ipc/compat.c

   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/syscalls.h>
  30
  31 #include <linux/mutex.h>
  32 #include <asm/uaccess.h>
  33
  34 #include "util.h"
  35
  36 struct compat_msgbuf {
  37         compat_long_t mtype;
  38         char mtext[1];
  39 };
  40
  41 struct compat_ipc_perm {
  42         key_t key;
  43         __compat_uid_t uid;
  44         __compat_gid_t gid;
  45         __compat_uid_t cuid;
  46         __compat_gid_t cgid;
  47         compat_mode_t mode;
  48         unsigned short seq;
  49 };
  50
  51 struct compat_semid_ds {
  52         struct compat_ipc_perm sem_perm;
  53         compat_time_t sem_otime;
  54         compat_time_t sem_ctime;
  55         compat_uptr_t sem_base;
  56         compat_uptr_t sem_pending;
  57         compat_uptr_t sem_pending_last;
  58         compat_uptr_t undo;
  59         unsigned short sem_nsems;
  60 };
  61
  62 struct compat_msqid_ds {
  63         struct compat_ipc_perm msg_perm;
  64         compat_uptr_t msg_first;
  65         compat_uptr_t msg_last;
  66         compat_time_t msg_stime;
  67         compat_time_t msg_rtime;
  68         compat_time_t msg_ctime;
  69         compat_ulong_t msg_lcbytes;
  70         compat_ulong_t msg_lqbytes;
  71         unsigned short msg_cbytes;
  72         unsigned short msg_qnum;
  73         unsigned short msg_qbytes;
  74         compat_ipc_pid_t msg_lspid;
  75         compat_ipc_pid_t msg_lrpid;
  76 };
  77
  78 struct compat_shmid_ds {
  79         struct compat_ipc_perm shm_perm;
  80         int shm_segsz;
  81         compat_time_t shm_atime;
  82         compat_time_t shm_dtime;
  83         compat_time_t shm_ctime;
  84         compat_ipc_pid_t shm_cpid;
  85         compat_ipc_pid_t shm_lpid;
  86         unsigned short shm_nattch;
  87         unsigned short shm_unused;
  88         compat_uptr_t shm_unused2;
  89         compat_uptr_t shm_unused3;
  90 };
  91
  92 struct compat_ipc_kludge {
  93         compat_uptr_t msgp;
  94         compat_long_t msgtyp;
  95 };
  96
  97 struct compat_shminfo64 {
  98         compat_ulong_t shmmax;
  99         compat_ulong_t shmmin;
 100         compat_ulong_t shmmni;
 101         compat_ulong_t shmseg;
 102         compat_ulong_t shmall;
 103         compat_ulong_t __unused1;
 104         compat_ulong_t __unused2;
 105         compat_ulong_t __unused3;
 106         compat_ulong_t __unused4;
 107 };
 108
 109 struct compat_shm_info {
 110         compat_int_t used_ids;
 111         compat_ulong_t shm_tot, shm_rss, shm_swp;
 112         compat_ulong_t swap_attempts, swap_successes;
 113 };
 114
 115 extern int sem_ctls[];
 116 #define sc_semopm       (sem_ctls[2])
 117
 118 static inline int compat_ipc_parse_version(int *cmd)
 119 {
 120         int version = *cmd & IPC_64;
 121
 122         /* this is tricky: architectures that have support for the old
 123          * ipc structures in 64 bit binaries need to have IPC_64 set
 124          * in cmd, the others need to have it cleared */
 125 #ifndef ipc_parse_version
 126         *cmd |= IPC_64;
 127 #else
 128         *cmd &= ~IPC_64;
 129 #endif
 130         return version;
 131 }
 132
 133 static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
 134                                           struct compat_ipc64_perm __user *up64)
 135 {
 136         int err;
 137
 138         err  = __get_user(p64->uid, &up64->uid);
 139         err |= __get_user(p64->gid, &up64->gid);
 140         err |= __get_user(p64->mode, &up64->mode);
 141         return err;
 142 }
 143
 144 static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
 145                                         struct compat_ipc_perm __user *up)
 146 {
 147         int err;
 148
 149         err  = __get_user(p->uid, &up->uid);
 150         err |= __get_user(p->gid, &up->gid);
 151         err |= __get_user(p->mode, &up->mode);
 152         return err;
 153 }
 154
 155 static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
 156                                           struct compat_ipc64_perm __user *up64)
 157 {
 158         int err;
 159
 160         err  = __put_user(p64->key, &up64->key);
 161         err |= __put_user(p64->uid, &up64->uid);
 162         err |= __put_user(p64->gid, &up64->gid);
 163         err |= __put_user(p64->cuid, &up64->cuid);
 164         err |= __put_user(p64->cgid, &up64->cgid);
 165         err |= __put_user(p64->mode, &up64->mode);
 166         err |= __put_user(p64->seq, &up64->seq);
 167         return err;
 168 }
 169
 170 static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
 171                                         struct compat_ipc_perm __user *up)
 172 {
 173         int err;
 174         __compat_uid_t u;
 175         __compat_gid_t g;
 176
 177         err  = __put_user(p->key, &up->key);
 178         SET_UID(u, p->uid);
 179         err |= __put_user(u, &up->uid);
 180         SET_GID(g, p->gid);
 181         err |= __put_user(g, &up->gid);
 182         SET_UID(u, p->cuid);
 183         err |= __put_user(u, &up->cuid);
 184         SET_GID(g, p->cgid);
 185         err |= __put_user(g, &up->cgid);
 186         err |= __put_user(p->mode, &up->mode);
 187         err |= __put_user(p->seq, &up->seq);
 188         return err;
 189 }
 190
 191 static inline int get_compat_semid64_ds(struct semid64_ds *s64,
 192                                         struct compat_semid64_ds __user *up64)
 193 {
 194         if (!access_ok (VERIFY_READ, up64, sizeof(*up64)))
 195                 return -EFAULT;
 196         return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 197 }
 198
 199 static inline int get_compat_semid_ds(struct semid64_ds *s,
 200                                       struct compat_semid_ds __user *up)
 201 {
 202         if (!access_ok (VERIFY_READ, up, sizeof(*up)))
 203                 return -EFAULT;
 204         return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 205 }
 206
 207 static inline int put_compat_semid64_ds(struct semid64_ds *s64,
 208                                         struct compat_semid64_ds __user *up64)
 209 {
 210         int err;
 211
 212         if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64)))
 213                 return -EFAULT;
 214         err  = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 215         err |= __put_user(s64->sem_otime, &up64->sem_otime);
 216         err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
 217         err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
 218         return err;
 219 }
 220
 221 static inline int put_compat_semid_ds(struct semid64_ds *s,
 222                                       struct compat_semid_ds __user *up)
 223 {
 224         int err;
 225
 226         if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
 227                 return -EFAULT;
 228         err  = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 229         err |= __put_user(s->sem_otime, &up->sem_otime);
 230         err |= __put_user(s->sem_ctime, &up->sem_ctime);
 231         err |= __put_user(s->sem_nsems, &up->sem_nsems);
 232         return err;
 233 }
 234
 235 long compat_sys_semctl(int first, int second, int third, void __user *uptr)
 236 {
 237         union semun fourth;
 238         u32 pad;
 239         int err, err2;
 240         struct semid64_ds s64;
 241         struct semid64_ds __user *up64;
 242         int version = compat_ipc_parse_version(&third);
 243
 244         memset(&s64, 0, sizeof(s64));
 245
 246         if (!uptr)
 247                 return -EINVAL;
 248         if (get_user(pad, (u32 __user *) uptr))
 249                 return -EFAULT;
 250         if ((third & (~IPC_64)) == SETVAL)
 251                 fourth.val = (int) pad;
 252         else
 253                 fourth.__pad = compat_ptr(pad);
 254         switch (third & (~IPC_64)) {
 255         case IPC_INFO:
 256         case IPC_RMID:
 257         case SEM_INFO:
 258         case GETVAL:
 259         case GETPID:
 260         case GETNCNT:
 261         case GETZCNT:
 262         case GETALL:
 263         case SETVAL:
 264         case SETALL:
 265                 err = sys_semctl(first, second, third, fourth);
 266                 break;
 267
 268         case IPC_STAT:
 269         case SEM_STAT:
 270                 up64 = compat_alloc_user_space(sizeof(s64));
 271                 fourth.__pad = up64;
 272                 err = sys_semctl(first, second, third, fourth);
 273                 if (err < 0)
 274                         break;
 275                 if (copy_from_user(&s64, up64, sizeof(s64)))
 276                         err2 = -EFAULT;
 277                 else if (version == IPC_64)
 278                         err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
 279                 else
 280                         err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
 281                 if (err2)
 282                         err = -EFAULT;
 283                 break;
 284
 285         case IPC_SET:
 286                 if (version == IPC_64) {
 287                         err = get_compat_semid64_ds(&s64, compat_ptr(pad));
 288                 } else {
 289                         err = get_compat_semid_ds(&s64, compat_ptr(pad));
 290                 }
 291                 up64 = compat_alloc_user_space(sizeof(s64));
 292                 if (copy_to_user(up64, &s64, sizeof(s64)))
 293                         err = -EFAULT;
 294                 if (err)
 295                         break;
 296
 297                 fourth.__pad = up64;
 298                 err = sys_semctl(first, second, third, fourth);
 299                 break;
 300
 301         default:
 302                 err = -EINVAL;
 303                 break;
 304         }
 305         return err;
 306 }
 307
 308 long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
 309 {
 310         struct compat_msgbuf __user *up = uptr;
 311         long type;
 312
 313         if (first < 0)
 314                 return -EINVAL;
 315         if (second < 0)
 316                 return -EINVAL;
 317
 318         if (get_user(type, &up->mtype))
 319                 return -EFAULT;
 320
 321         return do_msgsnd(first, type, up->mtext, second, third);
 322 }
 323
 324 long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
 325                            int version, void __user *uptr)
 326 {
 327         struct compat_msgbuf __user *up;
 328         long type;
 329         int err;
 330
 331         if (first < 0)
 332                 return -EINVAL;
 333         if (second < 0)
 334                 return -EINVAL;
 335
 336         if (!version) {
 337                 struct compat_ipc_kludge ipck;
 338                 err = -EINVAL;
 339                 if (!uptr)
 340                         goto out;
 341                 err = -EFAULT;
 342                 if (copy_from_user (&ipck, uptr, sizeof(ipck)))
 343                         goto out;
 344                 uptr = compat_ptr(ipck.msgp);
 345                 msgtyp = ipck.msgtyp;
 346         }
 347         up = uptr;
 348         err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
 349         if (err < 0)
 350                 goto out;
 351         if (put_user(type, &up->mtype))
 352                 err = -EFAULT;
 353 out:
 354         return err;
 355 }
 356
 357 static inline int get_compat_msqid64(struct msqid64_ds *m64,
 358                                      struct compat_msqid64_ds __user *up64)
 359 {
 360         int err;
 361
 362         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 363                 return -EFAULT;
 364         err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 365         err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
 366         return err;
 367 }
 368
 369 static inline int get_compat_msqid(struct msqid64_ds *m,
 370                                    struct compat_msqid_ds __user *up)
 371 {
 372         int err;
 373
 374         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 375                 return -EFAULT;
 376         err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 377         err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
 378         return err;
 379 }
 380
 381 static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
 382                                  struct compat_msqid64_ds __user *up64)
 383 {
 384         int err;
 385
 386         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 387                 return -EFAULT;
 388         err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 389         err |= __put_user(m64->msg_stime, &up64->msg_stime);
 390         err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
 391         err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
 392         err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
 393         err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
 394         err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
 395         err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
 396         err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
 397         return err;
 398 }
 399
 400 static inline int put_compat_msqid_ds(struct msqid64_ds *m,
 401                                       struct compat_msqid_ds __user *up)
 402 {
 403         int err;
 404
 405         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 406                 return -EFAULT;
 407         err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 408         err |= __put_user(m->msg_stime, &up->msg_stime);
 409         err |= __put_user(m->msg_rtime, &up->msg_rtime);
 410         err |= __put_user(m->msg_ctime, &up->msg_ctime);
 411         err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
 412         err |= __put_user(m->msg_qnum, &up->msg_qnum);
 413         err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
 414         err |= __put_user(m->msg_lspid, &up->msg_lspid);
 415         err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
 416         return err;
 417 }
 418
 419 long compat_sys_msgctl(int first, int second, void __user *uptr)
 420 {
 421         int err, err2;
 422         struct msqid64_ds m64;
 423         int version = compat_ipc_parse_version(&second);
 424         void __user *p;
 425
 426         memset(&m64, 0, sizeof(m64));
 427
 428         switch (second & (~IPC_64)) {
 429         case IPC_INFO:
 430         case IPC_RMID:
 431         case MSG_INFO:
 432                 err = sys_msgctl(first, second, uptr);
 433                 break;
 434
 435         case IPC_SET:
 436                 if (version == IPC_64) {
 437                         err = get_compat_msqid64(&m64, uptr);
 438                 } else {
 439                         err = get_compat_msqid(&m64, uptr);
 440                 }
 441                 if (err)
 442                         break;
 443                 p = compat_alloc_user_space(sizeof(m64));
 444                 if (copy_to_user(p, &m64, sizeof(m64)))
 445                         err = -EFAULT;
 446                 else
 447                         err = sys_msgctl(first, second, p);
 448                 break;
 449
 450         case IPC_STAT:
 451         case MSG_STAT:
 452                 p = compat_alloc_user_space(sizeof(m64));
 453                 err = sys_msgctl(first, second, p);
 454                 if (err < 0)
 455                         break;
 456                 if (copy_from_user(&m64, p, sizeof(m64)))
 457                         err2 = -EFAULT;
 458                 else if (version == IPC_64)
 459                         err2 = put_compat_msqid64_ds(&m64, uptr);
 460                 else
 461                         err2 = put_compat_msqid_ds(&m64, uptr);
 462                 if (err2)
 463                         err = -EFAULT;
 464                 break;
 465
 466         default:
 467                 err = -EINVAL;
 468                 break;
 469         }
 470         return err;
 471 }
 472
 473 long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
 474                         void __user *uptr)
 475 {
 476         int err;
 477         unsigned long raddr;
 478         compat_ulong_t __user *uaddr;
 479
 480         if (version == 1)
 481                 return -EINVAL;
 482         err = do_shmat(first, uptr, second, &raddr);
 483         if (err < 0)
 484                 return err;
 485         uaddr = compat_ptr(third);
 486         return put_user(raddr, uaddr);
 487 }
 488
 489 static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
 490                                         struct compat_shmid64_ds __user *up64)
 491 {
 492         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 493                 return -EFAULT;
 494         return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 495 }
 496
 497 static inline int get_compat_shmid_ds(struct shmid64_ds *s,
 498                                       struct compat_shmid_ds __user *up)
 499 {
 500         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 501                 return -EFAULT;
 502         return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 503 }
 504
 505 static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
 506                                         struct compat_shmid64_ds __user *up64)
 507 {
 508         int err;
 509
 510         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 511                 return -EFAULT;
 512         err  = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 513         err |= __put_user(s64->shm_atime, &up64->shm_atime);
 514         err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
 515         err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
 516         err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
 517         err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
 518         err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
 519         err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
 520         return err;
 521 }
 522
 523 static inline int put_compat_shmid_ds(struct shmid64_ds *s,
 524                                       struct compat_shmid_ds __user *up)
 525 {
 526         int err;
 527
 528         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 529                 return -EFAULT;
 530         err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 531         err |= __put_user(s->shm_atime, &up->shm_atime);
 532         err |= __put_user(s->shm_dtime, &up->shm_dtime);
 533         err |= __put_user(s->shm_ctime, &up->shm_ctime);
 534         err |= __put_user(s->shm_segsz, &up->shm_segsz);
 535         err |= __put_user(s->shm_nattch, &up->shm_nattch);
 536         err |= __put_user(s->shm_cpid, &up->shm_cpid);
 537         err |= __put_user(s->shm_lpid, &up->shm_lpid);
 538         return err;
 539 }
 540
 541 static inline int put_compat_shminfo64(struct shminfo64 *smi,
 542                                        struct compat_shminfo64 __user *up64)
 543 {
 544         int err;
 545
 546         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 547                 return -EFAULT;
 548         if (smi->shmmax > INT_MAX)
 549                 smi->shmmax = INT_MAX;
 550         err  = __put_user(smi->shmmax, &up64->shmmax);
 551         err |= __put_user(smi->shmmin, &up64->shmmin);
 552         err |= __put_user(smi->shmmni, &up64->shmmni);
 553         err |= __put_user(smi->shmseg, &up64->shmseg);
 554         err |= __put_user(smi->shmall, &up64->shmall);
 555         return err;
 556 }
 557
 558 static inline int put_compat_shminfo(struct shminfo64 *smi,
 559                                      struct shminfo __user *up)
 560 {
 561         int err;
 562
 563         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 564                 return -EFAULT;
 565         if (smi->shmmax > INT_MAX)
 566                 smi->shmmax = INT_MAX;
 567         err  = __put_user(smi->shmmax, &up->shmmax);
 568         err |= __put_user(smi->shmmin, &up->shmmin);
 569         err |= __put_user(smi->shmmni, &up->shmmni);
 570         err |= __put_user(smi->shmseg, &up->shmseg);
 571         err |= __put_user(smi->shmall, &up->shmall);
 572         return err;
 573 }
 574
 575 static inline int put_compat_shm_info(struct shm_info __user *ip,
 576                                       struct compat_shm_info __user *uip)
 577 {
 578         int err;
 579         struct shm_info si;
 580
 581         if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
 582             copy_from_user(&si, ip, sizeof(si)))
 583                 return -EFAULT;
 584         err  = __put_user(si.used_ids, &uip->used_ids);
 585         err |= __put_user(si.shm_tot, &uip->shm_tot);
 586         err |= __put_user(si.shm_rss, &uip->shm_rss);
 587         err |= __put_user(si.shm_swp, &uip->shm_swp);
 588         err |= __put_user(si.swap_attempts, &uip->swap_attempts);
 589         err |= __put_user(si.swap_successes, &uip->swap_successes);
 590         return err;
 591 }
 592
 593 long compat_sys_shmctl(int first, int second, void __user *uptr)
 594 {
 595         void __user *p;
 596         struct shmid64_ds s64;
 597         struct shminfo64 smi;
 598         int err, err2;
 599         int version = compat_ipc_parse_version(&second);
 600
 601         memset(&s64, 0, sizeof(s64));
 602
 603         switch (second & (~IPC_64)) {
 604         case IPC_RMID:
 605         case SHM_LOCK:
 606         case SHM_UNLOCK:
 607                 err = sys_shmctl(first, second, uptr);
 608                 break;
 609
 610         case IPC_INFO:
 611                 p = compat_alloc_user_space(sizeof(smi));
 612                 err = sys_shmctl(first, second, p);
 613                 if (err < 0)
 614                         break;
 615                 if (copy_from_user(&smi, p, sizeof(smi)))
 616                         err2 = -EFAULT;
 617                 else if (version == IPC_64)
 618                         err2 = put_compat_shminfo64(&smi, uptr);
 619                 else
 620                         err2 = put_compat_shminfo(&smi, uptr);
 621                 if (err2)
 622                         err = -EFAULT;
 623                 break;
 624
 625
 626         case IPC_SET:
 627                 if (version == IPC_64) {
 628                         err = get_compat_shmid64_ds(&s64, uptr);
 629                 } else {
 630                         err = get_compat_shmid_ds(&s64, uptr);
 631                 }
 632                 if (err)
 633                         break;
 634                 p = compat_alloc_user_space(sizeof(s64));
 635                 if (copy_to_user(p, &s64, sizeof(s64)))
 636                         err = -EFAULT;
 637                 else
 638                         err = sys_shmctl(first, second, p);
 639                 break;
 640
 641         case IPC_STAT:
 642         case SHM_STAT:
 643                 p = compat_alloc_user_space(sizeof(s64));
 644                 err = sys_shmctl(first, second, p);
 645                 if (err < 0)
 646                         break;
 647                 if (copy_from_user(&s64, p, sizeof(s64)))
 648                         err2 = -EFAULT;
 649                 else if (version == IPC_64)
 650                         err2 = put_compat_shmid64_ds(&s64, uptr);
 651                 else
 652                         err2 = put_compat_shmid_ds(&s64, uptr);
 653                 if (err2)
 654                         err = -EFAULT;
 655                 break;
 656
 657         case SHM_INFO:
 658                 p = compat_alloc_user_space(sizeof(struct shm_info));
 659                 err = sys_shmctl(first, second, p);
 660                 if (err < 0)
 661                         break;
 662                 err2 = put_compat_shm_info(p, uptr);
 663                 if (err2)
 664                         err = -EFAULT;
 665                 break;
 666
 667         default:
 668                 err = -EINVAL;
 669                 break;
 670         }
 671         return err;
 672 }
 673
 674 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 675                 unsigned nsops, const struct compat_timespec __user *timeout)
 676 {
 677         struct timespec __user *ts64 = NULL;
 678         if (timeout) {
 679                 struct timespec ts;
 680                 ts64 = compat_alloc_user_space(sizeof(*ts64));
 681                 if (get_compat_timespec(&ts, timeout))
 682                         return -EFAULT;
 683                 if (copy_to_user(ts64, &ts, sizeof(ts)))
 684                         return -EFAULT;
 685         }
 686         return sys_semtimedop(semid, tsems, nsops, ts64);
 687 }