arch/parisc/kernel/sys_parisc32.c

   1 /*
   2  * sys_parisc32.c: Conversion between 32bit and 64bit native syscalls.
   3  *
   4  * Copyright (C) 2000-2001 Hewlett Packard Company
   5  * Copyright (C) 2000 John Marvin
   6  * Copyright (C) 2001 Matthew Wilcox
   7  *
   8  * These routines maintain argument size conversion between 32bit and 64bit
   9  * environment. Based heavily on sys_ia32.c and sys_sparc32.c.
  10  */
  11
  12 #include <linux/compat.h>
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/fs.h>
  16 #include <linux/mm.h>
  17 #include <linux/file.h>
  18 #include <linux/signal.h>
  19 #include <linux/resource.h>
  20 #include <linux/times.h>
  21 #include <linux/utsname.h>
  22 #include <linux/time.h>
  23 #include <linux/smp.h>
  24 #include <linux/smp_lock.h>
  25 #include <linux/sem.h>
  26 #include <linux/msg.h>
  27 #include <linux/shm.h>
  28 #include <linux/slab.h>
  29 #include <linux/uio.h>
  30 #include <linux/nfs_fs.h>
  31 #include <linux/ncp_fs.h>
  32 #include <linux/sunrpc/svc.h>
  33 #include <linux/nfsd/nfsd.h>
  34 #include <linux/nfsd/cache.h>
  35 #include <linux/nfsd/xdr.h>
  36 #include <linux/nfsd/syscall.h>
  37 #include <linux/poll.h>
  38 #include <linux/personality.h>
  39 #include <linux/stat.h>
  40 #include <linux/highmem.h>
  41 #include <linux/highuid.h>
  42 #include <linux/mman.h>
  43 #include <linux/binfmts.h>
  44 #include <linux/namei.h>
  45 #include <linux/vfs.h>
  46 #include <linux/ptrace.h>
  47 #include <linux/swap.h>
  48 #include <linux/syscalls.h>
  49
  50 #include <asm/types.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/mmu_context.h>
  53
  54 #include "sys32.h"
  55
  56 #undef DEBUG
  57
  58 #ifdef DEBUG
  59 #define DBG(x)  printk x
  60 #else
  61 #define DBG(x)
  62 #endif
  63
  64 /*
  65  * sys32_execve() executes a new program.
  66  */
  67
  68 asmlinkage int sys32_execve(struct pt_regs *regs)
  69 {
  70         int error;
  71         char *filename;
  72
  73         DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
  74         filename = getname((const char __user *) regs->gr[26]);
  75         error = PTR_ERR(filename);
  76         if (IS_ERR(filename))
  77                 goto out;
  78         error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
  79                                  compat_ptr(regs->gr[24]), regs);
  80         if (error == 0) {
  81                 task_lock(current);
  82                 current->ptrace &= ~PT_DTRACE;
  83                 task_unlock(current);
  84         }
  85         putname(filename);
  86 out:
  87
  88         return error;
  89 }
  90
  91 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  92         int r22, int r21, int r20)
  93 {
  94     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  95         current->comm, current->pid, r20);
  96     return -ENOSYS;
  97 }
  98
  99 #ifdef CONFIG_SYSCTL
 100
 101 struct __sysctl_args32 {
 102         u32 name;
 103         int nlen;
 104         u32 oldval;
 105         u32 oldlenp;
 106         u32 newval;
 107         u32 newlen;
 108         u32 __unused[4];
 109 };
 110
 111 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 112 {
 113 #ifndef CONFIG_SYSCTL_SYSCALL
 114         return -ENOSYS;
 115 #else
 116         struct __sysctl_args32 tmp;
 117         int error;
 118         unsigned int oldlen32;
 119         size_t oldlen, __user *oldlenp = NULL;
 120         unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
 121
 122         DBG(("sysctl32(%p)\n", args));
 123
 124         if (copy_from_user(&tmp, args, sizeof(tmp)))
 125                 return -EFAULT;
 126
 127         if (tmp.oldval && tmp.oldlenp) {
 128                 /* Duh, this is ugly and might not work if sysctl_args
 129                    is in read-only memory, but do_sysctl does indirectly
 130                    a lot of uaccess in both directions and we'd have to
 131                    basically copy the whole sysctl.c here, and
 132                    glibc's __sysctl uses rw memory for the structure
 133                    anyway.  */
 134                 /* a possibly better hack than this, which will avoid the
 135                  * problem if the struct is read only, is to push the
 136                  * 'oldlen' value out to the user's stack instead. -PB
 137                  */
 138                 if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 139                         return -EFAULT;
 140                 oldlen = oldlen32;
 141                 if (put_user(oldlen, (size_t *)addr))
 142                         return -EFAULT;
 143                 oldlenp = (size_t *)addr;
 144         }
 145
 146         lock_kernel();
 147         error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
 148                           (void __user *)(u64)tmp.oldval, oldlenp,
 149                           (void __user *)(u64)tmp.newval, tmp.newlen);
 150         unlock_kernel();
 151         if (oldlenp) {
 152                 if (!error) {
 153                         if (get_user(oldlen, (size_t *)addr)) {
 154                                 error = -EFAULT;
 155                         } else {
 156                                 oldlen32 = oldlen;
 157                                 if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 158                                         error = -EFAULT;
 159                         }
 160                 }
 161                 if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
 162                         error = -EFAULT;
 163         }
 164         return error;
 165 #endif
 166 }
 167
 168 #endif /* CONFIG_SYSCTL */
 169
 170 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
 171         struct compat_timespec __user *interval)
 172 {
 173         struct timespec t;
 174         int ret;
 175
 176         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
 177         if (put_compat_timespec(&t, interval))
 178                 return -EFAULT;
 179         return ret;
 180 }
 181
 182 static int
 183 put_compat_timeval(struct compat_timeval __user *u, struct timeval *t)
 184 {
 185         struct compat_timeval t32;
 186         t32.tv_sec = t->tv_sec;
 187         t32.tv_usec = t->tv_usec;
 188         return copy_to_user(u, &t32, sizeof t32);
 189 }
 190
 191 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 192 {
 193         long usec;
 194
 195         if (__get_user(o->tv_sec, &i->tv_sec))
 196                 return -EFAULT;
 197         if (__get_user(usec, &i->tv_usec))
 198                 return -EFAULT;
 199         o->tv_nsec = usec * 1000;
 200         return 0;
 201 }
 202
 203 asmlinkage int
 204 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 205 {
 206     extern void do_gettimeofday(struct timeval *tv);
 207
 208     if (tv) {
 209             struct timeval ktv;
 210             do_gettimeofday(&ktv);
 211             if (put_compat_timeval(tv, &ktv))
 212                     return -EFAULT;
 213     }
 214     if (tz) {
 215             extern struct timezone sys_tz;
 216             if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 217                     return -EFAULT;
 218     }
 219     return 0;
 220 }
 221
 222 asmlinkage
 223 int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 224 {
 225         struct timespec kts;
 226         struct timezone ktz;
 227
 228         if (tv) {
 229                 if (get_ts32(&kts, tv))
 230                         return -EFAULT;
 231         }
 232         if (tz) {
 233                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 234                         return -EFAULT;
 235         }
 236
 237         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 238 }
 239
 240 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
 241 {
 242         compat_ino_t ino;
 243         int err;
 244
 245         if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
 246             !new_valid_dev(stat->rdev))
 247                 return -EOVERFLOW;
 248
 249         ino = stat->ino;
 250         if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
 251                 return -EOVERFLOW;
 252
 253         err  = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
 254         err |= put_user(ino, &statbuf->st_ino);
 255         err |= put_user(stat->mode, &statbuf->st_mode);
 256         err |= put_user(stat->nlink, &statbuf->st_nlink);
 257         err |= put_user(0, &statbuf->st_reserved1);
 258         err |= put_user(0, &statbuf->st_reserved2);
 259         err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
 260         err |= put_user(stat->size, &statbuf->st_size);
 261         err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
 262         err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
 263         err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
 264         err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
 265         err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
 266         err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
 267         err |= put_user(stat->blksize, &statbuf->st_blksize);
 268         err |= put_user(stat->blocks, &statbuf->st_blocks);
 269         err |= put_user(0, &statbuf->__unused1);
 270         err |= put_user(0, &statbuf->__unused2);
 271         err |= put_user(0, &statbuf->__unused3);
 272         err |= put_user(0, &statbuf->__unused4);
 273         err |= put_user(0, &statbuf->__unused5);
 274         err |= put_user(0, &statbuf->st_fstype); /* not avail */
 275         err |= put_user(0, &statbuf->st_realdev); /* not avail */
 276         err |= put_user(0, &statbuf->st_basemode); /* not avail */
 277         err |= put_user(0, &statbuf->st_spareshort);
 278         err |= put_user(stat->uid, &statbuf->st_uid);
 279         err |= put_user(stat->gid, &statbuf->st_gid);
 280         err |= put_user(0, &statbuf->st_spare4[0]);
 281         err |= put_user(0, &statbuf->st_spare4[1]);
 282         err |= put_user(0, &statbuf->st_spare4[2]);
 283
 284         return err;
 285 }
 286
 287 /*** copied from mips64 ***/
 288 /*
 289  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 290  * 64-bit unsigned longs.
 291  */
 292
 293 static inline int
 294 get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 295 {
 296         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 297         if (ufdset) {
 298                 unsigned long odd;
 299
 300                 if (!access_ok(VERIFY_WRITE, ufdset, n*sizeof(u32)))
 301                         return -EFAULT;
 302
 303                 odd = n & 1UL;
 304                 n &= ~1UL;
 305                 while (n) {
 306                         unsigned long h, l;
 307                         __get_user(l, ufdset);
 308                         __get_user(h, ufdset+1);
 309                         ufdset += 2;
 310                         *fdset++ = h << 32 | l;
 311                         n -= 2;
 312                 }
 313                 if (odd)
 314                         __get_user(*fdset, ufdset);
 315         } else {
 316                 /* Tricky, must clear full unsigned long in the
 317                  * kernel fdset at the end, this makes sure that
 318                  * actually happens.
 319                  */
 320                 memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
 321         }
 322         return 0;
 323 }
 324
 325 static inline void
 326 set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 327 {
 328         unsigned long odd;
 329         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 330
 331         if (!ufdset)
 332                 return;
 333
 334         odd = n & 1UL;
 335         n &= ~1UL;
 336         while (n) {
 337                 unsigned long h, l;
 338                 l = *fdset++;
 339                 h = l >> 32;
 340                 __put_user(l, ufdset);
 341                 __put_user(h, ufdset+1);
 342                 ufdset += 2;
 343                 n -= 2;
 344         }
 345         if (odd)
 346                 __put_user(*fdset, ufdset);
 347 }
 348
 349 struct msgbuf32 {
 350     int mtype;
 351     char mtext[1];
 352 };
 353
 354 asmlinkage long sys32_msgsnd(int msqid,
 355                                 struct msgbuf32 __user *umsgp32,
 356                                 size_t msgsz, int msgflg)
 357 {
 358         struct msgbuf *mb;
 359         struct msgbuf32 mb32;
 360         int err;
 361
 362         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 363                 return -ENOMEM;
 364
 365         err = get_user(mb32.mtype, &umsgp32->mtype);
 366         mb->mtype = mb32.mtype;
 367         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 368
 369         if (err)
 370                 err = -EFAULT;
 371         else
 372                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 373
 374         kfree(mb);
 375         return err;
 376 }
 377
 378 asmlinkage long sys32_msgrcv(int msqid,
 379                                 struct msgbuf32 __user *umsgp32,
 380                                 size_t msgsz, long msgtyp, int msgflg)
 381 {
 382         struct msgbuf *mb;
 383         struct msgbuf32 mb32;
 384         int err, len;
 385
 386         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 387                 return -ENOMEM;
 388
 389         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 390
 391         if (err >= 0) {
 392                 len = err;
 393                 mb32.mtype = mb->mtype;
 394                 err = put_user(mb32.mtype, &umsgp32->mtype);
 395                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 396                 if (err)
 397                         err = -EFAULT;
 398                 else
 399                         err = len;
 400         }
 401
 402         kfree(mb);
 403         return err;
 404 }
 405
 406 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 407 {
 408         mm_segment_t old_fs = get_fs();
 409         int ret;
 410         off_t of;
 411
 412         if (offset && get_user(of, offset))
 413                 return -EFAULT;
 414
 415         set_fs(KERNEL_DS);
 416         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 417         set_fs(old_fs);
 418
 419         if (offset && put_user(of, offset))
 420                 return -EFAULT;
 421
 422         return ret;
 423 }
 424
 425 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 426 {
 427         mm_segment_t old_fs = get_fs();
 428         int ret;
 429         loff_t lof;
 430
 431         if (offset && get_user(lof, offset))
 432                 return -EFAULT;
 433
 434         set_fs(KERNEL_DS);
 435         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 436         set_fs(old_fs);
 437
 438         if (offset && put_user(lof, offset))
 439                 return -EFAULT;
 440
 441         return ret;
 442 }
 443
 444
 445 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 446  * half of the argument has been zeroed by syscall.S.
 447  */
 448
 449 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 450 {
 451         return sys_lseek(fd, offset, origin);
 452 }
 453
 454 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 455 {
 456         union semun u;
 457
 458         if (cmd == SETVAL) {
 459                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 460                  * The int should be in the first 4, but our argument
 461                  * frobbing has left it in the last 4.
 462                  */
 463                 u.val = *((int *)&arg + 1);
 464                 return sys_semctl (semid, semnum, cmd, u);
 465         }
 466         return sys_semctl (semid, semnum, cmd, arg);
 467 }
 468
 469 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 470                           size_t len)
 471 {
 472         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 473                                   buf, len);
 474 }
 475
 476 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 477                                 u32 lenhi, u32 lenlo)
 478 {
 479         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 480                              ((loff_t)lenhi << 32) | lenlo);
 481 }