linux/ipc/compat.c
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   1/*
   2 * 32 bit compatibility code for System V IPC
   3 *
   4 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   6 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7 * Copyright (C) 2000           VA Linux Co
   8 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   9 * Copyright (C) 2000           Hewlett-Packard Co.
  10 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11 * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
  12 * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
  13 * Copyright (C) 2000           Silicon Graphics, Inc.
  14 * Copyright (C) 2001           IBM
  15 * Copyright (C) 2004           IBM Deutschland Entwicklung GmbH, IBM Corporation
  16 * Copyright (C) 2004           Arnd Bergmann (arnd@arndb.de)
  17 *
  18 * This code is collected from the versions for sparc64, mips64, s390x, ia64,
  19 * ppc64 and x86_64, all of which are based on the original sparc64 version
  20 * by Jakub Jelinek.
  21 *
  22 */
  23#include <linux/compat.h>
  24#include <linux/errno.h>
  25#include <linux/highuid.h>
  26#include <linux/init.h>
  27#include <linux/msg.h>
  28#include <linux/shm.h>
  29#include <linux/syscalls.h>
  30#include <linux/ptrace.h>
  31
  32#include <linux/mutex.h>
  33#include <asm/uaccess.h>
  34
  35#include "util.h"
  36
  37struct compat_msgbuf {
  38        compat_long_t mtype;
  39        char mtext[1];
  40};
  41
  42struct compat_ipc_perm {
  43        key_t key;
  44        __compat_uid_t uid;
  45        __compat_gid_t gid;
  46        __compat_uid_t cuid;
  47        __compat_gid_t cgid;
  48        compat_mode_t mode;
  49        unsigned short seq;
  50};
  51
  52struct compat_semid_ds {
  53        struct compat_ipc_perm sem_perm;
  54        compat_time_t sem_otime;
  55        compat_time_t sem_ctime;
  56        compat_uptr_t sem_base;
  57        compat_uptr_t sem_pending;
  58        compat_uptr_t sem_pending_last;
  59        compat_uptr_t undo;
  60        unsigned short sem_nsems;
  61};
  62
  63struct compat_msqid_ds {
  64        struct compat_ipc_perm msg_perm;
  65        compat_uptr_t msg_first;
  66        compat_uptr_t msg_last;
  67        compat_time_t msg_stime;
  68        compat_time_t msg_rtime;
  69        compat_time_t msg_ctime;
  70        compat_ulong_t msg_lcbytes;
  71        compat_ulong_t msg_lqbytes;
  72        unsigned short msg_cbytes;
  73        unsigned short msg_qnum;
  74        unsigned short msg_qbytes;
  75        compat_ipc_pid_t msg_lspid;
  76        compat_ipc_pid_t msg_lrpid;
  77};
  78
  79struct compat_shmid_ds {
  80        struct compat_ipc_perm shm_perm;
  81        int shm_segsz;
  82        compat_time_t shm_atime;
  83        compat_time_t shm_dtime;
  84        compat_time_t shm_ctime;
  85        compat_ipc_pid_t shm_cpid;
  86        compat_ipc_pid_t shm_lpid;
  87        unsigned short shm_nattch;
  88        unsigned short shm_unused;
  89        compat_uptr_t shm_unused2;
  90        compat_uptr_t shm_unused3;
  91};
  92
  93struct compat_ipc_kludge {
  94        compat_uptr_t msgp;
  95        compat_long_t msgtyp;
  96};
  97
  98struct compat_shminfo64 {
  99        compat_ulong_t shmmax;
 100        compat_ulong_t shmmin;
 101        compat_ulong_t shmmni;
 102        compat_ulong_t shmseg;
 103        compat_ulong_t shmall;
 104        compat_ulong_t __unused1;
 105        compat_ulong_t __unused2;
 106        compat_ulong_t __unused3;
 107        compat_ulong_t __unused4;
 108};
 109
 110struct compat_shm_info {
 111        compat_int_t used_ids;
 112        compat_ulong_t shm_tot, shm_rss, shm_swp;
 113        compat_ulong_t swap_attempts, swap_successes;
 114};
 115
 116extern int sem_ctls[];
 117#define sc_semopm       (sem_ctls[2])
 118
 119static inline int compat_ipc_parse_version(int *cmd)
 120{
 121#ifdef  CONFIG_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
 139static 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
 150static 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
 161static 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
 176static 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
 197static 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
 205static 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
 213static 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
 227static 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
 241static 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
 310long 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
 321long 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
 337long 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;
 366out:
 367        return err;
 368}
 369#else
 370long compat_sys_semctl(int semid, int semnum, int cmd, int arg)
 371{
 372        return do_compat_semctl(semid, semnum, cmd, arg);
 373}
 374
 375long 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
 385long 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
 401static 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
 413static 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
 425static 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
 444static 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
 463long 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
 522long 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
 538long 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
 551static 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
 559static 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
 567static 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
 585static 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
 603static 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
 620static 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
 637static 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
 655long 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
 736long 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}
 750
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