arch/x86/ia32/sys_ia32.c

   1 /*
   2  * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
   3  *             sys_sparc32
   4  *
   5  * Copyright (C) 2000           VA Linux Co
   6  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   7  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   8  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
  10  * Copyright (C) 2000           Hewlett-Packard Co.
  11  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  12  * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
  13  *
  14  * These routines maintain argument size conversion between 32bit and 64bit
  15  * environment. In 2.5 most of this should be moved to a generic directory.
  16  *
  17  * This file assumes that there is a hole at the end of user address space.
  18  *
  19  * Some of the functions are LE specific currently. These are
  20  * hopefully all marked.  This should be fixed.
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/fs.h>
  26 #include <linux/file.h>
  27 #include <linux/signal.h>
  28 #include <linux/syscalls.h>
  29 #include <linux/times.h>
  30 #include <linux/utsname.h>
  31 #include <linux/mm.h>
  32 #include <linux/uio.h>
  33 #include <linux/poll.h>
  34 #include <linux/personality.h>
  35 #include <linux/stat.h>
  36 #include <linux/rwsem.h>
  37 #include <linux/compat.h>
  38 #include <linux/vfs.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/highuid.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/slab.h>
  43 #include <asm/mman.h>
  44 #include <asm/types.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/atomic.h>
  47 #include <asm/vgtod.h>
  48 #include <asm/sys_ia32.h>
  49
  50 #define AA(__x)         ((unsigned long)(__x))
  51
  52
  53 asmlinkage long sys32_truncate64(const char __user *filename,
  54                                  unsigned long offset_low,
  55                                  unsigned long offset_high)
  56 {
  57        return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
  58 }
  59
  60 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
  61                                   unsigned long offset_high)
  62 {
  63        return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
  64 }
  65
  66 /*
  67  * Another set for IA32/LFS -- x86_64 struct stat is different due to
  68  * support for 64bit inode numbers.
  69  */
  70 static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
  71 {
  72         typeof(ubuf->st_uid) uid = 0;
  73         typeof(ubuf->st_gid) gid = 0;
  74         SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
  75         SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
  76         if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
  77             __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
  78             __put_user(stat->ino, &ubuf->__st_ino) ||
  79             __put_user(stat->ino, &ubuf->st_ino) ||
  80             __put_user(stat->mode, &ubuf->st_mode) ||
  81             __put_user(stat->nlink, &ubuf->st_nlink) ||
  82             __put_user(uid, &ubuf->st_uid) ||
  83             __put_user(gid, &ubuf->st_gid) ||
  84             __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
  85             __put_user(stat->size, &ubuf->st_size) ||
  86             __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
  87             __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
  88             __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
  89             __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
  90             __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
  91             __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
  92             __put_user(stat->blksize, &ubuf->st_blksize) ||
  93             __put_user(stat->blocks, &ubuf->st_blocks))
  94                 return -EFAULT;
  95         return 0;
  96 }
  97
  98 asmlinkage long sys32_stat64(const char __user *filename,
  99                              struct stat64 __user *statbuf)
 100 {
 101         struct kstat stat;
 102         int ret = vfs_stat(filename, &stat);
 103
 104         if (!ret)
 105                 ret = cp_stat64(statbuf, &stat);
 106         return ret;
 107 }
 108
 109 asmlinkage long sys32_lstat64(const char __user *filename,
 110                               struct stat64 __user *statbuf)
 111 {
 112         struct kstat stat;
 113         int ret = vfs_lstat(filename, &stat);
 114         if (!ret)
 115                 ret = cp_stat64(statbuf, &stat);
 116         return ret;
 117 }
 118
 119 asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
 120 {
 121         struct kstat stat;
 122         int ret = vfs_fstat(fd, &stat);
 123         if (!ret)
 124                 ret = cp_stat64(statbuf, &stat);
 125         return ret;
 126 }
 127
 128 asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename,
 129                               struct stat64 __user *statbuf, int flag)
 130 {
 131         struct kstat stat;
 132         int error;
 133
 134         error = vfs_fstatat(dfd, filename, &stat, flag);
 135         if (error)
 136                 return error;
 137         return cp_stat64(statbuf, &stat);
 138 }
 139
 140 /*
 141  * Linux/i386 didn't use to be able to handle more than
 142  * 4 system call parameters, so these system calls used a memory
 143  * block for parameter passing..
 144  */
 145
 146 struct mmap_arg_struct32 {
 147         unsigned int addr;
 148         unsigned int len;
 149         unsigned int prot;
 150         unsigned int flags;
 151         unsigned int fd;
 152         unsigned int offset;
 153 };
 154
 155 asmlinkage long sys32_mmap(struct mmap_arg_struct32 __user *arg)
 156 {
 157         struct mmap_arg_struct32 a;
 158
 159         if (copy_from_user(&a, arg, sizeof(a)))
 160                 return -EFAULT;
 161
 162         if (a.offset & ~PAGE_MASK)
 163                 return -EINVAL;
 164
 165         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 166                                a.offset>>PAGE_SHIFT);
 167 }
 168
 169 asmlinkage long sys32_mprotect(unsigned long start, size_t len,
 170                                unsigned long prot)
 171 {
 172         return sys_mprotect(start, len, prot);
 173 }
 174
 175 asmlinkage long sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
 176                                    struct sigaction32 __user *oact,
 177                                    unsigned int sigsetsize)
 178 {
 179         struct k_sigaction new_ka, old_ka;
 180         int ret;
 181         compat_sigset_t set32;
 182
 183         /* XXX: Don't preclude handling different sized sigset_t's.  */
 184         if (sigsetsize != sizeof(compat_sigset_t))
 185                 return -EINVAL;
 186
 187         if (act) {
 188                 compat_uptr_t handler, restorer;
 189
 190                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 191                     __get_user(handler, &act->sa_handler) ||
 192                     __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 193                     __get_user(restorer, &act->sa_restorer) ||
 194                     __copy_from_user(&set32, &act->sa_mask,
 195                                      sizeof(compat_sigset_t)))
 196                         return -EFAULT;
 197                 new_ka.sa.sa_handler = compat_ptr(handler);
 198                 new_ka.sa.sa_restorer = compat_ptr(restorer);
 199
 200                 /*
 201                  * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
 202                  * than _NSIG_WORDS << 1
 203                  */
 204                 switch (_NSIG_WORDS) {
 205                 case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
 206                                 | (((long)set32.sig[7]) << 32);
 207                 case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
 208                                 | (((long)set32.sig[5]) << 32);
 209                 case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
 210                                 | (((long)set32.sig[3]) << 32);
 211                 case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
 212                                 | (((long)set32.sig[1]) << 32);
 213                 }
 214         }
 215
 216         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 217
 218         if (!ret && oact) {
 219                 /*
 220                  * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
 221                  * than _NSIG_WORDS << 1
 222                  */
 223                 switch (_NSIG_WORDS) {
 224                 case 4:
 225                         set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
 226                         set32.sig[6] = old_ka.sa.sa_mask.sig[3];
 227                 case 3:
 228                         set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
 229                         set32.sig[4] = old_ka.sa.sa_mask.sig[2];
 230                 case 2:
 231                         set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
 232                         set32.sig[2] = old_ka.sa.sa_mask.sig[1];
 233                 case 1:
 234                         set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
 235                         set32.sig[0] = old_ka.sa.sa_mask.sig[0];
 236                 }
 237                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 238                     __put_user(ptr_to_compat(old_ka.sa.sa_handler),
 239                                &oact->sa_handler) ||
 240                     __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
 241                                &oact->sa_restorer) ||
 242                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 243                     __copy_to_user(&oact->sa_mask, &set32,
 244                                    sizeof(compat_sigset_t)))
 245                         return -EFAULT;
 246         }
 247
 248         return ret;
 249 }
 250
 251 asmlinkage long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
 252                                 struct old_sigaction32 __user *oact)
 253 {
 254         struct k_sigaction new_ka, old_ka;
 255         int ret;
 256
 257         if (act) {
 258                 compat_old_sigset_t mask;
 259                 compat_uptr_t handler, restorer;
 260
 261                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 262                     __get_user(handler, &act->sa_handler) ||
 263                     __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 264                     __get_user(restorer, &act->sa_restorer) ||
 265                     __get_user(mask, &act->sa_mask))
 266                         return -EFAULT;
 267
 268                 new_ka.sa.sa_handler = compat_ptr(handler);
 269                 new_ka.sa.sa_restorer = compat_ptr(restorer);
 270
 271                 siginitset(&new_ka.sa.sa_mask, mask);
 272         }
 273
 274         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 275
 276         if (!ret && oact) {
 277                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 278                     __put_user(ptr_to_compat(old_ka.sa.sa_handler),
 279                                &oact->sa_handler) ||
 280                     __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
 281                                &oact->sa_restorer) ||
 282                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 283                     __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 284                         return -EFAULT;
 285         }
 286
 287         return ret;
 288 }
 289
 290 asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int __user *stat_addr,
 291                               int options)
 292 {
 293         return compat_sys_wait4(pid, stat_addr, options, NULL);
 294 }
 295
 296 /* 32-bit timeval and related flotsam.  */
 297
 298 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
 299                                     struct compat_timespec __user *interval)
 300 {
 301         struct timespec t;
 302         int ret;
 303         mm_segment_t old_fs = get_fs();
 304
 305         set_fs(KERNEL_DS);
 306         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 307         set_fs(old_fs);
 308         if (put_compat_timespec(&t, interval))
 309                 return -EFAULT;
 310         return ret;
 311 }
 312
 313 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 314                                     compat_size_t sigsetsize)
 315 {
 316         sigset_t s;
 317         compat_sigset_t s32;
 318         int ret;
 319         mm_segment_t old_fs = get_fs();
 320
 321         set_fs(KERNEL_DS);
 322         ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
 323         set_fs(old_fs);
 324         if (!ret) {
 325                 switch (_NSIG_WORDS) {
 326                 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 327                 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 328                 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 329                 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 330                 }
 331                 if (copy_to_user(set, &s32, sizeof(compat_sigset_t)))
 332                         return -EFAULT;
 333         }
 334         return ret;
 335 }
 336
 337 asmlinkage long sys32_rt_sigqueueinfo(int pid, int sig,
 338                                       compat_siginfo_t __user *uinfo)
 339 {
 340         siginfo_t info;
 341         int ret;
 342         mm_segment_t old_fs = get_fs();
 343
 344         if (copy_siginfo_from_user32(&info, uinfo))
 345                 return -EFAULT;
 346         set_fs(KERNEL_DS);
 347         ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
 348         set_fs(old_fs);
 349         return ret;
 350 }
 351
 352 /* warning: next two assume little endian */
 353 asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
 354                             u32 poslo, u32 poshi)
 355 {
 356         return sys_pread64(fd, ubuf, count,
 357                          ((loff_t)AA(poshi) << 32) | AA(poslo));
 358 }
 359
 360 asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf,
 361                              u32 count, u32 poslo, u32 poshi)
 362 {
 363         return sys_pwrite64(fd, ubuf, count,
 364                           ((loff_t)AA(poshi) << 32) | AA(poslo));
 365 }
 366
 367
 368 asmlinkage long sys32_sendfile(int out_fd, int in_fd,
 369                                compat_off_t __user *offset, s32 count)
 370 {
 371         mm_segment_t old_fs = get_fs();
 372         int ret;
 373         off_t of;
 374
 375         if (offset && get_user(of, offset))
 376                 return -EFAULT;
 377
 378         set_fs(KERNEL_DS);
 379         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
 380                            count);
 381         set_fs(old_fs);
 382
 383         if (offset && put_user(of, offset))
 384                 return -EFAULT;
 385         return ret;
 386 }
 387
 388 /*
 389  * Some system calls that need sign extended arguments. This could be
 390  * done by a generic wrapper.
 391  */
 392 long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
 393 {
 394         return sys_lseek(fd, offset, whence);
 395 }
 396
 397 long sys32_kill(int pid, int sig)
 398 {
 399         return sys_kill(pid, sig);
 400 }
 401
 402 long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
 403                         __u32 len_low, __u32 len_high, int advice)
 404 {
 405         return sys_fadvise64_64(fd,
 406                                (((u64)offset_high)<<32) | offset_low,
 407                                (((u64)len_high)<<32) | len_low,
 408                                 advice);
 409 }
 410
 411 long sys32_vm86_warning(void)
 412 {
 413         struct task_struct *me = current;
 414         static char lastcomm[sizeof(me->comm)];
 415
 416         if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
 417                 compat_printk(KERN_INFO
 418                               "%s: vm86 mode not supported on 64 bit kernel\n",
 419                               me->comm);
 420                 strncpy(lastcomm, me->comm, sizeof(lastcomm));
 421         }
 422         return -ENOSYS;
 423 }
 424
 425 long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
 426                           char __user *buf, size_t len)
 427 {
 428         return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
 429 }
 430
 431 asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
 432                                    size_t count)
 433 {
 434         return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
 435 }
 436
 437 asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
 438                                       unsigned n_low, unsigned n_hi,  int flags)
 439 {
 440         return sys_sync_file_range(fd,
 441                                    ((u64)off_hi << 32) | off_low,
 442                                    ((u64)n_hi << 32) | n_low, flags);
 443 }
 444
 445 asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
 446                                 size_t len, int advice)
 447 {
 448         return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
 449                                 len, advice);
 450 }
 451
 452 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
 453                                 unsigned offset_hi, unsigned len_lo,
 454                                 unsigned len_hi)
 455 {
 456         return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
 457                              ((u64)len_hi << 32) | len_lo);
 458 }
 459
 460 asmlinkage long sys32_fanotify_mark(int fanotify_fd, unsigned int flags,
 461                                     u32 mask_lo, u32 mask_hi,
 462                                     int fd, const char  __user *pathname)
 463 {
 464         return sys_fanotify_mark(fanotify_fd, flags,
 465                                  ((u64)mask_hi << 32) | mask_lo,
 466                                  fd, pathname);
 467 }