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