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  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
 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         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
 313 static 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
 332 COMPAT_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, (s32)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
 416 COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
 417 {
 418         return do_compat_semctl(semid, semnum, cmd, arg);
 419 }
 420
 421 COMPAT_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
 432 COMPAT_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
 439 static 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
 451 static 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
 463 static 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
 482 static 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
 501 long 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
 555 COMPAT_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
 567 static 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
 575 static 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
 583 static 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
 601 static 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
 619 static 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
 636 static 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
 653 static 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
 671 long 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
 752 long 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 }