arch/mips/kernel/linux32.c

   1 /*
   2  * Conversion between 32-bit and 64-bit native system calls.
   3  *
   4  * Copyright (C) 2000 Silicon Graphics, Inc.
   5  * Written by Ulf Carlsson (ulfc@engr.sgi.com)
   6  * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
   7  */
   8 #include <linux/compiler.h>
   9 #include <linux/mm.h>
  10 #include <linux/errno.h>
  11 #include <linux/file.h>
  12 #include <linux/smp_lock.h>
  13 #include <linux/highuid.h>
  14 #include <linux/dirent.h>
  15 #include <linux/resource.h>
  16 #include <linux/highmem.h>
  17 #include <linux/time.h>
  18 #include <linux/times.h>
  19 #include <linux/poll.h>
  20 #include <linux/slab.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/filter.h>
  23 #include <linux/shm.h>
  24 #include <linux/sem.h>
  25 #include <linux/msg.h>
  26 #include <linux/icmpv6.h>
  27 #include <linux/syscalls.h>
  28 #include <linux/sysctl.h>
  29 #include <linux/utime.h>
  30 #include <linux/utsname.h>
  31 #include <linux/personality.h>
  32 #include <linux/dnotify.h>
  33 #include <linux/module.h>
  34 #include <linux/binfmts.h>
  35 #include <linux/security.h>
  36 #include <linux/compat.h>
  37 #include <linux/vfs.h>
  38 #include <linux/ipc.h>
  39
  40 #include <net/sock.h>
  41 #include <net/scm.h>
  42
  43 #include <asm/compat-signal.h>
  44 #include <asm/sim.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/mmu_context.h>
  47 #include <asm/mman.h>
  48
  49 /* Use this to get at 32-bit user passed pointers. */
  50 /* A() macro should be used for places where you e.g.
  51    have some internal variable u32 and just want to get
  52    rid of a compiler warning. AA() has to be used in
  53    places where you want to convert a function argument
  54    to 32bit pointer or when you e.g. access pt_regs
  55    structure and want to consider 32bit registers only.
  56  */
  57 #define A(__x) ((unsigned long)(__x))
  58 #define AA(__x) ((unsigned long)((int)__x))
  59
  60 #ifdef __MIPSEB__
  61 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  62 #endif
  63 #ifdef __MIPSEL__
  64 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  65 #endif
  66
  67 /*
  68  * Revalidate the inode. This is required for proper NFS attribute caching.
  69  */
  70
  71 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
  72 {
  73         struct compat_stat tmp;
  74
  75         if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
  76                 return -EOVERFLOW;
  77
  78         memset(&tmp, 0, sizeof(tmp));
  79         tmp.st_dev = new_encode_dev(stat->dev);
  80         tmp.st_ino = stat->ino;
  81         if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
  82                 return -EOVERFLOW;
  83         tmp.st_mode = stat->mode;
  84         tmp.st_nlink = stat->nlink;
  85         SET_UID(tmp.st_uid, stat->uid);
  86         SET_GID(tmp.st_gid, stat->gid);
  87         tmp.st_rdev = new_encode_dev(stat->rdev);
  88         tmp.st_size = stat->size;
  89         tmp.st_atime = stat->atime.tv_sec;
  90         tmp.st_mtime = stat->mtime.tv_sec;
  91         tmp.st_ctime = stat->ctime.tv_sec;
  92 #ifdef STAT_HAVE_NSEC
  93         tmp.st_atime_nsec = stat->atime.tv_nsec;
  94         tmp.st_mtime_nsec = stat->mtime.tv_nsec;
  95         tmp.st_ctime_nsec = stat->ctime.tv_nsec;
  96 #endif
  97         tmp.st_blocks = stat->blocks;
  98         tmp.st_blksize = stat->blksize;
  99         return copy_to_user(statbuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
 100 }
 101
 102 asmlinkage unsigned long
 103 sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 104          unsigned long flags, unsigned long fd, unsigned long pgoff)
 105 {
 106         struct file * file = NULL;
 107         unsigned long error;
 108
 109         error = -EINVAL;
 110         if (pgoff & (~PAGE_MASK >> 12))
 111                 goto out;
 112         pgoff >>= PAGE_SHIFT-12;
 113
 114         if (!(flags & MAP_ANONYMOUS)) {
 115                 error = -EBADF;
 116                 file = fget(fd);
 117                 if (!file)
 118                         goto out;
 119         }
 120         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 121
 122         down_write(&current->mm->mmap_sem);
 123         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 124         up_write(&current->mm->mmap_sem);
 125         if (file)
 126                 fput(file);
 127
 128 out:
 129         return error;
 130 }
 131
 132
 133 asmlinkage int sys_truncate64(const char __user *path, unsigned int high,
 134                               unsigned int low)
 135 {
 136         if ((int)high < 0)
 137                 return -EINVAL;
 138         return sys_truncate(path, ((long) high << 32) | low);
 139 }
 140
 141 asmlinkage int sys_ftruncate64(unsigned int fd, unsigned int high,
 142                                unsigned int low)
 143 {
 144         if ((int)high < 0)
 145                 return -EINVAL;
 146         return sys_ftruncate(fd, ((long) high << 32) | low);
 147 }
 148
 149 /*
 150  * sys_execve() executes a new program.
 151  */
 152 asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
 153 {
 154         int error;
 155         char * filename;
 156
 157         filename = getname(compat_ptr(regs.regs[4]));
 158         error = PTR_ERR(filename);
 159         if (IS_ERR(filename))
 160                 goto out;
 161         error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
 162                                  compat_ptr(regs.regs[6]), &regs);
 163         putname(filename);
 164
 165 out:
 166         return error;
 167 }
 168
 169 #define RLIM_INFINITY32 0x7fffffff
 170 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
 171
 172 struct rlimit32 {
 173         int     rlim_cur;
 174         int     rlim_max;
 175 };
 176
 177 asmlinkage long sys32_truncate64(const char __user * path,
 178         unsigned long __dummy, int a2, int a3)
 179 {
 180         return sys_truncate(path, merge_64(a2, a3));
 181 }
 182
 183 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
 184         int a2, int a3)
 185 {
 186         return sys_ftruncate(fd, merge_64(a2, a3));
 187 }
 188
 189 static inline long
 190 get_tv32(struct timeval *o, struct compat_timeval __user *i)
 191 {
 192         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 193                 (__get_user(o->tv_sec, &i->tv_sec) |
 194                  __get_user(o->tv_usec, &i->tv_usec)));
 195 }
 196
 197 static inline long
 198 put_tv32(struct compat_timeval __user *o, struct timeval *i)
 199 {
 200         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 201                 (__put_user(i->tv_sec, &o->tv_sec) |
 202                  __put_user(i->tv_usec, &o->tv_usec)));
 203 }
 204
 205 extern struct timezone sys_tz;
 206
 207 asmlinkage int
 208 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 209 {
 210         if (tv) {
 211                 struct timeval ktv;
 212                 do_gettimeofday(&ktv);
 213                 if (put_tv32(tv, &ktv))
 214                         return -EFAULT;
 215         }
 216         if (tz) {
 217                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 218                         return -EFAULT;
 219         }
 220         return 0;
 221 }
 222
 223 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 224 {
 225         long usec;
 226
 227         if (!access_ok(VERIFY_READ, i, sizeof(*i)))
 228                 return -EFAULT;
 229         if (__get_user(o->tv_sec, &i->tv_sec))
 230                 return -EFAULT;
 231         if (__get_user(usec, &i->tv_usec))
 232                 return -EFAULT;
 233         o->tv_nsec = usec * 1000;
 234                 return 0;
 235 }
 236
 237 asmlinkage int
 238 sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 239 {
 240         struct timespec kts;
 241         struct timezone ktz;
 242
 243         if (tv) {
 244                 if (get_ts32(&kts, tv))
 245                         return -EFAULT;
 246         }
 247         if (tz) {
 248                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 249                         return -EFAULT;
 250         }
 251
 252         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 253 }
 254
 255 asmlinkage int sys32_llseek(unsigned int fd, unsigned int offset_high,
 256                             unsigned int offset_low, loff_t __user * result,
 257                             unsigned int origin)
 258 {
 259         return sys_llseek(fd, offset_high, offset_low, result, origin);
 260 }
 261
 262 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 263    lseek back to original location.  They fail just like lseek does on
 264    non-seekable files.  */
 265
 266 asmlinkage ssize_t sys32_pread(unsigned int fd, char __user * buf,
 267                                size_t count, u32 unused, u64 a4, u64 a5)
 268 {
 269         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 270 }
 271
 272 asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char __user * buf,
 273                                 size_t count, u32 unused, u64 a4, u64 a5)
 274 {
 275         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 276 }
 277
 278 asmlinkage int sys32_sched_rr_get_interval(compat_pid_t pid,
 279         struct compat_timespec __user *interval)
 280 {
 281         struct timespec t;
 282         int ret;
 283         mm_segment_t old_fs = get_fs();
 284
 285         set_fs(KERNEL_DS);
 286         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 287         set_fs(old_fs);
 288         if (put_user (t.tv_sec, &interval->tv_sec) ||
 289             __put_user(t.tv_nsec, &interval->tv_nsec))
 290                 return -EFAULT;
 291         return ret;
 292 }
 293
 294 #ifdef CONFIG_SYSVIPC
 295
 296 asmlinkage long
 297 sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
 298 {
 299         int version, err;
 300
 301         version = call >> 16; /* hack for backward compatibility */
 302         call &= 0xffff;
 303
 304         switch (call) {
 305         case SEMOP:
 306                 /* struct sembuf is the same on 32 and 64bit :)) */
 307                 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 308                 break;
 309         case SEMTIMEDOP:
 310                 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
 311                                             compat_ptr(fifth));
 312                 break;
 313         case SEMGET:
 314                 err = sys_semget(first, second, third);
 315                 break;
 316         case SEMCTL:
 317                 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
 318                 break;
 319         case MSGSND:
 320                 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
 321                 break;
 322         case MSGRCV:
 323                 err = compat_sys_msgrcv(first, second, fifth, third,
 324                                         version, compat_ptr(ptr));
 325                 break;
 326         case MSGGET:
 327                 err = sys_msgget((key_t) first, second);
 328                 break;
 329         case MSGCTL:
 330                 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
 331                 break;
 332         case SHMAT:
 333                 err = compat_sys_shmat(first, second, third, version,
 334                                        compat_ptr(ptr));
 335                 break;
 336         case SHMDT:
 337                 err = sys_shmdt(compat_ptr(ptr));
 338                 break;
 339         case SHMGET:
 340                 err = sys_shmget(first, (unsigned)second, third);
 341                 break;
 342         case SHMCTL:
 343                 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
 344                 break;
 345         default:
 346                 err = -EINVAL;
 347                 break;
 348         }
 349
 350         return err;
 351 }
 352
 353 #else
 354
 355 asmlinkage long
 356 sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
 357 {
 358         return -ENOSYS;
 359 }
 360
 361 #endif /* CONFIG_SYSVIPC */
 362
 363 #ifdef CONFIG_MIPS32_N32
 364 asmlinkage long sysn32_semctl(int semid, int semnum, int cmd, u32 arg)
 365 {
 366         /* compat_sys_semctl expects a pointer to union semun */
 367         u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
 368         if (put_user(arg, uptr))
 369                 return -EFAULT;
 370         return compat_sys_semctl(semid, semnum, cmd, uptr);
 371 }
 372
 373 asmlinkage long sysn32_msgsnd(int msqid, u32 msgp, unsigned msgsz, int msgflg)
 374 {
 375         return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 376 }
 377
 378 asmlinkage long sysn32_msgrcv(int msqid, u32 msgp, size_t msgsz, int msgtyp,
 379                               int msgflg)
 380 {
 381         return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
 382                                  compat_ptr(msgp));
 383 }
 384 #endif
 385
 386 struct sysctl_args32
 387 {
 388         compat_caddr_t name;
 389         int nlen;
 390         compat_caddr_t oldval;
 391         compat_caddr_t oldlenp;
 392         compat_caddr_t newval;
 393         compat_size_t newlen;
 394         unsigned int __unused[4];
 395 };
 396
 397 #ifdef CONFIG_SYSCTL_SYSCALL
 398
 399 asmlinkage long sys32_sysctl(struct sysctl_args32 __user *args)
 400 {
 401         struct sysctl_args32 tmp;
 402         int error;
 403         size_t oldlen;
 404         size_t __user *oldlenp = NULL;
 405         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 406
 407         if (copy_from_user(&tmp, args, sizeof(tmp)))
 408                 return -EFAULT;
 409
 410         if (tmp.oldval && tmp.oldlenp) {
 411                 /* Duh, this is ugly and might not work if sysctl_args
 412                    is in read-only memory, but do_sysctl does indirectly
 413                    a lot of uaccess in both directions and we'd have to
 414                    basically copy the whole sysctl.c here, and
 415                    glibc's __sysctl uses rw memory for the structure
 416                    anyway.  */
 417                 if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
 418                     put_user(oldlen, (size_t __user *)addr))
 419                         return -EFAULT;
 420                 oldlenp = (size_t __user *)addr;
 421         }
 422
 423         lock_kernel();
 424         error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
 425                           oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
 426         unlock_kernel();
 427         if (oldlenp) {
 428                 if (!error) {
 429                         if (get_user(oldlen, (size_t __user *)addr) ||
 430                             put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
 431                                 error = -EFAULT;
 432                 }
 433                 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
 434         }
 435         return error;
 436 }
 437
 438 #endif /* CONFIG_SYSCTL_SYSCALL */
 439
 440 asmlinkage long sys32_newuname(struct new_utsname __user * name)
 441 {
 442         int ret = 0;
 443
 444         down_read(&uts_sem);
 445         if (copy_to_user(name, utsname(), sizeof *name))
 446                 ret = -EFAULT;
 447         up_read(&uts_sem);
 448
 449         if (current->personality == PER_LINUX32 && !ret)
 450                 if (copy_to_user(name->machine, "mips\0\0\0", 8))
 451                         ret = -EFAULT;
 452
 453         return ret;
 454 }
 455
 456 asmlinkage int sys32_personality(unsigned long personality)
 457 {
 458         int ret;
 459         personality &= 0xffffffff;
 460         if (personality(current->personality) == PER_LINUX32 &&
 461             personality == PER_LINUX)
 462                 personality = PER_LINUX32;
 463         ret = sys_personality(personality);
 464         if (ret == PER_LINUX32)
 465                 ret = PER_LINUX;
 466         return ret;
 467 }
 468
 469 /* ustat compatibility */
 470 struct ustat32 {
 471         compat_daddr_t  f_tfree;
 472         compat_ino_t    f_tinode;
 473         char            f_fname[6];
 474         char            f_fpack[6];
 475 };
 476
 477 extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf);
 478
 479 asmlinkage int sys32_ustat(dev_t dev, struct ustat32 __user * ubuf32)
 480 {
 481         int err;
 482         struct ustat tmp;
 483         struct ustat32 tmp32;
 484         mm_segment_t old_fs = get_fs();
 485
 486         set_fs(KERNEL_DS);
 487         err = sys_ustat(dev, (struct ustat __user *)&tmp);
 488         set_fs(old_fs);
 489
 490         if (err)
 491                 goto out;
 492
 493         memset(&tmp32, 0, sizeof(struct ustat32));
 494         tmp32.f_tfree = tmp.f_tfree;
 495         tmp32.f_tinode = tmp.f_tinode;
 496
 497         err = copy_to_user(ubuf32, &tmp32, sizeof(struct ustat32)) ? -EFAULT : 0;
 498
 499 out:
 500         return err;
 501 }
 502
 503 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
 504         s32 count)
 505 {
 506         mm_segment_t old_fs = get_fs();
 507         int ret;
 508         off_t of;
 509
 510         if (offset && get_user(of, offset))
 511                 return -EFAULT;
 512
 513         set_fs(KERNEL_DS);
 514         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 515         set_fs(old_fs);
 516
 517         if (offset && put_user(of, offset))
 518                 return -EFAULT;
 519
 520         return ret;
 521 }
 522
 523 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 524                                    size_t count)
 525 {
 526         return sys_readahead(fd, merge_64(a2, a3), count);
 527 }
 528
 529 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 530         unsigned long a2, unsigned long a3,
 531         unsigned long a4, unsigned long a5,
 532         int flags)
 533 {
 534         return sys_sync_file_range(fd,
 535                         merge_64(a2, a3), merge_64(a4, a5),
 536                         flags);
 537 }
 538
 539 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 540         unsigned long a2, unsigned long a3,
 541         unsigned long a4, unsigned long a5,
 542         int flags)
 543 {
 544         return sys_fadvise64_64(fd,
 545                         merge_64(a2, a3), merge_64(a4, a5),
 546                         flags);
 547 }
 548
 549 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 550         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 551 {
 552         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 553                              merge_64(len_a4, len_a5));
 554 }
 555
 556 save_static_function(sys32_clone);
 557 static int noinline __used
 558 _sys32_clone(nabi_no_regargs struct pt_regs regs)
 559 {
 560         unsigned long clone_flags;
 561         unsigned long newsp;
 562         int __user *parent_tidptr, *child_tidptr;
 563
 564         clone_flags = regs.regs[4];
 565         newsp = regs.regs[5];
 566         if (!newsp)
 567                 newsp = regs.regs[29];
 568         parent_tidptr = (int __user *) regs.regs[6];
 569
 570         /* Use __dummy4 instead of getting it off the stack, so that
 571            syscall() works.  */
 572         child_tidptr = (int __user *) __dummy4;
 573         return do_fork(clone_flags, newsp, &regs, 0,
 574                        parent_tidptr, child_tidptr);
 575 }