Root/fs/compat.c

1/*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18#include <linux/stddef.h>
19#include <linux/kernel.h>
20#include <linux/linkage.h>
21#include <linux/compat.h>
22#include <linux/errno.h>
23#include <linux/time.h>
24#include <linux/fs.h>
25#include <linux/fcntl.h>
26#include <linux/namei.h>
27#include <linux/file.h>
28#include <linux/fdtable.h>
29#include <linux/vfs.h>
30#include <linux/ioctl.h>
31#include <linux/init.h>
32#include <linux/ncp_mount.h>
33#include <linux/nfs4_mount.h>
34#include <linux/syscalls.h>
35#include <linux/ctype.h>
36#include <linux/module.h>
37#include <linux/dirent.h>
38#include <linux/fsnotify.h>
39#include <linux/highuid.h>
40#include <linux/nfsd/syscall.h>
41#include <linux/personality.h>
42#include <linux/rwsem.h>
43#include <linux/tsacct_kern.h>
44#include <linux/security.h>
45#include <linux/highmem.h>
46#include <linux/signal.h>
47#include <linux/poll.h>
48#include <linux/mm.h>
49#include <linux/eventpoll.h>
50#include <linux/fs_struct.h>
51#include <linux/slab.h>
52#include <linux/pagemap.h>
53
54#include <asm/uaccess.h>
55#include <asm/mmu_context.h>
56#include <asm/ioctls.h>
57#include "internal.h"
58
59int compat_log = 1;
60
61int compat_printk(const char *fmt, ...)
62{
63    va_list ap;
64    int ret;
65    if (!compat_log)
66        return 0;
67    va_start(ap, fmt);
68    ret = vprintk(fmt, ap);
69    va_end(ap);
70    return ret;
71}
72
73#include "read_write.h"
74
75/*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
79asmlinkage long compat_sys_utime(const char __user *filename,
80                 struct compat_utimbuf __user *t)
81{
82    struct timespec tv[2];
83
84    if (t) {
85        if (get_user(tv[0].tv_sec, &t->actime) ||
86            get_user(tv[1].tv_sec, &t->modtime))
87            return -EFAULT;
88        tv[0].tv_nsec = 0;
89        tv[1].tv_nsec = 0;
90    }
91    return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92}
93
94asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
95{
96    struct timespec tv[2];
97
98    if (t) {
99        if (get_compat_timespec(&tv[0], &t[0]) ||
100            get_compat_timespec(&tv[1], &t[1]))
101            return -EFAULT;
102
103        if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
104            return 0;
105    }
106    return do_utimes(dfd, filename, t ? tv : NULL, flags);
107}
108
109asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
110{
111    struct timespec tv[2];
112
113    if (t) {
114        if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
115            get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
116            get_user(tv[1].tv_sec, &t[1].tv_sec) ||
117            get_user(tv[1].tv_nsec, &t[1].tv_usec))
118            return -EFAULT;
119        if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
120            tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
121            return -EINVAL;
122        tv[0].tv_nsec *= 1000;
123        tv[1].tv_nsec *= 1000;
124    }
125    return do_utimes(dfd, filename, t ? tv : NULL, 0);
126}
127
128asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
129{
130    return compat_sys_futimesat(AT_FDCWD, filename, t);
131}
132
133static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
134{
135    compat_ino_t ino = stat->ino;
136    typeof(ubuf->st_uid) uid = 0;
137    typeof(ubuf->st_gid) gid = 0;
138    int err;
139
140    SET_UID(uid, stat->uid);
141    SET_GID(gid, stat->gid);
142
143    if ((u64) stat->size > MAX_NON_LFS ||
144        !old_valid_dev(stat->dev) ||
145        !old_valid_dev(stat->rdev))
146        return -EOVERFLOW;
147    if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
148        return -EOVERFLOW;
149
150    if (clear_user(ubuf, sizeof(*ubuf)))
151        return -EFAULT;
152
153    err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
154    err |= __put_user(ino, &ubuf->st_ino);
155    err |= __put_user(stat->mode, &ubuf->st_mode);
156    err |= __put_user(stat->nlink, &ubuf->st_nlink);
157    err |= __put_user(uid, &ubuf->st_uid);
158    err |= __put_user(gid, &ubuf->st_gid);
159    err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
160    err |= __put_user(stat->size, &ubuf->st_size);
161    err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
162    err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
163    err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
164    err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
165    err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
166    err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
167    err |= __put_user(stat->blksize, &ubuf->st_blksize);
168    err |= __put_user(stat->blocks, &ubuf->st_blocks);
169    return err;
170}
171
172asmlinkage long compat_sys_newstat(const char __user * filename,
173        struct compat_stat __user *statbuf)
174{
175    struct kstat stat;
176    int error;
177
178    error = vfs_stat(filename, &stat);
179    if (error)
180        return error;
181    return cp_compat_stat(&stat, statbuf);
182}
183
184asmlinkage long compat_sys_newlstat(const char __user * filename,
185        struct compat_stat __user *statbuf)
186{
187    struct kstat stat;
188    int error;
189
190    error = vfs_lstat(filename, &stat);
191    if (error)
192        return error;
193    return cp_compat_stat(&stat, statbuf);
194}
195
196#ifndef __ARCH_WANT_STAT64
197asmlinkage long compat_sys_newfstatat(unsigned int dfd,
198        const char __user *filename,
199        struct compat_stat __user *statbuf, int flag)
200{
201    struct kstat stat;
202    int error;
203
204    error = vfs_fstatat(dfd, filename, &stat, flag);
205    if (error)
206        return error;
207    return cp_compat_stat(&stat, statbuf);
208}
209#endif
210
211asmlinkage long compat_sys_newfstat(unsigned int fd,
212        struct compat_stat __user * statbuf)
213{
214    struct kstat stat;
215    int error = vfs_fstat(fd, &stat);
216
217    if (!error)
218        error = cp_compat_stat(&stat, statbuf);
219    return error;
220}
221
222static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
223{
224    
225    if (sizeof ubuf->f_blocks == 4) {
226        if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
227             kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
228            return -EOVERFLOW;
229        /* f_files and f_ffree may be -1; it's okay
230         * to stuff that into 32 bits */
231        if (kbuf->f_files != 0xffffffffffffffffULL
232         && (kbuf->f_files & 0xffffffff00000000ULL))
233            return -EOVERFLOW;
234        if (kbuf->f_ffree != 0xffffffffffffffffULL
235         && (kbuf->f_ffree & 0xffffffff00000000ULL))
236            return -EOVERFLOW;
237    }
238    if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
239        __put_user(kbuf->f_type, &ubuf->f_type) ||
240        __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
241        __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
242        __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
243        __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
244        __put_user(kbuf->f_files, &ubuf->f_files) ||
245        __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
246        __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
247        __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
248        __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
249        __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
250        __put_user(0, &ubuf->f_spare[0]) ||
251        __put_user(0, &ubuf->f_spare[1]) ||
252        __put_user(0, &ubuf->f_spare[2]) ||
253        __put_user(0, &ubuf->f_spare[3]) ||
254        __put_user(0, &ubuf->f_spare[4]))
255        return -EFAULT;
256    return 0;
257}
258
259/*
260 * The following statfs calls are copies of code from fs/statfs.c and
261 * should be checked against those from time to time
262 */
263asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
264{
265    struct kstatfs tmp;
266    int error = user_statfs(pathname, &tmp);
267    if (!error)
268        error = put_compat_statfs(buf, &tmp);
269    return error;
270}
271
272asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
273{
274    struct kstatfs tmp;
275    int error = fd_statfs(fd, &tmp);
276    if (!error)
277        error = put_compat_statfs(buf, &tmp);
278    return error;
279}
280
281static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
282{
283    if (sizeof ubuf->f_blocks == 4) {
284        if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
285             kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
286            return -EOVERFLOW;
287        /* f_files and f_ffree may be -1; it's okay
288         * to stuff that into 32 bits */
289        if (kbuf->f_files != 0xffffffffffffffffULL
290         && (kbuf->f_files & 0xffffffff00000000ULL))
291            return -EOVERFLOW;
292        if (kbuf->f_ffree != 0xffffffffffffffffULL
293         && (kbuf->f_ffree & 0xffffffff00000000ULL))
294            return -EOVERFLOW;
295    }
296    if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
297        __put_user(kbuf->f_type, &ubuf->f_type) ||
298        __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
299        __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
300        __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
301        __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
302        __put_user(kbuf->f_files, &ubuf->f_files) ||
303        __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
304        __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
305        __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
306        __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
307        __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
308        __put_user(kbuf->f_flags, &ubuf->f_flags) ||
309        __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
310        return -EFAULT;
311    return 0;
312}
313
314asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
315{
316    struct kstatfs tmp;
317    int error;
318
319    if (sz != sizeof(*buf))
320        return -EINVAL;
321
322    error = user_statfs(pathname, &tmp);
323    if (!error)
324        error = put_compat_statfs64(buf, &tmp);
325    return error;
326}
327
328asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
329{
330    struct kstatfs tmp;
331    int error;
332
333    if (sz != sizeof(*buf))
334        return -EINVAL;
335
336    error = fd_statfs(fd, &tmp);
337    if (!error)
338        error = put_compat_statfs64(buf, &tmp);
339    return error;
340}
341
342/*
343 * This is a copy of sys_ustat, just dealing with a structure layout.
344 * Given how simple this syscall is that apporach is more maintainable
345 * than the various conversion hacks.
346 */
347asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
348{
349    struct super_block *sb;
350    struct compat_ustat tmp;
351    struct kstatfs sbuf;
352    int err;
353
354    sb = user_get_super(new_decode_dev(dev));
355    if (!sb)
356        return -EINVAL;
357    err = statfs_by_dentry(sb->s_root, &sbuf);
358    drop_super(sb);
359    if (err)
360        return err;
361
362    memset(&tmp, 0, sizeof(struct compat_ustat));
363    tmp.f_tfree = sbuf.f_bfree;
364    tmp.f_tinode = sbuf.f_ffree;
365    if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
366        return -EFAULT;
367    return 0;
368}
369
370static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
371{
372    if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
373        __get_user(kfl->l_type, &ufl->l_type) ||
374        __get_user(kfl->l_whence, &ufl->l_whence) ||
375        __get_user(kfl->l_start, &ufl->l_start) ||
376        __get_user(kfl->l_len, &ufl->l_len) ||
377        __get_user(kfl->l_pid, &ufl->l_pid))
378        return -EFAULT;
379    return 0;
380}
381
382static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
383{
384    if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
385        __put_user(kfl->l_type, &ufl->l_type) ||
386        __put_user(kfl->l_whence, &ufl->l_whence) ||
387        __put_user(kfl->l_start, &ufl->l_start) ||
388        __put_user(kfl->l_len, &ufl->l_len) ||
389        __put_user(kfl->l_pid, &ufl->l_pid))
390        return -EFAULT;
391    return 0;
392}
393
394#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
395static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
396{
397    if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
398        __get_user(kfl->l_type, &ufl->l_type) ||
399        __get_user(kfl->l_whence, &ufl->l_whence) ||
400        __get_user(kfl->l_start, &ufl->l_start) ||
401        __get_user(kfl->l_len, &ufl->l_len) ||
402        __get_user(kfl->l_pid, &ufl->l_pid))
403        return -EFAULT;
404    return 0;
405}
406#endif
407
408#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
409static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
410{
411    if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
412        __put_user(kfl->l_type, &ufl->l_type) ||
413        __put_user(kfl->l_whence, &ufl->l_whence) ||
414        __put_user(kfl->l_start, &ufl->l_start) ||
415        __put_user(kfl->l_len, &ufl->l_len) ||
416        __put_user(kfl->l_pid, &ufl->l_pid))
417        return -EFAULT;
418    return 0;
419}
420#endif
421
422asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
423        unsigned long arg)
424{
425    mm_segment_t old_fs;
426    struct flock f;
427    long ret;
428
429    switch (cmd) {
430    case F_GETLK:
431    case F_SETLK:
432    case F_SETLKW:
433        ret = get_compat_flock(&f, compat_ptr(arg));
434        if (ret != 0)
435            break;
436        old_fs = get_fs();
437        set_fs(KERNEL_DS);
438        ret = sys_fcntl(fd, cmd, (unsigned long)&f);
439        set_fs(old_fs);
440        if (cmd == F_GETLK && ret == 0) {
441            /* GETLK was successful and we need to return the data...
442             * but it needs to fit in the compat structure.
443             * l_start shouldn't be too big, unless the original
444             * start + end is greater than COMPAT_OFF_T_MAX, in which
445             * case the app was asking for trouble, so we return
446             * -EOVERFLOW in that case.
447             * l_len could be too big, in which case we just truncate it,
448             * and only allow the app to see that part of the conflicting
449             * lock that might make sense to it anyway
450             */
451
452            if (f.l_start > COMPAT_OFF_T_MAX)
453                ret = -EOVERFLOW;
454            if (f.l_len > COMPAT_OFF_T_MAX)
455                f.l_len = COMPAT_OFF_T_MAX;
456            if (ret == 0)
457                ret = put_compat_flock(&f, compat_ptr(arg));
458        }
459        break;
460
461    case F_GETLK64:
462    case F_SETLK64:
463    case F_SETLKW64:
464        ret = get_compat_flock64(&f, compat_ptr(arg));
465        if (ret != 0)
466            break;
467        old_fs = get_fs();
468        set_fs(KERNEL_DS);
469        ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
470                ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
471                (unsigned long)&f);
472        set_fs(old_fs);
473        if (cmd == F_GETLK64 && ret == 0) {
474            /* need to return lock information - see above for commentary */
475            if (f.l_start > COMPAT_LOFF_T_MAX)
476                ret = -EOVERFLOW;
477            if (f.l_len > COMPAT_LOFF_T_MAX)
478                f.l_len = COMPAT_LOFF_T_MAX;
479            if (ret == 0)
480                ret = put_compat_flock64(&f, compat_ptr(arg));
481        }
482        break;
483
484    default:
485        ret = sys_fcntl(fd, cmd, arg);
486        break;
487    }
488    return ret;
489}
490
491asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
492        unsigned long arg)
493{
494    if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
495        return -EINVAL;
496    return compat_sys_fcntl64(fd, cmd, arg);
497}
498
499asmlinkage long
500compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
501{
502    long ret;
503    aio_context_t ctx64;
504
505    mm_segment_t oldfs = get_fs();
506    if (unlikely(get_user(ctx64, ctx32p)))
507        return -EFAULT;
508
509    set_fs(KERNEL_DS);
510    /* The __user pointer cast is valid because of the set_fs() */
511    ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
512    set_fs(oldfs);
513    /* truncating is ok because it's a user address */
514    if (!ret)
515        ret = put_user((u32) ctx64, ctx32p);
516    return ret;
517}
518
519asmlinkage long
520compat_sys_io_getevents(aio_context_t ctx_id,
521                 unsigned long min_nr,
522                 unsigned long nr,
523                 struct io_event __user *events,
524                 struct compat_timespec __user *timeout)
525{
526    long ret;
527    struct timespec t;
528    struct timespec __user *ut = NULL;
529
530    ret = -EFAULT;
531    if (unlikely(!access_ok(VERIFY_WRITE, events,
532                nr * sizeof(struct io_event))))
533        goto out;
534    if (timeout) {
535        if (get_compat_timespec(&t, timeout))
536            goto out;
537
538        ut = compat_alloc_user_space(sizeof(*ut));
539        if (copy_to_user(ut, &t, sizeof(t)) )
540            goto out;
541    }
542    ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
543out:
544    return ret;
545}
546
547/* A write operation does a read from user space and vice versa */
548#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
549
550ssize_t compat_rw_copy_check_uvector(int type,
551        const struct compat_iovec __user *uvector, unsigned long nr_segs,
552        unsigned long fast_segs, struct iovec *fast_pointer,
553        struct iovec **ret_pointer)
554{
555    compat_ssize_t tot_len;
556    struct iovec *iov = *ret_pointer = fast_pointer;
557    ssize_t ret = 0;
558    int seg;
559
560    /*
561     * SuS says "The readv() function *may* fail if the iovcnt argument
562     * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
563     * traditionally returned zero for zero segments, so...
564     */
565    if (nr_segs == 0)
566        goto out;
567
568    ret = -EINVAL;
569    if (nr_segs > UIO_MAXIOV || nr_segs < 0)
570        goto out;
571    if (nr_segs > fast_segs) {
572        ret = -ENOMEM;
573        iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
574        if (iov == NULL)
575            goto out;
576    }
577    *ret_pointer = iov;
578
579    /*
580     * Single unix specification:
581     * We should -EINVAL if an element length is not >= 0 and fitting an
582     * ssize_t.
583     *
584     * In Linux, the total length is limited to MAX_RW_COUNT, there is
585     * no overflow possibility.
586     */
587    tot_len = 0;
588    ret = -EINVAL;
589    for (seg = 0; seg < nr_segs; seg++) {
590        compat_uptr_t buf;
591        compat_ssize_t len;
592
593        if (__get_user(len, &uvector->iov_len) ||
594           __get_user(buf, &uvector->iov_base)) {
595            ret = -EFAULT;
596            goto out;
597        }
598        if (len < 0) /* size_t not fitting in compat_ssize_t .. */
599            goto out;
600        if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
601            ret = -EFAULT;
602            goto out;
603        }
604        if (len > MAX_RW_COUNT - tot_len)
605            len = MAX_RW_COUNT - tot_len;
606        tot_len += len;
607        iov->iov_base = compat_ptr(buf);
608        iov->iov_len = (compat_size_t) len;
609        uvector++;
610        iov++;
611    }
612    ret = tot_len;
613
614out:
615    return ret;
616}
617
618static inline long
619copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
620{
621    compat_uptr_t uptr;
622    int i;
623
624    for (i = 0; i < nr; ++i) {
625        if (get_user(uptr, ptr32 + i))
626            return -EFAULT;
627        if (put_user(compat_ptr(uptr), ptr64 + i))
628            return -EFAULT;
629    }
630    return 0;
631}
632
633#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
634
635asmlinkage long
636compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
637{
638    struct iocb __user * __user *iocb64;
639    long ret;
640
641    if (unlikely(nr < 0))
642        return -EINVAL;
643
644    if (nr > MAX_AIO_SUBMITS)
645        nr = MAX_AIO_SUBMITS;
646    
647    iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
648    ret = copy_iocb(nr, iocb, iocb64);
649    if (!ret)
650        ret = do_io_submit(ctx_id, nr, iocb64, 1);
651    return ret;
652}
653
654struct compat_ncp_mount_data {
655    compat_int_t version;
656    compat_uint_t ncp_fd;
657    __compat_uid_t mounted_uid;
658    compat_pid_t wdog_pid;
659    unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
660    compat_uint_t time_out;
661    compat_uint_t retry_count;
662    compat_uint_t flags;
663    __compat_uid_t uid;
664    __compat_gid_t gid;
665    compat_mode_t file_mode;
666    compat_mode_t dir_mode;
667};
668
669struct compat_ncp_mount_data_v4 {
670    compat_int_t version;
671    compat_ulong_t flags;
672    compat_ulong_t mounted_uid;
673    compat_long_t wdog_pid;
674    compat_uint_t ncp_fd;
675    compat_uint_t time_out;
676    compat_uint_t retry_count;
677    compat_ulong_t uid;
678    compat_ulong_t gid;
679    compat_ulong_t file_mode;
680    compat_ulong_t dir_mode;
681};
682
683static void *do_ncp_super_data_conv(void *raw_data)
684{
685    int version = *(unsigned int *)raw_data;
686
687    if (version == 3) {
688        struct compat_ncp_mount_data *c_n = raw_data;
689        struct ncp_mount_data *n = raw_data;
690
691        n->dir_mode = c_n->dir_mode;
692        n->file_mode = c_n->file_mode;
693        n->gid = c_n->gid;
694        n->uid = c_n->uid;
695        memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
696        n->wdog_pid = c_n->wdog_pid;
697        n->mounted_uid = c_n->mounted_uid;
698    } else if (version == 4) {
699        struct compat_ncp_mount_data_v4 *c_n = raw_data;
700        struct ncp_mount_data_v4 *n = raw_data;
701
702        n->dir_mode = c_n->dir_mode;
703        n->file_mode = c_n->file_mode;
704        n->gid = c_n->gid;
705        n->uid = c_n->uid;
706        n->retry_count = c_n->retry_count;
707        n->time_out = c_n->time_out;
708        n->ncp_fd = c_n->ncp_fd;
709        n->wdog_pid = c_n->wdog_pid;
710        n->mounted_uid = c_n->mounted_uid;
711        n->flags = c_n->flags;
712    } else if (version != 5) {
713        return NULL;
714    }
715
716    return raw_data;
717}
718
719
720struct compat_nfs_string {
721    compat_uint_t len;
722    compat_uptr_t data;
723};
724
725static inline void compat_nfs_string(struct nfs_string *dst,
726                     struct compat_nfs_string *src)
727{
728    dst->data = compat_ptr(src->data);
729    dst->len = src->len;
730}
731
732struct compat_nfs4_mount_data_v1 {
733    compat_int_t version;
734    compat_int_t flags;
735    compat_int_t rsize;
736    compat_int_t wsize;
737    compat_int_t timeo;
738    compat_int_t retrans;
739    compat_int_t acregmin;
740    compat_int_t acregmax;
741    compat_int_t acdirmin;
742    compat_int_t acdirmax;
743    struct compat_nfs_string client_addr;
744    struct compat_nfs_string mnt_path;
745    struct compat_nfs_string hostname;
746    compat_uint_t host_addrlen;
747    compat_uptr_t host_addr;
748    compat_int_t proto;
749    compat_int_t auth_flavourlen;
750    compat_uptr_t auth_flavours;
751};
752
753static int do_nfs4_super_data_conv(void *raw_data)
754{
755    int version = *(compat_uint_t *) raw_data;
756
757    if (version == 1) {
758        struct compat_nfs4_mount_data_v1 *raw = raw_data;
759        struct nfs4_mount_data *real = raw_data;
760
761        /* copy the fields backwards */
762        real->auth_flavours = compat_ptr(raw->auth_flavours);
763        real->auth_flavourlen = raw->auth_flavourlen;
764        real->proto = raw->proto;
765        real->host_addr = compat_ptr(raw->host_addr);
766        real->host_addrlen = raw->host_addrlen;
767        compat_nfs_string(&real->hostname, &raw->hostname);
768        compat_nfs_string(&real->mnt_path, &raw->mnt_path);
769        compat_nfs_string(&real->client_addr, &raw->client_addr);
770        real->acdirmax = raw->acdirmax;
771        real->acdirmin = raw->acdirmin;
772        real->acregmax = raw->acregmax;
773        real->acregmin = raw->acregmin;
774        real->retrans = raw->retrans;
775        real->timeo = raw->timeo;
776        real->wsize = raw->wsize;
777        real->rsize = raw->rsize;
778        real->flags = raw->flags;
779        real->version = raw->version;
780    }
781
782    return 0;
783}
784
785#define NCPFS_NAME "ncpfs"
786#define NFS4_NAME "nfs4"
787
788asmlinkage long compat_sys_mount(const char __user * dev_name,
789                 const char __user * dir_name,
790                 const char __user * type, unsigned long flags,
791                 const void __user * data)
792{
793    char *kernel_type;
794    unsigned long data_page;
795    char *kernel_dev;
796    char *dir_page;
797    int retval;
798
799    retval = copy_mount_string(type, &kernel_type);
800    if (retval < 0)
801        goto out;
802
803    dir_page = getname(dir_name);
804    retval = PTR_ERR(dir_page);
805    if (IS_ERR(dir_page))
806        goto out1;
807
808    retval = copy_mount_string(dev_name, &kernel_dev);
809    if (retval < 0)
810        goto out2;
811
812    retval = copy_mount_options(data, &data_page);
813    if (retval < 0)
814        goto out3;
815
816    retval = -EINVAL;
817
818    if (kernel_type && data_page) {
819        if (!strcmp(kernel_type, NCPFS_NAME)) {
820            do_ncp_super_data_conv((void *)data_page);
821        } else if (!strcmp(kernel_type, NFS4_NAME)) {
822            if (do_nfs4_super_data_conv((void *) data_page))
823                goto out4;
824        }
825    }
826
827    retval = do_mount(kernel_dev, dir_page, kernel_type,
828            flags, (void*)data_page);
829
830 out4:
831    free_page(data_page);
832 out3:
833    kfree(kernel_dev);
834 out2:
835    putname(dir_page);
836 out1:
837    kfree(kernel_type);
838 out:
839    return retval;
840}
841
842struct compat_old_linux_dirent {
843    compat_ulong_t d_ino;
844    compat_ulong_t d_offset;
845    unsigned short d_namlen;
846    char d_name[1];
847};
848
849struct compat_readdir_callback {
850    struct compat_old_linux_dirent __user *dirent;
851    int result;
852};
853
854static int compat_fillonedir(void *__buf, const char *name, int namlen,
855            loff_t offset, u64 ino, unsigned int d_type)
856{
857    struct compat_readdir_callback *buf = __buf;
858    struct compat_old_linux_dirent __user *dirent;
859    compat_ulong_t d_ino;
860
861    if (buf->result)
862        return -EINVAL;
863    d_ino = ino;
864    if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
865        buf->result = -EOVERFLOW;
866        return -EOVERFLOW;
867    }
868    buf->result++;
869    dirent = buf->dirent;
870    if (!access_ok(VERIFY_WRITE, dirent,
871            (unsigned long)(dirent->d_name + namlen + 1) -
872                (unsigned long)dirent))
873        goto efault;
874    if ( __put_user(d_ino, &dirent->d_ino) ||
875        __put_user(offset, &dirent->d_offset) ||
876        __put_user(namlen, &dirent->d_namlen) ||
877        __copy_to_user(dirent->d_name, name, namlen) ||
878        __put_user(0, dirent->d_name + namlen))
879        goto efault;
880    return 0;
881efault:
882    buf->result = -EFAULT;
883    return -EFAULT;
884}
885
886asmlinkage long compat_sys_old_readdir(unsigned int fd,
887    struct compat_old_linux_dirent __user *dirent, unsigned int count)
888{
889    int error;
890    struct file *file;
891    struct compat_readdir_callback buf;
892
893    error = -EBADF;
894    file = fget(fd);
895    if (!file)
896        goto out;
897
898    buf.result = 0;
899    buf.dirent = dirent;
900
901    error = vfs_readdir(file, compat_fillonedir, &buf);
902    if (buf.result)
903        error = buf.result;
904
905    fput(file);
906out:
907    return error;
908}
909
910struct compat_linux_dirent {
911    compat_ulong_t d_ino;
912    compat_ulong_t d_off;
913    unsigned short d_reclen;
914    char d_name[1];
915};
916
917struct compat_getdents_callback {
918    struct compat_linux_dirent __user *current_dir;
919    struct compat_linux_dirent __user *previous;
920    int count;
921    int error;
922};
923
924static int compat_filldir(void *__buf, const char *name, int namlen,
925        loff_t offset, u64 ino, unsigned int d_type)
926{
927    struct compat_linux_dirent __user * dirent;
928    struct compat_getdents_callback *buf = __buf;
929    compat_ulong_t d_ino;
930    int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
931        namlen + 2, sizeof(compat_long_t));
932
933    buf->error = -EINVAL; /* only used if we fail.. */
934    if (reclen > buf->count)
935        return -EINVAL;
936    d_ino = ino;
937    if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
938        buf->error = -EOVERFLOW;
939        return -EOVERFLOW;
940    }
941    dirent = buf->previous;
942    if (dirent) {
943        if (__put_user(offset, &dirent->d_off))
944            goto efault;
945    }
946    dirent = buf->current_dir;
947    if (__put_user(d_ino, &dirent->d_ino))
948        goto efault;
949    if (__put_user(reclen, &dirent->d_reclen))
950        goto efault;
951    if (copy_to_user(dirent->d_name, name, namlen))
952        goto efault;
953    if (__put_user(0, dirent->d_name + namlen))
954        goto efault;
955    if (__put_user(d_type, (char __user *) dirent + reclen - 1))
956        goto efault;
957    buf->previous = dirent;
958    dirent = (void __user *)dirent + reclen;
959    buf->current_dir = dirent;
960    buf->count -= reclen;
961    return 0;
962efault:
963    buf->error = -EFAULT;
964    return -EFAULT;
965}
966
967asmlinkage long compat_sys_getdents(unsigned int fd,
968        struct compat_linux_dirent __user *dirent, unsigned int count)
969{
970    struct file * file;
971    struct compat_linux_dirent __user * lastdirent;
972    struct compat_getdents_callback buf;
973    int error;
974
975    error = -EFAULT;
976    if (!access_ok(VERIFY_WRITE, dirent, count))
977        goto out;
978
979    error = -EBADF;
980    file = fget(fd);
981    if (!file)
982        goto out;
983
984    buf.current_dir = dirent;
985    buf.previous = NULL;
986    buf.count = count;
987    buf.error = 0;
988
989    error = vfs_readdir(file, compat_filldir, &buf);
990    if (error >= 0)
991        error = buf.error;
992    lastdirent = buf.previous;
993    if (lastdirent) {
994        if (put_user(file->f_pos, &lastdirent->d_off))
995            error = -EFAULT;
996        else
997            error = count - buf.count;
998    }
999    fput(file);
1000out:
1001    return error;
1002}
1003
1004#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1005
1006struct compat_getdents_callback64 {
1007    struct linux_dirent64 __user *current_dir;
1008    struct linux_dirent64 __user *previous;
1009    int count;
1010    int error;
1011};
1012
1013static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1014             u64 ino, unsigned int d_type)
1015{
1016    struct linux_dirent64 __user *dirent;
1017    struct compat_getdents_callback64 *buf = __buf;
1018    int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1019        sizeof(u64));
1020    u64 off;
1021
1022    buf->error = -EINVAL; /* only used if we fail.. */
1023    if (reclen > buf->count)
1024        return -EINVAL;
1025    dirent = buf->previous;
1026
1027    if (dirent) {
1028        if (__put_user_unaligned(offset, &dirent->d_off))
1029            goto efault;
1030    }
1031    dirent = buf->current_dir;
1032    if (__put_user_unaligned(ino, &dirent->d_ino))
1033        goto efault;
1034    off = 0;
1035    if (__put_user_unaligned(off, &dirent->d_off))
1036        goto efault;
1037    if (__put_user(reclen, &dirent->d_reclen))
1038        goto efault;
1039    if (__put_user(d_type, &dirent->d_type))
1040        goto efault;
1041    if (copy_to_user(dirent->d_name, name, namlen))
1042        goto efault;
1043    if (__put_user(0, dirent->d_name + namlen))
1044        goto efault;
1045    buf->previous = dirent;
1046    dirent = (void __user *)dirent + reclen;
1047    buf->current_dir = dirent;
1048    buf->count -= reclen;
1049    return 0;
1050efault:
1051    buf->error = -EFAULT;
1052    return -EFAULT;
1053}
1054
1055asmlinkage long compat_sys_getdents64(unsigned int fd,
1056        struct linux_dirent64 __user * dirent, unsigned int count)
1057{
1058    struct file * file;
1059    struct linux_dirent64 __user * lastdirent;
1060    struct compat_getdents_callback64 buf;
1061    int error;
1062
1063    error = -EFAULT;
1064    if (!access_ok(VERIFY_WRITE, dirent, count))
1065        goto out;
1066
1067    error = -EBADF;
1068    file = fget(fd);
1069    if (!file)
1070        goto out;
1071
1072    buf.current_dir = dirent;
1073    buf.previous = NULL;
1074    buf.count = count;
1075    buf.error = 0;
1076
1077    error = vfs_readdir(file, compat_filldir64, &buf);
1078    if (error >= 0)
1079        error = buf.error;
1080    lastdirent = buf.previous;
1081    if (lastdirent) {
1082        typeof(lastdirent->d_off) d_off = file->f_pos;
1083        if (__put_user_unaligned(d_off, &lastdirent->d_off))
1084            error = -EFAULT;
1085        else
1086            error = count - buf.count;
1087    }
1088    fput(file);
1089out:
1090    return error;
1091}
1092#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1093
1094static ssize_t compat_do_readv_writev(int type, struct file *file,
1095                   const struct compat_iovec __user *uvector,
1096                   unsigned long nr_segs, loff_t *pos)
1097{
1098    compat_ssize_t tot_len;
1099    struct iovec iovstack[UIO_FASTIOV];
1100    struct iovec *iov = iovstack;
1101    ssize_t ret;
1102    io_fn_t fn;
1103    iov_fn_t fnv;
1104
1105    ret = -EINVAL;
1106    if (!file->f_op)
1107        goto out;
1108
1109    ret = -EFAULT;
1110    if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1111        goto out;
1112
1113    tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1114                           UIO_FASTIOV, iovstack, &iov);
1115    if (tot_len == 0) {
1116        ret = 0;
1117        goto out;
1118    }
1119
1120    ret = rw_verify_area(type, file, pos, tot_len);
1121    if (ret < 0)
1122        goto out;
1123
1124    fnv = NULL;
1125    if (type == READ) {
1126        fn = file->f_op->read;
1127        fnv = file->f_op->aio_read;
1128    } else {
1129        fn = (io_fn_t)file->f_op->write;
1130        fnv = file->f_op->aio_write;
1131    }
1132
1133    if (fnv)
1134        ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1135                        pos, fnv);
1136    else
1137        ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1138
1139out:
1140    if (iov != iovstack)
1141        kfree(iov);
1142    if ((ret + (type == READ)) > 0) {
1143        if (type == READ)
1144            fsnotify_access(file);
1145        else
1146            fsnotify_modify(file);
1147    }
1148    return ret;
1149}
1150
1151static size_t compat_readv(struct file *file,
1152               const struct compat_iovec __user *vec,
1153               unsigned long vlen, loff_t *pos)
1154{
1155    ssize_t ret = -EBADF;
1156
1157    if (!(file->f_mode & FMODE_READ))
1158        goto out;
1159
1160    ret = -EINVAL;
1161    if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1162        goto out;
1163
1164    ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1165
1166out:
1167    if (ret > 0)
1168        add_rchar(current, ret);
1169    inc_syscr(current);
1170    return ret;
1171}
1172
1173asmlinkage ssize_t
1174compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1175         unsigned long vlen)
1176{
1177    struct file *file;
1178    int fput_needed;
1179    ssize_t ret;
1180
1181    file = fget_light(fd, &fput_needed);
1182    if (!file)
1183        return -EBADF;
1184    ret = compat_readv(file, vec, vlen, &file->f_pos);
1185    fput_light(file, fput_needed);
1186    return ret;
1187}
1188
1189asmlinkage ssize_t
1190compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1191          unsigned long vlen, u32 pos_low, u32 pos_high)
1192{
1193    loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1194    struct file *file;
1195    int fput_needed;
1196    ssize_t ret;
1197
1198    if (pos < 0)
1199        return -EINVAL;
1200    file = fget_light(fd, &fput_needed);
1201    if (!file)
1202        return -EBADF;
1203    ret = -ESPIPE;
1204    if (file->f_mode & FMODE_PREAD)
1205        ret = compat_readv(file, vec, vlen, &pos);
1206    fput_light(file, fput_needed);
1207    return ret;
1208}
1209
1210static size_t compat_writev(struct file *file,
1211                const struct compat_iovec __user *vec,
1212                unsigned long vlen, loff_t *pos)
1213{
1214    ssize_t ret = -EBADF;
1215
1216    if (!(file->f_mode & FMODE_WRITE))
1217        goto out;
1218
1219    ret = -EINVAL;
1220    if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1221        goto out;
1222
1223    ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1224
1225out:
1226    if (ret > 0)
1227        add_wchar(current, ret);
1228    inc_syscw(current);
1229    return ret;
1230}
1231
1232asmlinkage ssize_t
1233compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1234          unsigned long vlen)
1235{
1236    struct file *file;
1237    int fput_needed;
1238    ssize_t ret;
1239
1240    file = fget_light(fd, &fput_needed);
1241    if (!file)
1242        return -EBADF;
1243    ret = compat_writev(file, vec, vlen, &file->f_pos);
1244    fput_light(file, fput_needed);
1245    return ret;
1246}
1247
1248asmlinkage ssize_t
1249compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1250           unsigned long vlen, u32 pos_low, u32 pos_high)
1251{
1252    loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1253    struct file *file;
1254    int fput_needed;
1255    ssize_t ret;
1256
1257    if (pos < 0)
1258        return -EINVAL;
1259    file = fget_light(fd, &fput_needed);
1260    if (!file)
1261        return -EBADF;
1262    ret = -ESPIPE;
1263    if (file->f_mode & FMODE_PWRITE)
1264        ret = compat_writev(file, vec, vlen, &pos);
1265    fput_light(file, fput_needed);
1266    return ret;
1267}
1268
1269asmlinkage long
1270compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1271            unsigned int nr_segs, unsigned int flags)
1272{
1273    unsigned i;
1274    struct iovec __user *iov;
1275    if (nr_segs > UIO_MAXIOV)
1276        return -EINVAL;
1277    iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1278    for (i = 0; i < nr_segs; i++) {
1279        struct compat_iovec v;
1280        if (get_user(v.iov_base, &iov32[i].iov_base) ||
1281            get_user(v.iov_len, &iov32[i].iov_len) ||
1282            put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1283            put_user(v.iov_len, &iov[i].iov_len))
1284            return -EFAULT;
1285    }
1286    return sys_vmsplice(fd, iov, nr_segs, flags);
1287}
1288
1289/*
1290 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1291 * O_LARGEFILE flag.
1292 */
1293asmlinkage long
1294compat_sys_open(const char __user *filename, int flags, int mode)
1295{
1296    return do_sys_open(AT_FDCWD, filename, flags, mode);
1297}
1298
1299/*
1300 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1301 * O_LARGEFILE flag.
1302 */
1303asmlinkage long
1304compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1305{
1306    return do_sys_open(dfd, filename, flags, mode);
1307}
1308
1309#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1310
1311static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1312                      int timeval, int ret)
1313{
1314    struct timespec ts;
1315
1316    if (!p)
1317        return ret;
1318
1319    if (current->personality & STICKY_TIMEOUTS)
1320        goto sticky;
1321
1322    /* No update for zero timeout */
1323    if (!end_time->tv_sec && !end_time->tv_nsec)
1324        return ret;
1325
1326    ktime_get_ts(&ts);
1327    ts = timespec_sub(*end_time, ts);
1328    if (ts.tv_sec < 0)
1329        ts.tv_sec = ts.tv_nsec = 0;
1330
1331    if (timeval) {
1332        struct compat_timeval rtv;
1333
1334        rtv.tv_sec = ts.tv_sec;
1335        rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1336
1337        if (!copy_to_user(p, &rtv, sizeof(rtv)))
1338            return ret;
1339    } else {
1340        struct compat_timespec rts;
1341
1342        rts.tv_sec = ts.tv_sec;
1343        rts.tv_nsec = ts.tv_nsec;
1344
1345        if (!copy_to_user(p, &rts, sizeof(rts)))
1346            return ret;
1347    }
1348    /*
1349     * If an application puts its timeval in read-only memory, we
1350     * don't want the Linux-specific update to the timeval to
1351     * cause a fault after the select has completed
1352     * successfully. However, because we're not updating the
1353     * timeval, we can't restart the system call.
1354     */
1355
1356sticky:
1357    if (ret == -ERESTARTNOHAND)
1358        ret = -EINTR;
1359    return ret;
1360}
1361
1362/*
1363 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1364 * 64-bit unsigned longs.
1365 */
1366static
1367int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1368            unsigned long *fdset)
1369{
1370    nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1371    if (ufdset) {
1372        unsigned long odd;
1373
1374        if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1375            return -EFAULT;
1376
1377        odd = nr & 1UL;
1378        nr &= ~1UL;
1379        while (nr) {
1380            unsigned long h, l;
1381            if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1382                return -EFAULT;
1383            ufdset += 2;
1384            *fdset++ = h << 32 | l;
1385            nr -= 2;
1386        }
1387        if (odd && __get_user(*fdset, ufdset))
1388            return -EFAULT;
1389    } else {
1390        /* Tricky, must clear full unsigned long in the
1391         * kernel fdset at the end, this makes sure that
1392         * actually happens.
1393         */
1394        memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1395    }
1396    return 0;
1397}
1398
1399static
1400int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1401              unsigned long *fdset)
1402{
1403    unsigned long odd;
1404    nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1405
1406    if (!ufdset)
1407        return 0;
1408
1409    odd = nr & 1UL;
1410    nr &= ~1UL;
1411    while (nr) {
1412        unsigned long h, l;
1413        l = *fdset++;
1414        h = l >> 32;
1415        if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1416            return -EFAULT;
1417        ufdset += 2;
1418        nr -= 2;
1419    }
1420    if (odd && __put_user(*fdset, ufdset))
1421        return -EFAULT;
1422    return 0;
1423}
1424
1425
1426/*
1427 * This is a virtual copy of sys_select from fs/select.c and probably
1428 * should be compared to it from time to time
1429 */
1430
1431/*
1432 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1433 * like to be certain this leads to no problems. So I return
1434 * EINTR just for safety.
1435 *
1436 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1437 * I'm trying ERESTARTNOHAND which restart only when you want to.
1438 */
1439int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1440    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1441    struct timespec *end_time)
1442{
1443    fd_set_bits fds;
1444    void *bits;
1445    int size, max_fds, ret = -EINVAL;
1446    struct fdtable *fdt;
1447    long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1448
1449    if (n < 0)
1450        goto out_nofds;
1451
1452    /* max_fds can increase, so grab it once to avoid race */
1453    rcu_read_lock();
1454    fdt = files_fdtable(current->files);
1455    max_fds = fdt->max_fds;
1456    rcu_read_unlock();
1457    if (n > max_fds)
1458        n = max_fds;
1459
1460    /*
1461     * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1462     * since we used fdset we need to allocate memory in units of
1463     * long-words.
1464     */
1465    size = FDS_BYTES(n);
1466    bits = stack_fds;
1467    if (size > sizeof(stack_fds) / 6) {
1468        bits = kmalloc(6 * size, GFP_KERNEL);
1469        ret = -ENOMEM;
1470        if (!bits)
1471            goto out_nofds;
1472    }
1473    fds.in = (unsigned long *) bits;
1474    fds.out = (unsigned long *) (bits + size);
1475    fds.ex = (unsigned long *) (bits + 2*size);
1476    fds.res_in = (unsigned long *) (bits + 3*size);
1477    fds.res_out = (unsigned long *) (bits + 4*size);
1478    fds.res_ex = (unsigned long *) (bits + 5*size);
1479
1480    if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1481        (ret = compat_get_fd_set(n, outp, fds.out)) ||
1482        (ret = compat_get_fd_set(n, exp, fds.ex)))
1483        goto out;
1484    zero_fd_set(n, fds.res_in);
1485    zero_fd_set(n, fds.res_out);
1486    zero_fd_set(n, fds.res_ex);
1487
1488    ret = do_select(n, &fds, end_time);
1489
1490    if (ret < 0)
1491        goto out;
1492    if (!ret) {
1493        ret = -ERESTARTNOHAND;
1494        if (signal_pending(current))
1495            goto out;
1496        ret = 0;
1497    }
1498
1499    if (compat_set_fd_set(n, inp, fds.res_in) ||
1500        compat_set_fd_set(n, outp, fds.res_out) ||
1501        compat_set_fd_set(n, exp, fds.res_ex))
1502        ret = -EFAULT;
1503out:
1504    if (bits != stack_fds)
1505        kfree(bits);
1506out_nofds:
1507    return ret;
1508}
1509
1510asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1511    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1512    struct compat_timeval __user *tvp)
1513{
1514    struct timespec end_time, *to = NULL;
1515    struct compat_timeval tv;
1516    int ret;
1517
1518    if (tvp) {
1519        if (copy_from_user(&tv, tvp, sizeof(tv)))
1520            return -EFAULT;
1521
1522        to = &end_time;
1523        if (poll_select_set_timeout(to,
1524                tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1525                (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1526            return -EINVAL;
1527    }
1528
1529    ret = compat_core_sys_select(n, inp, outp, exp, to);
1530    ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1531
1532    return ret;
1533}
1534
1535struct compat_sel_arg_struct {
1536    compat_ulong_t n;
1537    compat_uptr_t inp;
1538    compat_uptr_t outp;
1539    compat_uptr_t exp;
1540    compat_uptr_t tvp;
1541};
1542
1543asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1544{
1545    struct compat_sel_arg_struct a;
1546
1547    if (copy_from_user(&a, arg, sizeof(a)))
1548        return -EFAULT;
1549    return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1550                 compat_ptr(a.exp), compat_ptr(a.tvp));
1551}
1552
1553#ifdef HAVE_SET_RESTORE_SIGMASK
1554static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1555    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1556    struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1557    compat_size_t sigsetsize)
1558{
1559    compat_sigset_t ss32;
1560    sigset_t ksigmask, sigsaved;
1561    struct compat_timespec ts;
1562    struct timespec end_time, *to = NULL;
1563    int ret;
1564
1565    if (tsp) {
1566        if (copy_from_user(&ts, tsp, sizeof(ts)))
1567            return -EFAULT;
1568
1569        to = &end_time;
1570        if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1571            return -EINVAL;
1572    }
1573
1574    if (sigmask) {
1575        if (sigsetsize != sizeof(compat_sigset_t))
1576            return -EINVAL;
1577        if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1578            return -EFAULT;
1579        sigset_from_compat(&ksigmask, &ss32);
1580
1581        sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1582        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1583    }
1584
1585    ret = compat_core_sys_select(n, inp, outp, exp, to);
1586    ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1587
1588    if (ret == -ERESTARTNOHAND) {
1589        /*
1590         * Don't restore the signal mask yet. Let do_signal() deliver
1591         * the signal on the way back to userspace, before the signal
1592         * mask is restored.
1593         */
1594        if (sigmask) {
1595            memcpy(&current->saved_sigmask, &sigsaved,
1596                    sizeof(sigsaved));
1597            set_restore_sigmask();
1598        }
1599    } else if (sigmask)
1600        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1601
1602    return ret;
1603}
1604
1605asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1606    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1607    struct compat_timespec __user *tsp, void __user *sig)
1608{
1609    compat_size_t sigsetsize = 0;
1610    compat_uptr_t up = 0;
1611
1612    if (sig) {
1613        if (!access_ok(VERIFY_READ, sig,
1614                sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1615                __get_user(up, (compat_uptr_t __user *)sig) ||
1616                __get_user(sigsetsize,
1617                (compat_size_t __user *)(sig+sizeof(up))))
1618            return -EFAULT;
1619    }
1620    return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1621                 sigsetsize);
1622}
1623
1624asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1625    unsigned int nfds, struct compat_timespec __user *tsp,
1626    const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1627{
1628    compat_sigset_t ss32;
1629    sigset_t ksigmask, sigsaved;
1630    struct compat_timespec ts;
1631    struct timespec end_time, *to = NULL;
1632    int ret;
1633
1634    if (tsp) {
1635        if (copy_from_user(&ts, tsp, sizeof(ts)))
1636            return -EFAULT;
1637
1638        to = &end_time;
1639        if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1640            return -EINVAL;
1641    }
1642
1643    if (sigmask) {
1644        if (sigsetsize != sizeof(compat_sigset_t))
1645            return -EINVAL;
1646        if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1647            return -EFAULT;
1648        sigset_from_compat(&ksigmask, &ss32);
1649
1650        sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1651        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1652    }
1653
1654    ret = do_sys_poll(ufds, nfds, to);
1655
1656    /* We can restart this syscall, usually */
1657    if (ret == -EINTR) {
1658        /*
1659         * Don't restore the signal mask yet. Let do_signal() deliver
1660         * the signal on the way back to userspace, before the signal
1661         * mask is restored.
1662         */
1663        if (sigmask) {
1664            memcpy(&current->saved_sigmask, &sigsaved,
1665                sizeof(sigsaved));
1666            set_restore_sigmask();
1667        }
1668        ret = -ERESTARTNOHAND;
1669    } else if (sigmask)
1670        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1671
1672    ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1673
1674    return ret;
1675}
1676#endif /* HAVE_SET_RESTORE_SIGMASK */
1677
1678#if (defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)) && !defined(CONFIG_NFSD_DEPRECATED)
1679/* Stuff for NFS server syscalls... */
1680struct compat_nfsctl_svc {
1681    u16 svc32_port;
1682    s32 svc32_nthreads;
1683};
1684
1685struct compat_nfsctl_client {
1686    s8 cl32_ident[NFSCLNT_IDMAX+1];
1687    s32 cl32_naddr;
1688    struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1689    s32 cl32_fhkeytype;
1690    s32 cl32_fhkeylen;
1691    u8 cl32_fhkey[NFSCLNT_KEYMAX];
1692};
1693
1694struct compat_nfsctl_export {
1695    char ex32_client[NFSCLNT_IDMAX+1];
1696    char ex32_path[NFS_MAXPATHLEN+1];
1697    compat_dev_t ex32_dev;
1698    compat_ino_t ex32_ino;
1699    compat_int_t ex32_flags;
1700    __compat_uid_t ex32_anon_uid;
1701    __compat_gid_t ex32_anon_gid;
1702};
1703
1704struct compat_nfsctl_fdparm {
1705    struct sockaddr gd32_addr;
1706    s8 gd32_path[NFS_MAXPATHLEN+1];
1707    compat_int_t gd32_version;
1708};
1709
1710struct compat_nfsctl_fsparm {
1711    struct sockaddr gd32_addr;
1712    s8 gd32_path[NFS_MAXPATHLEN+1];
1713    compat_int_t gd32_maxlen;
1714};
1715
1716struct compat_nfsctl_arg {
1717    compat_int_t ca32_version; /* safeguard */
1718    union {
1719        struct compat_nfsctl_svc u32_svc;
1720        struct compat_nfsctl_client u32_client;
1721        struct compat_nfsctl_export u32_export;
1722        struct compat_nfsctl_fdparm u32_getfd;
1723        struct compat_nfsctl_fsparm u32_getfs;
1724    } u;
1725#define ca32_svc u.u32_svc
1726#define ca32_client u.u32_client
1727#define ca32_export u.u32_export
1728#define ca32_getfd u.u32_getfd
1729#define ca32_getfs u.u32_getfs
1730};
1731
1732union compat_nfsctl_res {
1733    __u8 cr32_getfh[NFS_FHSIZE];
1734    struct knfsd_fh cr32_getfs;
1735};
1736
1737static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1738                struct compat_nfsctl_arg __user *arg)
1739{
1740    if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1741        get_user(karg->ca_version, &arg->ca32_version) ||
1742        __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1743        __get_user(karg->ca_svc.svc_nthreads,
1744                &arg->ca32_svc.svc32_nthreads))
1745        return -EFAULT;
1746    return 0;
1747}
1748
1749static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1750                struct compat_nfsctl_arg __user *arg)
1751{
1752    if (!access_ok(VERIFY_READ, &arg->ca32_client,
1753            sizeof(arg->ca32_client)) ||
1754        get_user(karg->ca_version, &arg->ca32_version) ||
1755        __copy_from_user(&karg->ca_client.cl_ident[0],
1756                &arg->ca32_client.cl32_ident[0],
1757                NFSCLNT_IDMAX) ||
1758        __get_user(karg->ca_client.cl_naddr,
1759                &arg->ca32_client.cl32_naddr) ||
1760        __copy_from_user(&karg->ca_client.cl_addrlist[0],
1761                &arg->ca32_client.cl32_addrlist[0],
1762                (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1763        __get_user(karg->ca_client.cl_fhkeytype,
1764                &arg->ca32_client.cl32_fhkeytype) ||
1765        __get_user(karg->ca_client.cl_fhkeylen,
1766                &arg->ca32_client.cl32_fhkeylen) ||
1767        __copy_from_user(&karg->ca_client.cl_fhkey[0],
1768                &arg->ca32_client.cl32_fhkey[0],
1769                NFSCLNT_KEYMAX))
1770        return -EFAULT;
1771
1772    return 0;
1773}
1774
1775static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1776                struct compat_nfsctl_arg __user *arg)
1777{
1778    if (!access_ok(VERIFY_READ, &arg->ca32_export,
1779                sizeof(arg->ca32_export)) ||
1780        get_user(karg->ca_version, &arg->ca32_version) ||
1781        __copy_from_user(&karg->ca_export.ex_client[0],
1782                &arg->ca32_export.ex32_client[0],
1783                NFSCLNT_IDMAX) ||
1784        __copy_from_user(&karg->ca_export.ex_path[0],
1785                &arg->ca32_export.ex32_path[0],
1786                NFS_MAXPATHLEN) ||
1787        __get_user(karg->ca_export.ex_dev,
1788                &arg->ca32_export.ex32_dev) ||
1789        __get_user(karg->ca_export.ex_ino,
1790                &arg->ca32_export.ex32_ino) ||
1791        __get_user(karg->ca_export.ex_flags,
1792                &arg->ca32_export.ex32_flags) ||
1793        __get_user(karg->ca_export.ex_anon_uid,
1794                &arg->ca32_export.ex32_anon_uid) ||
1795        __get_user(karg->ca_export.ex_anon_gid,
1796                &arg->ca32_export.ex32_anon_gid))
1797        return -EFAULT;
1798    SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1799    SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1800
1801    return 0;
1802}
1803
1804static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
1805                struct compat_nfsctl_arg __user *arg)
1806{
1807    if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
1808            sizeof(arg->ca32_getfd)) ||
1809        get_user(karg->ca_version, &arg->ca32_version) ||
1810        __copy_from_user(&karg->ca_getfd.gd_addr,
1811                &arg->ca32_getfd.gd32_addr,
1812                (sizeof(struct sockaddr))) ||
1813        __copy_from_user(&karg->ca_getfd.gd_path,
1814                &arg->ca32_getfd.gd32_path,
1815                (NFS_MAXPATHLEN+1)) ||
1816        __get_user(karg->ca_getfd.gd_version,
1817                &arg->ca32_getfd.gd32_version))
1818        return -EFAULT;
1819
1820    return 0;
1821}
1822
1823static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
1824                struct compat_nfsctl_arg __user *arg)
1825{
1826    if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
1827        get_user(karg->ca_version, &arg->ca32_version) ||
1828        __copy_from_user(&karg->ca_getfs.gd_addr,
1829                &arg->ca32_getfs.gd32_addr,
1830                (sizeof(struct sockaddr))) ||
1831        __copy_from_user(&karg->ca_getfs.gd_path,
1832                &arg->ca32_getfs.gd32_path,
1833                (NFS_MAXPATHLEN+1)) ||
1834        __get_user(karg->ca_getfs.gd_maxlen,
1835                &arg->ca32_getfs.gd32_maxlen))
1836        return -EFAULT;
1837
1838    return 0;
1839}
1840
1841/* This really doesn't need translations, we are only passing
1842 * back a union which contains opaque nfs file handle data.
1843 */
1844static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
1845                union compat_nfsctl_res __user *res)
1846{
1847    int err;
1848
1849    err = copy_to_user(res, kres, sizeof(*res));
1850
1851    return (err) ? -EFAULT : 0;
1852}
1853
1854asmlinkage long compat_sys_nfsservctl(int cmd,
1855                struct compat_nfsctl_arg __user *arg,
1856                union compat_nfsctl_res __user *res)
1857{
1858    struct nfsctl_arg *karg;
1859    union nfsctl_res *kres;
1860    mm_segment_t oldfs;
1861    int err;
1862
1863    karg = kmalloc(sizeof(*karg), GFP_USER);
1864    kres = kmalloc(sizeof(*kres), GFP_USER);
1865    if(!karg || !kres) {
1866        err = -ENOMEM;
1867        goto done;
1868    }
1869
1870    switch(cmd) {
1871    case NFSCTL_SVC:
1872        err = compat_nfs_svc_trans(karg, arg);
1873        break;
1874
1875    case NFSCTL_ADDCLIENT:
1876        err = compat_nfs_clnt_trans(karg, arg);
1877        break;
1878
1879    case NFSCTL_DELCLIENT:
1880        err = compat_nfs_clnt_trans(karg, arg);
1881        break;
1882
1883    case NFSCTL_EXPORT:
1884    case NFSCTL_UNEXPORT:
1885        err = compat_nfs_exp_trans(karg, arg);
1886        break;
1887
1888    case NFSCTL_GETFD:
1889        err = compat_nfs_getfd_trans(karg, arg);
1890        break;
1891
1892    case NFSCTL_GETFS:
1893        err = compat_nfs_getfs_trans(karg, arg);
1894        break;
1895
1896    default:
1897        err = -EINVAL;
1898        break;
1899    }
1900
1901    if (err)
1902        goto done;
1903
1904    oldfs = get_fs();
1905    set_fs(KERNEL_DS);
1906    /* The __user pointer casts are valid because of the set_fs() */
1907    err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
1908    set_fs(oldfs);
1909
1910    if (err)
1911        goto done;
1912
1913    if((cmd == NFSCTL_GETFD) ||
1914       (cmd == NFSCTL_GETFS))
1915        err = compat_nfs_getfh_res_trans(kres, res);
1916
1917done:
1918    kfree(karg);
1919    kfree(kres);
1920    return err;
1921}
1922#else /* !NFSD */
1923long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
1924{
1925    return sys_ni_syscall();
1926}
1927#endif
1928
1929#ifdef CONFIG_EPOLL
1930
1931#ifdef HAVE_SET_RESTORE_SIGMASK
1932asmlinkage long compat_sys_epoll_pwait(int epfd,
1933            struct compat_epoll_event __user *events,
1934            int maxevents, int timeout,
1935            const compat_sigset_t __user *sigmask,
1936            compat_size_t sigsetsize)
1937{
1938    long err;
1939    compat_sigset_t csigmask;
1940    sigset_t ksigmask, sigsaved;
1941
1942    /*
1943     * If the caller wants a certain signal mask to be set during the wait,
1944     * we apply it here.
1945     */
1946    if (sigmask) {
1947        if (sigsetsize != sizeof(compat_sigset_t))
1948            return -EINVAL;
1949        if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1950            return -EFAULT;
1951        sigset_from_compat(&ksigmask, &csigmask);
1952        sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1953        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1954    }
1955
1956    err = sys_epoll_wait(epfd, events, maxevents, timeout);
1957
1958    /*
1959     * If we changed the signal mask, we need to restore the original one.
1960     * In case we've got a signal while waiting, we do not restore the
1961     * signal mask yet, and we allow do_signal() to deliver the signal on
1962     * the way back to userspace, before the signal mask is restored.
1963     */
1964    if (sigmask) {
1965        if (err == -EINTR) {
1966            memcpy(&current->saved_sigmask, &sigsaved,
1967                   sizeof(sigsaved));
1968            set_restore_sigmask();
1969        } else
1970            sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1971    }
1972
1973    return err;
1974}
1975#endif /* HAVE_SET_RESTORE_SIGMASK */
1976
1977#endif /* CONFIG_EPOLL */
1978
1979#ifdef CONFIG_SIGNALFD
1980
1981asmlinkage long compat_sys_signalfd4(int ufd,
1982                     const compat_sigset_t __user *sigmask,
1983                     compat_size_t sigsetsize, int flags)
1984{
1985    compat_sigset_t ss32;
1986    sigset_t tmp;
1987    sigset_t __user *ksigmask;
1988
1989    if (sigsetsize != sizeof(compat_sigset_t))
1990        return -EINVAL;
1991    if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1992        return -EFAULT;
1993    sigset_from_compat(&tmp, &ss32);
1994    ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1995    if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1996        return -EFAULT;
1997
1998    return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
1999}
2000
2001asmlinkage long compat_sys_signalfd(int ufd,
2002                    const compat_sigset_t __user *sigmask,
2003                    compat_size_t sigsetsize)
2004{
2005    return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2006}
2007#endif /* CONFIG_SIGNALFD */
2008
2009#ifdef CONFIG_TIMERFD
2010
2011asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2012                   const struct compat_itimerspec __user *utmr,
2013                   struct compat_itimerspec __user *otmr)
2014{
2015    int error;
2016    struct itimerspec t;
2017    struct itimerspec __user *ut;
2018
2019    if (get_compat_itimerspec(&t, utmr))
2020        return -EFAULT;
2021    ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2022    if (copy_to_user(&ut[0], &t, sizeof(t)))
2023        return -EFAULT;
2024    error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2025    if (!error && otmr)
2026        error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2027             put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2028
2029    return error;
2030}
2031
2032asmlinkage long compat_sys_timerfd_gettime(int ufd,
2033                   struct compat_itimerspec __user *otmr)
2034{
2035    int error;
2036    struct itimerspec t;
2037    struct itimerspec __user *ut;
2038
2039    ut = compat_alloc_user_space(sizeof(struct itimerspec));
2040    error = sys_timerfd_gettime(ufd, ut);
2041    if (!error)
2042        error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2043             put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2044
2045    return error;
2046}
2047
2048#endif /* CONFIG_TIMERFD */
2049
2050#ifdef CONFIG_FHANDLE
2051/*
2052 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
2053 * doesn't set the O_LARGEFILE flag.
2054 */
2055asmlinkage long
2056compat_sys_open_by_handle_at(int mountdirfd,
2057                 struct file_handle __user *handle, int flags)
2058{
2059    return do_handle_open(mountdirfd, handle, flags);
2060}
2061#endif
2062

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