linux/ipc/compat.c
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   1/*
   2 * 32 bit compatibility code for System V IPC
   3 *
   4 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   6 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7 * Copyright (C) 2000           VA Linux Co
   8 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   9 * Copyright (C) 2000           Hewlett-Packard Co.
  10 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11 * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
  12 * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
  13 * Copyright (C) 2000           Silicon Graphics, Inc.
  14 * Copyright (C) 2001           IBM
  15 * Copyright (C) 2004           IBM Deutschland Entwicklung GmbH, IBM Corporation
  16 * Copyright (C) 2004           Arnd Bergmann (arnd@arndb.de)
  17 *
  18 * This code is collected from the versions for sparc64, mips64, s390x, ia64,
  19 * ppc64 and x86_64, all of which are based on the original sparc64 version
  20 * by Jakub Jelinek.
  21 *
  22 */
  23#include <linux/compat.h>
  24#include <linux/errno.h>
  25#include <linux/highuid.h>
  26#include <linux/init.h>
  27#include <linux/msg.h>
  28#include <linux/shm.h>
  29#include <linux/slab.h>
  30#include <linux/syscalls.h>
  31
  32#include <linux/mutex.h>
  33#include <asm/uaccess.h>
  34
  35#include "util.h"
  36
  37struct compat_msgbuf {
  38        compat_long_t mtype;
  39        char mtext[1];
  40};
  41
  42struct compat_ipc_perm {
  43        key_t key;
  44        __compat_uid_t uid;
  45        __compat_gid_t gid;
  46        __compat_uid_t cuid;
  47        __compat_gid_t cgid;
  48        compat_mode_t mode;
  49        unsigned short seq;
  50};
  51
  52struct compat_semid_ds {
  53        struct compat_ipc_perm sem_perm;
  54        compat_time_t sem_otime;
  55        compat_time_t sem_ctime;
  56        compat_uptr_t sem_base;
  57        compat_uptr_t sem_pending;
  58        compat_uptr_t sem_pending_last;
  59        compat_uptr_t undo;
  60        unsigned short sem_nsems;
  61};
  62
  63struct compat_msqid_ds {
  64        struct compat_ipc_perm msg_perm;
  65        compat_uptr_t msg_first;
  66        compat_uptr_t msg_last;
  67        compat_time_t msg_stime;
  68        compat_time_t msg_rtime;
  69        compat_time_t msg_ctime;
  70        compat_ulong_t msg_lcbytes;
  71        compat_ulong_t msg_lqbytes;
  72        unsigned short msg_cbytes;
  73        unsigned short msg_qnum;
  74        unsigned short msg_qbytes;
  75        compat_ipc_pid_t msg_lspid;
  76        compat_ipc_pid_t msg_lrpid;
  77};
  78
  79struct compat_shmid_ds {
  80        struct compat_ipc_perm shm_perm;
  81        int shm_segsz;
  82        compat_time_t shm_atime;
  83        compat_time_t shm_dtime;
  84        compat_time_t shm_ctime;
  85        compat_ipc_pid_t shm_cpid;
  86        compat_ipc_pid_t shm_lpid;
  87        unsigned short shm_nattch;
  88        unsigned short shm_unused;
  89        compat_uptr_t shm_unused2;
  90        compat_uptr_t shm_unused3;
  91};
  92
  93struct compat_ipc_kludge {
  94        compat_uptr_t msgp;
  95        compat_long_t msgtyp;
  96};
  97
  98struct compat_shminfo64 {
  99        compat_ulong_t shmmax;
 100        compat_ulong_t shmmin;
 101        compat_ulong_t shmmni;
 102        compat_ulong_t shmseg;
 103        compat_ulong_t shmall;
 104        compat_ulong_t __unused1;
 105        compat_ulong_t __unused2;
 106        compat_ulong_t __unused3;
 107        compat_ulong_t __unused4;
 108};
 109
 110struct compat_shm_info {
 111        compat_int_t used_ids;
 112        compat_ulong_t shm_tot, shm_rss, shm_swp;
 113        compat_ulong_t swap_attempts, swap_successes;
 114};
 115
 116extern int sem_ctls[];
 117#define sc_semopm       (sem_ctls[2])
 118
 119static inline int compat_ipc_parse_version(int *cmd)
 120{
 121        int version = *cmd & IPC_64;
 122
 123        /* this is tricky: architectures that have support for the old
 124         * ipc structures in 64 bit binaries need to have IPC_64 set
 125         * in cmd, the others need to have it cleared */
 126#ifndef ipc_parse_version
 127        *cmd |= IPC_64;
 128#else
 129        *cmd &= ~IPC_64;
 130#endif
 131        return version;
 132}
 133
 134static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
 135                                          struct compat_ipc64_perm __user *up64)
 136{
 137        int err;
 138
 139        err  = __get_user(p64->uid, &up64->uid);
 140        err |= __get_user(p64->gid, &up64->gid);
 141        err |= __get_user(p64->mode, &up64->mode);
 142        return err;
 143}
 144
 145static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
 146                                        struct compat_ipc_perm __user *up)
 147{
 148        int err;
 149
 150        err  = __get_user(p->uid, &up->uid);
 151        err |= __get_user(p->gid, &up->gid);
 152        err |= __get_user(p->mode, &up->mode);
 153        return err;
 154}
 155
 156static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
 157                                          struct compat_ipc64_perm __user *up64)
 158{
 159        int err;
 160
 161        err  = __put_user(p64->key, &up64->key);
 162        err |= __put_user(p64->uid, &up64->uid);
 163        err |= __put_user(p64->gid, &up64->gid);
 164        err |= __put_user(p64->cuid, &up64->cuid);
 165        err |= __put_user(p64->cgid, &up64->cgid);
 166        err |= __put_user(p64->mode, &up64->mode);
 167        err |= __put_user(p64->seq, &up64->seq);
 168        return err;
 169}
 170
 171static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
 172                                        struct compat_ipc_perm __user *up)
 173{
 174        int err;
 175        __compat_uid_t u;
 176        __compat_gid_t g;
 177
 178        err  = __put_user(p->key, &up->key);
 179        SET_UID(u, p->uid);
 180        err |= __put_user(u, &up->uid);
 181        SET_GID(g, p->gid);
 182        err |= __put_user(g, &up->gid);
 183        SET_UID(u, p->cuid);
 184        err |= __put_user(u, &up->cuid);
 185        SET_GID(g, p->cgid);
 186        err |= __put_user(g, &up->cgid);
 187        err |= __put_user(p->mode, &up->mode);
 188        err |= __put_user(p->seq, &up->seq);
 189        return err;
 190}
 191
 192static inline int get_compat_semid64_ds(struct semid64_ds *s64,
 193                                        struct compat_semid64_ds __user *up64)
 194{
 195        if (!access_ok (VERIFY_READ, up64, sizeof(*up64)))
 196                return -EFAULT;
 197        return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 198}
 199
 200static inline int get_compat_semid_ds(struct semid64_ds *s,
 201                                      struct compat_semid_ds __user *up)
 202{
 203        if (!access_ok (VERIFY_READ, up, sizeof(*up)))
 204                return -EFAULT;
 205        return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 206}
 207
 208static inline int put_compat_semid64_ds(struct semid64_ds *s64,
 209                                        struct compat_semid64_ds __user *up64)
 210{
 211        int err;
 212
 213        if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64)))
 214                return -EFAULT;
 215        err  = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 216        err |= __put_user(s64->sem_otime, &up64->sem_otime);
 217        err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
 218        err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
 219        return err;
 220}
 221
 222static inline int put_compat_semid_ds(struct semid64_ds *s,
 223                                      struct compat_semid_ds __user *up)
 224{
 225        int err;
 226
 227        if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
 228                return -EFAULT;
 229        err  = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 230        err |= __put_user(s->sem_otime, &up->sem_otime);
 231        err |= __put_user(s->sem_ctime, &up->sem_ctime);
 232        err |= __put_user(s->sem_nsems, &up->sem_nsems);
 233        return err;
 234}
 235
 236long compat_sys_semctl(int first, int second, int third, void __user *uptr)
 237{
 238        union semun fourth;
 239        u32 pad;
 240        int err, err2;
 241        struct semid64_ds s64;
 242        struct semid64_ds __user *up64;
 243        int version = compat_ipc_parse_version(&third);
 244
 245        if (!uptr)
 246                return -EINVAL;
 247        if (get_user(pad, (u32 __user *) uptr))
 248                return -EFAULT;
 249        if ((third & (~IPC_64)) == SETVAL)
 250                fourth.val = (int) pad;
 251        else
 252                fourth.__pad = compat_ptr(pad);
 253        switch (third & (~IPC_64)) {
 254        case IPC_INFO:
 255        case IPC_RMID:
 256        case SEM_INFO:
 257        case GETVAL:
 258        case GETPID:
 259        case GETNCNT:
 260        case GETZCNT:
 261        case GETALL:
 262        case SETVAL:
 263        case SETALL:
 264                err = sys_semctl(first, second, third, fourth);
 265                break;
 266
 267        case IPC_STAT:
 268        case SEM_STAT:
 269                up64 = compat_alloc_user_space(sizeof(s64));
 270                fourth.__pad = up64;
 271                err = sys_semctl(first, second, third, fourth);
 272                if (err < 0)
 273                        break;
 274                if (copy_from_user(&s64, up64, sizeof(s64)))
 275                        err2 = -EFAULT;
 276                else if (version == IPC_64)
 277                        err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
 278                else
 279                        err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
 280                if (err2)
 281                        err = -EFAULT;
 282                break;
 283
 284        case IPC_SET:
 285                if (version == IPC_64) {
 286                        err = get_compat_semid64_ds(&s64, compat_ptr(pad));
 287                } else {
 288                        err = get_compat_semid_ds(&s64, compat_ptr(pad));
 289                }
 290                up64 = compat_alloc_user_space(sizeof(s64));
 291                if (copy_to_user(up64, &s64, sizeof(s64)))
 292                        err = -EFAULT;
 293                if (err)
 294                        break;
 295
 296                fourth.__pad = up64;
 297                err = sys_semctl(first, second, third, fourth);
 298                break;
 299
 300        default:
 301                err = -EINVAL;
 302                break;
 303        }
 304        return err;
 305}
 306
 307long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
 308{
 309        struct compat_msgbuf __user *up = uptr;
 310        long type;
 311
 312        if (first < 0)
 313                return -EINVAL;
 314        if (second < 0)
 315                return -EINVAL;
 316
 317        if (get_user(type, &up->mtype))
 318                return -EFAULT;
 319
 320        return do_msgsnd(first, type, up->mtext, second, third);
 321}
 322
 323long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
 324                           int version, void __user *uptr)
 325{
 326        struct compat_msgbuf __user *up;
 327        long type;
 328        int err;
 329
 330        if (first < 0)
 331                return -EINVAL;
 332        if (second < 0)
 333                return -EINVAL;
 334
 335        if (!version) {
 336                struct compat_ipc_kludge ipck;
 337                err = -EINVAL;
 338                if (!uptr)
 339                        goto out;
 340                err = -EFAULT;
 341                if (copy_from_user (&ipck, uptr, sizeof(ipck)))
 342                        goto out;
 343                uptr = compat_ptr(ipck.msgp);
 344                msgtyp = ipck.msgtyp;
 345        }
 346        up = uptr;
 347        err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
 348        if (err < 0)
 349                goto out;
 350        if (put_user(type, &up->mtype))
 351                err = -EFAULT;
 352out:
 353        return err;
 354}
 355
 356static inline int get_compat_msqid64(struct msqid64_ds *m64,
 357                                     struct compat_msqid64_ds __user *up64)
 358{
 359        int err;
 360
 361        if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 362                return -EFAULT;
 363        err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 364        err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
 365        return err;
 366}
 367
 368static inline int get_compat_msqid(struct msqid64_ds *m,
 369                                   struct compat_msqid_ds __user *up)
 370{
 371        int err;
 372
 373        if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 374                return -EFAULT;
 375        err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 376        err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
 377        return err;
 378}
 379
 380static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
 381                                 struct compat_msqid64_ds __user *up64)
 382{
 383        int err;
 384
 385        if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 386                return -EFAULT;
 387        err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 388        err |= __put_user(m64->msg_stime, &up64->msg_stime);
 389        err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
 390        err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
 391        err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
 392        err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
 393        err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
 394        err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
 395        err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
 396        return err;
 397}
 398
 399static inline int put_compat_msqid_ds(struct msqid64_ds *m,
 400                                      struct compat_msqid_ds __user *up)
 401{
 402        int err;
 403
 404        if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 405                return -EFAULT;
 406        err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 407        err |= __put_user(m->msg_stime, &up->msg_stime);
 408        err |= __put_user(m->msg_rtime, &up->msg_rtime);
 409        err |= __put_user(m->msg_ctime, &up->msg_ctime);
 410        err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
 411        err |= __put_user(m->msg_qnum, &up->msg_qnum);
 412        err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
 413        err |= __put_user(m->msg_lspid, &up->msg_lspid);
 414        err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
 415        return err;
 416}
 417
 418long compat_sys_msgctl(int first, int second, void __user *uptr)
 419{
 420        int err, err2;
 421        struct msqid64_ds m64;
 422        int version = compat_ipc_parse_version(&second);
 423        void __user *p;
 424
 425        switch (second & (~IPC_64)) {
 426        case IPC_INFO:
 427        case IPC_RMID:
 428        case MSG_INFO:
 429                err = sys_msgctl(first, second, uptr);
 430                break;
 431
 432        case IPC_SET:
 433                if (version == IPC_64) {
 434                        err = get_compat_msqid64(&m64, uptr);
 435                } else {
 436                        err = get_compat_msqid(&m64, uptr);
 437                }
 438                if (err)
 439                        break;
 440                p = compat_alloc_user_space(sizeof(m64));
 441                if (copy_to_user(p, &m64, sizeof(m64)))
 442                        err = -EFAULT;
 443                else
 444                        err = sys_msgctl(first, second, p);
 445                break;
 446
 447        case IPC_STAT:
 448        case MSG_STAT:
 449                p = compat_alloc_user_space(sizeof(m64));
 450                err = sys_msgctl(first, second, p);
 451                if (err < 0)
 452                        break;
 453                if (copy_from_user(&m64, p, sizeof(m64)))
 454                        err2 = -EFAULT;
 455                else if (version == IPC_64)
 456                        err2 = put_compat_msqid64_ds(&m64, uptr);
 457                else
 458                        err2 = put_compat_msqid_ds(&m64, uptr);
 459                if (err2)
 460                        err = -EFAULT;
 461                break;
 462
 463        default:
 464                err = -EINVAL;
 465                break;
 466        }
 467        return err;
 468}
 469
 470long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
 471                        void __user *uptr)
 472{
 473        int err;
 474        unsigned long raddr;
 475        compat_ulong_t __user *uaddr;
 476
 477        if (version == 1)
 478                return -EINVAL;
 479        err = do_shmat(first, uptr, second, &raddr);
 480        if (err < 0)
 481                return err;
 482        uaddr = compat_ptr(third);
 483        return put_user(raddr, uaddr);
 484}
 485
 486static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
 487                                        struct compat_shmid64_ds __user *up64)
 488{
 489        if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 490                return -EFAULT;
 491        return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 492}
 493
 494static inline int get_compat_shmid_ds(struct shmid64_ds *s,
 495                                      struct compat_shmid_ds __user *up)
 496{
 497        if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 498                return -EFAULT;
 499        return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 500}
 501
 502static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
 503                                        struct compat_shmid64_ds __user *up64)
 504{
 505        int err;
 506
 507        if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 508                return -EFAULT;
 509        err  = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 510        err |= __put_user(s64->shm_atime, &up64->shm_atime);
 511        err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
 512        err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
 513        err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
 514        err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
 515        err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
 516        err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
 517        return err;
 518}
 519
 520static inline int put_compat_shmid_ds(struct shmid64_ds *s,
 521                                      struct compat_shmid_ds __user *up)
 522{
 523        int err;
 524
 525        if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 526                return -EFAULT;
 527        err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 528        err |= __put_user(s->shm_atime, &up->shm_atime);
 529        err |= __put_user(s->shm_dtime, &up->shm_dtime);
 530        err |= __put_user(s->shm_ctime, &up->shm_ctime);
 531        err |= __put_user(s->shm_segsz, &up->shm_segsz);
 532        err |= __put_user(s->shm_nattch, &up->shm_nattch);
 533        err |= __put_user(s->shm_cpid, &up->shm_cpid);
 534        err |= __put_user(s->shm_lpid, &up->shm_lpid);
 535        return err;
 536}
 537
 538static inline int put_compat_shminfo64(struct shminfo64 *smi,
 539                                       struct compat_shminfo64 __user *up64)
 540{
 541        int err;
 542
 543        if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 544                return -EFAULT;
 545        if (smi->shmmax > INT_MAX)
 546                smi->shmmax = INT_MAX;
 547        err  = __put_user(smi->shmmax, &up64->shmmax);
 548        err |= __put_user(smi->shmmin, &up64->shmmin);
 549        err |= __put_user(smi->shmmni, &up64->shmmni);
 550        err |= __put_user(smi->shmseg, &up64->shmseg);
 551        err |= __put_user(smi->shmall, &up64->shmall);
 552        return err;
 553}
 554
 555static inline int put_compat_shminfo(struct shminfo64 *smi,
 556                                     struct shminfo __user *up)
 557{
 558        int err;
 559
 560        if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 561                return -EFAULT;
 562        if (smi->shmmax > INT_MAX)
 563                smi->shmmax = INT_MAX;
 564        err  = __put_user(smi->shmmax, &up->shmmax);
 565        err |= __put_user(smi->shmmin, &up->shmmin);
 566        err |= __put_user(smi->shmmni, &up->shmmni);
 567        err |= __put_user(smi->shmseg, &up->shmseg);
 568        err |= __put_user(smi->shmall, &up->shmall);
 569        return err;
 570}
 571
 572static inline int put_compat_shm_info(struct shm_info __user *ip,
 573                                      struct compat_shm_info __user *uip)
 574{
 575        int err;
 576        struct shm_info si;
 577
 578        if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
 579            copy_from_user(&si, ip, sizeof(si)))
 580                return -EFAULT;
 581        err  = __put_user(si.used_ids, &uip->used_ids);
 582        err |= __put_user(si.shm_tot, &uip->shm_tot);
 583        err |= __put_user(si.shm_rss, &uip->shm_rss);
 584        err |= __put_user(si.shm_swp, &uip->shm_swp);
 585        err |= __put_user(si.swap_attempts, &uip->swap_attempts);
 586        err |= __put_user(si.swap_successes, &uip->swap_successes);
 587        return err;
 588}
 589
 590long compat_sys_shmctl(int first, int second, void __user *uptr)
 591{
 592        void __user *p;
 593        struct shmid64_ds s64;
 594        struct shminfo64 smi;
 595        int err, err2;
 596        int version = compat_ipc_parse_version(&second);
 597
 598        switch (second & (~IPC_64)) {
 599        case IPC_RMID:
 600        case SHM_LOCK:
 601        case SHM_UNLOCK:
 602                err = sys_shmctl(first, second, uptr);
 603                break;
 604
 605        case IPC_INFO:
 606                p = compat_alloc_user_space(sizeof(smi));
 607                err = sys_shmctl(first, second, p);
 608                if (err < 0)
 609                        break;
 610                if (copy_from_user(&smi, p, sizeof(smi)))
 611                        err2 = -EFAULT;
 612                else if (version == IPC_64)
 613                        err2 = put_compat_shminfo64(&smi, uptr);
 614                else
 615                        err2 = put_compat_shminfo(&smi, uptr);
 616                if (err2)
 617                        err = -EFAULT;
 618                break;
 619
 620
 621        case IPC_SET:
 622                if (version == IPC_64) {
 623                        err = get_compat_shmid64_ds(&s64, uptr);
 624                } else {
 625                        err = get_compat_shmid_ds(&s64, uptr);
 626                }
 627                if (err)
 628                        break;
 629                p = compat_alloc_user_space(sizeof(s64));
 630                if (copy_to_user(p, &s64, sizeof(s64)))
 631                        err = -EFAULT;
 632                else
 633                        err = sys_shmctl(first, second, p);
 634                break;
 635
 636        case IPC_STAT:
 637        case SHM_STAT:
 638                p = compat_alloc_user_space(sizeof(s64));
 639                err = sys_shmctl(first, second, p);
 640                if (err < 0)
 641                        break;
 642                if (copy_from_user(&s64, p, sizeof(s64)))
 643                        err2 = -EFAULT;
 644                else if (version == IPC_64)
 645                        err2 = put_compat_shmid64_ds(&s64, uptr);
 646                else
 647                        err2 = put_compat_shmid_ds(&s64, uptr);
 648                if (err2)
 649                        err = -EFAULT;
 650                break;
 651
 652        case SHM_INFO:
 653                p = compat_alloc_user_space(sizeof(struct shm_info));
 654                err = sys_shmctl(first, second, p);
 655                if (err < 0)
 656                        break;
 657                err2 = put_compat_shm_info(p, uptr);
 658                if (err2)
 659                        err = -EFAULT;
 660                break;
 661
 662        default:
 663                err = -EINVAL;
 664                break;
 665        }
 666        return err;
 667}
 668
 669long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 670                unsigned nsops, const struct compat_timespec __user *timeout)
 671{
 672        struct timespec __user *ts64 = NULL;
 673        if (timeout) {
 674                struct timespec ts;
 675                ts64 = compat_alloc_user_space(sizeof(*ts64));
 676                if (get_compat_timespec(&ts, timeout))
 677                        return -EFAULT;
 678                if (copy_to_user(ts64, &ts, sizeof(ts)))
 679                        return -EFAULT;
 680        }
 681        return sys_semtimedop(semid, tsems, nsops, ts64);
 682}
 683