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
  26 #include <net/scm.h>
  27 #include <net/sock.h>
  28 #include <net/ip.h>
  29 #include <net/ipv6.h>
  30 #include <asm/uaccess.h>
  31 #include <net/compat.h>
  32
  33 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  34                                           struct compat_iovec __user *uiov32,
  35                                           int niov)
  36 {
  37         int tot_len = 0;
  38
  39         while (niov > 0) {
  40                 compat_uptr_t buf;
  41                 compat_size_t len;
  42
  43                 if (get_user(len, &uiov32->iov_len) ||
  44                    get_user(buf, &uiov32->iov_base)) {
  45                         tot_len = -EFAULT;
  46                         break;
  47                 }
  48                 tot_len += len;
  49                 kiov->iov_base = compat_ptr(buf);
  50                 kiov->iov_len = (__kernel_size_t) len;
  51                 uiov32++;
  52                 kiov++;
  53                 niov--;
  54         }
  55         return tot_len;
  56 }
  57
  58 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  59 {
  60         compat_uptr_t tmp1, tmp2, tmp3;
  61
  62         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  63             __get_user(tmp1, &umsg->msg_name) ||
  64             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  65             __get_user(tmp2, &umsg->msg_iov) ||
  66             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  67             __get_user(tmp3, &umsg->msg_control) ||
  68             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  69             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  70                 return -EFAULT;
  71         kmsg->msg_name = compat_ptr(tmp1);
  72         kmsg->msg_iov = compat_ptr(tmp2);
  73         kmsg->msg_control = compat_ptr(tmp3);
  74         return 0;
  75 }
  76
  77 /* I've named the args so it is easy to tell whose space the pointers are in. */
  78 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  79                    struct sockaddr *kern_address, int mode)
  80 {
  81         int tot_len;
  82
  83         if (kern_msg->msg_namelen) {
  84                 if (mode == VERIFY_READ) {
  85                         int err = move_addr_to_kernel(kern_msg->msg_name,
  86                                                       kern_msg->msg_namelen,
  87                                                       kern_address);
  88                         if (err < 0)
  89                                 return err;
  90                 }
  91                 kern_msg->msg_name = kern_address;
  92         } else
  93                 kern_msg->msg_name = NULL;
  94
  95         tot_len = iov_from_user_compat_to_kern(kern_iov,
  96                                           (struct compat_iovec __user *)kern_msg->msg_iov,
  97                                           kern_msg->msg_iovlen);
  98         if (tot_len >= 0)
  99                 kern_msg->msg_iov = kern_iov;
 100
 101         return tot_len;
 102 }
 103
 104 /* Bleech... */
 105 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 106
 107 #define CMSG_COMPAT_DATA(cmsg)                          \
 108         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 109 #define CMSG_COMPAT_SPACE(len)                          \
 110         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 111 #define CMSG_COMPAT_LEN(len)                            \
 112         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 113
 114 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 115         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 116          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 117          (struct compat_cmsghdr __user *)NULL)
 118
 119 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 120         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 121          (ucmlen) <= (unsigned long) \
 122          ((mhdr)->msg_controllen - \
 123           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 124
 125 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 126                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 127 {
 128         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 129         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 130                         msg->msg_controllen)
 131                 return NULL;
 132         return (struct compat_cmsghdr __user *)ptr;
 133 }
 134
 135 /* There is a lot of hair here because the alignment rules (and
 136  * thus placement) of cmsg headers and length are different for
 137  * 32-bit apps.  -DaveM
 138  */
 139 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 140                                unsigned char *stackbuf, int stackbuf_size)
 141 {
 142         struct compat_cmsghdr __user *ucmsg;
 143         struct cmsghdr *kcmsg, *kcmsg_base;
 144         compat_size_t ucmlen;
 145         __kernel_size_t kcmlen, tmp;
 146         int err = -EFAULT;
 147
 148         kcmlen = 0;
 149         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 150         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 151         while (ucmsg != NULL) {
 152                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 153                         return -EFAULT;
 154
 155                 /* Catch bogons. */
 156                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 157                         return -EINVAL;
 158
 159                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 160                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 161                 tmp = CMSG_ALIGN(tmp);
 162                 kcmlen += tmp;
 163                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 164         }
 165         if (kcmlen == 0)
 166                 return -EINVAL;
 167
 168         /* The kcmlen holds the 64-bit version of the control length.
 169          * It may not be modified as we do not stick it into the kmsg
 170          * until we have successfully copied over all of the data
 171          * from the user.
 172          */
 173         if (kcmlen > stackbuf_size)
 174                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 175         if (kcmsg == NULL)
 176                 return -ENOBUFS;
 177
 178         /* Now copy them over neatly. */
 179         memset(kcmsg, 0, kcmlen);
 180         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 181         while (ucmsg != NULL) {
 182                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 183                         goto Efault;
 184                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 185                         goto Einval;
 186                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 187                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 188                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 189                         goto Einval;
 190                 kcmsg->cmsg_len = tmp;
 191                 tmp = CMSG_ALIGN(tmp);
 192                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 193                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 194                     copy_from_user(CMSG_DATA(kcmsg),
 195                                    CMSG_COMPAT_DATA(ucmsg),
 196                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 197                         goto Efault;
 198
 199                 /* Advance. */
 200                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 201                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 202         }
 203
 204         /* Ok, looks like we made it.  Hook it up and return success. */
 205         kmsg->msg_control = kcmsg_base;
 206         kmsg->msg_controllen = kcmlen;
 207         return 0;
 208
 209 Einval:
 210         err = -EINVAL;
 211 Efault:
 212         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 213                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 214         return err;
 215 }
 216
 217 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 218 {
 219         struct compat_timeval ctv;
 220         struct compat_timespec cts[3];
 221         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 222         struct compat_cmsghdr cmhdr;
 223         int cmlen;
 224
 225         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 226                 kmsg->msg_flags |= MSG_CTRUNC;
 227                 return 0; /* XXX: return error? check spec. */
 228         }
 229
 230         if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 231                 struct timeval *tv = (struct timeval *)data;
 232                 ctv.tv_sec = tv->tv_sec;
 233                 ctv.tv_usec = tv->tv_usec;
 234                 data = &ctv;
 235                 len = sizeof(ctv);
 236         }
 237         if (level == SOL_SOCKET &&
 238             (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 239                 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 240                 int i;
 241                 struct timespec *ts = (struct timespec *)data;
 242                 for (i = 0; i < count; i++) {
 243                         cts[i].tv_sec = ts[i].tv_sec;
 244                         cts[i].tv_nsec = ts[i].tv_nsec;
 245                 }
 246                 data = &cts;
 247                 len = sizeof(cts[0]) * count;
 248         }
 249
 250         cmlen = CMSG_COMPAT_LEN(len);
 251         if (kmsg->msg_controllen < cmlen) {
 252                 kmsg->msg_flags |= MSG_CTRUNC;
 253                 cmlen = kmsg->msg_controllen;
 254         }
 255         cmhdr.cmsg_level = level;
 256         cmhdr.cmsg_type = type;
 257         cmhdr.cmsg_len = cmlen;
 258
 259         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 260                 return -EFAULT;
 261         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 262                 return -EFAULT;
 263         cmlen = CMSG_COMPAT_SPACE(len);
 264         if (kmsg->msg_controllen < cmlen)
 265                 cmlen = kmsg->msg_controllen;
 266         kmsg->msg_control += cmlen;
 267         kmsg->msg_controllen -= cmlen;
 268         return 0;
 269 }
 270
 271 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 272 {
 273         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 274         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 275         int fdnum = scm->fp->count;
 276         struct file **fp = scm->fp->fp;
 277         int __user *cmfptr;
 278         int err = 0, i;
 279
 280         if (fdnum < fdmax)
 281                 fdmax = fdnum;
 282
 283         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 284                 int new_fd;
 285                 err = security_file_receive(fp[i]);
 286                 if (err)
 287                         break;
 288                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 289                                           ? O_CLOEXEC : 0);
 290                 if (err < 0)
 291                         break;
 292                 new_fd = err;
 293                 err = put_user(new_fd, cmfptr);
 294                 if (err) {
 295                         put_unused_fd(new_fd);
 296                         break;
 297                 }
 298                 /* Bump the usage count and install the file. */
 299                 get_file(fp[i]);
 300                 fd_install(new_fd, fp[i]);
 301         }
 302
 303         if (i > 0) {
 304                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 305                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 306                 if (!err)
 307                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 308                 if (!err)
 309                         err = put_user(cmlen, &cm->cmsg_len);
 310                 if (!err) {
 311                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 312                         kmsg->msg_control += cmlen;
 313                         kmsg->msg_controllen -= cmlen;
 314                 }
 315         }
 316         if (i < fdnum)
 317                 kmsg->msg_flags |= MSG_CTRUNC;
 318
 319         /*
 320          * All of the files that fit in the message have had their
 321          * usage counts incremented, so we just free the list.
 322          */
 323         __scm_destroy(scm);
 324 }
 325
 326 /*
 327  * A struct sock_filter is architecture independent.
 328  */
 329 struct compat_sock_fprog {
 330         u16             len;
 331         compat_uptr_t   filter;         /* struct sock_filter * */
 332 };
 333
 334 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 335                                 char __user *optval, unsigned int optlen)
 336 {
 337         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 338         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 339         compat_uptr_t ptr;
 340         u16 len;
 341
 342         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 343             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 344             __get_user(len, &fprog32->len) ||
 345             __get_user(ptr, &fprog32->filter) ||
 346             __put_user(len, &kfprog->len) ||
 347             __put_user(compat_ptr(ptr), &kfprog->filter))
 348                 return -EFAULT;
 349
 350         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 351                               sizeof(struct sock_fprog));
 352 }
 353
 354 static int do_set_sock_timeout(struct socket *sock, int level,
 355                 int optname, char __user *optval, unsigned int optlen)
 356 {
 357         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 358         struct timeval ktime;
 359         mm_segment_t old_fs;
 360         int err;
 361
 362         if (optlen < sizeof(*up))
 363                 return -EINVAL;
 364         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 365             __get_user(ktime.tv_sec, &up->tv_sec) ||
 366             __get_user(ktime.tv_usec, &up->tv_usec))
 367                 return -EFAULT;
 368         old_fs = get_fs();
 369         set_fs(KERNEL_DS);
 370         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 371         set_fs(old_fs);
 372
 373         return err;
 374 }
 375
 376 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 377                                 char __user *optval, unsigned int optlen)
 378 {
 379         if (optname == SO_ATTACH_FILTER)
 380                 return do_set_attach_filter(sock, level, optname,
 381                                             optval, optlen);
 382         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 383                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 384
 385         return sock_setsockopt(sock, level, optname, optval, optlen);
 386 }
 387
 388 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 389                                 char __user *optval, unsigned int optlen)
 390 {
 391         int err;
 392         struct socket *sock = sockfd_lookup(fd, &err);
 393
 394         if (sock) {
 395                 err = security_socket_setsockopt(sock, level, optname);
 396                 if (err) {
 397                         sockfd_put(sock);
 398                         return err;
 399                 }
 400
 401                 if (level == SOL_SOCKET)
 402                         err = compat_sock_setsockopt(sock, level,
 403                                         optname, optval, optlen);
 404                 else if (sock->ops->compat_setsockopt)
 405                         err = sock->ops->compat_setsockopt(sock, level,
 406                                         optname, optval, optlen);
 407                 else
 408                         err = sock->ops->setsockopt(sock, level,
 409                                         optname, optval, optlen);
 410                 sockfd_put(sock);
 411         }
 412         return err;
 413 }
 414
 415 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 416                 char __user *optval, int __user *optlen)
 417 {
 418         struct compat_timeval __user *up;
 419         struct timeval ktime;
 420         mm_segment_t old_fs;
 421         int len, err;
 422
 423         up = (struct compat_timeval __user *) optval;
 424         if (get_user(len, optlen))
 425                 return -EFAULT;
 426         if (len < sizeof(*up))
 427                 return -EINVAL;
 428         len = sizeof(ktime);
 429         old_fs = get_fs();
 430         set_fs(KERNEL_DS);
 431         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 432         set_fs(old_fs);
 433
 434         if (!err) {
 435                 if (put_user(sizeof(*up), optlen) ||
 436                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 437                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 438                     __put_user(ktime.tv_usec, &up->tv_usec))
 439                         err = -EFAULT;
 440         }
 441         return err;
 442 }
 443
 444 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 445                                 char __user *optval, int __user *optlen)
 446 {
 447         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 448                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 449         return sock_getsockopt(sock, level, optname, optval, optlen);
 450 }
 451
 452 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 453 {
 454         struct compat_timeval __user *ctv =
 455                         (struct compat_timeval __user *) userstamp;
 456         int err = -ENOENT;
 457         struct timeval tv;
 458
 459         if (!sock_flag(sk, SOCK_TIMESTAMP))
 460                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 461         tv = ktime_to_timeval(sk->sk_stamp);
 462         if (tv.tv_sec == -1)
 463                 return err;
 464         if (tv.tv_sec == 0) {
 465                 sk->sk_stamp = ktime_get_real();
 466                 tv = ktime_to_timeval(sk->sk_stamp);
 467         }
 468         err = 0;
 469         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 470                         put_user(tv.tv_usec, &ctv->tv_usec))
 471                 err = -EFAULT;
 472         return err;
 473 }
 474 EXPORT_SYMBOL(compat_sock_get_timestamp);
 475
 476 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 477 {
 478         struct compat_timespec __user *ctv =
 479                         (struct compat_timespec __user *) userstamp;
 480         int err = -ENOENT;
 481         struct timespec ts;
 482
 483         if (!sock_flag(sk, SOCK_TIMESTAMP))
 484                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 485         ts = ktime_to_timespec(sk->sk_stamp);
 486         if (ts.tv_sec == -1)
 487                 return err;
 488         if (ts.tv_sec == 0) {
 489                 sk->sk_stamp = ktime_get_real();
 490                 ts = ktime_to_timespec(sk->sk_stamp);
 491         }
 492         err = 0;
 493         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 494                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 495                 err = -EFAULT;
 496         return err;
 497 }
 498 EXPORT_SYMBOL(compat_sock_get_timestampns);
 499
 500 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 501                                 char __user *optval, int __user *optlen)
 502 {
 503         int err;
 504         struct socket *sock = sockfd_lookup(fd, &err);
 505
 506         if (sock) {
 507                 err = security_socket_getsockopt(sock, level, 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 } __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 } __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 } __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, unsigned int optlen,
 557         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned 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 EXPORT_SYMBOL(compat_mc_setsockopt);
 641
 642 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 643         char __user *optval, int __user *optlen,
 644         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 645 {
 646         struct compat_group_filter __user *gf32 = (void *)optval;
 647         struct group_filter __user *kgf;
 648         int __user      *koptlen;
 649         u32 interface, fmode, numsrc;
 650         int klen, ulen, err;
 651
 652         if (optname != MCAST_MSFILTER)
 653                 return getsockopt(sock, level, optname, optval, optlen);
 654
 655         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 656         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 657             __get_user(ulen, optlen))
 658                 return -EFAULT;
 659
 660         /* adjust len for pad */
 661         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 662
 663         if (klen < GROUP_FILTER_SIZE(0))
 664                 return -EINVAL;
 665
 666         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 667             __put_user(klen, koptlen))
 668                 return -EFAULT;
 669
 670         /* have to allow space for previous compat_alloc_user_space, too */
 671         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 672
 673         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 674             __get_user(interface, &gf32->gf_interface) ||
 675             __get_user(fmode, &gf32->gf_fmode) ||
 676             __get_user(numsrc, &gf32->gf_numsrc) ||
 677             __put_user(interface, &kgf->gf_interface) ||
 678             __put_user(fmode, &kgf->gf_fmode) ||
 679             __put_user(numsrc, &kgf->gf_numsrc) ||
 680             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 681                 return -EFAULT;
 682
 683         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 684         if (err)
 685                 return err;
 686
 687         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 688             __get_user(klen, koptlen))
 689                 return -EFAULT;
 690
 691         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 692
 693         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 694             __put_user(ulen, optlen))
 695                 return -EFAULT;
 696
 697         if (!access_ok(VERIFY_READ, kgf, klen) ||
 698             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 699             __get_user(interface, &kgf->gf_interface) ||
 700             __get_user(fmode, &kgf->gf_fmode) ||
 701             __get_user(numsrc, &kgf->gf_numsrc) ||
 702             __put_user(interface, &gf32->gf_interface) ||
 703             __put_user(fmode, &gf32->gf_fmode) ||
 704             __put_user(numsrc, &gf32->gf_numsrc))
 705                 return -EFAULT;
 706         if (numsrc) {
 707                 int copylen;
 708
 709                 klen -= GROUP_FILTER_SIZE(0);
 710                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 711                 if (copylen > klen)
 712                         copylen = klen;
 713                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 714                         return -EFAULT;
 715         }
 716         return err;
 717 }
 718 EXPORT_SYMBOL(compat_mc_getsockopt);
 719
 720
 721 /* Argument list sizes for compat_sys_socketcall */
 722 #define AL(x) ((x) * sizeof(u32))
 723 static unsigned char nas[20] = {
 724         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 725         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 726         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 727         AL(4), AL(5)
 728 };
 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_recv(int fd, void __user *buf, size_t len, unsigned flags)
 742 {
 743         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 744 }
 745
 746 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 747                                     unsigned flags, struct sockaddr __user *addr,
 748                                     int __user *addrlen)
 749 {
 750         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 751 }
 752
 753 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 754                                     unsigned vlen, unsigned int flags,
 755                                     struct compat_timespec __user *timeout)
 756 {
 757         int datagrams;
 758         struct timespec ktspec;
 759
 760         if (timeout == NULL)
 761                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 762                                       flags | MSG_CMSG_COMPAT, NULL);
 763
 764         if (get_compat_timespec(&ktspec, timeout))
 765                 return -EFAULT;
 766
 767         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 768                                    flags | MSG_CMSG_COMPAT, &ktspec);
 769         if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
 770                 datagrams = -EFAULT;
 771
 772         return datagrams;
 773 }
 774
 775 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 776 {
 777         int ret;
 778         u32 a[6];
 779         u32 a0, a1;
 780
 781         if (call < SYS_SOCKET || call > SYS_RECVMMSG)
 782                 return -EINVAL;
 783         if (copy_from_user(a, args, nas[call]))
 784                 return -EFAULT;
 785         a0 = a[0];
 786         a1 = a[1];
 787
 788         switch (call) {
 789         case SYS_SOCKET:
 790                 ret = sys_socket(a0, a1, a[2]);
 791                 break;
 792         case SYS_BIND:
 793                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 794                 break;
 795         case SYS_CONNECT:
 796                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 797                 break;
 798         case SYS_LISTEN:
 799                 ret = sys_listen(a0, a1);
 800                 break;
 801         case SYS_ACCEPT:
 802                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 803                 break;
 804         case SYS_GETSOCKNAME:
 805                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 806                 break;
 807         case SYS_GETPEERNAME:
 808                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 809                 break;
 810         case SYS_SOCKETPAIR:
 811                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 812                 break;
 813         case SYS_SEND:
 814                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 815                 break;
 816         case SYS_SENDTO:
 817                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 818                 break;
 819         case SYS_RECV:
 820                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 821                 break;
 822         case SYS_RECVFROM:
 823                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 824                                           compat_ptr(a[4]), compat_ptr(a[5]));
 825                 break;
 826         case SYS_SHUTDOWN:
 827                 ret = sys_shutdown(a0, a1);
 828                 break;
 829         case SYS_SETSOCKOPT:
 830                 ret = compat_sys_setsockopt(a0, a1, a[2],
 831                                 compat_ptr(a[3]), a[4]);
 832                 break;
 833         case SYS_GETSOCKOPT:
 834                 ret = compat_sys_getsockopt(a0, a1, a[2],
 835                                 compat_ptr(a[3]), compat_ptr(a[4]));
 836                 break;
 837         case SYS_SENDMSG:
 838                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 839                 break;
 840         case SYS_RECVMSG:
 841                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 842                 break;
 843         case SYS_RECVMMSG:
 844                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 845                                           compat_ptr(a[4]));
 846                 break;
 847         case SYS_ACCEPT4:
 848                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 849                 break;
 850         default:
 851                 ret = -EINVAL;
 852                 break;
 853         }
 854         return ret;
 855 }