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/nfsd/syscall.h>
42#include <linux/personality.h>
43#include <linux/rwsem.h>
44#include <linux/tsacct_kern.h>
45#include <linux/security.h>
46#include <linux/highmem.h>
47#include <linux/signal.h>
48#include <linux/poll.h>
49#include <linux/mm.h>
50#include <linux/eventpoll.h>
51#include <linux/fs_struct.h>
52#include <linux/slab.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(char __user *filename, struct compat_utimbuf __user *t)
80{
81    struct timespec tv[2];
82
83    if (t) {
84        if (get_user(tv[0].tv_sec, &t->actime) ||
85            get_user(tv[1].tv_sec, &t->modtime))
86            return -EFAULT;
87        tv[0].tv_nsec = 0;
88        tv[1].tv_nsec = 0;
89    }
90    return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
91}
92
93asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
94{
95    struct timespec tv[2];
96
97    if (t) {
98        if (get_compat_timespec(&tv[0], &t[0]) ||
99            get_compat_timespec(&tv[1], &t[1]))
100            return -EFAULT;
101
102        if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
103            return 0;
104    }
105    return do_utimes(dfd, filename, t ? tv : NULL, flags);
106}
107
108asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
109{
110    struct timespec tv[2];
111
112    if (t) {
113        if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
114            get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
115            get_user(tv[1].tv_sec, &t[1].tv_sec) ||
116            get_user(tv[1].tv_nsec, &t[1].tv_usec))
117            return -EFAULT;
118        if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
119            tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
120            return -EINVAL;
121        tv[0].tv_nsec *= 1000;
122        tv[1].tv_nsec *= 1000;
123    }
124    return do_utimes(dfd, filename, t ? tv : NULL, 0);
125}
126
127asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
128{
129    return compat_sys_futimesat(AT_FDCWD, filename, t);
130}
131
132static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
133{
134    compat_ino_t ino = stat->ino;
135    typeof(ubuf->st_uid) uid = 0;
136    typeof(ubuf->st_gid) gid = 0;
137    int err;
138
139    SET_UID(uid, stat->uid);
140    SET_GID(gid, stat->gid);
141
142    if ((u64) stat->size > MAX_NON_LFS ||
143        !old_valid_dev(stat->dev) ||
144        !old_valid_dev(stat->rdev))
145        return -EOVERFLOW;
146    if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
147        return -EOVERFLOW;
148
149    if (clear_user(ubuf, sizeof(*ubuf)))
150        return -EFAULT;
151
152    err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
153    err |= __put_user(ino, &ubuf->st_ino);
154    err |= __put_user(stat->mode, &ubuf->st_mode);
155    err |= __put_user(stat->nlink, &ubuf->st_nlink);
156    err |= __put_user(uid, &ubuf->st_uid);
157    err |= __put_user(gid, &ubuf->st_gid);
158    err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
159    err |= __put_user(stat->size, &ubuf->st_size);
160    err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
161    err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
162    err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
163    err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
164    err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
165    err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
166    err |= __put_user(stat->blksize, &ubuf->st_blksize);
167    err |= __put_user(stat->blocks, &ubuf->st_blocks);
168    return err;
169}
170
171asmlinkage long compat_sys_newstat(char __user * filename,
172        struct compat_stat __user *statbuf)
173{
174    struct kstat stat;
175    int error;
176
177    error = vfs_stat(filename, &stat);
178    if (error)
179        return error;
180    return cp_compat_stat(&stat, statbuf);
181}
182
183asmlinkage long compat_sys_newlstat(char __user * filename,
184        struct compat_stat __user *statbuf)
185{
186    struct kstat stat;
187    int error;
188
189    error = vfs_lstat(filename, &stat);
190    if (error)
191        return error;
192    return cp_compat_stat(&stat, statbuf);
193}
194
195#ifndef __ARCH_WANT_STAT64
196asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
197        struct compat_stat __user *statbuf, int flag)
198{
199    struct kstat stat;
200    int error;
201
202    error = vfs_fstatat(dfd, filename, &stat, flag);
203    if (error)
204        return error;
205    return cp_compat_stat(&stat, statbuf);
206}
207#endif
208
209asmlinkage long compat_sys_newfstat(unsigned int fd,
210        struct compat_stat __user * statbuf)
211{
212    struct kstat stat;
213    int error = vfs_fstat(fd, &stat);
214
215    if (!error)
216        error = cp_compat_stat(&stat, statbuf);
217    return error;
218}
219
220static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
221{
222    
223    if (sizeof ubuf->f_blocks == 4) {
224        if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
225             kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
226            return -EOVERFLOW;
227        /* f_files and f_ffree may be -1; it's okay
228         * to stuff that into 32 bits */
229        if (kbuf->f_files != 0xffffffffffffffffULL
230         && (kbuf->f_files & 0xffffffff00000000ULL))
231            return -EOVERFLOW;
232        if (kbuf->f_ffree != 0xffffffffffffffffULL
233         && (kbuf->f_ffree & 0xffffffff00000000ULL))
234            return -EOVERFLOW;
235    }
236    if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
237        __put_user(kbuf->f_type, &ubuf->f_type) ||
238        __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
239        __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
240        __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
241        __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
242        __put_user(kbuf->f_files, &ubuf->f_files) ||
243        __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
244        __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
245        __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
246        __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
247        __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
248        __put_user(0, &ubuf->f_spare[0]) ||
249        __put_user(0, &ubuf->f_spare[1]) ||
250        __put_user(0, &ubuf->f_spare[2]) ||
251        __put_user(0, &ubuf->f_spare[3]) ||
252        __put_user(0, &ubuf->f_spare[4]))
253        return -EFAULT;
254    return 0;
255}
256
257/*
258 * The following statfs calls are copies of code from fs/open.c and
259 * should be checked against those from time to time
260 */
261asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
262{
263    struct path path;
264    int error;
265
266    error = user_path(pathname, &path);
267    if (!error) {
268        struct kstatfs tmp;
269        error = vfs_statfs(path.dentry, &tmp);
270        if (!error)
271            error = put_compat_statfs(buf, &tmp);
272        path_put(&path);
273    }
274    return error;
275}
276
277asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
278{
279    struct file * file;
280    struct kstatfs tmp;
281    int error;
282
283    error = -EBADF;
284    file = fget(fd);
285    if (!file)
286        goto out;
287    error = vfs_statfs(file->f_path.dentry, &tmp);
288    if (!error)
289        error = put_compat_statfs(buf, &tmp);
290    fput(file);
291out:
292    return error;
293}
294
295static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
296{
297    if (sizeof ubuf->f_blocks == 4) {
298        if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
299             kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
300            return -EOVERFLOW;
301        /* f_files and f_ffree may be -1; it's okay
302         * to stuff that into 32 bits */
303        if (kbuf->f_files != 0xffffffffffffffffULL
304         && (kbuf->f_files & 0xffffffff00000000ULL))
305            return -EOVERFLOW;
306        if (kbuf->f_ffree != 0xffffffffffffffffULL
307         && (kbuf->f_ffree & 0xffffffff00000000ULL))
308            return -EOVERFLOW;
309    }
310    if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
311        __put_user(kbuf->f_type, &ubuf->f_type) ||
312        __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
313        __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
314        __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
315        __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
316        __put_user(kbuf->f_files, &ubuf->f_files) ||
317        __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
318        __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
319        __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
320        __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
321        __put_user(kbuf->f_frsize, &ubuf->f_frsize))
322        return -EFAULT;
323    return 0;
324}
325
326asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
327{
328    struct path path;
329    int error;
330
331    if (sz != sizeof(*buf))
332        return -EINVAL;
333
334    error = user_path(pathname, &path);
335    if (!error) {
336        struct kstatfs tmp;
337        error = vfs_statfs(path.dentry, &tmp);
338        if (!error)
339            error = put_compat_statfs64(buf, &tmp);
340        path_put(&path);
341    }
342    return error;
343}
344
345asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
346{
347    struct file * file;
348    struct kstatfs tmp;
349    int error;
350
351    if (sz != sizeof(*buf))
352        return -EINVAL;
353
354    error = -EBADF;
355    file = fget(fd);
356    if (!file)
357        goto out;
358    error = vfs_statfs(file->f_path.dentry, &tmp);
359    if (!error)
360        error = put_compat_statfs64(buf, &tmp);
361    fput(file);
362out:
363    return error;
364}
365
366/*
367 * This is a copy of sys_ustat, just dealing with a structure layout.
368 * Given how simple this syscall is that apporach is more maintainable
369 * than the various conversion hacks.
370 */
371asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
372{
373    struct super_block *sb;
374    struct compat_ustat tmp;
375    struct kstatfs sbuf;
376    int err;
377
378    sb = user_get_super(new_decode_dev(dev));
379    if (!sb)
380        return -EINVAL;
381    err = vfs_statfs(sb->s_root, &sbuf);
382    drop_super(sb);
383    if (err)
384        return err;
385
386    memset(&tmp, 0, sizeof(struct compat_ustat));
387    tmp.f_tfree = sbuf.f_bfree;
388    tmp.f_tinode = sbuf.f_ffree;
389    if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
390        return -EFAULT;
391    return 0;
392}
393
394static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
395{
396    if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
397        __get_user(kfl->l_type, &ufl->l_type) ||
398        __get_user(kfl->l_whence, &ufl->l_whence) ||
399        __get_user(kfl->l_start, &ufl->l_start) ||
400        __get_user(kfl->l_len, &ufl->l_len) ||
401        __get_user(kfl->l_pid, &ufl->l_pid))
402        return -EFAULT;
403    return 0;
404}
405
406static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
407{
408    if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
409        __put_user(kfl->l_type, &ufl->l_type) ||
410        __put_user(kfl->l_whence, &ufl->l_whence) ||
411        __put_user(kfl->l_start, &ufl->l_start) ||
412        __put_user(kfl->l_len, &ufl->l_len) ||
413        __put_user(kfl->l_pid, &ufl->l_pid))
414        return -EFAULT;
415    return 0;
416}
417
418#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
419static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
420{
421    if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
422        __get_user(kfl->l_type, &ufl->l_type) ||
423        __get_user(kfl->l_whence, &ufl->l_whence) ||
424        __get_user(kfl->l_start, &ufl->l_start) ||
425        __get_user(kfl->l_len, &ufl->l_len) ||
426        __get_user(kfl->l_pid, &ufl->l_pid))
427        return -EFAULT;
428    return 0;
429}
430#endif
431
432#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
433static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
434{
435    if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
436        __put_user(kfl->l_type, &ufl->l_type) ||
437        __put_user(kfl->l_whence, &ufl->l_whence) ||
438        __put_user(kfl->l_start, &ufl->l_start) ||
439        __put_user(kfl->l_len, &ufl->l_len) ||
440        __put_user(kfl->l_pid, &ufl->l_pid))
441        return -EFAULT;
442    return 0;
443}
444#endif
445
446asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
447        unsigned long arg)
448{
449    mm_segment_t old_fs;
450    struct flock f;
451    long ret;
452
453    switch (cmd) {
454    case F_GETLK:
455    case F_SETLK:
456    case F_SETLKW:
457        ret = get_compat_flock(&f, compat_ptr(arg));
458        if (ret != 0)
459            break;
460        old_fs = get_fs();
461        set_fs(KERNEL_DS);
462        ret = sys_fcntl(fd, cmd, (unsigned long)&f);
463        set_fs(old_fs);
464        if (cmd == F_GETLK && ret == 0) {
465            /* GETLK was successful and we need to return the data...
466             * but it needs to fit in the compat structure.
467             * l_start shouldn't be too big, unless the original
468             * start + end is greater than COMPAT_OFF_T_MAX, in which
469             * case the app was asking for trouble, so we return
470             * -EOVERFLOW in that case.
471             * l_len could be too big, in which case we just truncate it,
472             * and only allow the app to see that part of the conflicting
473             * lock that might make sense to it anyway
474             */
475
476            if (f.l_start > COMPAT_OFF_T_MAX)
477                ret = -EOVERFLOW;
478            if (f.l_len > COMPAT_OFF_T_MAX)
479                f.l_len = COMPAT_OFF_T_MAX;
480            if (ret == 0)
481                ret = put_compat_flock(&f, compat_ptr(arg));
482        }
483        break;
484
485    case F_GETLK64:
486    case F_SETLK64:
487    case F_SETLKW64:
488        ret = get_compat_flock64(&f, compat_ptr(arg));
489        if (ret != 0)
490            break;
491        old_fs = get_fs();
492        set_fs(KERNEL_DS);
493        ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
494                ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
495                (unsigned long)&f);
496        set_fs(old_fs);
497        if (cmd == F_GETLK64 && ret == 0) {
498            /* need to return lock information - see above for commentary */
499            if (f.l_start > COMPAT_LOFF_T_MAX)
500                ret = -EOVERFLOW;
501            if (f.l_len > COMPAT_LOFF_T_MAX)
502                f.l_len = COMPAT_LOFF_T_MAX;
503            if (ret == 0)
504                ret = put_compat_flock64(&f, compat_ptr(arg));
505        }
506        break;
507
508    default:
509        ret = sys_fcntl(fd, cmd, arg);
510        break;
511    }
512    return ret;
513}
514
515asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
516        unsigned long arg)
517{
518    if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
519        return -EINVAL;
520    return compat_sys_fcntl64(fd, cmd, arg);
521}
522
523asmlinkage long
524compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
525{
526    long ret;
527    aio_context_t ctx64;
528
529    mm_segment_t oldfs = get_fs();
530    if (unlikely(get_user(ctx64, ctx32p)))
531        return -EFAULT;
532
533    set_fs(KERNEL_DS);
534    /* The __user pointer cast is valid because of the set_fs() */
535    ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
536    set_fs(oldfs);
537    /* truncating is ok because it's a user address */
538    if (!ret)
539        ret = put_user((u32) ctx64, ctx32p);
540    return ret;
541}
542
543asmlinkage long
544compat_sys_io_getevents(aio_context_t ctx_id,
545                 unsigned long min_nr,
546                 unsigned long nr,
547                 struct io_event __user *events,
548                 struct compat_timespec __user *timeout)
549{
550    long ret;
551    struct timespec t;
552    struct timespec __user *ut = NULL;
553
554    ret = -EFAULT;
555    if (unlikely(!access_ok(VERIFY_WRITE, events,
556                nr * sizeof(struct io_event))))
557        goto out;
558    if (timeout) {
559        if (get_compat_timespec(&t, timeout))
560            goto out;
561
562        ut = compat_alloc_user_space(sizeof(*ut));
563        if (copy_to_user(ut, &t, sizeof(t)) )
564            goto out;
565    }
566    ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
567out:
568    return ret;
569}
570
571static inline long
572copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
573{
574    compat_uptr_t uptr;
575    int i;
576
577    for (i = 0; i < nr; ++i) {
578        if (get_user(uptr, ptr32 + i))
579            return -EFAULT;
580        if (put_user(compat_ptr(uptr), ptr64 + i))
581            return -EFAULT;
582    }
583    return 0;
584}
585
586#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
587
588asmlinkage long
589compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
590{
591    struct iocb __user * __user *iocb64;
592    long ret;
593
594    if (unlikely(nr < 0))
595        return -EINVAL;
596
597    if (nr > MAX_AIO_SUBMITS)
598        nr = MAX_AIO_SUBMITS;
599    
600    iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
601    ret = copy_iocb(nr, iocb, iocb64);
602    if (!ret)
603        ret = sys_io_submit(ctx_id, nr, iocb64);
604    return ret;
605}
606
607struct compat_ncp_mount_data {
608    compat_int_t version;
609    compat_uint_t ncp_fd;
610    __compat_uid_t mounted_uid;
611    compat_pid_t wdog_pid;
612    unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
613    compat_uint_t time_out;
614    compat_uint_t retry_count;
615    compat_uint_t flags;
616    __compat_uid_t uid;
617    __compat_gid_t gid;
618    compat_mode_t file_mode;
619    compat_mode_t dir_mode;
620};
621
622struct compat_ncp_mount_data_v4 {
623    compat_int_t version;
624    compat_ulong_t flags;
625    compat_ulong_t mounted_uid;
626    compat_long_t wdog_pid;
627    compat_uint_t ncp_fd;
628    compat_uint_t time_out;
629    compat_uint_t retry_count;
630    compat_ulong_t uid;
631    compat_ulong_t gid;
632    compat_ulong_t file_mode;
633    compat_ulong_t dir_mode;
634};
635
636static void *do_ncp_super_data_conv(void *raw_data)
637{
638    int version = *(unsigned int *)raw_data;
639
640    if (version == 3) {
641        struct compat_ncp_mount_data *c_n = raw_data;
642        struct ncp_mount_data *n = raw_data;
643
644        n->dir_mode = c_n->dir_mode;
645        n->file_mode = c_n->file_mode;
646        n->gid = c_n->gid;
647        n->uid = c_n->uid;
648        memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
649        n->wdog_pid = c_n->wdog_pid;
650        n->mounted_uid = c_n->mounted_uid;
651    } else if (version == 4) {
652        struct compat_ncp_mount_data_v4 *c_n = raw_data;
653        struct ncp_mount_data_v4 *n = raw_data;
654
655        n->dir_mode = c_n->dir_mode;
656        n->file_mode = c_n->file_mode;
657        n->gid = c_n->gid;
658        n->uid = c_n->uid;
659        n->retry_count = c_n->retry_count;
660        n->time_out = c_n->time_out;
661        n->ncp_fd = c_n->ncp_fd;
662        n->wdog_pid = c_n->wdog_pid;
663        n->mounted_uid = c_n->mounted_uid;
664        n->flags = c_n->flags;
665    } else if (version != 5) {
666        return NULL;
667    }
668
669    return raw_data;
670}
671
672struct compat_smb_mount_data {
673    compat_int_t version;
674    __compat_uid_t mounted_uid;
675    __compat_uid_t uid;
676    __compat_gid_t gid;
677    compat_mode_t file_mode;
678    compat_mode_t dir_mode;
679};
680
681static void *do_smb_super_data_conv(void *raw_data)
682{
683    struct smb_mount_data *s = raw_data;
684    struct compat_smb_mount_data *c_s = raw_data;
685
686    if (c_s->version != SMB_MOUNT_OLDVERSION)
687        goto out;
688    s->dir_mode = c_s->dir_mode;
689    s->file_mode = c_s->file_mode;
690    s->gid = c_s->gid;
691    s->uid = c_s->uid;
692    s->mounted_uid = c_s->mounted_uid;
693 out:
694    return raw_data;
695}
696
697struct compat_nfs_string {
698    compat_uint_t len;
699    compat_uptr_t data;
700};
701
702static inline void compat_nfs_string(struct nfs_string *dst,
703                     struct compat_nfs_string *src)
704{
705    dst->data = compat_ptr(src->data);
706    dst->len = src->len;
707}
708
709struct compat_nfs4_mount_data_v1 {
710    compat_int_t version;
711    compat_int_t flags;
712    compat_int_t rsize;
713    compat_int_t wsize;
714    compat_int_t timeo;
715    compat_int_t retrans;
716    compat_int_t acregmin;
717    compat_int_t acregmax;
718    compat_int_t acdirmin;
719    compat_int_t acdirmax;
720    struct compat_nfs_string client_addr;
721    struct compat_nfs_string mnt_path;
722    struct compat_nfs_string hostname;
723    compat_uint_t host_addrlen;
724    compat_uptr_t host_addr;
725    compat_int_t proto;
726    compat_int_t auth_flavourlen;
727    compat_uptr_t auth_flavours;
728};
729
730static int do_nfs4_super_data_conv(void *raw_data)
731{
732    int version = *(compat_uint_t *) raw_data;
733
734    if (version == 1) {
735        struct compat_nfs4_mount_data_v1 *raw = raw_data;
736        struct nfs4_mount_data *real = raw_data;
737
738        /* copy the fields backwards */
739        real->auth_flavours = compat_ptr(raw->auth_flavours);
740        real->auth_flavourlen = raw->auth_flavourlen;
741        real->proto = raw->proto;
742        real->host_addr = compat_ptr(raw->host_addr);
743        real->host_addrlen = raw->host_addrlen;
744        compat_nfs_string(&real->hostname, &raw->hostname);
745        compat_nfs_string(&real->mnt_path, &raw->mnt_path);
746        compat_nfs_string(&real->client_addr, &raw->client_addr);
747        real->acdirmax = raw->acdirmax;
748        real->acdirmin = raw->acdirmin;
749        real->acregmax = raw->acregmax;
750        real->acregmin = raw->acregmin;
751        real->retrans = raw->retrans;
752        real->timeo = raw->timeo;
753        real->wsize = raw->wsize;
754        real->rsize = raw->rsize;
755        real->flags = raw->flags;
756        real->version = raw->version;
757    }
758
759    return 0;
760}
761
762#define SMBFS_NAME "smbfs"
763#define NCPFS_NAME "ncpfs"
764#define NFS4_NAME "nfs4"
765
766asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
767                 char __user * type, unsigned long flags,
768                 void __user * data)
769{
770    char *kernel_type;
771    unsigned long data_page;
772    char *kernel_dev;
773    char *dir_page;
774    int retval;
775
776    retval = copy_mount_string(type, &kernel_type);
777    if (retval < 0)
778        goto out;
779
780    dir_page = getname(dir_name);
781    retval = PTR_ERR(dir_page);
782    if (IS_ERR(dir_page))
783        goto out1;
784
785    retval = copy_mount_string(dev_name, &kernel_dev);
786    if (retval < 0)
787        goto out2;
788
789    retval = copy_mount_options(data, &data_page);
790    if (retval < 0)
791        goto out3;
792
793    retval = -EINVAL;
794
795    if (kernel_type && data_page) {
796        if (!strcmp(kernel_type, SMBFS_NAME)) {
797            do_smb_super_data_conv((void *)data_page);
798        } else if (!strcmp(kernel_type, NCPFS_NAME)) {
799            do_ncp_super_data_conv((void *)data_page);
800        } else if (!strcmp(kernel_type, NFS4_NAME)) {
801            if (do_nfs4_super_data_conv((void *) data_page))
802                goto out4;
803        }
804    }
805
806    retval = do_mount(kernel_dev, dir_page, kernel_type,
807            flags, (void*)data_page);
808
809 out4:
810    free_page(data_page);
811 out3:
812    kfree(kernel_dev);
813 out2:
814    putname(dir_page);
815 out1:
816    kfree(kernel_type);
817 out:
818    return retval;
819}
820
821#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
822
823struct compat_old_linux_dirent {
824    compat_ulong_t d_ino;
825    compat_ulong_t d_offset;
826    unsigned short d_namlen;
827    char d_name[1];
828};
829
830struct compat_readdir_callback {
831    struct compat_old_linux_dirent __user *dirent;
832    int result;
833};
834
835static int compat_fillonedir(void *__buf, const char *name, int namlen,
836            loff_t offset, u64 ino, unsigned int d_type)
837{
838    struct compat_readdir_callback *buf = __buf;
839    struct compat_old_linux_dirent __user *dirent;
840    compat_ulong_t d_ino;
841
842    if (buf->result)
843        return -EINVAL;
844    d_ino = ino;
845    if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
846        buf->result = -EOVERFLOW;
847        return -EOVERFLOW;
848    }
849    buf->result++;
850    dirent = buf->dirent;
851    if (!access_ok(VERIFY_WRITE, dirent,
852            (unsigned long)(dirent->d_name + namlen + 1) -
853                (unsigned long)dirent))
854        goto efault;
855    if ( __put_user(d_ino, &dirent->d_ino) ||
856        __put_user(offset, &dirent->d_offset) ||
857        __put_user(namlen, &dirent->d_namlen) ||
858        __copy_to_user(dirent->d_name, name, namlen) ||
859        __put_user(0, dirent->d_name + namlen))
860        goto efault;
861    return 0;
862efault:
863    buf->result = -EFAULT;
864    return -EFAULT;
865}
866
867asmlinkage long compat_sys_old_readdir(unsigned int fd,
868    struct compat_old_linux_dirent __user *dirent, unsigned int count)
869{
870    int error;
871    struct file *file;
872    struct compat_readdir_callback buf;
873
874    error = -EBADF;
875    file = fget(fd);
876    if (!file)
877        goto out;
878
879    buf.result = 0;
880    buf.dirent = dirent;
881
882    error = vfs_readdir(file, compat_fillonedir, &buf);
883    if (buf.result)
884        error = buf.result;
885
886    fput(file);
887out:
888    return error;
889}
890
891struct compat_linux_dirent {
892    compat_ulong_t d_ino;
893    compat_ulong_t d_off;
894    unsigned short d_reclen;
895    char d_name[1];
896};
897
898struct compat_getdents_callback {
899    struct compat_linux_dirent __user *current_dir;
900    struct compat_linux_dirent __user *previous;
901    int count;
902    int error;
903};
904
905static int compat_filldir(void *__buf, const char *name, int namlen,
906        loff_t offset, u64 ino, unsigned int d_type)
907{
908    struct compat_linux_dirent __user * dirent;
909    struct compat_getdents_callback *buf = __buf;
910    compat_ulong_t d_ino;
911    int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
912
913    buf->error = -EINVAL; /* only used if we fail.. */
914    if (reclen > buf->count)
915        return -EINVAL;
916    d_ino = ino;
917    if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
918        buf->error = -EOVERFLOW;
919        return -EOVERFLOW;
920    }
921    dirent = buf->previous;
922    if (dirent) {
923        if (__put_user(offset, &dirent->d_off))
924            goto efault;
925    }
926    dirent = buf->current_dir;
927    if (__put_user(d_ino, &dirent->d_ino))
928        goto efault;
929    if (__put_user(reclen, &dirent->d_reclen))
930        goto efault;
931    if (copy_to_user(dirent->d_name, name, namlen))
932        goto efault;
933    if (__put_user(0, dirent->d_name + namlen))
934        goto efault;
935    if (__put_user(d_type, (char __user *) dirent + reclen - 1))
936        goto efault;
937    buf->previous = dirent;
938    dirent = (void __user *)dirent + reclen;
939    buf->current_dir = dirent;
940    buf->count -= reclen;
941    return 0;
942efault:
943    buf->error = -EFAULT;
944    return -EFAULT;
945}
946
947asmlinkage long compat_sys_getdents(unsigned int fd,
948        struct compat_linux_dirent __user *dirent, unsigned int count)
949{
950    struct file * file;
951    struct compat_linux_dirent __user * lastdirent;
952    struct compat_getdents_callback buf;
953    int error;
954
955    error = -EFAULT;
956    if (!access_ok(VERIFY_WRITE, dirent, count))
957        goto out;
958
959    error = -EBADF;
960    file = fget(fd);
961    if (!file)
962        goto out;
963
964    buf.current_dir = dirent;
965    buf.previous = NULL;
966    buf.count = count;
967    buf.error = 0;
968
969    error = vfs_readdir(file, compat_filldir, &buf);
970    if (error >= 0)
971        error = buf.error;
972    lastdirent = buf.previous;
973    if (lastdirent) {
974        if (put_user(file->f_pos, &lastdirent->d_off))
975            error = -EFAULT;
976        else
977            error = count - buf.count;
978    }
979    fput(file);
980out:
981    return error;
982}
983
984#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
985
986struct compat_getdents_callback64 {
987    struct linux_dirent64 __user *current_dir;
988    struct linux_dirent64 __user *previous;
989    int count;
990    int error;
991};
992
993static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
994             u64 ino, unsigned int d_type)
995{
996    struct linux_dirent64 __user *dirent;
997    struct compat_getdents_callback64 *buf = __buf;
998    int jj = NAME_OFFSET(dirent);
999    int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1000    u64 off;
1001
1002    buf->error = -EINVAL; /* only used if we fail.. */
1003    if (reclen > buf->count)
1004        return -EINVAL;
1005    dirent = buf->previous;
1006
1007    if (dirent) {
1008        if (__put_user_unaligned(offset, &dirent->d_off))
1009            goto efault;
1010    }
1011    dirent = buf->current_dir;
1012    if (__put_user_unaligned(ino, &dirent->d_ino))
1013        goto efault;
1014    off = 0;
1015    if (__put_user_unaligned(off, &dirent->d_off))
1016        goto efault;
1017    if (__put_user(reclen, &dirent->d_reclen))
1018        goto efault;
1019    if (__put_user(d_type, &dirent->d_type))
1020        goto efault;
1021    if (copy_to_user(dirent->d_name, name, namlen))
1022        goto efault;
1023    if (__put_user(0, dirent->d_name + namlen))
1024        goto efault;
1025    buf->previous = dirent;
1026    dirent = (void __user *)dirent + reclen;
1027    buf->current_dir = dirent;
1028    buf->count -= reclen;
1029    return 0;
1030efault:
1031    buf->error = -EFAULT;
1032    return -EFAULT;
1033}
1034
1035asmlinkage long compat_sys_getdents64(unsigned int fd,
1036        struct linux_dirent64 __user * dirent, unsigned int count)
1037{
1038    struct file * file;
1039    struct linux_dirent64 __user * lastdirent;
1040    struct compat_getdents_callback64 buf;
1041    int error;
1042
1043    error = -EFAULT;
1044    if (!access_ok(VERIFY_WRITE, dirent, count))
1045        goto out;
1046
1047    error = -EBADF;
1048    file = fget(fd);
1049    if (!file)
1050        goto out;
1051
1052    buf.current_dir = dirent;
1053    buf.previous = NULL;
1054    buf.count = count;
1055    buf.error = 0;
1056
1057    error = vfs_readdir(file, compat_filldir64, &buf);
1058    if (error >= 0)
1059        error = buf.error;
1060    lastdirent = buf.previous;
1061    if (lastdirent) {
1062        typeof(lastdirent->d_off) d_off = file->f_pos;
1063        if (__put_user_unaligned(d_off, &lastdirent->d_off))
1064            error = -EFAULT;
1065        else
1066            error = count - buf.count;
1067    }
1068    fput(file);
1069out:
1070    return error;
1071}
1072#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1073
1074static ssize_t compat_do_readv_writev(int type, struct file *file,
1075                   const struct compat_iovec __user *uvector,
1076                   unsigned long nr_segs, loff_t *pos)
1077{
1078    compat_ssize_t tot_len;
1079    struct iovec iovstack[UIO_FASTIOV];
1080    struct iovec *iov=iovstack, *vector;
1081    ssize_t ret;
1082    int seg;
1083    io_fn_t fn;
1084    iov_fn_t fnv;
1085
1086    /*
1087     * SuS says "The readv() function *may* fail if the iovcnt argument
1088     * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1089     * traditionally returned zero for zero segments, so...
1090     */
1091    ret = 0;
1092    if (nr_segs == 0)
1093        goto out;
1094
1095    /*
1096     * First get the "struct iovec" from user memory and
1097     * verify all the pointers
1098     */
1099    ret = -EINVAL;
1100    if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1101        goto out;
1102    if (!file->f_op)
1103        goto out;
1104    if (nr_segs > UIO_FASTIOV) {
1105        ret = -ENOMEM;
1106        iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1107        if (!iov)
1108            goto out;
1109    }
1110    ret = -EFAULT;
1111    if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1112        goto out;
1113
1114    /*
1115     * Single unix specification:
1116     * We should -EINVAL if an element length is not >= 0 and fitting an
1117     * ssize_t. The total length is fitting an ssize_t
1118     *
1119     * Be careful here because iov_len is a size_t not an ssize_t
1120     */
1121    tot_len = 0;
1122    vector = iov;
1123    ret = -EINVAL;
1124    for (seg = 0 ; seg < nr_segs; seg++) {
1125        compat_ssize_t tmp = tot_len;
1126        compat_ssize_t len;
1127        compat_uptr_t buf;
1128
1129        if (__get_user(len, &uvector->iov_len) ||
1130            __get_user(buf, &uvector->iov_base)) {
1131            ret = -EFAULT;
1132            goto out;
1133        }
1134        if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1135            goto out;
1136        tot_len += len;
1137        if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1138            goto out;
1139        vector->iov_base = compat_ptr(buf);
1140        vector->iov_len = (compat_size_t) len;
1141        uvector++;
1142        vector++;
1143    }
1144    if (tot_len == 0) {
1145        ret = 0;
1146        goto out;
1147    }
1148
1149    ret = rw_verify_area(type, file, pos, tot_len);
1150    if (ret < 0)
1151        goto out;
1152
1153    fnv = NULL;
1154    if (type == READ) {
1155        fn = file->f_op->read;
1156        fnv = file->f_op->aio_read;
1157    } else {
1158        fn = (io_fn_t)file->f_op->write;
1159        fnv = file->f_op->aio_write;
1160    }
1161
1162    if (fnv)
1163        ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1164                        pos, fnv);
1165    else
1166        ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1167
1168out:
1169    if (iov != iovstack)
1170        kfree(iov);
1171    if ((ret + (type == READ)) > 0) {
1172        struct dentry *dentry = file->f_path.dentry;
1173        if (type == READ)
1174            fsnotify_access(dentry);
1175        else
1176            fsnotify_modify(dentry);
1177    }
1178    return ret;
1179}
1180
1181static size_t compat_readv(struct file *file,
1182               const struct compat_iovec __user *vec,
1183               unsigned long vlen, loff_t *pos)
1184{
1185    ssize_t ret = -EBADF;
1186
1187    if (!(file->f_mode & FMODE_READ))
1188        goto out;
1189
1190    ret = -EINVAL;
1191    if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1192        goto out;
1193
1194    ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1195
1196out:
1197    if (ret > 0)
1198        add_rchar(current, ret);
1199    inc_syscr(current);
1200    return ret;
1201}
1202
1203asmlinkage ssize_t
1204compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1205         unsigned long vlen)
1206{
1207    struct file *file;
1208    int fput_needed;
1209    ssize_t ret;
1210
1211    file = fget_light(fd, &fput_needed);
1212    if (!file)
1213        return -EBADF;
1214    ret = compat_readv(file, vec, vlen, &file->f_pos);
1215    fput_light(file, fput_needed);
1216    return ret;
1217}
1218
1219asmlinkage ssize_t
1220compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1221          unsigned long vlen, u32 pos_low, u32 pos_high)
1222{
1223    loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1224    struct file *file;
1225    int fput_needed;
1226    ssize_t ret;
1227
1228    if (pos < 0)
1229        return -EINVAL;
1230    file = fget_light(fd, &fput_needed);
1231    if (!file)
1232        return -EBADF;
1233    ret = compat_readv(file, vec, vlen, &pos);
1234    fput_light(file, fput_needed);
1235    return ret;
1236}
1237
1238static size_t compat_writev(struct file *file,
1239                const struct compat_iovec __user *vec,
1240                unsigned long vlen, loff_t *pos)
1241{
1242    ssize_t ret = -EBADF;
1243
1244    if (!(file->f_mode & FMODE_WRITE))
1245        goto out;
1246
1247    ret = -EINVAL;
1248    if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1249        goto out;
1250
1251    ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1252
1253out:
1254    if (ret > 0)
1255        add_wchar(current, ret);
1256    inc_syscw(current);
1257    return ret;
1258}
1259
1260asmlinkage ssize_t
1261compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1262          unsigned long vlen)
1263{
1264    struct file *file;
1265    int fput_needed;
1266    ssize_t ret;
1267
1268    file = fget_light(fd, &fput_needed);
1269    if (!file)
1270        return -EBADF;
1271    ret = compat_writev(file, vec, vlen, &file->f_pos);
1272    fput_light(file, fput_needed);
1273    return ret;
1274}
1275
1276asmlinkage ssize_t
1277compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1278           unsigned long vlen, u32 pos_low, u32 pos_high)
1279{
1280    loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1281    struct file *file;
1282    int fput_needed;
1283    ssize_t ret;
1284
1285    if (pos < 0)
1286        return -EINVAL;
1287    file = fget_light(fd, &fput_needed);
1288    if (!file)
1289        return -EBADF;
1290    ret = compat_writev(file, vec, vlen, &pos);
1291    fput_light(file, fput_needed);
1292    return ret;
1293}
1294
1295asmlinkage long
1296compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1297            unsigned int nr_segs, unsigned int flags)
1298{
1299    unsigned i;
1300    struct iovec __user *iov;
1301    if (nr_segs > UIO_MAXIOV)
1302        return -EINVAL;
1303    iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1304    for (i = 0; i < nr_segs; i++) {
1305        struct compat_iovec v;
1306        if (get_user(v.iov_base, &iov32[i].iov_base) ||
1307            get_user(v.iov_len, &iov32[i].iov_len) ||
1308            put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1309            put_user(v.iov_len, &iov[i].iov_len))
1310            return -EFAULT;
1311    }
1312    return sys_vmsplice(fd, iov, nr_segs, flags);
1313}
1314
1315/*
1316 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1317 * O_LARGEFILE flag.
1318 */
1319asmlinkage long
1320compat_sys_open(const char __user *filename, int flags, int mode)
1321{
1322    return do_sys_open(AT_FDCWD, filename, flags, mode);
1323}
1324
1325/*
1326 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1327 * O_LARGEFILE flag.
1328 */
1329asmlinkage long
1330compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1331{
1332    return do_sys_open(dfd, filename, flags, mode);
1333}
1334
1335/*
1336 * compat_count() counts the number of arguments/envelopes. It is basically
1337 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1338 * and envp pointers.
1339 */
1340static int compat_count(compat_uptr_t __user *argv, int max)
1341{
1342    int i = 0;
1343
1344    if (argv != NULL) {
1345        for (;;) {
1346            compat_uptr_t p;
1347
1348            if (get_user(p, argv))
1349                return -EFAULT;
1350            if (!p)
1351                break;
1352            argv++;
1353            if (i++ >= max)
1354                return -E2BIG;
1355        }
1356    }
1357    return i;
1358}
1359
1360/*
1361 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1362 * except that it works with 32 bit argv and envp pointers.
1363 */
1364static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1365                struct linux_binprm *bprm)
1366{
1367    struct page *kmapped_page = NULL;
1368    char *kaddr = NULL;
1369    unsigned long kpos = 0;
1370    int ret;
1371
1372    while (argc-- > 0) {
1373        compat_uptr_t str;
1374        int len;
1375        unsigned long pos;
1376
1377        if (get_user(str, argv+argc) ||
1378            !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1379            ret = -EFAULT;
1380            goto out;
1381        }
1382
1383        if (len > MAX_ARG_STRLEN) {
1384            ret = -E2BIG;
1385            goto out;
1386        }
1387
1388        /* We're going to work our way backwords. */
1389        pos = bprm->p;
1390        str += len;
1391        bprm->p -= len;
1392
1393        while (len > 0) {
1394            int offset, bytes_to_copy;
1395
1396            offset = pos % PAGE_SIZE;
1397            if (offset == 0)
1398                offset = PAGE_SIZE;
1399
1400            bytes_to_copy = offset;
1401            if (bytes_to_copy > len)
1402                bytes_to_copy = len;
1403
1404            offset -= bytes_to_copy;
1405            pos -= bytes_to_copy;
1406            str -= bytes_to_copy;
1407            len -= bytes_to_copy;
1408
1409            if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1410                struct page *page;
1411
1412#ifdef CONFIG_STACK_GROWSUP
1413                ret = expand_stack_downwards(bprm->vma, pos);
1414                if (ret < 0) {
1415                    /* We've exceed the stack rlimit. */
1416                    ret = -E2BIG;
1417                    goto out;
1418                }
1419#endif
1420                ret = get_user_pages(current, bprm->mm, pos,
1421                             1, 1, 1, &page, NULL);
1422                if (ret <= 0) {
1423                    /* We've exceed the stack rlimit. */
1424                    ret = -E2BIG;
1425                    goto out;
1426                }
1427
1428                if (kmapped_page) {
1429                    flush_kernel_dcache_page(kmapped_page);
1430                    kunmap(kmapped_page);
1431                    put_page(kmapped_page);
1432                }
1433                kmapped_page = page;
1434                kaddr = kmap(kmapped_page);
1435                kpos = pos & PAGE_MASK;
1436                flush_cache_page(bprm->vma, kpos,
1437                         page_to_pfn(kmapped_page));
1438            }
1439            if (copy_from_user(kaddr+offset, compat_ptr(str),
1440                        bytes_to_copy)) {
1441                ret = -EFAULT;
1442                goto out;
1443            }
1444        }
1445    }
1446    ret = 0;
1447out:
1448    if (kmapped_page) {
1449        flush_kernel_dcache_page(kmapped_page);
1450        kunmap(kmapped_page);
1451        put_page(kmapped_page);
1452    }
1453    return ret;
1454}
1455
1456/*
1457 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1458 * that it processes 32 bit argv and envp pointers.
1459 */
1460int compat_do_execve(char * filename,
1461    compat_uptr_t __user *argv,
1462    compat_uptr_t __user *envp,
1463    struct pt_regs * regs)
1464{
1465    struct linux_binprm *bprm;
1466    struct file *file;
1467    struct files_struct *displaced;
1468    bool clear_in_exec;
1469    int retval;
1470
1471    retval = unshare_files(&displaced);
1472    if (retval)
1473        goto out_ret;
1474
1475    retval = -ENOMEM;
1476    bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1477    if (!bprm)
1478        goto out_files;
1479
1480    retval = prepare_bprm_creds(bprm);
1481    if (retval)
1482        goto out_free;
1483
1484    retval = check_unsafe_exec(bprm);
1485    if (retval < 0)
1486        goto out_free;
1487    clear_in_exec = retval;
1488    current->in_execve = 1;
1489
1490    file = open_exec(filename);
1491    retval = PTR_ERR(file);
1492    if (IS_ERR(file))
1493        goto out_unmark;
1494
1495    sched_exec();
1496
1497    bprm->file = file;
1498    bprm->filename = filename;
1499    bprm->interp = filename;
1500
1501    retval = bprm_mm_init(bprm);
1502    if (retval)
1503        goto out_file;
1504
1505    bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1506    if ((retval = bprm->argc) < 0)
1507        goto out;
1508
1509    bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1510    if ((retval = bprm->envc) < 0)
1511        goto out;
1512
1513    retval = prepare_binprm(bprm);
1514    if (retval < 0)
1515        goto out;
1516
1517    retval = copy_strings_kernel(1, &bprm->filename, bprm);
1518    if (retval < 0)
1519        goto out;
1520
1521    bprm->exec = bprm->p;
1522    retval = compat_copy_strings(bprm->envc, envp, bprm);
1523    if (retval < 0)
1524        goto out;
1525
1526    retval = compat_copy_strings(bprm->argc, argv, bprm);
1527    if (retval < 0)
1528        goto out;
1529
1530    retval = search_binary_handler(bprm, regs);
1531    if (retval < 0)
1532        goto out;
1533
1534    current->stack_start = current->mm->start_stack;
1535
1536    /* execve succeeded */
1537    current->fs->in_exec = 0;
1538    current->in_execve = 0;
1539    acct_update_integrals(current);
1540    free_bprm(bprm);
1541    if (displaced)
1542        put_files_struct(displaced);
1543    return retval;
1544
1545out:
1546    if (bprm->mm)
1547        mmput(bprm->mm);
1548
1549out_file:
1550    if (bprm->file) {
1551        allow_write_access(bprm->file);
1552        fput(bprm->file);
1553    }
1554
1555out_unmark:
1556    if (clear_in_exec)
1557        current->fs->in_exec = 0;
1558    current->in_execve = 0;
1559
1560out_free:
1561    free_bprm(bprm);
1562
1563out_files:
1564    if (displaced)
1565        reset_files_struct(displaced);
1566out_ret:
1567    return retval;
1568}
1569
1570#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1571
1572static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1573                      int timeval, int ret)
1574{
1575    struct timespec ts;
1576
1577    if (!p)
1578        return ret;
1579
1580    if (current->personality & STICKY_TIMEOUTS)
1581        goto sticky;
1582
1583    /* No update for zero timeout */
1584    if (!end_time->tv_sec && !end_time->tv_nsec)
1585        return ret;
1586
1587    ktime_get_ts(&ts);
1588    ts = timespec_sub(*end_time, ts);
1589    if (ts.tv_sec < 0)
1590        ts.tv_sec = ts.tv_nsec = 0;
1591
1592    if (timeval) {
1593        struct compat_timeval rtv;
1594
1595        rtv.tv_sec = ts.tv_sec;
1596        rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1597
1598        if (!copy_to_user(p, &rtv, sizeof(rtv)))
1599            return ret;
1600    } else {
1601        struct compat_timespec rts;
1602
1603        rts.tv_sec = ts.tv_sec;
1604        rts.tv_nsec = ts.tv_nsec;
1605
1606        if (!copy_to_user(p, &rts, sizeof(rts)))
1607            return ret;
1608    }
1609    /*
1610     * If an application puts its timeval in read-only memory, we
1611     * don't want the Linux-specific update to the timeval to
1612     * cause a fault after the select has completed
1613     * successfully. However, because we're not updating the
1614     * timeval, we can't restart the system call.
1615     */
1616
1617sticky:
1618    if (ret == -ERESTARTNOHAND)
1619        ret = -EINTR;
1620    return ret;
1621}
1622
1623/*
1624 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1625 * 64-bit unsigned longs.
1626 */
1627static
1628int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1629            unsigned long *fdset)
1630{
1631    nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1632    if (ufdset) {
1633        unsigned long odd;
1634
1635        if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1636            return -EFAULT;
1637
1638        odd = nr & 1UL;
1639        nr &= ~1UL;
1640        while (nr) {
1641            unsigned long h, l;
1642            if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1643                return -EFAULT;
1644            ufdset += 2;
1645            *fdset++ = h << 32 | l;
1646            nr -= 2;
1647        }
1648        if (odd && __get_user(*fdset, ufdset))
1649            return -EFAULT;
1650    } else {
1651        /* Tricky, must clear full unsigned long in the
1652         * kernel fdset at the end, this makes sure that
1653         * actually happens.
1654         */
1655        memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1656    }
1657    return 0;
1658}
1659
1660static
1661int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1662              unsigned long *fdset)
1663{
1664    unsigned long odd;
1665    nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1666
1667    if (!ufdset)
1668        return 0;
1669
1670    odd = nr & 1UL;
1671    nr &= ~1UL;
1672    while (nr) {
1673        unsigned long h, l;
1674        l = *fdset++;
1675        h = l >> 32;
1676        if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1677            return -EFAULT;
1678        ufdset += 2;
1679        nr -= 2;
1680    }
1681    if (odd && __put_user(*fdset, ufdset))
1682        return -EFAULT;
1683    return 0;
1684}
1685
1686
1687/*
1688 * This is a virtual copy of sys_select from fs/select.c and probably
1689 * should be compared to it from time to time
1690 */
1691
1692/*
1693 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1694 * like to be certain this leads to no problems. So I return
1695 * EINTR just for safety.
1696 *
1697 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1698 * I'm trying ERESTARTNOHAND which restart only when you want to.
1699 */
1700#define MAX_SELECT_SECONDS \
1701    ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1702
1703int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1704    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1705    struct timespec *end_time)
1706{
1707    fd_set_bits fds;
1708    void *bits;
1709    int size, max_fds, ret = -EINVAL;
1710    struct fdtable *fdt;
1711    long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1712
1713    if (n < 0)
1714        goto out_nofds;
1715
1716    /* max_fds can increase, so grab it once to avoid race */
1717    rcu_read_lock();
1718    fdt = files_fdtable(current->files);
1719    max_fds = fdt->max_fds;
1720    rcu_read_unlock();
1721    if (n > max_fds)
1722        n = max_fds;
1723
1724    /*
1725     * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1726     * since we used fdset we need to allocate memory in units of
1727     * long-words.
1728     */
1729    size = FDS_BYTES(n);
1730    bits = stack_fds;
1731    if (size > sizeof(stack_fds) / 6) {
1732        bits = kmalloc(6 * size, GFP_KERNEL);
1733        ret = -ENOMEM;
1734        if (!bits)
1735            goto out_nofds;
1736    }
1737    fds.in = (unsigned long *) bits;
1738    fds.out = (unsigned long *) (bits + size);
1739    fds.ex = (unsigned long *) (bits + 2*size);
1740    fds.res_in = (unsigned long *) (bits + 3*size);
1741    fds.res_out = (unsigned long *) (bits + 4*size);
1742    fds.res_ex = (unsigned long *) (bits + 5*size);
1743
1744    if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1745        (ret = compat_get_fd_set(n, outp, fds.out)) ||
1746        (ret = compat_get_fd_set(n, exp, fds.ex)))
1747        goto out;
1748    zero_fd_set(n, fds.res_in);
1749    zero_fd_set(n, fds.res_out);
1750    zero_fd_set(n, fds.res_ex);
1751
1752    ret = do_select(n, &fds, end_time);
1753
1754    if (ret < 0)
1755        goto out;
1756    if (!ret) {
1757        ret = -ERESTARTNOHAND;
1758        if (signal_pending(current))
1759            goto out;
1760        ret = 0;
1761    }
1762
1763    if (compat_set_fd_set(n, inp, fds.res_in) ||
1764        compat_set_fd_set(n, outp, fds.res_out) ||
1765        compat_set_fd_set(n, exp, fds.res_ex))
1766        ret = -EFAULT;
1767out:
1768    if (bits != stack_fds)
1769        kfree(bits);
1770out_nofds:
1771    return ret;
1772}
1773
1774asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1775    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1776    struct compat_timeval __user *tvp)
1777{
1778    struct timespec end_time, *to = NULL;
1779    struct compat_timeval tv;
1780    int ret;
1781
1782    if (tvp) {
1783        if (copy_from_user(&tv, tvp, sizeof(tv)))
1784            return -EFAULT;
1785
1786        to = &end_time;
1787        if (poll_select_set_timeout(to,
1788                tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1789                (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1790            return -EINVAL;
1791    }
1792
1793    ret = compat_core_sys_select(n, inp, outp, exp, to);
1794    ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1795
1796    return ret;
1797}
1798
1799struct compat_sel_arg_struct {
1800    compat_ulong_t n;
1801    compat_uptr_t inp;
1802    compat_uptr_t outp;
1803    compat_uptr_t exp;
1804    compat_uptr_t tvp;
1805};
1806
1807asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1808{
1809    struct compat_sel_arg_struct a;
1810
1811    if (copy_from_user(&a, arg, sizeof(a)))
1812        return -EFAULT;
1813    return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1814                 compat_ptr(a.exp), compat_ptr(a.tvp));
1815}
1816
1817#ifdef HAVE_SET_RESTORE_SIGMASK
1818static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1819    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1820    struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1821    compat_size_t sigsetsize)
1822{
1823    compat_sigset_t ss32;
1824    sigset_t ksigmask, sigsaved;
1825    struct compat_timespec ts;
1826    struct timespec end_time, *to = NULL;
1827    int ret;
1828
1829    if (tsp) {
1830        if (copy_from_user(&ts, tsp, sizeof(ts)))
1831            return -EFAULT;
1832
1833        to = &end_time;
1834        if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1835            return -EINVAL;
1836    }
1837
1838    if (sigmask) {
1839        if (sigsetsize != sizeof(compat_sigset_t))
1840            return -EINVAL;
1841        if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1842            return -EFAULT;
1843        sigset_from_compat(&ksigmask, &ss32);
1844
1845        sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1846        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1847    }
1848
1849    ret = compat_core_sys_select(n, inp, outp, exp, to);
1850    ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1851
1852    if (ret == -ERESTARTNOHAND) {
1853        /*
1854         * Don't restore the signal mask yet. Let do_signal() deliver
1855         * the signal on the way back to userspace, before the signal
1856         * mask is restored.
1857         */
1858        if (sigmask) {
1859            memcpy(&current->saved_sigmask, &sigsaved,
1860                    sizeof(sigsaved));
1861            set_restore_sigmask();
1862        }
1863    } else if (sigmask)
1864        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1865
1866    return ret;
1867}
1868
1869asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1870    compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1871    struct compat_timespec __user *tsp, void __user *sig)
1872{
1873    compat_size_t sigsetsize = 0;
1874    compat_uptr_t up = 0;
1875
1876    if (sig) {
1877        if (!access_ok(VERIFY_READ, sig,
1878                sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1879                __get_user(up, (compat_uptr_t __user *)sig) ||
1880                __get_user(sigsetsize,
1881                (compat_size_t __user *)(sig+sizeof(up))))
1882            return -EFAULT;
1883    }
1884    return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1885                 sigsetsize);
1886}
1887
1888asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1889    unsigned int nfds, struct compat_timespec __user *tsp,
1890    const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1891{
1892    compat_sigset_t ss32;
1893    sigset_t ksigmask, sigsaved;
1894    struct compat_timespec ts;
1895    struct timespec end_time, *to = NULL;
1896    int ret;
1897
1898    if (tsp) {
1899        if (copy_from_user(&ts, tsp, sizeof(ts)))
1900            return -EFAULT;
1901
1902        to = &end_time;
1903        if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1904            return -EINVAL;
1905    }
1906
1907    if (sigmask) {
1908        if (sigsetsize != sizeof(compat_sigset_t))
1909            return -EINVAL;
1910        if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1911            return -EFAULT;
1912        sigset_from_compat(&ksigmask, &ss32);
1913
1914        sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1915        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1916    }
1917
1918    ret = do_sys_poll(ufds, nfds, to);
1919
1920    /* We can restart this syscall, usually */
1921    if (ret == -EINTR) {
1922        /*
1923         * Don't restore the signal mask yet. Let do_signal() deliver
1924         * the signal on the way back to userspace, before the signal
1925         * mask is restored.
1926         */
1927        if (sigmask) {
1928            memcpy(&current->saved_sigmask, &sigsaved,
1929                sizeof(sigsaved));
1930            set_restore_sigmask();
1931        }
1932        ret = -ERESTARTNOHAND;
1933    } else if (sigmask)
1934        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1935
1936    ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1937
1938    return ret;
1939}
1940#endif /* HAVE_SET_RESTORE_SIGMASK */
1941
1942#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1943/* Stuff for NFS server syscalls... */
1944struct compat_nfsctl_svc {
1945    u16 svc32_port;
1946    s32 svc32_nthreads;
1947};
1948
1949struct compat_nfsctl_client {
1950    s8 cl32_ident[NFSCLNT_IDMAX+1];
1951    s32 cl32_naddr;
1952    struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1953    s32 cl32_fhkeytype;
1954    s32 cl32_fhkeylen;
1955    u8 cl32_fhkey[NFSCLNT_KEYMAX];
1956};
1957
1958struct compat_nfsctl_export {
1959    char ex32_client[NFSCLNT_IDMAX+1];
1960    char ex32_path[NFS_MAXPATHLEN+1];
1961    compat_dev_t ex32_dev;
1962    compat_ino_t ex32_ino;
1963    compat_int_t ex32_flags;
1964    __compat_uid_t ex32_anon_uid;
1965    __compat_gid_t ex32_anon_gid;
1966};
1967
1968struct compat_nfsctl_fdparm {
1969    struct sockaddr gd32_addr;
1970    s8 gd32_path[NFS_MAXPATHLEN+1];
1971    compat_int_t gd32_version;
1972};
1973
1974struct compat_nfsctl_fsparm {
1975    struct sockaddr gd32_addr;
1976    s8 gd32_path[NFS_MAXPATHLEN+1];
1977    compat_int_t gd32_maxlen;
1978};
1979
1980struct compat_nfsctl_arg {
1981    compat_int_t ca32_version; /* safeguard */
1982    union {
1983        struct compat_nfsctl_svc u32_svc;
1984        struct compat_nfsctl_client u32_client;
1985        struct compat_nfsctl_export u32_export;
1986        struct compat_nfsctl_fdparm u32_getfd;
1987        struct compat_nfsctl_fsparm u32_getfs;
1988    } u;
1989#define ca32_svc u.u32_svc
1990#define ca32_client u.u32_client
1991#define ca32_export u.u32_export
1992#define ca32_getfd u.u32_getfd
1993#define ca32_getfs u.u32_getfs
1994};
1995
1996union compat_nfsctl_res {
1997    __u8 cr32_getfh[NFS_FHSIZE];
1998    struct knfsd_fh cr32_getfs;
1999};
2000
2001static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2002                struct compat_nfsctl_arg __user *arg)
2003{
2004    if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2005        get_user(karg->ca_version, &arg->ca32_version) ||
2006        __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2007        __get_user(karg->ca_svc.svc_nthreads,
2008                &arg->ca32_svc.svc32_nthreads))
2009        return -EFAULT;
2010    return 0;
2011}
2012
2013static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2014                struct compat_nfsctl_arg __user *arg)
2015{
2016    if (!access_ok(VERIFY_READ, &arg->ca32_client,
2017            sizeof(arg->ca32_client)) ||
2018        get_user(karg->ca_version, &arg->ca32_version) ||
2019        __copy_from_user(&karg->ca_client.cl_ident[0],
2020                &arg->ca32_client.cl32_ident[0],
2021                NFSCLNT_IDMAX) ||
2022        __get_user(karg->ca_client.cl_naddr,
2023                &arg->ca32_client.cl32_naddr) ||
2024        __copy_from_user(&karg->ca_client.cl_addrlist[0],
2025                &arg->ca32_client.cl32_addrlist[0],
2026                (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2027        __get_user(karg->ca_client.cl_fhkeytype,
2028                &arg->ca32_client.cl32_fhkeytype) ||
2029        __get_user(karg->ca_client.cl_fhkeylen,
2030                &arg->ca32_client.cl32_fhkeylen) ||
2031        __copy_from_user(&karg->ca_client.cl_fhkey[0],
2032                &arg->ca32_client.cl32_fhkey[0],
2033                NFSCLNT_KEYMAX))
2034        return -EFAULT;
2035
2036    return 0;
2037}
2038
2039static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2040                struct compat_nfsctl_arg __user *arg)
2041{
2042    if (!access_ok(VERIFY_READ, &arg->ca32_export,
2043                sizeof(arg->ca32_export)) ||
2044        get_user(karg->ca_version, &arg->ca32_version) ||
2045        __copy_from_user(&karg->ca_export.ex_client[0],
2046                &arg->ca32_export.ex32_client[0],
2047                NFSCLNT_IDMAX) ||
2048        __copy_from_user(&karg->ca_export.ex_path[0],
2049                &arg->ca32_export.ex32_path[0],
2050                NFS_MAXPATHLEN) ||
2051        __get_user(karg->ca_export.ex_dev,
2052                &arg->ca32_export.ex32_dev) ||
2053        __get_user(karg->ca_export.ex_ino,
2054                &arg->ca32_export.ex32_ino) ||
2055        __get_user(karg->ca_export.ex_flags,
2056                &arg->ca32_export.ex32_flags) ||
2057        __get_user(karg->ca_export.ex_anon_uid,
2058                &arg->ca32_export.ex32_anon_uid) ||
2059        __get_user(karg->ca_export.ex_anon_gid,
2060                &arg->ca32_export.ex32_anon_gid))
2061        return -EFAULT;
2062    SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2063    SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2064
2065    return 0;
2066}
2067
2068static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2069                struct compat_nfsctl_arg __user *arg)
2070{
2071    if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2072            sizeof(arg->ca32_getfd)) ||
2073        get_user(karg->ca_version, &arg->ca32_version) ||
2074        __copy_from_user(&karg->ca_getfd.gd_addr,
2075                &arg->ca32_getfd.gd32_addr,
2076                (sizeof(struct sockaddr))) ||
2077        __copy_from_user(&karg->ca_getfd.gd_path,
2078                &arg->ca32_getfd.gd32_path,
2079                (NFS_MAXPATHLEN+1)) ||
2080        __get_user(karg->ca_getfd.gd_version,
2081                &arg->ca32_getfd.gd32_version))
2082        return -EFAULT;
2083
2084    return 0;
2085}
2086
2087static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2088                struct compat_nfsctl_arg __user *arg)
2089{
2090    if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2091        get_user(karg->ca_version, &arg->ca32_version) ||
2092        __copy_from_user(&karg->ca_getfs.gd_addr,
2093                &arg->ca32_getfs.gd32_addr,
2094                (sizeof(struct sockaddr))) ||
2095        __copy_from_user(&karg->ca_getfs.gd_path,
2096                &arg->ca32_getfs.gd32_path,
2097                (NFS_MAXPATHLEN+1)) ||
2098        __get_user(karg->ca_getfs.gd_maxlen,
2099                &arg->ca32_getfs.gd32_maxlen))
2100        return -EFAULT;
2101
2102    return 0;
2103}
2104
2105/* This really doesn't need translations, we are only passing
2106 * back a union which contains opaque nfs file handle data.
2107 */
2108static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2109                union compat_nfsctl_res __user *res)
2110{
2111    int err;
2112
2113    err = copy_to_user(res, kres, sizeof(*res));
2114
2115    return (err) ? -EFAULT : 0;
2116}
2117
2118asmlinkage long compat_sys_nfsservctl(int cmd,
2119                struct compat_nfsctl_arg __user *arg,
2120                union compat_nfsctl_res __user *res)
2121{
2122    struct nfsctl_arg *karg;
2123    union nfsctl_res *kres;
2124    mm_segment_t oldfs;
2125    int err;
2126
2127    karg = kmalloc(sizeof(*karg), GFP_USER);
2128    kres = kmalloc(sizeof(*kres), GFP_USER);
2129    if(!karg || !kres) {
2130        err = -ENOMEM;
2131        goto done;
2132    }
2133
2134    switch(cmd) {
2135    case NFSCTL_SVC:
2136        err = compat_nfs_svc_trans(karg, arg);
2137        break;
2138
2139    case NFSCTL_ADDCLIENT:
2140        err = compat_nfs_clnt_trans(karg, arg);
2141        break;
2142
2143    case NFSCTL_DELCLIENT:
2144        err = compat_nfs_clnt_trans(karg, arg);
2145        break;
2146
2147    case NFSCTL_EXPORT:
2148    case NFSCTL_UNEXPORT:
2149        err = compat_nfs_exp_trans(karg, arg);
2150        break;
2151
2152    case NFSCTL_GETFD:
2153        err = compat_nfs_getfd_trans(karg, arg);
2154        break;
2155
2156    case NFSCTL_GETFS:
2157        err = compat_nfs_getfs_trans(karg, arg);
2158        break;
2159
2160    default:
2161        err = -EINVAL;
2162        break;
2163    }
2164
2165    if (err)
2166        goto done;
2167
2168    oldfs = get_fs();
2169    set_fs(KERNEL_DS);
2170    /* The __user pointer casts are valid because of the set_fs() */
2171    err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2172    set_fs(oldfs);
2173
2174    if (err)
2175        goto done;
2176
2177    if((cmd == NFSCTL_GETFD) ||
2178       (cmd == NFSCTL_GETFS))
2179        err = compat_nfs_getfh_res_trans(kres, res);
2180
2181done:
2182    kfree(karg);
2183    kfree(kres);
2184    return err;
2185}
2186#else /* !NFSD */
2187long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2188{
2189    return sys_ni_syscall();
2190}
2191#endif
2192
2193#ifdef CONFIG_EPOLL
2194
2195#ifdef HAVE_SET_RESTORE_SIGMASK
2196asmlinkage long compat_sys_epoll_pwait(int epfd,
2197            struct compat_epoll_event __user *events,
2198            int maxevents, int timeout,
2199            const compat_sigset_t __user *sigmask,
2200            compat_size_t sigsetsize)
2201{
2202    long err;
2203    compat_sigset_t csigmask;
2204    sigset_t ksigmask, sigsaved;
2205
2206    /*
2207     * If the caller wants a certain signal mask to be set during the wait,
2208     * we apply it here.
2209     */
2210    if (sigmask) {
2211        if (sigsetsize != sizeof(compat_sigset_t))
2212            return -EINVAL;
2213        if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2214            return -EFAULT;
2215        sigset_from_compat(&ksigmask, &csigmask);
2216        sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2217        sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2218    }
2219
2220    err = sys_epoll_wait(epfd, events, maxevents, timeout);
2221
2222    /*
2223     * If we changed the signal mask, we need to restore the original one.
2224     * In case we've got a signal while waiting, we do not restore the
2225     * signal mask yet, and we allow do_signal() to deliver the signal on
2226     * the way back to userspace, before the signal mask is restored.
2227     */
2228    if (sigmask) {
2229        if (err == -EINTR) {
2230            memcpy(&current->saved_sigmask, &sigsaved,
2231                   sizeof(sigsaved));
2232            set_restore_sigmask();
2233        } else
2234            sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2235    }
2236
2237    return err;
2238}
2239#endif /* HAVE_SET_RESTORE_SIGMASK */
2240
2241#endif /* CONFIG_EPOLL */
2242
2243#ifdef CONFIG_SIGNALFD
2244
2245asmlinkage long compat_sys_signalfd4(int ufd,
2246                     const compat_sigset_t __user *sigmask,
2247                     compat_size_t sigsetsize, int flags)
2248{
2249    compat_sigset_t ss32;
2250    sigset_t tmp;
2251    sigset_t __user *ksigmask;
2252
2253    if (sigsetsize != sizeof(compat_sigset_t))
2254        return -EINVAL;
2255    if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2256        return -EFAULT;
2257    sigset_from_compat(&tmp, &ss32);
2258    ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2259    if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2260        return -EFAULT;
2261
2262    return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2263}
2264
2265asmlinkage long compat_sys_signalfd(int ufd,
2266                    const compat_sigset_t __user *sigmask,
2267                    compat_size_t sigsetsize)
2268{
2269    return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2270}
2271#endif /* CONFIG_SIGNALFD */
2272
2273#ifdef CONFIG_TIMERFD
2274
2275asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2276                   const struct compat_itimerspec __user *utmr,
2277                   struct compat_itimerspec __user *otmr)
2278{
2279    int error;
2280    struct itimerspec t;
2281    struct itimerspec __user *ut;
2282
2283    if (get_compat_itimerspec(&t, utmr))
2284        return -EFAULT;
2285    ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2286    if (copy_to_user(&ut[0], &t, sizeof(t)))
2287        return -EFAULT;
2288    error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2289    if (!error && otmr)
2290        error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2291             put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2292
2293    return error;
2294}
2295
2296asmlinkage long compat_sys_timerfd_gettime(int ufd,
2297                   struct compat_itimerspec __user *otmr)
2298{
2299    int error;
2300    struct itimerspec t;
2301    struct itimerspec __user *ut;
2302
2303    ut = compat_alloc_user_space(sizeof(struct itimerspec));
2304    error = sys_timerfd_gettime(ufd, ut);
2305    if (!error)
2306        error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2307             put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2308
2309    return error;
2310}
2311
2312#endif /* CONFIG_TIMERFD */
2313

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