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/slab.h>
  30 #include <linux/syscalls.h>
  31
  32 #include <linux/mutex.h>
  33 #include <asm/uaccess.h>
  34
  35 #include "util.h"
  36
  37 struct compat_msgbuf {
  38         compat_long_t mtype;
  39         char mtext[1];
  40 };
  41
  42 struct 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
  52 struct 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
  63 struct 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
  79 struct 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
  93 struct compat_ipc_kludge {
  94         compat_uptr_t msgp;
  95         compat_long_t msgtyp;
  96 };
  97
  98 struct 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
 110 struct 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
 116 extern int sem_ctls[];
 117 #define sc_semopm       (sem_ctls[2])
 118
 119 static 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
 134 static 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
 145 static 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
 156 static 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
 171 static 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
 192 static 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
 200 static 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
 208 static 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
 222 static 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                 err = -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
 236 long 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
 307 long 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
 323 long 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;
 352 out:
 353         return err;
 354 }
 355
 356 static 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
 368 static 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
 380 static 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
 399 static 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
 418 long 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
 470 long 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
 486 static 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
 494 static 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
 502 static 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
 520 static 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
 538 static 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         err  = __put_user(smi->shmmax, &up64->shmmax);
 546         err |= __put_user(smi->shmmin, &up64->shmmin);
 547         err |= __put_user(smi->shmmni, &up64->shmmni);
 548         err |= __put_user(smi->shmseg, &up64->shmseg);
 549         err |= __put_user(smi->shmall, &up64->shmall);
 550         return err;
 551 }
 552
 553 static inline int put_compat_shminfo(struct shminfo64 *smi,
 554                                      struct shminfo __user *up)
 555 {
 556         int err;
 557
 558         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 559                 return -EFAULT;
 560         err  = __put_user(smi->shmmax, &up->shmmax);
 561         err |= __put_user(smi->shmmin, &up->shmmin);
 562         err |= __put_user(smi->shmmni, &up->shmmni);
 563         err |= __put_user(smi->shmseg, &up->shmseg);
 564         err |= __put_user(smi->shmall, &up->shmall);
 565         return err;
 566 }
 567
 568 static inline int put_compat_shm_info(struct shm_info __user *ip,
 569                                       struct compat_shm_info __user *uip)
 570 {
 571         int err;
 572         struct shm_info si;
 573
 574         if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
 575             copy_from_user(&si, ip, sizeof(si)))
 576                 return -EFAULT;
 577         err  = __put_user(si.used_ids, &uip->used_ids);
 578         err |= __put_user(si.shm_tot, &uip->shm_tot);
 579         err |= __put_user(si.shm_rss, &uip->shm_rss);
 580         err |= __put_user(si.shm_swp, &uip->shm_swp);
 581         err |= __put_user(si.swap_attempts, &uip->swap_attempts);
 582         err |= __put_user(si.swap_successes, &uip->swap_successes);
 583         return err;
 584 }
 585
 586 long compat_sys_shmctl(int first, int second, void __user *uptr)
 587 {
 588         void __user *p;
 589         struct shmid64_ds s64;
 590         struct shminfo64 smi;
 591         int err, err2;
 592         int version = compat_ipc_parse_version(&second);
 593
 594         switch (second & (~IPC_64)) {
 595         case IPC_RMID:
 596         case SHM_LOCK:
 597         case SHM_UNLOCK:
 598                 err = sys_shmctl(first, second, uptr);
 599                 break;
 600
 601         case IPC_INFO:
 602                 p = compat_alloc_user_space(sizeof(smi));
 603                 err = sys_shmctl(first, second, p);
 604                 if (err < 0)
 605                         break;
 606                 if (copy_from_user(&smi, p, sizeof(smi)))
 607                         err2 = -EFAULT;
 608                 else if (version == IPC_64)
 609                         err2 = put_compat_shminfo64(&smi, uptr);
 610                 else
 611                         err2 = put_compat_shminfo(&smi, uptr);
 612                 if (err2)
 613                         err = -EFAULT;
 614                 break;
 615
 616
 617         case IPC_SET:
 618                 if (version == IPC_64) {
 619                         err = get_compat_shmid64_ds(&s64, uptr);
 620                 } else {
 621                         err = get_compat_shmid_ds(&s64, uptr);
 622                 }
 623                 if (err)
 624                         break;
 625                 p = compat_alloc_user_space(sizeof(s64));
 626                 if (copy_to_user(p, &s64, sizeof(s64)))
 627                         err = -EFAULT;
 628                 else
 629                         err = sys_shmctl(first, second, p);
 630                 break;
 631
 632         case IPC_STAT:
 633         case SHM_STAT:
 634                 p = compat_alloc_user_space(sizeof(s64));
 635                 err = sys_shmctl(first, second, p);
 636                 if (err < 0)
 637                         break;
 638                 if (copy_from_user(&s64, p, sizeof(s64)))
 639                         err2 = -EFAULT;
 640                 else if (version == IPC_64)
 641                         err2 = put_compat_shmid64_ds(&s64, uptr);
 642                 else
 643                         err2 = put_compat_shmid_ds(&s64, uptr);
 644                 if (err2)
 645                         err = -EFAULT;
 646                 break;
 647
 648         case SHM_INFO:
 649                 p = compat_alloc_user_space(sizeof(struct shm_info));
 650                 err = sys_shmctl(first, second, p);
 651                 if (err < 0)
 652                         break;
 653                 err2 = put_compat_shm_info(p, uptr);
 654                 if (err2)
 655                         err = -EFAULT;
 656                 break;
 657
 658         default:
 659                 err = -EINVAL;
 660                 break;
 661         }
 662         return err;
 663 }
 664
 665 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 666                 unsigned nsops, const struct compat_timespec __user *timeout)
 667 {
 668         struct timespec __user *ts64 = NULL;
 669         if (timeout) {
 670                 struct timespec ts;
 671                 ts64 = compat_alloc_user_space(sizeof(*ts64));
 672                 if (get_compat_timespec(&ts, timeout))
 673                         return -EFAULT;
 674                 if (copy_to_user(ts64, &ts, sizeof(ts)))
 675                         return -EFAULT;
 676         }
 677         return sys_semtimedop(semid, tsems, nsops, ts64);
 678 }