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/semaphore.h>
  53 #include <asm/mmu_context.h>
  54
  55 #include "sys32.h"
  56
  57 #undef DEBUG
  58
  59 #ifdef DEBUG
  60 #define DBG(x)  printk x
  61 #else
  62 #define DBG(x)
  63 #endif
  64
  65 /*
  66  * sys32_execve() executes a new program.
  67  */
  68
  69 asmlinkage int sys32_execve(struct pt_regs *regs)
  70 {
  71         int error;
  72         char *filename;
  73
  74         DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
  75         filename = getname((const char __user *) regs->gr[26]);
  76         error = PTR_ERR(filename);
  77         if (IS_ERR(filename))
  78                 goto out;
  79         error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
  80                                  compat_ptr(regs->gr[24]), regs);
  81         if (error == 0) {
  82                 task_lock(current);
  83                 current->ptrace &= ~PT_DTRACE;
  84                 task_unlock(current);
  85         }
  86         putname(filename);
  87 out:
  88
  89         return error;
  90 }
  91
  92 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  93         int r22, int r21, int r20)
  94 {
  95     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  96         current->comm, current->pid, r20);
  97     return -ENOSYS;
  98 }
  99
 100 #ifdef CONFIG_SYSCTL
 101
 102 struct __sysctl_args32 {
 103         u32 name;
 104         int nlen;
 105         u32 oldval;
 106         u32 oldlenp;
 107         u32 newval;
 108         u32 newlen;
 109         u32 __unused[4];
 110 };
 111
 112 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 113 {
 114 #ifndef CONFIG_SYSCTL_SYSCALL
 115         return -ENOSYS;
 116 #else
 117         struct __sysctl_args32 tmp;
 118         int error;
 119         unsigned int oldlen32;
 120         size_t oldlen, __user *oldlenp = NULL;
 121         unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
 122
 123         DBG(("sysctl32(%p)\n", args));
 124
 125         if (copy_from_user(&tmp, args, sizeof(tmp)))
 126                 return -EFAULT;
 127
 128         if (tmp.oldval && tmp.oldlenp) {
 129                 /* Duh, this is ugly and might not work if sysctl_args
 130                    is in read-only memory, but do_sysctl does indirectly
 131                    a lot of uaccess in both directions and we'd have to
 132                    basically copy the whole sysctl.c here, and
 133                    glibc's __sysctl uses rw memory for the structure
 134                    anyway.  */
 135                 /* a possibly better hack than this, which will avoid the
 136                  * problem if the struct is read only, is to push the
 137                  * 'oldlen' value out to the user's stack instead. -PB
 138                  */
 139                 if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 140                         return -EFAULT;
 141                 oldlen = oldlen32;
 142                 if (put_user(oldlen, (size_t *)addr))
 143                         return -EFAULT;
 144                 oldlenp = (size_t *)addr;
 145         }
 146
 147         lock_kernel();
 148         error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
 149                           (void __user *)(u64)tmp.oldval, oldlenp,
 150                           (void __user *)(u64)tmp.newval, tmp.newlen);
 151         unlock_kernel();
 152         if (oldlenp) {
 153                 if (!error) {
 154                         if (get_user(oldlen, (size_t *)addr)) {
 155                                 error = -EFAULT;
 156                         } else {
 157                                 oldlen32 = oldlen;
 158                                 if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 159                                         error = -EFAULT;
 160                         }
 161                 }
 162                 if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
 163                         error = -EFAULT;
 164         }
 165         return error;
 166 #endif
 167 }
 168
 169 #endif /* CONFIG_SYSCTL */
 170
 171 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
 172         struct compat_timespec __user *interval)
 173 {
 174         struct timespec t;
 175         int ret;
 176
 177         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
 178         if (put_compat_timespec(&t, interval))
 179                 return -EFAULT;
 180         return ret;
 181 }
 182
 183 static int
 184 put_compat_timeval(struct compat_timeval __user *u, struct timeval *t)
 185 {
 186         struct compat_timeval t32;
 187         t32.tv_sec = t->tv_sec;
 188         t32.tv_usec = t->tv_usec;
 189         return copy_to_user(u, &t32, sizeof t32);
 190 }
 191
 192 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 193 {
 194         long usec;
 195
 196         if (__get_user(o->tv_sec, &i->tv_sec))
 197                 return -EFAULT;
 198         if (__get_user(usec, &i->tv_usec))
 199                 return -EFAULT;
 200         o->tv_nsec = usec * 1000;
 201         return 0;
 202 }
 203
 204 asmlinkage int
 205 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 206 {
 207     extern void do_gettimeofday(struct timeval *tv);
 208
 209     if (tv) {
 210             struct timeval ktv;
 211             do_gettimeofday(&ktv);
 212             if (put_compat_timeval(tv, &ktv))
 213                     return -EFAULT;
 214     }
 215     if (tz) {
 216             extern struct timezone sys_tz;
 217             if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 218                     return -EFAULT;
 219     }
 220     return 0;
 221 }
 222
 223 asmlinkage
 224 int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 225 {
 226         struct timespec kts;
 227         struct timezone ktz;
 228
 229         if (tv) {
 230                 if (get_ts32(&kts, tv))
 231                         return -EFAULT;
 232         }
 233         if (tz) {
 234                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 235                         return -EFAULT;
 236         }
 237
 238         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 239 }
 240
 241 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
 242 {
 243         compat_ino_t ino;
 244         int err;
 245
 246         if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
 247             !new_valid_dev(stat->rdev))
 248                 return -EOVERFLOW;
 249
 250         ino = stat->ino;
 251         if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
 252                 return -EOVERFLOW;
 253
 254         err  = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
 255         err |= put_user(ino, &statbuf->st_ino);
 256         err |= put_user(stat->mode, &statbuf->st_mode);
 257         err |= put_user(stat->nlink, &statbuf->st_nlink);
 258         err |= put_user(0, &statbuf->st_reserved1);
 259         err |= put_user(0, &statbuf->st_reserved2);
 260         err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
 261         err |= put_user(stat->size, &statbuf->st_size);
 262         err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
 263         err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
 264         err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
 265         err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
 266         err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
 267         err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
 268         err |= put_user(stat->blksize, &statbuf->st_blksize);
 269         err |= put_user(stat->blocks, &statbuf->st_blocks);
 270         err |= put_user(0, &statbuf->__unused1);
 271         err |= put_user(0, &statbuf->__unused2);
 272         err |= put_user(0, &statbuf->__unused3);
 273         err |= put_user(0, &statbuf->__unused4);
 274         err |= put_user(0, &statbuf->__unused5);
 275         err |= put_user(0, &statbuf->st_fstype); /* not avail */
 276         err |= put_user(0, &statbuf->st_realdev); /* not avail */
 277         err |= put_user(0, &statbuf->st_basemode); /* not avail */
 278         err |= put_user(0, &statbuf->st_spareshort);
 279         err |= put_user(stat->uid, &statbuf->st_uid);
 280         err |= put_user(stat->gid, &statbuf->st_gid);
 281         err |= put_user(0, &statbuf->st_spare4[0]);
 282         err |= put_user(0, &statbuf->st_spare4[1]);
 283         err |= put_user(0, &statbuf->st_spare4[2]);
 284
 285         return err;
 286 }
 287
 288 /*** copied from mips64 ***/
 289 /*
 290  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 291  * 64-bit unsigned longs.
 292  */
 293
 294 static inline int
 295 get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 296 {
 297         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 298         if (ufdset) {
 299                 unsigned long odd;
 300
 301                 if (!access_ok(VERIFY_WRITE, ufdset, n*sizeof(u32)))
 302                         return -EFAULT;
 303
 304                 odd = n & 1UL;
 305                 n &= ~1UL;
 306                 while (n) {
 307                         unsigned long h, l;
 308                         __get_user(l, ufdset);
 309                         __get_user(h, ufdset+1);
 310                         ufdset += 2;
 311                         *fdset++ = h << 32 | l;
 312                         n -= 2;
 313                 }
 314                 if (odd)
 315                         __get_user(*fdset, ufdset);
 316         } else {
 317                 /* Tricky, must clear full unsigned long in the
 318                  * kernel fdset at the end, this makes sure that
 319                  * actually happens.
 320                  */
 321                 memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
 322         }
 323         return 0;
 324 }
 325
 326 static inline void
 327 set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 328 {
 329         unsigned long odd;
 330         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 331
 332         if (!ufdset)
 333                 return;
 334
 335         odd = n & 1UL;
 336         n &= ~1UL;
 337         while (n) {
 338                 unsigned long h, l;
 339                 l = *fdset++;
 340                 h = l >> 32;
 341                 __put_user(l, ufdset);
 342                 __put_user(h, ufdset+1);
 343                 ufdset += 2;
 344                 n -= 2;
 345         }
 346         if (odd)
 347                 __put_user(*fdset, ufdset);
 348 }
 349
 350 struct msgbuf32 {
 351     int mtype;
 352     char mtext[1];
 353 };
 354
 355 asmlinkage long sys32_msgsnd(int msqid,
 356                                 struct msgbuf32 __user *umsgp32,
 357                                 size_t msgsz, int msgflg)
 358 {
 359         struct msgbuf *mb;
 360         struct msgbuf32 mb32;
 361         int err;
 362
 363         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 364                 return -ENOMEM;
 365
 366         err = get_user(mb32.mtype, &umsgp32->mtype);
 367         mb->mtype = mb32.mtype;
 368         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 369
 370         if (err)
 371                 err = -EFAULT;
 372         else
 373                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 374
 375         kfree(mb);
 376         return err;
 377 }
 378
 379 asmlinkage long sys32_msgrcv(int msqid,
 380                                 struct msgbuf32 __user *umsgp32,
 381                                 size_t msgsz, long msgtyp, int msgflg)
 382 {
 383         struct msgbuf *mb;
 384         struct msgbuf32 mb32;
 385         int err, len;
 386
 387         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 388                 return -ENOMEM;
 389
 390         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 391
 392         if (err >= 0) {
 393                 len = err;
 394                 mb32.mtype = mb->mtype;
 395                 err = put_user(mb32.mtype, &umsgp32->mtype);
 396                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 397                 if (err)
 398                         err = -EFAULT;
 399                 else
 400                         err = len;
 401         }
 402
 403         kfree(mb);
 404         return err;
 405 }
 406
 407 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 408 {
 409         mm_segment_t old_fs = get_fs();
 410         int ret;
 411         off_t of;
 412
 413         if (offset && get_user(of, offset))
 414                 return -EFAULT;
 415
 416         set_fs(KERNEL_DS);
 417         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 418         set_fs(old_fs);
 419
 420         if (offset && put_user(of, offset))
 421                 return -EFAULT;
 422
 423         return ret;
 424 }
 425
 426 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 427 {
 428         mm_segment_t old_fs = get_fs();
 429         int ret;
 430         loff_t lof;
 431
 432         if (offset && get_user(lof, offset))
 433                 return -EFAULT;
 434
 435         set_fs(KERNEL_DS);
 436         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 437         set_fs(old_fs);
 438
 439         if (offset && put_user(lof, offset))
 440                 return -EFAULT;
 441
 442         return ret;
 443 }
 444
 445
 446 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 447  * half of the argument has been zeroed by syscall.S.
 448  */
 449
 450 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 451 {
 452         return sys_lseek(fd, offset, origin);
 453 }
 454
 455 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 456 {
 457         union semun u;
 458
 459         if (cmd == SETVAL) {
 460                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 461                  * The int should be in the first 4, but our argument
 462                  * frobbing has left it in the last 4.
 463                  */
 464                 u.val = *((int *)&arg + 1);
 465                 return sys_semctl (semid, semnum, cmd, u);
 466         }
 467         return sys_semctl (semid, semnum, cmd, arg);
 468 }
 469
 470 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 471                           size_t len)
 472 {
 473         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 474                                   buf, len);
 475 }
 476
 477 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 478                                 u32 lenhi, u32 lenlo)
 479 {
 480         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 481                              ((loff_t)lenhi << 32) | lenlo);
 482 }