1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34 /*
35 * Get file attribute information through a file name or a file descriptor.
36 */
37
38 #include <sys/param.h>
39 #include <sys/isa_defs.h>
40 #include <sys/types.h>
41 #include <sys/sysmacros.h>
42 #include <sys/cred.h>
43 #include <sys/systm.h>
44 #include <sys/errno.h>
45 #include <sys/fcntl.h>
46 #include <sys/pathname.h>
47 #include <sys/stat.h>
48 #include <sys/vfs.h>
49 #include <sys/vnode.h>
50 #include <sys/mode.h>
51 #include <sys/file.h>
52 #include <sys/proc.h>
53 #include <sys/uio.h>
54 #include <sys/debug.h>
55 #include <sys/cmn_err.h>
56 #include <c2/audit.h>
57 #include <fs/fs_subr.h>
58
59 /*
60 * Get the vp to be stated and the cred to be used for the call
61 * to VOP_GETATTR
62 */
63
64 int
65 cstatat_getvp(int fd, char *name, int follow, vnode_t **vp, cred_t **cred)
66 {
67 vnode_t *startvp;
68 file_t *fp;
69 int error;
70 cred_t *cr;
71 int estale_retry = 0;
72
73 *vp = NULL;
74
75 /*
76 * Only return EFAULT for fstatat when fd == AT_FDCWD && name == NULL
77 */
78
79 if (fd == AT_FDCWD) {
80 startvp = NULL;
81 cr = CRED();
82 crhold(cr);
83 } else {
84 char startchar;
85
86 if (copyin(name, &startchar, sizeof (char)))
87 return (EFAULT);
88 if (startchar != '/') {
89 if ((fp = getf(fd)) == NULL) {
90 return (EBADF);
91 }
92 startvp = fp->f_vnode;
93 cr = fp->f_cred;
94 crhold(cr);
95 VN_HOLD(startvp);
96 releasef(fd);
97 } else {
98 startvp = NULL;
99 cr = CRED();
100 crhold(cr);
101 }
102 }
103 *cred = cr;
104
105 if (AU_AUDITING() && startvp != NULL)
106 audit_setfsat_path(1);
107
108 lookup:
109 if (error = lookupnameat(name, UIO_USERSPACE, follow, NULLVPP,
110 vp, startvp)) {
111 if ((error == ESTALE) &&
112 fs_need_estale_retry(estale_retry++))
113 goto lookup;
114 if (startvp != NULL)
115 VN_RELE(startvp);
116 crfree(cr);
117 return (error);
118 }
119 if (startvp != NULL)
120 VN_RELE(startvp);
121
122 return (0);
123 }
124
125 /*
126 * Native syscall interfaces:
127 *
128 * N-bit kernel, N-bit applications, N-bit file offsets
129 */
130
131 static int cstatat(int, char *, struct stat *, int, int);
132 static int cstat(vnode_t *vp, struct stat *, int, cred_t *);
133
134 /*
135 * fstat can and should be fast, do an inline implementation here.
136 */
137 #define FSTAT_BODY(fd, sb, statfn) \
138 { \
139 file_t *fp; \
140 int error; \
141 \
142 if (fd == AT_FDCWD) \
143 return (set_errno(EFAULT)); \
144 if ((fp = getf(fd)) == NULL) \
145 return (set_errno(EBADF)); \
146 error = statfn(fp->f_vnode, sb, 0, fp->f_cred); \
147 releasef(fd); \
148 if (error) \
149 return (set_errno(error)); \
150 return (0); \
151 }
152
153 int
154 fstat(int fd, struct stat *sb)
155 {
156 FSTAT_BODY(fd, sb, cstat)
157 }
158
159 int
160 fstatat(int fd, char *name, struct stat *sb, int flags)
161 {
162 int followflag;
163 int csflags;
164
165 if (name == NULL)
166 return (fstat(fd, sb));
167
168 followflag = (flags & AT_SYMLINK_NOFOLLOW);
169 csflags = (flags & _AT_TRIGGER ? ATTR_TRIGGER : 0);
170 if (followflag == 0)
171 csflags |= ATTR_REAL; /* flag for procfs lookups */
172
173 return (cstatat(fd, name, sb, followflag, csflags));
174 }
175
176 int
177 stat(char *name, struct stat *sb)
178 {
179 return (fstatat(AT_FDCWD, name, sb, 0));
180 }
181
182 int
183 lstat(char *name, struct stat *sb)
184 {
185 return (fstatat(AT_FDCWD, name, sb, AT_SYMLINK_NOFOLLOW));
186 }
187
188 /*
189 * Common code for stat(), lstat(), and fstat().
190 * (32-bit kernel, 32-bit applications, 32-bit files)
191 * (64-bit kernel, 64-bit applications, 64-bit files)
192 */
193 static int
194 cstat(vnode_t *vp, struct stat *ubp, int flag, cred_t *cr)
195 {
196 struct vfssw *vswp;
197 struct stat sb;
198 vattr_t vattr;
199 int error;
200
201 vattr.va_mask = AT_STAT | AT_NBLOCKS | AT_BLKSIZE | AT_SIZE;
202 if ((error = VOP_GETATTR(vp, &vattr, flag, cr, NULL)) != 0)
203 return (error);
204 #ifdef _ILP32
205 /*
206 * (32-bit kernel, 32-bit applications, 32-bit files)
207 * NOTE: 32-bit kernel maintains a 64-bit unsigend va_size.
208 *
209 * st_size of devices (VBLK and VCHR special files) is a special case.
210 * POSIX does not define size behavior for special files, so the
211 * following Solaris specific behavior is not a violation. Solaris
212 * returns the size of the device.
213 *
214 * For compatibility with 32-bit programs which happen to do stat() on
215 * a (mknod) bigger than 2GB we suppress the large file EOVERFLOW and
216 * instead we return the value MAXOFF32_T (LONG_MAX).
217 *
218 * 32-bit applications that care about the size of devices should be
219 * built 64-bit or use a large file interface (lfcompile(5) or lf64(5)).
220 */
221 if ((vattr.va_size > MAXOFF32_T) &&
222 ((vp->v_type == VBLK) || (vp->v_type == VCHR))) {
223 /* OVERFLOW | UNKNOWN_SIZE */
224 vattr.va_size = MAXOFF32_T;
225 }
226 #endif /* _ILP32 */
227 if (vattr.va_size > MAXOFF_T || vattr.va_nblocks > LONG_MAX ||
228 vattr.va_nodeid > ULONG_MAX)
229 return (EOVERFLOW);
230
231 bzero(&sb, sizeof (sb));
232 sb.st_dev = vattr.va_fsid;
233 sb.st_ino = (ino_t)vattr.va_nodeid;
234 sb.st_mode = VTTOIF(vattr.va_type) | vattr.va_mode;
235 sb.st_nlink = vattr.va_nlink;
236 sb.st_uid = vattr.va_uid;
237 sb.st_gid = vattr.va_gid;
238 sb.st_rdev = vattr.va_rdev;
239 sb.st_size = (off_t)vattr.va_size;
240 sb.st_atim = vattr.va_atime;
241 sb.st_mtim = vattr.va_mtime;
242 sb.st_ctim = vattr.va_ctime;
243 sb.st_blksize = vattr.va_blksize;
244 sb.st_blocks = (blkcnt_t)vattr.va_nblocks;
245 if (vp->v_vfsp != NULL) {
246 vswp = &vfssw[vp->v_vfsp->vfs_fstype];
247 if (vswp->vsw_name && *vswp->vsw_name)
248 (void) strcpy(sb.st_fstype, vswp->vsw_name);
249 }
250 if (copyout(&sb, ubp, sizeof (sb)))
251 return (EFAULT);
252 return (0);
253 }
254
255 static int
256 cstatat(int fd, char *name, struct stat *sb, int follow, int flags)
257 {
258 vnode_t *vp;
259 int error;
260 cred_t *cred;
261 int link_follow;
262 int estale_retry = 0;
263
264 link_follow = (follow == AT_SYMLINK_NOFOLLOW) ? NO_FOLLOW : FOLLOW;
265 lookup:
266 if (error = cstatat_getvp(fd, name, link_follow, &vp, &cred))
267 return (set_errno(error));
268 error = cstat(vp, sb, flags, cred);
269 crfree(cred);
270 VN_RELE(vp);
271 if (error != 0) {
272 if (error == ESTALE &&
273 fs_need_estale_retry(estale_retry++))
274 goto lookup;
275 return (set_errno(error));
276 }
277 return (0);
278 }
279
280 #if defined(_SYSCALL32_IMPL)
281
282 /*
283 * 64-bit kernel, 32-bit applications, 32-bit file offsets
284 */
285 static int cstatat32(int, char *, struct stat32 *, int, int);
286 static int cstat32(vnode_t *, struct stat32 *, int, cred_t *);
287
288 int
289 fstat32(int fd, struct stat32 *sb)
290 {
291 FSTAT_BODY(fd, sb, cstat32)
292 }
293
294 int
295 fstatat32(int fd, char *name, struct stat32 *sb, int flags)
296 {
297 int followflag;
298 int csflags;
299
300 if (name == NULL)
301 return (fstat32(fd, sb));
302
303 followflag = (flags & AT_SYMLINK_NOFOLLOW);
304 csflags = (flags & _AT_TRIGGER ? ATTR_TRIGGER : 0);
305 if (followflag == 0)
306 csflags |= ATTR_REAL; /* flag for procfs lookups */
307
308 return (cstatat32(fd, name, sb, followflag, csflags));
309 }
310
311 int
312 stat32(char *name, struct stat32 *sb)
313 {
314 return (fstatat32(AT_FDCWD, name, sb, 0));
315 }
316
317 int
318 lstat32(char *name, struct stat32 *sb)
319 {
320 return (fstatat32(AT_FDCWD, name, sb, AT_SYMLINK_NOFOLLOW));
321 }
322
323 static int
324 cstat32(vnode_t *vp, struct stat32 *ubp, int flag, struct cred *cr)
325 {
326 struct vfssw *vswp;
327 struct stat32 sb;
328 vattr_t vattr;
329 int error;
330 dev32_t st_dev, st_rdev;
331
332 vattr.va_mask = AT_STAT | AT_NBLOCKS | AT_BLKSIZE | AT_SIZE;
333 if (error = VOP_GETATTR(vp, &vattr, flag, cr, NULL))
334 return (error);
335
336 /* devices are a special case, see comments in cstat */
337 if ((vattr.va_size > MAXOFF32_T) &&
338 ((vp->v_type == VBLK) || (vp->v_type == VCHR))) {
339 /* OVERFLOW | UNKNOWN_SIZE */
340 vattr.va_size = MAXOFF32_T;
341 }
342
343 /* check for large values */
344 if (!cmpldev(&st_dev, vattr.va_fsid) ||
345 !cmpldev(&st_rdev, vattr.va_rdev) ||
346 vattr.va_size > MAXOFF32_T ||
347 vattr.va_nblocks > INT32_MAX ||
348 vattr.va_nodeid > UINT32_MAX ||
349 TIMESPEC_OVERFLOW(&(vattr.va_atime)) ||
350 TIMESPEC_OVERFLOW(&(vattr.va_mtime)) ||
351 TIMESPEC_OVERFLOW(&(vattr.va_ctime)))
352 return (EOVERFLOW);
353
354 bzero(&sb, sizeof (sb));
355 sb.st_dev = st_dev;
356 sb.st_ino = (ino32_t)vattr.va_nodeid;
357 sb.st_mode = VTTOIF(vattr.va_type) | vattr.va_mode;
358 sb.st_nlink = vattr.va_nlink;
359 sb.st_uid = vattr.va_uid;
360 sb.st_gid = vattr.va_gid;
361 sb.st_rdev = st_rdev;
362 sb.st_size = (off32_t)vattr.va_size;
363 TIMESPEC_TO_TIMESPEC32(&(sb.st_atim), &(vattr.va_atime));
364 TIMESPEC_TO_TIMESPEC32(&(sb.st_mtim), &(vattr.va_mtime));
365 TIMESPEC_TO_TIMESPEC32(&(sb.st_ctim), &(vattr.va_ctime));
366 sb.st_blksize = vattr.va_blksize;
367 sb.st_blocks = (blkcnt32_t)vattr.va_nblocks;
368 if (vp->v_vfsp != NULL) {
369 vswp = &vfssw[vp->v_vfsp->vfs_fstype];
370 if (vswp->vsw_name && *vswp->vsw_name)
371 (void) strcpy(sb.st_fstype, vswp->vsw_name);
372 }
373 if (copyout(&sb, ubp, sizeof (sb)))
374 return (EFAULT);
375 return (0);
376 }
377
378 static int
379 cstatat32(int fd, char *name, struct stat32 *sb, int follow, int flags)
380 {
381 vnode_t *vp;
382 int error;
383 cred_t *cred;
384 int link_follow;
385 int estale_retry = 0;
386
387 link_follow = (follow == AT_SYMLINK_NOFOLLOW) ? NO_FOLLOW : FOLLOW;
388 lookup:
389 if (error = cstatat_getvp(fd, name, link_follow, &vp, &cred))
390 return (set_errno(error));
391 error = cstat32(vp, sb, flags, cred);
392 crfree(cred);
393 VN_RELE(vp);
394 if (error != 0) {
395 if (error == ESTALE &&
396 fs_need_estale_retry(estale_retry++))
397 goto lookup;
398 return (set_errno(error));
399 }
400 return (0);
401 }
402
403 #endif /* _SYSCALL32_IMPL */
404
405 #if defined(_ILP32)
406
407 /*
408 * 32-bit kernel, 32-bit applications, 64-bit file offsets.
409 *
410 * These routines are implemented differently on 64-bit kernels.
411 */
412 static int cstatat64(int, char *, struct stat64 *, int, int);
413 static int cstat64(vnode_t *, struct stat64 *, int, cred_t *);
414
415 int
416 fstat64(int fd, struct stat64 *sb)
417 {
418 FSTAT_BODY(fd, sb, cstat64)
419 }
420
421 int
422 fstatat64(int fd, char *name, struct stat64 *sb, int flags)
423 {
424 int followflag;
425 int csflags;
426
427 if (name == NULL)
428 return (fstat64(fd, sb));
429
430 followflag = (flags & AT_SYMLINK_NOFOLLOW);
431 csflags = (flags & _AT_TRIGGER ? ATTR_TRIGGER : 0);
432 if (followflag == 0)
433 csflags |= ATTR_REAL; /* flag for procfs lookups */
434
435 return (cstatat64(fd, name, sb, followflag, csflags));
436 }
437
438 int
439 stat64(char *name, struct stat64 *sb)
440 {
441 return (fstatat64(AT_FDCWD, name, sb, 0));
442 }
443
444 int
445 lstat64(char *name, struct stat64 *sb)
446 {
447 return (fstatat64(AT_FDCWD, name, sb, AT_SYMLINK_NOFOLLOW));
448 }
449
450 static int
451 cstat64(vnode_t *vp, struct stat64 *ubp, int flag, cred_t *cr)
452 {
453 struct vfssw *vswp;
454 struct stat64 lsb;
455 vattr_t vattr;
456 int error;
457
458 vattr.va_mask = AT_STAT | AT_NBLOCKS | AT_BLKSIZE | AT_SIZE;
459 if (error = VOP_GETATTR(vp, &vattr, flag, cr, NULL))
460 return (error);
461
462 bzero(&lsb, sizeof (lsb));
463 lsb.st_dev = vattr.va_fsid;
464 lsb.st_ino = vattr.va_nodeid;
465 lsb.st_mode = VTTOIF(vattr.va_type) | vattr.va_mode;
466 lsb.st_nlink = vattr.va_nlink;
467 lsb.st_uid = vattr.va_uid;
468 lsb.st_gid = vattr.va_gid;
469 lsb.st_rdev = vattr.va_rdev;
470 lsb.st_size = vattr.va_size;
471 lsb.st_atim = vattr.va_atime;
472 lsb.st_mtim = vattr.va_mtime;
473 lsb.st_ctim = vattr.va_ctime;
474 lsb.st_blksize = vattr.va_blksize;
475 lsb.st_blocks = vattr.va_nblocks;
476 if (vp->v_vfsp != NULL) {
477 vswp = &vfssw[vp->v_vfsp->vfs_fstype];
478 if (vswp->vsw_name && *vswp->vsw_name)
479 (void) strcpy(lsb.st_fstype, vswp->vsw_name);
480 }
481 if (copyout(&lsb, ubp, sizeof (lsb)))
482 return (EFAULT);
483 return (0);
484 }
485
486 static int
487 cstatat64(int fd, char *name, struct stat64 *sb, int follow, int flags)
488 {
489 vnode_t *vp;
490 int error;
491 cred_t *cred;
492 int link_follow;
493 int estale_retry = 0;
494
495 link_follow = (follow == AT_SYMLINK_NOFOLLOW) ? NO_FOLLOW : FOLLOW;
496 lookup:
497 if (error = cstatat_getvp(fd, name, link_follow, &vp, &cred))
498 return (set_errno(error));
499 error = cstat64(vp, sb, flags, cred);
500 crfree(cred);
501 VN_RELE(vp);
502 if (error != 0) {
503 if (error == ESTALE &&
504 fs_need_estale_retry(estale_retry++))
505 goto lookup;
506 return (set_errno(error));
507 }
508 return (0);
509 }
510
511 #endif /* _ILP32 */
512
513 #if defined(_SYSCALL32_IMPL)
514
515 /*
516 * 64-bit kernel, 32-bit applications, 64-bit file offsets.
517 *
518 * We'd really like to call the "native" stat calls for these ones,
519 * but the problem is that the 64-bit ABI defines the 'stat64' structure
520 * differently from the way the 32-bit ABI defines it.
521 */
522
523 static int cstatat64_32(int, char *, struct stat64_32 *, int, int);
524 static int cstat64_32(vnode_t *, struct stat64_32 *, int, cred_t *);
525
526 int
527 fstat64_32(int fd, struct stat64_32 *sb)
528 {
529 FSTAT_BODY(fd, sb, cstat64_32)
530 }
531
532 int
533 fstatat64_32(int fd, char *name, struct stat64_32 *sb, int flags)
534 {
535 int followflag;
536 int csflags;
537
538 if (name == NULL)
539 return (fstat64_32(fd, sb));
540
541 followflag = (flags & AT_SYMLINK_NOFOLLOW);
542 csflags = (flags & _AT_TRIGGER ? ATTR_TRIGGER : 0);
543 if (followflag == 0)
544 csflags |= ATTR_REAL; /* flag for procfs lookups */
545
546 return (cstatat64_32(fd, name, sb, followflag, csflags));
547 }
548
549 int
550 stat64_32(char *name, struct stat64_32 *sb)
551 {
552 return (fstatat64_32(AT_FDCWD, name, sb, 0));
553 }
554
555 int
556 lstat64_32(char *name, struct stat64_32 *sb)
557 {
558 return (fstatat64_32(AT_FDCWD, name, sb, AT_SYMLINK_NOFOLLOW));
559 }
560
561 static int
562 cstat64_32(vnode_t *vp, struct stat64_32 *ubp, int flag, cred_t *cr)
563 {
564 struct vfssw *vswp;
565 struct stat64_32 lsb;
566 vattr_t vattr;
567 int error;
568 dev32_t st_dev, st_rdev;
569
570 vattr.va_mask = AT_STAT | AT_NBLOCKS | AT_BLKSIZE | AT_SIZE;
571 if (error = VOP_GETATTR(vp, &vattr, flag, cr, NULL))
572 return (error);
573
574 if (!cmpldev(&st_dev, vattr.va_fsid) ||
575 !cmpldev(&st_rdev, vattr.va_rdev) ||
576 TIMESPEC_OVERFLOW(&(vattr.va_atime)) ||
577 TIMESPEC_OVERFLOW(&(vattr.va_mtime)) ||
578 TIMESPEC_OVERFLOW(&(vattr.va_ctime)))
579 return (EOVERFLOW);
580
581 bzero(&lsb, sizeof (lsb));
582 lsb.st_dev = st_dev;
583 lsb.st_ino = vattr.va_nodeid;
584 lsb.st_mode = VTTOIF(vattr.va_type) | vattr.va_mode;
585 lsb.st_nlink = vattr.va_nlink;
586 lsb.st_uid = vattr.va_uid;
587 lsb.st_gid = vattr.va_gid;
588 lsb.st_rdev = st_rdev;
589 lsb.st_size = vattr.va_size;
590 TIMESPEC_TO_TIMESPEC32(&(lsb.st_atim), &(vattr.va_atime));
591 TIMESPEC_TO_TIMESPEC32(&(lsb.st_mtim), &(vattr.va_mtime));
592 TIMESPEC_TO_TIMESPEC32(&(lsb.st_ctim), &(vattr.va_ctime));
593 lsb.st_blksize = vattr.va_blksize;
594 lsb.st_blocks = vattr.va_nblocks;
595 if (vp->v_vfsp != NULL) {
596 vswp = &vfssw[vp->v_vfsp->vfs_fstype];
597 if (vswp->vsw_name && *vswp->vsw_name)
598 (void) strcpy(lsb.st_fstype, vswp->vsw_name);
599 }
600 if (copyout(&lsb, ubp, sizeof (lsb)))
601 return (EFAULT);
602 return (0);
603 }
604
605 static int
606 cstatat64_32(int fd, char *name, struct stat64_32 *sb, int follow, int flags)
607 {
608 vnode_t *vp;
609 int error;
610 cred_t *cred;
611 int link_follow;
612 int estale_retry = 0;
613
614 link_follow = (follow == AT_SYMLINK_NOFOLLOW) ? NO_FOLLOW : FOLLOW;
615 lookup:
616 if (error = cstatat_getvp(fd, name, link_follow, &vp, &cred))
617 return (set_errno(error));
618 error = cstat64_32(vp, sb, flags, cred);
619 crfree(cred);
620 VN_RELE(vp);
621 if (error != 0) {
622 if (error == ESTALE &&
623 fs_need_estale_retry(estale_retry++))
624 goto lookup;
625 return (set_errno(error));
626 }
627 return (0);
628 }
629
630 #endif /* _SYSCALL32_IMPL */