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@suse.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/kernel.h>
19#include <linux/linkage.h>
20#include <linux/compat.h>
21#include <linux/errno.h>
22#include <linux/time.h>
23#include <linux/fs.h>
24#include <linux/fcntl.h>
25#include <linux/namei.h>
26#include <linux/file.h>
27#include <linux/fdtable.h>
28#include <linux/vfs.h>
29#include <linux/ioctl.h>
30#include <linux/init.h>
31#include <linux/smb.h>
32#include <linux/smb_mount.h>
33#include <linux/ncp_mount.h>
34#include <linux/nfs4_mount.h>
35#include <linux/syscalls.h>
36#include <linux/ctype.h>
37#include <linux/module.h>
38#include <linux/dirent.h>
39#include <linux/fsnotify.h>
40#include <linux/highuid.h>
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/syscall.h>
44#include <linux/personality.h>
45#include <linux/rwsem.h>
46#include <linux/tsacct_kern.h>
47#include <linux/security.h>
48#include <linux/highmem.h>
49#include <linux/signal.h>
50#include <linux/poll.h>
51#include <linux/mm.h>
52#include <linux/eventpoll.h>
53#include <linux/fs_struct.h>
54
55#include <asm/uaccess.h>
56#include <asm/mmu_context.h>
57#include <asm/ioctls.h>
58#include "internal.h"
59
60int compat_log = 1;
61
62int compat_printk(const char *fmt, ...)
63{
64    va_list ap;
65    int ret;
66    if (!compat_log)
67        return 0;
68    va_start(ap, fmt);
69    ret = vprintk(fmt, ap);
70    va_end(ap);
71    return ret;
72}
73
74#include "read_write.h"
75
76/*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80asmlinkage long compat_sys_utime(char __user *filename, 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, 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[0].tv_nsec == UTIME_NOW)
104            && tv[0].tv_sec != 0)
105            return -EINVAL;
106        if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
107            && tv[1].tv_sec != 0)
108            return -EINVAL;
109
110        if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
111            return 0;
112    }
113    return do_utimes(dfd, filename, t ? tv : NULL, flags);
114}
115
116asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
117{
118    struct timespec tv[2];
119
120    if (t) {
121        if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
122            get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
123            get_user(tv[1].tv_sec, &t[1].tv_sec) ||
124            get_user(tv[1].tv_nsec, &t[1].tv_usec))
125            return -EFAULT;
126        if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
127            tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
128            return -EINVAL;
129        tv[0].tv_nsec *= 1000;
130        tv[1].tv_nsec *= 1000;
131    }
132    return do_utimes(dfd, filename, t ? tv : NULL, 0);
133}
134
135asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
136{
137    return compat_sys_futimesat(AT_FDCWD, filename, t);
138}
139
140static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
141{
142    compat_ino_t ino = stat->ino;
143    typeof(ubuf->st_uid) uid = 0;
144    typeof(ubuf->st_gid) gid = 0;
145    int err;
146
147    SET_UID(uid, stat->uid);
148    SET_GID(gid, stat->gid);
149
150    if ((u64) stat->size > MAX_NON_LFS ||
151        !old_valid_dev(stat->dev) ||
152        !old_valid_dev(stat->rdev))
153        return -EOVERFLOW;
154    if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
155        return -EOVERFLOW;
156
157    if (clear_user(ubuf, sizeof(*ubuf)))
158        return -EFAULT;
159
160    err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
161    err |= __put_user(ino, &ubuf->st_ino);
162    err |= __put_user(stat->mode, &ubuf->st_mode);
163    err |= __put_user(stat->nlink, &ubuf->st_nlink);
164    err |= __put_user(uid, &ubuf->st_uid);
165    err |= __put_user(gid, &ubuf->st_gid);
166    err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
167    err |= __put_user(stat->size, &ubuf->st_size);
168    err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
169    err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
170    err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
171    err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
172    err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
173    err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
174    err |= __put_user(stat->blksize, &ubuf->st_blksize);
175    err |= __put_user(stat->blocks, &ubuf->st_blocks);
176    return err;
177}
178
179asmlinkage long compat_sys_newstat(char __user * filename,
180        struct compat_stat __user *statbuf)
181{
182    struct kstat stat;
183    int error;
184
185    error = vfs_stat(filename, &stat);
186    if (error)
187        return error;
188    return cp_compat_stat(&stat, statbuf);
189}
190
191asmlinkage long compat_sys_newlstat(char __user * filename,
192        struct compat_stat __user *statbuf)
193{
194    struct kstat stat;
195    int error;
196
197    error = vfs_lstat(filename, &stat);
198    if (error)
199        return error;
200    return cp_compat_stat(&stat, statbuf);
201}
202
203#ifndef __ARCH_WANT_STAT64
204asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
205        struct compat_stat __user *statbuf, int flag)
206{
207    struct kstat stat;
208    int error;
209
210    error = vfs_fstatat(dfd, filename, &stat, flag);
211    if (error)
212        return error;
213    return cp_compat_stat(&stat, statbuf);
214}
215#endif
216
217asmlinkage long compat_sys_newfstat(unsigned int fd,
218        struct compat_stat __user * statbuf)
219{
220    struct kstat stat;
221    int error = vfs_fstat(fd, &stat);
222
223    if (!error)
224        error = cp_compat_stat(&stat, statbuf);
225    return error;
226}
227
228static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
229{
230    
231    if (sizeof ubuf->f_blocks == 4) {
232        if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
233             kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
234            return -EOVERFLOW;
235        /* f_files and f_ffree may be -1; it's okay
236         * to stuff that into 32 bits */
237        if (kbuf->f_files != 0xffffffffffffffffULL
238         && (kbuf->f_files & 0xffffffff00000000ULL))
239            return -EOVERFLOW;
240        if (kbuf->f_ffree != 0xffffffffffffffffULL
241         && (kbuf->f_ffree & 0xffffffff00000000ULL))
242            return -EOVERFLOW;
243    }
244    if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
245        __put_user(kbuf->f_type, &ubuf->f_type) ||
246        __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
247        __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
248        __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
249        __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
250        __put_user(kbuf->f_files, &ubuf->f_files) ||
251        __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
252        __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
253        __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
254        __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
255        __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
256        __put_user(0, &ubuf->f_spare[0]) ||
257        __put_user(0, &ubuf->f_spare[1]) ||
258        __put_user(0, &ubuf->f_spare[2]) ||
259        __put_user(0, &ubuf->f_spare[3]) ||
260        __put_user(0, &ubuf->f_spare[4]))
261        return -EFAULT;
262    return 0;
263}
264
265/*
266 * The following statfs calls are copies of code from fs/open.c and
267 * should be checked against those from time to time
268 */
269asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
270{
271    struct path path;
272    int error;
273
274    error = user_path(pathname, &path);
275    if (!error) {
276        struct kstatfs tmp;
277        error = vfs_statfs(path.dentry, &tmp);
278        if (!error)
279            error = put_compat_statfs(buf, &tmp);
280        path_put(&path);
281    }
282    return error;
283}
284
285asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
286{
287    struct file * file;
288    struct kstatfs tmp;
289    int error;
290
291    error = -EBADF;
292    file = fget(fd);
293    if (!file)
294        goto out;
295    error = vfs_statfs(file->f_path.dentry, &tmp);
296    if (!error)
297        error = put_compat_statfs(buf, &tmp);
298    fput(file);
299out:
300    return error;
301}
302
303static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
304{
305    if (sizeof ubuf->f_blocks == 4) {
306        if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
307             kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
308            return -EOVERFLOW;
309        /* f_files and f_ffree may be -1; it's okay
310         * to stuff that into 32 bits */
311        if (kbuf->f_files != 0xffffffffffffffffULL
312         && (kbuf->f_files & 0xffffffff00000000ULL))
313            return -EOVERFLOW;
314        if (kbuf->f_ffree != 0xffffffffffffffffULL
315         && (kbuf->f_ffree & 0xffffffff00000000ULL))
316            return -EOVERFLOW;
317    }
318    if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
319        __put_user(kbuf->f_type, &ubuf->f_type) ||
320        __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
321        __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
322        __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
323        __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
324        __put_user(kbuf->f_files, &ubuf->f_files) ||
325        __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
326        __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
327        __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
328        __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
329        __put_user(kbuf->f_frsize, &ubuf->f_frsize))
330        return -EFAULT;
331    return 0;
332}
333
334asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
335{
336    struct path path;
337    int error;
338
339    if (sz != sizeof(*buf))
340        return -EINVAL;
341
342    error = user_path(pathname, &path);
343    if (!error) {
344        struct kstatfs tmp;
345        error = vfs_statfs(path.dentry, &tmp);
346        if (!error)
347            error = put_compat_statfs64(buf, &tmp);
348        path_put(&path);
349    }
350    return error;
351}
352
353asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
354{
355    struct file * file;
356    struct kstatfs tmp;
357    int error;
358
359    if (sz != sizeof(*buf))
360        return -EINVAL;
361
362    error = -EBADF;
363    file = fget(fd);
364    if (!file)
365        goto out;
366    error = vfs_statfs(file->f_path.dentry, &tmp);
367    if (!error)
368        error = put_compat_statfs64(buf, &tmp);
369    fput(file);
370out:
371    return error;
372}
373
374/*
375 * This is a copy of sys_ustat, just dealing with a structure layout.
376 * Given how simple this syscall is that apporach is more maintainable
377 * than the various conversion hacks.
378 */
379asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
380{
381    struct super_block *sb;
382    struct compat_ustat tmp;
383    struct kstatfs sbuf;
384    int err;
385
386    sb = user_get_super(new_decode_dev(dev));
387    if (!sb)
388        return -EINVAL;
389    err = vfs_statfs(sb->s_root, &sbuf);
390    drop_super(sb);
391    if (err)
392        return err;
393
394    memset(&tmp, 0, sizeof(struct compat_ustat));
395    tmp.f_tfree = sbuf.f_bfree;
396    tmp.f_tinode = sbuf.f_ffree;
397    if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
398        return -EFAULT;
399    return 0;
400}
401
402static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
403{
404    if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
405        __get_user(kfl->l_type, &ufl->l_type) ||
406        __get_user(kfl->l_whence, &ufl->l_whence) ||
407        __get_user(kfl->l_start, &ufl->l_start) ||
408        __get_user(kfl->l_len, &ufl->l_len) ||
409        __get_user(kfl->l_pid, &ufl->l_pid))
410        return -EFAULT;
411    return 0;
412}
413
414static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
415{
416    if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
417        __put_user(kfl->l_type, &ufl->l_type) ||
418        __put_user(kfl->l_whence, &ufl->l_whence) ||
419        __put_user(kfl->l_start, &ufl->l_start) ||
420        __put_user(kfl->l_len, &ufl->l_len) ||
421        __put_user(kfl->l_pid, &ufl->l_pid))
422        return -EFAULT;
423    return 0;
424}
425
426#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
427static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
428{
429    if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
430        __get_user(kfl->l_type, &ufl->l_type) ||
431        __get_user(kfl->l_whence, &ufl->l_whence) ||
432        __get_user(kfl->l_start, &ufl->l_start) ||
433        __get_user(kfl->l_len, &ufl->l_len) ||
434        __get_user(kfl->l_pid, &ufl->l_pid))
435        return -EFAULT;
436    return 0;
437}
438#endif
439
440#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
441static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
442{
443    if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
444        __put_user(kfl->l_type, &ufl->l_type) ||
445        __put_user(kfl->l_whence, &ufl->l_whence) ||
446        __put_user(kfl->l_start, &ufl->l_start) ||
447        __put_user(kfl->l_len, &ufl->l_len) ||
448        __put_user(kfl->l_pid, &ufl->l_pid))
449        return -EFAULT;
450    return 0;
451}
452#endif
453
454asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
455        unsigned long arg)
456{
457    mm_segment_t old_fs;
458    struct flock f;
459    long ret;
460
461    switch (cmd) {
462    case F_GETLK:
463    case F_SETLK:
464    case F_SETLKW:
465        ret = get_compat_flock(&f, compat_ptr(arg));
466        if (ret != 0)
467            break;
468        old_fs = get_fs();
469        set_fs(KERNEL_DS);
470        ret = sys_fcntl(fd, cmd, (unsigned long)&f);
471        set_fs(old_fs);
472        if (cmd == F_GETLK && ret == 0) {
473            /* GETLK was successful and we need to return the data...
474             * but it needs to fit in the compat structure.
475             * l_start shouldn't be too big, unless the original
476             * start + end is greater than COMPAT_OFF_T_MAX, in which
477             * case the app was asking for trouble, so we return
478             * -EOVERFLOW in that case.
479             * l_len could be too big, in which case we just truncate it,
480             * and only allow the app to see that part of the conflicting
481             * lock that might make sense to it anyway
482             */
483
484            if (f.l_start > COMPAT_OFF_T_MAX)
485                ret = -EOVERFLOW;
486            if (f.l_len > COMPAT_OFF_T_MAX)
487                f.l_len = COMPAT_OFF_T_MAX;
488            if (ret == 0)
489                ret = put_compat_flock(&f, compat_ptr(arg));
490        }
491        break;
492
493    case F_GETLK64:
494    case F_SETLK64:
495    case F_SETLKW64:
496        ret = get_compat_flock64(&f, compat_ptr(arg));
497        if (ret != 0)
498            break;
499        old_fs = get_fs();
500        set_fs(KERNEL_DS);
501        ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
502                ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
503                (unsigned long)&f);
504        set_fs(old_fs);
505        if (cmd == F_GETLK64 && ret == 0) {
506            /* need to return lock information - see above for commentary */
507            if (f.l_start > COMPAT_LOFF_T_MAX)
508                ret = -EOVERFLOW;
509            if (f.l_len > COMPAT_LOFF_T_MAX)
510                f.l_len = COMPAT_LOFF_T_MAX;
511            if (ret == 0)
512                ret = put_compat_flock64(&f, compat_ptr(arg));
513        }
514        break;
515
516    default:
517        ret = sys_fcntl(fd, cmd, arg);
518        break;
519    }
520    return ret;
521}
522
523asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
524        unsigned long arg)
525{
526    if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
527        return -EINVAL;
528    return compat_sys_fcntl64(fd, cmd, arg);
529}
530
531asmlinkage long
532compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
533{
534    long ret;
535    aio_context_t ctx64;
536
537    mm_segment_t oldfs = get_fs();
538    if (unlikely(get_user(ctx64, ctx32p)))
539        return -EFAULT;
540
541    set_fs(KERNEL_DS);
542    /* The __user pointer cast is valid because of the set_fs() */
543    ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
544    set_fs(oldfs);
545    /* truncating is ok because it's a user address */
546    if (!ret)
547        ret = put_user((u32) ctx64, ctx32p);
548    return ret;
549}
550
551asmlinkage long
552compat_sys_io_getevents(aio_context_t ctx_id,
553                 unsigned long min_nr,
554                 unsigned long nr,
555                 struct io_event __user *events,
556                 struct compat_timespec __user *timeout)
557{
558    long ret;
559    struct timespec t;
560    struct timespec __user *ut = NULL;
561
562    ret = -EFAULT;
563    if (unlikely(!access_ok(VERIFY_WRITE, events,
564                nr * sizeof(struct io_event))))
565        goto out;
566    if (timeout) {
567        if (get_compat_timespec(&t, timeout))
568            goto out;
569
570        ut = compat_alloc_user_space(sizeof(*ut));
571        if (copy_to_user(ut, &t, sizeof(t)) )
572            goto out;
573    }
574    ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
575out:
576    return ret;
577}
578
579static inline long
580copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
581{
582    compat_uptr_t uptr;
583    int i;
584
585    for (i = 0; i < nr; ++i) {
586        if (get_user(uptr, ptr32 + i))
587            return -EFAULT;
588        if (put_user(compat_ptr(uptr), ptr64 + i))
589            return -EFAULT;
590    }
591    return 0;
592}
593
594#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
595
596asmlinkage long
597compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
598{
599    struct iocb __user * __user *iocb64;
600    long ret;
601
602    if (unlikely(nr < 0))
603        return -EINVAL;
604
605    if (nr > MAX_AIO_SUBMITS)
606        nr = MAX_AIO_SUBMITS;
607    
608    iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
609    ret = copy_iocb(nr, iocb, iocb64);
610    if (!ret)
611        ret = sys_io_submit(ctx_id, nr, iocb64);
612    return ret;
613}
614
615struct compat_ncp_mount_data {
616    compat_int_t version;
617    compat_uint_t ncp_fd;
618    __compat_uid_t mounted_uid;
619    compat_pid_t wdog_pid;
620    unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
621    compat_uint_t time_out;
622    compat_uint_t retry_count;
623    compat_uint_t flags;
624    __compat_uid_t uid;
625    __compat_gid_t gid;
626    compat_mode_t file_mode;
627    compat_mode_t dir_mode;
628};
629
630struct compat_ncp_mount_data_v4 {
631    compat_int_t version;
632    compat_ulong_t flags;
633    compat_ulong_t mounted_uid;
634    compat_long_t wdog_pid;
635    compat_uint_t ncp_fd;
636    compat_uint_t time_out;
637    compat_uint_t retry_count;
638    compat_ulong_t uid;
639    compat_ulong_t gid;
640    compat_ulong_t file_mode;
641    compat_ulong_t dir_mode;
642};
643
644static void *do_ncp_super_data_conv(void *raw_data)
645{
646    int version = *(unsigned int *)raw_data;
647
648    if (version == 3) {
649        struct compat_ncp_mount_data *c_n = raw_data;
650        struct ncp_mount_data *n = raw_data;
651
652        n->dir_mode = c_n->dir_mode;
653        n->file_mode = c_n->file_mode;
654        n->gid = c_n->gid;
655        n->uid = c_n->uid;
656        memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
657        n->wdog_pid = c_n->wdog_pid;
658        n->mounted_uid = c_n->mounted_uid;
659    } else if (version == 4) {
660        struct compat_ncp_mount_data_v4 *c_n = raw_data;
661        struct ncp_mount_data_v4 *n = raw_data;
662
663        n->dir_mode = c_n->dir_mode;
664        n->file_mode = c_n->file_mode;
665        n->gid = c_n->gid;
666        n->uid = c_n->uid;
667        n->retry_count = c_n->retry_count;
668        n->time_out = c_n->time_out;
669        n->ncp_fd = c_n->ncp_fd;
670        n->wdog_pid = c_n->wdog_pid;
671        n->mounted_uid = c_n->mounted_uid;
672        n->flags = c_n->flags;
673    } else if (version != 5) {
674        return NULL;
675    }
676
677    return raw_data;
678}
679
680struct compat_smb_mount_data {
681    compat_int_t version;
682    __compat_uid_t mounted_uid;
683    __compat_uid_t uid;
684    __compat_gid_t gid;
685    compat_mode_t file_mode;
686    compat_mode_t dir_mode;
687};
688
689static void *do_smb_super_data_conv(void *raw_data)
690{
691    struct smb_mount_data *s = raw_data;
692    struct compat_smb_mount_data *c_s = raw_data;
693
694    if (c_s->version != SMB_MOUNT_OLDVERSION)
695        goto out;
696    s->dir_mode = c_s->dir_mode;
697    s->file_mode = c_s->file_mode;
698    s->gid = c_s->gid;
699    s->uid = c_s->uid;
700    s->mounted_uid = c_s->mounted_uid;
701 out:
702    return raw_data;
703}
704
705struct compat_nfs_string {
706    compat_uint_t len;
707    compat_uptr_t data;
708};
709
710static inline void compat_nfs_string(struct nfs_string *dst,
711                     struct compat_nfs_string *src)
712{
713    dst->data = compat_ptr(src->data);
714    dst->len = src->len;
715}
716
717struct compat_nfs4_mount_data_v1 {
718    compat_int_t version;
719    compat_int_t flags;
720    compat_int_t rsize;
721    compat_int_t wsize;
722    compat_int_t timeo;
723    compat_int_t retrans;
724    compat_int_t acregmin;
725    compat_int_t acregmax;
726    compat_int_t acdirmin;
727    compat_int_t acdirmax;
728    struct compat_nfs_string client_addr;
729    struct compat_nfs_string mnt_path;
730    struct compat_nfs_string hostname;
731    compat_uint_t host_addrlen;
732    compat_uptr_t host_addr;
733    compat_int_t proto;
734    compat_int_t auth_flavourlen;
735    compat_uptr_t auth_flavours;
736};
737
738static int do_nfs4_super_data_conv(void *raw_data)
739{
740    int version = *(compat_uint_t *) raw_data;
741
742    if (version == 1) {
743        struct compat_nfs4_mount_data_v1 *raw = raw_data;
744        struct nfs4_mount_data *real = raw_data;
745
746        /* copy the fields backwards */
747        real->auth_flavours = compat_ptr(raw->auth_flavours);
748        real->auth_flavourlen = raw->auth_flavourlen;
749        real->proto = raw->proto;
750        real->host_addr = compat_ptr(raw->host_addr);
751        real->host_addrlen = raw->host_addrlen;
752        compat_nfs_string(&real->hostname, &raw->hostname);
753        compat_nfs_string(&real->mnt_path, &raw->mnt_path);
754        compat_nfs_string(&real->client_addr, &raw->client_addr);
755        real->acdirmax = raw->acdirmax;
756        real->acdirmin = raw->acdirmin;
757        real->acregmax = raw->acregmax;
758        real->acregmin = raw->acregmin;
759        real->retrans = raw->retrans;
760        real->timeo = raw->timeo;
761        real->wsize = raw->wsize;
762        real->rsize = raw->rsize;
763        real->flags = raw->flags;
764        real->version = raw->version;
765    }
766
767    return 0;
768}
769
770#define SMBFS_NAME "smbfs"
771#define NCPFS_NAME "ncpfs"
772#define NFS4_NAME "nfs4"
773
774asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
775                 char __user * type, unsigned long flags,
776                 void __user * data)
777{
778    unsigned long type_page;
779    unsigned long data_page;
780    unsigned long dev_page;
781    char *dir_page;
782    int retval;
783
784    retval = copy_mount_options (type, &type_page);
785    if (retval < 0)
786        goto out;
787
788    dir_page = getname(dir_name);
789    retval = PTR_ERR(dir_page);
790    if (IS_ERR(dir_page))
791        goto out1;
792
793    retval = copy_mount_options (dev_name, &dev_page);
794    if (retval < 0)
795        goto out2;
796
797    retval = copy_mount_options (data, &data_page);
798    if (retval < 0)
799        goto out3;
800
801    retval = -EINVAL;
802
803    if (type_page && data_page) {
804        if (!strcmp((char *)type_page, SMBFS_NAME)) {
805            do_smb_super_data_conv((void *)data_page);
806        } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
807            do_ncp_super_data_conv((void *)data_page);
808        } else if (!strcmp((char *)type_page, NFS4_NAME)) {
809            if (do_nfs4_super_data_conv((void *) data_page))
810                goto out4;
811        }
812    }
813
814    retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
815            flags, (void*)data_page);
816
817 out4:
818    free_page(data_page);
819 out3:
820    free_page(dev_page);
821 out2:
822    putname(dir_page);
823 out1:
824    free_page(type_page);
825 out:
826    return retval;
827}
828
829#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
830
831struct compat_old_linux_dirent {
832    compat_ulong_t d_ino;
833    compat_ulong_t d_offset;
834    unsigned short d_namlen;
835    char d_name[1];
836};
837
838struct compat_readdir_callback {
839    struct compat_old_linux_dirent __user *dirent;
840    int result;
841};
842
843static int compat_fillonedir(void *__buf, const char *name, int namlen,
844            loff_t offset, u64 ino, unsigned int d_type)
845{
846    struct compat_readdir_callback *buf = __buf;
847    struct compat_old_linux_dirent __user *dirent;
848    compat_ulong_t d_ino;
849
850    if (buf->result)
851        return -EINVAL;
852    d_ino = ino;
853    if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
854        buf->result = -EOVERFLOW;
855        return -EOVERFLOW;
856    }
857    buf->result++;
858    dirent = buf->dirent;
859    if (!access_ok(VERIFY_WRITE, dirent,
860            (unsigned long)(dirent->d_name + namlen + 1) -
861                (unsigned long)dirent))
862        goto efault;
863    if ( __put_user(d_ino, &dirent->d_ino) ||
864        __put_user(offset, &dirent->d_offset) ||
865        __put_user(namlen, &dirent->d_namlen) ||
866        __copy_to_user(dirent->d_name, name, namlen) ||
867        __put_user(0, dirent->d_name + namlen))
868        goto efault;
869    return 0;
870efault:
871    buf->result = -EFAULT;
872    return -EFAULT;
873}
874
875asmlinkage long compat_sys_old_readdir(unsigned int fd,
876    struct compat_old_linux_dirent __user *dirent, unsigned int count)
877{
878    int error;
879    struct file *file;
880    struct compat_readdir_callback buf;
881
882    error = -EBADF;
883    file = fget(fd);
884    if (!file)
885        goto out;
886
887    buf.result = 0;
888    buf.dirent = dirent;
889
890    error = vfs_readdir(file, compat_fillonedir, &buf);
891    if (buf.result)
892        error = buf.result;
893
894    fput(file);
895out:
896    return error;
897}
898
899struct compat_linux_dirent {
900    compat_ulong_t d_ino;
901    compat_ulong_t d_off;
902    unsigned short d_reclen;
903    char d_name[1];
904};
905
906struct compat_getdents_callback {
907    struct compat_linux_dirent __user *current_dir;
908    struct compat_linux_dirent __user *previous;
909    int count;
910    int error;
911};
912
913static int compat_filldir(void *__buf, const char *name, int namlen,
914        loff_t offset, u64 ino, unsigned int d_type)
915{
916    struct compat_linux_dirent __user * dirent;
917    struct compat_getdents_callback *buf = __buf;
918    compat_ulong_t d_ino;
919    int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
920
921    buf->error = -EINVAL; /* only used if we fail.. */
922    if (reclen > buf->count)
923        return -EINVAL;
924    d_ino = ino;
925    if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
926        buf->error = -EOVERFLOW;
927        return -EOVERFLOW;
928    }
929    dirent = buf->previous;
930    if (dirent) {
931        if (__put_user(offset, &dirent->d_off))
932            goto efault;
933    }
934    dirent = buf->current_dir;
935    if (__put_user(d_ino, &dirent->d_ino))
936        goto efault;
937    if (__put_user(reclen, &dirent->d_reclen))
938        goto efault;
939    if (copy_to_user(dirent->d_name, name, namlen))
940        goto efault;
941    if (__put_user(0, dirent->d_name + namlen))
942        goto efault;
943    if (__put_user(d_type, (char __user *) dirent + reclen - 1))
944        goto efault;
945    buf->previous = dirent;
946    dirent = (void __user *)dirent + reclen;
947    buf->current_dir = dirent;
948    buf->count -= reclen;
949    return 0;
950efault:
951    buf->error = -EFAULT;
952    return -EFAULT;
953}
954
955asmlinkage long compat_sys_getdents(unsigned int fd,
956        struct compat_linux_dirent __user *dirent, unsigned int count)
957{
958    struct file * file;
959    struct compat_linux_dirent __user * lastdirent;
960    struct compat_getdents_callback buf;
961    int error;
962
963    error = -EFAULT;
964    if (!access_ok(VERIFY_WRITE, dirent, count))
965        goto out;
966
967    error = -EBADF;
968    file = fget(fd);
969    if (!file)
970        goto out;
971
972    buf.current_dir = dirent;
973    buf.previous = NULL;
974    buf.count = count;
975    buf.error = 0;
976
977    error = vfs_readdir(file, compat_filldir, &buf);
978    if (error >= 0)
979        error = buf.error;
980    lastdirent = buf.previous;
981    if (lastdirent) {
982        if (put_user(file->f_pos, &lastdirent->d_off))
983            error = -EFAULT;
984        else
985            error = count - buf.count;
986    }
987    fput(file);
988out:
989    return error;
990}
991
992#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
993
994struct compat_getdents_callback64 {
995    struct linux_dirent64 __user *current_dir;
996    struct linux_dirent64 __user *previous;
997    int count;
998    int error;
999};
1000
1001static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1002             u64 ino, unsigned int d_type)
1003{
1004    struct linux_dirent64 __user *dirent;
1005    struct compat_getdents_callback64 *buf = __buf;
1006    int jj = NAME_OFFSET(dirent);
1007    int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1008    u64 off;
1009
1010    buf->error = -EINVAL; /* only used if we fail.. */
1011    if (reclen > buf->count)
1012        return -EINVAL;
1013    dirent = buf->previous;
1014
1015    if (dirent) {
1016        if (__put_user_unaligned(offset, &dirent->d_off))
1017            goto efault;
1018    }
1019    dirent = buf->current_dir;
1020    if (__put_user_unaligned(ino, &dirent->d_ino))
1021        goto efault;
1022    off = 0;
1023    if (__put_user_unaligned(off, &dirent->d_off))
1024        goto efault;
1025    if (__put_user(reclen, &dirent->d_reclen))
1026        goto efault;
1027    if (__put_user(d_type, &dirent->d_type))
1028        goto efault;
1029    if (copy_to_user(dirent->d_name, name, namlen))
1030        goto efault;
1031    if (__put_user(0, dirent->d_name + namlen))
1032        goto efault;
1033    buf->previous = dirent;
1034    dirent = (void __user *)dirent + reclen;
1035    buf->current_dir = dirent;
1036    buf->count -= reclen;
1037    return 0;
1038efault:
1039    buf->error = -EFAULT;
1040    return -EFAULT;
1041}
1042
1043asmlinkage long compat_sys_getdents64(unsigned int fd,
1044        struct linux_dirent64 __user * dirent, unsigned int count)
1045{
1046    struct file * file;
1047    struct linux_dirent64 __user * lastdirent;
1048    struct compat_getdents_callback64 buf;
1049    int error;
1050
1051    error = -EFAULT;
1052    if (!access_ok(VERIFY_WRITE, dirent, count))
1053        goto out;
1054
1055    error = -EBADF;
1056    file = fget(fd);
1057    if (!file)
1058        goto out;
1059
1060    buf.current_dir = dirent;
1061    buf.previous = NULL;
1062    buf.count = count;
1063    buf.error = 0;
1064
1065    error = vfs_readdir(file, compat_filldir64, &buf);
1066    if (error >= 0)
1067        error = buf.error;
1068    lastdirent = buf.previous;
1069    if (lastdirent) {
1070        typeof(lastdirent->d_off) d_off = file->f_pos;
1071        if (__put_user_unaligned(d_off, &lastdirent->d_off))
1072            error = -EFAULT;
1073        else
1074            error = count - buf.count;
1075    }
1076    fput(file);
1077out:
1078    return error;
1079}
1080#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1081
1082static ssize_t compat_do_readv_writev(int type, struct file *file,
1083                   const struct compat_iovec __user *uvector,
1084                   unsigned long nr_segs, loff_t *pos)
1085{
1086    compat_ssize_t tot_len;
1087    struct iovec iovstack[UIO_FASTIOV];
1088    struct iovec *iov=iovstack, *vector;
1089    ssize_t ret;
1090    int seg;
1091    io_fn_t fn;
1092    iov_fn_t fnv;
1093
1094    /*
1095     * SuS says "The readv() function *may* fail if the iovcnt argument
1096     * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1097     * traditionally returned zero for zero segments, so...
1098     */
1099    ret = 0;
1100    if (nr_segs == 0)
1101        goto out;
1102
1103    /*
1104     * First get the "struct iovec" from user memory and
1105     * verify all the pointers
1106     */
1107    ret = -EINVAL;
1108    if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1109        goto out;
1110    if (!file->f_op)
1111        goto out;
1112    if (nr_segs > UIO_FASTIOV) {
1113        ret = -ENOMEM;
1114        iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1115        if (!iov)
1116            goto out;
1117    }
1118    ret = -EFAULT;
1119    if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1120        goto out;
1121
1122    /*
1123     * Single unix specification:
1124     * We should -EINVAL if an element length is not >= 0 and fitting an
1125     * ssize_t. The total length is fitting an ssize_t
1126     *
1127     * Be careful here because iov_len is a size_t not an ssize_t
1128     */
1129    tot_len = 0;
1130    vector = iov;
1131    ret = -EINVAL;
1132    for (seg = 0 ; seg < nr_segs; seg++) {
1133        compat_ssize_t tmp = tot_len;
1134        compat_ssize_t len;
1135        compat_uptr_t buf;
1136
1137        if (__get_user(len, &uvector->iov_len) ||
1138            __get_user(buf, &uvector->iov_base)) {
1139            ret = -EFAULT;
1140            goto out;
1141        }
1142        if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1143            goto out;
1144        tot_len += len;
1145        if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1146            goto out;
1147        vector->iov_base = compat_ptr(buf);
1148        vector->iov_len = (compat_size_t) len;
1149        uvector++;
1150        vector++;
1151    }
1152    if (tot_len == 0) {
1153        ret = 0;
1154        goto out;
1155    }
1156
1157    ret = rw_verify_area(type, file, pos, tot_len);
1158    if (ret < 0)
1159        goto out;
1160
1161    fnv = NULL;
1162    if (type == READ) {
1163        fn = file->f_op->read;
1164        fnv = file->f_op->aio_read;
1165    } else {
1166        fn = (io_fn_t)file->f_op->write;
1167        fnv = file->f_op->aio_write;
1168    }
1169
1170    if (fnv)
1171        ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1172                        pos, fnv);
1173    else
1174        ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1175
1176out:
1177    if (iov != iovstack)
1178        kfree(iov);
1179    if ((ret + (type == READ)) > 0) {
1180        struct dentry *dentry = file->f_path.dentry;
1181        if (type == READ)
1182            fsnotify_access(dentry);
1183        else
1184            fsnotify_modify(dentry);
1185    }
1186    return ret;
1187}
1188
1189static size_t compat_readv(struct file *file,
1190               const struct compat_iovec __user *vec,
1191               unsigned long vlen, loff_t *pos)
1192{
1193    ssize_t ret = -EBADF;
1194
1195    if (!(file->f_mode & FMODE_READ))
1196        goto out;
1197
1198    ret = -EINVAL;
1199    if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1200        goto out;
1201
1202    ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1203
1204out:
1205    if (ret > 0)
1206        add_rchar(current, ret);
1207    inc_syscr(current);
1208    return ret;
1209}
1210
1211asmlinkage ssize_t
1212compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1213         unsigned long vlen)
1214{
1215    struct file *file;
1216    int fput_needed;
1217    ssize_t ret;
1218
1219    file = fget_light(fd, &fput_needed);
1220    if (!file)
1221        return -EBADF;
1222    ret = compat_readv(file, vec, vlen, &file->f_pos);
1223    fput_light(file, fput_needed);
1224    return ret;
1225}
1226
1227asmlinkage ssize_t
1228compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1229          unsigned long vlen, u32 pos_low, u32 pos_high)
1230{
1231    loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1232    struct file *file;
1233    int fput_needed;
1234    ssize_t ret;
1235
1236    if (pos < 0)
1237        return -EINVAL;
1238    file = fget_light(fd, &fput_needed);
1239    if (!file)
1240        return -EBADF;
1241    ret = compat_readv(file, vec, vlen, &pos);
1242    fput_light(file, fput_needed);
1243    return ret;
1244}
1245
1246static size_t compat_writev(struct file *file,
1247                const struct compat_iovec __user *vec,
1248                unsigned long vlen, loff_t *pos)
1249{
1250    ssize_t ret = -EBADF;
1251
1252    if (!(file->f_mode & FMODE_WRITE))
1253        goto out;
1254
1255    ret = -EINVAL;
1256    if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1257        goto out;
1258
1259    ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1260
1261out:
1262    if (ret > 0)
1263        add_wchar(current, ret);
1264    inc_syscw(current);
1265    return ret;
1266}
1267
1268asmlinkage ssize_t
1269compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1270          unsigned long vlen)
1271{
1272    struct file *file;
1273    int fput_needed;
1274    ssize_t ret;
1275
1276    file = fget_light(fd, &fput_needed);
1277    if (!file)
1278        return -EBADF;
1279    ret = compat_writev(file, vec, vlen, &file->f_pos);
1280    fput_light(file, fput_needed);
1281    return ret;
1282}
1283
1284asmlinkage ssize_t
1285compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1286           unsigned long vlen, u32 pos_low, u32 pos_high)
1287{
1288    loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1289    struct file *file;
1290    int fput_needed;
1291    ssize_t ret;
1292
1293    if (pos < 0)
1294        return -EINVAL;
1295    file = fget_light(fd, &fput_needed);
1296    if (!file)
1297        return -EBADF;
1298    ret = compat_writev(file, vec, vlen, &pos);
1299    fput_light(file, fput_needed);
1300    return ret;
1301}
1302
1303asmlinkage long
1304compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1305            unsigned int nr_segs, unsigned int flags)
1306{
1307    unsigned i;
1308    struct iovec __user *iov;
1309    if (nr_segs > UIO_MAXIOV)
1310        return -EINVAL;
1311    iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1312    for (i = 0; i < nr_segs; i++) {
1313        struct compat_iovec v;
1314        if (get_user(v.iov_base, &iov32[i].iov_base) ||
1315            get_user(v.iov_len, &iov32[i].iov_len) ||
1316            put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1317            put_user(v.iov_len, &iov[i].iov_len))
1318            return -EFAULT;
1319    }
1320    return sys_vmsplice(fd, iov, nr_segs, flags);
1321}
1322
1323/*
1324 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1325 * O_LARGEFILE flag.
1326 */
1327asmlinkage long
1328compat_sys_open(const char __user *filename, int flags, int mode)
1329{
1330    return do_sys_open(AT_FDCWD, filename, flags, mode);
1331}
1332
1333/*
1334 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1335 * O_LARGEFILE flag.
1336 */
1337asmlinkage long
1338compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1339{
1340    return do_sys_open(dfd, filename, flags, mode);
1341}
1342
1343/*
1344 * compat_count() counts the number of arguments/envelopes. It is basically
1345 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1346 * and envp pointers.
1347 */
1348static int compat_count(compat_uptr_t __user *argv, int max)
1349{
1350    int i = 0;
1351
1352    if (argv != NULL) {
1353        for (;;) {
1354            compat_uptr_t p;
1355
1356            if (get_user(p, argv))
1357                return -EFAULT;
1358            if (!p)
1359                break;
1360            argv++;
1361            if (i++ >= max)
1362                return -E2BIG;
1363        }
1364    }
1365    return i;
1366}
1367
1368/*
1369 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1370 * except that it works with 32 bit argv and envp pointers.
1371 */
1372static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1373                struct linux_binprm *bprm)
1374{
1375    struct page *kmapped_page = NULL;
1376    char *kaddr = NULL;
1377    unsigned long kpos = 0;
1378    int ret;
1379
1380    while (argc-- > 0) {
1381        compat_uptr_t str;
1382        int len;
1383        unsigned long pos;
1384
1385        if (get_user(str, argv+argc) ||
1386            !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1387            ret = -EFAULT;
1388            goto out;
1389        }
1390
1391        if (len > MAX_ARG_STRLEN) {
1392            ret = -E2BIG;
1393            goto out;
1394        }
1395
1396        /* We're going to work our way backwords. */
1397        pos = bprm->p;
1398        str += len;
1399        bprm->p -= len;
1400
1401        while (len > 0) {
1402            int offset, bytes_to_copy;
1403
1404            offset = pos % PAGE_SIZE;
1405            if (offset == 0)
1406                offset = PAGE_SIZE;
1407
1408            bytes_to_copy = offset;
1409            if (bytes_to_copy > len)
1410                bytes_to_copy = len;
1411
1412            offset -= bytes_to_copy;
1413            pos -= bytes_to_copy;
1414            str -= bytes_to_copy;
1415            len -= bytes_to_copy;
1416
1417            if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1418                struct page *page;
1419
1420#ifdef CONFIG_STACK_GROWSUP
1421                ret = expand_stack_downwards(bprm->vma, pos);
1422                if (ret < 0) {
1423                    /* We've exceed the stack rlimit. */
1424                    ret = -E2BIG;
1425                    goto out;
1426                }
1427#endif
1428                ret = get_user_pages(current, bprm->mm, pos,
1429                             1, 1, 1, &page, NULL);
1430                if (ret <= 0) {
1431                    /* We've exceed the stack rlimit. */
1432                    ret = -E2BIG;
1433                    goto out;
1434                }
1435
1436                if (kmapped_page) {
1437                    flush_kernel_dcache_page(kmapped_page);
1438                    kunmap(kmapped_page);
1439                    put_page(kmapped_page);
1440                }
1441                kmapped_page = page;
1442                kaddr = kmap(kmapped_page);
1443                kpos = pos & PAGE_MASK;
1444                flush_cache_page(bprm->vma, kpos,
1445                         page_to_pfn(kmapped_page));
1446            }
1447            if (copy_from_user(kaddr+offset, compat_ptr(str),
1448                        bytes_to_copy)) {
1449                ret = -EFAULT;
1450                goto out;
1451            }
1452        }
1453    }
1454    ret = 0;
1455out:
1456    if (kmapped_page) {
1457        flush_kernel_dcache_page(kmapped_page);
1458        kunmap(kmapped_page);
1459        put_page(kmapped_page);
1460    }
1461    return ret;
1462}
1463
1464/*
1465 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1466 * that it processes 32 bit argv and envp pointers.
1467 */
1468int compat_do_execve(char * filename,
1469    compat_uptr_t __user *argv,
1470    compat_uptr_t __user *envp,
1471    struct pt_regs * regs)
1472{
1473    struct linux_binprm *bprm;
1474    struct file *file;
1475    struct files_struct *displaced;
1476    bool clear_in_exec;
1477    int retval;
1478
1479    retval = unshare_files(&displaced);
1480    if (retval)
1481        goto out_ret;
1482
1483    retval = -ENOMEM;
1484    bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1485    if (!bprm)
1486        goto out_files;
1487
1488    retval = prepare_bprm_creds(bprm);
1489    if (retval)
1490        goto out_free;
1491
1492    retval = check_unsafe_exec(bprm);
1493    if (retval < 0)
1494        goto out_free;
1495    clear_in_exec = retval;
1496    current->in_execve = 1;
1497
1498    file = open_exec(filename);
1499    retval = PTR_ERR(file);
1500    if (IS_ERR(file))
1501        goto out_unmark;
1502
1503    sched_exec();
1504
1505    bprm->file = file;
1506    bprm->filename = filename;
1507    bprm->interp = filename;
1508
1509    retval = bprm_mm_init(bprm);
1510    if (retval)
1511        goto out_file;
1512
1513    bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1514    if ((retval = bprm->argc) < 0)
1515        goto out;
1516
1517    bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1518    if ((retval = bprm->envc) < 0)
1519        goto out;
1520
1521    retval = prepare_binprm(bprm);
1522    if (retval < 0)
1523        goto out;
1524
1525    retval = copy_strings_kernel(1, &bprm->filename, bprm);
1526    if (retval < 0)
1527        goto out;
1528
1529    bprm->exec = bprm->p;
1530    retval = compat_copy_strings(bprm->envc, envp, bprm);
1531    if (retval < 0)
1532        goto out;
1533
1534    retval = compat_copy_strings(bprm->argc, argv, bprm);
1535    if (retval < 0)
1536        goto out;
1537
1538    retval = search_binary_handler(bprm, regs);
1539    if (retval < 0)
1540        goto out;
1541
1542    /* execve succeeded */
1543    current->fs->in_exec = 0;
1544    current->in_execve = 0;
1545    acct_update_integrals(current);
1546    free_bprm(bprm);
1547    if (displaced)
1548        put_files_struct(displaced);
1549    return retval;
1550
1551out:
1552    if (bprm->mm)
1553        mmput(bprm->mm);
1554
1555out_file:
1556    if (bprm->file) {
1557        allow_write_access(bprm->file);
1558        fput(bprm->file);
1559    }
1560
1561out_unmark:
1562    if (clear_in_exec)
1563        current->fs->in_exec = 0;
1564    current->in_execve = 0;
1565
1566out_free:
1567    free_bprm(bprm);
1568
1569out_files:
1570    if (displaced)
1571        reset_files_struct(displaced);
1572out_ret:
1573    return retval;
1574}
1575
1576#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1577
1578static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1579                      int timeval, int ret)
1580{
1581    struct timespec ts;
1582
1583    if (!p)
1584        return ret;
1585
1586    if (current->personality & STICKY_TIMEOUTS)
1587        goto sticky;
1588
1589    /* No update for zero timeout */
1590    if (!end_time->tv_sec && !end_time->tv_nsec)
1591        return ret;
1592
1593    ktime_get_ts(&ts);
1594    ts = timespec_sub(*end_time, ts);
1595    if (ts.tv_sec < 0)
1596        ts.tv_sec = ts.tv_nsec = 0;
1597
1598    if (timeval) {
1599        struct compat_timeval rtv;
1600
1601        rtv.tv_sec = ts.tv_sec;
1602        rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1603
1604        if (!copy_to_user(p, &rtv, sizeof(rtv)))
1605            return ret;
1606    } else {
1607        struct compat_timespec rts;
1608
1609        rts.tv_sec = ts.tv_sec;
1610        rts.tv_nsec = ts.tv_nsec;
1611
1612        if (!copy_to_user(p, &rts, sizeof(rts)))
1613            return ret;
1614    }
1615    /*
1616     * If an application puts its timeval in read-only memory, we
1617     * don't want the Linux-specific update to the timeval to
1618     * cause a fault after the select has completed
1619     * successfully. However, because we're not updating the
1620     * timeval, we can't restart the system call.
1621     */
1622
1623sticky:
1624    if (ret == -ERESTARTNOHAND)
1625        ret = -EINTR;
1626    return ret;
1627}
1628
1629/*
1630 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1631 * 64-bit unsigned longs.
1632 */
1633static
1634int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1635            unsigned long *fdset)
1636{
1637    nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1638    if (ufdset) {
1639        unsigned long odd;
1640
1641        if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1642            return -EFAULT;
1643
1644        odd = nr & 1UL;
1645        nr &= ~1UL;
1646        while (nr) {
1647            unsigned long h, l;
1648            if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1649                return -EFAULT;
1650            ufdset += 2;
1651            *fdset++ = h << 32 | l;
1652            nr -= 2;
1653        }
1654        if (odd && __get_user(*fdset, ufdset))
1655            return -EFAULT;
1656    } else {
1657        /* Tricky, must clear full unsigned long in the
1658         * kernel fdset at the end, this makes sure that
1659         * actually happens.
1660         */
1661        memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1662    }
1663    return 0;
1664}
1665
1666static
1667int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1668              unsigned long *fdset)
1669{
1670    unsigned long odd;
1671    nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1672
1673    if (!ufdset)
1674        return 0;
1675
1676    odd = nr & 1UL;
1677    nr &= ~1UL;
1678    while (nr) {
1679        unsigned long h, l;
1680        l = *fdset++;
1681        h = l >> 32;
1682        if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1683            return -EFAULT;
1684        ufdset += 2;
1685        nr -= 2;
1686    }
1687    if (odd && __put_user(*fdset, ufdset))
1688        return -EFAULT;
1689    return 0;
1690}
1691
1692
1693/*
1694 * This is a virtual copy of sys_select from fs/select.c and probably
1695 * should be compared to it from time to time
1696 */
1697
1698/*
1699 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1700 * like to be certain this leads to no problems. So I return
1701 * EINTR just for safety.
1702 *
1703 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1704 * I'm trying ERESTARTNOHAND which restart only when you want to.
1705 */
1706#define MAX_SELECT_SECONDS \
1707    ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1708
1709int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1710    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1711    struct timespec *end_time)
1712{
1713    fd_set_bits fds;
1714    void *bits;
1715    int size, max_fds, ret = -EINVAL;
1716    struct fdtable *fdt;
1717    long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1718
1719    if (n < 0)
1720        goto out_nofds;
1721
1722    /* max_fds can increase, so grab it once to avoid race */
1723    rcu_read_lock();
1724    fdt = files_fdtable(current->files);
1725    max_fds = fdt->max_fds;
1726    rcu_read_unlock();
1727    if (n > max_fds)
1728        n = max_fds;
1729
1730    /*
1731     * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1732     * since we used fdset we need to allocate memory in units of
1733     * long-words.
1734     */
1735    size = FDS_BYTES(n);
1736    bits = stack_fds;
1737    if (size > sizeof(stack_fds) / 6) {
1738        bits = kmalloc(6 * size, GFP_KERNEL);
1739        ret = -ENOMEM;
1740        if (!bits)
1741            goto out_nofds;
1742    }
1743    fds.in = (unsigned long *) bits;
1744    fds.out = (unsigned long *) (bits + size);
1745    fds.ex = (unsigned long *) (bits + 2*size);
1746    fds.res_in = (unsigned long *) (bits + 3*size);
1747    fds.res_out = (unsigned long *) (bits + 4*size);
1748    fds.res_ex = (unsigned long *) (bits + 5*size);
1749
1750    if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1751        (ret = compat_get_fd_set(n, outp, fds.out)) ||
1752        (ret = compat_get_fd_set(n, exp, fds.ex)))
1753        goto out;
1754    zero_fd_set(n, fds.res_in);
1755    zero_fd_set(n, fds.res_out);
1756    zero_fd_set(n, fds.res_ex);
1757
1758    ret = do_select(n, &fds, end_time);
1759
1760    if (ret < 0)
1761        goto out;
1762    if (!ret) {
1763        ret = -ERESTARTNOHAND;
1764        if (signal_pending(current))
1765            goto out;
1766        ret = 0;
1767    }
1768
1769    if (compat_set_fd_set(n, inp, fds.res_in) ||
1770        compat_set_fd_set(n, outp, fds.res_out) ||
1771        compat_set_fd_set(n, exp, fds.res_ex))
1772        ret = -EFAULT;
1773out:
1774    if (bits != stack_fds)
1775        kfree(bits);
1776out_nofds:
1777    return ret;
1778}
1779
1780asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1781    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1782    struct compat_timeval __user *tvp)
1783{
1784    struct timespec end_time, *to = NULL;
1785    struct compat_timeval tv;
1786    int ret;
1787
1788    if (tvp) {
1789        if (copy_from_user(&tv, tvp, sizeof(tv)))
1790            return -EFAULT;
1791
1792        to = &end_time;
1793        if (poll_select_set_timeout(to,
1794                tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1795                (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1796            return -EINVAL;
1797    }
1798
1799    ret = compat_core_sys_select(n, inp, outp, exp, to);
1800    ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1801
1802    return ret;
1803}
1804
1805#ifdef HAVE_SET_RESTORE_SIGMASK
1806static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1807    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1808    struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1809    compat_size_t sigsetsize)
1810{
1811    compat_sigset_t ss32;
1812    sigset_t ksigmask, sigsaved;
1813    struct compat_timespec ts;
1814    struct timespec end_time, *to = NULL;
1815    int ret;
1816
1817    if (tsp) {
1818        if (copy_from_user(&ts, tsp, sizeof(ts)))
1819            return -EFAULT;
1820
1821        to = &end_time;
1822        if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1823            return -EINVAL;
1824    }
1825
1826    if (sigmask) {
1827        if (sigsetsize != sizeof(compat_sigset_t))
1828            return -EINVAL;
1829        if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1830            return -EFAULT;
1831        sigset_from_compat(&ksigmask, &ss32);
1832
1833        sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1834        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1835    }
1836
1837    ret = compat_core_sys_select(n, inp, outp, exp, to);
1838    ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1839
1840    if (ret == -ERESTARTNOHAND) {
1841        /*
1842         * Don't restore the signal mask yet. Let do_signal() deliver
1843         * the signal on the way back to userspace, before the signal
1844         * mask is restored.
1845         */
1846        if (sigmask) {
1847            memcpy(&current->saved_sigmask, &sigsaved,
1848                    sizeof(sigsaved));
1849            set_restore_sigmask();
1850        }
1851    } else if (sigmask)
1852        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1853
1854    return ret;
1855}
1856
1857asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1858    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1859    struct compat_timespec __user *tsp, void __user *sig)
1860{
1861    compat_size_t sigsetsize = 0;
1862    compat_uptr_t up = 0;
1863
1864    if (sig) {
1865        if (!access_ok(VERIFY_READ, sig,
1866                sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1867                __get_user(up, (compat_uptr_t __user *)sig) ||
1868                __get_user(sigsetsize,
1869                (compat_size_t __user *)(sig+sizeof(up))))
1870            return -EFAULT;
1871    }
1872    return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1873                 sigsetsize);
1874}
1875
1876asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1877    unsigned int nfds, struct compat_timespec __user *tsp,
1878    const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1879{
1880    compat_sigset_t ss32;
1881    sigset_t ksigmask, sigsaved;
1882    struct compat_timespec ts;
1883    struct timespec end_time, *to = NULL;
1884    int ret;
1885
1886    if (tsp) {
1887        if (copy_from_user(&ts, tsp, sizeof(ts)))
1888            return -EFAULT;
1889
1890        to = &end_time;
1891        if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1892            return -EINVAL;
1893    }
1894
1895    if (sigmask) {
1896        if (sigsetsize != sizeof(compat_sigset_t))
1897            return -EINVAL;
1898        if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1899            return -EFAULT;
1900        sigset_from_compat(&ksigmask, &ss32);
1901
1902        sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1903        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1904    }
1905
1906    ret = do_sys_poll(ufds, nfds, to);
1907
1908    /* We can restart this syscall, usually */
1909    if (ret == -EINTR) {
1910        /*
1911         * Don't restore the signal mask yet. Let do_signal() deliver
1912         * the signal on the way back to userspace, before the signal
1913         * mask is restored.
1914         */
1915        if (sigmask) {
1916            memcpy(&current->saved_sigmask, &sigsaved,
1917                sizeof(sigsaved));
1918            set_restore_sigmask();
1919        }
1920        ret = -ERESTARTNOHAND;
1921    } else if (sigmask)
1922        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1923
1924    ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1925
1926    return ret;
1927}
1928#endif /* HAVE_SET_RESTORE_SIGMASK */
1929
1930#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1931/* Stuff for NFS server syscalls... */
1932struct compat_nfsctl_svc {
1933    u16 svc32_port;
1934    s32 svc32_nthreads;
1935};
1936
1937struct compat_nfsctl_client {
1938    s8 cl32_ident[NFSCLNT_IDMAX+1];
1939    s32 cl32_naddr;
1940    struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1941    s32 cl32_fhkeytype;
1942    s32 cl32_fhkeylen;
1943    u8 cl32_fhkey[NFSCLNT_KEYMAX];
1944};
1945
1946struct compat_nfsctl_export {
1947    char ex32_client[NFSCLNT_IDMAX+1];
1948    char ex32_path[NFS_MAXPATHLEN+1];
1949    compat_dev_t ex32_dev;
1950    compat_ino_t ex32_ino;
1951    compat_int_t ex32_flags;
1952    __compat_uid_t ex32_anon_uid;
1953    __compat_gid_t ex32_anon_gid;
1954};
1955
1956struct compat_nfsctl_fdparm {
1957    struct sockaddr gd32_addr;
1958    s8 gd32_path[NFS_MAXPATHLEN+1];
1959    compat_int_t gd32_version;
1960};
1961
1962struct compat_nfsctl_fsparm {
1963    struct sockaddr gd32_addr;
1964    s8 gd32_path[NFS_MAXPATHLEN+1];
1965    compat_int_t gd32_maxlen;
1966};
1967
1968struct compat_nfsctl_arg {
1969    compat_int_t ca32_version; /* safeguard */
1970    union {
1971        struct compat_nfsctl_svc u32_svc;
1972        struct compat_nfsctl_client u32_client;
1973        struct compat_nfsctl_export u32_export;
1974        struct compat_nfsctl_fdparm u32_getfd;
1975        struct compat_nfsctl_fsparm u32_getfs;
1976    } u;
1977#define ca32_svc u.u32_svc
1978#define ca32_client u.u32_client
1979#define ca32_export u.u32_export
1980#define ca32_getfd u.u32_getfd
1981#define ca32_getfs u.u32_getfs
1982};
1983
1984union compat_nfsctl_res {
1985    __u8 cr32_getfh[NFS_FHSIZE];
1986    struct knfsd_fh cr32_getfs;
1987};
1988
1989static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1990                struct compat_nfsctl_arg __user *arg)
1991{
1992    if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1993        get_user(karg->ca_version, &arg->ca32_version) ||
1994        __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1995        __get_user(karg->ca_svc.svc_nthreads,
1996                &arg->ca32_svc.svc32_nthreads))
1997        return -EFAULT;
1998    return 0;
1999}
2000
2001static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2002                struct compat_nfsctl_arg __user *arg)
2003{
2004    if (!access_ok(VERIFY_READ, &arg->ca32_client,
2005            sizeof(arg->ca32_client)) ||
2006        get_user(karg->ca_version, &arg->ca32_version) ||
2007        __copy_from_user(&karg->ca_client.cl_ident[0],
2008                &arg->ca32_client.cl32_ident[0],
2009                NFSCLNT_IDMAX) ||
2010        __get_user(karg->ca_client.cl_naddr,
2011                &arg->ca32_client.cl32_naddr) ||
2012        __copy_from_user(&karg->ca_client.cl_addrlist[0],
2013                &arg->ca32_client.cl32_addrlist[0],
2014                (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2015        __get_user(karg->ca_client.cl_fhkeytype,
2016                &arg->ca32_client.cl32_fhkeytype) ||
2017        __get_user(karg->ca_client.cl_fhkeylen,
2018                &arg->ca32_client.cl32_fhkeylen) ||
2019        __copy_from_user(&karg->ca_client.cl_fhkey[0],
2020                &arg->ca32_client.cl32_fhkey[0],
2021                NFSCLNT_KEYMAX))
2022        return -EFAULT;
2023
2024    return 0;
2025}
2026
2027static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2028                struct compat_nfsctl_arg __user *arg)
2029{
2030    if (!access_ok(VERIFY_READ, &arg->ca32_export,
2031                sizeof(arg->ca32_export)) ||
2032        get_user(karg->ca_version, &arg->ca32_version) ||
2033        __copy_from_user(&karg->ca_export.ex_client[0],
2034                &arg->ca32_export.ex32_client[0],
2035                NFSCLNT_IDMAX) ||
2036        __copy_from_user(&karg->ca_export.ex_path[0],
2037                &arg->ca32_export.ex32_path[0],
2038                NFS_MAXPATHLEN) ||
2039        __get_user(karg->ca_export.ex_dev,
2040                &arg->ca32_export.ex32_dev) ||
2041        __get_user(karg->ca_export.ex_ino,
2042                &arg->ca32_export.ex32_ino) ||
2043        __get_user(karg->ca_export.ex_flags,
2044                &arg->ca32_export.ex32_flags) ||
2045        __get_user(karg->ca_export.ex_anon_uid,
2046                &arg->ca32_export.ex32_anon_uid) ||
2047        __get_user(karg->ca_export.ex_anon_gid,
2048                &arg->ca32_export.ex32_anon_gid))
2049        return -EFAULT;
2050    SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2051    SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2052
2053    return 0;
2054}
2055
2056static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2057                struct compat_nfsctl_arg __user *arg)
2058{
2059    if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2060            sizeof(arg->ca32_getfd)) ||
2061        get_user(karg->ca_version, &arg->ca32_version) ||
2062        __copy_from_user(&karg->ca_getfd.gd_addr,
2063                &arg->ca32_getfd.gd32_addr,
2064                (sizeof(struct sockaddr))) ||
2065        __copy_from_user(&karg->ca_getfd.gd_path,
2066                &arg->ca32_getfd.gd32_path,
2067                (NFS_MAXPATHLEN+1)) ||
2068        __get_user(karg->ca_getfd.gd_version,
2069                &arg->ca32_getfd.gd32_version))
2070        return -EFAULT;
2071
2072    return 0;
2073}
2074
2075static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2076                struct compat_nfsctl_arg __user *arg)
2077{
2078    if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2079        get_user(karg->ca_version, &arg->ca32_version) ||
2080        __copy_from_user(&karg->ca_getfs.gd_addr,
2081                &arg->ca32_getfs.gd32_addr,
2082                (sizeof(struct sockaddr))) ||
2083        __copy_from_user(&karg->ca_getfs.gd_path,
2084                &arg->ca32_getfs.gd32_path,
2085                (NFS_MAXPATHLEN+1)) ||
2086        __get_user(karg->ca_getfs.gd_maxlen,
2087                &arg->ca32_getfs.gd32_maxlen))
2088        return -EFAULT;
2089
2090    return 0;
2091}
2092
2093/* This really doesn't need translations, we are only passing
2094 * back a union which contains opaque nfs file handle data.
2095 */
2096static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2097                union compat_nfsctl_res __user *res)
2098{
2099    int err;
2100
2101    err = copy_to_user(res, kres, sizeof(*res));
2102
2103    return (err) ? -EFAULT : 0;
2104}
2105
2106asmlinkage long compat_sys_nfsservctl(int cmd,
2107                struct compat_nfsctl_arg __user *arg,
2108                union compat_nfsctl_res __user *res)
2109{
2110    struct nfsctl_arg *karg;
2111    union nfsctl_res *kres;
2112    mm_segment_t oldfs;
2113    int err;
2114
2115    karg = kmalloc(sizeof(*karg), GFP_USER);
2116    kres = kmalloc(sizeof(*kres), GFP_USER);
2117    if(!karg || !kres) {
2118        err = -ENOMEM;
2119        goto done;
2120    }
2121
2122    switch(cmd) {
2123    case NFSCTL_SVC:
2124        err = compat_nfs_svc_trans(karg, arg);
2125        break;
2126
2127    case NFSCTL_ADDCLIENT:
2128        err = compat_nfs_clnt_trans(karg, arg);
2129        break;
2130
2131    case NFSCTL_DELCLIENT:
2132        err = compat_nfs_clnt_trans(karg, arg);
2133        break;
2134
2135    case NFSCTL_EXPORT:
2136    case NFSCTL_UNEXPORT:
2137        err = compat_nfs_exp_trans(karg, arg);
2138        break;
2139
2140    case NFSCTL_GETFD:
2141        err = compat_nfs_getfd_trans(karg, arg);
2142        break;
2143
2144    case NFSCTL_GETFS:
2145        err = compat_nfs_getfs_trans(karg, arg);
2146        break;
2147
2148    default:
2149        err = -EINVAL;
2150        break;
2151    }
2152
2153    if (err)
2154        goto done;
2155
2156    oldfs = get_fs();
2157    set_fs(KERNEL_DS);
2158    /* The __user pointer casts are valid because of the set_fs() */
2159    err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2160    set_fs(oldfs);
2161
2162    if (err)
2163        goto done;
2164
2165    if((cmd == NFSCTL_GETFD) ||
2166       (cmd == NFSCTL_GETFS))
2167        err = compat_nfs_getfh_res_trans(kres, res);
2168
2169done:
2170    kfree(karg);
2171    kfree(kres);
2172    return err;
2173}
2174#else /* !NFSD */
2175long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2176{
2177    return sys_ni_syscall();
2178}
2179#endif
2180
2181#ifdef CONFIG_EPOLL
2182
2183#ifdef HAVE_SET_RESTORE_SIGMASK
2184asmlinkage long compat_sys_epoll_pwait(int epfd,
2185            struct compat_epoll_event __user *events,
2186            int maxevents, int timeout,
2187            const compat_sigset_t __user *sigmask,
2188            compat_size_t sigsetsize)
2189{
2190    long err;
2191    compat_sigset_t csigmask;
2192    sigset_t ksigmask, sigsaved;
2193
2194    /*
2195     * If the caller wants a certain signal mask to be set during the wait,
2196     * we apply it here.
2197     */
2198    if (sigmask) {
2199        if (sigsetsize != sizeof(compat_sigset_t))
2200            return -EINVAL;
2201        if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2202            return -EFAULT;
2203        sigset_from_compat(&ksigmask, &csigmask);
2204        sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2205        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2206    }
2207
2208    err = sys_epoll_wait(epfd, events, maxevents, timeout);
2209
2210    /*
2211     * If we changed the signal mask, we need to restore the original one.
2212     * In case we've got a signal while waiting, we do not restore the
2213     * signal mask yet, and we allow do_signal() to deliver the signal on
2214     * the way back to userspace, before the signal mask is restored.
2215     */
2216    if (sigmask) {
2217        if (err == -EINTR) {
2218            memcpy(&current->saved_sigmask, &sigsaved,
2219                   sizeof(sigsaved));
2220            set_restore_sigmask();
2221        } else
2222            sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2223    }
2224
2225    return err;
2226}
2227#endif /* HAVE_SET_RESTORE_SIGMASK */
2228
2229#endif /* CONFIG_EPOLL */
2230
2231#ifdef CONFIG_SIGNALFD
2232
2233asmlinkage long compat_sys_signalfd4(int ufd,
2234                     const compat_sigset_t __user *sigmask,
2235                     compat_size_t sigsetsize, int flags)
2236{
2237    compat_sigset_t ss32;
2238    sigset_t tmp;
2239    sigset_t __user *ksigmask;
2240
2241    if (sigsetsize != sizeof(compat_sigset_t))
2242        return -EINVAL;
2243    if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2244        return -EFAULT;
2245    sigset_from_compat(&tmp, &ss32);
2246    ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2247    if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2248        return -EFAULT;
2249
2250    return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2251}
2252
2253asmlinkage long compat_sys_signalfd(int ufd,
2254                    const compat_sigset_t __user *sigmask,
2255                    compat_size_t sigsetsize)
2256{
2257    return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2258}
2259#endif /* CONFIG_SIGNALFD */
2260
2261#ifdef CONFIG_TIMERFD
2262
2263asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2264                   const struct compat_itimerspec __user *utmr,
2265                   struct compat_itimerspec __user *otmr)
2266{
2267    int error;
2268    struct itimerspec t;
2269    struct itimerspec __user *ut;
2270
2271    if (get_compat_itimerspec(&t, utmr))
2272        return -EFAULT;
2273    ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2274    if (copy_to_user(&ut[0], &t, sizeof(t)))
2275        return -EFAULT;
2276    error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2277    if (!error && otmr)
2278        error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2279             put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2280
2281    return error;
2282}
2283
2284asmlinkage long compat_sys_timerfd_gettime(int ufd,
2285                   struct compat_itimerspec __user *otmr)
2286{
2287    int error;
2288    struct itimerspec t;
2289    struct itimerspec __user *ut;
2290
2291    ut = compat_alloc_user_space(sizeof(struct itimerspec));
2292    error = sys_timerfd_gettime(ufd, ut);
2293    if (!error)
2294        error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2295             put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2296
2297    return error;
2298}
2299
2300#endif /* CONFIG_TIMERFD */
2301

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