1 /*-
2 * Copyright (c) 1994-1995 Søren Schmidt
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/7.4/sys/compat/linux/linux_stats.c 175183 2008-01-09 15:30:34Z kib $");
31
32 #include "opt_compat.h"
33 #include "opt_mac.h"
34
35 #include <sys/param.h>
36 #include <sys/dirent.h>
37 #include <sys/file.h>
38 #include <sys/filedesc.h>
39 #include <sys/proc.h>
40 #include <sys/jail.h>
41 #include <sys/malloc.h>
42 #include <sys/mount.h>
43 #include <sys/namei.h>
44 #include <sys/stat.h>
45 #include <sys/syscallsubr.h>
46 #include <sys/systm.h>
47 #include <sys/vnode.h>
48 #include <sys/conf.h>
49 #include <sys/fcntl.h>
50
51 #ifdef COMPAT_LINUX32
52 #include <machine/../linux32/linux.h>
53 #include <machine/../linux32/linux32_proto.h>
54 #else
55 #include <machine/../linux/linux.h>
56 #include <machine/../linux/linux_proto.h>
57 #endif
58
59 #include <compat/linux/linux_util.h>
60
61 #include <security/mac/mac_framework.h>
62
63 /*
64 * XXX: This was removed from newstat_copyout(), and almost identical
65 * XXX: code was in stat64_copyout(). findcdev() needs to be replaced
66 * XXX: with something that does lookup and locking properly.
67 * XXX: When somebody fixes this: please try to avoid duplicating it.
68 */
69 #if 0
70 static void
71 disk_foo(struct somestat *tbuf)
72 {
73 struct cdevsw *cdevsw;
74 struct cdev *dev;
75
76 /* Lie about disk drives which are character devices
77 * in FreeBSD but block devices under Linux.
78 */
79 if (S_ISCHR(tbuf.st_mode) &&
80 (dev = findcdev(buf->st_rdev)) != NULL) {
81 cdevsw = dev_refthread(dev);
82 if (cdevsw != NULL) {
83 if (cdevsw->d_flags & D_DISK) {
84 tbuf.st_mode &= ~S_IFMT;
85 tbuf.st_mode |= S_IFBLK;
86
87 /* XXX this may not be quite right */
88 /* Map major number to 0 */
89 tbuf.st_dev = uminor(buf->st_dev) & 0xf;
90 tbuf.st_rdev = buf->st_rdev & 0xff;
91 }
92 dev_relthread(dev);
93 }
94 }
95
96 }
97 #endif
98
99 static void
100 translate_fd_major_minor(struct thread *td, int fd, struct stat *buf)
101 {
102 struct file *fp;
103 int major, minor;
104
105 if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) ||
106 fget(td, fd, &fp) != 0)
107 return;
108 if (fp->f_vnode != NULL &&
109 fp->f_vnode->v_un.vu_cdev != NULL &&
110 linux_driver_get_major_minor(fp->f_vnode->v_un.vu_cdev->si_name,
111 &major, &minor) == 0)
112 buf->st_rdev = (major << 8 | minor);
113 fdrop(fp, td);
114 }
115
116 static void
117 translate_path_major_minor(struct thread *td, char *path, struct stat *buf)
118 {
119 struct proc *p = td->td_proc;
120 struct filedesc *fdp = p->p_fd;
121 int fd;
122 int temp;
123
124 if (!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode))
125 return;
126 temp = td->td_retval[0];
127 if (kern_open(td, path, UIO_SYSSPACE, O_RDONLY, 0) != 0)
128 return;
129 fd = td->td_retval[0];
130 td->td_retval[0] = temp;
131 translate_fd_major_minor(td, fd, buf);
132 fdclose(fdp, fdp->fd_ofiles[fd], fd, td);
133 }
134
135 static int
136 newstat_copyout(struct stat *buf, void *ubuf)
137 {
138 struct l_newstat tbuf;
139
140 bzero(&tbuf, sizeof(tbuf));
141 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
142 tbuf.st_ino = buf->st_ino;
143 tbuf.st_mode = buf->st_mode;
144 tbuf.st_nlink = buf->st_nlink;
145 tbuf.st_uid = buf->st_uid;
146 tbuf.st_gid = buf->st_gid;
147 tbuf.st_rdev = buf->st_rdev;
148 tbuf.st_size = buf->st_size;
149 tbuf.st_atime = buf->st_atime;
150 tbuf.st_mtime = buf->st_mtime;
151 tbuf.st_ctime = buf->st_ctime;
152 tbuf.st_blksize = buf->st_blksize;
153 tbuf.st_blocks = buf->st_blocks;
154
155 return (copyout(&tbuf, ubuf, sizeof(tbuf)));
156 }
157
158 int
159 linux_newstat(struct thread *td, struct linux_newstat_args *args)
160 {
161 struct stat buf;
162 char *path;
163 int error;
164
165 LCONVPATHEXIST(td, args->path, &path);
166
167 #ifdef DEBUG
168 if (ldebug(newstat))
169 printf(ARGS(newstat, "%s, *"), path);
170 #endif
171
172 error = kern_stat(td, path, UIO_SYSSPACE, &buf);
173 if (!error) {
174 if (strlen(path) > strlen("/dev/pts/") &&
175 !strncmp(path, "/dev/pts/", strlen("/dev/pts/")) &&
176 path[9] >= '' && path[9] <= '9') {
177 /*
178 * Linux checks major and minors of the slave device
179 * to make sure it's a pty device, so let's make him
180 * believe it is.
181 */
182 buf.st_rdev = (136 << 8);
183 } else
184 translate_path_major_minor(td, path, &buf);
185 }
186 LFREEPATH(path);
187 if (error)
188 return (error);
189 return (newstat_copyout(&buf, args->buf));
190 }
191
192 int
193 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
194 {
195 struct stat sb;
196 char *path;
197 int error;
198
199 LCONVPATHEXIST(td, args->path, &path);
200
201 #ifdef DEBUG
202 if (ldebug(newlstat))
203 printf(ARGS(newlstat, "%s, *"), path);
204 #endif
205
206 error = kern_lstat(td, path, UIO_SYSSPACE, &sb);
207 if (!error)
208 translate_path_major_minor(td, path, &sb);
209 LFREEPATH(path);
210 if (error)
211 return (error);
212 return (newstat_copyout(&sb, args->buf));
213 }
214
215 int
216 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
217 {
218 struct stat buf;
219 int error;
220
221 #ifdef DEBUG
222 if (ldebug(newfstat))
223 printf(ARGS(newfstat, "%d, *"), args->fd);
224 #endif
225
226 error = kern_fstat(td, args->fd, &buf);
227 translate_fd_major_minor(td, args->fd, &buf);
228 if (!error)
229 error = newstat_copyout(&buf, args->buf);
230
231 return (error);
232 }
233
234 static int
235 stat_copyout(struct stat *buf, void *ubuf)
236 {
237 struct l_stat lbuf;
238
239 bzero(&lbuf, sizeof(lbuf));
240 lbuf.st_dev = buf->st_dev;
241 lbuf.st_ino = buf->st_ino;
242 lbuf.st_mode = buf->st_mode;
243 lbuf.st_nlink = buf->st_nlink;
244 lbuf.st_uid = buf->st_uid;
245 lbuf.st_gid = buf->st_gid;
246 lbuf.st_rdev = buf->st_rdev;
247 if (buf->st_size < (quad_t)1 << 32)
248 lbuf.st_size = buf->st_size;
249 else
250 lbuf.st_size = -2;
251 lbuf.st_atime = buf->st_atime;
252 lbuf.st_mtime = buf->st_mtime;
253 lbuf.st_ctime = buf->st_ctime;
254 lbuf.st_blksize = buf->st_blksize;
255 lbuf.st_blocks = buf->st_blocks;
256 lbuf.st_flags = buf->st_flags;
257 lbuf.st_gen = buf->st_gen;
258
259 return (copyout(&lbuf, ubuf, sizeof(lbuf)));
260 }
261
262 int
263 linux_stat(struct thread *td, struct linux_stat_args *args)
264 {
265 struct stat buf;
266 char *path;
267 int error;
268
269 LCONVPATHEXIST(td, args->path, &path);
270
271 #ifdef DEBUG
272 if (ldebug(stat))
273 printf(ARGS(stat, "%s, *"), path);
274 #endif
275 error = kern_stat(td, path, UIO_SYSSPACE, &buf);
276 if (error) {
277 LFREEPATH(path);
278 return (error);
279 }
280 translate_path_major_minor(td, path, &buf);
281 LFREEPATH(path);
282 return(stat_copyout(&buf, args->up));
283 }
284
285 int
286 linux_lstat(struct thread *td, struct linux_lstat_args *args)
287 {
288 struct stat buf;
289 char *path;
290 int error;
291
292 LCONVPATHEXIST(td, args->path, &path);
293
294 #ifdef DEBUG
295 if (ldebug(lstat))
296 printf(ARGS(lstat, "%s, *"), path);
297 #endif
298 error = kern_lstat(td, path, UIO_SYSSPACE, &buf);
299 if (error) {
300 LFREEPATH(path);
301 return (error);
302 }
303 translate_path_major_minor(td, path, &buf);
304 LFREEPATH(path);
305 return(stat_copyout(&buf, args->up));
306 }
307
308 /* XXX - All fields of type l_int are defined as l_long on i386 */
309 struct l_statfs {
310 l_int f_type;
311 l_int f_bsize;
312 l_int f_blocks;
313 l_int f_bfree;
314 l_int f_bavail;
315 l_int f_files;
316 l_int f_ffree;
317 l_fsid_t f_fsid;
318 l_int f_namelen;
319 l_int f_spare[6];
320 };
321
322 #define LINUX_CODA_SUPER_MAGIC 0x73757245L
323 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L
324 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L
325 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L
326 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
327 #define LINUX_NCP_SUPER_MAGIC 0x564cL
328 #define LINUX_NFS_SUPER_MAGIC 0x6969L
329 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL
330 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L
331 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */
332 #define LINUX_DEVFS_SUPER_MAGIC 0x1373L
333
334 static long
335 bsd_to_linux_ftype(const char *fstypename)
336 {
337 int i;
338 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
339 {"ufs", LINUX_UFS_SUPER_MAGIC},
340 {"cd9660", LINUX_ISOFS_SUPER_MAGIC},
341 {"nfs", LINUX_NFS_SUPER_MAGIC},
342 {"ext2fs", LINUX_EXT2_SUPER_MAGIC},
343 {"procfs", LINUX_PROC_SUPER_MAGIC},
344 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
345 {"ntfs", LINUX_NTFS_SUPER_MAGIC},
346 {"nwfs", LINUX_NCP_SUPER_MAGIC},
347 {"hpfs", LINUX_HPFS_SUPER_MAGIC},
348 {"coda", LINUX_CODA_SUPER_MAGIC},
349 {"devfs", LINUX_DEVFS_SUPER_MAGIC},
350 {NULL, 0L}};
351
352 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
353 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
354 return (b2l_tbl[i].linux_type);
355
356 return (0L);
357 }
358
359 static void
360 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
361 {
362
363 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
364 linux_statfs->f_bsize = bsd_statfs->f_bsize;
365 linux_statfs->f_blocks = bsd_statfs->f_blocks;
366 linux_statfs->f_bfree = bsd_statfs->f_bfree;
367 linux_statfs->f_bavail = bsd_statfs->f_bavail;
368 linux_statfs->f_ffree = bsd_statfs->f_ffree;
369 linux_statfs->f_files = bsd_statfs->f_files;
370 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
371 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
372 linux_statfs->f_namelen = MAXNAMLEN;
373 }
374
375 int
376 linux_statfs(struct thread *td, struct linux_statfs_args *args)
377 {
378 struct l_statfs linux_statfs;
379 struct statfs bsd_statfs;
380 char *path;
381 int error;
382
383 LCONVPATHEXIST(td, args->path, &path);
384
385 #ifdef DEBUG
386 if (ldebug(statfs))
387 printf(ARGS(statfs, "%s, *"), path);
388 #endif
389 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
390 LFREEPATH(path);
391 if (error)
392 return (error);
393 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
394 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
395 }
396
397 static void
398 bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs)
399 {
400
401 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
402 linux_statfs->f_bsize = bsd_statfs->f_bsize;
403 linux_statfs->f_blocks = bsd_statfs->f_blocks;
404 linux_statfs->f_bfree = bsd_statfs->f_bfree;
405 linux_statfs->f_bavail = bsd_statfs->f_bavail;
406 linux_statfs->f_ffree = bsd_statfs->f_ffree;
407 linux_statfs->f_files = bsd_statfs->f_files;
408 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
409 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
410 linux_statfs->f_namelen = MAXNAMLEN;
411 }
412
413 int
414 linux_statfs64(struct thread *td, struct linux_statfs64_args *args)
415 {
416 struct l_statfs64 linux_statfs;
417 struct statfs bsd_statfs;
418 char *path;
419 int error;
420
421 if (args->bufsize != sizeof(struct l_statfs64))
422 return EINVAL;
423
424 LCONVPATHEXIST(td, args->path, &path);
425
426 #ifdef DEBUG
427 if (ldebug(statfs64))
428 printf(ARGS(statfs64, "%s, *"), path);
429 #endif
430 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
431 LFREEPATH(path);
432 if (error)
433 return (error);
434 bsd_to_linux_statfs64(&bsd_statfs, &linux_statfs);
435 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
436 }
437
438 int
439 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
440 {
441 struct l_statfs linux_statfs;
442 struct statfs bsd_statfs;
443 int error;
444
445 #ifdef DEBUG
446 if (ldebug(fstatfs))
447 printf(ARGS(fstatfs, "%d, *"), args->fd);
448 #endif
449 error = kern_fstatfs(td, args->fd, &bsd_statfs);
450 if (error)
451 return error;
452 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
453 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
454 }
455
456 struct l_ustat
457 {
458 l_daddr_t f_tfree;
459 l_ino_t f_tinode;
460 char f_fname[6];
461 char f_fpack[6];
462 };
463
464 int
465 linux_ustat(struct thread *td, struct linux_ustat_args *args)
466 {
467 #ifdef DEBUG
468 if (ldebug(ustat))
469 printf(ARGS(ustat, "%d, *"), args->dev);
470 #endif
471
472 return (EOPNOTSUPP);
473 }
474
475 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
476
477 static int
478 stat64_copyout(struct stat *buf, void *ubuf)
479 {
480 struct l_stat64 lbuf;
481
482 bzero(&lbuf, sizeof(lbuf));
483 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
484 lbuf.st_ino = buf->st_ino;
485 lbuf.st_mode = buf->st_mode;
486 lbuf.st_nlink = buf->st_nlink;
487 lbuf.st_uid = buf->st_uid;
488 lbuf.st_gid = buf->st_gid;
489 lbuf.st_rdev = buf->st_rdev;
490 lbuf.st_size = buf->st_size;
491 lbuf.st_atime = buf->st_atime;
492 lbuf.st_mtime = buf->st_mtime;
493 lbuf.st_ctime = buf->st_ctime;
494 lbuf.st_blksize = buf->st_blksize;
495 lbuf.st_blocks = buf->st_blocks;
496
497 /*
498 * The __st_ino field makes all the difference. In the Linux kernel
499 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
500 * but without the assignment to __st_ino the runtime linker refuses
501 * to mmap(2) any shared libraries. I guess it's broken alright :-)
502 */
503 lbuf.__st_ino = buf->st_ino;
504
505 return (copyout(&lbuf, ubuf, sizeof(lbuf)));
506 }
507
508 int
509 linux_stat64(struct thread *td, struct linux_stat64_args *args)
510 {
511 struct stat buf;
512 char *filename;
513 int error;
514
515 LCONVPATHEXIST(td, args->filename, &filename);
516
517 #ifdef DEBUG
518 if (ldebug(stat64))
519 printf(ARGS(stat64, "%s, *"), filename);
520 #endif
521
522 error = kern_stat(td, filename, UIO_SYSSPACE, &buf);
523 if (!error) {
524 if (strlen(filename) > strlen("/dev/pts/") &&
525 !strncmp(filename, "/dev/pts/", strlen("/dev/pts/")) &&
526 filename[9] >= '' && filename[9] <= '9') {
527 /*
528 * Linux checks major and minors of the slave device
529 * to make sure it's a pty deivce, so let's make him
530 * believe it is.
531 */
532 buf.st_rdev = (136 << 8);
533 } else
534 translate_path_major_minor(td, filename, &buf);
535 }
536 LFREEPATH(filename);
537 if (error)
538 return (error);
539 return (stat64_copyout(&buf, args->statbuf));
540 }
541
542 int
543 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
544 {
545 struct stat sb;
546 char *filename;
547 int error;
548
549 LCONVPATHEXIST(td, args->filename, &filename);
550
551 #ifdef DEBUG
552 if (ldebug(lstat64))
553 printf(ARGS(lstat64, "%s, *"), args->filename);
554 #endif
555
556 error = kern_lstat(td, filename, UIO_SYSSPACE, &sb);
557 if (!error)
558 translate_path_major_minor(td, filename, &sb);
559 LFREEPATH(filename);
560 if (error)
561 return (error);
562 return (stat64_copyout(&sb, args->statbuf));
563 }
564
565 int
566 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
567 {
568 struct stat buf;
569 int error;
570
571 #ifdef DEBUG
572 if (ldebug(fstat64))
573 printf(ARGS(fstat64, "%d, *"), args->fd);
574 #endif
575
576 error = kern_fstat(td, args->fd, &buf);
577 translate_fd_major_minor(td, args->fd, &buf);
578 if (!error)
579 error = stat64_copyout(&buf, args->statbuf);
580
581 return (error);
582 }
583
584 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
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