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
  39 #include <net/sock.h>
  40 #include <net/scm.h>
  41
  42 #include <asm/compat-signal.h>
  43 #include <asm/ipc.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 #ifdef __MIPSEB__
 178 asmlinkage long sys32_truncate64(const char __user * path, unsigned long __dummy,
 179         int length_hi, int length_lo)
 180 #endif
 181 #ifdef __MIPSEL__
 182 asmlinkage long sys32_truncate64(const char __user * path, unsigned long __dummy,
 183         int length_lo, int length_hi)
 184 #endif
 185 {
 186         loff_t length;
 187
 188         length = ((unsigned long) length_hi << 32) | (unsigned int) length_lo;
 189
 190         return sys_truncate(path, length);
 191 }
 192
 193 #ifdef __MIPSEB__
 194 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
 195         int length_hi, int length_lo)
 196 #endif
 197 #ifdef __MIPSEL__
 198 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
 199         int length_lo, int length_hi)
 200 #endif
 201 {
 202         loff_t length;
 203
 204         length = ((unsigned long) length_hi << 32) | (unsigned int) length_lo;
 205
 206         return sys_ftruncate(fd, length);
 207 }
 208
 209 static inline long
 210 get_tv32(struct timeval *o, struct compat_timeval __user *i)
 211 {
 212         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 213                 (__get_user(o->tv_sec, &i->tv_sec) |
 214                  __get_user(o->tv_usec, &i->tv_usec)));
 215 }
 216
 217 static inline long
 218 put_tv32(struct compat_timeval __user *o, struct timeval *i)
 219 {
 220         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 221                 (__put_user(i->tv_sec, &o->tv_sec) |
 222                  __put_user(i->tv_usec, &o->tv_usec)));
 223 }
 224
 225 extern struct timezone sys_tz;
 226
 227 asmlinkage int
 228 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 229 {
 230         if (tv) {
 231                 struct timeval ktv;
 232                 do_gettimeofday(&ktv);
 233                 if (put_tv32(tv, &ktv))
 234                         return -EFAULT;
 235         }
 236         if (tz) {
 237                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 238                         return -EFAULT;
 239         }
 240         return 0;
 241 }
 242
 243 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 244 {
 245         long usec;
 246
 247         if (!access_ok(VERIFY_READ, i, sizeof(*i)))
 248                 return -EFAULT;
 249         if (__get_user(o->tv_sec, &i->tv_sec))
 250                 return -EFAULT;
 251         if (__get_user(usec, &i->tv_usec))
 252                 return -EFAULT;
 253         o->tv_nsec = usec * 1000;
 254                 return 0;
 255 }
 256
 257 asmlinkage int
 258 sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 259 {
 260         struct timespec kts;
 261         struct timezone ktz;
 262
 263         if (tv) {
 264                 if (get_ts32(&kts, tv))
 265                         return -EFAULT;
 266         }
 267         if (tz) {
 268                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 269                         return -EFAULT;
 270         }
 271
 272         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 273 }
 274
 275 asmlinkage int sys32_llseek(unsigned int fd, unsigned int offset_high,
 276                             unsigned int offset_low, loff_t __user * result,
 277                             unsigned int origin)
 278 {
 279         return sys_llseek(fd, offset_high, offset_low, result, origin);
 280 }
 281
 282 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 283    lseek back to original location.  They fail just like lseek does on
 284    non-seekable files.  */
 285
 286 asmlinkage ssize_t sys32_pread(unsigned int fd, char __user * buf,
 287                                size_t count, u32 unused, u64 a4, u64 a5)
 288 {
 289         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 290 }
 291
 292 asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char __user * buf,
 293                                 size_t count, u32 unused, u64 a4, u64 a5)
 294 {
 295         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 296 }
 297
 298 asmlinkage int 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_user (t.tv_sec, &interval->tv_sec) ||
 309             __put_user (t.tv_nsec, &interval->tv_nsec))
 310                 return -EFAULT;
 311         return ret;
 312 }
 313
 314 asmlinkage long
 315 sys32_ipc (u32 call, int first, int second, int third, u32 ptr, u32 fifth)
 316 {
 317         int version, err;
 318
 319         version = call >> 16; /* hack for backward compatibility */
 320         call &= 0xffff;
 321
 322         switch (call) {
 323         case SEMOP:
 324                 /* struct sembuf is the same on 32 and 64bit :)) */
 325                 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 326                 break;
 327         case SEMTIMEDOP:
 328                 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
 329                                             compat_ptr(fifth));
 330                 break;
 331         case SEMGET:
 332                 err = sys_semget(first, second, third);
 333                 break;
 334         case SEMCTL:
 335                 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
 336                 break;
 337         case MSGSND:
 338                 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
 339                 break;
 340         case MSGRCV:
 341                 err = compat_sys_msgrcv(first, second, fifth, third,
 342                                         version, compat_ptr(ptr));
 343                 break;
 344         case MSGGET:
 345                 err = sys_msgget((key_t) first, second);
 346                 break;
 347         case MSGCTL:
 348                 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
 349                 break;
 350         case SHMAT:
 351                 err = compat_sys_shmat(first, second, third, version,
 352                                        compat_ptr(ptr));
 353                 break;
 354         case SHMDT:
 355                 err = sys_shmdt(compat_ptr(ptr));
 356                 break;
 357         case SHMGET:
 358                 err = sys_shmget(first, (unsigned)second, third);
 359                 break;
 360         case SHMCTL:
 361                 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
 362                 break;
 363         default:
 364                 err = -EINVAL;
 365                 break;
 366         }
 367
 368         return err;
 369 }
 370
 371 #ifdef CONFIG_MIPS32_N32
 372 asmlinkage long sysn32_semctl(int semid, int semnum, int cmd, u32 arg)
 373 {
 374         /* compat_sys_semctl expects a pointer to union semun */
 375         u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
 376         if (put_user(arg, uptr))
 377                 return -EFAULT;
 378         return compat_sys_semctl(semid, semnum, cmd, uptr);
 379 }
 380
 381 asmlinkage long sysn32_msgsnd(int msqid, u32 msgp, unsigned msgsz, int msgflg)
 382 {
 383         return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 384 }
 385
 386 asmlinkage long sysn32_msgrcv(int msqid, u32 msgp, size_t msgsz, int msgtyp,
 387                               int msgflg)
 388 {
 389         return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
 390                                  compat_ptr(msgp));
 391 }
 392 #endif
 393
 394 struct sysctl_args32
 395 {
 396         compat_caddr_t name;
 397         int nlen;
 398         compat_caddr_t oldval;
 399         compat_caddr_t oldlenp;
 400         compat_caddr_t newval;
 401         compat_size_t newlen;
 402         unsigned int __unused[4];
 403 };
 404
 405 #ifdef CONFIG_SYSCTL_SYSCALL
 406
 407 asmlinkage long sys32_sysctl(struct sysctl_args32 __user *args)
 408 {
 409         struct sysctl_args32 tmp;
 410         int error;
 411         size_t oldlen;
 412         size_t __user *oldlenp = NULL;
 413         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 414
 415         if (copy_from_user(&tmp, args, sizeof(tmp)))
 416                 return -EFAULT;
 417
 418         if (tmp.oldval && tmp.oldlenp) {
 419                 /* Duh, this is ugly and might not work if sysctl_args
 420                    is in read-only memory, but do_sysctl does indirectly
 421                    a lot of uaccess in both directions and we'd have to
 422                    basically copy the whole sysctl.c here, and
 423                    glibc's __sysctl uses rw memory for the structure
 424                    anyway.  */
 425                 if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
 426                     put_user(oldlen, (size_t __user *)addr))
 427                         return -EFAULT;
 428                 oldlenp = (size_t __user *)addr;
 429         }
 430
 431         lock_kernel();
 432         error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
 433                           oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
 434         unlock_kernel();
 435         if (oldlenp) {
 436                 if (!error) {
 437                         if (get_user(oldlen, (size_t __user *)addr) ||
 438                             put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
 439                                 error = -EFAULT;
 440                 }
 441                 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
 442         }
 443         return error;
 444 }
 445
 446 #endif /* CONFIG_SYSCTL_SYSCALL */
 447
 448 asmlinkage long sys32_newuname(struct new_utsname __user * name)
 449 {
 450         int ret = 0;
 451
 452         down_read(&uts_sem);
 453         if (copy_to_user(name, utsname(), sizeof *name))
 454                 ret = -EFAULT;
 455         up_read(&uts_sem);
 456
 457         if (current->personality == PER_LINUX32 && !ret)
 458                 if (copy_to_user(name->machine, "mips\0\0\0", 8))
 459                         ret = -EFAULT;
 460
 461         return ret;
 462 }
 463
 464 asmlinkage int sys32_personality(unsigned long personality)
 465 {
 466         int ret;
 467         personality &= 0xffffffff;
 468         if (personality(current->personality) == PER_LINUX32 &&
 469             personality == PER_LINUX)
 470                 personality = PER_LINUX32;
 471         ret = sys_personality(personality);
 472         if (ret == PER_LINUX32)
 473                 ret = PER_LINUX;
 474         return ret;
 475 }
 476
 477 /* ustat compatibility */
 478 struct ustat32 {
 479         compat_daddr_t  f_tfree;
 480         compat_ino_t    f_tinode;
 481         char            f_fname[6];
 482         char            f_fpack[6];
 483 };
 484
 485 extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf);
 486
 487 asmlinkage int sys32_ustat(dev_t dev, struct ustat32 __user * ubuf32)
 488 {
 489         int err;
 490         struct ustat tmp;
 491         struct ustat32 tmp32;
 492         mm_segment_t old_fs = get_fs();
 493
 494         set_fs(KERNEL_DS);
 495         err = sys_ustat(dev, (struct ustat __user *)&tmp);
 496         set_fs (old_fs);
 497
 498         if (err)
 499                 goto out;
 500
 501         memset(&tmp32,0,sizeof(struct ustat32));
 502         tmp32.f_tfree = tmp.f_tfree;
 503         tmp32.f_tinode = tmp.f_tinode;
 504
 505         err = copy_to_user(ubuf32,&tmp32,sizeof(struct ustat32)) ? -EFAULT : 0;
 506
 507 out:
 508         return err;
 509 }
 510
 511 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
 512         s32 count)
 513 {
 514         mm_segment_t old_fs = get_fs();
 515         int ret;
 516         off_t of;
 517
 518         if (offset && get_user(of, offset))
 519                 return -EFAULT;
 520
 521         set_fs(KERNEL_DS);
 522         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 523         set_fs(old_fs);
 524
 525         if (offset && put_user(of, offset))
 526                 return -EFAULT;
 527
 528         return ret;
 529 }
 530
 531 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 532                                    size_t count)
 533 {
 534         return sys_readahead(fd, merge_64(a2, a3), count);
 535 }
 536
 537 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 538         unsigned long a2, unsigned long a3,
 539         unsigned long a4, unsigned long a5,
 540         int flags)
 541 {
 542         return sys_sync_file_range(fd,
 543                         merge_64(a2, a3), merge_64(a4, a5),
 544                         flags);
 545 }
 546
 547 save_static_function(sys32_clone);
 548 __attribute_used__ noinline static int
 549 _sys32_clone(nabi_no_regargs struct pt_regs regs)
 550 {
 551         unsigned long clone_flags;
 552         unsigned long newsp;
 553         int __user *parent_tidptr, *child_tidptr;
 554
 555         clone_flags = regs.regs[4];
 556         newsp = regs.regs[5];
 557         if (!newsp)
 558                 newsp = regs.regs[29];
 559         parent_tidptr = (int __user *) regs.regs[6];
 560
 561         /* Use __dummy4 instead of getting it off the stack, so that
 562            syscall() works.  */
 563         child_tidptr = (int __user *) __dummy4;
 564         return do_fork(clone_flags, newsp, &regs, 0,
 565                        parent_tidptr, child_tidptr);
 566 }