1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1994-1995 Søren Schmidt
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "opt_ktrace.h"
30
31 #include <sys/param.h>
32 #include <sys/capsicum.h>
33 #include <sys/dirent.h>
34 #include <sys/lock.h>
35 #include <sys/malloc.h>
36 #include <sys/mutex.h>
37 #include <sys/namei.h>
38 #include <sys/proc.h>
39 #include <sys/stat.h>
40 #include <sys/syscallsubr.h>
41 #include <sys/tty.h>
42 #include <sys/vnode.h>
43 #ifdef KTRACE
44 #include <sys/ktrace.h>
45 #endif
46
47 #include <security/audit/audit.h>
48
49 #ifdef COMPAT_LINUX32
50 #include <machine/../linux32/linux.h>
51 #include <machine/../linux32/linux32_proto.h>
52 #else
53 #include <machine/../linux/linux.h>
54 #include <machine/../linux/linux_proto.h>
55 #endif
56
57 #include <compat/linux/linux.h>
58 #include <compat/linux/linux_file.h>
59 #include <compat/linux/linux_util.h>
60
61 /*
62 * Linux dev_t conversion routines.
63 *
64 * As of version 2.6.0 of the Linux kernel, dev_t is a 32-bit quantity
65 * with 12 bits set asaid for the major number and 20 for the minor number.
66 * The in-kernel dev_t encoded as MMMmmmmm, where M is a hex digit of the
67 * major number and m is a hex digit of the minor number.
68 * The user-space dev_t encoded as mmmM MMmm, where M and m is the major
69 * and minor numbers accordingly. This is downward compatible with legacy
70 * systems where dev_t is 16 bits wide, encoded as MMmm.
71 * In glibc dev_t is a 64-bit quantity, with 32-bit major and minor numbers,
72 * encoded as MMMM Mmmm mmmM MMmm. This is downward compatible with the Linux
73 * kernel and with legacy systems where dev_t is 16 bits wide.
74 *
75 * In the FreeBSD dev_t is a 64-bit quantity. The major and minor numbers
76 * are encoded as MMMmmmMm, therefore conversion of the device numbers between
77 * Linux user-space and FreeBSD kernel required.
78 */
79 static l_dev_t
linux_encode_dev(int _major,int _minor)80 linux_encode_dev(int _major, int _minor)
81 {
82
83 return ((_minor & 0xff) | ((_major & 0xfff) << 8) |
84 (((_minor & ~0xff) << 12) & 0xfff00000));
85 }
86
87 static l_dev_t
linux_new_encode_dev(dev_t _dev)88 linux_new_encode_dev(dev_t _dev)
89 {
90
91 return (_dev == NODEV ? 0 : linux_encode_dev(major(_dev), minor(_dev)));
92 }
93
94 static int
linux_encode_major(dev_t _dev)95 linux_encode_major(dev_t _dev)
96 {
97
98 return (_dev == NODEV ? 0 : major(_dev) & 0xfff);
99 }
100
101 static int
linux_encode_minor(dev_t _dev)102 linux_encode_minor(dev_t _dev)
103 {
104
105 return (_dev == NODEV ? 0 : minor(_dev) & 0xfffff);
106 }
107
108 static int
linux_kern_fstat(struct thread * td,int fd,struct stat * sbp)109 linux_kern_fstat(struct thread *td, int fd, struct stat *sbp)
110 {
111 struct vnode *vp;
112 struct file *fp;
113 int error;
114
115 AUDIT_ARG_FD(fd);
116
117 error = fget(td, fd, &cap_fstat_rights, &fp);
118 if (__predict_false(error != 0))
119 return (error);
120
121 AUDIT_ARG_FILE(td->td_proc, fp);
122
123 error = fo_stat(fp, sbp, td->td_ucred);
124 if (error == 0 && (vp = fp->f_vnode) != NULL)
125 translate_vnhook_major_minor(vp, sbp);
126 fdrop(fp, td);
127 #ifdef KTRACE
128 if (KTRPOINT(td, KTR_STRUCT))
129 ktrstat_error(sbp, error);
130 #endif
131 return (error);
132 }
133
134 static int
linux_kern_statat(struct thread * td,int flag,int fd,const char * path,enum uio_seg pathseg,struct stat * sbp)135 linux_kern_statat(struct thread *td, int flag, int fd, const char *path,
136 enum uio_seg pathseg, struct stat *sbp)
137 {
138 struct nameidata nd;
139 int error;
140
141 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
142 AT_EMPTY_PATH)) != 0)
143 return (EINVAL);
144
145 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH |
146 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF |
147 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights);
148
149 if ((error = namei(&nd)) != 0) {
150 if (error == ENOTDIR &&
151 (nd.ni_resflags & NIRES_EMPTYPATH) != 0)
152 error = linux_kern_fstat(td, fd, sbp);
153 return (error);
154 }
155 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED);
156 if (error == 0)
157 translate_vnhook_major_minor(nd.ni_vp, sbp);
158 NDFREE_PNBUF(&nd);
159 vput(nd.ni_vp);
160 #ifdef KTRACE
161 if (KTRPOINT(td, KTR_STRUCT))
162 ktrstat_error(sbp, error);
163 #endif
164 return (error);
165 }
166
167 #ifdef LINUX_LEGACY_SYSCALLS
168 static int
linux_kern_stat(struct thread * td,const char * path,enum uio_seg pathseg,struct stat * sbp)169 linux_kern_stat(struct thread *td, const char *path, enum uio_seg pathseg,
170 struct stat *sbp)
171 {
172
173 return (linux_kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
174 }
175
176 static int
linux_kern_lstat(struct thread * td,const char * path,enum uio_seg pathseg,struct stat * sbp)177 linux_kern_lstat(struct thread *td, const char *path, enum uio_seg pathseg,
178 struct stat *sbp)
179 {
180
181 return (linux_kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
182 pathseg, sbp));
183 }
184 #endif
185
186 static int
newstat_copyout(struct stat * buf,void * ubuf)187 newstat_copyout(struct stat *buf, void *ubuf)
188 {
189 struct l_newstat tbuf;
190
191 bzero(&tbuf, sizeof(tbuf));
192 tbuf.st_dev = linux_new_encode_dev(buf->st_dev);
193 tbuf.st_ino = buf->st_ino;
194 tbuf.st_mode = buf->st_mode;
195 tbuf.st_nlink = buf->st_nlink;
196 tbuf.st_uid = buf->st_uid;
197 tbuf.st_gid = buf->st_gid;
198 tbuf.st_rdev = linux_new_encode_dev(buf->st_rdev);
199 tbuf.st_size = buf->st_size;
200 tbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
201 tbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
202 tbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
203 tbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
204 tbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
205 tbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
206 tbuf.st_blksize = buf->st_blksize;
207 tbuf.st_blocks = buf->st_blocks;
208
209 return (copyout(&tbuf, ubuf, sizeof(tbuf)));
210 }
211
212
213 #ifdef LINUX_LEGACY_SYSCALLS
214 int
linux_newstat(struct thread * td,struct linux_newstat_args * args)215 linux_newstat(struct thread *td, struct linux_newstat_args *args)
216 {
217 struct stat buf;
218 int error;
219
220 error = linux_kern_stat(td, args->path, UIO_USERSPACE, &buf);
221 if (error)
222 return (error);
223 return (newstat_copyout(&buf, args->buf));
224 }
225
226 int
linux_newlstat(struct thread * td,struct linux_newlstat_args * args)227 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
228 {
229 struct stat sb;
230 int error;
231
232 error = linux_kern_lstat(td, args->path, UIO_USERSPACE, &sb);
233 if (error)
234 return (error);
235 return (newstat_copyout(&sb, args->buf));
236 }
237 #endif
238
239 int
linux_newfstat(struct thread * td,struct linux_newfstat_args * args)240 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
241 {
242 struct stat buf;
243 int error;
244
245 error = linux_kern_fstat(td, args->fd, &buf);
246 if (!error)
247 error = newstat_copyout(&buf, args->buf);
248
249 return (error);
250 }
251
252 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
253
254 static __inline uint16_t
linux_old_encode_dev(dev_t _dev)255 linux_old_encode_dev(dev_t _dev)
256 {
257
258 return (_dev == NODEV ? 0 : linux_encode_dev(major(_dev), minor(_dev)));
259 }
260
261 static int
old_stat_copyout(struct stat * buf,void * ubuf)262 old_stat_copyout(struct stat *buf, void *ubuf)
263 {
264 struct l_old_stat lbuf;
265
266 bzero(&lbuf, sizeof(lbuf));
267 lbuf.st_dev = linux_old_encode_dev(buf->st_dev);
268 lbuf.st_ino = buf->st_ino;
269 lbuf.st_mode = buf->st_mode;
270 lbuf.st_nlink = buf->st_nlink;
271 lbuf.st_uid = buf->st_uid;
272 lbuf.st_gid = buf->st_gid;
273 lbuf.st_rdev = linux_old_encode_dev(buf->st_rdev);
274 lbuf.st_size = MIN(buf->st_size, INT32_MAX);
275 lbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
276 lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
277 lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
278 lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
279 lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
280 lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
281 lbuf.st_blksize = buf->st_blksize;
282 lbuf.st_blocks = buf->st_blocks;
283 lbuf.st_flags = buf->st_flags;
284 lbuf.st_gen = buf->st_gen;
285
286 return (copyout(&lbuf, ubuf, sizeof(lbuf)));
287 }
288
289 int
linux_stat(struct thread * td,struct linux_stat_args * args)290 linux_stat(struct thread *td, struct linux_stat_args *args)
291 {
292 struct stat buf;
293 int error;
294
295 error = linux_kern_stat(td, args->path, UIO_USERSPACE, &buf);
296 if (error) {
297 return (error);
298 }
299 return (old_stat_copyout(&buf, args->up));
300 }
301
302 int
linux_lstat(struct thread * td,struct linux_lstat_args * args)303 linux_lstat(struct thread *td, struct linux_lstat_args *args)
304 {
305 struct stat buf;
306 int error;
307
308 error = linux_kern_lstat(td, args->path, UIO_USERSPACE, &buf);
309 if (error) {
310 return (error);
311 }
312 return (old_stat_copyout(&buf, args->up));
313 }
314 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
315
316 struct l_statfs {
317 l_long f_type;
318 l_long f_bsize;
319 l_long f_blocks;
320 l_long f_bfree;
321 l_long f_bavail;
322 l_long f_files;
323 l_long f_ffree;
324 l_fsid_t f_fsid;
325 l_long f_namelen;
326 l_long f_frsize;
327 l_long f_flags;
328 l_long f_spare[4];
329 };
330
331 #define LINUX_CODA_SUPER_MAGIC 0x73757245L
332 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L
333 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L
334 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L
335 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
336 #define LINUX_NCP_SUPER_MAGIC 0x564cL
337 #define LINUX_NFS_SUPER_MAGIC 0x6969L
338 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL
339 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L
340 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */
341 #define LINUX_ZFS_SUPER_MAGIC 0x2FC12FC1
342 #define LINUX_DEVFS_SUPER_MAGIC 0x1373L
343 #define LINUX_SHMFS_MAGIC 0x01021994
344 #define LINUX_SYSFS_MAGIC 0x62656572
345
346 static long
bsd_to_linux_ftype(const char * fstypename)347 bsd_to_linux_ftype(const char *fstypename)
348 {
349 int i;
350 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
351 {"ufs", LINUX_UFS_SUPER_MAGIC},
352 {"zfs", LINUX_ZFS_SUPER_MAGIC},
353 {"cd9660", LINUX_ISOFS_SUPER_MAGIC},
354 {"nfs", LINUX_NFS_SUPER_MAGIC},
355 {"ext2fs", LINUX_EXT2_SUPER_MAGIC},
356 {"procfs", LINUX_PROC_SUPER_MAGIC},
357 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
358 {"ntfs", LINUX_NTFS_SUPER_MAGIC},
359 {"nwfs", LINUX_NCP_SUPER_MAGIC},
360 {"hpfs", LINUX_HPFS_SUPER_MAGIC},
361 {"coda", LINUX_CODA_SUPER_MAGIC},
362 {"devfs", LINUX_DEVFS_SUPER_MAGIC},
363 {"tmpfs", LINUX_SHMFS_MAGIC},
364 {"linsysfs", LINUX_SYSFS_MAGIC},
365 {NULL, 0L}};
366
367 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
368 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
369 return (b2l_tbl[i].linux_type);
370
371 return (0L);
372 }
373
374 static int
bsd_to_linux_mnt_flags(int f_flags)375 bsd_to_linux_mnt_flags(int f_flags)
376 {
377 int flags = LINUX_ST_VALID;
378
379 if (f_flags & MNT_RDONLY)
380 flags |= LINUX_ST_RDONLY;
381 if (f_flags & MNT_NOEXEC)
382 flags |= LINUX_ST_NOEXEC;
383 if (f_flags & MNT_NOSUID)
384 flags |= LINUX_ST_NOSUID;
385 if (f_flags & MNT_NOATIME)
386 flags |= LINUX_ST_NOATIME;
387 if (f_flags & MNT_NOSYMFOLLOW)
388 flags |= LINUX_ST_NOSYMFOLLOW;
389 if (f_flags & MNT_SYNCHRONOUS)
390 flags |= LINUX_ST_SYNCHRONOUS;
391
392 return (flags);
393 }
394
395 static int
bsd_to_linux_statfs(struct statfs * bsd_statfs,struct l_statfs * linux_statfs)396 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
397 {
398
399 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
400 statfs_scale_blocks(bsd_statfs, INT32_MAX);
401 #endif
402 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
403 linux_statfs->f_bsize = bsd_statfs->f_bsize;
404 linux_statfs->f_blocks = bsd_statfs->f_blocks;
405 linux_statfs->f_bfree = bsd_statfs->f_bfree;
406 linux_statfs->f_bavail = bsd_statfs->f_bavail;
407 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
408 linux_statfs->f_ffree = MIN(bsd_statfs->f_ffree, INT32_MAX);
409 linux_statfs->f_files = MIN(bsd_statfs->f_files, INT32_MAX);
410 #else
411 linux_statfs->f_ffree = bsd_statfs->f_ffree;
412 linux_statfs->f_files = bsd_statfs->f_files;
413 #endif
414 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
415 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
416 linux_statfs->f_namelen = MAXNAMLEN;
417 linux_statfs->f_frsize = bsd_statfs->f_bsize;
418 linux_statfs->f_flags = bsd_to_linux_mnt_flags(bsd_statfs->f_flags);
419 memset(linux_statfs->f_spare, 0, sizeof(linux_statfs->f_spare));
420
421 return (0);
422 }
423
424 int
linux_statfs(struct thread * td,struct linux_statfs_args * args)425 linux_statfs(struct thread *td, struct linux_statfs_args *args)
426 {
427 struct l_statfs linux_statfs;
428 struct statfs *bsd_statfs;
429 int error;
430
431 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
432 error = kern_statfs(td, args->path, UIO_USERSPACE, bsd_statfs);
433 if (error == 0)
434 error = bsd_to_linux_statfs(bsd_statfs, &linux_statfs);
435 free(bsd_statfs, M_STATFS);
436 if (error != 0)
437 return (error);
438 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
439 }
440
441 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
442 static void
bsd_to_linux_statfs64(struct statfs * bsd_statfs,struct l_statfs64 * linux_statfs)443 bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs)
444 {
445
446 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
447 linux_statfs->f_bsize = bsd_statfs->f_bsize;
448 linux_statfs->f_blocks = bsd_statfs->f_blocks;
449 linux_statfs->f_bfree = bsd_statfs->f_bfree;
450 linux_statfs->f_bavail = bsd_statfs->f_bavail;
451 linux_statfs->f_ffree = bsd_statfs->f_ffree;
452 linux_statfs->f_files = bsd_statfs->f_files;
453 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
454 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
455 linux_statfs->f_namelen = MAXNAMLEN;
456 linux_statfs->f_frsize = bsd_statfs->f_bsize;
457 linux_statfs->f_flags = bsd_to_linux_mnt_flags(bsd_statfs->f_flags);
458 memset(linux_statfs->f_spare, 0, sizeof(linux_statfs->f_spare));
459 }
460
461 int
linux_statfs64(struct thread * td,struct linux_statfs64_args * args)462 linux_statfs64(struct thread *td, struct linux_statfs64_args *args)
463 {
464 struct l_statfs64 linux_statfs;
465 struct statfs *bsd_statfs;
466 int error;
467
468 if (args->bufsize != sizeof(struct l_statfs64))
469 return (EINVAL);
470
471 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
472 error = kern_statfs(td, args->path, UIO_USERSPACE, bsd_statfs);
473 if (error == 0)
474 bsd_to_linux_statfs64(bsd_statfs, &linux_statfs);
475 free(bsd_statfs, M_STATFS);
476 if (error != 0)
477 return (error);
478 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
479 }
480
481 int
linux_fstatfs64(struct thread * td,struct linux_fstatfs64_args * args)482 linux_fstatfs64(struct thread *td, struct linux_fstatfs64_args *args)
483 {
484 struct l_statfs64 linux_statfs;
485 struct statfs *bsd_statfs;
486 int error;
487
488 if (args->bufsize != sizeof(struct l_statfs64))
489 return (EINVAL);
490
491 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
492 error = kern_fstatfs(td, args->fd, bsd_statfs);
493 if (error == 0)
494 bsd_to_linux_statfs64(bsd_statfs, &linux_statfs);
495 free(bsd_statfs, M_STATFS);
496 if (error != 0)
497 return (error);
498 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
499 }
500 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
501
502 int
linux_fstatfs(struct thread * td,struct linux_fstatfs_args * args)503 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
504 {
505 struct l_statfs linux_statfs;
506 struct statfs *bsd_statfs;
507 int error;
508
509 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
510 error = kern_fstatfs(td, args->fd, bsd_statfs);
511 if (error == 0)
512 error = bsd_to_linux_statfs(bsd_statfs, &linux_statfs);
513 free(bsd_statfs, M_STATFS);
514 if (error != 0)
515 return (error);
516 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
517 }
518
519 struct l_ustat
520 {
521 l_daddr_t f_tfree;
522 l_ino_t f_tinode;
523 char f_fname[6];
524 char f_fpack[6];
525 };
526
527 #ifdef LINUX_LEGACY_SYSCALLS
528 int
linux_ustat(struct thread * td,struct linux_ustat_args * args)529 linux_ustat(struct thread *td, struct linux_ustat_args *args)
530 {
531
532 return (EOPNOTSUPP);
533 }
534 #endif
535
536 /*
537 * Convert Linux stat flags to BSD flags. Return value indicates successful
538 * conversion (no unknown flags).
539 */
540 static bool
linux_to_bsd_stat_flags(int linux_flags,int * out_flags)541 linux_to_bsd_stat_flags(int linux_flags, int *out_flags)
542 {
543 int flags, unsupported;
544
545 unsupported = linux_flags & ~(LINUX_AT_SYMLINK_NOFOLLOW |
546 LINUX_AT_EMPTY_PATH | LINUX_AT_NO_AUTOMOUNT);
547 if (unsupported != 0) {
548 *out_flags = unsupported;
549 return (false);
550 }
551
552 flags = 0;
553 if (linux_flags & LINUX_AT_SYMLINK_NOFOLLOW)
554 flags |= AT_SYMLINK_NOFOLLOW;
555 if (linux_flags & LINUX_AT_EMPTY_PATH)
556 flags |= AT_EMPTY_PATH;
557 *out_flags = flags;
558 return (true);
559 }
560
561 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
562
563 static int
stat64_copyout(struct stat * buf,void * ubuf)564 stat64_copyout(struct stat *buf, void *ubuf)
565 {
566 struct l_stat64 lbuf;
567
568 bzero(&lbuf, sizeof(lbuf));
569 lbuf.st_dev = linux_new_encode_dev(buf->st_dev);
570 lbuf.st_ino = buf->st_ino;
571 lbuf.st_mode = buf->st_mode;
572 lbuf.st_nlink = buf->st_nlink;
573 lbuf.st_uid = buf->st_uid;
574 lbuf.st_gid = buf->st_gid;
575 lbuf.st_rdev = linux_new_encode_dev(buf->st_rdev);
576 lbuf.st_size = buf->st_size;
577 lbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
578 lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
579 lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
580 lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
581 lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
582 lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
583 lbuf.st_blksize = buf->st_blksize;
584 lbuf.st_blocks = buf->st_blocks;
585
586 /*
587 * The __st_ino field makes all the difference. In the Linux kernel
588 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
589 * but without the assignment to __st_ino the runtime linker refuses
590 * to mmap(2) any shared libraries. I guess it's broken alright :-)
591 */
592 lbuf.__st_ino = buf->st_ino;
593
594 return (copyout(&lbuf, ubuf, sizeof(lbuf)));
595 }
596
597 int
linux_stat64(struct thread * td,struct linux_stat64_args * args)598 linux_stat64(struct thread *td, struct linux_stat64_args *args)
599 {
600 struct stat buf;
601 int error;
602
603 error = linux_kern_stat(td, args->filename, UIO_USERSPACE, &buf);
604 if (error)
605 return (error);
606 return (stat64_copyout(&buf, args->statbuf));
607 }
608
609 int
linux_lstat64(struct thread * td,struct linux_lstat64_args * args)610 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
611 {
612 struct stat sb;
613 int error;
614
615 error = linux_kern_lstat(td, args->filename, UIO_USERSPACE, &sb);
616 if (error)
617 return (error);
618 return (stat64_copyout(&sb, args->statbuf));
619 }
620
621 int
linux_fstat64(struct thread * td,struct linux_fstat64_args * args)622 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
623 {
624 struct stat buf;
625 int error;
626
627 error = linux_kern_fstat(td, args->fd, &buf);
628 if (!error)
629 error = stat64_copyout(&buf, args->statbuf);
630
631 return (error);
632 }
633
634 int
linux_fstatat64(struct thread * td,struct linux_fstatat64_args * args)635 linux_fstatat64(struct thread *td, struct linux_fstatat64_args *args)
636 {
637 int error, dfd, flags;
638 struct stat buf;
639
640 if (!linux_to_bsd_stat_flags(args->flag, &flags)) {
641 linux_msg(td, "fstatat64 unsupported flags 0x%x", flags);
642 return (EINVAL);
643 }
644
645 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
646 error = linux_kern_statat(td, flags, dfd, args->pathname,
647 UIO_USERSPACE, &buf);
648 if (error == 0)
649 error = stat64_copyout(&buf, args->statbuf);
650
651 return (error);
652 }
653
654 #else /* __amd64__ && !COMPAT_LINUX32 */
655
656 int
linux_newfstatat(struct thread * td,struct linux_newfstatat_args * args)657 linux_newfstatat(struct thread *td, struct linux_newfstatat_args *args)
658 {
659 int error, dfd, flags;
660 struct stat buf;
661
662 if (!linux_to_bsd_stat_flags(args->flag, &flags)) {
663 linux_msg(td, "fstatat unsupported flags 0x%x", flags);
664 return (EINVAL);
665 }
666
667 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
668 error = linux_kern_statat(td, flags, dfd, args->pathname,
669 UIO_USERSPACE, &buf);
670 if (error == 0)
671 error = newstat_copyout(&buf, args->statbuf);
672
673 return (error);
674 }
675
676 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
677
678 int
linux_syncfs(struct thread * td,struct linux_syncfs_args * args)679 linux_syncfs(struct thread *td, struct linux_syncfs_args *args)
680 {
681 struct mount *mp;
682 struct vnode *vp;
683 int error, save;
684
685 error = fgetvp(td, args->fd, &cap_fsync_rights, &vp);
686 if (error != 0)
687 /*
688 * Linux syncfs() returns only EBADF, however fgetvp()
689 * can return EINVAL in case of file descriptor does
690 * not represent a vnode. XXX.
691 */
692 return (error);
693
694 mp = vp->v_mount;
695 mtx_lock(&mountlist_mtx);
696 error = vfs_busy(mp, MBF_MNTLSTLOCK);
697 if (error != 0) {
698 /* See comment above. */
699 mtx_unlock(&mountlist_mtx);
700 goto out;
701 }
702 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
703 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
704 save = curthread_pflags_set(TDP_SYNCIO);
705 vfs_periodic(mp, MNT_NOWAIT);
706 VFS_SYNC(mp, MNT_NOWAIT);
707 curthread_pflags_restore(save);
708 vn_finished_write(mp);
709 }
710 vfs_unbusy(mp);
711
712 out:
713 vrele(vp);
714 return (error);
715 }
716
717 static int
statx_copyout(struct stat * buf,void * ubuf)718 statx_copyout(struct stat *buf, void *ubuf)
719 {
720 struct l_statx tbuf;
721
722 bzero(&tbuf, sizeof(tbuf));
723 tbuf.stx_mask = STATX_ALL;
724 tbuf.stx_blksize = buf->st_blksize;
725 tbuf.stx_attributes = 0;
726 tbuf.stx_nlink = buf->st_nlink;
727 tbuf.stx_uid = buf->st_uid;
728 tbuf.stx_gid = buf->st_gid;
729 tbuf.stx_mode = buf->st_mode;
730 tbuf.stx_ino = buf->st_ino;
731 tbuf.stx_size = buf->st_size;
732 tbuf.stx_blocks = buf->st_blocks;
733
734 tbuf.stx_atime.tv_sec = buf->st_atim.tv_sec;
735 tbuf.stx_atime.tv_nsec = buf->st_atim.tv_nsec;
736 tbuf.stx_btime.tv_sec = buf->st_birthtim.tv_sec;
737 tbuf.stx_btime.tv_nsec = buf->st_birthtim.tv_nsec;
738 tbuf.stx_ctime.tv_sec = buf->st_ctim.tv_sec;
739 tbuf.stx_ctime.tv_nsec = buf->st_ctim.tv_nsec;
740 tbuf.stx_mtime.tv_sec = buf->st_mtim.tv_sec;
741 tbuf.stx_mtime.tv_nsec = buf->st_mtim.tv_nsec;
742 tbuf.stx_rdev_major = linux_encode_major(buf->st_rdev);
743 tbuf.stx_rdev_minor = linux_encode_minor(buf->st_rdev);
744 tbuf.stx_dev_major = linux_encode_major(buf->st_dev);
745 tbuf.stx_dev_minor = linux_encode_minor(buf->st_dev);
746
747 return (copyout(&tbuf, ubuf, sizeof(tbuf)));
748 }
749
750 int
linux_statx(struct thread * td,struct linux_statx_args * args)751 linux_statx(struct thread *td, struct linux_statx_args *args)
752 {
753 int error, dirfd, flags;
754 struct stat buf;
755
756 if (!linux_to_bsd_stat_flags(args->flags, &flags)) {
757 linux_msg(td, "statx unsupported flags 0x%x", flags);
758 return (EINVAL);
759 }
760
761 dirfd = (args->dirfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dirfd;
762 error = linux_kern_statat(td, flags, dirfd, args->pathname,
763 UIO_USERSPACE, &buf);
764 if (error == 0)
765 error = statx_copyout(&buf, args->statxbuf);
766
767 return (error);
768 }
769