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/fs.h>
  16 #include <linux/types.h>
  17 #include <linux/file.h>
  18 #include <linux/icmpv6.h>
  19 #include <linux/socket.h>
  20 #include <linux/syscalls.h>
  21 #include <linux/filter.h>
  22 #include <linux/compat.h>
  23 #include <linux/security.h>
  24
  25 #include <net/scm.h>
  26 #include <net/sock.h>
  27 #include <net/ip.h>
  28 #include <net/ipv6.h>
  29 #include <asm/uaccess.h>
  30 #include <net/compat.h>
  31
  32 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  33                                           struct compat_iovec __user *uiov32,
  34                                           int niov)
  35 {
  36         int tot_len = 0;
  37
  38         while (niov > 0) {
  39                 compat_uptr_t buf;
  40                 compat_size_t len;
  41
  42                 if (get_user(len, &uiov32->iov_len) ||
  43                    get_user(buf, &uiov32->iov_base)) {
  44                         tot_len = -EFAULT;
  45                         break;
  46                 }
  47                 tot_len += len;
  48                 kiov->iov_base = compat_ptr(buf);
  49                 kiov->iov_len = (__kernel_size_t) len;
  50                 uiov32++;
  51                 kiov++;
  52                 niov--;
  53         }
  54         return tot_len;
  55 }
  56
  57 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  58 {
  59         compat_uptr_t tmp1, tmp2, tmp3;
  60
  61         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  62             __get_user(tmp1, &umsg->msg_name) ||
  63             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  64             __get_user(tmp2, &umsg->msg_iov) ||
  65             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  66             __get_user(tmp3, &umsg->msg_control) ||
  67             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  68             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  69                 return -EFAULT;
  70         kmsg->msg_name = compat_ptr(tmp1);
  71         kmsg->msg_iov = compat_ptr(tmp2);
  72         kmsg->msg_control = compat_ptr(tmp3);
  73         return 0;
  74 }
  75
  76 /* I've named the args so it is easy to tell whose space the pointers are in. */
  77 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  78                    struct sockaddr *kern_address, int mode)
  79 {
  80         int tot_len;
  81
  82         if (kern_msg->msg_namelen) {
  83                 if (mode==VERIFY_READ) {
  84                         int err = move_addr_to_kernel(kern_msg->msg_name,
  85                                                       kern_msg->msg_namelen,
  86                                                       kern_address);
  87                         if (err < 0)
  88                                 return err;
  89                 }
  90                 kern_msg->msg_name = kern_address;
  91         } else
  92                 kern_msg->msg_name = NULL;
  93
  94         tot_len = iov_from_user_compat_to_kern(kern_iov,
  95                                           (struct compat_iovec __user *)kern_msg->msg_iov,
  96                                           kern_msg->msg_iovlen);
  97         if (tot_len >= 0)
  98                 kern_msg->msg_iov = kern_iov;
  99
 100         return tot_len;
 101 }
 102
 103 /* Bleech... */
 104 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 105
 106 #define CMSG_COMPAT_DATA(cmsg)                          \
 107         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 108 #define CMSG_COMPAT_SPACE(len)                          \
 109         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 110 #define CMSG_COMPAT_LEN(len)                            \
 111         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 112
 113 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 114         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 115          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 116          (struct compat_cmsghdr __user *)NULL)
 117
 118 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 119         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 120          (ucmlen) <= (unsigned long) \
 121          ((mhdr)->msg_controllen - \
 122           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 123
 124 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 125                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 126 {
 127         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 128         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 129                         msg->msg_controllen)
 130                 return NULL;
 131         return (struct compat_cmsghdr __user *)ptr;
 132 }
 133
 134 /* There is a lot of hair here because the alignment rules (and
 135  * thus placement) of cmsg headers and length are different for
 136  * 32-bit apps.  -DaveM
 137  */
 138 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 139                                unsigned char *stackbuf, int stackbuf_size)
 140 {
 141         struct compat_cmsghdr __user *ucmsg;
 142         struct cmsghdr *kcmsg, *kcmsg_base;
 143         compat_size_t ucmlen;
 144         __kernel_size_t kcmlen, tmp;
 145         int err = -EFAULT;
 146
 147         kcmlen = 0;
 148         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 149         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 150         while (ucmsg != NULL) {
 151                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 152                         return -EFAULT;
 153
 154                 /* Catch bogons. */
 155                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 156                         return -EINVAL;
 157
 158                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 159                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 160                 tmp = CMSG_ALIGN(tmp);
 161                 kcmlen += tmp;
 162                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 163         }
 164         if (kcmlen == 0)
 165                 return -EINVAL;
 166
 167         /* The kcmlen holds the 64-bit version of the control length.
 168          * It may not be modified as we do not stick it into the kmsg
 169          * until we have successfully copied over all of the data
 170          * from the user.
 171          */
 172         if (kcmlen > stackbuf_size)
 173                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 174         if (kcmsg == NULL)
 175                 return -ENOBUFS;
 176
 177         /* Now copy them over neatly. */
 178         memset(kcmsg, 0, kcmlen);
 179         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 180         while (ucmsg != NULL) {
 181                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 182                         goto Efault;
 183                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 184                         goto Einval;
 185                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 186                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 187                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 188                         goto Einval;
 189                 kcmsg->cmsg_len = tmp;
 190                 tmp = CMSG_ALIGN(tmp);
 191                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 192                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 193                     copy_from_user(CMSG_DATA(kcmsg),
 194                                    CMSG_COMPAT_DATA(ucmsg),
 195                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 196                         goto Efault;
 197
 198                 /* Advance. */
 199                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 200                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 201         }
 202
 203         /* Ok, looks like we made it.  Hook it up and return success. */
 204         kmsg->msg_control = kcmsg_base;
 205         kmsg->msg_controllen = kcmlen;
 206         return 0;
 207
 208 Einval:
 209         err = -EINVAL;
 210 Efault:
 211         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 212                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 213         return err;
 214 }
 215
 216 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 217 {
 218         struct compat_timeval ctv;
 219         struct compat_timespec cts;
 220         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 221         struct compat_cmsghdr cmhdr;
 222         int cmlen;
 223
 224         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 225                 kmsg->msg_flags |= MSG_CTRUNC;
 226                 return 0; /* XXX: return error? check spec. */
 227         }
 228
 229         if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 230                 struct timeval *tv = (struct timeval *)data;
 231                 ctv.tv_sec = tv->tv_sec;
 232                 ctv.tv_usec = tv->tv_usec;
 233                 data = &ctv;
 234                 len = sizeof(ctv);
 235         }
 236         if (level == SOL_SOCKET && type == SCM_TIMESTAMPNS) {
 237                 struct timespec *ts = (struct timespec *)data;
 238                 cts.tv_sec = ts->tv_sec;
 239                 cts.tv_nsec = ts->tv_nsec;
 240                 data = &cts;
 241                 len = sizeof(cts);
 242         }
 243
 244         cmlen = CMSG_COMPAT_LEN(len);
 245         if (kmsg->msg_controllen < cmlen) {
 246                 kmsg->msg_flags |= MSG_CTRUNC;
 247                 cmlen = kmsg->msg_controllen;
 248         }
 249         cmhdr.cmsg_level = level;
 250         cmhdr.cmsg_type = type;
 251         cmhdr.cmsg_len = cmlen;
 252
 253         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 254                 return -EFAULT;
 255         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 256                 return -EFAULT;
 257         cmlen = CMSG_COMPAT_SPACE(len);
 258         if (kmsg->msg_controllen < cmlen)
 259                 cmlen = kmsg->msg_controllen;
 260         kmsg->msg_control += cmlen;
 261         kmsg->msg_controllen -= cmlen;
 262         return 0;
 263 }
 264
 265 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 266 {
 267         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 268         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 269         int fdnum = scm->fp->count;
 270         struct file **fp = scm->fp->fp;
 271         int __user *cmfptr;
 272         int err = 0, i;
 273
 274         if (fdnum < fdmax)
 275                 fdmax = fdnum;
 276
 277         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 278                 int new_fd;
 279                 err = security_file_receive(fp[i]);
 280                 if (err)
 281                         break;
 282                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 283                                           ? O_CLOEXEC : 0);
 284                 if (err < 0)
 285                         break;
 286                 new_fd = err;
 287                 err = put_user(new_fd, cmfptr);
 288                 if (err) {
 289                         put_unused_fd(new_fd);
 290                         break;
 291                 }
 292                 /* Bump the usage count and install the file. */
 293                 get_file(fp[i]);
 294                 fd_install(new_fd, fp[i]);
 295         }
 296
 297         if (i > 0) {
 298                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 299                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 300                 if (!err)
 301                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 302                 if (!err)
 303                         err = put_user(cmlen, &cm->cmsg_len);
 304                 if (!err) {
 305                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 306                         kmsg->msg_control += cmlen;
 307                         kmsg->msg_controllen -= cmlen;
 308                 }
 309         }
 310         if (i < fdnum)
 311                 kmsg->msg_flags |= MSG_CTRUNC;
 312
 313         /*
 314          * All of the files that fit in the message have had their
 315          * usage counts incremented, so we just free the list.
 316          */
 317         __scm_destroy(scm);
 318 }
 319
 320 /*
 321  * A struct sock_filter is architecture independent.
 322  */
 323 struct compat_sock_fprog {
 324         u16             len;
 325         compat_uptr_t   filter;         /* struct sock_filter * */
 326 };
 327
 328 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 329                                 char __user *optval, int optlen)
 330 {
 331         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 332         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 333         compat_uptr_t ptr;
 334         u16 len;
 335
 336         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 337             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 338             __get_user(len, &fprog32->len) ||
 339             __get_user(ptr, &fprog32->filter) ||
 340             __put_user(len, &kfprog->len) ||
 341             __put_user(compat_ptr(ptr), &kfprog->filter))
 342                 return -EFAULT;
 343
 344         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 345                               sizeof(struct sock_fprog));
 346 }
 347
 348 static int do_set_sock_timeout(struct socket *sock, int level,
 349                 int optname, char __user *optval, int optlen)
 350 {
 351         struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 352         struct timeval ktime;
 353         mm_segment_t old_fs;
 354         int err;
 355
 356         if (optlen < sizeof(*up))
 357                 return -EINVAL;
 358         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 359             __get_user(ktime.tv_sec, &up->tv_sec) ||
 360             __get_user(ktime.tv_usec, &up->tv_usec))
 361                 return -EFAULT;
 362         old_fs = get_fs();
 363         set_fs(KERNEL_DS);
 364         err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
 365         set_fs(old_fs);
 366
 367         return err;
 368 }
 369
 370 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 371                                 char __user *optval, int optlen)
 372 {
 373         if (optname == SO_ATTACH_FILTER)
 374                 return do_set_attach_filter(sock, level, optname,
 375                                             optval, optlen);
 376         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 377                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 378
 379         return sock_setsockopt(sock, level, optname, optval, optlen);
 380 }
 381
 382 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 383                                 char __user *optval, int optlen)
 384 {
 385         int err;
 386         struct socket *sock;
 387
 388         if (optlen < 0)
 389                 return -EINVAL;
 390
 391         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 392         {
 393                 err = security_socket_setsockopt(sock,level,optname);
 394                 if (err) {
 395                         sockfd_put(sock);
 396                         return err;
 397                 }
 398
 399                 if (level == SOL_SOCKET)
 400                         err = compat_sock_setsockopt(sock, level,
 401                                         optname, optval, optlen);
 402                 else if (sock->ops->compat_setsockopt)
 403                         err = sock->ops->compat_setsockopt(sock, level,
 404                                         optname, optval, optlen);
 405                 else
 406                         err = sock->ops->setsockopt(sock, level,
 407                                         optname, optval, optlen);
 408                 sockfd_put(sock);
 409         }
 410         return err;
 411 }
 412
 413 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 414                 char __user *optval, int __user *optlen)
 415 {
 416         struct compat_timeval __user *up;
 417         struct timeval ktime;
 418         mm_segment_t old_fs;
 419         int len, err;
 420
 421         up = (struct compat_timeval __user *) optval;
 422         if (get_user(len, optlen))
 423                 return -EFAULT;
 424         if (len < sizeof(*up))
 425                 return -EINVAL;
 426         len = sizeof(ktime);
 427         old_fs = get_fs();
 428         set_fs(KERNEL_DS);
 429         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 430         set_fs(old_fs);
 431
 432         if (!err) {
 433                 if (put_user(sizeof(*up), optlen) ||
 434                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 435                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 436                     __put_user(ktime.tv_usec, &up->tv_usec))
 437                         err = -EFAULT;
 438         }
 439         return err;
 440 }
 441
 442 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 443                                 char __user *optval, int __user *optlen)
 444 {
 445         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 446                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 447         return sock_getsockopt(sock, level, optname, optval, optlen);
 448 }
 449
 450 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 451 {
 452         struct compat_timeval __user *ctv =
 453                         (struct compat_timeval __user*) userstamp;
 454         int err = -ENOENT;
 455         struct timeval tv;
 456
 457         if (!sock_flag(sk, SOCK_TIMESTAMP))
 458                 sock_enable_timestamp(sk);
 459         tv = ktime_to_timeval(sk->sk_stamp);
 460         if (tv.tv_sec == -1)
 461                 return err;
 462         if (tv.tv_sec == 0) {
 463                 sk->sk_stamp = ktime_get_real();
 464                 tv = ktime_to_timeval(sk->sk_stamp);
 465         }
 466         err = 0;
 467         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 468                         put_user(tv.tv_usec, &ctv->tv_usec))
 469                 err = -EFAULT;
 470         return err;
 471 }
 472 EXPORT_SYMBOL(compat_sock_get_timestamp);
 473
 474 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 475 {
 476         struct compat_timespec __user *ctv =
 477                         (struct compat_timespec __user*) userstamp;
 478         int err = -ENOENT;
 479         struct timespec ts;
 480
 481         if (!sock_flag(sk, SOCK_TIMESTAMP))
 482                 sock_enable_timestamp(sk);
 483         ts = ktime_to_timespec(sk->sk_stamp);
 484         if (ts.tv_sec == -1)
 485                 return err;
 486         if (ts.tv_sec == 0) {
 487                 sk->sk_stamp = ktime_get_real();
 488                 ts = ktime_to_timespec(sk->sk_stamp);
 489         }
 490         err = 0;
 491         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 492                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 493                 err = -EFAULT;
 494         return err;
 495 }
 496 EXPORT_SYMBOL(compat_sock_get_timestampns);
 497
 498 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 499                                 char __user *optval, int __user *optlen)
 500 {
 501         int err;
 502         struct socket *sock;
 503
 504         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 505         {
 506                 err = security_socket_getsockopt(sock, level,
 507                                                            optname);
 508                 if (err) {
 509                         sockfd_put(sock);
 510                         return err;
 511                 }
 512
 513                 if (level == SOL_SOCKET)
 514                         err = compat_sock_getsockopt(sock, level,
 515                                         optname, optval, optlen);
 516                 else if (sock->ops->compat_getsockopt)
 517                         err = sock->ops->compat_getsockopt(sock, level,
 518                                         optname, optval, optlen);
 519                 else
 520                         err = sock->ops->getsockopt(sock, level,
 521                                         optname, optval, optlen);
 522                 sockfd_put(sock);
 523         }
 524         return err;
 525 }
 526
 527 struct compat_group_req {
 528         __u32                            gr_interface;
 529         struct __kernel_sockaddr_storage gr_group
 530                 __attribute__ ((aligned(4)));
 531 } __attribute__ ((packed));
 532
 533 struct compat_group_source_req {
 534         __u32                            gsr_interface;
 535         struct __kernel_sockaddr_storage gsr_group
 536                 __attribute__ ((aligned(4)));
 537         struct __kernel_sockaddr_storage gsr_source
 538                 __attribute__ ((aligned(4)));
 539 } __attribute__ ((packed));
 540
 541 struct compat_group_filter {
 542         __u32                            gf_interface;
 543         struct __kernel_sockaddr_storage gf_group
 544                 __attribute__ ((aligned(4)));
 545         __u32                            gf_fmode;
 546         __u32                            gf_numsrc;
 547         struct __kernel_sockaddr_storage gf_slist[1]
 548                 __attribute__ ((aligned(4)));
 549 } __attribute__ ((packed));
 550
 551 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 552                         sizeof(struct __kernel_sockaddr_storage))
 553
 554
 555 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 556         char __user *optval, int optlen,
 557         int (*setsockopt)(struct sock *,int,int,char __user *,int))
 558 {
 559         char __user     *koptval = optval;
 560         int             koptlen = optlen;
 561
 562         switch (optname) {
 563         case MCAST_JOIN_GROUP:
 564         case MCAST_LEAVE_GROUP:
 565         {
 566                 struct compat_group_req __user *gr32 = (void *)optval;
 567                 struct group_req __user *kgr =
 568                         compat_alloc_user_space(sizeof(struct group_req));
 569                 u32 interface;
 570
 571                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 572                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 573                     __get_user(interface, &gr32->gr_interface) ||
 574                     __put_user(interface, &kgr->gr_interface) ||
 575                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 576                                 sizeof(kgr->gr_group)))
 577                         return -EFAULT;
 578                 koptval = (char __user *)kgr;
 579                 koptlen = sizeof(struct group_req);
 580                 break;
 581         }
 582         case MCAST_JOIN_SOURCE_GROUP:
 583         case MCAST_LEAVE_SOURCE_GROUP:
 584         case MCAST_BLOCK_SOURCE:
 585         case MCAST_UNBLOCK_SOURCE:
 586         {
 587                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 588                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 589                         sizeof(struct group_source_req));
 590                 u32 interface;
 591
 592                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 593                     !access_ok(VERIFY_WRITE, kgsr,
 594                         sizeof(struct group_source_req)) ||
 595                     __get_user(interface, &gsr32->gsr_interface) ||
 596                     __put_user(interface, &kgsr->gsr_interface) ||
 597                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 598                                 sizeof(kgsr->gsr_group)) ||
 599                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 600                                 sizeof(kgsr->gsr_source)))
 601                         return -EFAULT;
 602                 koptval = (char __user *)kgsr;
 603                 koptlen = sizeof(struct group_source_req);
 604                 break;
 605         }
 606         case MCAST_MSFILTER:
 607         {
 608                 struct compat_group_filter __user *gf32 = (void *)optval;
 609                 struct group_filter __user *kgf;
 610                 u32 interface, fmode, numsrc;
 611
 612                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 613                     __get_user(interface, &gf32->gf_interface) ||
 614                     __get_user(fmode, &gf32->gf_fmode) ||
 615                     __get_user(numsrc, &gf32->gf_numsrc))
 616                         return -EFAULT;
 617                 koptlen = optlen + sizeof(struct group_filter) -
 618                                 sizeof(struct compat_group_filter);
 619                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 620                         return -EINVAL;
 621                 kgf = compat_alloc_user_space(koptlen);
 622                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 623                     __put_user(interface, &kgf->gf_interface) ||
 624                     __put_user(fmode, &kgf->gf_fmode) ||
 625                     __put_user(numsrc, &kgf->gf_numsrc) ||
 626                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 627                                 sizeof(kgf->gf_group)) ||
 628                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 629                                 numsrc * sizeof(kgf->gf_slist[0]))))
 630                         return -EFAULT;
 631                 koptval = (char __user *)kgf;
 632                 break;
 633         }
 634
 635         default:
 636                 break;
 637         }
 638         return setsockopt(sock, level, optname, koptval, koptlen);
 639 }
 640
 641 EXPORT_SYMBOL(compat_mc_setsockopt);
 642
 643 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 644         char __user *optval, int __user *optlen,
 645         int (*getsockopt)(struct sock *,int,int,char __user *,int __user *))
 646 {
 647         struct compat_group_filter __user *gf32 = (void *)optval;
 648         struct group_filter __user *kgf;
 649         int __user      *koptlen;
 650         u32 interface, fmode, numsrc;
 651         int klen, ulen, err;
 652
 653         if (optname != MCAST_MSFILTER)
 654                 return getsockopt(sock, level, optname, optval, optlen);
 655
 656         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 657         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 658             __get_user(ulen, optlen))
 659                 return -EFAULT;
 660
 661         /* adjust len for pad */
 662         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 663
 664         if (klen < GROUP_FILTER_SIZE(0))
 665                 return -EINVAL;
 666
 667         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 668             __put_user(klen, koptlen))
 669                 return -EFAULT;
 670
 671         /* have to allow space for previous compat_alloc_user_space, too */
 672         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 673
 674         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 675             __get_user(interface, &gf32->gf_interface) ||
 676             __get_user(fmode, &gf32->gf_fmode) ||
 677             __get_user(numsrc, &gf32->gf_numsrc) ||
 678             __put_user(interface, &kgf->gf_interface) ||
 679             __put_user(fmode, &kgf->gf_fmode) ||
 680             __put_user(numsrc, &kgf->gf_numsrc) ||
 681             copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group)))
 682                 return -EFAULT;
 683
 684         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 685         if (err)
 686                 return err;
 687
 688         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 689             __get_user(klen, koptlen))
 690                 return -EFAULT;
 691
 692         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 693
 694         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 695             __put_user(ulen, optlen))
 696                 return -EFAULT;
 697
 698         if (!access_ok(VERIFY_READ, kgf, klen) ||
 699             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 700             __get_user(interface, &kgf->gf_interface) ||
 701             __get_user(fmode, &kgf->gf_fmode) ||
 702             __get_user(numsrc, &kgf->gf_numsrc) ||
 703             __put_user(interface, &gf32->gf_interface) ||
 704             __put_user(fmode, &gf32->gf_fmode) ||
 705             __put_user(numsrc, &gf32->gf_numsrc))
 706                 return -EFAULT;
 707         if (numsrc) {
 708                 int copylen;
 709
 710                 klen -= GROUP_FILTER_SIZE(0);
 711                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 712                 if (copylen > klen)
 713                         copylen = klen;
 714                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 715                         return -EFAULT;
 716         }
 717         return err;
 718 }
 719
 720 EXPORT_SYMBOL(compat_mc_getsockopt);
 721
 722
 723 /* Argument list sizes for compat_sys_socketcall */
 724 #define AL(x) ((x) * sizeof(u32))
 725 static unsigned char nas[19]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 726                                 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 727                                 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
 728                                 AL(4)};
 729 #undef AL
 730
 731 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 732 {
 733         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 734 }
 735
 736 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 737 {
 738         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 739 }
 740
 741 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 742 {
 743         int ret;
 744         u32 a[6];
 745         u32 a0, a1;
 746
 747         if (call < SYS_SOCKET || call > SYS_ACCEPT4)
 748                 return -EINVAL;
 749         if (copy_from_user(a, args, nas[call]))
 750                 return -EFAULT;
 751         a0 = a[0];
 752         a1 = a[1];
 753
 754         switch (call) {
 755         case SYS_SOCKET:
 756                 ret = sys_socket(a0, a1, a[2]);
 757                 break;
 758         case SYS_BIND:
 759                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 760                 break;
 761         case SYS_CONNECT:
 762                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 763                 break;
 764         case SYS_LISTEN:
 765                 ret = sys_listen(a0, a1);
 766                 break;
 767         case SYS_ACCEPT:
 768                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 769                 break;
 770         case SYS_GETSOCKNAME:
 771                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 772                 break;
 773         case SYS_GETPEERNAME:
 774                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 775                 break;
 776         case SYS_SOCKETPAIR:
 777                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 778                 break;
 779         case SYS_SEND:
 780                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 781                 break;
 782         case SYS_SENDTO:
 783                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 784                 break;
 785         case SYS_RECV:
 786                 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 787                 break;
 788         case SYS_RECVFROM:
 789                 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 790                 break;
 791         case SYS_SHUTDOWN:
 792                 ret = sys_shutdown(a0,a1);
 793                 break;
 794         case SYS_SETSOCKOPT:
 795                 ret = compat_sys_setsockopt(a0, a1, a[2],
 796                                 compat_ptr(a[3]), a[4]);
 797                 break;
 798         case SYS_GETSOCKOPT:
 799                 ret = compat_sys_getsockopt(a0, a1, a[2],
 800                                 compat_ptr(a[3]), compat_ptr(a[4]));
 801                 break;
 802         case SYS_SENDMSG:
 803                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 804                 break;
 805         case SYS_RECVMSG:
 806                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 807                 break;
 808         case SYS_ACCEPT4:
 809                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 810                 break;
 811         default:
 812                 ret = -EINVAL;
 813                 break;
 814         }
 815         return ret;
 816 }