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