arch/sparc/kernel/sys_sparc32.c

   1 /* sys_sparc32.c: Conversion between 32bit and 64bit native syscalls.
   2  *
   3  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   4  * Copyright (C) 1997, 2007 David S. Miller (davem@davemloft.net)
   5  *
   6  * These routines maintain argument size conversion between 32bit and 64bit
   7  * environment.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/capability.h>
  13 #include <linux/fs.h>
  14 #include <linux/mm.h>
  15 #include <linux/file.h>
  16 #include <linux/signal.h>
  17 #include <linux/resource.h>
  18 #include <linux/times.h>
  19 #include <linux/utsname.h>
  20 #include <linux/smp.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/sem.h>
  23 #include <linux/msg.h>
  24 #include <linux/shm.h>
  25 #include <linux/slab.h>
  26 #include <linux/uio.h>
  27 #include <linux/nfs_fs.h>
  28 #include <linux/quota.h>
  29 #include <linux/module.h>
  30 #include <linux/sunrpc/svc.h>
  31 #include <linux/nfsd/nfsd.h>
  32 #include <linux/nfsd/cache.h>
  33 #include <linux/nfsd/xdr.h>
  34 #include <linux/nfsd/syscall.h>
  35 #include <linux/poll.h>
  36 #include <linux/personality.h>
  37 #include <linux/stat.h>
  38 #include <linux/filter.h>
  39 #include <linux/highmem.h>
  40 #include <linux/highuid.h>
  41 #include <linux/mman.h>
  42 #include <linux/ipv6.h>
  43 #include <linux/in.h>
  44 #include <linux/icmpv6.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/sysctl.h>
  47 #include <linux/binfmts.h>
  48 #include <linux/dnotify.h>
  49 #include <linux/security.h>
  50 #include <linux/compat.h>
  51 #include <linux/vfs.h>
  52 #include <linux/netfilter_ipv4/ip_tables.h>
  53 #include <linux/ptrace.h>
  54
  55 #include <asm/types.h>
  56 #include <asm/uaccess.h>
  57 #include <asm/fpumacro.h>
  58 #include <asm/mmu_context.h>
  59 #include <asm/compat_signal.h>
  60
  61 #ifdef CONFIG_SYSVIPC
  62 asmlinkage long compat_sys_ipc(u32 call, u32 first, u32 second, u32 third, compat_uptr_t ptr, u32 fifth)
  63 {
  64         int version;
  65
  66         version = call >> 16; /* hack for backward compatibility */
  67         call &= 0xffff;
  68
  69         switch (call) {
  70         case SEMTIMEDOP:
  71                 if (fifth)
  72                         /* sign extend semid */
  73                         return compat_sys_semtimedop((int)first,
  74                                                      compat_ptr(ptr), second,
  75                                                      compat_ptr(fifth));
  76                 /* else fall through for normal semop() */
  77         case SEMOP:
  78                 /* struct sembuf is the same on 32 and 64bit :)) */
  79                 /* sign extend semid */
  80                 return sys_semtimedop((int)first, compat_ptr(ptr), second,
  81                                       NULL);
  82         case SEMGET:
  83                 /* sign extend key, nsems */
  84                 return sys_semget((int)first, (int)second, third);
  85         case SEMCTL:
  86                 /* sign extend semid, semnum */
  87                 return compat_sys_semctl((int)first, (int)second, third,
  88                                          compat_ptr(ptr));
  89
  90         case MSGSND:
  91                 /* sign extend msqid */
  92                 return compat_sys_msgsnd((int)first, (int)second, third,
  93                                          compat_ptr(ptr));
  94         case MSGRCV:
  95                 /* sign extend msqid, msgtyp */
  96                 return compat_sys_msgrcv((int)first, second, (int)fifth,
  97                                          third, version, compat_ptr(ptr));
  98         case MSGGET:
  99                 /* sign extend key */
 100                 return sys_msgget((int)first, second);
 101         case MSGCTL:
 102                 /* sign extend msqid */
 103                 return compat_sys_msgctl((int)first, second, compat_ptr(ptr));
 104
 105         case SHMAT:
 106                 /* sign extend shmid */
 107                 return compat_sys_shmat((int)first, second, third, version,
 108                                         compat_ptr(ptr));
 109         case SHMDT:
 110                 return sys_shmdt(compat_ptr(ptr));
 111         case SHMGET:
 112                 /* sign extend key_t */
 113                 return sys_shmget((int)first, second, third);
 114         case SHMCTL:
 115                 /* sign extend shmid */
 116                 return compat_sys_shmctl((int)first, second, compat_ptr(ptr));
 117
 118         default:
 119                 return -ENOSYS;
 120         };
 121
 122         return -ENOSYS;
 123 }
 124 #endif
 125
 126 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
 127 {
 128         if ((int)high < 0)
 129                 return -EINVAL;
 130         else
 131                 return sys_truncate(path, (high << 32) | low);
 132 }
 133
 134 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
 135 {
 136         if ((int)high < 0)
 137                 return -EINVAL;
 138         else
 139                 return sys_ftruncate(fd, (high << 32) | low);
 140 }
 141
 142 static int cp_compat_stat64(struct kstat *stat,
 143                             struct compat_stat64 __user *statbuf)
 144 {
 145         int err;
 146
 147         err  = put_user(huge_encode_dev(stat->dev), &statbuf->st_dev);
 148         err |= put_user(stat->ino, &statbuf->st_ino);
 149         err |= put_user(stat->mode, &statbuf->st_mode);
 150         err |= put_user(stat->nlink, &statbuf->st_nlink);
 151         err |= put_user(stat->uid, &statbuf->st_uid);
 152         err |= put_user(stat->gid, &statbuf->st_gid);
 153         err |= put_user(huge_encode_dev(stat->rdev), &statbuf->st_rdev);
 154         err |= put_user(0, (unsigned long __user *) &statbuf->__pad3[0]);
 155         err |= put_user(stat->size, &statbuf->st_size);
 156         err |= put_user(stat->blksize, &statbuf->st_blksize);
 157         err |= put_user(0, (unsigned int __user *) &statbuf->__pad4[0]);
 158         err |= put_user(0, (unsigned int __user *) &statbuf->__pad4[4]);
 159         err |= put_user(stat->blocks, &statbuf->st_blocks);
 160         err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
 161         err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
 162         err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
 163         err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
 164         err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
 165         err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
 166         err |= put_user(0, &statbuf->__unused4);
 167         err |= put_user(0, &statbuf->__unused5);
 168
 169         return err;
 170 }
 171
 172 asmlinkage long compat_sys_stat64(char __user * filename,
 173                 struct compat_stat64 __user *statbuf)
 174 {
 175         struct kstat stat;
 176         int error = vfs_stat(filename, &stat);
 177
 178         if (!error)
 179                 error = cp_compat_stat64(&stat, statbuf);
 180         return error;
 181 }
 182
 183 asmlinkage long compat_sys_lstat64(char __user * filename,
 184                 struct compat_stat64 __user *statbuf)
 185 {
 186         struct kstat stat;
 187         int error = vfs_lstat(filename, &stat);
 188
 189         if (!error)
 190                 error = cp_compat_stat64(&stat, statbuf);
 191         return error;
 192 }
 193
 194 asmlinkage long compat_sys_fstat64(unsigned int fd,
 195                 struct compat_stat64 __user * statbuf)
 196 {
 197         struct kstat stat;
 198         int error = vfs_fstat(fd, &stat);
 199
 200         if (!error)
 201                 error = cp_compat_stat64(&stat, statbuf);
 202         return error;
 203 }
 204
 205 asmlinkage long compat_sys_fstatat64(unsigned int dfd, char __user *filename,
 206                 struct compat_stat64 __user * statbuf, int flag)
 207 {
 208         struct kstat stat;
 209         int error = -EINVAL;
 210
 211         if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
 212                 goto out;
 213
 214         if (flag & AT_SYMLINK_NOFOLLOW)
 215                 error = vfs_lstat_fd(dfd, filename, &stat);
 216         else
 217                 error = vfs_stat_fd(dfd, filename, &stat);
 218
 219         if (!error)
 220                 error = cp_compat_stat64(&stat, statbuf);
 221
 222 out:
 223         return error;
 224 }
 225
 226 asmlinkage long compat_sys_sysfs(int option, u32 arg1, u32 arg2)
 227 {
 228         return sys_sysfs(option, arg1, arg2);
 229 }
 230
 231 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval)
 232 {
 233         struct timespec t;
 234         int ret;
 235         mm_segment_t old_fs = get_fs ();
 236
 237         set_fs (KERNEL_DS);
 238         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *) &t);
 239         set_fs (old_fs);
 240         if (put_compat_timespec(&t, interval))
 241                 return -EFAULT;
 242         return ret;
 243 }
 244
 245 asmlinkage long compat_sys_rt_sigprocmask(int how,
 246                                           compat_sigset_t __user *set,
 247                                           compat_sigset_t __user *oset,
 248                                           compat_size_t sigsetsize)
 249 {
 250         sigset_t s;
 251         compat_sigset_t s32;
 252         int ret;
 253         mm_segment_t old_fs = get_fs();
 254
 255         if (set) {
 256                 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 257                         return -EFAULT;
 258                 switch (_NSIG_WORDS) {
 259                 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
 260                 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
 261                 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
 262                 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 263                 }
 264         }
 265         set_fs (KERNEL_DS);
 266         ret = sys_rt_sigprocmask(how,
 267                                  set ? (sigset_t __user *) &s : NULL,
 268                                  oset ? (sigset_t __user *) &s : NULL,
 269                                  sigsetsize);
 270         set_fs (old_fs);
 271         if (ret) return ret;
 272         if (oset) {
 273                 switch (_NSIG_WORDS) {
 274                 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 275                 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 276                 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 277                 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 278                 }
 279                 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 280                         return -EFAULT;
 281         }
 282         return 0;
 283 }
 284
 285 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 286                                     compat_size_t sigsetsize)
 287 {
 288         sigset_t s;
 289         compat_sigset_t s32;
 290         int ret;
 291         mm_segment_t old_fs = get_fs();
 292
 293         set_fs (KERNEL_DS);
 294         ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
 295         set_fs (old_fs);
 296         if (!ret) {
 297                 switch (_NSIG_WORDS) {
 298                 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 299                 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 300                 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 301                 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 302                 }
 303                 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 304                         return -EFAULT;
 305         }
 306         return ret;
 307 }
 308
 309 asmlinkage long compat_sys_rt_sigqueueinfo(int pid, int sig,
 310                                            struct compat_siginfo __user *uinfo)
 311 {
 312         siginfo_t info;
 313         int ret;
 314         mm_segment_t old_fs = get_fs();
 315
 316         if (copy_siginfo_from_user32(&info, uinfo))
 317                 return -EFAULT;
 318
 319         set_fs (KERNEL_DS);
 320         ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
 321         set_fs (old_fs);
 322         return ret;
 323 }
 324
 325 asmlinkage long compat_sys_sigaction(int sig, struct old_sigaction32 __user *act,
 326                                      struct old_sigaction32 __user *oact)
 327 {
 328         struct k_sigaction new_ka, old_ka;
 329         int ret;
 330
 331         WARN_ON_ONCE(sig >= 0);
 332         sig = -sig;
 333
 334         if (act) {
 335                 compat_old_sigset_t mask;
 336                 u32 u_handler, u_restorer;
 337
 338                 ret = get_user(u_handler, &act->sa_handler);
 339                 new_ka.sa.sa_handler =  compat_ptr(u_handler);
 340                 ret |= __get_user(u_restorer, &act->sa_restorer);
 341                 new_ka.sa.sa_restorer = compat_ptr(u_restorer);
 342                 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 343                 ret |= __get_user(mask, &act->sa_mask);
 344                 if (ret)
 345                         return ret;
 346                 new_ka.ka_restorer = NULL;
 347                 siginitset(&new_ka.sa.sa_mask, mask);
 348         }
 349
 350         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 351
 352         if (!ret && oact) {
 353                 ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
 354                 ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
 355                 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 356                 ret |= __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 357         }
 358
 359         return ret;
 360 }
 361
 362 asmlinkage long compat_sys_rt_sigaction(int sig,
 363                                         struct sigaction32 __user *act,
 364                                         struct sigaction32 __user *oact,
 365                                         void __user *restorer,
 366                                         compat_size_t sigsetsize)
 367 {
 368         struct k_sigaction new_ka, old_ka;
 369         int ret;
 370         compat_sigset_t set32;
 371
 372         /* XXX: Don't preclude handling different sized sigset_t's.  */
 373         if (sigsetsize != sizeof(compat_sigset_t))
 374                 return -EINVAL;
 375
 376         if (act) {
 377                 u32 u_handler, u_restorer;
 378
 379                 new_ka.ka_restorer = restorer;
 380                 ret = get_user(u_handler, &act->sa_handler);
 381                 new_ka.sa.sa_handler =  compat_ptr(u_handler);
 382                 ret |= __copy_from_user(&set32, &act->sa_mask, sizeof(compat_sigset_t));
 383                 switch (_NSIG_WORDS) {
 384                 case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6] | (((long)set32.sig[7]) << 32);
 385                 case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4] | (((long)set32.sig[5]) << 32);
 386                 case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2] | (((long)set32.sig[3]) << 32);
 387                 case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0] | (((long)set32.sig[1]) << 32);
 388                 }
 389                 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 390                 ret |= __get_user(u_restorer, &act->sa_restorer);
 391                 new_ka.sa.sa_restorer = compat_ptr(u_restorer);
 392                 if (ret)
 393                         return -EFAULT;
 394         }
 395
 396         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 397
 398         if (!ret && oact) {
 399                 switch (_NSIG_WORDS) {
 400                 case 4: set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32); set32.sig[6] = old_ka.sa.sa_mask.sig[3];
 401                 case 3: set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32); set32.sig[4] = old_ka.sa.sa_mask.sig[2];
 402                 case 2: set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32); set32.sig[2] = old_ka.sa.sa_mask.sig[1];
 403                 case 1: set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32); set32.sig[0] = old_ka.sa.sa_mask.sig[0];
 404                 }
 405                 ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
 406                 ret |= __copy_to_user(&oact->sa_mask, &set32, sizeof(compat_sigset_t));
 407                 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 408                 ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
 409                 if (ret)
 410                         ret = -EFAULT;
 411         }
 412
 413         return ret;
 414 }
 415
 416 /*
 417  * sparc32_execve() executes a new program after the asm stub has set
 418  * things up for us.  This should basically do what I want it to.
 419  */
 420 asmlinkage long sparc32_execve(struct pt_regs *regs)
 421 {
 422         int error, base = 0;
 423         char *filename;
 424
 425         /* User register window flush is done by entry.S */
 426
 427         /* Check for indirect call. */
 428         if ((u32)regs->u_regs[UREG_G1] == 0)
 429                 base = 1;
 430
 431         filename = getname(compat_ptr(regs->u_regs[base + UREG_I0]));
 432         error = PTR_ERR(filename);
 433         if (IS_ERR(filename))
 434                 goto out;
 435
 436         error = compat_do_execve(filename,
 437                                  compat_ptr(regs->u_regs[base + UREG_I1]),
 438                                  compat_ptr(regs->u_regs[base + UREG_I2]), regs);
 439
 440         putname(filename);
 441
 442         if (!error) {
 443                 fprs_write(0);
 444                 current_thread_info()->xfsr[0] = 0;
 445                 current_thread_info()->fpsaved[0] = 0;
 446                 regs->tstate &= ~TSTATE_PEF;
 447         }
 448 out:
 449         return error;
 450 }
 451
 452 #ifdef CONFIG_MODULES
 453
 454 asmlinkage long sys32_init_module(void __user *umod, u32 len,
 455                                   const char __user *uargs)
 456 {
 457         return sys_init_module(umod, len, uargs);
 458 }
 459
 460 asmlinkage long sys32_delete_module(const char __user *name_user,
 461                                     unsigned int flags)
 462 {
 463         return sys_delete_module(name_user, flags);
 464 }
 465
 466 #else /* CONFIG_MODULES */
 467
 468 asmlinkage long sys32_init_module(const char __user *name_user,
 469                                   struct module __user *mod_user)
 470 {
 471         return -ENOSYS;
 472 }
 473
 474 asmlinkage long sys32_delete_module(const char __user *name_user)
 475 {
 476         return -ENOSYS;
 477 }
 478
 479 #endif  /* CONFIG_MODULES */
 480
 481 asmlinkage compat_ssize_t sys32_pread64(unsigned int fd,
 482                                         char __user *ubuf,
 483                                         compat_size_t count,
 484                                         unsigned long poshi,
 485                                         unsigned long poslo)
 486 {
 487         return sys_pread64(fd, ubuf, count, (poshi << 32) | poslo);
 488 }
 489
 490 asmlinkage compat_ssize_t sys32_pwrite64(unsigned int fd,
 491                                          char __user *ubuf,
 492                                          compat_size_t count,
 493                                          unsigned long poshi,
 494                                          unsigned long poslo)
 495 {
 496         return sys_pwrite64(fd, ubuf, count, (poshi << 32) | poslo);
 497 }
 498
 499 asmlinkage long compat_sys_readahead(int fd,
 500                                      unsigned long offhi,
 501                                      unsigned long offlo,
 502                                      compat_size_t count)
 503 {
 504         return sys_readahead(fd, (offhi << 32) | offlo, count);
 505 }
 506
 507 long compat_sys_fadvise64(int fd,
 508                           unsigned long offhi,
 509                           unsigned long offlo,
 510                           compat_size_t len, int advice)
 511 {
 512         return sys_fadvise64_64(fd, (offhi << 32) | offlo, len, advice);
 513 }
 514
 515 long compat_sys_fadvise64_64(int fd,
 516                              unsigned long offhi, unsigned long offlo,
 517                              unsigned long lenhi, unsigned long lenlo,
 518                              int advice)
 519 {
 520         return sys_fadvise64_64(fd,
 521                                 (offhi << 32) | offlo,
 522                                 (lenhi << 32) | lenlo,
 523                                 advice);
 524 }
 525
 526 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 527                                     compat_off_t __user *offset,
 528                                     compat_size_t count)
 529 {
 530         mm_segment_t old_fs = get_fs();
 531         int ret;
 532         off_t of;
 533
 534         if (offset && get_user(of, offset))
 535                 return -EFAULT;
 536
 537         set_fs(KERNEL_DS);
 538         ret = sys_sendfile(out_fd, in_fd,
 539                            offset ? (off_t __user *) &of : NULL,
 540                            count);
 541         set_fs(old_fs);
 542
 543         if (offset && put_user(of, offset))
 544                 return -EFAULT;
 545
 546         return ret;
 547 }
 548
 549 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 550                                       compat_loff_t __user *offset,
 551                                       compat_size_t count)
 552 {
 553         mm_segment_t old_fs = get_fs();
 554         int ret;
 555         loff_t lof;
 556
 557         if (offset && get_user(lof, offset))
 558                 return -EFAULT;
 559
 560         set_fs(KERNEL_DS);
 561         ret = sys_sendfile64(out_fd, in_fd,
 562                              offset ? (loff_t __user *) &lof : NULL,
 563                              count);
 564         set_fs(old_fs);
 565
 566         if (offset && put_user(lof, offset))
 567                 return -EFAULT;
 568
 569         return ret;
 570 }
 571
 572 /* This is just a version for 32-bit applications which does
 573  * not force O_LARGEFILE on.
 574  */
 575
 576 asmlinkage long sparc32_open(const char __user *filename,
 577                              int flags, int mode)
 578 {
 579         return do_sys_open(AT_FDCWD, filename, flags, mode);
 580 }
 581
 582 extern unsigned long do_mremap(unsigned long addr,
 583         unsigned long old_len, unsigned long new_len,
 584         unsigned long flags, unsigned long new_addr);
 585
 586 asmlinkage unsigned long sys32_mremap(unsigned long addr,
 587         unsigned long old_len, unsigned long new_len,
 588         unsigned long flags, u32 __new_addr)
 589 {
 590         unsigned long ret = -EINVAL;
 591         unsigned long new_addr = __new_addr;
 592
 593         if (unlikely(sparc_mmap_check(addr, old_len)))
 594                 goto out;
 595         if (unlikely(sparc_mmap_check(new_addr, new_len)))
 596                 goto out;
 597         down_write(&current->mm->mmap_sem);
 598         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 599         up_write(&current->mm->mmap_sem);
 600 out:
 601         return ret;
 602 }
 603
 604 struct __sysctl_args32 {
 605         u32 name;
 606         int nlen;
 607         u32 oldval;
 608         u32 oldlenp;
 609         u32 newval;
 610         u32 newlen;
 611         u32 __unused[4];
 612 };
 613
 614 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 615 {
 616 #ifndef CONFIG_SYSCTL_SYSCALL
 617         return -ENOSYS;
 618 #else
 619         struct __sysctl_args32 tmp;
 620         int error;
 621         size_t oldlen, __user *oldlenp = NULL;
 622         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7UL) & ~7UL;
 623
 624         if (copy_from_user(&tmp, args, sizeof(tmp)))
 625                 return -EFAULT;
 626
 627         if (tmp.oldval && tmp.oldlenp) {
 628                 /* Duh, this is ugly and might not work if sysctl_args
 629                    is in read-only memory, but do_sysctl does indirectly
 630                    a lot of uaccess in both directions and we'd have to
 631                    basically copy the whole sysctl.c here, and
 632                    glibc's __sysctl uses rw memory for the structure
 633                    anyway.  */
 634                 if (get_user(oldlen, (u32 __user *)(unsigned long)tmp.oldlenp) ||
 635                     put_user(oldlen, (size_t __user *)addr))
 636                         return -EFAULT;
 637                 oldlenp = (size_t __user *)addr;
 638         }
 639
 640         lock_kernel();
 641         error = do_sysctl((int __user *)(unsigned long) tmp.name,
 642                           tmp.nlen,
 643                           (void __user *)(unsigned long) tmp.oldval,
 644                           oldlenp,
 645                           (void __user *)(unsigned long) tmp.newval,
 646                           tmp.newlen);
 647         unlock_kernel();
 648         if (oldlenp) {
 649                 if (!error) {
 650                         if (get_user(oldlen, (size_t __user *)addr) ||
 651                             put_user(oldlen, (u32 __user *)(unsigned long) tmp.oldlenp))
 652                                 error = -EFAULT;
 653                 }
 654                 if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
 655                         error = -EFAULT;
 656         }
 657         return error;
 658 #endif
 659 }
 660
 661 long sys32_lookup_dcookie(unsigned long cookie_high,
 662                           unsigned long cookie_low,
 663                           char __user *buf, size_t len)
 664 {
 665         return sys_lookup_dcookie((cookie_high << 32) | cookie_low,
 666                                   buf, len);
 667 }
 668
 669 long compat_sync_file_range(int fd, unsigned long off_high, unsigned long off_low, unsigned long nb_high, unsigned long nb_low, int flags)
 670 {
 671         return sys_sync_file_range(fd,
 672                                    (off_high << 32) | off_low,
 673                                    (nb_high << 32) | nb_low,
 674                                    flags);
 675 }
 676
 677 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 678                                      u32 lenhi, u32 lenlo)
 679 {
 680         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 681                              ((loff_t)lenhi << 32) | lenlo);
 682 }