linux/arch/s390/kernel/compat_linux.c
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   1/*
   2 *  arch/s390x/kernel/linux32.c
   3 *
   4 *  S390 version
   5 *    Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7 *               Gerhard Tonn (ton@de.ibm.com)   
   8 *               Thomas Spatzier (tspat@de.ibm.com)
   9 *
  10 *  Conversion between 31bit and 64bit native syscalls.
  11 *
  12 * Heavily inspired by the 32-bit Sparc compat code which is 
  13 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  14 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
  15 *
  16 */
  17
  18
  19#include <linux/kernel.h>
  20#include <linux/sched.h>
  21#include <linux/fs.h> 
  22#include <linux/mm.h> 
  23#include <linux/file.h> 
  24#include <linux/signal.h>
  25#include <linux/resource.h>
  26#include <linux/times.h>
  27#include <linux/smp.h>
  28#include <linux/smp_lock.h>
  29#include <linux/sem.h>
  30#include <linux/msg.h>
  31#include <linux/shm.h>
  32#include <linux/slab.h>
  33#include <linux/uio.h>
  34#include <linux/nfs_fs.h>
  35#include <linux/quota.h>
  36#include <linux/module.h>
  37#include <linux/sunrpc/svc.h>
  38#include <linux/nfsd/nfsd.h>
  39#include <linux/nfsd/cache.h>
  40#include <linux/nfsd/xdr.h>
  41#include <linux/nfsd/syscall.h>
  42#include <linux/poll.h>
  43#include <linux/personality.h>
  44#include <linux/stat.h>
  45#include <linux/filter.h>
  46#include <linux/highmem.h>
  47#include <linux/highuid.h>
  48#include <linux/mman.h>
  49#include <linux/ipv6.h>
  50#include <linux/in.h>
  51#include <linux/icmpv6.h>
  52#include <linux/syscalls.h>
  53#include <linux/sysctl.h>
  54#include <linux/binfmts.h>
  55#include <linux/capability.h>
  56#include <linux/compat.h>
  57#include <linux/vfs.h>
  58#include <linux/ptrace.h>
  59#include <linux/fadvise.h>
  60#include <linux/ipc.h>
  61
  62#include <asm/types.h>
  63#include <asm/uaccess.h>
  64
  65#include <net/scm.h>
  66#include <net/sock.h>
  67
  68#include "compat_linux.h"
  69
  70long psw_user32_bits    = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  71                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  72                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  73long psw32_user_bits    = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
  74                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
  75                           PSW32_MASK_PSTATE);
  76 
  77/* For this source file, we want overflow handling. */
  78
  79#undef high2lowuid
  80#undef high2lowgid
  81#undef low2highuid
  82#undef low2highgid
  83#undef SET_UID16
  84#undef SET_GID16
  85#undef NEW_TO_OLD_UID
  86#undef NEW_TO_OLD_GID
  87#undef SET_OLDSTAT_UID
  88#undef SET_OLDSTAT_GID
  89#undef SET_STAT_UID
  90#undef SET_STAT_GID
  91
  92#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
  93#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
  94#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
  95#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
  96#define SET_UID16(var, uid)     var = high2lowuid(uid)
  97#define SET_GID16(var, gid)     var = high2lowgid(gid)
  98#define NEW_TO_OLD_UID(uid)     high2lowuid(uid)
  99#define NEW_TO_OLD_GID(gid)     high2lowgid(gid)
 100#define SET_OLDSTAT_UID(stat, uid)      (stat).st_uid = high2lowuid(uid)
 101#define SET_OLDSTAT_GID(stat, gid)      (stat).st_gid = high2lowgid(gid)
 102#define SET_STAT_UID(stat, uid)         (stat).st_uid = high2lowuid(uid)
 103#define SET_STAT_GID(stat, gid)         (stat).st_gid = high2lowgid(gid)
 104
 105asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
 106{
 107        return sys_chown(filename, low2highuid(user), low2highgid(group));
 108}
 109
 110asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
 111{
 112        return sys_lchown(filename, low2highuid(user), low2highgid(group));
 113}
 114
 115asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
 116{
 117        return sys_fchown(fd, low2highuid(user), low2highgid(group));
 118}
 119
 120asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
 121{
 122        return sys_setregid(low2highgid(rgid), low2highgid(egid));
 123}
 124
 125asmlinkage long sys32_setgid16(u16 gid)
 126{
 127        return sys_setgid((gid_t)gid);
 128}
 129
 130asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
 131{
 132        return sys_setreuid(low2highuid(ruid), low2highuid(euid));
 133}
 134
 135asmlinkage long sys32_setuid16(u16 uid)
 136{
 137        return sys_setuid((uid_t)uid);
 138}
 139
 140asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
 141{
 142        return sys_setresuid(low2highuid(ruid), low2highuid(euid),
 143                low2highuid(suid));
 144}
 145
 146asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
 147{
 148        int retval;
 149
 150        if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
 151            !(retval = put_user(high2lowuid(current->cred->euid), euid)))
 152                retval = put_user(high2lowuid(current->cred->suid), suid);
 153
 154        return retval;
 155}
 156
 157asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
 158{
 159        return sys_setresgid(low2highgid(rgid), low2highgid(egid),
 160                low2highgid(sgid));
 161}
 162
 163asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
 164{
 165        int retval;
 166
 167        if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
 168            !(retval = put_user(high2lowgid(current->cred->egid), egid)))
 169                retval = put_user(high2lowgid(current->cred->sgid), sgid);
 170
 171        return retval;
 172}
 173
 174asmlinkage long sys32_setfsuid16(u16 uid)
 175{
 176        return sys_setfsuid((uid_t)uid);
 177}
 178
 179asmlinkage long sys32_setfsgid16(u16 gid)
 180{
 181        return sys_setfsgid((gid_t)gid);
 182}
 183
 184static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
 185{
 186        int i;
 187        u16 group;
 188
 189        for (i = 0; i < group_info->ngroups; i++) {
 190                group = (u16)GROUP_AT(group_info, i);
 191                if (put_user(group, grouplist+i))
 192                        return -EFAULT;
 193        }
 194
 195        return 0;
 196}
 197
 198static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
 199{
 200        int i;
 201        u16 group;
 202
 203        for (i = 0; i < group_info->ngroups; i++) {
 204                if (get_user(group, grouplist+i))
 205                        return  -EFAULT;
 206                GROUP_AT(group_info, i) = (gid_t)group;
 207        }
 208
 209        return 0;
 210}
 211
 212asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
 213{
 214        int i;
 215
 216        if (gidsetsize < 0)
 217                return -EINVAL;
 218
 219        get_group_info(current->cred->group_info);
 220        i = current->cred->group_info->ngroups;
 221        if (gidsetsize) {
 222                if (i > gidsetsize) {
 223                        i = -EINVAL;
 224                        goto out;
 225                }
 226                if (groups16_to_user(grouplist, current->cred->group_info)) {
 227                        i = -EFAULT;
 228                        goto out;
 229                }
 230        }
 231out:
 232        put_group_info(current->cred->group_info);
 233        return i;
 234}
 235
 236asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
 237{
 238        struct group_info *group_info;
 239        int retval;
 240
 241        if (!capable(CAP_SETGID))
 242                return -EPERM;
 243        if ((unsigned)gidsetsize > NGROUPS_MAX)
 244                return -EINVAL;
 245
 246        group_info = groups_alloc(gidsetsize);
 247        if (!group_info)
 248                return -ENOMEM;
 249        retval = groups16_from_user(group_info, grouplist);
 250        if (retval) {
 251                put_group_info(group_info);
 252                return retval;
 253        }
 254
 255        retval = set_current_groups(group_info);
 256        put_group_info(group_info);
 257
 258        return retval;
 259}
 260
 261asmlinkage long sys32_getuid16(void)
 262{
 263        return high2lowuid(current->cred->uid);
 264}
 265
 266asmlinkage long sys32_geteuid16(void)
 267{
 268        return high2lowuid(current->cred->euid);
 269}
 270
 271asmlinkage long sys32_getgid16(void)
 272{
 273        return high2lowgid(current->cred->gid);
 274}
 275
 276asmlinkage long sys32_getegid16(void)
 277{
 278        return high2lowgid(current->cred->egid);
 279}
 280
 281/*
 282 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
 283 *
 284 * This is really horribly ugly.
 285 */
 286#ifdef CONFIG_SYSVIPC
 287asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
 288{
 289        if (call >> 16)         /* hack for backward compatibility */
 290                return -EINVAL;
 291
 292        call &= 0xffff;
 293
 294        switch (call) {
 295        case SEMTIMEDOP:
 296                return compat_sys_semtimedop(first, compat_ptr(ptr),
 297                                             second, compat_ptr(third));
 298        case SEMOP:
 299                /* struct sembuf is the same on 32 and 64bit :)) */
 300                return sys_semtimedop(first, compat_ptr(ptr),
 301                                      second, NULL);
 302        case SEMGET:
 303                return sys_semget(first, second, third);
 304        case SEMCTL:
 305                return compat_sys_semctl(first, second, third,
 306                                         compat_ptr(ptr));
 307        case MSGSND:
 308                return compat_sys_msgsnd(first, second, third,
 309                                         compat_ptr(ptr));
 310        case MSGRCV:
 311                return compat_sys_msgrcv(first, second, 0, third,
 312                                         0, compat_ptr(ptr));
 313        case MSGGET:
 314                return sys_msgget((key_t) first, second);
 315        case MSGCTL:
 316                return compat_sys_msgctl(first, second, compat_ptr(ptr));
 317        case SHMAT:
 318                return compat_sys_shmat(first, second, third,
 319                                        0, compat_ptr(ptr));
 320        case SHMDT:
 321                return sys_shmdt(compat_ptr(ptr));
 322        case SHMGET:
 323                return sys_shmget(first, (unsigned)second, third);
 324        case SHMCTL:
 325                return compat_sys_shmctl(first, second, compat_ptr(ptr));
 326        }
 327
 328        return -ENOSYS;
 329}
 330#endif
 331
 332asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
 333{
 334        if ((int)high < 0)
 335                return -EINVAL;
 336        else
 337                return sys_truncate(path, (high << 32) | low);
 338}
 339
 340asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
 341{
 342        if ((int)high < 0)
 343                return -EINVAL;
 344        else
 345                return sys_ftruncate(fd, (high << 32) | low);
 346}
 347
 348asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
 349                                struct compat_timespec __user *interval)
 350{
 351        struct timespec t;
 352        int ret;
 353        mm_segment_t old_fs = get_fs ();
 354        
 355        set_fs (KERNEL_DS);
 356        ret = sys_sched_rr_get_interval(pid,
 357                                        (struct timespec __force __user *) &t);
 358        set_fs (old_fs);
 359        if (put_compat_timespec(&t, interval))
 360                return -EFAULT;
 361        return ret;
 362}
 363
 364asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 365                        compat_sigset_t __user *oset, size_t sigsetsize)
 366{
 367        sigset_t s;
 368        compat_sigset_t s32;
 369        int ret;
 370        mm_segment_t old_fs = get_fs();
 371        
 372        if (set) {
 373                if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 374                        return -EFAULT;
 375                switch (_NSIG_WORDS) {
 376                case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
 377                case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
 378                case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
 379                case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 380                }
 381        }
 382        set_fs (KERNEL_DS);
 383        ret = sys_rt_sigprocmask(how,
 384                                 set ? (sigset_t __force __user *) &s : NULL,
 385                                 oset ? (sigset_t __force __user *) &s : NULL,
 386                                 sigsetsize);
 387        set_fs (old_fs);
 388        if (ret) return ret;
 389        if (oset) {
 390                switch (_NSIG_WORDS) {
 391                case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 392                case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 393                case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 394                case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 395                }
 396                if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 397                        return -EFAULT;
 398        }
 399        return 0;
 400}
 401
 402asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 403                                size_t sigsetsize)
 404{
 405        sigset_t s;
 406        compat_sigset_t s32;
 407        int ret;
 408        mm_segment_t old_fs = get_fs();
 409                
 410        set_fs (KERNEL_DS);
 411        ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
 412        set_fs (old_fs);
 413        if (!ret) {
 414                switch (_NSIG_WORDS) {
 415                case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 416                case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 417                case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 418                case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 419                }
 420                if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 421                        return -EFAULT;
 422        }
 423        return ret;
 424}
 425
 426asmlinkage long
 427sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
 428{
 429        siginfo_t info;
 430        int ret;
 431        mm_segment_t old_fs = get_fs();
 432        
 433        if (copy_siginfo_from_user32(&info, uinfo))
 434                return -EFAULT;
 435        set_fs (KERNEL_DS);
 436        ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
 437        set_fs (old_fs);
 438        return ret;
 439}
 440
 441/*
 442 * sys32_execve() executes a new program after the asm stub has set
 443 * things up for us.  This should basically do what I want it to.
 444 */
 445asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
 446                             compat_uptr_t __user *envp)
 447{
 448        struct pt_regs *regs = task_pt_regs(current);
 449        char *filename;
 450        long rc;
 451
 452        filename = getname(name);
 453        rc = PTR_ERR(filename);
 454        if (IS_ERR(filename))
 455                return rc;
 456        rc = compat_do_execve(filename, argv, envp, regs);
 457        if (rc)
 458                goto out;
 459        current->thread.fp_regs.fpc=0;
 460        asm volatile("sfpc %0,0" : : "d" (0));
 461        rc = regs->gprs[2];
 462out:
 463        putname(filename);
 464        return rc;
 465}
 466
 467asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
 468                                size_t count, u32 poshi, u32 poslo)
 469{
 470        if ((compat_ssize_t) count < 0)
 471                return -EINVAL;
 472        return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 473}
 474
 475asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
 476                                size_t count, u32 poshi, u32 poslo)
 477{
 478        if ((compat_ssize_t) count < 0)
 479                return -EINVAL;
 480        return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 481}
 482
 483asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
 484{
 485        return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
 486}
 487
 488asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
 489{
 490        mm_segment_t old_fs = get_fs();
 491        int ret;
 492        off_t of;
 493        
 494        if (offset && get_user(of, offset))
 495                return -EFAULT;
 496                
 497        set_fs(KERNEL_DS);
 498        ret = sys_sendfile(out_fd, in_fd,
 499                           offset ? (off_t __force __user *) &of : NULL, count);
 500        set_fs(old_fs);
 501        
 502        if (offset && put_user(of, offset))
 503                return -EFAULT;
 504                
 505        return ret;
 506}
 507
 508asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
 509                                compat_loff_t __user *offset, s32 count)
 510{
 511        mm_segment_t old_fs = get_fs();
 512        int ret;
 513        loff_t lof;
 514        
 515        if (offset && get_user(lof, offset))
 516                return -EFAULT;
 517                
 518        set_fs(KERNEL_DS);
 519        ret = sys_sendfile64(out_fd, in_fd,
 520                             offset ? (loff_t __force __user *) &lof : NULL,
 521                             count);
 522        set_fs(old_fs);
 523        
 524        if (offset && put_user(lof, offset))
 525                return -EFAULT;
 526                
 527        return ret;
 528}
 529
 530#ifdef CONFIG_SYSCTL_SYSCALL
 531struct __sysctl_args32 {
 532        u32 name;
 533        int nlen;
 534        u32 oldval;
 535        u32 oldlenp;
 536        u32 newval;
 537        u32 newlen;
 538        u32 __unused[4];
 539};
 540
 541asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 542{
 543        struct __sysctl_args32 tmp;
 544        int error;
 545        size_t oldlen;
 546        size_t __user *oldlenp = NULL;
 547        unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 548
 549        if (copy_from_user(&tmp, args, sizeof(tmp)))
 550                return -EFAULT;
 551
 552        if (tmp.oldval && tmp.oldlenp) {
 553                /* Duh, this is ugly and might not work if sysctl_args
 554                   is in read-only memory, but do_sysctl does indirectly
 555                   a lot of uaccess in both directions and we'd have to
 556                   basically copy the whole sysctl.c here, and
 557                   glibc's __sysctl uses rw memory for the structure
 558                   anyway.  */
 559                if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
 560                    put_user(oldlen, (size_t __user *)addr))
 561                        return -EFAULT;
 562                oldlenp = (size_t __user *)addr;
 563        }
 564
 565        lock_kernel();
 566        error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
 567                          oldlenp, compat_ptr(tmp.newval), tmp.newlen);
 568        unlock_kernel();
 569        if (oldlenp) {
 570                if (!error) {
 571                        if (get_user(oldlen, (size_t __user *)addr) ||
 572                            put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
 573                                error = -EFAULT;
 574                }
 575                if (copy_to_user(args->__unused, tmp.__unused,
 576                                 sizeof(tmp.__unused)))
 577                        error = -EFAULT;
 578        }
 579        return error;
 580}
 581#endif
 582
 583struct stat64_emu31 {
 584        unsigned long long  st_dev;
 585        unsigned int    __pad1;
 586#define STAT64_HAS_BROKEN_ST_INO        1
 587        u32             __st_ino;
 588        unsigned int    st_mode;
 589        unsigned int    st_nlink;
 590        u32             st_uid;
 591        u32             st_gid;
 592        unsigned long long  st_rdev;
 593        unsigned int    __pad3;
 594        long            st_size;
 595        u32             st_blksize;
 596        unsigned char   __pad4[4];
 597        u32             __pad5;     /* future possible st_blocks high bits */
 598        u32             st_blocks;  /* Number 512-byte blocks allocated. */
 599        u32             st_atime;
 600        u32             __pad6;
 601        u32             st_mtime;
 602        u32             __pad7;
 603        u32             st_ctime;
 604        u32             __pad8;     /* will be high 32 bits of ctime someday */
 605        unsigned long   st_ino;
 606};      
 607
 608static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 609{
 610        struct stat64_emu31 tmp;
 611
 612        memset(&tmp, 0, sizeof(tmp));
 613
 614        tmp.st_dev = huge_encode_dev(stat->dev);
 615        tmp.st_ino = stat->ino;
 616        tmp.__st_ino = (u32)stat->ino;
 617        tmp.st_mode = stat->mode;
 618        tmp.st_nlink = (unsigned int)stat->nlink;
 619        tmp.st_uid = stat->uid;
 620        tmp.st_gid = stat->gid;
 621        tmp.st_rdev = huge_encode_dev(stat->rdev);
 622        tmp.st_size = stat->size;
 623        tmp.st_blksize = (u32)stat->blksize;
 624        tmp.st_blocks = (u32)stat->blocks;
 625        tmp.st_atime = (u32)stat->atime.tv_sec;
 626        tmp.st_mtime = (u32)stat->mtime.tv_sec;
 627        tmp.st_ctime = (u32)stat->ctime.tv_sec;
 628
 629        return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
 630}
 631
 632asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
 633{
 634        struct kstat stat;
 635        int ret = vfs_stat(filename, &stat);
 636        if (!ret)
 637                ret = cp_stat64(statbuf, &stat);
 638        return ret;
 639}
 640
 641asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
 642{
 643        struct kstat stat;
 644        int ret = vfs_lstat(filename, &stat);
 645        if (!ret)
 646                ret = cp_stat64(statbuf, &stat);
 647        return ret;
 648}
 649
 650asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
 651{
 652        struct kstat stat;
 653        int ret = vfs_fstat(fd, &stat);
 654        if (!ret)
 655                ret = cp_stat64(statbuf, &stat);
 656        return ret;
 657}
 658
 659asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
 660                                struct stat64_emu31 __user* statbuf, int flag)
 661{
 662        struct kstat stat;
 663        int error;
 664
 665        error = vfs_fstatat(dfd, filename, &stat, flag);
 666        if (error)
 667                return error;
 668        return cp_stat64(statbuf, &stat);
 669}
 670
 671/*
 672 * Linux/i386 didn't use to be able to handle more than
 673 * 4 system call parameters, so these system calls used a memory
 674 * block for parameter passing..
 675 */
 676
 677struct mmap_arg_struct_emu31 {
 678        u32     addr;
 679        u32     len;
 680        u32     prot;
 681        u32     flags;
 682        u32     fd;
 683        u32     offset;
 684};
 685
 686/* common code for old and new mmaps */
 687static inline long do_mmap2(
 688        unsigned long addr, unsigned long len,
 689        unsigned long prot, unsigned long flags,
 690        unsigned long fd, unsigned long pgoff)
 691{
 692        struct file * file = NULL;
 693        unsigned long error = -EBADF;
 694
 695        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 696        if (!(flags & MAP_ANONYMOUS)) {
 697                file = fget(fd);
 698                if (!file)
 699                        goto out;
 700        }
 701
 702        down_write(&current->mm->mmap_sem);
 703        error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 704        if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
 705                /* Result is out of bounds.  */
 706                do_munmap(current->mm, addr, len);
 707                error = -ENOMEM;
 708        }
 709        up_write(&current->mm->mmap_sem);
 710
 711        if (file)
 712                fput(file);
 713out:    
 714        return error;
 715}
 716
 717
 718asmlinkage unsigned long
 719old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
 720{
 721        struct mmap_arg_struct_emu31 a;
 722        int error = -EFAULT;
 723
 724        if (copy_from_user(&a, arg, sizeof(a)))
 725                goto out;
 726
 727        error = -EINVAL;
 728        if (a.offset & ~PAGE_MASK)
 729                goto out;
 730
 731        error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); 
 732out:
 733        return error;
 734}
 735
 736asmlinkage long 
 737sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
 738{
 739        struct mmap_arg_struct_emu31 a;
 740        int error = -EFAULT;
 741
 742        if (copy_from_user(&a, arg, sizeof(a)))
 743                goto out;
 744        error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 745out:
 746        return error;
 747}
 748
 749asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
 750{
 751        if ((compat_ssize_t) count < 0)
 752                return -EINVAL; 
 753
 754        return sys_read(fd, buf, count);
 755}
 756
 757asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
 758{
 759        if ((compat_ssize_t) count < 0)
 760                return -EINVAL; 
 761
 762        return sys_write(fd, buf, count);
 763}
 764
 765/*
 766 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 767 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 768 * because the 31 bit values differ from the 64 bit values.
 769 */
 770
 771asmlinkage long
 772sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
 773{
 774        if (advise == 4)
 775                advise = POSIX_FADV_DONTNEED;
 776        else if (advise == 5)
 777                advise = POSIX_FADV_NOREUSE;
 778        return sys_fadvise64(fd, offset, len, advise);
 779}
 780
 781struct fadvise64_64_args {
 782        int fd;
 783        long long offset;
 784        long long len;
 785        int advice;
 786};
 787
 788asmlinkage long
 789sys32_fadvise64_64(struct fadvise64_64_args __user *args)
 790{
 791        struct fadvise64_64_args a;
 792
 793        if ( copy_from_user(&a, args, sizeof(a)) )
 794                return -EFAULT;
 795        if (a.advice == 4)
 796                a.advice = POSIX_FADV_DONTNEED;
 797        else if (a.advice == 5)
 798                a.advice = POSIX_FADV_NOREUSE;
 799        return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 800}
 801