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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/dirent.h>
37#include <linux/fsnotify.h>
38#include <linux/highuid.h>
39#include <linux/personality.h>
40#include <linux/rwsem.h>
41#include <linux/tsacct_kern.h>
42#include <linux/security.h>
43#include <linux/highmem.h>
44#include <linux/signal.h>
45#include <linux/poll.h>
46#include <linux/mm.h>
47#include <linux/fs_struct.h>
48#include <linux/slab.h>
49#include <linux/pagemap.h>
50#include <linux/aio.h>
51
52#include <asm/uaccess.h>
53#include <asm/mmu_context.h>
54#include <asm/ioctls.h>
55#include "internal.h"
56
57int compat_log = 1;
58
59int compat_printk(const char *fmt, ...)
60{
61 va_list ap;
62 int ret;
63 if (!compat_log)
64 return 0;
65 va_start(ap, fmt);
66 ret = vprintk(fmt, ap);
67 va_end(ap);
68 return ret;
69}
70
71/*
72 * Not all architectures have sys_utime, so implement this in terms
73 * of sys_utimes.
74 */
75COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
76 struct compat_utimbuf __user *, t)
77{
78 struct timespec tv[2];
79
80 if (t) {
81 if (get_user(tv[0].tv_sec, &t->actime) ||
82 get_user(tv[1].tv_sec, &t->modtime))
83 return -EFAULT;
84 tv[0].tv_nsec = 0;
85 tv[1].tv_nsec = 0;
86 }
87 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
88}
89
90COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags)
91{
92 struct timespec tv[2];
93
94 if (t) {
95 if (compat_get_timespec(&tv[0], &t[0]) ||
96 compat_get_timespec(&tv[1], &t[1]))
97 return -EFAULT;
98
99 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
100 return 0;
101 }
102 return do_utimes(dfd, filename, t ? tv : NULL, flags);
103}
104
105COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t)
106{
107 struct timespec tv[2];
108
109 if (t) {
110 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
111 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
112 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
113 get_user(tv[1].tv_nsec, &t[1].tv_usec))
114 return -EFAULT;
115 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
116 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
117 return -EINVAL;
118 tv[0].tv_nsec *= 1000;
119 tv[1].tv_nsec *= 1000;
120 }
121 return do_utimes(dfd, filename, t ? tv : NULL, 0);
122}
123
124COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
125{
126 return compat_sys_futimesat(AT_FDCWD, filename, t);
127}
128
129static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
130{
131 struct compat_stat tmp;
132
133 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
134 return -EOVERFLOW;
135
136 memset(&tmp, 0, sizeof(tmp));
137 tmp.st_dev = old_encode_dev(stat->dev);
138 tmp.st_ino = stat->ino;
139 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
140 return -EOVERFLOW;
141 tmp.st_mode = stat->mode;
142 tmp.st_nlink = stat->nlink;
143 if (tmp.st_nlink != stat->nlink)
144 return -EOVERFLOW;
145 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
146 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
147 tmp.st_rdev = old_encode_dev(stat->rdev);
148 if ((u64) stat->size > MAX_NON_LFS)
149 return -EOVERFLOW;
150 tmp.st_size = stat->size;
151 tmp.st_atime = stat->atime.tv_sec;
152 tmp.st_atime_nsec = stat->atime.tv_nsec;
153 tmp.st_mtime = stat->mtime.tv_sec;
154 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
155 tmp.st_ctime = stat->ctime.tv_sec;
156 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
157 tmp.st_blocks = stat->blocks;
158 tmp.st_blksize = stat->blksize;
159 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
160}
161
162COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
163 struct compat_stat __user *, statbuf)
164{
165 struct kstat stat;
166 int error;
167
168 error = vfs_stat(filename, &stat);
169 if (error)
170 return error;
171 return cp_compat_stat(&stat, statbuf);
172}
173
174COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
175 struct compat_stat __user *, statbuf)
176{
177 struct kstat stat;
178 int error;
179
180 error = vfs_lstat(filename, &stat);
181 if (error)
182 return error;
183 return cp_compat_stat(&stat, statbuf);
184}
185
186#ifndef __ARCH_WANT_STAT64
187COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
188 const char __user *, filename,
189 struct compat_stat __user *, statbuf, int, flag)
190{
191 struct kstat stat;
192 int error;
193
194 error = vfs_fstatat(dfd, filename, &stat, flag);
195 if (error)
196 return error;
197 return cp_compat_stat(&stat, statbuf);
198}
199#endif
200
201COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
202 struct compat_stat __user *, statbuf)
203{
204 struct kstat stat;
205 int error = vfs_fstat(fd, &stat);
206
207 if (!error)
208 error = cp_compat_stat(&stat, statbuf);
209 return error;
210}
211
212static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
213{
214
215 if (sizeof ubuf->f_blocks == 4) {
216 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
217 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
218 return -EOVERFLOW;
219 /* f_files and f_ffree may be -1; it's okay
220 * to stuff that into 32 bits */
221 if (kbuf->f_files != 0xffffffffffffffffULL
222 && (kbuf->f_files & 0xffffffff00000000ULL))
223 return -EOVERFLOW;
224 if (kbuf->f_ffree != 0xffffffffffffffffULL
225 && (kbuf->f_ffree & 0xffffffff00000000ULL))
226 return -EOVERFLOW;
227 }
228 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
229 __put_user(kbuf->f_type, &ubuf->f_type) ||
230 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
231 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
232 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
233 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
234 __put_user(kbuf->f_files, &ubuf->f_files) ||
235 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
236 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
237 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
238 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
239 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
240 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
241 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
242 return -EFAULT;
243 return 0;
244}
245
246/*
247 * The following statfs calls are copies of code from fs/statfs.c and
248 * should be checked against those from time to time
249 */
250COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
251{
252 struct kstatfs tmp;
253 int error = user_statfs(pathname, &tmp);
254 if (!error)
255 error = put_compat_statfs(buf, &tmp);
256 return error;
257}
258
259COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
260{
261 struct kstatfs tmp;
262 int error = fd_statfs(fd, &tmp);
263 if (!error)
264 error = put_compat_statfs(buf, &tmp);
265 return error;
266}
267
268static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
269{
270 if (sizeof ubuf->f_blocks == 4) {
271 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
272 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
273 return -EOVERFLOW;
274 /* f_files and f_ffree may be -1; it's okay
275 * to stuff that into 32 bits */
276 if (kbuf->f_files != 0xffffffffffffffffULL
277 && (kbuf->f_files & 0xffffffff00000000ULL))
278 return -EOVERFLOW;
279 if (kbuf->f_ffree != 0xffffffffffffffffULL
280 && (kbuf->f_ffree & 0xffffffff00000000ULL))
281 return -EOVERFLOW;
282 }
283 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
284 __put_user(kbuf->f_type, &ubuf->f_type) ||
285 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
286 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
287 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
288 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
289 __put_user(kbuf->f_files, &ubuf->f_files) ||
290 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
291 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
292 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
293 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
294 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
295 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
296 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
297 return -EFAULT;
298 return 0;
299}
300
301COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
302{
303 struct kstatfs tmp;
304 int error;
305
306 if (sz != sizeof(*buf))
307 return -EINVAL;
308
309 error = user_statfs(pathname, &tmp);
310 if (!error)
311 error = put_compat_statfs64(buf, &tmp);
312 return error;
313}
314
315COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
316{
317 struct kstatfs tmp;
318 int error;
319
320 if (sz != sizeof(*buf))
321 return -EINVAL;
322
323 error = fd_statfs(fd, &tmp);
324 if (!error)
325 error = put_compat_statfs64(buf, &tmp);
326 return error;
327}
328
329/*
330 * This is a copy of sys_ustat, just dealing with a structure layout.
331 * Given how simple this syscall is that apporach is more maintainable
332 * than the various conversion hacks.
333 */
334COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
335{
336 struct compat_ustat tmp;
337 struct kstatfs sbuf;
338 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
339 if (err)
340 return err;
341
342 memset(&tmp, 0, sizeof(struct compat_ustat));
343 tmp.f_tfree = sbuf.f_bfree;
344 tmp.f_tinode = sbuf.f_ffree;
345 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
346 return -EFAULT;
347 return 0;
348}
349
350static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
351{
352 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
353 __get_user(kfl->l_type, &ufl->l_type) ||
354 __get_user(kfl->l_whence, &ufl->l_whence) ||
355 __get_user(kfl->l_start, &ufl->l_start) ||
356 __get_user(kfl->l_len, &ufl->l_len) ||
357 __get_user(kfl->l_pid, &ufl->l_pid))
358 return -EFAULT;
359 return 0;
360}
361
362static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
363{
364 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
365 __put_user(kfl->l_type, &ufl->l_type) ||
366 __put_user(kfl->l_whence, &ufl->l_whence) ||
367 __put_user(kfl->l_start, &ufl->l_start) ||
368 __put_user(kfl->l_len, &ufl->l_len) ||
369 __put_user(kfl->l_pid, &ufl->l_pid))
370 return -EFAULT;
371 return 0;
372}
373
374#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
375static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
376{
377 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
378 __get_user(kfl->l_type, &ufl->l_type) ||
379 __get_user(kfl->l_whence, &ufl->l_whence) ||
380 __get_user(kfl->l_start, &ufl->l_start) ||
381 __get_user(kfl->l_len, &ufl->l_len) ||
382 __get_user(kfl->l_pid, &ufl->l_pid))
383 return -EFAULT;
384 return 0;
385}
386#endif
387
388#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
389static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
390{
391 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
392 __put_user(kfl->l_type, &ufl->l_type) ||
393 __put_user(kfl->l_whence, &ufl->l_whence) ||
394 __put_user(kfl->l_start, &ufl->l_start) ||
395 __put_user(kfl->l_len, &ufl->l_len) ||
396 __put_user(kfl->l_pid, &ufl->l_pid))
397 return -EFAULT;
398 return 0;
399}
400#endif
401
402static unsigned int
403convert_fcntl_cmd(unsigned int cmd)
404{
405 switch (cmd) {
406 case F_GETLK64:
407 return F_GETLK;
408 case F_SETLK64:
409 return F_SETLK;
410 case F_SETLKW64:
411 return F_SETLKW;
412 }
413
414 return cmd;
415}
416
417COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
418 compat_ulong_t, arg)
419{
420 mm_segment_t old_fs;
421 struct flock f;
422 long ret;
423 unsigned int conv_cmd;
424
425 switch (cmd) {
426 case F_GETLK:
427 case F_SETLK:
428 case F_SETLKW:
429 ret = get_compat_flock(&f, compat_ptr(arg));
430 if (ret != 0)
431 break;
432 old_fs = get_fs();
433 set_fs(KERNEL_DS);
434 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
435 set_fs(old_fs);
436 if (cmd == F_GETLK && ret == 0) {
437 /* GETLK was successful and we need to return the data...
438 * but it needs to fit in the compat structure.
439 * l_start shouldn't be too big, unless the original
440 * start + end is greater than COMPAT_OFF_T_MAX, in which
441 * case the app was asking for trouble, so we return
442 * -EOVERFLOW in that case.
443 * l_len could be too big, in which case we just truncate it,
444 * and only allow the app to see that part of the conflicting
445 * lock that might make sense to it anyway
446 */
447
448 if (f.l_start > COMPAT_OFF_T_MAX)
449 ret = -EOVERFLOW;
450 if (f.l_len > COMPAT_OFF_T_MAX)
451 f.l_len = COMPAT_OFF_T_MAX;
452 if (ret == 0)
453 ret = put_compat_flock(&f, compat_ptr(arg));
454 }
455 break;
456
457 case F_GETLK64:
458 case F_SETLK64:
459 case F_SETLKW64:
460 case F_OFD_GETLK:
461 case F_OFD_SETLK:
462 case F_OFD_SETLKW:
463 ret = get_compat_flock64(&f, compat_ptr(arg));
464 if (ret != 0)
465 break;
466 old_fs = get_fs();
467 set_fs(KERNEL_DS);
468 conv_cmd = convert_fcntl_cmd(cmd);
469 ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
470 set_fs(old_fs);
471 if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) {
472 /* need to return lock information - see above for commentary */
473 if (f.l_start > COMPAT_LOFF_T_MAX)
474 ret = -EOVERFLOW;
475 if (f.l_len > COMPAT_LOFF_T_MAX)
476 f.l_len = COMPAT_LOFF_T_MAX;
477 if (ret == 0)
478 ret = put_compat_flock64(&f, compat_ptr(arg));
479 }
480 break;
481
482 default:
483 ret = sys_fcntl(fd, cmd, arg);
484 break;
485 }
486 return ret;
487}
488
489COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
490 compat_ulong_t, arg)
491{
492 switch (cmd) {
493 case F_GETLK64:
494 case F_SETLK64:
495 case F_SETLKW64:
496 case F_OFD_GETLK:
497 case F_OFD_SETLK:
498 case F_OFD_SETLKW:
499 return -EINVAL;
500 }
501 return compat_sys_fcntl64(fd, cmd, arg);
502}
503
504COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_reqs, u32 __user *, ctx32p)
505{
506 long ret;
507 aio_context_t ctx64;
508
509 mm_segment_t oldfs = get_fs();
510 if (unlikely(get_user(ctx64, ctx32p)))
511 return -EFAULT;
512
513 set_fs(KERNEL_DS);
514 /* The __user pointer cast is valid because of the set_fs() */
515 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
516 set_fs(oldfs);
517 /* truncating is ok because it's a user address */
518 if (!ret)
519 ret = put_user((u32) ctx64, ctx32p);
520 return ret;
521}
522
523COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id,
524 compat_long_t, min_nr,
525 compat_long_t, nr,
526 struct io_event __user *, events,
527 struct compat_timespec __user *, timeout)
528{
529 struct timespec t;
530 struct timespec __user *ut = NULL;
531
532 if (timeout) {
533 if (compat_get_timespec(&t, timeout))
534 return -EFAULT;
535
536 ut = compat_alloc_user_space(sizeof(*ut));
537 if (copy_to_user(ut, &t, sizeof(t)) )
538 return -EFAULT;
539 }
540 return sys_io_getevents(ctx_id, min_nr, nr, events, ut);
541}
542
543/* A write operation does a read from user space and vice versa */
544#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
545
546ssize_t compat_rw_copy_check_uvector(int type,
547 const struct compat_iovec __user *uvector, unsigned long nr_segs,
548 unsigned long fast_segs, struct iovec *fast_pointer,
549 struct iovec **ret_pointer)
550{
551 compat_ssize_t tot_len;
552 struct iovec *iov = *ret_pointer = fast_pointer;
553 ssize_t ret = 0;
554 int seg;
555
556 /*
557 * SuS says "The readv() function *may* fail if the iovcnt argument
558 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
559 * traditionally returned zero for zero segments, so...
560 */
561 if (nr_segs == 0)
562 goto out;
563
564 ret = -EINVAL;
565 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
566 goto out;
567 if (nr_segs > fast_segs) {
568 ret = -ENOMEM;
569 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
570 if (iov == NULL)
571 goto out;
572 }
573 *ret_pointer = iov;
574
575 ret = -EFAULT;
576 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
577 goto out;
578
579 /*
580 * Single unix specification:
581 * We should -EINVAL if an element length is not >= 0 and fitting an
582 * ssize_t.
583 *
584 * In Linux, the total length is limited to MAX_RW_COUNT, there is
585 * no overflow possibility.
586 */
587 tot_len = 0;
588 ret = -EINVAL;
589 for (seg = 0; seg < nr_segs; seg++) {
590 compat_uptr_t buf;
591 compat_ssize_t len;
592
593 if (__get_user(len, &uvector->iov_len) ||
594 __get_user(buf, &uvector->iov_base)) {
595 ret = -EFAULT;
596 goto out;
597 }
598 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
599 goto out;
600 if (type >= 0 &&
601 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
602 ret = -EFAULT;
603 goto out;
604 }
605 if (len > MAX_RW_COUNT - tot_len)
606 len = MAX_RW_COUNT - tot_len;
607 tot_len += len;
608 iov->iov_base = compat_ptr(buf);
609 iov->iov_len = (compat_size_t) len;
610 uvector++;
611 iov++;
612 }
613 ret = tot_len;
614
615out:
616 return ret;
617}
618
619static inline long
620copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
621{
622 compat_uptr_t uptr;
623 int i;
624
625 for (i = 0; i < nr; ++i) {
626 if (get_user(uptr, ptr32 + i))
627 return -EFAULT;
628 if (put_user(compat_ptr(uptr), ptr64 + i))
629 return -EFAULT;
630 }
631 return 0;
632}
633
634#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
635
636COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
637 int, nr, u32 __user *, iocb)
638{
639 struct iocb __user * __user *iocb64;
640 long ret;
641
642 if (unlikely(nr < 0))
643 return -EINVAL;
644
645 if (nr > MAX_AIO_SUBMITS)
646 nr = MAX_AIO_SUBMITS;
647
648 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
649 ret = copy_iocb(nr, iocb, iocb64);
650 if (!ret)
651 ret = do_io_submit(ctx_id, nr, iocb64, 1);
652 return ret;
653}
654
655struct compat_ncp_mount_data {
656 compat_int_t version;
657 compat_uint_t ncp_fd;
658 __compat_uid_t mounted_uid;
659 compat_pid_t wdog_pid;
660 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
661 compat_uint_t time_out;
662 compat_uint_t retry_count;
663 compat_uint_t flags;
664 __compat_uid_t uid;
665 __compat_gid_t gid;
666 compat_mode_t file_mode;
667 compat_mode_t dir_mode;
668};
669
670struct compat_ncp_mount_data_v4 {
671 compat_int_t version;
672 compat_ulong_t flags;
673 compat_ulong_t mounted_uid;
674 compat_long_t wdog_pid;
675 compat_uint_t ncp_fd;
676 compat_uint_t time_out;
677 compat_uint_t retry_count;
678 compat_ulong_t uid;
679 compat_ulong_t gid;
680 compat_ulong_t file_mode;
681 compat_ulong_t dir_mode;
682};
683
684static void *do_ncp_super_data_conv(void *raw_data)
685{
686 int version = *(unsigned int *)raw_data;
687
688 if (version == 3) {
689 struct compat_ncp_mount_data *c_n = raw_data;
690 struct ncp_mount_data *n = raw_data;
691
692 n->dir_mode = c_n->dir_mode;
693 n->file_mode = c_n->file_mode;
694 n->gid = c_n->gid;
695 n->uid = c_n->uid;
696 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
697 n->wdog_pid = c_n->wdog_pid;
698 n->mounted_uid = c_n->mounted_uid;
699 } else if (version == 4) {
700 struct compat_ncp_mount_data_v4 *c_n = raw_data;
701 struct ncp_mount_data_v4 *n = raw_data;
702
703 n->dir_mode = c_n->dir_mode;
704 n->file_mode = c_n->file_mode;
705 n->gid = c_n->gid;
706 n->uid = c_n->uid;
707 n->retry_count = c_n->retry_count;
708 n->time_out = c_n->time_out;
709 n->ncp_fd = c_n->ncp_fd;
710 n->wdog_pid = c_n->wdog_pid;
711 n->mounted_uid = c_n->mounted_uid;
712 n->flags = c_n->flags;
713 } else if (version != 5) {
714 return NULL;
715 }
716
717 return raw_data;
718}
719
720
721struct compat_nfs_string {
722 compat_uint_t len;
723 compat_uptr_t data;
724};
725
726static inline void compat_nfs_string(struct nfs_string *dst,
727 struct compat_nfs_string *src)
728{
729 dst->data = compat_ptr(src->data);
730 dst->len = src->len;
731}
732
733struct compat_nfs4_mount_data_v1 {
734 compat_int_t version;
735 compat_int_t flags;
736 compat_int_t rsize;
737 compat_int_t wsize;
738 compat_int_t timeo;
739 compat_int_t retrans;
740 compat_int_t acregmin;
741 compat_int_t acregmax;
742 compat_int_t acdirmin;
743 compat_int_t acdirmax;
744 struct compat_nfs_string client_addr;
745 struct compat_nfs_string mnt_path;
746 struct compat_nfs_string hostname;
747 compat_uint_t host_addrlen;
748 compat_uptr_t host_addr;
749 compat_int_t proto;
750 compat_int_t auth_flavourlen;
751 compat_uptr_t auth_flavours;
752};
753
754static int do_nfs4_super_data_conv(void *raw_data)
755{
756 int version = *(compat_uint_t *) raw_data;
757
758 if (version == 1) {
759 struct compat_nfs4_mount_data_v1 *raw = raw_data;
760 struct nfs4_mount_data *real = raw_data;
761
762 /* copy the fields backwards */
763 real->auth_flavours = compat_ptr(raw->auth_flavours);
764 real->auth_flavourlen = raw->auth_flavourlen;
765 real->proto = raw->proto;
766 real->host_addr = compat_ptr(raw->host_addr);
767 real->host_addrlen = raw->host_addrlen;
768 compat_nfs_string(&real->hostname, &raw->hostname);
769 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
770 compat_nfs_string(&real->client_addr, &raw->client_addr);
771 real->acdirmax = raw->acdirmax;
772 real->acdirmin = raw->acdirmin;
773 real->acregmax = raw->acregmax;
774 real->acregmin = raw->acregmin;
775 real->retrans = raw->retrans;
776 real->timeo = raw->timeo;
777 real->wsize = raw->wsize;
778 real->rsize = raw->rsize;
779 real->flags = raw->flags;
780 real->version = raw->version;
781 }
782
783 return 0;
784}
785
786#define NCPFS_NAME "ncpfs"
787#define NFS4_NAME "nfs4"
788
789COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
790 const char __user *, dir_name,
791 const char __user *, type, compat_ulong_t, flags,
792 const void __user *, data)
793{
794 char *kernel_type;
795 void *options;
796 char *kernel_dev;
797 int retval;
798
799 kernel_type = copy_mount_string(type);
800 retval = PTR_ERR(kernel_type);
801 if (IS_ERR(kernel_type))
802 goto out;
803
804 kernel_dev = copy_mount_string(dev_name);
805 retval = PTR_ERR(kernel_dev);
806 if (IS_ERR(kernel_dev))
807 goto out1;
808
809 options = copy_mount_options(data);
810 retval = PTR_ERR(options);
811 if (IS_ERR(options))
812 goto out2;
813
814 if (kernel_type && options) {
815 if (!strcmp(kernel_type, NCPFS_NAME)) {
816 do_ncp_super_data_conv(options);
817 } else if (!strcmp(kernel_type, NFS4_NAME)) {
818 retval = -EINVAL;
819 if (do_nfs4_super_data_conv(options))
820 goto out3;
821 }
822 }
823
824 retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
825
826 out3:
827 kfree(options);
828 out2:
829 kfree(kernel_dev);
830 out1:
831 kfree(kernel_type);
832 out:
833 return retval;
834}
835
836struct compat_old_linux_dirent {
837 compat_ulong_t d_ino;
838 compat_ulong_t d_offset;
839 unsigned short d_namlen;
840 char d_name[1];
841};
842
843struct compat_readdir_callback {
844 struct dir_context ctx;
845 struct compat_old_linux_dirent __user *dirent;
846 int result;
847};
848
849static int compat_fillonedir(struct dir_context *ctx, const char *name,
850 int namlen, loff_t offset, u64 ino,
851 unsigned int d_type)
852{
853 struct compat_readdir_callback *buf =
854 container_of(ctx, struct compat_readdir_callback, ctx);
855 struct compat_old_linux_dirent __user *dirent;
856 compat_ulong_t d_ino;
857
858 if (buf->result)
859 return -EINVAL;
860 d_ino = ino;
861 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
862 buf->result = -EOVERFLOW;
863 return -EOVERFLOW;
864 }
865 buf->result++;
866 dirent = buf->dirent;
867 if (!access_ok(VERIFY_WRITE, dirent,
868 (unsigned long)(dirent->d_name + namlen + 1) -
869 (unsigned long)dirent))
870 goto efault;
871 if ( __put_user(d_ino, &dirent->d_ino) ||
872 __put_user(offset, &dirent->d_offset) ||
873 __put_user(namlen, &dirent->d_namlen) ||
874 __copy_to_user(dirent->d_name, name, namlen) ||
875 __put_user(0, dirent->d_name + namlen))
876 goto efault;
877 return 0;
878efault:
879 buf->result = -EFAULT;
880 return -EFAULT;
881}
882
883COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
884 struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
885{
886 int error;
887 struct fd f = fdget(fd);
888 struct compat_readdir_callback buf = {
889 .ctx.actor = compat_fillonedir,
890 .dirent = dirent
891 };
892
893 if (!f.file)
894 return -EBADF;
895
896 error = iterate_dir(f.file, &buf.ctx);
897 if (buf.result)
898 error = buf.result;
899
900 fdput(f);
901 return error;
902}
903
904struct compat_linux_dirent {
905 compat_ulong_t d_ino;
906 compat_ulong_t d_off;
907 unsigned short d_reclen;
908 char d_name[1];
909};
910
911struct compat_getdents_callback {
912 struct dir_context ctx;
913 struct compat_linux_dirent __user *current_dir;
914 struct compat_linux_dirent __user *previous;
915 int count;
916 int error;
917};
918
919static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
920 loff_t offset, u64 ino, unsigned int d_type)
921{
922 struct compat_linux_dirent __user * dirent;
923 struct compat_getdents_callback *buf =
924 container_of(ctx, struct compat_getdents_callback, ctx);
925 compat_ulong_t d_ino;
926 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
927 namlen + 2, sizeof(compat_long_t));
928
929 buf->error = -EINVAL; /* only used if we fail.. */
930 if (reclen > buf->count)
931 return -EINVAL;
932 d_ino = ino;
933 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
934 buf->error = -EOVERFLOW;
935 return -EOVERFLOW;
936 }
937 dirent = buf->previous;
938 if (dirent) {
939 if (__put_user(offset, &dirent->d_off))
940 goto efault;
941 }
942 dirent = buf->current_dir;
943 if (__put_user(d_ino, &dirent->d_ino))
944 goto efault;
945 if (__put_user(reclen, &dirent->d_reclen))
946 goto efault;
947 if (copy_to_user(dirent->d_name, name, namlen))
948 goto efault;
949 if (__put_user(0, dirent->d_name + namlen))
950 goto efault;
951 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
952 goto efault;
953 buf->previous = dirent;
954 dirent = (void __user *)dirent + reclen;
955 buf->current_dir = dirent;
956 buf->count -= reclen;
957 return 0;
958efault:
959 buf->error = -EFAULT;
960 return -EFAULT;
961}
962
963COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
964 struct compat_linux_dirent __user *, dirent, unsigned int, count)
965{
966 struct fd f;
967 struct compat_linux_dirent __user * lastdirent;
968 struct compat_getdents_callback buf = {
969 .ctx.actor = compat_filldir,
970 .current_dir = dirent,
971 .count = count
972 };
973 int error;
974
975 if (!access_ok(VERIFY_WRITE, dirent, count))
976 return -EFAULT;
977
978 f = fdget(fd);
979 if (!f.file)
980 return -EBADF;
981
982 error = iterate_dir(f.file, &buf.ctx);
983 if (error >= 0)
984 error = buf.error;
985 lastdirent = buf.previous;
986 if (lastdirent) {
987 if (put_user(buf.ctx.pos, &lastdirent->d_off))
988 error = -EFAULT;
989 else
990 error = count - buf.count;
991 }
992 fdput(f);
993 return error;
994}
995
996#ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
997
998struct compat_getdents_callback64 {
999 struct dir_context ctx;
1000 struct linux_dirent64 __user *current_dir;
1001 struct linux_dirent64 __user *previous;
1002 int count;
1003 int error;
1004};
1005
1006static int compat_filldir64(struct dir_context *ctx, const char *name,
1007 int namlen, loff_t offset, u64 ino,
1008 unsigned int d_type)
1009{
1010 struct linux_dirent64 __user *dirent;
1011 struct compat_getdents_callback64 *buf =
1012 container_of(ctx, struct compat_getdents_callback64, ctx);
1013 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1014 sizeof(u64));
1015 u64 off;
1016
1017 buf->error = -EINVAL; /* only used if we fail.. */
1018 if (reclen > buf->count)
1019 return -EINVAL;
1020 dirent = buf->previous;
1021
1022 if (dirent) {
1023 if (__put_user_unaligned(offset, &dirent->d_off))
1024 goto efault;
1025 }
1026 dirent = buf->current_dir;
1027 if (__put_user_unaligned(ino, &dirent->d_ino))
1028 goto efault;
1029 off = 0;
1030 if (__put_user_unaligned(off, &dirent->d_off))
1031 goto efault;
1032 if (__put_user(reclen, &dirent->d_reclen))
1033 goto efault;
1034 if (__put_user(d_type, &dirent->d_type))
1035 goto efault;
1036 if (copy_to_user(dirent->d_name, name, namlen))
1037 goto efault;
1038 if (__put_user(0, dirent->d_name + namlen))
1039 goto efault;
1040 buf->previous = dirent;
1041 dirent = (void __user *)dirent + reclen;
1042 buf->current_dir = dirent;
1043 buf->count -= reclen;
1044 return 0;
1045efault:
1046 buf->error = -EFAULT;
1047 return -EFAULT;
1048}
1049
1050COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
1051 struct linux_dirent64 __user *, dirent, unsigned int, count)
1052{
1053 struct fd f;
1054 struct linux_dirent64 __user * lastdirent;
1055 struct compat_getdents_callback64 buf = {
1056 .ctx.actor = compat_filldir64,
1057 .current_dir = dirent,
1058 .count = count
1059 };
1060 int error;
1061
1062 if (!access_ok(VERIFY_WRITE, dirent, count))
1063 return -EFAULT;
1064
1065 f = fdget(fd);
1066 if (!f.file)
1067 return -EBADF;
1068
1069 error = iterate_dir(f.file, &buf.ctx);
1070 if (error >= 0)
1071 error = buf.error;
1072 lastdirent = buf.previous;
1073 if (lastdirent) {
1074 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
1075 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1076 error = -EFAULT;
1077 else
1078 error = count - buf.count;
1079 }
1080 fdput(f);
1081 return error;
1082}
1083#endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
1084
1085/*
1086 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1087 * O_LARGEFILE flag.
1088 */
1089COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1090{
1091 return do_sys_open(AT_FDCWD, filename, flags, mode);
1092}
1093
1094/*
1095 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1096 * O_LARGEFILE flag.
1097 */
1098COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1099{
1100 return do_sys_open(dfd, filename, flags, mode);
1101}
1102
1103#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1104
1105static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1106 int timeval, int ret)
1107{
1108 struct timespec ts;
1109
1110 if (!p)
1111 return ret;
1112
1113 if (current->personality & STICKY_TIMEOUTS)
1114 goto sticky;
1115
1116 /* No update for zero timeout */
1117 if (!end_time->tv_sec && !end_time->tv_nsec)
1118 return ret;
1119
1120 ktime_get_ts(&ts);
1121 ts = timespec_sub(*end_time, ts);
1122 if (ts.tv_sec < 0)
1123 ts.tv_sec = ts.tv_nsec = 0;
1124
1125 if (timeval) {
1126 struct compat_timeval rtv;
1127
1128 rtv.tv_sec = ts.tv_sec;
1129 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1130
1131 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1132 return ret;
1133 } else {
1134 struct compat_timespec rts;
1135
1136 rts.tv_sec = ts.tv_sec;
1137 rts.tv_nsec = ts.tv_nsec;
1138
1139 if (!copy_to_user(p, &rts, sizeof(rts)))
1140 return ret;
1141 }
1142 /*
1143 * If an application puts its timeval in read-only memory, we
1144 * don't want the Linux-specific update to the timeval to
1145 * cause a fault after the select has completed
1146 * successfully. However, because we're not updating the
1147 * timeval, we can't restart the system call.
1148 */
1149
1150sticky:
1151 if (ret == -ERESTARTNOHAND)
1152 ret = -EINTR;
1153 return ret;
1154}
1155
1156/*
1157 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1158 * 64-bit unsigned longs.
1159 */
1160static
1161int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1162 unsigned long *fdset)
1163{
1164 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1165 if (ufdset) {
1166 unsigned long odd;
1167
1168 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1169 return -EFAULT;
1170
1171 odd = nr & 1UL;
1172 nr &= ~1UL;
1173 while (nr) {
1174 unsigned long h, l;
1175 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1176 return -EFAULT;
1177 ufdset += 2;
1178 *fdset++ = h << 32 | l;
1179 nr -= 2;
1180 }
1181 if (odd && __get_user(*fdset, ufdset))
1182 return -EFAULT;
1183 } else {
1184 /* Tricky, must clear full unsigned long in the
1185 * kernel fdset at the end, this makes sure that
1186 * actually happens.
1187 */
1188 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1189 }
1190 return 0;
1191}
1192
1193static
1194int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1195 unsigned long *fdset)
1196{
1197 unsigned long odd;
1198 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1199
1200 if (!ufdset)
1201 return 0;
1202
1203 odd = nr & 1UL;
1204 nr &= ~1UL;
1205 while (nr) {
1206 unsigned long h, l;
1207 l = *fdset++;
1208 h = l >> 32;
1209 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1210 return -EFAULT;
1211 ufdset += 2;
1212 nr -= 2;
1213 }
1214 if (odd && __put_user(*fdset, ufdset))
1215 return -EFAULT;
1216 return 0;
1217}
1218
1219
1220/*
1221 * This is a virtual copy of sys_select from fs/select.c and probably
1222 * should be compared to it from time to time
1223 */
1224
1225/*
1226 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1227 * like to be certain this leads to no problems. So I return
1228 * EINTR just for safety.
1229 *
1230 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1231 * I'm trying ERESTARTNOHAND which restart only when you want to.
1232 */
1233int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1234 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1235 struct timespec *end_time)
1236{
1237 fd_set_bits fds;
1238 void *bits;
1239 int size, max_fds, ret = -EINVAL;
1240 struct fdtable *fdt;
1241 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1242
1243 if (n < 0)
1244 goto out_nofds;
1245
1246 /* max_fds can increase, so grab it once to avoid race */
1247 rcu_read_lock();
1248 fdt = files_fdtable(current->files);
1249 max_fds = fdt->max_fds;
1250 rcu_read_unlock();
1251 if (n > max_fds)
1252 n = max_fds;
1253
1254 /*
1255 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1256 * since we used fdset we need to allocate memory in units of
1257 * long-words.
1258 */
1259 size = FDS_BYTES(n);
1260 bits = stack_fds;
1261 if (size > sizeof(stack_fds) / 6) {
1262 bits = kmalloc(6 * size, GFP_KERNEL);
1263 ret = -ENOMEM;
1264 if (!bits)
1265 goto out_nofds;
1266 }
1267 fds.in = (unsigned long *) bits;
1268 fds.out = (unsigned long *) (bits + size);
1269 fds.ex = (unsigned long *) (bits + 2*size);
1270 fds.res_in = (unsigned long *) (bits + 3*size);
1271 fds.res_out = (unsigned long *) (bits + 4*size);
1272 fds.res_ex = (unsigned long *) (bits + 5*size);
1273
1274 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1275 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1276 (ret = compat_get_fd_set(n, exp, fds.ex)))
1277 goto out;
1278 zero_fd_set(n, fds.res_in);
1279 zero_fd_set(n, fds.res_out);
1280 zero_fd_set(n, fds.res_ex);
1281
1282 ret = do_select(n, &fds, end_time);
1283
1284 if (ret < 0)
1285 goto out;
1286 if (!ret) {
1287 ret = -ERESTARTNOHAND;
1288 if (signal_pending(current))
1289 goto out;
1290 ret = 0;
1291 }
1292
1293 if (compat_set_fd_set(n, inp, fds.res_in) ||
1294 compat_set_fd_set(n, outp, fds.res_out) ||
1295 compat_set_fd_set(n, exp, fds.res_ex))
1296 ret = -EFAULT;
1297out:
1298 if (bits != stack_fds)
1299 kfree(bits);
1300out_nofds:
1301 return ret;
1302}
1303
1304COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
1305 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1306 struct compat_timeval __user *, tvp)
1307{
1308 struct timespec end_time, *to = NULL;
1309 struct compat_timeval tv;
1310 int ret;
1311
1312 if (tvp) {
1313 if (copy_from_user(&tv, tvp, sizeof(tv)))
1314 return -EFAULT;
1315
1316 to = &end_time;
1317 if (poll_select_set_timeout(to,
1318 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1319 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1320 return -EINVAL;
1321 }
1322
1323 ret = compat_core_sys_select(n, inp, outp, exp, to);
1324 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1325
1326 return ret;
1327}
1328
1329struct compat_sel_arg_struct {
1330 compat_ulong_t n;
1331 compat_uptr_t inp;
1332 compat_uptr_t outp;
1333 compat_uptr_t exp;
1334 compat_uptr_t tvp;
1335};
1336
1337COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg)
1338{
1339 struct compat_sel_arg_struct a;
1340
1341 if (copy_from_user(&a, arg, sizeof(a)))
1342 return -EFAULT;
1343 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1344 compat_ptr(a.exp), compat_ptr(a.tvp));
1345}
1346
1347static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1348 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1349 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1350 compat_size_t sigsetsize)
1351{
1352 compat_sigset_t ss32;
1353 sigset_t ksigmask, sigsaved;
1354 struct compat_timespec ts;
1355 struct timespec end_time, *to = NULL;
1356 int ret;
1357
1358 if (tsp) {
1359 if (copy_from_user(&ts, tsp, sizeof(ts)))
1360 return -EFAULT;
1361
1362 to = &end_time;
1363 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1364 return -EINVAL;
1365 }
1366
1367 if (sigmask) {
1368 if (sigsetsize != sizeof(compat_sigset_t))
1369 return -EINVAL;
1370 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1371 return -EFAULT;
1372 sigset_from_compat(&ksigmask, &ss32);
1373
1374 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1375 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1376 }
1377
1378 ret = compat_core_sys_select(n, inp, outp, exp, to);
1379 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1380
1381 if (ret == -ERESTARTNOHAND) {
1382 /*
1383 * Don't restore the signal mask yet. Let do_signal() deliver
1384 * the signal on the way back to userspace, before the signal
1385 * mask is restored.
1386 */
1387 if (sigmask) {
1388 memcpy(¤t->saved_sigmask, &sigsaved,
1389 sizeof(sigsaved));
1390 set_restore_sigmask();
1391 }
1392 } else if (sigmask)
1393 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1394
1395 return ret;
1396}
1397
1398COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
1399 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1400 struct compat_timespec __user *, tsp, void __user *, sig)
1401{
1402 compat_size_t sigsetsize = 0;
1403 compat_uptr_t up = 0;
1404
1405 if (sig) {
1406 if (!access_ok(VERIFY_READ, sig,
1407 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1408 __get_user(up, (compat_uptr_t __user *)sig) ||
1409 __get_user(sigsetsize,
1410 (compat_size_t __user *)(sig+sizeof(up))))
1411 return -EFAULT;
1412 }
1413 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1414 sigsetsize);
1415}
1416
1417COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
1418 unsigned int, nfds, struct compat_timespec __user *, tsp,
1419 const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
1420{
1421 compat_sigset_t ss32;
1422 sigset_t ksigmask, sigsaved;
1423 struct compat_timespec ts;
1424 struct timespec end_time, *to = NULL;
1425 int ret;
1426
1427 if (tsp) {
1428 if (copy_from_user(&ts, tsp, sizeof(ts)))
1429 return -EFAULT;
1430
1431 to = &end_time;
1432 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1433 return -EINVAL;
1434 }
1435
1436 if (sigmask) {
1437 if (sigsetsize != sizeof(compat_sigset_t))
1438 return -EINVAL;
1439 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1440 return -EFAULT;
1441 sigset_from_compat(&ksigmask, &ss32);
1442
1443 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1444 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1445 }
1446
1447 ret = do_sys_poll(ufds, nfds, to);
1448
1449 /* We can restart this syscall, usually */
1450 if (ret == -EINTR) {
1451 /*
1452 * Don't restore the signal mask yet. Let do_signal() deliver
1453 * the signal on the way back to userspace, before the signal
1454 * mask is restored.
1455 */
1456 if (sigmask) {
1457 memcpy(¤t->saved_sigmask, &sigsaved,
1458 sizeof(sigsaved));
1459 set_restore_sigmask();
1460 }
1461 ret = -ERESTARTNOHAND;
1462 } else if (sigmask)
1463 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1464
1465 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1466
1467 return ret;
1468}
1469
1470#ifdef CONFIG_FHANDLE
1471/*
1472 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1473 * doesn't set the O_LARGEFILE flag.
1474 */
1475COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1476 struct file_handle __user *, handle, int, flags)
1477{
1478 return do_handle_open(mountdirfd, handle, flags);
1479}
1480#endif
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
59int compat_log = 1;
60
61int 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 */
79asmlinkage 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
94asmlinkage 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
109asmlinkage 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
128asmlinkage 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
133static 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
172asmlinkage 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
184asmlinkage 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
197asmlinkage 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
211asmlinkage 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
222static 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 */
263asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
264{
265 struct kstatfs tmp;
266 int error = user_statfs(pathname, &tmp);
267 if (!error)
268 error = put_compat_statfs(buf, &tmp);
269 return error;
270}
271
272asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
273{
274 struct kstatfs tmp;
275 int error = fd_statfs(fd, &tmp);
276 if (!error)
277 error = put_compat_statfs(buf, &tmp);
278 return error;
279}
280
281static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
282{
283 if (sizeof ubuf->f_blocks == 4) {
284 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
285 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
286 return -EOVERFLOW;
287 /* f_files and f_ffree may be -1; it's okay
288 * to stuff that into 32 bits */
289 if (kbuf->f_files != 0xffffffffffffffffULL
290 && (kbuf->f_files & 0xffffffff00000000ULL))
291 return -EOVERFLOW;
292 if (kbuf->f_ffree != 0xffffffffffffffffULL
293 && (kbuf->f_ffree & 0xffffffff00000000ULL))
294 return -EOVERFLOW;
295 }
296 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
297 __put_user(kbuf->f_type, &ubuf->f_type) ||
298 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
299 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
300 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
301 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
302 __put_user(kbuf->f_files, &ubuf->f_files) ||
303 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
304 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
305 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
306 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
307 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
308 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
309 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
310 return -EFAULT;
311 return 0;
312}
313
314asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
315{
316 struct kstatfs tmp;
317 int error;
318
319 if (sz != sizeof(*buf))
320 return -EINVAL;
321
322 error = user_statfs(pathname, &tmp);
323 if (!error)
324 error = put_compat_statfs64(buf, &tmp);
325 return error;
326}
327
328asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
329{
330 struct kstatfs tmp;
331 int error;
332
333 if (sz != sizeof(*buf))
334 return -EINVAL;
335
336 error = fd_statfs(fd, &tmp);
337 if (!error)
338 error = put_compat_statfs64(buf, &tmp);
339 return error;
340}
341
342/*
343 * This is a copy of sys_ustat, just dealing with a structure layout.
344 * Given how simple this syscall is that apporach is more maintainable
345 * than the various conversion hacks.
346 */
347asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
348{
349 struct super_block *sb;
350 struct compat_ustat tmp;
351 struct kstatfs sbuf;
352 int err;
353
354 sb = user_get_super(new_decode_dev(dev));
355 if (!sb)
356 return -EINVAL;
357 err = statfs_by_dentry(sb->s_root, &sbuf);
358 drop_super(sb);
359 if (err)
360 return err;
361
362 memset(&tmp, 0, sizeof(struct compat_ustat));
363 tmp.f_tfree = sbuf.f_bfree;
364 tmp.f_tinode = sbuf.f_ffree;
365 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
366 return -EFAULT;
367 return 0;
368}
369
370static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
371{
372 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
373 __get_user(kfl->l_type, &ufl->l_type) ||
374 __get_user(kfl->l_whence, &ufl->l_whence) ||
375 __get_user(kfl->l_start, &ufl->l_start) ||
376 __get_user(kfl->l_len, &ufl->l_len) ||
377 __get_user(kfl->l_pid, &ufl->l_pid))
378 return -EFAULT;
379 return 0;
380}
381
382static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
383{
384 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
385 __put_user(kfl->l_type, &ufl->l_type) ||
386 __put_user(kfl->l_whence, &ufl->l_whence) ||
387 __put_user(kfl->l_start, &ufl->l_start) ||
388 __put_user(kfl->l_len, &ufl->l_len) ||
389 __put_user(kfl->l_pid, &ufl->l_pid))
390 return -EFAULT;
391 return 0;
392}
393
394#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
395static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
396{
397 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
398 __get_user(kfl->l_type, &ufl->l_type) ||
399 __get_user(kfl->l_whence, &ufl->l_whence) ||
400 __get_user(kfl->l_start, &ufl->l_start) ||
401 __get_user(kfl->l_len, &ufl->l_len) ||
402 __get_user(kfl->l_pid, &ufl->l_pid))
403 return -EFAULT;
404 return 0;
405}
406#endif
407
408#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
409static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
410{
411 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
412 __put_user(kfl->l_type, &ufl->l_type) ||
413 __put_user(kfl->l_whence, &ufl->l_whence) ||
414 __put_user(kfl->l_start, &ufl->l_start) ||
415 __put_user(kfl->l_len, &ufl->l_len) ||
416 __put_user(kfl->l_pid, &ufl->l_pid))
417 return -EFAULT;
418 return 0;
419}
420#endif
421
422asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
423 unsigned long arg)
424{
425 mm_segment_t old_fs;
426 struct flock f;
427 long ret;
428
429 switch (cmd) {
430 case F_GETLK:
431 case F_SETLK:
432 case F_SETLKW:
433 ret = get_compat_flock(&f, compat_ptr(arg));
434 if (ret != 0)
435 break;
436 old_fs = get_fs();
437 set_fs(KERNEL_DS);
438 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
439 set_fs(old_fs);
440 if (cmd == F_GETLK && ret == 0) {
441 /* GETLK was successful and we need to return the data...
442 * but it needs to fit in the compat structure.
443 * l_start shouldn't be too big, unless the original
444 * start + end is greater than COMPAT_OFF_T_MAX, in which
445 * case the app was asking for trouble, so we return
446 * -EOVERFLOW in that case.
447 * l_len could be too big, in which case we just truncate it,
448 * and only allow the app to see that part of the conflicting
449 * lock that might make sense to it anyway
450 */
451
452 if (f.l_start > COMPAT_OFF_T_MAX)
453 ret = -EOVERFLOW;
454 if (f.l_len > COMPAT_OFF_T_MAX)
455 f.l_len = COMPAT_OFF_T_MAX;
456 if (ret == 0)
457 ret = put_compat_flock(&f, compat_ptr(arg));
458 }
459 break;
460
461 case F_GETLK64:
462 case F_SETLK64:
463 case F_SETLKW64:
464 ret = get_compat_flock64(&f, compat_ptr(arg));
465 if (ret != 0)
466 break;
467 old_fs = get_fs();
468 set_fs(KERNEL_DS);
469 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
470 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
471 (unsigned long)&f);
472 set_fs(old_fs);
473 if (cmd == F_GETLK64 && ret == 0) {
474 /* need to return lock information - see above for commentary */
475 if (f.l_start > COMPAT_LOFF_T_MAX)
476 ret = -EOVERFLOW;
477 if (f.l_len > COMPAT_LOFF_T_MAX)
478 f.l_len = COMPAT_LOFF_T_MAX;
479 if (ret == 0)
480 ret = put_compat_flock64(&f, compat_ptr(arg));
481 }
482 break;
483
484 default:
485 ret = sys_fcntl(fd, cmd, arg);
486 break;
487 }
488 return ret;
489}
490
491asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
492 unsigned long arg)
493{
494 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
495 return -EINVAL;
496 return compat_sys_fcntl64(fd, cmd, arg);
497}
498
499asmlinkage long
500compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
501{
502 long ret;
503 aio_context_t ctx64;
504
505 mm_segment_t oldfs = get_fs();
506 if (unlikely(get_user(ctx64, ctx32p)))
507 return -EFAULT;
508
509 set_fs(KERNEL_DS);
510 /* The __user pointer cast is valid because of the set_fs() */
511 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
512 set_fs(oldfs);
513 /* truncating is ok because it's a user address */
514 if (!ret)
515 ret = put_user((u32) ctx64, ctx32p);
516 return ret;
517}
518
519asmlinkage long
520compat_sys_io_getevents(aio_context_t ctx_id,
521 unsigned long min_nr,
522 unsigned long nr,
523 struct io_event __user *events,
524 struct compat_timespec __user *timeout)
525{
526 long ret;
527 struct timespec t;
528 struct timespec __user *ut = NULL;
529
530 ret = -EFAULT;
531 if (unlikely(!access_ok(VERIFY_WRITE, events,
532 nr * sizeof(struct io_event))))
533 goto out;
534 if (timeout) {
535 if (get_compat_timespec(&t, timeout))
536 goto out;
537
538 ut = compat_alloc_user_space(sizeof(*ut));
539 if (copy_to_user(ut, &t, sizeof(t)) )
540 goto out;
541 }
542 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
543out:
544 return ret;
545}
546
547/* A write operation does a read from user space and vice versa */
548#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
549
550ssize_t compat_rw_copy_check_uvector(int type,
551 const struct compat_iovec __user *uvector, unsigned long nr_segs,
552 unsigned long fast_segs, struct iovec *fast_pointer,
553 struct iovec **ret_pointer)
554{
555 compat_ssize_t tot_len;
556 struct iovec *iov = *ret_pointer = fast_pointer;
557 ssize_t ret = 0;
558 int seg;
559
560 /*
561 * SuS says "The readv() function *may* fail if the iovcnt argument
562 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
563 * traditionally returned zero for zero segments, so...
564 */
565 if (nr_segs == 0)
566 goto out;
567
568 ret = -EINVAL;
569 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
570 goto out;
571 if (nr_segs > fast_segs) {
572 ret = -ENOMEM;
573 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
574 if (iov == NULL)
575 goto out;
576 }
577 *ret_pointer = iov;
578
579 /*
580 * Single unix specification:
581 * We should -EINVAL if an element length is not >= 0 and fitting an
582 * ssize_t.
583 *
584 * In Linux, the total length is limited to MAX_RW_COUNT, there is
585 * no overflow possibility.
586 */
587 tot_len = 0;
588 ret = -EINVAL;
589 for (seg = 0; seg < nr_segs; seg++) {
590 compat_uptr_t buf;
591 compat_ssize_t len;
592
593 if (__get_user(len, &uvector->iov_len) ||
594 __get_user(buf, &uvector->iov_base)) {
595 ret = -EFAULT;
596 goto out;
597 }
598 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
599 goto out;
600 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
601 ret = -EFAULT;
602 goto out;
603 }
604 if (len > MAX_RW_COUNT - tot_len)
605 len = MAX_RW_COUNT - tot_len;
606 tot_len += len;
607 iov->iov_base = compat_ptr(buf);
608 iov->iov_len = (compat_size_t) len;
609 uvector++;
610 iov++;
611 }
612 ret = tot_len;
613
614out:
615 return ret;
616}
617
618static inline long
619copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
620{
621 compat_uptr_t uptr;
622 int i;
623
624 for (i = 0; i < nr; ++i) {
625 if (get_user(uptr, ptr32 + i))
626 return -EFAULT;
627 if (put_user(compat_ptr(uptr), ptr64 + i))
628 return -EFAULT;
629 }
630 return 0;
631}
632
633#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
634
635asmlinkage long
636compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
637{
638 struct iocb __user * __user *iocb64;
639 long ret;
640
641 if (unlikely(nr < 0))
642 return -EINVAL;
643
644 if (nr > MAX_AIO_SUBMITS)
645 nr = MAX_AIO_SUBMITS;
646
647 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
648 ret = copy_iocb(nr, iocb, iocb64);
649 if (!ret)
650 ret = do_io_submit(ctx_id, nr, iocb64, 1);
651 return ret;
652}
653
654struct compat_ncp_mount_data {
655 compat_int_t version;
656 compat_uint_t ncp_fd;
657 __compat_uid_t mounted_uid;
658 compat_pid_t wdog_pid;
659 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
660 compat_uint_t time_out;
661 compat_uint_t retry_count;
662 compat_uint_t flags;
663 __compat_uid_t uid;
664 __compat_gid_t gid;
665 compat_mode_t file_mode;
666 compat_mode_t dir_mode;
667};
668
669struct compat_ncp_mount_data_v4 {
670 compat_int_t version;
671 compat_ulong_t flags;
672 compat_ulong_t mounted_uid;
673 compat_long_t wdog_pid;
674 compat_uint_t ncp_fd;
675 compat_uint_t time_out;
676 compat_uint_t retry_count;
677 compat_ulong_t uid;
678 compat_ulong_t gid;
679 compat_ulong_t file_mode;
680 compat_ulong_t dir_mode;
681};
682
683static void *do_ncp_super_data_conv(void *raw_data)
684{
685 int version = *(unsigned int *)raw_data;
686
687 if (version == 3) {
688 struct compat_ncp_mount_data *c_n = raw_data;
689 struct ncp_mount_data *n = raw_data;
690
691 n->dir_mode = c_n->dir_mode;
692 n->file_mode = c_n->file_mode;
693 n->gid = c_n->gid;
694 n->uid = c_n->uid;
695 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
696 n->wdog_pid = c_n->wdog_pid;
697 n->mounted_uid = c_n->mounted_uid;
698 } else if (version == 4) {
699 struct compat_ncp_mount_data_v4 *c_n = raw_data;
700 struct ncp_mount_data_v4 *n = raw_data;
701
702 n->dir_mode = c_n->dir_mode;
703 n->file_mode = c_n->file_mode;
704 n->gid = c_n->gid;
705 n->uid = c_n->uid;
706 n->retry_count = c_n->retry_count;
707 n->time_out = c_n->time_out;
708 n->ncp_fd = c_n->ncp_fd;
709 n->wdog_pid = c_n->wdog_pid;
710 n->mounted_uid = c_n->mounted_uid;
711 n->flags = c_n->flags;
712 } else if (version != 5) {
713 return NULL;
714 }
715
716 return raw_data;
717}
718
719
720struct compat_nfs_string {
721 compat_uint_t len;
722 compat_uptr_t data;
723};
724
725static inline void compat_nfs_string(struct nfs_string *dst,
726 struct compat_nfs_string *src)
727{
728 dst->data = compat_ptr(src->data);
729 dst->len = src->len;
730}
731
732struct compat_nfs4_mount_data_v1 {
733 compat_int_t version;
734 compat_int_t flags;
735 compat_int_t rsize;
736 compat_int_t wsize;
737 compat_int_t timeo;
738 compat_int_t retrans;
739 compat_int_t acregmin;
740 compat_int_t acregmax;
741 compat_int_t acdirmin;
742 compat_int_t acdirmax;
743 struct compat_nfs_string client_addr;
744 struct compat_nfs_string mnt_path;
745 struct compat_nfs_string hostname;
746 compat_uint_t host_addrlen;
747 compat_uptr_t host_addr;
748 compat_int_t proto;
749 compat_int_t auth_flavourlen;
750 compat_uptr_t auth_flavours;
751};
752
753static int do_nfs4_super_data_conv(void *raw_data)
754{
755 int version = *(compat_uint_t *) raw_data;
756
757 if (version == 1) {
758 struct compat_nfs4_mount_data_v1 *raw = raw_data;
759 struct nfs4_mount_data *real = raw_data;
760
761 /* copy the fields backwards */
762 real->auth_flavours = compat_ptr(raw->auth_flavours);
763 real->auth_flavourlen = raw->auth_flavourlen;
764 real->proto = raw->proto;
765 real->host_addr = compat_ptr(raw->host_addr);
766 real->host_addrlen = raw->host_addrlen;
767 compat_nfs_string(&real->hostname, &raw->hostname);
768 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
769 compat_nfs_string(&real->client_addr, &raw->client_addr);
770 real->acdirmax = raw->acdirmax;
771 real->acdirmin = raw->acdirmin;
772 real->acregmax = raw->acregmax;
773 real->acregmin = raw->acregmin;
774 real->retrans = raw->retrans;
775 real->timeo = raw->timeo;
776 real->wsize = raw->wsize;
777 real->rsize = raw->rsize;
778 real->flags = raw->flags;
779 real->version = raw->version;
780 }
781
782 return 0;
783}
784
785#define NCPFS_NAME "ncpfs"
786#define NFS4_NAME "nfs4"
787
788asmlinkage long compat_sys_mount(const char __user * dev_name,
789 const char __user * dir_name,
790 const char __user * type, unsigned long flags,
791 const void __user * data)
792{
793 char *kernel_type;
794 unsigned long data_page;
795 char *kernel_dev;
796 char *dir_page;
797 int retval;
798
799 retval = copy_mount_string(type, &kernel_type);
800 if (retval < 0)
801 goto out;
802
803 dir_page = getname(dir_name);
804 retval = PTR_ERR(dir_page);
805 if (IS_ERR(dir_page))
806 goto out1;
807
808 retval = copy_mount_string(dev_name, &kernel_dev);
809 if (retval < 0)
810 goto out2;
811
812 retval = copy_mount_options(data, &data_page);
813 if (retval < 0)
814 goto out3;
815
816 retval = -EINVAL;
817
818 if (kernel_type && data_page) {
819 if (!strcmp(kernel_type, NCPFS_NAME)) {
820 do_ncp_super_data_conv((void *)data_page);
821 } else if (!strcmp(kernel_type, NFS4_NAME)) {
822 if (do_nfs4_super_data_conv((void *) data_page))
823 goto out4;
824 }
825 }
826
827 retval = do_mount(kernel_dev, dir_page, kernel_type,
828 flags, (void*)data_page);
829
830 out4:
831 free_page(data_page);
832 out3:
833 kfree(kernel_dev);
834 out2:
835 putname(dir_page);
836 out1:
837 kfree(kernel_type);
838 out:
839 return retval;
840}
841
842struct compat_old_linux_dirent {
843 compat_ulong_t d_ino;
844 compat_ulong_t d_offset;
845 unsigned short d_namlen;
846 char d_name[1];
847};
848
849struct compat_readdir_callback {
850 struct compat_old_linux_dirent __user *dirent;
851 int result;
852};
853
854static int compat_fillonedir(void *__buf, const char *name, int namlen,
855 loff_t offset, u64 ino, unsigned int d_type)
856{
857 struct compat_readdir_callback *buf = __buf;
858 struct compat_old_linux_dirent __user *dirent;
859 compat_ulong_t d_ino;
860
861 if (buf->result)
862 return -EINVAL;
863 d_ino = ino;
864 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
865 buf->result = -EOVERFLOW;
866 return -EOVERFLOW;
867 }
868 buf->result++;
869 dirent = buf->dirent;
870 if (!access_ok(VERIFY_WRITE, dirent,
871 (unsigned long)(dirent->d_name + namlen + 1) -
872 (unsigned long)dirent))
873 goto efault;
874 if ( __put_user(d_ino, &dirent->d_ino) ||
875 __put_user(offset, &dirent->d_offset) ||
876 __put_user(namlen, &dirent->d_namlen) ||
877 __copy_to_user(dirent->d_name, name, namlen) ||
878 __put_user(0, dirent->d_name + namlen))
879 goto efault;
880 return 0;
881efault:
882 buf->result = -EFAULT;
883 return -EFAULT;
884}
885
886asmlinkage long compat_sys_old_readdir(unsigned int fd,
887 struct compat_old_linux_dirent __user *dirent, unsigned int count)
888{
889 int error;
890 struct file *file;
891 struct compat_readdir_callback buf;
892
893 error = -EBADF;
894 file = fget(fd);
895 if (!file)
896 goto out;
897
898 buf.result = 0;
899 buf.dirent = dirent;
900
901 error = vfs_readdir(file, compat_fillonedir, &buf);
902 if (buf.result)
903 error = buf.result;
904
905 fput(file);
906out:
907 return error;
908}
909
910struct compat_linux_dirent {
911 compat_ulong_t d_ino;
912 compat_ulong_t d_off;
913 unsigned short d_reclen;
914 char d_name[1];
915};
916
917struct compat_getdents_callback {
918 struct compat_linux_dirent __user *current_dir;
919 struct compat_linux_dirent __user *previous;
920 int count;
921 int error;
922};
923
924static int compat_filldir(void *__buf, const char *name, int namlen,
925 loff_t offset, u64 ino, unsigned int d_type)
926{
927 struct compat_linux_dirent __user * dirent;
928 struct compat_getdents_callback *buf = __buf;
929 compat_ulong_t d_ino;
930 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
931 namlen + 2, sizeof(compat_long_t));
932
933 buf->error = -EINVAL; /* only used if we fail.. */
934 if (reclen > buf->count)
935 return -EINVAL;
936 d_ino = ino;
937 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
938 buf->error = -EOVERFLOW;
939 return -EOVERFLOW;
940 }
941 dirent = buf->previous;
942 if (dirent) {
943 if (__put_user(offset, &dirent->d_off))
944 goto efault;
945 }
946 dirent = buf->current_dir;
947 if (__put_user(d_ino, &dirent->d_ino))
948 goto efault;
949 if (__put_user(reclen, &dirent->d_reclen))
950 goto efault;
951 if (copy_to_user(dirent->d_name, name, namlen))
952 goto efault;
953 if (__put_user(0, dirent->d_name + namlen))
954 goto efault;
955 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
956 goto efault;
957 buf->previous = dirent;
958 dirent = (void __user *)dirent + reclen;
959 buf->current_dir = dirent;
960 buf->count -= reclen;
961 return 0;
962efault:
963 buf->error = -EFAULT;
964 return -EFAULT;
965}
966
967asmlinkage long compat_sys_getdents(unsigned int fd,
968 struct compat_linux_dirent __user *dirent, unsigned int count)
969{
970 struct file * file;
971 struct compat_linux_dirent __user * lastdirent;
972 struct compat_getdents_callback buf;
973 int error;
974
975 error = -EFAULT;
976 if (!access_ok(VERIFY_WRITE, dirent, count))
977 goto out;
978
979 error = -EBADF;
980 file = fget(fd);
981 if (!file)
982 goto out;
983
984 buf.current_dir = dirent;
985 buf.previous = NULL;
986 buf.count = count;
987 buf.error = 0;
988
989 error = vfs_readdir(file, compat_filldir, &buf);
990 if (error >= 0)
991 error = buf.error;
992 lastdirent = buf.previous;
993 if (lastdirent) {
994 if (put_user(file->f_pos, &lastdirent->d_off))
995 error = -EFAULT;
996 else
997 error = count - buf.count;
998 }
999 fput(file);
1000out:
1001 return error;
1002}
1003
1004#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1005
1006struct compat_getdents_callback64 {
1007 struct linux_dirent64 __user *current_dir;
1008 struct linux_dirent64 __user *previous;
1009 int count;
1010 int error;
1011};
1012
1013static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1014 u64 ino, unsigned int d_type)
1015{
1016 struct linux_dirent64 __user *dirent;
1017 struct compat_getdents_callback64 *buf = __buf;
1018 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1019 sizeof(u64));
1020 u64 off;
1021
1022 buf->error = -EINVAL; /* only used if we fail.. */
1023 if (reclen > buf->count)
1024 return -EINVAL;
1025 dirent = buf->previous;
1026
1027 if (dirent) {
1028 if (__put_user_unaligned(offset, &dirent->d_off))
1029 goto efault;
1030 }
1031 dirent = buf->current_dir;
1032 if (__put_user_unaligned(ino, &dirent->d_ino))
1033 goto efault;
1034 off = 0;
1035 if (__put_user_unaligned(off, &dirent->d_off))
1036 goto efault;
1037 if (__put_user(reclen, &dirent->d_reclen))
1038 goto efault;
1039 if (__put_user(d_type, &dirent->d_type))
1040 goto efault;
1041 if (copy_to_user(dirent->d_name, name, namlen))
1042 goto efault;
1043 if (__put_user(0, dirent->d_name + namlen))
1044 goto efault;
1045 buf->previous = dirent;
1046 dirent = (void __user *)dirent + reclen;
1047 buf->current_dir = dirent;
1048 buf->count -= reclen;
1049 return 0;
1050efault:
1051 buf->error = -EFAULT;
1052 return -EFAULT;
1053}
1054
1055asmlinkage long compat_sys_getdents64(unsigned int fd,
1056 struct linux_dirent64 __user * dirent, unsigned int count)
1057{
1058 struct file * file;
1059 struct linux_dirent64 __user * lastdirent;
1060 struct compat_getdents_callback64 buf;
1061 int error;
1062
1063 error = -EFAULT;
1064 if (!access_ok(VERIFY_WRITE, dirent, count))
1065 goto out;
1066
1067 error = -EBADF;
1068 file = fget(fd);
1069 if (!file)
1070 goto out;
1071
1072 buf.current_dir = dirent;
1073 buf.previous = NULL;
1074 buf.count = count;
1075 buf.error = 0;
1076
1077 error = vfs_readdir(file, compat_filldir64, &buf);
1078 if (error >= 0)
1079 error = buf.error;
1080 lastdirent = buf.previous;
1081 if (lastdirent) {
1082 typeof(lastdirent->d_off) d_off = file->f_pos;
1083 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1084 error = -EFAULT;
1085 else
1086 error = count - buf.count;
1087 }
1088 fput(file);
1089out:
1090 return error;
1091}
1092#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1093
1094static ssize_t compat_do_readv_writev(int type, struct file *file,
1095 const struct compat_iovec __user *uvector,
1096 unsigned long nr_segs, loff_t *pos)
1097{
1098 compat_ssize_t tot_len;
1099 struct iovec iovstack[UIO_FASTIOV];
1100 struct iovec *iov = iovstack;
1101 ssize_t ret;
1102 io_fn_t fn;
1103 iov_fn_t fnv;
1104
1105 ret = -EINVAL;
1106 if (!file->f_op)
1107 goto out;
1108
1109 ret = -EFAULT;
1110 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1111 goto out;
1112
1113 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1114 UIO_FASTIOV, iovstack, &iov);
1115 if (tot_len == 0) {
1116 ret = 0;
1117 goto out;
1118 }
1119
1120 ret = rw_verify_area(type, file, pos, tot_len);
1121 if (ret < 0)
1122 goto out;
1123
1124 fnv = NULL;
1125 if (type == READ) {
1126 fn = file->f_op->read;
1127 fnv = file->f_op->aio_read;
1128 } else {
1129 fn = (io_fn_t)file->f_op->write;
1130 fnv = file->f_op->aio_write;
1131 }
1132
1133 if (fnv)
1134 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1135 pos, fnv);
1136 else
1137 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1138
1139out:
1140 if (iov != iovstack)
1141 kfree(iov);
1142 if ((ret + (type == READ)) > 0) {
1143 if (type == READ)
1144 fsnotify_access(file);
1145 else
1146 fsnotify_modify(file);
1147 }
1148 return ret;
1149}
1150
1151static size_t compat_readv(struct file *file,
1152 const struct compat_iovec __user *vec,
1153 unsigned long vlen, loff_t *pos)
1154{
1155 ssize_t ret = -EBADF;
1156
1157 if (!(file->f_mode & FMODE_READ))
1158 goto out;
1159
1160 ret = -EINVAL;
1161 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1162 goto out;
1163
1164 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1165
1166out:
1167 if (ret > 0)
1168 add_rchar(current, ret);
1169 inc_syscr(current);
1170 return ret;
1171}
1172
1173asmlinkage ssize_t
1174compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1175 unsigned long vlen)
1176{
1177 struct file *file;
1178 int fput_needed;
1179 ssize_t ret;
1180
1181 file = fget_light(fd, &fput_needed);
1182 if (!file)
1183 return -EBADF;
1184 ret = compat_readv(file, vec, vlen, &file->f_pos);
1185 fput_light(file, fput_needed);
1186 return ret;
1187}
1188
1189asmlinkage ssize_t
1190compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1191 unsigned long vlen, u32 pos_low, u32 pos_high)
1192{
1193 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1194 struct file *file;
1195 int fput_needed;
1196 ssize_t ret;
1197
1198 if (pos < 0)
1199 return -EINVAL;
1200 file = fget_light(fd, &fput_needed);
1201 if (!file)
1202 return -EBADF;
1203 ret = -ESPIPE;
1204 if (file->f_mode & FMODE_PREAD)
1205 ret = compat_readv(file, vec, vlen, &pos);
1206 fput_light(file, fput_needed);
1207 return ret;
1208}
1209
1210static size_t compat_writev(struct file *file,
1211 const struct compat_iovec __user *vec,
1212 unsigned long vlen, loff_t *pos)
1213{
1214 ssize_t ret = -EBADF;
1215
1216 if (!(file->f_mode & FMODE_WRITE))
1217 goto out;
1218
1219 ret = -EINVAL;
1220 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1221 goto out;
1222
1223 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1224
1225out:
1226 if (ret > 0)
1227 add_wchar(current, ret);
1228 inc_syscw(current);
1229 return ret;
1230}
1231
1232asmlinkage ssize_t
1233compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1234 unsigned long vlen)
1235{
1236 struct file *file;
1237 int fput_needed;
1238 ssize_t ret;
1239
1240 file = fget_light(fd, &fput_needed);
1241 if (!file)
1242 return -EBADF;
1243 ret = compat_writev(file, vec, vlen, &file->f_pos);
1244 fput_light(file, fput_needed);
1245 return ret;
1246}
1247
1248asmlinkage ssize_t
1249compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1250 unsigned long vlen, u32 pos_low, u32 pos_high)
1251{
1252 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1253 struct file *file;
1254 int fput_needed;
1255 ssize_t ret;
1256
1257 if (pos < 0)
1258 return -EINVAL;
1259 file = fget_light(fd, &fput_needed);
1260 if (!file)
1261 return -EBADF;
1262 ret = -ESPIPE;
1263 if (file->f_mode & FMODE_PWRITE)
1264 ret = compat_writev(file, vec, vlen, &pos);
1265 fput_light(file, fput_needed);
1266 return ret;
1267}
1268
1269asmlinkage long
1270compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1271 unsigned int nr_segs, unsigned int flags)
1272{
1273 unsigned i;
1274 struct iovec __user *iov;
1275 if (nr_segs > UIO_MAXIOV)
1276 return -EINVAL;
1277 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1278 for (i = 0; i < nr_segs; i++) {
1279 struct compat_iovec v;
1280 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1281 get_user(v.iov_len, &iov32[i].iov_len) ||
1282 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1283 put_user(v.iov_len, &iov[i].iov_len))
1284 return -EFAULT;
1285 }
1286 return sys_vmsplice(fd, iov, nr_segs, flags);
1287}
1288
1289/*
1290 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1291 * O_LARGEFILE flag.
1292 */
1293asmlinkage long
1294compat_sys_open(const char __user *filename, int flags, int mode)
1295{
1296 return do_sys_open(AT_FDCWD, filename, flags, mode);
1297}
1298
1299/*
1300 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1301 * O_LARGEFILE flag.
1302 */
1303asmlinkage long
1304compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1305{
1306 return do_sys_open(dfd, filename, flags, mode);
1307}
1308
1309#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1310
1311static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1312 int timeval, int ret)
1313{
1314 struct timespec ts;
1315
1316 if (!p)
1317 return ret;
1318
1319 if (current->personality & STICKY_TIMEOUTS)
1320 goto sticky;
1321
1322 /* No update for zero timeout */
1323 if (!end_time->tv_sec && !end_time->tv_nsec)
1324 return ret;
1325
1326 ktime_get_ts(&ts);
1327 ts = timespec_sub(*end_time, ts);
1328 if (ts.tv_sec < 0)
1329 ts.tv_sec = ts.tv_nsec = 0;
1330
1331 if (timeval) {
1332 struct compat_timeval rtv;
1333
1334 rtv.tv_sec = ts.tv_sec;
1335 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1336
1337 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1338 return ret;
1339 } else {
1340 struct compat_timespec rts;
1341
1342 rts.tv_sec = ts.tv_sec;
1343 rts.tv_nsec = ts.tv_nsec;
1344
1345 if (!copy_to_user(p, &rts, sizeof(rts)))
1346 return ret;
1347 }
1348 /*
1349 * If an application puts its timeval in read-only memory, we
1350 * don't want the Linux-specific update to the timeval to
1351 * cause a fault after the select has completed
1352 * successfully. However, because we're not updating the
1353 * timeval, we can't restart the system call.
1354 */
1355
1356sticky:
1357 if (ret == -ERESTARTNOHAND)
1358 ret = -EINTR;
1359 return ret;
1360}
1361
1362/*
1363 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1364 * 64-bit unsigned longs.
1365 */
1366static
1367int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1368 unsigned long *fdset)
1369{
1370 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1371 if (ufdset) {
1372 unsigned long odd;
1373
1374 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1375 return -EFAULT;
1376
1377 odd = nr & 1UL;
1378 nr &= ~1UL;
1379 while (nr) {
1380 unsigned long h, l;
1381 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1382 return -EFAULT;
1383 ufdset += 2;
1384 *fdset++ = h << 32 | l;
1385 nr -= 2;
1386 }
1387 if (odd && __get_user(*fdset, ufdset))
1388 return -EFAULT;
1389 } else {
1390 /* Tricky, must clear full unsigned long in the
1391 * kernel fdset at the end, this makes sure that
1392 * actually happens.
1393 */
1394 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1395 }
1396 return 0;
1397}
1398
1399static
1400int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1401 unsigned long *fdset)
1402{
1403 unsigned long odd;
1404 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1405
1406 if (!ufdset)
1407 return 0;
1408
1409 odd = nr & 1UL;
1410 nr &= ~1UL;
1411 while (nr) {
1412 unsigned long h, l;
1413 l = *fdset++;
1414 h = l >> 32;
1415 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1416 return -EFAULT;
1417 ufdset += 2;
1418 nr -= 2;
1419 }
1420 if (odd && __put_user(*fdset, ufdset))
1421 return -EFAULT;
1422 return 0;
1423}
1424
1425
1426/*
1427 * This is a virtual copy of sys_select from fs/select.c and probably
1428 * should be compared to it from time to time
1429 */
1430
1431/*
1432 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1433 * like to be certain this leads to no problems. So I return
1434 * EINTR just for safety.
1435 *
1436 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1437 * I'm trying ERESTARTNOHAND which restart only when you want to.
1438 */
1439int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1440 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1441 struct timespec *end_time)
1442{
1443 fd_set_bits fds;
1444 void *bits;
1445 int size, max_fds, ret = -EINVAL;
1446 struct fdtable *fdt;
1447 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1448
1449 if (n < 0)
1450 goto out_nofds;
1451
1452 /* max_fds can increase, so grab it once to avoid race */
1453 rcu_read_lock();
1454 fdt = files_fdtable(current->files);
1455 max_fds = fdt->max_fds;
1456 rcu_read_unlock();
1457 if (n > max_fds)
1458 n = max_fds;
1459
1460 /*
1461 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1462 * since we used fdset we need to allocate memory in units of
1463 * long-words.
1464 */
1465 size = FDS_BYTES(n);
1466 bits = stack_fds;
1467 if (size > sizeof(stack_fds) / 6) {
1468 bits = kmalloc(6 * size, GFP_KERNEL);
1469 ret = -ENOMEM;
1470 if (!bits)
1471 goto out_nofds;
1472 }
1473 fds.in = (unsigned long *) bits;
1474 fds.out = (unsigned long *) (bits + size);
1475 fds.ex = (unsigned long *) (bits + 2*size);
1476 fds.res_in = (unsigned long *) (bits + 3*size);
1477 fds.res_out = (unsigned long *) (bits + 4*size);
1478 fds.res_ex = (unsigned long *) (bits + 5*size);
1479
1480 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1481 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1482 (ret = compat_get_fd_set(n, exp, fds.ex)))
1483 goto out;
1484 zero_fd_set(n, fds.res_in);
1485 zero_fd_set(n, fds.res_out);
1486 zero_fd_set(n, fds.res_ex);
1487
1488 ret = do_select(n, &fds, end_time);
1489
1490 if (ret < 0)
1491 goto out;
1492 if (!ret) {
1493 ret = -ERESTARTNOHAND;
1494 if (signal_pending(current))
1495 goto out;
1496 ret = 0;
1497 }
1498
1499 if (compat_set_fd_set(n, inp, fds.res_in) ||
1500 compat_set_fd_set(n, outp, fds.res_out) ||
1501 compat_set_fd_set(n, exp, fds.res_ex))
1502 ret = -EFAULT;
1503out:
1504 if (bits != stack_fds)
1505 kfree(bits);
1506out_nofds:
1507 return ret;
1508}
1509
1510asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1511 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1512 struct compat_timeval __user *tvp)
1513{
1514 struct timespec end_time, *to = NULL;
1515 struct compat_timeval tv;
1516 int ret;
1517
1518 if (tvp) {
1519 if (copy_from_user(&tv, tvp, sizeof(tv)))
1520 return -EFAULT;
1521
1522 to = &end_time;
1523 if (poll_select_set_timeout(to,
1524 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1525 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1526 return -EINVAL;
1527 }
1528
1529 ret = compat_core_sys_select(n, inp, outp, exp, to);
1530 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1531
1532 return ret;
1533}
1534
1535struct compat_sel_arg_struct {
1536 compat_ulong_t n;
1537 compat_uptr_t inp;
1538 compat_uptr_t outp;
1539 compat_uptr_t exp;
1540 compat_uptr_t tvp;
1541};
1542
1543asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1544{
1545 struct compat_sel_arg_struct a;
1546
1547 if (copy_from_user(&a, arg, sizeof(a)))
1548 return -EFAULT;
1549 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1550 compat_ptr(a.exp), compat_ptr(a.tvp));
1551}
1552
1553#ifdef HAVE_SET_RESTORE_SIGMASK
1554static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1555 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1556 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1557 compat_size_t sigsetsize)
1558{
1559 compat_sigset_t ss32;
1560 sigset_t ksigmask, sigsaved;
1561 struct compat_timespec ts;
1562 struct timespec end_time, *to = NULL;
1563 int ret;
1564
1565 if (tsp) {
1566 if (copy_from_user(&ts, tsp, sizeof(ts)))
1567 return -EFAULT;
1568
1569 to = &end_time;
1570 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1571 return -EINVAL;
1572 }
1573
1574 if (sigmask) {
1575 if (sigsetsize != sizeof(compat_sigset_t))
1576 return -EINVAL;
1577 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1578 return -EFAULT;
1579 sigset_from_compat(&ksigmask, &ss32);
1580
1581 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1582 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1583 }
1584
1585 ret = compat_core_sys_select(n, inp, outp, exp, to);
1586 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1587
1588 if (ret == -ERESTARTNOHAND) {
1589 /*
1590 * Don't restore the signal mask yet. Let do_signal() deliver
1591 * the signal on the way back to userspace, before the signal
1592 * mask is restored.
1593 */
1594 if (sigmask) {
1595 memcpy(¤t->saved_sigmask, &sigsaved,
1596 sizeof(sigsaved));
1597 set_restore_sigmask();
1598 }
1599 } else if (sigmask)
1600 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1601
1602 return ret;
1603}
1604
1605asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1606 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1607 struct compat_timespec __user *tsp, void __user *sig)
1608{
1609 compat_size_t sigsetsize = 0;
1610 compat_uptr_t up = 0;
1611
1612 if (sig) {
1613 if (!access_ok(VERIFY_READ, sig,
1614 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1615 __get_user(up, (compat_uptr_t __user *)sig) ||
1616 __get_user(sigsetsize,
1617 (compat_size_t __user *)(sig+sizeof(up))))
1618 return -EFAULT;
1619 }
1620 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1621 sigsetsize);
1622}
1623
1624asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1625 unsigned int nfds, struct compat_timespec __user *tsp,
1626 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1627{
1628 compat_sigset_t ss32;
1629 sigset_t ksigmask, sigsaved;
1630 struct compat_timespec ts;
1631 struct timespec end_time, *to = NULL;
1632 int ret;
1633
1634 if (tsp) {
1635 if (copy_from_user(&ts, tsp, sizeof(ts)))
1636 return -EFAULT;
1637
1638 to = &end_time;
1639 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1640 return -EINVAL;
1641 }
1642
1643 if (sigmask) {
1644 if (sigsetsize != sizeof(compat_sigset_t))
1645 return -EINVAL;
1646 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1647 return -EFAULT;
1648 sigset_from_compat(&ksigmask, &ss32);
1649
1650 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1651 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1652 }
1653
1654 ret = do_sys_poll(ufds, nfds, to);
1655
1656 /* We can restart this syscall, usually */
1657 if (ret == -EINTR) {
1658 /*
1659 * Don't restore the signal mask yet. Let do_signal() deliver
1660 * the signal on the way back to userspace, before the signal
1661 * mask is restored.
1662 */
1663 if (sigmask) {
1664 memcpy(¤t->saved_sigmask, &sigsaved,
1665 sizeof(sigsaved));
1666 set_restore_sigmask();
1667 }
1668 ret = -ERESTARTNOHAND;
1669 } else if (sigmask)
1670 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1671
1672 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1673
1674 return ret;
1675}
1676#endif /* HAVE_SET_RESTORE_SIGMASK */
1677
1678#ifdef CONFIG_EPOLL
1679
1680#ifdef HAVE_SET_RESTORE_SIGMASK
1681asmlinkage long compat_sys_epoll_pwait(int epfd,
1682 struct compat_epoll_event __user *events,
1683 int maxevents, int timeout,
1684 const compat_sigset_t __user *sigmask,
1685 compat_size_t sigsetsize)
1686{
1687 long err;
1688 compat_sigset_t csigmask;
1689 sigset_t ksigmask, sigsaved;
1690
1691 /*
1692 * If the caller wants a certain signal mask to be set during the wait,
1693 * we apply it here.
1694 */
1695 if (sigmask) {
1696 if (sigsetsize != sizeof(compat_sigset_t))
1697 return -EINVAL;
1698 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1699 return -EFAULT;
1700 sigset_from_compat(&ksigmask, &csigmask);
1701 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1702 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1703 }
1704
1705 err = sys_epoll_wait(epfd, events, maxevents, timeout);
1706
1707 /*
1708 * If we changed the signal mask, we need to restore the original one.
1709 * In case we've got a signal while waiting, we do not restore the
1710 * signal mask yet, and we allow do_signal() to deliver the signal on
1711 * the way back to userspace, before the signal mask is restored.
1712 */
1713 if (sigmask) {
1714 if (err == -EINTR) {
1715 memcpy(¤t->saved_sigmask, &sigsaved,
1716 sizeof(sigsaved));
1717 set_restore_sigmask();
1718 } else
1719 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1720 }
1721
1722 return err;
1723}
1724#endif /* HAVE_SET_RESTORE_SIGMASK */
1725
1726#endif /* CONFIG_EPOLL */
1727
1728#ifdef CONFIG_SIGNALFD
1729
1730asmlinkage long compat_sys_signalfd4(int ufd,
1731 const compat_sigset_t __user *sigmask,
1732 compat_size_t sigsetsize, int flags)
1733{
1734 compat_sigset_t ss32;
1735 sigset_t tmp;
1736 sigset_t __user *ksigmask;
1737
1738 if (sigsetsize != sizeof(compat_sigset_t))
1739 return -EINVAL;
1740 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1741 return -EFAULT;
1742 sigset_from_compat(&tmp, &ss32);
1743 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1744 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1745 return -EFAULT;
1746
1747 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
1748}
1749
1750asmlinkage long compat_sys_signalfd(int ufd,
1751 const compat_sigset_t __user *sigmask,
1752 compat_size_t sigsetsize)
1753{
1754 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1755}
1756#endif /* CONFIG_SIGNALFD */
1757
1758#ifdef CONFIG_TIMERFD
1759
1760asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1761 const struct compat_itimerspec __user *utmr,
1762 struct compat_itimerspec __user *otmr)
1763{
1764 int error;
1765 struct itimerspec t;
1766 struct itimerspec __user *ut;
1767
1768 if (get_compat_itimerspec(&t, utmr))
1769 return -EFAULT;
1770 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1771 if (copy_to_user(&ut[0], &t, sizeof(t)))
1772 return -EFAULT;
1773 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1774 if (!error && otmr)
1775 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1776 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1777
1778 return error;
1779}
1780
1781asmlinkage long compat_sys_timerfd_gettime(int ufd,
1782 struct compat_itimerspec __user *otmr)
1783{
1784 int error;
1785 struct itimerspec t;
1786 struct itimerspec __user *ut;
1787
1788 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1789 error = sys_timerfd_gettime(ufd, ut);
1790 if (!error)
1791 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1792 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1793
1794 return error;
1795}
1796
1797#endif /* CONFIG_TIMERFD */
1798
1799#ifdef CONFIG_FHANDLE
1800/*
1801 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1802 * doesn't set the O_LARGEFILE flag.
1803 */
1804asmlinkage long
1805compat_sys_open_by_handle_at(int mountdirfd,
1806 struct file_handle __user *handle, int flags)
1807{
1808 return do_handle_open(mountdirfd, handle, flags);
1809}
1810#endif