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1 /*
2 * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
29 /*
30 * Copyright (c) 1982, 1986, 1989, 1991, 1993
31 * The Regents of the University of California. All rights reserved.
32 * (c) UNIX System Laboratories, Inc.
33 * All or some portions of this file are derived from material licensed
34 * to the University of California by American Telephone and Telegraph
35 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
36 * the permission of UNIX System Laboratories, Inc.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * @(#)kern_descrip.c 8.8 (Berkeley) 2/14/95
67 */
68 /*
69 * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
70 * support for mandatory and extensible security protections. This notice
71 * is included in support of clause 2.2 (b) of the Apple Public License,
72 * Version 2.0.
73 */
74
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/filedesc.h>
78 #include <sys/kernel.h>
79 #include <sys/vnode_internal.h>
80 #include <sys/proc_internal.h>
81 #include <sys/kauth.h>
82 #include <sys/file_internal.h>
83 #include <sys/guarded.h>
84 #include <sys/socket.h>
85 #include <sys/socketvar.h>
86 #include <sys/stat.h>
87 #include <sys/ioctl.h>
88 #include <sys/fcntl.h>
89 #include <sys/malloc.h>
90 #include <sys/mman.h>
91 #include <sys/syslog.h>
92 #include <sys/unistd.h>
93 #include <sys/resourcevar.h>
94 #include <sys/aio_kern.h>
95 #include <sys/ev.h>
96 #include <kern/locks.h>
97 #include <sys/uio_internal.h>
98 #include <sys/codesign.h>
99 #include <sys/codedir_internal.h>
100
101 #include <security/audit/audit.h>
102
103 #include <sys/mount_internal.h>
104 #include <sys/kdebug.h>
105 #include <sys/sysproto.h>
106 #include <sys/pipe.h>
107 #include <sys/spawn.h>
108 #include <kern/kern_types.h>
109 #include <kern/kalloc.h>
110 #include <libkern/OSAtomic.h>
111
112 #include <sys/ubc_internal.h>
113
114 #include <kern/ipc_misc.h>
115 #include <vm/vm_protos.h>
116
117 #include <mach/mach_port.h>
118 #include <stdbool.h>
119
120 #if CONFIG_PROTECT
121 #include <sys/cprotect.h>
122 #endif
123 #include <hfs/hfs.h>
124
125 kern_return_t ipc_object_copyin(ipc_space_t, mach_port_name_t,
126 mach_msg_type_name_t, ipc_port_t *);
127 void ipc_port_release_send(ipc_port_t);
128
129 struct psemnode;
130 struct pshmnode;
131
132 static int finishdup(proc_t p,
133 struct filedesc *fdp, int old, int new, int flags, int32_t *retval);
134
135 int falloc_locked(proc_t p, struct fileproc **resultfp, int *resultfd, vfs_context_t ctx, int locked);
136 void fg_drop(struct fileproc * fp);
137 void fg_free(struct fileglob *fg);
138 void fg_ref(struct fileproc * fp);
139 void fileport_releasefg(struct fileglob *fg);
140
141 /* flags for close_internal_locked */
142 #define FD_DUP2RESV 1
143
144 /* We don't want these exported */
145
146 __private_extern__
147 int unlink1(vfs_context_t, struct nameidata *, int);
148
149 static void _fdrelse(struct proc * p, int fd);
150
151
152 extern void file_lock_init(void);
153
154 extern kauth_scope_t kauth_scope_fileop;
155
156 /* Conflict wait queue for when selects collide (opaque type) */
157 extern struct wait_queue select_conflict_queue;
158
159 #define f_flag f_fglob->fg_flag
160 #define f_type f_fglob->fg_ops->fo_type
161 #define f_msgcount f_fglob->fg_msgcount
162 #define f_cred f_fglob->fg_cred
163 #define f_ops f_fglob->fg_ops
164 #define f_offset f_fglob->fg_offset
165 #define f_data f_fglob->fg_data
166 #define CHECK_ADD_OVERFLOW_INT64L(x, y) \
167 (((((x) > 0) && ((y) > 0) && ((x) > LLONG_MAX - (y))) || \
168 (((x) < 0) && ((y) < 0) && ((x) < LLONG_MIN - (y)))) \
169 ? 1 : 0)
170 /*
171 * Descriptor management.
172 */
173 struct fmsglist fmsghead; /* head of list of open files */
174 struct fmsglist fmsg_ithead; /* head of list of open files */
175 int nfiles; /* actual number of open files */
176
177
178 lck_grp_attr_t * file_lck_grp_attr;
179 lck_grp_t * file_lck_grp;
180 lck_attr_t * file_lck_attr;
181
182 lck_mtx_t * uipc_lock;
183
184
185 /*
186 * check_file_seek_range
187 *
188 * Description: Checks if seek offsets are in the range of 0 to LLONG_MAX.
189 *
190 * Parameters: fl Flock structure.
191 * cur_file_offset Current offset in the file.
192 *
193 * Returns: 0 on Success.
194 * EOVERFLOW on overflow.
195 * EINVAL on offset less than zero.
196 */
197
198 static int
199 check_file_seek_range(struct flock *fl, off_t cur_file_offset)
200 {
201 if (fl->l_whence == SEEK_CUR) {
202 /* Check if the start marker is beyond LLONG_MAX. */
203 if (CHECK_ADD_OVERFLOW_INT64L(fl->l_start, cur_file_offset)) {
204 /* Check if start marker is negative */
205 if (fl->l_start < 0) {
206 return EINVAL;
207 }
208 return EOVERFLOW;
209 }
210 /* Check if the start marker is negative. */
211 if (fl->l_start + cur_file_offset < 0) {
212 return EINVAL;
213 }
214 /* Check if end marker is beyond LLONG_MAX. */
215 if ((fl->l_len > 0) && (CHECK_ADD_OVERFLOW_INT64L(fl->l_start +
216 cur_file_offset, fl->l_len - 1))) {
217 return EOVERFLOW;
218 }
219 /* Check if the end marker is negative. */
220 if ((fl->l_len <= 0) && (fl->l_start + cur_file_offset +
221 fl->l_len < 0)) {
222 return EINVAL;
223 }
224 } else if (fl->l_whence == SEEK_SET) {
225 /* Check if the start marker is negative. */
226 if (fl->l_start < 0) {
227 return EINVAL;
228 }
229 /* Check if the end marker is beyond LLONG_MAX. */
230 if ((fl->l_len > 0) &&
231 CHECK_ADD_OVERFLOW_INT64L(fl->l_start, fl->l_len - 1)) {
232 return EOVERFLOW;
233 }
234 /* Check if the end marker is negative. */
235 if ((fl->l_len < 0) && fl->l_start + fl->l_len < 0) {
236 return EINVAL;
237 }
238 }
239 return 0;
240 }
241
242
243 /*
244 * file_lock_init
245 *
246 * Description: Initialize the file lock group and the uipc and flist locks
247 *
248 * Parameters: (void)
249 *
250 * Returns: void
251 *
252 * Notes: Called at system startup from bsd_init().
253 */
254 void
255 file_lock_init(void)
256 {
257 /* allocate file lock group attribute and group */
258 file_lck_grp_attr= lck_grp_attr_alloc_init();
259
260 file_lck_grp = lck_grp_alloc_init("file", file_lck_grp_attr);
261
262 /* Allocate file lock attribute */
263 file_lck_attr = lck_attr_alloc_init();
264
265 uipc_lock = lck_mtx_alloc_init(file_lck_grp, file_lck_attr);
266 }
267
268
269 /*
270 * proc_fdlock, proc_fdlock_spin
271 *
272 * Description: Lock to control access to the per process struct fileproc
273 * and struct filedesc
274 *
275 * Parameters: p Process to take the lock on
276 *
277 * Returns: void
278 *
279 * Notes: The lock is initialized in forkproc() and destroyed in
280 * reap_child_process().
281 */
282 void
283 proc_fdlock(proc_t p)
284 {
285 lck_mtx_lock(&p->p_fdmlock);
286 }
287
288 void
289 proc_fdlock_spin(proc_t p)
290 {
291 lck_mtx_lock_spin(&p->p_fdmlock);
292 }
293
294 void
295 proc_fdlock_assert(proc_t p, int assertflags)
296 {
297 lck_mtx_assert(&p->p_fdmlock, assertflags);
298 }
299
300
301 /*
302 * proc_fdunlock
303 *
304 * Description: Unlock the lock previously locked by a call to proc_fdlock()
305 *
306 * Parameters: p Process to drop the lock on
307 *
308 * Returns: void
309 */
310 void
311 proc_fdunlock(proc_t p)
312 {
313 lck_mtx_unlock(&p->p_fdmlock);
314 }
315
316
317 /*
318 * System calls on descriptors.
319 */
320
321
322 /*
323 * getdtablesize
324 *
325 * Description: Returns the per process maximum size of the descriptor table
326 *
327 * Parameters: p Process being queried
328 * retval Pointer to the call return area
329 *
330 * Returns: 0 Success
331 *
332 * Implicit returns:
333 * *retval (modified) Size of dtable
334 */
335 int
336 getdtablesize(proc_t p, __unused struct getdtablesize_args *uap, int32_t *retval)
337 {
338 proc_fdlock_spin(p);
339 *retval = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
340 proc_fdunlock(p);
341
342 return (0);
343 }
344
345
346 void
347 procfdtbl_reservefd(struct proc * p, int fd)
348 {
349 p->p_fd->fd_ofiles[fd] = NULL;
350 p->p_fd->fd_ofileflags[fd] |= UF_RESERVED;
351 }
352
353 void
354 procfdtbl_markclosefd(struct proc * p, int fd)
355 {
356 p->p_fd->fd_ofileflags[fd] |= (UF_RESERVED | UF_CLOSING);
357 }
358
359 void
360 procfdtbl_releasefd(struct proc * p, int fd, struct fileproc * fp)
361 {
362 if (fp != NULL)
363 p->p_fd->fd_ofiles[fd] = fp;
364 p->p_fd->fd_ofileflags[fd] &= ~UF_RESERVED;
365 if ((p->p_fd->fd_ofileflags[fd] & UF_RESVWAIT) == UF_RESVWAIT) {
366 p->p_fd->fd_ofileflags[fd] &= ~UF_RESVWAIT;
367 wakeup(&p->p_fd);
368 }
369 }
370
371 void
372 procfdtbl_waitfd(struct proc * p, int fd)
373 {
374 p->p_fd->fd_ofileflags[fd] |= UF_RESVWAIT;
375 msleep(&p->p_fd, &p->p_fdmlock, PRIBIO, "ftbl_waitfd", NULL);
376 }
377
378
379 void
380 procfdtbl_clearfd(struct proc * p, int fd)
381 {
382 int waiting;
383
384 waiting = (p->p_fd->fd_ofileflags[fd] & UF_RESVWAIT);
385 p->p_fd->fd_ofiles[fd] = NULL;
386 p->p_fd->fd_ofileflags[fd] = 0;
387 if ( waiting == UF_RESVWAIT) {
388 wakeup(&p->p_fd);
389 }
390 }
391
392 /*
393 * _fdrelse
394 *
395 * Description: Inline utility function to free an fd in a filedesc
396 *
397 * Parameters: fdp Pointer to filedesc fd lies in
398 * fd fd to free
399 * reserv fd should be reserved
400 *
401 * Returns: void
402 *
403 * Locks: Assumes proc_fdlock for process pointing to fdp is held by
404 * the caller
405 */
406 static void
407 _fdrelse(struct proc * p, int fd)
408 {
409 struct filedesc *fdp = p->p_fd;
410 int nfd = 0;
411
412 if (fd < fdp->fd_freefile)
413 fdp->fd_freefile = fd;
414 #if DIAGNOSTIC
415 if (fd > fdp->fd_lastfile)
416 panic("fdrelse: fd_lastfile inconsistent");
417 #endif
418 procfdtbl_clearfd(p, fd);
419
420 while ((nfd = fdp->fd_lastfile) > 0 &&
421 fdp->fd_ofiles[nfd] == NULL &&
422 !(fdp->fd_ofileflags[nfd] & UF_RESERVED))
423 fdp->fd_lastfile--;
424 }
425
426
427 int
428 fd_rdwr(
429 int fd,
430 enum uio_rw rw,
431 uint64_t base,
432 int64_t len,
433 enum uio_seg segflg,
434 off_t offset,
435 int io_flg,
436 int64_t *aresid)
437 {
438 struct fileproc *fp;
439 proc_t p;
440 int error = 0;
441 int flags = 0;
442 int spacetype;
443 uio_t auio = NULL;
444 char uio_buf[ UIO_SIZEOF(1) ];
445 struct vfs_context context = *(vfs_context_current());
446 bool wrote_some = false;
447
448 p = current_proc();
449
450 error = fp_lookup(p, fd, &fp, 0);
451 if (error)
452 return(error);
453
454 if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_PIPE && fp->f_type != DTYPE_SOCKET) {
455 error = EINVAL;
456 goto out;
457 }
458 if (rw == UIO_WRITE && !(fp->f_flag & FWRITE)) {
459 error = EBADF;
460 goto out;
461 }
462
463 if (rw == UIO_READ && !(fp->f_flag & FREAD)) {
464 error = EBADF;
465 goto out;
466 }
467
468 context.vc_ucred = fp->f_fglob->fg_cred;
469
470 if (UIO_SEG_IS_USER_SPACE(segflg))
471 spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
472 else
473 spacetype = UIO_SYSSPACE;
474
475 auio = uio_createwithbuffer(1, offset, spacetype, rw, &uio_buf[0], sizeof(uio_buf));
476
477 uio_addiov(auio, base, len);
478
479 if ( !(io_flg & IO_APPEND))
480 flags = FOF_OFFSET;
481
482 if (rw == UIO_WRITE) {
483 user_ssize_t orig_resid = uio_resid(auio);
484 error = fo_write(fp, auio, flags, &context);
485 wrote_some = uio_resid(auio) < orig_resid;
486 } else
487 error = fo_read(fp, auio, flags, &context);
488
489 if (aresid)
490 *aresid = uio_resid(auio);
491 else {
492 if (uio_resid(auio) && error == 0)
493 error = EIO;
494 }
495 out:
496 if (wrote_some)
497 fp_drop_written(p, fd, fp);
498 else
499 fp_drop(p, fd, fp, 0);
500
501 return error;
502 }
503
504
505
506 /*
507 * dup
508 *
509 * Description: Duplicate a file descriptor.
510 *
511 * Parameters: p Process performing the dup
512 * uap->fd The fd to dup
513 * retval Pointer to the call return area
514 *
515 * Returns: 0 Success
516 * !0 Errno
517 *
518 * Implicit returns:
519 * *retval (modified) The new descriptor
520 */
521 int
522 dup(proc_t p, struct dup_args *uap, int32_t *retval)
523 {
524 struct filedesc *fdp = p->p_fd;
525 int old = uap->fd;
526 int new, error;
527 struct fileproc *fp;
528
529 proc_fdlock(p);
530 if ( (error = fp_lookup(p, old, &fp, 1)) ) {
531 proc_fdunlock(p);
532 return(error);
533 }
534 if (FP_ISGUARDED(fp, GUARD_DUP)) {
535 error = fp_guard_exception(p, old, fp, kGUARD_EXC_DUP);
536 (void) fp_drop(p, old, fp, 1);
537 proc_fdunlock(p);
538 return (error);
539 }
540 if ( (error = fdalloc(p, 0, &new)) ) {
541 fp_drop(p, old, fp, 1);
542 proc_fdunlock(p);
543 return (error);
544 }
545 error = finishdup(p, fdp, old, new, 0, retval);
546 fp_drop(p, old, fp, 1);
547 proc_fdunlock(p);
548
549 return (error);
550 }
551
552 /*
553 * dup2
554 *
555 * Description: Duplicate a file descriptor to a particular value.
556 *
557 * Parameters: p Process performing the dup
558 * uap->from The fd to dup
559 * uap->to The fd to dup it to
560 * retval Pointer to the call return area
561 *
562 * Returns: 0 Success
563 * !0 Errno
564 *
565 * Implicit returns:
566 * *retval (modified) The new descriptor
567 */
568 int
569 dup2(proc_t p, struct dup2_args *uap, int32_t *retval)
570 {
571 struct filedesc *fdp = p->p_fd;
572 int old = uap->from, new = uap->to;
573 int i, error;
574 struct fileproc *fp, *nfp;
575
576 proc_fdlock(p);
577
578 startover:
579 if ( (error = fp_lookup(p, old, &fp, 1)) ) {
580 proc_fdunlock(p);
581 return(error);
582 }
583 if (FP_ISGUARDED(fp, GUARD_DUP)) {
584 error = fp_guard_exception(p, old, fp, kGUARD_EXC_DUP);
585 (void) fp_drop(p, old, fp, 1);
586 proc_fdunlock(p);
587 return (error);
588 }
589 if (new < 0 ||
590 (rlim_t)new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
591 new >= maxfiles) {
592 fp_drop(p, old, fp, 1);
593 proc_fdunlock(p);
594 return (EBADF);
595 }
596 if (old == new) {
597 fp_drop(p, old, fp, 1);
598 *retval = new;
599 proc_fdunlock(p);
600 return (0);
601 }
602 if (new < 0 || new >= fdp->fd_nfiles) {
603 if ( (error = fdalloc(p, new, &i)) ) {
604 fp_drop(p, old, fp, 1);
605 proc_fdunlock(p);
606 return (error);
607 }
608 if (new != i) {
609 fdrelse(p, i);
610 goto closeit;
611 }
612 } else {
613 closeit:
614 while ((fdp->fd_ofileflags[new] & UF_RESERVED) == UF_RESERVED) {
615 fp_drop(p, old, fp, 1);
616 procfdtbl_waitfd(p, new);
617 #if DIAGNOSTIC
618 proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
619 #endif
620 goto startover;
621 }
622
623 if ((fdp->fd_ofiles[new] != NULL) &&
624 ((error = fp_lookup(p, new, &nfp, 1)) == 0)) {
625 fp_drop(p, old, fp, 1);
626 if (FP_ISGUARDED(nfp, GUARD_CLOSE)) {
627 error = fp_guard_exception(p,
628 new, nfp, kGUARD_EXC_CLOSE);
629 (void) fp_drop(p, new, nfp, 1);
630 proc_fdunlock(p);
631 return (error);
632 }
633 (void)close_internal_locked(p, new, nfp, FD_DUP2RESV);
634 #if DIAGNOSTIC
635 proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
636 #endif
637 procfdtbl_clearfd(p, new);
638 goto startover;
639 } else {
640 #if DIAGNOSTIC
641 if (fdp->fd_ofiles[new] != NULL)
642 panic("dup2: no ref on fileproc %d", new);
643 #endif
644 procfdtbl_reservefd(p, new);
645 }
646
647 #if DIAGNOSTIC
648 proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
649 #endif
650
651 }
652 #if DIAGNOSTIC
653 if (fdp->fd_ofiles[new] != 0)
654 panic("dup2: overwriting fd_ofiles with new %d", new);
655 if ((fdp->fd_ofileflags[new] & UF_RESERVED) == 0)
656 panic("dup2: unreserved fileflags with new %d", new);
657 #endif
658 error = finishdup(p, fdp, old, new, 0, retval);
659 fp_drop(p, old, fp, 1);
660 proc_fdunlock(p);
661
662 return(error);
663 }
664
665
666 /*
667 * fcntl
668 *
669 * Description: The file control system call.
670 *
671 * Parameters: p Process performing the fcntl
672 * uap->fd The fd to operate against
673 * uap->cmd The command to perform
674 * uap->arg Pointer to the command argument
675 * retval Pointer to the call return area
676 *
677 * Returns: 0 Success
678 * !0 Errno (see fcntl_nocancel)
679 *
680 * Implicit returns:
681 * *retval (modified) fcntl return value (if any)
682 *
683 * Notes: This system call differs from fcntl_nocancel() in that it
684 * tests for cancellation prior to performing a potentially
685 * blocking operation.
686 */
687 int
688 fcntl(proc_t p, struct fcntl_args *uap, int32_t *retval)
689 {
690 __pthread_testcancel(1);
691 return(fcntl_nocancel(p, (struct fcntl_nocancel_args *)uap, retval));
692 }
693
694
695 /*
696 * fcntl_nocancel
697 *
698 * Description: A non-cancel-testing file control system call.
699 *
700 * Parameters: p Process performing the fcntl
701 * uap->fd The fd to operate against
702 * uap->cmd The command to perform
703 * uap->arg Pointer to the command argument
704 * retval Pointer to the call return area
705 *
706 * Returns: 0 Success
707 * EINVAL
708 * fp_lookup:EBADF Bad file descriptor
709 * [F_DUPFD]
710 * fdalloc:EMFILE
711 * fdalloc:ENOMEM
712 * finishdup:EBADF
713 * finishdup:ENOMEM
714 * [F_SETOWN]
715 * ESRCH
716 * [F_SETLK]
717 * EBADF
718 * EOVERFLOW
719 * copyin:EFAULT
720 * vnode_getwithref:???
721 * VNOP_ADVLOCK:???
722 * msleep:ETIMEDOUT
723 * [F_GETLK]
724 * EBADF
725 * EOVERFLOW
726 * copyin:EFAULT
727 * copyout:EFAULT
728 * vnode_getwithref:???
729 * VNOP_ADVLOCK:???
730 * [F_PREALLOCATE]
731 * EBADF
732 * EINVAL
733 * copyin:EFAULT
734 * copyout:EFAULT
735 * vnode_getwithref:???
736 * VNOP_ALLOCATE:???
737 * [F_SETSIZE,F_RDADVISE]
738 * EBADF
739 * copyin:EFAULT
740 * vnode_getwithref:???
741 * [F_RDAHEAD,F_NOCACHE]
742 * EBADF
743 * vnode_getwithref:???
744 * [???]
745 *
746 * Implicit returns:
747 * *retval (modified) fcntl return value (if any)
748 */
749 int
750 fcntl_nocancel(proc_t p, struct fcntl_nocancel_args *uap, int32_t *retval)
751 {
752 int fd = uap->fd;
753 struct filedesc *fdp = p->p_fd;
754 struct fileproc *fp;
755 char *pop;
756 struct vnode *vp = NULLVP; /* for AUDIT_ARG() at end */
757 int i, tmp, error, error2, flg = F_POSIX;
758 struct flock fl;
759 struct flocktimeout fltimeout;
760 struct timespec *timeout = NULL;
761 struct vfs_context context;
762 off_t offset;
763 int newmin;
764 daddr64_t lbn, bn;
765 unsigned int fflag;
766 user_addr_t argp;
767 boolean_t is64bit;
768
769 AUDIT_ARG(fd, uap->fd);
770 AUDIT_ARG(cmd, uap->cmd);
771
772 proc_fdlock(p);
773 if ( (error = fp_lookup(p, fd, &fp, 1)) ) {
774 proc_fdunlock(p);
775 return(error);
776 }
777 context.vc_thread = current_thread();
778 context.vc_ucred = fp->f_cred;
779
780 is64bit = proc_is64bit(p);
781 if (is64bit) {
782 argp = uap->arg;
783 }
784 else {
785 /*
786 * Since the arg parameter is defined as a long but may be
787 * either a long or a pointer we must take care to handle
788 * sign extension issues. Our sys call munger will sign
789 * extend a long when we are called from a 32-bit process.
790 * Since we can never have an address greater than 32-bits
791 * from a 32-bit process we lop off the top 32-bits to avoid
792 * getting the wrong address
793 */
794 argp = CAST_USER_ADDR_T((uint32_t)uap->arg);
795 }
796
797 pop = &fdp->fd_ofileflags[fd];
798
799 #if CONFIG_MACF
800 error = mac_file_check_fcntl(proc_ucred(p), fp->f_fglob, uap->cmd,
801 uap->arg);
802 if (error)
803 goto out;
804 #endif
805
806 switch (uap->cmd) {
807
808 case F_DUPFD:
809 case F_DUPFD_CLOEXEC:
810 if (FP_ISGUARDED(fp, GUARD_DUP)) {
811 error = fp_guard_exception(p, fd, fp, kGUARD_EXC_DUP);
812 goto out;
813 }
814 newmin = CAST_DOWN_EXPLICIT(int, uap->arg); /* arg is an int, so we won't lose bits */
815 AUDIT_ARG(value32, newmin);
816 if ((u_int)newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
817 newmin >= maxfiles) {
818 error = EINVAL;
819 goto out;
820 }
821 if ( (error = fdalloc(p, newmin, &i)) )
822 goto out;
823 error = finishdup(p, fdp, fd, i,
824 uap->cmd == F_DUPFD_CLOEXEC ? UF_EXCLOSE : 0, retval);
825 goto out;
826
827 case F_GETFD:
828 *retval = (*pop & UF_EXCLOSE)? FD_CLOEXEC : 0;
829 error = 0;
830 goto out;
831
832 case F_SETFD:
833 AUDIT_ARG(value32, uap->arg);
834 if (uap->arg & FD_CLOEXEC)
835 *pop |= UF_EXCLOSE;
836 else {
837 if (FILEPROC_TYPE(fp) == FTYPE_GUARDED) {
838 error = fp_guard_exception(p,
839 fd, fp, kGUARD_EXC_NOCLOEXEC);
840 goto out;
841 }
842 *pop &= ~UF_EXCLOSE;
843 }
844 error = 0;
845 goto out;
846
847 case F_GETFL:
848 *retval = OFLAGS(fp->f_flag);
849 error = 0;
850 goto out;
851
852 case F_SETFL:
853 fp->f_flag &= ~FCNTLFLAGS;
854 tmp = CAST_DOWN_EXPLICIT(int, uap->arg); /* arg is an int, so we won't lose bits */
855 AUDIT_ARG(value32, tmp);
856 fp->f_flag |= FFLAGS(tmp) & FCNTLFLAGS;
857 tmp = fp->f_flag & FNONBLOCK;
858 error = fo_ioctl(fp, FIONBIO, (caddr_t)&tmp, &context);
859 if (error)
860 goto out;
861 tmp = fp->f_flag & FASYNC;
862 error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, &context);
863 if (!error)
864 goto out;
865 fp->f_flag &= ~FNONBLOCK;
866 tmp = 0;
867 (void)fo_ioctl(fp, FIONBIO, (caddr_t)&tmp, &context);
868 goto out;
869
870 case F_GETOWN:
871 if (fp->f_type == DTYPE_SOCKET) {
872 *retval = ((struct socket *)fp->f_data)->so_pgid;
873 error = 0;
874 goto out;
875 }
876 error = fo_ioctl(fp, (int)TIOCGPGRP, (caddr_t)retval, &context);
877 *retval = -*retval;
878 goto out;
879
880 case F_SETOWN:
881 tmp = CAST_DOWN_EXPLICIT(pid_t, uap->arg); /* arg is an int, so we won't lose bits */
882 AUDIT_ARG(value32, tmp);
883 if (fp->f_type == DTYPE_SOCKET) {
884 ((struct socket *)fp->f_data)->so_pgid = tmp;
885 error =0;
886 goto out;
887 }
888 if (fp->f_type == DTYPE_PIPE) {
889 error = fo_ioctl(fp, TIOCSPGRP, (caddr_t)&tmp, &context);
890 goto out;
891 }
892
893 if (tmp <= 0) {
894 tmp = -tmp;
895 } else {
896 proc_t p1 = proc_find(tmp);
897 if (p1 == 0) {
898 error = ESRCH;
899 goto out;
900 }
901 tmp = (int)p1->p_pgrpid;
902 proc_rele(p1);
903 }
904 error = fo_ioctl(fp, (int)TIOCSPGRP, (caddr_t)&tmp, &context);
905 goto out;
906
907 case F_SETNOSIGPIPE:
908 tmp = CAST_DOWN_EXPLICIT(int, uap->arg);
909 if (fp->f_type == DTYPE_SOCKET) {
910 #if SOCKETS
911 error = sock_setsockopt((struct socket *)fp->f_data,
912 SOL_SOCKET, SO_NOSIGPIPE, &tmp, sizeof (tmp));
913 #else
914 error = EINVAL;
915 #endif
916 } else {
917 struct fileglob *fg = fp->f_fglob;
918
919 lck_mtx_lock_spin(&fg->fg_lock);
920 if (tmp)
921 fg->fg_lflags |= FG_NOSIGPIPE;
922 else
923 fg->fg_lflags &= FG_NOSIGPIPE;
924 lck_mtx_unlock(&fg->fg_lock);
925 error = 0;
926 }
927 goto out;
928
929 case F_GETNOSIGPIPE:
930 if (fp->f_type == DTYPE_SOCKET) {
931 #if SOCKETS
932 int retsize = sizeof (*retval);
933 error = sock_getsockopt((struct socket *)fp->f_data,
934 SOL_SOCKET, SO_NOSIGPIPE, retval, &retsize);
935 #else
936 error = EINVAL;
937 #endif
938 } else {
939 *retval = (fp->f_fglob->fg_lflags & FG_NOSIGPIPE) ?
940 1 : 0;
941 error = 0;
942 }
943 goto out;
944
945 case F_SETLKWTIMEOUT:
946 case F_SETLKW:
947 flg |= F_WAIT;
948 /* Fall into F_SETLK */
949
950 case F_SETLK:
951 if (fp->f_type != DTYPE_VNODE) {
952 error = EBADF;
953 goto out;
954 }
955 vp = (struct vnode *)fp->f_data;
956
957 fflag = fp->f_flag;
958 offset = fp->f_offset;
959 proc_fdunlock(p);
960
961 /* Copy in the lock structure */
962 if (uap->cmd == F_SETLKWTIMEOUT) {
963 error = copyin(argp, (caddr_t) &fltimeout, sizeof(fltimeout));
964 if (error) {
965 goto outdrop;
966 }
967 fl = fltimeout.fl;
968 timeout = &fltimeout.timeout;
969 } else {
970 error = copyin(argp, (caddr_t)&fl, sizeof(fl));
971 if (error) {
972 goto outdrop;
973 }
974 }
975
976 /* Check starting byte and ending byte for EOVERFLOW in SEEK_CUR */
977 /* and ending byte for EOVERFLOW in SEEK_SET */
978 error = check_file_seek_range(&fl, offset);
979 if (error) {
980 goto outdrop;
981 }
982
983 if ( (error = vnode_getwithref(vp)) ) {
984 goto outdrop;
985 }
986 if (fl.l_whence == SEEK_CUR)
987 fl.l_start += offset;
988
989 #if CONFIG_MACF
990 error = mac_file_check_lock(proc_ucred(p), fp->f_fglob,
991 F_SETLK, &fl);
992 if (error) {
993 (void)vnode_put(vp);
994 goto outdrop;
995 }
996 #endif
997 switch (fl.l_type) {
998
999 case F_RDLCK:
1000 if ((fflag & FREAD) == 0) {
1001 (void)vnode_put(vp);
1002 error = EBADF;
1003 goto outdrop;
1004 }
1005 // XXX UInt32 unsafe for LP64 kernel
1006 OSBitOrAtomic(P_LADVLOCK, &p->p_ladvflag);
1007 error = VNOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg, &context, timeout);
1008 (void)vnode_put(vp);
1009 goto outdrop;
1010
1011 case F_WRLCK:
1012 if ((fflag & FWRITE) == 0) {
1013 (void)vnode_put(vp);
1014 error = EBADF;
1015 goto outdrop;
1016 }
1017 // XXX UInt32 unsafe for LP64 kernel
1018 OSBitOrAtomic(P_LADVLOCK, &p->p_ladvflag);
1019 error = VNOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg, &context, timeout);
1020 (void)vnode_put(vp);
1021 goto outdrop;
1022
1023 case F_UNLCK:
1024 error = VNOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl,
1025 F_POSIX, &context, timeout);
1026 (void)vnode_put(vp);
1027 goto outdrop;
1028
1029 default:
1030 (void)vnode_put(vp);
1031 error = EINVAL;
1032 goto outdrop;
1033 }
1034
1035 case F_GETLK:
1036 if (fp->f_type != DTYPE_VNODE) {
1037 error = EBADF;
1038 goto out;
1039 }
1040 vp = (struct vnode *)fp->f_data;
1041
1042 offset = fp->f_offset;
1043 proc_fdunlock(p);
1044
1045 /* Copy in the lock structure */
1046 error = copyin(argp, (caddr_t)&fl, sizeof(fl));
1047 if (error)
1048 goto outdrop;
1049
1050 /* Check starting byte and ending byte for EOVERFLOW in SEEK_CUR */
1051 /* and ending byte for EOVERFLOW in SEEK_SET */
1052 error = check_file_seek_range(&fl, offset);
1053 if (error) {
1054 goto outdrop;
1055 }
1056
1057 if ((fl.l_whence == SEEK_SET) && (fl.l_start < 0)) {
1058 error = EINVAL;
1059 goto outdrop;
1060 }
1061
1062 switch (fl.l_type) {
1063 case F_RDLCK:
1064 case F_UNLCK:
1065 case F_WRLCK:
1066 break;
1067 default:
1068 error = EINVAL;
1069 goto outdrop;
1070 }
1071
1072 switch (fl.l_whence) {
1073 case SEEK_CUR:
1074 case SEEK_SET:
1075 case SEEK_END:
1076 break;
1077 default:
1078 error = EINVAL;
1079 goto outdrop;
1080 }
1081
1082 if ( (error = vnode_getwithref(vp)) == 0 ) {
1083 if (fl.l_whence == SEEK_CUR)
1084 fl.l_start += offset;
1085
1086 #if CONFIG_MACF
1087 error = mac_file_check_lock(proc_ucred(p), fp->f_fglob,
1088 uap->cmd, &fl);
1089 if (error == 0)
1090 #endif
1091 error = VNOP_ADVLOCK(vp, (caddr_t)p, uap->cmd, &fl, F_POSIX, &context, NULL);
1092
1093 (void)vnode_put(vp);
1094
1095 if (error == 0)
1096 error = copyout((caddr_t)&fl, argp, sizeof(fl));
1097 }
1098 goto outdrop;
1099
1100 case F_PREALLOCATE: {
1101 fstore_t alloc_struct; /* structure for allocate command */
1102 u_int32_t alloc_flags = 0;
1103
1104 if (fp->f_type != DTYPE_VNODE) {
1105 error = EBADF;
1106 goto out;
1107 }
1108
1109 vp = (struct vnode *)fp->f_data;
1110 proc_fdunlock(p);
1111
1112 /* make sure that we have write permission */
1113 if ((fp->f_flag & FWRITE) == 0) {
1114 error = EBADF;
1115 goto outdrop;
1116 }
1117
1118 error = copyin(argp, (caddr_t)&alloc_struct, sizeof(alloc_struct));
1119 if (error)
1120 goto outdrop;
1121
1122 /* now set the space allocated to 0 */
1123 alloc_struct.fst_bytesalloc = 0;
1124
1125 /*
1126 * Do some simple parameter checking
1127 */
1128
1129 /* set up the flags */
1130
1131 alloc_flags |= PREALLOCATE;
1132
1133 if (alloc_struct.fst_flags & F_ALLOCATECONTIG)
1134 alloc_flags |= ALLOCATECONTIG;
1135
1136 if (alloc_struct.fst_flags & F_ALLOCATEALL)
1137 alloc_flags |= ALLOCATEALL;
1138
1139 /*
1140 * Do any position mode specific stuff. The only
1141 * position mode supported now is PEOFPOSMODE
1142 */
1143
1144 switch (alloc_struct.fst_posmode) {
1145
1146 case F_PEOFPOSMODE:
1147 if (alloc_struct.fst_offset != 0) {
1148 error = EINVAL;
1149 goto outdrop;
1150 }
1151
1152 alloc_flags |= ALLOCATEFROMPEOF;
1153 break;
1154
1155 case F_VOLPOSMODE:
1156 if (alloc_struct.fst_offset <= 0) {
1157 error = EINVAL;
1158 goto outdrop;
1159 }
1160
1161 alloc_flags |= ALLOCATEFROMVOL;
1162 break;
1163
1164 default: {
1165 error = EINVAL;
1166 goto outdrop;
1167 }
1168 }
1169 if ( (error = vnode_getwithref(vp)) == 0 ) {
1170 /*
1171 * call allocate to get the space
1172 */
1173 error = VNOP_ALLOCATE(vp,alloc_struct.fst_length,alloc_flags,
1174 &alloc_struct.fst_bytesalloc, alloc_struct.fst_offset,
1175 &context);
1176 (void)vnode_put(vp);
1177
1178 error2 = copyout((caddr_t)&alloc_struct, argp, sizeof(alloc_struct));
1179
1180 if (error == 0)
1181 error = error2;
1182 }
1183 goto outdrop;
1184
1185 }
1186 case F_SETSIZE:
1187 if (fp->f_type != DTYPE_VNODE) {
1188 error = EBADF;
1189 goto out;
1190 }
1191 vp = (struct vnode *)fp->f_data;
1192 proc_fdunlock(p);
1193
1194 error = copyin(argp, (caddr_t)&offset, sizeof (off_t));
1195 if (error)
1196 goto outdrop;
1197 AUDIT_ARG(value64, offset);
1198
1199 error = vnode_getwithref(vp);
1200 if (error)
1201 goto outdrop;
1202
1203 #if CONFIG_MACF
1204 error = mac_vnode_check_truncate(&context,
1205 fp->f_fglob->fg_cred, vp);
1206 if (error) {
1207 (void)vnode_put(vp);
1208 goto outdrop;
1209 }
1210 #endif
1211 /*
1212 * Make sure that we are root. Growing a file
1213 * without zero filling the data is a security hole
1214 * root would have access anyway so we'll allow it
1215 */
1216 if (!kauth_cred_issuser(kauth_cred_get())) {
1217 error = EACCES;
1218 } else {
1219 /*
1220 * set the file size
1221 */
1222 error = vnode_setsize(vp, offset, IO_NOZEROFILL,
1223 &context);
1224 }
1225
1226 (void)vnode_put(vp);
1227 goto outdrop;
1228
1229 case F_RDAHEAD:
1230 if (fp->f_type != DTYPE_VNODE) {
1231 error = EBADF;
1232 goto out;
1233 }
1234 if (uap->arg)
1235 fp->f_fglob->fg_flag &= ~FNORDAHEAD;
1236 else
1237 fp->f_fglob->fg_flag |= FNORDAHEAD;
1238
1239 goto out;
1240
1241 case F_NOCACHE:
1242 if (fp->f_type != DTYPE_VNODE) {
1243 error = EBADF;
1244 goto out;
1245 }
1246 if (uap->arg)
1247 fp->f_fglob->fg_flag |= FNOCACHE;
1248 else
1249 fp->f_fglob->fg_flag &= ~FNOCACHE;
1250
1251 goto out;
1252
1253 case F_NODIRECT:
1254 if (fp->f_type != DTYPE_VNODE) {
1255 error = EBADF;
1256 goto out;
1257 }
1258 if (uap->arg)
1259 fp->f_fglob->fg_flag |= FNODIRECT;
1260 else
1261 fp->f_fglob->fg_flag &= ~FNODIRECT;
1262
1263 goto out;
1264
1265 case F_SINGLE_WRITER:
1266 if (fp->f_type != DTYPE_VNODE) {
1267 error = EBADF;
1268 goto out;
1269 }
1270 if (uap->arg)
1271 fp->f_fglob->fg_flag |= FSINGLE_WRITER;
1272 else
1273 fp->f_fglob->fg_flag &= ~FSINGLE_WRITER;
1274
1275 goto out;
1276
1277 case F_GLOBAL_NOCACHE:
1278 if (fp->f_type != DTYPE_VNODE) {
1279 error = EBADF;
1280 goto out;
1281 }
1282 vp = (struct vnode *)fp->f_data;
1283 proc_fdunlock(p);
1284
1285 if ( (error = vnode_getwithref(vp)) == 0 ) {
1286
1287 *retval = vnode_isnocache(vp);
1288
1289 if (uap->arg)
1290 vnode_setnocache(vp);
1291 else
1292 vnode_clearnocache(vp);
1293
1294 (void)vnode_put(vp);
1295 }
1296 goto outdrop;
1297
1298 case F_CHECK_OPENEVT:
1299 if (fp->f_type != DTYPE_VNODE) {
1300 error = EBADF;
1301 goto out;
1302 }
1303 vp = (struct vnode *)fp->f_data;
1304 proc_fdunlock(p);
1305
1306 if ( (error = vnode_getwithref(vp)) == 0 ) {
1307
1308 *retval = vnode_is_openevt(vp);
1309
1310 if (uap->arg)
1311 vnode_set_openevt(vp);
1312 else
1313 vnode_clear_openevt(vp);
1314
1315 (void)vnode_put(vp);
1316 }
1317 goto outdrop;
1318
1319 case F_RDADVISE: {
1320 struct radvisory ra_struct;
1321
1322 if (fp->f_type != DTYPE_VNODE) {
1323 error = EBADF;
1324 goto out;
1325 }
1326 vp = (struct vnode *)fp->f_data;
1327 proc_fdunlock(p);
1328
1329 if ( (error = copyin(argp, (caddr_t)&ra_struct, sizeof(ra_struct))) )
1330 goto outdrop;
1331 if ( (error = vnode_getwithref(vp)) == 0 ) {
1332 error = VNOP_IOCTL(vp, F_RDADVISE, (caddr_t)&ra_struct, 0, &context);
1333
1334 (void)vnode_put(vp);
1335 }
1336 goto outdrop;
1337 }
1338
1339 case F_FLUSH_DATA:
1340
1341 if (fp->f_type != DTYPE_VNODE) {
1342 error = EBADF;
1343 goto out;
1344 }
1345 vp = (struct vnode *)fp->f_data;
1346 proc_fdunlock(p);
1347
1348 if ( (error = vnode_getwithref(vp)) == 0 ) {
1349 error = cluster_push(vp, 0);
1350
1351 (void)vnode_put(vp);
1352 }
1353 goto outdrop;
1354
1355 case F_LOG2PHYS:
1356 case F_LOG2PHYS_EXT: {
1357 struct log2phys l2p_struct; /* structure for allocate command */
1358 int devBlockSize;
1359
1360 off_t file_offset = 0;
1361 size_t a_size = 0;
1362 size_t run = 0;
1363
1364 if (uap->cmd == F_LOG2PHYS_EXT) {
1365 error = copyin(argp, (caddr_t)&l2p_struct, sizeof(l2p_struct));
1366 if (error)
1367 goto out;
1368 file_offset = l2p_struct.l2p_devoffset;
1369 } else {
1370 file_offset = fp->f_offset;
1371 }
1372 if (fp->f_type != DTYPE_VNODE) {
1373 error = EBADF;
1374 goto out;
1375 }
1376 vp = (struct vnode *)fp->f_data;
1377 proc_fdunlock(p);
1378 if ( (error = vnode_getwithref(vp)) ) {
1379 goto outdrop;
1380 }
1381 error = VNOP_OFFTOBLK(vp, file_offset, &lbn);
1382 if (error) {
1383 (void)vnode_put(vp);
1384 goto outdrop;
1385 }
1386 error = VNOP_BLKTOOFF(vp, lbn, &offset);
1387 if (error) {
1388 (void)vnode_put(vp);
1389 goto outdrop;
1390 }
1391 devBlockSize = vfs_devblocksize(vnode_mount(vp));
1392 if (uap->cmd == F_LOG2PHYS_EXT) {
1393 #if defined(__LP64__)
1394 a_size = l2p_struct.l2p_contigbytes;
1395 #else
1396 if ((l2p_struct.l2p_contigbytes > SIZE_MAX) || (l2p_struct.l2p_contigbytes < 0)) {
1397 /* size_t is 32-bit on a 32-bit kernel, therefore
1398 * assigning l2p_contigbytes to a_size may have
1399 * caused integer overflow. We, therefore, return
1400 * an error here instead of calculating incorrect
1401 * value.
1402 */
1403 printf ("fcntl: F_LOG2PHYS_EXT: l2p_contigbytes=%lld will overflow, returning error\n", l2p_struct.l2p_contigbytes);
1404 error = EFBIG;
1405 goto outdrop;
1406 } else {
1407 a_size = l2p_struct.l2p_contigbytes;
1408 }
1409 #endif
1410 } else {
1411 a_size = devBlockSize;
1412 }
1413
1414 error = VNOP_BLOCKMAP(vp, offset, a_size, &bn, &run, NULL, 0, &context);
1415
1416 (void)vnode_put(vp);
1417
1418 if (!error) {
1419 l2p_struct.l2p_flags = 0; /* for now */
1420 if (uap->cmd == F_LOG2PHYS_EXT) {
1421 l2p_struct.l2p_contigbytes = run - (file_offset - offset);
1422 } else {
1423 l2p_struct.l2p_contigbytes = 0; /* for now */
1424 }
1425
1426 /*
1427 * The block number being -1 suggests that the file offset is not backed
1428 * by any real blocks on-disk. As a result, just let it be passed back up wholesale.
1429 */
1430 if (bn == -1) {
1431 /* Don't multiply it by the block size */
1432 l2p_struct.l2p_devoffset = bn;
1433 }
1434 else {
1435 l2p_struct.l2p_devoffset = bn * devBlockSize;
1436 l2p_struct.l2p_devoffset += file_offset - offset;
1437 }
1438 error = copyout((caddr_t)&l2p_struct, argp, sizeof(l2p_struct));
1439 }
1440 goto outdrop;
1441 }
1442 case F_GETPATH: {
1443 char *pathbufp;
1444 int pathlen;
1445
1446 if (fp->f_type != DTYPE_VNODE) {
1447 error = EBADF;
1448 goto out;
1449 }
1450 vp = (struct vnode *)fp->f_data;
1451 proc_fdunlock(p);
1452
1453 pathlen = MAXPATHLEN;
1454 MALLOC(pathbufp, char *, pathlen, M_TEMP, M_WAITOK);
1455 if (pathbufp == NULL) {
1456 error = ENOMEM;
1457 goto outdrop;
1458 }
1459 if ( (error = vnode_getwithref(vp)) == 0 ) {
1460 error = vn_getpath(vp, pathbufp, &pathlen);
1461 (void)vnode_put(vp);
1462
1463 if (error == 0)
1464 error = copyout((caddr_t)pathbufp, argp, pathlen);
1465 }
1466 FREE(pathbufp, M_TEMP);
1467 goto outdrop;
1468 }
1469
1470 case F_PATHPKG_CHECK: {
1471 char *pathbufp;
1472 size_t pathlen;
1473
1474 if (fp->f_type != DTYPE_VNODE) {
1475 error = EBADF;
1476 goto out;
1477 }
1478 vp = (struct vnode *)fp->f_data;
1479 proc_fdunlock(p);
1480
1481 pathlen = MAXPATHLEN;
1482 pathbufp = kalloc(MAXPATHLEN);
1483
1484 if ( (error = copyinstr(argp, pathbufp, MAXPATHLEN, &pathlen)) == 0 ) {
1485 if ( (error = vnode_getwithref(vp)) == 0 ) {
1486 AUDIT_ARG(text, pathbufp);
1487 error = vn_path_package_check(vp, pathbufp, pathlen, retval);
1488
1489 (void)vnode_put(vp);
1490 }
1491 }
1492 kfree(pathbufp, MAXPATHLEN);
1493 goto outdrop;
1494 }
1495
1496 case F_CHKCLEAN: // used by regression tests to see if all dirty pages got cleaned by fsync()
1497 case F_FULLFSYNC: // fsync + flush the journal + DKIOCSYNCHRONIZECACHE
1498 case F_FREEZE_FS: // freeze all other fs operations for the fs of this fd
1499 case F_THAW_FS: { // thaw all frozen fs operations for the fs of this fd
1500 if (fp->f_type != DTYPE_VNODE) {
1501 error = EBADF;
1502 goto out;
1503 }
1504 vp = (struct vnode *)fp->f_data;
1505 proc_fdunlock(p);
1506
1507 if ( (error = vnode_getwithref(vp)) == 0 ) {
1508 error = VNOP_IOCTL(vp, uap->cmd, (caddr_t)NULL, 0, &context);
1509
1510 (void)vnode_put(vp);
1511 }
1512 break;
1513 }
1514
1515 /*
1516 * SPI (private) for opening a file starting from a dir fd
1517 */
1518 case F_OPENFROM: {
1519 struct user_fopenfrom fopen;
1520 struct vnode_attr va;
1521 struct nameidata nd;
1522 int cmode;
1523
1524 /* Check if this isn't a valid file descriptor */
1525 if ((fp->f_type != DTYPE_VNODE) ||
1526 (fp->f_flag & FREAD) == 0) {
1527 error = EBADF;
1528 goto out;
1529 }
1530 vp = (struct vnode *)fp->f_data;
1531 proc_fdunlock(p);
1532
1533 if (vnode_getwithref(vp)) {
1534 error = ENOENT;
1535 goto outdrop;
1536 }
1537
1538 /* Only valid for directories */
1539 if (vp->v_type != VDIR) {
1540 vnode_put(vp);
1541 error = ENOTDIR;
1542 goto outdrop;
1543 }
1544
1545 /* Get flags, mode and pathname arguments. */
1546 if (IS_64BIT_PROCESS(p)) {
1547 error = copyin(argp, &fopen, sizeof(fopen));
1548 } else {
1549 struct user32_fopenfrom fopen32;
1550
1551 error = copyin(argp, &fopen32, sizeof(fopen32));
1552 fopen.o_flags = fopen32.o_flags;
1553 fopen.o_mode = fopen32.o_mode;
1554 fopen.o_pathname = CAST_USER_ADDR_T(fopen32.o_pathname);
1555 }
1556 if (error) {
1557 vnode_put(vp);
1558 goto outdrop;
1559 }
1560 AUDIT_ARG(fflags, fopen.o_flags);
1561 AUDIT_ARG(mode, fopen.o_mode);
1562 VATTR_INIT(&va);
1563 /* Mask off all but regular access permissions */
1564 cmode = ((fopen.o_mode &~ fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
1565 VATTR_SET(&va, va_mode, cmode & ACCESSPERMS);
1566
1567 /* Start the lookup relative to the file descriptor's vnode. */
1568 NDINIT(&nd, LOOKUP, OP_OPEN, USEDVP | FOLLOW | AUDITVNPATH1, UIO_USERSPACE,
1569 fopen.o_pathname, &context);
1570 nd.ni_dvp = vp;
1571
1572 error = open1(&context, &nd, fopen.o_flags, &va,
1573 fileproc_alloc_init, NULL, retval);
1574
1575 vnode_put(vp);
1576 break;
1577 }
1578 /*
1579 * SPI (private) for unlinking a file starting from a dir fd
1580 */
1581 case F_UNLINKFROM: {
1582 struct nameidata nd;
1583 user_addr_t pathname;
1584
1585 /* Check if this isn't a valid file descriptor */
1586 if ((fp->f_type != DTYPE_VNODE) ||
1587 (fp->f_flag & FREAD) == 0) {
1588 error = EBADF;
1589 goto out;
1590 }
1591 vp = (struct vnode *)fp->f_data;
1592 proc_fdunlock(p);
1593
1594 if (vnode_getwithref(vp)) {
1595 error = ENOENT;
1596 goto outdrop;
1597 }
1598
1599 /* Only valid for directories */
1600 if (vp->v_type != VDIR) {
1601 vnode_put(vp);
1602 error = ENOTDIR;
1603 goto outdrop;
1604 }
1605
1606 /* Get flags, mode and pathname arguments. */
1607 if (IS_64BIT_PROCESS(p)) {
1608 pathname = (user_addr_t)argp;
1609 } else {
1610 pathname = CAST_USER_ADDR_T(argp);
1611 }
1612
1613 /* Start the lookup relative to the file descriptor's vnode. */
1614 NDINIT(&nd, DELETE, OP_UNLINK, USEDVP | AUDITVNPATH1, UIO_USERSPACE,
1615 pathname, &context);
1616 nd.ni_dvp = vp;
1617
1618 error = unlink1(&context, &nd, 0);
1619
1620 vnode_put(vp);
1621 break;
1622
1623 }
1624
1625 case F_ADDSIGS:
1626 case F_ADDFILESIGS:
1627 {
1628 struct user_fsignatures fs;
1629 kern_return_t kr;
1630 vm_offset_t kernel_blob_addr;
1631 vm_size_t kernel_blob_size;
1632
1633 if (fp->f_type != DTYPE_VNODE) {
1634 error = EBADF;
1635 goto out;
1636 }
1637 vp = (struct vnode *)fp->f_data;
1638 proc_fdunlock(p);
1639 error = vnode_getwithref(vp);
1640 if (error)
1641 goto outdrop;
1642
1643 if (IS_64BIT_PROCESS(p)) {
1644 error = copyin(argp, &fs, sizeof (fs));
1645 } else {
1646 struct user32_fsignatures fs32;
1647
1648 error = copyin(argp, &fs32, sizeof (fs32));
1649 fs.fs_file_start = fs32.fs_file_start;
1650 fs.fs_blob_start = CAST_USER_ADDR_T(fs32.fs_blob_start);
1651 fs.fs_blob_size = fs32.fs_blob_size;
1652 }
1653
1654 if (error) {
1655 vnode_put(vp);
1656 goto outdrop;
1657 }
1658
1659 if(ubc_cs_blob_get(vp, CPU_TYPE_ANY, fs.fs_file_start))
1660 {
1661 vnode_put(vp);
1662 goto outdrop;
1663 }
1664 /*
1665 * An arbitrary limit, to prevent someone from mapping in a 20GB blob. This should cover
1666 * our use cases for the immediate future, but note that at the time of this commit, some
1667 * platforms are nearing 2MB blob sizes (with a prior soft limit of 2.5MB).
1668 *
1669 * We should consider how we can manage this more effectively; the above means that some
1670 * platforms are using megabytes of memory for signing data; it merely hasn't crossed the
1671 * threshold considered ridiculous at the time of this change.
1672 */
1673 #define CS_MAX_BLOB_SIZE (10ULL * 1024ULL * 1024ULL)
1674 if (fs.fs_blob_size > CS_MAX_BLOB_SIZE) {
1675 error = E2BIG;
1676 vnode_put(vp);
1677 goto outdrop;
1678 }
1679
1680 kernel_blob_size = CAST_DOWN(vm_size_t, fs.fs_blob_size);
1681 kr = ubc_cs_blob_allocate(&kernel_blob_addr, &kernel_blob_size);
1682 if (kr != KERN_SUCCESS) {
1683 error = ENOMEM;
1684 vnode_put(vp);
1685 goto outdrop;
1686 }
1687
1688 if(uap->cmd == F_ADDSIGS) {
1689 error = copyin(fs.fs_blob_start,
1690 (void *) kernel_blob_addr,
1691 kernel_blob_size);
1692 } else /* F_ADDFILESIGS */ {
1693 error = vn_rdwr(UIO_READ,
1694 vp,
1695 (caddr_t) kernel_blob_addr,
1696 kernel_blob_size,
1697 fs.fs_file_start + fs.fs_blob_start,
1698 UIO_SYSSPACE,
1699 0,
1700 kauth_cred_get(),
1701 0,
1702 p);
1703 }
1704
1705 if (error) {
1706 ubc_cs_blob_deallocate(kernel_blob_addr,
1707 kernel_blob_size);
1708 vnode_put(vp);
1709 goto outdrop;
1710 }
1711
1712 error = ubc_cs_blob_add(
1713 vp,
1714 CPU_TYPE_ANY, /* not for a specific architecture */
1715 fs.fs_file_start,
1716 kernel_blob_addr,
1717 kernel_blob_size);
1718 if (error) {
1719 ubc_cs_blob_deallocate(kernel_blob_addr,
1720 kernel_blob_size);
1721 } else {
1722 /* ubc_blob_add() has consumed "kernel_blob_addr" */
1723 #if CHECK_CS_VALIDATION_BITMAP
1724 ubc_cs_validation_bitmap_allocate( vp );
1725 #endif
1726 }
1727
1728 (void) vnode_put(vp);
1729 break;
1730 }
1731 case F_FINDSIGS: {
1732 #ifdef SECURE_KERNEL
1733 error = ENOTSUP;
1734 #else /* !SECURE_KERNEL */
1735 off_t offsetMacho;
1736
1737 if (fp->f_type != DTYPE_VNODE) {
1738 error = EBADF;
1739 goto out;
1740 }
1741 vp = (struct vnode *)fp->f_data;
1742 proc_fdunlock(p);
1743 error = vnode_getwithref(vp);
1744 if (error)
1745 goto outdrop;
1746
1747 error = copyin(argp, &offsetMacho, sizeof(offsetMacho));
1748 if (error) {
1749 (void)vnode_put(vp);
1750 goto outdrop;
1751 }
1752
1753 #if CONFIG_MACF
1754 error = mac_vnode_find_sigs(p, vp, offsetMacho);
1755 #else
1756 error = EPERM;
1757 #endif
1758 if (error) {
1759 (void)vnode_put(vp);
1760 goto outdrop;
1761 }
1762 #endif /* SECURE_KERNEL */
1763 break;
1764 }
1765 #if CONFIG_PROTECT
1766 case F_GETPROTECTIONCLASS: {
1767 int class = 0;
1768
1769 if (fp->f_type != DTYPE_VNODE) {
1770 error = EBADF;
1771 goto out;
1772 }
1773 vp = (struct vnode *)fp->f_data;
1774
1775 proc_fdunlock(p);
1776
1777 if (vnode_getwithref(vp)) {
1778 error = ENOENT;
1779 goto outdrop;
1780 }
1781
1782 error = cp_vnode_getclass (vp, &class);
1783 if (error == 0) {
1784 *retval = class;
1785 }
1786
1787 vnode_put(vp);
1788 break;
1789 }
1790
1791 case F_SETPROTECTIONCLASS: {
1792 /* tmp must be a valid PROTECTION_CLASS_* */
1793 tmp = CAST_DOWN_EXPLICIT(uint32_t, uap->arg);
1794
1795 if (fp->f_type != DTYPE_VNODE) {
1796 error = EBADF;
1797 goto out;
1798 }
1799 vp = (struct vnode *)fp->f_data;
1800
1801 proc_fdunlock(p);
1802
1803 if (vnode_getwithref(vp)) {
1804 error = ENOENT;
1805 goto outdrop;
1806 }
1807
1808 /* Only go forward if you have write access */
1809 vfs_context_t ctx = vfs_context_current();
1810 if(vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
1811 vnode_put(vp);
1812 error = EBADF;
1813 goto outdrop;
1814 }
1815 error = cp_vnode_setclass (vp, tmp);
1816 vnode_put(vp);
1817 break;
1818 }
1819
1820 case F_TRANSCODEKEY: {
1821
1822 char *backup_keyp = NULL;
1823 unsigned backup_key_len = CP_MAX_WRAPPEDKEYSIZE;
1824
1825 if (fp->f_type != DTYPE_VNODE) {
1826 error = EBADF;
1827 goto out;
1828 }
1829
1830 vp = (struct vnode *)fp->f_data;
1831 proc_fdunlock(p);
1832
1833 if (vnode_getwithref(vp)) {
1834 error = ENOENT;
1835 goto outdrop;
1836 }
1837
1838 MALLOC(backup_keyp, char *, backup_key_len, M_TEMP, M_WAITOK);
1839 if (backup_keyp == NULL) {
1840 error = ENOMEM;
1841 goto outdrop;
1842 }
1843
1844 error = cp_vnode_transcode (vp, backup_keyp, &backup_key_len);
1845 vnode_put(vp);
1846
1847 if (error == 0) {
1848 error = copyout((caddr_t)backup_keyp, argp, backup_key_len);
1849 *retval = backup_key_len;
1850 }
1851
1852 FREE(backup_keyp, M_TEMP);
1853
1854 break;
1855 }
1856
1857 case F_GETPROTECTIONLEVEL: {
1858 uint32_t cp_version = 0;
1859
1860 if (fp->f_type != DTYPE_VNODE) {
1861 error = EBADF;
1862 goto out;
1863 }
1864
1865 vp = (struct vnode*) fp->f_data;
1866 proc_fdunlock (p);
1867
1868 if (vnode_getwithref(vp)) {
1869 error = ENOENT;
1870 goto outdrop;
1871 }
1872
1873 /*
1874 * if cp_get_major_vers fails, error will be set to proper errno
1875 * and cp_version will still be 0.
1876 */
1877
1878 error = cp_get_root_major_vers (vp, &cp_version);
1879 *retval = cp_version;
1880
1881 vnode_put (vp);
1882 break;
1883 }
1884
1885 case F_GETDEFAULTPROTLEVEL: {
1886 uint32_t cp_default = 0;
1887
1888 if (fp->f_type != DTYPE_VNODE) {
1889 error = EBADF;
1890 goto out;
1891 }
1892
1893 vp = (struct vnode*) fp->f_data;
1894 proc_fdunlock (p);
1895
1896 if (vnode_getwithref(vp)) {
1897 error = ENOENT;
1898 goto outdrop;
1899 }
1900
1901 /*
1902 * if cp_get_major_vers fails, error will be set to proper errno
1903 * and cp_version will still be 0.
1904 */
1905
1906 error = cp_get_default_level(vp, &cp_default);
1907 *retval = cp_default;
1908
1909 vnode_put (vp);
1910 break;
1911 }
1912
1913
1914 #endif /* CONFIG_PROTECT */
1915
1916 case F_MOVEDATAEXTENTS: {
1917 struct fileproc *fp2 = NULL;
1918 struct vnode *src_vp = NULLVP;
1919 struct vnode *dst_vp = NULLVP;
1920 /* We need to grab the 2nd FD out of the argments before moving on. */
1921 int fd2 = CAST_DOWN_EXPLICIT(int32_t, uap->arg);
1922
1923 if (fp->f_type != DTYPE_VNODE) {
1924 error = EBADF;
1925 goto out;
1926 }
1927
1928 /* For now, special case HFS+ only, since this is SPI. */
1929 src_vp = (struct vnode *)fp->f_data;
1930 if (src_vp->v_tag != VT_HFS) {
1931 error = EINVAL;
1932 goto out;
1933 }
1934
1935 /*
1936 * Get the references before we start acquiring iocounts on the vnodes,
1937 * while we still hold the proc fd lock
1938 */
1939 if ( (error = fp_lookup(p, fd2, &fp2, 1)) ) {
1940 error = EBADF;
1941 goto out;
1942 }
1943 if (fp2->f_type != DTYPE_VNODE) {
1944 fp_drop(p, fd2, fp2, 1);
1945 error = EBADF;
1946 goto out;
1947 }
1948 dst_vp = (struct vnode *)fp2->f_data;
1949 if (dst_vp->v_tag != VT_HFS) {
1950 fp_drop(p, fd2, fp2, 1);
1951 error = EINVAL;
1952 goto out;
1953 }
1954
1955 #if CONFIG_MACF
1956 /* Re-do MAC checks against the new FD, pass in a fake argument */
1957 error = mac_file_check_fcntl(proc_ucred(p), fp2->f_fglob, uap->cmd, 0);
1958 if (error) {
1959 fp_drop(p, fd2, fp2, 1);
1960 goto out;
1961 }
1962 #endif
1963 /* Audit the 2nd FD */
1964 AUDIT_ARG(fd, fd2);
1965
1966 proc_fdunlock(p);
1967
1968 if (vnode_getwithref(src_vp)) {
1969 fp_drop(p, fd2, fp2, 0);
1970 error = ENOENT;
1971 goto outdrop;
1972 }
1973 if (vnode_getwithref(dst_vp)) {
1974 vnode_put (src_vp);
1975 fp_drop(p, fd2, fp2, 0);
1976 error = ENOENT;
1977 goto outdrop;
1978 }
1979
1980 /*
1981 * Basic asserts; validate they are not the same and that
1982 * both live on the same filesystem.
1983 */
1984 if (dst_vp == src_vp) {
1985 vnode_put (src_vp);
1986 vnode_put (dst_vp);
1987 fp_drop (p, fd2, fp2, 0);
1988 error = EINVAL;
1989 goto outdrop;
1990 }
1991
1992 if (dst_vp->v_mount != src_vp->v_mount) {
1993 vnode_put (src_vp);
1994 vnode_put (dst_vp);
1995 fp_drop (p, fd2, fp2, 0);
1996 error = EXDEV;
1997 goto outdrop;
1998 }
1999
2000 /* Now we have a legit pair of FDs. Go to work */
2001
2002 /* Now check for write access to the target files */
2003 if(vnode_authorize(src_vp, NULLVP,
2004 (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), &context) != 0) {
2005 vnode_put(src_vp);
2006 vnode_put(dst_vp);
2007 fp_drop(p, fd2, fp2, 0);
2008 error = EBADF;
2009 goto outdrop;
2010 }
2011
2012 if(vnode_authorize(dst_vp, NULLVP,
2013 (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), &context) != 0) {
2014 vnode_put(src_vp);
2015 vnode_put(dst_vp);
2016 fp_drop(p, fd2, fp2, 0);
2017 error = EBADF;
2018 goto outdrop;
2019 }
2020
2021 /* Verify that both vps point to files and not directories */
2022 if ( !vnode_isreg(src_vp) || !vnode_isreg(dst_vp)) {
2023 error = EINVAL;
2024 vnode_put (src_vp);
2025 vnode_put (dst_vp);
2026 fp_drop (p, fd2, fp2, 0);
2027 goto outdrop;
2028 }
2029
2030 /*
2031 * The exchangedata syscall handler passes in 0 for the flags to VNOP_EXCHANGE.
2032 * We'll pass in our special bit indicating that the new behavior is expected
2033 */
2034
2035 error = VNOP_EXCHANGE(src_vp, dst_vp, FSOPT_EXCHANGE_DATA_ONLY, &context);
2036
2037 vnode_put (src_vp);
2038 vnode_put (dst_vp);
2039 fp_drop(p, fd2, fp2, 0);
2040 break;
2041 }
2042
2043 /*
2044 * SPI for making a file compressed.
2045 */
2046 case F_MAKECOMPRESSED: {
2047 uint32_t gcounter = CAST_DOWN_EXPLICIT(uint32_t, uap->arg);
2048
2049 if (fp->f_type != DTYPE_VNODE) {
2050 error = EBADF;
2051 goto out;
2052 }
2053
2054 vp = (struct vnode*) fp->f_data;
2055 proc_fdunlock (p);
2056
2057 /* get the vnode */
2058 if (vnode_getwithref(vp)) {
2059 error = ENOENT;
2060 goto outdrop;
2061 }
2062
2063 /* Is it a file? */
2064 if ((vnode_isreg(vp) == 0) && (vnode_islnk(vp) == 0)) {
2065 vnode_put(vp);
2066 error = EBADF;
2067 goto outdrop;
2068 }
2069
2070 /* invoke ioctl to pass off to FS */
2071 /* Only go forward if you have write access */
2072 vfs_context_t ctx = vfs_context_current();
2073 if(vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
2074 vnode_put(vp);
2075 error = EBADF;
2076 goto outdrop;
2077 }
2078
2079 error = VNOP_IOCTL(vp, uap->cmd, (caddr_t)&gcounter, 0, &context);
2080
2081 vnode_put (vp);
2082 break;
2083 }
2084
2085 /*
2086 * SPI (private) for indicating to a filesystem that subsequent writes to
2087 * the open FD will written to the Fastflow.
2088 */
2089 case F_SET_GREEDY_MODE:
2090 /* intentionally drop through to the same handler as F_SETSTATIC.
2091 * both fcntls should pass the argument and their selector into VNOP_IOCTL.
2092 */
2093
2094 /*
2095 * SPI (private) for indicating to a filesystem that subsequent writes to
2096 * the open FD will represent static content.
2097 */
2098 case F_SETSTATICCONTENT: {
2099 caddr_t ioctl_arg = NULL;
2100
2101 if (uap->arg) {
2102 ioctl_arg = (caddr_t) 1;
2103 }
2104
2105 if (fp->f_type != DTYPE_VNODE) {
2106 error = EBADF;
2107 goto out;
2108 }
2109 vp = (struct vnode *)fp->f_data;
2110 proc_fdunlock(p);
2111
2112 error = vnode_getwithref(vp);
2113 if (error) {
2114 error = ENOENT;
2115 goto outdrop;
2116 }
2117
2118 /* Only go forward if you have write access */
2119 vfs_context_t ctx = vfs_context_current();
2120 if(vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
2121 vnode_put(vp);
2122 error = EBADF;
2123 goto outdrop;
2124 }
2125
2126 error = VNOP_IOCTL(vp, uap->cmd, ioctl_arg, 0, &context);
2127 (void)vnode_put(vp);
2128
2129 break;
2130 }
2131
2132 /*
2133 * SPI (private) for indicating to the lower level storage driver that the
2134 * subsequent writes should be of a particular IO type (burst, greedy, static),
2135 * or other flavors that may be necessary.
2136 */
2137 case F_SETIOTYPE: {
2138 caddr_t param_ptr;
2139 uint32_t param;
2140
2141 if (uap->arg) {
2142 /* extract 32 bits of flags from userland */
2143 param_ptr = (caddr_t) uap->arg;
2144 param = (uint32_t) param_ptr;
2145 }
2146 else {
2147 /* If no argument is specified, error out */
2148 error = EINVAL;
2149 goto out;
2150 }
2151
2152 /*
2153 * Validate the different types of flags that can be specified:
2154 * all of them are mutually exclusive for now.
2155 */
2156 switch (param) {
2157 case F_IOTYPE_ISOCHRONOUS:
2158 break;
2159
2160 default:
2161 error = EINVAL;
2162 goto out;
2163 }
2164
2165
2166 if (fp->f_type != DTYPE_VNODE) {
2167 error = EBADF;
2168 goto out;
2169 }
2170 vp = (struct vnode *)fp->f_data;
2171 proc_fdunlock(p);
2172
2173 error = vnode_getwithref(vp);
2174 if (error) {
2175 error = ENOENT;
2176 goto outdrop;
2177 }
2178
2179 /* Only go forward if you have write access */
2180 vfs_context_t ctx = vfs_context_current();
2181 if(vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
2182 vnode_put(vp);
2183 error = EBADF;
2184 goto outdrop;
2185 }
2186
2187 error = VNOP_IOCTL(vp, uap->cmd, param_ptr, 0, &context);
2188 (void)vnode_put(vp);
2189
2190 break;
2191 }
2192
2193
2194 /*
2195 * Extract the CodeDirectory of the vnode associated with
2196 * the file descriptor and copy it back to user space
2197 */
2198 case F_GETCODEDIR: {
2199 struct user_fcodeblobs args;
2200
2201 if (fp->f_type != DTYPE_VNODE) {
2202 error = EBADF;
2203 goto out;
2204 }
2205
2206 vp = (struct vnode *)fp->f_data;
2207 proc_fdunlock(p);
2208
2209 if ((fp->f_flag & FREAD) == 0) {
2210 error = EBADF;
2211 goto outdrop;
2212 }
2213
2214 if (IS_64BIT_PROCESS(p)) {
2215 struct user64_fcodeblobs args64;
2216
2217 error = copyin(argp, &args64, sizeof(args64));
2218 if (error)
2219 goto outdrop;
2220
2221 args.f_cd_hash = args64.f_cd_hash;
2222 args.f_hash_size = args64.f_hash_size;
2223 args.f_cd_buffer = args64.f_cd_buffer;
2224 args.f_cd_size = args64.f_cd_size;
2225 args.f_out_size = args64.f_out_size;
2226 args.f_arch = args64.f_arch;
2227 } else {
2228 struct user32_fcodeblobs args32;
2229
2230 error = copyin(argp, &args32, sizeof(args32));
2231 if (error)
2232 goto outdrop;
2233
2234 args.f_cd_hash = CAST_USER_ADDR_T(args32.f_cd_hash);
2235 args.f_hash_size = args32.f_hash_size;
2236 args.f_cd_buffer = CAST_USER_ADDR_T(args32.f_cd_buffer);
2237 args.f_cd_size = args32.f_cd_size;
2238 args.f_out_size = CAST_USER_ADDR_T(args32.f_out_size);
2239 args.f_arch = args32.f_arch;
2240 }
2241
2242 if (vp->v_ubcinfo == NULL) {
2243 error = EINVAL;
2244 goto outdrop;
2245 }
2246
2247 struct cs_blob *t_blob = vp->v_ubcinfo->cs_blobs;
2248
2249 /*
2250 * This call fails if there is no cs_blob corresponding to the
2251 * vnode, or if there are multiple cs_blobs present, and the caller
2252 * did not specify which cpu_type they want the cs_blob for
2253 */
2254 if (t_blob == NULL) {
2255 error = ENOENT; /* there is no codesigning blob for this process */
2256 goto outdrop;
2257 } else if (args.f_arch == 0 && t_blob->csb_next != NULL) {
2258 error = ENOENT; /* too many architectures and none specified */
2259 goto outdrop;
2260 }
2261
2262 /* If the user specified an architecture, find the right blob */
2263 if (args.f_arch != 0) {
2264 while (t_blob) {
2265 if (t_blob->csb_cpu_type == args.f_arch)
2266 break;
2267 t_blob = t_blob->csb_next;
2268 }
2269 /* The cpu_type the user requested could not be found */
2270 if (t_blob == NULL) {
2271 error = ENOENT;
2272 goto outdrop;
2273 }
2274 }
2275
2276 const CS_SuperBlob *super_blob = (void *)t_blob->csb_mem_kaddr;
2277 const CS_CodeDirectory *cd = findCodeDirectory(super_blob,
2278 (char *) super_blob,
2279 (char *) super_blob + t_blob->csb_mem_size);
2280 if (cd == NULL) {
2281 error = ENOENT;
2282 goto outdrop;
2283 }
2284
2285 uint64_t buffer_size = ntohl(cd->length);
2286
2287 if (buffer_size > UINT_MAX) {
2288 error = ERANGE;
2289 goto outdrop;
2290 }
2291
2292 error = copyout(&buffer_size, args.f_out_size, sizeof(unsigned int));
2293 if (error)
2294 goto outdrop;
2295
2296 if (sizeof(t_blob->csb_sha1) > args.f_hash_size ||
2297 buffer_size > args.f_cd_size) {
2298 error = ERANGE;
2299 goto outdrop;
2300 }
2301
2302 error = copyout(t_blob->csb_sha1, args.f_cd_hash, sizeof(t_blob->csb_sha1));
2303 if (error)
2304 goto outdrop;
2305 error = copyout(cd, args.f_cd_buffer, buffer_size);
2306 if (error)
2307 goto outdrop;
2308
2309 break;
2310 }
2311
2312 /*
2313 * Set the vnode pointed to by 'fd'
2314 * and tag it as the (potentially future) backing store
2315 * for another filesystem
2316 */
2317 case F_SETBACKINGSTORE: {
2318 if (fp->f_type != DTYPE_VNODE) {
2319 error = EBADF;
2320 goto out;
2321 }
2322
2323 vp = (struct vnode *)fp->f_data;
2324
2325 if (vp->v_tag != VT_HFS) {
2326 error = EINVAL;
2327 goto out;
2328 }
2329 proc_fdunlock(p);
2330
2331 if (vnode_getwithref(vp)) {
2332 error = ENOENT;
2333 goto outdrop;
2334 }
2335
2336 /* only proceed if you have write access */
2337 vfs_context_t ctx = vfs_context_current();
2338 if(vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
2339 vnode_put(vp);
2340 error = EBADF;
2341 goto outdrop;
2342 }
2343
2344
2345 /* If arg != 0, set, otherwise unset */
2346 if (uap->arg) {
2347 error = VNOP_IOCTL (vp, uap->cmd, (caddr_t)1, 0, &context);
2348 }
2349 else {
2350 error = VNOP_IOCTL (vp, uap->cmd, (caddr_t)NULL, 0, &context);
2351 }
2352
2353 vnode_put(vp);
2354 break;
2355 }
2356
2357 /*
2358 * like F_GETPATH, but special semantics for
2359 * the mobile time machine handler.
2360 */
2361 case F_GETPATH_MTMINFO: {
2362 char *pathbufp;
2363 int pathlen;
2364
2365 if (fp->f_type != DTYPE_VNODE) {
2366 error = EBADF;
2367 goto out;
2368 }
2369 vp = (struct vnode *)fp->f_data;
2370 proc_fdunlock(p);
2371
2372 pathlen = MAXPATHLEN;
2373 MALLOC(pathbufp, char *, pathlen, M_TEMP, M_WAITOK);
2374 if (pathbufp == NULL) {
2375 error = ENOMEM;
2376 goto outdrop;
2377 }
2378 if ( (error = vnode_getwithref(vp)) == 0 ) {
2379 int backingstore = 0;
2380
2381 /* Check for error from vn_getpath before moving on */
2382 if ((error = vn_getpath(vp, pathbufp, &pathlen)) == 0) {
2383 if (vp->v_tag == VT_HFS) {
2384 error = VNOP_IOCTL (vp, uap->cmd, (caddr_t) &backingstore, 0, &context);
2385 }
2386 (void)vnode_put(vp);
2387
2388 if (error == 0) {
2389 error = copyout((caddr_t)pathbufp, argp, pathlen);
2390 }
2391 if (error == 0) {
2392 /*
2393 * If the copyout was successful, now check to ensure
2394 * that this vnode is not a BACKINGSTORE vnode. mtmd
2395 * wants the path regardless.
2396 */
2397 if (backingstore) {
2398 error = EBUSY;
2399 }
2400 }
2401 } else
2402 (void)vnode_put(vp);
2403 }
2404 FREE(pathbufp, M_TEMP);
2405 goto outdrop;
2406 }
2407
2408 default:
2409 /*
2410 * This is an fcntl() that we d not recognize at this level;
2411 * if this is a vnode, we send it down into the VNOP_IOCTL
2412 * for this vnode; this can include special devices, and will
2413 * effectively overload fcntl() to send ioctl()'s.
2414 */
2415 if((uap->cmd & IOC_VOID) && (uap->cmd & IOC_INOUT)){
2416 error = EINVAL;
2417 goto out;
2418 }
2419
2420 /* Catch any now-invalid fcntl() selectors */
2421 switch (uap->cmd) {
2422 case F_MARKDEPENDENCY:
2423 error = EINVAL;
2424 goto out;
2425 default:
2426 break;
2427 }
2428
2429 if (fp->f_type != DTYPE_VNODE) {
2430 error = EBADF;
2431 goto out;
2432 }
2433 vp = (struct vnode *)fp->f_data;
2434 proc_fdunlock(p);
2435
2436 if ( (error = vnode_getwithref(vp)) == 0 ) {
2437 #define STK_PARAMS 128
2438 char stkbuf[STK_PARAMS];
2439 unsigned int size;
2440 caddr_t data, memp;
2441 /*
2442 * For this to work properly, we have to copy in the
2443 * ioctl() cmd argument if there is one; we must also
2444 * check that a command parameter, if present, does
2445 * not exceed the maximum command length dictated by
2446 * the number of bits we have available in the command
2447 * to represent a structure length. Finally, we have
2448 * to copy the results back out, if it is that type of
2449 * ioctl().
2450 */
2451 size = IOCPARM_LEN(uap->cmd);
2452 if (size > IOCPARM_MAX) {
2453 (void)vnode_put(vp);
2454 error = EINVAL;
2455 break;
2456 }
2457
2458 memp = NULL;
2459 if (size > sizeof (stkbuf)) {
2460 if ((memp = (caddr_t)kalloc(size)) == 0) {
2461 (void)vnode_put(vp);
2462 error = ENOMEM;
2463 goto outdrop;
2464 }
2465 data = memp;
2466 } else {
2467 data = &stkbuf[0];
2468 }
2469
2470 if (uap->cmd & IOC_IN) {
2471 if (size) {
2472 /* structure */
2473 error = copyin(argp, data, size);
2474 if (error) {
2475 (void)vnode_put(vp);
2476 if (memp)
2477 kfree(memp, size);
2478 goto outdrop;
2479 }
2480
2481 /* Bzero the section beyond that which was needed */
2482 if (size <= sizeof(stkbuf)) {
2483 bzero ( (((uint8_t*)data) + size), (sizeof(stkbuf) - size));
2484 }
2485 } else {
2486 /* int */
2487 if (is64bit) {
2488 *(user_addr_t *)data = argp;
2489 } else {
2490 *(uint32_t *)data = (uint32_t)argp;
2491 }
2492 };
2493 } else if ((uap->cmd & IOC_OUT) && size) {
2494 /*
2495 * Zero the buffer so the user always
2496 * gets back something deterministic.
2497 */
2498 bzero(data, size);
2499 } else if (uap->cmd & IOC_VOID) {
2500 if (is64bit) {
2501 *(user_addr_t *)data = argp;
2502 } else {
2503 *(uint32_t *)data = (uint32_t)argp;
2504 }
2505 }
2506
2507 error = VNOP_IOCTL(vp, uap->cmd, CAST_DOWN(caddr_t, data), 0, &context);
2508
2509 (void)vnode_put(vp);
2510
2511 /* Copy any output data to user */
2512 if (error == 0 && (uap->cmd & IOC_OUT) && size)
2513 error = copyout(data, argp, size);
2514 if (memp)
2515 kfree(memp, size);
2516 }
2517 break;
2518 }
2519
2520 outdrop:
2521 AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
2522 fp_drop(p, fd, fp, 0);
2523 return(error);
2524 out:
2525 fp_drop(p, fd, fp, 1);
2526 proc_fdunlock(p);
2527 return(error);
2528 }
2529
2530
2531 /*
2532 * finishdup
2533 *
2534 * Description: Common code for dup, dup2, and fcntl(F_DUPFD).
2535 *
2536 * Parameters: p Process performing the dup
2537 * old The fd to dup
2538 * new The fd to dup it to
2539 * fd_flags Flags to augment the new fd
2540 * retval Pointer to the call return area
2541 *
2542 * Returns: 0 Success
2543 * EBADF
2544 * ENOMEM
2545 *
2546 * Implicit returns:
2547 * *retval (modified) The new descriptor
2548 *
2549 * Locks: Assumes proc_fdlock for process pointing to fdp is held by
2550 * the caller
2551 *
2552 * Notes: This function may drop and reacquire this lock; it is unsafe
2553 * for a caller to assume that other state protected by the lock
2554 * has not been subsequently changed out from under it.
2555 */
2556 int
2557 finishdup(proc_t p,
2558 struct filedesc *fdp, int old, int new, int fd_flags, int32_t *retval)
2559 {
2560 struct fileproc *nfp;
2561 struct fileproc *ofp;
2562 #if CONFIG_MACF
2563 int error;
2564 #endif
2565
2566 #if DIAGNOSTIC
2567 proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
2568 #endif
2569 if ((ofp = fdp->fd_ofiles[old]) == NULL ||
2570 (fdp->fd_ofileflags[old] & UF_RESERVED)) {
2571 fdrelse(p, new);
2572 return (EBADF);
2573 }
2574 fg_ref(ofp);
2575
2576 #if CONFIG_MACF
2577 error = mac_file_check_dup(proc_ucred(p), ofp->f_fglob, new);
2578 if (error) {
2579 fg_drop(ofp);
2580 fdrelse(p, new);
2581 return (error);
2582 }
2583 #endif
2584
2585 proc_fdunlock(p);
2586
2587 nfp = fileproc_alloc_init(NULL);
2588
2589 proc_fdlock(p);
2590
2591 if (nfp == NULL) {
2592 fg_drop(ofp);
2593 fdrelse(p, new);
2594 return (ENOMEM);
2595 }
2596
2597 nfp->f_fglob = ofp->f_fglob;
2598
2599 #if DIAGNOSTIC
2600 if (fdp->fd_ofiles[new] != 0)
2601 panic("finishdup: overwriting fd_ofiles with new %d", new);
2602 if ((fdp->fd_ofileflags[new] & UF_RESERVED) == 0)
2603 panic("finishdup: unreserved fileflags with new %d", new);
2604 #endif
2605
2606 if (new > fdp->fd_lastfile)
2607 fdp->fd_lastfile = new;
2608 *fdflags(p, new) |= fd_flags;
2609 procfdtbl_releasefd(p, new, nfp);
2610 *retval = new;
2611 return (0);
2612 }
2613
2614
2615 /*
2616 * close
2617 *
2618 * Description: The implementation of the close(2) system call
2619 *
2620 * Parameters: p Process in whose per process file table
2621 * the close is to occur
2622 * uap->fd fd to be closed
2623 * retval <unused>
2624 *
2625 * Returns: 0 Success
2626 * fp_lookup:EBADF Bad file descriptor
2627 * fp_guard_exception:??? Guarded file descriptor
2628 * close_internal:EBADF
2629 * close_internal:??? Anything returnable by a per-fileops
2630 * close function
2631 */
2632 int
2633 close(proc_t p, struct close_args *uap, int32_t *retval)
2634 {
2635 __pthread_testcancel(1);
2636 return(close_nocancel(p, (struct close_nocancel_args *)uap, retval));
2637 }
2638
2639
2640 int
2641 close_nocancel(proc_t p, struct close_nocancel_args *uap, __unused int32_t *retval)
2642 {
2643 struct fileproc *fp;
2644 int fd = uap->fd;
2645 int error;
2646
2647 AUDIT_SYSCLOSE(p, fd);
2648
2649 proc_fdlock(p);
2650
2651 if ( (error = fp_lookup(p,fd,&fp, 1)) ) {
2652 proc_fdunlock(p);
2653 return(error);
2654 }
2655
2656 if (FP_ISGUARDED(fp, GUARD_CLOSE)) {
2657 error = fp_guard_exception(p, fd, fp, kGUARD_EXC_CLOSE);
2658 (void) fp_drop(p, fd, fp, 1);
2659 proc_fdunlock(p);
2660 return (error);
2661 }
2662
2663 error = close_internal_locked(p, fd, fp, 0);
2664
2665 proc_fdunlock(p);
2666
2667 return (error);
2668 }
2669
2670
2671 /*
2672 * close_internal_locked
2673 *
2674 * Close a file descriptor.
2675 *
2676 * Parameters: p Process in whose per process file table
2677 * the close is to occur
2678 * fd fd to be closed
2679 * fp fileproc associated with the fd
2680 *
2681 * Returns: 0 Success
2682 * EBADF fd already in close wait state
2683 * closef_locked:??? Anything returnable by a per-fileops
2684 * close function
2685 *
2686 * Locks: Assumes proc_fdlock for process is held by the caller and returns
2687 * with lock held
2688 *
2689 * Notes: This function may drop and reacquire this lock; it is unsafe
2690 * for a caller to assume that other state protected by the lock
2691 * has not been subsequently changed out from under it.
2692 */
2693 int
2694 close_internal_locked(proc_t p, int fd, struct fileproc *fp, int flags)
2695 {
2696 struct filedesc *fdp = p->p_fd;
2697 int error =0;
2698 int resvfd = flags & FD_DUP2RESV;
2699
2700
2701 #if DIAGNOSTIC
2702 proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
2703 #endif
2704
2705 /* Keep people from using the filedesc while we are closing it */
2706 procfdtbl_markclosefd(p, fd);
2707
2708
2709 if ((fp->f_flags & FP_CLOSING) == FP_CLOSING) {
2710 panic("close_internal_locked: being called on already closing fd");
2711 }
2712
2713
2714 #if DIAGNOSTIC
2715 if ((fdp->fd_ofileflags[fd] & UF_RESERVED) == 0)
2716 panic("close_internal: unreserved fileflags with fd %d", fd);
2717 #endif
2718
2719 fp->f_flags |= FP_CLOSING;
2720
2721 if ( (fp->f_flags & FP_AIOISSUED) || kauth_authorize_fileop_has_listeners() ) {
2722
2723 proc_fdunlock(p);
2724
2725 if ( (fp->f_type == DTYPE_VNODE) && kauth_authorize_fileop_has_listeners() ) {
2726 /*
2727 * call out to allow 3rd party notification of close.
2728 * Ignore result of kauth_authorize_fileop call.
2729 */
2730 if (vnode_getwithref((vnode_t)fp->f_data) == 0) {
2731 u_int fileop_flags = 0;
2732 if ((fp->f_flags & FP_WRITTEN) != 0)
2733 fileop_flags |= KAUTH_FILEOP_CLOSE_MODIFIED;
2734 kauth_authorize_fileop(fp->f_fglob->fg_cred, KAUTH_FILEOP_CLOSE,
2735 (uintptr_t)fp->f_data, (uintptr_t)fileop_flags);
2736 vnode_put((vnode_t)fp->f_data);
2737 }
2738 }
2739 if (fp->f_flags & FP_AIOISSUED)
2740 /*
2741 * cancel all async IO requests that can be cancelled.
2742 */
2743 _aio_close( p, fd );
2744
2745 proc_fdlock(p);
2746 }
2747
2748 if (fd < fdp->fd_knlistsize)
2749 knote_fdclose(p, fd);
2750
2751 if (fp->f_flags & FP_WAITEVENT)
2752 (void)waitevent_close(p, fp);
2753
2754 fileproc_drain(p, fp);
2755
2756 if (resvfd == 0) {
2757 _fdrelse(p, fd);
2758 } else {
2759 procfdtbl_reservefd(p, fd);
2760 }
2761
2762 error = closef_locked(fp, fp->f_fglob, p);
2763 if ((fp->f_flags & FP_WAITCLOSE) == FP_WAITCLOSE)
2764 wakeup(&fp->f_flags);
2765 fp->f_flags &= ~(FP_WAITCLOSE | FP_CLOSING);
2766
2767 proc_fdunlock(p);
2768
2769 fileproc_free(fp);
2770
2771 proc_fdlock(p);
2772
2773 #if DIAGNOSTIC
2774 if (resvfd != 0) {
2775 if ((fdp->fd_ofileflags[fd] & UF_RESERVED) == 0)
2776 panic("close with reserved fd returns with freed fd:%d: proc: %p", fd, p);
2777 }
2778 #endif
2779
2780 return(error);
2781 }
2782
2783
2784 /*
2785 * fstat1
2786 *
2787 * Description: Return status information about a file descriptor.
2788 *
2789 * Parameters: p The process doing the fstat
2790 * fd The fd to stat
2791 * ub The user stat buffer
2792 * xsecurity The user extended security
2793 * buffer, or 0 if none
2794 * xsecurity_size The size of xsecurity, or 0
2795 * if no xsecurity
2796 * isstat64 Flag to indicate 64 bit version
2797 * for inode size, etc.
2798 *
2799 * Returns: 0 Success
2800 * EBADF
2801 * EFAULT
2802 * fp_lookup:EBADF Bad file descriptor
2803 * vnode_getwithref:???
2804 * copyout:EFAULT
2805 * vnode_getwithref:???
2806 * vn_stat:???
2807 * soo_stat:???
2808 * pipe_stat:???
2809 * pshm_stat:???
2810 * kqueue_stat:???
2811 *
2812 * Notes: Internal implementation for all other fstat() related
2813 * functions
2814 *
2815 * XXX switch on node type is bogus; need a stat in struct
2816 * XXX fileops instead.
2817 */
2818 static int
2819 fstat1(proc_t p, int fd, user_addr_t ub, user_addr_t xsecurity, user_addr_t xsecurity_size, int isstat64)
2820 {
2821 struct fileproc *fp;
2822 union {
2823 struct stat sb;
2824 struct stat64 sb64;
2825 } source;
2826 union {
2827 struct user64_stat user64_sb;
2828 struct user32_stat user32_sb;
2829 struct user64_stat64 user64_sb64;
2830 struct user32_stat64 user32_sb64;
2831 } dest;
2832 int error, my_size;
2833 file_type_t type;
2834 caddr_t data;
2835 kauth_filesec_t fsec;
2836 user_size_t xsecurity_bufsize;
2837 vfs_context_t ctx = vfs_context_current();
2838 void * sbptr;
2839
2840
2841 AUDIT_ARG(fd, fd);
2842
2843 if ((error = fp_lookup(p, fd, &fp, 0)) != 0) {
2844 return(error);
2845 }
2846 type = fp->f_type;
2847 data = fp->f_data;
2848 fsec = KAUTH_FILESEC_NONE;
2849
2850 sbptr = (void *)&source;
2851
2852 switch (type) {
2853
2854 case DTYPE_VNODE:
2855 if ((error = vnode_getwithref((vnode_t)data)) == 0) {
2856 /*
2857 * If the caller has the file open, and is not
2858 * requesting extended security information, we are
2859 * going to let them get the basic stat information.
2860 */
2861 if (xsecurity == USER_ADDR_NULL) {
2862 error = vn_stat_noauth((vnode_t)data, sbptr, NULL, isstat64, ctx);
2863 } else {
2864 error = vn_stat((vnode_t)data, sbptr, &fsec, isstat64, ctx);
2865 }
2866
2867 AUDIT_ARG(vnpath, (struct vnode *)data, ARG_VNODE1);
2868 (void)vnode_put((vnode_t)data);
2869 }
2870 break;
2871
2872 #if SOCKETS
2873 case DTYPE_SOCKET:
2874 error = soo_stat((struct socket *)data, sbptr, isstat64);
2875 break;
2876 #endif /* SOCKETS */
2877
2878 case DTYPE_PIPE:
2879 error = pipe_stat((void *)data, sbptr, isstat64);
2880 break;
2881
2882 case DTYPE_PSXSHM:
2883 error = pshm_stat((void *)data, sbptr, isstat64);
2884 break;
2885
2886 case DTYPE_KQUEUE:
2887 error = kqueue_stat((void *)data, sbptr, isstat64, p);
2888 break;
2889
2890 default:
2891 error = EBADF;
2892 goto out;
2893 }
2894 if (error == 0) {
2895 caddr_t sbp;
2896
2897 if (isstat64 != 0) {
2898 source.sb64.st_lspare = 0;
2899 source.sb64.st_qspare[0] = 0LL;
2900 source.sb64.st_qspare[1] = 0LL;
2901
2902 if (IS_64BIT_PROCESS(current_proc())) {
2903 munge_user64_stat64(&source.sb64, &dest.user64_sb64);
2904 my_size = sizeof(dest.user64_sb64);
2905 sbp = (caddr_t)&dest.user64_sb64;
2906 } else {
2907 munge_user32_stat64(&source.sb64, &dest.user32_sb64);
2908 my_size = sizeof(dest.user32_sb64);
2909 sbp = (caddr_t)&dest.user32_sb64;
2910 }
2911 } else {
2912 source.sb.st_lspare = 0;
2913 source.sb.st_qspare[0] = 0LL;
2914 source.sb.st_qspare[1] = 0LL;
2915 if (IS_64BIT_PROCESS(current_proc())) {
2916 munge_user64_stat(&source.sb, &dest.user64_sb);
2917 my_size = sizeof(dest.user64_sb);
2918 sbp = (caddr_t)&dest.user64_sb;
2919 } else {
2920 munge_user32_stat(&source.sb, &dest.user32_sb);
2921 my_size = sizeof(dest.user32_sb);
2922 sbp = (caddr_t)&dest.user32_sb;
2923 }
2924 }
2925
2926 error = copyout(sbp, ub, my_size);
2927 }
2928
2929 /* caller wants extended security information? */
2930 if (xsecurity != USER_ADDR_NULL) {
2931
2932 /* did we get any? */
2933 if (fsec == KAUTH_FILESEC_NONE) {
2934 if (susize(xsecurity_size, 0) != 0) {
2935 error = EFAULT;
2936 goto out;
2937 }
2938 } else {
2939 /* find the user buffer size */
2940 xsecurity_bufsize = fusize(xsecurity_size);
2941
2942 /* copy out the actual data size */
2943 if (susize(xsecurity_size, KAUTH_FILESEC_COPYSIZE(fsec)) != 0) {
2944 error = EFAULT;
2945 goto out;
2946 }
2947
2948 /* if the caller supplied enough room, copy out to it */
2949 if (xsecurity_bufsize >= KAUTH_FILESEC_COPYSIZE(fsec))
2950 error = copyout(fsec, xsecurity, KAUTH_FILESEC_COPYSIZE(fsec));
2951 }
2952 }
2953 out:
2954 fp_drop(p, fd, fp, 0);
2955 if (fsec != NULL)
2956 kauth_filesec_free(fsec);
2957 return (error);
2958 }
2959
2960
2961 /*
2962 * fstat_extended
2963 *
2964 * Description: Extended version of fstat supporting returning extended
2965 * security information
2966 *
2967 * Parameters: p The process doing the fstat
2968 * uap->fd The fd to stat
2969 * uap->ub The user stat buffer
2970 * uap->xsecurity The user extended security
2971 * buffer, or 0 if none
2972 * uap->xsecurity_size The size of xsecurity, or 0
2973 *
2974 * Returns: 0 Success
2975 * !0 Errno (see fstat1)
2976 */
2977 int
2978 fstat_extended(proc_t p, struct fstat_extended_args *uap, __unused int32_t *retval)
2979 {
2980 return(fstat1(p, uap->fd, uap->ub, uap->xsecurity, uap->xsecurity_size, 0));
2981 }
2982
2983
2984 /*
2985 * fstat
2986 *
2987 * Description: Get file status for the file associated with fd
2988 *
2989 * Parameters: p The process doing the fstat
2990 * uap->fd The fd to stat
2991 * uap->ub The user stat buffer
2992 *
2993 * Returns: 0 Success
2994 * !0 Errno (see fstat1)
2995 */
2996 int
2997 fstat(proc_t p, register struct fstat_args *uap, __unused int32_t *retval)
2998 {
2999 return(fstat1(p, uap->fd, uap->ub, 0, 0, 0));
3000 }
3001
3002
3003 /*
3004 * fstat64_extended
3005 *
3006 * Description: Extended version of fstat64 supporting returning extended
3007 * security information
3008 *
3009 * Parameters: p The process doing the fstat
3010 * uap->fd The fd to stat
3011 * uap->ub The user stat buffer
3012 * uap->xsecurity The user extended security
3013 * buffer, or 0 if none
3014 * uap->xsecurity_size The size of xsecurity, or 0
3015 *
3016 * Returns: 0 Success
3017 * !0 Errno (see fstat1)
3018 */
3019 int
3020 fstat64_extended(proc_t p, struct fstat64_extended_args *uap, __unused int32_t *retval)
3021 {
3022 return(fstat1(p, uap->fd, uap->ub, uap->xsecurity, uap->xsecurity_size, 1));
3023 }
3024
3025
3026 /*
3027 * fstat64
3028 *
3029 * Description: Get 64 bit version of the file status for the file associated
3030 * with fd
3031 *
3032 * Parameters: p The process doing the fstat
3033 * uap->fd The fd to stat
3034 * uap->ub The user stat buffer
3035 *
3036 * Returns: 0 Success
3037 * !0 Errno (see fstat1)
3038 */
3039 int
3040 fstat64(proc_t p, register struct fstat64_args *uap, __unused int32_t *retval)
3041 {
3042 return(fstat1(p, uap->fd, uap->ub, 0, 0, 1));
3043 }
3044
3045
3046 /*
3047 * fpathconf
3048 *
3049 * Description: Return pathconf information about a file descriptor.
3050 *
3051 * Parameters: p Process making the request
3052 * uap->fd fd to get information about
3053 * uap->name Name of information desired
3054 * retval Pointer to the call return area
3055 *
3056 * Returns: 0 Success
3057 * EINVAL
3058 * fp_lookup:EBADF Bad file descriptor
3059 * vnode_getwithref:???
3060 * vn_pathconf:???
3061 *
3062 * Implicit returns:
3063 * *retval (modified) Returned information (numeric)
3064 */
3065 int
3066 fpathconf(proc_t p, struct fpathconf_args *uap, int32_t *retval)
3067 {
3068 int fd = uap->fd;
3069 struct fileproc *fp;
3070 struct vnode *vp;
3071 int error = 0;
3072 file_type_t type;
3073 caddr_t data;
3074
3075
3076 AUDIT_ARG(fd, uap->fd);
3077 if ( (error = fp_lookup(p, fd, &fp, 0)) )
3078 return(error);
3079 type = fp->f_type;
3080 data = fp->f_data;
3081
3082 switch (type) {
3083
3084 case DTYPE_SOCKET:
3085 if (uap->name != _PC_PIPE_BUF) {
3086 error = EINVAL;
3087 goto out;
3088 }
3089 *retval = PIPE_BUF;
3090 error = 0;
3091 goto out;
3092
3093 case DTYPE_PIPE:
3094 if (uap->name != _PC_PIPE_BUF) {
3095 error = EINVAL;
3096 goto out;
3097 }
3098 *retval = PIPE_BUF;
3099 error = 0;
3100 goto out;
3101
3102 case DTYPE_VNODE:
3103 vp = (struct vnode *)data;
3104
3105 if ( (error = vnode_getwithref(vp)) == 0) {
3106 AUDIT_ARG(vnpath, vp, ARG_VNODE1);
3107
3108 error = vn_pathconf(vp, uap->name, retval, vfs_context_current());
3109
3110 (void)vnode_put(vp);
3111 }
3112 goto out;
3113
3114 default:
3115 error = EINVAL;
3116 goto out;
3117
3118 }
3119 /*NOTREACHED*/
3120 out:
3121 fp_drop(p, fd, fp, 0);
3122 return(error);
3123 }
3124
3125 /*
3126 * Statistics counter for the number of times a process calling fdalloc()
3127 * has resulted in an expansion of the per process open file table.
3128 *
3129 * XXX This would likely be of more use if it were per process
3130 */
3131 int fdexpand;
3132
3133
3134 /*
3135 * fdalloc
3136 *
3137 * Description: Allocate a file descriptor for the process.
3138 *
3139 * Parameters: p Process to allocate the fd in
3140 * want The fd we would prefer to get
3141 * result Pointer to fd we got
3142 *
3143 * Returns: 0 Success
3144 * EMFILE
3145 * ENOMEM
3146 *
3147 * Implicit returns:
3148 * *result (modified) The fd which was allocated
3149 */
3150 int
3151 fdalloc(proc_t p, int want, int *result)
3152 {
3153 struct filedesc *fdp = p->p_fd;
3154 int i;
3155 int lim, last, numfiles, oldnfiles;
3156 struct fileproc **newofiles, **ofiles;
3157 char *newofileflags;
3158
3159 /*
3160 * Search for a free descriptor starting at the higher
3161 * of want or fd_freefile. If that fails, consider
3162 * expanding the ofile array.
3163 */
3164 #if DIAGNOSTIC
3165 proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
3166 #endif
3167
3168 lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
3169 for (;;) {
3170 last = min(fdp->fd_nfiles, lim);
3171 if ((i = want) < fdp->fd_freefile)
3172 i = fdp->fd_freefile;
3173 for (; i < last; i++) {
3174 if (fdp->fd_ofiles[i] == NULL && !(fdp->fd_ofileflags[i] & UF_RESERVED)) {
3175 procfdtbl_reservefd(p, i);
3176 if (i > fdp->fd_lastfile)
3177 fdp->fd_lastfile = i;
3178 if (want <= fdp->fd_freefile)
3179 fdp->fd_freefile = i;
3180 *result = i;
3181 return (0);
3182 }
3183 }
3184
3185 /*
3186 * No space in current array. Expand?
3187 */
3188 if (fdp->fd_nfiles >= lim)
3189 return (EMFILE);
3190 if (fdp->fd_nfiles < NDEXTENT)
3191 numfiles = NDEXTENT;
3192 else
3193 numfiles = 2 * fdp->fd_nfiles;
3194 /* Enforce lim */
3195 if (numfiles > lim)
3196 numfiles = lim;
3197 proc_fdunlock(p);
3198 MALLOC_ZONE(newofiles, struct fileproc **,
3199 numfiles * OFILESIZE, M_OFILETABL, M_WAITOK);
3200 proc_fdlock(p);
3201 if (newofiles == NULL) {
3202 return (ENOMEM);
3203 }
3204 if (fdp->fd_nfiles >= numfiles) {
3205 FREE_ZONE(newofiles, numfiles * OFILESIZE, M_OFILETABL);
3206 continue;
3207 }
3208 newofileflags = (char *) &newofiles[numfiles];
3209 /*
3210 * Copy the existing ofile and ofileflags arrays
3211 * and zero the new portion of each array.
3212 */
3213 oldnfiles = fdp->fd_nfiles;
3214 (void) memcpy(newofiles, fdp->fd_ofiles,
3215 oldnfiles * sizeof(*fdp->fd_ofiles));
3216 (void) memset(&newofiles[oldnfiles], 0,
3217 (numfiles - oldnfiles) * sizeof(*fdp->fd_ofiles));
3218
3219 (void) memcpy(newofileflags, fdp->fd_ofileflags,
3220 oldnfiles * sizeof(*fdp->fd_ofileflags));
3221 (void) memset(&newofileflags[oldnfiles], 0,
3222 (numfiles - oldnfiles) *
3223 sizeof(*fdp->fd_ofileflags));
3224 ofiles = fdp->fd_ofiles;
3225 fdp->fd_ofiles = newofiles;
3226 fdp->fd_ofileflags = newofileflags;
3227 fdp->fd_nfiles = numfiles;
3228 FREE_ZONE(ofiles, oldnfiles * OFILESIZE, M_OFILETABL);
3229 fdexpand++;
3230 }
3231 }
3232
3233
3234 /*
3235 * fdavail
3236 *
3237 * Description: Check to see whether n user file descriptors are available
3238 * to the process p.
3239 *
3240 * Parameters: p Process to check in
3241 * n The number of fd's desired
3242 *
3243 * Returns: 0 No
3244 * 1 Yes
3245 *
3246 * Locks: Assumes proc_fdlock for process is held by the caller
3247 *
3248 * Notes: The answer only remains valid so long as the proc_fdlock is
3249 * held by the caller.
3250 */
3251 int
3252 fdavail(proc_t p, int n)
3253 {
3254 struct filedesc *fdp = p->p_fd;
3255 struct fileproc **fpp;
3256 char *flags;
3257 int i, lim;
3258
3259 lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
3260 if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0)
3261 return (1);
3262 fpp = &fdp->fd_ofiles[fdp->fd_freefile];
3263 flags = &fdp->fd_ofileflags[fdp->fd_freefile];
3264 for (i = fdp->fd_nfiles - fdp->fd_freefile; --i >= 0; fpp++, flags++)
3265 if (*fpp == NULL && !(*flags & UF_RESERVED) && --n <= 0)
3266 return (1);
3267 return (0);
3268 }
3269
3270
3271 /*
3272 * fdrelse
3273 *
3274 * Description: Legacy KPI wrapper function for _fdrelse
3275 *
3276 * Parameters: p Process in which fd lives
3277 * fd fd to free
3278 *
3279 * Returns: void
3280 *
3281 * Locks: Assumes proc_fdlock for process is held by the caller
3282 */
3283 void
3284 fdrelse(proc_t p, int fd)
3285 {
3286 _fdrelse(p, fd);
3287 }
3288
3289
3290 /*
3291 * fdgetf_noref
3292 *
3293 * Description: Get the fileproc pointer for the given fd from the per process
3294 * open file table without taking an explicit reference on it.
3295 *
3296 * Parameters: p Process containing fd
3297 * fd fd to obtain fileproc for
3298 * resultfp Pointer to pointer return area
3299 *
3300 * Returns: 0 Success
3301 * EBADF
3302 *
3303 * Implicit returns:
3304 * *resultfp (modified) Pointer to fileproc pointer
3305 *
3306 * Locks: Assumes proc_fdlock for process is held by the caller
3307 *
3308 * Notes: Because there is no reference explicitly taken, the returned
3309 * fileproc pointer is only valid so long as the proc_fdlock
3310 * remains held by the caller.
3311 */
3312 int
3313 fdgetf_noref(proc_t p, int fd, struct fileproc **resultfp)
3314 {
3315 struct filedesc *fdp = p->p_fd;
3316 struct fileproc *fp;
3317
3318 if (fd < 0 || fd >= fdp->fd_nfiles ||
3319 (fp = fdp->fd_ofiles[fd]) == NULL ||
3320 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3321 return (EBADF);
3322 }
3323 if (resultfp)
3324 *resultfp = fp;
3325 return (0);
3326 }
3327
3328
3329 /*
3330 * fp_getfvp
3331 *
3332 * Description: Get fileproc and vnode pointer for a given fd from the per
3333 * process open file table of the specified process, and if
3334 * successful, increment the f_iocount
3335 *
3336 * Parameters: p Process in which fd lives
3337 * fd fd to get information for
3338 * resultfp Pointer to result fileproc
3339 * pointer area, or 0 if none
3340 * resultvp Pointer to result vnode pointer
3341 * area, or 0 if none
3342 *
3343 * Returns: 0 Success
3344 * EBADF Bad file descriptor
3345 * ENOTSUP fd does not refer to a vnode
3346 *
3347 * Implicit returns:
3348 * *resultfp (modified) Fileproc pointer
3349 * *resultvp (modified) vnode pointer
3350 *
3351 * Notes: The resultfp and resultvp fields are optional, and may be
3352 * independently specified as NULL to skip returning information
3353 *
3354 * Locks: Internally takes and releases proc_fdlock
3355 */
3356 int
3357 fp_getfvp(proc_t p, int fd, struct fileproc **resultfp, struct vnode **resultvp)
3358 {
3359 struct filedesc *fdp = p->p_fd;
3360 struct fileproc *fp;
3361
3362 proc_fdlock_spin(p);
3363 if (fd < 0 || fd >= fdp->fd_nfiles ||
3364 (fp = fdp->fd_ofiles[fd]) == NULL ||
3365 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3366 proc_fdunlock(p);
3367 return (EBADF);
3368 }
3369 if (fp->f_type != DTYPE_VNODE) {
3370 proc_fdunlock(p);
3371 return(ENOTSUP);
3372 }
3373 fp->f_iocount++;
3374
3375 if (resultfp)
3376 *resultfp = fp;
3377 if (resultvp)
3378 *resultvp = (struct vnode *)fp->f_data;
3379 proc_fdunlock(p);
3380
3381 return (0);
3382 }
3383
3384
3385 /*
3386 * fp_getfvpandvid
3387 *
3388 * Description: Get fileproc, vnode pointer, and vid for a given fd from the
3389 * per process open file table of the specified process, and if
3390 * successful, increment the f_iocount
3391 *
3392 * Parameters: p Process in which fd lives
3393 * fd fd to get information for
3394 * resultfp Pointer to result fileproc
3395 * pointer area, or 0 if none
3396 * resultvp Pointer to result vnode pointer
3397 * area, or 0 if none
3398 * vidp Pointer to resuld vid area
3399 *
3400 * Returns: 0 Success
3401 * EBADF Bad file descriptor
3402 * ENOTSUP fd does not refer to a vnode
3403 *
3404 * Implicit returns:
3405 * *resultfp (modified) Fileproc pointer
3406 * *resultvp (modified) vnode pointer
3407 * *vidp vid value
3408 *
3409 * Notes: The resultfp and resultvp fields are optional, and may be
3410 * independently specified as NULL to skip returning information
3411 *
3412 * Locks: Internally takes and releases proc_fdlock
3413 */
3414 int
3415 fp_getfvpandvid(proc_t p, int fd, struct fileproc **resultfp,
3416 struct vnode **resultvp, uint32_t *vidp)
3417 {
3418 struct filedesc *fdp = p->p_fd;
3419 struct fileproc *fp;
3420
3421 proc_fdlock_spin(p);
3422 if (fd < 0 || fd >= fdp->fd_nfiles ||
3423 (fp = fdp->fd_ofiles[fd]) == NULL ||
3424 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3425 proc_fdunlock(p);
3426 return (EBADF);
3427 }
3428 if (fp->f_type != DTYPE_VNODE) {
3429 proc_fdunlock(p);
3430 return(ENOTSUP);
3431 }
3432 fp->f_iocount++;
3433
3434 if (resultfp)
3435 *resultfp = fp;
3436 if (resultvp)
3437 *resultvp = (struct vnode *)fp->f_data;
3438 if (vidp)
3439 *vidp = (uint32_t)vnode_vid((struct vnode *)fp->f_data);
3440 proc_fdunlock(p);
3441
3442 return (0);
3443 }
3444
3445
3446 /*
3447 * fp_getfsock
3448 *
3449 * Description: Get fileproc and socket pointer for a given fd from the
3450 * per process open file table of the specified process, and if
3451 * successful, increment the f_iocount
3452 *
3453 * Parameters: p Process in which fd lives
3454 * fd fd to get information for
3455 * resultfp Pointer to result fileproc
3456 * pointer area, or 0 if none
3457 * results Pointer to result socket
3458 * pointer area, or 0 if none
3459 *
3460 * Returns: EBADF The file descriptor is invalid
3461 * EOPNOTSUPP The file descriptor is not a socket
3462 * 0 Success
3463 *
3464 * Implicit returns:
3465 * *resultfp (modified) Fileproc pointer
3466 * *results (modified) socket pointer
3467 *
3468 * Notes: EOPNOTSUPP should probably be ENOTSOCK; this function is only
3469 * ever called from accept1().
3470 */
3471 int
3472 fp_getfsock(proc_t p, int fd, struct fileproc **resultfp,
3473 struct socket **results)
3474 {
3475 struct filedesc *fdp = p->p_fd;
3476 struct fileproc *fp;
3477
3478 proc_fdlock_spin(p);
3479 if (fd < 0 || fd >= fdp->fd_nfiles ||
3480 (fp = fdp->fd_ofiles[fd]) == NULL ||
3481 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3482 proc_fdunlock(p);
3483 return (EBADF);
3484 }
3485 if (fp->f_type != DTYPE_SOCKET) {
3486 proc_fdunlock(p);
3487 return(EOPNOTSUPP);
3488 }
3489 fp->f_iocount++;
3490
3491 if (resultfp)
3492 *resultfp = fp;
3493 if (results)
3494 *results = (struct socket *)fp->f_data;
3495 proc_fdunlock(p);
3496
3497 return (0);
3498 }
3499
3500
3501 /*
3502 * fp_getfkq
3503 *
3504 * Description: Get fileproc and kqueue pointer for a given fd from the
3505 * per process open file table of the specified process, and if
3506 * successful, increment the f_iocount
3507 *
3508 * Parameters: p Process in which fd lives
3509 * fd fd to get information for
3510 * resultfp Pointer to result fileproc
3511 * pointer area, or 0 if none
3512 * resultkq Pointer to result kqueue
3513 * pointer area, or 0 if none
3514 *
3515 * Returns: EBADF The file descriptor is invalid
3516 * EBADF The file descriptor is not a socket
3517 * 0 Success
3518 *
3519 * Implicit returns:
3520 * *resultfp (modified) Fileproc pointer
3521 * *resultkq (modified) kqueue pointer
3522 *
3523 * Notes: The second EBADF should probably be something else to make
3524 * the error condition distinct.
3525 */
3526 int
3527 fp_getfkq(proc_t p, int fd, struct fileproc **resultfp,
3528 struct kqueue **resultkq)
3529 {
3530 struct filedesc *fdp = p->p_fd;
3531 struct fileproc *fp;
3532
3533 proc_fdlock_spin(p);
3534 if ( fd < 0 || fd >= fdp->fd_nfiles ||
3535 (fp = fdp->fd_ofiles[fd]) == NULL ||
3536 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3537 proc_fdunlock(p);
3538 return (EBADF);
3539 }
3540 if (fp->f_type != DTYPE_KQUEUE) {
3541 proc_fdunlock(p);
3542 return(EBADF);
3543 }
3544 fp->f_iocount++;
3545
3546 if (resultfp)
3547 *resultfp = fp;
3548 if (resultkq)
3549 *resultkq = (struct kqueue *)fp->f_data;
3550 proc_fdunlock(p);
3551
3552 return (0);
3553 }
3554
3555
3556 /*
3557 * fp_getfpshm
3558 *
3559 * Description: Get fileproc and POSIX shared memory pointer for a given fd
3560 * from the per process open file table of the specified process
3561 * and if successful, increment the f_iocount
3562 *
3563 * Parameters: p Process in which fd lives
3564 * fd fd to get information for
3565 * resultfp Pointer to result fileproc
3566 * pointer area, or 0 if none
3567 * resultpshm Pointer to result POSIX
3568 * shared memory pointer
3569 * pointer area, or 0 if none
3570 *
3571 * Returns: EBADF The file descriptor is invalid
3572 * EBADF The file descriptor is not a POSIX
3573 * shared memory area
3574 * 0 Success
3575 *
3576 * Implicit returns:
3577 * *resultfp (modified) Fileproc pointer
3578 * *resultpshm (modified) POSIX shared memory pointer
3579 *
3580 * Notes: The second EBADF should probably be something else to make
3581 * the error condition distinct.
3582 */
3583 int
3584 fp_getfpshm(proc_t p, int fd, struct fileproc **resultfp,
3585 struct pshmnode **resultpshm)
3586 {
3587 struct filedesc *fdp = p->p_fd;
3588 struct fileproc *fp;
3589
3590 proc_fdlock_spin(p);
3591 if (fd < 0 || fd >= fdp->fd_nfiles ||
3592 (fp = fdp->fd_ofiles[fd]) == NULL ||
3593 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3594 proc_fdunlock(p);
3595 return (EBADF);
3596 }
3597 if (fp->f_type != DTYPE_PSXSHM) {
3598
3599 proc_fdunlock(p);
3600 return(EBADF);
3601 }
3602 fp->f_iocount++;
3603
3604 if (resultfp)
3605 *resultfp = fp;
3606 if (resultpshm)
3607 *resultpshm = (struct pshmnode *)fp->f_data;
3608 proc_fdunlock(p);
3609
3610 return (0);
3611 }
3612
3613
3614 /*
3615 * fp_getfsem
3616 *
3617 * Description: Get fileproc and POSIX semaphore pointer for a given fd from
3618 * the per process open file table of the specified process
3619 * and if successful, increment the f_iocount
3620 *
3621 * Parameters: p Process in which fd lives
3622 * fd fd to get information for
3623 * resultfp Pointer to result fileproc
3624 * pointer area, or 0 if none
3625 * resultpsem Pointer to result POSIX
3626 * semaphore pointer area, or
3627 * 0 if none
3628 *
3629 * Returns: EBADF The file descriptor is invalid
3630 * EBADF The file descriptor is not a POSIX
3631 * semaphore
3632 * 0 Success
3633 *
3634 * Implicit returns:
3635 * *resultfp (modified) Fileproc pointer
3636 * *resultpsem (modified) POSIX semaphore pointer
3637 *
3638 * Notes: The second EBADF should probably be something else to make
3639 * the error condition distinct.
3640 *
3641 * In order to support unnamed POSIX semaphores, the named
3642 * POSIX semaphores will have to move out of the per-process
3643 * open filetable, and into a global table that is shared with
3644 * unnamed POSIX semaphores, since unnamed POSIX semaphores
3645 * are typically used by declaring instances in shared memory,
3646 * and there's no other way to do this without changing the
3647 * underlying type, which would introduce binary compatibility
3648 * issues.
3649 */
3650 int
3651 fp_getfpsem(proc_t p, int fd, struct fileproc **resultfp,
3652 struct psemnode **resultpsem)
3653 {
3654 struct filedesc *fdp = p->p_fd;
3655 struct fileproc *fp;
3656
3657 proc_fdlock_spin(p);
3658 if (fd < 0 || fd >= fdp->fd_nfiles ||
3659 (fp = fdp->fd_ofiles[fd]) == NULL ||
3660 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3661 proc_fdunlock(p);
3662 return (EBADF);
3663 }
3664 if (fp->f_type != DTYPE_PSXSEM) {
3665 proc_fdunlock(p);
3666 return(EBADF);
3667 }
3668 fp->f_iocount++;
3669
3670 if (resultfp)
3671 *resultfp = fp;
3672 if (resultpsem)
3673 *resultpsem = (struct psemnode *)fp->f_data;
3674 proc_fdunlock(p);
3675
3676 return (0);
3677 }
3678
3679
3680 /*
3681 * fp_getfpipe
3682 *
3683 * Description: Get fileproc and pipe pointer for a given fd from the
3684 * per process open file table of the specified process
3685 * and if successful, increment the f_iocount
3686 *
3687 * Parameters: p Process in which fd lives
3688 * fd fd to get information for
3689 * resultfp Pointer to result fileproc
3690 * pointer area, or 0 if none
3691 * resultpipe Pointer to result pipe
3692 * pointer area, or 0 if none
3693 *
3694 * Returns: EBADF The file descriptor is invalid
3695 * EBADF The file descriptor is not a socket
3696 * 0 Success
3697 *
3698 * Implicit returns:
3699 * *resultfp (modified) Fileproc pointer
3700 * *resultpipe (modified) pipe pointer
3701 *
3702 * Notes: The second EBADF should probably be something else to make
3703 * the error condition distinct.
3704 */
3705 int
3706 fp_getfpipe(proc_t p, int fd, struct fileproc **resultfp,
3707 struct pipe **resultpipe)
3708 {
3709 struct filedesc *fdp = p->p_fd;
3710 struct fileproc *fp;
3711
3712 proc_fdlock_spin(p);
3713 if (fd < 0 || fd >= fdp->fd_nfiles ||
3714 (fp = fdp->fd_ofiles[fd]) == NULL ||
3715 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3716 proc_fdunlock(p);
3717 return (EBADF);
3718 }
3719 if (fp->f_type != DTYPE_PIPE) {
3720 proc_fdunlock(p);
3721 return(EBADF);
3722 }
3723 fp->f_iocount++;
3724
3725 if (resultfp)
3726 *resultfp = fp;
3727 if (resultpipe)
3728 *resultpipe = (struct pipe *)fp->f_data;
3729 proc_fdunlock(p);
3730
3731 return (0);
3732 }
3733
3734 /*
3735 * fp_lookup
3736 *
3737 * Description: Get fileproc pointer for a given fd from the per process
3738 * open file table of the specified process and if successful,
3739 * increment the f_iocount
3740 *
3741 * Parameters: p Process in which fd lives
3742 * fd fd to get information for
3743 * resultfp Pointer to result fileproc
3744 * pointer area, or 0 if none
3745 * locked !0 if the caller holds the
3746 * proc_fdlock, 0 otherwise
3747 *
3748 * Returns: 0 Success
3749 * EBADF Bad file descriptor
3750 *
3751 * Implicit returns:
3752 * *resultfp (modified) Fileproc pointer
3753 *
3754 * Locks: If the argument 'locked' is non-zero, then the caller is
3755 * expected to have taken and held the proc_fdlock; if it is
3756 * zero, than this routine internally takes and drops this lock.
3757 */
3758 int
3759 fp_lookup(proc_t p, int fd, struct fileproc **resultfp, int locked)
3760 {
3761 struct filedesc *fdp = p->p_fd;
3762 struct fileproc *fp;
3763
3764 if (!locked)
3765 proc_fdlock_spin(p);
3766 if (fd < 0 || fdp == NULL || fd >= fdp->fd_nfiles ||
3767 (fp = fdp->fd_ofiles[fd]) == NULL ||
3768 (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
3769 if (!locked)
3770 proc_fdunlock(p);
3771 return (EBADF);
3772 }
3773 fp->f_iocount++;
3774
3775 if (resultfp)
3776 *resultfp = fp;
3777 if (!locked)
3778 proc_fdunlock(p);
3779
3780 return (0);
3781 }
3782
3783
3784 /*
3785 * fp_tryswap
3786 *
3787 * Description: Swap the fileproc pointer for a given fd with a new
3788 * fileproc pointer in the per-process open file table of
3789 * the specified process. The fdlock must be held at entry.
3790 *
3791 * Parameters: p Process containing the fd
3792 * fd The fd of interest
3793 * nfp Pointer to the newfp
3794 *
3795 * Returns: 0 Success
3796 * EBADF Bad file descriptor
3797 * EINTR Interrupted
3798 * EKEEPLOOKING f_iocount changed while lock was dropped.
3799 */
3800 int
3801 fp_tryswap(proc_t p, int fd, struct fileproc *nfp)
3802 {
3803 struct fileproc *fp;
3804 int error;
3805
3806 proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
3807
3808 if (0 != (error = fp_lookup(p, fd, &fp, 1)))
3809 return (error);
3810 /*
3811 * At this point, our caller (change_guardedfd_np) has
3812 * one f_iocount reference, and we just took another
3813 * one to begin the replacement.
3814 */
3815 if (fp->f_iocount < 2) {
3816 panic("f_iocount too small %d", fp->f_iocount);
3817 } else if (2 == fp->f_iocount) {
3818
3819 /* Copy the contents of *fp, preserving the "type" of *nfp */
3820
3821 nfp->f_flags = (nfp->f_flags & FP_TYPEMASK) |
3822 (fp->f_flags & ~FP_TYPEMASK);
3823 nfp->f_iocount = fp->f_iocount;
3824 nfp->f_fglob = fp->f_fglob;
3825 nfp->f_waddr = fp->f_waddr;
3826
3827 p->p_fd->fd_ofiles[fd] = nfp;
3828 (void) fp_drop(p, fd, nfp, 1);
3829 } else {
3830 /*
3831 * Wait for all other active references to evaporate.
3832 */
3833 p->p_fpdrainwait = 1;
3834 error = msleep(&p->p_fpdrainwait, &p->p_fdmlock,
3835 PRIBIO | PCATCH, "tryswap fpdrain", NULL);
3836 if (0 == error) {
3837 /*
3838 * Return an "internal" errno to trigger a full
3839 * reevaluation of the change-guard attempt.
3840 */
3841 error = EKEEPLOOKING;
3842 printf("%s: lookup collision fd %d\n", __func__, fd);
3843 }
3844 (void) fp_drop(p, fd, fp, 1);
3845 }
3846 return (error);
3847 }
3848
3849
3850 /*
3851 * fp_drop_written
3852 *
3853 * Description: Set the FP_WRITTEN flag on the fileproc and drop the I/O
3854 * reference previously taken by calling fp_lookup et. al.
3855 *
3856 * Parameters: p Process in which the fd lives
3857 * fd fd associated with the fileproc
3858 * fp fileproc on which to set the
3859 * flag and drop the reference
3860 *
3861 * Returns: 0 Success
3862 * fp_drop:EBADF Bad file descriptor
3863 *
3864 * Locks: This function internally takes and drops the proc_fdlock for
3865 * the supplied process
3866 *
3867 * Notes: The fileproc must correspond to the fd in the supplied proc
3868 */
3869 int
3870 fp_drop_written(proc_t p, int fd, struct fileproc *fp)
3871 {
3872 int error;
3873
3874 proc_fdlock_spin(p);
3875
3876 fp->f_flags |= FP_WRITTEN;
3877
3878 error = fp_drop(p, fd, fp, 1);
3879
3880 proc_fdunlock(p);
3881
3882 return (error);
3883 }
3884
3885
3886 /*
3887 * fp_drop_event
3888 *
3889 * Description: Set the FP_WAITEVENT flag on the fileproc and drop the I/O
3890 * reference previously taken by calling fp_lookup et. al.
3891 *
3892 * Parameters: p Process in which the fd lives
3893 * fd fd associated with the fileproc
3894 * fp fileproc on which to set the
3895 * flag and drop the reference
3896 *
3897 * Returns: 0 Success
3898 * fp_drop:EBADF Bad file descriptor
3899 *
3900 * Locks: This function internally takes and drops the proc_fdlock for
3901 * the supplied process
3902 *
3903 * Notes: The fileproc must correspond to the fd in the supplied proc
3904 */
3905 int
3906 fp_drop_event(proc_t p, int fd, struct fileproc *fp)
3907 {
3908 int error;
3909
3910 proc_fdlock_spin(p);
3911
3912 fp->f_flags |= FP_WAITEVENT;
3913
3914 error = fp_drop(p, fd, fp, 1);
3915
3916 proc_fdunlock(p);
3917
3918 return (error);
3919 }
3920
3921
3922 /*
3923 * fp_drop
3924 *
3925 * Description: Drop the I/O reference previously taken by calling fp_lookup
3926 * et. al.
3927 *
3928 * Parameters: p Process in which the fd lives
3929 * fd fd associated with the fileproc
3930 * fp fileproc on which to set the
3931 * flag and drop the reference
3932 * locked flag to internally take and
3933 * drop proc_fdlock if it is not
3934 * already held by the caller
3935 *
3936 * Returns: 0 Success
3937 * EBADF Bad file descriptor
3938 *
3939 * Locks: This function internally takes and drops the proc_fdlock for
3940 * the supplied process if 'locked' is non-zero, and assumes that
3941 * the caller already holds this lock if 'locked' is non-zero.
3942 *
3943 * Notes: The fileproc must correspond to the fd in the supplied proc
3944 */
3945 int
3946 fp_drop(proc_t p, int fd, struct fileproc *fp, int locked)
3947 {
3948 struct filedesc *fdp = p->p_fd;
3949 int needwakeup = 0;
3950
3951 if (!locked)
3952 proc_fdlock_spin(p);
3953 if ((fp == FILEPROC_NULL) && (fd < 0 || fd >= fdp->fd_nfiles ||
3954 (fp = fdp->fd_ofiles[fd]) == NULL ||
3955 ((fdp->fd_ofileflags[fd] & UF_RESERVED) &&
3956 !(fdp->fd_ofileflags[fd] & UF_CLOSING)))) {
3957 if (!locked)
3958 proc_fdunlock(p);
3959 return (EBADF);
3960 }
3961 fp->f_iocount--;
3962
3963 if (fp->f_iocount == 0) {
3964 if (fp->f_flags & FP_SELCONFLICT)
3965 fp->f_flags &= ~FP_SELCONFLICT;
3966
3967 if (p->p_fpdrainwait) {
3968 p->p_fpdrainwait = 0;
3969 needwakeup = 1;
3970 }
3971 }
3972 if (!locked)
3973 proc_fdunlock(p);
3974 if (needwakeup)
3975 wakeup(&p->p_fpdrainwait);
3976
3977 return (0);
3978 }
3979
3980
3981 /*
3982 * file_vnode
3983 *
3984 * Description: Given an fd, look it up in the current process's per process
3985 * open file table, and return its internal vnode pointer.
3986 *
3987 * Parameters: fd fd to obtain vnode from
3988 * vpp pointer to vnode return area
3989 *
3990 * Returns: 0 Success
3991 * EINVAL The fd does not refer to a
3992 * vnode fileproc entry
3993 * fp_lookup:EBADF Bad file descriptor
3994 *
3995 * Implicit returns:
3996 * *vpp (modified) Returned vnode pointer
3997 *
3998 * Locks: This function internally takes and drops the proc_fdlock for
3999 * the current process
4000 *
4001 * Notes: If successful, this function increments the f_iocount on the
4002 * fd's corresponding fileproc.
4003 *
4004 * The fileproc referenced is not returned; because of this, care
4005 * must be taken to not drop the last reference (e.g. by closing
4006 * the file). This is inherently unsafe, since the reference may
4007 * not be recoverable from the vnode, if there is a subsequent
4008 * close that destroys the associate fileproc. The caller should
4009 * therefore retain their own reference on the fileproc so that
4010 * the f_iocount can be dropped subsequently. Failure to do this
4011 * can result in the returned pointer immediately becoming invalid
4012 * following the call.
4013 *
4014 * Use of this function is discouraged.
4015 */
4016 int
4017 file_vnode(int fd, struct vnode **vpp)
4018 {
4019 proc_t p = current_proc();
4020 struct fileproc *fp;
4021 int error;
4022
4023 proc_fdlock_spin(p);
4024 if ( (error = fp_lookup(p, fd, &fp, 1)) ) {
4025 proc_fdunlock(p);
4026 return(error);
4027 }
4028 if (fp->f_type != DTYPE_VNODE) {
4029 fp_drop(p, fd, fp,1);
4030 proc_fdunlock(p);
4031 return(EINVAL);
4032 }
4033 if (vpp != NULL)
4034 *vpp = (struct vnode *)fp->f_data;
4035 proc_fdunlock(p);
4036
4037 return(0);
4038 }
4039
4040
4041 /*
4042 * file_vnode_withvid
4043 *
4044 * Description: Given an fd, look it up in the current process's per process
4045 * open file table, and return its internal vnode pointer.
4046 *
4047 * Parameters: fd fd to obtain vnode from
4048 * vpp pointer to vnode return area
4049 * vidp pointer to vid of the returned vnode
4050 *
4051 * Returns: 0 Success
4052 * EINVAL The fd does not refer to a
4053 * vnode fileproc entry
4054 * fp_lookup:EBADF Bad file descriptor
4055 *
4056 * Implicit returns:
4057 * *vpp (modified) Returned vnode pointer
4058 *
4059 * Locks: This function internally takes and drops the proc_fdlock for
4060 * the current process
4061 *
4062 * Notes: If successful, this function increments the f_iocount on the
4063 * fd's corresponding fileproc.
4064 *
4065 * The fileproc referenced is not returned; because of this, care
4066 * must be taken to not drop the last reference (e.g. by closing
4067 * the file). This is inherently unsafe, since the reference may
4068 * not be recoverable from the vnode, if there is a subsequent
4069 * close that destroys the associate fileproc. The caller should
4070 * therefore retain their own reference on the fileproc so that
4071 * the f_iocount can be dropped subsequently. Failure to do this
4072 * can result in the returned pointer immediately becoming invalid
4073 * following the call.
4074 *
4075 * Use of this function is discouraged.
4076 */
4077 int
4078 file_vnode_withvid(int fd, struct vnode **vpp, uint32_t * vidp)
4079 {
4080 proc_t p = current_proc();
4081 struct fileproc *fp;
4082 vnode_t vp;
4083 int error;
4084
4085 proc_fdlock_spin(p);
4086 if ( (error = fp_lookup(p, fd, &fp, 1)) ) {
4087 proc_fdunlock(p);
4088 return(error);
4089 }
4090 if (fp->f_type != DTYPE_VNODE) {
4091 fp_drop(p, fd, fp,1);
4092 proc_fdunlock(p);
4093 return(EINVAL);
4094 }
4095 vp = (struct vnode *)fp->f_data;
4096 if (vpp != NULL)
4097 *vpp = vp;
4098
4099 if ((vidp != NULL) && (vp != NULLVP))
4100 *vidp = (uint32_t)vp->v_id;
4101
4102 proc_fdunlock(p);
4103
4104 return(0);
4105 }
4106
4107
4108 /*
4109 * file_socket
4110 *
4111 * Description: Given an fd, look it up in the current process's per process
4112 * open file table, and return its internal socket pointer.
4113 *
4114 * Parameters: fd fd to obtain vnode from
4115 * sp pointer to socket return area
4116 *
4117 * Returns: 0 Success
4118 * ENOTSOCK Not a socket
4119 * fp_lookup:EBADF Bad file descriptor
4120 *
4121 * Implicit returns:
4122 * *sp (modified) Returned socket pointer
4123 *
4124 * Locks: This function internally takes and drops the proc_fdlock for
4125 * the current process
4126 *
4127 * Notes: If successful, this function increments the f_iocount on the
4128 * fd's corresponding fileproc.
4129 *
4130 * The fileproc referenced is not returned; because of this, care
4131 * must be taken to not drop the last reference (e.g. by closing
4132 * the file). This is inherently unsafe, since the reference may
4133 * not be recoverable from the socket, if there is a subsequent
4134 * close that destroys the associate fileproc. The caller should
4135 * therefore retain their own reference on the fileproc so that
4136 * the f_iocount can be dropped subsequently. Failure to do this
4137 * can result in the returned pointer immediately becoming invalid
4138 * following the call.
4139 *
4140 * Use of this function is discouraged.
4141 */
4142 int
4143 file_socket(int fd, struct socket **sp)
4144 {
4145 proc_t p = current_proc();
4146 struct fileproc *fp;
4147 int error;
4148
4149 proc_fdlock_spin(p);
4150 if ( (error = fp_lookup(p, fd, &fp, 1)) ) {
4151 proc_fdunlock(p);
4152 return(error);
4153 }
4154 if (fp->f_type != DTYPE_SOCKET) {
4155 fp_drop(p, fd, fp,1);
4156 proc_fdunlock(p);
4157 return(ENOTSOCK);
4158 }
4159 *sp = (struct socket *)fp->f_data;
4160 proc_fdunlock(p);
4161
4162 return(0);
4163 }
4164
4165
4166 /*
4167 * file_flags
4168 *
4169 * Description: Given an fd, look it up in the current process's per process
4170 * open file table, and return its fileproc's flags field.
4171 *
4172 * Parameters: fd fd whose flags are to be
4173 * retrieved
4174 * flags pointer to flags data area
4175 *
4176 * Returns: 0 Success
4177 * ENOTSOCK Not a socket
4178 * fp_lookup:EBADF Bad file descriptor
4179 *
4180 * Implicit returns:
4181 * *flags (modified) Returned flags field
4182 *
4183 * Locks: This function internally takes and drops the proc_fdlock for
4184 * the current process
4185 *
4186 * Notes: This function will internally increment and decrement the
4187 * f_iocount of the fileproc as part of its operation.
4188 */
4189 int
4190 file_flags(int fd, int *flags)
4191 {
4192
4193 proc_t p = current_proc();
4194 struct fileproc *fp;
4195 int error;
4196
4197 proc_fdlock_spin(p);
4198 if ( (error = fp_lookup(p, fd, &fp, 1)) ) {
4199 proc_fdunlock(p);
4200 return(error);
4201 }
4202 *flags = (int)fp->f_flag;
4203 fp_drop(p, fd, fp,1);
4204 proc_fdunlock(p);
4205
4206 return(0);
4207 }
4208
4209
4210 /*
4211 * file_drop
4212 *
4213 * Description: Drop an iocount reference on an fd, and wake up any waiters
4214 * for draining (i.e. blocked in fileproc_drain() called during
4215 * the last attempt to close a file).
4216 *
4217 * Parameters: fd fd on which an ioreference is
4218 * to be dropped
4219 *
4220 * Returns: 0 Success
4221 * EBADF Bad file descriptor
4222 *
4223 * Description: Given an fd, look it up in the current process's per process
4224 * open file table, and drop it's fileproc's f_iocount by one
4225 *
4226 * Notes: This is intended as a corresponding operation to the functions
4227 * file_vnode() and file_socket() operations.
4228 *
4229 * Technically, the close reference is supposed to be protected
4230 * by a fileproc_drain(), however, a drain will only block if
4231 * the fd refers to a character device, and that device has had
4232 * preparefileread() called on it. If it refers to something
4233 * other than a character device, then the drain will occur and
4234 * block each close attempt, rather than merely the last close.
4235 *
4236 * Since it's possible for an fd that refers to a character
4237 * device to have an intermediate close followed by an open to
4238 * cause a different file to correspond to that descriptor,
4239 * unless there was a cautionary reference taken on the fileproc,
4240 * this is an inherently unsafe function. This happens in the
4241 * case where multiple fd's in a process refer to the same
4242 * character device (e.g. stdin/out/err pointing to a tty, etc.).
4243 *
4244 * Use of this function is discouraged.
4245 */
4246 int
4247 file_drop(int fd)
4248 {
4249 struct fileproc *fp;
4250 proc_t p = current_proc();
4251 int needwakeup = 0;
4252
4253 proc_fdlock_spin(p);
4254 if (fd < 0 || fd >= p->p_fd->fd_nfiles ||
4255 (fp = p->p_fd->fd_ofiles[fd]) == NULL ||
4256 ((p->p_fd->fd_ofileflags[fd] & UF_RESERVED) &&
4257 !(p->p_fd->fd_ofileflags[fd] & UF_CLOSING))) {
4258 proc_fdunlock(p);
4259 return (EBADF);
4260 }
4261 fp->f_iocount --;
4262
4263 if (fp->f_iocount == 0) {
4264 if (fp->f_flags & FP_SELCONFLICT)
4265 fp->f_flags &= ~FP_SELCONFLICT;
4266
4267 if (p->p_fpdrainwait) {
4268 p->p_fpdrainwait = 0;
4269 needwakeup = 1;
4270 }
4271 }
4272 proc_fdunlock(p);
4273
4274 if (needwakeup)
4275 wakeup(&p->p_fpdrainwait);
4276 return(0);
4277 }
4278
4279
4280 static int falloc_withalloc_locked(proc_t, struct fileproc **, int *,
4281 vfs_context_t, struct fileproc * (*)(void *), void *, int);
4282
4283 /*
4284 * falloc
4285 *
4286 * Description: Allocate an entry in the per process open file table and
4287 * return the corresponding fileproc and fd.
4288 *
4289 * Parameters: p The process in whose open file
4290 * table the fd is to be allocated
4291 * resultfp Pointer to fileproc pointer
4292 * return area
4293 * resultfd Pointer to fd return area
4294 * ctx VFS context
4295 *
4296 * Returns: 0 Success
4297 * falloc:ENFILE Too many open files in system
4298 * falloc:EMFILE Too many open files in process
4299 * falloc:ENOMEM M_FILEPROC or M_FILEGLOB zone
4300 * exhausted
4301 *
4302 * Implicit returns:
4303 * *resultfd (modified) Returned fileproc pointer
4304 * *resultfd (modified) Returned fd
4305 *
4306 * Locks: This function takes and drops the proc_fdlock; if this lock
4307 * is already held, use falloc_locked() instead.
4308 *
4309 * Notes: This function takes separate process and context arguments
4310 * solely to support kern_exec.c; otherwise, it would take
4311 * neither, and expect falloc_locked() to use the
4312 * vfs_context_current() routine internally.
4313 */
4314 int
4315 falloc(proc_t p, struct fileproc **resultfp, int *resultfd, vfs_context_t ctx)
4316 {
4317 return (falloc_withalloc(p, resultfp, resultfd, ctx,
4318 fileproc_alloc_init, NULL));
4319 }
4320
4321 /*
4322 * Like falloc, but including the fileproc allocator and create-args
4323 */
4324 int
4325 falloc_withalloc(proc_t p, struct fileproc **resultfp, int *resultfd,
4326 vfs_context_t ctx, fp_allocfn_t fp_zalloc, void *arg)
4327 {
4328 int error;
4329
4330 proc_fdlock(p);
4331 error = falloc_withalloc_locked(p,
4332 resultfp, resultfd, ctx, fp_zalloc, arg, 1);
4333 proc_fdunlock(p);
4334
4335 return (error);
4336 }
4337
4338 /*
4339 * "uninitialized" ops -- ensure fg->fg_ops->fo_type always exists
4340 */
4341 static const struct fileops uninitops;
4342
4343 /*
4344 * falloc_locked
4345 *
4346 * Create a new open file structure and allocate
4347 * a file descriptor for the process that refers to it.
4348 *
4349 * Returns: 0 Success
4350 *
4351 * Description: Allocate an entry in the per process open file table and
4352 * return the corresponding fileproc and fd.
4353 *
4354 * Parameters: p The process in whose open file
4355 * table the fd is to be allocated
4356 * resultfp Pointer to fileproc pointer
4357 * return area
4358 * resultfd Pointer to fd return area
4359 * ctx VFS context
4360 * locked Flag to indicate whether the
4361 * caller holds proc_fdlock
4362 *
4363 * Returns: 0 Success
4364 * ENFILE Too many open files in system
4365 * fdalloc:EMFILE Too many open files in process
4366 * ENOMEM M_FILEPROC or M_FILEGLOB zone
4367 * exhausted
4368 * fdalloc:ENOMEM
4369 *
4370 * Implicit returns:
4371 * *resultfd (modified) Returned fileproc pointer
4372 * *resultfd (modified) Returned fd
4373 *
4374 * Locks: If the parameter 'locked' is zero, this function takes and
4375 * drops the proc_fdlock; if non-zero, the caller must hold the
4376 * lock.
4377 *
4378 * Notes: If you intend to use a non-zero 'locked' parameter, use the
4379 * utility function falloc() instead.
4380 *
4381 * This function takes separate process and context arguments
4382 * solely to support kern_exec.c; otherwise, it would take
4383 * neither, and use the vfs_context_current() routine internally.
4384 */
4385 int
4386 falloc_locked(proc_t p, struct fileproc **resultfp, int *resultfd,
4387 vfs_context_t ctx, int locked)
4388 {
4389 return (falloc_withalloc_locked(p, resultfp, resultfd, ctx,
4390 fileproc_alloc_init, NULL, locked));
4391 }
4392
4393 static int
4394 falloc_withalloc_locked(proc_t p, struct fileproc **resultfp, int *resultfd,
4395 vfs_context_t ctx, fp_allocfn_t fp_zalloc, void *crarg,
4396 int locked)
4397 {
4398 struct fileproc *fp;
4399 struct fileglob *fg;
4400 int error, nfd;
4401
4402 if (!locked)
4403 proc_fdlock(p);
4404 if ( (error = fdalloc(p, 0, &nfd)) ) {
4405 if (!locked)
4406 proc_fdunlock(p);
4407 return (error);
4408 }
4409 if (nfiles >= maxfiles) {
4410 if (!locked)
4411 proc_fdunlock(p);
4412 tablefull("file");
4413 return (ENFILE);
4414 }
4415 #if CONFIG_MACF
4416 error = mac_file_check_create(proc_ucred(p));
4417 if (error) {
4418 if (!locked)
4419 proc_fdunlock(p);
4420 return (error);
4421 }
4422 #endif
4423
4424 /*
4425 * Allocate a new file descriptor.
4426 * If the process has file descriptor zero open, add to the list
4427 * of open files at that point, otherwise put it at the front of
4428 * the list of open files.
4429 */
4430 proc_fdunlock(p);
4431
4432 fp = (*fp_zalloc)(crarg);
4433 if (fp == NULL) {
4434 if (locked)
4435 proc_fdlock(p);
4436 return (ENOMEM);
4437 }
4438 MALLOC_ZONE(fg, struct fileglob *, sizeof(struct fileglob), M_FILEGLOB, M_WAITOK);
4439 if (fg == NULL) {
4440 fileproc_free(fp);
4441 if (locked)
4442 proc_fdlock(p);
4443 return (ENOMEM);
4444 }
4445 bzero(fg, sizeof(struct fileglob));
4446 lck_mtx_init(&fg->fg_lock, file_lck_grp, file_lck_attr);
4447
4448 fp->f_iocount = 1;
4449 fg->fg_count = 1;
4450 fg->fg_ops = &uninitops;
4451 fp->f_fglob = fg;
4452 #if CONFIG_MACF
4453 mac_file_label_init(fg);
4454 #endif
4455
4456 kauth_cred_ref(ctx->vc_ucred);
4457
4458 proc_fdlock(p);
4459
4460 fp->f_cred = ctx->vc_ucred;
4461
4462 #if CONFIG_MACF
4463 mac_file_label_associate(fp->f_cred, fg);
4464 #endif
4465
4466 OSAddAtomic(1, &nfiles);
4467
4468 p->p_fd->fd_ofiles[nfd] = fp;
4469
4470 if (!locked)
4471 proc_fdunlock(p);
4472
4473 if (resultfp)
4474 *resultfp = fp;
4475 if (resultfd)
4476 *resultfd = nfd;
4477
4478 return (0);
4479 }
4480
4481
4482 /*
4483 * fg_free
4484 *
4485 * Description: Free a file structure; drop the global open file count, and
4486 * drop the credential reference, if the fileglob has one, and
4487 * destroy the instance mutex before freeing
4488 *
4489 * Parameters: fg Pointer to fileglob to be
4490 * freed
4491 *
4492 * Returns: void
4493 */
4494 void
4495 fg_free(struct fileglob *fg)
4496 {
4497 OSAddAtomic(-1, &nfiles);
4498
4499 if (fg->fg_vn_data) {
4500 fg_vn_data_free(fg->fg_vn_data);
4501 fg->fg_vn_data = NULL;
4502 }
4503
4504 if (IS_VALID_CRED(fg->fg_cred)) {
4505 kauth_cred_unref(&fg->fg_cred);
4506 }
4507 lck_mtx_destroy(&fg->fg_lock, file_lck_grp);
4508
4509 #if CONFIG_MACF
4510 mac_file_label_destroy(fg);
4511 #endif
4512 FREE_ZONE(fg, sizeof *fg, M_FILEGLOB);
4513 }
4514
4515
4516 /*
4517 * fdexec
4518 *
4519 * Description: Perform close-on-exec processing for all files in a process
4520 * that are either marked as close-on-exec, or which were in the
4521 * process of being opened at the time of the execve
4522 *
4523 * Also handles the case (via posix_spawn()) where -all-
4524 * files except those marked with "inherit" as treated as
4525 * close-on-exec.
4526 *
4527 * Parameters: p Pointer to process calling
4528 * execve
4529 *
4530 * Returns: void
4531 *
4532 * Locks: This function internally takes and drops proc_fdlock()
4533 *
4534 */
4535 void
4536 fdexec(proc_t p, short flags)
4537 {
4538 struct filedesc *fdp = p->p_fd;
4539 int i;
4540 boolean_t cloexec_default = (flags & POSIX_SPAWN_CLOEXEC_DEFAULT) != 0;
4541
4542 proc_fdlock(p);
4543 for (i = fdp->fd_lastfile; i >= 0; i--) {
4544
4545 struct fileproc *fp = fdp->fd_ofiles[i];
4546 char *flagp = &fdp->fd_ofileflags[i];
4547
4548 if (fp && cloexec_default) {
4549 /*
4550 * Reverse the usual semantics of file descriptor
4551 * inheritance - all of them should be closed
4552 * except files marked explicitly as "inherit" and
4553 * not marked close-on-exec.
4554 */
4555 if ((*flagp & (UF_EXCLOSE|UF_INHERIT)) != UF_INHERIT)
4556 *flagp |= UF_EXCLOSE;
4557 *flagp &= ~UF_INHERIT;
4558 }
4559
4560 if (
4561 ((*flagp & (UF_RESERVED|UF_EXCLOSE)) == UF_EXCLOSE)
4562 #if CONFIG_MACF
4563 || (fp && mac_file_check_inherit(proc_ucred(p), fp->f_fglob))
4564 #endif
4565 ) {
4566 if (i < fdp->fd_knlistsize)
4567 knote_fdclose(p, i);
4568 procfdtbl_clearfd(p, i);
4569 if (i == fdp->fd_lastfile && i > 0)
4570 fdp->fd_lastfile--;
4571 if (i < fdp->fd_freefile)
4572 fdp->fd_freefile = i;
4573
4574 /*
4575 * Wait for any third party viewers (e.g., lsof)
4576 * to release their references to this fileproc.
4577 */
4578 while (fp->f_iocount > 0) {
4579 p->p_fpdrainwait = 1;
4580 msleep(&p->p_fpdrainwait, &p->p_fdmlock, PRIBIO,
4581 "fpdrain", NULL);
4582 }
4583
4584 closef_locked(fp, fp->f_fglob, p);
4585
4586 fileproc_free(fp);
4587 }
4588 }
4589 proc_fdunlock(p);
4590 }
4591
4592
4593 /*
4594 * fdcopy
4595 *
4596 * Description: Copy a filedesc structure. This is normally used as part of
4597 * forkproc() when forking a new process, to copy the per process
4598 * open file table over to the new process.
4599 *
4600 * Parameters: p Process whose open file table
4601 * is to be copied (parent)
4602 * uth_cdir Per thread current working
4603 * cirectory, or NULL
4604 *
4605 * Returns: NULL Copy failed
4606 * !NULL Pointer to new struct filedesc
4607 *
4608 * Locks: This function internally takes and drops proc_fdlock()
4609 *
4610 * Notes: Files are copied directly, ignoring the new resource limits
4611 * for the process that's being copied into. Since the descriptor
4612 * references are just additional references, this does not count
4613 * against the number of open files on the system.
4614 *
4615 * The struct filedesc includes the current working directory,
4616 * and the current root directory, if the process is chroot'ed.
4617 *
4618 * If the exec was called by a thread using a per thread current
4619 * working directory, we inherit the working directory from the
4620 * thread making the call, rather than from the process.
4621 *
4622 * In the case of a failure to obtain a reference, for most cases,
4623 * the file entry will be silently dropped. There's an exception
4624 * for the case of a chroot dir, since a failure to to obtain a
4625 * reference there would constitute an "escape" from the chroot
4626 * environment, which must not be allowed. In that case, we will
4627 * deny the execve() operation, rather than allowing the escape.
4628 */
4629 struct filedesc *
4630 fdcopy(proc_t p, vnode_t uth_cdir)
4631 {
4632 struct filedesc *newfdp, *fdp = p->p_fd;
4633 int i;
4634 struct fileproc *ofp, *fp;
4635 vnode_t v_dir;
4636
4637 MALLOC_ZONE(newfdp, struct filedesc *,
4638 sizeof(*newfdp), M_FILEDESC, M_WAITOK);
4639 if (newfdp == NULL)
4640 return(NULL);
4641
4642 proc_fdlock(p);
4643
4644 /*
4645 * the FD_CHROOT flag will be inherited via this copy
4646 */
4647 (void) memcpy(newfdp, fdp, sizeof(*newfdp));
4648
4649 /*
4650 * If we are running with per-thread current working directories,
4651 * inherit the new current working directory from the current thread
4652 * instead, before we take our references.
4653 */
4654 if (uth_cdir != NULLVP)
4655 newfdp->fd_cdir = uth_cdir;
4656
4657 /*
4658 * For both fd_cdir and fd_rdir make sure we get
4659 * a valid reference... if we can't, than set
4660 * set the pointer(s) to NULL in the child... this
4661 * will keep us from using a non-referenced vp
4662 * and allows us to do the vnode_rele only on
4663 * a properly referenced vp
4664 */
4665 if ( (v_dir = newfdp->fd_cdir) ) {
4666 if (vnode_getwithref(v_dir) == 0) {
4667 if ( (vnode_ref(v_dir)) )
4668 newfdp->fd_cdir = NULL;
4669 vnode_put(v_dir);
4670 } else
4671 newfdp->fd_cdir = NULL;
4672 }
4673 if (newfdp->fd_cdir == NULL && fdp->fd_cdir) {
4674 /*
4675 * we couldn't get a new reference on
4676 * the current working directory being
4677 * inherited... we might as well drop
4678 * our reference from the parent also
4679 * since the vnode has gone DEAD making
4680 * it useless... by dropping it we'll
4681 * be that much closer to recycling it
4682 */
4683 vnode_rele(fdp->fd_cdir);
4684 fdp->fd_cdir = NULL;
4685 }
4686
4687 if ( (v_dir = newfdp->fd_rdir) ) {
4688 if (vnode_getwithref(v_dir) == 0) {
4689 if ( (vnode_ref(v_dir)) )
4690 newfdp->fd_rdir = NULL;
4691 vnode_put(v_dir);
4692 } else {
4693 newfdp->fd_rdir = NULL;
4694 }
4695 }
4696 /* Coming from a chroot environment and unable to get a reference... */
4697 if (newfdp->fd_rdir == NULL && fdp->fd_rdir) {
4698 /*
4699 * We couldn't get a new reference on
4700 * the chroot directory being
4701 * inherited... this is fatal, since
4702 * otherwise it would constitute an
4703 * escape from a chroot environment by
4704 * the new process.
4705 */
4706 if (newfdp->fd_cdir)
4707 vnode_rele(newfdp->fd_cdir);
4708 FREE_ZONE(newfdp, sizeof *newfdp, M_FILEDESC);
4709 return(NULL);
4710 }
4711
4712 /*
4713 * If the number of open files fits in the internal arrays
4714 * of the open file structure, use them, otherwise allocate
4715 * additional memory for the number of descriptors currently
4716 * in use.
4717 */
4718 if (newfdp->fd_lastfile < NDFILE)
4719 i = NDFILE;
4720 else {
4721 /*
4722 * Compute the smallest multiple of NDEXTENT needed
4723 * for the file descriptors currently in use,
4724 * allowing the table to shrink.
4725 */
4726 i = newfdp->fd_nfiles;
4727 while (i > 2 * NDEXTENT && i > newfdp->fd_lastfile * 2)
4728 i /= 2;
4729 }
4730 proc_fdunlock(p);
4731
4732 MALLOC_ZONE(newfdp->fd_ofiles, struct fileproc **,
4733 i * OFILESIZE, M_OFILETABL, M_WAITOK);
4734 if (newfdp->fd_ofiles == NULL) {
4735 if (newfdp->fd_cdir)
4736 vnode_rele(newfdp->fd_cdir);
4737 if (newfdp->fd_rdir)
4738 vnode_rele(newfdp->fd_rdir);
4739
4740 FREE_ZONE(newfdp, sizeof(*newfdp), M_FILEDESC);
4741 return(NULL);
4742 }
4743 (void) memset(newfdp->fd_ofiles, 0, i * OFILESIZE);
4744 proc_fdlock(p);
4745
4746 newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i];
4747 newfdp->fd_nfiles = i;
4748
4749 if (fdp->fd_nfiles > 0) {
4750 struct fileproc **fpp;
4751 char *flags;
4752
4753 (void) memcpy(newfdp->fd_ofiles, fdp->fd_ofiles,
4754 (newfdp->fd_lastfile + 1) * sizeof(*fdp->fd_ofiles));
4755 (void) memcpy(newfdp->fd_ofileflags, fdp->fd_ofileflags,
4756 (newfdp->fd_lastfile + 1) * sizeof(*fdp->fd_ofileflags));
4757
4758 /*
4759 * kq descriptors cannot be copied.
4760 */
4761 if (newfdp->fd_knlistsize != -1) {
4762 fpp = &newfdp->fd_ofiles[newfdp->fd_lastfile];
4763 flags = &newfdp->fd_ofileflags[newfdp->fd_lastfile];
4764 for (i = newfdp->fd_lastfile;
4765 i >= 0; i--, fpp--, flags--) {
4766 if (*flags & UF_RESERVED)
4767 continue; /* (removed below) */
4768 if (*fpp != NULL && (*fpp)->f_type == DTYPE_KQUEUE) {
4769 *fpp = NULL;
4770 *flags = 0;
4771 if (i < newfdp->fd_freefile)
4772 newfdp->fd_freefile = i;
4773 }
4774 if (*fpp == NULL && i == newfdp->fd_lastfile && i > 0)
4775 newfdp->fd_lastfile--;
4776 }
4777 newfdp->fd_knlist = NULL;
4778 newfdp->fd_knlistsize = -1;
4779 newfdp->fd_knhash = NULL;
4780 newfdp->fd_knhashmask = 0;
4781 }
4782 fpp = newfdp->fd_ofiles;
4783 flags = newfdp->fd_ofileflags;
4784
4785 for (i = newfdp->fd_lastfile + 1; --i >= 0; fpp++, flags++)
4786 if ((ofp = *fpp) != NULL &&
4787 0 == (*flags & (UF_FORKCLOSE|UF_RESERVED))) {
4788 #if DEBUG
4789 if (FILEPROC_TYPE(ofp) != FTYPE_SIMPLE)
4790 panic("complex fileproc");
4791 #endif
4792 fp = fileproc_alloc_init(NULL);
4793 if (fp == NULL) {
4794 /*
4795 * XXX no room to copy, unable to
4796 * XXX safely unwind state at present
4797 */
4798 *fpp = NULL;
4799 } else {
4800 fp->f_flags |=
4801 (ofp->f_flags & ~FP_TYPEMASK);
4802 fp->f_fglob = ofp->f_fglob;
4803 (void)fg_ref(fp);
4804 *fpp = fp;
4805 }
4806 } else {
4807 if (i < newfdp->fd_freefile)
4808 newfdp->fd_freefile = i;
4809 *fpp = NULL;
4810 *flags = 0;
4811 }
4812 }
4813
4814 proc_fdunlock(p);
4815 return (newfdp);
4816 }
4817
4818
4819 /*
4820 * fdfree
4821 *
4822 * Description: Release a filedesc (per process open file table) structure;
4823 * this is done on process exit(), or from forkproc_free() if
4824 * the fork fails for some reason subsequent to a successful
4825 * call to fdcopy()
4826 *
4827 * Parameters: p Pointer to process going away
4828 *
4829 * Returns: void
4830 *
4831 * Locks: This function internally takes and drops proc_fdlock()
4832 */
4833 void
4834 fdfree(proc_t p)
4835 {
4836 struct filedesc *fdp;
4837 struct fileproc *fp;
4838 int i;
4839
4840 proc_fdlock(p);
4841
4842 if (p == kernproc || NULL == (fdp = p->p_fd)) {
4843 proc_fdunlock(p);
4844 return;
4845 }
4846
4847 extern struct filedesc filedesc0;
4848
4849 if (&filedesc0 == fdp)
4850 panic("filedesc0");
4851
4852 if (fdp->fd_nfiles > 0 && fdp->fd_ofiles) {
4853 for (i = fdp->fd_lastfile; i >= 0; i--) {
4854 if ((fp = fdp->fd_ofiles[i]) != NULL) {
4855
4856 if (fdp->fd_ofileflags[i] & UF_RESERVED)
4857 panic("fdfree: found fp with UF_RESERVED");
4858
4859 procfdtbl_reservefd(p, i);
4860
4861 if (i < fdp->fd_knlistsize)
4862 knote_fdclose(p, i);
4863 if (fp->f_flags & FP_WAITEVENT)
4864 (void)waitevent_close(p, fp);
4865 (void) closef_locked(fp, fp->f_fglob, p);
4866 fileproc_free(fp);
4867 }
4868 }
4869 FREE_ZONE(fdp->fd_ofiles, fdp->fd_nfiles * OFILESIZE, M_OFILETABL);
4870 fdp->fd_ofiles = NULL;
4871 fdp->fd_nfiles = 0;
4872 }
4873
4874 proc_fdunlock(p);
4875
4876 if (fdp->fd_cdir)
4877 vnode_rele(fdp->fd_cdir);
4878 if (fdp->fd_rdir)
4879 vnode_rele(fdp->fd_rdir);
4880
4881 proc_fdlock_spin(p);
4882 p->p_fd = NULL;
4883 proc_fdunlock(p);
4884
4885 if (fdp->fd_knlist)
4886 FREE(fdp->fd_knlist, M_KQUEUE);
4887 if (fdp->fd_knhash)
4888 FREE(fdp->fd_knhash, M_KQUEUE);
4889
4890 FREE_ZONE(fdp, sizeof(*fdp), M_FILEDESC);
4891 }
4892
4893 /*
4894 * closef_locked
4895 *
4896 * Description: Internal form of closef; called with proc_fdlock held
4897 *
4898 * Parameters: fp Pointer to fileproc for fd
4899 * fg Pointer to fileglob for fd
4900 * p Pointer to proc structure
4901 *
4902 * Returns: 0 Success
4903 * closef_finish:??? Anything returnable by a per-fileops
4904 * close function
4905 *
4906 * Note: Decrements reference count on file structure; if this was the
4907 * last reference, then closef_finish() is called
4908 *
4909 * p and fp are allowed to be NULL when closing a file that was
4910 * being passed in a message (but only if we are called when this
4911 * is NOT the last reference).
4912 */
4913 int
4914 closef_locked(struct fileproc *fp, struct fileglob *fg, proc_t p)
4915 {
4916 struct vnode *vp;
4917 struct flock lf;
4918 struct vfs_context context;
4919 int error;
4920
4921 if (fg == NULL) {
4922 return (0);
4923 }
4924
4925 /* Set up context with cred stashed in fg */
4926 if (p == current_proc())
4927 context.vc_thread = current_thread();
4928 else
4929 context.vc_thread = NULL;
4930 context.vc_ucred = fg->fg_cred;
4931
4932 /*
4933 * POSIX record locking dictates that any close releases ALL
4934 * locks owned by this process. This is handled by setting
4935 * a flag in the unlock to free ONLY locks obeying POSIX
4936 * semantics, and not to free BSD-style file locks.
4937 * If the descriptor was in a message, POSIX-style locks
4938 * aren't passed with the descriptor.
4939 */
4940 if (p && (p->p_ladvflag & P_LADVLOCK) &&
4941 DTYPE_VNODE == FILEGLOB_DTYPE(fg)) {
4942 proc_fdunlock(p);
4943
4944 lf.l_whence = SEEK_SET;
4945 lf.l_start = 0;
4946 lf.l_len = 0;
4947 lf.l_type = F_UNLCK;
4948 vp = (struct vnode *)fg->fg_data;
4949
4950 if ( (error = vnode_getwithref(vp)) == 0 ) {
4951 (void) VNOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_POSIX, &context, NULL);
4952 (void)vnode_put(vp);
4953 }
4954 proc_fdlock(p);
4955 }
4956 lck_mtx_lock_spin(&fg->fg_lock);
4957 fg->fg_count--;
4958
4959 if (fg->fg_count > 0) {
4960 lck_mtx_unlock(&fg->fg_lock);
4961 return (0);
4962 }
4963 #if DIAGNOSTIC
4964 if (fg->fg_count != 0)
4965 panic("fg %p: being freed with bad fg_count (%d)", fg, fg->fg_count);
4966 #endif
4967
4968 if (fp && (fp->f_flags & FP_WRITTEN))
4969 fg->fg_flag |= FWASWRITTEN;
4970
4971 fg->fg_lflags |= FG_TERM;
4972 lck_mtx_unlock(&fg->fg_lock);
4973
4974 if (p)
4975 proc_fdunlock(p);
4976
4977 /* Since we ensure that fg->fg_ops is always initialized,
4978 * it is safe to invoke fo_close on the fg */
4979 error = fo_close(fg, &context);
4980
4981 fg_free(fg);
4982
4983 if (p)
4984 proc_fdlock(p);
4985
4986 return(error);
4987 }
4988
4989
4990 /*
4991 * fileproc_drain
4992 *
4993 * Description: Drain out pending I/O operations
4994 *
4995 * Parameters: p Process closing this file
4996 * fp fileproc struct for the open
4997 * instance on the file
4998 *
4999 * Returns: void
5000 *
5001 * Locks: Assumes the caller holds the proc_fdlock
5002 *
5003 * Notes: For character devices, this occurs on the last close of the
5004 * device; for all other file descriptors, this occurs on each
5005 * close to prevent fd's from being closed out from under
5006 * operations currently in progress and blocked
5007 *
5008 * See Also: file_vnode(), file_socket(), file_drop(), and the cautions
5009 * regarding their use and interaction with this function.
5010 */
5011 void
5012 fileproc_drain(proc_t p, struct fileproc * fp)
5013 {
5014 struct vfs_context context;
5015
5016 context.vc_thread = proc_thread(p); /* XXX */
5017 context.vc_ucred = fp->f_fglob->fg_cred;
5018
5019 fp->f_iocount-- ; /* (the one the close holds) */
5020
5021 while (fp->f_iocount) {
5022
5023 lck_mtx_convert_spin(&p->p_fdmlock);
5024
5025 if (fp->f_fglob->fg_ops->fo_drain) {
5026 (*fp->f_fglob->fg_ops->fo_drain)(fp, &context);
5027 }
5028 if ((fp->f_flags & FP_INSELECT) == FP_INSELECT) {
5029 if (wait_queue_wakeup_all((wait_queue_t)fp->f_waddr, NULL, THREAD_INTERRUPTED) == KERN_INVALID_ARGUMENT)
5030 panic("bad wait queue for wait_queue_wakeup_all %p", fp->f_waddr);
5031 }
5032 if ((fp->f_flags & FP_SELCONFLICT) == FP_SELCONFLICT) {
5033 if (wait_queue_wakeup_all(&select_conflict_queue, NULL, THREAD_INTERRUPTED) == KERN_INVALID_ARGUMENT)
5034 panic("bad select_conflict_queue");
5035 }
5036 p->p_fpdrainwait = 1;
5037
5038 msleep(&p->p_fpdrainwait, &p->p_fdmlock, PRIBIO, "fpdrain", NULL);
5039
5040 }
5041 #if DIAGNOSTIC
5042 if ((fp->f_flags & FP_INSELECT) != 0)
5043 panic("FP_INSELECT set on drained fp");
5044 #endif
5045 if ((fp->f_flags & FP_SELCONFLICT) == FP_SELCONFLICT)
5046 fp->f_flags &= ~FP_SELCONFLICT;
5047 }
5048
5049
5050 /*
5051 * fp_free
5052 *
5053 * Description: Release the fd and free the fileproc associated with the fd
5054 * in the per process open file table of the specified process;
5055 * these values must correspond.
5056 *
5057 * Parameters: p Process containing fd
5058 * fd fd to be released
5059 * fp fileproc to be freed
5060 *
5061 * Returns: 0 Success
5062 *
5063 * Notes: XXX function should be void - no one interprets the returns
5064 * XXX code
5065 */
5066 int
5067 fp_free(proc_t p, int fd, struct fileproc * fp)
5068 {
5069 proc_fdlock_spin(p);
5070 fdrelse(p, fd);
5071 proc_fdunlock(p);
5072
5073 fg_free(fp->f_fglob);
5074 fileproc_free(fp);
5075 return(0);
5076 }
5077
5078
5079 /*
5080 * flock
5081 *
5082 * Description: Apply an advisory lock on a file descriptor.
5083 *
5084 * Parameters: p Process making request
5085 * uap->fd fd on which the lock is to be
5086 * attempted
5087 * uap->how (Un)Lock bits, including type
5088 * retval Pointer to the call return area
5089 *
5090 * Returns: 0 Success
5091 * fp_getfvp:EBADF Bad file descriptor
5092 * fp_getfvp:ENOTSUP fd does not refer to a vnode
5093 * vnode_getwithref:???
5094 * VNOP_ADVLOCK:???
5095 *
5096 * Implicit returns:
5097 * *retval (modified) Size of dtable
5098 *
5099 * Notes: Just attempt to get a record lock of the requested type on
5100 * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0).
5101 */
5102 int
5103 flock(proc_t p, struct flock_args *uap, __unused int32_t *retval)
5104 {
5105 int fd = uap->fd;
5106 int how = uap->how;
5107 struct fileproc *fp;
5108 struct vnode *vp;
5109 struct flock lf;
5110 vfs_context_t ctx = vfs_context_current();
5111 int error=0;
5112
5113 AUDIT_ARG(fd, uap->fd);
5114 if ( (error = fp_getfvp(p, fd, &fp, &vp)) ) {
5115 return(error);
5116 }
5117 if ( (error = vnode_getwithref(vp)) ) {
5118 goto out1;
5119 }
5120 AUDIT_ARG(vnpath, vp, ARG_VNODE1);
5121
5122 lf.l_whence = SEEK_SET;
5123 lf.l_start = 0;
5124 lf.l_len = 0;
5125 if (how & LOCK_UN) {
5126 lf.l_type = F_UNLCK;
5127 fp->f_flag &= ~FHASLOCK;
5128 error = VNOP_ADVLOCK(vp, (caddr_t)fp->f_fglob, F_UNLCK, &lf, F_FLOCK, ctx, NULL);
5129 goto out;
5130 }
5131 if (how & LOCK_EX)
5132 lf.l_type = F_WRLCK;
5133 else if (how & LOCK_SH)
5134 lf.l_type = F_RDLCK;
5135 else {
5136 error = EBADF;
5137 goto out;
5138 }
5139 #if CONFIG_MACF
5140 error = mac_file_check_lock(proc_ucred(p), fp->f_fglob, F_SETLK, &lf);
5141 if (error)
5142 goto out;
5143 #endif
5144 fp->f_flag |= FHASLOCK;
5145 if (how & LOCK_NB) {
5146 error = VNOP_ADVLOCK(vp, (caddr_t)fp->f_fglob, F_SETLK, &lf, F_FLOCK, ctx, NULL);
5147 goto out;
5148 }
5149 error = VNOP_ADVLOCK(vp, (caddr_t)fp->f_fglob, F_SETLK, &lf, F_FLOCK|F_WAIT, ctx, NULL);
5150 out:
5151 (void)vnode_put(vp);
5152 out1:
5153 fp_drop(p, fd, fp, 0);
5154 return(error);
5155
5156 }
5157
5158 /*
5159 * fileport_makeport
5160 *
5161 * Description: Obtain a Mach send right for a given file descriptor.
5162 *
5163 * Parameters: p Process calling fileport
5164 * uap->fd The fd to reference
5165 * uap->portnamep User address at which to place port name.
5166 *
5167 * Returns: 0 Success.
5168 * EBADF Bad file descriptor.
5169 * EINVAL File descriptor had type that cannot be sent, misc. other errors.
5170 * EFAULT Address at which to store port name is not valid.
5171 * EAGAIN Resource shortage.
5172 *
5173 * Implicit returns:
5174 * On success, name of send right is stored at user-specified address.
5175 */
5176 int
5177 fileport_makeport(proc_t p, struct fileport_makeport_args *uap,
5178 __unused int *retval)
5179 {
5180 int err;
5181 int fd = uap->fd;
5182 user_addr_t user_portaddr = uap->portnamep;
5183 struct fileproc *fp = FILEPROC_NULL;
5184 struct fileglob *fg = NULL;
5185 ipc_port_t fileport;
5186 mach_port_name_t name = MACH_PORT_NULL;
5187
5188 err = fp_lookup(p, fd, &fp, 0);
5189 if (err != 0) {
5190 goto out;
5191 }
5192
5193 if (!filetype_issendable(fp->f_type)) {
5194 err = EINVAL;
5195 goto out;
5196 }
5197
5198 if (FP_ISGUARDED(fp, GUARD_FILEPORT)) {
5199 proc_fdlock(p);
5200 err = fp_guard_exception(p, fd, fp, kGUARD_EXC_FILEPORT);
5201 proc_fdunlock(p);
5202 goto out;
5203 }
5204
5205 /* Dropped when port is deallocated */
5206 fg = fp->f_fglob;
5207 fg_ref(fp);
5208
5209 /* Allocate and initialize a port */
5210 fileport = fileport_alloc(fg);
5211 if (fileport == IPC_PORT_NULL) {
5212 err = EAGAIN;
5213 fg_drop(fp);
5214 goto out;
5215 }
5216
5217 /* Add an entry. Deallocates port on failure. */
5218 name = ipc_port_copyout_send(fileport, get_task_ipcspace(p->task));
5219 if (!MACH_PORT_VALID(name)) {
5220 err = EINVAL;
5221 goto out;
5222 }
5223
5224 err = copyout(&name, user_portaddr, sizeof(mach_port_name_t));
5225 if (err != 0) {
5226 goto out;
5227 }
5228
5229 /* Tag the fileglob for debugging purposes */
5230 lck_mtx_lock_spin(&fg->fg_lock);
5231 fg->fg_lflags |= FG_PORTMADE;
5232 lck_mtx_unlock(&fg->fg_lock);
5233
5234 fp_drop(p, fd, fp, 0);
5235
5236 return 0;
5237
5238 out:
5239 if (MACH_PORT_VALID(name)) {
5240 /* Don't care if another thread races us to deallocate the entry */
5241 (void) mach_port_deallocate(get_task_ipcspace(p->task), name);
5242 }
5243
5244 if (fp != FILEPROC_NULL) {
5245 fp_drop(p, fd, fp, 0);
5246 }
5247
5248 return err;
5249 }
5250
5251 void
5252 fileport_releasefg(struct fileglob *fg)
5253 {
5254 (void)closef_locked(NULL, fg, PROC_NULL);
5255
5256 return;
5257 }
5258
5259
5260 /*
5261 * fileport_makefd
5262 *
5263 * Description: Obtain the file descriptor for a given Mach send right.
5264 *
5265 * Parameters: p Process calling fileport
5266 * uap->port Name of send right to file port.
5267 *
5268 * Returns: 0 Success
5269 * EINVAL Invalid Mach port name, or port is not for a file.
5270 * fdalloc:EMFILE
5271 * fdalloc:ENOMEM Unable to allocate fileproc or extend file table.
5272 *
5273 * Implicit returns:
5274 * *retval (modified) The new descriptor
5275 */
5276 int
5277 fileport_makefd(proc_t p, struct fileport_makefd_args *uap, int32_t *retval)
5278 {
5279 struct fileglob *fg;
5280 struct fileproc *fp = FILEPROC_NULL;
5281 ipc_port_t port = IPC_PORT_NULL;
5282 mach_port_name_t send = uap->port;
5283 kern_return_t res;
5284 int fd;
5285 int err;
5286
5287 res = ipc_object_copyin(get_task_ipcspace(p->task),
5288 send, MACH_MSG_TYPE_COPY_SEND, &port);
5289
5290 if (res != KERN_SUCCESS) {
5291 err = EINVAL;
5292 goto out;
5293 }
5294
5295 fg = fileport_port_to_fileglob(port);
5296 if (fg == NULL) {
5297 err = EINVAL;
5298 goto out;
5299 }
5300
5301 fp = fileproc_alloc_init(NULL);
5302 if (fp == FILEPROC_NULL) {
5303 err = ENOMEM;
5304 goto out;
5305 }
5306
5307 fp->f_fglob = fg;
5308 fg_ref(fp);
5309
5310 proc_fdlock(p);
5311 err = fdalloc(p, 0, &fd);
5312 if (err != 0) {
5313 proc_fdunlock(p);
5314 goto out;
5315 }
5316 *fdflags(p, fd) |= UF_EXCLOSE;
5317
5318 procfdtbl_releasefd(p, fd, fp);
5319 proc_fdunlock(p);
5320
5321 *retval = fd;
5322 err = 0;
5323 out:
5324 if ((fp != NULL) && (0 != err)) {
5325 fileproc_free(fp);
5326 }
5327
5328 if (IPC_PORT_NULL != port) {
5329 ipc_port_release_send(port);
5330 }
5331
5332 return err;
5333 }
5334
5335
5336 /*
5337 * dupfdopen
5338 *
5339 * Description: Duplicate the specified descriptor to a free descriptor;
5340 * this is the second half of fdopen(), above.
5341 *
5342 * Parameters: fdp filedesc pointer to fill in
5343 * indx fd to dup to
5344 * dfd fd to dup from
5345 * mode mode to set on new fd
5346 * error command code
5347 *
5348 * Returns: 0 Success
5349 * EBADF Source fd is bad
5350 * EACCES Requested mode not allowed
5351 * !0 'error', if not ENODEV or
5352 * ENXIO
5353 *
5354 * Notes: XXX This is not thread safe; see fdopen() above
5355 */
5356 int
5357 dupfdopen(struct filedesc *fdp, int indx, int dfd, int flags, int error)
5358 {
5359 struct fileproc *wfp;
5360 struct fileproc *fp;
5361 #if CONFIG_MACF
5362 int myerror;
5363 #endif
5364 proc_t p = current_proc();
5365
5366 /*
5367 * If the to-be-dup'd fd number is greater than the allowed number
5368 * of file descriptors, or the fd to be dup'd has already been
5369 * closed, reject. Note, check for new == old is necessary as
5370 * falloc could allocate an already closed to-be-dup'd descriptor
5371 * as the new descriptor.
5372 */
5373 proc_fdlock(p);
5374
5375 fp = fdp->fd_ofiles[indx];
5376 if (dfd < 0 || dfd >= fdp->fd_nfiles ||
5377 (wfp = fdp->fd_ofiles[dfd]) == NULL || wfp == fp ||
5378 (fdp->fd_ofileflags[dfd] & UF_RESERVED)) {
5379
5380 proc_fdunlock(p);
5381 return (EBADF);
5382 }
5383 #if CONFIG_MACF
5384 myerror = mac_file_check_dup(proc_ucred(p), wfp->f_fglob, dfd);
5385 if (myerror) {
5386 proc_fdunlock(p);
5387 return (myerror);
5388 }
5389 #endif
5390 /*
5391 * There are two cases of interest here.
5392 *
5393 * For ENODEV simply dup (dfd) to file descriptor
5394 * (indx) and return.
5395 *
5396 * For ENXIO steal away the file structure from (dfd) and
5397 * store it in (indx). (dfd) is effectively closed by
5398 * this operation.
5399 *
5400 * Any other error code is just returned.
5401 */
5402 switch (error) {
5403 case ENODEV:
5404 if (FP_ISGUARDED(wfp, GUARD_DUP)) {
5405 int err = fp_guard_exception(p,
5406 dfd, wfp, kGUARD_EXC_DUP);
5407 proc_fdunlock(p);
5408 return (err);
5409 }
5410
5411 /*
5412 * Check that the mode the file is being opened for is a
5413 * subset of the mode of the existing descriptor.
5414 */
5415 if (((flags & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag) {
5416 proc_fdunlock(p);
5417 return (EACCES);
5418 }
5419 if (indx > fdp->fd_lastfile)
5420 fdp->fd_lastfile = indx;
5421 (void)fg_ref(wfp);
5422
5423 if (fp->f_fglob)
5424 fg_free(fp->f_fglob);
5425 fp->f_fglob = wfp->f_fglob;
5426
5427 fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd] |
5428 (flags & O_CLOEXEC) ? UF_EXCLOSE : 0;
5429
5430 proc_fdunlock(p);
5431 return (0);
5432
5433 default:
5434 proc_fdunlock(p);
5435 return (error);
5436 }
5437 /* NOTREACHED */
5438 }
5439
5440
5441 /*
5442 * fg_ref
5443 *
5444 * Description: Add a reference to a fileglob by fileproc
5445 *
5446 * Parameters: fp fileproc containing fileglob
5447 * pointer
5448 *
5449 * Returns: void
5450 *
5451 * Notes: XXX Should use OSAddAtomic?
5452 */
5453 void
5454 fg_ref(struct fileproc * fp)
5455 {
5456 struct fileglob *fg;
5457
5458 fg = fp->f_fglob;
5459
5460 lck_mtx_lock_spin(&fg->fg_lock);
5461
5462 #if DIAGNOSTIC
5463 if ((fp->f_flags & ~((unsigned int)FP_VALID_FLAGS)) != 0)
5464 panic("fg_ref: invalid bits on fp %p", fp);
5465
5466 if (fg->fg_count == 0)
5467 panic("fg_ref: adding fgcount to zeroed fg: fp %p fg %p",
5468 fp, fg);
5469 #endif
5470 fg->fg_count++;
5471 lck_mtx_unlock(&fg->fg_lock);
5472 }
5473
5474
5475 /*
5476 * fg_drop
5477 *
5478 * Description: Remove a reference to a fileglob by fileproc
5479 *
5480 * Parameters: fp fileproc containing fileglob
5481 * pointer
5482 *
5483 * Returns: void
5484 *
5485 * Notes: XXX Should use OSAddAtomic?
5486 */
5487 void
5488 fg_drop(struct fileproc * fp)
5489 {
5490 struct fileglob *fg;
5491
5492 fg = fp->f_fglob;
5493 lck_mtx_lock_spin(&fg->fg_lock);
5494 fg->fg_count--;
5495 lck_mtx_unlock(&fg->fg_lock);
5496 }
5497
5498 #if SOCKETS
5499 /*
5500 * fg_insertuipc
5501 *
5502 * Description: Insert fileglob onto message queue
5503 *
5504 * Parameters: fg Fileglob pointer to insert
5505 *
5506 * Returns: void
5507 *
5508 * Locks: Takes and drops fg_lock, potentially many times
5509 */
5510 void
5511 fg_insertuipc(struct fileglob * fg)
5512 {
5513 int insertque = 0;
5514
5515 lck_mtx_lock_spin(&fg->fg_lock);
5516
5517 while (fg->fg_lflags & FG_RMMSGQ) {
5518 lck_mtx_convert_spin(&fg->fg_lock);
5519
5520 fg->fg_lflags |= FG_WRMMSGQ;
5521 msleep(&fg->fg_lflags, &fg->fg_lock, 0, "fg_insertuipc", NULL);
5522 }
5523
5524 fg->fg_count++;
5525 fg->fg_msgcount++;
5526 if (fg->fg_msgcount == 1) {
5527 fg->fg_lflags |= FG_INSMSGQ;
5528 insertque=1;
5529 }
5530 lck_mtx_unlock(&fg->fg_lock);
5531
5532 if (insertque) {
5533 lck_mtx_lock_spin(uipc_lock);
5534 unp_gc_wait();
5535 LIST_INSERT_HEAD(&fmsghead, fg, f_msglist);
5536 lck_mtx_unlock(uipc_lock);
5537 lck_mtx_lock(&fg->fg_lock);
5538 fg->fg_lflags &= ~FG_INSMSGQ;
5539 if (fg->fg_lflags & FG_WINSMSGQ) {
5540 fg->fg_lflags &= ~FG_WINSMSGQ;
5541 wakeup(&fg->fg_lflags);
5542 }
5543 lck_mtx_unlock(&fg->fg_lock);
5544 }
5545
5546 }
5547
5548
5549 /*
5550 * fg_removeuipc
5551 *
5552 * Description: Remove fileglob from message queue
5553 *
5554 * Parameters: fg Fileglob pointer to remove
5555 *
5556 * Returns: void
5557 *
5558 * Locks: Takes and drops fg_lock, potentially many times
5559 */
5560 void
5561 fg_removeuipc(struct fileglob * fg)
5562 {
5563 int removeque = 0;
5564
5565 lck_mtx_lock_spin(&fg->fg_lock);
5566 while (fg->fg_lflags & FG_INSMSGQ) {
5567 lck_mtx_convert_spin(&fg->fg_lock);
5568
5569 fg->fg_lflags |= FG_WINSMSGQ;
5570 msleep(&fg->fg_lflags, &fg->fg_lock, 0, "fg_removeuipc", NULL);
5571 }
5572 fg->fg_msgcount--;
5573 if (fg->fg_msgcount == 0) {
5574 fg->fg_lflags |= FG_RMMSGQ;
5575 removeque=1;
5576 }
5577 lck_mtx_unlock(&fg->fg_lock);
5578
5579 if (removeque) {
5580 lck_mtx_lock_spin(uipc_lock);
5581 unp_gc_wait();
5582 LIST_REMOVE(fg, f_msglist);
5583 lck_mtx_unlock(uipc_lock);
5584 lck_mtx_lock(&fg->fg_lock);
5585 fg->fg_lflags &= ~FG_RMMSGQ;
5586 if (fg->fg_lflags & FG_WRMMSGQ) {
5587 fg->fg_lflags &= ~FG_WRMMSGQ;
5588 wakeup(&fg->fg_lflags);
5589 }
5590 lck_mtx_unlock(&fg->fg_lock);
5591 }
5592 }
5593 #endif /* SOCKETS */
5594
5595 /*
5596 * fo_read
5597 *
5598 * Description: Generic fileops read indirected through the fileops pointer
5599 * in the fileproc structure
5600 *
5601 * Parameters: fp fileproc structure pointer
5602 * uio user I/O structure pointer
5603 * flags FOF_ flags
5604 * ctx VFS context for operation
5605 *
5606 * Returns: 0 Success
5607 * !0 Errno from read
5608 */
5609 int
5610 fo_read(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
5611 {
5612 return ((*fp->f_ops->fo_read)(fp, uio, flags, ctx));
5613 }
5614
5615
5616 /*
5617 * fo_write
5618 *
5619 * Description: Generic fileops write indirected through the fileops pointer
5620 * in the fileproc structure
5621 *
5622 * Parameters: fp fileproc structure pointer
5623 * uio user I/O structure pointer
5624 * flags FOF_ flags
5625 * ctx VFS context for operation
5626 *
5627 * Returns: 0 Success
5628 * !0 Errno from write
5629 */
5630 int
5631 fo_write(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
5632 {
5633 return((*fp->f_ops->fo_write)(fp, uio, flags, ctx));
5634 }
5635
5636
5637 /*
5638 * fo_ioctl
5639 *
5640 * Description: Generic fileops ioctl indirected through the fileops pointer
5641 * in the fileproc structure
5642 *
5643 * Parameters: fp fileproc structure pointer
5644 * com ioctl command
5645 * data pointer to internalized copy
5646 * of user space ioctl command
5647 * parameter data in kernel space
5648 * ctx VFS context for operation
5649 *
5650 * Returns: 0 Success
5651 * !0 Errno from ioctl
5652 *
5653 * Locks: The caller is assumed to have held the proc_fdlock; this
5654 * function releases and reacquires this lock. If the caller
5655 * accesses data protected by this lock prior to calling this
5656 * function, it will need to revalidate/reacquire any cached
5657 * protected data obtained prior to the call.
5658 */
5659 int
5660 fo_ioctl(struct fileproc *fp, u_long com, caddr_t data, vfs_context_t ctx)
5661 {
5662 int error;
5663
5664 proc_fdunlock(vfs_context_proc(ctx));
5665 error = (*fp->f_ops->fo_ioctl)(fp, com, data, ctx);
5666 proc_fdlock(vfs_context_proc(ctx));
5667 return(error);
5668 }
5669
5670
5671 /*
5672 * fo_select
5673 *
5674 * Description: Generic fileops select indirected through the fileops pointer
5675 * in the fileproc structure
5676 *
5677 * Parameters: fp fileproc structure pointer
5678 * which select which
5679 * wql pointer to wait queue list
5680 * ctx VFS context for operation
5681 *
5682 * Returns: 0 Success
5683 * !0 Errno from select
5684 */
5685 int
5686 fo_select(struct fileproc *fp, int which, void *wql, vfs_context_t ctx)
5687 {
5688 return((*fp->f_ops->fo_select)(fp, which, wql, ctx));
5689 }
5690
5691
5692 /*
5693 * fo_close
5694 *
5695 * Description: Generic fileops close indirected through the fileops pointer
5696 * in the fileproc structure
5697 *
5698 * Parameters: fp fileproc structure pointer for
5699 * file to close
5700 * ctx VFS context for operation
5701 *
5702 * Returns: 0 Success
5703 * !0 Errno from close
5704 */
5705 int
5706 fo_close(struct fileglob *fg, vfs_context_t ctx)
5707 {
5708 return((*fg->fg_ops->fo_close)(fg, ctx));
5709 }
5710
5711
5712 /*
5713 * fo_kqfilter
5714 *
5715 * Description: Generic fileops kqueue filter indirected through the fileops
5716 * pointer in the fileproc structure
5717 *
5718 * Parameters: fp fileproc structure pointer
5719 * kn pointer to knote to filter on
5720 * ctx VFS context for operation
5721 *
5722 * Returns: 0 Success
5723 * !0 Errno from kqueue filter
5724 */
5725 int
5726 fo_kqfilter(struct fileproc *fp, struct knote *kn, vfs_context_t ctx)
5727 {
5728 return ((*fp->f_ops->fo_kqfilter)(fp, kn, ctx));
5729 }
5730
5731 /*
5732 * The ability to send a file descriptor to another
5733 * process is opt-in by file type.
5734 */
5735 boolean_t
5736 filetype_issendable(file_type_t fdtype)
5737 {
5738 switch (fdtype) {
5739 case DTYPE_VNODE:
5740 case DTYPE_SOCKET:
5741 case DTYPE_PIPE:
5742 case DTYPE_PSXSHM:
5743 return TRUE;
5744 default:
5745 /* DTYPE_KQUEUE, DTYPE_FSEVENTS, DTYPE_PSXSEM */
5746 return FALSE;
5747 }
5748 }
5749
5750
5751 struct fileproc *
5752 fileproc_alloc_init(__unused void *arg)
5753 {
5754 struct fileproc *fp;
5755
5756 MALLOC_ZONE(fp, struct fileproc *, sizeof (*fp), M_FILEPROC, M_WAITOK);
5757 if (fp)
5758 bzero(fp, sizeof (*fp));
5759
5760 return (fp);
5761 }
5762
5763 void
5764 fileproc_free(struct fileproc *fp)
5765 {
5766 switch (FILEPROC_TYPE(fp)) {
5767 case FTYPE_SIMPLE:
5768 FREE_ZONE(fp, sizeof (*fp), M_FILEPROC);
5769 break;
5770 case FTYPE_GUARDED:
5771 guarded_fileproc_free(fp);
5772 break;
5773 default:
5774 panic("%s: corrupt fp %p flags %x", __func__, fp, fp->f_flags);
5775 }
5776 }
mirror of XNU