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