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 #include <linux/ptrace.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 #ifdef  __ARCH_WANT_COMPAT_IPC_PARSE_VERSION
 122         int version = *cmd & IPC_64;
 123
 124         /* this is tricky: architectures that have support for the old
 125          * ipc structures in 64 bit binaries need to have IPC_64 set
 126          * in cmd, the others need to have it cleared */
 127 #ifndef ipc_parse_version
 128         *cmd |= IPC_64;
 129 #else
 130         *cmd &= ~IPC_64;
 131 #endif
 132         return version;
 133 #else
 134         /* With the asm-generic APIs, we always use the 64-bit versions. */
 135         return IPC_64;
 136 #endif
 137 }
 138
 139 static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
 140                                           struct compat_ipc64_perm __user *up64)
 141 {
 142         int err;
 143
 144         err  = __get_user(p64->uid, &up64->uid);
 145         err |= __get_user(p64->gid, &up64->gid);
 146         err |= __get_user(p64->mode, &up64->mode);
 147         return err;
 148 }
 149
 150 static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
 151                                         struct compat_ipc_perm __user *up)
 152 {
 153         int err;
 154
 155         err  = __get_user(p->uid, &up->uid);
 156         err |= __get_user(p->gid, &up->gid);
 157         err |= __get_user(p->mode, &up->mode);
 158         return err;
 159 }
 160
 161 static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
 162                                           struct compat_ipc64_perm __user *up64)
 163 {
 164         int err;
 165
 166         err  = __put_user(p64->key, &up64->key);
 167         err |= __put_user(p64->uid, &up64->uid);
 168         err |= __put_user(p64->gid, &up64->gid);
 169         err |= __put_user(p64->cuid, &up64->cuid);
 170         err |= __put_user(p64->cgid, &up64->cgid);
 171         err |= __put_user(p64->mode, &up64->mode);
 172         err |= __put_user(p64->seq, &up64->seq);
 173         return err;
 174 }
 175
 176 static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
 177                                         struct compat_ipc_perm __user *up)
 178 {
 179         int err;
 180         __compat_uid_t u;
 181         __compat_gid_t g;
 182
 183         err  = __put_user(p->key, &up->key);
 184         SET_UID(u, p->uid);
 185         err |= __put_user(u, &up->uid);
 186         SET_GID(g, p->gid);
 187         err |= __put_user(g, &up->gid);
 188         SET_UID(u, p->cuid);
 189         err |= __put_user(u, &up->cuid);
 190         SET_GID(g, p->cgid);
 191         err |= __put_user(g, &up->cgid);
 192         err |= __put_user(p->mode, &up->mode);
 193         err |= __put_user(p->seq, &up->seq);
 194         return err;
 195 }
 196
 197 static inline int get_compat_semid64_ds(struct semid64_ds *s64,
 198                                         struct compat_semid64_ds __user *up64)
 199 {
 200         if (!access_ok (VERIFY_READ, up64, sizeof(*up64)))
 201                 return -EFAULT;
 202         return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 203 }
 204
 205 static inline int get_compat_semid_ds(struct semid64_ds *s,
 206                                       struct compat_semid_ds __user *up)
 207 {
 208         if (!access_ok (VERIFY_READ, up, sizeof(*up)))
 209                 return -EFAULT;
 210         return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 211 }
 212
 213 static inline int put_compat_semid64_ds(struct semid64_ds *s64,
 214                                         struct compat_semid64_ds __user *up64)
 215 {
 216         int err;
 217
 218         if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64)))
 219                 return -EFAULT;
 220         err  = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 221         err |= __put_user(s64->sem_otime, &up64->sem_otime);
 222         err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
 223         err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
 224         return err;
 225 }
 226
 227 static inline int put_compat_semid_ds(struct semid64_ds *s,
 228                                       struct compat_semid_ds __user *up)
 229 {
 230         int err;
 231
 232         if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
 233                 return -EFAULT;
 234         err  = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 235         err |= __put_user(s->sem_otime, &up->sem_otime);
 236         err |= __put_user(s->sem_ctime, &up->sem_ctime);
 237         err |= __put_user(s->sem_nsems, &up->sem_nsems);
 238         return err;
 239 }
 240
 241 static long do_compat_semctl(int first, int second, int third, u32 pad)
 242 {
 243         union semun fourth;
 244         int err, err2;
 245         struct semid64_ds s64;
 246         struct semid64_ds __user *up64;
 247         int version = compat_ipc_parse_version(&third);
 248
 249         memset(&s64, 0, sizeof(s64));
 250
 251         if ((third & (~IPC_64)) == SETVAL)
 252                 fourth.val = (int) pad;
 253         else
 254                 fourth.__pad = compat_ptr(pad);
 255         switch (third & (~IPC_64)) {
 256         case IPC_INFO:
 257         case IPC_RMID:
 258         case SEM_INFO:
 259         case GETVAL:
 260         case GETPID:
 261         case GETNCNT:
 262         case GETZCNT:
 263         case GETALL:
 264         case SETVAL:
 265         case SETALL:
 266                 err = sys_semctl(first, second, third, fourth);
 267                 break;
 268
 269         case IPC_STAT:
 270         case SEM_STAT:
 271                 up64 = compat_alloc_user_space(sizeof(s64));
 272                 fourth.__pad = up64;
 273                 err = sys_semctl(first, second, third, fourth);
 274                 if (err < 0)
 275                         break;
 276                 if (copy_from_user(&s64, up64, sizeof(s64)))
 277                         err2 = -EFAULT;
 278                 else if (version == IPC_64)
 279                         err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
 280                 else
 281                         err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
 282                 if (err2)
 283                         err = -EFAULT;
 284                 break;
 285
 286         case IPC_SET:
 287                 if (version == IPC_64) {
 288                         err = get_compat_semid64_ds(&s64, compat_ptr(pad));
 289                 } else {
 290                         err = get_compat_semid_ds(&s64, compat_ptr(pad));
 291                 }
 292                 up64 = compat_alloc_user_space(sizeof(s64));
 293                 if (copy_to_user(up64, &s64, sizeof(s64)))
 294                         err = -EFAULT;
 295                 if (err)
 296                         break;
 297
 298                 fourth.__pad = up64;
 299                 err = sys_semctl(first, second, third, fourth);
 300                 break;
 301
 302         default:
 303                 err = -EINVAL;
 304                 break;
 305         }
 306         return err;
 307 }
 308
 309 #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
 310 long compat_sys_semctl(int first, int second, int third, void __user *uptr)
 311 {
 312         u32 pad;
 313
 314         if (!uptr)
 315                 return -EINVAL;
 316         if (get_user(pad, (u32 __user *) uptr))
 317                 return -EFAULT;
 318         return do_compat_semctl(first, second, third, pad);
 319 }
 320
 321 long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
 322 {
 323         struct compat_msgbuf __user *up = uptr;
 324         long type;
 325
 326         if (first < 0)
 327                 return -EINVAL;
 328         if (second < 0)
 329                 return -EINVAL;
 330
 331         if (get_user(type, &up->mtype))
 332                 return -EFAULT;
 333
 334         return do_msgsnd(first, type, up->mtext, second, third);
 335 }
 336
 337 long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
 338                            int version, void __user *uptr)
 339 {
 340         struct compat_msgbuf __user *up;
 341         long type;
 342         int err;
 343
 344         if (first < 0)
 345                 return -EINVAL;
 346         if (second < 0)
 347                 return -EINVAL;
 348
 349         if (!version) {
 350                 struct compat_ipc_kludge ipck;
 351                 err = -EINVAL;
 352                 if (!uptr)
 353                         goto out;
 354                 err = -EFAULT;
 355                 if (copy_from_user (&ipck, uptr, sizeof(ipck)))
 356                         goto out;
 357                 uptr = compat_ptr(ipck.msgp);
 358                 msgtyp = ipck.msgtyp;
 359         }
 360         up = uptr;
 361         err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
 362         if (err < 0)
 363                 goto out;
 364         if (put_user(type, &up->mtype))
 365                 err = -EFAULT;
 366 out:
 367         return err;
 368 }
 369 #else
 370 long compat_sys_semctl(int semid, int semnum, int cmd, int arg)
 371 {
 372         return do_compat_semctl(semid, semnum, cmd, arg);
 373 }
 374
 375 long compat_sys_msgsnd(int msqid, struct compat_msgbuf __user *msgp,
 376                        compat_ssize_t msgsz, int msgflg)
 377 {
 378         compat_long_t mtype;
 379
 380         if (get_user(mtype, &msgp->mtype))
 381                 return -EFAULT;
 382         return do_msgsnd(msqid, mtype, msgp->mtext, (ssize_t)msgsz, msgflg);
 383 }
 384
 385 long compat_sys_msgrcv(int msqid, struct compat_msgbuf __user *msgp,
 386                        compat_ssize_t msgsz, long msgtyp, int msgflg)
 387 {
 388         long err, mtype;
 389
 390         err =  do_msgrcv(msqid, &mtype, msgp->mtext, (ssize_t)msgsz, msgtyp, msgflg);
 391         if (err < 0)
 392                 goto out;
 393
 394         if (put_user(mtype, &msgp->mtype))
 395                 err = -EFAULT;
 396  out:
 397         return err;
 398 }
 399 #endif
 400
 401 static inline int get_compat_msqid64(struct msqid64_ds *m64,
 402                                      struct compat_msqid64_ds __user *up64)
 403 {
 404         int err;
 405
 406         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 407                 return -EFAULT;
 408         err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 409         err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
 410         return err;
 411 }
 412
 413 static inline int get_compat_msqid(struct msqid64_ds *m,
 414                                    struct compat_msqid_ds __user *up)
 415 {
 416         int err;
 417
 418         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 419                 return -EFAULT;
 420         err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 421         err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
 422         return err;
 423 }
 424
 425 static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
 426                                  struct compat_msqid64_ds __user *up64)
 427 {
 428         int err;
 429
 430         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 431                 return -EFAULT;
 432         err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 433         err |= __put_user(m64->msg_stime, &up64->msg_stime);
 434         err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
 435         err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
 436         err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
 437         err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
 438         err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
 439         err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
 440         err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
 441         return err;
 442 }
 443
 444 static inline int put_compat_msqid_ds(struct msqid64_ds *m,
 445                                       struct compat_msqid_ds __user *up)
 446 {
 447         int err;
 448
 449         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 450                 return -EFAULT;
 451         err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 452         err |= __put_user(m->msg_stime, &up->msg_stime);
 453         err |= __put_user(m->msg_rtime, &up->msg_rtime);
 454         err |= __put_user(m->msg_ctime, &up->msg_ctime);
 455         err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
 456         err |= __put_user(m->msg_qnum, &up->msg_qnum);
 457         err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
 458         err |= __put_user(m->msg_lspid, &up->msg_lspid);
 459         err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
 460         return err;
 461 }
 462
 463 long compat_sys_msgctl(int first, int second, void __user *uptr)
 464 {
 465         int err, err2;
 466         struct msqid64_ds m64;
 467         int version = compat_ipc_parse_version(&second);
 468         void __user *p;
 469
 470         memset(&m64, 0, sizeof(m64));
 471
 472         switch (second & (~IPC_64)) {
 473         case IPC_INFO:
 474         case IPC_RMID:
 475         case MSG_INFO:
 476                 err = sys_msgctl(first, second, uptr);
 477                 break;
 478
 479         case IPC_SET:
 480                 if (version == IPC_64) {
 481                         err = get_compat_msqid64(&m64, uptr);
 482                 } else {
 483                         err = get_compat_msqid(&m64, uptr);
 484                 }
 485                 if (err)
 486                         break;
 487                 p = compat_alloc_user_space(sizeof(m64));
 488                 if (copy_to_user(p, &m64, sizeof(m64)))
 489                         err = -EFAULT;
 490                 else
 491                         err = sys_msgctl(first, second, p);
 492                 break;
 493
 494         case IPC_STAT:
 495         case MSG_STAT:
 496                 p = compat_alloc_user_space(sizeof(m64));
 497                 err = sys_msgctl(first, second, p);
 498                 if (err < 0)
 499                         break;
 500                 if (copy_from_user(&m64, p, sizeof(m64)))
 501                         err2 = -EFAULT;
 502                 else if (version == IPC_64)
 503                         err2 = put_compat_msqid64_ds(&m64, uptr);
 504                 else
 505                         err2 = put_compat_msqid_ds(&m64, uptr);
 506                 if (err2)
 507                         err = -EFAULT;
 508                 break;
 509
 510         default:
 511                 err = -EINVAL;
 512                 break;
 513         }
 514         return err;
 515 }
 516
 517 #ifndef COMPAT_SHMLBA
 518 #define COMPAT_SHMLBA   SHMLBA
 519 #endif
 520
 521 #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
 522 long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
 523                         void __user *uptr)
 524 {
 525         int err;
 526         unsigned long raddr;
 527         compat_ulong_t __user *uaddr;
 528
 529         if (version == 1)
 530                 return -EINVAL;
 531         err = do_shmat(first, uptr, second, &raddr, COMPAT_SHMLBA);
 532         if (err < 0)
 533                 return err;
 534         uaddr = compat_ptr(third);
 535         return put_user(raddr, uaddr);
 536 }
 537 #else
 538 long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg)
 539 {
 540         unsigned long ret;
 541         long err;
 542
 543         err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
 544         if (err)
 545                 return err;
 546         force_successful_syscall_return();
 547         return (long)ret;
 548 }
 549 #endif
 550
 551 static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
 552                                         struct compat_shmid64_ds __user *up64)
 553 {
 554         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 555                 return -EFAULT;
 556         return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 557 }
 558
 559 static inline int get_compat_shmid_ds(struct shmid64_ds *s,
 560                                       struct compat_shmid_ds __user *up)
 561 {
 562         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 563                 return -EFAULT;
 564         return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 565 }
 566
 567 static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
 568                                         struct compat_shmid64_ds __user *up64)
 569 {
 570         int err;
 571
 572         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 573                 return -EFAULT;
 574         err  = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 575         err |= __put_user(s64->shm_atime, &up64->shm_atime);
 576         err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
 577         err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
 578         err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
 579         err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
 580         err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
 581         err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
 582         return err;
 583 }
 584
 585 static inline int put_compat_shmid_ds(struct shmid64_ds *s,
 586                                       struct compat_shmid_ds __user *up)
 587 {
 588         int err;
 589
 590         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 591                 return -EFAULT;
 592         err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 593         err |= __put_user(s->shm_atime, &up->shm_atime);
 594         err |= __put_user(s->shm_dtime, &up->shm_dtime);
 595         err |= __put_user(s->shm_ctime, &up->shm_ctime);
 596         err |= __put_user(s->shm_segsz, &up->shm_segsz);
 597         err |= __put_user(s->shm_nattch, &up->shm_nattch);
 598         err |= __put_user(s->shm_cpid, &up->shm_cpid);
 599         err |= __put_user(s->shm_lpid, &up->shm_lpid);
 600         return err;
 601 }
 602
 603 static inline int put_compat_shminfo64(struct shminfo64 *smi,
 604                                        struct compat_shminfo64 __user *up64)
 605 {
 606         int err;
 607
 608         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 609                 return -EFAULT;
 610         if (smi->shmmax > INT_MAX)
 611                 smi->shmmax = INT_MAX;
 612         err  = __put_user(smi->shmmax, &up64->shmmax);
 613         err |= __put_user(smi->shmmin, &up64->shmmin);
 614         err |= __put_user(smi->shmmni, &up64->shmmni);
 615         err |= __put_user(smi->shmseg, &up64->shmseg);
 616         err |= __put_user(smi->shmall, &up64->shmall);
 617         return err;
 618 }
 619
 620 static inline int put_compat_shminfo(struct shminfo64 *smi,
 621                                      struct shminfo __user *up)
 622 {
 623         int err;
 624
 625         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 626                 return -EFAULT;
 627         if (smi->shmmax > INT_MAX)
 628                 smi->shmmax = INT_MAX;
 629         err  = __put_user(smi->shmmax, &up->shmmax);
 630         err |= __put_user(smi->shmmin, &up->shmmin);
 631         err |= __put_user(smi->shmmni, &up->shmmni);
 632         err |= __put_user(smi->shmseg, &up->shmseg);
 633         err |= __put_user(smi->shmall, &up->shmall);
 634         return err;
 635 }
 636
 637 static inline int put_compat_shm_info(struct shm_info __user *ip,
 638                                       struct compat_shm_info __user *uip)
 639 {
 640         int err;
 641         struct shm_info si;
 642
 643         if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
 644             copy_from_user(&si, ip, sizeof(si)))
 645                 return -EFAULT;
 646         err  = __put_user(si.used_ids, &uip->used_ids);
 647         err |= __put_user(si.shm_tot, &uip->shm_tot);
 648         err |= __put_user(si.shm_rss, &uip->shm_rss);
 649         err |= __put_user(si.shm_swp, &uip->shm_swp);
 650         err |= __put_user(si.swap_attempts, &uip->swap_attempts);
 651         err |= __put_user(si.swap_successes, &uip->swap_successes);
 652         return err;
 653 }
 654
 655 long compat_sys_shmctl(int first, int second, void __user *uptr)
 656 {
 657         void __user *p;
 658         struct shmid64_ds s64;
 659         struct shminfo64 smi;
 660         int err, err2;
 661         int version = compat_ipc_parse_version(&second);
 662
 663         memset(&s64, 0, sizeof(s64));
 664
 665         switch (second & (~IPC_64)) {
 666         case IPC_RMID:
 667         case SHM_LOCK:
 668         case SHM_UNLOCK:
 669                 err = sys_shmctl(first, second, uptr);
 670                 break;
 671
 672         case IPC_INFO:
 673                 p = compat_alloc_user_space(sizeof(smi));
 674                 err = sys_shmctl(first, second, p);
 675                 if (err < 0)
 676                         break;
 677                 if (copy_from_user(&smi, p, sizeof(smi)))
 678                         err2 = -EFAULT;
 679                 else if (version == IPC_64)
 680                         err2 = put_compat_shminfo64(&smi, uptr);
 681                 else
 682                         err2 = put_compat_shminfo(&smi, uptr);
 683                 if (err2)
 684                         err = -EFAULT;
 685                 break;
 686
 687
 688         case IPC_SET:
 689                 if (version == IPC_64) {
 690                         err = get_compat_shmid64_ds(&s64, uptr);
 691                 } else {
 692                         err = get_compat_shmid_ds(&s64, uptr);
 693                 }
 694                 if (err)
 695                         break;
 696                 p = compat_alloc_user_space(sizeof(s64));
 697                 if (copy_to_user(p, &s64, sizeof(s64)))
 698                         err = -EFAULT;
 699                 else
 700                         err = sys_shmctl(first, second, p);
 701                 break;
 702
 703         case IPC_STAT:
 704         case SHM_STAT:
 705                 p = compat_alloc_user_space(sizeof(s64));
 706                 err = sys_shmctl(first, second, p);
 707                 if (err < 0)
 708                         break;
 709                 if (copy_from_user(&s64, p, sizeof(s64)))
 710                         err2 = -EFAULT;
 711                 else if (version == IPC_64)
 712                         err2 = put_compat_shmid64_ds(&s64, uptr);
 713                 else
 714                         err2 = put_compat_shmid_ds(&s64, uptr);
 715                 if (err2)
 716                         err = -EFAULT;
 717                 break;
 718
 719         case SHM_INFO:
 720                 p = compat_alloc_user_space(sizeof(struct shm_info));
 721                 err = sys_shmctl(first, second, p);
 722                 if (err < 0)
 723                         break;
 724                 err2 = put_compat_shm_info(p, uptr);
 725                 if (err2)
 726                         err = -EFAULT;
 727                 break;
 728
 729         default:
 730                 err = -EINVAL;
 731                 break;
 732         }
 733         return err;
 734 }
 735
 736 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 737                 unsigned nsops, const struct compat_timespec __user *timeout)
 738 {
 739         struct timespec __user *ts64 = NULL;
 740         if (timeout) {
 741                 struct timespec ts;
 742                 ts64 = compat_alloc_user_space(sizeof(*ts64));
 743                 if (get_compat_timespec(&ts, timeout))
 744                         return -EFAULT;
 745                 if (copy_to_user(ts64, &ts, sizeof(ts)))
 746                         return -EFAULT;
 747         }
 748         return sys_semtimedop(semid, tsems, nsops, ts64);
 749 }