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[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / compat.c
CommitLineData
1da177e4
LT		 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
a2531293 11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
1da177e4
LT		 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
85c9fe8f 18#include <linux/stddef.h>
022a1692 19#include <linux/kernel.h>
1da177e4
LT		 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>
9f3acc31 28#include <linux/fdtable.h>
1da177e4 29#include <linux/vfs.h>
1da177e4
LT		 30#include <linux/ioctl.h>
31#include <linux/init.h>
1da177e4 32#include <linux/ncp_mount.h>
9a9947bf 33#include <linux/nfs4_mount.h>
1da177e4
LT		 34#include <linux/syscalls.h>
35#include <linux/ctype.h>
1da177e4 36#include <linux/dirent.h>
0eeca283 37#include <linux/fsnotify.h>
1da177e4 38#include <linux/highuid.h>
1da177e4
LT		 39#include <linux/personality.h>
40#include <linux/rwsem.h>
8f0ab514 41#include <linux/tsacct_kern.h>
6272e266 42#include <linux/security.h>
a1f8e7f7 43#include <linux/highmem.h>
6d18c922 44#include <linux/signal.h>
bd01f843 45#include <linux/poll.h>
4a805e86 46#include <linux/mm.h>
498052bb 47#include <linux/fs_struct.h>
5a0e3ad6 48#include <linux/slab.h>
504b701b 49#include <linux/pagemap.h>
1da177e4 50
1da177e4
LT		 51#include <asm/uaccess.h>
52#include <asm/mmu_context.h>
53#include <asm/ioctls.h>
07f3f05c 54#include "internal.h"
9f72949f 55
bebfa101
AK		 56int compat_log = 1;
57
58int compat_printk(const char *fmt, ...)
59{
60 va_list ap;
61 int ret;
62 if (!compat_log)
63 return 0;
64 va_start(ap, fmt);
65 ret = vprintk(fmt, ap);
66 va_end(ap);
67 return ret;
68}
69
1da177e4
LT		 70/*
71 * Not all architectures have sys_utime, so implement this in terms
72 * of sys_utimes.
73 */
c7887325
DH		 74asmlinkage long compat_sys_utime(const char __user *filename,
75 struct compat_utimbuf __user *t)
1da177e4 76{
1c710c89 77 struct timespec tv[2];
1da177e4
LT		 78
79 if (t) {
80 if (get_user(tv[0].tv_sec, &t->actime) ||
81 get_user(tv[1].tv_sec, &t->modtime))
82 return -EFAULT;
1c710c89
UD		 83 tv[0].tv_nsec = 0;
84 tv[1].tv_nsec = 0;
1da177e4 85 }
1c710c89
UD		 86 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
87}
88
c7887325 89asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
1c710c89
UD		 90{
91 struct timespec tv[2];
92
93 if (t) {
94 if (get_compat_timespec(&tv[0], &t[0]) ||
95 get_compat_timespec(&tv[1], &t[1]))
96 return -EFAULT;
97
1c710c89
UD		 98 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
99 return 0;
100 }
101 return do_utimes(dfd, filename, t ? tv : NULL, flags);
1da177e4
LT		 102}
103
c7887325 104asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
1da177e4 105{
1c710c89 106 struct timespec tv[2];
1da177e4 107
9ad11ab4 108 if (t) {
1da177e4 109 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
1c710c89 110 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
1da177e4 111 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
1c710c89 112 get_user(tv[1].tv_nsec, &t[1].tv_usec))
9ad11ab4 113 return -EFAULT;
1c710c89
UD		 114 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
115 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
116 return -EINVAL;
117 tv[0].tv_nsec *= 1000;
118 tv[1].tv_nsec *= 1000;
9ad11ab4 119 }
1c710c89 120 return do_utimes(dfd, filename, t ? tv : NULL, 0);
5590ff0d
UD		 121}
122
c7887325 123asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
5590ff0d
UD		 124{
125 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 126}
127
f7a5000f
CH		 128static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
129{
fcf83067 130 struct compat_stat tmp;
f7a5000f 131
fcf83067
AV		 132 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
133 return -EOVERFLOW;
f7a5000f 134
fcf83067
AV		 135 memset(&tmp, 0, sizeof(tmp));
136 tmp.st_dev = old_encode_dev(stat->dev);
137 tmp.st_ino = stat->ino;
138 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
f7a5000f 139 return -EOVERFLOW;
fcf83067
AV		 140 tmp.st_mode = stat->mode;
141 tmp.st_nlink = stat->nlink;
142 if (tmp.st_nlink != stat->nlink)
f7a5000f 143 return -EOVERFLOW;
a7c1938e
EB		 144 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
145 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
fcf83067
AV		 146 tmp.st_rdev = old_encode_dev(stat->rdev);
147 if ((u64) stat->size > MAX_NON_LFS)
148 return -EOVERFLOW;
149 tmp.st_size = stat->size;
150 tmp.st_atime = stat->atime.tv_sec;
151 tmp.st_atime_nsec = stat->atime.tv_nsec;
152 tmp.st_mtime = stat->mtime.tv_sec;
153 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
154 tmp.st_ctime = stat->ctime.tv_sec;
155 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
156 tmp.st_blocks = stat->blocks;
157 tmp.st_blksize = stat->blksize;
158 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
f7a5000f
CH		 159}
160
c7887325 161asmlinkage long compat_sys_newstat(const char __user * filename,
1da177e4
LT		 162 struct compat_stat __user *statbuf)
163{
164 struct kstat stat;
2eae7a18 165 int error;
1da177e4 166
2eae7a18
CH		 167 error = vfs_stat(filename, &stat);
168 if (error)
169 return error;
170 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 171}
172
c7887325 173asmlinkage long compat_sys_newlstat(const char __user * filename,
1da177e4
LT		 174 struct compat_stat __user *statbuf)
175{
176 struct kstat stat;
2eae7a18 177 int error;
1da177e4 178
2eae7a18
CH		 179 error = vfs_lstat(filename, &stat);
180 if (error)
181 return error;
182 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 183}
184
82d821dd 185#ifndef __ARCH_WANT_STAT64
c7887325
DH		 186asmlinkage long compat_sys_newfstatat(unsigned int dfd,
187 const char __user *filename,
5590ff0d
UD		 188 struct compat_stat __user *statbuf, int flag)
189{
190 struct kstat stat;
0112fc22 191 int error;
5590ff0d 192
0112fc22
OD		 193 error = vfs_fstatat(dfd, filename, &stat, flag);
194 if (error)
195 return error;
196 return cp_compat_stat(&stat, statbuf);
5590ff0d 197}
82d821dd 198#endif
5590ff0d 199
1da177e4
LT		 200asmlinkage long compat_sys_newfstat(unsigned int fd,
201 struct compat_stat __user * statbuf)
202{
203 struct kstat stat;
204 int error = vfs_fstat(fd, &stat);
205
206 if (!error)
207 error = cp_compat_stat(&stat, statbuf);
208 return error;
209}
210
211static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
212{
213
214 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 215 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
216 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 217 return -EOVERFLOW;
218 /* f_files and f_ffree may be -1; it's okay
219 * to stuff that into 32 bits */
220 if (kbuf->f_files != 0xffffffffffffffffULL
221 && (kbuf->f_files & 0xffffffff00000000ULL))
222 return -EOVERFLOW;
223 if (kbuf->f_ffree != 0xffffffffffffffffULL
224 && (kbuf->f_ffree & 0xffffffff00000000ULL))
225 return -EOVERFLOW;
226 }
227 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
228 __put_user(kbuf->f_type, &ubuf->f_type) ||
229 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
230 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
231 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
232 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
233 __put_user(kbuf->f_files, &ubuf->f_files) ||
234 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
235 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
236 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
237 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
238 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
1448c721
EB		 239 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
240 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
1da177e4
LT		 241 return -EFAULT;
242 return 0;
243}
244
245/*
974d879e 246 * The following statfs calls are copies of code from fs/statfs.c and
1da177e4
LT		 247 * should be checked against those from time to time
248 */
2d8f3038 249asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
1da177e4 250{
c8b91acc
AV		 251 struct kstatfs tmp;
252 int error = user_statfs(pathname, &tmp);
253 if (!error)
254 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 255 return error;
256}
257
258asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
259{
1da177e4 260 struct kstatfs tmp;
c8b91acc 261 int error = fd_statfs(fd, &tmp);
86e07ce7
DG		 262 if (!error)
263 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 264 return error;
265}
266
267static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
268{
269 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 270 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
271 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 272 return -EOVERFLOW;
273 /* f_files and f_ffree may be -1; it's okay
274 * to stuff that into 32 bits */
275 if (kbuf->f_files != 0xffffffffffffffffULL
276 && (kbuf->f_files & 0xffffffff00000000ULL))
277 return -EOVERFLOW;
278 if (kbuf->f_ffree != 0xffffffffffffffffULL
279 && (kbuf->f_ffree & 0xffffffff00000000ULL))
280 return -EOVERFLOW;
281 }
282 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
283 __put_user(kbuf->f_type, &ubuf->f_type) ||
284 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
285 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
286 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
287 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
288 __put_user(kbuf->f_files, &ubuf->f_files) ||
289 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
290 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
291 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
292 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
e0bb6bda
NK		 293 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
294 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
295 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
1da177e4
LT		 296 return -EFAULT;
297 return 0;
298}
299
2d8f3038 300asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
1da177e4 301{
c8b91acc 302 struct kstatfs tmp;
1da177e4
LT		 303 int error;
304
305 if (sz != sizeof(*buf))
306 return -EINVAL;
307
c8b91acc
AV		 308 error = user_statfs(pathname, &tmp);
309 if (!error)
310 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 311 return error;
312}
313
314asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
315{
1da177e4
LT		 316 struct kstatfs tmp;
317 int error;
318
319 if (sz != sizeof(*buf))
320 return -EINVAL;
321
c8b91acc 322 error = fd_statfs(fd, &tmp);
86e07ce7
DG		 323 if (!error)
324 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 325 return error;
326}
327
2b1c6bd7
CH		 328/*
329 * This is a copy of sys_ustat, just dealing with a structure layout.
330 * Given how simple this syscall is that apporach is more maintainable
331 * than the various conversion hacks.
332 */
333asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
334{
2b1c6bd7
CH		 335 struct compat_ustat tmp;
336 struct kstatfs sbuf;
cf31e70d 337 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
2b1c6bd7
CH		 338 if (err)
339 return err;
340
341 memset(&tmp, 0, sizeof(struct compat_ustat));
342 tmp.f_tfree = sbuf.f_bfree;
343 tmp.f_tinode = sbuf.f_ffree;
344 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
345 return -EFAULT;
346 return 0;
347}
348
1da177e4
LT		 349static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
350{
351 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
352 __get_user(kfl->l_type, &ufl->l_type) ||
353 __get_user(kfl->l_whence, &ufl->l_whence) ||
354 __get_user(kfl->l_start, &ufl->l_start) ||
355 __get_user(kfl->l_len, &ufl->l_len) ||
356 __get_user(kfl->l_pid, &ufl->l_pid))
357 return -EFAULT;
358 return 0;
359}
360
361static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
362{
363 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
364 __put_user(kfl->l_type, &ufl->l_type) ||
365 __put_user(kfl->l_whence, &ufl->l_whence) ||
366 __put_user(kfl->l_start, &ufl->l_start) ||
367 __put_user(kfl->l_len, &ufl->l_len) ||
368 __put_user(kfl->l_pid, &ufl->l_pid))
369 return -EFAULT;
370 return 0;
371}
372
373#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
374static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
375{
376 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
377 __get_user(kfl->l_type, &ufl->l_type) ||
378 __get_user(kfl->l_whence, &ufl->l_whence) ||
379 __get_user(kfl->l_start, &ufl->l_start) ||
380 __get_user(kfl->l_len, &ufl->l_len) ||
381 __get_user(kfl->l_pid, &ufl->l_pid))
382 return -EFAULT;
383 return 0;
384}
385#endif
386
387#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
388static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
389{
390 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
391 __put_user(kfl->l_type, &ufl->l_type) ||
392 __put_user(kfl->l_whence, &ufl->l_whence) ||
393 __put_user(kfl->l_start, &ufl->l_start) ||
394 __put_user(kfl->l_len, &ufl->l_len) ||
395 __put_user(kfl->l_pid, &ufl->l_pid))
396 return -EFAULT;
397 return 0;
398}
399#endif
400
401asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
402 unsigned long arg)
403{
404 mm_segment_t old_fs;
405 struct flock f;
406 long ret;
407
408 switch (cmd) {
409 case F_GETLK:
410 case F_SETLK:
411 case F_SETLKW:
412 ret = get_compat_flock(&f, compat_ptr(arg));
413 if (ret != 0)
414 break;
415 old_fs = get_fs();
416 set_fs(KERNEL_DS);
417 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
418 set_fs(old_fs);
419 if (cmd == F_GETLK && ret == 0) {
ff677f8d 420 /* GETLK was successful and we need to return the data...
2520f14c
N		 421 * but it needs to fit in the compat structure.
422 * l_start shouldn't be too big, unless the original
423 * start + end is greater than COMPAT_OFF_T_MAX, in which
424 * case the app was asking for trouble, so we return
425 * -EOVERFLOW in that case.
426 * l_len could be too big, in which case we just truncate it,
427 * and only allow the app to see that part of the conflicting
428 * lock that might make sense to it anyway
429 */
430
431 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 432 ret = -EOVERFLOW;
2520f14c
N		 433 if (f.l_len > COMPAT_OFF_T_MAX)
434 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 435 if (ret == 0)
436 ret = put_compat_flock(&f, compat_ptr(arg));
437 }
438 break;
439
440 case F_GETLK64:
441 case F_SETLK64:
442 case F_SETLKW64:
443 ret = get_compat_flock64(&f, compat_ptr(arg));
444 if (ret != 0)
445 break;
446 old_fs = get_fs();
447 set_fs(KERNEL_DS);
448 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
449 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
450 (unsigned long)&f);
451 set_fs(old_fs);
452 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 453 /* need to return lock information - see above for commentary */
454 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 455 ret = -EOVERFLOW;
2520f14c
N		 456 if (f.l_len > COMPAT_LOFF_T_MAX)
457 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 458 if (ret == 0)
459 ret = put_compat_flock64(&f, compat_ptr(arg));
460 }
461 break;
462
463 default:
464 ret = sys_fcntl(fd, cmd, arg);
465 break;
466 }
467 return ret;
468}
469
470asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
471 unsigned long arg)
472{
473 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
474 return -EINVAL;
475 return compat_sys_fcntl64(fd, cmd, arg);
476}
477
478asmlinkage long
479compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
480{
481 long ret;
482 aio_context_t ctx64;
483
484 mm_segment_t oldfs = get_fs();
485 if (unlikely(get_user(ctx64, ctx32p)))
486 return -EFAULT;
487
488 set_fs(KERNEL_DS);
489 /* The __user pointer cast is valid because of the set_fs() */
490 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
491 set_fs(oldfs);
492 /* truncating is ok because it's a user address */
493 if (!ret)
494 ret = put_user((u32) ctx64, ctx32p);
495 return ret;
496}
497
498asmlinkage long
499compat_sys_io_getevents(aio_context_t ctx_id,
500 unsigned long min_nr,
501 unsigned long nr,
502 struct io_event __user *events,
503 struct compat_timespec __user *timeout)
504{
505 long ret;
506 struct timespec t;
507 struct timespec __user *ut = NULL;
508
509 ret = -EFAULT;
510 if (unlikely(!access_ok(VERIFY_WRITE, events,
511 nr * sizeof(struct io_event))))
512 goto out;
513 if (timeout) {
514 if (get_compat_timespec(&t, timeout))
515 goto out;
516
517 ut = compat_alloc_user_space(sizeof(*ut));
518 if (copy_to_user(ut, &t, sizeof(t)) )
519 goto out;
520 }
521 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
522out:
523 return ret;
524}
525
b8373363
JM		 526/* A write operation does a read from user space and vice versa */
527#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
528
529ssize_t compat_rw_copy_check_uvector(int type,
530 const struct compat_iovec __user *uvector, unsigned long nr_segs,
531 unsigned long fast_segs, struct iovec *fast_pointer,
ac34ebb3 532 struct iovec **ret_pointer)
b8373363
JM		 533{
534 compat_ssize_t tot_len;
535 struct iovec *iov = *ret_pointer = fast_pointer;
536 ssize_t ret = 0;
537 int seg;
538
539 /*
540 * SuS says "The readv() function *may* fail if the iovcnt argument
541 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
542 * traditionally returned zero for zero segments, so...
543 */
544 if (nr_segs == 0)
545 goto out;
546
547 ret = -EINVAL;
548 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
549 goto out;
550 if (nr_segs > fast_segs) {
551 ret = -ENOMEM;
552 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
6a5640f1 553 if (iov == NULL)
b8373363 554 goto out;
b8373363
JM		 555 }
556 *ret_pointer = iov;
557
8aec0f5d
MD		 558 ret = -EFAULT;
559 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
560 goto out;
561
b8373363
JM		 562 /*
563 * Single unix specification:
564 * We should -EINVAL if an element length is not >= 0 and fitting an
435f49a5 565 * ssize_t.
b8373363 566 *
435f49a5
LT		 567 * In Linux, the total length is limited to MAX_RW_COUNT, there is
568 * no overflow possibility.
b8373363
JM		 569 */
570 tot_len = 0;
571 ret = -EINVAL;
572 for (seg = 0; seg < nr_segs; seg++) {
b8373363
JM		 573 compat_uptr_t buf;
574 compat_ssize_t len;
575
576 if (__get_user(len, &uvector->iov_len) ||
577 __get_user(buf, &uvector->iov_base)) {
578 ret = -EFAULT;
579 goto out;
580 }
581 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
582 goto out;
ac34ebb3 583 if (type >= 0 &&
fcf63409 584 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
b8373363
JM		 585 ret = -EFAULT;
586 goto out;
587 }
435f49a5
LT		 588 if (len > MAX_RW_COUNT - tot_len)
589 len = MAX_RW_COUNT - tot_len;
590 tot_len += len;
b8373363
JM		 591 iov->iov_base = compat_ptr(buf);
592 iov->iov_len = (compat_size_t) len;
593 uvector++;
594 iov++;
595 }
596 ret = tot_len;
597
598out:
599 return ret;
600}
601
1da177e4
LT		 602static inline long
603copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
604{
605 compat_uptr_t uptr;
606 int i;
607
608 for (i = 0; i < nr; ++i) {
609 if (get_user(uptr, ptr32 + i))
610 return -EFAULT;
611 if (put_user(compat_ptr(uptr), ptr64 + i))
612 return -EFAULT;
613 }
614 return 0;
615}
616
617#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
618
619asmlinkage long
620compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
621{
622 struct iocb __user * __user *iocb64;
623 long ret;
624
625 if (unlikely(nr < 0))
626 return -EINVAL;
627
628 if (nr > MAX_AIO_SUBMITS)
629 nr = MAX_AIO_SUBMITS;
630
631 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
632 ret = copy_iocb(nr, iocb, iocb64);
633 if (!ret)
9d85cba7 634 ret = do_io_submit(ctx_id, nr, iocb64, 1);
1da177e4
LT		 635 return ret;
636}
637
638struct compat_ncp_mount_data {
639 compat_int_t version;
640 compat_uint_t ncp_fd;
202e5979 641 __compat_uid_t mounted_uid;
1da177e4
LT		 642 compat_pid_t wdog_pid;
643 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
644 compat_uint_t time_out;
645 compat_uint_t retry_count;
646 compat_uint_t flags;
202e5979
SR		 647 __compat_uid_t uid;
648 __compat_gid_t gid;
1da177e4
LT		 649 compat_mode_t file_mode;
650 compat_mode_t dir_mode;
651};
652
653struct compat_ncp_mount_data_v4 {
654 compat_int_t version;
655 compat_ulong_t flags;
656 compat_ulong_t mounted_uid;
657 compat_long_t wdog_pid;
658 compat_uint_t ncp_fd;
659 compat_uint_t time_out;
660 compat_uint_t retry_count;
661 compat_ulong_t uid;
662 compat_ulong_t gid;
663 compat_ulong_t file_mode;
664 compat_ulong_t dir_mode;
665};
666
667static void *do_ncp_super_data_conv(void *raw_data)
668{
669 int version = *(unsigned int *)raw_data;
670
671 if (version == 3) {
672 struct compat_ncp_mount_data *c_n = raw_data;
673 struct ncp_mount_data *n = raw_data;
674
675 n->dir_mode = c_n->dir_mode;
676 n->file_mode = c_n->file_mode;
677 n->gid = c_n->gid;
678 n->uid = c_n->uid;
679 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
680 n->wdog_pid = c_n->wdog_pid;
681 n->mounted_uid = c_n->mounted_uid;
682 } else if (version == 4) {
683 struct compat_ncp_mount_data_v4 *c_n = raw_data;
684 struct ncp_mount_data_v4 *n = raw_data;
685
686 n->dir_mode = c_n->dir_mode;
687 n->file_mode = c_n->file_mode;
688 n->gid = c_n->gid;
689 n->uid = c_n->uid;
690 n->retry_count = c_n->retry_count;
691 n->time_out = c_n->time_out;
692 n->ncp_fd = c_n->ncp_fd;
693 n->wdog_pid = c_n->wdog_pid;
694 n->mounted_uid = c_n->mounted_uid;
695 n->flags = c_n->flags;
696 } else if (version != 5) {
697 return NULL;
698 }
699
700 return raw_data;
701}
702
1da177e4 703
9a9947bf
DH		 704struct compat_nfs_string {
705 compat_uint_t len;
5fc3e624 706 compat_uptr_t data;
9a9947bf
DH		 707};
708
709static inline void compat_nfs_string(struct nfs_string *dst,
710 struct compat_nfs_string *src)
711{
712 dst->data = compat_ptr(src->data);
713 dst->len = src->len;
714}
715
716struct compat_nfs4_mount_data_v1 {
717 compat_int_t version;
718 compat_int_t flags;
719 compat_int_t rsize;
720 compat_int_t wsize;
721 compat_int_t timeo;
722 compat_int_t retrans;
723 compat_int_t acregmin;
724 compat_int_t acregmax;
725 compat_int_t acdirmin;
726 compat_int_t acdirmax;
727 struct compat_nfs_string client_addr;
728 struct compat_nfs_string mnt_path;
729 struct compat_nfs_string hostname;
730 compat_uint_t host_addrlen;
5fc3e624 731 compat_uptr_t host_addr;
9a9947bf
DH		 732 compat_int_t proto;
733 compat_int_t auth_flavourlen;
5fc3e624 734 compat_uptr_t auth_flavours;
9a9947bf
DH		 735};
736
737static int do_nfs4_super_data_conv(void *raw_data)
738{
739 int version = *(compat_uint_t *) raw_data;
740
741 if (version == 1) {
742 struct compat_nfs4_mount_data_v1 *raw = raw_data;
743 struct nfs4_mount_data *real = raw_data;
744
745 /* copy the fields backwards */
746 real->auth_flavours = compat_ptr(raw->auth_flavours);
747 real->auth_flavourlen = raw->auth_flavourlen;
748 real->proto = raw->proto;
749 real->host_addr = compat_ptr(raw->host_addr);
750 real->host_addrlen = raw->host_addrlen;
751 compat_nfs_string(&real->hostname, &raw->hostname);
752 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
753 compat_nfs_string(&real->client_addr, &raw->client_addr);
754 real->acdirmax = raw->acdirmax;
755 real->acdirmin = raw->acdirmin;
756 real->acregmax = raw->acregmax;
757 real->acregmin = raw->acregmin;
758 real->retrans = raw->retrans;
759 real->timeo = raw->timeo;
760 real->wsize = raw->wsize;
761 real->rsize = raw->rsize;
762 real->flags = raw->flags;
763 real->version = raw->version;
764 }
9a9947bf
DH		 765
766 return 0;
767}
768
1da177e4 769#define NCPFS_NAME "ncpfs"
9a9947bf 770#define NFS4_NAME "nfs4"
1da177e4 771
c7887325
DH		 772asmlinkage long compat_sys_mount(const char __user * dev_name,
773 const char __user * dir_name,
774 const char __user * type, unsigned long flags,
775 const void __user * data)
1da177e4 776{
eca6f534 777 char *kernel_type;
1da177e4 778 unsigned long data_page;
eca6f534 779 char *kernel_dev;
91a27b2a 780 struct filename *dir;
1da177e4
LT		 781 int retval;
782
eca6f534 783 retval = copy_mount_string(type, &kernel_type);
1da177e4
LT		 784 if (retval < 0)
785 goto out;
786
91a27b2a
JL		 787 dir = getname(dir_name);
788 retval = PTR_ERR(dir);
789 if (IS_ERR(dir))
1da177e4
LT		 790 goto out1;
791
eca6f534 792 retval = copy_mount_string(dev_name, &kernel_dev);
1da177e4
LT		 793 if (retval < 0)
794 goto out2;
795
eca6f534 796 retval = copy_mount_options(data, &data_page);
1da177e4
LT		 797 if (retval < 0)
798 goto out3;
799
800 retval = -EINVAL;
801
eca6f534 802 if (kernel_type && data_page) {
2116b7a4 803 if (!strcmp(kernel_type, NCPFS_NAME)) {
1da177e4 804 do_ncp_super_data_conv((void *)data_page);
eca6f534 805 } else if (!strcmp(kernel_type, NFS4_NAME)) {
9a9947bf
DH		 806 if (do_nfs4_super_data_conv((void *) data_page))
807 goto out4;
1da177e4
LT		 808 }
809 }
810
91a27b2a 811 retval = do_mount(kernel_dev, dir->name, kernel_type,
1da177e4 812 flags, (void*)data_page);
1da177e4 813
9a9947bf 814 out4:
1da177e4
LT		 815 free_page(data_page);
816 out3:
eca6f534 817 kfree(kernel_dev);
1da177e4 818 out2:
91a27b2a 819 putname(dir);
1da177e4 820 out1:
eca6f534 821 kfree(kernel_type);
1da177e4
LT		 822 out:
823 return retval;
824}
825
1da177e4
LT		 826struct compat_old_linux_dirent {
827 compat_ulong_t d_ino;
828 compat_ulong_t d_offset;
829 unsigned short d_namlen;
830 char d_name[1];
831};
832
833struct compat_readdir_callback {
834 struct compat_old_linux_dirent __user *dirent;
835 int result;
836};
837
838static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 839 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 840{
841 struct compat_readdir_callback *buf = __buf;
842 struct compat_old_linux_dirent __user *dirent;
afefdbb2 843 compat_ulong_t d_ino;
1da177e4
LT		 844
845 if (buf->result)
846 return -EINVAL;
afefdbb2 847 d_ino = ino;
8f3f655d
AV		 848 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
849 buf->result = -EOVERFLOW;
afefdbb2 850 return -EOVERFLOW;
8f3f655d 851 }
1da177e4
LT		 852 buf->result++;
853 dirent = buf->dirent;
854 if (!access_ok(VERIFY_WRITE, dirent,
855 (unsigned long)(dirent->d_name + namlen + 1) -
856 (unsigned long)dirent))
857 goto efault;
afefdbb2 858 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 859 __put_user(offset, &dirent->d_offset) ||
860 __put_user(namlen, &dirent->d_namlen) ||
861 __copy_to_user(dirent->d_name, name, namlen) ||
862 __put_user(0, dirent->d_name + namlen))
863 goto efault;
864 return 0;
865efault:
866 buf->result = -EFAULT;
867 return -EFAULT;
868}
869
870asmlinkage long compat_sys_old_readdir(unsigned int fd,
871 struct compat_old_linux_dirent __user *dirent, unsigned int count)
872{
873 int error;
2903ff01 874 struct fd f = fdget(fd);
1da177e4
LT		 875 struct compat_readdir_callback buf;
876
2903ff01 877 if (!f.file)
863ced7f 878 return -EBADF;
1da177e4
LT		 879
880 buf.result = 0;
881 buf.dirent = dirent;
882
2903ff01 883 error = vfs_readdir(f.file, compat_fillonedir, &buf);
53c9c5c0 884 if (buf.result)
1da177e4
LT		 885 error = buf.result;
886
2903ff01 887 fdput(f);
1da177e4
LT		 888 return error;
889}
890
891struct compat_linux_dirent {
892 compat_ulong_t d_ino;
893 compat_ulong_t d_off;
894 unsigned short d_reclen;
895 char d_name[1];
896};
897
898struct compat_getdents_callback {
899 struct compat_linux_dirent __user *current_dir;
900 struct compat_linux_dirent __user *previous;
901 int count;
902 int error;
903};
904
905static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 906 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 907{
908 struct compat_linux_dirent __user * dirent;
909 struct compat_getdents_callback *buf = __buf;
afefdbb2 910 compat_ulong_t d_ino;
85c9fe8f
KW		 911 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
912 namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 913
914 buf->error = -EINVAL; /* only used if we fail.. */
915 if (reclen > buf->count)
916 return -EINVAL;
afefdbb2 917 d_ino = ino;
8f3f655d
AV		 918 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
919 buf->error = -EOVERFLOW;
afefdbb2 920 return -EOVERFLOW;
8f3f655d 921 }
1da177e4
LT		 922 dirent = buf->previous;
923 if (dirent) {
924 if (__put_user(offset, &dirent->d_off))
925 goto efault;
926 }
927 dirent = buf->current_dir;
afefdbb2 928 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 929 goto efault;
930 if (__put_user(reclen, &dirent->d_reclen))
931 goto efault;
932 if (copy_to_user(dirent->d_name, name, namlen))
933 goto efault;
934 if (__put_user(0, dirent->d_name + namlen))
935 goto efault;
936 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
937 goto efault;
938 buf->previous = dirent;
939 dirent = (void __user *)dirent + reclen;
940 buf->current_dir = dirent;
941 buf->count -= reclen;
942 return 0;
943efault:
944 buf->error = -EFAULT;
945 return -EFAULT;
946}
947
948asmlinkage long compat_sys_getdents(unsigned int fd,
949 struct compat_linux_dirent __user *dirent, unsigned int count)
950{
2903ff01 951 struct fd f;
1da177e4
LT		 952 struct compat_linux_dirent __user * lastdirent;
953 struct compat_getdents_callback buf;
954 int error;
955
1da177e4 956 if (!access_ok(VERIFY_WRITE, dirent, count))
863ced7f 957 return -EFAULT;
1da177e4 958
2903ff01
AV		 959 f = fdget(fd);
960 if (!f.file)
863ced7f 961 return -EBADF;
1da177e4
LT		 962
963 buf.current_dir = dirent;
964 buf.previous = NULL;
965 buf.count = count;
966 buf.error = 0;
967
2903ff01 968 error = vfs_readdir(f.file, compat_filldir, &buf);
53c9c5c0
AV		 969 if (error >= 0)
970 error = buf.error;
1da177e4
LT		 971 lastdirent = buf.previous;
972 if (lastdirent) {
2903ff01 973 if (put_user(f.file->f_pos, &lastdirent->d_off))
1da177e4
LT		 974 error = -EFAULT;
975 else
976 error = count - buf.count;
977 }
2903ff01 978 fdput(f);
1da177e4
LT		 979 return error;
980}
981
982#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 983
984struct compat_getdents_callback64 {
985 struct linux_dirent64 __user *current_dir;
986 struct linux_dirent64 __user *previous;
987 int count;
988 int error;
989};
990
991static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 992 u64 ino, unsigned int d_type)
1da177e4
LT		 993{
994 struct linux_dirent64 __user *dirent;
995 struct compat_getdents_callback64 *buf = __buf;
85c9fe8f
KW		 996 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
997 sizeof(u64));
1da177e4
LT		 998 u64 off;
999
1000 buf->error = -EINVAL; /* only used if we fail.. */
1001 if (reclen > buf->count)
1002 return -EINVAL;
1003 dirent = buf->previous;
1004
1005 if (dirent) {
1006 if (__put_user_unaligned(offset, &dirent->d_off))
1007 goto efault;
1008 }
1009 dirent = buf->current_dir;
1010 if (__put_user_unaligned(ino, &dirent->d_ino))
1011 goto efault;
1012 off = 0;
1013 if (__put_user_unaligned(off, &dirent->d_off))
1014 goto efault;
1015 if (__put_user(reclen, &dirent->d_reclen))
1016 goto efault;
1017 if (__put_user(d_type, &dirent->d_type))
1018 goto efault;
1019 if (copy_to_user(dirent->d_name, name, namlen))
1020 goto efault;
1021 if (__put_user(0, dirent->d_name + namlen))
1022 goto efault;
1023 buf->previous = dirent;
1024 dirent = (void __user *)dirent + reclen;
1025 buf->current_dir = dirent;
1026 buf->count -= reclen;
1027 return 0;
1028efault:
1029 buf->error = -EFAULT;
1030 return -EFAULT;
1031}
1032
1033asmlinkage long compat_sys_getdents64(unsigned int fd,
1034 struct linux_dirent64 __user * dirent, unsigned int count)
1035{
2903ff01 1036 struct fd f;
1da177e4
LT		 1037 struct linux_dirent64 __user * lastdirent;
1038 struct compat_getdents_callback64 buf;
1039 int error;
1040
1da177e4 1041 if (!access_ok(VERIFY_WRITE, dirent, count))
863ced7f 1042 return -EFAULT;
1da177e4 1043
2903ff01
AV		 1044 f = fdget(fd);
1045 if (!f.file)
863ced7f 1046 return -EBADF;
1da177e4
LT		 1047
1048 buf.current_dir = dirent;
1049 buf.previous = NULL;
1050 buf.count = count;
1051 buf.error = 0;
1052
2903ff01 1053 error = vfs_readdir(f.file, compat_filldir64, &buf);
53c9c5c0
AV		 1054 if (error >= 0)
1055 error = buf.error;
1da177e4
LT		 1056 lastdirent = buf.previous;
1057 if (lastdirent) {
2903ff01 1058 typeof(lastdirent->d_off) d_off = f.file->f_pos;
7116e994 1059 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1060 error = -EFAULT;
1061 else
1062 error = count - buf.count;
1da177e4 1063 }
2903ff01 1064 fdput(f);
1da177e4
LT		 1065 return error;
1066}
1067#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1068
e922efc3
MS		 1069/*
1070 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1071 * O_LARGEFILE flag.
1072 */
f482e1b4 1073COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
e922efc3 1074{
5590ff0d
UD		 1075 return do_sys_open(AT_FDCWD, filename, flags, mode);
1076}
1077
1078/*
1079 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1080 * O_LARGEFILE flag.
1081 */
f482e1b4 1082COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
5590ff0d
UD		 1083{
1084 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1085}
1086
1da177e4
LT		 1087#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1088
b773ad40
TG		 1089static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1090 int timeval, int ret)
1091{
1092 struct timespec ts;
1093
1094 if (!p)
1095 return ret;
1096
1097 if (current->personality & STICKY_TIMEOUTS)
1098 goto sticky;
1099
1100 /* No update for zero timeout */
1101 if (!end_time->tv_sec && !end_time->tv_nsec)
1102 return ret;
1103
1104 ktime_get_ts(&ts);
1105 ts = timespec_sub(*end_time, ts);
1106 if (ts.tv_sec < 0)
1107 ts.tv_sec = ts.tv_nsec = 0;
1108
1109 if (timeval) {
1110 struct compat_timeval rtv;
1111
1112 rtv.tv_sec = ts.tv_sec;
1113 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1114
1115 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1116 return ret;
1117 } else {
1118 struct compat_timespec rts;
1119
1120 rts.tv_sec = ts.tv_sec;
1121 rts.tv_nsec = ts.tv_nsec;
1122
1123 if (!copy_to_user(p, &rts, sizeof(rts)))
1124 return ret;
1125 }
1126 /*
1127 * If an application puts its timeval in read-only memory, we
1128 * don't want the Linux-specific update to the timeval to
1129 * cause a fault after the select has completed
1130 * successfully. However, because we're not updating the
1131 * timeval, we can't restart the system call.
1132 */
1133
1134sticky:
1135 if (ret == -ERESTARTNOHAND)
1136 ret = -EINTR;
1137 return ret;
1138}
1139
1da177e4
LT		 1140/*
1141 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1142 * 64-bit unsigned longs.
1143 */
858119e1 1144static
1da177e4
LT		 1145int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1146 unsigned long *fdset)
1147{
022a1692 1148 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1149 if (ufdset) {
1150 unsigned long odd;
1151
1152 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1153 return -EFAULT;
1154
1155 odd = nr & 1UL;
1156 nr &= ~1UL;
1157 while (nr) {
1158 unsigned long h, l;
7116e994
HC		 1159 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1160 return -EFAULT;
1da177e4
LT		 1161 ufdset += 2;
1162 *fdset++ = h << 32 | l;
1163 nr -= 2;
1164 }
7116e994
HC		 1165 if (odd && __get_user(*fdset, ufdset))
1166 return -EFAULT;
1da177e4
LT		 1167 } else {
1168 /* Tricky, must clear full unsigned long in the
1169 * kernel fdset at the end, this makes sure that
1170 * actually happens.
1171 */
1172 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1173 }
1174 return 0;
1175}
1176
858119e1 1177static
7116e994
HC		 1178int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1179 unsigned long *fdset)
1da177e4
LT		 1180{
1181 unsigned long odd;
022a1692 1182 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1183
1184 if (!ufdset)
7116e994 1185 return 0;
1da177e4
LT		 1186
1187 odd = nr & 1UL;
1188 nr &= ~1UL;
1189 while (nr) {
1190 unsigned long h, l;
1191 l = *fdset++;
1192 h = l >> 32;
7116e994
HC		 1193 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1194 return -EFAULT;
1da177e4
LT		 1195 ufdset += 2;
1196 nr -= 2;
1197 }
7116e994
HC		 1198 if (odd && __put_user(*fdset, ufdset))
1199 return -EFAULT;
1200 return 0;
1da177e4
LT		 1201}
1202
1203
1204/*
1205 * This is a virtual copy of sys_select from fs/select.c and probably
1206 * should be compared to it from time to time
1207 */
1da177e4
LT		 1208
1209/*
1210 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1211 * like to be certain this leads to no problems. So I return
1212 * EINTR just for safety.
1213 *
1214 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1215 * I'm trying ERESTARTNOHAND which restart only when you want to.
1216 */
9f72949f 1217int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1218 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1219 struct timespec *end_time)
1da177e4
LT		 1220{
1221 fd_set_bits fds;
6087b2da 1222 void *bits;
bbea9f69 1223 int size, max_fds, ret = -EINVAL;
a4531edd 1224 struct fdtable *fdt;
6087b2da 1225 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1226
1da177e4
LT		 1227 if (n < 0)
1228 goto out_nofds;
1229
bbea9f69 1230 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1231 rcu_read_lock();
a4531edd 1232 fdt = files_fdtable(current->files);
bbea9f69 1233 max_fds = fdt->max_fds;
ac5b8b6f 1234 rcu_read_unlock();
bbea9f69
VL		 1235 if (n > max_fds)
1236 n = max_fds;
1da177e4
LT		 1237
1238 /*
1239 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1240 * since we used fdset we need to allocate memory in units of
1241 * long-words.
1242 */
1da177e4 1243 size = FDS_BYTES(n);
6087b2da
BP		 1244 bits = stack_fds;
1245 if (size > sizeof(stack_fds) / 6) {
1246 bits = kmalloc(6 * size, GFP_KERNEL);
1247 ret = -ENOMEM;
1248 if (!bits)
1249 goto out_nofds;
1250 }
1da177e4
LT		 1251 fds.in = (unsigned long *) bits;
1252 fds.out = (unsigned long *) (bits + size);
1253 fds.ex = (unsigned long *) (bits + 2*size);
1254 fds.res_in = (unsigned long *) (bits + 3*size);
1255 fds.res_out = (unsigned long *) (bits + 4*size);
1256 fds.res_ex = (unsigned long *) (bits + 5*size);
1257
1258 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1259 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1260 (ret = compat_get_fd_set(n, exp, fds.ex)))
1261 goto out;
1262 zero_fd_set(n, fds.res_in);
1263 zero_fd_set(n, fds.res_out);
1264 zero_fd_set(n, fds.res_ex);
1265
8ff3e8e8 1266 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1267
1268 if (ret < 0)
1269 goto out;
1270 if (!ret) {
1271 ret = -ERESTARTNOHAND;
1272 if (signal_pending(current))
1273 goto out;
1274 ret = 0;
1275 }
1276
7116e994
HC		 1277 if (compat_set_fd_set(n, inp, fds.res_in) ||
1278 compat_set_fd_set(n, outp, fds.res_out) ||
1279 compat_set_fd_set(n, exp, fds.res_ex))
1280 ret = -EFAULT;
1da177e4 1281out:
6087b2da
BP		 1282 if (bits != stack_fds)
1283 kfree(bits);
1da177e4
LT		 1284out_nofds:
1285 return ret;
1286}
1287
9f72949f
DW		 1288asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1289 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1290 struct compat_timeval __user *tvp)
1291{
8ff3e8e8 1292 struct timespec end_time, *to = NULL;
9f72949f
DW		 1293 struct compat_timeval tv;
1294 int ret;
1295
1296 if (tvp) {
1297 if (copy_from_user(&tv, tvp, sizeof(tv)))
1298 return -EFAULT;
1299
8ff3e8e8 1300 to = &end_time;
4d36a9e6
AV		 1301 if (poll_select_set_timeout(to,
1302 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1303 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1304 return -EINVAL;
9f72949f
DW		 1305 }
1306
8ff3e8e8
AV		 1307 ret = compat_core_sys_select(n, inp, outp, exp, to);
1308 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1309
1310 return ret;
1311}
1312
5d0e5283
CH		 1313struct compat_sel_arg_struct {
1314 compat_ulong_t n;
1315 compat_uptr_t inp;
1316 compat_uptr_t outp;
1317 compat_uptr_t exp;
1318 compat_uptr_t tvp;
1319};
1320
1321asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1322{
1323 struct compat_sel_arg_struct a;
1324
1325 if (copy_from_user(&a, arg, sizeof(a)))
1326 return -EFAULT;
1327 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1328 compat_ptr(a.exp), compat_ptr(a.tvp));
1329}
1330
c9da9f21 1331static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1332 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1333 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1334 compat_size_t sigsetsize)
1335{
1336 compat_sigset_t ss32;
1337 sigset_t ksigmask, sigsaved;
9f72949f 1338 struct compat_timespec ts;
8ff3e8e8 1339 struct timespec end_time, *to = NULL;
9f72949f
DW		 1340 int ret;
1341
1342 if (tsp) {
1343 if (copy_from_user(&ts, tsp, sizeof(ts)))
1344 return -EFAULT;
1345
8ff3e8e8
AV		 1346 to = &end_time;
1347 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1348 return -EINVAL;
1349 }
1350
1351 if (sigmask) {
1352 if (sigsetsize != sizeof(compat_sigset_t))
1353 return -EINVAL;
1354 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1355 return -EFAULT;
1356 sigset_from_compat(&ksigmask, &ss32);
1357
1358 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1359 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1360 }
1361
8ff3e8e8
AV		 1362 ret = compat_core_sys_select(n, inp, outp, exp, to);
1363 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1364
1365 if (ret == -ERESTARTNOHAND) {
1366 /*
1367 * Don't restore the signal mask yet. Let do_signal() deliver
1368 * the signal on the way back to userspace, before the signal
1369 * mask is restored.
1370 */
1371 if (sigmask) {
1372 memcpy(&current->saved_sigmask, &sigsaved,
1373 sizeof(sigsaved));
4e4c22c7 1374 set_restore_sigmask();
9f72949f
DW		 1375 }
1376 } else if (sigmask)
1377 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1378
1379 return ret;
1380}
1381
1382asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1383 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1384 struct compat_timespec __user *tsp, void __user *sig)
1385{
1386 compat_size_t sigsetsize = 0;
1387 compat_uptr_t up = 0;
1388
1389 if (sig) {
1390 if (!access_ok(VERIFY_READ, sig,
1391 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1392 __get_user(up, (compat_uptr_t __user *)sig) ||
1393 __get_user(sigsetsize,
1394 (compat_size_t __user *)(sig+sizeof(up))))
1395 return -EFAULT;
1396 }
c9da9f21
HC		 1397 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1398 sigsetsize);
9f72949f
DW		 1399}
1400
1401asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1402 unsigned int nfds, struct compat_timespec __user *tsp,
1403 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1404{
1405 compat_sigset_t ss32;
1406 sigset_t ksigmask, sigsaved;
1407 struct compat_timespec ts;
8ff3e8e8 1408 struct timespec end_time, *to = NULL;
9f72949f
DW		 1409 int ret;
1410
1411 if (tsp) {
1412 if (copy_from_user(&ts, tsp, sizeof(ts)))
1413 return -EFAULT;
1414
8ff3e8e8
AV		 1415 to = &end_time;
1416 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1417 return -EINVAL;
9f72949f
DW		 1418 }
1419
1420 if (sigmask) {
3835a9bd 1421 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1422 return -EINVAL;
1423 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1424 return -EFAULT;
1425 sigset_from_compat(&ksigmask, &ss32);
1426
1427 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1428 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1429 }
1430
8ff3e8e8 1431 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1432
1433 /* We can restart this syscall, usually */
1434 if (ret == -EINTR) {
1435 /*
1436 * Don't restore the signal mask yet. Let do_signal() deliver
1437 * the signal on the way back to userspace, before the signal
1438 * mask is restored.
1439 */
1440 if (sigmask) {
1441 memcpy(&current->saved_sigmask, &sigsaved,
1442 sizeof(sigsaved));
4e4c22c7 1443 set_restore_sigmask();
9f72949f
DW		 1444 }
1445 ret = -ERESTARTNOHAND;
1446 } else if (sigmask)
1447 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1448
8ff3e8e8 1449 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1450
1451 return ret;
1452}
9f72949f 1453
becfd1f3
AK		 1454#ifdef CONFIG_FHANDLE
1455/*
1456 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1457 * doesn't set the O_LARGEFILE flag.
1458 */
f482e1b4
AV		 1459COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1460 struct file_handle __user *, handle, int, flags)
becfd1f3
AK		 1461{
1462 return do_handle_open(mountdirfd, handle, flags);
1463}
1464#endif