Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/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 <linux/uaccess.h>
 53 #include <asm/mmu_context.h>
 54 #include <asm/ioctls.h>
 55 #include "internal.h"
 56 
 57 /*
 58  * Not all architectures have sys_utime, so implement this in terms
 59  * of sys_utimes.
 60  */
 61 COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
 62                        struct compat_utimbuf __user *, t)
 63 {
 64         struct timespec tv[2];
 65 
 66         if (t) {
 67                 if (get_user(tv[0].tv_sec, &t->actime) ||
 68                     get_user(tv[1].tv_sec, &t->modtime))
 69                         return -EFAULT;
 70                 tv[0].tv_nsec = 0;
 71                 tv[1].tv_nsec = 0;
 72         }
 73         return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
 74 }
 75 
 76 COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags)
 77 {
 78         struct timespec tv[2];
 79 
 80         if  (t) {
 81                 if (compat_get_timespec(&tv[0], &t[0]) ||
 82                     compat_get_timespec(&tv[1], &t[1]))
 83                         return -EFAULT;
 84 
 85                 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
 86                         return 0;
 87         }
 88         return do_utimes(dfd, filename, t ? tv : NULL, flags);
 89 }
 90 
 91 COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t)
 92 {
 93         struct timespec tv[2];
 94 
 95         if (t) {
 96                 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
 97                     get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
 98                     get_user(tv[1].tv_sec, &t[1].tv_sec) ||
 99                     get_user(tv[1].tv_nsec, &t[1].tv_usec))
100                         return -EFAULT;
101                 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
102                     tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
103                         return -EINVAL;
104                 tv[0].tv_nsec *= 1000;
105                 tv[1].tv_nsec *= 1000;
106         }
107         return do_utimes(dfd, filename, t ? tv : NULL, 0);
108 }
109 
110 COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
111 {
112         return compat_sys_futimesat(AT_FDCWD, filename, t);
113 }
114 
115 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
116 {
117         struct compat_stat tmp;
118 
119         if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
120                 return -EOVERFLOW;
121 
122         memset(&tmp, 0, sizeof(tmp));
123         tmp.st_dev = old_encode_dev(stat->dev);
124         tmp.st_ino = stat->ino;
125         if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
126                 return -EOVERFLOW;
127         tmp.st_mode = stat->mode;
128         tmp.st_nlink = stat->nlink;
129         if (tmp.st_nlink != stat->nlink)
130                 return -EOVERFLOW;
131         SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
132         SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
133         tmp.st_rdev = old_encode_dev(stat->rdev);
134         if ((u64) stat->size > MAX_NON_LFS)
135                 return -EOVERFLOW;
136         tmp.st_size = stat->size;
137         tmp.st_atime = stat->atime.tv_sec;
138         tmp.st_atime_nsec = stat->atime.tv_nsec;
139         tmp.st_mtime = stat->mtime.tv_sec;
140         tmp.st_mtime_nsec = stat->mtime.tv_nsec;
141         tmp.st_ctime = stat->ctime.tv_sec;
142         tmp.st_ctime_nsec = stat->ctime.tv_nsec;
143         tmp.st_blocks = stat->blocks;
144         tmp.st_blksize = stat->blksize;
145         return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
146 }
147 
148 COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
149                        struct compat_stat __user *, statbuf)
150 {
151         struct kstat stat;
152         int error;
153 
154         error = vfs_stat(filename, &stat);
155         if (error)
156                 return error;
157         return cp_compat_stat(&stat, statbuf);
158 }
159 
160 COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
161                        struct compat_stat __user *, statbuf)
162 {
163         struct kstat stat;
164         int error;
165 
166         error = vfs_lstat(filename, &stat);
167         if (error)
168                 return error;
169         return cp_compat_stat(&stat, statbuf);
170 }
171 
172 #ifndef __ARCH_WANT_STAT64
173 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
174                        const char __user *, filename,
175                        struct compat_stat __user *, statbuf, int, flag)
176 {
177         struct kstat stat;
178         int error;
179 
180         error = vfs_fstatat(dfd, filename, &stat, flag);
181         if (error)
182                 return error;
183         return cp_compat_stat(&stat, statbuf);
184 }
185 #endif
186 
187 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
188                        struct compat_stat __user *, statbuf)
189 {
190         struct kstat stat;
191         int error = vfs_fstat(fd, &stat);
192 
193         if (!error)
194                 error = cp_compat_stat(&stat, statbuf);
195         return error;
196 }
197 
198 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
199 {
200         
201         if (sizeof ubuf->f_blocks == 4) {
202                 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
203                      kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
204                         return -EOVERFLOW;
205                 /* f_files and f_ffree may be -1; it's okay
206                  * to stuff that into 32 bits */
207                 if (kbuf->f_files != 0xffffffffffffffffULL
208                  && (kbuf->f_files & 0xffffffff00000000ULL))
209                         return -EOVERFLOW;
210                 if (kbuf->f_ffree != 0xffffffffffffffffULL
211                  && (kbuf->f_ffree & 0xffffffff00000000ULL))
212                         return -EOVERFLOW;
213         }
214         if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
215             __put_user(kbuf->f_type, &ubuf->f_type) ||
216             __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
217             __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
218             __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
219             __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
220             __put_user(kbuf->f_files, &ubuf->f_files) ||
221             __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
222             __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
223             __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
224             __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
225             __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
226             __put_user(kbuf->f_flags, &ubuf->f_flags) ||
227             __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
228                 return -EFAULT;
229         return 0;
230 }
231 
232 /*
233  * The following statfs calls are copies of code from fs/statfs.c and
234  * should be checked against those from time to time
235  */
236 COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
237 {
238         struct kstatfs tmp;
239         int error = user_statfs(pathname, &tmp);
240         if (!error)
241                 error = put_compat_statfs(buf, &tmp);
242         return error;
243 }
244 
245 COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
246 {
247         struct kstatfs tmp;
248         int error = fd_statfs(fd, &tmp);
249         if (!error)
250                 error = put_compat_statfs(buf, &tmp);
251         return error;
252 }
253 
254 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
255 {
256         if (sizeof(ubuf->f_bsize) == 4) {
257                 if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen |
258                      kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL)
259                         return -EOVERFLOW;
260                 /* f_files and f_ffree may be -1; it's okay
261                  * to stuff that into 32 bits */
262                 if (kbuf->f_files != 0xffffffffffffffffULL
263                  && (kbuf->f_files & 0xffffffff00000000ULL))
264                         return -EOVERFLOW;
265                 if (kbuf->f_ffree != 0xffffffffffffffffULL
266                  && (kbuf->f_ffree & 0xffffffff00000000ULL))
267                         return -EOVERFLOW;
268         }
269         if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
270             __put_user(kbuf->f_type, &ubuf->f_type) ||
271             __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
272             __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
273             __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
274             __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
275             __put_user(kbuf->f_files, &ubuf->f_files) ||
276             __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
277             __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
278             __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
279             __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
280             __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
281             __put_user(kbuf->f_flags, &ubuf->f_flags) ||
282             __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
283                 return -EFAULT;
284         return 0;
285 }
286 
287 COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
288 {
289         struct kstatfs tmp;
290         int error;
291 
292         if (sz != sizeof(*buf))
293                 return -EINVAL;
294 
295         error = user_statfs(pathname, &tmp);
296         if (!error)
297                 error = put_compat_statfs64(buf, &tmp);
298         return error;
299 }
300 
301 COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, 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 = fd_statfs(fd, &tmp);
310         if (!error)
311                 error = put_compat_statfs64(buf, &tmp);
312         return error;
313 }
314 
315 /*
316  * This is a copy of sys_ustat, just dealing with a structure layout.
317  * Given how simple this syscall is that apporach is more maintainable
318  * than the various conversion hacks.
319  */
320 COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
321 {
322         struct compat_ustat tmp;
323         struct kstatfs sbuf;
324         int err = vfs_ustat(new_decode_dev(dev), &sbuf);
325         if (err)
326                 return err;
327 
328         memset(&tmp, 0, sizeof(struct compat_ustat));
329         tmp.f_tfree = sbuf.f_bfree;
330         tmp.f_tinode = sbuf.f_ffree;
331         if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
332                 return -EFAULT;
333         return 0;
334 }
335 
336 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
337 {
338         if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
339             __get_user(kfl->l_type, &ufl->l_type) ||
340             __get_user(kfl->l_whence, &ufl->l_whence) ||
341             __get_user(kfl->l_start, &ufl->l_start) ||
342             __get_user(kfl->l_len, &ufl->l_len) ||
343             __get_user(kfl->l_pid, &ufl->l_pid))
344                 return -EFAULT;
345         return 0;
346 }
347 
348 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
349 {
350         if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
351             __put_user(kfl->l_type, &ufl->l_type) ||
352             __put_user(kfl->l_whence, &ufl->l_whence) ||
353             __put_user(kfl->l_start, &ufl->l_start) ||
354             __put_user(kfl->l_len, &ufl->l_len) ||
355             __put_user(kfl->l_pid, &ufl->l_pid))
356                 return -EFAULT;
357         return 0;
358 }
359 
360 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
361 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
362 {
363         if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
364             __get_user(kfl->l_type, &ufl->l_type) ||
365             __get_user(kfl->l_whence, &ufl->l_whence) ||
366             __get_user(kfl->l_start, &ufl->l_start) ||
367             __get_user(kfl->l_len, &ufl->l_len) ||
368             __get_user(kfl->l_pid, &ufl->l_pid))
369                 return -EFAULT;
370         return 0;
371 }
372 #endif
373 
374 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
375 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
376 {
377         if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
378             __put_user(kfl->l_type, &ufl->l_type) ||
379             __put_user(kfl->l_whence, &ufl->l_whence) ||
380             __put_user(kfl->l_start, &ufl->l_start) ||
381             __put_user(kfl->l_len, &ufl->l_len) ||
382             __put_user(kfl->l_pid, &ufl->l_pid))
383                 return -EFAULT;
384         return 0;
385 }
386 #endif
387 
388 static unsigned int
389 convert_fcntl_cmd(unsigned int cmd)
390 {
391         switch (cmd) {
392         case F_GETLK64:
393                 return F_GETLK;
394         case F_SETLK64:
395                 return F_SETLK;
396         case F_SETLKW64:
397                 return F_SETLKW;
398         }
399 
400         return cmd;
401 }
402 
403 COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
404                        compat_ulong_t, arg)
405 {
406         mm_segment_t old_fs;
407         struct flock f;
408         long ret;
409         unsigned int conv_cmd;
410 
411         switch (cmd) {
412         case F_GETLK:
413         case F_SETLK:
414         case F_SETLKW:
415                 ret = get_compat_flock(&f, compat_ptr(arg));
416                 if (ret != 0)
417                         break;
418                 old_fs = get_fs();
419                 set_fs(KERNEL_DS);
420                 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
421                 set_fs(old_fs);
422                 if (cmd == F_GETLK && ret == 0) {
423                         /* GETLK was successful and we need to return the data...
424                          * but it needs to fit in the compat structure.
425                          * l_start shouldn't be too big, unless the original
426                          * start + end is greater than COMPAT_OFF_T_MAX, in which
427                          * case the app was asking for trouble, so we return
428                          * -EOVERFLOW in that case.
429                          * l_len could be too big, in which case we just truncate it,
430                          * and only allow the app to see that part of the conflicting
431                          * lock that might make sense to it anyway
432                          */
433 
434                         if (f.l_start > COMPAT_OFF_T_MAX)
435                                 ret = -EOVERFLOW;
436                         if (f.l_len > COMPAT_OFF_T_MAX)
437                                 f.l_len = COMPAT_OFF_T_MAX;
438                         if (ret == 0)
439                                 ret = put_compat_flock(&f, compat_ptr(arg));
440                 }
441                 break;
442 
443         case F_GETLK64:
444         case F_SETLK64:
445         case F_SETLKW64:
446         case F_OFD_GETLK:
447         case F_OFD_SETLK:
448         case F_OFD_SETLKW:
449                 ret = get_compat_flock64(&f, compat_ptr(arg));
450                 if (ret != 0)
451                         break;
452                 old_fs = get_fs();
453                 set_fs(KERNEL_DS);
454                 conv_cmd = convert_fcntl_cmd(cmd);
455                 ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
456                 set_fs(old_fs);
457                 if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) {
458                         /* need to return lock information - see above for commentary */
459                         if (f.l_start > COMPAT_LOFF_T_MAX)
460                                 ret = -EOVERFLOW;
461                         if (f.l_len > COMPAT_LOFF_T_MAX)
462                                 f.l_len = COMPAT_LOFF_T_MAX;
463                         if (ret == 0)
464                                 ret = put_compat_flock64(&f, compat_ptr(arg));
465                 }
466                 break;
467 
468         default:
469                 ret = sys_fcntl(fd, cmd, arg);
470                 break;
471         }
472         return ret;
473 }
474 
475 COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
476                        compat_ulong_t, arg)
477 {
478         switch (cmd) {
479         case F_GETLK64:
480         case F_SETLK64:
481         case F_SETLKW64:
482         case F_OFD_GETLK:
483         case F_OFD_SETLK:
484         case F_OFD_SETLKW:
485                 return -EINVAL;
486         }
487         return compat_sys_fcntl64(fd, cmd, arg);
488 }
489 
490 /* A write operation does a read from user space and vice versa */
491 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
492 
493 ssize_t compat_rw_copy_check_uvector(int type,
494                 const struct compat_iovec __user *uvector, unsigned long nr_segs,
495                 unsigned long fast_segs, struct iovec *fast_pointer,
496                 struct iovec **ret_pointer)
497 {
498         compat_ssize_t tot_len;
499         struct iovec *iov = *ret_pointer = fast_pointer;
500         ssize_t ret = 0;
501         int seg;
502 
503         /*
504          * SuS says "The readv() function *may* fail if the iovcnt argument
505          * was less than or equal to 0, or greater than {IOV_MAX}.  Linux has
506          * traditionally returned zero for zero segments, so...
507          */
508         if (nr_segs == 0)
509                 goto out;
510 
511         ret = -EINVAL;
512         if (nr_segs > UIO_MAXIOV)
513                 goto out;
514         if (nr_segs > fast_segs) {
515                 ret = -ENOMEM;
516                 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
517                 if (iov == NULL)
518                         goto out;
519         }
520         *ret_pointer = iov;
521 
522         ret = -EFAULT;
523         if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
524                 goto out;
525 
526         /*
527          * Single unix specification:
528          * We should -EINVAL if an element length is not >= 0 and fitting an
529          * ssize_t.
530          *
531          * In Linux, the total length is limited to MAX_RW_COUNT, there is
532          * no overflow possibility.
533          */
534         tot_len = 0;
535         ret = -EINVAL;
536         for (seg = 0; seg < nr_segs; seg++) {
537                 compat_uptr_t buf;
538                 compat_ssize_t len;
539 
540                 if (__get_user(len, &uvector->iov_len) ||
541                    __get_user(buf, &uvector->iov_base)) {
542                         ret = -EFAULT;
543                         goto out;
544                 }
545                 if (len < 0)    /* size_t not fitting in compat_ssize_t .. */
546                         goto out;
547                 if (type >= 0 &&
548                     !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
549                         ret = -EFAULT;
550                         goto out;
551                 }
552                 if (len > MAX_RW_COUNT - tot_len)
553                         len = MAX_RW_COUNT - tot_len;
554                 tot_len += len;
555                 iov->iov_base = compat_ptr(buf);
556                 iov->iov_len = (compat_size_t) len;
557                 uvector++;
558                 iov++;
559         }
560         ret = tot_len;
561 
562 out:
563         return ret;
564 }
565 
566 struct compat_ncp_mount_data {
567         compat_int_t version;
568         compat_uint_t ncp_fd;
569         __compat_uid_t mounted_uid;
570         compat_pid_t wdog_pid;
571         unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
572         compat_uint_t time_out;
573         compat_uint_t retry_count;
574         compat_uint_t flags;
575         __compat_uid_t uid;
576         __compat_gid_t gid;
577         compat_mode_t file_mode;
578         compat_mode_t dir_mode;
579 };
580 
581 struct compat_ncp_mount_data_v4 {
582         compat_int_t version;
583         compat_ulong_t flags;
584         compat_ulong_t mounted_uid;
585         compat_long_t wdog_pid;
586         compat_uint_t ncp_fd;
587         compat_uint_t time_out;
588         compat_uint_t retry_count;
589         compat_ulong_t uid;
590         compat_ulong_t gid;
591         compat_ulong_t file_mode;
592         compat_ulong_t dir_mode;
593 };
594 
595 static void *do_ncp_super_data_conv(void *raw_data)
596 {
597         int version = *(unsigned int *)raw_data;
598 
599         if (version == 3) {
600                 struct compat_ncp_mount_data *c_n = raw_data;
601                 struct ncp_mount_data *n = raw_data;
602 
603                 n->dir_mode = c_n->dir_mode;
604                 n->file_mode = c_n->file_mode;
605                 n->gid = c_n->gid;
606                 n->uid = c_n->uid;
607                 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
608                 n->wdog_pid = c_n->wdog_pid;
609                 n->mounted_uid = c_n->mounted_uid;
610         } else if (version == 4) {
611                 struct compat_ncp_mount_data_v4 *c_n = raw_data;
612                 struct ncp_mount_data_v4 *n = raw_data;
613 
614                 n->dir_mode = c_n->dir_mode;
615                 n->file_mode = c_n->file_mode;
616                 n->gid = c_n->gid;
617                 n->uid = c_n->uid;
618                 n->retry_count = c_n->retry_count;
619                 n->time_out = c_n->time_out;
620                 n->ncp_fd = c_n->ncp_fd;
621                 n->wdog_pid = c_n->wdog_pid;
622                 n->mounted_uid = c_n->mounted_uid;
623                 n->flags = c_n->flags;
624         } else if (version != 5) {
625                 return NULL;
626         }
627 
628         return raw_data;
629 }
630 
631 
632 struct compat_nfs_string {
633         compat_uint_t len;
634         compat_uptr_t data;
635 };
636 
637 static inline void compat_nfs_string(struct nfs_string *dst,
638                                      struct compat_nfs_string *src)
639 {
640         dst->data = compat_ptr(src->data);
641         dst->len = src->len;
642 }
643 
644 struct compat_nfs4_mount_data_v1 {
645         compat_int_t version;
646         compat_int_t flags;
647         compat_int_t rsize;
648         compat_int_t wsize;
649         compat_int_t timeo;
650         compat_int_t retrans;
651         compat_int_t acregmin;
652         compat_int_t acregmax;
653         compat_int_t acdirmin;
654         compat_int_t acdirmax;
655         struct compat_nfs_string client_addr;
656         struct compat_nfs_string mnt_path;
657         struct compat_nfs_string hostname;
658         compat_uint_t host_addrlen;
659         compat_uptr_t host_addr;
660         compat_int_t proto;
661         compat_int_t auth_flavourlen;
662         compat_uptr_t auth_flavours;
663 };
664 
665 static int do_nfs4_super_data_conv(void *raw_data)
666 {
667         int version = *(compat_uint_t *) raw_data;
668 
669         if (version == 1) {
670                 struct compat_nfs4_mount_data_v1 *raw = raw_data;
671                 struct nfs4_mount_data *real = raw_data;
672 
673                 /* copy the fields backwards */
674                 real->auth_flavours = compat_ptr(raw->auth_flavours);
675                 real->auth_flavourlen = raw->auth_flavourlen;
676                 real->proto = raw->proto;
677                 real->host_addr = compat_ptr(raw->host_addr);
678                 real->host_addrlen = raw->host_addrlen;
679                 compat_nfs_string(&real->hostname, &raw->hostname);
680                 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
681                 compat_nfs_string(&real->client_addr, &raw->client_addr);
682                 real->acdirmax = raw->acdirmax;
683                 real->acdirmin = raw->acdirmin;
684                 real->acregmax = raw->acregmax;
685                 real->acregmin = raw->acregmin;
686                 real->retrans = raw->retrans;
687                 real->timeo = raw->timeo;
688                 real->wsize = raw->wsize;
689                 real->rsize = raw->rsize;
690                 real->flags = raw->flags;
691                 real->version = raw->version;
692         }
693 
694         return 0;
695 }
696 
697 #define NCPFS_NAME      "ncpfs"
698 #define NFS4_NAME       "nfs4"
699 
700 COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
701                        const char __user *, dir_name,
702                        const char __user *, type, compat_ulong_t, flags,
703                        const void __user *, data)
704 {
705         char *kernel_type;
706         void *options;
707         char *kernel_dev;
708         int retval;
709 
710         kernel_type = copy_mount_string(type);
711         retval = PTR_ERR(kernel_type);
712         if (IS_ERR(kernel_type))
713                 goto out;
714 
715         kernel_dev = copy_mount_string(dev_name);
716         retval = PTR_ERR(kernel_dev);
717         if (IS_ERR(kernel_dev))
718                 goto out1;
719 
720         options = copy_mount_options(data);
721         retval = PTR_ERR(options);
722         if (IS_ERR(options))
723                 goto out2;
724 
725         if (kernel_type && options) {
726                 if (!strcmp(kernel_type, NCPFS_NAME)) {
727                         do_ncp_super_data_conv(options);
728                 } else if (!strcmp(kernel_type, NFS4_NAME)) {
729                         retval = -EINVAL;
730                         if (do_nfs4_super_data_conv(options))
731                                 goto out3;
732                 }
733         }
734 
735         retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
736 
737  out3:
738         kfree(options);
739  out2:
740         kfree(kernel_dev);
741  out1:
742         kfree(kernel_type);
743  out:
744         return retval;
745 }
746 
747 struct compat_old_linux_dirent {
748         compat_ulong_t  d_ino;
749         compat_ulong_t  d_offset;
750         unsigned short  d_namlen;
751         char            d_name[1];
752 };
753 
754 struct compat_readdir_callback {
755         struct dir_context ctx;
756         struct compat_old_linux_dirent __user *dirent;
757         int result;
758 };
759 
760 static int compat_fillonedir(struct dir_context *ctx, const char *name,
761                              int namlen, loff_t offset, u64 ino,
762                              unsigned int d_type)
763 {
764         struct compat_readdir_callback *buf =
765                 container_of(ctx, struct compat_readdir_callback, ctx);
766         struct compat_old_linux_dirent __user *dirent;
767         compat_ulong_t d_ino;
768 
769         if (buf->result)
770                 return -EINVAL;
771         d_ino = ino;
772         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
773                 buf->result = -EOVERFLOW;
774                 return -EOVERFLOW;
775         }
776         buf->result++;
777         dirent = buf->dirent;
778         if (!access_ok(VERIFY_WRITE, dirent,
779                         (unsigned long)(dirent->d_name + namlen + 1) -
780                                 (unsigned long)dirent))
781                 goto efault;
782         if (    __put_user(d_ino, &dirent->d_ino) ||
783                 __put_user(offset, &dirent->d_offset) ||
784                 __put_user(namlen, &dirent->d_namlen) ||
785                 __copy_to_user(dirent->d_name, name, namlen) ||
786                 __put_user(0, dirent->d_name + namlen))
787                 goto efault;
788         return 0;
789 efault:
790         buf->result = -EFAULT;
791         return -EFAULT;
792 }
793 
794 COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
795                 struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
796 {
797         int error;
798         struct fd f = fdget_pos(fd);
799         struct compat_readdir_callback buf = {
800                 .ctx.actor = compat_fillonedir,
801                 .dirent = dirent
802         };
803 
804         if (!f.file)
805                 return -EBADF;
806 
807         error = iterate_dir(f.file, &buf.ctx);
808         if (buf.result)
809                 error = buf.result;
810 
811         fdput_pos(f);
812         return error;
813 }
814 
815 struct compat_linux_dirent {
816         compat_ulong_t  d_ino;
817         compat_ulong_t  d_off;
818         unsigned short  d_reclen;
819         char            d_name[1];
820 };
821 
822 struct compat_getdents_callback {
823         struct dir_context ctx;
824         struct compat_linux_dirent __user *current_dir;
825         struct compat_linux_dirent __user *previous;
826         int count;
827         int error;
828 };
829 
830 static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
831                 loff_t offset, u64 ino, unsigned int d_type)
832 {
833         struct compat_linux_dirent __user * dirent;
834         struct compat_getdents_callback *buf =
835                 container_of(ctx, struct compat_getdents_callback, ctx);
836         compat_ulong_t d_ino;
837         int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
838                 namlen + 2, sizeof(compat_long_t));
839 
840         buf->error = -EINVAL;   /* only used if we fail.. */
841         if (reclen > buf->count)
842                 return -EINVAL;
843         d_ino = ino;
844         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
845                 buf->error = -EOVERFLOW;
846                 return -EOVERFLOW;
847         }
848         dirent = buf->previous;
849         if (dirent) {
850                 if (signal_pending(current))
851                         return -EINTR;
852                 if (__put_user(offset, &dirent->d_off))
853                         goto efault;
854         }
855         dirent = buf->current_dir;
856         if (__put_user(d_ino, &dirent->d_ino))
857                 goto efault;
858         if (__put_user(reclen, &dirent->d_reclen))
859                 goto efault;
860         if (copy_to_user(dirent->d_name, name, namlen))
861                 goto efault;
862         if (__put_user(0, dirent->d_name + namlen))
863                 goto efault;
864         if (__put_user(d_type, (char  __user *) dirent + reclen - 1))
865                 goto efault;
866         buf->previous = dirent;
867         dirent = (void __user *)dirent + reclen;
868         buf->current_dir = dirent;
869         buf->count -= reclen;
870         return 0;
871 efault:
872         buf->error = -EFAULT;
873         return -EFAULT;
874 }
875 
876 COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
877                 struct compat_linux_dirent __user *, dirent, unsigned int, count)
878 {
879         struct fd f;
880         struct compat_linux_dirent __user * lastdirent;
881         struct compat_getdents_callback buf = {
882                 .ctx.actor = compat_filldir,
883                 .current_dir = dirent,
884                 .count = count
885         };
886         int error;
887 
888         if (!access_ok(VERIFY_WRITE, dirent, count))
889                 return -EFAULT;
890 
891         f = fdget_pos(fd);
892         if (!f.file)
893                 return -EBADF;
894 
895         error = iterate_dir(f.file, &buf.ctx);
896         if (error >= 0)
897                 error = buf.error;
898         lastdirent = buf.previous;
899         if (lastdirent) {
900                 if (put_user(buf.ctx.pos, &lastdirent->d_off))
901                         error = -EFAULT;
902                 else
903                         error = count - buf.count;
904         }
905         fdput_pos(f);
906         return error;
907 }
908 
909 #ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
910 
911 struct compat_getdents_callback64 {
912         struct dir_context ctx;
913         struct linux_dirent64 __user *current_dir;
914         struct linux_dirent64 __user *previous;
915         int count;
916         int error;
917 };
918 
919 static int compat_filldir64(struct dir_context *ctx, const char *name,
920                             int namlen, loff_t offset, u64 ino,
921                             unsigned int d_type)
922 {
923         struct linux_dirent64 __user *dirent;
924         struct compat_getdents_callback64 *buf =
925                 container_of(ctx, struct compat_getdents_callback64, ctx);
926         int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
927                 sizeof(u64));
928         u64 off;
929 
930         buf->error = -EINVAL;   /* only used if we fail.. */
931         if (reclen > buf->count)
932                 return -EINVAL;
933         dirent = buf->previous;
934 
935         if (dirent) {
936                 if (signal_pending(current))
937                         return -EINTR;
938                 if (__put_user_unaligned(offset, &dirent->d_off))
939                         goto efault;
940         }
941         dirent = buf->current_dir;
942         if (__put_user_unaligned(ino, &dirent->d_ino))
943                 goto efault;
944         off = 0;
945         if (__put_user_unaligned(off, &dirent->d_off))
946                 goto efault;
947         if (__put_user(reclen, &dirent->d_reclen))
948                 goto efault;
949         if (__put_user(d_type, &dirent->d_type))
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         buf->previous = dirent;
956         dirent = (void __user *)dirent + reclen;
957         buf->current_dir = dirent;
958         buf->count -= reclen;
959         return 0;
960 efault:
961         buf->error = -EFAULT;
962         return -EFAULT;
963 }
964 
965 COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
966                 struct linux_dirent64 __user *, dirent, unsigned int, count)
967 {
968         struct fd f;
969         struct linux_dirent64 __user * lastdirent;
970         struct compat_getdents_callback64 buf = {
971                 .ctx.actor = compat_filldir64,
972                 .current_dir = dirent,
973                 .count = count
974         };
975         int error;
976 
977         if (!access_ok(VERIFY_WRITE, dirent, count))
978                 return -EFAULT;
979 
980         f = fdget_pos(fd);
981         if (!f.file)
982                 return -EBADF;
983 
984         error = iterate_dir(f.file, &buf.ctx);
985         if (error >= 0)
986                 error = buf.error;
987         lastdirent = buf.previous;
988         if (lastdirent) {
989                 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
990                 if (__put_user_unaligned(d_off, &lastdirent->d_off))
991                         error = -EFAULT;
992                 else
993                         error = count - buf.count;
994         }
995         fdput_pos(f);
996         return error;
997 }
998 #endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
999 
1000 /*
1001  * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1002  * O_LARGEFILE flag.
1003  */
1004 COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1005 {
1006         return do_sys_open(AT_FDCWD, filename, flags, mode);
1007 }
1008 
1009 /*
1010  * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1011  * O_LARGEFILE flag.
1012  */
1013 COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1014 {
1015         return do_sys_open(dfd, filename, flags, mode);
1016 }
1017 
1018 #define __COMPAT_NFDBITS       (8 * sizeof(compat_ulong_t))
1019 
1020 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1021                                       int timeval, int ret)
1022 {
1023         struct timespec ts;
1024 
1025         if (!p)
1026                 return ret;
1027 
1028         if (current->personality & STICKY_TIMEOUTS)
1029                 goto sticky;
1030 
1031         /* No update for zero timeout */
1032         if (!end_time->tv_sec && !end_time->tv_nsec)
1033                 return ret;
1034 
1035         ktime_get_ts(&ts);
1036         ts = timespec_sub(*end_time, ts);
1037         if (ts.tv_sec < 0)
1038                 ts.tv_sec = ts.tv_nsec = 0;
1039 
1040         if (timeval) {
1041                 struct compat_timeval rtv;
1042 
1043                 rtv.tv_sec = ts.tv_sec;
1044                 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1045 
1046                 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1047                         return ret;
1048         } else {
1049                 struct compat_timespec rts;
1050 
1051                 rts.tv_sec = ts.tv_sec;
1052                 rts.tv_nsec = ts.tv_nsec;
1053 
1054                 if (!copy_to_user(p, &rts, sizeof(rts)))
1055                         return ret;
1056         }
1057         /*
1058          * If an application puts its timeval in read-only memory, we
1059          * don't want the Linux-specific update to the timeval to
1060          * cause a fault after the select has completed
1061          * successfully. However, because we're not updating the
1062          * timeval, we can't restart the system call.
1063          */
1064 
1065 sticky:
1066         if (ret == -ERESTARTNOHAND)
1067                 ret = -EINTR;
1068         return ret;
1069 }
1070 
1071 /*
1072  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
1073  * 64-bit unsigned longs.
1074  */
1075 static
1076 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1077                         unsigned long *fdset)
1078 {
1079         nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1080         if (ufdset) {
1081                 unsigned long odd;
1082 
1083                 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1084                         return -EFAULT;
1085 
1086                 odd = nr & 1UL;
1087                 nr &= ~1UL;
1088                 while (nr) {
1089                         unsigned long h, l;
1090                         if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1091                                 return -EFAULT;
1092                         ufdset += 2;
1093                         *fdset++ = h << 32 | l;
1094                         nr -= 2;
1095                 }
1096                 if (odd && __get_user(*fdset, ufdset))
1097                         return -EFAULT;
1098         } else {
1099                 /* Tricky, must clear full unsigned long in the
1100                  * kernel fdset at the end, this makes sure that
1101                  * actually happens.
1102                  */
1103                 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1104         }
1105         return 0;
1106 }
1107 
1108 static
1109 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1110                       unsigned long *fdset)
1111 {
1112         unsigned long odd;
1113         nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1114 
1115         if (!ufdset)
1116                 return 0;
1117 
1118         odd = nr & 1UL;
1119         nr &= ~1UL;
1120         while (nr) {
1121                 unsigned long h, l;
1122                 l = *fdset++;
1123                 h = l >> 32;
1124                 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1125                         return -EFAULT;
1126                 ufdset += 2;
1127                 nr -= 2;
1128         }
1129         if (odd && __put_user(*fdset, ufdset))
1130                 return -EFAULT;
1131         return 0;
1132 }
1133 
1134 
1135 /*
1136  * This is a virtual copy of sys_select from fs/select.c and probably
1137  * should be compared to it from time to time
1138  */
1139 
1140 /*
1141  * We can actually return ERESTARTSYS instead of EINTR, but I'd
1142  * like to be certain this leads to no problems. So I return
1143  * EINTR just for safety.
1144  *
1145  * Update: ERESTARTSYS breaks at least the xview clock binary, so
1146  * I'm trying ERESTARTNOHAND which restart only when you want to.
1147  */
1148 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1149         compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1150         struct timespec *end_time)
1151 {
1152         fd_set_bits fds;
1153         void *bits;
1154         int size, max_fds, ret = -EINVAL;
1155         struct fdtable *fdt;
1156         long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1157 
1158         if (n < 0)
1159                 goto out_nofds;
1160 
1161         /* max_fds can increase, so grab it once to avoid race */
1162         rcu_read_lock();
1163         fdt = files_fdtable(current->files);
1164         max_fds = fdt->max_fds;
1165         rcu_read_unlock();
1166         if (n > max_fds)
1167                 n = max_fds;
1168 
1169         /*
1170          * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1171          * since we used fdset we need to allocate memory in units of
1172          * long-words.
1173          */
1174         size = FDS_BYTES(n);
1175         bits = stack_fds;
1176         if (size > sizeof(stack_fds) / 6) {
1177                 bits = kmalloc(6 * size, GFP_KERNEL);
1178                 ret = -ENOMEM;
1179                 if (!bits)
1180                         goto out_nofds;
1181         }
1182         fds.in      = (unsigned long *)  bits;
1183         fds.out     = (unsigned long *) (bits +   size);
1184         fds.ex      = (unsigned long *) (bits + 2*size);
1185         fds.res_in  = (unsigned long *) (bits + 3*size);
1186         fds.res_out = (unsigned long *) (bits + 4*size);
1187         fds.res_ex  = (unsigned long *) (bits + 5*size);
1188 
1189         if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1190             (ret = compat_get_fd_set(n, outp, fds.out)) ||
1191             (ret = compat_get_fd_set(n, exp, fds.ex)))
1192                 goto out;
1193         zero_fd_set(n, fds.res_in);
1194         zero_fd_set(n, fds.res_out);
1195         zero_fd_set(n, fds.res_ex);
1196 
1197         ret = do_select(n, &fds, end_time);
1198 
1199         if (ret < 0)
1200                 goto out;
1201         if (!ret) {
1202                 ret = -ERESTARTNOHAND;
1203                 if (signal_pending(current))
1204                         goto out;
1205                 ret = 0;
1206         }
1207 
1208         if (compat_set_fd_set(n, inp, fds.res_in) ||
1209             compat_set_fd_set(n, outp, fds.res_out) ||
1210             compat_set_fd_set(n, exp, fds.res_ex))
1211                 ret = -EFAULT;
1212 out:
1213         if (bits != stack_fds)
1214                 kfree(bits);
1215 out_nofds:
1216         return ret;
1217 }
1218 
1219 COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
1220         compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1221         struct compat_timeval __user *, tvp)
1222 {
1223         struct timespec end_time, *to = NULL;
1224         struct compat_timeval tv;
1225         int ret;
1226 
1227         if (tvp) {
1228                 if (copy_from_user(&tv, tvp, sizeof(tv)))
1229                         return -EFAULT;
1230 
1231                 to = &end_time;
1232                 if (poll_select_set_timeout(to,
1233                                 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1234                                 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1235                         return -EINVAL;
1236         }
1237 
1238         ret = compat_core_sys_select(n, inp, outp, exp, to);
1239         ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1240 
1241         return ret;
1242 }
1243 
1244 struct compat_sel_arg_struct {
1245         compat_ulong_t n;
1246         compat_uptr_t inp;
1247         compat_uptr_t outp;
1248         compat_uptr_t exp;
1249         compat_uptr_t tvp;
1250 };
1251 
1252 COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg)
1253 {
1254         struct compat_sel_arg_struct a;
1255 
1256         if (copy_from_user(&a, arg, sizeof(a)))
1257                 return -EFAULT;
1258         return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1259                                  compat_ptr(a.exp), compat_ptr(a.tvp));
1260 }
1261 
1262 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1263         compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1264         struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1265         compat_size_t sigsetsize)
1266 {
1267         compat_sigset_t ss32;
1268         sigset_t ksigmask, sigsaved;
1269         struct compat_timespec ts;
1270         struct timespec end_time, *to = NULL;
1271         int ret;
1272 
1273         if (tsp) {
1274                 if (copy_from_user(&ts, tsp, sizeof(ts)))
1275                         return -EFAULT;
1276 
1277                 to = &end_time;
1278                 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1279                         return -EINVAL;
1280         }
1281 
1282         if (sigmask) {
1283                 if (sigsetsize != sizeof(compat_sigset_t))
1284                         return -EINVAL;
1285                 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1286                         return -EFAULT;
1287                 sigset_from_compat(&ksigmask, &ss32);
1288 
1289                 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1290                 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1291         }
1292 
1293         ret = compat_core_sys_select(n, inp, outp, exp, to);
1294         ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1295 
1296         if (ret == -ERESTARTNOHAND) {
1297                 /*
1298                  * Don't restore the signal mask yet. Let do_signal() deliver
1299                  * the signal on the way back to userspace, before the signal
1300                  * mask is restored.
1301                  */
1302                 if (sigmask) {
1303                         memcpy(&current->saved_sigmask, &sigsaved,
1304                                         sizeof(sigsaved));
1305                         set_restore_sigmask();
1306                 }
1307         } else if (sigmask)
1308                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1309 
1310         return ret;
1311 }
1312 
1313 COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
1314         compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1315         struct compat_timespec __user *, tsp, void __user *, sig)
1316 {
1317         compat_size_t sigsetsize = 0;
1318         compat_uptr_t up = 0;
1319 
1320         if (sig) {
1321                 if (!access_ok(VERIFY_READ, sig,
1322                                 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1323                         __get_user(up, (compat_uptr_t __user *)sig) ||
1324                         __get_user(sigsetsize,
1325                                 (compat_size_t __user *)(sig+sizeof(up))))
1326                         return -EFAULT;
1327         }
1328         return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1329                                  sigsetsize);
1330 }
1331 
1332 COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
1333         unsigned int,  nfds, struct compat_timespec __user *, tsp,
1334         const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
1335 {
1336         compat_sigset_t ss32;
1337         sigset_t ksigmask, sigsaved;
1338         struct compat_timespec ts;
1339         struct timespec end_time, *to = NULL;
1340         int ret;
1341 
1342         if (tsp) {
1343                 if (copy_from_user(&ts, tsp, sizeof(ts)))
1344                         return -EFAULT;
1345 
1346                 to = &end_time;
1347                 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
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 
1362         ret = do_sys_poll(ufds, nfds, to);
1363 
1364         /* We can restart this syscall, usually */
1365         if (ret == -EINTR) {
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));
1374                         set_restore_sigmask();
1375                 }
1376                 ret = -ERESTARTNOHAND;
1377         } else if (sigmask)
1378                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1379 
1380         ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1381 
1382         return ret;
1383 }
1384 
1385 #ifdef CONFIG_FHANDLE
1386 /*
1387  * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1388  * doesn't set the O_LARGEFILE flag.
1389  */
1390 COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1391                              struct file_handle __user *, handle, int, flags)
1392 {
1393         return do_handle_open(mountdirfd, handle, flags);
1394 }
1395 #endif
1396 

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