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/audit.h>
  26 #include <linux/export.h>
  27
  28 #include <net/scm.h>
  29 #include <net/sock.h>
  30 #include <net/ip.h>
  31 #include <net/ipv6.h>
  32 #include <linux/uaccess.h>
  33 #include <net/compat.h>
  34
  35 int get_compat_msghdr(struct msghdr *kmsg,
  36                       struct compat_msghdr __user *umsg,
  37                       struct sockaddr __user **save_addr,
  38                       struct iovec **iov)
  39 {
  40         compat_uptr_t uaddr, uiov, tmp3;
  41         compat_size_t nr_segs;
  42         ssize_t err;
  43
  44         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  45             __get_user(uaddr, &umsg->msg_name) ||
  46             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  47             __get_user(uiov, &umsg->msg_iov) ||
  48             __get_user(nr_segs, &umsg->msg_iovlen) ||
  49             __get_user(tmp3, &umsg->msg_control) ||
  50             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  51             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  52                 return -EFAULT;
  53
  54         if (!uaddr)
  55                 kmsg->msg_namelen = 0;
  56
  57         if (kmsg->msg_namelen < 0)
  58                 return -EINVAL;
  59
  60         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  61                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  62         kmsg->msg_control = compat_ptr(tmp3);
  63
  64         if (save_addr)
  65                 *save_addr = compat_ptr(uaddr);
  66
  67         if (uaddr && kmsg->msg_namelen) {
  68                 if (!save_addr) {
  69                         err = move_addr_to_kernel(compat_ptr(uaddr),
  70                                                   kmsg->msg_namelen,
  71                                                   kmsg->msg_name);
  72                         if (err < 0)
  73                                 return err;
  74                 }
  75         } else {
  76                 kmsg->msg_name = NULL;
  77                 kmsg->msg_namelen = 0;
  78         }
  79
  80         if (nr_segs > UIO_MAXIOV)
  81                 return -EMSGSIZE;
  82
  83         kmsg->msg_iocb = NULL;
  84
  85         return compat_import_iovec(save_addr ? READ : WRITE,
  86                                    compat_ptr(uiov), nr_segs,
  87                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
  88 }
  89
  90 /* Bleech... */
  91 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  92
  93 #define CMSG_COMPAT_DATA(cmsg)                          \
  94         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
  95 #define CMSG_COMPAT_SPACE(len)                          \
  96         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
  97 #define CMSG_COMPAT_LEN(len)                            \
  98         (sizeof(struct compat_cmsghdr) + (len))
  99
 100 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 101         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 102          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 103          (struct compat_cmsghdr __user *)NULL)
 104
 105 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 106         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 107          (ucmlen) <= (unsigned long) \
 108          ((mhdr)->msg_controllen - \
 109           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 110
 111 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 112                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 113 {
 114         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 115         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 116                         msg->msg_controllen)
 117                 return NULL;
 118         return (struct compat_cmsghdr __user *)ptr;
 119 }
 120
 121 /* There is a lot of hair here because the alignment rules (and
 122  * thus placement) of cmsg headers and length are different for
 123  * 32-bit apps.  -DaveM
 124  */
 125 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 126                                unsigned char *stackbuf, int stackbuf_size)
 127 {
 128         struct compat_cmsghdr __user *ucmsg;
 129         struct cmsghdr *kcmsg, *kcmsg_base;
 130         compat_size_t ucmlen;
 131         __kernel_size_t kcmlen, tmp;
 132         int err = -EFAULT;
 133
 134         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 135                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 136
 137         kcmlen = 0;
 138         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 139         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 140         while (ucmsg != NULL) {
 141                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 142                         return -EFAULT;
 143
 144                 /* Catch bogons. */
 145                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 146                         return -EINVAL;
 147
 148                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 149                 tmp = CMSG_ALIGN(tmp);
 150                 kcmlen += tmp;
 151                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 152         }
 153         if (kcmlen == 0)
 154                 return -EINVAL;
 155
 156         /* The kcmlen holds the 64-bit version of the control length.
 157          * It may not be modified as we do not stick it into the kmsg
 158          * until we have successfully copied over all of the data
 159          * from the user.
 160          */
 161         if (kcmlen > stackbuf_size)
 162                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 163         if (kcmsg == NULL)
 164                 return -ENOBUFS;
 165
 166         /* Now copy them over neatly. */
 167         memset(kcmsg, 0, kcmlen);
 168         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 169         while (ucmsg != NULL) {
 170                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 171                         goto Efault;
 172                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 173                         goto Einval;
 174                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 175                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 176                         goto Einval;
 177                 kcmsg->cmsg_len = tmp;
 178                 tmp = CMSG_ALIGN(tmp);
 179                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 180                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 181                     copy_from_user(CMSG_DATA(kcmsg),
 182                                    CMSG_COMPAT_DATA(ucmsg),
 183                                    (ucmlen - sizeof(*ucmsg))))
 184                         goto Efault;
 185
 186                 /* Advance. */
 187                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 188                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 189         }
 190
 191         /* Ok, looks like we made it.  Hook it up and return success. */
 192         kmsg->msg_control = kcmsg_base;
 193         kmsg->msg_controllen = kcmlen;
 194         return 0;
 195
 196 Einval:
 197         err = -EINVAL;
 198 Efault:
 199         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 200                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 201         return err;
 202 }
 203
 204 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 205 {
 206         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 207         struct compat_cmsghdr cmhdr;
 208         struct compat_timeval ctv;
 209         struct compat_timespec cts[3];
 210         int cmlen;
 211
 212         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 213                 kmsg->msg_flags |= MSG_CTRUNC;
 214                 return 0; /* XXX: return error? check spec. */
 215         }
 216
 217         if (!COMPAT_USE_64BIT_TIME) {
 218                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 219                         struct timeval *tv = (struct timeval *)data;
 220                         ctv.tv_sec = tv->tv_sec;
 221                         ctv.tv_usec = tv->tv_usec;
 222                         data = &ctv;
 223                         len = sizeof(ctv);
 224                 }
 225                 if (level == SOL_SOCKET &&
 226                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 227                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 228                         int i;
 229                         struct timespec *ts = (struct timespec *)data;
 230                         for (i = 0; i < count; i++) {
 231                                 cts[i].tv_sec = ts[i].tv_sec;
 232                                 cts[i].tv_nsec = ts[i].tv_nsec;
 233                         }
 234                         data = &cts;
 235                         len = sizeof(cts[0]) * count;
 236                 }
 237         }
 238
 239         cmlen = CMSG_COMPAT_LEN(len);
 240         if (kmsg->msg_controllen < cmlen) {
 241                 kmsg->msg_flags |= MSG_CTRUNC;
 242                 cmlen = kmsg->msg_controllen;
 243         }
 244         cmhdr.cmsg_level = level;
 245         cmhdr.cmsg_type = type;
 246         cmhdr.cmsg_len = cmlen;
 247
 248         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 249                 return -EFAULT;
 250         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 251                 return -EFAULT;
 252         cmlen = CMSG_COMPAT_SPACE(len);
 253         if (kmsg->msg_controllen < cmlen)
 254                 cmlen = kmsg->msg_controllen;
 255         kmsg->msg_control += cmlen;
 256         kmsg->msg_controllen -= cmlen;
 257         return 0;
 258 }
 259
 260 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 261 {
 262         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 263         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 264         int fdnum = scm->fp->count;
 265         struct file **fp = scm->fp->fp;
 266         int __user *cmfptr;
 267         int err = 0, i;
 268
 269         if (fdnum < fdmax)
 270                 fdmax = fdnum;
 271
 272         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 273                 int new_fd;
 274                 err = security_file_receive(fp[i]);
 275                 if (err)
 276                         break;
 277                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 278                                           ? O_CLOEXEC : 0);
 279                 if (err < 0)
 280                         break;
 281                 new_fd = err;
 282                 err = put_user(new_fd, cmfptr);
 283                 if (err) {
 284                         put_unused_fd(new_fd);
 285                         break;
 286                 }
 287                 /* Bump the usage count and install the file. */
 288                 fd_install(new_fd, get_file(fp[i]));
 289         }
 290
 291         if (i > 0) {
 292                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 293                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 294                 if (!err)
 295                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 296                 if (!err)
 297                         err = put_user(cmlen, &cm->cmsg_len);
 298                 if (!err) {
 299                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 300                         kmsg->msg_control += cmlen;
 301                         kmsg->msg_controllen -= cmlen;
 302                 }
 303         }
 304         if (i < fdnum)
 305                 kmsg->msg_flags |= MSG_CTRUNC;
 306
 307         /*
 308          * All of the files that fit in the message have had their
 309          * usage counts incremented, so we just free the list.
 310          */
 311         __scm_destroy(scm);
 312 }
 313
 314 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 315 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 316 {
 317         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 318         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 319         compat_uptr_t ptr;
 320         u16 len;
 321
 322         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 323             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 324             __get_user(len, &fprog32->len) ||
 325             __get_user(ptr, &fprog32->filter) ||
 326             __put_user(len, &kfprog->len) ||
 327             __put_user(compat_ptr(ptr), &kfprog->filter))
 328                 return NULL;
 329
 330         return kfprog;
 331 }
 332 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 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 sock_fprog __user *kfprog;
 338
 339         kfprog = get_compat_bpf_fprog(optval);
 340         if (!kfprog)
 341                 return -EFAULT;
 342
 343         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 344                               sizeof(struct sock_fprog));
 345 }
 346
 347 static int do_set_sock_timeout(struct socket *sock, int level,
 348                 int optname, char __user *optval, unsigned int optlen)
 349 {
 350         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 351         struct timeval ktime;
 352         mm_segment_t old_fs;
 353         int err;
 354
 355         if (optlen < sizeof(*up))
 356                 return -EINVAL;
 357         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 358             __get_user(ktime.tv_sec, &up->tv_sec) ||
 359             __get_user(ktime.tv_usec, &up->tv_usec))
 360                 return -EFAULT;
 361         old_fs = get_fs();
 362         set_fs(KERNEL_DS);
 363         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 364         set_fs(old_fs);
 365
 366         return err;
 367 }
 368
 369 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 370                                 char __user *optval, unsigned int optlen)
 371 {
 372         if (optname == SO_ATTACH_FILTER ||
 373             optname == SO_ATTACH_REUSEPORT_CBPF)
 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 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 383                        char __user *, optval, unsigned int, optlen)
 384 {
 385         int err;
 386         struct socket *sock = sockfd_lookup(fd, &err);
 387
 388         if (sock) {
 389                 err = security_socket_setsockopt(sock, level, optname);
 390                 if (err) {
 391                         sockfd_put(sock);
 392                         return err;
 393                 }
 394
 395                 if (level == SOL_SOCKET)
 396                         err = compat_sock_setsockopt(sock, level,
 397                                         optname, optval, optlen);
 398                 else if (sock->ops->compat_setsockopt)
 399                         err = sock->ops->compat_setsockopt(sock, level,
 400                                         optname, optval, optlen);
 401                 else
 402                         err = sock->ops->setsockopt(sock, level,
 403                                         optname, optval, optlen);
 404                 sockfd_put(sock);
 405         }
 406         return err;
 407 }
 408
 409 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 410                 char __user *optval, int __user *optlen)
 411 {
 412         struct compat_timeval __user *up;
 413         struct timeval ktime;
 414         mm_segment_t old_fs;
 415         int len, err;
 416
 417         up = (struct compat_timeval __user *) optval;
 418         if (get_user(len, optlen))
 419                 return -EFAULT;
 420         if (len < sizeof(*up))
 421                 return -EINVAL;
 422         len = sizeof(ktime);
 423         old_fs = get_fs();
 424         set_fs(KERNEL_DS);
 425         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 426         set_fs(old_fs);
 427
 428         if (!err) {
 429                 if (put_user(sizeof(*up), optlen) ||
 430                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 431                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 432                     __put_user(ktime.tv_usec, &up->tv_usec))
 433                         err = -EFAULT;
 434         }
 435         return err;
 436 }
 437
 438 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 439                                 char __user *optval, int __user *optlen)
 440 {
 441         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 442                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 443         return sock_getsockopt(sock, level, optname, optval, optlen);
 444 }
 445
 446 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 447 {
 448         struct compat_timeval __user *ctv;
 449         int err;
 450         struct timeval tv;
 451
 452         if (COMPAT_USE_64BIT_TIME)
 453                 return sock_get_timestamp(sk, userstamp);
 454
 455         ctv = (struct compat_timeval __user *) userstamp;
 456         err = -ENOENT;
 457         if (!sock_flag(sk, SOCK_TIMESTAMP))
 458                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 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         int err;
 478         struct timespec ts;
 479
 480         if (COMPAT_USE_64BIT_TIME)
 481                 return sock_get_timestampns (sk, userstamp);
 482
 483         ctv = (struct compat_timespec __user *) userstamp;
 484         err = -ENOENT;
 485         if (!sock_flag(sk, SOCK_TIMESTAMP))
 486                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 487         ts = ktime_to_timespec(sk->sk_stamp);
 488         if (ts.tv_sec == -1)
 489                 return err;
 490         if (ts.tv_sec == 0) {
 491                 sk->sk_stamp = ktime_get_real();
 492                 ts = ktime_to_timespec(sk->sk_stamp);
 493         }
 494         err = 0;
 495         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 496                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 497                 err = -EFAULT;
 498         return err;
 499 }
 500 EXPORT_SYMBOL(compat_sock_get_timestampns);
 501
 502 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 503                        char __user *, optval, int __user *, optlen)
 504 {
 505         int err;
 506         struct socket *sock = sockfd_lookup(fd, &err);
 507
 508         if (sock) {
 509                 err = security_socket_getsockopt(sock, level, optname);
 510                 if (err) {
 511                         sockfd_put(sock);
 512                         return err;
 513                 }
 514
 515                 if (level == SOL_SOCKET)
 516                         err = compat_sock_getsockopt(sock, level,
 517                                         optname, optval, optlen);
 518                 else if (sock->ops->compat_getsockopt)
 519                         err = sock->ops->compat_getsockopt(sock, level,
 520                                         optname, optval, optlen);
 521                 else
 522                         err = sock->ops->getsockopt(sock, level,
 523                                         optname, optval, optlen);
 524                 sockfd_put(sock);
 525         }
 526         return err;
 527 }
 528
 529 struct compat_group_req {
 530         __u32                            gr_interface;
 531         struct __kernel_sockaddr_storage gr_group
 532                 __aligned(4);
 533 } __packed;
 534
 535 struct compat_group_source_req {
 536         __u32                            gsr_interface;
 537         struct __kernel_sockaddr_storage gsr_group
 538                 __aligned(4);
 539         struct __kernel_sockaddr_storage gsr_source
 540                 __aligned(4);
 541 } __packed;
 542
 543 struct compat_group_filter {
 544         __u32                            gf_interface;
 545         struct __kernel_sockaddr_storage gf_group
 546                 __aligned(4);
 547         __u32                            gf_fmode;
 548         __u32                            gf_numsrc;
 549         struct __kernel_sockaddr_storage gf_slist[1]
 550                 __aligned(4);
 551 } __packed;
 552
 553 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 554                         sizeof(struct __kernel_sockaddr_storage))
 555
 556
 557 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 558         char __user *optval, unsigned int optlen,
 559         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 560 {
 561         char __user     *koptval = optval;
 562         int             koptlen = optlen;
 563
 564         switch (optname) {
 565         case MCAST_JOIN_GROUP:
 566         case MCAST_LEAVE_GROUP:
 567         {
 568                 struct compat_group_req __user *gr32 = (void *)optval;
 569                 struct group_req __user *kgr =
 570                         compat_alloc_user_space(sizeof(struct group_req));
 571                 u32 interface;
 572
 573                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 574                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 575                     __get_user(interface, &gr32->gr_interface) ||
 576                     __put_user(interface, &kgr->gr_interface) ||
 577                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 578                                 sizeof(kgr->gr_group)))
 579                         return -EFAULT;
 580                 koptval = (char __user *)kgr;
 581                 koptlen = sizeof(struct group_req);
 582                 break;
 583         }
 584         case MCAST_JOIN_SOURCE_GROUP:
 585         case MCAST_LEAVE_SOURCE_GROUP:
 586         case MCAST_BLOCK_SOURCE:
 587         case MCAST_UNBLOCK_SOURCE:
 588         {
 589                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 590                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 591                         sizeof(struct group_source_req));
 592                 u32 interface;
 593
 594                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 595                     !access_ok(VERIFY_WRITE, kgsr,
 596                         sizeof(struct group_source_req)) ||
 597                     __get_user(interface, &gsr32->gsr_interface) ||
 598                     __put_user(interface, &kgsr->gsr_interface) ||
 599                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 600                                 sizeof(kgsr->gsr_group)) ||
 601                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 602                                 sizeof(kgsr->gsr_source)))
 603                         return -EFAULT;
 604                 koptval = (char __user *)kgsr;
 605                 koptlen = sizeof(struct group_source_req);
 606                 break;
 607         }
 608         case MCAST_MSFILTER:
 609         {
 610                 struct compat_group_filter __user *gf32 = (void *)optval;
 611                 struct group_filter __user *kgf;
 612                 u32 interface, fmode, numsrc;
 613
 614                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 615                     __get_user(interface, &gf32->gf_interface) ||
 616                     __get_user(fmode, &gf32->gf_fmode) ||
 617                     __get_user(numsrc, &gf32->gf_numsrc))
 618                         return -EFAULT;
 619                 koptlen = optlen + sizeof(struct group_filter) -
 620                                 sizeof(struct compat_group_filter);
 621                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 622                         return -EINVAL;
 623                 kgf = compat_alloc_user_space(koptlen);
 624                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 625                     __put_user(interface, &kgf->gf_interface) ||
 626                     __put_user(fmode, &kgf->gf_fmode) ||
 627                     __put_user(numsrc, &kgf->gf_numsrc) ||
 628                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 629                                 sizeof(kgf->gf_group)) ||
 630                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 631                                 numsrc * sizeof(kgf->gf_slist[0]))))
 632                         return -EFAULT;
 633                 koptval = (char __user *)kgf;
 634                 break;
 635         }
 636
 637         default:
 638                 break;
 639         }
 640         return setsockopt(sock, level, optname, koptval, koptlen);
 641 }
 642 EXPORT_SYMBOL(compat_mc_setsockopt);
 643
 644 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 645         char __user *optval, int __user *optlen,
 646         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 647 {
 648         struct compat_group_filter __user *gf32 = (void *)optval;
 649         struct group_filter __user *kgf;
 650         int __user      *koptlen;
 651         u32 interface, fmode, numsrc;
 652         int klen, ulen, err;
 653
 654         if (optname != MCAST_MSFILTER)
 655                 return getsockopt(sock, level, optname, optval, optlen);
 656
 657         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 658         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 659             __get_user(ulen, optlen))
 660                 return -EFAULT;
 661
 662         /* adjust len for pad */
 663         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 664
 665         if (klen < GROUP_FILTER_SIZE(0))
 666                 return -EINVAL;
 667
 668         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 669             __put_user(klen, koptlen))
 670                 return -EFAULT;
 671
 672         /* have to allow space for previous compat_alloc_user_space, too */
 673         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 674
 675         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 676             __get_user(interface, &gf32->gf_interface) ||
 677             __get_user(fmode, &gf32->gf_fmode) ||
 678             __get_user(numsrc, &gf32->gf_numsrc) ||
 679             __put_user(interface, &kgf->gf_interface) ||
 680             __put_user(fmode, &kgf->gf_fmode) ||
 681             __put_user(numsrc, &kgf->gf_numsrc) ||
 682             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 683                 return -EFAULT;
 684
 685         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 686         if (err)
 687                 return err;
 688
 689         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 690             __get_user(klen, koptlen))
 691                 return -EFAULT;
 692
 693         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 694
 695         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 696             __put_user(ulen, optlen))
 697                 return -EFAULT;
 698
 699         if (!access_ok(VERIFY_READ, kgf, klen) ||
 700             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 701             __get_user(interface, &kgf->gf_interface) ||
 702             __get_user(fmode, &kgf->gf_fmode) ||
 703             __get_user(numsrc, &kgf->gf_numsrc) ||
 704             __put_user(interface, &gf32->gf_interface) ||
 705             __put_user(fmode, &gf32->gf_fmode) ||
 706             __put_user(numsrc, &gf32->gf_numsrc))
 707                 return -EFAULT;
 708         if (numsrc) {
 709                 int copylen;
 710
 711                 klen -= GROUP_FILTER_SIZE(0);
 712                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 713                 if (copylen > klen)
 714                         copylen = klen;
 715                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 716                         return -EFAULT;
 717         }
 718         return err;
 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[21] = {
 726         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 727         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 728         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 729         AL(4), AL(5), AL(4)
 730 };
 731 #undef AL
 732
 733 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 734 {
 735         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 736 }
 737
 738 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 739                        unsigned int, vlen, unsigned int, flags)
 740 {
 741         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 742                               flags | MSG_CMSG_COMPAT);
 743 }
 744
 745 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 746 {
 747         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 748 }
 749
 750 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 751 {
 752         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 753 }
 754
 755 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 756                        unsigned int, flags, struct sockaddr __user *, addr,
 757                        int __user *, addrlen)
 758 {
 759         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 760 }
 761
 762 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 763                        unsigned int, vlen, unsigned int, flags,
 764                        struct compat_timespec __user *, timeout)
 765 {
 766         int datagrams;
 767         struct timespec ktspec;
 768
 769         if (timeout == NULL)
 770                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 771                                       flags | MSG_CMSG_COMPAT, NULL);
 772
 773         if (compat_get_timespec(&ktspec, timeout))
 774                 return -EFAULT;
 775
 776         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 777                                    flags | MSG_CMSG_COMPAT, &ktspec);
 778         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 779                 datagrams = -EFAULT;
 780
 781         return datagrams;
 782 }
 783
 784 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 785 {
 786         u32 a[AUDITSC_ARGS];
 787         unsigned int len;
 788         u32 a0, a1;
 789         int ret;
 790
 791         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 792                 return -EINVAL;
 793         len = nas[call];
 794         if (len > sizeof(a))
 795                 return -EINVAL;
 796
 797         if (copy_from_user(a, args, len))
 798                 return -EFAULT;
 799
 800         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 801         if (ret)
 802                 return ret;
 803
 804         a0 = a[0];
 805         a1 = a[1];
 806
 807         switch (call) {
 808         case SYS_SOCKET:
 809                 ret = sys_socket(a0, a1, a[2]);
 810                 break;
 811         case SYS_BIND:
 812                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 813                 break;
 814         case SYS_CONNECT:
 815                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 816                 break;
 817         case SYS_LISTEN:
 818                 ret = sys_listen(a0, a1);
 819                 break;
 820         case SYS_ACCEPT:
 821                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 822                 break;
 823         case SYS_GETSOCKNAME:
 824                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 825                 break;
 826         case SYS_GETPEERNAME:
 827                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 828                 break;
 829         case SYS_SOCKETPAIR:
 830                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 831                 break;
 832         case SYS_SEND:
 833                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 834                 break;
 835         case SYS_SENDTO:
 836                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 837                 break;
 838         case SYS_RECV:
 839                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 840                 break;
 841         case SYS_RECVFROM:
 842                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 843                                           compat_ptr(a[4]), compat_ptr(a[5]));
 844                 break;
 845         case SYS_SHUTDOWN:
 846                 ret = sys_shutdown(a0, a1);
 847                 break;
 848         case SYS_SETSOCKOPT:
 849                 ret = compat_sys_setsockopt(a0, a1, a[2],
 850                                 compat_ptr(a[3]), a[4]);
 851                 break;
 852         case SYS_GETSOCKOPT:
 853                 ret = compat_sys_getsockopt(a0, a1, a[2],
 854                                 compat_ptr(a[3]), compat_ptr(a[4]));
 855                 break;
 856         case SYS_SENDMSG:
 857                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 858                 break;
 859         case SYS_SENDMMSG:
 860                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 861                 break;
 862         case SYS_RECVMSG:
 863                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 864                 break;
 865         case SYS_RECVMMSG:
 866                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 867                                           compat_ptr(a[4]));
 868                 break;
 869         case SYS_ACCEPT4:
 870                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 871                 break;
 872         default:
 873                 ret = -EINVAL;
 874                 break;
 875         }
 876         return ret;
 877 }