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m68k: Cleanup linker scripts using new linker script macros.
[linux-2.6/libata-dev.git] / fs / compat.c
blob6c19040ffeefecdd520fc1093b5ed9db31e8aa7f
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/syscalls.h>
36 #include <linux/ctype.h>
37 #include <linux/module.h>
38 #include <linux/dirent.h>
39 #include <linux/fsnotify.h>
40 #include <linux/highuid.h>
41 #include <linux/sunrpc/svc.h>
42 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfsd/syscall.h>
44 #include <linux/personality.h>
45 #include <linux/rwsem.h>
46 #include <linux/tsacct_kern.h>
47 #include <linux/security.h>
48 #include <linux/highmem.h>
49 #include <linux/signal.h>
50 #include <linux/poll.h>
51 #include <linux/mm.h>
52 #include <linux/eventpoll.h>
53 #include <linux/fs_struct.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/mmu_context.h>
57 #include <asm/ioctls.h>
58 #include "internal.h"
59
60 int compat_log = 1;
61
62 int compat_printk(const char *fmt, ...)
63 {
64 va_list ap;
65 int ret;
66 if (!compat_log)
67 return 0;
68 va_start(ap, fmt);
69 ret = vprintk(fmt, ap);
70 va_end(ap);
71 return ret;
72 }
73
74 #include "read_write.h"
75
76 /*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
81 {
82 struct timespec tv[2];
83
84 if (t) {
85 if (get_user(tv[0].tv_sec, &t->actime) ||
86 get_user(tv[1].tv_sec, &t->modtime))
87 return -EFAULT;
88 tv[0].tv_nsec = 0;
89 tv[1].tv_nsec = 0;
90 }
91 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92 }
93
94 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
95 {
96 struct timespec tv[2];
97
98 if (t) {
99 if (get_compat_timespec(&tv[0], &t[0]) ||
100 get_compat_timespec(&tv[1], &t[1]))
101 return -EFAULT;
102
103 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
104 return 0;
105 }
106 return do_utimes(dfd, filename, t ? tv : NULL, flags);
107 }
108
109 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
110 {
111 struct timespec tv[2];
112
113 if (t) {
114 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
115 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
116 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
117 get_user(tv[1].tv_nsec, &t[1].tv_usec))
118 return -EFAULT;
119 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
120 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
121 return -EINVAL;
122 tv[0].tv_nsec *= 1000;
123 tv[1].tv_nsec *= 1000;
124 }
125 return do_utimes(dfd, filename, t ? tv : NULL, 0);
126 }
127
128 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
129 {
130 return compat_sys_futimesat(AT_FDCWD, filename, t);
131 }
132
133 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
134 {
135 compat_ino_t ino = stat->ino;
136 typeof(ubuf->st_uid) uid = 0;
137 typeof(ubuf->st_gid) gid = 0;
138 int err;
139
140 SET_UID(uid, stat->uid);
141 SET_GID(gid, stat->gid);
142
143 if ((u64) stat->size > MAX_NON_LFS ||
144 !old_valid_dev(stat->dev) ||
145 !old_valid_dev(stat->rdev))
146 return -EOVERFLOW;
147 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
148 return -EOVERFLOW;
149
150 if (clear_user(ubuf, sizeof(*ubuf)))
151 return -EFAULT;
152
153 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
154 err |= __put_user(ino, &ubuf->st_ino);
155 err |= __put_user(stat->mode, &ubuf->st_mode);
156 err |= __put_user(stat->nlink, &ubuf->st_nlink);
157 err |= __put_user(uid, &ubuf->st_uid);
158 err |= __put_user(gid, &ubuf->st_gid);
159 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
160 err |= __put_user(stat->size, &ubuf->st_size);
161 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
162 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
163 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
164 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
165 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
166 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
167 err |= __put_user(stat->blksize, &ubuf->st_blksize);
168 err |= __put_user(stat->blocks, &ubuf->st_blocks);
169 return err;
170 }
171
172 asmlinkage long compat_sys_newstat(char __user * filename,
173 struct compat_stat __user *statbuf)
174 {
175 struct kstat stat;
176 int error;
177
178 error = vfs_stat(filename, &stat);
179 if (error)
180 return error;
181 return cp_compat_stat(&stat, statbuf);
182 }
183
184 asmlinkage long compat_sys_newlstat(char __user * filename,
185 struct compat_stat __user *statbuf)
186 {
187 struct kstat stat;
188 int error;
189
190 error = vfs_lstat(filename, &stat);
191 if (error)
192 return error;
193 return cp_compat_stat(&stat, statbuf);
194 }
195
196 #ifndef __ARCH_WANT_STAT64
197 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
198 struct compat_stat __user *statbuf, int flag)
199 {
200 struct kstat stat;
201 int error;
202
203 error = vfs_fstatat(dfd, filename, &stat, flag);
204 if (error)
205 return error;
206 return cp_compat_stat(&stat, statbuf);
207 }
208 #endif
209
210 asmlinkage long compat_sys_newfstat(unsigned int fd,
211 struct compat_stat __user * statbuf)
212 {
213 struct kstat stat;
214 int error = vfs_fstat(fd, &stat);
215
216 if (!error)
217 error = cp_compat_stat(&stat, statbuf);
218 return error;
219 }
220
221 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
222 {
223
224 if (sizeof ubuf->f_blocks == 4) {
225 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
226 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
227 return -EOVERFLOW;
228 /* f_files and f_ffree may be -1; it's okay
229 * to stuff that into 32 bits */
230 if (kbuf->f_files != 0xffffffffffffffffULL
231 && (kbuf->f_files & 0xffffffff00000000ULL))
232 return -EOVERFLOW;
233 if (kbuf->f_ffree != 0xffffffffffffffffULL
234 && (kbuf->f_ffree & 0xffffffff00000000ULL))
235 return -EOVERFLOW;
236 }
237 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
238 __put_user(kbuf->f_type, &ubuf->f_type) ||
239 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
240 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
241 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
242 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
243 __put_user(kbuf->f_files, &ubuf->f_files) ||
244 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
245 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
246 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
247 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
248 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
249 __put_user(0, &ubuf->f_spare[0]) ||
250 __put_user(0, &ubuf->f_spare[1]) ||
251 __put_user(0, &ubuf->f_spare[2]) ||
252 __put_user(0, &ubuf->f_spare[3]) ||
253 __put_user(0, &ubuf->f_spare[4]))
254 return -EFAULT;
255 return 0;
256 }
257
258 /*
259 * The following statfs calls are copies of code from fs/open.c and
260 * should be checked against those from time to time
261 */
262 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
263 {
264 struct path path;
265 int error;
266
267 error = user_path(pathname, &path);
268 if (!error) {
269 struct kstatfs tmp;
270 error = vfs_statfs(path.dentry, &tmp);
271 if (!error)
272 error = put_compat_statfs(buf, &tmp);
273 path_put(&path);
274 }
275 return error;
276 }
277
278 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
279 {
280 struct file * file;
281 struct kstatfs tmp;
282 int error;
283
284 error = -EBADF;
285 file = fget(fd);
286 if (!file)
287 goto out;
288 error = vfs_statfs(file->f_path.dentry, &tmp);
289 if (!error)
290 error = put_compat_statfs(buf, &tmp);
291 fput(file);
292 out:
293 return error;
294 }
295
296 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
297 {
298 if (sizeof ubuf->f_blocks == 4) {
299 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
300 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
301 return -EOVERFLOW;
302 /* f_files and f_ffree may be -1; it's okay
303 * to stuff that into 32 bits */
304 if (kbuf->f_files != 0xffffffffffffffffULL
305 && (kbuf->f_files & 0xffffffff00000000ULL))
306 return -EOVERFLOW;
307 if (kbuf->f_ffree != 0xffffffffffffffffULL
308 && (kbuf->f_ffree & 0xffffffff00000000ULL))
309 return -EOVERFLOW;
310 }
311 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
312 __put_user(kbuf->f_type, &ubuf->f_type) ||
313 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
314 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
315 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
316 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
317 __put_user(kbuf->f_files, &ubuf->f_files) ||
318 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
319 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
320 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
321 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
322 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
323 return -EFAULT;
324 return 0;
325 }
326
327 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
328 {
329 struct path path;
330 int error;
331
332 if (sz != sizeof(*buf))
333 return -EINVAL;
334
335 error = user_path(pathname, &path);
336 if (!error) {
337 struct kstatfs tmp;
338 error = vfs_statfs(path.dentry, &tmp);
339 if (!error)
340 error = put_compat_statfs64(buf, &tmp);
341 path_put(&path);
342 }
343 return error;
344 }
345
346 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
347 {
348 struct file * file;
349 struct kstatfs tmp;
350 int error;
351
352 if (sz != sizeof(*buf))
353 return -EINVAL;
354
355 error = -EBADF;
356 file = fget(fd);
357 if (!file)
358 goto out;
359 error = vfs_statfs(file->f_path.dentry, &tmp);
360 if (!error)
361 error = put_compat_statfs64(buf, &tmp);
362 fput(file);
363 out:
364 return error;
365 }
366
367 /*
368 * This is a copy of sys_ustat, just dealing with a structure layout.
369 * Given how simple this syscall is that apporach is more maintainable
370 * than the various conversion hacks.
371 */
372 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
373 {
374 struct super_block *sb;
375 struct compat_ustat tmp;
376 struct kstatfs sbuf;
377 int err;
378
379 sb = user_get_super(new_decode_dev(dev));
380 if (!sb)
381 return -EINVAL;
382 err = vfs_statfs(sb->s_root, &sbuf);
383 drop_super(sb);
384 if (err)
385 return err;
386
387 memset(&tmp, 0, sizeof(struct compat_ustat));
388 tmp.f_tfree = sbuf.f_bfree;
389 tmp.f_tinode = sbuf.f_ffree;
390 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
391 return -EFAULT;
392 return 0;
393 }
394
395 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
396 {
397 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
398 __get_user(kfl->l_type, &ufl->l_type) ||
399 __get_user(kfl->l_whence, &ufl->l_whence) ||
400 __get_user(kfl->l_start, &ufl->l_start) ||
401 __get_user(kfl->l_len, &ufl->l_len) ||
402 __get_user(kfl->l_pid, &ufl->l_pid))
403 return -EFAULT;
404 return 0;
405 }
406
407 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
408 {
409 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
410 __put_user(kfl->l_type, &ufl->l_type) ||
411 __put_user(kfl->l_whence, &ufl->l_whence) ||
412 __put_user(kfl->l_start, &ufl->l_start) ||
413 __put_user(kfl->l_len, &ufl->l_len) ||
414 __put_user(kfl->l_pid, &ufl->l_pid))
415 return -EFAULT;
416 return 0;
417 }
418
419 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
420 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
421 {
422 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
423 __get_user(kfl->l_type, &ufl->l_type) ||
424 __get_user(kfl->l_whence, &ufl->l_whence) ||
425 __get_user(kfl->l_start, &ufl->l_start) ||
426 __get_user(kfl->l_len, &ufl->l_len) ||
427 __get_user(kfl->l_pid, &ufl->l_pid))
428 return -EFAULT;
429 return 0;
430 }
431 #endif
432
433 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
434 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
435 {
436 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
437 __put_user(kfl->l_type, &ufl->l_type) ||
438 __put_user(kfl->l_whence, &ufl->l_whence) ||
439 __put_user(kfl->l_start, &ufl->l_start) ||
440 __put_user(kfl->l_len, &ufl->l_len) ||
441 __put_user(kfl->l_pid, &ufl->l_pid))
442 return -EFAULT;
443 return 0;
444 }
445 #endif
446
447 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
448 unsigned long arg)
449 {
450 mm_segment_t old_fs;
451 struct flock f;
452 long ret;
453
454 switch (cmd) {
455 case F_GETLK:
456 case F_SETLK:
457 case F_SETLKW:
458 ret = get_compat_flock(&f, compat_ptr(arg));
459 if (ret != 0)
460 break;
461 old_fs = get_fs();
462 set_fs(KERNEL_DS);
463 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
464 set_fs(old_fs);
465 if (cmd == F_GETLK && ret == 0) {
466 /* GETLK was successful and we need to return the data...
467 * but it needs to fit in the compat structure.
468 * l_start shouldn't be too big, unless the original
469 * start + end is greater than COMPAT_OFF_T_MAX, in which
470 * case the app was asking for trouble, so we return
471 * -EOVERFLOW in that case.
472 * l_len could be too big, in which case we just truncate it,
473 * and only allow the app to see that part of the conflicting
474 * lock that might make sense to it anyway
475 */
476
477 if (f.l_start > COMPAT_OFF_T_MAX)
478 ret = -EOVERFLOW;
479 if (f.l_len > COMPAT_OFF_T_MAX)
480 f.l_len = COMPAT_OFF_T_MAX;
481 if (ret == 0)
482 ret = put_compat_flock(&f, compat_ptr(arg));
483 }
484 break;
485
486 case F_GETLK64:
487 case F_SETLK64:
488 case F_SETLKW64:
489 ret = get_compat_flock64(&f, compat_ptr(arg));
490 if (ret != 0)
491 break;
492 old_fs = get_fs();
493 set_fs(KERNEL_DS);
494 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
495 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
496 (unsigned long)&f);
497 set_fs(old_fs);
498 if (cmd == F_GETLK64 && ret == 0) {
499 /* need to return lock information - see above for commentary */
500 if (f.l_start > COMPAT_LOFF_T_MAX)
501 ret = -EOVERFLOW;
502 if (f.l_len > COMPAT_LOFF_T_MAX)
503 f.l_len = COMPAT_LOFF_T_MAX;
504 if (ret == 0)
505 ret = put_compat_flock64(&f, compat_ptr(arg));
506 }
507 break;
508
509 default:
510 ret = sys_fcntl(fd, cmd, arg);
511 break;
512 }
513 return ret;
514 }
515
516 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
517 unsigned long arg)
518 {
519 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
520 return -EINVAL;
521 return compat_sys_fcntl64(fd, cmd, arg);
522 }
523
524 asmlinkage long
525 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
526 {
527 long ret;
528 aio_context_t ctx64;
529
530 mm_segment_t oldfs = get_fs();
531 if (unlikely(get_user(ctx64, ctx32p)))
532 return -EFAULT;
533
534 set_fs(KERNEL_DS);
535 /* The __user pointer cast is valid because of the set_fs() */
536 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
537 set_fs(oldfs);
538 /* truncating is ok because it's a user address */
539 if (!ret)
540 ret = put_user((u32) ctx64, ctx32p);
541 return ret;
542 }
543
544 asmlinkage long
545 compat_sys_io_getevents(aio_context_t ctx_id,
546 unsigned long min_nr,
547 unsigned long nr,
548 struct io_event __user *events,
549 struct compat_timespec __user *timeout)
550 {
551 long ret;
552 struct timespec t;
553 struct timespec __user *ut = NULL;
554
555 ret = -EFAULT;
556 if (unlikely(!access_ok(VERIFY_WRITE, events,
557 nr * sizeof(struct io_event))))
558 goto out;
559 if (timeout) {
560 if (get_compat_timespec(&t, timeout))
561 goto out;
562
563 ut = compat_alloc_user_space(sizeof(*ut));
564 if (copy_to_user(ut, &t, sizeof(t)) )
565 goto out;
566 }
567 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
568 out:
569 return ret;
570 }
571
572 static inline long
573 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
574 {
575 compat_uptr_t uptr;
576 int i;
577
578 for (i = 0; i < nr; ++i) {
579 if (get_user(uptr, ptr32 + i))
580 return -EFAULT;
581 if (put_user(compat_ptr(uptr), ptr64 + i))
582 return -EFAULT;
583 }
584 return 0;
585 }
586
587 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
588
589 asmlinkage long
590 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
591 {
592 struct iocb __user * __user *iocb64;
593 long ret;
594
595 if (unlikely(nr < 0))
596 return -EINVAL;
597
598 if (nr > MAX_AIO_SUBMITS)
599 nr = MAX_AIO_SUBMITS;
600
601 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
602 ret = copy_iocb(nr, iocb, iocb64);
603 if (!ret)
604 ret = sys_io_submit(ctx_id, nr, iocb64);
605 return ret;
606 }
607
608 struct compat_ncp_mount_data {
609 compat_int_t version;
610 compat_uint_t ncp_fd;
611 __compat_uid_t mounted_uid;
612 compat_pid_t wdog_pid;
613 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
614 compat_uint_t time_out;
615 compat_uint_t retry_count;
616 compat_uint_t flags;
617 __compat_uid_t uid;
618 __compat_gid_t gid;
619 compat_mode_t file_mode;
620 compat_mode_t dir_mode;
621 };
622
623 struct compat_ncp_mount_data_v4 {
624 compat_int_t version;
625 compat_ulong_t flags;
626 compat_ulong_t mounted_uid;
627 compat_long_t wdog_pid;
628 compat_uint_t ncp_fd;
629 compat_uint_t time_out;
630 compat_uint_t retry_count;
631 compat_ulong_t uid;
632 compat_ulong_t gid;
633 compat_ulong_t file_mode;
634 compat_ulong_t dir_mode;
635 };
636
637 static void *do_ncp_super_data_conv(void *raw_data)
638 {
639 int version = *(unsigned int *)raw_data;
640
641 if (version == 3) {
642 struct compat_ncp_mount_data *c_n = raw_data;
643 struct ncp_mount_data *n = raw_data;
644
645 n->dir_mode = c_n->dir_mode;
646 n->file_mode = c_n->file_mode;
647 n->gid = c_n->gid;
648 n->uid = c_n->uid;
649 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
650 n->wdog_pid = c_n->wdog_pid;
651 n->mounted_uid = c_n->mounted_uid;
652 } else if (version == 4) {
653 struct compat_ncp_mount_data_v4 *c_n = raw_data;
654 struct ncp_mount_data_v4 *n = raw_data;
655
656 n->dir_mode = c_n->dir_mode;
657 n->file_mode = c_n->file_mode;
658 n->gid = c_n->gid;
659 n->uid = c_n->uid;
660 n->retry_count = c_n->retry_count;
661 n->time_out = c_n->time_out;
662 n->ncp_fd = c_n->ncp_fd;
663 n->wdog_pid = c_n->wdog_pid;
664 n->mounted_uid = c_n->mounted_uid;
665 n->flags = c_n->flags;
666 } else if (version != 5) {
667 return NULL;
668 }
669
670 return raw_data;
671 }
672
673 struct compat_smb_mount_data {
674 compat_int_t version;
675 __compat_uid_t mounted_uid;
676 __compat_uid_t uid;
677 __compat_gid_t gid;
678 compat_mode_t file_mode;
679 compat_mode_t dir_mode;
680 };
681
682 static void *do_smb_super_data_conv(void *raw_data)
683 {
684 struct smb_mount_data *s = raw_data;
685 struct compat_smb_mount_data *c_s = raw_data;
686
687 if (c_s->version != SMB_MOUNT_OLDVERSION)
688 goto out;
689 s->dir_mode = c_s->dir_mode;
690 s->file_mode = c_s->file_mode;
691 s->gid = c_s->gid;
692 s->uid = c_s->uid;
693 s->mounted_uid = c_s->mounted_uid;
694 out:
695 return raw_data;
696 }
697
698 struct compat_nfs_string {
699 compat_uint_t len;
700 compat_uptr_t data;
701 };
702
703 static inline void compat_nfs_string(struct nfs_string *dst,
704 struct compat_nfs_string *src)
705 {
706 dst->data = compat_ptr(src->data);
707 dst->len = src->len;
708 }
709
710 struct compat_nfs4_mount_data_v1 {
711 compat_int_t version;
712 compat_int_t flags;
713 compat_int_t rsize;
714 compat_int_t wsize;
715 compat_int_t timeo;
716 compat_int_t retrans;
717 compat_int_t acregmin;
718 compat_int_t acregmax;
719 compat_int_t acdirmin;
720 compat_int_t acdirmax;
721 struct compat_nfs_string client_addr;
722 struct compat_nfs_string mnt_path;
723 struct compat_nfs_string hostname;
724 compat_uint_t host_addrlen;
725 compat_uptr_t host_addr;
726 compat_int_t proto;
727 compat_int_t auth_flavourlen;
728 compat_uptr_t auth_flavours;
729 };
730
731 static int do_nfs4_super_data_conv(void *raw_data)
732 {
733 int version = *(compat_uint_t *) raw_data;
734
735 if (version == 1) {
736 struct compat_nfs4_mount_data_v1 *raw = raw_data;
737 struct nfs4_mount_data *real = raw_data;
738
739 /* copy the fields backwards */
740 real->auth_flavours = compat_ptr(raw->auth_flavours);
741 real->auth_flavourlen = raw->auth_flavourlen;
742 real->proto = raw->proto;
743 real->host_addr = compat_ptr(raw->host_addr);
744 real->host_addrlen = raw->host_addrlen;
745 compat_nfs_string(&real->hostname, &raw->hostname);
746 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
747 compat_nfs_string(&real->client_addr, &raw->client_addr);
748 real->acdirmax = raw->acdirmax;
749 real->acdirmin = raw->acdirmin;
750 real->acregmax = raw->acregmax;
751 real->acregmin = raw->acregmin;
752 real->retrans = raw->retrans;
753 real->timeo = raw->timeo;
754 real->wsize = raw->wsize;
755 real->rsize = raw->rsize;
756 real->flags = raw->flags;
757 real->version = raw->version;
758 }
759
760 return 0;
761 }
762
763 #define SMBFS_NAME "smbfs"
764 #define NCPFS_NAME "ncpfs"
765 #define NFS4_NAME "nfs4"
766
767 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
768 char __user * type, unsigned long flags,
769 void __user * data)
770 {
771 char *kernel_type;
772 unsigned long data_page;
773 char *kernel_dev;
774 char *dir_page;
775 int retval;
776
777 retval = copy_mount_string(type, &kernel_type);
778 if (retval < 0)
779 goto out;
780
781 dir_page = getname(dir_name);
782 retval = PTR_ERR(dir_page);
783 if (IS_ERR(dir_page))
784 goto out1;
785
786 retval = copy_mount_string(dev_name, &kernel_dev);
787 if (retval < 0)
788 goto out2;
789
790 retval = copy_mount_options(data, &data_page);
791 if (retval < 0)
792 goto out3;
793
794 retval = -EINVAL;
795
796 if (kernel_type && data_page) {
797 if (!strcmp(kernel_type, SMBFS_NAME)) {
798 do_smb_super_data_conv((void *)data_page);
799 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
800 do_ncp_super_data_conv((void *)data_page);
801 } else if (!strcmp(kernel_type, NFS4_NAME)) {
802 if (do_nfs4_super_data_conv((void *) data_page))
803 goto out4;
804 }
805 }
806
807 retval = do_mount(kernel_dev, dir_page, kernel_type,
808 flags, (void*)data_page);
809
810 out4:
811 free_page(data_page);
812 out3:
813 kfree(kernel_dev);
814 out2:
815 putname(dir_page);
816 out1:
817 kfree(kernel_type);
818 out:
819 return retval;
820 }
821
822 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
823
824 struct compat_old_linux_dirent {
825 compat_ulong_t d_ino;
826 compat_ulong_t d_offset;
827 unsigned short d_namlen;
828 char d_name[1];
829 };
830
831 struct compat_readdir_callback {
832 struct compat_old_linux_dirent __user *dirent;
833 int result;
834 };
835
836 static int compat_fillonedir(void *__buf, const char *name, int namlen,
837 loff_t offset, u64 ino, unsigned int d_type)
838 {
839 struct compat_readdir_callback *buf = __buf;
840 struct compat_old_linux_dirent __user *dirent;
841 compat_ulong_t d_ino;
842
843 if (buf->result)
844 return -EINVAL;
845 d_ino = ino;
846 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
847 buf->result = -EOVERFLOW;
848 return -EOVERFLOW;
849 }
850 buf->result++;
851 dirent = buf->dirent;
852 if (!access_ok(VERIFY_WRITE, dirent,
853 (unsigned long)(dirent->d_name + namlen + 1) -
854 (unsigned long)dirent))
855 goto efault;
856 if ( __put_user(d_ino, &dirent->d_ino) ||
857 __put_user(offset, &dirent->d_offset) ||
858 __put_user(namlen, &dirent->d_namlen) ||
859 __copy_to_user(dirent->d_name, name, namlen) ||
860 __put_user(0, dirent->d_name + namlen))
861 goto efault;
862 return 0;
863 efault:
864 buf->result = -EFAULT;
865 return -EFAULT;
866 }
867
868 asmlinkage long compat_sys_old_readdir(unsigned int fd,
869 struct compat_old_linux_dirent __user *dirent, unsigned int count)
870 {
871 int error;
872 struct file *file;
873 struct compat_readdir_callback buf;
874
875 error = -EBADF;
876 file = fget(fd);
877 if (!file)
878 goto out;
879
880 buf.result = 0;
881 buf.dirent = dirent;
882
883 error = vfs_readdir(file, compat_fillonedir, &buf);
884 if (buf.result)
885 error = buf.result;
886
887 fput(file);
888 out:
889 return error;
890 }
891
892 struct compat_linux_dirent {
893 compat_ulong_t d_ino;
894 compat_ulong_t d_off;
895 unsigned short d_reclen;
896 char d_name[1];
897 };
898
899 struct compat_getdents_callback {
900 struct compat_linux_dirent __user *current_dir;
901 struct compat_linux_dirent __user *previous;
902 int count;
903 int error;
904 };
905
906 static int compat_filldir(void *__buf, const char *name, int namlen,
907 loff_t offset, u64 ino, unsigned int d_type)
908 {
909 struct compat_linux_dirent __user * dirent;
910 struct compat_getdents_callback *buf = __buf;
911 compat_ulong_t d_ino;
912 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
913
914 buf->error = -EINVAL; /* only used if we fail.. */
915 if (reclen > buf->count)
916 return -EINVAL;
917 d_ino = ino;
918 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
919 buf->error = -EOVERFLOW;
920 return -EOVERFLOW;
921 }
922 dirent = buf->previous;
923 if (dirent) {
924 if (__put_user(offset, &dirent->d_off))
925 goto efault;
926 }
927 dirent = buf->current_dir;
928 if (__put_user(d_ino, &dirent->d_ino))
929 goto efault;
930 if (__put_user(reclen, &dirent->d_reclen))
931 goto efault;
932 if (copy_to_user(dirent->d_name, name, namlen))
933 goto efault;
934 if (__put_user(0, dirent->d_name + namlen))
935 goto efault;
936 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
937 goto efault;
938 buf->previous = dirent;
939 dirent = (void __user *)dirent + reclen;
940 buf->current_dir = dirent;
941 buf->count -= reclen;
942 return 0;
943 efault:
944 buf->error = -EFAULT;
945 return -EFAULT;
946 }
947
948 asmlinkage long compat_sys_getdents(unsigned int fd,
949 struct compat_linux_dirent __user *dirent, unsigned int count)
950 {
951 struct file * file;
952 struct compat_linux_dirent __user * lastdirent;
953 struct compat_getdents_callback buf;
954 int error;
955
956 error = -EFAULT;
957 if (!access_ok(VERIFY_WRITE, dirent, count))
958 goto out;
959
960 error = -EBADF;
961 file = fget(fd);
962 if (!file)
963 goto out;
964
965 buf.current_dir = dirent;
966 buf.previous = NULL;
967 buf.count = count;
968 buf.error = 0;
969
970 error = vfs_readdir(file, compat_filldir, &buf);
971 if (error >= 0)
972 error = buf.error;
973 lastdirent = buf.previous;
974 if (lastdirent) {
975 if (put_user(file->f_pos, &lastdirent->d_off))
976 error = -EFAULT;
977 else
978 error = count - buf.count;
979 }
980 fput(file);
981 out:
982 return error;
983 }
984
985 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
986
987 struct compat_getdents_callback64 {
988 struct linux_dirent64 __user *current_dir;
989 struct linux_dirent64 __user *previous;
990 int count;
991 int error;
992 };
993
994 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
995 u64 ino, unsigned int d_type)
996 {
997 struct linux_dirent64 __user *dirent;
998 struct compat_getdents_callback64 *buf = __buf;
999 int jj = NAME_OFFSET(dirent);
1000 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1001 u64 off;
1002
1003 buf->error = -EINVAL; /* only used if we fail.. */
1004 if (reclen > buf->count)
1005 return -EINVAL;
1006 dirent = buf->previous;
1007
1008 if (dirent) {
1009 if (__put_user_unaligned(offset, &dirent->d_off))
1010 goto efault;
1011 }
1012 dirent = buf->current_dir;
1013 if (__put_user_unaligned(ino, &dirent->d_ino))
1014 goto efault;
1015 off = 0;
1016 if (__put_user_unaligned(off, &dirent->d_off))
1017 goto efault;
1018 if (__put_user(reclen, &dirent->d_reclen))
1019 goto efault;
1020 if (__put_user(d_type, &dirent->d_type))
1021 goto efault;
1022 if (copy_to_user(dirent->d_name, name, namlen))
1023 goto efault;
1024 if (__put_user(0, dirent->d_name + namlen))
1025 goto efault;
1026 buf->previous = dirent;
1027 dirent = (void __user *)dirent + reclen;
1028 buf->current_dir = dirent;
1029 buf->count -= reclen;
1030 return 0;
1031 efault:
1032 buf->error = -EFAULT;
1033 return -EFAULT;
1034 }
1035
1036 asmlinkage long compat_sys_getdents64(unsigned int fd,
1037 struct linux_dirent64 __user * dirent, unsigned int count)
1038 {
1039 struct file * file;
1040 struct linux_dirent64 __user * lastdirent;
1041 struct compat_getdents_callback64 buf;
1042 int error;
1043
1044 error = -EFAULT;
1045 if (!access_ok(VERIFY_WRITE, dirent, count))
1046 goto out;
1047
1048 error = -EBADF;
1049 file = fget(fd);
1050 if (!file)
1051 goto out;
1052
1053 buf.current_dir = dirent;
1054 buf.previous = NULL;
1055 buf.count = count;
1056 buf.error = 0;
1057
1058 error = vfs_readdir(file, compat_filldir64, &buf);
1059 if (error >= 0)
1060 error = buf.error;
1061 lastdirent = buf.previous;
1062 if (lastdirent) {
1063 typeof(lastdirent->d_off) d_off = file->f_pos;
1064 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1065 error = -EFAULT;
1066 else
1067 error = count - buf.count;
1068 }
1069 fput(file);
1070 out:
1071 return error;
1072 }
1073 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1074
1075 static ssize_t compat_do_readv_writev(int type, struct file *file,
1076 const struct compat_iovec __user *uvector,
1077 unsigned long nr_segs, loff_t *pos)
1078 {
1079 compat_ssize_t tot_len;
1080 struct iovec iovstack[UIO_FASTIOV];
1081 struct iovec *iov=iovstack, *vector;
1082 ssize_t ret;
1083 int seg;
1084 io_fn_t fn;
1085 iov_fn_t fnv;
1086
1087 /*
1088 * SuS says "The readv() function *may* fail if the iovcnt argument
1089 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1090 * traditionally returned zero for zero segments, so...
1091 */
1092 ret = 0;
1093 if (nr_segs == 0)
1094 goto out;
1095
1096 /*
1097 * First get the "struct iovec" from user memory and
1098 * verify all the pointers
1099 */
1100 ret = -EINVAL;
1101 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1102 goto out;
1103 if (!file->f_op)
1104 goto out;
1105 if (nr_segs > UIO_FASTIOV) {
1106 ret = -ENOMEM;
1107 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1108 if (!iov)
1109 goto out;
1110 }
1111 ret = -EFAULT;
1112 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1113 goto out;
1114
1115 /*
1116 * Single unix specification:
1117 * We should -EINVAL if an element length is not >= 0 and fitting an
1118 * ssize_t. The total length is fitting an ssize_t
1119 *
1120 * Be careful here because iov_len is a size_t not an ssize_t
1121 */
1122 tot_len = 0;
1123 vector = iov;
1124 ret = -EINVAL;
1125 for (seg = 0 ; seg < nr_segs; seg++) {
1126 compat_ssize_t tmp = tot_len;
1127 compat_ssize_t len;
1128 compat_uptr_t buf;
1129
1130 if (__get_user(len, &uvector->iov_len) ||
1131 __get_user(buf, &uvector->iov_base)) {
1132 ret = -EFAULT;
1133 goto out;
1134 }
1135 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1136 goto out;
1137 tot_len += len;
1138 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1139 goto out;
1140 vector->iov_base = compat_ptr(buf);
1141 vector->iov_len = (compat_size_t) len;
1142 uvector++;
1143 vector++;
1144 }
1145 if (tot_len == 0) {
1146 ret = 0;
1147 goto out;
1148 }
1149
1150 ret = rw_verify_area(type, file, pos, tot_len);
1151 if (ret < 0)
1152 goto out;
1153
1154 fnv = NULL;
1155 if (type == READ) {
1156 fn = file->f_op->read;
1157 fnv = file->f_op->aio_read;
1158 } else {
1159 fn = (io_fn_t)file->f_op->write;
1160 fnv = file->f_op->aio_write;
1161 }
1162
1163 if (fnv)
1164 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1165 pos, fnv);
1166 else
1167 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1168
1169 out:
1170 if (iov != iovstack)
1171 kfree(iov);
1172 if ((ret + (type == READ)) > 0) {
1173 struct dentry *dentry = file->f_path.dentry;
1174 if (type == READ)
1175 fsnotify_access(dentry);
1176 else
1177 fsnotify_modify(dentry);
1178 }
1179 return ret;
1180 }
1181
1182 static size_t compat_readv(struct file *file,
1183 const struct compat_iovec __user *vec,
1184 unsigned long vlen, loff_t *pos)
1185 {
1186 ssize_t ret = -EBADF;
1187
1188 if (!(file->f_mode & FMODE_READ))
1189 goto out;
1190
1191 ret = -EINVAL;
1192 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1193 goto out;
1194
1195 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1196
1197 out:
1198 if (ret > 0)
1199 add_rchar(current, ret);
1200 inc_syscr(current);
1201 return ret;
1202 }
1203
1204 asmlinkage ssize_t
1205 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1206 unsigned long vlen)
1207 {
1208 struct file *file;
1209 int fput_needed;
1210 ssize_t ret;
1211
1212 file = fget_light(fd, &fput_needed);
1213 if (!file)
1214 return -EBADF;
1215 ret = compat_readv(file, vec, vlen, &file->f_pos);
1216 fput_light(file, fput_needed);
1217 return ret;
1218 }
1219
1220 asmlinkage ssize_t
1221 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1222 unsigned long vlen, u32 pos_low, u32 pos_high)
1223 {
1224 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1225 struct file *file;
1226 int fput_needed;
1227 ssize_t ret;
1228
1229 if (pos < 0)
1230 return -EINVAL;
1231 file = fget_light(fd, &fput_needed);
1232 if (!file)
1233 return -EBADF;
1234 ret = compat_readv(file, vec, vlen, &pos);
1235 fput_light(file, fput_needed);
1236 return ret;
1237 }
1238
1239 static size_t compat_writev(struct file *file,
1240 const struct compat_iovec __user *vec,
1241 unsigned long vlen, loff_t *pos)
1242 {
1243 ssize_t ret = -EBADF;
1244
1245 if (!(file->f_mode & FMODE_WRITE))
1246 goto out;
1247
1248 ret = -EINVAL;
1249 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1250 goto out;
1251
1252 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1253
1254 out:
1255 if (ret > 0)
1256 add_wchar(current, ret);
1257 inc_syscw(current);
1258 return ret;
1259 }
1260
1261 asmlinkage ssize_t
1262 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1263 unsigned long vlen)
1264 {
1265 struct file *file;
1266 int fput_needed;
1267 ssize_t ret;
1268
1269 file = fget_light(fd, &fput_needed);
1270 if (!file)
1271 return -EBADF;
1272 ret = compat_writev(file, vec, vlen, &file->f_pos);
1273 fput_light(file, fput_needed);
1274 return ret;
1275 }
1276
1277 asmlinkage ssize_t
1278 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1279 unsigned long vlen, u32 pos_low, u32 pos_high)
1280 {
1281 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1282 struct file *file;
1283 int fput_needed;
1284 ssize_t ret;
1285
1286 if (pos < 0)
1287 return -EINVAL;
1288 file = fget_light(fd, &fput_needed);
1289 if (!file)
1290 return -EBADF;
1291 ret = compat_writev(file, vec, vlen, &pos);
1292 fput_light(file, fput_needed);
1293 return ret;
1294 }
1295
1296 asmlinkage long
1297 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1298 unsigned int nr_segs, unsigned int flags)
1299 {
1300 unsigned i;
1301 struct iovec __user *iov;
1302 if (nr_segs > UIO_MAXIOV)
1303 return -EINVAL;
1304 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1305 for (i = 0; i < nr_segs; i++) {
1306 struct compat_iovec v;
1307 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1308 get_user(v.iov_len, &iov32[i].iov_len) ||
1309 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1310 put_user(v.iov_len, &iov[i].iov_len))
1311 return -EFAULT;
1312 }
1313 return sys_vmsplice(fd, iov, nr_segs, flags);
1314 }
1315
1316 /*
1317 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1318 * O_LARGEFILE flag.
1319 */
1320 asmlinkage long
1321 compat_sys_open(const char __user *filename, int flags, int mode)
1322 {
1323 return do_sys_open(AT_FDCWD, filename, flags, mode);
1324 }
1325
1326 /*
1327 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1328 * O_LARGEFILE flag.
1329 */
1330 asmlinkage long
1331 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1332 {
1333 return do_sys_open(dfd, filename, flags, mode);
1334 }
1335
1336 /*
1337 * compat_count() counts the number of arguments/envelopes. It is basically
1338 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1339 * and envp pointers.
1340 */
1341 static int compat_count(compat_uptr_t __user *argv, int max)
1342 {
1343 int i = 0;
1344
1345 if (argv != NULL) {
1346 for (;;) {
1347 compat_uptr_t p;
1348
1349 if (get_user(p, argv))
1350 return -EFAULT;
1351 if (!p)
1352 break;
1353 argv++;
1354 if (i++ >= max)
1355 return -E2BIG;
1356 }
1357 }
1358 return i;
1359 }
1360
1361 /*
1362 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1363 * except that it works with 32 bit argv and envp pointers.
1364 */
1365 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1366 struct linux_binprm *bprm)
1367 {
1368 struct page *kmapped_page = NULL;
1369 char *kaddr = NULL;
1370 unsigned long kpos = 0;
1371 int ret;
1372
1373 while (argc-- > 0) {
1374 compat_uptr_t str;
1375 int len;
1376 unsigned long pos;
1377
1378 if (get_user(str, argv+argc) ||
1379 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1380 ret = -EFAULT;
1381 goto out;
1382 }
1383
1384 if (len > MAX_ARG_STRLEN) {
1385 ret = -E2BIG;
1386 goto out;
1387 }
1388
1389 /* We're going to work our way backwords. */
1390 pos = bprm->p;
1391 str += len;
1392 bprm->p -= len;
1393
1394 while (len > 0) {
1395 int offset, bytes_to_copy;
1396
1397 offset = pos % PAGE_SIZE;
1398 if (offset == 0)
1399 offset = PAGE_SIZE;
1400
1401 bytes_to_copy = offset;
1402 if (bytes_to_copy > len)
1403 bytes_to_copy = len;
1404
1405 offset -= bytes_to_copy;
1406 pos -= bytes_to_copy;
1407 str -= bytes_to_copy;
1408 len -= bytes_to_copy;
1409
1410 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1411 struct page *page;
1412
1413 #ifdef CONFIG_STACK_GROWSUP
1414 ret = expand_stack_downwards(bprm->vma, pos);
1415 if (ret < 0) {
1416 /* We've exceed the stack rlimit. */
1417 ret = -E2BIG;
1418 goto out;
1419 }
1420 #endif
1421 ret = get_user_pages(current, bprm->mm, pos,
1422 1, 1, 1, &page, NULL);
1423 if (ret <= 0) {
1424 /* We've exceed the stack rlimit. */
1425 ret = -E2BIG;
1426 goto out;
1427 }
1428
1429 if (kmapped_page) {
1430 flush_kernel_dcache_page(kmapped_page);
1431 kunmap(kmapped_page);
1432 put_page(kmapped_page);
1433 }
1434 kmapped_page = page;
1435 kaddr = kmap(kmapped_page);
1436 kpos = pos & PAGE_MASK;
1437 flush_cache_page(bprm->vma, kpos,
1438 page_to_pfn(kmapped_page));
1439 }
1440 if (copy_from_user(kaddr+offset, compat_ptr(str),
1441 bytes_to_copy)) {
1442 ret = -EFAULT;
1443 goto out;
1444 }
1445 }
1446 }
1447 ret = 0;
1448 out:
1449 if (kmapped_page) {
1450 flush_kernel_dcache_page(kmapped_page);
1451 kunmap(kmapped_page);
1452 put_page(kmapped_page);
1453 }
1454 return ret;
1455 }
1456
1457 /*
1458 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1459 * that it processes 32 bit argv and envp pointers.
1460 */
1461 int compat_do_execve(char * filename,
1462 compat_uptr_t __user *argv,
1463 compat_uptr_t __user *envp,
1464 struct pt_regs * regs)
1465 {
1466 struct linux_binprm *bprm;
1467 struct file *file;
1468 struct files_struct *displaced;
1469 bool clear_in_exec;
1470 int retval;
1471
1472 retval = unshare_files(&displaced);
1473 if (retval)
1474 goto out_ret;
1475
1476 retval = -ENOMEM;
1477 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1478 if (!bprm)
1479 goto out_files;
1480
1481 retval = prepare_bprm_creds(bprm);
1482 if (retval)
1483 goto out_free;
1484
1485 retval = check_unsafe_exec(bprm);
1486 if (retval < 0)
1487 goto out_free;
1488 clear_in_exec = retval;
1489 current->in_execve = 1;
1490
1491 file = open_exec(filename);
1492 retval = PTR_ERR(file);
1493 if (IS_ERR(file))
1494 goto out_unmark;
1495
1496 sched_exec();
1497
1498 bprm->file = file;
1499 bprm->filename = filename;
1500 bprm->interp = filename;
1501
1502 retval = bprm_mm_init(bprm);
1503 if (retval)
1504 goto out_file;
1505
1506 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1507 if ((retval = bprm->argc) < 0)
1508 goto out;
1509
1510 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1511 if ((retval = bprm->envc) < 0)
1512 goto out;
1513
1514 retval = prepare_binprm(bprm);
1515 if (retval < 0)
1516 goto out;
1517
1518 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1519 if (retval < 0)
1520 goto out;
1521
1522 bprm->exec = bprm->p;
1523 retval = compat_copy_strings(bprm->envc, envp, bprm);
1524 if (retval < 0)
1525 goto out;
1526
1527 retval = compat_copy_strings(bprm->argc, argv, bprm);
1528 if (retval < 0)
1529 goto out;
1530
1531 retval = search_binary_handler(bprm, regs);
1532 if (retval < 0)
1533 goto out;
1534
1535 current->stack_start = current->mm->start_stack;
1536
1537 /* execve succeeded */
1538 current->fs->in_exec = 0;
1539 current->in_execve = 0;
1540 acct_update_integrals(current);
1541 free_bprm(bprm);
1542 if (displaced)
1543 put_files_struct(displaced);
1544 return retval;
1545
1546 out:
1547 if (bprm->mm)
1548 mmput(bprm->mm);
1549
1550 out_file:
1551 if (bprm->file) {
1552 allow_write_access(bprm->file);
1553 fput(bprm->file);
1554 }
1555
1556 out_unmark:
1557 if (clear_in_exec)
1558 current->fs->in_exec = 0;
1559 current->in_execve = 0;
1560
1561 out_free:
1562 free_bprm(bprm);
1563
1564 out_files:
1565 if (displaced)
1566 reset_files_struct(displaced);
1567 out_ret:
1568 return retval;
1569 }
1570
1571 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1572
1573 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1574 int timeval, int ret)
1575 {
1576 struct timespec ts;
1577
1578 if (!p)
1579 return ret;
1580
1581 if (current->personality & STICKY_TIMEOUTS)
1582 goto sticky;
1583
1584 /* No update for zero timeout */
1585 if (!end_time->tv_sec && !end_time->tv_nsec)
1586 return ret;
1587
1588 ktime_get_ts(&ts);
1589 ts = timespec_sub(*end_time, ts);
1590 if (ts.tv_sec < 0)
1591 ts.tv_sec = ts.tv_nsec = 0;
1592
1593 if (timeval) {
1594 struct compat_timeval rtv;
1595
1596 rtv.tv_sec = ts.tv_sec;
1597 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1598
1599 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1600 return ret;
1601 } else {
1602 struct compat_timespec rts;
1603
1604 rts.tv_sec = ts.tv_sec;
1605 rts.tv_nsec = ts.tv_nsec;
1606
1607 if (!copy_to_user(p, &rts, sizeof(rts)))
1608 return ret;
1609 }
1610 /*
1611 * If an application puts its timeval in read-only memory, we
1612 * don't want the Linux-specific update to the timeval to
1613 * cause a fault after the select has completed
1614 * successfully. However, because we're not updating the
1615 * timeval, we can't restart the system call.
1616 */
1617
1618 sticky:
1619 if (ret == -ERESTARTNOHAND)
1620 ret = -EINTR;
1621 return ret;
1622 }
1623
1624 /*
1625 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1626 * 64-bit unsigned longs.
1627 */
1628 static
1629 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1630 unsigned long *fdset)
1631 {
1632 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1633 if (ufdset) {
1634 unsigned long odd;
1635
1636 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1637 return -EFAULT;
1638
1639 odd = nr & 1UL;
1640 nr &= ~1UL;
1641 while (nr) {
1642 unsigned long h, l;
1643 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1644 return -EFAULT;
1645 ufdset += 2;
1646 *fdset++ = h << 32 | l;
1647 nr -= 2;
1648 }
1649 if (odd && __get_user(*fdset, ufdset))
1650 return -EFAULT;
1651 } else {
1652 /* Tricky, must clear full unsigned long in the
1653 * kernel fdset at the end, this makes sure that
1654 * actually happens.
1655 */
1656 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1657 }
1658 return 0;
1659 }
1660
1661 static
1662 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1663 unsigned long *fdset)
1664 {
1665 unsigned long odd;
1666 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1667
1668 if (!ufdset)
1669 return 0;
1670
1671 odd = nr & 1UL;
1672 nr &= ~1UL;
1673 while (nr) {
1674 unsigned long h, l;
1675 l = *fdset++;
1676 h = l >> 32;
1677 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1678 return -EFAULT;
1679 ufdset += 2;
1680 nr -= 2;
1681 }
1682 if (odd && __put_user(*fdset, ufdset))
1683 return -EFAULT;
1684 return 0;
1685 }
1686
1687
1688 /*
1689 * This is a virtual copy of sys_select from fs/select.c and probably
1690 * should be compared to it from time to time
1691 */
1692
1693 /*
1694 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1695 * like to be certain this leads to no problems. So I return
1696 * EINTR just for safety.
1697 *
1698 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1699 * I'm trying ERESTARTNOHAND which restart only when you want to.
1700 */
1701 #define MAX_SELECT_SECONDS \
1702 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1703
1704 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1705 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1706 struct timespec *end_time)
1707 {
1708 fd_set_bits fds;
1709 void *bits;
1710 int size, max_fds, ret = -EINVAL;
1711 struct fdtable *fdt;
1712 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1713
1714 if (n < 0)
1715 goto out_nofds;
1716
1717 /* max_fds can increase, so grab it once to avoid race */
1718 rcu_read_lock();
1719 fdt = files_fdtable(current->files);
1720 max_fds = fdt->max_fds;
1721 rcu_read_unlock();
1722 if (n > max_fds)
1723 n = max_fds;
1724
1725 /*
1726 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1727 * since we used fdset we need to allocate memory in units of
1728 * long-words.
1729 */
1730 size = FDS_BYTES(n);
1731 bits = stack_fds;
1732 if (size > sizeof(stack_fds) / 6) {
1733 bits = kmalloc(6 * size, GFP_KERNEL);
1734 ret = -ENOMEM;
1735 if (!bits)
1736 goto out_nofds;
1737 }
1738 fds.in = (unsigned long *) bits;
1739 fds.out = (unsigned long *) (bits + size);
1740 fds.ex = (unsigned long *) (bits + 2*size);
1741 fds.res_in = (unsigned long *) (bits + 3*size);
1742 fds.res_out = (unsigned long *) (bits + 4*size);
1743 fds.res_ex = (unsigned long *) (bits + 5*size);
1744
1745 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1746 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1747 (ret = compat_get_fd_set(n, exp, fds.ex)))
1748 goto out;
1749 zero_fd_set(n, fds.res_in);
1750 zero_fd_set(n, fds.res_out);
1751 zero_fd_set(n, fds.res_ex);
1752
1753 ret = do_select(n, &fds, end_time);
1754
1755 if (ret < 0)
1756 goto out;
1757 if (!ret) {
1758 ret = -ERESTARTNOHAND;
1759 if (signal_pending(current))
1760 goto out;
1761 ret = 0;
1762 }
1763
1764 if (compat_set_fd_set(n, inp, fds.res_in) ||
1765 compat_set_fd_set(n, outp, fds.res_out) ||
1766 compat_set_fd_set(n, exp, fds.res_ex))
1767 ret = -EFAULT;
1768 out:
1769 if (bits != stack_fds)
1770 kfree(bits);
1771 out_nofds:
1772 return ret;
1773 }
1774
1775 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1776 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1777 struct compat_timeval __user *tvp)
1778 {
1779 struct timespec end_time, *to = NULL;
1780 struct compat_timeval tv;
1781 int ret;
1782
1783 if (tvp) {
1784 if (copy_from_user(&tv, tvp, sizeof(tv)))
1785 return -EFAULT;
1786
1787 to = &end_time;
1788 if (poll_select_set_timeout(to,
1789 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1790 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1791 return -EINVAL;
1792 }
1793
1794 ret = compat_core_sys_select(n, inp, outp, exp, to);
1795 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1796
1797 return ret;
1798 }
1799
1800 #ifdef HAVE_SET_RESTORE_SIGMASK
1801 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1802 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1803 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1804 compat_size_t sigsetsize)
1805 {
1806 compat_sigset_t ss32;
1807 sigset_t ksigmask, sigsaved;
1808 struct compat_timespec ts;
1809 struct timespec end_time, *to = NULL;
1810 int ret;
1811
1812 if (tsp) {
1813 if (copy_from_user(&ts, tsp, sizeof(ts)))
1814 return -EFAULT;
1815
1816 to = &end_time;
1817 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1818 return -EINVAL;
1819 }
1820
1821 if (sigmask) {
1822 if (sigsetsize != sizeof(compat_sigset_t))
1823 return -EINVAL;
1824 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1825 return -EFAULT;
1826 sigset_from_compat(&ksigmask, &ss32);
1827
1828 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1829 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1830 }
1831
1832 ret = compat_core_sys_select(n, inp, outp, exp, to);
1833 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1834
1835 if (ret == -ERESTARTNOHAND) {
1836 /*
1837 * Don't restore the signal mask yet. Let do_signal() deliver
1838 * the signal on the way back to userspace, before the signal
1839 * mask is restored.
1840 */
1841 if (sigmask) {
1842 memcpy(&current->saved_sigmask, &sigsaved,
1843 sizeof(sigsaved));
1844 set_restore_sigmask();
1845 }
1846 } else if (sigmask)
1847 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1848
1849 return ret;
1850 }
1851
1852 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1853 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1854 struct compat_timespec __user *tsp, void __user *sig)
1855 {
1856 compat_size_t sigsetsize = 0;
1857 compat_uptr_t up = 0;
1858
1859 if (sig) {
1860 if (!access_ok(VERIFY_READ, sig,
1861 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1862 __get_user(up, (compat_uptr_t __user *)sig) ||
1863 __get_user(sigsetsize,
1864 (compat_size_t __user *)(sig+sizeof(up))))
1865 return -EFAULT;
1866 }
1867 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1868 sigsetsize);
1869 }
1870
1871 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1872 unsigned int nfds, struct compat_timespec __user *tsp,
1873 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1874 {
1875 compat_sigset_t ss32;
1876 sigset_t ksigmask, sigsaved;
1877 struct compat_timespec ts;
1878 struct timespec end_time, *to = NULL;
1879 int ret;
1880
1881 if (tsp) {
1882 if (copy_from_user(&ts, tsp, sizeof(ts)))
1883 return -EFAULT;
1884
1885 to = &end_time;
1886 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1887 return -EINVAL;
1888 }
1889
1890 if (sigmask) {
1891 if (sigsetsize != sizeof(compat_sigset_t))
1892 return -EINVAL;
1893 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1894 return -EFAULT;
1895 sigset_from_compat(&ksigmask, &ss32);
1896
1897 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1898 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1899 }
1900
1901 ret = do_sys_poll(ufds, nfds, to);
1902
1903 /* We can restart this syscall, usually */
1904 if (ret == -EINTR) {
1905 /*
1906 * Don't restore the signal mask yet. Let do_signal() deliver
1907 * the signal on the way back to userspace, before the signal
1908 * mask is restored.
1909 */
1910 if (sigmask) {
1911 memcpy(&current->saved_sigmask, &sigsaved,
1912 sizeof(sigsaved));
1913 set_restore_sigmask();
1914 }
1915 ret = -ERESTARTNOHAND;
1916 } else if (sigmask)
1917 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1918
1919 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1920
1921 return ret;
1922 }
1923 #endif /* HAVE_SET_RESTORE_SIGMASK */
1924
1925 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1926 /* Stuff for NFS server syscalls... */
1927 struct compat_nfsctl_svc {
1928 u16 svc32_port;
1929 s32 svc32_nthreads;
1930 };
1931
1932 struct compat_nfsctl_client {
1933 s8 cl32_ident[NFSCLNT_IDMAX+1];
1934 s32 cl32_naddr;
1935 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1936 s32 cl32_fhkeytype;
1937 s32 cl32_fhkeylen;
1938 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1939 };
1940
1941 struct compat_nfsctl_export {
1942 char ex32_client[NFSCLNT_IDMAX+1];
1943 char ex32_path[NFS_MAXPATHLEN+1];
1944 compat_dev_t ex32_dev;
1945 compat_ino_t ex32_ino;
1946 compat_int_t ex32_flags;
1947 __compat_uid_t ex32_anon_uid;
1948 __compat_gid_t ex32_anon_gid;
1949 };
1950
1951 struct compat_nfsctl_fdparm {
1952 struct sockaddr gd32_addr;
1953 s8 gd32_path[NFS_MAXPATHLEN+1];
1954 compat_int_t gd32_version;
1955 };
1956
1957 struct compat_nfsctl_fsparm {
1958 struct sockaddr gd32_addr;
1959 s8 gd32_path[NFS_MAXPATHLEN+1];
1960 compat_int_t gd32_maxlen;
1961 };
1962
1963 struct compat_nfsctl_arg {
1964 compat_int_t ca32_version; /* safeguard */
1965 union {
1966 struct compat_nfsctl_svc u32_svc;
1967 struct compat_nfsctl_client u32_client;
1968 struct compat_nfsctl_export u32_export;
1969 struct compat_nfsctl_fdparm u32_getfd;
1970 struct compat_nfsctl_fsparm u32_getfs;
1971 } u;
1972 #define ca32_svc u.u32_svc
1973 #define ca32_client u.u32_client
1974 #define ca32_export u.u32_export
1975 #define ca32_getfd u.u32_getfd
1976 #define ca32_getfs u.u32_getfs
1977 };
1978
1979 union compat_nfsctl_res {
1980 __u8 cr32_getfh[NFS_FHSIZE];
1981 struct knfsd_fh cr32_getfs;
1982 };
1983
1984 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1985 struct compat_nfsctl_arg __user *arg)
1986 {
1987 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1988 get_user(karg->ca_version, &arg->ca32_version) ||
1989 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1990 __get_user(karg->ca_svc.svc_nthreads,
1991 &arg->ca32_svc.svc32_nthreads))
1992 return -EFAULT;
1993 return 0;
1994 }
1995
1996 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1997 struct compat_nfsctl_arg __user *arg)
1998 {
1999 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2000 sizeof(arg->ca32_client)) ||
2001 get_user(karg->ca_version, &arg->ca32_version) ||
2002 __copy_from_user(&karg->ca_client.cl_ident[0],
2003 &arg->ca32_client.cl32_ident[0],
2004 NFSCLNT_IDMAX) ||
2005 __get_user(karg->ca_client.cl_naddr,
2006 &arg->ca32_client.cl32_naddr) ||
2007 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2008 &arg->ca32_client.cl32_addrlist[0],
2009 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2010 __get_user(karg->ca_client.cl_fhkeytype,
2011 &arg->ca32_client.cl32_fhkeytype) ||
2012 __get_user(karg->ca_client.cl_fhkeylen,
2013 &arg->ca32_client.cl32_fhkeylen) ||
2014 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2015 &arg->ca32_client.cl32_fhkey[0],
2016 NFSCLNT_KEYMAX))
2017 return -EFAULT;
2018
2019 return 0;
2020 }
2021
2022 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2023 struct compat_nfsctl_arg __user *arg)
2024 {
2025 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2026 sizeof(arg->ca32_export)) ||
2027 get_user(karg->ca_version, &arg->ca32_version) ||
2028 __copy_from_user(&karg->ca_export.ex_client[0],
2029 &arg->ca32_export.ex32_client[0],
2030 NFSCLNT_IDMAX) ||
2031 __copy_from_user(&karg->ca_export.ex_path[0],
2032 &arg->ca32_export.ex32_path[0],
2033 NFS_MAXPATHLEN) ||
2034 __get_user(karg->ca_export.ex_dev,
2035 &arg->ca32_export.ex32_dev) ||
2036 __get_user(karg->ca_export.ex_ino,
2037 &arg->ca32_export.ex32_ino) ||
2038 __get_user(karg->ca_export.ex_flags,
2039 &arg->ca32_export.ex32_flags) ||
2040 __get_user(karg->ca_export.ex_anon_uid,
2041 &arg->ca32_export.ex32_anon_uid) ||
2042 __get_user(karg->ca_export.ex_anon_gid,
2043 &arg->ca32_export.ex32_anon_gid))
2044 return -EFAULT;
2045 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2046 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2047
2048 return 0;
2049 }
2050
2051 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2052 struct compat_nfsctl_arg __user *arg)
2053 {
2054 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2055 sizeof(arg->ca32_getfd)) ||
2056 get_user(karg->ca_version, &arg->ca32_version) ||
2057 __copy_from_user(&karg->ca_getfd.gd_addr,
2058 &arg->ca32_getfd.gd32_addr,
2059 (sizeof(struct sockaddr))) ||
2060 __copy_from_user(&karg->ca_getfd.gd_path,
2061 &arg->ca32_getfd.gd32_path,
2062 (NFS_MAXPATHLEN+1)) ||
2063 __get_user(karg->ca_getfd.gd_version,
2064 &arg->ca32_getfd.gd32_version))
2065 return -EFAULT;
2066
2067 return 0;
2068 }
2069
2070 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2071 struct compat_nfsctl_arg __user *arg)
2072 {
2073 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2074 get_user(karg->ca_version, &arg->ca32_version) ||
2075 __copy_from_user(&karg->ca_getfs.gd_addr,
2076 &arg->ca32_getfs.gd32_addr,
2077 (sizeof(struct sockaddr))) ||
2078 __copy_from_user(&karg->ca_getfs.gd_path,
2079 &arg->ca32_getfs.gd32_path,
2080 (NFS_MAXPATHLEN+1)) ||
2081 __get_user(karg->ca_getfs.gd_maxlen,
2082 &arg->ca32_getfs.gd32_maxlen))
2083 return -EFAULT;
2084
2085 return 0;
2086 }
2087
2088 /* This really doesn't need translations, we are only passing
2089 * back a union which contains opaque nfs file handle data.
2090 */
2091 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2092 union compat_nfsctl_res __user *res)
2093 {
2094 int err;
2095
2096 err = copy_to_user(res, kres, sizeof(*res));
2097
2098 return (err) ? -EFAULT : 0;
2099 }
2100
2101 asmlinkage long compat_sys_nfsservctl(int cmd,
2102 struct compat_nfsctl_arg __user *arg,
2103 union compat_nfsctl_res __user *res)
2104 {
2105 struct nfsctl_arg *karg;
2106 union nfsctl_res *kres;
2107 mm_segment_t oldfs;
2108 int err;
2109
2110 karg = kmalloc(sizeof(*karg), GFP_USER);
2111 kres = kmalloc(sizeof(*kres), GFP_USER);
2112 if(!karg || !kres) {
2113 err = -ENOMEM;
2114 goto done;
2115 }
2116
2117 switch(cmd) {
2118 case NFSCTL_SVC:
2119 err = compat_nfs_svc_trans(karg, arg);
2120 break;
2121
2122 case NFSCTL_ADDCLIENT:
2123 err = compat_nfs_clnt_trans(karg, arg);
2124 break;
2125
2126 case NFSCTL_DELCLIENT:
2127 err = compat_nfs_clnt_trans(karg, arg);
2128 break;
2129
2130 case NFSCTL_EXPORT:
2131 case NFSCTL_UNEXPORT:
2132 err = compat_nfs_exp_trans(karg, arg);
2133 break;
2134
2135 case NFSCTL_GETFD:
2136 err = compat_nfs_getfd_trans(karg, arg);
2137 break;
2138
2139 case NFSCTL_GETFS:
2140 err = compat_nfs_getfs_trans(karg, arg);
2141 break;
2142
2143 default:
2144 err = -EINVAL;
2145 break;
2146 }
2147
2148 if (err)
2149 goto done;
2150
2151 oldfs = get_fs();
2152 set_fs(KERNEL_DS);
2153 /* The __user pointer casts are valid because of the set_fs() */
2154 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2155 set_fs(oldfs);
2156
2157 if (err)
2158 goto done;
2159
2160 if((cmd == NFSCTL_GETFD) ||
2161 (cmd == NFSCTL_GETFS))
2162 err = compat_nfs_getfh_res_trans(kres, res);
2163
2164 done:
2165 kfree(karg);
2166 kfree(kres);
2167 return err;
2168 }
2169 #else /* !NFSD */
2170 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2171 {
2172 return sys_ni_syscall();
2173 }
2174 #endif
2175
2176 #ifdef CONFIG_EPOLL
2177
2178 #ifdef HAVE_SET_RESTORE_SIGMASK
2179 asmlinkage long compat_sys_epoll_pwait(int epfd,
2180 struct compat_epoll_event __user *events,
2181 int maxevents, int timeout,
2182 const compat_sigset_t __user *sigmask,
2183 compat_size_t sigsetsize)
2184 {
2185 long err;
2186 compat_sigset_t csigmask;
2187 sigset_t ksigmask, sigsaved;
2188
2189 /*
2190 * If the caller wants a certain signal mask to be set during the wait,
2191 * we apply it here.
2192 */
2193 if (sigmask) {
2194 if (sigsetsize != sizeof(compat_sigset_t))
2195 return -EINVAL;
2196 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2197 return -EFAULT;
2198 sigset_from_compat(&ksigmask, &csigmask);
2199 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2200 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2201 }
2202
2203 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2204
2205 /*
2206 * If we changed the signal mask, we need to restore the original one.
2207 * In case we've got a signal while waiting, we do not restore the
2208 * signal mask yet, and we allow do_signal() to deliver the signal on
2209 * the way back to userspace, before the signal mask is restored.
2210 */
2211 if (sigmask) {
2212 if (err == -EINTR) {
2213 memcpy(&current->saved_sigmask, &sigsaved,
2214 sizeof(sigsaved));
2215 set_restore_sigmask();
2216 } else
2217 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2218 }
2219
2220 return err;
2221 }
2222 #endif /* HAVE_SET_RESTORE_SIGMASK */
2223
2224 #endif /* CONFIG_EPOLL */
2225
2226 #ifdef CONFIG_SIGNALFD
2227
2228 asmlinkage long compat_sys_signalfd4(int ufd,
2229 const compat_sigset_t __user *sigmask,
2230 compat_size_t sigsetsize, int flags)
2231 {
2232 compat_sigset_t ss32;
2233 sigset_t tmp;
2234 sigset_t __user *ksigmask;
2235
2236 if (sigsetsize != sizeof(compat_sigset_t))
2237 return -EINVAL;
2238 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2239 return -EFAULT;
2240 sigset_from_compat(&tmp, &ss32);
2241 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2242 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2243 return -EFAULT;
2244
2245 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2246 }
2247
2248 asmlinkage long compat_sys_signalfd(int ufd,
2249 const compat_sigset_t __user *sigmask,
2250 compat_size_t sigsetsize)
2251 {
2252 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2253 }
2254 #endif /* CONFIG_SIGNALFD */
2255
2256 #ifdef CONFIG_TIMERFD
2257
2258 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2259 const struct compat_itimerspec __user *utmr,
2260 struct compat_itimerspec __user *otmr)
2261 {
2262 int error;
2263 struct itimerspec t;
2264 struct itimerspec __user *ut;
2265
2266 if (get_compat_itimerspec(&t, utmr))
2267 return -EFAULT;
2268 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2269 if (copy_to_user(&ut[0], &t, sizeof(t)))
2270 return -EFAULT;
2271 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2272 if (!error && otmr)
2273 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2274 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2275
2276 return error;
2277 }
2278
2279 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2280 struct compat_itimerspec __user *otmr)
2281 {
2282 int error;
2283 struct itimerspec t;
2284 struct itimerspec __user *ut;
2285
2286 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2287 error = sys_timerfd_gettime(ufd, ut);
2288 if (!error)
2289 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2290 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2291
2292 return error;
2293 }
2294
2295 #endif /* CONFIG_TIMERFD */
Linux 2.6 libata-dev (mirror)