.func_info_rec_size * ulen)) | |
2458 | return -EFAULT; | |
838e9690 YS |
2459 | } |
2460 | ||
11d8b82d YS |
2461 | ulen = info.nr_line_info; |
2462 | info.nr_line_info = prog->aux->nr_linfo; | |
2463 | if (info.nr_line_info && ulen) { | |
9e794163 | 2464 | __u8 __user *user_linfo; |
c454a46b | 2465 | |
9e794163 MKL |
2466 | user_linfo = u64_to_user_ptr(info.line_info); |
2467 | ulen = min_t(u32, info.nr_line_info, ulen); | |
2468 | if (copy_to_user(user_linfo, prog->aux->linfo, | |
2469 | info.line_info_rec_size * ulen)) | |
2470 | return -EFAULT; | |
c454a46b MKL |
2471 | } |
2472 | ||
11d8b82d | 2473 | ulen = info.nr_jited_line_info; |
c454a46b | 2474 | if (prog->aux->jited_linfo) |
11d8b82d | 2475 | info.nr_jited_line_info = prog->aux->nr_linfo; |
c454a46b | 2476 | else |
11d8b82d YS |
2477 | info.nr_jited_line_info = 0; |
2478 | if (info.nr_jited_line_info && ulen) { | |
c454a46b MKL |
2479 | if (bpf_dump_raw_ok()) { |
2480 | __u64 __user *user_linfo; | |
2481 | u32 i; | |
2482 | ||
2483 | user_linfo = u64_to_user_ptr(info.jited_line_info); | |
11d8b82d | 2484 | ulen = min_t(u32, info.nr_jited_line_info, ulen); |
c454a46b MKL |
2485 | for (i = 0; i < ulen; i++) { |
2486 | if (put_user((__u64)(long)prog->aux->jited_linfo[i], | |
2487 | &user_linfo[i])) | |
2488 | return -EFAULT; | |
2489 | } | |
2490 | } else { | |
2491 | info.jited_line_info = 0; | |
2492 | } | |
2493 | } | |
2494 | ||
c872bdb3 SL |
2495 | ulen = info.nr_prog_tags; |
2496 | info.nr_prog_tags = prog->aux->func_cnt ? : 1; | |
2497 | if (ulen) { | |
2498 | __u8 __user (*user_prog_tags)[BPF_TAG_SIZE]; | |
2499 | u32 i; | |
2500 | ||
2501 | user_prog_tags = u64_to_user_ptr(info.prog_tags); | |
2502 | ulen = min_t(u32, info.nr_prog_tags, ulen); | |
2503 | if (prog->aux->func_cnt) { | |
2504 | for (i = 0; i < ulen; i++) { | |
2505 | if (copy_to_user(user_prog_tags[i], | |
2506 | prog->aux->func[i]->tag, | |
2507 | BPF_TAG_SIZE)) | |
2508 | return -EFAULT; | |
2509 | } | |
2510 | } else { | |
2511 | if (copy_to_user(user_prog_tags[0], | |
2512 | prog->tag, BPF_TAG_SIZE)) | |
2513 | return -EFAULT; | |
2514 | } | |
2515 | } | |
2516 | ||
1e270976 MKL |
2517 | done: |
2518 | if (copy_to_user(uinfo, &info, info_len) || | |
2519 | put_user(info_len, &uattr->info.info_len)) | |
2520 | return -EFAULT; | |
2521 | ||
2522 | return 0; | |
2523 | } | |
2524 | ||
2525 | static int bpf_map_get_info_by_fd(struct bpf_map *map, | |
2526 | const union bpf_attr *attr, | |
2527 | union bpf_attr __user *uattr) | |
2528 | { | |
2529 | struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
2530 | struct bpf_map_info info = {}; | |
2531 | u32 info_len = attr->info.info_len; | |
2532 | int err; | |
2533 | ||
dcab51f1 | 2534 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); |
1e270976 MKL |
2535 | if (err) |
2536 | return err; | |
2537 | info_len = min_t(u32, sizeof(info), info_len); | |
2538 | ||
2539 | info.type = map->map_type; | |
2540 | info.id = map->id; | |
2541 | info.key_size = map->key_size; | |
2542 | info.value_size = map->value_size; | |
2543 | info.max_entries = map->max_entries; | |
2544 | info.map_flags = map->map_flags; | |
ad5b177b | 2545 | memcpy(info.name, map->name, sizeof(map->name)); |
1e270976 | 2546 | |
78958fca MKL |
2547 | if (map->btf) { |
2548 | info.btf_id = btf_id(map->btf); | |
9b2cf328 MKL |
2549 | info.btf_key_type_id = map->btf_key_type_id; |
2550 | info.btf_value_type_id = map->btf_value_type_id; | |
78958fca MKL |
2551 | } |
2552 | ||
52775b33 JK |
2553 | if (bpf_map_is_dev_bound(map)) { |
2554 | err = bpf_map_offload_info_fill(&info, map); | |
2555 | if (err) | |
2556 | return err; | |
2557 | } | |
2558 | ||
1e270976 MKL |
2559 | if (copy_to_user(uinfo, &info, info_len) || |
2560 | put_user(info_len, &uattr->info.info_len)) | |
2561 | return -EFAULT; | |
2562 | ||
2563 | return 0; | |
2564 | } | |
2565 | ||
62dab84c MKL |
2566 | static int bpf_btf_get_info_by_fd(struct btf *btf, |
2567 | const union bpf_attr *attr, | |
2568 | union bpf_attr __user *uattr) | |
2569 | { | |
2570 | struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
2571 | u32 info_len = attr->info.info_len; | |
2572 | int err; | |
2573 | ||
dcab51f1 | 2574 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len); |
62dab84c MKL |
2575 | if (err) |
2576 | return err; | |
2577 | ||
2578 | return btf_get_info_by_fd(btf, attr, uattr); | |
2579 | } | |
2580 | ||
1e270976 MKL |
2581 | #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info |
2582 | ||
2583 | static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, | |
2584 | union bpf_attr __user *uattr) | |
2585 | { | |
2586 | int ufd = attr->info.bpf_fd; | |
2587 | struct fd f; | |
2588 | int err; | |
2589 | ||
2590 | if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD)) | |
2591 | return -EINVAL; | |
2592 | ||
2593 | f = fdget(ufd); | |
2594 | if (!f.file) | |
2595 | return -EBADFD; | |
2596 | ||
2597 | if (f.file->f_op == &bpf_prog_fops) | |
2598 | err = bpf_prog_get_info_by_fd(f.file->private_data, attr, | |
2599 | uattr); | |
2600 | else if (f.file->f_op == &bpf_map_fops) | |
2601 | err = bpf_map_get_info_by_fd(f.file->private_data, attr, | |
2602 | uattr); | |
60197cfb | 2603 | else if (f.file->f_op == &btf_fops) |
62dab84c | 2604 | err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr); |
1e270976 MKL |
2605 | else |
2606 | err = -EINVAL; | |
2607 | ||
2608 | fdput(f); | |
2609 | return err; | |
2610 | } | |
2611 | ||
f56a653c MKL |
2612 | #define BPF_BTF_LOAD_LAST_FIELD btf_log_level |
2613 | ||
2614 | static int bpf_btf_load(const union bpf_attr *attr) | |
2615 | { | |
2616 | if (CHECK_ATTR(BPF_BTF_LOAD)) | |
2617 | return -EINVAL; | |
2618 | ||
2619 | if (!capable(CAP_SYS_ADMIN)) | |
2620 | return -EPERM; | |
2621 | ||
2622 | return btf_new_fd(attr); | |
2623 | } | |
2624 | ||
78958fca MKL |
2625 | #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id |
2626 | ||
2627 | static int bpf_btf_get_fd_by_id(const union bpf_attr *attr) | |
2628 | { | |
2629 | if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID)) | |
2630 | return -EINVAL; | |
2631 | ||
2632 | if (!capable(CAP_SYS_ADMIN)) | |
2633 | return -EPERM; | |
2634 | ||
2635 | return btf_get_fd_by_id(attr->btf_id); | |
2636 | } | |
2637 | ||
41bdc4b4 YS |
2638 | static int bpf_task_fd_query_copy(const union bpf_attr *attr, |
2639 | union bpf_attr __user *uattr, | |
2640 | u32 prog_id, u32 fd_type, | |
2641 | const char *buf, u64 probe_offset, | |
2642 | u64 probe_addr) | |
2643 | { | |
2644 | char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf); | |
2645 | u32 len = buf ? strlen(buf) : 0, input_len; | |
2646 | int err = 0; | |
2647 | ||
2648 | if (put_user(len, &uattr->task_fd_query.buf_len)) | |
2649 | return -EFAULT; | |
2650 | input_len = attr->task_fd_query.buf_len; | |
2651 | if (input_len && ubuf) { | |
2652 | if (!len) { | |
2653 | /* nothing to copy, just make ubuf NULL terminated */ | |
2654 | char zero = '\0'; | |
2655 | ||
2656 | if (put_user(zero, ubuf)) | |
2657 | return -EFAULT; | |
2658 | } else if (input_len >= len + 1) { | |
2659 | /* ubuf can hold the string with NULL terminator */ | |
2660 | if (copy_to_user(ubuf, buf, len + 1)) | |
2661 | return -EFAULT; | |
2662 | } else { | |
2663 | /* ubuf cannot hold the string with NULL terminator, | |
2664 | * do a partial copy with NULL terminator. | |
2665 | */ | |
2666 | char zero = '\0'; | |
2667 | ||
2668 | err = -ENOSPC; | |
2669 | if (copy_to_user(ubuf, buf, input_len - 1)) | |
2670 | return -EFAULT; | |
2671 | if (put_user(zero, ubuf + input_len - 1)) | |
2672 | return -EFAULT; | |
2673 | } | |
2674 | } | |
2675 | ||
2676 | if (put_user(prog_id, &uattr->task_fd_query.prog_id) || | |
2677 | put_user(fd_type, &uattr->task_fd_query.fd_type) || | |
2678 | put_user(probe_offset, &uattr->task_fd_query.probe_offset) || | |
2679 | put_user(probe_addr, &uattr->task_fd_query.probe_addr)) | |
2680 | return -EFAULT; | |
2681 | ||
2682 | return err; | |
2683 | } | |
2684 | ||
2685 | #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr | |
2686 | ||
2687 | static int bpf_task_fd_query(const union bpf_attr *attr, | |
2688 | union bpf_attr __user *uattr) | |
2689 | { | |
2690 | pid_t pid = attr->task_fd_query.pid; | |
2691 | u32 fd = attr->task_fd_query.fd; | |
2692 | const struct perf_event *event; | |
2693 | struct files_struct *files; | |
2694 | struct task_struct *task; | |
2695 | struct file *file; | |
2696 | int err; | |
2697 | ||
2698 | if (CHECK_ATTR(BPF_TASK_FD_QUERY)) | |
2699 | return -EINVAL; | |
2700 | ||
2701 | if (!capable(CAP_SYS_ADMIN)) | |
2702 | return -EPERM; | |
2703 | ||
2704 | if (attr->task_fd_query.flags != 0) | |
2705 | return -EINVAL; | |
2706 | ||
2707 | task = get_pid_task(find_vpid(pid), PIDTYPE_PID); | |
2708 | if (!task) | |
2709 | return -ENOENT; | |
2710 | ||
2711 | files = get_files_struct(task); | |
2712 | put_task_struct(task); | |
2713 | if (!files) | |
2714 | return -ENOENT; | |
2715 | ||
2716 | err = 0; | |
2717 | spin_lock(&files->file_lock); | |
2718 | file = fcheck_files(files, fd); | |
2719 | if (!file) | |
2720 | err = -EBADF; | |
2721 | else | |
2722 | get_file(file); | |
2723 | spin_unlock(&files->file_lock); | |
2724 | put_files_struct(files); | |
2725 | ||
2726 | if (err) | |
2727 | goto out; | |
2728 | ||
2729 | if (file->f_op == &bpf_raw_tp_fops) { | |
2730 | struct bpf_raw_tracepoint *raw_tp = file->private_data; | |
2731 | struct bpf_raw_event_map *btp = raw_tp->btp; | |
2732 | ||
2733 | err = bpf_task_fd_query_copy(attr, uattr, | |
2734 | raw_tp->prog->aux->id, | |
2735 | BPF_FD_TYPE_RAW_TRACEPOINT, | |
2736 | btp->tp->name, 0, 0); | |
2737 | goto put_file; | |
2738 | } | |
2739 | ||
2740 | event = perf_get_event(file); | |
2741 | if (!IS_ERR(event)) { | |
2742 | u64 probe_offset, probe_addr; | |
2743 | u32 prog_id, fd_type; | |
2744 | const char *buf; | |
2745 | ||
2746 | err = bpf_get_perf_event_info(event, &prog_id, &fd_type, | |
2747 | &buf, &probe_offset, | |
2748 | &probe_addr); | |
2749 | if (!err) | |
2750 | err = bpf_task_fd_query_copy(attr, uattr, prog_id, | |
2751 | fd_type, buf, | |
2752 | probe_offset, | |
2753 | probe_addr); | |
2754 | goto put_file; | |
2755 | } | |
2756 | ||
2757 | err = -ENOTSUPP; | |
2758 | put_file: | |
2759 | fput(file); | |
2760 | out: | |
2761 | return err; | |
2762 | } | |
2763 | ||
99c55f7d AS |
2764 | SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) |
2765 | { | |
2766 | union bpf_attr attr = {}; | |
2767 | int err; | |
2768 | ||
0fa4fe85 | 2769 | if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN)) |
99c55f7d AS |
2770 | return -EPERM; |
2771 | ||
dcab51f1 | 2772 | err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size); |
1e270976 MKL |
2773 | if (err) |
2774 | return err; | |
2775 | size = min_t(u32, size, sizeof(attr)); | |
99c55f7d AS |
2776 | |
2777 | /* copy attributes from user space, may be less than sizeof(bpf_attr) */ | |
2778 | if (copy_from_user(&attr, uattr, size) != 0) | |
2779 | return -EFAULT; | |
2780 | ||
afdb09c7 CF |
2781 | err = security_bpf(cmd, &attr, size); |
2782 | if (err < 0) | |
2783 | return err; | |
2784 | ||
99c55f7d AS |
2785 | switch (cmd) { |
2786 | case BPF_MAP_CREATE: | |
2787 | err = map_create(&attr); | |
2788 | break; | |
db20fd2b AS |
2789 | case BPF_MAP_LOOKUP_ELEM: |
2790 | err = map_lookup_elem(&attr); | |
2791 | break; | |
2792 | case BPF_MAP_UPDATE_ELEM: | |
2793 | err = map_update_elem(&attr); | |
2794 | break; | |
2795 | case BPF_MAP_DELETE_ELEM: | |
2796 | err = map_delete_elem(&attr); | |
2797 | break; | |
2798 | case BPF_MAP_GET_NEXT_KEY: | |
2799 | err = map_get_next_key(&attr); | |
2800 | break; | |
87df15de DB |
2801 | case BPF_MAP_FREEZE: |
2802 | err = map_freeze(&attr); | |
2803 | break; | |
09756af4 | 2804 | case BPF_PROG_LOAD: |
838e9690 | 2805 | err = bpf_prog_load(&attr, uattr); |
09756af4 | 2806 | break; |
b2197755 DB |
2807 | case BPF_OBJ_PIN: |
2808 | err = bpf_obj_pin(&attr); | |
2809 | break; | |
2810 | case BPF_OBJ_GET: | |
2811 | err = bpf_obj_get(&attr); | |
2812 | break; | |
f4324551 DM |
2813 | case BPF_PROG_ATTACH: |
2814 | err = bpf_prog_attach(&attr); | |
2815 | break; | |
2816 | case BPF_PROG_DETACH: | |
2817 | err = bpf_prog_detach(&attr); | |
2818 | break; | |
468e2f64 AS |
2819 | case BPF_PROG_QUERY: |
2820 | err = bpf_prog_query(&attr, uattr); | |
2821 | break; | |
1cf1cae9 AS |
2822 | case BPF_PROG_TEST_RUN: |
2823 | err = bpf_prog_test_run(&attr, uattr); | |
2824 | break; | |
34ad5580 MKL |
2825 | case BPF_PROG_GET_NEXT_ID: |
2826 | err = bpf_obj_get_next_id(&attr, uattr, | |
2827 | &prog_idr, &prog_idr_lock); | |
2828 | break; | |
2829 | case BPF_MAP_GET_NEXT_ID: | |
2830 | err = bpf_obj_get_next_id(&attr, uattr, | |
2831 | &map_idr, &map_idr_lock); | |
2832 | break; | |
b16d9aa4 MKL |
2833 | case BPF_PROG_GET_FD_BY_ID: |
2834 | err = bpf_prog_get_fd_by_id(&attr); | |
2835 | break; | |
bd5f5f4e MKL |
2836 | case BPF_MAP_GET_FD_BY_ID: |
2837 | err = bpf_map_get_fd_by_id(&attr); | |
2838 | break; | |
1e270976 MKL |
2839 | case BPF_OBJ_GET_INFO_BY_FD: |
2840 | err = bpf_obj_get_info_by_fd(&attr, uattr); | |
2841 | break; | |
c4f6699d AS |
2842 | case BPF_RAW_TRACEPOINT_OPEN: |
2843 | err = bpf_raw_tracepoint_open(&attr); | |
2844 | break; | |
f56a653c MKL |
2845 | case BPF_BTF_LOAD: |
2846 | err = bpf_btf_load(&attr); | |
2847 | break; | |
78958fca MKL |
2848 | case BPF_BTF_GET_FD_BY_ID: |
2849 | err = bpf_btf_get_fd_by_id(&attr); | |
2850 | break; | |
41bdc4b4 YS |
2851 | case BPF_TASK_FD_QUERY: |
2852 | err = bpf_task_fd_query(&attr, uattr); | |
2853 | break; | |
bd513cd0 MV |
2854 | case BPF_MAP_LOOKUP_AND_DELETE_ELEM: |
2855 | err = map_lookup_and_delete_elem(&attr); | |
2856 | break; | |
99c55f7d AS |
2857 | default: |
2858 | err = -EINVAL; | |
2859 | break; | |
2860 | } | |
2861 | ||
2862 | return err; | |
2863 | } |