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         if (!uptr)
 245                 return -EINVAL;
 246         if (get_user(pad, (u32 __user *) uptr))
 247                 return -EFAULT;
 248         if ((third & (~IPC_64)) == SETVAL)
 249                 fourth.val = (int) pad;
 250         else
 251                 fourth.__pad = compat_ptr(pad);
 252         switch (third & (~IPC_64)) {
 253         case IPC_INFO:
 254         case IPC_RMID:
 255         case SEM_INFO:
 256         case GETVAL:
 257         case GETPID:
 258         case GETNCNT:
 259         case GETZCNT:
 260         case GETALL:
 261         case SETVAL:
 262         case SETALL:
 263                 err = sys_semctl(first, second, third, fourth);
 264                 break;
 265
 266         case IPC_STAT:
 267         case SEM_STAT:
 268                 up64 = compat_alloc_user_space(sizeof(s64));
 269                 fourth.__pad = up64;
 270                 err = sys_semctl(first, second, third, fourth);
 271                 if (err < 0)
 272                         break;
 273                 if (copy_from_user(&s64, up64, sizeof(s64)))
 274                         err2 = -EFAULT;
 275                 else if (version == IPC_64)
 276                         err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
 277                 else
 278                         err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
 279                 if (err2)
 280                         err = -EFAULT;
 281                 break;
 282
 283         case IPC_SET:
 284                 if (version == IPC_64) {
 285                         err = get_compat_semid64_ds(&s64, compat_ptr(pad));
 286                 } else {
 287                         err = get_compat_semid_ds(&s64, compat_ptr(pad));
 288                 }
 289                 up64 = compat_alloc_user_space(sizeof(s64));
 290                 if (copy_to_user(up64, &s64, sizeof(s64)))
 291                         err = -EFAULT;
 292                 if (err)
 293                         break;
 294
 295                 fourth.__pad = up64;
 296                 err = sys_semctl(first, second, third, fourth);
 297                 break;
 298
 299         default:
 300                 err = -EINVAL;
 301                 break;
 302         }
 303         return err;
 304 }
 305
 306 long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
 307 {
 308         struct compat_msgbuf __user *up = uptr;
 309         long type;
 310
 311         if (first < 0)
 312                 return -EINVAL;
 313         if (second < 0)
 314                 return -EINVAL;
 315
 316         if (get_user(type, &up->mtype))
 317                 return -EFAULT;
 318
 319         return do_msgsnd(first, type, up->mtext, second, third);
 320 }
 321
 322 long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
 323                            int version, void __user *uptr)
 324 {
 325         struct compat_msgbuf __user *up;
 326         long type;
 327         int err;
 328
 329         if (first < 0)
 330                 return -EINVAL;
 331         if (second < 0)
 332                 return -EINVAL;
 333
 334         if (!version) {
 335                 struct compat_ipc_kludge ipck;
 336                 err = -EINVAL;
 337                 if (!uptr)
 338                         goto out;
 339                 err = -EFAULT;
 340                 if (copy_from_user (&ipck, uptr, sizeof(ipck)))
 341                         goto out;
 342                 uptr = compat_ptr(ipck.msgp);
 343                 msgtyp = ipck.msgtyp;
 344         }
 345         up = uptr;
 346         err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
 347         if (err < 0)
 348                 goto out;
 349         if (put_user(type, &up->mtype))
 350                 err = -EFAULT;
 351 out:
 352         return err;
 353 }
 354
 355 static inline int get_compat_msqid64(struct msqid64_ds *m64,
 356                                      struct compat_msqid64_ds __user *up64)
 357 {
 358         int err;
 359
 360         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 361                 return -EFAULT;
 362         err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 363         err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
 364         return err;
 365 }
 366
 367 static inline int get_compat_msqid(struct msqid64_ds *m,
 368                                    struct compat_msqid_ds __user *up)
 369 {
 370         int err;
 371
 372         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 373                 return -EFAULT;
 374         err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 375         err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
 376         return err;
 377 }
 378
 379 static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
 380                                  struct compat_msqid64_ds __user *up64)
 381 {
 382         int err;
 383
 384         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 385                 return -EFAULT;
 386         err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 387         err |= __put_user(m64->msg_stime, &up64->msg_stime);
 388         err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
 389         err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
 390         err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
 391         err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
 392         err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
 393         err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
 394         err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
 395         return err;
 396 }
 397
 398 static inline int put_compat_msqid_ds(struct msqid64_ds *m,
 399                                       struct compat_msqid_ds __user *up)
 400 {
 401         int err;
 402
 403         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 404                 return -EFAULT;
 405         err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 406         err |= __put_user(m->msg_stime, &up->msg_stime);
 407         err |= __put_user(m->msg_rtime, &up->msg_rtime);
 408         err |= __put_user(m->msg_ctime, &up->msg_ctime);
 409         err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
 410         err |= __put_user(m->msg_qnum, &up->msg_qnum);
 411         err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
 412         err |= __put_user(m->msg_lspid, &up->msg_lspid);
 413         err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
 414         return err;
 415 }
 416
 417 long compat_sys_msgctl(int first, int second, void __user *uptr)
 418 {
 419         int err, err2;
 420         struct msqid64_ds m64;
 421         int version = compat_ipc_parse_version(&second);
 422         void __user *p;
 423
 424         switch (second & (~IPC_64)) {
 425         case IPC_INFO:
 426         case IPC_RMID:
 427         case MSG_INFO:
 428                 err = sys_msgctl(first, second, uptr);
 429                 break;
 430
 431         case IPC_SET:
 432                 if (version == IPC_64) {
 433                         err = get_compat_msqid64(&m64, uptr);
 434                 } else {
 435                         err = get_compat_msqid(&m64, uptr);
 436                 }
 437                 if (err)
 438                         break;
 439                 p = compat_alloc_user_space(sizeof(m64));
 440                 if (copy_to_user(p, &m64, sizeof(m64)))
 441                         err = -EFAULT;
 442                 else
 443                         err = sys_msgctl(first, second, p);
 444                 break;
 445
 446         case IPC_STAT:
 447         case MSG_STAT:
 448                 p = compat_alloc_user_space(sizeof(m64));
 449                 err = sys_msgctl(first, second, p);
 450                 if (err < 0)
 451                         break;
 452                 if (copy_from_user(&m64, p, sizeof(m64)))
 453                         err2 = -EFAULT;
 454                 else if (version == IPC_64)
 455                         err2 = put_compat_msqid64_ds(&m64, uptr);
 456                 else
 457                         err2 = put_compat_msqid_ds(&m64, uptr);
 458                 if (err2)
 459                         err = -EFAULT;
 460                 break;
 461
 462         default:
 463                 err = -EINVAL;
 464                 break;
 465         }
 466         return err;
 467 }
 468
 469 long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
 470                         void __user *uptr)
 471 {
 472         int err;
 473         unsigned long raddr;
 474         compat_ulong_t __user *uaddr;
 475
 476         if (version == 1)
 477                 return -EINVAL;
 478         err = do_shmat(first, uptr, second, &raddr);
 479         if (err < 0)
 480                 return err;
 481         uaddr = compat_ptr(third);
 482         return put_user(raddr, uaddr);
 483 }
 484
 485 static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
 486                                         struct compat_shmid64_ds __user *up64)
 487 {
 488         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 489                 return -EFAULT;
 490         return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 491 }
 492
 493 static inline int get_compat_shmid_ds(struct shmid64_ds *s,
 494                                       struct compat_shmid_ds __user *up)
 495 {
 496         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 497                 return -EFAULT;
 498         return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 499 }
 500
 501 static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
 502                                         struct compat_shmid64_ds __user *up64)
 503 {
 504         int err;
 505
 506         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 507                 return -EFAULT;
 508         err  = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 509         err |= __put_user(s64->shm_atime, &up64->shm_atime);
 510         err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
 511         err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
 512         err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
 513         err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
 514         err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
 515         err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
 516         return err;
 517 }
 518
 519 static inline int put_compat_shmid_ds(struct shmid64_ds *s,
 520                                       struct compat_shmid_ds __user *up)
 521 {
 522         int err;
 523
 524         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 525                 return -EFAULT;
 526         err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 527         err |= __put_user(s->shm_atime, &up->shm_atime);
 528         err |= __put_user(s->shm_dtime, &up->shm_dtime);
 529         err |= __put_user(s->shm_ctime, &up->shm_ctime);
 530         err |= __put_user(s->shm_segsz, &up->shm_segsz);
 531         err |= __put_user(s->shm_nattch, &up->shm_nattch);
 532         err |= __put_user(s->shm_cpid, &up->shm_cpid);
 533         err |= __put_user(s->shm_lpid, &up->shm_lpid);
 534         return err;
 535 }
 536
 537 static inline int put_compat_shminfo64(struct shminfo64 *smi,
 538                                        struct compat_shminfo64 __user *up64)
 539 {
 540         int err;
 541
 542         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 543                 return -EFAULT;
 544         if (smi->shmmax > INT_MAX)
 545                 smi->shmmax = INT_MAX;
 546         err  = __put_user(smi->shmmax, &up64->shmmax);
 547         err |= __put_user(smi->shmmin, &up64->shmmin);
 548         err |= __put_user(smi->shmmni, &up64->shmmni);
 549         err |= __put_user(smi->shmseg, &up64->shmseg);
 550         err |= __put_user(smi->shmall, &up64->shmall);
 551         return err;
 552 }
 553
 554 static inline int put_compat_shminfo(struct shminfo64 *smi,
 555                                      struct shminfo __user *up)
 556 {
 557         int err;
 558
 559         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 560                 return -EFAULT;
 561         if (smi->shmmax > INT_MAX)
 562                 smi->shmmax = INT_MAX;
 563         err  = __put_user(smi->shmmax, &up->shmmax);
 564         err |= __put_user(smi->shmmin, &up->shmmin);
 565         err |= __put_user(smi->shmmni, &up->shmmni);
 566         err |= __put_user(smi->shmseg, &up->shmseg);
 567         err |= __put_user(smi->shmall, &up->shmall);
 568         return err;
 569 }
 570
 571 static inline int put_compat_shm_info(struct shm_info __user *ip,
 572                                       struct compat_shm_info __user *uip)
 573 {
 574         int err;
 575         struct shm_info si;
 576
 577         if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
 578             copy_from_user(&si, ip, sizeof(si)))
 579                 return -EFAULT;
 580         err  = __put_user(si.used_ids, &uip->used_ids);
 581         err |= __put_user(si.shm_tot, &uip->shm_tot);
 582         err |= __put_user(si.shm_rss, &uip->shm_rss);
 583         err |= __put_user(si.shm_swp, &uip->shm_swp);
 584         err |= __put_user(si.swap_attempts, &uip->swap_attempts);
 585         err |= __put_user(si.swap_successes, &uip->swap_successes);
 586         return err;
 587 }
 588
 589 long compat_sys_shmctl(int first, int second, void __user *uptr)
 590 {
 591         void __user *p;
 592         struct shmid64_ds s64;
 593         struct shminfo64 smi;
 594         int err, err2;
 595         int version = compat_ipc_parse_version(&second);
 596
 597         switch (second & (~IPC_64)) {
 598         case IPC_RMID:
 599         case SHM_LOCK:
 600         case SHM_UNLOCK:
 601                 err = sys_shmctl(first, second, uptr);
 602                 break;
 603
 604         case IPC_INFO:
 605                 p = compat_alloc_user_space(sizeof(smi));
 606                 err = sys_shmctl(first, second, p);
 607                 if (err < 0)
 608                         break;
 609                 if (copy_from_user(&smi, p, sizeof(smi)))
 610                         err2 = -EFAULT;
 611                 else if (version == IPC_64)
 612                         err2 = put_compat_shminfo64(&smi, uptr);
 613                 else
 614                         err2 = put_compat_shminfo(&smi, uptr);
 615                 if (err2)
 616                         err = -EFAULT;
 617                 break;
 618
 619
 620         case IPC_SET:
 621                 if (version == IPC_64) {
 622                         err = get_compat_shmid64_ds(&s64, uptr);
 623                 } else {
 624                         err = get_compat_shmid_ds(&s64, uptr);
 625                 }
 626                 if (err)
 627                         break;
 628                 p = compat_alloc_user_space(sizeof(s64));
 629                 if (copy_to_user(p, &s64, sizeof(s64)))
 630                         err = -EFAULT;
 631                 else
 632                         err = sys_shmctl(first, second, p);
 633                 break;
 634
 635         case IPC_STAT:
 636         case SHM_STAT:
 637                 p = compat_alloc_user_space(sizeof(s64));
 638                 err = sys_shmctl(first, second, p);
 639                 if (err < 0)
 640                         break;
 641                 if (copy_from_user(&s64, p, sizeof(s64)))
 642                         err2 = -EFAULT;
 643                 else if (version == IPC_64)
 644                         err2 = put_compat_shmid64_ds(&s64, uptr);
 645                 else
 646                         err2 = put_compat_shmid_ds(&s64, uptr);
 647                 if (err2)
 648                         err = -EFAULT;
 649                 break;
 650
 651         case SHM_INFO:
 652                 p = compat_alloc_user_space(sizeof(struct shm_info));
 653                 err = sys_shmctl(first, second, p);
 654                 if (err < 0)
 655                         break;
 656                 err2 = put_compat_shm_info(p, uptr);
 657                 if (err2)
 658                         err = -EFAULT;
 659                 break;
 660
 661         default:
 662                 err = -EINVAL;
 663                 break;
 664         }
 665         return err;
 666 }
 667
 668 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 669                 unsigned nsops, const struct compat_timespec __user *timeout)
 670 {
 671         struct timespec __user *ts64 = NULL;
 672         if (timeout) {
 673                 struct timespec ts;
 674                 ts64 = compat_alloc_user_space(sizeof(*ts64));
 675                 if (get_compat_timespec(&ts, timeout))
 676                         return -EFAULT;
 677                 if (copy_to_user(ts64, &ts, sizeof(ts)))
 678                         return -EFAULT;
 679         }
 680         return sys_semtimedop(semid, tsems, nsops, ts64);
 681 }