net/compat.c

   1 /*
   2  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3  *
   4  * Copyright (C) 2000           VA Linux Co
   5  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9  * Copyright (C) 2000           Hewlett-Packard Co.
  10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/gfp.h>
  16 #include <linux/fs.h>
  17 #include <linux/types.h>
  18 #include <linux/file.h>
  19 #include <linux/icmpv6.h>
  20 #include <linux/socket.h>
  21 #include <linux/syscalls.h>
  22 #include <linux/filter.h>
  23 #include <linux/compat.h>
  24 #include <linux/security.h>
  25 #include <linux/export.h>
  26
  27 #include <net/scm.h>
  28 #include <net/sock.h>
  29 #include <net/ip.h>
  30 #include <net/ipv6.h>
  31 #include <asm/uaccess.h>
  32 #include <net/compat.h>
  33
  34 ssize_t get_compat_msghdr(struct msghdr *kmsg,
  35                           struct compat_msghdr __user *umsg,
  36                           struct sockaddr __user **save_addr,
  37                           struct iovec **iov)
  38 {
  39         compat_uptr_t uaddr, uiov, tmp3;
  40         ssize_t err;
  41
  42         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  43             __get_user(uaddr, &umsg->msg_name) ||
  44             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  45             __get_user(uiov, &umsg->msg_iov) ||
  46             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  47             __get_user(tmp3, &umsg->msg_control) ||
  48             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  49             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  50                 return -EFAULT;
  51         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  52                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  53         kmsg->msg_control = compat_ptr(tmp3);
  54
  55         if (save_addr)
  56                 *save_addr = compat_ptr(uaddr);
  57
  58         if (uaddr && kmsg->msg_namelen) {
  59                 if (!save_addr) {
  60                         err = move_addr_to_kernel(compat_ptr(uaddr),
  61                                                   kmsg->msg_namelen,
  62                                                   kmsg->msg_name);
  63                         if (err < 0)
  64                                 return err;
  65                 }
  66         } else {
  67                 kmsg->msg_name = NULL;
  68                 kmsg->msg_namelen = 0;
  69         }
  70
  71         if (kmsg->msg_iovlen > UIO_MAXIOV)
  72                 return -EMSGSIZE;
  73
  74         err = compat_rw_copy_check_uvector(save_addr ? READ : WRITE,
  75                                            compat_ptr(uiov), kmsg->msg_iovlen,
  76                                            UIO_FASTIOV, *iov, iov);
  77         if (err >= 0)
  78                 kmsg->msg_iov = *iov;
  79         return err;
  80 }
  81
  82 /* Bleech... */
  83 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  84
  85 #define CMSG_COMPAT_DATA(cmsg)                          \
  86         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
  87 #define CMSG_COMPAT_SPACE(len)                          \
  88         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
  89 #define CMSG_COMPAT_LEN(len)                            \
  90         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
  91
  92 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
  93         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
  94          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
  95          (struct compat_cmsghdr __user *)NULL)
  96
  97 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
  98         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
  99          (ucmlen) <= (unsigned long) \
 100          ((mhdr)->msg_controllen - \
 101           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 102
 103 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 104                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 105 {
 106         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 107         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 108                         msg->msg_controllen)
 109                 return NULL;
 110         return (struct compat_cmsghdr __user *)ptr;
 111 }
 112
 113 /* There is a lot of hair here because the alignment rules (and
 114  * thus placement) of cmsg headers and length are different for
 115  * 32-bit apps.  -DaveM
 116  */
 117 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 118                                unsigned char *stackbuf, int stackbuf_size)
 119 {
 120         struct compat_cmsghdr __user *ucmsg;
 121         struct cmsghdr *kcmsg, *kcmsg_base;
 122         compat_size_t ucmlen;
 123         __kernel_size_t kcmlen, tmp;
 124         int err = -EFAULT;
 125
 126         kcmlen = 0;
 127         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 128         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 129         while (ucmsg != NULL) {
 130                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 131                         return -EFAULT;
 132
 133                 /* Catch bogons. */
 134                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 135                         return -EINVAL;
 136
 137                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 138                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 139                 tmp = CMSG_ALIGN(tmp);
 140                 kcmlen += tmp;
 141                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 142         }
 143         if (kcmlen == 0)
 144                 return -EINVAL;
 145
 146         /* The kcmlen holds the 64-bit version of the control length.
 147          * It may not be modified as we do not stick it into the kmsg
 148          * until we have successfully copied over all of the data
 149          * from the user.
 150          */
 151         if (kcmlen > stackbuf_size)
 152                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 153         if (kcmsg == NULL)
 154                 return -ENOBUFS;
 155
 156         /* Now copy them over neatly. */
 157         memset(kcmsg, 0, kcmlen);
 158         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 159         while (ucmsg != NULL) {
 160                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 161                         goto Efault;
 162                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 163                         goto Einval;
 164                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 165                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 166                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 167                         goto Einval;
 168                 kcmsg->cmsg_len = tmp;
 169                 tmp = CMSG_ALIGN(tmp);
 170                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 171                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 172                     copy_from_user(CMSG_DATA(kcmsg),
 173                                    CMSG_COMPAT_DATA(ucmsg),
 174                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 175                         goto Efault;
 176
 177                 /* Advance. */
 178                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 179                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 180         }
 181
 182         /* Ok, looks like we made it.  Hook it up and return success. */
 183         kmsg->msg_control = kcmsg_base;
 184         kmsg->msg_controllen = kcmlen;
 185         return 0;
 186
 187 Einval:
 188         err = -EINVAL;
 189 Efault:
 190         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 191                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 192         return err;
 193 }
 194
 195 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 196 {
 197         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 198         struct compat_cmsghdr cmhdr;
 199         struct compat_timeval ctv;
 200         struct compat_timespec cts[3];
 201         int cmlen;
 202
 203         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 204                 kmsg->msg_flags |= MSG_CTRUNC;
 205                 return 0; /* XXX: return error? check spec. */
 206         }
 207
 208         if (!COMPAT_USE_64BIT_TIME) {
 209                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 210                         struct timeval *tv = (struct timeval *)data;
 211                         ctv.tv_sec = tv->tv_sec;
 212                         ctv.tv_usec = tv->tv_usec;
 213                         data = &ctv;
 214                         len = sizeof(ctv);
 215                 }
 216                 if (level == SOL_SOCKET &&
 217                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 218                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 219                         int i;
 220                         struct timespec *ts = (struct timespec *)data;
 221                         for (i = 0; i < count; i++) {
 222                                 cts[i].tv_sec = ts[i].tv_sec;
 223                                 cts[i].tv_nsec = ts[i].tv_nsec;
 224                         }
 225                         data = &cts;
 226                         len = sizeof(cts[0]) * count;
 227                 }
 228         }
 229
 230         cmlen = CMSG_COMPAT_LEN(len);
 231         if (kmsg->msg_controllen < cmlen) {
 232                 kmsg->msg_flags |= MSG_CTRUNC;
 233                 cmlen = kmsg->msg_controllen;
 234         }
 235         cmhdr.cmsg_level = level;
 236         cmhdr.cmsg_type = type;
 237         cmhdr.cmsg_len = cmlen;
 238
 239         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 240                 return -EFAULT;
 241         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 242                 return -EFAULT;
 243         cmlen = CMSG_COMPAT_SPACE(len);
 244         if (kmsg->msg_controllen < cmlen)
 245                 cmlen = kmsg->msg_controllen;
 246         kmsg->msg_control += cmlen;
 247         kmsg->msg_controllen -= cmlen;
 248         return 0;
 249 }
 250
 251 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 252 {
 253         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 254         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 255         int fdnum = scm->fp->count;
 256         struct file **fp = scm->fp->fp;
 257         int __user *cmfptr;
 258         int err = 0, i;
 259
 260         if (fdnum < fdmax)
 261                 fdmax = fdnum;
 262
 263         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 264                 int new_fd;
 265                 err = security_file_receive(fp[i]);
 266                 if (err)
 267                         break;
 268                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 269                                           ? O_CLOEXEC : 0);
 270                 if (err < 0)
 271                         break;
 272                 new_fd = err;
 273                 err = put_user(new_fd, cmfptr);
 274                 if (err) {
 275                         put_unused_fd(new_fd);
 276                         break;
 277                 }
 278                 /* Bump the usage count and install the file. */
 279                 fd_install(new_fd, get_file(fp[i]));
 280         }
 281
 282         if (i > 0) {
 283                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 284                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 285                 if (!err)
 286                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 287                 if (!err)
 288                         err = put_user(cmlen, &cm->cmsg_len);
 289                 if (!err) {
 290                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 291                         kmsg->msg_control += cmlen;
 292                         kmsg->msg_controllen -= cmlen;
 293                 }
 294         }
 295         if (i < fdnum)
 296                 kmsg->msg_flags |= MSG_CTRUNC;
 297
 298         /*
 299          * All of the files that fit in the message have had their
 300          * usage counts incremented, so we just free the list.
 301          */
 302         __scm_destroy(scm);
 303 }
 304
 305 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 306                                 char __user *optval, unsigned int optlen)
 307 {
 308         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 309         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 310         compat_uptr_t ptr;
 311         u16 len;
 312
 313         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 314             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 315             __get_user(len, &fprog32->len) ||
 316             __get_user(ptr, &fprog32->filter) ||
 317             __put_user(len, &kfprog->len) ||
 318             __put_user(compat_ptr(ptr), &kfprog->filter))
 319                 return -EFAULT;
 320
 321         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 322                               sizeof(struct sock_fprog));
 323 }
 324
 325 static int do_set_sock_timeout(struct socket *sock, int level,
 326                 int optname, char __user *optval, unsigned int optlen)
 327 {
 328         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 329         struct timeval ktime;
 330         mm_segment_t old_fs;
 331         int err;
 332
 333         if (optlen < sizeof(*up))
 334                 return -EINVAL;
 335         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 336             __get_user(ktime.tv_sec, &up->tv_sec) ||
 337             __get_user(ktime.tv_usec, &up->tv_usec))
 338                 return -EFAULT;
 339         old_fs = get_fs();
 340         set_fs(KERNEL_DS);
 341         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 342         set_fs(old_fs);
 343
 344         return err;
 345 }
 346
 347 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 348                                 char __user *optval, unsigned int optlen)
 349 {
 350         if (optname == SO_ATTACH_FILTER)
 351                 return do_set_attach_filter(sock, level, optname,
 352                                             optval, optlen);
 353         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 354                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 355
 356         return sock_setsockopt(sock, level, optname, optval, optlen);
 357 }
 358
 359 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 360                        char __user *, optval, unsigned int, optlen)
 361 {
 362         int err;
 363         struct socket *sock = sockfd_lookup(fd, &err);
 364
 365         if (sock) {
 366                 err = security_socket_setsockopt(sock, level, optname);
 367                 if (err) {
 368                         sockfd_put(sock);
 369                         return err;
 370                 }
 371
 372                 if (level == SOL_SOCKET)
 373                         err = compat_sock_setsockopt(sock, level,
 374                                         optname, optval, optlen);
 375                 else if (sock->ops->compat_setsockopt)
 376                         err = sock->ops->compat_setsockopt(sock, level,
 377                                         optname, optval, optlen);
 378                 else
 379                         err = sock->ops->setsockopt(sock, level,
 380                                         optname, optval, optlen);
 381                 sockfd_put(sock);
 382         }
 383         return err;
 384 }
 385
 386 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 387                 char __user *optval, int __user *optlen)
 388 {
 389         struct compat_timeval __user *up;
 390         struct timeval ktime;
 391         mm_segment_t old_fs;
 392         int len, err;
 393
 394         up = (struct compat_timeval __user *) optval;
 395         if (get_user(len, optlen))
 396                 return -EFAULT;
 397         if (len < sizeof(*up))
 398                 return -EINVAL;
 399         len = sizeof(ktime);
 400         old_fs = get_fs();
 401         set_fs(KERNEL_DS);
 402         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 403         set_fs(old_fs);
 404
 405         if (!err) {
 406                 if (put_user(sizeof(*up), optlen) ||
 407                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 408                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 409                     __put_user(ktime.tv_usec, &up->tv_usec))
 410                         err = -EFAULT;
 411         }
 412         return err;
 413 }
 414
 415 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 416                                 char __user *optval, int __user *optlen)
 417 {
 418         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 419                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 420         return sock_getsockopt(sock, level, optname, optval, optlen);
 421 }
 422
 423 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 424 {
 425         struct compat_timeval __user *ctv;
 426         int err;
 427         struct timeval tv;
 428
 429         if (COMPAT_USE_64BIT_TIME)
 430                 return sock_get_timestamp(sk, userstamp);
 431
 432         ctv = (struct compat_timeval __user *) userstamp;
 433         err = -ENOENT;
 434         if (!sock_flag(sk, SOCK_TIMESTAMP))
 435                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 436         tv = ktime_to_timeval(sk->sk_stamp);
 437         if (tv.tv_sec == -1)
 438                 return err;
 439         if (tv.tv_sec == 0) {
 440                 sk->sk_stamp = ktime_get_real();
 441                 tv = ktime_to_timeval(sk->sk_stamp);
 442         }
 443         err = 0;
 444         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 445                         put_user(tv.tv_usec, &ctv->tv_usec))
 446                 err = -EFAULT;
 447         return err;
 448 }
 449 EXPORT_SYMBOL(compat_sock_get_timestamp);
 450
 451 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 452 {
 453         struct compat_timespec __user *ctv;
 454         int err;
 455         struct timespec ts;
 456
 457         if (COMPAT_USE_64BIT_TIME)
 458                 return sock_get_timestampns (sk, userstamp);
 459
 460         ctv = (struct compat_timespec __user *) userstamp;
 461         err = -ENOENT;
 462         if (!sock_flag(sk, SOCK_TIMESTAMP))
 463                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 464         ts = ktime_to_timespec(sk->sk_stamp);
 465         if (ts.tv_sec == -1)
 466                 return err;
 467         if (ts.tv_sec == 0) {
 468                 sk->sk_stamp = ktime_get_real();
 469                 ts = ktime_to_timespec(sk->sk_stamp);
 470         }
 471         err = 0;
 472         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 473                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 474                 err = -EFAULT;
 475         return err;
 476 }
 477 EXPORT_SYMBOL(compat_sock_get_timestampns);
 478
 479 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 480                        char __user *, optval, int __user *, optlen)
 481 {
 482         int err;
 483         struct socket *sock = sockfd_lookup(fd, &err);
 484
 485         if (sock) {
 486                 err = security_socket_getsockopt(sock, level, optname);
 487                 if (err) {
 488                         sockfd_put(sock);
 489                         return err;
 490                 }
 491
 492                 if (level == SOL_SOCKET)
 493                         err = compat_sock_getsockopt(sock, level,
 494                                         optname, optval, optlen);
 495                 else if (sock->ops->compat_getsockopt)
 496                         err = sock->ops->compat_getsockopt(sock, level,
 497                                         optname, optval, optlen);
 498                 else
 499                         err = sock->ops->getsockopt(sock, level,
 500                                         optname, optval, optlen);
 501                 sockfd_put(sock);
 502         }
 503         return err;
 504 }
 505
 506 struct compat_group_req {
 507         __u32                            gr_interface;
 508         struct __kernel_sockaddr_storage gr_group
 509                 __attribute__ ((aligned(4)));
 510 } __packed;
 511
 512 struct compat_group_source_req {
 513         __u32                            gsr_interface;
 514         struct __kernel_sockaddr_storage gsr_group
 515                 __attribute__ ((aligned(4)));
 516         struct __kernel_sockaddr_storage gsr_source
 517                 __attribute__ ((aligned(4)));
 518 } __packed;
 519
 520 struct compat_group_filter {
 521         __u32                            gf_interface;
 522         struct __kernel_sockaddr_storage gf_group
 523                 __attribute__ ((aligned(4)));
 524         __u32                            gf_fmode;
 525         __u32                            gf_numsrc;
 526         struct __kernel_sockaddr_storage gf_slist[1]
 527                 __attribute__ ((aligned(4)));
 528 } __packed;
 529
 530 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 531                         sizeof(struct __kernel_sockaddr_storage))
 532
 533
 534 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 535         char __user *optval, unsigned int optlen,
 536         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 537 {
 538         char __user     *koptval = optval;
 539         int             koptlen = optlen;
 540
 541         switch (optname) {
 542         case MCAST_JOIN_GROUP:
 543         case MCAST_LEAVE_GROUP:
 544         {
 545                 struct compat_group_req __user *gr32 = (void *)optval;
 546                 struct group_req __user *kgr =
 547                         compat_alloc_user_space(sizeof(struct group_req));
 548                 u32 interface;
 549
 550                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 551                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 552                     __get_user(interface, &gr32->gr_interface) ||
 553                     __put_user(interface, &kgr->gr_interface) ||
 554                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 555                                 sizeof(kgr->gr_group)))
 556                         return -EFAULT;
 557                 koptval = (char __user *)kgr;
 558                 koptlen = sizeof(struct group_req);
 559                 break;
 560         }
 561         case MCAST_JOIN_SOURCE_GROUP:
 562         case MCAST_LEAVE_SOURCE_GROUP:
 563         case MCAST_BLOCK_SOURCE:
 564         case MCAST_UNBLOCK_SOURCE:
 565         {
 566                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 567                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 568                         sizeof(struct group_source_req));
 569                 u32 interface;
 570
 571                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 572                     !access_ok(VERIFY_WRITE, kgsr,
 573                         sizeof(struct group_source_req)) ||
 574                     __get_user(interface, &gsr32->gsr_interface) ||
 575                     __put_user(interface, &kgsr->gsr_interface) ||
 576                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 577                                 sizeof(kgsr->gsr_group)) ||
 578                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 579                                 sizeof(kgsr->gsr_source)))
 580                         return -EFAULT;
 581                 koptval = (char __user *)kgsr;
 582                 koptlen = sizeof(struct group_source_req);
 583                 break;
 584         }
 585         case MCAST_MSFILTER:
 586         {
 587                 struct compat_group_filter __user *gf32 = (void *)optval;
 588                 struct group_filter __user *kgf;
 589                 u32 interface, fmode, numsrc;
 590
 591                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 592                     __get_user(interface, &gf32->gf_interface) ||
 593                     __get_user(fmode, &gf32->gf_fmode) ||
 594                     __get_user(numsrc, &gf32->gf_numsrc))
 595                         return -EFAULT;
 596                 koptlen = optlen + sizeof(struct group_filter) -
 597                                 sizeof(struct compat_group_filter);
 598                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 599                         return -EINVAL;
 600                 kgf = compat_alloc_user_space(koptlen);
 601                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 602                     __put_user(interface, &kgf->gf_interface) ||
 603                     __put_user(fmode, &kgf->gf_fmode) ||
 604                     __put_user(numsrc, &kgf->gf_numsrc) ||
 605                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 606                                 sizeof(kgf->gf_group)) ||
 607                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 608                                 numsrc * sizeof(kgf->gf_slist[0]))))
 609                         return -EFAULT;
 610                 koptval = (char __user *)kgf;
 611                 break;
 612         }
 613
 614         default:
 615                 break;
 616         }
 617         return setsockopt(sock, level, optname, koptval, koptlen);
 618 }
 619 EXPORT_SYMBOL(compat_mc_setsockopt);
 620
 621 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 622         char __user *optval, int __user *optlen,
 623         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 624 {
 625         struct compat_group_filter __user *gf32 = (void *)optval;
 626         struct group_filter __user *kgf;
 627         int __user      *koptlen;
 628         u32 interface, fmode, numsrc;
 629         int klen, ulen, err;
 630
 631         if (optname != MCAST_MSFILTER)
 632                 return getsockopt(sock, level, optname, optval, optlen);
 633
 634         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 635         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 636             __get_user(ulen, optlen))
 637                 return -EFAULT;
 638
 639         /* adjust len for pad */
 640         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 641
 642         if (klen < GROUP_FILTER_SIZE(0))
 643                 return -EINVAL;
 644
 645         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 646             __put_user(klen, koptlen))
 647                 return -EFAULT;
 648
 649         /* have to allow space for previous compat_alloc_user_space, too */
 650         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 651
 652         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 653             __get_user(interface, &gf32->gf_interface) ||
 654             __get_user(fmode, &gf32->gf_fmode) ||
 655             __get_user(numsrc, &gf32->gf_numsrc) ||
 656             __put_user(interface, &kgf->gf_interface) ||
 657             __put_user(fmode, &kgf->gf_fmode) ||
 658             __put_user(numsrc, &kgf->gf_numsrc) ||
 659             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 660                 return -EFAULT;
 661
 662         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 663         if (err)
 664                 return err;
 665
 666         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 667             __get_user(klen, koptlen))
 668                 return -EFAULT;
 669
 670         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 671
 672         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 673             __put_user(ulen, optlen))
 674                 return -EFAULT;
 675
 676         if (!access_ok(VERIFY_READ, kgf, klen) ||
 677             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 678             __get_user(interface, &kgf->gf_interface) ||
 679             __get_user(fmode, &kgf->gf_fmode) ||
 680             __get_user(numsrc, &kgf->gf_numsrc) ||
 681             __put_user(interface, &gf32->gf_interface) ||
 682             __put_user(fmode, &gf32->gf_fmode) ||
 683             __put_user(numsrc, &gf32->gf_numsrc))
 684                 return -EFAULT;
 685         if (numsrc) {
 686                 int copylen;
 687
 688                 klen -= GROUP_FILTER_SIZE(0);
 689                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 690                 if (copylen > klen)
 691                         copylen = klen;
 692                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 693                         return -EFAULT;
 694         }
 695         return err;
 696 }
 697 EXPORT_SYMBOL(compat_mc_getsockopt);
 698
 699
 700 /* Argument list sizes for compat_sys_socketcall */
 701 #define AL(x) ((x) * sizeof(u32))
 702 static unsigned char nas[21] = {
 703         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 704         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 705         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 706         AL(4), AL(5), AL(4)
 707 };
 708 #undef AL
 709
 710 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 711 {
 712         if (flags & MSG_CMSG_COMPAT)
 713                 return -EINVAL;
 714         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 715 }
 716
 717 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 718                        unsigned int, vlen, unsigned int, flags)
 719 {
 720         if (flags & MSG_CMSG_COMPAT)
 721                 return -EINVAL;
 722         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 723                               flags | MSG_CMSG_COMPAT);
 724 }
 725
 726 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 727 {
 728         if (flags & MSG_CMSG_COMPAT)
 729                 return -EINVAL;
 730         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 731 }
 732
 733 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 734 {
 735         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 736 }
 737
 738 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 739                        unsigned int, flags, struct sockaddr __user *, addr,
 740                        int __user *, addrlen)
 741 {
 742         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 743 }
 744
 745 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 746                        unsigned int, vlen, unsigned int, flags,
 747                        struct compat_timespec __user *, timeout)
 748 {
 749         int datagrams;
 750         struct timespec ktspec;
 751
 752         if (flags & MSG_CMSG_COMPAT)
 753                 return -EINVAL;
 754
 755         if (timeout == NULL)
 756                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 757                                       flags | MSG_CMSG_COMPAT, NULL);
 758
 759         if (compat_get_timespec(&ktspec, timeout))
 760                 return -EFAULT;
 761
 762         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 763                                    flags | MSG_CMSG_COMPAT, &ktspec);
 764         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 765                 datagrams = -EFAULT;
 766
 767         return datagrams;
 768 }
 769
 770 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 771 {
 772         int ret;
 773         u32 a[6];
 774         u32 a0, a1;
 775
 776         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 777                 return -EINVAL;
 778         if (copy_from_user(a, args, nas[call]))
 779                 return -EFAULT;
 780         a0 = a[0];
 781         a1 = a[1];
 782
 783         switch (call) {
 784         case SYS_SOCKET:
 785                 ret = sys_socket(a0, a1, a[2]);
 786                 break;
 787         case SYS_BIND:
 788                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 789                 break;
 790         case SYS_CONNECT:
 791                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 792                 break;
 793         case SYS_LISTEN:
 794                 ret = sys_listen(a0, a1);
 795                 break;
 796         case SYS_ACCEPT:
 797                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 798                 break;
 799         case SYS_GETSOCKNAME:
 800                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 801                 break;
 802         case SYS_GETPEERNAME:
 803                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 804                 break;
 805         case SYS_SOCKETPAIR:
 806                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 807                 break;
 808         case SYS_SEND:
 809                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 810                 break;
 811         case SYS_SENDTO:
 812                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 813                 break;
 814         case SYS_RECV:
 815                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 816                 break;
 817         case SYS_RECVFROM:
 818                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 819                                           compat_ptr(a[4]), compat_ptr(a[5]));
 820                 break;
 821         case SYS_SHUTDOWN:
 822                 ret = sys_shutdown(a0, a1);
 823                 break;
 824         case SYS_SETSOCKOPT:
 825                 ret = compat_sys_setsockopt(a0, a1, a[2],
 826                                 compat_ptr(a[3]), a[4]);
 827                 break;
 828         case SYS_GETSOCKOPT:
 829                 ret = compat_sys_getsockopt(a0, a1, a[2],
 830                                 compat_ptr(a[3]), compat_ptr(a[4]));
 831                 break;
 832         case SYS_SENDMSG:
 833                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 834                 break;
 835         case SYS_SENDMMSG:
 836                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 837                 break;
 838         case SYS_RECVMSG:
 839                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 840                 break;
 841         case SYS_RECVMMSG:
 842                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 843                                           compat_ptr(a[4]));
 844                 break;
 845         case SYS_ACCEPT4:
 846                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 847                 break;
 848         default:
 849                 ret = -EINVAL;
 850                 break;
 851         }
 852         return ret;
 853 }