Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/fcntl.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
8 | #include <linux/syscalls.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/mm.h> | |
29930025 | 11 | #include <linux/sched/task.h> |
1da177e4 | 12 | #include <linux/fs.h> |
5970e15d | 13 | #include <linux/filelock.h> |
1da177e4 | 14 | #include <linux/file.h> |
9f3acc31 | 15 | #include <linux/fdtable.h> |
16f7e0fe | 16 | #include <linux/capability.h> |
1da177e4 | 17 | #include <linux/dnotify.h> |
1da177e4 LT |
18 | #include <linux/slab.h> |
19 | #include <linux/module.h> | |
35f3d14d | 20 | #include <linux/pipe_fs_i.h> |
1da177e4 LT |
21 | #include <linux/security.h> |
22 | #include <linux/ptrace.h> | |
7ed20e1a | 23 | #include <linux/signal.h> |
ab2af1f5 | 24 | #include <linux/rcupdate.h> |
b488893a | 25 | #include <linux/pid_namespace.h> |
1d151c33 | 26 | #include <linux/user_namespace.h> |
5d752600 | 27 | #include <linux/memfd.h> |
80f0cce6 | 28 | #include <linux/compat.h> |
9eccd12c | 29 | #include <linux/mount.h> |
1da177e4 | 30 | |
cfe39442 | 31 | #include <linux/poll.h> |
1da177e4 | 32 | #include <asm/siginfo.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 | 34 | |
76398425 | 35 | #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME) |
1da177e4 LT |
36 | |
37 | static int setfl(int fd, struct file * filp, unsigned long arg) | |
38 | { | |
496ad9aa | 39 | struct inode * inode = file_inode(filp); |
1da177e4 LT |
40 | int error = 0; |
41 | ||
7d95c8f2 | 42 | /* |
43 | * O_APPEND cannot be cleared if the file is marked as append-only | |
44 | * and the file is open for write. | |
45 | */ | |
46 | if (((arg ^ filp->f_flags) & O_APPEND) && IS_APPEND(inode)) | |
1da177e4 LT |
47 | return -EPERM; |
48 | ||
49 | /* O_NOATIME can only be set by the owner or superuser */ | |
50 | if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME)) | |
01beba79 | 51 | if (!inode_owner_or_capable(file_mnt_idmap(filp), inode)) |
1da177e4 LT |
52 | return -EPERM; |
53 | ||
54 | /* required for strict SunOS emulation */ | |
55 | if (O_NONBLOCK != O_NDELAY) | |
56 | if (arg & O_NDELAY) | |
57 | arg |= O_NONBLOCK; | |
58 | ||
0dbf5f20 | 59 | /* Pipe packetized mode is controlled by O_DIRECT flag */ |
a2ad63da N |
60 | if (!S_ISFIFO(inode->i_mode) && |
61 | (arg & O_DIRECT) && | |
62 | !(filp->f_mode & FMODE_CAN_ODIRECT)) | |
63 | return -EINVAL; | |
1da177e4 | 64 | |
72c2d531 | 65 | if (filp->f_op->check_flags) |
1da177e4 LT |
66 | error = filp->f_op->check_flags(arg); |
67 | if (error) | |
68 | return error; | |
69 | ||
218d11a8 | 70 | /* |
76398425 | 71 | * ->fasync() is responsible for setting the FASYNC bit. |
218d11a8 | 72 | */ |
72c2d531 | 73 | if (((arg ^ filp->f_flags) & FASYNC) && filp->f_op->fasync) { |
76398425 JC |
74 | error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0); |
75 | if (error < 0) | |
76 | goto out; | |
60aa4924 JC |
77 | if (error > 0) |
78 | error = 0; | |
1da177e4 | 79 | } |
db1dd4d3 | 80 | spin_lock(&filp->f_lock); |
1da177e4 | 81 | filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK); |
164f4064 | 82 | filp->f_iocb_flags = iocb_flags(filp); |
db1dd4d3 | 83 | spin_unlock(&filp->f_lock); |
76398425 | 84 | |
1da177e4 | 85 | out: |
1da177e4 LT |
86 | return error; |
87 | } | |
88 | ||
609d7fa9 | 89 | static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, |
2f38d70f | 90 | int force) |
1da177e4 | 91 | { |
80e1e823 | 92 | write_lock_irq(&filp->f_owner.lock); |
1da177e4 | 93 | if (force || !filp->f_owner.pid) { |
609d7fa9 EB |
94 | put_pid(filp->f_owner.pid); |
95 | filp->f_owner.pid = get_pid(pid); | |
96 | filp->f_owner.pid_type = type; | |
2f38d70f ON |
97 | |
98 | if (pid) { | |
99 | const struct cred *cred = current_cred(); | |
100 | filp->f_owner.uid = cred->uid; | |
101 | filp->f_owner.euid = cred->euid; | |
102 | } | |
1da177e4 | 103 | } |
80e1e823 | 104 | write_unlock_irq(&filp->f_owner.lock); |
1da177e4 LT |
105 | } |
106 | ||
e0b93edd | 107 | void __f_setown(struct file *filp, struct pid *pid, enum pid_type type, |
609d7fa9 | 108 | int force) |
1da177e4 | 109 | { |
e0b93edd | 110 | security_file_set_fowner(filp); |
2f38d70f | 111 | f_modown(filp, pid, type, force); |
1da177e4 | 112 | } |
609d7fa9 | 113 | EXPORT_SYMBOL(__f_setown); |
1da177e4 | 114 | |
393cc3f5 | 115 | int f_setown(struct file *filp, unsigned long arg, int force) |
609d7fa9 EB |
116 | { |
117 | enum pid_type type; | |
f7312735 JL |
118 | struct pid *pid = NULL; |
119 | int who = arg, ret = 0; | |
120 | ||
01919134 | 121 | type = PIDTYPE_TGID; |
609d7fa9 | 122 | if (who < 0) { |
fc3dc674 JS |
123 | /* avoid overflow below */ |
124 | if (who == INT_MIN) | |
125 | return -EINVAL; | |
126 | ||
609d7fa9 EB |
127 | type = PIDTYPE_PGID; |
128 | who = -who; | |
129 | } | |
f7312735 | 130 | |
609d7fa9 | 131 | rcu_read_lock(); |
f7312735 JL |
132 | if (who) { |
133 | pid = find_vpid(who); | |
134 | if (!pid) | |
135 | ret = -ESRCH; | |
136 | } | |
137 | ||
138 | if (!ret) | |
139 | __f_setown(filp, pid, type, force); | |
609d7fa9 | 140 | rcu_read_unlock(); |
393cc3f5 | 141 | |
f7312735 | 142 | return ret; |
609d7fa9 | 143 | } |
1da177e4 LT |
144 | EXPORT_SYMBOL(f_setown); |
145 | ||
146 | void f_delown(struct file *filp) | |
147 | { | |
01919134 | 148 | f_modown(filp, NULL, PIDTYPE_TGID, 1); |
609d7fa9 EB |
149 | } |
150 | ||
151 | pid_t f_getown(struct file *filp) | |
152 | { | |
cc4a3f88 | 153 | pid_t pid = 0; |
f671a691 DCZX |
154 | |
155 | read_lock_irq(&filp->f_owner.lock); | |
cc4a3f88 PT |
156 | rcu_read_lock(); |
157 | if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type)) { | |
158 | pid = pid_vnr(filp->f_owner.pid); | |
159 | if (filp->f_owner.pid_type == PIDTYPE_PGID) | |
160 | pid = -pid; | |
161 | } | |
162 | rcu_read_unlock(); | |
f671a691 | 163 | read_unlock_irq(&filp->f_owner.lock); |
609d7fa9 | 164 | return pid; |
1da177e4 LT |
165 | } |
166 | ||
ba0a6c9f PZ |
167 | static int f_setown_ex(struct file *filp, unsigned long arg) |
168 | { | |
63784dd0 | 169 | struct f_owner_ex __user *owner_p = (void __user *)arg; |
ba0a6c9f PZ |
170 | struct f_owner_ex owner; |
171 | struct pid *pid; | |
172 | int type; | |
173 | int ret; | |
174 | ||
175 | ret = copy_from_user(&owner, owner_p, sizeof(owner)); | |
176 | if (ret) | |
5b54470d | 177 | return -EFAULT; |
ba0a6c9f PZ |
178 | |
179 | switch (owner.type) { | |
180 | case F_OWNER_TID: | |
01919134 | 181 | type = PIDTYPE_PID; |
ba0a6c9f PZ |
182 | break; |
183 | ||
184 | case F_OWNER_PID: | |
01919134 | 185 | type = PIDTYPE_TGID; |
ba0a6c9f PZ |
186 | break; |
187 | ||
978b4053 | 188 | case F_OWNER_PGRP: |
ba0a6c9f PZ |
189 | type = PIDTYPE_PGID; |
190 | break; | |
191 | ||
192 | default: | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | rcu_read_lock(); | |
197 | pid = find_vpid(owner.pid); | |
198 | if (owner.pid && !pid) | |
199 | ret = -ESRCH; | |
200 | else | |
e0b93edd | 201 | __f_setown(filp, pid, type, 1); |
ba0a6c9f PZ |
202 | rcu_read_unlock(); |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | static int f_getown_ex(struct file *filp, unsigned long arg) | |
208 | { | |
63784dd0 | 209 | struct f_owner_ex __user *owner_p = (void __user *)arg; |
cc4a3f88 | 210 | struct f_owner_ex owner = {}; |
ba0a6c9f PZ |
211 | int ret = 0; |
212 | ||
f671a691 | 213 | read_lock_irq(&filp->f_owner.lock); |
cc4a3f88 PT |
214 | rcu_read_lock(); |
215 | if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type)) | |
216 | owner.pid = pid_vnr(filp->f_owner.pid); | |
217 | rcu_read_unlock(); | |
ba0a6c9f | 218 | switch (filp->f_owner.pid_type) { |
01919134 | 219 | case PIDTYPE_PID: |
ba0a6c9f PZ |
220 | owner.type = F_OWNER_TID; |
221 | break; | |
222 | ||
01919134 | 223 | case PIDTYPE_TGID: |
ba0a6c9f PZ |
224 | owner.type = F_OWNER_PID; |
225 | break; | |
226 | ||
227 | case PIDTYPE_PGID: | |
978b4053 | 228 | owner.type = F_OWNER_PGRP; |
ba0a6c9f PZ |
229 | break; |
230 | ||
231 | default: | |
232 | WARN_ON(1); | |
233 | ret = -EINVAL; | |
234 | break; | |
235 | } | |
f671a691 | 236 | read_unlock_irq(&filp->f_owner.lock); |
ba0a6c9f | 237 | |
5b54470d | 238 | if (!ret) { |
ba0a6c9f | 239 | ret = copy_to_user(owner_p, &owner, sizeof(owner)); |
5b54470d DC |
240 | if (ret) |
241 | ret = -EFAULT; | |
242 | } | |
ba0a6c9f PZ |
243 | return ret; |
244 | } | |
245 | ||
1d151c33 CG |
246 | #ifdef CONFIG_CHECKPOINT_RESTORE |
247 | static int f_getowner_uids(struct file *filp, unsigned long arg) | |
248 | { | |
249 | struct user_namespace *user_ns = current_user_ns(); | |
63784dd0 | 250 | uid_t __user *dst = (void __user *)arg; |
1d151c33 CG |
251 | uid_t src[2]; |
252 | int err; | |
253 | ||
f671a691 | 254 | read_lock_irq(&filp->f_owner.lock); |
1d151c33 CG |
255 | src[0] = from_kuid(user_ns, filp->f_owner.uid); |
256 | src[1] = from_kuid(user_ns, filp->f_owner.euid); | |
f671a691 | 257 | read_unlock_irq(&filp->f_owner.lock); |
1d151c33 CG |
258 | |
259 | err = put_user(src[0], &dst[0]); | |
260 | err |= put_user(src[1], &dst[1]); | |
261 | ||
262 | return err; | |
263 | } | |
264 | #else | |
265 | static int f_getowner_uids(struct file *filp, unsigned long arg) | |
266 | { | |
267 | return -EINVAL; | |
268 | } | |
269 | #endif | |
270 | ||
c75b1d94 JA |
271 | static bool rw_hint_valid(enum rw_hint hint) |
272 | { | |
273 | switch (hint) { | |
9a7f12ed | 274 | case RWH_WRITE_LIFE_NOT_SET: |
c75b1d94 JA |
275 | case RWH_WRITE_LIFE_NONE: |
276 | case RWH_WRITE_LIFE_SHORT: | |
277 | case RWH_WRITE_LIFE_MEDIUM: | |
278 | case RWH_WRITE_LIFE_LONG: | |
279 | case RWH_WRITE_LIFE_EXTREME: | |
280 | return true; | |
281 | default: | |
282 | return false; | |
283 | } | |
284 | } | |
285 | ||
286 | static long fcntl_rw_hint(struct file *file, unsigned int cmd, | |
287 | unsigned long arg) | |
288 | { | |
289 | struct inode *inode = file_inode(file); | |
e2003277 | 290 | u64 __user *argp = (u64 __user *)arg; |
c75b1d94 | 291 | enum rw_hint hint; |
5657cb07 | 292 | u64 h; |
c75b1d94 JA |
293 | |
294 | switch (cmd) { | |
c75b1d94 | 295 | case F_GET_RW_HINT: |
5657cb07 JA |
296 | h = inode->i_write_hint; |
297 | if (copy_to_user(argp, &h, sizeof(*argp))) | |
c75b1d94 JA |
298 | return -EFAULT; |
299 | return 0; | |
300 | case F_SET_RW_HINT: | |
5657cb07 | 301 | if (copy_from_user(&h, argp, sizeof(h))) |
c75b1d94 | 302 | return -EFAULT; |
5657cb07 | 303 | hint = (enum rw_hint) h; |
c75b1d94 JA |
304 | if (!rw_hint_valid(hint)) |
305 | return -EINVAL; | |
306 | ||
307 | inode_lock(inode); | |
308 | inode->i_write_hint = hint; | |
309 | inode_unlock(inode); | |
310 | return 0; | |
311 | default: | |
312 | return -EINVAL; | |
313 | } | |
314 | } | |
315 | ||
1da177e4 LT |
316 | static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, |
317 | struct file *filp) | |
318 | { | |
a75d30c7 CH |
319 | void __user *argp = (void __user *)arg; |
320 | struct flock flock; | |
1da177e4 LT |
321 | long err = -EINVAL; |
322 | ||
323 | switch (cmd) { | |
324 | case F_DUPFD: | |
fe17f22d AV |
325 | err = f_dupfd(arg, filp, 0); |
326 | break; | |
22d2b35b | 327 | case F_DUPFD_CLOEXEC: |
12197718 | 328 | err = f_dupfd(arg, filp, O_CLOEXEC); |
1da177e4 LT |
329 | break; |
330 | case F_GETFD: | |
331 | err = get_close_on_exec(fd) ? FD_CLOEXEC : 0; | |
332 | break; | |
333 | case F_SETFD: | |
334 | err = 0; | |
335 | set_close_on_exec(fd, arg & FD_CLOEXEC); | |
336 | break; | |
337 | case F_GETFL: | |
338 | err = filp->f_flags; | |
339 | break; | |
340 | case F_SETFL: | |
341 | err = setfl(fd, filp, arg); | |
342 | break; | |
5d50ffd7 JL |
343 | #if BITS_PER_LONG != 32 |
344 | /* 32-bit arches must use fcntl64() */ | |
0d3f7a2d | 345 | case F_OFD_GETLK: |
5d50ffd7 | 346 | #endif |
1da177e4 | 347 | case F_GETLK: |
a75d30c7 CH |
348 | if (copy_from_user(&flock, argp, sizeof(flock))) |
349 | return -EFAULT; | |
350 | err = fcntl_getlk(filp, cmd, &flock); | |
351 | if (!err && copy_to_user(argp, &flock, sizeof(flock))) | |
352 | return -EFAULT; | |
1da177e4 | 353 | break; |
5d50ffd7 JL |
354 | #if BITS_PER_LONG != 32 |
355 | /* 32-bit arches must use fcntl64() */ | |
0d3f7a2d JL |
356 | case F_OFD_SETLK: |
357 | case F_OFD_SETLKW: | |
df561f66 | 358 | fallthrough; |
e8865537 | 359 | #endif |
1da177e4 LT |
360 | case F_SETLK: |
361 | case F_SETLKW: | |
a75d30c7 CH |
362 | if (copy_from_user(&flock, argp, sizeof(flock))) |
363 | return -EFAULT; | |
364 | err = fcntl_setlk(fd, filp, cmd, &flock); | |
1da177e4 LT |
365 | break; |
366 | case F_GETOWN: | |
367 | /* | |
368 | * XXX If f_owner is a process group, the | |
369 | * negative return value will get converted | |
370 | * into an error. Oops. If we keep the | |
371 | * current syscall conventions, the only way | |
372 | * to fix this will be in libc. | |
373 | */ | |
609d7fa9 | 374 | err = f_getown(filp); |
1da177e4 LT |
375 | force_successful_syscall_return(); |
376 | break; | |
377 | case F_SETOWN: | |
393cc3f5 | 378 | err = f_setown(filp, arg, 1); |
1da177e4 | 379 | break; |
ba0a6c9f PZ |
380 | case F_GETOWN_EX: |
381 | err = f_getown_ex(filp, arg); | |
382 | break; | |
383 | case F_SETOWN_EX: | |
384 | err = f_setown_ex(filp, arg); | |
385 | break; | |
1d151c33 CG |
386 | case F_GETOWNER_UIDS: |
387 | err = f_getowner_uids(filp, arg); | |
388 | break; | |
1da177e4 LT |
389 | case F_GETSIG: |
390 | err = filp->f_owner.signum; | |
391 | break; | |
392 | case F_SETSIG: | |
393 | /* arg == 0 restores default behaviour. */ | |
7ed20e1a | 394 | if (!valid_signal(arg)) { |
1da177e4 LT |
395 | break; |
396 | } | |
397 | err = 0; | |
398 | filp->f_owner.signum = arg; | |
399 | break; | |
400 | case F_GETLEASE: | |
401 | err = fcntl_getlease(filp); | |
402 | break; | |
403 | case F_SETLEASE: | |
404 | err = fcntl_setlease(fd, filp, arg); | |
405 | break; | |
406 | case F_NOTIFY: | |
407 | err = fcntl_dirnotify(fd, filp, arg); | |
408 | break; | |
35f3d14d JA |
409 | case F_SETPIPE_SZ: |
410 | case F_GETPIPE_SZ: | |
411 | err = pipe_fcntl(filp, cmd, arg); | |
412 | break; | |
40e041a2 DH |
413 | case F_ADD_SEALS: |
414 | case F_GET_SEALS: | |
5aadc431 | 415 | err = memfd_fcntl(filp, cmd, arg); |
40e041a2 | 416 | break; |
c75b1d94 JA |
417 | case F_GET_RW_HINT: |
418 | case F_SET_RW_HINT: | |
c75b1d94 JA |
419 | err = fcntl_rw_hint(filp, cmd, arg); |
420 | break; | |
1da177e4 LT |
421 | default: |
422 | break; | |
423 | } | |
424 | return err; | |
425 | } | |
426 | ||
1abf0c71 AV |
427 | static int check_fcntl_cmd(unsigned cmd) |
428 | { | |
429 | switch (cmd) { | |
430 | case F_DUPFD: | |
431 | case F_DUPFD_CLOEXEC: | |
432 | case F_GETFD: | |
433 | case F_SETFD: | |
434 | case F_GETFL: | |
435 | return 1; | |
436 | } | |
437 | return 0; | |
438 | } | |
439 | ||
a26eab24 | 440 | SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
1da177e4 | 441 | { |
2903ff01 | 442 | struct fd f = fdget_raw(fd); |
1da177e4 LT |
443 | long err = -EBADF; |
444 | ||
2903ff01 | 445 | if (!f.file) |
1da177e4 LT |
446 | goto out; |
447 | ||
2903ff01 | 448 | if (unlikely(f.file->f_mode & FMODE_PATH)) { |
545ec2c7 AV |
449 | if (!check_fcntl_cmd(cmd)) |
450 | goto out1; | |
1abf0c71 AV |
451 | } |
452 | ||
2903ff01 | 453 | err = security_file_fcntl(f.file, cmd, arg); |
545ec2c7 | 454 | if (!err) |
2903ff01 | 455 | err = do_fcntl(fd, cmd, arg, f.file); |
1da177e4 | 456 | |
545ec2c7 | 457 | out1: |
2903ff01 | 458 | fdput(f); |
1da177e4 LT |
459 | out: |
460 | return err; | |
461 | } | |
462 | ||
463 | #if BITS_PER_LONG == 32 | |
a26eab24 HC |
464 | SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, |
465 | unsigned long, arg) | |
1da177e4 | 466 | { |
a75d30c7 | 467 | void __user *argp = (void __user *)arg; |
2903ff01 | 468 | struct fd f = fdget_raw(fd); |
a75d30c7 | 469 | struct flock64 flock; |
545ec2c7 | 470 | long err = -EBADF; |
1da177e4 | 471 | |
2903ff01 | 472 | if (!f.file) |
1da177e4 LT |
473 | goto out; |
474 | ||
2903ff01 | 475 | if (unlikely(f.file->f_mode & FMODE_PATH)) { |
545ec2c7 AV |
476 | if (!check_fcntl_cmd(cmd)) |
477 | goto out1; | |
1abf0c71 AV |
478 | } |
479 | ||
2903ff01 | 480 | err = security_file_fcntl(f.file, cmd, arg); |
545ec2c7 AV |
481 | if (err) |
482 | goto out1; | |
1da177e4 LT |
483 | |
484 | switch (cmd) { | |
5d50ffd7 | 485 | case F_GETLK64: |
0d3f7a2d | 486 | case F_OFD_GETLK: |
a75d30c7 CH |
487 | err = -EFAULT; |
488 | if (copy_from_user(&flock, argp, sizeof(flock))) | |
489 | break; | |
490 | err = fcntl_getlk64(f.file, cmd, &flock); | |
491 | if (!err && copy_to_user(argp, &flock, sizeof(flock))) | |
492 | err = -EFAULT; | |
5d50ffd7 JL |
493 | break; |
494 | case F_SETLK64: | |
495 | case F_SETLKW64: | |
0d3f7a2d JL |
496 | case F_OFD_SETLK: |
497 | case F_OFD_SETLKW: | |
a75d30c7 CH |
498 | err = -EFAULT; |
499 | if (copy_from_user(&flock, argp, sizeof(flock))) | |
500 | break; | |
501 | err = fcntl_setlk64(fd, f.file, cmd, &flock); | |
5d50ffd7 JL |
502 | break; |
503 | default: | |
504 | err = do_fcntl(fd, cmd, arg, f.file); | |
505 | break; | |
1da177e4 | 506 | } |
545ec2c7 | 507 | out1: |
2903ff01 | 508 | fdput(f); |
1da177e4 LT |
509 | out: |
510 | return err; | |
511 | } | |
512 | #endif | |
513 | ||
80f0cce6 | 514 | #ifdef CONFIG_COMPAT |
8c6657cb | 515 | /* careful - don't use anywhere else */ |
b59eea55 LT |
516 | #define copy_flock_fields(dst, src) \ |
517 | (dst)->l_type = (src)->l_type; \ | |
518 | (dst)->l_whence = (src)->l_whence; \ | |
519 | (dst)->l_start = (src)->l_start; \ | |
520 | (dst)->l_len = (src)->l_len; \ | |
521 | (dst)->l_pid = (src)->l_pid; | |
522 | ||
523 | static int get_compat_flock(struct flock *kfl, const struct compat_flock __user *ufl) | |
80f0cce6 | 524 | { |
8c6657cb AV |
525 | struct compat_flock fl; |
526 | ||
527 | if (copy_from_user(&fl, ufl, sizeof(struct compat_flock))) | |
80f0cce6 | 528 | return -EFAULT; |
b59eea55 | 529 | copy_flock_fields(kfl, &fl); |
80f0cce6 AV |
530 | return 0; |
531 | } | |
532 | ||
b59eea55 | 533 | static int get_compat_flock64(struct flock *kfl, const struct compat_flock64 __user *ufl) |
80f0cce6 | 534 | { |
8c6657cb AV |
535 | struct compat_flock64 fl; |
536 | ||
537 | if (copy_from_user(&fl, ufl, sizeof(struct compat_flock64))) | |
80f0cce6 | 538 | return -EFAULT; |
b59eea55 | 539 | copy_flock_fields(kfl, &fl); |
80f0cce6 AV |
540 | return 0; |
541 | } | |
542 | ||
b59eea55 | 543 | static int put_compat_flock(const struct flock *kfl, struct compat_flock __user *ufl) |
80f0cce6 | 544 | { |
8c6657cb AV |
545 | struct compat_flock fl; |
546 | ||
547 | memset(&fl, 0, sizeof(struct compat_flock)); | |
b59eea55 | 548 | copy_flock_fields(&fl, kfl); |
8c6657cb | 549 | if (copy_to_user(ufl, &fl, sizeof(struct compat_flock))) |
80f0cce6 AV |
550 | return -EFAULT; |
551 | return 0; | |
552 | } | |
80f0cce6 | 553 | |
b59eea55 | 554 | static int put_compat_flock64(const struct flock *kfl, struct compat_flock64 __user *ufl) |
80f0cce6 | 555 | { |
8c6657cb AV |
556 | struct compat_flock64 fl; |
557 | ||
4d2dc2cc JL |
558 | BUILD_BUG_ON(sizeof(kfl->l_start) > sizeof(ufl->l_start)); |
559 | BUILD_BUG_ON(sizeof(kfl->l_len) > sizeof(ufl->l_len)); | |
560 | ||
8c6657cb | 561 | memset(&fl, 0, sizeof(struct compat_flock64)); |
b59eea55 | 562 | copy_flock_fields(&fl, kfl); |
8c6657cb | 563 | if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64))) |
80f0cce6 AV |
564 | return -EFAULT; |
565 | return 0; | |
566 | } | |
8c6657cb | 567 | #undef copy_flock_fields |
80f0cce6 AV |
568 | |
569 | static unsigned int | |
570 | convert_fcntl_cmd(unsigned int cmd) | |
571 | { | |
572 | switch (cmd) { | |
573 | case F_GETLK64: | |
574 | return F_GETLK; | |
575 | case F_SETLK64: | |
576 | return F_SETLK; | |
577 | case F_SETLKW64: | |
578 | return F_SETLKW; | |
579 | } | |
580 | ||
581 | return cmd; | |
582 | } | |
583 | ||
94073ad7 CH |
584 | /* |
585 | * GETLK was successful and we need to return the data, but it needs to fit in | |
586 | * the compat structure. | |
587 | * l_start shouldn't be too big, unless the original start + end is greater than | |
588 | * COMPAT_OFF_T_MAX, in which case the app was asking for trouble, so we return | |
589 | * -EOVERFLOW in that case. l_len could be too big, in which case we just | |
590 | * truncate it, and only allow the app to see that part of the conflicting lock | |
591 | * that might make sense to it anyway | |
592 | */ | |
593 | static int fixup_compat_flock(struct flock *flock) | |
594 | { | |
595 | if (flock->l_start > COMPAT_OFF_T_MAX) | |
596 | return -EOVERFLOW; | |
597 | if (flock->l_len > COMPAT_OFF_T_MAX) | |
598 | flock->l_len = COMPAT_OFF_T_MAX; | |
599 | return 0; | |
600 | } | |
601 | ||
e02af2ff DB |
602 | static long do_compat_fcntl64(unsigned int fd, unsigned int cmd, |
603 | compat_ulong_t arg) | |
80f0cce6 | 604 | { |
94073ad7 CH |
605 | struct fd f = fdget_raw(fd); |
606 | struct flock flock; | |
607 | long err = -EBADF; | |
608 | ||
609 | if (!f.file) | |
610 | return err; | |
611 | ||
612 | if (unlikely(f.file->f_mode & FMODE_PATH)) { | |
613 | if (!check_fcntl_cmd(cmd)) | |
614 | goto out_put; | |
615 | } | |
616 | ||
617 | err = security_file_fcntl(f.file, cmd, arg); | |
618 | if (err) | |
619 | goto out_put; | |
80f0cce6 AV |
620 | |
621 | switch (cmd) { | |
622 | case F_GETLK: | |
94073ad7 CH |
623 | err = get_compat_flock(&flock, compat_ptr(arg)); |
624 | if (err) | |
625 | break; | |
626 | err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock); | |
627 | if (err) | |
628 | break; | |
629 | err = fixup_compat_flock(&flock); | |
9280a601 JL |
630 | if (!err) |
631 | err = put_compat_flock(&flock, compat_ptr(arg)); | |
94073ad7 CH |
632 | break; |
633 | case F_GETLK64: | |
634 | case F_OFD_GETLK: | |
635 | err = get_compat_flock64(&flock, compat_ptr(arg)); | |
636 | if (err) | |
637 | break; | |
638 | err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock); | |
4d2dc2cc JL |
639 | if (!err) |
640 | err = put_compat_flock64(&flock, compat_ptr(arg)); | |
94073ad7 | 641 | break; |
80f0cce6 AV |
642 | case F_SETLK: |
643 | case F_SETLKW: | |
94073ad7 CH |
644 | err = get_compat_flock(&flock, compat_ptr(arg)); |
645 | if (err) | |
80f0cce6 | 646 | break; |
94073ad7 | 647 | err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); |
80f0cce6 | 648 | break; |
80f0cce6 AV |
649 | case F_SETLK64: |
650 | case F_SETLKW64: | |
80f0cce6 AV |
651 | case F_OFD_SETLK: |
652 | case F_OFD_SETLKW: | |
94073ad7 CH |
653 | err = get_compat_flock64(&flock, compat_ptr(arg)); |
654 | if (err) | |
80f0cce6 | 655 | break; |
94073ad7 | 656 | err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); |
80f0cce6 | 657 | break; |
80f0cce6 | 658 | default: |
94073ad7 | 659 | err = do_fcntl(fd, cmd, arg, f.file); |
80f0cce6 AV |
660 | break; |
661 | } | |
94073ad7 CH |
662 | out_put: |
663 | fdput(f); | |
664 | return err; | |
80f0cce6 AV |
665 | } |
666 | ||
e02af2ff DB |
667 | COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, |
668 | compat_ulong_t, arg) | |
669 | { | |
670 | return do_compat_fcntl64(fd, cmd, arg); | |
671 | } | |
672 | ||
80f0cce6 AV |
673 | COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, |
674 | compat_ulong_t, arg) | |
675 | { | |
676 | switch (cmd) { | |
677 | case F_GETLK64: | |
678 | case F_SETLK64: | |
679 | case F_SETLKW64: | |
680 | case F_OFD_GETLK: | |
681 | case F_OFD_SETLK: | |
682 | case F_OFD_SETLKW: | |
683 | return -EINVAL; | |
684 | } | |
e02af2ff | 685 | return do_compat_fcntl64(fd, cmd, arg); |
80f0cce6 AV |
686 | } |
687 | #endif | |
688 | ||
1da177e4 LT |
689 | /* Table to convert sigio signal codes into poll band bitmaps */ |
690 | ||
5dc533c6 | 691 | static const __poll_t band_table[NSIGPOLL] = { |
a9a08845 LT |
692 | EPOLLIN | EPOLLRDNORM, /* POLL_IN */ |
693 | EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND, /* POLL_OUT */ | |
694 | EPOLLIN | EPOLLRDNORM | EPOLLMSG, /* POLL_MSG */ | |
695 | EPOLLERR, /* POLL_ERR */ | |
696 | EPOLLPRI | EPOLLRDBAND, /* POLL_PRI */ | |
697 | EPOLLHUP | EPOLLERR /* POLL_HUP */ | |
1da177e4 LT |
698 | }; |
699 | ||
700 | static inline int sigio_perm(struct task_struct *p, | |
701 | struct fown_struct *fown, int sig) | |
702 | { | |
c69e8d9c DH |
703 | const struct cred *cred; |
704 | int ret; | |
705 | ||
706 | rcu_read_lock(); | |
707 | cred = __task_cred(p); | |
8e96e3b7 EB |
708 | ret = ((uid_eq(fown->euid, GLOBAL_ROOT_UID) || |
709 | uid_eq(fown->euid, cred->suid) || uid_eq(fown->euid, cred->uid) || | |
710 | uid_eq(fown->uid, cred->suid) || uid_eq(fown->uid, cred->uid)) && | |
c69e8d9c DH |
711 | !security_file_send_sigiotask(p, fown, sig)); |
712 | rcu_read_unlock(); | |
713 | return ret; | |
1da177e4 LT |
714 | } |
715 | ||
716 | static void send_sigio_to_task(struct task_struct *p, | |
8eeee4e2 | 717 | struct fown_struct *fown, |
9c2db007 | 718 | int fd, int reason, enum pid_type type) |
1da177e4 | 719 | { |
8eeee4e2 ON |
720 | /* |
721 | * F_SETSIG can change ->signum lockless in parallel, make | |
722 | * sure we read it once and use the same value throughout. | |
723 | */ | |
6aa7de05 | 724 | int signum = READ_ONCE(fown->signum); |
8eeee4e2 ON |
725 | |
726 | if (!sigio_perm(p, fown, signum)) | |
1da177e4 LT |
727 | return; |
728 | ||
8eeee4e2 | 729 | switch (signum) { |
0a68ff5e KC |
730 | default: { |
731 | kernel_siginfo_t si; | |
732 | ||
1da177e4 LT |
733 | /* Queue a rt signal with the appropriate fd as its |
734 | value. We use SI_SIGIO as the source, not | |
735 | SI_KERNEL, since kernel signals always get | |
736 | delivered even if we can't queue. Failure to | |
737 | queue in this case _should_ be reported; we fall | |
738 | back to SIGIO in that case. --sct */ | |
faf1f22b | 739 | clear_siginfo(&si); |
8eeee4e2 | 740 | si.si_signo = signum; |
1da177e4 LT |
741 | si.si_errno = 0; |
742 | si.si_code = reason; | |
d08477aa EB |
743 | /* |
744 | * Posix definies POLL_IN and friends to be signal | |
745 | * specific si_codes for SIG_POLL. Linux extended | |
746 | * these si_codes to other signals in a way that is | |
747 | * ambiguous if other signals also have signal | |
748 | * specific si_codes. In that case use SI_SIGIO instead | |
749 | * to remove the ambiguity. | |
750 | */ | |
54640d23 | 751 | if ((signum != SIGPOLL) && sig_specific_sicodes(signum)) |
d08477aa EB |
752 | si.si_code = SI_SIGIO; |
753 | ||
1da177e4 LT |
754 | /* Make sure we are called with one of the POLL_* |
755 | reasons, otherwise we could leak kernel stack into | |
756 | userspace. */ | |
d08477aa | 757 | BUG_ON((reason < POLL_IN) || ((reason - POLL_IN) >= NSIGPOLL)); |
1da177e4 LT |
758 | if (reason - POLL_IN >= NSIGPOLL) |
759 | si.si_band = ~0L; | |
760 | else | |
c71d227f | 761 | si.si_band = mangle_poll(band_table[reason - POLL_IN]); |
1da177e4 | 762 | si.si_fd = fd; |
40b3b025 | 763 | if (!do_send_sig_info(signum, &si, p, type)) |
1da177e4 | 764 | break; |
0a68ff5e | 765 | } |
df561f66 | 766 | fallthrough; /* fall back on the old plain SIGIO signal */ |
1da177e4 | 767 | case 0: |
40b3b025 | 768 | do_send_sig_info(SIGIO, SEND_SIG_PRIV, p, type); |
1da177e4 LT |
769 | } |
770 | } | |
771 | ||
772 | void send_sigio(struct fown_struct *fown, int fd, int band) | |
773 | { | |
774 | struct task_struct *p; | |
609d7fa9 | 775 | enum pid_type type; |
8d1ddb5e | 776 | unsigned long flags; |
609d7fa9 | 777 | struct pid *pid; |
1da177e4 | 778 | |
8d1ddb5e | 779 | read_lock_irqsave(&fown->lock, flags); |
ba0a6c9f | 780 | |
609d7fa9 | 781 | type = fown->pid_type; |
1da177e4 LT |
782 | pid = fown->pid; |
783 | if (!pid) | |
784 | goto out_unlock_fown; | |
01919134 EB |
785 | |
786 | if (type <= PIDTYPE_TGID) { | |
787 | rcu_read_lock(); | |
788 | p = pid_task(pid, PIDTYPE_PID); | |
84fe4cc0 EB |
789 | if (p) |
790 | send_sigio_to_task(p, fown, fd, band, type); | |
01919134 EB |
791 | rcu_read_unlock(); |
792 | } else { | |
793 | read_lock(&tasklist_lock); | |
794 | do_each_pid_task(pid, type, p) { | |
9c2db007 | 795 | send_sigio_to_task(p, fown, fd, band, type); |
01919134 EB |
796 | } while_each_pid_task(pid, type, p); |
797 | read_unlock(&tasklist_lock); | |
798 | } | |
1da177e4 | 799 | out_unlock_fown: |
8d1ddb5e | 800 | read_unlock_irqrestore(&fown->lock, flags); |
1da177e4 LT |
801 | } |
802 | ||
803 | static void send_sigurg_to_task(struct task_struct *p, | |
9c2db007 | 804 | struct fown_struct *fown, enum pid_type type) |
1da177e4 LT |
805 | { |
806 | if (sigio_perm(p, fown, SIGURG)) | |
40b3b025 | 807 | do_send_sig_info(SIGURG, SEND_SIG_PRIV, p, type); |
1da177e4 LT |
808 | } |
809 | ||
810 | int send_sigurg(struct fown_struct *fown) | |
811 | { | |
812 | struct task_struct *p; | |
609d7fa9 EB |
813 | enum pid_type type; |
814 | struct pid *pid; | |
8d1ddb5e | 815 | unsigned long flags; |
609d7fa9 | 816 | int ret = 0; |
1da177e4 | 817 | |
8d1ddb5e | 818 | read_lock_irqsave(&fown->lock, flags); |
ba0a6c9f | 819 | |
609d7fa9 | 820 | type = fown->pid_type; |
1da177e4 LT |
821 | pid = fown->pid; |
822 | if (!pid) | |
823 | goto out_unlock_fown; | |
824 | ||
825 | ret = 1; | |
01919134 EB |
826 | |
827 | if (type <= PIDTYPE_TGID) { | |
828 | rcu_read_lock(); | |
829 | p = pid_task(pid, PIDTYPE_PID); | |
84fe4cc0 EB |
830 | if (p) |
831 | send_sigurg_to_task(p, fown, type); | |
01919134 EB |
832 | rcu_read_unlock(); |
833 | } else { | |
834 | read_lock(&tasklist_lock); | |
835 | do_each_pid_task(pid, type, p) { | |
9c2db007 | 836 | send_sigurg_to_task(p, fown, type); |
01919134 EB |
837 | } while_each_pid_task(pid, type, p); |
838 | read_unlock(&tasklist_lock); | |
839 | } | |
1da177e4 | 840 | out_unlock_fown: |
8d1ddb5e | 841 | read_unlock_irqrestore(&fown->lock, flags); |
1da177e4 LT |
842 | return ret; |
843 | } | |
844 | ||
989a2979 | 845 | static DEFINE_SPINLOCK(fasync_lock); |
e18b890b | 846 | static struct kmem_cache *fasync_cache __read_mostly; |
1da177e4 | 847 | |
989a2979 ED |
848 | static void fasync_free_rcu(struct rcu_head *head) |
849 | { | |
850 | kmem_cache_free(fasync_cache, | |
851 | container_of(head, struct fasync_struct, fa_rcu)); | |
852 | } | |
853 | ||
1da177e4 | 854 | /* |
53281b6d LT |
855 | * Remove a fasync entry. If successfully removed, return |
856 | * positive and clear the FASYNC flag. If no entry exists, | |
857 | * do nothing and return 0. | |
858 | * | |
859 | * NOTE! It is very important that the FASYNC flag always | |
860 | * match the state "is the filp on a fasync list". | |
861 | * | |
1da177e4 | 862 | */ |
f7347ce4 | 863 | int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp) |
1da177e4 LT |
864 | { |
865 | struct fasync_struct *fa, **fp; | |
1da177e4 LT |
866 | int result = 0; |
867 | ||
53281b6d | 868 | spin_lock(&filp->f_lock); |
989a2979 | 869 | spin_lock(&fasync_lock); |
53281b6d LT |
870 | for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { |
871 | if (fa->fa_file != filp) | |
872 | continue; | |
989a2979 | 873 | |
7a107c0f | 874 | write_lock_irq(&fa->fa_lock); |
989a2979 | 875 | fa->fa_file = NULL; |
7a107c0f | 876 | write_unlock_irq(&fa->fa_lock); |
989a2979 | 877 | |
53281b6d | 878 | *fp = fa->fa_next; |
989a2979 | 879 | call_rcu(&fa->fa_rcu, fasync_free_rcu); |
53281b6d LT |
880 | filp->f_flags &= ~FASYNC; |
881 | result = 1; | |
882 | break; | |
1da177e4 | 883 | } |
989a2979 | 884 | spin_unlock(&fasync_lock); |
53281b6d LT |
885 | spin_unlock(&filp->f_lock); |
886 | return result; | |
887 | } | |
888 | ||
f7347ce4 LT |
889 | struct fasync_struct *fasync_alloc(void) |
890 | { | |
891 | return kmem_cache_alloc(fasync_cache, GFP_KERNEL); | |
892 | } | |
893 | ||
53281b6d | 894 | /* |
f7347ce4 LT |
895 | * NOTE! This can be used only for unused fasync entries: |
896 | * entries that actually got inserted on the fasync list | |
897 | * need to be released by rcu - see fasync_remove_entry. | |
53281b6d | 898 | */ |
f7347ce4 | 899 | void fasync_free(struct fasync_struct *new) |
53281b6d | 900 | { |
f7347ce4 LT |
901 | kmem_cache_free(fasync_cache, new); |
902 | } | |
53281b6d | 903 | |
f7347ce4 LT |
904 | /* |
905 | * Insert a new entry into the fasync list. Return the pointer to the | |
906 | * old one if we didn't use the new one. | |
55f335a8 LT |
907 | * |
908 | * NOTE! It is very important that the FASYNC flag always | |
909 | * match the state "is the filp on a fasync list". | |
f7347ce4 LT |
910 | */ |
911 | struct fasync_struct *fasync_insert_entry(int fd, struct file *filp, struct fasync_struct **fapp, struct fasync_struct *new) | |
912 | { | |
913 | struct fasync_struct *fa, **fp; | |
4a6a4499 | 914 | |
4a6a4499 | 915 | spin_lock(&filp->f_lock); |
989a2979 | 916 | spin_lock(&fasync_lock); |
1da177e4 | 917 | for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { |
53281b6d LT |
918 | if (fa->fa_file != filp) |
919 | continue; | |
989a2979 | 920 | |
7a107c0f | 921 | write_lock_irq(&fa->fa_lock); |
53281b6d | 922 | fa->fa_fd = fd; |
7a107c0f | 923 | write_unlock_irq(&fa->fa_lock); |
53281b6d | 924 | goto out; |
1da177e4 LT |
925 | } |
926 | ||
7a107c0f | 927 | rwlock_init(&new->fa_lock); |
53281b6d LT |
928 | new->magic = FASYNC_MAGIC; |
929 | new->fa_file = filp; | |
930 | new->fa_fd = fd; | |
931 | new->fa_next = *fapp; | |
989a2979 | 932 | rcu_assign_pointer(*fapp, new); |
53281b6d LT |
933 | filp->f_flags |= FASYNC; |
934 | ||
1da177e4 | 935 | out: |
989a2979 | 936 | spin_unlock(&fasync_lock); |
4a6a4499 | 937 | spin_unlock(&filp->f_lock); |
f7347ce4 LT |
938 | return fa; |
939 | } | |
940 | ||
941 | /* | |
942 | * Add a fasync entry. Return negative on error, positive if | |
943 | * added, and zero if did nothing but change an existing one. | |
f7347ce4 LT |
944 | */ |
945 | static int fasync_add_entry(int fd, struct file *filp, struct fasync_struct **fapp) | |
946 | { | |
947 | struct fasync_struct *new; | |
948 | ||
949 | new = fasync_alloc(); | |
950 | if (!new) | |
951 | return -ENOMEM; | |
952 | ||
953 | /* | |
954 | * fasync_insert_entry() returns the old (update) entry if | |
955 | * it existed. | |
956 | * | |
957 | * So free the (unused) new entry and return 0 to let the | |
958 | * caller know that we didn't add any new fasync entries. | |
959 | */ | |
960 | if (fasync_insert_entry(fd, filp, fapp, new)) { | |
961 | fasync_free(new); | |
962 | return 0; | |
963 | } | |
964 | ||
965 | return 1; | |
1da177e4 LT |
966 | } |
967 | ||
53281b6d LT |
968 | /* |
969 | * fasync_helper() is used by almost all character device drivers | |
970 | * to set up the fasync queue, and for regular files by the file | |
971 | * lease code. It returns negative on error, 0 if it did no changes | |
972 | * and positive if it added/deleted the entry. | |
973 | */ | |
974 | int fasync_helper(int fd, struct file * filp, int on, struct fasync_struct **fapp) | |
975 | { | |
976 | if (!on) | |
977 | return fasync_remove_entry(filp, fapp); | |
978 | return fasync_add_entry(fd, filp, fapp); | |
979 | } | |
980 | ||
1da177e4 LT |
981 | EXPORT_SYMBOL(fasync_helper); |
982 | ||
989a2979 ED |
983 | /* |
984 | * rcu_read_lock() is held | |
985 | */ | |
986 | static void kill_fasync_rcu(struct fasync_struct *fa, int sig, int band) | |
1da177e4 LT |
987 | { |
988 | while (fa) { | |
989a2979 | 989 | struct fown_struct *fown; |
2f488f69 | 990 | unsigned long flags; |
f4985dc7 | 991 | |
1da177e4 LT |
992 | if (fa->magic != FASYNC_MAGIC) { |
993 | printk(KERN_ERR "kill_fasync: bad magic number in " | |
994 | "fasync_struct!\n"); | |
995 | return; | |
996 | } | |
2f488f69 | 997 | read_lock_irqsave(&fa->fa_lock, flags); |
989a2979 ED |
998 | if (fa->fa_file) { |
999 | fown = &fa->fa_file->f_owner; | |
1000 | /* Don't send SIGURG to processes which have not set a | |
1001 | queued signum: SIGURG has its own default signalling | |
1002 | mechanism. */ | |
1003 | if (!(sig == SIGURG && fown->signum == 0)) | |
1004 | send_sigio(fown, fa->fa_fd, band); | |
1005 | } | |
2f488f69 | 1006 | read_unlock_irqrestore(&fa->fa_lock, flags); |
989a2979 | 1007 | fa = rcu_dereference(fa->fa_next); |
1da177e4 LT |
1008 | } |
1009 | } | |
1010 | ||
1da177e4 LT |
1011 | void kill_fasync(struct fasync_struct **fp, int sig, int band) |
1012 | { | |
1013 | /* First a quick test without locking: usually | |
1014 | * the list is empty. | |
1015 | */ | |
1016 | if (*fp) { | |
989a2979 ED |
1017 | rcu_read_lock(); |
1018 | kill_fasync_rcu(rcu_dereference(*fp), sig, band); | |
1019 | rcu_read_unlock(); | |
1da177e4 LT |
1020 | } |
1021 | } | |
1022 | EXPORT_SYMBOL(kill_fasync); | |
1023 | ||
454eedb8 | 1024 | static int __init fcntl_init(void) |
1da177e4 | 1025 | { |
3ab04d5c JB |
1026 | /* |
1027 | * Please add new bits here to ensure allocation uniqueness. | |
1028 | * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY | |
1029 | * is defined as O_NONBLOCK on some platforms and not on others. | |
1030 | */ | |
80f18379 CH |
1031 | BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != |
1032 | HWEIGHT32( | |
1033 | (VALID_OPEN_FLAGS & ~(O_NONBLOCK | O_NDELAY)) | | |
1034 | __FMODE_EXEC | __FMODE_NONOTIFY)); | |
454eedb8 | 1035 | |
1da177e4 | 1036 | fasync_cache = kmem_cache_create("fasync_cache", |
839d6820 VA |
1037 | sizeof(struct fasync_struct), 0, |
1038 | SLAB_PANIC | SLAB_ACCOUNT, NULL); | |
1da177e4 LT |
1039 | return 0; |
1040 | } | |
1041 | ||
454eedb8 | 1042 | module_init(fcntl_init) |