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        unsigned long 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#ifdef __BIG_ENDIAN
 253                fourth = (unsigned long)pad << 32;
 254#else
 255                fourth = pad;
 256#endif
 257        else
 258                fourth = (unsigned long)compat_ptr(pad);
 259        switch (third & (~IPC_64)) {
 260        case IPC_INFO:
 261        case IPC_RMID:
 262        case SEM_INFO:
 263        case GETVAL:
 264        case GETPID:
 265        case GETNCNT:
 266        case GETZCNT:
 267        case GETALL:
 268        case SETVAL:
 269        case SETALL:
 270                err = sys_semctl(first, second, third, fourth);
 271                break;
 272
 273        case IPC_STAT:
 274        case SEM_STAT:
 275                up64 = compat_alloc_user_space(sizeof(s64));
 276                fourth = (unsigned long)up64;
 277                err = sys_semctl(first, second, third, fourth);
 278                if (err < 0)
 279                        break;
 280                if (copy_from_user(&s64, up64, sizeof(s64)))
 281                        err2 = -EFAULT;
 282                else if (version == IPC_64)
 283                        err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
 284                else
 285                        err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
 286                if (err2)
 287                        err = -EFAULT;
 288                break;
 289
 290        case IPC_SET:
 291                if (version == IPC_64) {
 292                        err = get_compat_semid64_ds(&s64, compat_ptr(pad));
 293                } else {
 294                        err = get_compat_semid_ds(&s64, compat_ptr(pad));
 295                }
 296                up64 = compat_alloc_user_space(sizeof(s64));
 297                if (copy_to_user(up64, &s64, sizeof(s64)))
 298                        err = -EFAULT;
 299                if (err)
 300                        break;
 301
 302                fourth = (unsigned long)up64;
 303                err = sys_semctl(first, second, third, fourth);
 304                break;
 305
 306        default:
 307                err = -EINVAL;
 308                break;
 309        }
 310        return err;
 311}
 312
 313static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
 314{
 315        struct compat_msgbuf __user *msgp = dest;
 316        size_t msgsz;
 317
 318        if (put_user(msg->m_type, &msgp->mtype))
 319                return -EFAULT;
 320
 321        msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
 322        if (store_msg(msgp->mtext, msg, msgsz))
 323                return -EFAULT;
 324        return msgsz;
 325}
 326
 327#ifndef COMPAT_SHMLBA
 328#define COMPAT_SHMLBA   SHMLBA
 329#endif
 330
 331#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
 332COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
 333        u32, third, compat_uptr_t, ptr, u32, fifth)
 334{
 335        int version;
 336        u32 pad;
 337
 338        version = call >> 16; /* hack for backward compatibility */
 339        call &= 0xffff;
 340
 341        switch (call) {
 342        case SEMOP:
 343                /* struct sembuf is the same on 32 and 64bit :)) */
 344                return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 345        case SEMTIMEDOP:
 346                return compat_sys_semtimedop(first, compat_ptr(ptr), second,
 347                                                compat_ptr(fifth));
 348        case SEMGET:
 349                return sys_semget(first, second, third);
 350        case SEMCTL:
 351                if (!ptr)
 352                        return -EINVAL;
 353                if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
 354                        return -EFAULT;
 355                return do_compat_semctl(first, second, third, pad);
 356
 357        case MSGSND: {
 358                struct compat_msgbuf __user *up = compat_ptr(ptr);
 359                compat_long_t type;
 360
 361                if (first < 0 || second < 0)
 362                        return -EINVAL;
 363
 364                if (get_user(type, &up->mtype))
 365                        return -EFAULT;
 366
 367                return do_msgsnd(first, type, up->mtext, second, third);
 368        }
 369        case MSGRCV: {
 370                void __user *uptr = compat_ptr(ptr);
 371
 372                if (first < 0 || second < 0)
 373                        return -EINVAL;
 374
 375                if (!version) {
 376                        struct compat_ipc_kludge ipck;
 377                        if (!uptr)
 378                                return -EINVAL;
 379                        if (copy_from_user (&ipck, uptr, sizeof(ipck)))
 380                                return -EFAULT;
 381                        uptr = compat_ptr(ipck.msgp);
 382                        fifth = ipck.msgtyp;
 383                }
 384                return do_msgrcv(first, uptr, second, fifth, third,
 385                                 compat_do_msg_fill);
 386        }
 387        case MSGGET:
 388                return sys_msgget(first, second);
 389        case MSGCTL:
 390                return compat_sys_msgctl(first, second, compat_ptr(ptr));
 391
 392        case SHMAT: {
 393                int err;
 394                unsigned long raddr;
 395
 396                if (version == 1)
 397                        return -EINVAL;
 398                err = do_shmat(first, compat_ptr(ptr), second, &raddr,
 399                               COMPAT_SHMLBA);
 400                if (err < 0)
 401                        return err;
 402                return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
 403        }
 404        case SHMDT:
 405                return sys_shmdt(compat_ptr(ptr));
 406        case SHMGET:
 407                return sys_shmget(first, (unsigned)second, third);
 408        case SHMCTL:
 409                return compat_sys_shmctl(first, second, compat_ptr(ptr));
 410        }
 411
 412        return -ENOSYS;
 413}
 414#endif
 415
 416COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
 417{
 418        return do_compat_semctl(semid, semnum, cmd, arg);
 419}
 420
 421COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
 422                       compat_ssize_t, msgsz, int, msgflg)
 423{
 424        struct compat_msgbuf __user *up = compat_ptr(msgp);
 425        compat_long_t mtype;
 426
 427        if (get_user(mtype, &up->mtype))
 428                return -EFAULT;
 429        return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
 430}
 431
 432COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
 433                       compat_ssize_t, msgsz, long, msgtyp, int, msgflg)
 434{
 435        return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, msgtyp,
 436                         msgflg, compat_do_msg_fill);
 437}
 438
 439static inline int get_compat_msqid64(struct msqid64_ds *m64,
 440                                     struct compat_msqid64_ds __user *up64)
 441{
 442        int err;
 443
 444        if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 445                return -EFAULT;
 446        err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 447        err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
 448        return err;
 449}
 450
 451static inline int get_compat_msqid(struct msqid64_ds *m,
 452                                   struct compat_msqid_ds __user *up)
 453{
 454        int err;
 455
 456        if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 457                return -EFAULT;
 458        err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 459        err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
 460        return err;
 461}
 462
 463static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
 464                                 struct compat_msqid64_ds __user *up64)
 465{
 466        int err;
 467
 468        if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 469                return -EFAULT;
 470        err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 471        err |= __put_user(m64->msg_stime, &up64->msg_stime);
 472        err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
 473        err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
 474        err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
 475        err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
 476        err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
 477        err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
 478        err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
 479        return err;
 480}
 481
 482static inline int put_compat_msqid_ds(struct msqid64_ds *m,
 483                                      struct compat_msqid_ds __user *up)
 484{
 485        int err;
 486
 487        if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 488                return -EFAULT;
 489        err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 490        err |= __put_user(m->msg_stime, &up->msg_stime);
 491        err |= __put_user(m->msg_rtime, &up->msg_rtime);
 492        err |= __put_user(m->msg_ctime, &up->msg_ctime);
 493        err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
 494        err |= __put_user(m->msg_qnum, &up->msg_qnum);
 495        err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
 496        err |= __put_user(m->msg_lspid, &up->msg_lspid);
 497        err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
 498        return err;
 499}
 500
 501long compat_sys_msgctl(int first, int second, void __user *uptr)
 502{
 503        int err, err2;
 504        struct msqid64_ds m64;
 505        int version = compat_ipc_parse_version(&second);
 506        void __user *p;
 507
 508        memset(&m64, 0, sizeof(m64));
 509
 510        switch (second & (~IPC_64)) {
 511        case IPC_INFO:
 512        case IPC_RMID:
 513        case MSG_INFO:
 514                err = sys_msgctl(first, second, uptr);
 515                break;
 516
 517        case IPC_SET:
 518                if (version == IPC_64) {
 519                        err = get_compat_msqid64(&m64, uptr);
 520                } else {
 521                        err = get_compat_msqid(&m64, uptr);
 522                }
 523                if (err)
 524                        break;
 525                p = compat_alloc_user_space(sizeof(m64));
 526                if (copy_to_user(p, &m64, sizeof(m64)))
 527                        err = -EFAULT;
 528                else
 529                        err = sys_msgctl(first, second, p);
 530                break;
 531
 532        case IPC_STAT:
 533        case MSG_STAT:
 534                p = compat_alloc_user_space(sizeof(m64));
 535                err = sys_msgctl(first, second, p);
 536                if (err < 0)
 537                        break;
 538                if (copy_from_user(&m64, p, sizeof(m64)))
 539                        err2 = -EFAULT;
 540                else if (version == IPC_64)
 541                        err2 = put_compat_msqid64_ds(&m64, uptr);
 542                else
 543                        err2 = put_compat_msqid_ds(&m64, uptr);
 544                if (err2)
 545                        err = -EFAULT;
 546                break;
 547
 548        default:
 549                err = -EINVAL;
 550                break;
 551        }
 552        return err;
 553}
 554
 555COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
 556{
 557        unsigned long ret;
 558        long err;
 559
 560        err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
 561        if (err)
 562                return err;
 563        force_successful_syscall_return();
 564        return (long)ret;
 565}
 566
 567static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
 568                                        struct compat_shmid64_ds __user *up64)
 569{
 570        if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 571                return -EFAULT;
 572        return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 573}
 574
 575static inline int get_compat_shmid_ds(struct shmid64_ds *s,
 576                                      struct compat_shmid_ds __user *up)
 577{
 578        if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 579                return -EFAULT;
 580        return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 581}
 582
 583static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
 584                                        struct compat_shmid64_ds __user *up64)
 585{
 586        int err;
 587
 588        if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 589                return -EFAULT;
 590        err  = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 591        err |= __put_user(s64->shm_atime, &up64->shm_atime);
 592        err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
 593        err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
 594        err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
 595        err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
 596        err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
 597        err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
 598        return err;
 599}
 600
 601static inline int put_compat_shmid_ds(struct shmid64_ds *s,
 602                                      struct compat_shmid_ds __user *up)
 603{
 604        int err;
 605
 606        if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 607                return -EFAULT;
 608        err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 609        err |= __put_user(s->shm_atime, &up->shm_atime);
 610        err |= __put_user(s->shm_dtime, &up->shm_dtime);
 611        err |= __put_user(s->shm_ctime, &up->shm_ctime);
 612        err |= __put_user(s->shm_segsz, &up->shm_segsz);
 613        err |= __put_user(s->shm_nattch, &up->shm_nattch);
 614        err |= __put_user(s->shm_cpid, &up->shm_cpid);
 615        err |= __put_user(s->shm_lpid, &up->shm_lpid);
 616        return err;
 617}
 618
 619static inline int put_compat_shminfo64(struct shminfo64 *smi,
 620                                       struct compat_shminfo64 __user *up64)
 621{
 622        int err;
 623
 624        if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 625                return -EFAULT;
 626        if (smi->shmmax > INT_MAX)
 627                smi->shmmax = INT_MAX;
 628        err  = __put_user(smi->shmmax, &up64->shmmax);
 629        err |= __put_user(smi->shmmin, &up64->shmmin);
 630        err |= __put_user(smi->shmmni, &up64->shmmni);
 631        err |= __put_user(smi->shmseg, &up64->shmseg);
 632        err |= __put_user(smi->shmall, &up64->shmall);
 633        return err;
 634}
 635
 636static inline int put_compat_shminfo(struct shminfo64 *smi,
 637                                     struct shminfo __user *up)
 638{
 639        int err;
 640
 641        if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 642                return -EFAULT;
 643        if (smi->shmmax > INT_MAX)
 644                smi->shmmax = INT_MAX;
 645        err  = __put_user(smi->shmmax, &up->shmmax);
 646        err |= __put_user(smi->shmmin, &up->shmmin);
 647        err |= __put_user(smi->shmmni, &up->shmmni);
 648        err |= __put_user(smi->shmseg, &up->shmseg);
 649        err |= __put_user(smi->shmall, &up->shmall);
 650        return err;
 651}
 652
 653static inline int put_compat_shm_info(struct shm_info __user *ip,
 654                                      struct compat_shm_info __user *uip)
 655{
 656        int err;
 657        struct shm_info si;
 658
 659        if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
 660            copy_from_user(&si, ip, sizeof(si)))
 661                return -EFAULT;
 662        err  = __put_user(si.used_ids, &uip->used_ids);
 663        err |= __put_user(si.shm_tot, &uip->shm_tot);
 664        err |= __put_user(si.shm_rss, &uip->shm_rss);
 665        err |= __put_user(si.shm_swp, &uip->shm_swp);
 666        err |= __put_user(si.swap_attempts, &uip->swap_attempts);
 667        err |= __put_user(si.swap_successes, &uip->swap_successes);
 668        return err;
 669}
 670
 671long compat_sys_shmctl(int first, int second, void __user *uptr)
 672{
 673        void __user *p;
 674        struct shmid64_ds s64;
 675        struct shminfo64 smi;
 676        int err, err2;
 677        int version = compat_ipc_parse_version(&second);
 678
 679        memset(&s64, 0, sizeof(s64));
 680
 681        switch (second & (~IPC_64)) {
 682        case IPC_RMID:
 683        case SHM_LOCK:
 684        case SHM_UNLOCK:
 685                err = sys_shmctl(first, second, uptr);
 686                break;
 687
 688        case IPC_INFO:
 689                p = compat_alloc_user_space(sizeof(smi));
 690                err = sys_shmctl(first, second, p);
 691                if (err < 0)
 692                        break;
 693                if (copy_from_user(&smi, p, sizeof(smi)))
 694                        err2 = -EFAULT;
 695                else if (version == IPC_64)
 696                        err2 = put_compat_shminfo64(&smi, uptr);
 697                else
 698                        err2 = put_compat_shminfo(&smi, uptr);
 699                if (err2)
 700                        err = -EFAULT;
 701                break;
 702
 703
 704        case IPC_SET:
 705                if (version == IPC_64) {
 706                        err = get_compat_shmid64_ds(&s64, uptr);
 707                } else {
 708                        err = get_compat_shmid_ds(&s64, uptr);
 709                }
 710                if (err)
 711                        break;
 712                p = compat_alloc_user_space(sizeof(s64));
 713                if (copy_to_user(p, &s64, sizeof(s64)))
 714                        err = -EFAULT;
 715                else
 716                        err = sys_shmctl(first, second, p);
 717                break;
 718
 719        case IPC_STAT:
 720        case SHM_STAT:
 721                p = compat_alloc_user_space(sizeof(s64));
 722                err = sys_shmctl(first, second, p);
 723                if (err < 0)
 724                        break;
 725                if (copy_from_user(&s64, p, sizeof(s64)))
 726                        err2 = -EFAULT;
 727                else if (version == IPC_64)
 728                        err2 = put_compat_shmid64_ds(&s64, uptr);
 729                else
 730                        err2 = put_compat_shmid_ds(&s64, uptr);
 731                if (err2)
 732                        err = -EFAULT;
 733                break;
 734
 735        case SHM_INFO:
 736                p = compat_alloc_user_space(sizeof(struct shm_info));
 737                err = sys_shmctl(first, second, p);
 738                if (err < 0)
 739                        break;
 740                err2 = put_compat_shm_info(p, uptr);
 741                if (err2)
 742                        err = -EFAULT;
 743                break;
 744
 745        default:
 746                err = -EINVAL;
 747                break;
 748        }
 749        return err;
 750}
 751
 752long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 753                unsigned nsops, const struct compat_timespec __user *timeout)
 754{
 755        struct timespec __user *ts64 = NULL;
 756        if (timeout) {
 757                struct timespec ts;
 758                ts64 = compat_alloc_user_space(sizeof(*ts64));
 759                if (get_compat_timespec(&ts, timeout))
 760                        return -EFAULT;
 761                if (copy_to_user(ts64, &ts, sizeof(ts)))
 762                        return -EFAULT;
 763        }
 764        return sys_semtimedop(semid, tsems, nsops, ts64);
 765}
 766
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