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