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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 | 35 | |
7fea21ae | 36 | int setfl(int fd, struct file *filp, unsigned long arg) |
1da177e4 | 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 */ |
45063097 | 59 | if (!S_ISFIFO(inode->i_mode) && (arg & O_DIRECT)) { |
1da177e4 LT |
60 | if (!filp->f_mapping || !filp->f_mapping->a_ops || |
61 | !filp->f_mapping->a_ops->direct_IO) | |
62 | return -EINVAL; | |
63 | } | |
64 | ||
72c2d531 | 65 | if (filp->f_op->check_flags) |
1da177e4 | 66 | error = filp->f_op->check_flags(arg); |
7fea21ae AR |
67 | if (!error && filp->f_op->setfl) |
68 | error = filp->f_op->setfl(filp, arg); | |
1da177e4 LT |
69 | if (error) |
70 | return error; | |
71 | ||
218d11a8 | 72 | /* |
76398425 | 73 | * ->fasync() is responsible for setting the FASYNC bit. |
218d11a8 | 74 | */ |
72c2d531 | 75 | if (((arg ^ filp->f_flags) & FASYNC) && filp->f_op->fasync) { |
76398425 JC |
76 | error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0); |
77 | if (error < 0) | |
78 | goto out; | |
60aa4924 JC |
79 | if (error > 0) |
80 | error = 0; | |
1da177e4 | 81 | } |
db1dd4d3 | 82 | spin_lock(&filp->f_lock); |
1da177e4 | 83 | filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK); |
db1dd4d3 | 84 | spin_unlock(&filp->f_lock); |
76398425 | 85 | |
1da177e4 | 86 | out: |
1da177e4 LT |
87 | return error; |
88 | } | |
7fea21ae | 89 | EXPORT_SYMBOL_GPL(setfl); |
1da177e4 | 90 | |
609d7fa9 | 91 | static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, |
2f38d70f | 92 | int force) |
1da177e4 | 93 | { |
80e1e823 | 94 | write_lock_irq(&filp->f_owner.lock); |
1da177e4 | 95 | if (force || !filp->f_owner.pid) { |
609d7fa9 EB |
96 | put_pid(filp->f_owner.pid); |
97 | filp->f_owner.pid = get_pid(pid); | |
98 | filp->f_owner.pid_type = type; | |
2f38d70f ON |
99 | |
100 | if (pid) { | |
101 | const struct cred *cred = current_cred(); | |
102 | filp->f_owner.uid = cred->uid; | |
103 | filp->f_owner.euid = cred->euid; | |
104 | } | |
1da177e4 | 105 | } |
80e1e823 | 106 | write_unlock_irq(&filp->f_owner.lock); |
1da177e4 LT |
107 | } |
108 | ||
e0b93edd | 109 | void __f_setown(struct file *filp, struct pid *pid, enum pid_type type, |
609d7fa9 | 110 | int force) |
1da177e4 | 111 | { |
e0b93edd | 112 | security_file_set_fowner(filp); |
2f38d70f | 113 | f_modown(filp, pid, type, force); |
1da177e4 | 114 | } |
609d7fa9 | 115 | EXPORT_SYMBOL(__f_setown); |
1da177e4 | 116 | |
393cc3f5 | 117 | int f_setown(struct file *filp, unsigned long arg, int force) |
609d7fa9 EB |
118 | { |
119 | enum pid_type type; | |
f7312735 JL |
120 | struct pid *pid = NULL; |
121 | int who = arg, ret = 0; | |
122 | ||
01919134 | 123 | type = PIDTYPE_TGID; |
609d7fa9 | 124 | if (who < 0) { |
fc3dc674 JS |
125 | /* avoid overflow below */ |
126 | if (who == INT_MIN) | |
127 | return -EINVAL; | |
128 | ||
609d7fa9 EB |
129 | type = PIDTYPE_PGID; |
130 | who = -who; | |
131 | } | |
f7312735 | 132 | |
609d7fa9 | 133 | rcu_read_lock(); |
f7312735 JL |
134 | if (who) { |
135 | pid = find_vpid(who); | |
136 | if (!pid) | |
137 | ret = -ESRCH; | |
138 | } | |
139 | ||
140 | if (!ret) | |
141 | __f_setown(filp, pid, type, force); | |
609d7fa9 | 142 | rcu_read_unlock(); |
393cc3f5 | 143 | |
f7312735 | 144 | return ret; |
609d7fa9 | 145 | } |
1da177e4 LT |
146 | EXPORT_SYMBOL(f_setown); |
147 | ||
148 | void f_delown(struct file *filp) | |
149 | { | |
01919134 | 150 | f_modown(filp, NULL, PIDTYPE_TGID, 1); |
609d7fa9 EB |
151 | } |
152 | ||
153 | pid_t f_getown(struct file *filp) | |
154 | { | |
cc4a3f88 | 155 | pid_t pid = 0; |
f671a691 DCZX |
156 | |
157 | read_lock_irq(&filp->f_owner.lock); | |
cc4a3f88 PT |
158 | rcu_read_lock(); |
159 | if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type)) { | |
160 | pid = pid_vnr(filp->f_owner.pid); | |
161 | if (filp->f_owner.pid_type == PIDTYPE_PGID) | |
162 | pid = -pid; | |
163 | } | |
164 | rcu_read_unlock(); | |
f671a691 | 165 | read_unlock_irq(&filp->f_owner.lock); |
609d7fa9 | 166 | return pid; |
1da177e4 LT |
167 | } |
168 | ||
ba0a6c9f PZ |
169 | static int f_setown_ex(struct file *filp, unsigned long arg) |
170 | { | |
63784dd0 | 171 | struct f_owner_ex __user *owner_p = (void __user *)arg; |
ba0a6c9f PZ |
172 | struct f_owner_ex owner; |
173 | struct pid *pid; | |
174 | int type; | |
175 | int ret; | |
176 | ||
177 | ret = copy_from_user(&owner, owner_p, sizeof(owner)); | |
178 | if (ret) | |
5b54470d | 179 | return -EFAULT; |
ba0a6c9f PZ |
180 | |
181 | switch (owner.type) { | |
182 | case F_OWNER_TID: | |
01919134 | 183 | type = PIDTYPE_PID; |
ba0a6c9f PZ |
184 | break; |
185 | ||
186 | case F_OWNER_PID: | |
01919134 | 187 | type = PIDTYPE_TGID; |
ba0a6c9f PZ |
188 | break; |
189 | ||
978b4053 | 190 | case F_OWNER_PGRP: |
ba0a6c9f PZ |
191 | type = PIDTYPE_PGID; |
192 | break; | |
193 | ||
194 | default: | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | rcu_read_lock(); | |
199 | pid = find_vpid(owner.pid); | |
200 | if (owner.pid && !pid) | |
201 | ret = -ESRCH; | |
202 | else | |
e0b93edd | 203 | __f_setown(filp, pid, type, 1); |
ba0a6c9f PZ |
204 | rcu_read_unlock(); |
205 | ||
206 | return ret; | |
207 | } | |
208 | ||
209 | static int f_getown_ex(struct file *filp, unsigned long arg) | |
210 | { | |
63784dd0 | 211 | struct f_owner_ex __user *owner_p = (void __user *)arg; |
cc4a3f88 | 212 | struct f_owner_ex owner = {}; |
ba0a6c9f PZ |
213 | int ret = 0; |
214 | ||
f671a691 | 215 | read_lock_irq(&filp->f_owner.lock); |
cc4a3f88 PT |
216 | rcu_read_lock(); |
217 | if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type)) | |
218 | owner.pid = pid_vnr(filp->f_owner.pid); | |
219 | rcu_read_unlock(); | |
ba0a6c9f | 220 | switch (filp->f_owner.pid_type) { |
01919134 | 221 | case PIDTYPE_PID: |
ba0a6c9f PZ |
222 | owner.type = F_OWNER_TID; |
223 | break; | |
224 | ||
01919134 | 225 | case PIDTYPE_TGID: |
ba0a6c9f PZ |
226 | owner.type = F_OWNER_PID; |
227 | break; | |
228 | ||
229 | case PIDTYPE_PGID: | |
978b4053 | 230 | owner.type = F_OWNER_PGRP; |
ba0a6c9f PZ |
231 | break; |
232 | ||
233 | default: | |
234 | WARN_ON(1); | |
235 | ret = -EINVAL; | |
236 | break; | |
237 | } | |
f671a691 | 238 | read_unlock_irq(&filp->f_owner.lock); |
ba0a6c9f | 239 | |
5b54470d | 240 | if (!ret) { |
ba0a6c9f | 241 | ret = copy_to_user(owner_p, &owner, sizeof(owner)); |
5b54470d DC |
242 | if (ret) |
243 | ret = -EFAULT; | |
244 | } | |
ba0a6c9f PZ |
245 | return ret; |
246 | } | |
247 | ||
1d151c33 CG |
248 | #ifdef CONFIG_CHECKPOINT_RESTORE |
249 | static int f_getowner_uids(struct file *filp, unsigned long arg) | |
250 | { | |
251 | struct user_namespace *user_ns = current_user_ns(); | |
63784dd0 | 252 | uid_t __user *dst = (void __user *)arg; |
1d151c33 CG |
253 | uid_t src[2]; |
254 | int err; | |
255 | ||
f671a691 | 256 | read_lock_irq(&filp->f_owner.lock); |
1d151c33 CG |
257 | src[0] = from_kuid(user_ns, filp->f_owner.uid); |
258 | src[1] = from_kuid(user_ns, filp->f_owner.euid); | |
f671a691 | 259 | read_unlock_irq(&filp->f_owner.lock); |
1d151c33 CG |
260 | |
261 | err = put_user(src[0], &dst[0]); | |
262 | err |= put_user(src[1], &dst[1]); | |
263 | ||
264 | return err; | |
265 | } | |
266 | #else | |
267 | static int f_getowner_uids(struct file *filp, unsigned long arg) | |
268 | { | |
269 | return -EINVAL; | |
270 | } | |
271 | #endif | |
272 | ||
c75b1d94 JA |
273 | static bool rw_hint_valid(enum rw_hint hint) |
274 | { | |
275 | switch (hint) { | |
9a7f12ed | 276 | case RWH_WRITE_LIFE_NOT_SET: |
c75b1d94 JA |
277 | case RWH_WRITE_LIFE_NONE: |
278 | case RWH_WRITE_LIFE_SHORT: | |
279 | case RWH_WRITE_LIFE_MEDIUM: | |
280 | case RWH_WRITE_LIFE_LONG: | |
281 | case RWH_WRITE_LIFE_EXTREME: | |
282 | return true; | |
283 | default: | |
284 | return false; | |
285 | } | |
286 | } | |
287 | ||
288 | static long fcntl_rw_hint(struct file *file, unsigned int cmd, | |
289 | unsigned long arg) | |
290 | { | |
291 | struct inode *inode = file_inode(file); | |
e2003277 | 292 | u64 __user *argp = (u64 __user *)arg; |
c75b1d94 | 293 | enum rw_hint hint; |
5657cb07 | 294 | u64 h; |
c75b1d94 JA |
295 | |
296 | switch (cmd) { | |
297 | case F_GET_FILE_RW_HINT: | |
5657cb07 JA |
298 | h = file_write_hint(file); |
299 | if (copy_to_user(argp, &h, sizeof(*argp))) | |
c75b1d94 JA |
300 | return -EFAULT; |
301 | return 0; | |
302 | case F_SET_FILE_RW_HINT: | |
5657cb07 | 303 | if (copy_from_user(&h, argp, sizeof(h))) |
c75b1d94 | 304 | return -EFAULT; |
5657cb07 | 305 | hint = (enum rw_hint) h; |
c75b1d94 JA |
306 | if (!rw_hint_valid(hint)) |
307 | return -EINVAL; | |
308 | ||
309 | spin_lock(&file->f_lock); | |
310 | file->f_write_hint = hint; | |
311 | spin_unlock(&file->f_lock); | |
312 | return 0; | |
313 | case F_GET_RW_HINT: | |
5657cb07 JA |
314 | h = inode->i_write_hint; |
315 | if (copy_to_user(argp, &h, sizeof(*argp))) | |
c75b1d94 JA |
316 | return -EFAULT; |
317 | return 0; | |
318 | case F_SET_RW_HINT: | |
5657cb07 | 319 | if (copy_from_user(&h, argp, sizeof(h))) |
c75b1d94 | 320 | return -EFAULT; |
5657cb07 | 321 | hint = (enum rw_hint) h; |
c75b1d94 JA |
322 | if (!rw_hint_valid(hint)) |
323 | return -EINVAL; | |
324 | ||
325 | inode_lock(inode); | |
326 | inode->i_write_hint = hint; | |
327 | inode_unlock(inode); | |
328 | return 0; | |
329 | default: | |
330 | return -EINVAL; | |
331 | } | |
332 | } | |
333 | ||
1da177e4 LT |
334 | static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, |
335 | struct file *filp) | |
336 | { | |
a75d30c7 CH |
337 | void __user *argp = (void __user *)arg; |
338 | struct flock flock; | |
1da177e4 LT |
339 | long err = -EINVAL; |
340 | ||
341 | switch (cmd) { | |
342 | case F_DUPFD: | |
fe17f22d AV |
343 | err = f_dupfd(arg, filp, 0); |
344 | break; | |
22d2b35b | 345 | case F_DUPFD_CLOEXEC: |
12197718 | 346 | err = f_dupfd(arg, filp, O_CLOEXEC); |
1da177e4 LT |
347 | break; |
348 | case F_GETFD: | |
349 | err = get_close_on_exec(fd) ? FD_CLOEXEC : 0; | |
350 | break; | |
351 | case F_SETFD: | |
352 | err = 0; | |
353 | set_close_on_exec(fd, arg & FD_CLOEXEC); | |
354 | break; | |
355 | case F_GETFL: | |
356 | err = filp->f_flags; | |
357 | break; | |
358 | case F_SETFL: | |
359 | err = setfl(fd, filp, arg); | |
360 | break; | |
5d50ffd7 JL |
361 | #if BITS_PER_LONG != 32 |
362 | /* 32-bit arches must use fcntl64() */ | |
0d3f7a2d | 363 | case F_OFD_GETLK: |
5d50ffd7 | 364 | #endif |
1da177e4 | 365 | case F_GETLK: |
a75d30c7 CH |
366 | if (copy_from_user(&flock, argp, sizeof(flock))) |
367 | return -EFAULT; | |
368 | err = fcntl_getlk(filp, cmd, &flock); | |
369 | if (!err && copy_to_user(argp, &flock, sizeof(flock))) | |
370 | return -EFAULT; | |
1da177e4 | 371 | break; |
5d50ffd7 JL |
372 | #if BITS_PER_LONG != 32 |
373 | /* 32-bit arches must use fcntl64() */ | |
0d3f7a2d JL |
374 | case F_OFD_SETLK: |
375 | case F_OFD_SETLKW: | |
df561f66 | 376 | fallthrough; |
e8865537 | 377 | #endif |
1da177e4 LT |
378 | case F_SETLK: |
379 | case F_SETLKW: | |
a75d30c7 CH |
380 | if (copy_from_user(&flock, argp, sizeof(flock))) |
381 | return -EFAULT; | |
382 | err = fcntl_setlk(fd, filp, cmd, &flock); | |
1da177e4 LT |
383 | break; |
384 | case F_GETOWN: | |
385 | /* | |
386 | * XXX If f_owner is a process group, the | |
387 | * negative return value will get converted | |
388 | * into an error. Oops. If we keep the | |
389 | * current syscall conventions, the only way | |
390 | * to fix this will be in libc. | |
391 | */ | |
609d7fa9 | 392 | err = f_getown(filp); |
1da177e4 LT |
393 | force_successful_syscall_return(); |
394 | break; | |
395 | case F_SETOWN: | |
393cc3f5 | 396 | err = f_setown(filp, arg, 1); |
1da177e4 | 397 | break; |
ba0a6c9f PZ |
398 | case F_GETOWN_EX: |
399 | err = f_getown_ex(filp, arg); | |
400 | break; | |
401 | case F_SETOWN_EX: | |
402 | err = f_setown_ex(filp, arg); | |
403 | break; | |
1d151c33 CG |
404 | case F_GETOWNER_UIDS: |
405 | err = f_getowner_uids(filp, arg); | |
406 | break; | |
1da177e4 LT |
407 | case F_GETSIG: |
408 | err = filp->f_owner.signum; | |
409 | break; | |
410 | case F_SETSIG: | |
411 | /* arg == 0 restores default behaviour. */ | |
7ed20e1a | 412 | if (!valid_signal(arg)) { |
1da177e4 LT |
413 | break; |
414 | } | |
415 | err = 0; | |
416 | filp->f_owner.signum = arg; | |
417 | break; | |
418 | case F_GETLEASE: | |
419 | err = fcntl_getlease(filp); | |
420 | break; | |
421 | case F_SETLEASE: | |
422 | err = fcntl_setlease(fd, filp, arg); | |
423 | break; | |
424 | case F_NOTIFY: | |
425 | err = fcntl_dirnotify(fd, filp, arg); | |
426 | break; | |
35f3d14d JA |
427 | case F_SETPIPE_SZ: |
428 | case F_GETPIPE_SZ: | |
429 | err = pipe_fcntl(filp, cmd, arg); | |
430 | break; | |
40e041a2 DH |
431 | case F_ADD_SEALS: |
432 | case F_GET_SEALS: | |
5aadc431 | 433 | err = memfd_fcntl(filp, cmd, arg); |
40e041a2 | 434 | break; |
c75b1d94 JA |
435 | case F_GET_RW_HINT: |
436 | case F_SET_RW_HINT: | |
437 | case F_GET_FILE_RW_HINT: | |
438 | case F_SET_FILE_RW_HINT: | |
439 | err = fcntl_rw_hint(filp, cmd, arg); | |
440 | break; | |
1da177e4 LT |
441 | default: |
442 | break; | |
443 | } | |
444 | return err; | |
445 | } | |
446 | ||
1abf0c71 AV |
447 | static int check_fcntl_cmd(unsigned cmd) |
448 | { | |
449 | switch (cmd) { | |
450 | case F_DUPFD: | |
451 | case F_DUPFD_CLOEXEC: | |
452 | case F_GETFD: | |
453 | case F_SETFD: | |
454 | case F_GETFL: | |
455 | return 1; | |
456 | } | |
457 | return 0; | |
458 | } | |
459 | ||
a26eab24 | 460 | SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
1da177e4 | 461 | { |
2903ff01 | 462 | struct fd f = fdget_raw(fd); |
1da177e4 LT |
463 | long err = -EBADF; |
464 | ||
2903ff01 | 465 | if (!f.file) |
1da177e4 LT |
466 | goto out; |
467 | ||
2903ff01 | 468 | if (unlikely(f.file->f_mode & FMODE_PATH)) { |
545ec2c7 AV |
469 | if (!check_fcntl_cmd(cmd)) |
470 | goto out1; | |
1abf0c71 AV |
471 | } |
472 | ||
2903ff01 | 473 | err = security_file_fcntl(f.file, cmd, arg); |
545ec2c7 | 474 | if (!err) |
2903ff01 | 475 | err = do_fcntl(fd, cmd, arg, f.file); |
1da177e4 | 476 | |
545ec2c7 | 477 | out1: |
2903ff01 | 478 | fdput(f); |
1da177e4 LT |
479 | out: |
480 | return err; | |
481 | } | |
482 | ||
483 | #if BITS_PER_LONG == 32 | |
a26eab24 HC |
484 | SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, |
485 | unsigned long, arg) | |
1da177e4 | 486 | { |
a75d30c7 | 487 | void __user *argp = (void __user *)arg; |
2903ff01 | 488 | struct fd f = fdget_raw(fd); |
a75d30c7 | 489 | struct flock64 flock; |
545ec2c7 | 490 | long err = -EBADF; |
1da177e4 | 491 | |
2903ff01 | 492 | if (!f.file) |
1da177e4 LT |
493 | goto out; |
494 | ||
2903ff01 | 495 | if (unlikely(f.file->f_mode & FMODE_PATH)) { |
545ec2c7 AV |
496 | if (!check_fcntl_cmd(cmd)) |
497 | goto out1; | |
1abf0c71 AV |
498 | } |
499 | ||
2903ff01 | 500 | err = security_file_fcntl(f.file, cmd, arg); |
545ec2c7 AV |
501 | if (err) |
502 | goto out1; | |
1da177e4 LT |
503 | |
504 | switch (cmd) { | |
5d50ffd7 | 505 | case F_GETLK64: |
0d3f7a2d | 506 | case F_OFD_GETLK: |
a75d30c7 CH |
507 | err = -EFAULT; |
508 | if (copy_from_user(&flock, argp, sizeof(flock))) | |
509 | break; | |
510 | err = fcntl_getlk64(f.file, cmd, &flock); | |
511 | if (!err && copy_to_user(argp, &flock, sizeof(flock))) | |
512 | err = -EFAULT; | |
5d50ffd7 JL |
513 | break; |
514 | case F_SETLK64: | |
515 | case F_SETLKW64: | |
0d3f7a2d JL |
516 | case F_OFD_SETLK: |
517 | case F_OFD_SETLKW: | |
a75d30c7 CH |
518 | err = -EFAULT; |
519 | if (copy_from_user(&flock, argp, sizeof(flock))) | |
520 | break; | |
521 | err = fcntl_setlk64(fd, f.file, cmd, &flock); | |
5d50ffd7 JL |
522 | break; |
523 | default: | |
524 | err = do_fcntl(fd, cmd, arg, f.file); | |
525 | break; | |
1da177e4 | 526 | } |
545ec2c7 | 527 | out1: |
2903ff01 | 528 | fdput(f); |
1da177e4 LT |
529 | out: |
530 | return err; | |
531 | } | |
532 | #endif | |
533 | ||
80f0cce6 | 534 | #ifdef CONFIG_COMPAT |
8c6657cb | 535 | /* careful - don't use anywhere else */ |
b59eea55 LT |
536 | #define copy_flock_fields(dst, src) \ |
537 | (dst)->l_type = (src)->l_type; \ | |
538 | (dst)->l_whence = (src)->l_whence; \ | |
539 | (dst)->l_start = (src)->l_start; \ | |
540 | (dst)->l_len = (src)->l_len; \ | |
541 | (dst)->l_pid = (src)->l_pid; | |
542 | ||
543 | static int get_compat_flock(struct flock *kfl, const struct compat_flock __user *ufl) | |
80f0cce6 | 544 | { |
8c6657cb AV |
545 | struct compat_flock fl; |
546 | ||
547 | if (copy_from_user(&fl, ufl, sizeof(struct compat_flock))) | |
80f0cce6 | 548 | return -EFAULT; |
b59eea55 | 549 | copy_flock_fields(kfl, &fl); |
80f0cce6 AV |
550 | return 0; |
551 | } | |
552 | ||
b59eea55 | 553 | static int get_compat_flock64(struct flock *kfl, const struct compat_flock64 __user *ufl) |
80f0cce6 | 554 | { |
8c6657cb AV |
555 | struct compat_flock64 fl; |
556 | ||
557 | if (copy_from_user(&fl, ufl, sizeof(struct compat_flock64))) | |
80f0cce6 | 558 | return -EFAULT; |
b59eea55 | 559 | copy_flock_fields(kfl, &fl); |
80f0cce6 AV |
560 | return 0; |
561 | } | |
562 | ||
b59eea55 | 563 | static int put_compat_flock(const struct flock *kfl, struct compat_flock __user *ufl) |
80f0cce6 | 564 | { |
8c6657cb AV |
565 | struct compat_flock fl; |
566 | ||
567 | memset(&fl, 0, sizeof(struct compat_flock)); | |
b59eea55 | 568 | copy_flock_fields(&fl, kfl); |
8c6657cb | 569 | if (copy_to_user(ufl, &fl, sizeof(struct compat_flock))) |
80f0cce6 AV |
570 | return -EFAULT; |
571 | return 0; | |
572 | } | |
80f0cce6 | 573 | |
b59eea55 | 574 | static int put_compat_flock64(const struct flock *kfl, struct compat_flock64 __user *ufl) |
80f0cce6 | 575 | { |
8c6657cb AV |
576 | struct compat_flock64 fl; |
577 | ||
4d2dc2cc JL |
578 | BUILD_BUG_ON(sizeof(kfl->l_start) > sizeof(ufl->l_start)); |
579 | BUILD_BUG_ON(sizeof(kfl->l_len) > sizeof(ufl->l_len)); | |
580 | ||
8c6657cb | 581 | memset(&fl, 0, sizeof(struct compat_flock64)); |
b59eea55 | 582 | copy_flock_fields(&fl, kfl); |
8c6657cb | 583 | if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64))) |
80f0cce6 AV |
584 | return -EFAULT; |
585 | return 0; | |
586 | } | |
8c6657cb | 587 | #undef copy_flock_fields |
80f0cce6 AV |
588 | |
589 | static unsigned int | |
590 | convert_fcntl_cmd(unsigned int cmd) | |
591 | { | |
592 | switch (cmd) { | |
593 | case F_GETLK64: | |
594 | return F_GETLK; | |
595 | case F_SETLK64: | |
596 | return F_SETLK; | |
597 | case F_SETLKW64: | |
598 | return F_SETLKW; | |
599 | } | |
600 | ||
601 | return cmd; | |
602 | } | |
603 | ||
94073ad7 CH |
604 | /* |
605 | * GETLK was successful and we need to return the data, but it needs to fit in | |
606 | * the compat structure. | |
607 | * l_start shouldn't be too big, unless the original start + end is greater than | |
608 | * COMPAT_OFF_T_MAX, in which case the app was asking for trouble, so we return | |
609 | * -EOVERFLOW in that case. l_len could be too big, in which case we just | |
610 | * truncate it, and only allow the app to see that part of the conflicting lock | |
611 | * that might make sense to it anyway | |
612 | */ | |
613 | static int fixup_compat_flock(struct flock *flock) | |
614 | { | |
615 | if (flock->l_start > COMPAT_OFF_T_MAX) | |
616 | return -EOVERFLOW; | |
617 | if (flock->l_len > COMPAT_OFF_T_MAX) | |
618 | flock->l_len = COMPAT_OFF_T_MAX; | |
619 | return 0; | |
620 | } | |
621 | ||
e02af2ff DB |
622 | static long do_compat_fcntl64(unsigned int fd, unsigned int cmd, |
623 | compat_ulong_t arg) | |
80f0cce6 | 624 | { |
94073ad7 CH |
625 | struct fd f = fdget_raw(fd); |
626 | struct flock flock; | |
627 | long err = -EBADF; | |
628 | ||
629 | if (!f.file) | |
630 | return err; | |
631 | ||
632 | if (unlikely(f.file->f_mode & FMODE_PATH)) { | |
633 | if (!check_fcntl_cmd(cmd)) | |
634 | goto out_put; | |
635 | } | |
636 | ||
637 | err = security_file_fcntl(f.file, cmd, arg); | |
638 | if (err) | |
639 | goto out_put; | |
80f0cce6 AV |
640 | |
641 | switch (cmd) { | |
642 | case F_GETLK: | |
94073ad7 CH |
643 | err = get_compat_flock(&flock, compat_ptr(arg)); |
644 | if (err) | |
645 | break; | |
646 | err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock); | |
647 | if (err) | |
648 | break; | |
649 | err = fixup_compat_flock(&flock); | |
9280a601 JL |
650 | if (!err) |
651 | err = put_compat_flock(&flock, compat_ptr(arg)); | |
94073ad7 CH |
652 | break; |
653 | case F_GETLK64: | |
654 | case F_OFD_GETLK: | |
655 | err = get_compat_flock64(&flock, compat_ptr(arg)); | |
656 | if (err) | |
657 | break; | |
658 | err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock); | |
4d2dc2cc JL |
659 | if (!err) |
660 | err = put_compat_flock64(&flock, compat_ptr(arg)); | |
94073ad7 | 661 | break; |
80f0cce6 AV |
662 | case F_SETLK: |
663 | case F_SETLKW: | |
94073ad7 CH |
664 | err = get_compat_flock(&flock, compat_ptr(arg)); |
665 | if (err) | |
80f0cce6 | 666 | break; |
94073ad7 | 667 | err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); |
80f0cce6 | 668 | break; |
80f0cce6 AV |
669 | case F_SETLK64: |
670 | case F_SETLKW64: | |
80f0cce6 AV |
671 | case F_OFD_SETLK: |
672 | case F_OFD_SETLKW: | |
94073ad7 CH |
673 | err = get_compat_flock64(&flock, compat_ptr(arg)); |
674 | if (err) | |
80f0cce6 | 675 | break; |
94073ad7 | 676 | err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); |
80f0cce6 | 677 | break; |
80f0cce6 | 678 | default: |
94073ad7 | 679 | err = do_fcntl(fd, cmd, arg, f.file); |
80f0cce6 AV |
680 | break; |
681 | } | |
94073ad7 CH |
682 | out_put: |
683 | fdput(f); | |
684 | return err; | |
80f0cce6 AV |
685 | } |
686 | ||
e02af2ff DB |
687 | COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, |
688 | compat_ulong_t, arg) | |
689 | { | |
690 | return do_compat_fcntl64(fd, cmd, arg); | |
691 | } | |
692 | ||
80f0cce6 AV |
693 | COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, |
694 | compat_ulong_t, arg) | |
695 | { | |
696 | switch (cmd) { | |
697 | case F_GETLK64: | |
698 | case F_SETLK64: | |
699 | case F_SETLKW64: | |
700 | case F_OFD_GETLK: | |
701 | case F_OFD_SETLK: | |
702 | case F_OFD_SETLKW: | |
703 | return -EINVAL; | |
704 | } | |
e02af2ff | 705 | return do_compat_fcntl64(fd, cmd, arg); |
80f0cce6 AV |
706 | } |
707 | #endif | |
708 | ||
1da177e4 LT |
709 | /* Table to convert sigio signal codes into poll band bitmaps */ |
710 | ||
5dc533c6 | 711 | static const __poll_t band_table[NSIGPOLL] = { |
a9a08845 LT |
712 | EPOLLIN | EPOLLRDNORM, /* POLL_IN */ |
713 | EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND, /* POLL_OUT */ | |
714 | EPOLLIN | EPOLLRDNORM | EPOLLMSG, /* POLL_MSG */ | |
715 | EPOLLERR, /* POLL_ERR */ | |
716 | EPOLLPRI | EPOLLRDBAND, /* POLL_PRI */ | |
717 | EPOLLHUP | EPOLLERR /* POLL_HUP */ | |
1da177e4 LT |
718 | }; |
719 | ||
720 | static inline int sigio_perm(struct task_struct *p, | |
721 | struct fown_struct *fown, int sig) | |
722 | { | |
c69e8d9c DH |
723 | const struct cred *cred; |
724 | int ret; | |
725 | ||
726 | rcu_read_lock(); | |
727 | cred = __task_cred(p); | |
8e96e3b7 EB |
728 | ret = ((uid_eq(fown->euid, GLOBAL_ROOT_UID) || |
729 | uid_eq(fown->euid, cred->suid) || uid_eq(fown->euid, cred->uid) || | |
730 | uid_eq(fown->uid, cred->suid) || uid_eq(fown->uid, cred->uid)) && | |
c69e8d9c DH |
731 | !security_file_send_sigiotask(p, fown, sig)); |
732 | rcu_read_unlock(); | |
733 | return ret; | |
1da177e4 LT |
734 | } |
735 | ||
736 | static void send_sigio_to_task(struct task_struct *p, | |
8eeee4e2 | 737 | struct fown_struct *fown, |
9c2db007 | 738 | int fd, int reason, enum pid_type type) |
1da177e4 | 739 | { |
8eeee4e2 ON |
740 | /* |
741 | * F_SETSIG can change ->signum lockless in parallel, make | |
742 | * sure we read it once and use the same value throughout. | |
743 | */ | |
6aa7de05 | 744 | int signum = READ_ONCE(fown->signum); |
8eeee4e2 ON |
745 | |
746 | if (!sigio_perm(p, fown, signum)) | |
1da177e4 LT |
747 | return; |
748 | ||
8eeee4e2 | 749 | switch (signum) { |
0a68ff5e KC |
750 | default: { |
751 | kernel_siginfo_t si; | |
752 | ||
1da177e4 LT |
753 | /* Queue a rt signal with the appropriate fd as its |
754 | value. We use SI_SIGIO as the source, not | |
755 | SI_KERNEL, since kernel signals always get | |
756 | delivered even if we can't queue. Failure to | |
757 | queue in this case _should_ be reported; we fall | |
758 | back to SIGIO in that case. --sct */ | |
faf1f22b | 759 | clear_siginfo(&si); |
8eeee4e2 | 760 | si.si_signo = signum; |
1da177e4 LT |
761 | si.si_errno = 0; |
762 | si.si_code = reason; | |
d08477aa EB |
763 | /* |
764 | * Posix definies POLL_IN and friends to be signal | |
765 | * specific si_codes for SIG_POLL. Linux extended | |
766 | * these si_codes to other signals in a way that is | |
767 | * ambiguous if other signals also have signal | |
768 | * specific si_codes. In that case use SI_SIGIO instead | |
769 | * to remove the ambiguity. | |
770 | */ | |
54640d23 | 771 | if ((signum != SIGPOLL) && sig_specific_sicodes(signum)) |
d08477aa EB |
772 | si.si_code = SI_SIGIO; |
773 | ||
1da177e4 LT |
774 | /* Make sure we are called with one of the POLL_* |
775 | reasons, otherwise we could leak kernel stack into | |
776 | userspace. */ | |
d08477aa | 777 | BUG_ON((reason < POLL_IN) || ((reason - POLL_IN) >= NSIGPOLL)); |
1da177e4 LT |
778 | if (reason - POLL_IN >= NSIGPOLL) |
779 | si.si_band = ~0L; | |
780 | else | |
c71d227f | 781 | si.si_band = mangle_poll(band_table[reason - POLL_IN]); |
1da177e4 | 782 | si.si_fd = fd; |
40b3b025 | 783 | if (!do_send_sig_info(signum, &si, p, type)) |
1da177e4 | 784 | break; |
0a68ff5e | 785 | } |
df561f66 | 786 | fallthrough; /* fall back on the old plain SIGIO signal */ |
1da177e4 | 787 | case 0: |
40b3b025 | 788 | do_send_sig_info(SIGIO, SEND_SIG_PRIV, p, type); |
1da177e4 LT |
789 | } |
790 | } | |
791 | ||
792 | void send_sigio(struct fown_struct *fown, int fd, int band) | |
793 | { | |
794 | struct task_struct *p; | |
609d7fa9 | 795 | enum pid_type type; |
8d1ddb5e | 796 | unsigned long flags; |
609d7fa9 | 797 | struct pid *pid; |
1da177e4 | 798 | |
8d1ddb5e | 799 | read_lock_irqsave(&fown->lock, flags); |
ba0a6c9f | 800 | |
609d7fa9 | 801 | type = fown->pid_type; |
1da177e4 LT |
802 | pid = fown->pid; |
803 | if (!pid) | |
804 | goto out_unlock_fown; | |
01919134 EB |
805 | |
806 | if (type <= PIDTYPE_TGID) { | |
807 | rcu_read_lock(); | |
808 | p = pid_task(pid, PIDTYPE_PID); | |
84fe4cc0 EB |
809 | if (p) |
810 | send_sigio_to_task(p, fown, fd, band, type); | |
01919134 EB |
811 | rcu_read_unlock(); |
812 | } else { | |
813 | read_lock(&tasklist_lock); | |
814 | do_each_pid_task(pid, type, p) { | |
9c2db007 | 815 | send_sigio_to_task(p, fown, fd, band, type); |
01919134 EB |
816 | } while_each_pid_task(pid, type, p); |
817 | read_unlock(&tasklist_lock); | |
818 | } | |
1da177e4 | 819 | out_unlock_fown: |
8d1ddb5e | 820 | read_unlock_irqrestore(&fown->lock, flags); |
1da177e4 LT |
821 | } |
822 | ||
823 | static void send_sigurg_to_task(struct task_struct *p, | |
9c2db007 | 824 | struct fown_struct *fown, enum pid_type type) |
1da177e4 LT |
825 | { |
826 | if (sigio_perm(p, fown, SIGURG)) | |
40b3b025 | 827 | do_send_sig_info(SIGURG, SEND_SIG_PRIV, p, type); |
1da177e4 LT |
828 | } |
829 | ||
830 | int send_sigurg(struct fown_struct *fown) | |
831 | { | |
832 | struct task_struct *p; | |
609d7fa9 EB |
833 | enum pid_type type; |
834 | struct pid *pid; | |
8d1ddb5e | 835 | unsigned long flags; |
609d7fa9 | 836 | int ret = 0; |
1da177e4 | 837 | |
8d1ddb5e | 838 | read_lock_irqsave(&fown->lock, flags); |
ba0a6c9f | 839 | |
609d7fa9 | 840 | type = fown->pid_type; |
1da177e4 LT |
841 | pid = fown->pid; |
842 | if (!pid) | |
843 | goto out_unlock_fown; | |
844 | ||
845 | ret = 1; | |
01919134 EB |
846 | |
847 | if (type <= PIDTYPE_TGID) { | |
848 | rcu_read_lock(); | |
849 | p = pid_task(pid, PIDTYPE_PID); | |
84fe4cc0 EB |
850 | if (p) |
851 | send_sigurg_to_task(p, fown, type); | |
01919134 EB |
852 | rcu_read_unlock(); |
853 | } else { | |
854 | read_lock(&tasklist_lock); | |
855 | do_each_pid_task(pid, type, p) { | |
9c2db007 | 856 | send_sigurg_to_task(p, fown, type); |
01919134 EB |
857 | } while_each_pid_task(pid, type, p); |
858 | read_unlock(&tasklist_lock); | |
859 | } | |
1da177e4 | 860 | out_unlock_fown: |
8d1ddb5e | 861 | read_unlock_irqrestore(&fown->lock, flags); |
1da177e4 LT |
862 | return ret; |
863 | } | |
864 | ||
989a2979 | 865 | static DEFINE_SPINLOCK(fasync_lock); |
e18b890b | 866 | static struct kmem_cache *fasync_cache __read_mostly; |
1da177e4 | 867 | |
989a2979 ED |
868 | static void fasync_free_rcu(struct rcu_head *head) |
869 | { | |
870 | kmem_cache_free(fasync_cache, | |
871 | container_of(head, struct fasync_struct, fa_rcu)); | |
872 | } | |
873 | ||
1da177e4 | 874 | /* |
53281b6d LT |
875 | * Remove a fasync entry. If successfully removed, return |
876 | * positive and clear the FASYNC flag. If no entry exists, | |
877 | * do nothing and return 0. | |
878 | * | |
879 | * NOTE! It is very important that the FASYNC flag always | |
880 | * match the state "is the filp on a fasync list". | |
881 | * | |
1da177e4 | 882 | */ |
f7347ce4 | 883 | int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp) |
1da177e4 LT |
884 | { |
885 | struct fasync_struct *fa, **fp; | |
1da177e4 LT |
886 | int result = 0; |
887 | ||
53281b6d | 888 | spin_lock(&filp->f_lock); |
989a2979 | 889 | spin_lock(&fasync_lock); |
53281b6d LT |
890 | for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { |
891 | if (fa->fa_file != filp) | |
892 | continue; | |
989a2979 | 893 | |
7a107c0f | 894 | write_lock_irq(&fa->fa_lock); |
989a2979 | 895 | fa->fa_file = NULL; |
7a107c0f | 896 | write_unlock_irq(&fa->fa_lock); |
989a2979 | 897 | |
53281b6d | 898 | *fp = fa->fa_next; |
989a2979 | 899 | call_rcu(&fa->fa_rcu, fasync_free_rcu); |
53281b6d LT |
900 | filp->f_flags &= ~FASYNC; |
901 | result = 1; | |
902 | break; | |
1da177e4 | 903 | } |
989a2979 | 904 | spin_unlock(&fasync_lock); |
53281b6d LT |
905 | spin_unlock(&filp->f_lock); |
906 | return result; | |
907 | } | |
908 | ||
f7347ce4 LT |
909 | struct fasync_struct *fasync_alloc(void) |
910 | { | |
911 | return kmem_cache_alloc(fasync_cache, GFP_KERNEL); | |
912 | } | |
913 | ||
53281b6d | 914 | /* |
f7347ce4 LT |
915 | * NOTE! This can be used only for unused fasync entries: |
916 | * entries that actually got inserted on the fasync list | |
917 | * need to be released by rcu - see fasync_remove_entry. | |
53281b6d | 918 | */ |
f7347ce4 | 919 | void fasync_free(struct fasync_struct *new) |
53281b6d | 920 | { |
f7347ce4 LT |
921 | kmem_cache_free(fasync_cache, new); |
922 | } | |
53281b6d | 923 | |
f7347ce4 LT |
924 | /* |
925 | * Insert a new entry into the fasync list. Return the pointer to the | |
926 | * old one if we didn't use the new one. | |
55f335a8 LT |
927 | * |
928 | * NOTE! It is very important that the FASYNC flag always | |
929 | * match the state "is the filp on a fasync list". | |
f7347ce4 LT |
930 | */ |
931 | struct fasync_struct *fasync_insert_entry(int fd, struct file *filp, struct fasync_struct **fapp, struct fasync_struct *new) | |
932 | { | |
933 | struct fasync_struct *fa, **fp; | |
4a6a4499 | 934 | |
4a6a4499 | 935 | spin_lock(&filp->f_lock); |
989a2979 | 936 | spin_lock(&fasync_lock); |
1da177e4 | 937 | for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { |
53281b6d LT |
938 | if (fa->fa_file != filp) |
939 | continue; | |
989a2979 | 940 | |
7a107c0f | 941 | write_lock_irq(&fa->fa_lock); |
53281b6d | 942 | fa->fa_fd = fd; |
7a107c0f | 943 | write_unlock_irq(&fa->fa_lock); |
53281b6d | 944 | goto out; |
1da177e4 LT |
945 | } |
946 | ||
7a107c0f | 947 | rwlock_init(&new->fa_lock); |
53281b6d LT |
948 | new->magic = FASYNC_MAGIC; |
949 | new->fa_file = filp; | |
950 | new->fa_fd = fd; | |
951 | new->fa_next = *fapp; | |
989a2979 | 952 | rcu_assign_pointer(*fapp, new); |
53281b6d LT |
953 | filp->f_flags |= FASYNC; |
954 | ||
1da177e4 | 955 | out: |
989a2979 | 956 | spin_unlock(&fasync_lock); |
4a6a4499 | 957 | spin_unlock(&filp->f_lock); |
f7347ce4 LT |
958 | return fa; |
959 | } | |
960 | ||
961 | /* | |
962 | * Add a fasync entry. Return negative on error, positive if | |
963 | * added, and zero if did nothing but change an existing one. | |
f7347ce4 LT |
964 | */ |
965 | static int fasync_add_entry(int fd, struct file *filp, struct fasync_struct **fapp) | |
966 | { | |
967 | struct fasync_struct *new; | |
968 | ||
969 | new = fasync_alloc(); | |
970 | if (!new) | |
971 | return -ENOMEM; | |
972 | ||
973 | /* | |
974 | * fasync_insert_entry() returns the old (update) entry if | |
975 | * it existed. | |
976 | * | |
977 | * So free the (unused) new entry and return 0 to let the | |
978 | * caller know that we didn't add any new fasync entries. | |
979 | */ | |
980 | if (fasync_insert_entry(fd, filp, fapp, new)) { | |
981 | fasync_free(new); | |
982 | return 0; | |
983 | } | |
984 | ||
985 | return 1; | |
1da177e4 LT |
986 | } |
987 | ||
53281b6d LT |
988 | /* |
989 | * fasync_helper() is used by almost all character device drivers | |
990 | * to set up the fasync queue, and for regular files by the file | |
991 | * lease code. It returns negative on error, 0 if it did no changes | |
992 | * and positive if it added/deleted the entry. | |
993 | */ | |
994 | int fasync_helper(int fd, struct file * filp, int on, struct fasync_struct **fapp) | |
995 | { | |
996 | if (!on) | |
997 | return fasync_remove_entry(filp, fapp); | |
998 | return fasync_add_entry(fd, filp, fapp); | |
999 | } | |
1000 | ||
1da177e4 LT |
1001 | EXPORT_SYMBOL(fasync_helper); |
1002 | ||
989a2979 ED |
1003 | /* |
1004 | * rcu_read_lock() is held | |
1005 | */ | |
1006 | static void kill_fasync_rcu(struct fasync_struct *fa, int sig, int band) | |
1da177e4 LT |
1007 | { |
1008 | while (fa) { | |
989a2979 | 1009 | struct fown_struct *fown; |
2f488f69 | 1010 | unsigned long flags; |
f4985dc7 | 1011 | |
1da177e4 LT |
1012 | if (fa->magic != FASYNC_MAGIC) { |
1013 | printk(KERN_ERR "kill_fasync: bad magic number in " | |
1014 | "fasync_struct!\n"); | |
1015 | return; | |
1016 | } | |
2f488f69 | 1017 | read_lock_irqsave(&fa->fa_lock, flags); |
989a2979 ED |
1018 | if (fa->fa_file) { |
1019 | fown = &fa->fa_file->f_owner; | |
1020 | /* Don't send SIGURG to processes which have not set a | |
1021 | queued signum: SIGURG has its own default signalling | |
1022 | mechanism. */ | |
1023 | if (!(sig == SIGURG && fown->signum == 0)) | |
1024 | send_sigio(fown, fa->fa_fd, band); | |
1025 | } | |
2f488f69 | 1026 | read_unlock_irqrestore(&fa->fa_lock, flags); |
989a2979 | 1027 | fa = rcu_dereference(fa->fa_next); |
1da177e4 LT |
1028 | } |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | void kill_fasync(struct fasync_struct **fp, int sig, int band) |
1032 | { | |
1033 | /* First a quick test without locking: usually | |
1034 | * the list is empty. | |
1035 | */ | |
1036 | if (*fp) { | |
989a2979 ED |
1037 | rcu_read_lock(); |
1038 | kill_fasync_rcu(rcu_dereference(*fp), sig, band); | |
1039 | rcu_read_unlock(); | |
1da177e4 LT |
1040 | } |
1041 | } | |
1042 | EXPORT_SYMBOL(kill_fasync); | |
1043 | ||
454eedb8 | 1044 | static int __init fcntl_init(void) |
1da177e4 | 1045 | { |
3ab04d5c JB |
1046 | /* |
1047 | * Please add new bits here to ensure allocation uniqueness. | |
1048 | * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY | |
1049 | * is defined as O_NONBLOCK on some platforms and not on others. | |
1050 | */ | |
80f18379 CH |
1051 | BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != |
1052 | HWEIGHT32( | |
1053 | (VALID_OPEN_FLAGS & ~(O_NONBLOCK | O_NDELAY)) | | |
1054 | __FMODE_EXEC | __FMODE_NONOTIFY)); | |
454eedb8 | 1055 | |
1da177e4 | 1056 | fasync_cache = kmem_cache_create("fasync_cache", |
839d6820 VA |
1057 | sizeof(struct fasync_struct), 0, |
1058 | SLAB_PANIC | SLAB_ACCOUNT, NULL); | |
1da177e4 LT |
1059 | return 0; |
1060 | } | |
1061 | ||
454eedb8 | 1062 | module_init(fcntl_init) |