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Merge tag 'usb-4.6-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[deliverable/linux.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/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_OFD_GETLK:
461 case F_OFD_SETLK:
462 case F_OFD_SETLKW:
463 ret = get_compat_flock64(&f, compat_ptr(arg));
464 if (ret != 0)
465 break;
466 old_fs = get_fs();
467 set_fs(KERNEL_DS);
468 conv_cmd = convert_fcntl_cmd(cmd);
469 ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
470 set_fs(old_fs);
471 if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) {
472 /* need to return lock information - see above for commentary */
473 if (f.l_start > COMPAT_LOFF_T_MAX)
474 ret = -EOVERFLOW;
475 if (f.l_len > COMPAT_LOFF_T_MAX)
476 f.l_len = COMPAT_LOFF_T_MAX;
477 if (ret == 0)
478 ret = put_compat_flock64(&f, compat_ptr(arg));
479 }
480 break;
481
482 default:
483 ret = sys_fcntl(fd, cmd, arg);
484 break;
485 }
486 return ret;
487 }
488
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_OFD_GETLK:
497 case F_OFD_SETLK:
498 case F_OFD_SETLKW:
499 return -EINVAL;
500 }
501 return compat_sys_fcntl64(fd, cmd, arg);
502 }
503
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 void *options;
796 char *kernel_dev;
797 int retval;
798
799 kernel_type = copy_mount_string(type);
800 retval = PTR_ERR(kernel_type);
801 if (IS_ERR(kernel_type))
802 goto out;
803
804 kernel_dev = copy_mount_string(dev_name);
805 retval = PTR_ERR(kernel_dev);
806 if (IS_ERR(kernel_dev))
807 goto out1;
808
809 options = copy_mount_options(data);
810 retval = PTR_ERR(options);
811 if (IS_ERR(options))
812 goto out2;
813
814 if (kernel_type && options) {
815 if (!strcmp(kernel_type, NCPFS_NAME)) {
816 do_ncp_super_data_conv(options);
817 } else if (!strcmp(kernel_type, NFS4_NAME)) {
818 retval = -EINVAL;
819 if (do_nfs4_super_data_conv(options))
820 goto out3;
821 }
822 }
823
824 retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
825
826 out3:
827 kfree(options);
828 out2:
829 kfree(kernel_dev);
830 out1:
831 kfree(kernel_type);
832 out:
833 return retval;
834 }
835
836 struct compat_old_linux_dirent {
837 compat_ulong_t d_ino;
838 compat_ulong_t d_offset;
839 unsigned short d_namlen;
840 char d_name[1];
841 };
842
843 struct compat_readdir_callback {
844 struct dir_context ctx;
845 struct compat_old_linux_dirent __user *dirent;
846 int result;
847 };
848
849 static int compat_fillonedir(struct dir_context *ctx, const char *name,
850 int namlen, loff_t offset, u64 ino,
851 unsigned int d_type)
852 {
853 struct compat_readdir_callback *buf =
854 container_of(ctx, struct compat_readdir_callback, ctx);
855 struct compat_old_linux_dirent __user *dirent;
856 compat_ulong_t d_ino;
857
858 if (buf->result)
859 return -EINVAL;
860 d_ino = ino;
861 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
862 buf->result = -EOVERFLOW;
863 return -EOVERFLOW;
864 }
865 buf->result++;
866 dirent = buf->dirent;
867 if (!access_ok(VERIFY_WRITE, dirent,
868 (unsigned long)(dirent->d_name + namlen + 1) -
869 (unsigned long)dirent))
870 goto efault;
871 if ( __put_user(d_ino, &dirent->d_ino) ||
872 __put_user(offset, &dirent->d_offset) ||
873 __put_user(namlen, &dirent->d_namlen) ||
874 __copy_to_user(dirent->d_name, name, namlen) ||
875 __put_user(0, dirent->d_name + namlen))
876 goto efault;
877 return 0;
878 efault:
879 buf->result = -EFAULT;
880 return -EFAULT;
881 }
882
883 COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
884 struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
885 {
886 int error;
887 struct fd f = fdget(fd);
888 struct compat_readdir_callback buf = {
889 .ctx.actor = compat_fillonedir,
890 .dirent = dirent
891 };
892
893 if (!f.file)
894 return -EBADF;
895
896 error = iterate_dir(f.file, &buf.ctx);
897 if (buf.result)
898 error = buf.result;
899
900 fdput(f);
901 return error;
902 }
903
904 struct compat_linux_dirent {
905 compat_ulong_t d_ino;
906 compat_ulong_t d_off;
907 unsigned short d_reclen;
908 char d_name[1];
909 };
910
911 struct compat_getdents_callback {
912 struct dir_context ctx;
913 struct compat_linux_dirent __user *current_dir;
914 struct compat_linux_dirent __user *previous;
915 int count;
916 int error;
917 };
918
919 static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
920 loff_t offset, u64 ino, unsigned int d_type)
921 {
922 struct compat_linux_dirent __user * dirent;
923 struct compat_getdents_callback *buf =
924 container_of(ctx, struct compat_getdents_callback, ctx);
925 compat_ulong_t d_ino;
926 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
927 namlen + 2, sizeof(compat_long_t));
928
929 buf->error = -EINVAL; /* only used if we fail.. */
930 if (reclen > buf->count)
931 return -EINVAL;
932 d_ino = ino;
933 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
934 buf->error = -EOVERFLOW;
935 return -EOVERFLOW;
936 }
937 dirent = buf->previous;
938 if (dirent) {
939 if (__put_user(offset, &dirent->d_off))
940 goto efault;
941 }
942 dirent = buf->current_dir;
943 if (__put_user(d_ino, &dirent->d_ino))
944 goto efault;
945 if (__put_user(reclen, &dirent->d_reclen))
946 goto efault;
947 if (copy_to_user(dirent->d_name, name, namlen))
948 goto efault;
949 if (__put_user(0, dirent->d_name + namlen))
950 goto efault;
951 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
952 goto efault;
953 buf->previous = dirent;
954 dirent = (void __user *)dirent + reclen;
955 buf->current_dir = dirent;
956 buf->count -= reclen;
957 return 0;
958 efault:
959 buf->error = -EFAULT;
960 return -EFAULT;
961 }
962
963 COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
964 struct compat_linux_dirent __user *, dirent, unsigned int, count)
965 {
966 struct fd f;
967 struct compat_linux_dirent __user * lastdirent;
968 struct compat_getdents_callback buf = {
969 .ctx.actor = compat_filldir,
970 .current_dir = dirent,
971 .count = count
972 };
973 int error;
974
975 if (!access_ok(VERIFY_WRITE, dirent, count))
976 return -EFAULT;
977
978 f = fdget(fd);
979 if (!f.file)
980 return -EBADF;
981
982 error = iterate_dir(f.file, &buf.ctx);
983 if (error >= 0)
984 error = buf.error;
985 lastdirent = buf.previous;
986 if (lastdirent) {
987 if (put_user(buf.ctx.pos, &lastdirent->d_off))
988 error = -EFAULT;
989 else
990 error = count - buf.count;
991 }
992 fdput(f);
993 return error;
994 }
995
996 #ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
997
998 struct compat_getdents_callback64 {
999 struct dir_context ctx;
1000 struct linux_dirent64 __user *current_dir;
1001 struct linux_dirent64 __user *previous;
1002 int count;
1003 int error;
1004 };
1005
1006 static int compat_filldir64(struct dir_context *ctx, const char *name,
1007 int namlen, loff_t offset, u64 ino,
1008 unsigned int d_type)
1009 {
1010 struct linux_dirent64 __user *dirent;
1011 struct compat_getdents_callback64 *buf =
1012 container_of(ctx, struct compat_getdents_callback64, ctx);
1013 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1014 sizeof(u64));
1015 u64 off;
1016
1017 buf->error = -EINVAL; /* only used if we fail.. */
1018 if (reclen > buf->count)
1019 return -EINVAL;
1020 dirent = buf->previous;
1021
1022 if (dirent) {
1023 if (__put_user_unaligned(offset, &dirent->d_off))
1024 goto efault;
1025 }
1026 dirent = buf->current_dir;
1027 if (__put_user_unaligned(ino, &dirent->d_ino))
1028 goto efault;
1029 off = 0;
1030 if (__put_user_unaligned(off, &dirent->d_off))
1031 goto efault;
1032 if (__put_user(reclen, &dirent->d_reclen))
1033 goto efault;
1034 if (__put_user(d_type, &dirent->d_type))
1035 goto efault;
1036 if (copy_to_user(dirent->d_name, name, namlen))
1037 goto efault;
1038 if (__put_user(0, dirent->d_name + namlen))
1039 goto efault;
1040 buf->previous = dirent;
1041 dirent = (void __user *)dirent + reclen;
1042 buf->current_dir = dirent;
1043 buf->count -= reclen;
1044 return 0;
1045 efault:
1046 buf->error = -EFAULT;
1047 return -EFAULT;
1048 }
1049
1050 COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
1051 struct linux_dirent64 __user *, dirent, unsigned int, count)
1052 {
1053 struct fd f;
1054 struct linux_dirent64 __user * lastdirent;
1055 struct compat_getdents_callback64 buf = {
1056 .ctx.actor = compat_filldir64,
1057 .current_dir = dirent,
1058 .count = count
1059 };
1060 int error;
1061
1062 if (!access_ok(VERIFY_WRITE, dirent, count))
1063 return -EFAULT;
1064
1065 f = fdget(fd);
1066 if (!f.file)
1067 return -EBADF;
1068
1069 error = iterate_dir(f.file, &buf.ctx);
1070 if (error >= 0)
1071 error = buf.error;
1072 lastdirent = buf.previous;
1073 if (lastdirent) {
1074 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
1075 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1076 error = -EFAULT;
1077 else
1078 error = count - buf.count;
1079 }
1080 fdput(f);
1081 return error;
1082 }
1083 #endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
1084
1085 /*
1086 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1087 * O_LARGEFILE flag.
1088 */
1089 COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1090 {
1091 return do_sys_open(AT_FDCWD, filename, flags, mode);
1092 }
1093
1094 /*
1095 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1096 * O_LARGEFILE flag.
1097 */
1098 COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1099 {
1100 return do_sys_open(dfd, filename, flags, mode);
1101 }
1102
1103 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1104
1105 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1106 int timeval, int ret)
1107 {
1108 struct timespec ts;
1109
1110 if (!p)
1111 return ret;
1112
1113 if (current->personality & STICKY_TIMEOUTS)
1114 goto sticky;
1115
1116 /* No update for zero timeout */
1117 if (!end_time->tv_sec && !end_time->tv_nsec)
1118 return ret;
1119
1120 ktime_get_ts(&ts);
1121 ts = timespec_sub(*end_time, ts);
1122 if (ts.tv_sec < 0)
1123 ts.tv_sec = ts.tv_nsec = 0;
1124
1125 if (timeval) {
1126 struct compat_timeval rtv;
1127
1128 rtv.tv_sec = ts.tv_sec;
1129 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1130
1131 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1132 return ret;
1133 } else {
1134 struct compat_timespec rts;
1135
1136 rts.tv_sec = ts.tv_sec;
1137 rts.tv_nsec = ts.tv_nsec;
1138
1139 if (!copy_to_user(p, &rts, sizeof(rts)))
1140 return ret;
1141 }
1142 /*
1143 * If an application puts its timeval in read-only memory, we
1144 * don't want the Linux-specific update to the timeval to
1145 * cause a fault after the select has completed
1146 * successfully. However, because we're not updating the
1147 * timeval, we can't restart the system call.
1148 */
1149
1150 sticky:
1151 if (ret == -ERESTARTNOHAND)
1152 ret = -EINTR;
1153 return ret;
1154 }
1155
1156 /*
1157 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1158 * 64-bit unsigned longs.
1159 */
1160 static
1161 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1162 unsigned long *fdset)
1163 {
1164 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1165 if (ufdset) {
1166 unsigned long odd;
1167
1168 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1169 return -EFAULT;
1170
1171 odd = nr & 1UL;
1172 nr &= ~1UL;
1173 while (nr) {
1174 unsigned long h, l;
1175 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1176 return -EFAULT;
1177 ufdset += 2;
1178 *fdset++ = h << 32 | l;
1179 nr -= 2;
1180 }
1181 if (odd && __get_user(*fdset, ufdset))
1182 return -EFAULT;
1183 } else {
1184 /* Tricky, must clear full unsigned long in the
1185 * kernel fdset at the end, this makes sure that
1186 * actually happens.
1187 */
1188 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1189 }
1190 return 0;
1191 }
1192
1193 static
1194 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1195 unsigned long *fdset)
1196 {
1197 unsigned long odd;
1198 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1199
1200 if (!ufdset)
1201 return 0;
1202
1203 odd = nr & 1UL;
1204 nr &= ~1UL;
1205 while (nr) {
1206 unsigned long h, l;
1207 l = *fdset++;
1208 h = l >> 32;
1209 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1210 return -EFAULT;
1211 ufdset += 2;
1212 nr -= 2;
1213 }
1214 if (odd && __put_user(*fdset, ufdset))
1215 return -EFAULT;
1216 return 0;
1217 }
1218
1219
1220 /*
1221 * This is a virtual copy of sys_select from fs/select.c and probably
1222 * should be compared to it from time to time
1223 */
1224
1225 /*
1226 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1227 * like to be certain this leads to no problems. So I return
1228 * EINTR just for safety.
1229 *
1230 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1231 * I'm trying ERESTARTNOHAND which restart only when you want to.
1232 */
1233 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1234 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1235 struct timespec *end_time)
1236 {
1237 fd_set_bits fds;
1238 void *bits;
1239 int size, max_fds, ret = -EINVAL;
1240 struct fdtable *fdt;
1241 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1242
1243 if (n < 0)
1244 goto out_nofds;
1245
1246 /* max_fds can increase, so grab it once to avoid race */
1247 rcu_read_lock();
1248 fdt = files_fdtable(current->files);
1249 max_fds = fdt->max_fds;
1250 rcu_read_unlock();
1251 if (n > max_fds)
1252 n = max_fds;
1253
1254 /*
1255 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1256 * since we used fdset we need to allocate memory in units of
1257 * long-words.
1258 */
1259 size = FDS_BYTES(n);
1260 bits = stack_fds;
1261 if (size > sizeof(stack_fds) / 6) {
1262 bits = kmalloc(6 * size, GFP_KERNEL);
1263 ret = -ENOMEM;
1264 if (!bits)
1265 goto out_nofds;
1266 }
1267 fds.in = (unsigned long *) bits;
1268 fds.out = (unsigned long *) (bits + size);
1269 fds.ex = (unsigned long *) (bits + 2*size);
1270 fds.res_in = (unsigned long *) (bits + 3*size);
1271 fds.res_out = (unsigned long *) (bits + 4*size);
1272 fds.res_ex = (unsigned long *) (bits + 5*size);
1273
1274 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1275 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1276 (ret = compat_get_fd_set(n, exp, fds.ex)))
1277 goto out;
1278 zero_fd_set(n, fds.res_in);
1279 zero_fd_set(n, fds.res_out);
1280 zero_fd_set(n, fds.res_ex);
1281
1282 ret = do_select(n, &fds, end_time);
1283
1284 if (ret < 0)
1285 goto out;
1286 if (!ret) {
1287 ret = -ERESTARTNOHAND;
1288 if (signal_pending(current))
1289 goto out;
1290 ret = 0;
1291 }
1292
1293 if (compat_set_fd_set(n, inp, fds.res_in) ||
1294 compat_set_fd_set(n, outp, fds.res_out) ||
1295 compat_set_fd_set(n, exp, fds.res_ex))
1296 ret = -EFAULT;
1297 out:
1298 if (bits != stack_fds)
1299 kfree(bits);
1300 out_nofds:
1301 return ret;
1302 }
1303
1304 COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
1305 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1306 struct compat_timeval __user *, tvp)
1307 {
1308 struct timespec end_time, *to = NULL;
1309 struct compat_timeval tv;
1310 int ret;
1311
1312 if (tvp) {
1313 if (copy_from_user(&tv, tvp, sizeof(tv)))
1314 return -EFAULT;
1315
1316 to = &end_time;
1317 if (poll_select_set_timeout(to,
1318 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1319 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1320 return -EINVAL;
1321 }
1322
1323 ret = compat_core_sys_select(n, inp, outp, exp, to);
1324 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1325
1326 return ret;
1327 }
1328
1329 struct compat_sel_arg_struct {
1330 compat_ulong_t n;
1331 compat_uptr_t inp;
1332 compat_uptr_t outp;
1333 compat_uptr_t exp;
1334 compat_uptr_t tvp;
1335 };
1336
1337 COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg)
1338 {
1339 struct compat_sel_arg_struct a;
1340
1341 if (copy_from_user(&a, arg, sizeof(a)))
1342 return -EFAULT;
1343 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1344 compat_ptr(a.exp), compat_ptr(a.tvp));
1345 }
1346
1347 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1348 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1349 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1350 compat_size_t sigsetsize)
1351 {
1352 compat_sigset_t ss32;
1353 sigset_t ksigmask, sigsaved;
1354 struct compat_timespec ts;
1355 struct timespec end_time, *to = NULL;
1356 int ret;
1357
1358 if (tsp) {
1359 if (copy_from_user(&ts, tsp, sizeof(ts)))
1360 return -EFAULT;
1361
1362 to = &end_time;
1363 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1364 return -EINVAL;
1365 }
1366
1367 if (sigmask) {
1368 if (sigsetsize != sizeof(compat_sigset_t))
1369 return -EINVAL;
1370 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1371 return -EFAULT;
1372 sigset_from_compat(&ksigmask, &ss32);
1373
1374 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1375 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1376 }
1377
1378 ret = compat_core_sys_select(n, inp, outp, exp, to);
1379 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1380
1381 if (ret == -ERESTARTNOHAND) {
1382 /*
1383 * Don't restore the signal mask yet. Let do_signal() deliver
1384 * the signal on the way back to userspace, before the signal
1385 * mask is restored.
1386 */
1387 if (sigmask) {
1388 memcpy(&current->saved_sigmask, &sigsaved,
1389 sizeof(sigsaved));
1390 set_restore_sigmask();
1391 }
1392 } else if (sigmask)
1393 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1394
1395 return ret;
1396 }
1397
1398 COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
1399 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1400 struct compat_timespec __user *, tsp, void __user *, sig)
1401 {
1402 compat_size_t sigsetsize = 0;
1403 compat_uptr_t up = 0;
1404
1405 if (sig) {
1406 if (!access_ok(VERIFY_READ, sig,
1407 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1408 __get_user(up, (compat_uptr_t __user *)sig) ||
1409 __get_user(sigsetsize,
1410 (compat_size_t __user *)(sig+sizeof(up))))
1411 return -EFAULT;
1412 }
1413 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1414 sigsetsize);
1415 }
1416
1417 COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
1418 unsigned int, nfds, struct compat_timespec __user *, tsp,
1419 const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
1420 {
1421 compat_sigset_t ss32;
1422 sigset_t ksigmask, sigsaved;
1423 struct compat_timespec ts;
1424 struct timespec end_time, *to = NULL;
1425 int ret;
1426
1427 if (tsp) {
1428 if (copy_from_user(&ts, tsp, sizeof(ts)))
1429 return -EFAULT;
1430
1431 to = &end_time;
1432 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1433 return -EINVAL;
1434 }
1435
1436 if (sigmask) {
1437 if (sigsetsize != sizeof(compat_sigset_t))
1438 return -EINVAL;
1439 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1440 return -EFAULT;
1441 sigset_from_compat(&ksigmask, &ss32);
1442
1443 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1444 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1445 }
1446
1447 ret = do_sys_poll(ufds, nfds, to);
1448
1449 /* We can restart this syscall, usually */
1450 if (ret == -EINTR) {
1451 /*
1452 * Don't restore the signal mask yet. Let do_signal() deliver
1453 * the signal on the way back to userspace, before the signal
1454 * mask is restored.
1455 */
1456 if (sigmask) {
1457 memcpy(&current->saved_sigmask, &sigsaved,
1458 sizeof(sigsaved));
1459 set_restore_sigmask();
1460 }
1461 ret = -ERESTARTNOHAND;
1462 } else if (sigmask)
1463 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1464
1465 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1466
1467 return ret;
1468 }
1469
1470 #ifdef CONFIG_FHANDLE
1471 /*
1472 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1473 * doesn't set the O_LARGEFILE flag.
1474 */
1475 COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1476 struct file_handle __user *, handle, int, flags)
1477 {
1478 return do_handle_open(mountdirfd, handle, flags);
1479 }
1480 #endif
Linux kernel - Deliverables
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