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[mirror_ubuntu-bionic-kernel.git] / fs / compat.c
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/stddef.h>
19 #include <linux/kernel.h>
20 #include <linux/linkage.h>
21 #include <linux/compat.h>
22 #include <linux/errno.h>
23 #include <linux/time.h>
24 #include <linux/fs.h>
25 #include <linux/fcntl.h>
26 #include <linux/namei.h>
27 #include <linux/file.h>
28 #include <linux/fdtable.h>
29 #include <linux/vfs.h>
30 #include <linux/ioctl.h>
31 #include <linux/init.h>
32 #include <linux/ncp_mount.h>
33 #include <linux/nfs4_mount.h>
34 #include <linux/syscalls.h>
35 #include <linux/ctype.h>
36 #include <linux/module.h>
37 #include <linux/dirent.h>
38 #include <linux/fsnotify.h>
39 #include <linux/highuid.h>
40 #include <linux/personality.h>
41 #include <linux/rwsem.h>
42 #include <linux/tsacct_kern.h>
43 #include <linux/security.h>
44 #include <linux/highmem.h>
45 #include <linux/signal.h>
46 #include <linux/poll.h>
47 #include <linux/mm.h>
48 #include <linux/eventpoll.h>
49 #include <linux/fs_struct.h>
50 #include <linux/slab.h>
51 #include <linux/pagemap.h>
52
53 #include <asm/uaccess.h>
54 #include <asm/mmu_context.h>
55 #include <asm/ioctls.h>
56 #include "internal.h"
57
58 int compat_log = 1;
59
60 int compat_printk(const char *fmt, ...)
61 {
62 va_list ap;
63 int ret;
64 if (!compat_log)
65 return 0;
66 va_start(ap, fmt);
67 ret = vprintk(fmt, ap);
68 va_end(ap);
69 return ret;
70 }
71
72 #include "read_write.h"
73
74 /*
75 * Not all architectures have sys_utime, so implement this in terms
76 * of sys_utimes.
77 */
78 asmlinkage long compat_sys_utime(const char __user *filename,
79 struct compat_utimbuf __user *t)
80 {
81 struct timespec tv[2];
82
83 if (t) {
84 if (get_user(tv[0].tv_sec, &t->actime) ||
85 get_user(tv[1].tv_sec, &t->modtime))
86 return -EFAULT;
87 tv[0].tv_nsec = 0;
88 tv[1].tv_nsec = 0;
89 }
90 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
91 }
92
93 asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
94 {
95 struct timespec tv[2];
96
97 if (t) {
98 if (get_compat_timespec(&tv[0], &t[0]) ||
99 get_compat_timespec(&tv[1], &t[1]))
100 return -EFAULT;
101
102 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
103 return 0;
104 }
105 return do_utimes(dfd, filename, t ? tv : NULL, flags);
106 }
107
108 asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
109 {
110 struct timespec tv[2];
111
112 if (t) {
113 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
114 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
115 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
116 get_user(tv[1].tv_nsec, &t[1].tv_usec))
117 return -EFAULT;
118 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
119 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
120 return -EINVAL;
121 tv[0].tv_nsec *= 1000;
122 tv[1].tv_nsec *= 1000;
123 }
124 return do_utimes(dfd, filename, t ? tv : NULL, 0);
125 }
126
127 asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
128 {
129 return compat_sys_futimesat(AT_FDCWD, filename, t);
130 }
131
132 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
133 {
134 compat_ino_t ino = stat->ino;
135 typeof(ubuf->st_uid) uid = 0;
136 typeof(ubuf->st_gid) gid = 0;
137 int err;
138
139 SET_UID(uid, stat->uid);
140 SET_GID(gid, stat->gid);
141
142 if ((u64) stat->size > MAX_NON_LFS ||
143 !old_valid_dev(stat->dev) ||
144 !old_valid_dev(stat->rdev))
145 return -EOVERFLOW;
146 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
147 return -EOVERFLOW;
148
149 if (clear_user(ubuf, sizeof(*ubuf)))
150 return -EFAULT;
151
152 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
153 err |= __put_user(ino, &ubuf->st_ino);
154 err |= __put_user(stat->mode, &ubuf->st_mode);
155 err |= __put_user(stat->nlink, &ubuf->st_nlink);
156 err |= __put_user(uid, &ubuf->st_uid);
157 err |= __put_user(gid, &ubuf->st_gid);
158 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
159 err |= __put_user(stat->size, &ubuf->st_size);
160 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
161 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
162 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
163 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
164 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
165 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
166 err |= __put_user(stat->blksize, &ubuf->st_blksize);
167 err |= __put_user(stat->blocks, &ubuf->st_blocks);
168 return err;
169 }
170
171 asmlinkage long compat_sys_newstat(const char __user * filename,
172 struct compat_stat __user *statbuf)
173 {
174 struct kstat stat;
175 int error;
176
177 error = vfs_stat(filename, &stat);
178 if (error)
179 return error;
180 return cp_compat_stat(&stat, statbuf);
181 }
182
183 asmlinkage long compat_sys_newlstat(const char __user * filename,
184 struct compat_stat __user *statbuf)
185 {
186 struct kstat stat;
187 int error;
188
189 error = vfs_lstat(filename, &stat);
190 if (error)
191 return error;
192 return cp_compat_stat(&stat, statbuf);
193 }
194
195 #ifndef __ARCH_WANT_STAT64
196 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
197 const char __user *filename,
198 struct compat_stat __user *statbuf, int flag)
199 {
200 struct kstat stat;
201 int error;
202
203 error = vfs_fstatat(dfd, filename, &stat, flag);
204 if (error)
205 return error;
206 return cp_compat_stat(&stat, statbuf);
207 }
208 #endif
209
210 asmlinkage long compat_sys_newfstat(unsigned int fd,
211 struct compat_stat __user * statbuf)
212 {
213 struct kstat stat;
214 int error = vfs_fstat(fd, &stat);
215
216 if (!error)
217 error = cp_compat_stat(&stat, statbuf);
218 return error;
219 }
220
221 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
222 {
223
224 if (sizeof ubuf->f_blocks == 4) {
225 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
226 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
227 return -EOVERFLOW;
228 /* f_files and f_ffree may be -1; it's okay
229 * to stuff that into 32 bits */
230 if (kbuf->f_files != 0xffffffffffffffffULL
231 && (kbuf->f_files & 0xffffffff00000000ULL))
232 return -EOVERFLOW;
233 if (kbuf->f_ffree != 0xffffffffffffffffULL
234 && (kbuf->f_ffree & 0xffffffff00000000ULL))
235 return -EOVERFLOW;
236 }
237 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
238 __put_user(kbuf->f_type, &ubuf->f_type) ||
239 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
240 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
241 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
242 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
243 __put_user(kbuf->f_files, &ubuf->f_files) ||
244 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
245 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
246 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
247 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
248 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
249 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
250 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
251 return -EFAULT;
252 return 0;
253 }
254
255 /*
256 * The following statfs calls are copies of code from fs/statfs.c and
257 * should be checked against those from time to time
258 */
259 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
260 {
261 struct kstatfs tmp;
262 int error = user_statfs(pathname, &tmp);
263 if (!error)
264 error = put_compat_statfs(buf, &tmp);
265 return error;
266 }
267
268 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
269 {
270 struct kstatfs tmp;
271 int error = fd_statfs(fd, &tmp);
272 if (!error)
273 error = put_compat_statfs(buf, &tmp);
274 return error;
275 }
276
277 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
278 {
279 if (sizeof ubuf->f_blocks == 4) {
280 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
281 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
282 return -EOVERFLOW;
283 /* f_files and f_ffree may be -1; it's okay
284 * to stuff that into 32 bits */
285 if (kbuf->f_files != 0xffffffffffffffffULL
286 && (kbuf->f_files & 0xffffffff00000000ULL))
287 return -EOVERFLOW;
288 if (kbuf->f_ffree != 0xffffffffffffffffULL
289 && (kbuf->f_ffree & 0xffffffff00000000ULL))
290 return -EOVERFLOW;
291 }
292 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
293 __put_user(kbuf->f_type, &ubuf->f_type) ||
294 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
295 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
296 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
297 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
298 __put_user(kbuf->f_files, &ubuf->f_files) ||
299 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
300 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
301 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
302 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
303 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
304 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
305 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
306 return -EFAULT;
307 return 0;
308 }
309
310 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
311 {
312 struct kstatfs tmp;
313 int error;
314
315 if (sz != sizeof(*buf))
316 return -EINVAL;
317
318 error = user_statfs(pathname, &tmp);
319 if (!error)
320 error = put_compat_statfs64(buf, &tmp);
321 return error;
322 }
323
324 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
325 {
326 struct kstatfs tmp;
327 int error;
328
329 if (sz != sizeof(*buf))
330 return -EINVAL;
331
332 error = fd_statfs(fd, &tmp);
333 if (!error)
334 error = put_compat_statfs64(buf, &tmp);
335 return error;
336 }
337
338 /*
339 * This is a copy of sys_ustat, just dealing with a structure layout.
340 * Given how simple this syscall is that apporach is more maintainable
341 * than the various conversion hacks.
342 */
343 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
344 {
345 struct super_block *sb;
346 struct compat_ustat tmp;
347 struct kstatfs sbuf;
348 int err;
349
350 sb = user_get_super(new_decode_dev(dev));
351 if (!sb)
352 return -EINVAL;
353 err = statfs_by_dentry(sb->s_root, &sbuf);
354 drop_super(sb);
355 if (err)
356 return err;
357
358 memset(&tmp, 0, sizeof(struct compat_ustat));
359 tmp.f_tfree = sbuf.f_bfree;
360 tmp.f_tinode = sbuf.f_ffree;
361 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
362 return -EFAULT;
363 return 0;
364 }
365
366 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
367 {
368 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
369 __get_user(kfl->l_type, &ufl->l_type) ||
370 __get_user(kfl->l_whence, &ufl->l_whence) ||
371 __get_user(kfl->l_start, &ufl->l_start) ||
372 __get_user(kfl->l_len, &ufl->l_len) ||
373 __get_user(kfl->l_pid, &ufl->l_pid))
374 return -EFAULT;
375 return 0;
376 }
377
378 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
379 {
380 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
381 __put_user(kfl->l_type, &ufl->l_type) ||
382 __put_user(kfl->l_whence, &ufl->l_whence) ||
383 __put_user(kfl->l_start, &ufl->l_start) ||
384 __put_user(kfl->l_len, &ufl->l_len) ||
385 __put_user(kfl->l_pid, &ufl->l_pid))
386 return -EFAULT;
387 return 0;
388 }
389
390 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
391 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
392 {
393 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
394 __get_user(kfl->l_type, &ufl->l_type) ||
395 __get_user(kfl->l_whence, &ufl->l_whence) ||
396 __get_user(kfl->l_start, &ufl->l_start) ||
397 __get_user(kfl->l_len, &ufl->l_len) ||
398 __get_user(kfl->l_pid, &ufl->l_pid))
399 return -EFAULT;
400 return 0;
401 }
402 #endif
403
404 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
405 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
406 {
407 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
408 __put_user(kfl->l_type, &ufl->l_type) ||
409 __put_user(kfl->l_whence, &ufl->l_whence) ||
410 __put_user(kfl->l_start, &ufl->l_start) ||
411 __put_user(kfl->l_len, &ufl->l_len) ||
412 __put_user(kfl->l_pid, &ufl->l_pid))
413 return -EFAULT;
414 return 0;
415 }
416 #endif
417
418 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
419 unsigned long arg)
420 {
421 mm_segment_t old_fs;
422 struct flock f;
423 long ret;
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 ret = get_compat_flock64(&f, compat_ptr(arg));
461 if (ret != 0)
462 break;
463 old_fs = get_fs();
464 set_fs(KERNEL_DS);
465 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
466 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
467 (unsigned long)&f);
468 set_fs(old_fs);
469 if (cmd == F_GETLK64 && ret == 0) {
470 /* need to return lock information - see above for commentary */
471 if (f.l_start > COMPAT_LOFF_T_MAX)
472 ret = -EOVERFLOW;
473 if (f.l_len > COMPAT_LOFF_T_MAX)
474 f.l_len = COMPAT_LOFF_T_MAX;
475 if (ret == 0)
476 ret = put_compat_flock64(&f, compat_ptr(arg));
477 }
478 break;
479
480 default:
481 ret = sys_fcntl(fd, cmd, arg);
482 break;
483 }
484 return ret;
485 }
486
487 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
488 unsigned long arg)
489 {
490 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
491 return -EINVAL;
492 return compat_sys_fcntl64(fd, cmd, arg);
493 }
494
495 asmlinkage long
496 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
497 {
498 long ret;
499 aio_context_t ctx64;
500
501 mm_segment_t oldfs = get_fs();
502 if (unlikely(get_user(ctx64, ctx32p)))
503 return -EFAULT;
504
505 set_fs(KERNEL_DS);
506 /* The __user pointer cast is valid because of the set_fs() */
507 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
508 set_fs(oldfs);
509 /* truncating is ok because it's a user address */
510 if (!ret)
511 ret = put_user((u32) ctx64, ctx32p);
512 return ret;
513 }
514
515 asmlinkage long
516 compat_sys_io_getevents(aio_context_t ctx_id,
517 unsigned long min_nr,
518 unsigned long nr,
519 struct io_event __user *events,
520 struct compat_timespec __user *timeout)
521 {
522 long ret;
523 struct timespec t;
524 struct timespec __user *ut = NULL;
525
526 ret = -EFAULT;
527 if (unlikely(!access_ok(VERIFY_WRITE, events,
528 nr * sizeof(struct io_event))))
529 goto out;
530 if (timeout) {
531 if (get_compat_timespec(&t, timeout))
532 goto out;
533
534 ut = compat_alloc_user_space(sizeof(*ut));
535 if (copy_to_user(ut, &t, sizeof(t)) )
536 goto out;
537 }
538 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
539 out:
540 return ret;
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
546 ssize_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 /*
576 * Single unix specification:
577 * We should -EINVAL if an element length is not >= 0 and fitting an
578 * ssize_t.
579 *
580 * In Linux, the total length is limited to MAX_RW_COUNT, there is
581 * no overflow possibility.
582 */
583 tot_len = 0;
584 ret = -EINVAL;
585 for (seg = 0; seg < nr_segs; seg++) {
586 compat_uptr_t buf;
587 compat_ssize_t len;
588
589 if (__get_user(len, &uvector->iov_len) ||
590 __get_user(buf, &uvector->iov_base)) {
591 ret = -EFAULT;
592 goto out;
593 }
594 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
595 goto out;
596 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
597 ret = -EFAULT;
598 goto out;
599 }
600 if (len > MAX_RW_COUNT - tot_len)
601 len = MAX_RW_COUNT - tot_len;
602 tot_len += len;
603 iov->iov_base = compat_ptr(buf);
604 iov->iov_len = (compat_size_t) len;
605 uvector++;
606 iov++;
607 }
608 ret = tot_len;
609
610 out:
611 return ret;
612 }
613
614 static inline long
615 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
616 {
617 compat_uptr_t uptr;
618 int i;
619
620 for (i = 0; i < nr; ++i) {
621 if (get_user(uptr, ptr32 + i))
622 return -EFAULT;
623 if (put_user(compat_ptr(uptr), ptr64 + i))
624 return -EFAULT;
625 }
626 return 0;
627 }
628
629 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
630
631 asmlinkage long
632 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
633 {
634 struct iocb __user * __user *iocb64;
635 long ret;
636
637 if (unlikely(nr < 0))
638 return -EINVAL;
639
640 if (nr > MAX_AIO_SUBMITS)
641 nr = MAX_AIO_SUBMITS;
642
643 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
644 ret = copy_iocb(nr, iocb, iocb64);
645 if (!ret)
646 ret = do_io_submit(ctx_id, nr, iocb64, 1);
647 return ret;
648 }
649
650 struct compat_ncp_mount_data {
651 compat_int_t version;
652 compat_uint_t ncp_fd;
653 __compat_uid_t mounted_uid;
654 compat_pid_t wdog_pid;
655 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
656 compat_uint_t time_out;
657 compat_uint_t retry_count;
658 compat_uint_t flags;
659 __compat_uid_t uid;
660 __compat_gid_t gid;
661 compat_mode_t file_mode;
662 compat_mode_t dir_mode;
663 };
664
665 struct compat_ncp_mount_data_v4 {
666 compat_int_t version;
667 compat_ulong_t flags;
668 compat_ulong_t mounted_uid;
669 compat_long_t wdog_pid;
670 compat_uint_t ncp_fd;
671 compat_uint_t time_out;
672 compat_uint_t retry_count;
673 compat_ulong_t uid;
674 compat_ulong_t gid;
675 compat_ulong_t file_mode;
676 compat_ulong_t dir_mode;
677 };
678
679 static void *do_ncp_super_data_conv(void *raw_data)
680 {
681 int version = *(unsigned int *)raw_data;
682
683 if (version == 3) {
684 struct compat_ncp_mount_data *c_n = raw_data;
685 struct ncp_mount_data *n = raw_data;
686
687 n->dir_mode = c_n->dir_mode;
688 n->file_mode = c_n->file_mode;
689 n->gid = c_n->gid;
690 n->uid = c_n->uid;
691 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
692 n->wdog_pid = c_n->wdog_pid;
693 n->mounted_uid = c_n->mounted_uid;
694 } else if (version == 4) {
695 struct compat_ncp_mount_data_v4 *c_n = raw_data;
696 struct ncp_mount_data_v4 *n = raw_data;
697
698 n->dir_mode = c_n->dir_mode;
699 n->file_mode = c_n->file_mode;
700 n->gid = c_n->gid;
701 n->uid = c_n->uid;
702 n->retry_count = c_n->retry_count;
703 n->time_out = c_n->time_out;
704 n->ncp_fd = c_n->ncp_fd;
705 n->wdog_pid = c_n->wdog_pid;
706 n->mounted_uid = c_n->mounted_uid;
707 n->flags = c_n->flags;
708 } else if (version != 5) {
709 return NULL;
710 }
711
712 return raw_data;
713 }
714
715
716 struct compat_nfs_string {
717 compat_uint_t len;
718 compat_uptr_t data;
719 };
720
721 static inline void compat_nfs_string(struct nfs_string *dst,
722 struct compat_nfs_string *src)
723 {
724 dst->data = compat_ptr(src->data);
725 dst->len = src->len;
726 }
727
728 struct compat_nfs4_mount_data_v1 {
729 compat_int_t version;
730 compat_int_t flags;
731 compat_int_t rsize;
732 compat_int_t wsize;
733 compat_int_t timeo;
734 compat_int_t retrans;
735 compat_int_t acregmin;
736 compat_int_t acregmax;
737 compat_int_t acdirmin;
738 compat_int_t acdirmax;
739 struct compat_nfs_string client_addr;
740 struct compat_nfs_string mnt_path;
741 struct compat_nfs_string hostname;
742 compat_uint_t host_addrlen;
743 compat_uptr_t host_addr;
744 compat_int_t proto;
745 compat_int_t auth_flavourlen;
746 compat_uptr_t auth_flavours;
747 };
748
749 static int do_nfs4_super_data_conv(void *raw_data)
750 {
751 int version = *(compat_uint_t *) raw_data;
752
753 if (version == 1) {
754 struct compat_nfs4_mount_data_v1 *raw = raw_data;
755 struct nfs4_mount_data *real = raw_data;
756
757 /* copy the fields backwards */
758 real->auth_flavours = compat_ptr(raw->auth_flavours);
759 real->auth_flavourlen = raw->auth_flavourlen;
760 real->proto = raw->proto;
761 real->host_addr = compat_ptr(raw->host_addr);
762 real->host_addrlen = raw->host_addrlen;
763 compat_nfs_string(&real->hostname, &raw->hostname);
764 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
765 compat_nfs_string(&real->client_addr, &raw->client_addr);
766 real->acdirmax = raw->acdirmax;
767 real->acdirmin = raw->acdirmin;
768 real->acregmax = raw->acregmax;
769 real->acregmin = raw->acregmin;
770 real->retrans = raw->retrans;
771 real->timeo = raw->timeo;
772 real->wsize = raw->wsize;
773 real->rsize = raw->rsize;
774 real->flags = raw->flags;
775 real->version = raw->version;
776 }
777
778 return 0;
779 }
780
781 #define NCPFS_NAME "ncpfs"
782 #define NFS4_NAME "nfs4"
783
784 asmlinkage long compat_sys_mount(const char __user * dev_name,
785 const char __user * dir_name,
786 const char __user * type, unsigned long flags,
787 const void __user * data)
788 {
789 char *kernel_type;
790 unsigned long data_page;
791 char *kernel_dev;
792 char *dir_page;
793 int retval;
794
795 retval = copy_mount_string(type, &kernel_type);
796 if (retval < 0)
797 goto out;
798
799 dir_page = getname(dir_name);
800 retval = PTR_ERR(dir_page);
801 if (IS_ERR(dir_page))
802 goto out1;
803
804 retval = copy_mount_string(dev_name, &kernel_dev);
805 if (retval < 0)
806 goto out2;
807
808 retval = copy_mount_options(data, &data_page);
809 if (retval < 0)
810 goto out3;
811
812 retval = -EINVAL;
813
814 if (kernel_type && data_page) {
815 if (!strcmp(kernel_type, NCPFS_NAME)) {
816 do_ncp_super_data_conv((void *)data_page);
817 } else if (!strcmp(kernel_type, NFS4_NAME)) {
818 if (do_nfs4_super_data_conv((void *) data_page))
819 goto out4;
820 }
821 }
822
823 retval = do_mount(kernel_dev, dir_page, kernel_type,
824 flags, (void*)data_page);
825
826 out4:
827 free_page(data_page);
828 out3:
829 kfree(kernel_dev);
830 out2:
831 putname(dir_page);
832 out1:
833 kfree(kernel_type);
834 out:
835 return retval;
836 }
837
838 struct compat_old_linux_dirent {
839 compat_ulong_t d_ino;
840 compat_ulong_t d_offset;
841 unsigned short d_namlen;
842 char d_name[1];
843 };
844
845 struct compat_readdir_callback {
846 struct compat_old_linux_dirent __user *dirent;
847 int result;
848 };
849
850 static int compat_fillonedir(void *__buf, const char *name, int namlen,
851 loff_t offset, u64 ino, unsigned int d_type)
852 {
853 struct compat_readdir_callback *buf = __buf;
854 struct compat_old_linux_dirent __user *dirent;
855 compat_ulong_t d_ino;
856
857 if (buf->result)
858 return -EINVAL;
859 d_ino = ino;
860 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
861 buf->result = -EOVERFLOW;
862 return -EOVERFLOW;
863 }
864 buf->result++;
865 dirent = buf->dirent;
866 if (!access_ok(VERIFY_WRITE, dirent,
867 (unsigned long)(dirent->d_name + namlen + 1) -
868 (unsigned long)dirent))
869 goto efault;
870 if ( __put_user(d_ino, &dirent->d_ino) ||
871 __put_user(offset, &dirent->d_offset) ||
872 __put_user(namlen, &dirent->d_namlen) ||
873 __copy_to_user(dirent->d_name, name, namlen) ||
874 __put_user(0, dirent->d_name + namlen))
875 goto efault;
876 return 0;
877 efault:
878 buf->result = -EFAULT;
879 return -EFAULT;
880 }
881
882 asmlinkage long compat_sys_old_readdir(unsigned int fd,
883 struct compat_old_linux_dirent __user *dirent, unsigned int count)
884 {
885 int error;
886 struct file *file;
887 struct compat_readdir_callback buf;
888
889 error = -EBADF;
890 file = fget(fd);
891 if (!file)
892 goto out;
893
894 buf.result = 0;
895 buf.dirent = dirent;
896
897 error = vfs_readdir(file, compat_fillonedir, &buf);
898 if (buf.result)
899 error = buf.result;
900
901 fput(file);
902 out:
903 return error;
904 }
905
906 struct compat_linux_dirent {
907 compat_ulong_t d_ino;
908 compat_ulong_t d_off;
909 unsigned short d_reclen;
910 char d_name[1];
911 };
912
913 struct compat_getdents_callback {
914 struct compat_linux_dirent __user *current_dir;
915 struct compat_linux_dirent __user *previous;
916 int count;
917 int error;
918 };
919
920 static int compat_filldir(void *__buf, const char *name, int namlen,
921 loff_t offset, u64 ino, unsigned int d_type)
922 {
923 struct compat_linux_dirent __user * dirent;
924 struct compat_getdents_callback *buf = __buf;
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;
958 efault:
959 buf->error = -EFAULT;
960 return -EFAULT;
961 }
962
963 asmlinkage long compat_sys_getdents(unsigned int fd,
964 struct compat_linux_dirent __user *dirent, unsigned int count)
965 {
966 struct file * file;
967 struct compat_linux_dirent __user * lastdirent;
968 struct compat_getdents_callback buf;
969 int error;
970
971 error = -EFAULT;
972 if (!access_ok(VERIFY_WRITE, dirent, count))
973 goto out;
974
975 error = -EBADF;
976 file = fget(fd);
977 if (!file)
978 goto out;
979
980 buf.current_dir = dirent;
981 buf.previous = NULL;
982 buf.count = count;
983 buf.error = 0;
984
985 error = vfs_readdir(file, compat_filldir, &buf);
986 if (error >= 0)
987 error = buf.error;
988 lastdirent = buf.previous;
989 if (lastdirent) {
990 if (put_user(file->f_pos, &lastdirent->d_off))
991 error = -EFAULT;
992 else
993 error = count - buf.count;
994 }
995 fput(file);
996 out:
997 return error;
998 }
999
1000 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1001
1002 struct compat_getdents_callback64 {
1003 struct linux_dirent64 __user *current_dir;
1004 struct linux_dirent64 __user *previous;
1005 int count;
1006 int error;
1007 };
1008
1009 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1010 u64 ino, unsigned int d_type)
1011 {
1012 struct linux_dirent64 __user *dirent;
1013 struct compat_getdents_callback64 *buf = __buf;
1014 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1015 sizeof(u64));
1016 u64 off;
1017
1018 buf->error = -EINVAL; /* only used if we fail.. */
1019 if (reclen > buf->count)
1020 return -EINVAL;
1021 dirent = buf->previous;
1022
1023 if (dirent) {
1024 if (__put_user_unaligned(offset, &dirent->d_off))
1025 goto efault;
1026 }
1027 dirent = buf->current_dir;
1028 if (__put_user_unaligned(ino, &dirent->d_ino))
1029 goto efault;
1030 off = 0;
1031 if (__put_user_unaligned(off, &dirent->d_off))
1032 goto efault;
1033 if (__put_user(reclen, &dirent->d_reclen))
1034 goto efault;
1035 if (__put_user(d_type, &dirent->d_type))
1036 goto efault;
1037 if (copy_to_user(dirent->d_name, name, namlen))
1038 goto efault;
1039 if (__put_user(0, dirent->d_name + namlen))
1040 goto efault;
1041 buf->previous = dirent;
1042 dirent = (void __user *)dirent + reclen;
1043 buf->current_dir = dirent;
1044 buf->count -= reclen;
1045 return 0;
1046 efault:
1047 buf->error = -EFAULT;
1048 return -EFAULT;
1049 }
1050
1051 asmlinkage long compat_sys_getdents64(unsigned int fd,
1052 struct linux_dirent64 __user * dirent, unsigned int count)
1053 {
1054 struct file * file;
1055 struct linux_dirent64 __user * lastdirent;
1056 struct compat_getdents_callback64 buf;
1057 int error;
1058
1059 error = -EFAULT;
1060 if (!access_ok(VERIFY_WRITE, dirent, count))
1061 goto out;
1062
1063 error = -EBADF;
1064 file = fget(fd);
1065 if (!file)
1066 goto out;
1067
1068 buf.current_dir = dirent;
1069 buf.previous = NULL;
1070 buf.count = count;
1071 buf.error = 0;
1072
1073 error = vfs_readdir(file, compat_filldir64, &buf);
1074 if (error >= 0)
1075 error = buf.error;
1076 lastdirent = buf.previous;
1077 if (lastdirent) {
1078 typeof(lastdirent->d_off) d_off = file->f_pos;
1079 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1080 error = -EFAULT;
1081 else
1082 error = count - buf.count;
1083 }
1084 fput(file);
1085 out:
1086 return error;
1087 }
1088 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1089
1090 static ssize_t compat_do_readv_writev(int type, struct file *file,
1091 const struct compat_iovec __user *uvector,
1092 unsigned long nr_segs, loff_t *pos)
1093 {
1094 compat_ssize_t tot_len;
1095 struct iovec iovstack[UIO_FASTIOV];
1096 struct iovec *iov = iovstack;
1097 ssize_t ret;
1098 io_fn_t fn;
1099 iov_fn_t fnv;
1100
1101 ret = -EINVAL;
1102 if (!file->f_op)
1103 goto out;
1104
1105 ret = -EFAULT;
1106 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1107 goto out;
1108
1109 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1110 UIO_FASTIOV, iovstack, &iov);
1111 if (tot_len == 0) {
1112 ret = 0;
1113 goto out;
1114 }
1115
1116 ret = rw_verify_area(type, file, pos, tot_len);
1117 if (ret < 0)
1118 goto out;
1119
1120 fnv = NULL;
1121 if (type == READ) {
1122 fn = file->f_op->read;
1123 fnv = file->f_op->aio_read;
1124 } else {
1125 fn = (io_fn_t)file->f_op->write;
1126 fnv = file->f_op->aio_write;
1127 }
1128
1129 if (fnv)
1130 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1131 pos, fnv);
1132 else
1133 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1134
1135 out:
1136 if (iov != iovstack)
1137 kfree(iov);
1138 if ((ret + (type == READ)) > 0) {
1139 if (type == READ)
1140 fsnotify_access(file);
1141 else
1142 fsnotify_modify(file);
1143 }
1144 return ret;
1145 }
1146
1147 static size_t compat_readv(struct file *file,
1148 const struct compat_iovec __user *vec,
1149 unsigned long vlen, loff_t *pos)
1150 {
1151 ssize_t ret = -EBADF;
1152
1153 if (!(file->f_mode & FMODE_READ))
1154 goto out;
1155
1156 ret = -EINVAL;
1157 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1158 goto out;
1159
1160 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1161
1162 out:
1163 if (ret > 0)
1164 add_rchar(current, ret);
1165 inc_syscr(current);
1166 return ret;
1167 }
1168
1169 asmlinkage ssize_t
1170 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1171 unsigned long vlen)
1172 {
1173 struct file *file;
1174 int fput_needed;
1175 ssize_t ret;
1176
1177 file = fget_light(fd, &fput_needed);
1178 if (!file)
1179 return -EBADF;
1180 ret = compat_readv(file, vec, vlen, &file->f_pos);
1181 fput_light(file, fput_needed);
1182 return ret;
1183 }
1184
1185 asmlinkage ssize_t
1186 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1187 unsigned long vlen, u32 pos_low, u32 pos_high)
1188 {
1189 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1190 struct file *file;
1191 int fput_needed;
1192 ssize_t ret;
1193
1194 if (pos < 0)
1195 return -EINVAL;
1196 file = fget_light(fd, &fput_needed);
1197 if (!file)
1198 return -EBADF;
1199 ret = -ESPIPE;
1200 if (file->f_mode & FMODE_PREAD)
1201 ret = compat_readv(file, vec, vlen, &pos);
1202 fput_light(file, fput_needed);
1203 return ret;
1204 }
1205
1206 static size_t compat_writev(struct file *file,
1207 const struct compat_iovec __user *vec,
1208 unsigned long vlen, loff_t *pos)
1209 {
1210 ssize_t ret = -EBADF;
1211
1212 if (!(file->f_mode & FMODE_WRITE))
1213 goto out;
1214
1215 ret = -EINVAL;
1216 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1217 goto out;
1218
1219 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1220
1221 out:
1222 if (ret > 0)
1223 add_wchar(current, ret);
1224 inc_syscw(current);
1225 return ret;
1226 }
1227
1228 asmlinkage ssize_t
1229 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1230 unsigned long vlen)
1231 {
1232 struct file *file;
1233 int fput_needed;
1234 ssize_t ret;
1235
1236 file = fget_light(fd, &fput_needed);
1237 if (!file)
1238 return -EBADF;
1239 ret = compat_writev(file, vec, vlen, &file->f_pos);
1240 fput_light(file, fput_needed);
1241 return ret;
1242 }
1243
1244 asmlinkage ssize_t
1245 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1246 unsigned long vlen, u32 pos_low, u32 pos_high)
1247 {
1248 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1249 struct file *file;
1250 int fput_needed;
1251 ssize_t ret;
1252
1253 if (pos < 0)
1254 return -EINVAL;
1255 file = fget_light(fd, &fput_needed);
1256 if (!file)
1257 return -EBADF;
1258 ret = -ESPIPE;
1259 if (file->f_mode & FMODE_PWRITE)
1260 ret = compat_writev(file, vec, vlen, &pos);
1261 fput_light(file, fput_needed);
1262 return ret;
1263 }
1264
1265 asmlinkage long
1266 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1267 unsigned int nr_segs, unsigned int flags)
1268 {
1269 unsigned i;
1270 struct iovec __user *iov;
1271 if (nr_segs > UIO_MAXIOV)
1272 return -EINVAL;
1273 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1274 for (i = 0; i < nr_segs; i++) {
1275 struct compat_iovec v;
1276 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1277 get_user(v.iov_len, &iov32[i].iov_len) ||
1278 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1279 put_user(v.iov_len, &iov[i].iov_len))
1280 return -EFAULT;
1281 }
1282 return sys_vmsplice(fd, iov, nr_segs, flags);
1283 }
1284
1285 /*
1286 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1287 * O_LARGEFILE flag.
1288 */
1289 asmlinkage long
1290 compat_sys_open(const char __user *filename, int flags, int mode)
1291 {
1292 return do_sys_open(AT_FDCWD, filename, flags, mode);
1293 }
1294
1295 /*
1296 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1297 * O_LARGEFILE flag.
1298 */
1299 asmlinkage long
1300 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1301 {
1302 return do_sys_open(dfd, filename, flags, mode);
1303 }
1304
1305 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1306
1307 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1308 int timeval, int ret)
1309 {
1310 struct timespec ts;
1311
1312 if (!p)
1313 return ret;
1314
1315 if (current->personality & STICKY_TIMEOUTS)
1316 goto sticky;
1317
1318 /* No update for zero timeout */
1319 if (!end_time->tv_sec && !end_time->tv_nsec)
1320 return ret;
1321
1322 ktime_get_ts(&ts);
1323 ts = timespec_sub(*end_time, ts);
1324 if (ts.tv_sec < 0)
1325 ts.tv_sec = ts.tv_nsec = 0;
1326
1327 if (timeval) {
1328 struct compat_timeval rtv;
1329
1330 rtv.tv_sec = ts.tv_sec;
1331 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1332
1333 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1334 return ret;
1335 } else {
1336 struct compat_timespec rts;
1337
1338 rts.tv_sec = ts.tv_sec;
1339 rts.tv_nsec = ts.tv_nsec;
1340
1341 if (!copy_to_user(p, &rts, sizeof(rts)))
1342 return ret;
1343 }
1344 /*
1345 * If an application puts its timeval in read-only memory, we
1346 * don't want the Linux-specific update to the timeval to
1347 * cause a fault after the select has completed
1348 * successfully. However, because we're not updating the
1349 * timeval, we can't restart the system call.
1350 */
1351
1352 sticky:
1353 if (ret == -ERESTARTNOHAND)
1354 ret = -EINTR;
1355 return ret;
1356 }
1357
1358 /*
1359 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1360 * 64-bit unsigned longs.
1361 */
1362 static
1363 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1364 unsigned long *fdset)
1365 {
1366 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1367 if (ufdset) {
1368 unsigned long odd;
1369
1370 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1371 return -EFAULT;
1372
1373 odd = nr & 1UL;
1374 nr &= ~1UL;
1375 while (nr) {
1376 unsigned long h, l;
1377 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1378 return -EFAULT;
1379 ufdset += 2;
1380 *fdset++ = h << 32 | l;
1381 nr -= 2;
1382 }
1383 if (odd && __get_user(*fdset, ufdset))
1384 return -EFAULT;
1385 } else {
1386 /* Tricky, must clear full unsigned long in the
1387 * kernel fdset at the end, this makes sure that
1388 * actually happens.
1389 */
1390 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1391 }
1392 return 0;
1393 }
1394
1395 static
1396 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1397 unsigned long *fdset)
1398 {
1399 unsigned long odd;
1400 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1401
1402 if (!ufdset)
1403 return 0;
1404
1405 odd = nr & 1UL;
1406 nr &= ~1UL;
1407 while (nr) {
1408 unsigned long h, l;
1409 l = *fdset++;
1410 h = l >> 32;
1411 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1412 return -EFAULT;
1413 ufdset += 2;
1414 nr -= 2;
1415 }
1416 if (odd && __put_user(*fdset, ufdset))
1417 return -EFAULT;
1418 return 0;
1419 }
1420
1421
1422 /*
1423 * This is a virtual copy of sys_select from fs/select.c and probably
1424 * should be compared to it from time to time
1425 */
1426
1427 /*
1428 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1429 * like to be certain this leads to no problems. So I return
1430 * EINTR just for safety.
1431 *
1432 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1433 * I'm trying ERESTARTNOHAND which restart only when you want to.
1434 */
1435 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1436 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1437 struct timespec *end_time)
1438 {
1439 fd_set_bits fds;
1440 void *bits;
1441 int size, max_fds, ret = -EINVAL;
1442 struct fdtable *fdt;
1443 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1444
1445 if (n < 0)
1446 goto out_nofds;
1447
1448 /* max_fds can increase, so grab it once to avoid race */
1449 rcu_read_lock();
1450 fdt = files_fdtable(current->files);
1451 max_fds = fdt->max_fds;
1452 rcu_read_unlock();
1453 if (n > max_fds)
1454 n = max_fds;
1455
1456 /*
1457 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1458 * since we used fdset we need to allocate memory in units of
1459 * long-words.
1460 */
1461 size = FDS_BYTES(n);
1462 bits = stack_fds;
1463 if (size > sizeof(stack_fds) / 6) {
1464 bits = kmalloc(6 * size, GFP_KERNEL);
1465 ret = -ENOMEM;
1466 if (!bits)
1467 goto out_nofds;
1468 }
1469 fds.in = (unsigned long *) bits;
1470 fds.out = (unsigned long *) (bits + size);
1471 fds.ex = (unsigned long *) (bits + 2*size);
1472 fds.res_in = (unsigned long *) (bits + 3*size);
1473 fds.res_out = (unsigned long *) (bits + 4*size);
1474 fds.res_ex = (unsigned long *) (bits + 5*size);
1475
1476 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1477 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1478 (ret = compat_get_fd_set(n, exp, fds.ex)))
1479 goto out;
1480 zero_fd_set(n, fds.res_in);
1481 zero_fd_set(n, fds.res_out);
1482 zero_fd_set(n, fds.res_ex);
1483
1484 ret = do_select(n, &fds, end_time);
1485
1486 if (ret < 0)
1487 goto out;
1488 if (!ret) {
1489 ret = -ERESTARTNOHAND;
1490 if (signal_pending(current))
1491 goto out;
1492 ret = 0;
1493 }
1494
1495 if (compat_set_fd_set(n, inp, fds.res_in) ||
1496 compat_set_fd_set(n, outp, fds.res_out) ||
1497 compat_set_fd_set(n, exp, fds.res_ex))
1498 ret = -EFAULT;
1499 out:
1500 if (bits != stack_fds)
1501 kfree(bits);
1502 out_nofds:
1503 return ret;
1504 }
1505
1506 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1507 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1508 struct compat_timeval __user *tvp)
1509 {
1510 struct timespec end_time, *to = NULL;
1511 struct compat_timeval tv;
1512 int ret;
1513
1514 if (tvp) {
1515 if (copy_from_user(&tv, tvp, sizeof(tv)))
1516 return -EFAULT;
1517
1518 to = &end_time;
1519 if (poll_select_set_timeout(to,
1520 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1521 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1522 return -EINVAL;
1523 }
1524
1525 ret = compat_core_sys_select(n, inp, outp, exp, to);
1526 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1527
1528 return ret;
1529 }
1530
1531 struct compat_sel_arg_struct {
1532 compat_ulong_t n;
1533 compat_uptr_t inp;
1534 compat_uptr_t outp;
1535 compat_uptr_t exp;
1536 compat_uptr_t tvp;
1537 };
1538
1539 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1540 {
1541 struct compat_sel_arg_struct a;
1542
1543 if (copy_from_user(&a, arg, sizeof(a)))
1544 return -EFAULT;
1545 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1546 compat_ptr(a.exp), compat_ptr(a.tvp));
1547 }
1548
1549 #ifdef HAVE_SET_RESTORE_SIGMASK
1550 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1551 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1552 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1553 compat_size_t sigsetsize)
1554 {
1555 compat_sigset_t ss32;
1556 sigset_t ksigmask, sigsaved;
1557 struct compat_timespec ts;
1558 struct timespec end_time, *to = NULL;
1559 int ret;
1560
1561 if (tsp) {
1562 if (copy_from_user(&ts, tsp, sizeof(ts)))
1563 return -EFAULT;
1564
1565 to = &end_time;
1566 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1567 return -EINVAL;
1568 }
1569
1570 if (sigmask) {
1571 if (sigsetsize != sizeof(compat_sigset_t))
1572 return -EINVAL;
1573 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1574 return -EFAULT;
1575 sigset_from_compat(&ksigmask, &ss32);
1576
1577 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1578 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1579 }
1580
1581 ret = compat_core_sys_select(n, inp, outp, exp, to);
1582 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1583
1584 if (ret == -ERESTARTNOHAND) {
1585 /*
1586 * Don't restore the signal mask yet. Let do_signal() deliver
1587 * the signal on the way back to userspace, before the signal
1588 * mask is restored.
1589 */
1590 if (sigmask) {
1591 memcpy(&current->saved_sigmask, &sigsaved,
1592 sizeof(sigsaved));
1593 set_restore_sigmask();
1594 }
1595 } else if (sigmask)
1596 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1597
1598 return ret;
1599 }
1600
1601 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1602 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1603 struct compat_timespec __user *tsp, void __user *sig)
1604 {
1605 compat_size_t sigsetsize = 0;
1606 compat_uptr_t up = 0;
1607
1608 if (sig) {
1609 if (!access_ok(VERIFY_READ, sig,
1610 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1611 __get_user(up, (compat_uptr_t __user *)sig) ||
1612 __get_user(sigsetsize,
1613 (compat_size_t __user *)(sig+sizeof(up))))
1614 return -EFAULT;
1615 }
1616 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1617 sigsetsize);
1618 }
1619
1620 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1621 unsigned int nfds, struct compat_timespec __user *tsp,
1622 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1623 {
1624 compat_sigset_t ss32;
1625 sigset_t ksigmask, sigsaved;
1626 struct compat_timespec ts;
1627 struct timespec end_time, *to = NULL;
1628 int ret;
1629
1630 if (tsp) {
1631 if (copy_from_user(&ts, tsp, sizeof(ts)))
1632 return -EFAULT;
1633
1634 to = &end_time;
1635 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1636 return -EINVAL;
1637 }
1638
1639 if (sigmask) {
1640 if (sigsetsize != sizeof(compat_sigset_t))
1641 return -EINVAL;
1642 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1643 return -EFAULT;
1644 sigset_from_compat(&ksigmask, &ss32);
1645
1646 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1647 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1648 }
1649
1650 ret = do_sys_poll(ufds, nfds, to);
1651
1652 /* We can restart this syscall, usually */
1653 if (ret == -EINTR) {
1654 /*
1655 * Don't restore the signal mask yet. Let do_signal() deliver
1656 * the signal on the way back to userspace, before the signal
1657 * mask is restored.
1658 */
1659 if (sigmask) {
1660 memcpy(&current->saved_sigmask, &sigsaved,
1661 sizeof(sigsaved));
1662 set_restore_sigmask();
1663 }
1664 ret = -ERESTARTNOHAND;
1665 } else if (sigmask)
1666 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1667
1668 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1669
1670 return ret;
1671 }
1672 #endif /* HAVE_SET_RESTORE_SIGMASK */
1673
1674 #ifdef CONFIG_EPOLL
1675
1676 #ifdef HAVE_SET_RESTORE_SIGMASK
1677 asmlinkage long compat_sys_epoll_pwait(int epfd,
1678 struct compat_epoll_event __user *events,
1679 int maxevents, int timeout,
1680 const compat_sigset_t __user *sigmask,
1681 compat_size_t sigsetsize)
1682 {
1683 long err;
1684 compat_sigset_t csigmask;
1685 sigset_t ksigmask, sigsaved;
1686
1687 /*
1688 * If the caller wants a certain signal mask to be set during the wait,
1689 * we apply it here.
1690 */
1691 if (sigmask) {
1692 if (sigsetsize != sizeof(compat_sigset_t))
1693 return -EINVAL;
1694 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1695 return -EFAULT;
1696 sigset_from_compat(&ksigmask, &csigmask);
1697 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1698 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1699 }
1700
1701 err = sys_epoll_wait(epfd, events, maxevents, timeout);
1702
1703 /*
1704 * If we changed the signal mask, we need to restore the original one.
1705 * In case we've got a signal while waiting, we do not restore the
1706 * signal mask yet, and we allow do_signal() to deliver the signal on
1707 * the way back to userspace, before the signal mask is restored.
1708 */
1709 if (sigmask) {
1710 if (err == -EINTR) {
1711 memcpy(&current->saved_sigmask, &sigsaved,
1712 sizeof(sigsaved));
1713 set_restore_sigmask();
1714 } else
1715 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1716 }
1717
1718 return err;
1719 }
1720 #endif /* HAVE_SET_RESTORE_SIGMASK */
1721
1722 #endif /* CONFIG_EPOLL */
1723
1724 #ifdef CONFIG_SIGNALFD
1725
1726 asmlinkage long compat_sys_signalfd4(int ufd,
1727 const compat_sigset_t __user *sigmask,
1728 compat_size_t sigsetsize, int flags)
1729 {
1730 compat_sigset_t ss32;
1731 sigset_t tmp;
1732 sigset_t __user *ksigmask;
1733
1734 if (sigsetsize != sizeof(compat_sigset_t))
1735 return -EINVAL;
1736 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1737 return -EFAULT;
1738 sigset_from_compat(&tmp, &ss32);
1739 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1740 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1741 return -EFAULT;
1742
1743 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
1744 }
1745
1746 asmlinkage long compat_sys_signalfd(int ufd,
1747 const compat_sigset_t __user *sigmask,
1748 compat_size_t sigsetsize)
1749 {
1750 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1751 }
1752 #endif /* CONFIG_SIGNALFD */
1753
1754 #ifdef CONFIG_TIMERFD
1755
1756 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1757 const struct compat_itimerspec __user *utmr,
1758 struct compat_itimerspec __user *otmr)
1759 {
1760 int error;
1761 struct itimerspec t;
1762 struct itimerspec __user *ut;
1763
1764 if (get_compat_itimerspec(&t, utmr))
1765 return -EFAULT;
1766 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1767 if (copy_to_user(&ut[0], &t, sizeof(t)))
1768 return -EFAULT;
1769 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1770 if (!error && otmr)
1771 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1772 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1773
1774 return error;
1775 }
1776
1777 asmlinkage long compat_sys_timerfd_gettime(int ufd,
1778 struct compat_itimerspec __user *otmr)
1779 {
1780 int error;
1781 struct itimerspec t;
1782 struct itimerspec __user *ut;
1783
1784 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1785 error = sys_timerfd_gettime(ufd, ut);
1786 if (!error)
1787 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1788 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1789
1790 return error;
1791 }
1792
1793 #endif /* CONFIG_TIMERFD */
1794
1795 #ifdef CONFIG_FHANDLE
1796 /*
1797 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1798 * doesn't set the O_LARGEFILE flag.
1799 */
1800 asmlinkage long
1801 compat_sys_open_by_handle_at(int mountdirfd,
1802 struct file_handle __user *handle, int flags)
1803 {
1804 return do_handle_open(mountdirfd, handle, flags);
1805 }
1806 #endif
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