1 | /* $NetBSD: sys_generic.c,v 1.130 2014/09/05 09:20:59 matt Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2007, 2008, 2009 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Andrew Doran. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | /* |
33 | * Copyright (c) 1982, 1986, 1989, 1993 |
34 | * The Regents of the University of California. All rights reserved. |
35 | * (c) UNIX System Laboratories, Inc. |
36 | * All or some portions of this file are derived from material licensed |
37 | * to the University of California by American Telephone and Telegraph |
38 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
39 | * the permission of UNIX System Laboratories, Inc. |
40 | * |
41 | * Redistribution and use in source and binary forms, with or without |
42 | * modification, are permitted provided that the following conditions |
43 | * are met: |
44 | * 1. Redistributions of source code must retain the above copyright |
45 | * notice, this list of conditions and the following disclaimer. |
46 | * 2. Redistributions in binary form must reproduce the above copyright |
47 | * notice, this list of conditions and the following disclaimer in the |
48 | * documentation and/or other materials provided with the distribution. |
49 | * 3. Neither the name of the University nor the names of its contributors |
50 | * may be used to endorse or promote products derived from this software |
51 | * without specific prior written permission. |
52 | * |
53 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
54 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
55 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
56 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
57 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
58 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
59 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
60 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
61 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
62 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
63 | * SUCH DAMAGE. |
64 | * |
65 | * @(#)sys_generic.c 8.9 (Berkeley) 2/14/95 |
66 | */ |
67 | |
68 | /* |
69 | * System calls relating to files. |
70 | */ |
71 | |
72 | #include <sys/cdefs.h> |
73 | __KERNEL_RCSID(0, "$NetBSD: sys_generic.c,v 1.130 2014/09/05 09:20:59 matt Exp $" ); |
74 | |
75 | #include <sys/param.h> |
76 | #include <sys/systm.h> |
77 | #include <sys/filedesc.h> |
78 | #include <sys/ioctl.h> |
79 | #include <sys/file.h> |
80 | #include <sys/proc.h> |
81 | #include <sys/socketvar.h> |
82 | #include <sys/signalvar.h> |
83 | #include <sys/uio.h> |
84 | #include <sys/kernel.h> |
85 | #include <sys/stat.h> |
86 | #include <sys/kmem.h> |
87 | #include <sys/poll.h> |
88 | #include <sys/vnode.h> |
89 | #include <sys/mount.h> |
90 | #include <sys/syscallargs.h> |
91 | #include <sys/ktrace.h> |
92 | #include <sys/atomic.h> |
93 | #include <sys/disklabel.h> |
94 | |
95 | /* |
96 | * Read system call. |
97 | */ |
98 | /* ARGSUSED */ |
99 | int |
100 | sys_read(struct lwp *l, const struct sys_read_args *uap, register_t *retval) |
101 | { |
102 | /* { |
103 | syscallarg(int) fd; |
104 | syscallarg(void *) buf; |
105 | syscallarg(size_t) nbyte; |
106 | } */ |
107 | file_t *fp; |
108 | int fd; |
109 | |
110 | fd = SCARG(uap, fd); |
111 | |
112 | if ((fp = fd_getfile(fd)) == NULL) |
113 | return (EBADF); |
114 | |
115 | if ((fp->f_flag & FREAD) == 0) { |
116 | fd_putfile(fd); |
117 | return (EBADF); |
118 | } |
119 | |
120 | /* dofileread() will unuse the descriptor for us */ |
121 | return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), |
122 | &fp->f_offset, FOF_UPDATE_OFFSET, retval)); |
123 | } |
124 | |
125 | int |
126 | dofileread(int fd, struct file *fp, void *buf, size_t nbyte, |
127 | off_t *offset, int flags, register_t *retval) |
128 | { |
129 | struct iovec aiov; |
130 | struct uio auio; |
131 | size_t cnt; |
132 | int error; |
133 | lwp_t *l; |
134 | |
135 | l = curlwp; |
136 | |
137 | aiov.iov_base = (void *)buf; |
138 | aiov.iov_len = nbyte; |
139 | auio.uio_iov = &aiov; |
140 | auio.uio_iovcnt = 1; |
141 | auio.uio_resid = nbyte; |
142 | auio.uio_rw = UIO_READ; |
143 | auio.uio_vmspace = l->l_proc->p_vmspace; |
144 | |
145 | /* |
146 | * Reads return ssize_t because -1 is returned on error. Therefore |
147 | * we must restrict the length to SSIZE_MAX to avoid garbage return |
148 | * values. |
149 | */ |
150 | if (auio.uio_resid > SSIZE_MAX) { |
151 | error = EINVAL; |
152 | goto out; |
153 | } |
154 | |
155 | cnt = auio.uio_resid; |
156 | error = (*fp->f_ops->fo_read)(fp, offset, &auio, fp->f_cred, flags); |
157 | if (error) |
158 | if (auio.uio_resid != cnt && (error == ERESTART || |
159 | error == EINTR || error == EWOULDBLOCK)) |
160 | error = 0; |
161 | cnt -= auio.uio_resid; |
162 | ktrgenio(fd, UIO_READ, buf, cnt, error); |
163 | *retval = cnt; |
164 | out: |
165 | fd_putfile(fd); |
166 | return (error); |
167 | } |
168 | |
169 | /* |
170 | * Scatter read system call. |
171 | */ |
172 | int |
173 | sys_readv(struct lwp *l, const struct sys_readv_args *uap, register_t *retval) |
174 | { |
175 | /* { |
176 | syscallarg(int) fd; |
177 | syscallarg(const struct iovec *) iovp; |
178 | syscallarg(int) iovcnt; |
179 | } */ |
180 | |
181 | return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), |
182 | SCARG(uap, iovcnt), NULL, FOF_UPDATE_OFFSET, retval); |
183 | } |
184 | |
185 | int |
186 | do_filereadv(int fd, const struct iovec *iovp, int iovcnt, |
187 | off_t *offset, int flags, register_t *retval) |
188 | { |
189 | struct uio auio; |
190 | struct iovec *iov, *needfree = NULL, aiov[UIO_SMALLIOV]; |
191 | int i, error; |
192 | size_t cnt; |
193 | u_int iovlen; |
194 | struct file *fp; |
195 | struct iovec *ktriov = NULL; |
196 | |
197 | if (iovcnt == 0) |
198 | return EINVAL; |
199 | |
200 | if ((fp = fd_getfile(fd)) == NULL) |
201 | return EBADF; |
202 | |
203 | if ((fp->f_flag & FREAD) == 0) { |
204 | fd_putfile(fd); |
205 | return EBADF; |
206 | } |
207 | |
208 | if (offset == NULL) |
209 | offset = &fp->f_offset; |
210 | else { |
211 | struct vnode *vp = fp->f_vnode; |
212 | if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { |
213 | error = ESPIPE; |
214 | goto out; |
215 | } |
216 | /* |
217 | * Test that the device is seekable ? |
218 | * XXX This works because no file systems actually |
219 | * XXX take any action on the seek operation. |
220 | */ |
221 | error = VOP_SEEK(vp, fp->f_offset, *offset, fp->f_cred); |
222 | if (error != 0) |
223 | goto out; |
224 | } |
225 | |
226 | iovlen = iovcnt * sizeof(struct iovec); |
227 | if (flags & FOF_IOV_SYSSPACE) |
228 | iov = __UNCONST(iovp); |
229 | else { |
230 | iov = aiov; |
231 | if ((u_int)iovcnt > UIO_SMALLIOV) { |
232 | if ((u_int)iovcnt > IOV_MAX) { |
233 | error = EINVAL; |
234 | goto out; |
235 | } |
236 | iov = kmem_alloc(iovlen, KM_SLEEP); |
237 | if (iov == NULL) { |
238 | error = ENOMEM; |
239 | goto out; |
240 | } |
241 | needfree = iov; |
242 | } |
243 | error = copyin(iovp, iov, iovlen); |
244 | if (error) |
245 | goto done; |
246 | } |
247 | |
248 | auio.uio_iov = iov; |
249 | auio.uio_iovcnt = iovcnt; |
250 | auio.uio_rw = UIO_READ; |
251 | auio.uio_vmspace = curproc->p_vmspace; |
252 | |
253 | auio.uio_resid = 0; |
254 | for (i = 0; i < iovcnt; i++, iov++) { |
255 | auio.uio_resid += iov->iov_len; |
256 | /* |
257 | * Reads return ssize_t because -1 is returned on error. |
258 | * Therefore we must restrict the length to SSIZE_MAX to |
259 | * avoid garbage return values. |
260 | */ |
261 | if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) { |
262 | error = EINVAL; |
263 | goto done; |
264 | } |
265 | } |
266 | |
267 | /* |
268 | * if tracing, save a copy of iovec |
269 | */ |
270 | if (ktrpoint(KTR_GENIO)) { |
271 | ktriov = kmem_alloc(iovlen, KM_SLEEP); |
272 | if (ktriov != NULL) |
273 | memcpy(ktriov, auio.uio_iov, iovlen); |
274 | } |
275 | |
276 | cnt = auio.uio_resid; |
277 | error = (*fp->f_ops->fo_read)(fp, offset, &auio, fp->f_cred, flags); |
278 | if (error) |
279 | if (auio.uio_resid != cnt && (error == ERESTART || |
280 | error == EINTR || error == EWOULDBLOCK)) |
281 | error = 0; |
282 | cnt -= auio.uio_resid; |
283 | *retval = cnt; |
284 | |
285 | if (ktriov != NULL) { |
286 | ktrgeniov(fd, UIO_READ, ktriov, cnt, error); |
287 | kmem_free(ktriov, iovlen); |
288 | } |
289 | |
290 | done: |
291 | if (needfree) |
292 | kmem_free(needfree, iovlen); |
293 | out: |
294 | fd_putfile(fd); |
295 | return (error); |
296 | } |
297 | |
298 | /* |
299 | * Write system call |
300 | */ |
301 | int |
302 | sys_write(struct lwp *l, const struct sys_write_args *uap, register_t *retval) |
303 | { |
304 | /* { |
305 | syscallarg(int) fd; |
306 | syscallarg(const void *) buf; |
307 | syscallarg(size_t) nbyte; |
308 | } */ |
309 | file_t *fp; |
310 | int fd; |
311 | |
312 | fd = SCARG(uap, fd); |
313 | |
314 | if ((fp = fd_getfile(fd)) == NULL) |
315 | return (EBADF); |
316 | |
317 | if ((fp->f_flag & FWRITE) == 0) { |
318 | fd_putfile(fd); |
319 | return (EBADF); |
320 | } |
321 | |
322 | /* dofilewrite() will unuse the descriptor for us */ |
323 | return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), |
324 | &fp->f_offset, FOF_UPDATE_OFFSET, retval)); |
325 | } |
326 | |
327 | int |
328 | dofilewrite(int fd, struct file *fp, const void *buf, |
329 | size_t nbyte, off_t *offset, int flags, register_t *retval) |
330 | { |
331 | struct iovec aiov; |
332 | struct uio auio; |
333 | size_t cnt; |
334 | int error; |
335 | |
336 | aiov.iov_base = __UNCONST(buf); /* XXXUNCONST kills const */ |
337 | aiov.iov_len = nbyte; |
338 | auio.uio_iov = &aiov; |
339 | auio.uio_iovcnt = 1; |
340 | auio.uio_resid = nbyte; |
341 | auio.uio_rw = UIO_WRITE; |
342 | auio.uio_vmspace = curproc->p_vmspace; |
343 | |
344 | /* |
345 | * Writes return ssize_t because -1 is returned on error. Therefore |
346 | * we must restrict the length to SSIZE_MAX to avoid garbage return |
347 | * values. |
348 | */ |
349 | if (auio.uio_resid > SSIZE_MAX) { |
350 | error = EINVAL; |
351 | goto out; |
352 | } |
353 | |
354 | cnt = auio.uio_resid; |
355 | error = (*fp->f_ops->fo_write)(fp, offset, &auio, fp->f_cred, flags); |
356 | if (error) { |
357 | if (auio.uio_resid != cnt && (error == ERESTART || |
358 | error == EINTR || error == EWOULDBLOCK)) |
359 | error = 0; |
360 | if (error == EPIPE && !(fp->f_flag & FNOSIGPIPE)) { |
361 | mutex_enter(proc_lock); |
362 | psignal(curproc, SIGPIPE); |
363 | mutex_exit(proc_lock); |
364 | } |
365 | } |
366 | cnt -= auio.uio_resid; |
367 | ktrgenio(fd, UIO_WRITE, buf, cnt, error); |
368 | *retval = cnt; |
369 | out: |
370 | fd_putfile(fd); |
371 | return (error); |
372 | } |
373 | |
374 | /* |
375 | * Gather write system call |
376 | */ |
377 | int |
378 | sys_writev(struct lwp *l, const struct sys_writev_args *uap, register_t *retval) |
379 | { |
380 | /* { |
381 | syscallarg(int) fd; |
382 | syscallarg(const struct iovec *) iovp; |
383 | syscallarg(int) iovcnt; |
384 | } */ |
385 | |
386 | return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), |
387 | SCARG(uap, iovcnt), NULL, FOF_UPDATE_OFFSET, retval); |
388 | } |
389 | |
390 | int |
391 | do_filewritev(int fd, const struct iovec *iovp, int iovcnt, |
392 | off_t *offset, int flags, register_t *retval) |
393 | { |
394 | struct uio auio; |
395 | struct iovec *iov, *needfree = NULL, aiov[UIO_SMALLIOV]; |
396 | int i, error; |
397 | size_t cnt; |
398 | u_int iovlen; |
399 | struct file *fp; |
400 | struct iovec *ktriov = NULL; |
401 | |
402 | if (iovcnt == 0) |
403 | return EINVAL; |
404 | |
405 | if ((fp = fd_getfile(fd)) == NULL) |
406 | return EBADF; |
407 | |
408 | if ((fp->f_flag & FWRITE) == 0) { |
409 | fd_putfile(fd); |
410 | return EBADF; |
411 | } |
412 | |
413 | if (offset == NULL) |
414 | offset = &fp->f_offset; |
415 | else { |
416 | struct vnode *vp = fp->f_vnode; |
417 | if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { |
418 | error = ESPIPE; |
419 | goto out; |
420 | } |
421 | /* |
422 | * Test that the device is seekable ? |
423 | * XXX This works because no file systems actually |
424 | * XXX take any action on the seek operation. |
425 | */ |
426 | error = VOP_SEEK(vp, fp->f_offset, *offset, fp->f_cred); |
427 | if (error != 0) |
428 | goto out; |
429 | } |
430 | |
431 | iovlen = iovcnt * sizeof(struct iovec); |
432 | if (flags & FOF_IOV_SYSSPACE) |
433 | iov = __UNCONST(iovp); |
434 | else { |
435 | iov = aiov; |
436 | if ((u_int)iovcnt > UIO_SMALLIOV) { |
437 | if ((u_int)iovcnt > IOV_MAX) { |
438 | error = EINVAL; |
439 | goto out; |
440 | } |
441 | iov = kmem_alloc(iovlen, KM_SLEEP); |
442 | if (iov == NULL) { |
443 | error = ENOMEM; |
444 | goto out; |
445 | } |
446 | needfree = iov; |
447 | } |
448 | error = copyin(iovp, iov, iovlen); |
449 | if (error) |
450 | goto done; |
451 | } |
452 | |
453 | auio.uio_iov = iov; |
454 | auio.uio_iovcnt = iovcnt; |
455 | auio.uio_rw = UIO_WRITE; |
456 | auio.uio_vmspace = curproc->p_vmspace; |
457 | |
458 | auio.uio_resid = 0; |
459 | for (i = 0; i < iovcnt; i++, iov++) { |
460 | auio.uio_resid += iov->iov_len; |
461 | /* |
462 | * Writes return ssize_t because -1 is returned on error. |
463 | * Therefore we must restrict the length to SSIZE_MAX to |
464 | * avoid garbage return values. |
465 | */ |
466 | if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) { |
467 | error = EINVAL; |
468 | goto done; |
469 | } |
470 | } |
471 | |
472 | /* |
473 | * if tracing, save a copy of iovec |
474 | */ |
475 | if (ktrpoint(KTR_GENIO)) { |
476 | ktriov = kmem_alloc(iovlen, KM_SLEEP); |
477 | if (ktriov != NULL) |
478 | memcpy(ktriov, auio.uio_iov, iovlen); |
479 | } |
480 | |
481 | cnt = auio.uio_resid; |
482 | error = (*fp->f_ops->fo_write)(fp, offset, &auio, fp->f_cred, flags); |
483 | if (error) { |
484 | if (auio.uio_resid != cnt && (error == ERESTART || |
485 | error == EINTR || error == EWOULDBLOCK)) |
486 | error = 0; |
487 | if (error == EPIPE && !(fp->f_flag & FNOSIGPIPE)) { |
488 | mutex_enter(proc_lock); |
489 | psignal(curproc, SIGPIPE); |
490 | mutex_exit(proc_lock); |
491 | } |
492 | } |
493 | cnt -= auio.uio_resid; |
494 | *retval = cnt; |
495 | |
496 | if (ktriov != NULL) { |
497 | ktrgeniov(fd, UIO_WRITE, ktriov, cnt, error); |
498 | kmem_free(ktriov, iovlen); |
499 | } |
500 | |
501 | done: |
502 | if (needfree) |
503 | kmem_free(needfree, iovlen); |
504 | out: |
505 | fd_putfile(fd); |
506 | return (error); |
507 | } |
508 | |
509 | /* |
510 | * Ioctl system call |
511 | */ |
512 | /* ARGSUSED */ |
513 | int |
514 | sys_ioctl(struct lwp *l, const struct sys_ioctl_args *uap, register_t *retval) |
515 | { |
516 | /* { |
517 | syscallarg(int) fd; |
518 | syscallarg(u_long) com; |
519 | syscallarg(void *) data; |
520 | } */ |
521 | struct file *fp; |
522 | proc_t *p; |
523 | u_long com; |
524 | int error; |
525 | size_t size, alloc_size; |
526 | void *data, *memp; |
527 | #define STK_PARAMS 128 |
528 | u_long stkbuf[STK_PARAMS/sizeof(u_long)]; |
529 | #if __TMPBIGMAXPARTITIONS > MAXPARTITIONS |
530 | size_t zero_last = 0; |
531 | #define zero_size(SZ) ((SZ)+zero_last) |
532 | #else |
533 | #define zero_size(SZ) (SZ) |
534 | #endif |
535 | |
536 | memp = NULL; |
537 | alloc_size = 0; |
538 | error = 0; |
539 | p = l->l_proc; |
540 | |
541 | if ((fp = fd_getfile(SCARG(uap, fd))) == NULL) |
542 | return (EBADF); |
543 | |
544 | if ((fp->f_flag & (FREAD | FWRITE)) == 0) { |
545 | error = EBADF; |
546 | com = 0; |
547 | goto out; |
548 | } |
549 | |
550 | switch (com = SCARG(uap, com)) { |
551 | case FIONCLEX: |
552 | case FIOCLEX: |
553 | fd_set_exclose(l, SCARG(uap, fd), com == FIOCLEX); |
554 | goto out; |
555 | } |
556 | |
557 | /* |
558 | * Interpret high order word to find amount of data to be |
559 | * copied to/from the user's address space. |
560 | */ |
561 | size = IOCPARM_LEN(com); |
562 | alloc_size = size; |
563 | |
564 | /* |
565 | * The disklabel is now padded to a multiple of 8 bytes however the old |
566 | * disklabel on 32bit platforms wasn't. This leaves a difference in |
567 | * size of 4 bytes between the two but are otherwise identical. |
568 | * To deal with this, we allocate enough space for the new disklabel |
569 | * but only copyin/out the smaller amount. |
570 | */ |
571 | if (IOCGROUP(com) == 'd') { |
572 | #if __TMPBIGMAXPARTITIONS > MAXPARTITIONS |
573 | u_long ocom = com; |
574 | #endif |
575 | u_long ncom = com ^ (DIOCGDINFO ^ DIOCGDINFO32); |
576 | |
577 | #if __TMPBIGMAXPARTITIONS > MAXPARTITIONS |
578 | /* |
579 | * Userland might use struct disklabel that is bigger than the |
580 | * the kernel version (historic accident) - alloc userland |
581 | * size and zero unused part on copyout. |
582 | */ |
583 | #define DISKLABELLENDIFF (sizeof(struct partition) \ |
584 | *(__TMPBIGMAXPARTITIONS-MAXPARTITIONS)) |
585 | #define IOCFIXUP(NIOC) ((NIOC&~(IOCPARM_MASK<<IOCPARM_SHIFT)) | \ |
586 | (IOCPARM_LEN(NIOC)-DISKLABELLENDIFF)<<IOCPARM_SHIFT) |
587 | |
588 | switch (IOCFIXUP(ocom)) { |
589 | case DIOCGDINFO: |
590 | case DIOCWDINFO: |
591 | case DIOCSDINFO: |
592 | case DIOCGDEFLABEL: |
593 | com = ncom = IOCFIXUP(ocom); |
594 | zero_last = DISKLABELLENDIFF; |
595 | size -= DISKLABELLENDIFF; |
596 | goto done; |
597 | } |
598 | #endif |
599 | |
600 | switch (ncom) { |
601 | case DIOCGDINFO: |
602 | case DIOCWDINFO: |
603 | case DIOCSDINFO: |
604 | case DIOCGDEFLABEL: |
605 | com = ncom; |
606 | if (IOCPARM_LEN(DIOCGDINFO32) < IOCPARM_LEN(DIOCGDINFO)) |
607 | alloc_size = IOCPARM_LEN(DIOCGDINFO); |
608 | break; |
609 | } |
610 | #if __TMPBIGMAXPARTITIONS > MAXPARTITIONS |
611 | done: ; |
612 | #endif |
613 | } |
614 | if (size > IOCPARM_MAX) { |
615 | error = ENOTTY; |
616 | goto out; |
617 | } |
618 | memp = NULL; |
619 | if ((com >> IOCPARM_SHIFT) == 0) { |
620 | /* UNIX-style ioctl. */ |
621 | data = SCARG(uap, data); |
622 | } else { |
623 | if (alloc_size > sizeof(stkbuf)) { |
624 | memp = kmem_alloc(alloc_size, KM_SLEEP); |
625 | data = memp; |
626 | } else { |
627 | data = (void *)stkbuf; |
628 | } |
629 | if (com&IOC_IN) { |
630 | if (size) { |
631 | error = copyin(SCARG(uap, data), data, size); |
632 | if (error) { |
633 | goto out; |
634 | } |
635 | /* |
636 | * The data between size and alloc_size has |
637 | * not been overwritten. It shouldn't matter |
638 | * but let's clear that anyway. |
639 | */ |
640 | if (__predict_false(size < alloc_size)) { |
641 | memset((char *)data+size, 0, |
642 | alloc_size - size); |
643 | } |
644 | ktrgenio(SCARG(uap, fd), UIO_WRITE, |
645 | SCARG(uap, data), size, 0); |
646 | } else { |
647 | *(void **)data = SCARG(uap, data); |
648 | } |
649 | } else if ((com&IOC_OUT) && size) { |
650 | /* |
651 | * Zero the buffer so the user always |
652 | * gets back something deterministic. |
653 | */ |
654 | memset(data, 0, zero_size(size)); |
655 | } else if (com&IOC_VOID) { |
656 | *(void **)data = SCARG(uap, data); |
657 | } |
658 | } |
659 | |
660 | switch (com) { |
661 | |
662 | case FIONBIO: |
663 | /* XXX Code block is not atomic */ |
664 | if (*(int *)data != 0) |
665 | atomic_or_uint(&fp->f_flag, FNONBLOCK); |
666 | else |
667 | atomic_and_uint(&fp->f_flag, ~FNONBLOCK); |
668 | error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, data); |
669 | break; |
670 | |
671 | case FIOASYNC: |
672 | /* XXX Code block is not atomic */ |
673 | if (*(int *)data != 0) |
674 | atomic_or_uint(&fp->f_flag, FASYNC); |
675 | else |
676 | atomic_and_uint(&fp->f_flag, ~FASYNC); |
677 | error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, data); |
678 | break; |
679 | |
680 | default: |
681 | error = (*fp->f_ops->fo_ioctl)(fp, com, data); |
682 | /* |
683 | * Copy any data to user, size was |
684 | * already set and checked above. |
685 | */ |
686 | if (error == 0 && (com&IOC_OUT) && size) { |
687 | error = copyout(data, SCARG(uap, data), |
688 | zero_size(size)); |
689 | ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, data), |
690 | size, error); |
691 | } |
692 | break; |
693 | } |
694 | out: |
695 | if (memp) |
696 | kmem_free(memp, alloc_size); |
697 | fd_putfile(SCARG(uap, fd)); |
698 | switch (error) { |
699 | case -1: |
700 | printf("sys_ioctl: _IO%s%s('%c', %lu, %lu) returned -1: " |
701 | "pid=%d comm=%s\n" , |
702 | (com & IOC_IN) ? "W" : "" , (com & IOC_OUT) ? "R" : "" , |
703 | (char)IOCGROUP(com), (com & 0xff), IOCPARM_LEN(com), |
704 | p->p_pid, p->p_comm); |
705 | /* FALLTHROUGH */ |
706 | case EPASSTHROUGH: |
707 | error = ENOTTY; |
708 | /* FALLTHROUGH */ |
709 | default: |
710 | return (error); |
711 | } |
712 | } |
713 | |