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