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ARC: Delete stale barrier.h
[linux-stable.git] / fs / compat.c
blobca926ad0430cf715af12ebc3f0fa86d8c273d492
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
57 int compat_log = 1;
58
59 int 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 */
75 COMPAT_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
90 COMPAT_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
105 COMPAT_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
124 COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
125 {
126 return compat_sys_futimesat(AT_FDCWD, filename, t);
127 }
128
129 static 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
162 COMPAT_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
174 COMPAT_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
187 COMPAT_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
201 COMPAT_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
212 static 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 */
250 COMPAT_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
259 COMPAT_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
268 static 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
301 COMPAT_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
315 COMPAT_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 */
334 COMPAT_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
350 static 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
362 static 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
375 static 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
389 static 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
402 static unsigned int
403 convert_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
417 COMPAT_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_GETLKP:
461 case F_SETLKP:
462 case F_SETLKPW:
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_GETLKP) && 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
489 COMPAT_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_GETLKP:
497 case F_SETLKP:
498 case F_SETLKPW:
499 return -EINVAL;
500 }
501 return compat_sys_fcntl64(fd, cmd, arg);
502 }
503
504 COMPAT_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
523 COMPAT_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
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 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
615 out:
616 return ret;
617 }
618
619 static inline long
620 copy_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
636 COMPAT_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
655 struct 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
670 struct 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
684 static 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
721 struct compat_nfs_string {
722 compat_uint_t len;
723 compat_uptr_t data;
724 };
725
726 static 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
733 struct 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
754 static 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
789 COMPAT_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 unsigned long data_page;
796 char *kernel_dev;
797 struct filename *dir;
798 int retval;
799
800 retval = copy_mount_string(type, &kernel_type);
801 if (retval < 0)
802 goto out;
803
804 dir = getname(dir_name);
805 retval = PTR_ERR(dir);
806 if (IS_ERR(dir))
807 goto out1;
808
809 retval = copy_mount_string(dev_name, &kernel_dev);
810 if (retval < 0)
811 goto out2;
812
813 retval = copy_mount_options(data, &data_page);
814 if (retval < 0)
815 goto out3;
816
817 retval = -EINVAL;
818
819 if (kernel_type && data_page) {
820 if (!strcmp(kernel_type, NCPFS_NAME)) {
821 do_ncp_super_data_conv((void *)data_page);
822 } else if (!strcmp(kernel_type, NFS4_NAME)) {
823 if (do_nfs4_super_data_conv((void *) data_page))
824 goto out4;
825 }
826 }
827
828 retval = do_mount(kernel_dev, dir->name, kernel_type,
829 flags, (void*)data_page);
830
831 out4:
832 free_page(data_page);
833 out3:
834 kfree(kernel_dev);
835 out2:
836 putname(dir);
837 out1:
838 kfree(kernel_type);
839 out:
840 return retval;
841 }
842
843 struct compat_old_linux_dirent {
844 compat_ulong_t d_ino;
845 compat_ulong_t d_offset;
846 unsigned short d_namlen;
847 char d_name[1];
848 };
849
850 struct compat_readdir_callback {
851 struct dir_context ctx;
852 struct compat_old_linux_dirent __user *dirent;
853 int result;
854 };
855
856 static int compat_fillonedir(void *__buf, const char *name, int namlen,
857 loff_t offset, u64 ino, unsigned int d_type)
858 {
859 struct compat_readdir_callback *buf = __buf;
860 struct compat_old_linux_dirent __user *dirent;
861 compat_ulong_t d_ino;
862
863 if (buf->result)
864 return -EINVAL;
865 d_ino = ino;
866 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
867 buf->result = -EOVERFLOW;
868 return -EOVERFLOW;
869 }
870 buf->result++;
871 dirent = buf->dirent;
872 if (!access_ok(VERIFY_WRITE, dirent,
873 (unsigned long)(dirent->d_name + namlen + 1) -
874 (unsigned long)dirent))
875 goto efault;
876 if ( __put_user(d_ino, &dirent->d_ino) ||
877 __put_user(offset, &dirent->d_offset) ||
878 __put_user(namlen, &dirent->d_namlen) ||
879 __copy_to_user(dirent->d_name, name, namlen) ||
880 __put_user(0, dirent->d_name + namlen))
881 goto efault;
882 return 0;
883 efault:
884 buf->result = -EFAULT;
885 return -EFAULT;
886 }
887
888 COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
889 struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
890 {
891 int error;
892 struct fd f = fdget(fd);
893 struct compat_readdir_callback buf = {
894 .ctx.actor = compat_fillonedir,
895 .dirent = dirent
896 };
897
898 if (!f.file)
899 return -EBADF;
900
901 error = iterate_dir(f.file, &buf.ctx);
902 if (buf.result)
903 error = buf.result;
904
905 fdput(f);
906 return error;
907 }
908
909 struct compat_linux_dirent {
910 compat_ulong_t d_ino;
911 compat_ulong_t d_off;
912 unsigned short d_reclen;
913 char d_name[1];
914 };
915
916 struct compat_getdents_callback {
917 struct dir_context ctx;
918 struct compat_linux_dirent __user *current_dir;
919 struct compat_linux_dirent __user *previous;
920 int count;
921 int error;
922 };
923
924 static 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;
962 efault:
963 buf->error = -EFAULT;
964 return -EFAULT;
965 }
966
967 COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
968 struct compat_linux_dirent __user *, dirent, unsigned int, count)
969 {
970 struct fd f;
971 struct compat_linux_dirent __user * lastdirent;
972 struct compat_getdents_callback buf = {
973 .ctx.actor = compat_filldir,
974 .current_dir = dirent,
975 .count = count
976 };
977 int error;
978
979 if (!access_ok(VERIFY_WRITE, dirent, count))
980 return -EFAULT;
981
982 f = fdget(fd);
983 if (!f.file)
984 return -EBADF;
985
986 error = iterate_dir(f.file, &buf.ctx);
987 if (error >= 0)
988 error = buf.error;
989 lastdirent = buf.previous;
990 if (lastdirent) {
991 if (put_user(buf.ctx.pos, &lastdirent->d_off))
992 error = -EFAULT;
993 else
994 error = count - buf.count;
995 }
996 fdput(f);
997 return error;
998 }
999
1000 #ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
1001
1002 struct compat_getdents_callback64 {
1003 struct dir_context ctx;
1004 struct linux_dirent64 __user *current_dir;
1005 struct linux_dirent64 __user *previous;
1006 int count;
1007 int error;
1008 };
1009
1010 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1011 u64 ino, unsigned int d_type)
1012 {
1013 struct linux_dirent64 __user *dirent;
1014 struct compat_getdents_callback64 *buf = __buf;
1015 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1016 sizeof(u64));
1017 u64 off;
1018
1019 buf->error = -EINVAL; /* only used if we fail.. */
1020 if (reclen > buf->count)
1021 return -EINVAL;
1022 dirent = buf->previous;
1023
1024 if (dirent) {
1025 if (__put_user_unaligned(offset, &dirent->d_off))
1026 goto efault;
1027 }
1028 dirent = buf->current_dir;
1029 if (__put_user_unaligned(ino, &dirent->d_ino))
1030 goto efault;
1031 off = 0;
1032 if (__put_user_unaligned(off, &dirent->d_off))
1033 goto efault;
1034 if (__put_user(reclen, &dirent->d_reclen))
1035 goto efault;
1036 if (__put_user(d_type, &dirent->d_type))
1037 goto efault;
1038 if (copy_to_user(dirent->d_name, name, namlen))
1039 goto efault;
1040 if (__put_user(0, dirent->d_name + namlen))
1041 goto efault;
1042 buf->previous = dirent;
1043 dirent = (void __user *)dirent + reclen;
1044 buf->current_dir = dirent;
1045 buf->count -= reclen;
1046 return 0;
1047 efault:
1048 buf->error = -EFAULT;
1049 return -EFAULT;
1050 }
1051
1052 COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
1053 struct linux_dirent64 __user *, dirent, unsigned int, count)
1054 {
1055 struct fd f;
1056 struct linux_dirent64 __user * lastdirent;
1057 struct compat_getdents_callback64 buf = {
1058 .ctx.actor = compat_filldir64,
1059 .current_dir = dirent,
1060 .count = count
1061 };
1062 int error;
1063
1064 if (!access_ok(VERIFY_WRITE, dirent, count))
1065 return -EFAULT;
1066
1067 f = fdget(fd);
1068 if (!f.file)
1069 return -EBADF;
1070
1071 error = iterate_dir(f.file, &buf.ctx);
1072 if (error >= 0)
1073 error = buf.error;
1074 lastdirent = buf.previous;
1075 if (lastdirent) {
1076 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
1077 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1078 error = -EFAULT;
1079 else
1080 error = count - buf.count;
1081 }
1082 fdput(f);
1083 return error;
1084 }
1085 #endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
1086
1087 /*
1088 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1089 * O_LARGEFILE flag.
1090 */
1091 COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1092 {
1093 return do_sys_open(AT_FDCWD, filename, flags, mode);
1094 }
1095
1096 /*
1097 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1098 * O_LARGEFILE flag.
1099 */
1100 COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1101 {
1102 return do_sys_open(dfd, filename, flags, mode);
1103 }
1104
1105 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1106
1107 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1108 int timeval, int ret)
1109 {
1110 struct timespec ts;
1111
1112 if (!p)
1113 return ret;
1114
1115 if (current->personality & STICKY_TIMEOUTS)
1116 goto sticky;
1117
1118 /* No update for zero timeout */
1119 if (!end_time->tv_sec && !end_time->tv_nsec)
1120 return ret;
1121
1122 ktime_get_ts(&ts);
1123 ts = timespec_sub(*end_time, ts);
1124 if (ts.tv_sec < 0)
1125 ts.tv_sec = ts.tv_nsec = 0;
1126
1127 if (timeval) {
1128 struct compat_timeval rtv;
1129
1130 rtv.tv_sec = ts.tv_sec;
1131 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1132
1133 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1134 return ret;
1135 } else {
1136 struct compat_timespec rts;
1137
1138 rts.tv_sec = ts.tv_sec;
1139 rts.tv_nsec = ts.tv_nsec;
1140
1141 if (!copy_to_user(p, &rts, sizeof(rts)))
1142 return ret;
1143 }
1144 /*
1145 * If an application puts its timeval in read-only memory, we
1146 * don't want the Linux-specific update to the timeval to
1147 * cause a fault after the select has completed
1148 * successfully. However, because we're not updating the
1149 * timeval, we can't restart the system call.
1150 */
1151
1152 sticky:
1153 if (ret == -ERESTARTNOHAND)
1154 ret = -EINTR;
1155 return ret;
1156 }
1157
1158 /*
1159 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1160 * 64-bit unsigned longs.
1161 */
1162 static
1163 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1164 unsigned long *fdset)
1165 {
1166 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1167 if (ufdset) {
1168 unsigned long odd;
1169
1170 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1171 return -EFAULT;
1172
1173 odd = nr & 1UL;
1174 nr &= ~1UL;
1175 while (nr) {
1176 unsigned long h, l;
1177 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1178 return -EFAULT;
1179 ufdset += 2;
1180 *fdset++ = h << 32 | l;
1181 nr -= 2;
1182 }
1183 if (odd && __get_user(*fdset, ufdset))
1184 return -EFAULT;
1185 } else {
1186 /* Tricky, must clear full unsigned long in the
1187 * kernel fdset at the end, this makes sure that
1188 * actually happens.
1189 */
1190 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1191 }
1192 return 0;
1193 }
1194
1195 static
1196 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1197 unsigned long *fdset)
1198 {
1199 unsigned long odd;
1200 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1201
1202 if (!ufdset)
1203 return 0;
1204
1205 odd = nr & 1UL;
1206 nr &= ~1UL;
1207 while (nr) {
1208 unsigned long h, l;
1209 l = *fdset++;
1210 h = l >> 32;
1211 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1212 return -EFAULT;
1213 ufdset += 2;
1214 nr -= 2;
1215 }
1216 if (odd && __put_user(*fdset, ufdset))
1217 return -EFAULT;
1218 return 0;
1219 }
1220
1221
1222 /*
1223 * This is a virtual copy of sys_select from fs/select.c and probably
1224 * should be compared to it from time to time
1225 */
1226
1227 /*
1228 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1229 * like to be certain this leads to no problems. So I return
1230 * EINTR just for safety.
1231 *
1232 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1233 * I'm trying ERESTARTNOHAND which restart only when you want to.
1234 */
1235 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1236 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1237 struct timespec *end_time)
1238 {
1239 fd_set_bits fds;
1240 void *bits;
1241 int size, max_fds, ret = -EINVAL;
1242 struct fdtable *fdt;
1243 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1244
1245 if (n < 0)
1246 goto out_nofds;
1247
1248 /* max_fds can increase, so grab it once to avoid race */
1249 rcu_read_lock();
1250 fdt = files_fdtable(current->files);
1251 max_fds = fdt->max_fds;
1252 rcu_read_unlock();
1253 if (n > max_fds)
1254 n = max_fds;
1255
1256 /*
1257 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1258 * since we used fdset we need to allocate memory in units of
1259 * long-words.
1260 */
1261 size = FDS_BYTES(n);
1262 bits = stack_fds;
1263 if (size > sizeof(stack_fds) / 6) {
1264 bits = kmalloc(6 * size, GFP_KERNEL);
1265 ret = -ENOMEM;
1266 if (!bits)
1267 goto out_nofds;
1268 }
1269 fds.in = (unsigned long *) bits;
1270 fds.out = (unsigned long *) (bits + size);
1271 fds.ex = (unsigned long *) (bits + 2*size);
1272 fds.res_in = (unsigned long *) (bits + 3*size);
1273 fds.res_out = (unsigned long *) (bits + 4*size);
1274 fds.res_ex = (unsigned long *) (bits + 5*size);
1275
1276 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1277 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1278 (ret = compat_get_fd_set(n, exp, fds.ex)))
1279 goto out;
1280 zero_fd_set(n, fds.res_in);
1281 zero_fd_set(n, fds.res_out);
1282 zero_fd_set(n, fds.res_ex);
1283
1284 ret = do_select(n, &fds, end_time);
1285
1286 if (ret < 0)
1287 goto out;
1288 if (!ret) {
1289 ret = -ERESTARTNOHAND;
1290 if (signal_pending(current))
1291 goto out;
1292 ret = 0;
1293 }
1294
1295 if (compat_set_fd_set(n, inp, fds.res_in) ||
1296 compat_set_fd_set(n, outp, fds.res_out) ||
1297 compat_set_fd_set(n, exp, fds.res_ex))
1298 ret = -EFAULT;
1299 out:
1300 if (bits != stack_fds)
1301 kfree(bits);
1302 out_nofds:
1303 return ret;
1304 }
1305
1306 COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
1307 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1308 struct compat_timeval __user *, tvp)
1309 {
1310 struct timespec end_time, *to = NULL;
1311 struct compat_timeval tv;
1312 int ret;
1313
1314 if (tvp) {
1315 if (copy_from_user(&tv, tvp, sizeof(tv)))
1316 return -EFAULT;
1317
1318 to = &end_time;
1319 if (poll_select_set_timeout(to,
1320 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1321 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1322 return -EINVAL;
1323 }
1324
1325 ret = compat_core_sys_select(n, inp, outp, exp, to);
1326 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1327
1328 return ret;
1329 }
1330
1331 struct compat_sel_arg_struct {
1332 compat_ulong_t n;
1333 compat_uptr_t inp;
1334 compat_uptr_t outp;
1335 compat_uptr_t exp;
1336 compat_uptr_t tvp;
1337 };
1338
1339 COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg)
1340 {
1341 struct compat_sel_arg_struct a;
1342
1343 if (copy_from_user(&a, arg, sizeof(a)))
1344 return -EFAULT;
1345 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1346 compat_ptr(a.exp), compat_ptr(a.tvp));
1347 }
1348
1349 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1350 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1351 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1352 compat_size_t sigsetsize)
1353 {
1354 compat_sigset_t ss32;
1355 sigset_t ksigmask, sigsaved;
1356 struct compat_timespec ts;
1357 struct timespec end_time, *to = NULL;
1358 int ret;
1359
1360 if (tsp) {
1361 if (copy_from_user(&ts, tsp, sizeof(ts)))
1362 return -EFAULT;
1363
1364 to = &end_time;
1365 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1366 return -EINVAL;
1367 }
1368
1369 if (sigmask) {
1370 if (sigsetsize != sizeof(compat_sigset_t))
1371 return -EINVAL;
1372 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1373 return -EFAULT;
1374 sigset_from_compat(&ksigmask, &ss32);
1375
1376 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1377 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1378 }
1379
1380 ret = compat_core_sys_select(n, inp, outp, exp, to);
1381 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1382
1383 if (ret == -ERESTARTNOHAND) {
1384 /*
1385 * Don't restore the signal mask yet. Let do_signal() deliver
1386 * the signal on the way back to userspace, before the signal
1387 * mask is restored.
1388 */
1389 if (sigmask) {
1390 memcpy(&current->saved_sigmask, &sigsaved,
1391 sizeof(sigsaved));
1392 set_restore_sigmask();
1393 }
1394 } else if (sigmask)
1395 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1396
1397 return ret;
1398 }
1399
1400 COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
1401 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1402 struct compat_timespec __user *, tsp, void __user *, sig)
1403 {
1404 compat_size_t sigsetsize = 0;
1405 compat_uptr_t up = 0;
1406
1407 if (sig) {
1408 if (!access_ok(VERIFY_READ, sig,
1409 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1410 __get_user(up, (compat_uptr_t __user *)sig) ||
1411 __get_user(sigsetsize,
1412 (compat_size_t __user *)(sig+sizeof(up))))
1413 return -EFAULT;
1414 }
1415 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1416 sigsetsize);
1417 }
1418
1419 COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
1420 unsigned int, nfds, struct compat_timespec __user *, tsp,
1421 const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
1422 {
1423 compat_sigset_t ss32;
1424 sigset_t ksigmask, sigsaved;
1425 struct compat_timespec ts;
1426 struct timespec end_time, *to = NULL;
1427 int ret;
1428
1429 if (tsp) {
1430 if (copy_from_user(&ts, tsp, sizeof(ts)))
1431 return -EFAULT;
1432
1433 to = &end_time;
1434 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1435 return -EINVAL;
1436 }
1437
1438 if (sigmask) {
1439 if (sigsetsize != sizeof(compat_sigset_t))
1440 return -EINVAL;
1441 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1442 return -EFAULT;
1443 sigset_from_compat(&ksigmask, &ss32);
1444
1445 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1446 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1447 }
1448
1449 ret = do_sys_poll(ufds, nfds, to);
1450
1451 /* We can restart this syscall, usually */
1452 if (ret == -EINTR) {
1453 /*
1454 * Don't restore the signal mask yet. Let do_signal() deliver
1455 * the signal on the way back to userspace, before the signal
1456 * mask is restored.
1457 */
1458 if (sigmask) {
1459 memcpy(&current->saved_sigmask, &sigsaved,
1460 sizeof(sigsaved));
1461 set_restore_sigmask();
1462 }
1463 ret = -ERESTARTNOHAND;
1464 } else if (sigmask)
1465 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1466
1467 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1468
1469 return ret;
1470 }
1471
1472 #ifdef CONFIG_FHANDLE
1473 /*
1474 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1475 * doesn't set the O_LARGEFILE flag.
1476 */
1477 COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1478 struct file_handle __user *, handle, int, flags)
1479 {
1480 return do_handle_open(mountdirfd, handle, flags);
1481 }
1482 #endif
Linux kernel stable tree