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mm: avoid wrapping vm_pgoff in mremap()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / compat.c
blob691c3fd8ce1df11521ad678e611d5ffc23ad441c
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@ucw.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/stddef.h>
19 #include <linux/kernel.h>
20 #include <linux/linkage.h>
21 #include <linux/compat.h>
22 #include <linux/errno.h>
23 #include <linux/time.h>
24 #include <linux/fs.h>
25 #include <linux/fcntl.h>
26 #include <linux/namei.h>
27 #include <linux/file.h>
28 #include <linux/fdtable.h>
29 #include <linux/vfs.h>
30 #include <linux/ioctl.h>
31 #include <linux/init.h>
32 #include <linux/ncp_mount.h>
33 #include <linux/nfs4_mount.h>
34 #include <linux/syscalls.h>
35 #include <linux/ctype.h>
36 #include <linux/module.h>
37 #include <linux/dirent.h>
38 #include <linux/fsnotify.h>
39 #include <linux/highuid.h>
40 #include <linux/nfsd/syscall.h>
41 #include <linux/personality.h>
42 #include <linux/rwsem.h>
43 #include <linux/tsacct_kern.h>
44 #include <linux/security.h>
45 #include <linux/highmem.h>
46 #include <linux/signal.h>
47 #include <linux/poll.h>
48 #include <linux/mm.h>
49 #include <linux/eventpoll.h>
50 #include <linux/fs_struct.h>
51 #include <linux/slab.h>
52 #include <linux/pagemap.h>
53
54 #include <asm/uaccess.h>
55 #include <asm/mmu_context.h>
56 #include <asm/ioctls.h>
57 #include "internal.h"
58
59 int compat_log = 1;
60
61 int compat_printk(const char *fmt, ...)
62 {
63 va_list ap;
64 int ret;
65 if (!compat_log)
66 return 0;
67 va_start(ap, fmt);
68 ret = vprintk(fmt, ap);
69 va_end(ap);
70 return ret;
71 }
72
73 #include "read_write.h"
74
75 /*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
79 asmlinkage long compat_sys_utime(const char __user *filename,
80 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, const 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, const 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(const 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(const 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(const 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,
198 const char __user *filename,
199 struct compat_stat __user *statbuf, int flag)
200 {
201 struct kstat stat;
202 int error;
203
204 error = vfs_fstatat(dfd, filename, &stat, flag);
205 if (error)
206 return error;
207 return cp_compat_stat(&stat, statbuf);
208 }
209 #endif
210
211 asmlinkage long compat_sys_newfstat(unsigned int fd,
212 struct compat_stat __user * statbuf)
213 {
214 struct kstat stat;
215 int error = vfs_fstat(fd, &stat);
216
217 if (!error)
218 error = cp_compat_stat(&stat, statbuf);
219 return error;
220 }
221
222 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
223 {
224
225 if (sizeof ubuf->f_blocks == 4) {
226 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
227 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
228 return -EOVERFLOW;
229 /* f_files and f_ffree may be -1; it's okay
230 * to stuff that into 32 bits */
231 if (kbuf->f_files != 0xffffffffffffffffULL
232 && (kbuf->f_files & 0xffffffff00000000ULL))
233 return -EOVERFLOW;
234 if (kbuf->f_ffree != 0xffffffffffffffffULL
235 && (kbuf->f_ffree & 0xffffffff00000000ULL))
236 return -EOVERFLOW;
237 }
238 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
239 __put_user(kbuf->f_type, &ubuf->f_type) ||
240 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
241 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
242 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
243 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
244 __put_user(kbuf->f_files, &ubuf->f_files) ||
245 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
246 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
247 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
248 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
249 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
250 __put_user(0, &ubuf->f_spare[0]) ||
251 __put_user(0, &ubuf->f_spare[1]) ||
252 __put_user(0, &ubuf->f_spare[2]) ||
253 __put_user(0, &ubuf->f_spare[3]) ||
254 __put_user(0, &ubuf->f_spare[4]))
255 return -EFAULT;
256 return 0;
257 }
258
259 /*
260 * The following statfs calls are copies of code from fs/statfs.c and
261 * should be checked against those from time to time
262 */
263 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
264 {
265 struct path path;
266 int error;
267
268 error = user_path(pathname, &path);
269 if (!error) {
270 struct kstatfs tmp;
271 error = vfs_statfs(&path, &tmp);
272 if (!error)
273 error = put_compat_statfs(buf, &tmp);
274 path_put(&path);
275 }
276 return error;
277 }
278
279 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
280 {
281 struct file * file;
282 struct kstatfs tmp;
283 int error;
284
285 error = -EBADF;
286 file = fget(fd);
287 if (!file)
288 goto out;
289 error = vfs_statfs(&file->f_path, &tmp);
290 if (!error)
291 error = put_compat_statfs(buf, &tmp);
292 fput(file);
293 out:
294 return error;
295 }
296
297 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
298 {
299 if (sizeof ubuf->f_blocks == 4) {
300 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
301 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
302 return -EOVERFLOW;
303 /* f_files and f_ffree may be -1; it's okay
304 * to stuff that into 32 bits */
305 if (kbuf->f_files != 0xffffffffffffffffULL
306 && (kbuf->f_files & 0xffffffff00000000ULL))
307 return -EOVERFLOW;
308 if (kbuf->f_ffree != 0xffffffffffffffffULL
309 && (kbuf->f_ffree & 0xffffffff00000000ULL))
310 return -EOVERFLOW;
311 }
312 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
313 __put_user(kbuf->f_type, &ubuf->f_type) ||
314 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
315 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
316 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
317 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
318 __put_user(kbuf->f_files, &ubuf->f_files) ||
319 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
320 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
321 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
322 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
323 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
324 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
325 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
326 return -EFAULT;
327 return 0;
328 }
329
330 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
331 {
332 struct path path;
333 int error;
334
335 if (sz != sizeof(*buf))
336 return -EINVAL;
337
338 error = user_path(pathname, &path);
339 if (!error) {
340 struct kstatfs tmp;
341 error = vfs_statfs(&path, &tmp);
342 if (!error)
343 error = put_compat_statfs64(buf, &tmp);
344 path_put(&path);
345 }
346 return error;
347 }
348
349 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
350 {
351 struct file * file;
352 struct kstatfs tmp;
353 int error;
354
355 if (sz != sizeof(*buf))
356 return -EINVAL;
357
358 error = -EBADF;
359 file = fget(fd);
360 if (!file)
361 goto out;
362 error = vfs_statfs(&file->f_path, &tmp);
363 if (!error)
364 error = put_compat_statfs64(buf, &tmp);
365 fput(file);
366 out:
367 return error;
368 }
369
370 /*
371 * This is a copy of sys_ustat, just dealing with a structure layout.
372 * Given how simple this syscall is that apporach is more maintainable
373 * than the various conversion hacks.
374 */
375 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
376 {
377 struct super_block *sb;
378 struct compat_ustat tmp;
379 struct kstatfs sbuf;
380 int err;
381
382 sb = user_get_super(new_decode_dev(dev));
383 if (!sb)
384 return -EINVAL;
385 err = statfs_by_dentry(sb->s_root, &sbuf);
386 drop_super(sb);
387 if (err)
388 return err;
389
390 memset(&tmp, 0, sizeof(struct compat_ustat));
391 tmp.f_tfree = sbuf.f_bfree;
392 tmp.f_tinode = sbuf.f_ffree;
393 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
394 return -EFAULT;
395 return 0;
396 }
397
398 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
399 {
400 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
401 __get_user(kfl->l_type, &ufl->l_type) ||
402 __get_user(kfl->l_whence, &ufl->l_whence) ||
403 __get_user(kfl->l_start, &ufl->l_start) ||
404 __get_user(kfl->l_len, &ufl->l_len) ||
405 __get_user(kfl->l_pid, &ufl->l_pid))
406 return -EFAULT;
407 return 0;
408 }
409
410 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
411 {
412 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
413 __put_user(kfl->l_type, &ufl->l_type) ||
414 __put_user(kfl->l_whence, &ufl->l_whence) ||
415 __put_user(kfl->l_start, &ufl->l_start) ||
416 __put_user(kfl->l_len, &ufl->l_len) ||
417 __put_user(kfl->l_pid, &ufl->l_pid))
418 return -EFAULT;
419 return 0;
420 }
421
422 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
423 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
424 {
425 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
426 __get_user(kfl->l_type, &ufl->l_type) ||
427 __get_user(kfl->l_whence, &ufl->l_whence) ||
428 __get_user(kfl->l_start, &ufl->l_start) ||
429 __get_user(kfl->l_len, &ufl->l_len) ||
430 __get_user(kfl->l_pid, &ufl->l_pid))
431 return -EFAULT;
432 return 0;
433 }
434 #endif
435
436 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
437 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
438 {
439 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
440 __put_user(kfl->l_type, &ufl->l_type) ||
441 __put_user(kfl->l_whence, &ufl->l_whence) ||
442 __put_user(kfl->l_start, &ufl->l_start) ||
443 __put_user(kfl->l_len, &ufl->l_len) ||
444 __put_user(kfl->l_pid, &ufl->l_pid))
445 return -EFAULT;
446 return 0;
447 }
448 #endif
449
450 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
451 unsigned long arg)
452 {
453 mm_segment_t old_fs;
454 struct flock f;
455 long ret;
456
457 switch (cmd) {
458 case F_GETLK:
459 case F_SETLK:
460 case F_SETLKW:
461 ret = get_compat_flock(&f, compat_ptr(arg));
462 if (ret != 0)
463 break;
464 old_fs = get_fs();
465 set_fs(KERNEL_DS);
466 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
467 set_fs(old_fs);
468 if (cmd == F_GETLK && ret == 0) {
469 /* GETLK was successful and we need to return the data...
470 * but it needs to fit in the compat structure.
471 * l_start shouldn't be too big, unless the original
472 * start + end is greater than COMPAT_OFF_T_MAX, in which
473 * case the app was asking for trouble, so we return
474 * -EOVERFLOW in that case.
475 * l_len could be too big, in which case we just truncate it,
476 * and only allow the app to see that part of the conflicting
477 * lock that might make sense to it anyway
478 */
479
480 if (f.l_start > COMPAT_OFF_T_MAX)
481 ret = -EOVERFLOW;
482 if (f.l_len > COMPAT_OFF_T_MAX)
483 f.l_len = COMPAT_OFF_T_MAX;
484 if (ret == 0)
485 ret = put_compat_flock(&f, compat_ptr(arg));
486 }
487 break;
488
489 case F_GETLK64:
490 case F_SETLK64:
491 case F_SETLKW64:
492 ret = get_compat_flock64(&f, compat_ptr(arg));
493 if (ret != 0)
494 break;
495 old_fs = get_fs();
496 set_fs(KERNEL_DS);
497 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
498 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
499 (unsigned long)&f);
500 set_fs(old_fs);
501 if (cmd == F_GETLK64 && ret == 0) {
502 /* need to return lock information - see above for commentary */
503 if (f.l_start > COMPAT_LOFF_T_MAX)
504 ret = -EOVERFLOW;
505 if (f.l_len > COMPAT_LOFF_T_MAX)
506 f.l_len = COMPAT_LOFF_T_MAX;
507 if (ret == 0)
508 ret = put_compat_flock64(&f, compat_ptr(arg));
509 }
510 break;
511
512 default:
513 ret = sys_fcntl(fd, cmd, arg);
514 break;
515 }
516 return ret;
517 }
518
519 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
520 unsigned long arg)
521 {
522 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
523 return -EINVAL;
524 return compat_sys_fcntl64(fd, cmd, arg);
525 }
526
527 asmlinkage long
528 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
529 {
530 long ret;
531 aio_context_t ctx64;
532
533 mm_segment_t oldfs = get_fs();
534 if (unlikely(get_user(ctx64, ctx32p)))
535 return -EFAULT;
536
537 set_fs(KERNEL_DS);
538 /* The __user pointer cast is valid because of the set_fs() */
539 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
540 set_fs(oldfs);
541 /* truncating is ok because it's a user address */
542 if (!ret)
543 ret = put_user((u32) ctx64, ctx32p);
544 return ret;
545 }
546
547 asmlinkage long
548 compat_sys_io_getevents(aio_context_t ctx_id,
549 unsigned long min_nr,
550 unsigned long nr,
551 struct io_event __user *events,
552 struct compat_timespec __user *timeout)
553 {
554 long ret;
555 struct timespec t;
556 struct timespec __user *ut = NULL;
557
558 ret = -EFAULT;
559 if (unlikely(!access_ok(VERIFY_WRITE, events,
560 nr * sizeof(struct io_event))))
561 goto out;
562 if (timeout) {
563 if (get_compat_timespec(&t, timeout))
564 goto out;
565
566 ut = compat_alloc_user_space(sizeof(*ut));
567 if (copy_to_user(ut, &t, sizeof(t)) )
568 goto out;
569 }
570 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
571 out:
572 return ret;
573 }
574
575 /* A write operation does a read from user space and vice versa */
576 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
577
578 ssize_t compat_rw_copy_check_uvector(int type,
579 const struct compat_iovec __user *uvector, unsigned long nr_segs,
580 unsigned long fast_segs, struct iovec *fast_pointer,
581 struct iovec **ret_pointer)
582 {
583 compat_ssize_t tot_len;
584 struct iovec *iov = *ret_pointer = fast_pointer;
585 ssize_t ret = 0;
586 int seg;
587
588 /*
589 * SuS says "The readv() function *may* fail if the iovcnt argument
590 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
591 * traditionally returned zero for zero segments, so...
592 */
593 if (nr_segs == 0)
594 goto out;
595
596 ret = -EINVAL;
597 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
598 goto out;
599 if (nr_segs > fast_segs) {
600 ret = -ENOMEM;
601 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
602 if (iov == NULL)
603 goto out;
604 }
605 *ret_pointer = iov;
606
607 /*
608 * Single unix specification:
609 * We should -EINVAL if an element length is not >= 0 and fitting an
610 * ssize_t.
611 *
612 * In Linux, the total length is limited to MAX_RW_COUNT, there is
613 * no overflow possibility.
614 */
615 tot_len = 0;
616 ret = -EINVAL;
617 for (seg = 0; seg < nr_segs; seg++) {
618 compat_uptr_t buf;
619 compat_ssize_t len;
620
621 if (__get_user(len, &uvector->iov_len) ||
622 __get_user(buf, &uvector->iov_base)) {
623 ret = -EFAULT;
624 goto out;
625 }
626 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
627 goto out;
628 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
629 ret = -EFAULT;
630 goto out;
631 }
632 if (len > MAX_RW_COUNT - tot_len)
633 len = MAX_RW_COUNT - tot_len;
634 tot_len += len;
635 iov->iov_base = compat_ptr(buf);
636 iov->iov_len = (compat_size_t) len;
637 uvector++;
638 iov++;
639 }
640 ret = tot_len;
641
642 out:
643 return ret;
644 }
645
646 static inline long
647 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
648 {
649 compat_uptr_t uptr;
650 int i;
651
652 for (i = 0; i < nr; ++i) {
653 if (get_user(uptr, ptr32 + i))
654 return -EFAULT;
655 if (put_user(compat_ptr(uptr), ptr64 + i))
656 return -EFAULT;
657 }
658 return 0;
659 }
660
661 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
662
663 asmlinkage long
664 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
665 {
666 struct iocb __user * __user *iocb64;
667 long ret;
668
669 if (unlikely(nr < 0))
670 return -EINVAL;
671
672 if (nr > MAX_AIO_SUBMITS)
673 nr = MAX_AIO_SUBMITS;
674
675 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
676 ret = copy_iocb(nr, iocb, iocb64);
677 if (!ret)
678 ret = do_io_submit(ctx_id, nr, iocb64, 1);
679 return ret;
680 }
681
682 struct compat_ncp_mount_data {
683 compat_int_t version;
684 compat_uint_t ncp_fd;
685 __compat_uid_t mounted_uid;
686 compat_pid_t wdog_pid;
687 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
688 compat_uint_t time_out;
689 compat_uint_t retry_count;
690 compat_uint_t flags;
691 __compat_uid_t uid;
692 __compat_gid_t gid;
693 compat_mode_t file_mode;
694 compat_mode_t dir_mode;
695 };
696
697 struct compat_ncp_mount_data_v4 {
698 compat_int_t version;
699 compat_ulong_t flags;
700 compat_ulong_t mounted_uid;
701 compat_long_t wdog_pid;
702 compat_uint_t ncp_fd;
703 compat_uint_t time_out;
704 compat_uint_t retry_count;
705 compat_ulong_t uid;
706 compat_ulong_t gid;
707 compat_ulong_t file_mode;
708 compat_ulong_t dir_mode;
709 };
710
711 static void *do_ncp_super_data_conv(void *raw_data)
712 {
713 int version = *(unsigned int *)raw_data;
714
715 if (version == 3) {
716 struct compat_ncp_mount_data *c_n = raw_data;
717 struct ncp_mount_data *n = raw_data;
718
719 n->dir_mode = c_n->dir_mode;
720 n->file_mode = c_n->file_mode;
721 n->gid = c_n->gid;
722 n->uid = c_n->uid;
723 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
724 n->wdog_pid = c_n->wdog_pid;
725 n->mounted_uid = c_n->mounted_uid;
726 } else if (version == 4) {
727 struct compat_ncp_mount_data_v4 *c_n = raw_data;
728 struct ncp_mount_data_v4 *n = raw_data;
729
730 n->dir_mode = c_n->dir_mode;
731 n->file_mode = c_n->file_mode;
732 n->gid = c_n->gid;
733 n->uid = c_n->uid;
734 n->retry_count = c_n->retry_count;
735 n->time_out = c_n->time_out;
736 n->ncp_fd = c_n->ncp_fd;
737 n->wdog_pid = c_n->wdog_pid;
738 n->mounted_uid = c_n->mounted_uid;
739 n->flags = c_n->flags;
740 } else if (version != 5) {
741 return NULL;
742 }
743
744 return raw_data;
745 }
746
747
748 struct compat_nfs_string {
749 compat_uint_t len;
750 compat_uptr_t data;
751 };
752
753 static inline void compat_nfs_string(struct nfs_string *dst,
754 struct compat_nfs_string *src)
755 {
756 dst->data = compat_ptr(src->data);
757 dst->len = src->len;
758 }
759
760 struct compat_nfs4_mount_data_v1 {
761 compat_int_t version;
762 compat_int_t flags;
763 compat_int_t rsize;
764 compat_int_t wsize;
765 compat_int_t timeo;
766 compat_int_t retrans;
767 compat_int_t acregmin;
768 compat_int_t acregmax;
769 compat_int_t acdirmin;
770 compat_int_t acdirmax;
771 struct compat_nfs_string client_addr;
772 struct compat_nfs_string mnt_path;
773 struct compat_nfs_string hostname;
774 compat_uint_t host_addrlen;
775 compat_uptr_t host_addr;
776 compat_int_t proto;
777 compat_int_t auth_flavourlen;
778 compat_uptr_t auth_flavours;
779 };
780
781 static int do_nfs4_super_data_conv(void *raw_data)
782 {
783 int version = *(compat_uint_t *) raw_data;
784
785 if (version == 1) {
786 struct compat_nfs4_mount_data_v1 *raw = raw_data;
787 struct nfs4_mount_data *real = raw_data;
788
789 /* copy the fields backwards */
790 real->auth_flavours = compat_ptr(raw->auth_flavours);
791 real->auth_flavourlen = raw->auth_flavourlen;
792 real->proto = raw->proto;
793 real->host_addr = compat_ptr(raw->host_addr);
794 real->host_addrlen = raw->host_addrlen;
795 compat_nfs_string(&real->hostname, &raw->hostname);
796 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
797 compat_nfs_string(&real->client_addr, &raw->client_addr);
798 real->acdirmax = raw->acdirmax;
799 real->acdirmin = raw->acdirmin;
800 real->acregmax = raw->acregmax;
801 real->acregmin = raw->acregmin;
802 real->retrans = raw->retrans;
803 real->timeo = raw->timeo;
804 real->wsize = raw->wsize;
805 real->rsize = raw->rsize;
806 real->flags = raw->flags;
807 real->version = raw->version;
808 }
809
810 return 0;
811 }
812
813 #define NCPFS_NAME "ncpfs"
814 #define NFS4_NAME "nfs4"
815
816 asmlinkage long compat_sys_mount(const char __user * dev_name,
817 const char __user * dir_name,
818 const char __user * type, unsigned long flags,
819 const void __user * data)
820 {
821 char *kernel_type;
822 unsigned long data_page;
823 char *kernel_dev;
824 char *dir_page;
825 int retval;
826
827 retval = copy_mount_string(type, &kernel_type);
828 if (retval < 0)
829 goto out;
830
831 dir_page = getname(dir_name);
832 retval = PTR_ERR(dir_page);
833 if (IS_ERR(dir_page))
834 goto out1;
835
836 retval = copy_mount_string(dev_name, &kernel_dev);
837 if (retval < 0)
838 goto out2;
839
840 retval = copy_mount_options(data, &data_page);
841 if (retval < 0)
842 goto out3;
843
844 retval = -EINVAL;
845
846 if (kernel_type && data_page) {
847 if (!strcmp(kernel_type, NCPFS_NAME)) {
848 do_ncp_super_data_conv((void *)data_page);
849 } else if (!strcmp(kernel_type, NFS4_NAME)) {
850 if (do_nfs4_super_data_conv((void *) data_page))
851 goto out4;
852 }
853 }
854
855 retval = do_mount(kernel_dev, dir_page, kernel_type,
856 flags, (void*)data_page);
857
858 out4:
859 free_page(data_page);
860 out3:
861 kfree(kernel_dev);
862 out2:
863 putname(dir_page);
864 out1:
865 kfree(kernel_type);
866 out:
867 return retval;
868 }
869
870 struct compat_old_linux_dirent {
871 compat_ulong_t d_ino;
872 compat_ulong_t d_offset;
873 unsigned short d_namlen;
874 char d_name[1];
875 };
876
877 struct compat_readdir_callback {
878 struct compat_old_linux_dirent __user *dirent;
879 int result;
880 };
881
882 static int compat_fillonedir(void *__buf, const char *name, int namlen,
883 loff_t offset, u64 ino, unsigned int d_type)
884 {
885 struct compat_readdir_callback *buf = __buf;
886 struct compat_old_linux_dirent __user *dirent;
887 compat_ulong_t d_ino;
888
889 if (buf->result)
890 return -EINVAL;
891 d_ino = ino;
892 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
893 buf->result = -EOVERFLOW;
894 return -EOVERFLOW;
895 }
896 buf->result++;
897 dirent = buf->dirent;
898 if (!access_ok(VERIFY_WRITE, dirent,
899 (unsigned long)(dirent->d_name + namlen + 1) -
900 (unsigned long)dirent))
901 goto efault;
902 if ( __put_user(d_ino, &dirent->d_ino) ||
903 __put_user(offset, &dirent->d_offset) ||
904 __put_user(namlen, &dirent->d_namlen) ||
905 __copy_to_user(dirent->d_name, name, namlen) ||
906 __put_user(0, dirent->d_name + namlen))
907 goto efault;
908 return 0;
909 efault:
910 buf->result = -EFAULT;
911 return -EFAULT;
912 }
913
914 asmlinkage long compat_sys_old_readdir(unsigned int fd,
915 struct compat_old_linux_dirent __user *dirent, unsigned int count)
916 {
917 int error;
918 struct file *file;
919 struct compat_readdir_callback buf;
920
921 error = -EBADF;
922 file = fget(fd);
923 if (!file)
924 goto out;
925
926 buf.result = 0;
927 buf.dirent = dirent;
928
929 error = vfs_readdir(file, compat_fillonedir, &buf);
930 if (buf.result)
931 error = buf.result;
932
933 fput(file);
934 out:
935 return error;
936 }
937
938 struct compat_linux_dirent {
939 compat_ulong_t d_ino;
940 compat_ulong_t d_off;
941 unsigned short d_reclen;
942 char d_name[1];
943 };
944
945 struct compat_getdents_callback {
946 struct compat_linux_dirent __user *current_dir;
947 struct compat_linux_dirent __user *previous;
948 int count;
949 int error;
950 };
951
952 static int compat_filldir(void *__buf, const char *name, int namlen,
953 loff_t offset, u64 ino, unsigned int d_type)
954 {
955 struct compat_linux_dirent __user * dirent;
956 struct compat_getdents_callback *buf = __buf;
957 compat_ulong_t d_ino;
958 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
959 namlen + 2, sizeof(compat_long_t));
960
961 buf->error = -EINVAL; /* only used if we fail.. */
962 if (reclen > buf->count)
963 return -EINVAL;
964 d_ino = ino;
965 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
966 buf->error = -EOVERFLOW;
967 return -EOVERFLOW;
968 }
969 dirent = buf->previous;
970 if (dirent) {
971 if (__put_user(offset, &dirent->d_off))
972 goto efault;
973 }
974 dirent = buf->current_dir;
975 if (__put_user(d_ino, &dirent->d_ino))
976 goto efault;
977 if (__put_user(reclen, &dirent->d_reclen))
978 goto efault;
979 if (copy_to_user(dirent->d_name, name, namlen))
980 goto efault;
981 if (__put_user(0, dirent->d_name + namlen))
982 goto efault;
983 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
984 goto efault;
985 buf->previous = dirent;
986 dirent = (void __user *)dirent + reclen;
987 buf->current_dir = dirent;
988 buf->count -= reclen;
989 return 0;
990 efault:
991 buf->error = -EFAULT;
992 return -EFAULT;
993 }
994
995 asmlinkage long compat_sys_getdents(unsigned int fd,
996 struct compat_linux_dirent __user *dirent, unsigned int count)
997 {
998 struct file * file;
999 struct compat_linux_dirent __user * lastdirent;
1000 struct compat_getdents_callback buf;
1001 int error;
1002
1003 error = -EFAULT;
1004 if (!access_ok(VERIFY_WRITE, dirent, count))
1005 goto out;
1006
1007 error = -EBADF;
1008 file = fget(fd);
1009 if (!file)
1010 goto out;
1011
1012 buf.current_dir = dirent;
1013 buf.previous = NULL;
1014 buf.count = count;
1015 buf.error = 0;
1016
1017 error = vfs_readdir(file, compat_filldir, &buf);
1018 if (error >= 0)
1019 error = buf.error;
1020 lastdirent = buf.previous;
1021 if (lastdirent) {
1022 if (put_user(file->f_pos, &lastdirent->d_off))
1023 error = -EFAULT;
1024 else
1025 error = count - buf.count;
1026 }
1027 fput(file);
1028 out:
1029 return error;
1030 }
1031
1032 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1033
1034 struct compat_getdents_callback64 {
1035 struct linux_dirent64 __user *current_dir;
1036 struct linux_dirent64 __user *previous;
1037 int count;
1038 int error;
1039 };
1040
1041 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1042 u64 ino, unsigned int d_type)
1043 {
1044 struct linux_dirent64 __user *dirent;
1045 struct compat_getdents_callback64 *buf = __buf;
1046 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1047 sizeof(u64));
1048 u64 off;
1049
1050 buf->error = -EINVAL; /* only used if we fail.. */
1051 if (reclen > buf->count)
1052 return -EINVAL;
1053 dirent = buf->previous;
1054
1055 if (dirent) {
1056 if (__put_user_unaligned(offset, &dirent->d_off))
1057 goto efault;
1058 }
1059 dirent = buf->current_dir;
1060 if (__put_user_unaligned(ino, &dirent->d_ino))
1061 goto efault;
1062 off = 0;
1063 if (__put_user_unaligned(off, &dirent->d_off))
1064 goto efault;
1065 if (__put_user(reclen, &dirent->d_reclen))
1066 goto efault;
1067 if (__put_user(d_type, &dirent->d_type))
1068 goto efault;
1069 if (copy_to_user(dirent->d_name, name, namlen))
1070 goto efault;
1071 if (__put_user(0, dirent->d_name + namlen))
1072 goto efault;
1073 buf->previous = dirent;
1074 dirent = (void __user *)dirent + reclen;
1075 buf->current_dir = dirent;
1076 buf->count -= reclen;
1077 return 0;
1078 efault:
1079 buf->error = -EFAULT;
1080 return -EFAULT;
1081 }
1082
1083 asmlinkage long compat_sys_getdents64(unsigned int fd,
1084 struct linux_dirent64 __user * dirent, unsigned int count)
1085 {
1086 struct file * file;
1087 struct linux_dirent64 __user * lastdirent;
1088 struct compat_getdents_callback64 buf;
1089 int error;
1090
1091 error = -EFAULT;
1092 if (!access_ok(VERIFY_WRITE, dirent, count))
1093 goto out;
1094
1095 error = -EBADF;
1096 file = fget(fd);
1097 if (!file)
1098 goto out;
1099
1100 buf.current_dir = dirent;
1101 buf.previous = NULL;
1102 buf.count = count;
1103 buf.error = 0;
1104
1105 error = vfs_readdir(file, compat_filldir64, &buf);
1106 if (error >= 0)
1107 error = buf.error;
1108 lastdirent = buf.previous;
1109 if (lastdirent) {
1110 typeof(lastdirent->d_off) d_off = file->f_pos;
1111 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1112 error = -EFAULT;
1113 else
1114 error = count - buf.count;
1115 }
1116 fput(file);
1117 out:
1118 return error;
1119 }
1120 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1121
1122 static ssize_t compat_do_readv_writev(int type, struct file *file,
1123 const struct compat_iovec __user *uvector,
1124 unsigned long nr_segs, loff_t *pos)
1125 {
1126 compat_ssize_t tot_len;
1127 struct iovec iovstack[UIO_FASTIOV];
1128 struct iovec *iov = iovstack;
1129 ssize_t ret;
1130 io_fn_t fn;
1131 iov_fn_t fnv;
1132
1133 ret = -EINVAL;
1134 if (!file->f_op)
1135 goto out;
1136
1137 ret = -EFAULT;
1138 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1139 goto out;
1140
1141 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1142 UIO_FASTIOV, iovstack, &iov);
1143 if (tot_len == 0) {
1144 ret = 0;
1145 goto out;
1146 }
1147
1148 ret = rw_verify_area(type, file, pos, tot_len);
1149 if (ret < 0)
1150 goto out;
1151
1152 fnv = NULL;
1153 if (type == READ) {
1154 fn = file->f_op->read;
1155 fnv = file->f_op->aio_read;
1156 } else {
1157 fn = (io_fn_t)file->f_op->write;
1158 fnv = file->f_op->aio_write;
1159 }
1160
1161 if (fnv)
1162 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1163 pos, fnv);
1164 else
1165 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1166
1167 out:
1168 if (iov != iovstack)
1169 kfree(iov);
1170 if ((ret + (type == READ)) > 0) {
1171 if (type == READ)
1172 fsnotify_access(file);
1173 else
1174 fsnotify_modify(file);
1175 }
1176 return ret;
1177 }
1178
1179 static size_t compat_readv(struct file *file,
1180 const struct compat_iovec __user *vec,
1181 unsigned long vlen, loff_t *pos)
1182 {
1183 ssize_t ret = -EBADF;
1184
1185 if (!(file->f_mode & FMODE_READ))
1186 goto out;
1187
1188 ret = -EINVAL;
1189 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1190 goto out;
1191
1192 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1193
1194 out:
1195 if (ret > 0)
1196 add_rchar(current, ret);
1197 inc_syscr(current);
1198 return ret;
1199 }
1200
1201 asmlinkage ssize_t
1202 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1203 unsigned long vlen)
1204 {
1205 struct file *file;
1206 int fput_needed;
1207 ssize_t ret;
1208
1209 file = fget_light(fd, &fput_needed);
1210 if (!file)
1211 return -EBADF;
1212 ret = compat_readv(file, vec, vlen, &file->f_pos);
1213 fput_light(file, fput_needed);
1214 return ret;
1215 }
1216
1217 asmlinkage ssize_t
1218 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1219 unsigned long vlen, u32 pos_low, u32 pos_high)
1220 {
1221 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1222 struct file *file;
1223 int fput_needed;
1224 ssize_t ret;
1225
1226 if (pos < 0)
1227 return -EINVAL;
1228 file = fget_light(fd, &fput_needed);
1229 if (!file)
1230 return -EBADF;
1231 ret = -ESPIPE;
1232 if (file->f_mode & FMODE_PREAD)
1233 ret = compat_readv(file, vec, vlen, &pos);
1234 fput_light(file, fput_needed);
1235 return ret;
1236 }
1237
1238 static size_t compat_writev(struct file *file,
1239 const struct compat_iovec __user *vec,
1240 unsigned long vlen, loff_t *pos)
1241 {
1242 ssize_t ret = -EBADF;
1243
1244 if (!(file->f_mode & FMODE_WRITE))
1245 goto out;
1246
1247 ret = -EINVAL;
1248 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1249 goto out;
1250
1251 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1252
1253 out:
1254 if (ret > 0)
1255 add_wchar(current, ret);
1256 inc_syscw(current);
1257 return ret;
1258 }
1259
1260 asmlinkage ssize_t
1261 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1262 unsigned long vlen)
1263 {
1264 struct file *file;
1265 int fput_needed;
1266 ssize_t ret;
1267
1268 file = fget_light(fd, &fput_needed);
1269 if (!file)
1270 return -EBADF;
1271 ret = compat_writev(file, vec, vlen, &file->f_pos);
1272 fput_light(file, fput_needed);
1273 return ret;
1274 }
1275
1276 asmlinkage ssize_t
1277 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1278 unsigned long vlen, u32 pos_low, u32 pos_high)
1279 {
1280 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1281 struct file *file;
1282 int fput_needed;
1283 ssize_t ret;
1284
1285 if (pos < 0)
1286 return -EINVAL;
1287 file = fget_light(fd, &fput_needed);
1288 if (!file)
1289 return -EBADF;
1290 ret = -ESPIPE;
1291 if (file->f_mode & FMODE_PWRITE)
1292 ret = compat_writev(file, vec, vlen, &pos);
1293 fput_light(file, fput_needed);
1294 return ret;
1295 }
1296
1297 asmlinkage long
1298 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1299 unsigned int nr_segs, unsigned int flags)
1300 {
1301 unsigned i;
1302 struct iovec __user *iov;
1303 if (nr_segs > UIO_MAXIOV)
1304 return -EINVAL;
1305 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1306 for (i = 0; i < nr_segs; i++) {
1307 struct compat_iovec v;
1308 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1309 get_user(v.iov_len, &iov32[i].iov_len) ||
1310 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1311 put_user(v.iov_len, &iov[i].iov_len))
1312 return -EFAULT;
1313 }
1314 return sys_vmsplice(fd, iov, nr_segs, flags);
1315 }
1316
1317 /*
1318 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1319 * O_LARGEFILE flag.
1320 */
1321 asmlinkage long
1322 compat_sys_open(const char __user *filename, int flags, int mode)
1323 {
1324 return do_sys_open(AT_FDCWD, filename, flags, mode);
1325 }
1326
1327 /*
1328 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1329 * O_LARGEFILE flag.
1330 */
1331 asmlinkage long
1332 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1333 {
1334 return do_sys_open(dfd, filename, flags, mode);
1335 }
1336
1337 /*
1338 * compat_count() counts the number of arguments/envelopes. It is basically
1339 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1340 * and envp pointers.
1341 */
1342 static int compat_count(compat_uptr_t __user *argv, int max)
1343 {
1344 int i = 0;
1345
1346 if (argv != NULL) {
1347 for (;;) {
1348 compat_uptr_t p;
1349
1350 if (get_user(p, argv))
1351 return -EFAULT;
1352 if (!p)
1353 break;
1354 argv++;
1355 if (i++ >= max)
1356 return -E2BIG;
1357
1358 if (fatal_signal_pending(current))
1359 return -ERESTARTNOHAND;
1360 cond_resched();
1361 }
1362 }
1363 return i;
1364 }
1365
1366 /*
1367 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1368 * except that it works with 32 bit argv and envp pointers.
1369 */
1370 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1371 struct linux_binprm *bprm)
1372 {
1373 struct page *kmapped_page = NULL;
1374 char *kaddr = NULL;
1375 unsigned long kpos = 0;
1376 int ret;
1377
1378 while (argc-- > 0) {
1379 compat_uptr_t str;
1380 int len;
1381 unsigned long pos;
1382
1383 if (get_user(str, argv+argc) ||
1384 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1385 ret = -EFAULT;
1386 goto out;
1387 }
1388
1389 if (len > MAX_ARG_STRLEN) {
1390 ret = -E2BIG;
1391 goto out;
1392 }
1393
1394 /* We're going to work our way backwords. */
1395 pos = bprm->p;
1396 str += len;
1397 bprm->p -= len;
1398
1399 while (len > 0) {
1400 int offset, bytes_to_copy;
1401
1402 if (fatal_signal_pending(current)) {
1403 ret = -ERESTARTNOHAND;
1404 goto out;
1405 }
1406 cond_resched();
1407
1408 offset = pos % PAGE_SIZE;
1409 if (offset == 0)
1410 offset = PAGE_SIZE;
1411
1412 bytes_to_copy = offset;
1413 if (bytes_to_copy > len)
1414 bytes_to_copy = len;
1415
1416 offset -= bytes_to_copy;
1417 pos -= bytes_to_copy;
1418 str -= bytes_to_copy;
1419 len -= bytes_to_copy;
1420
1421 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1422 struct page *page;
1423
1424 page = get_arg_page(bprm, pos, 1);
1425 if (!page) {
1426 ret = -E2BIG;
1427 goto out;
1428 }
1429
1430 if (kmapped_page) {
1431 flush_kernel_dcache_page(kmapped_page);
1432 kunmap(kmapped_page);
1433 put_page(kmapped_page);
1434 }
1435 kmapped_page = page;
1436 kaddr = kmap(kmapped_page);
1437 kpos = pos & PAGE_MASK;
1438 flush_cache_page(bprm->vma, kpos,
1439 page_to_pfn(kmapped_page));
1440 }
1441 if (copy_from_user(kaddr+offset, compat_ptr(str),
1442 bytes_to_copy)) {
1443 ret = -EFAULT;
1444 goto out;
1445 }
1446 }
1447 }
1448 ret = 0;
1449 out:
1450 if (kmapped_page) {
1451 flush_kernel_dcache_page(kmapped_page);
1452 kunmap(kmapped_page);
1453 put_page(kmapped_page);
1454 }
1455 return ret;
1456 }
1457
1458 /*
1459 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1460 * that it processes 32 bit argv and envp pointers.
1461 */
1462 int compat_do_execve(char * filename,
1463 compat_uptr_t __user *argv,
1464 compat_uptr_t __user *envp,
1465 struct pt_regs * regs)
1466 {
1467 struct linux_binprm *bprm;
1468 struct file *file;
1469 struct files_struct *displaced;
1470 bool clear_in_exec;
1471 int retval;
1472
1473 retval = unshare_files(&displaced);
1474 if (retval)
1475 goto out_ret;
1476
1477 retval = -ENOMEM;
1478 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1479 if (!bprm)
1480 goto out_files;
1481
1482 retval = prepare_bprm_creds(bprm);
1483 if (retval)
1484 goto out_free;
1485
1486 retval = check_unsafe_exec(bprm);
1487 if (retval < 0)
1488 goto out_free;
1489 clear_in_exec = retval;
1490 current->in_execve = 1;
1491
1492 file = open_exec(filename);
1493 retval = PTR_ERR(file);
1494 if (IS_ERR(file))
1495 goto out_unmark;
1496
1497 sched_exec();
1498
1499 bprm->file = file;
1500 bprm->filename = filename;
1501 bprm->interp = filename;
1502
1503 retval = bprm_mm_init(bprm);
1504 if (retval)
1505 goto out_file;
1506
1507 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1508 if ((retval = bprm->argc) < 0)
1509 goto out;
1510
1511 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1512 if ((retval = bprm->envc) < 0)
1513 goto out;
1514
1515 retval = prepare_binprm(bprm);
1516 if (retval < 0)
1517 goto out;
1518
1519 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1520 if (retval < 0)
1521 goto out;
1522
1523 bprm->exec = bprm->p;
1524 retval = compat_copy_strings(bprm->envc, envp, bprm);
1525 if (retval < 0)
1526 goto out;
1527
1528 retval = compat_copy_strings(bprm->argc, argv, bprm);
1529 if (retval < 0)
1530 goto out;
1531
1532 retval = search_binary_handler(bprm, regs);
1533 if (retval < 0)
1534 goto out;
1535
1536 /* execve succeeded */
1537 current->fs->in_exec = 0;
1538 current->in_execve = 0;
1539 acct_update_integrals(current);
1540 free_bprm(bprm);
1541 if (displaced)
1542 put_files_struct(displaced);
1543 return retval;
1544
1545 out:
1546 if (bprm->mm) {
1547 acct_arg_size(bprm, 0);
1548 mmput(bprm->mm);
1549 }
1550
1551 out_file:
1552 if (bprm->file) {
1553 allow_write_access(bprm->file);
1554 fput(bprm->file);
1555 }
1556
1557 out_unmark:
1558 if (clear_in_exec)
1559 current->fs->in_exec = 0;
1560 current->in_execve = 0;
1561
1562 out_free:
1563 free_bprm(bprm);
1564
1565 out_files:
1566 if (displaced)
1567 reset_files_struct(displaced);
1568 out_ret:
1569 return retval;
1570 }
1571
1572 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1573
1574 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1575 int timeval, int ret)
1576 {
1577 struct timespec ts;
1578
1579 if (!p)
1580 return ret;
1581
1582 if (current->personality & STICKY_TIMEOUTS)
1583 goto sticky;
1584
1585 /* No update for zero timeout */
1586 if (!end_time->tv_sec && !end_time->tv_nsec)
1587 return ret;
1588
1589 ktime_get_ts(&ts);
1590 ts = timespec_sub(*end_time, ts);
1591 if (ts.tv_sec < 0)
1592 ts.tv_sec = ts.tv_nsec = 0;
1593
1594 if (timeval) {
1595 struct compat_timeval rtv;
1596
1597 rtv.tv_sec = ts.tv_sec;
1598 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1599
1600 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1601 return ret;
1602 } else {
1603 struct compat_timespec rts;
1604
1605 rts.tv_sec = ts.tv_sec;
1606 rts.tv_nsec = ts.tv_nsec;
1607
1608 if (!copy_to_user(p, &rts, sizeof(rts)))
1609 return ret;
1610 }
1611 /*
1612 * If an application puts its timeval in read-only memory, we
1613 * don't want the Linux-specific update to the timeval to
1614 * cause a fault after the select has completed
1615 * successfully. However, because we're not updating the
1616 * timeval, we can't restart the system call.
1617 */
1618
1619 sticky:
1620 if (ret == -ERESTARTNOHAND)
1621 ret = -EINTR;
1622 return ret;
1623 }
1624
1625 /*
1626 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1627 * 64-bit unsigned longs.
1628 */
1629 static
1630 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1631 unsigned long *fdset)
1632 {
1633 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1634 if (ufdset) {
1635 unsigned long odd;
1636
1637 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1638 return -EFAULT;
1639
1640 odd = nr & 1UL;
1641 nr &= ~1UL;
1642 while (nr) {
1643 unsigned long h, l;
1644 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1645 return -EFAULT;
1646 ufdset += 2;
1647 *fdset++ = h << 32 | l;
1648 nr -= 2;
1649 }
1650 if (odd && __get_user(*fdset, ufdset))
1651 return -EFAULT;
1652 } else {
1653 /* Tricky, must clear full unsigned long in the
1654 * kernel fdset at the end, this makes sure that
1655 * actually happens.
1656 */
1657 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1658 }
1659 return 0;
1660 }
1661
1662 static
1663 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1664 unsigned long *fdset)
1665 {
1666 unsigned long odd;
1667 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1668
1669 if (!ufdset)
1670 return 0;
1671
1672 odd = nr & 1UL;
1673 nr &= ~1UL;
1674 while (nr) {
1675 unsigned long h, l;
1676 l = *fdset++;
1677 h = l >> 32;
1678 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1679 return -EFAULT;
1680 ufdset += 2;
1681 nr -= 2;
1682 }
1683 if (odd && __put_user(*fdset, ufdset))
1684 return -EFAULT;
1685 return 0;
1686 }
1687
1688
1689 /*
1690 * This is a virtual copy of sys_select from fs/select.c and probably
1691 * should be compared to it from time to time
1692 */
1693
1694 /*
1695 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1696 * like to be certain this leads to no problems. So I return
1697 * EINTR just for safety.
1698 *
1699 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1700 * I'm trying ERESTARTNOHAND which restart only when you want to.
1701 */
1702 #define MAX_SELECT_SECONDS \
1703 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1704
1705 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1706 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1707 struct timespec *end_time)
1708 {
1709 fd_set_bits fds;
1710 void *bits;
1711 int size, max_fds, ret = -EINVAL;
1712 struct fdtable *fdt;
1713 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1714
1715 if (n < 0)
1716 goto out_nofds;
1717
1718 /* max_fds can increase, so grab it once to avoid race */
1719 rcu_read_lock();
1720 fdt = files_fdtable(current->files);
1721 max_fds = fdt->max_fds;
1722 rcu_read_unlock();
1723 if (n > max_fds)
1724 n = max_fds;
1725
1726 /*
1727 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1728 * since we used fdset we need to allocate memory in units of
1729 * long-words.
1730 */
1731 size = FDS_BYTES(n);
1732 bits = stack_fds;
1733 if (size > sizeof(stack_fds) / 6) {
1734 bits = kmalloc(6 * size, GFP_KERNEL);
1735 ret = -ENOMEM;
1736 if (!bits)
1737 goto out_nofds;
1738 }
1739 fds.in = (unsigned long *) bits;
1740 fds.out = (unsigned long *) (bits + size);
1741 fds.ex = (unsigned long *) (bits + 2*size);
1742 fds.res_in = (unsigned long *) (bits + 3*size);
1743 fds.res_out = (unsigned long *) (bits + 4*size);
1744 fds.res_ex = (unsigned long *) (bits + 5*size);
1745
1746 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1747 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1748 (ret = compat_get_fd_set(n, exp, fds.ex)))
1749 goto out;
1750 zero_fd_set(n, fds.res_in);
1751 zero_fd_set(n, fds.res_out);
1752 zero_fd_set(n, fds.res_ex);
1753
1754 ret = do_select(n, &fds, end_time);
1755
1756 if (ret < 0)
1757 goto out;
1758 if (!ret) {
1759 ret = -ERESTARTNOHAND;
1760 if (signal_pending(current))
1761 goto out;
1762 ret = 0;
1763 }
1764
1765 if (compat_set_fd_set(n, inp, fds.res_in) ||
1766 compat_set_fd_set(n, outp, fds.res_out) ||
1767 compat_set_fd_set(n, exp, fds.res_ex))
1768 ret = -EFAULT;
1769 out:
1770 if (bits != stack_fds)
1771 kfree(bits);
1772 out_nofds:
1773 return ret;
1774 }
1775
1776 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1777 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1778 struct compat_timeval __user *tvp)
1779 {
1780 struct timespec end_time, *to = NULL;
1781 struct compat_timeval tv;
1782 int ret;
1783
1784 if (tvp) {
1785 if (copy_from_user(&tv, tvp, sizeof(tv)))
1786 return -EFAULT;
1787
1788 to = &end_time;
1789 if (poll_select_set_timeout(to,
1790 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1791 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1792 return -EINVAL;
1793 }
1794
1795 ret = compat_core_sys_select(n, inp, outp, exp, to);
1796 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1797
1798 return ret;
1799 }
1800
1801 struct compat_sel_arg_struct {
1802 compat_ulong_t n;
1803 compat_uptr_t inp;
1804 compat_uptr_t outp;
1805 compat_uptr_t exp;
1806 compat_uptr_t tvp;
1807 };
1808
1809 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1810 {
1811 struct compat_sel_arg_struct a;
1812
1813 if (copy_from_user(&a, arg, sizeof(a)))
1814 return -EFAULT;
1815 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1816 compat_ptr(a.exp), compat_ptr(a.tvp));
1817 }
1818
1819 #ifdef HAVE_SET_RESTORE_SIGMASK
1820 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1821 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1822 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1823 compat_size_t sigsetsize)
1824 {
1825 compat_sigset_t ss32;
1826 sigset_t ksigmask, sigsaved;
1827 struct compat_timespec ts;
1828 struct timespec end_time, *to = NULL;
1829 int ret;
1830
1831 if (tsp) {
1832 if (copy_from_user(&ts, tsp, sizeof(ts)))
1833 return -EFAULT;
1834
1835 to = &end_time;
1836 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1837 return -EINVAL;
1838 }
1839
1840 if (sigmask) {
1841 if (sigsetsize != sizeof(compat_sigset_t))
1842 return -EINVAL;
1843 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1844 return -EFAULT;
1845 sigset_from_compat(&ksigmask, &ss32);
1846
1847 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1848 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1849 }
1850
1851 ret = compat_core_sys_select(n, inp, outp, exp, to);
1852 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1853
1854 if (ret == -ERESTARTNOHAND) {
1855 /*
1856 * Don't restore the signal mask yet. Let do_signal() deliver
1857 * the signal on the way back to userspace, before the signal
1858 * mask is restored.
1859 */
1860 if (sigmask) {
1861 memcpy(&current->saved_sigmask, &sigsaved,
1862 sizeof(sigsaved));
1863 set_restore_sigmask();
1864 }
1865 } else if (sigmask)
1866 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1867
1868 return ret;
1869 }
1870
1871 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1872 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1873 struct compat_timespec __user *tsp, void __user *sig)
1874 {
1875 compat_size_t sigsetsize = 0;
1876 compat_uptr_t up = 0;
1877
1878 if (sig) {
1879 if (!access_ok(VERIFY_READ, sig,
1880 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1881 __get_user(up, (compat_uptr_t __user *)sig) ||
1882 __get_user(sigsetsize,
1883 (compat_size_t __user *)(sig+sizeof(up))))
1884 return -EFAULT;
1885 }
1886 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1887 sigsetsize);
1888 }
1889
1890 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1891 unsigned int nfds, struct compat_timespec __user *tsp,
1892 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1893 {
1894 compat_sigset_t ss32;
1895 sigset_t ksigmask, sigsaved;
1896 struct compat_timespec ts;
1897 struct timespec end_time, *to = NULL;
1898 int ret;
1899
1900 if (tsp) {
1901 if (copy_from_user(&ts, tsp, sizeof(ts)))
1902 return -EFAULT;
1903
1904 to = &end_time;
1905 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1906 return -EINVAL;
1907 }
1908
1909 if (sigmask) {
1910 if (sigsetsize != sizeof(compat_sigset_t))
1911 return -EINVAL;
1912 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1913 return -EFAULT;
1914 sigset_from_compat(&ksigmask, &ss32);
1915
1916 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1917 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1918 }
1919
1920 ret = do_sys_poll(ufds, nfds, to);
1921
1922 /* We can restart this syscall, usually */
1923 if (ret == -EINTR) {
1924 /*
1925 * Don't restore the signal mask yet. Let do_signal() deliver
1926 * the signal on the way back to userspace, before the signal
1927 * mask is restored.
1928 */
1929 if (sigmask) {
1930 memcpy(&current->saved_sigmask, &sigsaved,
1931 sizeof(sigsaved));
1932 set_restore_sigmask();
1933 }
1934 ret = -ERESTARTNOHAND;
1935 } else if (sigmask)
1936 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1937
1938 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1939
1940 return ret;
1941 }
1942 #endif /* HAVE_SET_RESTORE_SIGMASK */
1943
1944 #if (defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)) && !defined(CONFIG_NFSD_DEPRECATED)
1945 /* Stuff for NFS server syscalls... */
1946 struct compat_nfsctl_svc {
1947 u16 svc32_port;
1948 s32 svc32_nthreads;
1949 };
1950
1951 struct compat_nfsctl_client {
1952 s8 cl32_ident[NFSCLNT_IDMAX+1];
1953 s32 cl32_naddr;
1954 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1955 s32 cl32_fhkeytype;
1956 s32 cl32_fhkeylen;
1957 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1958 };
1959
1960 struct compat_nfsctl_export {
1961 char ex32_client[NFSCLNT_IDMAX+1];
1962 char ex32_path[NFS_MAXPATHLEN+1];
1963 compat_dev_t ex32_dev;
1964 compat_ino_t ex32_ino;
1965 compat_int_t ex32_flags;
1966 __compat_uid_t ex32_anon_uid;
1967 __compat_gid_t ex32_anon_gid;
1968 };
1969
1970 struct compat_nfsctl_fdparm {
1971 struct sockaddr gd32_addr;
1972 s8 gd32_path[NFS_MAXPATHLEN+1];
1973 compat_int_t gd32_version;
1974 };
1975
1976 struct compat_nfsctl_fsparm {
1977 struct sockaddr gd32_addr;
1978 s8 gd32_path[NFS_MAXPATHLEN+1];
1979 compat_int_t gd32_maxlen;
1980 };
1981
1982 struct compat_nfsctl_arg {
1983 compat_int_t ca32_version; /* safeguard */
1984 union {
1985 struct compat_nfsctl_svc u32_svc;
1986 struct compat_nfsctl_client u32_client;
1987 struct compat_nfsctl_export u32_export;
1988 struct compat_nfsctl_fdparm u32_getfd;
1989 struct compat_nfsctl_fsparm u32_getfs;
1990 } u;
1991 #define ca32_svc u.u32_svc
1992 #define ca32_client u.u32_client
1993 #define ca32_export u.u32_export
1994 #define ca32_getfd u.u32_getfd
1995 #define ca32_getfs u.u32_getfs
1996 };
1997
1998 union compat_nfsctl_res {
1999 __u8 cr32_getfh[NFS_FHSIZE];
2000 struct knfsd_fh cr32_getfs;
2001 };
2002
2003 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2004 struct compat_nfsctl_arg __user *arg)
2005 {
2006 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2007 get_user(karg->ca_version, &arg->ca32_version) ||
2008 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2009 __get_user(karg->ca_svc.svc_nthreads,
2010 &arg->ca32_svc.svc32_nthreads))
2011 return -EFAULT;
2012 return 0;
2013 }
2014
2015 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2016 struct compat_nfsctl_arg __user *arg)
2017 {
2018 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2019 sizeof(arg->ca32_client)) ||
2020 get_user(karg->ca_version, &arg->ca32_version) ||
2021 __copy_from_user(&karg->ca_client.cl_ident[0],
2022 &arg->ca32_client.cl32_ident[0],
2023 NFSCLNT_IDMAX) ||
2024 __get_user(karg->ca_client.cl_naddr,
2025 &arg->ca32_client.cl32_naddr) ||
2026 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2027 &arg->ca32_client.cl32_addrlist[0],
2028 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2029 __get_user(karg->ca_client.cl_fhkeytype,
2030 &arg->ca32_client.cl32_fhkeytype) ||
2031 __get_user(karg->ca_client.cl_fhkeylen,
2032 &arg->ca32_client.cl32_fhkeylen) ||
2033 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2034 &arg->ca32_client.cl32_fhkey[0],
2035 NFSCLNT_KEYMAX))
2036 return -EFAULT;
2037
2038 return 0;
2039 }
2040
2041 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2042 struct compat_nfsctl_arg __user *arg)
2043 {
2044 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2045 sizeof(arg->ca32_export)) ||
2046 get_user(karg->ca_version, &arg->ca32_version) ||
2047 __copy_from_user(&karg->ca_export.ex_client[0],
2048 &arg->ca32_export.ex32_client[0],
2049 NFSCLNT_IDMAX) ||
2050 __copy_from_user(&karg->ca_export.ex_path[0],
2051 &arg->ca32_export.ex32_path[0],
2052 NFS_MAXPATHLEN) ||
2053 __get_user(karg->ca_export.ex_dev,
2054 &arg->ca32_export.ex32_dev) ||
2055 __get_user(karg->ca_export.ex_ino,
2056 &arg->ca32_export.ex32_ino) ||
2057 __get_user(karg->ca_export.ex_flags,
2058 &arg->ca32_export.ex32_flags) ||
2059 __get_user(karg->ca_export.ex_anon_uid,
2060 &arg->ca32_export.ex32_anon_uid) ||
2061 __get_user(karg->ca_export.ex_anon_gid,
2062 &arg->ca32_export.ex32_anon_gid))
2063 return -EFAULT;
2064 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2065 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2066
2067 return 0;
2068 }
2069
2070 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2071 struct compat_nfsctl_arg __user *arg)
2072 {
2073 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2074 sizeof(arg->ca32_getfd)) ||
2075 get_user(karg->ca_version, &arg->ca32_version) ||
2076 __copy_from_user(&karg->ca_getfd.gd_addr,
2077 &arg->ca32_getfd.gd32_addr,
2078 (sizeof(struct sockaddr))) ||
2079 __copy_from_user(&karg->ca_getfd.gd_path,
2080 &arg->ca32_getfd.gd32_path,
2081 (NFS_MAXPATHLEN+1)) ||
2082 __get_user(karg->ca_getfd.gd_version,
2083 &arg->ca32_getfd.gd32_version))
2084 return -EFAULT;
2085
2086 return 0;
2087 }
2088
2089 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2090 struct compat_nfsctl_arg __user *arg)
2091 {
2092 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2093 get_user(karg->ca_version, &arg->ca32_version) ||
2094 __copy_from_user(&karg->ca_getfs.gd_addr,
2095 &arg->ca32_getfs.gd32_addr,
2096 (sizeof(struct sockaddr))) ||
2097 __copy_from_user(&karg->ca_getfs.gd_path,
2098 &arg->ca32_getfs.gd32_path,
2099 (NFS_MAXPATHLEN+1)) ||
2100 __get_user(karg->ca_getfs.gd_maxlen,
2101 &arg->ca32_getfs.gd32_maxlen))
2102 return -EFAULT;
2103
2104 return 0;
2105 }
2106
2107 /* This really doesn't need translations, we are only passing
2108 * back a union which contains opaque nfs file handle data.
2109 */
2110 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2111 union compat_nfsctl_res __user *res)
2112 {
2113 int err;
2114
2115 err = copy_to_user(res, kres, sizeof(*res));
2116
2117 return (err) ? -EFAULT : 0;
2118 }
2119
2120 asmlinkage long compat_sys_nfsservctl(int cmd,
2121 struct compat_nfsctl_arg __user *arg,
2122 union compat_nfsctl_res __user *res)
2123 {
2124 struct nfsctl_arg *karg;
2125 union nfsctl_res *kres;
2126 mm_segment_t oldfs;
2127 int err;
2128
2129 karg = kmalloc(sizeof(*karg), GFP_USER);
2130 kres = kmalloc(sizeof(*kres), GFP_USER);
2131 if(!karg || !kres) {
2132 err = -ENOMEM;
2133 goto done;
2134 }
2135
2136 switch(cmd) {
2137 case NFSCTL_SVC:
2138 err = compat_nfs_svc_trans(karg, arg);
2139 break;
2140
2141 case NFSCTL_ADDCLIENT:
2142 err = compat_nfs_clnt_trans(karg, arg);
2143 break;
2144
2145 case NFSCTL_DELCLIENT:
2146 err = compat_nfs_clnt_trans(karg, arg);
2147 break;
2148
2149 case NFSCTL_EXPORT:
2150 case NFSCTL_UNEXPORT:
2151 err = compat_nfs_exp_trans(karg, arg);
2152 break;
2153
2154 case NFSCTL_GETFD:
2155 err = compat_nfs_getfd_trans(karg, arg);
2156 break;
2157
2158 case NFSCTL_GETFS:
2159 err = compat_nfs_getfs_trans(karg, arg);
2160 break;
2161
2162 default:
2163 err = -EINVAL;
2164 break;
2165 }
2166
2167 if (err)
2168 goto done;
2169
2170 oldfs = get_fs();
2171 set_fs(KERNEL_DS);
2172 /* The __user pointer casts are valid because of the set_fs() */
2173 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2174 set_fs(oldfs);
2175
2176 if (err)
2177 goto done;
2178
2179 if((cmd == NFSCTL_GETFD) ||
2180 (cmd == NFSCTL_GETFS))
2181 err = compat_nfs_getfh_res_trans(kres, res);
2182
2183 done:
2184 kfree(karg);
2185 kfree(kres);
2186 return err;
2187 }
2188 #else /* !NFSD */
2189 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2190 {
2191 return sys_ni_syscall();
2192 }
2193 #endif
2194
2195 #ifdef CONFIG_EPOLL
2196
2197 #ifdef HAVE_SET_RESTORE_SIGMASK
2198 asmlinkage long compat_sys_epoll_pwait(int epfd,
2199 struct compat_epoll_event __user *events,
2200 int maxevents, int timeout,
2201 const compat_sigset_t __user *sigmask,
2202 compat_size_t sigsetsize)
2203 {
2204 long err;
2205 compat_sigset_t csigmask;
2206 sigset_t ksigmask, sigsaved;
2207
2208 /*
2209 * If the caller wants a certain signal mask to be set during the wait,
2210 * we apply it here.
2211 */
2212 if (sigmask) {
2213 if (sigsetsize != sizeof(compat_sigset_t))
2214 return -EINVAL;
2215 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2216 return -EFAULT;
2217 sigset_from_compat(&ksigmask, &csigmask);
2218 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2219 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2220 }
2221
2222 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2223
2224 /*
2225 * If we changed the signal mask, we need to restore the original one.
2226 * In case we've got a signal while waiting, we do not restore the
2227 * signal mask yet, and we allow do_signal() to deliver the signal on
2228 * the way back to userspace, before the signal mask is restored.
2229 */
2230 if (sigmask) {
2231 if (err == -EINTR) {
2232 memcpy(&current->saved_sigmask, &sigsaved,
2233 sizeof(sigsaved));
2234 set_restore_sigmask();
2235 } else
2236 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2237 }
2238
2239 return err;
2240 }
2241 #endif /* HAVE_SET_RESTORE_SIGMASK */
2242
2243 #endif /* CONFIG_EPOLL */
2244
2245 #ifdef CONFIG_SIGNALFD
2246
2247 asmlinkage long compat_sys_signalfd4(int ufd,
2248 const compat_sigset_t __user *sigmask,
2249 compat_size_t sigsetsize, int flags)
2250 {
2251 compat_sigset_t ss32;
2252 sigset_t tmp;
2253 sigset_t __user *ksigmask;
2254
2255 if (sigsetsize != sizeof(compat_sigset_t))
2256 return -EINVAL;
2257 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2258 return -EFAULT;
2259 sigset_from_compat(&tmp, &ss32);
2260 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2261 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2262 return -EFAULT;
2263
2264 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2265 }
2266
2267 asmlinkage long compat_sys_signalfd(int ufd,
2268 const compat_sigset_t __user *sigmask,
2269 compat_size_t sigsetsize)
2270 {
2271 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2272 }
2273 #endif /* CONFIG_SIGNALFD */
2274
2275 #ifdef CONFIG_TIMERFD
2276
2277 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2278 const struct compat_itimerspec __user *utmr,
2279 struct compat_itimerspec __user *otmr)
2280 {
2281 int error;
2282 struct itimerspec t;
2283 struct itimerspec __user *ut;
2284
2285 if (get_compat_itimerspec(&t, utmr))
2286 return -EFAULT;
2287 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2288 if (copy_to_user(&ut[0], &t, sizeof(t)))
2289 return -EFAULT;
2290 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2291 if (!error && otmr)
2292 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2293 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2294
2295 return error;
2296 }
2297
2298 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2299 struct compat_itimerspec __user *otmr)
2300 {
2301 int error;
2302 struct itimerspec t;
2303 struct itimerspec __user *ut;
2304
2305 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2306 error = sys_timerfd_gettime(ufd, ut);
2307 if (!error)
2308 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2309 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2310
2311 return error;
2312 }
2313
2314 #endif /* CONFIG_TIMERFD */
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