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;
 210
 211         error = vfs_fstatat(dfd, filename, &stat, flag);
 212         if (error)
 213                 return error;
 214         return cp_compat_stat64(&stat, statbuf);
 215 }
 216
 217 asmlinkage long compat_sys_sysfs(int option, u32 arg1, u32 arg2)
 218 {
 219         return sys_sysfs(option, arg1, arg2);
 220 }
 221
 222 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval)
 223 {
 224         struct timespec t;
 225         int ret;
 226         mm_segment_t old_fs = get_fs ();
 227
 228         set_fs (KERNEL_DS);
 229         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *) &t);
 230         set_fs (old_fs);
 231         if (put_compat_timespec(&t, interval))
 232                 return -EFAULT;
 233         return ret;
 234 }
 235
 236 asmlinkage long compat_sys_rt_sigprocmask(int how,
 237                                           compat_sigset_t __user *set,
 238                                           compat_sigset_t __user *oset,
 239                                           compat_size_t sigsetsize)
 240 {
 241         sigset_t s;
 242         compat_sigset_t s32;
 243         int ret;
 244         mm_segment_t old_fs = get_fs();
 245
 246         if (set) {
 247                 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 248                         return -EFAULT;
 249                 switch (_NSIG_WORDS) {
 250                 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
 251                 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
 252                 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
 253                 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 254                 }
 255         }
 256         set_fs (KERNEL_DS);
 257         ret = sys_rt_sigprocmask(how,
 258                                  set ? (sigset_t __user *) &s : NULL,
 259                                  oset ? (sigset_t __user *) &s : NULL,
 260                                  sigsetsize);
 261         set_fs (old_fs);
 262         if (ret) return ret;
 263         if (oset) {
 264                 switch (_NSIG_WORDS) {
 265                 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 266                 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 267                 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 268                 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 269                 }
 270                 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 271                         return -EFAULT;
 272         }
 273         return 0;
 274 }
 275
 276 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 277                                     compat_size_t sigsetsize)
 278 {
 279         sigset_t s;
 280         compat_sigset_t s32;
 281         int ret;
 282         mm_segment_t old_fs = get_fs();
 283
 284         set_fs (KERNEL_DS);
 285         ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
 286         set_fs (old_fs);
 287         if (!ret) {
 288                 switch (_NSIG_WORDS) {
 289                 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 290                 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 291                 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 292                 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 293                 }
 294                 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 295                         return -EFAULT;
 296         }
 297         return ret;
 298 }
 299
 300 asmlinkage long compat_sys_rt_sigqueueinfo(int pid, int sig,
 301                                            struct compat_siginfo __user *uinfo)
 302 {
 303         siginfo_t info;
 304         int ret;
 305         mm_segment_t old_fs = get_fs();
 306
 307         if (copy_siginfo_from_user32(&info, uinfo))
 308                 return -EFAULT;
 309
 310         set_fs (KERNEL_DS);
 311         ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
 312         set_fs (old_fs);
 313         return ret;
 314 }
 315
 316 asmlinkage long compat_sys_sigaction(int sig, struct old_sigaction32 __user *act,
 317                                      struct old_sigaction32 __user *oact)
 318 {
 319         struct k_sigaction new_ka, old_ka;
 320         int ret;
 321
 322         WARN_ON_ONCE(sig >= 0);
 323         sig = -sig;
 324
 325         if (act) {
 326                 compat_old_sigset_t mask;
 327                 u32 u_handler, u_restorer;
 328
 329                 ret = get_user(u_handler, &act->sa_handler);
 330                 new_ka.sa.sa_handler =  compat_ptr(u_handler);
 331                 ret |= __get_user(u_restorer, &act->sa_restorer);
 332                 new_ka.sa.sa_restorer = compat_ptr(u_restorer);
 333                 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 334                 ret |= __get_user(mask, &act->sa_mask);
 335                 if (ret)
 336                         return ret;
 337                 new_ka.ka_restorer = NULL;
 338                 siginitset(&new_ka.sa.sa_mask, mask);
 339         }
 340
 341         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 342
 343         if (!ret && oact) {
 344                 ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
 345                 ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
 346                 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 347                 ret |= __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 348         }
 349
 350         return ret;
 351 }
 352
 353 asmlinkage long compat_sys_rt_sigaction(int sig,
 354                                         struct sigaction32 __user *act,
 355                                         struct sigaction32 __user *oact,
 356                                         void __user *restorer,
 357                                         compat_size_t sigsetsize)
 358 {
 359         struct k_sigaction new_ka, old_ka;
 360         int ret;
 361         compat_sigset_t set32;
 362
 363         /* XXX: Don't preclude handling different sized sigset_t's.  */
 364         if (sigsetsize != sizeof(compat_sigset_t))
 365                 return -EINVAL;
 366
 367         if (act) {
 368                 u32 u_handler, u_restorer;
 369
 370                 new_ka.ka_restorer = restorer;
 371                 ret = get_user(u_handler, &act->sa_handler);
 372                 new_ka.sa.sa_handler =  compat_ptr(u_handler);
 373                 ret |= __copy_from_user(&set32, &act->sa_mask, sizeof(compat_sigset_t));
 374                 switch (_NSIG_WORDS) {
 375                 case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6] | (((long)set32.sig[7]) << 32);
 376                 case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4] | (((long)set32.sig[5]) << 32);
 377                 case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2] | (((long)set32.sig[3]) << 32);
 378                 case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0] | (((long)set32.sig[1]) << 32);
 379                 }
 380                 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 381                 ret |= __get_user(u_restorer, &act->sa_restorer);
 382                 new_ka.sa.sa_restorer = compat_ptr(u_restorer);
 383                 if (ret)
 384                         return -EFAULT;
 385         }
 386
 387         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 388
 389         if (!ret && oact) {
 390                 switch (_NSIG_WORDS) {
 391                 case 4: set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32); set32.sig[6] = old_ka.sa.sa_mask.sig[3];
 392                 case 3: set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32); set32.sig[4] = old_ka.sa.sa_mask.sig[2];
 393                 case 2: set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32); set32.sig[2] = old_ka.sa.sa_mask.sig[1];
 394                 case 1: set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32); set32.sig[0] = old_ka.sa.sa_mask.sig[0];
 395                 }
 396                 ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
 397                 ret |= __copy_to_user(&oact->sa_mask, &set32, sizeof(compat_sigset_t));
 398                 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 399                 ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
 400                 if (ret)
 401                         ret = -EFAULT;
 402         }
 403
 404         return ret;
 405 }
 406
 407 /*
 408  * sparc32_execve() executes a new program after the asm stub has set
 409  * things up for us.  This should basically do what I want it to.
 410  */
 411 asmlinkage long sparc32_execve(struct pt_regs *regs)
 412 {
 413         int error, base = 0;
 414         char *filename;
 415
 416         /* User register window flush is done by entry.S */
 417
 418         /* Check for indirect call. */
 419         if ((u32)regs->u_regs[UREG_G1] == 0)
 420                 base = 1;
 421
 422         filename = getname(compat_ptr(regs->u_regs[base + UREG_I0]));
 423         error = PTR_ERR(filename);
 424         if (IS_ERR(filename))
 425                 goto out;
 426
 427         error = compat_do_execve(filename,
 428                                  compat_ptr(regs->u_regs[base + UREG_I1]),
 429                                  compat_ptr(regs->u_regs[base + UREG_I2]), regs);
 430
 431         putname(filename);
 432
 433         if (!error) {
 434                 fprs_write(0);
 435                 current_thread_info()->xfsr[0] = 0;
 436                 current_thread_info()->fpsaved[0] = 0;
 437                 regs->tstate &= ~TSTATE_PEF;
 438         }
 439 out:
 440         return error;
 441 }
 442
 443 #ifdef CONFIG_MODULES
 444
 445 asmlinkage long sys32_init_module(void __user *umod, u32 len,
 446                                   const char __user *uargs)
 447 {
 448         return sys_init_module(umod, len, uargs);
 449 }
 450
 451 asmlinkage long sys32_delete_module(const char __user *name_user,
 452                                     unsigned int flags)
 453 {
 454         return sys_delete_module(name_user, flags);
 455 }
 456
 457 #else /* CONFIG_MODULES */
 458
 459 asmlinkage long sys32_init_module(const char __user *name_user,
 460                                   struct module __user *mod_user)
 461 {
 462         return -ENOSYS;
 463 }
 464
 465 asmlinkage long sys32_delete_module(const char __user *name_user)
 466 {
 467         return -ENOSYS;
 468 }
 469
 470 #endif  /* CONFIG_MODULES */
 471
 472 asmlinkage compat_ssize_t sys32_pread64(unsigned int fd,
 473                                         char __user *ubuf,
 474                                         compat_size_t count,
 475                                         unsigned long poshi,
 476                                         unsigned long poslo)
 477 {
 478         return sys_pread64(fd, ubuf, count, (poshi << 32) | poslo);
 479 }
 480
 481 asmlinkage compat_ssize_t sys32_pwrite64(unsigned int fd,
 482                                          char __user *ubuf,
 483                                          compat_size_t count,
 484                                          unsigned long poshi,
 485                                          unsigned long poslo)
 486 {
 487         return sys_pwrite64(fd, ubuf, count, (poshi << 32) | poslo);
 488 }
 489
 490 asmlinkage long compat_sys_readahead(int fd,
 491                                      unsigned long offhi,
 492                                      unsigned long offlo,
 493                                      compat_size_t count)
 494 {
 495         return sys_readahead(fd, (offhi << 32) | offlo, count);
 496 }
 497
 498 long compat_sys_fadvise64(int fd,
 499                           unsigned long offhi,
 500                           unsigned long offlo,
 501                           compat_size_t len, int advice)
 502 {
 503         return sys_fadvise64_64(fd, (offhi << 32) | offlo, len, advice);
 504 }
 505
 506 long compat_sys_fadvise64_64(int fd,
 507                              unsigned long offhi, unsigned long offlo,
 508                              unsigned long lenhi, unsigned long lenlo,
 509                              int advice)
 510 {
 511         return sys_fadvise64_64(fd,
 512                                 (offhi << 32) | offlo,
 513                                 (lenhi << 32) | lenlo,
 514                                 advice);
 515 }
 516
 517 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 518                                     compat_off_t __user *offset,
 519                                     compat_size_t count)
 520 {
 521         mm_segment_t old_fs = get_fs();
 522         int ret;
 523         off_t of;
 524
 525         if (offset && get_user(of, offset))
 526                 return -EFAULT;
 527
 528         set_fs(KERNEL_DS);
 529         ret = sys_sendfile(out_fd, in_fd,
 530                            offset ? (off_t __user *) &of : NULL,
 531                            count);
 532         set_fs(old_fs);
 533
 534         if (offset && put_user(of, offset))
 535                 return -EFAULT;
 536
 537         return ret;
 538 }
 539
 540 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 541                                       compat_loff_t __user *offset,
 542                                       compat_size_t count)
 543 {
 544         mm_segment_t old_fs = get_fs();
 545         int ret;
 546         loff_t lof;
 547
 548         if (offset && get_user(lof, offset))
 549                 return -EFAULT;
 550
 551         set_fs(KERNEL_DS);
 552         ret = sys_sendfile64(out_fd, in_fd,
 553                              offset ? (loff_t __user *) &lof : NULL,
 554                              count);
 555         set_fs(old_fs);
 556
 557         if (offset && put_user(lof, offset))
 558                 return -EFAULT;
 559
 560         return ret;
 561 }
 562
 563 /* This is just a version for 32-bit applications which does
 564  * not force O_LARGEFILE on.
 565  */
 566
 567 asmlinkage long sparc32_open(const char __user *filename,
 568                              int flags, int mode)
 569 {
 570         return do_sys_open(AT_FDCWD, filename, flags, mode);
 571 }
 572
 573 extern unsigned long do_mremap(unsigned long addr,
 574         unsigned long old_len, unsigned long new_len,
 575         unsigned long flags, unsigned long new_addr);
 576
 577 asmlinkage unsigned long sys32_mremap(unsigned long addr,
 578         unsigned long old_len, unsigned long new_len,
 579         unsigned long flags, u32 __new_addr)
 580 {
 581         unsigned long ret = -EINVAL;
 582         unsigned long new_addr = __new_addr;
 583
 584         if (unlikely(sparc_mmap_check(addr, old_len)))
 585                 goto out;
 586         if (unlikely(sparc_mmap_check(new_addr, new_len)))
 587                 goto out;
 588         down_write(&current->mm->mmap_sem);
 589         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 590         up_write(&current->mm->mmap_sem);
 591 out:
 592         return ret;
 593 }
 594
 595 struct __sysctl_args32 {
 596         u32 name;
 597         int nlen;
 598         u32 oldval;
 599         u32 oldlenp;
 600         u32 newval;
 601         u32 newlen;
 602         u32 __unused[4];
 603 };
 604
 605 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 606 {
 607 #ifndef CONFIG_SYSCTL_SYSCALL
 608         return -ENOSYS;
 609 #else
 610         struct __sysctl_args32 tmp;
 611         int error;
 612         size_t oldlen, __user *oldlenp = NULL;
 613         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7UL) & ~7UL;
 614
 615         if (copy_from_user(&tmp, args, sizeof(tmp)))
 616                 return -EFAULT;
 617
 618         if (tmp.oldval && tmp.oldlenp) {
 619                 /* Duh, this is ugly and might not work if sysctl_args
 620                    is in read-only memory, but do_sysctl does indirectly
 621                    a lot of uaccess in both directions and we'd have to
 622                    basically copy the whole sysctl.c here, and
 623                    glibc's __sysctl uses rw memory for the structure
 624                    anyway.  */
 625                 if (get_user(oldlen, (u32 __user *)(unsigned long)tmp.oldlenp) ||
 626                     put_user(oldlen, (size_t __user *)addr))
 627                         return -EFAULT;
 628                 oldlenp = (size_t __user *)addr;
 629         }
 630
 631         lock_kernel();
 632         error = do_sysctl((int __user *)(unsigned long) tmp.name,
 633                           tmp.nlen,
 634                           (void __user *)(unsigned long) tmp.oldval,
 635                           oldlenp,
 636                           (void __user *)(unsigned long) tmp.newval,
 637                           tmp.newlen);
 638         unlock_kernel();
 639         if (oldlenp) {
 640                 if (!error) {
 641                         if (get_user(oldlen, (size_t __user *)addr) ||
 642                             put_user(oldlen, (u32 __user *)(unsigned long) tmp.oldlenp))
 643                                 error = -EFAULT;
 644                 }
 645                 if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
 646                         error = -EFAULT;
 647         }
 648         return error;
 649 #endif
 650 }
 651
 652 long sys32_lookup_dcookie(unsigned long cookie_high,
 653                           unsigned long cookie_low,
 654                           char __user *buf, size_t len)
 655 {
 656         return sys_lookup_dcookie((cookie_high << 32) | cookie_low,
 657                                   buf, len);
 658 }
 659
 660 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)
 661 {
 662         return sys_sync_file_range(fd,
 663                                    (off_high << 32) | off_low,
 664                                    (nb_high << 32) | nb_low,
 665                                    flags);
 666 }
 667
 668 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 669                                      u32 lenhi, u32 lenlo)
 670 {
 671         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 672                              ((loff_t)lenhi << 32) | lenlo);
 673 }